Control and application of the most popular mechan

2022-07-31
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The control and application of mechanical motion in the design of stamping dies (Part 2)

some workpieces have peculiar bending shapes, or they cannot fall off from the female die in the normal way after bending. At this time, it is often necessary to use a wedge structure or a rotary pin structure. For example, using a wedge structure can complete bending less than 90 degrees or hook back, and using a rotary pin structure can realize one-time forming of cylindrical parts

it is worth mentioning that for some shell parts, such as the computer floppy drive shell, due to the long bending edge and the sliding between the elbow and the sheet metal, it is easy to wipe out the scurf during bending, the material zinc coating falls off, and the effect of frequent polishing bending punches is not ideal. The common practice is to coat the bending punch with titanium to improve its smoothness and wear resistance; Or insert a roller at the R angle of the bending punch to convert the bending sliding of the elbow and the sheet metal into rolling. Since the rolling friction is much smaller than the sliding friction, it is not easy to scratch the workpiece

5. The control problem of mechanical movement in the drawing die is the difficulty of manufacturing single-layer graphene and the basic movement of using the

drawing process is that the unloading plate first contacts and presses firmly with the sheet metal, the punch drops to contact with the sheet metal, and continues to drop, and enters the concave die. The punch, the concave die and the sheet metal generate relative movement, resulting in the volume forming of the sheet metal. Then the punch and the concave die are separated, and the die slider pushes the workpiece out to complete the drawing movement

the movement of the discharge plate and the sliding block is very critical. In order to ensure the quality of the drawing part, the movement of the discharge plate must be controlled to make it contact with the sheet metal before the punch, and the pressing force must be sufficient, otherwise the drawing part is easy to wrinkle or even crack; Secondly, ensure that the pressure of the die slider is sufficient to ensure the flatness of the bottom surface of the drawing part

the design of drawing compound die is reasonable, which can well control the movement process of structural parts and achieve the purpose of multi process combination. For example, the design of a typical blanking, deep drawing, edge cutting and punching compound die

in addition, the drawing parts of some ornaments and daily necessities need to have a flanging (or flanging) process. The roller structure is also used in the mold design, so that the night vision mirror can see us in the dark. The friction force during the flanging process is very small, and it is not easy to scratch the workpiece surface

for those deep drawing structural parts that need to rotate in the motor, the requirements for cutting height, runout, etc. are quite high. It is necessary to design a special rotary cutting structure in the die. Using the rotary (cutting) motion for trimming can not only ensure high dimensional accuracy of cutting, but also beautiful burrs and punching lines of cutting. It is worth mentioning that after the actual design improvement, this rotary cutting structure has been very easy to process and manufacture the die, and has been applied to the continuous drawing die

6. Control and application of mechanical motion in continuous dies

continuous dies often include stamping processes such as blanking, bending and deep drawing at the same time, so the mechanical motion in the stamping process also includes the basic motion modes of these three processes. The control of motion in continuous dies should be divided into basic processes for control respectively

generally, continuous dies require to continuously accelerate the stamping speed and improve the production efficiency. For some stamping parts with complex and special shapes, the stamping movement is time-consuming, and the stamping movement with high efficiency can be decomposed in the design of continuous dies. For example, in the continuous die design of Engineering expansion screw cylinder, the cylinder forming motion can be divided into four processes: 90 degree arc bending on both sides ~ 60 degree arc bending in the middle ~ overall rounding ~ roundness correction, which can not only improve the efficiency, but also ensure the roundness of stamping parts

it should be specially pointed out that the continuous mold also involves the feeder and blowing device in the actual production, so these factors should be fully taken into account in the design of the material toughness is a major test item, so that the movement of the punch, mold, feeder and blowing device can be well coordinated in time, and the continuous mold can be truly produced smoothly

7. Conclusion

although the basic motion principles of various processes are different, they also have something in common, that is, the motion of the discharge plate (or slider) is an important control factor. In fact, in the mold design, the stamping process of the product can not be as simple as the basic movement of various processes. We should make a motion analysis of the product process according to the specific situation, and then make further design

when analyzing the product process movement, we should mainly consider its necessity, timeliness, feasibility and creativity. Necessity refers to the use of basic motion principles to judge which motions are needed to realize the product process; Temporality refers to the sequence of movements required; Feasibility refers to whether the required movement can be achieved through structural design and mechanical design by increasing the iron content in molten aluminum; Creativity means to be good at boldly adopting new methods to realize the product process when the aforementioned movement cannot be realized or the movement cannot fully realize the product process, that is, the flexible application of mechanical movement mentioned above

there are various mechanical movements in the stamping process, and the effects of various mechanical movements on the realization of stamping process and the quality of stamping parts are also different. Therefore, the control and flexible application of mechanical movements in the stamping die design is of great significance to improve the design level and ensure the quality of stamping parts

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