This paper introduced two methods for determination of mar resistance of paint film in ISO standards and ASTM standards,which use curved stylus and pointed stylus respectively.
介绍了ISO标准和ASTM标准中漆膜耐划伤性的两种测试方法,即用弧形划针测定漆膜耐划伤性和用尖顶划针测定漆膜耐划伤性的原理、仪器设备、测试步骤和结果表示等内容。
This paper analyses that tip angle of drill bit influences on cutting capability and life of twist drill, when the material and shape of work piece is different.
分析了工件材料、形状不同时 ,钻尖顶角的大小对麻花钻切削性能及寿命的影响 ,介绍了麻花钻的钻尖顶角的选择 。