Automobile power device rear end cover casting and manufacturing method

Abstract

The invention discloses an automobile power device rear end cover casting and a manufacturing method, and relates to the technical field of metal die-casting, a prefabricated part is pre-installed in a forming cavity through a clamping mechanism, so that after die-casting production, an aluminum alloy casting main body formed by curing an aluminum alloy melt directly wraps the outer side of a copper pipe, and by means of the existence of the copper pipe, the aluminum alloy casting main body is formed. Cooling liquid can be introduced into the die-cast rear end cover casting, the heat dissipation efficiency of a power device in the follow-up using process is improved, the cooling water channel is directly formed in the rear cover plate casting in the die-casting process, the production efficiency of the cooling water cover is greatly improved, the overall sealing performance of the cooling water channel can be effectively improved, and the service life of the cooling water channel is prolonged. The probability of leakage of the cooling water channel in the using process of the rear end cover casting is greatly reduced, the product quality is improved to a certain degree, and the production cost is effectively reduced.

Description

Technical Field

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

[0002] In the field of automobile manufacturing, the performance of the power unit directly determines the overall operating performance of the car. As a key component of the power unit, the quality and performance of the rear end cover are crucial. The rear end cover must not only withstand complex mechanical stresses, but also have good heat dissipation performance to ensure that the power unit can operate stably under long-term, high-intensity working conditions.

[0003] When producing the rear end cover casting of the automobile power unit in the prior art, it is usually difficult to directly form a cooling water channel in the rear end cover casting. For the molding processing of the cooling water channel, later drilling, milling, or split casting is mostly adopted, which makes the production process complicated and the processing cost is high. In addition, for the cooling water channel formed by the split casting combination, a large number of seals are required for the connection parts after splicing. Not only are the assembly steps cumbersome, but the sealing of the connection parts is also difficult to ensure. In the long-term high-temperature working environment of the power unit, the connection is prone to leakage, resulting in coolant leakage, causing serious consequences.

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

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that it is difficult to directly form cooling water channels in the rear end cover casting of an automobile power unit, which affects the processing cost and the stability of use of the rear end cover casting, and to propose a rear end cover casting for an automobile power unit and a manufacturing method.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions: A casting device for a rear end cover of an automobile power unit comprises a first die base and a second die base, a molding cavity is provided on the connecting surfaces of the first die base and the second die base, an injection channel connected to the molding 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 located on the inner end wall of the molding cavity, two insertion holes are provided in the annular seat, a clamping mechanism is provided in the annular seat, the clamping mechanism comprises a chamber provided in the annular seat and symmetrically located on both sides of each insertion hole, a structure is provided in the chamber that is inclined to the outer end wall of the annular seat, a piston block is slidably installed in the chamber, a hydraulic oil interface is provided on the outer end wall of the second die base, and the hydraulic oil interface is connected to a plurality of chambers, a prefabricated part is preset in the molding cavity, and the prefabricated part comprises a copper tube, both ends of the copper tube are respectively fixedly connected with pipe joints adapted to the insertion holes, and the pipe joints are vertically arranged to the copper tube, and the two pipe joints are respectively inserted into the two insertion holes and locked by the clamping mechanism.

[0007] Preferably, the annular seat is rotatably installed in the second mold base, an outer gear ring is fixedly sleeved on the outer end wall of the annular seat, a first gear meshing with the outer gear ring is rotatably installed in the second mold base, a servo motor is fixedly installed on the outer end wall of the second mold base, and a second gear meshing with the first gear is fixedly installed on the drive shaft of the servo motor.

[0008] Preferably, a plurality of surrounding copper sheets are evenly fixed on the copper tube, and a positioning sheet is fixed on the tube joint.

[0009] Preferably, a first annular groove is provided in the second die base and is arranged around the outer side of the annular seat, and the first annular groove is directly connected to the hydraulic oil interface, a hydraulic oil channel directly connected to the plurality of chambers is provided on the outer end wall of the annular seat, and the hydraulic oil channel is rotatably connected to the first annular groove, two adapters are provided on the outer end wall of the second die base, and two second annular grooves are provided in the second die base and are arranged around the outer side of the annular seat, the two adapters are directly connected to the two second annular grooves respectively, and the two sockets are rotatably connected to the two second annular grooves respectively.

[0010] Preferably, a frame shell is fixedly installed on the outer end wall of the second mold base, and two supporting plates are arranged in the frame shell, each supporting plate is fixed with a fine sand interface, the two fine sand interfaces are respectively arranged corresponding to the two transfer interfaces, and the two fine sand interfaces are respectively connected to the sand outlet and sand return outlet of the fine sand supply device.

[0011] Preferably, each supporting plate is fixed with a cooling water interface, and the two cooling water interfaces are respectively arranged corresponding to the two adapters, and the two cooling water interfaces are respectively connected to the water outlet and return outlet of the cooling water supply device. The two supporting plates are slidably installed in the frame shell, and two electric push rods are fixedly installed on the frame shell, and the telescopic ends of the two electric push rods are respectively fixedly connected to the two supporting plates.

[0012] 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 supporting plate, an airflow interface corresponding to the transfer interface is installed on the supporting plate, and the airflow interface is externally connected to an air pump, and the airflow interface is arranged between the fine sand interface and the cooling water interface.

[0013] Preferably, a casting produced by a casting device for the rear end cover of an automobile power unit, the outer sides of the copper tube, the pipe joint, the copper sheet and the positioning sheet are wrapped with an aluminum alloy casting body, and the aluminum alloy casting body is die-cast in a molding cavity, the two copper sheets are side by side in the same position, the positioning sheets fixed on the two copper sheets are connected to each other, and the outer end wall of the aluminum alloy casting body is flush with the outer end wall of the positioning sheet.

[0014] Preferably, the copper tube is configured as a spiral structure as a whole, and the copper tube is embedded in the middle layer of the main body of the aluminum alloy casting.

[0015] Preferably, a method for producing a casting by a rear end cover casting device of an automobile power unit comprises the following steps: S1. Installation of preforms: In the state of mold opening, insert the pipe joint into the jack, and then drive the piston blocks arranged in pairs in the clamping mechanism to approach each other, firmly clamp the pipe joint in the jack, and after mold closing, the copper tube is in the middle layer position in the molding cavity; S2, injecting 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 transfer interfaces, and inject fine sand into the copper tube for support through the external fine sand supply device; S3, stirring during the casting process, 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, and the ring seat is driven to drive the preform to rotate slowly in the molding cavity by means of the meshing transmission of the second gear, the first gear and the outer gear ring. When the molding cavity 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, pressurizing and injecting aluminum alloy melt into the molding cavity through the injection channel until the molding cavity is filled, and maintaining pressure in the molding cavity, waiting for the casting to cool and set; S5, blowing away the sand, the electric push rod drives the corresponding carrying plate to move, controls the airflow interface to be connected with a transfer interface, and the fine sand interface connected with the sand return port of the fine sand supply device remains connected with the corresponding transfer interface, and the air pump connected to the airflow interface is used to blow the fine sand in the copper tube into the fine sand supply device; S6, water injection for cooling, the corresponding bearing plate is driven to move by the electric push rod, so that the two cooling water interfaces and the two adapters are connected to each other, and cooling water is circulated and injected into the copper tube through the external cooling water supply device 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 is used to drive the corresponding carrier plate to move, so that the airflow interface is re-connected with a transfer interface, and the cooling water interface connected to the return water port of the cooling water supply device remains connected to the corresponding transfer interface. The cooling water in the copper tube is blown into the cooling water supply device through an air pump externally connected to the airflow interface, and then the mold is opened, the clamping mechanism is unlocked, and the demolding and material taking of the casting is completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the preform is pre-installed in the molding cavity by a clamping mechanism, so that after the die-casting production, the aluminum alloy casting body formed by the solidification of the aluminum alloy melt is directly wrapped on the outside of the copper tube. With the existence of the copper tube, the coolant can be introduced into the die-cast rear end cover casting, which is beneficial to improve the heat dissipation efficiency of the power device during subsequent use. In addition, since the cooling water channel is directly formed in the rear cover casting during the die-casting process, the production efficiency of the cooling water cover is greatly improved, and the overall sealing of the cooling water channel can be effectively improved, which greatly reduces the probability of cooling water channel leakage during the use of the rear end cover casting; 2. In the present invention, by rotatably installing the annular seat in the second die seat and connecting the preform with the annular seat through a clamping mechanism, the preform can be driven to rotate in the molding cavity during the injection of the aluminum alloy melt, and the stirring disturbance effect can be increased by the copper sheet, which can not only make the injection of the aluminum alloy melt more uniform, but also speed up the efficiency of the bubbles in the aluminum alloy melt to be led out, which is beneficial to improving the die casting effect. At the same time, the presence of the copper sheet cooperates with the copper tube to form a mesh structure, which can effectively improve the firmness of the casting after the casting is completed; 3. In the present invention, by arranging an adapter connected with the two jacks on the outer end wall of the second die base, and connecting the fine sand interface corresponding to the two adapters to an external fine sand supply device, and connecting the cooling water interface corresponding to the two adapters to an external cooling water supply device, in conjunction with the switching formed by the movement of the carrying plate, fine sand can be injected into the copper tube for support during die-casting to improve the die-casting stability, and circulating cooling water can be injected into the copper tube after molding to accelerate the cooling rate and improve production efficiency, and an airflow interface connected to an air pump is provided between the fine sand interface and the cooling water interface, so that the inside of the copper tube can be cleaned by air blowing, which ensures the flexibility and stability of the switching between sand injection and water injection in the copper tube to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary 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: Figure 1 A three-dimensional diagram of a rear end cover casting of an automobile power unit of the present invention; Figure 2 is a three-dimensional diagram of the preform of the present invention; Figure 3 This is a disassembled diagram of the prefabricated part of the present invention; Figure 4 A three-dimensional diagram of a casting device for a rear end cover of an automobile power device according to the present invention; Figure 5 This is a disassembled view of the rear end cover casting device of the automobile power device of the present invention; Figure 6 A three-dimensional diagram of the annular seat, the jack and the piston block of the present invention; Figure 7 A three-dimensional diagram of the second die base, the first annular groove and the second annular groove of the present invention; Figure 8 It is a front cross-sectional view of a casting device for a rear end cover of an automobile power device of the present invention; Fig. 9 It is a front view of the casting device of the rear end cover of the automobile power device of the present invention; Fig.10 For the present invention Fig. 9 Sectional view at AA in the middle; Fig.11 It is a right side view of the casting device of the rear end cover of the automobile power device of the present invention; Fig.12 For the present invention Fig.11 Sectional view at the middle BB; Fig.13 For the present invention Fig.11 Sectional view at CC; Fig.14 It is a left side view of the casting device of the rear end cover of the automobile power device of the present invention; Fig.15 For the present invention Fig.14 Sectional view at DD in the middle; Fig.16 The present invention is a flow chart of a method for producing castings by a casting device for a rear end cover of an automobile power unit.

[0018] Serial number in the picture: 1. First die base; 101. Second die base; 102. Forming cavity; 103. Injection channel; 2. annular seat; 201. jack; 202. outer gear ring; 203. first gear; 204. servo motor; 205. second gear; 3. Chamber; 301. Piston block; 302. Hydraulic oil interface; 303. First ring groove; 304. Hydraulic oil channel; 4. Copper tube; 401. Pipe joint; 402. Copper sheet; 403. Positioning sheet; 404. Aluminum alloy casting body; 5. Adapter; 501. Second ring groove; 6. Frame; 601. Loading plate; 602. Fine sand interface; 603. Cooling water interface; 604. Air flow interface; 605. Electric push rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment 1: This embodiment provides a rear end cover casting of an automobile power device, see Figure 1 - Figure 3 Specifically, it includes a prefabricated part, and the prefabricated part includes a copper tube 4, both ends of the copper tube 4 are respectively fixedly connected with a pipe joint 401 adapted to the socket 201, and the pipe joint 401 is vertically arranged with the copper tube 4, a plurality of surrounding copper sheets 402 are evenly fixed on the copper tube 4, a positioning sheet 403 is fixed on the pipe joint 401, and 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 in the same position, the positioning sheets 403 fixed on the two copper sheets 402 are connected to each other, the outer end wall of the aluminum alloy casting body 404 is flush with the outer end wall of the positioning sheet 403, the copper tube 4 is arranged as a spiral structure as a whole, and the copper tube 4 is embedded in the middle layer position of the aluminum alloy casting body 404.

[0021] After the rear end cover casting of the automobile power unit is produced, it can be installed at the rear end of the automobile power unit shell, so that the shell of the automobile power unit motor is in a closed state. During actual use, the pipe joints 401 connected at both ends of the copper tube 4 are exposed on the outside of the aluminum alloy casting body 404. The two pipe joints 401 can be connected to the cooling system in the automobile, driving the coolant to circulate in the copper tube 4, and carrying the heat generated by the automobile power unit to the outside to dissipate. The automobile power unit equipped with the rear end cover casting has a better heat dissipation effect.

[0022] During the processing of the rear end cover casting of the automobile power unit, a preform is first produced, and then the preform is placed in the molding cavity 102 in the casting device. The aluminum alloy casting body 404 is directly formed on the outside of the preform in the molding cavity 102 by die casting, so that after the processing is completed, there is no need to perform additional cooling water channel opening processing on the casting, which can effectively improve the convenience of production of the rear end cover casting of the automobile power unit containing the cooling water channel, which is beneficial to reducing production costs. Compared with the processing method in the prior art that the rear end cover casting is cast in separate parts and the cooling water channel can be formed in the rear end cover casting only through assembly after production, the rear end cover casting directly embeds the copper tube 4 into the aluminum alloy casting body 404 during the die casting process, and the overall sealing effect is stronger, which is beneficial to avoid the problem of cooling water channel leakage of the rear end cover casting during subsequent long-term use.

[0023] The rear end cover casting is configured with a spiral structure for the copper tube 4, so that during actual use, the coolant forms a stable spiral flow path along the copper tube 4, which is beneficial to ensuring uniform stability during the actual heat dissipation process. At the same time, by surrounding and fixing a plurality of copper sheets 402 on the copper tube 4, the copper sheets 402 cooperate with the copper tube 4 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 tube 4 and improve the overall heat dissipation effect, but also the copper tube 4 and the copper sheets 402 can be used as a skeleton, which is beneficial to improving the overall firmness of the rear end cover casting.

[0024] Embodiment 2: Based on Embodiment 1, this embodiment further includes: a casting device for the rear end cover of an automobile power unit, see Figure 4 - Fig.16 Specifically, it includes a first mold base 1 and a second mold base 101, a molding cavity 102 is provided on the connecting surface of the first mold base 1 and the second mold base 101, an injection channel 103 connected 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 side end wall of the annular seat 2 is on the inner end wall of the molding cavity 102, two plug holes 201 are provided in the annular seat 2, and a clamping mechanism is provided in the annular seat 2, the clamping mechanism includes a chamber 3 provided in the annular seat 2 and symmetrically located on both sides of each plug hole 201, the chamber 3 is provided with a structure inclined to the outer end wall of the annular seat 2, a piston block 301 is slidably installed 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 connected with many chambers 3, a prefabricated part is preset in the molding cavity 102, and two pipe joints 401 are respectively inserted into the two plug holes 201 and locked by the clamping mechanism.

[0025] During the operation of the device, the staff installs the device on the die-casting machine, controls the relative movement of the first die base 1 and the second die base 101 through the die-casting machine, and realizes the mold opening and closing operation. The hydraulic oil interface 302 is externally connected to the hydraulic oil pump, and the clamping mechanism is controlled by the suction of the hydraulic oil pump. In the mold opening state, the hydraulic oil pump starts to pump oil, and the piston block 301 moves to the side away from the molding cavity 102 through the connection between the hydraulic oil interface 302 and the chamber 3. Since the chamber 3 is tilted and opened in the annular seat 2, the piston block 301 moves away from the corresponding socket 201 when it moves along the cavity 3 away from the molding cavity 102. Then, the staff places the preform in the molding cavity 10 opened between the first die base 1 and the second die base 101. 2, so that the pipe joint 401 is plugged into the socket 201, and the hydraulic oil pump is started to pump oil. Under the push of the hydraulic oil, the piston block 301 moves toward the molding cavity 102 and gradually approaches the corresponding socket 201, and finally the pipe joint 401 is firmly clamped in the socket 201. An arc groove matching the external size of the pipe joint 401 is provided on the side of the piston block 301 close to the socket 201, and a side of the piston block 301 close to the molding cavity 102 is set as a structure matching the inner wall of the molding cavity 102. When the piston block 301 clamps the pipe joint 401 in the socket 201, the annular seat 2 cooperates with the piston block 301 to form a surface matching the molding cavity 102, and then the mold is closed, so that the preform is stably locked in the molding cavity 102.

[0026] After the mold is closed, the molten aluminum alloy is injected into the molding cavity 102 through the injection channel 103 and gradually fills the molding cavity 102. Accompanied by the pressurized injection of the molten aluminum alloy and the subsequent pressure holding operation, the rear cover plate casting is finally formed in the molding cavity 102 and stably wrapped around the outside of the preform to form an integrated connection, thereby realizing the convenient production of the rear cover casting containing cooling water channels inside.

[0027] In the specific implementation process, Figure 5 , Figure 6 and Figure 8As shown, the annular seat 2 is rotatably mounted in the second die base 101, 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 in the second die base 101, a servo motor 204 is fixedly mounted on the outer end wall of the second die base 101, and a second gear 205 meshing with the first gear 203 is fixedly mounted on the drive shaft of the servo motor 204. When the device is running, during the process of injecting aluminum alloy melt into the molding cavity 102, the staff can start the servo motor 204 to drive the second gear 205 fixedly mounted on its drive shaft to rotate, and with the help of the second gear The meshing of 205 and the first gear 203, as well as the meshing of the first gear 203 and the outer gear ring 202, drive the annular seat 2 to rotate. Since the preform locks the pipe joint 401 through the clamping mechanism and is connected to the annular seat 2, the annular seat 2 will drive the preform to rotate in the molding cavity 102 during its rotation. The copper sheet 402 is driven by the copper tube 4 to rotate and disturb in the molding cavity 102, which can stir the injected aluminum alloy melt, which can not only speed up the flow uniformity of the aluminum alloy melt, but also speed up the rapid discharge of bubbles in the aluminum alloy melt, which is beneficial to improving the die-casting effect of the rear end cover casting in the molding cavity 102.

[0028] In the specific implementation process, Figure 8 and Fig.15 As shown, a first annular groove 303 is provided in the second mold base 101 and is arranged around the outer side of the annular base 2, and the first annular groove 303 is directly connected to the hydraulic oil interface 302. A hydraulic oil channel 304 is provided on the outer end wall of the annular base 2 and is directly connected to the plurality of chambers 3, and the hydraulic oil channel 304 is rotationally connected to the first annular groove 303. During the operation of the device, when hydraulic oil is injected into the chamber 3 by the hydraulic oil pump to activate the clamping mechanism, the hydraulic oil enters the first annular groove 303 through the hydraulic oil interface 302, and then enters the plurality of chambers 3 through the rotational connection between the first annular groove 303 and the hydraulic oil channel 304, driving the piston block 301 to move. With the help of the rotational connection between the first annular groove 303 and the plurality of hydraulic oil channels 304, the flow of the hydraulic oil can remain stable during the rotation of the annular base 2, which is beneficial to ensuring the operating stability of the device.

[0029] In the specific implementation process, Figure 5 , Figure 8 and Fig.12 - Fig.13As shown, two transfer interfaces 5 are provided on the outer end wall of the second mold base 101, and two second annular grooves 501 are provided in the second mold base 101, which are surrounded by the outer side of the annular base 2. The two transfer interfaces 5 are directly connected with the two second annular grooves 501 respectively, and the two jacks 201 are rotatably connected with the two second annular grooves 501 respectively. A frame shell 6 is fixedly installed on the outer end wall of the second mold base 101, and two bearing plates 601 are provided in the frame shell 6, and a fine sand interface 602 is fixed on each bearing plate 601. The two fine sand interfaces 602 are respectively arranged corresponding to the two transfer interfaces 5, and the two fine sand interfaces 602 are respectively connected to the sand outlet and the sand return outlet of the fine sand supply device.

[0030] During the operation of the device, in order to avoid the copper tube 4 from being sunken due to excessive pressure during the die-casting process, the staff can connect the copper tube 4 with the external fine sand supply device through the two adapters 5. When the aluminum alloy melt is not injected after the mold is closed, the external fine sand supply device is started, and its sand outlet provides fine sand, which enters a socket 201 through the connection of a fine sand interface 602 and an adapter 5, and then enters the copper tube 4 through a pipe joint 401. The filled fine sand enters another socket 201 through another pipe joint 401, and with the help of the connection between another adapter 5 and another fine sand interface 602, it flows back to the fine sand supply device from the sand return port. When the fine sand is filled in the copper tube 4, the sand outlet and the sand return port are closed, so that the fine sand is stably maintained in the copper tube 4 and the pipe joint 401, and the entire prefabricated part is supported from the inside, which can effectively avoid the situation where the copper tube 4 is sunken and deformed due to excessive pressure during the die-casting process, which is beneficial to improving the stability of the die-casting production of the rear end cover casting.

[0031] In the specific implementation process, Figure 4 , Figure 5 , Figure 8 and Fig.11 - Fig.13 As shown, each supporting plate 601 is fixed with a cooling water interface 603, and the two cooling water interfaces 603 are respectively arranged corresponding to the two adapters 5. The two cooling water interfaces 603 are respectively connected to the water outlet and the water return port of the cooling water supply device. The two supporting plates 601 are both slidably installed in the frame shell 6, and two electric push rods 605 are fixedly installed on the frame shell 6. The telescopic ends of the two electric push rods 605 are respectively fixedly connected to the two supporting plates 601.

[0032] During the operation of the device, after die-casting, in order to improve the efficiency of cooling and demolding of the rear cover casting, the staff can start the electric push rod 605 for control, and change the connection state of the adapter 5 with the fine sand interface 602 and the cooling water interface 603 by moving the supporting plate 601. Through adjustment, the staff can drive the two adapters 5 to connect with the two cooling water interfaces 603. In this state, after the external cooling water supply device is started, cooling water can be circulated to the copper tube 4 through the connection between the fine sand interface 602 and the adapter 5. With the help of the circulating flow of cooling water, the efficiency of cooling the rear end cover casting after molding is greatly improved, which makes it easier to reach the demolding conditions more quickly, which is beneficial to improving production efficiency.

[0033] By surrounding and opening two second annular grooves 501 in the second mold base 101, and making the second annular grooves 501 sleeved on the outer side of the annular seat 2, by means of the rotational connection between the two second annular grooves 501 and the two sockets 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 grooves 501, the sockets 201, and the copper tubes 4, which is beneficial to ensure the operating stability of the device.

[0034] In the specific implementation process, Fig.11 - Fig.13 As 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 carrier plate 601, and an airflow interface 604 corresponding to the adapter 5 is installed on the carrier plate 601, and the airflow interface 604 is externally connected to an air pump, and the airflow 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 fine sand and cooling water, the staff can control the movement of the carrier plate 601 through the electric push rod 605, and before switching the fine sand and cooling water filling, the airflow interface 604 is first switched to a The adapter 5 is in a connected state. If there is fine sand in the copper tube 4, the other adapter 5 remains connected to 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 connected to the cooling water return port. By starting the air pump externally connected to the airflow interface 604, high-pressure airflow is injected into the copper tube 4 to blow the fine sand or cooling water originally remaining in the copper tube 4 into the corresponding device. This can effectively reduce the probability of mutual interference between the fine sand and the cooling water in the copper tube 4. In addition, by setting the airflow interface 604 between the fine sand interface 602 and the cooling water interface 603, the fine sand and the cooling water will be cleaned by air blowing before switching, and the operation is more convenient and efficient.

[0035] Specifically, the working principle and operation method of the present invention are as follows: In the mold opening state, the pipe joint 401 is inserted into the socket 201, and then the piston blocks 301 arranged in pairs in the clamping mechanism are driven to approach each other, and the pipe joint 401 is firmly clamped in the socket 201. After the mold is closed, the copper tube 4 is in the middle position in the molding cavity 102. The two fine sand interfaces 602 and the two transfer interfaces 5 are controlled to be connected correspondingly by moving the telescopic ends of the two electric push rods 605. Fine sand is injected into the copper tube 4 for support through the external fine sand supply device. The aluminum alloy melt is injected into the molding cavity 102 through the injection channel 103. During the injection of the aluminum alloy melt, the servo motor 204 is started, and the annular 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 pre-set position. The aluminum alloy melt is pressurized and injected into the molding cavity 102 through the injection channel 103 until the molding cavity 102 is filled, and the molding cavity 102 is pressure-maintained to wait for the casting to cool down. The electric push rod 605 drives the corresponding carrier plate 601 to move, controls the airflow interface 604 to be connected to an adapter 5, and 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 through the air pump connected to the airflow interface 604, and the electric push rod 605 drives the corresponding carrier plate 601 to move, so that the two cooling water interfaces 603 and the two adapters 5 are connected to each other, and the cooling water is supplied to the copper tube 4 through the external cooling water supply device. Cooling water is injected into the internal circulation to actively cool the formed casting. When the casting reaches the conditions for mold opening and material removal, the corresponding carrier plate 601 is driven to move by the electric push rod 605, so that the airflow interface 604 is re-connected with a transfer interface 5, and the cooling water interface 603 connected to the return water port of the cooling water supply device remains connected to the corresponding transfer interface 5. The cooling water in the copper tube 4 is blown into the cooling water supply device through the air pump externally connected to the airflow interface 604, and then the mold is opened, the clamping mechanism is released, and the demolding and material removal of the casting are completed.

[0036] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which 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), 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), and a The invention is 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 arranged on the outer end wall of the second die seat (101), and the hydraulic oil interface (302) is connected to 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 a pipe joint (401) adapted to the plug hole (201), and the pipe joint (401) and the copper tube (4) are arranged vertically, and two pipe joints (401) are respectively inserted into two plug holes (201) and locked by a clamping mechanism.

2. The rear end cover casting device of an automobile power unit according to claim 1, characterized in that: The annular seat (2) is rotatably mounted in the second die base (101); an outer toothed ring (202) is fixedly sleeved on the outer end wall of the annular seat (2); a first gear (203) meshing with the outer toothed ring (202) is rotatably mounted in the second die base (101); a servo motor (204) is fixedly mounted on the outer end wall of the second die base (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 2, characterized in that: A first annular groove (303) is provided in the second die base (101) and is arranged around the outside of the annular base (2), and the first annular groove (303) is directly connected to the hydraulic oil interface (302). A hydraulic oil passage (304) is provided on the outer end wall of the annular base (2) and is directly connected to the plurality of chambers (3), and the hydraulic oil passage (304) is rotatably connected to the first annular groove (303). Two transfer interfaces (5) are provided on the outer end wall of the second die base (101). Two second annular grooves (501) are provided in the second die base (101) and are 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 2, characterized in that: 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 inside the frame shell (6), and a fine sand interface (602) is fixed on each of the bearing plates (601), and the two fine sand interfaces (602) are respectively arranged corresponding to the two transfer interfaces (5), and the two fine sand interfaces (602) are respectively externally connected to a sand outlet and a sand return outlet of a fine sand supply device.

6. The rear end cover casting device of an automobile power unit according to claim 5, characterized in that: A cooling water interface (603) is fixed on each of the bearing plates (601), and the two cooling water interfaces (603) are respectively arranged corresponding to the two adapter interfaces (5). The two cooling water interfaces (603) are respectively externally connected to the water outlet and the water return port of the cooling water supply device. The two bearing plates (601) are slidably installed in the frame shell (6), and two electric push rods (605) are fixedly installed on the frame shell (6), and the telescopic ends of the two electric push rods (605) are respectively fixedly connected to the two bearing plates (601).

7. The rear end cover casting device of an automobile power unit according to claim 6, 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).

8. 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 7, 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).

9. The casting produced by the casting device for the rear end cover of an automobile power unit according to claim 8 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).

10. 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 7, 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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