Oil pipe mandrel

Abstract

The utility model discloses an oil pipe core mold which comprises a core mold body and a thickening sleeve, and the thickening sleeve is detachably connected with the core mold body. From left to right, the core mold body comprises a thickening sleeve connecting section, an extrusion section and a guide section which are connected in sequence, and the diameters of the thickening sleeve connecting section, the extrusion section and the guide section are reduced in sequence. The thickening sleeve connecting section and the extrusion section are sleeved with the thickening sleeve, and the thickening sleeve is connected with the corresponding thickening sleeve connecting section and the extrusion section in a matched mode. According to the oil pipe core mold, the core mold can be rapidly modified through the thickening sleeve, the overall production efficiency is improved, and the oil pipe core mold is simple in structure and convenient to operate.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to an oil pipe core mold. Background Technology

[0002] Thickening of oil pipes involves heating the ends of the oil pipes at high frequency and then extruding them under the action of a mold to shorten their length and increase their wall thickness. The purpose is to improve the strength of the oil pipe joints.

[0003] The pipe end thickening mold mainly consists of the existing core mold 3, forming mold 4, and clamping mold 5, such as Figure 1 As shown in the image. The process of thickening tubing 6 can be referenced. Figure 2 As shown, the oil pipe 6 is placed in the clamping mold 5 and the forming mold 4, and then the core mold 3 is inserted into the forming mold 4. The heated end of the oil pipe is squeezed by the core mold 3, and the oil pipe 6 is finally thickened into the desired product in the forming mold 4.

[0004] The above-mentioned mold manufacturing process is as follows: round steel - forging billet - rough machining - heat treatment - finish machining to finished product, and the whole cycle is generally about two months.

[0005] When a mold is urgently needed, a modification method can be used to change a large-sized mold to a smaller one (the clamping mold generally remains unchanged, the outer circle of the core mold can be machined smaller, and the inner hole of the forming mold can be machined larger). This way, the urgently needed mold can be processed in the shortest possible time.

[0006] However, if it is necessary to enlarge the outer diameter of the core mold, there is currently no good solution other than processing a new part. The long cycle of processing a new mold leads to a significant reduction in subsequent production efficiency. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide an oil pipe core mold that can realize rapid core mold modification, improve overall production efficiency, and has a simple structure and is easy to operate.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A tubing mandrel includes a mandrel body and a thickened sleeve, the thickened sleeve being detachably connected to the mandrel body; from left to right, the mandrel body includes a thickened sleeve connecting section, an extrusion section, and a guide section connected in sequence, the diameters of the thickened sleeve connecting section, the extrusion section, and the guide section decreasing sequentially; the thickened sleeve is fitted onto the thickened sleeve connecting section and the extrusion section, and is adapted and connected to the corresponding thickened sleeve connecting section and the extrusion section respectively.

[0010] Furthermore, the right end face of the thickened sleeve is flush with the right end face of the extrusion section.

[0011] Furthermore, the thickened sleeve and the thickened sleeve connecting section are connected together by threads.

[0012] Furthermore, the outer circumferential surface of the thickened sleeve connecting section is provided with an external thread; the thickened sleeve has a through inner hole, the inner hole including a threaded section and a smooth hole section; when the thickened sleeve is installed on the core mold body, the threaded section is adapted to the external thread, and the smooth hole section is located outside the extrusion section.

[0013] Furthermore, the inner hole also includes a threaded relief groove, which is located between the threaded section and the smooth hole section; from left to right, the threaded section, the threaded relief groove, and the smooth hole section are connected in sequence.

[0014] Furthermore, the right end face of the threaded relief groove abuts against the right end face of the thickened sleeve connecting section.

[0015] Furthermore, the outer surface of the thickened sleeve is provided with a wrench hole.

[0016] Furthermore, a device connection section is also provided at the left end of the thickened sleeve connection section.

[0017] Furthermore, the equipment connecting section, the thickened sleeve connecting section, the extrusion section, and the guide section are an integral structure.

[0018] The beneficial effects of this utility model after adopting the above technology are:

[0019] This utility model's tubing mandrel includes a mandrel body and a thickened sleeve, which are detachably connected to the mandrel body. From left to right, the mandrel body includes a thickened sleeve connecting section, an extrusion section, and a guide section connected sequentially, with the diameters of the thickened sleeve connecting section, extrusion section, and guide section decreasing sequentially. The thickened sleeve is fitted onto the thickened sleeve connecting section and the extrusion section, and is adapted and connected to the corresponding thickened sleeve connecting section and extrusion section respectively. This utility model's tubing mandrel utilizes the thickened sleeve to achieve rapid mandrel modification, improves overall production efficiency, and has a simple structure that is easy to operate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the oil pipe and the mold before thickening the oil pipe in the existing technology;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the oil pipe and mold after the oil pipe is thickened;

[0022] Figure 3 This is a schematic diagram of the core mold of this utility model;

[0023] Figure 4 yes Figure 3Enlarged structural schematic diagram of the thickened sleeve;

[0024] Figure 5 yes Figure 3 Enlarged structural schematic diagram of the core mold body;

[0025] In the diagram: 1. Core mold body; 10. Equipment connection section; 11. Thickened sleeve connection section; 12. Extrusion section; 13. Guide section; 2. Thickened sleeve; 200. Threaded section; 201. Threaded relief groove; 202. Smooth hole section; 21. Wrench hole; 3. Existing core mold; 4. Forming mold; 5. Clamping mold; 6. Oil pipe. Detailed Implementation

[0026] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of this utility model, but it is not intended to limit the scope of protection of the appended claims of this utility model.

[0027] like Figure 3 , Figure 4 as well as Figure 5 As shown in the figure, a tubing core mold includes a core mold body 1 and a thickened sleeve 2, which are detachably connected to the core mold body 1.

[0028] From left to right, the core mold body 1 includes a thickened sleeve connecting section 11, an extrusion section 12, and a guide section 13 connected in sequence, with the diameters of the thickened sleeve connecting section 11, the extrusion section 12, and the guide section 13 decreasing sequentially.

[0029] The thickened sleeve 2 is fitted onto the thickened sleeve connecting section 11 and the extrusion section 12, and is adapted and connected to the corresponding thickened sleeve connecting section 11 and extrusion section 12 respectively.

[0030] Preferably, the right end face of the thickened sleeve 2 is flush with the right end face of the extrusion section 12.

[0031] Preferably, the thickened sleeve 2 and the thickened sleeve connecting section 11 are connected together by threads.

[0032] More preferably, an external thread is provided on the outer peripheral surface of the thickened sleeve connecting section 11. The thickened sleeve 2 has a through inner hole, which includes a threaded section 200 and a smooth hole section 202. When the thickened sleeve 2 is installed on the core mold body 1, the threaded section 200 is adapted to the external thread, and the smooth hole section 202 is located outside the extrusion section 12, with a clearance fit between the smooth hole section 202 and the extrusion section 12.

[0033] Preferably, the inner hole further includes a thread relief groove 201, which is located between the threaded section 200 and the smooth hole section 202. From left to right, the threaded section 200, the thread relief groove 201, and the smooth hole section 202 are connected in sequence.

[0034] Preferably, the right end face of the threaded relief groove 201 abuts against the right end face of the thickened sleeve connecting section 11.

[0035] Preferably, a wrench hole 21 is provided on the outer surface of the thickened sleeve 2 to facilitate the installation of the thickened sleeve 2 on the core mold body 1.

[0036] Preferably, a device connection section 10 is also provided at the left end of the thickened sleeve connection section 11. In use, the device connection section 10 is used to connect with a device (not shown in the figure, and the device is prior art, so it will not be described in detail here).

[0037] More preferably, the equipment connecting section 10, the thickened sleeve connecting section 11, the extrusion section 12, and the guide section 13 are an integral structure.

[0038] When the outer diameter of the large end of the tubing mandrel needs to be enlarged while the size of the small end does not need to be enlarged, the tubing mandrel of this utility model can be used. In use, the mandrel body 1 and the thickening sleeve 2 of the tubing mandrel are assembled, and then the tubing mandrel is inserted into the forming mold 4 for extrusion, which can complete the task of quickly thickening the tubing 6 without the need to process a new tubing mandrel, greatly shortening the processing cycle, improving production efficiency, and demonstrating a reasonable design.

[0039] In the description of this specification, it should be understood that the orientation or positional relationship described by terms such as "from left to right", "right end face", "left end", "outer surface", "outer periphery", "external thread", "left end", and "inner hole" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] This utility model is not limited to the above embodiments. All improvements made based on the concept, principle, structure and method of this utility model are within the protection scope of this utility model.

Claims

1. A mandrel for oil pipes, characterized in that, It includes a core mold body and a thickened sleeve, wherein the thickened sleeve is detachably connected to the core mold body; From left to right, the core mold body includes a thickened sleeve connecting section, an extrusion section, and a guide section connected in sequence, with the diameters of the thickened sleeve connecting section, the extrusion section, and the guide section decreasing sequentially. The thickened sleeve is fitted onto the thickened sleeve connecting section and the extrusion section, and is adapted and connected to the corresponding thickened sleeve connecting section and the extrusion section respectively.

2. The tubing mandrel as described in claim 1, characterized in that, The right end face of the thickened sleeve is flush with the right end face of the extrusion section.

3. The tubing mandrel as described in claim 2, characterized in that, The thickened sleeve and the thickened sleeve connecting section are connected together by threads.

4. The tubing mandrel as described in claim 3, characterized in that, The outer circumferential surface of the thickened sleeve connecting section is provided with an external thread; the thickened sleeve has a through inner hole, the inner hole including a threaded section and a smooth hole section; when the thickened sleeve is installed on the core mold body, the threaded section is adapted to the external thread, and the smooth hole section is located outside the extrusion section.

5. The tubing mandrel as described in claim 4, characterized in that, The inner hole also includes a threaded relief groove, which is located between the threaded section and the smooth hole section; from left to right, the threaded section, the threaded relief groove, and the smooth hole section are connected in sequence.

6. The tubing mandrel as described in claim 5, characterized in that, The right end face of the threaded relief groove abuts against the right end face of the thickened sleeve connecting section.

7. The tubing mandrel as described in claim 1, characterized in that, The outer surface of the thickened sleeve is provided with a wrench hole.

8. The tubing mandrel as described in claim 1, characterized in that, The left end of the thickened sleeve connecting section is also provided with an equipment connecting section.

9. The tubing mandrel as described in claim 8, characterized in that, The equipment connecting section, the thickened sleeve connecting section, the extrusion section, and the guide section are an integral structure.

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