JPH0435043Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clamp fitting for securely attaching a throw-away chip to a holder.

(Prior technology) As a chip holding plate, a chip breaker made of super hard alloy is fixed to the tip of the chip holding plate.
The one disclosed in No. 3986 is known.

(Problem to be solved by the invention) When clamping a small chip with a clamping fitting whose tip is made of a superhard alloy, the tip may be damaged.

(Means for Solving the Problems) In order to solve the above problems, the present invention fixes a thin plate-like piece of super-hard alloy to the tip of the clamp fitting, and forms a clamping surface on the lower surface of the tip of the clamp fitting. However, due to the difference in level between this clamping surface and the lower surface of the tip of the cemented carbide piece, a relief portion was provided between the cemented carbide piece and the chip during clamping.

(Function) The thin cemented carbide alloy pieces prevent chips from coming into contact with the members of the clamp fitting body during high-speed cutting. Furthermore, due to the relief part, the tightening force during clamping is not applied to the cemented carbide piece.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figure 1 is a plan view of the clamp fitting of the present invention;
The figure is a side view thereof. A thin plate-like piece of super-hard alloy 2 is fixed to the tip of the clamp fitting 1 by low-temperature brazing. Further, a clamp surface 3 is provided on the lower surface of the tip of the clamp fitting 1, and this clamp surface 3
A relief portion 5 is formed by a step between the tip end surface 4 of the cemented carbide piece 2 and the lower surface 4 of the tip. And clamp fitting 1
A screw hole 6 is formed in the upper surface of the central portion of the clamp fitting 1 and extends vertically through the lower surface thereof, and a substantially cylindrical flange portion 7 is formed in the lower surface of the central portion of the clamp fitting 1.

The operation of the clamp fitting constructed as above will be explained below.

As shown in FIGS. 3 and 4, the chip 10 is placed in a predetermined position on the cartridge type holder 11, and the clamp surface 3 of the clamp fitting 1 is brought into contact with the chip, and the flange portion 7 is placed on the holder. After engaging with the groove 11, the tightening bolt 12 is screwed into the screw hole 6 and screwed into the female threaded portion of the holder 11. By tightening the tightening bolt 12, the clamp surface 3 strongly presses the chip 10, and the chip 10 is firmly fixed. At this time, since the relief portion 5 is formed, the cemented carbide piece 2 does not come into contact with the chip 10, so no tightening force is applied to the cemented carbide piece 2. Next, the holder 11 to which the chip 10 is fixed is attached to the finish machining tool attachment part 14 by the attachment bolt 13, and finish machining of the cylinder bore of the cast iron cylinder block is performed. Although chips come into contact with the front surface of the clamp fitting during high-speed cutting, since the cemented carbide piece 2 is fixed, the clamp fitting 1 will not be damaged.

The reason why the ultra-hard alloy piece 2 is made into a thin plate is that it is sufficient to prevent wear caused by chips and does not need to function as a chip breaker.

(Effects of the invention) As explained above, according to the invention, a thin plate-shaped piece of super-hard alloy is fixed to the front surface of the clamp fitting, so even if chips come into contact with it during high-speed cutting, problems due to wear at the tip of the clamp fitting can be prevented. Furthermore, since the relief portion is provided, the tightening force during clamping is not applied to the super-hard alloy pieces, so damage to the super-hard alloy pieces can be prevented. Therefore, it is possible to provide a compact and wear-resistant clamping fitting that can securely clamp a small chip.

[Brief explanation of the drawing]

Figure 1 is a plan view of the clamp fitting of the present invention, Figure 2
These figures are a side view, FIG. 3 is a plan view showing the chip fixed to the holder with a clamp fitting, and FIG. 4 is a side view. In the drawings, 1 is a clamp fitting, 2 is a piece of super hard alloy, 3 is a clamping surface, 5 is a relief part, and 10 is a chip.

Claims (1)

[Scope of utility model registration request] In a clamp fitting for pressing and fixing a bite chip to a holder, a thin plate-shaped piece of super hard alloy is fixed to the tip of the clamp fitting, and a clamping surface is formed on the lower surface of the tip of the clamping fitting, and this clamping surface and the super hard alloy are fixed to the tip of the clamping fitting. A clamp fitting characterized in that a relief portion is formed between the tip and the tip by a step between the tip and the lower surface of the hard metal piece.