CN111250671A - A quench roll for rapid solidification of magnesium alloys - Google Patents

Abstract

The invention discloses a quenching roll used for rapid solidification of magnesium alloys, belonging to the technical field of magnesium alloy preparation. Compared with the traditional copper rolls and molybdenum rolls used for rapid solidification, the quenching roll provided by the invention is made of relatively inexpensive industrial pure iron, has a high melting point, and does not react with magnesium and its alloying elements. , good processing performance, can be used in large-scale industrial production, so that the cost is greatly reduced.

Description

A quench roll for rapid solidification of magnesium alloys

technical field

The invention relates to the technical field of magnesium alloy preparation, in particular to a quench roll used for rapid solidification of magnesium alloys.

Background technique

Due to the depletion of energy and the intensification of environmental protection pressure, the world has put forward urgent requirements for lightweight. Magnesium alloys are known as "green engineering materials" and "era metals" in the 21st century due to their excellent thermal conductivity, recyclability, anti-electromagnetic interference and excellent damping properties, and are rich in magnesium resources. The automotive industry, rail transit, aerospace, robotics, household appliances, leisure and entertainment and other fields have broad application prospects. However, due to its poor mechanical properties and low yield strength, its application has been limited, and it 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. Through the principle of solid solution strengthening and fine grain strengthening, the yield strength of magnesium alloys can be greatly improved, making it even higher than that of ordinary steel and aluminum alloys.

The traditional rolls used for rapid quenching of magnesium alloys mostly use copper rolls and molybdenum rolls with good thermal conductivity. However, because copper and molybdenum are expensive, if they are used to prepare rolls that can be used in large-scale production and have a wider working surface, The high cost is not conducive to large-scale application in industrial production. In addition, the melting point of copper is low, and there is a chemical reaction between magnesium and copper. When copper rollers are used for rapid quenching of magnesium alloys, it is easy to introduce impurity Cu, which affects the comprehensive performance of magnesium alloys. Therefore, it is necessary to find an inexpensive material that can be used for the rapid solidification of magnesium alloys to prepare quench rolls, and has a simple structural design to facilitate manufacturing and processing.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a quench roll for rapid solidification of magnesium alloys, so as to solve the problems of high cost and inability to realize large-scale rapid production of quench rolls existing in the existing rapid solidification to prepare magnesium alloys.

The technical scheme that the present invention solves the above-mentioned technical problems is as follows:

The utility model relates to a quenching roller for rapid solidification of magnesium alloys, wherein the roller of the quenching roller is an iron roller.

Further, in a preferred embodiment of the present invention, the above-mentioned quenching roller comprises: a roller shaft, an iron roller assembled on the roller shaft, and a water inlet sleeve and The drain sleeve, the roller shaft, the iron roller, the water inlet sleeve and the drain sleeve are all hollow structures, and the inside of the roller shaft is communicated with the iron roller, the water inlet sleeve and the drain sleeve respectively.

Further, in a preferred embodiment of the present invention, the inside of the above-mentioned iron roller is divided into a cooling cavity and a return cavity by a water blocking partition, and the water blocking partition is provided with a water hole connecting the cooling cavity and the return cavity; In the axle, along its axial direction, there are water inlet and outlet channels separated by the water retaining layer of the shaft center. The water outlet channel is provided with a return shaft hole communicated with the return cavity and a drainage shaft hole communicated with the inside of the drainage sleeve; the water inlet sleeve is provided with a water inlet, and the drainage sleeve is provided with a drainage outlet.

Further, in a preferred embodiment of the present invention, there are at least two water inlet shaft holes, water outlet shaft holes, return shaft holes and drainage shaft holes, and they are distributed evenly along the circumference of the roller shaft.

Further, 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 non-equidistantly, and in the direction close to the axial water retaining layer, two adjacent groups of water outlet shaft holes are formed. The distance between them gradually decreases.

Further, in a preferred embodiment of the present invention, the inner wall of the iron roller is provided with a plurality of cooling fins extending along its radial direction, and the end of the cooling fins away from the inner wall of the iron roller is separated from the roller shaft, One end of the radiating fins close to the inner wall of the iron roller is provided with fin holes, so that the cavities formed between the plurality of radiating fins are communicated.

Further, in a preferred embodiment of the present invention, the cavity between the above-mentioned radiating fins and the iron roller and the cavity between two adjacent radiating fins correspond to the water outlet shaft holes.

Further, in a preferred embodiment of the present invention, dynamic seals are respectively provided between the above-mentioned iron rollers, the water inlet sleeve and the drainage sleeve and the roller shafts.

Further, in a preferred embodiment of the present invention, the above-mentioned iron roller is prepared from industrial pure iron.

The present invention has the following beneficial effects:

The invention uses iron rollers instead of expensive copper rollers and molybdenum rollers to prepare rapidly solidified magnesium alloys, which greatly saves equipment investment costs, and can be used for large-scale production of large-scale rollers with wider working surfaces. It generates huge equipment input cost and can be applied on a large scale in industrial production. The invention has another advantage of replacing the copper roller with the iron roller: the melting point of copper (1083.4°C) is not much higher than the melting point of magnesium (650°C), and the reaction between copper and magnesium is easy to occur. When the copper roller is used for magnesium alloys It is easy to introduce impurity Cu during rapid solidification, which affects the comprehensive properties of magnesium alloys; this application uses iron rollers for rapid solidification of magnesium alloys, and its melting point (1538 ° C) is relatively high compared to magnesium. It is important that the gap between magnesium and iron is No chemical reaction occurs, 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 smaller than that of brass (about 92W/(m·K)), which can meet the requirements of good thermal conductivity. On the premise of saving cost and improving the purity of magnesium alloy, reducing the introduction of impurities.

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. Control the water flow direction of the cooling water inside the iron roller, so as to achieve 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 good cooling effect, simple structure design, convenient manufacturing and processing, and low cost. Production efficiency of rapid quenching of magnesium alloys.

In the invention, a water blocking baffle is arranged inside the iron roller, and the inside of the iron roller is divided into a cooling chamber and a return chamber, and the roller shaft is also divided into a water inlet channel and a water outlet channel by the axial water retaining layer. Due to the existence of the water retaining layer at the shaft center, the forced cooling water flows into the cooling cavity inside the iron roller through the water inlet shaft hole for heat exchange, rather than directly flowing out from the roller shaft. In order to make the cooling degree of the roller uniform, the water outlet shaft holes arranged on the roller shaft of the present invention are not equidistant. The water flows in the direction of the water through holes of the roller with heat, and the subsequent design of the water outlet holes of the shaft is more and more dense, in order to increase the amount of water inflow, so as to reduce the temperature of the flowing water, so as to play a better role in the roller. The cooling effect makes the temperature more uniform, and the number of openings can be designed according to the width of the roller. In order to achieve better cooling effect, the cooling water should flow through the inner wall of the iron roller, so the present invention arranges the water passage holes on the water blocking baffle close to the inner wall of the iron roller wheel.

Description of drawings

FIG. 1 is a schematic structural diagram of a quench roll according to an embodiment of the present invention, and the arrow shown in the figure is the flow direction of the cooling medium;

FIG. 2 is a cross-sectional view along A-A of the quench roll according to the embodiment of the present invention.

In the figure: 100-quenching roller; 10-iron roller; 101-water retaining baffle; 102-cooling cavity; 103-return cavity; 104-water hole; 20-roller shaft; 201-water inlet channel; 202- Outlet channel; 203-water inlet shaft hole; 204-return shaft hole; 205-drain shaft hole; 206-water outlet shaft hole; 207-axial water retaining layer; 30-water inlet sleeve; 301-water inlet; 40 - Drain sleeve; 401 - Drain; 50 - Dynamic seal.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

Example

Referring to FIG. 1 , a quenching roll 100 used for rapid solidification of magnesium alloys, the roll wheel of the quenching roll 100 is an iron roll wheel 10 . The iron roller 10 is made of industrial pure iron. As shown in FIG. 1 , the quench roll 100 according to the embodiment of the present invention includes: a roll shaft 20 , an iron roll 10 assembled on the roll shaft 20 , and water inlets respectively located on both sides of the iron roll 10 and assembled on the roll shaft 20 Sleeve 30 and Drain Sleeve 40. The roller shaft 20 , the iron roller 10 , the water inlet sleeve 30 and the drain sleeve 40 are all hollow structures. The inside of the roller shaft 20 is communicated with the inside of the iron roller 10 , the water inlet sleeve 30 and the drain sleeve 40 , respectively.

Referring to FIG. 1 , the inside of the iron roller 10 is divided into a cooling cavity 102 and a return cavity 103 by a water blocking partition 101 . The water blocking baffle 101 is arranged in a direction perpendicular to the axial direction of the iron roller 10 , and divides the inside of the iron roller 10 into two cavities along the axial direction: a cooling chamber 102 and a return chamber 103 . The water blocking baffle 101 matches the cross-sectional shape of the iron roller 10 , and its edge is connected with the inner wall of the iron roller 10 . Preferably, the water blocking partition 101 is a circular partition, and the water blocking partition 101 and the iron roller 10 are integrally formed. The volume occupied by the cooling cavity 102 is significantly larger than that of the recirculation cavity 103, which is conducive to concentrating more cooling medium in the cooling cavity 102, improving the cooling effect, and under the action of the water blocking baffle 101, the cooling medium must fill the entire cooling Only then can the cavity 102 flow into the return cavity 103 through the water passage hole 104 on the partition plate, and then flow out. The direct outflow of the cooling medium is avoided, the flow path of the cooling medium is extended, and the cooling is more uniform and the cooling effect is better. Referring to FIG. 2 , the water passage holes 104 on the water blocking baffle 101 that communicate with the cooling cavity 102 and the return cavity 103 are arranged close to the inner wall of the iron roller 10 , so that the cooling water flows into the return cavity 103 along the inner wall of the iron roller 10 . It takes away the heat on the wall of the iron roller 10, and has a good cooling effect.

Referring to FIG. 1 , the roller shaft 20 is provided with a water inlet channel 201 and a water outlet channel 202 separated by an axial water blocking layer 207 along its axial direction. The water inlet channel 201 is provided with a water inlet shaft hole 203 communicating with the inside of the water inlet sleeve 30 and a water outlet shaft hole 206 communicating with the cooling cavity 102 . The water outlet channel 202 is provided with a return shaft hole 204 communicating with the return cavity 103 and a drainage shaft hole 205 communicating with the inside of the drainage sleeve 40 . There are at least two water inlet shaft holes 203 , water outlet shaft holes 206 , return shaft holes 204 and drain shaft holes 205 , and they are distributed evenly along the circumference of the roller shaft 20 respectively. The water outlet shaft holes 206 are distributed on the roller shaft 20 in a plurality of groups and non-equidistantly. The number of each set 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 shown in FIG. 1 , in the direction close to the axial water blocking layer 207 , the distance between the adjacent two groups of water outlet shaft holes 206 decreases. That is, the closer to the axial water blocking layer 207 , the smaller the distance between the adjacent two 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 one end of the heat dissipation fins 60 away from the inner wall of the iron roller 10 is separated from the roller shaft 20 , and the heat dissipation fins 60 are close to the iron roller 10 . One end of the inner wall is provided with a fin hole 601, so that the cavities formed between the plurality of heat dissipation fins communicate with each other. The cavity between the heat dissipation fins 60 and the iron roller 10 and the cavity between two adjacent heat dissipation fins 60 correspond to the water outlet shaft holes 206 .

The water inlet sleeve 30 is provided with a water inlet 301 , and the drainage sleeve 40 is provided with a water outlet 401 . Dynamic seals 50 are respectively provided between the water inlet sleeve 30 and the drain sleeve 40 and the roller shaft 20 . The axial water blocking layer 207 runs through the roller shaft 20 and divides the roller shaft into a water inlet channel 201 and a water outlet channel 202 . The shaft center water blocking layer 207 is preferably integrally formed with the roller shaft 20 .

To sum up, compared with the traditional copper rolls and molybdenum rolls used for rapid solidification, the quench roll 100 provided by the present invention can be used for rapid solidification of magnesium alloys. Magnesium and its alloying elements react, have good processing performance, and can be used in large-scale industrial production, which greatly reduces the cost.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. The quenching roller for rapidly solidifying the magnesium alloy is characterized in that a roller wheel of the quenching roller is an iron roller wheel (10).

2. The chill roll for rapid solidification of magnesium alloys according to claim 1, wherein said chill roll comprises: the roller wheel comprises a roller wheel shaft (20), an iron roller wheel (10) assembled on the roller wheel shaft (20), and a water inlet sleeve (30) and a water outlet sleeve (40) which are respectively positioned on two sides of the iron roller wheel (10) and assembled on the roller wheel shaft (20), wherein the roller wheel shaft (20), the iron roller wheel (10), the water inlet sleeve (30) and the water outlet sleeve (40) are all of a hollow structure, and the inside of the roller wheel shaft (20) is respectively communicated with the inside of the iron roller wheel (10), the inside of the water inlet sleeve (30) and the inside of the water outlet sleeve (40).

3. The chill roll for magnesium alloy rapid solidification according to claim 2, wherein the interior of the iron roll wheel (10) is divided into a cooling cavity (102) and a return cavity (103) by a water-retaining partition plate (101), and the water-retaining partition plate (101) is provided with a water through hole (104) for communicating the cooling cavity (102) with the return cavity (103);

a water inlet channel (201) and a water outlet channel (202) which are separated by an axis water retaining layer (207) are arranged in the roller shaft (20) along the axial direction of the roller shaft, the water inlet channel (201) is provided with a water inlet shaft hole (203) communicated with the inside of the water inlet sleeve (30) and a water outlet shaft hole (206) communicated with the cooling cavity (102), and the water outlet channel (202) is provided with a backflow shaft hole (204) communicated with the backflow cavity (103) and a drainage shaft hole (205) communicated with the inside of the drainage sleeve (40);

the water inlet sleeve (30) is provided with a water inlet (301), and the water drainage sleeve (40) is provided with a water drainage port (401).

4. The chill roll for magnesium alloy rapid solidification according to claim 3, wherein the number of the water inlet shaft hole (203), the water outlet shaft hole (206), the backflow shaft hole (204) and the water discharge shaft hole (205) is at least two respectively, and the water inlet shaft hole, the water outlet shaft hole, the backflow shaft hole and the water discharge shaft hole are uniformly distributed along the circumference of the roller shaft (20) respectively.

5. The quenching roller for magnesium alloy rapid solidification according to claim 3 or 4, characterized in that the water outlet shaft holes (206) have multiple groups and are distributed on the roller shaft (20) in a non-equidistant way, and the distance between two adjacent groups of water outlet shaft holes (206) is gradually reduced in the direction close to the axial water retaining layer (207).

6. The chilled roll for magnesium alloy rapid solidification according to claim 3, wherein a plurality of heat dissipation fins (60) are provided on the inner wall of the iron roll wheel (10) and extend along the radial direction of the iron roll wheel, and one ends of the heat dissipation fins (60) far away from the inner wall of the iron roll wheel (10) are spaced from the roll wheel shaft (20), and one ends of the heat dissipation fins (60) near the inner wall of the iron roll wheel (10) are provided with fin holes (601) so that cavities formed among the plurality of heat dissipation fins are communicated.

7. The chill roll for magnesium alloy rapid solidification according to claim 6, wherein the cavities between the heat radiating fins (60) and the iron roll wheel (10) and the cavities between two adjacent heat radiating fins (60) correspond to the water outlet shaft hole (206).

8. The chill roll for magnesium alloy rapid solidification according to any one of claims 2 to 7, wherein dynamic seals (50) are respectively provided between the iron roll wheel (10), the water inlet sleeve (30) and the water discharge sleeve (40) and the roll wheel shaft (20).

9. The chill roll for rapid solidification of magnesium alloys according to claim 1, wherein the iron roll (10) is made of industrial pure iron.

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