Wuxi YUTONG

  Skiving and roller burnishing   process provide high quality  hydraulic cylinders  with final sizing and creates the desired finish pattern on the interior of tubing or cylinder bores. They are used in the manufacturing of hydraulic cylinders. Compared to  honing  process, they are 80-90% saving of machine time which reduces tool costs per meter of tube length and produces super finish surface, with a bore tolerance of H8, thereby reduces the sealing wear making it ideal for pistons. It is capable of holding bore diameter tolerances to 0.025 mm (0.001 in.) The necessary equipment requires a large up-front investment, which makes it suitable for high-volume tubing production. The skiving and roller-burnishing operation, as the name implies, actually involves two processes in one tool. The tube is end clamped in the machine and the tool advances inside. Coolant is pumped through the ID of the tube, flows around the tool and pushes chips out of the front of ...

   ST37.4 Cold Drawn Hydraulic Tube   is made in accordance to DIN 2391 / DIN 2445. It also called as seamless precision steel tube. ST37.4 steel tubes have a NBK finishing, where tubes are normalized, phospated, and oiled inside and outside.    ST37.4 Hydraulic steel tubes are measured by Outer Diameter (OD) and varies tube thickness (THK). Difference of OD and tube thickness will lead to different working pressure.  THE ADVANTAGES OF ST37.4 COLD DRAWN HYDRAULIC TUBE DIN highly accurate,  cold drawn seamless tube  and bright seamless hydraulic tubes is used as the tube to be phosphated. The phosphated is realized with the imported chemical fluid to form a black film. The antirust oil is absorbed by means of the micropore on the film to prevent from the rust. The caps are covered at two ends of tube to prevent from the dust. High accuracy, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high c...