In the process of processing molds, machining centers have higher and higher requirements for accuracy and surface processing quality. To ensure the quality of mold processing, we should consider the selection of machine tools, tool handles, tools, processing schemes, program generation, operator requirements, etc.

Select high-precision and high-speed machining center

With the improvement of product design requirements and the development of high-speed and high-precision machining technology, the quality of mold CNC machining is greatly improved, the mold machining speed is greatly improved, the machining process is reduced, the production cycle and clamping times of the mold are shortened, and sometimes the time-consuming fitter repair work can be eliminated. The high-speed and high-precision machining of molds has gradually become one of the important contents of the technological transformation of mold manufacturing enterprises. The high-speed CNC machining center will inevitably replace the traditional low-speed machining, and the development of mold manufacturing technology will also bring us a richer product experience.

Adopt appropriate knife handle structure

The use of high-speed and high-precision machining centers will also drive the innovation of relevant process equipment. In particular, the influence of cutting tools on CNC machining quality and tool handles will become prominent. In the rotary tool processing system, the collet is closely connected with the machine tool (or its combination) to ensure the realization of tool processing performance. Generally, the interfaces between machine tools and tool shanks commonly used include HSK hollow tool shanks and BT tool shanks. The taper of the taper handle interface between the machine tool spindle and BT tool handle is 24:7. This kind of tool handle connection mode is suitable for traditional low-speed machining. Because the BT tool handle and the machine tool spindle are only conical fit, the conical fit clearance will increase under the action of high-speed centrifugal force, which will affect the quality of CNC machining. Generally, when the spindle speed exceeds 16000 rpm, we will need to use an HSK hollow handle. The HSK toolbar positioning structure is over-positioning and provides a standard connection with the machine tool. Under the pull of the machine tool, we can ensure that the short cone and the end face of the toolbar are closely matched with the machine tool.

Select the proper cutting tool

The rational use and selection of cutting tools will be an important factor affecting the quality of CNC machining. Cemented carbide tools are more and more widely used. In high-speed machining, coated cemented carbide will replace most steel cutting tools, including reamers, ball cutters, boring cutters, and other simple tools. Coated cemented carbide will play an important role in high-speed machining tool materials and be applied to most conventional machining fields.

Generally, we know that in rough machining, we will choose large-diameter tools for processing. To save costs and reduce the difficulty of tool manufacturing, we will use machine-clamped cemented carbide blades to make the rough machining chip removal as much as possible; In semi-finish machining, insert cutters with high speed and high feed are used to make semi-finish machining faster; When finishing, try to use a high-precision round head mirror blade on the cemented carbide toolbar to ensure the strength of the tool and the toolbar, which will not only ensure the machining accuracy but also save the expensive cost of selecting the overall alloy tool. In the process of machining, we also need to pay attention that the fillet radius of the inner contour on the finishing parts must be greater than or equal to the radius of the tool. Select the tool whose radius is less than the fillet radius at the corner to process in the way of arc interpolation or oblique line interpolation, to avoid overcutting caused by linear interpolation and ensure the quality of mold finishing.

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