An integrated die-casting mold for a magnesium alloy backplane

Abstract

The present invention discloses an integrally die-cast mold for a magnesium alloy backplane, belonging to the technical field of metal casting equipment. The bottom of the fourth support plate is fixedly connected to the upper mold through a plurality of second connecting rods. Cores are respectively arranged on both sides of the bottom of the upper mold. A cooling mechanism is arranged at the bottom of the fourth support plate. The bottom of a plurality of fixed sleeves is provided with a lower mold, and cavities are respectively arranged on both sides of the lower mold. In the present invention, a vacuum cavity is respectively reserved between the two cores at the bottom of the upper mold and the cavities on the lower mold. The support mechanism supports the upper mold and the lower mold. The vacuum pumping mechanism pumps the air inside the vacuum cavity. The molten magnesium alloy is die-cast and flows into the cavity to form a magnesium alloy backplane casting. The cores are cooled by circulating cooling. After cooling, a plurality of ejector pins on the ejector plate eject the magnesium alloy backplane casting in the cavity, facilitating the demolding of the magnesium alloy backplane casting, reducing the defects of the die-cast part, improving the forming quality of the die-cast part and the overall density of the die-cast part. The present invention has the advantage of a high finished product rate of the die-cast part.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal casting equipment, and particularly relates to an integrated die-casting mold for a magnesium alloy backplane. Background Art

[0002] Magnesium alloy is the lightest material among metal engineering structural materials. Magnesium alloy has the advantages of low density, high specific stiffness, high specific strength, excellent shock absorption, stability, electromagnetic shielding, and environmental friendliness. Magnesium alloy is widely used in the lightweight of industries such as machinery, automobiles, and aerospace. For example, large-size displays in automobiles require large-size, high-strength, and high-rigidity backplanes to ensure the normal operation of the displays during driving on various road conditions. Currently, the material of in-vehicle large screens is aluminum alloy, but the aluminum alloy material is heavy. Therefore, a magnesium alloy die-cast backplane is needed to avoid the problems of poor strength and rigidity, easy deformation, and poor heat dissipation effect of plastic backplanes.

[0003] There are many influencing factors in the die-casting process of magnesium alloy backplanes. Since the filling speed of the molten metal is extremely fast, the gas in the cavity often has no time to escape during this period. Moreover, during the filling process of the molten metal, due to the extremely high speed of movement, turbulent flow is likely to occur, and it is easy to entangle and enclose the residual gas. During solidification under rapid cooling, shrinkage porosity or shrinkage cavities are formed due to lack of feeding in time, reducing the tissue density of the die-cast part. As a result, ordinary die-cast parts generally cannot be subjected to subsequent heat treatment. Otherwise, the internal pores expand during the heating process, reducing the density of the casting and making the pores on the surface of the casting larger, affecting the product accuracy and surface quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned disadvantages of the prior art and provide an integrated die-casting mold for a magnesium alloy backplane that can improve the forming quality of die-cast parts and the overall density of die-cast parts.

[0005] The technical solution adopted to solve the above technical problems is as follows: A plurality of support columns are provided on the fifth support plate. A third support plate is provided on the tops of the plurality of support columns. A first electric cylinder for driving the fourth support plate to move vertically along the support columns is provided on the third support plate. The bottom of the fourth support plate is fixedly connected to the upper mold through a plurality of second connecting rods. The upper mold is located below the fourth support plate. Core molds are respectively provided on both sides of the bottom of the upper mold. Baffle plates located above the core molds are respectively provided on both sides above the upper mold. A cooling cavity is formed between the baffle plates and the core molds. A cooling mechanism for communicating with the cooling cavity is provided at the bottom of the fourth support plate; A plurality of fixed sleeves are provided on the upper side of the fifth support plate. A lower mold is provided on the tops of the plurality of fixed sleeves. The lower mold is located above the fifth support plate. The lower mold is located below the upper mold. Cavities located below the core molds are respectively provided on both sides of the lower mold. Two first through holes communicating with the output end of the pipeline are provided on the lower mold. The pipeline is filled with molten magnesium alloy. First feeding ports are respectively machined on the circumferential side walls of each first through hole. A runner communicating with the first feeding ports is machined inside the lower mold. Second feeding ports communicating with the runner are respectively machined inside each cavity. The molten magnesium alloy in the pipeline flows into the cavities in sequence through the first feeding ports, the runner, and the second feeding ports to be die-cast into magnesium alloy backplane castings.

[0006] Further, positioning rods are respectively provided inside each of the fixed sleeves. A sliding sleeve is slidably connected to each positioning rod in the vertical direction. A plurality of second through holes penetrated by the positioning rods are machined on the lower mold. A fifth spring is respectively provided on each positioning rod. One end of each fifth spring is fixedly connected to the top end of the sliding sleeve. The other end of each fifth spring is respectively fixedly connected to the inside of the second through hole. A plurality of positioning holes respectively clamped with the positioning rods are machined on the upper mold.

[0007] Further, the cooling mechanism is as follows: A first fixing plate and a second fixing plate are provided at the bottom of the fourth support plate. A cooling pipe is provided on the first fixing plate. The input end of the cooling pipe is communicated with the output end of the chiller. The output end of the cooling pipe is communicated with the input end of the cooling cavity. A circulation pipe is provided on the second fixing plate. The output end of the cooling cavity is communicated with the input end of the circulation pipe. The output end of the circulation pipe is communicated with the input end of the chiller.

[0008] Further, first side plates are respectively provided on both sides of the upper mold. A support mechanism for fixing the upper mold and the lower mold is provided on the first side plates. A vacuum cavity is formed between the core mold at the bottom of the upper mold and the cavity on the lower mold. Second side plates are respectively provided on both sides of the lower mold. A vacuum pumping mechanism for pumping the inside of the vacuum cavity is provided on the second side plates. Pressure plates in contact with the vacuum pumping mechanism are respectively provided on the first side plates.

[0009] Furthermore, the support mechanism is as follows: shells are respectively arranged at both ends of the first side plate. A motor for driving the connection disk to rotate is arranged on the first side plate. The connection disk is eccentrically connected with the first connecting rod. Both ends of the first connecting rod are respectively connected with the first connecting shafts. Second connecting shafts are fixedly installed at both ends of each first connecting shaft. Each second connecting shaft is fixedly connected with the first connecting plate. Each first connecting plate is fixedly connected with the third connecting shaft. Cams are fixedly installed on each third connecting shaft. Each third connecting shaft is rotatably connected to the inside of the shell. A sliding rod is slidably connected to the inner bottom of each shell in the vertical direction. A first contact plate for contacting the cam is arranged at the top of each sliding rod. A first support plate for contacting the horizontal plane of the second side plate is arranged at the bottom of each sliding rod. The first support plate is located outside the shell. A first spring is arranged on each sliding rod. One end of each first spring is fixedly connected to the inner bottom of the shell, and the other end of each first spring is in contact connection with the first contact plate.

[0010] Furthermore, the vacuum pumping mechanism is as follows: an air passage communicating with a plurality of vacuum cavities is machined inside the lower mold. A vacuum generator communicating with the air passage is arranged on the second side plate. Second support plates are fixedly installed on both sides of the second side plate. A plurality of second sliding rods are slidably connected to each second support plate in the vertical direction. The top of each second sliding rod is in contact with the bottom of the pressing plate. The bottoms of the plurality of second sliding rods are fixedly connected to the sliding plate. A third spring is arranged on each second sliding rod. One end of each third spring is fixedly connected to the top of the second sliding rod, and the other end of each third spring is fixedly connected to the second support plate. A third sliding rod is slidably connected to each second support plate in the horizontal direction. A second contact plate for contacting the sliding plate is arranged at one end of each third sliding rod. The other end of each third sliding rod is fixedly connected to a plurality of second sealing columns through the second connecting plate. Each second sealing column is slidably connected to the air passage. A fourth spring is arranged on each third sliding rod. One end of each fourth spring is fixedly connected to the second contact plate, and the other end of each fourth spring is fixedly connected to the second support plate; A plurality of second electric cylinders are arranged on the fifth support plate. The output end of each second electric cylinder is fixedly connected to the first sealing column through the third connecting plate. The first sealing column is slidably connected to the first through hole in the vertical direction. The first sealing column blocks the communication between the flow channel and the first through hole. A plurality of fixing rods are fixedly installed at the bottom of the lower mold. The third connecting plate is slidably connected to the plurality of fixing rods in the vertical direction. A second spring is arranged on each fixing rod. One end of each second spring is fixedly connected to the bottom of the lower mold, and the other end of each second spring is fixedly connected to the third connecting plate.

[0011] Further, the sliding plate is fixedly connected by a horizontal plate, a first vertical plate, a first inclined plate, a second vertical plate, a second inclined plate and a third vertical plate. A first vertical plate is arranged on one side of the horizontal plate. The first vertical plate is successively provided with a first inclined plate, a second vertical plate, a second inclined plate and a third vertical plate from bottom to top. The perpendicular bisectors of the first vertical plate, the second vertical plate and the third vertical plate are parallel to each other. The perpendicular bisectors of the first vertical plate and the third vertical plate are the same vertical line. The second vertical plate is respectively located on one side of the first vertical plate and the third vertical plate. The first vertical plate, the second vertical plate and the third vertical plate respectively abut against the second abutting plate.

[0012] Further, third electric cylinders are respectively arranged on both sides of the fifth support plate. The output ends of the third electric cylinders are respectively fixedly connected to the top template. A plurality of top die heads for ejecting the magnesium alloy backplane castings formed in the cavity are arranged on the top template.

[0013] Further, a first support frame is arranged on one side of the fifth support plate. A melting furnace is arranged on the first support frame. There is molten magnesium alloy liquid in the melting furnace. The output end of the melting furnace is communicated with the input end of the pipeline. A hydraulic cylinder for pushing the molten magnesium alloy liquid in the melting furnace into the pipeline is arranged on the melting furnace.

[0014] The beneficial effects of the present invention are as follows: (1) In the present invention, two core molds at the bottom of the upper mold and the cavity on the lower mold respectively reserve vacuum cavities. The support mechanism supports the upper mold and the lower mold, and the vacuum pumping mechanism pumps the air inside the vacuum cavity. The magnesium alloy melt is pressure-cast and flows into the cavity to form a magnesium alloy backplane casting. During the die-casting process, the cold water of the chiller circulates and cools the core molds. After cooling, multiple ejector pins on the ejector plate push out the magnesium alloy backplane casting in the cavity, facilitating the demolding of the magnesium alloy backplane casting, reducing the defects of the die-cast part, improving the forming quality of the die-cast part and the overall density of the die-cast part. The present invention has the advantage of a high finished product rate of the die-cast part; (2) The present invention adopts an air channel that communicates with the vacuum cavity, and the first feed port, the runner, and the second feed port do not communicate with the vacuum cavity. The vacuum cavity and the runner are in a closed state. The vacuum generator evacuates the inside of the vacuum cavity through the air channel, discharging a large amount of gas before the magnesium alloy melt enters the vacuum cavity to make it in a certain vacuum state. The amount of gas is reduced, and the phenomenon of gas entrapment can be reduced during the filling process, reducing the generation of internal pores and shrinkage defects in the magnesium alloy backplane casting, improving the overall density and casting quality of the magnesium alloy backplane casting, and reducing the casting rejection rate; (3) In the present invention, the magnesium alloy melt in the pipeline sequentially enters the vacuum cavity through the first through hole, the first feed port, the runner, and the second feed port. The output end of the first electric cylinder continues to push the two core molds at the bottom of the upper mold to move to close the mold with the cavity on the lower mold. The pouring temperature is 680 °C, the mold temperature is 200 °C, and the injection speed is 3.4 m / s. The magnesium alloy melt in the vacuum cavity is die-cast into a magnesium alloy backplane casting. The present invention can simultaneously die-cast two magnesium alloy backplane castings, and has the advantage of low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the integrated die-casting mold for magnesium alloy backplane in the initial state of the present invention;

[0016] Figure 2 is a schematic structural diagram of the parts on the fourth support plate and the upper mold;

[0017] Figure 3 is Figure 2 a schematic structural diagram from another angle;

[0018] Figure 4 is a schematic structural diagram of the upper mold, the cooling cavity, and the core mold;

[0019] Figure 5 is Figure 4 a schematic structural diagram from another angle;

[0020] Figure 6 is a schematic structural diagram of the support mechanism and the cooling mechanism;

[0021] Figure 7 is Figure 6 the structural schematic diagram of the middle support mechanism;

[0022] Figure 8 is the structural schematic diagram of the cam, the first contact plate, and the sliding rod;

[0023] Figure 9 is the structural schematic diagram of the parts on the lower die and the fifth support plate;

[0024] Figure 10 is Figure 9 the structural schematic diagram from another angle;

[0025] Figure 11 is the structural schematic diagram of the magnesium alloy backplane casting;

[0026] Figure 12 is Figure 9 the structural schematic diagram with the magnesium alloy backplane casting removed;

[0027] Figure 13 is the structural schematic diagram of the lower die, the cavity, the first through hole, the first feeding port, the second feeding port, and the air channel;

[0028] Figure 14 is the structural schematic diagram of the parts on the fifth support plate;

[0029] Figure 15 is the structural schematic diagram of the vacuum pumping mechanism in the initial state of the upper die and the lower die;

[0030] Figure 16 is the structural schematic diagram of the sliding plate;

[0031] Figure 17 is the structural schematic diagram of the magnesium alloy backplane integrated die-casting mold in the vacuum pumping state;

[0032] Figure 18 is Figure 17 the internal structural schematic diagram of;

[0033] Figure 19 is the structural schematic diagram of the vacuum pumping mechanism in the vacuum pumping state;

[0034] Figure 20 is the structural schematic diagram of the upper die and the lower die in the die-casting state;

[0035] Figure 21 is Figure 20 the internal structural schematic diagram of;

[0036] Figure 22 is the structural schematic diagram of the vacuum pumping mechanism in the die-casting and forming state of the upper die and the lower die.

[0037] Reference numerals: 1, first support frame; 2, melting furnace; 3, hydraulic cylinder; 4, first electric cylinder; 5, support mechanism; 501, housing; 502, first connecting shaft; 503, first support plate; 504, first spring; 505, sliding rod; 506, cam; 507, first connecting rod; 508, motor; 509, connecting plate; 510, first abutting plate; 511, second connecting shaft; 512, first connecting plate; 513, third connecting shaft; 6, cooling mechanism; 601, first fixing plate; 602, cooling pipe; 603, second fixing plate; 604, circulation pipe; 7, vacuum pumping mechanism; 701, vacuum generator; 702, second spring; 703, first sealing column; 704, fixed rod; 705, second electric cylinder; 706, third spring; 707, second sealing column; 708, second support plate; 709, second sliding rod; 710, third sliding rod; 711, fourth spring; 712, second abutting plate; 713, sliding plate; 7131, horizontal plate; 7132, first vertical plate; 7133, first inclined plate; 7134, second vertical plate; 7135, second inclined plate; 7136, third vertical plate; 714, second connecting plate; 715, third connecting plate; 8, third support plate; 9, support column; 10, fourth support plate; 11, second connecting rod; 12, upper mold; 13, fifth spring; 14, lower mold; 15, fixed sleeve; 16, fifth support plate; 17, pipeline; 18, first side plate; 19, cooling cavity; 20, core; 21, second side plate; 22, magnesium alloy backplate casting; 23, third electric cylinder; 24, top template; 25, cavity; 26, top die head; 27, first through hole; 28, first feed port; 29, second feed port; 30, pressing plate; 31, shielding plate; 32, positioning hole; 33, sliding sleeve; 34, positioning rod; 35, second through hole; 36, runner; 37, vacuum cavity; 38, air passage. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The integrated die-casting mold for the magnesium alloy backplane of this embodiment is composed of a first support frame 1, a melting furnace 2, a hydraulic cylinder 3, a first electric cylinder 4, a support mechanism 5, a cooling mechanism 6, a vacuum pumping mechanism 7, a third support plate 8, support columns 9, a fourth support plate 10, a second connecting rod 11, an upper mold 12, a fifth spring 13, a lower mold 14, a fixed sleeve 15, a fifth support plate 16, a pipeline 17, a first side plate 18, a cooling cavity 19, a core 20, a second side plate 21, a magnesium alloy backplane casting 22, a third electric cylinder 23, a top template 24, a cavity 25, a top die head 26, a first through hole 27, a first feed port 28, a second feed port 29, a pressing plate 30, a shielding plate 31, a positioning hole 32, a sliding sleeve 33, a positioning rod 34, a second through hole 35, a runner 36, a vacuum cavity 37, and an air passage 38 connected together.

[0040] As Figures 1 to 5 , Figures 9 to 14 , Figures 17 to 22 shown, a plurality of support columns 9 are arranged on the fifth support plate 16, a third support plate 8 is arranged on the tops of the plurality of support columns 9, a first electric cylinder 4 for driving the fourth support plate 10 to move vertically along the support columns 9 is arranged on the third support plate 8, the bottom of the fourth support plate 10 is fixedly connected to the upper mold 12 through a plurality of second connecting rods 11, the upper mold 12 is located below the fourth support plate 10, cores 20 are respectively arranged on both sides of the bottom of the upper mold 12, shielding plates 31 located above the cores 20 are respectively arranged on both sides above the upper mold 12, a cooling cavity 19 is formed between the shielding plate 31 and the core 20, and a cooling mechanism 6 for communicating with the cooling cavity 19 is arranged at the bottom of the fourth support plate 10.

[0041] First side plates 18 are respectively arranged on both sides of the upper mold 12, a support mechanism 5 for fixing the upper mold 12 and the lower mold 14 is arranged on the first side plates 18, a vacuum cavity 37 is formed between the core 20 at the bottom of the upper mold 12 and the cavity 25 on the lower mold 14, second side plates 21 are respectively arranged on both sides of the lower mold 14, a vacuum pumping mechanism 7 for evacuating the inside of the vacuum cavity 37 is arranged on the second side plates 21, and pressing plates 30 in contact with the vacuum pumping mechanism 7 are respectively arranged on the first side plates 18.

[0042] A plurality of fixed sleeves 15 are arranged on the upper side of the fifth support plate 16. Positioning rods 34 are respectively arranged inside the fixed sleeves 15. A sliding sleeve 33 is slidably connected to each positioning rod 34 in the vertical direction. A plurality of second through holes 35 through which the positioning rods 34 penetrate are machined on the lower die 14. A fifth spring 13 is respectively arranged on each positioning rod 34. One end of each fifth spring 13 is fixedly connected to the top end of the sliding sleeve 33, and the other end of each fifth spring 13 is respectively fixedly connected to the inside of the second through hole 35. A plurality of positioning holes 32 respectively engaged with the positioning rods 34 are machined on the upper die 12, which is convenient for ensuring the precise positioning of the upper die 12 and the lower die 14 during mold closing. The lower die 14 is arranged on the top of the plurality of fixed sleeves 15. The lower die 14 is located above the fifth support plate 16 and below the upper die 12. Cavities 25 located below the core 20 are respectively arranged on both sides of the lower die 14. Two first through holes 27 communicated with the output ends of the pipelines 17 are arranged on the lower die 14. Molten magnesium alloy flows in the pipelines 17. A first support frame 1 is arranged on one side of the fifth support plate 16. A melting furnace 2 is arranged on the first support frame 1. There is molten magnesium alloy in the melting furnace 2. The output end of the melting furnace 2 is communicated with the input end of the pipeline 17. A hydraulic cylinder 3 for pushing the molten magnesium alloy in the melting furnace 2 into the pipeline 17 is arranged on the melting furnace 2. The inner circumferential side walls of each first through hole 27 are respectively machined with first feeding ports 28. A runner 36 communicated with the first feeding ports 28 is machined inside the lower die 14. Second feeding ports 29 communicated with the runner 36 are respectively machined inside each cavity 25. The molten magnesium alloy in the pipelines 17 flows into the cavities 25 through the first feeding ports 28, the runner 36, and the second feeding ports 29 in sequence for die casting to form magnesium alloy backplane castings 22. Third electric cylinders 23 are respectively arranged on both sides of the fifth support plate 16. The output ends of the third electric cylinders 23 are respectively fixedly connected to a top template 24. A plurality of ejector pins 26 for ejecting the magnesium alloy backplane castings 22 formed in the cavities 25 are arranged on the top template 24.

[0043] As Figure 3 , Figures 6 to 8 shown, the support mechanism 5 is composed of a housing 501, a first connecting shaft 502, a first support plate 503, a first spring 504, a sliding rod 505, a cam 506, a first connecting rod 507, an electric motor 508, a connecting disk 509, a first abutting plate 510, a second connecting shaft 511, a first connecting plate 512, and a third connecting shaft 513.

[0044] The support mechanism 5 is as follows: at both ends of the first side plate 18, there are respectively provided with housings 501. On the first side plate 18, there is a motor 508 for driving the connection disk 509 to rotate. The connection disk 509 is eccentrically connected to the first connecting rod 507. Both ends of the first connecting rod 507 are respectively connected to the first connecting shafts 502. At both ends of each first connecting shaft 502, there are respectively fixedly installed second connecting shafts 511. Each second connecting shaft 511 is respectively fixedly connected to the first connecting plate 512. Each first connecting plate 512 is respectively fixedly connected to the third connecting shaft 513. On each third connecting shaft 513, there is respectively fixedly installed a cam 506. Each third connecting shaft 513 is respectively rotatably connected to the inside of the housing 501. At the inner bottom of each housing 501, there is respectively a sliding rod 505 slidably connected in the vertical direction. At the top of each sliding rod 505, there is respectively provided with a first contact plate 510 in contact with the cam 506. At the bottom of each sliding rod 505, there is respectively provided with a first support plate 503 in contact with the horizontal plane of the second side plate 21. The first support plate 503 is located outside the housing 501. On each sliding rod 505, there is respectively provided with a first spring 504. One end of each first spring 504 is respectively fixedly connected to the inner bottom of the housing 501, and the other end of each first spring 504 is respectively in contact connection with the first contact plate 510.

[0045] As Figure 6 shown, the cooling mechanism 6 is composed of a first fixing plate 601, a cooling pipe 602, a second fixing plate 603, a circulation pipe 604, and a chiller.

[0046] The cooling mechanism 6 is as follows: at the bottom of the fourth support plate 10, there are provided with a first fixing plate 601 and a second fixing plate 603. On the first fixing plate 601, there is a cooling pipe 602. The input end of the cooling pipe 602 is communicated with the output end of the chiller, and the output end of the cooling pipe 602 is communicated with the input end of the cooling cavity 19. On the second fixing plate 603, there is a circulation pipe 604. The output end of the cooling cavity 19 is communicated with the input end of the circulation pipe 604, and the output end of the circulation pipe 604 is communicated with the input end of the chiller.

[0047] As Figures 14 to 16 shown, the vacuum pumping mechanism 7 is composed of a vacuum generator 701, a second spring 702, a first sealing column 703, a fixed rod 704, a second electric cylinder 705, a third spring 706, a second sealing column 707, a second support plate 708, a second sliding rod 709, a third sliding rod 710, a fourth spring 711, a second contact plate 712, a sliding plate 713, a second connecting plate 714, and a third connecting plate 715.

[0048] The vacuum pumping mechanism 7 is as follows: An air passage 38 that communicates with a plurality of vacuum cavities 37 is machined inside the lower mold 14. A vacuum generator 701 that communicates with the air passage 38 is provided on the second side plate 21. Second support plates 708 are fixedly installed on both sides of the second side plate 21. A plurality of second sliding rods 709 are slidably connected to each second support plate 708 in the vertical direction. The top end of each second sliding rod 709 abuts against the bottom of the pressing plate 30. The bottom of the plurality of second sliding rods 709 is fixedly connected to a sliding plate 713. A third spring 706 is provided on each second sliding rod 709. One end of each third spring 706 is fixedly connected to the top end of the second sliding rod 709, and the other end of each third spring 706 is fixedly connected to the second support plate 708. A third sliding rod 710 is slidably connected to each second support plate 708 in the horizontal direction. A second abutting plate 712 that abuts against the sliding plate 713 is provided at one end of each third sliding rod 710. The other end of each third sliding rod 710 is fixedly connected to a plurality of second sealing columns 707 through a second connecting plate 714. Each second sealing column 707 is slidably connected to the air passage 38. A fourth spring 711 is provided on each third sliding rod 710. One end of each fourth spring 711 is fixedly connected to the second abutting plate 712, and the other end of each fourth spring 711 is fixedly connected to the second support plate 708.

[0049] A plurality of second electric cylinders 705 are provided on the fifth support plate 16. The output end of each second electric cylinder 705 is fixedly connected to a first sealing column 703 through a third connecting plate 715. The first sealing column 703 is slidably connected to the first through hole 27 in the vertical direction. The first sealing column 703 blocks the communication between the flow channel 36 and the first through hole 27. A plurality of fixing rods 704 are fixedly installed at the bottom of the lower mold 14. The third connecting plate 715 is slidably connected to the plurality of fixing rods 704 in the vertical direction. A second spring 702 is provided on each fixing rod 704. One end of each second spring 702 is fixedly connected to the bottom of the lower mold 14, and the other end of each second spring 702 is fixedly connected to the third connecting plate 715.

[0050] Such as Figure 16As shown, the sliding plate 713 is fixedly connected by a horizontal plate 7131, a first vertical plate 7132, a first inclined plate 7133, a second vertical plate 7134, a second inclined plate 7135, and a third vertical plate 7136. A first vertical plate 7132 is provided on one side of the horizontal plate 7131. The first vertical plate 7132 is successively provided with a first inclined plate 7133, a second vertical plate 7134, a second inclined plate 7135, and a third vertical plate 7136 from bottom to top. The perpendicular bisectors of the first vertical plate 7132, the second vertical plate 7134, and the third vertical plate 7136 are parallel to each other. The perpendicular bisectors of the first vertical plate 7132 and the third vertical plate 7136 are the same vertical line. The second vertical plate 7134 is respectively located on one side of the first vertical plate 7132 and the third vertical plate 7136. The first vertical plate 7132, the second vertical plate 7134, and the third vertical plate 7136 respectively abut against the second abutting plate 712.

[0051] The working principle of this embodiment is as follows: (1) Evacuating the inside of the vacuum cavity 37: The first electric cylinder 4 controls the fourth support plate 10 to move vertically on the support column 9. The fourth support plate 10 drives the upper mold 12 to move vertically through the second connecting rod 11. Each positioning hole 32 on the upper mold 12 is respectively clamped with the positioning rod 34 on the lower mold 14 to ensure the precise positioning of the upper mold 12 and the lower mold 14 during mold closing. A vacuum cavity 37 is respectively reserved between the two cores 20 at the bottom of the upper mold 12 and the cavity 25 on the lower mold 14. The support mechanism 5 is used to support the upper mold 12 and the lower mold 14. The vacuum pumping mechanism 7 evacuates the air inside the vacuum cavity 37. The vacuum degree is 20 KPa. A large amount of gas is discharged before the magnesium alloy melt enters the vacuum cavity 37, so that it is in a certain vacuum state. The amount of gas is reduced, and the phenomenon of air entrainment can be reduced during the filling process, and the generation of internal pores and shrinkage defects in the magnesium alloy backplane casting 22 can be reduced.

[0052] Among them, the working principle of the support mechanism 5 for supporting the upper mold 12 and the lower mold 14 is: The output shaft of the motor 508 drives the connecting disk 509 to rotate. The connecting disk 509 drives the first connecting rod 507 to perform eccentric motion. The first connecting rod 507 drives the first connecting shafts 502 on both sides to move. The two ends of each first connecting shaft 502 respectively drive the cam 506 to rotate inside the housing 501 through the second connecting shaft 511, the first connecting plate 512, and the third connecting shaft 513 in sequence. The housing 501 abuts against the first abutting plate 510 during rotation. The first abutting plate 510 drives the sliding rod 505 to move vertically inside the housing 501 by abutting against the cam 506. The first support plate 503 at the bottom of the sliding rod 505 moves to abut against the horizontal plane of the second side plate 21, which is used to support the upper mold 12 and the lower mold 14.

[0053] Among them, the working principle of the vacuum pumping mechanism 7 for pumping the air inside the vacuum cavity 37 is as follows: In the initial state, the second contact plate 712 at one end of the third sliding rod 710 abuts against the first vertical plate 7132 of the sliding plate 713, the second sealing column 707 blocks the inside of the air passage 38, the air passage 38 is blocked from the vacuum cavity 37, the upper mold 12 moves downward in the vertical direction on the support column 9, and the pressing plates 30 on the first side plates 18 on both sides of the upper mold 12 move to abut against the top ends of the second sliding rods 709. The second sliding rods 709 move downward in the vertical direction on the second support plate 708, the second sliding rods 709 drive the sliding plate 713 to move downward in the vertical direction, and the second vertical plate 7134 of the sliding plate 713 moves to abut against the second contact plate 712 at one end of the third sliding rod 710. The second contact plate 712 drives the third sliding rod 710 to move horizontally on the second support plate 708. The second contact plate 712 drives the second sealing column 707 to slide in the vacuum cavity 37 through the second connecting plate 714. The second sealing column 707 is separated from the inside of the air passage 38, and the air passage 38 communicates with the vacuum cavity 37. At the same time, the second electric cylinder 705 is started, and the output end of the second electric cylinder 705 drives the first sealing column 703 to move upward in the vertical direction inside the first through hole 27, so that the outlet end of the pipeline 17 and the first feed port 28 are blocked, and the first feed port 28, the flow channel 36, and the second feed port 29 are not connected to the vacuum cavity 37. The vacuum cavity 37 and the flow channel 36 are in a closed state. The vacuum generator 701 evacuates the inside of the vacuum cavity 37 through the air passage 38, and the vacuum degree is 20 KPa.

[0054] (2) The magnesium alloy melt is die-cast into a magnesium alloy backplane casting 22: The output end of the first electric cylinder 4 continues to push the upper mold 12 to move in the vertical direction on the support column 9. The second sliding rod 709 drives the sliding plate 713 to move downward in the vertical direction. The third vertical plate 7136 of the sliding plate 713 moves to abut against the second contact plate 712 at one end of the third sliding rod 710. The second contact plate 712 drives the third sliding rod 710 to move horizontally on the second support plate 708. The second contact plate 712 drives the second sealing column 707 to slide in the vacuum cavity 37 through the second connecting plate 714. The second sealing column 707 blocks the inside of the air passage 38, and the air passage 38 is blocked from the vacuum cavity 37.

[0055] The output end of the second electric cylinder 705 drives the first sealing column 703 to move downward in the first through hole 27 in the vertical direction. The outlet end of the pipeline 17, the first feed port 28, the flow channel 36, and the second feed port 29 are communicated with the vacuum cavity 37. The magnesium alloy is put into the melting furnace 2, and the magnesium alloy in the melting furnace 2 is melted into a magnesium alloy melt. The hydraulic rod of the hydraulic cylinder 3 presses the magnesium alloy melt in the melting furnace 2 into the pipeline 17. The magnesium alloy melt in the pipeline 17 sequentially enters the vacuum cavity 37 through the first through hole 27, the first feed port 28, the flow channel 36, and the second feed port 29. The output end of the first electric cylinder 4 continues to push the two core pins 20 at the bottom of the upper mold 12 to move to close the mold with the cavity 25 on the lower mold 14 under high pressure. The pouring temperature is 680 °C, the mold temperature is 200 °C, and the injection speed is 3.4 m / s. The magnesium alloy melt in the vacuum cavity 37 is die-cast into a magnesium alloy backplane casting 22. In this embodiment, two magnesium alloy backplane castings 22 can be die-cast simultaneously.

[0056] (3) Cooling: During the die-casting process, it is necessary to cool it down. The cold water of the chiller enters the cooling cavity 19 through the cooling pipes 602 respectively. The cooling liquid in the cooling cavity 19 cools it, and the cooled water flows into the chiller through the circulation pipe 604 for circulation.

[0057] (4) Demolding: After cooling, the output end of the first electric cylinder 4 drives the upper mold 12 and the lower mold 14 to open the mold. The output end of the third electric cylinder 23 drives the top template 24 to move upward in the vertical direction. The multiple ejector pins 26 on the top template 24 eject the magnesium alloy backplane casting 22 in the cavity 25, facilitating the demolding of the magnesium alloy backplane casting 22.

[0058] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An integrated die-casting mold for a magnesium alloy backplane, characterized in that: It includes a fifth support plate (16), on which a plurality of support columns (9) are arranged. At the tops of the plurality of support columns (9), a third support plate (8) is provided. On the third support plate (8), a first electric cylinder (4) is provided to drive a fourth support plate (10) to move vertically along the support columns (9). The bottom of the fourth support plate (10) is fixedly connected to an upper mold (12) through a plurality of second connecting rods (11). The upper mold (12) is located below the fourth support plate (10). On both sides of the bottom of the upper mold (12), core molds (20) are respectively provided. On both sides above the upper mold (12), baffle plates (31) located above the core molds (20) are respectively provided. A cooling cavity (19) is formed between the baffle plates (31) and the core molds (20). At the bottom of the fourth support plate (10), a cooling mechanism (6) for communicating with the cooling cavity (19) is provided; On the upper side of the fifth support plate (16), a plurality of fixed sleeves (15) are provided. At the tops of the plurality of fixed sleeves (15), a lower mold (14) is provided. The lower mold (14) is located above the fifth support plate (16). The lower mold (14) is located below the upper mold (12). On both sides of the lower mold (14), cavities (25) located below the core molds (20) are respectively provided. On the lower mold (14), two first through holes (27) communicating with the output ends of the pipelines (17) are provided. Molten magnesium alloy flows in the pipelines (17). On the circumferential side walls of each first through hole (27), first feeding ports (28) are respectively machined. Inside the lower mold (14), a runner (36) communicating with the first feeding ports (28) is machined. In each cavity (25), a second feeding port (29) communicating with the runner (36) is respectively machined. The molten magnesium alloy in the pipelines (17) flows into the cavities (25) through the first feeding ports (28), the runners (36), and the second feeding ports (29) in sequence to be die-cast into magnesium alloy backplane castings (22); The cooling mechanism (6) is as follows: At the bottom of the fourth support plate (10), a first fixing plate (601) and a second fixing plate (603) are provided. On the first fixing plate (601), a cooling pipe (602) is provided. The input end of the cooling pipe (602) is communicated with the output end of a chiller. The output end of the cooling pipe (602) is communicated with the input end of the cooling cavity (19). On the second fixing plate (603), a circulating pipe (604) is provided. The output end of the cooling cavity (19) is communicated with the input end of the circulating pipe (604). The output end of the circulating pipe (604) is communicated with the input end of the chiller; On both sides of the said upper die (12), there are respectively first side plates (18). A support mechanism (5) for fixing the upper die (12) and the lower die (14) is arranged on the first side plates (18). A vacuum cavity (37) is formed between the core (20) at the bottom of the upper die (12) and the cavity (25) on the lower die (14). On both sides of the lower die (14), there are respectively second side plates (21). A vacuum pumping mechanism (7) for pumping vacuum inside the vacuum cavity (37) is arranged on the second side plates (21). Pressure plates (30) that are in contact with the vacuum pumping mechanism (7) are respectively arranged on the first side plates (18). The said vacuum pumping mechanism (7) is as follows: An air passage (38) that communicates with a plurality of vacuum cavities (37) is machined inside the lower die (14). A vacuum generator (701) that communicates with the air passage (38) is arranged on the second side plate (21). Second support plates (708) are fixedly installed on both sides of the second side plate (21). A plurality of second sliding rods (709) are slidably connected to each second support plate (708) in the vertical direction. The top ends of each of the second sliding rods (709) are respectively in contact with the bottom of the pressure plate (30). The bottoms of the plurality of second sliding rods (709) are fixedly connected to a sliding plate (713). A third spring (706) is respectively arranged on each of the second sliding rods (709). One end of each third spring (706) is fixedly connected to the top end of the second sliding rod (709), and the other end of each third spring (706) is fixedly connected to the second support plate (708). A third sliding rod (710) is slidably connected to each second support plate (708) in the horizontal direction. A second contact plate (712) that is in contact with the sliding plate (713) is respectively arranged at one end of each third sliding rod (710). The other end of each third sliding rod (710) is fixedly connected to a plurality of second sealing columns (707) through a second connecting plate (714). Each of the second sealing columns (707) is slidably connected to the air passage (38). A fourth spring (711) is respectively arranged on each of the third sliding rods (710). One end of each fourth spring (711) is fixedly connected to the second contact plate (712), and the other end of each fourth spring (711) is fixedly connected to the second support plate (708). A plurality of second electric cylinders (705) are arranged on the fifth support plate (16). The output end of each second electric cylinder (705) is fixedly connected to a first sealing column (703) through a third connecting plate (715). The first sealing column (703) is slidably connected to the first through hole (27) in the vertical direction. The first sealing column (703) blocks the communication between the flow channel (36) and the first through hole (27). A plurality of fixing rods (704) are fixedly installed at the bottom of the lower mold (14). The third connecting plate (715) is slidably connected to the plurality of fixing rods (704) in the vertical direction. A second spring (702) is arranged on each fixing rod (704). One end of each second spring (702) is fixedly connected to the bottom of the lower mold (14), and the other end of each second spring (702) is fixedly connected to the third connecting plate (715); The sliding plate (713) is fixedly connected by a horizontal plate (7131), a first vertical plate (7132), a first inclined plate (7133), a second vertical plate (7134), a second inclined plate (7135) and a third vertical plate (7136). A first vertical plate (7132) is arranged on one side of the horizontal plate (7131). The first vertical plate (7132) is sequentially provided with a first inclined plate (7133), a second vertical plate (7134), a second inclined plate (7135) and a third vertical plate (7136) from bottom to top. The vertical bisectors of the first vertical plate (7132), the second vertical plate (7134) and the third vertical plate (7136) are parallel to each other. The vertical bisectors of the first vertical plate (7132) and the third vertical plate (7136) are the same vertical line. The second vertical plate (7134) is respectively located on one side of the first vertical plate (7132) and the third vertical plate (7136). The first vertical plate (7132), the second vertical plate (7134) and the third vertical plate (7136) respectively abut against the second abutting plate (712).

2. The integrated die-casting mold for magnesium alloy backplane according to claim 1, wherein: A positioning rod (34) is respectively arranged inside each fixing sleeve (15). A sliding sleeve (33) is slidably connected to each positioning rod (34) in the vertical direction. A plurality of second through holes (35) penetrated by the positioning rods (34) are machined on the lower mold (14). A fifth spring (13) is respectively arranged on each positioning rod (34). One end of each fifth spring (13) is fixedly connected to the top end of the sliding sleeve (33), and the other end of each fifth spring (13) is respectively fixedly connected to the inside of the second through hole (35). A plurality of positioning holes (32) respectively clamped with the positioning rods (34) are machined on the upper mold (12).

3. The one-piece die-casting mold for magnesium alloy backplane according to claim 1, wherein The described supporting mechanism (5) is as follows: Shells (501) are respectively arranged at both ends of the first side plate (18). A motor (508) for driving the connection disk (509) to rotate is arranged on the first side plate (18). The connection disk (509) is eccentrically connected to the first connecting rod (507). Both ends of the first connecting rod (507) are respectively connected to the first connecting shaft (502). Second connecting shafts (511) are respectively and fixedly installed at both ends of each first connecting shaft (502). Each second connecting shaft (511) is fixedly connected to the first connecting plate (512). Each first connecting plate (512) is fixedly connected to the third connecting shaft (513). Cams (506) are respectively and fixedly installed on each third connecting shaft (513). Each third connecting shaft (513) is respectively and rotatably connected to the inside of the shell (501). Slide rods (505) are respectively and slidably connected to the inner bottom of each shell (501) in the vertical direction. First contact plates (510) that are in contact with the cams (506) are respectively arranged at the tops of each slide rod (505). First support plates (503) that are in contact with the horizontal plane of the second side plate (21) are respectively arranged at the bottoms of each slide rod (505). The first support plates (503) are located outside the shells (501). First springs (504) are respectively arranged on each slide rod (505). One end of each first spring (504) is respectively fixedly connected to the inner bottom of the shell (501), and the other end of each first spring (504) is respectively in contact connection with the first contact plate (510).

4. The integrated die-casting mold for magnesium alloy backplane according to claim 1, wherein: Third electric cylinders (23) are respectively arranged on both sides of the described fifth support plate (16). The output ends of the third electric cylinders (23) are respectively fixedly connected to the top template (24). A plurality of top die heads (26) for ejecting the formed magnesium alloy backplane castings (22) in the cavity (25) are arranged on the top template (24).

5. The integrated die-casting mold for magnesium alloy backplane according to claim 1, characterized in that: A first support frame (1) is arranged on one side of the described fifth support plate (16). A melting furnace (2) is arranged on the first support frame (1). There is magnesium alloy molten liquid in the melting furnace (2). The output end of the melting furnace (2) is communicated with the input end of the pipeline (17). A hydraulic cylinder (3) for pushing the magnesium alloy molten liquid in the melting furnace (2) into the pipeline (17) is arranged on the melting furnace (2).

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