- Elastic deformation caused by external force effect
There are several reasons for the elastic deformation of CNC mechanical parts. One is that the internal structure of some parts is assumed to contain thin sections, which will have higher requirements for the process and operation. Otherwise, when the operator stops positioning and clamping the parts, it cannot correspond to the drawings, resulting in elastic deformation. The second is the uneven machine tool and fixture, so that the parts are fixed on both sides of the force is not even, resulting in cutting the force effect of the small side under the effect of the force will appear translation parts deformation. Third, the positioning of parts in the manufacturing process is not reasonable, so that the rigidity of parts is reduced. At last, the existence of cutting force is also one of the reasons for the elastic deformation of parts. These different reasons cause the total elastic deformation.
2. The Deformation after heat precessing
As for the mechanical parts of thin slices, they simply show a roundabout situation after the thermal disposal is stopped, when their very large diameter involves in. At one aspect, there will be a phenomenon of bulge in the middle, and the plane bias will increase. In other cases, the influence of various external elements will produce a roundabout phenomenon in parts. These deformation problems are not only caused by the changes in the internal stress of parts after heat treatment, but also by the poor knowledge of operators, who do not understand the structural stability of parts, and then increase the probability of parts deformation.
3. A Precision Fluctuation in Parts Processing Caused by Internal Power
Lathe processing normally involve the application of centripetal force effect, with the lathe of three or four jaw chuck, the parts clamping, and then stop processing of mechanical parts. At the same time, in order to ensure that the parts in the force is not loose, the effect of internal radial force will be receded. It is necessary to make the clamping force greater than the mechanical cutting force. The clamping force increases and decreases with the increase of cutting force. Such operation ability makes mechanical parts in the process of processing force stability. However, after the release of the three-claw or four-claw chuck, the machined parts will be far from the original, some polygon, some oval, showing a larger bias.
All the concerned reasons are listed above, explaining why parts are deformed. The mechanical processing function is not only connected to the interests of enterprises, but also related to safety; therefore economic benefits to enterprises and the less probability of accidents are both of great importance.