JPS6328535A - Ball slide way - Google Patents

Abstract

PURPOSE:To easily form a turning groove by forming each half part of the turning groove onto a cap and a ball holder and forming a nearly U-shaped turning groove by assembling the ball holder and the cap. CONSTITUTION:Arcuate grooves 21 and 22 connected with the edge parts of no-load guide grooves 14 and 15 are formed in the upper and lower stages onto a cap 12. Arcuate grooves 27 and 28 which are extended from the guide grooves 17 and 18 and connected with the edge parts of the grooves 21 and 22 are formed at the edge part of a ball holding device 11. The cap 12 is installed onto a ball slide part 9 by an installation screw 31. The first ball circulation passage 32 is formed from the first load guide groove 19, the first no-load guide grove 15, and the a pair of front and rear turning grooves 29 by installing the cap 12 together with a core 23 onto the installation part 10. At the same time, the second ball circulation passage 33 is formed from the second load guide groove 20, second no-load guide groove 16, and a turning groove 30.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ball slideway used when a work table is slidably supported on a bed in a machine tool or the like.

Conventionally, in machine tools and the like where a work table is slidably supported on a bed, in order to improve work efficiency, it is necessary to increase the sliding speed of the work table. An important issue is to reduce dynamic resistance. Various types of ball slideways have been developed with the aim of solving this problem, and representative ones include JP-A-57-27631, JP-A-57-189746, and JP-A-Sho 57-189746. 58-37315
No. 58-45226.

There is one described in US Pat. No. 4,030,191.

Problems to be Solved by the Invention Conventionally, a ball circulation path in a ball slideway in which a large number of balls are rotatably held has a load guide groove, a non-load guide groove, and a structure between the load guide groove and the non-load guide groove. It consists of a turning groove that connects the ends. In order to allow the ball to roll smoothly in the turning groove, it is necessary to process the inner circumferential surface of the turning groove smoothly and precisely, which is difficult and time-consuming.

Means for solving the problem A ball slide part is formed, which consists of a mounting part of the bracket, a ball retainer and a cap attached to this mounting part, and a load guide groove, a non-load guide groove, and a ball slide part are formed in this ball slide part. A ball circulation path is formed of a substantially U-shaped turning groove that connects the ends of the load guide groove and the non-load guide groove, and holds a large number of balls in a rotatable manner. Approximately half of the turning groove on the side where one end is connected to the end of the load guide groove is formed on the ball holder, and approximately half of the turning groove on the side where one end is connected to the end of the no-load guide groove is formed on the cap. Form.

Approximately half of the working turning groove is formed in the ball holder, and the other half is formed in the cap, and the turning groove is formed by assembling the ball holder and the cap.

Example An embodiment of the present invention will be described based on the drawings.

First, a pair of left and right guide parts 2 are fixed in parallel to each other on the upper part of a bed 1 of a machine tool or the like. These guide parts 2 are formed in a double-headed rail shape, and there are four outward facing sides on both left and right sides along the longitudinal direction of the guide parts 2.
A recess 4 is formed having a pair of upper and lower inclined surfaces 3 that widen at an angle of 5@. Guide grooves 5 and 6 are formed in the inclined surfaces 3 along the longitudinal direction of these inclined surfaces 3.

Next, brackets 8 having a U-shaped cross section are fixed to the four corners of the lower surface of the work table 7, and surround the upper surface and both left and right side surfaces of the guide portion 2.

The bracket 8 is provided with a pair of ball slide parts 9 facing the recess 4. These ball slide parts 9 have a ball retainer 11 facing the recessed part 4 mounted on the mounting part 10 of the bracket 8, and a ball retainer 11 facing the recessed part 4.
It is constructed by attaching a cap 12 to the longitudinal end of 0.

Guide grooves 13 and 14 are formed on the side surface of the mounting portion 10 facing the recess 4 and have an arcuate cross-section and are parallel to and opposite to the guide grooves 5 and 6. Further, the mounting portion 10 is formed with a first no-load guide groove 15 and a second no-load guide groove 16 having a circular cross section and arranged vertically and passing through the mounting portion 10 in the longitudinal direction. There is.

The ball holder 11 is formed with guide grooves 17.degree. 18 having an arcuate cross-section and facing the guide grooves 13.degree. 14. By attaching the ball holder 11 to the mounting portion 10, the guide grooves 13 and 17 form a first load guide groove 19 that faces the guide groove 5, and the guide grooves 14 and 18 form a first load guide groove 19 that faces the guide groove 5. A second load guide groove 20 facing the guide groove 6 is formed by this.

The cap 12 has two arcuate grooves 21 and 22 connected to the ends of the no-load guide grooves 14 and 15, upper and lower. In addition, the cap 12 has a core mounting recess 24 in which a substantially semi-cylindrical core 23 is attached to the groove 21.
．． The grooves 21 and 22 are formed in a direction perpendicular to the center of curvature of the grooves 21 and 22. Furthermore, the cap 1
An engagement recess 25 is formed in the engagement recess 2.
5 is engaged with an engaging protrusion 26 formed at the end of the ball holder 11. An arcuate groove 27.2 is provided at the end of the ball holder 11, extending from the guide groove 17.18 and connected to the end of the groove 21.22.
8 is formed. And these grooves 21.27
(22, 28) and the load guide groove 1 by the core 23.
A substantially U-shaped turning groove 29.30 is formed which connects the end of the guide groove 9.20 and the end of the no-load guide groove 14.15.

The cap 12 is attached to the ball slide section 9 using a mounting screw 31, and during this attachment, the core 23 installed in the core attachment recess 24 is attached to the cap 12 and the hole slide section 9. It is installed in a sandwiched state between the two. By attaching the cap 12 together with the core 23 to the mounting portion 10, the first load guide groove 19, the first no-load guide groove 15, and the pair of front and rear turning grooves 29 provide a first ball circulation. Similarly, a second ball circulation path 33 is formed by the second load guide groove 20, the second non-load guide groove 16, and the turning groove 30. These ball circulation paths 32.3
A large number of balls 34 are rotatably held within the ball 3. Further, a bottom seal 35 that covers the lower surface of the ball slide portion 9 and the cap 12 is attached to the mounting portion 10 with a mounting screw 36.

In such a configuration, the work table 7 is connected to the guide section 2.
When installed in the load guide groove 19.20, the ball 34 located in the load guide groove 19.20 is pressed against the inner circumferential surface of the guide groove 13.14 and the inner circumferential surfaces of the guide grooves 5 and 6. There is. On the other hand, no load acts on the balls 34 located in the unloaded guide grooves 1.5.16 and the pivot grooves 29.30, and are maintained in an unloaded state. When the work table 7 is slid, the balls 34 are guided by the guide grooves 5 and 6 and the guide grooves 13.14, etc., and roll, and the balls 34 move from the load guide groove 19.20 to one of the swing grooves 19.30. It passes through the unloaded guide groove 15.16 and circulates again through the other pivot groove 29.30 into the loaded guide groove 19.20. In this way, the ball 34 is connected to the ball circulation path 32.3.
3, the work table 7 is slidably supported on the bed 1, and the work table 7 slides smoothly. Furthermore, even if a force is applied to the work table 7 from the lateral direction, the balls 34 are engaged with the upper and lower two rows of guide grooves 5 and 6 on both sides of the guide section 2, and the work table 7 can be held securely. is being carried out. The balls 34 in the turning grooves 29, 30 roll along the curved outer peripheral surface of the core 23, and roll smoothly without disturbing the direction of movement of the balls 34.

Here, the turning grooves 29.30 are the grooves 21.22 formed in the cap 12 and the grooves 27.2 formed in the ball holder 11.
8, and each groove 21
, 22, 27.28 constitute approximately half of the turning groove 29.30. Therefore, compared to the case where the entire turning groove is integrally formed in one part, machining becomes easier and machining accuracy is improved. Then, the balls 34 roll smoothly in the turning grooves 29, 30, and the work table 7 slides smoothly, improving work efficiency.

When inserting the ball 34 into the ball circulation path 32.33, first attach the ball holder 11 and one cap 12 to the mounting portion 1° of the bracket 7, and then insert the ball holder 11 and one cap 12 into the open load guide groove 19.20. The ball 34 is inserted from the end or the end of the no-load guide grooves 15, 16 which are in an open state. Next, apply grease or the like to the turning grooves 29 and 30 of the other cap 12 and attach the remaining balls 34, and further,
Attach the core 23 to the core mounting recess 24 and attach the cap 1.
2 to the mounting portion 10 of the bracket 7, the ball insertion work is completed.

Effects of the Invention The present invention has the following advantages: As described above, approximately half of the turning groove is formed in each of the cap and the ball holder, and a substantially U-shaped turning groove is formed by assembling the ball holder and the cap. The turning groove can be easily formed and the machining accuracy can be improved, and the improved machining accuracy allows the ball to roll smoothly in the turning groove, and the sliding of the work table can be improved. This has the effect of making it possible to carry out operations smoothly and improving work efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional front view, FIG. 2 is a front view showing a state in which the core is attached to the cap, and FIG. 3 is taken along line A-A in FIG. 2. The cross-sectional view, FIG. 4, is taken along the line BB in FIG. 2! 5 is a sectional view taken along the line CC in FIG. 2, FIG. 6 is a perspective view showing the core, and FIG.
8 is a sectional view taken along the line DD in FIG. 7, and FIG. 9 is a perspective view showing the entire machine tool. 2... Guide part, 5, 6... Guide groove, 8... Bracket, 9... Ball slide part, 10... Mounting part, 11... Ball retainer, 12... Cap ,1
5.16...No-load guide groove, 19.20...Load guide groove, 29.30...Swivel groove, 32.33...
Ball circulation path, 34...Ball exit order Person Samon Kogyo Co., Ltd. JA Diagram A\-R, 73Z Alternate Diagram 33 I

Claims (1)

[Claims] A guide portion having a rectangular cross-sectional shape and a bracket surrounding the upper surface and both left and right side surfaces of the guide portion are provided, and a ball slide portion is provided on the bracket to face a guide groove formed along the longitudinal direction of the guide portion, A ball consisting of a load guide groove and a non-load guide groove facing the groove, and a substantially U-shaped turning groove connecting the ends of the load guide groove and the non-load guide groove, and holding a large number of balls in a freely rolling manner. In a ball slideway in which a circulation path is formed in the ball slide part, the ball slide part is connected to a mounting part of the bracket, a ball retainer mounted to the mounting part facing the guide part, and a longitudinal end of the mounting part. a cap attached to the ball holder, one end of which is connected to the end of the load guide groove, approximately half of the pivot groove of the ball holder, and one end of which is connected to the end of the no-load guide groove; A ball slideway characterized in that approximately half of the turning groove on the side connected to the cap is formed in the cap.