Screws are widely used in electrical products, precision machinery, toys, plastics (related things: plastics), etc., with corrosion resistance, wear resistance, high hardness, tight structure, good, small pores, strong separation with the matrix metal, adhesive force ( The interfacial area between the adhesive and the bonded object is good, spreads evenly and has a certain thickness. Electrical screws are "quantity products" and are not hand-made artworks. In mass production, they are aimed at achieving high-precision, stable quality and consumer prices. How to test the quality of screws?
1. Screws can be measured with a vernier caliper, which is a lightweight, screw-on insert that is placed in a bulk wall to withstand the screws that fix the accessory;
2, the microscope inspection, microscopy called gold, it is through the (tōng guò) fastener erosion corrosion, put forward using micrometer microscopy microscope magnification, coating thickness measurement section;
3, the use of qualified screws, structural design, if there are gaps, may cause easy to produce surface deposition of geometric conditions;
4, check the head of the screw, there is head eccentric, gimmick, head is not round or full, flashing phenomenon, so do not buy.
Mechanical production is a very cautious process (guò chéng), and the responsibility to be undertaken is also very important. Even a small screw cannot be ignored. It is respect for life and responsibility for society. . Custom screws have an important task in the industry, as long as there is industry on the earth, the function of the screw is always important. Screws are a common invention in people's life and production for thousands of years. According to the application field, it is the largest invention of mankind. Non-standard screws utilize the physics and mathematics of the object's bevel circular rotation and friction, and progressively fasten the tool's tools. Screws are a common term for fasteners, spoken daily.