Magnesium alloy die capable of achieving high-speed extrusion

Abstract

The magnesium alloy die comprises a lower die, an upper die and a plurality of flow guide holes, the upper die is located over the lower die, a female die cavity is formed in the upper portion of a die body of the lower die, the flow guide holes are perpendicularly formed in the bottom of the inner wall of the female die cavity, and the flow guide holes are communicated with the female die cavity. When the male die enters the die cavity of the female die, the magnesium alloy plate can be impacted and extruded, meanwhile, before extrusion is about to be conducted every time, the air guide pipe can rapidly suck nitrogen in the nitrogen tank into the cavity under the action of the suction pump, due to the fact that the volume of the cavity is small, the nitrogen can rapidly flow into the die cavity of the female die through the flow guide hole under high air pressure, and therefore the magnesium alloy plate can be rapidly extruded. According to the method, the magnesium alloy plate is directly sprayed on the bent heating part of the magnesium alloy plate, so that the magnesium alloy plate is quickly cooled, the specific strength and the structure mechanical property of the magnesium alloy plate are indirectly improved, the high-temperature part of the material can be prevented from being oxidized under the protection of inert gas, and the surface quality of the magnesium alloy is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal processing dies, in particular to a magnesium alloy die capable of high-speed extrusion. Background Art

[0002] Since magnesium alloys have the characteristics of high strength and large elastic modulus, magnesium alloy profiles are generally difficult to shape. In industry, the processing of magnesium alloys generally uses forming dies and high-speed extrusion equipment to continuously shape them. Shaping usually adopts an extrusion method with excellent deformation mechanical conditions. In this extrusion forming method, the raw material (blank) placed in the container is forced through the die opening by a hammer, thereby producing a section or contour with a constant cross-section.

[0003] For magnesium alloys, in the high-speed extrusion process of magnesium alloys, the friction heat generated between the magnesium alloy material and the die is large and the temperature rises quickly. The higher temperature will reduce the specific strength and micromechanical properties of the material surface, which will in turn have an adverse effect on the high-speed extrusion process. The processing quality and efficiency need to be improved. In view of the above problems, we proposed a magnesium alloy die that can be extruded at high speed. Utility Model Content

[0004] The utility model aims to provide a magnesium alloy die capable of high-speed extrusion, so as to solve the problem that the existing magnesium alloy high-speed extrusion die device proposed in the above background technology is prone to high speed during processing and brings adverse effects to the high-speed extrusion process.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a magnesium alloy mold capable of high-speed extrusion, comprising a lower mold, an upper mold and a guide hole, wherein the upper mold is located directly above the lower mold, and the lower mold is fixed on a base, and the upper mold is connected to a hydraulic device, which pushes it vertically downward during operation, and a concave die groove is provided on the upper part of the mold body of the lower mold, and the guide hole is vertically opened at the bottom of the inner wall of the concave die groove, and a plurality of guide holes are provided, and a cavity connected to the guide hole is also provided inside the lower mold.

[0006] Preferably, the holes of the plurality of guide holes are all opened at the chamfered parts in the die groove of the female mold, the chamber is a horizontal cavity structure, and the height of the chamber is not less than 1.5 centimeters, and the bottom of the upper mold is also provided with a male mold matching the die groove.

[0007] Preferably, the bottom of the chamber is an open structure, and the inner side of the open structure is matched and covered with a sealing cover, and the sealing cover is fixedly connected to the lower mold by threads.

[0008] Preferably, a vertically penetrating air guide hole is provided on the cover body of the sealing cover, an air guide pipe connected to the air guide hole is provided at the bottom of the sealing cover, and a threaded sleeve is provided at the connection between the air guide pipe and the air guide hole.

[0009] Preferably, one end of the air guide pipe away from the air guide hole is connected to a nitrogen tank, and a suction pump and an electromagnetic switch valve are also provided on the pipe body of the air guide pipe, and the electromagnetic switch valve is located on the side of the air guide pipe close to the nitrogen tank.

[0010] Preferably, a void groove matching the sealing cover is provided at the bottom of the lower mold, and the void groove is communicated with the chamber after the sealing cover is removed.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the upper mold is driven down by a hydraulic device, and then the punch directly enters the die groove of the die, and rams and extrude the magnesium alloy plate in the die groove of the die; at the same time, before each extrusion, the air guide pipe can quickly draw nitrogen from the nitrogen tank into the chamber under the action of the suction pump; because the volume of the chamber is small, nitrogen can quickly flow into the die groove of the die through the guide hole under high pressure, and directly spray the bending and heating parts of the magnesium alloy plate to make it cool quickly, and at the same time indirectly improve the specific strength and micromechanical properties of the magnesium alloy plate; and, under the protection of the inert gas, it can also prevent the high-temperature parts of the material from being oxidized, thereby improving the surface quality of the magnesium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the external structure of the mold of the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the utility model as a whole;

[0014] Figure 3 This is a schematic diagram of the bottom of the lower mold of the utility model after installation;

[0015] Figure 4 This is a schematic diagram of the bottom of the lower mold of the utility model after disassembly.

[0016] In the figure: 1. lower mold; 11. concave mold groove; 12. air avoidance groove; 2. upper mold; 21. punch; 3. guide hole; 4. chamber; 5. sealing cover; 51. air guide hole; 52. threaded sleeve; 6. air guide tube; 7. nitrogen tank; 8. suction pump. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0018] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1-Figure 4 The schematic diagram of the whole structure of a magnesium alloy die capable of high-speed extrusion of the utility model is shown in FIG. Figure 1-Figure 4 A magnesium alloy mold capable of high-speed extrusion in this embodiment includes a lower mold 1, an upper mold 2 and a guide hole 3. The upper mold 2 is located directly above the lower mold 1, and the lower mold 1 is fixed on a base. The upper mold 2 is connected to a hydraulic device, and is pushed vertically downward by the hydraulic device during operation. A concave die groove 11 is provided on the upper part of the mold body of the lower mold 1, and the guide hole 3 is vertically opened at the bottom of the inner wall of the concave die groove 11, and a plurality of guide holes 3 are provided. A cavity 4 connected to the guide hole 3 is also provided inside the lower mold 1.

[0021] In the present embodiment, the holes of the plurality of guide holes 3 are all opened in the chamfered parts of the die groove 11, the chamber 4 is a horizontal cavity structure, and the height of the chamber 4 is not less than 1.5 centimeters. The bottom of the upper mold 2 is also provided with a punch 21 matching the die groove 11, and the bottom of the chamber 4 is an open structure. At the same time, the inner side of the open structure is matched and covered with a sealing cover 5, and the sealing cover 5 is fixedly connected to the lower mold 1 by threads.

[0022] The cover body of the sealing cover 5 is provided with a vertically penetrating air guide hole 51, and the bottom of the sealing cover 5 is provided with an air guide pipe 6 connected with the air guide hole 51. At the same time, a threaded sleeve 52 is provided at the connection between the air guide pipe 6 and the air guide hole 51. The end of the air guide pipe 6 away from the air guide hole 51 is connected with a nitrogen tank 7. The pipe body of the air guide pipe 6 is also provided with a suction pump 8 and an electromagnetic switch valve, and the electromagnetic switch valve is located on the air guide pipe 6 near the nitrogen tank 7. The hydraulic device drives the upper mold 2 to descend, and then the punch 21 directly enters the die groove 11 of the die, and the magnesium alloy in the die groove 11 is pressed. The plate is impacted and extruded. At the same time, before each extrusion, the air guide pipe 6 can quickly suck the nitrogen in the nitrogen tank 7 into the chamber 4 under the action of the suction pump 8. Since the volume of the chamber 4 is small, the nitrogen can quickly flow into the die groove 11 through the guide hole 3 under high pressure, and directly spray the bending and heating part of the magnesium alloy plate to make it quickly cool down, and at the same time indirectly improve the specific strength and organizational mechanical properties of the magnesium alloy plate. Moreover, under the protection of the inert gas, the high-temperature part of the material can be prevented from being oxidized, thereby improving the surface quality of the magnesium alloy.

[0023] Furthermore, a gas avoidance groove 12 matching the sealing cover 5 is provided at the bottom of the lower mold 1, and the gas avoidance groove 12 is connected with the chamber 4 after the sealing cover 5 is removed. The gas avoidance groove 12 can facilitate the disassembly and removal of the sealing cover 5, and after the sealing cover 5 is removed, a drilling device can be used to open a guide hole 3 from the inside to the outside, so that metal waste will not remain in the chamber 4. The structure is simple and easy to produce.

[0024] In summary, the present embodiment is a magnesium alloy mold capable of high-speed extrusion. First, the hydraulic device drives the upper mold 2 to descend, and then the punch 21 directly enters the die groove 11, and impacts and extrude the magnesium alloy plate in the die groove 11. At the same time, before each extrusion, the air duct 6 can quickly draw the nitrogen in the nitrogen tank 7 into the chamber 4 under the action of the suction pump 8. Since the volume of the chamber 4 is small, the nitrogen can quickly flow into the die groove 11 through the guide hole 3 under high pressure, and directly spray the bending and heating parts of the magnesium alloy plate to make it quickly cool down, and at the same time indirectly improve the specific strength and micromechanical properties of the magnesium alloy plate. Moreover, under the protection of the inert gas, the high-temperature parts of the material can be prevented from being oxidized, thereby improving the surface quality of the magnesium alloy.

[0025] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A magnesium alloy die capable of high-speed extrusion, characterized in that: The invention comprises a lower mold (1), an upper mold (2) and a guide hole (3), wherein the upper mold (2) is located directly above the lower mold (1), a concave mold groove (11) is provided on the upper part of the mold body of the lower mold (1), the guide hole (3) is vertically opened at the bottom of the inner wall of the concave mold groove (11), and a plurality of guide holes (3) are provided, and a cavity (4) connected to the guide hole (3) is also provided inside the lower mold (1).

2. A magnesium alloy die capable of high-speed extrusion according to claim 1, characterized in that: The holes of the plurality of guide holes (3) are all opened at the chamfered portion of the die groove (11); the chamber (4) is a horizontal cavity structure, and the height of the chamber (4) is not less than 1.5 centimeters; the bottom of the upper mold (2) is also provided with a convex mold (21) matching the die groove (11).

3. A magnesium alloy die capable of high-speed extrusion according to claim 2, characterized in that: The bottom of the chamber (4) is an open structure, and the inner side of the open structure is matched and covered with a sealing cover (5), and the sealing cover (5) is fixedly connected to the lower mold (1) by a thread.

4. A magnesium alloy die capable of high-speed extrusion according to claim 3, characterized in that: The cover body of the sealing cover (5) is provided with a vertically penetrating air guide hole (51), the bottom of the sealing cover (5) is provided with an air guide pipe (6) connected to the air guide hole (51), and a threaded sleeve (52) is provided at the connection between the air guide pipe (6) and the air guide hole (51).

5. The high-speed extrusion magnesium alloy die according to claim 4, characterized in that: One end of the air guide pipe (6) away from the air guide hole (51) is connected to a nitrogen tank (7), and a suction pump (8) and an electromagnetic switch valve are also provided on the pipe body of the air guide pipe (6), and the electromagnetic switch valve is located on the side of the air guide pipe (6) close to the nitrogen tank (7).

6. The high-speed extrusion magnesium alloy die according to claim 5, characterized in that: The bottom of the lower mold (1) is provided with an air-avoiding groove (12) matching the sealing cover (5), and after the sealing cover (5) is removed, the air-avoiding groove (12) is connected to the chamber (4).

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