Punching Die and Its Forming Process of Non-Quenching and Tempering Limiting Pin

Abstract

The invention provides a trimming die of a free-tempering limiting pin and a forming process of the trimming die and belongs to the technical field of limiting pin machining. Problems that the existing limiting pin is high in machining cost, raw materials and tool dies are wasted in a machining process and the like are solved. The trimming die of the free-tempering limiting pin comprises a chamfering die and a trimming die body, the chamfering die is that a die core totally made of tungsten steel is arranged in a die seat, thimble sliding channels which are mutually communicated are arranged in the die core and the die seat, and thimbles for glidingly pushing a die blank out are arranged in the sliding channels. The trimming die body is that the die core totally made of tungsten steel, a spring and a punching pad are sequentially arranged in a sliding channel of a cavity of the die seat, a limiting pin forming groove is arranged on the die core, one end of a punching rod is connected with the punching pad, the other end of the punching rod extends into a die core forming groove, and the forming groove comprises a big diameter portion on the upper portion and a small diameter portion on the lower portion. The trimming die has the advantages of saving machining cost of the limiting pin, simultaneously reducing quality risk caused by tempering machining, improving quality of products and the like.

Description

technical field [0001] The invention belongs to the technical field of limit pin processing, in particular to a quenching and tempering free limit pin die and its forming process. Background technique [0002] At present, the limit pin products used on the driven disc of the automobile clutch have the following requirements in riveting: the hardness requirements at both ends of the limit pin are low, which can facilitate riveting; the middle part of the limit pin has high hardness requirements, which can transmit the driven Enough torque for the disc to rotate, and at the same time start to stop. Based on the above two requirements for limit pins, many limit pin products have been derived: such as high-strength limit pins that require quenching and tempering treatment (such as high-frequency quenching) in the middle, and drilling or punching at both ends. Handled double-hole limit pins, etc. The processing technology of these traditional limit pins is relatively simple, an...

Images