IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第133页
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 sho…
Nonconforming - Class 1,2,3（不符合条件 - 1，2，3级）
• Defects either do not meet or exceed above criteria.
• 缺陷不符合或超出上述要求。
图3317c
3.3 PLATED-THROUGH HOLES – GENERAL（镀覆孔 – 总则）
3.3.17 Cap Plating of Filled Holes (cont.)（填塞孔的盖覆电镀（续））
Visual observations made on cross-sections only.（仅对显微切片进行目检观察。）
124 IPC-A-600H-20102010年4月
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.
本节旨在说明钻孔镀覆孔的可接受特性。虽然仅规定了两种特性（毛刺和钉头），但良好的钻孔是优质镀覆孔的关键。钻孔的孔
壁应该平滑且没有毛刺、分层、烧焦、破碎绝缘物及突出的纤维等。孔应该垂直、圆而非锥形。差的钻孔可能引起的其它许多问
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
• 结瘤
• 镀层空洞
• 镀层过薄
• 镀层裂缝（孔壁、拐角）
• 芯吸（过度）
• 孔径减小
• 粉红环
• 焊接时出现气孔
• 跳镀
个别孔的物理外观会受以下一项或多项变量的影响:
• 钻尖角度；
• 钻头转速；
• 钻头进给速率；
• 钻头锐利度。
钉头是钻孔过程中可能产生的一种状况。钉头通常是由于钻头磨损、不适当的转速及进给速率，和（或）软的垫板、盖板材料等
造成的。这种情况对所有级别产品均是可接受的。
3.4
PLATED-THROUGH HOLES – DRILLED（镀覆孔 – 钻孔）
Introduction（引⾔）
125IPC-A-600H-2010 2010年4月
Target 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 thickness below required minimums.
• 只要没有使孔径或镀层厚度减小至低于要求的最小值，则毛刺对于所有级别产
品均是可接受的。
Nonconforming - Class 1,2,3（不符合条件 - 1,2,3级）
• Defects either do not meet or exceed above criteria.
• 缺陷不符合或超出上述要求。
图341a
图341b
图341c
3.4 PLATED-THROUGH HOLES – DRILLED（镀覆孔 – 钻孔）
3.4.1 Burrs（⽑刺）
126 IPC-A-600H-20102010年4月
Visual observations made on cross-sections only.（仅对显微切片进行目检观察。）