论文部分内容阅读
目前一些工厂中,在裂造C及D级精度的高速钢螺丝攻时,丝攻的螺纹常加以磨制。磨裂螺纹难甚精确,但甚费钱。不经磨制而制造精确的高速钢丝攻螺纹,是本实验工作的对象。这种高度生产率的操作方法,共分二部份——滚制螺纹和高频电流淬火,业已试验成功。此项制造方法,系将螺纹滚至最终尺寸,然后在半自动高频电流装置内加热,同时防止氧化,最后在硝酸钾盐浴中进行淬火。这样制成的螺纹,具有技术条件所要求的精度及表面光洁度。本法所制丝攻与磨纹丝攻的區别,主要在于螺纹面无间隙角(Relieving)。于现行的标准丝玫相比较时,本法所制丝攻的唯一缺点就是上述这一点。
At present, in some factories, the thread of thread taps is often ground during the cracking of high-speed steel taps with class C and D precision. Grinding threads can be difficult but it is expensive. Accurate high-speed wire tapping without grinding is the object of this experiment. This highly productive method of operation, which is divided into two parts—rolled thread and high-frequency current quenching, has been successfully tested. This manufacturing method is to roll the thread to the final size and then heat it in a semi-automatic high-frequency current device while preventing oxidation, and finally quenching in a potassium nitrate salt bath. The thread made in this way has the precision and surface finish required by the technical conditions. The difference between silk attack and abrasive grain tapping produced by this Law is mainly due to the fact that there is no clearance angle (Relieving) on the thread surface. In comparison with the current standards of silk, the only drawback to wire tapping produced by this Law is this.