JPS5848259B2 - Special bolt manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a socket wrench by forming the outer periphery of the head of the bolt into a dodecagonal shape for the purpose of high force and high torque, and further forming a hexagonal hole on the top surface of the head of the bolt. This invention relates to a bolt manufacturing device that efficiently and continuously shapes a special bolt using a material transfer type bolt former that allows the use of both a hexagonal wrench and a hexagonal wrench tool.

The present invention will be described below with reference to the embodiment shown in the figure. 1' is a bolt former machine base, and on the front side, several dies 2a, 2b, 2c are arranged at predetermined intervals along with a quill 3 for supplying material a in order of roughness and precision. Punches 5a, 5b, and 5c corresponding to each of the dies are provided on the front surface of the ram 4, which is arranged in parallel and can be moved back and forth in front of the machine 1, and protrudes from the holding case 5, respectively. There is.

A cutter bar 6 is located on the front side of the quill 3 and is movable left and right in relation to the back and forth movement of the ram 4. When the ram moves forward, the cutter bar 6 cuts the material a of a certain size and transfers it to the front of the die 2a. Reference numeral 7 denotes a protruding pin inserted into each of the dies, which moves forward when the ram 4 retreats to push out each material press-fitted into the dies forward.

Although not shown, there is a material transfer claw at the front of the machine base 1 that grasps and transfers the press-fit material to the front of the next die when the ram retreats and the press-fit material is pushed out to the front of each die. It is provided so that it can be moved left and right between adjacent dice.

In the present invention, the final punch 5c that forms the head of the bolt material is made into a cylindrical shape, and the front part 5' thereof is made to protrude forward from the front surface of the punch holding case 5, so that the inner periphery of the front half is formed in the previous process. The circular head of the bolt material C preformed by the die 2b and the punch 5b and the front part of the die 2c for receiving this head are tightly fitted into a circular part 8, and the inner periphery of the rear part has a triangular cross section. A protruding strip 9 consisting of 12 circumferential strips forming a key is provided to protrude inwardly, and inside this punch 5c is an extruded tube 10 made of a material that moves forward when the ram 4 retreats. A rod 11 located inside the punch and capable of moving forward and backward together with the punch.
are inserted through each rod body 11, and the hexagonal tip protrusion 11' of the rod body 11 is made to protrude to the front of the extruded tube 10 so as to substantially correspond to the formed inner end of the protrusion 9 provided on the rear half of the punch 5c. When the ram 4 moves forward, this protrusion 1
1' and the front end of the protrusion 9 can reach a position approximately eight minutes from the head end surface of the bolt material.

The angle of the hexagonal rod protrusion 11' is made to match the top of the protrusion 9, and 12 in the figure is inserted into a seat 13 fitted at the rear of the extruded pipe. , Ram 4
This is an intermediate pin that moves forward when the extrusion tube 10 is retreated to extrude the extrusion tube 10 forward.

FIG. 5 shows a punch 1 which is another embodiment of the punch 5c described above.
5c, the punch has a circular portion 18 on the inner periphery of the front half extending from the inner periphery of the rear half on which the protruding stripes 19 are formed, via a widening slope 20.

Next, regarding the operation of the device of the present invention, each time the ram 4 moves forward, the material a fed out from the quill 3 to a certain size is cut by the cutter par 6 and transferred to the front part of the die 2a. When the ram advances, each die 2a, 2
The materials placed in front of dies b and 2c are all press-fitted into the dies by opposing punches 5a, 5b and 5c, and the ram 4 moves back and the materials in each die are pushed out and machined by pins 7. When it is pushed out to the front of the table, it is gripped by the transfer claw and transferred to the front part of the next die, so that the material a is sequentially formed as shown in FIG. A more desired product can be obtained each time the ram 4 moves back and forth.

By the way, according to the present invention, the punch 5c that forms the final head shape is cylindrical, and the inner periphery of the first half contains the head C of the bolt material shaped in the previous step and the die 2c that receives it.
The front part is a circular part 8 into which the front part is tightly fitted, and the inner periphery of the rear part has 12 protruding strips 9 projecting in the circumferential direction. Since the hexagonal tip protrusion 11' of 11 is positioned so as to hang in correspondence with the protrusion 9, when the ram 4 moves forward and press-fits the material C into the opposed die 2c, the inside of the circular part 8 is When the head of the material is fitted into the punch 5c and the ram is further advanced to the frontmost position shown in FIG.
While the punch is restrained inwardly, a dodecagonal part is simultaneously formed on the outer periphery by the protruding strip 9 on the inner periphery of the rear half of the punch, and a hexagonal hole is simultaneously formed on the upper surface of the head by the rod protrusion 11'. At the moment of retreat, the extrusion tube 10 is moved forward by the operation of the intermediate pin 12, leaving the certain shaped material d inside the die 2c and retreating, and then, by the forward movement of the ejecting pin 7, it is taken out of the die. It is.

In this way, when using the apparatus of the present invention, when forming the polygonal parts on the inner and outer peripheries of the head, the head of the material is first fitted into the circular part on the inner periphery of the front half of the punch, thereby forming the material into the opposing die. By holding the head in a restrained state within the punch and then moving the punch further forward, the desired polygonal parts are simultaneously formed on the inside and outside of the head, making it possible to efficiently form a neat head without losing its shape. It is.

In addition, when using the apparatus shown in FIG. 5, a bolt material d' having a flange e on the lower surface of the head is obtained, and each material d, d
By forming a screw e on the shaft of ', the completed bolt f,
f' is obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main part of the device of the present invention, and the second section is the same cross-sectional view showing the relationship between a specific pinch and the die during the forward movement of the ram.
Fig. 3 is a cross-sectional view of the punch taken along the line A-A in Fig. 2, Fig. 4 is a partially cutaway front view showing the order of forming the materials, and Fig. 5 is a cross-section of a specific punch and die showing another embodiment. Fig. 6 is a partially cutaway front view showing another example of the material, Fig. 7 is a front view of a completed bolt, and Fig. 8 is a plan view thereof. 1 is the machine base, 2a, 2b, 2c are the dice, 4 is the ram, 5a
, 5b, 5c are punches, 7 is a protruding pin, 8 is a circular part,
9 is a convex strip, 10 is an extruded tube, 11 is a rod, and 11' is a tip projection.

Claims (1)

[Claims] 1. The inner periphery of the front half of one of the opposing punches and dies that form the head of the bolt material tightly fits the head of the material formed in the previous process and the front part of the die that receives it. It has a circular part, and on the inner periphery of the rear half, 12 convex strips in the circumferential direction are provided protruding toward the center, and an extruded tube that can be advanced when the ram retreats is inserted into the inside of this punch. , and at a position substantially corresponding to the inner end of the convex line, the hexagonal tip of the rod is capable of thrusting into the center of the head of the material up to about the 8th point from the tip when the ram is fully advanced. A special bolt manufacturing device characterized by having a protrusion positioned therein.