Die-casting die for forming aluminum alloy die casting

Abstract

The invention relates to the technical field of die casting, in particular to a die-casting die for forming aluminum alloy die castings, which comprises an upper die and a lower die, the die further comprises a cooling unit, the cooling unit comprises an upper cooling pipeline arranged in the upper die and a lower cooling pipeline arranged in the lower die, cooling liquid is stored in the upper cooling pipeline and the lower cooling pipeline, a plurality of lifting grooves are formed in the bottom of the upper die in the vertical direction, and an upper die cavity is formed in the lower portion of the upper die. The lifting grooves are evenly distributed around an upper mold cavity of the upper mold, a lifting pipe is movably arranged on the upper portion of the lower mold in the vertical direction, the highest position and the lowest position are arranged on the moving path of the lifting pipe, and communicating sleeves are movably arranged in the lifting grooves in the vertical direction. A communicating hole communicating with the upper cooling pipeline is formed in the side wall of the communicating sleeve in a penetrating mode. According to the cooling device, the uniformity of the aluminum alloy die casting during cooling is guaranteed, and the risk of deformation of the aluminum alloy die casting during die opening is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of die casting, in particular to a die casting mould for forming aluminium alloy die castings. Background Art

[0002] The size of existing aluminum alloy die-castings has gradually increased. During the die-casting process, due to the large flow rate of aluminum liquid and limited die-casting pressure, defects such as pores or shrinkage holes are easily generated during the die-casting process, resulting in the aluminum alloy die-castings failing to meet factory requirements.

[0003] Chinese patent application CN118751888A discloses a die-casting mold and a die-casting method for forming aluminum alloy die-castings, wherein the die-casting mold includes a movable mold and a fixed mold, wherein the movable mold can move relative to the fixed mold to form a cavity, a runner and a plurality of overflow cavities, wherein the fixed mold has a pressure chamber, wherein the pressure chamber, the runner, the cavity and one end of the plurality of overflow cavities are connected in sequence, and a pressure head is arranged in the pressure chamber; the runner includes a straight runner, a plurality of main cross runners, a plurality of auxiliary cross runners and a plurality of inner gates, wherein one end of the straight runner is connected to the pressure chamber, and a plurality of One end of the main runner is connected to the other end of the straight runner, one end of the plurality of auxiliary runners is connected to the other end of the corresponding main runner, the other end of each auxiliary runner is connected to the mold cavity through the corresponding ingates, and the cross-sectional areas of the sprue, the main runner, the auxiliary runner and the ingates decrease successively, the cross-sectional area of ​​the straight runner is 10-30 times the cross-sectional area of ​​the ingates, the cross-sectional area of ​​one end of the overflow cavity is 0.4-0.9 times the cross-sectional area of ​​the ingates, and the diameter of the ingates is 3-5mm.

[0004] The above scheme reduces the generation of bubbles by reducing the flow rate of aluminum liquid, but the aluminum liquid still needs to be cooled after injection. Existing die-casting molds are mostly composed of two molds, and the two molds are combined to form a mold cavity for injecting aluminum liquid. However, the existing cooling units are mostly set inside the mold, and there is no cooling unit distribution between the two molds, that is, the cooling unit cannot completely wrap the mold cavity after the mold is completed, resulting in poor cooling effect. In addition, this will also slow down the cooling speed of the aluminum liquid between the two molds, and the strength of the die-casting is lower when the temperature is high, which is easy to cause damage to the edge of the die-casting when the mold is separated. Summary of the invention

[0005] In view of the above problems, a die-casting mold for forming aluminum alloy die-casting parts is provided. By arranging a lifting pipe and a connecting sleeve, the lifting pipe and the connecting sleeve are connected after the upper mold and the lower mold are closed, and the coolant in the upper cooling pipeline can flow into the lower cooling pipeline through the lifting pipe and the connecting sleeve, so that the coolant can also flow through the connection between the upper mold and the lower mold, so that the coolant completely wraps the mold cavity after the mold is closed.

[0006] In order to solve the problems of the prior art, the present invention provides a die-casting mold for forming aluminum alloy die-castings, comprising an upper mold and a lower mold; and further comprising a cooling unit, the cooling unit comprising an upper cooling pipeline arranged in the upper mold and a lower cooling pipeline arranged in the lower mold, coolant being stored in both the upper cooling pipeline and the lower cooling pipeline, a plurality of lifting grooves are provided in the vertical direction at the bottom of the upper mold, an upper mold cavity is provided at the lower part of the upper mold, the lifting grooves are evenly arranged around the upper mold cavity of the upper mold, a lifting pipe is provided in the upper part of the lower mold for movement in the vertical direction, and has a highest position and a lowest position on the moving path of the lifting pipe, a connecting sleeve is provided in the vertical direction for movement in the lifting groove, a connecting hole connected with the upper cooling pipeline is provided through the side wall of the connecting sleeve, after the lifting pipe rises and contacts with the end of the connecting sleeve, the lifting pipe drives the connecting sleeve to rise synchronously, before the upper mold and the lower mold are molded together, the lifting pipe is located at the lowest position, the connecting hole is disconnected from the upper cooling pipeline, after the upper mold and the lower mold are molded together, the lifting pipe rises to the highest position, and the connecting hole is connected with the upper cooling pipeline.

[0007] Preferably, a lower mold cavity is provided on the upper part of the lower mold, and a cooling cavity is provided around the lower mold cavity. The cooling cavity is connected with the lower cooling pipeline. The coolant flows into the connecting sleeve from the upper cooling pipeline, enters the lower cooling pipeline through the lifting pipe, and then enters the cooling cavity. A liquid outlet is provided on the side wall of the cooling cavity, and the coolant is discharged from the liquid outlet.

[0008] Preferably, a bracket is fixedly installed in the lifting tube, a blocking hole is arranged at the upper part of the lifting tube, a blocking ball is arranged below the blocking hole, a first gap exists between the blocking ball and the bracket, a first spring is arranged in the vertical direction in the first gap, and both ends of the first spring are fixedly connected to the blocking ball and the bracket respectively.

[0009] Preferably, a first corrugated sleeve is provided on the outside of the first spring, two ends of the first corrugated sleeve are respectively fixedly connected to the blocking ball and the bracket, and a compression chamber is formed in the first corrugated sleeve, which is communicated with the outside.

[0010] Preferably, a push rod is fixedly provided at the bottom of the lifting groove in the vertical direction, and the push rod vertically passes through the connecting sleeve. When the upper part of the lifting pipe is not in contact with the lower part of the connecting sleeve, the lower end height of the push rod is lower than the lower end height of the connecting sleeve.

[0011] Preferably, a plurality of first sealing plates are evenly and fixedly arranged on the peripheral wall of the push rod around the axis of the push rod, there are gaps between adjacent first sealing plates, a second sealing plate is arranged in the gap, the second sealing plate is fixedly arranged on the inner wall of the connecting sleeve, the first sealing plate and the second sealing plate are both fan-shaped structures, when the lifting tube does not lift the connecting sleeve, the bottom end face of the second sealing plate is coplanar with the bottom end face of the connecting sleeve, and the bottom of the connecting sleeve is completely blocked.

[0012] Preferably, there is a second gap between the lifting groove and the connecting sleeve, and a second spring is arranged in the second gap along the vertical direction, and two ends of the second spring are fixedly connected to the bottom of the lifting groove and the upper part of the connecting sleeve respectively.

[0013] Preferably, a limit plate is fixedly provided on the push rod, and the limit plate is located in the connecting sleeve. When the connecting sleeve is not lifted up by the lifting tube, the upper part of the limit plate contacts the top of the connecting sleeve.

[0014] Preferably, a second corrugated sleeve is vertically arranged between the lifting pipe and the bottom of the cooling chamber, the lifting pipe is connected with the lower cooling pipeline through the second corrugated sleeve, and a lifting unit for driving the lifting pipe to move in a vertical direction is arranged on one side of the lifting pipe.

[0015] Preferably, the lifting unit includes an adsorption plate fixedly arranged on the side wall of the lifting tube, a first electromagnet is arranged above the adsorption plate, the first electromagnet is fixedly arranged on the side wall of the cooling chamber, a second electromagnet is arranged below the adsorption plate, the second electromagnet is fixedly arranged on the side wall of the cooling chamber, and only one of the first electromagnet and the second electromagnet is in a power-on state at a time.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. During cooling, the upper mold and the lower mold are close to each other and the mold is closed. At this time, the lifting tube in the lower mold is in the lowest position, and the upper end surface of the lifting tube is higher than the upper end surface of the lower mold. After the upper mold and the lower mold are closed, the upper end of the lifting tube slides into the lifting groove, but the upper end of the lifting tube does not contact the lower end of the connecting sleeve. Then the lifting tube starts to rise in the vertical direction. Rubber rings are provided at the upper end of the lifting tube and the lower end of the connecting sleeve. When the rubber ring at the upper end of the lifting tube contacts the rubber ring at the lower end of the connecting sleeve, the lifting tube can push the connecting sleeve up. At this time, the connecting sleeve and the lifting pipe are in a synchronous rising state, and the connecting hole on the side wall of the connecting sleeve rises synchronously with the connecting sleeve. When the lifting pipe rises to the highest position, the upper cooling pipeline is connected with the connecting hole, and the coolant in the upper cooling pipeline flows into the connecting sleeve through the connecting hole, and then the coolant flows from the connecting sleeve into the lifting pipe, and finally enters the lower cooling pipeline. By setting the lifting pipe and the connecting sleeve, it is achieved that after the upper mold and the lower mold are closed, the coolant can flow through the connection between the upper mold and the lower mold, so that the coolant can completely wrap the mold cavity formed by the upper mold and the lower mold, thereby ensuring the uniformity of the aluminum alloy die-casting during cooling and reducing the risk of deformation of the aluminum alloy die-casting when the mold is opened.

[0018] 2. A cooling cavity is arranged around the lower mold cavity of the lower mold, and a lifting tube is arranged in the cooling cavity. The cooling cavity is communicated with the lower cooling pipeline, and the cooling cavity is filled with coolant. The coolant in the lower cooling pipeline is discharged into the cooling cavity and then directly discharged into the storage box, and the coolant capacity in the cooling cavity is greater than the coolant capacity in the lifting tube. A circle of cooling cavity is arranged around the lower mold cavity and the lifting tube is placed in the cooling cavity, which avoids the influence of the temperature in the lower mold cavity on the coolant in the lifting tube. This is because the coolant in the cooling cavity can not only cool down the lower mold cavity, but also form a heat insulation effect on the lifting tube, thereby ensuring the cooling effect of the coolant in the lifting tube.

[0019] 3. A blocking ball is arranged on the lifting tube to block the blocking hole located at the upper part of the lifting tube. During the rising process of the lifting tube, the blocking ball is first pushed open by the push rod, and after the lifting tube contacts the bottom of the connecting sleeve, the first sealing plate and the second sealing plate are staggered, and the coolant in the connecting sleeve can leak out. When the lifting tube descends, the first sealing plate and the second sealing plate in the connecting sleeve can reseal the bottom of the connecting sleeve, thereby preventing the coolant in the connecting sleeve from dripping when the lifting tube descends. At the same time, the blocking ball in the lifting tube blocks the upper part of the lifting tube, thereby preventing external dust from entering the lifting tube and reducing the pollution of the coolant by external dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a die-casting mold for forming aluminum alloy die-castings; Figure 2 is a side view of a die casting die for forming aluminum alloy die castings; Figure 3 It is a die-casting mold for forming aluminum alloy die-casting parts. Figure 2 Schematic cross-sectional view at AA in the middle; Figure 4 It is a cutaway perspective schematic diagram of a die casting die for forming aluminum alloy die castings; Figure 5 It is a die-casting mold for forming aluminum alloy die-casting parts. Figure 4 A partial enlarged schematic diagram of point B in the middle; Figure 6 It is a die-casting mold for forming aluminum alloy die-casting parts. Figure 4 A partial enlarged schematic diagram of point C in the middle; Figure 7 It is a cutaway stereoscopic schematic diagram of a connecting hole of a die-casting mold for forming an aluminum alloy die-casting when it is connected to an upper cooling pipeline; Figure 8 It is a die-casting mold for forming aluminum alloy die-casting parts. Figure 7 A partial enlarged schematic diagram of point D in the middle; Fig. 9It is a three-dimensional schematic diagram of an upper die of a die-casting die for forming aluminum alloy die-castings; Fig.10 It is a three-dimensional schematic diagram of a die-casting die for forming aluminum alloy die-castings with the upper die removed; Fig.11 It is a cutaway stereoscopic schematic diagram of a die-casting die for forming aluminum alloy die-castings with the upper die removed; Fig.12 It is a die-casting mold for forming aluminum alloy die-casting parts. Fig.11 Schematic diagram of the cutaway view at point E in the middle.

[0021] The numbers in the figure are: 1. upper mold; 11. lifting groove; 2. lower mold; 3. cooling unit; 31. upper cooling pipeline; 32. lower cooling pipeline; 33. lifting pipe; 331. blocking ball; 332. first spring; 333. bracket; 334. first corrugated sleeve; 34. connecting sleeve; 341. connecting hole; 342. ejector rod; 343. first sealing plate; 344. second sealing plate; 35. cooling chamber; 36. second spring; 37. limit plate; 38. lifting unit; 381. adsorption plate; 382. first electromagnet; 383. second electromagnet; 39. second corrugated sleeve. DETAILED DESCRIPTION

[0022] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Reference Figure 1-Figure 5 , Figure 7 , Fig. 9 , Fig.10 and Fig.11A die-casting mold for aluminum alloy die-castings, comprising an upper mold 1 and a lower mold 2; and a cooling unit 3, the cooling unit 3 comprising an upper cooling pipeline 31 arranged in the upper mold 1 and a lower cooling pipeline 32 arranged in the lower mold 2, both the upper cooling pipeline 31 and the lower cooling pipeline 32 contain cooling liquid, a plurality of lifting grooves 11 are provided in the vertical direction at the bottom of the upper mold 1, an upper mold cavity is provided at the lower part of the upper mold 1, the lifting grooves 11 are evenly arranged around the upper mold cavity of the upper mold 1, a lifting pipe 33 is provided in the upper part of the lower mold 2 for movement in the vertical direction, and a moving path of the lifting pipe 33 is provided. The upper portion has a highest position and a lowest position, and a connecting sleeve 34 is arranged in the lifting groove 11 to move along the vertical direction. A connecting hole 341 connected to the upper cooling pipeline 31 is penetrated through the side wall of the connecting sleeve 34. After the lifting pipe 33 rises and contacts with the end of the connecting sleeve 34, the lifting pipe 33 drives the connecting sleeve 34 to rise synchronously. Before the upper mold 1 and the lower mold 2 are closed, the lifting pipe 33 is located at the lowest position, and the connecting hole 341 is disconnected from the upper cooling pipeline 31. After the upper mold 1 and the lower mold 2 are closed, the lifting pipe 33 rises to the highest position, and the connecting hole 341 is connected to the upper cooling pipeline 31.

[0024] In the existing die-casting mold, an upper mold cavity is provided at the bottom of the upper mold 1, and a lower mold cavity is provided at the upper part of the lower mold 2. When the upper mold 1 and the lower mold 2 are closed, the upper mold cavity and the lower mold cavity form a complete die-casting cavity, and an upper cooling pipeline 31 is provided in the upper mold 1, and a lower cooling pipeline 32 is provided in the lower mold 2. After the upper mold 1 and the lower mold 2 are closed, the upper cooling pipeline 31 and the lower cooling pipeline 32 cool the upper mold 1 and the lower mold 2 respectively. However, at the connection between the upper mold 1 and the lower mold 2, neither the upper cooling pipeline 31 nor the lower cooling pipeline 32 can cool the position between the upper mold 1 and the lower mold 2, which causes the temperature of the aluminum alloy die-casting part near the connection between the upper mold 1 and the lower mold 2 to be higher, and the higher the temperature, the higher the risk of deformation of the aluminum alloy die-casting when the mold is opened.

[0025] In order to avoid the above situation, the cooling unit 3 is redesigned. The specific working principle of the cooling unit 3 is as follows: a storage box is provided on one side of the die-casting mold, and coolant is stored in the storage box. The upper cooling pipeline 31 is interconnected with the storage box, and the lower cooling pipeline 32 is also interconnected with the storage box. The storage box first supplies the coolant to the upper cooling pipeline 31, and then returns to the storage box through the lower cooling pipeline 32. During cooling, the upper mold 1 and the lower mold 2 approach each other and complete the mold closing. At this time, the lifting tube 33 located in the lower mold 2 is in the lowest position, and the upper end surface of the lifting tube 33 is higher than the upper end surface of the lower mold 2. After the upper mold 1 and the lower mold 2 are closed, the upper end of the lifting tube 33 slides into the lifting groove 11, but the upper end of the lifting tube 33 does not contact the lower end of the connecting sleeve 34. Then the lifting tube 33 starts to rise in the vertical direction. Rubber rings are provided at the upper end of the lifting tube 33 and the lower end of the connecting sleeve 34. When the rubber ring at the upper end of the lifting tube 33 contacts the rubber ring at the lower end of the connecting sleeve 34, the lifting tube 33 can push the connecting sleeve 34 to rise. At this time, the connecting sleeve 34 and the lifting pipe 33 are in a synchronous rising state, and the connecting hole 341 located on the side wall of the connecting sleeve 34 rises synchronously with the connecting sleeve 34. When the lifting pipe 33 rises to the highest position, the upper cooling pipeline 31 is connected with the connecting hole 341, and the coolant in the upper cooling pipeline 31 flows into the connecting sleeve 34 through the connecting hole 341. Then the coolant flows from the connecting sleeve 34 into the lifting pipe 33 and finally enters the lower cooling pipeline 32. However, the coolant in the lower cooling pipeline 32 will not be discharged directly. A cooling cavity 35 is arranged around the lower mold cavity of the lower mold 2. The lifting pipe 33 is arranged in the cooling cavity 35. The cooling cavity 35 is connected with the lower cooling pipeline 32. The cooling cavity 35 is filled with coolant. The coolant in the lower cooling pipeline 32 is directly discharged into the storage box after being discharged into the cooling cavity 35, and the coolant capacity in the cooling cavity 35 is greater than the coolant capacity in the lifting pipe 33. A circle of cooling cavity 35 is arranged around the lower die cavity and the lifting tube 33 is placed in the cooling cavity 35, so as to avoid the influence of the temperature in the lower die cavity on the coolant in the lifting tube 33. This is because the coolant in the cooling cavity 35 can not only cool down the lower die cavity, but also form a heat insulation effect on the lifting tube 33, thereby ensuring the cooling effect of the coolant in the lifting tube 33. By providing the lifting tube 33 and the connecting sleeve 34, it is achieved that after the upper die 1 and the lower die 2 are closed, the coolant can flow through the connection between the upper die 1 and the lower die 2, so that the coolant can completely wrap the die cavity formed by the upper die 1 and the lower die 2, thereby ensuring the uniformity of the aluminum alloy die casting when cooling, and reducing the risk of deformation of the aluminum alloy die casting when opening the die.

[0026] Reference Fig.11 and Fig.12: A lower mold cavity is arranged on the upper part of the lower mold 2, and a cooling cavity 35 is arranged around the lower mold cavity. The cooling cavity 35 is connected with the lower cooling pipeline 32. The coolant flows into the connecting sleeve 34 from the upper cooling pipeline 31, enters the lower cooling pipeline 32 through the lifting pipe 33, and then enters the cooling cavity 35. A liquid outlet is opened on the side wall of the cooling cavity 35, and the coolant is discharged from the liquid outlet.

[0027] Reference Figure 5 and Figure 6 : A bracket 333 is fixedly installed in the lifting tube 33, a blocking hole is arranged at the upper part of the lifting tube 33, a blocking ball 331 is arranged below the blocking hole, a first gap exists between the blocking ball 331 and the bracket 333, a first spring 332 is arranged in the vertical direction in the first gap, and both ends of the first spring 332 are fixedly connected with the blocking ball 331 and the bracket 333 respectively.

[0028] When cooling the aluminum alloy die casting, the coolant in the upper cooling pipeline 31 enters the connecting sleeve 34 through the connecting hole 341, and enters the lower cooling pipeline 32 through the lifting tube 33. In the process of the coolant entering the lifting tube 33 from the connecting sleeve 34, the coolant needs to push open the blocking ball 331 blocked on the blocking hole, and the first spring 332 set between the blocking ball 331 and the bracket 333 is compressed. When the die casting is completed, the upper mold 1 is lifted, and the blocking ball 331 blocks the blocking hole under the pressure of the first spring 332, so as to avoid the situation that the external dust enters the lifting tube 33 through the blocking hole after the upper mold 1 and the lower mold 2 are separated.

[0029] Reference Figure 6 A first corrugated sleeve 334 is sleeved on the outside of the first spring 332. Both ends of the first corrugated sleeve 334 are fixedly connected to the blocking ball 331 and the bracket 333 respectively. A compression chamber is formed in the first corrugated sleeve 334, and the compression chamber is communicated with the outside.

[0030] In this way, the first spring 332 can be compressed normally. The arrangement of the connecting pipeline between the compression chamber and the outside is the existing technology and will not be repeated here. A first corrugated sleeve 334 is provided on the outside of the first spring 332 to prevent the first spring 332 from being continuously impacted by the flowing coolant, thereby extending the service life of the first spring 332.

[0031] Reference Figure 5 : A push rod 342 is fixedly arranged at the bottom of the lifting groove 11 in the vertical direction. The push rod 342 vertically penetrates the connecting sleeve 34. When the upper part of the lifting tube 33 is not in contact with the lower part of the connecting sleeve 34, the lower end height of the push rod 342 is lower than the lower end height of the connecting sleeve 34.

[0032] Reference Figure 5 and Figure 8: A plurality of first sealing plates 343 are evenly and fixedly arranged on the peripheral wall of the push rod 342 around the axis of the push rod 342, and there is a gap between adjacent first sealing plates 343, and a second sealing plate 344 is arranged in the gap. The second sealing plate 344 is fixedly arranged on the inner wall of the connecting sleeve 34, and the first sealing plate 343 and the second sealing plate 344 are both fan-shaped structures. When the lifting tube 33 does not lift the connecting sleeve 34, the bottom end face of the second sealing plate 344 is coplanar with the bottom end face of the connecting sleeve 34, and the bottom of the connecting sleeve 34 is completely blocked.

[0033] When the upper part of the lifting pipe 33 has not yet contacted the lower part of the connecting sleeve 34, the second sealing plate 344 at the bottom of the connecting sleeve 34 and the first sealing plate 343 arranged on the top rod 342 form an annular structure together. At this time, the coolant in the connecting sleeve 34 is sealed in the connecting sleeve 34 and cannot be discharged. When the lifting pipe 33 rises, the vertically arranged top rod 342 will first contact the blocking ball 331 in the lifting pipe 33. As the lifting pipe 33 continues to rise, the blocking ball 331 is pushed by the top rod 342. 42 is pushed open. When the lifting pipe 33 contacts the bottom of the connecting sleeve 34 and the connecting sleeve 34 is pushed further, the connecting sleeve 34 drives the second sealing plate 344 to rise, and the first sealing plate 343 and the second sealing plate 344 are staggered. When the connecting hole 341 is connected with the upper cooling pipeline 31, the coolant in the upper cooling pipeline 31 can flow into the connecting sleeve 34 through the connecting hole 341, and flow into the lifting pipe 33 from the blocking hole through the staggered position of the first sealing plate 343 and the second sealing plate 344. In this way, the smooth flow of the coolant is achieved. When the die-casting is completed and the upper mold 1 and the lower mold 2 are separated, the lifting tube 33 drops from the highest position to the lowest position. At this time, the blocking ball 331 blocks the blocking hole of the lifting tube 33. At the same time, the first sealing plate 343 and the second sealing plate 344 are in the same plane. The first sealing plate 343 and the second sealing plate 344 seal the coolant in the connecting sleeve 34. When the lifting tube 33 is separated from the connecting sleeve 34, since the bottom height of the push rod 342 is lower than the bottom height of the connecting sleeve 34, after the lifting tube 33 is separated from the connecting sleeve 34, the push rod 342 is still in the state of pushing open the blocking ball 331. The lifting tube 33 is still located in the lifting groove 11 of the upper mold 1 at this time. The coolant between the lifting tube 33 and the connecting sleeve 34 flows into the lifting tube 33 from the blocking hole, thereby avoiding the coolant dripping when the connecting sleeve 34 is separated from the lifting tube 33.

[0034] Reference Figure 5 and Fig. 9 : There is a second gap between the lifting groove 11 and the connecting sleeve 34, and a second spring 36 is arranged in the second gap along the vertical direction. The two ends of the second spring 36 are fixedly connected to the bottom of the lifting groove 11 and the upper part of the connecting sleeve 34 respectively.

[0035] When the connecting sleeve 34 is not lifted by the lifting tube 33, the second spring 36 is in an uncompressed state, and when the connecting sleeve 34 is lifted, the second spring 36 begins to compress. When the lifting tube 33 descends, the return force of the second spring 36 acts on the connecting sleeve 34, so that the connecting sleeve 34 can descend synchronously with the lifting tube 33, avoiding the lifting tube 33 from sliding out of the lifting groove 11 while the connecting sleeve 34 is still in a descending state. At this time, the first sealing plate 343 and the second sealing plate 344 in the connecting sleeve 34 cannot completely seal the connecting sleeve 34, and the coolant is likely to leak.

[0036] Reference Figure 5 A limit plate 37 is fixedly arranged on the top rod 342, and the limit plate 37 is located in the connecting sleeve 34. When the connecting sleeve 34 is not lifted by the lifting tube 33, the upper part of the limit plate 37 contacts the top of the connecting sleeve 34.

[0037] The limit plate 37 limits the minimum height of the connecting sleeve 34 when it descends, thereby preventing the gravity of the connecting sleeve 34 from stretching the second spring 36 after the lifting tube 33 is separated from the connecting sleeve 34, so that the second spring 36 is in a stretched state when the die-casting mold is not in use, thereby extending the service life of the second spring 36.

[0038] Reference Figure 6 , Fig.11 and Fig.12 A second corrugated sleeve 39 is vertically arranged between the lifting pipe 33 and the bottom of the cooling chamber 35. The lifting pipe 33 is connected to the lower cooling pipeline 32 through the second corrugated sleeve 39. A lifting unit 38 for driving the lifting pipe 33 to move in a vertical direction is arranged on one side of the lifting pipe 33.

[0039] Reference Fig.12 The lifting unit 38 includes an adsorption plate 381 fixedly arranged on the side wall of the lifting tube 33, a first electromagnet 382 is arranged above the adsorption plate 381, the first electromagnet 382 is fixedly arranged on the side wall of the cooling chamber 35, a second electromagnet 383 is arranged below the adsorption plate 381, the second electromagnet 383 is fixedly arranged on the side wall of the cooling chamber 35, and only one of the first electromagnet 382 and the second electromagnet 383 is in the power-on state at a time.

[0040] When the first electromagnet 382 is energized, the adsorption plate 381 drives the lifting tube 33 to rise. When the second electromagnet 383 is energized, the adsorption plate 381 drives the lifting tube 33 to descend. Since the cooling chamber 35 is filled with coolant, if the second electromagnet 383 does not adsorb the adsorption plate 381 and cause the lifting tube 33 to descend, the lifting tube 33 will descend at a low speed due to its own gravity. Since the lifting tube 33 can move in the vertical direction, the second corrugated sleeve 39 between the lifting tube 33 and the lower cooling pipeline 32 can be stretched or compressed as the lifting tube 33 rises and falls.

[0041] Working principle: During cooling, the upper mold 1 and the lower mold 2 approach each other and complete the mold closing. At this time, the lifting tube 33 located in the lower mold 2 is in the lowest position, and the upper end surface of the lifting tube 33 is higher than the upper end surface of the lower mold 2. After the upper mold 1 and the lower mold 2 are closed, the upper end of the lifting tube 33 slides into the lifting groove 11, but the upper end of the lifting tube 33 does not contact the lower end of the connecting sleeve 34. Then the lifting tube 33 starts to rise in the vertical direction. Rubber rings are provided at the upper end of the lifting tube 33 and the lower end of the connecting sleeve 34. When the rubber ring at the upper end of the lifting tube 33 contacts the rubber ring at the lower end of the connecting sleeve 34, the lifting tube 33 can push the connecting sleeve 34 to rise. At this time, the connecting sleeve 34 and the lifting pipe 33 are in a synchronous rising state, and the connecting hole 341 located on the side wall of the connecting sleeve 34 rises synchronously with the connecting sleeve 34. When the lifting pipe 33 rises to the highest position, the upper cooling pipeline 31 is connected with the connecting hole 341, and the coolant in the upper cooling pipeline 31 flows into the connecting sleeve 34 through the connecting hole 341. Then the coolant flows from the connecting sleeve 34 into the lifting pipe 33 and finally enters the lower cooling pipeline 32. However, the cooling pipeline located in the lower cooling pipeline 32 will not be discharged directly. A cooling cavity 35 is arranged around the lower mold cavity of the lower mold 2. The lifting pipe 33 is arranged in the cooling cavity 35. The cooling cavity 35 is connected with the lower cooling pipeline 32. The cooling cavity 35 is filled with coolant. The coolant in the lower cooling pipeline 32 is directly discharged into the storage box after being discharged into the cooling cavity 35, and the coolant capacity in the cooling cavity 35 is greater than the coolant capacity in the lifting pipe 33. A circle of cooling cavity 35 is arranged around the lower die cavity and the lifting tube 33 is placed in the cooling cavity 35, so as to avoid the influence of the temperature in the lower die cavity on the coolant in the lifting tube 33. This is because the coolant in the cooling cavity 35 can not only cool down the lower die cavity, but also form a heat insulation effect on the lifting tube 33, thereby ensuring the cooling effect of the coolant in the lifting tube 33. By providing the lifting tube 33 and the connecting sleeve 34, it is achieved that after the upper die 1 and the lower die 2 are closed, the coolant can flow through the connection between the upper die 1 and the lower die 2, so that the coolant can completely wrap the die cavity formed by the upper die 1 and the lower die 2, thereby ensuring the uniformity of the aluminum alloy die casting when cooling, and reducing the risk of deformation of the aluminum alloy die casting when opening the die.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A die-casting die for forming an aluminum alloy die-casting, comprising an upper die (1) and a lower die (2); It is characterized in that The mold assembly further comprises a cooling unit (3), the cooling unit (3) comprising an upper cooling pipeline (31) arranged in the upper mold (1) and a lower cooling pipeline (32) arranged in the lower mold (2), the upper cooling pipeline (31) and the lower cooling pipeline (32) both containing cooling liquid, a plurality of lifting grooves (11) being provided in a vertical direction at the bottom of the upper mold (1), an upper mold cavity being provided at the lower part of the upper mold (1), the lifting grooves (11) being evenly arranged around the upper mold cavity of the upper mold (1), a lifting pipe (33) being provided in a vertically movable manner at the upper part of the lower mold (2), and having a highest position and a lowest position on a moving path of the lifting pipe (33), and a lifting pipe (33) being provided in a vertically movable manner. A connecting sleeve (34) is arranged in the groove (11) to move in the vertical direction. A connecting hole (341) connected to the upper cooling pipeline (31) is formed through a side wall of the connecting sleeve (34). After the lifting pipe (33) rises and contacts the end of the connecting sleeve (34), the lifting pipe (33) drives the connecting sleeve (34) to rise synchronously. Before the upper mold (1) and the lower mold (2) are closed, the lifting pipe (33) is located at the lowest position and the connecting hole (341) is disconnected from the upper cooling pipeline (31). After the upper mold (1) and the lower mold (2) are closed, the lifting pipe (33) rises to the highest position and the connecting hole (341) is connected to the upper cooling pipeline (31).

2. The die-casting mold for forming aluminum alloy die-castings according to claim 1, characterized in that: A lower mold cavity is arranged at the upper part of the lower mold (2), and a cooling cavity (35) is arranged around the lower mold cavity. The cooling cavity (35) is connected to the lower cooling pipeline (32). Cooling liquid flows from the upper cooling pipeline (31) into the connecting sleeve (34), enters the lower cooling pipeline (32) through the lifting pipe (33), and then enters the cooling cavity (35). A liquid outlet is opened on the side wall of the cooling cavity (35), and the cooling liquid is discharged from the liquid outlet.

3. The die-casting mold for forming aluminum alloy die-castings according to claim 1, characterized in that: A bracket (333) is fixedly arranged in the lifting tube (33), a blocking hole is arranged at the upper part of the lifting tube (33), a blocking ball (331) is arranged below the blocking hole, a first gap exists between the blocking ball (331) and the bracket (333), a first spring (332) is arranged in the first gap along the vertical direction, and two ends of the first spring (332) are respectively fixedly connected to the blocking ball (331) and the bracket (333).

4. The die-casting mold for forming aluminum alloy die-castings according to claim 3, characterized in that: A first corrugated sleeve (334) is sleeved on the outside of the first spring (332), and two ends of the first corrugated sleeve (334) are fixedly connected to the blocking ball (331) and the bracket (333) respectively. A compression chamber is formed in the first corrugated sleeve (334), and the compression chamber is communicated with the outside.

5. The die-casting mold for forming aluminum alloy die-castings according to claim 1, characterized in that: A push rod (342) is fixedly arranged at the bottom of the lifting groove (11) in the vertical direction. The push rod (342) vertically penetrates the connecting sleeve (34). When the upper part of the lifting pipe (33) is not in contact with the lower part of the connecting sleeve (34), the lower end height of the push rod (342) is lower than the lower end height of the connecting sleeve (34).

6. The die-casting mold for forming aluminum alloy die-castings according to claim 5, characterized in that: A plurality of first sealing plates (343) are evenly and fixedly arranged on the peripheral wall of the push rod (342) around the axis of the push rod (342), a gap exists between adjacent first sealing plates (343), a second sealing plate (344) is arranged in the gap, and the second sealing plate (344) is fixedly arranged on the inner wall of the connecting sleeve (34), the first sealing plate (343) and the second sealing plate (344) are both fan-shaped structures, and when the lifting tube (33) does not lift the connecting sleeve (34), the bottom end surface of the second sealing plate (344) is coplanar with the bottom end surface of the connecting sleeve (34), and the bottom of the connecting sleeve (34) is completely blocked.

7. The die-casting mold for forming aluminum alloy die-castings according to claim 1, characterized in that: A second gap is provided between the lifting groove (11) and the connecting sleeve (34), and a second spring (36) is arranged in the second gap along the vertical direction. Two ends of the second spring (36) are respectively fixedly connected to the bottom of the lifting groove (11) and the upper part of the connecting sleeve (34).

8. The die-casting mold for forming aluminum alloy die-castings according to claim 5, characterized in that: A limit plate (37) is fixedly arranged on the push rod (342). The limit plate (37) is located in the connecting sleeve (34). When the connecting sleeve (34) is not lifted by the lifting tube (33), the upper part of the limit plate (37) contacts the top of the connecting sleeve (34).

9. The die-casting mold for forming aluminum alloy die-castings according to claim 2, characterized in that: A second corrugated sleeve (39) is vertically arranged between the lifting pipe (33) and the bottom of the cooling chamber (35); the lifting pipe (33) is connected to the lower cooling pipeline (32) through the second corrugated sleeve (39); and a lifting unit (38) for driving the lifting pipe (33) to move in a vertical direction is arranged on one side of the lifting pipe (33).

10. The die-casting mold for forming aluminum alloy die-castings according to claim 9, characterized in that: The lifting unit (38) comprises an adsorption plate (381) fixedly arranged on the side wall of the lifting tube (33); a first electromagnet (382) is arranged above the adsorption plate (381); the first electromagnet (382) is fixedly arranged on the side wall of the cooling chamber (35); a second electromagnet (383) is arranged below the adsorption plate (381); the second electromagnet (383) is fixedly arranged on the side wall of the cooling chamber (35); and only one of the first electromagnet (382) and the second electromagnet (383) is in a powered-on state at a time.

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