Porous aluminum alloy flat tube extrusion forming die and processing technology

Abstract

The present application belongs to the field of aluminum profile processing, and particularly relates to a porous aluminum alloy flat tube extrusion forming die and processing technology, which comprises a die sleeve, a positive die, a push rod, a plug, a core barrel and a die core. The die sleeve is in the shape of a hollow sleeve. The positive die is in the shape of a hollow sleeve, is arranged at one end of the sleeve of the die sleeve, and the shape of the outer wall of the positive die corresponds to that of the inner wall of the die sleeve. The push rod moves the positive die in the sleeve of the die sleeve. The plug is in the shape of a sleeve, is arranged at the other end of the sleeve of the die sleeve, and the shape of the outer wall of the plug corresponds to that of the inner wall of the die sleeve. The core barrel abuts against the plug. The die core is arranged in the core barrel, one end of the die core penetrates the sleeve of the plug, extends into the sleeve of the die sleeve, and can be extended and retracted back and forth, a nitrogen gas passage is arranged in the die core, the outlet of the nitrogen gas passage is arranged at the end of one end of the die core, and the shape of the outer wall of one end of the die core corresponds to that of the inner wall of the positive die to form a model cavity. The present application uses a special die and processing technology to ensure that the porous aluminum alloy flat tube will not collapse and deform in the process of forming extrusion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aluminum profile processing, and particularly relates to a porous aluminum alloy flat tube extrusion forming die and processing technology. BACKGROUND

[0002] With the rapid development of the aluminum extrusion industry, the product quality requirements for the porous aluminum flat tube are higher and higher, and higher quality requirements are put forward for the manufacturing and application of the extrusion die. However, since the temperature of the porous aluminum flat tube is very high during the extrusion forming stage, the tube wall is very thin, the flat tube is continuously extruded, and the die core head is tightly combined with the inner wall of the flat tube, the internal part of the flat tube cannot exchange air with the external part after extruding a certain length, causing a vacuum to be formed in the flat tube, and due to the high temperature and vacuum pressure, the extruded aluminum flat tube often collapses and deforms, reducing the product precision. Moreover, the stress on the discharge port of the extrusion die is very large during the extrusion process, the extrusion die is severely damaged, and the service life is short, resulting in high production cost. SUMMARY

[0003] The porous aluminum alloy flat tube extrusion forming die and processing technology provided by the present application can effectively prevent the porous aluminum alloy flat tube from collapsing and deforming during the forming extrusion process.

[0004] The porous aluminum alloy flat tube extrusion forming die provided by the present application comprises a die sleeve, a positive die, a push rod, a plug, a core barrel, and a die core. The die sleeve is a hollow sleeve. The positive die is also a hollow sleeve, and is arranged at one end of the die sleeve. The outer wall shape of the positive die corresponds to the inner wall shape of the die sleeve. The push rod moves the positive die in the sleeve of the die sleeve. The plug is also a sleeve, and is arranged at the other end of the die sleeve. The outer wall shape of the plug corresponds to the inner wall shape of the die sleeve. The core barrel abuts against the plug. The die core is arranged in the core barrel, and one end of the die core penetrates the plug sleeve and extends into the die sleeve and can be extended and retracted. The die core is provided with a nitrogen channel, and the outlet of the nitrogen channel is arranged at the end of the die core. The outer wall shape of the one end of the die core corresponds to the inner wall shape of the positive die, so as to form a die cavity.

[0005] As a further optimization of the present application, the inner hole of the cross section of the die sleeve is rectangular.

[0006] As a further optimization of the present application, the outer wall of the positive die is provided with grooves on the four faces.

[0007] As a further optimization of the present application, the inner hole of the cross section of the positive die is a waist round hole.

[0008] As a further optimization of the present application, the die core comprises a plurality of arrayed core rods. Each core rod is provided with a nitrogen channel.

[0009] As a further optimization of the present application, the number of core rods is 5.

[0010] As a further optimization of the present application, the other end of the several core rods is integrated; the gas inlet end of the nitrogen gas channel is arranged at the other end of the core rod and is branched to each core rod.

[0011] As a further optimization of the present application, the core barrel is sleeve-shaped, and the core barrel is sleeved outside the mold core.

[0012] The present application also provides a porous aluminum alloy flat tube extrusion forming processing technology, comprising the mold and further comprising the following steps:

[0013] S1: the core barrel pushes the plug into the other end of the mold sleeve sleeve;

[0014] S2: the push rod pushes the positive mold, and the positive mold pushes the heated blank to move in the mold sleeve sleeve until the blank abuts against the plug;

[0015] S3: the mold core passes through the plug until the one end of the mold core reaches the positive mold sleeve and the shape of the outer wall of the one end of the mold core forms a mold cavity with the shape of the inner wall of the positive mold, and nitrogen gas enters the nitrogen gas channel;

[0016] S4: the push rod pushes the positive mold and extrudes the blank, and in the process of extruding the blank by the positive mold, the mold core retreats to maintain the shape of the mold cavity, and nitrogen gas enters the pores of the formed aluminum alloy flat tube through the nitrogen gas channel;

[0017] S5: the blank is extrusion formed, and the aluminum alloy flat tube is taken out and cut off at both ends.

[0018] As a further optimization of the present application, step S5 comprises the following steps:

[0019] S5': the blank is extrusion formed, the core barrel and the mold core retreat, and the push rod continues to push the positive mold to move forward until the tail end of the blank is exposed from the mold sleeve;

[0020] S5'': the tail end of the blank is cut off, the puller pulls out the flat tube, and the head end of the flat tube is cut off.

[0021] The present application provides a porous aluminum alloy flat tube extrusion forming mold and processing technology, which uses a specially designed mold and processing technology to ensure that the porous aluminum alloy flat tube does not collapse and deform during the forming and extrusion process. In addition, nitrogen gas can also play a role in cooling the mold core, thereby reducing the wear of the mold core caused by high temperature and increasing the service life. In addition, since the flat tube is filled with nitrogen gas, oxidation caused by contact with air at high temperature can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of the cross section of the porous aluminum alloy flat tube after forming in this embodiment;

[0023] Figure 2 is a schematic view of the mold processing principle in this embodiment;

[0024] Figure 3 is a schematic diagram of the structure of the positive mold in the embodiment;

[0025] Figure 4 is a schematic diagram of the structure of the mold core in the embodiment;

[0026] In the figure, the mold sleeve 1, the positive mold 2, the push rod 3, the plug 4, the core barrel 5, the mold core 6, the nitrogen channel 6a, the blank 7, and the flat tube 8. DETAILED DESCRIPTION

[0027] The mold provided in the embodiment is used for Figure 1 As shown in the figure, the porous aluminum alloy flat tube 8 is wide and has many holes. During the extrusion forming process, the flat tube 8 often collapses and deforms due to high temperature and vacuum pressure, which seriously affects the product quality.

[0028] In the embodiment, the mold, as shown in the figure, includes the mold sleeve 1, the positive mold 2, the push rod 3, the plug 4, the core barrel 5, and the mold core 6. Figure 2

[0029] The mold sleeve 1 is a hollow sleeve. The mold sleeve 1 not only sleeves the positive mold 2 and the mold core 6, but also completes the forming process of the blank 7 in the sleeve of the mold sleeve 1. In the embodiment, the sleeve of the mold sleeve 1 is a quadrangular prism, that is, the cross section of the sleeve of the mold sleeve 1 is rectangular.

[0030] The positive mold 2 is also a hollow sleeve. The positive mold 2 is arranged at one end of the sleeve of the mold sleeve 1. The positive mold 2 is also a quadrangular prism, that is, the cross section of the positive mold 2 is rectangular. The cross section of the positive mold 2 corresponds to the cross section of the sleeve of the mold sleeve 1. The four side walls of the positive mold 2 are in close contact with the inner wall of the sleeve of the mold sleeve 1. The positive mold 2 can move back and forth in the sleeve of the mold sleeve 1. In order to reduce the frictional resistance between the positive mold 2 and the inner wall of the sleeve of the mold sleeve 1, as shown in the figure, grooves are arranged on the four side walls of the positive mold 2 in the embodiment. The contact area between the positive mold 2 and the inner wall of the sleeve of the mold sleeve 1 is reduced to reduce the frictional resistance. Figure 3

[0031] The push rod 3 pushes the positive mold 2 to move in the sleeve of the mold sleeve 1. The push rod 3 should be provided with a certain accommodation space for the flat tube 8 after forming to pass out.

[0032] ​​The plug 4 is arranged in the sleeve of the mold sleeve 1, the outer wall of the plug 4 corresponds to the shape of the inner wall of the mold sleeve 1, the whole plug 4 is also in the shape of a quadrangular prism, that is, the cross section of the plug 4 is also in the shape of a rectangle, the shape of the cross section of the plug 4 corresponds to the shape of the cross section of the sleeve of the mold sleeve 1, the four walls of the plug 4 fit the inner wall of the sleeve of the mold sleeve 1, the plug 4 can move back and forth in the sleeve of the mold sleeve 1, in order to reduce the frictional resistance between the plug 4 and the inner wall of the sleeve of the mold sleeve 1, the thickness of the plug 4 should be as small as possible, so as to reduce the contact area between the side wall of the plug 4 and the inner wall of the sleeve of the mold sleeve 1, the plug 4 is arranged to be movable in the sleeve of the mold sleeve 1, on the one hand, it is convenient to take out the positive mold 2, on the other hand, it is convenient to clean the inner wall of the sleeve of the mold sleeve 1, and it is also convenient to take out the formed flat tube 8. The plug 4 is also in the shape of a sleeve, the sleeve of the plug 4 is used for the mold core 6 to pass through, the shape of the sleeve of the plug 4 corresponds to the mold core 6, that is, the inner wall of the sleeve of the plug 4 fits the outer wall of the mold core 6, and the mold core 6 can pass through the sleeve of the plug 4 back and forth.

[0033] The core barrel 5 abuts against the plug 4, the core barrel 5 is used to push the plug 4 into the other end of the sleeve of the mold sleeve 1, and is also used to abut against the plug 4 during the forming process. In the embodiment, the core barrel 5 is in the shape of a sleeve, the core barrel is sleeved on the mold core 6, and a pushing mechanism is further arranged in the core barrel 5 and used to push and pull back the mold core 6.

[0034] One end of the mold core 6 penetrates the sleeve of the plug 4 and extends into the sleeve of the mold sleeve 1, the mold core 6 is provided with a nitrogen channel 6a, the outlet of the nitrogen channel 6a is arranged at the end of one end of the mold core 6, and the shape of the outer wall of one end of the mold core 6 can form a model cavity corresponding to the shape of the inner wall of the positive mold 2 to form the flat tube 8, as shown in Figure 4 In the embodiment, five holes are arranged in the flat tube 8, therefore, the mold core 6 is composed of five core rods, the five core rods are arranged in an array, and each core rod is provided with a nitrogen channel. The other end of the five core rods is an integral structure, the gas inlet end of the nitrogen channel 6a is arranged in the integral structure, and a shunt structure of one gas inlet and five gas outlets is realized.

[0035] The mold adopting the embodiment has a processing process including the following steps:

[0036] S1: The core barrel 5 pushes the plug 4 into the other end of the sleeve of the mold sleeve 1, at this time, the end of one end of the mold core 6 does not extend out, that is, the end of one end of the mold core 6 is still in the plug 4 and has not penetrated the sleeve of the plug 4;

[0037] S2: The push rod 3 pushes the positive mold 2, the positive mold 2 pushes the heated blank 7 to move in the sleeve of the mold sleeve 1, until the blank 7 abuts against the plug 4;

[0038] S3: One end of the mold core 6 extends from the end of the core barrel 5, passes through the plug 4, until the one end of the mold core 6 reaches the sleeve of the positive mold 2 and the shape of the outer wall of the one end of the mold core 6 forms a model cavity of the flat tube 8 with the shape of the inner wall of the positive mold 2; in this step, the mold core 6 extrudes the blank 7, so that a part of the blank 7 enters the sleeve of the positive mold 2 and forms an end of the flat tube 8 after forming and a sealing structure; at the same time, nitrogen enters the nitrogen pipeline;

[0039] S4: The push rod 3 pushes the positive mold 2 and extrudes the blank 7, and the blank 7 forms a flat tube structure corresponding to the shape of the model cavity after being extruded out of the model cavity; during the process that the positive mold 2 extrudes the blank 7, the mold core 6 retreats, and the speed of the mold core 6 retreats is consistent with the speed of the push rod 3 advances, so that the shape of the outer wall of the one end of the mold core 6 and the shape of the inner wall of the sleeve of the positive mold 2 maintain the shape of the model cavity of the flat tube 8 during the advancing process of the push rod 3, and at the same time, nitrogen enters the hole of the formed aluminum alloy flat tube 8 through the nitrogen passage 6a;

[0040] S5: The blank 7 is extruded and formed, and the aluminum alloy flat tube 8 is taken out and cut off at both ends.

[0041] Specifically, step S5 includes the following steps:

[0042] S5': After the blank 7 is extruded and formed, the core barrel 5 and the mold core 6 retreat, the push rod 3 continues to push the positive mold 2 to advance, until the residual tail end of the blank 7 is exposed from the mold sleeve 1;

[0043] S5'': The residual tail end of the blank 7 is cut off, then the puller pulls the flat tube 8 to make the flat tube 8 separate from the mold sleeve 1, and finally the solid part of the flat tube 8 at the head end is cut off.

[0044] The embodiment utilizes a specially designed mold and a processing technology, and through the pressure of nitrogen, on the one hand, the porous aluminum alloy flat tube 8 cannot be deformed during the forming and extruding process, and on the other hand, the mold core 6 is protected from being easily extruded and deformed to a certain extent, thereby prolonging the service life of the mold.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A porous aluminum alloy flat tube extrusion forming die characterized by, The mould set comprises a mould sleeve, a positive mould, a push rod, a plug, a core barrel and a mould core; the mould sleeve is a hollow sleeve; the positive mould is a hollow sleeve, and is arranged in one end of the sleeve of the mould sleeve; the outer wall of the positive mould corresponds to the inner wall of the mould sleeve; the push rod pushes the positive mould to move in the sleeve of the mould sleeve; the plug is a sleeve, and is arranged in the other end of the sleeve of the mould sleeve; the outer wall of the plug corresponds to the inner wall of the mould sleeve; the core barrel abuts against the plug; one end of the mould core penetrates through the sleeve of the plug and extends into the sleeve of the mould sleeve, and the mould core can be extended and retracted; the nitrogen channel is arranged in the mould core, and the outlet of the nitrogen channel is arranged at the end of the mould core; the outer wall of the mould core corresponds to the inner wall of the positive mould to form a mould cavity; The mould core comprises a plurality of arrayed core rods; each core rod is provided with a nitrogen channel; The other end of the plurality of core rods is integrated; the gas inlet end of the nitrogen channel is arranged at the other end of the core rod and is branched to each core rod; The method comprises the following steps: S1: the core barrel pushes the plug into the other end of the sleeve of the mould sleeve; S2: the push rod pushes the positive mould, and the positive mould pushes the heated blank to move in the sleeve of the mould sleeve until the blank abuts against the plug; S3: the mould core penetrates through the plug until the end of the mould core is arranged in the sleeve of the positive mould, and the outer wall of the end of the mould core corresponds to the inner wall of the positive mould to form a mould cavity; meanwhile, nitrogen enters the nitrogen channel; S4: the push rod pushes the positive mould and extrudes the blank; during the extrusion of the blank by the positive mould, the mould core is retracted to maintain the shape of the mould cavity; meanwhile, nitrogen enters the hole of the formed aluminium alloy flat tube through the nitrogen channel; S5: the blank is extruded and formed, and the aluminium alloy flat tube is taken out and cut at both ends.

2. A porous aluminum alloy flat tube extrusion forming die according to claim 1, wherein The inner hole of the cross section of the mould sleeve is rectangular.

3. A die for extruding a porous aluminum alloy flat tube according to claim 2, wherein The outer wall of the positive mould is provided with a groove on each of the four surfaces.

4. The extrusion die for forming a porous aluminum alloy flat tube according to claim 1, wherein The inner hole of the cross section of the positive mould is a waist round hole.

5. The extrusion die for forming a porous aluminum alloy flat tube according to claim 1, wherein The core rod is five.

6. The extrusion die for forming a porous aluminum alloy flat tube according to claim 1, wherein The core barrel is a sleeve, and is sleeved on the mould core.

7. The extrusion die for forming a porous aluminum alloy flat tube according to claim 1, wherein Step S5 comprises the following steps: S5': the blank is extruded and formed, the core barrel and the mould core are retracted, the push rod continues to push the positive mould to move forward until the tail end of the blank is exposed from the mould sleeve; S5'': the tail end of the blank is cut, the puller pulls out the flat tube, and the head end of the flat tube is cut.

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