Knowledge decryption of CNC engraving machine processing

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Knowledge decryption of CNC engraving machine processing

Post by perfectlaserChina » Fri Jul 20, 2018 1:17 am

CNC engraving machine specializes in small tool finishing, milling, grinding, drilling and high-speed tapping. It is widely used in 3C industry, mold industry, medical industry and other fields. This article collects common questions about CNC engraving.

1. What are the main differences between CNC engraving and CNC milling?
Both CNC engraving and CNC milling use the principle of milling. The main difference is in the tool diameter used, where the common tool diameter for CNC milling is 6-40 mm, while the CNC engraving tool diameter is 0.2-3 mm.

2. Can CNC milling be used only for rough machining and CNC engraving can only be used for finishing?
Before answering this question, we first understand the concept of the process. The rough machining process has a large amount of machining, and the finishing machining volume is small. Therefore, it is customary to consider rough machining as "heavy cutting" and finishing machining as "light cutting". In fact, roughing, semi-finishing, and finishing are process concepts that represent different stages of processing. Therefore, the exact answer to this question is that CNC milling can be used for heavy cutting or light cutting, while CNC engraving can only be done with light cutting.

3. Can CNC engraving work for rough machining of steel materials?
Judging whether CNC engraving can process a certain material mainly depends on how large the tool can be used. The tool used in CNC engraving determines its maximum resilience. If the shape of the mold allows the use of tools with a diameter of more than 6 mm, it is highly recommended to use CNC milling and then engrave the remaining material.

4. Does the spindle of the CNC machining center add a speed-increasing head to complete the engraving process?
It can not finish it. This product appeared at the exhibition two years ago, but it could not be finished. The main reason is that the CNC machining center is designed with its own tool range in mind and the overall structure is not suitable for engraving. The main reason for this erroneous idea was that they mistakenly used the high-speed electric spindle as the only feature of the engraving machine.

5. CNC engraving can use a tool with a small diameter. Can it replace EDM?
Can't be replaced. Although the engraving process reduces the range of tool diameters for milling, small molds that previously could only be machined by EDM can now be achieved with engraving. However, the length/diameter ratio of the engraving tool is generally around 5:1. When using a small-diameter tool, only a very shallow cavity can be machined, and there is almost no cutting force in the EDM process, and the cavity can be machined as long as the electrode can be fabricated.

6. What are the requirements of the CNC machining process for the control system?
CNC engraving is first and foremost milled, so the control system must have the control of milling. For small tool machining, the feedforward function must be provided at the same time, the path is decelerated early, and the cutting speed of the small tool is reduced. At the same time, it is necessary to increase the speed of the path in a relatively smooth path segment, thereby improving the efficiency of engraving processing.

7. Which materials are suitable for engraving?
Non-metallic materials suitable for engraving include plexiglass, resin, wood, etc. Non-metallic materials that are not suitable for engraving include natural marble, glass, and the like. metal materials suitable for engraving include copper and aluminum, soft steel with hardness less than HRC40, and metal materials not suitable for engraving including hardened steel.

8. What is the role of cutting fluid?
Metal processing attention plus cooling oil. The function of the cooling system is to take away the heat of cutting and flying debris and to lubricate the processing. The coolant will cut the tropics, reducing the heat transferred to the tool and motor and increasing their service life. Take the flying debris away from secondary cutting. Lubrication reduces cutting forces and makes machining more stable. In the copper processing, the use of oily cutting fluid can improve the surface quality.
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