Aluminum alloy semi-solid die-casting process

Abstract

The invention discloses an aluminum alloy semi-solid die-casting process which comprises the following steps: firstly, heating a slurrying furnace to 550-610 DEG C, and putting refined and degassed aluminum alloy melt into the slurrying furnace; cooling the molten aluminum alloy in the slurrying furnace to 550-610 DEG C, and keeping the temperature; then a slurry taking device is adopted for taking slurry from the molten aluminum alloy in the slurrying furnace, the slurry taking device comprises a slurry bin capable of being closed, and the molten aluminum alloy is taken into the slurry bin through the slurry taking device; then the slurry taking device is shaken for 5-10 s, and then the molten aluminum alloy in the slurry bin is transferred into a pressure chamber of the injection mechanism; and finally, the injection mechanism is operated to push the molten aluminum alloy into the die-casting die. The aluminum alloy semi-solid pressure casting device has the remarkable effects that aluminum alloy melt can be prevented from making contact with air for a long time in the cooling and slurrying process, aluminum alloy slurry is prevented from making contact with air in the slurry taking process, the phenomena of oxidation and air suction in the aluminum alloy semi-solid pressure casting process are avoided as much as possible, and the forming quality of aluminum alloy pressure casting materials is improved.

Description

Technical Field

[0001] The invention relates to the technical field of semi-solid casting of light alloys, and in particular to a semi-solid die-casting process of aluminum alloys. Background Art

[0002] In the process of semi-solid die-casting of aluminum alloy, it is first necessary to manufacture semi-solid slurry of aluminum alloy, and then use the spoon of the slurry taking machine to take the slurry to deliver the semi-solid slurry of aluminum alloy to the pressure chamber of the injection device, and finally use the injection device to press the semi-solid slurry into a specific mold to form various castings.

[0003] Semi-solid slurrying processes for aluminum alloys include rheological slurrying, solid billet heating slurrying, and multi-station turntable barrel swing slurrying. Among them, rheological slurrying is relatively more flexible, the process is easy to control, and its application is relatively more extensive. Rheological slurrying is to first heat the aluminum alloy to a temperature close to the liquidus line and form a molten state, and then pour the molten liquid into a container and cool it to the semi-solid temperature range.

[0004] At present, during the cooling process of the molten metal and the slurry collection process with a spoon, the aluminum alloy liquid will come into contact with the air and oxidize and absorb air, resulting in poor molding quality of the die-casting material. Summary of the invention

[0005] In order to solve the problems of oxidation and air absorption of aluminum alloy liquid in the current rheological slurry making and slurry taking processes, the present invention provides a die-casting process, which can avoid the contact between aluminum alloy liquid and air as much as possible. The main technical solutions adopted are as follows:

[0006] A semi-solid die-casting process for aluminum alloys, the key of which is to proceed according to the following steps:

[0007] Step 1, heating the pulping furnace to 550-610° C., and adding the refined and degassed aluminum alloy melt into the pulping furnace;

[0008] Step 2: introducing cooling compressed air into the cooling device in the pulping furnace to cool the aluminum alloy melt to 550-610° C. and then maintain the temperature;

[0009] Step 3: using a slurry taking device to take slurry from the aluminum alloy melt in the slurry making furnace, wherein the slurry taking device comprises a closable slurry bin, and the slurry taking device takes the aluminum alloy melt into the slurry bin;

[0010] Step 4: Shake the slurry taking device for 5-10 seconds, and then transfer the aluminum alloy melt in the slurry bin to the pressure chamber of the injection mechanism;

[0011] Step 5: operate the injection mechanism to push the aluminum alloy melt into the die-casting mold.

[0012] In the above method, the aluminum alloy melt is transferred to a pulping furnace for cooling. The pulping furnace can remain relatively sealed to prevent the aluminum alloy melt from contacting the air for a long time during the cooling process. At the same time, the slurry taking device adopts a sealable slurry bin for taking materials, further preventing the aluminum alloy slurry from contacting the air during the slurry taking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the state of the pulp taking device when taking pulp from the pulping furnace. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with embodiments and drawings.

[0015] A semi-solid die-casting process for aluminum alloy is carried out in the following steps:

[0016] Step 1, heating the pulping furnace to 550-610° C., and adding the refined and degassed aluminum alloy melt into the pulping furnace;

[0017] Step 2: introducing cooling compressed air into the cooling device in the pulping furnace to cool the aluminum alloy melt to 550-610° C. and then maintain the temperature;

[0018] like Figure 1 As shown, the pulping furnace comprises a heat-insulating furnace body 9, a furnace cavity is arranged in the heat-insulating furnace body 9, a heating device 10 and a cooling device 8 are also arranged in the heat-insulating furnace body 9, the heating device 10 and the cooling device 8 are arranged around the furnace cavity, and the cooling device 8 is located above the heating device 10;

[0019] The heating device 10 is an electric heating device, and the cooling device 8 includes an air duct and heat dissipation fins fixed to the outer wall of the air duct. Both ends of the air duct extend out of the heat preservation furnace body 9.

[0020] A crucible 7 is arranged in the furnace chamber;

[0021] The heat-insulating furnace body 9 is further provided with a temperature-measuring thermocouple 11 , the sensing end of the temperature-measuring thermocouple 11 extends into the heat-insulating furnace body 9 , and the output end of the temperature-measuring thermocouple 11 extends to the outside of the heat-insulating furnace body 9 .

[0022] The heat-insulating furnace body 9 is provided with a furnace cover, which can be opened to expose the furnace cavity, and the furnace cover can be opened and closed.

[0023] Step 3: using a slurry taking device to take slurry from the aluminum alloy melt in the slurry making furnace, wherein the slurry taking device comprises a closable slurry bin, and the slurry taking device takes the aluminum alloy melt into the slurry bin;

[0024] The pulp collecting device comprises a pulp collecting cylinder 1, a pulp pushing piston 2, a pulp cylinder closing plate 3, a pulp pushing power assembly 4, a closing power assembly 5, and a pulp collecting frame 6;

[0025] The pulp taking cylinder 1, the pulp pushing power assembly 4, and the closed power assembly 5 are installed on the pulp taking frame 6. The two ends of the pulp taking cylinder 1 are open. The pulp pushing piston 2 is arranged in the pulp taking cylinder 1 and can slide in a sealed manner along the axial direction thereof.

[0026] The power output end of the slurry pushing power assembly 4 extends from the rear end of the slurry taking cylinder 1 and is connected to the slurry pushing piston 2;

[0027] The head cover of the pulp taking cylinder 1 is provided with the pulp cylinder closing plate 3, and the pulp cylinder closing plate 3 is connected to the power output end of the closed power assembly 5;

[0028] The space enclosed by the slurry taking cylinder 1, the slurry pushing piston 2, and the slurry cylinder closing plate 3 forms the slurry bin;

[0029] The pusher power assembly 4 and the closed power assembly 5 are both cylinder assemblies. The pusher power assembly 4 and the closed power assembly 5 can adopt linearly propelled cylinder assemblies.

[0030] The slurry taking cylinder 1 is kept in a vertical state when taking slurry, and takes slurry from the aluminum alloy melt in the slurry making furnace from above.

[0031] The pulp collecting device is equipped with a robot arm, and the execution end of the robot arm is fixedly connected to the pulp collecting frame 6.

[0032] Step 4: Taking the center line of the slurry taking tube 1 as a reference, shake the slurry taking device within an angle range of 5-30° for 5-10 seconds to break the slurry dendrites and refine the grain size; then transfer the aluminum alloy melt in the slurry bin to the pressure chamber of the injection mechanism;

[0033] Step 5: operate the injection mechanism to push the aluminum alloy melt into the die-casting mold.

[0034] In the step four, the feed port in the pressure chamber is opened vertically upward; when the slurry tube 1 transfers the aluminum alloy melt into the pressure chamber, the angle between the center line of the slurry tube 1 and the horizontal direction is 50-90°, and the distance between the head of the slurry tube 1 and the feed port in the pressure chamber is 0-30mm.

[0035] Beneficial effect: The technical solution of the present invention can prevent the aluminum alloy melt from contacting with air for a long time during the cooling and slurrying process, and prevent the aluminum alloy slurry from contacting with air during the slurrying process, thereby avoiding oxidation and air absorption during the semi-solid die-casting of the aluminum alloy as much as possible, and improving the molding quality of the aluminum alloy die-casting material.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A semi-solid die-casting process for aluminum alloy, characterized in that Follow these steps: Step 1, heating the pulping furnace to 550-610° C., and adding the refined and degassed aluminum alloy melt into the pulping furnace; Step 2: introducing cooling compressed air into the cooling device in the pulping furnace to cool the aluminum alloy melt to 550-610° C. and then maintain the temperature; Step 3: using a slurry taking device to take slurry from the aluminum alloy melt in the slurry making furnace, wherein the slurry taking device comprises a closable slurry bin, and the slurry taking device takes the aluminum alloy melt into the slurry bin; Step 4: Shake the slurry taking device for 5-10 seconds, and then transfer the aluminum alloy melt in the slurry bin to the pressure chamber of the injection mechanism; Step 5: operate the injection mechanism to push the aluminum alloy melt into the die-casting mold.

2. The aluminum alloy semi-solid die-casting process according to claim 1, characterized in that: The pulping furnace comprises a heat-insulating furnace body (9), a furnace cavity is arranged in the heat-insulating furnace body (9), a heating device (10) and a cooling device (8) are also arranged in the heat-insulating furnace body (9), the heating device (10) and the cooling device (8) are arranged around the furnace cavity, and the cooling device (8) is located above the heating device (10); A crucible (7) is arranged in the furnace chamber; The heat-insulating furnace body (9) is also provided with a temperature-measuring thermocouple (11), the sensing end of the temperature-measuring thermocouple (11) extends into the heat-insulating furnace body (9), and the output end of the temperature-measuring thermocouple (11) extends outside the heat-insulating furnace body (9).

3. The aluminum alloy semi-solid die-casting process according to claim 1, characterized in that: The pulp collecting device comprises a pulp collecting cylinder (1), a pulp pushing piston (2), a pulp cylinder closing plate (3), a pulp pushing power assembly (4), a closing power assembly (5), and a pulp collecting frame (6); The pulp collecting cylinder (1), the pulp pushing power assembly (4), and the closed power assembly (5) are installed on the pulp collecting frame (6); both ends of the pulp collecting cylinder (1) are open; the pulp pushing piston (2) is arranged in the pulp collecting cylinder (1) and can slide in a sealed manner along the axial direction thereof; The power output end of the slurry pushing power assembly (4) extends from the rear end of the slurry taking cylinder (1) and is connected to the slurry pushing piston (2); The head cover of the pulp taking cylinder (1) is provided with the pulp cylinder closing plate (3), and the pulp cylinder closing plate (3) is connected to the power output end of the closed power component (5); The space enclosed by the pulp taking cylinder (1), the pulp pushing piston (2) and the pulp cylinder closing plate (3) forms the pulp bin.

4. The aluminum alloy semi-solid die casting process according to claim 1, characterized in that: The pusher power assembly (4) and the closed power assembly (5) are both cylinder assemblies.

5. The aluminum alloy semi-solid die casting process according to claim 3 or 4, characterized in that: In the step three, the slurry taking cylinder (1) is kept in a vertical state to take slurry from the aluminum alloy melt in the slurry making furnace.

6. The aluminum alloy semi-solid die casting process according to claim 3 or 4, characterized in that: In the step 4, the slurry collecting device is shaken within an angle range of 5-30° with the center line of the slurry collecting tube (1) as a reference.

7. The aluminum alloy semi-solid die casting process according to claim 3 or 4, characterized in that: The pulp collecting device is provided with a robot arm, and the execution end of the robot arm is fixedly connected to the pulp collecting frame (6).

8. The aluminum alloy semi-solid die casting process according to claim 3 or 4, characterized in that: In the step 4, the feed port in the pressing chamber is opened vertically upward; When the slurry taking cylinder (1) transfers the aluminum alloy melt into the pressure chamber, the angle between the center line of the slurry taking cylinder (1) and the horizontal direction is 50-90°, and the distance between the head of the slurry taking cylinder (1) and the feed port in the pressure chamber is 0-30 mm.

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