JPH0523948A - Protective cover device for guide part in machine tool - Google Patents

Abstract

(57) [Abstract] [Purpose] Cover the ball screw or LM guide device that guides the movement of the spindle table of the machine tool with a cover to prevent dust and cutting powder from entering, and eliminate the need for a storage space for the cover and attach it to the spindle. The overhang of the mounting spindle has been reduced. [Structure] A ball screw cover 18 and an LM guide cover 20 are passed through a through hole 17 of the spindle table 7 to cover the ball screw 11 and the entire length of the LM guide device.
Both ends of both covers were held by the guide unit body 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective cover device for covering a ball screw or an LM guide which constitutes a unit in a unit for moving a spindle table mounted with a tool of a machine tool so as to prevent cutting powder from entering.

[0002]

2. Description of the Related Art A guide unit including a ball screw for moving a spindle table of a machine tool, an LM guide device for guiding the movement of the spindle table, and the like causes abnormal wear when dust or cutting powder enters the ball screw or the LM guide device. Reduce the machining accuracy and shorten the service life of the guide unit. Therefore, conventionally, the ball screw and the LM guide device have been covered with a dedicated bellows, a telescopic cover, a steel bellows, or the like.

Further, as a sliding part protection structure in a linear motion mechanism, an upper cover is disposed so as to penetrate the cavity between the vertically movable substrates so as to cover the upper part of the drive screw of the movable substrate and the slide base for guiding the movement. What you did is Shokai 57-1
No. 70887.

[0004]

Among the conventional techniques, when the ball screw and the LM guide device of the movement guide unit of the spindle table are covered with a dedicated bellows or a telescopic cover, the LM guide device with a long stroke is exclusively covered. Bellows and the like require a storage space in the most contracted state in addition to a portion that covers the LM guide portion. Therefore, the supporting position of the spindle attached to the main spindle of the main spindle table becomes far from the workpiece, or the overhang becomes large when the spindle is attached. As described above, when the LM guide portion with respect to the workpiece becomes far away and the main spindle head is forced to approach the workpiece, the LM guide portion overhangs, and there is a problem that the machining accuracy deteriorates.

When the driving screw and the slide base are covered with the upper cover, the structure can be applied to a structure in which there is no protruding member in the cavity between the upper and lower moving substrates, but the structure like the main shaft. Since a table supporting a large weight has a reinforcing rib under the table, a conventional upper cover cannot be applied to such a structure. Further, in the configuration in which the upper cover is penetrated into the cavity between the upper and lower two moving substrates, the drive screw and the slide base are covered from a position apart from the upper side, and it is not possible to sufficiently prevent dust and cutting powder from entering. It was not a satisfactory cover for the movement guide of the spindle table.

Therefore, according to the present invention, the ball screw for guiding the movement of the spindle table and the LM guide device are covered with a cover at an upper position close to them to sufficiently prevent dust and cutting powder from entering and improve the precision of the movement guide. The purpose of this is to extend the service life of the spindle and to reduce the overhang of the spindle attached to the spindle by eliminating the need for a cover storage space.

[0007]

SUMMARY OF THE INVENTION The present invention achieves the above object in a machine tool in which a spindle table is guided by an LM guide device and moved by driving a ball screw. Therefore, the table to which the spindle is attached is configured to have a through space between the upper member and the lower member,
A ball screw cover is inserted through the central portion of the through hole, and LM guide covers are inserted through both sides of the ball screw cover to cover the entire length of the ball screw and the LM guide device, and both ends of the ball screw cover and each LM guide cover are guided. It was held in the body.

Further, in order to improve the sealing performance between the both ends of the table and the ball screw cover and the LM guide cover,
Scrapers may be provided at both ends of the table, or both ends of the ball screw cover and the LM guide cover may be held by the guide unit main body via side covers, respectively.

[0009]

In the protective cover device for the guide part of the machine tool, the respective covers covering the ball screw and the upper part of the LM guide are fixed to the guide unit main body and do not contract, so that the main shaft table moves. It is not necessary to provide a storage part for the cover. Therefore, the supporting position of the spindle attached to the main shaft can be brought closer to the workpiece, and the machining accuracy is improved. Further, the ball screw cover and the LM guide cover are penetrated into the through space between the upper member and the lower member constituting the spindle table, and the covers are formed in a cross-sectional shape along the upper portion thereof close to the ball screw and the LM guide device. Therefore, it is possible to sufficiently prevent dust and cutting powder from entering. Further, since each cover is provided between the reinforcing ribs protruding into the through space of the spindle table, the height of the table can be reduced and the movement of the spindle can be stabilized.

[0010]

Embodiments of the present invention will be described with reference to FIGS.
In a machine tool to which the present invention is applied, a machining jig 2 is provided in the center of a base 1, and a spindle unit 3 is provided on both sides of the machining jig 2, and a work piece on the machining jig 2 is attached by a spindle attached to a spindle 4. Is designed to be processed. It should be noted that the workpiece is conveyed by a conveyor 5 arranged on the front side of the machine tool, and is carried onto the machining jig 2 from the front position of the machining jig 2 by the shift unit 6.

In the spindle unit 3, the spindle 4 is mounted on the table 7
And the table 7 is moved forward and backward with respect to the processing jig 2 side by the drive motor 8 via the movement guide unit 9. That is, the output shaft of the drive motor 8 is connected to the ball screw 11 via the coupling 10, and the table 7 is moved along the long ball screw 11 via the ball screw unit 11a provided on the outer circumference of the ball screw. The outer circumference of the ball screw 11 is covered with a bellows 13. Further, both ends of the ball screw 11 are respectively provided with a guide unit main body 14 via a bearing 12.
The guide unit body 14 is fixed on the base 1.

An LM guide rail 15 is provided on each of the guide unit main bodies 14 on both sides of the ball screw 11, and an LM guide 16 is slidably provided on each LM guide rail 15. The LM guide device includes an LM guide rail 15 and an LM guide 16. Further, the table 7 is provided above each LM guide rail 15, and the LM guide 16 is guided along the LM guide rail 15 when the table 7 is moved by the ball screw unit. The table 7 has an upper member 7a having a flat upper surface and two reinforcing ribs 7c at the lower portion.
And a lower member 7b having two U-shaped cross-sections attached to the LM guide 16, and a through space 17 at a portion sandwiched between two reinforcing ribs 7c between the upper member 7a and the lower member 7b. Is formed, and the through hole 17 is located above the ball screw 11 and arranged in parallel therewith. Further, through holes 17a are formed between the upper member 7a and the lower member 7b outside the reinforcing ribs 7c, and the through holes 17a are located in parallel with the upper portion of the LM guide rail 15.

A ball screw cover 18 having a semi-circular cross section is penetrated through a through hole 17 above the ball screw 11 of the table 7. The ball screw cover 18 covers the entire length of the ball screw 11 and both ends thereof are provided with side covers 19 to guide unit main body 14 respectively.
Fixed to. Further, the LM guide covers 20 each having a U-shaped cross section are passed through the through spaces 17a in the upper portions of both LM guide rails 15, and they extend on the entire length of the LM guide rails 15 with the openings of the U-shaped cross section facing downward. Covering,
Both ends are fixed to the guide unit body 14 via the side covers 21, respectively. A scraper 22 that seals a gap with the ball screw cover 18 and a scraper 23 that seals a gap with the LM guide cover 20 are provided at both ends of the table 7 in the moving direction. Remove the dust and cutting powder on each scraper 22,
23 is supposed to be paid off.

[0014]

In the protective cover device for the guide portion in the machine tool of the present invention, the through hole of the spindle table is penetrated.
Two covers cover the upper part of the ball screw and the upper parts of the LM guides on both sides. Since these covers are fixed and do not require a storage part for the movement of the spindle table, the spindle support position for the work piece. Can be close to, and the processing accuracy can be improved. In addition, each cover penetrates the through hole of the spindle table to allow ball screws and L
Since the upper part near the M guide is covered, dust and cutting powder can be sufficiently prevented from entering, and the height of the spindle table can be lowered, so that the spindle can be moved stably. Furthermore, scrapers are provided at both ends of the spindle table to wipe off dust and cutting powder on each cover, so the table can be moved smoothly at all times, and cutting powder, etc., enters the lower movement guide section. Can also be prevented.

[Brief description of drawings]

FIG. 1 is a front view of a machine tool to which a protective cover device of the present invention is applied.

FIG. 2 is a plan view of the machine tool of FIG.

FIG. 3 is a front sectional view of a ball screw portion of the protective cover device of the present invention.

FIG. 4 is a front sectional view of a portion of an LM guide rail in the protective cover device of the present invention.

FIG. 5 is a partial cross-sectional plan view of the protective cover device of the present invention.

FIG. 6 is a side sectional view of the protective cover device of the present invention.

[Explanation of symbols]

7 table 11 ball screw 15 LM guide rail 16 LM Guide 18 Ball screw cover 19 Side cover 20 LM guide cover 21 Side cover 22 scraper 23 scrapers

Claims (2)

[Claims] 1. A ball screw is arranged on a guide unit main body, LM guide devices are arranged on both sides of the guide unit, and a table having a spindle attached is arranged on the ball screw and the upper part of the LM guide device, and the table is driven by driving the ball screw. In the machine tool in which the LM guide device is guided to move the table, the table is configured to have a through hole between the upper member and the lower member, and a ball screw cover is provided in the center of the through hole. The LM guide covers are penetrated on both sides of the ball screw cover so as to cover the entire length of the ball screw and the LM guide device, and both ends of the ball screw cover and each LM guide device are held by the guide unit main body. Protective cover device for guides in machine tools. 2. Both ends of the ball screw cover and the LM guide cover are held by the guide unit main body through side covers, respectively, and sealing scrapers are provided at both ends of the table, and both end portions of the table, the upper surface of the ball screw cover and the LM.
The protective cover device for a guide portion in a machine tool according to claim 1, wherein the guide cover is slidably sealed between the guide cover and the upper surface portion.