目前IPC已起草:IPC-7251<http://www.ipc.org/committeedetail.aspx?Committee=1-13> Generic Requirements for Through-Hole Design and Land Pattern Standard


另外,AJ-820A中有部分描述:
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Best regards
IPC中文培训官网:http://www.ipc.org.cn/Training-Certification/index.html
孟丽红
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发件人: TGAsia [mailto:[log in to unmask]] 代表 Jian He 何健
发送时间: 2012年6月12日 11:12
收件人: TGAsia
主题: [TGAsia] 答复: [TGAsia] 答复: [TGAsia] 答复: [TGAsia] 回复:[TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准

一般要求是这样的:
手插DIP元件焊盘孔径:d(元件脚直径)+0.2mm
AI元件焊盘孔径:d+0.3或0.4mm,一般根据机台的精度来试验制定的

貌似IPC也有这方面的标准吧,之前听说过 IPC-7352,但是至今还没见过这个标准呢,可以去了解下


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发件人: TGAsia [mailto:[log in to unmask]]<mailto:[mailto:[log in to unmask]]> 代表 Shirley He
发送时间: 2012年6月12日 9:58
收件人: [log in to unmask]<mailto:[log in to unmask]>
主题: Re: [TGAsia] 答复: [TGAsia] 答复: [TGAsia] 回复:[TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准


各位高手,

    请教一下,圆柱体的元器件和PCB PAD的设计有要求吗?如果有,应该参考那份标准?
还有,通孔元气件引脚的直径和PCB 通孔开口的比例应该怎样计算才能满足上锡要求,有没有标准可以参考?

谢谢了!

Shirley He
2012/06/12
Jessy Lai <[log in to unmask]<mailto:[log in to unmask]>>
Sent by: TGAsia <[log in to unmask]<mailto:[log in to unmask]>>

2012-06-07 13:42
Please respond to
Jessy Lai <[log in to unmask]<mailto:[log in to unmask]>>


To

<[log in to unmask]<mailto:[log in to unmask]>>

cc

Subject

[TGAsia] 答复: [TGAsia] 答复: [TGAsia] 回复:[TGAsia]  答复:  Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准







元件引脚直径与PCB焊盘孔径应遵循以下关系:
元件脚直径                                   PCB焊盘孔径
D<=等于1.0mm                             D+0.3/0.15mm
1.0mm < D <=等于1.0mm                D+0.4/0.2mm
D>2.0                                             D+0.5/0.2mm







Thanks & Best Regards,
 PE  Jessy.Lai
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发件人: TGAsia [mailto:[log in to unmask]]<mailto:[mailto:[log in to unmask]]> 代表 Wen Zhong 钟文
发送时间: 2012年6月7日 12:58
收件人: [log in to unmask]<mailto:[log in to unmask]>
主题: [TGAsia] 答复: [TGAsia] 回复:[TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准


Dear all:

我觉得有道理,我们公司现在的CEM-1 板材的孔洞也非常严重。孔与引脚直径的匹配我认为是一个非常重要的因子。
现在我们是0.4,但是有实验表明,0.3以下是比较优的匹配

BR
My office phone number have been changed to 7166.
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福建捷联电子有限公司/ Top Electronics(Fujian)Co.,Ltd
地址(Add):中国.福建省福清市元洪路上郑
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发件人: TGAsia [mailto:[log in to unmask]]<mailto:[mailto:[log in to unmask]]> 代表 Tang Xianjun
发送时间: 2012年6月7日 10:59
收件人: [log in to unmask]<mailto:[log in to unmask]>
主题: [TGAsia] 回覆: [TGAsia] 回复:[TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准

还有一个重要的因素,元件脚大小和孔径的匹配性。如果超过0.2mm,引起焊接锡洞的风险也大大升高。個人非常不贊同你的觀點,因為你的這個結論是錯誤的。



Best Regards
寄件者: TGAsia [mailto:[log in to unmask]]<mailto:[mailto:[log in to unmask]]> 代理 维乐他爸
寄件日期: 2012年6月7日 10:23
收件者: [log in to unmask]<mailto:[log in to unmask]>
主旨: [TGAsia] 回复:[TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准


还有一个重要的因素,元件脚大小和孔径的匹配性。如果超过0.2mm,引起焊接锡洞的风险也大大升高。

------------------ 原始邮件 ------------------
发件人: "Bohao Zhou"<[log in to unmask]<mailto:[log in to unmask]>>;
发送时间: 2012年6月7日(星期四) 上午9:48
收件人: "TGAsia"<[log in to unmask]<mailto:[log in to unmask]>>;
主题: [TGAsia] 答复: Re: [TGAsia] 答复: [TGAs ia] 请教,焊锡引脚上有空洞的原因及判定基准

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 发件人:     BOHAO ZHOU/AOTA/SPEED

 收件人:     <[log in to unmask]<mailto:[log in to unmask]>>

 抄送:       [log in to unmask]<mailto:[log in to unmask]>

 日期:       2012-06-07 09:44

 主题:       答复:  Re: [TGAsia] 答复: [TGAsia] 请教,焊锡引脚上有空洞的原因及判定基准





关于这个问题我们做了很多实验,减少和增大松香的量,增加预热的时间,提高焊接温度
和时间,但是效果都不是很明显,
也尝试过基板预烘干(这个有点效果,但不能彻底解决问题),想请问一下基板预烘干的
温度和时间一般设定为多少度烘干多长时间呢?
基板断面分析\X-RAY 也作过,但是还是没有找到真正的原因.
想请问还可以从哪些方面分析找原因呢?




 发件人:     <[log in to unmask]<mailto:[log in to unmask]>>

 收件人:     <[log in to unmask]<mailto:[log in to unmask]>>

 日期:       2012-06-07 09:05

 主题:       Re: [TGAsia] 答复: [TGAsia] 请教,焊锡引脚上有空洞的原因及判定基准

 发件人:    TGAsia <[log in to unmask]<mailto:[log in to unmask]>>







这种情况还有一种可能,波峰焊在焊接前需要喷涂flux,flux受热时会发生分解产生
气体,要是喷涂的量过大或是flux的活性过强,产生的气体来不及排除,就有可能在
焊点中产生针孔

Thanks and Best Regards

Sonic Lu 陆尚

宠辱不惊,闲看庭前花开花落
去留无意,漫随天外云卷云舒
Autoliv Electronics China (ACE) Co.,Ltd
Tel:  +86-21-67109300-3162


"Yun, Xunisa (惲黎銀 IES)"
<[log in to unmask]<mailto:[log in to unmask]>>
Sent by: TGAsia <[log in to unmask]<mailto:[log in to unmask]>>                                       To
                                             <[log in to unmask]<mailto:[log in to unmask]>>
                                                                       cc
2012-06-06 20:07
                                                                  Subject
                                             [TGAsia] 答复: [TGAsia] 请
          Please respond to                  教,焊锡引脚上有空洞的原因及
     "Yun, Xunisa (惲黎銀 IES)"              判定基准
    <[log in to unmask]<mailto:[log in to unmask]>>











我们称之为吹孔,通常是由于PCB 孔壁镀铜异常造成基材膨胀产生的气体外泄所
致,以我们的经验责任判定都是属PCB供应商的,可追偿。
通常需要切片进一步分析才能得到真正原因。



Best Regards
Xunisa, Yun
EXT: 63184,MVPN:663184
MPT/IPT – Inventec Group
发件人: TGAsia [mailto:[log in to unmask]]<mailto:[mailto:[log in to unmask]]> 代表 Bohao Zhou
发送时间: 2012年6月6日 10:10
收件人: [log in to unmask]<mailto:[log in to unmask]>
主题: [TGAsia] 请教,焊锡引脚上有空洞的原因及判定基准


请教各位专家一个问题:
基板在过完波峰焊以后,焊锡引脚上会发生空洞.
附照片:
(Embedded image moved to file: pic17035.gif)
请问产生空洞的原因会有哪些呢?另外IPC中有没有关于这方面的判定基准呢?

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