How to choose the positioning method of stamping and drawing dies?
- Blocking pin
The function of the stopper pin is to use the strip to overlap or punch the outline to limit the feeding distance of the strip. There are three common types of stopper pins in national standards: fixed stopper pins, movable stopper pins, and initial stopper pins. The fixed stopper pin can be easily installed on the bottom die and can be used to control the feeding distance of the strip. It features simple structure and convenient processing. Because it is installed on the die, the mounting hole may also weaken the strength of the die, and the commonly used structures have similar circular and hook-shaped retaining pins. Active stop pins are often used in flip-chip composite molds. The start stop pin is used to start positioning in the progressive die.
Second, the guide pin
Guide pins are often used in conjunction with stop pins in progressive dies to minimize positioning errors and ensure the relative position dimensional accuracy requirements of holes and shapes. When there is no hole suitable for the guide pin on the part, for the progressive die with too many processing steps and high part accuracy requirements, process holes should be set in the vacancies on both sides of the strip to guide the pin. Use straightening strips. At this time, the guide pin is fixed on the punch fixing plate or the elastic pressure stripper.
Three, side edge
In the progressive die, the side edge is often used to control the step distance of the strip, so as to achieve the purpose of accurate positioning. The side edge is actually a punch for cutting edge material, using the edges on both sides of the side edge to cut off the material on both sides of the strip to form a step. After the strip is cut off part of the edge material, the width can continue to be fed to the die, and the feeding distance is the cut length. When the material is sent to the step formed after cutting, the side edge stopper prevents the material from continuing to feed, and a new feeding step can be formed only after the next work of the mold.
Fourth, the positioning plate and positioning nails
Positioning plates and positioning pins are all components used for positioning a single blank to ensure the relative position accuracy of the front and rear processes or the position accuracy requirements of the inner hole and outer contour of the workpiece.
5. Control of feeding direction
The feeding direction of the strips is the guide plate with the strips on the side, and the feeding is guided along the designed feeding direction to make the strips close to the guide plate on one side to ensure the accuracy of the feeding, and a side pressure device can be used. Since the stamping and drawing die adopts the cover-shaped semi-finished product that is drawn out of the sheet for the first time, the material can be positioned by the blank holder in the die.
The editor added: The correct position must be accurately guaranteed by relying on its own positioning parts. Due to the different forms of blanks and the different structures of the stamping and drawing dies used, there are many types of positioning parts. The design should be selected according to the form of the blank, the structure of the stamping and drawing die, the tolerance of the parts, and the production efficiency.
Through the above introduction, let’s briefly introduce that we have a good understanding of the positioning of the stamping and drawing die, and the selection of its positioning method is selected according to the positioning parts, which I hope we can understand.
