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由于钛合金冷成形性能差、回弹大、不容易贴模、容易出现裂纹等现象,所以一般稍复杂形状的弯曲件、成形件都需要采用热成形。电阻加热成形是热成形方法之一。下面介绍斯贝发动机两种钛合金零件采用该工艺的情况。一、零件形状及技术要求零件材料为T/Cu,属钛、铜二元合金,含铜量为2.5％;厚度1.2毫米;成形后厚度允许变薄至0.94毫米,零件型面在以基本形状为中心的±0.51公差带内;5处焊接边要求较高,见图1。
Due to the poor cold forming properties of titanium alloy, large rebound, not easy to paste the mold, prone to cracks and so on, so the general shape of the slightly curved parts, forming parts require the use of thermoforming. Resistance thermoforming is one of the hot forming methods. The following describes the Spey engine two titanium parts using the process. Part shape and technical requirements Part material is T / Cu, titanium, copper binary alloy, copper content of 2.5%; thickness of 1.2 mm; forming thickness to allow thinning to 0.94 mm, the part surface in the basic shape As the center of the ± 0.51 tolerance band; 5 welding requirements are higher, see Figure 1.