Thin-walled tube assembling and cold expanding device and using method thereof

Abstract

The invention discloses a thin-walled tube assembly cold expanding device and a using method thereof.The device comprises a fixing part and a cold expanding tool, the fixing part is placed on a workbench and fixes a thin-walled tube, and the thin-walled tube is flared through the cold expanding tool. The invention aims to provide cold expanding equipment for thin-walled tubes, which is low in cost, convenient and simple to operate and capable of meeting the requirements of parts and assembly parts, in particular to a cold expanding device for special-shaped complex assembly thin-walled tubes. Through the device, the precision requirement of thin-walled tube assembly can be met, the device is also suitable for flaring in various environments, and the defects of wrinkles, deformation and the like of a flaring part can be reduced. The device is simple in structure, low in production cost, simple in operation method and high in quality of processed products. And the device has the advantages of safety in use, high loading and unloading speed and high production efficiency. Compared with a traditional flaring method, the device can be assembled and disassembled only by screwing or unscrewing a screw and expanding the inner sleeve, and the assembling and disassembling speed and the production efficiency are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a thin-walled pipe assembly cold expansion device and a use method thereof. Background Art

[0002] Thin-walled tubes are important parts widely used in various industrial fields, and they are used in the fields of petroleum, chemical industry, navigation, aviation, and nuclear industry. They have functions such as conveying fluids, transmitting pressure, and exhaust ventilation. Especially in the nuclear power industry, thin-walled elbows that play a connecting role play a very important role. When the machine is running, the thin-walled tubes are under pressure, and the requirements for the sealing, pressure bearing capacity, corrosion resistance, and fatigue strength of the thin-walled tube joints are more stringent. Therefore, in the fields of petroleum, chemical industry, navigation, aviation, and nuclear industry, thin-walled tubes that play a connecting role are often required to be made of high-strength materials, and the precision requirements of the parts after the expansion are very high to ensure that they can accurately and controllably meet the expected functional requirements.

[0003] However, the cold expansion of thin-walled tubes has always been a difficult problem in the industry. Currently, conventional expansion equipment is relatively heavy and only supports the expansion of parts and simple assembly of thin-walled tubes. If it is the assembly expansion of complex parts, conventional expansion equipment cannot be used.

[0004] In addition, when conventional expanding equipment is used to process thin-walled tubes, the thin-walled tubes need to be fixed and the thin-walled tube mouths need to be stamped and formed with a mold. The accuracy requirements of the expanding part cannot be guaranteed, and the tubes are at risk of deformation during stamping. Moreover, if the thin-walled tubes and parts need to be assembled and expanded, and there is a relative positional relationship, the existing ordinary expanding equipment will cause defects such as bruises on the assembly parts. Usually, special expanding equipment needs to be customized for the assembly parts to complete the processing. The cost of special cold expansion equipment is high and its applicability is limited. In addition, since the thin-walled tubes will inevitably have problems such as deformation and cracking during the cold expansion process, the customization of special equipment cannot fully guarantee their accuracy.

[0005] The patent document with the announcement number CN103962466A discloses a method and device for expanding thin-walled pipes. The device for expanding thin-walled pipes includes: a main shaft; a secondary shaft connected to the main shaft; a spinning head with a tapered outer surface connected to the secondary shaft; a fixture for clamping the pipe to be processed, arranged below the spinning head; a movable top core, arranged below the spinning head; the axes of the fixture and the movable top core are located in a straight line with the axis of the main shaft; the movable top core includes: a support rod, a top core head arranged at the end of the support rod and supporting the inner wall of the pipe to be processed, and an elastic device for pressing the top core head against the spinning head. The method for expanding thin-walled pipes includes: using a spinning head, rotating into and pressing down to the expanded end of the pipe to be processed, and using the axial elastic force of the elastic device on the spinning head, so that the top surface of the top core is always pressed against the spinning head during the dynamic process of the spinning head rotating into and pressing down to the expanded end of the pipe to be processed.

[0006] This patent uses external power to drive the spinning head to rotate for expansion, and the spinning head is tilted to set an angle to limit the expansion angle. In this application, no external power is required for expansion, and only manpower is required to complete the expansion operation. Manpower can better control the force exerted on the thin-walled tube to avoid excessive expansion. At the same time, the expansion component, the casing handle and the expansion sleeve in this application are coaxially arranged to ensure the uniformity of expansion. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a thin-walled tube assembly cold expansion device and a use method thereof.

[0008] The present invention is achieved through the following technical solutions.

[0009] The invention provides a thin-walled tube assembly cold expansion device, comprising a fixing part and a cold expansion tool. The fixing part is placed on a workbench and fixes the thin-walled tube, and the cold expansion tool is used to expand the thin-walled tube.

[0010] Preferably, the fixing part includes a main body and a clamping part, both ends of the main body are respectively connected to the clamping parts, a fixing plate A is arranged on the main body, a fixing plate B is arranged on the clamping part, a plurality of through holes A are respectively arranged on the fixing plate A and the fixing plate B, the thin-walled tube passes through the through holes A and passes through the fixing plates A and B and is connected, and a bell mouth is arranged on one side of the through hole A.

[0011] Preferably, the cold expansion tool includes an expansion sleeve, a sleeve wrench, a wrench and a flaring assembly. A connecting portion A is provided on the small end of the expansion sleeve, the expansion sleeve is connected to one end of the sleeve wrench through the connecting portion A, the large end of the expansion sleeve is connected to the flaring assembly through a connecting groove A, an internal thread is provided in the connecting groove A, and the other end of the sleeve wrench passes through the wrench for connection.

[0012] Preferably, the expansion assembly includes an expansion inner sleeve, a working sleeve, a tapered sleeve, a screw and a positioning sleeve. The expansion inner sleeve is placed in the connecting groove A for connection. One end of the screw passes through the tapered sleeve, the working sleeve and the expansion inner sleeve in sequence and then extends into the connecting groove A and is threadedly connected to the internal thread. The other end of the screw is connected to the positioning sleeve. The screw is connected to the working sleeve through the tapered sleeve, and one end of the working sleeve is connected to the expansion sleeve.

[0013] Preferably, the connecting portion A is hexagonal, and a connecting groove B is provided at one end of the sleeve wrench, and the connecting groove B is hexagonal.

[0014] Preferably, the expansion inner sleeve is in a truncated cone shape, a tapered thread is arranged on the outer wall of the expansion inner sleeve, the small end of the expansion inner sleeve is close to one side of the expansion sleeve, a through hole B is arranged on the expansion inner sleeve, and the through hole B is hexagonal.

[0015] Preferably, the working sleeve is in the shape of a hollow truncated cone, and the small end of the working sleeve is close to the side of the expansion sleeve.

[0016] Preferably, the cone sleeve is in the shape of a hollow truncated cone, the small end of the cone sleeve is close to the side of the expansion sleeve, and a through hole C is arranged on the cone sleeve, and the through hole C is a stepped hole.

[0017] Preferably, the diameter of the positioning sleeve is greater than the diameter of the expansion sleeve, and the positioning sleeve is made of stainless steel.

[0018] A method for using a thin-walled pipe assembly cold expansion device comprises the following steps:

[0019] S1: Place the fixture on the workbench and fix the thin-walled tube through the through holes A of the fixing plate A and the fixing plate B in sequence.

[0020] S2: Screw the expansion sleeve into the inner thread of the connection groove A through the tapered thread, then insert the large end of the expansion sleeve into the thin-walled tube toward the side to be expanded, and then insert the positioning sleeve into the end of the thin-walled tube to be expanded.

[0021] S3: Hold the sleeve wrench from the other end of the thin-walled tube and insert it into the connection part A, then push the expansion sleeve until the large end contacts the small end of the positioning sleeve. Hold the sleeve wrench in place by pressing against the wrench, remove the positioning sleeve, and push the hexagonal through hole B of the expansion sleeve to tighten it with the expansion sleeve thread.

[0022] S4: Install the working sleeve, cone sleeve and screws. After the screws are inserted into the connection groove A and penetrate the expansion sleeve, they are connected and tightened with the internal thread of the connection groove A. By tightening the screws, the expansion of the thin-walled tube is completed under the action of the working sleeve and cone sleeve.

[0023] S5: After completing the expansion of the thin-walled tube, separate the screw from the expansion sleeve, take out the working sleeve and the cone sleeve, loosen the expansion inner sleeve, use the sleeve wrench to push the expansion sleeve out of the thin-walled tube, take out the sleeve wrench and remove the thin-walled tube from the fixing piece.

[0024] The beneficial effects of the present invention are:

[0025] The purpose of the present invention is to provide a cold expansion device for thin-walled tubes with low cost, simple and convenient operation, and meeting the requirements of parts and assemblies, especially to provide a cold expansion device for thin-walled tubes with complex and irregular shaped assemblies. The device can meet the precision requirements of thin-walled tube assembly, is also suitable for expansion in a variety of environments, and can also reduce defects such as wrinkles and deformation in the expanded part. The device of the present invention has a simple structure, low production cost, and a simple operation method, and the processed product is of high quality. It is also safe to use, fast loading and unloading speed, and high production efficiency. Compared with traditional expansion methods, the device of the present invention only needs to tighten or loosen the screws and expand the inner sleeve for loading and unloading, which greatly improves the loading and unloading speed and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the cold expansion tool of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the cold expansion tool of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the expansion assembly of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the expansion sleeve of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the casing wrench of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the expansion inner sleeve of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the working set of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the cone sleeve of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of the screw of the present invention;

[0035] Fig.10 It is a schematic structural diagram of the fixing member of the present invention;

[0036] Fig.11 It is a partial structural schematic diagram of the fixing member of the present invention;

[0037] Fig.12 It is a partial structural schematic diagram of the fixing member of the present invention;

[0038] Fig.13 It is a structural schematic diagram of the clamping member of the present invention;

[0039] Fig.14 It is a schematic diagram of the structure of the thin-walled tube after expansion of the present invention;

[0040] In the figure: 1-thin-walled tube, 2-main body, 21-fixed plate A, 3-clamping piece, 31-fixed plate B, 4-through hole A, 41-bell mouth, 5-expansion sleeve, 51-small end, 52-large end, 53-connecting part A, 54-connecting groove A, 6-sleeve handle, 61-connecting groove B, 7-handle, 8-expansion inner sleeve, 81-through hole B, 9-working sleeve, 10-cone sleeve, 101-through hole C, 11-screw, 12-positioning sleeve. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0042] Example:

[0043] like Figures 1 to 14 As shown, a thin-walled tube assembly cold expansion device includes a fixing part and a cold expansion tool. The fixing part is placed on a workbench and fixes the thin-walled tube 1. The thin-walled tube 1 is expanded by the cold expansion tool.

[0044] The fixing member includes a main body 2 and a clamping member 3, both ends of the main body 2 are respectively connected to the clamping member 3, a fixing plate A21 is arranged on the main body 2, a fixing plate B31 is arranged on the clamping member 3, a plurality of through holes A4 are respectively arranged on the fixing plate A21 and the fixing plate B31, the thin-walled tube 1 passes through the through holes A4 and penetrates the fixing plate A21 and the fixing plate B31 and is connected, a bell mouth 41 is arranged on one side of the through hole A4, so as to fit the wall of the thin-walled tube 1 when the thin-walled tube 1 is expanded.

[0045] The cold expansion tool includes an expansion sleeve 5, a sleeve wrench 6, a wrench 7 and a flaring assembly. A connecting portion A53 is provided on the small end 51 of the expansion sleeve 5. The expansion sleeve 5 is connected to one end of the sleeve wrench 6 through the connecting portion A53. The large end 52 of the expansion sleeve 5 is threadedly connected to the flaring assembly through a connecting groove A54. An internal thread is provided in the connecting groove A54. The other end of the sleeve wrench 6 passes through the wrench 7 and is welded and connected. The sleeve wrench 6 and the wrench 7 are vertically arranged, so that the sleeve wrench 6 can be controlled by exerting force on the wrench 7.

[0046] The flaring assembly includes an expansion inner sleeve 8, a working sleeve 9, a tapered sleeve 10, a screw 11 and a positioning sleeve 12. The expansion inner sleeve 8 is placed in the connecting groove A54 for connection. One end of the screw 11 passes through the tapered sleeve 10, the working sleeve 9, and the expansion inner sleeve 8 in sequence and then extends into the connecting groove A54 to be threadedly connected with the internal thread. The other end of the screw 11 is connected to the positioning sleeve 12. The screw 11 is a hexagon socket head screw. The screw 11 is connected to the working sleeve 9 through the tapered sleeve 10, and one end of the working sleeve 9 is connected to the expansion sleeve 5.

[0047] The connecting portion A53 is hexagonal in shape, and a connecting groove B61 is provided at one end of the sleeve wrench 6, and the connecting groove B61 is hexagonal in shape.

[0048] The expansion inner sleeve 8 is in a truncated cone shape, and a tapered thread is arranged on the outer wall of the expansion inner sleeve 8. The small end of the expansion inner sleeve 8 is close to the side of the expansion sleeve 5. A through hole B81 is arranged on the expansion inner sleeve 8, and the through hole B81 is in a hexagonal shape.

[0049] The working sleeve 9 is in the shape of a hollow truncated cone, and the small end of the working sleeve 9 is close to the side of the expansion sleeve 5.

[0050] The cone sleeve 10 is in a hollow truncated cone shape, with the small end of the cone sleeve 10 close to the expansion sleeve 5 . A through hole C101 is provided on the cone sleeve 10 . The through hole C101 is a stepped hole for limiting the screw 11 .

[0051] The diameter of the positioning sleeve 12 is greater than the diameter of the expansion sleeve 5 , and the positioning sleeve 12 is made of stainless steel.

[0052] A method for using a thin-walled pipe assembly cold expansion device comprises the following steps:

[0053] S1: Place the fixture on the workbench and fix the thin-walled tube 1 through the through holes A4 of the fixing plate A21 and the fixing plate B31 in sequence.

[0054] S2: Screw the expansion sleeve 8 into the internal thread of the connection groove A54 through the tapered thread, then insert the large end 52 of the expansion sleeve 5 into the thin-walled tube 1 toward the side of the thin-walled tube 1 to be expanded, and then insert the positioning sleeve 12 into the end of the thin-walled tube 1 to be expanded.

[0055] S3: Hold the sleeve wrench 6 from the other end of the thin-walled tube 1 and insert it into the connecting part A53, then push the expansion sleeve 5 until the large end 52 contacts the small end surface of the positioning sleeve 12, hold the sleeve wrench 6 in place by pressing against the wrench 7, remove the positioning sleeve 12, push the hexagonal through hole B81 of the expansion inner sleeve 8 and tighten it with the expansion sleeve 5 thread,

[0056] S4: Install the working sleeve 9, the cone sleeve 10 and the screw 11. The screw 11 extends into the connection groove A54 and penetrates the expansion inner sleeve 8, and is connected and fastened with the internal thread of the connection groove A54. By tightening the screw 11, the expansion of the thin-walled tube 1 is completed under the action of the working sleeve 9 and the cone sleeve 10.

[0057] S5: After completing the expansion of the thin-walled tube 1, separate the screw 11 from the expansion sleeve 5, take out the working sleeve 9 and the cone sleeve 10, and after loosening the expansion inner sleeve 8, use the sleeve wrench 6 to push the expansion sleeve 5 out of the thin-walled tube 1, and after taking out the sleeve wrench 6, remove the thin-walled tube 1 from the fixing piece.

Claims

1. A thin-walled tube assembly cold expansion device, characterized in that: It comprises a fixing part and a cold expansion tool, wherein the fixing part is placed on a workbench and fixes a thin-walled tube (1), and the cold expansion tool is used to expand the thin-walled tube (1).

2. A thin-walled tube assembly cold expansion device as claimed in claim 1, characterized in that: The fixing member comprises a main body (2) and a clamping member (3), both ends of the main body (2) are respectively connected to the clamping member (3), a fixing plate A (21) is arranged on the main body (2), a fixing plate B (31) is arranged on the clamping member (3), the fixing plate A (21) and the fixing plate B (31) are respectively provided with a plurality of through holes A (4), the thin-walled tube (1) passes through the fixing plate A (21) and the fixing plate B (31) through the through holes A (4) and is connected, and a bell mouth (41) is arranged on one side of the through holes A (4).

3. A thin-walled tube assembly cold expansion device as claimed in claim 1, characterized in that: The cold expansion tool comprises an expansion sleeve (5), a sleeve wrench (6), a wrench (7) and a flaring assembly. A connecting portion A (53) is arranged on the small end (51) of the expansion sleeve (5). The expansion sleeve (5) is connected to one end of the sleeve wrench (6) via the connecting portion A (53). The large end (52) of the expansion sleeve (5) is connected to the flaring assembly via a connecting groove A (54). An internal thread is arranged in the connecting groove A (54). The other end of the sleeve wrench (6) passes through the wrench (7) and is connected.

4. A thin-walled tube assembly cold expansion device as claimed in claim 3, characterized in that: The expansion assembly comprises an expansion inner sleeve (8), a working sleeve (9), a cone sleeve (10), a screw (11) and a positioning sleeve (12); the expansion inner sleeve (8) is placed in a connecting groove A (54) for connection; one end of the screw (11) passes through the cone sleeve (10), the working sleeve (9) and the expansion inner sleeve (8) in sequence and then extends into the connecting groove A (54) to be threadedly connected with the internal thread; the other end of the screw (11) is connected with the positioning sleeve (12); the screw (11) is connected with the working sleeve (9) through the cone sleeve (10); and one end of the working sleeve (9) is connected with the expansion sleeve (5).

5. A thin-walled tube assembly cold expansion device as claimed in claim 3, characterized in that: The connecting portion A (53) is hexagonal in shape, and a connecting groove B (61) is provided at one end of the sleeve wrench (6), and the connecting groove B (61) is hexagonal in shape.

6. A thin-walled tube assembly cold expansion device as claimed in claim 4, characterized in that: The expansion inner sleeve (8) is in a truncated cone shape, the outer wall of the expansion inner sleeve (8) is provided with a tapered thread, the small end of the expansion inner sleeve (8) is close to the side of the expansion sleeve (5), and a through hole B (81) is provided on the expansion inner sleeve (8), and the through hole B (81) is in a hexagonal shape.

7. A thin-walled tube assembly cold expansion device as claimed in claim 4, characterized in that: The working sleeve (9) is in the shape of a hollow truncated cone, and the small end of the working sleeve (9) is close to the side of the expansion sleeve (5).

8. A thin-walled tube assembly cold expansion device as claimed in claim 4, characterized in that: The cone sleeve (10) is in the shape of a hollow truncated cone, the small end of the cone sleeve (10) is close to the side of the expansion sleeve (5), and a through hole C (101) is provided on the cone sleeve (10), and the through hole C (101) is a stepped hole.

9. A thin-walled tube assembly cold expansion device as claimed in claim 4, characterized in that: The diameter of the positioning sleeve (12) is greater than the diameter of the expansion sleeve (5), and the positioning sleeve (12) is made of stainless steel.

10. A method for using the thin-walled tube assembly cold expansion device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: placing the fixing member on a workbench, and passing the thin-walled tube (1) through the through holes A (4) of the fixing plate A (21) and the fixing plate B (31) in sequence for fixing; S2: Screw the expansion sleeve (8) into the internal thread of the connection groove A (54) through the tapered thread to connect, then insert the large end (52) of the expansion sleeve (5) into the thin-walled tube (1) with the side to be expanded, and then insert the positioning sleeve (12) into the end to be expanded of the thin-walled tube (1); S3: Hold the sleeve wrench (6) from the other end of the thin-walled tube (1) and insert it into the connecting portion A (53), then push the expansion sleeve (5) until the large end (52) contacts the small end surface of the positioning sleeve (12), hold the sleeve wrench (6) in place by pressing against the wrench (7), remove the positioning sleeve (12), and push the hexagonal through hole B (81) of the expansion inner sleeve (8) to tighten it with the expansion sleeve (5) by threading; S4: The working sleeve (9), the tapered sleeve (10) and the screw (11) are assembled, the screw (11) is inserted into the connection groove A (54) and penetrates the expansion inner sleeve (8), and is then threadedly connected and fastened with the internal thread of the connection groove A (54), and the expansion of the thin-walled tube (1) is completed under the action of the working sleeve (9) and the tapered sleeve (10) by tightening the screw (11); S5: After the expansion of the thin-walled tube (1) is completed, the screw (11) is separated from the expansion sleeve (5), and the working sleeve (9) and the cone sleeve (10) are removed. After loosening the expansion inner sleeve (8), the expansion sleeve (5) is pushed out of the thin-walled tube (1) using the sleeve wrench (6). After removing the sleeve wrench (6), the thin-walled tube (1) can be removed from the fixing member.

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