A continuous extrusion apparatus for pipes

Abstract

This invention discloses a continuous pipe extrusion device, including an extrusion wheel and an extrusion cavity. The outer circumferential surface of the extrusion wheel has a U-shaped extrusion groove capable of accommodating a rod. Grooves are provided on both sides of the extrusion groove. A first boss and a stop block are provided on the side of the extrusion cavity near the extrusion wheel. The distance between the stop block and the two side walls of the extrusion groove is equal, and there is a gap between the stop block and the top wall of the extrusion groove. The axial movement of the extrusion wheel is less than the gap between the extrusion groove and the stop block, effectively preventing the extrusion cavity from contacting the extrusion wheel during the extrusion process. At the same time, the width of the feed hole of the extrusion cavity is not greater than the width of the stop block, thereby avoiding the generation and introduction of frictional impurities, and thus reducing the leakage rate of the finished pipe. The width of the stop block is 0.8 to 1 times the diameter of the rod, and the height of the stop block is 0.9 to 1.3 times the diameter of the rod. The height of the first boss extending into the extrusion groove is 0.5 mm to 3 mm. The size of the stop block is reasonably set to control the amount of material overflow.

Description

Technical Field

[0001] This invention relates to the technical field of continuous extrusion equipment and its peripheral supporting facilities, and in particular to a continuous pipe extrusion device. Background Technology

[0002] The principle of continuous extrusion of aluminum tubes is as follows: Figure 1 As shown, after the aluminum rod (011) is pressed down by the compaction wheel (012), it is embedded in the wheel groove (014) and rotates together with the extrusion wheel (015) under the action of friction. There is an arc surface on the cavity (013) that matches the outer circumference of the extrusion wheel. Driven by the extrusion wheel, the aluminum rod is fed into the cavity and divided into several strands in the mold. After being re-welded under high temperature and high pressure, it forms a circular tube or microchannel parallel flow aluminum (016) extrusion, forming a continuous product.

[0003] The main problem is that, due to the thin wall of the aluminum tube and the extrusion welding process, any inclusions can cause the aluminum tube to break or lead to leakage due to micropores. Assuming the surface cleanliness of the aluminum rod is guaranteed, inclusions mainly come from iron filings generated by the contact friction between the extrusion wheel and the cavity. There is a risk of contact between the extrusion wheel and the cavity in both the axial and radial directions. At the same time, because continuous extrusion of aluminum tubes requires flow diversion, the metal flow resistance is large, and there is a lot of overflow during the extrusion process. This leads to excessively high temperatures at the contact surface between the extrusion wheel and the cavity during high-speed extrusion, causing premature failure of the extrusion wheel and the cavity.

[0004] Therefore, how to change the current situation in the continuous extrusion production process of aluminum tubes, where inclusions easily lead to leakage, has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous pipe extrusion device to solve the problems existing in the prior art, prevent impurities from entering, and reduce the leakage rate of the finished pipe.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a continuous tube extrusion apparatus, comprising:

[0007] An extrusion wheel has an extrusion groove on its outer circumferential surface that can accommodate a rod. The extrusion groove is annular and coaxially arranged with the extrusion wheel. The axial cross-section of the extrusion groove is U-shaped, and the opening of the extrusion groove faces away from the axis of the extrusion wheel.

[0008] An extrusion cavity is provided, the interior of which can accommodate a flow-dividing mold. A first boss and a stop block are provided on the side of the extrusion cavity near the extrusion wheel. The width direction is parallel to the axis of the extrusion wheel, and the width of the stop block is 0.8 to 1 times the diameter of the rod. The first boss and the stop block extend into the extrusion groove. The cross-section of the stop block parallel to the axis of the extrusion cavity is U-shaped. The distance between the stop block and the two side walls of the extrusion groove is equal, and there is a gap between the stop block and the bottom wall of the extrusion groove. The height of the stop block is 0.9 to 1.3 times the diameter of the rod.

[0009] Preferably, the distance between the baffle block and the two side walls of the extrusion groove is 0.2mm-0.5mm; the height of the first boss extending into the extrusion groove is 0.5mm-3mm.

[0010] Preferably, the side of the extrusion cavity near the extrusion wheel is an arc surface adapted to the outer peripheral surface of the extrusion wheel, and the top surface curvature of the stop block is consistent with the arc surface.

[0011] Preferably, the extrusion cavity has a feed hole on the side near the extrusion wheel, the baffle block and the first boss are disposed on both sides of the feed hole, the feed hole is connected to the interior of the extrusion cavity, and the width of the feed hole is less than or equal to the width of the baffle block.

[0012] Preferably, a second boss is provided on the side of the first boss away from the extrusion wheel, the first boss is disposed on the second boss, and the width of the second boss is wider than the width of the first boss.

[0013] Preferably, the outer circumferential surface of the extrusion wheel has a groove that matches the second boss, the second boss is located in the groove and there is a gap between the second boss and the extrusion wheel.

[0014] Preferably, the extrusion roller is further provided with a cooling channel, which is connected to an external cooling medium.

[0015] Preferably, there are multiple cooling channels, which are evenly distributed circumferentially around the axis of the extrusion wheel.

[0016] Preferably, the continuous tube extrusion device further includes side rollers, a shoe holder, and a mandrel for connecting to the extrusion wheel. The extrusion wheel and the side rollers are both mounted on the mandrel. There are two sets of side rollers, which are arranged on both sides of the extrusion wheel. The mandrel is fitted with a self-aligning roller bearing. The extrusion cavity is located inside the shoe holder.

[0017] Preferably, the bottom wall of the extrusion groove and the top surface of the baffle block are both arc surfaces.

[0018] Compared with the prior art, the present invention achieves the following technical effects: In the continuous pipe extrusion device of the present invention, the rod material as raw material enters the extrusion groove. As the extrusion wheel rotates, the rod material in the extrusion groove is thickened under the extrusion action of the retaining block and the first boss. In the present invention, the distance between the retaining block and the two side walls of the extrusion groove is equal, and there is a gap between the retaining block and the bottom wall of the extrusion groove. The axial movement of the extrusion wheel is less than the gap between the extrusion groove and the retaining block, which effectively avoids the contact between the extrusion cavity and the extrusion wheel during the extrusion process, thereby avoiding the generation and introduction of frictional impurities, and thus reducing the leakage rate of the finished pipe material, while ensuring the uniformity of the material after thickening. In addition, the width of the retaining block is 0.8 to 1 times the diameter of the rod material, and the height of the retaining block is 0.9 to 1.3 times the diameter of the rod material. The size of the retaining block is reasonably set to control the amount of material overflow. The first boss is flush with the side of the retaining block, which further improves the material thickening quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram illustrating the principle of continuous extrusion of aluminum tubes in existing technology;

[0021] Figure 2 This is a front view schematic diagram of the continuous tube extrusion apparatus of the present invention;

[0022] Figure 3 This is a side view schematic diagram of the continuous tube extrusion apparatus of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the continuous tube extrusion apparatus of the present invention;

[0024] Figure 5 This is a partial structural schematic diagram of the continuous pipe extrusion device of the present invention;

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of the middle section structure;

[0026] Figure 7 This is a schematic diagram of the extrusion chamber of the continuous pipe extrusion device of the present invention.

[0027] Among them, 1 is the extrusion wheel, 2 is the extrusion cavity, 3 is the extrusion groove, 4 is the first boss, 5 is the material stop block, 6 is the feed hole, 7 is the second boss, 8 is the groove, 9 is the cooling channel, 10 is the mandrel, 11 is the side roller, 12 is the shoe seat, 13 is the self-aligning roller bearing, 14 is the drive mechanism, 15 is the compaction wheel assembly, 16 is the scraper assembly, 17 is the main shaft system, 18 is the frame, and 19 is the base. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The purpose of this invention is to provide a continuous pipe extrusion device to solve the problems existing in the prior art, prevent impurities from entering, and reduce the leakage rate of the finished pipe.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 2-7 ,in, Figure 2 This is a front view schematic diagram of the continuous tube extrusion apparatus of the present invention. Figure 3 This is a side view schematic diagram of the continuous tube extrusion apparatus of the present invention. Figure 4 This is a cross-sectional schematic diagram of the continuous pipe extrusion apparatus of the present invention. Figure 5 This is a partial structural schematic diagram of the continuous pipe extrusion device of the present invention. Figure 6 for Figure 5 Enlarged schematic diagram of the middle part of the structure. Figure 7 This is a schematic diagram of the extrusion chamber of the continuous pipe extrusion device of the present invention.

[0032] This invention provides a continuous extrusion device for pipes, comprising an extrusion wheel 1 and an extrusion cavity 2. The extrusion groove 3 is annular and coaxially arranged with the extrusion wheel 1. The axial cross-section of the extrusion groove 3 is U-shaped, and the opening of the extrusion groove 3 faces away from the axis of the extrusion wheel 1. The interior of the extrusion cavity 2 can accommodate a flow-dividing die. A first boss 4 and a stop block 5 are provided on the side of the extrusion cavity 2 near the extrusion wheel 1. The width direction is parallel to the axis of the extrusion wheel 1, and the width of the stop block 5 is 0.8 to 1 times the diameter of the rod. The first boss 4 and the stop block 5 extend into the extrusion groove 3. The cross-section of the stop block 5 parallel to the axis of the extrusion cavity 2 is U-shaped. The distance between the stop block 5 and the two side walls of the extrusion groove 3 is equal, and there is a gap between the stop block 5 and the bottom wall of the extrusion groove 3. The height of the stop block 5 is 0.9 to 1.3 times the diameter of the rod.

[0033] In the continuous pipe extrusion device of the present invention, the rod material as raw material enters the extrusion groove 3. As the extrusion wheel 1 rotates, the rod material in the extrusion groove 3 is thickened under the extrusion action of the baffle block 5 and the first boss 4. In the present invention, the distance between the baffle block 5 and the two side walls of the extrusion groove 3 is equal, and there is a gap between the baffle block 5 and the bottom wall of the extrusion groove 3. The axial movement of the extrusion wheel 1 is less than the gap between the extrusion groove 3 and the baffle block 5, which effectively avoids the contact between the extrusion cavity 2 and the extrusion wheel 1 during the extrusion process, thereby avoiding the generation and introduction of friction impurities, and thus reducing the leakage rate of the finished pipe material, while ensuring the uniformity of the material after thickening. In addition, the width of the baffle block 5 is 0.8 to 1 times the diameter of the rod material, and the height of the baffle block 5 is 0.9 to 1.3 times the diameter of the rod material. The size of the baffle block 5 is reasonably set to control the amount of material overflow. The first boss 4 is flush with the side of the baffle block 5, which further improves the quality of material thickening. After being roughened, the material enters the diversion mold located inside the extrusion chamber 2 to continue producing finished pipes.

[0034] The distance between the baffle block 5 and the two side walls of the extrusion groove 3 is 0.2mm-0.5mm; the height of the first boss 4 extending into the extrusion groove 3 is 0.5mm-3mm. By reasonably setting the dimensions of the extrusion groove 3 and the baffle block 5, the amount of material overflow can be controlled in conjunction with these dimensions, and impurities can be prevented from being carried in, thereby reducing the leakage rate of the pipe.

[0035] In this specific embodiment, the side of the extrusion chamber 2 near the extrusion wheel 1 is an arc surface that matches the outer peripheral surface of the extrusion wheel 1. The top surface curvature of the baffle block 5 is consistent with the arc surface to better adapt to the extrusion wheel 1. During the rotation of the extrusion wheel 1, a large amount of material overflow is avoided, ensuring smooth production of the extrusion operation.

[0036] Specifically, the extrusion chamber 2 has a feed hole 6 on the side near the extrusion roller 1. A baffle block 5 and a first boss 4 are disposed on both sides of the feed hole 6. The feed hole 6 is connected to the interior of the extrusion chamber 2. The baffle block 5 is disposed on one side of the feed hole 6, and the width of the feed hole 6 is smaller than the width of the baffle block 5. The coarsened material enters the extrusion chamber 2 through the feed hole 6. The width W1 of the feed hole 6 is less than or equal to the width W of the baffle block 5, which can effectively prevent impurities from entering the interior of the extrusion chamber 2 through the feed hole 6, thereby improving the quality of subsequent products.

[0037] More specifically, a second boss 7 is provided on the side of the first boss 4 away from the extrusion roller 1. The first boss 4 is disposed on the second boss 7. The width of the second boss 7 is wider than the width of the first boss 4, which plays a role in preventing material from overflowing.

[0038] It should also be noted that the outer circumferential surface of the extrusion roller 1 has a groove 8 that matches the second boss 7. The groove 8 serves as a mounting limit. The second boss 7 is located in the groove 8 and there is a gap between the second boss 7 and the extrusion roller 1. The gap between the second boss 7 and the extrusion roller 1 is small, which prevents material overflow as much as possible while avoiding friction and generating grinding impurities.

[0039] Furthermore, the extrusion roller 1 is also provided with a cooling channel 9, which is connected to an external cooling medium. Cooling medium is introduced into the cooling channel 9 to reduce the temperature of the extrusion roller 1, prevent the extrusion roller 1 from overheating, and extend the service life of the extrusion roller 1.

[0040] In other specific embodiments of the present invention, there are multiple cooling channels 9, which are evenly distributed around the axis of the extrusion wheel 1 to improve the cooling uniformity of the extrusion wheel 1. All the cooling channels 9 are connected to the external cooling medium to improve the cooling efficiency.

[0041] In addition, the continuous pipe extrusion device also includes a mandrel 10, side rollers 11, and a shoe holder 12. The extrusion wheel 1 and the side rollers 11 are both mounted on the mandrel 10. There are two sets of side rollers 11, positioned on both sides of the extrusion wheel 1, providing support and improving the operational reliability of the extrusion wheel 1. The mandrel 10 is fitted with self-aligning roller bearings 13 to ensure that the axial movement of the extrusion wheel 1 is less than 0.5mm, further improving the operational reliability of the device. The drive mechanism 14 of the device is connected to the mandrel 10 to drive its rotation. The extrusion chamber 2 is located inside the shoe holder 12. During operation, the position of the shoe holder 12 is adjusted according to the axial position of the extrusion wheel 1 to ensure that the gap C between the stop block 5 and both sides of the extrusion wheel 1 is equal. Furthermore, the continuous pipe extrusion device also includes a compaction wheel assembly 15, a scraper assembly 16, a main shaft system 17, a frame 18, and a base 19.

[0042] The continuous extrusion device for tubes of the present invention is suitable for continuous extrusion of aluminum tubes and other alloy tubes. When the aluminum tube is continuously extruded, the aluminum rod as raw material enters the extrusion groove 3. As the extrusion wheel 1 rotates, the aluminum rod in the extrusion groove 3 is thickened under the extrusion action of the baffle block 5 and the first boss 4. The amount of aluminum overflow is controlled by the cooperation of the groove size of the extrusion wheel 1, the baffle block 5 and the feed hole 6, and impurities are prevented from being carried in, thereby effectively reducing the leakage rate of aluminum tubes.

[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A continuous pipe extrusion apparatus, characterized in that, include: An extrusion wheel has an extrusion groove on its outer circumferential surface that can accommodate a rod. The extrusion groove is annular and coaxially arranged with the extrusion wheel. The axial cross-section of the extrusion groove is U-shaped, and the opening of the extrusion groove faces away from the axis of the extrusion wheel. An extrusion chamber is provided, the interior of which can accommodate a flow-dividing mold. A first boss and a stop block are provided on the side of the extrusion chamber near the extrusion wheel. The width of the stop block is parallel to the axis of the extrusion wheel, and the width of the stop block is 0.8 to 1 times the diameter of the rod. The first boss and the stop block extend into the extrusion groove. The cross-section of the stop block parallel to the axis of the extrusion chamber is U-shaped. The distance between the stop block and the two side walls of the extrusion groove is equal. There is a gap between the stop block and the bottom wall of the extrusion groove. The height of the stop block is 0.9 to 1.3 times the diameter of the rod. The axial movement of the extrusion wheel is less than the gap between the extrusion groove and the stop block. The distance between the baffle block and the two side walls of the extrusion groove is 0.2mm-0.5mm; the height of the first boss extending into the extrusion groove is 0.5mm-3mm; A second boss is provided on the side of the first boss away from the extrusion wheel. The first boss is disposed on the second boss, and the width of the second boss is wider than the width of the first boss. The outer circumferential surface of the extrusion wheel has a groove that matches the second boss. The second boss is located in the groove, and there is a gap between the second boss and the extrusion wheel.

2. The continuous pipe extrusion apparatus according to claim 1, characterized in that: The extrusion chamber has a feed hole on the side near the extrusion wheel. The baffle block and the first boss are disposed on both sides of the feed hole. The feed hole is connected to the interior of the extrusion chamber. The width of the feed hole is less than or equal to the width of the baffle block.

3. The continuous pipe extrusion apparatus according to claim 1, characterized in that: The extrusion roller is also provided with a cooling channel, which is connected to an external cooling medium.

4. The continuous pipe extrusion apparatus according to claim 3, characterized in that: The cooling channels are multiple, and these multiple cooling channels are evenly distributed circumferentially around the axis of the extrusion wheel.

5. The continuous pipe extrusion apparatus according to claim 1, characterized in that: It also includes side rollers, a shoe holder, and a mandrel for connecting to the extrusion wheel. The extrusion wheel and the side rollers are both mounted on the mandrel. There are two sets of side rollers, which are arranged on both sides of the extrusion wheel. The mandrel is fitted with a self-aligning roller bearing. The extrusion cavity is located inside the shoe holder.

6. The continuous tube extrusion apparatus according to any one of claims 1-5, characterized in that: The bottom wall of the extrusion groove and the top surface of the baffle block are both curved surfaces.

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