JPS60255335A - Machine tool equipped with thermal-deformation preventing apparatus - Google Patents

Abstract

PURPOSE:To maintain high working accuracy for a long period by arranging a plurality of piping blocks for lubricating oil onto the opposite side to the slidable surface of a supporting body for supporting a slidable body by the slidable surface through a selector valve so that a lubricating-oil piping circuit is formed. CONSTITUTION:On starting the operation of a machine tool, the lubricating oil same to the lubricating oil supplied into the piping circuit 10 for a spindle head H is supplied onto the back-surface side of a column C through a lubricating-oil pipe 20. The lubricating oil supplied onto the back-surface side of the column C operates solenoid valves 21a-21e according to the position of the spindle head H, and then supplied into the piping blocks 22a-22e arranged at the back-surface position on the opposite side to the part where the spindle head H is positioned, and lubricates the back-surface of the column C. Therefore, the slidable surface and the back-surface of the column C are always balanced thermally, and high accuracy can be kept for a long period.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a machine tool equipped with a thermal displacement prevention device.

[Technical background of the invention and its problems]

In a machine tool equipped with a sliding body, such as a spindle head, which reciprocates along the sliding surface, and a support, such as a column, on which the sliding surface of the sliding body is formed, the sliding surface of the column is
The sliding spindle head is heated by a heat source such as the temperature of the lubricating oil on the spindle head, causing thermal deformation. The amount of thermal deformation increases as the spindle head becomes larger and operates at higher speeds, and furthermore, after the machine tool has been used for a long time, it becomes a value that cannot be ignored in terms of machining accuracy.

In recent years, as machine tools have become larger and faster, unmanned operation has progressed, and there is a demand for machine tools that do not cause thermal displacement in the column even when used for long periods of time.

[Purpose of the invention]

The present invention has been made in consideration of these points,
We have developed a machine tool with a thermal displacement prevention device that prevents thermal displacement of machine tools in which the sliding body slides back and forth on the sliding surface formed on the support, and can maintain high machining accuracy even during long-term operation. The purpose is to provide.

[Summary of the invention]

The present invention is a machine tool equipped with a thermal displacement prevention device, which includes a sliding body that slides backward along a sliding surface, and a support body on which a sliding surface of the sliding body is formed. On the opposite side, a plurality of piping blocks formed by lubricating oil pipes branched from the lubricating oil piping circuit of the sliding body are connected through switching valves to form parallel lubricating oil piping circuits. It is characterized by its location.

According to the present invention, lubricating oil having approximately the same temperature as the lubricating oil of the sliding body is supplied to one of the piping blocks corresponding to the sliding position of the sliding body and arranged on the back surface of the support body, The sliding surface and the opposite surface of the support are brought to approximately the same temperature. As a result, the sliding surface of the support and the opposite surface are always thermally symmetrical, and thermal displacement of the support is prevented.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a lubricating oil piping circuit connected to a machine tool equipped with a thermal displacement prevention device according to the present invention.

A spindle head lubricating oil piping circuit 10 for supplying lubricating oil for bearing lubrication, for example, is provided to the spindle head 1. Lubricating oil having approximately the same temperature as this piping circuit 10 is supplied to the back of the column C via a lubricating oil pipe 20 using a separate pump. This lubricating oil pipe 20 is further divided to form a plurality (five in the embodiment shown in FIG. 1) of piping blocks 22a to 22e via electromagnetic switching valves 21a to 21e. Piping blocks 22a to 22
The lubricating oil piping circuits e are composed of meandering lubricating oil pipes and are parallel to each other. The piping blocks 22'a to 22e are sequentially arranged adjacent to each other in the sliding direction of the spindle head 1'' on the back surface of the column C, that is, on the side opposite to the side where the sliding surface of the spindle head H is formed. There is.

Each of the piping blocks 22a to 22e joins the lubricating oil pipe 23 again on the downstream side, and this lubricating oil pipe 23 is connected to the same oil tank T as the lubricating oil piping circuit 10 of the spindle head H.

FIG. 2 is a schematic explanatory diagram showing an example in which the present invention is applied to a crossbore '1g. In other words, on the back of the column,
Lubricating oil pipes 22a to 22e divided to form several piping blocks are sequentially arranged adjacent to each other in the sliding direction of the main 1t11+head 1-1, and are covered with a heat insulating material 24.

Next, the operation of this embodiment having such a configuration will be explained.

When the machine tool starts operating, the piping circuit 10 of the spindle head 1
The lubricating oil equivalent to the lubricating oil supplied to the lubricating oil vibrator 20
] is sent to the rear side of ram C.

The lubricating oil sent to the back side of this column C is J: shaft head H
The electromagnetic switching valves 21a to 21e are operated depending on the position of the spindle head H, and lubricating oil is supplied to the piping blocks 22a to 22e disposed on the back side on the opposite side from the part where the spindle head H is located. In FIG. 2, lubricating oil pipes 22a~
The blacked out part of 22e is piping 5 circuit 1
A state in which lubricating oil is supplied from 0 is shown, and other parts are shown in a state in which no oil is supplied.

As a result, lubricating oil at approximately the same temperature as the lubricating oil being supplied to the spindle head is always supplied to the back of column C at a position exactly opposite to the sliding position of spindle head 1. , and the sliding surface of the spindle head of column C and the surface on the opposite side (
The back surface) is in a state of thermal symmetry.

In this way, according to this embodiment, despite the sliding displacement of the spindle head, the sliding movement of the ram C and the back surface are always maintained in a thermally balanced state, even after long-term use. ] No thermal displacement occurs in the ram C.

In addition, the electromagnetic switching valve 2 corresponding to each piping block
Selection of 1a to 21e can be performed, for example, by operating position detection limits 1 to 1 to switches (not shown) attached to column C.

In the embodiment shown in FIG. 1, the pump that supplies lubricating oil to the piping block is connected to the spindle head lubricating oil piping circuit 1.
Although this pump is separate from the pump No. 0, both pumps may be used in common.

In addition, in this embodiment, the spindle head is
What kind of support is crossbore Qi with columns? Although this has been explained above, the same effect can also be obtained in other machining machines such as a planing machine and a plano mirror equipped with a cross rail as a support.

(Effects of the Invention) As explained above, according to the present invention, it is possible to effectively prevent thermal displacement of a machine tool equipped with a sliding body that slides on the sliding surface of a support. High-precision machining capability can also be achieved through intermittent operation.

[Brief explanation of the drawing]

Fig. 1 is a lubricating oil piping circuit diagram showing an embodiment of the present invention;
The figure is a schematic side sectional view showing an example in which the present invention is applied to a width boring machine. 10... Spindle head In'l fresh oil piping circuit, 20... Lubricating oil pipe, 21a to 21e... Solenoid switching valve, 22
a to 22e...Piping block, C...Column, H
...Spindle head, T...tank. Applicant's representative Kiyosuke Inomata 1st 2nd 4th

Claims (1)

[Scope of Claims] 1. A machine tool equipped with a thermal displacement prevention device comprising a sliding body that reciprocates along a sliding surface and a support on which the sliding surface of the sliding body is formed, wherein the support On the surface opposite to the sliding surface, a plurality of piping blocks formed by lubricant pipes branched from the lubricant piping circuit of the front sliding body are respectively switched to form parallel lubricant piping circuits. A machine tool equipped with a thermal displacement prevention device, characterized in that it is arranged through a valve. 2. A machine tool with a thermal displacement prevention device according to claim 1, wherein the support body is a column, and the sliding body is a spindle head slidably mounted on the column.