A positionable pre-punching rivetless constant temperature stamping die and its control method

Abstract

The invention discloses a pre-hole-punching rivet-free constant-temperature stamping die capable of performing positioning. The stamping die comprises a punch, a lower die holder and a hydraulic cylinder. The punch is of a circular truncated cone structure. The radius of the upper surface of the punch is larger than that of the lower surface of the punch. The center of the lower die holder is a containing cavity. The upper portion of the containing cavity is a regular circular truncated cone cavity, and the lower portion of the containing cavity is provided with a through hole. An upper end opening of the regular circular truncated cone cavity is formed in the upper plane of the lower die holder, and the lower end of the regular circular truncated cone cavity is communicated with the through hole. The hydraulic cylinder is located in the through hole. A piston of the hydraulic cylinder stretches out of the upper end opening of the regular circular truncated cone cavity in the non-stamping process. The punch and the lower die holder are both provided with a cooling channel and are provided with a temperature sensor and a controller. The invention further discloses a control method of the pre-hole-punching rivet-free constant-temperature stamping die capable of performing positioning. The pre-hole-punching rivet-free constant-temperature stamping die capable of performing positioning achieves connection between high-strength steel and aluminum alloy without rivets and has the advantages that accurate positioning can be achieved, and meanwhile riveting accuracy is not affected due to the cooling punch and the die.

Description

technical field [0001] The invention relates to the field of rivetless stamping dies, in particular to a positionable pre-punching rivetless constant temperature stamping die and a control method thereof. Background technique [0002] In order to pursue the lightweight of the body, without changing the body specifications, the weight of the body structure can be realized by optimizing the body structure, updating the manufacturing and connection process of body parts, and replacing traditional low-strength steel with lightweight materials. High-strength steel has the advantages of high weight reduction potential, high collision absorption energy, high fatigue strength, high formability and low plane anisotropy, and aluminum alloy has the advantages of light weight, corrosion resistance, high specific strength, easy processing, beautiful surface and recycling cost low merit. Therefore, a large number of high-strength steels and aluminum alloys have been widely used in the ca...

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to solve the problem that in the prior art, when dissimilar metals such as steel and aluminum alloy are spot welded, due to the large difference in melting point and thermal expansion coefficient, hard and brittle metal compounds appear in the solder joints during welding, and it is difficult to achieve effective welded joints. The problem

[0005] The second purpose of the present invention is to solve the problem of difficult precise positioning between the punch and the pre-punched hole in the prior art

Images