Reliability test of automotive parts

The reliability test is a general term for tests to improve or confirm the reliability of products, devices, and parts.
Automobiles and their components are products that require high quality system management. Quality assurance and reliability have been developed for the same purpose. Reliability can be said to be at the heart of modern quality assurance.
The purpose of the reliability test:
1) to improve the design for the development of new products and to find their weaknesses;
2) Design task book for confirming products and parts;
3) To accept products and ensure product quality;
4) In order to review the reliability test such as the quality of the manufacturing process, the working conditions, that is, the loading method, environmental conditions and test time must be considered.
The reliability test is based on the different purposes of each stage of product development and production to develop its test methods and content. There are also different ways to classify reliability tests. According to the nature of the test, the reliability test can be divided into: life test, critical test, environmental test and use test.
 1) Life test:
Life test generally uses bench test and test field test. In order to shorten the test period, an accelerated life test is generally used. The accelerated life test of the gantry in the laboratory is easy to obtain good test results due to stable test conditions. There are destructive tests and non-destructive tests in the bench life test. A destructive test involves investing a certain number of samples in a life test under specified conditions to record the time at which the sample has failed. These failure times are the basis for statistical analysis of life. The non-destructive test is generally a reliability test on small parts and high-priced important parts, and the timing censoring test is generally used.
 2) Critical test
During the use of the car, some components will encounter the maximum stress, so to ensure its safety, it should also be tested. In order to further find the weakness as a safety component, a mandatory failure test is carried out, and destructive stress is applied to ensure sufficient strength when the maximum stress occurs in actual use. For example, sharp turns, emergency braking, quick start, etc., seem to be very harsh under normal use conditions and are generally considered to be possible in actual use, and thus it is used to confirm the reliability test.
3) Environmental test vehicles As an international commodity, the output location is expanding. Therefore, it is required to carry out use tests that are not available in domestic environmental conditions, such as salt damage, temperature resistance, and corrosion resistance tests.
The environmental conditions for storing cars in the market often change, so how to master and formulate measures to ensure the reliability of cars and parts is also a very important task in the future.

Electronic Manufacturing Services (EMS) Information

Electronic manufacturing services (EMS) are provided by companies that design, assemble, produce, and test electronic components and printed circuit board (PCB) assemblies for original equipment manufacturers (OEMs).printed circuit board assembly

EMS companies may provide a variety of manufacturing services, including design, assembly, and testing. EMS companies may be contracted at various points in the manufacturing process. Some companies require only a design file from the customer before proceeding to develop the product, source the components from a trusted distributor, and assemble and test the product. Alternatively, electronic manufacturing service providers who specialize in assembly may require the customer to provide the design, the components necessary for manufacturing, and an assembled sample. EMS companies may provide additional onsite services, such as PCB etching, or provide these services through another contractor.

Electronic manufacturing involves different levels of automation, depending on the company and project. Companies that produce large runs of products typically use heavily automated manufacturing. Providers who specialize in prototypes or small production runs typically assemble PCBs manually to save the time and cost involved in setting up automated assembly equipment.

Various types of compression springs design process

Installation space: the design of compression springs must be clearly understood, the need to install the spring space, can effectively grasp the basic manufacturing conditions of a compression spring, diameter, diameter, free long.

Activity stroke load: compression spring design, you must clearly understand the location to be activated, and the required load of the elastic. Determine the required elasticity, you can determine the material, diameter, laps.

Environmental factors: spring in different environments, will be affected by environmental factors, and affect the service life, so the designer must take into account the changes in ambient temperature and humidity, the temperature of the spring life of a huge impact, humidity is easy to make Unperforated springs produce oxidation. So the environmental factors can determine whether the spring for the surface treatment and material selection.

Both ends of the distance from the space: the end of the tension spring will affect the hook and the form of the extension of the long free. Space can determine the size of the close, outside diameter.

Pre-pull the load: pre-pull the load is to determine the spring material and diameter, the size of the Department can be adjusted pre-pull length.

The outer diameter of the mandrel: the inner diameter of the torsion spring is determined by the size of the mandrel, but only after the change of the spring, the appropriate margin is reserved.

The internal diameter of the installation space: if the torsion of the spring device into the embedded type need to consider the embedded space. The space determines the outer diameter of the spring, the length of the length, the number of turns.

Torsion fulcrum: torsion spring work must have a point, this one point can determine the length and form of torsion bar.

Action from the end: force torsion bar in the absence of power and the angle of the fulcrum position, can be set out the force of the length of the torsion bar, the form and the angle with the fulcrum.