Manufacture method of a concave disc-shaped structure of bimetal strip

A manufacture method of a concave disc-shaped structure of bimetal strip, comprising:

• a). providing a bimetal strip, after stamping the bimetal strip has a positioning end, a free end corresponding to the positioning end, and a connecting lever extending inward from the free end, at the end of the connecting lever has a through hole, and the through hole has a connecting point, and an appropriate gap is cut at the center of the positioning end, and two symmetrical positioning holes are provided at the positioning ends on both sides of the gap, and two symmetrical assembling hole are provided outside the symmetrical positioning holes, and the center distance of the two symmetric positioning holes is D1, and the center distance of the two symmetric assembling holes is D2;
• b). providing a lug, after stamping the lug has a connecting pin, a combining surface connecting to the connecting pin, the combining surface has a connecting hole for penetration, and the outside of the connecting hole has two symmetrical rivets, define the width of the left and right sides of the connecting hole as W3, the center distance of the two symmetrical rivets is D4, and the D4 is smaller than D2;
• c). providing an assembling jig, the assembling jig includes a base seat, a first guiding pin and a second guiding pin parallelly arranged on the base seat, the center distance of the first guiding pin and the second guiding pin is D3, the width of the two outer edges of the first guiding pin and the second guiding pin is smaller than the width W3 of the connecting hole, and the base seat is provided with two protruding columns below the two symmetrical rivets of the lug, the protruding columns is used for positioning the bottom edge of the rivets and bearing the punching of the guiding hole of punch, so that the bimetal strip and the lug are smoothly riveted and combined;
• d). Sleeve the connecting hole of the lug into the first guiding pin and the second guiding pin, and make the bottom of the combining surface against the surface of the base seat;
• e). Sleeve the positioning hole of the bimetal strip into the first guiding pin and the second guiding pin from the top, making the bimetal strip arrange above the first guiding pin and the second guiding pin;
• f). providing a compression module, arranged above the first guiding pin 32 and the second guiding pin, the axial direction is provided with a shaft hole for the first guiding pin and the second guiding pin to extend, and two guiding hole of punch arranged on the outside of the two shaft holes, the compression module is sleeved into the first guiding pin and the second guiding pin from top to bottom, and then the bimetal strip is pressed down to make the two symmetrical positioning holes gradually turn inward to condense to the combining surface of the lug, further narrow the center distance D1 of the positioning holes of the bimetal strip to be equidistant from the center distance D3 of the first guiding pin and the second guiding pin, and narrow the center distance D2 of the two symmetrical assembling hole to D4 which is the same as the center distance of the two symmetrical rivets, and sleeve into the two symmetrical rivets, and use the two guiding holes of punch of the compression module, punch the riveting to deform it, and then riveting and bonding the bimetal strip and the lug;
• g). Raise the compression module, and the bimetal strip and the lug are removed upward from the assembling jig;
• and
• h). Form a concave disc-shaped structure of bimetal strip.