Continuous extrusion die assembly for overcoming layering defect of end of aluminum bar

Abstract

According to the continuous extrusion die assembly for overcoming the layering defect of the end of the aluminum row, a blank tangentially enters a profiled groove of an extrusion wheel through the compaction effect of a compaction wheel and then enters a cavity of an extrusion shoe to be extruded, a die cavity is formed in the tail end of the cavity of the extrusion shoe, and a plug of the die cavity protrudes and is located at the tail end of the cavity of the extrusion shoe; the rear end of the plug portion is an inlet of the cavity portion, a die is connected behind the cavity portion, and a die cushion is connected behind the die. According to the utility model, the plug and the die cavity are integrally designed, so that aluminum adhesion can be prevented and disassembly and assembly are convenient; and meanwhile, the integrated design and the special mold cavity structure can reduce turbulent flow and turbulent flow of metal flow in the channel, so that the metal is uniformly filled into a mold working tape after entering the mold cavity, and an extruded product has no layering phenomenon.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material processing, in particular to a continuous extrusion die assembly for solving the stratification defect of aluminum bar ends. Background Art

[0002] Continuous extrusion is a metal forming technology also known as CONFORM extrusion. A continuous extruder consists of four main parts: an extrusion wheel with concave grooves machined into its rim, which is rotated by a drive shaft; an extrusion shoe, which is a fixed device. The part in contact with the extrusion wheel is an arched groove seal. The groove seal is generally at a 90-degree angle with the extrusion wheel, which serves to seal the concave grooves of the extrusion wheel and form a square extrusion cavity; a plug fixed to the outlet of the extrusion cavity, which seals the outlet of the extrusion cavity and forces the metal to flow only through the extrusion die; and an extrusion die, which is mounted on the plug for tangential extrusion or on the shoe for radial extrusion. When the extrusion billet is continuously fed from the inlet end of the extrusion cavity, due to the three forward-moving movable edges of the wheel, the wheel groove bites the billet under the action of friction and pulls the metal toward the die hole. When the clamping length is sufficient, the friction is sufficient to generate an extrusion stress of up to 1000 MPa near the die hole, forcing the metal to flow out of the die hole. Since the extrusion direction of the billet in the extrusion wheel is 90 degrees to the discharge direction of the die outlet, a die cavity is often set before the metal enters the die to accommodate the metal to be extruded to prevent the metal flow from suddenly changing its direction and causing fluid turbulence, which may cause defects such as delamination and cavities in the directly extruded product. The metal after pressure filling in the die cavity enters the die for extrusion, and the extruded product is uniform and well fused.

[0003] In ordinary continuous extrusion dies, conventional designs have the following disadvantages: 1. The plug is usually a separate component, and there is a seam between it and the die cavity. Aluminum is easily stuck at the seam, which makes it inconvenient to install and disassemble the components, and also causes unstable metal flow at the seam; 2. When the metal flow enters the die cavity, the ordinary die cavity channel has a straight wall, and the entry channel is equal to the die cavity diameter. The metal flow still has turbulence and turbulence in the die cavity. After the turbulent metal passes through the die cavity into the mold for extrusion, there are still defects such as mild stratification and poor welding. Especially in the initial stage of extrusion, the metal filling pressure in the die cavity is limited, so the turbulence phenomenon is still serious. In addition, the influence of the seam between the plug and the die cavity leads to stratification of the head of the backlog product, which is most obvious in the discharge of materials. Summary of the Invention

[0004] The purpose of the utility model is to provide a continuous extrusion die assembly that solves the stratification defect of the aluminum bar end. The plug and the die cavity are designed as an integrated whole, which can prevent aluminum from sticking and facilitate disassembly and assembly. At the same time, the integrated design and the special die cavity structure can reduce the turbulence and turbulence of the metal flow inside the channel, so that the metal is evenly filled in the die cavity, and the stratification phenomenon of the extruded product is greatly reduced.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0006] A continuous extrusion die assembly that solves the stratification defect of the aluminum bar end. The blank enters the groove of the extrusion wheel tangentially through the compaction action of the compacting wheel, and then enters the cavity of the extrusion shoe for extrusion. A die cavity is provided at the end of the extrusion shoe cavity. A plugging part of the die cavity protrudes and is located at the end of the extrusion shoe cavity. The rear end of the plugging part is the entrance of the cavity part. The cavity part is connected to the die, and the die is connected to the die pad.

[0007] An introduction plate is provided at the inlet of the extrusion shoe. The inlet edge of the introduction plate is arc-shaped, and the cross-sectional area at the inlet is larger than the cross-sectional area of the extrusion cavity of the extrusion shoe, which is conducive to the smooth introduction of the blank metal.

[0008] The cross-sectional area of the cavity channel is larger than the cross-sectional area of the inlet, and the central longitudinal section of the cavity channel is rectangular.

[0009] The inlet of the cavity portion is the inlet of the contraction channel.

[0010] The upper and lower walls of the contraction channel entrance are contraction slopes. The contraction-shaped entrance allows the metal flow pressure to accumulate before the die cavity entrance, reducing the flow speed of the metal flow at the bend, preventing turbulence, and facilitating uniform metal filling of the die cavity.

[0011] The inclination angles of the upper and lower walls of the shrinkage channel entrance are 20-45 degrees.

[0012] The front end of the die cavity plug is an inclined guide. This guide can be an inclined or curved surface, extending from the extrusion tangent point to the die position. Its purpose is to evenly guide the metal flow in the extrusion shoe cavity into the die cavity, achieving a 90-degree radial deflection of the metal and preventing turbulence caused by the 90-degree deflection of the metal at the contact point with the plug during the extrusion process.

[0013] A die pad is provided on the die outlet end face to provide die support and prevent the die from deformation and deflection due to extrusion.

[0014] The metal flow principle of this utility model is:

[0015] When the metal fluid reaches the end of the extrusion shoe cavity, the plug stops the metal from continuing to move tangentially, and instead turns 90 degrees to enter the mold cavity. The metal accumulates a certain pressure before entering the mold cavity entrance, and slowly and orderly enters the mold cavity along the contraction channel entrance, and then enters the mold for extrusion in an orderly manner, obtaining an extruded product with uniform metal and no stratification.

[0016] Compared with the traditional DC die cavity channel, the metal flow that moves forward quickly in the extrusion boot cavity collides with the metal flow that stops and turns quickly, causing turbulence. The turbulent and chaotic metal enters the die and the extruded product is severely stratified.

[0017] Advantages of utility models

[0018] 1. The integrated design of the plug and the mold cavity of the utility model can prevent aluminum from sticking at the joints, facilitate disassembly and assembly, and facilitate metal flow.

[0019] 2. The utility model has a closed-end mold cavity inlet, which can effectively reduce the flow speed of the metal flow at the bend, prevent turbulence, and obtain a uniform metal backlog product without stratification, thereby improving the product yield, especially for the improvement of the continuous extrusion head stratification of aluminum alloy strips.

[0020] 3. The utility model adds an inclined guide portion at the front end of the plug to further prevent the metal fluid from contacting the plug at 90 degrees and generating turbulence. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the working state structure of the extrusion die assembly of the utility model;

[0022] Figure 2 Schematic diagram of the cross section of the mold cavity component;

[0023] Figure 3 for Figure 2 Schematic diagram of the structure in the middle A direction;

[0024] The names of the components in the accompanying drawings are: 1-extrusion wheel; 2-blank; 3-compacting wheel; 4-introduction plate; 5-extrusion shoe; 6-mold cavity; 61-plug part; 62-cavity part; 7-mold; 8-mold pad. DETAILED DESCRIPTION Example 1

[0025] A continuous extrusion die assembly for solving the stratification defect of the end of an aluminum bar. The blank 2 is compacted by the compacting action of the compacting wheel 3, enters the groove of the extrusion wheel 1 tangentially, and then enters the cavity of the extrusion shoe 5 for extrusion. A die cavity 6 is provided at the end of the cavity of the extrusion shoe 5. A plugging portion 61 of the die cavity 6 protrudes and is located at the end of the cavity of the extrusion shoe 5. The rear end of the plugging portion 61 is the entrance of the cavity portion 62. The cavity portion 62 is connected to the die 7, and the die 7 is connected to the die pad 8.

[0026] An introduction plate 4 is provided at the inlet of the extrusion shoe 5 .

[0027] The cross-sectional area of the cavity portion 62 is larger than the cross-sectional area of the inlet, and the central longitudinal section of the cavity portion 62 is rectangular.

[0028] The entrance of the cavity portion 62 is the entrance of the contraction channel.

[0029] The upper and lower walls of the inlet of the contraction channel are contraction inclined surfaces.

[0030] The inclination angles of the upper and lower walls of the shrinkage channel entrance are 20-45 degrees.

[0031] The front end of the plugging portion 61 of the mold cavity 6 is an inclined flow guide portion 63 .

[0032] A die pad 8 is provided on the outlet end face of the die 7 .

Claims

1. A continuous extrusion die assembly for solving the stratification defect of aluminum bar ends, characterized in that: The blank (2) is compacted by the compacting wheel (3) and enters the groove of the extrusion wheel (1) tangentially, and then enters the cavity of the extrusion shoe (5) for extrusion. A mold cavity (6) is provided at the end of the cavity of the extrusion shoe (5). A plug (61) of the mold cavity (6) protrudes and is located at the end of the cavity of the extrusion shoe (5). The rear end of the plug (61) is the entrance of the cavity (62). The cavity (62) is connected to the mold (7), and the mold (7) is connected to the mold pad (8).

2. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 1 is characterized in that: An introduction plate (4) is provided at the inlet of the extrusion shoe (5).

3. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 1 is characterized in that: The cross-sectional area of the cavity portion (62) channel is larger than the cross-sectional area of the inlet, and the central longitudinal section of the cavity portion (62) channel is rectangular.

4. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 3 is characterized in that: The inlet of the cavity portion (62) is the inlet of the contraction channel.

5. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 4 is characterized in that: The upper and lower walls of the inlet of the contraction channel are contraction inclined surfaces.

6. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 4, characterized in that: The inclination angles of the upper and lower walls of the shrinkage channel entrance are 20-45 degrees.

7. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 1, characterized in that: The front end of the plugging portion (61) of the mold cavity (6) is an inclined flow guide portion (63).

8. The continuous extrusion die assembly for solving the stratification defect of aluminum bar ends according to claim 1, characterized in that: A die pad (8) is provided on the outlet end face of the die (7).

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