Flexible Hydraulic Cold Drawn Pipe Technology Research And Draft Design

At present, the production of high precision thin-walled tube was used much more extensively than before. However, many products were made by the machining method, which is high cost and low efficiency, According to the intersection principle of plastic and hydraulic forming, it is very important to find a new forming mechanism about the precision hydraumatic flexible cold drawing tubing and get a technology about drawing tube.Based on the predecessor studies and the technology of designing cold drawing die,a new cold drawing die,which is combining the features of cold drawing and hydraumatic technology, was designed.And there are some big oil groove inside of the new die.The special hydraulic oil is put into oil groove through the hydraulic system,the special hydraulic oil as the stress medium is infiltrated between tube-blank and die, the oil pressure cavity, the oil membrane will be get. Then the tube will be drawn under certain speed, the interactive deformation phase between die and work-piece was transmitted by the oil membrane.The stress state and deformation process of tube has been analyzed under high-pressure medium, and get the parameters among liquid pressure, the tube deformation and the die parameters, and the parameters of hydraulic oil press was defined. The strain state is simulated with the MARC software, which gets the distribution of stress and strain The new way to calculate draw press under the new drawing die was got, which combines normal way and hydraulic oil press Through combining the theory and, experiment data and simulation, get the verification of new drawing die and the new method of drawing press.