Quality inspection of automotive fasteners

Quality inspection of automotive fasteners

Fasteners are small, but their role should not be ignored. If you want to analyze the role of fasteners, this is not only part of the problem but also the whole and part of the relationship between the philosophical issues. As we all know, an independent screw, if you do not use it, can only be placed aside to be ignored, but for airplanes flying in the sky or on the ground running cars, trains, etc., screws are indispensable. Once the screws are loose or lost, and then the precision of the machine can not operate normally and even cause tragedy. Undeniably, due to the tragedy caused by the screws, the person in charge of the machine can not be blamed, but to a certain extent, it is closely related to the quality of the screws themselves.

Bolts in the car have a large number of applications, from wheel bolts, engine bolts, connecting rod bolts, and cylinder head bolts, from ordinary standard parts to 1 2.9 level of high-strength bolts. They are used to fasten a variety of automotive moving parts and joints to withstand large stresses.

The standard quality problems of our automobile fasteners are as follows.

1. Unqualified size and thread

Fasteners are general-purpose parts, and interchangeability requirements are high. Size deviation will directly affect interchangeability and even affect the connection strength, anti-loosening performance, or life. Thread is an important indicator of the effective fastening force of fasteners.

2. Unqualified hardness

Hardness is also an important indicator to assess the mechanical properties of fasteners, fasteners in the installation and use by the performance level to determine the working load and installation torque, so the performance of different materials for different fasteners to control the hardness of the product at a reasonable level. High hardness can reduce the fatigue resistance of the product, so for some companies, to improve the strength of the product, the hardness of the fastener will be controlled at a high level so that part of the product's hardness exceeds the standard.

3. Excessive decarburization layer

The decarburization layer is the primary assessment of the quality of fasteners; decarburization reduces surface hardness and strength of parts significantly, seriously affecting the surface contact strength and fatigue life of fasteners, especially on the threaded parts of the harm is m prominent. Decarburization is mainly due to improper control of the heat treatment process or backward heat treatment equipment, resulting in surface carbon loss.

China's fastener industry has good product quality and strict quality accident prevention, and implementing zero-defect management may be a good way to achieve this. Zero-defect management of fasteners is a new management concept and a new challenge.

The zero defects management model consists of the following four basic principles.

First, quality must meet the objective requirements of customers and markets, and the true meaning of quality is integrity, not just "goodness."

Second, a quality assurance system is about prevention, not inspection, and eliminating the causes of errors before they occur. Inspection and aftercare can be prevented through training, education, role modeling, and leadership and must be continuously monitored and measured by senior leadership.

Third, getting things right the first time must be achieved by training employees and providing resources such as time and equipment to achieve compliance.

Fourth, quality standards will be paid for if they are not met.

The intent of zero defects emphasizes a determination and a mentality, an uncompromising attitude that is manifested in never letting go of any small quality problem, finding the cause and solving it completely, and preventing the problem from occurring with the most positive, conscientious, and prudent attitude.

Prevent the occurrence of problems is the highest state of quality management, the result is that the enterprise's products meet the user's requirements, that is, no defects in the product, which is "zero defects" management to achieve the ultimate goal. A fastener enterprise only pursues zero defects, with their efforts to minimize losses to achieve the "3N" process quality control objectives: do not accept defective products, do not produce defective products, and do not transfer faulty products. To achieve the process quality control goal of "zero defective product flow rate."

Alloy Steel Flanged Button Head Screws： Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws. They have a flange that distributes pressure across a wide surface, eliminating the need for a separate washer. Head height includes the flange. Length is measured from under the flange.

Black-oxide alloy steel screws are mildly corrosion-resistant in dry environments.

Zinc-plated alloy steel screws resist corrosion in wet environments.

Stainless Steel Ultra-Wide Flanged Button Head Screws： Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. The flange is broader and thicker than our other flanged screws, so they distribute pressure the best. Head height includes the flange. Length is measured from under the flange.

Metric Stainless Steel Thread-Locking Button Head Hex Drive Screws： These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. A nylon patch bonded to the threads adds friction to prevent loosening from vibration. Length is measured from under the head.

Metric Sealing Stainless Steel Tamper-Resistant Button Head Torx Screws： To prevent unwanted removal, these metric screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them challenging to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt. It’s Buna-N rubber, which withstands wet and abrasive environments. Made of 18-8 stainless steel, these screws have good corrosion resistance and may be mildly magnetic. All are passivated for added protection against corrosion.

Alloy Steel Tamper-Resistant Button Head Hex Drive Screws： Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws. They have a black-oxide finish that provides mild corrosion resistance in dry environments. Their tamper-resistant hex drive (a pin-in hex drive) makes them challenging to remove without special tools. For installation tools, see tamper-resistant hex drivers and bits. Length is measured from under the head.

At present, China's infrastructure construction is being carried out as fire as tea, including high-speed railroads. Many high-tech projects have been launched, especially the rapid development of the automotive industry. These fasteners to China's enterprises have brought a huge market. At the same time, the quality of its products has also put forward higher requirements. For example, fasteners used in automobiles need to implement more stringent quality standards. Each batch of fasteners should undergo a strict sampling test and various mechanical tests before leaving the factory.

Finally

In conclusion, pursuing high efficiency, strong toughness, and lightweight combination is still the essence of automotive fastener steel and manufacturing; metal materials science will play a restraining role. Safeguarding the safety of automotive fasteners, with the current fight against the proliferation of various types of counterfeit and shoddy products, can only highlight the key points, comprehensive management, and the actual critical fasteners screened and labeled, but also must be resolved. In recent years, China's new energy, automobiles, electronic appliances, high-speed rail, and several critical industries have seen rapid growth; fastener enterprises have also encountered a "ride" on the fast line of opportunity. Therefore, fastener enterprises should pay attention to improving the quality of products, can not simply pursue a price war as a means of competition, should adjust the structure of the fastener industry, eliminating backward fastener enterprises, to achieve the adjustment of the industrial structure, to continuously improve product quality, and promote the upgrading of the industry.

In summary, the material selection of automotive fasteners and safety measures is important to ensure the safety of automobile driving. Consider the material characteristics, installation and maintenance, design calculations, and other aspects to ensure the overall safety and reliability of the car!

For high-quality Alloy Steel Tamper-Resistant Button Head Hex Drive Screws and professional technical support, please get in touch with us at adelajonly@gmail.com or visit our website at https://www.juxinfasteners.com.