Mechanical processing plant processing tips and the cause of the error
Mechanical parts processing industry is the pillar industry of the national economy, which has a very considerable prospect. In the machinery processing plant processing precision machinery parts, there will be many requirements and regulations for the processing process, with the qualified rate of the factory parts.
Remove the pliers, process two M4 threaded holes, tighten two steel plates 1.5mm thick, and vet 0.8mm thick hard brass plate 3 to the pliers with M4 sunk screw 1 to form a durable soft jaw. This can also protect the hardware parts from being broken, but also have interchangeability.
For a workpiece first clamping and then positioning, because the clamping will certainly be a test piece deformation, so, should first clamping and then positioning, for 6 point positioning, find to limit its degree of freedom. When the hexagon wrench handle is short, can not focus, the inner diameter of a little larger than the wrench to insert the wrench into the groove, can be used as a long handle.
In the process of mechanical manufacturing, the error mainly includes the spindle rotation error, guide rail error and transmission chain error. Spindle rotation error refers to the change of the actual rotation axis in each moment of the spindle relative to its average rotation axis, which will directly affect the accuracy of the processed workpiece.
The main reasons of spindle rotation error are coaxial error, error of bearing itself, coaxial error between bearings, spindle winding, etc. Guide rail is the reference to determine the relative position relationship of each machine tool component on the machine tool, and also the reference of machine tool movement.
The manufacturing error of the rail itself, the uneven wear of the rail and the installation quality are the important factors causing the error. Transmission chain error refers to the error of the relative movement between the transmission elements at the beginning and end of the transmission chain. It is caused by the manufacturing and assembly error of each component of the transmission chain, as well as the wear in the use process.
The experience of the mechanical processing plant points out that any tool will inevitably produce wear during cutting, and thus change the size and shape of the workpiece. The influence of tool geometry error on machining error varies with the type of tool, the tool manufacturing error directly affects the machining accuracy of the workpiece; for general tools, the manufacturing error has no direct effect on machining error.
The role of the fixture is to make the workpiece equivalent to the tool and the machine tool have the correct position, so the geometric error of the fixture has a great impact on the machining error (especially the position error). The thermal deformation of the process system has a large impact on the processing error, especially in the precision processing and large piece processing, the processing error caused by the thermal deformation can sometimes account for 50% of the total error of the workpiece.
