Heat treatment process for connecting rod

Abstract

The invention discloses a heat treatment process for a connecting rod and relates to the technical field of heat treatment for the connecting rod. The heat treatment process comprises the following steps: pre-circulating water in a cooling tank; setting heating temperature and heat preservation time for a quenching furnace, and machining a workpiece; taking out the workpiece, placing the workpieceinto the cooling tank, and driving the workpiece to vertically reciprocate at a constant speed through a supporting platform; controlling the quenching residual temperature, and after cooling the workpiece to room temperature, conducting hardness detection treatment; placing the workpiece into a tempering furnace for tempering treatment, and setting tempering temperature and heat preservation time; and carrying out hardness detection on the tempered workpiece. The workpiece is quenched and then subjected to tempering treatment, so that the mechanical properties of the workpiece are greatly improved, and the stability of the mechanical properties of the workpiece in the assembling and using process is improved.

Description

technical field [0001] The invention relates to the technical field of connecting rod heat treatment, in particular to a connecting rod heat treatment process. Background technique [0002] The connecting rod is one of the main transmission mechanisms of the automobile engine. It connects the piston and the crankshaft, and transmits the pressure of the expansion gas acting on the top of the piston to the crankshaft, so that the reciprocating linear motion of the piston can be reversibly converted into the rotary motion of the crankshaft to output Power; heat treatment refers to a metal thermal processing process in which the chemical composition and structure of the surface or interior of the material are changed by means of heating, heat preservation and cooling in the solid state to obtain the required properties. [0003] A CN105648179A patent is disclosed in the prior art, and the scheme includes the following steps: blanking—forging—preliminary heat treatment—rough mach...

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Problems solved by technology

[0009] Aiming at the defects in the prior art, the present invention provides a connecting rod heat treatment process, which is used to solve the problem of prolonging the water circulation time, prolonging the heat treatment processing time and reducing the heat treatment efficiency due to the low water circulation efficiency inside the furnace body in the traditional technology; During the moving process, the movement at a uniform speed cannot be guaranteed, which affects the heat treatment accuracy; and due to the limitation of the support platform, the surface of the workpiece cannot be uniformly and fully contacted with water, which causes the problem of stress concentration during the quenching process , the problem that affects the mechanical properties of the workpiece in later use

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