JPH0645304Y2 - Work rest and V block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a work rest that supports a round bar-shaped work piece in a V groove and a V block that measures the squareness of the work piece. This ensures that long-term accuracy is maintained.

(Prior Art) Conventionally, a work rest of this type has silver support pieces (23) (24) made of cemented carbide in a V groove (22) of a main body (21) as seen in FIG. 4, for example. Brazed this support piece (23) (2
The V-shaped surface is configured by 4).
The work piece is supported by sandwiching it from above and below using a pair of work rests.

Further, in the work rest used in the centerless grinding machine, in order to secure a long life, for example, as shown in Japanese Utility Model Publication No. 54-147792, a polycrystalline sintered body such as diamond or cubic boron nitride is used. It is known that these blocks are fixed to the main body at appropriate intervals, and cemented carbide is fixed between them to form a work sliding surface.

Furthermore, some V blocks are made of ceramics because they can withstand long-term use.

(Problems to be solved by the invention) In the work rest, however, the support pieces (23) and (24) provided in the V groove (22) of the main body (21) are made of diamond, cubic boron nitride, or the like. If a hard surface layer is formed, theoretically a long life can be secured. However, when the support pieces (23) and (24) are attached as shown in FIG. 4, there is a problem in that it is difficult to obtain a squareness because an overlapping portion is formed by the support pieces (23) and (24). The same applies to the V block.

Therefore, the present invention intends to improve the mounting structure of the support piece in order to solve this problem.

(Means for Solving the Problem) In the present invention, a hard surface layer made of a polycrystalline sintered body such as diamond or cubic boron nitride on a base metal of cemented carbide is provided in the V groove of the main body. This is an improvement on the premise of a work rest and a V block to which a pair of support pieces can be attached.

That is, a round bar-shaped positioning pin is arranged at the intersection of the V-grooves of the main body, and the end surface of the support piece on the side of the intersection of the V-grooves is configured to abut against this positioning pin. is there.

(Function) The work rest and the V block of the present invention support a rotating work piece with a hard surface layer made of a polycrystalline sintered body such as diamond or cubic boron nitride, or slide it to check for a gap. It is something to see. Therefore, even if the processed product is made of cemented carbide, wear is extremely small and a long life can be secured.

Further, the work rest and the support piece in the V block of the present invention are positioned by abutting the end face thereof with a positioning pin arranged at the intersection of the V groove. Therefore, if the parallelism between the hard surface layer and the groove surface of the V groove is taken out, high accuracy can be obtained.

(Example) Hereinafter, one example of the work rest of the present invention will be described with reference to the drawings.

In FIG. 1, (1) is a main body of a work rest having a block shape, and for example, two workpieces (2) are sandwiched by a V groove (3) between a pair of main bodies (1). It is supposed to be. If this processed product (2) is a small-diameter drill material made of cemented carbide, for example, the conventional cemented carbide support pieces (23) (24) attached to the V-groove (3) will show severe wear. is there.

Therefore, the supporting piece (4) in the present invention is one having a hard surface layer (4b) made of a polycrystalline sintered body such as diamond or cubic boron nitride on a base metal (4a) of cemented carbide. Has been done. And this support piece (4) is manufactured by an ultrahigh pressure generator.

Further, the supporting piece (4) is attached along the groove surface of the V groove (3), but at the time of positioning, one end of the supporting piece (4) has the V groove (3) as clearly shown in FIG. It is brought into contact with a round bar-shaped positioning pin (5) arranged at the intersecting portion.

Further, since the supporting piece (4) is not normally affected by heat at high temperature in the V groove (3), it is preferable to attach it by a low temperature brazing material or adhesive rather than silver brazing. This is because silver brazing may cause warping and hair cracks in the support piece (4) due to thermal influence.

Further, FIG. 3 shows an example applied to the V block. In this case, a large number of supporting pieces (4) are arranged in the V groove (3) formed in the main body (11) of the V block. And, at the intersection of the V groove (3),
A positioning pin (5) is arranged so that one end of the support piece (4) abuts. The support piece (4) is
Similar to the work rest, a hard surface layer (4b) made of a polycrystalline sintered body such as diamond or cubic boron nitride is provided on a base metal (4a) of cemented carbide.

(Effect of the Invention) As described above, the present invention has a hard surface layer (4b) made of a polycrystalline sintered body such as diamond or cubic boron nitride.
A work rest and a V block are constructed by applying a positioning pin (5) at the intersection of a support piece (4) and a V groove (3) provided on a base metal (4a) of cemented carbide. Therefore, it has the following effects.

Firstly, long-term life and long-term accuracy maintenance can be expected. This can be explained using the example of a work rest that has a difference in performance. If the rotating work piece (2) is used as the material for the carbide small diameter drill, the conventional product shown in Fig. 4 can operate continuously for 24 hours for one month. The wear was about 0.11 mm, whereas the wear of the product of the present invention was barely seen at 6 months. In the present invention, the support piece (4) is adhered with an adhesive made of epoxy resin, the total thickness of the support piece (4) is 2 mm, and the hard surface layer (4b) is diamond fired. It should consist of a unity and its thickness
It is set to 0.7 mm.

Secondly, the assembling is easy and the assembling accuracy can be secured. This is because the presence of the locating pins (5) facilitates the attachment of the support piece (4) and also the hard surface layer (4).
This is because the parallelism between the groove surfaces of b) and the V groove (3) need only be precise, and this work can be performed relatively easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a work rest of the present invention, FIG. 2 is a partially enlarged front view showing a main part, and FIG.
FIG. 4 is a perspective view showing an embodiment of a V block, and FIG. 4 is a partial front view showing a main part of a conventional work rest. (1) (11) …… Main body, (3) …… V groove (4) …… Supporting piece, (4a) …… Base metal (4b) …… Hard surface layer, (5) …… Positioning pin

Claims (2)

[Scope of utility model registration request] 1. A pair of support pieces (4) are attached along the groove surface in a V groove (3) of a V block-shaped main body (1), and these support pieces (4) are In a workrest in which a V-shaped surface is constituted by a surface portion, the support piece (4) is a base metal (4a) of cemented carbide and a surface of the base metal (4a) includes a diamond and a cubic crystal. It has a hard surface layer (4b) made of a polycrystalline sintered body such as boron nitride, and the end face on the crossing side of the V groove (3) is in contact with a round bar-shaped positioning pin (5). Characteristic work rest. 2. A V-block constructed by replacing the work rest body (1) according to claim 1 with a V-block body (11).