Integrated die-casting die for magnesium alloy back plate

Abstract

The invention discloses a magnesium alloy back plate integrated die-casting die and belongs to the technical field of metal casting equipment. The bottom of a fourth supporting plate is fixedly connected with an upper die through a plurality of second connecting rods, mold cores are arranged on the two sides of the bottom of the upper die respectively, a cooling mechanism is arranged at the bottom of the fourth supporting plate, and a lower die is arranged at the tops of a plurality of fixing sleeves; cavities are respectively formed in two sides of the lower mold. The vacuum cavities are reserved between the two mold cores at the bottom of the upper mold and the mold cavity in the lower mold, the supporting mechanism supports the upper mold and the lower mold, the vacuumizing mechanism vacuumizes air in the vacuum cavities, magnesium alloy molten liquid is cast and flows into the mold cavity to form a magnesium alloy back plate casting, and the mold cores are circularly cooled. After cooling, the magnesium alloy back plate casting in the cavity is ejected out by the multiple ejection mold heads on the ejection mold plate, demolding of the magnesium alloy back plate casting is facilitated, the defects of the die casting can be reduced, the forming quality of the die casting and the overall density of the die casting are improved, and the die casting mold has the advantage of being high in yield of the die casting.

Description

Technical Field

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

[0002] Magnesium alloy is the lightest material among metal engineering structural materials. It has the advantages of low density, high specific stiffness, high specific strength, excellent shock absorption, stability, electromagnetic shielding, and green environmental protection. Magnesium alloy is widely used in lightweighting in machinery, automobile, aerospace and other industries. For example, a large-size display screen of a car requires a large-size, high-strength, and high-rigidity backplane to ensure the normal operation of the display screen when the vehicle is driving on various road conditions. At present, the material of the large-size screen on the car is aluminum alloy, but the aluminum alloy material is heavy, so a magnesium alloy die-casting backplane is needed to avoid the problems of poor strength and rigidity, easy deformation, and poor heat dissipation of the plastic backplane.

[0003] There are many factors that affect the magnesium alloy back plate during the die-casting process. Due to the extremely fast filling speed of the molten metal, the gas in the mold cavity often has no time to be discharged. In addition, during the filling process of the molten metal, turbulence is very likely to occur due to the high-speed movement, which can easily draw in and wrap the residual gas. When it solidifies under rapid cooling, it has no time to shrink and form pores or shrinkage holes, which reduces the density of the die-casting. Ordinary die-castings generally cannot undergo subsequent heat treatment. Otherwise, the internal pores will expand during the heating process, reducing the density of the casting, making the pores on the surface of the casting larger, affecting the product precision and surface quality. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a magnesium alloy back plate integrated die-casting mold which improves the forming quality of the die-casting and the overall density of the die-casting.

[0005] The technical solution adopted to solve the above technical problems is: a plurality of support columns are arranged on the fifth support plate, a third support plate is arranged on the top of the plurality of support columns, a first electric cylinder is arranged on the third support plate to drive the fourth support plate to move along the vertical direction on the support column, 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, cores are arranged on both sides of the bottom of the upper mold, shielding plates located above the cores are arranged on both sides above the upper mold, a cooling cavity is formed between the shielding plates and the cores, and a cooling mechanism for interconnecting with the cooling cavity is arranged at the bottom of the fourth support plate; a plurality of fixed A sleeve, a lower mold is arranged on the top of multiple 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 are respectively arranged on both sides of the lower mold, two first through holes connected with the output ends of the pipeline are arranged on the lower mold, magnesium alloy molten liquid flows in the pipeline, a first feed port is processed on the inner circumferential side wall of each first through hole, a flow channel connected with the first feed port is processed inside the lower mold, a second feed port connected with the flow channel is processed inside each cavity, the magnesium alloy molten liquid in the pipeline flows into the cavity through the first feed port, the flow channel and the second feed port in sequence to be die-cast into a magnesium alloy back plate casting.

[0006] Furthermore, each of the fixed sleeves is respectively provided with a positioning rod, each positioning rod is slidably connected to a sliding sleeve in a vertical direction, a plurality of second through holes penetrating the positioning rods are processed on the lower mold, each positioning rod is respectively provided with a fifth spring, one end of each fifth spring is fixedly connected to the top of the sliding sleeve, and the other end of each fifth spring is respectively fixedly connected to the inside of the second through hole, and a plurality of positioning holes are processed on the upper mold and respectively engaged with the positioning rods.

[0007] Furthermore, the cooling mechanism is as follows: a first fixed plate and a second fixed plate are provided at the bottom of the fourth support plate, a cooling pipe is provided on the first fixed plate, the input end of the cooling pipe is connected to the output end of the chiller, the output end of the cooling pipe is connected to the input end of the cooling cavity, a circulating pipe is provided on the second fixed plate, the output end of the cooling cavity is connected to the input end of the circulating pipe, and the output end of the circulating pipe is connected to the input end of the chiller.

[0008] Furthermore, first side panels are respectively provided on both sides of the upper mold, and supporting mechanisms for fixing the upper mold and the lower mold are provided on the first side panels. A vacuum cavity is formed between the core at the bottom of the upper mold and the cavity on the lower mold. Second side panels are respectively provided on both sides of the lower mold, and vacuum extraction mechanisms for vacuuming the inside of the vacuum cavity are provided on the second side panels. Pressure plates that interfere with the vacuum extraction mechanisms are respectively provided on the first side panels.

[0009] Furthermore, the supporting mechanism is as follows: a shell is respectively provided at two ends of the first side plate, a motor is provided on the first side plate to drive the connecting plate to rotate, the connecting plate is eccentrically connected to the first connecting rod, two ends of the first connecting rod are respectively connected to the first connecting shaft, each two ends of the first connecting shaft are respectively fixedly installed with a second connecting shaft, each second connecting shaft is respectively fixedly connected to the first connecting plate, each first connecting plate is respectively fixedly connected to the third connecting shaft, a cam is respectively fixedly installed on each third connecting shaft, each third connecting shaft is respectively rotatably connected with the inside of the shell, each bottom of the shell is respectively slidably connected with a sliding rod in a vertical direction, each sliding rod top is respectively provided with a first contact plate that contacts with the cam, each sliding rod bottom is respectively provided with a first supporting plate that contacts with the horizontal plane of the second side plate, the first supporting plate is located outside the shell, each sliding rod is respectively provided with a first spring, one end of each first spring is respectively fixedly connected to the bottom of the shell, and the other end of each first spring is respectively contacted and connected with the first contact plate.

[0010] Furthermore, the vacuum mechanism is as follows: an air channel connected to a plurality of vacuum cavities is processed inside the lower mold, a vacuum generator connected to the air channel is arranged on the second side plate, and second support plates are fixedly installed on both sides of the second side plate, and each second support plate is slidably connected to a plurality of second sliding rods in a vertical direction, and the top of each second sliding rod is respectively in contact with the bottom of the pressure plate, and the bottoms of the plurality of second sliding rods are fixedly connected to the sliding plate, and a third spring is respectively arranged on each second sliding rod, and one end of each third spring is respectively fixedly connected to the top of the second sliding rod, and the other end of each third spring is respectively fixedly connected to the second support plate, and each second support plate is slidably connected to a third sliding rod in a horizontal direction, and one end of each third sliding rod is respectively provided with a second contact plate in contact with the sliding plate, and the other end of each third sliding rod is connected to the second connecting plate. It is fixedly connected to multiple second sealing columns, each second sealing column is slidably connected to the air channel, each third sliding rod is respectively provided with a fourth spring, one end of each fourth spring is respectively fixedly connected to the second contact plate, and the other end of each fourth spring is respectively fixedly connected to the second support plate; multiple 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 a vertical direction, the first sealing column blocks the flow channel from being connected to the first through hole, multiple fixing rods are fixedly installed on the bottom of the lower mold, the third connecting plate is slidably connected to the multiple fixing rods in a vertical direction, each fixing rod is respectively provided with a second spring, 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] Furthermore, 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, and the first vertical plate is sequentially arranged with a first inclined plate, a second vertical plate, a second inclined plate and a third vertical plate from bottom to top, a bisector of the first vertical plate, a bisector of the second vertical plate and a bisector of the third vertical plate are parallel to each other, a bisector of the first vertical plate and a bisector of 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, and the first vertical plate, the second vertical plate and the third vertical plate respectively contact with the second contact plate.

[0012] Furthermore, third electric cylinders are respectively arranged on both sides of the fifth support plate, and output ends of the third electric cylinders are respectively fixedly connected to the top templates, and the top templates are provided with a plurality of top die heads for ejecting the magnesium alloy back plate casting formed in the cavity.

[0013] Furthermore, a first support frame is provided on one side of the fifth support plate, a melting furnace is provided on the first support frame, there is molten magnesium alloy in the melting furnace, the output end of the melting furnace is connected to the input end of the pipeline, and a hydraulic cylinder is provided on the melting furnace to push the molten magnesium alloy in the melting furnace to the pipeline.

[0014] The beneficial effects of the present invention are as follows: (1) The present invention reserves vacuum cavities between the two cores at the bottom of the upper mold and the cavity on the lower mold, the support mechanism supports the upper mold and the lower mold, and the vacuum mechanism vacuumizes the air inside the vacuum cavity. The magnesium alloy molten metal is liquid-casted into the cavity to form a magnesium alloy back plate casting. During the die-casting process, the cold water of the chiller circulates and cools the core. After cooling, the multiple top die heads on the top mold plate eject the magnesium alloy back plate casting in the cavity, which is convenient for demolding the magnesium alloy back plate casting, can reduce the defects of the die-casting, improve the forming quality of the die-casting and the overall density of the die-casting, and the present invention has the advantage of a high yield of die-castings; (2) The present invention adopts an air channel that is interconnected with the vacuum cavity, the first feed port, the flow channel, and the second feed port are not connected to the vacuum cavity, the vacuum cavity and the flow channel are in a closed state, and the vacuum generator passes the air channel to the vacuum cavity. The vacuum chamber is evacuated, and a large amount of gas is discharged before the magnesium alloy melt enters the vacuum chamber, so that it is in a certain vacuum state, the amount of gas is reduced, and the air entrainment phenomenon can be reduced during the filling process, thereby reducing the generation of internal pores and shrinkage defects of the magnesium alloy back plate casting, improving the overall density and casting quality of the magnesium alloy back plate casting, and reducing the casting scrap rate; (3) The present invention adopts the magnesium alloy melt in the pipeline to enter the vacuum chamber through the first through hole, the first feed port, the runner, and the second feed port in sequence, and the output end of the first electric cylinder continues to push the two cores at the bottom of the upper mold to move to the mold cavity on the lower mold with high pressure. The pouring temperature is 680°C, the mold temperature is 200°C, and the injection speed is 3.4m / s. The magnesium alloy melt in the vacuum chamber is die-cast to form a magnesium alloy back plate casting. The present invention can simultaneously die-cast two magnesium alloy back plate castings, and the present invention has the advantage of low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the magnesium alloy back plate integrated die-casting mold of the present invention in the initial state; Figure 2 Is a schematic diagram of the structure of the fourth support plate and the parts on the upper mold; Figure 3 yes Figure 2 A schematic diagram of the structure from another angle; Figure 4 It is a schematic diagram of the structure of the upper mold, cooling cavity and core; Figure 5 yes Figure 4 A schematic diagram of the structure from another angle; Figure 6 It is a structural schematic diagram of the supporting mechanism and the cooling mechanism; Figure 7 yes Figure 6 Schematic diagram of the structure of the middle support mechanism; Figure 8It is a schematic diagram of the structure of the cam, the first contact plate, and the sliding rod; Fig. 9 It is a schematic diagram of the structure of the parts on the lower mold and the fifth support plate; Fig.10 yes Fig. 9 A schematic diagram of the structure from another angle; Fig.11 It is a schematic diagram of the structure of a magnesium alloy back plate casting; Fig.12 yes Fig. 9 A schematic diagram of the structure without the magnesium alloy back plate casting; Fig.13 It is a structural schematic diagram of the lower mold, the cavity, the first through hole, the first feed port, the second feed port and the air channel; Fig.14 Is a schematic diagram of the structure of the parts on the fifth support plate; Fig.15 It is a schematic diagram of the structure of the vacuum extraction mechanism of the upper mold and the lower mold in the initial state; Fig.16 It is a schematic diagram of the structure of the sliding plate; Fig.17 It is a schematic diagram of the structure of the integrated die-casting mold of the magnesium alloy back plate under vacuum state; Fig.18 yes Fig.17 Schematic diagram of the internal structure; Fig.19 It is a structural diagram of the vacuum pumping mechanism under the vacuum pumping state; Fig. 20 It is a schematic diagram of the structure of the upper mold and the lower mold in the die-casting state; Fig.21 yes Fig. 20 Schematic diagram of the internal structure; Fig. 22 It is a structural schematic diagram of the vacuum extraction mechanism of the upper mold and the lower mold in the die-casting molding state.

[0016] Figure 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 supporting plate; 504, first spring; 505, sliding rod; 506, cam; 507, first connecting rod; 508, motor; 509, connecting plate; 510, first contact plate; 511, second connecting shaft; 512, first connecting plate; 513, third connecting shaft; 6, cooling mechanism ; 601, first fixed plate; 602, cooling pipe; 603, second fixed plate; 604, circulation pipe; 7, vacuum 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 slide bar; 710, third slide bar; 711, fourth spring; 712, second contact 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 supporting plate; 9, supporting column; 10, fourth supporting plate; 11, second connecting rod; 12, upper mold; 13, fifth spring; 14, lower mold; 15, fixed sleeve; 16, fifth supporting plate; 17 , pipeline; 18, first side plate; 19, cooling cavity; 20, core; 21, second side plate; 22, magnesium alloy back plate 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, pressure plate; 31, baffle plate; 32, positioning hole; 33, sliding sleeve; 34, positioning rod; 35, second through hole; 36, flow channel; 37, vacuum cavity; 38, air channel. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0018] The magnesium alloy back plate integrated die-casting mold 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 mechanism 7, a third support plate 8, a support column 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 back plate 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 baffle plate 31, a positioning hole 32, a sliding sleeve 33, a positioning rod 34, a second through hole 35, a flow channel 36, a vacuum cavity 37, and an air channel 38.

[0019] like Figures 1 to 5 , Figures 9 to 14 , Figures 17 to 22 As shown, a plurality of support columns 9 are arranged on the fifth support plate 16, a third support plate 8 is arranged on the top of the plurality of support columns 9, a first electric cylinder 4 is arranged on the third support plate 8 for driving the fourth support plate 10 to move along the vertical direction on the support columns 9, 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, a core 20 is arranged on both sides of the bottom of the upper mold 12, baffle plates 31 located above the core 20 are arranged on both sides above the upper mold 12, a cooling cavity 19 is formed between the baffle plate 31 and the core 20, and a cooling mechanism 6 for interconnecting with the cooling cavity 19 is arranged at the bottom of the fourth support plate 10.

[0020] First side plates 18 are respectively provided on both sides of the upper mold 12, and a supporting mechanism 5 for fixing the upper mold 12 and the lower mold 14 is provided on the first side plate 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 provided on both sides of the lower mold 14, and a vacuum pumping mechanism 7 for vacuuming the inside of the vacuum cavity 37 is provided on the second side plate 21. A pressing plate 30 that contacts the vacuum pumping mechanism 7 is respectively provided on the first side plate 18.

[0021] A plurality of fixed sleeves 15 are arranged on the upper side of the fifth support plate 16, and positioning rods 34 are arranged inside the fixed sleeves 15 respectively, and each positioning rod 34 is slidably connected with a sliding sleeve 33 in a vertical direction, and a plurality of second through holes 35 penetrating the positioning rods 34 are processed on the lower mold 14, and a fifth spring 13 is arranged on each positioning rod 34 respectively, and 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 fixedly connected to the inside of the second through hole 35 respectively, and a plurality of positioning holes 32 respectively engaged with the positioning rods 34 are processed on the upper mold 12, so as to ensure the accurate positioning of the upper mold 12 and the lower mold 14 when the mold is closed. A lower mold 14 is arranged on the top of the multiple fixed sleeves 15. The lower mold 14 is located above the fifth support plate 16. The lower mold 14 is located below the upper mold 12. Cavities 25 located below the core 20 are respectively arranged on both sides of the lower mold 14. Two first through holes 27 connected to the output ends of the pipeline 17 are arranged on the lower mold 14. Magnesium alloy melt flows in the pipeline 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. The melting furnace 2 contains magnesium alloy melt. The output end of the melting furnace 2 is connected to the input end of the pipeline 17. The melting furnace 2 is provided with a hydraulic cylinder 3 for pushing the magnesium alloy melt in the melting furnace 2 to the pipeline 17. The inner circumferential side wall of each first through hole 27 is processed with a first feed port 28, the lower mold 14 is processed with a flow channel 36 interconnected with the first feed port 28, and each cavity 25 is processed with a second feed port 29 interconnected with the flow channel 36. The magnesium alloy melt in the pipeline 17 flows into the cavity 25 through the first feed port 28, the flow channel 36, and the second feed port 29 in sequence to be die-casted into a magnesium alloy back plate casting 22. The third electric cylinder 23 is respectively arranged on both sides of the fifth support plate 16, and the output end of the third electric cylinder 23 is respectively fixedly connected to the top mold plate 24, and the top mold plate 24 is provided with a plurality of top die heads 26 for ejecting the magnesium alloy back plate casting 22 formed in the cavity 25.

[0022] like Figure 3 , Figures 6 to 8 As shown, the support mechanism 5 is composed of a shell 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, a motor 508, a connecting disk 509, a first contact plate 510, a second connecting shaft 511, a first connecting plate 512, and a third connecting shaft 513.

[0023] The supporting mechanism 5 comprises: a housing 501 is respectively provided at both ends of the first side plate 18, a motor 508 for driving a connecting plate 509 to rotate is provided on the first side plate 18, the connecting plate 509 is eccentrically connected to a first connecting rod 507, both ends of the first connecting rod 507 are respectively connected to a first connecting shaft 502, a second connecting shaft 511 is respectively fixedly installed at both ends of each first connecting shaft 502, each second connecting shaft 511 is respectively fixedly connected to a first connecting plate 512, each first connecting plate 512 is respectively fixedly connected to a third connecting shaft 513, each third connecting shaft 513 is respectively fixedly installed with a cam 506, and each third connecting shaft 51 3 are rotatably connected to the inside of the shell 501, each of the bottom of the shell 501 is slidably connected with a sliding rod 505 in a vertical direction, the top of each sliding rod 505 is provided with a first abutting plate 510 abutting against the cam 506, the bottom of each sliding rod 505 is provided with a first supporting plate 503 abutting against the horizontal surface of the second side plate 21, the first supporting plate 503 is located outside the shell 501, each sliding rod 505 is provided with a first spring 504, one end of each first spring 504 is fixedly connected to the bottom of the shell 501, and the other end of each first spring 504 is in contact with the first abutting plate 510.

[0024] like Figure 6 As 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.

[0025] The cooling mechanism 6 is as follows: a first fixed plate 601 and a second fixed plate 603 are provided at the bottom of the fourth support plate 10, a cooling pipe 602 is provided on the first fixed plate 601, the input end of the cooling pipe 602 is interconnected with the output end of the chiller, the output end of the cooling pipe 602 is interconnected with the input end of the cooling cavity 19, a circulation pipe 604 is provided on the second fixed plate 603, the output end of the cooling cavity 19 is interconnected with the input end of the circulation pipe 604, and the output end of the circulation pipe 604 is interconnected with the input end of the chiller.

[0026] like Figures 14 to 16 As shown, the vacuum mechanism 7 is composed of a vacuum generator 701, a second spring 702, a first sealing column 703, a fixing rod 704, a second electric cylinder 705, a third spring 706, a second sealing column 707, a second support plate 708, a second slide bar 709, a third slide bar 710, a fourth spring 711, a second resistance plate 712, a sliding plate 713, a second connecting plate 714, and a third connecting plate 715.

[0027] The vacuum pumping mechanism 7 is as follows: an air passage 38 interconnected with a plurality of vacuum chambers 37 is processed inside the lower mold 14; a vacuum generator 701 interconnected 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 slide bars 709 are slidably connected to each second support plate 708 in a vertical direction; the top of each second slide bar 709 is respectively in contact with the bottom of the pressing plate 30; the bottoms of the plurality of second slide bars 709 are fixedly connected to the sliding plate 713; a third spring 706 is respectively arranged on each second slide bar 709; one end of each third spring 706 is respectively fixedly connected to the top of the second slide bar 709; and each third spring The other end of 706 is fixedly connected to the second support plate 708, each second support plate 708 is slidably connected with a third slide bar 710 in the horizontal direction, and one end of each third slide bar 710 is respectively provided with a second contact plate 712 that contacts the sliding plate 713, and the other end of each third slide bar 710 is fixedly connected to multiple second sealing columns 707 through a second connecting plate 714, and each second sealing column 707 is respectively slidably connected to the air channel 38, and each third slide bar 710 is respectively provided with a fourth spring 711, and one end of each fourth spring 711 is respectively fixedly connected to the second contact plate 712, and the other end of each fourth spring 711 is respectively fixedly connected to the second support plate 708.

[0028] A plurality of second electric cylinders 705 are arranged on the fifth support plate 16, and the output end of each second electric cylinder 705 is fixedly connected to the first sealing column 703 through the third connecting plate 715, and the first sealing column 703 is slidably connected to the first through hole 27 in the vertical direction, and the first sealing column 703 blocks the flow channel 36 from being connected to the first through hole 27, and a plurality of fixing rods 704 are fixedly installed on the bottom of the lower mold 14, and the third connecting plate 715 is slidably connected to the plurality of fixing rods 704 in the vertical direction, and a second spring 702 is respectively arranged on each fixing rod 704, and 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.

[0029] like Fig.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. The first vertical plate 7132 is arranged on one side of the horizontal plate 7131. The first vertical plate 7132 is arranged with the first inclined plate 7133, the second vertical plate 7134, the second inclined plate 7135 and the third vertical plate 7136 in sequence from bottom to top. The median perpendicular line of the straight plate 7132, the median perpendicular line of the second vertical plate 7134 and the median perpendicular line of the third vertical plate 7136 are parallel to each other, the median perpendicular line of the first vertical plate 7132 and the median perpendicular line of the third vertical plate 7136 are the same vertical line, the second vertical plate 7134 is located on one side of the first vertical plate 7132 and the third vertical plate 7136 respectively, and the first vertical plate 7132, the second vertical plate 7134 and the third vertical plate 7136 respectively contact the second contact plate 712.

[0030] The working principle of this embodiment is as follows: (1) evacuating the inside of the vacuum chamber 37: the first electric cylinder 4 controls the fourth support plate 10 to move in the vertical direction on the support column 9, and the fourth support plate 10 drives the upper mold 12 to move in the vertical direction through the second connecting rod 11. Each positioning hole 32 on the upper mold 12 is respectively engaged with the positioning rod 34 on the lower mold 14 to ensure the accurate positioning of the upper mold 12 and the lower mold 14. A vacuum chamber 37 is 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 mechanism 7 evacuates the air inside the vacuum chamber 37, and the vacuum degree is 20 KPa. A large amount of gas is discharged before the magnesium alloy melt enters the vacuum chamber 37, so that it is in a certain vacuum state. The amount of gas is reduced, and the air entrainment phenomenon can be reduced during the filling process, thereby reducing the generation of internal pores and shrinkage defects of the magnesium alloy back plate casting 22.

[0031] Among them, the working principle of the support mechanism 5 supporting the upper mold 12 and the lower mold 14 is: the output shaft of the motor 508 drives the connecting plate 509 to rotate, the connecting plate 509 drives the first connecting rod 507 to move eccentrically, and the first connecting rod 507 drives the first connecting shafts 502 on both sides to move, and each of the two ends of the first connecting shaft 502 drives the cam 506 to rotate inside the shell 501 through the second connecting shaft 511, the first connecting plate 512, and the third connecting shaft 513 in sequence. The shell 501 contacts the first contact plate 510 during the rotation process. The first contact plate 510 drives the sliding rod 505 to move in the vertical direction inside the shell 501 by contacting the cam 506. The first support plate 503 at the bottom of the sliding rod 505 moves to contact the horizontal plane of the second side plate 21, which is used to support the upper mold 12 and the lower mold 14.

[0032] The working principle of the vacuum mechanism 7 for evacuating the air inside the vacuum chamber 37 is as follows: in the initial state, the second contact plate 712 at one end of the third sliding bar 710 contacts the first vertical plate 7132 of the sliding plate 713, the second sealing column 707 is blocked in the air channel 38, the air channel 38 is blocked from the vacuum chamber 37, the upper mold 12 moves downward along the vertical direction on the support column 9, the pressing plates 30 on the first side plates 18 on both sides of the upper mold 12 move to contact the top of the second sliding bar 709, the second sliding bar 709 moves downward along the vertical direction on the second support plate 708, the second sliding bar 709 drives the sliding plate 713 to move downward along the vertical direction, the second vertical plate 7134 of the sliding plate 713 moves to contact the second contact plate 712 at one end of the third sliding bar 710, and the second contact plate 713 is moved to contact the second contact plate 712 at one end of the third sliding bar 710. 12 drives the third sliding rod 710 to move horizontally on the second supporting plate 708, the second contact plate 712 drives the second sealing column 707 to slide in the vacuum chamber 37 through the second connecting plate 714, the second sealing column 707 is separated from the inside of the air channel 38, and the air channel 38 and the vacuum chamber 37 are connected to each other. 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 is blocked with the first feed port 28, the first feed port 28, the flow channel 36, and the second feed port 29 are not connected with the vacuum chamber 37, the vacuum chamber 37 and the flow channel 36 are in a closed state, and the vacuum generator 701 evacuates the inside of the vacuum chamber 37 through the air channel 38, and the vacuum degree is 20KPa.

[0033] (2) The magnesium alloy is molten and liquid-casted to form a magnesium alloy back plate 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 slide bar 709 drives the slide plate 713 to move downward in the vertical direction, the third vertical plate 7136 of the slide plate 713 moves to contact with the second contact plate 712 at one end of the third slide bar 710, the second contact plate 712 drives the third slide bar 710 to move in the horizontal direction on the second support plate 708, the second contact plate 712 drives the second sealing column 707 to slide in the vacuum chamber 37 through the second connecting plate 714, the second sealing column 707 blocks the inside of the air channel 38, and the air channel 38 is blocked from the vacuum chamber 37.

[0034] The output end of the second electric cylinder 705 drives the first sealing column 703 to move downward in the vertical direction inside the first through hole 27. The outlet end of the pipeline 17, the first feed port 28, the flow channel 36, and the second feed port 29 are connected to the vacuum chamber 37. The magnesium alloy is put into the melting furnace 2. The magnesium alloy in the melting furnace 2 is melted into 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 passes through the first through hole 27, the first feed port 28, the flow channel 36, and the second feed port 29 in sequence. The opening 28, the runner 36 and the second feed opening 29 enter into the vacuum cavity 37, and the output end of the first electric cylinder 4 continues to push the two cores 20 at the bottom of the upper mold 12 to move to the mold cavity 25 on the lower mold 14 with high pressure. The pouring temperature is 680°C, the mold temperature is 200°C, and the injection speed is 3.4m / s. The magnesium alloy melt in the vacuum cavity 37 is die-cast into a magnesium alloy back plate casting 22. This embodiment can die-cast two magnesium alloy back plate castings 22 at the same time.

[0035] (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 pipe 602. The water cooled by the coolant in the cooling cavity 19 flows into the chiller through the circulation pipe 604 for circulation.

[0036] (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, and the output end of the third electric cylinder 23 drives the top mold plate 24 to move upward in the vertical direction. The multiple top die heads 26 on the top mold plate 24 eject the magnesium alloy back plate casting 22 in the cavity 25, thereby facilitating the demolding of the magnesium alloy back plate casting 22.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A magnesium alloy back plate integrated die-casting mold, characterized in that: A plurality of support columns (9) are arranged on the fifth support plate (16); a third support plate (8) is arranged on the top of the plurality of support columns (9); a first electric cylinder (4) is arranged on the third support plate (8) for driving the fourth support plate (10) to move along the vertical direction on the support column (9); the bottom of the fourth support plate (10) is fixedly connected to the upper mold (12) via a plurality of second connecting rods (11); the upper mold (12) is located below the fourth support plate (10); cores (20) are arranged on both sides of the bottom of the upper mold (12); shielding plates (31) located above the core (20) are 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); A plurality of fixed sleeves (15) are arranged on the upper side of the fifth support plate (16), a lower mold (14) is arranged on the top of the plurality of fixed sleeves (15), the lower mold (14) is located above the fifth support plate (16), the lower mold (14) is located below the upper mold (12), cavities (25) located below the core (20) are arranged on both sides of the lower mold (14), two first through holes (27) are arranged on the lower mold (14) and are connected to the output end of the pipeline (17), and magnesium alloy melt flows in the pipeline (17). A first feed port (28) is processed on the inner circumferential side wall of each first through hole (27), a flow channel (36) interconnected with the first feed port (28) is processed inside the lower mold (14), and a second feed port (29) interconnected with the flow channel (36) is processed inside each cavity (25), and the magnesium alloy melt in the pipeline (17) flows into the cavity (25) through the first feed port (28), the flow channel (36), and the second feed port (29) in sequence to be die-casted into a magnesium alloy back plate casting (22).

2. The magnesium alloy back plate integrated die-casting mold according to claim 1, characterized in that: Each of the fixed sleeves (15) is provided with a positioning rod (34) inside, each positioning rod (34) is slidably connected to a sliding sleeve (33) in a vertical direction, a plurality of second through holes (35) penetrating the positioning rods (34) are processed on the lower mold (14), a fifth spring (13) is provided on each positioning rod (34), one end of each fifth spring (13) is fixedly connected to the top of the sliding sleeve (33), and the other end of each fifth spring (13) is fixedly connected to the inside of the second through hole (35), and a plurality of positioning holes (32) respectively engaged with the positioning rods (34) are processed on the upper mold (12).

3. The magnesium alloy back plate integrated die-casting mold according to claim 1, characterized in that: The cooling mechanism (6) is as follows: a first fixed plate (601) and a second fixed plate (603) are arranged at the bottom of the fourth support plate (10); a cooling pipe (602) is arranged on the first fixed plate (601); the input end of the cooling pipe (602) is connected to the output end of the chiller; the output end of the cooling pipe (602) is connected to the input end of the cooling cavity (19); a circulation pipe (604) is arranged on the second fixed plate (603); the output end of the cooling cavity (19) is connected to the input end of the circulation pipe (604); and the output end of the circulation pipe (604) is connected to the input end of the chiller.

4. The magnesium alloy back plate integrated die-casting mold according to claim 1, characterized in that: The upper mold (12) is provided with first side plates (18) on both sides, and a support mechanism (5) for fixing the upper mold (12) and the lower mold (14) is provided 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). The lower mold (14) is provided with second side plates (21) on both sides, and a vacuum pumping mechanism (7) for vacuuming the inside of the vacuum cavity (37) is provided on the second side plates (21). The first side plates (18) are provided with pressure plates (30) that contact the vacuum pumping mechanism (7).

5. The magnesium alloy back plate integrated die-casting mold according to claim 4, characterized in that: The support mechanism (5) comprises: a housing (501) is respectively provided at both ends of a first side plate (18); a motor (508) is provided on the first side plate (18) for driving a connecting disk (509) to rotate; the connecting disk (509) is eccentrically connected to a first connecting rod (507); both ends of the first connecting rod (507) are respectively connected to a first connecting shaft (502); a second connecting shaft (511) is respectively fixedly installed at both ends of each first connecting shaft (502); each second connecting shaft (511) is respectively fixedly connected to a first connecting plate (512); each first connecting plate (512) is respectively fixedly connected to a third connecting shaft (513); each third connecting shaft (513) is respectively fixedly installed with a cam (506); and each third connecting shaft (513) is respectively fixedly installed with a cam (506). (513) are respectively rotatably connected to the inside of the shell (501), and the bottom of each shell (501) is respectively connected to a sliding rod (505) in a vertical sliding direction. The top of each sliding rod (505) is respectively provided with a first contact plate (510) that contacts the cam (506), and the bottom of each sliding rod (505) is respectively provided with a first support plate (503) that contacts the horizontal surface of the second side plate (21). The first support plate (503) is located outside the shell (501), and each sliding rod (505) is respectively provided with a first spring (504), one end of each first spring (504) is respectively fixedly connected to the bottom of the shell (501), and the other end of each first spring (504) is respectively in contact with the first contact plate (510).

6. The magnesium alloy back plate integrated die-casting mold according to claim 4, characterized in that: The vacuum pumping mechanism (7) is as follows: an air channel (38) interconnected with a plurality of vacuum chambers (37) is processed inside the lower mold (14); a vacuum generator (701) interconnected with the air channel (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); each second support plate (708) is slidably connected to a plurality of second slide bars (709) in a vertical direction; the top of each second slide bar (709) is respectively in contact with the bottom of the pressing plate (30); the bottoms of the plurality of second slide bars (709) are fixedly connected to the sliding plate (713); each second slide bar (709) is respectively provided with a third spring (706); one end of each third spring (706) is respectively fixedly connected to the top of the second slide bar (709); and each second support plate (708) is provided with a plurality of second slide bars (709) in a vertical direction. The other ends of the three springs (706) are respectively fixedly connected to the second support plate (708); each second support plate (708) is slidably connected to a third slide bar (710) in a horizontal direction; one end of each third slide bar (710) is respectively provided with a second contact plate (712) that contacts the sliding plate (713); the other end of each third slide bar (710) is fixedly connected to a plurality of second sealing columns (707) via a second connecting plate (714); each second sealing column (707) is respectively slidably connected to the air channel (38); each third slide bar (710) is respectively provided with a fourth spring (711); one end of each fourth spring (711) is respectively fixedly connected to the second contact plate (712); the other end of each fourth spring (711) is respectively 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 the first sealing column (703) via the third connecting plate (715); the first sealing column (703) is slidably connected to the first through hole (27) in a vertical direction; the first sealing column (703) blocks the flow channel (36) and is in communication with the first through hole (27); a plurality of fixing rods (704) are fixedly mounted on the bottom of the lower mold (14); the third connecting plate (715) is slidably connected to the plurality of fixing rods (704) in a vertical direction; each fixing rod (704) is respectively provided with a second spring (702); 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).

7. The magnesium alloy back plate integrated die-casting mold according to claim 6, characterized in that: 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). The first vertical plate (7132) is arranged on one side of the horizontal plate (7131). The first vertical plate (7132) is sequentially arranged 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 median perpendicular line of the first vertical plate (7132), the median perpendicular line of the second vertical plate (7134) and the median perpendicular line of the third vertical plate (7136) are parallel to each other, the median perpendicular line of the first vertical plate (7132) and the median perpendicular line of the third vertical plate (7136) are the same vertical line, the second vertical plate (7134) is located on one side of the first vertical plate (7132) and the third vertical plate (7136), respectively, and the first vertical plate (7132), the second vertical plate (7134) and the third vertical plate (7136) respectively contact the second contact plate (712).

8. The magnesium alloy back plate integrated die-casting mold according to claim 1, characterized in that: Third electric cylinders (23) are respectively arranged on both sides of the fifth support plate (16), and output ends of the third electric cylinders (23) are respectively fixedly connected to the top mold plate (24), and the top mold plate (24) is provided with a plurality of top die heads (26) for ejecting the magnesium alloy back plate casting (22) formed in the mold cavity (25).

9. The magnesium alloy back plate integrated die-casting mold according to claim 1, characterized in that: A first support frame (1) is provided on one side of the fifth support plate (16), a melting furnace (2) is provided on the first support frame (1), magnesium alloy melt is contained in the melting furnace (2), an output end of the melting furnace (2) is connected to an input end of the pipeline (17), and a hydraulic cylinder (3) is provided on the melting furnace (2) for pushing the magnesium alloy melt in the melting furnace (2) to the pipeline (17).

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