Ingot casting and fire uniformizing process for heat dissipation aluminum alloy plate for automobile power battery constant-temperature cooling system

Abstract

The invention discloses a cast ingot fire uniformizing process for a heat dissipation aluminum alloy plate for an automobile power battery constant-temperature cooling system. The cast ingot fire uniformizing process comprises the following steps that S1, a cast ingot is preheated; s2, heating with uniform fire; s3, heat preservation treatment; step S4, slowly cooling; step S5, carrying out post-treatment; according to the flame uniformizing process, the flame uniformizing effect and performance of the cast ingot are effectively improved by optimizing process parameters, especially by adopting measures such as segmented heating, cast ingot rotation and slow cooling; compared with the prior art, the process not only improves the temperature uniformity of the cast ingot, but also reduces the risk of internal stress and cracks, so that the quality of the heat dissipation aluminum alloy plate is improved, and the high-performance requirement of a new energy automobile power battery cooling system on a heat dissipation material is met; the preheating treatment step is added before the fire uniformizing treatment, so that the internal and external temperatures of the cast ingot are uniform, the thermal stress in the subsequent fire uniformizing process is reduced, and the performance stability of the cast ingot is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy processing, and in particular relates to a casting tempering process for heat dissipating aluminum alloy aluminum plates used in a constant temperature cooling system of an automobile power battery. Background Art

[0002] With the popularity of electric vehicles, the performance and safety of power batteries have become the focus of industry attention. Batteries generate a lot of heat during the charging and discharging process. If the heat cannot be dissipated in a timely and effective manner, it will seriously affect the service life and safety of the battery. Aluminum alloys are widely used in the heat dissipation system of automotive power batteries due to their excellent thermal conductivity and good mechanical properties. The ingot equalization process is an important link in the production of high-performance aluminum alloy aluminum plates, but the existing process has problems such as uneven equalization and low efficiency, which makes it difficult to meet the production needs of high-performance heat-dissipating aluminum alloy aluminum plates. In addition, during the preparation process of aluminum alloy ingots, due to uneven cooling rates and other reasons, there are often problems such as high internal stress and uneven structure, which affect the heat dissipation effect.

[0003] Based on this, a casting equalization process for heat dissipation aluminum alloy aluminum plate used in the constant temperature cooling system of automobile power batteries is designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a casting annealing process for heat dissipating aluminum alloy aluminum plates for automotive power battery constant temperature cooling systems, which effectively solves the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: a casting tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system, comprising the following steps:

[0006] Step S1: Preheating the ingot

[0007] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0008] S1.2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 300℃-400℃;

[0009] S1.3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1-2 hours.

[0010] Step S2: uniform heating

[0011] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 500-600°C.

[0012] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0013] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1-2 revolutions per minute during the equalizing process to ensure that the ingot is evenly heated;

[0014] S2.4, the equalization time is 4-6 hours;

[0015] Step S3: heat preservation treatment

[0016] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 4-6 hours to homogenize the internal structure of the ingot.

[0017] Step S4: Slow cooling

[0018] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0019] S4.2. Control the cooling rate at 5-15℃ / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0020] Step S5: Post-processing

[0021] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0022] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0023] Preferably, in S1.3, the heating rate is 5-10°C / min.

[0024] Preferably, in S2.2, the heating rate is 15-20°C / min.

[0025] Preferably, in S3.1, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0026] Preferably, in S5.1, the surface cleaning of the ingot is performed by mechanical cleaning or chemical cleaning.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The uniform annealing process of the present invention effectively improves the uniform annealing effect and performance of the ingot by optimizing process parameters, particularly adopting measures such as staged heating, ingot rotation, and slow cooling. Compared with the existing technology, this process not only improves the temperature uniformity of the ingot, but also reduces the risk of internal stress and cracks, thereby improving the quality of the heat dissipation aluminum alloy aluminum plate and meeting the high performance requirements of the heat dissipation material for the power battery cooling system of new energy vehicles.

[0029] Adding a preheating step before the equalizing treatment makes the temperature inside and outside the ingot uniform, reduces the thermal stress in the subsequent equalizing treatment, and improves the performance stability of the ingot;

[0030] The present invention accurately controls the cooling rate, thereby avoiding the adverse effects of excessively fast or slow cooling rates on ingot performance. DETAILED DESCRIPTION

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] The present invention provides a tempering process for an ingot of heat-dissipating aluminum alloy aluminum plate for a constant-temperature cooling system of an automobile power battery, comprising the following steps:

[0033] Step S1: Preheating the ingot

[0034] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0035] S1.2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 300℃-400℃;

[0036] S1.3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1-2 hours.

[0037] Step S2: uniform heating

[0038] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 500-600°C.

[0039] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0040] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1-2 revolutions per minute during the equalizing process to ensure that the ingot is evenly heated;

[0041] S2.4, the equalization time is 4-6 hours;

[0042] Step S3: heat preservation treatment

[0043] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 4-6 hours to homogenize the internal structure of the ingot.

[0044] Step S4: Slow cooling

[0045] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0046] S4.2. Control the cooling rate at 5-15℃ / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0047] Step S5: Post-processing

[0048] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0049] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0050] In S1.3 of this embodiment, the heating rate is 5-10°C / min.

[0051] In S2.2 of this embodiment, the heating rate is 15-20°C / min.

[0052] In S3.1 of this embodiment, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0053] In S5.1 of this embodiment, the surface of the ingot is cleaned by mechanical cleaning or chemical cleaning.

[0054] Example 1:

[0055] A casting tempering process for heat dissipation aluminum alloy aluminum plate for a constant temperature cooling system of an automobile power battery comprises the following steps:

[0056] Step S1: Preheating the ingot

[0057] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0058] S1.2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 300°C;

[0059] S1.3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1 hour.

[0060] Step S2: uniform heating

[0061] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 500°C.

[0062] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0063] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1 rpm during the equalizing process to ensure that the ingot is evenly heated;

[0064] S2.4, the equalization time is 4 hours;

[0065] Step S3: heat preservation treatment

[0066] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 4 hours to homogenize the internal structure of the ingot.

[0067] Step S4: Slow cooling

[0068] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0069] S4.2. The cooling rate is controlled at 5°C / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0070] Step S5: Post-processing

[0071] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0072] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0073] In S1.3 of this embodiment, the heating rate is 5°C / min.

[0074] In S2.2 of this embodiment, the heating rate is 15°C / min.

[0075] In S3.1 of this embodiment, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0076] In S5.1 of this embodiment, the surface of the ingot is cleaned by mechanical cleaning or chemical cleaning.

[0077] Example 2:

[0078] A casting tempering process for heat dissipation aluminum alloy aluminum plate for a constant temperature cooling system of an automobile power battery comprises the following steps:

[0079] Step S1: Preheating the ingot

[0080] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0081] S1.2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 400°C;

[0082] S1.3, heat the ingot to the preheating temperature at a slow heating rate, the preheating time is 2 hours; step S2, uniform heating

[0083] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 600°C.

[0084] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0085] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1-2 revolutions per minute during the equalizing process to ensure that the ingot is evenly heated;

[0086] S2.4, the equalization time is 6 hours;

[0087] Step S3: heat preservation treatment

[0088] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 6 hours to homogenize the internal structure of the ingot.

[0089] Step S4: Slow cooling

[0090] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0091] S4.2. Control the cooling rate at 15°C / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0092] Step S5: Post-processing

[0093] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0094] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0095] In S1.3 of this embodiment, the heating rate is 10°C / min.

[0096] In S2.2 of this embodiment, the heating rate is 20°C / min.

[0097] In S3.1 of this embodiment, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0098] In S5.1 of this embodiment, the surface of the ingot is cleaned by mechanical cleaning or chemical cleaning.

[0099] Example 3:

[0100] A casting tempering process for heat dissipation aluminum alloy aluminum plate for a constant temperature cooling system of an automobile power battery comprises the following steps:

[0101] Step S1: Preheating the ingot

[0102] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0103] S1.2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 350°C;

[0104] S1.3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1.5 hours.

[0105] Step S2: uniform heating

[0106] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 550°C.

[0107] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0108] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1.5 rpm during the equalizing process to ensure that the ingot is evenly heated;

[0109] S2.4, the equalization time is 5 hours;

[0110] Step S3: heat preservation treatment

[0111] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 5 hours to homogenize the internal structure of the ingot.

[0112] Step S4: Slow cooling

[0113] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0114] S4.2. Control the cooling rate at 10°C / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0115] Step S5: Post-processing

[0116] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0117] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0118] In S1.3 of this embodiment, the heating rate is 7.5°C / min.

[0119] In S2.2 of this embodiment, the heating rate is 17.5°C / min.

[0120] In S3.1 of this embodiment, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0121] In S5.1 of this embodiment, the surface of the ingot is cleaned by mechanical cleaning or chemical cleaning.

[0122] Example 4:

[0123] A casting tempering process for heat dissipation aluminum alloy aluminum plate for a constant temperature cooling system of an automobile power battery comprises the following steps:

[0124] Step S1: Preheating the ingot

[0125] S1.1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer.

[0126] S1.2. Close the preheating furnace door, start the heating system, and set the preheating furnace temperature to 330°C;

[0127] S1.3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1.2 hours.

[0128] Step S2: uniform heating

[0129] S2.1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 530°C.

[0130] S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached;

[0131] S2.3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1.2 rpm during the equalizing process to ensure that the ingot is evenly heated;

[0132] S2.4, the equalization time is 4.5 hours;

[0133] Step S3: heat preservation treatment

[0134] S3.1. When the ingot reaches the equalizing temperature, maintain the temperature for 4.5 hours to homogenize the internal structure of the ingot.

[0135] Step S4: Slow cooling

[0136] S4.1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature;

[0137] S4.2. The cooling rate is controlled at 7°C / min to reduce the generation of internal stress and ensure the quality of the ingot;

[0138] Step S5: Post-processing

[0139] S5.1. Clean the surface of the cooled ingot to remove the oxide scale and impurities.

[0140] S5.2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

[0141] In S1.3 of this embodiment, the heating rate is 6°C / min.

[0142] In S2.2 of this embodiment, the heating rate is 16°C / min.

[0143] In S3.1 of this embodiment, during the heat preservation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

[0144] In S5.1 of this embodiment, the surface of the ingot is cleaned by mechanical cleaning or chemical cleaning.

[0145] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0146] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A casting tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system, characterized in that: The following steps are involved: Step S1: Preheating the ingot S1.

1. Place the aluminum alloy ingots to be tempered on the brackets of the preheating furnace, ensuring that there is sufficient spacing between the ingots to allow for even heat transfer. S1.

2. Close the preheating furnace door, start the heating system, and set the temperature of the preheating furnace to 300℃-400℃; S1.

3. Heat the ingot to the preheating temperature at a slow heating rate. The preheating time is 1-2 hours. Step S2: uniform heating S2.

1. Place the preheated ingot into a soaking furnace, and set the soaking furnace temperature to 500-600°C. S2.2, adopt the method of staged heating, with a faster heating rate, until the set temperature is reached; S2.

3. Install a rotating device in the equalizing furnace to rotate the ingot slowly at a speed of 1-2 revolutions per minute during the equalizing process to ensure that the ingot is evenly heated; S2.4, the equalization time is 4-6 hours; Step S3: heat preservation treatment S3.

1. When the ingot reaches the equalizing temperature, maintain the temperature for 4-6 hours to homogenize the internal structure of the ingot. Step S4: Slow cooling S4.

1. After the insulation is completed, turn off the heating system and place the ingot in a cooling medium for cooling, slowly cooling it to room temperature; S4.

2. Control the cooling rate at 5-15℃ / min to reduce the generation of internal stress and ensure the quality of the ingot; Step S5: Post-processing S5.

1. Clean the surface of the cooled ingot to remove the oxide scale and impurities. S5.

2. Conduct quality inspection on the ingots to check whether there are defects such as cracks and deformation on the surface of the ingots. At the same time, check whether the internal structure of the ingots is uniform, ensure that there are no defects such as oxide scale and cracks on the surface of the ingots, ensure the quality of the ingots, and meet the requirements of subsequent processing and use.

2. The ingot tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system according to claim 1 is characterized in that: In the step S1.3, the heating rate is 5-10°C / min.

3. The ingot tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system according to claim 1 is characterized in that: In the step S2.2, the heating rate is 15-20°C / min.

4. The ingot tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system according to claim 1, characterized in that: In S3.1, during the insulation process, the temperature in the furnace is continuously monitored to ensure that the temperature fluctuation does not exceed ±5°C.

5. The ingot tempering process for heat dissipation aluminum alloy aluminum plate for automobile power battery constant temperature cooling system according to claim 1, characterized in that: In S5.1, the surface cleaning of the ingot is performed by mechanical cleaning or chemical cleaning.