A rapid cooling roller for rapid solidification of magnesium alloy

Abstract

The invention discloses a quenching roller for rapid solidification of magnesium alloys, and belongs to the technical field of magnesium alloy preparation. Compared with the traditional copper roller and molybdenum roller for rapid solidification, the quenching roller for rapid solidification of magnesium alloys provided by the invention is made of relatively cheap industrial pure iron, has a high melting point, does not react with magnesium and its alloy elements, has good processing performance, can be used in industrial production on a large scale, and greatly reduces costs.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy preparation, and in particular to a rapid cooling roller used for rapid solidification of magnesium alloy. Background Art

[0002] Due to the depletion of energy and the increasing pressure of environmental protection, the world has put forward urgent requirements for lightweighting. Magnesium alloys are known as "green engineering materials" and "era metals" of the 21st century for their excellent thermal conductivity, recyclability, anti-electromagnetic interference and excellent damping performance. In addition, magnesium resources are very abundant. They have broad application prospects in the automotive industry, rail transportation, aerospace, robotics, household appliances, leisure and entertainment, etc. However, due to its poor mechanical properties and low yield strength, its application has been limited and has not been developed on a large scale like steel and aluminum alloys. Rapid solidification is the most effective way to improve the mechanical properties of magnesium alloys. The yield strength of magnesium alloys can be greatly improved through the principles of solid solution strengthening and fine grain strengthening, making it even higher than general steel and aluminum alloy materials.

[0003] Traditionally, the rollers used for rapid quenching of magnesium alloys are mostly copper rollers and molybdenum rollers with good thermal conductivity. However, since copper and molybdenum are relatively expensive, if they are used to prepare rollers with wide working surfaces that can be used for large-scale production, the cost is high, which is not conducive to large-scale application in industrial production. In addition, the melting point of copper is relatively low, and there is a chemical reaction between magnesium and copper. When copper rollers are used for rapid quenching of magnesium alloys, impurities such as Cu are easily introduced, thereby affecting the comprehensive properties of magnesium alloys. Therefore, it is necessary to find a low-cost material that can be used for rapid solidification of magnesium alloys to prepare quenching rollers, and it should have a simple structural design to facilitate manufacturing and processing. Summary of the invention

[0004] The purpose of the present invention is to provide a quenching roller for rapid solidification of magnesium alloys, so as to solve the problems of high cost of quenching rollers and inability to achieve large-scale rapid production in the existing rapid solidification preparation of magnesium alloys.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The utility model relates to a quenching roller used for rapid solidification of magnesium alloy, wherein the roller wheel of the quenching roller is an iron roller wheel.

[0007] Furthermore, in a preferred embodiment of the present invention, the above-mentioned quenching roller includes: a roller shaft, an iron roller mounted on the roller shaft, and a water inlet sleeve and a drainage sleeve respectively located on both sides of the iron roller and mounted on the roller shaft; the roller shaft, the iron roller, the water inlet sleeve and the drainage sleeve are all hollow structures, and the interior of the roller shaft is respectively connected to the interior of the iron roller, the water inlet sleeve and the drainage sleeve.

[0008] Furthermore, in a preferred embodiment of the present invention, the interior of the above-mentioned iron roller is divided into a cooling chamber and a reflux chamber by a water retaining baffle, and a water hole connecting the cooling chamber and the reflux chamber is provided on the water retaining baffle; a water inlet channel and a water outlet channel separated by an axial water retaining layer are provided in the roller shaft along its axial direction, the water inlet channel is provided with a water inlet shaft hole connected to the interior of the water inlet sleeve and a water outlet shaft hole connected to the cooling chamber, the water outlet channel is provided with a reflux shaft hole connected to the reflux chamber and a drainage shaft hole connected to the interior of the drainage sleeve; the water inlet sleeve is provided with a water inlet, and the drainage sleeve is provided with a drainage outlet.

[0009] Furthermore, in a preferred embodiment of the present invention, the number of the water inlet shaft hole, the water outlet shaft hole, the return shaft hole and the drainage shaft hole is at least two respectively, and they are evenly distributed along the circumference of the roller shaft.

[0010] Furthermore, in a preferred embodiment of the present invention, the above-mentioned water outlet shaft holes have multiple groups and are distributed on the roller shaft at non-equidistant intervals, and in the direction close to the axial water retaining layer, the distance between two adjacent groups of water outlet shaft holes gradually decreases.

[0011] Furthermore, in a preferred embodiment of the present invention, a plurality of heat dissipation fins extending radially thereof are provided on the inner wall of the iron roller, and one end of the heat dissipation fin away from the inner wall of the iron roller is separated from the roller shaft, and a fin hole is provided on one end of the heat dissipation fin close to the inner wall of the iron roller, so that the cavities formed between the plurality of heat dissipation fins are connected.

[0012] Furthermore, in a preferred embodiment of the present invention, the cavity between the heat dissipation fin and the iron roller and the cavity between two adjacent heat dissipation fins correspond to the water outlet shaft hole.

[0013] Furthermore, in a preferred embodiment of the present invention, dynamic seals are respectively provided between the iron roller, the water inlet sleeve, the water outlet sleeve and the roller shaft.

[0014] Furthermore, in a preferred embodiment of the present invention, the iron roller is made of industrial pure iron.

[0015] The present invention has the following beneficial effects:

[0016] The present invention uses an iron roller to replace the expensive copper roller and molybdenum roller for preparing a rapidly solidified magnesium alloy, which greatly saves the equipment investment cost. The preparation of large-scale rollers with a wide working surface for large-scale production will not generate huge equipment investment costs, and can be used on a large scale in industrial production. The present invention uses an iron roller to replace a copper roller. Another advantage is that the melting point of copper (1083.4°C) is not much higher than the melting point of magnesium (650°C), and copper and magnesium are easy to react. When the copper roller is used for rapid solidification of the magnesium alloy, it is easy to introduce impurities Cu, which affects the comprehensive properties of the magnesium alloy; the present application uses an iron roller for rapid solidification of the magnesium alloy, and its melting point (1538°C) is relatively high compared to magnesium. It is very important that there is no chemical reaction between magnesium and iron, and the strength is higher than that of copper, the processing performance is good, and the thermal conductivity (about 72W / (m·K)) is only slightly lower than that of brass (about 92W / (m·K)). It can save costs and improve the purity of the magnesium alloy and reduce the introduction of impurities on the premise of meeting good thermal conductivity.

[0017] In order to further improve the cooling effect of the quenching roller of the present invention, the present invention also provides a water cooling system matched with the iron roller, by setting a water inlet shaft hole, a water outlet shaft hole, a reflux shaft hole and a drainage shaft hole on the roller shaft to control the flow direction of cooling water inside the iron roller, thereby achieving a better cooling effect. Through the structural design of the iron roller and the inside of the roller shaft, the quenching roller of the present invention has a good cooling effect, and the structural design is simple, convenient for manufacturing and processing, low cost, and the roller width can be designed according to needs, and large-size quenching rollers can be prepared, thereby improving the production efficiency of magnesium alloy rapid quenching.

[0018] The present invention sets a water retaining baffle inside the iron roller to divide the inside of the iron roller into a cooling chamber and a reflux chamber, and also divides the roller shaft into a water inlet channel and a water outlet channel through an axial water retaining layer. Due to the existence of the axial water retaining layer, the cooling water is forced to flow into the cooling chamber inside the iron roller through the water inlet shaft hole for heat exchange, rather than flowing out directly from the roller shaft. In order to make the roller cooling degree uniform, the water outlet shaft holes set on the roller shaft of the present invention are non-equidistantly arranged, and the closer to the axial water retaining layer, the shorter the distance between the water outlet shaft holes. This is because the water that initially flows into the roller carries heat and flows toward the roller water through hole. The subsequent axial water outlet holes are designed to be more and more dense, in order to increase the water intake to reduce the temperature of the water flowing through, thereby achieving a better cooling effect on the roller and making the temperature more uniform. The number of openings can be designed according to the width of the roller. In order to achieve a better cooling effect, the cooling water must flow through the inner wall of the iron roller, so the present invention sets the water through hole on the water retaining baffle close to the inner wall of the iron roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of the structure of the quenching roller of the embodiment of the present invention, the arrows shown in the figure indicate the flow direction of the cooling medium;

[0020] Figure 2 It is a cross-sectional view of the chill roll along AA according to an embodiment of the present invention.

[0021] In the figure: 100-quenching roller; 10-iron roller; 101-water retaining baffle; 102-cooling chamber; 103-reflux chamber; 104-water hole; 20-roller shaft; 201-water inlet channel; 202-water outlet channel; 203-water inlet shaft hole; 204-reflux shaft hole; 205-drainage shaft hole; 206-water outlet shaft hole; 207-axial water retaining layer; 30-water inlet sleeve; 301-water inlet; 40-drainage sleeve; 401-drainage outlet; 50-dynamic seal. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example

[0024] Please refer to Figure 1 , a quenching roller 100 for rapid solidification of magnesium alloy, wherein the roller of the quenching roller 100 is an iron roller 10. The iron roller 10 is made of industrial pure iron. Figure 1 As shown, the chill roller 100 of the embodiment of the present invention comprises: a roller shaft 20, an iron roller 10 mounted on the roller shaft 20, and a water inlet sleeve 30 and a water discharge sleeve 40 respectively located on both sides of the iron roller 10 and mounted on the roller shaft 20. The roller shaft 20, the iron roller 10, the water inlet sleeve 30 and the water discharge sleeve 40 are all hollow structures. The interior of the roller shaft 20 is respectively connected to the interior of the iron roller 10, the water inlet sleeve 30 and the water discharge sleeve 40.

[0025] Please refer to Figure 1 , the inside of the iron roller 10 is divided into a cooling chamber 102 and a reflux chamber 103 by a water retaining baffle 101. The water retaining baffle 101 is arranged in a direction perpendicular to the axial direction of the iron roller 10, and the inside of the iron roller 10 is divided into two chambers along the axial direction: a cooling chamber 102 and a reflux chamber 103. The water retaining baffle 101 matches the cross-sectional shape of the iron roller 10, and its edge is connected to the inner wall of the iron roller 10. Preferably, the water retaining baffle 101 is a circular baffle, and the water retaining baffle 101 and the iron roller 10 are integrally formed. The volume occupied by the cooling chamber 102 is significantly larger than the reflux chamber 103, which is conducive to concentrating more cooling medium in the cooling chamber 102 and improving the cooling effect. Moreover, under the action of the water retaining baffle 101, the cooling medium must fill the entire cooling chamber 102 before it can flow into the reflux chamber 103 through the water through hole 104 on the baffle, and then flow out. It avoids direct outflow of cooling medium, prolongs the flow path of cooling medium, makes cooling more uniform and has better cooling effect. Figure 2The water hole 104 on the water retaining baffle 101 connecting the cooling chamber 102 and the reflux chamber 103 is arranged close to the inner wall of the iron roller 10, so that the cooling water flows into the reflux chamber 103 along the inner wall of the iron roller 10, so as to better take away the heat on the wall of the iron roller 10 and achieve a good cooling effect.

[0026] Please refer to Figure 1 , the roller shaft 20 is provided with an inlet channel 201 and an outlet channel 202 separated by an axial water retaining layer 207 along its axial direction. The inlet channel 201 is provided with an inlet shaft hole 203 connected to the inside of the water inlet sleeve 30 and an outlet shaft hole 206 connected to the cooling chamber 102. The outlet channel 202 is provided with a reflux shaft hole 204 connected to the reflux chamber 103 and a drainage shaft hole 205 connected to the inside of the drainage sleeve 40. There are at least two inlet shaft holes 203, outlet shaft holes 206, reflux shaft holes 204 and drainage shaft holes 205, which are evenly distributed along the circumference of the roller shaft 20. There are multiple groups of water outlet shaft holes 206, which are distributed on the roller shaft 20 at non-equidistant intervals. The number of each group of water outlet shaft holes 206 is at least two, and they are evenly distributed in the same circumferential direction of the roller shaft 20. As Figure 1 As shown, in the direction close to the axial water retaining layer 207, the distance between two adjacent groups of water outlet shaft holes 206 decreases. That is, the closer to the axial water retaining layer 207, the smaller the spacing between two adjacent groups of water outlet shaft holes 206. The inner wall of the iron roller 10 is provided with a plurality of heat dissipation fins 60 extending along its radial direction, and the end of the heat dissipation fin 60 away from the inner wall of the iron roller 10 is separated from the roller shaft 20, and the end of the heat dissipation fin 60 close to the inner wall of the iron roller 10 is provided with a fin hole 601, so that the cavity formed between the plurality of heat dissipation fins is connected. The cavity between the heat dissipation fin 60 and the iron roller 10 and the cavity between two adjacent heat dissipation fins 60 correspond to the water outlet shaft hole 206.

[0027] The water inlet sleeve 30 is provided with a water inlet 301, and the water discharge sleeve 40 is provided with a water discharge outlet 401. Dynamic seals 50 are respectively provided between the water inlet sleeve 30 and the water discharge sleeve 40 and the roller shaft 20. The axial water retaining layer 207 penetrates the roller shaft 20, and divides the roller shaft into a water inlet channel 201 and a water outlet channel 202. The water retaining baffle 101 divides the iron roller 10 into a cooling chamber 102 and a reflux chamber 103. The axial water retaining layer 207 is preferably formed integrally with the roller shaft 20.

[0028] In summary, compared with traditional copper rollers and molybdenum rollers used for rapid solidification, the quench roller 100 provided by the present invention and which can be used for rapid solidification of magnesium alloys is made of relatively inexpensive industrial pure iron, has a high melting point, does not react with magnesium and its alloy elements, has good processing performance, can be used on a large scale in industrial production, and greatly reduces costs.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling roller for rapid solidification of magnesium alloy, characterized in that: The roller of the quenching roller is an iron roller (10); The quenching roller comprises: a roller shaft (20), an iron roller (10) mounted on the roller shaft (20), and a water inlet sleeve (30) and a water discharge sleeve (40) respectively located on both sides of the iron roller (10) and mounted on the roller shaft (20); the roller shaft (20), the iron roller (10), the water inlet sleeve (30) and the water discharge sleeve (40) are all hollow structures; the interior of the roller shaft (20) is respectively connected to the interior of the iron roller (10), the water inlet sleeve (30) and the water discharge sleeve (40); The interior of the iron roller (10) is divided into a cooling chamber (102) and a reflux chamber (103) by a water retaining baffle (101), and the water retaining baffle (101) is provided with a water hole (104) communicating with the cooling chamber (102) and the reflux chamber (103); A water inlet channel (201) and a water outlet channel (202) separated by an axial water retaining layer (207) are provided in the roller shaft (20) along its axial direction; the water inlet channel (201) is provided with a water inlet axial hole (203) communicating with the inside of the water inlet sleeve (30) and a water outlet axial hole (206) communicating with the cooling chamber (102); the water outlet channel (202) is provided with a reflux axial hole (204) communicating with the reflux chamber (103) and a drainage axial hole (205) communicating with the inside of the drainage sleeve (40); The water inlet sleeve (30) is provided with a water inlet (301), and the water discharge sleeve (40) is provided with a water discharge outlet (401); The water inlet shaft hole (203), the water outlet shaft hole (206), the return shaft hole (204) and the drainage shaft hole (205) are at least two in number and are evenly distributed along the circumference of the roller shaft (20); The water outlet shaft holes (206) have multiple groups and are distributed on the roller shaft (20) at non-equidistant intervals, and in a direction approaching the axial water retaining layer (207), the distance between two adjacent groups of water outlet shaft holes (206) gradually decreases; The inner wall of the iron roller (10) is provided with a plurality of heat dissipation fins (60) extending in the radial direction thereof, and one end of the heat dissipation fin (60) away from the inner wall of the iron roller (10) is separated from the roller shaft (20), and one end of the heat dissipation fin (60) close to the inner wall of the iron roller (10) is provided with a fin hole (601), so that the cavities formed between the plurality of heat dissipation fins are connected; The cavity between the heat dissipation fin (60) and the iron roller (10) and the cavity between two adjacent heat dissipation fins (60) correspond to the water outlet shaft hole (206).

2. The rapid cooling roller for rapid solidification of magnesium alloy according to claim 1, characterized in that: Dynamic seals (50) are respectively provided between the iron roller (10), the water inlet sleeve (30), the water discharge sleeve (40) and the roller shaft (20).

3. The rapid cooling roller for rapid solidification of magnesium alloy according to claim 1, characterized in that: The iron roller (10) is made of industrial pure iron.

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