ÒøÓégegÓÅÔ½»á

http://edadoc.com/

ÖÐÎÄ

EN JP
ºá·ù¹ã¸æbanner-¸ßËÙÏÈÍâÐлú°æ
SMTÉú²úʱ  £¬ÄÇЩ²»Ìṩ×ê¿×Îļþµ¼Öµĺ¸½ÓʧЧ°¸Àý

SMTÉú²úʱ  £¬ÄÇЩ²»Ìṩ×ê¿×Îļþµ¼Öµĺ¸½ÓʧЧ°¸Àý

Ðû²¼Ê±¼ä£º2023-07-25 08:55

¸ßËÙÏÈÌìÉúÔ±--Íõ»Ô¶«


ÓñÈËÈôÓñ½£Èçºç  £¬ÈôÓñÎÂÈáÈçÓñ  £¬Ã²ÃÀÈçÓñ  £¬¾²Èç´¦×Ó  £¬¶¯ÈçÍÑÍá£ÆäÉùÈçºéÖÓ  £¬ß³ßå·çÔÆ  £¬¿´´ýPCBµÄÓªÒµ  £¬ÄÇÊǰËÔµÄÌ«Ñô  £¬°®µÃ»ðÈÈ¡£ËùνÐÂÎŽԷçÔÆ  £¬ÕýÊǶÔÈôÓñ×îÕæÊµµÄдÕÕ¡£ËýÊÇ´óÎ÷ÄϵØÇøµÄ½ðÅÆÖúÀí  £¬±»½£¸ç³ÆÎª·ÅÔÚÐļâ¼âÉϵķÏÎï¡£


ËýÔÚPCBµÄ·Éϱ»Ç±ÒÆÄ¬»¯  £¬ÈÕ½¥Ñ¬ÌÕ  £¬¶ÔPCBA×°Å亸½ÓËä²»¿É³ÆµÃÉÏר¼Ò  £¬µ«Ò²ÄܳƵÃÉÏרҵ¡£


×òÌìÍíÉÏ  £¬¸Õ¼ÓÈëÁ˺¸½Ó¹¤³§ÔøË¾Àí¹ØÓÚ¡¶SMT¿ª¸ÖÍø²»Ìṩ×ê¿×ÎļþµÄÒþ»¼ºÍDFM°¸Àý¡·µÄÅàѵ¡£


½ñÌìËý¾Í½Óµ½¿Í»§´úÂëΪ187µÄÒ»¸öº¸½Ó¶©µ¥  £¬·¢Ã÷¿Í»§º¸½ÓÎļþÀïûÓÐÌṩ×ê¿×Îļþ¡£ 

259-001.png

ÈôÓñ¸ÏæÄÃÆðµç»°¾ÍºÍ¿Í»§Ïàͬ  £¬ÈÃ187Ìṩ×ê¿×Îļþ¡£¿Í»§Ïë²»Ã÷È·  £¬PCBµÄº¸½Ó  £¬ÎªÊ²Ã´ÒªÌṩ×ê¿×Îļþ  £¬ËüºÍº¸½ÓÓÐʲô¹ØÏµ  £¬²»ÌṩËüÓÐʲôÒþ»¼ÄØ¡£


ÈôÓñ˵ÎÒ¸Õ½ÓÊÜÁËÔøË¾ÀíµÄרҵÅàѵ  £¬¹ØÓÚ×ê¿×¶Ôº¸½ÓµÄÓ°Ïì  £¬ÈÃÎÒÀ´¸æËßÄã¡£


Îý¸àÓ¡Ë¢  £¬ÔÚSMTº¸½ÓʱÊÇÒ»¸öÖ÷Òª»·½Ú  £¬ÊÇÒ»¸öÉæ¼°ÒòËØÖÚ¶àÇÒÏàµ±ÖØ´óµÄÀú³Ì¡£


ÓÐÊý¾ÝÅú×¢ÔÚSMTµÄÉú²ú»·½Ú  £¬ÓÐ60-70%µÄ²»Á¼ÊÇÓÉÎý¸àÓ¡Ë¢µ¼ÖµÄ¡£


ÕâЩ²»Á¼²¢²»ÊÇÎý¸àÓ¡Ë¢×°±¸µ¼Ö嵀  £¬¾ø´ó²¿·ÖÊÇÔÚ¹¤³ÌÆÀ¹ÀºÍ¸ÖÍø¿ª¿×ÓÅ»¯Ê±±¬·¢µÄ¡£ÌØÊâÊÇ×ê¿×ÎļþµÄÌṩ  £¬ÔÚ¹¤³ÌÖÆ×÷ʱ  £¬¿ÉÒÔ¹æ±ÜÐí¶àSMTº¸½Ó²»Á¼¡£


¾ÝE¹«Ë¾5´óº¸½Ó³§¹¤³Ì²¿ÌṩµÄÊý¾Ýͳ¼Æ  £¬ÔÚSMTº¸½ÓʱδÌṩ×ê¿×²ãÎļþµÄƽ¾ù±ÈÀýΪ15%×óÓÒ¡£ÈôÊÇÆ¾Ö¤Õâ¸ö±ÈÀý  £¬¿ªÖƸÖÍøÊ±  £¬¿Í»§²»Ìṩdrl£¨×ê¿×²ã£©  £¬Æ½¾ùÌìÌì¾ÍÓÐ1¸öµ¥¼°ÒÔÉÏ¡£¹¤³ÌÖ°Ô±ºÍPMCÒª·¢ÓʼþºÍ¿Í»§Íù·µÈ·ÈÏ¡£ÆðÔ´ÅÌËã  £¬´Ó·¢ÓʼþÌá³öÐèÇó¼°¿Í»§Ìṩ×îÖÕ×ÊÁÏ  £¬Ã¿µ¥ÒòÕâ¸öÎÊÌâµÄÏàͬ±¾Ç®´óÖÂÊÇ20·ÖÖÓ*5¸ö¹¤³§  £¬1ÌìÏàͬ±¾Ç®¾ÍÓÐ100·ÖÖÓ¼°ÒÔÉÏ  £¬1¸öÔ·ݵ¥ÒòÕâ·½ÃæµÄÏàͬ±¾Ç®¾Í´ï43Сʱ  £¬Ê±¼ä¾ÍÊDZ¾Ç®Ñ½¡£


¸ÖÍøÊÇSMTº¸½ÓµÄÖ÷Òª¹¤¾ß¡£


¿ª¸ÖÍøÊÇÒ»¸öϵͳ¹¤³Ì  £¬¶ø²»ÊǼòÆÓµÄ¿ª¸ö¿×¾Í¿ÉÒÔ¡£


¿ª¸ÖÍøÒªÔõôȥ¹æ±Ü¿×ÄÚ½øÎý  £¬µ¼ÖµÄÐ麸ÎÊÌâ¡£


Éè¼Æ¸ÖÍøÎªÊ²Ã´ÐèÒª×ê¿×²ãÎļþ  £¬Çë¿´ÏÂÃæµÄ°¸Àý¡£


1.º¸Å̱ßÑØÓÐ×ê¿×  £¬ÓÉÓÚ¿Í»§Ã»ÓÐÌṩ×ê¿×Îļþ  £¬¹¤³ÌÔÚ¿ªÖƸÖÍøÊ±²»¿Éʵʱ·¢Ã÷²¢¹æ±ÜÕâЩ¿×  £¬µ¼ÖÂ×èÈÝÁÏ»òÅþÁ¬Æ÷·ºÆðÐ麸¼Ùº¸¼°ÎýÉٵIJ»Á¼¡£

 

2.QFNµÄ½ÓµØº¸ÅÌ  £¬ÖÐÐÄûÓÐ±Ü¿×  £¬µ¼ÖÂÎýÈë¿×  £¬Ð麸¡£IC¼°QFN/QFP¹¦Ð§½Å±ßÑØÓÐ×ê¿×²ã  £¬¸ÖÍø¿ª¿××ö±ÜÈûòÔöÌíÎýÁ¿Ìî³ä  £¬ÈÃÎýÁ¿Ô½·¢±¥Âú  £¬ÈôÊǽӵØÊôÐÔ  £¬º¸ÅÌÐèÒªÔ¤Áô×ã¹»µÄ±Õ¿×Çå¾²¿Õ¼ä»òÍêÈ«Ìî³äÈû¿×´¦Öóͷ£  £¬×èÖ¹×èÈÝÁÏоƬ·ºÆðÐéαº¸¡£

 259-03.png

ûÓÐÌṩ×ê¿×²ãÎļþ  £¬ÔÚ¿ª¸ÖÍøÊ±²»¿Éʵʱ·¢Ã÷ºÍ¹æ±Ü´ËÀàÎý¸àÈë¿×µÄÎÊÌâ¡£


ËäÈ»ÎÒÃÇÇ°Ãæ½²ÁËÐí¶àÆÚ¹ØÓÚPCBÅÌÖп׵ÄÉè¼Æ  £¬Ç¿ÁÒÒªÇó×öPOFV¹¤ÒÕ  £¬µ«ÈÔÓÐÐí¶à¿Í»§ÎªÁË¿ØÖƱ¾Ç®  £¬²»×öÊ÷Ö¬Èû¿×µç¶ÆÌîÆ½¹¤ÒÕ  £¬µ¼ÖÂÐí¶àSMDº¸ÅÌÉÏ»òÆä±ßÑØÓÐ×ê¿×¡£


ÈÖÂíδ¶¯  £¬Á¸²ÝÏÈÐÐ  £¬Í¨³£PCBÂã°å»¹ÔÚÏß·°å³§Éú²ú  £¬ÉõÖÁ¶¼»¹Ã»ÓÐÏÂÏß  £¬¿Í»§ÎªÁ˸Ͻ»ÆÚ  £¬¾Í׿±ÒªÇóSMT¹¤³§¿ª¸ÖÍø¡£Î´¼ûʵÎï  £¬ÏȰ´¸ÖÍøÎļþ¿ª¿×¡£


¶ø¿ª¸ÖÍøÊ±  £¬¿Í»§ÓÖ²»Ìṩ×ê¿×Îļþ¸ø¹¤³§  £¬µ¼Ö¸ÖÍøÉè¼ÆÊ±  £¬ÎÞ·¨Ê¶±ðµ½ÅÌÖпס£ÓÉÓÚÅÌÖп×ûÓÐ±Ü¿×  £¬·ºÆðµÄº¸½ÓÒì³£  £¬Êý²»¿°Êý¡£


LGA/BGAоƬ  £¬ÌáǰÔÚ¿ªÖƸÖÍøÇ°ÆÀ¹ÀÊÇ·ñÓÐÅÌÖÐ¿×  £¬Ìáǰ¼ì²é·´Ïì  £¬Ìáǰ×èµ²ÎÊÌâ  £¬×èÖ¹²»¿ÉÔ¤¹ÀÆ·ÖÊÒþ»¼¡£

259-04.png  

Óйý¿×¾àSMDÌ«½ü  £¬ÓÉÓÚÎýÇòÁ÷¾­»ØÁ÷º¸(Reflow)ʱ²¿·ÖµÄÎý»áÓÉÓÚëϸÕ÷Ïó(wicking)Á÷½øµ¼Í¨¿×¶øÔì³ÉÎýÁ¿È±·¦  £¬µ¼ÖÂÆ÷¼þÐ麸¡£ 

   259-05.png

259-06.png

ÅÌÖп××öÂÌÓÍÈû¿×  £¬¹ýÍê»ØÁ÷º¸µÄº¸ÅÌ  £¬Ò»³ØÇïË®  £¬ÂÌÓÍÓÍ¡£  

259-07.png

 4.MOS¹ÜÆ÷¼þ½ÓµØº¸ÅÌûÓиø×ê¿×²ã  £¬Éè¼Æ¸ÖÍøÃ»ÓÐ±Õ¿×  £¬º¸½ÓBOTÃæÊ±ÎýÉøÍ¸µ½TOPÃæ¶¥Æð0.5mmÎýÇò  £¬Ó°ÏìTOPÃæÓ¡Ë¢  £¬Í¬Ê±MOS¹Ü½ÓµØº¸ÅÌÎýÁ¿È±·¦  £¬ÈÝÒ×Ôì³ÉÐéαº¸»òÉ¢ÈÈЧ¹ûÇ·ºÃ  £¬ÓÐÉÕ°åΣº¦¡£ 

259-08.png

PCBÉè¼ÆÊ±Ö»¹Ü¹æ±ÜÅÌÖÐ¿×  £¬ÈôÊÇÎÞ¹æÔò±Ü  £¬ÇëÎñ±Ø×öPOFV£¨Ê÷Ö¬Èû¿×µç¶ÆÌîÆ½£©¹¤ÒÕ¡£


PCB×ê¿×Éè¼ÆÊ±  £¬¿×±ß¾àSMDº¸Å̱ßÑØ¿ØÖÆÔÚ8mil¼°ÒÔÉÏ¡£


5. gerberÎļþÖÐÓÐ×ê¿×²ã  £¬ÍŽá×ê¿×²ãÕÒµ½¶ÔÓ¦·ûºÅ¾Í¿ÉÒÔ׼ȷʶ±ð¹¤¾ß¿×  £¬ÈçÏÂÂÝÖù¿ª¿×ʱ×ö¿Õ¼ä±ÜÈóߴç¾ÍºÜÊǵÄ׼ȷÇåÎú¡£

 259-09.png

Ò»¾ä»°×ܽá  £¬ºÏÀí±Ü¿×  £¬º¸½ÓÆ·ÖÊÌáÉý  £¬Ìṩ×ê¿×²ã±ãÓÚÉè¼Æ¸ÖÍøÊ±  £¬Ê¶±ðij¸öµØ·½ÊÇ·ñÓÐ×ê¿×»ò×ê¿×µÄ׼ȷ³ß´ç  £¬ÔÚÉè¼Æ¸ÖÍøÊ±ÓÐÓÃÆÀ¹À¿ª¿×  £¬±ÜÃâ²»ÐëÒªµÄ¿×λ¶à¿ª¡¢ÉÙ¿ª»ò¸Ã±ÜÈõĿռäûÓбÜÈõ½  £¬¸ÃÔöÌíÎýÁ¿¶Â¿×µÄλÖÃûÓмӱ¥Âú  £¬¹æ±ÜÉè¼Æ²»¶ÔÀíÒýÆðÆ·ÖÊÒþ»¼¡£


¿Í»§187ÌýÍêÈôÓñµÄ½²ÊöÒÔºó  £¬Ë²¼ä¸ÐÊܺó±³À亹ֱÁ÷  £¬ÂíÉÏ·¢¹ýÀ´×ê¿×Îļþ  £¬²¢ÇÒ¸æËßÈôÓñ  £¬Õâ´ÎллÌáÐÑ  £¬ºóÃæº¸½ÓʱÎÒÒ»¶¨ÒªÌṩ×ê¿×Îļþ  £¬Èô·¢Ã÷ÎÒûÓÐÌṩ  £¬ÇмÇÒªµÚһʱ¼äÕÒÎÒÒª  £¬ÕâÌ«ÏÅÈËÁË¡£

ÍøÕ¾µØÍ¼