JPH0780213B2 - Mold for wire rod processing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire rod processing die capable of forming a hole in a wire rod by a push pin in a die.

(Prior Art) For example, in a circuit board connector, a large number of metal connector pins are arranged side by side in a synthetic resin body in a penetrating state. At the center of each connector pin, a hole is formed to prevent the pin from slipping out of the body. In this connector molding method, a retaining hole is formed in advance in the connector pin with a push pin of a press machine, and then this connector pin with a hole is slid in the guide groove of the die to mold the body. The connector is molded by inserting it in the cavity and filling the cavity with liquid synthetic resin. At the time of molding, part of the synthetic resin is filled in the hole at the center of the connector pin located in the cavity,
After curing, the connector pin does not easily come out of the body, strengthening its integration with the body.

(Problems to be solved by the invention) According to a conventional example in which a retaining pin is formed in a connector pin by a push pin of a press machine, according to a conventional example, the peripheral portion of the hole of the connector is plastically deformed due to the stress of the push pin, and both sides are formed. Swelling or "ku"
It bends like a letter. Considering this deformation such as bulging,
The width of the guide groove is set wider than that of the connector pin so that the pin can slide smoothly. Therefore, a gap is created between the inner side surface of the slide groove and the side surface of the connector pin, and this gap causes a part of the liquid synthetic resin from the cavity to flow into the guide groove. The synthetic resin flowing out to the portion adheres to the root portion of the pin, which causes a problem of electrical continuity with the circuit board during use, a pin that cannot be smoothly inserted, and a problem of poor contact.

An object of the present invention is to prevent synthetic resin from flowing out of a cavity into a guide path and adhering and hardening to a wire material such as a connector pin to cause conduction failure, or insertion and contact failure due to bending of the wire material.

(Means for Solving the Problems) In the present invention, a hole-forming push pin 16 that can be advanced and retracted, a guide body 6 in which a pin insertion hole 8 through which the push pin penetrates, and a guide body are provided. The guide 3 is provided with a base 3 which is in contact with the guide pin 5 and a guide path 5 which is located in a direction orthogonal to the advancing / retreating direction of the push pin and which can store and guide the wire P to be processed without a gap and communicates with the push pin insertion hole 8. The road is provided on either the base or the guide.

(Operation) The wire P to be processed is slidably accommodated by the guide path 5 without any gap, and the stress caused by the hole forming push pin 16 to open the hole Pa acts only in the longitudinal direction of the wire, and the plastic deformation force in other directions. Does not reach.

(Examples) Examples of the present invention will be described below.

In the mold shown in FIG. 1, of the fixed part 1 and the movable part 2, the specific structure of the fixed part side will be described first.

1 to 3, in the mounting plate 1a, a base 3 and a die base 4 adjacent to each other in the extrusion direction of the wire to be processed (downward in FIG. 1) are installed side by side. On the mating surface side of the base 3, a guide groove 5 which is a guide path for guiding a connector pin which is a wire to be processed is continuously provided with a predetermined pitch. As shown in FIG. 4, the guide groove is opened on the movable portion 2 side, and the connector pin P
It has a cross section substantially equal to the cross-sectional shape of Therefore, the guide groove 5 can accommodate the connector pin P so as to be slidable in the longitudinal direction without a gap. The opening of the guide groove 5 is covered with a lid 6 which is a guide.

As shown in FIG. 3, this lid is attached to the base 3 by bolts 7.
It is attached to. A thrust pin insertion hole 8 that is paired with the guide groove is formed in the lid body 6 at a position facing the guide grooves 5 in the longitudinal direction in a penetrating state.

A stopper plate 9 is arranged on the mold base 4 at the boundary between the adjacent bases 3. This stopper plate constantly protrudes from the die mating surface by a spring 10 provided at the lower portion, and has a role of preventing the tip of the connector pin P sent into the guide groove 5 from advancing. A long groove-shaped recess 11 is formed in the center of the mating surface of the mold base 4, and the body of the connector pin is molded by combining with a cavity 23 described later.

Next, a specific configuration of the movable section 2 will be described.

In FIG. 1, an ejector pin 14 attached to a support plate 13 is provided on the mounting plate 12 side of the movable portion 2 toward the fixed portion 1 side, and a holding plate 15 is attached to the ram of this ejector pin 14. . From this holding plate, a plurality of hole forming push pins 16
Are projected with a predetermined pitch. Each thrust pin can penetrate through the pin insertion hole 8 of the lid body 6, and its stroke reaches the inside of the guide groove 5. Then, the thrust pin 16 has a guide hole 17a in the guide portion 17 as shown in FIGS.
You can move back and forth. A notch 18 is formed at the end of the guide portion 17, and the lid 6 can be fitted in this notch. On the side of the guide portion 17 (upper side in FIG. 1), delivery pins 19 arranged at a predetermined pitch are attached to a holding portion 21 provided at the tip of the ram 20a of the cylinder 20. Each pin is located opposite to each guide groove 5, and the connector pin P in this guide groove is located.
Is for sending out to the cavity side. Moving part 2
The mold part 22 is provided adjacent to the guide part 17. As shown in FIGS. 5 to 7, a cavity 23 and a pin insert portion 24 are provided at the center of the mating surface on the fixed portion side of the mold portion 22. This cavity is for molding the body of the connector, and is connected to the pin insert portion that communicates with the guide groove 5 before and after it. The cavity 23 is located opposite to the concave portion 11 of the fixed portion 1, and the tip of the projecting pin 26 projecting from the movable plate 25 can extend therein.

The usage of the mold of the present invention will be described.

First, the connector pin P to be processed is inserted and set in each guide groove 5 which covers the opening with the lid 6. At this time, since the pins P are prevented from moving forward by the stopper plate 9, the pin tips are uniformly arranged on the base 3. Then, the movable part 2 is advanced toward the fixed part 1 and brought into contact with the mating surface of the fixed part. Then, as shown by the chain line in FIG. 1 and FIG. 8, the lid body 6 is fitted in the notch portion 18 of the guide portion 17 of the movable portion 2, and the die portion 22 is brought into contact with the die base 4 to make the stopper plate 9 The spring
It presses against 10 forces, so that the end face of the stopper plate is flush with the end face of the mold base 4, and each guide groove 5 is in communication with the pin insert portion 24. The tip of the thrust pin 16 is located in the pin insertion hole 8 of the lid.

Therefore, by the operation of the support plate 13 and the ejector pin 14,
The push pin 16 is advanced to pass through the insertion hole 8 and the connector pin P in the guide groove 5 is bored by the tip of the connector pin P with a predetermined pressing force (FIG. 9). At this time, the pin P is deformed only in the longitudinal direction. After drilling a predetermined depth, the thrust pin 16 is retracted, the delivery cylinder 20 is operated, the delivery pin 19 is advanced, and the processed connector pin P is joined from the guide groove 5. Cavity 23 and recess
When the connector pin hole Pa reaches the center of the cavity, the feeding is stopped. Then, liquid synthetic resin is filled into the cavity 23 through a runner, and after the synthetic resin is cured, the movable part 2 is retracted and then the projecting pin 26
Then, the connector C, which is a molded product shown in FIG. 10, is removed from the mold.

The guideway 5 may be provided on the side of the guide body 6 as shown in FIG. 11, and the guide body 6 may be provided on the movable part 2 as shown in FIG.
May be mounted on the side. Further, as shown in FIG. 13, the guide body may be attached to the movable portion 2 side. Further, as shown in FIG. 14, the advancing / retreating direction of the hole forming push pin 16 may be orthogonal to the mold opening / closing direction. In this case, the direction of the guide path 5 of the wire P to be processed, that is, the wire to be processed The insertion direction corresponds to the opening / closing direction of the mold, and the thrust pin is operated by using a cylinder instead of the ejector pin.

(Effect of the Invention) According to the present invention, when a hole is formed in a wire to be processed, the wire does not bulge or bend laterally as in the conventional case. Since there is no need to store and guide, synthetic resin can be prevented from flowing out of the cavity into the guide path, there is no conduction failure, there is no problem of insertion or contact failure, and drilling can be done in the mold, so processing and molding And can be done consistently.

[Brief description of drawings]

Fig. 1 is a sectional view, Fig. 2 is a plan view of a fixed part, Fig. 3 is a plan view of a main part, Fig. 4 is a sectional view taken along line IV-IV of Fig. 3, and Fig. 5 is a rear view of a movable part. 6 is an enlarged rear view of the cavity, FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, FIG. 8 is a sectional view showing a state of pin drilling, and FIG. 9 is a perspective view of a connector pin. FIG. 10 is a front view of the connector, and FIGS. 11 to 14 are explanatory views showing another embodiment. 3 ... Base, 5 ... Guideway, 6 ... Guide body, 8 ... Pin insertion hole,
16 ... Hole forming pin, P ... Wire to be processed, Pa ... Hole.

Claims (1)

[Claims] 1. A hole-forming push pin that can move forward and backward, a guide body having a pin insertion hole through which the push pin penetrates, a base that contacts the guide body, and a direction orthogonal to the forward and backward direction of the push pin. A guide path that is located in a direction that allows the wire to be processed to be stored and guided without a gap and communicates with the push pin insertion hole, and the guide path is provided on either the base or the guide body. A die for wire rod processing.