抛砖引玉-关于表面质量

我是新人 · 发表于 2003-8-7 17:19:00

[这个贴子最后由我是新人在 2003/08/07 09:24am 第 1 次编辑]

4.1.1 OPTICS – those parts that function either by reflecting an optical beam, allowing the beam to pass through or stopping propagation of the beam.
They include, but are not limited to: exit windows, filters, lenses, lens holder, visible laser diode (VLD), and mirrors.

4.1.2 CLEAR APERTURE AREA – also known as the working surface of the optic which is 90% of the part’s optical surface area unless otherwise specified.

4.1.3 COATINGS – various films applied to the optic’s surface for achieving a particular purpose, such as increasing or decreasing reflectance or transmission and protecting the surface. Various coating technologies can produce an effect known as rainbow.

4.1.4 EQUIVALENT DIAMETER – the calculated diameter equal to half Length plus Width of an optical surface ((L + W) ÷2), used in disposition components or assemblies with noncircular defects.

4.1.5 UNAIDED EYE – vision which is 20–20 or corrected to 20–20 with no additional use of magnification allowable.

4.1.6 DISPLAY WINDOW – for the purposes of this standard, it refers to a molded part of a computing device that is attached to a housing and functions by allowing light to pass through (transparent). Also serves to cover and protect a display (LCD).

4.1.7 SCRATCH/DIG COMPARATOR SYSTEM – a measuring system for determining the acceptability of scratches and digs. The comparators are 10x eye loupes with scratch and dig reticles which allow comparisons of the actual scratch or dig on the part to the coded sizes on the reticles, such as Rolyn Optics Co. Model DS–300.

4.1.8 QUALITY (SQ) – defines scratch and dig criteria which is usually specified on a drawing as two numbers:
The first number represents the maximum allowable width of a scratch in microns (millionth of a meter or thousandths of a millimeter –– 0.001 mm or 0.00004 inch.)
The second number is the maximum allowable diameter of a dig (generally circular in shape) in 1/100 of a millimeter –– 0.01 mm or 0.0004 inch.
Example: SQ 80 – 50
80: the max. allowable width of a scratch is .080 mm (0.003 inch)
50: the max. allowable diameter of a dig is .500 mm (0.020 inch)
Note: SQ applies to the clear aperture area only, unless otherwise specified.

4.1.9 ASSEMBLY DIRT – dust, lint, paint, metal or other foreign particles that settle on the part’s surface in the assembly environment and can usually be removed by proper cleaning.

4.1.10 WATER SPOT——residue of evaporated or unevaporated moisture.

4.1.11 BUBBLES / PIN HOLES / VOIDS / INCLUSIONS / PAINT RESIDUE /
BLACK SPOT – air, gaseous, or solid inclusions entrapped within a part.

4.1.12 FINGERPRINTS / SMUDGES – oil, dirt and / or grease transferred from the handler’s protected / unprotected fingers to an optical surface.

4.1.13 SCRATCHES—— any linear mark or tearing of the surface done by a sharp or rough object.

4.1.14 DIGS – breaks, pits, holes and broken surface bubbles.

4.1.15 SCUFF MARKS – permanent damage to a part due to careless handling or packaging; resembles a smudge but cannot be removed.

4.1.16 RAINBOW – bands of full color rings visible when a part is viewed and rotated at various angles.

4.1.17 STAINS – any localized discoloration found on a part.

4.1.18 EDGE CHIPS – flaws at an edge from fragments which are broken off usually during manufacture or handling.

INSPECTION METHOD
The following VISUAL inspection method shall be utilized as the first step in determining acceptability. Visual inspection is performed with unaided eyes, unless otherwise noted. If an imperfection / flaw (potential defect) is visible, use the criteria listed in this standard to determine acceptability.

7.1 Light Source
Incoming Inspection / Lot Acceptance of optical elements for cosmetic defects shall be accomplished using a suitable viewing fixture. An approved viewing fixture is manufactured by Davidson Optronics, Inc. and is available as Model DS–300.
Production floor acceptability shall be accomplished using normal office lighting (e.g. cool, white fluorescent light) of 100 to 120 foot candles, positioned no closer than 16 inches (41 cm) to the part under observation of black background. Rainbow over the surface of a display window is inspected with either black or white background to increase visibility to human eyes..
For display window, reflected light is allowed for inspection rainbow.

7.2 Viewing Angle
In all cases, a part shall be held such that light is not reflected back directly to a viewer.
Starting at 90° (perpendicular) to both horizontal and vertical axes, the part can be rotated approximately 45° about each axis in each direction (up / down; left / right).

7.3 Viewing Distance
The distance from a viewer’s eyes to an optical part under observation shall be 12 ± 1 inch (30 ± 3 cm).

7.4 Viewing Time
The standard time for viewing parts to determine acceptability shall not exceed 5 seconds.

7.5 Surface Quality, SQ – To determine SQ, the following method shall apply.
Using Scratch / Dig Comparison Templates / Standards compare the size of the widest scratch (width) and the largest dig (diameter) to specification.

7.5.1 If either the widest scratch or the largest dig exceeds the specification:
REJECT the part. If unsure after using the templates, measure the widest scratch (width) and the largest dig (diameter) with a Scratch / Dig Comparator System to verify the size. If either exceeds the specification: REJECT the part.

7.5.2 For parts with multiple scratches and / or digs (regardless of whether the measured value falls within specification), the accumulated length of the scratches (Table 1) and the allowable quantity and spacing of digs (Table 2) needs to be determined prior to dispose an optical part. Both are functions of the size (equivalent diameter) of the part.
NOTES:
a. Scratches must meet both width and length requirements. Scratch width should always be checked first since it is the more critical dimension and is easier to measure than length.
b. Digs must meet diameter, quantity and spacing requirements. Maximum allowable quantity and minimum spacing distance must fall within any 0.80inch (20 mm) diameter circle (Table 2).

Table 1  ACCUMULATED LENGTH OF SCRATCHES
(BASED ON SCRATCH NUMBER)
Spec.

Measured 20 40 60 80 100 120
20    1 2  3  4  5  5
40    R 1/2 1  1  2  2
60    R R  1/2 1/2 1  1
80    R R  R  1/4 1/4 1/4
100 R R  R  R  1/5 1/5
120 R R  R  R  R  1/8

Notes:
1). R = Reject in all cases
2). The values (1/8, 1/4, 1, 2, etc.) in the table represent multiples or fractions of the diameter (or equivalent diameter) of a part in question which is used to calculate the maximum allowable accumulated length of scratches.

EXAMPLE:
A part has 3 scratches. Its physical dimensions are: Length (L) = 3 inches; Width (W) = 1 inch. Calculated equivalent diameter = 1/2 × (L+ W) = 2 inches.
Specification is 80 (scratch number): actual measured value of the 3 scratches is 60 each.
Reading down the Specification column of 80, across to the Measured row of 60 indicates a multiple of 1/2 the diameter for the maximum accumulated length.
Measure the length of each scratch and add together to determine the total accumulated length.
Accept the part if the ACCUMULATED LENGTH of the 3 scratches is ≤ 1 inch; Otherwise Reject the part.

Table 2  ACCEPTABLE QUANTITY AND SPACING OF DIGS PER EVERY 0.8 inch DIAMETER CIRCLE (BASED ON DIG NUMBER)

Spec.

Measured 20 40 50 60 80 MinimumSpacing
20 1  4  5  5  5  2 mm\0.08 inch
40 R  1  2  2  2  6 mm\0.23 inch
50 R  R  1  1  1  10 mm\0.39 inch
60 R  R  R  1  1  15 mm\0.59 inch
80 R  R  R  R  1  35 mm\1.37 inch
Notes:
1). R = Reject in all cases
2). The values (1, 2, 4, 5) in the table represent the maximum QUANTITY of digs allowed for a specified dig number and measured dig size within any 0.80 inch (20 mm) diameter circle of a part.
3). The Minimum Spacing represents the closest distance allowed between acceptable digs within any 0.80 inch (20 mm) diameter circle of a part.

以上是我找到的关于表面质量的资料.有一点我很不了解:20以下的擦痕以及疵点怎么考核?
哪位大侠可以解答?最好详细点.

谢谢先!

xujexy · 发表于 2003-8-7 18:29:00

请你看美军标，本坛上有

xujexy · 发表于 2003-8-9 17:56:00

To：我是新人
你能把你的标准完整的帖出来，或者给我email一份，怎么样？谢谢你！

我是新人 · 发表于 2003-8-10 06:18:00

关于表面质量我就这么一些。
其他部分与此无关。不好意思，我们可以讨论讨论。

xujexy · 发表于 2003-8-10 21:12:00

不一定光学表面质量，我对光学的都感兴趣；我作过好多光学工作，你能告诉我“它”出处哪儿？

我是新人 · 发表于 2003-8-12 05:45:00

某著名公司的内部资料（仅限合作伙伴）。

wayne · 发表于 2003-8-21 22:08:00

我有完整计算痕量体系,可与我联系

抛砖引玉-关于表面质量