Intelligent high-pressure casting equipment of speed-regulating pressurizing feeding system

Abstract

The invention discloses intelligent high-pressure casting equipment of a speed-regulating and pressurizing feeding system, and belongs to the technical field of casting, the intelligent high-pressure casting equipment of the speed-regulating and pressurizing feeding system comprises a mold base, a mold and a support mounting plate, a material cup is arranged at the bottom of the support mounting plate, the top of the material cup penetrates through the mold base and is connected to a liquid injection opening of the mold, and the mold base is connected with the support mounting plate; a support is fixedly installed at the bottom of the support installation plate, an upper supporting plate and a lower supporting plate are installed on the inner side of the support, a material cup moving oil cylinder is installed at the bottom of the lower supporting plate, an output shaft of the material cup moving oil cylinder is fixedly connected with a top plate, and a guide column is vertically and fixedly connected to the top plate. Molten aluminum can be conveyed into a material cup through inert gas by adopting mold locking force of a horizontal high-pressure casting machine, slow feeding and high-pressure upsetting can be achieved, the mechanical performance of a final casting is guaranteed, slow feeding is achieved through a control system, scouring of a high-pressure casting rapid feeding mode to a mold is reduced, and the service life of the mold is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of casting technology, and more specifically to an intelligent high-pressure casting device with a speed-regulating pressurized feeding system. Background Art

[0002] The high-pressure casting on the market is a process in which molten metal is poured into a pressure chamber, and then filled into the mold cavity at high speed and then crystallized and solidified under high pressure to form a casting. Among them, high pressure and high speed are important characteristics of high-pressure casting. The filling time is about 0.01 to 0.2 seconds, and the pressure of the molten metal during solidification is as high as 40 to 120 MPa. The time for the molten metal to fill the mold cavity is extremely short, and it has the advantages of good surface finish, stable dimensions, and the ability to directly form thin-walled structures.

[0003] At present, the products produced by conventional die-casting equipment are full of pores, and usually cannot be heat treated, and castings with high mechanical properties cannot be obtained. In addition, due to the fast filling speed of the molten metal, the mold is severely eroded, which reduces the service life of the mold.

[0004] Therefore, in view of this, the existing structure is studied and improved, and an intelligent high-pressure casting equipment with a speed-regulating pressurized feeding system is provided, in order to achieve a more practical purpose. Summary of the invention

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an intelligent high-pressure casting equipment with a speed-regulated pressurized feeding system, which can achieve slow feeding by adopting the clamping force of a horizontal high-pressure casting machine and delivering molten aluminum to a material cup through an inert gas, effectively exhausting the air in the mold cavity, and quickly pressurizing and forging after the molten aluminum fills the mold cavity, thereby improving the density of the organization and ensuring the mechanical properties of the final casting. By controlling the control system to feed slowly, the scouring of the mold by the fast feeding method of high-pressure casting is reduced, and the life of the mold is extended. At the same time, after the molten aluminum is filled, the top forging is quickly pressurized, which can effectively increase the density of the product.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] An intelligent high-pressure casting device with a speed-regulating pressurized feeding system comprises a mold base, a mold tooling installed on the mold base, and a bracket mounting plate installed below the mold tooling, wherein an aluminum liquid cup is arranged at the bottom of the bracket mounting plate, the top of the aluminum liquid cup passes through the mold base and is connected to the injection port of the mold tooling, a large bracket is fixedly installed at the bottom of the bracket mounting plate, an upper support plate is fixedly installed at the middle and upper inner side of the large bracket, a lower support plate is fixedly installed at the middle and lower inner side of the large bracket, a cup moving cylinder is installed at the bottom of the lower support plate, the output shaft of the cup moving cylinder passes through the lower support plate and is fixedly connected to a top plate, the top plate is arranged between the upper support plate and the lower support plate, and a guide column is vertically fixedly connected to the top plate;

[0010] A guide seat is fixedly installed at the middle and upper position of the side of the aluminum liquid cup, one end of the guide column movably passes through the upper support plate and is fixed at the bottom of the guide seat, one end of the aluminum liquid cup passes through the upper support plate and the lower support plate, and extends to the bottom of the lower support plate, the inner bottom of the aluminum liquid cup is slidably connected with a push rod, and a push rod is fixedly installed at the bottom of the push rod, and a feeding cylinder is installed at the bottom of the large bracket, and the output end of the feeding cylinder passes through the large bracket and is fixed to the bottom of the push rod.

[0011] Furthermore, heat insulation plates are fixedly installed between the mold base and the bracket mounting plate, between the material cup moving cylinder and the top plate, between the output shaft of the material cup moving cylinder and the lower support plate, and between the feeding cylinder and the bottom of the large bracket.

[0012] Furthermore, a steel piston head is fixedly mounted on the top end of the push rod, and the steel piston head is slidably connected to the inside of the aluminum liquid cup.

[0013] Furthermore, the top plate, the upper support plate and the lower support plate are all provided with through holes in the middle;

[0014] The guide posts are symmetrically arranged on both sides of the aluminum liquid cup.

[0015] Furthermore, a crucible furnace discharge pipe is connected to one side of the aluminum liquid cup, the crucible furnace discharge pipe is connected to the aluminum liquid cup, and the outlet of the crucible furnace discharge pipe is arranged at the upper end of the push rod, and the other end of the crucible furnace discharge pipe is arranged inclined upward.

[0016] Furthermore, the interior of the aluminum liquid cup is a sandwich structure, and the innermost side of the sandwich is a thermal insulation layer, and the thermal insulation temperature of the thermal insulation layer is greater than 800°C.

[0017] Furthermore, a material blocking valve is fixedly installed at the liquid injection port pipeline of the lower mold cavity.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] ① This solution adopts the clamping force of the horizontal high-pressure casting machine and delivers the molten aluminum to the material cup through inert gas to achieve slow feeding and effectively discharge the air in the mold cavity. After the molten aluminum fills the cavity, it is quickly pressurized and forged to improve the density of the organization and ensure the mechanical properties of the final casting. In addition, the control system is used to feed slowly, which reduces the scouring of the mold by the high-pressure casting fast feeding method, extends the mold life, and discharges the gas in the mold cavity in an orderly manner, avoiding the problem of easy gas nesting in the product in the high-pressure process. Then the push rod separates the product from the liquid lifting pipe, avoiding the problem of coarse product organization near the gate in the low-pressure process.

[0021] ② In this scheme, after the aluminum liquid fills the mold cavity, it is quickly pressurized and forged. The pressure is much greater than the pressure provided by the gas source of the low-pressure casting equipment. The pressure distribution is reasonably controlled by the hydraulic station to improve the density of the product structure. Combined with heat treatment, a casting product with high mechanical properties can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure diagram of the intelligent high-pressure casting equipment in the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The three-dimensional structure diagram of the intelligent high-pressure casting equipment in the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 It is a schematic diagram of the planar structure of the intelligent high-pressure casting equipment in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of loading molten aluminum into the molten aluminum cup in the present invention.

[0026] Description of the numbers in the figure:

[0027] 1. Mold tooling; 101. Material resistance valve; 2. Mold seat; 3. Aluminum liquid cup; 301. Guide seat; 302. Crucible furnace discharge pipe; 4. Heat insulation board; 5. Bracket mounting plate; 6. Guide column; 7. Upper support plate; 8. Cup moving cylinder; 9. Top plate; 901. Through hole; 10. Lower support plate; 11. Push rod; 1101. Steel piston head; 12. Push rod; 13. Feeding cylinder; 14. Large bracket. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] See also Figure 1-4 , an intelligent high-pressure casting device with a speed-regulated pressurized feeding system, comprising a mold base 2, a mold tooling 1 installed on the mold base 2, and a bracket mounting plate 5 installed below the mold tooling 1, an aluminum liquid cup 3 is arranged at the bottom of the bracket mounting plate 5, the top of the aluminum liquid cup 3 passes through the mold base 2 and is connected to the injection port of the mold tooling 1, a large bracket 14 is fixedly installed at the bottom of the bracket mounting plate 5, an upper support plate 7 is fixedly installed at the middle and upper inner side of the large bracket 14, a lower support plate 10 is fixedly installed at the middle and lower inner side of the large bracket 14, a cup moving cylinder 8 is installed at the bottom of the lower support plate 10, the output shaft of the cup moving cylinder 8 passes through the lower support plate 10, and is fixedly connected with a top plate 9, the top plate 9 is arranged between the upper support plate 7 and the lower support plate 10, and a guide column 6 is vertically fixedly connected to the top plate 9;

[0031] A guide seat 301 is fixedly installed at the middle and upper position of the side of the aluminum liquid cup 3, one end of the guide column 6 movably passes through the upper support plate 7 and is fixed at the bottom of the guide seat 301, one end of the aluminum liquid cup 3 passes through the upper support plate 7 and the lower support plate 10, and extends to the bottom of the lower support plate 10, the inner bottom of the aluminum liquid cup 3 is slidably connected with a push rod 11, and a push rod 12 is fixedly installed at the bottom of the push rod 11, and a feeding cylinder 13 is installed at the bottom of the large bracket 14, and the output end of the feeding cylinder 13 passes through the large bracket 14 and is fixed to the bottom of the push rod 12.

[0032] See also Figure 1 , Figure 2 and Figure 3 Specifically, a heat insulation board 4 is fixedly installed between the mold base 2 and the bracket mounting plate 5, between the material cup moving cylinder 8 and the top plate 9, between the output shaft of the material cup moving cylinder 8 and the lower support plate 10, and between the feeding cylinder 13 and the bottom of the large bracket 14.

[0033] The heat insulation board 4 is used to provide heat insulation to prevent the mold base 2, the material cup moving cylinder 8 and the feeding cylinder 13 from being damaged by high temperature.

[0034] See also Figure 4 Specifically, a steel piston head 1101 is fixedly installed on the top of the push rod 11, and the steel piston head 1101 is slidably connected to the inside of the aluminum liquid cup 3.

[0035] By moving the steel piston head 1101 , the aluminum liquid in the aluminum liquid cup 3 can be controlled to move upward until it is injected from the aluminum liquid cup 3 into the mold tooling 1 .

[0036] See also Figure 1 , Figure 2 and Figure 4 Specifically, a through hole 901 is provided in the middle of the top plate 9, the upper support plate 7 and the lower support plate 10; the through hole 901 is used to prevent the top plate 9, the upper support plate 7 and the lower support plate 10 from directly contacting the aluminum liquid cup 3, thereby reducing the speed at which the aluminum liquid cup 3 dissipates heat to the outside.

[0037] The guide posts 6 are symmetrically arranged on both sides of the aluminum liquid cup 3 .

[0038] See also Figure 1 , Figure 2 and Figure 4 Specifically, one side of the aluminum liquid cup 3 is connected to a crucible furnace discharge pipe 302, the crucible furnace discharge pipe 302 is connected to the aluminum liquid cup 3, and the outlet of the crucible furnace discharge pipe 302 is arranged at the upper end of the push rod 11, and the other end of the crucible furnace discharge pipe 302 is arranged to be inclined upward.

[0039] Controlling the discharge height and tilting state of the crucible furnace discharge pipe 302 can improve the convenience of the aluminum liquid in the crucible furnace discharge pipe 302 entering the aluminum liquid material cup 3.

[0040] See also Figure 4 Specifically, the interior of the aluminum liquid cup 3 is a sandwich structure, and the innermost side of the sandwich is a heat preservation and insulation layer, and the heat preservation and insulation temperature of the heat preservation and insulation layer is greater than 800° C. The heat preservation and insulation layer can reduce the heat loss of the aluminum liquid in the aluminum liquid cup 3.

[0041] See also Figure 4 Specifically, a material blocking valve 101 is fixedly installed at the injection port pipeline of the mold tooling 1. When the injection is completed, the material blocking valve 101 is closed to prevent the aluminum liquid inside the mold tooling 1 from flowing downward due to gravity.

[0042] Working principle:

[0043] First, the mold tooling is closed, and then the material cup moving cylinder 8 transports the aluminum liquid to the aluminum liquid material cup 3. Specifically, aluminum liquid is continuously injected into the aluminum liquid material cup 3 using the crucible furnace discharge pipe 302. At the same time, the feeding cylinder 13 pushes the push rod 12 to move, and the push rod 12 pushes the push rod 11 to move. Under the thrust of the steel piston head 1101, the aluminum liquid in the aluminum liquid material cup 3 moves upward, and the aluminum liquid is slowly transported from bottom to top into the mold tooling 1 in stages. At this time, the control system is used to slowly feed the material, which reduces the The rapid feeding method of high-pressure casting flushes the mold and extends the life of the mold. The staged and feeding direction settings are conducive to the smooth discharge of air in the mold from the mold core. When the aluminum liquid fills the mold tooling 1, close the material resistance valve 101, and then wait for the aluminum liquid to cool down, and perform pressurized top forging in the semi-solid state of the aluminum liquid. The top forging pressure can be adjusted according to the product shape structure, and finally until the aluminum liquid is completely cooled. When demolding, the demolding slope of the mold tooling 1 itself is used, and a release agent is added to reduce the difficulty of demolding.

[0044] Embodiment 2:

[0045] Based on the above embodiment 1, further description is given.

[0046] The specific steps of the process for producing a commercial vehicle latch bracket using the above high-voltage equipment are as follows:

[0047] Step 1: Degas and remove slag from the obtained liquid metal in the furnace with a high-efficiency refining agent to make the liquid metal clean and free of impurities;

[0048] Among them, the ratio of the modifier is determined to be 0.26 thousandths of the modifier. When the material is degraded and the aluminum ingot is melted for a long time or the temperature is too high, magnesium is easily lost. At this time, the magnesium content needs to be increased until the standard material ratio is reached.

[0049] Step 2: Heat the mold, control the pouring temperature to 710-730℃, quantitatively supply the molten material to the melting cup through the automatic liquid lifting system, quickly fill and forge at low pressure to prevent sticking, control the filling speed to 15cm / s, the forging pressure to 10MPa, continuously punch 7-8 molds, and preheat the mold temperature to 280-320℃;

[0050] Step 3: Cast the molten material into the metal mold, and the molten material is quantitatively supplied to the melting cup through the automatic liquid lifting system, and low-speed filling and high-pressure upsetting are performed. The pouring temperature is 710-730℃, and the single billet is precisely quantitatively poured. The liquid metal is pressurized by a hydraulic press; the pressurization is divided into two steps: A, mold closing and filling pressurization, B, pressure-maintaining die forging;

[0051] Among them, the mold closing and filling time in A is 20-30s, the speed is 8cm / S, and the pressure in B starts to change from the moment the upper die punch just touches the melt surface in the lower die to 31.5MPa, and the pressure is maintained for 30-40S;

[0052] Step 4: Open the mold, and the mold ejector pushes the workpiece to the right;

[0053] Step 5: Remove the workpiece from the mold, air cool it for 30 to 50 seconds, and then perform machining processes such as trimming and grinding;

[0054] Step 6: Heat treat the formed aluminum alloy product; the specific operation of heat treatment is carried out according to the selected ADC12 material and ZL101A material;

[0055] The heat treatment of ADC12 material includes the following steps:

[0056] 1) Heat the workpiece to 535°C and keep it warm for 6 hours;

[0057] 2) Use 65℃ water to cool the workpiece for 20 minutes;

[0058] 3) Heat the workpiece again to 155°C and keep it warm for 5 hours;

[0059] 4) Place the workpiece in air for air cooling.

[0060] The heat treatment of ZL101A material includes the following steps:

[0061] 1) Heat the workpiece to 540°C and keep it warm for 2.5 hours;

[0062] 2) Use 65℃ water to cool the workpiece for 20 minutes;

[0063] 3) Heat the workpiece again to 170°C and keep it warm for 3 hours;

[0064] 4) Place the workpiece in air for air cooling.

[0065] Step 7: Surface treatment of workpiece, shot blasting.

[0066] Step 8: Inspect and machine the mounting surfaces and threaded holes.

[0067] Step 9: Inspect packaging and put it into storage.

[0068] After testing, the intelligent high-voltage equipment was sampled from the product body produced by ADC12 material, and after multiple tests, the test results are as follows:

[0069]

[0070] Compared with similar ZL101A materials and products produced by low-pressure casting process after heat treatment, its tensile strength is 285Mpa, yield strength is 205Mpa, and elongation after break is about 6%. Therefore, its performance is inferior to that of products produced by this intelligent high-voltage equipment.

[0071] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An intelligent high-pressure casting device with a speed-regulating pressurized feeding system, comprising a mold base (2), a mold tooling (1) mounted on the mold base (2), and a bracket mounting plate (5) mounted below the mold tooling (1), characterized in that: An aluminum liquid material cup (3) is arranged at the bottom of the bracket mounting plate (5), the top of the aluminum liquid material cup (3) passes through the mold base (2) and is connected to the injection port of the mold tooling (1), a large bracket (14) is fixedly installed at the bottom of the bracket mounting plate (5), an upper support plate (7) is fixedly installed at the middle and upper inner side of the large bracket (14), a lower support plate (10) is fixedly installed at the middle and lower inner side of the large bracket (14), a material cup moving cylinder (8) is installed at the bottom of the lower support plate (10), the output shaft of the material cup moving cylinder (8) passes through the lower support plate (10) and is fixedly connected to a top plate (9), the top plate (9) is arranged between the upper support plate (7) and the lower support plate (10), and a guide column (6) is vertically fixedly connected to the top plate (9); A guide seat (301) is fixedly installed at the middle upper position of the side of the aluminum liquid cup (3); one end of the guide column (6) movably passes through the upper support plate (7) and is fixed below the guide seat (301); one end of the aluminum liquid cup (3) passes through the upper support plate (7) and the lower support plate (10) and extends to the bottom of the lower support plate (10); the inner bottom of the aluminum liquid cup (3) is slidably connected to a push rod (11); the bottom of the push rod (11) is fixedly installed with a push rod (12); the bottom of the large bracket (14) is installed with a feeding cylinder (13); the output end of the feeding cylinder (13) passes through the large bracket (14) and is fixed to the bottom of the push rod (12).

2. The intelligent high-pressure casting equipment with a speed-regulating and pressurized feeding system according to claim 1 is characterized in that: A heat insulation board (4) is fixedly installed between the mold base (2) and the bracket mounting plate (5), between the material cup moving cylinder (8) and the top plate (9), between the output shaft of the material cup moving cylinder (8) and the lower support plate (10), and between the feeding cylinder (13) and the bottom of the large bracket (14).

3. The intelligent high pressure casting equipment with a speed regulating and pressurized feeding system according to claim 1 is characterized in that: A steel piston head (1101) is fixedly mounted on the top end of the push rod (11), and the steel piston head (1101) is slidably connected to the inside of the aluminum liquid cup (3).

4. The intelligent high pressure casting equipment with a speed regulating and pressurized feeding system according to claim 1 is characterized in that: The top plate (9), the upper support plate (7) and the lower support plate (10) are all provided with through holes (901) in the middle. The guide columns (6) are symmetrically arranged on both sides of the aluminum liquid cup (3).

5. The intelligent high pressure casting equipment with a speed regulating and pressurized feeding system according to claim 1 is characterized in that: One side of the aluminum liquid material cup (3) is connected to a crucible furnace discharge pipe (302), the crucible furnace discharge pipe (302) is connected to the aluminum liquid material cup (3), and the outlet of the crucible furnace discharge pipe (302) is arranged at the upper end of the push rod (11), and the other end of the crucible furnace discharge pipe (302) is arranged to be inclined upward.

6. The intelligent high pressure casting equipment with a speed regulating and pressurized feeding system according to claim 1 is characterized in that: The interior of the aluminum liquid cup (3) is a sandwich structure, and the innermost side of the sandwich is a heat-insulating layer, and the heat-insulating temperature of the heat-insulating layer is greater than 800° C.

7. The intelligent high pressure casting equipment with a speed regulating and pressurized feeding system according to claim 1 is characterized in that: A material blocking valve (101) is fixedly installed at the liquid injection port pipeline of the mold tooling (1).

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