Method for guaranteeing motion precision of hydrostatic guideway of high-precision hard turning machine tool

Abstract

The invention discloses a method for guaranteeing the motion precision of a hydrostatic guideway of a high-precision hard turning machine tool. The method comprises the steps that a guideway large face and a 90-degree guideway face in a cross beam sliding base are combined and ground to meet the requirement; gaskets are padded on a large guide rail surface and a 90-degree guide rail surface of the cross beam sliding seat; all surfaces of inclined iron in the cross beam sliding seat and the lower pressing plate are combined and ground to required positions, the guide rail surface and the joint surface of the upper pressing plate are simultaneously combined and ground with the joint surface of the cross beam guide rail and the cross beam sliding seat, and the gasket is removed; inclined iron is installed according to the mark, and a loading tool is installed on the cross beam sliding seat; the large surfaces of the guide rails of the cross beam sliding seat are tightly attached to one side of the cross beam guide rail through the top-pull trough plate, measurement is conducted, and oil supply and recording are conducted after loosening; tightly attaching an upper pressing plate inner side binding guide rail surface and a lower pressing plate inclined iron guide rail surface of the cross beam sliding seat to the other side of the cross beam guide rail by utilizing a top pull trough plate, measuring, loosening, supplying oil, and recording; supplying oil to the hydrostatic guideway and adjusting the position of a driving shaft lead screw; the guide rail driving force of the crossbeam sliding seat is measured as required. The mounting precision and the movement precision of the hydrostatic guideway of the heavy high-precision hard turning machine tool can be guaranteed.

Description

Technical Field

[0001] The invention relates to a method for ensuring the motion accuracy of a static pressure guide rail of a high-precision hard turning machine tool, and belongs to the technical field of mechanical processing. Background Art

[0002] Hard turning refers to the process of turning hardened steel as the final processing or finishing process, replacing the commonly used grinding technology. It directly affects the production efficiency, cost, energy consumption and environmental protection. In order to ensure the motion accuracy and vibration resistance of heavy-duty vertical hard turning machine tools, the guide rails are hydrostatic guide rails, but the assembly of hydrostatic guide rails is difficult and the adjustment process is complicated.

[0003] At present, the assembly process method of the hydrostatic guide rails for heavy-duty high-precision vertical hard turning machine tools is to jointly grind the guide rails and adjust the pressure plates and transmission components, which can meet the motion accuracy of conventional hydrostatic guide rails. However, when the hydrostatic guide rails for heavy-duty high-precision vertical hard turning machine tools adopt this method, the motion accuracy cannot be guaranteed and the reliability is poor. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool, which can effectively ensure the installation accuracy and motion accuracy of the hydrostatic guide rail of a heavy-duty high-precision hard turning machine tool.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool, comprising the following steps: 1) Level the beam and place the guide rail of the beam facing upwards; 2) Jointly research the upper guide rail surface, lower guide rail surface and 90° guide rail surface in the crossbeam slide to meet the process requirements; 3) Arrange the guide rail of the beam downward, and place a gasket with a thickness of 0.03mm on the large surface of the upper guide rail, the large surface of the lower guide rail and the 90° guide rail of the beam slide seat. The gasket fits tightly with the guide rail on the beam; 4) The crossbeam is installed in the crossbeam slide, and the crossbeam slide and the 90° guide rail inclined iron and the lower pressure plate inclined iron placed in the lower pressure plate are jointly tested to meet the process requirements, the positions of the lower pressure plate inclined iron and the 90° guide rail inclined iron are marked, and the gaskets are removed; 5) The guide rail surface and the joint surface of the upper pressure plate are simultaneously ground together with the crossbeam guide rail and the crossbeam slide to meet the process requirements; 6) Separate the crossbeam from the crossbeam slide and pad the crossbeam firmly off the ground, press the marking position of the pressing plate inclined iron and the 90° guide rail inclined iron to fix the lower pressing plate inclined iron and the 90° guide rail inclined iron, and install the loading tooling on one side of the crossbeam slide; 7) Use the top groove plate to make the upper and lower guide rail surfaces of the crossbeam slide fit closely with one side of the guide rail of the crossbeam. At this time, suck the four dial gauge seats on the upper, lower, left and right positions of the crossbeam slide respectively. The needles touch the upper and lower large surfaces of the crossbeam guide rail and adjust to zero. Loosen the top groove plate and supply oil to the hydrostatic guide rail. At this time, the dial gauge value is the oil film thickness and the pressure of each hydrostatic oil chamber is recorded. 8) Use the top groove plate to make the upper pressure plate guide surface of the crossbeam slide and the guide surface of the lower pressure plate inclined iron fit closely with the other side of the guide rail of the crossbeam. At this time, suck the four dial gauge seats on the upper, lower, left and right positions of the crossbeam slide respectively, and the needle touches the upper and lower positions of the crossbeam guide surface and adjusts to zero. Release the top groove plate, and supply oil to the static pressure guide rail. At this time, the dial gauge value is the oil film thickness and the pressure of each static pressure oil chamber is recorded; 9) Supply oil to the hydrostatic guide rail and adjust the position of the drive shaft lead screw to ensure the correct position of the drive shaft under working conditions; 10) Measure the guide rail driving force of the beam slide as required.

[0006] Furthermore, two spaced apart brackets are provided on both sides of the loading tooling, and a horizontal screw is installed on the bracket, one end of the screw is fixedly connected to a plate body on one side of the top plate groove; on both sides of the bracket, two nuts are threadedly connected to the screw.

[0007] Furthermore, the opening of the upper top groove plate faces downward, and the opening of the lower top groove plate faces upward, and the guide rails on the upper and lower sides of the crossbeam are cooperatively installed in the openings of the upper and lower top groove plates.

[0008] The beneficial effects of the present invention are as follows: the present invention ensures the contact stiffness between the hydrostatic guide rail of a heavy-duty high-precision vertical hard turning machine and the upper pressure plate, the lower pressure plate bevel iron, and the 90° guide rail bevel iron oil film and accurately controls the guide rail gap by using high-precision gaskets, and detects and adjusts the oil film gap, pressure, and drive shaft screw position through preload tooling, thereby effectively ensuring the motion accuracy of the hydrostatic guide rail of a high-precision vertical hard turning machine; the method of the present invention is applied to a major provincial scientific and technological achievement transformation project, the project name is large series high-precision CNC double-column fixed-beam vertical lathe achievement transformation, the contract number is CG23017, and is suitable for ensuring the accuracy of the motion of the hydrostatic guide rail of a heavy-duty high-precision vertical hard turning machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] Figure 1 The present invention is a structural diagram of a heavy-duty high-precision vertical hard turning machine tool hydrostatic guide rail.

[0011] Figure 2 The invention discloses a schematic diagram of a static pressure guide rail pressure plate and an inclined iron joint grinding of a heavy-duty high-precision vertical hard turning machine tool.

[0012] Figure 3 It is a schematic diagram of a hydrostatic guide rail load fixture for a heavy-duty high-precision vertical hard turning machine tool of the present invention.

[0013] Numbers in the figure: 1. Crossbeam, 2. Crossbeam slide, 3. Upper guide rail large surface, 4. Lower guide rail large surface, 5. Gasket, 6. 90° guide rail surface, 7. Lower pressure plate oblique iron, 8. Upper pressure plate, 9. Lower pressure plate, 10. Top groove plate, 11. Loading tooling, 12. Screw, 13. Nut, 14. Bracket, 15. 90° guide rail oblique iron. DETAILED DESCRIPTION

[0014] like Figure 1 As shown in FIG. 3 , a method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool comprises the following steps: 1) Level the beam 1 and place the guide rail of the beam 1 facing upwards; 2) Jointly research the upper guide surface 3, the lower guide surface 4 and the 90° guide surface 6 of the crossbeam slide 2 to meet the process requirements; 3) Arrange the guide rail of the beam 1 downward, and pad the upper guide rail large surface 3, the lower guide rail large surface 4 and the 90° guide rail surface 6 of the beam slide 2 with a gasket 5 with a thickness of 0.03mm, and the gasket 5 fits tightly with the guide rail on the beam 1; 4) The crossbeam 1 is installed in the crossbeam slide 2, and the crossbeam slide 2 and the 90° guide rail inclined iron 15 and the lower pressing plate inclined iron 7 placed in the lower pressing plate 9 are grinded to the process requirements, the positions of the lower pressing plate inclined iron 7 and the 90° guide rail inclined iron 15 are marked, and the gaskets 5 are removed; 5) The guide rail surface and the joint surface of the upper pressure plate are simultaneously ground together with the crossbeam guide rail and the crossbeam slide to meet the process requirements; 6) Separate the crossbeam 1 from the crossbeam slide 2 and pad the crossbeam 1 off the ground, press the marking position of the pressing plate inclined iron 7 and the 90° guide rail inclined iron 15 to fix the lower pressing plate inclined iron 7 and the 90° guide rail inclined iron 15, and install the loading tooling 11 on one side of the crossbeam slide 2; 7) Use the top groove plate 10 to make the upper guide rail surface 3 and the lower guide rail surface 4 of the beam slide 2 fit closely with one side of the guide rail of the beam 1. At this time, the four micrometer gauge seats are sucked on the upper, lower, left and right positions of the beam slide 2 respectively. The needles touch the upper and lower large surfaces of the guide rail of the beam 1 and adjust to zero. Release the top groove plate 10, and the hydrostatic guide rail is supplied with oil. At this time, the micrometer value is the oil film thickness and the pressure of each hydrostatic oil chamber is recorded; 8) Use the top groove plate 10 to make the guide surface of the upper pressure plate 8 of the beam slide 2 and the guide surface of the lower pressure plate oblique iron 7 fit closely with the other side of the guide rail of the beam 1. At this time, the four micrometer gauge seats are sucked on the upper, lower, left and right positions of the beam slide 2 respectively, and the needles touch the upper and lower positions of the guide rail surface of the beam 1 and adjust to zero. Release the top groove plate 10, and the hydrostatic guide rail is supplied with oil. At this time, the micrometer value is the oil film thickness and the pressure of each hydrostatic oil chamber is recorded; 9) Supply oil to the hydrostatic guide rail and adjust the position of the drive shaft lead screw to ensure the correct position of the drive shaft under working conditions; 10) Measure the guide rail driving force of the beam slide 2 as required.

[0015] During operation, the upper pressure plate 8 and the lower pressure plate 9 are fixedly connected to the upper and lower ends of one side of the beam slide 2 respectively. The gasket 5 with a thickness of 0.03 mm in step 3) is used to ensure the oil film thickness of the static pressure guide rail; two spaced brackets 14 are arranged on both sides of the loading fixture 11, and a horizontal screw 12 is installed on the bracket 14, and one end of the screw 12 is fixedly connected to one side of the plate body of the top plate groove 10; on both sides of the bracket 14, two nuts 13 are threadedly connected to the screw 12; the opening of the upper top groove plate 10 faces downward, and the opening of the lower top groove plate 10 faces upward, and the guide rails on the upper and lower sides of the beam 1 are installed at the upper and lower ends. In the opening of the top groove plate 10; the top groove plate 10 in step 7) and step 8) is controlled by the nut 13 and the screw 12 to control its movement. In step 7), the nut 12 close to one side of the top groove plate 10 is loosened, and the screw 13 is pulled. The screw 13 drives the top groove plate 10 to move, so that one side of the guide rail of the beam 1 is tightly fitted with the upper guide rail surface 3 and the lower guide rail surface 4 of the beam slide 2; in step 8), the nut 12 away from the side of the top groove plate 10 is loosened, and the screw 13 is pushed. The screw 13 drives the top groove plate 10 to move, so that the other side of the guide rail of the beam 1 is tightly fitted with the guide rail surface of the upper pressure plate 8 and the guide rail surface of the lower pressure plate inclined iron 7.

[0016] A number of oil circuits are provided in the portion where the crossbeam slide 2 contacts the guide rail of the crossbeam 1. The oil circuits are connected to an external oil supply system, which supplies oil to the hydrostatic guide surface of the crossbeam 1 through the oil circuits to form a load-bearing oil film, so that the guide surfaces are in a state of pure liquid friction.

[0017] The method ensures the contact stiffness between the hydrostatic guide rail of a heavy-duty high-precision vertical hard turning machine and the oil film of the upper pressure plate 8, the lower pressure plate bevel iron 7, and the 90° guide bevel iron 15 by using a high-precision gasket 5, and accurately controls the guide rail clearance, and realizes the assembly process of the motion accuracy of the hydrostatic guide rail of a heavy-duty high-precision vertical hard turning machine by detecting and adjusting the oil film clearance, pressure, and drive shaft lead screw position through pre-loading tooling.

[0018] In order to ensure the motion accuracy of the hydrostatic guide rails of heavy-duty high-precision vertical hard turning machine tools, during the component assembly stage, high-precision gaskets 5 are used to adjust the upper pressure plate 8, the lower pressure plate bevel iron 7 and the 90° guide rail bevel iron 15 to ensure the oil film gap and the oil film stiffness between the crossbeam 1 guide rail and the upper pressure plate 7, the lower pressure plate bevel iron 9, the crossbeam slide 2 guide surface and the 90° guide rail bevel iron 15. The simulated load tooling is used to detect and debug the oil film thickness, pressure and driving force of the hydrostatic guide rails. The position of the drive shaft screw is adjusted in the simulated working state. The above process means effectively ensure the installation accuracy and motion accuracy of the hydrostatic guide rails.

Claims

1. A method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool, characterized in that: The following steps are involved: 1) Level the crossbeam (1) and arrange the crossbeam (1) with the guide rail facing upwards; 2) Jointly researching the upper guide rail surface (3), the lower guide rail surface (4) and the 90° guide rail surface (6) of the crossbeam slide (2) to meet the process requirements; 3) Arrange the guide rail of the crossbeam (1) downward, and pad the upper guide rail large surface (3), the lower guide rail large surface (4) and the 90° guide rail surface (6) of the crossbeam slide seat (2) with a gasket (5) having a thickness of 0.03 mm, so that the gasket (5) and the guide rail on the crossbeam (1) fit tightly; 4) The crossbeam (1) is installed in the crossbeam slide (2), and the surfaces of the 90° guide rail inclined iron (15) and the lower pressing plate inclined iron (7) placed in the crossbeam slide (2) and the lower pressing plate (9) are grinded to the process requirements, and the positions of the lower pressing plate inclined iron (7) and the 90° guide rail inclined iron (15) are marked, and the gaskets (5) are removed; 5) The guide rail surface and the joint surface of the upper pressing plate (8) are simultaneously grinded together with the guide rail of the crossbeam (1) and the joint surface of the crossbeam slide (2) to meet the technological requirements; 6) Separate the crossbeam (1) from the crossbeam slide (2) and secure the crossbeam (1) off the ground, press the pressing plate inclined iron (7) and the 90° guide rail inclined iron (15) to the marked positions to fix the lower pressing plate inclined iron (7) and the 90° guide rail inclined iron (15), and install the loading tooling (11) on one side of the crossbeam slide (2); 7) Use the top groove plate (10) to make the upper guide rail surface (3) and the lower guide rail surface (4) of the crossbeam slide (2) fit closely with one side of the guide rail of the crossbeam (1). At this time, four micrometer gauge seats are sucked on the upper, lower, left and right positions of the crossbeam slide (2), and the needles of the gauges touch the upper and lower large surfaces of the guide rail of the crossbeam (1) and are adjusted to zero. Release the top groove plate (10) and supply oil to the hydrostatic guide rail. At this time, the micrometer value is the oil film thickness and the pressure of each hydrostatic oil chamber is recorded; 8) Use the top groove plate (10) to make the guide surface of the upper pressure plate (8) of the beam slide (2) and the guide surface of the lower pressure plate oblique iron (7) fit closely with the other side of the guide of the beam (1). At this time, four micrometer gauge seats are sucked on the upper, lower, left and right positions of the beam slide (2), and the needles of the gauges touch the upper and lower positions of the guide surface of the beam (1) and adjust to zero. Release the top groove plate (10) and supply oil to the hydrostatic guide rail. At this time, the micrometer value is the oil film thickness and the pressure of each hydrostatic oil chamber is recorded; 9) Supply oil to the hydrostatic guide rail and adjust the position of the drive shaft lead screw to ensure the correct position of the drive shaft under working conditions; 10) Measure the guide rail driving force of the crossbeam slide (2) as required.

2. A method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool according to claim 1, characterized in that: Two spaced brackets (14) are provided on both sides of the loading tool (11), and a horizontal screw rod (12) is installed on the bracket (14). One end of the screw rod (12) is fixedly connected to a plate body on one side of the top plate groove (10); on both sides of the bracket (14), two nuts (13) are threadedly connected to the screw rod (12).

3. The method for ensuring the motion accuracy of a hydrostatic guide rail of a high-precision hard turning machine tool according to claim 1, characterized in that: The opening of the upper top groove plate (10) faces downward, and the opening of the lower top groove plate (10) faces upward. The guide rails on the upper and lower sides of the crossbeam (1) are cooperatively installed in the openings of the upper and lower top groove plates (10).

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