Motor Frame Processing Key Process Analysis And Control Research

In recent years, the demand for middle and small motors shows a rising trend in chinaand abroad markets, also the quality performance of motor frame is required higher andhigher. In motor structure motor frame is the most important part that has influence on sizeand uniformity of motor air gap. How to Control coaxiality error among two face spigots,iron core retaining and axis line of motor frame is one of the key problems of technologyupgrade which are urgent need in domestic motor industry. Motor frame belongs tothin-wall parts, with complex structure, high form and position accuracy, and large batchproduction. Due to the reference of processing being not unified and the fit clearancebetween motor frame spigots and their pins, overproof of coaxiality constantly turns up,which causes difficulties for frame to reach the requirements of motor quality andassembly, moreover effects motor performance and working stability. Based on both thestatus of technical improvement of machining technology equipment on domestic andinternational and the research situation of thin-wall parts, the technological method forreducing the coaxiality error in the key process of motor frame processing was proposed inthe paper, abiding by the reference unification of processing. Under different cuttingcondition, the influence on spigot machining error coming from frame rotation modal andcutting force was analyzed at a certain depth by finite element analysis software, whichfollowing the principle of reducing error:1. The traditional machining technology of motor frame was analyzed to obtain themain keys that causing the coaxiality error. The principle for the coaxiality error wasparsed and the feasibility was researched on the radial circle run-out error substituting forthe coaxiality error.2. The cutting force in the vertical turning of frame spigot finishing machining wasmeasured. The empirical formula of cutting force in horizontal type cylindrical turning wasverified that is feasible to vertical inner hole turning. The payload value of cutting force inspigot machining was discussed under different conditions.3. ANSYS was used to analysis the intrinsic mode of the frame under rotating state,and the basis clamping scheme of the frame in roughing and fine machining was discussed.Furthermore, by analyzing the transient dynamic characteristics of frame in machining, thedistortion and force of frame was obtained under different clamping scheme conditions.The concrete clamping scheme of frame was determined so as to reduce the radial circlerun-out error, and to increase the coaxiality error as well.4. Based on the analysis results, a new tooling structure was preliminary designed for YB225-s explosion-proof motor frame.This research has certain value and practical significance to the mechanical machiningprocess planning, tooling structure design and production practice of motor frameprocessing. In addition, it is of important reference significance for improvingmanufacturing quality of motor, having optimizational interchangeability of motor partsand making processing cost lower.