EP2729666A2

EP2729666A2 - Chisel holder for a soil treatment machine

Info

Publication number: EP2729666A2
Application number: EP12733049.6A
Authority: EP
Inventors: Thomas Lehnert; Karsten Buhr; Cyrus Barimani; Günter HÄHN
Original assignee: Wirtgen GmbH
Current assignee: Wirtgen GmbH
Priority date: 2011-07-04
Filing date: 2012-06-28
Publication date: 2014-05-14
Anticipated expiration: 2032-06-28
Also published as: US20160208606A1; PL2729666T3; EP2729666B1; TWI561702B; TW201307636A; CN102864728B; JP6016812B2; RU2584429C2; WO2013004583A2; BR112013013170B1; JP2014507582A; BR112013013170A2; DE102011051525A1; US10208593B2; AU2012280450A1; US9739145B2; US20180016898A1; RU2013132701A; WO2013004583A3; US9260965B2

Abstract

The invention relates to a chisel holder for a soil treatment machine, especially a road miller, said chisel holder having a chisel seat in the region of a treatment side of a support base and carrying an add-on indirectly or directly on an add-on side of the support base, wherein the support base has two stripping surfaces [first and second stripping surfaces] forming a pair of stripping surfaces that are at angles relative to each other. In order to provide a chisel holder that has a stable and rigid design, the support base according to the invention comprises at least one additional stripping surface that is at an angle relative to the two stripping surfaces of the pair of stripping surfaces.

Description

Chisel holder for a soil tillage machine

The invention relates to a bit holder for a tillage machine, in particular a road milling machine having a chisel in the region of a processing side of a support body and directly or indirectly carries a plug-in neck on a plug-in approach side of the support body, wherein the support body has two Abtragflächenpaar forming Abtragflächen that each other in the Angle stand.

From US 3,992,061 a chisel hauler is known, which forms a support body with a one-piece molded plug neck. The support body is penetrated by a cylindrical bore formed as a chisel. In the chisel holder, a machining tool, in this case a round shank chisel, are used. The support body has two mutually angled Abtragflächen, which serve to support on corresponding support surfaces of a base part. The base part has a plug-in receptacle, in which the bit holder with his Plug-in replaceable can be used. In the assembled state, the Abtragf laugh the chisel holder to the support surfaces of the base part. In order to maintain a fixed surface allocation, a clamping screw is used, which jams the plug-in projection in the socket of the base part.

During machining operation, the machining tool engages in the substrate to be processed. In this case, high machining forces are transmitted and derived from the bit holder in the base part. The force direction and also the amount itself varies under otherwise identical conditions, solely due to the fact that the machining tool forms a chip (commaspan) thickening from the entry point to the exit point. In addition, the direction of force and the amount varies depending on various parameters, such as the milling depth, the feed, the material to be processed, etc.

The design of a chisel holder shown in US Pat. No. 3,992,061 can not dissipate the machining forces with sufficiently good service life, especially at high feed speeds. In particular, the wear surfaces strike fast. In addition, the plug-in approach is exposed to high bending stresses and there is a risk that after a component fatigue a plug neck break occurs.

From DE 34 11 602 A1 a further bit holder is known. This has a support body which is supported by projections on a base part. On the support body, a clamping part is formed, which can be connected via wedge joints with the base part.

Another Meißeihalter is known from US 4,828,327. The chisel holder is designed as a solid block, which is penetrated by a chisel holder. Furthermore, the bit holder on a threaded receptacle which is in alignment with a Screw holder of a base part is. Through the screw holder, a fastening screw can be guided through and screwed into the threaded receptacle of the chisel holder; When the fastening screw is tightened, the bit holder is drawn into an L-shaped recess in the base part and supported there on support surfaces. The bit holders are usually arranged in a projecting manner on the surface of a milling drum tube. During machining operation, lateral forces also occur which act transversely to the tool feed direction. These transverse forces acting in the direction of the central longitudinal axis of the milling drum tube can not always be received sufficiently stable with the tool holders described in US Pat. No. 4,828,327. In particular, these transverse forces are transferred into the fastening screw, which is then subjected to strong shear.

It is an object of the invention to provide a bit holder of the type mentioned, which is characterized by a high stability.

This object is achieved in that the support body has a further removal surface which is at an angle to the two removal surfaces of the Abtragflächenpaares.

According to the invention, three removal surfaces are provided on the bit holder, which are used for load transfer into the base part. The three ablation surfaces are at an angle to each other and thus, similar to a pyramid with a triangular base, a three-sided support. This support guarantees a tight fit of the chisel holder on the base part even with changing direction of the machining force. In addition, a relief of the plug-in projection is caused by the three wear surfaces. Within the scope of the invention, one or more additional removal surfaces can also be added to the three removal surfaces in order to attach the bit holder to adapt a specific work task. For example, it is also possible to use four support surfaces, which are all in mutual control of one another.

According to a preferred embodiment of the invention, it can be provided that the two removal surfaces of the Abtragflächenpaars are arranged at least partially in the feed direction of the chisel holder before the plug approach and another Abtragfiäche against the feed direction behind the plug approach. Alternatively, it can also be provided that the two removal surfaces of the Abtragflächenpaares opposite to the feed direction at least partially behind the plug approach and another Abtragfiäche in the feed direction is at least partially disposed in front of the insertion approach. The distribution of the removal surfaces and the further Abtragfiäche on the areas of the bit holder in front of the plug-in approach and behind the plug-in approach optimally takes into account the power conditions during machining intervention. As explained above, a chip thickening from the entry point to the exit point of the machining tool is formed. In this case, the processing forces at the beginning of the tool insert with respect to their direction rather such that a load of the chisel holder arises in front of the insertion approach. Subsequently, the direction of the processing force changes, so that increasingly the areas behind the plug-in approach are charged. The above-described arrangement of Abtragflächen optimally takes into account the resulting load conditions.

A load-optimized construction results from the fact that the two removal surfaces of the Abtragflächenpaares and the at least one further Abtragfiäche diverge from the insertion side towards the processing side. The divergent removal surfaces also form a prism-shaped support in the region of the insertion side and allow a reliable removal of force to the outside. In order to be able to install the bit holder on a milling roller tube both as a left and a right part at different positions, a particularly preferred embodiment of the invention provides that the at least one further removal surface is formed substantially symmetrically to the central transverse plane running in the direction of the central longitudinal axis of the insertion projection , Characterized in that the bit holder is designed symmetrically at its coming into contact with the base part surface areas of the Abtragflächen, equal load conditions are achieved in the different mounting positions.

Preferably, it may be provided that a further removal surface, at least in regions, forms the underside of a front apron of the chisel holder. The front apron usually covers a front portion of the base part and thus protects it against wear. The fact that now the front apron is also used for attaching the erosion surface, resulting in a compact design and it can be easily made the bit holder.

It can also be provided that a further removal surface at least partially forms the underside of a rear support lug. Under certain operating conditions, a large part of the forces is transmitted via the rear support lug. The level further removal surface offers reliable support here.

As already mentioned above, the removal surfaces of the removal surface pair and the further removal surface can form a trihedral support guide. Accordingly, the three removal surfaces form a pyramid with a triangular base as a support guide.

In order to be able to reliably intercept the transverse forces occurring during the machining operation, it is provided according to a variant of the invention that the surface normals of the abrading surfaces of the abrading surface pair are in each case aligned with their pointing tool feed seen chisel holder side. Accordingly, therefore, the Abtragflächen the Abtragflächenpaares are arranged, for example, when using the bit holder on a Fräswalzenrohr inclined to the axis of rotation of the Fräswalzenrohres. By this arrangement, the lateral forces can be reliably derived.

Reliable assembly of the bit holder in a base part is then possible even in rough construction site operation and confusing places, if it is provided that the removal surfaces of the Abtragflächenpaares include an obtuse angle, in particular in the range between 100 ° and 140 °. This design also prevents a jamming occurs even after a long period of use, in which possibly the Abtragflächen a piece far away from the support surfaces work off. Thus, the chisel holder can always be changed easily. In addition, this angular adjustment of the removal surfaces guarantees a safe removal of the machining forces. In particular, the variance of the machining forces during the tool engagement is taken into account.

A bit holder according to the invention can be such that the removal surfaces of the removal surface pair and / or the at least one further removal surface are at least partially interconnected via a transition section in the region of the insertion projection side. Accordingly, the ablation surfaces do not hit each other at the angle vertex, so that no sharp-edged angle transition occurs, which can be damaged. In addition, a Nachsetzbereich be created with the transition section and in conjunction with the base part. Accordingly, when the wear surfaces and / or the support surfaces of the base cereal work off, the bit holder can be continuously inserted into this reset space, with the wear surfaces always remaining applied to the support surfaces. In particular, the plane-surface plant is maintained even if in the existing base of the chisel hauler must be replaced with a new, and several times.

Particularly preferably, the plug-in approach is at least partially connected in the region of the Abtragflächen the Abtragflächenpaares and / or the at least one other Abtragflächen to the plug approach side. This allows a direct assignment of the removal surfaces to the insertion projection, which leads to a smaller component size and, moreover, offers an optimized force flow.

An inventive chisel holder may be characterized in that the longitudinal axis of the plug-in approach and the central longitudinal axis of the prism formed by the Abtragflächen the Abtragflächenpaars include an angle in the range between 100 ° and 130 °. Again, an optimal power flow is achieved by this design feature.

In a construction which provides a bit holder, for example a bore for receiving a machining tool, in particular a round shank bit, on the bit holder, it is optimally provided that the central longitudinal axis of the bit holder is arranged at least in regions between the removal surfaces of the abrasive surface pair. Thus, on the one hand a good force distribution the over the machining tool introduced Beareitungskräfte be achieved on both Abtragflächen. Furthermore, the bit holder can also be positioned in a different orientation to a Fräswalzenrohr, while maintaining the reliable power transmission is maintained.

It has been found that an optimal force distribution of the forces to be removed in longitudinal and transverse forces is achieved if it is provided that the angle between the central longitudinal axis of the prism formed by the Abtragflächen the Abtragflächenpaars and the central longitudinal axis of the chisel reception in the range between see 40 ° and 90 °, more preferably between 50 ° and 80 °. These angular positions also guarantee that the bit holder achieved due to the employment of the Abtragflächen the Abtragflächenpaares not too large width and thus a material-optimized construction is guaranteed.

According to a further embodiment variant of the invention, it may be provided that the bit receptacle merges into a flushing channel, and that the flushing channel emerges at least regionally in the region between the removal surfaces of the removal surface pair. The flushing channel is thus arranged so that the wear surfaces do not hit each other pointedly.

If it is provided according to a variant of the invention that in each case a first ablation surface of the Abtragflächenpaars and the at least one further Abtragfläche each other at an angle, preferably in the range between 100 ° and 140 °, are employed, and form a support area, then the chisel holder in a likewise correspondingly designed angular bit holder receptacle of the base part is used and stably supported therein. The opening angle reflects a wide range of directions from which forces can act during tool engagement and changes in the other parameters.

A particularly preferred variant of the invention is such that between the removal surfaces of the Abtragflächenpaares a bisecting the receiving plane is arranged, and that the longitudinal axis of the plug-in approach is arranged symmetrically to this plane. As a result of this symmetrical configuration, the bit holder can also be mounted on different mounting positions of a milling drum tube or the like, or has the advantage that one needs only one variant and does not have to work with left and right toolholders. Additionally or alternatively, it may be provided that the central longitudinal axis of the plug-in approach is in the angular range of -10 ° to + 10 ° to the bisector, which is formed between the central longitudinal axis of the Abtragflächen the Abtragflächenpaares and the other Abtragfläche. Thus, a uniform bias is applied during bracing of the chisel holder with the base part. It is particularly preferred that this angle range is from -2 ° to + 2 °.

The invention will be explained in more detail below with reference to an embodiment shown in the drawings. Show it:

Figure 1 shows a combination of a base part and a chisel holder in a perspective side view;

FIG. 2 shows the illustration according to FIG. 1 in an exploded view;

FIG. 3 shows the bit holder according to FIGS. 1 and 2 in a front view;

Figure 4 shows the bit holder according to Figures 1 to 3 in rear view;

FIG. 5 shows the bit holder according to FIGS. 1 to 4 in a side view from the left;

FIG. 6 shows the illustration according to FIG. 5 in a vertical section through the median transverse plane of the bit holder;

FIG. 7 shows the bit holder according to FIGS. 1 to 6 in a side view from the right and partly in section;

FIG. 8 shows a sectional profile marked Vlfl-VIII in FIG. 5; FIG. 9 shows a sectional profile marked IX-IX in FIG. 7;

10 shows a marked in Figure 7 with X-X cutting path;

FIG. 1 shows a plan view of the tool combination according to FIG. 1;

Figure 12 is a marked in Figure 11 with Xll-Xli cutting path;

FIG. 13 shows the bit holder according to FIG. 5 in front view;

Figure 14 shows the bit holder in rear view; and

Figure 15 shows the bit holder in a rotated side view.

FIG. 1 shows a tool combination consisting of a base part 10 and a bit holder 20. In this case, the bit holder 20 is exchangeably connected to the base part 10. The base part 10 has a solid base body 13, which has a lower Anschiussseite 11. This Anschiussseite 1 is concave, wherein the curvature is selected according to the outer diameter of a Fräswalzenrohres. Thus, the Basisisteii 10 can be placed with its connection side 11 on the outside of the Fräswalzenrohres and welded to this. The base body 13 has at the front a projection which is bounded laterally by inclined surfaces 14 and front side of inclined surfaces 15. The inclination surfaces 15 are set at an angle to each other and the inclined surfaces 14 connect at an angle to the inclination surfaces 15. This results in the front side an arrow-shaped geometry of the base part 10, which leads to a better clearing action of the base part 10. As FIG. 2 illustrates, an eißelhaiter receptacle 16 with a plug-in receptacle 16.7 is incorporated into the base part 10. In this case, the plug-in receptacle 16.7 penetrates the main body 13 completely and thus opens into the connection side 1. In the base part 10, a threaded receptacle 8 is incorporated, which opens into the receptacle 16.7 (see Figure 12). The bit holder holder 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. In this case, the support surfaces 16.1, 16.2 are each arranged at an angle to each other in each support surface pair. Furthermore, the support surfaces 16.1 are each employed to the support surfaces 16.2 in the angle), so that there is an obtuse Chiselhaiteraufnahme 16. In the transition region between the individual support surfaces 16.1 and 16.2 each Nachsetzräume 16.3, 16.4, 16.5 provided in the form of recesses. In the area of the Nachsetzraumes 16.5 a recess 16.6 is still provided, which creates a transition from the bit holder holder 16 to the threaded receptacle 18.

As can be seen further from FIG. 2, a surface 17 is formed around the entry into the threaded receptacle 18, which surface is delimited laterally by inclined surfaces, the inclined surfaces opening divergently toward the rear side of the base part 10. In this way, an easy cleanability of the surface 17 and thus a tool holder 43 of a pressure screw 40 is created. The pressure screw 40 has a threaded portion 41, with which it can be screwed into the threaded receptacle 18. Furthermore, the pressure screw 40 is formed with a pressure projection 42 in the form of a truncated cone-shaped pin, which is integrally formed on the threaded portion 41.

As FIG. 2 further shows, the bit holder 20 can be connected to the base part 10. The bit holder 20 has a support body 21, which is equipped with an apron 22 on the front side. The skirt 22 carries integrally formed a web 22.1, which ascends from the skirt 22 upwards. To the support body 21 and a projection 23 is integrally coupled, which terminates in a cylindrical portion 24. The cylindrical portion 24 is provided with wear marks, which are formed here as circumferential grooves 26. The cylindrical portion 24 terminates with a support surface 25 which concentrically surrounds the bore entry of a bit holder 27. The bit holder 27 merges with the support surface 25 via a chamfer-shaped insertion section 27.1.

As Figure 4 shows, the bit holder 27 is formed as a through hole. The support body 21 is provided with a rear-side recess, which serves as a flushing channel 28. The flushing channel 28 thus opens the bit receptacle 27 in the region of its bore outlet radially outward. Thus, during use of the tool 27 occurred in the bit holder Abraumpartikel be discharged through the flushing channel 28 radially outward.

FIG. 3 shows that the support body 21 has first contact surfaces 29.1 in the region of the skirt 22. This Abtragflächen 29.1 are mutually at an obtuse angle ει (see Figure 13) and are connected via a transition section 29.2 together. In this case, 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.

FIG. 4 shows that the support body 21 has second removal surfaces 29.4 pointing downwards on the back. The second removal surfaces 29.4 are at an angle ε ₂ to one another (see FIG. 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 region is formed between the second removal surfaces 29.4 through the flushing channel 28 and a transition section 29.5. The Abtragfiächen 29.1 and 29.4 each form Abtragflächenpaare in the form of a prism. In this case, these prisms have a central longitudinal axis MLL, which is formed in the bisector plane between the two first Abtragfiächen 29.1 and the second Abtragfiächen 29.4. 3 and 14, these bisecting planes are marked with W. The central longitudinal axis is indicated there with MLL, wherein the central longitudinal axis MLL can in principle lie at an arbitrary position within the bisecting plane.

FIGS. 3 and 4 show, in conjunction with FIGS. 13 and 14, that the first removal surfaces 29.1 and also the second removal surfaces 29.4 diverge from the insertion projection side toward the processing side. In the present example, the surface normals correspondingly converge on the removal surfaces 29.1, 29.4 from the insertion projection side toward the machining side. The surface normals thus converge in the region of the tool engagement point, in which the machining forces are introduced into the tool system.

For the purposes of the present invention, for example, the first Abtragfiächen 29.1 as Abtragfiächen the Abtragflächenpaars and one or both of the second Abtragfiächen 29.4 as a further Abtragfläche (-n) are interpreted. Conversely, the two second Abtragfiächen 29.4 can form the Abtragfiächen the Abtragflächenpaars and one or both first Abtragfiächen 29.1 then form the other Abtragfläche (-n). Subsequently, the terminology first / second ablation areas 29.1 / 29.4 continue to be used.

The use of two Abtragflächenpaare with the respective first and second Abtragfiächen 29.1 or 29.4 carries the variance of the processing forces during the tool engagement optimally into account. During tool intervention, a commaspan is created. This process not only changes the force amount, 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 rather derived via the removal surface pair formed by the first removal surfaces 29.1. As the tool engagement progresses, the direction of the machining force turns and is then increasingly diverted over the wear surface pair formed by the second wear surfaces 29.4. Accordingly, the angle γ '(see FIG. 5) must be formed between the removal surface pairs such that the variance of the machining force is taken into account, and this processing force always acts on the prisms formed by the removal surface pairs.

In FIGS. 3 and 9, the median transverse plane MQ of the chisel holder 20 is marked. The bit holder is constructed mirror-symmetrically to this median transverse plane MQ, so that it can be installed on a milling drum as a right or left part.

In Figures 3 and 4, the feed direction is marked with usual arrow representations. The bit holder sides are arranged transversely to the feed direction. The surface normals of the removal surfaces 29.1 and 29.4 thus point in each case toward their side of the bit holder viewed in the tool advance direction and downwards, as becomes clear from FIGS. 3 and 4. In Figure 5, this fact is shown again in side view.

However, the processing force acts not only in the direction of the image plane according to Figure 5, but also in the transverse direction. These transverse force components are then ideally intercepted via the angled setting (ε-ι, ε ₂ ) of the removal surfaces 29.1, 29.4. Since at the beginning of the tool engagement, the machining forces scatter less in the transverse direction, the angle ει can also be chosen smaller than ε ₂ .

FIG. 5 further shows that an insertion lug 30 is integrally formed on the support body 21 and via a rounding transition 29. 3 into the first removal surfaces 29 and the second Abtragflächen 29.4 passes. In this case, the insertion projection 30 is arranged so that it substantially, in the present case about 90%, in the region of the first Abtragflächen 29.1 connects to the support body 21. The plug-in projection 30 carries at the front two contact surfaces 31.1. These are, as Figure 3 reveals, formed as a convex curved cylindrical surfaces. The abutment surfaces 31.1 extend longitudinally and parallel to the central longitudinal axis M (see FIG. 5) of the insertion projection 30. The abutment surfaces 31.1 are therefore also parallel to one another. The contact surfaces 31.1 are arranged spaced apart in the circumferential direction of the plug-in projection 30. They have the same radius of curvature and are arranged on a common pitch circle. The curvature radius corresponds to half the circle diameter. In the area between the contact surfaces 31.1, a recess 31.2 is provided, wherein the contact surfaces 31.1 extend parallel to the recess 31.2. The recess can have a wide variety of shapes, for example a simple mirror. In the present Ausführungsbeispiei the recess 31.2 forms a Einmuldung which is concaved between the contact surfaces 31.1. The concavity is designed so that there is a part-cylindrical geometry. The recess 31.2 does not extend over the entire length of the plug-in projection 30, but only over a partial area, as shown in FIG. 13 reveals. The recess 31.2 is open to the free end of the plug-in projection 30, ie in the insertion direction. The recess 31.2 opens also undercut radially outward. Opposite the abutment surfaces 31.1, the insertion projection 30 has a pressure screw receptacle 32 on the back, 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 concave vaulted geometry, and in particular can form a partially cylindrical cross-section. In the figures 7 to 10, the design of the plug-in projection 30 is more detailed. FIG. 9 clearly shows the concave curvature of the recess 31 .2, which adjoins the convex contact surfaces 31. It is clear from FIG. 10 that the plug-in attachment 30 has essentially a circular or oval cross-sectional configuration in its region adjoining the contact surfaces 31.1. FIG. 8 illustrates the region of the pressure screw receptacle 32, wherein the pressure surface 32. 1 is set at an angle .delta. To the central longitudinal axis M of the insertion projection 30. In this case, this angle of attack δ is preferably in the range between 20 ° and 60 ° in order to achieve an optimal catching action of the bit holder 20.

FIG. 7 further shows that the pressure surface 32. 1 is arranged at a distance from the connection region of the insertion projection 30 to the support body 21 by the distance dimension A.

The Anfageflächen 31.1 are spaced by the distance B from the terminal portion of the insertion projection 30 to the support body 21. The centroid of the contact surfaces 31.1 is spaced by the distance C from the centroid of the pressure surface 32.1.

To mount the bit holder 20 in the base part 10 of the plug-in projection 30 is inserted into the socket 16.7. The insertion movement is limited by the first and second removal surfaces 29.1, 29.4, which abut against the first and second support surfaces 16.1, 16.2.

As can be seen from FIGS. 1 and 12, the assignment is made in such a way that the transition section 29.2 is above the Nachsetzraum 16.4, the Nachsetzraum 16.5 is bridged by the transition section 29.5 and the lateral Nachsetzräume 16.3 are bridged by the angle range between the first and second removal surfaces 29.1, 29.4 is formed. About the spacing of the Chisel holder 20 in the region of these Nachsetzräume 16.3, 16.4, 16.5 is achieved that during the machining operation of the bit holder 20 in the Nachsetzräume 16.3, 16.4, 16.5 can continue, when the Abtragflächen 29.1, 29.4 and / or the support surfaces 16.1, 16.2 work off. This is especially true when worn bit holder 20 are replaced with existing base member 10 against new. To fix the prescribed installation state, the pressure screw 40 is screwed into the threaded receptacle 18. In this case, the pressure paragraph 42 presses with its flat end face on the pressure surface 32.1 and thus causes a pull-in force acting in the direction of the central longitudinal axis M of the plug approach 30 At the same time, however, the pressure screw 40 is employed at an angle to the central longitudinal axis M of the plug approach 30, that also a force acting in the direction of the front clamping force is introduced into the plug-in projection 30. This clamping force is transmitted via the contact surfaces 31.1 in the corresponding concave counter surface of the cylindrical portion of the socket 16.7. The spacing of the abutment surfaces 31.1 via the recess 31.2 guarantees that the insertion projection 30 is reliably fixed by means of the two support regions formed laterally by the abutment surfaces 31.1. Thus, the occurring surface pressures are kept low, in particular via the two contact surfaces 31 .1, which leads to a reliable fixation of the plug-in projection 30.

Due to the fact that the bit holder 20 can be replenished in the Nachsetzräume 16.3, 16.4, 16.5 in Verschieißfall, an effective wear compensation can be made, the Abtragflächen 29.1, 29.4 project beyond the support surfaces 16.1, 16.2 at each point, so in case of wear anyway Support surfaces 16.1, 16.2 are worn evenly without creating a so-called beard or ridge. This embodiment is particularly advantageous when the base part 10, as is usually required, has a service life that lasts several life cycles of chisel holders 20. Unworn chisel haulers 20 can then always securely braced and held even at a partially worn base part 10 become. Thus, the repair of a machine in which the tool system formed from the base part 10 and bit holder 20 is used is also simple. Typically, a variety of tooling systems are mounted on such a machine, such as a road milling machine or a surface Mtner. In this case, the base part is usually welded on the surface of a Fräswalzrohrs. Now, if all or some of the bit holders 20 are worn, they can easily be replaced with new unworn or partially split bit holders 20 (which can be used, for example, for rough finishing work).

When replacing the pressure screw 40 is first released. Then the worn bit holder 20 can be pulled out with its plug projection 30 from the plug receptacle 16.7 of the base member 10 and removed. Subsequently, the new (or teilverschlissene) bit holder 20 is inserted with its plug projection 30 in the plug receptacle 16.7 of the base member 10. Now, the pressure screw 40 can be replaced if necessary against a new one. It is then screwed into the base part 10 and clamped in the manner described above with the bit holder 20.

FIG. 12 shows that the base part 10 carries a projection 50 which projects into the plug-in receptacle 16.7. This projection 50 is presently formed by a cylindrical pin which is driven from the connection side 1 1 ago in a part-cylindrical recess 19. The teiizylindrische recess 19 thereby surrounds the cylinder pin, by more than 180 ° of its circumference, so that it is held captive. The region of the cylindrical pin projecting into the bit receptacle 27 engages in the recess 31 .2 between the contact surfaces 31 .1. When inserting the plug-in projection 30 in the plug-in receptacle 16.7 threading the projection 50 in the open end of the plug-in projection 30 towards open recess 31 .2 reliably. An alignment of the bit holder 20 with the base member 10 is thus achieved. This alignment guarantees that now the first and second removal surfaces 29.1, 29.4 fit precisely to the abutment against the support surfaces 16.1, 16.2, so that a faulty assembly ge is excluded. Furthermore, the projection 50 and the geometrically adapted recess 31 .2 in the form of a key-lock principle prevent a wrong bit holder 20 from being inadvertently installed on the base part 10.

Hereinafter, the angle relationships of the chisel holder 20 according to the invention will be discussed in more detail.

FIG. 5 shows that the central longitudinal axis 24.1 of the bit receptacle 27 is at an angle α or φ to the longitudinal orientation of the transition sections 29.2 and 29.5 and thus also to the central longitudinal axis MLL of the prism formed by the first removal surfaces 29.1 and by the second removal surfaces 29.4. The angle α can be between 40 ° and 60 ° or φ in the range between 70 ° and 90 °.

FIG. 5 also shows that when the removal surfaces 29.1 and 29.4 are projected in a plane transverse to the feed direction (projection corresponding to FIG. 5), the removal surfaces 29.1 and 29.4 are angled at an angle γ in the range between 40 ° and 60 ° relative to one another, or the opening angle between the transition sections 29.2 and 29.5 in the longitudinal direction according to FIG. 5 is between 120 ° and 140 °. Accordingly, 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 ablation surfaces 29.1, 29.4, the first ablation surfaces 29.1 are at an angle β and the second ablation surfaces 29.4 are at an angle μ to the central longitudinal axis M of the insertion projection 30. The same also applies here to the central longitudinal axes MLL of the prisms. The angles β and μ may be in the range between 100 ° and 30 °, preferably in the range between 1 10 ° and 120 °. FIG. 13 shows that the first removal surfaces 29.1 enclose an angle ι. Preferably, this angle ει should be in the range between 100 ° and 120 °. The bisector of this Winkeis ι Hegt in a plane and Figure 13 illustrates that the plug-in projection 30 is arranged symmetrically to this plane.

In the same way, the rear second removal surfaces 29.4 are set at an angle ε ₂ corresponding to one another, as FIG. 14 shows. However, the angle ε _{2 may} deviate from the angle ει and in the present embodiment lie between 120 ° and 140 ° and the plug-in projection 30 is also arranged and equipped symmetrically to the bisector plane of this angle ε ₂ .

FIG. 15 shows that in each case 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 set at an angle ω to one another and form a support region.

Claims

claims

1. chisel holder for a ground processing machine, in particular a road milling machine, which has a chisel receptacle (27) in the region of a machining side and which indirectly or directly carries an insertion lug (30) on an insertion projection side of a support body (21), wherein the support body (21) two, a Abtragflächenpaar forming Abtragflächen [first or second Abtragflächen (29.1, 29.4)], which are at an angle to each other (ε · |, ε2 ₎ ,

characterized,

in that the support body (21) has at least one weathered removal surface (29.1, 29.4) which is at an angle (γ ^' , ω) to the two removal surfaces (29.1, 29.4) of the removal surface pair.

2. bit holder according to claim 1,

characterized,

that the two removal surfaces (29.1, 29.4) of the Abtragflächenpaars in the feed direction (V) of the chisel holder (20) at least partially in front of the insertion lug (30) and a further Abtragfläche (29.1, 29.4) at least partially against the feed direction (V) behind the insertion lug ( 30) are arranged, or

that the two removal surfaces (29.1, 29.4) of the Abtragflächenpaars opposite to the feed direction (V) at least partially behind the plug-in approach (30) and a further removal surface (29.1, 29.4) in the feed direction (V) at least partially in front of the insertion projection (30) is arranged.

3. bit holder according to claim 1 or 2,

characterized,

the two removal surfaces (29.1, 29.4) of the removal surface pair and the at least one further removal surface (29.1, 29.4) diverge from the insertion projection side in the direction of the processing side.

4. bit holder according to one of claims 1 to 3,

characterized,

in that the at least one further removal surface (29.1, 29.4) is designed essentially symmetrically to the median transverse plane (MQ) running in the direction of the central longitudinal axis (M) of the insertion projection (30).

5. bit holder according to one of claims 1 to 4,

characterized,

the at least one further removal surface (first removal surface (29.1)) forms the underside of a front apron (22) at least in regions.

6. bit holder according to one of claims 1 to 4,

characterized,

the at least one further removal surface (second removal surface 29.4) at least partially forms the underside of a rear support extension.

7. bit holder according to one of claims 1 to 6,

characterized,

that the removal surfaces (29.1, 29.4) of the Abtragflächenpaars and the other Abtragfläche (29.1 and 29.4) form a dreiflächige support guide.

8. bit holder according to one of claims 1 to 7,

characterized,

the surface normals of the removal surfaces (29.1, 29.4) of the removal surface pair point in each case to their tool holder side viewed in the tool advance direction (v).

9. bit holder according to one of claims 1 to 8,

characterized,

the removal surfaces (29.1, 29.4) of the removal surface pair enclose an obtuse angle (ε-j, £ 2), in particular in the range between 100 ° and 140 °.

10. bit holder according to one of claims 1 to 9,

characterized,

the removal surfaces (29.1, 29.4) of the removal surface pair and / or the at least one further removal surface (29.1, 29.4) are connected to one another in the region of the insertion projection side at least in regions via a transition section (29.2, 29.5).

11. chisel hauler according to one of claims 1 to 10,

characterized,

that the insertion projection (30) is connected at least partially in the area of the removal surfaces (29.1, 29.4) of the removal surface pair and / or the at least one further removal surface (29.1, 29.4) to the insertion projection side.

12. bit holder according to one of claims 1 to 11,

characterized,

the longitudinal axis of the insertion projection (30) and the median longitudinal axis (MLL) of the prism formed by the removal surfaces (29.1 ·, 29.4) of the removal surface pair enclose an angle (β, μ) in the range between 100 ° and 130 °. 3. bit holder according to one of claims 1 to 12,

characterized,

the central longitudinal axis (24.1) of the bit receptacle (27) is arranged at least in regions between the removal surfaces (29.1, 29.4) of the removal surface pair.

14. bit holder according to one of claims 1 to 13,

characterized,

that the bit receptacle (27) merges into a flushing channel (28), and that the flushing channel (28) emerges at least in regions in the region between the removal surfaces (29.4) of the removal surface pair.

15. Chiselike according to one of claims 1 to 14,

characterized,

in that in each case a first removal surface (29.1) of the removal surface pair and the at least one further removal surface (29.4) are set at an angle (ω), preferably in the range between 120 ° and 160 °, and form a support region.

16. bit holder according to one of claims 1 to 15,

characterized,

that between the Abtragflächen (29.1, 29.4) of the Abtragflächenpaars a bisecting the receiving plane is arranged, and that the longitudinal axis of the plug-in projection (30) is arranged symmetrically to this plane and / or

that the central longitudinal axis of the insertion projection (30) in the angular range of -10 ° to + 10 ° to the bisector, which is formed between the bisector of the Abtragflächen (29.1, 29.4) of the Abtragflächenpaars and the further Abtragfläche (29.1, 29.4).