SK278311B6 - System for guiding of the slide - Google Patents

Abstract

On the basic body (10), there are fixed the guide edges (12) used for guiding of the slide (11). The support space (22) is used for the precise leading closed to each of the guiding edges (12), this space is equipped with one plastic cover (20,21) which was sprayed around the guiding edge (12). To prevent the deformation and the damage, when the slide (11) are mounted on and dismounted of the guide edges (12), the outer plane of the side cover (20) and the side plate of the guiding edge (12) put on it, form the angle with the outer side (23) of the guiding edge (12) in the maximum value of 10 degrees.

Description

Guides (12) for guiding the carriage (11) are fastened to the base body (10) of the assembly. For accurate guidance, the receiving space (22) for each guide rail (12) is provided with at least one plastic coating (20, 21) which has been sprayed around the guide rail (12). To prevent deformation and damage when the slide (11) is attached to the guide rails (12), the outer surface of the side coating (20) and the side surface of the guide rail (12) and the outer side (23) of the guide rail (12) (a) which is at most 10 °.

Technical field

The invention relates to a slide guide assembly having a base body carrying parallel guide rails and a slide which is slidable on the guide rails and provided with 5 for each of them a bearing surface of which at least one side is coated with plastic.

BACKGROUND OF THE INVENTION 10

Such slide guidance systems are used, for example, in machine tools where the slide must be guided with high accuracy along the axis of the machine tool. Precondition for accurate guidance is a rigid guide assembly and a precise fit between each of the guide rails and the respective bearing surface. It is known that in the guide assembly it is possible to make one guide bar flat and the other guide bar with a triangular cross-section so that the slide can flex laterally upward in the event of thermal expansion or misalignment. This will prevent parts from clamping in the system due to uneven thermal expansion of system components or other dimensional differences, but the accuracy of the linear guide will deteriorate because of movements perpendicular to the direction of the guide.

To fit, between the receiving space and the guide rail, in a known manner, the bearing surface is first produced with an overlap and the guide rail is inserted into the bearing surface. The remaining space in the bearing surface is then sprayed with plastic, the surface of the guide bar being first coated with an anti-adhesion agent. In this way, one or more walls of the receptacle are coated with plastic so that the cross-section of the receptacle is precisely matched to the cross-section of the guide rail. It is known to arrange 35 adjustable thrust mechanisms in the receptacle so that the guide bar is pressed precisely and in a defined manner on the surface opposite the thrust mechanism.

In known slide guidance systems where at least one of the storage surfaces is coated with plastic 40, there is a problem that the coating often becomes damaged when the guide bar is extended. Such damage to the coating results in inaccurate guidance.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION The object of the present invention is to improve the slide guide assembly so as to ensure that the shape of the receptacle conforms precisely to the shape of the guide rail so that there are no deviations in the guide in any direction that does not coincide with the guide direction.

A slide guide assembly comprising a base body equipped with parallel rails and a slide that is slidable over the guide rails and provided with a storage space for each of them having at least one side surface coated with a plastic coating according to the invention, the outer surface of the lateral coating and the lateral surface of the guide rail disposed thereon at an angle of at most 10 [deg.] with the outer side 60 of the guide rail.

By sloping the outer surface of the coating and the lateral surface of the guide rail, it is achieved that after the coating has been formed the slide can be easily removed from the guide rail without damaging the plastic layer or deforming it. Thus, the bevel serves to facilitate removal of the mold from the plastic coating that is produced in space. When operating the guide system on the carriage, the bevel does not disturb, as its angle is so small that it acts confidently against the lateral forces. There is therefore no danger of the sled being lifted from the guide rails by the side forces. Furthermore, the solution according to the invention allows easy mounting of the carriage on guide rails which have a centering effect due to the bevel when, for example, the carriage is placed on the base body by a crane.

After removal of the slide from the guide rails, after the coating has been formed, the outer surface of the coating must be further worked. Since, when spraying plastics, the outer surface of the coating is planar and exactly matches the outer surface of the guide bar, a gap could not be formed to form a lubricant film without such subsequent processing. Therefore, lubrication grooves or other recesses must be formed in the outer surface of the coating.

The bevel angle depends on the elastic properties of the co-picking materials taking into account the effect of the lubricant. A bevel angle of 4 to 5 ° is sufficient to remove the plastic by pulling out the guide bar.

A slide guide system in which two parallel guide rails are guided as in the solution according to the invention forms a statically predetermined system. In order to prevent parts from being clamped in such a system, it must be ensured that elastic deformations are created on the base body, or in particular on the carriage, by means of which the respective component of the resulting clamping forces can be absorbed. In the known slide guidance systems, only one of the guide rails always ensures accurate guidance, while the other guide rail has the necessary play. The slide guide assembly according to the invention makes it possible to create very narrow tolerances and guides virtually free of play on both guide rails. The system is suitable for guiding in all axes X, Y, Z of a machine tool. The base body does not necessarily have to be stationary, but can itself consist of a carriage which is guided over another base body.

The advantage of the carriage guide system according to the invention lies in particular in the rigid guide. Since there are few contact surfaces between the guide rails and the carriages, on which the materials rest on each other, the system ensures a high guide stiffness. It is known that the contact surfaces always give a certain flexibility.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail below with reference to the accompanying drawing, in which: FIG. 1 schematically shows a side view of a slide guide assembly and FIG. 2 is an enlarged cross-sectional view of the guide rail and its surroundings.

DETAILED DESCRIPTION OF THE INVENTION

In the drawing, the base body 10 is shown, after which it can slide in the longitudinal direction of the carriage 11. The base body 10 has two parallel guide bars 12 on the upper side, which have a constant, substantially rectangular cross section along its entire length. The guide rails 12 are arranged horizontally in the embodiment shown, their width in the horizontal direction being greater than the height in the vertical direction. Each of the two guide rails 12 is mounted on a bracket 13 that extends upwardly from the base body 10, and each guide rail 12 extends across the bracket 13 towards the opposite rail 12. A pressure mechanism 14 mounted on the overhanging portion of the rail 12 engages from below. The second adjustable pressure mechanism 15 on the carriage 11 pushes from the outside of the carriage 11 onto the outer side surface of the guide bar 12.

Each of the two adjustable thrust mechanisms 14, 15 consists of a body 16 in which the rollers 17 are guided by pressing against the outside of the guide bar 12. The rollers 17 that roll in the body 16 are guided on the return path 18 so that they then roll again on the outside of the guide rail 12. The body 16 is pressed by a wedge device 19 consisting of two mutually adjustable wedges to the outside of the guide rail 12.

While the lower thrust mechanism 14 abuts a portion of the underside of the guide rail 12, the side thrust mechanism 15 is pressed against the outer side surface of the guide rail 12.

The two other surfaces of the guide rail 12, i.e. the upwardly facing side and the top side, engage the coatings 20, 21 that form two adjacent walls of the carriage storage space 11. The side coating 20 lies opposite the side thrust mechanism 15 and the side coating 21 against the bottom thrust During the manufacture of the coatings 20, 21, the receptacle 22 on the carriage 11 initially overlaps the guide bar 12, the walls of the receptacle 22 being intentionally rough, for example with a roughness of about 0.5 mm. Then, the guide bar 12 is adjusted to the exact position in the receptacle 22. The guide bar 12 is fixedly connected to the base body 10 and the carriage 11 is held by a positioning device (not shown) in a defined position. The gaps that are constrained by the walls of the storage space 22 and the inner side wall and the upper side of the guide rail 12 are sprayed with plastic to form coatings 20, 21. In order to be able to pull the carriage 11 from the guide rails 12, The guide rails 12 are bevelled, i.e. they are not parallel to the outer side 23 of the guide rail 12, but instead form an angle [alpha] of about 4 [deg.]. This angle α is, for the sake of illustration, in FIG. 2 drawn substantially larger. Thus, the storage space 22 has a larger width on the open side facing the base body 10 than on the upper side.

When the coatings 20, 21 have hardened, the carriage 11 is removed from the guide rails 12 and, at the next post-treatment, the lubricant grooves 24 are formed in the coatings 20, 21. In addition, lubricating channels 25 are formed through which lubricant is fed to the surfaces to be lubricated.

FIG. 2, it is clear that the edges of the guide bar 12 are some distance from the coatings 20, 21 in order to avoid pinching wedge surfaces. Therefore, cords or other components are inserted into the area 26 around the edges of the guide rails 12 during the spraying of the plastic, which are removed after the coatings 20, 21 have been formed.

FIG. 2 it is further evident that the lower thrust mechanism 14 is supported by a bearing block 27 which is mounted on the underside of the carriage 11. The lower thrust mechanism 14 prevents the carriage 11 from being lifted away from the guide rail 12. It is located near the side coating 20 and pushes the guide rail 12 By such an arrangement of the lower thrust mechanism 14 it is achieved that the resulting heeling moments remain small and that the sanell with their coatings 20, 21 closely fit and abut the two guide surfaces of the guide rails 12.

Claims (7)

A slide guide assembly comprising a base body equipped with parallel rails and a slide which is slidable on guide rails and provided, for each of them, with a storage space, at least one side surface of which is coated with a plastic coating, characterized in that the outer surface of the lateral coating (20) and the lateral surface of the guide rail (12) disposed therein form an angle (α) of at most 10 ° with the outside (23) of the guide rail (12). An assembly according to claim 1, characterized in that only one of the side surfaces of the receptacle (22) is provided with a side coating (20) and the second surface is formed by a sliding surface of the pressing mechanism (15). Assembly according to one of claims 1 and 2, characterized in that the base of the storage space (22) is provided with an upper coating (21). Assembly according to one of Claims 1 to 3, characterized in that each coating (20, 21) has lubricating grooves (24) on the outer surface. Assembly according to claims 3 or 4, characterized in that the guide bar (12) has a free lower surface on which the adjustable pressure mechanism (14) of the carriage (11) is applied. Assembly according to claim 5, characterized in that the guide bar (12) mounted on the bracket (13) of the base body (10) extends through the bracket (13) towards the longitudinal plane of symmetry of the base body (10) and the lower one. the pressing mechanism (14) is arranged near the side coating (20) located on the side of the storage space (22). Assembly according to one of Claims 1 to 6, characterized in that the two lateral surfaces of the receptacle (22) are provided with a coating (20, 21) and a bevel is provided on both lateral surfaces.