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化学汽相沉积碳化钛和氮化钛能显著减轻工模具的磨损,成倍甚至数十倍地延长使用寿命,已广泛应用于硬质合金刀具与工模具。目前该工艺正逐步扩大用于一部分高速钢和合金工具钢制的刀具和模具,例如切边模、冲头、滚齿刀、螺纹轧制工具、管子锥、钻头与模具镶套等。为使工具钢工模具得到满意的冶金质量和尺寸精度,必须合理选择涂覆和热处理工艺。因为化学汽相沉积的温度高,一般在975～1050℃之间,将使钢基体软化,事故后需热处理获得足以支承高硬涂层的强度。涂覆过程通常有±0.03毫米的尺寸变形,加上热处理变形,可能导致工模具尺寸超过公差范围。美国科学涂层公司(SCI)通过合理制定工艺和采用真空热处理,在保证冶金性能的前提下,可使工具钢工模具工作面的尺寸控制在涂覆公差范围内,定位面精加工后达到图纸规定尺寸。该公司的专用工艺路线为:1)材料在软态下
Chemical vapor deposition of titanium carbide and titanium nitride can significantly reduce tool wear, doubling or even tens of times to extend the service life, has been widely used in carbide cutting tools and tooling. Currently, the process is gradually expanding to include tools and dies for part of high-speed steel and alloy tool steel such as trimming dies, punches, hobs, thread rolling tools, pipe cones, drill bits and die inserts. In order to obtain satisfactory metallurgical quality and dimensional accuracy of tool steel molds, the coating and heat treatment processes must be rationally selected. Because of the high temperature of chemical vapor deposition, usually between 975 ~ 1050 ℃, will make the steel matrix softening, heat treatment after the accident was sufficient to support high-strength hard coating strength. The coating process usually has a dimensional distortion of ± 0.03 mm, which, combined with heat treatment, can lead to over-dimensioning of the tooling. American Scientific Coatings Corporation (SCI) through the rational development of technology and the use of vacuum heat treatment, to ensure the premise of the metallurgical properties, the size of the tooling steel working surface can be controlled within the scope of the coating tolerance, the positioning surface after finishing the drawings Specified size. The company’s special route for the process: 1) The material in the soft state