A processing method of an oil cylinder and the oil cylinder

Abstract

The application relates to a machining method of an oil cylinder and the oil cylinder. The machining method of the oil cylinder comprises the following steps: a process thread hole is arranged at a small-diameter end of the oil cylinder to be machined, one end of a double-end screw rod is assembled with the process thread hole, the other end is assembled with a positioning disc of a lathe, a large-diameter end of the oil cylinder to be machined is assembled with an umbrella-shaped tailstock installed at a tailstock of the lathe, the oil cylinder to be machined is attached to an end surface of a four-jaw chuck of the lathe, and a locking nut and the four-jaw chuck are tightened; an adjusting screw rod is arranged between the four-jaw chuck and a shoulder surface of the oil cylinder to be machined, the adjusting screw rod and the four-jaw chuck are adjusted respectively, so that the run-out of the large-diameter end and a large-diameter end inner hole of the oil cylinder to be machined is less than or equal to 0.02; the large-diameter end of the oil cylinder to be machined is turned, and a first hole diameter section, a second hole diameter section and a third hole diameter section of the oil cylinder to be machined are turned. The application further provides an oil cylinder which is machined by the machining method. The application solves the problems of low machining precision and efficiency and high cost in the existing machining method of the oil cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a machining method of an oil cylinder and the oil cylinder. BACKGROUND

[0002] In a marine low-speed diesel engine, the exhaust valve assembly is one of its core components, and the oil cylinder is an important part indispensable in the exhaust valve assembly. The marine low-speed diesel engine usually adopts the working principle of two-stroke or four-stroke, and the exhaust stroke is to discharge the burned exhaust gas from the cylinder to provide space for the next working cycle. In this process, the opening and closing timing of the exhaust valve is crucial to the performance and efficiency of the engine. The role of the oil cylinder in the exhaust valve assembly is mainly to provide power support for the movement of the exhaust valve, therefore, the machining precision of the oil cylinder is crucial.

[0003] However, there are many difficulties in the machining of the oil cylinder: the external shape of the oil cylinder is an irregularly shaped body of revolution, and its inner hole is a stepped hole system with a length-diameter ratio greater than 13, which belongs to the category of deep hole machining. In addition, the shape and position tolerance requirements of the three holes and one end face of the oil cylinder are extremely high, and the machining difficulty is great. The traditional machining process usually uses a horizontal machining center for boring machining, first machining the reference surface, then positioning with the reference surface, and machining after the pressure plate is pressed tightly. However, this method is prone to vibration during machining, resulting in waviness or uneven size on the machined surface, thereby having the problem of low machining precision, and boring machining requires multiple processes (such as rough boring, semi-fine boring, fine boring, honing, etc.), which leads to low machining efficiency and high cost. Therefore, with the increasing demand for oil cylinder products, it is urgent to seek a process method with high machining precision and efficiency and low cost. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a machining method of an oil cylinder and the oil cylinder to solve the problems of low machining precision and efficiency and high cost in the existing machining method of the oil cylinder.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A machining method of an oil cylinder, comprising the following steps:

[0007] S1, a process threaded hole is arranged at the small-diameter end of the oil cylinder to be machined, one end of a double-headed screw rod is assembled and fixed with the process threaded hole, the other end of the double-headed screw rod is assembled and fixed with the positioning disc of the lathe through a locking nut, the large-diameter end of the oil cylinder to be machined is assembled and fixed with the umbrella-shaped tailstock mounted on the tailstock of the lathe, the end face of the oil cylinder to be machined is attached to the end face of the four-jaw chuck of the lathe, and the locking nut and the four-jaw chuck are tightened, so as to realize the clamping of the oil cylinder to be machined under the action of the pulling force of the double-headed screw rod and the clamping force of the four-jaw chuck;

[0008] S2, an adjusting screw is arranged between the four-jaw chuck and the shoulder surface of the to-be-processed oil cylinder, the run-out of the large-diameter end of the to-be-processed oil cylinder is adjusted to be less than or equal to 0.02 by adjusting the adjusting screw, and the run-out of the inner hole of the large-diameter end of the to-be-processed oil cylinder is adjusted to be less than or equal to 0.02 by adjusting the claws of the four-jaw chuck, so as to realize the alignment of the to-be-processed oil cylinder.

[0009] S3, the large-diameter end of the to-be-processed oil cylinder is turned, so that the flatness of the large-diameter end is less than or equal to 0.05, and the first hole diameter section, the second hole diameter section and the third hole diameter section of the to-be-processed oil cylinder are sequentially turned from the large-diameter end of the to-be-processed oil cylinder, so as to realize the turning processing of the to-be-processed oil cylinder.

[0010] The diameter of the first hole diameter section is greater than that of the second hole diameter section, and the diameter of the second hole diameter section is greater than that of the third hole diameter section.

[0011] According to the above technical means, the stable clamping of the to-be-processed oil cylinder is realized through the cooperation of the double-headed screw, the positioning disc of the lathe, the umbrella-shaped tailstock and the four-jaw chuck. At the same time, the position of the to-be-processed oil cylinder can be accurately adjusted through the adjusting screw and the claws of the four-jaw chuck, so that the run-out of the large-diameter end and the inner hole of the to-be-processed oil cylinder is controlled in a very small range (less than or equal to 0.02), thereby ensuring the processing precision. The method realizes a continuous and efficient processing process by sequentially processing the large-diameter end and each hole diameter section of the to-be-processed oil cylinder through turning. At the same time, since the position and run-out of the to-be-processed oil cylinder can be accurately controlled during the processing, the processing error and waste rate can be reduced, and the processing efficiency can be further improved. The method is suitable for oil cylinder processing of different specifications and sizes, and only needs to adjust the relevant parameters such as the double-headed screw, the adjusting screw and the four-jaw chuck according to the specific size and requirements of the to-be-processed oil cylinder. Therefore, the method has high flexibility and universality. The method ensures the stability and reliability of the to-be-processed oil cylinder during the processing through the accurate clamping and alignment process. At the same time, since the standardized process flow and equipment are adopted during the processing, the stability and consistency of the processing quality can be ensured. Thus, the problems of low processing precision and efficiency and high cost existing in the existing oil cylinder processing method are effectively solved.

[0012] Preferably, in the S2, the adjusting screw comprises a double-headed stud and shoulder nuts arranged at both ends of the double-headed stud, and the force acting on the shoulder surface of the to-be-processed oil cylinder is adjusted by adjusting the shoulder nuts, so as to adjust the run-out of the large-diameter end of the to-be-processed oil cylinder.

[0013] Preferably, in the S2, the adjusting screw comprises a double-headed stud and shoulder nuts arranged at both ends of the double-headed stud, and the force acting on the shoulder surface of the to-be-processed oil cylinder is adjusted by adjusting the shoulder nuts, so as to adjust the run-out of the large-diameter end of the to-be-processed oil cylinder.

[0014] Because the cylinder has an uneven surface, direct clamping with a lathe chuck cannot guarantee stability. Therefore, an adjusting screw is cleverly designed. By rotating the shoulder nut on the adjusting screw, the force on the shoulder surface of the cylinder can be adjusted, thereby adjusting the runout of the large end face. This makes it easy to align the large end face of the cylinder.

[0015] Preferably, step S3 specifically includes:

[0016] S31. Use a clamping tool to turn the large-diameter end of the cylinder to be machined, so that the flatness of the large-diameter end is ≤0.05;

[0017] S32. Using a clamping tool, turn the first bore section of the cylinder to be machined from the large diameter end of the cylinder to be machined, leaving a allowance of 0.4mm, and then turn the chamfer of the first bore section.

[0018] S33. Use an anti-vibration turning tool to machine the second bore section of the cylinder to be machined, leaving a allowance of 0.7mm;

[0019] S34. Use an anti-vibration turning tool to machine the third bore section of the hydraulic cylinder to be machined, leaving a allowance of 0.7mm.

[0020] By cleverly combining indexable inserts and anti-vibration turning tools, the dimensional and shape accuracy of each bore section of the hydraulic cylinder is effectively ensured. Especially when turning the large-diameter end and bore sections, the machining allowance can be strictly controlled, thus guaranteeing the precision requirements of the final product. The turning process with indexable inserts and anti-vibration turning tools is smooth, reducing cutting forces and vibrations, avoiding burrs and scratches, and significantly improving the surface quality of the hydraulic cylinder. This method, through reasonable process arrangement and tool selection, enables fast and efficient machining, shortening the production cycle and improving production efficiency. This method is applicable to the machining of hydraulic cylinders of different specifications and sizes; only the tools and machining parameters need to be adjusted, demonstrating strong flexibility and adaptability.

[0021] Preferably, in step S31, when using a clamping tool to turn the large-diameter end of the cylinder to be machined, the process is completed in two cuts with the same allowance for both cuts, removing 0.5mm of allowance each time.

[0022] By using a two-cut process, the cutting force and heat during turning are effectively controlled, avoiding the problems of excessive tool wear and workpiece deformation caused by removing a large amount of material at once, thus improving machining accuracy and surface quality. The two cuts remove the same amount of material, 0.5mm each time. This uniform cutting method helps maintain the stability of the cutting process, reducing vibration and noise caused by uneven cutting amounts, further improving machining efficiency and workpiece quality. In summary, this machining method achieves high-precision, high-quality hydraulic cylinder machining through a precise cutting strategy, while ensuring the stability and efficiency of the machining process.

[0023] Preferably, in step S32, when using a clamping tool to turn the first bore section of the hydraulic cylinder to be processed, the process is completed in two passes: the first pass removes 0.5mm of excess material, and the second pass removes 0.3mm of excess material.

[0024] By machining the first bore section in two passes, cutting force and temperature are effectively controlled. The first pass removes 0.5mm of material, rapidly reducing the size of the machined area and laying the foundation for subsequent precision machining. The second pass removes 0.3mm of material, further ensuring machining accuracy and surface quality, while reducing vibration and heat accumulation caused by removing too much material at once, thus improving the stability and safety of the machining process. Furthermore, the two-pass machining method facilitates tool heat dissipation and chip removal, extending tool life and reducing production costs. Simultaneously, this machining method is simple to operate, easily automatable, and contributes to improved production efficiency and machining quality.

[0025] Preferably, in step S33, when turning the second bore section of the hydraulic cylinder to be machined using an anti-vibration turning tool, the process is completed in two passes: the first pass removes 0.5mm of excess material, and the second pass removes 0.3mm of excess material.

[0026] When turning the second bore section of the hydraulic cylinder using an anti-vibration turning tool, a two-cut approach allows for more precise control of the machining allowance. The first cut removes 0.5mm of allowance, effectively reducing the amount of material cut per pass, lowering cutting force and heat, thereby minimizing workpiece deformation and vibration and improving machining accuracy. The second cut removes another 0.3mm of allowance, further refining the bore diameter to ensure it meets design requirements. This step-by-step cutting method not only improves machining efficiency but also guarantees machining quality, contributing to the production of high-precision hydraulic cylinder products.

[0027] Preferably, in step S34, when turning the third bore section of the hydraulic cylinder to be machined using an anti-vibration turning tool, the process is completed in three cuts: the first cut removes 0.9mm of excess material, the second cut removes 0.8mm of excess material, and the third cut removes 0.3mm of excess material.

[0028] When machining the third bore section of the hydraulic cylinder using a vibration-damping tool, a three-cut approach was employed to achieve precise machining control. The first cut removes 0.9mm of material, rapidly reducing the initial machining clearance and providing a stable reference for subsequent machining. The second cut removes 0.8mm of material, further approximating the final dimension while reducing the potential impact of cutting forces on the cylinder. The third cut removes 0.3mm of material, ensuring machining accuracy and achieving the required bore diameter, while also reducing vibration and heat that could arise from excessive single-cutting depth of cut, thus improving the quality and finish of the machined surface. This three-cut machining method not only improves machining efficiency but also significantly enhances the machining accuracy and surface quality of the hydraulic cylinder, contributing to extended cylinder lifespan and improved performance.

[0029] Preferably, the anti-vibration turning tool includes a tool holder, one end of which is equipped with a tool body, and the other end is used to be mounted on the tool turret of the lathe;

[0030] The side wall of the tool holder is provided with screws for clamping the tool body.

[0031] By mounting the tool body to one end of the tool holder and the other end to the lathe turret, lathe operation and machining are facilitated. Screws on the side wall of the tool holder effectively clamp the tool body, ensuring its stability during machining, reducing vibration, and improving machining accuracy. The use of this vibration-resistant lathe tool effectively resists vibration during machining, protecting the lathe and workpiece, extending the lathe's service life, and simultaneously improving machining efficiency and product quality.

[0032] Preferably, in S32 and S33, when the machine-clamped tool is replaced with an anti-vibration turning tool, only the Z-axis is retracted, and the X-axis is not moved.

[0033] Preferably, in S33 and S34, only the tool body of the anti-vibration turning tool needs to be replaced.

[0034] When changing the cutting tool, only the Z-axis is retracted, and the X-axis is not moved. This effectively avoids the adverse effects of machine tool reset errors on the machining accuracy of the hydraulic cylinder, thereby improving the machining accuracy of the hydraulic cylinder.

[0035] The present invention also provides a hydraulic cylinder, which is manufactured using the processing method described in the present invention.

[0036] The beneficial effects of this invention are:

[0037] The hydraulic cylinder machining method of this invention utilizes the synergistic effect of a double-ended screw, a lathe positioning plate, an umbrella-shaped tip on the tailstock, and a four-jaw chuck to effectively achieve stable clamping of the hydraulic cylinder workpiece. By adjusting the screw and the jaws of the four-jaw chuck, the hydraulic cylinder to be machined is precisely positioned, ensuring that the runout of its large-diameter end and inner hole is strictly controlled within an extremely small range (≤0.02mm), thereby guaranteeing machining accuracy. Using turning technology, the large-diameter end and each hole section of the hydraulic cylinder workpiece are machined sequentially, achieving continuity and high efficiency in the machining process. Due to the precise control of the position and runout of the hydraulic cylinder workpiece during machining, we can reduce machining errors and scrap rates, further improving machining efficiency. This machining method is applicable to hydraulic cylinders of various specifications and sizes; by simply adjusting the parameters of the double-ended screw, adjusting the screw, and the four-jaw chuck according to specific dimensions and requirements, flexible application and wide applicability can be achieved. Through precise clamping and positioning, the stability and reliability of the hydraulic cylinder workpiece during machining are ensured. Meanwhile, the standardized process flow and equipment use ensure the stability and consistency of processing quality, which has promotion and application value in the field of machining technology. Attached Figure Description

[0038] Figure 1 A schematic diagram of the structure for clamping the hydraulic cylinder to be processed;

[0039] Figure 2 This is a schematic diagram of the structure of the hydraulic cylinder to be processed;

[0040] Figure 3 This is a schematic diagram of the adjusting screw.

[0041] Figure 4 This is a schematic diagram of the structure of an anti-vibration lathe tool;

[0042] Figure 5 for Figure 4 The left view;

[0043] Among them, 1-cylinder to be processed, 11-small diameter end, 12-process threaded hole, 13-large diameter end, 14-shoulder surface, 15-inner hole of large diameter end, 16-first diameter section, 17-second diameter section, 18-third diameter section; 2-double-ended screw; 3-positioning plate; 4-locking nut; 5-umbrella-shaped tip; 6-four-jaw chuck; 7-adjusting screw, 71-double-ended stud, 72-shoulder nut; 8-vibration-resistant cutting tool, 81-tool holder, 82-tool body, 83-screw. Detailed Implementation

[0044] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] The present invention aims to disclose a grinding fixture for thin-walled parts and a thin-walled part, so as to solve the problems of easy deformation and low precision of the oil inlet valve of the existing common rail injection oil in the fine grinding process.

[0047] Among them, such as Figures 1 to 5 As shown, a method for machining a hydraulic cylinder includes the following steps:

[0048] S1. Clamping: A process threaded hole 12 is set at the small diameter end 11 of the cylinder 1 to be processed. One end of the double-ended screw 2 is assembled and fixed with the process threaded hole 12. The other end of the double-ended screw 2 is assembled and fixed with the positioning plate 3 of the lathe by the locking nut 4. The large diameter end 13 of the cylinder 1 to be processed is assembled and fixed with the umbrella-shaped center 5 installed on the tailstock of the lathe. The cylinder 1 to be processed is fitted with the end face of the four-jaw chuck 6 of the lathe, and the locking nut 4 and the four-jaw chuck 6 are tightened so that the cylinder 1 to be processed is clamped under the action of the pulling force of the double-ended screw 2 and the clamping force of the four-jaw chuck 6.

[0049] S2. Alignment: After clamping, remove the umbrella-shaped center 5 installed on the tailstock of the lathe. Set an adjusting screw 7 between the four-jaw chuck 6 and the shoulder surface 14 of the cylinder to be processed. Adjust the adjusting screw 7 so that the runout of the large diameter end 13 of the cylinder to be processed is ≤0.02. Adjust the jaws of the four-jaw chuck 6 so that the runout of the large diameter end inner hole 15 of the cylinder to be processed is ≤0.02, thereby achieving alignment of the cylinder to be processed.

[0050] S3. Turning: Turn the large diameter end 13 of the cylinder 1 to be processed, so that the flatness of the large diameter end 13 is ≤0.05. Turn the first diameter section 16, the second diameter section 17 and the third diameter section 18 of the cylinder 1 to be processed in sequence from the large diameter end 13 to realize the turning process of the cylinder 1 to be processed.

[0051] The diameter of the first aperture section 16 is larger than that of the second aperture section 17, and the diameter of the second aperture section 17 is larger than that of the third aperture section 18.

[0052] By cooperating with a double-ended screw, a lathe positioning plate, an umbrella-shaped center mounted on the tailstock, and a four-jaw chuck, a stable clamping of the hydraulic cylinder to be machined is achieved. Simultaneously, by adjusting the screw and the jaws of the four-jaw chuck, the position of the hydraulic cylinder can be precisely adjusted, keeping the runout of its large-diameter end and inner bore within a minimal range (≤0.02), thus ensuring machining accuracy. This method, through turning, sequentially machines the large-diameter end and various bore sections of the hydraulic cylinder, achieving a continuous and efficient machining process. Furthermore, because the position and runout of the hydraulic cylinder can be precisely controlled during machining, machining errors and scrap rates are reduced, further improving machining efficiency. This method is applicable to machining hydraulic cylinders of different specifications and sizes; only the relevant parameters of the double-ended screw, adjusting screw, and four-jaw chuck need to be adjusted according to the specific dimensions and requirements of the hydraulic cylinder to be machined. Therefore, this method has high flexibility and versatility. Through precise clamping and alignment, this method ensures the stability and reliability of the hydraulic cylinder during machining. Meanwhile, because standardized processes and equipment are used in the processing, the stability and consistency of processing quality can be ensured.

[0053] Among them, the small diameter end 11 refers to the end face of the oil cylinder 1 to be processed with a smaller diameter along the axial direction, and the large diameter end 13 refers to the end face of the oil cylinder 1 to be processed with a larger diameter along the axial direction.

[0054] Because the cylinder has an uneven shape, direct clamping with a lathe chuck cannot guarantee clamping stability. Therefore, an M20 process thread hole 12 is designed in the center of the small diameter end 11 of the cylinder to be processed. An M20 double-ended screw 2 is used, and one end of the double-ended screw 2 is connected to the process thread hole 12 of the cylinder to be processed. The other end of the double-ended screw 2 passes through the spindle hole of the lathe, and a positioning plate 3 and a locking nut 4 are installed in sequence. The double-ended screw 2 is screwed into the process thread hole 12 of the cylinder 1 to be processed. The tailstock of the lathe is equipped with an umbrella-shaped tip 5, which is pressed against the hole of the large diameter end 13 of the cylinder 1 to be processed. The tip 5 is pressed tightly so that the small diameter end 11 of the cylinder 1 to be processed is completely flat against the end face of the four-jaw chuck 6 of the lathe, thus achieving an automatic centering effect. At the same time, the locking nut 4 is tightened, and then the four-jaw chuck 6 is gradually tightened. This allows the cylinder 1 to obtain the clamping forces of the double-ended screw 2 and the clamping force of the four-jaw chuck 6, so as to effectively clamp the irregularly shaped cylinder.

[0055] In some embodiments, in S2, the adjusting screw 7 includes a double-ended stud 71 and shoulder nuts 72 disposed at both ends of the double-ended stud 71. By adjusting the shoulder nuts 72, the force on the shoulder surface 14 of the cylinder to be processed is adjusted, thereby adjusting the runout of the large diameter end 13 of the cylinder to be processed.

[0056] After the hydraulic cylinder 1 to be processed is clamped, an adjusting screw 7 is installed between the end face of the four-jaw chuck 6 and the shoulder surface 14 of the hydraulic cylinder 1 to be processed. Then, a dial indicator is used to measure the runout of the large-diameter end 13 of the hydraulic cylinder 1 to be processed. If the runout is too large, the shoulder nut 72 on the adjusting screw 7 is rotated to adjust the force on the shoulder surface 14 of the hydraulic cylinder 1 to adjust the runout of the large-diameter end 13, so that the runout of the large-diameter end 13 of the hydraulic cylinder 1 to be processed is ≤0.02. After the large-diameter end 13 is aligned, the dial indicator is re-set to align the inner hole of the large-diameter end 13 of the hydraulic cylinder 1 to be processed. The four jaws of the four-jaw chuck 6 are adjusted individually to align the runout of the inner hole of the large-diameter end 13 of the hydraulic cylinder 1 to be processed is ≤0.02.

[0057] In some embodiments, S3 specifically includes:

[0058] S31. Use a clamping tool to turn the large diameter end 13 of the hydraulic cylinder 1 to be processed, so that the flatness of the large diameter end 13 is ≤0.05, so as to serve as the starting reference surface for subsequent deep hole processing, and thus accurately control the depth dimension.

[0059] S32. Using a clamping tool, turn the first bore section 16 of the cylinder 1 to be processed from the large diameter end 13, leaving a margin of 0.4mm. The diameter of the first bore section 16 is 180mm. Then turn the chamfer of the first bore section 16.

[0060] S33. Use the anti-vibration turning tool 8 to turn the second bore section 17 of the hydraulic cylinder 1 to be machined, leaving a margin of 0.7mm. The diameter of the second bore section 17 is 76mm.

[0061] S34. Use the anti-vibration turning tool 8 to turn the third bore section 18 of the hydraulic cylinder 1 to be machined, leaving a margin of 0.7mm. The diameter of the third bore section 18 is 27mm.

[0062] In some embodiments, during S31, when turning the large diameter end 13 of the hydraulic cylinder 1 to be machined using a conventional machine tool, the machining is completed in two cuts with the same allowance for both cuts, removing 0.5mm of allowance each time.

[0063] In some embodiments, during S32, when turning the first bore section 16 of the hydraulic cylinder 1 to be machined using a conventional machine tool, the process is completed in two cuts: the first cut removes 0.5mm of excess material, and the second cut removes 0.3mm of excess material.

[0064] In S31 and S32, the tool change is automatically performed by the turret and controlled by the CNC program.

[0065] In some embodiments, in S33, since the anti-vibration turning tool 8 is too long to achieve automatic tool changing of the turret, the ordinary machine-clamped tool is manually replaced with the anti-vibration turning tool 8. When turning the second diameter section 17 of the hydraulic cylinder 1 to be machined using the anti-vibration turning tool 8, it is done in two cuts. The first cut removes 0.5mm of the allowance, and the second cut removes 0.3mm of the allowance.

[0066] In some embodiments, during S34, when the anti-vibration turning tool 8 is used to turn the third bore section 18 of the hydraulic cylinder 1 to be machined, it is done in three cuts: the first cut removes 0.9mm of the allowance, the second cut removes 0.8mm of the allowance, and the third cut removes 0.3mm of the allowance.

[0067] In some embodiments, the anti-vibration turning tool 8 includes a tool holder 81, one end of which is equipped with a tool body 82, and the other end is used to be mounted on the tool turret of the lathe.

[0068] The side wall of the tool holder 81 is provided with screws 83 for clamping the tool body 82.

[0069] For example, the anti-vibration turning tool 8 differs from ordinary indexable tools in that: the diameter of the tool shank 81 is 5mm smaller than the diameter of the second bore section 17, and the length of the tool shank 81 is 10mm greater than the maximum depth of the stepped hole of the hydraulic cylinder 1 to be machined, so as to ensure both the tool's passability and chip removal, as well as the tool's rigidity (length-to-diameter ratio < 8). One end of the tool shank 81 is designed with a precision mounting hole for mating with the cylindrical part of the tool body 82 to assemble and fix the tool body 82. The side wall of the tool shank 81 has two M6 threaded through holes spaced 10mm apart at positions corresponding to the precision mounting hole. The cylindrical part of the tool body 82 is designed with a flat shape 5mm wide and 20mm long, so that after the tool body 82 is installed in the precision mounting hole of the tool shank 81, it is locked and pressed with two M6 socket head cap screws 83. The other end of the tool shank 81 is designed as a cuboid with a thickness of 40mm and a length of 150mm for mounting on the lathe's turret.

[0070] In some embodiments, during S32 and S33, when manually replacing the machine-clamped tool with the anti-vibration turning tool 8, only the Z-axis is retracted, and the X-axis is not moved. This is to avoid the adverse effects of machine tool reset errors on the machining accuracy of the hydraulic cylinder, thereby improving the machining accuracy of the hydraulic cylinder.

[0071] In some embodiments, a hydraulic cylinder is also provided, which is manufactured using the processing method described in any of the above embodiments.

[0072] Through the design and implementation of this method, the intermediate stepped hole system of the hydraulic cylinder (including the first, second, and third hole diameter sections) can be machined in a single setup on a CNC lathe. This achieves the stringent requirements of coaxiality of the three holes (including the first, second, and third hole diameter sections) within 0.02 and perpendicularity of the large end face to the three holes within 0.01, completely replacing the machining of the hydraulic cylinder on a horizontal machining center. Furthermore, actual calculations show that this machining method significantly reduces the machining cost of the hydraulic cylinder, saving approximately 230 yuan per piece. If a company processes 3000 hydraulic cylinders annually, the annual saving would be 690,000 yuan, greatly reducing processing costs.

[0073] In summary, the cylinder machining method of this invention achieves stable clamping of the cylinder to be machined through the cooperation of a double-ended screw, a lathe positioning plate, an umbrella-shaped tip mounted on the tailstock, and a four-jaw chuck. Simultaneously, by adjusting the screw and the jaws of the four-jaw chuck, the position of the cylinder to be machined can be precisely adjusted, ensuring that the runout of its large-diameter end and inner hole is controlled within a very small range (≤0.02), thus guaranteeing machining accuracy. This method, through turning, sequentially machines the large-diameter end and each hole section of the cylinder to be machined, achieving a continuous and efficient machining process. Furthermore, because the position and runout of the cylinder to be machined can be precisely controlled during machining, machining errors and scrap rates can be reduced, further improving machining efficiency. This method is applicable to the machining of cylinders of different specifications and sizes; only the relevant parameters such as the double-ended screw, adjusting screw, and four-jaw chuck need to be adjusted according to the specific dimensions and requirements of the cylinder to be machined. Therefore, this method has high flexibility and versatility. Through precise clamping and alignment, this method ensures the stability and reliability of the cylinder to be machined during the machining process. Furthermore, the standardized processes and equipment used in the manufacturing process ensure the stability and consistency of processing quality. This technology has significant potential for widespread application in the field of machining.

[0074] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for machining a hydraulic cylinder, characterized in that, Includes the following steps: S1. Set a process thread hole (12) at the small diameter end (11) of the cylinder to be processed (1). Use one end of a double-ended screw (2) to assemble and fix it with the process thread hole (12). Use a lock nut (4) to assemble and fix the other end of the double-ended screw (2) to the positioning plate (3) of the lathe. Assemble and fix the large diameter end (13) of the cylinder to be processed (1) to the umbrella-shaped tip (5) installed on the tailstock of the lathe. Fit the end face of the cylinder to be processed (1) with the four-jaw chuck (6) of the lathe. Tighten the lock nut (4) and the four-jaw chuck (6) so that the cylinder to be processed (1) can be clamped under the action of the tension of the double-ended screw (2) and the clamping force of the four-jaw chuck (6). S2. An adjusting screw (7) is provided between the four-jaw chuck (6) and the shoulder surface (14) of the cylinder to be processed (1). The adjusting screw (7) is adjusted so that the runout of the large diameter end (13) of the cylinder to be processed is ≤0.

02. The jaws of the four-jaw chuck (6) are adjusted so that the runout of the inner hole (15) of the large diameter end of the cylinder to be processed is ≤0.02, thereby achieving the alignment of the cylinder to be processed (1). S3. Turn the large diameter end (13) of the cylinder to be processed (1) so that the flatness of the large diameter end (13) is ≤0.

05. Turn the first diameter section (16), the second diameter section (17) and the third diameter section (18) of the cylinder to be processed (1) in sequence from the large diameter end (13) of the cylinder to be processed (1) to realize the turning process of the cylinder to be processed (1); The diameter of the first aperture segment (16) is larger than that of the second aperture segment (17), and the diameter of the second aperture segment (17) is larger than that of the third aperture segment (18).

2. The method for processing a hydraulic cylinder according to claim 1, characterized in that, In S2, the adjusting screw (7) includes a double-ended stud (71) and a shoulder nut (72) set at both ends of the double-ended stud (71). By adjusting the shoulder nut (72), the force on the shoulder surface (14) of the cylinder to be processed (1) is adjusted, thereby realizing the adjustment of the runout of the large diameter end (13) of the cylinder to be processed (1).

3. The method for processing a hydraulic cylinder according to claim 1, characterized in that, Specifically, S3 includes: S31. Use a clamping tool to turn the large diameter end (13) of the hydraulic cylinder (1) to be processed, so that the flatness of the large diameter end (13) is ≤0.05; S32. Using a clamping tool, turn the first bore section (16) of the cylinder (1) from the large diameter end (13) of the cylinder (1) to be processed, leaving a margin of 0.4mm, and then turn the chamfer of the first bore section (16); S33. Use an anti-vibration turning tool (8) to turn the second bore section (17) of the hydraulic cylinder (1) to be machined, leaving a margin of 0.7mm; S34. Use an anti-vibration turning tool (8) to turn the third bore section (18) of the hydraulic cylinder (1) to be machined, leaving a margin of 0.7mm.

4. The method for processing a hydraulic cylinder according to claim 3, characterized in that, In S31, when using a clamping tool to turn the large diameter end (13) of the hydraulic cylinder (1) to be processed, it is done in two cuts with the same allowance for both cuts, removing 0.5mm of allowance each time.

5. The method for processing a hydraulic cylinder according to claim 3, characterized in that, In S32, when the first bore section (16) of the hydraulic cylinder (1) to be machined is turned using a clamping tool, it is done in two cuts. The first cut removes 0.5mm of excess material, and the second cut removes 0.3mm of excess material.

6. The method for processing a hydraulic cylinder according to claim 3, characterized in that, In S33, when the anti-vibration turning tool (8) is used to turn the second bore section (17) of the cylinder (1) to be machined, it is done in two cuts. The first cut removes 0.5mm of the excess material, and the second cut removes 0.3mm of the excess material.

7. The method for processing a hydraulic cylinder according to claim 3, characterized in that, In S34, when the anti-vibration turning tool (8) is used to turn the third bore section (18) of the cylinder (1) to be processed, it is done in three cuts. The first cut removes 0.9mm of the remaining material, the second cut removes 0.8mm of the remaining material, and the third cut removes 0.3mm of the remaining material.

8. The method for processing a hydraulic cylinder according to claim 3, characterized in that, The anti-vibration turning tool (8) includes a tool holder (81), one end of which is equipped with a tool body (82), and the other end is used to be mounted on the turret of the lathe. The side wall of the blade holder (81) is provided with screws (83) for pressing the blade body (82).

9. The method for processing a hydraulic cylinder according to claim 3, characterized in that, In S32 and S33, when the clamped tool is replaced with an anti-vibration turning tool (8), only the Z-axis is retracted and the X-axis is not moved; And / or, in S33 and S34, only the tool body (82) of the anti-vibration cutting tool (8) needs to be replaced.

10. A hydraulic cylinder, characterized in that, It is obtained by processing using the processing method described in any one of claims 1 to 9.

Images