One-shot die in the special screw manufacturing process for the stability of the quality and value of the use of finished products, such as the most important, from the straight line diameter of the wire by a die first extrusion stable ratio, in order to make the second punching correct, so cross or a Words or plum blossoms, etc., extend the lifespan to achieve the purpose of use.
Special screws
A die usually uses a movable die. The advantage is that the length of the wire needed at the head is all fed into a die and the spring is used to press the die face against the head die face. The punch die moves in a punch sleeve. , Extruding the shape of the front end of a punch die from the strands of the strands, rushing back, the spring pressing a die to the normal position, can prevent bending or wrinkles, the parallel extrusion of the strands makes the fiber flow lines normal, and can avoid worry about broken punches The filter. A punch die diameter design can not be too large, such a result after the second punch molding special screw head type delamination, head type will be more than one layer of wrinkles. The diameter of a punch die must not be too small or the center is unstable. Sometimes the left hand is sometimes twisted to the right, and the special screw cross punch is easily broken and difficult to adjust.