JPS61101920A - Manufacture of tubular contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to small electric equipment, electronic equipment, etc., in which the legs of tubular contacts, that is, rivet-type contacts, used in switches, relays, etc. are made into a tube shape. The present invention relates to a method of manufacturing a tubular contact which facilitates caulking of a composite material into a contact mounting hole.

(Prior art and its problems) Conventionally, in order to manufacture tubular contacts, the steps shown in Figs.
As shown in the figure, six first to sixth dies 1 to 6 are provided at equal angular intervals in the circumferential direction of the turntable T, and a contact wire 7 is placed above the first station where the first die 1 is located. A cutter 8 that also serves as a guide for feeding into the die 1 is provided, a preforming punch 9 is provided above the third station where the third die 3 is located so as to be movable up and down, and a first tubular pin 10 is provided below so as to be movable up and down. A finishing forming punch 11 is vertically movably provided above the fifth station where the fifth die 5 is located, a second tubular pin 12 is vertically movably provided below the fifth station, and the sixth die 6 is located. Knockout pin 1 below the 6th station
3 is provided so as to be movable up and down.

To explain the method of manufacturing tubular contacts using this manufacturing device, when a contact wire 7 is fed to a predetermined length through a cutter 8 that also serves as a guide and into a die hole of a first die 1 of a turntable T located at a first station, The turntable T rotates and the contact wire 7 is cut by the cuckoo 8, leaving the contact material 14 in the die hole. The turntable T then stops at the position where the first die 1 is at the second station. Then, the sixth die 6 is located at the first station, and the contact wire 7 is supplied to the die hole of the sixth die 6 in the same manner as described above. The turntable T rotates again, and the first die 1
When it stops at the third station, the preformed bunch 9 descends from above and is set on the top surface of the first die I. At the same time, the first tubular pin 10 rises from below and enters the die hole, and the contact material is removed. 14 and contact material 1
The upper part of 4 is preformed into a lump shape using a preforming punch 9, and the lower part is formed into a tube shape. and the 6th die 6
is located at the second station, the fifth die 5 is located at the first station, and the contact wire 7 is supplied to the die hole in the same manner as described above. Preformed bunch 9 at third station position
rises and the first tubular pin 10 descends and passes through the die hole, the turntable T rotates and the first die 1 is located at the fourth station and stopped. and the sixth
The die 6 is located at the third station to preform the contact material 14, the fifth die 5 is located at the second station, and the fourth die 4 is located at the first station so that the contact wire 7 is formed into the die. supplied to the hole. The preformed bunch 9 at the third station position rises, and the first tubular pin 10
When it descends and passes through the die hole, evening )−
When the table T rotates and the first die 1 stops at the fifth station, the second tubular pin 12 rises from below and enters the die hole, fitting into the tubular lower part of the contact material 14 and at the same time A finish forming punch 11 descends from above, and the aggregate-like upper part of the contact material 14 is finished formed into a rivet-type tubular contact 15. During this time, the fifth die 5 is located at the third station to preform the contact material 14, and the third die 3 is located at the first station and the contact wire 7 is supplied to the die hole. When the finish forming punch 11 at the fifth station position rises and the second tubular pin 12 descends and passes through the die hole, the turntable T rotates, and when the first die 1 stops at the sixth station, it moves downward. The knockout pin 13 rises, enters the die hole, the tubular contact 15 is pushed out, is ejected from the die hole, and is scraped out from above the turntable T by a scraping plate (not shown).

During this time, the sixth die 6 is positioned at the fifth station to perform final forming of the contact material 14, the fourth die 4 is positioned at the third station to perform preforming of the contact material 14, and the first station is located at the fifth station. The second die 2 is positioned and the contact wire 7 is supplied to the die hole. When the knockout pin 13 at the sixth station position descends and exits from the die hole, the turntable T rotates and stops when the first die 1 is located at the first station, and the previous process begins again.

In this way, tubular contacts IS are manufactured intermittently.

However, in the conventional manufacturing method of tubular contacts, each die is rotated and stopped intermittently.
- 6 are not repeatedly positioned accurately each time at each position from the first station to the sixth station. It was difficult to finish forming the contact material 14 at the 6th station and to discharge the tubular contact 15 at the sixth station, and even if these steps were carried out, only a tubular contact 15 with poor dimensional accuracy could be obtained. Therefore, the turntable T rotates intermittently.

Extremely high precision was required to control the stop, but as the die wore out with use, the first problem occurred. Third. ff15
．． Canter 8 and preform punch 9 at the 6th station
It becomes impossible to align the dies with the first tubular bin 10, finish forming punch 11, second tubular pin 12, and knockout pin 13. Therefore, check frequently, and if there is even one die that cannot be aligned, immediately remove the dies. The equipment had to be replaced, resulting in extremely low operating rates and poor productivity.

(Objective of the Invention) The present invention has been made to solve the above-mentioned problems, and is capable of accurately and easily supplying contact material to the die hole of a single die that is always in a fixed position, and using this die hole to supply the contact material. Pre-forming of the contact material, final forming of the contact material, ejection of the tubular contact, etc. can be performed accurately and reliably, making it easy to obtain tubular contacts with high dimensional accuracy.Moreover, die wear can be reduced and inspection frequency can be reduced. It is an object of the present invention to provide a method for manufacturing tubular contacts that can reduce the number of contacts, increase the operating rate, and improve productivity.

(Structure of the Invention) The method for manufacturing a tubular contact of the present invention involves cutting a contact material to a required length, gripping the contact material, and transporting and stopping the contact material to a position in front of a die hole, and then moving the first punch forward. Then, the contact material is press-inserted into the die hole, and the die is retreated against the elastic body, and the contact material is preformed into a head agglomerate bent shape with a first punch, and the legs are inserted into the die hole. The tip of the knockout pin disposed inside the knockout pin is formed into a tube shape using the sharp narrow diameter part, and then the first punch is retracted and the die is advanced by the restoring force of the elastic body, and the tube-shaped leg part of the knockout pin is formed into a tube shape. It separates from the sharp narrow diameter part at the tip, and then the second
The punch is advanced and the die is moved back against the elastic body to fit the leg of the preformed rivet type contact material into the sharp narrow diameter part of the tip of the knockout pin, and the head is shaped into an oval shape using a second punch. Finish molded with tubular contacts and no
Then, the second punch is moved back to restore the die to its elastic state.
(The tubular leg is moved forward by force and detached from the sharp narrow diameter part at the tip of the knockout pin, and then the knockout pin is ejected twice to eject the tubular contact from the die hole.)

(Example) An example of the method for manufacturing a tubular contact of the present invention will be described. First, the manufacturing apparatus for implementing the present invention will be described with reference to FIG. 1. Reference numeral 20 denotes a die holder, in which a through hole 21 is bored in which a large diameter portion and a small diameter portion are continuous laterally. A cylindrical guide 22 is fitted and fixed in the large diameter part 21a of the through hole 21, and the inner diameter of the cylindrical guide 22 is made small, and the inner diameter of the middle part and the rear part is the small diameter part 21b of the through hole 21. It is made in a larger diameter. A die 23 is slidably fitted into a small diameter portion at the front of the cylindrical guide 22, and a flange 2 at the rear outer periphery of the die 23 is fitted.
4 is slidably fitted into the large diameter portion at the rear of the guide 22.

Further, a cylindrical stopper 26 having a flange 25 on the inner peripheral side of the rear end is fitted and fixed to the large diameter portion at the rear of the guide 22 . A knockout pin 29 having a sharp narrow diameter portion 28 at the tip is slidably disposed in the die hole 27 at the center of the die 23, and the rear end of the knockout pin 29 is connected to a support 30.
The support 30 is connected to a piston rod 32 of a cylinder 31 disposed in the small diameter portion of the through hole 21 of the die holder 20. The support tool 30 is slidably fitted to the flange 25 at the rear end of the stopper 26, and the support tool 30
A flange 33 on the outer periphery of the front end is abuttingly engaged with the flange 25. Further, a tubular elastic body 34 made of urethane rubber is fitted between the die 23 and the flange 33 of the support 30 on the outer periphery of the knockout pin 29.

Opposed to the die 23, a first bunch 35 is horizontally slidably provided on a vertically movable punch holder 36, and below this first punch 35, a second bunch 37 is slidably provided in parallel on the punch holder 36. possible. The first bunch 35 and the second bunch 37 are moved forward and backward by cylinders 38 and 39, respectively, and a recess 40 having a trapezoidal cross section is provided in the center of the tip surface of the first punch 35,
An oval-shaped recess 41 is provided at the center of the front end surface of the bunch 37. Punch holder 36 and die holder 20
A contact wire cutting, gripping and feeding device 42 is provided above between the contact wire cutting, gripping and feeding device 42, and the contact wire cutting, gripping and feeding device 42 is provided with a stopper 43 for stopping the horizontally fed contact wire 47, and a cylinder 44 that allows the contact wire to be cut and fed downward by a cylinder 44. It consists of a cutter 45 that moves forward to cut the contact wire, and a chuck 46 that grips the contact wire to be cut.

Next, an embodiment of a method for manufacturing a tubular contact according to the present invention will be described, in which a tubular contact is manufactured using the manufacturing apparatus configured as described above. As shown in FIG. 1, the contact wire 47 is fed horizontally above the die holder 20, and when it hits the stopper 43 of the contact wire cutting, gripping and feeding machine 42 and stops, the tip of the contact wire 47 is held in the chuck 46. At the same time, the cylinder 44 is activated and the cutter 45 and chuck 46 advance downward to cut the tip of the contact wire 47, and the cut contact wire 48 is inserted into the die 2 as shown by the chain line.
It is fed to the front position of the die hole 27 of No. 3 and stopped. Next, as shown in FIG. 2g, the cylinder 38 is actuated to move the first bunch 35 forward, and at the same time the contact material 48 is pressed, the chuck 46 is released, the cutter 45 and the chuck 46 retreat upward, and the contact material 48 is pressed. The material 48 is inserted into the die hole 27, and when the contact material 48 is further pushed into the die hole 27 by the first bunch 35, the first bunch 35 is inserted as shown in FIG.
contacts the front surface of the die 23, the die 23 retreats against the elastic body 34 made of urethane rubber, and the contact material 48
The head is preformed in the first bunch 35 into a glue hent shape, and the leg portion is formed into a tube shape at the sharp narrow diameter portion at the tip of the knockout pin 29 disposed in the die hole 27. Ru. Next, as shown in FIG. 2C, the first bunch 35
When the die 23 retreats, the die 23 moves forward due to the restoring force of the elastic body 34, and the tubular leg portion separates from the sharp narrow diameter portion 28 of the knockout pin 29. Next, as shown in FIG. 2d, the punch holder 36 rises and stops when the second punch 37 is aligned with the die 23, and the cylinder 39 is actuated to advance the second punch 37, leaving the die 23 in reserve. The preformed rivet type contact material 48' is pressed through the molded rivet type contact material 48' and is retracted against the elastic body 34.
The leg part of the knockout pin 29 is fitted into the sharp narrow diameter part 28 of the knockout pin 29, and the head part is finished and formed into an oval shape by a second punch 37 to form a tubular contact 49.

Next, as shown in FIG. 2e, the second punch 37 retreats, the die 23 moves forward due to the restoring force of the elastic body 34, and the tubular leg part separates from the sharp narrow diameter part 28 of the knockout pin 29. Thereafter, as shown in FIG. 2f, the knockout pin 29 is pushed out by the operation of the cylinder 31, and the tubular contact 49 is pushed out from the die hole 27. At this time, the knockout pin 29 is partially fitted into the leg of the tubular contact 49, so the knockout pin 29 is moved back as shown in FIG. is inserted into the knockout pin 2
9 is extracted from the leg. Then, as shown in the second diagram, the knockout pin 29 is pushed out again, and the tubular contact 49 is ejected and dropped from the die hole 27. After the punch holder 36 is lowered and the first bunch 35 is aligned with the die 23, the above steps are repeated to form a tubular contact 49 lacking oxygen.

(Effects of the Invention) As can be seen from the above explanation, the method for manufacturing tubular contacts of the present invention involves inserting and supplying the contact material into the die hole of one die that is always in a fixed position. It can be inserted and fed accurately and easily, and the first
Preforming and finishing forming of the contact material using a punch and a second punch, ejection of the tubular contact by ejecting the knockout pin twice, etc. can be performed accurately and reliably.
Tubular contacts with high dimensional accuracy can be easily obtained. In addition, the method for manufacturing tubular contacts of the present invention allows the contact material to be accurately inserted into the die hole as described above, and the contact material can be preformed and finished formed accurately. Wear, damage, etc. are significantly reduced,
Therefore, the frequency of inspections is reduced, and the operating rate is increased accordingly, which has the effect of improving productivity.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing a manufacturing apparatus for carrying out the method for manufacturing tubular contacts of the present invention, FIGS. FIG. 4 is a schematic plan view showing a manufacturing apparatus for carrying out the conventional method for manufacturing tubular contacts, and FIG. 4 is a developed vertical cross-sectional view taken along the line A--A in FIG. 3 showing steps in the conventional method for manufacturing tubular contacts.

Claims (1)

[Claims] The contact wire material is cut to a required length, the contact material is gripped, and the conveyance is stopped at the front position of the die hole.Then, the first punch is advanced to press and insert the contact material into the die hole, and the die is inserted. The head of the contact material is preformed by the first punch by retreating against the elastic body, and the leg part is formed into a tube shape by the sharp narrow diameter part of the tip of the knockout pin placed in the die hole. Then, the first punch is moved back and the die is moved forward by the restoring force of the elastic body, so that the tube-shaped leg part is separated from the sharp narrow diameter part of the tip of the knockout pin, and then the second punch is moved forward and the die is moved forward. The leg of the preformed rivet type contact material is fitted into the sharp narrow diameter part of the tip of the knockout pin, and the head is finished formed with a second punch to form a tubular contact. Next, the second punch is retreated and the die is moved forward by the restoring force of the elastic body, so that the tubular leg part is separated from the sharp narrow diameter part at the tip of the knockout pin, and then the knockout pin is pushed out twice to remove the tubular leg. A method for manufacturing tubular contacts in which the contacts are ejected from the die hole.