What is the difference between an engraving and milling machine and an engraving and milling center machine?
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The difference between engraving and milling center machine and engraving and milling machine.
1. The engraving and milling machine is not equipped with a tool magazine, but a pneumatic locking tool spindle can be installed.
2. The engraving and milling center machine must be equipped with a tool magazine and a pneumatic tool lock spindle, which can automatically change and set tools according to the program in the execution of the processing program.
3. The engraving and milling machine mainly adopts two aspects of technology. One is a high-speed CNC system and a high position loop gain, which ensures the consistency of the machining contour accuracy at high and low speeds; the other is the fixed parts of the mechanical part such as the bed. , Beams, columns and other high rigidity enough to resist the acceleration impact of moving parts, and moving parts such as workbenches should be light and highly flexible.
4. Engraving and milling machines have certain technical requirements for options. For example, the automatic tool setting device is a necessary option for engraving and milling machines. It can accurately measure the tool length (within 0.), thereby improving efficiency and reducing the chance of human error. , To minimize the traces of the knife. It should be noted that the automatic tool setting device on the engraving and milling machine is different from that on the CNC milling machine. Because very small tools (such as 0.1mm) or drill bits below 1mm are sometimes used, the down force must be small when setting the tool. Generally, down force is used. Fully automatic tool setting instrument less than 0.8N.
5. The main components of the engraving and milling machine must meet the requirements of high-speed and high-precision processing. For example, high-speed spindles generally use two types, one is a direct high-speed electric spindle used within 1-2.2kw, the speed is below 36, the cutting torque is 1-2N, and the air cooling method is generally adopted. The other is a built-in high-speed electric spindle used within 2.2-7.5kw, the speed is below 30, the cutting torque is 3-9N, and water cooling is generally used.
6. Of course, special attention should be paid to the necessary accessories of the engraving and milling machine, such as the sharpener and the measuring microscope. The knife sharpener is an indispensable machine for sharpening knives and is used in conjunction with a measuring microscope. The CBN grinding wheel of the sharpener is very critical. Generally, about the size of the grain is used for rough grinding, and the one-grain grinding wheel must be used for fine grinding. The measuring microscope must have a scale to accurately measure the length and angle of the tool tip. Usually the manufacturer should provide it as a complete set. One point must be emphasized: measuring and grinding is an important part of processing, and the dimensional deviation of the tool must be less than 0.
What are the distinguishing characteristics of the engraving and milling machine?
First of all, we have to distinguish the difference between these three models:
1. CNC milling and machining center is used to complete the processing equipment of the workpiece with a large amount of milling. The rigidity requirements of the non-moving parts of the CNC milling machining center are very good, and the rigidity requirements of the moving parts are very good. It can perform heavy cutting, but because the moving part is also huge, the flexibility of the machine tool is sacrificed, and there is nothing for small parts and rapid feed.
2. CNC engraving and milling machine is used to complete small milling volume or soft metal processing equipment. The rigidity of the non-moving part is required to be good, and the rigidity of the moving part should be flexible as the prerequisite, as light as possible, while maintaining a certain degree of rigidity. It can carry out relatively small processing, and the processing precision is high. High-speed processing is possible for soft metals. However, heavy cutting is impossible due to poor rigidity.
3. The high-speed cutting machine is used to complete the medium milling amount and reduce the grinding amount after milling to the lowest processing equipment. The rigidity requirement of the non-moving part is very good, and the rigidity requirement of the moving part is better, and it is as light as possible. It can carry out small and medium cutting (for example, the general φ10 flat-bottomed knife, for the 45 steel () deep cutting depth is 0.75 is better). However, under the correct use, it can exert high efficiency and low cost, so that the amount of grinding becomes extremely small. Incorrect use will immediately pile up scraps of knives.
Strictly speaking, engraving is a part of milling, and whether to buy an engraving machine or a CNC milling machining center is a question that I often have to ask myself. In addition, there are currently popular high-speed cutting machine tools.
A machine tool that can recover the investment in a short period of time is a good machine tool. The design service life of CNC machine tools is generally 7 years, mainly based on the service life of CNC. In this way, the proportional relationship between spending money and earning money will directly affect your business, so careful analysis of functions and selection is a necessary condition for effective investment .
How to solve the contradiction that the above is light but the rigidity is also good on the machine, the key is to work hard on the mechanical structure.
1. The bed adopts a mesh structure with high and low ribs, and some directly adopt a honeycomb interconnected hexagonal mesh structure.
2. Ultra-wide columns and beams. Everyone knows that the gantry-type structure has always been the first choice for high-speed cutting equipment manufacturers due to its excellent symmetry and excellent rigidity.
3. The significant difference between the moving part and the CNC milling is that the distance between the guide rail and the guide rail is widened to overcome the problem of bad torque.
4. In terms of materials, Meehanite cast iron is generally used, that is, inoculated cast iron. A certain proportion of silicon (Si) is added during the pouring of molten iron to change the internal structure of the iron, making it more resistant to punching, and the rigidity is significantly improved. .
5. The rigidity of the machine tool is mainly used to overcome the strong impact of the moving part on the non-moving part when the moving part is moving at a high speed. Therefore, the guide rail and screw rod are required to be thicker, and the rigidity of the connecting part is strengthened.
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