JPH06155230A - Temperature control device of spindle head - Google Patents

Abstract

PURPOSE:To provide a temperature control device of a spindle head which is newly improved so as to minimize thermal displacement of a spindle. CONSTITUTION:In the temperature control device of a spindle head provided with an oil cooler 4 cooling lubricating oil O1 supplied to a spindle head 2 and a heater heating the lubricating oil, when a spindle is stopped or rotated at low speed, while stopping the oil cooler 4 to function, the heater H is controlled to heat by means of a controller 6, and when the spindle is rotated at middle or high speed, while stopping the heater H to heat, the oil cooler 4 is controlled to function, so as to precisely hold the totally heated temperature of the spindle at a prescribed value T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new and improved technique for a spindle head temperature control device.

[0002]

2. Description of the Related Art Conventionally, it is known that the spindle of a machine tool generates heat and thermally expands in proportion to the rotational speed of the spindle. Therefore, there is provided a circulation cooling system in which the spindle cooling oil is put into the spindle head, or the spindle cooling oil is cooled to a predetermined temperature by an external cooling machine (oil controller) and then supplied again into the spindle head. Since the external cooler (oil control) continues to operate and cools the cooling oil even when the spindle is stopped, a large thermal displacement is generated as the temperature rises from the restart of operation to the saturation of the spindle temperature. . This is the same at the beginning of work in the morning.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 60-167745, there is provided a spindle head temperature control device provided with an oil cooler for cooling the lubricating oil supplied to the spindle head and a heater for heating the lubricating oil. There is. As a result, the spindle stabilization time at the beginning of work in the morning can be shortened, and the spindle temperature can be accurately controlled. However, in the spindle head temperature control device, the oil cooler and the heater are operated according to the temperature detection value of the spindle head regardless of the rotation speed of the spindle that is the heat source, so that the polygonal line shown in FIG. As described above, a large temperature fluctuation is generated around the set temperature T _{0 at} which the spindle temperature saturates.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel spindle head temperature control device which is an improvement of the spindle head temperature control device in order to solve the above-mentioned conventional problems. To do.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a spindle head temperature control device including an oil cooler for cooling lubricating oil supplied to the spindle head and a heater for heating the lubricating oil. The controller controls the heat generation of the heater while stopping the oil cooler during rotation, and controls the operation of the oil cooler which cuts off the heat generation of the heater during the middle / high speed rotation of the spindle, maintaining the total heat generation temperature of the spindle at a specified value. It is a characteristic spindle head temperature control device.

The function of the spindle head temperature control device of the present invention is to rapidly raise the oil temperature by stopping the oil cooler and controlling the heat generation of the heater when the spindle is stopped or at low speed rotation. Then, when the spindle is rotating at high speed, the heater is turned off to cool the spindle head, which is heated by the operation control of the oil cooler, and the spindle temperature is set at a set temperature at which the spindle temperature saturates to minimize the thermal displacement of the spindle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The temperature control device for a spindle head according to the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram of a temperature control device for a spindle head according to the present invention, and FIG. 2 is an operation control characteristic diagram of a heater and an oil cooler.

In FIG. 1, reference numeral 1 is a machine tool column, and 2 is a machine tool column.
Is a spindle head, 3 is a spindle, and is provided with an oil cooler (oil controller) 4 for cooling the lubricating oil O1 supplied to the spindle head 2 through a pipe P1, and a heater H for heating the lubricating oil O1. The spindle head temperature control device 100 is provided for returning the lubricating oil O2 returning from the head 2 to the oil cooler (oil controller) 4 through the pipe P2. The heater H
Is connected to a controller 6 that adjusts the heating control voltage V according to the spindle rotation signal (a) from the spindle rotation detector 5, and this controller 6 returns the lubricating oil O from the spindle head 2.
2 is dominated by the thermistor TH3. The heater H is controlled by the speed switching device 10 so that the heater H heats when the spindle is stopped and rotates at low speed A1, and stops at the section A2 in the medium to high speed range. Further, the spindle rotation signal (b) from the speed switching device 10 causes the spindle ON / OF.
When the main shaft rotates, the F switch 8 operates to switch the thermistor TH2 to the body tuning and control the operation of the oil cooler 4. When the spindle rotation signal (b) from the speed switching device 10 disappears, the spindle ON / OFF switching device 8 operates and the thermistor T
Separate H2 from body tuning.

The spindle temperature control device 100 of the present invention is constructed as described above, and the controller 6 stops the oil cooler and turns on the heater H when the spindle is stopped or at low speed A1: as shown in FIG. By generating heat, the lubricating oil O1
The temperature of the spindle head rises rapidly and the spindle head is set to the set temperature T ₀
To control. Further, in the section A2 from the middle speed to the high speed range due to the increase of the spindle rotation, the spindle ON / OFF switching device 8 is activated by the spindle rotation signal (b) from the speed switching device 10, and the thermistor TH2 is tuned to the machine body when the spindle is rotating. And the operation of the oil cooler 4 is controlled to cool the spindle head whose temperature has risen. With this, the total heat generation temperature of the spindle 3 is maintained at the predetermined value T ₀ . With the above operation, a small temperature change is suppressed in the vertical direction with the set temperature T _{0 at} which the spindle temperature saturates as the center value as shown by the broken line in FIG. 3B.

It is needless to say that the present invention is not limited to the above-mentioned one embodiment, and design changes can be made within the scope of the invention.

[0011]

[Effects] Since the present invention is configured as described above, it is possible to rapidly raise the oil temperature by stopping the oil cooler and controlling the heat generation of the heater when the spindle is stopped or at low speed rotation.
Then, when the spindle rotates at high speed, the heater is turned off to heat the spindle head, which is cooled by the operation control of the oil cooler, and the spindle temperature is saturated. Is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature control device for a spindle head according to the present invention.

FIG. 2 is a relational diagram showing switching of spindle rotation, heater heating, and oil cooler cooling according to the present invention.

FIG. 3 is a characteristic curve diagram showing a change in oil temperature at a set temperature value.

[Explanation of symbols]

1 Column 2 Spindle Head 3 Spindle O1, O2 Lubricating Oil 4 Oil Cooler (Oil Controller) H Heater 5 Spindle Rotation Detector 6 Controller 8 Spindle ON / OFF Switch 10 Speed Switch T ₀ Predetermined Value 100 Spindle Head Temperature Controller

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[Procedure amendment]

[Submission date] November 25, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (1)

[Claims] 1. A temperature controller for a spindle head, comprising an oil cooler for cooling lubricating oil supplied to the spindle head and a heater for heating the lubricating oil, while stopping the oil cooler when the spindle is stopped or at low speed. The controller controls the heat generation by the controller and cuts off the heat generated by the heater when the spindle rotates at medium or high speeds, while operating the oil cooler to keep the total heat generation temperature of the spindle at a specified value. apparatus.