参数资料
型号: 0639004500
厂商: Molex Inc
文件页数: 15/24页
文件大小: 0K
描述: FINE ADJUST APPLICATOR
RoHS指令信息: 0639004500 Cert of Compliance
标准包装: 1
系列: FineAdjust™, Micro-Fit 3.0™
工具类型: 台式压机,施用器
适用于相关产品: 矩形触点,20-24 AWG
配用: WM2777CT-ND - CONN TERM MALE 20-24AWG GOLD
WM2776CT-ND - CONN TERM FEMALE 20-24AWG 30GOLD
WM2777TR-ND - CONN TERM MALE 20-24AWG GOLD
WM2776TR-ND - CONN TERM FEMALE 20-24AWG 30GOLD
WM1127CT-ND - CONN TERM MALE 20-24AWG GOLD
WM1841CT-ND - CONN TERM MALE 20-24AWG TIN
WM1125CT-ND - CONN TERM FEMALE 20-24AWG GOLD
WM1837CT-ND - CONN TERM FEMALE 20-24AWG TIN
WM1127TR-ND - CONN TERM MALE 20-24AWG GOLD
WM1841TR-ND - CONN TERM MALE 20-24AWG TIN
更多...
相关产品: WM3459-ND - TM3000 220V/50HZ PRESS TO 10AWG
WM6378-ND - PRESS TM4000 UP TO 4AWG 240AC
WM4793-ND - CRMP PRESS TM3000 120V TO 10AWG
其它名称: 063900-4500
63900-4500
639004500
WM3461
Quality Crimp Handbook
SECTION 8
CRIMP PROCESS CONTROL
The crimp process is the interaction of a terminal, wire,
tooling, personnel, methods and procedures, and
environmental attributes. When this process is
controlled, it will produce a quality termination. Quality
control is an important part of quality crimping. It
should not take excessive setup or inspection time to
do, and it can save a harness manufacturer thousands
of dollars in potential rework or re-manufacturing.
Variability is the slight change that occurs from crimp to
crimp. There are two types of variability, common or
special. Common causes of variation affect the
process uniformly and are the result of many small
sources. Common variability is inherent tolerances
within a reel of wire or terminals. Common variability
also is created by the natural tolerances of the stripping
and crimping machines.
Reducing variability at the common level typically has
* PPM - Parts per million potential defects.
A 25 piece minimum sample needs to be taken from
the crimping process. Calculate the average and
standard deviation for the sample. A capability index is
defined by the formula below. C p may range in value
from zero to infinity, with a larger value indicating a
more capable process. A value greater than 1.33 is
considered acceptable for most applications. C p is
calculated with the following formula.
___Tolerance___
6*Standard Deviation
The C pk index indicates whether the process will
produce units within the tolerance limits. C pk has a
value equal to C p if the process is centered on the
mean of specification; if C pk is negative, the process
mean is outside the specification limits; if C pk is
between 0 and 1 then some of the 6 sigma spread falls
outside the tolerance limits. If C pk is larger than one,
the 6-sigma spread is completely within the tolerance
limits. C pk is calculated with the lesser of the following
formulas:
to come from changes to the wire, terminal, and tooling
manufacturer.
__(USL - Mean)__
3*Standard Deviation
__ (Mean - LSL)__
3*Standard Deviation
Special causes of variation occur irregularly and
unpredictably. Without checks throughout a run, having
a tool become loose after the first hundred crimps or a
jam resulting from a damaged tool may be undetected
until thousands of crimps are made.
Process Capability
Before putting a new crimping tool in production, Molex
recommends that each customer do a capability study,
using the specific wire that will be used in its process.
A capability study, which is based on the assumption of
a normal distribution (bell-type curve), estimates the
probability of a measurement being outside of
specification.
USL = Upper Specification Limit, LSL = Lower
Specification Limit
Six sigma is a goal of many companies because it
represents virtually zero defects. The ability of a
company to achieve a six-sigma level depends on the
amount of common variability in its process. For
example, hand stripping the wire produces more
variability than a stripping machine; crimping hand tools
produce more variability than a press and die set, and
bench terminations produce more variability than a
wire-processing machine.
A part of the variability in crimping will result from the
type of instruments that are used to measure the parts
C pk
0.67
1
1.33
1.67
2
Capability
+/- Sigma % Yield
2 95.45
3 99.73
4 99.99
5 99.99+
6 99.99++
PPM*
45,500
2,699
63
0.57
0
and the operator's ability to repeat the measurement. A
crimp micrometer will measure more accurately than a
dial caliper. An automatic pull force system will
measure better than a hook type scale. It is important
that the measurement gauge has enough resolution.
Order No: TM-638000029
Revision: D
Release Date: 09-04-03
Revision Date: 12-23-09
UNCONTROLLED COPY
Page 15 of 24
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