Today Zhejiang Weigao Bolt Factory will explain the basic knowledge of hole processing for you.
Compared with the outer surface processing, the hole processing conditions are much worse, and the hole processing is more difficult than the outer circle processing. This is because:
1) The size of the tool used for hole processing is limited by the size of the hole to be processed, and the rigidity is poor, which is prone to bending deformation and vibration
2) When machining holes with fixed-size tools, the size of the hole is often directly dependent on the corresponding size of the tool, and the manufacturing error and wear of the tool will directly affect the machining accuracy of the hole
3) When machining holes, the cutting area is inside the workpiece, so the chip removal and heat dissipation conditions are poor, and the machining accuracy and surface quality are not easy to control.

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There are many screws made of stainless steel on the market today, among which are high-quality stainless steel materials, but it is inevitable that unscrupulous merchants have also incorporated many low-quality stainless steel products for high profits. The production of screws is checked at various levels, from design, production to inspection to packaging and transportation, all quality verifications are in place. Bolt Factory provides several methods for testing stainless steel screws.

First, the appearance of the plating layer of China Nut is directly inspected. Second, the thickness of the coating is inspected by magnetic method, microscope method, etc. Third, the adhesion strength of the coating is tested by friction polishing experiment, scratch method, thermal shock method, extrusion method and bending experiment. Finally, the corrosion resistance of the screw coating is tested by the salt spray method (neutral salt spray test, acetic acid salt spray test and immersion test,

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