1、FORD LABORATORY TEST METHOD BN 108-13 2001 O924 RESISTANCE TO SCRATCHING Revised Editorial - no technical change A. Cockman Application This procedure is used to determine the resistance to scratching on surfaces of plastic or other materials under standard conditions. Apparatus Required Mec han ica
2、lly Driven Scratch Apparat us Apparatus is a movable sledge with five metal fingers - 250 mm long, one end fixed, the other end of fingers are supplied with interchangeable scratch pins (steel balls, highly polished, 7.0 +/- 0.2 mm or 1.0 +/- 0.1 mm diameter). The pins are loaded with different weig
3、hts exerting the following standard forces on the surface of test material: Scratch finger No. 1 7.0 N 2 6.0 N 3 4.5 N 4 3.0 N 5 2.0 N Note: If necessary it is possible to movekhange the weight($ on the scratch finger(s) so that force($ can be differentiated. The complete apparatus should be purchas
4、ed from the following: Toolmakers Dept. NZ/MF-I 72, Ford-Werke AG Postfach604002 D-50725 Koeln West Germany Phone: 221-90-15841 Fax: 221 -90-1 6691 Spring Balance 1 O N maximum or functionally equivalent electronic force transducer I Date I Action I Revisions I Copynght02001, Ford Global Technologie
5、s, Inc COPYRIGHT Ford Motor CompanyLicensed by Information Handling ServicesFORD LABORATORY TEST METHOD BN 108-13 Viewing Cabinet As described in FLTM BI 109-01 Stop Watch - with analog display Injection Molding Equipment Demag D 100 or equivalent, with Ford Test Tool or equivalent, with specified g
6、rain insert and with electronic control (NC 2 or equivalent) to produce consistent molding conditions. Evaluation Camera Sony XC-77CE monochrome camera or equivalent. Electronic Plotter Station Including Software Package* Seescan 512 Satellite Image Analyzer with a real time clock, Monitor, Seescan
7、Custom II Lighting Unit including ND8 filter, software ”Scratch Assessment System, Version 1 VOO”, or equivalent software. Source: Seescan PIC, Unit 9 25 Gwydir Street Cambridge CBI 2LG United Kingdom Samples for Visual Evaluation Flat, recommended size 200 x 150 mm; smaller samples are acceptable i
8、f extracted from finished parts. Samples for Instrumental Evaluation by Using Image Analysis Technique Test plaques, approx 200 x 150 mm size, produced on a central sample tool only by using optional molding conditions. Conditioning and Test Conditions All test values indicated herein are based on m
9、aterial conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Install the specified scratch pins, 1.0 or 7.0 mm diameter balls as specified by the re
10、levant engineering document, under the fingers. Note: For instrumental evaluation by using Image Analysis Technique: only 1 .O mm diameter balls are allowed. Page 2 of 5 Copynght02001, Ford Global Technologies, Inc COPYRIGHT Ford Motor CompanyLicensed by Information Handling ServicesFORD LABORATORY
11、TEST METHOD BN 108-13 4. 5. 1. 2. 3. 4. 5. 1. Check the loading forces, measured directly at the scratch pin by using spring balance. If necessary change the weight($ to meet the required scratch force(s) on the surface of sample. Place the sample - grain on the top - with the short side of sample u
12、nder the five scratch fingers and push them one time from right to left across the sample at the rate of approximately 100 mm per second, length of scratch lines approx. 1 O0 mm. Control the scratch speed by using a stop watch. Note: The complete distance the between starting and ending point of the
13、 scratch fingers of the equipment is approximately 200 mm so that a whole scratch movement is outlined in approximately 2 sec. Mark the direction of outlined movement. Select the technique for the evaluation of the scratch marks: visual evaluation or Instrumental evaluation. Visual Evaluation Use no
14、rth sky day light according to FLTM BI 109-01 Place the sample under the light so that the scratch lines are in a horizontal position to the observer. The scratch line caused by the highest weight should be at the upper position. Change the angle of part to the observer so that during swinging the p
15、art the scratch lines emerge at the clearest visibility. Examine all scratch lines according to a Rating Scale 1 to 5 (1 = no scratch line at all; 5 = severe scratch line). Report the stylus loading which meets Rating 1 (no visible scratch line at all) on the surface of sample. Note: Starting and en
16、ding point of the scratch lines (approx. 10 mm) shall not enter into the evaluation. Instrumental Evaluation (Image Analysis System) Place the sample at a 90“ angle to the camera objective (horizontal) so that the objective can register the central section (approx 60 mm) of each scratch line only. D
17、istance sample surface/camera objective: 225 +/- 5 mm Page 3 of 5 Copynght02001, Ford Global Technologies, Inc COPYRIGHT Ford Motor CompanyLicensed by Information Handling ServicesFORD LABORATORY TEST METHOD BN 108-13 2. Use the electronic plotter with the relevant software package. Take 250 evaluat
18、ion profiles perpendicular to the scratch lines at predetermined intervals. Note: Record the integration part of each electronic signal for each scratch line and eliminate samples background shade. Record the light of each electronic signal and eliminate samples background shade. The result of steps
19、 b and c gives the relative grey value in direct comparison to the intensity of the scratch marks. In case of irregular scratch lines, manual override possible. 3. Report the percentage of visible marking of the scratch which are produced by the defined force as specified in the relevant material sp
20、ecification. 4. Steps 1 to 3 are to be carried out on two test specimens. Note: More details of instrument evaluation procedure are outlined in the user guide of the relevant software package. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. E
21、ach party is responsible for determining proper use and handling in its facilities. Page 4 of 5 Copynght02001, Ford Global Technologies, Inc COPYRIGHT Ford Motor CompanyLicensed by Information Handling ServicesFORD LABORATORY TEST METHOD BN 108-13 RESISTANCE TO SCRATCHING Figure 1 Page 5 of 5 Copynght02001, Ford Global Technologies, Inc COPYRIGHT Ford Motor CompanyLicensed by Information Handling Services
