Transmission problems in the stamping process of continuous drawing dies
1. Guiding sales function
The guide pin is one of the ways that the material belt can be conveyed equidistantly. In the continuous drawing die stamping process, how to transfer the half products to each stamping engineering station at an equal distance is a very important subject for continuous drawing die stamping. If relying on the external feeder alone, the remaining components will be affected, and the precise equidistant feeding target cannot be reached, so other methods are needed to assist the feeding distance accuracy. The guide pin can allow the material belt to reach the purpose of equidistant transmission, and when the feeding distance is slightly different, the tapered tip of the guide pin can correct the misfeeding position of the material (the amount of guide is only about one-third of the guide pin∮ diameter, If the deviation limit is exceeded, the guide pin cannot be corrected), and the accuracy of the conveying distance is confirmed.
2.Guidance for sales varieties
# Penetrating guide pin
The penetrating guide pin must use 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 deviation value.
# The taper guide formally guides the pin
The important point for the taper guide pin is to use the round hole characteristics and the taper of the conical guide pin as positioning. Theoretically speaking, the conical guidance will be more accurate than the application of ∮ diameter guidance. However, when planning using this method, you need to consider the processing talent, processing accuracy… and other components to avoid processing deviations and mold-related problems. To put it simply: when there is a slight difference in the feeding distance, which results in the size deviation of the stamping product, the taper-guided type can almost not see the difference in the feeding distance with the naked eye.
3. Guiding pin fixing method
Ordinary can be easily distinguished into two types: fixed type and behavior type. The accuracy of the positioning of the two plans is not much different. The difference is important. When the feed is misfeed, the fixed plan will destroy the whole material belt, while the behavior type is less. Several commonly used methods are described as follows:
# Fixed stripping plate
Simply fix the guide pin on the stripper plate. This method has a lower processing cost and a lower cost of parts. It is the current guide pin spreading plan.
# Fixed upper splint
Fix the guide pin on the upper splint. The advantage of this method is that it can adjust the length of the equal-height sleeve to reach the amount of protrusion of the straight side of the guide pin. Normally in the stamping process, if the positioning hole is punched and worn and the aperture shrinks, it will often cause the guide pin to interfere with the positioning hole, resulting in disobedience of the feed, and the upper splint is fixed to avoid similar problems. However, this method has a higher processing cost and a higher cost of parts. Currently, this type of plan is rarely used. The current fixed stripper plate can also overcome this problem by processing stripper plates, guiding pin protrusions, and other methods.
#Stripping board behavior
There are two general application methods of this method, one is penetrating guide pin and the other is taper guide pin; , The guide pin may be removed due to the thick material, and cannot pass through the material belt to reach the positioning effect. Therefore, it is recommended to use the fixed type guide pin in the first and second stations after the positioning hole is punched. Guide the pin, so as not to cause the positioning pitch deviation due to the fatigue of the spring or other components. b. If it is applied to the taper guide pin, it is not subject to this restriction.
# Upper splint behavior
The guide pin is also fixed on the upper splint. The planning method is similar to that of the fixed type. Only the template behind the guide pin is drilled and tapped, and springs and stop screws are set so that the guide pin can be removed when it encounters obstacles to protect the guide pin.
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