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【摘要】对聚晶金刚çŸ?(PCD)刀å…ïLš„发展概况、性能特点、应用范围、制造技术、设计原则、切削参数及失效机理½{‰è¿›è¡Œäº†¾l¼åˆè¯„è¿°</p> <p align="left">  1åQŽæ¦‚˜q?/p> <p align="left">  1.1 PCD刀å…ïLš„发展</p> <p align="left">  金刚石作ä¸ÞZ¸€¿Uè¶…¼‹¬åˆ€å…ähæ–™åº”用于切削加工已有数百òq´åŽ†åŒÓ€‚在刀具发展历½E‹ä¸­åQŒä»Žåä¹ä¸–纪末到二十世纪中期åQŒåˆ€å…ähæ–™ä»¥é«˜é€Ÿé’¢ä¸ÞZ¸»è¦ä»£è¡¨ï¼›1927òq´å¯d国首先研制出¼‹¬è´¨åˆé‡‘刀å…ähæ–™åƈ获得òq¿æ³›åº”用åQ›äºŒåä¸–¾Uªäº”十年代,瑞典和美国分别合成出人造金刚石åQŒåˆ‡å‰Šåˆ€å…·ä»Žæ­¤æ­¥å…¥ä»¥­‘…硬材料ä¸ÞZ»£è¡¨çš„时期。二十世¾Uªä¸ƒåå¹´ä»£ï¼ŒäºÞZ»¬åˆ©ç”¨é«˜åŽ‹åˆæˆæŠ€æœ¯åˆæˆäº†èšæ™¶é‡‘刚矻I¼ˆPCDåQ‰ï¼Œè§£å†³äº†å¤©ç„‰™‡‘刚石数量½E€ž®‘、ä­h格昂è´ëŠš„问题åQŒä‹É金刚矛_ˆ€å…ïLš„应用范围扩展到航½Iºã€èˆªå¤©ã€æ±½è½¦ã€ç”µå­ã€çŸ³æç­‰å¤šä¸ªé¢†åŸŸã€?/p> <p align="center"><img border="0" alt="" src="http://www.hnrztcm.com/upfile/201408/201408180818308750_1.jpg" /></p> <p align="left">1.2 PCD刀å…ïLš„性能特点</p> <p align="left">  金刚矛_ˆ€å…·å…·æœ‰ç¡¬åº¦é«˜ã€æŠ—压强度高、导热性及耐磨性好½{‰ç‰¹æ€§ï¼Œå¯åœ¨é«˜é€Ÿåˆ‡å‰Šä¸­èŽ·å¾—很高的加工精度和加工效率。金刚石刀å…ïLš„上述ç‰ÒŽ€§æ˜¯ç”±é‡‘刚石晶体状态决定的。在金刚çŸÏx™¶ä½“中åQŒç¢³åŽŸå­çš„四个ä­h电子按四面体¾l“构成键åQŒæ¯ä¸ªç¢³åŽŸå­ä¸Žå››ä¸ªç›¸é‚ÕdŽŸå­åŞ成共价键åQŒè¿›è€Œç»„成金刚石¾l“æž„åQŒè¯¥¾l“构的结合力和方向性很强,从而ä‹É金刚矛_…·æœ‰æžé«˜ç¡¬åº¦ã€‚由于聚晉™‡‘刚石åQˆPCDåQ‰çš„¾l“构是取向不一的细晶粒金刚石烧¾l“体åQŒè™½ç„¶åŠ å…¥äº†¾l“合剂,其硬度及耐磨性仍低于单晶金刚矟뀂但ç”׃ºŽPCD烧结体表çŽîCؓ各向同性,因此不易沿单一解理面裂开ã€?/p> <p align="left">  PCD刀å…ähæ–™çš„主要性能指标åQ?/p> <p align="left">  ①PCD的硬度可è¾?000HVåQŒäؓ¼‹¬è´¨åˆé‡‘çš?0ï½?20倍;</p> <p align="left">  ②PCD的导热系æ•îCؓ700W/mKåQŒäؓ¼‹¬è´¨åˆé‡‘çš?.5ï½?倍,甚至高于PCBN和铜åQŒå› æ­¤PCD刀å…ïLƒ­é‡ä¼ é€’迅速;</p> <p align="left">  ③PCD的摩擦系æ•îC¸€èˆ¬ä»…ä¸?.1ï½?.3åQˆç¡¬è´¨åˆé‡‘的摩擦¾pÀL•°ä¸?.4ï½?åQ‰ï¼Œå› æ­¤PCD刀具可昄¡€å‡å°åˆ‡å‰ŠåŠ›ï¼›</p> <p align="left">  ④PCD的热膨胀¾pÀL•°ä»…äؓ0.9×10  -6ï½?.18×10 -6åQŒä»…相当于硬质合金的1/5åQŒå› æ­¤PCD刀å…ïLƒ­å˜åޞ®ï¼ŒåŠ å·¥¾_‘Öº¦é«˜ï¼›</p> <p align="left">  ⑤PCD刀具与有色金属和非金属材料间的亲和力很ž®ï¼Œåœ¨åŠ å·¥è¿‡½E‹ä¸­åˆ‡å±‘不易¾_˜ç»“在刀ž®–上形成¿U¯å±‘瘤ã€?/p> <p align="left">  1.3 PCD刀å…ïLš„应用</p> <p align="left">  工业发达国家对PCD刀å…ïLš„研究开展较早,其应用已比较成熟。自1953òq´åœ¨ç‘žå…¸é¦–次合成人造金刚石以来åQŒå¯¹PCD刀具切削性能的研½I¶èŽ·å¾—了大量成果åQŒPCD刀å…ïLš„应用范围及ä‹É用量˜q…速扩大。目前,国际上着名的人造金刚石复合片生产商主要有英国De Beers公司、美国GE公司、日本住友电工株式会½C„¡­‰ã€‚据报道åQ?995òq´ä¸€å­£åº¦ä»…日本的PCD刀具äñ”量即è¾?0.7万把。PCD刀å…ïLš„应用范围已由初期的èžR削加工向é’Õd‰Šã€é“£å‰ŠåŠ å·¥æ‰©å±•ã€‚由日本一家组¾l‡è¿›è¡Œçš„关于­‘…硬刀å…ïLš„调查表明åQšäh们选用PCD刀å…ïLš„主要考虑因素是基于PCD刀具加工后的表面精度、尺寸精度及刀具寿命等优势。金刚石复合片合成技术也得到了较大发展,DeBeers公司已推å‡ÞZº†ç›´å¾„74mm、层åŽ?.3mm的聚晉™‡‘刚石复合片ã€?/p> <p align="center"><img border="0" alt="" src="http://www.hnrztcm.com/upfile/201408/201408180818588906_1.jpg" /></p> <p align="left">PCD复合ç‰?/p> <p align="left">  国内PCD刀具市场随着刀å…ähŠ€æœ¯æ°´òq³çš„发展也不断扩大。目前中国第一汽èžR集团已有一癑֤šä¸ªPCD车刀使用点,许多人造板企业也采用PCD刀兯‚¿›è¡Œæœ¨åˆ¶å“åŠ å·¥ã€‚PCD刀å…ïLš„应用也进一步推动了对其设计与制造技术的研究。国内的清华大学、大˜qžç†å·¥å¤§å­¦ã€åŽä¸­ç†å·¥å¤§å­¦ã€å‰æž—工业大学、哈ž®”滨工业大学½{‰å‡åœ¨ç§¯æžå¼€å±•è¿™æ–šw¢çš„ç ”½I¶ã€‚国内从事PCD刀å…ïL ”发、生产的有上‹¹¯‚ˆ’伯哈牏V€éƒ‘州新亚、南京蓝帜、深åœÏx¶¦¼œ¥ã€æˆéƒ½å·¥å…ïL ”½I¶æ‰€½{‰å‡ åå®¶å•ä½ã€‚目前,PCD刀å…ïLš„加工范围已从传统的金属切削加工扩展到çŸÏxåŠ å·¥ã€æœ¨æåŠ å·¥ã€é‡‘属基复合材料、玻璃、工½E‹é™¶ç“ïL­‰ææ–™çš„加工。通过对近òq´æ¥PCD刀具应用的分析可见åQŒPCD刀具主要应用于以下两方面:</p> <p align="left">  ①难加工有色金属材料的加工:用普通刀具加工难加工有色金属材料æ—Óž¼Œå¾€å¾€äº§ç”Ÿåˆ€å…äh˜“¼‚¨æŸã€åŠ å·¥æ•ˆçŽ‡ä½Ž½{‰ç¼ºé™øP¼Œè€ŒPCD刀具则可表现出良好的加工性能。如用PCD刀具可有效加工新型发动机活塞材æ–?-˜q‡å…±æ™¶ç¡…铝合金(对该材料加工机理的研½I¶å·²å–å¾—½Hç ´åQ‰ã€?/p> <p align="left">  ②难加工非金属材料的加工åQšPCD刀具非帔R€‚合对石材、硬质碳、碳¾U¤ç»´å¢žå¼ºå¡‘æ–™åQˆCFRPåQ‰ã€äh造板材等隑֊ å·¥éžé‡‘属材料的加工。如华中理工大学1990òq´å®žçŽîCº†ç”¨PCD刀具加工玻璃;目前强化复合地板及其它木基板材(如MDFåQ‰çš„应用日趋òq¿æ³›åQŒç”¨PCD刀具加工这些材料可有效避免刀å…äh˜“¼‚¨æŸ½{‰ç¼ºé™—÷€?/p> <p align="left">  2åQŽPCD刀å…ïLš„刉™€ æŠ€æœ?/p> <p align="left">  2.1 PCD刀å…ïLš„刉™€ è¿‡½E?/p> <p align="left">  PCD刀å…ïLš„刉™€ è¿‡½E‹ä¸»è¦åŒ…括两个阶ŒDµï¼š</p> <p align="left">  ①PCD复合片的刉™€ ï¼šPCD复合片是由天然或人工合成的金刚石¾_‰æœ«ä¸Žç»“合剂åQˆå…¶ä¸­å«é’´ã€é•½{‰é‡‘属)按一定比例在高温åQ?000ï½?000℃)、高压(5ï½?0万个大气压)下烧¾l“而成。在烧结˜q‡ç¨‹ä¸­ï¼Œç”׃ºŽ¾l“合剂的加入åQŒä‹É金刚çŸÏx™¶ä½“间形成以TiC、SiC、Fe、Co、Ni½{‰äؓ主要成分的结合桥åQŒé‡‘刚石晶体以共价键形式镶嵌于结合桥的骨架中。通常ž®†å¤åˆç‰‡åˆ¶æˆå›ºå®šç›´å¾„和厚度的圆盘åQŒè¿˜éœ€å¯¹çƒ§¾l“成的复合片˜q›è¡Œç ”磨抛光及其它相应的物理、化学处理ã€?/p> <p align="left">  ②PCD刀片的加工åQšPCD刀片的加工主要包括复合片的切割、刀片的焊接、刀片刃¼‚¨ç­‰æ­¥éª¤ã€?/p> <p align="left">  2.2 PCD复合片的切割工艺</p> <p align="left">  ç”׃ºŽPCD复合片具有很高的¼‹¬åº¦åŠè€ç£¨æ€§ï¼Œå› æ­¤å¿…须采用ç‰ÒŽ®Šçš„加工工艺。目前,加工PCD复合片主要采用电火花¾U¿åˆ‡å‰ŒÓ€æ¿€å…‰åŠ å·¥ã€è¶…声æ‡L加工、高压水ž®„流½{‰å‡ ¿Uå·¥è‰ºæ–¹æ³•ï¼Œå…¶å·¥è‰ºç‰¹ç‚¹çš„比较见表1ã€?/p> <p align="left">  PCD复合片切割工艺的比较</p> <p align="left">  工艺æ–ÒŽ³•åQ?nbsp; 工艺特点</p> <p align="left">  ç”늁«èŠ±åŠ å·¥ï¼é«˜åº¦é›†ä¸­çš„脉冲放电能量、强大的攄¡”µçˆ†ç‚¸åŠ›ä‹ÉPCD材料中的金属融化åQŒéƒ¨åˆ†é‡‘刚石矛_¢¨åŒ–和氧化åQŒéƒ¨åˆ†é‡‘刚石è„Þp½åQŒå·¥è‰ºæ€§å¥½ã€æ•ˆçŽ‡é«˜</p> <p align="left">  ­‘…声波加工-加工效率低,金刚矛_¾®¾_‰æ¶ˆè€—大åQŒç²‰ž®˜æ±¡æŸ“大</p> <p align="left">  ‹È€å…‰åŠ å·¥ï¼éžæŽ¥è§¦åŠ å·¥ï¼Œæ•ˆçŽ‡é«˜ã€åŠ å·¥å˜å½¢å°ã€å·¥è‰ºæ€§å·®</p> <p align="left">  在上˜q°åŠ å·¥æ–¹æ³•ä¸­åQŒç”µç«èŠ±åŠ å·¥æ•ˆæžœè¾ƒä½³ã€‚PCD中结合桥的存在ä‹Éç”늁«èŠ±åŠ å·¥å¤åˆç‰‡æˆäؓ可能。在有工作液的条件下åQŒåˆ©ç”¨è„‰å†²ç”µåŽ‹ä‹É靠近甉|žé‡‘属处的工作液åŞ成放电通道åQŒåƈ在局部äñ”生放ç”늁«èŠ±ï¼Œçž¬é—´é«˜æ¸©å¯ä‹É聚晶金刚石熔化、脱落,从而åŞ成所要求的三角åŞ、长方åŞ或正方åŞ的刀头毛坯。电火花加工PCD复合片的效率及表面质量受到切削速度、PCD¾_’度、层厚和甉|žè´¨é‡½{‰å› ç´ çš„影响åQŒå…¶ä¸­åˆ‡å‰Šé€Ÿåº¦çš„合理选择十分关键åQŒå®žéªŒè¡¨æ˜Žï¼Œå¢žå¤§åˆ‡å‰Šé€Ÿåº¦ä¼šé™ä½ŽåŠ å·¥è¡¨é¢è´¨é‡ï¼Œè€Œåˆ‡å‰Šé€Ÿåº¦˜q‡ä½Žåˆ™ä¼šäº§ç”Ÿâ€œæ‹±ä¸â€çŽ°è±¡ï¼Œòq‰™™ä½Žåˆ‡å‰²æ•ˆçŽ‡ã€‚增加PCD刀片厚度也会降低切割速度ã€?/p> <p align="left">  2.3 PCD刀片的焊接工艺</p> <p align="left">  PCD复合片与刀体的¾l“合方式除采用机械夹固和¾_˜æŽ¥æ–ÒŽ³•å¤–,大多是通过钎焊方式ž®†PCD复合片压制在¼‹¬è´¨åˆé‡‘åŸÞZ½“上。焊接方法主要有‹È€å…‰ç„ŠæŽ¥ã€çœŸ½Iºæ‰©æ•£ç„ŠæŽ¥ã€çœŸ½Iºé’Žç„Šã€é«˜é¢‘感应钎焊等。目前,投资ž®‘、成本低的高频感应加热钎焊在PCD刀片焊接中得到òq¿æ³›åº”用。在刀片焊接过½E‹ä¸­åQŒç„ŠæŽ¥æ¸©åº¦ã€ç„Šå‰‚和焊接合金的选择ž®†ç›´æŽ¥åª„响焊后刀å…ïLš„性能。在焊接˜q‡ç¨‹ä¸­ï¼Œç„ŠæŽ¥æ¸©åº¦çš„控制十分重要,如焊接温度过低,则焊接强度不够;如焊接温度过高,PCDå®ÒŽ˜“矛_¢¨åŒ–,òq¶å¯èƒ½å¯¼è‡´â€œè¿‡çƒ§â€ï¼Œå½±å“PCD复合片与¼‹¬è´¨åˆé‡‘åŸÞZ½“的结合。在实际加工˜q‡ç¨‹ä¸­ï¼Œå¯æ ¹æ®ä¿æ¸©æ—¶é—´å’ŒPCD变红的深‹¹…程度来控制焊接温度åQˆä¸€èˆ¬åº”低于700℃)。国外的高频焊接多采用自动焊接工艺,焊接效率高、质量好åQŒå¯å®žçŽ°˜qžç®‹ç”Ÿäñ”åQ›å›½å†…则多采用手工焊接,生äñ”效率较低åQŒè´¨é‡ä¹Ÿä¸å¤Ÿç†æƒ³ã€?/p> <p align="left">  2.4 PCD刀片的刃磨工艺</p> <p align="left">  PCD的高¼‹¬åº¦ä½¿å…¶ææ–™åŽ»é™¤çŽ‡æžä½Žï¼ˆç”šè‡³åªæœ‰¼‹¬è´¨åˆé‡‘去除率的万分之一åQ‰ã€‚目前,PCD刀具刃¼‚¨å·¥è‰ÞZ¸»è¦é‡‡ç”¨æ ‘脂结合剂金刚石砂轮进行磨削。由于砂轮磨料与PCD之间的磨削是两种¼‹¬åº¦ç›¸è¿‘的材料间的相互作用,因此其磨削规律比较复杂。对于高¾_’度、低转速砂轮,采用水溶性冷却液可提高PCD的磨削效率和¼‚¨å‰Š¾_‘Öº¦ã€‚砂轮结合剂的选择应视¼‚¨åºŠ¾cÕdž‹å’ŒåŠ å·¥æ¡ä»¶è€Œå®šã€‚由于电火花¼‚¨å‰ŠåQˆEDGåQ‰æŠ€æœ¯å‡ ä¹Žä¸å—被¼‚¨å‰Šå·¥äšg¼‹¬åº¦çš„媄响,因此采用EDG技术磨削PCDå…ähœ‰è¾ƒå¤§ä¼˜åŠ¿ã€‚某些复杂åŞ状PCD刀å…øP¼ˆå¦‚木工刀å…øP¼‰çš„磨削也对这¿Uçµ‹zȝš„¼‚¨å‰Šå·¥è‰ºå…ähœ‰å·¨å¤§éœ€æ±‚。随着ç”늁«èŠÞq£¨å‰ŠæŠ€æœ¯çš„不断发展åQŒEDG技术将成äؓPCD¼‚¨å‰Šçš„一个主要发展方向ã€?/p> <p align="left">  3åQŽPCD刀å…ïLš„设计原则</p> <p align="center"><img border="0" alt="" src="http://www.hnrztcm.com/upfile/201408/201408180821440156_1.jpg" /></p> <p align="left">PCD刀ç‰?/p> <p align="left">  3.1 刀å…ähæ–™çš„选择</p> <p align="left">  åQ?åQ‰åˆç†é€‰æ‹©PCD¾_’度</p> <p align="left">  PCD¾_’度的选择与刀具加工条件有养I¼Œå¦‚设计用于精加工或超¾_‘ÖŠ å·¥çš„刀å…äh—¶åQŒåº”选用强度高、韧性好、抗冲击性能好、细晶粒的PCD。粗晶粒PCD刀具则可用于一般的¾_—加工。PCD材料的粒度对于刀å…ïLš„¼‚¨æŸå’Œç ´æŸæ€§èƒ½å½±å“æ˜„¡€ã€‚ç ”½I¶è¡¨æ˜Žï¼šPCD¾_’度可‚¶Šå¤§ï¼Œåˆ€å…ïLš„抗磨损性能­‘Šå¼ºã€‚采用De Beers 公司SYNDITE 002和SYNDITE 025两种PCD材料的刀具加工SiC基复合材料时的刀å…ïL£¨æŸè¯•éªŒç»“果表明,¾_’度ä¸?μm的SYNDITE  002PCD材料较易¼‚¨æŸã€?/p> <p align="left">  åQ?åQ‰åˆç†é€‰æ‹©PCD刀片厚åº?/p> <p align="left">  通常情况下,PCD复合片的层厚¾U¦äؓ0.3ï½?.0mmåQŒåŠ ä¸Šç¡¬è´¨åˆé‡‘层后的æ€ÕdŽšåº¦çº¦ä¸?ï½?mm。较薄的PCD层厚有利于刀片的ç”늁«èŠ±åŠ å·¥ã€‚De  Beers公司推出çš?.3mm厚PCD复合片可降低¼‚¨å‰ŠåŠ›ï¼Œæé«˜ç”늁«èŠÞqš„切割速度。PCD复合片与刀体材料焊接时åQŒç¡¬è´¨åˆé‡‘层的厚度不能太ž®ï¼Œä»¥é¿å…å› ä¸¤ç§ææ–™¾l“合面间的应力差而引起分层ã€?/p> <p align="left">  3.2 刀具几何参æ•îC¸Ž¾l“构设计</p> <p align="left">  PCD刀å…ïLš„几何参数取决于工件状å†üc€åˆ€å…ähæ–™ä¸Ž¾l“æž„½{‰å…·ä½“加工条件。由于PCD刀具常用于工äšg的精加工åQŒåˆ‡å‰ŠåŽšåº¦è¾ƒž®ï¼ˆæœ‰æ—¶ç”šè‡³½{‰äºŽåˆ€å…ïLš„刃口半径åQ‰ï¼Œå±žäºŽå¾®é‡åˆ‡å‰ŠåQŒå› æ­¤å…¶åŽè§’及后刀面对加工质量有明昑֪„响,较小的后角、较高的后刀面质量对于提高PCD刀å…ïLš„加工质量可è“v到重要作用ã€?/p> <p align="left">  PCD复合片与刀杆的˜qžæŽ¥æ–¹å¼åŒ…括机械夹固、焊接、可转位½{‰å¤š¿Uæ–¹å¼ï¼Œå…¶ç‰¹ç‚¹ä¸Žåº”用范围见表2ã€?/p> <p align="left">  PCD复合片与刀杆连接方式的特点与应ç”?/p> <p align="left">  ˜qžæŽ¥æ–¹å¼åQ?特点  åQ?应用范围</p> <p align="left">  机械夹固åQç”±æ ‡å‡†åˆ€ä½“及可做成各¿Ué›†åˆè§’度的可换刀片组成,å…ähœ‰å¿«æ¢å’Œä¾¿äºŽé‡¼‚¨çš„优点åQä¸­ž®åž‹æœºåºŠ</p> <p align="left">  整体焊接åQç»“构紧凑、制作方便,可制成小ž®ºå¯¸åˆ€å…øP¼ä¸“用刀å…ähˆ–难于机夹的刀å…øP¼Œç”¨äºŽž®åž‹æœºåºŠ</p> <p align="left">  机夹焊接åQåˆ€ç‰‡ç„ŠæŽ¥äºŽåˆ€å¤´ä¸ŠåQŒå¯ä½¿ç”¨æ ‡å‡†åˆ€æ†ï¼Œä¾¿äºŽåˆƒç£¨åŠè°ƒæ•´åˆ€å¤´ä½¾|®ï¼è‡ªåŠ¨æœºåºŠã€æ•°æŽ§æœºåº?/p> <p align="left">  可è{位-¾l“构紧凑åQŒå¤¹ç´§å¯é ï¼Œä¸éœ€é‡ç£¨å’Œç„ŠæŽ¥ï¼Œå¯èŠ‚省辅助时é—ß_¼Œæé«˜åˆ€å…·å¯¿å‘½ï¼æ™®é€šé€šç”¨æœºåºŠ</p> <p align="left">  4åQŽPCD刀å…ïLš„切削参数与失效机ç?/p> <p align="left"> </p> <p align="center"><img border="0" alt="" src="http://www.hnrztcm.com/upfile/201408/201408180821033750_1.jpg" /></p> <p align="left">4.1 PCD刀具切削参数对切削性能的媄å“?/p> <p align="left">  åQ?åQ‰åˆ‡å‰Šé€Ÿåº¦</p> <p align="left">  PCD刀具可在极高的主èáu转速下˜q›è¡Œåˆ‡å‰ŠåŠ å·¥åQŒä½†åˆ‡å‰Šé€Ÿåº¦çš„变化对加工质量的媄响不容忽视。虽焉™«˜é€Ÿåˆ‡å‰Šå¯æé«˜åŠ å·¥æ•ˆçŽ‡åQŒä½†åœ¨é«˜é€Ÿåˆ‡å‰ŠçŠ¶æ€ä¸‹åQŒåˆ‡å‰Šæ¸©åº¦å’Œåˆ‡å‰ŠåŠ›çš„增加可ä‹É刀ž®–发生破损,òq¶ä‹É机床产生振动。加工不同工件材料时åQŒPCD刀å…ïLš„合理切削速度也有所不同åQŒå¦‚铣削Al2O3强化地板的合理切削速度ä¸?10ï½?20m/minåQ›èžR削SiC颗粒增强铝基复合材料及氧化硅基工½E‹é™¶ç“ïLš„合理切削速度ä¸?0ï½?0m/minã€?/p> <p align="left">  åQ?åQ‰è¿›¾l™é‡</p> <p align="left">  如PCD刀å…ïLš„˜q›ç»™é‡è¿‡å¤§ï¼Œž®†ä‹Éå·¥äšg上残余几何面¿U¯å¢žåŠ ï¼Œå¯ÆD‡´è¡¨é¢¾_—糙度增大;如进¾l™é‡˜q‡å°åQŒåˆ™ä¼šä‹É切削温度上升åQŒåˆ‡å‰Šå¯¿å‘½é™ä½Žã€?/p> <p align="left">  åQ?åQ‰åˆ‡å‰Šæ·±åº?/p> <p align="left">  增加PCD刀å…ïLš„切削深度会ä‹É切削力增大、切削热升高åQŒä»Žè€ŒåŠ å‰§åˆ€å…ïL£¨æŸï¼Œå½±å“åˆ€å…·å¯¿å‘½ã€‚此外,切削深度的增加容易引起PCD刀具崩刃ã€?/p> <p align="left">  不同¾_’度½{‰çñ”çš„PCD刀具在不同的加工条件下加工不同工äšg材料æ—Óž¼Œè¡¨çŽ°å‡ºçš„切削性能也不ž®½ç›¸åŒï¼Œå› æ­¤åº”根据具体加工条件确定PCD刀å…ïLš„实际切削参数ã€?/p> <p align="left">  4.2 PCD刀å…ïLš„失效机理</p> <p align="left">  刀å…ïLš„¼‚¨æŸå½¢å¼ä¸»è¦æœ‰ç£¨æ–™ç£¨æŸã€ç²˜¾l“磨损(å†ïL„Š¼‚¨æŸåQ‰ã€æ‰©æ•£ç£¨æŸã€æ°§åŒ–磨损、热ç”늣¨æŸç­‰ã€‚PCD刀å…ïLš„失效形式与传¾lŸåˆ€å…ähœ‰æ‰€ä¸åŒåQŒä¸»è¦è¡¨çŽîCؓ聚晶层破损、粘¾l“磨损和扩散¼‚¨æŸã€‚ç ”½I¶è¡¨æ˜Žï¼Œé‡‡ç”¨PCD刀具加工金属基复合材料æ—Óž¼Œå…¶å¤±æ•ˆåŞ式主要äؓ¾_˜ç»“¼‚¨æŸå’Œç”±é‡‘刚çŸÏx™¶¾_’缺陷引èµïLš„微观晉™—´è£‚纹。在加工高硬度、高脆性材料时åQŒPCD刀å…ïLš„¾_˜ç»“¼‚¨æŸòq¶ä¸æ˜Žæ˜¾åQ›ç›¸åï¼Œåœ¨åŠ å·¥ä½Žè„†æ€§ææ–™ï¼ˆå¦‚碳¾U¤ç»´å¢žå¼ºææ–™åQ‰æ—¶åQŒåˆ€å…ïLš„¼‚¨æŸå¢žå¤§åQŒæ­¤æ—¶ç²˜æŽ¥ç£¨æŸè“vä¸Õd¯¼ä½œç”¨ã€?/p> <p align="left">  5åQŽç»“è¯?/p> <p align="left">  PCD刀具因其良好的加工质量和加工经‹¹Žæ€§åœ¨éžé‡‘属材料、有色金属及其合金材料、金属基复合材料½{‰åˆ‡å‰ŠåŠ å·¥é¢†åŸŸæ˜¾½Cºå‡ºå…¶å®ƒåˆ€å…·éš¾ä»¥æ¯”拟的优势。随着PCD刀å…ïLš„理论研究日益深入及其应用技术的˜q›ä¸€æ­¥æŽ¨òq¿ï¼ŒPCD刀具在­‘…硬刀具领域的åœîC½ž®†æ—¥ç›Šé‡è¦ï¼Œå…¶åº”用范围也ž®†è¿›ä¸€æ­¥æ‹“展ã€?/p> <p align="left"><br /> </p> </div> <div id="option"><a href="http://www.hnrztcm.com/news/" class="cB6B6B6 icon1">˜q”回列表</a>  <a href="javascript:window.close();" class="cB6B6B6 icon2">关闭本页</a>  <a href="javascript:window.print();" 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