JPH0131362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a chip in which the cutting edge portion is made of an ultra-high pressure sintered body of cubic boron nitride, diamond, or the like.

[Prior Art] Recently, ultra-high pressure sintered bodies as described above have come to be used as cutting tool materials. A cutting blade structure made of an ultra-high pressure sintered body of approximately the same size as the pedestal is integrally provided on the top surface of a cemented carbide pedestal by sintering, and the bottom surface of the pedestal is attached to a tool body such as a cutting tool shank. One example of this is a chip that is brazed to a metal.

By the way, when sintering the cutting blade structure made of an ultra-high pressure sintered body and the cemented carbide pedestal, an ultra-high pressure sintering device is used, and the uniformity of the bonded parts due to the sintering is very high. In order to obtain sufficient joint strength, the cutting blade structure made of an ultra-high pressure sintered body and the cemented carbide pedestal have both had flat top and bottom surfaces (for example,
52-43846). Therefore, this type of chip itself, which utilizes an ultra-high pressure sintered body, usually does not have anything equivalent to a chip breaker. Therefore, conventionally, as a means for providing a chip breaker member, a method has been considered in which a chip breaker groove is directly ground into the rake face of a cutting blade structure made of an ultra-high pressure sintered body.

[Problems to be solved by the invention] However, in such a method, the grindability of the ultra-high pressure sintered body is very poor, making grinding difficult and requiring a lot of time. It is difficult to avoid problems such as damage to the cutting edge or the possibility of chipping of the cutting edge. For this reason, it is not possible to provide a chip breaker member, and the use of this type of chip has been limited to turning or finishing of light alloys and the like.

This idea was made in consideration of the above points, and by brazing a chip breaker member to the rake face of the cutting blade structure made of the ultra-high pressure sintered body, it expands the uses of this type of chip. With,
To provide a chip that allows easy positioning of a chip breaker member.

[Means and effects for solving the problems] This invention is to fix a chip breaker member to the rake face of a cutting blade structure made of an ultra-high pressure sintered body. This fixing means is achieved by applying metal plating to the rake face of the cutting blade structure and brazing the chip breaker member thereon. Here, the rake face is metal-plated in consideration of the poor wettability of the ultra-high-pressure sintered body to the brazing metal, and the material for the metal plating is nickel, chromium, etc. It is preferable to use silver solder as the material. By doing so, the chip breaker member can be firmly and permanently adhesively fixed to the rake surface of the cutting blade structure.

In addition, as a means for positioning the chip breaker member, by forming a mounting seat on the tool body,
Can be installed with high precision.

[Embodiment] FIGS. 1 to 3 show a first embodiment of this invention, and reference numeral 1 indicates a byte shank. A tip 2 according to this invention is fixed to a tip seat 1a at the tip of a bite shank 1 by brazing. The chip 2 includes a pedestal 3 made of cemented carbide, a cutting blade structure 4 made of an ultra-high pressure sintered body integrally sintered on the pedestal 3, and a metal plate on the rake surface 4a of the cutting blade structure 4. It consists of a chip breaker member 5 which is plated and fixed onto the metal plating by brazing. This chip breaker member 5 is
A part of one side 5a of the side wall 1al of the chip seat 1a is
is in contact with.

As a result, the side wall 1al of the chip seat 1a is not only used as a mounting reference surface for the cutting blade structure 4, but also as a mounting seat as a mounting reference surface for the chip breaker member 5. Not only is it highly accurate and easy to perform,
Even if chips collide with the inclined surface 5b of the chip breaker member 5 during cutting, the chips will not be misaligned, and the chips can always be divided into appropriate sizes.
It is possible to improve the discharge of chips. Further, it is not necessary to heat the positioning member of the chip breaker member 5, which is not only advantageous in terms of cost, but also has sufficient strength and excellent durability.

Note that when brazing the chip breaker member 5 through the metal plating layer, it should be done at the same time as brazing the cemented carbide base 3 with the integrated cutting blade structure 4 to the bite shank 1. It is better to do so.

4 to 6 show a second embodiment of this invention. This second embodiment is basically similar to the first embodiment, but the bite shank 1
The depth of the tip seat 1a at the tip is equal to the height of the cutting blade structure 4 and the pedestal 3, and the tip seat 1a
This embodiment differs from the first embodiment in that a new mounting seat 6 that fits the chip breaker member 5 is provided in the vicinity of the chip breaker member 5. In this embodiment as well, by abutting one side 5a of the chip breaker member 5 against the side wall 6a of the mounting seat 6, positioning can be performed easily and with high precision. Bonding strength can also be obtained.

[Effects of the invention] The chip of this invention has metal plating on the rake face of the cutting blade structure made of an ultra-high pressure sintered body, and a chip breaker member is adhesively fixed thereon by brazing. One side of the member is brought into contact with a side wall of a mounting seat formed on the upper main body. Therefore, problems such as difficulty in grinding and notches in the cutting edge portion, which occur when the cutting blade structure itself is ground, are not caused, and the uses of the chip can be expanded. Further, the chip breaker member can be positioned with high precision, and chips can always be discharged in a good condition without positional deviation even during cutting. Furthermore, since no additional positioning member is required, there are various effects such as being advantageous in terms of cost, having sufficient strength and excellent durability.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment of this invention; Figure 1 is an overall view of the chip, Figure 2 is a plan view thereof, Figure 3 is a left side view of the chip, and Figure 4 is a diagram of the chip. 6 show a second embodiment of this invention, FIG. 4 is an overall view of the chip, FIG. 5 is a plan view thereof, and FIG. 6 is a left side view thereof. 1...Bite shank (tool body), 1a...
Chip seat (mounting seat), 1al... side wall, 3... cemented carbide base, 4... cutting blade structure, 5... chip breaker, 5a... one side, 6... mounting surface, 6a
...side wall.

Claims (1)

[Scope of utility model registration request] A cutting blade structure made of an ultra-high pressure sintered body of approximately the same size as the pedestal is integrally provided on the top surface of a cemented carbide pedestal by sintering, and the bottom surface of the pedestal is brazed to the tool body. In the chip used as a chip, the rake face of the cutting blade structure made of the ultra-high pressure sintered body is metal plated, and the chip breaker member is bonded and fixed thereon by brazing. A chip characterized in that one side is in contact with a side wall of a mounting seat formed on a tool body.