A low pressure casting process for a turbocharger turbine housing

Abstract

The present application belongs to the technical field of low pressure casting, and relates to a low pressure casting process for a turbocharger turbine shell. The present application comprises S1, closing the upper mold and the lower mold for casting, and the first side of the chain plate conveyor is placed with a shaped part. S2, after the mold is opened, the chain plate conveyor moves to the upper mold so that the second side extends below the upper mold to receive the new shaped part for demolding, and the shaped part on the first side acts as a counterweight to inhibit the second side from turning downward. S3, the chain plate conveyor retreats and operates, outputs the shaped part on the first side, and moves the new shaped part on the second side to the first side as the counterweight for the next cycle. By using the completed shaped part as a dynamic counterweight, the present application effectively inhibits the downward turning tendency of the chain plate conveyor when it is suspended to receive the material, avoids damage to the mechanism, and through the linkage of the chain plate conveyor and the conveying assembly, realizes automatic replacement of the counterweight, significantly improves the production efficiency and automation level of the turbine shell casting.

Description

Technical Field

[0001] This invention belongs to the field of low-pressure casting technology, and relates to a low-pressure casting process for turbocharger turbine housings. Background Technology

[0002] With the continuous development of automotive lightweighting technology, new high-performance die-cast aluminum alloys are increasingly widely used in turbocharger housing manufacturing due to their excellent mechanical properties and lightweight advantages. As a key component for increasing engine intake air volume, improving power performance, and reducing emissions, the turbocharger has a complex housing structure and high sealing requirements, and is often formed using low-pressure casting technology. In the low-pressure casting production line for aluminum alloy turbine housings, the cast parts need to be demolded from the upper mold and transported to the next processing step via a receiving and transfer mechanism.

[0003] In existing demolding and receiving processes, a receiving arm or a horizontal conveyor is typically used to extend between the upper and lower molds to catch the falling casting. However, when the receiving mechanism extends under the mold to catch the casting, its extended end is often suspended in the air. When the casting falls from the upper mold to the suspended end of the receiving mechanism, the weight of the casting causes a downward overturning torque on the receiving mechanism. Prolonged exposure to this overturning torque can easily cause the suspended end of the receiving mechanism to tilt downwards, leading to stress concentration at the connection between the receiving mechanism and the external support. This can cause the connection structure to loosen or be damaged, affecting the stability and service life of the equipment and reducing overall production efficiency.

[0004] To address the above problems, this invention proposes a low-pressure casting process for turbocharger turbine housings. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention proposes a low-pressure casting process for turbocharger turbine housings.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a low-pressure casting process for a turbocharger turbine housing, comprising the following steps: S1. The upper and lower molds are closed to cast the turbine housing; the forming part is placed on the first side of the chain conveyor. S2. After casting is completed, the upper mold and the lower mold are opened; the chain conveyor moves toward the upper mold, so that its second side extends below the upper mold, and the upper mold is demolded so that the newly cast part falls onto the second side of the chain conveyor; the part on the first side acts as a counterweight to suppress the downward flipping tendency of the second side of the chain conveyor. S3. Move the chain conveyor away from the upper mold and operate the chain conveyor to output the formed part located on the first side, and move the formed part located on the second side to the first side of the chain conveyor.

[0007] Furthermore, the chain conveyor is slidably mounted on the support base, and a guide groove is provided on one side of the chain conveyor. A T-shaped guide block is fixedly connected to the inner side of the support base, and the T-shaped guide block slides in cooperation with the guide groove.

[0008] Furthermore, a motor is installed on the support base, and a third gear is fixedly connected to the output shaft of the motor. The chain conveyor is fixedly connected to a rack that meshes with the third gear.

[0009] Furthermore, in step S3, the chain conveyor outputs the formed part from the first side to the conveying assembly, which is located on the side of the support away from the upper mold.

[0010] Furthermore, in step S3, when the chain conveyor retracts to a preset position away from the upper mold, the drive shaft of the chain conveyor is connected to the drive shaft of the conveying assembly; when the conveying assembly is running, it drives the chain conveyor to run, thereby conveying the formed part on the first side to the conveying assembly, and at the same time moving the formed part on the second side to the first side.

[0011] Furthermore, the drive shaft of the chain conveyor is fixedly connected to a second gear, and the drive shaft of the conveying assembly near the end of the chain conveyor is fixedly connected to a first gear. The first gear is meshed with a fourth gear. The fourth gear is rotatably mounted on the conveying assembly. When the chain conveyor returns to a preset position, the second gear meshes with the fourth gear.

[0012] Compared with the prior art, the present invention has the following advantages: It utilizes the weight of the formed part processed in the previous step as a counterweight. When the chain conveyor extends under the upper mold to receive the material, the gravitational torque generated by the formed part on the first side can counteract the impact and downward overturning tendency of the suspended end on the second side due to receiving the fallen formed part. This avoids damage to the connection between the suspended end of the chain conveyor and the support base caused by tilting and overturning under force, extends the service life of the equipment, and ensures high stability in continuous low-pressure casting production.

[0013] Meanwhile, through the dynamic meshing of the second and fourth gears, the counterweight switching is completed simultaneously with material output. The operation is smooth and efficient, significantly improving the automation level and production efficiency of turbine housing low-pressure casting production, and has good application value. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the low-pressure casting machine body in this invention; Figure 3This is a schematic diagram of the cooperation between the chain conveyor and the support base in this invention; Figure 4 This is a schematic diagram of the chain conveyor in this invention; Figure 5 This is a schematic diagram of the support base in this invention.

[0015] In the diagram: 1. Low-pressure casting machine body; 2. Upper mold; 3. Lower mold; 4. Chain conveyor; 5. Formed part; 6. Support base; 7. Motor; 8. Conveying assembly; 9. First gear; 10. Guide groove; 11. Rack; 12. Second gear; 13. T-shaped guide block; 14. Third gear; 15. Fourth gear. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1-5 As shown, the technical solution adopted by the present invention is as follows: a low-pressure casting process for a turbocharger turbine housing is based on a low-pressure casting machine body 1, a chain conveyor 4, and a conveying assembly 8.

[0018] like Figure 1 and Figure 2 As shown, the main body 1 of the low-pressure casting machine is provided with an upper mold 2 and a lower mold 3. The upper mold 2 can move up and down relative to the lower mold 3 to realize mold closing casting and mold opening demolding.

[0019] like Figure 1 As shown, the support base 6 is located on the right side of the low-pressure casting machine body 1. The support base 6 is fixedly installed on the ground or the casting machine base to provide sliding support for the chain conveyor 4. The conveying assembly 8 is located on the right side of the support base 6.

[0020] like Figure 3 , Figure 4 and Figure 5 As shown, the chain conveyor 4 is slidably mounted on the support base 6. Specifically, the chain conveyor 4 has a guide groove 10 along its length edge, and a T-shaped guide block 13 is fixedly connected to the inner side of the support base 6, with the T-shaped guide block 13 slidingly engaging with the guide groove 10. Through the sliding guidance of the T-shaped guide block 13 and the guide groove 10, the chain conveyor 4 can reciprocate linearly in the horizontal direction relative to the support base 6.

[0021] In this embodiment, for ease of description, the right side of the bearing surface of the chain conveyor 4, that is, the side away from the low-pressure casting machine body 1, is defined as the first side, and a forming part 5 as a counterweight is placed on the first side. The left side, that is, the side closer to the low-pressure casting machine body 1, is defined as the second side, which can extend into the lower mold 3 to receive the newly demolded forming part 5.

[0022] A motor 7 is also mounted on the support base 6, and the output shaft of the motor 7 is fixedly connected to a third gear 14. A rack 11 is fixedly connected to the chain conveyor 4, and the rack 11 extends along the length of the chain conveyor 4 and meshes with the third gear 14. When the motor 7 rotates in the forward or reverse direction, the rotational motion of the motor 7 can be converted into the horizontal reciprocating linear motion of the chain conveyor 4 along the support base 6 through the meshing transmission of the third gear 14 and the rack 11.

[0023] like Figure 1 , Figure 4 As shown, a second gear 12 is fixedly connected to the drive shaft at one end of the chain conveyor 4. The conveying assembly 8 is a belt or roller conveyor device used to transfer the formed part 5 to the next process. A first gear 9 is fixedly connected to the drive shaft at one end of the conveying assembly 8 near the chain conveyor 4. The first gear 9 is meshed with a fourth gear 15, which is rotatably mounted on the frame or support structure of the conveying assembly 8.

[0024] When the chain conveyor 4 retracts to the right (i.e., away from the upper mold 2) along the support seat 6 to the preset position, the second gear 12 and the fourth gear 15 mesh, thereby realizing the transmission connection between the drive shaft of the chain conveyor 4 and the drive shaft of the conveying assembly 8. When the conveying assembly 8 is running, the first gear 9 drives the fourth gear 15 to rotate, the fourth gear 15 drives the second gear 12 to rotate, and the second gear 12 drives the chain conveyor 4 to run, thereby causing the formed parts 5 on the chain conveyor 4 to be conveyed to the right, so that the formed parts 5 located on the first side of the chain conveyor 4 move to the conveying assembly 8, and the formed parts 5 on the second side of the chain conveyor 4 move to the position on the first side of the chain conveyor 4.

[0025] The specific steps of the low-pressure casting process for the turbine housing of a turbocharger in this invention are as follows: S1. Mold closing casting: The upper mold 2 and the lower mold 3 are closed to cast the turbine housing; the first side of the chain conveyor 4 is equipped with the formed part 5.

[0026] Specifically, firstly, the upper mold 2 moves downwards and closes with the lower mold 3, then molten metal is injected into the mold to perform low-pressure casting of the turbine housing. At this time, the chain conveyor 4 is located on the right side of the low-pressure casting machine body 1 to avoid interference with the mold closing action.

[0027] Meanwhile, a formed part 5 is placed on the first side of the chain conveyor 4.

[0028] It should be noted that before the first casting cycle begins, a forming part 5 or a counterweight can be placed manually or by an external robot on the first side of the chain conveyor 4. In subsequent continuous casting, the forming part 5 produced will automatically replace it.

[0029] S2, Mold opening and material receiving: After casting is completed, the upper mold 2 and lower mold 3 are opened, and the chain conveyor 4 moves towards the upper mold 2, extending its second side below the upper mold 2. The upper mold 2 is then demolded, causing the newly cast part 5 to fall onto the second side of the chain conveyor 4. The part 5 on the first side acts as a counterweight to suppress the downward tilting tendency of the second side of the chain conveyor 4.

[0030] Specifically, after the turbine housing is cast, the upper mold 2 moves upward to separate from the lower mold 3, and continues to rise to a predetermined height to make room for the entry of the chain conveyor 4. At this time, the newly cast turbine housing part 5 is attached to the upper mold 2.

[0031] Next, the motor 7 is started to rotate in the forward direction. The output shaft of the motor 7 drives the third gear 14 to rotate. The third gear 14, through meshing with the rack 11, drives the rack 11 and the chain conveyor 4 fixedly connected to it to move horizontally to the left (i.e., towards the upper mold 2) along the support seat 6. During the movement, the T-shaped guide block 13 slides relative to each other in the guide groove 10 to ensure that the chain conveyor 4 moves smoothly.

[0032] The chain conveyor 4 moves to the left until its second side extends into the space between the upper mold 2 and the lower mold 3, and the second side is located directly below the upper mold 2. At this time, the second side of the chain conveyor 4 is suspended in the air and has no direct support below it.

[0033] Then, the upper mold 2 is operated to perform a demolding action, so that the newly cast molded part 5 is removed from the upper mold 2 and falls onto the second side of the chain conveyor 4.

[0034] During this process, since a pre-placed forming part 5 is placed on the first side of the chain conveyor 4, the gravity of the forming part 5 acts on the first side of the chain conveyor 4, creating a downward torque. This balances the downward overturning torque generated by the gravity of the newly received forming part 5 on the second side, effectively suppressing the downward overturning tendency of the suspended part on the second side of the chain conveyor 4 due to the gravity of the new forming part. This significantly improves the stability of material receiving and avoids damage to the connection between the suspended part of the chain conveyor 4 and the support seat 6 caused by downward overturning under force, thus affecting processing efficiency.

[0035] After the new molded part falls onto the chain conveyor 4, the upper mold 2 is raised further or kept in a high position to avoid affecting the conveying of subsequent molded parts.

[0036] S3. Return and Transfer: The chain conveyor 4 is moved away from the upper mold 2 and operated to output the formed part 5 located on the first side and move the formed part 5 located on the second side to the first side of the chain conveyor 4.

[0037] Specifically, after receiving the material, the motor 7 is started to rotate in the reverse direction. The motor 7 drives the third gear 14 to rotate in the reverse direction. The third gear 14 drives the chain conveyor 4 to move horizontally back to the right (i.e. away from the upper mold 2) along the support seat 6 through meshing with the rack 11.

[0038] As the chain conveyor 4 moves back to the right, the forming parts 5 on the first side and the forming parts 5 on the second side move to the right together with the chain conveyor 4.

[0039] When the chain conveyor 4 retracts to the preset position to the right, the second gear 12, which is fixedly connected to the drive shaft of the chain conveyor 4, meshes with the fourth gear 15, which is rotatably mounted on the conveying assembly 8.

[0040] Subsequently, the conveyor assembly 8 is started. The drive shaft of the conveyor assembly 8 drives the first gear 9 to rotate, the first gear 9 drives the fourth gear 15 to rotate, and the fourth gear 15 drives the second gear 12 to rotate, thereby rotating the drive shaft of the chain conveyor 4 and starting the chain conveyor 4 to operate. At this time, the second gear 12 rotates in the same direction as the first gear 9, ensuring that the conveying direction of the chain conveyor 4 is consistent with the conveying direction of the conveyor assembly 8.

[0041] During the operation of the chain conveyor 4, the formed part 5 located on the first side of the chain conveyor 4 is conveyed to the right by the chain conveyor 4 and transferred to the conveying assembly 8, which then transfers the formed part 5 to the next process. At the same time, the formed part 5 originally located on the second side of the chain conveyor 4 is moved to the first side of the chain conveyor 4 by the operation of the chain conveyor 4, becoming the counterweight when the chain conveyor 4 moves to the left to receive material in the next casting cycle, realizing automatic counterweight update and continuous and efficient transfer.

[0042] When the formed part 5 on the second side moves to the first side of the chain conveyor 4, the operation of the conveying assembly 8 is stopped, and the chain conveyor 4 can be disconnected from the conveying assembly 8, so that the next casting cycle can be carried out.

[0043] Accordingly, a forming part 5 is placed on the first side of the chain conveyor 4 as a movable counterweight during suspended material receiving. When the second side of the chain conveyor 4 extends under the upper mold 2 to receive a new casting, the gravitational torque of the forming part 5 on the first side is used to suppress the downward overturning tendency of the second side caused by the gravity of the forming part 5. After receiving the material, the chain conveyor 4 retracts and is connected to the conveying assembly 8. By operating the chain conveyor 4, the forming part 5 on the first side is output to the conveying assembly 8, while the forming part 5 on the second side is moved to the first side, automatically completing the replacement of the counterweight and preparing for the next casting cycle.

[0044] By using the pre-processed shaped part 5 as a dynamic counterweight, the existing materials on the production line are fully utilized, eliminating the need for additional counterweight blocks or devices, thus reducing equipment costs and space requirements. Simultaneously, the dynamic meshing of the second gear 12 and the fourth gear 15 enables counterweight switching to be completed simultaneously with material output, resulting in smooth and efficient operation and significantly improving the automation level and production efficiency of turbine housing low-pressure casting.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-pressure casting process for a turbocharger turbine housing, characterized in that, Includes the following steps: S1. The upper mold (2) and the lower mold (3) are closed and the turbine housing is cast; the forming part (5) is placed on the first side of the chain conveyor (4); S2. After casting is completed, the upper mold (2) and the lower mold (3) are opened; the chain conveyor (4) moves toward the upper mold (2) so that its second side extends below the upper mold (2), and the upper mold (2) is demolded so that the newly cast part (5) falls onto the second side of the chain conveyor (4); the part (5) on the first side acts as a counterweight to suppress the downward flipping tendency of the second side of the chain conveyor (4); S3. Move the chain conveyor (4) away from the upper mold (2) and operate the chain conveyor (4) to output the forming part (5) located on the first side and move the forming part (5) located on the second side to the first side of the chain conveyor (4).

2. The low-pressure casting process for a turbocharger turbine housing according to claim 1, characterized in that: The chain conveyor (4) is slidably mounted on the support base (6). A guide groove (10) is provided on one side of the chain conveyor (4). A T-shaped guide block (13) is fixedly connected to the inner side of the support base (6). The T-shaped guide block (13) and the guide groove (10) are slidably engaged.

3. The low-pressure casting process for a turbocharger turbine housing according to claim 2, characterized in that: A motor (7) is installed on the support base (6), and a third gear (14) is fixedly connected to the output shaft of the motor (7). A rack (11) that meshes with the third gear (14) is fixedly connected to the chain conveyor (4).

4. The low-pressure casting process for a turbocharger turbine housing according to claim 1, characterized in that: In step S3, the chain conveyor (4) outputs the formed part (5) on the first side to the conveying assembly (8), which is located on the side of the support (6) away from the upper mold (2).

5. The low-pressure casting process for a turbocharger turbine housing according to claim 4, characterized in that: In step S3, when the chain conveyor (4) retracts to a preset position away from the upper mold (2), the drive shaft of the chain conveyor (4) is connected to the drive shaft of the conveying assembly (8); when the conveying assembly (8) is running, it drives the chain conveyor (4) to run, thereby conveying the forming part (5) on the first side to the conveying assembly (8), and at the same time moving the forming part (5) on the second side to the first side.

6. The low-pressure casting process for a turbocharger turbine housing according to claim 4, characterized in that: The drive shaft of the chain conveyor (4) is fixedly connected to a second gear (12), and the drive shaft of the conveying assembly (8) near the chain conveyor (4) is fixedly connected to a first gear (9). The first gear (9) is meshed with a fourth gear (15). The fourth gear (15) is rotatably mounted on the conveying assembly (8). When the chain conveyor (4) retracts to a preset position, the second gear (12) meshes with the fourth gear (15).

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