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The forging methods of titanium materials

Aug 27, 2015

Forging is the titanium metal blank (excluding plate) to exert external force, to produce plastic deformation, change the size, shape and improve performance, used to manufacture mechanical parts, workpieces, tools or blanks forming processing methods. In addition, according to the slider movement mode there are vertical and horizontal movement of the slider (for the elongated parts forging, lubrication cooling and high-speed production of parts forging) way, the use of compensation device can increase the other direction of movement. The above factors are different, the required forging force, process, material utilization, production, dimensional tolerances and lubrication cooling are not the same, these factors are also factors that affect the level of automation.

According to the movement of the blank, forging can be divided into free forging, upsetting, extrusion, die forging, closed forging, closed upsetting. Closed die forging and closed upsetting Because there is no flash, the utilization of the material is high. With a process or a few processes may be completed complex forging finishing. In the absence of a flash, the area of force for the forging is reduced and the required load is reduced. However, it should be noted that the blank can not be completely restricted, for which to strictly control the volume of blank, control the relative position of the forging die and forging measurements, efforts to reduce the forging die wear.

According to the forging mode of movement, forging can be divided into swing roll, swing forging, roll forging, cross wedge rolling, rolling ring and inclined rolling and so on. Swing roll, swing forging and rolling ring can also be used forging for processing. In order to improve the utilization of the material, roll forging and cross rolling can be used as an elongated material before the process processing. Rotary forging with free forging is also locally formed, and its advantage is that the formation of the forging force is small compared to the size of the forging. Including the free forging in this forging method, the processing of materials from the mold surface near the free surface expansion, therefore, it is difficult to ensure accuracy, so the direction of the forging die and forging process with computer control, you can use lower Of the forging force to obtain complex shapes, high precision products, such as the production of many varieties, large size turbine blades and other forgings.

In order to obtain high accuracy should pay attention to prevent the bottom dead center overload, control speed and mold position. Because these will have the impact of forgings tolerance, shape accuracy and forging die life. In addition, in order to maintain accuracy, should also pay attention to adjust the slider rail clearance, to ensure stiffness, adjust the bottom dead center and the use of auxiliary transmission and other measures.

Titanium forging materials are mainly composed of various components of pure titanium and titanium alloy, the original material of the material bar, ingot, metal powder and liquid metal. The ratio of the cross-sectional area of the metal before deformation to the cross-sectional area after deformation is called the forging ratio. Correct selection of forging ratio, reasonable heating temperature and holding time, reasonable initial forging temperature and final forging temperature, reasonable deformation and deformation speed to improve product quality and reduce costs have a great relationship. General small and medium-sized forgings are round or square bar as a blank. Bar material grain and mechanical properties of uniform, good, accurate shape and size, good surface quality, easy to organize mass production. As long as the reasonable control of heating temperature and deformation conditions, do not need a large forging deformation can be forging performance excellent forging.

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