Device for improving drawing straightness of cold drawn pipe

Abstract

The utility model discloses a device for improving the drawing straightness of a cold drawn pipe, which is used for drawing the cold drawn pipe by a drawing machine, and comprises a drawing die seat, an outer die assembly and a limiting fixture block, the drawing die seat is provided with an outer die assembly mounting hole penetrating along the moving axial direction of the cold drawn pipe, and the end face of the outer die assembly mounting hole is provided with a limiting base groove; the outer die assembly is detachably mounted on the outer die assembly mounting hole of the drawing die base, a matching groove corresponding to the limiting base groove is formed in the periphery of the outer die assembly, and a drawing pipe conical channel suitable for a cold drawing pipe to pass through is formed in the outer die assembly; the limiting clamping block is suitable for being embedded in a limiting groove formed by combining the limiting base groove and the matching groove so as to limit displacement of the outer die assembly relative to the drawing die base. The cold-drawn pipe straightening device can improve straightness of the cold-drawn pipe and prevent the finished cold-drawn pipe from being bent.

Description

Technical Field

[0001] The utility model relates to a device for improving the drawing straightness of cold-drawn tubes, belonging to the technical field of cold-drawn tubes. Background Art

[0002] At present, cold-drawing of tubes is a common metal processing technology, which is widely used in manufacturing various precision tubes. This technology stretches metal tubes through a die at room temperature to reach the required size and straightness. However, during the cold-drawing process, the straightness of the tubes is often affected by various factors, resulting in certain straightness errors in the finished products. These errors not only affect the quality of the products, but also may cause difficulties in subsequent processing, reducing the production efficiency and the market competitiveness of the products.

[0003] After retrieving the prior art, it is found that a Chinese patent with the publication number CN220092601U discloses a straightening mechanism for hydraulic cylinder cold-drawn tubes. In this patent, a straightening machine is used for straightening. However, during the use process, it is found that since the outer die sleeve may shift during the working process, the surface contact with the tube changes. This change will cause the finished tube to bend, which will have an adverse effect on the subsequent heat treatment process. For example, the bent tube is prone to cause a furnace jamming phenomenon during the heat treatment process, resulting in equipment damage. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a device for improving the drawing straightness of cold-drawn tubes, which can improve the straightness of cold-drawn tube straightening and avoid the bending of finished cold-drawn tubes.

[0005] To solve the above technical problem, the technical solution of the utility model is: a device for improving the drawing straightness of cold-drawn tubes, used for a drawing machine to draw cold-drawn tubes, comprising:

[0006] A drawing die seat, on which an outer die assembly installation hole is provided through along the moving axial direction of the cold-drawn tube, and a limiting base groove is provided on the end face of the outer die assembly installation hole;

[0007] An outer die assembly, which is detachably installed on the outer die assembly installation hole of the drawing die seat. A matching groove corresponding to the limiting base groove is provided on the outer periphery of the outer die assembly, and a drawing tube tapered channel suitable for the cold-drawn tube to pass through is provided inside the outer die assembly;

[0008] A limiting block, which is suitable for being embedded on the limiting groove formed by the combination of the limiting base groove and the matching groove to limit the displacement of the outer die assembly relative to the drawing die seat.

[0009] Furthermore, a specific structure of the drawing die seat is provided. The drawing die seat comprises:

[0010] A fixing base, at least one guiding installation groove extending along the height direction of the fixing base is arranged on the inner side wall of the fixing base, and the cross-section of the guiding installation groove is in the shape of a dovetail groove;

[0011] An outer mold support block, a dovetail protrusion matching the guiding installation groove is arranged on the side surface of the outer mold support block, and the outer mold support block is adapted to be slidably embedded in the guiding installation groove through the dovetail protrusion;

[0012] The limiting base groove and the outer mold assembly installation hole are arranged on the outer mold support block.

[0013] Furthermore, a specific structure of the fixing base is provided, and the fixing base includes:

[0014] A base platform;

[0015] A surrounding edge wall, the surrounding edge wall is arranged on the outer edge of the base platform, and the surrounding edge wall forms a closed edge on the base platform.

[0016] Furthermore, a specific structure of a limiting block is provided, and a limiting block guiding groove extending along the vertical direction thereof is arranged on the outer mold support block;

[0017] The limiting block includes:

[0018] A transverse positioning block, the transverse positioning block is slidably arranged in the limiting block guiding groove of the outer mold support block;

[0019] A longitudinal block, the longitudinal block is detachably installed on the transverse positioning block;

[0020] One end of the longitudinal block is adapted to be embedded in the limiting groove to limit the movement of the outer mold assembly relative to the mold pulling base.

[0021] Furthermore, a specific connection manner between the transverse positioning block and the longitudinal block is provided, and the transverse positioning block and the longitudinal block are connected by bolts.

[0022] Furthermore, a specific structure of an outer mold assembly is provided, and the outer mold assembly includes:

[0023] A detachable taper sleeve, the detachable taper sleeve is detachably installed in the outer mold assembly installation hole of the outer mold support block, and an inner taper hole is arranged on the detachable taper sleeve;

[0024] An outer mold taper sleeve, the outer mold taper sleeve is coaxially sleeved in the inner taper hole of the detachable taper sleeve, a taper surface fit is formed between the outer surface of the outer mold taper sleeve and the inner taper hole of the detachable taper sleeve, and a central taper hole is arranged on the outer mold taper sleeve;

[0025] The outer die is installed in the central conical hole of the outer die cone sleeve, and a draw tube conical channel is provided on the outer die.

[0026] Furthermore, an annular groove is provided on the outer die support block;

[0027] An annular protrusion is provided on the outer peripheral surface of the detachable cone sleeve;

[0028] The annular protrusion of the detachable cone sleeve is adapted to be embedded in the annular groove to form an axial positioning structure for restricting the axial movement of the detachable cone sleeve on the outer die support block.

[0029] Furthermore, the mating groove is provided on the annular protrusion of the detachable cone sleeve.

[0030] Furthermore, the outer die is provided with an inlet end and an outlet end, and the inner wall surface of the outer die is in a conical structure, wherein the inner diameter of the inlet end is larger than the inner diameter of the outlet end, and the inner wall surface of the outer die forms a draw tube conical channel that gradually narrows from the inlet end to the outlet end.

[0031] Furthermore, an arc-shaped transition surface is provided between the inlet end of the outer die and the inner wall surface.

[0032] Adopting the above technical solutions, the present utility model has the following beneficial effects:

[0033] In the present utility model, by providing a through outer die assembly mounting hole on the drawing die base and a limiting base groove on the end face, the outer die assembly is mounted on the drawing die base, and then a mating groove corresponding to the limiting base groove is provided on the outer periphery of the outer die assembly. By inserting the limiting block into the limiting groove formed by the limiting base groove and the mating groove, the displacement of the outer die assembly relative to the drawing die base is restricted. This structural design effectively prevents the cold drawn tube from bending caused by the displacement of the outer die assembly, ensures that the cold drawn tube can maintain good straightness during the drawing process, thereby improving production efficiency and reducing the labor intensity of personnel.

[0034] In addition, by providing a guiding installation groove in the fixed seat and a dovetail protrusion on the outer die support block, it is ensured that the outer die support block can be stably slid and inserted; through the cooperation of the annular protrusion of the detachable cone sleeve and the annular groove of the outer die support block, an axial positioning structure is realized to restrict the axial movement of the detachable cone sleeve; through the conical channel formed by the inner diameter difference between the inlet end and the outlet end of the outer die, it is ensured that the cold drawn tube can be gradually formed when passing through the outer die. These structural designs further improve the stability and precision, and enhance the overall reliability and production efficiency.

[0035] In summary, the present utility model ensures that the cold drawn tube maintains good straightness during the drawing process, effectively solves the problem of cold drawn tube bending caused by the displacement of the outer die assembly; secondly, it improves production efficiency and reduces the labor intensity of workers. Brief Description of the Drawings

[0036] Figure 1 This is a schematic perspective view of the device for improving the drawing straightness of cold-drawn tubes according to the present utility model;

[0037] Figure 2 This is an exploded view of the device for improving the drawing straightness of cold-drawn tubes according to the present utility model. Detailed implementation manners

[0038] In order to make the content of the present utility model be more clearly understood, the following further describes the present utility model in detail according to specific embodiments in conjunction with the accompanying drawings.

[0039] As Figure 1-2 shown, a device for improving the drawing straightness of cold-drawn tubes, which is used for drawing cold-drawn tubes by a drawing machine, includes:

[0040] A die holder 1, on which there is an outer die assembly installation hole penetrating along the axial direction of the movement of the cold-drawn tube, and a limiting base groove is provided on the end face of the outer die assembly installation hole;

[0041] An outer die assembly 2, which is detachably installed on the outer die assembly installation hole of the die holder 1. A mating groove corresponding to the limiting base groove is provided on the outer periphery of the outer die assembly 2, and a drawing tube tapered channel suitable for the cold-drawn tube to pass through is provided inside the outer die assembly 2;

[0042] A limiting block 3, which is adapted to be embedded in the limiting groove formed by the combination of the limiting base groove and the mating groove to limit the displacement of the outer die assembly 2 relative to the die holder 1.

[0043] In this embodiment, as Figure 1 shown, in this embodiment, by providing a penetrating outer die assembly installation hole on the die holder 1 and a limiting base groove on the end face, the outer die assembly 2 is installed on the die holder 1, and then a mating groove corresponding to the limiting base groove is provided on the outer periphery of the outer die assembly 2. By embedding the limiting block 3 into the limiting groove formed by the limiting base groove and the mating groove, the displacement of the outer die assembly 2 relative to the die holder 1 is restricted. The problem of cold-drawn tube bending caused by the displacement of the outer die assembly 2 is avoided, ensuring that the cold-drawn tube can maintain good straightness during the drawing process, thereby improving production efficiency and reducing the labor intensity of personnel.

[0044] Specifically, as Figure 1-2 shown, the die holder 1 may have the following structure, including:

[0045] A fixed seat 11, on the inner side wall of which there is a guiding installation groove extending along the height direction of the fixed seat 11, and the cross section of the guiding installation groove is in the shape of a dovetail groove;

[0046] The outer mold support block 12 has a dovetail protrusion on its side that matches the guiding installation groove, and the outer mold support block 12 is adapted to be slidably inserted into the guiding installation groove through the dovetail protrusion;

[0047] The limiting base groove and the outer mold assembly installation hole are arranged on the outer mold support block 12.

[0048] Specifically, as Figure 2 shown, the fixing base 11 can have the following structure, including:

[0049] A base platform;

[0050] A surrounding side wall, which is arranged on the outer edge of the base platform, and the surrounding side wall forms a closed edge on the base platform.

[0051] In this embodiment, as Figure 2 shown, there are two guiding installation grooves, respectively on the left and right sides. The outer mold support block 12 and the fixing base 11 can be conveniently disassembled when needed, improving the flexibility and maintainability of the equipment. The surrounding side wall arranged on the outer edge of the base platform forms a closed edge, so that during the process of cold drawing the tube, impurities or other substances on the outer surface of the cold drawn tube can fall into it.

[0052] Specifically, as Figure 1-2 shown, the outer mold support block 12 is provided with a limiting block guiding groove extending along its vertical direction;

[0053] The limiting block 3 includes:

[0054] A transverse positioning block 31, which is slidably arranged in the limiting block guiding groove of the outer mold support block 12;

[0055] A longitudinal block 32, which is detachably installed on the transverse positioning block 31;

[0056] One end of the longitudinal block 32 is adapted to be embedded in the limiting groove to limit the movement of the outer mold assembly 2 relative to the drawing die base 1.

[0057] Specifically, as Figure 2 shown, the transverse positioning block 31 and the longitudinal block 32 are connected by bolts.

[0058] In this embodiment, as Figure 1-2As shown, the limiting block guiding groove extending in the vertical direction on the outer mold support block 12 provides an installation basis for the limiting block 3, enabling the limiting block 3 to adapt to outer mold components 2 of different sizes in the vertical direction and improving the scope of application. The longitudinal block 32 is detachably installed on the transverse positioning block 31, and one end of it is embedded in the limiting groove, effectively restricting the movement of the outer mold component 2 relative to the mold pulling seat 1, ensuring the stability of the outer mold component 2 during the working process, and enabling the longitudinal block 32 to be quickly adjusted or replaced according to actual needs.

[0059] In some embodiments, the connection method between the transverse positioning block 31 and the longitudinal block 32 is not limited to bolt connection and can be set according to specific requirements.

[0060] Specifically, as Figure 1-2 shown, the outer mold component 2 can have the following structure, including:

[0061] A detachable taper sleeve 21, which is detachably installed in the outer mold component installation hole of the outer mold support block 12, and an inner taper hole is provided on the detachable taper sleeve 21;

[0062] An outer mold taper sleeve 22, which is coaxially sleeved in the inner taper hole of the detachable taper sleeve 21, a tapered surface fit is formed between the outer surface of the outer mold taper sleeve 22 and the inner taper hole of the detachable taper sleeve 21, and a central taper hole is provided on the outer mold taper sleeve 22;

[0063] An outer mold 23, which is installed in the central taper hole of the outer mold taper sleeve 22, and a pull tube tapered channel is provided on the outer mold 23.

[0064] In this embodiment, as Figure 1-2 shown, the outer mold component 2 consists of three main components: a detachable taper sleeve 21, an outer mold taper sleeve 22, and an outer mold 23. The detachable taper sleeve 21, as the outermost structure, can be conveniently detached from the outer mold support block 12, facilitating daily maintenance and replacement.

[0065] Specifically, as Figure 2 shown, an annular groove is provided on the outer mold support block 12;

[0066] An annular protrusion is provided on the outer peripheral surface of the detachable taper sleeve 21;

[0067] The annular protrusion of the detachable taper sleeve 21 is adapted to be embedded in the annular groove to form an axial positioning structure for restricting the axial movement of the detachable taper sleeve 21 on the outer mold support block 12.

[0068] Specifically, as Figure 1-2 shown, a mating groove is provided on the annular protrusion of the detachable taper sleeve 21.

[0069] In this embodiment, as Figure 2As shown, the annular groove provided on the outer mold support block 12 and the annular protrusion on the outer peripheral surface of the detachable tapered sleeve 21 form an axial positioning structure. It can not only effectively restrict the axial movement of the detachable tapered sleeve 21 on the outer mold support block 12, but also ensure that the two can be accurately aligned during the installation process, improving the assembly accuracy and stability.

[0070] Specifically, as Figure 2 shown, the outer mold 23 is provided with an inlet end and an outlet end. The inner wall surface of the outer mold 23 is in a conical structure, where the inner diameter of the inlet end is larger than that of the outlet end, and the inner wall surface of the outer mold 23 forms a drawing tube conical channel that gradually narrows from the inlet end to the outlet end.

[0071] Specifically, as Figure 2 shown, an arc-shaped transition surface is provided between the inlet end of the outer mold 23 and the inner wall surface.

[0072] In this embodiment, as Figure 2 shown, the drawing tube conical channel can apply uniform pressure to the cold-drawn tube when the cold-drawn tube passes through, realizing the gradual reduction of the diameter and the thinning of the wall thickness of the cold-drawn tube, so as to achieve the required dimensions and mechanical properties.

[0073] The arc-shaped transition surface provided between the inlet end of the outer mold 23 and the inner wall surface can reduce the friction and stress concentration of the cold-drawn tube when it enters the drawing tube conical channel, helping to prevent scratches or other defects on the surface of the cold-drawn tube, and at the same time reducing the energy consumption during the drawing process. In addition, the arc-shaped transition surface can also guide the cold-drawn tube to enter the conical channel more easily, improving the stability and efficiency of the drawing process.

[0074] During the actual use process, the cold-drawn tube first passes through the inlet end of the outer mold 23, and then smoothly enters the drawing tube conical channel through the arc-shaped transition surface. As the cold-drawn tube advances in the channel, it will be subjected to gradually increasing radial pressure, resulting in plastic deformation. This deformation reduces the diameter of the cold-drawn tube and increases its length at the same time. Finally, the processed cold-drawn tube leaves from the outlet end, meeting the expected size and performance requirements.

[0075] In the above specific embodiments, the technical problems solved, technical solutions and beneficial effects of the present utility model are further described in detail. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A device for improving the straightness of cold-drawn tubes, used for cold-drawn tubes drawn by drawing machines, characterized in that: include: A drawing die seat (1), wherein the drawing die seat (1) is provided with an outer die assembly mounting hole penetrating along the axial direction of movement of the cold-drawn tube, and a limiting base groove is provided on the end surface of the outer die assembly mounting hole; An outer die assembly (2), the outer die assembly (2) being detachably mounted on the outer die assembly mounting hole of the drawing die seat (1), a matching groove corresponding to the limiting base groove being provided on the outer periphery of the outer die assembly (2), and a tube drawing tapered passage suitable for the cold-drawn tube to pass through being provided inside the outer die assembly (2); A limit block (3), wherein the limit block (3) is adapted to be embedded in a limit groove formed by combining the limit base groove and the matching groove to limit the displacement of the outer mold assembly (2) relative to the die seat (1).

2. The device for improving the straightness of cold drawn tube according to claim 1, characterized in that: The die holder (1) comprises: A fixing seat (11), wherein at least one guide installation groove extending in the height direction of the fixing seat (11) is provided on the inner side wall of the fixing seat (11), and the cross section of the guide installation groove is in the shape of a dovetail groove; An outer mold support block (12), wherein a dovetail protrusion matching the guide installation groove is provided on a side surface of the outer mold support block (12), and the outer mold support block (12) is suitable for slidingly embedding in the guide installation groove through the dovetail protrusion; The limiting base groove and the outer mold assembly mounting hole are arranged on the outer mold support block (12).

3. The device for improving the straightness of cold drawn tube according to claim 2, characterized in that: The fixing seat (11) comprises: Base platform; A peripheral wall is arranged on the outer edge of the base platform, and the peripheral wall forms a closed edge on the base platform.

4. The device for improving the straightness of cold drawn tube according to claim 2, characterized in that: The outer mold support block (12) is provided with a limit block guide groove extending in its vertical direction; The limit block (3) comprises: A transverse positioning block (31), the transverse positioning block (31) being slidably disposed in a limiting block guide groove of the outer mold support block (12); A longitudinal clamping block (32), wherein the longitudinal clamping block (32) is detachably mounted on the transverse positioning block (31); One end of the longitudinal clamping block (32) is suitable for being embedded in the limiting groove to limit the movement of the outer mold assembly (2) relative to the drawing die seat (1).

5. The device for improving the straightness of cold drawn tube according to claim 4, characterized in that: The transverse positioning block (31) and the longitudinal clamping block (32) are connected via bolts.

6. The device for improving the straightness of cold drawn tube according to claim 2, characterized in that: The outer mold component (2) comprises: A detachable cone sleeve (21), wherein the detachable cone sleeve (21) is detachably mounted in an outer mold component mounting hole of the outer mold support block (12), and an inner cone hole is provided on the detachable cone sleeve (21); An outer mold cone sleeve (22), the outer mold cone sleeve (22) is coaxially sleeved in the inner cone hole of the detachable cone sleeve (21), the outer surface of the outer mold cone sleeve (22) and the inner cone hole of the detachable cone sleeve (21) form a cone surface fit, and the outer mold cone sleeve (22) is provided with a central cone hole; The outer mold (23) is installed in the central cone hole of the outer mold cone sleeve (22), and the outer mold (23) is provided with a tube drawing cone channel.

7. The device for improving the straightness of cold drawn tube according to claim 6, characterized in that: The outer mold support block (12) is provided with an annular groove; The outer peripheral surface of the detachable cone sleeve (21) is provided with an annular protrusion; The annular protrusion of the detachable cone sleeve (21) is suitable for being embedded in the annular groove to form an axial positioning structure to limit the axial movement of the detachable cone sleeve (21) on the outer mold support block (12).

8. The device for improving the straightness of cold drawn tube according to claim 7, characterized in that: The matching groove is arranged on the annular protrusion of the detachable cone sleeve (21).

9. The device for improving the straightness of cold drawn tube according to claim 6, characterized in that: The outer mold (23) is provided with an inlet end and an outlet end, and the inner wall surface of the outer mold (23) is in a conical structure, wherein the inner diameter of the inlet end is larger than the inner diameter of the outlet end, and the inner wall surface of the outer mold (23) forms a tube drawing conical channel that gradually narrows from the inlet end to the outlet end.

10. The device for improving the straightness of cold drawn tube according to claim 9, characterized in that: An arc-shaped transition surface is provided between the inlet end and the inner wall surface of the outer mold (23).

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