Large-rod-diameter magnesium alloy semi-continuous casting device

Abstract

The utility model discloses a large-rod-diameter magnesium alloy semi-continuous casting device, and belongs to the technical field of magnesium alloy casting. Comprising a crystallizing device and a shunting disc, wherein the crystallizing device comprises a crystallizing disc in the center and a crystallizer arranged on the outer edge of the crystallizing disc; the shunting disc is arranged right above the crystallization disc, the shunting disc is provided with a cavity, a conical flow guide block is arranged in the cavity, a plurality of flow guide holes are uniformly distributed in the edge of the shunting disc, and magnesium alloy liquid is guided to flow to the edge of the crystallization disc along the flow guide holes; the flow guide hole is communicated with the cavity, and the cavity is connected with a liquid guide pipe; according to the utility model, the whole magnesium alloy rod body is uniformly cooled and shrunk, so that the generation of hot cracks is effectively reduced, and the problem of edge cracks of the large-diameter magnesium alloy rod body is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnesium alloy casting, in particular to a semi-continuous casting device for large-rod diameter magnesium alloy. Background Art

[0002] At present, magnesium alloy forming is mainly divided into two categories: casting and deformation. Deformed magnesium alloys have excellent mechanical properties and a wider range of application prospects. Deformed magnesium alloys are mainly prepared by semi-continuous casting, followed by extrusion, rolling, forging and other methods. They are widely used in military industry, high-speed rail, aerospace, 3C and other fields. Magnesium-zinc magnesium alloys have excellent performance after deformation, high strength and high elongation such as ZK, ZE and other magnesium alloys, but for large rod diameter magnesium alloys, there are problems of easy cracking and more edge defects during casting. The main reasons are:

[0003] 1. The cooling rate difference between the edge and the middle of the large diameter rod-shaped magnesium alloy during casting is quite large;

[0004] 2. Magnesium alloy castings with large diameter rod shape have problems such as difficulty for magnesium liquid to flow to the edge, which easily leads to cold shut. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a semi-continuous casting device for large-diameter magnesium alloy bars, thereby solving the problem that the edges of large-diameter magnesium alloy bars are prone to cracking and have many defects.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0007] A semi-continuous casting device for a large-rod-diameter magnesium alloy comprises a crystallization device and a diverter plate, wherein the crystallization device comprises a central crystallization plate and a crystallizer arranged at the outer edge of the crystallization plate; the diverter plate is arranged directly above the crystallization plate, the diverter plate is provided with a cavity, a conical guide block is arranged in the cavity, a plurality of guide holes are evenly distributed on the edge of the diverter plate, and the magnesium alloy liquid is guided to flow along the guide holes to the edge of the crystallization plate; the guide holes are connected to the cavity, and the cavity is connected to a liquid guide tube.

[0008] Furthermore, the diverter plate is a fan-shaped structure, and multiple diverter plates are evenly distributed in a ring above the crystallization plate; the liquid guide tube is connected to multiple diverter tubes, the diverter tubes correspond to the diverter plates one by one, and the liquid outlets of the diverter tubes extend into the cavity.

[0009] Furthermore, the liquid outlet of the diverter pipe is located directly above the conical guide block.

[0010] Furthermore, a plurality of temperature measuring points are arranged above the diverter plate.

[0011] Furthermore, the crystallization disk is circular, and the temperature measuring points are distributed directly above the center of the crystallization disk, directly above 1 / 2 of the radius of the crystallization disk, and directly above the edge of the crystallization disk.

[0012] Furthermore, the diverter plate is placed on a support, and the support is located above the crystallization plate.

[0013] The beneficial effects of the utility model compared with the prior art are:

[0014] The utility model transfers the magnesium liquid to the diversion device for diversion through the liquid guide tube. Since the flow rate of the diversion tube is uneven, the liquid flow rate is regulated by the conical device in the diversion plate to make the magnesium liquid diversion uniform. The diversion plate has small holes on the outside and no holes on the inside. The magnesium alloy liquid first flows to the outer edge and then flows back to the middle, which plays two roles:

[0015] 1. High-temperature magnesium liquid has good fluidity and can be spread to the edge of the crystallizer to reduce the cold shut at the edge.

[0016] 2. When the magnesium liquid flows back from the edge to the middle, the temperature will be greatly reduced, making the temperature difference between the edge and the center uniform, which can make the overall cooling and shrinkage of the magnesium alloy rod uniform, effectively reducing the occurrence of thermal cracking. It can well solve the edge cracking problem of easy-to-crack magnesium alloys and increase the casting yield of easy-to-crack magnesium alloys by 10~20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side perspective view of the semi-continuous casting device for large-diameter magnesium alloy rods of the utility model;

[0018] Figure 2 It is a top view of the diverter plate;

[0019] Figure 3 It is a top view of a semi-continuous casting device for large-diameter magnesium alloy rods;

[0020] Figure 4 It is a side view of a semi-continuous casting device for large-diameter magnesium alloy rods;

[0021] In the figure: 1. diverter plate; 2. crystallization plate; 3. crystallizer; 4. cavity; 5. conical guide block; 6. guide hole; 7. guide pipe; 8. diverter pipe; 9. temperature measuring point; 10. bracket. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0023] See also Figures 1 to 4The utility model discloses a semi-continuous casting device for large-rod magnesium alloy, including a crystallization device and a diverter plate 1. The crystallization device includes a central crystallization plate 2 and a crystallizer 3 arranged on the outer edge of the crystallization plate 2; the crystallizer 3 is an existing device, which is used to cool the magnesium alloy liquid. The diverter plate 1 is arranged directly above the crystallization plate 2, and the diverter plate 1 is provided with a cavity 4, and a conical guide block 5 is arranged in the cavity 4. The function of the conical guide block 5 is to regulate the flow rate of the magnesium alloy liquid so that the magnesium alloy liquid is diverted more evenly. A plurality of guide holes 6 are evenly distributed on the edge of the diverter plate 1, which are used to guide the magnesium alloy liquid to flow along the guide holes 6 to the edge of the crystallization plate 2; the guide holes 6 are connected to the cavity 4.

[0024] The present embodiment provides a structure of a diverter plate 1: the diverter plate 1 is fan-shaped, and three diverter plates 1 form a ring evenly distributed directly above the crystallization plate 2; the liquid guide tube 7 is used to transport the magnesium alloy liquid, and the diverter tube 7 is connected to three diverter tubes 8, and the diverter tubes 8 correspond to the diverter plates 1 one by one, and the liquid outlet of the diverter tube 8 extends into the cavity 4, and the liquid outlet of the diverter tube 8 is located directly above the conical guide block 5.

[0025] In this embodiment, the crystallization disk 2 is circular, and three temperature measuring points 9 are arranged above the diverter disk 1. The temperature measuring points 9 are distributed directly above the center of the crystallization disk 2, directly above the 1 / 2 radius of the crystallization disk 2, and directly above the edge of the crystallization disk 2.

[0026] A further structural improvement is to place the diverter plate 1 on a support 10 , and the support 10 is located above the crystallization plate 2 .

[0027] The working principle of this device is:

[0028] The temperature of the magnesium alloy solution refined in the refining pot is controlled to a reasonable temperature range, and low-pressure liquid transfer is achieved through argon gas, and the solution is transferred to the diversion plate 1 through the liquid guide pipe 7 for diversion. Specifically:

[0029] The magnesium alloy liquid in the liquid guide tube 7 enters the cavity 4 of the diverter plate 1 through the three diverter tubes 8, and flows directly down through the conical guide block 5. The flow rate of the magnesium alloy liquid is controlled by the conical guide block 5 in the diverter plate 1, and the magnesium alloy liquid in the three diverter plates 1 is made more uniform. The diverter plate 1 adopts a fan-shaped design to make the outflowing magnesium alloy liquid more uniform and flow evenly to the edge of the crystallizer 3 through the guide holes 6 of the diverter plate 1.

[0030] The magnesium alloy liquid first flows to the outer edge of the crystallization disk 2 for cooling, and then flows back to the middle of the crystallization disk 2. Due to the good fluidity of the high-temperature magnesium liquid, it can be well spread to the edge of the crystallizer, reducing the cold shut at the edge. The magnesium alloy liquid flows back from the edge of the crystallization disk 2 to the middle, and the temperature will be greatly reduced, so that the temperature difference between the edge and the center tends to be uniform, which can make the overall cooling and shrinkage of the magnesium alloy rod uniform, effectively reducing the occurrence of hot cracking. It can well solve the problem of edge cracking of easy-to-crack magnesium alloys and increase the casting yield of easy-to-crack magnesium alloys by 10~20%.

[0031] In this embodiment, there are three temperature measuring points 9, which can fully detect the temperature values ​​of various key positions, and can perform comprehensive control by controlling the flow rate of the magnesium alloy liquid, the water flow rate in the crystallizer 3, electromagnetic stirring, etc., so as to control the magnesium alloy liquid in the crystallization device within a reasonable range.

[0032] When the crack-prone magnesium alloy cast rods pass through this device, the edge cracks of the large-diameter crack-prone magnesium alloy rods almost disappear, and the grains are relatively uniform. Compared with the ordinary semi-continuous casting method, the scrap rate is reduced by 20% and the grain uniformity is doubled.

[0033] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A semi-continuous casting device for large-diameter magnesium alloy bars, characterized in that: The invention comprises a crystallization device and a diverter plate (1), wherein the crystallization device comprises a central crystallization plate (2) and a crystallizer (3) arranged at the outer edge of the crystallization plate (2); the diverter plate (1) is arranged directly above the crystallization plate (2); the diverter plate (1) is provided with a cavity (4); a conical guide block (5) is arranged in the cavity (4); a plurality of guide holes (6) are evenly distributed on the edge of the diverter plate (1) to guide the magnesium alloy liquid to flow along the guide holes (6) to the edge of the crystallization plate (2); the guide holes (6) are connected to the cavity (4); and the cavity (4) is connected to a liquid guide tube (7).

2. The large-diameter magnesium alloy semi-continuous casting device according to claim 1 is characterized in that: The diverter plate (1) is a fan-shaped structure, and a plurality of diverter plates (1) are evenly distributed in a ring shape directly above the crystallization plate (2); the liquid guide tube (7) is connected to a plurality of diverter tubes (8), the diverter tubes (8) correspond one to one with the diverter plates (1), and the liquid outlets of the diverter tubes (8) extend into the cavity (4).

3. The large-diameter magnesium alloy semi-continuous casting device according to claim 2 is characterized in that: The liquid outlet of the diverter pipe (8) is located directly above the conical guide block (5).

4. The large-diameter magnesium alloy semi-continuous casting device according to claim 1 is characterized in that: A plurality of temperature measuring points (9) are arranged above the diverter plate (1).

5. The large-diameter magnesium alloy semi-continuous casting device according to claim 4 is characterized in that: The crystallization disk (2) is circular, and the temperature measurement points (9) are distributed directly above the center of the crystallization disk (2), directly above 1 / 2 of the radius of the crystallization disk (2), and directly above the edge of the crystallization disk (2).

6. The large-diameter magnesium alloy semi-continuous casting device according to claim 1, characterized in that: The diverter plate (1) is placed on a support (10), and the support (10) is located above the crystallization plate (2).

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