CN104959578A - Combined type device for preparing semi-solid paste - Google Patents

Abstract

The invention discloses a compound device for preparing semi-solid slurry, which belongs to the technical field of material science; the motor of the device is connected with the outer barrel to drive the outer barrel to rotate, and the inside of the outer barrel is inlaid with a graphite cone barrel, and the side of the outer barrel is The wall is alternately provided with heating pipes and cooling pipes; the sprue is located on the top of the graphite cone barrel, and the outlet is facing the inner wall of the graphite cone barrel; the bottom of the graphite cone barrel is connected to the forming device, and the forming device is connected to the lower end of the outer barrel; forming Inside the device, there is a screw conveying rod under the graphite cone barrel. One end of the spiral conveying rod is connected to the gear, and the other end is facing the mold. The mold is located inside the cooling device; the motor, outer barrel, and graphite cone barrel are fixed on the machine body of the equipment. on the shelf. The device is simple in structure, easy to process, low in cost, short in the process of preparing semi-solid slurry, easy to form, and has certain application prospects.

Description

A compound device for preparing semi-solid slurry

technical field

The invention discloses a compound type device for preparing semi-solid slurry, which belongs to the technical field of material science.

Background technique

Metal semi-solid forming refers to that during the solidification process of the metal in the solid-liquid interval, the nucleation and growth process of the primary phase are changed by forced cooling, strong stirring, and addition of appropriate inoculants, etc., to obtain a Solid-liquid mixed slurry with fine grain, rounded particles and uniform distribution of structure.

Metal semi-solid forming technology was discovered and developed by Professor M.C.Flemings and Dr. David Spencer of the Massachusetts Institute of Technology in the 1970s. Semi-solid forming technology has the advantages of less structural segregation, high production efficiency, and less machining. , has been studied by many experts and teams at home and abroad, and mainly includes thixotropy and rheotropy. Thixotropic forming mainly refers to preparing the obtained semi-solid slurry into a billet, and then cutting according to the product size, reheating to the semi-solid temperature for molding; rheological forming refers to keeping the obtained semi-solid slurry at a temperature between solid and liquid Direct molding under certain conditions to obtain the required parts. Because thixoforming blanks are heated and transported conveniently, the molding process is easy to control, and it is convenient to realize automatic production, it has been applied in actual production. The scope is very limited. Due to the advantages of low cost, short production cycle, fine grains, less segregation, uniform structure distribution, and small shrinkage, rheological molding has been studied by many researchers. For example, the earliest inclined plate method invented by Japan, the low-temperature shear casting method of Professor Yang Xiangjie of Nanchang University, the inner taper method of Professor Mao Weimin of Beijing University of Science and Technology, and the rotary rod induced nucleation method of Professor Zhou Rongfeng of Kunming University of Science and Technology have all achieved excellent results. However, during the experiment, problems such as sticky material and uneven tissue distribution still existed, which made it impossible to continuously prepare semi-solid slurry.

Contents of the invention

The object of the present invention is to provide a compound type device for preparing semi-solid slurry, which includes a motor 1, a cooling device 4, a mold 5, a forming device 6, a gear 7, a screw conveying rod 8, a material blocking plate 9, an outer Barrel 10, graphite cone barrel 11, heating pipe 12, cooling pipe 13, fixed bearing 14, runner 15; the motor 1 is connected with the outer barrel 10 to drive the outer barrel 10 to rotate. Heating pipes 12 and cooling pipes 13 are arranged alternately on the side wall of the barrel 10; the runner 15 is located on the top of the graphite cone barrel 11, and the outlet is facing the inner wall of the graphite cone barrel 11; the bottom of the graphite cone barrel 11 communicates with the forming device 6 , the molding device 6 is connected to the lower end of the outer barrel 10; the inside of the molding device 6 and the bottom of the graphite cone barrel 11 are provided with a screw delivery rod 8, one end of the screw delivery rod 8 is connected with the gear 7, and the other end faces the mold 5, and the mold 5 is located inside the cooling device 4; the motor 1, the outer barrel 10, and the graphite cone barrel 11 are fixed on the frame of the equipment.

The motor 1 of the present invention is connected with the outer barrel 10 through the pulley 2 and the belt 3 .

The inner taper of the graphite cone 11 of the present invention is 0.5°~10°, the diameter of the lower port is 10mm~100mm, the height of the cone is 200mm~1000mm, and the wall thickness of the cone is 5mm~50mm.

The rotational speed of the outer barrel 10 and the graphite cone barrel 11 of the present invention is 100r~3000r.

The principle of the present invention is: after the superheated metal melt is heated to a predetermined temperature, it is poured directly against the inner wall of the graphite cone through the runner, and under the action of the centrifugal force of the cone and the gravity of the molten metal, the molten metal spreads around the inner wall of the cone and forms a Thickness of the melt film, under the forced supercooling of the graphite material and the cooling device, promotes the overall supercooling of the melt film, induces a large number of nucleation of primary phases inside the spread melt film, and the semi-solid slurry made is directly absorbed by the following The forming device collects the slurry and directly transports the slurry to the mold port through the screw conveying device. Under the forced cooling of the cooling device, the blank or finished product of a specific shape with a near-spherical or fine spherical microstructure is obtained.

Beneficial effects of the present invention:

(1) The device of the present invention can obtain a semi-solid slurry alloy with a uniform, small and round structure; the semi-solid alloy slurry prepared by the device has a certain degree of refinement in its microstructure, and the primary phase distribution is It is more uniform and the shape is closer to spherical.

(2) The rotating speed and the size of the conical graphite rod in the device of the present invention can be adjusted, and more reasonable parameters can be selected according to the specific experimental conditions in the experimental process;

(3) The device of the present invention can obtain a pure semi-solid alloy; in the process of preparing the semi-solid slurry, no inoculant such as a modifier is needed, and gas protection can be performed as required.

(4) The device of the present invention is simple in structure, low in cost, high in efficiency, and can continuously prepare semi-solid slurry, and combined with forming equipment, can directly obtain blanks or parts, reducing the cost of blank storage and other processes.

Description of drawings

Fig. 1 is the structural representation of the device for preparing semi-solid slurry in the present invention;

Fig. 2 is the microstructural figure of the semi-solid slurry that example 1 prepares Al-25%Si alloy;

Fig. 3 is the microstructure diagram of the semi-solid slurry of the Al-23%Si-4.5%Fe-3%Cu-1%Mg alloy prepared in Example 2.

In the figure: 1-electric motor, 2-belt pulley, 3-belt, 4-cooling device, 5-mould, 6-forming device, 7-gear, 8-screw conveying rod, 9-stopping plate, 10-outer barrel, 11-graphite cone barrel, 12-heating pipe, 13-cooling pipe, 14-fixed bearing, 15-runner.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the content described.

Example 1

The device for compound semi-solid slurry preparation described in this embodiment includes a motor 1, a cooling device 4, a mold 5, a forming device 6, a gear 7, a screw conveying rod 8, a baffle plate 9, an outer barrel 10, and a graphite cone barrel 11 , heating pipe 12, cooling pipe 13, fixed bearing 14, runner 15; the motor 1 is connected with the outer barrel 10 to drive the outer barrel 10 to rotate, the inside of the outer barrel 10 is inlaid with graphite cone barrels 11, and the side walls of the outer barrel 10 alternately A heating pipe 12 and a cooling pipe 13 are provided; the runner 15 is located on the top of the graphite cone barrel 11, and the outlet is facing the inner wall of the graphite cone barrel 11; the bottom of the graphite cone barrel 11 communicates with the forming device 6, and the forming device 6 and the outer barrel The lower end of 10 is connected; the inside of the molding device 6 and the bottom of the graphite cone barrel 11 are provided with a screw delivery rod 8, one end of the screw delivery rod 8 is connected with the gear 7, and the other end is facing the mold 5, and the mold 5 is located in the inside of the cooling device 4 ; Motor 1, outer barrel 10, graphite cone barrel 11 are fixed on the frame of the equipment, as shown in Figure 1.

The motor 1 in this embodiment is connected with the outer barrel 10 through the pulley 2 and the belt 3 .

The inner taper of the graphite cone 11 in this embodiment is 2°, the diameter of the lower port is 20 mm, the height of the cone is 200 mm, and the wall thickness of the cone is 10 mm.

The rotation speed of the outer barrel 10 and the graphite cone barrel 11 in this embodiment is 200r/min.

The device described in this embodiment is used to prepare the semi-solid slurry of Al-25%Si alloy, comprising the following steps:

(1) Mix the Al-25%Si alloy (liquidus temperature line 775°C, solidus line temperature 564°C) low superheated melt prepared by intermediate frequency furnace melting;

(2) Set up the process parameters: the speed of the graphite cone barrel is 200r/min, the inclination angle is 3° and the diameter of the lower port is 20mm; Under the action of the centrifugal force of the cylinder and the gravity of the molten metal, the melt spreads on the inner surface of the graphite cone barrel and flows downward in a spiral shape, and spreads on the inner wall of the graphite cone barrel to form a melt film with a certain thickness. Under cooling, the overall melt film is supercooled, and a large number of primary phases inside the spread melt film are induced to nucleate. The semi-solid slurry produced is directly collected by the molding device below, and the slurry is directly transported to the mold through the screw conveying rod. The port, under the forced cooling of the cooling device, obtains a billet of a specific shape with a near-spherical or fine spherical microstructure, as shown in Figure 2.

Example 2

The device for compound semi-solid slurry preparation described in this embodiment includes a motor 1, a cooling device 4, a mold 5, a forming device 6, a gear 7, a screw conveying rod 8, a baffle plate 9, an outer barrel 10, and a graphite cone barrel 11 , heating pipe 12, cooling pipe 13, fixed bearing 14, runner 15; the motor 1 is connected with the outer barrel 10 to drive the outer barrel 10 to rotate, the inside of the outer barrel 10 is inlaid with graphite cone barrels 11, and the side walls of the outer barrel 10 alternately A heating pipe 12 and a cooling pipe 13 are provided; the runner 15 is located on the top of the graphite cone barrel 11, and the outlet is facing the inner wall of the graphite cone barrel 11; the bottom of the graphite cone barrel 11 communicates with the forming device 6, and the forming device 6 and the outer barrel The lower end of 10 is connected; the inside of the molding device 6 and the bottom of the graphite cone barrel 11 are provided with a screw delivery rod 8, one end of the screw delivery rod 8 is connected with the gear 7, and the other end is facing the mold 5, and the mold 5 is located in the inside of the cooling device 4 ; Motor 1, outer barrel 10, graphite cone barrel 11 are fixed on the frame of the equipment, as shown in Figure 1.

The motor 1 in this embodiment is connected with the outer barrel 10 through the pulley 2 and the belt 3 .

The inner taper of the graphite cone 11 in this embodiment is 6°, the diameter of the lower port is 60 mm, the height of the cone is 600 mm, and the wall thickness of the cone is 40 mm.

The rotation speed of the outer barrel 10 and the graphite cone barrel 11 in this embodiment is 2000r/min.

The device described in this embodiment is used to prepare semi-solid slurry of Al-23%Si-4.5%Fe-3%Cu-1%Mg alloy, including the following steps:

(1) Mix the Al-23%Si-4.5%Fe-3%Cu-1%Mg alloy (liquidus temperature line 825°C, solidus line temperature 575°C) low superheated melt prepared by intermediate frequency furnace melting evenly ;

(2) Set the process parameters: the speed of the graphite cone barrel is 2000r/min, the inclination angle is 8° and the diameter of the lower port is 40mm. The above-mentioned low-superheat melt is poured at a constant speed against the graphite cone barrel. Under the action of the centrifugal force of the graphite cone barrel and the gravity of the molten metal, the melt spreads on the inner surface of the graphite cone barrel and flows downward in a spiral shape. The inner wall is spread into a melt film with a certain thickness. Under the forced supercooling of the graphite material and the cooling pipe, the melt film is overcooled as a whole, and a large number of primary phases inside the spread melt film are induced to nucleate to form a semi-solid slurry. The material is directly collected by the molding device below, and the slurry is directly transported to the mold port through the screw conveying rod, and under the forced cooling of the cooling device, a billet with a specific shape with a near-spherical or fine spherical microstructure is obtained, as shown in Figure 3 shown.

Example 3

The device for compound semi-solid slurry preparation described in this embodiment includes a motor 1, a cooling device 4, a mold 5, a forming device 6, a gear 7, a screw conveying rod 8, a baffle plate 9, an outer barrel 10, and a graphite cone barrel 11 , heating pipe 12, cooling pipe 13, fixed bearing 14, runner 15; the motor 1 is connected with the outer barrel 10 to drive the outer barrel 10 to rotate, the inside of the outer barrel 10 is inlaid with graphite cone barrels 11, and the side walls of the outer barrel 10 alternately A heating pipe 12 and a cooling pipe 13 are provided; the runner 15 is located on the top of the graphite cone barrel 11, and the outlet is facing the inner wall of the graphite cone barrel 11; the bottom of the graphite cone barrel 11 communicates with the forming device 6, and the forming device 6 and the outer barrel The lower end of 10 is connected; the inside of the molding device 6 and the bottom of the graphite cone barrel 11 are provided with a screw delivery rod 8, one end of the screw delivery rod 8 is connected with the gear 7, and the other end is facing the mold 5, and the mold 5 is located in the inside of the cooling device 4 ; The motor 1, the outer barrel 10, and the graphite cone barrel 11 are fixed on the frame of the equipment.

The motor 1 in this embodiment is connected with the outer barrel 10 through the pulley 2 and the belt 3 .

The inner taper of the graphite cone 11 in this embodiment is 10°, the diameter of the lower port is 90 mm, the height of the cone is 1000 mm, and the wall thickness of the cone is 20 mm.

The rotating speed of the outer barrel 10 and the graphite cone barrel 11 in this embodiment is 3000r/min.

Claims (4)

1. A compound device for preparing semi-solid slurry, characterized in that it includes a motor (1), a cooling device (4), a mold (5), a forming device (6), a gear (7), a screw conveying rod ( 8), baffle plate (9), outer barrel (10), graphite cone barrel (11), heating pipe (12), cooling pipe (13), fixed bearing (14), sprue (15); motor (1 ) is connected with the outer barrel (10) to drive the outer barrel (10) to rotate, the interior of the outer barrel (10) is inlaid with graphite cone barrels (11), and the side walls of the outer barrel (10) are alternately provided with heating pipes (12) and The cooling pipe (13); the sprue (15) is located above the graphite cone barrel (11), and the outlet is facing the inner wall of the graphite cone barrel (11); the bottom of the graphite cone barrel (11) communicates with the molding device (6), The forming device (6) is connected to the lower end of the outer barrel (10); the inside of the forming device (6) and the bottom of the graphite cone barrel (11) are provided with a screw delivery rod (8), and one end of the screw delivery rod (8) is connected to the gear (7) Connect, the other end faces the mold (5), and the mold (5) is located inside the cooling device (4); the motor (1), the outer barrel (10), and the graphite cone barrel (11) are fixed on the frame of the equipment superior. 2. The compound device for preparing semi-solid slurry according to claim 1, characterized in that the motor (1) is connected to the outer barrel (10) through a pulley (2) and a belt (3). 3. The compound device for preparing semi-solid slurry according to claim 1, characterized in that: the inner taper of the graphite cone barrel (11) is 0.5°~10°, the diameter of the lower port is 10mm~100mm, the cone barrel The height is 200mm~1000mm, and the thickness of the cone wall is 5mm~50mm. 4. The compound device for preparing semi-solid slurry according to claim 1, characterized in that: the rotating speed of the outer barrel (10) and the graphite cone barrel (11) is 100r~3000r.