1.What are the advantages of CNC NC machining technology?

A large number of tooling is reduced, and complex tooling is not needed for parts with complex shapes. To change the shape and size of parts, only the part processing procedure needs to be modified, which is suitable for the development and modification of new products.


① A large number of tooling is reduced, and complex tooling is not needed for parts with complex shapes. To change the shape and size of parts, only the part processing procedure needs to be modified, which is suitable for the development and modification of new products.

② The machining quality is stable, the processing precision is high, the repetition precision is high, which is suitable for the machining requirements of the aircraft.

③ The production efficiency is high under the condition of multi variety and small batch production, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting quantity.

④ The complex profile which can be processed by conventional methods is difficult to process, and even some parts which cannot be observed can be processed.

The disadvantage of NC machining is that the machine tool equipment is expensive, and it requires the maintenance personnel to have a high level.

2. Advantages of CNC milling machine in 5 axis machining?

3 axis machining center and vertical machining center are widely used in traditional mold processing to complete the workpiece milling. With the development of mold manufacturing and processing technology, the ball end milling cutter commonly used in traditional mold processing has obvious advantages, but if vertical machining center is applied, its bottom linear speed is zero and its finish is poor, In this way, the weakness of traditional mold processing is gradually revealed. 5 axis machining can process different sides of the workpiece without changing the position of the workpiece on the machine tool, which can greatly improve the processing efficiency of prismatic parts. It can be used for deep cavity mold, side wall of mold, flat surface and irregular surface of mold, different geometry of mold and inclined hole on inclined plane of mold. It can reduce the processing time, improve the processing accuracy and improve the production efficiency.

In the mold processing, the use of 5 axis machining center can avoid the interference of cutting tools. It can process the complex parts which are difficult to be processed by ordinary 3-axis machine tools. For the machining of ruled surface mold, the side milling one tool forming technology can be used. The processing quality is good and the efficiency is high. For the three-dimensional surface, especially for the large and flat surface, it can be processed by the large diameter end milling cutter close to the large surface, the number of tool runs will be reduced, the residual height is small, and the processing efficiency and surface quality can be effectively improved. Multi process and multi surface processing can be carried out by clamping multiple space surfaces of the die at one time, which can improve the processing efficiency and the accuracy of each surface position.


When the 5 axis machining center is used to process the mold, the cutting tool can always be in the most effective cutting state for the workpiece. In some machining fields, large-size cutting tools can be used to avoid mutual interference. The rigidity of this kind of cutting tool is good, and the machining accuracy and efficiency can be improved.5 axis machining center can not only complete the task of complex workpiece machining, but also improve the machining efficiency and shorten the machining process.

The 5 axis machining center adopts the optimized and high rigidity structure design, with the machining accuracy of 0.003 mm and the positioning accuracy of 5 μ m. The repeat positioning accuracy is 3 μ m. It is suitable for the processing of key parts in energy, aviation, ship and military industries. It is the only way to solve the processing of impellers, blades, marine propellers, heavy generator rotors, steam turbine rotors, large diesel engine crankshafts and so on. It is no exaggeration to call it a "high-precision" precision processing plant.

Due to the homogenization of manufacturing industry, the competition is more and more fierce. Only the unique core technology, under the premise of ensuring quality to achieve higher production efficiency, or do other people can not high value-added products, can stand out. It is in this context that 5 axis machining center is favored by more and more manufacturers.

3.Features of 5 axis machining center:

Feature 1: symmetrical structure, frame in frame structure and gravity center double drive mode are adopted to effectively improve the rigidity of the machine tool and suppress vibration.

Feature 2: improve the machining accuracy, improve the service life of machine tool and cutter, and enhance the reliability of machine tool.


Feature 3: it has the function of on-line programmable control of pushing and pulling force of workpiece, which can fully improve the internal prestress of workpiece, improve the processing accuracy of large thin-walled and slender parts and improve the processing yield.

Feature 4: equipped with direct drive swing angle milling head, larger torque, wider processing range and higher efficiency. Equipped with high torque and high precision b-axis, it has higher material removal rate than traditional machine.

Feature 5: it is equipped with programmable on-line control of the pushing and pulling force of the workpiece. The user can realize the dynamic servo control of the W-axis through the specific processing program instructions, so as to achieve the programmable control of the pre tightening pushing and pulling force of the workpiece during the part processing.

Feature 6: the tool is on three linear axes and the workpiece is on two rotary axes, with Zui excellent spindle support; The swing angle of axis B is ± one hundred and thirty °, C-axis continuous 360 ° Spin. The chain type tool magazine is integrated with the machine bed, with fast tool changing speed and high reliability.

4.What is CNC?

CNC machining is also called Computer Numerical Control machining. Before programming, it is necessary to analyze the process of the processed parts, draw up the processing plan, select the appropriate tool and determine the cutting parameters. In programming, some technological problems such as tool setting and machining route need to be dealt with. Therefore, the process analysis in programming is very important. When processing parts on ordinary machine tools, the operation procedure of each process is specified by the process specification or process card, and the operator processes the parts according to the steps specified in the process card. When machining parts on CNC machine tools, it is necessary to program all the technological process, technological parameters and displacement data to control the machining of machine tools. The processing technology of NC machine tool is basically the same as that of ordinary machine tool in principle, but the whole process of NC machining is automatic, so it has its own characteristics:


1). The content of working procedure is complex

This is because CNC machine tools are more expensive than ordinary machine tools. It is not cost-effective to only process simple processes, so more complex processes are usually arranged on CNC machine tools, and even processes that are difficult to complete on ordinary machine tools.

2). The arrangement of working steps is more detailed

This is because the problems that need not be considered in the processing technology of ordinary machine tools, such as the arrangement of working steps in the process, the determination of tool setting point, tool changing point and processing route, can not be ignored when compiling the processing technology of CNC machine tools.

3). Rely on the program to complete all the process.

4). NC machining program is the directive document of NC machine tool.

5). CNC machine tools are controlled by program instructions, and the whole process of machining is automatically carried out according to program instructions.

6). NC machining program not only includes the process of parts, but also includes the necessary process parameters to complete the process, such as cutting parameters, feed route, tool size number and machine tool movement process.

7). CNC machining has high efficiency, high machining accuracy, low labor intensity and strong adaptability to different workpieces.

5.About 3D printing technology

Advantages of 3D printing technology

(1) Save materials. It does not need to eliminate the leftover materials, improves the utilization rate of materials, and reduces the cost by abandoning the production line;

(2) It can achieve high precision and high complexity, and can manufacture very complex parts which can not be manufactured by traditional methods;

(3) Without traditional tools, fixtures, machine tools or any molds, 3D CAD graphics of any shape can be directly generated into real products;

(4) It can automatically, quickly, directly and accurately transform the 3D design of computer into physical model, and even directly manufacture parts or molds, thus effectively shortening the product development cycle;

(5) 3D printing has the characteristics of distributed production without centralized and fixed manufacturing workshop;

(6) 3D printing can take shape in a few hours, which enables designers and developers to realize the leap from plan to entity;

(7) It can print assembled products, so it can reduce assembly costs and even challenge mass production.


Disadvantages of 3D printing technology

(1) It has the weakness of high cost and long working hours

3D printing is still an expensive technology. Due to the difficulty of research and development of materials for additive manufacturing and the small amount of use, the manufacturing cost of 3D printing is high, but the manufacturing efficiency is not high.

At present, 3D printing technology is mainly used in the research and development of new products in China, with high manufacturing cost, low manufacturing efficiency and unsatisfactory manufacturing accuracy. 3D printing can not replace the traditional manufacturing industry at present. In the future development of manufacturing industry, "reduced material manufacturing method" is still the mainstream.

(2) It has no advantage in large-scale production

Since 3D printing technology has the advantages of distributed production, on the contrary, it has no advantages in large-scale production. Tianjin Tianyi Duowei Technology Co., Ltd. introduced that at present, 3D printing technology does not have the conditions to replace the traditional manufacturing industry. In terms of mass production and large-scale manufacturing, the traditional reduced material manufacturing method with high efficiency and low cost is better.

Now it seems unlikely that 3D printing will replace mass production. Not to mention that 3D printing technology currently does not have the ability to directly produce complex mixed material products such as automobiles. Even if this technology has made great progress in the future, it may take several months to completely print a car, and the cost is far higher than the cost shared by each car in the mass production of cars.

Therefore, for the production of products with a large number of rigid demands, the large-scale production with the advantage of scale economy is still more economical than the 3D printing production mode focusing on "personalization and customization".


(3) Print material restricted

The limitations and bottlenecks of 3D printing technology are mainly reflected in materials. At present, the main printing materials are plastic, resin, gypsum, ceramics, sand and metal, and the materials that can be used for 3D printing are very limited.

Although many homogeneous and heterogeneous materials have been developed for 3D printing, there is still a need to develop new materials, and some new materials are being developed. This demand includes two aspects: first, it is necessary to study the relationship among materials, processes, structures and properties, so as to clarify its advantages and limitations; Second, new testing techniques and methods need to be developed to expand the range of available materials.

(4) Accuracy and quality issues

Because the inherent forming principle and development of 3D printing technology are not perfect, the accuracy (including dimensional accuracy, shape accuracy and surface roughness), physical properties (such as strength, stiffness, fatigue resistance, etc.) and chemical properties of the printed parts can not meet the actual use requirements of engineering, and can not be used as functional parts, only as prototype parts, So its application will be greatly reduced.

Moreover, because 3D printing adopts the additive manufacturing process of "layered manufacturing, layer by layer superposition", no matter how closely the combination between layers is, it can not be comparable with the parts cast by traditional mold as a whole, and the microstructure and structure of the part materials determine the performance of the parts.

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