Xi 'an aviation power control co., LTD. (west point) is the China aviation industry group company engine fuel control system products, professional manufacturers, at the same time with world famous aircraft manufacturing company honeywell, Hamilton sundstrand, goodrich, Eaton and other companies set up a partnership, carry out the subcontract production of parts processing business. West point company products in the production of aviation engine and aircraft parts processing process, due to the use of advanced processing equipment and technology, the technical innovation, introduced advanced processing equipment, the company's aviation manufacturing equipment of numerical control rate is more and more high, high efficiency, high quality of nc machining is widely used in the company, to promote the development of the company production technology level.

CNC high speed machining equipment in the west of the present condition of the company products used in manufacturing

In recent years, with the rapid development of national economy and national defense industry, national demand for aviation manufacturing equipment is also growing rapidly. Avic west control company in order to improve the manufacturing quality of aviation products, shorten production cycle, increased the investment in technical renovation, the introduction of advanced processing equipment, the configuration of the corresponding nc cutter. Company in CNC high speed machining process, although the relevant supporting technologies, such as cutting tool technology, high speed machining) technology has failed to keep up with, in some difficult machining special-shaped sometimes quite difficult, but in the process of new product development and production has accumulated valuable experience. As companies adopt high-speed five-axis linkage machining center machine tool processing the curved surface of CAM, CAM parts surface is complexity, material is 38 crmoala nitride state after heat treatment, surface hardness is 62 H p R C. To complete product development, ensure the type components the processing precision, the development of the company type technology experts and researchers from the CAM surface design, processing procedures, the determination of process route, heat-treatment deformation control of nc tool selection, tooling design and fabrication of the scientific research and technology research, finally realizes the sticklebacks, surface processing surface changes. Surface processing success represents the west point CAM development companies of high technology, high level and high quality production capacity. At present, the company in the aviation engine fuel control adjusting device special-shaped processing to continue in the new challenges and breakthroughs.

West point 1 company in the manufacture of aviation products demand for CNC high speed machining

Aerospace products of the company divided into military and subcontract 2 aspects, in summary the product "advanced". First of all, on the structure of aviation products, a large number of companies using the composite structures, as well as aluminum alloy, titanium alloy, stainless steel and high temperature alloy material. Secondly, in terms of process equipment, development of high performance aircraft engine fuel control system components required for metal mold aluminum alloy mould, nonferrous and black metal forging mold, forging steel mould and other's processing difficulty also increases.

The traditional machining technology has been unable to meet these requirements effectively, and the characteristics and advantages of high-speed machining technology for the realization of the aviation product new structure, new material, and high precision process equipment processing provides a more effective solution. Application high spindle speed and feed rate of high speed cutting processing can make the process smoothly, achieve high accuracy, the quality of machining surface of workpiece is almost equivalent to that of grinding, realized "by milling and grinding" effect, which can implement shell, axle sleeve, special-shaped class high quality processing. For low rigidity thin in the aviation product, shaft, thin wall parts, can be finished in high quality; For high-precision technology and equipment on the mold cavity surface processing, can save the bench behind repair process, direct processing; Nitride state, quenching of the CAM surface of alloy steel and precision valve bushing component can also be directly processing is complete.

2 the core of the CNC high speed machining technology

CNC high speed machining technology, nc high speed cutting tool technology, CNC high speed machining technology and CNC high speed machining test technology is the core of the development of CNC high speed machining technology, nc cutting tool selection and direct impact on the basis of high-speed machining equipment to realize the high efficiency and low cost. In the process of the development of high speed cutting, the development of machine tools and cutting tools complement each other and promote each other. In the component made of machine tool, cutting tool and machining process system, the cutting tool is one of the most active factors. Tool cutting performance is good or bad depends on the composition of material and structure of tools, especially for high speed machining productivity, cutting tool life, high and low, the processing cost how many, the merits of the machining accuracy and surface quality, etc., to a large extent depends on selection of proper cutting tool materials and cutting tool structure. Therefore nc tool selection is very important to CNC high speed machining process.

Under the present situation of aviation products CNC high speed machining technology and the need to solve the problem, focus on west controlled company in high efficiency, high speed cutting numerical control tool, high speed machine tools in the production situation and the common problems in application.

West point company aviation product development situation of CNC high speed machining technology

1 the company used in aviation composite structure materials

(1) the overall structure of stainless steel and aluminum alloy material.

To improve product reliability, reduce costs and reduce the weight of the parts, these parts are mostly use integral structure made of solid stainless steel, aluminum alloy material, 80% ~ 90% of the material in the processing to get rid of, and the heat generated by the high speed cutting deformation, cutting force is small, less parts, so the only way to improve production efficiency is adopted for high speed milling machining center.

(2) titanium alloy and nickel base alloy difficult cutting materials.

Titanium (ni) alloy has high strength, good thermal strength and chemical activity, etc, at present, the company USES titanium and nickel base alloy material of the important parts of aviation products. Using high speed cutting, the cutting speed can be increased to more than 80 m/min, 8 times the speed of the conventional cutting. Processing of this kind of parts material is characterized by high cutting force, cutting temperature, work hardening and stick knife phenomenon serious, cutting tool wear easily.

2 aircraft composite structure of machining technology

From aircraft composite structure materials, development trend and the features of aircraft composite structure of machining technology mainly include the aluminum alloy structure of high speed machining technology and titanium (ni) alloy cutting processing technology of hard processing material such as two aspects.

(1) aluminum alloy high-speed machining technology.

Designed for high speed cutting aluminum alloy machining center spindle speed is generally in more than 10000 r/m I n, some can be as high as 60000 ~ 100000 r/min, the cutting speed can reach 2000 ~ 2000 m/min, the processing of feed speed of 2 ~ 20 m/m I n, material removal rate of 30 to 40 k g/h, the workbench of plus (minus) speed reaches 1 ~ 10 g. At present, the company most of the spindle in the production of the actual use of spindle speed at 8000 r/m I n, failed to give full play to the efficiency of the machine tool. Some machine adopt domestic tool can only be used under 3000 ~ 4000 r/min, 8000 r/min or more imported cutting tools must be used.

(2) cutting of difficult-to-machine materials processing technology.

Inconel718 nickel-based alloy GH169 () and T (I) A l6V4 titanium alloy is used in the manufacture products of the company, typical difficult-to-machine materials because they are hard to processing, so commonly used low cutting speed. Company is currently in machining technology level is still in exploring study, only the selected cutting speed can reach 80 ~ 100 m/m I n, has not been applied on a large scale in the production. If choose high speed machining, can greatly improve production efficiency, reduce the tool wear and improve the product surface quality of parts.

3 high speed cutting tool materials

The development of high speed cutting technology, cutting tool technology plays a key role. High speed cutting tool materials and cutting tool manufacturing technology have great changes have taken place. Suitable for high speed cutting tool material basically has: N P C B cubic boron nitride cutting tools and coating carbide cutting tools, ceramic knives and super-hard material cutting tools.

Four high-speed tool system

The handle is a key component of the high speed machining, high speed cutting tool, because of the tool rotation speed is high, no matter from the guarantee machining accuracy into consideration, or from the operating safety into consideration, the clamping technology of it have very high requirements. Traditional way of the handle connected to the machine tool spindle is 7:24 taper shank (BT, ISO), the collet chuck, screws and other traditional forms of the handle and cutter clamping methods cannot meet the requirements of applicable high-speed machining, so the development of new type of high-speed tool system has become improve the high speed cutting system is an important part of. In the handle, Germany developed a connection method of HSK hollow taper shank short handle H S K short taper shank with using 1:10 taper, the taper, shorter than standard 7:24 taper shank, flange end face and the taper shank can be contact at the same time, has the very high connection precision and rigidity, can adopt high grade balance and spindle automatic balance of the system technology, high speed cutting process can guarantee machining accuracy, guarantee high productivity, safety and reliability. Is set by the international standardization organization committee SO/I DI DI S standard and Germany N69893 H S K - 1 handle high-speed cutting has become a company the handle of the mainstream.

CNC tool of high speed cutting's present situation and existing problems

1 the status quo of domestic cutting tool industry development of high speed cutting tool

In recent years, as national aviation industry's growing demand for high speed machining tool, tool manufacturers for domestic high speed machining technology and high speed machining tool in a series of research and development work, has made certain progress. Such as chengdu tool research institute, into a volume group co., LTD., Shanghai tool works co., LTD. Tools such as industry backbone enterprises, around the high-speed machining technology, the carbide materials, coatings and cutter machining, etc to enhance investment in the technological upgrading, and achieved initial results, provides products and technology for aviation enterprise.

2 west control problems that exist in the company in high speed cutting tool

For now, the company in the manufacturing of high precision, high efficiency, high reliability cutting product and process technology, imports more than 80%, China's tool industry cannot meet the needs of the aviation products high speed machining. The main reason is that China's tool industry research and development and innovation ability there is a big gap compared with abroad.

(1) as the primary carbide grades of tool material has bigger gap with foreign products, affecting the overall level of cutting. Currently only zhuzhou diamond cutting tools co., LTD and chengdu tool research institute, a unit of the performance of the individual brands close to foreign products, and the speed of the new brand innovation and upgrade slow, make the quantity bedding face is wide general mechanical processing industry in our country the cutting level is in a state of low speed, inefficient.

(2) in terms of coating technology, in addition to the chengdu tool research institute developed coating technology and equipment, our country is lack of the basic theory research, and lack of technology and equipment development, industry basically all the introduction of equipment, introduction of technology way.

(3) in terms of cutting tool structure innovation, is basically a blank, in the international machine tool exhibition, it is difficult to found that the original cutting tool products in our country. The reason for this is that the body of the cutting tool industry in China is still in the pattern of traditional standard cutting tools of production, production of universal standard tool still accounts for the most parts of cutting tool company.

Behind of cutting technology and cutter in our country, but also in the structure of cutting tool industry in China, in China only a few tools company really have cemented carbide cutting tool material and coating the two core technology, most of the cutting tool factory are lack of carbide material is the core technology, although some cutlery factory introduced the coating equipment, but I don't have the ability to develop and further restricts the cutting tool company bigger and stronger.

CNC high speed machining equipment in the company to use common problem

Numerical control high-speed cutting device realizes zero polishing polishing of parts and precision machining of high hardness materials, has brought the higher machining efficiency. We see in the numerical control high-speed cutting equipment to "bang however move" at the same time, more clear understanding to the numerical control high-speed cutting equipment, there are some difficulties and problems in application:

(1) CNC high speed machining equipment of the high cost, long investment return cycle. Nc equipment itself is not only the cost is higher, and the cost is also high, relatively high-end CNC high speed machining equipment shall exceed the 150 ~ 1.6 million yuan, under the high speed running state, the average service life of the spindle generally only three years, the cost of replacement of a spindle is 1/3 of the whole machine.

(2) high speed machining using CNC cutting tools mainly rely on imports, and purchase cost is very high.

(3) processing technology demand is higher, improper cutting amount will bring great damage to the tool. If equipment use undeserved, tool selection is not appropriate, not only cannot give full play to the performance of the equipment, tooling (including blade) will be a lot of scrap, lead to cost increase, a huge waste.

(4) CNC high speed machining equipment for processing program staff requirements. At present, the machining program compiled by the operator, the operator's technical level, understanding of parts material knowledge level is uneven, processing hardness of selecting the cutting tool and cutting parameters caused by the difference is bigger.

(5) processing preparation cycle is longer than the other.

(6) affordable maintenance maintenance.

Application of CNC high speed machining equipment effectively

If you think to purchase CNC high speed machining machine tool, can achieve efficient production, actually otherwise, because a lot and cannot be used to optimize nc high speed, except for some technical reasons, the cognitive deviation and method of use undeserved, also for the role of play a negative impact, if all the product processing process on CNC high speed machining machine tool, and the results instead, caused the waste processing equipment. The author after investigation research, the practice is more successful at home and abroad, CNC high-speed processing machine tools and CNC machining center, general machine tools, copy milling machine supporting the use, play to their respective processing advantage, in order to achieve the optimal processing system, the most effective operation. For example using ordinary machine tools or copying milling machine cutting quantity (cutting), do most of the remaining 2 ~ 3 mm allowance is by rapid nc high speed, high efficiency, high quality finish. It has many advantages: ordinary heavy cutting machine is common, processing cost is low; Processing capacity is big, accuracy is not high to achieve; Cutting tool is cheap; High speed cutting, CNC high speed machine tool for processing object is close to forming, cutting the amount is relatively uniform, Save the polishing and grinding link with time, the processing parts can be up to a mirror effect of the surface finish, surface integrity is also very good; Cooperate with precise dimension; Although the high-speed machining cutting tool is more expensive, but the processing time is short, cutting the amount is not large, cost-effective. So, the company combining with the characteristics of product, appropriate equipment, CNC high speed machining equipment of the specific processing property of high precision, high efficiency, high quality, in order to achieve high efficiency and high precision, low cost of product manufacturing.

Now countries encourage the combination of production, use, strengthen the research and development and the achievement transformation of science and technology, aviation industry is undergoing profound changes and important transformation, west point as catic industrial enterprises, the company in enhancing the application level of CNC high speed machining technology, how to give full play to the advantages and role? Indeed, domestic CNC high speed machining equipment and technology level compared with the machine tool in developed countries, there is still a certain gap, increase aviation products CNC high speed machining technology application level, the company scientific research and technology experts, personnel, equipment and tool management responsibility. And integrating production units, the research of CNC high speed machining equipment, and process test research, the cutting tool research, integrated system technology integration and related technical training, etc.

Give full play to the role of the numerical control high-speed cutting

Broaden the scope of high speed cutting parts material and the high speed cutting technology, aviation products cutting process database is established. Development of high speed machining programming technology, promotion of high speed machining technology, dry (must) dry cutting, green manufacturing technology actively to establish perfect mechanism of popularization and application.

For aviation products commonly used materials, such as aluminum alloy, titanium alloy, stainless steel, nickel-based high-temperature alloy material such as experimental study on cutting process, set up relevant material of high speed cutting database, carry out high-speed cutting state monitoring, collecting information, continue to improve.

Strengthen the company aviation product research of high-speed machining manufacturing process specification. According to requirements of GJB9001A quality management system document for new product development process of the regulation and standard development process, in guarantee under the premise of qualified aviation product parts and components assembly, in the course of the development of assembly test for trial and test. From the Angle of the equipment, CNC high speed machining equipment as the core, low processing equipment, high comprehensive characteristics of the equipment, developing new research process diagrams and roadmap, machining process to reduce costs, improve efficiency, the development and production of good quality, high precision, product assembly performance and stable development process file system.

In CNC high speed machining of technical support and personnel training, CNC high speed machining technology for effective application in aviation products of the company to cultivate technical talents of high quality.

conclusion

Numerical control high-speed cutting tools and related technologies is the realization of the basic condition of CNC high speed machining, CNC high speed cutting technology is advanced manufacturing technology, application of nc high speed cutting technology not only can greatly improve machining efficiency and quality, reduce costs, but also can lead to the development of a series of new and high technology industries. Strengthen numerical control high-speed cutting the basic research of nc cutting tool material, tool structure, establish a complete process parameters table, nc high speed cutting and CNC high speed cutting database security technology standard, the CNC high-speed on-line monitoring system, CNC high speed dynamic balance of tools such as research, combined with the actual situation of aviation materials processing, based on the existing tooling design and manufacturing capabilities, advanced experience at home and abroad for reference, to speed up the numerical control high-speed cutting tool system, numerical control high-speed cutting machine system research and development, to further raise the level of aviation company nc machining technology.