The principle of multi-station progressive die layout design

① Make the unfolding blank template (3~5) of the stamping parts first, repeat the trial layout on the drawing, and after the preliminary plan is determined, arrange the punching, cutting, scrap cutting and other separation stations at the beginning of the layout drawing, and then Arrange the forming station to the other end in turn, and finally arrange the workpiece and the carrier to separate. When arranging the working position, try to avoid punching a small half hole to prevent the punch from breaking due to uneven force.　　②The first station is generally arranged with punching and punching process pilot holes. The second station is equipped with a guide pin to guide the tape material. In the subsequent stations, the guide pin is set according to the number of stations and the stations that are prone to movement. It can also be set at every other station in the future. 2~3 stations are equipped with guide pins. The third station can be equipped with an error detection device for the feeding step according to the positioning accuracy of the stamping strip.　　③When the number of holes on the stamping parts is large, and the positions of the holes are too close, the holes can be punched out in different positions, but the holes cannot be deformed due to the influence of the subsequent forming process. For porous holes with relative position accuracy requirements, synchronous punching should be considered. When the die cannot be punched out simultaneously due to the limitation of the die strength, measures should be taken to ensure their relative position accuracy. The complex hole can be broken down into a number of simple holes and punched out step by step.　　④The choice of forming direction (up or down) should be conducive to the design and manufacture of the mold, and is conducive to the smooth feeding of materials. If the forming direction is different from the punching direction, mechanisms such as oblique sliders, levers and pendulum blocks can be used to change the forming direction.　　⑤In order to improve the strength of the die insert, discharge plate and fixed plate, and ensure that the installation positions of the formed parts do not interfere, empty stations can be set in the layout, and the number of empty stations is determined according to the requirements of the mold structure.　　⑥For bending and deep drawing forming parts, the degree of deformation of each station should not be too large, and stamping parts with larger deformation degree can be formed several times. This is not only conducive to quality assurance, but also conducive to mold debugging and trimming. For forming parts with high precision requirements, a shaping station should be set. In order to avoid the stretching of the material in the deformation zone of the U-shaped bending part, it should be considered to bend 45 degrees first, and then bend to 90 degrees.　　⑦In the progressive deep drawing layout, techniques such as deep drawing front notch and grooving can be applied to facilitate the flow of materials.　　⑧ When there are local compression ribs, it should generally be arranged before punching to prevent the deformation of the hole due to the compression ribs. When protruding the bag, if there is a hole in the center of the protruding bag, in order to facilitate the flow of the material, a small hole can be punched first, and then punched to the required aperture after the protrusion. ⑨When there are not many progressive forming stations and the precision requirements of the workpiece are high, the 'reset' technology can be used, that is, the blank of the workpiece is punched along its prescribed contour before the forming station, but not with the belt. The material is separated. When the punch cuts 20% to 35% of the material, the reset mechanism in the mold will act on the reverse force to press the cut workpiece back into the strip, and then send it to the subsequent processing station for forming.