Summary of common problems in high-speed CNC engraving

1. How to adjust the processing parameters when roughing is not good? If the spindle speed is reasonable, the tool life cannot be guaranteed. When adjusting parameters, first adjust the depth of feed, then adjust the feed speed, and then adjust the edge feed. (Note: The depth of adjustment is also limited. If the depth is too small and the layering is too much, although the theoretical cutting efficiency is high, the actual processing efficiency is affected by other factors, and the cutting efficiency is too low, so you should change a little tool to perform Processing, processing efficiency is high. Generally speaking, the minimum depth of the knife cannot be less than 10mm. 　　2. Can CNC milling only be rough machining, and CNC engraving can only be fine machining? 　　 Before answering this question, let’s first understand The concept of technological process. The roughing process has a large amount of machining and the finishing amount is small, so some people habitually regard rough machining as 'heavy cutting' and finishing as 'light cutting.' In fact, rough machining , Semi-finishing, and finishing are the process concepts, which represent different processing stages. Therefore, the accurate answer to this question is that CNC milling can be used for heavy cutting or light cutting, while CNC engraving can only do Light cutting processing.　　3. Can CNC engraving be used for rough machining of steel materials? 　　Judge whether CNC engraving can process a certain material, mainly depends on how big the tool can be used. The tool used in CNC engraving determines its maximum removal Ability. If the mold shape allows the use of tools with a diameter of more than 6 mm, it is strongly recommended to use CNC milling first, and then use the engraving method to remove the remaining material. 　　 4. Can the CNC machining center add a speed increase head to complete the engraving process?　　Can't be completed. This product appeared at the exhibition 2 years ago, but the engraving process cannot be completed. The main reason is that the design of the CNC machining center takes into account its own tool range, and the overall structure is not suitable for engraving processing. The main reason for the wrong idea is that they mistakenly regard the high-speed electric spindle as the only feature of the engraving machine.　　5. CNC engraving can use tools with a small diameter, can it replace EDM? 　　Cannot be replaced. Although the engraving process has shrunk The diameter range of milling tools can be realized by engraving. However, the length/diameter ratio of engraving tools is generally about 5:1. When using small-diameter tools, it can only be realized by engraving. Machining very shallow cavities, while the EDM process has almost no cutting force. As long as the electrode can be manufactured, the cavity can be processed. 　　 6. What are the main factors that affect the engraving process? 　　 Machining is a relatively complicated process. There are many factors that affect it, mainly as follows: machine tool characteristics, cutting tools, control systems, material characteristics, processing technology, auxiliary fixtures and surrounding environment. 　　7. What are the requirements for the control system of CNC engraving processing? 　　CNC Engraving processing is firstly milling, so the control system must have the ability to control milling. For small tool processing, it must also provide a feedforward function to reduce the speed of the path in advance to reduce the cutting frequency of small tools. At the same time, it is necessary to compare The smooth path section increases the cutting speed, thereby improving the efficiency of engraving processing. 　　 8. Which characteristics of the material will affect the processing? 　　 The main factors affecting the engraving performance of the material It is the type of material, hardness, and toughness. The material category includes metallic materials and non-metallic materials. In general, the greater the hardness, the worse the processability, and the greater the viscosity, the worse the processability. The more impurities, the worse the processability, the greater the hardness of the particles inside the material, and the worse the processability. A general standard is: the higher the carbon content, the worse the workability, the higher the alloy content, the worse the workability, the higher the content of non-metal elements, the better the workability (but the non-metal content in general materials is strictly controlled of).　　 9. Which materials are suitable for engraving processing?　　Non-metallic materials suitable for engraving include organic glass, resin, wood, etc., and non-metallic materials that are not suitable for engraving include natural marble, glass, etc. Metal materials suitable for engraving include copper, aluminum, and mild steel with a hardness less than HRC40. Metal materials not suitable for engraving include quenched steel.　　 10. What impact does the tool itself have on processing, and how?　　The tool factors that affect the engraving process include the tool material, geometric parameters, and grinding technology. The tool material used in the engraving process is cemented carbide material, which is a powder alloy. The main performance index that determines the material performance is the average diameter of the powder. The smaller the diameter, the more wear-resistant the tool, and the higher the durability of the tool. The sharpness of the tool mainly affects the cutting force.