CN1308568A - Method for producing a cutting plate for the chip-cutting Machining of metallic tools - Google Patents

Abstract

The invention relates to a method for producing a cutting plate for the chip-cutting machining of metallic workpieces, comprising the following steps: application of a powder layer containing crystals of diamond and/or cubic boron nitride or such like on a metal plate, preferably a hard metal plate; sintering of the powder layer on the metal plate; and grinding of at least one lateral face of the coated metal plate to produce at least one cutting edge. In a first step a cutting plate blank without cutting edge is produced. In a subsequent second step the cutting plate blank in the region in which the cutting plate(s) are to be situated is given a desired shape appropriate for the intended application. In this region the plate is then ground to produce at least one cutting edge.

Description

Method for manufacturing cutting plate for cutting metal tools

The invention relates to a method for producing a cutting plate for cutting metal tools in the general sense of claim 1 , as well as a cutting plate blank in the general sense of claim 6 and a cutting plate in the general sense of claim 9 .

Cutting plates and methods for their manufacture are known for cutting metal tools. Hereinafter, cutting plates are mentioned, which have a metal base carrier, such as a metal plate, and a crystallized wear-resistant layer combined with the carrier. . The wear-resistant layer comprises diamond crystals (polycrystalline diamond/PKD) and/or cubic boron nitride (CBN) crystals. This layer is preferably coated with a base layer of cemented carbide, which is then bonded essentially inseparably to the metal carrier by sintering. It is known, for example, to form a powder layer of the type described here in combination with a cemented carbide matrix at 1500° C. and 50 to 60 kbar.

To produce a cutting edge, one side of the metal plate provided with the wear layer is ground successively. If the cutting board is to have several cutting edges, then a corresponding number of sides must be ground.

In the known method described here, the coated metal sheet is either produced directly in the shape that the later cut sheet is to have. But it is also possible to use a larger metal sheet called a blank to be manufactured as described here, and to cut or shear it into a cutting plate, and then to grind the simultaneously formed side surface in this position, This produces the desired subsequent cutting edge.

This method is relatively expensive, and it is also costly in relation to warehouse storage.

It is therefore the object of the present invention to provide the method mentioned at the outset which does not have these disadvantages.

In order to accomplish this task, a method comprising the steps of claim 1 is proposed. The method is characterized in that in a first step of the method a cutting plate blank is produced which does not yet have its final shape. Such edges have not been specially formed on the blank, especially in those regions where the finished cutting plate should have one or several cutting edges. In order to be able to use such cutting board blanks as cutting boards, it is first necessary to bring the special points described here into the desired shape, which is adapted to the particular application, in the second step of the subsequent method. For example, the initially rectangular end region of the cutting plate blank should be triangular or have a point in order to be able to realize it as a threaded turning tool. The shaping of the regions provided for the machining of the cut-off sheet blank can be produced in any suitable form. Only in this way can the cutting plate blanks processed in this way be ground at the subsequent cutting edge regions.

Cutting plate blanks are not suitable for cutting metal tools directly after they are produced. This first appears essentially as a disadvantage, because the finished cutting plate can only be produced in the second step of the method, and before the cutting edge can be produced by side machining, the position where the cutting edge is to be is also required. Special machining and must be formed into a required shape. However, it has been found that cutting board blanks of the type described here can be produced in large quantities and can be supplied to an intermediate store without further sorting. Arbitrary blanks for special cutting plate manufacture can be obtained from a warehouse stock of unspecified cutting plate blanks, which are shaped in the final processing and prepared by grinding with at least one Cut edges.

A preferred embodiment of the method is characterized in that the cutting plate blank is brought into the desired shape by grinding in the region of at least one cutting edge. If the grinding method is carried out suitably, the machining of this region can be carried out in such a way that at least one cutting edge can be produced directly during the simultaneously generated side grinding profile. It is thus possible to integrate the additional second part of the method with the grinding process for the production of the cut edge and the required processing time for the production of the cut plate can be minimized.

Further embodiments of the method emerge from the remaining subclaims.

Furthermore, the object of the present invention is to provide cutting board blanks for the production of cutting boards which are distinguished by their production at an affordable price.

In order to achieve this task, a cutting plate blank is proposed with the features of claim 6 , which is characterized in that it initially has a non-specific shape. Therefore, the cutting board blanks are not emphasized consistent with a specific processing method, in other words, not for a specific tool form. There are no special organizational requirements for a storage warehouse for such non-special blank parts, so simplicity and affordability are achievable.

Further developments of the cutting plate blank are given by the remaining dependent claims.

The present invention is further elaborated below with reference to accompanying drawing:

Fig. 1 is the top view of cutting plate;

Figure 2 is a front view of the cutting board in Figure 1 and

FIG. 3 is a side view of the cutting board shown in FIG. 1 .

FIG. 1 shows a plan view of a cutting board 1 , which essentially has a rectangular basic shape. One of the longitudinal sides, here the upper side of the longitudinal side 3, is provided with projections 5 and grooves 7, both of which are for example substantially triangular in shape here, for the purpose of preparing them for sawtooth, which enables cutting Reliable fixing of the plate 1 in the tool is made possible. Due to the projections 5 and recesses 7 provided here on the longitudinal sides 3 , the cutting board 1 can be clamped at different positions in the tool and thus post-processing of the cutting board is ensured. Thus, if the cutting plate becomes dull, it can be re-tooled in this way for post-processing so it can continue to be used.

The cutting plate 1 is produced from a cutting plate blank 9 which essentially has the outer contour of the cutting plate 1, but which is initially substantially rectangular at the location 11 where the cutting edges 13 and 15 of the cutting plate 1 are located. , which is indicated by a dashed line in Figure 1.

In the exemplary embodiment of the cutting plate 1 described here, the cutting edges 13 and 15 are arranged in the area 11 symmetrically to an imaginary center line 17 and each form an angle with this center line of, for example, approximately 30°. Dotted line 19 shows that a cutting edge 13' extending across the entire height h of cutting plate 1 can also be provided, which is purely an example here and forms an angle of about 40° with center line 17. It is of course conceivable that the cutting edge 13' also extends in a mirror image of the central line 17.

The fact that the substantially rectangular region 11 of the cutting plate blank 9 can be adjusted to the desired cutting edge by means of a special cutting process will become clear without difficulty from the explanations repeated here.

FIG. 2 shows a front view of the cutting board 1 , ie a view of the area 11 .

This depiction clearly shows that the cutting plate 1 has a metallic base carrier, here a metal plate 21, preferably a cemented carbide plate. The hard material coating, ie the powder layer 23, is sintered onto the metal plate so that it does not detach substantially. The powder layer contains diamond crystals and/or cubic boron nitride crystals or the like. This layer is particularly hard, wear-resistant and resistant, which is illustrated by dots.

In the exemplary embodiment of the cutting board 1 described here, on the opposite side 25 of the powder layer 23 there is a bevel 27 which serves for a certain mounting of the cutting board 1 on a tool.

The side face 29 lying below in FIG. 2 is inclined with respect to the imaginary center plane E. As shown in FIG. It is inclined here from the surface 31 of the powder layer 23 relative to the central plane E at an acute angle, for example approximately 6°. The upper side 33 , which corresponds to the longitudinal side 3 ( FIG. 1 ), is parallel to the center plane E. In FIG.

Viewed from above, the front sides 35 and 37 are visible in the region 11 , which are ground to produce the cutting edges 13 and 15 . The depiction in FIG. 2 shows that the front sides 35 and 37 intersect in the area of the central plane E, thus forming a symmetry.

The side view of FIG. 3 shows the upper longitudinal side 3 of the cutting board 1 of FIG. 1 . The elements of the cutting board 1 described in FIGS. 1 and 2 are designated here with the same reference numerals, so that reference can be made to the description of FIGS. 1 and 2 .

As can be clearly seen from the depiction in FIG. 3 , the longitudinal sides 3 are provided with protrusions 5 and grooves 7 which extend along the overall thickness d of the cutting plate 1 and run substantially parallel to the back side 39 of the cutting plate 1 .

The cutting plate 1 contains a base carrier 21 and a powder layer 23 , which is likewise shown dotted here and is also clearly visible here.

The scribed lines here also indicate that certain parts of the cutting plate blank 9 are to be removed in this region 11 of the cutting plate 1 in order to form the cutting edge here.

The method for manufacturing the cutting plate 1 used for metal tool cutting will be discussed below.

In a first step of the method, a powder layer is applied to a base carrier 21, that is to say a metal plate, preferably a cemented carbide plate. The powder layer contains diamond crystals and/or cubic boron nitride crystals or the like. The powder layer is sintered on the base carrier 21 by sintering, for example at a temperature of 1500° C. and a pressure of 50 to 60 kbar, so that a non-detachable bond is formed.

The coated metal sheet can have from the start the shape of the cut sheet blank 9 described in FIGS. 1 and 3 . However, it is also possible to separate or cut off a cutting plate blank 9 of the type described here from a larger coated metal plate. The cutting process can be achieved by an etching method, preferably by a wire etching method. The projections 5 and recesses 7 may already be provided in the region of the longitudinal side 3 in this case.

The position 11 of the cutting plate blank is not specified, that is to say there is no special provision for the subsequent use of the cutting plate 1 . In the exemplary embodiment shown here of the cutting plate blank 9 it is provided that the blank is substantially rectangular in shape at the region 11 .

Cutting plate blanks 9 of this type do not require special warehouse consumption, since such blanks do not include special tools.

The position 11 of cutting plate blank 9 can be made into a certain shape according to needs, thus cutting plate turns right or left, thread cutting plate (see Fig. 1) or also to drill bit and/or to reamer as piercing chisel, Rotary chisels are available.

The region 11 of the cutting plate blank 9 can be formed into the desired shape by cutting and/or grinding. In this way, a plurality of sides can be formed, at least one of which can then be used for producing at least one cutting edge by a grinding method.

Overall, it is clear that due to the simple basic shape of the cutting plate blank 9 its production is very simple. This is of course particularly effective if a special shape of the longitudinal edges, here referred to as the longitudinal edges 3, is dispensed with. As a result, particularly rapid and cost-effective production of blank parts is possible. Warehouse storage of such "neutral" blanks, as mentioned above, also enables favorable prices. Finally, this shows that the machining of the cut-off sheet blank 9 at the point 11 is particularly simple. The additional method steps required for the production of the cutting plate 1 can likewise be realized quickly and inexpensively, and the shaping of the cutting plate blank at the point 11 can be carried out by means of a cutting method and/or a grinding method. And the latter method is particularly advantageous, and the required cutting edge has already been produced while the desired shape is produced, so that the additional cost of producing the finished cutting board 1 from the cutting board blank 9 can be minimized.

From the above, it is clear that the cutting board 1 can be used universally and comprehensively, because cutting edges of almost any geometric shape can be produced on the region 11 of the cutting board blank 9, and the blank 9 can be formed in this way generally. , so that it can be used in any tool and for different cutting processes. In order to make a universally comprehensive realization possible, the projections 5 and recesses 7 shown in FIG. 1 can also be provided on other faces of the cutting plate 1 . Finally, this shape can also be completely dispensed with in order to ensure a universal use of the cutting board blank 9 .

Finally, it should also be noted that the cutting board 1 can be stretched directly into a tool. It is also possible to weld the cutting plate to the base support and then stretch the support into the tool.

Claims (9)

1. A method for manufacturing a cutting board for metal tool cutting, comprising the following steps: - coating of a powder layer containing diamond crystals and/or cubic boron nitride crystals or the like on a metal plate, preferably cemented carbide, - sintering the powder layer on the metal plate, - grinding of at least one side of the coated sheet metal to produce at least one cutting edge, It is characterized by: - in the first step of the method a cut-off sheet blank without cutting edges is produced, - in the subsequent second step of the method, the cutting plate blank is formed into the appropriate shape required by the application in the area where the cutting plate is to be located, and - Grinding is carried out in this area in order to produce at least one cutting edge. 2. The method according to claim 1, characterized in that the cutting plate blank is cut from or cut out from the coated metal sheet. 3. The method according to claim 2, characterized in that the shearing process is carried out by an etching method, preferably a wire etching method. 4. The method according to one of claims 1 to 3, characterized in that the cutting edge is to be brought into the desired shape at its location by cutting and/or grinding. 5. The method as claimed in one of the preceding claims, characterized in that the metal plate is provided with an all-over continuous powder layer. 6. Cutting plate blank for producing a cutting plate for metal tool cutting, characterized in that it has a cutting-related non-specific shape in the region where the cutting edge is to be located. 7. Cutting plate blank according to claim 7, characterized in that the blank is cut and/or ground to form a plurality of sides, at least one cutting edge being produced from at least one of the sides by grinding. 8. Cutting plate blank according to claim 7, characterized in that at least one surface (longitudinal side (3)) is provided with elevations (5) and recesses (7). 9. A cutting plate for cutting metal tools manufactured by the method according to one of claims 1 to 5, characterized in that the cutting edges are formed so that these cutting edges can be used as piercing chisels, rotary chisels , thread cutting boards as cutting boards for drills and/or for reamers.

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