【正文】 acturing highlight the advantages of low cost, has been widely apprial applications. (3) it is to harness the production process systems engineering. (4) it is a technology for global petition. (5) it is the unity of the three elements of market petition. However, EDM wire cutting technology is one of advanced manufacturing technology, mechanical production and wide application, it is mainly used for processing a variety of plex shapes and precision small parts, for example, Die punch, die, punch and die, fixed plate, stripper plate and so on, forming cutter, model, EDM machining the metal electrode, a varietylied in production, the current account abroad WEDM EDM over 60% of the total. The following highlights WEDM machining technology and application of principles and development trends. 1. Principles of WEDM WEDM (Wire cut Electrical Discharge Machining, referred to as the WEDM), sometimes also known as cutting. The basic physical principle is the presence of free positive ions and electrons to accumulate, and soon to be ionized to form a conductive channel. In this stage, a current between two plates, lead to numerous collisions between particles occur, forming a plasma, and soon increased to 8000 to 12,000 degrees Celsius, melting moments in the two conductors, some of the material at the same time, the electrode and dielectric fluid vaporized, forming a bubble, the rules and it increased until the pressure is very high. And current interruption, the temperature suddenly drop, causing the bubble implosion, the momentum generated to melt the material thrown into the crater, and then the material is corrosive fluid in the dielectric recondensed into a small ball, and was discharged dielectric fluid. NCcontrolled then the monitoring and control, servo bodies, so that the phenomenon of uniform discharge to achieve the processing of materials to be processed, making it meet the requirements of size and shape precision products. On this basis, our domestic development of the Fast Wire System (HS). Europe and Japan, developed the walking system (LS). The main difference is 1, the electrode wire of tungsten and molybdenum alloy wire used, the foreign use of brass. 2, by specification of the working fluid, demonized water used abroad. 3, take the wire of the speed of 11 meters / second or so, abroad for 3 to 5 m / min. 4, we repeat the electrode wire is to use until the broken wire to the foreign is not reused after the walk. 5, our precision than in other countries. According to the electrode wire running at different speeds, and processing quality of different WEDM is usually divided into three categories: the first is to go wire speed WEDM (WEDMHS), the electrode wire for highspeed reciprocating motion, generally take the wire speed of 8 ~ 10m / s, the electrode wire can be reused, the higher processing speed, rapid walking easily lead to the electrode wire and reverse wire jitter when the pause, the decline in the quality process is the production and use of the main machine species, but also our unique WEDM model。 the other is the optical tracking control, the conducting wire cutting before amplification under a certain percentage of part drawings depict an optical tracking map, the processing machine will be placed in optical pattern tracing stage, the stage of the optical head tracking to follow the ink line graph is always trajectory, then by means of electrical, mechanical linkage, the control machine table with the workpiece relative to the movement of the electrode wire to do similar figures to cut out shapes with the same pattern to the workpiece。 size precision can reach 177。 關(guān)鍵詞：機(jī)械制造技術(shù)， 電火花線切割 0 緒 言 制造技術(shù)不僅是衡量一個(gè)國家科技發(fā)展水平的重要標(biāo)志 ,也是國際間科技競(jìng)爭(zhēng)的重點(diǎn)。（ 2）是面向工業(yè)應(yīng)用的技術(shù)。 然而電火花線切割技 術(shù)是先進(jìn)制造技術(shù)之一，在機(jī) 械生產(chǎn)中應(yīng)用范圍廣，它主要用于加工各種形狀復(fù)雜和精密細(xì)小的工件，例如沖裁模的凸模、凹模、凸凹模、固定板、卸料板等，成形刀具、樣板、電火花成型加工用的金屬電極，各種微細(xì)孔槽、窄縫、任意曲線等，具有加工余量小、加工精度高、生產(chǎn)周期短、制造成本低等突出優(yōu)點(diǎn)，已在生產(chǎn)中獲得廣泛的應(yīng)用，目前國內(nèi)外的電火花線切割機(jī)床已占電加工機(jī)床總數(shù)的 60％以上。在這個(gè)階段，兩板間形成電流。 我們國內(nèi)在此基礎(chǔ)上發(fā)展了快走絲系統(tǒng) (HS)。 我國的走絲速度為 11 米 /秒左右 ， 國外為3~5 米 /分 。第三類中速走絲電火花線切 割機(jī)床，準(zhǔn)確地應(yīng)該叫 “多速走絲 ”。 2 電火花線切割加工的特點(diǎn)與應(yīng)用 所謂電火花線切割，就是以移動(dòng)著的細(xì)絲（直徑約在 以內(nèi)）做電極，在電極絲與工件之間產(chǎn)生火花放電，并同時(shí)按所要求的形狀驅(qū)動(dòng)工件進(jìn)行加工。 （ 4）可無視電極絲損耗（高速走絲切割采用低損耗脈沖電源；慢速走絲線切割采用單向連續(xù)供絲，在加工區(qū)總是保持新電極絲加工），加工精度高 （ 5）依靠微型計(jì)算機(jī)控制電極絲軌跡和間隙補(bǔ)償功能，同時(shí)加工凹凸兩種模具時(shí)，間隙可任意調(diào)節(jié)。 （ 9） 采用四軸聯(lián)動(dòng)，可加工上，下面異形體，形狀扭曲曲面體，變錐度和球形等零件。 電火花線切割加工的應(yīng)用 ： （ 1） 試制新產(chǎn)品 ： 在新產(chǎn)品開發(fā)過程中需要單件的樣品，使用線切割直接切割出零件，無需模具，這樣可以大大縮短新產(chǎn)品的開發(fā)周期并降低試制成本。例如，中小型沖模，材料為模具鋼，過去用分開模和曲線磨削的方法加工，現(xiàn)在改用電火花線切割整體加工的方法，制造周期可縮短 3/4~5/4，成本降低 2/3~3/4，配合精度高，不需要熟練的操作工作。廣泛用于電子儀器、精密機(jī)床、輕工、軍工等。/min，機(jī)床的加工精度為 177。同時(shí)機(jī)床具有數(shù)字自適應(yīng)控制電源、自動(dòng)穿絲、自動(dòng)卸除廢料、短路自動(dòng)回退等自動(dòng)化技術(shù)，此外對(duì)電極絲張力和工作液壓力也可進(jìn)行控制。2 ～ 5μm；表面粗糙度可達(dá)到 ～ (多次切割 )。因此，電火花 線切割機(jī)的發(fā)展策略是揚(yáng)長避短，以