Figure 1: This graph was generated using thermal modeling software for camshaft grinding. The figure shows the location where the circumference of the lobe may be thermally damaged during the grinding process.
The other graph shows the temperature distribution by the relationship between the camshaft rotation (unit: degree) and the surface depth. This figure shows what depth the various temperatures reach at a particular point on the circumference of the lobes (Figure 2 shows an example of such a figure when the camshaft makes one revolution).
Figure 2: This figure shows the heat generated by the grinding wheel when it is cut on the lobes, the depth reached, and the lobed surface at a specific point on the circumference of the lobes.
Typically, the entire grinding cycle is drawn for analysis, including roughing and finishing (software can make models with camshafts up to 20 turns). The baseline data indicates what temperature level and penetration depth should be maintained during the process, depending on the material of the camshaft. After evaluating the heat and penetration depth, the parameters can be adjusted and the fine grinding cycle determined to ensure that any previous thermal damage layers are removed.
For camshafts with a concave profile, the two grinding cycles will be modeled. One model will be for roughing the entire lobe shape with a large diameter grinding wheel and the other for finishing and grinding the concave contour with a small diameter (typically 80% of the concave diameter) grinding wheel. In order to complete both the roughing and the finishing process on a grinding machine, a machine with a counterspindle using a small grinding wheel is required.
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