JPH03219158A - Ball screw centering/fitting method - Google Patents

Abstract

PURPOSE:To enable highly accurate fitting of a ball screw without necessity of machining parts with high accuracy by moving a nut member close to a second supporting member so that its position may be conformed to the position of a second bearing, and then moving the nut member close to a first supporting member so as to conform the position of a first bearing to that of the nut member. CONSTITUTION:A table 1 moved being guided by a guide member 10 is provided with the nut member 5 of a ball screw 4 in such a way as to be displaceable in the right-angled direction to the axis of the ball screw 4. A first bearing 17 fitted at one end part of the ball screw 4 is held by a bearing housing 18 and supported by a first supporting member 19 in such a way as to be displaceable in the right-angled direction to the axial direction. A second bearing 23 fitted at the other end part is supported in the undisplaceable state by a second supporting member 24 and connected in the undisplaceable state to the table 1 after moving the nut member 5 close to the second supporting member 24, then the nut member 5 is moved to the first supporting member 19, and the bearing housing 18 is connected in the undisplaceable state to the first supporting member 19.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for accurately centering and installing a hole screw, and is applicable to, for example, a positioning table or precision measuring machine that uses a ball screw as a feed screw. This article relates to a method for centering and installing a ball screw.

[Background technology]

FIG. 2 shows a device using a ball screw, and this device is a positioning table for transporting a workpiece attached to a table 1 to an accurate position for processing, for example. The rotation of the motor 2 is transmitted to the ball screw 4 via the coupling 3, and the nut member 5 is screwed onto the outer periphery of the ball screw 4.
The table 1 is moved by this. Both ends of the ball screw 4 are supported by first and second support members 8 and 9 via first and second bearings 6 and 7.

In the above, the table I is guided by the guide member 10 and moves forward and backward, and the table 1 is positioned by the guide member 10 in the vertical direction and the left-right direction (front and back directions of the paper in FIG. 2; the same applies hereinafter). Further, the nut member 5 is in precise contact with the hole screw 4 via the ball 5A. For this reason, the parallel accuracy of the guide member 10 and the hole thread 4 in the vertical and horizontal directions, the mounting height of the nut member 5 at the hanging portion IA of the table 1, and the both ends of the hole thread 4 on the supporting members 8 and 9 are determined. The support height must be highly accurate.

[Problem to be solved by the invention]

In order to ensure the centering accuracy of such a hole screw 4,
Conventionally, holes 11 for attaching the nut member 5 to the hanging portion IA and holes 12 and 13 for attaching the bearings 6 and 7 to the support members 8 and 9 are required to be machined with a high degree of precision. According to this, manufacturing of parts such as the supporting members 8 and 9 becomes troublesome, and much time and effort are required to manufacture the parts.

An object of the present invention is to provide a ball screw that eliminates the need for high-precision machining of parts such as support members, thereby making it easy to manufacture parts, and that allows ball screws to be mounted accurately with a high degree of precision. It provides a centering installation method.

[Means for solving problems]

In the centering and mounting method for a ball screw according to the present invention, a nut member screwed onto the outer periphery of a hole screw is disposed on a moving body that moves while being guided by a guide member so that it can be displaced in a direction perpendicular to the axial direction of the ball screw. A first bearing rotatably fitted to one end of the ball screw is held by a bearing housing, and the bearing housing is movable by a first support member in a direction perpendicular to the axial direction of the ball screw. At the same time, a second bearing fitted to the other end of the ball screw is immovably supported by a second support member, and the nut member is supported by a second bearing fitted to the other end of the ball screw.
After approaching the support member, the nut member is non-displaceably coupled to the movable body, then the nut member is brought close to the first support member, and then the bearing hound is non-displaceably coupled to the first support member. It is characterized by this.

[Effect]

When the nut member is brought close to the second support member, the position of the nut member automatically matches the position of the second bearing by displacing the nut member in a direction perpendicular to the axial direction of the ball screw. When approaching the first support member, the position of the first bearing automatically coincides with the position of the NAND member and the second bearing by displacing the bearing housing sink' in a direction perpendicular to the axial direction of the ball screw. This only allows centering of the hole screw.

〔Example〕

This embodiment is shown in FIG. In the following description, the same reference numerals will be used for the same members as those already described.

The mounting method according to this embodiment is similar to that shown in FIG.
This is applied to a positioning table in which the table l moves with the rotation of . A hole 14 into which the main body shaft portion 5B of the nut member 5 is inserted is formed through the hanging portion IA of the table l, and this hole 14 has a larger diameter than the main body shaft portion 5B. Further, the flange portion 5C of the nut member 5 has a hole 16 into which a bolt 15 for connecting the nut member 5 to the hanging portion 1A is inserted.
However, this hole 16 also has a larger diameter than the bolt 15.

One end 4A of the hole screw 4 is supported by a first support member 19 via a first bearing 17 and a bearing housing sink 18.

The bearing 17 is fitted into the hole 20 of the bearing housing 18,
As a result, the bearing 17 is held by the bearing housing 18,
Bearing housing 18 is coupled to support member 19 with bolts 21 . The hole 22 of the support member 19 into which the bolt 21 is inserted has a larger diameter than the bolt 21.

The other end 4B of the ball screw 4 is supported by a second support member 24 via a second bearing 23. Support member 2 of bearing 23
4 is assembled in the same manner as the bearing 7 in the conventional support member 9 shown in FIG. Fitted in.

Next, the installation and assembly work of the above hole screws will be described.

Lightly tighten the bolt 15 and bolt 21. As a result, the nut member 5, whose main body shaft portion 5B is loosely engaged with the hole 14, is moved in the direction perpendicular to the axial direction of the hole screw 4, that is, in the vertical direction and in the horizontal direction (the first
The front and back directions of the paper in the figure.

same as below. ), and the bolt 21 or hole 2
The bearing housing 18 loosely coupled to the first support member 19
The ball screw 4 can be displaced in a direction perpendicular to the axial direction of the ball screw 4. After this, the end 4A of the ball screw 4 is supported by a float ink with a jig or the like, and the hole screw 4 is manually rotated to move the nut member 5 and the table 1 to the right in FIG. 5 closer to the second support member 24. As a result, the nut member 5 is displaced vertically and horizontally with respect to the hanging portion IA, and the position of the nut member 5 automatically matches the position of the second bearing 23 at the end 4B of the hole screw 4.

Next, by tightening the bolt 15, the nut member 5
is non-displaceably coupled to the depending portion IA at that location.

As described above, the nut member 5 is displaced relative to the hanging portion IA and the position of the nut member 5 is the same as that of the second bearing 23. Therefore, unlike the conventional example, the hole 25 into which the bearing 23 is fitted is inserted into the support member 24. There is no longer a need for high-precision machining at precise locations. Furthermore, since the hole 14 in the hanging portion IA of the table l is for loosely engaging the main body shaft portion 5B of the nut member 5, this hole 14 also does not need to be machined with high precision.

Next, rotate the hole screw 4 in the opposite direction to move the nut member 5 and table 1 to the left in FIG.
The nut member 5 is brought close to the first support member 19. During this work process, the table 1 moves while being positioned in the vertical and horizontal directions by the guide member 10, so the bearing housing 18 is displaced in the vertical and horizontal directions with respect to the support member 19, and as a result, the ball screw 4 It is parallel to the guide member 10 in the vertical and horizontal directions, and the position of the first bearing 17 in the bearing housing 18 automatically matches the positions of the nut member 5 and the second bearing 23. Thereafter, by tightening the port 21, the bearing housing 18 is irreplaceably connected to the support member 19 at that position.

At this time, the mounting height of the nut member 5 on the hanging portion IA of the table 1 and the supporting height of both ends 4A and 4B of the hole screw 4 on the support member 19.24 match exactly, and the hole screw 4 and the guide Accurate parallelism in the vertical and horizontal directions with respect to the member 10 has been achieved, and when the ball screw 4 and the coupling 3 are connected and the motor 2 is rotated, the table 1 moves smoothly.

Although the embodiments described above were for ball screws of positioning tables, the present invention can also be applied to ball screws of precision measuring machines, for example, and the deviation is caused by the ball being supported at both ends or by the support member. Screw the nut member around the outer periphery of the screw,
The present invention can be applied to any device or machine that moves a moving body guided by a guide member by rotation of a ball screw.

〔Effect of the invention〕

According to the present invention, there is no need to process parts such as support members with high precision, making it easy to manufacture the parts, and yet it is possible to center the ball screw with high precision and install it accurately. become able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a view similar to FIG. 1 showing a conventional example. 4... Hole screw, 4A, 4B... End of hole screw, 5... Nut member, 10... Guide member, 15
゜21... Holt, 17.23... First and second bearings, 18... Bearing housing, 19.24... First,
Second support member.

Claims (1)

[Claims] (1) A nut member screwed onto the outer periphery of a ball screw is disposed on a moving body that moves while being guided by a guide member so as to be displaceable in a direction perpendicular to the axial direction of the ball screw, and one end of the ball screw A first bearing rotatably fitted to the ball screw is held by a bearing housing, and this bearing housing is supported by a first support member so as to be displaceable in a direction perpendicular to the axial direction of the ball screw. After the second bearing fitted to the end is immovably supported by a second support member, and the nut member is brought close to the second support member, this nut member is immovably coupled to the movable body, and then the A method for centering and mounting a ball screw, comprising bringing a nut member closer to a first support member, and then irreplaceably coupling the bearing housing to the first support member.