The honeycomb core structure is made by humans following the principle of the hexagonal honeycomb constructed by bees. Paper-based honeycomb core has light weight, low density, high specific strength and stiffness, good self-extinguishing performance, excellent chemical properties, etc. It is precisely because of its many advantages that humans use it extensively in areas with strict design structures such as aviation, aerospace, and submarine.

       Due to the special material properties and structural design characteristics of honeycomb core parts, it cannot be clamped, positioned and cut like metal parts. For CNC machine tools, tools, tooling, cutting parameters, programming methods, process control and quality in CNC machining The control and other aspects have put forward very high requirements. Difficulties in CNC machining of honeycomb core parts are: (1) The material is porous and thin-walled and cannot withstand the cutting force laterally; (2) The material is flexible and cannot be positioned like a rigid material; (3) The upper and lower parts are curved structures. , Processing requirements are high; (4) The parts are of non-linear size, and quality control cannot be guaranteed by conventional means. Therefore, the commonly used CNC machining methods for metal parts are no longer applicable to the machining of honeycomb core parts.

      In addition to meeting the requirements of rigidity and precision, the honeycomb core structure processing machine tool puts forward higher requirements for the equipment according to the particularity of the processing object.

      1. The paper material and porous thin-wall structure of the honeycomb core structure determine the particularity of its processing method, that is, high-speed cutting can be used, and the spindle speed must exceed 18000r/min, otherwise cutting will not be possible.

      2. The machine is equipped with five coordinates and has the function of five axes and five linkages. In order to solve the problem that the honeycomb core cannot withstand the cutting force laterally, a special cemented carbide honeycomb combination tool is used when processing paper-based honeycomb core parts, and the honeycomb core hexagonal lattice is cut at a high speed to process the honeycomb core surface. Shape, not squeeze and friction. When cutting the honeycomb surface, the cutting edge of the tool is always tangent to the honeycomb surface. This requires the spindle of the machine tool to change the angle at any time as the surface changes. Therefore, five-axis five-linked processing equipment must be used.

      3. There should be no oil stains during processing. If the honeycomb core parts are immersed in oil or coolant during the processing, it will cause degumming in the subsequent bonding process. Therefore, the processing machine must have a complete oil-proof device to ensure the normal processing of the parts.

      4. Equipped with dust collection device. The dust generated during the processing of the paper-based honeycomb core will cause harm to the human body and also affect the original parts of the processing machine tool. Therefore, the dedicated high-speed honeycomb processing equipment is equipped with a dust collector. The dust suction port of the dust suction device should be able to follow the swing with the A/C double swing head to ensure real-time collection of dust and composite chips around the spindle and the spindle head.

      5. Retention of paper-based honeycomb core parts. The holding condition determines the condition of the honeycomb core parts during the processing. If the holding condition is not ideal, debonding will occur during the processing and the honeycomb core will be pulled up and cut.

      In view of the limitations of the original honeycomb core parts, Rifa Precision Machinery Co., Ltd. applied the honeycomb core parts holding platform of Zhejiang University based on the principle of magnetic field and friction adsorption. Adhesive materials, thereby greatly reducing processing costs, is a green manufacturing method that is completely harmless to the human body and the environment.

       In the oil pollution problem during the processing of honeycomb core parts, the two Italian viaduct five-axis machining centers introduced by a domestic aircraft manufacturer often dripped oil during the machining process of the electric spindle, which could not be done due to the limitations of the structure. To be absolutely oil-proof, it will have a greater impact on normal production. The aircraft honeycomb structure processing equipment produced by Rifa Precision Machinery-viaduct type five-axis linkage solves the problem of spindle oil dripping from the source. The spindle bearing is lubricated with grease, which not only reaches the high speed required for honeycomb processing, but also completely solves the spindle. Oil dripping phenomenon.

      Through the development of processing equipment for aircraft honeycomb core parts, Rifa Precision Machinery has acquired rich experience in the requirements of honeycomb core structure parts for equipment, CNC machining technology requirements and the retention method of honeycomb parts, and broadened the processing scope of CNC machine tools. It lays the foundation for the application of the honeycomb core structure in the fields of aviation, aerospace, submarine, high-speed rail and so on.