Hydraulic cylinder barrel inner wall honing-rolling compound finishing process and processing equipment

Abstract

This invention discloses a honing-rolling composite finishing process and equipment for the inner wall of a hydraulic cylinder, relating to the field of honing and rolling equipment. This equipment utilizes a spiral convex plate to drive the introduced lubricating coolant downwards during processing. Simultaneously, the centrifugal force during rotation impacts the lubricating fluid against the inner wall of the cylinder, aiding fluid flow. Combined with the gap between the honing plates, the fluid flow path provided by the gap allows the honing debris to be quickly carried away from the processing position by the fluid, preventing heat buildup and residual iron filings that could cause scratches and ablation defects on the inner wall, thus improving workpiece processing quality.

Description

Technical Field

[0001] This invention specifically relates to a honing-rolling composite finishing process and equipment for the inner wall of a hydraulic cylinder, and pertains to the field of honing and rolling equipment. Background Technology

[0002] Hydraulic cylinders are core power actuators in fields such as engineering machinery, mining machinery, aerospace, and intelligent equipment. They are widely used in complex working environments with high pressure, heavy load, and reciprocating cycles. As the core component of a hydraulic cylinder, the cylinder barrel's inner wall machining accuracy, surface roughness, dimensional consistency, and surface mechanical properties directly determine the hydraulic cylinder's sealing performance, wear resistance, fatigue resistance, and overall service life. These are key factors in ensuring the stable, efficient, and leak-free operation of hydraulic systems. As the high-end equipment manufacturing industry rapidly develops towards high precision, long life, high reliability, and low energy consumption, the market's requirements for the machining quality of the hydraulic cylinder barrel's inner wall continue to increase. Conventional machining processes are no longer sufficient to meet the mass production needs of high-end cylinders.

[0003] A rigid honing device, disclosed in CN104972384B, includes a machine tool spindle, a honing head, an upper guide mechanism, and a lower guide mechanism. The upper guide mechanism includes an upper guide rod, and the lower guide mechanism includes a lower guide rod. The machine tool spindle is connected to the upper guide rod. The upper end of the honing head is connected to the upper guide rod, and the lower end of the honing head is connected to the lower guide rod. The axes of the upper guide rod, the honing head, and the lower guide rod coincide. This rigid honing device provides a fixed axis for the reciprocating and rotary motion of the honing head, solving the technical problem of workpiece holes being drum-shaped or S-shaped (vase-shaped) due to the long moving parts and large moment of inertia. This ensures that the honing head reciprocates and rotates along a fixed axis, achieving precise and efficient honing.

[0004] In existing equipment, the coolant and lubricant are guided to the honing position through a flow guide device. The flow force is used to carry and entrain the generated debris. However, there is no liquid flow at the honing position, which means that the generated debris cannot be carried away in time, causing scratches on the inner wall of the cylinder. Summary of the Invention

[0005] To address the aforementioned problems, a technical solution is proposed: a composite precision machining equipment for honing and rolling the inner wall of a hydraulic cylinder, comprising:

[0006] The base, and a grinding mechanism, a clamping mechanism and a dust extraction mechanism installed on the top of the base. The clamping mechanism is located inside the grinding mechanism, and the dust extraction mechanism is located directly below the workpiece clamping position of the clamping mechanism. A liquid pump is fixedly installed on the outside of the base, and the liquid inlet end of the liquid pump is connected to the dust extraction mechanism through a pipe.

[0007] The grinding mechanism includes side plates, each with a second hydraulic cylinder fixedly mounted on its inner wall. A top plate is fixedly mounted on the output end of each second hydraulic cylinder. A motor is fixedly mounted at the center of the top of the top plate, with its output end penetrating the top plate and extending to its bottom. A drive shaft is fixedly mounted on the motor's output end, and a cutter cylinder is fixedly mounted on the bottom end of the drive shaft. The cutter cylinder has upper and lower rectangular slots on both sides. An upper slider is slidably mounted in the upper rectangular slot, and a lower slider is slidably mounted in the lower rectangular slot. A convex plate is fixedly mounted on the outer side of the cutter cylinder. A rolling head is rotatably mounted on the non-opposing surfaces of the upper slider, and a rolling head is fixedly mounted on the non-opposing surfaces of the lower slider. The device is equipped with honing discs, which are located diagonally opposite to the non-opposing faces of the lower slide block, with a gap between the opposing faces of the honing discs. Spiral convex plates are evenly arranged on the outer side of the convex plate cylinder. Through the spiral convex plates, the convex plate cylinder can drive the introduced lubricating coolant downwards during processing. Simultaneously, the centrifugal force during rotation causes the lubricating fluid to impact the inner wall of the cylinder, assisting fluid flow. Combined with the gap between the honing discs, the fluid flow path provided by the gap allows the honing debris to be quickly carried away from the processing position by the fluid, avoiding internal wall scratches and ablation defects caused by heat accumulation and residual iron filings during processing, thus improving workpiece processing quality. The convex plate cylinder is located between the upper and lower slide blocks.

[0008] Preferably, a screw is rotatably mounted on the inner wall of the tool barrel, and a threaded ring is threadedly connected to the outer side of the screw. There are two threaded rings, and notches are provided on both sides of the threaded rings. A protrusion is provided on both sides of the inner wall of the tool barrel. The threaded rings slide and adapt to the protrusions of the tool barrel through the notches. A tapered cylinder is fixedly mounted on the non-opposing surfaces of the threaded rings. The outer diameter of the tapered cylinder gradually decreases as it moves away from the threaded rings. The opposing surfaces of the upper slider and the lower slider are both in contact with the outer side of the tapered cylinder.

[0009] Preferably, the clamping mechanism includes side support plates, and a first hydraulic cylinder is fixedly installed on each of the non-opposing surfaces of the side support plates. The output end of the first hydraulic cylinder passes through the side support plate and extends to the other side. A slide rail plate is fixedly installed between the side support plates. The slide rail plates are symmetrically installed along the center position of the axis of the side support plates, and slide rails are provided on the opposing surfaces of the slide rail plates. A sliding plate is slidably installed between the slide rail plates, and the non-opposing surfaces of the sliding plates are fixedly connected to the output end of the first hydraulic cylinder.

[0010] Preferably, side clamps are fixedly installed on the opposite surfaces of the sliding plates, and inner sliding plates are slidably installed on the inner walls of the side clamps. Clamping plates are fixedly installed on the opposite surfaces of the inner sliding plates. The clamping plates are made of flexible material, and an inner pad is fixedly installed between the non-opposing surfaces of the inner sliding plates and the inner walls of the side clamps. This composite buffer structure, utilizing flexible clamping plates and elastic inner pads, compared to traditional rigid clamping methods, can buffer clamping stress through the elastic structure when centering and clamping cylinder workpieces. This perfectly adapts to the clamping requirements of thin-walled, high-precision hydraulic cylinders, avoiding workpiece deformation caused by rigid clamping. Defects such as dents, indentations, and cracks on the outer wall are eliminated. The inner pad is made of elastic material. Side top plates are fixedly installed on both sides of the opposite side of the side clamping seat. The side top plates near the clamping plate are provided with arc-shaped protrusions. The side top plates with arc-shaped protrusions and rings on both sides of the side clamping seat can assist in positioning the outer side of the cylinder, preventing the cylinder clamping position from shifting. With the help of the sliding plate guided by the slide rail, the cylinder is smoothly fed and clamped, ensuring that there is no shaking or shifting during the processing of the workpiece. This improves the stability of the equipment during high-speed processing, reduces the scrap rate, and the arc-shaped protrusions are uniformly provided on the outer side.

[0011] Preferably, the dust extraction mechanism includes a fixed cylinder, a fixed ring is fixedly installed on the top of the fixed cylinder, an inner hole cover is fixedly installed on the inner wall of the fixed ring, the top of the inner hole cover has uniformly opened through holes, and a through groove plate is fixedly installed on the inner wall of the inner hole cover. The top of the through groove plate has uniformly opened through grooves, and a filter plate is fixedly installed on the top of the through groove plate. The top of the filter plate has uniformly opened filter holes.

[0012] Preferably, an outer cover is fixedly installed on the top of the fixing ring, an arc groove ring is fixedly installed on the inner wall of the outer cover, the top of the arc groove ring has evenly formed arc grooves, a top conical plate is fixedly installed on the inner wall of the arc groove ring, there is a gap between the bottom of the top conical plate and the top of the inner hole cover, an air vent cylinder is fixedly installed on the top of the fixing ring, an outer retaining ring is fixedly installed on the top of the outer cover, the top of the outer retaining ring is curved outward, the air vent cylinder is located inside the outer cover, the top of the air vent cylinder fits against the bottom of the arc groove ring, and the air vent cylinder is located inside the arc groove of the arc groove ring. The outer side of the vented cylinder is uniformly provided with vent holes, which are located between the inner hole cover and the top cone plate. An outer convex ring is fixedly installed on the outer side of the vented cylinder. The outer convex ring is located below the vent holes. Through the cooperation between the outer convex ring and the vent holes of the vented cylinder, after the liquid carries debris into the cylinder, the debris accumulates below the vent holes. At the same time, the outer convex ring blocks the accumulated debris, preventing the flow of liquid during the pumping process from carrying the accumulated debris closer to the vent holes and causing blockage. A connecting pipe is fixedly installed on the outer side of the fixed cylinder. The end of the connecting pipe away from the fixed cylinder is connected to the liquid inlet end of the pump.

[0013] A composite finishing process for honing and rolling the inner wall of a hydraulic cylinder consists of the following steps:

[0014] S1. Pre-treatment of cylinder barrel: Deburring and cleaning the inner hole of the hydraulic cylinder barrel after rough machining to remove oxide scale, iron filings and oil stains from the inner hole surface and ensure the cleanliness of the inner wall of the cylinder barrel.

[0015] S2. Honing and finishing: The cylinder inner wall is finely honed using composite precision machining equipment to optimize the micro-texture of the inner wall, eliminate local unevenness errors caused by rough honing, and improve the surface roughness, inner hole roundness and cylindricity of the cylinder inner wall.

[0016] S3. Roller rolling: The metal surface of the cylinder inner wall is extruded and plastically deformed by composite finishing equipment to fill the honing micro-textures and generate a cold-worked hardened layer on the metal surface of the inner wall, thus completing the composite finishing of the cylinder inner wall.

[0017] S4. Post-processing inspection: The inner wall of the cylinder is subjected to high-pressure rinsing and drying to remove residual impurities from the machining process. Then, the surface roughness, dimensional accuracy, geometric tolerances and hardened layer thickness of the inner wall are inspected to screen qualified finished cylinders.

[0018] After the cylinder pretreatment, it is necessary to check the roundness, cylindricity and dimensional allowance of the cylinder inner hole, screen qualified cylinders to be processed, and before honing, use honing strips to rough hone the inner wall of the cylinder to remove the tool marks, ripples and surface defects left after the cylinder precision boring, and correct the basic form and position tolerance of the inner hole.

[0019] This invention provides a composite finishing equipment for honing and rolling the inner wall of a hydraulic cylinder, which has the following advantages:

[0020] (i) The spiral convex plate cylinder can drive the introduced lubricating coolant to flow downward during the processing. At the same time, the centrifugal force during rotation causes the lubricating fluid to impact the inner wall of the cylinder, which assists the fluid flow. Combined with the gap between the honing plates, the fluid flow path provided by the gap allows the honing debris to be quickly carried away from the processing position by the fluid, avoiding the internal wall scratches and burning defects caused by heat accumulation and iron filings during the processing, thus improving the workpiece processing quality.

[0021] (ii) The composite buffer structure using flexible clamping plates and elastic inner pads can buffer the clamping stress when centering and clamping cylinder workpieces, compared with the traditional rigid clamping method. This perfectly adapts to the clamping requirements of thin-walled, high-precision hydraulic cylinders and avoids defects such as workpiece deformation, outer wall indentation and cracks caused by rigid clamping.

[0022] (III) The side top plates with arc-shaped protrusions and arc-shaped rings on both sides of the side clamping seat can be used to assist in positioning the outer side of the cylinder, preventing the cylinder clamping position from shifting. With the help of the sliding plate guided by the slide rail plate, the workpiece is fed and clamped smoothly, ensuring that there is no shaking or shifting during the processing of the workpiece, improving the stability of the equipment during high-speed processing, and reducing the scrap rate.

[0023] (iv) By cooperating with the vent hole of the vent tube through the outer convex ring, after the liquid carries the debris into the tube, the debris accumulates below the vent hole of the vent tube. At the same time, the outer convex ring blocks the accumulated debris, so as to prevent the flow of liquid during the pumping process from causing the accumulated debris to approach the vent hole and block the vent hole. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a side view of the overall structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the clamping mechanism of the present invention;

[0027] Figure 4 This is a partial structural schematic diagram of the clamping mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the dust extraction mechanism of the present invention;

[0029] Figure 6 This is a partial sectional view of the dust extraction mechanism of the present invention;

[0030] Figure 7 This is a partial sectional side view of the dust extraction mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the grinding mechanism of the present invention;

[0032] Figure 9 This is a partial structural schematic diagram of the grinding mechanism of the present invention;

[0033] Figure 10 This is a partial sectional view of the grinding mechanism of the present invention;

[0034] Figure 11 This is a schematic diagram of the process flow of the present invention.

[0035] In the diagram: 1. Base; 2. Tumbling mechanism; 3. Clamping mechanism; 4. Dust extraction mechanism; 5. Liquid pump; 21. Side plate; 22. Top plate; 23. Second hydraulic cylinder; 24. Motor; 25. Drive shaft; 26. Tool cylinder; 27. Convex plate cylinder; 28. Rolling head; 29. ​​Honing disc; 210. Upper slider; 211. Lower slider; 212. Threaded ring; 213. Conical cylinder; 214. Screw; 31. Side support plate; 32. First hydraulic cylinder; 33. Slide rail plate; 34. Clamping plate; 35. Sliding plate; 36. Side clamping seat; 37. Inner sliding plate; 38. Inner pad plate; 39. Side top plate; 41. Fixed cylinder; 42. Outer cover cylinder; 43. Connecting pipe; 44. Top cone plate; 45. Arc groove ring; 46. Outer retaining ring; 47. Fixed ring; 48. Air hole cylinder; 49. Outer convex ring; 410. Inner hole cover; 411. Through groove plate; 412. Filter plate. Detailed Implementation

[0036] Example 1, Reference Figures 1 to 2 and Figures 8 to 10 The present invention provides the following technical solution:

[0037] A composite finishing machine for honing and rolling the inner wall of a hydraulic cylinder barrel, comprising:

[0038] The base 1, and the grinding mechanism 2, clamping mechanism 3 and dust extraction mechanism 4 installed on the top of the base 1. The clamping mechanism 3 is located inside the grinding mechanism 2, and the dust extraction mechanism 4 is located directly below the workpiece clamping position of the clamping mechanism 3. A liquid pump 5 is fixedly installed on the outside of the base 1. The liquid inlet end of the liquid pump 5 is connected to the dust extraction mechanism 4 through a pipe.

[0039] The grinding mechanism 2 includes a side plate 21, with a second hydraulic cylinder 23 fixedly installed on the inner wall of each side plate 21. A top plate 22 is fixedly installed at the output end of the second hydraulic cylinder 23. A motor 24 is fixedly installed at the center of the top of the top plate 22. The output end of the motor 24 passes through the top plate 22 and extends to its bottom. A drive shaft 25 is fixedly installed at the output end of the motor 24. The output end of the second hydraulic cylinder 23 pushes the top plate 22 upwards and downwards smoothly, driving the motor 24 fixed at the top of the top plate 22, the drive shaft 25 connected to the output end of the motor 24, and the tool cylinder 26 at the bottom end of the drive shaft 25 to move downwards synchronously, so that the tool cylinder 26 smoothly extends into the internal cavity of the cylinder to be processed until it reaches the starting position of the inner wall processing of the cylinder. The second hydraulic cylinder 23 pauses its feed, completing the positioning of the machining mechanism. Based on the dimensions of the cylinder's inner wall, the screw 214, rotatably mounted on the inner wall of the tool cylinder 26, rotates. Two sets of threaded rings 212 on the outer side of the screw 214 form sliding limits with the protrusions on the inner wall of the tool cylinder 26 through notches. As the screw 214 rotates, they achieve axial synchronous displacement, causing the threaded rings 212 to move further apart, thus driving the outer fixed conical cylinder 213 to move synchronously. Utilizing the tapered surface structure of the outer circle of the conical cylinder 213, which gradually narrows from the inside out, it presses against the opposing inner end faces of the upper slider 210 and lower slider 211. Under pressure, the upper slider 210 and lower slider 211 slide outwards along the rectangular grooves on the upper and lower sides of the tool cylinder 26, respectively. The upper slider 210 drives the outer rotating rolling head 28 to expand outwards. The lower slider 211 drives the honing disc 29 fixed on the outside to expand outward. The fit and processing pressure of the honing disc 29, the rolling head 28, and the inner wall of the cylinder are precisely adjusted according to the actual inner diameter of the cylinder, adapting to the precision machining requirements of cylinders of different specifications. A tool cylinder 26 is fixedly installed at the bottom end of the drive shaft 25. Both sides of the tool cylinder 26 have upper and lower rectangular slots. An upper slider 210 is slidably installed in the upper rectangular slot, and a lower slider 211 is slidably installed in the lower rectangular slot. A convex plate cylinder 27 is fixedly installed on the outside of the tool cylinder 26. The rolling head 28 is rotatably installed on the non-opposing surfaces of the upper slider 210, and the honing disc 29 is fixedly installed on the non-opposing surfaces of the lower slider 211. The honing disc 29 is positioned diagonally opposite the non-opposing surfaces of the lower slider 211. During processing, the electric... Machine 24 drives the tool cylinder 26 to rotate at high speed via drive shaft 25. The rolling head 28 on the outer side of the upper slide block 210 rotates synchronously with the tool cylinder 26, continuously extruding and plastically deforming the metal surface of the honed cylinder inner wall, filling the honed micro-textures, and forming a work-hardened layer on the inner wall surface, improving the hardness, wear resistance, and smoothness of the inner wall. During rotation, the honing discs 29 diagonally arranged on the outer side of the lower slide block 211 first engage in high-speed friction cutting with the cylinder inner wall. Simultaneously, during processing, cooling lubricant is sprayed onto the processing position, and the rotating tool cylinder 26 drives the convex plate cylinder 27. The convex plate cylinder 27 has evenly arranged spiral convex plates on its outer side, causing the incoming liquid to flow rapidly downwards, and there is a gap between the opposite faces of the honing discs 29.Spiral protrusions are evenly distributed on the outer side of the convex plate cylinder 27, and the convex plate cylinder 27 is located between the upper slider 210 and the lower slider 211.

[0040] A screw 214 is rotatably mounted on the inner wall of the tool barrel 26. A threaded ring 212 is threadedly connected to the outer side of the screw 214. There are two threaded rings 212, and notches are opened on both sides of the threaded rings 212. Protrusions are provided on both sides of the inner wall of the tool barrel 26. The threaded rings 212 slide and adapt to the protrusions of the tool barrel 26 through the notches. A tapered cylinder 213 is fixedly installed on the non-opposing surfaces of the threaded rings 212. The outer diameter of the tapered cylinder 213 gradually decreases as it moves away from the threaded rings 212. The opposing surfaces of the upper slider 210 and the lower slider 211 are both in contact with the outer side of the tapered cylinder 213.

[0041] Example 2, based on Example 1, with reference to Figures 3 to 7 The clamping mechanism 3 includes a side support plate 31. A first hydraulic cylinder 32 is fixedly installed on the non-opposing surfaces of the side support plate 31. The output end of the first hydraulic cylinder 32 passes through the side support plate 31 and extends to the other side. A slide rail plate 33 is fixedly installed between the side support plates 31. The slide rail plates 33 are symmetrically installed at the center position of the axis of the side support plate 31, and slide rails are provided on the opposing surfaces of the slide rail plates 33. A sliding plate 35 is slidably installed between the slide rail plates 33. When the first hydraulic cylinder 32 on the outer side of the side support plate 31 is activated, the output end of the first hydraulic cylinder 32 passes through the side support plate 31 and pushes the sliding plate 35 to slide smoothly inward along the inner slide rail of the slide rail plate 33. The sliding plate 35 simultaneously drives the side clamping seat 36, the inner slide plate 37 and the flexible clamping plate 34 to move inward. The two clamping plates 34 fit against the outer wall of the cylinder to complete the centering clamping. The non-opposing surfaces of the sliding plate 35 are fixedly connected to the output end of the first hydraulic cylinder 32.

[0042] Side clamps 36 are fixedly installed on the opposite sides of the sliding plate 35. Inner slide plates 37 are slidably installed on the inner walls of the side clamps 36. Clamping plates 34 are fixedly installed on the opposite sides of the inner slide plates 37. The clamping plates 34 are made of flexible material. Inner pads 38 are fixedly installed between the non-opposing sides of the inner slide plates 37 and the inner walls of the side clamps 36. Inner pads 38 are made of elastic material. Side top plates 39 are fixedly installed on both sides of the opposite sides of the side clamps 36. The side top plates 39 near the clamping plates 34 are provided with arc-shaped protrusions. During clamping, the elastic inner pads 38 between the side clamps 36 and the inner slide plates 37 provide flexible buffer pre-tightening force to avoid damage to the workpiece by rigid clamping. The side top plates 39 on both sides of the side clamps 36 and the arc-shaped protrusions and arc-shaped rings on their surfaces position the cylinder. Arc-shaped rings are evenly provided on the outer side of the arc-shaped protrusions.

[0043] The dust extraction mechanism 4 includes a fixed cylinder 41, a fixed ring 47 fixedly installed on the top of the fixed cylinder 41, an inner hole cover 410 fixedly installed on the inner wall of the fixed ring 47, a through hole cover 410 with uniformly distributed through holes on the top of the inner hole cover 410, a through groove plate 411 fixedly installed on the inner wall of the inner hole cover 410, a through groove plate 411 with uniformly distributed through grooves on the top of the through groove plate 411, and a filter plate 412 fixedly installed on the top of the through groove plate 411, with filter holes uniformly distributed on the top of the filter plate 412.

[0044] An outer cover cylinder 42 is fixedly installed on the top of the fixed ring 47. An arc groove ring 45 is fixedly installed on the inner wall of the outer cover cylinder 42. The top of the arc groove ring 45 is evenly provided with arc grooves. A top cone plate 44 is fixedly installed on the inner wall of the arc groove ring 45. There is a gap between the bottom of the top cone plate 44 and the top of the inner hole cover 410. An air vent cylinder 48 is fixedly installed on the top of the fixed ring 47. An outer retaining ring 46 is fixedly installed on the top of the outer cover cylinder 42. The top of the outer retaining ring 46 is curved outward. The liquid pump 5 inlet is connected to the fixed cylinder 41 through the connecting pipe 43, so that a continuous negative pressure is formed inside the fixed cylinder 41 and the outer cover cylinder 42. The metal dust and fine abrasives generated during processing are carried down by the liquid and fall and collect. They are gathered by the arc-shaped constriction structure of the outer retaining ring 46 at the top of the outer cover cylinder 42. The liquid passes through the arc groove of the arc groove ring 45. The air vent cylinder 48 is located in the outer cover cylinder 47. Inside 2, the top of the vent cylinder 48 fits against the bottom of the arc groove ring 45, and the vent cylinder 48 is located inside the arc groove of the arc groove ring 45. The vent cylinder 48 has vent holes evenly opened on its outer side. After flowing through the gap between the top cone plate 44 and the inner hole cover 410, it enters the interior of the fixed cylinder 41 through the vent holes on the outer side of the vent cylinder 48. The impurities and dust in the liquid pass through the filter holes of the filter plate 412 and the through groove of the through groove plate 411 in sequence to complete multi-stage precise filtration. The clean liquid enters the liquid pump 5 through the connecting pipe 43 and is discharged and collected by the liquid pump 5. The vent hole is located between the inner hole cover 410 and the top cone plate 44. An outer convex ring 49 is fixedly installed on the outer side of the vent cylinder 48. The outer convex ring 49 is located below the vent hole. A connecting pipe 43 is fixedly installed on the outer side of the fixed cylinder 41. The end of the connecting pipe 43 away from the fixed cylinder 41 is connected to the liquid inlet end of the liquid pump 5.

[0045] Example 3, based on Examples 1 and 2, with reference to Figure 11 :

[0046] A composite finishing process for honing and rolling the inner wall of a hydraulic cylinder consists of the following steps:

[0047] S1. Pre-treatment of cylinder barrel: Deburring and cleaning the inner hole of the hydraulic cylinder barrel after rough machining to remove oxide scale, iron filings and oil stains from the inner hole surface and ensure the cleanliness of the inner wall of the cylinder barrel.

[0048] S2. Honing and finishing: The cylinder inner wall is finely honed using composite precision machining equipment to optimize the micro-texture of the inner wall, eliminate local unevenness errors caused by rough honing, and improve the surface roughness, inner hole roundness and cylindricity of the cylinder inner wall.

[0049] S3. Roller rolling: The metal surface of the cylinder inner wall is extruded and plastically deformed by composite finishing equipment to fill the honing micro-textures and generate a cold-worked hardened layer on the metal surface of the inner wall, thus completing the composite finishing of the cylinder inner wall.

[0050] S4. Post-processing inspection: The inner wall of the cylinder is subjected to high-pressure rinsing and drying to remove residual impurities from the machining process. Then, the surface roughness, dimensional accuracy, geometric tolerances and hardened layer thickness of the inner wall are inspected to screen qualified finished cylinders.

[0051] After the cylinder pretreatment, it is necessary to check the roundness, cylindricity and dimensional allowance of the cylinder inner hole, screen qualified cylinders to be processed, and before honing, use honing strips to rough hone the inner wall of the cylinder to remove the tool marks, ripples and surface defects left after the cylinder precision boring, and correct the basic form and position tolerance of the inner hole.

[0052] In use, the cylinder is clamped, fixed and positioned by the clamping mechanism 3, and then the cylinder is honed and rolled by the rolling mechanism 2. At the same time, the liquid pump 5 is started during the processing. The liquid pump 5 is connected to the dust extraction mechanism 4 so that the dust extraction mechanism 4 can collect the metal chips generated by the processing along the coolant below the cylinder.

[0053] In the clamping mechanism 3, the first hydraulic cylinder 32 on the outer side of the side support plate 31 is activated. The output end of the first hydraulic cylinder 32 passes through the side support plate 31 and pushes the sliding plate 35 to slide smoothly inward along the inner slide rail of the slide rail plate 33. The sliding plate 35 simultaneously drives the side clamping seat 36, the inner slide plate 37 and the flexible clamping plate 34 to move inward. The two clamping plates 34 fit against the outer wall of the cylinder to complete the centering and clamping. During the clamping process, the elastic inner pad plate 38 between the side clamping seat 36 and the inner slide plate 37 provides flexible buffer pre-tightening force to avoid damage to the workpiece by rigid clamping. The side top plates 39 on both sides of the side clamping seat 36 and the arc protrusion strips and arc protrusion rings on their surfaces position the cylinder.

[0054] In the tumbling mechanism 2, the second hydraulic cylinder 23 on the inner side of the side plate 21 pushes the top plate 22 downward smoothly from the output end of the second hydraulic cylinder 23, driving the motor 24 fixed at the top of the top plate 22, the transmission shaft 25 connected to the output end of the motor 24, and the tool cylinder 26 at the bottom end of the transmission shaft 25 to move downward synchronously as a whole, so that the tool cylinder 26 smoothly extends into the internal cavity of the cylinder to be processed until it reaches the starting position of the inner wall processing of the cylinder. The second hydraulic cylinder 23 stops feeding, and the processing mechanism is positioned. According to the size of the inner wall of the cylinder, the tool cylinder 26 is rotated. The screw 214 is rotatably mounted on the inner wall. Two sets of threaded rings 212 on the outer side of the screw 214 form a sliding limit with the protrusion on the inner wall of the tool cylinder 26 through notches. As the screw 214 rotates, it achieves axial synchronous displacement. The threaded rings 212 move away from each other, driving the outer fixed conical cylinder 213 to move synchronously. Utilizing the tapered surface structure of the outer circle of the conical cylinder 213, which gradually narrows from the inside to the outside, it respectively presses against the relative inner end faces of the upper slider 210 and the lower slider 211. After being subjected to force, the upper slider 210 and the lower slider 211 move along the tool cylinder 26. The rectangular grooves on the upper and lower sides slide outwards. The upper slider 210 drives the outer rotating roller head 28 to expand outwards, and the lower slider 211 drives the outer fixed honing disc 29 to expand outwards. The fit and processing pressure between the honing disc 29, the roller head 28 and the inner wall of the cylinder are precisely adjusted according to the actual inner diameter of the cylinder to meet the precision machining requirements of cylinders of different specifications. During machining, the motor 24 drives the tool cylinder 26 to rotate at high speed through the transmission shaft 25. The roller head 28 on the outer side of the upper slider 210 rotates synchronously with the tool cylinder 26 to hone and finish the cylinder. The inner wall metal surface of the cylinder undergoes continuous extrusion plastic deformation to fill the honing micro-textures, forming a cold-worked hardened layer on the inner wall surface metal, thereby improving the hardness, wear resistance, and smoothness of the inner wall. During rotation, the honing discs 29 diagonally arranged on the outer side of the lower slide block 211 first engage in high-speed friction cutting with the inner wall of the cylinder. Simultaneously, during the processing, cooling lubricant is sprayed onto the processing position, and the convex plate cylinder 27 is driven as the tool cylinder 26 rotates. The convex plate cylinder 27 is equipped with spiral convex plates evenly arranged on its outer side, which drive the incoming liquid to flow rapidly downwards.

[0055] In the dust extraction mechanism 4, the liquid pump 5 is connected to the fixed cylinder 41 through the connecting pipe 43, so that a continuous negative pressure is formed inside the fixed cylinder 41 and the outer cover cylinder 42. The metal dust and fine abrasives generated during processing are carried down by the liquid and fall and gather. They are gathered by the arc-shaped constriction structure of the outer baffle ring 46 at the top of the outer cover cylinder 42. The liquid passes through the arc groove of the arc groove ring 45, flows through the gap between the top cone plate 44 and the inner hole cover 410, and enters the interior of the fixed cylinder 41 through the air hole on the outside of the air hole cylinder 48. The impurities and dust in the liquid pass through the filter holes of the filter plate 412 and the through groove of the through groove plate 411 to complete multi-stage precise filtration. The clean liquid enters the liquid pump 5 through the connecting pipe 43 and is discharged and collected by the liquid pump 5.

Claims

1. A composite precision machining equipment for honing and rolling the inner wall of a hydraulic cylinder barrel, characterized in that, include: The base (1) and the grinding mechanism (2), clamping mechanism (3) and dust extraction mechanism (4) installed on the top of the base (1), the clamping mechanism (3) is located inside the grinding mechanism (2), the dust extraction mechanism (4) is located directly below the workpiece clamping position of the clamping mechanism (3), and a liquid pump (5) is fixedly installed on the outside of the base (1), the liquid inlet end of the liquid pump (5) is connected to the dust extraction mechanism (4) through a pipe; The grinding mechanism (2) includes a side plate (21). A second hydraulic cylinder (23) is fixedly installed on the inner wall of the side plate (21). A top plate (22) is fixedly installed at the output end of the second hydraulic cylinder (23). A motor (24) is fixedly installed at the center of the top of the top plate (22). The output end of the motor (24) passes through the top plate (22) and extends to its bottom. A drive shaft (25) is fixedly installed at the output end of the motor (24). A cutter cylinder (26) is fixedly installed at the bottom end of the drive shaft (25). Both sides of the cutter cylinder (26) have upper and lower rectangular slots, and a sliding groove is installed in the upper rectangular slot. The upper slider (210) has a lower slider (211) slidably installed in the rectangular groove below. A convex plate cylinder (27) is fixedly installed on the outside of the tool cylinder (26). Roller heads (28) are rotatably installed on the non-opposing surfaces of the upper slider (210). Honing discs (29) are fixedly installed on the non-opposing surfaces of the lower slider (211). The honing discs (29) are diagonally mounted on the non-opposing surfaces of the lower slider (211), and there is a gap between the opposing surfaces of the honing discs (29). Spiral convex plates are uniformly arranged on the outside of the convex plate cylinder (27), and the convex plate cylinder (27) is located between the upper slider (210) and the lower slider (211).

2. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 1, characterized in that: The inner wall of the cutter barrel (26) is rotatably mounted with a screw (214), and the outer side of the screw (214) is threaded with a threaded ring (212). There are two threaded rings (212), and both sides of the threaded rings (212) are provided with notches. Both sides of the inner wall of the tool barrel (26) are provided with protrusions. The threaded ring (212) slides and adapts to the protrusions of the tool barrel (26) through a notch. The non-opposing surfaces of the threaded ring (212) are fixedly installed with tapered cylinders (213). The outer diameter of the tapered cylinder (213) gradually decreases as it moves away from the threaded ring (212). The opposing surfaces of the upper slider (210) and the lower slider (211) are both in contact with the outer side of the tapered cylinder (213).

3. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 2, characterized in that: The clamping mechanism (3) includes a side support plate (31), and a first hydraulic cylinder (32) is fixedly installed on the non-opposing surfaces of the side support plate (31). The output end of the first hydraulic cylinder (32) passes through the side support plate (31) and extends to the other side. A slide rail plate (33) is fixedly installed between the side support plates (31). The slide rail plate (33) is symmetrically installed along the center position of the axis of the side support plate (31), and slide rails are provided on the opposite surfaces of the slide rail plate (33). A sliding plate (35) is slidably installed between the slide rail plates (33). The non-opposing surfaces of the sliding plate (35) are fixedly connected to the output end of the first oil cylinder (32).

4. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 3, characterized in that: Side clamps (36) are fixedly installed on the opposite sides of the sliding plate (35). Inner slide plates (37) are slidably installed on the inner walls of the side clamps (36). Clamping plates (34) are fixedly installed on the opposite sides of the inner slide plates (37). The clamping plates (34) are made of flexible material. An inner pad (38) is fixedly installed between the non-opposing side of the inner slide plates (37) and the inner wall of the side clamps (36). The inner pad (38) is made of elastic material. Side top plates (39) are fixedly installed on both sides of the opposite sides of the side clamps (36). An arc-shaped protrusion is provided on the side of the side top plate (39) near the clamping plate (34), and an arc-shaped protrusion ring is uniformly provided on the outer side of the arc-shaped protrusion.

5. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 4, characterized in that: The dust extraction mechanism (4) includes a fixed cylinder (41), a fixed ring (47) is fixedly installed on the top of the fixed cylinder (41), an inner hole cover (410) is fixedly installed on the inner wall of the fixed ring (47), the top of the inner hole cover (410) is uniformly provided with through holes, and a through groove plate (411) is fixedly installed on the inner wall of the inner hole cover (410), the top of the through groove plate (411) is uniformly provided with through grooves, and a filter plate (412) is fixedly installed on the top of the through groove plate (411), and filter holes are uniformly provided on the top of the filter plate (412).

6. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 5, characterized in that: An outer cover cylinder (42) is fixedly installed on the top of the fixed ring (47). An arc groove ring (45) is fixedly installed on the inner wall of the outer cover cylinder (42). An arc groove is evenly opened on the top of the arc groove ring (45). A top cone plate (44) is fixedly installed on the inner wall of the arc groove ring (45). There is a gap between the bottom of the top cone plate (44) and the top of the inner hole cover (410). An air hole cylinder (48) is fixedly installed on the top of the fixed ring (47). An outer retaining ring (46) is fixedly installed on the top of the outer cover cylinder (42). The top end of the outer retaining ring (46) is curved outward.

7. The hydraulic cylinder barrel inner wall honing-rolling composite precision machining equipment according to claim 6, characterized in that: The vent cylinder (48) is located inside the outer cover cylinder (42). The top of the vent cylinder (48) is in contact with the bottom of the arc groove ring (45), and the vent cylinder (48) is located inside the arc groove of the arc groove ring (45). The vent cylinder (48) has vent holes evenly opened on its outer side, and the vent holes are located between the inner hole cover (410) and the top cone plate (44). An outer convex ring (49) is fixedly installed on the outer side of the vent cylinder (48). The outer convex ring (49) is located below the vent holes. A connecting pipe (43) is fixedly installed on the outer side of the fixed cylinder (41). The end of the connecting pipe (43) away from the fixed cylinder (41) is connected to the liquid inlet end of the liquid pump (5).

8. A composite finishing process for honing and rolling the inner wall of a hydraulic cylinder barrel, characterized in that, It consists of the following steps: S1. Pre-treatment of cylinder barrel: Deburring and cleaning the inner hole of the hydraulic cylinder barrel after rough machining to remove oxide scale, iron filings and oil stains from the inner hole surface and ensure the cleanliness of the inner wall of the cylinder barrel. S2. Honing and finishing: The cylinder inner wall is finely honed using composite precision machining equipment to optimize the micro-texture of the inner wall, eliminate local unevenness errors caused by rough honing, and improve the surface roughness, inner hole roundness and cylindricity of the cylinder inner wall. S3. Roller rolling: The metal surface of the cylinder inner wall is extruded and plastically deformed by composite finishing equipment to fill the honing micro-textures and generate a cold-worked hardened layer on the metal surface of the inner wall, thus completing the composite finishing of the cylinder inner wall. S4. Post-processing inspection: The inner wall of the cylinder is subjected to high-pressure rinsing and drying to remove residual impurities from the machining process. Then, the surface roughness, dimensional accuracy, geometric tolerances and hardened layer thickness of the inner wall are inspected to screen qualified finished cylinders.

9. The composite finishing process of honing and rolling the inner wall of a hydraulic cylinder according to claim 8, characterized in that: After the cylinder pretreatment, it is necessary to check the roundness, cylindricity and dimensional allowance of the cylinder bore and select qualified cylinders to be processed.

10. The hydraulic cylinder barrel inner wall honing-rolling composite finishing process according to claim 9, characterized in that: Before honing, honing bars are used to rough hone the inner wall of the cylinder to remove tool marks, ripples and surface defects remaining after the cylinder is precision boring, and to correct the basic form and position tolerances of the inner hole.

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