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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

Características da tecnologia de corte fino

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. A precisão dimensional de finos soco 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. Pode economizar muita energia elétrica consumida por máquinas-ferramentas de corte e processamento de corte. A superfície da peça de trabalho após o corte fino é endurecida e o processo de têmpera subsequente pode ser cancelado;
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

O mecanismo da tecnologia de corte fino

A multa soco 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

Requisitos para multa SocoMorrer

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. A pressão de blanking fino é grande, e a folga entre as matrizes convexas e côncavas é pequena. Durante a fabricação e montagem do molde, a folga deve ser distribuída uniformemente e mantida a neutralidade. 0. 002 ~ 0. 005 milímetros.
2. As partes principais do molde devem ter resistência e rigidez suficientes, e a precisão de correspondência mútua é alta. A parte de trabalho tem alta resistência ao desgaste e a deformação elástica não é permitida durante o trabalho.
3. Controle rigorosamente a profundidade do punção que entra na matriz côncava (geralmente controlada em 0,025 ~ 0,05 mm) para evitar danos à aresta de corte.
4. Considere adequadamente o projeto de exaustão do molde, preste atenção à lubrificação da parte de trabalho do molde e prolongue a vida útil do molde.

Multar SocoMaterial

O processo de estampagem fina não é apenas um processo de cisalhamento, mas também inclui o processo de fluxo plástico e compósito de cisalhamento do metal, portanto, o material de puncionamento fino deve ter boa plasticidade, ou seja, o material deve ter uma menor taxa de escoamento (σ_s /σ_b ), alto alongamento e boa estrutura (boa dispersão), o material que atende aos requisitos acima, a deformação plástica inicial precoce sob a ação de baixa carga, tem uma grande capacidade de deformação, de modo que o fenômeno de rasgo não ocorra durante o fino processo de apagamento.

Cerca de 95% das peças de branqueamento fino são peças de aço. Para aço carbono com teor de carbono inferior a 35% e resistência à tração 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.

Durante o processo de puncionamento, as partículas de cementita podem ser espremidas na matriz de ferrita macia, de modo a evitar a aresta de corte e evitar rachaduras. Aço carbono e aço cromo após o recozimento são adequados para corte fino. Exceto para latão de chumbo, a maioria dos metais não ferrosos e ligas podem ser usadas para corte fino.

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