Progressive die

◆ Progressive die, also known as: multi-station progressive die, continuous die, skip die, it is in a pair of die, according to the workpiece to be processed into several equidistant stations, set on each station One or several basic stamping processes to complete the processing of a certain part of the stamped workpiece. The material to be processed is processed into strips of a certain width in advance, and a certain feeding method is adopted, and one step is fed at a time. After punching one by one, a complete punching workpiece is obtained. In ten progressive dies, blanking, bending, deep drawing, forming and other processes can be completed continuously. Generally speaking, no matter how complex the shape of the stamped parts and how many stamping processes are, they can be stamped with a pair of progressive dies.

◆ The materials used for progressive die are long strips. When the material is thick and the production batch is small, it can be cut into strips; when the production batch is large, the coil material should be selected. The coil material can be automatically fed and automatically received, but it can be punched automatically with a high-speed punch. The eleven-step progressive die has strict requirements on the thickness and width of the material. If the width is too large, the strip cannot enter the guide plate of the mold or the passage is not smooth; if the width is too small, it will affect the positioning accuracy, and it is easy to damage the side edges, punches and other parts.

Progressive model point

◆ 1) Improve labor productivity and equipment utilization. Some complex small parts are almost impossible to produce without the use of progressive dies. ◆2) Improve production efficiency and reduce costs. It also has the distinguishing feature of operational safety. ◆3) The use of progressive die is also subject to certain restrictions: the size of the workpiece, the workpiece is too large, the number of kings is large, and the mold is large. At this time, the matching of the mold and the punching table should be considered. Since the progressive die needs to use strip material, the workpiece with complex shape will generate more waste, so pay attention to the material utilization rate when selecting the progressive die. Generally, the utilization rate of progressive die materials is low. Generally, the workpiece produced by progressive die has low precision.

Step distance and fixed distance method

The basic size of the step is the center distance between two adjacent stations. The center distance of any two adjacent stations of the progressive die must be equal. For single-arrangement layout, the layout is equal to the sum of the outer contour size of the punched part and the overlap margin. The size of the overlap value can refer to the overlap value of the punching layout.

◆ The way of fixed distance:

◆ 1. Gauge pin spacing: It is suitable for simple progressive die for manual feeding, and uses the waste hole after blanking of the workpiece and the positioning pin on the die to achieve positioning. There must be a guide pin on the mold to guide the material to achieve precise positioning.

The shape of the stopper pin can be designed into a circle, a fan, a hook, etc. in combination with the shape of the waste hole.

◆ 2. Measuring blade distance: suitable for 0.1~1.5mm thick sheets. When the sheet is too thin, the positioning accuracy is affected because the sheet is easily deformed by the stopper; the sheet that is too thick is not suitable for side edge punching.

◆ 3. automatic feeder fixed distance: automatic punch must use automatic feeder to feed. The automatic feeder has stereotyped products to choose from.