Hydraulic clamping ring for machining thin-wall pipe fitting

Abstract

The utility model discloses a hydraulic snap ring for processing a thin-wall pipe fitting, which comprises a hydraulic core ring, an elastic sleeve and a thin-wall pipe fitting, and the hydraulic core ring comprises a shell, a first expansion sleeve and a second expansion sleeve; the shell is a circular ring, two grooves are formed in the inner hole wall of the shell, the groove in the upper end is a first oil cavity, the groove in the lower end is a second oil cavity, and the radian of the first oil cavity is larger than that of the second oil cavity; a first expansion sleeve is arranged at an opening of the first oil cavity, and a second expansion sleeve is arranged at an opening of the second oil cavity; the elastic sleeve is clamped in an inner hole of the hydraulic core ring, the thin-wall pipe fitting is clamped in an inner hole of the elastic sleeve, and the hydraulic core ring is installed on a chuck of a machine tool. According to the hydraulic clamping ring, the outer wall of the thin-wall pipe fitting is clamped in a hydraulic mode, the clamping area is large, the thin-wall pipe fitting is not prone to deformation in the using process, the surface of the thin-wall pipe fitting is not prone to damage, the precision of secondary clamping is high, and the hydraulic clamping ring is particularly suitable for finish machining of the thin-wall pipe fitting.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing fixtures, and in particular relates to a hydraulic clamping ring used for processing thin-wall pipe fittings. Background Art

[0002] When finishing thin-walled pipe fittings, if the thin-walled pipe fittings are clamped with traditional chucks, it is very easy to cause the workpiece to deform or the surface of the workpiece to be damaged during the clamping process, causing the shape and position tolerances of the workpiece to exceed the tolerance, and in serious cases, causing the workpiece to be scrapped.

[0003] Thin-walled pipe fittings are generally mass-produced during the finishing process. Since the outer surface of the thin-walled pipe fittings is a processed surface, the secondary clamping accuracy of the workpiece is not high during the secondary clamping. If the processing requirements of the thin-walled pipe fittings are high, manual calibration is required in the existing processing methods; however, manual calibration is time-consuming, requires a high level of technical skills from the operator, and has low production efficiency. Utility Model Content

[0004] In view of the problems existing in the background technology, the utility model provides a hydraulic clamping ring for processing thin-walled pipe fittings.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a hydraulic clamping ring for processing thin-walled pipe fittings, comprising a hydraulic core ring, an elastic sleeve and a thin-walled pipe fitting, wherein the hydraulic core ring comprises a shell, a first expansion sleeve and a second expansion sleeve; the shell is a circular ring, and two grooves are arranged on the inner hole wall of the shell, the upper end groove is a first oil chamber, and the lower end groove is a second oil chamber, and the curvature of the first oil chamber is greater than that of the second oil chamber; a first expansion sleeve is arranged at the opening of the first oil chamber, and a second expansion sleeve is arranged at the opening of the second oil chamber;

[0006] The elastic sleeve is clamped in the inner hole of the hydraulic core ring, the thin-walled pipe fitting is clamped in the inner hole of the elastic sleeve, and the hydraulic core ring is installed on the chuck of the machine tool.

[0007] The first expansion sleeve is an elastic metal plate, the first expansion sleeve is bonded to the opening of the first oil chamber, and two ends of the first expansion sleeve are fixed between the first oil chamber and the second oil chamber by fixing screws.

[0008] The second expansion sleeve is an elastic metal plate, the second expansion sleeve is bonded to the opening of the second oil chamber, and the two ends of the second expansion sleeve are fixed between the first oil chamber and the second oil chamber by fixing screws.

[0009] A first pressurizing device and a second pressurizing device with the same structure are arranged on the outer wall of the hydraulic core ring; the first pressurizing device is connected to the first oil chamber, and the second pressurizing device is connected to the second oil chamber.

[0010] The first pressurizing device comprises a pressurizing screw and a hydraulic cylinder, the cylinder barrel of the hydraulic cylinder is connected to the first oil chamber, and the pressurizing screw controls the movement of the piston of the hydraulic cylinder.

[0011] The elastic sleeve is a circular ring, the length of the elastic sleeve is adapted to the length of the hydraulic core ring, the outer diameter of the elastic sleeve is clearance matched with the inner hole of the hydraulic core ring, and the inner hole of the elastic sleeve is clearance matched with the outer diameter of the thin-walled pipe fitting; a plurality of elastic expansion joints are staggered on the outer wall of the elastic sleeve, and a positioning boss is provided on one side of the outer circle of the elastic sleeve.

[0012] The beneficial effects of the utility model: the utility model provides a hydraulic clamping ring for processing thin-walled pipe fittings. The hydraulic clamping ring clamps the outer wall of the thin-walled pipe fittings by hydraulic means, has a large clamping area, and the thin-walled pipe fittings are not easily deformed during use, the surface of the thin-walled pipe fittings are not easily damaged, and the secondary clamping accuracy is high. The utility model is particularly suitable for the fine processing of thin-walled pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the utility model.

[0014] Figure 2 It is a side half-section view of the utility model.

[0015] Figure 3 This is the front view of the hydraulic core ring.

[0016] Figure 4 A side view of the hydraulic core ring.

[0017] Figure 5 It is a side cross-sectional view of the hydraulic core ring.

[0018] Figure 6 This is the AA cross-section view.

[0019] Figure 7 This is an enlarged view of the B direction.

[0020] Figure 8 It is the front view of the elastic sleeve.

[0021] Fig. 9 A side view of the elastic sleeve.

[0022] Fig.10 It is a side cross-sectional view of the elastic sleeve.

[0023] Fig.11 It is a cross-sectional view of the first pressurizing device.

[0024] In the figure: 1. hydraulic core ring, 11. first oil chamber, 12. first pressurizing device, 121. pressurizing screw, 122. hydraulic cylinder, 13. second oil chamber, 14. second pressurizing device, 15. first expansion sleeve, 16. second expansion sleeve, 17. fixing screw, 18. housing, 2. elastic sleeve, 21. elastic expansion joint, 22. positioning boss, 3. thin-walled pipe fitting, 4. chuck. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the specification. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] The following is a further detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings: A hydraulic clamping ring for processing thin-walled pipe fittings, comprising a hydraulic core ring 1, an elastic sleeve 2 and a thin-walled pipe fitting 3, wherein the hydraulic core ring 1 comprises a shell 18, a first expansion sleeve 15 and a second expansion sleeve 16; the shell 18 is a circular ring, and two grooves are provided on the inner hole wall of the shell 18, the upper end groove is a first oil chamber 11, and the lower end groove is a second oil chamber 13, the curvature of the first oil chamber 11 is greater than the curvature of the second oil chamber 13, and in this embodiment, the first oil chamber 11 is a first oil chamber 13. The curvature ratio of the first oil chamber 11 to the second oil chamber 13 is about 2:1; a first expansion sleeve 15 is provided at the opening of the first oil chamber 11, and a second expansion sleeve 16 is provided at the opening of the second oil chamber 13; the first expansion sleeve 15 is an elastic metal plate, the first expansion sleeve 15 is bonded to the opening of the first oil chamber 11, and the two ends of the first expansion sleeve 15 are fixed between the first oil chamber 11 and the second oil chamber 13 by fixing screws 17; the second expansion sleeve 16 is an elastic metal plate, the second expansion sleeve 16 is bonded to the opening of the second oil chamber 13, and the second expansion sleeve The two ends of 16 are fixed between the first oil chamber 11 and the second oil chamber 13 by fixing screws 17; in the actual application process, in order to prevent the hydraulic clamping ring from being damaged by excessive oil pressure, the hydraulic clamping ring is provided with fixing screws 17 for fixing the expansion sleeve and preventing the expansion sleeve from shifting; in the process of use, it can be changed according to the actual situation, for example, fixing screws 17 are installed all around the expansion sleeve to make the expansion sleeve more stable; the outer wall of the hydraulic core ring 1 is provided with a first pressurizing device 12 and a second pressurizing device 14 of the same structure; the first pressurizing device 12 is connected to the first oil chamber 11, and the second pressurizing device 14 is connected to the second oil chamber 13; the first pressurizing device 12 includes a pressurizing screw 121 and a hydraulic cylinder 122, the cylinder barrel of the hydraulic cylinder 122 is connected to the first oil chamber 11, and the pressurizing screw 121 controls the movement of the piston of the hydraulic cylinder 122; the function of the pressurizing device is to adjust the oil pressure in the oil chamber, and the purpose of controlling the deformation of the expansion sleeve is achieved by adjusting the oil pressure; the hydraulic core ring 1 is installed on the chuck 4 of the machine tool;

[0027] The elastic sleeve 2 is clamped in the inner hole of the hydraulic core ring 1, and the thin-walled pipe fitting 3 is clamped in the inner hole of the elastic sleeve 2. The elastic sleeve 2 is a circular ring, the length of the elastic sleeve 2 is adapted to the length of the hydraulic core ring 1, the outer diameter of the elastic sleeve 2 is clearance-matched with the inner hole of the hydraulic core ring 1, and the inner hole of the elastic sleeve 2 is clearance-matched with the outer diameter of the thin-walled pipe fitting 3; in actual use, the gap between the elastic sleeve 2 and the hydraulic core ring 1 is less than or equal to 0.05mm, and the gap between the elastic sleeve 2 and the thin-walled pipe fitting 3 is less than or equal to 0.05mm, so as to facilitate installation; a plurality of elastic expansion joints 21 are staggered on the outer wall of the elastic sleeve 2, and a positioning boss 22 is provided on one side of the outer circle of the elastic sleeve 2; the function of the elastic sleeve 2 is to maintain concentricity during the process of force deformation, thereby reducing the error of secondary clamping; the positioning boss 22 is clamped on the side wall of the hydraulic core ring 1 to prevent the elastic sleeve 2 from falling off.

[0028] In this embodiment, the gap between the elastic sleeve 2 and the hydraulic core ring 1 is less than or equal to 0.05mm, and the gap between the elastic sleeve 2 and the thin-walled pipe fitting 3 is less than or equal to 0.05mm; the controllable deformation of the first expansion sleeve 15 and the second expansion sleeve 16 is 0-0.2mm; through calculation, it can be known that at this time, the tolerance range of the thin-walled pipe fitting 3 that can be clamped in the elastic sleeve 2 is 0-0.1mm; when the outer diameter of the thin-walled pipe fitting 3 exceeds the tolerance processing range, it is necessary to replace the elastic sleeve 2 with a different inner hole to adapt to the thin-walled pipe fitting 3 with different outer diameters; so in the process of use, this hydraulic clamp is suitable for processing and clamping thin-walled pipe fittings 3 with a small outer diameter tolerance range.

[0029] The use process of the utility model is as follows: first, install the elastic sleeve 2 in the hydraulic core ring 1, and install the hydraulic core ring 1 on the chuck 4 of the machine tool; then use standard parts for calibration to make the shape and position tolerances meet the processing requirements; during the calibration process, the first pressurizing device 12 and the second pressurizing device 14 can be used for adjustment; after the calibration is completed, the pressurizing screw of the second pressurizing device 14 is locked; then, the pressurizing screw of the first pressurizing device 12 is opened, the calibration part is removed, and the thin-walled pipe fitting 3 to be processed is installed in the inner hole of the elastic sleeve 2, and the pressurizing screw of the first pressurizing device 12 is tightened to lock it, and then the processing is carried out after locking; after the processing is completed, the pressurizing screw of the first pressurizing device 12 is opened, the processed thin-walled pipe fitting 3 is removed, and the unprocessed thin-walled pipe fitting 3 is reinstalled; repeat the above steps to achieve continuous processing.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0031] The parts not described in detail in this utility model are prior art.

Claims

1. A hydraulic clamping ring for processing thin-walled pipe fittings, comprising a hydraulic core ring (1), an elastic sleeve (2) and a thin-walled pipe fitting (3), wherein: The hydraulic core ring (1) comprises a housing (18), a first expansion sleeve (15) and a second expansion sleeve (16); the housing (18) is a circular ring, and two grooves are provided on the inner hole wall of the housing (18); the upper groove is the first oil chamber (11), and the lower groove is the second oil chamber (13); the curvature of the first oil chamber (11) is greater than the curvature of the second oil chamber (13); the first expansion sleeve (15) is provided at the opening of the first oil chamber (11), and the second expansion sleeve (16) is provided at the opening of the second oil chamber (13); The elastic sleeve (2) is clamped in the inner hole of the hydraulic core ring (1), the thin-walled pipe fitting (3) is clamped in the inner hole of the elastic sleeve (2), and the hydraulic core ring (1) is mounted on a chuck (4) of a machine tool.

2. A hydraulic clamping ring for processing thin-walled pipe fittings according to claim 1, characterized in that: The first expansion sleeve (15) is an elastic metal plate. The first expansion sleeve (15) is bonded to the opening of the first oil chamber (11). Two ends of the first expansion sleeve (15) are fixed between the first oil chamber (11) and the second oil chamber (13) by fixing screws (17).

3. A hydraulic clamping ring for processing thin-walled pipes according to claim 1, characterized in that: The second expansion sleeve (16) is an elastic metal plate. The second expansion sleeve (16) is bonded to the opening of the second oil chamber (13). Both ends of the second expansion sleeve (16) are fixed between the first oil chamber (11) and the second oil chamber (13) by fixing screws (17).

4. A hydraulic clamping ring for processing thin-walled pipes according to claim 1, characterized in that: A first pressurizing device (12) and a second pressurizing device (14) having the same structure are provided on the outer wall of the hydraulic core ring (1); the first pressurizing device (12) is connected to the first oil chamber (11), and the second pressurizing device (14) is connected to the second oil chamber (13).

5. A hydraulic clamping ring for processing thin-walled pipes according to claim 4, characterized in that: The first pressurizing device (12) comprises a pressurizing screw (121) and a hydraulic cylinder (122); the cylinder barrel of the hydraulic cylinder (122) is connected to the first oil chamber (11); and the pressurizing screw (121) controls the movement of the piston of the hydraulic cylinder (122).

6. A hydraulic clamping ring for processing thin-walled pipe fittings according to claim 1, characterized in that: The elastic sleeve (2) is a circular ring, the length of the elastic sleeve (2) matches the length of the hydraulic core ring (1), the outer diameter of the elastic sleeve (2) and the inner hole of the hydraulic core ring (1) are clearance matched, and the inner hole of the elastic sleeve (2) and the outer diameter of the thin-walled pipe (3) are clearance matched; a plurality of elastic expansion joints (21) are staggeredly arranged on the outer wall of the elastic sleeve (2), and a positioning boss (22) is provided on one side of the outer circle of the elastic sleeve (2).

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