EP2646652B1 - Chisel holder - Google Patents

Chisel holder Download PDF

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Publication number
EP2646652B1
EP2646652B1 EP11788888.3A EP11788888A EP2646652B1 EP 2646652 B1 EP2646652 B1 EP 2646652B1 EP 11788888 A EP11788888 A EP 11788888A EP 2646652 B1 EP2646652 B1 EP 2646652B1
Authority
EP
European Patent Office
Prior art keywords
plug
projection
abutting surfaces
bit holder
holder according
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.)
Active
Application number
EP11788888.3A
Other languages
German (de)
French (fr)
Other versions
EP2646652A2 (en
Inventor
Thomas Lehnert
Karsten Buhr
Cyrus Barimani
Guenter Haehn
Martin Lenz
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.)
Wirtgen GmbH
Original Assignee
Wirtgen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE102010061019A external-priority patent/DE102010061019A1/en
Priority claimed from DE201110051523 external-priority patent/DE102011051523A1/en
Application filed by Wirtgen GmbH filed Critical Wirtgen GmbH
Publication of EP2646652A2 publication Critical patent/EP2646652A2/en
Application granted granted Critical
Publication of EP2646652B1 publication Critical patent/EP2646652B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
    • E01C23/088—Rotary tools, e.g. milling drums
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements
    • E21C35/1933—Means for fixing picks or holders using bolts as main fixing elements the picks having a cylindrical shank
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements

Definitions

  • the invention relates to a chisel holder for a soil cultivation machine, in particular a road milling machine with a support body to which a plug-in attachment is connected directly or indirectly to one plug-in attachment side, the plug-in attachment having at least one convex contact surface and a pressure surface.
  • Such a chisel holder is from EP 0 771 911 A1 known.
  • the chisel holder has a plug-in attachment with a frusto-conical outer geometry.
  • the chisel holder can be inserted with the plug-in attachment in a base part that is attached to the surface of a milling drum tube.
  • a pressure screw is used that acts on the plug-in attachment.
  • the plug-in attachment is clamped in a receiving bore of a chisel holder with the pressure screw.
  • high machining forces are diverted into the base part via the chisel holder.
  • the round shaft cross-section of the plug-in attachment prevents forces from being transmitted in the circumferential direction of the plug-in attachment.
  • Chisel holders are therefore used which allow a certain readjustment of the chisel holder in the base part even in the event of wear, in order to achieve a long service life.
  • Such a chisel holder is in the DE 43 22 401 A1 shown.
  • a pentagonal plug-in attachment is inserted into a correspondingly configured plug-in receptacle of a base part.
  • the chisel holder is supported with a support surface of its support body on a counter surface of the base part in order to be able to dissipate a large part of the stresses.
  • transverse forces occurring during the machining process are introduced into the base part via the plug-in attachment.
  • this also creates torsional stresses in the plug-in attachment. This results in a multiaxial stress state.
  • the object of the invention is to create a chisel holder of the type mentioned at the outset, with which the machining forces can be transferred to a base part in a stress-optimized manner during the machining operation.
  • the plug-in attachment has two convex contact surfaces which are arranged at a distance from one another.
  • the use of two convex contact surfaces creates two contact areas that ensure reliable support.
  • the two contact surfaces enable the implementation of a statically determined clamping system.
  • the contact surfaces are arranged at a distance from one another by means of a recess in the plug-in attachment.
  • This recess can be produced in a simple manner in terms of production technology, so that the chisel holder can be produced with little effort.
  • the contact surfaces preferably have the same radius of curvature or the same geometry of curvature, so that a simple geometry of the counter surfaces of the base part into which the plug-in attachment is inserted becomes possible.
  • the two contact surfaces are particularly preferably arranged symmetrically to the central longitudinal axis of the plug-in attachment, so that a symmetrical force dissipation is possible.
  • the contact surfaces are particularly preferably located on the same pitch circle. Furthermore, it can be provided that the contact surfaces have the same center of curvature, so that production is further simplified. For example the contact surfaces can be turned over in one setting or processed in some other way.
  • the radius of curvature of the contact surfaces should be in the range between 16 mm and 32 mm. In the case of smaller curvature radii, excessive surface wear is to be feared in the case of high loads. If the radius of curvature is too large, reliable tensioning of the plug-in attachment on the pressure surface can be problematic. In particular, it is advantageous if the radius is a constant radius over the length of the contact surfaces, so that a partially cylindrical geometry of the contact surfaces is established. This measure enables a simple design of the plug-in receptacle of a base part into which the plug-in attachment is inserted.
  • the extension of the contact surfaces in the direction of the plug-in attachment should be in the range between 20 mm and 50 mm. Then the clamping forces are transferred from the chisel holder to the base part with optimized surface pressure. The extension of the contact surfaces in the circumferential direction should then be in the range between 30 ° and 80 °.
  • a chisel holder according to the invention can be designed in such a way that the contact surfaces merge via a convex transition region into the recess, which is concave in at least some regions. This creates a stress-optimized plug attachment cross-section.
  • a chisel holder according to the invention can be characterized in that the contact surfaces are arranged at least in some areas in the area of the front of the plug-in attachment facing the tool advance direction and the pressure surface in the area of the rear of the plug-in attachment.
  • the contact surfaces are arranged symmetrically to the central transverse plane of the plug-in extension running in the direction of the central longitudinal axis of the plug-in attachment, and / or that the pressure surface is arranged symmetrically to this central transverse plane.
  • the pressure surface is at least 20 mm (distance A) from the connection area of the plug-in attachment to the support body. It is also conceivable for this purpose that the contact surfaces are arranged at least 15 mm (distance dimension B) from the connection area of the plug-in attachment to the support body.
  • the center of gravity of at least one of the contact surfaces in the direction of the central longitudinal axis of the plug-in attachment is not more than 20 mm (distance C) from the center of gravity of the pressure surface. Sufficiently high clamping forces can then be generated. This also creates a balance of forces which enables clean "sliding" between the plug-in attachment and the base part, with the radial components of the clamping force also being absorbed via the contact surfaces.
  • the contact surfaces are formed by support sections which are raised compared to the actual plug-in attachment, then on the one hand a defined contact geometry is created in the transition area to the base part. On the other hand, the contact surfaces can work on the support sections, but the defined system geometry is retained. In addition, this also simplifies production.
  • the invention provides that the normal on the pressure surface is at an angle between 30 ° and 70 ° to the central longitudinal axis of the plug-in attachment.
  • Figure 1 shows a tool combination consisting of a base part 10 and a chisel holder 20.
  • the chisel holder 20 is interchangeably connected to the base part 10.
  • the base part 10 has a solid base body 13 which has a lower connection side 11.
  • This connection side 11 has a concave curvature, the curvature being selected in accordance with the outer diameter of a milling drum tube.
  • the base part 10 can thus be placed with its connection side 11 on the outside of the milling drum tube and welded to it.
  • the base body 13 has a projection on the front side which is delimited on the side by inclined surfaces 14 and on the front side by inclined surfaces 15.
  • the inclined surfaces 15 are set at an angle to one another and the inclined surfaces 14 adjoin the inclined surfaces 15 at an angle. This results in an arrow-shaped geometry of the base part 10 at the front, which leads to a better clearing effect of the base part 10.
  • a chisel holder receptacle 16 with a plug-in receptacle 16.7 is incorporated into the base part 10.
  • the plug-in receptacle 16.7 penetrates the base body 13 completely and thus opens into the connection side 11
  • a threaded receptacle 18 is incorporated, which opens into the plug-in receptacle 16.7 (see Figure 12 ).
  • the chisel holder receptacle 16 has first support surfaces 16.1 and second support surfaces 16.2.
  • the first support surfaces 16.1 form a first support surface pair and the second support surfaces 16.2 form a second support surface pair.
  • the supporting surfaces 16.1, 16.2 are each arranged at an angle to one another in each supporting surface pair.
  • the support surfaces 16.1 are each set at an angle to the support surfaces 16.2, so that an obtuse-angled chisel holder receptacle 16 results.
  • additional spaces 16.3, 16.4, 16.5 are provided in the form of recesses.
  • a recess 16.6 is also provided, which creates a transition from the bit holder receptacle 16 to the thread receptacle 18.
  • a surface 17 is formed around the entry into the threaded receptacle 18, which is laterally bounded by inclined surfaces, the inclined surfaces opening in a divergent manner towards the rear of the base part 10. In this way, the surface 17 and thus a tool holder 43 of a pressure screw 40 can be easily cleaned.
  • the pressure screw 40 has a threaded section 41 with which it can be screwed into the threaded receptacle 18. Furthermore, the pressure screw 40 is designed with a pressure shoulder 42 in the form of a truncated conical pin which is integrally formed on the threaded section 41.
  • the chisel holder 20 can be connected to the base part 10.
  • the chisel holder 20 has a support body 21 which is equipped with an apron 22 on the front.
  • the apron 22 carries a web 22.1, formed in one piece, which rises upwards from the apron 22.
  • a projection 23 is also coupled in one piece to the support body 21 and terminates in a cylindrical section 24.
  • the cylindrical section 24 is provided with wear marks, which in the present case are designed as circumferential grooves 26.
  • the cylindrical portion 24 terminates with a support surface 25 which concentrically the bore entry of a Chisel holder 27 revolves.
  • the chisel receptacle 27 merges into the support surface 25 via a bevel-shaped insertion section 27.1.
  • the chisel receptacle 27 is designed as a through hole.
  • the support body 21 is provided with a rear recess which serves as a flushing channel 28.
  • the flushing channel 28 consequently opens the chisel receptacle 27 radially outward in the region of its bore exit.
  • debris particles that have entered the chisel receptacle 27 during the use of the tool can be conveyed out radially through the flushing channel 28.
  • Figure 3 shows that the support body 21 has first removal surfaces 29.1 in the area of the skirt 22. These removal surfaces 29.1 are at an obtuse angle ⁇ 1 to one another (see Figure 13 ) and are connected to one another via a transition section 29.2. The angle ⁇ 1 between the first removal surfaces 29.1 corresponds to the angle between the first support surfaces 16.1 of the base part 10.
  • Figure 4 shows that the back of the support body 21 has downwardly facing second removal surfaces 29.4.
  • the second removal surfaces 29.4 are at an angle ⁇ 2 to one another (see Figure 14 ), the angle ⁇ 2 between the second removal surfaces 29.4 here also corresponding to the angle between the second support surfaces 16.2 of the base part 10. While the first removal surfaces 29.1 merge into one another by means of the transition section 29.2, a transition area is formed between the second removal surfaces 29.4 by the flushing channel 28 and a transition section 29.5.
  • the removal surfaces 29.1 and 29.4 each form pairs of removal surfaces in the form of a prism.
  • These prisms have a central longitudinal axis MLL, which is formed in the bisector plane between the two first removal surfaces 29.1 and the second removal surfaces 29.4.
  • these bisector planes are marked with WE.
  • the central longitudinal axis is indicated there with MLL, whereby the central longitudinal axis MLL can in principle be at any position within the bisector plane.
  • the Figures 3 and 4 show in conjunction with the Figures 13 and 14 that the first removal surfaces 29.1 and also the second removal surfaces 29.4 diverge starting from the plug-in attachment side towards the processing side.
  • the surface normals correspondingly converge on the removal surfaces 29.1, 29.4 from the plug-in attachment side to the processing side. The surface normals therefore converge in the area of the tool engagement point in which the machining forces are introduced into the tool system.
  • the use of two pairs of removal surfaces, each with the first and second removal surfaces 29.1 and 29.4, takes optimal account of the variance of the machining forces during tool engagement.
  • a comma span is created while the tool is being used.
  • the machining force acts in such a way that it is more likely to be diverted via the pair of removal surfaces formed by the first removal surfaces 29.1.
  • the direction of the machining force rotates and is then increasingly diverted via the pair of removal surfaces formed by the second removal surfaces 29.4.
  • the angle y ' (see Figure 5 ) be designed between the pairs of removal surfaces so that the variance of the machining force is taken into account, and this machining force always acts on the prisms formed by the pairs of removal surfaces.
  • the central transverse plane MQ of the bit holder 20 is marked.
  • the chisel holder is mirror-symmetrical to this central transverse plane MQ so that it can be installed on a milling drum as a right or left part
  • the feed direction is marked with the usual arrows.
  • the bit holder sides are arranged transversely to the feed direction.
  • the processing force does not only act in the direction of the image plane Figure 5 , but also in the transverse direction. These transverse force components are then ideally absorbed by the angular inclination ( ⁇ 1 , ⁇ 2 ) of the removal surfaces 29.1, 29.4. Since the machining forces scatter less in the transverse direction at the beginning of the tool engagement, the angle ⁇ 1 can also be selected to be smaller than ⁇ 2 .
  • Figure 5 further shows that a plug-in projection 30 is formed in one piece on the support body 21 and merges into the first removal surfaces 29.1 and the second removal surfaces 29.4 via a rounded transition 29.3.
  • the plug attachment 30 is arranged in such a way that it essentially, in the present case around 90%, adjoins the support body 21 in the area of the first removal surfaces 29.1.
  • the plug-in attachment 30 carries two contact surfaces 31.1 on the front. These are how Figure 3 can be seen, formed as convex cylinder surfaces.
  • the contact surfaces 31.1 extend longitudinally and parallel to the central longitudinal axis M (see FIG. Figure 5 ) of the plug-in attachment 30.
  • the contact surfaces 31.1 are therefore also parallel to one another.
  • the contact surfaces 31.1 are arranged at a distance from one another in the circumferential direction of the plug-in attachment 30. They have the same radius of curvature and are arranged on a common pitch circle. The radius of curvature corresponds to half the pitch circle diameter.
  • a recess 31.2 is provided in the area between the contact surfaces 31.1, the contact surfaces 31.1 running parallel to the recess 31.2.
  • the recess can have a wide variety of shapes, for example a simple surface.
  • the recess 31.2 forms a depression which is concave between the contact surfaces 31.1.
  • the concavity is designed so that a partially cylindrical geometry results.
  • the recess 31.2 does not extend over the entire length of the plug-in attachment 30, but only over a partial area, like this Fig. 13 detect leaves.
  • the recess 31.2 is open to the free end of the plug attachment 30, that is, in the plugging direction.
  • the recess 31.2 also opens radially outwards without undercuts.
  • the plug-in projection 30 has a pressure screw receptacle 32 on the rear side, which is equipped with a pressure surface 32.1.
  • Figures 6 and 9 illustrate that the recess 31.2 between the two contact surfaces 31.1 has a concavely curved geometry, and in particular can form a partially cylindrical cross section.
  • FIG. 9 clearly shows the concave bulge of the recess 31.2, which adjoins the convex contact surfaces 31.1.
  • FIG. 10 it becomes clear that the plug-in attachment 30 has a substantially circular or oval cross-sectional configuration in its area adjoining the contact surfaces 31.1.
  • Figure 8 illustrates the area of the pressure screw receptacle 32, the pressure surface 32.1 being set at an angle ⁇ to the central longitudinal axis M of the plug-in attachment 30. This setting angle ⁇ is preferably in the range between 20 ° and 60 ° in order to achieve an optimal pull-in effect of the chisel holder 20.
  • Figure 7 further shows that the pressure surface 32.1 is arranged at a distance A from the connection area of the plug-in attachment 30 to the support body 21.
  • the contact surfaces 31.1 are spaced apart by the distance B from the connection area of the plug-in attachment 30 to the support body 21.
  • the centroid of the contact surfaces 31.1 is arranged at a distance C from the centroid of the pressure surface 32.1.
  • the plug-in attachment 30 is inserted into the plug-in receptacle 16.7.
  • the insertion movement is carried out with the first and limited second removal surfaces 29.1, 29.4 which strike the first and second support surfaces 16.1, 16.2.
  • the assignment is made in such a way that the transition section 29.2 is above the supplementary space 16.4, the supplementary space 16.5 is bridged by the transition section 29.5 and the lateral supplementary spaces 16.3 are bridged by the angular area between the first and second removal surfaces 29.1, 29.4 is formed.
  • the spacing of the chisel holder 20 in the area of these readjusting spaces 16.3, 16.4, 16.5 ensures that the chisel holder 20 can move into the readjusting spaces 16.3, 16.4, 16.5 during the machining operation when the removal surfaces 29.1, 29.4 and / or the support surfaces 16.1 , 16.2 process. This applies in particular when worn chisel holders 20 are exchanged for new ones with an existing base part 10.
  • the pressure screw 40 is screwed into the threaded receptacle 18.
  • the pressure shoulder 42 presses itself with its flat end surface onto the pressure surface 32.1 and thus creates a pull-in force which acts in the direction of the central longitudinal axis M of the plug-in attachment 30.
  • the pressure screw 40 is also positioned at an angle to the central longitudinal axis M of the plug-in attachment 30 that a clamping force acting in the direction towards the front is also introduced into the plug-in attachment 30. This clamping force is transmitted via the contact surfaces 31.1 into the corresponding concave counter surface of the cylindrical section of the plug-in receptacle 16.7.
  • the spacing of the contact surfaces 31.1 via the recess 31.2 guarantees that the plug-in attachment 30 is reliably fixed via the two support areas formed laterally by the contact surfaces 31.1. In this way, the surface pressures that occur are kept low, in particular over the two contact surfaces 31.1, which leads to a reliable fixation of the plug-in attachment 30.
  • the chisel holder 20 can be readjusted into the readjustment spaces 16.3, 16.4, 16.5 in the event of wear, effective wear compensation can be made, with the removal surfaces 29.1, 29.4 supporting surfaces 16.1, 16.2 at every point so that in the event of wear and tear, the support surfaces 16.1, 16.2 are worn evenly without a so-called beard or burr arising.
  • This configuration is particularly advantageous when the base part 10, as is usually required, has a service life that lasts several life cycles of the bit holders 20. Unworn chisel holders 20 can then always be securely clamped and held on a partially worn base part 10. The repair of a machine in which the tool system formed from the base part 10 and chisel holder 20 is used is thus also simple.
  • a large number of tool systems are usually mounted on such a machine, for example a road milling machine or a surface miner.
  • the base part is usually welded onto the surface of a milled roller tube. If all or some of the chisel holders 20 are now worn, they can simply be exchanged for new unworn or partially worn chisel holders 20 (which can be used, for example, for rough removal work).
  • the pressure screw 40 When replacing, the pressure screw 40 is first loosened. The worn chisel holder 20 with its plug-in attachment 30 can then be pulled out of the plug-in receptacle 16.7 of the base part 10 and removed. Then the new (or partially worn) chisel holder 20 is inserted with its plug-in attachment 30 into the plug-in receptacle 16.7 of the base part 10. The pressure screw 40 can now be replaced with a new one if necessary. It is then screwed into the base part 10 and braced with the chisel holder 20 in the manner described above.
  • Figure 12 shows that the base part 10 carries a projection 50 which protrudes into the plug-in receptacle 16.7.
  • this projection 50 is formed by a cylinder pin which is driven into a partially cylindrical recess 19 from the connection side 11.
  • the partially cylindrical recess 19 surrounds the cylinder pin by more than 180 ° of its circumference, so that it is held captive.
  • the area of the cylindrical pin protruding into the chisel receptacle 27 engages in the recess 31.2 between the contact surfaces 31.1.
  • Figure 5 shows that the central longitudinal axis 24.1 of the chisel holder 27 is at an angle ⁇ or ⁇ to the longitudinal alignment of the transition section 29.2 or 29.5 and thus also to the central longitudinal axis MLL of the prism formed by the first removal surfaces 29.1 and the second removal surfaces 29.4.
  • the angle ⁇ can be between 40 ° and 60 ° or ⁇ in the range between 70 ° and 90 °.
  • Figure 5 also shows that when the removal surfaces 29.1 and 29.4 are projected into a plane transverse to the feed direction (projection corresponding to Figure 5 ) the removal surfaces 29.1 and 29.4 are angled to one another at an angle ⁇ in the range between 40 ° and 60 °, or that the opening angle between the transition sections 29.2 and 29.5 in the longitudinal direction according to Figure 5 is between 120 ° and 140 °.
  • the angle ⁇ 'between the central longitudinal axes MLL of the two prisms formed by the removal surfaces 29.1 and 29.4 (removal surface pairs) is in the range between 120 ° and 140 °.
  • the first removal surfaces 29.1 are at an angle ⁇ and the second removal surfaces 29.4 at an angle ⁇ to the central longitudinal axis M of the plug-in attachment 30.
  • the angles ⁇ and ⁇ can be in the range between 100 ° and 130 °, preferably in the range between 110 ° and 120 °.
  • Figure 13 shows that the first removal surfaces 29.1 enclose an angle ⁇ 1 .
  • This angle ⁇ 1 should preferably be in the range between 100 ° and 120 °.
  • the bisector of this angle ⁇ 1 lies in a plane and Figure 13 shows that the plug attachment 30 is arranged symmetrically to this plane.
  • the rear, second removal surfaces 29.4 are also made at an angle ⁇ 2 corresponding to one another, like this Figure 14 shows.
  • the angle ⁇ 2 can deviate from the angle ⁇ 1 and in the present exemplary embodiment can be between 120 ° and 140 ° and the plug-in attachment 30 is also arranged and equipped symmetrically to the bisector plane of this angle ⁇ 2 .
  • Figure 15 shows that a first removal surface 29.1 of the first removal surface pair and a second removal surface 29.4 of the second removal surface pair are positioned at an angle ⁇ to one another and form a support area.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Road Repair (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Jigs For Machine Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Knives (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Description

Die Erfindung betrifft einen Meißelhalter für eine Bodenbearbeitungsmaschine, insbesondere eine Straßenfräsmaschine mit einem Stützkörper, an den mittelbar oder unmittelbar ein Steckansatz an einer Steckansatzseite angeschlossen ist, wobei der Steckansatz wenigstens eine konvexe Anlagefläche und eine Druckfläche aufweist.The invention relates to a chisel holder for a soil cultivation machine, in particular a road milling machine with a support body to which a plug-in attachment is connected directly or indirectly to one plug-in attachment side, the plug-in attachment having at least one convex contact surface and a pressure surface.

Ein solcher Meißelhalter ist aus der EP 0 771 911 A1 bekannt. Dabei weist der Meißelhalter einen Steckansatz mit einer stumpfkegelförmigen Außengeometrie auf. Der Meißelhalter kann mit dem Steckansatz in ein Basisteil eingesetzt werden, das auf der Oberfläche eines Fräswalzenrohres befestigt ist. Zur Fixierung des Meißelhalters wird eine Druckschraube verwendet, die auf den Steckansatz einwirkt. Mit der Druckschraube wird der Steckansatz in einer Aufnahmebohrung eines Meißelhalters verspannt. Während des Betriebseinsatzes werden hohe Bearbeitungskräfte über den Meißelhalter in das Basisteil abgeleitet. Der runde Schaftquerschnitt des Steckansatzes verhindert dabei, dass Kräfte in Umfangsrichtung des Steckansatzes übertragen werden.Such a chisel holder is from EP 0 771 911 A1 known. The chisel holder has a plug-in attachment with a frusto-conical outer geometry. The chisel holder can be inserted with the plug-in attachment in a base part that is attached to the surface of a milling drum tube. To fix the chisel holder, a pressure screw is used that acts on the plug-in attachment. The plug-in attachment is clamped in a receiving bore of a chisel holder with the pressure screw. During operation, high machining forces are diverted into the base part via the chisel holder. The round shaft cross-section of the plug-in attachment prevents forces from being transmitted in the circumferential direction of the plug-in attachment.

Es werden allerdings in ein in dem Meißelhalter gehaltenen Bearbeitungswerkzeug starke Wechselbelastungen eingeleitet und in das Basisteil übertragen. Diese Wechselbeanspruchungen lasten auf den Passflächen zwischen Meißelhalter und Basisteil. Insbesondere beim Fräsen sehr harter Bodenbeläge, wie beispielsweise Betonflächen, kann es vorkommen, dass die Sitzflächen zwischen Meißelhalter und Basisteil sich aufweiten bzw. ausschlagen. Dann ist der sichere Halt des Meißelhalters im Basisteil nicht mehr garantiert. Insbesondere muss dann weiterhin das Basisteil ausgetauscht werden, was mit einem hohen Teile- und Montageaufwand einhergeht.However, strong alternating loads are introduced into a machining tool held in the chisel holder and transferred to the base part. These alternating stresses load the mating surfaces between the chisel holder and the base part. In particular when milling very hard floor coverings, such as concrete surfaces, it can happen that the seating surfaces between the chisel holder and the base part expand or knock out. Then the secure hold of the chisel holder in the base part is no longer guaranteed. In particular, the base part then still has to be replaced, which is associated with a high expenditure on parts and assembly.

Es werden daher Meißelhalter eingesetzt, die auch im Falle eines Verschleißes eine gewisse Nachsetzung des Meißelhalters in dem Basisteil ermöglichen, um so zu hohen Standzeiten zu gelangen.Chisel holders are therefore used which allow a certain readjustment of the chisel holder in the base part even in the event of wear, in order to achieve a long service life.

Ein derartiger Meißelhalter ist in der DE 43 22 401 A1 gezeigt. Dabei wird ein fünfkantiger Steckansatz in eine entsprechend ausgestaltete Steckaufnahme eines Basisteils eingesetzt.Such a chisel holder is in the DE 43 22 401 A1 shown. A pentagonal plug-in attachment is inserted into a correspondingly configured plug-in receptacle of a base part.

Es stützt sich der Meißelhalter mit einer Stützfläche seines Stützkörpers an einer Gegenfläche des Basisteils ab, um dabei einen Großteil der Beanspruchungen ableiten zu können. Mit dem fünfkantigen Querschnitt des Steckansatzes werden während des Bearbeitungsprozesses auftretende Querkräfte über den Steckansatz in das Basisteil eingeleitet. Damit entstehen aber außer den gewünschten Zugspannungen und den unvermeidlichen Biegespannungen auch noch Torsionsspannungen in dem Steckansatz. Mithin stellt sich dadurch ein mehrachsiger Spannungszustand ein.The chisel holder is supported with a support surface of its support body on a counter surface of the base part in order to be able to dissipate a large part of the stresses. With the pentagonal cross-section of the plug-in attachment, transverse forces occurring during the machining process are introduced into the base part via the plug-in attachment. In addition to the desired tensile stresses and the unavoidable bending stresses, this also creates torsional stresses in the plug-in attachment. This results in a multiaxial stress state.

DE 10 2004 057 302 A1 zeigt einen weiteren Meißelhalter. DE 10 2004 057 302 A1 shows another chisel holder.

Es ist Aufgabe der Erfindung, einen Meißelhalter der eingangs erwähnten Art zu schaffen, mit dem sich die Bearbeitungskräfte während des Bearbeitungseinsatzes beanspruchungsoptimiert in ein Basisteil ableiten lassen.The object of the invention is to create a chisel holder of the type mentioned at the outset, with which the machining forces can be transferred to a base part in a stress-optimized manner during the machining operation.

Diese Aufgabe wird dadurch gelöst, dass der Steckansatz zwei konvexe Anlageflächen aufweist, die zueinander beabstandet angeordnet sind. Die Verwendung zweier konvexer Anlageflächen schafft zwei Anlagebereiche die für eine zuverlässige Abstützung sorgen. Darüber hinaus ermöglichen die beiden Anlageflächen die Verwirklichung eines statisch bestimmten Spannsystems.This object is achieved in that the plug-in attachment has two convex contact surfaces which are arranged at a distance from one another. The use of two convex contact surfaces creates two contact areas that ensure reliable support. In addition, the two contact surfaces enable the implementation of a statically determined clamping system.

Selbst, wenn ein Flächenverschleiß stattfindet, können sich die beiden Anlageflächen an den entsprechenden Gegenflächen des Basisteils nachsetzen, sodass der Meißelhalter nachgespannt werden kann. Weiterhin ist dann auch ein Austausch eines verschlissenen Meißelhalters in einem bestehenden Basisteil möglich.Even if there is surface wear, the two contact surfaces can readjust themselves on the corresponding mating surfaces of the base part, so that the chisel holder can be retightened. Furthermore, it is then also possible to replace a worn bit holder in an existing base part.

Gemäß einer bevorzugten Erfindungsausgestaltung kann es vorgesehen sein, dass die Anlageflächen mittels einer Ausnehmung des Steckansatzes zueinander beabstandet angeordnet sind. Diese Ausnehmung lässt sich fertigungstechnisch einfach herstellen, sodass der Meißelhalter mit geringem Aufwand gefertigt werden kann.According to a preferred embodiment of the invention, it can be provided that the contact surfaces are arranged at a distance from one another by means of a recess in the plug-in attachment. This recess can be produced in a simple manner in terms of production technology, so that the chisel holder can be produced with little effort.

Bevorzugterweise weisen die Anlageflächen den gleichen Wölbungsradius oder die gleiche Wölbungsgeometrie auf, damit wird eine einfache Geometrie der Gegenflächen des Basisteils, in das der Steckansatz eingesetzt wird möglich.The contact surfaces preferably have the same radius of curvature or the same geometry of curvature, so that a simple geometry of the counter surfaces of the base part into which the plug-in attachment is inserted becomes possible.

Besonders bevorzugt sind die beiden Anlageflächen symmetrisch zur Mittellängsachse des Steckansatzes angeordnet, sodass eine symmetrische Kraftableitung möglich wird.The two contact surfaces are particularly preferably arranged symmetrically to the central longitudinal axis of the plug-in attachment, so that a symmetrical force dissipation is possible.

Besonders bevorzugt liegen dabei die Anlageflächen auf einem gleichen Teilkreis. Weiterhin kann es vorgesehen sein, dass die Anlageflächen denselben Wölbungsmittelpunkt aufweisen, sodass die Fertigung weiter vereinfacht wird. Beispielsweise können die Anlageflächen in einer Aufspannung überdreht oder auf sonstige Weise bearbeitet werden.The contact surfaces are particularly preferably located on the same pitch circle. Furthermore, it can be provided that the contact surfaces have the same center of curvature, so that production is further simplified. For example the contact surfaces can be turned over in one setting or processed in some other way.

Es hat sich gezeigt, dass der Wölbungsradius der Anlageflächen im Bereich zwischen 16 mm und 32 mm liegen sollte. Bei kleineren Wölbungsradien ist ein zu hoher Flächenverschleiß bei großen Beanspruchungen zu befürchten. Wenn der Wölbungsradius zu groß gewählt wird, dann kann eine zuverlässige Verspannung des Steckansatzes an der Druckfläche problematisch werden. Insbesondere ist es vorteilhaft, wenn der Radius ein konstanter Radius über die Länge der Anlageflächen ist, sodass sich eine teilzylindrische Geometrie der Anlageflächen einstellt. Diese Maßnahme ermöglicht eine einfache Gestalt der Steckaufnahme eines Basisteils in die der Steckansatz eingesetzt ist.It has been shown that the radius of curvature of the contact surfaces should be in the range between 16 mm and 32 mm. In the case of smaller curvature radii, excessive surface wear is to be feared in the case of high loads. If the radius of curvature is too large, reliable tensioning of the plug-in attachment on the pressure surface can be problematic. In particular, it is advantageous if the radius is a constant radius over the length of the contact surfaces, so that a partially cylindrical geometry of the contact surfaces is established. This measure enables a simple design of the plug-in receptacle of a base part into which the plug-in attachment is inserted.

Es hat sich gezeigt, dass für die geforderten Anwendungsfälle bei Bodenbearbeitungsmaschinen die Erstreckung der Anlageflächen in Richtung des Steckansatzes im Bereich zwischen 20 mm und 50 mm liegen sollte. Dann werden die Spannkräfte flächenpressungsoptimiert vom Meißelhalter auf das Basisteil übertragen. Die Erstreckung der Anlageflächen in Umfangsrichtung sollte dann jeweils im Bereich zwischen 30° und 80° liegen.It has been shown that for the required applications in soil cultivation machines, the extension of the contact surfaces in the direction of the plug-in attachment should be in the range between 20 mm and 50 mm. Then the clamping forces are transferred from the chisel holder to the base part with optimized surface pressure. The extension of the contact surfaces in the circumferential direction should then be in the range between 30 ° and 80 °.

Ein erfindungsgemäßer Meißelhalter kann dergestalt sein, dass die Anlageflächen über einen konvexen Übergangsbereich in die zumindest bereichsweise konkav ausgebildete Ausnehmung übergehen. Hierdurch wird ein spannungsoptimierter Steckansatzquerschnitt gestaltet.A chisel holder according to the invention can be designed in such a way that the contact surfaces merge via a convex transition region into the recess, which is concave in at least some regions. This creates a stress-optimized plug attachment cross-section.

Ein Meißelhalter nach der Erfindung kann dadurch gekennzeichnet sein, dass die Anlageflächen zumindest bereichsweise im Bereich der der Werkzeugvorschubrichtung zugewandten Steckansatz-Vorderseite und die Druckfläche im Bereich der Steckansatz-Rückseite angeordnet ist.A chisel holder according to the invention can be characterized in that the contact surfaces are arranged at least in some areas in the area of the front of the plug-in attachment facing the tool advance direction and the pressure surface in the area of the rear of the plug-in attachment.

Um eine symmetrische Kraftverteilung zu erhalten, kann es vorgesehen sein, dass die Anlageflächen symmetrisch zu der in Richtung der Mittellängsachse des Steckansatzes verlaufenden Mittelquerebene des Steckansatzes angeordnet sind, und/oder dass die Druckfläche symmetrisch zu dieser Mittelquerebene angeordnet ist. Mit der symmetrischen Anordnung der Anlageflächen und der Druckfläche sowie der Aufteilung der Anlagefläche in ein Paar beabstandeter Teilflächen wird die Reaktionskraft auf die Andrückkraft, die über die Druckfläche eingeleitet wird, in ein Kräftepaar aufgeteilt, wobei die Vektoren des Reaktionskräftepaars mit dem Vektor der Andrückkraft ein System bilden, bei dem die Vektoren sternförmig aufeinander zu laufen und den Steckansatz in die Mitte nehmen.In order to obtain a symmetrical force distribution, it can be provided that the contact surfaces are arranged symmetrically to the central transverse plane of the plug-in extension running in the direction of the central longitudinal axis of the plug-in attachment, and / or that the pressure surface is arranged symmetrically to this central transverse plane. With the symmetrical arrangement of the contact surfaces and the pressure surface as well as the division of the contact surface into a pair of spaced-apart partial surfaces, the reaction force to the pressing force, which is introduced via the pressure surface, is divided into a force pair, with the vectors of the reaction force pair and the vector of the pressing force forming a system form, in which the vectors run towards each other in a star shape and take the plug-in attachment in the middle.

Um eine ausreichende Einzugkraft über die Druckfläche auf den Steckansatz ausüben zu können, kann es vorgesehen sein, dass die Druckfläche zumindest 20 mm (Abstandsmaß A) von dem Anschlussbereich des Steckansatzes an den Stützkörper beabstandet angeordnet ist. Denkbar ist es hierzu auch, dass die Anlageflächen zumindest 15 mm (Abstandsmaß B) von dem Anschlussbereich des Steckansatzes an den Stützkörper beabstandet angeordnet sind.In order to be able to exert a sufficient pull-in force on the plug-in attachment via the pressure surface, it can be provided that the pressure surface is at least 20 mm (distance A) from the connection area of the plug-in attachment to the support body. It is also conceivable for this purpose that the contact surfaces are arranged at least 15 mm (distance dimension B) from the connection area of the plug-in attachment to the support body.

Im Rahmen der Erfindung kann es auch vorgesehen sein, dass der Flächenschwerpunkt zumindest einer der Anlageflächen in Richtung der Mittellängsachse des Steckansatzes nicht mehr als 20 mm (Abstandsmaß C) von dem Flächenschwerpunkt der Druckfläche beabstandet ist. Dann können ausreichend hohe Spannkräfte erzeugt werden. Damit wird auch ein Kräfteverhältnis geschaffen, das ein sauberes "Gleiten" zwischen Steckansatz und Basisteil ermöglicht, wobei auch die radialen Anteile der Spannkraft über die Anlageflächen aufgenommen werden.Within the scope of the invention it can also be provided that the center of gravity of at least one of the contact surfaces in the direction of the central longitudinal axis of the plug-in attachment is not more than 20 mm (distance C) from the center of gravity of the pressure surface. Sufficiently high clamping forces can then be generated. This also creates a balance of forces which enables clean "sliding" between the plug-in attachment and the base part, with the radial components of the clamping force also being absorbed via the contact surfaces.

Wenn es vorgesehen ist, dass die Anlageflächen von Tragabschnitten gebildet werden, die im Vergleich zum eigentlichen Steckansatz erhaben sind, dann wird zum einen eine definierte Anlagegeometrie im Übergangsbereich zum Basisteil geschaffen. Zum anderen können sich die Anlageflächen auf den Tragabschnitten abarbeiten, wobei aber die definierte Anlagegeometrie erhalten bleibt. Darüber hinaus wird dadurch auch die Fertigung vereinfacht.If it is provided that the contact surfaces are formed by support sections which are raised compared to the actual plug-in attachment, then on the one hand a defined contact geometry is created in the transition area to the base part. On the other hand, the contact surfaces can work on the support sections, but the defined system geometry is retained. In addition, this also simplifies production.

Zur Erzeugung einer ausreichend hohen Einzugkraft in Richtung der Mittellängsachse des Steckansatzes und gleichzeitig einer senkrecht zur Mittellängsachse wirkenden Spannkraft ist es erfindungsgemäß vorgesehen, dass die Normale auf die Druckfläche im Winkel zwischen 30° und 70° zu der Mittellängsachse des Steckansatzes steht.To generate a sufficiently high pull-in force in the direction of the central longitudinal axis of the plug-in attachment and at the same time a clamping force acting perpendicular to the central longitudinal axis, the invention provides that the normal on the pressure surface is at an angle between 30 ° and 70 ° to the central longitudinal axis of the plug-in attachment.

Die Erfindung wird im Folgenden anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

Figur 1
eine Kombination eines Basisteils und eines Meißelhalters in perspektivischer Seitenansicht;
Figur 2
die Darstellung gemäß Figur 1 in Explosionsansicht;
Figur 3
den Meißelhalter gemäß den Figuren 1 und 2 in Frontansicht;
Figur 4
den Meißelhalter gemäß den Figuren 1 bis 3 in Rückansicht;
Figur 5
den Meißelhalter gemäß den Figuren 1 bis 4 in Seitenansicht von links;
Figur 6
die Darstellung gemäß Figur 5 im Vertikalschnitt durch die Mittelquerebene des Meißelhalters;
Figur 7
den Meißelhalter gemäß den Figuren 1 bis 6 in Seitenansicht von rechts und teilweise im Schnitt;
Figur 8
einen in Figur 5 mit VIII-VIII markierten Schnittverlauf;
Figur 9
einen in Figur 7 mit IX-IX markierten Schnittverlauf;
Figur 10
einen in Figur 7 mit X-X markierten Schnittverlauf;
Figur 11
die Werkzeugkombination gemäß Figur 1 in Draufsicht;
Figur 12
einen in Figur 11 mit XII-XII markierten Schnittverlauf;
Figur 13
den Meißelhalter gemäß Figur 5 in Ansicht von vorne;
Figur 14
den Meißelhalter in Ansicht von hinten; und
Figur 15
den Meißelhalter in einer gedrehten Seitenansicht.
The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawings. Show it:
Figure 1
a combination of a base part and a chisel holder in a perspective side view;
Figure 2
the representation according to Figure 1 in exploded view;
Figure 3
the chisel holder according to the Figures 1 and 2 in front view;
Figure 4
the chisel holder according to the Figures 1 to 3 in rear view;
Figure 5
the chisel holder according to the Figures 1 to 4 in side view from the left;
Figure 6
the representation according to Figure 5 in vertical section through the central transverse plane of the chisel holder;
Figure 7
the chisel holder according to the Figures 1 to 6 in side view from the right and partially in section;
Figure 8
one in Figure 5 section line marked VIII-VIII;
Figure 9
one in Figure 7 cutting line marked with IX-IX;
Figure 10
one in Figure 7 cutting line marked with XX;
Figure 11
the tool combination according to Figure 1 in plan view;
Figure 12
one in Figure 11 with XII-XII marked cutting course;
Figure 13
the chisel holder according to Figure 5 in front view;
Figure 14
the chisel holder in a view from behind; and
Figure 15
the chisel holder in a rotated side view.

Figur 1 zeigt eine Werkzeugkombination bestehend aus einem Basisteil 10 und einem Meißelhalter 20. Dabei ist der Meißelhalter 20 auswechselbar mit dem Basisteil 10 verbunden. Das Basisteil 10 weist einen massiven Grundkörper 13 auf, der eine untere Anschlussseite 11 aufweist. Diese Anschlussseite 11 ist konkav gewölbt, wobei die Wölbung entsprechend des Außendurchmessers eines Fräswalzenrohres gewählt ist. Damit kann das Basisteil 10 mit seiner Anschlussseite 11 auf die Außenseite des Fräswalzenrohres aufgesetzt und an diesem festgeschweißt werden. Der Grundkörper 13 weist frontseitig einen Vorsprung auf, der seitlich von Schrägflächen 14 und frontseitig von Neigungsflächen 15 begrenzt ist. Die Neigungsflächen 15 sind zueinander im Winkel angestellt und die Schrägflächen 14 schließen winklig an die Neigungsflächen 15 an. Damit ergibt sich frontseitig eine pfeilförmige Geometrie des Basisteils 10, die zu einer besseren Räumwirkung des Basisteils 10 führt. Figure 1 shows a tool combination consisting of a base part 10 and a chisel holder 20. The chisel holder 20 is interchangeably connected to the base part 10. The base part 10 has a solid base body 13 which has a lower connection side 11. This connection side 11 has a concave curvature, the curvature being selected in accordance with the outer diameter of a milling drum tube. The base part 10 can thus be placed with its connection side 11 on the outside of the milling drum tube and welded to it. The base body 13 has a projection on the front side which is delimited on the side by inclined surfaces 14 and on the front side by inclined surfaces 15. The inclined surfaces 15 are set at an angle to one another and the inclined surfaces 14 adjoin the inclined surfaces 15 at an angle. This results in an arrow-shaped geometry of the base part 10 at the front, which leads to a better clearing effect of the base part 10.

Wie die Figur 2 verdeutlicht, ist in das Basisteil 10 eine Meißelhalteraufnahme 16 mit einer Steckaufnahme 16.7 eingearbeitet. Dabei durchdringt die Steckaufnahme 16.7 den Grundkörper 13 vollständig und mündet somit in der Anschlussseite 11. In das Basisteil 10 ist eine Gewindeaufnahme 18 eingearbeitet, die in der Steckaufnahme 16.7 mündet (siehe Figur 12). Die Meißelhalteraufnahme 16 weist erste Stützflächen 16.1 und zweite Stützflächen 16.2 auf. Die ersten Stützflächen 16.1 bilden ein erstes Stützflächenpaar und die zweiten Stützflächen 16.2 bilden ein zweites Stützflächenpaar. Dabei sind in jedem Stützflächenpaar die Stützflächen 16.1, 16.2 jeweils winklig zueinander angeordnet. Weiterhin sind auch die Stützflächen 16.1 jeweils zu den Stützflächen 16.2 im Winkel angestellt, sodass sich eine stumpfwinklige Meißelhalteraufnahme 16 ergibt. Im Übergangsbereich zwischen den einzelnen Stützflächen 16.1 und 16.2 sind jeweils Nachsetzräume 16.3, 16.4, 16.5 in Form von Ausnehmungen vorgesehen. Im Bereich des Nachsetzraumes 16.5 ist weiterhin eine Aussparung 16.6 vorgesehen, die einen Übergang von der Meißelhalteraufnahme 16 zu der Gewindeaufnahme 18 schafft.As the Figure 2 illustrates, a chisel holder receptacle 16 with a plug-in receptacle 16.7 is incorporated into the base part 10. The plug-in receptacle 16.7 penetrates the base body 13 completely and thus opens into the connection side 11 In the base part 10, a threaded receptacle 18 is incorporated, which opens into the plug-in receptacle 16.7 (see Figure 12 ). The chisel holder receptacle 16 has first support surfaces 16.1 and second support surfaces 16.2. The first support surfaces 16.1 form a first support surface pair and the second support surfaces 16.2 form a second support surface pair. The supporting surfaces 16.1, 16.2 are each arranged at an angle to one another in each supporting surface pair. Furthermore, the support surfaces 16.1 are each set at an angle to the support surfaces 16.2, so that an obtuse-angled chisel holder receptacle 16 results. In the transition area between the individual support surfaces 16.1 and 16.2, additional spaces 16.3, 16.4, 16.5 are provided in the form of recesses. In the area of the readjustment space 16.5, a recess 16.6 is also provided, which creates a transition from the bit holder receptacle 16 to the thread receptacle 18.

Wie Figur 2 weiter erkennen lässt, ist um den Eintritt in die Gewindeaufnahme 18 eine Fläche 17 gebildet, die seitlich von Schrägflächen begrenzt wird, wobei die Schrägflächen sich divergierend zur Rückseite des Basisteils 10 hin öffnen. Auf diese Weise wird eine leichte Reinigbarkeit der Fläche 17 und damit einer Werkzeugaufnahme 43 einer Druckschraube 40 geschaffen. Die Druckschraube 40 weist einen Gewindeabschnitt 41 auf, mit dem sie in die Gewindeaufnahme 18 eingeschraubt werden kann. Weiterhin ist die Druckschraube 40 mit einem Druckansatz 42 in Form eines stumpfkegelförmigen Zapfens ausgebildet, der einteilig an den Gewindeabschnitt 41 angeformt ist.How Figure 2 can further be seen, a surface 17 is formed around the entry into the threaded receptacle 18, which is laterally bounded by inclined surfaces, the inclined surfaces opening in a divergent manner towards the rear of the base part 10. In this way, the surface 17 and thus a tool holder 43 of a pressure screw 40 can be easily cleaned. The pressure screw 40 has a threaded section 41 with which it can be screwed into the threaded receptacle 18. Furthermore, the pressure screw 40 is designed with a pressure shoulder 42 in the form of a truncated conical pin which is integrally formed on the threaded section 41.

Wie Figur 2 weiter zeigt, kann mit dem Basisteil 10 der Meißelhalter 20 verbunden werden. Der Meißelhalter 20 besitzt einen Stützkörper 21, der frontseitig mit einer Schürze 22 ausgestattet ist. Die Schürze 22 trägt einteilig angeformt einen Steg 22.1, der von der Schürze 22 ausgehend nach oben aufsteigt. An den Stützkörper 21 ist auch ein Ansatz 23 einteilig angekoppelt, der in einem zylindrischen Abschnitt 24 abschließt. Der zylindrische Abschnitt 24 ist mit Verschleißmarkierungen versehen, die vorliegend als umlaufende Nuten 26 ausgebildet sind. Der zylindrische Abschnitt 24 schließt mit einer Stützfläche 25 ab, die konzentrisch den Bohrungseintritt einer Meißelaufnahme 27 umläuft. Die Meißelaufnahme 27 geht über einen fasenförmigen Einführabschnitt 27.1 in die Stützfläche 25 über.How Figure 2 further shows, the chisel holder 20 can be connected to the base part 10. The chisel holder 20 has a support body 21 which is equipped with an apron 22 on the front. The apron 22 carries a web 22.1, formed in one piece, which rises upwards from the apron 22. A projection 23 is also coupled in one piece to the support body 21 and terminates in a cylindrical section 24. The cylindrical section 24 is provided with wear marks, which in the present case are designed as circumferential grooves 26. The cylindrical portion 24 terminates with a support surface 25 which concentrically the bore entry of a Chisel holder 27 revolves. The chisel receptacle 27 merges into the support surface 25 via a bevel-shaped insertion section 27.1.

Wie Figur 4 zeigt, ist die Meißelaufnahme 27 als Durchgangsbohrung ausgebildet. Der Stützkörper 21 ist mit einer rückseitigen Aussparung versehen, die als Spülkanal 28 dient. Der Spülkanal 28 öffnet mithin die Meißelaufnahme 27 im Bereich ihres Bohrungsaustrittes radial nach außen. Somit können während des Werkzeugeinsatzes in die Meißelaufnahme 27 eingetretene Abraumpartikel durch den Spülkanal 28 radial nach außen ausgefördert werden.How Figure 4 shows, the chisel receptacle 27 is designed as a through hole. The support body 21 is provided with a rear recess which serves as a flushing channel 28. The flushing channel 28 consequently opens the chisel receptacle 27 radially outward in the region of its bore exit. Thus, debris particles that have entered the chisel receptacle 27 during the use of the tool can be conveyed out radially through the flushing channel 28.

Figur 3 lässt erkennen, dass der Stützkörper 21 im Bereich der Schürze 22 erste Abtragflächen 29.1 aufweist. Diese Abtragflächen 29.1 stehen zueinander im stumpfen Winkel ε1 (siehe Figur 13) und sind über einen Übergangsabschnitt 29.2 miteinander verbunden. Dabei entspricht der Winkel ε1 zwischen den ersten Abtragflächen 29.1 dem Winkel zwischen den ersten Stützflächen 16.1 des Basisteils 10. Figure 3 shows that the support body 21 has first removal surfaces 29.1 in the area of the skirt 22. These removal surfaces 29.1 are at an obtuse angle ε 1 to one another (see Figure 13 ) and are connected to one another via a transition section 29.2. The angle ε 1 between the first removal surfaces 29.1 corresponds to the angle between the first support surfaces 16.1 of the base part 10.

Figur 4 lässt erkennen, dass der Stützkörper 21 rückseitig nach unten weisende zweite Abtragflächen 29.4 besitzt. Die zweiten Abtragflächen 29.4 stehen zueinander im Winkel ε2 (siehe Figur 14), wobei auch hier der Winkel ε2 zwischen den zweiten Abtragflächen 29.4 dem Winkel zwischen den zweiten Stützflächen 16.2 des Basisteils 10 entspricht. Während die ersten Abtragflächen 29.1 mittels des Übergangsabschnittes 29.2 ineinander übergehen, ist zwischen den zweiten Abtragflächen 29.4 ein Übergangsbereich durch den Spülkanal 28 und einem Übergangsabschnitt 29.5 gebildet. Figure 4 shows that the back of the support body 21 has downwardly facing second removal surfaces 29.4. The second removal surfaces 29.4 are at an angle ε 2 to one another (see Figure 14 ), the angle ε 2 between the second removal surfaces 29.4 here also corresponding to the angle between the second support surfaces 16.2 of the base part 10. While the first removal surfaces 29.1 merge into one another by means of the transition section 29.2, a transition area is formed between the second removal surfaces 29.4 by the flushing channel 28 and a transition section 29.5.

Die Abtragflächen 29.1 und 29.4 bilden jeweils Abtragflächenpaare in Form eines Prismas. Dabei weisen diese Prismen eine Mittellängsachse MLL auf, die in der Winkelhalbierenden- Ebene zwischen den beiden ersten Abtragflächen 29.1 beziehungsweise den zweiten Abtragflächen 29.4 gebildet ist. In den Figuren 13 und 14 sind diese Winkelhalbierenden-Ebenen mit WE markiert. Die Mittellängsachse ist dort mit MLL angegeben, wobei die Mittellängsachse MLL prinzipiell an einer beliebigen Positionierung innerhalb der Winkelhalbierenden-Ebene liegen kann.The removal surfaces 29.1 and 29.4 each form pairs of removal surfaces in the form of a prism. These prisms have a central longitudinal axis MLL, which is formed in the bisector plane between the two first removal surfaces 29.1 and the second removal surfaces 29.4. In the Figures 13 and 14 these bisector planes are marked with WE. The central longitudinal axis is indicated there with MLL, whereby the central longitudinal axis MLL can in principle be at any position within the bisector plane.

Die Figuren 3 und 4 zeigen in Verbindung mit den Figuren 13 und 14, dass die ersten Abtragflächen 29.1 und auch die zweiten Abtragflächen 29.4 ausgehend von der Steckansatzseite hin zur Bearbeitungsseite divergieren. Im vorliegenden Beispiel konvergieren dabei entsprechend die Flächennormalen auf die Abtragflächen 29.1, 29.4 von der Steckansatzseite hin zur Bearbeitungsseite. Die Flächennormalen konvergieren mithin im Bereich des Werkzeugeingriffspunktes, in dem die Bearbeitungskräfte in das Werkzeugsystem eingeleitet werden.The Figures 3 and 4 show in conjunction with the Figures 13 and 14 that the first removal surfaces 29.1 and also the second removal surfaces 29.4 diverge starting from the plug-in attachment side towards the processing side. In the present example, the surface normals correspondingly converge on the removal surfaces 29.1, 29.4 from the plug-in attachment side to the processing side. The surface normals therefore converge in the area of the tool engagement point in which the machining forces are introduced into the tool system.

Die Verwendung zweier Abtragflächenpaare mit den jeweils ersten und zweiten Abtragflächen 29.1 beziehungsweise 29.4 trägt der Varianz der Bearbeitungskräfte während des Werkzeugeingriffes optimal Rechnung. Während des Werkzeugeingriffes entsteht ein Kommaspan. Bei dieser Spanbildung ändert sich nicht nur der Kraftbetrag, sondern auch die Kraftrichtung. Dementsprechend wirkt zu Beginn des Werkzeugeingriffes die Bearbeitungskraft derart, dass sie eher über das von den ersten Abtragflächen 29.1 gebildete Abtragflächenpaar abgeleitet wird. Bei fortschreitendem Werkzeugeingriff dreht die Richtung der Bearbeitungskraft und wird dann zunehmend über das von den zweiten Abtragflächen 29.4 gebildete Abtragflächenpaar abgeleitet. Demnach muss der Winkel y' (siehe Figur 5) zwischen den Abtragflächenpaaren so ausgebildet sein, dass der Varianz der Bearbeitungskraft Rechnung getragen ist, und diese Bearbeitungskraft stets in die von den Abtragflächenpaaren gebildeten Prismen hineinwirkt.The use of two pairs of removal surfaces, each with the first and second removal surfaces 29.1 and 29.4, takes optimal account of the variance of the machining forces during tool engagement. A comma span is created while the tool is being used. With this chip formation, not only the amount of force changes, but also the direction of force. Accordingly, at the beginning of the tool engagement, the machining force acts in such a way that it is more likely to be diverted via the pair of removal surfaces formed by the first removal surfaces 29.1. As the tool engagement progresses, the direction of the machining force rotates and is then increasingly diverted via the pair of removal surfaces formed by the second removal surfaces 29.4. Accordingly, the angle y '(see Figure 5 ) be designed between the pairs of removal surfaces so that the variance of the machining force is taken into account, and this machining force always acts on the prisms formed by the pairs of removal surfaces.

In den Figuren 3 und 9 ist die Mittelquerebene MQ des Meißelhalters 20 markiert. Der Meißelhalter ist spiegelsymmetrisch zu dieser Mittelquerebene MQ aufgebaut, sodass er auf einer Fräswalze als rechtes oder linkes Teil verbaut werden kannIn the Figures 3 and 9 the central transverse plane MQ of the bit holder 20 is marked. The chisel holder is mirror-symmetrical to this central transverse plane MQ so that it can be installed on a milling drum as a right or left part

In den Figuren 3 und 4 ist mit üblichen Pfeildarstellungen die Vorschubrichtung gekennzeichnet. Quer zu der Vorschubrichtung sind die Meißelhalterseiten angeordnet.In the Figures 3 and 4 the feed direction is marked with the usual arrows. The bit holder sides are arranged transversely to the feed direction.

Die Flächennormalen der Abtragflächen 29.1 und 29.4 weisen somit jeweils zu ihrer in Werkzeugvorschubrichtung gesehenen Seite des Meißelhalters und nach unten, wie dies aus den Figuren 3 und 4 deutlich wird. In Figur 5 ist dieser Sachverhalt nochmals in Seitendarstellung gezeigt.The surface normals of the removal surfaces 29.1 and 29.4 thus each point to their side of the chisel holder viewed in the tool advance direction and downwards, as can be seen from FIGS Figures 3 and 4 becomes clear. In Figure 5 this fact is shown again in a side view.

Die Bearbeitungskraft wirkt aber nicht nur in der Richtung der Bildebene gemäß Figur 5, sondern vielmehr auch in Querrichtung. Diese Querkraftkomponenten werden dann über die winklige Anstellung (ε1, ε2) der Abtragflächen 29.1, 29.4 ideal abgefangen. Da zu Beginn des Werkzeugeingriffes die Bearbeitungskräfte weniger in Querrichtung streuen, kann der Winkel ε1 auch kleiner als ε2 gewählt werden.However, the processing force does not only act in the direction of the image plane Figure 5 , but also in the transverse direction. These transverse force components are then ideally absorbed by the angular inclination (ε 1 , ε 2 ) of the removal surfaces 29.1, 29.4. Since the machining forces scatter less in the transverse direction at the beginning of the tool engagement, the angle ε 1 can also be selected to be smaller than ε 2 .

Figur 5 zeigt weiter, dass an den Stützkörper 21 ein Steckansatz 30 einteilig angeformt ist und über einen Rundungsübergang 29.3 in die ersten Abtragflächen 29.1 und die zweiten Abtragflächen 29.4 übergeht. Dabei ist der Steckansatz 30 so angeordnet, dass er im Wesentlichen, vorliegend zu rund 90 %, im Bereich der ersten Abtragflächen 29.1 an den Stützkörper 21 anschließt. Der Steckansatz 30 trägt frontseitig zwei Anlageflächen 31.1. Diese sind, wie Figur 3 erkennen lässt, als konvex gewölbte Zylinderflächen ausgebildet. Die Anlageflächen 31.1 erstrecken sich längs und parallel zu der Mittellängsachse M (s. Figur 5) des Steckansatzes 30. Die Anlageflächen 31.1 sind mithin auch zueinander parallel. Die Anlageflächen 31.1 sind in Umfangsrichtung des Steckansatzes 30 zueinander beabstandet angeordnet. Sie weisen den gleichen Wölbungsradius auf und sind auf einem gemeinsamen Teilkreis angeordnet. Der Wölbungsradius entspricht dem halben Teilkreisdurchmesser. Im Bereich zwischen den Anlageflächen 31.1 ist eine Ausnehmung 31.2 vorgesehen, wobei die Anlageflächen 31.1 parallel zu der Ausnehmung 31.2 verlaufen. Die Ausnehmung kann verschiedenste Formen aufweisen, beispielsweise eine einfache Anspiegelung sein. Im vorliegenden Ausführungsbeispiel bildet die Ausnehmung 31.2 eine Einmuldung, die konkav zwischen den Anlageflächen 31.1 eingemuldet ist. Die Konkavität ist dabei so ausgelegt, dass sich eine teil-zylinderförmige Geometrie ergibt. Die Ausnehmung 31.2 erstreckt sich nicht über die gesamte Länge des Steckansatzes 30, sondern nur über einen Teilbereich, wie dies Fig. 13 erkennen lässt. Die Ausnehmung 31.2 ist zum freien Ende des Steckansatzes 30, also in Steckrichtung, offen. Die Ausnehmung 31.2 öffnet sich auch hinterschnittfrei radial nach außen. Den Anlageflächen 31.1 gegenüberliegend weist der Steckansatz 30 rückseitig eine Druckschraubenaufnahme 32 auf, die mit einer Druckfläche 32.1 ausgerüstet ist. Figure 5 further shows that a plug-in projection 30 is formed in one piece on the support body 21 and merges into the first removal surfaces 29.1 and the second removal surfaces 29.4 via a rounded transition 29.3. The plug attachment 30 is arranged in such a way that it essentially, in the present case around 90%, adjoins the support body 21 in the area of the first removal surfaces 29.1. The plug-in attachment 30 carries two contact surfaces 31.1 on the front. These are how Figure 3 can be seen, formed as convex cylinder surfaces. The contact surfaces 31.1 extend longitudinally and parallel to the central longitudinal axis M (see FIG. Figure 5 ) of the plug-in attachment 30. The contact surfaces 31.1 are therefore also parallel to one another. The contact surfaces 31.1 are arranged at a distance from one another in the circumferential direction of the plug-in attachment 30. They have the same radius of curvature and are arranged on a common pitch circle. The radius of curvature corresponds to half the pitch circle diameter. A recess 31.2 is provided in the area between the contact surfaces 31.1, the contact surfaces 31.1 running parallel to the recess 31.2. The recess can have a wide variety of shapes, for example a simple surface. In the present exemplary embodiment, the recess 31.2 forms a depression which is concave between the contact surfaces 31.1. The concavity is designed so that a partially cylindrical geometry results. The recess 31.2 does not extend over the entire length of the plug-in attachment 30, but only over a partial area, like this Fig. 13 detect leaves. The recess 31.2 is open to the free end of the plug attachment 30, that is, in the plugging direction. The recess 31.2 also opens radially outwards without undercuts. Opposite the contact surfaces 31.1, the plug-in projection 30 has a pressure screw receptacle 32 on the rear side, which is equipped with a pressure surface 32.1.

Figuren 6 und 9 veranschaulichen, dass die Ausnehmung 31.2 zwischen den beiden Anlageflächen 31.1 eine konkav eingewölbte Geometrie aufweist, und insbesondere einen teilzylinderförmigen Querschnitt bilden kann. Figures 6 and 9 illustrate that the recess 31.2 between the two contact surfaces 31.1 has a concavely curved geometry, and in particular can form a partially cylindrical cross section.

In den Figuren 7 bis 10 ist die Gestaltung des Steckansatzes 30 näher detailliert. Figur 9 zeigt deutlich die konkave Einwölbung der Ausnehmung 31.2, die an die konvexen Anlageflächen 31.1 anschließt. Aus Figur 10 wird deutlich, dass der Steckansatz 30 in seinem an die Anlageflächen 31.1 anschließenden Bereich im Wesentlichen eine kreisförmige beziehungsweise ovale Querschnittsgestaltung hat. Figur 8 veranschaulicht den Bereich der Druckschraubenaufnahme 32, wobei die Druckfläche 32.1 im Winkel δ zur Mittellängsachse M des Steckansatzes 30 angestellt ist. Dabei liegt dieser Anstellwinkel δ vorzugsweise im Bereich zwischen 20° und 60°, um eine optimale Einzugwirkung des Meißelhalters 20 zu erreichen.In the Figures 7 to 10 the design of the plug-in attachment 30 is detailed. FIG. 9 clearly shows the concave bulge of the recess 31.2, which adjoins the convex contact surfaces 31.1. Out Figure 10 it becomes clear that the plug-in attachment 30 has a substantially circular or oval cross-sectional configuration in its area adjoining the contact surfaces 31.1. Figure 8 illustrates the area of the pressure screw receptacle 32, the pressure surface 32.1 being set at an angle δ to the central longitudinal axis M of the plug-in attachment 30. This setting angle δ is preferably in the range between 20 ° and 60 ° in order to achieve an optimal pull-in effect of the chisel holder 20.

Figur 7 zeigt weiterhin, dass die Druckfläche 32.1 von dem Anschlussbereich des Steckansatzes 30 an den Stützkörper 21 um das Abstandsmaß A beabstandet angeordnet ist. Figure 7 further shows that the pressure surface 32.1 is arranged at a distance A from the connection area of the plug-in attachment 30 to the support body 21.

Die Anlageflächen 31.1 sind um das Abstandsmaß B von dem Anschlussbereich des Steckansatzes 30 an den Stützkörper 21 beabstandet angeordnet. Der Flächenschwerpunkt der Anlageflächen 31.1 ist um das Abstandsmaß C von dem Flächenschwerpunkt der Druckfläche 32.1 beabstandet angeordnet.The contact surfaces 31.1 are spaced apart by the distance B from the connection area of the plug-in attachment 30 to the support body 21. The centroid of the contact surfaces 31.1 is arranged at a distance C from the centroid of the pressure surface 32.1.

Zur Montage des Meißelhalters 20 in das Basisteil 10 wird der Steckansatz 30 in die Steckaufnahme 16.7 eingesteckt. Die Einsetzbewegung wird mit den ersten und zweiten Abtragflächen 29.1, 29.4 begrenzt, die an den ersten und zweiten Stützflächen 16.1, 16.2 anschlagen.To mount the chisel holder 20 in the base part 10, the plug-in attachment 30 is inserted into the plug-in receptacle 16.7. The insertion movement is carried out with the first and limited second removal surfaces 29.1, 29.4 which strike the first and second support surfaces 16.1, 16.2.

Wie die Figuren 1 und 12 erkennen lassen, ist dabei die Zuordnung so getroffen, dass der Übergangsabschnitt 29.2 über dem Nachsetzraum 16.4 steht, der Nachsetzraum 16.5 von dem Übergangsabschnitt 29.5 überbrückt wird und die seitlichen Nachsetzräume 16.3 von dem Winkelbereich überbrückt sind, der zwischen den ersten und zweiten Abtragflächen 29.1, 29.4 gebildet ist. Über die Beabstandung des Meißelhalters 20 im Bereich dieser Nachsetzräume 16.3, 16.4, 16.5 wird erreicht, dass sich während des Bearbeitungseinsatzes der Meißelhalter 20 in die Nachsetzräume 16.3, 16.4, 16.5 nachsetzen kann, wenn sich die Abtragflächen 29.1, 29.4 und/oder die Stützflächen 16.1, 16.2 abarbeiten. Dies gilt insbesondere dann, wenn verschlissene Meißelhalter 20 bei bestehendem Basisteil 10 gegen neue ausgetauscht werden. Zur Fixierung des vorgeschriebenen Einbauzustandes wird die Druckschraube 40 in die Gewindeaufnahme 18 eingeschraubt. Dabei presst sich der Druckabsatz 42 mit seiner ebenen Endfläche auf die Druckfläche 32.1 auf und bewirkt so eine Einzugkraft, die in Richtung der Mittellängsachse M des Steckansatzes 30 wirkt. Gleichzeitig ist aber auch die Druckschraube 40 winklig so zur Mittellängsachse M des Steckansatzes 30 angestellt, dass auch eine in Richtung zur Vorderseite wirkende Spannkraft in den Steckansatz 30 eingebracht wird. Diese Spannkraft wird über die Anlageflächen 31.1 in die korrespondierende konkave Gegenfläche des zylindrischen Abschnittes der Steckaufnahme 16.7 übertragen. Die Beabstandung der Anlageflächen 31.1 über die Ausnehmung 31.2 garantiert, dass der Steckansatz 30 über die beiden seitlich durch die Anlageflächen 31.1 gebildeten Abstützbereiche zuverlässig fixiert ist. Damit werden insbesondere auch über die beiden Anlageflächen 31.1 die auftretenden Flächenpressungen gering gehalten, was zu einer zuverlässigen Fixierung des Steckansatzes 30 führt.As the Figures 1 and 12 can be seen, the assignment is made in such a way that the transition section 29.2 is above the supplementary space 16.4, the supplementary space 16.5 is bridged by the transition section 29.5 and the lateral supplementary spaces 16.3 are bridged by the angular area between the first and second removal surfaces 29.1, 29.4 is formed. The spacing of the chisel holder 20 in the area of these readjusting spaces 16.3, 16.4, 16.5 ensures that the chisel holder 20 can move into the readjusting spaces 16.3, 16.4, 16.5 during the machining operation when the removal surfaces 29.1, 29.4 and / or the support surfaces 16.1 , 16.2 process. This applies in particular when worn chisel holders 20 are exchanged for new ones with an existing base part 10. To fix the prescribed installation state, the pressure screw 40 is screwed into the threaded receptacle 18. The pressure shoulder 42 presses itself with its flat end surface onto the pressure surface 32.1 and thus creates a pull-in force which acts in the direction of the central longitudinal axis M of the plug-in attachment 30. At the same time, however, the pressure screw 40 is also positioned at an angle to the central longitudinal axis M of the plug-in attachment 30 that a clamping force acting in the direction towards the front is also introduced into the plug-in attachment 30. This clamping force is transmitted via the contact surfaces 31.1 into the corresponding concave counter surface of the cylindrical section of the plug-in receptacle 16.7. The spacing of the contact surfaces 31.1 via the recess 31.2 guarantees that the plug-in attachment 30 is reliably fixed via the two support areas formed laterally by the contact surfaces 31.1. In this way, the surface pressures that occur are kept low, in particular over the two contact surfaces 31.1, which leads to a reliable fixation of the plug-in attachment 30.

Dadurch, dass der Meißelhalter 20 sich im Verschleißfall in die Nachsetzräume 16.3, 16.4, 16.5 nachsetzen lässt, kann ein effektiver Verschleißausgleich vorgenommen werden, wobei die Abtragflächen 29.1, 29.4 die Stützflächen 16.1, 16.2 an jeder Stelle überragen, sodass im Falle der Abnutzung jedenfalls die Stützflächen 16.1, 16.2 gleichmäßig abgenützt werden, ohne dass ein so genannter Bart oder Grat entsteht. Diese Ausgestaltung ist insbesondere dann von Vorteil, wenn das Basisteil 10, wie dies üblicherweise gefordert wird, eine Standzeit aufweist, die mehrere Lebenszyklen von Meißelhaltern 20 andauert. Unverschlissene Meißelhalter 20 können dann stets auch noch an einem teilverschlissenen Basisteil 10 sicher verspannt und gehalten werden. Somit gestaltet sich auch die Reparatur einer Maschine, bei der das aus Basisteil 10 und Meißelhalter 20 gebildete Werkzeugsystem eingesetzt ist, einfach. Üblicherweise sind auf einer solchen Maschine, beispielsweise Straßenfräsmaschine oder einem Surface Miner, eine Vielzahl von Werkzeugsystemen montiert. Dabei ist das Basisteil meist auf der Oberfläche eines Fräswalzrohrs aufgeschweißt. Wenn nun alle oder einige der Meißelhalter 20 verschlissen sind, können sie einfach gegen neue unverschlissene oder teilverschlissene Meißelhalter 20 (die beispielsweise für grobe Ausbauarbeiten genutzt werden können) ausgetauscht werden.Because the chisel holder 20 can be readjusted into the readjustment spaces 16.3, 16.4, 16.5 in the event of wear, effective wear compensation can be made, with the removal surfaces 29.1, 29.4 supporting surfaces 16.1, 16.2 at every point so that in the event of wear and tear, the support surfaces 16.1, 16.2 are worn evenly without a so-called beard or burr arising. This configuration is particularly advantageous when the base part 10, as is usually required, has a service life that lasts several life cycles of the bit holders 20. Unworn chisel holders 20 can then always be securely clamped and held on a partially worn base part 10. The repair of a machine in which the tool system formed from the base part 10 and chisel holder 20 is used is thus also simple. A large number of tool systems are usually mounted on such a machine, for example a road milling machine or a surface miner. The base part is usually welded onto the surface of a milled roller tube. If all or some of the chisel holders 20 are now worn, they can simply be exchanged for new unworn or partially worn chisel holders 20 (which can be used, for example, for rough removal work).

Beim Austausch wird zunächst die Druckschraube 40 gelöst. Dann kann der verschlissene Meißelhalter 20 mit seinem Steckansatz 30 aus der Steckaufnahme 16.7 des Basisteils 10 herausgezogen und entfernt werden. Anschließend wird der neue (oder teilverschlissene) Meißelhalter 20 mit seinem Steckansatz 30 in die Steckaufnahme 16.7 des Basisteils 10 eingesetzt. Nun kann die Druckschraube 40 bedarfsweise gegen eine neue ersetzt werden. Sie wird dann in das Basisteil 10 eingeschraubt und in der oben beschriebenen Weise mit dem Meißelhalter 20 verspannt.When replacing, the pressure screw 40 is first loosened. The worn chisel holder 20 with its plug-in attachment 30 can then be pulled out of the plug-in receptacle 16.7 of the base part 10 and removed. Then the new (or partially worn) chisel holder 20 is inserted with its plug-in attachment 30 into the plug-in receptacle 16.7 of the base part 10. The pressure screw 40 can now be replaced with a new one if necessary. It is then screwed into the base part 10 and braced with the chisel holder 20 in the manner described above.

Figur 12 lässt erkennen, dass das Basisteil 10 einen Vorsprung 50 trägt, der in die Steckaufnahme 16.7 ragt. Dieser Vorsprung 50 wird vorliegend von einem Zylinderstift gebildet, der von der Anschlussseite 11 her in eine teilzylindrische Ausnehmung 19 eingetrieben ist. Die teilzylindrische Ausnehmung 19 umgibt dabei den Zylinderstift, um mehr als 180° seines Umfanges, sodass er unverlierbar gehalten ist. Der in die Meißelaufnahme 27 vorstehende Bereich des Zylinderstiftes greift in die Ausnehmung 31.2 zwischen den Anlageflächen 31.1 ein. Beim Einsetzen des Steckansatzes 30 in die Steckaufnahme 16.7 fädelt der Vorsprung 50 in die zum freien Ende des Steckansatzes 30 hin offene Ausnehmung 31.2 zuverlässig ein. Damit wird eine Ausrichtung des Meißelhalters 20 gegenüber dem Basisteil 10 erreicht. Diese Ausrichtung garantiert, dass nun die ersten und zweiten Abtragflächen 29.1, 29.4 passgenau zur Anlage an den Stützflächen 16.1, 16.2 kommen, sodass eine Fehlmontage ausgeschlossen ist. Weiterhin verhindert der Vorsprung 50 und die daran geometrisch angepasste Ausnehmung 31.2 in Form eines Schlüssel-Schloss-Prinzips, dass versehentlich ein falscher Meißelhalter 20 am Basisteil 10 verbaut wird. Figure 12 shows that the base part 10 carries a projection 50 which protrudes into the plug-in receptacle 16.7. In the present case, this projection 50 is formed by a cylinder pin which is driven into a partially cylindrical recess 19 from the connection side 11. The partially cylindrical recess 19 surrounds the cylinder pin by more than 180 ° of its circumference, so that it is held captive. The area of the cylindrical pin protruding into the chisel receptacle 27 engages in the recess 31.2 between the contact surfaces 31.1. When inserting the plug-in attachment 30 into the plug-in receptacle 16.7, the projection 50 threads into the free end of the plug-in extension 30 reliably a recess 31.2 open. An alignment of the chisel holder 20 with respect to the base part 10 is thus achieved. This alignment guarantees that the first and second removal surfaces 29.1, 29.4 now come to rest precisely on the support surfaces 16.1, 16.2, so that incorrect assembly is excluded. Furthermore, the projection 50 and the geometrically adapted recess 31.2 in the form of a key-lock principle prevent an incorrect chisel holder 20 from being accidentally installed on the base part 10.

Nachfolgend wird noch näher auf die Winkelzusammenhänge des erfindungsgemäßen Meißelhalters 20 eingegangen.The angular relationships of the bit holder 20 according to the invention will be discussed in greater detail below.

Figur 5 lässt erkennen, dass die Mittellängsachse 24.1 der Meißelaufnahme 27 im Winkel α beziehungsweise ϕ zu der Längsausrichtung des Übergangsabschnittes 29.2 beziehungsweise 29.5 und damit auch zur Mittellängsachse MLL des von den ersten Abtragflächen 29.1 beziehungsweise von den zweiten Abtragflächen 29.4 gebildeten Prismas steht. Dabei kann der Winkel α zwischen 40° und 60° betragen beziehungsweise ϕ im Bereich zwischen 70° und 90° betragen. Figure 5 shows that the central longitudinal axis 24.1 of the chisel holder 27 is at an angle α or ϕ to the longitudinal alignment of the transition section 29.2 or 29.5 and thus also to the central longitudinal axis MLL of the prism formed by the first removal surfaces 29.1 and the second removal surfaces 29.4. The angle α can be between 40 ° and 60 ° or ϕ in the range between 70 ° and 90 °.

Figur 5 zeigt weiterhin, dass bei einer Projektion der Abtragflächen 29.1 und 29.4 in eine Ebene quer zur Vorschubrichtung (Projektion entsprechend Figur 5) die Abtragflächen 29.1 und 29.4 in einem Winkel γ im Bereich zwischen 40° und 60° zueinander angewinkelt sind, beziehungsweise, dass der Öffnungswinkel zwischen den Übergangsabschnitten 29.2 und 29.5 in Längsausrichtung gemäß Figur 5 zwischen 120° und 140° beträgt. Dementsprechend liegt der Winkel γ' zwischen den Mittellängsachsen MLL der beiden von den Abtragflächen 29.1 und 29.4 gebildeten Prismen (Abtragflächenpaare) im Bereich zwischen 120° und 140°. Weiterhin stehen bei einer solchen Projektion der Abtragflächen 29.1, 29.4 die ersten Abtragflächen 29.1 im Winkel β und die zweiten Abtragflächen 29.4 im Winkel µ zu der Mittellängsachse M des Steckansatzes 30. Entsprechendes gilt auch hier für die Mittellängsachsen MLL der Prismen. Die Winkel β und µ können dabei im Bereich zwischen 100° und 130°, vorzugsweise im Bereich zwischen 110° und 120°, liegen. Figure 5 also shows that when the removal surfaces 29.1 and 29.4 are projected into a plane transverse to the feed direction (projection corresponding to Figure 5 ) the removal surfaces 29.1 and 29.4 are angled to one another at an angle γ in the range between 40 ° and 60 °, or that the opening angle between the transition sections 29.2 and 29.5 in the longitudinal direction according to Figure 5 is between 120 ° and 140 °. Correspondingly, the angle γ 'between the central longitudinal axes MLL of the two prisms formed by the removal surfaces 29.1 and 29.4 (removal surface pairs) is in the range between 120 ° and 140 °. Furthermore, with such a projection of the removal surfaces 29.1, 29.4, the first removal surfaces 29.1 are at an angle β and the second removal surfaces 29.4 at an angle µ to the central longitudinal axis M of the plug-in attachment 30. The same applies here to the central longitudinal axes MLL of the prisms. The angles β and μ can be in the range between 100 ° and 130 °, preferably in the range between 110 ° and 120 °.

Figur 13 zeigt, dass die ersten Abtragflächen 29.1 einen Winkel ε1 einschließen. Vorzugsweise sollte dieser Winkel ε1 im Bereich zwischen 100° und 120° liegen. Die Winkelhalbierende dieses Winkels ε1 liegt in einer Ebene und Figur 13 verdeutlicht, dass der Steckansatz 30 symmetrisch zu dieser Ebene angeordnet ist. Figure 13 shows that the first removal surfaces 29.1 enclose an angle ε 1 . This angle ε 1 should preferably be in the range between 100 ° and 120 °. The bisector of this angle ε 1 lies in a plane and Figure 13 shows that the plug attachment 30 is arranged symmetrically to this plane.

Auf gleiche Weise sind auch die hinteren zweiten Abtragflächen 29.4 entsprechend zueinander in einem Winkel ε2 angestellt, wie dies Figur 14 zeigt. Allerdings kann der Winkel ε2 von dem Winkel ε1 abweichen und in dem vorliegenden Ausführungsbeispiel zwischen 120° und 140° liegen und der Steckansatz 30 ist auch symmetrisch zu der Winkelhalbierenden-Ebene dieses Winkels ε2 angeordnet und ausgestattet.In the same way, the rear, second removal surfaces 29.4 are also made at an angle ε 2 corresponding to one another, like this Figure 14 shows. However, the angle ε 2 can deviate from the angle ε 1 and in the present exemplary embodiment can be between 120 ° and 140 ° and the plug-in attachment 30 is also arranged and equipped symmetrically to the bisector plane of this angle ε 2 .

Figur 15 zeigt, dass jeweils eine erste Abtragfläche 29.1 des ersten Abtragflächenpaars und eine zweite Abtragfläche 29.4 des zweiten Abtragflächenpaars zueinander im Winkel ω angestellt sind und einen Stützbereich bilden. Figure 15 shows that a first removal surface 29.1 of the first removal surface pair and a second removal surface 29.4 of the second removal surface pair are positioned at an angle ω to one another and form a support area.

Claims (16)

  1. A bit holder for a soil working machine, in particular a road milling machine, with a support body (21) to which a plug-in projection (30) is directly or indirectly connected on a plug-in-projection-side, wherein the plug-in projection (30) has two abutting surfaces (31.1) and a pressure surface (32.1),
    wherein the two abutting surfaces (31.1) are arranged spaced apart from one another,
    wherein the abutting surfaces (31.1) are arranged at least in regions in the region of the front side of the plug-in-projection-side facing the tool feed direction (v) and the pressure surface (32.1) is arranged in the region of the rear side of the plug-in projection,
    characterized in that
    the abutting surfaces (31.1) are convex.
  2. Bit holder according to claim 1,
    characterized in that
    the abutting surfaces (31.1) are arranged spaced apart by means of a recess (31.2) of the plug-in projection (30).
  3. Bit holder according to one of claims 1 or 2,
    characterized in that
    the abutting surfaces (31.1) have the same radius of curvature or the same curvature geometry.
  4. Bit holder according to claim 3,
    characterized in that
    the radius of curvature of the abutting surfaces (31.1) is in the range between 16 mm and 32 mm.
  5. Bit holder according to one of the claims 3 to 4,
    characterized in that
    the radius of curvature is a constant radius over the length of the abutting surfaces (31.1).
  6. Bit holder according to one of claims 1 to 5,
    characterized in that
    the abutting surfaces (31.1) are arranged on an identical pitch circle, and/or in that the abutting surfaces (31.1) have the same center of curvature.
  7. Bit holder according to one of claims 1 to 6,
    characterized in that
    the extension of the abutting surfaces (31.1) in the direction of the plug-in projection (30) is in the range between 20 mm and 50 mm.
  8. Bit holder according to one of the claims 1 to 7,
    characterized in that
    the extension of the abutting surfaces (31.1) in the circumferential direction is at least 30° to 80°.
  9. Bit holder according to one of claims 1 to 8,
    characterized in that
    the abutting surfaces (31.1) merge via a convex transition region into the recess (31.2), which is of concave design at least in a region.
  10. Bit holder according to one of claims 1 to 9,
    characterized in that
    the abutting surfaces (31.1) are arranged symmetrically to the central transverse plane (MQ) of the plug-in projection (30), which central transverse plane (MQ) extends in the direction of the central longitudinal axis of the plug-in projection (30), and/or in that the pressure surface (32.1) is arranged symmetrically to this central transverse plane (MQ).
  11. Bit holder according to one of claims 1 to 10,
    characterized in that
    the pressure surface (32.1) is arranged at a distance of at least 20 mm (distance A) from the connection region of the plug-in projection (30) to the support body (21).
  12. Bit holder according to one of claims 1 to 11,
    characterized in that
    the contact surfaces (31.1) are arranged at a distance of at least 15 mm (distance dimension B) from the connection region of the plug-in attachment (30) to the support body (21).
  13. Bit holder according to one of claims 1 to 12,
    characterized in that
    the center of gravity of at least one of the abutting surfaces (31.1) is not more than 20 mm (distance C) away from the center of gravity of the pressure surface (32.1) in the direction of the central longitudinal axis of the plug-in projection (30).
  14. Bit holder according to any of claims 1 to 13,
    characterized in that
    the normal line through the center of gravity of the pressure surface (32.1) penetrates the plug-in projection (30) between the abutting surfaces (31.1)
  15. Bit holder according to one of claims 1 to 14,
    characterized in that
    the abutting surfaces (31.1) are formed by supporting sections which are raised with respect to the plug-in projection (30).
  16. Bit holder according to one of claims 1 to 15,
    characterized in that
    the normal to the pressure surface (32.1) is at an angle of between 30° and 70° to the central longitudinal axis of the plug-in projection (30).
EP11788888.3A 2010-12-03 2011-12-02 Chisel holder Active EP2646652B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010061019A DE102010061019A1 (en) 2010-12-03 2010-12-03 Chisel holder and lower tool part for a chisel holder
DE201110051523 DE102011051523A1 (en) 2011-07-04 2011-07-04 Chisel holder for soil cultivation machine, particularly road milling machine, has supporting body to which plug-in attachment is indirectly or directly connected at plug-in attachment end
PCT/EP2011/071587 WO2012072785A2 (en) 2010-12-03 2011-12-02 Chisel holder

Publications (2)

Publication Number Publication Date
EP2646652A2 EP2646652A2 (en) 2013-10-09
EP2646652B1 true EP2646652B1 (en) 2020-10-14

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US (2) US9228434B2 (en)
EP (1) EP2646652B1 (en)
JP (1) JP5788016B2 (en)
KR (1) KR101609729B1 (en)
CN (3) CN202705874U (en)
AU (1) AU2011334838B2 (en)
BR (1) BR112013011893B1 (en)
RU (1) RU2571106C2 (en)
SG (1) SG190983A1 (en)
TW (1) TWI480447B (en)
WO (1) WO2012072785A2 (en)

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US9228434B2 (en) 2016-01-05
US20130270891A1 (en) 2013-10-17
CN106906729B (en) 2020-06-12
US9765620B2 (en) 2017-09-19
CN202705874U (en) 2013-01-30
KR101609729B1 (en) 2016-04-06
SG190983A1 (en) 2013-08-30
BR112013011893A2 (en) 2017-11-14
KR20130088190A (en) 2013-08-07
CN103089261B (en) 2016-11-09
CN103089261A (en) 2013-05-08
RU2013130245A (en) 2015-01-10
JP2014501860A (en) 2014-01-23
WO2012072785A3 (en) 2012-11-29
AU2011334838B2 (en) 2016-05-19
JP5788016B2 (en) 2015-09-30
US20160177717A1 (en) 2016-06-23
CN106906729A (en) 2017-06-30
TWI480447B (en) 2015-04-11
TW201224243A (en) 2012-06-16
RU2571106C2 (en) 2015-12-20
BR112013011893B1 (en) 2020-03-10
AU2011334838A1 (en) 2013-05-02
EP2646652A2 (en) 2013-10-09
WO2012072785A2 (en) 2012-06-07

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