Machining process for thin-wall cylindrical part with boss in inner hole

Abstract

The invention discloses a machining technology for a thin-wall cylindrical part with a boss in an inner hole. The machining process comprises the following steps: step 1, completing rough turning of the inner shape, rough turning of the outer shape and semi-turning of the outer circle datum of a pipe body on a common numerical control lathe; and step 2, selecting four-axis machining equipment with a rotary table or a dividing head, and wrapping the semi-turning outer circle part of the pipe body workpiece with a self-made special clamp. The machining process effectively solves the problems that: the two ends of the inner shape of a pipe body workpiece are subjected to multi-pass finish turning machining through a common numerical control lathe, due to the influence of multiple clamping errors and machining and clamping deformation factors,the machining precision is poor, scrap iron discharging is difficult, the cutting state is poor, a slotting machining face and a turning machining face do not coincide, and shutdown measurement, deviation value judgment, coordinate system center adjustment, program modification, relatively large machining allowance and a lot of time for roughly interpolating the allowance are caused by semi-finish machining allowance in actual machining.

Description

technical field [0001] The invention belongs to the technical field of machining, and in particular relates to a machining process of a thin-walled cylindrical part with a boss in an inner hole. Background technique [0002] The inner hole boss of the part is a common and important structure in mechanical design. The tube part is a thin-walled cylindrical part made of aluminum alloy. The inner shape structure is special and the precision is high. According to the comprehensive and multi-angle analysis of the drawing size, structural characteristics and processing route of the body part, it is found that the processing of the inner hole boss and the chamfering on both sides of the boss is the processing difficulty of the whole part; the original mechanical processing route is: Ordinary CNC lathe rough turning outer circle - rough turning inner hole at the left end - rough turning right end inner hole - semi-finishing outer circle - finishing turning left end inner hole - fini...

AI Technical Summary

Problems solved by technology

(Tube body) The parallelism of both end surfaces does not meet the requirement of 0.02mm; 2. The inner shape is difficult to remove iron chips when processed by ordinary CNC lathe, the cutting state is poor, and the surface roughness of the inner hole does not meet the requirement of 1.6; 3. Thin wall Cylindrical parts are affected by factors such as multiple clamping errors, machining deformation, and clamping deformation. When slotting the boss of the inner hole of the workpiece, there is a certain deviation between the center of the machining coordinate system and the actual center of the inner hole. As a result, the slotting processing surface does not coincide with the turning processing surface, resulting in overcut or residual

Therefore, in the actual machining, it is time-consuming and labor-intensive to follow the semi-finishing allowance, stop the measurement, judge the deviation, adjust the center of the coordinate system, modify the program, and repeat the above steps many times until the inner hole boss is processed into a finished product; 4. Turning When the final workpiece is directly slotted, the machining allowance is large, and it takes a lot of time to roughly insert the amount, resulting in a long overall slotting time and low slotting efficiency

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