A hydrostatic bearing spindle box for a high speed inertia friction welding machine

Abstract

The application discloses a static pressure bearing spindle box for a high-speed inertia friction welding machine, which is provided with a main motor at the rear side of the static pressure spindle box body, and a static pressure unloading oil cylinder is arranged in the static pressure spindle box body; a spindle sleeve is arranged at the front end of the static pressure unloading oil cylinder; a front end cover is arranged at the front end of the spindle sleeve; the spindle sleeve, the static pressure unloading oil cylinder and the front end cover form a closed shell, and a spindle unit is arranged in the closed shell; a piston a is arranged at the rear side of the inside of the static pressure unloading oil cylinder; a spindle I is arranged in the piston a; a thrust bearing is arranged between the front side of the inside of the piston a and the spindle I; a precise spindle front bearing and a precise spindle rear bearing are respectively arranged between the front end and the rear end of the spindle II and the spindle sleeve; a workpiece clamping unit is arranged at the front end of the spindle II; an inertia matching unit is arranged outside the front end cover; a front flange sleeve is arranged at the front side of the front end cover; and an auxiliary support seat is arranged on the front flange sleeve. The application can meet the high-speed and high-precision rotation of the spindle shaft system, and can also bear the maximum axial load during the top forging through the static pressure unloading oil cylinder, thereby effectively improving the use performance of the friction welding machine.

Description

Technical Field

[0001] This invention relates to a hydrostatic bearing spindle box for a high-speed inertial friction welding machine, belonging to the field of mechanical technology. Background Technology

[0002] The spindle of a friction welding machine differs from that of general equipment spindles or machine tool spindles. In addition to requiring high radial rotation accuracy, it must also withstand heavy axial loads from the upsetting cylinder and heavy radial loads generated by the high-speed rotation of the inertia disk. Existing friction welding machine spindle systems generally use bearing support, with cylindrical roller bearings or double-row tapered roller bearings used radially and multiple sets of thrust self-aligning roller bearings connected in series axially. The upsetting force is then unloaded by a balancing cylinder. This results in a complex shaft system that is difficult to assemble and adjust, and the bearings are subjected to high stresses and have a limited service life due to long-term heavy load impacts. Furthermore, the limitations of the bearing structure and specifications prevent it from meeting high-speed rotation requirements, thus significantly reducing the performance of the friction welding machine. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a hydrostatic bearing spindle box for a high-speed inertial friction welding machine. This device can meet the high-speed and high-precision rotation of the spindle system, and can also withstand the maximum axial load during upsetting through a hydrostatic unloading cylinder, effectively improving the performance of the friction welding machine.

[0004] The technical solution adopted by this invention to solve its technical problem is: a hydrostatic bearing spindle box for a high-speed inertia friction welding machine, comprising a hydrostatic spindle box body, a spindle sleeve, a spindle unit, an auxiliary support base, a hydrostatic unloading cylinder, a front end cover, a precision spindle front bearing, a precision spindle rear bearing, an inertia matching unit, a main motor, a workpiece clamping unit, and a rotary oil distributor. Two horizontal through holes A are provided in a set of diagonally opposite sections on the hydrostatic spindle box body. A main motor is located on the rear side of the hydrostatic spindle box body. A [unclear - possibly a component or device] is installed in the hydrostatic spindle box body. A horizontally arranged hydrostatic unloading cylinder has a horizontally oriented main shaft sleeve installed at its front end, and a front end cover installed at its front end. The main shaft sleeve, hydrostatic unloading cylinder, and front end cover form a closed housing. The main shaft unit is horizontally arranged and installed in this closed housing. The main shaft unit includes main shaft I and main shaft II. Main shaft II is located in front of main shaft I. Main shaft I and main shaft II are fixedly connected as a whole by high-strength bolts and end face keys. The end of main shaft I is connected to the drive end of the main motor through a non-contact overrunning clutch.

[0005] A piston a is installed on the rear side inside the hydrostatic unloading cylinder. The main shaft I is installed in the piston a. A thrust bearing is installed between the front side of the piston a and the main shaft I. A precision main shaft front bearing and a precision main shaft rear bearing are respectively installed between the front and rear ends of the main shaft II and the main shaft sleeve.

[0006] A workpiece clamping unit is installed at the front end of spindle II. The workpiece clamping unit includes a piston b and a tapered expansion sleeve. The piston b is installed inside the front end of spindle II, and the front end of the piston b is fixedly connected to the tapered expansion sleeve. An inertia matching unit is provided on the outer circumferential direction of the front end cover. On the front side of the front end cover, a front flange is installed on the outer circumferential direction of the tapered expansion sleeve. An auxiliary support seat with a triangular support structure is provided on the front flange. Two large-diameter high-speed precision bearings are installed at intervals between the inside of the auxiliary support seat and the outside of the front flange.

[0007] A rotary oil distributor is provided at the rear end of spindle I. The core of the spindle unit is provided with two high-pressure oil passages. The ends of the two high-pressure oil passages are connected to the rotary oil distributor. The front ends of the two high-pressure oil passages are connected to the two side cavities of piston b in spindle II.

[0008] Furthermore, the front bearing of the precision spindle is a high-precision, high-load-bearing double-row cylindrical roller bearing, and the rear bearing of the precision spindle is a high-precision thrust angular contact bearing for precision spindles.

[0009] Furthermore, the inertia matching unit includes several inertia disks, which are stacked and fixedly connected in sequence. The connected inertia disks are fixedly connected to the front end face of the hydrostatic spindle housing or to the front flange sleeve.

[0010] Furthermore, a horizontally arranged compression spring is provided between the lower side of piston a and the front side inside the hydrostatic unloading cylinder.

[0011] Furthermore, the piston a has several horizontal through holes B evenly spaced along its circumference, thus dividing the interior of the hydrostatic unloading cylinder into two interconnected hydrostatic chambers, namely the front chamber and the rear chamber.

[0012] Furthermore, the cylinder body of the hydrostatic unloading cylinder adopts a flange-type hollow structure, and piston a also adopts a hollow structure.

[0013] Furthermore, a high-flow-rate forced circulation oil lubrication system is installed on the cylinder body of the hydrostatic unloading cylinder above the front and rear bearings of the precision spindle.

[0014] Furthermore, the spindle system employs a combination of labyrinth seals, gap seals, and centrifugal seals.

[0015] Furthermore, the front end face of piston a does not contact the rear end face of main shaft I, and there is a gap; a gasket is provided on the rear side of the thrust bearing.

[0016] The beneficial effects of this invention are as follows: The axial upsetting pressure of friction welding is entirely borne by a hydrostatic unloading cylinder, resulting in minimal axial force on the spindle bearing and a relatively simple mechanical structure. The hydrostatic cylinder employs constant pressure annular throttling hydrostatic technology, ensuring a constant hydrostatic clearance mechanically, preventing pressure variations from affecting oil film thickness and causing hydrostatic surface damage. The radial bearings utilize high-speed thrust angular contact ball bearings and radially adjustable double-row cylindrical roller spindle bearings, maintaining high-precision rotation while meeting high-speed operation requirements. The auxiliary support can also be used in conjunction with the spindle for load bearing, further stabilizing the inertia disk. This hydrostatic spindle box is specifically designed for high-speed, high-precision, and large-tonnage inertial friction welding machine tools, serving as the most important main drive power input component of the entire machine. It can perform power input, workpiece clamping, inertia matching, and axial hydrostatic unloading of the welding upsetting main pressure. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a circuit diagram of the present invention.

[0019] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0020] Figure 3 This is a cross-sectional schematic diagram of the rear side of the present invention.

[0021] Figure 4 This is a schematic cross-sectional view of the front side of the present invention.

[0022] Figure 5 This is the right view of the present invention.

[0023] Figure 6 This is a schematic diagram showing the positions of the front chamber and the rear chamber in the hydrostatic unloading cylinder of the present invention.

[0024] Figure 7 This is a schematic diagram of the inertia matching unit of the present invention.

[0025] Figure 8 This is a schematic diagram of the invention in operation.

[0026] Figure 9 This is a schematic diagram of the labyrinth seal, gap seal, and centrifugal seal of the present invention.

[0027] Figure 10 This is a schematic diagram of the inertia matching unit of the present invention fixed on the front flange sleeve.

[0028] Figure 11 This is a cross-sectional schematic diagram of the present invention in operation.

[0029] Numbering on the map: 1. Hydrostatic spindle housing; 101. Through hole A; 2. Spindle sleeve; 3. Spindle unit; 301. Spindle I; 302. Spindle II; 4. Auxiliary support seat; 5. Hydrostatic unloading cylinder; 501. Piston a; 502. Through hole B; 503. Front chamber; 504. Rear chamber; 6. Main motor; 7. Rotary oil distributor; 8. Front end cover; 9. Precision spindle front bearing; 10. Precision spindle rear bearing; 11. Inertia matching unit; 1101. Inertia disk; 12. Workpiece clamping unit; 1201. Piston b 1202, tapered expansion sleeve; 13, front flange sleeve; 14, large-diameter high-speed precision bearing; 15, high-pressure oil passage; 16, compression spring; 17, high-flow forced circulation oil lubrication system; 18, labyrinth seal; 19, gap seal; 20, centrifugal seal; 21, thrust bearing; 22, gasket; 23, gap; 24, workpiece I; 25, upsetting main cylinder; 26, workpiece II; 27, tie rod; 28, tailstock; 29, bed. Detailed Implementation

[0030] like Figure 1 As shown in Figure 11, a hydrostatic bearing spindle box for a high-speed inertial friction welding machine includes a hydrostatic spindle box body 1, a spindle sleeve 2, a spindle unit 3, an auxiliary support seat 4, a hydrostatic unloading cylinder 5, a front cover 8, a precision spindle front bearing 9, a precision spindle rear bearing 10, an inertia matching unit 11, a main motor 6, a workpiece clamping unit 12, and a rotary oil distributor 7. Two horizontal through holes A101 are provided in a set of diagonally opposite sections on the hydrostatic spindle box body 1. A main motor 6 is located on the rear side of the hydrostatic spindle box body 1. A horizontally arranged hydrostatic unloading cylinder 5 is installed in the hydrostatic spindle box body 1. A horizontally arranged spindle sleeve 2 is installed at the front end of the hydrostatic unloading cylinder 5. A front cover 8 is installed at the front end of the spindle sleeve 2. The spindle sleeve 2, the hydrostatic unloading cylinder 5, and the front cover 8 form a closed housing. The spindle unit 3 is horizontally arranged and installed in this closed housing.

[0031] The spindle unit 3 includes spindle I 301 and spindle II 302. Spindle II 302 is located in front of spindle I 301. Spindle I 301 and spindle II 302 are fixedly connected as a whole by high-strength bolts and end face keys. The end of spindle I 301 is connected to the drive end of the main motor 6 through a non-contact overrunning clutch.

[0032] A piston a501 is installed on the rear side inside the hydrostatic unloading cylinder 5, and the main shaft I 301 is installed in the piston a501. The cylinder body of the hydrostatic unloading cylinder 5 adopts a flange-type hollow structure, and the piston a501 also adopts a hollow structure. A thrust bearing 21 is installed between the front side of the piston a501 and the main shaft I 301. A precision main shaft front bearing 9 and a precision main shaft rear bearing 10 are respectively installed between the front and rear ends of the main shaft II 302 and the main shaft sleeve 2. The precision main shaft front bearing 9 is a high-precision, high-load double-row cylindrical roller bearing, and the precision main shaft rear bearing 10 is a high-precision thrust angular contact bearing for precision main shafts.

[0033] A workpiece holding unit 12 is installed at the front end of the spindle II 302. The workpiece holding unit 12 includes a piston b1201 and a tapered expansion sleeve 1202. The piston b1201 is installed inside the front end of the spindle II 302, and the front end of the piston b1201 is fixedly connected to the tapered expansion sleeve 1202. An inertia matching unit 11 is provided on the outer circumferential direction of the front end cover 8. A front flange sleeve 13 is installed on the outer circumferential direction of the tapered expansion sleeve 1202 on the front side of the front end cover 8. The inertia matching unit 11 includes several inertia disks 1101. The inertia disks 1101 are stacked and fixedly connected in sequence. The connected inertia disks 1101 are fixedly connected to the front end face of the hydrostatic spindle housing 1, or fixedly connected to the front flange sleeve 13. An auxiliary support seat 4 with a triangular support structure is provided on the front flange sleeve 13. Two large-diameter high-speed precision bearings 14 are installed between the inside of the auxiliary support seat 4 and the outside of the front flange sleeve 13.

[0034] A rotary oil distributor 7 is provided at the rear end of spindle I 301. Two high-pressure oil passages 15 are provided in the core of spindle unit 3. The ends of the two high-pressure oil passages 15 are connected to the rotary oil distributor 7. The front ends of the two high-pressure oil passages 15 are connected to the two side cavities of piston b1201 in spindle II 302.

[0035] A horizontally arranged compression spring 16 is provided between the lower side of piston a501 and the front side of the interior of hydrostatic unloading cylinder 5; several horizontally arranged through holes B502 are evenly spaced on the circumference of piston a501, thus dividing the interior of hydrostatic unloading cylinder 5 into two interconnected hydrostatic chambers, namely front chamber 503 and rear chamber 504; above the precision spindle front bearing 9 and the precision spindle rear bearing 10, a high-flow-rate forced circulation oil lubrication system 17 is installed on the cylinder body of hydrostatic unloading cylinder 5.

[0036] The spindle system adopts a combination of labyrinth seal 18, gap seal 19 and centrifugal seal 20; the front end face of piston a501 does not contact the rear end face of spindle I301, and there is a gap 23; a gasket 22 is provided on the rear side of thrust bearing 21.

[0037] During use, workpiece I24 is installed in the conical expansion sleeve 1202. Hydraulic oil drives piston b1201 to move through high-pressure oil passage 15. Piston b1201 drives conical expansion sleeve 1202 to fix and clamp workpiece I24. Workpiece II26 is fixed in the locking seat on the side of the upsetting main cylinder 25. Before welding, the drive end of the main motor 6 drives the spindle unit 3 to rotate at high speed under the support of thrust bearing 21, precision spindle front bearing 9 and precision spindle rear bearing 10. Energy is accumulated through the inertia disk 1101 at the front end of spindle II302. When the speed of spindle unit 3 reaches the predetermined value, the main motor 6 will disengage from the end of spindle I301 through non-contact overrunning clutch. The spindle unit 3 clamps workpiece I24 and continues to rotate at high speed by inertial torque. Then, the upsetting main cylinder 25 pushes the workpiece II26 fixedly clamped in the locking seat to press against workpiece I24. Friction welding is achieved through the principle of friction heat melting.

[0038] This hydrostatic bearing spindle box adopts a closed through-hole spindle box structure that is narrow at the top and wide at the bottom. The hydrostatic spindle box 1 has a double-walled structure with horizontal ribs, which gives it good rigidity and stability. The hydrostatic spindle box 1 has two through holes A101 diagonally, which are used to insert the tie rod 27 to connect the hydrostatic spindle box 1 to the tailstock 28. The bottom of the hydrostatic spindle box 1 has a side guide keyway, and the hydrostatic spindle box 1 is fixedly connected to the bed 29 by screws and guide keys. The main motor 6 is installed on the rear side of the hydrostatic spindle box 1. The drive end of the main motor 6 is connected to the spindle I 301 through a non-contact overrunning clutch as the input source of the main force.

[0039] The spindle sleeve 2, the hydrostatic unloading cylinder 5, and the front cover 8 form a closed housing, which houses the shaft system of the spindle unit 3. The axial upsetting thrust generated during friction welding acts directly on the spindle unit 3. The hydrostatic unloading cylinder 5 at the rear end of the spindle unit 3 is connected to the upsetting cylinder 25 through a pipeline and supplies oil simultaneously to balance the maximum axial load required for upsetting during friction welding. The radial direction of the spindle II 302 is supported by two sets of rolling bearings. The precision front spindle bearing 9 of the front support is supported by a high-precision, high-load double-row cylindrical roller bearing to ensure the high-precision rotation of the spindle unit 3 and to bear the radial load generated when the front inertia disk 1101 rotates at high speed. The precision rear spindle bearing 10 of the rear support is supported by a high-precision thrust angular contact bearing for precision spindles, which can withstand the bidirectional axial working load generated before the upsetting thrust of the spindle is established while ensuring the radial rotation accuracy.

[0040] The spindle unit 3 is supported and fixed in the closed spindle sleeve 2 by precision rolling bearings. The front end is used to connect the inertia matching unit 11 and the workpiece clamping unit 12, and the rear end is used to connect the rotary oil distributor 7 and the power drive system. The spindle unit 3 can be driven by the main motor 6 to achieve high-speed rotation. The spindle unit 3 adopts a split assembly structure. The spindle I 301 and spindle II 302 are connected into a whole by high-strength bolts and end face keys. The core of the spindle unit 3 is provided with two high-pressure oil passages 15 for clamping and loosening of workpiece I 24.

[0041] The rear end of the main spindle I301 is equipped with a rotary oil distributor 7, which adopts a working mode of radial floating supported by bearings at both ends. The inner ring surface of the rotary oil distributor 7 and the shaft diameter of the main spindle I301 are sealed with oil by an annular gap throttling method. By matching calculations of sealing diameter, sealing gap, sealing length and sealing mating surface accuracy, it can be ensured that the clamping and loosening pressure of workpiece I24 is stable, while the unloading flow and pressure loss are minimized. The clamping method of workpiece I24 is that the axial movement of piston b1201 drives the conical expansion sleeve 1202 to achieve radial clamping. The conical expansion sleeve 1202 is fixed to piston b1201 by screws.

[0042] To ensure the support rigidity and stability of the spindle unit 3 shaft system during high-speed rotation, a radial auxiliary support seat 4 is also provided at the front end of the hydrostatic spindle housing 1. It is connected to the spindle unit 3 by two sets of large-diameter high-speed precision bearings 14 and a front flange sleeve 13. It can work together with the precision spindle front bearing 9 of the spindle unit 3 to resist the huge inertial torque generated by the inertia disk 1101 during high-speed rotation. The auxiliary support seat 4 adopts a highly stable triangular support seat structure. The bottom is fixed to the bed 29 by screws and pins, and the height is adjusted by adjustable shims to adjust the center height.

[0043] The hydrostatic unloading cylinder 5 is installed at the tail of the main shaft sleeve 2. It is a single-acting cylinder with constant pressure hydrostatic unloading operation mode. The cylinder body of the hydrostatic unloading cylinder 5 adopts a flange-type hollow structure. The piston a501 also adopts a hollow structure and is supported on the main shaft I301 by radial bearings and thrust bearings 21. The piston a501 can move axially but cannot rotate.

[0044] The front end face of piston a501 does not contact the rear end face of main shaft I301, and there is a gap 23. The axial dimension is adjusted and controlled by the shim 22 of thrust bearing 21 to form a sealing oil ring with a uniform and fixed gap value, which is used as the end face sealing oil of hydrostatic unloading cylinder 5. The sealing edge area is calculated and must meet the maximum axial upsetting thrust generated during friction welding. The radial direction of hydrostatic unloading cylinder 5 is achieved by using an annular gap between the hollow flange and the main shaft diameter to achieve hydrostatic throttling sealing. Through the predetermined sealing gap and sealing ring width, the internal cavity pressure value of hydrostatic unloading cylinder 5 is kept constant to ensure the rigidity and stability of welding.

[0045] The piston a501 is provided with several through holes B502, and the hydrostatic unloading cylinder 5 is therefore divided into two interconnected hydrostatic chambers. The pressurized oil enters from the rear chamber 504 into the front chamber 503 and overflows from the end face and radially at two throttling sealing oil ring gaps. By calculation, the area of ​​the rear chamber 504 is larger than the area of ​​the front chamber 503. The pressurized oil will generate an axial pressure to the right, pressing the thrust bearing 21 to ensure that the end face hydrostatic throttling sealing oil gap is constant. The piston a501 is also provided with a compression spring 6 at its outer end. The compression spring 6 causes the piston a501 to generate a forward thrust, so that the thrust bearing 21 is always under stress and prevents the thrust bearing 21 from loosening.

[0046] The inertia matching unit 11 is installed on the outside of the front cover 8 and consists of multiple inertia disks 1101 that can be stacked on each other. It is used to match the inertial torque required for friction welding of different workpieces. The inertia disks 1101 can be connected in sequence and fixed on the front face of the hydrostatic spindle housing 1. Alternatively, they can be moved to the right end and fixed to the front flange sleeve 13 according to the inertia required by workpiece I24. Each inertia disk 1101 is connected by locking screws and positioning keys to ensure that the overall strength remains unchanged after any combination.

[0047] Because the spindle unit 3 generates a wind barrier effect when rotating at high speed, the external lubricating oil cannot enter the bearing. Therefore, the bearing lubrication on the spindle unit 3 adopts a high-flow forced circulation oil lubrication system 17 with a certain pressure. The lubricating oil is injected from the bearing through a high-pressure spray method to lubricate the precision spindle front bearing 9 and the precision spindle rear bearing 10. This not only improves the quality of lubrication, but also removes most of the frictional heat generated by high-speed rotation, effectively extending the service life of the bearing.

[0048] Due to limitations in size, pressure, and speed, high-speed friction welding machines cannot use conventional sealing methods. The specifications and maximum linear speed of general contact rotary seals cannot meet the requirements. Therefore, this spindle system adopts a combination of labyrinth seal 18, gap seal 19, and centrifugal seal 20. The bottom of the spindle sleeve 2 is equipped with multiple oil return holes to ensure that the lubricating oil is quickly discharged and to prevent oil overflow.

Claims

1. A hydrostatic bearing spindle box for a high-speed inertial friction welding machine, characterized in that: The system includes a hydrostatic spindle housing (1), a spindle sleeve (2), a spindle unit (3), an auxiliary support base (4), a hydrostatic unloading cylinder (5), a front end cover (8), a precision spindle front bearing (9), a precision spindle rear bearing (10), an inertia matching unit (11), a main motor (6), a workpiece clamping unit (12), and a rotary distributor (7). Two horizontal through holes A (101) are provided in a set of diagonally opposite sections on the hydrostatic spindle housing (1). A main motor (6) is located on the rear side of the hydrostatic spindle housing (1). A horizontally arranged hydrostatic unloading cylinder (5) is installed in the hydrostatic spindle housing (1). The front end of the hydrostatic unloading cylinder (5)... A horizontal spindle sleeve (2) is installed, and a front cover (8) is installed at the front end of the spindle sleeve (2). The spindle sleeve (2), the hydrostatic unloading cylinder (5), and the front cover (8) form a closed housing. The spindle unit (3) is horizontally arranged and installed in the closed housing. The spindle unit (3) includes spindle I (301) and spindle II (302). Spindle II (302) is located in front of spindle I (301). Spindle I (301) and spindle II (302) are fixedly connected as a whole by high-strength bolts and end face keys. The end of spindle I (301) is connected to the drive end of the main motor (6) through a non-contact overrunning clutch. A piston a (501) is provided on the rear side inside the hydrostatic unloading cylinder (5). The main shaft I (301) is installed in the piston a (501). A thrust bearing (21) is installed between the front side inside the piston a (501) and the main shaft I (301). A precision main shaft front bearing (9) and a precision main shaft rear bearing (10) are respectively installed between the front and rear ends of the main shaft II (302) and the main shaft sleeve (2). A workpiece holding unit (12) is installed at the front end of the spindle II (302). The workpiece holding unit (12) includes a piston b (1201) and a tapered expansion sleeve (1202). The piston b (1201) is installed inside the front end of the spindle II (302). The front end of the piston b (1201) is fixedly connected to the tapered expansion sleeve (1202). An inertia matching unit (11) is provided on the outer circumferential direction of the front end cover (8). A front flange sleeve (13) is installed on the front side of the front end cover (8) on the outer circumferential direction of the tapered expansion sleeve (1202). An auxiliary support seat (4) with a triangular support structure is provided on the front flange sleeve (13). Two large-diameter high-speed precision bearings (14) are installed between the inside of the auxiliary support seat (4) and the outside of the front flange sleeve (13) at intervals. A rotary oil distributor (7) is provided at the rear end of spindle I (301). Two high-pressure oil passages (15) are provided in the core of spindle unit (3). The ends of the two high-pressure oil passages (15) are connected to the rotary oil distributor (7). The front ends of the two high-pressure oil passages (15) are connected to the two side cavities of piston b (1201) in spindle II (302).

2. The hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: The front bearing (9) of the precision spindle is a high-precision, high-load double-row cylindrical roller bearing, and the rear bearing (10) of the precision spindle is a high-precision thrust angular contact bearing for the precision spindle.

3. The hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: The inertia matching unit (11) includes several inertia disks (1101). The inertia disks (1101) are stacked and arranged in sequence and fixedly connected. The connected inertia disks (1101) are fixedly connected to the front end face of the hydrostatic spindle housing (1) or fixedly connected to the front flange sleeve (13).

4. The hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: A horizontally arranged compression spring (16) is provided between the lower side of piston a (501) and the front side inside the hydrostatic unloading cylinder (5).

5. A hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: Piston a (501) has several horizontal through holes B (502) evenly spaced along its circumference. As a result, the interior of the hydrostatic unloading cylinder (5) is divided into two interconnected hydrostatic chambers, namely the front chamber (503) and the rear chamber (504).

6. The hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: The cylinder body of the hydrostatic unloading cylinder (5) adopts a flange-type hollow structure, and the piston a (501) also adopts a hollow structure.

7. A hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: Above the front bearing (9) and rear bearing (10) of the precision spindle, a high-flow-rate forced circulation oil lubrication system (17) is installed on the cylinder body of the hydrostatic unloading cylinder (5).

8. A hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: The spindle system employs a combination of labyrinth seal (18), gap seal (19), and centrifugal seal (20).

9. A hydrostatic bearing spindle box for a high-speed inertial friction welding machine according to claim 1, characterized in that: The front end face of piston a (501) does not contact the rear end face of main shaft I (301), and there is a gap (23); a gasket (22) is provided on the rear side of the thrust bearing (21).

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