JPH0821284B2 - Lower mold for manufacturing rivet contacts with leg throttle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a lower mold of a mold for manufacturing a rivet contact having a diaphragm on a leg.

(Prior Art) Conventionally, a lower die of a header die used for making a rivet contact having a squeeze on a leg is a die 1 as shown in FIG.
An annular diaphragm inclined surface 3 is provided below the circular hole 2, and a pin hole 4 is provided concentrically with the circular hole 2 from the lower end of the annular diaphragm inclined surface 3, and a knockout pin 5 is vertically arranged in the pin hole 4. It is slidably fitted into and inserted into.

(Problems to be Solved by the Invention) By the way, in the lower mold of the above structure, the annular drawing inclined surface 3 of the lower portion of the circular hole 2 of the die 1 and the upper flat surface 5a of the knockout pin 5 are too mirror-finished, so that the rivet contact is made. When the material inserted into the circular hole 2 of the die 1 is processed into a header in order to make, the material slips and enters the 0.005mm clearance between the pin hole 4 and the knockout pin 5, and as shown in FIG. A burr 7 having a length of 0.03 to 0.1 mm was formed at the peripheral edge of the lower end surface of the rivet contact 6 having the leg 6a and the aperture 6b.
The rivet contact 6 with the flash 7 is inserted into the contact mounting hole of the base material and caulked to make an electric contact. When this is used for a relay or the like, the flash 7 crushed by caulking during use is torn off. There is a problem in that the particles are scattered and cause contact failure and malfunction.

(Object of the Invention) The present invention has been made to solve the above problems,
It is an object of the present invention to provide a lower die for manufacturing a rivet contact with leg portions, in which burring does not occur at the lower edge surface of the leg portion of the rivet contact.

(Means for Solving the Problems) A lower die for manufacturing a rivet contact with leg draws according to the present invention for solving the above problems is provided with an annular throttle inclined surface below a circular hole of a die and an upper end of a knockout pin. The flat surface is made to have a roughness of 1 to 6 μm by electric discharge machining.

1 to 6 μm for the inclined surface of the annular diaphragm and the flat upper surface
The reason why the roughness is less than 1 μm is not enough to prevent the material from slipping during header processing, and if it exceeds 6 μm, the squeezing surface and the lower end surface of the rivet contact leg become rough and the base material contact mounting This is because, when it is inserted into a hole and caulked, a fine mustache is torn off and cut into the surface, or it bends and becomes dirty.

(Operation) With the header die having the manufacturing lower die configured as described above, the material is inserted into the circular hole of the die to make the rivet contact, and the header is machined. The plastic deformation without slippage on the surface and the plastic deformation without slippage on the top flat surface of the knockout pin do not allow the material to enter the clearance between the knockout pin and its pin hole, so A rivet contact with leg squeezing without burrs is obtained.

(Embodiment) An embodiment of a lower die for manufacturing a rivet contact with a leg portion according to the present invention will be explained with reference to FIG. 1. 1 is a die made of cemented carbide, having a diameter of 0.95 to 3.45 mm and a depth of 0.5 to 3.0 mm. An annular diaphragm inclined surface 3 having a width of 45 ° and a width of 0.1 to 0.3 mm is provided at the bottom of the circular hole 2. The SKH knockout pin 5 is provided in the pin hole 4 so as to be vertically slidable. Then, the annular drawing inclined surface 3 below the circular hole 2 of the die 1 and the upper end flat surface 5a of the knockout pin 5 are made to have a roughness of 1 to 6 μm by electric discharge machining.

The circular hole 2 of the lower die for manufacturing 1 configured as described above
0.9 to 2.85 mm in diameter, 1-4 mm thick Ag tip and 0.9 in diameter
After inserting a clad material bonded to a Cu chip having a thickness of up to 2.85 mm and a thickness of 2 to 10 mm and performing header processing by processing pressure of an upper die (not shown), the clad material is an annular drawing inclined surface 3 below the circular hole 2. Plastic deformation without slipping, and the material also plastically deformed without sliding on the top flat surface of the knockout pin 5, so 0.005m between the knockout pin 5 and the pin hole 4
The material did not enter into the clearance of m, so that there was no flash on the peripheral edge of the lower end surface of the rivet contact 6 obtained as shown in FIG.

(Effects of the Invention) As can be seen from the above description, the lower die for manufacturing the rivet contact with leg draw of the present invention is provided with a pin from the lower end of the annular throttle slanted surface under the circular hole of the die. The top flat surface of the knockout pin, which is slidably inserted vertically into the hole, is made to have a roughness of 1 to 6 μm by electrical discharge machining, so the material inserted into the circular hole of the die during header processing is It does not slip on the inclined surface of the annular throttle and also does not slip on the flat surface of the upper end of the knockout pin, and plastically deforms, and no material enters the clearance between the knockout pin and its pin hole. Therefore, a rivet contact with leg squeezing without burrs on the lower edge of the leg can be obtained. Even if this rivet contact is inserted into the contact mounting hole of the base material to make an electric contact and used for a relay, etc. As described above, the burrs crushed by the caulking are not torn and scattered to cause a contact failure or a malfunction.

[Brief description of drawings]

FIG. 1 is a sectional view of a lower die for manufacturing a rivet contact with leg drawing according to the present invention, and FIG. 2 is a rivet contact obtained by header processing with a header die having the lower die for manufacturing of FIG. FIG. 3 is a sectional view of a conventional lower die for manufacturing a rivet contact with leg draws, and FIG. 4 is obtained by header processing with a header die having the lower die for manufacturing of FIG. It is a front view of a rivet contact point.

Claims (1)

[Claims] 1. A lower die for manufacturing a rivet contact with leg draws, wherein an inclined face of an annular drawer under a circular hole of a die and an upper flat face of a knockout pin are 1 to 6 μm by electric discharge machining.
Lower mold for manufacturing rivet contacts with leg drawdowns, characterized by being made to have a rough surface.