TGASIA Archives

June 2012

TGAsia@IPC.ORG

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From:
LiHong MENG <[log in to unmask]>
Reply To:
LiHong MENG <[log in to unmask]>
Date:
Tue, 12 Jun 2012 03:39:38 +0000
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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:

[cid:[log in to unmask]]

Best regards

IPC中文培训官网:http://www.ipc.org.cn/Training-Certification/index.html

孟丽红

BDA Coordinator 业务拓展协调

IPC China

TEL:0755-86141218/19  分机:8012

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



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





***************************************************************************

制造处(MFG)/工业工程部(IE) /何健

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

(Shangzheng Yuanhong Road.Fuqing City,Fujian Province,P.R.China )

邮编(Postcode):350301

电话(Tel):+86-0591-85285555-7084

传真(Fax):+86-0591-85285447

手机(Mobile):13506979622

电邮(E-mail):[log in to unmask]<mailto:[log in to unmask]>

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

网址:http://www.tpvaoc.com<http://www.tpvaoc.com/>

***************************************************************************



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

**************************************

Telephone : +86-0769-87290991转8829

No.6 Lindong 3Road Lin Cun Industral Center

TangXia Dongguan Guangdong,P.R.C

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

Website : www.note.se<http://www.note.se>



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.

***************************************************************************

制造处(MFG)/工业工程部(IE) /钟文(Kevin)

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

(Shangzheng Yuanhong Road.Fuqing City,Fujian Province,P.R.China )

邮编(Postcode):350301

电话(Tel):+86-0591-85285555-7166

传真(Fax):+86-0591-85285447

手机(Mobile):15980730668

电邮(E-mail):[log in to unmask]

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

网址:http://www.tpvaoc.com<http://www.tpvaoc.com/>

***************************************************************************



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



*****************************************************

太仓阿尔派电子有限公司

生产技术课:周博浩

地址:江苏太仓经济开发区广州西路1号

TEL:0512-53568111-6421

FAX:0512-53568112

E-Mail:[log in to unmask]<mailto:[log in to unmask]>







 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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