JPH06155229A - Temperature control device of spindle head - Google Patents

Abstract

PURPOSE:To provide the temperature control device of a spindle head which is separately provided with an improved new heater for fine adjustment. CONSTITUTION:In the temperature control device of a spindle head provided with an oil cooler 4 for cooling lubricating oil O1 supplied to a spindle head 2 and a heater for heating the lubricating oil, a main heater H1 and a fine adjusting heater H2 are provided separately, and they are controlled by means of a controller 6 to adjust heating control voltage V by the spindle rotation signal from a spindle rotation detector 5 so as to precisely hold the totally heated temperature of a spindle 3 at a prescribed value T0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique in which a new heater for fine adjustment, which is an improved temperature control device for a spindle head, is additionally provided.

[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 The present invention provides a spindle head temperature control device which is provided with a new heater for fine adjustment, which is an improvement of the spindle head temperature control device for solving the above-mentioned problems. The purpose and task are to

[0005]

SUMMARY OF THE INVENTION The present invention provides a spindle head temperature control device comprising an oil cooler for cooling lubricating oil supplied to the spindle head, and a heater for heating the lubricating oil. It is controlled by the controller that adjusts the heating control voltage according to the spindle rotation signal from the detector, maximizes the heating value of the heater when the spindle stops or rotates at low speed, and is inversely proportional to the increase in heating value with increasing spindle rotation. The temperature control device for the spindle head is characterized in that the heating value of the heater is controlled to be reduced, and a heater for fine adjustment is separately provided to precisely maintain the total heating temperature of the spindle at a predetermined value.

In the spindle head temperature control device of the present invention, since the main heater and the heater for fine adjustment are separately provided, the heater for fine adjustment functions in response to a slight change in temperature of the main spindle, and a rapid temperature change occurs. On the other hand, the function of the main heater serves to precisely maintain the total heat generation temperature at a predetermined value.

[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, FIG. 2 is a characteristic curve diagram showing the relation between the spindle rotation and heater heating amount, and FIG. 3 is a set temperature of oil temperature. It is a characteristic curve figure which shows the variation in a value.

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 an oil cooler (oil controller) 4 for cooling the lubricating oil O1 supplied to the spindle head 2 through a pipe P1, a main heater H1 for heating the lubricating oil O1 and a heater for fine adjustment. H2 is provided separately. Further, the temperature control device 100 for the spindle head is configured so that the return lubricating oil O2 from the spindle head 2 is returned to the oil cooler (oil controller) 4 by the pipe P2. The main heater H1 and the heater H2 for fine adjustment detect the main spindle rotation signal (a) from the main spindle rotation detector 5 and the temperature of the return lubricating oil O2 from the main spindle head 2 in the thermistor TH1.
2 is controlled by the controller 6 that adjusts the heating control voltage V. Further, as shown in FIG. 2, the controller 6 controls the main heater H when the main spindle is stopped or at low speed.
The heat generation amount HQ of 1 is set to the maximum value HQm, and the heat generation amount HQ of the heater is controlled to be reduced to the minimum value HQn in inverse proportion to the increase of the heat generation amount SQ of the spindle accompanying the increase of the rotation of the spindle. Hold at the 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.

The controller 6 inputs the temperature information from the oil temperature sensor TH1 of the lubricating oil O2, and the main heater H1.
In addition to the rough heating control described above, the heating control is finely performed by the heater H2 for fine adjustment. As a result, the calorific value HQ of the main heater H1 is set to the maximum value HQm when the spindle is stopped or rotated at a low speed, and the heater calorific value HQ is inversely proportional to the increase of the spindle calorific value SQ as the spindle rotation increases.
The total heat generation temperature of the spindle 3 is maintained at a predetermined value T ₀ by controlling the reduction to Qn. With the above operation, the heater H2 for fine adjustment works around the set temperature T _{0 at} which the spindle temperature saturates as shown by the broken line in FIG.

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]

[Effect] Since the present invention is the temperature control device for the spindle head in which the heater for fine adjustment is additionally provided in addition to the equipment, the heater for fine adjustment functions to the delicate temperature change of the spindle, and it is possible to prevent a sudden temperature change. On the other hand, the function of the main heater precisely keeps the total heat generation temperature at a predetermined value, and suppresses the spindle temperature to a very small temperature change up and down with the set temperature at which the spindle temperature saturates as the center value, minimizing thermal displacement of the spindle. It has a suppressing effect.

[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 characteristic curve diagram showing the present invention in a relationship between a spindle rotation and a heater heating amount.

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) H1 Main Heater H2 Fine Adjustment Heater 5 Spindle Rotation Detector 6 Controller TH1 Thermistor HQ Heat Generation SQ Spindle Heat Generation 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 control device 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, wherein the heater uses a spindle rotation signal from a spindle rotation detector. It is controlled by a controller that adjusts the heating control voltage, and maximizes the heat value of the heater when the spindle is stopped or rotates at low speed, and also controls the heater heat amount in inverse proportion to the increase in the heat value as the spindle rotation increases. A temperature control device for a spindle head, wherein a heater for fine adjustment is separately provided to precisely maintain the total heat generation temperature of the spindle at a predetermined value.