Machining process of engine crankshafts in heavy trucks

A processing technology and engine technology, applied in the direction of metal processing equipment, etc., can solve the problems affecting the life of the crankshaft and the reliability of the whole machine, and achieve the effect of small deformation, high quality and high tensile strength

Inactive Publication Date: 2013-12-18
ZHEJIANG WEILIN MECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the conditions of mass production, the traditional technology can no longer meet the current design and production needs. Under long-term and high-speed operation, the crankshaft is prone to premature failure or fracture, which seriously affects the life of the crankshaft and the reliability of the whole machine.

Method used

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  • Machining process of engine crankshafts in heavy trucks
  • Machining process of engine crankshafts in heavy trucks

Examples

Experimental program
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Effect test

Embodiment

[0042] 1) For blanking, select a steel bar with a metal grade of 40Cr. According to the crankshaft model, select Φ120mm raw steel for sawing. The length of the blank blank is 1000mm, which is consistent with the forging process regulations. Use a caliper and a tape measure to check the size of the material and visually inspect the saw edge. The slope is not more than 2°, and the burr is not more than 2mm.

[0043] 2) Forging, put the billet into the bending die chamber of the hammer forging die for bending, hit a hammer, then turn over 270°, put the billet into the bending die chamber of the hammer forging die, and control the bending temperature At 1230±25°C, put the bent billet into the pre-forging die chamber of the hammer forging die for pre-forging; then place the pre-forging billet in the final forging die chamber of the hammer forging die for final forging, and continue in the final forging Use compressed air to clean the oxide skin in the final forging die cavity. The ...

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Abstract

The invention discloses a machining process of engine crankshafts in heavy trucks. The process includes the steps of blanking, forging, shot blasting, rough turning, numerical control correction, rough grinding, drilling, enhanced surface treatment, accurate grinding, dynamic balancing, finishing and the like. Metal bar blanks are bent and forged in a forging hammer die; forging blanks are subjected to surface grinding and shot blasting prior to machining and enhanced surface treatment; finally, finishing, grinding and final inspection are performed. The machining process has the advantages that the produced crankshafts in compact in structure, fine in metal streamline, high in tensile strength, fatigue strength and hardenability; little deformation occurs during enhanced treatment; creeping strength at high temperature is high; product qualification rate and product quality are high; the process is available for large-scale production, and productivity is improved greatly.

Description

technical field [0001] The invention relates to a crankshaft processing technology, in particular to a processing technology for a heavy truck engine crankshaft. Background technique [0002] The crankshaft is an important part of the engine. Its material is made of carbon structural steel or ductile iron. It has two important parts: the main journal and the connecting rod journal. The main journal is installed on the cylinder block, the connecting rod journal is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, which is a typical slider crank mechanism. [0003] As an important moving part, the engine crankshaft has high design requirements. At the same time, due to the extremely harsh working conditions of the crankshaft, the requirements for crankshaft material, crankshaft dimensional accuracy, surface roughness, heat treatment and surface strengthening, and dynamic balance are very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14B21J5/06
Inventor 林素伟
Owner ZHEJIANG WEILIN MECHANICAL
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