WO2017113520A1

WO2017113520A1 - Device and method for treating a melt with high shear and strong electromagnetic stirring

Info

Publication number: WO2017113520A1
Application number: PCT/CN2016/077228
Authority: WO
Inventors: 高志华; 徐骏; 张志峰; 张少明
Original assignee: 北京有色金属研究总院
Priority date: 2015-12-29
Filing date: 2016-03-24
Publication date: 2017-07-06

Abstract

Provided are a device and method for treating a melt with high shear and strong electromagnetic stirring. The device is mainly composed of a crucible (4), a core rod (5) installed within the crucible (4), and an electromagnetic stirring device installed outside the crucible (4). The electromagnetic stirring device comprises a water tank (1) and an electromagnetic stirrer (3) placed in the water tank. The shape of the crucible (4) is semi-conical or cylindrical. The shape of the core rod (5) is a semi-conical or cylindrical structure at the upper end and a spiral structure at the lower end. The centre of the core rod (5) is a hollow structure, with the shape thereof being semi-conical or cylindrical. The core rod (5) and the crucible (4) are coaxial. The device can be used for treating an alloy melt, such as an aluminium alloy, a magnesium alloy, a copper alloy, a zinc alloy and a titanium alloy, and a particle-reinforced metal based composite material thereof. The temperature field and ingredient field of a metal melt treated by the device are very uniform, and a moulded blank and parts have fine and uniform textures, uniformly distributed ingredients, reduced casting defects and improved properties.

Description

Device and method for high shear strong electromagnetic stirring melt processing

Technical field

The invention belongs to the technical field of metal materials and processing and forming thereof, and particularly relates to a device and a method for high shear strong electromagnetic stirring melt processing.

Background technique

The refinement and homogenization of solidification structure is the key link to improve the performance and quality of metal materials, and it is the technical basis for realizing the near-final forming process of metal materials. However, due to the inherent solidification characteristics of the metal material, the structure usually exhibits the distribution characteristics of "tri-crystal zone", and there are problems such as coarse grain, segregation of components, and uneven structure, which is especially obvious for solidification of large-volume alloy melt. Therefore, how to obtain a fine, round, evenly distributed solidification structure has always been a hot issue for material scholars. In response to this scientific problem, both domestic and foreign attempts have been made to apply the external field to intervene in the solidification process of the alloy melt. By applying the external field, the alloy melt is strongly disturbed, and the temperature field and composition field of the alloy melt are more uniform, and the alloy melt is A large amount of nucleation is simultaneously carried out in the entire melt range, thereby achieving precise control of the solidification structure of the alloy melt, obtaining a fine and uniform solidified structure, and finally refining the grain structure.

The electromagnetic stirring method has the advantages of high energy density and cleanliness, superior responsiveness and controllability, easy automation, high energy utilization, etc., so it is the first to achieve industrialization and obtain a wide range of commercial applications. U.S. Patent Nos. 4,344,837 and 4,229, 022, and Chinese Patent No. 200420112702.0, 200510086377.4 and 201220715064.6 all disclose electromagnetic stirring methods for preparing alloy slurries or blanks, the main principle of which is to use a strong electromagnetic stirring to cause the alloy melt to flow to obtain a relatively uniform temperature. The field and the composition field ultimately refine the grain structure of the alloy. However, due to the electromagnetic induction skin effect, the agitation is concentrated only on a small thin layer on the surface, so that the large-area metal liquid stirring effect is poor, so that the molten metal cannot be uniformly stirred from the core. The temperature field and composition field distribution of the alloy melt to the edge are not uniform. The higher the frequency, the more obvious the skin effect. The greater the distance from the outer surface of the section, the more intense the attenuation of the induced current. Therefore, most electromagnetic stirring devices and methods use the method of reducing the frequency to weaken the skin effect, but the low frequency not only weakens the stirring strength, but also needs to add a frequency conversion device, which increases the equipment investment cost and increases the preparation cost of the alloy slurry. Chinese Patent No. 200810116181 proposes a ring-slit electromagnetic stirring device and method for placing a mandrel in a core portion of a melt to form a melt gap, and realizing a slurry in a ring-stitching pulping system with adjustable stirring slit width Stirring. The ring seam not only avoids the part with low magnetic induction intensity, but also effectively avoids the unevenness of the stirring force caused by the electromagnetic induction skin effect, and turns the alternating electromagnetic field skin effect disadvantage into an advantage, making full use of the skin effect layer with high magnetic induction intensity. The advantages of the same, at the same time increase the heat dissipation area of the core of the melt, so that the slurry obtains a more uniform temperature field and composition field, and uniform stirring can be achieved by using the power frequency current. Reduced frequency conversion equipment and reduced costs. However, due to the limited width of the gap, only a small volume of melt can be processed, the amount of melt treatment is limited, and the inherent characteristics of electromagnetic stirring, the electromagnetic force is distributed circumferentially in the melt, and the flow of the melt is also moved in the circumferential direction. The laminar flow dominates, which inevitably produces temperature gradients and compositional gradients distributed along the radial and axial directions. U.S. Patent No. 5,135,564 also teaches a similar electromagnetic stirring apparatus and method which controls the agitation of the melt mainly by a rotating magnetic field and a mandrel which can be moved up and down, avoiding the place where the melt is less affected by the electromagnetic force and Increasing the heat dissipation of the melt, but the melt agitation effect produced by electromagnetic stirring is moving in the circumferential direction, mainly laminar flow, it is difficult to produce radial and axial flow of the melt, which is also inevitable The temperature gradient and component gradient distributed along the radial and axial directions, the mandrel moving up and down can enhance the flow above and below the melt, but the effect is limited, and the equipment is quite complicated, the operation is difficult, and the production cost is high. At the same time, the above several electromagnetic stirring devices and methods easily cause disturbance of the surface of the melt while stirring the melt, destroying the oxide film of the surface layer of the melt, causing the melt to slag and thereby contaminating the melt.

Summary of the invention

In view of the above problems, it is an object of the present invention to provide an apparatus and method for high shear strong electromagnetic stirring melt processing. The device is mainly composed of an electromagnetic stirring device, a preparation crucible and a mandrel. The electromagnetic stirring device comprises a special structure water tank and a special size electromagnetic stirrer; the preparation crucible has a special shape; the mandrel has a special position, shape and material. Based on the above device, a high-shear strong electromagnetic stirring melt treatment method is proposed, which relies on a special structure of the electromagnetic stirring device, a special shape of the preparation of the crucible and a special position, shape and material of the core rod structure to realize the alloy melt only The internal high-shear severe cyclic turbulent disturbance disturbs the surface, which overcomes the uneven agitation caused by the electromagnetic stirring and the skin effect (especially the large-volume alloy melt), and solves the ordinary electromagnetic stirring melt shear. The cutting rate is weak, the stirring strength is low, and the melt is easy to be entangled in the stirring process, and finally the temperature field and the component field uniformly distributed in the entire melt volume are obtained; at the same time, it is difficult to treat the large volume alloy melt by ordinary electromagnetic stirring. A strong shear melt homogenization treatment of a large volume alloy melt is achieved.

The utility model relates to a high shear strong electromagnetic stirring melt processing device, which is mainly composed of a crucible, a mandrel installed in a crucible, and an electromagnetic stirring device installed on the periphery of the crucible, the electromagnetic stirring device comprising a water tank and being placed in a magnetic stirrer in the water tank; the shape of the crucible is semi-tapered or cylindrical, the upper end of the shape of the mandrel is a semi-tapered structure or a cylindrical structure, the lower end is a spiral structure, and the middle of the core rod is a hollow structure. The hollow portion is semi-conical or cylindrical in shape; the mandrel is coaxial with the crucible.

The outermost wall of any one of the threads of the lower end of the mandrel has the same shortest vertical distance from the inner wall of the crucible, the distance is 5 to 50 mm, the thread height is 5 to 100 mm, the thread pitch is 20 to 150 mm, and the thread cross-sectional shape is Isosceles trapezoid or rectangular, isosceles trapezoidal sharp angle is 45 ~ 90 ° (excluding 90 °), that is 45 ° ≤ isosceles trapezoidal sharp angle < 90 °; thread can be single thread, double thread or multi-line Thread; the length of the lower end of the mandrel (the entire thread) is between one-fifth and four-fifth of the length of the mandrel.

The semi-tapered structure or the cylindrical structure of the upper end of the mandrel has the same longitudinal section and the shape of the longitudinal section, and the longitudinal section thereof is an isosceles trapezoid or a rectangle, and the isosceles trapezoidal bottom angle is 60° to 120° (excluding 90). °), that is, 60 ° ≤ isosceles trapezoidal bottom angle < 90 °, or 90 ° < isosceles trapezoidal bottom angle ≤ 120 °; semi-conical or cylindrical structure on the outer wall and the shortest vertical of the inner wall of the crucible The distance is the same and the size is 10~150mm.

The middle portion of the mandrel is a hollow structure, the inner cavity is semi-conical or cylindrical), the longitudinal section is an isosceles trapezoid or a rectangle, and the angle of the isosceles trapezoidal bottom is 60° to 120° (excluding 90°), that is, 60° ≤ isosceles trapezoidal bottom angle <90°, or 90° < isosceles trapezoidal bottom angle ≤ 120°, the same as the escapement section shape, the shortest vertical distance between any position on the inner wall of the mandrel and the inner wall of the crucible is the same, The size is 15 to 155 mm.

The distance between the bottom of the mandrel and the bottom of the crucible is 5 to 100 mm, and the distance between the top and the melt liquid surface is 5 to 200 mm.

The mandrel is a non-magnetic metal material such as austenitic stainless steel, titanium, molybdenum, cobalt, chromium, nickel or copper, or a non-metallic material such as graphite, ceramic or corundum.

The shape of the crucible is semi-conical or cylindrical, and the longitudinal section thereof is an isosceles trapezoid or a rectangle, and the angle of the isosceles trapezoidal bottom is 60° to 120° (excluding 90°), that is, 60°≤ isosceles trapezoidal bottom. Angle number <90° or 90° < isosceles trapezoidal bottom angle ≤ 120°. The bottom radius of the crucible is 50-500mm and the height is 50-1000mm. The material is austenitic stainless steel, non-magnetic metal materials such as titanium, molybdenum, cobalt, chromium, nickel or copper, or non-metallic materials such as graphite, ceramic or corundum.

The bottom of the crucible is provided with a discharge port, and the slurry can be opened after being processed for slurry injection molding equipment.

The upper plate of the water tank is a plate shielding magnetic field, such as an iron-nickel alloy plate, for shielding the magnetic field to be led upward, and only agitating the melt surrounded by the electromagnetic stirrer; and the water tank is connected to the cooling circulating water for cooling and stirring. The coil in the process to avoid overheating.

The height of the electromagnetic stirrer has a specific value, and the height value is the same as the height of the spiral portion at the lower end of the mandrel, and is opposite thereto; the stirring coil is a three-phase multi-pole (3, 6, and 9 pairs); the stirring frequency can be not only For low frequency, it can also be power frequency, medium frequency and even high frequency; the stirring current range is 5A ~ 500A, to achieve strong turbulent motion of stirring melt strong shear.

Based on the above apparatus, the present invention provides a method for high shear strong electromagnetic stirring melt processing, comprising the steps of: firstly fixing a mandrel in a concrete manner inside a crucible, and injecting a specific mass of metal melt into the crucible, The electromagnetic stirrer is turned on and the cooling circulating water is introduced into the water tank; the melt is only disturbed by the internal high-shear severe circulation turbulence and the surface is not moved, and the temperature and composition of the whole melt volume are uniformly distributed; after the treatment is completed, the crucible is opened. The bottom discharge port injects the treated melt into the molding apparatus.

The apparatus and method of the present invention can not only process a common aluminum alloy melt, but also an alloy melt such as a magnesium alloy, a copper alloy, a zinc alloy, a titanium alloy, and a particle-reinforced metal matrix composite thereof. Treated melt It can be injected into extrusion casting equipment, die casting equipment, semi-continuous casting equipment and other molding equipment.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a high shear strong electromagnetic stirring melt processing apparatus of the present invention.

Figure 2 is a schematic diagram of high shear strong electromagnetic stirring melt flow.

The main reference signs indicate:

1 water tank 2 water tank top cover

3 Electromagnetic stirrer 4 Preparation 坩埚

5 mandrel 6 thread

7 discharge port 8 metal melt

detailed description

As shown in FIG. 1, the apparatus for processing high shear strong electromagnetic stirring melt of the present invention is mainly composed of a preparation crucible 4, a core rod 5 and an electromagnetic stirring device, and the core rod 5 is fixed in the preparation crucible 4, and the electromagnetic stirring device is placed. Prepare the periphery of 坩埚4. The electromagnetic stirring device includes a magnetic stirrer 3 and a water tank 1, and the electromagnetic stirrer 3 is placed in the water tank 1.

The mandrel 5 is composed of a hollow semi-conical tube or a cylindrical tube and a spiral structure disposed at a lower end thereof. The lower end of the shape of the mandrel 5 has a spiral structure, the upper end is a semi-tapered structure or a cylindrical shape, and the middle of the mandrel 5 is a hollow structure, and the mandrel 5 is coaxial with the preparation crucible 4.

The outermost wall of each thread 6 of the lower end spiral structure of the mandrel 5 is the same as the shortest vertical distance of the inner wall of the preparation crucible 4, and the shortest vertical distance is 5 to 50 mm, the height of the thread 6 is 5 to 100 mm, and the thread 6 has a pitch of 20 to 150 mm. The cross-sectional shape of the thread 6 is an isosceles trapezoid or a rectangle, the isosceles trapezoidal sharp angle is 45-90° (excluding 90°), and the thread 6 can be a single-thread thread, a double-thread thread or a multi-thread thread; the lower end of the mandrel 5 is entirely The length of the thread 6 is one-fifth to four-fifth of the length of the mandrel 5, for example, the length of the entire thread 6 at the lower end of the mandrel 5 is two-fifths of the length of the mandrel 5.

The longitudinal section of the upper semi-tapered or cylindrical structure of the mandrel 5 is the same as the longitudinal section of the preparation 坩埚4, both of which are isosceles trapezoidal or rectangular, and the two isosceles trapezoids or rectangular shapes are similar, semi-conical or cylindrical The shortest vertical distance from the position on the outer wall of the structure to the inner wall of the preparation crucible 4 is the same, and the size is 10 to 150 mm.

In the hollow structure in the middle of the mandrel 5, the inner cavity is semi-tapered or cylindrical, and the cross section is an isosceles trapezoid or a rectangle, which is the same as the longitudinal section of the preparation crucible 4, and the shortest vertical position from the inner wall to the inner wall of the crucible 4 is prepared. The distance is the same, the size is 15 ~ 155mm.

The distance between the bottom of the mandrel 5 and the bottom of the preparation crucible 4 is 5 to 100 mm, and the distance from the top of the metal melt 8 is 5 to 200 mm.

The mandrel 5 is a non-magnetic metal material such as austenitic stainless steel, titanium, molybdenum, cobalt, chromium, nickel or copper, or a non-metallic material such as graphite, ceramic or corundum.

The crucible 4 has a special shape and is semi-conical or cylindrical in shape, and its longitudinal section is an isosceles trapezoid or Rectangular, isosceles trapezoidal bottom angle is 60 ° ~ 120 ° (excluding 90 °). The crucible has a bottom radius of 50-500 mm and a height of 50-1000 mm. The material is austenitic stainless steel, non-magnetic metal materials such as titanium, molybdenum, cobalt, chromium, nickel or copper, or non-metallic materials such as graphite, ceramic or corundum. .

A discharge port 7 is left at the bottom of the preparation crucible 4, and the slurry can be opened after being processed for slurry injection molding equipment.

The upper cover 2 of the water tank is an iron-nickel alloy plate shielding magnetic field for shielding the magnetic field to be led upward, and only the metal melt 8 surrounded by the electromagnetic stirrer 3 is agitated; at the same time, the water tank 1 is connected to the cooling circulating water for cooling the stirring process. The coil in the middle to avoid overheating.

The height of the electromagnetic stirrer 3 has a specific value, and the height value is the same as the height of the spiral portion at the lower end of the mandrel 5, and is opposite thereto; the stirring coil is a three-phase multi-pole (3, 6, and 9 pairs); the stirring frequency can be not only Low frequency, can also be power frequency, medium frequency and even high frequency; the stirring current range is 5A ~ 500A, to achieve the strong turbulent motion of the stirring metal melt 8 strong shear.

Hereinafter, the high-shear strong electromagnetic stirring melt processing apparatus and the processing method of the present invention will be further described by taking the 7075 aluminum alloy as an example.

In the high shear strong electromagnetic stirring melt processing device, the height of the mandrel 5 is 250 mm, and the shortest vertical distance between the outermost wall of each thread 6 of the lower end spiral structure and the inner wall of the preparation crucible 4 is 10 mm, and the height of the thread 6 is 30mm, thread 6 pitch 100mm, thread 6 cross-sectional shape is isosceles trapezoid, isosceles trapezoidal sharp angle number is 70°, thread 6 is double thread; the length of the whole thread 6 of the lower end of mandrel 5 is five points of mandrel 5 of two. The longitudinal section of the semi-tapered or cylindrical structure of the upper end of the mandrel 5 is similar to the longitudinal section of the preparation 坩埚4, and the shortest vertical distance from any position on the outer wall of the semi-tapered or cylindrical structure to the inner wall of the crucible 4 is 40 mm. . The shortest vertical distance from any position on the inner wall of the mandrel 5 to the inner wall of the preparation crucible 4 is 42 mm. The bottom of the mandrel 5 is at a distance of 15 mm from the bottom of the preparation crucible 4. The material of the mandrel 5 is a titanium alloy material.

The longitudinal section of the preparation crucible 4 is an isosceles trapezoid, and the isosceles trapezoidal bottom angle is 80°. The crucible 4 has a bottom radius of 80 mm and a height of 350 mm, and is made of a titanium alloy material.

The stirring stirrer of the electromagnetic stirrer 3 is three-phase three-pole; the stirring frequency is 50 Hz; the stirring current is 100A.

Firstly, the 7075 aluminum alloy metal melt 8 of 720 ° C is injected into the preparation crucible 4 which has fixed the mandrel 5 in a corresponding manner, and the liquid level of the metal melt 8 is ensured to be 35 mm higher than the top of the mandrel, and the electromagnetic stirrer 3 is activated. Cooling circulating water is introduced into the water tank 1; relying on a special structure of the electromagnetic stirring device, the special shape of the preparation 坩埚4 and the special position, shape and material of the mandrel 5 structure to realize the metal melt 8 only in the internal high shear cycle The flow is disturbed and the surface is not moving. As shown in Fig. 2, the electromagnetic stirring is overcome due to the circumferential motion characteristics and the skin effect caused by the agitation unevenness (especially the bulk alloy melt), and the common electromagnetic stirring melt shear is solved. The rate is weak, the stirring intensity is low, and the melt is easy to wind up the slag during the stirring process, and finally the temperature field and the component field uniformly distributed in the entire melt volume are obtained. At the same time, it is difficult to treat the large volume alloy melt by ordinary electromagnetic stirring. Large volume The strong shear melt of the gold melt is homogenized; after the temperature of the metal melt 8 is lowered to 645 ° C, the bottom discharge port 7 of the crucible 4 is opened, and the treated metal melt 8 is injected into the extrusion casting equipment. forming. Compared with ordinary extruded casting parts, the extruded and cast parts treated by the device and method have fine and uniform microstructure, the grain size is reduced by 48%, the chemical composition segregation is greatly reduced, the solidification defects are few, and the mechanical properties are effectively improved. Tensile strength, yield strength and elongation increased by 30%, 26% and 32%, respectively.

The material of the mandrel 5 may also be a non-magnetic metal material such as austenitic stainless steel, molybdenum, cobalt, chromium, nickel or copper, or a non-metal material such as graphite, ceramic or corundum; due to the special material of the mandrel 5, the device and The method can not only process the common aluminum alloy melt, but also the alloy melt of magnesium alloy, copper alloy, zinc alloy, titanium alloy and the particle-reinforced metal matrix composite material thereof.

The temperature field and composition field of the metal melt alloy processed by the invention are very uniform, the microstructure of the formed blank and the parts are uniform and uniform, the composition distribution is uniform, the casting defects are greatly reduced, the performance is greatly improved, the product production efficiency is improved, and the product cost is greatly reduced.

Industrial applicability

Advantages of the present invention compared to the prior art:

Compared with the traditional electromagnetic stirring, relying on the electromagnetic stirring device with special structure, the special shape of the preparation crucible and the special position, shape and material of the mandrel structure, the alloy melt is only disturbed by the internal high shear severe cyclic turbulence. Does not move, overcomes the electromagnetic stirring due to circumferential motion characteristics and skin effect caused by uneven mixing (especially large volume alloy melt), solves the ordinary electromagnetic stirring melt shear rate is weak, the stirring strength is low, the melting process is melting The shortcomings of the easy-volume air-rolling slag finally result in a uniform distribution of the temperature field and the composition field in the entire melt volume. At the same time, it is difficult to handle the large-volume alloy melt by ordinary electromagnetic stirring, and the strong shear of the large-volume alloy melt is realized. Melt homogenization treatment.

The temperature field and composition field of the metal melt alloy treated by the device and method of the invention are very uniform, the microstructure of the formed blank and the parts are uniform and uniform, the composition distribution is uniform, the casting defects are greatly reduced, the performance is greatly improved, and the production efficiency is improved, and the production efficiency is greatly reduced. Product Cost.

Claims

The utility model relates to a high shear strong electromagnetic stirring melt processing device, characterized in that the device is mainly composed of a crucible, a mandrel installed in the crucible, and an electromagnetic stirring device installed on the periphery of the crucible, wherein the electromagnetic stirring device comprises a water tank and a magnetic stirrer placed in the water tank; the shape of the crucible is semi-tapered or cylindrical, and the upper end of the mandrel has a semi-tapered structure or a cylindrical structure, and the lower end is a spiral structure, and the core rod is in the middle In the hollow structure, the shape of the hollow portion is semi-conical or cylindrical; the mandrel is coaxial with the crucible.
The apparatus for high shear strong electromagnetic stirring melt processing according to claim 1, wherein the outermost wall of any one of the threads of the mandrel spiral structure has the same vertical distance from the inner wall of the crucible.
The apparatus for processing high-shear electromagnetic stirring melt according to claim 2, wherein the longitudinal cross-section of the semi-conical or cylindrical structure of the mandrel is the same as the shape of the longitudinal section, the half The vertical distance between any position on the outer wall of the tapered structure or the cylindrical structure is the same as the inner wall of the crucible.
The apparatus for processing high-shear electromagnetic stirring melt according to claim 3, wherein the longitudinal section of the hollow portion of the mandrel has the same shape as the longitudinal section, and any position on the inner wall of the mandrel is The vertical distance of the inner wall of the crucible is the same.
The apparatus for high-impact strong electromagnetic stirring melt processing according to claim 2, wherein the outermost wall of any one of the threads of the mandrel spiral structure has a shortest vertical distance from the inner wall of the crucible of 5 to 50 mm.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 3, wherein the shortest vertical distance between the position of the outer wall of the semi-conical structure or the cylindrical structure of the mandrel and the inner wall of the crucible is 10 ~150mm.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 4, wherein the shortest vertical distance between any position on the inner wall of the mandrel and the inner wall of the crucible is 15 to 155 mm.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 5, wherein said thread has a height of 5 to 100 mm and a pitch of 20 to 150 mm.
The apparatus for high shear strong electromagnetic stirring melt processing according to claim 8, wherein said thread has a cross-sectional shape of an isosceles trapezoid or a rectangle.
The apparatus for high-impact strong electromagnetic stirring melt processing according to claim 9, wherein the isosceles trapezoidal sharp angle number is 45° or more and less than 90°.
The apparatus for high shear strong electromagnetic stirring melt processing according to claim 5, wherein the thread is a single thread, a double thread or a multi thread.
The apparatus for high shear strong electromagnetic stirring melt processing according to claim 5, wherein said mandrel spiral structure has a length of from one fifth to four fifths of the length of the mandrel.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 5, wherein the distance between the bottom of the mandrel and the bottom of the crucible is 5 to 100 mm, and between the top and the melt level. The distance is 5 to 200 mm.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 4, wherein the longitudinal section of the crucible is an isosceles trapezoid or a rectangle.
The apparatus for processing high-shear electromagnetic stirring melt according to claim 14, wherein the number of the isosceles trapezoidal bottom angle is 60° or more and less than 90°, or more than 90° and less than or equal to 120. °.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 13, wherein said crucible bottom has a radius of 50 to 500 mm and a height of 50 to 1000 mm.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 16, wherein the bottom of the crucible is provided with a discharge opening.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 1, wherein the core rod and the crucible are made of austenitic stainless steel, titanium, molybdenum, cobalt, chromium, nickel, copper, Graphite, ceramic or corundum.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 1, wherein the upper plate of the water tank is a plate material for shielding a magnetic field.
The apparatus for high shear strong electromagnetic stirring melt processing according to claim 1, wherein the height of the electromagnetic stirrer is the same as the height of the spiral portion at the lower end of the mandrel.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 20, wherein the stirring coil of the electromagnetic stirrer is a three-phase multi-pole.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 21, wherein the stirring coil of the electromagnetic stirrer is three-phase three, six or nine pairs.
The apparatus for processing high shear strong electromagnetic stirring melt according to claim 22, wherein the stirring frequency of the electromagnetic stirrer is low frequency, power frequency, intermediate frequency or high frequency; and the stirring current is 5A to 500A.
A high shear strong electromagnetic stirring melt processing method, using the high shear strong electromagnetic stirring melt processing apparatus according to any one of claims 1 to 23, comprising the steps of: first fixing the mandrel to the crucible Internally, the metal melt is injected into the crucible, the electromagnetic stirrer is turned on and the cooling circulating water is introduced into the water tank; the melt is only disturbed by the internal high shear cycle turbulence and the surface is not moved, so that the entire melt volume temperature And the components are evenly distributed; after the treatment is completed, the bottom discharge port of the crucible is opened, and the treated melt is injected into the molding apparatus.
The apparatus for processing high shear strong electromagnetic stirring melt according to any one of claims 1 to 23 for treating aluminum Use in alloys, magnesium alloys, copper alloys, zinc alloys or titanium alloy melts and their particle-reinforced metal matrix composites.