Characteristics of precision parts processing technology for set parts
In the processing of precision parts, shaft sleeves, sleeves and other parts are generally called sleeve parts.
Sleeve parts are generally composed of outer circle, inner hole, end face, step, inner groove and other structural elements.
Its main feature is that the shape accuracy and position accuracy between the inner and outer cylindrical surfaces are required to be high.
Next, let the senior operator of NJPE precision parts processing factory explain the processing technology and process characteristics of set parts NJPE precision parts processing factory the processing technology characteristics of set parts the set parts are mainly supported in the machine. and guiding role, generally, it is mainly composed of inner and outer surfaces with higher coaxial requirements.
The main technical requirements of general set parts are as follows :(1)
Dimensional accuracy, surface roughness and roundness requirements of inner hole and outer circle. (2)The coaxial degree between the inner and outer circles is required. (3)Verticality requirements of hole axis and end face.
Thin-walled sleeve parts are very thin in wall thickness and weak in radial stiffness. They are easily deformed under the influence of cutting force, cutting heat, clamping force and other factors in the machining process, resulting in difficulty in ensuring the above technical requirements.
During clamping, corresponding preventive and corrective measures must be taken to avoid deformation of workpieces during processing;
Or due to clamping deformation and deformation recovery after processing, the machined surface is deformed, and the machining accuracy cannot meet the technical requirements of parts drawings. 2. Principles of processing technology for sleeve parts (1)Rough machining and precision parts machining shall be carried out separately. (2)
Axial compression should be adopted as far as possible. If radial clamping is adopted, the radial clamping force should be evenly distributed. (3)
The heat treatment process shall be arranged between rough and finish machining. (4)
The inner and outer round surfaces and end faces of small and medium-sized sleeve parts shall be processed as far as possible in one installation. (5)
When arranging the processing sequence of the hole and the outer circle, the processing sequence of processing the inner hole first and then positioning the outer circle with the inner hole should be adopted as far as possible. (6)
When turning thin-walled sleeve parts, the turning tool should choose a larger main deflection angle to reduce the back force and prevent deformation of the machined workpiece. 3.
Blank selection the blank of set parts is mainly selected according to the material, shape, structure, size and production batch.
When the aperture is small, Bar material can be selected or solid casting can be used;
When the aperture is large, castings and forgings with prefabricated holes can be selected; When the wall thickness is small and uniform, the pipe material can be selected;
When the production batch is large, advanced blank manufacturing technologies such as extrusion and powder metallurgy can also be adopted, which can improve the processing and production efficiency of precision parts and save materials on the basis of improving blank precision.
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