Process characteristics of tensile parts
The stretched parts are stamped and formed by the mold, which has beautiful appearance, high efficiency, high brightness, colorful, varied, anti-vibration and long life. If the stretched part is less technical, the stretched part is redesigned to stretch the qualified product.
Feeding difficulties are generally caused by too much feed resistance of the binder side.
If the surface roughness of the blank surface and the die radius is too quotient, or there is reverse forming, the local stretching is too large, the outer slider should be adjusted to reduce the blanking force, and the concave radius of the die should be appropriately increased to lower the surface.Building value and increase the gap between the stretch ribs.
If the local tensile deformation is too large and there is reverse forming, it should be solved by adding a process whisper or a process hole.
The tensile member is generally wrinkled and cracked during the first trial pulling. At this time, the environment of the splitting and pressing surface must be carefully observed to analyze various causes of cracking.
If the pressing surface has indentation, the radius of the concave corner of the die is cracked, indicating that the feeding is difficult; if the pressing surface forms a corrugation, the feeding is easy, and the material flow is difficult because of the occurrence of the corrugation, thereby causing wrinkling. Cracking, that is to say, in the course of stretching, the difficulty of material flow will lead to wrinkling and cracking of the tensile members, so different environments must be solved by different methods.
Features: Stretched products are stamped and formed by die, beautiful appearance, energy saving, high brightness, colorful, varied, anti-vibration, long life and so on.
The radius of the fillet between the flange and the wall of the tensile member:
4x#fI/h.v0 The radius of the fillet between the flange and the wall of the tensile member should be greater than 2 times the thickness of the plate, that is, r2≥2t. In order to make the stretching go smoothly, generally take r2=(5~10) t, the large flange radius should be less than or equal to 8 times the thickness of the plate, ie r2 ≤ 8t.
Uses: Wrap the stretch film on the tray items to achieve the effect of wrapping and binding. The items are integrated with the tray and are not easy to be scattered.
The radius of the fillet between the bottom of the tensile member and the straight wall should be greater than the thickness of the plate, ie r1 ≥ t. In order to make the stretching go smoothly, generally take r1=(3~5)t, and the large fillet radius should be less than or equal to 8 times of the plate thickness, that is, r1≤8t.
The feed is easy to be mainly because the feed resistance of the binder surface is too small, the contact of the binder surface is not good, or the designed tensile member is poor in processability.
If it is a pressing surface problem, it is required to study the pressing surface to ensure full contact, and also adjust the outer sliding block to increase the blanking force or increase the pressing area. If the stretched part is less technical, the stretched part is redesigned to stretch the qualified product.
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