Vehicle area controller shell surface heat treatment process and device

Abstract

The invention discloses a heat treatment process and device for the surface of a vehicle area controller shell, relates to the technical field of heat treatment processes, and aims to improve the technical problem that the assembly precision is affected due to deformation caused by uneven temperature during heat treatment of the vehicle area controller shell (thin wall and dense radiating fins). The method sequentially comprises the six steps of pretreatment, fine sand preheating and temperature control (a temperature bidirectional closed-loop reverse control system stabilizes the sand temperature in a preset interval), sand body coating, constant-temperature heat treatment and temperature control (double-temperature monitoring and graded power adjustment), gradient cooling and temperature control and aftertreatment, and the matched device comprises a fine sand preheating structure, a temperature detection module, a fine sand recycling structure and a tool assembly. Uniform heat transfer is achieved through fine sand flexible coating, temperature accuracy is guaranteed through a two-way closed-loop temperature control system, the deformation quantity of the shell is greatly reduced, meanwhile, the mechanical property of the shell is improved, and the method is suitable for the surface heat treatment process of various thin-wall special-shaped metal components.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, specifically to a heat treatment process and apparatus for the surface of a vehicle domain controller housing. Background Technology

[0002] The key role of heat treatment is to improve the physical properties (strength, toughness, etc.) of materials. The difference is that the specific temperature during the heat treatment process is limited according to the material's structural characteristics (shape, size) / physical properties (temperature limit). The following is a supplementary explanation using the vehicle domain controller housing as an example.

[0003] From the perspective of structural strength, materials such as aluminum alloys are often used. Heat treatment is used to improve the overall structural strength, thereby better protecting the vehicle controller. However, considering the structural characteristics of the housing, in order to achieve heat dissipation and lightweight, it includes multiple sets of heat dissipation fins and has a relatively thin overall wall thickness, resulting in relatively high heat transfer efficiency. But in actual process, if the temperature distribution is uneven or the cooling efficiency is different during heating, residual stress may occur in local locations, affecting the subsequent assembly process. This is especially true for housing products with more complex structures, where the degree of deformation is aggravated. In addition, the housing of the vehicle domain controller is relatively small. If structural restrictions / protection are applied to a single product, although it can provide significant deformation protection, it will increase the heat treatment process and production costs. This invention proposes a solution to this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a heat treatment process and apparatus for the surface of a vehicle domain controller housing. For the heat treatment process of thin-walled products such as vehicle domain controller housings, due to the structural characteristics of their thin walls, the degree of product deformation will be aggravated by temperature changes during the heat treatment process. Therefore, an optimized heat treatment method is proposed.

[0005] The objective of this invention can be achieved through the following technical solution: a heat treatment process for the surface of a vehicle domain controller housing, using fine sand as the heat transfer medium, and comprising the following steps: Pre-processing and tooling positioning: Clean the surface of the vehicle domain controller housing and place the cleaned housing into a special tooling; Fine sand preheating and temperature control: The fine sand is directly heated and preheated to the preset heat treatment temperature range by temperature control. Sand coating: The preheated fine sand is evenly coated on the outer shell to ensure that all parts of the outer shell and the gaps between the heat dissipation fins are filled with fine sand; Constant temperature heat treatment and temperature control: Construct a two-way closed-loop temperature control system, and monitor the temperature of fine sand and vehicle domain controller housing in real time through the two-way closed-loop temperature control system. Adjust the heating power based on the temperature feedback data to maintain the vehicle domain controller housing within the target heat treatment temperature range. Gradient cooling and temperature control: The cooling rate of fine sand is adjusted through a two-way closed-loop temperature control system, and a preset cooling gradient curve is used to drive the outer shell to cool synchronously in a gradient manner. Post-processing: Remove fine sand, clean the outer shell, and test for deformation and performance.

[0006] Further configured as follows: the temperature control method in the fine sand preheating and temperature control step is as follows: the temperature bidirectional closed-loop reverse control system first sets the fine sand preheating target temperature according to the heat treatment process requirements of the shell material, and then obtains the actual temperature of the fine sand in real time through the temperature acquisition element. When the actual temperature is lower than the lower limit of the preheating target temperature, the temperature bidirectional closed-loop reverse control system controls the heating module to increase the heating power. When the actual temperature is higher than the upper limit of the preheating target temperature, the two-way closed-loop temperature control system reduces the heating power or stops heating until the fine sand temperature drops back to the target range. During the preheating process, the system records the fine sand temperature data once at intervals and forms a temperature change curve.

[0007] Further configured as follows: In the sand coating step, a layered coating method is adopted to achieve uniform filling of the shell with fine sand: First, the bottom and side areas of the shell are initially covered with fine sand. During the coating process, a vibration device is used to slightly vibrate the special tooling. Then, fine sand is added to the top of the shell and the dense fin area. During the addition process, the surface of the fine sand is leveled. After the coating is completed, the fine sand filling status of the fin gap is checked by the detection element. If there are gaps that are not filled in place, the fine sand is assisted to flow and fill them by high-pressure air blowing until all areas of the shell are completely covered by fine sand.

[0008] The process of the constant temperature heat treatment and temperature control step is further configured to include the following: S1: First, set the constant temperature duration according to the wall thickness and material characteristics of the vehicle domain controller shell. In the initial stage of constant temperature, the temperature bidirectional closed-loop reverse control system collects the temperature data of the fine sand and the shell. When the temperature of both is stable within the target heat treatment temperature range and the temperature difference is less than the preset threshold, it enters a stable constant temperature state. At this time, the temperature acquisition frequency is reduced. S2: If the temperature data collected during the constant temperature process deviates from the target heat treatment temperature range, first analyze the magnitude and rate of temperature deviation, and then adjust the heating power according to the deviation. When the temperature deviation is large, a stepped power adjustment method is adopted.

[0009] Further configured as follows: In the gradient cooling and temperature control step, a preset cooling gradient curve is set in stages according to the structural complexity of the shell, including the following: Initial cooling phase: A lower cooling rate is used to allow the outer casing temperature to decrease slowly; During the middle stage of cooling, once the outer casing temperature drops to the preset transition temperature, the cooling rate is increased. In the later stages of cooling, when the outer casing temperature approaches room temperature, the cooling rate is reduced again. Throughout the cooling process, the two-way closed-loop temperature control system compares the deviation between the actual cooling curve and the preset curve in real time. If the deviation exceeds the allowable range, the cooling rate is corrected by adjusting the working intensity of the cooling module, so that the actual cooling process conforms to the preset curve.

[0010] The post-processing steps are further configured to include the following: Action 1: First, tilt the outer shell by flipping the tooling, and use gravity to make most of the fine sand fall off the surface and gaps of the shell and fall into the sand recovery area. Action 2: Then, high-pressure airflow is used to blow away the shell surface and fin gaps to remove residual fine sand particles. During the blowing process, the airflow pressure is controlled to avoid deformation of the shell caused by the high-pressure airflow. After the second step of cleaning is completed, the deformation of the key assembly dimensions of the shell is first detected by the dimensional inspection equipment, and then the hardness, tensile strength and other performance indicators of the shell are detected by the mechanical property testing equipment. If the test results do not meet the requirements, the reasons for the deviation of the process parameters are analyzed and the subsequent heat treatment process is adjusted.

[0011] The present invention also proposes a heat treatment device for the surface of a vehicle domain controller housing, which is applied to the above-mentioned heat treatment process for the surface of a vehicle domain controller housing, including a fine sand preheating structure, a temperature detection module, a fine sand recovery structure, and a tooling assembly.

[0012] The present invention has the following beneficial effects: 1. Addressing the challenges of heat treatment for the vehicle domain controller housing (thin-walled with dense heat dissipation fins), a two-way closed-loop temperature control system is employed, using fine sand as the heat transfer medium. This approach differs significantly from conventional heat treatment methods. Simultaneously monitoring the temperatures of both the fine sand and the housing, and employing graded judgments and corresponding adjustment strategies based on deviation values ​​and rates, precise temperature control is achieved throughout the entire heat treatment process. This stabilizes the housing temperature within the target range, preventing residual stress caused by uneven local temperatures, significantly reducing the deformation of the thin-walled housing and fins, and ensuring subsequent assembly accuracy. The gradient cooling process features staged cooling rates tailored to the housing's structural characteristics, further minimizing deformation during cooling.

[0013] 2. Using fine sand as the heat transfer medium, through layered coating + vibration assistance + high-pressure air blowing filling, it is ensured that all parts of the shell (especially the gaps between fins) are completely filled with fine sand, so as to achieve uniform heat transfer and solve the problem of heat transfer dead zones in the fin area in traditional heat treatment. This improves the overall mechanical properties (hardness, tensile strength) of the shell and makes them more uniform. The coating of fine sand can also form a "flexible support" for the thin-walled shell during the heat treatment process, preventing the shell from undergoing unorienting deformation, thus balancing heat treatment strengthening and structural integrity. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the surface heat treatment process and device for the vehicle domain controller housing proposed in this invention. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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] Example 1: Regarding the heat treatment process of thin-walled products such as vehicle domain controller housings, due to their thin-walled structural characteristics, the deformation of the product will be aggravated by temperature changes during heat treatment. Therefore, an optimized heat treatment method is proposed, and the following technical solution is proposed: Reference Figure 1 The heat treatment process for the surface of the vehicle domain controller housing in this embodiment uses fine sand as the heat transfer medium and includes the following steps: Pre-processing and tooling positioning: Clean the surface of the vehicle domain controller housing and place the cleaned housing into a special tooling; Fine sand preheating and temperature control: The fine sand is directly heated and preheated to the preset heat treatment temperature range by temperature control. Sand coating: The preheated fine sand is evenly coated on the outer shell to ensure that all parts of the outer shell and the gaps between the heat dissipation fins are filled with fine sand; Constant temperature heat treatment and temperature control: Construct a two-way closed-loop temperature control system, and monitor the temperature of fine sand and vehicle domain controller housing in real time through the two-way closed-loop temperature control system. Adjust the heating power based on the temperature feedback data to maintain the vehicle domain controller housing within the target heat treatment temperature range. Gradient cooling and temperature control: The cooling rate of fine sand is adjusted through a two-way closed-loop temperature control system, and a preset cooling gradient curve is used to drive the outer shell to cool synchronously in a gradient manner. Post-processing: Remove fine sand, clean the outer shell, and test for deformation and performance.

[0018] Principle explanation: The core of this invention is to use fine sand as a heat transfer medium. By completely encasing the vehicle domain controller shell with fine sand, the product's external deformation is avoided while providing a heat treatment environment. The key to this invention is the temperature control method based on a two-way closed-loop temperature control system. The control logic of the two-way closed-loop temperature control system is based on a closed-loop cycle of "setting target - real-time data acquisition - deviation analysis - power / cooling intensity adjustment - re-acquisition". Through bidirectional monitoring of the fine sand and shell temperature, it achieves precise temperature control throughout the entire heat treatment process. The overall process is divided into four core links: target value calibration, data acquisition and transmission, deviation logic analysis, and actuator adjustment. These links work together to form a complete temperature control chain, which specifically includes the following: 1. The system first matches the corresponding heat treatment temperature range, constant temperature duration, cooling gradient and other core parameters based on the basic attributes such as shell material, wall thickness and structural complexity, and establishes the temperature control benchmark for each process to realize the "process requirements - parameter preset" pre-processing method. 2. Using the temperature of fine sand (Ts) and the temperature of the vehicle domain controller housing (Th) as dual monitoring dimensions, the temperature acquisition element (temperature sensing unit) simultaneously collects the two types of data to form a temperature linkage monitoring of "heat transfer medium - processed workpiece", ensuring that the temperature control not only focuses on the state of the medium, but also accurately anchors the actual temperature of the workpiece. 3. The system compares the real-time collected temperature data with the preset benchmark, classifies the deviation level according to the deviation magnitude and rate, and then matches the corresponding adjustment method according to the level to achieve precise matching of "deviation degree - adjustment intensity" and avoid over-adjustment or under-adjustment.

[0019] Example 2: Supplementary explanation of the temperature bidirectional closed-loop reverse control system based on the technical content of Example 1: Including preset heat treatment temperature ranges (T1, T2) and target heat treatment temperature ranges (Tmin, Tmax), the temperature deviation value during the fine sand heating process is first calculated in the temperature bidirectional closed-loop reverse control system: ΔTs=|Ts-Tsi| and the temperature deviation value of the vehicle domain controller housing ΔTh=|Th-Thi|, where Tsi and Thi represent the median temperature values ​​during the heating process of the fine sand and the vehicle domain controller housing, respectively, which are determined according to the two temperature ranges and are used as relative constants in this invention; Furthermore, the temperature deviation rates in the fine sand and the vehicle domain controller housing are calculated based on the heat treatment runtime, such as: Vs=|Ts-Tsi| / Δt, Vh=|Th-Thi| / Δt, where Δt represents the heat treatment runtime, and Vs and Vh represent the temperature deviation rates in the fine sand and the vehicle domain controller housing, respectively. It should also be noted that: 1) The temperature deviation value is essentially the difference between two values. Although ΔTs and ΔTh are absolute values, the positive or negative value of the actual difference between ΔTs and ΔTh can be used to reflect the temperature fluctuation of the fine sand and the vehicle domain controller shell. In actual operation, the heat treatment effect is achieved by heating the fine sand and the vehicle domain controller shell simultaneously. However, the thermal conductivity of the fine sand is poor, so the heat source of the vehicle domain controller shell mainly comes from the fine sand. Therefore, there is a problem in the actual process: how to "transfer" the heat in the fine sand to the vehicle domain controller shell. The temperature fluctuation of the two can be used to reflect the actual heat treatment process. This part is the basic technical point of this invention. It is also necessary to ensure that the temperature value of the vehicle domain controller shell is always maintained within the target heat treatment temperature range (Tmin, Tmax). 2) In practice, it is also necessary to ensure that the temperature of the fine sand is maintained within the preset heat treatment temperature range (T1, T2). The key is to "transfer" the heat from the fine sand to the vehicle domain controller housing. In reality, the temperature deviation rate of the fine sand is in a negative growth state, while the temperature deviation rate of the vehicle domain controller housing is in a positive growth state. Based on the temperature deviation values, temperature deviation rates, and positive / negative growth states of the fine sand and the vehicle domain controller housing, the following judgment method is set, and preset thresholds are set according to actual production requirements, specifically including the following values: Condition 1: If the sand temperature deviation is ≤5℃, the shell temperature deviation is ≤3℃, and the temperature deviation rate is ≤0.5℃ / min, it is judged as a slight deviation. State 2: If the sand temperature deviation is 5-15℃ or the shell temperature deviation is 3-8℃, or the temperature deviation rate is 0.5-1.5℃ / min, it is judged as a moderate deviation. State 3: If the sand temperature deviation is greater than 15℃ or the shell temperature deviation is greater than 8℃, or the temperature deviation rate is greater than 1.5℃ / min, it is judged as a severe deviation. It should be briefly explained that: 5℃, 3℃, 0.5℃ / min, 5-15℃, 3-8℃, 0.5-1.5℃ / min, 15℃, 8℃, and 1.5℃ / min all represent preset thresholds, which are directly related to production parameters and are represented as constants in this invention; In the temperature regulation process, reverse control is performed based on the three states mentioned above. Theoretically, when fine sand provides a heat source to the vehicle domain controller housing, the actual temperature of the fine sand exhibits a negative increase, while the temperature of the vehicle domain controller housing exhibits a positive increase. However, the temperature deviation rate between the two can reflect the temperature stability of the vehicle domain controller housing during heat treatment. Therefore, the following settings are configured based on the three states mentioned above: Regarding State 1: The current power can be maintained without active adjustment. The temperature acquisition interval is shortened from the original 5 minutes to 3 minutes to continuously monitor the temperature change trend. If the slight deviation is maintained in 4 consecutive acquisitions, the original acquisition interval is restored. Low-frequency micro-vibration is simultaneously activated in the dense fin area to promote uniform heat transfer in the fine sand and prevent the deviation from expanding. Regarding State 2: According to the adjustment scheme of "deviation direction (high temperature to low temperature) + process stage", the heating module is controlled to linearly increase the power. The single increase is a part of the current power, such as (4.5%-7.5%), and the maximum power does not exceed 80% of the rated power to avoid local overheating of the sand body. The "small amplitude multiple adjustment" mode is adopted. After each power increase, the temperature is collected at an interval of 1 minute until the temperature fluctuation state returns to the slight deviation range. In state three, the deformation of the vehicle domain controller housing may be affected by overheating. In response to severe deviations, a stepped power increase or full-power cooling is initiated, along with a warning mechanism. After adjustment, the system performs real-time and steady-state verification to ensure that the temperature returns to the target range and remains stable. Specifically, the heating module power is immediately cut off, the cooling module is started at full power (100% rated power), the sand circulation unit is activated, pre-cooled fine sand (temperature 10-15℃ lower than the target range) is introduced to quickly balance the temperature, vibration is paused, the housing fixture is locked to prevent high-temperature deformation, and vibration is resumed after the temperature drops to a moderate deviation. Temperature data is collected every 30 seconds. If the temperature does not drop to a moderate deviation within 5 minutes, the backup cooling circuit is activated for forced cooling.

[0020] Example 3: The specific process of the overall heat treatment is described in detail below, where the temperature value is mainly limited based on the metal physical properties of the vehicle domain controller housing; Pre-treatment stage: Clean the oil stains on the surface of the shell with ultrasonic cleaning, dry it, and then put it into a special tooling to ensure that the shell and the tooling positioning reference are completely in contact; Fine sand preheating stage: The target temperature for fine sand preheating is set to approximately 480℃. The two-way closed-loop temperature control system monitors the sand temperature in real time. When the sand temperature drops below 475℃, the heating power is increased, and when it rises above 485℃, the power is reduced. Finally, the sand temperature is stabilized in the range of 480℃±3℃. Sand coating stage: First, fill the bottom and sides of the shell with fine sand, and simultaneously start the tooling vibration. Then, add fine sand to the top and fin area. After testing and high-pressure air blowing, the filling rate of the fin gaps is improved. It should also be noted that during the covering process, vibration can be applied to ensure that the fine sand is fully filled in the gaps of the fins. The key purpose is to ensure that the fine sand completely covers the shell of the vehicle domain controller. Constant temperature stage: The constant temperature duration is set to 2 hours. Initially, the temperature of the sand body and the outer shell is collected at high frequency. When the temperature difference between the two is stable within 2℃, the collection frequency is reduced. The outer shell temperature is kept stable at 478℃-482℃ throughout the process. Gradient cooling stage: In the initial stage of cooling, the temperature is reduced to 350℃ at a rate of 5℃ / min; in the middle stage, the temperature is reduced to 150℃ at a rate of 12℃ / min; and in the later stage, the temperature is reduced to room temperature at a rate of 3℃ / min. The actual cooling curve deviates from the preset curve within ±1℃ / min. Post-processing stage: After gravity sand removal and high-pressure air blowing, there are no residual sand particles on the surface of the shell, reducing the deformation of assembly dimensions and improving mechanical properties. Test results show that the shell hardness and tensile strength are improved.

[0021] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vehicular controller housing surface heat treatment process characterized by, Using fine sand as the heat transfer medium, and including the following steps: Pre-processing and tooling positioning: Clean the surface of the vehicle domain controller housing and place the cleaned housing into a special tooling; Fine sand preheating and temperature control: The fine sand is directly heated and preheated to the preset heat treatment temperature range by temperature control. Sand coating: The preheated fine sand is evenly coated on the outer shell to ensure that all parts of the outer shell and the gaps between the heat dissipation fins are filled with fine sand; Constant temperature heat treatment and temperature control: Construct a two-way closed-loop temperature control system, and monitor the temperature of fine sand and vehicle domain controller housing in real time through the two-way closed-loop temperature control system. Adjust the heating power based on the temperature feedback data to maintain the vehicle domain controller housing within the target heat treatment temperature range. Gradient cooling and temperature control: The cooling rate of fine sand is adjusted through a two-way closed-loop temperature control system, and a preset cooling gradient curve is used to drive the outer shell to cool synchronously in a gradient manner. Post-processing: Remove fine sand, clean the outer shell, and test for deformation and performance.

2. A surface heat treatment process for a vehicle area controller housing according to claim 1, wherein, The temperature control method in the fine sand preheating and temperature control step is as follows: the temperature bidirectional closed-loop reverse control system first sets the fine sand preheating target temperature according to the heat treatment process requirements of the shell material, and then obtains the actual temperature of the fine sand in real time through the temperature acquisition element. When the actual temperature is lower than the lower limit of the preheating target temperature, the temperature bidirectional closed-loop reverse control system controls the heating module to increase the heating power. When the actual temperature is higher than the upper limit of the preheating target temperature, the two-way closed-loop temperature control system reduces the heating power or stops heating until the fine sand temperature drops back to the target range. During the preheating process, the system records the fine sand temperature data once at intervals and forms a temperature change curve.

3. A vehicle area controller housing surface heat treatment process according to claim 2, wherein, In the sand coating step, a layered coating method is adopted to achieve uniform filling of the shell with fine sand: first, the bottom and side areas of the shell are initially covered with fine sand. During the coating process, a vibration device is used to slightly vibrate the special tooling. Then, fine sand is added to the top of the shell and the dense fin areas. During the addition process, the surface of the fine sand is leveled. After the coating is completed, the fine sand filling status of the fin gaps is checked by the detection element. If there are gaps that are not filled in place, high-pressure air is used to assist the flow of fine sand to fill them until all areas of the shell are completely covered with fine sand.

4. A car area controller housing surface heat treatment process according to claim 3, wherein, The operation process of the constant temperature heat treatment and temperature control step includes the following: S1: First, set the constant temperature duration according to the wall thickness and material characteristics of the vehicle domain controller shell. In the initial stage of constant temperature, the temperature bidirectional closed-loop reverse control system collects the temperature data of the fine sand and the shell. When the temperature of both is stable within the target heat treatment temperature range and the temperature difference is less than the preset threshold, it enters a stable constant temperature state. At this time, the temperature acquisition frequency is reduced. S2: If the temperature data collected during the constant temperature process deviates from the target heat treatment temperature range, first analyze the magnitude and rate of temperature deviation, and then adjust the heating power according to the deviation. When the temperature deviation is large, a stepped power adjustment method is adopted.

5. A car area controller housing surface heat treatment process according to claim 4, wherein, In the gradient cooling and temperature control step, a preset cooling gradient curve is set in stages according to the structural complexity of the shell, including the following: Initial cooling phase: A lower cooling rate is used to allow the outer casing temperature to decrease slowly; During the middle stage of cooling, once the outer casing temperature drops to the preset transition temperature, the cooling rate is increased. In the later stages of cooling, when the outer casing temperature approaches room temperature, the cooling rate is reduced again. Throughout the cooling process, the two-way closed-loop temperature control system compares the actual cooling curve with the preset curve in real time. If the deviation exceeds the allowable range, the cooling rate is corrected by adjusting the working intensity of the cooling module, so that the actual cooling process conforms to the preset curve.

6. The heat treatment process for the surface of the vehicle domain controller housing according to claim 5, characterized in that, The post-processing steps include the following: Action 1: First, tilt the outer shell by flipping the tooling, and use gravity to make most of the fine sand fall off the surface and gaps of the shell and into the sand recovery area. Action 2: Then, high-pressure airflow is used to blow away the shell surface and fin gaps to remove residual fine sand particles. During the blowing process, the airflow pressure is controlled to avoid deformation of the shell caused by the high-pressure airflow. After the second step of cleaning is completed, the deformation of the key assembly dimensions of the shell is first detected by the dimensional inspection equipment, and then the hardness, tensile strength and other performance indicators of the shell are detected by the mechanical property testing equipment. If the test results do not meet the requirements, the reasons for the deviation of the process parameters are analyzed and the subsequent heat treatment process is adjusted.

7. A heat treatment apparatus for the surface of a vehicle domain controller housing, applied in the heat treatment process for the surface of a vehicle domain controller housing as described in claim 6, characterized in that, It includes a fine sand preheating structure, a temperature detection module, a fine sand recovery structure, and a tooling assembly.

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