More body parts is the typical parts in mechanical parts
, such as the lathe headstock, gear box, gear case, etc. , is one of the basis of machine parts, it will be machines and parts of the spare parts such as shaft, bearing, gear sets and their correct position, and according to the preliminary design good transmission relationship between the mutual movement coordination, combined into a whole.
Body parts, after assembly datum plane with the design of casing is installed on the machine, so the processing quality of box body is various, not only affects the assembly precision and movement accuracy, and precision of the machine work, using performance and life has a decisive influence.
A, CNC lathe machining process route design housing requirements of the surface of a lot, such as lathe bed housing, gear boxes, etc in the processing surface, surface machining accuracy than hole machining accuracy easy to guarantee, so the spindle hole in the enclosure,
The machining accuracy, hole machining accuracy became a crucial problem for process, therefore, in the craft route arrangement I tend to pay attention to several points.
After the first plane hole machining order first plane, not only removed the blank surface becomes uneven and surface sand inclusion trapped, more important is in the processing and distribution in the plane hole, crossed, looking for is convenient, and when the boring cutter began to boring, will not impact vibration by end face has a rugged, damaged knives, therefore, generally should be best processing plane.
Rough and finish machining stage to separate enclosure structure is complex, mainly on the surface of the high accuracy requirement, CNC lathe, the rough machining processing cutting force, clamping force and cutting heat has a larger effect on machining accuracy, precision work immediately if rough machining, so after rough machining for various reasons caused by the internal stress of workpiece deformation is not fully released, cannot eliminate it in finish machining, which leads to casing deformation when processing finished unloading, affecting the precision of the box body eventually, I think in the process of rough machining, the best should be loose unloading fixture for many times, the internal stress is released in a timely manner as far as possible, the greater limit to guarantee the quality of housing.
CNC lathe machining process of centralized or decentralized decision housing rough and finish machining stage separately in accordance with the principle of procedure, but in the medium and small batch production, in order to reduce the number of used machine tools and fixture, and decrease the number of handling and installation for enclosure, rough and finish machining stage can be relatively concentrated, as far as possible on the same machine tools.
Arrange the proper heat treatment process of the casting housing complex structure, uneven thickness, cooling rate, casting is easy to produce internal stress and the surface is hard, therefore, should be reasonable arrangement of sandblasting, quenched and tempered after casting
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