With the development of science and technology, the test equipment has developed to the stage of intelligence, virtualization, networking and miniaturization, and has the characteristics of high precision and high efficiency, and will continue to develop along this trend. According to various environmental conditions and combined with testing equipment, this paper will briefly describe the method and equipment selection of routine environmental test equipment box for components.
Environmental test equipment refers to the test box dedicated to simulating and reproducing the natural environment of various ambient temperatures and humidity, which can be freely controlled and adjusted by the automatic programmable controller to realize the function of different temperature and humidity conversion or greenhouse humidity maintenance! Its name can be called environmental test chamber, environmental test instrument, environmental simulation test machine, etc. it is mainly used in electronics, military industry, metal manufacturing industry and communication equipment industry to test the physical and chemical properties of its products!
Environmental experimental equipment can be divided into the following categories according to its service performance and application industry:
Constant temperature and humidity experimental equipment:
It is mainly used for the test of temperature and humidity retention. It can freely set the environmental change conditions such as high temperature and high humidity, low temperature and high humidity, high temperature and low humidity, low temperature and low humidity. It is widely used in the performance of temperature and humidity resistance and humidity resistance of products in various electronic, communication equipment and other industries!
High and low temperature alternating test equipment:
It is mainly used for high-temperature and low-temperature performance test. It can freely set environmental conditions such as high temperature or low temperature of minus 40 ℃. It is widely used in high-temperature and low-temperature performance test of products in military enterprises and electrical communication industry!
High and low temperature alternating damp heat test chamber:
It is applicable to the performance and reliability test of automotive non-metallic materials, interior and exterior trim parts and electronic and electrical products. It has a large control range of temperature. In the application of equipment, select the temperature and humidity controllable range that meets the "basic environmental test procedures for electrical and electronic products", so as to carry out environmental tests such as high temperature, low temperature and damp heat alternation of electronic products or materials.
Cold and hot shock experimental equipment:
It is mainly used for the cold and hot impact performance test of products. It can freely set the high temperature and low temperature to realize the instantaneous impact test performance of minus 30 ℃ and high temperature of 80 ℃ within 5 minutes. It is widely used in the cold and hot impact performance test of products in automobile manufacturing and electronic communication equipment manufacturing!
Light resistance and aging laboratory:
Light resistance and aging resistance test is a fast and effective simulated environment test, which can partially replace the long natural environment exposure test and evaluate the aging resistance of materials and parts more quickly than the natural environment test. The artificial light source test equipment simulating sunlight is used to accelerate the aging of the tested parts. For example, xenon lamp aging test box is selected, the environment in the box simulates sunlight, and the light and weather resistance test of automotive interior and exterior decoration materials can be carried out, which can realize irradiance control and closed-loop automatic point control, and test the light stability, color fastness and light resistance of the materials, At the same time, the damage caused by on-line full spectrum and rainwater is compared and assessed according to the product design standard.
Using fluorescent ultraviolet lamp as light source, the accelerated weather resistance test of automotive interior and exterior decoration materials was carried out by simulating environmental conditions such as ultraviolet, rain, high temperature, high humidity, condensation and darkness. The ozone aging test chamber is used to study the action law of ozone on rubber. By simulating and strengthening the ozone conditions in the atmosphere, the anti ozone aging performance of rubber can be quickly identified and evaluated. Cold and heat shock and temperature and humidity test.
For high temperature and thermal aging tests of various plastics, rubber and other non-metallic materials, body accessories and electrical and electronic products, high temperature constant temperature test chamber is selected, which belongs to climate simulation chamber. Through the test, we can understand the high temperature resistance of automobile parts, such as the thermal aging performance of rubber and plastic parts on the automobile, the heat resistance performance of body accessories and electronic products, and test the parameters and performance of automobile interior and exterior decoration materials and electrical parts after the change of temperature environment in high temperature and constant temperature test. It is an important part of quality control of automobile parts.
Sealing performance test:
For the waterproof performance test of the shell of lamps and harness, the box rain test box is selected to simulate the rain environment to test the waterproof performance of automobile lamps, wiper waterproof strips and low-voltage electrical appliance shell.
Flame retardant test:
For the horizontal combustion test of automobile seat fabric and interior plastic parts, the interior and exterior decoration combustion test machine is selected to test the flame retardant performance of the material under the direct combustion of the specified fire source. The test evaluation standard adopts GB8410-2006 combustion characteristics of automotive interior materials.
The sand and dust test is used to test the dust resistance of parts. By simulating the natural wind and sand climate, the destructiveness of parts to automotive electrical parts is tested. Refer to the box size, temperature controllable range, humidity requirements, dust concentration, differential pressure and other parameters to select a suitable sand and dust test box.
Salt spray (cyclic) corrosion test:
Testing the corrosion resistance of automotive metal and non-metallic materials can be divided into neutral salt spray test, copper accelerated acetic acid salt spray test and cyclic corrosion test. As an accelerated corrosion test method to evaluate the anti-corrosion performance of steel protective coating, neutral salt spray test has been widely used as a test method to evaluate the corrosion resistance of automobile parts at this stage.
Because it is impossible to simulate the dry state conditions and the alternating state of dry and wet in the atmospheric natural environment, and it is impossible to really simulate the corrosion in the outdoor natural state, the failure state of actual automobile parts in use is often different from the results of neutral salt spray test.
Copper accelerated acetic acid salt spray test is an accelerated corrosion test method for evaluating Decorative Electrodeposited coatings such as "copper + nickel + chromium". The cyclic corrosion test is more close to the corrosion condition in the outdoor natural state, and the assessment is more accurate. The main influencing factors include corrosive medium, spray, wet heat cycle and drying cycle. Through different combinations and cycles, the different corrosion processes of automobile parts in the atmospheric environment are simulated. Before the test, the coated auto parts shall be scribed.
The advantage of using the salt spray (cyclic) corrosion test chamber is that the sample can be exposed to a series of different salt spray corrosion conditions by using the repeated cycle to test the corrosion resistance of automotive metal materials. At present, many advanced automobile manufacturing companies in the world take the cyclic corrosion test method as an approved method to evaluate the corrosion resistance of automobile parts.
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