Sheet metal stamping process and precision progressive die design

1. What is the function of drawing sill (drawbead) in panel dies?
The role of a deep drawing sill is as follows:
1, increase the feeding resistance, make the drawing surface withstand enough tensile stress, improve the rigidity of the drawing parts and reduce the defects such as the concave, distortion, relaxation and ripple caused by the rebound.
2, adjust the flow of material, make the flow resistance of each part uniform in the process of drawing, or the amount of material flowing into the mold is suitable for the needs of all parts of the work piece, so as to prevent the phenomenon of “many wrinkles and few cracks”.
3. Expand the adjusting range of the blank holder force. On the double dynamic press, the adjustment of the four angles of the outer slider can only adjust the edge force roughly, and can not completely control the feed volume in all places just in line with the needs of the workpiece, so it also needs to rely on the edge surface and the deep drawing reinforcement to control the pressure of all parts.
4. When there is a deep drawing reinforcement, it is possible to reduce the requirements for the machining roughness of the edge surface, which reduces the manufacturing difficulty of the drawing die of the large covering parts; at the same time. Due to the existence of drawbead, the gap between upper and lower blank faces is increased, the wear of the blank holder is reduced, and the service life of the die is improved.
5, correct the unevenness of the material and eliminate the possibility of slippage. Because when the material flows through the drawbead and then flows into the concave die, it is equivalent to roller leveling.
2. What is the role of process cuts in large panels?
When some deep local protuberances or drums are needed to be stamped in the middle part of the panel, the partial rupture of the workpiece is often caused by the failure of the material to be supplemented from the outer part of the blank. At this time, the appropriate position of the local protuberance deformation zone can be considered to break out the process incision or process hole, so that the easily ruptured area can get the material from the interior of the deformation zone.
3. How to cut the cutting process?
There are two kinds of punching methods for the art cut.
1. Blanking out this method is applied to the occasion where the local forming depth is relatively shallow.
2. Cutting out this is a common method in the process of drawing, which can make full use of the plasticity of the material, that is to use the radial extension of the material at the beginning of drawing, and then cut out the process cut. Using the tangential extension of the material, a greater forming depth can be obtained. When the process holes are cut out in the drawing process, the tearing process is often used, and the material is not completely separated. The waste of the cut can be removed in the subsequent trimming process. Otherwise, it will produce difficulties in removing waste from the die.
4. What is the principle of the layout of the process?
1, the incision should be adapted to the contour of the local protrusion so as to make the material flow reasonably.
2, there should be enough edge between the incisions so that the punch can be tensioned to ensure that the forming is clear and the ripples are avoided, so that the good edge quality of the flanging edge can be obtained after the repair.
3. The cut part (opening) of the incision should be on the edge of the adjacent protrusion or the area liable to rupture.
4, the number of incisions should ensure that the deformation of the material in all parts of the projection tends to be uniform. Otherwise, it is not necessary to prevent the formation of the grain. The original design is only about two technological cuts, and the crack is still produced in the middle. Then the intermediate incision (the dotted line) is added to the original.
5, which stamping process must be used with precision progressive die?
In large quantities of stamping production, multi position precision progressive die must be used for small and medium sized punching parts with high accuracy. For larger stamping parts, it is suitable for stamping of multi station transmission dies.
6. What are the requirements for vulnerable parts in Precision Moulds?
The precision die structure is complex, the manufacturing technology requirements are high, and the cost is relatively high. In order to ensure that the whole die has a high life span, especially after the die parts are damaged or worn, the replacement is quick, convenient and reliable. Therefore, the important parts of the die are interchangeable. The die parts have interchangeable die, which can be called interchangeable punching dies.
7. What is the significance of the layout design of the precision progressive die?
Answer: reasonable layout design can make the mold work coordinate and coordinate, can greatly improve the utilization of material, manufacturing precision, productivity and die life, and can also reduce the difficulty of mould manufacturing. Therefore, layout design is the most important comprehensive technical problem in the design of precision progressive die. It is necessary to make a comprehensive analysis and judgment of the stamping direction, the number of deformation, the corresponding deformation degree and the possibility of the die structure and the processing craft, so that the layout can be reasonable.
8. What is the carrier?
When progressive dies work, objects carrying blanks to various workstations for punching and forming are called carriers. The part of the connection between the carrier and the blank is called the lap edge, and the part connected with the blank is called the lap. When working, in the dynamic processing, the carrier is always kept in stable position accurately, so the carrier must have a certain intensity.
9. What are the requirements for the precision progressive die for the die seat?
M precision progressive die requires high strength, good rigidity and high precision. Therefore, the structural steel is usually used as the mold base, and its thickness is thicker than that of the standard mold base. The upper die base is thickened 5 to 10mm, and the lower die base is thickened 10~15mm.
10. What are the types of the die structure?
The commonly used type of die structure is integral. Three pieces of collage and chunk, in ordinary flushing