Structural analysis of parts, structural mechanical manufacturing of precision instrument horizontal axis and structural process analysis of automated parts
a) Process analysis of part shape. From the processing point of view, the part is made of 38CrMoAlA alloy structural steel, the material itself has higher strength and less deformation. The parts need to be quenched and tempered, and the outer circle
The nitriding treatment is also required, and the final fine grinding and grinding of the grinding is required to achieve a roundness of 0.001 mm, and the clearance is less than 0.001 0. 004 mm, roughness Ra0. The shape and structure of the parts can meet the technical requirements of the design.
b) Process analysis of the internal structure of the part. The machining of the square cavity of the part is difficult. Deep 88, the rounded corners around it are R5, to ensure the square cavity side of the U, N outer circle axis center symmetry 0. 015, parallelism 0.02 requirements, for gold processing, it is very difficult. Because of the rough processing of gold processing, the quenching and tempering, the hardness reaches HRC24 28, and then the outer circle is positioned, and the special cavity is used for clamping and milling the inner cavity to ensure the symmetry and parallelism requirements. However, since the depth of the highest point in the bottom of the inner cavity is 88mm, to ensure the clear angle around R5, it is necessary to use an extended milling cutter with a length of D 10 greater than 100. Because the shape of the cutter is required to be slender, the diameter to length ratio is large, and the parts are adjusted. The hardness after the mass is higher, and the tool generates a large force during the machining, which causes the tool to have radial drift during the whole process (Fig. 2), so that the surrounding side walls are horned after processing, and vertically in the actual processing. The deviation can reach 0. 7mm, and the geometrical tolerance requirements of the side and bottom surfaces of the square cavity and the journals U and N at both ends are not guaranteed at all. Therefore, from the technical point of view, the structural design of the part has large structural defects.
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