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U-JIN Tech Corp. is a South Korean manufacturer of
AluStir''U-Jin: Friction Welding Machines - Friction Welded Products.''
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U-JIN Tech Corp. is a South Korean manufacturer of friction welding
Friction welding (FRW) is a solid-state welding process that generates heat through mechanical friction between workpieces in relative motion to one another, with the addition of a lateral force called "upset" to plastically displace and fuse the m ...
machines and automated manufacturing cells
Cellular manufacturing is a process of manufacturing which is a subsection of just-in-time manufacturing and lean manufacturing encompassing group technology. The goal of cellular manufacturing is to move as quickly as possible, make a wide variet ...
.
History
U-JIN Tech Corp. was founded in February 2009. It stablished its own R&D center within the Korea Industrial Technology Association (KOITA
Kitta or Koita ( el, Κοίτα) is a village in the Mani peninsula, Laconia, Greece. It is part of the municipal unit of Oitylo. It is built on top of a hill, overlooking the sea. Kitta is known for its many Maniot pyrgoi (war towers). Partial ...
) in 2010. The R&D center has the objective to develop new products.
U-Jin has initially developed and manufactured hydraulic friction welding machines, and it built Korea's first CNC friction welding machine in 2012.
In 2015 the company was recognized as ''Contributor for Development of Excellent Capital Goods'' by the Minister of Trade, Industry, and Energy. In November 2016 it received the European CE Certificate and started exporting machines to Europe. On Trade Day in December 2016, it received the ''10 Million Dollar Export Tower Award''.
Friction welding machines
CNC technology is used by U-JIN Tech Corp both for automatic material transport and in cases where high accuracy is required. Due to the position measuring devices known from CNC milling machines, the length tolerance of the components can be maintained more accurately than with conventional hydraulic machines. It is even possible, to bring the spindle to a standstill in a given position so that the two eyes of a drive shaft can be positioned at an angle to each other. The two spindles of U-JIN's computer numerical controlled double-head friction welding machines are driven by servo motors that allow the angular position of their motor shaft to be controlled, as well as the speed of rotation and acceleration, since they are equipped with position sensors. If the spindles are controlled in the same way as CNC-controlledservo motor
A servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also ...
s, angular accuracies of ±0.5° can be achieved, e.g. at both ends of a cardan shaft
A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power (physics), power and torque and rotation, usually ...
.
Friction welded products
As friction welding operates below the melting point of the materials, even dissimilar material joints can be produced with high tensile strength. In many cases, the tensile strength of the bimetallic joint is higher than that of the softer base material. U-JIN's friction welding machines are used industrially for a wide variety of products: *Gear shafts made ofchrome-molybdenum steel
41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common ...
*Electric terminals and cable lugs made of pure copper and pure aluminum
*Long screws and bolts made of structural or high-speed steel
*Stainless steel and aluminum adapters for refrigerants or coolants in superconductors
*Shaft-hub connections in hollow shafts for the drive train of cars
* Carbon steel (Advanced High Strength Steel, AHSS) and stainless steel pump shafts
*Transition pieces in carbon steel S25C and stainless steel SUS304 (tensile strength 443 N/mm²)
*Transition pieces made of carbon steel S45C and stainless steel SUS304 (tensile strength 639 N/mm²)
*Motor shafts made of structural and stainless steel/ref>
References