Numerical control machine tool support plate heat error automatic compensation device

Abstract

The invention provides a numerical control machine tool support plate heat error automatic compensation device. A high-precision zero return sensor is fixedly arranged on a saddle through a first baseand positioned in a motion limit position of a support plate after the heat error generation; the support plate is fixedly provided with a contact in opposite installation to the high-precision zeroreturn sensor through a second base; when the support plate moves through the limit position to generate the heat error, the contact and the high-precision zero return sensor realize the mutual butt joint so as to trigger the high-precision zero return sensor to output effective electric signals to a tool controller of a numerical control machine tool connected with a tool setting device of an automatic tool setting instrument; and the heat error of the support plate is eliminated through tool compensation. The device has the advantages that the transformation is simple; and the cost is low. The device solves the technical problems that in the prior art, the design structure of a numerical control machine support plate heat error automatic compensation system is completed; the influence byelectromagnetic interference is great; the cost is high; the system software and hardware change is great; the system is not applicable to small-size processing centers; and the realization is not easy.

Description

technical field [0001] The invention belongs to the technical field of thermal error compensating devices for machining, and in particular relates to an automatic compensating device for thermal errors of pallets of numerically controlled machine tools. Background technique [0002] During the working process of the CNC machine tool, due to the heat generated by the friction of the spindle system bearing, the thermal drift of the spindle will occur. The frictional heat generated by the screw nut pair of the pallet feed system and the support bearings at both ends will cause the axial extension of the screw and the lead Increase, the nut seat will drift, and the entire bed body will also be heated and deformed, which will eventually lead to a change in the relative position of the workpiece and the tool, resulting in a thermal error. At present, most of the research on the online compensation system for eliminating thermal deformation errors focuses on installing multiple tem...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an automatic compensation device for the thermal error of the pallet of the CNC machine tool, by installing a high-precision zero-return sensor used as a zero-return switch on the bed saddle; when the thermal error of the pallet is installed on the pallet, the motion offset is generated After exceeding the limit position, touch the contact head with the high-precision zero return sensor; use the tool setting controller in the existing automatic tool setting instrument of the CNC machine tool to complete the tool compensation to eliminate the thermal error caused by the pallet; the transformation is simple; the cost Inexpensive; solve the complex design structure of the automatic compensation system for the thermal error of the CNC machine tool pallet in the existing technology; it is greatly affected by electromagnetic interference; the cost is high; the system software and hardware have undergone large changes;

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