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How to improve the machining precision and machining efficiency for CNC machining
Jul 26, 2018

Under the condition of rigidity to allow, rough machining to take larger cutting depth, to reduce the number of feeding, improve the productivity; Finishing generally take a small cutting depth, in order to obtain high surface quality. The influencing factors of workpiece machining precision and machining efficiency, in addition to the CNC machine's own reason, also should set reasonable processing route, cutting tool selection and correct installation, the reasonable choice of cutting quantity, programming skills and size precision of the rapid control several aspects such as comprehensive consideration.

Programming Skills

CNC programming work is the basis of a numerical control processing, workpiece processing program compiled by the fit and unfit quality directly influence the machining precision and machining efficiency of machine tool eventually. From the clever use of inherent program, reduce the cumulative error of CNC system, flexible use of main program and subroutine and so on several aspects.

Adjust the process system

Reduce machine tool error

Reduce the transmission chain transmission error

Reduce tool wear

Reduce the deformation of the process system

Reduce the thermal deformation of the process system

Reduce residual stress


Reasonable set up processing route

In the numerical control milling, requires a combination of artifacts manufacturability requirements to choose the right means of feed, to ensure that the workpiece machining precision and machining efficiency. When performing CNC milling of workpieces, it is necessary to select the appropriate feeding method in combination with the process requirements of the workpiece to ensure the cutting precision and machining efficiency of the workpiece. When milling the outer contour of the part, the cutting and cutting path of the tool should be arranged. Try to cut in and out along the extension of the contour curve to avoid knife marks at the junction. At the same time, in milling, whether down milling or up milling should be selected according to the workpiece.


Cutting tool selection and properly installed

For CNC machining or general machining, the tool is directly applied to the workpiece, so it is the most important factor in the selection and surface quality of the workpiece during installation. In particular, the workpiece is machined on a CNC machining center, and the tool is stored in the tool magazine beforehand. Once the machining is started, it cannot be replaced at will. Therefore, the general principle of tool selection is: easy installation and adjustment, good rigidity, durability and high precision.


The rational selection of cutting parameter

The determination of the cutting amount is an important part of the CNC machining process. Its size is an important parameter of the main motion and feed motion of the machine tool, which has an important influence on the machining accuracy, machining efficiency and tool wear of the workpiece. The choice of cutting amount includes cutting speed, back-feeding amount and feed rate. The basic selection principle is: roughing takes a larger depth of cut to reduce the number of passes and increase the productivity of the workpiece; the finishing generally takes a smaller depth of cut to obtain a higher surface quality.