Hydrostatic profiled rail guide

Abstract

A hydrostatic profiled rail guide, having a guide carriage (2) which is arranged on a guide rail (1) so as to be longitudinally slidable and is hydrostatically mounted on said guide rail, wherein the guide carriage has pressure pockets and pocket surfaces arranged around the pressure pockets, and wherein the guide rail on the faces thereof facing towards the pressure pockets has rail running surfaces (7) for hydrostatic mounting of the guide carriage on the guide rail, wherein the pocket surfaces formed on the guide carriage have a first coating formed of a Cu/Sn alloy.

Claims

1. A hydrostatic profiled rail guide comprising a hydrostatically supported guide carriage arranged to slide longitudinally on a guide rail, the guide carriage includes pressure pockets and pocket surfaces arranged around the pressure pockets, and rail running surfaces are located on sides of the guide rail that face the pressure pockets for hydrostatic support of the guide carriage on the guide rail, and the pocket surfaces formed on the guide carriage are provided with a layered structure comprising a first coating formed of a Cu/Sn alloy and a second coating made from Cu, the second coating being deposited on a supporting body of the guide carriage and the first coating being deposited directly on the second coating.

2. The hydrostatic profiled rail guide according to claim 1, wherein whose Cu/Sn alloy is made from Cu with 12 to 14 weight percent Sn.

3. The hydrostatic profiled rail guide according to claim 1, wherein the first coating is deposited galvanically.

4. The hydrostatic profiled rail guide according to claim 1, wherein the first coating is an outermost layer of the layered structure such that the first coating forms an exposed portion of the pocket surfaces.

5. The hydrostatic profiled rail guide according to claim 1, wherein the first coating has a layer thickness which is greater that a layer thickness of the second coating.

6. The hydrostatic profiled rail guide according to claim 5, wherein the layer thickness of the first coating is in the range of 10-13 m and the layer thickness of the second coating is in the range of 3 to 5 m.

7. The hydrostatic profiled rail guide according to claim 1, wherein the supporting body is formed from steel with the pocket surfaces formed on the supporting body, wherein the second coating is deposited directly on the steel of the supporting body.

8. The hydrostatic profiled rail guide according to claim 7, wherein the first coating and the second coating together have a layer thickness from 14 m up to and including 16 m.

9. The hydrostatic profiled rail guide according to claim 7, wherein the second coating is deposited galvanically.

10. A method for producing a hydrostatic profiled rail guide according to claim 7, comprising galvanically depositing the second coating from copper and galvanically depositing the first coating from Cu/Sn on the second coating.

11. A method for producing a hydrostatic profiled rail guide comprising a hydrostatically supported guide carriage arranged to slide longitudinally on a guide rail, the guide carriage including pressure pockets and pocket surfaces arranged around the pressure pockets, and rail running surfaces located on sides of the guide rail that face the pressure pockets for hydrostatic support of the guide carriage on the guide rail, the method comprising: galvanically depositing a first coating formed of a Cu/Sn alloy on the pocket surfaces and then grinding the first coating in a grinding process.

12. The method according to claim 11, wherein the galvanically deposited first coating has a layer thickness that is greater than 15 m, and the first coating is ground so that a total layer thickness of 14 m to 16 m is set.

13. The method according to claim 12, further comprising galvanically depositing a second coating on a supporting body of the guide carriage before the depositing of the first coating directly on the second coating, and said total layer thickness includes a layer thickness of the second coating.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below with reference to an embodiment shown in four figures. Shown are:

(2) FIG. 1 a hydrostatic profiled rail guide according to the invention in perspective view,

(3) FIG. 2 a cross section through the hydrostatic profiled rail guide according to FIG. 1,

(4) FIG. 3 in a schematic diagram, a coating structure of the guide carriage of the profiled rail guide according to the invention, and

(5) FIG. 4 in a schematic diagram, a longitudinal section of a hydrostatic profiled rail guide according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(6) The hydrostatic profiled rail guide shown in the two figures has a guide carriage 2 guided on a guide rail 1 so that it can move longitudinally. The guide carriage 2 has a back 3 and legs 4 that are arranged on its two longitudinal sides along the guide rail 1 and with which the guide carriage 2 partially wraps around the guide rail 1.

(7) The guide carriage 2 is made essentially from a supporting body 5 formed from steel and from two head pieces 6 arranged on the two end sides of the supporting body 5. Not-shown hoses through which hydraulic fluid is pumped are connected to the head pieces 6. The hydraulic fluid is guided via channels not shown in more detail and provided in the interior of the guide carriage 2 in order to form a hydrostatic pressurized cushion between the guide carriage and the guide rail.

(8) FIG. 4 show, in a longitudinal section, the disclosed guide rail 1 and the guide carriage 2 supported hydrostatically on this rail. The guide rail 1 is provided with rail running surfaces 7. The supporting body 5 is provided on its sides facing the rail running surfaces 7 with pressure pockets 13 in which pressurized hydraulic fluid is provided. The hydraulic fluid is led via the pressure lines 14 into the pressure pockets 13. The pressure pockets 13 are surrounded by pocket surfaces 8 that define bearing gaps 15 together with the rail running surfaces 7.

(9) FIG. 2 shows, in cross section, the pocket surfaces 8 of the guide carriage 2 and the rail running surfaces 7 of the guide rail 1. FIG. 2 shows, in total, four rail running surfaces 7, two on the rail top side, two on the rail bottom side, and corresponding pocket surfaces 8. Of each of these pocket surfaces 8, several surfaces can be arranged one behind the other along the longitudinal axis of the guide rail 1.

(10) Of the four pocket surfaces 8 formed on the supporting body 5 of the guide carriage 2, two are formed on the side of the back 3 facing the guide rail 1 and two are formed, one on each of the two legs 4 on its side facing the guide rail 1.

(11) The supporting body 5 formed from steel is coated in the area of its pocket surfaces 8. FIG. 3 shows schematically the layer structure: the pocket surface 8 itself is formed by a first coating 10 that is formed from a Cu/Sn alloy. This first coating 10 is deposited galvanically on a second coating 11 made from copper. This second coating 11 is deposited galvanically on the steel of the supporting body 5.

(12) The pressure pockets 13 and the pocket surfaces 8 are provided in the embodiment with the coatings according to the invention. Alternatively it is conceivable to cover the pressure pockets so that only the pocket surfaces 8 are coated.

(13) The layer thickness s2 of the second coating 11 equals between 3 to 5 m. The layer thickness s1 of the first coating 10 equals 10 to 13 m. Both coatings together have a layer thickness of 15 m+/1 m.

(14) The total layer thickness can be significantly greater than 15 m. In this case, the second coating is ground until a specified gap dimension between the guide carriage 2 and the guide rail 1 is set without any problems.

LIST OF REFERENCE NUMBERS

(15) 1 Guide rail 2 Guide carriage 3 Back 4 Leg 5 Supporting body 6 Head piece 7 Rail running surface 8 Pocket surface 9 - 10 First coating 11 Second coating 12 - 13 Pressure pocket 14 Pressure line 15 Bearing gap