Application of CNC Machining Technology in Feeder Production

As an advanced processing method, CNC machining technology has been widely used in the manufacturing industry. Its unique high-speed, high-efficiency, high-precision and rich processing forms and many other good uses have been more and more popular. Recognizing the new telecommunications system has triggered new structural forms. The production of modern radars requires new processes, and the application of CNC machining technology is particularly prominent.

2 Advantages of CNC Machining Technology CNC machining technology has great advantages compared with common machining technology, and with the technological advancement of CNC machining technology and related disciplines, the superiority is more prominent. From the perspective of motion control, CNC machining has a qualitative leap in the following two aspects: (1) Trajectory control, the most outstanding feature of CNC machining technology is that it can drive multi-axis linkage through digital control to form a specified tool path for common machining. Complex and cumbersome profile processing that cannot be achieved or even realized. Moreover, for different parts processing, the trajectory control only needs to modify the program software without changing the tooling equipment or production line, and the strain capacity is greatly enhanced; (2) positioning control, the closed-loop compensation function and programmability unique to the numerical control machine tool (ie The micro feed can be realized, which determines that the CNC machine tool can obtain precise positioning, effectively reduce random errors and improve machining accuracy. From the point of view of process parameter control, CNC machining can obtain a wide range of stable process parameters and digital control to accurately determine tool feed and spindle speed, thus improving machining quality. The high speed of CNC machine tools provides a material basis for the future high-speed machining trend. All these features make CNC machining technology with high precision, high efficiency, high flexibility, wide application range, and 3 CNC machining technology in the feeder system. Application and development trend 3.1 Application of CNC machining technology in feeder system The feeder system in the electronics industry has developed to date, and there are abundant materials and structural forms. The advancement of CNC machining technology makes these new designs possible in the feeder system. The five aspects are most closely related to CNC machining technology. 3.1.1 Power splitter, and differential modern power splitter and differential design are mostly designed with system integration, especially airborne radar, power splitter, and The differentials all adopt a networked structure, and the multiple single-function components previously used are unified into one device, which reduces loss and reduces noise, and facilitates acquisition of accurate telecommunication parameters. As one of the power dividers in our XXX products, The structure diagram is as shown.

The accuracy of the shape and size requirements is relatively small (caliber 20.05<5±0.05), and the wall thickness (1mm) is easy to deform, the structure is complicated, the processing is very difficult, and the ordinary milling machine can not be processed. In the process design, we selected the MH1000 series CNC milling machine for internal cavity milling, and the process parameters adopted high speed, small cutting depth and micro feed setting. A process rib of 0.05 is left at the bottom of the blank to reduce positional distortion. Numerical control machining plays an irreplaceable role in the processing of process ribs in the formation of process parameters of curve trajectories.

3.1.2 Feed horn With the development of radar index parameters towards a wider range and more accurate data measurement requirements, the structural design of the feed horn has become larger and more precise, which brings higher requirements to production and processing. Among them, the requirements for numerical control technology are increasingly urgent for program control. The characteristics of the CNC wire-cutting machine are shown in fete (blish electroformed aluminum core yin figure shown in Figure rf3).

For example, one feed horn in our XXX product has three times of change from ±0.15, and 78 pieces of copper plate (thickness 1mm) on both sides of the cavity. According to the current state of the art, the overall process is formed by electroforming. The structure of the electroformed aluminum core is shown in the figure. The 1mm narrow groove is the deepest 42. 39001. The current milling method can't be processed. Only the WEDM wire cutting machine can be used to machine 78 narrow grooves on both sides. To ensure the groove spacing and groove width accurately, only the CNC wire cutting machine can be selected. In fact, due to the inherent advantages of CNC wire-cutting machine tools, most of the current wire-cutting machine tools use digital without the need to manufacture electrodes of a specific shape, only need to input the control program, and can easily adjust the matching clearance of the matching parts by calculation; 2) Using digital control multi-axis composite motion, it can process the straight surface of complex shapes such as plane and cone; (3) The wire is continuously updated or reciprocated during processing, and the influence of the loss of the wire on the accuracy can be neglected; 4) High degree of automation, easy operation, short cycle and high efficiency.

3.1.3 Circular moment transformation The circular moment transformation is another typical function in the feeder system, which realizes the smooth transition of electromagnetic waves from round to square. These parts generally adopt electroforming process scheme, and one of our products has a circular moment transformation. The traditional route of cast aluminum core processing is generally preparation-car-milling-clamp-grinding, in which the milling bevel must be accurately connected with the machined surface, and the personal technical requirements of the milling machine are relatively high. After machining with a CNC lathe with a milling power head, all the machining of the square and circle transformation can be completed in one clamping, and the process route becomes the material-vehicle-grinding, which reduces the number of processes, improves the efficiency, and reduces the individual workers. Technical requirements to facilitate social production.

3.1.4 Phase shifter, duplexer aluminum matrix composite) Modern radar gradually uses a new type of microwave material - aluminum-based PTFE clad laminate. It is a multi-layer composite material consisting of three layers of material (copper foil layer, medium). The thickness of the copper foil is usually several micrometers to ten micrometers. The thickness of the dielectric layer is generally several millimeters to several millimeters, which directly affects the dielectric constant. The dielectric layer material is mainly polytetrafluoroethylene (PTFE), which is filled with a certain amount of ceramic powder. The thickness of the aluminum alloy plate depends on the structural requirements of the components. Radar products using this material generally have the following requirements for machining: the edge of the copper foil must not have a flange, especially the aperture on the line should be flat and not disconnected from the edge of the line; the surface of the workpiece must not have scratched pits.

The RT/Duroid6010 aluminum-based PTFE clad laminate is used for the duplexer in one of our products. For the high-precision size requirements of this new material and the complex structure of the duplexer, we have carried out the process analysis from the following three points.

The effect diagram of the duplexer processing has not changed, and the drilling has been improved. According to the actual oil of our company, the data is repaired. That is, the zero point of each part should be based on the actual data. From the composition and requirements of the material, we can not use the commonly processed aluminum. The required speed of the alloy should be selected from the machine tool material specification with higher spindle speed. The Y3 milling cutter speed is recommended as /min. This speed is high-speed cutting. The ordinary machine tool can not meet the requirements. Only the CNC machine with new motor can be considered. Test, in the same case of other cutting parameters, starting from the speed / min, gradually increase the speed, found Y 4 milling cutter at the speed of 6000r / min, Y3 milling cutter, Y1.65 drill bit at 8000r / min, copper foil surface Basically there is no flange, the burr is also very small, basically can meet the processing requirements to change the tool with smaller diameter (keyway milling cutter Y2Y 1, drill Y1Y0.7YQ6 - one of these tools is necessary for processing duplex), the speed is still It is 8000r/min, we have decided to process on the machining center with the speed of 10000r/min. The picture shown is the double-powered front-side milling of the steps, the cavity and the upper and lower sides. Obviously, this requires the line fabrication accuracy to be less than ±0.05 considering the processing pin hole error, positioning, clamping error and actual machining error. The line fabrication accuracy should be controlled at ±0.02. However, our line production accuracy is +-003. Therefore, relying on The pin positioning is not guaranteed by the accuracy of ±Q05. It must be corrected. The measurement range of the existing three-coordinate measuring instrument is 200<100, and the whole plate cannot be measured at one time. In order to ensure the accuracy of the batch while ensuring the accuracy, we have equipped the optical measuring instrument on the machine tool to directly measure on the machine tool by the inspector to provide the measured data for the processor. The advantage of this operation is that the measurement environment is basically the same as the processing environment, ensuring that the precision double-machine processing requires frequent tool changes, and it is mass production. In order to shorten the cycle and improve efficiency, the machining center should be selected. Our selected machining center is HAAS20HP produced by Swiss “Mikron” company. It has 20 tool positions (15 tools for machining), repeat positioning accuracy Q002, drilling accuracy ±Q02 (meeting ±0.05 accuracy requirements), stroke 500< 1.5 feeder manufacturing tool feeder feeder manufacturing requires a lot of tooling molds, such as: (1) machining (milling wire cutting, etc.) positioning fixture; (2) welding fixture; (3) cold drawing, hot extrusion and other deformation Core mold; (4) casting mold for precision casting; (5) bending mold, etc. The manufacturing process of these tooling molds also requires the application of CNC machining technology (such as CNC wire cutting technology) 3.2 Application of CNC machining technology in feeder production The development trend of the modern manufacturing industry, CNC machining technology with the development of modern manufacturing industry will inevitably develop in both hardware and software, and this development will continue to meet the needs of modern radar feeder production hardware to promote high-speed The main advantages of high-speed machining are: (1) high efficiency, which can remove a large amount of excess material in a single process, and achieve high machining accuracy. Surface quality, greatly reducing the processing time of parts; (2) Machinable difficult-to-cut materials, nickel-based alloys, titanium alloys, fiber-reinforced plastics, etc. become easy to cut under high-speed cutting; (3) dry cutting can be achieved, according to statistics In developed countries, coolant and waste liquid treatment account for 14% to 16% of total production cost, while tools account for ~4% of total production cost. Dry cutting can greatly reduce production costs. At present, many research institutions in the industry are studying dry cutting. With detailed implementation, high speed cutting can play an important role in achieving dry cutting. The CNC machine with the new motor can meet the needs of high speed, high power, high feed speed and high acceleration required for high speed machining. It is believed that CNC machining technology will play an important role in the future high-speed machining. On the basis of consolidating and developing intelligent manufacturing technologies such as CNC technology and processing units and flexible manufacturing units, it will use parallel engineering technology and integrated technology. , advanced technologies such as intelligent technology and network technology, realize efficient and flexible manufacturing systems, and establish a flexible, streamlined and flexible manufacturing model. 4 Conclusion Modern manufacturing from CIMS systems to concurrent engineering (CE) to agile manufacturing (AM) And virtual manufacturing (VM), the development is very rapid, CNC processing technology as the execution terminal of these advanced technologies, there will be a broader development space CNC technology advancement, will certainly make a greater development of the modern radar industry contribution

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