Novel through water static pressure tank grinding device and process

Abstract

This invention relates to a novel through-type hydrostatic groove grinding device and process. The invention includes a positioning fixture; a grinding head holder; a grinding frame connected to the grinding head holder; a drive device including a motor base plate mounted on the vertical plane of the grinding head holder, a drive motor mounted on the motor base plate, a main shaft with its axis perpendicular to the motor base plate and connected to the drive end of the drive motor, a pulley mounted on the end of the main shaft, and a belt mounted on the pulley; a hydrostatic bearing assembly including a hydrostatic bearing housing mounted on the grinding head holder, a hydrostatic bearing cover mating with the hydrostatic bearing housing, a pin inserted between the through holes of the hydrostatic bearing housing and the hydrostatic bearing cover for preventing rotation, and a radial bearing sleeved on the pin; a grinding wheel mounted on the outer diameter of the radial bearing, with the belt sleeved in the groove of the outer diameter of the grinding wheel; the main shaft is connected to the grinding wheel via the pulley and belt for driving the grinding wheel to rotate. This invention requires only one clamping operation to sequentially complete through-type rough grinding and fine grinding.

Description

Technical Field

[0001] This invention relates to the field of manufacturing and processing technology, and in particular to a novel through-type hydrostatic pressure grinding device and process. Background Technology

[0002] In household rotary air conditioner compressors, the heat conversion rate is crucial to the overall performance. Its core structure is a dynamic sealing system of "cylinder-rolling rotor-vane," which uses a crankshaft to drive the rotor to rotate, changing the volume of the compression chamber and achieving efficient refrigerant compression. The vanes reciprocate within their slots during operation, therefore, the dimensional accuracy, surface roughness, and geometric tolerances of the cylinder vane slots must be extremely high. Consequently, high-precision machining of the cylinder vane slots becomes a key process in rotary compressor manufacturing.

[0003] Cylinder liners are typically made of round cast iron or powder metallurgy alloy castings. The inner wall of the groove is precision machined to obtain extremely low surface roughness, thereby ensuring a tight fit between the sliding vane and the groove wall, improving compression efficiency and service life.

[0004] In existing technologies, the grinding of grooves typically employs a horizontal electric spindle with a grinding wheel attachment rod. Due to the risk of interference between the attachment rod and the grinding area, a step-by-step rotation method is required during machining: first, the upper part of one side of the groove is ground, then the cylinder is rotated 180° to grind the lower part of that side; subsequently, the lower part of the other side is ground, and then rotated 180° again to complete the upper part of the other side. Therefore, a part requires four grinding operations and two rotations. This process not only increases the number of steps but also requires two grinding operations on the same surface, easily creating tool-joint steps, thus reducing machining accuracy. Furthermore, the multiple clamping and rotation operations significantly reduce machining efficiency, making it difficult to meet the high precision and efficiency requirements of mass production. Summary of the Invention

[0005] To address this, the present invention provides a novel through-type hydrostatic groove grinding device and process. During the processing, the part only needs to be clamped once to complete the through-type rough grinding and fine grinding sequentially, and the two sides of the groove are ground simultaneously. This avoids the step error caused by multiple tool connections, effectively improves the dimensional accuracy and surface quality of groove grinding, and significantly improves the processing efficiency, meeting the high precision and high efficiency requirements of rotor compressor parts in mass production.

[0006] To solve the above-mentioned technical problems, the present invention provides a novel through-type hydrostatic groove grinding device, wherein the cylinder liner to be processed includes a first positioning hole, a second positioning hole, and a grinding groove extending radially from the first positioning hole to the second positioning hole, and the device includes: Positioning fixture, including a positioning seat for positioning and placing the cylinder liner to be processed; The grinding head holder is vertically arranged above the positioning fixture; The grinding frame is connected to the grinding head seat and is used to drive the grinding head seat to move up and down and to translate horizontally. The driving device includes a motor base plate mounted on the vertical plane of the grinding head seat, a drive motor mounted on the motor base plate, a main shaft with its axis perpendicular to the motor base plate and connected to the drive end of the drive motor, a pulley mounted on the end of the main shaft, and a belt mounted on the pulley. The hydrostatic bearing assembly includes a hydrostatic bearing housing mounted on the grinding head seat, a hydrostatic bearing cover that mates with the hydrostatic bearing housing, a pin inserted between the through holes of the hydrostatic bearing housing and the hydrostatic bearing cover for preventing rotation, and a radial bearing sleeved on the pin. A grinding wheel is mounted on the outer diameter of the radial bearing. A belt is fitted inside the groove on the outer diameter of the grinding wheel. The spindle is connected to the grinding wheel via the pulley and the belt to drive the grinding wheel to rotate. The first positioning hole allows the hydrostatic bearing assembly to extend into it, and the grinding groove allows the portion of the grinding wheel extending out of the hydrostatic bearing assembly to extend into it. The grinding wheel has a predetermined static pressure gap between its two side end faces and the hydrostatic bearing seat and the hydrostatic bearing cover, respectively, to form two static pressure cavities with the same shape and area; the filtered clean water can flow into the corresponding two static pressure cavities to form bidirectional static pressure.

[0007] In one embodiment of the present invention, the hydrostatic bearing housing and the hydrostatic bearing cover are respectively connected to an external clean water supply system through pipes, and the clean water enters the hydrostatic bearing housing after precision filtration.

[0008] In one embodiment of the present invention, the hydrostatic gap between the two side end faces of the grinding wheel and the hydrostatic bearing seat and the hydrostatic bearing cover is controlled to be 0.01mm-0.012mm.

[0009] In one embodiment of the present invention, the device further includes a worktable, a locking screw and a clamping block. The positioning fixture is installed on the worktable. The positioning seat is provided with a first through groove communicating with the grinding groove, the first positioning hole and the second positioning hole. The worktable is provided with a second through groove communicating with the first through groove. The clamping block is mounted on the positioning seat via the locking screw, and can be clamped onto the upper surface of the cylinder liner to be processed by the rotation of the locking screw. The clamping block is provided with a relief groove that matches the groove to be ground.

[0010] In one embodiment of the present invention, the grinding frame includes a reciprocating lifting assembly and a feeding assembly. The feeding assembly is connected to the grinding head seat and is used to adjust the position of the grinding wheel relative to the positioning fixture. The reciprocating lifting assembly is connected to the feeding assembly and is used to realize the lifting movement of the grinding wheel.

[0011] In one embodiment of the present invention, the grinding wheel is a CBN grinding wheel.

[0012] In one embodiment of the present invention, a belt tension adjustment cylinder and a motor base plate locking cylinder are also included. The motor base plate is vertically adjustable and mounted on the vertical plane of the grinding head seat. The motor base plate is provided with a vertical sliding groove. The vertical plane of the grinding head seat is connected to a locking rod that passes through the vertical sliding groove in the radial direction. The two ends of the vertical sliding groove are respectively provided with limiting rods that can abut against the side surface of the locking rod. The belt tension adjustment cylinder is installed on the grinding head seat and its drive end is connected to the motor base plate. It is used to adjust the vertical position of the motor base plate to adjust the belt tension. The motor base plate locking cylinder is installed on the grinding head seat and the drive end is rotatably connected to a rotating block. The rotating block is connected to the locking rod and is used to loosen or lock the motor base plate.

[0013] In one embodiment of the present invention, the hydrostatic bearing housing and the hydrostatic bearing cover each have a hydrostatic cavity including a plurality of hydrostatic grooves evenly distributed along the circumference of their respective through holes. Each hydrostatic groove has a water outlet hole on its bottom wall. The side ends of the hydrostatic bearing housing and the hydrostatic bearing are provided with their respective water outlet holes and corresponding water inlet holes. A water flow channel is formed between the corresponding water inlet holes and the water outlet holes.

[0014] In one embodiment of the present invention, the static pressure groove is fan-shaped.

[0015] This invention also provides a novel through-type hydrostatic groove grinding process, utilizing the aforementioned novel through-type hydrostatic groove grinding device, comprising: S1. Position the cylinder liner to be processed in the positioning fixture, and move the grinding head seat above the positioning fixture, so that the left end face of the grinding wheel is aligned with the left plane of the groove to be ground. S2. Start the drive motor, which drives the spindle to rotate via the pulley and belt, thereby driving the grinding wheel to rotate. At the same time, filtered clean water is introduced into the hydrostatic bearing housing and hydrostatic bearing cover, forming bidirectional hydrostatic pressure between the grinding wheel and the hydrostatic bearing housing and cover to provide axial rigid support for the grinding wheel end face and balance the dynamic grinding force. S3. Control the grinding head to drive the grinding wheel to perform rough grinding on the left plane of the groove to be ground with a feed rate of 0.04mm. During the rough grinding process, the grinding wheel moves from top to bottom and passes through the entire groove to be ground. After the rough grinding is completed, the grinding wheel retracts to eliminate the elastic deformation during the processing. Then, perform fine grinding of 0.01mm-0.02mm. During the fine grinding process, the grinding wheel moves from bottom to top. S4. Drive the grinding frame to move the grinding head seat so that the grinding wheel can grind the right plane of the groove to be ground. Repeat the rough grinding and fine grinding process of step S3. S5. After completing the rough and fine grinding of the left and right sides of the grinding groove, reset the grinding head seat and remove the processed cylinder liner.

[0016] The technical solution of the present invention has the following advantages compared with the prior art: The present invention discloses a novel through-type hydrostatic groove grinding device and process. By vertically arranging the grinding head seat and the through-type grinding wheel structure, the hydrostatic bearing assembly can extend into the workpiece, and the grinding wheel can penetrate the groove to complete the processing on both sides. This allows the workpiece to complete the rough and fine grinding of both sides of the groove in a single clamping, avoiding the multiple flipping and repeated clamping processes in the prior art, significantly improving processing efficiency, and eliminating the error of the tool step, thereby ensuring the continuity and flatness of the groove wall.

[0017] The grinding spindle of this invention adopts a self-feedback bidirectional hydrostatic bearing structure, combined with a radial mechanical rolling bearing, to ensure high rigidity and high precision of the CBN grinding wheel during high-speed rotation. The self-feedback bidirectional hydrostatic structure provides high-rigidity support for the grinding wheel end face, ensuring the stability and machining accuracy of the grinding wheel during grinding. By setting hydrostatic gaps between the two end faces of the grinding wheel and the hydrostatic bearing seat and hydrostatic bearing cover, and allowing filtered clean water to flow into the two hydrostatic chambers to form a self-feedback bidirectional hydrostatic system, the grinding wheel obtains high rigidity support and dynamic balance of axial force during high-speed rotation. Combined with the radial mechanical rolling bearing, this ensures the stability and high precision of the CBN grinding wheel during grinding, thereby improving the consistency of machining dimensions and the ability to control surface roughness.

[0018] The present invention divides the groove grinding process into rough grinding and fine grinding. The CBN grinding wheel is used to continuously process the left and right groove surfaces by reciprocating up and down, avoiding the error of the tool step, improving the processing quality, and the process allowance is reasonably allocated. Most of the allowance is removed by rough grinding, and then the surface quality and dimensional accuracy are controlled by fine grinding, so as to achieve both high efficiency and high quality. It significantly reduces the error of the tool step, improves the flatness of the groove surface and the processing consistency, and meets the needs of high-precision mass production of rotor compressors. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the axial structure of one side of the novel through-type hydrostatic pressure grinding device of the present invention.

[0021] Figure 2 This is a schematic diagram of the axial structure of the other side of the novel through-type hydrostatic pressure grinding device of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the cylinder liner to be processed according to the present invention.

[0023] Figure 4 This is a schematic diagram of the main structure of the novel through-type hydrostatic pressure grinding device of the present invention.

[0024] Figure 5 yes Figure 4 A cross-sectional view along the BB direction.

[0025] Figure 6 This is a first side view of the novel through-type hydrostatic pressure grinding device of the present invention.

[0026] Figure 7 This is a second side view of the novel through-type hydrostatic pressure grinding device of the present invention.

[0027] Figure 8a This is a schematic diagram of the structure of the novel through-type hydrostatic pressure grinding device (equipped with a grinding frame) of the present invention.

[0028] Figure 8b This is a schematic diagram of the structure of the grinding frame of the present invention.

[0029] Figure 9 This is a schematic diagram of the positioning tooling of the present invention.

[0030] Figure 10 This is a schematic diagram of the arrangement of the belt tension adjustment cylinder and the motor base plate locking cylinder of the present invention.

[0031] Figure 11 This is a schematic diagram of the axial structure of the hydrostatic bearing housing of the present invention.

[0032] Figure 12 This is a schematic diagram of the main structure of the hydrostatic bearing housing of the present invention.

[0033] Figure 13 This is a schematic diagram of the hydrostatic bearing housing structure of the present invention.

[0034] Figure 14 This is a schematic diagram of the axial structure of the hydrostatic bearing cover of the present invention.

[0035] Figure 15 This is a schematic diagram of the main structure of the hydrostatic bearing cover of the present invention.

[0036] Figure 16 This is a schematic diagram of the hydrostatic bearing cover structure of the present invention.

[0037] Explanation of reference numerals on the accompanying drawings: 100. Cylinder liner to be machined; 110. First positioning hole; 111. Second positioning hole; 113. Groove to be ground; 1. Positioning fixture; 11. Positioning seat; 11a. First through slot; 12. Worktable; 121. Second through slot; 13. Locking screw; 14. Clamping block; 141. Relief slot; 2. Grinding head seat; 21. Locking rod; 3. Grinding frame; 31. Reciprocating lifting assembly; 311. Base; 312. Vertical slide rail; 313. Vertical slide plate; 314. Vertical linear module; 32. Feed assembly; 321. Horizontal slide rail; 322. Horizontal slide plate; 323. Horizontal linear module; 4. Drive unit; 41. Motor base plate; 411. Vertical slide rail; 412. Limiting rod; 42. Drive motor; 43. Main shaft; 44. Pulley; 45. Belt; 5. Hydrostatic bearing assembly; 51. Hydrostatic bearing housing; 52. Hydrostatic bearing cover; 53. Pin; 54. Radial bearing; 55. Hydrostatic chamber; 56. Hydrostatic groove; 57. Water outlet; 58. Water inlet; 59. Water flow channel; 6. Grinding wheel; 7. Belt tension adjustment cylinder; 8. Motor base plate locking cylinder; 81. Rotating block. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0039] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0040] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0042] Reference Figures 1 to 3 As shown, a novel through-type hydrostatic groove grinding device of the present invention includes a cylinder liner 100 to be processed, comprising a first positioning hole 110 (large diameter hole), a second positioning hole 111 (small diameter hole), and a grinding groove 113 extending radially from the first positioning hole 110 to the second positioning hole 111. The device includes: Positioning fixture 1 includes a positioning seat 11 for positioning and placing the cylinder liner 100 to be processed; The grinding head holder 2 is vertically arranged above the positioning fixture 1; The grinding frame 3 is connected to the grinding head seat 2 and is used to drive the grinding head seat 2 to move up and down and to move horizontally. The drive device 4 includes a motor base plate 41 mounted on the vertical plane of the grinding head seat 2, a drive motor 42 mounted on the motor base plate 41, a main shaft 43 with its axis perpendicular to the motor base plate 41 and connected to the drive end of the drive motor 42, a pulley 44 mounted on the end of the main shaft 43, and a belt 45 mounted on the pulley 44 in a groove. The hydrostatic bearing assembly 5 includes a hydrostatic bearing housing 51 mounted on the grinding head seat 2, a hydrostatic bearing cover 52 that engages with the hydrostatic bearing housing 51 (which can be screwed), a pin 53 inserted between the through holes of the hydrostatic bearing housing 51 and the hydrostatic bearing cover 52 for preventing rotation, and a radial bearing 54 sleeved on the pin 53. The grinding wheel 6 is mounted on the outer diameter of the radial bearing 54. The belt 45 is sleeved in the groove of the outer diameter of the grinding wheel 6. The spindle 43 is connected to the grinding wheel 6 via the pulley 44 and the belt 45 to drive the grinding wheel 6 to rotate. The first positioning hole 110 allows the hydrostatic bearing assembly 5 to extend into it, and the grinding groove 113 allows the portion of the grinding wheel 6 extending out of the hydrostatic bearing assembly 5 to extend into it. The grinding wheel 6 has a predetermined static pressure gap between its two side end faces and the hydrostatic bearing seat 51 and the hydrostatic bearing cover 52, respectively, to form two static pressure cavities 55 with the same shape and area; the filtered clean water can flow into the corresponding two static pressure cavities 55 to form (self-feedback) bidirectional static pressure.

[0043] The vertical arrangement of the grinding head seat 2 and the through-type grinding wheel 6 grinding structure allows the hydrostatic bearing assembly 5 to extend into the workpiece, and the grinding wheel 6 to penetrate the groove to complete the processing on both sides. This enables the workpiece to complete the rough and fine grinding on both sides of the groove in one clamping, avoiding the multiple flipping and repeated clamping processes in the prior art, significantly improving the processing efficiency, and eliminating the error of the tool step, thereby ensuring the continuity and flatness of the groove wall.

[0044] In one embodiment, refer to Figures 11 to 16 As shown, the hydrostatic bearing housing 51 and the hydrostatic bearing cover 52 each have a hydrostatic chamber 55 that is connected to an external clean water supply system through a pipe. The clean water enters the hydrostatic chamber 55 after being precisely filtered.

[0045] Specifically, the hydrostatic bearing housing 51 and the hydrostatic bearing cover 52 each have a hydrostatic chamber 55 that includes a plurality of hydrostatic grooves 56 evenly distributed along the circumference of their respective through holes. Each hydrostatic groove 56 has a water outlet hole 57 on its bottom wall. The side ends of the hydrostatic bearing housing 51 and the hydrostatic bearing each have a water inlet hole 58 corresponding to the water outlet hole 57. A water flow channel 59 is formed between the corresponding water inlet hole 58 and the water outlet hole 57.

[0046] Specifically, the static pressure groove 56 is fan-shaped; the grinding wheel 6 is a CBN grinding wheel 6. The CBN grinding wheel 6 is a grinding tool made of cubic boron nitride (CBN) as abrasive and bonded by metal, resin, ceramic or electroplating agent.

[0047] In addition, the hydrostatic bearing housing and the hydrostatic bearing cover 52 are long and flat, extending vertically, to facilitate insertion into the first positioning hole 110.

[0048] Specifically, the hydrostatic gap between the two side end faces of the grinding wheel 6 and the hydrostatic bearing seat 51 and the hydrostatic bearing cover 52 is controlled to be between 0.01mm and 0.012mm.

[0049] By setting a static pressure gap of 0.01mm-0.012mm between the two end faces of the grinding wheel 6 and the static pressure bearing seat and the static pressure bearing cover, and by having filtered clean water flow into the two static pressure chambers 55 to form a self-feedback bidirectional static pressure, the grinding wheel 6 obtains high rigidity support and dynamic balance of axial force during high-speed rotation. Combined with the cooperation of the radial mechanical rolling bearing, the stability and high precision of the CBN grinding wheel 6 during the grinding process are guaranteed, thereby improving the consistency of machining dimensions and the ability to control surface roughness.

[0050] In addition, the evenly distributed fan-shaped static pressure grooves 56 structure and water flow channels 59 in the static pressure chambers 55 of the hydrostatic bearing housing 51 and the hydrostatic bearing cover 52 ensure the uniform distribution and stable supply of clean water in the static pressure chambers 55.

[0051] It should be further explained that a predetermined hydrostatic gap is left between the two end faces of the grinding wheel 6 and the hydrostatic bearing seat 51 and the hydrostatic bearing cover 52, respectively. A hydrostatic chamber 55 is formed in the two gaps by introducing precisely filtered clean water. This simultaneously establishes hydrostatic liquid films in both directions of the grinding wheel 6, which is equivalent to having fluid bearing capacity on both sides of the bearing. This ensures that the grinding wheel 6 receives balanced axial support during grinding, avoiding the offset or end face runout that might be caused by unilateral hydrostatic pressure, and improving the rotational stability and grinding accuracy of the grinding wheel 6.

[0052] Because the liquid film pressure in the hydrostatic chamber 55 automatically adjusts with the change in the clearance between the end face of the grinding wheel 6 and the bearing, a self-feedback bidirectional hydrostatic pressure is formed. That is, when the grinding wheel 6 is subjected to force during grinding, causing the end face to approach one side, the clearance of the hydrostatic chamber 55 on that side decreases, the water flow resistance increases, and the liquid film pressure rises accordingly, automatically generating a larger supporting force to offset the offset; the clearance of the hydrostatic chamber 55 on the other side increases, the water flow resistance decreases, and the liquid film pressure decreases accordingly, weakening the supporting force; in this way, the hydrostatic pressure in the two directions always maintains a dynamic balance, so that the end face of the grinding wheel 6 can maintain stable parallelism and rigidity even under high-speed rotation and stress.

[0053] Specifically, refer to Figure 9 As shown, it also includes a worktable 12, a locking screw 13 and a clamping block 14. The positioning fixture 1 is installed on the worktable 12. The positioning seat 11 is provided with a first through groove 11a that communicates with the grinding groove 113, the first positioning hole 110 and the second positioning hole 111. The worktable 12 is provided with a second through groove 121 that communicates with the first through groove 11a. The clamping block 14 is mounted on the positioning seat 11 via the locking screw 13, and can be clamped onto the upper surface of the cylinder liner 100 to be processed by the rotation of the locking screw 13. The clamping block 14 is provided with a relief groove 141 that matches the grinding groove 113.

[0054] The structural design of the positioning fixture 1, the worktable 12, the clamping block 14 and the clearance groove 141 not only ensures the stable and reliable positioning of the cylinder liner, but also enables the smooth discharge of grinding chips through the first through groove 11a and the second through groove 121, reducing the risk of chip jamming and burning, and further improving the reliability of the process.

[0055] In one embodiment, refer to Figure 8a , Figure 8b As shown, the grinding frame 3 includes a reciprocating lifting assembly 31 and a feeding assembly 32. The feeding assembly 32 is connected to the grinding head seat and is used to adjust the position of the grinding wheel relative to the positioning fixture. The reciprocating lifting assembly 31 is connected to the feeding assembly 32 and is used to realize the lifting movement of the grinding wheel.

[0056] For example, the reciprocating lifting assembly 31 includes a base 311, a vertical slide rail 312 disposed on the base 311, a vertical slide plate 313 slidably connected to the vertical slide rail 312, and a vertical linear module 314 (e.g., a servo screw assembly) for driving the vertical slide plate 313 to move.

[0057] The feed assembly 32 includes a horizontal slide rail 321 disposed on the vertical slide plate 313, a horizontal slide plate 322 slidably connected to the horizontal slide rail 321, and a horizontal linear module 323 (e.g., a servo screw assembly) for driving the horizontal slide plate 322 to move.

[0058] In one embodiment, refer to Figure 10 As shown, it also includes a belt tension adjustment cylinder 7 and a motor base plate locking cylinder 8; the motor base plate 41 is vertically adjustable on the vertical plane of the grinding head seat 2, the motor base plate 41 is provided with a vertical slide groove 411, the vertical plane of the grinding head seat 2 is connected to a locking rod 21 that passes radially through the vertical slide groove 411, and the two ends of the vertical slide groove 411 are respectively provided with limiting rods 412 that can abut against the side surface of the locking rod 21; the belt tension adjustment cylinder 7 is installed on the grinding head seat 2 and its driving end is connected to the motor base plate 41, and is used to adjust the vertical position of the motor base plate 41 to adjust the tension of the belt 45; the motor base plate locking cylinder 8 is installed on the grinding head seat 2 and its driving end is rotatably connected to a rotating block 8181, the rotating block 81 is connected to the locking rod 21, and is used to loosen or lock the motor base plate 41.

[0059] By using the belt tension adjustment cylinder 7 and the motor base plate locking cylinder 8, the tension of the belt 45 can be quickly adjusted as needed, and automatic loosening and tightening can be achieved when replacing the belt 45. This simplifies maintenance operations, shortens downtime for adjustment, and improves equipment operating efficiency and ease of use.

[0060] This embodiment also provides a novel through-type hydrostatic groove grinding process, utilizing the aforementioned novel through-type hydrostatic groove 56 grinding device, including: S1. Position the cylinder liner 100 to be processed in the positioning fixture 1. The grinding frame 3 drives the grinding head seat 2 to move above the positioning fixture 1, so that the left end face of the grinding wheel 6 is aligned with the left plane of the groove 113 to be ground. S2. Start the drive motor 42, which drives the spindle 43 to rotate via the pulley 44 and belt 45, thereby driving the grinding wheel 6 to rotate. At the same time, filtered clean water is introduced into the hydrostatic bearing housing 51 and the hydrostatic bearing cover 52 hydrostatic chamber 55, forming bidirectional hydrostatic pressure between the grinding wheel 6 and the hydrostatic bearing housing and hydrostatic bearing cover, so as to provide axial rigid support for the end face of the grinding wheel 6 and balance the dynamic grinding force. S3. Control the grinding frame 3 to drive the grinding wheel 6 to perform rough grinding on the left plane of the grinding groove 113 with a feed rate of 0.04mm. During the rough grinding process, the grinding wheel 6 moves from top to bottom and passes through the entire grinding groove 113. After the rough grinding is completed, the grinding wheel 6 retracts to eliminate the elastic deformation during the processing, and then performs fine grinding of 0.01mm-0.02mm. During the fine grinding process, the grinding wheel 6 moves from bottom to top. S4. Drive the grinding frame 3 to move the grinding head seat 2 so that the grinding wheel 6 can perform grinding on the right plane of the grinding groove 113. Repeat the rough grinding and fine grinding process of step S3. S5. After completing the rough and fine grinding on both sides of the grinding groove 113, the grinding head seat 2 is reset and the processed cylinder liner is taken out.

[0061] The reciprocating lifting assembly 3131 and the feed assembly 3232 of the grinding frame 3 enable the grinding wheel 6 to achieve a feed amount of 0.04mm and reciprocating motion. After rough grinding removes most of the excess material, it is combined with a fine grinding cutting amount of 0.01-0.02mm to achieve a reasonable distribution of the machining allowance, taking into account both machining efficiency and surface quality. This avoids surface defects caused by excessive cutting in a single operation, significantly reduces the error of the tool step, improves the flatness of the groove surface and the consistency of machining, and meets the needs of high-precision mass production of rotary compressors.

[0062] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A novel through-type hydrostatic pressure grinding device, characterized in that, include: The positioning fixture (1) includes a positioning seat (11) for positioning and placing the cylinder liner (100) to be processed. The cylinder liner (100) to be processed includes a first positioning hole (110), a second positioning hole (111), and a grinding groove (113) extending radially from the first positioning hole (110) to the second positioning hole (111). The grinding head seat (2) is arranged vertically above the positioning fixture (1); The grinding frame (3) is connected to the grinding head seat (2) and is used to drive the grinding head seat (2) to move up and down and to translate horizontally; The drive device (4) includes a motor base plate (41) mounted on the vertical plane of the grinding head seat (2), a drive motor (42) mounted on the motor base plate (41), a main shaft (43) with its axis perpendicular to the motor base plate (41) and connected to the drive end of the drive motor (42), a pulley (44) mounted on the end of the main shaft (43), and a belt (45) mounted on the pulley (44). The hydrostatic bearing assembly (5) includes a hydrostatic bearing housing (51) mounted on the grinding head seat (2), a hydrostatic bearing cover (52) that mates with the hydrostatic bearing housing (51), a pin (53) inserted between the through holes of the hydrostatic bearing housing (51) and the hydrostatic bearing cover (52) for preventing rotation, and a radial bearing (54) sleeved on the pin (53). The grinding wheel (6) is mounted on the outer diameter of the radial bearing (54), the belt (45) is sleeved in the groove of the outer diameter of the grinding wheel (6), and the spindle (43) is connected to the grinding wheel (6) via the pulley (44) and the belt (45) to drive the grinding wheel (6) to rotate. The first positioning hole (110) allows the hydrostatic bearing assembly (5) to extend into it, and the grinding groove (113) allows the grinding wheel (6) to extend into the part of the hydrostatic bearing assembly (5). The grinding wheel (6) has a predetermined static pressure gap between its two side end faces and the hydrostatic bearing seat (51) and the hydrostatic bearing cover (52) to form two static pressure cavities (55) with the same shape and area. The filtered clean water can flow into the corresponding two static pressure cavities (55) to form bidirectional static pressure. It also includes a worktable (12), a locking screw (13) and a clamping block (14). The positioning fixture (1) is installed on the worktable (12). The positioning seat (11) is provided with a first through groove (11a) that communicates with the grinding groove (113), the first positioning hole (110) and the second positioning hole (111). The worktable (12) is provided with a second through groove (121) that communicates with the first through groove (11a). The clamping block (14) is mounted on the positioning seat (11) by the locking screw (13), and can be clamped on the upper surface of the cylinder liner (100) to be processed by the rotation of the locking screw (13). The clamping block (14) is provided with a relief groove (141) that matches the grinding groove (113). The hydrostatic bearing housing (51) and the hydrostatic bearing cover (52) each have a hydrostatic chamber (55) including a plurality of hydrostatic grooves (56) evenly distributed along the circumference of their respective through holes. Each hydrostatic groove (56) has a water outlet hole (57) on its bottom wall. The side ends of the hydrostatic bearing housing (51) and the hydrostatic bearing cover (52) are provided with water inlet holes (58) that correspond one-to-one with their respective water outlet holes (57). A water flow channel (59) is formed between the corresponding water inlet holes (58) and the water outlet holes (57).

2. The novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, The hydrostatic bearing housing (51) and the hydrostatic bearing cover (52) are respectively connected to the external clean water supply system through pipes, and the clean water enters the hydrostatic bearing housing (55) after precision filtration.

3. The novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, The hydrostatic gap between the two side faces of the grinding wheel (6) and the hydrostatic bearing seat (51) and the hydrostatic bearing cover (52) is controlled to be 0.01mm-0.012mm.

4. A novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, The grinding frame (3) includes a reciprocating lifting assembly (31) and a feeding assembly (32). The feeding assembly (32) is connected to the grinding head seat (2) and is used to adjust the position of the grinding wheel (6) relative to the positioning fixture (1). The reciprocating lifting assembly (31) is connected to the feeding assembly (32) and is used to realize the lifting movement of the grinding wheel (6).

5. A novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, The grinding wheel (6) is a CBN grinding wheel (6).

6. A novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, It also includes a belt tension adjustment cylinder (7) and a motor base plate locking cylinder (8); The motor base plate (41) is vertically adjustable on the vertical plane of the grinding head seat (2). The motor base plate (41) is provided with a vertical slide groove (411). The vertical plane of the grinding head seat (2) is connected to a locking rod (21) that passes through the vertical slide groove (411) radially. The two ends of the vertical slide groove (411) are respectively provided with limiting rods (412) that can abut against the side surface of the locking rod (21). The belt tension adjustment cylinder (7) is installed on the grinding head seat (2) and its drive end is connected to the motor base plate (41). It is used to adjust the vertical position of the motor base plate (41) to adjust the tension of the belt (45). The motor base plate locking cylinder (8) is installed on the grinding head seat (2) and the drive end is rotatably connected to a rotating block (81). The rotating block (81) is connected to the locking rod (21) and is used to loosen or lock the motor base plate (41).

7. A novel through-type hydrostatic pressure grinding device according to claim 1, characterized in that, The static pressure groove (56) is fan-shaped.

8. A novel through-type hydrostatic groove grinding process, characterized in that, The novel through-type hydrostatic pressure grinding device according to any one of claims 1-7 comprises: S1. Position the cylinder liner (100) to be processed in the positioning fixture (1). The grinding frame (3) drives the grinding head seat (2) to move above the positioning fixture (1) and make the left end face of the grinding wheel (6) aligned with the left plane of the groove (113) to be ground. S2. Start the drive motor (42), which drives the spindle (43) to rotate via the pulley (44) and belt (45), thereby driving the grinding wheel (6) to rotate. At the same time, filtered clean water is introduced into the hydrostatic bearing housing (51) and the hydrostatic bearing cover (52) to form bidirectional hydrostatic pressure between the grinding wheel (6) and the hydrostatic bearing housing (51) and the hydrostatic bearing cover (52), so as to provide axial rigid support for the end face of the grinding wheel (6) and balance the dynamic grinding force. S3. Control the grinding frame (3) to drive the grinding wheel (6) to perform rough grinding on the left plane of the groove (113) to be ground with a feed rate of 0.04 mm. During the rough grinding process, the grinding wheel (6) moves from top to bottom and passes through the entire groove (113) to be ground. After the rough grinding is completed, the grinding wheel (6) retracts to eliminate the elastic deformation during the processing, and then performs fine grinding of 0.01 mm to 0.02 mm. During the fine grinding process, the grinding wheel (6) moves from bottom to top. S4. Drive the grinding frame (3) to move the grinding head seat (2) so that the grinding wheel (6) grinds the right plane of the groove to be ground (113), and repeat the rough grinding and fine grinding process of step S3. S5. After completing the rough and fine grinding of the left and right sides of the grinding groove (113), the grinding head seat (2) is reset and the processed cylinder liner is taken out.

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