Various engine factories at home and abroad have used CNC follow-up grinding machines to complete the processing of cams, and the follow-up grinding machines have completely replaced the eccentric fixture grinding in the past. The follow-up grinder can not only realize the different rotational speeds required for rough and fine grinding, but also automatically change the speed at different curve segments of the cam / crankshaft swing, so as to ensure that the grinding force and grinding amount of each grinding point on the profile are consistent. The flexibility, efficiency and accuracy of the grinder are greatly increased. For example, the error of the cam profile is increased from 0.015mm (double copying) to 0.007mm.
CNC follow-up grinding machines have been widely used. The grinding process design of cams can be solved by equipment suppliers. There are many advanced equipment manufacturers of grinding machines, such as Germany Yongke company, Schott, Landis company, Japan Toyota Industrial Machinery Company (Jtekt) and Japan NTC company.
The selection of the follow-up grinder shall be confirmed with the equipment supplier. According to the 0-360 ° discrete points of the cam provided, the three-dimensional data conversion and measurement monitoring system shall be used to change the discrete points into continuous closed curves and convert the generated curves into grinding curves.
If there are concave cams (also known as “negative radius of curvature (nroc) cams”) on the camshaft, double grinding head cam grinding machines (i.e. with b-axis grinding machines) or two single grinding head cam grinding machines with different sizes of grinding wheels can be selected. The double grinding head grinder can be clamped at one time to process the cam surface, with high accuracy and efficiency, and only the cost of hardware and software control of one grinding head is increased (the cost of a single grinding head of the European grinding machine is about 250000-300000 euros), with good economy.