Hydrostatic extrusion has a history of nearly 100 years.However, in the process of large-scale and industrialization, the development speed is slowed down due to the limitation of higher strength structural materials.Advances in materials science have promoted the practical application of this technology.The use of hydrostatic extrusion technology extrusion titanium screw has outstanding advantages.In recent years, superconducting materials have been developed in the direction of cutting surface.As the continuous steepness of the guide becomes more and more demanding, the size and weight of the blank ingots are inevitably increased.In this way, the use of ordinary extrusion equipment is difficult to achieve, and the use of hydrostatic extrusion technology has more advantages.
In the process of metal processing, it is hoped that the workpiece can be in the state of three-direction compression stress, because this is conducive to plastic deformation of the metal and eliminate the surface cracks and defects of the product.In addition, it is also required to be in good lubrication state during processing to reduce the loss of function.If the hydrostatic extrusion technology can be used to meet the above two purposes.
1.Hydrostatic extrusion of titanium screws is a major obstacle to metal deformation.When hydrostatic extrusion is used, the high pressure liquid separates the blank ingot from the extrusion tube wall. At the same time, some of the high pressure liquid enters the mold hole, and the extruded product is also separated from the mold wall.Thus, the friction coefficient can be lower than 0.01, which greatly reduces the power loss and improves the accuracy of the products.
2.Increase the length of titanium screw broken ingot traditional extrusion method, 50% extrusion pressure is used to overcome the friction between the return ingot and the extrusion wall.The degree of friction is proportional to the degree of flexibility of the ingot.Therefore, the length of the ingot is limited.If hydrostatic extrusion is used, it is in a frictionless extrusion process, so the length of the ingot can be increased.For example, for a press of the same tonnage, hydrostatic extrusion yields more than three times as much as normal extrusion.