To solve the key problem of caries, we must control the production of built-up edge
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The mechanism of causing built-up edge is more complicated, and there are many factors. It occurs randomly, causing the phenomenon of caries to be sometimes absent and irregular. To solve the caries problem, the key is to control the production of built-up edge. Heat treatment of workpiece materials Most of the gearboxes of automobile gears are helical gears. The material is made of 20CrMnTi carburized alloy steel. The hobbing front heat treatment is normalized. The hardness of the tooth blank is 156207HB. Due to the wide range of normalized hardness, the hardness of the tooth blank is only about 150HB. The plasticity and toughness are large, the metal deformation is large during the cutting process, the sticking knife is easy to stick, the friction coefficient of the chip and the rake face and the length of the contact zone are large, so the built-up edge is easy to occur. For this reason, the normalizing hardness is controlled between 170200HB, which improves the hardness and cutting performance of the tooth blank and reduces the possibility of generating built-up edge.
The hob was originally made of a 0b rake angle hob. In order to reduce chip deformation, friction and cutting force, a positive rake hob between 3b10b is now produced. Increasing the rake angle can effectively suppress the occurrence of built-up edge, or reduce the height of the built-up edge, and can make the cutting light and improve the processing quality of the hobbing surface. Note that if the front rake of the hob has a rake angle, the tooth profile pressure angle of the rolled out gear will change, resulting in a tooth profile error. However, as long as the tooth profile error is controlled within the range that can be corrected by the subsequent process (shaving, grinding), the rake angle can be selected as large as possible to prevent the formation of built-up edge. In addition, if the hob is blunt, the friction will be intensified and the built-up edge will easily occur, so the knife should be sharpened in time.
Cutting rate Cutting speed: It affects the built-up edge by cutting temperature and friction coefficient. When cutting metal materials at low and medium speeds, it is easy to produce built-up edge. When the cutting speed is v=20m/min and the cutting temperature is about 300e, the friction coefficient is the largest and the built-up edge reaches the maximum height. After the cutting speed is increased, the built-up edge height is lowered. The cutting speed range of processing general steel to form built-up edge is v=550m/min. The modulus of our gear is m=34.5mm, and the rolling speed is selected to be v=5570m/min.
