JPH03262Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a clamp chuck for an electrically heated header.

[Conventional technology and its problems]

As shown in Fig. 2, a pair of clamp chucks A and A hold a shaft member W, and the tip of the shaft member W is pressurized by an upsetter B that can be moved toward clamp chuck A, and at the same time, electricity is applied. to heat the shaft material W,
In a header (heading machine) that crushes the tip of the shaft material W by applying pressure and heating to perform head manufacturing as shown in Fig. 3, the heating of the shaft material W is performed using a direct current heating method. Therefore, the shaft material holding groove C provided in the clamp chuck A is easily worn out by sparks, etc., and this wear causes molding defects, requiring replacement of the chuck.

As a conventional technique for the above-mentioned clamp chuck A, as shown in FIG.
There is a device in which an axial clamping groove 21 is provided on each surface of the outer periphery of the chuck block 20, and when the clamping groove 21 is worn out by sparks or the like, the direction of the chuck block 20 is changed and another clamping groove 21 is used.

However, in the clamp chuck A as described above, the part that wears out due to sparks etc. is the clamping groove 21.
Even though it is only a part of the head side end of the gripping groove 21, when each gripping groove 21 wears out, it is necessary to replace the entire gripping groove, which is extremely uneconomical.

Further, in a header employing a direct current heating method, a large number of heat dissipating slits 22 are usually provided perpendicularly to the length direction of the clamping groove 21 in order to suppress the rise in temperature of the chuck block 20 itself. By the way, the conventional clamp chuck A shown in FIG.
In addition to the slits 22 mentioned above, it is necessary to provide bolt insertion holes 23 on each surface of the outer periphery for attachment to the chuck support member.
2 cannot be made longer than necessary, and the machining thereof is exclusively electric discharge machining, which is disadvantageous in that the machining cost is high.

[Problem for invention]

Therefore, this idea solves the above disadvantages,
The technical challenge is to improve economic efficiency and reduce the processing cost of heat dissipation slits.

[Structure of the idea]

In order to solve the above problems, in this invention, one surface of the outer periphery of the prismatic chuck body is used as a mounting surface for the chuck support member, and at least one surface of the plurality of surfaces excluding the mounting surface is provided with a shaft material for processing. An axial fitting groove into which the chuck can be inserted and a plurality of heat dissipation slits perpendicular to the fitting groove are provided, and a rectangular shaped head of the same size as the tip side can be freely attached to and removed from the tip side of the chuck body. The molding head was attached to the molding head, and a clamping groove that could be aligned with the fitting groove was formed on each surface of the outer periphery of the molding head.

[Effect]

The clamp chuck with the above structure is designed to clamp the shaft material between the clamping groove of the forming head and the fitting groove of the chuck body extending thereto to perform head manufacturing, and the clamping groove of the forming head sparks. When the molding head is worn out by, for example, the molding head is reoriented so that another clamping groove is aligned with the fitting groove. When the clamping grooves of the forming head are worn out and head production becomes impossible, only the forming head is replaced with a new one, leaving the chuck body as it is.

〔Example〕

An embodiment of this invention will be described below with reference to FIG.

As shown in the figure, the clamp chuck A consists of a prismatic chuck body 1 and a rectangular molded head 10 attached to the distal end surface of the chuck body 1. A pin 2 is provided on the distal end surface of the chuck body 1. A plurality of screw holes 3 are formed at equal intervals on a concentric circle centered on the pin 2. On the other hand, the molding head 10 is provided with a pin hole 11 into which the pin 2 can be inserted, and a plurality of bolt insertion holes 12 that correspond to the screw holes 13. The forming head 10 can be fixed to the distal end surface of the chuck body 1 by tightening the bolt 13 screwed into the screw hole 3 from the hole 12.

The upper surface of the chuck body 1 serves as a mounting surface 4 for the chuck support member, and a plurality of bolt insertion holes 5 are formed in the mounting surface 4. Furthermore, an axial fitting groove 6 is provided on both side surfaces of the chuck body 1, and a large number of heat radiation slits 7 are formed perpendicularly to the length direction of the fitting groove 6. On the other hand, each outer peripheral surface of the forming head 10 has an axial clamping groove 1.
3' is provided. Each clamping groove 13' can be aligned with the fitting groove 6 of the chuck body 1 by rotating the forming head 10 about the pin 2.

The clamp chuck shown in the embodiment has the above structure, and the clamp chuck is screwed so that the mounting surface of the chuck body 1 overlaps the support surfaces of a pair of chuck support members (not shown), and the chuck body 1
As shown in FIG. 2, the shaft material is clamped using the fitting groove 6 and the clamping groove 13' of the forming head 10 which communicates with the fitting groove 6, and the head forming process is performed. When the end of the clamping groove 13' on the head side is worn out by sparks and the like and hedding becomes impossible during this process, the bolt 13 is loosened and the forming head 10 is rotated around the pin 2. Then, the other clamping groove 13' is aligned with the fitting groove 6. Further, when each clamping groove 13' of the forming head 10 becomes unusable, the forming head 10 is removed from the chuck body 1 and a new forming head 10 is attached to the chuck body 1.

〔effect〕

As described above, according to this invention, a rectangular molding head is removably attached to the tip surface of the chuck body, and a plurality of molding heads that can be aligned with the fitting groove of the chuck body are provided on each outer circumferential surface of the molding head. Since the clamping grooves are provided, each clamping groove can be used by changing the direction of the molding head, so it can be used for a long period of time, and these clamping grooves cannot be used. When this condition is reached, only the molding head, which is subject to heavy wear, can be replaced, leaving the chuck body as is, which is extremely economical.

In addition, since the fitting groove and the heat dissipation slit are provided on the flat surface of the chuck body excluding the mounting surface for the chuck support member, the length of the slit is long and the arcuate diameter of the bottom surface of the slit is large. I can do it. Therefore, the slit can be formed by normal cutting, and processing costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the clamp chuck according to the invention, Fig. 2 is a plan view of a shaft member clamped using the same chuck, and Fig. 3
The figure is a plan view of the shaft material with head milling applied to the tip end of the shaft material, and FIG. 4 is a perspective view showing a conventional clamp chuck. 1... Chuck body, 4... Mounting surface, 6... Fitting groove, 7... Slit, 10... Molding head, 1
3'...Holding groove.

Claims (1)

[Scope of utility model registration request] One surface of the outer periphery of the prismatic chuck body is used as a mounting surface for the chuck support member, and at least one surface of the plurality of surfaces excluding the mounting surface has an axial fitting groove into which a shaft material for machining can be inserted, and the fitting groove in the axial direction. A plurality of heat dissipation slits are provided perpendicular to the mating grooves, and a rectangular shaped head of the same size as the tip surface is removably attached to the tip surface of the chuck body, and the above-mentioned fittings are attached to each outer circumferential surface of the formed head. A clamp chuck for an electrically heated header with a clamping groove that can be aligned with the groove.