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七步走:判定手插件是否满足通孔回流要求

七步走:判定手插件是否满足通孔回流要求

提升效率,降低加工成本,是我们SMT人不变的追求。

其中,将手插元件从波峰焊工艺改为通孔回流焊工艺,是各工厂大力推行的方案。

要实现通孔回流焊接,需要满足以哪些条件呢?

一.最关键是元件耐温的特性

1.1. 手插件通常采用波峰焊、选择性波峰焊或手工焊完成焊接。

1.2.而提到回流焊,则是在贴片后利用回流焊设备来焊接。

1.3.如果还有不明之处,可以参考#大揭秘波峰焊与回流焊详细说明回流焊和波峰焊工艺流程及特点。

1.4.手插件由壳体和引脚两个主要部分组成

1.5.其中介绍了两种工艺,及焊接要求,其中最重要的是回流焊是整个元件(壳体和引脚)能满足230260℃,焊接时间40秒左右要求;而波峰焊,选焊和手焊则只要引脚能满足焊接温度255265℃,焊接时间只有23秒的要求,这个温度和时间,热量还不足以完全传递到壳体(无铅焊接壳体实测温度会在150度左右)上面,就完成了焊接。

1.6.要取得耐温要求,没有比元件供应商更了解它的了,可以找供应商要TDS文件;也可以取得实物样品,实际过下回流焊,通过自己实际取得是否能过回流焊的数据信息。

以上是满足通孔回流的主要条件。

下面分享其它影响因素:

.连接器PIN针根部,四角垫高0.3毫米

2.1.最好设计:可以从钢网厚度,周边扩孔来保证锡量。

2.2.次之设计:周边有影响锡量的挡条,易少锡,可用阶梯钢网来弥补

2.3.最差设计:没有垫高,插件后,易挤出锡球(满足耐温要求,但是PIN脚底部是平的,无局部抬高处理,会挤压出锡造成锡球)

.PCB要求

3.1.PIN通孔要求-孔径:比针大0.2~0.3mm,机器贴装;手插则无妨碍,能顺利插入即可。

3.2.PIN通孔壁厚要求-孔壁铜厚:≥25μm;太薄不好上锡,易空洞

3.3.焊盘:大圈焊盘,不要小焊盘(焊盘外径:孔径+ 0.6mm

.钢网;

最好选择0.15毫米以上,0.2毫米最佳,保证锡量(经验分享)。

开口在不连锡,没有焊接不良时,尽量外扩,满足锡量要求。

五.元件情况

5.1.元件必须有吸取位置

如下面情况则不能实现机贴,有的贴片机可以改善成夹抓,可以抓取元件进行识别贴装。

而这种有耐高温的可吸取PAD,可以满足通用设备,吸取贴装

5.2.通常使用多为卷带料及TRAY方式供料,按照自有设备特点,选择合适的供料方式。

常用卷带供料

TRAY供料

六.贴片机吸取条件

连接器本身较高,对应的贴片机必须能满足吸取高度。

如连接器本身高度16.85毫米,贴片机自身吸取高度必须>16.85毫米 贴装头,才能完成吸取动作。

NPM则只能用贴片头V2,而8吸嘴贴片头则不可以。

七.检验标准

需要满足通孔回流要求,焊盘润湿和孔部填充要求。

7.1.焊盘表面100% 覆盖焊锡,无缩锡、露铜、拉尖、虚焊。

7.2.通孔填充率 ≥ 75%(行业标准)。

7.3.引脚根部无空洞、无缩孔,锡面光亮、爬锡均匀。

#PCB   #PCBA   #手插件  #回流焊  #波峰焊   #通孔回流

以上是我总结的主要判定及需要考虑的因素,你有什么看法呢,请留言说明。

大揭秘波峰焊与回流焊

PCB拼板设计避坑指南:工艺边、定位孔和雕码框

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  1. CONNECT:[ UseTime:0.000646s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000873s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000289s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000303s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000518s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000681s ]
  8. SELECT * FROM `article` WHERE `id` = 673401 LIMIT 1 [ RunTime:0.000460s ]
  9. UPDATE `article` SET `lasttime` = 1780051621 WHERE `id` = 673401 [ RunTime:0.003307s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000315s ]
  11. SELECT * FROM `article` WHERE `id` < 673401 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003170s ]
  12. SELECT * FROM `article` WHERE `id` > 673401 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000586s ]
  13. SELECT * FROM `article` WHERE `id` < 673401 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003488s ]
  14. SELECT * FROM `article` WHERE `id` < 673401 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001317s ]
  15. SELECT * FROM `article` WHERE `id` < 673401 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004269s ]
0.119334s