QUANZHOU YISHENG MACHINERY CO.,LTD Automechanika
The engine is the core part of the motorcycle, and the camshaft is a key component in the piston engine. It bears a lot of friction during work, and its function is to control the opening and closing of the valve. Therefore, the camshaft is designed to be strong at the beginning. And it has high requirements in terms of wear resistance. In actual production, the scrap rate of camshafts is relatively high, and the scrapped camshafts due to cracking account for about 70%. So we conducted a comprehensive analysis on this aspect.
By analyzing the crack shape, the crack is basically Curved or linear transcrystalline cracks are obvious quenching cracks. According to the characteristics of induction heating, there are three factors leading to the formation of quenching cracks:
A. The improper design of the quenching inductor causes uneven quenching heating, local overheating, and cracks during the rapid cooling process of the spray liquid. ;
B, material defects;
C, improper selection of process parameters and coolant.
Original parameters: anode voltage 10500 volts, heating time 7.8 seconds, water cooling time 6.5 seconds, quenching solution concentration 3 % Through the adjustment of the process parameters of the camshaft quenching, the control of the pearlite content and shape in the raw materials, and the rectification of the heating inductors, the problem of the camshaft quenching cracking has been well solved, and the final camshaft scrap rate has changed from the previous The 4.9% of the product has dropped to 2%, and the scrap rate has been reduced by 2.9%.
Unreasonable sensor design, material defects, and reasonable matching of process parameters are all causes of quenching and cracking of the camshaft surface. Effective Measures to reduce the number of cracks, the camshaft is well controlled.
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