JPS5916911A - Superhigh-tension sintering blank for tip - Google Patents

Abstract

PURPOSE:To provide a blank for tip capable of easily obtaining chip without high cost cutting machining, by previously specifically providing plural chip breakers in the blank for tip which is divided after sintering, in a body, the superhigh-tension sintering body made tool edge construction body on a pedestal body. CONSTITUTION:Four pieces of concave grooved chip breakers 4 are, at equal intervals, formed in circumferential direction on the surface of construction body 3 constructed by a method wherein tool edge construction bodies 3 such as cubic boron nitride, diamond, etc. are, in a body, sintered on the upper surface of pedestal 2 made from cemented carbide alloy on steel, etc. in the blank for tip 1. Respective breakers 4 are all of the same shape and of the same size and of almost fan shape of which the width in plane view becomes narrower from peripheral side to central side of the blank 1. Such blank 1 is longitudinally transversely divided by four equal parts between respective breakers 4 and this superhigh-tension sintering body tip 5 can be obtained. Each tip 5 has respectively one piece of breaker 4 and the fringe of breakers 4 is so arranged as to go along the fringe of tip 5.

Description

[Detailed description of the invention] The present invention relates to an ultra-high pressure sintered chip material.

Generally, in ultra-high pressure sintered chips in which the cutting blade structure is sintered integrally on the top surface of the pedestal, the ultra-high pressure sintered compact that makes up the cutting blade structure is very expensive, so the size of the chip is The height is made as small as possible within the size range required for actual cutting, and is usually about the size of a cemented carbide tip of about //S to ///θ.

Therefore, when manufacturing this type of ultra-high pressure sintered chips, it is necessary to first manufacture a chip material several times the size of the individual chips actually used, and then divide this chip material. I try to get individual tips. This is intended to improve the productivity of ultra-high pressure sintered chips.

By the way, conventionally, the upper surface of the chip material, that is, the upper surface of the cutting blade structure, has been a mere flat surface. Therefore, when actually using the ultra-high-pressure sintered chips obtained by dividing this chip material, it is necessary to (1) use it without a chip breaker, and (2) fix other members to the upper surface of the cutting blade structure. (2) Forming chip breaker grooves on the upper surface of the cutting blade structure by grinding.

However, when used in this manner, there are the following problems. That is, in the case of ■, the chip disposal performance is poor and it cannot be used depending on the cutting conditions. Also,
In the cases of (1) and (2), it is difficult to form a chip breaker having a complicated concave-convex curved surface that is optimal for dividing the cut, and a great deal of labor and cost are required to form the chip breaker.

Furthermore, in the case of (2), the ultra-high pressure sintered chip is fixed to another support member to form a throw-away chip, and when the indexable chip is clamped, other members may get in the way of the clamp. In addition, there is a risk of interference with the workpiece during cutting, which may complicate the clamping mechanism or limit the range of cutting. In the case of (2), the ultra-high-pressure sintered body forming the cutting blade structure is very hard and has poor grindability, so there are problems such as particularly high chip costs.

This invention makes it possible to easily and inexpensively obtain an ultra-high pressure sintered chip having a surface designed to solve the above problems.4. The purpose of the present invention is to provide an ultra-high pressure sintered chib material that can prevent the clamping mechanism from becoming complicated and the cutting range from being narrowly limited.

The feature of this invention is that a plurality of chip breakers are formed on the top surface of the cutting blade structure so that when the ultra-high pressure sintered chip material is divided, a chip breaker exists on the top surface of each cutting blade structure. At the point.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that FIG. 1 is a plan view of the ultra-high pressure sintered chip material according to the present invention, and FIG. 1 is a side view thereof from below.

Reference numeral 1 in the figure is an ultra-high pressure sintered chip material (hereinafter abbreviated as chip material). This chip material 1 is the pedestal 2
and a cutting blade structure 3 integrally sintered on the upper surface of this pedestal 2.
It consists of As the material of the base 2, cemented carbide or steel is used, and on the other hand, as the material of the cutting blade structure 3, cubic boron nitride, -diamond, or a mixture thereof is used. Further, on the upper surface of the cutting blade structure 3, a number of concave chip breakers 4 are formed at equal intervals in the circumferential direction. All of the concave grooves have the same shape and size, and in plan view, the width becomes narrower from the outer circumferential side to the center of the chip material 1, so that it has a substantially fan-like shape.

Note that when molding the chip material 1 using a press die, the groove chip breaker 4 is formed at a position corresponding to the position of the press die where the groove chip breaker 4 is to be molded. This is done by forming a convex portion with a shape corresponding to the shape.

Then, as shown in FIG. 3, the chip material 1 sintered in this manner is equally divided vertically and horizontally between the grooved chip breakers 4 to obtain an ultra-high pressure sintered body 5. Therefore, each divided ultra-high pressure sintered chip 5 has a concave groove chip breaker for each section. Moreover, the periphery of the concave groove chip breaker 4 is arranged along the periphery of each ultra-high pressure sintered chip 5.

Next, a nose portion is formed at the intersection of the two ridge lines formed by dividing this ultra-high pressure sintered compact chip into 50 pieces. As shown in FIGS. 7 and 3, the ultra-high pressure sintered chip 5 is placed in one corner of a square support member 7 made of cemented carbide or steel, and the nose portion 6 is placed on the support member 7. Align it with the corner of and fix it by brazing. This results in a rectangular throwaway number 5! Obtain T1.

Further, FIGS. 6 to 2 show other embodiments of the present invention, in which Figure 81 is a plan view of the chip material, and FIG. 7 is a side view from below. In this chip material 1,
Four chip breaker grooves 14 having a generally triangular shape in plan view are formed on the upper surface of the cutting blade structure 3 at equal intervals in the circumferential direction with each of the four - corner portions facing the center. Moreover, a notch 18 is formed on the upper surface of the cutting blade structure 3, extending between the chip breaker grooves 140 and dividing the chip material 1 into equal parts. This notch 18 is formed at the same time as the chip material 1 is sintered, and can be formed by forming a protrusion in a shape corresponding to the notch 18 on a press mold. may have a so-called perforation shape, and its cross-sectional shape is preferably approximately U-shaped or approximately ■-shaped.

Next, the chip material 1 is divided by grinding along the notches 18. At this time, the amount of the cutting blade structure 3 removed by grinding is reduced by the amount of the notch 18, so that the working time required for dividing can be shortened and the chip cost can be reduced. Moreover, since the notch 18 serves as a guideline for dividing, division becomes even easier. Regarding ease of division, if a notch is formed at a location corresponding to the notch 18 on the lower surface of the pedestal 2, it can be broken manually.

Thereafter, in the same manner as in the embodiment described above, the nose portion 6 is formed and fixed to the support member 7 by brazing to obtain a triangular indexable tip T2 (see Fig. 1 and Fig. 2).

In addition, in each of the above embodiments, the chip breaker 4.1
4 are all the same shape and the same size, but they are not limited to this, and may have mutually different shapes and different sizes.

In addition, the chip breaker is not limited to a groove-shaped one, and the chip breaker is not limited to a groove-shaped one, but can be used for each chip breaker.
Although it is divided so that there are individual chip breakers 4 and 14, the present invention is not limited to this, and it may be divided so that there are a plurality of chip breakers. Furthermore, the individual ultra-high pressure sintered chips 5 may have different shapes and sizes.

Further, in each of the above embodiments, the ultra-high pressure sintered chip 5 is fixed only to one corner of the support member 7, but the present invention is not limited to this, and it may be fixed to all corners of the support member 7. good. Further, the ultra-high pressure sintered chip 5 is fixed to the support member 7, and the indexable chip T1. Although T2 is obtained, a cutting tool with an ultra-high pressure sintered tip may be obtained by brazing the cutting tool body.

As explained above, according to the chip material of the present invention,
Since multiple chip breakers are formed on the top surface of the cutting blade structure at the same time as the chip material is sintered, it is possible to easily form a chip breaker with a complex uneven curved surface that is ideal for breaking up chips. Therefore, by dividing this chip material, it is possible to easily and inexpensively obtain ultra-high-pressure sintered chips that have excellent cutting waste and current performance. In addition, since there is no need to fix other parts to the top surface of the cutting blade structure in order to form a chip breaker, an indexable chip can be created using ultra-high pressure sintered chips obtained by dividing this chip material. When created, effects such as being able to reliably prevent the clamping mechanism of the indexable tip from becoming complicated or the cutting range being limited can be obtained.

[Brief explanation of the drawing]

Figures 1 to 8 show one embodiment of the present invention.
The figure is a plan view of the chip material, the first figure is a side view of the lower side, and the third figure is a plan view showing the chip material in a divided state.
Fig. 7 is a plan view showing an indexable tip formed by brazing and fixing an ultra-high pressure sintered chip to a support member, Fig. 8 is a sectional view taken along the line ■-V in Fig. 7, and Figs. Figure 2 shows another embodiment of the present invention, Figure 6 is a plan view of the chip material, Figure 7 is a side view from below, Figure 2 is a view similar to Figure 9, and Figure 2 is a plan view of the chip material. 1 is an enlarged cross-sectional view taken along the line {circle around (2)} in the figure. 1...Ultra high pressure sintered chip material, 2...
・Pedestal, 3... Cutting blade structure, 4... Kawaguchi groove chip breaker, 5... Ultra high pressure sintered chip, 1
4...Chip breaker groove, 18...Notch. Applicant Mitsubishi Metals Corporation

Claims (1)

[Claims] An ultra-high pressure sintered chip material characterized in that a plurality of chip breakers are formed on the top surface of each cutting blade structure so that when divided, a plurality of chip breakers are formed on the top surface of each cutting blade structure. . The ultra-high pressure sintered chip material according to claim 1, wherein a notch is formed on the upper surface of the cutting blade structure along the portion to be divided.