EP1144138A2 - Method for grinding at least one surface on a cutting knife used in machining, use of said method and grinding wheel used to carry out said method - Google Patents
Method for grinding at least one surface on a cutting knife used in machining, use of said method and grinding wheel used to carry out said methodInfo
- Publication number
- EP1144138A2 EP1144138A2 EP99932711A EP99932711A EP1144138A2 EP 1144138 A2 EP1144138 A2 EP 1144138A2 EP 99932711 A EP99932711 A EP 99932711A EP 99932711 A EP99932711 A EP 99932711A EP 1144138 A2 EP1144138 A2 EP 1144138A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding wheel
- grinding
- cutting knife
- knife
- wheel
- 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
Links
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
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/34—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of turning or planing tools or tool bits, e.g. gear cutters
- B24B3/346—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of turning or planing tools or tool bits, e.g. gear cutters of gear shaper cutter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
Definitions
- the invention relates to a method for grinding at least one surface on a cutting knife used in machining technology with a grinding wheel rotating about an axis, the working area of which is an annular surface, an advantageous use of the method and a grinding wheel for carrying out the method.
- a method of the type mentioned is known from US 5 168 661.
- spiral grooves that are created on the workpiece surface by the grain protruding the highest from the grinding wheel should be avoided.
- a grinding wheel is used which has a narrow, essentially flat surface for finish grinding on the outer part of the wheel surface, which surface is held essentially tangential to a surface of a workpiece during the finishing grinding.
- the grinding wheel consists of an expensive, extremely durable grinding material such as CBN crystals, but other materials such as aluminum oxide can also be used, since the grinding wheel does not need to be dressed.
- the grinding wheel has an inner conical surface that is used for rough grinding. The roughed knife surface is then finished with the narrow, flat surface.
- This known method requires a complicated movement sequence, because each surface to be ground on a cutting knife is first roughed with the inner conical surface and then finished with the narrow, flat surface.
- the grinding wheels used in the known method consist of grinding materials with different grain size in their roughing and finishing area. The grinding and finishing work to be carried out by the grinding wheel is thus divided into two different grinding wheel areas, one of which is used only for rough grinding and the other only for finishing grinding.
- the cutting knives which are ground by the known method, are the usual high-speed steel knives.
- Another disadvantage of the known method is that finish grinding of concavely curved surfaces is not possible because the finish is always carried out with the narrow flat surface.
- carbide knives cannot be ground due to the CBN discs used. A CBN disc would not have sufficient stability when machining hard metal knives. Tungsten carbide knives cannot be shaped easily. A wide diamond wheel would be required for carbide knives for shape grinding, but these diamond wheels are very difficult to condition.
- the object of the invention is to provide a method of the type mentioned at the outset which enables a simpler workflow and the use of a grinding wheel with a simpler configuration and in particular also permits the grinding of curved surfaces.
- an advantageous use of the method and a grinding wheel for carrying out the method are to be specified.
- a universal grinding wheel can be used in the method according to the invention, the working area of which is an annular surface which has an arcuate profile in axial section.
- a surface on the cutting knife is first grinded by the ring surface under a first spatial orientation between the grinding wheel and the cutting knife by at least one generated first translational relative movement between the grinding wheel and cutting knife, and then at least a part of the generated surface with the ring surface is ground with a second spatial orientation between the grinding wheel and cutting knife by at least a second translational relative movement between the grinding wheel and cutting knife.
- a surface can be ground with one area of the ring surface and then this surface can be ground with another area of the ring surface.
- the grinding wheel used in the method according to the invention does not need to have different specifications in these two areas, because just by appropriately selecting the parameters, coupled with the two different spatial orientations, the same surface of the cutting knife can be ground and then ground, for example Rough and finishing grinding, regardless of whether the finished surface is flat, convex or concave.
- the grinding wheel used in the method according to the invention only needs to have a radius in its working area and therefore has a much simpler configuration than the grinding wheel used in the known method.
- the course of the method is also much simpler in the method according to the invention than in the known method because only two different spatial orientations can be selected, for example by choosing a different angle for the cutting knife with respect to the grinding wheel.
- the method according to the invention is thus considerably more flexible in use than the known method.
- the spiral grooves, which are avoided in a complex manner by the known method, are also avoided by the method according to the invention, without it being necessary to use a grinding wheel with a narrow, flat surface for finish grinding.
- the grinding wheel for carrying out the method is a diamond cup grinding wheel with a working area which lies partly in an end region and partly in a cylinder region of the cup grinding wheel.
- This offers the advantage that either flat or curved surfaces (with the end region) or concave surfaces (with the cylinder region or the end region) can be ground, depending on the spatial orientation between the grinding wheel and the cutting knife.
- the wear behavior is better and the wheel geometry is more stable.
- the diameter of the so-called profiling point which can be precisely determined, does not change during a technological phase compared to a CBN grinding wheel. Compensation for the position of the diamond grinding wheel is therefore not necessary.
- a knife shoulder in which the oversize is larger, can be produced in a separate technological phase, which contributes to increasing the efficiency of the process.
- the cutting knives to be ground using the method according to the invention can consist of different types of hard metal.
- a knife flank produced with the grinding wheel according to the invention can consist of one or more geometric surfaces.
- the surface and flank shape is created by the relative positioning of the grinding wheel and cutting knife.
- the cylinder area creates the grinding wheel a concave surface
- the end region can produce a curved or a flat surface. Therefore, the knife flank can consist of two or more than two different surfaces (eg a concave surface with a larger clearance angle and a flat facet with a smaller clearance angle).
- the first spatial orientation between the grinding wheel and the cutting knife is achieved by adjusting a first position of the cutting knife in relation to the grinding wheel and the second spatial orientation between the grinding wheel and cutting knife by adjusting a second position of the cutting knife in relation to the grinding wheel is achieved
- a conventional grinding machine can be used, in which the grinding wheel is rotatable about its own axis and vertically movable in the Y-axis.
- the first position of the cutting blade is in a further advantageous embodiment of the method according to the invention chosen such that the grinding wheel generates the surface on the • cutting blades with a port in a cylinder area of the grinding wheel first surface element of the annular surface, and the second position chosen of the cutting blade so If the grinding wheel grinds over at least a part of the area produced on the cutting knife with a second surface element of the ring area located in an end area of the grinding area, then the concave surface produced with the cylinder area can optionally be grinded over with the end area so that the area created remains concave or becomes flat or at least partially flat.
- the second position of the cutting knife is selected such that the grinding wheel covers the at least part of the area generated generated on the cutting blade as a concave or 'planar facet, only the spatial orientation between the grinding wheel and the cutting blade needs to be selected accordingly.
- the removal takes place only by infeed in a Y axis of the machine when generating a surface on the cutting knife, the generation grinding process can be controlled in a simple manner.
- the generation of the surface on the cutting knife takes place only with three mutually perpendicular linear axes and other axes are used as mere adjustment axes and are positioned on the cutting knife before the actual generation grinding of the surface, can be carried out by three controlled linear movements any desired area on the cutting knife on a conventional grinding machine such as a B22 grinding machine from the applicant (see company brochure "CNC Tool Grinding Cell Oerlikon B22", OGT-B22 / D / hJ) or type B5 from the applicant (cf. both Company brochures each with the designation "profil B 5", K 1.11 - d / e - cH or OGT-profil B5 / E / dH).
- a conventional grinding machine such as a B22 grinding machine from the applicant (see company brochure "CNC Tool Grinding Cell Oerlikon B22", OGT-B22 / D / hJ) or type B5 from the applicant (cf. both Company brochures each with the designation "profil B 5", K 1.
- the surface on the cutting knife is generated in one and / or in the other step in two passes by two first or second translational relative movements between the grinding wheel and the cutting knife, the surface can be in each case two steps roughing and finishing.
- the grinding process can be controlled in terms of geometry and technology in the usual way.
- a CDS computing system CDS is the abbreviation for Controlled Disk System
- a special program package is required in order to use a conventional grinding machine , for example of the above-mentioned type B22, to convert to the generation loop according to the invention.
- each surface on the cutting knife is produced in one step with at least one roughing cut and the at least part of the generated surface is ground with a finishing cut in the other step, each surface can be generated separately and influence the surface macro and micro geometry of the surface separately.
- the translational relative movement between the grinding wheel and the cutting knife is generated by giving the cutting knife a pushing or pulling movement relative to the grinding wheel, the desired simple workflow can be achieved by appropriate selection of this movement.
- the cutting knife is given a pulling movement relative to the grinding wheel with a finishing cut, this is the preferred workflow, but depending on the surface to be ground, instead of the pulling movement, an impact movement for the Finishing cut can be advantageous.
- Each technological phase roughing or finishing
- the roughing cut and finishing cut are advantageously selected solely by selecting feed parameters such as feed direction and speed.
- the working area is an annular surface which has an arcuate profile in axial section that extends over an overall contact angle, the roughing and finishing work areas of the grinding wheel can be shifted against one another within this working area by choosing different profile tilt angles or even separate.
- the part of the working area used can be selected in the end area and / or cylinder area of the grinding wheel.
- the arcuate profile is circular and has a radius of curvature which is in a range from 0.5 to 5 mm and preferably from 0.5 to 1 mm and most preferably 0.5 mm or less there are flexible options for processing the cutting knife.
- the grinding wheel according to the invention has a fixed geometry and cannot be dressed, its manufacture is particularly simple. It is much easier to just go with a certain radius IG
- Grind if the radius is kept constant, which is the case with diamond grinding wheels that have a long service life. It can be assumed that the method is carried out with a constant radius, which simplifies and simplifies the control of the process.
- the question of whether a dressable or non-dressable grinding wheel is used depends on the grinding ability of the grinding wheel.
- a non-dressable grinding wheel preferably consists of a metallic carrier body to which an abrasive coating made of diamond grains and a galvanic bond from which the diamond grains protrude is applied, the galvanic bond preferably consisting of nickel.
- a dressable grinding wheel can also be used. This is easily possible due to the construction of the type B22 machine, because the machine has a suitable dressing device and suitable dressing software is provided in order to be able to dress the grinding wheel occasionally in order to profile its radius again.
- FIG. 2 shows a schematic illustration of a cup grinding wheel for the method according to the invention
- FIG. 4 is an enlarged detail of the working area of the grinding wheel according to the invention, 5a-5c three different types of knives which can be grinded by the method according to the invention on a machine according to FIG. 1, the arrangement of the cutting knife in a knife head on the left and the arrangement of the cutting knife in the clamping device of the grinding machine on the right,
- 6a shows the division of the cuts on a cutting knife with different abrasion on the knife shoulder and tip
- FIG. 8 shows the use of the method according to the invention for finishing the same area as in FIG. 7,
- a knife grinding machine of the applicant's type B20 designated overall by reference number B22, which is actually intended for grinding bar knives with profiled disks in the form grinding process, but here has an extension for grinding cutting knives, in particular hard metal knives, in the production process.
- the extension consists primarily of an extension of the software for controlling the knife grinding machine 20, in particular in the area of the adaptation control (PMC), the machining cycles and macros of the CNC, the user interface and the data management with an integrated PC.
- the CNC has the function of the "master” and is used for axis control, for executing the part programs (process sequence control), the part program management and for CNC screen displays.
- the adaptation control takes over the interface function between the CNC and the knife grinding machine, the control of machine processes, monitoring functions, machine control panels, digital input / output and interface to the robot / magazine. Because of the available resources (RAM in the PC), a program is created for each of the two grinding processes (form and production grinding) created for the user interface. The change between the user interface for form or production loops can be carried out during the startup of the PC software.
- the knife shape is only generated with the linear axes X, Y, Z.
- An A and a C axis are pure adjustment axes and are positioned before the actual grinding of the knife surfaces.
- the path calculation and the cutting division take place in the PC, so that only macros and cycles for workpiece change and conditioning of the grinding wheel have to be available on the CNC level.
- the main interpolation plane for grinding the cutting knives is formed by the axes Y and Z.
- the workpiece spectrum comprises cutting knives 22, of which three different types are shown in FIGS. 5a-5c.
- the structural geometry and the arrangement in a cutter head 24 are different for the three cutter types, and consequently the three cutter types are ground in three different clamping devices 26,
- Fig. 5a shows a clearance angle of 8 ° on the left and a cutter inclination angle of 20 ° in the cutter head.
- the cutting knife 22 in FIG. 5a on the right in the clamping device 26 must have an inclination angle of 28 ° so that the head of the knife is arranged for grinding without a clearance angle.
- FIGS. 5b and 5c The angles given on the far left and top left in FIGS.
- a axis of the knife grinding machine 20 shown in FIG. 1 An important prerequisite for the method described here, which has been developed in particular for hard metal grinding, is the properties of the A axis of the knife grinding machine 20 shown in FIG. 1.
- the A axis is only used for device positioning and is then clamped .
- the head radius is generated by at least two translational movements (Y, Z). These translational movements are described in more detail below with reference to FIGS. 7-15.
- the generation grinding method described here is carried out with a grinding wheel 28, which is preferably a diamond cup grinding wheel.
- the grinding disc 28 is shown schematically in axial section in Fig. 2 and in an enlarged partial view in the working position in Fig. 3. In the embodiment shown in FIG.
- the grinding wheel 28 consists of a carrier body 30 made of steel, to which an abrasive coating 32 made of grain and galvanic bond is applied.
- the galvanic bond consists of nickel, which was electrolytically deposited on the carrier body 30 made of steel in galvanic baths.
- the diamond grains protrude from the bond after the galvanic treatment is complete.
- a dressable grinding wheel could be bound with synthetic resin.
- FIG. 4 shows a further enlarged work area 34.
- the grinding wheel 28 has a grinding or rounding radius R.
- a part 34 'of the working area 34 lies in a front area and a part 34' 'of the working area 34 lies in a cylinder area of the grinding wheel 28.
- the grinding wheel 28 has a fixed geometry and cannot be dressed . When the tool life is at an end, the work area 34, i.e. the active surface of the grinding wheel can be occupied again.
- the grinding wheel 28 has the grinding or rounding radius R on the grinding edge, a wheel radius SR up to a tangent to the grinding edge, a wheel height SH from a spindle contact surface 36 to a tangent to the grinding edge, an inside angle IW an inner surface (cone) 40 to the axis 38 of the grinding wheel 28 and an outer angle AW of an outer surface (cone) 42 to the axis 38.
- the working area 34 of the grinding wheel 28 is an annular surface which, as shown in FIG The end region extends to a point 46 in the cylinder region of the grinding wheel 28 and, in the axial section shown in FIG. 4, has an arcuate profile which extends over an overall contact angle GKW which is shown in FIGS.
- the total contact angle GKW is about 145 °.
- the arcuate profile is arcuate, and the radius of curvature is in a range from 0.5 to 5 mm and preferably from 0.5 to 1 mm.
- the grinding wheel has one and the same grinding covering in the entire working area 34, i.e. the different parts of the work area do not have to be coated differently in order to be used for roughing or finishing.
- the coating limits of the working area 34 are designated in the illustration in FIG. 4 with 48 or 50, the respective overhang beyond which the coating limit extends beyond the actual working area with 52 or 54.
- the angle within which the grinding wheel 28 with the Head of the cutting knife 22 can come into contact during grinding, is referred to as the head contact angle KKW.
- the head contact angle for the use of the grinding wheel 28 during roughing corresponds to the part 34 ′′ of the working area, and that for the finishing to the part 34 ′ of the working area, as shown in FIG. 4. The use of these different parts of the work area for roughing and finishing is explained in more detail below.
- a cutting knife to be ground has three active surfaces, namely two open surfaces 56 (only one of which is visible in FIG. 5a) and a rake surface 58. These three surfaces can be defined separately on the knife grinding machine 20 and then ground separately. Each free area can consist of two different areas (with two different clearance angles and with two geometries).
- the technological process can include several roughing and finishing cut ⁇ . Each technological phase (roughing or finishing) or sparking can be defined separately.
- FIGS. 13, 14 and 15 the roughing and the finishing ⁇ technology represented schematically.
- the cutting knife 22 is turned by a profile tilt angle PK tilted so that the working area 34 is brought into contact with the cylinder area of the grinding wheel 28.
- the free surface of the cutting knife generated in this way becomes concave on the flank and cylindrical at the head of the cutting knife 22.
- the "roughing free surface” is ground with a larger clearance angle than the "finishing free surface”. 13 and 14 it can be clearly seen that the total contact angle GKW depends on the profile tilt angle PK.
- the profile contact angle PKW is in a range from alpha to 90 ° - alpha.
- the different parts 34 ', 34''of the working area 34 of the grinding wheel 28 are brought into contact with the cutting knife 22. In this way, the roughing and finishing parts of the working area 34 of the grinding wheel 28 can be moved relative to one another or even separated from one another.
- the grinding wheel 28 processes the flank of the cutting knife 22, in which the generatrix is an arc in one plane. A flat or cylindrical facet is created on the flank, the width of which can be calculated. Only at the head of the cutting knife 22 is no theoretically exact cylinder produced, but there will be a correct cutting edge.
- the "finishing clearance angle" is set smaller than for roughing, and the two different surfaces are created in this way. The value of the "finishing clearance angle" must of course be correct for the machining process.
- the different areas 34 ′′ and 34 ′ of the grinding wheel 28 are stressed by different positioning of the cutting knife 22 during roughing and finishing, which will lead to an increase in tool life. If the profile tilt angle PK smaller than 90 ° - alpha, there is always an overlap between roughing and finishing.
- Fig. 6 shows the cut distribution for a knife processing, in which the removal takes place only by infeed in the knife axis.
- the removal on the knife shoulder and on the knife tip is significantly greater than on the side surfaces. If it is necessary due to the grinding technology that the removal is approximately constant, a suitable cut distribution must be calculated. Additional intermediate positions must then be implemented in the correct order in a CNC part program with the correct chronological sequence of the grinding operations. The additional grinding operations are marked gray in Fig. 6b.
- the cutting knife which is clamped in the clamping device 26 (see FIG. 5a) not shown in FIGS. 7 and 8, is used to move to positions which are designated by 0-14. 7 shows the first pass on the left and the second pass on the right.
- the grinding wheel 28 maintains its position in each case, and the represented positions are approached with the cutting knife 22 itself, although the illustration in FIGS. 7 and 8 is selected as if the grinding wheel 28 were being moved.
- this can only perform a movement in the Y axis.
- the movements in the X, Z and, if necessary, in the Y axis are carried out by the clamping device 26, in which the cutting knife 22 is clamped.
- the dashed arrows indicate rapid traverse, the solid arrows indicate feed. 13
- the polygon point that is still approached in rapid traverse is designated by 1.
- 2-6 are the path points of the first pass that are approached with feed.
- Points 7 and 8 are intermediate points that are approached in rapid traverse.
- Points 9-14 are path points of the second pass, which are approached with feed. From point 14 the retraction to the standard position takes place in rapid traverse.
- 0 is again the starting position, which can be approached from a standard position without a collision.
- 1 is the first railway point that is still approached in rapid traverse.
- 2-6 are the path points that are approached with feed. From point 6 the retraction to the standard position takes place in rapid traverse.
- 9-12 show how the operations shown schematically in FIGS. 7 and 8 are actually carried out on the knife grinding machine 20.
- the cutting knife 22 is set so that the grinding wheel 28 with the part 34 ′′ of its working area located in the cylinder area grinds a surface (A) of the cutting knife 22, namely roughing, starting from a shoulder 21 to a head 23 of the cutting knife 22.
- the other surface (B) of the cutting knife 22 is ground with the part 34 ′′ of the working area located in the cylinder area, that is to say also roughed.
- the surface of the cutting knife 22 previously machined by rough grinding is then brought into a vertical position in which it is tangential to the end region of the grinding wheel 28. In this position, this surface of the cutting knife 22 is finished.
- the setting of the knife with respect to the grinding wheel movable in the Y-axis will now be described in detail with reference to FIGS. 13-15. Of the grinding wheel 28, only the grinding edge is in each case in FIGS. 13-15
- Circle indicated which corresponds to the circle shown in Fig. 4 at the cutting edge.
- the grinding wheel which is not otherwise shown, has the same orientation as in Fig. 4, i.e. its end face extends vertically and the axis of rotation is horizontal.
- the roughing and finishing technology are shown schematically.
- the cutting knife 22 is tilted by the profile tilt angle PKW, so that the profile is brought into contact with the cylinder region of the grinding wheel 28. In this way, a free area is generated which is concave on the flank and is cylindrical on the head 23 of the cutting knife 22.
- the "roughing surface” is preferably ground with a larger clearance angle than the "finishing surface”. 13 and 14 it can clearly be seen that the total contact angle GKW is dependent on the profile tilt angle PKW, as already explained above.
- the grinding wheel 28 processes the flank of the cutting knife with its end face, in which the generatrix is an arc in one plane, as also already explained.
- a surface on the cutting knife 22 is created by grinding with the ring surface under a first spatial orientation between the grinding wheel 28 and the cutting knife 22 by at least a first translational relative movement between the grinding wheel and the cutting knife, as is the case for a surface e.g. is shown in Fig. 11, and
- the first and the second spatial orientation between the grinding wheel 28 and the cutting knife 22 are achieved by adjusting a first and second position of the cutting knife 22 with respect to the grinding wheel 28.
- the grinding wheel 28 produces the at least part of the area generated on the cutting knife 22 as a concave or even facet.
- the removal is expediently effected only by infeed in a knife axis. It is essential to the invention that only translatory relative movements are carried out between the cutting knife 22 and the grinding wheel 28. Neither the grinding wheel 28 nor the cutting knife 22 needs to be rotated during the machining of the knife, of course apart from the rotation of the grinding wheel about 28 about its own axis 38.
- the surface on the cutting knife 22 can be in step a) and / or in step b) is produced in two passes by two first or second translational relative movements between the grinding wheel 28 and the cutting knife 22. It has already been explained above that the method is preferably carried out on a CNC machine and that a CDS computing system is used to determine interrelationships between geometric and technological parameters for the generation grinding. It was further described above using an example that the surface on the cutting knife 22 in step a) is produced in two passes, that is to say with two roughing cuts. However, it is clear that at least one rough cut is sufficient. The at least part of the surfaces generated is then ground in step b) with a finishing cut.
- the translational relative movement between the grinding wheel 28 and the cutting knife 22 is generated in that the cutting knife 22 relative to the grinding wheel 28 has an impact movement (as shown for example in FIGS. 13 and 14) or a pulling movement (as shown for example in FIG. 15). is given.
- the particular advantage of grinding wheel 28, which is used in the method described here, is that the grinding wheel has the same specifications in its entire ring surface used for grinding, that is to say that the grinding wheel has, for example, one and the same grinding covering in the entire working area, and that the selection of roughing cut and finishing cut is made solely by selecting feed parameters such as feed direction and speed, cutting speed and oversize.
- the surface elements of the ring surface which are used in steps a) and b) for roughing or finishing, are interchangeable.
- the method described here is preferably used to grind hard metal knives using a diamond cup grinding wheel.
- the grinding wheel 28 can be dressable or non-dressable. If a dressable grinding wheel is used, the dressing could be carried out in the following ways:
- Dressing with a contour roller 68 which has a contour similar to that which is usually used.
- the contour roller 68 must be used to trace a contour around the window profile.
- the controller must be informed that the dressing device (contour roller 66 or 68) has been set up for the diamond cup grinding wheel, so that software limit switches can then be activated and additional monitoring and plausibility checks can be carried out with regard to the grinding process.
- 16a schematically shows the conditioning with the contour roller 66 and with linear interpolation when approaching the grinding wheel contour.
- 16b shows the conditioning with the contour roller 68 by interpolation around the grinding wheel contour. In both cases, the conditioning process can take place at different relative speeds of the points of contact between the cup wheel and the dressing tool in order to achieve the desired surface quality or abrasion capacity of the grinding wheel 28.
- the actual dressing process will be a cycle stored in the CNC, which accesses the data from the tool database.
- the conditioning process according to FIG. 16b can be carried out if the condition for the radii and the steepness of the cone is fulfilled. Then there is a theoretically punctiform contact between the grinding wheel 28 and the dressing roller 68.
- the dressing cycle must be designed so that a dressing roller with a cylindrical part and one radius each can be attached to the edge.
- the optimization that is carried out in the generation grinding method described here can consist, for example, in that the force on the grinding surface remains constant.
- the grinding wheel manufacturer usually recommends a certain cutting performance that should be maintained.
- the user then has the option of adapting the knife surfaces to be ground.
- a controlled cut distribution as described above with reference to FIGS. 6a and 6b, enables a better optimization of the grinding process, namely constant power or forces, production of a desired facet width, etc.
- a further optimization consists in the fact that the ground surface can be either flat or concave in the final state and that each free surface itself can consist of a combination of two free surfaces.
- each free surface itself can consist of a combination of two free surfaces.
- a surface is first made on a cutting knife by grinding with the annular surface under a first spatial orientation between the grinding wheel and cutting knife by at least a first translational relative movement generated between them and then at least a portion of the generated area with the annular surface is ground with a second spatial orientation between the grinding wheel and the cutting knife by at least one second translational relative movement between them.
- the grinding wheel is a diamond cup grinding wheel.
- the working area lies with a part in a front area and with another part in a cylinder area of the grinding wheel. One part is used for rough grinding and the other part is used for finish grinding the surface to be produced on the cutting knife.
- the grinding wheel has one and the same grinding covering in the entire working area. Roughing and finishing are carried out using areas of the grinding wheel that have the same specifications, but with different grinding parameters.
- the spatial orientation between the grinding wheel and the cutting knife is preferably selected by adjusting the cutting knife in relation to the grinding wheel. The method allows surfaces to be created on a cutting knife that can be flat and / or concave, enables a simpler workflow and the use of a grinding wheel with a simpler configuration than in the prior art.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19827897 | 1998-06-23 | ||
DE19827897A DE19827897A1 (en) | 1998-06-23 | 1998-06-23 | Procedure for grinding at least one surface on cutting blade used in machining |
PCT/EP1999/004327 WO1999067036A2 (en) | 1998-06-23 | 1999-06-22 | Method for grinding at least one surface on a cutting knife used in machining, use of said method and grinding wheel used to carry out said method |
Publications (3)
Publication Number | Publication Date |
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EP1144138A2 true EP1144138A2 (en) | 2001-10-17 |
EP1144138B1 EP1144138B1 (en) | 2002-11-06 |
EP1144138A3 EP1144138A3 (en) | 2002-12-18 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP99932711A Expired - Lifetime EP1144138B1 (en) | 1998-06-23 | 1999-06-22 | Method for grinding at least one surface on a cutting knife used in machining, use of said method and grinding wheel used to carry out said method |
Country Status (6)
Country | Link |
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US (1) | US6712675B1 (en) |
EP (1) | EP1144138B1 (en) |
JP (1) | JP4450993B2 (en) |
AU (1) | AU4900299A (en) |
DE (2) | DE19827897A1 (en) |
WO (1) | WO1999067036A2 (en) |
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JP2005516782A (en) * | 2002-02-07 | 2005-06-09 | ザ グリーソン ワークス | How to grind a cutting blade |
DE10214792B4 (en) * | 2002-04-04 | 2004-05-06 | Saint-Gobain Winter Diamantwerkzeuge Gmbh & Co. Kg | Process for grinding profiles on workpieces |
DE10324432B4 (en) * | 2003-05-28 | 2005-06-02 | Klingelnberg Ag | Profile sharpened bar knife for the production of bevel and hypoid gears and method for profile sharpening of such a bar knife |
JP4550773B2 (en) | 2006-06-05 | 2010-09-22 | 株式会社三井ハイテック | Profile grinding machine |
EP2161092B1 (en) * | 2008-09-04 | 2012-04-18 | GLEASON-PFAUTER, Maschinenfabrik GmbH | Gear grinder and method for dressing a grinding tool |
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DE3416441C2 (en) | 1984-05-04 | 1986-04-10 | Georg Karstens GmbH Fabrik für Meßgeräte und Spezialmaschinen, 7302 Ostfildern | Plunge-cut grinding process |
JPH01502729A (en) * | 1987-03-13 | 1989-09-21 | ザ グリーソン ワークス | Method and apparatus for dressing a rotating dressing roller and a cup-shaped polishing wheel |
US5033237A (en) * | 1990-02-08 | 1991-07-23 | Kobelco Compressors (America), Inc. | Method of numerically controlled profile grinding |
US5168661A (en) | 1990-05-30 | 1992-12-08 | The Gleason Works | Method of grinding the surfaces of cutting blades and grinding wheel therefor |
US5241794A (en) * | 1990-05-30 | 1993-09-07 | The Gleason Works | Grinding wheel for cutting blades |
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US5305558A (en) * | 1993-02-26 | 1994-04-26 | The Gleason Works | Method of sharpening profile-sharpened cutting blades |
US5503588A (en) * | 1993-06-30 | 1996-04-02 | The Gleason Works | Method of sharpening cutting blades |
-
1998
- 1998-06-23 DE DE19827897A patent/DE19827897A1/en not_active Withdrawn
-
1999
- 1999-06-22 AU AU49002/99A patent/AU4900299A/en not_active Abandoned
- 1999-06-22 JP JP2000555710A patent/JP4450993B2/en not_active Expired - Lifetime
- 1999-06-22 WO PCT/EP1999/004327 patent/WO1999067036A2/en active IP Right Grant
- 1999-06-22 DE DE59903360T patent/DE59903360D1/en not_active Expired - Lifetime
- 1999-06-22 EP EP99932711A patent/EP1144138B1/en not_active Expired - Lifetime
- 1999-06-22 US US09/720,641 patent/US6712675B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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See references of WO9967036A2 * |
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EP1144138A3 (en) | 2002-12-18 |
JP4450993B2 (en) | 2010-04-14 |
DE19827897A1 (en) | 1999-12-30 |
EP1144138B1 (en) | 2002-11-06 |
US6712675B1 (en) | 2004-03-30 |
WO1999067036A2 (en) | 1999-12-29 |
AU4900299A (en) | 2000-01-10 |
JP2003516237A (en) | 2003-05-13 |
DE59903360D1 (en) | 2002-12-12 |
WO1999067036A3 (en) | 2002-10-31 |
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