A device for improving the error tolerance of closed hydrostatic guide rail

Abstract

The utility model discloses a device for improving the tolerance of closed static pressure guide rail itself. The misalignment value of the plane of the oil chamber of the fixed and movable guide rails caused by the plane error of the fixed guide rail plate and the warping of the movable guide rail is C. The maximum pressure difference generated by the upper and lower oil chambers of the static pressure guide rail unit is F. Under the action of the F force, the static pressure unit generates elastic displacement relative to the movable guide rail surface, and the elastic displacement value is greater than or equal to C. Spacing grooves of each opposed static pressure unit or weakening grooves of each opposed static pressure unit relative to the movable guide rail panel are provided, so that each static pressure unit generates elastic displacement relative to the movable guide rail panel under the action of the pressure difference of the opposed oil chambers. Compared with the movable guide rail as a rigid body, the tolerance of the closed static pressure guide rail itself is improved, so that the closed static pressure guide rail is easier to manufacture, assemble and use.

Description

Technical Field

[0001] The present invention relates to the technical field of guide rails, and in particular to a device for improving the error tolerance of a closed hydrostatic guide rail. Background Art

[0002] Closed hydrostatic guides have superior performance, but are not widely used due to their relatively difficult manufacturing. The main difficulty lies in the control of the oil film gap between the fixed guide and the moving guide. Figure 1 As shown, there is an oil film gap value between the fixed guide plate and the moving guide, and the gap values ​​of the two oil chambers are X and Y respectively. In theory, the initial values ​​of X and Y are consistent, generally 0.02mm. Since the moving guide surface (4 surfaces in the figure) is connected to several groups of opposing static pressure units and serves as a workbench, the area is relatively large. During the manufacturing and assembly process, the surface is prone to warping, causing the X and Y values ​​of each static pressure unit to change. When the surface warps and causes the X and Y values ​​to change by more than or equal to 0.02mm, the relative warping of surface A relative to the fixed guide plate during the manufacturing, assembly and use of the closed static pressure guide must be controlled within a very small range. CN111590341A proposes a solution to this problem, but the solution has a complex structure and requires a set of components in each oil chamber, which increases the cost, and its own failure will directly cause the guide rail to fail. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a device for improving the error tolerance of the closed hydrostatic guide rail itself, which can effectively solve the deficiencies in the prior art.

[0004] The present invention is achieved through the following technical scheme: a device for improving the error tolerance of a closed hydrostatic guide rail, a spacing groove is set between each opposing hydrostatic unit, the plane misalignment value of the fixed and movable guide rail oil chamber caused by the plane error of the fixed guide rail plate and the warping of the movable guide rail is C, the maximum pressure difference generated by the upper and lower oil chambers of the hydrostatic guide rail unit is F, and under the action of the F force, the hydrostatic unit produces an elastic displacement relative to the movable guide rail surface, and the elastic displacement value is greater than or equal to C.

[0005] As a preferred technical solution, a weakening groove is provided for each opposing static pressure unit relative to the moving guide rail panel.

[0006] The beneficial effects of the present invention are as follows: the utility model is provided with spacing grooves between the opposing static pressure units or weakening grooves between the opposing static pressure units relative to the moving guide rail panel, so that each static pressure unit generates elastic displacement relative to the moving guide rail panel under the action of the pressure difference in the opposing oil chambers, and the error tolerance of the closed static pressure guide rail itself is improved relative to the moving guide rail as a rigid body, making the closed static pressure guide rail easier to manufacture, assemble and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 It is a schematic diagram of the clearance value of a conventional closed hydrostatic guide rail of the present invention;

[0009] Figure 2 A top view of a commonly used moving guide rail plate of a conventional closed hydrostatic guide rail of the present invention;

[0010] Figure 3 It is a front view of a commonly used moving guide rail plate of a conventional closed hydrostatic guide rail of the present invention;

[0011] Figure 4 A schematic diagram of a critical value of a clearance change of a conventional closed hydrostatic guideway of the present invention;

[0012] Figure 5 It is a schematic diagram of elastic displacement of the hydrostatic guide rail unit of the present invention;

[0013] Figure 6 It is a schematic diagram of the spacing groove of the hydrostatic guide rail unit of the present invention;

[0014] Figure 7 It is a front view of the spacing groove of the static pressure guide rail unit of the present invention;

[0015] Figure 8 It is a schematic diagram of the weakening groove of the static pressure guide rail unit spacing groove of the present invention;

[0016] Fig. 9 It is a front view of the spacing groove weakening groove of the static pressure guide rail unit of the present invention;

[0017] Fig.10 It is a schematic diagram of thinning the panel of the static pressure guide rail unit spacing groove weakening groove of the present invention;

[0018] Fig.11 It is a front view of the thinning of the panel of the static pressure guide rail unit spacing groove weakening groove of the present invention;

[0019] Fig.12 It is a schematic diagram of the static pressure guide rail unit spacing groove weakening groove panel thinning spacing groove plus weakening groove of the present invention;

[0020] Fig.13 It is a front view of the static pressure guide rail unit spacing groove weakening groove panel thinning spacing groove plus weakening groove of the present invention;

[0021] Fig.14 It is a schematic diagram of the spacing groove plus weakening groove of some hydrostatic guide rail units of the present invention;

[0022] Fig.15 It is a schematic diagram of the dislocation of the present invention; Description of the drawings:

[0024] 1. Bed; 2. Fixed guide plate; 3. Moving guide; 4. Moving guide surface; 5. Upper oil film gap x; 6. Lower oil film gap y; 7. Upper oil film gap x-δmax at the critical value of maximum displacement; 8. Lower oil film gap y+δmax at the critical value of maximum displacement; 9. Upper and lower oil film pressure difference F at the critical value of maximum displacement; 10. Maximum elastic displacement value of the hydrostatic guide unit relative to the moving guide surface at the maximum pressure difference F; 11. Top view of the oil chamber; 12. Front view of the oil chamber; 13. Hydrostatic guide unit spacing groove; 14. Hydrostatic guide unit and dynamic guide panel main body weakening groove; 15. Misalignment value C; DETAILED DESCRIPTION

[0025] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0026] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0027] Example 1

[0028] like Figure 1-Figure 15 As shown, the normal static pressure guide rail is as follows Figure 1 As shown, after bearing the load Figure 4 As shown, there are also Fig.15 As shown, the warping of the movable guide rail 3 causes the fixed guide rail plate 2 and the movable guide rail 3 to be misaligned, and the misalignment value is C. At this time, the guide rail cannot be assembled and work normally, such as Fig.12 and Fig.13 As shown, each hydrostatic guide rail unit has an oil chamber facing up and down. Fig.11 There are static pressure guide rail unit spacing grooves 13 between each static pressure guide rail unit, and static pressure guide rail unit and dynamic guide rail panel body weakening grooves 14 are opened. The single-side clearance value of the static pressure unit is 0.02mm, and the maximum pressure difference between the upper and lower oil chambers is 4000N. Under normal circumstances, the maximum allowable relative warping between the fixed and dynamic guide rails of the static pressure guide rail is 0.02mm. When this value is exceeded, the static pressure unit fails. Fig.13 As shown in the figure, after the weakening groove is opened, under the pressure of 4000N, Figure 5 The elastic displacement value of the 10 hydrostatic units shown is determined to be 0.04 mm through experiments, so that when the maximum relative misalignment value C of the hydrostatic guide rail and the movable guide rail relative to each other reaches 0.04 mm, the group of hydrostatic guide rail units will not fail.

[0029] Example 2

[0030] like Fig.14 As shown, the difference from Example 1 is that three groups of static pressure units do not have weakening grooves, while the rest have weakening grooves.

[0031] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A device for improving the error tolerance of a closed hydrostatic guide rail, characterized in that: A spacing groove is set between each opposing static pressure unit. The plane misalignment value of the fixed and movable guide rail oil chamber caused by the plane error of the fixed guide rail plate and the warping of the movable guide rail is C. The maximum pressure difference generated by the upper and lower oil chambers of the static pressure guide rail unit is F. Under the action of the force F, the static pressure unit produces elastic displacement relative to the movable guide rail surface, and the elastic displacement value is greater than or equal to C.

2. The device for improving the error tolerance of the closed hydrostatic guide rail according to claim 1 is characterized in that: A weakening groove is provided for each opposing static pressure unit relative to the moving guide rail panel.

Images