In a word, the key to the machining skill of the fitting part is to select the appropriate offset, the suitable fit clearance and the sharp corner to be cleaned.

Steps for machining the fitting parts:

1. Standard parameter trial cutting

Cut a 10x10 punch with standard parameters and measure the dimension

If the offset used is 0.223, 0.164,0.134, 0.129, the measurement size is 10.01, and the unilateral dimension is larger than 0.005.

2. Adjust the offset and process the punch

The offset should be adjusted to 0.218, 0.159, 0.139, 0.124, then the size of punch machined according to this offset should be standard size 10.

3. Calculate the offset of processing die

The offset of punch is 0.218, 0.159, 0.139, 0.124, and the offset of female die should subtract the unilateral fit clearance. Generally, one side clearance of tight fit is 0.002, and that of sliding fit is 0.005. The fit clearance can be directly subtracted from the offset or entered at CLE .

4. Processing female die set

If the fit clearance is 0.005, the offset of die set is 0.213, 0.154, 0.134, 0.119.

5. Cooperation

When matching the punch into the female die, pay attention to the vertical placement of the workpiece. If the clearance is 0.005, the matching effect should be very smooth.