IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第134页

T arget Condition - Class 1,2,3 (⽬标条件 - 1,2,3级) • No evidence of burrs. • 没有 毛刺 迹 象。 Acceptable - Class 1,2,3 (可接受条件 - 1,2,3级) • Burrs are acceptable for all classes provided they do not reduce hole diameter or plat- ing…

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This section identifies the acceptability characteristics for drilled PTHs. Although only two characteristics are identified (burrs and nailhead-
ing), good drilling is essential for a good PTH. The drilled hole wall should be smooth and free of burrs, delamination, burning, crushed insu-
lation, and protruding fibers. The hole should be perpendicular, round and not tapered. A poorly drilled hole may cause other problems that
have been described and characterized in other sections of this document. These problems are:
Rough plating
Nodules
Plating voids
Thin plating
Plating cracks (hole wall, corner)
Wicking (excessive)
Hole size reduction
Pink ring
Blow holes in soldering
Skip plating
The physical appearance of a particular hole will be affected by one or more of the following variables:
Drill point angle
Drill rotation speed
Drill feed rate
Drill sharpness
Nailheading is a condition which may develop during the drilling operation. Worn drills, improper speeds and feeds, and/or soft back up and
entry materials usually cause nailheading. The condition is acceptable for all classes.
本节旨在说明孔镀的可接受特性。虽然仅规定了两种特性(毛刺钉头,但的关
应该平滑没有毛刺、分绝缘出的纤维等。应该圆而非可能引起的其它许多
题,这些已经在本文件的其它章节中进行了描述与说明。这些问题是:
镀层粗糙
镀层空洞
镀层
镀层裂拐角
(过
径减
粉红
接时出现气孔
个别孔理外观受以下一多项变量的影响:
尖角度;
头转
进给
头锐
钉头过程中可能产生的一种状况。钉头通常是由于磨损、不适当的及进给,和(或)板、盖板材料等
的。这种情况对所有级产品是可接受的。
3.4
PLATED-THROUGH HOLES DRILLED(镀覆孔 孔)
Introduction(引⾔)
125IPC-A-600H-2010 20104
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
No evidence of burrs.
没有毛刺象。
Acceptable - Class 1,2,3(可接受条件 - 1,2,3级)
Burrs are acceptable for all classes provided they do not reduce hole diameter or plat-
ing thickness below required minimums.
要没有使镀层小至低于要求的最值,则毛刺对于所有级
是可接受的。
Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
341a
341b
341c
3.4 PLATED-THROUGH HOLES – DRILLED(镀覆孔 孔)
3.4.1 Burrs(⽑刺)
126 IPC-A-600H-201020104
Visual observations made on cross-sections only.对显微切片进行目检观察。
No evidence exists that nail heading affects functionality. The presence of nail heading may be considered an indicator of process or design
variation but is not a cause for rejection. Consider evaluation for glass bundle damage.
没有证表明钉头影响能。钉头的出现可视为制程示或设计变异,但不能作为拒收的理由。玻璃纤维损伤
342a
342b
3.4 PLATED-THROUGH HOLES – DRILLED(镀覆孔 孔)
3.4.2 Nailheading钉头
127IPC-A-600H-2010 20104
Visual observations made on cross-sections only.对显微切片进行目检观察。