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¿Cómo eligen los maestros moldeadores CNC la fresa adecuada?

Choose the right milling tool, High-Precised CNC mold components, use the rolling and cutting method in face milling, and use the milling cutter for hole machining when the conditions are right. Manufacturers can greatly increase the production capacity and improve processing efficiency without investing in new equipment. Save a lot of time and cost.

Al seleccionar una fresa adecuada para la tarea de mecanizado, se deben considerar varios problemas de la geometría, el tamaño y el material de la pieza a mecanizar.

Ángulo de avance de la fresa

The lead angle is the angle between the cutting edge and the cutting plane. The lead angle has a great influence on the radial cutting force and depth of cut. The amount of radial cutting force directly affects the cutting power and the anti-vibration performance of the tool.
The smaller the main deflection angle of the milling cutter, the smaller the radial cutting force and the better the vibration resistance, but the cutting depth is also reduced.
Use a 90° lead angle when milling the plane with the square shoulder. This type of tool has good versatility and is used in single and small batch processing. Since the radial cutting force of the tool is equal to the cutting force, the feed resistance is large and the vibration is easy, so the machine tool is required to have large power and sufficient rigidity.

Al mecanizar el cepillo con los hombros, también se puede utilizar un cortador con un ángulo de inclinación de 88°. En comparación con la fresa de ángulo de inclinación de 90°, se mejora el rendimiento de corte. También es muy común el fresado plano de fresas de escuadra de 90°. En algunos casos, esta elección está justificada. La forma irregular de la pieza de trabajo que se fresa o la superficie de la fundición causarán un cambio en la cantidad de profundidad de corte, las fresas de escuadra pueden ser la mejor opción. En otros casos, sin embargo, una fresa de planear estándar de 45° puede beneficiarse más.

When the plunging angle of the milling cutter is less than 90°, since the chip thickness is thinner and the axial chip thickness is smaller than the feed rate of the milling cutter, the cutter plunging angle will have a great influence on the feed amount per tooth to which it is applied.
In face milling, a face milling cutter with a 45° cut-in angle will make the chips thinner. As the plunging angle decreases, the chip thickness will be less than the feed per tooth, which in turn will increase the feed rate by a factor of 1.4.

La fuerza de corte radial de la fresa de ángulo de inclinación de 45° se reduce considerablemente, que es aproximadamente igual a la fuerza de corte axial. La carga de corte se distribuye en el filo de corte más largo y tiene una buena resistencia a las vibraciones. Es adecuado para el voladizo del husillo de la mandrinadora y fresadora. Ocasiones de procesamiento más largas. Cuando el cepillo se mecaniza con este tipo de herramienta, la hoja tiene una baja tasa de rotura y una alta durabilidad; Al mecanizar una pieza de hierro fundido, es menos probable que el borde de la pieza de trabajo provoque astillado.

Selección del tamaño de la fresa

The standard indexable face milling cutter has a diameter of Φ16——Φ630mm. The diameter of the milling cutter should be selected according to the milling width and depth. Generally, the larger the depth and width before milling, the larger the diameter of the milling cutter should be. When roughing, the diameter of the milling cutter is smaller; when milling, the diameter of the milling cutter is larger, try to accommodate the entire processing width of the workpiece, and reduce the marking between the two adjacent feeds.
In the face milling of large parts, the smaller diameter milling cutters are used, which leaves a lot of room for productivity. Ideally, the cutter should have 70% of the cutting edge involved in the cutting. Tool size becomes especially important when milling a hole with a milling cutter. The diameter of the milling cutter is too small relative to the bore diameter, and a core may be formed in the center of the hole during machining. When the core is dropped, the workpiece or tool may be damaged. If the cutter is too large, it will damage the tool itself and the workpiece. Because the cutter is not cut in the center, it may collide at the bottom of the tool.