EP2926949A2 - Refroidissement à air de meules et plateaux de rectifieuses à ressort (système à 3 chambres) - Google Patents

Refroidissement à air de meules et plateaux de rectifieuses à ressort (système à 3 chambres) Download PDF

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Publication number
EP2926949A2
EP2926949A2 EP15162107.5A EP15162107A EP2926949A2 EP 2926949 A2 EP2926949 A2 EP 2926949A2 EP 15162107 A EP15162107 A EP 15162107A EP 2926949 A2 EP2926949 A2 EP 2926949A2
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EP
European Patent Office
Prior art keywords
grinding
loading plate
chamber
door
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15162107.5A
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German (de)
English (en)
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EP2926949B1 (fr
EP2926949A3 (fr
Inventor
Gabriella Kunz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Officina Meccanica Domaso SpA
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Officina Meccanica Domaso SpA
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Publication of EP2926949A3 publication Critical patent/EP2926949A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/167—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings end faces coil springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0069—Other grinding machines or devices with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/005—Feeding or manipulating devices specially adapted to grinding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/045—Protective covers for the grinding wheel with cooling means incorporated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Definitions

  • the invention relates to a grinding machine according to claim 1 and a method for operating a grinding machine according to claim 14.
  • Grinders are used in many manufacturing processes in the industry where surfaces of workpieces are machined. Usually surfaces of predominantly metallic machine elements with certain accuracy requirements are to be produced. In this case, a good utilization of the grinding machine and short machining cycles are economically important especially for machine elements that are produced in large quantities.
  • grinding dust is generated which contains particles of the removed material and of the abrasive used.
  • the grinding dust partially deposits in or on the grinding machine.
  • the friction work done between the surface of the workpiece and the abrasive article creates heat that can result in heating of the workpiece and abrasive article beyond a material critical temperature. This can cause thermal damage to the workpiece. Besides, it can when grinding to flying sparks, the emergence of harmful vapors and noise development come.
  • grinding wheels with hard abrasives of different coarse grain size are frequently used, which can be operated at high rotational speeds and have a high thermal resistance.
  • cooling fluids for example air, water, oil or suitable cooling lubricants
  • the service life of grinding wheels can be considerably extended.
  • the grinding zone is often easily accessible and the supply of the cooling fluid can be easily realized technically, for example by injection or injection via cooling nozzles.
  • the cooling proves to be more technically complicated if the grinding surface is the base of the cylindrically shaped grinding wheel. It is known for grinding wheel cooling cavities, such as cooling air channels to provide in the grinding wheels, or to supply cooling fluids due to the porosity of the abrasive sliding material of the grinding surface. These measures require the use of expensive and specially designed grinding wheels, grinding wheel holders and grinding spindles with feeds for the cooling fluid.
  • grinders which are equipped with two movable loading devices for workpieces, one of which is in a grinding position for carrying out the grinding process, while the other is for loading or unloading in a loading position, so that after completion of the grinding process, the chargers without Time loss can be moved to the other position, there to carry out the next manufacturing step.
  • occupational safety plays an important role, because it must be ensured that the grinding space around the grinding zone is secured during grinding due to the rotating grinding wheels, the grinding dust development of the spark, while the loading space must be accessible to the loading device with workpieces loaded or to unload the workpieces.
  • grinding dust can spread unhindered into the hold, there deposit and lead, especially when deposited on the moving parts of the grinding machine, to functional impairment of the machine.
  • the patent application DE 102012201465 A1 generally mentions the possibility of blowing fresh air into the grinding space of a spring-end grinding machine or into the Schaub compression springs.
  • a vertically movable shield which is moved before the start of the grinding operation down until its lower edge is located at a small distance above the recorded in the loading plate helical compression springs.
  • a thermal imaging camera which is attached to the side facing away from the grinding wheels of the shield.
  • the previously known solution aims in this respect to be able to do without expensive cooling measures by temperature monitoring and a temperature-dependent control of the grinding process.
  • the well-known shield can protect the exposed part of the loading plate only against such sparks that arise when grinding the upper ends of the coil springs above the loading plate, but not in front of sparks, which arise below the loading plate.
  • the present invention therefore has the object, a grinding machine and a method for operating a grinding machine with increased productivity, Provide occupational safety and energy efficiency.
  • the design and equipment of the grinding machine is to be improved in view of the spread of grinding dust and exhaust air of the grinding process and the cooling of the workpieces and / or the loading plate in terms of effectiveness and energy efficiency can be improved.
  • loading plates there may be a plurality of loading plates, in particular three or four loading plates, but preferably two loading plates, which are preferably provided may be arranged uniformly over the circumference of the turntable and further preferably at the same radial distance from the axis of rotation of the turntable.
  • loading plates allow several steps of the machining process to be carried out simultaneously on the grinding machine to increase the productivity of the machine.
  • the loading plate can be designed exchangeable and / or height-adjustable, for example, by an axially displaceable along its axis of rotation storage on a loading plate shaft, preferably with a tongue and groove connection. It may be provided a double or multi-level loading plate.
  • the loading plate is circular cylindrical and / or infinitely rotatable, in particular cyclically or continuously rotatable about its axis of rotation, where it can be rotated for example by a servo motor via a loading plate shaft.
  • the loading of the loading plate with workpieces can be made manually or mechanically, with the term "assembly" loading or loading of objects to be ground on or in the loading plate, and optionally their loose or fixed fixation on or in the loading plate, for example in intended receiving openings, holding or clamping devices, can be understood.
  • a plurality of workpiece receiving devices may be provided.
  • the workpieces can have any desired shape and materials, but the grinding machine according to the invention is particularly well suited for grinding springs, preferably helical springs, more preferably helical compression springs, in particular for use as a spring-end grinding machine.
  • Helical compression springs can be made of wound or wound wire, preferably of metallic materials. Helical compression springs may for example be cylindrical, conical or double conical and have different diameters and / or lengths.
  • a "loading position” can be understood as meaning a position of the axis of rotation of the loading plate relative to the grinding machine, in which the loading plate with workpieces can be fitted, or workpieces can be removed from or removed from the loading plate or taken from him.
  • a “grinding position” can be understood as meaning a position of the axis of rotation of the loading plate relative to the grinding machine, in which loading plate is positioned relative to the grinding unit such that at least one optionally loaded workpiece can come into sliding contact with the at least one grinding wheel. If the loading plate is in a grinding position, so a workpiece can be ground. Preferably, exactly one loading position and exactly one grinding position are diametrically opposed and provided at the same radial distance from the axis of rotation of the turntable.
  • a loading and grinding position of the loading plate is defined by the position of the axis of rotation relative to the grinding machine. The loading plate could be rotated in a loading position and / or grinding position about its own axis of rotation.
  • the rotation of the turntable can be implemented, for example, by a servomotor.
  • the movement of a loading plate for example, be realized by the turntable is always rotated by half a turn, ie by 180 °, when the loading plate to change its position from the grinding to the loading position, or vice versa.
  • other rotational intervals may be provided, for example 120 ° or 90 °. It would also be possible to reverse the direction of rotation of the turntable between a positional movement of the loading plate.
  • the rotation of the turntable and an optionally superimposed rotation of the loading plate about its own axis of rotation results in a movement path of the loading plate.
  • the peripheral contour of the loading plate describes a, preferably circular, outer web of the loading plate, which results from the distance of the axis of rotation of the loading plate of the axis of rotation of the turntable and the radius of the, preferably circular, loading plate.
  • the axis of rotation of the at least one grinding wheel can also be made slightly tilted relative to the axis of rotation of the loading plate, for example in order to adjust the grinding removal during operation of the grinding machine in the continuous grinding process.
  • The, preferably circular cylindrical, rotatable grinding wheel can, for example via a driven grinding spindle, in rotation about their Be rotated axis.
  • a grinding wheel cooling may be provided, which may for example be integrated into the grinding wheel, preferably as a centrifugal cooling system, or the grinding unit.
  • the grinding unit comprises two rotatably mounted grinding wheels, which simultaneously grind workpieces with a part of their base plate facing the loading plate when the loading plate is in a grinding position.
  • a double-sided surface grinding process for helical compression springs can be performed with the grinding machine, which is often used for plane-parallel grinding of spring ends of helical compression springs.
  • the at least one grinding wheel is displaceably mounted along its axis of rotation, in particular variably adjustable in its axial distance from a loading plate, in particular automatically deliverable.
  • a loading plate in particular automatically deliverable.
  • workpieces of different lengths in particular helical compression springs, can be ground in the grinding machine.
  • the intended removal on a workpiece by delivery of the grinding wheels, in particular during the grinding process, in particular via the adjustment of the grinding pressure when grinding springs can be adjusted.
  • sliding contact can be understood as meaning a contact of the surface of the workpiece to be ground with a grinding surface of the grinding wheel.
  • grinding pressure which determines the abrasion during the grinding process, and thus the formation of grinding dust and frictional heat.
  • Other important parameters are, for example, the rotational speed and direction of the loading plate and the at least one grinding wheel, the material combination material grinding wheel, as well as the use of cooling lubricants and the intended cooling of the workpieces and / or the grinding wheel.
  • grinding zone can be understood as meaning the spatial area in which a sliding contact is established. ⁇ br/> ⁇ br/>
  • the grinding zone is at a radial overlapping area of the at least one, preferably circular-cylindrical, grinding wheel with a preferably circular-cylindrical loading plate which is in a grinding position.
  • the grinding zone extends between a base surface facing the loading plate of the at least one grinding wheel, which acts as a grinding surface, and a base surface of a loading plate at least one workpiece and a grinding surface of the at least one grinding wheel to be understood.
  • the grinding zone can also be understood as a three-dimensional area in which it comes to grinding contact during the grinding process.
  • the grinding zone may comprise the spatial area in which, during grinding, development of grinding dust and / or exhaust air and / or noise and / or heat and / or sparking due to sliding contact may occur.
  • the grinding zone comprises two separate grinding zones, ie is in particular divided into two parts, namely into an upper grinding zone, which lies above the loading plate, and a lower grinding zone, which lies below the loading plate.
  • the upper spring ends and in the lower grinding zone the lower workpiece ends, in particular spring ends, ground.
  • inside and outside may be understood in reference to the grinding zone.
  • inside can be understood as “closer to the grinding zone or to the grinding zone”
  • outside can be understood as “further away from the grinding zone”.
  • the inner chamber is closer to the grinding zone than the intermediate chamber, and in turn closer to the grinding zone than the outer chamber.
  • a workpiece, with which the loading plate is equipped in particular passes through the outer chamber and then the intermediate chamber during the movement of the loading plate from a loading position into a grinding position, in order finally to be ground in the inner chamber. After grinding, the chambers are preferably run in reverse order.
  • top and bottom can be understood to mean the position relative to the loading plate in the direction of the axis of rotation of the loading plate. The turntable is therefore below the loading plate.
  • the grinding chamber encloses the grinding zone, whereby the grinding chamber does not have to be completely spatially closed to the outside or the grinding zone does not have to be completely sealed, in particular air-tight or sound-proof.
  • the grinding chamber in particular represents an at least largely closable space which is not specified geometrically, but is preferably designed so that the grinding zone is located completely within the grinding chamber.
  • the grinding chamber is subdivided by the shielding device into an inner chamber and an intermediate chamber, wherein the intermediate chamber preferably extends on the side of the shielding device facing away from the grinding zone. Especially lie the intermediate chamber and the inner chamber so within the grinding chamber or form this together.
  • the inner chamber is preferably formed largely by a housing part of the grinding machine, which receives the grinding unit, and in particular open to the loading plate, this opening is preferably limited by the shielding device, which is preferably mounted on a front plate of the grinding machine, and up to an inlet gap for the loading plate and recorded therein workpieces is closed.
  • the shielding device is designed in particular as a vertically movable grinding chamber shield whose shape is adapted in particular to the peripheral contour of the grinding wheels.
  • the shielding device can be delivered from above to the upper edge of the workpieces or the top of the loading plate.
  • the shielding device can be fastened to a height-adjustable front plate of the grinding machine, in turn in turn adjustable in height, and have inlet devices, preferably in the form of beveled inlet plates, for facilitating the retraction of workpieces into the inner chamber.
  • the shielding device shields, in particular during the grinding process, the intermediate chamber from sparking and grinding dust which arises in the grinding zone, preferably in the upper grinding zone.
  • the shielding device does not necessarily close the inner chamber to the outside, in particular to the intermediate chamber, from. It may also gaps or passages between the intermediate chamber and the inner chamber, in particular on the underside of the inner chamber and / or the sides of the shielding remain.
  • the inner chamber does not enclose the lower grinding zone, but is preferably delimited downwardly by a portion of the upper surface of the loading plate located on the side of the shielding device facing the upper grinding wheel.
  • the shielding device can be moved upwards after the grinding process or for setting up the grinding machine, for example for changing the grinding wheels, so that the inner chamber is accessible from the intermediate chamber.
  • the shielding device could in principle also be laterally displaceable or pivotable or foldable, in particular also in several parts.
  • the outer chamber encloses the intermediate chamber at least partially, wherein the outer chamber - neither towards the outside environment, nor to the intermediate chamber - not completely closed, in particular air-dust or soundproof more airtight, space must be.
  • the outer chamber may also adjoin the inner chamber.
  • the closed intermediate door does not have to completely separate the two chambers, in the sense that there is no structural connection between the two chambers at all.
  • two outer chambers may be provided, wherein sections of boundary wall elements of an outer, intermediate and inner chamber may coincide.
  • the at least one outer chamber, the intermediate chamber and the inner chamber can be arranged nested one inside the other.
  • the intermediate door in a closed state separates the outer chamber from the intermediate chamber and in particular also from the inner chamber with the enclosed grinding zone or from the grinding chamber comprising the inner chamber and the intermediate chamber, preferably also when the shielding device is open.
  • the separation is to be understood in the sense mentioned above, that at least in functional terms, the grinding chamber, in particular the inner chamber and the intermediate chamber is separated from the outer chamber with respect to the objectives of occupational safety and / or limitation of the cooling air flow and / or grinding dust spread without that a complete separation must be given. For example, there might well be narrow gaps or indirect winding passages between the chambers, or in the vicinity of the grinder.
  • Boundary surfaces of the outer, intermediate, and / or inner chamber may be arranged so that in the closed state of the at least one intermediate door and / or the shielding substantially no sanding dust and / or no exhaust air and / or sparks, at most only a little grinding dust and / or exhaust air and / or a few sparks, from the inner chamber or the intermediate chamber to the outside, in particular in the outer chamber, can penetrate.
  • the spatial boundary of the outer, intermediate, and / or inner chamber may be given by surfaces of various components of the grinding machine.
  • Such a grinding machine has the advantage that by a structure of the grinding machine with three chambers, namely an inner chamber, an intermediate chamber and at least one outer chamber, the spread of Abrasive dust and / or exhaust air and / or sparks and / or heat and / or noise spatially, in particular in a chamber graduated extent, preferably from the inside to the outside, namely substantially to the area within the inner chamber and the intermediate chamber, limited or at least can be reduced ,
  • the spread of grinding dust and / or exhaust air and / or sparks from the upper grinding zone, with the shielding device closed is essentially limited to the inner chamber and from the lower grinding zone substantially to the intermediate chamber.
  • an intermediate chamber moreover, the cooling of the workpieces and / or the loading plate can be improved, for example by effectively supplying cooling air to the workpieces or the loading plate in the intermediate chamber.
  • the air flow within the outer chambers and the intermediate chamber can be optimized so that sanding dust and exhaust air are better discharged from the grinding zone or carried away.
  • cooling devices in the intermediate chamber can be targeted to the grinding zone or the loading plate and the total volume flow of cooling fluid thereby reduced. This can contribute to better productivity and higher energy efficiency of the grinding machine.
  • the safety is further increased, because on the one hand less dust and / or exhaust and / or sparks can penetrate through a plurality of chambers to an operator of the machine to the outside, and on the other may not dangerous, rotating parts such as loading plates and grinding wheels not free are accessible when at least one of the three chambers is closed.
  • the at least one intermediate door is pivotable, wherein the pivot axis is preferably parallel to the axis of rotation of the turntable.
  • the pivot axis could also be aligned differently, for example, perpendicular to the axis of rotation of the turntable.
  • the intermediate door could, for example, be pivotable around the upper edge of the door as a hinged door or, for example, about a pivot point, in particular a lower or upper door corner.
  • the intermediate door has a door lower edge, which flush with lower boundary surfaces of the intermediate chamber, and / or a Schoundary surfaces of the intermediate chamber flush.
  • a narrow gap between the boundary surfaces and the door edges could remain, for example, to prevent jamming of the intermediate door during its pivoting.
  • a swiveling intermediate door does not block the movement of the loading plate in the opened state of the intermediate door, so that the loading plate can be moved through the door opening.
  • two pivotable intermediate doors are provided, which are preferably arranged symmetrically to a center plane of the grinding machine.
  • the flush results in a seal between the outer chamber and the intermediate chamber, which could be further improved for example by the attachment of sealing lips along the lower door edge and / or TÜberberkante.
  • An embodiment as a pivotable intermediate door has the advantage that the structural implementation is simple and that, especially if the pivot axis is parallel to the axis of rotation of the turntable, a low overall height of the grinding machine is possible.
  • a lower door edge of the intermediate door extends below the upper side of the loading plate, in particular below the loading plate.
  • a lower door edge of the intermediate door is flush with a surface of the turntable and / or a table top.
  • a lower boundary surface of the intermediate chamber in particular at least part of the lower boundary surface, is formed by a surface of the turntable.
  • a narrow gap between the surface of the turntable and the lower door edge remain, so that the intermediate door, preferably pivotable, is movable and the intermediate chamber is substantially sealed, but not necessarily completely sealed, relative to the turntable.
  • At the door lower edge may be provided a sealing lip or other mobility-maintaining sealing device.
  • the inner door surface of the intermediate door overlaps in projection with the side surface of the loading plate, extends over the entire height of the loading plate or extends beyond it, in particular to the lower workpiece ends, which preferably rest on the turntable.
  • An intermediate door which extends to below the top of the loading plate, has the advantage that the upper Abrasive zone can be shielded laterally over its entire height, even a possibly remaining between the lower edge of the shielding and the top of the loading plate gap.
  • An intermediate door, which extends to the surface of the turntable has the advantage that the lower grinding zone, in particular substantially over its entire height, can be shielded laterally.
  • a grinding chamber of which an intermediate chamber is delimited by such an intermediate door, encloses the loading plate, the workpieces accommodated therein and the grinding zone, essentially over the entire height, ie the upper and lower grinding zone, in particular from the sides.
  • the spread of grinding dust and / or exhaust air and / or sparks and / or heat and / or noise which arise in the grinding zone, in particular also in the lower grinding zone can be spatially limited or at least reduced to the intermediate chamber when the intermediate door is closed. especially with respect to the outer chamber.
  • the intermediate chamber Whilst grinding dust and / or exhaust air and / or sparks and / or heat and / or noise arising in the upper grinding zone are prevented from spreading mainly by the inner chamber, in particular by the closed shielding device, the intermediate chamber, with its closed intermediate doors, provides , in particular with regard to the lower grinding zone, an additional sealing effect with respect to the outer chamber and the surroundings of the grinding machine.
  • lateral boundary surfaces of the intermediate chamber are formed by inner door surfaces of two intermediate doors, which in the closed state adjoin one another or flush with further boundary wall elements of the intermediate chamber, in particular on side surfaces of rotary wall elements fixedly mounted on the turntable relative to the turntable. It would be conceivable that door side edges, which run parallel to the pivot axis, preferably without further boundary wall elements between, flush with each other. This would allow, for example, a tight enclosure of the loading plate through the door inner surfaces. By flushing a seal between the outer chamber and the intermediate chamber can be achieved, which could be further improved, for example, by the attachment of sealing lips along the door side edges.
  • lateral boundary surfaces may be formed by side surfaces of first rotary wall elements oriented in the circumferential direction of the rotary table, second rotary wall elements aligned in the radial direction of the rotary table and / or rotary wall elements adapted to the peripheral contour of the loading plate.
  • the second Turning wall elements could be designed as radially movable sliding doors. Turning wall elements may have viewing windows.
  • the structural design of the intermediate chamber with rotary wall elements has the advantage that these wall elements do not have to be moved separately, for example by separate drives, when the loading plate is moved. A collision with the loading plate can be precluded in this way already constructive. This makes the structure of the grinding machine and its control easier and cheaper.
  • the second rotary wall elements as a sliding door, the intermediate chamber could be made accessible from the front, for example, to change grinding wheels, adjust, or to make other maintenance work within the intermediate chamber or the inner chamber.
  • the at least one outer chamber has a door leaf space into which the door leaf of a pivotable intermediate door can pivot in the open state.
  • Such door leaf spaces could be designed, for example, as a circular segment-shaped bulges of an outer chamber.
  • the outer chamber can be designed as an at least laterally closed space, which is substantially tight even with open intermediate doors and offers increased safety.
  • a higher productivity of the grinding machine can be achieved by the mobility of the loading plate, in particular of two loading plates.
  • the at least one intermediate door has a first cooling device, for example for cooling workpieces and / or the loading plate.
  • the first cooling device may be integrated in the intermediate door or attached to the intermediate door.
  • the first cooling device is closer to the grinding zone or the inner chamber in the closed state of the intermediate door than in the open state.
  • the first cooling device has at least one outflow opening for a cooling fluid, preferably cooling air, which is aligned in particular in the direction of the grinding zone, preferably approximately at the level of the lower grinding zone, more preferably at or along the lower door edge of the intermediate door , in particular as a ventilation slot along the inner door lower edge is formed.
  • the outflow opening is preferably aligned in the direction of the grinding zone.
  • air cooling is technically easy to implement because the cooling fluid does not have to be collected. It is in principle but also a water cooling, or oil cooling conceivable.
  • cooling fluid can flow to the points at which the heat during the Grinding process is created, in particular to the lower workpiece ends, in particular spring ends.
  • the outflow opening on or along the door lower edge in particular as an elongated ventilation slot, a distribution of the cooling fluid over a certain width can be achieved, whereby a larger area within the intermediate chamber, can be cooled, for example, the underside of the loading plate.
  • the cooling fluid could be particularly well blown into the narrow grinding zone, preferably lower grinding zone, to cool the workpieces that are in it or have just exited the, preferably lower, grinding zone.
  • a ventilation slot at the level of the lower edge of the door would be particularly advantageous in order to blow in cooling air into the grinding zone between the lower side of the loading plate and the upper side of the lower grinding wheel using two grinding wheels. In this way, the workpieces could be cooled on their underside.
  • the first cooling device has an inflow opening for a cooling fluid, preferably cooling air, which coincides in the closed state of the intermediate door with a supply opening for the cooling fluid, which is formed in an upper or lower boundary surface of the intermediate chamber.
  • a cooling fluid preferably cooling air
  • the inflow opening is formed flush with the upper edge of the door of the intermediate door.
  • the inflow opening could thus be formed with its peripheral contour substantially in a plane with the Matoberseite.
  • "coincide” can be understood as meaning that the supply opening coincides with the inflow opening in the closed state of the intermediate door.
  • the first cooling device could thus be designed so that when the intermediate door is closed, the inflow opening substantially, that is, for example, just directly above or below, the feed opening comes to rest, the inlet opening and the feed opening could close substantially tightly together.
  • Any shapes of the two openings would be conceivable, for example circular openings of identical diameter.
  • the outflow opening is connected to the inflow opening via a pipe section integrated in the intermediate door, in particular a pipe running parallel to the pivot axis of the intermediate door.
  • the conduit section could be located within the intermediate door, on one of the outsides of the door leaves or edges, in particular along the door leading edge, along the pivot axis, or, for example, in sections, at a distance from the intermediate door, run.
  • the line section could be made in one piece with the intermediate door, or be attached as a separate element to the intermediate door. In this case, the line section does not have to run exclusively vertically or straight, but may also be oblique or curved.
  • the line section is designed as a circular tube, but could for example be provided as a hose or a channel, or with other cross sections, in particular variable cross sections.
  • the cooling fluid can be directed from the inflow opening to the outflow opening, from where it can flow, for example via a distribution channel, preferably as targeted as possible, for example in the direction of the workpieces, the grinding zone, preferably the lower grinding zone, or the loading plate.
  • lateral boundary surfaces of the intermediate chamber are adapted to the peripheral contour of the loading plate when it is in a grinding position.
  • the loading plate can be enclosed by the intermediate chamber as closely as possible.
  • a cooling fluid in particular cooling air, can be directed or circulated in a particularly targeted and effective manner for cooling the loading plate and / or the workpieces received therein within the intermediate chamber.
  • the at least one outflow opening of the first cooling device can thereby be positioned as close as possible to the loading plate, in particular with only a small clearance gap to the side surface of the loading plate along the circumferential direction of the loading plate, so that a lossless as possible injection of cooling air into the space between the bottom of the loading plate and the top of the turntable is made possible.
  • the lower workpiece ends in particular spring ends, are effectively cooled. In this way, cooling air can in particular also penetrate into or be directed into the lower grinding zone.
  • the at least one intermediate door has a door leaf, which is curved towards the grinding zone and / or has a bend in the direction perpendicular to the pivot axis.
  • a distance between the grinding zone, in particular the lower grinding zone, and the inner chamber and the inner door surface of the intermediate door as low as possible.
  • the outflow opening for example, as well as possible cling to the peripheral contour of the loading plate while the pivot axis is still outside the range of movement of the loading plate.
  • the advantage of these measures is that the cooling performance of the cooling device of the intermediate door can be further improved.
  • the grinding machine comprises a housing on which at least one second cooling device with a discharge device for a cooling fluid is mounted, wherein the position of the discharge device in the direction of the axis of rotation of the loading plate is variable by means of a height adjustment.
  • the housing could be connected to the part of the grinding machine in which the turntable is mounted, for example a machine foundation or foot, or be designed as a separate component of the grinding machine.
  • the housing could surround the grinding unit, or the grinding unit could be mounted in the housing.
  • the term "height" can be understood as the direction of the axis of rotation of the loading plate. Accordingly, upper and lower positions result in the height direction.
  • the height adjustment direction is designed to change the height of the second cooling device, in particular to adjust.
  • the advantage of such a grinding machine is that due to the variable height of the outflow device, in particular its height adjustability, the cooling can be adapted to the respective configuration of the grinding machine.
  • the second cooling device could be adapted to this configuration of the grinding machine by a corresponding height adjustment direction of the discharge device.
  • the possibility of height adjustment of the discharge device with respect to the kinematics of the grinding machine, in particular the trajectories of the loading plate could be advantageously used to improve the cooling of the workpieces or the grinding wheels, in particular the grinding zone. This can increase the productivity and energy efficiency of the grinding machine.
  • the height adjustment device is designed and arranged such that the outflow device can be moved out of or into the movement path of the loading plate.
  • the movement path of the loading plate results from the rotation of the turntable and an optionally superimposed rotation of the loading plate, as well as from the geometry of the loading plate.
  • the outflow device can into the trajectory of the loading plate, ie into a position in which it could come to a collision with the loading plate and / or possibly loaded workpieces, and out of the trajectory, ie in a position in which a collision kinematically is excluded, to be moved. In this way, on the one hand damage to the grinding machine is avoided.
  • the second cooling device but can be moved in the meantime in such positions, which would be advantageous for the cooling, but would lead to a collision with the loading plate when it is moved along its trajectory.
  • the outflow device is arranged radially outside the circumferential contour of the loading plate when the loading plate is in a grinding position.
  • the discharge device can be achieved that the discharge could be lowered laterally next to the loading plate to below the top of the loading plate.
  • the cooling fluid could be better supplied, in particular from the sides of the grinding zone, to the grinding zone, thereby achieving a more efficient and efficient cooling.
  • the height adjustment device comprises a drive, in particular a plurality of drives, for adjusting the outflow device.
  • the drive could, for example, be a pneumatic or electromotive drive, in particular comprise a linear motor.
  • the drive could serve via a, in particular programmable, control for adjusting the height of the discharge device.
  • the discharge device could thus be moved in the lower position at heights below the upper edge of the workpieces, for example, the height of the grinding zone.
  • the undersides of the workpieces could also be cooled by the second cooling device.
  • the cooling fluid can flow out of the exhaust device close to the workpieces and thus contribute to improved cooling.
  • the discharge device could be moved to the upper position, so that the workpieces and the loading plate pass under the lower edge of the discharge device, for example in a loading position.
  • the outflow device has a, preferably adjustable, nozzle with an outflow opening, wherein the outflow opening is preferably aligned in the direction of the grinding zone.
  • the nozzle could be manually or automatically adjustable.
  • a plurality of nozzles may be provided, which could each be differently oriented or adjustable. It would also be conceivable to orient the nozzle in the direction of the loading plate, which is in a grinding position, in order to cool or clean workpieces, in particular to blow them off, which have already left the grinding zone.
  • the cooling effect of the second cooling device can be further improved by an acceleration, deflection and alignment of the cooling fluid flow through a nozzle.
  • the outflow opening in the lower position of the outflow device lies substantially at the level of the grinding zone.
  • the grinding zone may be - if two grinding wheels are used - between the bottom of the loading plate and the top of the lower grinding wheel, or between the top of the loading plate and the bottom of the upper grinding wheel.
  • the outflow opening could thus be at the level of the workpiece undersides or the workpiece tops. In this way, the workpieces on their Bottom and / or top are cooled.
  • the workpiece top sides are to be cooled with the second cooling device.
  • the second cooling device has a telescopic pipe for supplying cooling air with a first feed pipe and a second feed pipe, which are arranged axially parallel to the axis of rotation of the loading plate into one another.
  • the diameter ratio of the first to second feed tubes may be greater than 1 or less than 1, and is to be chosen so that the feed tubes are substantially sealed together.
  • the telescopic pipe can have any cross-sectional shapes. It can also be provided a multi-part telescopic pipe with more than two supply pipes. As an alternative to a telescopic pipe, it would also be possible to use a hose which is variable in length, in particular elastic.
  • the first feed tube is fastened to the housing and the second feed tube to a front plate of the height adjustment device which is displaceably mounted axially parallel to the axis of rotation of the loading plate and, preferably by means of the drive, can be moved.
  • the front panel could also be referred to as a sled.
  • the storage of the front panel is preferably carried on the housing.
  • the front plate could follow the movement of the discharge device in the direction of the axis of rotation of the loading plate, for example by being guided in guide rails laterally on the housing.
  • cooling air is supplied to the first feed pipe from a cooling air supply unit, and the second feed pipe opens into the discharge device.
  • the cooling air supply unit may for example be a fan attached to the housing, in particular a fan, or a separate cooling air supply unit to which the grinding machine is connected.
  • two second cooling devices are provided, which are preferably arranged symmetrically to a central axis of the grinding machine. In this way, the cooling capacity can be further increased, and act evenly on both sides of the grinding zone.
  • the grinding machine comprises at least a third cooling device, each with at least one outflow device for a cooling fluid, wherein the third cooling device is fixedly mounted on the turntable, in particular relative to the turntable.
  • the third cooling device is a component of a cooling system, wherein not all components of this cooling system must be arranged in a co-rotating reference frame of the turntable.
  • a cooling air supply unit or a supply system for cooling air could be arranged in a fixed reference system, in particular outside the turntable.
  • the third cooling device is mounted on the turntable, but may still have degrees of freedom.
  • the third cooling device could be considered to be fixed relative to the turntable in that it, in particular as a whole, rotates in the rotating frame of the turntable. It could therefore be movable, for example, at least in the direction of the axis of rotation of the turntable, or have correspondingly movable components.
  • individual parts of the third cooling device for example sections of a line, controls such as nozzles, cooling air supply flaps or valves, or controls could be quite movable relative to the turntable, preferably adjustable or adjustable, or have moving parts.
  • the discharge device could have movable, preferably adjustable or adjustable, parts relative to the turntable.
  • Such a grinding machine according to the invention has the advantage that cooling by a cooling fluid, such as the workpieces or the loading plate, can be made at fixed relative to the turntable fixed positions regardless of the position of the turntable. As a result, the cooling performance can be improved. This can increase the productivity and energy efficiency of the grinding machine.
  • a cooling fluid such as the workpieces or the loading plate
  • the third cooling device has an inflow opening for a cooling fluid and a supply opening for the cooling fluid is formed in a boundary wall element of an outer chamber which at least partially surrounds the turntable, and the inflow opening coincides with the feed opening when the Turntable is turned so that the loading plate is in a grinding position.
  • the supply opening coincides with the inflow opening when the Loading plate is in a grinding position.
  • the third cooling device could thus be designed such that the inflow opening essentially comes to lie, for example, just directly above or below, the feed opening when the loading plate is in a grinding position, wherein the inflow opening and the feed opening are substantially close to each other could.
  • any shapes of the two openings would be conceivable, for example circular openings with an identical diameter.
  • the supply opening for the cooling fluid could be formed in a boundary wall element of an outer chamber or the intermediate chamber. In this way, it is possible to supply the third cooling device via a supply opening from outside the outer chamber with cooling air. As a result, the number of components of the cooling system of the grinding machine could be reduced, in particular the number of parts of the cooling system, which are mounted on the turntable. An improved cooling is possible in a structurally simple manner.
  • the third cooling device comprises an optionally one-piece or multi-piece line section, one end of which forms the inflow opening and the other end opens into the outflow device, wherein the outflow device has an outflow opening.
  • the outflow opening is preferably carried out at substantially the same distance in the direction of the axis of rotation of the loading plate from the turntable as the loading plate.
  • the outflow opening is thus preferably at the level of the loading plate, in particular at the level of a workpiece lower edge.
  • the line section is designed as a circular tube, more preferably as a vertically extending tube, but could for example also be provided as a hose or a channel, or with other cross sections, in particular variable cross sections.
  • the line section does not have to be exclusively vertical or straight, but may also be oblique or curved.
  • the outflow device could also be designed such that the outflow opening is located in the region above the loading plate, in particular projects into this region, for example, workpieces that have already exited the grinding zone, in the form of a cooling air shower from above with cooling air flow.
  • the cooling fluid can be passed from the inflow opening to the outflow opening, from where it can preferably flow as targeted as possible, for example, in the direction of the workpieces or the loading plate.
  • the cooling effect and efficiency of the third cooling device is further improved in this way.
  • the outflow device has a, preferably adjustable, nozzle with an outflow opening, wherein the outflow opening is preferably aligned with the loading plate.
  • the nozzle could be manually or automatically adjustable.
  • a plurality of nozzles may be provided, which could each be differently oriented or adjustable.
  • Workpieces in or on the loading plate could be cooled or cleaned using the nozzle, in particular blown off, even if the grinding zone has already left.
  • the cooling effect of the third cooling device can be further improved by an acceleration, deflection and alignment of the cooling fluid flow through a nozzle.
  • the third cooling device is firmly connected to a rotary wall element which is fixedly mounted on the turntable relative to the turntable.
  • rotating wall elements could be mounted on the turntable to form a lateral boundary surface of the outer chamber or intermediate chamber.
  • Rotary wall elements may define a cavity in which the third cooling devices are arranged or run through the line sections of the third cooling devices.
  • Turning wall elements could be aligned in the circumferential direction of the turntable and / or aligned in the radial direction of the turntable.
  • rotary wall elements are mounted on the turntable so that they extend in the radial direction through the axis of rotation.
  • radially oriented rotary wall elements could be designed as radially movable sliding doors.
  • the connection of the third cooling device to a rotary wall element preferably takes place via fastening means on the line section, for example via a pipe clamp, or a screwed or welded flange connection.
  • fasten the third cooling device directly, for example with the underside of the outflow opening on the turntable.
  • the line section could be integrated in a rotary wall element, or in one piece with this be executed.
  • a connection of the third cooling device with a rotary wall element lends itself to, if such a rotary wall element is provided anyway, for example, to prevent the direct frontal accessibility of the grinding zone for reasons of safety through rotary wall elements.
  • two third cooling devices are preferably arranged symmetrically to a connecting line between the axes of rotation of the turntable and the loading plate. In this way, the cooling capacity can be further increased, and act evenly on both sides of the loading plate.
  • the cooling device pairs can be arranged symmetrically to a radially extending rotary wall element.
  • the inflow openings of one of the two pairs of third cooling devices coincide with the feed openings when one of the two loading plates is in a grinding position. It can be guaranteed cooling by the cooling devices during the grinding process, especially for both loading plates, when they are in the grinding position.
  • a supply of cooling air via the supply openings can always be ensured of that pair of cooling devices which is arranged on the side of the turntable whose loading plate is currently in the grinding position. After one rotation of the turntable, the other pair of cooling devices could coincide with its inlet openings with the feed openings.
  • An arrangement with two cooling device pairs has the advantage that the productivity of the grinding machine according to the invention - especially when using two loading plates -, in particular by a better adapted to the kinematics of the grinding cooling, can be increased.
  • the feed openings are conveyed via a supply line system, in particular from outside the outer chamber, from a cooling air supply unit with cooling air provided.
  • the cooling air supply unit may be, for example, a fan attached to the grinding machine, in particular a fan, or a separate cooling air supply unit to which the grinding machine is connected.
  • the feed openings could also be supplied with cooling air from outside the intermediate chamber.
  • the supply system could include pipes, hoses or channels, and in particular be composed of several sections.
  • a fourth cooling device which, preferably centrally, is attached to the shielding device.
  • the fourth cooling device preferably delivers cooling air to the upper side of the loading plate from above or from the front, as a result of which, in particular, the upper workpiece edges of a workpiece are cooled.
  • the fourth cooling device is in particular attached to the outside of the shielding device and preferably has at least one outflow opening approximately at the level of the lower edge of the shielding device.
  • the discharge opening is preferably directed across the lower edge of the shielding device in the direction of the inner chamber, so that cooling air can be blown into the upper grinding zone.
  • the fourth cooling device has two cooling channels, which preferably transition from a vertical orientation of the outflow openings to the sides into a substantially horizontal orientation, in particular with a change in cross section, and in particular via a lateral inflow opening, in particular with cooling air hoses connected thereto, with cooling air be supplied.
  • fifth cooling devices with outflow openings are integrated into the outer wall of the outer chamber, wherein the outflow openings are designed as ventilation slots, which extend in particular along a lower boundary surface of the outer chamber via which cooling air is supplied to the outer chamber.
  • supply openings to cooling devices are supplied with cooling air from a cooling air supply unit via a common supply system, in particular with branch pipe elements.
  • cooling devices in intermediate doors and on the turntable mounted cooling devices could be supplied via common manifold elements from the outside with cooling air.
  • a separate cooling air supply unit for example a fan or a fan, does not have to be provided for each cooling device. Cooling can become more efficient and economical.
  • the volume flow of the cooling air through the outflow opening preferably via cooling air supply flaps in the supply system and / or in the line section, more preferably for each of the outflow individually, adjustable, in particular controllable.
  • the cooling air supply could be adapted to the stage of the grinding process, or to the configuration of the grinding machine, in particular to the position of the loading plates. If a loading plate is currently not in a grinding position, the cooling air supply could be reduced or switched off, in particular by cooling air supply flaps.
  • a method is conceivable which is preferably automatically controlled by a control unit in which, at the beginning of grinding, the cooling air supply to cooling devices is switched on or raised by the regulation of cooling air supply flaps and at the end of grinding the cooling air supply to cooling devices is switched off by the control of cooling air supply flaps or be reduced.
  • the energy efficiency of the grinding machine can be further increased.
  • the spread of grinding dust and / or exhaust air and / or sparks and / or heat and / or noise spatially in particular in a scale graduated extent, preferably from the inside to the outside, namely substantially to the area within the inner chamber and the intermediate chamber, limited, or at least reduced.
  • the spread of grinding dust and / or exhaust air and / or sparks from the upper grinding zone, with the shielding device closed is essentially limited to the inner chamber and from the lower grinding zone substantially to the intermediate chamber.
  • the method step c) can also be omitted if the positioning of the shielding device, for example due to an unchanged loaded type of workpieces, is unnecessary.
  • the method steps c) and d) can also be reversed in the order or carried out simultaneously.
  • an intermediate chamber moreover, the cooling of the workpieces and / or the loading plate can be improved, for example, by targeted and thus effectively supplied in the intermediate chamber the workpieces or the loading plate, in particular the lower grinding zone, cooling air.
  • the air flow within the intermediate chamber can be optimized, for example, by the geometry of the intermediate chamber and the design of the outflow opening of the first cooling device in such a way that the grinding dust and exhaust air are better removed from the grinding zone or carried away.
  • additional cooling devices for example second and third cooling devices, can be targeted in the intermediate chamber to the grinding zone or the loading plate and the total volume flow of cooling fluid thereby be reduced. This can contribute to the higher energy efficiency of the grinding machine.
  • the grinding of the workpieces is carried out in a plurality of successively connected grinding steps, wherein during a rough grinding, the shielding device is closed, in particular lowered, and the at least one intermediate door is closed.
  • the intermediate door can already be opened. In this way, the productivity of the grinding machine can be further increased, because at the end of the complete grinding process, ie rough grinding and fine grinding, there is no need to wait until the intermediate doors are opened so that the loading plate can move from the grinding position to the loading position.
  • the Occupational safety can be increased if in addition outer doors of the outer chamber are provided, which are still closed during the opening of the intermediate doors, with rotating parts such as loading plates and grinding wheels, which may pose a certain risk of accidents at work, even with opened intermediate doors or open shielding for an operator The grinding machine would not be freely accessible.
  • the method comprises lowering a second cooling device, in particular a nozzle for cooling air, into a lower position in the region of the height of the loading plate, preferably before grinding the workpieces, and lifting the second cooling device into an upper position in which the loading plate can pass with workpieces at the lower end of the cooling device.
  • the loading plate is moved to a grinding position by rotation of the turntable, so that inflow openings of a third cooling device, which is mounted on the turntable, coincide with feed openings in an outer chamber.
  • a third cooling device which is mounted on the turntable.
  • the cooling performance can be improved.
  • the ineffective blowing out of cooling air for example, if the inlet openings just not coincide with the feed openings, can be avoided. This can increase the energy efficiency of the grinding machine.
  • the grinding of the workpieces is carried out in a plurality of successively connected grinding steps, in particular rough grinding and fine grinding, wherein at the beginning of rough grinding, increasing or switching on the cooling air supply to cooling devices of the intermediate doors, preferably by openingde Kunststoffzuzuchtklappen, takes place and at the end of the rough grinding, a reduction or switching off the cooling air supply to cooling devices of the intermediate doors, preferably by closingdeluftzuzuchtklappen takes place.
  • the cooling of workpieces and / or loading plates can be increased precisely for the phases of the grinding process in which a lot of heat is generated.
  • it can be prevented that, especially during the fine grinding, a superfluous cooling takes place, which requires unnecessary energy. This can contribute to better productivity through a greater allowable grinding rate and to the higher energy efficiency of the grinding machine.
  • FIGS. 1a and 1b show an embodiment of a grinding machine 1 according to the invention, which in FIG. 1a in a side view and in FIG. 1b is shown in a plan view.
  • a turntable 10 is rotatably mounted about a rotation axis A.
  • the storage (not shown in detail) can be carried out in a housing or a foundation of the grinding machine 1.
  • the grinding machine is constructed substantially symmetrically to a center plane M.
  • the turntable 10 is fixed axially and has a circular cylindrical basic shape and could also be made in several parts. In the turntable 10 are diametrically to the axis of rotation A. opposite two loading plates 11 mounted eccentrically to the axis of rotation A.
  • the loading plates 11 are each mounted about a rotational axis B rotatably mounted on a loading plate shaft (not shown in detail). It is conceivable to arrange more than two loading plates 11, for example three or four, about the axis of rotation A.
  • a circular cylindrical loading plate 11 with the two base surfaces 111 a plurality of workpiece receiving devices 34, designed here as circular bores, provided over the circumference of the loading plate 11 in different radial positions.
  • workpieces 12 are inserted or inserted, wherein the workpieces 12 in the axial direction of the workpiece receiving devices 34 are freely movable.
  • the turntable 10 is surrounded by an annular table top 31, which has a circular cutout of the size of the diameter of the turntable 10.
  • the table top surface 311 of the table top 31 is flush with the turntable surface 101.
  • On the left side is a loading plate 11 in the loading position L and on the right side a loading plate 11 is shown in the grinding position S.
  • Workpieces 12 inserted into the workpiece receiving devices 34 may slide over the turntable surface 101 and the table top surface 311.
  • the loading plates 11 can rotate clockwise or continuously about the axes of rotation B via servomotors (not shown), which are preferably mounted co-rotating below the turntable 10.
  • the grinding unit 13 has at least one grinding wheel 14, here two grinding wheels 14, which is mounted in each case rotatably on a grinding spindle 40 about the rotation axis C and is driven by a grinding wheel drive 41, for example a servomotor.
  • a grinding wheel drive 41 for example a servomotor.
  • two grinding wheels 14 are provided, whose axes of rotation C are aligned and run parallel to the axes of rotation B of the loading plate 11.
  • the two grinding wheels 14 are each displaceable along their axis of rotation, so they can be adjusted to different workpiece lengths, and can be joined in the direction of the loading plate 11.
  • the axes of rotation C of the grinding wheels 14 are tilted relative to each other or to the axis of rotation B of the loading plate 11 in order to adjust the abrasion on the workpieces 12 in the case of a continuous loading plate 11.
  • the workpieces 12 are preferably cylindrical or conical helical compression springs (in FIG. 1a a workpiece 12 is sketched as a helical spring), which are inserted in workpiece receiving devices 34, which are for example in the form of through holes, for example, frictionally engaged and can be simultaneously ground plane-parallel by both grinding wheels 14 at its upper and lower end of the spring.
  • the grinding pressure between the grinding wheel 14 and workpiece 12 is adjusted via an infeed of the grinding wheels 14 by the compression of the springs.
  • the current spring length can be monitored by a spring length measuring system (not shown) and the grinding pressure can be adjusted by an automatic delivery of the grinding wheels 14.
  • the wear of the grinding wheels 14 may be monitored by a grinding wheel wear control system (not shown) and optionally automatically compensated.
  • the axial position of the loading plate 11 can be adjusted depending on the dimensions of the workpieces 12 to be ground, in particular the length of the springs.
  • the table plate 31 on the side of the grinding position S has a recess 312 which is adapted to the diameter of the grinding wheel 14.
  • the radial position of the axis of rotation B on the turntable 10 and the bearing (not shown) of the grinding unit 13, for example in the housing 24, are selected so that a loading plate 11 radially overlaps with the grinding wheels 14 in a grinding position S.
  • This radial overlap region defines a grinding zone 15 in which the workpieces 12 come into sliding contact with the grinding surfaces 141 of the grinding wheels 14.
  • the grinding zone 15 comprises two separate grinding zones, namely an upper grinding zone 15a above the loading plate 11 and a lower grinding zone 15b below the loading plate 11.
  • the grinding zones 15a, 15b are bounded laterally by the overlapping region of the grinding wheels 14 with the loading plate 11.
  • the upper grinding zone 15a extends between the grinding surface 141 of the upper grinding wheels 14 and the base 111 on the upper side 113 of the loading plate 11.
  • the lower grinding zone 15b extends between the base 111 on the lower side 114 of the loading plate 11 and the grinding surface 141 of the lower grinding wheels 14.
  • the upper workpiece ends 121, in particular upper spring ends, and in the lower grinding zone 15b the lower workpiece ends 122, in particular lower spring ends, are ground.
  • a grinding zone 15a, 15b can also be used as the be defined as a two-dimensional contact surface in which a workpiece end 121, 122 and a grinding wheel 141 touch, or be considered as the three-dimensional space through which the contact surface during the duration of the grinding process in the direction of the axis of rotation C of the grinding wheels 14 shifts.
  • Supplied cooling air is discharged as exhaust air through the suction opening 33 by means of a suction device (not shown).
  • the suction opening 33 is formed from the grinding zone 15 behind the grinding wheels 14 in the housing 24.
  • FIGS. 1a and 1b the structure of a grinding machine 1 according to the invention with a grinding chamber 16 and at least one outer chamber 17.
  • the grinding chamber 16 is divided by the shielding device 38 into an inner chamber 36 and an intermediate chamber 37.
  • the geometry of the intermediate chamber 37 is adapted to the circumferential contour 112 of the loading plate 11 in the grinding position S, while the inner chamber 36, the grinding unit 13 substantially encloses and is geometrically adapted to the peripheral contour 142 of the grinding wheels 14.
  • the grinding zone 15 is enclosed by the grinding chamber 16, wherein the grinding chamber 16 is not completely closed, but formed so that the turntable 10 and the table top 31 protrude into the grinding chamber 16 and the table top surface 311 and the turntable surface 101 form part of its lower boundary surface ,
  • the grinding chamber 16 and the inner chamber 36 and the intermediate chamber 37 are not completely sealed, in particular airtight, but substantially to the outlet of grinding dust, abrasive particles, sparks or coolant to the outside tight and can each by multi-part lower boundary surfaces, in particular curved side surfaces and upper Limiting surfaces with varying height be geometrically limited.
  • the inner chamber 36 is bounded laterally and above substantially by the housing 24 and delimited on the front side by the front plate 26 and the shielding device 38 attached thereto, more precisely, the inside of the grinding zone 15 facing the intermediate chamber 37.
  • the front plate 26 is vertically displaceable on the housing 24 in guide rails 35, in particular by means of a drive (in Fig. 1a and 1b not shown) height adjustable, attached.
  • the shielding device 38 can at the height adjustable front panel 26 in turn be mounted adjustable in height.
  • the shielding device 38 can be moved vertically relative to the front plate 26, for example via an intermediate rod.
  • the shielding device 38 is designed as a grinding chamber shield adapted to the circumferential contour 142 of the grinding wheels 14.
  • the front panel 26 itself could also be functionally understood as a shielding device 38.
  • the shielding device 38 can be delivered from above onto the workpiece upper edge 121 or the upper side 113 of the loading plate 11.
  • the inner chamber 36 is lockable except for an inlet gap for the loading plate 11 and workpieces 12 received therein.
  • the shielding device 38 has inlet devices 39, preferably in the form of beveled inlet plates mounted on both sides of the underside of the shielding device 38, for facilitating the retraction of workpieces 12 into the inner chamber 36.
  • the shielding device 38 when lowered during the grinding process, shields the intermediate chamber 37 from abrasive dust, abrasive particles, sparks, or coolant leaking from the grinding zone 15, particularly the upper grinding zone 15a.
  • the intermediate chamber 37 is closed at the top by an upper boundary surface 372 of the ceiling member 176 and bounded on the sides by lateral boundary surfaces 373 including the inside of a rotary wall member 102 and the outside of the front panel 26 and the shield device 38.
  • one or more rotary wall elements 102 are provided which are fixedly mounted on the turntable surface 101 of the turntable 10 and co-rotate with the turntable 10 and are adapted here to the circumferential contours 112 of the two loading plates 11.
  • the rotary wall elements 102 are designed point-symmetrical to the axis of rotation A, so that they assume congruent positions when the turntable 10 between a loading position L and a grinding position S is rotated back and forth.
  • the rotary wall elements 102 are preferably made with thin sheets and include a cavity.
  • a viewing window can be provided in the rotary wall elements 102, preferably centrally, so that the grinding chamber 16 can be viewed from the loading position L.
  • a first rotary wall element which is substantially along the circumferential direction of the Turntable 10 is aligned and a second rotary wall element, which is aligned along the radial direction of the turntable 10, to provide, wherein the first rotary wall element T-shaped abuts the second rotary wall element.
  • the intermediate chamber 37 has an intermediate door 18, which is rotatably mounted about a pivot axis D.
  • the intermediate door 18 can be pivoted back and forth, preferably by means of a drive (not shown), between the closed state G and the opened state O (indicated by the dashed-line intermediate door 18).
  • a closed state G of the intermediate door 18 the door inner surface 181 of the door leaf 182 forms a lateral boundary surface 373 of the intermediate chamber 37.
  • the lower boundary surface 371 of the intermediate chamber 37 is substantially constituted by parts of the tabletop surface 311 and the turntable surface 101.
  • the door lower edge 183 terminates flush with the lower boundary surface 371 of the intermediate chamber 37, just as the upper edge of the door 184 is flush with the upper boundary surface 372 of the intermediate chamber 37.
  • the lower edge of the door 183 extends below the underside 114 of the loading plate 11, namely immediately above the turntable surface 101.
  • the intermediate chamber 37 is substantially leak-tight to the side for grinding dust, abrasive particles, sparks or exhaust air emerging from the grinding zone 15, in particular the lower grinding zone 15b.
  • a loading plate 11 can be moved from the grinding position S past the opened intermediate door 18 into a loading position L.
  • the intermediate door 18 has a door leaf 182 whose door leading edge 185 is flush with the lateral boundary surface 373 of a rotary wall element 102.
  • the outer chamber 17 has outer doors 19, which pivotally adjoin the outer wall 174. In a closed state of an outer door 19, this closes flush with the rotary wall element 102, while in an open state, a loading plate 11 can be moved past the opened intermediate door 18 from a grinding position S to a loading position L.
  • the outer chamber 17 has a, preferably circular segment-shaped door leaf space 173, in which the intermediate door 18 can pivot in the open state O.
  • the opening angle of the intermediate door 18 must be large enough so that the opened intermediate door 18 with its lower door edge 183 does not collide with the peripheral contour 112 of the loading plate 11 when it is moved past the intermediate door 18 by rotation of the turntable 10.
  • the outer chamber 17 is closed at the top by the upper boundary surface 172 of the ceiling element 176.
  • a first cooling device 20 is integrated in the intermediate door 18 (in FIG Figure 1c shown in detail).
  • the first cooling device 20 has an inflow opening 202 at the height of the top edge 184 of the door.
  • a supply port 375 is formed in the upper boundary surface 172 of the outer chamber 17, a supply port 375 is formed.
  • the feed opening 375 and the inflow opening 202 are here circular and of equal size, but could take any other forms, as long as they are congruent.
  • the first cooling device 20 has an outflow opening 201 along the lower edge of the door 183.
  • the outflow opening 201 is connected to the inflow opening 202 via a line section 203, so that a cooling fluid can flow from outside the intermediate chamber 37 and the outer chamber 17 via the feed opening 375 to the outflow opening 201.
  • the outflow opening 201 is designed here as a ventilation slot along the entire length of the lower door edge 183.
  • the outflow opening 201 could, however, also be designed, for example, as a nozzle or a plurality of nozzles along the lower door edge 183 or at any other positions of the inner door surface 181.
  • the intermediate door 18 such that the outflow opening 201 projects into the intermediate chamber 37 in order to achieve a smaller distance from the peripheral contour 112 of the loading plate 11.
  • the line section 203 is designed as a vertical tube, which extends on the outside of the intermediate door 18. But it could just as well be mounted on the inside of the intermediate door 18, in which case the feed opening 375 would have to be formed in the upper boundary surface 372 of the intermediate chamber 37.
  • the intermediate door 18 has a distribution channel 204, which serves to distribute the cooling air from the line section 203 uniformly over the outflow opening 201.
  • the cooling air supply unit 27 supplies via the supply system 28 (shown only schematically) the first cooling device 20 through the supply opening 375 with cooling air, wherein the supply system 28 is equipped with controllable cooling air supply flaps 30 or valves.
  • the inflow openings 202 always coincide with the supply openings 375 when, after a rotation of the turntable 10 by 180 °, one of the two loading plates 11 is in a grinding position S.
  • Figure 1c shows four embodiments of the intermediate door 18 according to the invention, wherein the side view is the same in each case and differences in the profile in the plan view are shown on a section along the line YY.
  • the dimensions of the intermediate door 18 are not necessarily drawn to scale.
  • the intermediate door 18 may deviate from a rectangular basic shape, for example by bevelled edges, a rounded outline, or an unevenly shaped door leaf 182.
  • the door leaf 182 is rotatable about the pivot axis D and could, for example, by means of hinges, a door hinge or pin, in boundary wall elements, an outer wall 174 or lower or upper boundaries of the outer chamber 17 or intermediate chamber 37 to be pivotally mounted.
  • the intermediate door 18 could be sealed all around, ie along the upper edge of the door 184, the door leading edge 185, the lower door edge 183 and along the pivot axis D, or partially against the escape of grinding dust or exhaust air, for example with sealing lips made of rubber.
  • the conduit section 203 of the first cooling device 20 extends in the form of a circular tube along the front edge 184 of the door leaf 182, which opens into a distribution channel 204 which distributes the inflowing cooling fluid along the outflow opening 201.
  • the line section 203 may be connected to the door leaf 182 as a separate tube element, but could also be integrated into the door leaf 182, and any other, in particular not rectilinear or lying on the door leaf between the inlet opening 202 and the outflow opening 201.
  • the depth of the distribution channel 204 decreases continuously, as in FIG all four variants shown in Figure 1c shown, These variants are only examples.
  • the line section 203 and the distribution channel 204 could also run on the inside of the door.
  • nozzles in particular with adjustment devices, for example slats or ball nozzles, may be provided in order to be able to set the outflow direction of the cooling fluid flow precisely. This could also be done automatically by means of an adjusting device (not shown), for example adapted to the geometry of a specific loading plate 11 or the loaded workpieces 12. By a curved door 182, the door inner surface 181 can fit snugly against the loading plate 11.
  • the door inner surface 181 in the closed state G of the intermediate door 18 with respect to the pivot axis D closer to the grinding zone 15, in particular arranged between the loading plate 211 and the intermediate door 18 second cooling devices 21, which is preferably attached to the front panel 26.
  • the cooling of the loading plate 11, the workpieces 12 and / or the grinding zone 15, in particular the lower grinding zone 15b made particularly effective, because by the smaller distance between discharge opening 201 and workpiece 12, the convection of the object to be cooled stronger.
  • the grinding machine 1 is composed of three different, preferably at least partially nested, chambers, namely the outer chambers 17, the intermediate chamber 37 and the inner chamber 36 constructed.
  • the outer chamber 17 in addition to a sealing function, especially the safety at work is increased.
  • the intermediate chamber 37 with closed intermediate door 18 an additional seal of the outer chamber 17 and the environment against grinding dust and / or exhaust air and / or sparks and / or heat and / or noise from the grinding zone 15 is achieved.
  • the intermediate chamber 37 encloses the lower grinding zone 15b, while the inner chamber 36 substantially encloses the upper grinding zone 15a when the shielding device 38 is suitably positioned, in particular lowered.
  • a cooling fluid in particular cooling air, particularly targeted and effective for cooling the loading plate 11 and / or the workpieces 12 received therein within the intermediate chamber can be circulated and passed through the intermediate chamber 37, in particular with the loading tray 11 as close as possible, in particular in the lower Grinding zone 15b.
  • sparks or cooling liquid need not be a complete separation between the chambers. For example, very narrow gaps or indirect, in particular angled passages between the chambers, or in the environment of the grinding machine could exist.
  • FIG. 2 shows a plan view of the interior of an embodiment of the grinding machine 1 according to the invention, which is constructed symmetrically to the center plane M and substantially with the embodiment of the FIGS. 1a to 1c matches.
  • Intermediate doors 18 are curved, along the pivot axes D, for example, with hinges, rotatably mounted, preferably via motors (not shown) actuated and tightly sealed with the lateral boundary surfaces 373 of the intermediate chamber 37.
  • further cooling devices namely a height-adjustable second cooling device 21, a co-rotating third cooling device 22 and a central fourth cooling device 23 are provided, which could also be combined individually with one another in one embodiment.
  • the common supply system 28 to the cooling devices 20 and 22 is provided with controllable cooling air supply flaps 30, or valves, and a branch pipe element 29, which feeds cooling air to each of the supply ports 375 and 175.
  • the second cooling device 21 is fixed to the front plate 26 and supplies the grinding zone 15, preferably the upper grinding zone 15a, with cooling air from the side.
  • Third cooling devices 22 are arranged with line sections 223, here designed as vertical tubes, within the cavity between the rotary wall elements 102 and have outflow 224, in particular curved, preferably the peripheral contour 112 of the loading plate 11 following, ventilation slots, for cooling air along the lower edges of the rotary wall elements 102 , so that cooling air is blown near the bottom into the intermediate chamber 37, in particular at the level of the ventilation slots of the first cooling device 20.
  • the fourth cooling device 23 is attached, preferably centrally, to the shielding device 38 and leads via an outflow opening 231 of the upper side 113 of the loading plate 11 from above or front cooling air, whereby upper workpiece edges 122 are cooled.
  • the outflow opening 231 is directed from outside over the lower edge of the shielding device 38 in the direction of the inner chamber 36, so that cooling air is blown into the upper grinding zone 15a.
  • FIG. 3 shows a plan view of an embodiment of a grinding machine according to the invention 1.
  • the ceiling element 176 forms a common ceiling of the outer chamber 17 and the intermediate chamber 37 with corresponding upper boundary surfaces 172 and 372.
  • the height of the two grinding chambers 17, 37 could also vary and in particular be different.
  • the door leaf spaces 173 are formed so that the intermediate doors 18 (indicated by dashed lines) can be opened sufficiently wide.
  • the third cooling devices 22 exactly two pairs each having a first inflow opening 222a and a second inflow opening 222b are provided, wherein the two first inflow openings 222a and the two second inflow openings 222b are arranged point symmetrical to the rotation axis A of the turntable 10.
  • the inflow openings 222a, 222b of a pair of third cooling devices 22 always coincide with the supply openings 175 when one of the two loading plates 11 is in a grinding position S.
  • a supply of cooling air via the feed openings 175 can always be ensured for that pair of cooling devices 22 which is arranged on the side of the turntable 10 whose loading plate 11 is currently in the grinding position S.
  • the respective other pair of cooling devices 22 with its inflow openings 222a, 222b comes into coincidence with the supply openings 175.
  • FIGS. 4a and 4b show an embodiment of the grinding machine according to the invention, which in FIG. 4a in a side view and in FIG. 4b is shown in a plan view.
  • the outer chamber 17 and the intermediate chamber 37 and intermediate chamber doors 18 are not shown here.
  • the detailed description of the parts indicated by reference numerals and their operation, already in connection with the FIGS. 1a to 1c . 2 and 3 are not repeated and apply to the FIGS. 4a and 4b corresponding.
  • a second cooling device 21 is attached to a housing 24.
  • the grinding unit 13 may be mounted in the housing 24 or in another part of the grinding machine 1.
  • the housing 24 may be connected to the bearing point of the axis of rotation A of the turntable 10 or be designed as a separate housing.
  • the housing 24 may be made in several parts.
  • the cooling device 21 is designed to be adjustable in height, wherein at least the height of the outflow device 211 is adjustable.
  • the second cooling device 21 is connected via a supply system 28 to a cooling air supply unit 27, for example a fan or a fan.
  • the delivery system 28 may include tubes and / or tubes or other channels of any cross-section and may also be mounted within the housing 24.
  • the cooling air supply unit 27 is shown here as an independent unit, but is preferably mounted on the outside of the housing 24, wherein it could also be accommodated in the housing 24.
  • the second cooling device 21 is embodied here as a two-part telescopic tube 213 with a first feed tube 214 and a second feed tube 215.
  • the second cooling device 21 could also be a multi-part telescopic tube, an elastic tube or another variable-length, in particular sixteen- and proceedingsschiebbare structure.
  • the telescopic tube 213 may have any cross-section, in particular circular, elliptical or rectangular cross-sections.
  • first supply pipe 214 has a slightly larger diameter than the second supply pipe 215, so that the second supply pipe 215 can be inserted from below into the first supply pipe 214.
  • the cross-sectional ratio of first to second feed tube (214, 215) could also be reversed.
  • the first supply pipe 214 is fixedly connected to the housing 24 via a first fastener 217, such as a pipe clamp or bolted flange connector.
  • the second feed tube 215 is fixedly connected to a front plate 26 via a second fastener 218, such as a pipe clip or bolted flange connector.
  • the front plate 26 is adjustable in height, that is displaceably guided in the direction of the axis of rotation B of the loading plate 11 on the housing 24.
  • the front panel 26 could be guided, for example, in lateral, vertical guide rails 35, in particular like a carriage.
  • the position of the front panel 26 is variable via a height adjustment 25, which includes, for example, a hydraulic, pneumatic or electric motor drive 32, preferably a linear motor, in particular adjustable.
  • a height adjustment 25 which includes, for example, a hydraulic, pneumatic or electric motor drive 32, preferably a linear motor, in particular adjustable.
  • an additional drive could be provided, which has a Connection with the second supply pipe 215, a height adjustability of the discharge device 211, relative to the front plate 26 allows.
  • the fourth cooling device 23 may be structurally connected to the second cooling devices 21, for example via a transverse bar.
  • Line sections of the fourth cooling device 23, as well as the second cooling devices, 21 may be designed with telescopic pipes and be height adjustable together with the second cooling devices 21, in particular via the same drives, in particular relative to the front panel 26 and / or the shielding device 38.
  • the outflow device 211 can be moved between an upper position OP and a lower position UP.
  • the lower position UP the lower edge 219 of the discharge device 211 is below the workpiece upper edge 121 of the workpieces 12, while in an upper position OP above it. In this way it is achieved that the equipped with workpieces 12 loading plate 11 can pass under the second cooling device 21 when it is in the upper position OP.
  • the outflow opening 212 is approximately at the level of the grinding zone 15. In particular, the outflow opening 212 can be so deep that the lower edge 219 of the outflow device 211 penetrates in the region of the movement path of the loading plate 11.
  • the outflow device 211 is positioned in the lower position so that outflow opening 212 is at the level of the tool upper edge 121, ie between the underside of the upper grinding wheel 14 and the top of the loading plate 11.
  • the upper position OP is just above the upper edge of the workpieces 12th shown. But it can also be located further above, in particular, to maintain a safety distance to the workpiece top edge 121.
  • the upper position OP could be chosen so far up, for example, until the second feed tube 215 comes to a stop point in the first feed tube 214 when pushed into the second feed tube 215, or the carriage 26 reaches an upper stop point.
  • the lower position UP could be chosen so far down to the lower edge 219 of the discharge device 211 with the surface 311 of the plate 31 and the surface 101 of the turntable 10 would collide, or the front panel 26 reaches a lower stop point.
  • the second cooling device 21 is positioned so that the outflow device 221 is arranged radially outside the circumferential contour 112 of the loading plate 11, which is in a grinding position S.
  • the outflow device 211 has a nozzle 216 which is aligned with the grinding zone 15.
  • the nozzle 216 may have different orifice cross-sections, for example a rectangular or elliptical cross-section.
  • the nozzle 216 may be designed to be manually or automatically rotatable about the longitudinal axis of the second cooling device 21, for example in order to be able to align the nozzle 216.
  • the nozzle 216 may comprise adjusting elements, for example tiltable lamellas, with which the outflow angle of the cooling fluid can be adjusted.
  • FIGS. 5a and 5b show an embodiment of the grinding machine according to the invention, which in FIG. 5a in a side view and in FIG. 5b is shown in a plan view.
  • the intermediate chamber 37 and the inner chamber 36 and intermediate chamber doors 18 are not shown separately here.
  • the detailed description of the parts indicated by reference numerals and their operation, already in connection with the FIGS. 1a to 1c . 2 . 3 . 4, 4a and 4b are not repeated and apply to the FIGS. 5a and 5b corresponding.
  • a third cooling device 22 is fixed relative to the turntable 10 via a rotary wall element 102 which is fixedly connected to the turntable 10, that is, co-rotating with it.
  • the third cooling device 22 comprises a line section 223, an inflow opening 222 and an outflow device 221, which has an outflow opening 224.
  • the third cooling device 22 is located in an outer chamber 17 or a grinding chamber 16 which surrounds the loading plate 11 in the grinding position S and the grinding unit 13.
  • the outer chamber 17 is bounded laterally by the outer wall 174, the rotary wall element 102 and an outer door 19.
  • the boundary ceiling element 176 closes the outer chamber 17 upwards and has a feed opening 175.
  • two pairs of cooling devices 22 are provided, which are arranged symmetrically to the rotary wall element 102 on the turntable 10.
  • the rotary wall element 102 extends in the radial direction of the turntable 10 through the axis of rotation A.
  • the feed opening 175 always coincides with an inflow opening 222, when the loading plate 11 in a Grinding position S or a loading position L are located.
  • the third coolers 22 move in circular orbits about the rotation axis A of the turntable 10.
  • a cooling fluid can flow into the conduit section 223 through the supply system 28 from a cooling air supply unit 27 as the inflow port 222 of that conduit section with the feed opening 175 in coverage.
  • the nozzle 225 may have different orifice cross-sections, for example a rectangular or elliptical cross-section.
  • the nozzle 225 may be designed to be manually or automatically rotatable about the longitudinal axis of the third cooling device 22, for example in order to be able to align the nozzle 225.
  • the nozzle 225 may comprise adjusting elements, for example fins, with which the outflow angle of the cooling fluid can be adjusted.
  • the conduit section 223 is designed as a vertical tube with a circular cross section, but could assume any other cross sections as long as the shape of the inflow opening 222 coincides with that of the feed opening 175. It is conceivable to attach sealing elements, for example sealing lips, to the inflow opening 222 or the feed opening 275 in order to seal a remaining gap between the line section 223 and the boundary ceiling element 176 against the escape of cooling fluid.
  • the line section 223 is fixedly connected to the rotary wall element 102 with fastening elements 226, for example pipe clamps or flange elements with a screwed or welded connection.
  • the third cooling device 22 could, for example, also be fastened directly on the surface 101 of the turntable 10, for example with the underside of the outflow device 221.
  • FIGS. 6a to 6c show an embodiment of the grinding machine according to the invention, which in FIG. 6a in a plan view of the interior in section YY, in FIG. 6b in a plan view and in FIG. 6c in a side sectional view through the plane M is shown.
  • This embodiment combines many of the features of the previously described embodiments of the grinding machine according to the invention.
  • the detailed description of the parts indicated by reference numerals and their operation, already in connection with FIGS. 1a to 1c . 2 . 3 . 4a and 4b , and 5a and 5b be explained not repeated and apply to the FIGS. 6a to 6c corresponding. Differences or additions to it are described below.
  • the grinding machine 1 is constructed symmetrically to the center plane M.
  • First, second, third and fifth cooling devices 20, 21, 22, 50 are combined in a single embodiment, and any sub-combination would be possible.
  • Two different cooling air supply units 27 are shown, but which could also be combined into a single one, or could each be assigned to a single cooling device.
  • the supply system 28 to the cooling device 21 (in FIG. 6b not shown) equipped with adjustable cooling air supply flaps 30 or valves and leads through the housing 24 to an outside, for example, laterally on the housing 24, mounted cooling air supply unit 27.
  • the supply system 28 to the cooling devices 20 and 22 is with adjustable cooling air supply flaps 30, or valves, and a Branch tube member 29 which supplies each of the supply ports 375 and 175 cooling air.
  • the inflow openings 202 and 222, or the cross sections of the line sections 203 and 223 connected thereto, may be different in diameter and / or shape, for example.
  • the first rotary wall element 103 is curved and approximately follows the circumferential contour of the turntable 10.
  • the second rotary wall element 104 is designed here as a sliding door 105 with two sliding in the radial direction of the turntable 10, or run by a drive, sliding door elements. The sliding door 105 can enter the area on the inside of the outer doors 19.
  • the second rotary wall element 104 as pivotable doors.
  • Fifth cooling devices 50 are provided on the outside of the outer wall 174 and have outflow openings 501 on the inside of the outer wall 174 at the level of the lower boundary surfaces 171 of the outer chamber 17, which are supplied with cooling air via distribution channels.
  • the second cooling devices 22 exactly two pairs each having a first inflow opening 222a and a second inflow opening 222b are provided, wherein the two first inflow openings 222a and the two second inflow openings 222b are arranged point symmetrical to the rotation axis A of the turntable 10.
  • the cooling device pairs 22 are arranged symmetrically with respect to the second rotary wall element 104.
  • Embodiments of the grinding machine according to the invention are conceivable in which only first cooling devices, only second cooling devices, only third Cooling devices, first and second cooling devices combined, first and third cooling devices combined, second and third cooling devices combined or realized all three cooling devices are combined, in each case with fourth and / or fifth cooling devices together.
  • FIG. 7 shows a flowchart of an embodiment of a method according to the invention.
  • the method begins with the loading 1000 of the loading plate 11 with workpieces 12, in particular coil springs, which are to be ground in the grinding machine 1 according to the invention, in particular spring end grinding machine.
  • This loading 1000 can be done manually, for example by an operator of the grinding machine 1, or automated, for example by means of a robot.
  • the loading plate 11 is mounted eccentrically rotatably on a turntable 10 and is located for loading 1000 in a loading position L.
  • a method 1001 of the loading plate 11 by an outer chamber 17 in a grinding position S instead by the turntable 10 is rotated.
  • the loading plate 11 passes through an open outer door 19 and continues past an open pivotable intermediate door 18 along its predetermined trajectory.
  • the outer door 19 can now, for example by a drive, be closed, so that the outer chamber 17 and a further inner intermediate chamber 37 or inner chamber 36, in particular possibly dangerous, rotating parts such as loading plate 11 and grinding wheels 14 advantageous for safety no longer are accessible outside.
  • the grinding chamber 16 is divided into an inner chamber 36 and an intermediate chamber 37, so that the grinding zone 15 is at least partially, in particular the upper grinding zone 15a, enclosed by the inner chamber 36.
  • the positioning 1002 of the shielding device 38 can also take place during the method 1001 of the loading plate 11, or omitted completely, for example, if the type of workpieces 12 to be processed has not changed and an adjustment of the positioning, in particular the height of the shielding device 38, preferably to a different spring length, or a readjustment can be omitted.
  • a grinding chamber 16 which is spatially composed of the intermediate chamber 37 and the inner chamber 36, separated from the outer chamber 17 spatially.
  • the intermediate chamber 37 encloses the lower grinding zone 15b when the intermediate doors 18 are closed.
  • the complete grinding zone 15, ie the upper grinding zone 15a and the lower grinding zone 15b, in which the grinding 1004 of the workpieces 12 takes place through the grinding unit 13, is enclosed in the grinding chamber 16, so that the outer chamber 17 and the surroundings of the grinding machine 1 are substantially sealed against grinding dust, abrasive particles, sparks, exhaust air and / or cooling liquid.
  • the environment of the grinding machine 1 is still substantially sealed against grinding dust, abrasive particles, sparks, exhaust air and / or coolant, as long as the outer doors 19 are closed.
  • the method steps of positioning 1002 the shielding device 38 and the closing 1003 of the intermediate door 18 can also be performed in reverse order or simultaneously.
  • the three chambers are preferably run in the reverse order.
  • the outer doors 19, intermediate doors 18 and the shielding device 38 in particular depending on the position of the loading plate 11, coordinated with each other time-shifted opened or closed or positioned, whereby the fastest possible method 1001, 1006 of the loading plate 11 and a short changeover of the Grinding machine can be achieved.
  • the shielding device 38 shields the intermediate chamber 37 from the discharge of grinding dust, abrasive particles, sparks, exhaust air and / or cooling liquid from the upper grinding chamber 15a.
  • the closed intermediate chamber 37 prevents grinding dust, abrasive particles, sparks, exhaust air or cooling liquid from the lower grinding zone 15b from leaving the grinding machine 1.
  • the cooling air supply to first cooling devices 20, which may be provided on or in the closed intermediate doors 18, could be by opening cooling air supply doors 30 in the supply system, ie by controlling the angle of attack of the flaps relative to the intended flow direction of the cooling fluid , switched on or increased.
  • the grinding 1004 may be divided into a rough grinding 1004 a and a fine grinding 1004 b, wherein possible parameters to produce a coarser or finer grinding surface on the workpiece 12, a different speed of delivery of the grinding wheels 14, and thus more or less abrasion on the workpieces 12th , and / or rotational speeds of the loading plate 11 and / or grinding wheels 14 include.
  • rough grinding 1004a a lot of grinding dust, sparks and / or spent cooling liquid, which already remain mainly within inner chamber 36 due to the shielding device 38, remain within the intermediate chamber 37 due to the closed intermediate doors 18.
  • Suction of grinding dust from the grinding machine 1 takes place together with injected cooling air through a suction opening 33.
  • the workpieces 12 may be provided with a reduction 1009 or switching off the cooling air supply to the first cooling device 20, but possibly also to the second, third, fourth and / or fifth cooling devices 21, 22, 23, 50 preferably by closingde Kunststoffzufar Kunststoffklappen 30, prevents that takes place during the fine grinding 1004 b unnecessary cooling, which would require unnecessary energy or in the process 1006 of the loading plate 11 with the ground workpieces 12 in a loading position L cooling air unnecessarily from the feed openings 175 in the outer chamber 17 or Intermediate chamber 37 is blown.
  • an opening 1005 of the pivotable intermediate doors 18 may already take place (variant A, FIG. FIG. 7 ). Due to the fact that outer doors 19 can be closed at this time, the occupational safety is given insofar as the grinding zone 15, in particular rotating parts such as loading plates 11 and / or grinding wheels 14, are not freely accessible from outside the grinding machine 1.
  • the grinding zone 15 is further enclosed by the closed outer doors 19, so that grinding dust, sparks, exhaust air or coolant can not penetrate to the outside substantially.
  • the shielding device 38 restricts its propagation, at least from the upper grinding zone 15a, also during the fine grinding 1004b to the area within the inner chamber 36.
  • a method 1006 of the loading plate 11 with the ground workpieces 12 past the opened intermediate doors 18 and through an open outer door 19 into a loading position L by rotation of the turntable 10 can take place.
  • the loading plate 11 with workpieces 12, in particular a workpiece upper edge 121 pass by a lower end of the cooling device 21, in particular its lower edge 219 of the discharge device 211, because the Outflow device 211 is not in an upper position OP in the movement path of the loading plate 11.
  • the lowering 1010 and lifting 1011 can be carried out together with the positioning 1002 of the shielding device 38, in particular by the activation of common drives.
  • the loading plate 11 comes by the method 1001 by rotation of the turntable 10 in a grinding position S. In this position fall the inflow openings 222 of a third cooling device 22, which mounted on the turntable 10 is, with feed ports 175 in an outer chamber 17 together. This results in a continuous duct for cooling air from a cooling air supply device 27 to outflow openings 224 of the third cooling devices 22. Due to an increase 1008 of the cooling air supply to the cooling devices 22, preferably by openingde Kunststoffzuschreibklappen 30, a equipped with workpieces 12 loading plate 11, in particular by Nozzle 225 for cooling air, which may be provided in the outflow openings 224, cooled.
  • cooling air may be unnecessarily prevented from the supply openings 175 is blown into the outer chambers 17 or the grinding chamber 16.
  • 1006 of the loading plate 11 that is, a rotation of the turntable 10
  • the inflow openings 222 are not in registration with supply openings 175.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP15162107.5A 2014-04-01 2015-03-31 Refroidissement à air de meules et plateaux de rectifieuses à ressort (système à 3 chambres) Active EP2926949B1 (fr)

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EP3597362A1 (fr) 2018-07-16 2020-01-22 Officina Meccanica Domaso SpA Rectifieuse d'extrémités de ressorts
CN116038457A (zh) * 2022-12-26 2023-05-02 浙江金昌弹簧有限公司 一种具有翻料承载装置的磨簧机

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JP6563606B2 (ja) * 2017-07-18 2019-08-21 株式会社紀和マシナリー 工作機械
CN108818184B (zh) * 2018-08-15 2023-09-01 浙江家度弹簧机械有限公司 一种卸簧机构
EP3659743B1 (fr) * 2018-11-27 2020-11-11 Schwäbische Werkzeugmaschinen GmbH Engin porteur pivotant double à deux tables pivotantes pourvues de zones de pivotement se chevauchant mutuellement ainsi que procédé d'usinage correspondant
CN111922818A (zh) * 2020-08-20 2020-11-13 上海远葆工业设计有限公司 一种板材抛光方法及加工设备

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JP2927100B2 (ja) * 1992-04-23 1999-07-28 ブラザー工業株式会社 工作機械
DE19907617C2 (de) * 1999-02-23 2002-06-20 Schwaebische Werkzeugmaschinen Werkzeugmaschine mit Doppelschwenktisch
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3597362A1 (fr) 2018-07-16 2020-01-22 Officina Meccanica Domaso SpA Rectifieuse d'extrémités de ressorts
EP4234162A1 (fr) 2018-07-16 2023-08-30 OFFICINA MECCANICA DOMASO S.p.A. Rectifieuse d'extrémités de ressorts
CN116038457A (zh) * 2022-12-26 2023-05-02 浙江金昌弹簧有限公司 一种具有翻料承载装置的磨簧机
CN116038457B (zh) * 2022-12-26 2023-08-22 浙江金昌弹簧有限公司 一种具有翻料承载装置的磨簧机

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EP2926949A3 (fr) 2015-11-11
EP2926948B1 (fr) 2024-03-13
EP2926948A1 (fr) 2015-10-07
EP2926948B9 (fr) 2024-07-10

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