Straight rebar connection sleeve mechanical technology, although each has certain advantages, but, in varying degrees, each also has some shortcomings, such as sleeve cold extrusion technology is used to connect high-pressure pumps for the power source, by squeezing will connect the sleeve along the radial pressing, plastic deformation of the sleeve, and steel mesh with each other, forming a whole to transmit force. . Steel sleeve must be applied when connecting with a certain tightening torque to ensure the quality of the connection, if prone to slip after workers inadvertently screw is not tight, reinforced by force, taper thread bottom diameter smaller than the diameter of the base circle reinforced base materials, joint strength will be weakened impact of joint performance, although neutral taper threaded connection is good, but the more stringent requirements for steel, steel horseshoe-shaped incision can not be bent or otherwise easy to produce threaded insufficiency, connection quality to stay hidden. Therefore, the site should be managed more stringent requirements; upsetting straight thread connection technology is horseshoe-shaped steel cut ends first, and then the steel reinforcement bar header ends upsetting, threading machine with a straight thread cutting into it straight thread, to be joined together by steel butt straight thread sleeve. Upsetting straight thread connection process is not only cumbersome, upsetting the steel head microstructure changes, without tempering, will produce stress concentration, reduced ductility, to improve the joint force is unfavorable; rolling straight thread connection technology is straight thread rolling machine to roll into a straight rebar ends, then two straight thread sleeve will be reinforced butt together. Due to the ends by roll forming steel, reinforced by cold material handling, thread and steel strength has increased to make up for the impact of steel threaded bottom diameter smaller than the diameter of the base material of the base circle on the strength weaken brought to achieve equal strength steel connection. Features of this technology is less processing operations, high bonding strength, easy construction, etc., due to the greater tolerance rolled steel itself, silk head processing quality control difficult, rolling wheel force harsh conditions, low working life; stripping rib rolling straight thread connection technology is to connect technology to overcome rolling straight thread connection technology defects appear, this technology overcomes the shortcomings of the above-mentioned several connectivity technology has been widely applied www.chinataotong.com