A turning tool for eccentric three-jaw of a primary stator of a rotary vane pump and a machining method

Abstract

The application discloses a turning tool and machining method for eccentric three-jaw of a primary stator of a rotary vane pump, which comprises a hydraulic chuck and an eccentric three-jaw, a sliding seat is arranged on the hydraulic chuck, the eccentric three-jaw is connected with the hydraulic chuck through the sliding seat, an eccentric hole is arranged on the inner side of the eccentric three-jaw, a reference outer circle is arranged on the outer side of the eccentric three-jaw, the axis of the hydraulic chuck is eccentrically arranged with the axis of the eccentric hole of the eccentric three-jaw, the axis of the hydraulic chuck is coaxially arranged with the axis of the reference outer circle of the eccentric three-jaw, and the hydraulic chuck is installed on a main shaft of a machine tool. The eccentric three-jaw turning tool and machining method solve the technical problems of the existing technology, such as difficulty in putting in, poor precision of a numerical control milling machine and a self-centering three-jaw chuck, and high-precision over-tolerance of an eccentric distance.

Description

Technical Field

[0001] This invention relates to the field of auxiliary processing technology for eccentric products, specifically to a three-jaw turning fixture and processing method for eccentric rotary vane pump first-stage stator. Background Technology

[0002] The first-stage stator is the core component of a rotary vane pump. It is a high-precision part, with all dimensional and geometric tolerances reaching μ-level accuracy. It plays a crucial role in the technical specifications of the rotary vane pump.

[0003] like Figures 1-2 As shown, it is a rotating part with an outer circle and a circular boss on the outer circle; an inner hole, the center line of which coincides with the center line of the outer circle, which is a coaxial circle; an eccentric hole, the axis of which is offset from the axis of the inner hole by a certain distance, and the distance tolerance requirement is ±0.005; the bottom surface of the eccentric hole is required to be 0.01 different from the bottom surface of the inner hole.

[0004] Existing technologies for machining eccentric holes in primary stators include:

[0005] 1. The machining is carried out using a flat-bed CNC lathe and a eccentric tooling fixture. The axis of the eccentric positioning hole of the eccentric tooling fixture is parallel to and offset by a certain distance from the center axis of the three jaws of the lathe. The outer circle of the first-stage stator is placed into the eccentric hole of the eccentric tooling fixture, and the side top outer circle or end pressure outer circle upper end face is pressed.

[0006] Disadvantages: It is difficult to put in and take out the first-stage stator, and clamping is time-consuming and labor-intensive; there is a gap between the outer circle of the first-stage stator and the eccentric hole of the ferrule, and the eccentricity tolerance of the first-stage stator ±0.005 cannot be guaranteed.

[0007] 2. A CNC milling machine and a standard self-centering three-jaw chuck are used for clamping, with machining performed at a certain program offset. The three-jaw chuck is fixed to the CNC milling machine's worktable. During milling and boring, the jaws of the three-jaw chuck clamp the reference hole on the outer diameter of the primary stator. The outer diameter of the primary stator is placed into the reference hole of the three-jaw chuck, and the three jaws self-center and clamp the primary stator. The primary stator can be easily and quickly inserted and removed from the three jaws.

[0008] Disadvantages: First, the repeatability of the XYZ axes of the CNC milling machine is 0.01-0.02. Second, the extension and retraction accuracy of the ordinary self-centering three-jaw chuck is 0.01-0.03, which affects the origin coordinates of the first-stage stator on the CNC machine tool. Due to the influence of both factors, the accuracy of machining the eccentric hole of the first-stage stator exceeds the tolerance by ±0.005. Summary of the Invention

[0009] The purpose of this invention is to provide a tooling and machining method for eccentric three-jaw turning of the first stage stator of a rotary vane pump, so as to solve the technical problems of difficult placement, poor accuracy between CNC milling machines and self-centering three-jaw chucks, and high-precision deviation of eccentricity tolerance in the prior art.

[0010] To achieve the above object, the application provides a turning tool for eccentric three-jaw of primary stator of rotary vane pump, which comprises a hydraulic chuck and an eccentric three-jaw.

[0011] Further, three slide grooves are uniformly arranged on the upper surface of the hydraulic chuck, the slide seat is installed in the slide groove, and the slide seat linearly slides in the slide groove; the three slide seats installed on the hydraulic chuck are connected with the hydraulic cylinder piston rod, and the hydraulic cylinder piston rod controls the synchronous sliding of the three slide seats in the slide groove.

[0012] Further, the eccentric three-jaw is composed of three clamping jaws, the inner side of the three clamping jaws of the eccentric three-jaw is processed with a stepped groove, the stepped groove is sequentially provided with an avoiding hole and an eccentric hole from bottom to top according to different inner diameters, the stepped surface of the stepped groove is a supporting bottom plane, and the outer side of the three clamping jaws of the eccentric three-jaw is processed with a reference outer circle.

[0013] Further, the root part connecting the supporting bottom plane and the eccentric hole is provided with a dovetail ring groove, the dovetail ring groove is arranged at an angle of 60°; and the outer end part connecting the supporting bottom plane and the avoiding hole is provided with a gas elimination hole with a depth of 0.5 mm.

[0014] A machining method of a turning tool for eccentric three-jaw of primary stator of rotary vane pump, which comprises the steps of turning a reference and machining an eccentric hole of three-jaw:

[0015] The turning reference comprises the following sub-steps:

[0016] S11, the three clamping jaws of the eccentric three-jaw are respectively installed on the slide seats of the hydraulic chuck, and the eccentric three-jaw and the slide seat are fastened through M12 inner hexagonal screws, and the hydraulic chuck is coaxially installed on the main shaft of the machine tool;

[0017] S12, the hydraulic cylinder piston rod connected with the slide seat of the hydraulic chuck is used to open the eccentric three-jaw, the distance from the inner wall of the eccentric three-jaw to the axis of the hydraulic chuck is the same, the first inner support is put into the hydraulic chuck, and the upward extending end of the first inner support extends into the lower end of the eccentric three-jaw;

[0018] S13, the hydraulic cylinder piston rod connected with the slide seat of the hydraulic chuck is used to contract the eccentric three-jaw, so that the inner wall of the bottom end of the eccentric three-jaw clamps the first inner support;

[0019] S14, the avoiding hole is turned on the inner side of the eccentric three-jaw through the lathe, and the reference outer circle is turned on the outer side of the eccentric three-jaw through the lathe;

[0020] S15, the hydraulic cylinder piston rod connected by the slide of the hydraulic chuck opens the eccentric three-jaw, and the first inner support is removed;

[0021] The eccentric hole of the machining three-jaw includes the following sub-steps:

[0022] S21, the hydraulic chuck and the eccentric three-jaw are removed from the machine tool spindle and installed on the reference seat;

[0023] S22, the second inner support is placed into the avoidance hole, and the eccentric three-jaw is contracted by the hydraulic cylinder piston rod connected by the slide of the hydraulic chuck to clamp the second inner support;

[0024] S23, the reference outer circle runout is found by the μ table to be 0.002, so that the axis of the reference outer circle coincides with the axis of the machining center spindle;

[0025] S24, the distance of the axis of the hydraulic chuck is offset by the control program, the eccentric hole is milled and bored in the inner wall of the avoidance hole by the numerical control milling machine, the vent hole is milled outside the support bottom plane formed by the eccentric hole and the avoidance hole, and the dovetail ring groove is milled at the root of the support bottom plane; the eccentric distance tolerance between the axis of the eccentric hole of the eccentric three-jaw and the axis of the hydraulic chuck is 0.002;

[0026] S25, after the eccentric hole of the eccentric three-jaw is machined, the hydraulic chuck is connected with the eccentric three-jaw and removed from the reference seat, and then the hydraulic chuck is connected with the eccentric three-jaw and installed back on the machine tool spindle, and the precision of the hydraulic chuck and the machine tool spindle is restored to 0.002.

[0027] Further, the cylindricality of the reference outer circle in S14 is 0.002, and the axes of the reference outer circle and the avoidance hole coincide with the axes of the hydraulic chuck and the machine tool spindle.

[0028] Further, S21 further includes the following sub-steps:

[0029] S211, the reference seat is placed on the workbench of the machining center, and the reference seat is fastened with the workbench by M16 bolts and M16 nuts;

[0030] S212, the upper plane of the reference seat is machined so that the flatness of the upper plane of the reference seat is 0.002, the parallelism between the upper plane of the reference seat and the workbench of the machining center is 0.002, and the lower plane of the hydraulic chuck is in full contact with the upper plane of the reference seat;

[0031] S213, the center line of one of the clamping jaws of the eccentric three-jaw is parallel to the Y-axis of the machining center, and is fastened with the reference seat by M16 hexagonal screws.

[0032] Further, the outer diameter of the second inner support is same as the inner diameter of the avoiding hole, the cooperation gap between the second inner support and the avoiding hole is 0.01, and the cylindricity of the outer wall of the second inner support and the inner wall of the avoiding hole is 0.002, so that the second inner support can be in full contact with the avoiding hole; the inner support hole is arranged at the middle position of the second inner support, and the second inner support is connected with the reference seat through cooperation of the M12 inner hexagonal screw and the inner support hole.

[0033] Based on the above technical solution, the application can produce the following beneficial effects:

[0034] The application provides a turning tool and a machining method for a first-stage stator eccentric three-jaw of a rotary vane pump.

[0035] 1. The inclined bed numerical control lathe and the hydraulic three-jaw chuck are adopted, and the precision of the lathe and the chuck itself is solved.

[0036] 2. The problem that one hand is used to rotate the chuck lock and the other hand is used to hold the first-stage stator is solved, the operation is convenient, and the manual labor is reduced.

[0037] 3. The three-jaw is opened and closed with a certain stroke, the space for placing the first-stage stator in the three-jaw eccentric hole is large, the first-stage stator is quickly placed and taken out, the production efficiency is improved, the production cost is saved, and mass production is suitable.

[0038] 4. The eccentric distance tolerance ±0.005 of the eccentric hole of the first-stage stator is ensured, and the precision that the bottom surface of the eccentric hole is different from the bottom surface of the inner hole by 0.01 is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a product structure front view of the first-stage stator in the prior art;

[0040] Figure 2 is a product structure top view of the first-stage stator in the prior art;

[0041] Figure 3 is a structure schematic view of the embodiment of the application;

[0042] Figure 4 is a structure top view of the embodiment of the application;

[0043] Figure 5 is an operation schematic view of the base reference step of the embodiment of the application;

[0044] Figure 6 is an operation schematic view of the three-jaw eccentric hole machining of the embodiment of the application;

[0045] Figure 7 is an operation schematic view of the first-stage stator machining of the embodiment of the application;

[0046] Figure: 1, hydraulic chuck; 2, eccentric three-jaw; 3, eccentric hole; 4. reference circle; 5. slide; 6, machine tool spindle; 7, clearance hole; 8, support bottom plane; 9, dovetail ring groove; 10, gas hole; 11, first inner support; 12, reference seat; 13, second inner support. DETAILED DESCRIPTION

[0047] In order to better understand the purpose, structure and function of the present application, the following will be further described in detail in combination with the drawings.

[0048] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] As Figures 3-4 shown, the present application provides a turning tool for eccentric three-jaw of primary stator of rotary vane pump, characterized in that it comprises a hydraulic chuck 1 and an eccentric three-jaw 2, the hydraulic chuck 1 is provided with a slide 5, the eccentric three-jaw 2 is connected with the hydraulic chuck 1 through the slide 5, the inner side of the eccentric three-jaw 2 is provided with an eccentric hole 3, the outer side of the eccentric three-jaw 2 is provided with a reference circle 4, the axis of the hydraulic chuck 1 is eccentrically arranged with the axis of the eccentric hole 3 of the eccentric three-jaw 2, the axis of the hydraulic chuck 1 is coaxially arranged with the axis of the reference circle 4 of the eccentric three-jaw 2, and the hydraulic chuck 1 is installed on a machine tool spindle 6.

[0050] Three sliding grooves are evenly arranged on the upper surface of the hydraulic chuck 1, the slide 5 is installed in the sliding groove, and the slide 5 linearly slides in the sliding groove; the three slides 5 installed on the hydraulic chuck 1 are connected with the hydraulic cylinder piston rod, and the hydraulic cylinder piston rod controls the synchronous sliding of the three slides 5 in the sliding groove.

[0051] The eccentric three-jaw 2 is composed of three clamping jaws, the inner side of the three clamping jaws of the eccentric three-jaw 2 is processed with a stepped groove, the stepped groove is sequentially provided with a clearance hole 7 and an eccentric hole 3 from bottom to top according to the different inner diameters, the stepped surface of the stepped groove is a support bottom plane 8, and the outer side of the three clamping jaws of the eccentric three-jaw 2 is processed with a reference circle 4.

[0052] The root of the support bottom plane 8 connected with the eccentric hole 3 is provided with a dovetail ring groove 9, and the dovetail ring groove 9 is arranged at 60°; the outer end of the support bottom plane 8 connected with the avoiding hole 7 is provided with a gas elimination hole 10 with a depth of 0.5 mm.

[0053] A machining method of a turning tool for a primary stator eccentric three-jaw of a rotary vane pump, which comprises the following steps:

[0054] As shown in Figure 5 , the turning reference comprises the following sub-steps:

[0055] S11, three clamping jaws of the eccentric three-jaw 2 are respectively installed on the slide seat 5 of the hydraulic chuck 1, and the eccentric three-jaw 2 is fastened with the slide seat 5 through M12 inner hexagonal screws, and the hydraulic chuck 1 is coaxially installed on the machine tool spindle 6;

[0056] S12, the eccentric three-jaw 2 is opened through the hydraulic cylinder piston rod connected with the slide seat 5 of the hydraulic chuck 1, the distance from the inner wall of the eccentric three-jaw 2 to the axis of the hydraulic chuck 1 is the same, the first inner support 11 is put into the hydraulic chuck 1, and the upward extending end of the first inner support 11 extends into the lower end of the eccentric three-jaw;

[0057] S13, the eccentric three-jaw 2 is retracted through the hydraulic cylinder piston rod connected with the slide seat 5 of the hydraulic chuck 1, so that the inner wall of the bottom end of the eccentric three-jaw 2 clamps the first inner support 11;

[0058] S14, the avoiding hole 7 is turned on the inner side of the eccentric three-jaw 2 through the lathe, and the reference outer circle 4 is turned on the outer side of the eccentric three-jaw through the lathe;

[0059] S15, the eccentric three-jaw 2 is opened through the hydraulic cylinder piston rod connected with the slide seat 5 of the hydraulic chuck 1, and the first inner support 11 is removed;

[0060] As shown in Figure 6 , the machining of the three-jaw eccentric hole comprises the following sub-steps:

[0061] S21, the hydraulic chuck 1 and the eccentric three-jaw 2 are removed from the machine tool spindle 6 and installed on the reference seat 12;

[0062] S22, the second inner support 13 is put into the avoiding hole 7, and the eccentric three-jaw 2 is retracted through the hydraulic cylinder piston rod connected with the slide seat 5 of the hydraulic chuck 1 to clamp the second inner support;

[0063] S23, the reference outer circle 4 is found to be 0.002 through the μ table, so that the axis of the reference outer circle 4 coincides with the axis of the machining center spindle;

[0064] S24. By controlling the distance of the offset of the axis of the hydraulic chuck 1, the eccentric hole 3 is milled and bored on the inner wall of the clearance hole 7 by a CNC milling machine. The degassing hole 10 is milled on the outside of the support bottom plane 8 formed by the eccentric hole 3 and the clearance hole 7. Then, the dovetail groove 9 is milled at the root of the support bottom plane 8. The eccentricity tolerance between the axis of the eccentric hole 3 of the eccentric three-jaw 2 and the axis of the hydraulic chuck 1 is 0.002.

[0065] After the eccentric hole 3 of the eccentric three-jaw 2 is machined, the hydraulic chuck 1 and the eccentric three-jaw 2 are removed from the reference seat 12 together, and then the hydraulic chuck 1 and the eccentric three-jaw 2 are put back into the machine tool spindle 6 to restore the accuracy of the hydraulic chuck 1 and the machine tool spindle 6 to 0.002.

[0066] In S14, the cylindricity of the reference outer circle 4 is 0.002, and the axis of the reference outer circle 4 and the clearance hole 7 coincides with the axis of the hydraulic chuck 1 and the machine tool spindle 6.

[0067] S21 further includes the following sub-steps:

[0068] S211. Place the reference base 12 on the worktable of the machining center and fasten the reference base 12 to the worktable with M16 bolts and M16 nuts.

[0069] S212, the upper surface of the machining reference base 12 is made to achieve a flatness of 0.002, the parallelism between the upper surface of the reference base and the worktable of the machining center is 0.002, and the lower surface of the hydraulic chuck 1 is in full contact with the upper surface of the reference base 12.

[0070] S213, the center line of one of the jaws of the eccentric three-jaw 2 is parallel to the Y-axis of the machining center, and is fastened to the reference seat 12 by an M16 internal hex screw;

[0071] The outer diameter of the second inner support 13 is the same as the inner diameter of the clearance hole 7. The fitting clearance between the second inner support 13 and the clearance hole 7 is 0.01. The cylindricity of the outer wall of the second inner support 13 and the inner wall of the clearance hole 7 is 0.002, so that the second inner support 13 can fully contact the clearance hole 7. An inner support hole is provided in the middle position of the second inner support 13. The second inner support 13 is connected to the reference base 12 by engaging the inner support hole with an M12 hexagon socket screw.

[0072] like Figure 7 As shown, the operating principle of the eccentric three-jaw turning fixture for the first stage stator of a rotary vane pump according to the present invention is as follows:

[0073] 1. The piston rod of the hydraulic cylinder of the slant bed CNC lathe extends and transmits to the locking mechanism of the hydraulic chuck 1, causing the slide 5 to drive the eccentric three-jaw 2 to open.

[0074] 2. The primary stator is put into the eccentric hole 3 of the eccentric three-jaw 2, so that the outer circle and the lower end surface of the primary stator are in full contact with the inner wall and the bottom plane of the eccentric hole 3.

[0075] 3. The hydraulic cylinder piston rod is retracted, which is transmitted to the locking mechanism of the hydraulic chuck 1, so that the slide seat drives the eccentric three-jaw 2 to close and clamp the outer circle of the primary stator.

[0076] 4. After the primary stator is processed, the hydraulic cylinder piston rod is extended, which is transmitted to the locking mechanism of the hydraulic chuck 1, so that the slide seat 5 drives the eccentric three-jaw 2 to open and take out the primary stator.

[0077] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, modifications can be made to these features and embodiments to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A machining method for a rotary vane pump primary stator eccentric three-jaw turning tool, characterized in that, The eccentric three-jaw turning tool for the primary stator of a rotary vane pump comprises a hydraulic chuck (1) and an eccentric three-jaw (2), the hydraulic chuck (1) is provided with a sliding seat (5), the eccentric three-jaw (2) is connected with the hydraulic chuck (1) through the sliding seat (5), the inner side of the eccentric three-jaw (2) is provided with an eccentric hole (3), the outer side of the eccentric three-jaw (2) is provided with a reference outer circle (4), the axis of the hydraulic chuck (1) is eccentrically arranged with the axis of the eccentric hole (3) of the eccentric three-jaw (2), the axis of the hydraulic chuck (1) is coaxially arranged with the axis of the reference outer circle (4) of the eccentric three-jaw (2), and the hydraulic chuck (1) is installed on a machine tool spindle (6); three sliding grooves are uniformly arranged on the upper surface of the hydraulic chuck (1), the sliding seat (5) is installed in the sliding groove, and the sliding seat (5) linearly slides in the sliding groove; the three sliding seats (5) installed on the hydraulic chuck (1) are connected with hydraulic cylinder piston rods, and the hydraulic cylinder piston rods control the three sliding seats (5) to synchronously slide in the sliding grooves; the eccentric three-jaw (2) is composed of three clamping jaws, the inner side of the three clamping jaws of the eccentric three-jaw (2) is processed with a stepped groove, the stepped groove is sequentially provided with an avoiding hole (7) and the eccentric hole (3) from bottom to top according to different inner diameters, the stepped surface of the stepped groove is a supporting bottom plane (8), and the outer side of the three clamping jaws of the eccentric three-jaw (2) is processed with the reference outer circle (4); the root part of the supporting bottom plane (8) connected with the eccentric hole (3) is provided with a dovetail ring groove (9), and the dovetail ring groove (9) is arranged at 60°; the outer end part of the supporting bottom plane (8) connected with the avoiding hole (7) is provided with a gas elimination hole (10) with a depth of 0.5 mm; The machining method comprises the steps of turning a reference and machining an eccentric hole of a three-jaw: The turning of the reference comprises the following sub-steps: S11, the three clamping jaws of the eccentric three-jaw (2) are respectively installed on the sliding seats (5) of the hydraulic chuck (1), and the eccentric three-jaw (2) is fastened with the sliding seats (5) through M12 inner hexagonal screws, and the hydraulic chuck (1) is coaxially installed on the machine tool spindle (6); S12, the eccentric three-jaw (2) is opened through the hydraulic cylinder piston rods connected with the sliding seats (5) of the hydraulic chuck (1), the distance from the inner wall of the eccentric three-jaw (2) to the axis of the hydraulic chuck (1) is the same, the first inner support (11) is put into the hydraulic chuck (1), and the upward extending end of the first inner support (11) extends into the lower end of the eccentric three-jaw; S13, the eccentric three-jaw (2) is retracted through the hydraulic cylinder piston rods connected with the sliding seats (5) of the hydraulic chuck (1), so that the inner wall of the bottom end of the eccentric three-jaw (2) clamps the first inner support (11); S14, the avoiding hole (7) is turned on the inner side of the eccentric three-jaw (2) through the lathe, and the reference outer circle (4) is turned on the outer side of the eccentric three-jaw through the lathe; S15, the eccentric three-jaw (2) is opened through the hydraulic cylinder piston rods connected with the sliding seats (5) of the hydraulic chuck (1), and the first inner support (11) is removed; The machining of the eccentric hole of the three-jaw comprises the following sub-steps: S21, the hydraulic chuck (1) and the eccentric three-jaw (2) are taken off from the machine tool spindle (6) and installed on a reference seat (12); S22, the second inner support (13) is placed in the avoidance hole (7), the eccentric three-jaw (2) is retracted by the hydraulic cylinder piston rod connected by the sliding seat (5) of the hydraulic chuck (1) to clamp the second inner support; S23, the reference outer circle (4) is found by the μ table to jump 0.002, so that the axis of the reference outer circle (4) coincides with the axis of the main shaft of the machining center; S24, the distance of the axis of the hydraulic chuck (1) is offset by the control program, the eccentric hole (3) is milled and bored on the basis of the inner wall of the avoidance hole (7) by the numerical control milling machine, the gas hole (10) is milled outside the support bottom plane (8) formed by the eccentric hole (3) and the avoidance hole (7), and the dovetail ring groove (9) is milled at the root of the support bottom plane (8); the eccentric distance tolerance between the axis of the eccentric hole (3) of the eccentric three-jaw (2) and the axis of the hydraulic chuck (1) is 0.002; S25, after the eccentric hole (3) of the eccentric three-jaw (2) is processed, the hydraulic chuck (1) is connected with the eccentric three-jaw (2) to be removed from the reference seat (12), and then the hydraulic chuck (1) is connected with the eccentric three-jaw (2) to be installed back to the machine tool main shaft (6), and the accuracy of the hydraulic chuck (1) and the machine tool main shaft (6) is restored to 0.

002.

2. The machining method of claim 1, wherein, The cylindricality of the reference outer circle (4) in S14 is 0.002, and the axes of the reference outer circle (4) and the avoidance hole (7) coincide with the axes of the hydraulic chuck (1) and the machine tool main shaft (6).

3. The machining method of claim 1, wherein, The S21 further includes the following sub-steps: S211, the reference seat (12) is placed on the workbench of the machining center, and the reference seat (12) is fastened with the workbench by M16 bolts and M16 nuts; S212, the upper plane of the reference seat (12) is processed to make the flatness of the upper plane of the reference seat reach 0.002, the parallelism between the upper plane of the reference seat and the workbench of the machining center reaches 0.002, and the lower plane of the hydraulic chuck (1) is in full contact with the upper plane of the reference seat (12); S213, the center line of one of the clamping jaws of the eccentric three-jaw (2) is parallel to the Y-axis of the machining center, and the reference seat (12) is fastened by M16 internal hexagonal screws.

4. The machining method of claim 1, wherein, The outer diameter of the second inner support (13) is the same as the inner diameter of the avoidance hole (7), the fitting gap between the second inner support (13) and the avoidance hole (7) is 0.01, and the cylindricality of the outer wall of the second inner support (13) and the inner wall of the avoidance hole (7) is 0.002, so that the second inner support (13) can be in full contact with the avoidance hole (7); an inner support hole is formed in the middle position of the second inner support (13), and the second inner support (13) is connected with the reference seat (12) by cooperating with the inner support hole through M12 internal hexagonal screws.

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