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High Strength Clinch Clips Has Some Problems
- Sep 08, 2017 -

High strength Clinch Clips has some problems
      With the development and progress, the quality of its industrial demand is also higher and higher, so the requirements of Clinch Clips is also rising, high-strength Clinch Clips to meet everyone's needs, at present, high-strength Clinch Clips good prospects for development, but a domestic Some companies produce high-strength Clinch Clips or there are some problems, according to understand, mainly the following major problems.
      First, the size of ultra-poor. Clinch Clips is a common component, interchangeability requirements are higher, the size of the tolerance will directly affect its interchangeability, and even affect the connection strength, anti-loose performance or life. The main reason for the size of the failure of the process is improperly controlled, In order to save some of the size control in the vicinity of the lower limit, the production process is not timely adjustment of equipment, the use of ultra-poor die: Second, poor inspection, process inspection and factory inspection is not strict, so that some unqualified pass; The gauges can not be regularly tested and even use gauges that exceed the wear limits.
      Second, the hardness is not qualified. Hardness is also an important indicator of the mechanical properties of Clinch Clips. The material used in each grade grade product is different. Clinch Clips is an important basis for mechanical performance grade. It is necessary to determine the working load and installation according to the performance level during installation and use. Torque, for a specific material, the hardness should be controlled at a reasonable level, high hardness may reduce the product's fatigue resistance, some companies in order to improve product strength, hardness control at a higher level, resulting in some products exceeded.
      Third, to ensure that the load, wedge load failed. Ensure that the load and wedge load are the key items of the mechanical properties of the product under the action of tensile load, which is especially important for high strength Clinch Clips. To ensure that the load is assessed under the provisions of the tensile load under the product resistance to plastic deformation, if the index does not meet the requirements, due to the role of preload and work load, may produce plastic deformation, thereby reducing the preload, The Wedge load test is to assess the tensile strength of the bolt product and the head of the joint strength, the indicators failed, in the larger working load, especially under the impact of the impact or support surface by partial load, the fracture or U-turn, resulting in connection failure, and even security incidents.
      Fourth, decarburization layer exceeded. Decarburization is also a Class A project. Due to decarburization, the surface hardness and strength of the parts are greatly reduced. The surface contact strength and fatigue life of Clinch Clips are particularly prominent for the thread parts. The main reason for decarburization is decarburization of raw materials, decarburization during decontamination of materials and decarburization during heat treatment.
     For large sizes of Clinch Clips are often used in aqueous polymer quenching, quenching with alkaline cleaning agent to clean and rinse, quenched Clinch Clips has been rusted in the inside. Analysis of the infrared spectrometer to confirm that in addition to iron oxide, there are sodium, potassium and sulfur, indicating Clinch Clips inside the adhesive alkaline cleaning agent, is likely to be potassium hydroxide, sodium carbonate or similar substances, to promote its rust. Check for Clinch Clips rinsing for excessive contamination and also recommend frequent rinsing water. In addition, adding rust inhibitor to water is also a good way.
 Clinch Clips after the tempering signs of discoloration, soaked with ether, so that ether volatile and found that the remaining oily residue, such substances are high levels of lipids. Indicating that Clinch Clips was polluted by the cleaning agent and quenched oil during the rinsing period, melted at the heat treatment temperature, leaving chemical scars, and such substances confirmed that Clinch Clips was not clean. It is analyzed by infrared spectrometer and is a mixture of base oil and ether in quenched oil. The ether may come from the addition of the quenching oil. The results of the quenching oil analysis in the mesh belt furnace show that Clinch Clips is slightly oxidized in the quenching oil due to unreasonable stacking during heating, but it is almost negligible. This phenomenon is related to the cleaning process rather than quenching oil The

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