Precision parts machining process content and steps

So do you know how the content and steps of precision parts machining process?

1, to determine the machining sequence of parts

Processing order should be based on the type of blank, structure, size, machining accuracy, surface roughness and heat treatment and other technical requirements to determine.

2, to determine the amount of cutting used and the quota of working hours

Single piece of small batch production of the cutting amount is generally selected by the producers themselves, the working hours quota developed by the management.

3, to determine the type of blank

The type of blank should be based on the material, shape and size of the parts to determine, but also consider the workpiece batch and production conditions. As shown in the transmission shaft, small diameter, the diameter of the segments of the outer diameter of the disparity is not large, you can choose round steel under the material. Gear shaft shown in the figure, the diameter difference is large, in order to save materials and processing time, if the batch is large, and with forging conditions, should be selected forging blanks; otherwise, also selected round steel material. Bearing cover, the material is cast iron, the blank should be selected castings. Gear, its material is 40 steel, and the diameter of the outer circle is not large, small outer circle short, can choose round steel material. Gear, because of its diameter of the outer circle and hole are large, a single piece can choose the corresponding thickness of the steel plate gas cutting material, batch size can be selected forging, forging into a circular billet, which saves material, but also reduces the processing time, forging blanks of mechanical properties or good.

4, to determine the processing procedures

Determine the process used in the machine tool, workpiece clamping methods, processing methods, machining dimensions and testing methods, including for the next process plus the margin left. General small and medium-sized parts outside, inside the cylinder and the plane are referred to as a single side of the allowance, in a single piece of small batch production, the blank size of the fire value, and vice versa, take a small value. Total allowance: hand-molded castings for 3-6mm; free forging or gas cutting parts for 3-7mm; round steel material for 1.5 ~ 2.5mm. process allowance: semi-finish turning for 0.8 ~ 1.5mm; finish turning for 0.4-0.5mm.

5, fill in the process card

With a brief description and process sketches show the above.