JPS628430Y2 - - Google Patents

Description

[Detailed description of the invention] In recent years, linear motion bearing devices (hereinafter referred to as LM devices) have been increasingly used on the sliding surfaces of machine tools. In this case, the corresponding LM
An important issue is how to accurately position and fix the device on the machine tool.

For example, a conventional LM device that is positioned and fixed on the bed of a machine tool is as follows.

In FIG. 1, a groove 2 having a generally U-shaped cross section is formed in the bed 1, and this groove 2 extends in the longitudinal direction of the bed 1. 4 is the rail 5 in this groove 2
The bottom surface 6 and rear surface 7 of this rail (hereinafter referred to as LM guide 5) are in close contact with the seating surface 8 and positioning surface 9 of the groove 2, respectively. The fixing surface 10 on the front side of the LM guide 5 has the groove 2
A small groove 12 is defined along the wall surface 11 at a predetermined distance from the remaining wall surface 11 . A fixing plate 13 having a substantially rectangular cross section is fitted into the small groove 12 and fixed to the bed 1 with bolts 14.
When positioning and fixing such a conventional LM device, the fixing plate 1 is adjusted so that the LM guide 5 is seated in the groove 2 and the fixing plate 13 is fitted into the small groove 12 without too much or too little.
The current method is used, which involves cutting the width of 3, etc. This current processing requires advanced processing technology, and there is also the problem that drilling a screw hole in the bed 1 for screwing the bolt 14 requires labor and man-hours.

FIG. 2 shows the positioning and fixing structure of another conventional LM device. In the figure, the wall surface 15 of the small groove 12 is inclined toward the fixing surface 10 in the direction of the seating surface 8, so that the cross section of the small groove 12 is approximately trapezoidal, narrowing downward in the figure. Small groove 12
A fixing plate 16 having a substantially trapezoidal cross section is fitted into the fixing plate 16 and fixed with bolts 14 . By tightening the bolt 14, a small groove 1 is formed in the fixing plate 16 by a wedge action.
2, and the LM guide 5 is fixed to the bed 1.

Furthermore, FIG. 3 shows the positioning and fixing structure of another conventional LM device. In the figure, a groove 2 having a width slightly larger than the width of the LM guide 5 is previously formed in the bed 1, and a plurality of through screw holes 17 perpendicular to the fixing surface 10 of the LM guide 5 are provided in the bed 1. Then screw 19 into this screw hole 17.
By screwing in, the end face is brought into pressure contact with the fixing surface 10, and the LM guide 5 is fixed to the bed 1. However, this structure has the problem that a plurality of relatively long screw holes 17 must be drilled in the bed 1, which requires a lot of man-hours.

Furthermore, a common drawback of the conventional examples 1 and 2 above is that machine tools originally
In this case, the remaining wall thickness (width in the left-right direction in the figure) of the bed 1 is particularly small, so the fixed part 3 is less susceptible to the load force applied during machining. There was a problem that strength was not guaranteed.

This idea was devised by focusing on these conventional problems. A pressure contact force transmission means is provided in the LM guide, and the LM device is attached to the bed by pressure contacting the wall surface of the fixed part of the bed from the LM guide side. The object is to solve the above problems by fixing the position.

This invention will be explained below based on the drawings. Fourth
The figure shows a first embodiment of this invention. In the figure, 21 is a bed as a base of the machine tool, and the bed 21 has a groove 22 with a substantially rectangular cross section extending in the longitudinal direction. It is formed. This groove 2
2 is defined by a seating surface 23 and a positioning surface 24 and a fixing surface 25 facing each other on both sides thereof.
20 is a linear motion bearing device that is positioned and fixed to this bed 21 via a groove 22, and this LM device 20 includes an LM guide 26 that is fitted into the groove 22 over its entire length, and an LM guide 26 that is mounted on the LM guide 26. It consists of a slide portion 28 that is slidably mounted via a bearing 27. A spindle head (not shown) or the like can be attached onto this slide portion 28. The LM guide 26 is the base 2
9, the base 29 has a bottom surface 30 that contacts the seating surface 23 of the groove 22, a rear end surface 31 that contacts the positioning surface 24, and a front end surface 32 that faces the fixing surface 25 at a predetermined distance apart. ing.

A vertical hole 33 is perpendicularly perpendicular to the bottom surface 30 from approximately the center of the upper end surface of the LM guide 26, and a thread is cut at the upper end of the vertical hole 33. The base 29 has an opening at the front end surface 32 and a fixing surface 25 (groove 2
A plurality of horizontal holes 34 are perpendicular to the side wall of No. 2) and the vertical hole 33 and communicate with the vertical hole 33.

A cylindrical sliding member 43 is slidably abutted on the lower end surface of the screw 39. An annular groove 44 is formed in the middle part of the sliding member 43, and an O
A ring 45 is fitted. Also, multiple horizontal holes 34
Plunger 4 as a pressure contact member inserted inside
An annular groove 47 is also formed in the middle part of 6, and an O-ring 48 is fitted into this groove 47. Hydraulic oil 49 is provided between the plunger 46 and the sliding member 43.
The O-rings 45 and 48 prevent this hydraulic oil 49 from leaking from between the plunger 46 and the sliding member 43 to the screw 39 and the fixing surface 25 side. By tightening the screw 39, the pressing force is applied to the plunger 46 via the hydraulic pressure to the fixed surface 2.
5, the LM guide 26 is fixed to the bed 21.

FIG. 5 and FIG. 6 are diagrams showing the second embodiment.

Holes 50 that communicate with the plurality of horizontal holes 34 provided in the LM guide 26 are provided along the longitudinal direction of the LM guide, and a plunger screw 53 can be adjusted to close the holes 50 that communicate with the ends of the LM guide. They are screwed together.

That is, since the hole 50 containing the hydraulic oil 49 communicates with the plurality of horizontal holes 34 and 51, pressure can be applied evenly to the plurality of plungers 46 by adjusting the one plunger screw 53.

Next, the effect will be explained.

The base 29 of the LM guide 26 is fitted into the groove 22, and the screw 39 is screwed in. The driving force of the screw 39 presses the sliding member 43 downward in the figure. This propulsive force generates a component force that pushes the plunger 46 in the horizontal direction by the hydraulic oil 49. Due to this horizontal component force, one end surface 46a of the plunger 46
Pressure contact with 5. Therefore, the rear end surface 3 receives the reaction force.
1 is in pressure contact with the positioning surface 24.

As explained above, according to this invention, by making the positioning and fixing means built into the LM guide, the relatively lightweight LM guide side can be machined at the factory stage by simply machining grooves on the bed of the machine tool. The advantage is that it can be assembled quickly and accurately. Furthermore, since the width of the fixed portion can be increased, safety is greatly improved in terms of strength.

[Brief explanation of the drawing]

1 to 3 are sectional views of a conventional linear motion bearing device, FIG. 4 is a sectional view showing a first embodiment of the linear motion bearing device of this invention, and FIG. 5 is a sectional view of a second embodiment of the linear motion bearing device of this invention. FIG. 6 is a sectional view taken along line AA in FIG. 5. 20...linear motion bearing device,
(LM device) 21... bed (base), 22...
Groove, 25... Fixed surface (side wall), 26... LM guide, 29... Base, 33... Vertical hole, 34... Horizontal hole, 35... Plunger, 39... Screw, 43
...Sliding member, 46...Plunger, 49...
Hydraulic oil, 50...hole, 51...horizontal hole, 53...plunger screw.

Claims (1)

[Scope of utility model registration request] In a linear motion bearing device disposed on a guide surface on a base, a rail of the linear motion bearing device, a groove with a rectangular cross section formed on the base to fit the rail, a plurality of horizontal holes that are orthogonal to the side walls of the groove and open in that direction; a pressure contact member that is slidably fitted into the plurality of horizontal holes; and a threaded portion that is bored in a direction that is perpendicular to the plurality of horizontal holes and is provided at the opening end. a vertical hole provided with a vertical hole, a pressure contact force transmitting means made of a liquid sealed between the plurality of horizontal holes and the vertical hole, and a screw member screwed into a threaded portion of the vertical hole, and the pressure contact is achieved by screwing the screw member. A linear motion bearing device that fixes the rail to a bed by constantly pressing the pressure contact member against the side wall of the groove through a force transmission means.