Control method for thermal deformation compensation of ram of numerical control machine and device for implementing same

Abstract

The invention relates to a control method for the thermal deformation compensation of a ram of a numerical control machine and a device for implementing the same, which mainly solve the problem of machining error caused by flexible deformation due to the change of the ram of the numerical control machine with the change of temperature. The control method is characterized in that: a micrometric displacement detection device which has low thermal expansivity and is fixed on the ram is adopted, and one end of a displacement reference measuring rod in the micrometric displacement detection device extends freely and forms a thermal displacement measuring factor with a micrometric displacement sensor; a thermal deformation flexible signal, which is detected by the micrometric displacement detection device, of the ram is processed and converted by an embedded compensator to form two paths of orthogonal pulse signals; the orthogonal pulse signals are generated by a method of controlling a quarter of the period of the signals, and is inputted to a numerical control system by a hand-held unit interface of the numerical control machine; and the system performs real-time compensation by calling a fine motion differential analyzing function. After the control method is used, the machining error caused by thermal deformation in the ram of the numerical control machine can be reduced greatly, so the control method has the excellent economic and social benefit.

Description

technical field [0001] The present invention relates to a dynamic error compensation control method used on numerically controlled machine tools in the field of mechanical processing, in particular, to a control method used to compensate thermal deformation of rams on numerically controlled machine tools and the method for implementing the method Specially designed devices. Background technique [0002] During the operation of the machine tool, the temperature of the components changes due to factors such as frictional heat, cutting heat, and ambient temperature, resulting in thermal deformation, which directly leads to changes in the relative positions of the components and destroys the correctness of their relative motion. Sexuality, eventually forcing the machining accuracy of the machine tool to be reduced. Research shows that: in precision machining, the machining error caused by thermal deformation accounts for 40-70% of the total machining error. Especially for heav...

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Problems solved by technology

However, for heavy-duty machine tools, since the cooling jacket device is difficult to control the expansion and contraction of the ram, the deviation problem cannot be completely solved, and it takes a long time to warm up to the thermal steady state

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