Transmission problem in continuous die stamping process

1. Guide pin function 　　 guide pin is one of the ways that the material belt can be conveyed equidistantly. In the continuous die stamping process, how to transfer each semi-finished product to each stamping engineering station at an equal distance is the most important subject for continuous die stamping. If relying on the external feeder alone, there will be other factors that will not achieve the precise and equidistant feeding goal, so other methods are needed to assist the feeding distance accuracy. The guide pin can make the material belt reach the purpose of equidistant transmission, and when the feeding distance is slightly different, the tapered tip of the guide pin can correct the misfeed position of the material (the amount of guide is only about one-third of the guide pin∮ diameter, Exceeding this error range, the guide pin cannot be guided) to ensure the accuracy of the feeding distance.　　二. Type of guide pin 　　 1. Penetrating guide pin 　　 Penetrating guide pin mainly uses the guide pin ∮ diameter as the positioning basis. Since the guide pin needs to pass through the positioning hole, the diameter of the guide pin ∮ needs to be smaller than the diameter of the positioning hole ∮, and the difference between the guide pin ∮ diameter and the positioning hole ∮ diameter becomes the feeding error value.　　2. Taper guide formal guide pin 　　Tapered guide pin mainly uses the hole feature and the taper of the conical guide pin as positioning. Theoretically speaking, conical guidance will be more accurate than using ∮ diameter guidance, but when using this method of design, you need to consider factors such as processing capacity, processing accuracy, etc., to avoid processing errors and cause mold-related problems. Simply put: when there is a slight difference in the feeding distance, which causes the size of the stamping product to deviate, the taper-guided type can almost not see the difference in the feeding distance with the naked eye. 3. The guide pin fixing method can generally be simply divided into two types: fixed type and movable type. The accuracy of the positioning of the two designs is not much different. The main difference is that the fixed design will destroy the overall material belt when the material is incorrectly fed. The style is less likely to be. Several common methods are described as follows: 　　1. Fixed stripper plate 　　 Directly fix the guide pin on the stripper plate. This method has lower processing cost and lower parts cost. It is the current general design method for guide pins.　　2. Fixing the upper splint 　　 fixes the guide pin on the upper splint. The advantage of this method is that the straight part of the guide pin can be protruded by adjusting the length of the contour sleeve. Generally, in the stamping process, if the positioning hole is punched and worn and the diameter is reduced, it will often cause the guide pin to interfere with the positioning hole, resulting in uneven feeding, and the fixed upper clamping plate avoids similar problems. However, this method has higher processing costs and higher parts costs, and this design is rarely used at present. At present, the fixed stripper plate can also overcome this problem by processing the stripper plate, the protrusion of the guide pin, and other methods. 3. Stripper movable type This method is generally used in two ways, one is the penetrating guide pin, the other is the tapered guide pin; a. If used in the penetrating guide pin, when stamping thicker materials Even if the feeding position is offset, the guide pin may retreat due to the thick material, and cannot pass through the material belt to achieve the positioning function. Therefore, it is recommended to use the movable guide pin design, the first after the positioning hole is punched , The second station uses fixed guide pins to avoid positioning pitch errors due to spring fatigue or other factors. b. If it is used in the tapered guide pin, it is not subject to this restriction. 4. The movable guide pin of the upper splint is fixed on the upper splint in the same way as the fixed type. Only the template behind the guide pin is drilled and tapped, and springs and stop screws are set to allow the guide pin to encounter obstacles. Back, protect the guide pin.