1. Analysis of part drawings

1) The coaxiality tolerance of the outer circle to reference A is ± 0.05mm;

2) The parallelism tolerance of the right end facing the reference plane B is 0.05mm;

3) The roundness tolerance of the outer surface is 0.01mm;

4) The roundness tolerance of the inner surface is 0.01mm;

5) Normalized 190-207HBS;

6) Material QT600-3

2. Cylinder liner machining process card

3. Process analysis

1) The cylinder liner belongs to thin-walled parts. Due to the poor rigidity of thin-walled workpieces, they are prone to deformation during the turning process due to cutting and clamping forces, which affects the dimensional and shape accuracy of the workpiece. Therefore, reasonable selection of clamping, tool angle, cutting amount, and cutting cooling lubrication are all key factors to ensure the machining of thin-walled parts;

2) The accuracy of the inner and outer circles of the parts is relatively high, and rough and fine machining should be separated during processing;

3) When the cylinder liner is finally used, it is pressed into the cylinder block and the inner diameter size is machined again. The end of the cylinder liner with a diameter of 300 (+0.04/0) * 5mm plays a positioning and guiding role during pressing.

Explanation:

1. Due to the inability to indicate upper and lower tolerances and import process cards in the document, some parts are in image format;

2. The writing of process cards is not unique. Taking ordinary machining machines as an example, I hope it can be helpful.