Klass. Nr. 50 20 2 November 2002
the permission of a Standards Department of the Volkswagem Group. Parties to a contract can only obtain this standard via the responsible procurement department. ©VOLKSWAGEN AG
T h e E n g l i s h t r a n s l a t i o n i s b e l i e v e d t o b e a c c u r a t e . I n c a s e o f d i s c r e p a n c i e s t h e G e r m a n v e r s i o n s h a l l g o v e r n .
F r o m F E 41- 12.00
Q U E L L E : N O L I S
C h e c k s t a n d a r d f o r c u r r e n t i s s u e p r i o r t o u s a g e
Page 2
VW501 95: 2002-11
3.2 Test angle
闪蒸塔
3.2.1 Solid paint
Primary measurements under one lighting and observation angle suffice to describe the color due to the reflective behavior of solid paints.
Suitable measurement shapes are as follows: 45/0 or 0/45 (according to DIN 5033-7, sections 3.2.1 or 3.2.2 respectively). The lighting shape can be circular in the case of shape 45/0, the observation shape can be circular in the case of shape 0/45 (see DIN Report 49, section 3.3, Measurement shapes, Method B).
cielabDifferent agreements shall be arranged with the relevant responsible departments of the marque. 3.2.2 Effect paint
Effect colors must be measured under 5 observation angles at a lighting angle of 45 or its inverse (see DIN 6175-2 section 4.1 + test angle 45/15 or 15/45).
Different agreements shall be arranged with the relevant responsible departments of the marque. 3.2.3 Calibration and test equipment inspections
Calibration shall be performed according to the manufacturer’s specifications. The calibration shall be checked by means of a control measurement on a bright color standard. The differences in color r
eferred to the initial measurement of the color standard shall be logged for all test angles. The color shall differ by no more than 1/6 of the prescribed tolerance. If this value is exceeded, the measurement system shall no longer be used within the context of this standard. The test equipment shall be monitored at regular intervals through control measurements on multiple bright color standards. Test standards whose surface and color appearance remain constant shall be used for this purpose. Appropriate measures shall be taken if inconsistent values are determined (device adjustment or maintenance).
3.3 Test light type/normal observer
The test light types are D65/10 and F11/10.
Different agreements shall be arranged with the relevant responsible departments of the marque. 3.4 Specimen appearance
The specimen surface must not be impaired by surface flaws (dirt, scratches, craters, polish marks, etc.). the packaging material shall be selected accordingly. Specimens can only be cleaned in exceptional cases. This must be noted in the test record.
Page 3
VW 501 95:2002-11 3.5 Procedure
3.5.1 Measurable components
The measuring point on the specimen should be as flat as possible since the specified angular arrangement cannot be adhered to on curved surfaces. The measuring points should be agreed upon with the testers. The color data for a measuring location shall be formed form the mean of at least 5 individual measurements. A method that automatically rules out freak values such as SMC, for example, shall preferably be selected here.
The reference and specimen measurements shall be taken at constant room temperature.
3.5.2 Non-directly measurable components
Specimens which cannot be directly measured because of their shape can be checked as follows: a) Measurement of a flat test panel painted at the same time (at least 50 mm X 100 mm), with the same substrate and structure as the component. There shall be no visual color difference between the component and the test panel. This shall srve as a specimen for the color measurement.
b) The measurement shall be performed using suitable gages.
The exact position of the test panels and the type and setup of the gages shall be agreed with the testers.
3.6 Reference
The color changes shall be calculated with respect to the defined reference according to DIN 6174. 4. REQUIREMENTS
4.1 Basic specifications
Revisions of the scaling and weighting factors due to technical factors may be made in the production phase. These parameters shall be defined by the relevant process engineering department of the marque.
4.1.1 scaling factors S(dL,da,db,dC, dh),γ
The size of the scaling factors depends on the color locus. It takes into consideration the influence of the color locus on the visual acceptance of chromatic aberrations.
4.1.2 Weighting factors Gγ
The size of the weighting factors depends on the type of connection (direct or indirect transitions).
Page 4
VW 501 95:2002-11
4.2 Overall color change dEγ‘
The overall color change dEγ‘ is calculated as a function of the scaling factors according to:
4.3 Release procedure
4.3.1 Procedure A
This procedure evaluates the maximum, angle-dependent overall color change maxdE’ Max dE=max(dEγ‘)
-acceptance range 0 ≤ max dEγ‘ ≤ 1.4
Components/sample parts are in acceptable range.
-Control range 1.4 < max dEγ‘≤1.7
Components/sample parts are in conditionally acceptable range
-Rejection limit max dEγ‘ > 1.7
Components/sample parts are outside the tolerance range =unacceptable.
4.3.2 Procedure B
This procedure evaluates the overall color change mdE’ determined via the angle:
Mean overall color change:
-Acceptable range 0≤mdE’≤1.4
Components/sample parts are in acceptable range.
药盒
Boundary condition: max dE≤1.7
-Control range 1.4<max dE’≤1.7
Components/sample parts are in conditionally acceptable range.
Boundary condition: max dE’≤2.0.
-Rejection limit mdE’>1.7
-Components/sample parts are outside the tolerance range=unacceptable.
Page 5十轮自卸车
VW 501 95:2002-11 5. TEST REPORT
The test report shall specify the absolute values of the reference, the scaling and weighting factors as well as the overall color changes max dE’.
The test report must also contain the following information:
-Test apparatus
-Paint number(VW L-…), number and date of issue of the reference used
-Any obsevations and changes, such as particles of dirt, hazing, scratches, patchiness, etc. -Agreed upon conditions that deviate from this standard (e.g. standardized color values).
烫贴6. REFERENCED STANDARDS
-DIN 5033-4 Colorimetry: Spectral Method
中频
淬火变压器-DIN 5033-7 Colorimetry Measuring Conditions for Object Colors
-DIN 6172 Colorimetry: Metamerism Index of Paired Specimens with Illuminant Change
-DIN 6174 Colorimetric Determination of Color Intervals with Object Colors According to the CIELAB Formula.
-DIN 6175-2 Color Tolerances for Automobile Paint Coatings-Part 2: Effect Paint Coatings
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议