JPS6031850Y2 - slow-away bite - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an indexable cutting tool in which an indexable tip is pressed against one end of a holder using a presser foot.

In recent years, the development of cutting tools in the machining field has been active.In order to increase the efficiency of cutting work, it is important to extend the life of the tool itself, but it is also necessary to change tools quickly and reliably, so indexable inserts are being developed. Various ideas have been made for mechanically clamped indexable tools.

It is necessary to fix the chip firmly and accurately, but in the case of sushi, it takes time to remove the chip because it is in close contact with the chip seat and wall of the holder. The problem is that it is hot and can cause burns if you pinch it with your fingers.

Recently, so-called automatic tip exchange tools that can automatically exchange tips have begun to be used in automatic lathes, NC copying lathes, etc., and the present invention is also effective in unmanned operation.

(Japanese Patent Application No. 53-16556, Patent Application No. 55-00226) A conventional method for the same purpose as the present invention is as in Japanese Utility Model Application No. 51-119675, in which the angle that widens toward the bottom of the chip is There is a method in which a push rod with a conical head that can slide up and down is attached below a tip with a hole, and is pushed up with a spring to separate the tip. There is a drawback that it is difficult to accurately set the position of the cutting edge due to variations in the plane and angle with respect to the hole taper.

In contrast, the present invention provides a throw-away cutting tool that has a tip fixing/detaching device that allows the hole shape of the tip to be arbitrary, and allows for easy attachment/detachment and accurate setting of the cutting edge.

Examples will be described below based on the drawings.

Fig. 1 is a plan view with the right side cut away of the holder 2 of the throw-away tool according to an embodiment of this invention, and Fig. 2 is a plan view of the A of Fig. 1.
-A cross-sectional front view, Figure 3 is a diagram showing the bottom plate 6 of the throwaway tip 1, where A is a plan view, the mouth is a front view, and C is B of A.
-B is a cross-sectional front view.

As shown in Fig. 1, the throw-away tool of the present invention has an indexable tip 1 attached to a seat control portion at one end of a holder 2 made of steel or the like.
is attached, and the presser foot 3 is screwed into the holder by passing the presser foot through a screw hole penetrating the holder.By tightening the screw 4, the tip 1 is attached to the bottom plate 6 by the presser surface 10 of the presser foot 3.
Pressed by

As shown in FIG. 3, the bottom plate 6 has a screw hole 9a located a little apart from the center, and a notch 11 at one end.

This bottom plate 6 is fixed to the end of the holder with bolts 9 as shown in FIG.

An L-shaped elastic body made of, for example, piano wire (high carbon steel) is inserted into the notch 11 of the bottom plate, and one end of this L-shaped elastic body is set into a hole provided in the holder from the bottom. When the chip 1 is not inserted, it is pushed up toward the upper left in FIG. 2.

When a chip with a hole in the center is inserted into this and pressed with the presser foot 3 as described above, the end 8 of the L-shaped elastic body 5 is pressed by the chip, and the other end of the elastic body moves the chip into the seat of the holder. By pressing it against the wall, the tip will come into close contact with the wall and the cutting edge will be accurately fixed.

When the presser foot is removed by loosening the screw 4, one end 8 of the L-shaped elastic body is pushed up by the pushing up of the spring 7, and the chip floats slightly, making it easier to remove the chip.

With this structure, it is extremely easy to change the tip by hand, and there is no chance of getting burned, and even when used in an automatic exchange tool, the mechanical tip can be changed reliably.

According to this invention, there is no need for the hole in the chip to be tapered, and it is sufficient that one end of the L-shaped elastic body can protrude.
It is of high practical value because variations in precision of each component do not affect the precision of fixing the chip.

The L-shaped elastic body used in this invention does not have to have the shape shown in Figure 2, but is an integral body, one end of which is pushed down when the chip is fixed, and the other end that presses the inner surface of the chip hole against the seat control surface. That's fine.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a part of the right notch of a throw-away tool according to an embodiment of this invention, Fig. 2 is a cross-sectional front view taken along the line A--A in Fig. Fig. 1 shows the shape, and A is a plan view, the mouth is a front view, and C is a cross-sectional front view taken along the line B-B of A. A brief explanation of the drawings, 1 is a tip, 2 is a holder, 3 is a presser foot, 4 is a clamp screw, 5 is an L-shaped elastic body, 6 is a bottom plate,
7 is a spring, 8 is one end of the bottom plate, 9 is a bolt, 10
11 is the tip pressing surface of the presser foot, 11 is the notch in the bottom plate 6, and 12 is the tip pressing surface of the presser foot.
is a hole through which the protrusion of the L-shaped elastic body passes.

Claims (1)

[Scope of utility model registration request] In a fixing device for a throw-away tool, the clamp screw attached to the presser foot presses and fixes the tip from the top surface of the tip onto the bottom plate using the presser foot. An L-shaped elastic body is inserted so that the other end of the presser foot presses against the bottom of the tip, and when the presser foot is loosened, a spring attached to the bottom of the elastic body presses the L-shaped elastic body. This throw-away tool is characterized in that it lifts the inserted tip and also releases the tip from being pressed against the seat wall surface.