Precise thermal machining method for an engine piston connecting rod

Abstract

The invention discloses a precise thermal machining method for an engine piston connecting rod, and belongs to the technical field of metal material plastic machining. The method comprises the following steps that S101, a round blank is heated; S102, a precise pre-forming combination process is adopted, wherein a local upsetting process is adopted at first, a box-type variable-cross-section hole type transverse rolling forming process is adopted secondly, and thirdly, flattening and forming is carried out on the rolled blanks in a flattening mode so as to obtain a precisely-blocked extruded blank; and S103, reunion blocking and precise extrusion forming are carried out. According to the precise thermal machining method, the precise pre-forming combination process is adopted, and the process comprises the local upsetting process, the box-type variable-cross-section hole type transverse rolling forming process and a flattening and blocking precision extrusion forming process, so that precise hot working forming of the engine piston connecting rod is realized, the strength and the rigidity of the engine piston connecting rod meet the use requirements, wherein the sizes of a small head, the size of a rod body and the size of a large head of the engine piston connecting rod are close to the size of a finished product, the utilization rate of the material reaches more than 98%, and compared with an existing open type die forging, the material utilization rate is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of plastic processing of metal materials, and more specifically relates to a precision thermal processing method for an engine piston connecting rod. Background technique [0002] The engine piston and connecting rod are the core components of the automobile engine and belong to the bearing parts of the shaft. The function of the engine piston connecting rod is to connect the piston and the crankshaft, convert the reciprocating motion of the piston into the rotational motion of the crankshaft, and transmit the force borne by the piston to the crankshaft. The engine piston connecting rod is generally composed of three parts: the small head, the rod body and the big head, such as figure 1 As shown, the small end of the connecting rod is connected with the piston pin, and there is relative movement between the pin and the pin during operation. There is a bushing in the hole of the small head, and a small hole ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that in the prior art hot die forging method, roll forging, cross wedge rolling or roll drawing is used for preforming, and open die forging is used for final forging, resulting in low material utilization rate, the invention provides a precision hot die forging engine piston connecting rod. Processing method, which adopts new forming methods and means in the preforming and final forging forming processes, improves material utilization, realizes precision plastic forming processing of connecting rods, and improves the quality of connecting rod products

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