The eight stripping methods for bending dies in stamping processing are introduced by the stamping parts manufacturer. 1. Automatic separation type (see Figure 1) 2. Manual separation type 3. Mechanical type 4. Hydraulic type 5. Pneumatic type 6. Fully automatic type 7. Combined type. The corresponding type can be selected according to different needs. Various specifications and models are available for selection. Suitable for products of various shapes. High cost performance. Convenient and fast. Strong practicality. Good effect. Customer satisfaction. Balford Precision Stamping is a manufacturer with 20 years of experience in precision stamping, stretch forming, and precision machining, providing customers with a one-stop service of mold development and design, stamping, deep drawing, and assembly. With rich experience, please consult and place custom orders.
When the hemming height is less than 1/3 of the ram stroke, box-shaped stamping parts can adopt the pass-through stripping structure as long as there is no high requirement for the flatness of the bottom surface. There are two forms of pass-through stripping mechanisms: one is to directly eject the workpiece through an ejector device set in the mold cavity; the other is to design a notch on the mold. The first form is simple and reliable, but has low production efficiency. The second method is more complex. It also has many disadvantages. It is not easy to operate. The cost is high. The effect is not good. It is easy to damage. During the stripping process, there is no need to adjust the rigidity of the die. The beneficial effect is: high work efficiency and easy automation, but stamping parts with high requirements for bottom surface flatness or those where the hemming position must not be scratched are not suitable.
2. Ejector-type discharge
Mainly applicable to bending dies for U-shaped parts. Using a single ejector plate structure, product accuracy and production efficiency can be improved without increasing the weight of the die. The ejector plate is shaped to match the discharge end face of the workpiece, placed at the bottom of the die cavity, and powered by springs, rubber springs, or the return stroke of the press slide.
3. Discharge by pulling hook
Utilizing the difference in wall thickness of the workpiece before and after forming, a pulling hook is installed on the die to separate the workpiece from the punch. The stripping method is the ejector plate. This structure is simple and reliable, convenient to use, and low in cost. It is suitable for workpieces with complex shapes or large batch sizes in mass production. It has good economic benefits. Its advantages are: 1. Stable operation; 2. Easy operation; 3. Long service life; 4. Good safety. 5. Low cost. 6. Wide application range. 7. Easy to promote. 8. Suitable for small parts and workpieces with small bending depth.
4. Discharge by knock-out rod
This utility model is used for workpieces with large area and large bending depth. The knock-out rod and knock-out plate are respectively located on both sides of the punch. This device has the advantages of simple and compact structure, reliable operation, high production efficiency, and low manufacturing cost. It is particularly suitable for stamping and forming of large-tonnage parts. This utility model mainly adjusts the shape of the die by changing the feed speed of the knock-out rod to meet the processing requirements of workpieces of different sizes. The use effect is good. It can be used for various materials. Good versatility. Convenient to use. Easy to operate. Easy to promote. Its mold structure diagram and arrangement are the same as those of the inverted blanking die.
5. Axial discharge
It is suitable for closed-loop and open-loop workpieces whose central axis is a straight line, but not suitable for cases where the central axis is a curve. By modifying the design of the die and punch, they become movable cores. Using this new type of mold to process cam cavities has the following advantages: ① Increased production efficiency; ② Convenient and reliable operation; ③ Extended service life; ④ Reduced processing cost. As shown in Figure 1. The structure is simple and reasonable. Convenient and flexible to use. Safe and reliable. Easy to promote and use. Compact structure. Under the action of spring force, when the punch moves downward, the stripping ring moves backward; during the return stroke of the punch, the roller drives the stripping ring to move forward and push the workpiece away from the punch.
6) Pin ejector type stripping.
It works in conjunction with a stripper plate and is used for stampings with a large bottom area and high flatness requirements. The pin is backed by a heavy-duty spring for pressure. The lower die uses a cam mechanism to position and clamp the upper die and pin holes, preventing relative sliding; the die structure is simple and reliable; adjustment is convenient, and production efficiency is high. 1. Working principle is shown in Figure 1. 2. Action process. 3. Functional features. 4. Applicable scope. 5. Easy operation. 6. Strong practicality. When the upper die pressure is released, the pin returns under spring action and pushes the stamping part off the punch and
7) Ring-type stripper
If the punch is wide but narrow, and the cross-section is not sufficient to accommodate a spring, a stripping ring can be used to press the part against the punch. After the part is stripped, the stripping ring retracts under spring action.
8) Lifting hook type stripper
This is a positive stripping method, used for workpieces with relatively high stripping force after bending.