A cooling device for low pressure casting of a wheel hub casting

Abstract

The utility model discloses a kind of cooling device of wheel hub casting low-pressure casting belongs to rim casting technical field, including fixed support module, rim cooling module, wheel hub center cooling module and control system;The fixed support module includes two columns, horizontal crossbeam connecting two columns;The rim cooling module includes annular water cooling cavity, water distributor, water inlet main pipe and water outlet main pipe, annular water cooling cavity is fixed between column by locking clamp, the water distributor is welded on the outside of annular water cooling cavity and is connected with water inlet pipe and water outlet pipe;The wheel hub center cooling module includes rotary air cooling pipe, servo motor, air inlet rotary joint, the air inlet pipe end of rotary air cooling pipe is connected with rotary joint, rotary joint is connected with at least 4 radial nozzles, servo motor is fixed on horizontal crossbeam upper surface, and center air inlet pipe rotation is driven by coupling.

Description

Technical Field

[0001] This utility model belongs to the field of wheel rim casting technology, specifically relating to a cooling device for low-pressure casting of wheel hub castings. Background Technology

[0002] Low-pressure casting is the mainstream process for mass production of aluminum alloy wheels. After casting, due to the difference in wall thickness between the wheel rim and the center of the wheel, the cooling rate is different, which can easily lead to shrinkage porosity, thermal cracking, and residual stress, thus affecting the mechanical properties and dimensional accuracy of the product.

[0003] Existing technologies mostly use a single method of water spraying or air blowing for overall cooling, which has the following shortcomings: The cooling medium cannot be controlled in zones, resulting in a large temperature difference between the rim and the center area.

[0004] Therefore, there is an urgent need for a cooling device that can independently cool the rim and hub center to meet the production requirements of high-quality wheel hubs. Summary of the Invention

[0005] To address the aforementioned problems, this utility model discloses a cooling device for low-pressure casting of wheel hub castings.

[0006] To achieve the above objectives, the specific technical solution of this application is as follows: A cooling device for low-pressure casting of wheel hub castings includes a fixed support module, a rim cooling module, a hub center cooling module, and a control system. The fixed support module includes two columns and a horizontal beam connecting the two columns; The rim cooling mold includes an annular water-cooling cavity, a water distributor, an inlet main pipe, and an outlet main pipe. The annular water-cooling cavity is fixed between the columns by locking clamps. The water distributor is welded to the outside of the annular water-cooling cavity and connected to the inlet and outlet pipes. The hub center cooling module includes a rotating air-cooling pipe, a servo motor, and an air intake rotary joint. The end of the central air intake pipe of the rotating air-cooling pipe is connected to the rotary joint, and the rotary joint is connected to at least 4 radial nozzles. The servo motor is fixed to the upper surface of the horizontal beam and drives the central air intake pipe to rotate through a coupling. The control system includes a PLC and a touch screen. The PLC output is connected to a servo motor driver, and the touch screen communicates with the PLC via a bus.

[0007] Based on the above technical features, preferably, the annular water-cooling cavity is formed by laser welding of inner and outer wall plates of 304 stainless steel, and the annular water-cooling cavity is provided with spiral guide ribs.

[0008] Based on the above technical features, furthermore, the radial nozzle of the rotating air-cooled head is connected to the central air intake pipe through a hinge shaft, and an angle adjustment bolt is provided on the side of the hinge shaft.

[0009] The locking clamp includes a semi-circular band and a locking screw. The inner wall of the band is attached with a ceramic fiber heat insulation pad, and the two ends of the locking screw are respectively engaged with the threaded holes of the column.

[0010] A lifting worktable is provided below the column. The lifting worktable is moved up and down by a cylinder. A casting clamp is provided on the lifting worktable.

[0011] Compared with the prior art, the beneficial effects of this application are as follows: This application achieves independent water cooling in the rim gap and air cooling in the center of the hub, resulting in a uniform temperature field and significantly reducing defects such as shrinkage and hot cracking caused by continued cooling. The rotating air-cooled pipes and the annular water-cooled cavity are arranged coaxially, saving space and facilitating online integration next to existing low-pressure casting machines; The rim cooling module is located close to the rim and reduces the surface temperature of the rim through heat conduction through gaps. Compared with ordinary water cooling, it avoids the formation of cold shuts due to excessively rapid cooling. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the cooling device for low-pressure casting of wheel hub castings according to the present invention. List of identifiers in attached diagrams: 1. Fixed support module; 1.1 Column; 1.2 Horizontal beam; 2. Rim cooling module; 2.1 Annular water cooling chamber; 2.2 Water distributor; 2.3 Inlet main pipe; 2.4 Outlet main pipe; 2.5 Locking clamp; 3. Hub center cooling module; 3.1 Rotary air cooling pipe; 3.2 Servo motor; 3.3 Inlet rotary joint; 3.4 Nozzle; 4. Control system; 5. Lifting worktable; 6. Cylinder. Detailed Implementation

[0013] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0014] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] like Figure 1 As shown, a cooling device for low-pressure casting of wheel hub castings includes a fixed support module 1, a wheel rim cooling module 2, a wheel hub center cooling module 3, and a control system 4. The fixed support module 1 includes two columns 1.1 and a horizontal beam 1.2 connecting the two columns; The rim cooling module 2 includes an annular water-cooling cavity 2.1, a water distributor 2.2, an inlet main pipe 2.3, and an outlet main pipe 2.4. The annular water-cooling cavity 2.1 is fixed between the columns 1.1, and the water distributor 2.2 is welded to the outside of the annular water-cooling cavity and connected to the inlet and outlet pipes. The hub center cooling module 3 includes a rotating air-cooling pipe 3.1, a servo motor 3.2, and an air intake rotary joint 3.3. The rotating air-cooling pipe 3.1 has a central air intake pipe 3.1a connected to the rotary joint 3.3 at its end. The rotary joint 3.3 is connected to at least four radial nozzles 3.4. The servo motor 4.2 is fixed to the upper surface of the horizontal beam 1.2 and drives the central air intake pipe 3.1a to rotate through the coupling 4.4. The control system 4 includes a PLC and a touch screen. The output of the PLC is connected to a servo motor driver, and the touch screen communicates with the PLC via a bus.

[0016] The annular water-cooled cavity 2.1 is formed by laser welding of inner and outer wall plates of 304 stainless steel, and the annular water-cooled cavity is provided with spiral guide ribs.

[0017] The radial nozzle 3.4 of the rotating air-cooled head 3.1 is connected to the central air intake pipe 3.1a via a hinge shaft, and an angle adjustment bolt is provided on the side of the hinge shaft.

[0018] The locking clamp includes a semi-circular band and a locking screw. The inner wall of the band is attached with a ceramic fiber heat insulation pad, and the two ends of the locking screw are respectively engaged with the threaded holes of the column.

[0019] A lifting worktable is provided below the column. The lifting worktable is moved up and down by a cylinder. The lifting worktable is provided with a casting clamp. After the wheel hub is installed, the gap between the outer side of the wheel rim and the annular water cooling cavity 2.1 is 5mm. The 5mm air layer in the gap has moderate thermal resistance, which reduces the cracking rate compared with traditional water cooling.

[0020] Working principle: The rim area utilizes an annular water-cooled cavity to form a thin water gap, and the forced convection heat transfer coefficient can reach over 3000 W / (m²·K), rapidly removing heat from the rim. The central area of ​​the hub is driven by a rotating air-cooling pipe to rotate the radial nozzles at high speed, forming a uniform circumferential airflow layer, which avoids local overcooling and improves the convective heat transfer coefficient. Based on real-time temperature feedback, the PLC uses a PID algorithm to adjust the water pump frequency, servo motor speed, and proportional valve opening in a closed loop, enabling the cooling process to be repeatable and traceable.

[0021] The workflow can be summarized as casting positioning → lifting and closing → zoned cooling → resetting and picking up the casting, with the entire process being automated.

[0022] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A cooling device for low-pressure casting of wheel hub castings, characterized in that: It includes a fixed support module (1), a rim cooling module (2), a hub center cooling module (3), and a control system (4); The fixed support module (1) includes two columns (1.1) and a horizontal beam (1.2) connecting the two columns. The rim cooling module (2) includes an annular water-cooled cavity (2.1), a water distributor (2.2), an inlet main pipe (2.3), and an outlet main pipe (2.4). The annular water-cooled cavity (2.1) is fixed between the columns (1.1) by locking clamps (2.5). The water distributor (2.2) is welded to the outside of the annular water-cooled cavity and connected to the inlet and outlet pipes. The hub center cooling module (3) includes a rotating air-cooling pipe (3.1), a servo motor (3.2), and an air intake rotary joint (3.3). The rotating air-cooling pipe (3.1) has a central air intake pipe (3.1a) connected to the rotary joint (3.3) at its end. The rotary joint (3.3) is connected to at least four radial nozzles (3.4). The servo motor (3.2) is fixed to the upper surface of the horizontal beam (1.2) and drives the central air intake pipe (3.1a) to rotate through a coupling. The control system (4) includes a PLC and a touch screen. The output of the PLC is connected to a servo motor driver, and the touch screen communicates with the PLC via a bus.

2. The cooling device for low-pressure casting of wheel hub castings according to claim 1, characterized in that: The annular water-cooled cavity (2.1) is formed by laser welding of inner and outer wall plates of 304 stainless steel, and the annular water-cooled cavity is provided with spiral guide ribs.

3. The cooling device for low-pressure casting of wheel hub castings according to claim 1, characterized in that: The radial nozzle (3.4) of the rotating air-cooled pipe (3.1) is connected to the central air intake pipe (3.1a) via a hinge shaft, and an angle adjustment bolt is provided on the side of the hinge shaft.

4. The cooling device for low-pressure casting of wheel hub castings according to claim 1, characterized in that: The locking clamp (2.5) includes a semi-circular band and a locking screw. The inner wall of the band is attached with a ceramic fiber heat insulation pad, and the two ends of the locking screw are respectively engaged with the threaded holes of the column.

5. The cooling device for low-pressure casting of wheel hub castings according to claim 1, characterized in that: A lifting worktable (5) is provided below the column. The lifting worktable is moved up and down by a cylinder (6). A casting clamping position is provided on the lifting worktable.

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