Extrusion device for testing corrosion resistance of magnesium alloy

Abstract

This invention relates to an extrusion device for testing the corrosion resistance of magnesium alloys. It includes an extrusion die with a constant-diameter extrusion cavity. The bottom of the constant-diameter extrusion cavity is connected to an expanded demolding hole, which is a frustum-shaped structure, narrower at the top and wider at the bottom. A material injection cylinder is located at the top of the extrusion die, with an injection channel between the injection cylinder and the upper end of the inner wall of the constant-diameter extrusion cavity. An extrusion column is located directly above the constant-diameter extrusion cavity, with an extrusion cylinder connected to the top of the column. A support base is located at the bottom of the extrusion die, with a support column adapted to the constant-diameter extrusion cavity at the top of the base. A connecting seat adapted to the expanded demolding hole is located between the support column and the support base. A lifting cylinder is connected to the bottom of the support base. The expanded demolding hole at the bottom of the constant-diameter extrusion cavity reduces friction between the sidewall and the product, facilitating smoother demolding under the action of the extrusion column.

Description

Technical Field

[0001] This utility model relates to the technical field of extrusion devices, and in particular to an extrusion device for testing the corrosion resistance of magnesium alloys. Background Technology

[0002] Magnesium alloys, as the lightest engineering structural materials, can effectively meet weight reduction requirements and have great application potential in fields such as the automotive industry. Die casting is currently one of the main forming methods for magnesium alloy products. During the casting process, magnesium alloys may develop defects such as compositional segregation and coarse grain size, leading to reduced corrosion resistance and making them unsuitable for applications requiring high performance. Therefore, improving the corrosion resistance of magnesium alloys has become a research hotspot in the field. Magnesium alloys have poor deformability at room temperature, but when heated above 200℃, the number of slip systems increases, improving plastic deformation capacity. The corrosion resistance of magnesium alloys is related to the second phase; the finer the particles in the second phase, the better the corrosion resistance of the alloy.

[0003] Corrosion resistance testing of magnesium alloys requires testing both solution-treated and extruded products. Therefore, the solution-treated magnesium alloy needs to be extruded to obtain the extruded form. Existing extrusion equipment makes demolding after extrusion molding difficult, affecting the extrusion operation. Utility Model Content

[0004] The present invention aims to address the shortcomings of the prior art by providing an extrusion device for testing the corrosion resistance of magnesium alloys.

[0005] To achieve the above objectives, this utility model adopts the following technical solution:

[0006] An extrusion device for testing the corrosion resistance of magnesium alloys includes an extrusion die, an equal-diameter extrusion cavity within the extrusion die, an expanded demolding hole at the bottom of the equal-diameter extrusion cavity, the expanded demolding hole being a frustum-shaped structure narrower at the top and wider at the bottom, an injection cylinder at the top of the extrusion die, an injection channel between the injection cylinder and the upper end of the inner wall of the equal-diameter extrusion cavity, an extrusion column directly above the equal-diameter extrusion cavity, an extrusion cylinder connected to the top of the extrusion column, a support base at the bottom of the extrusion die, a support column adapted to the equal-diameter extrusion cavity at the top of the support base, a connecting seat adapted to the expanded demolding hole between the support column and the support base, and a lifting cylinder connected to the bottom of the support base.

[0007] A heating coil is wound around the outside of the equal-diameter extrusion cavity inside the extrusion die, and the heating coil is connected to a temperature controller.

[0008] The top of the support column is provided with an installation groove and a temperature sensor is installed in the installation groove. A heat-conducting support plate is welded to the top of the support column. The temperature sensor detection probe is in contact with the heat-conducting support plate. The temperature sensor is connected to the temperature controller.

[0009] The beneficial effects of this utility model are: the extended demolding hole at the bottom of the equal diameter extrusion cavity of this utility model reduces the friction between the side wall and the product, which is more conducive to the product being demolded more smoothly under the action of the extrusion column. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the extrusion column performing the extrusion operation in this utility model;

[0011] Figure 2 This is a schematic diagram showing the extrusion column, support base, and extrusion die separated in this utility model;

[0012] In the diagram: 1-Extrusion die; 2-Equal diameter extrusion cavity; 3-Expanded demolding hole; 4-Injection cylinder; 5-Injection channel; 6-Extrusion column; 7-Extrusion cylinder; 8-Support base; 9-Support column; 10-Connecting seat; 11-Lifting cylinder; 12-Heating coil; 13-Temperature controller; 14-Temperature sensor; 15-Heat-conducting support plate; 16-Guide column; 17-Guide hole; 18-Fixing plate;

[0013] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0014] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0015] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] like Figures 1 to 2 As shown, an extrusion device for testing the corrosion resistance of magnesium alloys includes an extrusion die 1, an equal-diameter extrusion chamber 2, an expanded demolding hole 3, an injection cylinder 4, an injection channel 5, an extrusion column 6, an extrusion cylinder 7, a support base 8, a support column 9, a connecting seat 10, a lifting cylinder 11, a heating coil 12, a temperature controller 13, a temperature sensor 14, a heat-conducting support plate 15, a guide column 16, a guide hole 17, and a fixing plate 18.

[0019] The extrusion die 1 is provided with an equal-diameter extrusion cavity 2. The bottom of the equal-diameter extrusion cavity 2 is connected to an expanded demolding hole 3. The expanded demolding hole 3 is a frustum-shaped structure that is narrow at the top and wide at the bottom. The top of the extrusion die 1 is provided with an injection cylinder 4. An injection channel 5 is provided between the injection cylinder 4 and the upper end of the inner wall of the equal-diameter extrusion cavity 2. An extrusion column 6 is provided directly above the equal-diameter extrusion cavity 2. An extrusion cylinder 7 is connected to the top of the extrusion column 6. The bottom of the extrusion die 1 is provided with a support base 8. The top of the support base 8 is provided with a support column 9 that is adapted to the equal-diameter extrusion cavity 2. A connecting seat 10 that is adapted to the expanded demolding hole 3 is provided between the support column 9 and the support base 8. A lifting cylinder 11 is connected to the bottom of the support base 8.

[0020] A heating coil 12 is wound around the outside of the equal-diameter extrusion chamber 2 inside the extrusion die 1, and the heating coil 12 is connected to a temperature controller 13.

[0021] The top of the support column 9 is provided with an installation groove and a temperature sensor 14 is installed in the installation groove. A heat-conducting support plate 15 is welded to the top of the support column 9. The detection probe of the temperature sensor 14 is in contact with the heat-conducting support plate 15. The temperature sensor 14 is connected to the temperature controller 13.

[0022] The support base 8 is provided with guide posts 16, and the bottom of the extrusion die 1 is provided with guide holes 17 corresponding to the guide posts 16.

[0023] A fixing plate 18 is attached to the side wall of the extrusion die 1 and connected to the equipment.

[0024] When this utility model is in operation, the support base 8, support column 9, and connecting seat 10 rise and dock with the extrusion mold 1. The support column 9 extends into the equal diameter extrusion chamber 2, and the solid solution magnesium alloy is injected into the equal diameter extrusion chamber 2 from the injection cylinder 4 through the injection channel 5. The heating coil 12 heats the temperature at 220°C for preheating. The temperature control is achieved by interlocking the temperature sensor 14 and the temperature controller 13. Then, the extrusion column 6 begins the extrusion operation. After the extrusion is completed, the support base 8, support column 9, and connecting seat 10 descend, and the extrusion column 6 continues to press down to demold the product.

[0025] The extended demolding hole 3 at the bottom of the equal diameter extrusion cavity 2 of this utility model reduces the friction between the side wall and the product, which is more conducive to the product being demolded more smoothly under the action of the extrusion column 6.

[0026] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An extrusion device for corrosion resistance testing of a magnesium alloy, characterized by comprising: The extrusion die (1) includes an equal-diameter extrusion cavity (2) inside the extrusion die (1). The bottom of the equal-diameter extrusion cavity (2) is connected to an expanded demolding hole (3). The expanded demolding hole (3) is a frustum-shaped structure that is narrow at the top and wide at the bottom. The top of the extrusion die (1) is provided with an injection cylinder (4). An injection channel (5) is provided between the injection cylinder (4) and the upper end of the inner wall of the equal-diameter extrusion cavity (2). An extrusion column (6) is provided directly above the equal-diameter extrusion cavity (2). An extrusion cylinder (7) is connected to the top of the extrusion column (6). The bottom of the extrusion die (1) is provided with a support base (8). The top of the support base (8) is provided with a support column (9) that is adapted to the equal-diameter extrusion cavity (2). A connecting seat (10) that is adapted to the expanded demolding hole (3) is provided between the support column (9) and the support base (8). A lifting cylinder (11) is connected to the bottom of the support base (8).

2. The extrusion device for corrosion resistance testing of magnesium alloys according to claim 1, characterized in that The extrusion die (1) has a heating coil (12) wound around the equal-diameter extrusion cavity (2) inside, and the heating coil (12) is connected to a temperature controller (13).

3. The extrusion device for corrosion resistance testing of magnesium alloys according to claim 2, characterized in that The top of the support column (9) is provided with an installation groove and a temperature sensor (14) is provided in the installation groove. A heat-conducting support plate (15) is welded to the top of the support column (9). The detection probe of the temperature sensor (14) is set in contact with the heat-conducting support plate (15). The temperature sensor (14) is connected to the temperature controller (13).

4. The extrusion device for corrosion resistance testing of magnesium alloys according to claim 3, characterized in that The support base (8) is provided with guide posts (16), and the bottom of the extrusion die (1) is provided with guide holes (17) corresponding to the guide posts (16).

5. The extrusion device for corrosion resistance testing of magnesium alloys according to claim 4, characterized in that The fixing plate (18) on the side wall of the extrusion die (1) is connected to the equipment.

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