JPH0426161Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a throw-away tip suitable for use as a cutting blade for a parting tool or the like.

[Prior Art] Fig. 5 to Fig. 8 show the above-mentioned conventional throw-away tip (hereinafter abbreviated as tip) for a cut-off tool.

This chip 1 is a plate-like one made of cemented carbide, cermet, etc., with a pair of side surfaces 2, 2 narrowly formed, and its upper and lower surfaces 3, 4 are in a direction perpendicular to the side surfaces 2, 2, respectively. It is formed in a concave V-shape with a slightly concave central portion toward the center. In addition, the upper surface 3
A cutting edge 5 and a rake face 6 along the cutting edge 5 are formed at one end in the direction along the side surface 2 . The upper surface 3 is formed by an inclined surface that is inclined toward the lower surface 4 from the end on the cutting edge 5 side toward the other end, and forms a wedge shape together with the lower surface 4.

As shown in FIG. 9, the conventional chip 1 having the above structure is pushed into a mounting hole 8 formed at the distal end of the holder 7 and gradually becoming wider from the proximal end toward the distal opening. The mounting surfaces 9 and 10 of this mounting hole 8 are provided with wedge-shaped upper and lower surfaces 3 and 10, respectively.
4 is brought into contact with the holder 7, and the cutting blade 5 cuts the outer circumferential surface of a rotating workpiece (not shown) in the radial direction to cut it in the radial direction.

Here, the mounting surfaces 9 and 10 of the holder 7 are each formed into a convex V-shape that engages with the concave V-shape of the upper and lower surfaces 3 and 4 of the chip 1 in the width direction.
That is, the chip 1 has its concave V-shaped upper and lower surfaces 3 and 4 engaged with the convex V-shaped mounting surfaces 9 and 10 of the corresponding holder 7, respectively.
It is mounted on the holder 7 while being prevented from moving in the direction along the cutting edge 5. Also, this chip 1 is
During cutting, the holder 7 is pressed toward the proximal end side of the holder 7 by the component force of the cutting edge 5 generated by cutting, and the holder 7 is pressed against the base end side by the wedge effect formed by the upper and lower surfaces 3 and 4. It is firmly fixed between the mounting surfaces 9 and 10 of.

Therefore, such a chip 1 has the advantage that it is easy to mount and does not require a complicated fixture on the holder 7 side.

[Problems to be solved by the invention] However, in the case of the above conventional chip 1,
Once this is inserted into the mounting hole 8 of the holder 7 and before cutting starts, if something touches the holder 7 or the holder 7 vibrates,
There was also the problem that the chip 1 would fall off from the holder 7 because the wedge effect created by the upper and lower surfaces 3 and 4 for fixing the chip 1 had not yet occurred.

In addition, in the case of this chip 15, in order to obtain a sufficient wedge effect between the upper and lower surfaces 3, 4 during cutting, the upper and lower surfaces 3, 4 and the mounting surfaces 9, 10 should be brought into contact over substantially the entire surface. Therefore, the upper and lower surfaces 3, 4 and the mounting surface 9 of the holder 7,
There was also the problem that dimensions such as 10 had to be finished with high precision.

[Purpose of the invention] This invention was made in view of the above circumstances.
The object of the present invention is to provide a chip that can be easily and reliably attached to a holder.

[Means for Solving the Problems] The chip of this invention has its upper and lower surfaces formed in a V-shape that can engage with the cross section of the mounting surface of the mounting hole, and at least one of the upper and lower surfaces. A thin anti-slip layer made of a material softer than that of the holder is formed on the surface of the holder.

[Example] Figures 1 to 4 show an example of a chip of this invention, and parts common to those shown in Figures 5 to 8 are given the same reference numerals and their explanations will be explained. Omitted.

1 to 4, this chip 20 has anti-slip layers 21 and 22 formed on its upper and lower surfaces 3 and 4, respectively.

These anti-slip layers 21 and 22 are provided on the holder 7.
It is a thin layer formed from a material softer than the above-mentioned upper and lower surfaces 3 and 4, and more specifically, thin synthetic resin or Japanese paper is pasted on the upper and lower surfaces 3 and 4, or an adhesive or the like is applied to the upper and lower surfaces 3 and 4. It is formed by metal plating using metal such as lead.

In the chip 20 having such a structure, anti-slip layers 21 and 22 made of a material softer than the holder are formed on the upper and lower surfaces 3 and 4 of the chip 20. By simply pushing the chip 20 inward, the wedge effect brings the anti-slip layers 21, 22 into close contact with the mounting surface of the holder, thereby significantly increasing the frictional force between the chip 20 and the mounting surface of the holder. Further, the cross sections of the upper and lower surfaces 3, 4 are formed in a concave V shape that engages with the convex V-shaped cross sections of the mounting surfaces 9, 10, and a wedge effect is created between these cross sections. Anti-slip layer 2
1 and 22 improves the adhesion between the upper and lower surfaces 3 and 4 and the mounting surfaces 9 and 10, increasing the adhesion area on both sides, which works together with the wedge effect between the chip 20 and the mounting hole of the holder. Therefore, stronger frictional force can be obtained. That is, the frictional force that holds the chip 20 is applied to the mounting surfaces 9 and 9 due to the wedge effect.
10 is determined by the product of the pressing force that presses the upper and lower surfaces 3 and 4, the coefficient of friction between both surfaces, and the contact area of both surfaces. According to the chip 20 having the above configuration, the contact area is increased. You can also
The above pressing force can also be increased due to the wedge effect,
Furthermore, since the anti-slip layers 21 and 22 increase the coefficient of friction, it becomes possible to increase the frictional force exponentially and hold the chip 20 extremely firmly. Therefore, even if something touches the holder or the holder vibrates before cutting starts, there is no fear that the chip 20 will fall off. Moreover, since the chip 20 can be reliably brought into close contact with the mounting surface of the holder through these anti-slip layers 21 and 22, there is no need to finish the dimensions of the mounting surface of the holder with high precision, and therefore the holder, etc. It is also possible to reduce the manufacturing cost.

In the above embodiment, the anti-slip layers 21 and 22 were formed on both the upper and lower surfaces 3 and 4 of the chip 20, but the anti-slip layers 21 and 22 were formed on both the upper and lower surfaces 3 and 4 of the chip 20, but the anti-slip layer was formed only on one of the upper and lower surfaces 3 and 4. Stop layer 21, 2
2 may be formed.

[Effects of the invention] As explained above, the chip of this invention has its upper and lower surfaces formed in a V-shape that can engage with the cross section of the mounting surface of the mounting hole, and at least one of the upper and lower surfaces. Since a thin anti-slip layer made of a material softer than the holder is formed on the surface of the holder, a synergistic effect between the wedge effect created between the upper and lower surfaces and the mounting surface and the increase in the coefficient of friction due to the anti-slip layer is achieved. This allows the frictional force between the chip and the holder to be significantly increased. Therefore, even if the holder vibrates during the initial stage of mounting, there is no fear that the chip will fall off from the holder, and therefore the holder can be mounted even more easily and reliably. Further, since the anti-slip layer allows the upper and lower surfaces of the chip to be brought into close contact with the mounting surface of the holder, there is no need to finish the mounting surface of the holder with high precision as in the conventional case.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the chip of this invention. Figure 1 is a front view, Figure 2 is a side view, Figure 3 is a top view, Figure 4 is a bottom view, and Figure 4 is a bottom view. Figure 5~
Figure 8 shows a conventional chip; Figure 5 is a front view, Figure 6 is a side view, Figure 7 is a top view, Figure 8 is a bottom view, and Figure 9 shows this type of chip installed. FIG. 2 is a schematic diagram showing a holder for a cutting tool. 20... Chip (throwaway chip), 2
...Top surface, 3...Bottom surface, 5...Cutting blade, 7...Holder, 9, 10...Mounting surface, 8...Mounting hole, 21,
22...Anti-slip layer.

Claims (1)

[Scope of utility model registration request] A wedge-shaped upper and lower surface is attached to the mounting surface, which has a V-shaped cross section, of the mounting hole that is formed at the distal end of the holder and gradually becomes wider from the proximal end side to the distal opening side of the holder. In the throw-away chip, which is detachably attached by bringing the two surfaces into contact with each other, the cross section of the upper and lower surfaces is formed into a V-shape that can engage with the cross section of the mounting surface, and at least one of the upper and lower surfaces A throw-away chip characterized in that a thin anti-slip layer made of a material softer than the holder is formed on the surface thereof.