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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 de la tecnología 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. La precisión dimensional de la multa puñetazos 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. Puede ahorrar una gran cantidad de energía eléctrica consumida por las máquinas herramienta de corte y el procesamiento de corte. La superficie de la pieza de trabajo después del corte fino se endurece y el proceso de enfriamiento posterior se puede cancelar;
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

El mecanismo de la tecnología de corte fino

La multa puñetazos 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 la multa Puñetazotroqueles

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 presión de corte fino es grande y el espacio entre los troqueles convexos y cóncavos es pequeño. Durante la fabricación y el montaje del molde, el espacio debe distribuirse uniformemente y mantenerse neutral. 0. 002 ~ 0. 005 mm.
2. Las partes principales del molde deben tener suficiente resistencia y rigidez, y la precisión de coincidencia mutua es alta. La parte de trabajo tiene una alta resistencia al desgaste y no se permite la deformación elástica durante el trabajo.
3. Controle estrictamente la profundidad del punzón que ingresa al troquel cóncavo (generalmente controlado a 0,025 ~ 0,05 mm) para evitar daños en el borde de corte.
4. Considere adecuadamente el diseño de escape del molde, preste atención a la lubricación de la parte de trabajo del molde y prolongue la vida útil del molde.

Multa Puñetazomaterial de grabación

El proceso de troquelado fino no es solo un proceso de corte, sino que también incluye el flujo plástico y el proceso compuesto de corte del metal, por lo que el material de punzonado fino debe tener una buena plasticidad, es decir, el material debe tener una relación de rendimiento más baja (σ_s /σ_B ), alta elongación y buena estructura (buena dispersión), el material que cumple con los requisitos anteriores, la deformación plástica inicial temprana bajo la acción de una carga baja, tiene una gran capacidad de deformación, por lo que el fenómeno de desgarro no ocurrirá durante la fina proceso de borrado.

Alrededor del 95% de las piezas de corte fino son piezas de acero. Para acero al carbono con un contenido de carbono inferior a 35% y una resistencia a la tracción 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 el proceso de punzonado, las partículas de cementita se pueden comprimir en la matriz de ferrita blanda, para evitar el borde cortante y evitar el agrietamiento. El acero al carbono y el acero al cromo después del recocido son adecuados para el corte fino. A excepción del latón de plomo, la mayoría de los metales no ferrosos y las aleaciones se pueden usar para cortes finos.

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