JPH0118246Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention uses ultra-high-pressure sintering containing diamond, cubic boron nitride, etc. as the main ingredients at the corners of the upper surface of the substrate, which has a polygonal shape in plan view. This invention relates to a throw-away chip with an ultra-high pressure sintered body provided with a body.

[Conventional technology]

Conventional throw-away tips of this type include those shown in FIGS. 9 and 10. This throw-away chip 1 has a corner chip 12 in which an ultra-high pressure sintered body 14 is integrally sintered on a cemented carbide base material 13 on an arbitrary corner of the upper surface of a square-shaped cemented carbide substrate 11. It is fixed by brazing. In addition, the code|symbol 15 in the figure is a wax layer. Further, the throwaway tip 2 shown in FIGS. 11 and 12 has an equilateral triangular shape, and has the same structure as the throwaway tip 1 in other respects.

By the way, the above throwaway tips 1 and 2
Since the corner chips 12, 22 are provided only in one corner, the corner chips 12, 22 are provided only in one corner.
There is a problem in that once the 22 is worn out, it must be disposed of immediately. Therefore, it is desirable from the viewpoint of use and tool safety to provide corner chips 12 and 22 at other corners as shown by the two-dot chain lines in FIGS. 9 and 11, respectively.

[Problem that the invention attempts to solve]

However, the corner chips 12, 2 on the full-width part
2, when the throw-away tip 1 is attached to the tool body A, as shown in FIG. A problem arises in that the ultra-high-pressure sintered body 14 at this contact portion is chipped (minor chipping) due to the rubbing action with the tool body A caused by vibration during cutting. For this reason, in the conventional throw-away chip with an ultra-high pressure sintered body, it has not been possible to provide the ultra-high pressure sintered body on all corners of the substrate.

In other words, this idea aims to solve the problem that when ultra-high pressure sintered bodies are provided at all corners of the board, the ultra-high pressure sintered bodies are chipped due to the friction with the tool body caused by vibration during cutting. purpose.

[Means for solving problems]

In order to solve the above-mentioned problem, this device forms the corner part so that the side surface of the chip, including the side surface of the ultra-high pressure sintered body, is located inside the chip from the extended surface of the central part of the side surface of the chip. It is something.

[Effect]

In this way, if the side surface of the chip including the side surface of the ultra-high pressure sintered body at the corner is located inside the chip from the extended surface of the central part of the side surface of the chip, when the throw-away chip is attached to the tool body, Only the central part of the side surface of the chip comes into contact with the tool body, and the ultra-high pressure sintered body does not come into contact with the tool body. Therefore, chipping (microchipping) of the ultra-high pressure sintered body due to the abrasion action of the tool body can be prevented.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

As shown in FIGS. 1 to 3, the throw-away chip 3 of this embodiment includes a substrate 31 made of cemented carbide having a square shape in plan view, and each corner of the upper surface of this substrate 31. The corner chips 32 are respectively fixed by brazing, and the corner chips 32 have a structure in which an ultra-high pressure sintered body 34 is integrally sintered on a base material 33 made of cemented carbide. The corner side end of the tip side surface 36 of this throwaway tip 3, that is, the corner tip 32
The end portion including the side surface is bent toward the inside of the chip 3 with respect to the center of the chip side surface 36. As a result, the end portion of the chip side surface 36 including the side surface of the corner chip 32 is aligned with the tip side surface 36.
It is located inside the chip from the virtual extension surface of the central part of the chip.

However, the throwaway tip 3 with the above configuration
As shown in FIG. 4, when attached to the cutting tool body (tool body) A, the end of the tip side surface 36 is located inside the tip rather than the center, so the tip side surface 36 is Only the center portion contacts the tool body A, and the end portions of the tip side surfaces 36 do not contact the tool body A. Therefore, the ultra-high-pressure sintered body 34 is not scratched by the cutting tool body A, and the occurrence of chipping (microchipping) due to vibration during cutting is prevented.

Next, another embodiment of this invention will be described. It goes without saying that the effects of this invention can also be obtained in the following embodiments.

The throwaway tip 4 shown in FIGS. 5 and 6 has a substantially equilateral triangular shape in plan view.

Further, the throwaway chip 5 shown in FIGS. 7 and 8 has an ultra-high pressure sintered body 5 on the chip side surface 56.
The corner side end portion including the side surface of the chip 4 is formed to have a step with respect to the center thereof, so that it is positioned inside the chip 5.

Although the above embodiments are all negative chips, this invention may also be applied to positive chips. Of course, similar effects can be obtained in that case as well.

[Effect of idea]

As explained above, according to the throwaway chip with an ultra-high pressure sintered body of this invention, the corner portion can be
Since the chip side surface including the side surface of the ultra-high pressure sintered body is located inside the chip from the central extension of this chip side surface, the ultra-high pressure sintered body is provided at all corners of the board. Even so, it is possible to prevent the ultra-high-pressure sintered body from chipping due to the abrasion action against the tool body due to vibration during cutting.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of this invention, with Figure 1 being a diagram showing the main parts thereof, Figure 2 being an enlarged view of the working circle part, Figure 2 being a plan view thereof, Fig. 3 is a side view thereof, Fig. 4 is a view showing the throw-away tip according to this invention attached to a cutting tool body (tool main body), and Figs. 5 and 6 show other embodiments of this invention. Fig. 5 is the plan view, Fig. 6 is the plan view.
7 and 8 show still other embodiments of the invention, FIG. 7 is a plan view, FIG. 8 is a side view, and FIGS. 9 and 10 are conventional Fig. 9 is a plan view thereof, Fig. 10 is a side view thereof, and Fig. 10 is a side view thereof.
1 and 12 show other examples of conventional throw-away chips, and FIG. 11 is a plan view thereof, and FIG.
FIG. 2 is a side view thereof, and FIG. 13 is a diagram showing a state in which a conventional throw-away tip is attached to a cutting tool body. 3, 4, 5... Throwaway tip, 31...
...Substrate, 34,54...Ultra high pressure sintered body, 36,5
6... Chip side.

Claims (1)

[Scope of utility model registration request] In a throwaway chip with an ultra-high-pressure sintered body, in which an ultra-high-pressure sintered body is provided at a corner of the upper surface of a substrate having a polygonal shape in plan view, the corner portion of the chip is 1. A throwaway chip with an ultra-high pressure sintered body, characterized in that a side surface of the chip including the side surface is located inside the chip from an extended surface of the central part of the side surface of the chip.