When drilling workpieces in batches, some of the workpieces have only the main positioning reference, and the clamping is inconvenient. At this time, the profiling template can be clamped for complete positioning processing. According to the processing requirements and characteristics of the workpiece, when selecting the auxiliary positioning reference, it should be made according to the shape characteristics and positional dimensions of the workpiece. During positioning, the characteristic parts of the two are aligned and aligned so that the workpiece can be positioned with a coarse reference. The workpiece can be straightened without drawing a line, and directly processed by a fixture. The processing of the workpiece of the 480 diesel engine is as follows.
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