Temps de lecture estimé : 6 minutes

Fine Blanking Die

The proportion of fine blanking in industrial production is increasing, so the requirements for molds are getting higher and higher. How to extend the life of the mold, reduce wear, reduce costs, and increase economic benefits are the most concerning issues for manufacturers. There are many factors that affect the life of the mold. Wear is the most important factor affecting the life of the mold. Today, we will further analyze and discuss the wear mechanism and protection of the decay. Fine Blanking Die

Caractéristiques de la technologie de découpage fin

The fine blanking technology adopts the acceptable gap, the ring gear plate, and the top plate in the die to play the role of the reverse die so that the stamping parts can obtain higher dimensional accuracy and surface roughness. In some industrially developed countries, the machining accuracy of the mold industry has reached the micron level, which can replace cutting under certain conditions. Fine Blanking Die

Fine blanking technology has the following advantages: Fine Blanking Die

1. La précision dimensionnelle des fines perforation parts can reach the IT7~IT8 level, and the surface roughness of the shear section is Ra 2. 4~0. 4μm, with high perpendicularity and parallelism; Fine Blanking Die
2. Compared with cutting, fine blanking technology can generally improve work efficiency by 10 times; Fine Blanking Die
3. Il peut économiser beaucoup d'énergie électrique consommée par les machines-outils de coupe et le traitement de coupe. La surface de la pièce à usiner après le découpage fin est écrouie et le processus de trempe ultérieur peut être annulé;
4. The fine-blanking composite process can be used to simplify the forming process, and it can be combined with other forming processes such as bending, extrusion, embossing, etc. for composite or progressive stamping. The parts produced to account for more than 20% of all fine blanking parts. Fine Blanking Die

Le mécanisme de la technologie de découpage fin

L'amende perforation process adds rounded corners to the die edge, reduces the gap between the concave and punch die, and adds a ring gear pressure plate and an ejector. In order to inhibit the tearing of the material before punching and ensure the smooth progress of plastic deformation, the metal material needs to be subjected to static pressure in the punching deformation area, and the material is in a state of three-way compressive stress (punching force, blank holder force, and back pressure), which is a precise A necessary condition for rushing.

During fine blanking, the blank holder presses the material to prevent the material outside the shear deformation zone from flowing with the punch during the shearing process. The support function of the blank holder and the counter pressure plate, coupled with the small gap between the convex and concave dies (usually 0.5% of the material thickness, 1/10 of the ordinary punching), make the workpiece tightly pressed and prevent the parts from being damaged. Fine Blanking Die

Warpage creates tensile stress, leading to brittle fracture, which constitutes a ductile material shear condition. If necessary, the three-way compressive stress tensor in the deformation zone can be increased to improve the plasticity of the material. The punching punch and the die edge of the blanking die can be rounded to reduce the stress concentration at the edge and avoid cracks. , to improve the stress state of the deformation zone, and obtain bright blanking vertical sections and blanking parts with small slope, smooth surface, and high dimensional accuracy. Fine Blanking Die

Of course, the fine blanking process is required to achieve the required purpose. In addition to the plastic shear deformation caused by the special structure of the working part of the fine blanking die, there are also three-way pressures such as pressing, punching and reverse topping, and these three pressures are required to be pressed.

Sequential pressure. Therefore, precision blanking with a ring gear platen requires a triple-action die and press with three pressures, as well as a push-piece and unloading action after the sheet is separated. There are also certain requirements for fine blanking materials, lubrication, and fine blanking mechanism. Only when the above sufficient conditions are met can the purpose of fine blanking be achieved. Fine Blanking Die

Exigences pour l'amende Coup de poingMeurt

Since the blanking conditions and material separation of fine blanking are very different from ordinary blanking, there are certain requirements for the mold. Fine Blanking Die

1. La pression de découpage fine est grande et l'écart entre les matrices convexes et concaves est petit. Lors de la fabrication et de l'assemblage du moule, l'écart doit être uniformément réparti et maintenu en neutralité. 0. 002 ~ 0. 005 mm.
2. Les parties principales du moule doivent avoir une résistance et une rigidité suffisantes, et la précision d'adaptation mutuelle est élevée. La pièce de travail a une résistance élevée à l'usure et la déformation élastique n'est pas autorisée lors du travail.
3. Contrôlez strictement la profondeur du poinçon entrant dans la matrice concave (généralement contrôlée à 0,025 ~ 0,05 mm) pour éviter d'endommager le tranchant.
4. Considérez correctement la conception d'échappement du moule, faites attention à la lubrification de la partie active du moule et prolongez la durée de vie du moule.

Bien Coup de poingMatériel de fabrication

Le processus de découpage fin n'est pas seulement un processus de cisaillement, mais comprend également le processus composite d'écoulement plastique et de cisaillement du métal, de sorte que le matériau de poinçonnage fin doit avoir une bonne plasticité, c'est-à-dire que le matériau doit avoir un rapport de rendement inférieur (σ_s /σ_b ), allongement élevé et bonne structure (bonne dispersion), le matériau qui répond aux exigences ci-dessus, la déformation plastique initiale précoce sous l'action d'une faible charge, a une grande capacité de déformation, de sorte que le phénomène de déchirure ne se produira pas pendant l'amende processus de suppression.

Environ 95% des pièces de découpage fin sont des pièces en acier. Pour les aciers au carbone avec une teneur en carbone inférieure à 35% et une résistance à la traction σ_b of 300-600MPa, due to the good plasticity of the ferrite, satisfactory fine-blanking effects can be obtained.

Because the carbon content is between 0.35% and 0.7%, or even higher than carbon steel and its alloy steel, if the edges of the convex and concave die to encounter the pearlite flakes that are not easily deformed, the section will be torn and the section will be torn. The quality declines, which causes the wear of the mold, so it is necessary to use appropriate heat treatment to make the cementite spherical and small particles, which are evenly distributed in the fine-grained ferrite.

Pendant le processus de poinçonnage, les particules de cémentite peuvent être pressées dans la matrice de ferrite douce, afin d'éviter le tranchant et d'éviter les fissures. L'acier au carbone et l'acier au chrome après recuit conviennent au découpage fin. À l'exception du laiton au plomb, la plupart des métaux et alliages non ferreux peuvent être utilisés pour le découpage fin.

Poinçonneuse à vendre