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Threaded joints are widely used in aircraft, automobiles, various mechanical structures, looseness of threaded joints, bolt breakage and rust of internal Screw holes, and sliding teeth seriously affect the reliability of various linked structural workpieces. Can effectively solve this problem.
The wire screw sleeve is simply referred to as a wire sleeve, which is made of high-strength, high-precision, low surface roughness and corrosion-resistant diamond-shaped stainless steel wire, which is shaped like a Spring. Screwed into a special enlarged special screw hole, the outer surface of the wire sleeve is closely attached to the inner screw hole by elastic force, and the inner surface forms a standard internal thread. When the screw (bolt) is matched, the thread joint strength can be obviously improved. And the wear resistance, forming an elastic joint, eliminating the pitch and the half-angle error between the internal and external threads, so that the load on the thread is evenly distributed. Due to the action of the wire sleeve, the force distribution along the length of the thread is relatively uniform, and the first to second thread stresses of the thread near the section are greatly reduced, thereby avoiding the bolt being broken and the screw hole of the screw hole being worn away, thereby causing an accident.
The experiment proves that the load of the first thread of the common threaded joint is higher than that of the threaded joint of the threaded sleeve, which is 40% to 50% higher for the aluminum shell and 70% to 75% for the steel shell. After the wire sleeve is used, the first few thread loads are reduced, the latter thread loads are increased, and the transmission can be continued.
The wire sleeve is formed by cold rolling of the extremely hard stainless steel wire 1Cr18Ni9Ti, so that the torque generated by the friction on the screw is reduced by 90%, so that the maximum pre-tightening torque and the screw tension can be obtained with the minimum tightening torque to prevent The screw is loose, and at the same time, the use of the wire sleeve at high temperature can reduce the thermal stress of the part and prevent the threaded connection from being stuck or scratched.
After using the wire sleeve, the screw with smaller size and higher strength can be selected under the same strength condition as the ordinary internal thread, so that the material can be saved in a large amount, the weight is reduced and the volume is reduced.
The wire sleeve can also be used as a repairing means to quickly and effectively repair the original shape in the event of threading error or internal thread tripping or disordered teeth. The performance is much better than the thread formed by the original tapping thread. In addition, the use of silk sleeves for meter and inch conversion is very convenient and fast. 
Because silk sleeves have many excellent characteristics, high strength, wear resistance, impact resistance, vibration resistance, flexibility and elasticity, some countries have made great progress in the application of silk sleeves. For example, the Spey engine produced by Luo Luo Company in the United Kingdom, in the modified MK202 machine, each screw hole is fully loaded into the wire sleeve to protect the screw hole of the housing. In the aerospace industry, aluminum and magnesium alloy materials are commonly used. In the past, in order to strengthen the screw holes of aluminum and magnesium alloy casings, special bushings with internal and external threads were used in the casing, and the bushings and casings were highly precise. The interference is difficult to assemble the bushing and the casing. The use of the wire sleeve not only solves the problem of precision threading and assembly, but also makes the structure lighter and the performance is superior.
The wire sleeve has the following advantages in the threaded connection:
(1) The wire sleeve is firmly fixed in the screw hole of the housing according to its own elastic force, and no other fixing measures are needed.
(2) Simple operation, convenient installation, fast and economical.
(3) The wire sleeve is wound by a precision stainless steel wire, and there is no positional deviation between the internal and external threads, such as displacement and verticality, which improves the position accuracy of the screw hole.
(4) Small size, light weight and compact structure.
(5) Protect the screw hole, repeatedly install and remove the thread, and it will not be damaged, and the effect is good.
(6) In the threaded connection, the distribution of the load along the length of the thread can be improved, thereby improving the stress distribution of the bolt, and resisting impact and vibration, improving the fatigue strength of the threaded joint, and improving the tensile strength on the basis of the original. More than 80%.
(7) The surface of the silk sleeve is smooth and the friction coefficient is small.
(8) High production efficiency, saving raw materials, suitable for specialized centralized production.
(9) Repairing the screw hole is simple and convenient, no need to change any other structure, and no repair marks can be seen.
(10) It can improve the sealing degree of the joint surface.
(11) It can be operated in the field without power.
(12) The same specification, the thickness of the teeth can be converted after using the wire sleeve.
(13) Simplify the structure, simplify the process, and reduce the variety of parts.
The locking type wire sleeve is a new type developed on the basis of the ordinary type of wire sleeve. The middle part of the locking type wire sleeve has pentagon or hexagonal shape of 1 to 2 turns. When the bolt is screwed into the screw hole half, The bolt head hits the locking ring. At this time, it needs to be screwed in with the tool. The bolt expands the hexagon of the wire sleeve. Conversely, the hexagonal shape catches the middle diameter of the bolt and plays a locking role. . Practice has proved that it is superior to other common locking devices in locking performance and can be repeatedly disassembled.
At present, foreign silk sleeve technology has been widely used in aerospace, aviation, shipbuilding, weapons, optical instruments, radio, locomotives, automobiles and other industries.