传统门板中部插件为获得柔软效果,通常采用手工包覆及低压注塑工艺。手工包覆工序繁杂、不环保;低压注塑工艺面料利用率低,同时需要低压注塑设备,设备投入大。针对以上2种工艺的缺点,开发了面料尺寸与制件大小相当,且使用常压注塑机预...传统门板中部插件为获得柔软效果,通常采用手工包覆及低压注塑工艺。手工包覆工序繁杂、不环保;低压注塑工艺面料利用率低,同时需要低压注塑设备,设备投入大。针对以上2种工艺的缺点,开发了面料尺寸与制件大小相当,且使用常压注塑机预裁软质小面料常压合模注塑技术(Precutting small soft skin close mould technology,PC3S)制备门板中部插件。介绍了PC3S工艺的注塑模具材质要求和模具结构特点。实践表明,该工艺可以制备手感与传统手工包覆相似的软化效果的门板中部插件,生产成本大大降低,且生产工艺节能环保。展开更多
Titanium carbonitride based composite （TiCN-metallic binder） was developed as die material for replacement of cemented tungsten carbide. The effects of thermal conductivity characteristic of the TiCN composite on ho...Titanium carbonitride based composite （TiCN-metallic binder） was developed as die material for replacement of cemented tungsten carbide. The effects of thermal conductivity characteristic of the TiCN composite on hot forging performances were investigated using a servo press with ram motion control. Three types of the die materials; （a） tool steel for hot working, （b） cemented tungsten carbide with high thermal conductivity and （c） TiCN composite with low thermal conductivity were compared. In hot upsetting of a chrome steel workpiece, the TiCN composite die was confirmed to reduce the forging load by approximately 20% at slow forging speed. This is because the die with low thermal conductivity could prevent the workpiece from rapid cooling induced by heat transfer at the die-workpiece interface. In addition, the material flow of the workpiece to a die cavity was improved. Furthermore, the wear depth/wear coefficient of the TiCN composite was lower than that of the tool steel and the cemented tungsten carbide in the numerical analysis of wear due to the combination of low thermal conductivity and high hardness.展开更多
文摘传统门板中部插件为获得柔软效果,通常采用手工包覆及低压注塑工艺。手工包覆工序繁杂、不环保;低压注塑工艺面料利用率低,同时需要低压注塑设备,设备投入大。针对以上2种工艺的缺点,开发了面料尺寸与制件大小相当,且使用常压注塑机预裁软质小面料常压合模注塑技术(Precutting small soft skin close mould technology,PC3S)制备门板中部插件。介绍了PC3S工艺的注塑模具材质要求和模具结构特点。实践表明,该工艺可以制备手感与传统手工包覆相似的软化效果的门板中部插件,生产成本大大降低,且生产工艺节能环保。
文摘Titanium carbonitride based composite （TiCN-metallic binder） was developed as die material for replacement of cemented tungsten carbide. The effects of thermal conductivity characteristic of the TiCN composite on hot forging performances were investigated using a servo press with ram motion control. Three types of the die materials; （a） tool steel for hot working, （b） cemented tungsten carbide with high thermal conductivity and （c） TiCN composite with low thermal conductivity were compared. In hot upsetting of a chrome steel workpiece, the TiCN composite die was confirmed to reduce the forging load by approximately 20% at slow forging speed. This is because the die with low thermal conductivity could prevent the workpiece from rapid cooling induced by heat transfer at the die-workpiece interface. In addition, the material flow of the workpiece to a die cavity was improved. Furthermore, the wear depth/wear coefficient of the TiCN composite was lower than that of the tool steel and the cemented tungsten carbide in the numerical analysis of wear due to the combination of low thermal conductivity and high hardness.
