High-speed machining is an advanced manufacturing technology, different from the traditional processing methods. The spindle speed, cutting feed rate, cutting a small amount of units within the time of removal of material has increased three to six times. With high efficiency, high precision and high quality surface as the basic characteristics of the automobile industry, aerospace, mold manufacturing and instrumentation industry, such as access to a wide range of applications, has made significant economic benefits, is the contemporary importance of advanced manufacturing technology. For a long time, people die on the processing has been using a grinding or milling EDM (EDM) processing, grinding, polishing methods. Although the high hardness of the EDM machine parts, but the lower the productivity of its application is limited. With the development of high-speed processing technology, used to replace high-speed cutting, grinding and polishing process to die processing has become possible. To shorten the processing cycle, processing and reliable quality assurance, lower processing costs.
1 One of the advantages of high-speed machining
High-speed machining as a die-efficient manufacturing, high-quality, low power consumption in an advanced manufacturing technology. In conventional machining in a series of problems has plagued by high-speed machining of the application have been resolved.
1.1 Increase productivity
High-speed cutting of the spindle speed, feed rate compared withtraditional machining, in the nature of the leap, the metal removal rate increased 30 percent to 40 percent, cutting force reduced by 30 percent, the cutting tool life increased by 70% . Hardened parts can be processed, a fixture in many parts to be completed rough, semi-finishing and fine, and all other processes, the complex can reach parts of the surface quality requirements, thus increasing the processing productivity and competitiveness of products in the market.
1.2 Improve processing accuracy and surface quality
High-speed machines generally have high rigidity and precision, and other characteristics, processing, cutting the depth of small, fast and feed, cutting force low, the workpiece to reduce heat distortion, and high precision machining, surface roughness small. Milling will be no high-speed processing and milling marks the surface so that the parts greatly enhance the quality of the surface. Processing Aluminum when up Ra0.40.6um, pieces of steel processing at upto Ra0.2 ~ 0.4um.
High-speed machining is an advanced manufacturing technology, different from the traditional processing methods. The spindle speed, cutting feed rate, cutting a small amount of units within the time of removal of material has increased three to six times. With high efficiency, high precision and high quality surface as the basic characteristics of the automobile industry, aerospace, mold manufacturing and instrumentation industry, such as access to a wide range of applications, has made significant economic benefits, is the contemporary importance of advanced manufacturing technology. For a long time, people die on the processing has been using a grinding or milling EDM (EDM) processing, grinding, polishing methods. Although the high hardness of the EDM machine parts, but the lower the productivity of its application is limited. With the development of high-speed processing technology, used to replace high-speed cutting, grinding and polishing process to die processing has become possible. To shorten the processing cycle, processing and reliable quality assurance, lower processing costs.
1 One of the advantages of high-speed machining
High-speed machining as a die-efficient manufacturing, high-quality, low power consumption in an advanced manufacturing technology. In conventional machining in a series of problems has plagued by high-speed machining of the application have been resolved.
1.1 Increase productivity
High-speed cutting of the spindle speed, feed rate compared withtraditional machining, in the nature of the leap, the metal removal rate increased 30 percent to 40 percent, cutting force reduced by 30 percent, the cutting tool life increased by 70% . Hardened parts can be processed, a fixture in many parts to be completed rough, semi-finishing and fine, and all other processes, the complex can reach parts of the surface quality requirements, thus increasing the processing productivity and competitiveness of products in the market.
1.2 Improve processing accuracy and surface quality
High-speed machines generally have high rigidity and precision, and other characteristics, processing, cutting the depth of small, fast and feed, cutting force low, the workpiece to reduce heat distortion, and high precision machining, surface roughness small. Milling will be no high-speed processing and milling marks the surface so that the parts greatly enhance the quality of the surface. Processing Aluminum when up Ra0.40.6um, pieces of steel processing at upto Ra0.2 ~ 0.4um.
1.3 Cutting reduce the heat
Because the main axis milling machine high-speed rotation, cutting a shallow cutting, and feed very quickly, and the blade length of the workpiece contacts and contact time is very short, a decrease of blades and parts of the heat conduction. High-speed cutting by dry milling or oil cooked up absolute (mist) lubrication system, to avoid the traditional processing tool in contact with the workpiece and a lot of shortcomings to ensurethat the tool is not high temperature under the conditions of work, extended tool life.
1.4 This is conducive to processing thin-walled parts
High-speed cutting of small cutting force, a higher degree of stability, Machinable with high-quality employees compared to the company may be very good, but other than the company's employees may Suanbu Le outstanding work performance. For our China practice, we use the models to determine the method of staff training needs are simple and effective. This study models can be an external object, it can also be a combination of internal and external. We must first clear strategy for the development of enterprises. Through the internal and external business environment and organizational resources, such as analysis, the future development of a clear business goals and operational priorities. According to the business development strategy can be compared to find the business models, through a comparative analysis of the finalization of business models. In determining business models, a, is the understanding of its development strategy, or its market share and market growth rate, or the staff of the situation, and so on, according to the companies to determine the actual situation. As enterprises in different period of development, its focus is different, which means that enterprises need to invest the manpower and financial resources the focus is different. So in a certain period of time, enterprises should accurately selected their business models compared with the departments and posts, so more practical significance, because the business models are not always good, but to compare some aspects did not have much practical significance, Furthermore This can more fully concentrate on the business use of limited resources. Identify business models, and then take the enterprise of the corresponding departments and staff with the business models for comparison, the two can be found in the performance gap, a comparative analysis to find rea
sons, in accordance with this business reality, the final identification of training needs. The cost of training is needed, if not through an effective way to determine whether companies need to train and the training of the way, but blind to training, such training is difficult to achieve the desired results. A comparison only difference between this model is simple and practical training.
1.5 Can be part of some alternative technology, such as EDM, grinding high intensity and high hardness processing
High-speed cutting a major feature of high-speed cutting machine has the hardness of HRC60 parts. With the use of coated carbide cutter mold processing, directly to the installation of a hardened tool steel processing forming, effectively avoid the installation of several parts of the fixture error and improve the parts of the geometric location accuracy. In the mold of traditional processing, heat treatment hardening of the workpiece required EDM, high-speed machining replace the traditional method of cutting the processing, manufacturing process possible to omit die in EDM, simplifying the processing technology and investment costs .
High-speed milling in the precincts of CNC machine tools, or for processing centre, also in the installation of high-speed spindle on the general machine tools. The latter not only has the processing capacity of general machine tools, but also for high-speed milling, a decrease of investment in equipment, machine tools increased flexibility. Cutting high-speed processing can improve the efficiency, quality improvement, streamline processes, investment and machine tool investment and maintenance costs rise, but comprehensive, can significantly increase economic efficiency.
2 High-speed milling
High-speed milling the main technical high-speed cutting technology is cutting the development direction of one of it with CNC technology, microelectronic technology, new materials and new technology, such as technology development to a higher level. High-speed machine tools and high-speed tool to achieve high-speed cutting is the prerequisite and basic conditions, in high-speed machining in the performance of high-speed machine tool material of choice and there are strict requirements.
2.1 High-speed milling machine in order to achieve high-speed machining
General use of highly flexible high-speed CNC machine tools, machining centers, and some use a dedicated high-speed milling, drilling. At the same time a high-speed ma
chine tool spindle system and high-speed feeding system, high stiffness of the main characteristics of high-precision targeting and high-precision interpolation functions, especially high-precision arc interpolation function. High-speed machining systems of the machine a higher demand, mainly in the following areas:
General use of highly flexible high-speed CNC machine tools, machining centers, and some use a dedicated high-speed milling, drilling. At the same time a high-speed machine tool spindle system and high-speed feeding system, high stiffness of the main characteristics of high-precision targeting and high-precision interpolation functions, especially high-precision arc interpolation function. High-speed machining systems of the machine a higher demand, mainly in the following areas:
High-speed milling machine must have a high-speed spindle, the spindle speed is generally 10000 ~ 100000 m / min, power greater than 15 kW. But also with rapid speed or in designated spots fast-stopping performance. The main axial space not more than 0 .0 0 0 2 m m. Often using high-speed spindle-hydrostatic bearings, air pressure-bearing, mixed ceramic bearings, magnetic bearing structure of the form. Spindle cooling general use within the water or air cooled.
High-speed processing machine-driven system should be able to provide 40 ~ 60 m / min of the feed rate, with good acceleration characteristics, can provide 0.4 m/s2 to 10 m/s2 acceleration and deceleration. In order to obtain goodprocessing quality, high-speed cutting machines must have a high enough stiffness. Machine bed material used gray iron, can also add a high-damping base of concrete, to prevent cutting tool chatter affect the quality of processing. A high-speed data transfer rate, can automatically increase slowdown. Processing technology to improve the processing and cutting tool life. At present high-speed machine tool manufacturers, usually in the general machine tools on low speed, the feed of the rough and then proceed to heat treatment, the last in the high-speed machine on the half-finished and finished, in improving the accuracy and efficiency at the same time, as far as possible to reduce processing Cost.
2.2 High-speed machining tool
High-speed machining tool is the most active one of the important factors, it has a direct impact on the efficiency of processing, manufacturing costs and product processing and accuracy. Tool in high-speed processing to bear high temperature, high
pressure, friction, shock and vibration, such as loading, its hardness and wear-resistance, strength and toughness, heat resistance, technology and economic performance of the basic high-speed processing performance is the key One of the factors. High-speed cutting tool technology development speed, the more applications such as diamond (PCD), cubic boron nitride (CBN), ceramic knives, carbide coating, (C) titanium nitride Carbide TIC (N) And so on. CBN has high hardness, abrasion resistance and the extremely good thermal conductivity, and iron group elements between the great inertia, in 1300 ℃ would not have happened significant role in the chemical, also has a good stability. The experiments show that with CBN cutting tool
HRC35 ~ 67 hardness of hardened steel can achieve very high speed. Ceramics have good wear resistance and thermal chemical stability, its hardness, toughness below the CBN, can be used for processing hardness of HRC <5 0 parts. Carbide Tool good wear resistance, but the hardness than the low-CBN and ceramics. Coating technology used knives, cutting tools can improve hardness and cutting the rate, for cutting HRC40 ~ 50 in hardness between the workpiece. Can be used to heat-resistant alloys, titanium alloys, hightemperature alloy, cast iron, Chungang, aluminum and composite materials of high-speed cutting Cut, the most widely used. Precision machining non-ferrous metals or non-metallic materials, or the choice of polycrystalline diamond Gang-coated tool.
2.3 High-speed processing technology
High-speed cutting technology for high-speed machining is the key. Cutting Methods misconduct, will increase wear tool to less than high-speed processing purposes. Only high-speed machine tool and not a good guide technology, high-speed machining equipment can not fully play its role. In high-speed machining, should be chosen with milling, when the milling cutter involvement with the workpiece chip thickness as the greatest, and then gradually decreased. High-speedmachining suitable for shallow depth of cut, cutting depth of not more than 0.2 mm, to avoid the location of deviation tool to ensure that the geometric precision machining parts. Ensure that the workpiece on the cutting constant load, to get good processing quality. Cutting a single high-speed milling path-cutting mode, try not to interrupt the process and cutting tool path, reducing the involvement tool to cut the number to be relatively stable cutting process. Tool to reduce the
rapid change to, in other words when the NC machine tools must cease immediately, or Jiangsu, and then implement the next step. As the machine tool acceleration restrictions, easy to cause a waste of time, and exigency stop or radical move would damage the surface accuracy. In the mold of high-speed finishing, in each Cut, cut to the workpiece, the feed should try to change the direction of a curve or arc adapter, avoid a straight line adapter to maintain the smooth process of cutting.
3 Die in high-speed milling processing of
Milling as a highly efficient high-speed cutting of the new method,in
Mould Manufacturing has been widely used. Forging links in the regular production model, with EDM cavity to be 12 ~ 15 h, electrodes produced 2 h. Milling after the switch to high-speed, high-speed milling cutter on the hardness of HRC 6 0 hardened tool steel processing. The forging die processing only 3 h20min, improve work efficiency four to five times the processing surface roughness of Ra0.5 ~ 0.6m, fully in line with quality requirements.
High-speed cutting technology is cutting technology one of the major developments, mainly used in automobile industry and die industry, particularly in the processing complex surface, the workpiece itself or knives rigid requirements of the higher processing areas, is a range of advanced processing technology The integration, high efficiency and high quality for the people respected. It not only involves high-speed processing technology, but also including high-speed processing machine tools, numerical control system, high-speed cutting tools and CAD / CAM technology. Die-processing technology has been developed in the mold of the manufacturing sector in general, and in my application and the application of the standards have yet to be improved, because of its traditional processing with unparalleled advantages, the future will continue to be an inevitable development of processing technology Direction.
高速切削加工是一種先進(jìn)制造技術(shù)，不同于傳統(tǒng)加工方式，
[外文翻譯]High-speed milling——高速銑削
，工程
《[外文翻譯]High-speed milling——高速銑削》(http://clearvueentertainment.com)。它的主軸轉(zhuǎn)速高、切削進(jìn)給速度高、切削量小，單位時(shí)間內(nèi)的材料切除量卻增加3～6 倍。它以高效率、高精度和高表面質(zhì)量為基本特征，在汽車(chē)工業(yè)、航空航天、模具制造和儀器儀表等行業(yè)中獲得了廣泛的應(yīng)用，取得了重大的經(jīng)濟(jì)效益，是當(dāng)代先進(jìn)制造技術(shù)的重要應(yīng)用。長(zhǎng)期以來(lái)，人們對(duì)模具的加工一直采用銑削一磨削或者電火花(EDM)加工、打磨、拋光的方法。雖然電火花可加工硬度很高的工件，但較低的生產(chǎn)率使它的應(yīng)用受到制。隨著高速加工技術(shù)的發(fā)展，采用高速切削取代磨削拋光和電加工進(jìn)行模具加工已成為可能。使加工周期大為縮短，加工質(zhì)量得到可靠保證，加工成本降低。
1 高速切削加工的優(yōu)勢(shì)
高速切削加工作為模具制造中集高效、優(yōu)質(zhì)、低耗于一身的先進(jìn)制造技術(shù)。在常規(guī)切削加工中備受困擾的一系列問(wèn)題，通過(guò)高速切削加工的應(yīng)用得到了解決。
1.1 提高生產(chǎn)率
高速切削的主軸轉(zhuǎn)速、進(jìn)給速度與傳統(tǒng)切削加工相比，發(fā)生了本質(zhì)性的飛躍，其金屬切除率提高了30%~40%，切削力降低了30%，刀具的切削壽命提高了70%。還可加工淬硬零件，許多零件一次裝夾可完成粗、半精和精加工等全部工序，對(duì)復(fù)雜型面也能達(dá)到零件表面質(zhì)量要求，進(jìn)而提高了加工生產(chǎn)率和產(chǎn)品的市場(chǎng)競(jìng)爭(zhēng)力。
1.2 改善加工精度和表面質(zhì)量
高速機(jī)床普遍具備高剛性和高精度等特點(diǎn)，加工時(shí)切削深度小，而進(jìn)給速度較快，切削力低，工件熱變形減少，而加工精度很高，表面粗糙度很小。高速銑削可獲得無(wú)銑痕的加工表面，使零件表面質(zhì)量大大提高。加工鋁合金時(shí)可達(dá)Ra0.40.6um，加工鋼件時(shí)可達(dá)Ra0.2～0.4um。
1.3 減少切削產(chǎn)生的熱量
因?yàn)殂姶仓鬏S高速旋轉(zhuǎn)，切削加工是淺切削，同時(shí)進(jìn)給速度很快，刀刃和工件的接觸長(zhǎng)度和接觸時(shí)間非常短，減少了刀刃和工件的熱傳導(dǎo)。高速切削采用干銑或油一氣(油霧)潤(rùn)滑系統(tǒng)，避免了傳統(tǒng)加工時(shí)在刀具和工件接觸處產(chǎn)生大量熱的缺點(diǎn)，保證刀具在溫度不高的條件下工作，延長(zhǎng)了刀具的使用壽命。
1.4 有利于加工薄壁零件
高速切削時(shí)的切削力小，有較高的穩(wěn)定性，可加工高質(zhì)量同本公司內(nèi)部員工相比可能是非常優(yōu)秀的，但是同其他的公司的員工相比工作績(jī)效可能算不了優(yōu)秀。就我們中國(guó)實(shí)際來(lái)說(shuō)，我們使用標(biāo)桿分析法來(lái)確定員工培訓(xùn)需求是簡(jiǎn)單有效的。這種學(xué)習(xí)標(biāo)桿對(duì)象可以是外部的，也可以是內(nèi)部和外部的結(jié)合。首先要明確企業(yè)的發(fā)展戰(zhàn)略。通過(guò)對(duì)企業(yè)內(nèi)外部環(huán)境和組織資源等分析，明確企業(yè)未來(lái)發(fā)展的目標(biāo)和業(yè)務(wù)重點(diǎn)。根據(jù)企業(yè)的發(fā)展戰(zhàn)略尋找可以比照的標(biāo)桿企業(yè)，通過(guò)比較分析，最后確定標(biāo)桿企業(yè)。在確定標(biāo)桿企業(yè)后，有一項(xiàng)，是了解其發(fā)展戰(zhàn)略，還是其市場(chǎng)占有率和市場(chǎng)增長(zhǎng)率，還是員工各方面的情況等等，這要根據(jù)本企業(yè)的實(shí)際情況來(lái)確定。由于企業(yè)在不同的發(fā)展時(shí)期，其著力點(diǎn)是不同的，即企業(yè)需要投入的物力人力財(cái)力的重點(diǎn)是不同的。所以在一定的時(shí)期內(nèi)，企業(yè)要準(zhǔn)確地選定其跟標(biāo)桿企業(yè)比較的部門(mén)和崗位，這樣更加具有實(shí)際意義，因?yàn)闃?biāo)桿企業(yè)并不是處處都好，而且有些方面進(jìn)行比較沒(méi)有多少實(shí)際意義，再者這樣可以更充分地集中利用企業(yè)的有限資源。確定標(biāo)桿企業(yè)后，然后拿本企業(yè)的相應(yīng)的部門(mén)和員工同標(biāo)桿企業(yè)進(jìn)行比較，可以發(fā)現(xiàn)兩者在工作績(jī)效的差距，比較分析，尋找原因，根據(jù)本企業(yè)的實(shí)際，最后確定培訓(xùn)需求。培訓(xùn)是需要成本的，如果沒(méi)有通過(guò)有效的方式，去確定企業(yè)是否需要培訓(xùn)以及培訓(xùn)的方式，而是盲目進(jìn)行培訓(xùn)，這樣的培訓(xùn)是難以取得預(yù)期的效果。有比較才有區(qū)別，這種培訓(xùn)分析模型簡(jiǎn)單實(shí)用。
1.5 可部分替代某些工藝，如電火花加工、磨削加工
高速切削的一大特點(diǎn)，高速切削已可加工硬度達(dá)HRC60 的零件。采用帶涂層的硬質(zhì)合金刀具加工模具，直接將淬硬工具鋼一次安裝加工成形，有效地避免了零件多次安裝造成的裝
夾誤差，提高了零件的幾何位置精度。在傳統(tǒng)加工模具的工藝中，對(duì)熱處理硬化后的工件需進(jìn)行電火花加工，用高速切削加工替代傳統(tǒng)切削的加工方法，可以省去模具制造工藝中的電火花加工，簡(jiǎn)化了加工工藝和投資成本。高速銑削加工可在專(zhuān)用的CNC 機(jī)床或加工中心上進(jìn)行，也可在加裝高速主軸的普通機(jī)床上進(jìn)行。后者不僅具有普通機(jī)床的加工能力，而且還可進(jìn)行高速銑削，減少了設(shè)備投資，增加了機(jī)床柔性。高速切削可以使加工效率提高、質(zhì)量提高、工序簡(jiǎn)化，機(jī)床投資和刀具投資及維護(hù)費(fèi)用上升，但綜合比較，可以顯著提高經(jīng)濟(jì)效益。
2 高速銑削加工
高速銑削加工的主要技術(shù)高速切削技術(shù)是切削加工技術(shù)的發(fā)展方向之一，它隨著C N C 技術(shù)、微電子技術(shù)、新材料和新工藝等技術(shù)的發(fā)展而邁上更高的臺(tái)階。高速機(jī)床和高速刀具是實(shí)現(xiàn)高速切削的前提和基本條件，在高速切削加工中對(duì)高速機(jī)床的性能和刀具材料的選擇有嚴(yán)格的要求。
2.1 高速銑削加工機(jī)床為了實(shí)現(xiàn)高速切削加工
一般采用高柔性的高速數(shù)控機(jī)床、加工中心，也有的采用專(zhuān)用的高速銑、鉆床。機(jī)床同時(shí)具有高速主軸系統(tǒng)和高速進(jìn)給系統(tǒng)，高的主軸剛度特性，高精度定位功能和高精度插補(bǔ)功能，特別是圓弧高精度插補(bǔ)功能。高速切削加工對(duì)機(jī)床的工藝系統(tǒng)提出了更高的要求，主要表現(xiàn)在以下幾個(gè)方面：
高速銑削機(jī)床必須具有高速主軸，主軸的轉(zhuǎn)速10000~100000m/min，功率大于15kW。還應(yīng)具有快速升速、在指定位置快速準(zhǔn)停的性能。主軸的軸向間隙不大于0 .0 0 0 2 m m 。高速主軸常采用液體靜壓軸承式、空氣靜壓軸承式、混合陶瓷軸承、磁懸浮軸承式等結(jié)構(gòu)形式。主軸冷卻一般采用內(nèi)部水冷或氣冷。
高速加工機(jī)床的驅(qū)動(dòng)系統(tǒng)應(yīng)能夠提供40～60m/min 的進(jìn)給速度，具有良好的加速度特性，能夠提供0.4m/s2 到10m/s2的加速度和減速度。為了獲得良好的加工質(zhì)量，高速切削機(jī)床必須具有足夠高的剛度。機(jī)床床身材料采用灰鑄鐵，還可以在底座中添加高阻尼特性的混凝土，以防止切削時(shí)刀具顫振影響加工質(zhì)量。具有高速數(shù)據(jù)傳輸率，能夠自動(dòng)加減速。加工工藝有利于切削加工和提高刀具壽命。目前高速機(jī)床的廠家，通常在普通機(jī)床上進(jìn)行低速、大進(jìn)給的粗加工，然后進(jìn)行熱處理，最后在高速機(jī)床上進(jìn)行半精加工和精加工，在提高精度和效率的同時(shí)盡可能地降低加工成本。
2.2 高速切削加工刀具
刀具是高速切削加工中最活躍重要的因素之一，它直接影響著加工效率、制造成本和產(chǎn)品的加工精度。刀具在高速加工過(guò)程中要承受高溫、高壓、摩擦、沖擊和振動(dòng)等載荷，因此其硬度和耐磨性、強(qiáng)度和韌性、耐熱性、工藝性能和經(jīng)濟(jì)性等基本性能是實(shí)現(xiàn)高速加工的關(guān)鍵因素之一。高速切削加工的刀具技術(shù)發(fā)展速度很快，應(yīng)用較多的如金剛石(P C D)、立方氮化硼(C B N)）、陶瓷刀具、涂層硬質(zhì)合金、(碳)氮化鈦硬質(zhì)合金T I C (N)等。立方氮化硼具有很高的硬度、極強(qiáng)的耐磨性和良好的導(dǎo)熱性，與鐵族元素之間有很大的惰性，在1300℃也不會(huì)發(fā)生顯著的化學(xué)作用，還具有良好的穩(wěn)定性。實(shí)驗(yàn)表明，用CBN 刀具切削硬度HRC35～67 的淬火鋼可以達(dá)到很高速度。陶瓷材料具有良好的耐磨性和熱化學(xué)穩(wěn)定性，其硬度、韌性低于C B N ，可用于加工硬度H R C < 5 0 的零件。硬質(zhì)合金刀具耐磨性好，但硬度比立方氮化硼和陶瓷低。采用刀具涂層技術(shù)，可以提高刀具硬度和切削加工的速度，適合切削硬度在HRC40～50 之間的工件。可用于耐熱合金、鈦合金、高溫合金、鑄鐵、純鋼、鋁合金及復(fù)合材料的高速切削，應(yīng)用最為廣泛。精密加工有色金屬或非金屬材料時(shí)，選用聚晶金剛石或金剛石涂層刀具。
2.3 高速加工工藝
高速切削的工藝技術(shù)也是進(jìn)行高速切削加工的關(guān)鍵。切削方法選擇不當(dāng)，會(huì)使刀具加劇磨損，達(dá)不到高速加工的目的。只有高速機(jī)床和刀具沒(méi)有好的工藝技術(shù)指導(dǎo)，高速切削加工設(shè)備也不能充分發(fā)揮作用。在高速切削加工中，應(yīng)盡量選用順銑加工，順銑時(shí)刀具切入工件的切屑厚度為最大，隨后逐漸減小。高速切削加工適于淺的切深，切削深度不超過(guò)0.2mm，可避免刀具的位置偏差，確保加工零件的幾何精度。保證工件上的切削載荷恒定，以獲得好的加工質(zhì)量。高速切削采用單一路徑順銑切削模式，盡量不中斷切削過(guò)程和刀具路徑，減少刀具的切入切出次數(shù)，以獲得相對(duì)穩(wěn)定的切削過(guò)程。減少刀具的急速換向，在換向時(shí)NC機(jī)床必須立即停止或降速，再執(zhí)行下一步操作。由于機(jī)床的加速度限制，易造成時(shí)間浪費(fèi)，而且急�；蚣眲�(dòng)會(huì)破壞表面精度。在模具的高速精加工中，在每次切入、切出工件時(shí)，進(jìn)給方向的改變應(yīng)盡量采用圓弧或曲線轉(zhuǎn)接，避免采用直線轉(zhuǎn)接，以保持切削過(guò)程的平穩(wěn)性。
3 高速銑削在模具加工中的應(yīng)用
高速銑削作為高效切削加工的新方法，在模具制造中得到了廣泛應(yīng)用。在常規(guī)生產(chǎn)連桿鍛模時(shí)，用電火花加工型腔需12～15h，電極制作2h。改用高速銑削后，采用高速立銑刀對(duì)硬度H R C 6 0 的淬硬工具鋼進(jìn)行加工。整個(gè)鍛模加工只需3h20min，工效提高4～5 倍，加工表面粗糙度達(dá)Ra0.5～0.6m ，質(zhì)量完全符合要求。高速切削技術(shù)是切削加工技術(shù)的主要發(fā)展方向之一，目前主要應(yīng)用于汽車(chē)工業(yè)和模具行業(yè)，尤其是在加工復(fù)雜曲面、工件本身或刀具剛性要求較高的加工領(lǐng)域等，是多種先進(jìn)加工技術(shù)的集成，其高效、高質(zhì)量為人們所推崇。它不僅涉及到高速加工工藝，而且還包括高速加工機(jī)床、數(shù)控系統(tǒng)、高速切削刀具及C A D / C A M 技術(shù)等。模具高速加工技術(shù)目前已在發(fā)達(dá)國(guó)家的模具制造業(yè)中普遍應(yīng)用，而在我國(guó)的應(yīng)用范圍及應(yīng)用水平仍有待提高，由于其具有傳統(tǒng)加工無(wú)可比擬的優(yōu)勢(shì)，仍將是今后加工技術(shù)必然的發(fā)展方向。