CNC machine tool detection device

The detection device we are talking about here refers to a position detection device used on a numerical control machine tool. They are usually installed on the workbench or screw of the machine tool, which is equivalent to the dial of the ordinary machine tool and the eyes of the person. The displacement of the worktable is continuously detected and fed back to the control system. A large number of facts prove that for a well-designed high-precision CNC machine tool, its machining accuracy and positioning accuracy will mainly depend on the detection device. Therefore, the precision detection device is an important guarantee for high-precision CNC machine tools. In general, the detection devices used on CNC machine tools should meet the following requirements:

(1) Reliable work and strong anti-interference.
(2) It can meet the requirements of precision and speed.
(3) Easy to use and maintain, suitable for the working environment of the machine tool.
(4) Low cost.

In general, the detection accuracy of the detection device is 0.001~0.01mm/m, and the resolution is 0.001~0.01mm/m, which can meet the requirements of the machine tool table to move at a speed of 1~10m/min.

Table 4-1 is a detection device that is currently used on CNC machine tools. This chapter introduces some of the commonly used ones.

Table 4-1 Classification of Position Detection Devices

Digital

Analog

Incremental

Absolute

Incremental

Absolute

Rotary line

Circular grating

Code disk

Resolver, Circular Induction Synchronizer, Circular Magnetic Enclosure

Multipole rotary transformer

Straight line

Long grating

Laser Interferometer

Code ruler

Linear induction synchronizer, magnetic grid, capacitive grid

Absolute magnetic ruler

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