Vacuum high-pressure die-casting process for magnesium alloy hub

Abstract

The invention discloses a vacuum high-pressure die-casting process for a magnesium alloy hub. The vacuum high-pressure die-casting process specifically comprises the following steps that S1, liquid oil and a casting material are heated to the required temperature; s2, the heated liquid oil is injected into a heating pipeline of a mold, and the mold is heated to the required temperature; s3, the heated casting material is put into an injection module, and a mold is closed; s4, the injection module is started, the casting material is injected into the casting cavity, meanwhile, the vacuumizing valve is started to extract gas in the casting cavity, so that the air pressure in the casting cavity reaches a negative pressure value, the vacuumizing valve is closed when injection is finished, and the negative pressure in the casting cavity is kept for a certain period of time; and S5, after the mold is cooled to a certain temperature, the mold is opened, and the casting is taken out. The vacuum high-pressure die-casting process of the magnesium alloy hub is simplified, the machining difficulty and the equipment cost of the magnesium alloy hub are reduced, the technical blank in the field is filled, and wide application prospects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy wheel hub processing, and in particular to a vacuum high-pressure die-casting process for a magnesium alloy wheel hub. Background Art

[0002] In recent years, the domestic automobile industry is gradually developing towards new energy, and lightweighting has become an important direction for the development of the automobile industry. In the process of processing new energy vehicles, wheels as safety parts for automobile driving have received sufficient attention. As a lightweight engineering structural material, magnesium alloy has broad application prospects in the fields of aviation, aerospace, 3C products, etc., but the manufacturing process of magnesium alloy automobile wheels has certain technical challenges, such as insufficient density of wheel structure, uneven composition of structure, and low mechanical strength of formed wheels. In addition, the plasticity of magnesium alloy is poor, large forgings are difficult to process, and the yield rate and mechanical properties are low, resulting in high processing costs for magnesium alloy wheels. These technical problems limit the widespread application of magnesium alloy wheels. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a vacuum high-pressure die-casting process for a magnesium alloy wheel hub to improve the performance of the magnesium alloy wheel hub and reduce the difficulty of processing. To achieve the above purpose, the specific scheme of the present invention is as follows:

[0004] A vacuum high-pressure die-casting process for a magnesium alloy wheel hub, the process adopts a die-casting component and a control system thereof, the die-casting component comprises a mold, an injection mold group and a vacuum valve, the mold has a heating pipeline and a sealed casting cavity, the injection mold group and the vacuum valve are both sealed and connected to the casting cavity, the control system comprises a main control unit and a storage unit, a detection unit, a motor control unit and a power supply unit all connected thereto, the main control unit, the detection unit and the motor control unit are all connected to the die-casting component, and the process specifically comprises the following steps:

[0005] S1: heating the liquid oil and the casting material to the required temperatures respectively;

[0006] S2: Injecting the heated liquid oil into the heating pipe of the mold to heat the mold to the required temperature;

[0007] S3: placing the heated casting into the injection mold set and closing the mold;

[0008] S4: Start the injection mold group to inject the casting into the casting cavity, and at the same time start the vacuum valve to extract the gas in the casting cavity, so that the air pressure in the casting cavity reaches a negative pressure value. When the injection is completed, close the vacuum valve to keep the negative pressure in the casting cavity for a certain period of time;

[0009] S5: After the mold cools to a certain temperature, the mold is opened and the casting is taken out.

[0010] Preferably, the detection unit comprises a temperature detection module and a voltage and current detection module, and the temperature detection module comprises a temperature sensor.

[0011] Preferably, the mold comprises a movable mold and a fixed mold, and a sealed casting cavity is formed by closing the movable mold and the fixed mold, and the temperature sensor is arranged in the casting cavity.

[0012] Preferably, in step S2, the main control unit calculates the heating temperature of the mold using a PID control algorithm according to the temperature data of the temperature sensor.

[0013] Preferably, the injection mold assembly includes a die casting cup, an injection punch and an injection rod. The die casting cup is connected to the casting cavity, and a one-way valve is provided at the connection to form a closed cavity of the casting cavity. The injection punch is connected to the injection rod and slides in the die casting cup.

[0014] Preferably, in step S4, the process of the injection mold group injecting the casting material into the casting cavity and the process of the vacuum valve evacuating the gas in the casting cavity into a vacuum are started and stopped at the same time.

[0015] Preferably, the motor control unit includes a motor drive module and a vacuum motor module and a heating tube motor module both controlled by the motor drive module, the vacuum motor module is connected to the vacuum valve, and the heating tube motor module is connected to the heating pipe.

[0016] Preferably, the main control unit includes an MCU, a memory, a button and a power supply, the power supply unit includes a battery module, a charging module and a power control module, and the storage unit uses a flash storage medium.

[0017] Preferably, the control system further comprises a data transmission unit and a display unit, the data transmission unit comprises a data packaging module and a wireless transmission module, and the display unit comprises a display screen module, an interface module and a display driving module.

[0018] The technical solution of the present invention has the following beneficial effects:

[0019] The present invention can complete the vacuum high-pressure die-casting processing of the magnesium alloy wheel hub. During the processing, the temperature of the mold is collected in real time, and the information is uploaded to the background cloud server. The large-capacity storage can record various data in the processing process and display them through the display unit. Effective control is achieved according to the currently collected working status data. At the same time, the present invention simplifies the vacuum high-pressure die-casting process of the magnesium alloy wheel hub, reduces the processing difficulty and equipment cost of the magnesium alloy wheel hub, fills the technical gap in this field, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a flow chart of the present invention;

[0021] Figure 2 It is a functional module block diagram of the control system of the present invention;

[0022] Figure 3 It is a cross-sectional view of the die-cast component of the present invention.

[0023] Among them, 1-main control unit, 2-storage unit, 3-detection unit, 4-motor control unit, 5-power supply unit, 6-data transmission unit, 7-display unit, 8-die casting component, 801-movable mold, 802-fixed mold, 803-casting cavity, 804-heating pipe, 805-die casting melting cup, 806-injection punch, 807-injection rod, 808-check valve, 809-vacuum valve, 810-casting material. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Reference Figure 1 The present invention provides a vacuum high-pressure die-casting process for a magnesium alloy wheel hub, which specifically comprises the following steps:

[0026] S1: heating the liquid oil and the casting material to the required temperatures respectively;

[0027] S2: Injecting the heated liquid oil into the heating pipe of the mold to heat the mold to the required temperature;

[0028] S3: placing the heated casting into the injection mold set and closing the mold;

[0029] S4: Start the injection mold group to inject the casting into the casting cavity, and at the same time start the vacuum valve to extract the gas in the casting cavity, so that the air pressure in the casting cavity reaches a negative pressure value. When the injection is completed, close the vacuum valve to keep the negative pressure in the casting cavity for a certain period of time;

[0030] S5: After the mold cools to a certain temperature, the mold is opened and the casting is taken out.

[0031] In step S2, the main control unit calculates the heating temperature of the mold using a PID control algorithm based on the temperature data of the temperature sensor. The PID control algorithm uses existing technology and will not be described in detail.

[0032] In the step S4, the process of the injection mold group injecting the casting material into the casting cavity and the process of the vacuum valve evacuating the gas in the casting cavity into vacuum are started and ended at the same time.

[0033] The process uses die-cast components and their control systems, referring to Figure 2The control system includes a main control unit 1 and a storage unit 2, a detection unit 3, a motor control unit 4, a power supply unit 5, a data transmission unit 6 and a display unit 7, all of which are connected thereto. The main control unit 1, the detection unit 3 and the motor control unit 4 are all connected to a die-casting component 8.

[0034] Reference Figure 3 The die casting assembly 8 includes a die, an injection mold group and a vacuum valve 809, a heating pipe 804 is arranged in the die, the die includes a movable die 801 and a fixed die 802, and a sealed casting cavity 803 appears after the movable die 801 and the fixed die 802 are closed, the heating pipe 804 forms a U-shaped channel in the movable die 801 and the fixed die 802 respectively, the injection mold group includes a die casting melting cup 805, an injection punch 806 and an injection rod 807, The die-casting cup 805 is connected to the casting cavity 803, and a one-way valve 808 is provided at the connection to form a closed cavity for the casting cavity 803. The injection punch 806 is connected to the injection rod 807 and slides in the die-casting cup 805. In the above step S3, the robotic arm puts the heated casting into the injection mold assembly through the cup mouth of the die-casting cup 805, and pushes the casting into the casting cavity 803 by sliding the injection punch 806 in the die-casting cup 805.

[0035] Continue to refer to Figures 2 to 3 The main control unit 1 includes an MCU, a memory, a button and a power supply, and is used to control the opening and closing of the mold and control the injection mold group to inject the casting 810 into the casting cavity 803.

[0036] The detection unit 3 includes a temperature detection module and a voltage and current detection module. The temperature detection module includes a temperature sensor. The temperature sensor is arranged in the casting cavity 803 and is used to detect the temperature of the mold.

[0037] The motor control unit 4 includes a motor drive module, a vacuum motor module and a heating tube motor module. The vacuum motor module is connected to the vacuum valve 809, and the vacuum motor module is driven by the motor drive module to control the vacuum valve 809 to extract the air pressure in the casting cavity 803. The heating tube motor module is connected to the heating pipe 804, and the heating pipe motor module is driven by the motor drive module to transport hot oil or coolant into the heating pipe 804.

[0038] The storage unit 2 uses flash storage media to store various types of data running in various parts of the system in local storage space. The power supply unit 5 includes a battery module, a charging module and a power control module to provide power for the system and ensure the normal operation of the system. The data transmission unit 6 includes a data packaging module and a wireless transmission module to achieve reliable data transmission. The wireless transmission module can transmit data to a cloud server. The display unit 7 includes a display screen module, an interface module and a display driver module to display the status and function of the system.

[0039] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the protection scope of the present invention.

Claims

1. A vacuum high pressure die casting process for a magnesium alloy wheel hub, characterized in that: The process adopts a die-casting component and a control system thereof, wherein the die-casting component includes a mold, an injection mold group and a vacuum valve, wherein a heating pipe and a sealed casting cavity are provided in the mold, wherein the injection mold group and the vacuum valve are both sealed and connected to the casting cavity, wherein the control system includes a main control unit and a storage unit, a detection unit, a motor control unit and a power supply unit connected thereto, wherein the main control unit, the detection unit and the motor control unit are all connected to the die-casting component, and wherein the process specifically includes the following steps: S1: heating the liquid oil and the casting material to the required temperatures respectively; S2: Injecting the heated liquid oil into the heating pipe of the mold to heat the mold to a desired temperature; S3: placing the heated casting into the injection mold set and closing the mold; S4: Start the injection mold group to inject the casting into the casting cavity, and at the same time start the vacuum valve to extract the gas in the casting cavity, so that the air pressure in the casting cavity reaches a negative pressure value. When the injection is completed, close the vacuum valve to keep the negative pressure in the casting cavity for a certain period of time; S5: After the mold cools to a certain temperature, the mold is opened and the casting is taken out.

2. The vacuum high pressure die casting process of magnesium alloy wheel hub according to claim 1, characterized in that: The detection unit includes a temperature detection module and a voltage and current detection module, and the temperature detection module includes a temperature sensor.

3. The vacuum high pressure die casting process of the magnesium alloy wheel hub according to claim 2, characterized in that: The mold comprises a movable mold and a fixed mold. After the movable mold and the fixed mold are closed, a sealed casting cavity is formed. The temperature sensor is arranged in the casting cavity.

4. The vacuum high pressure die casting process for magnesium alloy wheel hub according to claim 3, characterized in that: In step S2, the main control unit calculates the heating temperature of the mold using a PID control algorithm according to the temperature data of the temperature sensor.

5. The vacuum high pressure die casting process of magnesium alloy wheel hub according to claim 1, characterized in that: The injection mold assembly includes a die casting cup, an injection punch and an injection rod. The die casting cup is connected to the casting cavity, and a one-way valve is provided at the connection to form a closed cavity of the casting cavity. The injection punch is connected to the injection rod and slides in the die casting cup.

6. The vacuum high pressure die casting process for magnesium alloy wheel hub according to claim 5, characterized in that: In step S4, the process of the injection mold group injecting the casting material into the casting cavity and the process of the vacuum valve evacuating the gas in the casting cavity into vacuum are started and stopped at the same time.

7. The vacuum high pressure die casting process for magnesium alloy wheel hub according to claim 1, characterized in that: The motor control unit includes a motor drive module and a vacuum motor module and a heating tube motor module both of which are controlled by the motor drive module. The vacuum motor module is connected to a vacuum valve, and the heating tube motor module is connected to a heating pipeline.

8. The vacuum high pressure die casting process for magnesium alloy wheel hub according to claim 1, characterized in that: The main control unit includes an MCU, a memory, a button and a power supply, the power supply unit includes a battery module, a charging module and a power control module, and the storage unit uses a flash storage medium.

9. The vacuum high pressure die casting process of magnesium alloy wheel hub according to claim 1, characterized in that: The control system further comprises a data transmission unit and a display unit. The data transmission unit comprises a data packaging module and a wireless transmission module. The display unit comprises a display screen module, an interface module and a display driving module.

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