JPS6349576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cylindrical retainer that prevents an anchor bolt from coming out of a hole, and a jig for manufacturing the same. A metal cylinder 5 is inserted into a female mold 4 in which a plurality of recesses 2 are formed at intervals in the circumferential direction on the inner peripheral surface and cutting edges 3 are formed on the opening edge of the recess, and a metal cylinder 5 is inserted into the outer surface of the cylindrical body. A male mold 8 is attached to the metal tube 5, which has a plurality of protruding faces 6 that are spaced apart in the circumferential direction and have a thickness in the circumferential direction, and a tapered part 7 whose diameter becomes smaller toward the distal end of the cylindrical body. The cutting edge 3 cooperates with the cutting edge 3 to extrude and cut a metal tube portion corresponding to approximately the thickness of the cutting edge 6 into the recess 2. After that, the extruded and cut chips 9 are cut.
The specified invention is a method for manufacturing an anchor bolt retainer, which is characterized by press-cutting an anchor bolt from its root, and also includes a plurality of recesses 2 spaced apart in the circumferential direction on the inner circumferential surface of a round hole 1. A female mold 4 is formed with a cutting edge 3 on the opening edge of the recess, and a plurality of faces 6 which are spaced apart in the circumferential direction and have a thickness in the circumferential direction protrude from the outer surface of the cylindrical body. It has a male die 8 in which a tapered part 7 is formed in the face 6 portion of the tip, the diameter of which becomes smaller toward the tip, and a circular hole 10 that is concentric and the same diameter as the circular hole 1 of the female die 4, and the thickness of the face 6 is A metal cylindrical portion corresponding to the cutting edge 3 is pushed into the recess 2 by the face 6 and the cutting edge 3, and has a cutting blade 11 that comes into contact with the root of the cut chip 9 and cuts off the chip 9 in cooperation with the tip of the face 6. This invention relates to a combined invention of a manufacturing jig for an anchor bolt retainer characterized by comprising a cutting die 12.

As shown in Fig. 1, the conventional anchor bolt retainer was obtained by cutting the tip of a cylindrical metal tube 5' with a cutter a, so it was difficult to form the notch b. The disadvantage is that it requires a time-consuming cutting process, and in addition, it is not possible to form many notches b in the cylindrical metal tube 5' at once, which increases the number of man-hours and the overall productivity is extremely low. It was hot.

The present invention was made in view of these conventional drawbacks, and its purpose is to provide an anchor that can be produced by a pressing process without the cutting process, and which can greatly improve productivity. An object of the present invention is to provide a method for manufacturing a bolt retainer and a jig for manufacturing the same.

Embodiments of the present invention will be described in detail below with reference to the drawings.
Reference numeral 4 is a female type, in which a plurality of recesses 2 are bored at intervals in the circumferential direction on the inner circumferential surface of a round hole 1 having a diameter approximately equal to the outer diameter of a cylindrical metal tube 5. Recess 2 is wider towards the back, and there are chips inside recess 2 (described later).
It is structured so that it is easy to get into. A cutting edge 3 is formed at the opening edge of the recess. 8 is male type;
A plurality of faces 6 having a thickness in the circumferential direction and spaced apart from each other in the circumferential direction are provided on the outer surface of a cylindrical body having a diameter substantially equal to the inner diameter of the cylindrical metal tube 5. The male type has a tapered portion 7 formed in the face 6 portion at the tip of 8, the diameter becoming smaller toward the tip. Both edges of face 6 are edge 1
It has become 3. As shown in FIG. 4a, the metal tube 5 is placed in the round hole 1 of the female die 4, and the lower end is attached to the metal tube 5 received on the base 14 via a knockout pin (described later). On the other hand, the male die 8 attached to the press device (not shown) is lowered in the direction of the arrow, and as the male die 8 is inserted into the metal cylinder 5,
The edge 13 of the tapered part 7 at the tip of the face 6 and the female die 4
With the cooperation of the cutting edge 3, the metal tube 5 part is cut into the face 6.
The notches b are cut outwards into the recess 2 over a width corresponding to the thickness of the metal cylinder 5, so that a plurality of notches b can be formed at once in the metal cylinder 5 using a press. In the embodiment, the number of recesses 2 and faces 6 is four, but the number may be greater or less than these.

Reference numeral 12 denotes a chip cutting die, which is set on a base 14, and the female die 4 is placed on the chip cutting die 12. The chip cutting die 12 has a round hole 1 in the female die 4.
A circular hole 10 having the same diameter is formed, and the circular hole 1 and the circular hole 10 are set concentrically. The lower half of the metal cylinder 5 is inserted into the circular hole 10, and the above-described pressing process of the male mold 8 is performed. A cutting blade 11 is formed around the circular hole 10 at the upper edge of the chip cutting die 12.
Thus, the root portion of the chips 9 cut down into the recess 2 in the first step can be cut off by the cooperation of the edge 13 of the tapered portion 7 of the face 6 and the cutting blade 11. The chip cutting die 12 has a discharge hole 1.
5 is formed by penetrating it vertically. Discharge hole 15
is in communication with a hole 16 provided in the base 14, so that chips 9 whose root portions have been cut fall and are discharged below the base 14.

17 is a knockout pin, and the large diameter portion 18
A metal tube 5 is placed on top, and a small diameter portion 19 is inserted into the base 14 so as to be freely movable up and down. After cutting off the chips 9 from the metal cylinder 5, the knockout pin 17
By raising the metal tube 5, the obtained stopper 20 is taken out.

The thus obtained retainer 20 is obtained by inserting an anchor bolt 21 whose diameter gradually increases as shown in FIG. , a nut 26 is screwed onto the anchor bolt 21 via the washer 24 and the pulling washer 25, and as the nut 26 is rotated, the large diameter portion 21a of the anchor bolt 21 is tightened.
is press-fitted into the retainer 20, and each circumferentially divided retaining locking edge 27 is pushed out in the hole 23 to prevent the anchor bolt 21 from coming off. A circumferential groove 28 is formed in the metal cylinder 5 by cutting to prevent it from slipping out of the hole 23.

In summary, in the specific invention, a male die is inserted into a metal cylinder placed in a female die, and the face of the male die cooperates with the cutting edge of the female die to cut a portion of the metal cylinder corresponding to the thickness of the face. Since this is a method of cutting down outwards and then press-cutting the cut-down chips, the press not only performs the cutting process of the chips, but also the process of cutting up chips with a width equivalent to the thickness of the face on the outside of the metal tube. This can improve productivity compared to methods using conventional cutting means.In addition, since it is a press, multiple notches can be cut at once, greatly increasing overall productivity. It has the advantage that it can be improved. Furthermore, in the case of merged inventions,
In addition to the effects of the specific invention, since the chip cutting die is formed with a cutting blade that comes into contact with the root of the chip and cuts off the chips in cooperation with the tip of the face, after cutting the chips with the male die, Chips can be separated at the tip of the face. In other words, by providing the tip of the face with the function of separating chips, there is an advantage that the jig configuration can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a retainer obtained by the conventional method, Figs. 2a and b are side views and horizontal sectional views of the male mold of the present invention, and Fig. 3 is a plan view and a horizontal sectional view of the female mold of the same. Figures 4a and b are longitudinal cross-sectional views showing the same method as above, Figure 5 is an exploded perspective view of the retainer obtained by the above method and parts associated therewith, and Figure 6 is a sectional view of the same method in use. 1 is a round hole, 2 is a recess, 3 is a cutting edge, 4 is a female die, 5 is a metal cylinder, 6 is a face, 7 is a tapered part, 8 is a male die, 9 is a chip, 10 is a circular hole, 11
1 is a cutting blade, and 12 is a chip cutting type.

Claims (1)

[Scope of Claims] 1. A metal cylinder is inserted into a female mold in which a plurality of recesses are formed at intervals in the circumferential direction on the inner peripheral surface of a round hole, and cutting edges are formed at the opening edges of the recesses, A male die is provided with a plurality of protruding faces on the outer surface of the cylindrical body that are spaced apart in the circumferential direction and have a thickness in the circumferential direction, and a tapered part that becomes smaller in diameter toward the tip of the cylindrical body is formed on the face at the tip of the cylindrical body. The metal cylinder is pushed into the interior of the metal cylinder, and the metal cylinder part corresponding to approximately the thickness of the face is extruded and cut into the recess by the cooperation of the face and the cutting edge, and then the extruded and cut chips are press-cut from the root part. A manufacturing method for a feature that prevents anchor bolts from coming off. 2. A female mold in which a plurality of recesses are formed at intervals in the circumferential direction on the inner peripheral surface of a round hole, and cutting edges are formed at the opening edge of the recess, and The male type has multiple thick faces protruding in the circumferential direction, and the face at the tip of the cylindrical body has a tapered part that becomes smaller in diameter toward the tip, and the female type has a circular hole concentric with the same diameter. A cutting blade that has a circular hole and has a metal cylinder portion corresponding to the thickness of the face, which is pushed into the recess by the face and the cutting edge, contacts the root of the cut chips, and cuts off the chips in cooperation with the tip of the face. 1. A manufacturing jig for an anchor bolt retainer, characterized by comprising a chip-cutting mold having the following features: