CN108372277B - A device for preparing metal semi-solid slurry - Google Patents

Abstract

A device for preparing metal semi-solid slurry belongs to the technical field of metal semi-solid processing, and comprises: support subassembly, motor, bearing, stirring subassembly, crystallization section of thick bamboo subassembly and material cup. According to the invention, the metal liquid poured close to the center is thrown to the inner wall of the vertical cylinder through the rotary centrifugal force of the rotary table in the device, and is strongly stirred by a plurality of stirring columns in the process of transferring and falling from the center to the edge, and meanwhile, the metal semi-solid slurry is prepared by cooling and crystallizing. The metal semi-solid slurry prepared by the preparation device has fine crystal grains and uniform quality, and the quantity of the dispersed falling coil gas of the slurry is obviously reduced. Meanwhile, the preparation device is simple in structure, convenient to operate and control, high in production efficiency and particularly suitable for preparing various light alloy semi-solid slurry.

Description

A device for preparing metal semi-solid slurry

technical field

The invention belongs to the technical field of metal semi-solid processing, and relates to a preparation device of metal semi-solid slurry.

Background technique

Since the early 1970s, researchers such as M.C. Flemings of the Massachusetts Institute of Technology created the concept of metal semi-solid forming, and the preparation and forming technology of semi-solid metal paste has attracted widespread attention from all over the world as a new technology. Semi-solid processing is a method of forming using the characteristics of metals during the transition from liquid to solid or from solid to liquid (that is, the coexistence of liquid and solid). This new forming method combines the strengths of solidification processing and plastic processing. That is, the processing temperature is lower than that of the liquid state, the filling is stable, and the thermal impact on the mold is small; the deformation resistance is smaller than that of the solid state, which is conducive to the formation of more complex parts and reduces power consumption and improves production efficiency.

Semi-solid forming technology mainly includes thixoforming and rheoforming. The thixotropic forming process is to cast the prepared semi-solid slurry into a blank first, and then perform forming processing after secondary heating. The process is highly controllable, stable and easy to operate, but the process is long and energy-consuming. Larger and more expensive. The rheological forming process is carried out by the prepared semi-solid slurry. It has the characteristics of short production process, relatively low cost and simple equipment. It has been widely valued at home and abroad in recent years and has developed rapidly. Both thixotropic and rheological forming include semi-solid pulping and semi-solid forming.

At present, the commonly used methods for preparing metal semi-solid rheological forming slurry mainly include mechanical stirring method, electromagnetic stirring method, double helix stirring method, vibration method, single roller rotation method, spray deposition method, inclined cooling plate method, rotating conveying pipe method, turbulence effect method, liquid mixing method, etc. These processes can be broadly classified into two categories: stirred and flow. The biggest disadvantage of the stirring pulping method is that the quality of the slurry is not uniform enough, and once the motion balance is established, the shearing effect will drop sharply; while the biggest disadvantage of the flow pulping method is that it mostly relies on gravity flow, and its shear strength is relatively small. The slurry effect is not ideal. In addition, these two types of pulping methods have the common disadvantage of large air volume, which affects the practical application of the process.

Contents of the invention

The purpose of the present invention is to provide a metal semi-solid slurry preparation device that refines the metal semi-solid slurry grains and improves the uniformity of slurry treatment and reduces the gas content of the slurry. It is forced to stir and flow through the comprehensive stirring pulping method The uniform and high-efficiency advantages of the traditional pulping method, and effectively overcome the shortcomings of the above-mentioned pulping method with large air volume.

The present invention is achieved through the following technical solutions.

A device for preparing metal semi-solid slurry according to the present invention, comprising: bracket assembly (1), motor (8), bearing (9), stirring assembly (10), crystallization cylinder assembly (14), material cup ( 18). The motor (8) is directly fixed on the top plate (4) of the support assembly (1), the bearing (9) is placed in the bearing seat (5) of the support assembly (1), and the stirring assembly (10) is placed through the bearing (9) The bracket assembly (1) is connected with the motor (8), the crystallization cylinder assembly (14) is placed on the bracket assembly (1) under the limit of the limit plate (6) and the support of the loose block (7), and the material cup (18) Place it on the bottom plate (2) of the bracket assembly (1) and directly below the crystallization cylinder assembly (14) to hold the slurry.

The bracket assembly (1) of the present invention comprises: a bottom plate (2), a vertical plate (3), a top plate (4), a bearing seat (5), a limiting plate (6), and a movable block (7). The two vertical plates (3) are fixed on the bottom plate (2), and the top plate (4) is fixed on the two vertical plates (3) to form a rectangular bracket. The bearing seat (5) is fixed under the top plate (4). The positioning plate (6) is fixed between the two vertical plates (3), and the two movable blocks (7) are respectively hinged on both sides of the limiting plate (6).

The stirring assembly (10) of the present invention includes: a rotating shaft (11), a turntable (12), and a stirring column (13). The turntable (12) is fixed on the bottom end of the rotating shaft (11), and the stirring column (13) is fixed on the turntable (12) for stirring the slurry.

The crystallization cylinder assembly (14) of the present invention includes: a vertical cylinder (15), an electric heating rod (16), and a thermocouple (17). Four heating rods (16) and thermocouples (17) are put into the corresponding holes of the vertical tube (15).

Beneficial effects of the present invention.

(1) This device is forced to stir and shear the molten metal during its flow process. Compared with the current flow pulping method that only relies on gravity, the shear strength is more intense and the efficiency is higher, which can greatly improve the semi-solid slurry. The effect of grain refinement and the uniformity of slurry quality are improved; compared with the current overall stirring pulping method, due to the higher stirring disorder, the effect of grain refinement is better, and at the same time, the flow pulping method The advantage of good slurry quality uniformity.

(2) Since the slurry in this device falls into the material cup in a dispersed manner, the amount of entrained air is significantly reduced compared with other pulping methods.

(3) The device is simple in structure, easy to operate, and easy to realize automatic continuous production.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device. Among them, 1 is the bracket assembly; 2 is the bottom plate; 3 is the vertical plate; 4 is the top plate; 5 is the bearing seat; 6 is the limit plate; 7 is the movable block; 8 is the motor; 9 is the bearing; 12 is a turntable, 13 is a stirring column; 14 is a crystallization cylinder assembly; 15 is a vertical cylinder; 16 is an electric heating rod; 17 is a thermocouple; 18 is a material cup.

Detailed ways

The present invention is described in detail below in conjunction with the examples, it is necessary to point out that the present examples are only used to further illustrate the present invention, and can not be interpreted as limiting the protection scope of the present invention. Any simple modifications, alterations and equivalent structural changes still fall within the protection scope of the technical solution of the present invention.

In this example, the device for preparing metal semi-solid slurry includes: a support assembly 1 , a motor 8 , a bearing 9 , a stirring assembly 10 , a crystallization cylinder assembly 14 , and a material cup 18 . The motor 8 is directly fixed on the top plate 4 of the support assembly 1, the bearing 9 is put into the bearing seat 5 of the support assembly 1, the stirring assembly 10 is put into the support assembly 1 through the bearing 9 and connected with the motor 8, and the crystallization cylinder assembly 14 is limited. Placed on the support assembly 1 under the limit of the position plate 6 and the support of the movable block 7, the material cup 18 is placed on the bottom plate 2 of the support assembly 1 and directly below the crystallization cylinder assembly 14 to hold the slurry.

The bracket assembly 1 includes: a bottom plate 2 , a vertical plate 3 , a top plate 4 , a bearing seat 5 , a limiting plate 6 , and a movable block 7 . Two vertical plates 3 are fixed on the bottom plate 2, and the top plate 4 is fixed on the two vertical plates 3 to form a rectangular bracket. The bearing seat 5 is fixed under the top plate 4, and the limit plate 6 is fixed between the two vertical plates 3 , two movable blocks 7 are respectively hinged on both sides of the limiting plate 6 .

The stirring assembly 10 includes: a rotating shaft 11 , a turntable 12 , and a stirring column 13 . The turntable 12 is fixed on the bottom end of the rotating shaft 11, and the stirring column 13 is fixed on the turntable 12 for stirring the slurry.

The crystallization cylinder assembly 14 includes: a vertical cylinder 15 , an electric heating rod 16 , and a thermocouple 17 . Four electric heating rods 16 and thermocouples 17 are put into the corresponding holes of the vertical tube 15 .

The working process of the device for preparing semi-solid metal slurry includes the process of device preparation, slurry preparation and device cleaning.

The semi-solid slurry was prepared by taking the aluminum alloy A356 material as an example. The chemical composition of the alloy is: Si-6.9%, Mg-0.35%, Fe-0.09%, Cu-0.01%, Mn-0.02%, and the rest is Al. The alloy has a liquidus temperature of 615°C and a solidus temperature of 574°C. The specific process is as follows.

1. Preliminary preparation. Lift the crystallization cylinder assembly 14 along the inner wall of the limit plate 6 to the top of the movable block 7, turn the two movable blocks 7 90° to support the crystallization cylinder assembly 14, and place the material cup 18 on the bottom plate 2. Crystallization cylinder assembly 14 Directly below. Start the electric heating rod 16 and measure the temperature through the thermocouple 17 to heat the crystallization cylinder assembly 14 to 400° C. and then keep it warm. The A356 billet was smelted and refined in a smelting and holding furnace, cooled to 645°C, held for 15 minutes and poured with a pouring ladle; the pouring ladle was preheated to 620°C.

2. Slurry preparation. Turn on the motor 8, set the speed at 1000 rpm, and pour the smelted molten metal at 645°C close to the rotating shaft 11 above the stirring assembly 10, so that the molten metal is thrown to the inner wall of the vertical cylinder 15 under the centrifugal force of the rotation of the turntable 12, and the metal In the process of transferring and falling from the center to the edge, the liquid is strongly stirred by a plurality of stirring columns 13, and at the same time, the temperature is cooled and crystallized to form a metal semi-solid slurry. The slurry eventually falls into the cup 18 for transfer.

3. Device cleaning. Shut down and cut off the power, take away the material cup 18, and after the device cools down, turn the two movable blocks 7 90° to make the crystallization cylinder assembly 14 fall to the bottom plate 2 smoothly, at this time, the turntable 12 and the stirring column 13 are exposed, and the turntable can be turned 12. The inner walls of the stirring column 13 and the vertical cylinder 15 are cleaned.

Claims (1)

1. The device for preparing the metal semi-solid slurry is characterized by comprising a bracket component (1), a motor (8), a bearing (9), a stirring component (10), a crystallization barrel component (14) and a material cup (18); the motor (8) is directly fixed on the top plate (4) of the bracket assembly (1), the bearing (9) is placed in the bearing seat (5) of the bracket assembly (1), the stirring assembly (10) is placed in the bracket assembly (1) through the bearing (9) and connected with the motor (8), the crystallization barrel assembly (14) is placed on the bracket assembly (1) under the limit of the limit plate (6) and the support of the movable block (7), and the material cup (18) is placed on the bottom plate (2) of the bracket assembly (1) and is positioned under the crystallization barrel assembly (14) to contain slurry;

the bracket assembly (1) comprises: the device comprises a bottom plate (2), a vertical plate (3), a top plate (4), a bearing seat (5), a limiting plate (6) and a movable block (7); the two vertical plates (3) are fixed on the bottom plate (2), the top plate (4) is fixed on the two vertical plates (3) again to form a rectangular bracket, the bearing seat (5) is fixed below the top plate (4), the limiting plate (6) is fixed between the two vertical plates (3), and the two movable blocks (7) are respectively hinged on two sides of the limiting plate (6);

the stirring assembly (10) comprises: a rotating shaft (11), a rotating disc (12) and a stirring column (13); the rotary table (12) is fixed at the bottom end of the rotary shaft (11), and the stirring column (13) is vertically fixed on the rotary table (12) to stir the slurry;

the crystallization cylinder assembly (14) comprises: a vertical cylinder (15), an electric heating rod (16) and a thermocouple (17); four electric heating rods (16) and thermocouples (17) are placed in corresponding holes of the vertical cylinder (15);

and pouring molten metal above the stirring assembly (10) near the rotating shaft (11) so that the molten metal is thrown to the inner wall of the vertical cylinder (15) under the rotating centrifugal force of the rotary table (12), and the molten metal is strongly stirred by a plurality of stirring columns (13) in the process of transferring from the center to the edge and falling, and is cooled and crystallized to prepare the metal semi-solid slurry.

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