JPS6224903A - Compound cutting tool - Google Patents

Abstract

PURPOSE:To make it possible to grind the cutting edge of a compound tool cutter, by forming stepped parts on side surfaces of a base metal in the rear of a cutting edge section made of high hard sintered materials to obtain side surface relief margins. CONSTITUTION:A cutting edge section 2 made of ultra hard sintered materials is bonded to a recess section 3 in a base metal 1. Further, in order to form a new cutting edge C or a reground cutting edge C' is formed in the cutting edge section2, side surface relief margins 6, 6 are previously formed on side surfaces 1a, 1a of the base metal 1 in the rear of both side surfaces 2a, 2a of the cutting edge section 2 by means of stepped parts 7, 7, being equal to or greater than a grinding margin for the cutting edge section 2 at one time or several times, and relief margins 8, 8 corresponding to the one time grinding margin of the cutting section 2 are formed on both side surfaces 1b, 1b of the base metal 1 directly below the cutting edge section 2. Due to the provision of th relief margins 6, 6 a grind stone does not make into contact with the side surfaces 1a, 1b of the base metal 1 during grinding of the cutting edge section 2, and further due to the provision of relief margins 8, 8 no cutting is made to the base metal 1 only when the new cutting edge C is ground.

Description

[Detailed description of the invention] A0 Purpose of the invention (1) Industrial application field The present invention provides a cutting edge made of a high-hardness sintered body hot-pushed under ultra-high pressure and high temperature, and a cutting edge made of cemented carbide, steel, etc. This relates to a composite tool (throw-away tip) that is bonded to an alloy.

(2) Prior Art Conventionally, the above-mentioned compound tool for cutting has been proposed, for example, in Japanese Patent Application Laid-Open No. 54-73
This method is disclosed in Japanese Patent Application Laid-open No. 389 and Japanese Patent Application Laid-open No. 75907/1983.

(3) Problems to be Solved by the Invention By the way, how to form a new cutting edge on the cutting edge of such a composite tool, and how to re-grind the worn cutting edge after use for cutting to form a cutting edge again. Generally, the cutting edge of a compound tool is ground with a grindstone, but since the cutting edge is made of a high-hardness sintered body such as diamond (DIA) or cubic boron nitride (CIJN), The hardness is extremely high (to grind the cutting edge part, a special grindstone with high hardness and fine mesh is required. For example, a fine diamond grindstone ($1,000 to $1,500) is used.

However, in conventional composite tools, the side surface of the alloy and the grinding surface of the cutting blade are the same as the road surface, so when grinding the grinding surface of the cutting blade with the grindstone, the outer surface of the alloy must also be ground at the same time. become. However, since the base metal has a lower hardness than the cutting edge, the grinding wheel for grinding the flank of the cemented carbide base metal is, for example, a coarse diamond grindstone ($200-32
o) is sufficient, and since the grinding area of the alloy is overwhelmingly larger than that of the cutting edge, the grindstone has a high hardness and fine grinding (formed) is suitable for grinding the cutting edge. Grinding causes clogging early and normal grinding cannot be expected.
The cutting edge made of sintered body generates heat, which causes cranking and chimping of the carefully ground cutting edge.Furthermore, compared to the high hardness cutting edge, the low hardness alloy has a hardness of 0.03 to 0.
There is a tendency for grinding to be as deep as 0.5 mm, which means that low-hardness parts must be ground that much more, which causes the problem of clogging of the grindstone and making it even heavier.

The present invention has been made in view of the above-mentioned circumstances, and aims to solve the above-mentioned problems by making it possible to grind the cutting edge made of a high-hardness sintered body without grinding the alloy behind the cutting edge. The object of the present invention is to provide a composite tool for cutting.

Another object of the present invention is to provide a cutting compound tool in which the grinding limit during re-grinding of the cutting edge portion can be easily determined.
This is the purpose.

B0 Structure of the Invention (Means for Solving 11 Problems) According to the first invention, a polygonal alloy made of cemented carbide or the like, and a high-height diamond sintered body or the like bonded to the corners of this alloy. In a cutting composite tool comprising a cutting edge made of a hard sintered body, the cutting edge is ground through steps 2 on both sides of the base metal behind both sides of the cutting edge. Forms a side clearance equal to or greater than that.

According to the second aspect of the present invention, the cutting edge is composed of a polygonal alloy made of cemented carbide or the like and a high-hardness sintered body such as a diamond sintered body bonded to the corners of this alloy. In the composite cutting tool, a side relief allowance equivalent to a limit grinding allowance during re-grinding of the cutting edge portion is formed on both side surfaces of the base metal behind both side surfaces of the cutting edge portion.

(2) Effect According to the configuration of the first invention, without grinding both sides of the alloy behind both sides of the cutting edge made of a high-hardness sintered body,
The cutting blade can be hot ground.

Further, according to the configuration of the second invention, it is easy to determine the re-grinding limit when re-grinding the cutting edge portion.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

First, the first embodiment of the first invention will be described with reference to FIG. It is constructed by adhesively bonding the parts 2 together.

The base metal 1 is made of cemented carbide (Zrv=1,700-2,4
00) or tool steel (Hv=450-900), and a recess 3 for adhesively bonding the cutting edge 2 is formed in the upper half of one corner thereof. The recess 3 is open at the top and both sides, and has a substantially horizontal bottom wall 4 and a substantially vertical front wall 5. Further, the base metal 1 is formed in a so-called "positive" manner, with its front surface being inclined with respect to its upper surface.

The cutting edge portion 2 is made of a diamond (DIA) sintered body (〃υ
=s, ooo ~ 10,000), cubic boron nitride (CB
N) It is made of a super hard sintered body such as a sintered body (H1+=4,000 to 4,500) and is adhesively bonded to the recess 3 of the base metal 1.

By the way, when forming a new cutting edge C1 on the cutting edge portion 2 or a cutting edge C/Y by re-grinding after wear, the cutting edge portion 2
It is necessary to grind both sides 2α and 2α with a whetstone, but
A cutting blade 201 is attached to both sides 1α, 1α of the base metal 1 behind both sides 2α, −2α of the cutting blade 2 via steps 7, 7.
A side relief allowance of 6°6, which is equivalent to or more than the grinding allowance of one or more times, is formed in advance (and the cutting edge part 2
On both sides 1h, 1h of the base metal 1 at the bottom, reliefs 8, 8Z equivalent to one grinding allowance of the cutting edge 2 are formed.

For example, when the base metal 1 is made of cemented carbide, the relief allowance 6
．． 6, 8.8 is a rough diamond whetstone (from $220)
320).

A mounting hole 10 with a taper 9 is bored in the center of the base metal 1 to attach the base metal 1 to a holder (not shown).

By the way, when forming a new cutting edge C on the cutting edge part 2 or a cutting edge C' again after the cutting edge part 2 has worn out, both sides 2α and 21' of the cutting edge part 20 are ground with a grindstone. On both sides 1α, 1α of metal 1, behind the cutting edge 2, there is a side relief allowance 6, which is equal to or larger than the grinding allowance.
6 is formed, the grindstone does not come into contact with the side surfaces 1α, 1α of the base metal 1 when grinding the cutting edge portion 2 (the side surfaces 1α
.

There is no need to grind 1α. Furthermore, relief allowances 8, 8 corresponding to the grinding allowance for one time are formed on both side surfaces 1b, 1b of the base metal 1 directly below the cutting edge 2, so that the cutting edge 2 is ground for the first time, that is, for a new grinding process. It is not ground by the grindstone only when cutting edge c2 is ground.

As described above, a new cutting edge C1 or cutting edge C is added to the cutting edge portion 2.
When grinding the cutting edge C' again after the wear of the cutting edge C', it is necessary to grind both sides of the base metal 1 which has a relatively thick area (and has a lower hardness than the cutting edge 2) rearward of the cutting edge 2. Since there is no need to grind 1α and 1α, there is no change in the grinding conditions of the cutting edge 2 (uniform grinding is possible, and there is no fear of premature clogging of the grindstone).

The reason why the relief allowance 8.8 corresponding to the first grinding allowance of the cutting edge part 2 is formed on both side surfaces 1b and 1a of the base metal 1 directly below the cutting edge part 2 is that the cutting edge part 2 is This is because a large bonding area B to the base metal 1 is ensured to increase their bonding strength, and the areas of both side surfaces 1b, 1b are relatively small so that they have little effect on the cutting conditions of the grindstone.

FIG. 3 shows a second embodiment of the first invention, in which a cutting blade 2 made of a high-hardness sintered body is hot-pressed and integrally bonded onto a substrate 11 made of cemented carbide, steel, etc. , its substrate 11
is bonded to the recess 3 which is deeper than that of the first embodiment by brazing or adhesive, and the relief allowances 8, 8 directly below the cutting edge 2 are formed across the substrate 11 and the base metal 1. .

4 and 5 show a third embodiment of the first invention.

In this third embodiment, the cutting blades 2 are connected to the four corners of a square base metal 1, respectively, and the other configurations are the same as in the first embodiment.

Is Fig. 6 the fourth embodiment of the first invention? In this example, cutting blades 2 are connected to each of the four corners of a square base metal 1, and the other configuration is the same as that of the second embodiment shown in FIG. 3.

7 and 8 show a fifth embodiment of the present invention.

In this fifth embodiment, a cutting blade part 2 is fixed to one corner of a square base metal 1, and both side surfaces 1b, 1b of the base metal 1 directly below this cutting blade part 2 are It is formed flush with both side surfaces 2α, 2α of the portion 20, and the relief allowance for one-time grinding shown in the first to fourth embodiments is not formed.

In this embodiment, the joint area between the base metal 1 and the cutting edge portion 2 is expanded, and the strength of their joint is further increased.

In this case, from the beginning of grinding a new cutting edge Cy on the cutting edge 2, both sides 1b and 1b of the base metal 1 directly below the cutting edge 2 are ground, but the grinding area is relatively small. , will not adversely affect the grinding conditions or cause the grindstone to become clogged early.

FIG. 9 shows a sixth embodiment of the first invention. In the fifth embodiment, the substrate 11 is made of cemented carbide, steel, etc.
The cutting blade 2 made of a high-hardness sintered body is hot-pressed and integrally bonded to the top, and the substrate 11 is bonded to the formed recess 3 by brazing or adhesive. The relief allowance 8.8 is not formed on either the substrate 11 or the base metal 2.

FIG. 10.11 shows a first embodiment of the second invention.

The cutting composite tool is constructed by adhesively bonding an isosceles triangular cutting edge portion 22 to one corner of a square base metal 1.

The base metal 1 is made of cemented carbide (Hυ=1, 700~2.4
00) or tool steel (Hv-450 to 900), and the cutting edge portion 2fj is in the upper half of one corner. 0:
A recess 3 is formed for adhesive bonding. This recess 3 is open at the top and both sides, and has a substantially horizontal bottom wall 4.
and has a nearly vertical front fall. Further, the base metal 1 should be formed in a so-called "positive" manner, with the front side and top surface inclined relative to each other.

The cutting edge portion 2 is made of a diamond (DIA) sintered body (11
tr-s, ooo~to, ooo cubic boron nitride z, (
It is made of a super hard sintered body such as a sintered body (CBN) (Hv = 4,000-4,500) and is adhesively bonded to the recess 3 of the base metal 1.

By the way, when forming a new cutting edge C1 or a cutting edge C/y by re-grinding after wear on the cutting edge portion 2, it is necessary to grind both sides 2α, 2α of the cutting edge portion 20 with a grindstone. Both sides 1α and 1α of the base metal 1 behind both sides 2α and 2α of the blade part 2 are coated with 4%N-1h or more equivalent to the limit grinding stock of the cutting edge 2 through a step 7.79 to the side surfaces. Escape fee 61
．． 6. ? A relief allowance 8.8, which is equal to or larger than the grinding allowance for 201 times of the cutting edge, is formed in advance on both sides 1b, 1b of the base metal 1 below the cutting edge 2. (.

A mounting hole 10 with a taper 9 is bored in the center of the base metal 1 to attach the base metal 1 to a holder (not shown).

By the way, when forming a new cutting edge C on the cutting edge portion 2 or forming a cutting edge C/shade again after the cutting edge portion 2 has been worn, both sides 2α, 2α of the cutting edge portion 2 are ground with a grindstone. , At that time, both side surfaces 1α, 1α of the base metal 1 rearward of the cutting edge portion 2 are provided with a side relief allowance equal to the limit grinding allowance 6. ．． 6. is formed, so when grinding the cutting edge part 2, the grindstone is pressed against the side surface 1α.
, 1α (there is no need to grind the side surfaces 1α, 1α). Also, both sides I of the base metal 1 directly below the cutting edge 2
Since a relief allowance of 8°8 corresponding to one grinding allowance is formed in A and 1b, the cutting edge portion 2 is not ground by the grindstone only when the cutting edge 2 is ground for the first time, that is, when a new cutting edge Cy is ground.

As described above, a new cutting edge C1 or cutting edge C is added to the cutting edge portion 2.
When cutting the cutting edge C/Y/ again after the wear of the cutting edge C/Y/ Since the surfaces 1α and 1α are not ground, uniform grinding is possible without changing the grinding conditions of the cutting edge 2, and there is no fear of early clogging of the grindstone.

The reason for forming relief allowances 8, 8 corresponding to the first grinding allowance of the cutting edge 2 on both side surfaces 1b, 1b of the base metal 1 directly below the cutting edge 2 is that the cutting edge 2 is This is because a wide bonding area to the base metal 1 is ensured to increase the bonding strength thereof, and the areas of both side surfaces 1b and -1b are relatively small so that they have little effect on the cutting conditions of the grindstone.

FIG. 12 shows a second embodiment of the second invention, in which two cutting blades made of a high-hardness sintered body are bonded integrally on a substrate 11 made of cemented carbide, steel, etc. The board 1
1 is bonded to the recess 3 which is deeper than that of the first embodiment by brazing or gluing, and the clearance 8° 8 directly below the cutting edge 2 is formed across the substrate 11 and the base metal 1. Figures 13 and 14 show a third embodiment of the second invention. In this third embodiment, cutting blades 2 are respectively connected to the four corners of a square base metal 1, and the other configuration is similar to that of the first embodiment shown in FIGS. 10 and 11. is the same as

FIG. 15 shows a fourth embodiment of the second invention, in which cutting blades 2 are connected to each of the four corners of a square base metal 1, and the other configuration is as shown in FIG. 12. This is the same as that of the second embodiment shown in FIG.

Although not shown, the second invention is also the same as the fifth embodiment shown in FIGS. 7 and 8 and the sixth embodiment shown in FIG. 9 of the first invention (of course, it can be implemented).

For the above 1. In the embodiment of the second invention, the base metal 1 may be formed in a triangular or other polygonal shape (the first
The cutting edge 2 is attached to one corner or to a plurality of corners.

Further, the metal-containing NC may not have the mounting hole 10 (in this case, the base metal 1 is fixed to the holder with a suitable clamp).

C8 Effects of the Invention As described above, according to the first invention, the grinding allowance is equal to or greater than the grinding allowance on both sides of the cutting edge through a step on both sides of the alloy behind both sides of the cutting edge. Since the side relief allowance is formed, there is no need to grind the alloy when forming the cutting edge on the cutting edge using a grindstone, or even if there is, the grinding condition of the cutting edge should be uniform. Efficiently (quickly grind) a normal cutting edge on the cutting edge.In addition, the grindstone does not grind alloys with a lower hardness than the cutting edge, or even if it grinds, there is very little Clogging is reduced as much as possible, and its lifespan can be extended.

Further, according to the second invention, on both sides of the base metal behind the rear end edge of the inner surface of the cutting edge, a side relief equal to the limit grinding allowance when re-grinding both sides of the cutting edge is provided. Since we have formed a generation,
In addition to the effects of the first invention, the limit grinding allowance of the cutting edge can be easily determined.

[Brief explanation of the drawing]

Are Figures 1 to 9 an embodiment of the first invention? The first,
Fig. 2 shows a first embodiment of the first invention, Fig. 1 is a plan view of the composite tool of the first invention, Fig. 2 is a side view thereof, and Fig. 3 shows a second embodiment of the first invention. , side view of the composite tool of the present invention, No. 4
, 5 show the third embodiment of the first invention, FIG. 4 is a plan view of the composite tool of the invention, FIG. 5 is a side view thereof, and FIG.
The figure shows the fourth embodiment of the first invention, a side view of the composite tool of the invention, and FIGS. 7 and 8 show the fifth embodiment of the first invention. 7 is a plan view of the composite tool of the present invention, FIG. 8 is a side view thereof, and FIG. 9 is a side view of the composite tool of the present invention, showing a sixth embodiment of the first invention. Yes, and are Figures 10 to 15 an embodiment of the second invention? 10.11 is the first embodiment of the second invention, FIG. 10 is a plan view of the composite tool,
Fig. 11 is a side view thereof, Fig. 12 is a side view of a compound tool according to a second embodiment of the second invention, Figs. 13 and 14 are a third embodiment of the second invention, and Fig. 13 is a composite tool. Top view of the tool, No. 14
The figure is a side view thereof, and FIG. 15 is a side view of the fourth embodiment of the second invention. 1... Base metal, 2... Cutting edge portion, 6... Side relief allowance,
7... Step, 1a... Side Patent applicant Honda Motor Co., Ltd. Figure 1 Figure 3 Figure 4 Figure 6 Figure 13 Figure 14 Figure 15 Figure 10 Figure 12

Claims (2)

[Claims] (1) For cutting, consisting of a polygonal base metal made of cemented carbide, etc., and a cutting edge made of a high-hardness sintered body such as a diamond sintered body bonded to the corner of this base metal. The compound tool is characterized in that a side clearance equal to or larger than the grinding allowance of the cutting edge is formed via a step on both sides of the base metal behind both sides of the cutting edge. Composite tool for cutting. (2) For cutting, consisting of a polygonal base metal made of cemented carbide, etc., and a cutting edge made of a high-hardness sintered body such as a diamond sintered body bonded to the corner of this base metal. A compound tool for cutting, characterized in that a side clearance equivalent to a limit grinding allowance when re-grinding the cutting edge is formed on both sides of the base metal behind both sides of the cutting edge. Composite tool.