IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第132页

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 PLA TED-THROUGH HOLES – GENERAL (镀覆孔 – 总 则) 3.3.17 Cap Plating of Filled Holes (cont.) (填塞…

100%1 / 180
When copper cap plating of filled holes is specified by the master drawing the following shall apply.
图规定用盖覆电镀时,应当采用以下要求。
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
Copper surface is planar with no protrusion (bump) and/or depression
(dimple)
表面无凸起(凸块)和陷(
Acceptable - Class 1,2,3(可接受条件 - 1,2,3级)
Separation of copper cap to fill material.
No separation of the cap plating to underlying plating.
Cap protrusion (bump) and/or depression (dimple) meets the dimen-
sional requirements in IPC-6012.
Fill material within the blind via shall be planar with the surface within
± 0.076 mm [0.003 in] unless otherwise specified.
When cap plating is specified, fill material within the blind via shall
meet the dimple/bump requirements of IPC-6012.
No voids in the cap plating over the resin fill.
允许铜盖覆材料的分
盖覆镀层层镀层没有分
盖覆的起(凸块)和陷(IPC-6012中的尺寸要求。
有规定,内的材料与表面的整度应当在
+/-0.076mm[0.003in]以内。
当规定盖覆电镀时,内的材料应当IPC-6012中的
陷和起要求。
树脂上的盖覆镀层空洞。
3317b
3317a
3.3 PLATED-THROUGH HOLES – GENERAL(镀覆孔 则)
3.3.17 Cap Plating of Filled Holes(填塞孔的盖覆电镀)
Visual observations made on cross-sections only.对显微切片进行目检观察。
123IPC-A-600H-2010 20104
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。
3317c
3.3 PLATED-THROUGH HOLES – GENERAL(镀覆孔 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.对显微切片进行目检观察。
124 IPC-A-600H-201020104
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