JPH0735008B2 - Method for correcting thermal deformation of machine tools - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for correcting thermal deformation of a machine tool.

BACKGROUND OF THE INVENTION Machine tools can undergo thermal deformation due to the ambient temperature in the workshop. When this thermal deformation occurs, it affects the machining accuracy of the machine tool.

Therefore, there has been a demand for the appearance of a machine tool capable of correcting this thermal deformation and performing accurate machining at any ambient temperature.

OBJECT OF THE INVENTION It is an object of the present invention to provide a method for correcting thermal deformation of a machine tool that can correct thermal deformation and increase machining accuracy.

Means for Solving the Problems The present invention provides a plurality of cooling means and heating means for compensating for deformation of a machine tool due to a change in ambient temperature of the machine tool on a bed, a column, a spindle head of the machine tool, and a temperature sensor. , The control unit connected to the cooling unit and the heating unit stores in advance the amount of deformation of a plurality of parts caused by changes in the ambient temperature, the ambient temperature of the machine tool is detected by the temperature sensor, and the stored content of the control unit Based on the value detected by the temperature sensor, a plurality of parts are cooled or heated by a cooling means or a heating means, each part is cooled and contracted to a predetermined size, and each part is heated and expanded to a predetermined size. The gist is a method for correcting thermal deformation of a machine tool, which is characterized by correcting deformation of the machine.

Example Referring to FIG.

Machine tools are bed 1, table 2, column 3, spindle head 4
And so on. The table 2 is set on the bed 1 and can be moved in the X-axis direction by the driving force of the motor 5.

The column 3 can be moved in the Y1 or Y2 direction by driving the motor 6.

The spindle head 4 can be moved up and down in the direction of arrow Z1 or Z2 by driving a motor 7 along the vertical direction of the column 3.

The spindle head 4 includes a tool holder 10 and a motor 11. The motor 11 is for rotating the tool holder 10.

A plurality of heating means 15 and cooling means 16 are arranged on the bed 1, the column 3 and the spindle head 4.

As shown in FIG. 2, each heating means 15 is connected to a heating source 17. An electric heater can be used as the heating means 15.

On the other hand, the cooling means 16 is connected to the cooling source 18. The cooling means 16 is configured to pass a gas as a cooling medium through a pipe, for example. This gas is supplied from the cooling source 18.

The machine tool shown in FIG. 1 has the control unit 20 and the temperature sensor 21 shown in FIG. When the temperature sensor 21 measures the room temperature of the workshop, the temperature is sent to the control unit 20. The control unit 20 controls the heating source 17 and the cooling source 18 according to changes in the ambient temperature inside the workshop.

When the ambient temperature is set in advance, the control unit 20 causes how much part of the machine tool causes thermal displacement, which part extends and which part shrinks, that is, how much it deforms. I remember that. When the ambient temperature of the workshop changes, the heating source 17 or the cooling source 18 is actuated according to the ambient temperature detected by the temperature sensor 21 based on the stored contents of the control unit 20 to cause thermal displacement. Heating means 15 or cooling means 15 corresponding to the part
Compensate for machine tool deformation by heating or cooling with. For example, when each part is stretched and deformed due to high ambient temperature, or when each part is contracted and deformed due to low ambient temperature, a predetermined part is cooled and contracted to a predetermined size, and a predetermined part is heated and predetermined. Extend to dimensions. Thereby, the deformation of the machine tool is entirely corrected.

By the way, the present invention is not limited to the above embodiment. For example, as the heating means 15, other than using an electric heater, one that guides exhaust heat of a motor used in a machine tool may be used. Further, the cooling means 16 may pass cooling oil through the pipe.

Effect of the Invention According to the present invention, even if thermal deformation occurs in a machine tool due to a change in ambient temperature, the correction can be performed. Therefore, the processing accuracy can be improved regardless of the ambient temperature.

[Brief description of drawings]

FIG. 1 is a side view showing a preferred embodiment of a thermal deformation correction method for a machine tool according to the present invention, and FIG. 2 is a heating means, a cooling means, a temperature sensor and a control section used in the machine tool shown in FIG. FIG. 15 …… Heating means 16 …… Cooling means

Claims (1)

[Claims] 1. A plurality of cooling means and heating means for correcting deformation of the machine tool due to changes in ambient temperature of the machine tool are provided on a bed, a column and a spindle head of the machine tool, and a temperature sensor, cooling means and heating means are provided. The amount of deformation of a plurality of parts that occurs in response to changes in ambient temperature is stored in advance in the control unit connected to, and the ambient temperature of the machine tool is detected by the temperature sensor, and based on the stored contents of the control unit, the temperature sensor Depending on the detected value, multiple parts are cooled or heated by cooling means or heating means, each part is cooled and contracted to a predetermined size, and each part is heated and extended to a predetermined size to correct the deformation of the machine tool. A method for correcting thermal deformation of a machine tool, which is characterized by the above.