A rear end cover casting for an automotive power unit and a manufacturing method thereof

Abstract

The present invention discloses a rear end cover casting of an automotive power device and a manufacturing method, relating to the technical field of metal die casting. In the present invention, a prefabricated part is pre-installed in a forming cavity through a clamping mechanism, so that after die casting production, the main body of the aluminum alloy casting formed by the solidification of the aluminum alloy melt directly wraps around the outer side of the copper tube. With the presence of the copper tube, coolant can be passed through the die-cast rear end cover casting, which is beneficial to improving the heat dissipation efficiency of the power device during subsequent use. And because the cooling water channel is directly formed in the rear cover casting during die casting, the production efficiency of the cooling water cover is greatly improved, and the overall sealing performance of the cooling water channel can be effectively improved, greatly reducing the probability of leakage of the cooling water channel during the use of the rear end cover casting, improving the product quality to a certain extent, and effectively reducing the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of metal die casting, and particularly to a rear end cover casting of an automotive power device and a manufacturing method thereof. Background Art

[0002] In the field of automotive manufacturing, the performance of the power device directly determines the overall operation performance of the vehicle. As a key component of the power device, the quality and performance of the rear end cover are crucial. The rear end cover not only has to bear complex mechanical stresses but also must have good heat dissipation performance to ensure the stable operation of the power device under long-term and high-intensity working conditions.

[0003] When producing the rear end cover casting of the existing automotive power device, it is usually difficult to directly form cooling water channels inside the rear end cover casting. For the forming and processing of the cooling water channels, post-drilling, milling, or split casting methods are mostly used. This makes the production process complex and the processing cost high. Moreover, for the cooling water channels formed by split casting and combined, after splicing, a large number of seals are required at the connection parts. Not only are the assembly steps cumbersome, but the sealing performance of the connection parts is also difficult to guarantee. In the high-temperature working environment of the power device for a long time, leakage is likely to occur at the connection, resulting in coolant leakage and causing serious consequences.

[0004] Therefore, a rear end cover casting of an automotive power device and a manufacturing method thereof are proposed to solve some problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The object of the present invention is to solve the drawbacks in the prior art that it is difficult to directly form cooling water channels inside the rear end cover casting of the automotive power device, which affects both the processing cost and the use stability of the rear end cover casting, and to propose a rear end cover casting of an automotive power device and a manufacturing method thereof.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] An end cover casting device for an automotive power unit, comprising a first die base and a second die base. A forming cavity is provided on the mating surface of the first die base and the second die base. A feeding channel communicating with the forming cavity is provided in the second die base. An annular seat is installed in the second die base, and one side end wall of the annular seat is on the inner end wall of the forming cavity. Two insertion holes are provided in the annular seat. A clamping mechanism is arranged in the annular seat. The clamping mechanism includes chambers provided in the annular seat and symmetrically located on both sides of each insertion hole. The chambers are arranged in a structure inclined to the outer end wall of the annular seat. A piston block is slidably installed in the chambers. A hydraulic oil interface is provided on the outer end wall of the second die base, and the hydraulic oil interface communicates with a plurality of chambers. A preform is preset in the forming cavity, and the preform includes a copper pipe. Two pipe joints respectively fixed and communicated with both ends of the copper pipe are adapted to the insertion holes, and the pipe joints are perpendicular to the copper pipe. The two pipe joints are respectively inserted into the two insertion holes and locked by the clamping mechanism.

[0008] Preferably, the annular seat is rotatably installed in the second die base. An external gear ring is fixedly sleeved on the outer end wall of the annular seat. A first gear meshing with the external gear ring is rotatably installed in the second die base. A servo motor is fixedly installed on the outer end wall of the second die base, and a second gear meshing with the first gear is fixedly installed on the driving shaft of the servo motor.

[0009] Preferably, a plurality of copper sheets are uniformly and fixedly arranged around the copper pipe, and a positioning piece is fixed on the pipe joint.

[0010] Preferably, a first annular groove is provided in the second die base and is arranged around the outside of the annular seat, and the first annular groove is directly communicated with the hydraulic oil interface. A hydraulic oil channel directly communicating with a plurality of chambers is provided on the outer end wall of the annular seat, and the hydraulic oil channel is rotationally communicated with the first annular groove. Two transfer interfaces are provided on the outer end wall of the second die base. Two second annular grooves are provided in the second die base and are arranged around the outside of the annular seat. The two transfer interfaces are respectively directly communicated with the two second annular grooves. The two insertion holes are respectively rotationally communicated with the two second annular grooves.

[0011] Preferably, a frame housing is fixedly installed on the outer end wall of the second die base, and two bearing plates are arranged in the frame housing. A fine sand interface is fixed on each bearing plate. The two fine sand interfaces are respectively arranged corresponding to the two transfer interfaces. The two fine sand interfaces are respectively externally connected to the sand outlet and the sand return port of a fine sand supply device.

[0012] Preferably, a cooling water interface is fixed on each bearing plate. The two cooling water interfaces are respectively arranged corresponding to the two transfer interfaces. The two cooling water interfaces are respectively externally connected to the water outlet and the water return port of a cooling water supply device. The two bearing plates are slidably installed in the frame housing. Two electric push rods are fixedly installed on the frame housing, and the telescopic ends of the two electric push rods are respectively fixedly connected to the two bearing plates.

[0013] Preferably, the fine sand interface connected to the sand outlet and the cooling water interface connected to the water outlet are located on the same bearing plate. An air flow interface corresponding to the adapter is installed on the bearing plate, and the air flow interface is externally connected to an air pump. The air flow interface is arranged between the fine sand interface and the cooling water interface.

[0014] Preferably, for a casting produced by a casting device for the rear end cover of an automotive power device, the outer sides of the copper pipe, pipe joint, copper sheet, and positioning piece are wrapped with an aluminum alloy casting main body, and the aluminum alloy casting main body is die-cast in the molding cavity. Two copper sheets are arranged side by side in the same position, and the positioning pieces fixed on the two copper sheets are connected to each other. The outer end wall of the aluminum alloy casting main body is flush with the outer end wall of the positioning piece.

[0015] Preferably, the copper pipe is integrally arranged in a spiral structure and is embedded in the middle layer position of the aluminum alloy casting main body.

[0016] Preferably, a method for producing a casting by a casting device for the rear end cover of an automotive power device includes the following steps:

[0017] S1. Installation of the prefabricated part: In the state of mold opening, insert the pipe joint into the jack, and then drive the paired piston blocks in the clamping mechanism to approach each other to firmly clamp the pipe joint in the jack. After the mold is closed, the copper pipe is in the middle layer position of the molding cavity.

[0018] S2. Injection of sand for internal support: Through the movement of the telescopic ends of the two electric push rods, control the corresponding connection of the two fine sand interfaces and the two adapters. Through an externally connected fine sand supply device, inject fine sand into the copper pipe for support.

[0019] S3. Stirring during casting: The aluminum alloy melt is injected into the molding cavity through the injection channel. During the injection of the aluminum alloy melt, the servo motor is started. With the meshing transmission of the second gear, the first gear, and the external gear ring, drive the annular seat to drive the prefabricated part to slowly rotate in the molding cavity. When the molding cavity is about to be filled, stop the rotation drive of the prefabricated part and keep the prefabricated part in the pre-set position.

[0020] S4. Die-casting molding: Inject the aluminum alloy melt into the molding cavity under pressure through the injection channel until the molding cavity is filled, and perform a pressure holding operation on the molding cavity, waiting for the casting to cool and solidify.

[0021] S5. Blowing to remove sand: Drive the corresponding bearing plate to move through the electric push rod, control the connection of the air flow interface with one adapter, and the fine sand interface connected to the sand return port of the fine sand supply device still remains connected to the corresponding adapter. Through the air pump externally connected to the air flow interface, blow the fine sand in the copper pipe into the fine sand supply device.

[0022] S6. Inject water for cooling. Drive the corresponding bearing plate to move through the electric push rod, so that the two cooling water interfaces and the two adapter interfaces are correspondingly connected. Through an external cooling water supply device, inject cooling water into the copper pipe in a circulating manner to actively cool the castings after forming;

[0023] S7. Blow water to open the mold and take out the material. After the casting reaches the condition for mold opening and material taking, drive the corresponding bearing plate to move through the electric push rod, so that the air flow interface is reconnected to an adapter interface, and the cooling water interface connected to the water return port of the cooling water supply device still maintains the state of being connected to the corresponding adapter interface. Through the air pump connected to the air flow interface, blow the cooling water in the copper pipe into the cooling water supply device, and then open the mold, release the locking of the clamping mechanism, and complete the demolding and material taking of the casting.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In the present invention, the prefabricated part is pre-installed in the forming cavity through the clamping mechanism, so that after die-casting production, the main body of the aluminum alloy casting formed by the solidification of the aluminum alloy melt is directly wrapped outside the copper pipe. With the presence of the copper pipe, cooling liquid can be introduced into the rear end cover casting formed by die-casting, which is beneficial to improving the heat dissipation efficiency of the power device during subsequent use. And because the cooling water channel is directly formed in the rear cover casting during die-casting, the production efficiency of the cooling water cover is greatly improved, and the overall sealing performance of the cooling water channel can be effectively improved, and the probability of cooling water channel leakage during the use of the rear end cover casting is greatly reduced;

[0026] 2. In the present invention, the annular seat is rotatably installed in the second mold base, and the prefabricated part is connected to the annular seat through the clamping mechanism. During the injection of the aluminum alloy melt, the prefabricated part can be driven to rotate in the forming cavity, and the stirring and disturbance effect is increased through the copper sheet. Not only can the injection of the aluminum alloy melt be made more uniform, but also the efficiency of the bubbles in the aluminum alloy melt being exported outward can be accelerated, which is beneficial to improving the die-casting effect. At the same time, the presence of the copper sheet and the copper pipe form a network structure, which can effectively improve the firmness of the casting after casting;

[0027] 3. In the present invention, the adapter interfaces connected to the two jacks are arranged on the outer end wall of the second mold base, the fine sand interfaces corresponding to the two adapter interfaces are externally connected to a fine sand supply device, the cooling water interfaces corresponding to the two adapter interfaces are externally connected to a cooling water supply device, and through the switching formed by the movement of the bearing plate, fine sand can be injected into the copper pipe for support during die-casting to improve die-casting stability, and circulating cooling water can be injected into the copper pipe after forming to accelerate the cooling speed and improve production efficiency. With the air flow interface connected to the air pump arranged between the fine sand interface and the cooling water interface, the inside of the copper pipe can be cleaned by air blowing, which to a certain extent ensures the flexible and stable switching of sand injection and water injection in the copper pipe. Description of the Drawings

[0028] The accompanying drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 is a perspective view of the rear end cover casting of the automotive power device of the present invention;

[0030] Figure 2 is a perspective view of the prefabricated part of the present invention;

[0031] Figure 3 is an exploded view of the prefabricated part of the present invention;

[0032] Figure 4 is a perspective view of the casting device for the rear end cover of the automotive power device of the present invention;

[0033] Figure 5 is an exploded view of the casting device for the rear end cover of the automotive power device of the present invention;

[0034] Figure 6 is a perspective view of the annular seat, jack and piston block of the present invention;

[0035] Figure 7 is a perspective view of the second die holder, first annular groove and second annular groove of the present invention;

[0036] Figure 8 is a front sectional view of the casting device for the rear end cover of the automotive power device of the present invention;

[0037] Figure 9 is a front view of the casting device for the rear end cover of the automotive power device of the present invention;

[0038] Figure 10 of the present invention Figure 9 is a sectional view taken along line A-A;

[0039] Figure 11 is a right view of the casting device for the rear end cover of the automotive power device of the present invention;

[0040] Figure 12 of the present invention Figure 11 is a sectional view taken along line B-B;

[0041] Figure 13 of the present invention Figure 11 is a sectional view taken along line C-C;

[0042] Figure 14 is a left view of the casting device for the rear end cover of the automotive power device of the present invention;

[0043] Figure 15 of the present invention Figure 14Cross-sectional view at D-D in the middle;

[0044] Figure 16 This is a process flow chart for producing castings by the casting device for the rear end cover of the automotive power device of the present invention.

[0045] Serial numbers in the figure:

[0046] 1. First die holder; 101. Second die holder; 102. Molding cavity; 103. Injection channel;

[0047] 2. Ring seat; 201. Socket; 202. External gear ring; 203. First gear; 204. Servo motor; 205. Second gear;

[0048] 3. Chamber; 301. Piston block; 302. Hydraulic oil interface; 303. First annular groove; 304. Hydraulic oil channel;

[0049] 4. Copper tube; 401. Pipe joint; 402. Copper sheet; 403. Positioning piece; 404. Main body of aluminum alloy casting;

[0050] 5. Adapter; 501. Second annular groove;

[0051] 6. Frame shell; 601. Bearing plate; 602. Fine sand interface; 603. Cooling water interface; 604. Air flow interface; 605. Electric push rod. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0053] Embodiment 1: This embodiment provides a casting for the rear end cover of an automotive power device. Refer to Figure 1 - Figure 3 , specifically, it includes a prefabricated part, and the prefabricated part includes a copper tube 4. Pipe joints 401 adapted to the sockets 201 are fixedly connected to both ends of the copper tube 4 respectively, and the pipe joints 401 are perpendicular to the copper tube 4. A number of circumferentially distributed copper sheets 402 are uniformly fixed on the copper tube 4. A positioning piece 403 is fixed on the pipe joint 401. The copper tube 4, the pipe joint 401, the copper sheet 402, and the positioning piece 403 are wrapped by a main body 404 of an aluminum alloy casting, and the main body 404 of the aluminum alloy casting is die-cast in the molding cavity 102. Two copper sheets 402 are arranged side by side at the same position, and the positioning pieces 403 fixed on the two copper sheets 402 are connected to each other. The outer end wall of the main body 404 of the aluminum alloy casting is flush with the outer end wall of the positioning piece 403. The copper tube 4 is integrally arranged in a spiral structure and is embedded in the middle layer position of the main body 404 of the aluminum alloy casting.

[0054] After the production of the rear end cover casting of the automotive power device is completed, it can be installed at the rear end of the housing of the automotive power device, making the housing of the motor of the automotive power device in a closed state. During actual use, the pipe connectors 401 connected to both ends of the copper pipe 4 can be exposed outside the main body 404 of the aluminum alloy casting. The two pipe connectors 401 can be connected to the cooling system in the vehicle, driving the coolant to circulate in the copper pipe 4, carrying and dissipating the heat generated by the operation of the automotive power device outward. The automotive power device equipped with this rear end cover casting has a more excellent heat dissipation effect.

[0055] During the process of machining the rear end cover casting of the automotive power device, a preform is first produced, and then the preform is placed in the molding cavity 102 in the casting device. By means of die casting, the main body 404 of the aluminum alloy casting is directly formed outside the preform in the molding cavity 102. After processing, there is no need to perform additional machining for opening cooling channels on the casting, which can effectively improve the convenience of producing the rear end cover casting of the automotive power device with cooling channels, is beneficial to reducing production costs. And compared with the prior art in which the rear end cover casting is separately cast and the cooling channels are formed in the rear end cover casting through assembly after production, during the die casting and forming process of this rear end cover casting, the copper pipe 4 is directly embedded in the main body 404 of the aluminum alloy casting, and the overall sealing effect is stronger, which is beneficial to avoiding the problem of water leakage in the cooling channels of the rear end cover casting during subsequent long-term use.

[0056] By setting the copper pipe 4 as a spiral structure in this rear end cover casting, during actual use, the coolant forms a stable spiral flow path along the copper pipe 4, which is beneficial to ensuring the uniformity and stability during the actual heat dissipation process. At the same time, by fixing a large number of copper sheets 402 around the copper pipe 4, the copper sheets 402 and the copper pipe 4 cooperate to form a mesh structure, which can not only effectively improve the efficiency of transferring the heat absorbed by the rear end cover casting to the coolant in the copper pipe 4 and enhance the overall heat dissipation effect, but also use the copper pipe 4 and the copper sheets 402 as the framework, which is beneficial to enhancing the overall firmness of the rear end cover casting.

[0057] Embodiment 2: On the basis of Embodiment 1, this embodiment further includes: A casting device for the rear end cover of an automotive power device, see Figure 4 - Figure 16, Specifically, it includes a first die holder 1 and a second die holder 101. A molding cavity 102 is provided on the mating surface of the first die holder 1 and the second die holder 101. A material injection channel 103 communicating with the molding cavity 102 is provided in the second die holder 101. An annular seat 2 is installed in the second die holder 101, and one side end wall of the annular seat 2 is located on the inner end wall of the molding cavity 102. Two jacks 201 are provided in the annular seat 2. A clamping mechanism is arranged in the annular seat 2. The clamping mechanism includes chambers 3 provided in the annular seat 2 and symmetrically located on both sides of each jack 201. The chambers 3 are arranged in a structure inclined to the outer end wall of the annular seat 2. A piston block 301 is slidably installed in the chambers 3. A hydraulic oil interface 302 is provided on the outer end wall of the second die holder 101, and the hydraulic oil interface 302 communicates with a plurality of chambers 3. A preform is preset in the molding cavity 102. Two pipe connectors 401 are respectively inserted into the two jacks 201 and are locked by the clamping mechanism.

[0058] During the operation of the device, the staff installs the device on a die casting machine and controls the relative movement of the first die holder 1 and the second die holder 101 through the die casting machine to realize the mold opening and closing operations. The hydraulic oil interface 302 is externally connected to a hydraulic oil pump, and the clamping mechanism is controlled through the suction of the hydraulic oil pump. In the mold opening state, the hydraulic oil pump starts to pump oil. Through the connection between the hydraulic oil interface 302 and the chambers 3, the piston block 301 moves toward the side away from the molding cavity 102. Since the chambers 3 are inclined in the annular seat 2, when the piston block 301 moves obliquely along the chambers 3 away from the molding cavity 102, it will synchronously move away from the corresponding jack 201. Then, the staff places the preform in the molding cavity 102 opened between the first die holder 1 and the second die holder 101, so that the pipe connectors 401 are inserted into the jacks 201. The hydraulic oil pump is started to pump oil. Under the extrusion of the hydraulic oil, the piston block 301 moves toward the molding cavity 102 and gradually approaches the corresponding jack 201, and finally firmly clamps the pipe connectors 401 in the jacks 201. An arc groove adapted to the external dimension of the pipe connector 401 is provided on the side of the piston block 301 close to the jack 201, and the side of the piston block 301 close to the molding cavity 102 is arranged in a structure adapted to the inner wall of the molding cavity 102. After the piston block 301 clamps the pipe connectors 401 in the jacks 201, the annular seat 2 and the piston block 301 form a surface adapted to the inside of the molding cavity 102. Then, the mold is closed, so that the preform is stably locked in the molding cavity 102.

[0059] After the mold is closed, the aluminum alloy melt is injected into the molding cavity 102 through the material injection channel 103 and gradually fills the molding cavity 102. Along with the pressurized injection of the aluminum alloy melt and the subsequent pressure holding operation, finally, the rear cover casting is formed in the molding cavity 102, stably wrapped on the outside of the preform, forming an integrated connection, realizing the convenient production of the rear end cover casting containing a cooling water channel inside.

[0060] In the specific implementation process, as Figure 5 , Figure 6 and Figure 8 shown, the annular seat 2 is rotatably installed in the second die base 101. An external gear ring 202 is fixedly sleeved on the outer end wall of the annular seat 2. A first gear 203 meshing with the external gear ring 202 is rotatably installed in the second die base 101. A servo motor 204 is fixedly installed on the outer end wall of the second die base 101, and a second gear 205 meshing with the first gear 203 is fixedly installed on the drive shaft of the servo motor 204. When the device operates, during the injection of the aluminum alloy melt into the forming cavity 102, the staff can start the servo motor 204 to drive the second gear 205 fixedly installed on its drive shaft to rotate. By means of the meshing of the second gear 205 and the first gear 203, and the meshing of the first gear 203 and the external gear ring 202, the annular seat 2 is driven to rotate. Since the prefabricated part is connected to the annular seat 2 through the locking of the pipe joint 401 by the clamping mechanism, when the annular seat 2 rotates, it will drive the prefabricated part to rotate in the forming cavity 102. The copper pipe 4 drives the copper sheet 402 to rotate and stir in the forming cavity 102, which can stir the injected aluminum alloy melt, not only accelerating the flow uniformity of the aluminum alloy melt, but also accelerating the rapid discharge of bubbles in the aluminum alloy melt, which is beneficial to improving the die-casting forming effect of the rear end cover casting in the forming cavity 102.

[0061] In the specific implementation process, as Figure 8 and Figure 15 shown, a first annular groove 303 surrounding the outside of the annular seat 2 is opened in the second die base 101, and the first annular groove 303 is directly communicated with the hydraulic oil interface 302. A hydraulic oil passage 304 directly communicated with a plurality of chambers 3 is opened on the outer end wall of the annular seat 2, and the hydraulic oil passage 304 is rotationally communicated with the first annular groove 303. During the operation of the device, when hydraulic oil is injected into the chambers 3 through a hydraulic oil pump to enable the clamping mechanism, the hydraulic oil enters the surrounding first annular groove 303 through the hydraulic oil interface 302, and then enters the plurality of chambers 3 through the rotational communication of the first annular groove 303 and the hydraulic oil passage 304, driving the piston block 301 to move. By means of the rotational communication of the first annular groove 303 and the plurality of hydraulic oil passages 304, the flow of the hydraulic oil can still be kept stable during the rotation of the annular seat 2, which is beneficial to ensuring the operation stability of the device.

[0062] In the specific implementation process, as Figure 5 , Figure 8 and Figure 12 - Figure 13As shown in the figure, two adapters 5 are provided on the outer end wall of the second die holder 101. Two second annular grooves 501 are formed in the second die holder 101 and are arranged around the outside of the annular seat 2. The two adapters 5 are directly communicated with the two second annular grooves 501 respectively. The two jacks 201 are rotationally communicated with the two second annular grooves 501 respectively. A frame housing 6 is fixedly installed on the outer end wall of the second die holder 101, and two bearing plates 601 are arranged in the frame housing 6. A fine sand interface 602 is fixed on each bearing plate 601. The two fine sand interfaces 602 are arranged corresponding to the two adapters 5 respectively. The two fine sand interfaces 602 are externally connected to the sand outlet and the sand return port of the fine sand supply device respectively.

[0063] During the operation of the device, in order to avoid the depression and deformation of the copper pipe 4 caused by excessive pressure during die casting, the staff can connect the copper pipe 4 with an external fine sand supply device through the two adapters 5. When the external fine sand supply device is started after the mold is closed and before the aluminum alloy melt is injected, the sand outlet of the external fine sand supply device provides fine sand. Through the connection of a fine sand interface 602 and an adapter 5, it enters into a jack 201, and then enters into the copper pipe 4 through a pipe joint 401. The filled fine sand enters into another jack 201 through another pipe joint 401. With the connection of another adapter 5 and another fine sand interface 602, it flows back to the fine sand supply device from the sand return port again. After the fine sand fills the copper pipe 4, the sand outlet and the sand return port are closed, so that the fine sand is stably maintained in the copper pipe 4 and the pipe joint 401, and supports the whole prefabricated part from the inside, which can effectively avoid the situation that the copper pipe 4 is depressed and deformed due to excessive pressure during die casting, and is beneficial to improving the stability of die casting production of the rear end cover casting.

[0064] In the specific implementation process, such as Figure 4 , Figure 5 , Figure 8 and Figure 11 - Figure 13 As shown in the figure, a cooling water interface 603 is fixed on each bearing plate 601. The two cooling water interfaces 603 are arranged corresponding to the two adapters 5 respectively. The two cooling water interfaces 603 are externally connected to the water outlet and the water return port of the cooling water supply device respectively. The two bearing plates 601 are slidably installed in the frame housing 6. Two electric push rods 605 are fixedly installed on the frame housing 6. The telescopic ends of the two electric push rods 605 are fixedly connected to the two bearing plates 601 respectively.

[0065] During the operation of the device, after die-casting molding, in order to improve the cooling and demolding efficiency of the rear cover casting, the staff can start the electric push rod 605 for control. By means of the movement of the bearing plate 601, the connection state between the adapter 5 and the fine sand interface 602 and the cooling water interface 603 is changed. Through adjustment, the staff can drive the two adapters 5 to communicate with the two cooling water interfaces 603. In this state, after the external cooling water supply device is started, cooling water can be cyclically supplied into the copper tube 4 through the connection of the fine sand interface 602 and the adapter 5. By means of the circulating flow of the cooling water, the cooling efficiency of the rear end cover casting after molding is greatly improved, facilitating the achievement of demolding conditions more quickly and being beneficial to improving production efficiency.

[0066] By arranging two second annular grooves 501 around the second mold base 101 and sleeving the second annular grooves 501 outside the annular seat 2, with the rotational connection between the two second annular grooves 501 and the two jacks 201, and the direct connection between the two adapters 5 and the two second annular grooves 501, the rotation of the annular seat 2 will not affect the passages between the adapter 5, the second annular groove 501, the jack 201, the copper tube 4 and the copper tube 4, which is beneficial to ensuring the operation stability of the device.

[0067] In the specific implementation process, as Figure 11 - Figure 13 shown, the fine sand interface 602 connected to the sand outlet and the cooling water interface 603 connected to the water outlet are located on the same bearing plate 601. An air flow interface 604 corresponding to the adapter 5 is installed on the bearing plate 601, and the air flow interface 604 is externally connected to an air pump. The air flow interface 604 is arranged between the fine sand interface 602 and the cooling water interface 603. During the operation of the device, since fine sand needs to be filled into the copper tube 4 before die-casting and cooling water needs to be filled into the copper tube 4 after die-casting, in order to avoid interference between the fine sand and the cooling water, the staff can control the movement of the bearing plate 601 through the electric push rod 605. Before switching the filling of fine sand and cooling water, the air flow interface 604 is first switched to a state of communicating with one adapter 5. If there is fine sand in the copper tube 4, the other adapter 5 remains in a state of communicating with the sand return port of the fine sand supply device. If there is cooling water in the copper tube 4, the other adapter 5 remains in a state of communicating with the cooling water return port. By starting the air pump externally connected to the air flow interface 604, high-pressure air is injected into the copper tube 4 to blow out the previously remaining fine sand or cooling water in the copper tube 4 into the corresponding device, which can effectively reduce the probability of interference between the fine sand and the cooling water in the copper tube 4. Moreover, by arranging the air flow interface 604 between the fine sand interface 602 and the cooling water interface 603, both the fine sand and the cooling water will be cleaned by air blowing before switching, making the operation more convenient and efficient.

[0068] Specifically, the working principle and operation method of the present invention are as follows:

[0069] In the mold-open state, insert the pipe joint 401 into the jack 201, and then drive the pair of piston blocks 301 arranged in the clamping mechanism to approach each other, firmly clamp the pipe joint 401 in the jack 201. After the mold is closed, the copper pipe 4 is at the middle layer position in the molding cavity 102. By moving the telescopic ends of the two electric push rods 605, control the corresponding connection of the two fine sand interfaces 602 and the two adapter interfaces 5. Through an external fine sand supply device, inject fine sand into the copper pipe 4 for support. The aluminum alloy melt is injected into the molding cavity 102 through the injection channel 103. During the injection process of the aluminum alloy melt, the servo motor 204 is started. With the meshing transmission of the second gear 205, the first gear 203 and the external gear ring 202, drive the annular seat 2 to drive the preform to slowly rotate in the molding cavity 102. When the molding cavity 102 is about to be filled, stop the rotation drive of the preform, and keep the preform at the pre-set position. Inject the aluminum alloy melt into the molding cavity 102 under pressure through the injection channel 103 until the molding cavity 102 is filled, and perform a pressure-holding operation on the molding cavity 102, waiting for the casting to cool and solidify. Drive the corresponding bearing plate 601 to move through the electric push rod 605, control the connection of the air flow interface 604 with an adapter interface 5, and the fine sand interface 602 connected to the sand return port of the fine sand supply device still maintains the connection state with the corresponding adapter interface 5. Through the air pump connected to the air flow interface 604, blow the fine sand in the copper pipe 4 into the fine sand supply device. Drive the corresponding bearing plate 601 to move through the electric push rod 605, so that the two cooling water interfaces 603 and the two adapter interfaces 5 are correspondingly connected. Through an external cooling water supply device, circulate and inject cooling water into the copper pipe 4 to actively cool the formed casting. When the casting reaches the condition for mold opening and material taking, drive the corresponding bearing plate 601 to move through the electric push rod 605, so that the air flow interface 604 is reconnected to an adapter interface 5, and the cooling water interface 603 connected to the water return port of the cooling water supply device still maintains the connection state with the corresponding adapter interface 5. Through the air pump connected to the air flow interface 604, blow the cooling water in the copper pipe 4 into the cooling water supply device, and then open the mold, release the locking of the clamping mechanism, and complete the demolding and material taking of the casting.

[0070] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A casting device for a rear end cover of an automobile power unit, comprising a first die base (1) and a second die base (101), characterized in that: A molding cavity (102) is provided on the connecting surfaces of the first mold base (1) and the second mold base (101); an injection channel (103) communicating with the molding cavity (102) is provided in the second mold base (101); an annular seat (2) is installed in the second mold base (101), and one end wall of the annular seat (2) is located on the inner end wall of the molding cavity (102); the annular seat (2) is rotatably installed in the second mold base (101); two insertion holes (201) are provided in the annular seat (2); a clamping mechanism is provided in the annular seat (2); the clamping mechanism comprises chambers (3) provided in the annular seat (2) and symmetrically located on both sides of each insertion hole (201); ), the chamber (3) is provided with a structure inclined with respect to the outer end wall of the annular seat (2), a piston block (301) is slidably mounted in the chamber (3), a hydraulic oil interface (302) is provided on the outer end wall of the second mold base (101), and the hydraulic oil interface (302) is in communication with a plurality of chambers (3), a preform is preset in the molding cavity (102), and the preform comprises a copper tube (4), both ends of the copper tube (4) are respectively fixedly connected with pipe joints (401) adapted to the jack (201), and the pipe joints (401) are arranged perpendicular to the copper tube (4), and two pipe joints (401) are respectively inserted into two jacks (201) and locked by a clamping mechanism; Two transfer ports (5) are arranged on the outer end wall of the second mold base (101), and the two transfer ports (5) are respectively connected to the two jacks (201); a frame shell (6) is fixedly mounted on the outer end wall of the second mold base (101), and two bearing plates (601) are arranged in the frame shell (6); a fine sand port (602) is fixed on each of the bearing plates (601), and the two fine sand ports (602) are respectively arranged corresponding to the two transfer ports (5); the two fine sand ports (602) are respectively connected to a sand outlet and a sand return port of a fine sand supply device; a cooling water port (603) is fixed on each of the bearing plates (601), and the two cooling water ports (603) are respectively arranged corresponding to the two transfer ports (5); the two cooling water ports (603) are respectively connected to a water outlet and a water return port of a cooling water supply device; and the two bearing plates (601) are slidably mounted in the frame shell (6).

2. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: An outer gear ring (202) is fixedly sleeved on the outer end wall of the annular seat (2), a first gear (203) meshing with the outer gear ring (202) is rotatably mounted inside the second die seat (101), a servo motor (204) is fixedly mounted on the outer end wall of the second die seat (101), and a second gear (205) meshing with the first gear (203) is fixedly mounted on the drive shaft of the servo motor (204).

3. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: A plurality of copper sheets (402) distributed around the copper tube (4) are evenly fixed on the copper tube (4), and a positioning sheet (403) is fixed on the pipe joint (401).

4. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: The second die base (101) is provided with a first annular groove (303) arranged around the outside of the annular base (2), and the first annular groove (303) is directly connected to the hydraulic oil interface (302). The outer end wall of the annular base (2) is provided with a hydraulic oil passage (304) directly connected to the plurality of chambers (3), and the hydraulic oil passage (304) is rotatably connected to the first annular groove (303). The second die base (101) is provided with two second annular grooves (501) arranged around the outside of the annular base (2), the two transfer interfaces (5) are directly connected to the two second annular grooves (501) respectively, and the two insertion holes (201) are rotatably connected to the two second annular grooves (501) respectively.

5. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: Two electric push rods (605) are fixedly mounted on the frame shell (6), and telescopic ends of the two electric push rods (605) are respectively fixedly connected to two bearing plates (601).

6. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: The fine sand interface (602) connected to the sand outlet and the cooling water interface (603) connected to the water outlet are located on the same carrier plate (601); an airflow interface (604) corresponding to the transfer interface (5) is installed on the carrier plate (601); the airflow interface (604) is externally connected to an air pump; the airflow interface (604) is arranged between the fine sand interface (602) and the cooling water interface (603).

7. A casting produced by the casting device for the rear end cover of an automobile power unit according to any one of claims 1 to 6, characterized in that: The outer sides of the copper tube (4), the pipe joint (401), the copper sheet (402) and the positioning sheet (403) are wrapped with an aluminum alloy casting body (404), and the aluminum alloy casting body (404) is die-cast in the molding cavity (102), the two copper sheets (402) are arranged side by side at the same position, the positioning sheets (403) fixed on the two copper sheets (402) are connected to each other, and the outer end wall of the aluminum alloy casting body (404) is flush with the outer end wall of the positioning sheet (403).

8. The casting produced by the casting device for the rear end cover of an automobile power unit according to claim 7 is characterized in that: The copper tube (4) is configured as a spiral structure as a whole, and the copper tube (4) is embedded in the middle layer of the aluminum alloy casting body (404).

9. A method for producing a casting according to the casting device for the rear end cover of an automobile power unit according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Installation of the preform: in the mold open state, the pipe joint (401) is inserted into the insertion hole (201), and then the piston blocks (301) arranged in pairs in the clamping mechanism are driven to approach each other, so that the pipe joint (401) is firmly clamped in the insertion hole (201), and after the mold is closed, the copper tube (4) is located in the middle layer position in the molding cavity (102); S2, injecting sand for internal support, by moving the telescopic ends of the two electric push rods (605), controlling the two fine sand interfaces (602) and the two transfer interfaces (5) to be connected to each other, and injecting fine sand into the copper tube (4) for support through an external fine sand supply device; S3, stirring during the casting process, the aluminum alloy melt is injected into the molding cavity (102) through the injection channel (103), and during the injection process of the aluminum alloy melt, the servo motor (204) is started, and the ring seat (2) is driven to drive the preform to rotate slowly in the molding cavity (102) by means of the meshing transmission of the second gear (205), the first gear (203) and the outer gear ring (202). When the molding cavity (102) is about to be filled, the rotation drive of the preform is stopped, and the preform is stopped at a preset position; S4, die casting, injecting aluminum alloy melt into the molding cavity (102) under pressure through the injection channel (103) until the molding cavity (102) is filled, and maintaining pressure in the molding cavity (102) to wait for the casting to cool and set; S5, blowing away the sand, driving the corresponding carrying plate (601) to move by means of an electric push rod (605), controlling the airflow interface (604) to be connected to an adapter (5), while the fine sand interface (602) connected to the sand return port of the fine sand supply device remains connected to the corresponding adapter (5), and the fine sand in the copper tube (4) is blown into the fine sand supply device by means of an air pump externally connected to the airflow interface (604); S6, injecting water for cooling, driving the corresponding bearing plate (601) to move by means of an electric push rod (605), so that the two cooling water interfaces (603) and the two transfer interfaces (5) are connected to each other, and injecting cooling water into the copper tube (4) through an external cooling water supply device, so as to actively cool the formed casting; S7, blowing water to open the mold and take out the material. When the casting reaches the conditions for opening the mold and taking out the material, the electric push rod (605) drives the corresponding support plate (601) to move, so that the air flow interface (604) is re-connected with an adapter (5), while the cooling water interface (603) connected to the return water port of the cooling water supply device remains connected to the corresponding adapter (5). The cooling water in the copper tube (4) is blown into the cooling water supply device through an air pump externally connected to the air flow interface (604), and then the mold is opened, the clamping mechanism is unlocked, and the casting is demoulded and taken out.

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