Machining method and machining tool for hydraulic cylinder barrel with mounting structure at cylinder opening part

Abstract

The invention provides a machining method and a machining tool for a hydraulic cylinder barrel with a mounting structure at a cylinder opening part. The machining method comprises the following steps: blanking; a lateral supporting plate, a longitudinal plate and an arc-shaped connecting plate in the rib plate assembly are welded into a frame in advance, the frame is welded to a cylinder barrel, then a bottom plate is welded to the frame, and an upper cavity connector base is welded to the cylinder barrel; milling a positioning plane and a bottom plate fixing hole of the bottom plate; inner holes in the two ends of the cylinder barrel are supported, and a groove of the groove end of the cylinder barrel is turned; scraping and rolling an inner hole of the cylinder barrel; supporting inner holes in the two ends of the cylinder barrel, flattening the cylinder opening end face of the cylinder barrel, turning a cylinder opening end frame nest of the cylinder barrel, erecting the cylinder opening end frame nest, and turning threads and spigots in the inner holes by utilizing a damping cutter bar; the upper cavity joint hole is aligned and drilled through; sawing off the lengthened cylinder barrel by taking the end face of the bottom plate as a reference; and by taking the outer circular surface of the cylinder barrel as a reference, milling the end surface after the lengthened cylinder barrel is removed, and milling the inner chamfer of the cylinder barrel. The method solves the problems that when the inner hole is machined, a cylinder opening frame nest cannot be formed, an inner spigot cannot be machined, the welding efficiency is low, and the machining precision is low.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic oil cylinders, and in particular to a method and tooling for processing a hydraulic cylinder barrel with a mounting structure at a cylinder mouth. Background Art

[0002] There are three main methods for installing hydraulic cylinders in the existing technology. The first is to hinge the bottom and piston rod of the hydraulic cylinder to provide a high degree of freedom. The second is to position the hydraulic cylinder using the cylinder trunnion. The third is to fix the cylinder barrel with a structural rib to increase its stability during use.

[0003] However, when using structural ribs to fix and install the hydraulic cylinder barrel, the following problems will arise. First, the structural ribs, joint seats and other accessories have the characteristics of large welding volume and high welding heat. After the cylinder barrel accessories are welded to the cylinder barrel, they will be affected by the welding heat, and the inner hole of the cylinder barrel will shrink and deform. Welding needs to be performed before fine machining of the inner hole of the cylinder barrel, that is, after welding is completed, the inner hole is scraped and rolled, and the inner stop is machined. Since the length of some structural ribs will exceed the cylinder mouth, it is impossible to position the scraper with the cylinder mouth chamfer when scraping and rolling, and it is impossible to open a frame nest at the cylinder mouth when turning the stop, making the stop processing difficult. Second, the support plate in the traditional structural rib plate adopts the line welding method, and the accessories are welded directly on the cylinder barrel, which has the disadvantages of low welding efficiency, cumbersome operation steps, and a large part of the welding heat is transferred to the cylinder barrel. Third, when using an extended tool rod to process the stop, the tool rod needs to extend too much, and the tool rod vibrates violently when processing the stop thread and sealing surface. In addition, the accessory is biased toward one side of the cylinder and will be biased toward one side when rotating at high speed, which increases the difficulty of processing and causes the dimensional accuracy and roughness to fail to meet the drawing requirements. Summary of the Invention

[0004] In order to overcome the problems of being unable to open a cylinder mouth frame socket and process an inner stop when machining an inner hole of a cylinder with a rib plate, low welding efficiency of the rib plate, and low machining accuracy, the technical solution adopted by the present invention is: a method for machining a hydraulic cylinder with a mounting structure at the cylinder mouth, comprising the following steps: For blanking, the length of the finished cylinder, the minimum length of the cylinder end frame required by the equipment, the length of the rib assembly extending beyond the finished cylinder, the interference distance between the rib assembly and the center frame, and the blanking head length are accumulated in sequence to obtain the blanking size of the cylinder and perform blanking. After leveling the inner holes of the two ends of the cylinder after the inverted support is cut, the left and right end surfaces of the cylinder are leveled and chamfered; Welding the upper cavity: pre-weld the lateral support plates, longitudinal plates, and arc-shaped connecting plates in the rib plate assembly into a frame, and weld the frame to the cylinder barrel with the groove end of the cylinder barrel in a positioning manner. Then, weld the bottom plate to the frame, and weld the upper cavity joint seat to the cylinder barrel. The milling drill uses the outer cylindrical surface of the cylinder as a reference to mill the positioning plane and the bottom plate fixing hole of the bottom plate; Two-level inverted support the inner holes at both ends of the cylinder, repair the cylinder end bevel of the cylinder, and machine the tail bevel; The scraper is positioned and clamped by chamfering the two ends of the cylinder, and the rib plate assembly is placed upward to scrape the inner hole of the cylinder; Turning stoppers to support the inner holes at both ends of the cylinder, leveling the end surface of the cylinder port, repairing the support sockets at the cylinder port end, using a center frame to support the support sockets at the cylinder port end, withdrawing the tailstock chuck, and turning threads and stoppers in the inner hole of the cylinder using a damping tool rod; Align the upper cavity joint hole and drill through it; The sawing is based on the end surface of the bottom plate and the extended cylinder is sawed off; The milling and drilling process uses the outer diameter of the cylinder as a reference, milling the end face after removing the extended cylinder and milling the inner chamfer of the cylinder. In other words, during the milling and drilling step, because one end of the rib assembly will extend beyond the end face of the cylinder after the extended cylinder is sawed off, the end face cannot be machined. Instead, it can only be machined to the finished product using the outer diameter as a reference by milling the end face.

[0005] Based on the above, the damping tool rod is a damping tool rod with a diameter of Φ50 mm and a processing aspect ratio of 20 times.

[0006] Beneficial effect: When machining the inner hole of the cylinder, the damping tool rod is used to machine the inner stop, which can solve the problem of tool vibration, and can also ensure that the roughness is controlled within Ra1.6 and the runout is controlled within 0.06mm, providing machining accuracy.

[0007] Based on the above, between the welding rib plate assembly and joint seat step and the milling drilling, aging and shot blasting treatment are also included, with an aging temperature of 400°C to 500°C, a holding time of 4h to 5h, and a surface roughness of Ra2.5µm to 5µm after shot blasting.

[0008] The present invention also provides a hydraulic cylinder barrel processing tool with a mounting structure at the cylinder mouth, comprising a base, a plurality of first clamping block groups, a plurality of second clamping block groups, and a plurality of third clamping block groups; A plurality of first clamping block groups are arranged around the base, and are used to clamp and position the lateral support plate; A plurality of second clamping block groups are arranged on the longitudinal side of the base, for clamping and positioning the longitudinal plate; A plurality of third clamping block groups are arranged on the lateral side of the base, and are used to clamp and position the arc-shaped connecting plate; A plurality of the first clamping block groups, a plurality of the second clamping block groups, and a plurality of the third clamping block groups surround and position the lateral support plates, the longitudinal plates, and the arcuate connecting plates, so that the lateral support plates, the longitudinal plates, and the arcuate connecting plates are welded into a frame.

[0009] Based on the above, the plurality of second clamping block groups and the plurality of third clamping block groups are arranged perpendicularly.

[0010] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the present invention provides a hydraulic cylinder barrel processing method and processing tooling with a mounting structure at the cylinder mouth. By analyzing various factors affecting the inner hole of the cylinder barrel with a ribbed plate and combining the clamping difficulties in the processing of the inner hole of the cylinder barrel with a ribbed plate, a sequence of processing steps is designed that can meet the clamping accuracy and safety requirements, and can also effectively avoid the influence of subsequent welding and processing on the accuracy of the cylinder barrel inner hole.

[0011] Specifically, in the hydraulic cylinder processing method with a mounting structure at the cylinder mouth provided by the present invention, a processing tool is first designed to assist in splicing the rib plate assembly. The rib plate assembly is assembled and welded on the processing tool, and then the rib plate assembly is welded as a whole to the cylinder barrel. On the one hand, the efficiency and welding accuracy of welding the rib plate on the cylinder barrel are improved. On the other hand, it also avoids excessive welding heat from being transferred to the cylinder barrel, thereby reducing the thermal impact on the cylinder barrel.

[0012] At the same time, combined with the position of the rib assembly on the cylinder, a frame allowance is left at the cylinder mouth when cutting and welding the cylinder in advance, and the groove end is used for positioning welding. After the inner stop is processed, the end face is sawed and milled to the drawing size.

[0013] Furthermore, in order to solve the problem of tool vibration during machining, a damping tool rod is used to machine the inner stop when machining the inner hole of the cylinder, which can ensure that the roughness is controlled within Ra1.6 and the runout is controlled within 0.06mm, thereby improving the machining accuracy.

[0014] By adjusting the above processing technology and processing tools, the problems of being unable to open the cylinder mouth frame socket and process the inner stop when processing the inner hole of the cylinder with ribbed plates, low welding efficiency of the ribbed plates, and low processing accuracy are overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the finished structure of a hydraulic cylinder barrel with a mounting structure at the cylinder mouth provided by the present invention and a cylinder barrel with a ribbed plate in a processing tool.

[0016] Figure 2 The present invention provides a method for processing a hydraulic cylinder with a mounting structure at the cylinder mouth and a schematic diagram of the side structure of the finished cylinder in the processing tooling.

[0017] Figure 3 The present invention provides a method for processing a hydraulic cylinder with a mounting structure at the cylinder mouth and a schematic diagram of the cross-sectional structure of the cylinder in the processing tooling.

[0018] Figure 4 It is a schematic diagram of a hydraulic cylinder barrel processing method with a mounting structure at the cylinder mouth portion provided by the present invention and a cylinder barrel structure after welding ribs in a processing tool.

[0019] Figure 5 It is a schematic diagram of the hydraulic cylinder barrel processing method with a mounting structure at the cylinder mouth portion provided by the present invention and the cylinder barrel processing stop state in the processing tooling.

[0020] Figure 6 This is a schematic diagram of the assembly structure of a hydraulic cylinder barrel processing tool with a mounting structure at the cylinder mouth and a rib plate component provided by the present invention.

[0021] In the figure: 1. Cylinder; 2. Stopper; 3. Lateral support plate; 4. Bottom plate; 5. Upper cavity joint seat; 6. Longitudinal plate; 7. Cylinder end frame socket; 8. Center frame; 9. Damping tool rod; 10. Base; 11. First clamping block group; 12. Second clamping block group; 13. Arc connecting plate; 14. Third clamping block group. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0023] Example 1 This embodiment provides a hydraulic cylinder barrel processing tool with a mounting structure at the cylinder mouth, such as Figure 6 As shown, it includes a base 10, a plurality of first clamping block groups 11, a plurality of second clamping block groups 12, and a plurality of third clamping block groups 14.

[0024] The first clamping block groups 11 are arranged around the base 10 to clamp and position the lateral support plates 3. The second clamping block groups 12 are provided on the longitudinal sides of the base 10 to clamp and position the longitudinal plates 6. The third clamping block groups 14 are provided on the lateral sides of the base 10 to clamp and position the arcuate connecting plates 13.

[0025] Several of the first clamping block groups 11, several of the second clamping block groups 12, and several of the third clamping block groups 14 surround the lateral support plate 3, the longitudinal plate 6 and the arc-shaped connecting plate 13 for splicing and positioning, so that the lateral support plate 3, the longitudinal plate 6 and the arc-shaped connecting plate 13 are welded into the frame.

[0026] Specifically, the plurality of second clamping block groups and the plurality of third clamping block groups are arranged perpendicularly.

[0027] This embodiment also provides a method for processing a hydraulic cylinder with a mounting structure at the cylinder mouth. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, the specific steps include: The blanking is based on the minimum 40mm length of the frame required by the processing equipment, taking into account the 20mm protruding length compared to the finished cylinder, the interference distance between the rib plate and the equipment frame is 30, the blanking head allowance is 6mm, and the blanking length is extended by 96mm; that is, the size of the cylinder is 96mm longer than the size of the finished cylinder. Chamfer the inner holes of both ends of the angle brace in one go, align them, and flatten the left and right end surfaces by 2mm each. Process until the total length of the finished cylinder is plus 92mm, and chamfer both ends by 4×45°; The upper chamber is welded using the hydraulic cylinder processing tooling with a mounting structure at the cylinder mouth provided in this embodiment. The lateral support plates 3, longitudinal plates 6, and arc-shaped connecting plates 13 in the rib plate assembly are pre-welded into a frame. The frame is then positioned and welded to the cylinder 1 using the groove end of the cylinder. The bottom plate 4 is then welded to the frame, and the upper chamber joint seat 5 is welded to the cylinder. Aging treatment was performed on the cylinder with the upper cavity joint seat and rib plate assembly welded thereto to achieve the purpose of removing the cylinder stress. The aging temperature was 450°C and the holding time was 4 hours. Shot blasting: The cylinder barrel that has undergone aging treatment is shot blasted again to remove oxide scale or impurities on the cylinder barrel surface; Milling and drilling take the outer cylindrical surface of the cylinder as the reference, mill the bottom plate plane according to the drawing, ensure that the plane is located at the center of the joint hole, and mill 6-Φ22 holes according to the drawing; The inner holes at both ends of the brace are chamfered twice, the cylinder mouth end is chamfered at 4×45°, and the groove end of the cylinder is turned into a groove; The scraper roller is positioned and clamped with 45° chamfers at both ends, with the ribs facing upwards, and the inner hole of the scraper roller adjusted to the drawing size; Turn the inner holes at both ends of the stop support, flatten the cylinder end face by 2mm, to the total length of the finished cylinder plus 90mm, repair the cylinder end frame socket, use the center frame 8 to support the cylinder end frame socket 7, remove the tailstock chuck, use the damping tool rod 9 to extend the tool into the cylinder 90mm, and turn the thread and stop 2 according to the drawing; The upper cavity joint hole is drilled on the cylinder barrel with the upper cavity joint seat 5 as the reference; Cut off the cylinder barrel with the end surface of the bottom plate as the reference; The milling drill uses the outer cylindrical surface of cylinder 1 as the reference, and lengthens the cylinder to the requirements of the drawing according to the drawing, and mills the inner chamfer of the cylinder according to the drawing.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention. They should all be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for machining a hydraulic cylinder with a mounting structure at the cylinder mouth, comprising the following steps: For blanking, the length of the finished cylinder, the minimum length of the cylinder end frame required by the equipment, the length of the rib assembly extending beyond the finished cylinder, the interference distance between the rib assembly and the center frame, and the blanking head length are accumulated in sequence to obtain the blanking size of the cylinder and perform blanking. After leveling the inner holes of the two ends of the cylinder after the inverted support is cut, the left and right end surfaces of the cylinder are leveled and chamfered; Welding the upper cavity: pre-weld the lateral support plates, longitudinal plates, and arc-shaped connecting plates in the rib plate assembly into a frame, and weld the frame to the cylinder barrel with the groove end of the cylinder barrel in a positioning manner. Then, weld the bottom plate to the frame, and weld the upper cavity joint seat to the cylinder barrel. The milling drill uses the outer cylindrical surface of the cylinder as a reference to mill the positioning plane and the bottom plate fixing hole of the bottom plate; Two-level inverted support the inner holes at both ends of the cylinder, repair the cylinder end bevel of the cylinder, and machine the tail bevel; The scraper is positioned and clamped by chamfering the two ends of the cylinder, and the rib plate assembly is placed upward to scrape the inner hole of the cylinder; Turning stoppers to support the inner holes at both ends of the cylinder, leveling the end surface of the cylinder port, repairing the support sockets at the cylinder port end, using a center frame to support the support sockets at the cylinder port end, withdrawing the tailstock chuck, and turning threads and stoppers in the inner hole of the cylinder using a damping tool rod; Align the upper cavity joint hole and drill through it; The sawing is based on the end surface of the bottom plate and the extended cylinder is sawed off; The milling drill uses the outer cylindrical surface of the cylinder as the reference, mills out the end face after lengthening the cylinder, and mills the inner chamfer of the cylinder.

2. The method for machining a hydraulic cylinder with a mounting structure at the cylinder mouth according to claim 1, characterized in that: The damping tool rod is a damping tool rod with a diameter of Φ50mm and a processing aspect ratio of 20 times, so that the processing roughness of the stop is controlled within Ra1.6 and the runout is controlled within 0.06mm.

3. The method for machining a hydraulic cylinder with a mounting structure at the cylinder mouth according to claim 1, characterized in that: Between the welding rib plate assembly and joint seat step and the milling and drilling step, aging and shot blasting are also included, with an aging temperature of 400°C to 500°C, a holding time of 4h to 5h, and a surface roughness of Ra2.5µm to 5µm after shot blasting.

4. A hydraulic cylinder processing tool with a mounting structure at the cylinder mouth, characterized by: It includes a base, a plurality of first clamping block groups, a plurality of second clamping block groups, and a plurality of third clamping block groups; A plurality of first clamping block groups are arranged around the base, and are used to clamp and position the lateral support plate; A plurality of second clamping block groups are arranged on the longitudinal side of the base, for clamping and positioning the longitudinal plate; A plurality of third clamping block groups are arranged on the lateral side of the base, and are used to clamp and position the arc-shaped connecting plate; A plurality of the first clamping block groups, a plurality of the second clamping block groups, and a plurality of the third clamping block groups surround and position the lateral support plates, the longitudinal plates, and the arcuate connecting plates, so that the lateral support plates, the longitudinal plates, and the arcuate connecting plates are welded into a frame.

5. The hydraulic cylinder barrel processing tool with a mounting structure at the cylinder mouth according to claim 4 is characterized in that: The plurality of second clamping block groups and the plurality of third clamping block groups are arranged vertically.

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