JPH0520806U - Chip fixing structure for bite holder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tip fixing structure for a bite holder, in which the tip can be easily attached to and detached from the holder body, and the tip is not loosened during the work, and the stability is high. [Structure] The holder body 1 has a structure in which the tip 3 is detachably fixed to the tip seat 2 formed at the tip of the holder body, and the head is attached to the base.
7 has a pressing surface 8 formed by surrounding a concave groove at the tip, and a fixing pin 6 that is inserted from the hole 4 penetrating the chip 3 into the pin insertion hole 9 provided in the holder body 1, Pin insertion hole 9
Screw hole that is inclined from the top of the holder body toward
Presser screw 1 that is screwed into 0 and has its tip facing the pressing surface 1
The tip fixing structure of the bite holder is characterized by including 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chip fixing structure that is detachably fixed to the tip of a holder body.

[0002]

[Prior Art]

 As a bite holder used for general turning, a chip seat formed at the tip of the holder body is made of ceramic (ultra high pressure sintered body) and has a polygonal shape (for example, triangular or quadrangular) in plan view. The throwaway type bite holder is widely used, which is detachably fixed, and the setting position of the tip with respect to the holder body is changed to sequentially use the cutting edges formed at each corner of the tip.

In this type of bite holder, there are a clamp-on method, a lever method, a bolt method and the like for fixing the tip to the holder body. However, both the clamp-on method and the lever method are structurally complicated. It is expensive due to the large number of parts. On the other hand, the bolt type adopts a structure in which a fixing bolt is inserted into a hole penetrating the chip and is screwed directly to the holder body. It can be said that the drawbacks of the clamp-on method and the lever method have been eliminated.

[0004]

[Problems to be solved by the device]

 However, in the bolt type, since the insert is directly fixed to the holder body by tightening the fixing bolt, in order to maintain a secure chip fixing relationship so as not to loosen the insert during turning, the fixing bolt It is required to lengthen the screwing length between the holder and the holder body to some extent to stabilize the tightening force.

Therefore, the structure is simple, but it is troublesome to attach and detach the fixing bolt when the tip is removed to change the setting position with respect to the holder body or when the worn tip is replaced. There is.

The present invention has been made in view of the above points, and an object of the present invention is to provide a tip fixing structure for a bite holder that allows easy attachment / detachment of the tip and improves workability.

[0007]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above-mentioned object is a structure in which a tip is detachably fixed to a tip seat formed at the front end of a holder body, and a head is provided at the base and a recess is provided at the tip. It has a pressing surface that is formed by surrounding a groove, and a fixing pin that is inserted into a pin insertion hole that is provided in the holder body from a hole that penetrates the tip, and an inclination from the top surface of the holder body toward the pin insertion hole The tip fixing structure of the bite holder is characterized in that it is provided with a cap screw screwed into a screw hole provided so that its tip faces the pressing surface.

[0008]

[Action]

 The tip is fixed by screwing the cap screw and pulling the fixing pin into the pin insertion hole, and the tip fixing relationship is maintained securely unless the cap screw is loosened.

When removing the chip, the fixing pin can be pulled out by loosening the cap screw and retracting the tip of the chip from the pin insertion hole.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an essential part of the present invention, and FIG. 2 is a vertical sectional view taken along the line AA of FIG.

In the figure, 1 is a holder main body having a tip seat 2 formed on the upper surface of the tip. Reference numeral 3 is a tip fixed to the tip seat 2, which is a well-known cemented carbide throwaway tip having holes 4 and cutting edges 5 formed at each corner. 6 is a fixing pin for fixing the tip 3, which has a head 7 at the base end and a pressing groove 8 at the tip to form a pressing surface 8, which is inserted into the hole 4 of the chip 3 to insert the head. 7 The thickness of the bottom surface is such that it engages with the taper formed in the upper part of the hole and there is almost no gap between it and the hole 4 so that it can be freely inserted and removed. Reference numeral 9 denotes a pin insertion hole which is provided in the holder body 1 in the chip seat 2 and into which the fixing pin 6 is inserted, and has a diameter which forms a slight gap with the fixing pin 6. The pin insertion hole 9 of the embodiment penetrates from the tip seat 2 to the lower end surface of the holder body. 10 is a screw hole that is provided by inclining forward and downward from the upper surface of the holder body toward the middle of the pin insertion hole 9, and 11 is a cap screw screwed into this screw hole 10, and the tip 12 of this cap screw 11 is pinned. It faces the pressing surface 8 of the fixing pin 6 in the insertion hole 9.

Reference numeral 13 in the drawing denotes a shim sheet interposed between the tip seat 2 and the tip seat 3, which is handled together with the tip seat 3 and protects the tip seat seat 2 and works when the tip 3 is damaged. The purpose of this is to prevent the holder body 1 from being damaged by the uncut portion that occurs in the.

In the above structure, when the cap screw 11 is screwed in the tightening direction, the tip 12 of the cap screw projects into the pin insertion hole 9 and abuts against the pressing surface 8 of the fixing pin 6 to fix the fixing pin 6 in the pin insertion hole 9. And insert the tip 3 together with the shim sheet 13 into the tip seat 2. At the same time, the pressing point of the cap screw tip 12 against the pressing surface 8 is on the rear side of the fixing pin 6 as viewed from the holder body 1, so the tip of the fixing pin 6 faces sideways forward in the gap with the pin insertion hole 9. The fixing pin 6 tends to incline due to the pressing force of, and the tip 3 of the base of the fixing pin 6 is pushed toward the side wall of the tip seat to stabilize the tip 3.

Further, since the holding screw 11 is always used in a screwed state with respect to the screw hole 10, a sufficient screwing length with the screw hole 10 can be adopted, and loosening occurs during turning. Even if it is tightened firmly, the screw part will not be overloaded and the captive screw 11 will not be damaged.

FIG. 3 is a front view of a fixing pin showing another embodiment of the present invention.

The fixed pin 6 of this embodiment has a large-diameter portion 14 bulged around the upper portion of the fixed pin 6 in a portion inserted into the pin insertion hole 9.

This large-diameter portion 14 is used as an inclination fulcrum of the fixing pin 6 in the pin insertion hole 9 by being crimped to the wall of the pin insertion hole 9 by screwing in the holding screw 11, so that the tip 3 is stronger. This is for pressing the tip seat side wall side.

Instead of the large-diameter portion 14 provided around the fixing pin 6 described above, the pin insertion hole 9 may be machined and a wall portion thereof may be provided with a portion serving as a tilt fulcrum of the fixing pin 6.

[0020]

【effect】

 As described above, the present invention has the following effects.

(1) When changing the position of the tip or attaching or detaching the tip for replacement, it is only necessary to move the holding screw, which is always screwed into the screw hole, back and forth within a predetermined range, so the work is easy. Improve sex.

(2) Since there are only two members for fixing the chip, the cap screw that is screwed into the screw hole and the fixing pin that is detached from the holder body together with the chip, the structure is simple and the cost is low. it can.

(3) Since the screwing length of the cap screw with respect to the screw hole can be sufficiently set, stability is high and there is no possibility of tightening strongly and damaging the cap screw.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a fixing pin showing another embodiment of the present invention.

[Explanation of symbols] 1 ... Holder body 2 ... Tip seat 3 ... Tip 4 ... Hole 5 ... Cutting edge 6 ... Fixing pin 7 ... Head 8 ... Pressing surface 9 ... Pin insertion hole 10 ... Screw hole 11 ... Press screw 12 ... Screw tip 13 ... Shim sheet 14 ... Large diameter part

Claims (1)

[Scope of utility model registration request] 1. A structure in which a chip is detachably fixed to a chip seat formed at the tip of a holder main body, and has a head portion at a base portion and a pressing surface formed by surrounding a concave groove at the tip portion. , The fixing pin inserted into the pin insertion hole provided in the holder main body from the hole penetrating the chip, and the screw hole inclined from the upper surface of the holder main body toward the pin insertion hole, and the tip is pressed against the pressing surface. The tip fixing structure of the bite holder, which is equipped with a cap screw facing the.