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Ten questions and answers on CNC engraving hand processing
Date: 2022-08-12
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Ten questions and answers on CNC engraving hand processing

1. What is the main difference between CNC engraving prototyping and CNC milling prototyping?
Both CNC engraving prototyping and CNC milling prototyping use the principle of milling prototyping. The main difference is in the diameter of the tool used. The commonly used tool diameter range for CNC milling hand plate processing is 6-40 mm, while the tool diameter for CNC engraving hand plate processing is 0.2-3 mm.

2. Is CNC milling and prototyping only for rough prototyping, and CNC engraving prototyping only for fine prototyping?
Before answering this question, let's first understand the concept of process. The rough rapid prototype processing process has a large amount of rapid prototype processing, and the fine rapid prototype processing process has a small amount of hand board processing. Therefore, some people habitually regard rough rapid prototype processing as "heavy cutting" and fine hand processing as "light cutting". In fact, rough prototyping, semi-finishing prototyping, and fine prototyping are process concepts, which represent different prototyping stages. Therefore, the accurate answer to this question is that CNC milling prototyping can do heavy cutting or light cutting, while CNC engraving prototyping can only do light cutting prototyping.

3. Can CNC engraving prototyping be used for rough prototyping of steel materials?
To judge whether CNC engraving prototyping can process a certain material, it mainly depends on how big a tool can be used. The tool used in CNC engraving prototype processing determines its maximum cutting capacity. If the shape of the mold allows the use of tools with a diameter of more than 6 mm, it is strongly recommended to machine with a CNC milling hand first, and then remove the remaining material by engraving hand machining.

4. Can a speed increase head be added to the spindle of the CNC prototyping center to complete the engraving prototyping?
Can not finish it. This product appeared at the exhibition two years ago, but it could not complete the engraving prototype processing. The main reason is that the design of the CNC prototyping center considers its own tool range, and the overall structure is not suitable for engraving prototyping. The main reason for this misconception is that they mistaken the high-speed motorized spindle as the only feature of the engraving machine.

5. CNC engraving prototyping can use small diameter tools, can it replace EDM prototyping?
cannot be replaced. [**]lthough engraving prototyping reduces the range of tool diameters for milling prototyping, small molds that were previously only processed by EDM can now be realized by engraving prototyping. However, the length/diameter ratio of engraving prototyping tools is generally around 5:1. When a small diameter tool is used, only a very shallow cavity can be machined on the prototype, and there is almost no cutting force during the EDM prototype process. [**]s long as the electrode can be produced, the cavity can be machined with the prototype.

6. What are the main factors that affect the processing of the engraving prototype?
Robotic rapid prototype processing is a relatively complex process, and there are many factors affecting it, mainly the following points: machine tool characteristics, tools, control systems, material characteristics, rapid prototype processing technology, auxiliary fixtures and surrounding environment.

7. What are the requirements for the control system for CNC engraving prototype processing?
CNC engraving rapid prototype processing is first of all milling rapid prototype processing, so the control system must have the control ability of milling rapid prototype processing. For small tool prototyping, the feedforward function must be provided at the same time, the path speed is reduced in advance, and the frequency of tool breakage of small tools is reduced. [**]t the same time, it is necessary to increase the cutting speed in the relatively smooth path section, thereby improving the processing efficiency of the engraving prototype.

8. What properties of the material will affect the prototyping?
The main factors that affect the engraving performance of materials are material type, hardness and toughness. Material categories include metallic and non-metallic materials. In general, the greater the hardness, the worse the prototyping workability, and the higher the viscosity, the worse the prototyping processability. The more impurities, the worse the workability of the prototype, the greater the hardness of the particles inside the material, the worse the processability of the prototype. [**] general standard is: the higher the carbon content, the worse the workability of the prototype, the higher the alloy content, the worse the processability of the prototype, the higher the content of non-metallic elements, the better the processability of the prototype (but the non-metallic content in the general material. is strictly controlled).

9. Which materials are suitable for engraving prototype processing?
Non-metallic materials suitable for engraving include plexiglass, resin, wood, etc., and non-metallic materials unsuitable for engraving include natural marble, glass, etc. Metal materials suitable for engraving include copper, aluminum, mild steel with hardness less than HRC40, and metal materials unsuitable for engraving include quenched steel.

10. What influence does the tool itself have on the processing of the hand plate, and how?
The tool factors that affect the processing of engraving prototypes include tool material, geometric parameters, and grinding technology. The tool material used in engraving rapid prototype processing is cemented carbide material, which is a powder alloy. The main performance index that determines the performance of the material 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. For more CNC programming knowledge, pay attention to the WeChat public account (NC programming teaching) to receive the tutorial. The sharpness of the tool mainly affects the cutting force. The sharper the tool, the lower the cutting force, the smoother the rapid prototype processing, the higher the surface quality, but the lower the tool durability. Therefore, different sharpness should be selected when processing different materials on the prototype. When the rapid prototype is used to process soft and sticky materials, the tool needs to be sharper. When the hardness of the rapid prototype processing material is relatively large, the sharpness should be reduced and the durability of the tool should be improved. But it should not be too blunt, otherwise the cutting force will be too large, which will affect the rapid prototype processing. [**] key factor in tool grinding is the mesh size of the finishing wheel. Grinding wheels with high mesh can grind finer cutting edges, which can effectively improve the durability of the tool. Grinding wheels with high mesh can grind a smoother flank and improve the surface quality of cutting.

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