Closed hydrostatic guideway suitable for non-uniform temperature field

Abstract

The invention discloses a closed hydrostatic guideway adaptive to a non-uniform temperature field, which consists of a fixed guideway and a movable guideway, an oil cavity is arranged on the movable guideway, the oil cavity is symmetrically arranged relative to the fixed guideway, a fixed gap is arranged between the fixed guideway and the movable guideway and is the thickness of an oil film, and a fixed guideway plate for bearing load in the width direction is arranged on the fixed guideway. The movable guide rail oil cavities are arranged on two sides of the fixed guide rail plate. The distance between the two oil cavities between the fixed guide rail and the movable guide rail in the load width direction is controlled, so that when the static pressure guide rail is used at the designed limiting temperature, the maximum variation of the gap between the fixed guide rail and the movable guide rail does not exceed the designed allowable value, and when the gap between the fixed guide rail and the movable guide rail changes within the designed allowable value range, normal use of the closed static pressure guide rail is not affected.

Description

Technical Field

[0001] The invention relates to the field of hydrostatic guide rails, and in particular to a closed hydrostatic guide rail capable of adapting to uneven temperature fields. Background Art

[0002] It is very common for existing closed hydrostatic guide rails to get stuck due to excessive temperature rise or uneven temperature of the movable and fixed guide rail beds. Patent "CN10369234813" provides a method for setting a damping piston to automatically adjust the gap between the fixed and movable guide rails to address this problem. However, this method has three problems. First, the structure is complex. Second, a hydrostatic oil chamber is formed between the damping piston and the movable guide rail, and the area of ​​the damping piston is much larger than that of the fixed guide rail, which greatly reduces the rigidity of the hydrostatic guide rail. Third, the damping device will have hydraulic oil stains after long-term use, and the deposition will cause the damping to fail, thereby causing the hydrostatic guide rail to fail. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a closed hydrostatic guide rail that adapts to uneven temperature fields, which can effectively solve the deficiencies in the prior art.

[0004] The present invention is realized through the following technical scheme: a closed static pressure guide rail adapting to uneven temperature field, consisting of a bed and a moving guide rail, the bed having a fixed guide rail plate in height direction, the moving guide rail having a corresponding oil cavity, a fixed gap between the fixed guide rail plate and the moving guide rail, and the fixed gap is the oil film thickness, characterized in that: a fixed guide rail plate for bearing width direction load is arranged on the bed guide rail, the moving guide rail oil cavity is arranged on both sides of the fixed guide rail plate, and a fixed gap is provided between the fixed guide rail plate and the moving guide rail, and the fixed gap is the oil film thickness.

[0005] As a preferred technical solution, L = distance between two opposing oil chambers, α = thermal expansion coefficient of material, △L = maximum allowable change in single-side clearance of fixed and movable guide rails, △T = temperature difference change of fixed and movable guide rails, α = thermal expansion coefficient of fixed and movable guide rails, the materials of movable guide rails and bed are consistent.

[0006] As a preferred technical solution, L = distance between two opposing oil chambers, △L = maximum allowable change in single-sided clearance of fixed and movable guide rails, α1 = thermal expansion coefficient of movable guide rails, α2 = thermal expansion coefficient of bed frame, △T1 = deviation of movable guide rail from assembly temperature when in use, △T2 = deviation of bed from assembly temperature when in use, materials of movable guide rails and bed frame are inconsistent.

[0007] The invention discloses a closed static pressure guide rail which can adapt to uneven temperature field, and is composed of a bed and a moving guide rail. The bed is provided with a fixed guide rail plate in height direction, and a corresponding oil cavity is provided on the moving guide rail. There is a fixed gap between the fixed guide rail plate and the moving guide rail, and the fixed gap is the oil film thickness. The invention is characterized in that a fixed guide rail groove which bears the load in width direction is provided on the bed, and the moving guide rail is in the fixed guide rail groove. There are oil cavities on both sides of the moving guide rail, which respectively form static pressure oil cavities opposite to the two sides of the fixed guide rail groove, and there is a fixed gap between the fixed guide rail plate and the moving guide rail, and the fixed gap is the oil film thickness.

[0008] As a preferred technical solution, L = distance between two opposing oil chambers, α = thermal expansion coefficient of material, △L = maximum allowable change in single-side clearance of fixed and movable guide rails, △T = temperature difference change of fixed and movable guide rails, α = thermal expansion coefficient of fixed and movable guide rails, the materials of movable guide rails and bed are consistent.

[0009] As a preferred technical solution, L = distance between two opposing oil chambers, △L = maximum allowable change in single-sided clearance of fixed and movable guide rails, α1 = thermal expansion coefficient of movable guide rails, α2 = thermal expansion coefficient of bed frame, △T1 = deviation of movable guide rail from assembly temperature when in use, △T2 = deviation of bed from assembly temperature when in use, materials of movable guide rails and bed frame are inconsistent.

[0010] The beneficial effects of the present invention are as follows: the present invention controls the distance between the two oil chambers between the fixed and movable guide rails in the load width direction, so that when the hydrostatic guide rail is used at the design limit temperature, the maximum change in the gap between the fixed and movable guide rails does not exceed the design allowable value, and when the gap between the fixed and movable guide rails changes within the design allowable value range, it will not affect the normal use of the closed hydrostatic guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 It is a schematic diagram of a closed hydrostatic guide rail of the present invention;

[0013] Figure 2 It is a schematic diagram of a closed hydrostatic guide rail of the present invention;

[0014] Figure 3 It is a schematic diagram of a closed static pressure guide rail with a fixed guide rail plate that bears load in the width direction of the present invention;

[0015] Figure 4 It is a schematic diagram of a closed static pressure guide rail with a fixed guide groove that bears load in the width direction of the present invention;

[0017] 1. Bed; 2. Fixed guide plate in height direction; 3. Static pressure oil film in height direction; 4. Moving guide rail; 5. Fixed guide plate in width direction; 6. Oil chamber in width direction; 7. Static pressure oil film in width direction; 8. Fixed guide groove in width direction; 9. Moving guide plate; 10. Oil chamber in moving guide plate. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] Example 1

[0021] like Figure 3 As shown, there is a height-direction fixed guide rail 2 on the bed 1 and a height-direction static pressure oil film 3 between the moving guide rails. There is a width-direction fixed guide rail plate 5 on the bed 1, and there are width-direction oil chambers 6 on both sides of the moving guide rails 4. There is a fixed gap between the two, and the fixed gap is the width-direction static pressure oil film 7. The height-direction fixed guide rail plate 2 of the bed 1 and the width-direction fixed guide rail plate 5 of the moving guide rail 4 are made of steel, and the thermal expansion coefficient of the material is α=1.2*10 -5 / ℃, the maximum allowable change of the single-side clearance of the fixed and movable guide rails △L=±0.005mm, the temperature of the fixed guide rail is no more than 5℃ higher than that of the movable guide rail, △T=500, Taking L value = 60mm, the requirement is met, that is, the temperature difference between the fixed and moving guide rails is less than 5℃.

[0022] Example 2

[0023] like Figure 3 , Figure 4 As shown, the difference from Example 1 is that the bed material is natural granite, the height direction fixed guide plate 2 moving guide rail 4 width direction fixed guide rail plate 5 are made of steel, and the thermal expansion coefficient of natural granite is α2 = 0.3*10 -5 / ℃, thermal expansion coefficient of steel α1=1.2*10 -5 / ℃, the maximum allowable change of the single-side clearance of the fixed and movable guide rails is △L=±0.005mm. The assembly temperature of the machine tool is 25℃, the maximum operating ambient temperature is 40℃, and the temperature of the movable guide rail is no more than 5℃ higher than that of the bed. Take L=50mm.

[0024] Example 3

[0025] like Figure 3 As shown, there is a height-direction fixed guide rail 2 on the bed 1 and a height-direction static pressure oil film 3 between the moving guide rails. There is a width-direction fixed guide rail groove 8 on the bed 1, and a moving guide rail plate 9 connected to the moving guide rail 4 is in the middle. The surface of the moving guide rail plate 9 has a fixed guide rail plate oil cavity 10, and there is a fixed gap between the two, which is the width-direction static pressure oil film 7. The height-direction fixed guide rail plate 2 of the bed 1 and the width-direction fixed guide rail plate 5 of the moving guide rail 4 are made of steel, and the thermal expansion coefficient of the material is α=1.2*10 -5 / ℃, the maximum allowable change of the single-side clearance of the fixed and movable guide rails △L=±0.005mm, the temperature of the fixed guide rail is no more than 5℃ higher than that of the movable guide rail, △T=500, Taking L value = 60mm, the requirement is met, that is, the temperature difference between the fixed and moving guide rails is less than 5℃.

[0026] Example 4

[0027] like Figure 4 As shown, the difference from Example 3 is that the bed material is natural granite, the height direction fixed guide plate 2 moving guide rail 4 width direction fixed guide rail plate 5 are made of steel, and the thermal expansion coefficient of natural granite is α2 = 0.3*10 -5 / ℃, thermal expansion coefficient of steel α1=1.2*10 -5 / ℃, the maximum allowable change of the single-side clearance of the fixed and movable guide rails is △L=±0.005mm. The assembly temperature of the machine tool is 25℃, the maximum operating ambient temperature is 40℃, and the temperature of the movable guide rail is no more than 5℃ higher than that of the bed. Take L=50mm.

[0028] 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 closed static pressure guide rail adapted to uneven temperature field, consisting of a bed and a moving guide rail, the bed having a height-direction fixed guide rail plate, the moving guide rail having a corresponding oil cavity, a fixed gap between the fixed guide rail plate and the moving guide rail, the fixed gap being the oil film thickness, characterized in that: A fixed guide plate that bears the load in the width direction is set on the bed guide rail, and the movable guide oil chamber is arranged on both sides of the fixed guide plate. There is a fixed gap between the fixed guide plate and the movable guide, and the fixed gap is the oil film thickness.

2. The closed hydrostatic guide rail adapted to uneven temperature field according to claim 1 is characterized in that: L = distance between two opposing oil chambers, α = thermal expansion coefficient of material, △L = maximum allowable change in single-side clearance of fixed and movable guide rails, △T = temperature difference change of fixed and movable guide rails, α = thermal expansion coefficient of fixed and movable guide rails, the materials of movable guide rails and bed are consistent.

3. The closed hydrostatic guide rail adapted to uneven temperature field according to claim 1 is characterized in that: L = distance between two opposing oil chambers, △L = maximum allowable change in single-sided clearance of fixed and movable guide rails, α1 = thermal expansion coefficient of movable guide rails, α2 = thermal expansion coefficient of bed frame, △T1 = deviation of movable guide rail from assembly temperature when in use, △T2 = deviation of bed from assembly temperature when in use, materials of movable guide rails and bed frame are inconsistent.

4. A closed static pressure guide rail adapted to uneven temperature field, consisting of a bed and a moving guide rail, the bed having a height-direction fixed guide rail plate, the moving guide rail having a corresponding oil cavity, a fixed gap between the fixed guide rail plate and the moving guide rail, the fixed gap being the oil film thickness, characterized in that: A fixed guide rail groove that bears the load in the width direction is arranged on the bed. The moving guide rail is in the fixed guide rail groove. There are oil chambers on both sides of the moving guide rail to form opposite static pressure oil chambers on both sides of the fixed guide rail groove. There is a fixed gap between the fixed guide rail plate and the moving guide rail, and the fixed gap is the oil film thickness.

5. The closed hydrostatic guide rail adapted to uneven temperature field according to claim 4, characterized in that: L = distance between two opposing oil chambers, α = thermal expansion coefficient of material, △L = maximum allowable change in single-side clearance of fixed and movable guide rails, △T = temperature difference change of fixed and movable guide rails, α = thermal expansion coefficient of fixed and movable guide rails, the materials of movable guide rails and bed are consistent.

6. The closed hydrostatic guide rail adapted to uneven temperature field according to claim 4, characterized in that: L = distance between two opposing oil chambers, △L = maximum allowable change in single-sided clearance of fixed and movable guide rails, α1 = thermal expansion coefficient of movable guide rails, α2 = thermal expansion coefficient of bed frame, △T1 = deviation of movable guide rail from assembly temperature when in use, △T2 = deviation of bed from assembly temperature when in use, materials of movable guide rails and bed frame are inconsistent.

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