Nickel plated double head screws, ultra short double head bolts, anti-corrosion and rust proof surface treatment

The drawing process has two purposes: one is to modify the size of raw materials; The second is to achieve basic mechanical properties of fasteners through deformation strengthening. For medium carbon steel and medium carbon alloy steel, there is another purpose, which is to make the sheet like cementite obtained after controlled cooling of the wire rod break as much as possible during the drawing process, preparing for the subsequent spheroidization (softening) annealing to obtain granular cementite. However, some manufacturers arbitrarily reduce the drawing passes to reduce costs, Excessive reduction in surface area increases the tendency of work hardening of wire rods, directly affecting the cold heading performance of wire rods. If the reduction rate distribution of each pass is not appropriate, it can also cause torsional cracks in the wire rod during the drawing process, which are distributed along the longitudinal direction of the wire and have a certain period of exposure during the cold heading process of the wire. In addition, poor lubrication during the drawing process can also cause regular transverse cracks in the cold drawn wire rod. The tangential direction of the wire rod when it is rolled up from the grain mold mouth is not concentric with the drawing die, which can cause increased wear of the single side hole of the drawing die, causing the inner hole to be out of circle, resulting in uneven drawing deformation in the circumferential direction of the wire, causing the roundness of the wire to exceed the tolerance, and uneven stress on the cross section of the wire during cold heading, which affects the qualification rate of cold heading. During the drawing process of wire rod steel wires, excessive partial reduction rate deteriorates the surface quality of the wire, while low reduction rate is not conducive to the fragmentation of flake cementite, making it difficult to obtain as much granular cementite as possible. That is, the spheroidization rate of cementite is low, which is extremely detrimental to the cold heading performance of the wire. For rod and wire rod steel wires produced by drawing, the partial reduction rate is controlled within the range of 10% -15%.

Yue Luo, a riveting nut riveting fixture, relates to a fixture, specifically a riveting nut riveting fixture. [Background Technology] In order to quickly press riveting nuts and quickly switch between different specifications and properties of riveting nuts, and ensure the riveting strength between the riveting nuts and the parts during the riveting process, a riveting fixture is required. In order to overcome the shortcomings of existing technology, Yueluo provides a riveting fixture that can improve riveting strength and switch riveting for different specifications and properties of riveting nuts.

Countersunk, semi countersunk, 1200 countersunk, and semi countersunk rivets are mainly used in riveting situations where the surface needs to be smooth and the load is not significant. Flat headed rivets are used for riveting applications under general loads. Flat head and round head rivets are mainly used for riveting metal sheets or non-metallic materials such as leather, canvas, and wood. Large flat head rivets are mainly used for riveting non-metallic materials. Half hollow rivets are mainly used for riveting occasions with low load. Headless rivets are mainly used for riveting non-metallic materials. Hollow rivets have a light weight and weak head, and are used for riveting non-metallic materials with low load. Tubular rivets are used for non loaded riveting of non-metallic materials. Label rivets are mainly used for riveting nameplates on machines, equipment, etc.

Screw, also known as "Screw" (screw) or "screw" (screw rod). In fact, screws are a general term, while screws and screw rods are different from each other. Screws are generally called wooden screws; It is the type with a pointed front end and a larger pitch, commonly used for fastening wooden and plastic parts. A screw rod is a machine screw (mechanical screw) with a flat front end, a small and uniform pitch, and is generally used to fasten metal and machine components.

Pins are frequently used parts in the mechanical industry, especially in the mold manufacturing industry. With the development of the mold industry, the precision of mold manufacturing and assembly is becoming higher and higher, and people are increasingly pursuing high-quality and close to the mold. Every detail on the mold is constantly being improved, and the high-frequency use of pins forces people to find safer, simpler, and more reliable ways to disassemble and assemble.