The purpose of the thermal shock test is the thermal shock test

The thermal shock test chamber is used to test the degree to which a material structure or composite material can withstand a continuous environment of high and low temperature in an instant. As a high-precision, high-efficiency environmental test equipment, the thermal shock test chamber is relatively cumbersome to troubleshoot and solve due to the complexity of its own system and process. The main faults and troubleshooting methods of the thermal shock test chamber:

1.Control interface display: three-phase power supply phase sequence error checking mode:

1. Is the part of the three-phase power supply phase sequence error fault displayed in the red indicator light not flashing state?2. Is the part of the three-phase power supply phase sequence error fault displayed in the flashing state of the red indicator light?Solution:

1. This situation usually occurs when the equipment is positioned or moved for the first time, and two of the three lines of the three-phase power supply can be reversed

In fact, as a tool, the thermal shock test chamber is used for different purposes at different stages of product development:

1. The engineering development stage can be used to find product design and process defects;

2. Provide a basis for product finalization or design appraisal and acceptance decision-making in the batch production stage;

3. When used as an environmental stress screening application, the purpose is to eliminate the early failure of the product.

Therefore, when compiling the environmental test outline or screening outline, test report or screening report at different stages of the development process, the test purpose of the thermal shock test should be concretized, and it is not appropriate to express vague or general.

Proficiency testing for thermal shock testing refers to verifying the accuracy and reliability of thermal shock testing equipment. In general, proficiency testing for thermal shock testing requires the following steps:

Preparation of Leakage Mode Standards: A common standard specimen is selected to verify the accuracy of the test equipment.

Set the test conditions: set the test parameters, such as the temperature, time, number of cycles, etc.

Perform a thermal shock test: Use test equipment to perform a thermal shock test.

Compare test results: Compare the results obtained from the test with the standard results to evaluate the accuracy of the test equipment.

Make an evaluation: According to the comparison results, judge whether the test equipment meets the requirements. If not, adjustments and maintenance are required.

Through the above steps, the accuracy and reliability of the thermal shock testing equipment can be verified, thus ensuring the reliability of the test results.

How to purchase a thermal shock test chamber principle that meets your requirements, carefully consider the following factors:

User requirements, including any requirements for product testing: consider the environmental conditions under which the test must be carried out, such as high temperature, low temperature, and humidity conditions, and a test process is constant temperature and humidity, which should still be carried out under various temperature and humidity conditions; What precautions should be taken when testing the product, such as the product will volatilize ** or flammable gases at high temperatures, so if you want to perform high temperature testing, you must choose an explosion-proof test chamber.

Understanding the principle of a thermal shock chamber is the only way to make a better choice.

What is the test volume of the test volume? This can be determined by the volume, quantity, and shape of the product you want to test;

The minimum and maximum weight of the test chamber you need can be determined based on the total amount of the minimum and minimum samples and the total weight of the maximum sample;

What is the temperature and humidity range you require?

What are the installation conditions, such as the installation location; how the test chamber is transported indoors; Whether it is fixed or removable. Test if there will be hazardous substances, then whether your laboratory has an emission treatment facility; Whether the power supply is sufficient, whether the water source is available, some test rooms also need to provide pure water, so the pure water facilities are installed in **, how to connect; wastewater discharge; The impact of the test on indoor environmental noise, etc.;

These are the most basic considerations.

Although the general thermal shock test standard does not mention or does not make a mandatory provision for the starting temperature of the thermal shock test, this is a problem that must be considered when the test is carried out, because it involves whether the test ends in a low temperature or high temperature state, which determines whether the product needs to be dried, resulting in a longer test time.

If the test is completed after the low-temperature standard test product is taken out of the cold and thermal shock test chamber (chamber), it should be recovered under normal test atmospheric conditions until the sample arrives at a stable temperature, which will inevitably cause condensation on the surface of the test sample to introduce the influence of temperature on the product. Thus changing the nature of the test.

In the GBJ 150 implementation guide, in order to eliminate this effect and avoid long-term recovery and prolong the test implementation time, the sample can be recovered in a high-temperature chamber of 50 °C, and then the temperature stability can be reached at room temperature after the condensation dries. In the implementation guide, it is proposed that the initial impact temperature can be changed to start the test from a low temperature, so that the test results can avoid condensation in the cold and thermal shock test chamber of the product at high temperature. The two test methods make the test sample undergo six extreme temperatures (three high temperatures, three low temperatures) and five temperature shock processes, but the number of different impact directions is different, and the test effect that these two tests may achieve is basically the same, but the latter test method does not need to add drying time, and shortens the cold and hot shock test time.

1. The lower limit of 1h is stipulated, that is, if the temperature stability time is less than 1h, 1h must be required; If it is greater than 1 hour, the time greater than 1 hour is used;

2. The 5 time grades from 10min to 3h are given, and the product temperature stability time measured by the thermoshock test chamber is used in the same table, and the time closest to it or the optional time grade is adopted, and the time closest to it is directly used as the holding time;

In the f-method, there is no specific time or optional time level, and the time when the product reaches temperature stability or the real exposure time of the product in the environment is directly used.

In the temperature shock test, the most important thing is to establish the stress caused by the inconsistency of thermal expansion and contraction of different materials. The actual thermal shock is most likely to occur on the outside of the tested product, and the relevant data points out that it is not necessary to achieve the temperature stability of the whole product, but as long as the temperature of the tested product is consistent with the test temperature. Although there is some truth in this opinion, it is also difficult to implement, because it is impossible to install many sensors on the surface of the product, and the heat transfer capacity of each part of the product is inconsistent, and the heat capacity of the adjacent parts inside the tested product is also inconsistent, so it is difficult to determine.

The thermal shock test chamber is a necessary testing equipment for metal, plastic, rubber, electronics and other material industries, which is used to test the material structure or composite materials, which can be endured in an instantaneous continuous environment of extremely high temperature and extremely low temperature, so as to detect the chemical changes or physical injuries caused by thermal expansion and contraction of the test sample in the shortest time. The test method satisfies the cold and hot shock test chamber: GB high and low temperature impact test.

The high and low temperature impact test chamber is the temperature shock test chamber and the cold and hot shock test chamber, which are mainly for the adaptability test of electrical and electronic products, as well as their original components and other materials in the environment of rapid temperature changes. It is mainly used for environmental simulation tests on the physical and other related characteristics of the product in accordance with the requirements of national military standards or user-defined requirements, under the conditions of instantaneous changes in high temperature and low temperature, and after testing, through testing, to judge the performance of the product, whether it can still meet the predetermined requirements, so as to be used for product design, improvement, identification and factory inspection.

You: You need to pay attention to the main configuration (compressor, relay, etc.) and the impact temperature (important).

Hizhe environmental test equipment team, your answer.

The thermal shock test chamber developed by the laboratory can be used to test the degree to which the material structure or composite material can withstand in an instantaneous continuous environment of extremely high temperature and extremely low temperature, so as to test the chemical changes or physical damage caused by thermal expansion and contraction in the shortest time. The applicable objects include metal, plastic, rubber, electronic and other materials, which can be used as the basis or reference for the improvement of its products.