Wuxi YUTONG

  Quenching  tempering bar mostly work under relatively large dynamic loads. They are subjected to tension, compression, bending, torsion or shear. Some surfaces also have friction, requiring a certain degree of wear resistance and so on. In short, parts work under various complex stresses. These parts are mainly structural parts of various machines and mechanisms, such as cylinder shafts , connecting rods, bolts, gears, etc. They are widely used in machine tools, automobiles, tractors and other manufacturing industries. Especially for large parts in heavy machine manufacturing, quenching and high temperature tempering is more used. Because of the different stress conditions, the properties of conditioned parts in mechanical products are not exactly the same. Generally speaking, all kinds of quenched and tempered chrome bar should have excellent comprehensive mechanical properties, that is, proper combination of high strength and high toughness, in order to ensure the long-t...

  Skiving tube and honing tube are both two common solutions for hydraulic cylinder barrel production. Skiving and roller burnishing is a two-in-one bore sizing and finishing process that delivers high levels of precision at lightning-fast speeds. Skiving and roller burnishing process is up to 70% faster than traditional honing process , making it an ideal solution for finishing hydraulic cylinder tubes in mass-production environments. Skiving and roller burnishing tools are used for the functional production of internal diameters of cylinder tubes . These combine machining (skiving) and roughness reduction (roller burnishing) in a single tool, allowing both processes to be carried out simultaneously. Skiving tube produces the dimensional and shape accuracy required for hydraulic cylinders, for example. Roller burnishing influences the roughness of the surface directly after machining. The usual target values here are R a 0.1µm - 0.3µm. Wuxi YUTONG as a professional manufacture...

  Cylinder rod is a very important part for hydraulic cylinder, Wuxi YUTONG as a professional manufacturer of cylinder piston rod, we will have many steps to guarantee the quality of the rod, like  Inspection，grinding & peeling,cleaning & masking, and then hard chrome plating . Hard chrome plating, and then OD grinding is an excellent answer for repairing and/or providing wear resistance to parts such as cylinder shafts , rolls, hydraulic cylinders, rams, pistons and rods.   It is used in everything from plating jewellery with gold to applying reflective metal plating to satellites and spacecraft. In this process, objects to be plated are placed in a bath containing a solution of dissolved metal molecules (in our case this metal is a special Chromium formulation). Electrodes are attached to the object to be plated and a positive current is applied to the solution. As the current runs through the solution and out through the electrodes, it causes the dissol...

  SCM430 hollow rod or   4130 hollow rod   is made of   cold drawn seamless tubes   or hollowed bars, by grinding and precision polishing on the outside diameter and then chrome plated to a certain thickness on the OD. Chrome hollow bar and chrome solid bar both very popular components for producing   hydraulic cylinder . Heat Treatment Of 4130 Hollow Rod 1.Q+T(Quenched+Tempered) Quenching and tempering refers to the hardening (Quenching) of hollow rod materials at temperatures from 800 — 1,100 °C with a subsequent re-heating (Tempering) at temperatures from 540 — 680 °C. Hardening is a heat treatment process that comprises of austenitizing and rapid cooling. On account of the associated microstructure transformation during the cooling process, the chrome hollow steel rod is hard but also brittle. The subsequent high tempering temperature leads to an increased yield and tensile strength as well as to high elongation and toughness values. 2. NORMALLIZED (+N)...

  Precision cold drawn tube   is the carbon, alloy or stainless steel pipe with high precision sizes. Usually it has been made through hot rolling or cold drawn (cold rolling) processes. So precision pipe is a kind of seamless pipe.International standard for precision pipe is   DIN 2391 , which is applied with European standard.As a matter of fact, more steel pipe standard could applied for the precision pipe. Includes DIN2445, EN10305, DIN1630, DIN1629, ASTM A106, ASTM A179, JIS G3445Materials available with 10#, 20#, 35, 45, 40Cr, 25Mn. 37Mn5, St35(E235), St37.4, St45(E255),  St52(E355 ) and etc. For hot rolling precision steel pipe, tolerance of OD is +/- 0.1%.For  cold drawn precision tubes , tolerance allowed in below conditions: Diameters 6mm to 10mm, normal tolerance condition +/- 0.2%, premium tolerance condition +/- 0.15%. 10mm to 30mm, normal tolerance condition +/- 0.4%, premium tolerance condition +/- 0.2%. 30mm to 50mm, normal tolerance condition +/...

 As we all know, cold drawn steel tube is usually more expensive than the hot rolled tube, The outer diameter and wall thickness of the hot-rolled seamless steel tube is changing. The outer diameter is larger on one end and smaller on the other hand. The outer diameter and wall thickness alongside the whole steel tube is changing. This is much determined by the hot rolling production process. The process starts from round steel after the big furnace, burning to over 1080 in the round steel punch, the whole round steel is turned into a hollow tube billet. As the whole process takes some time, due to the high temperature, the OD of the pipe’s front end is larger, and wall thickness is thin. When temperature gets lower, wall thickness alongside the pipe becomes slightly thicker. And residual heat will help to calibrate the hot rolling of the tube billet, and the tube billet is rolled into the specified outer diameter. In all, the tolerance of hot-rolled seamless steel tube is rela...