1、May 2010Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.1
2、00.01!%+fT“2086749www.din.deDDIN 52108Testing of inorganic non-metallic materials Wear test using the grinding wheel according to Bhme Grinding wheel method,English translation of DIN 52108:2010-05Prfung anorganischer nichtmetallischer Werkstoffe Verschleiprfung mit der Schleifscheibe nach Bhme Schl
3、eifscheiben-Verfahren,Englische bersetzung von DIN 52108:2010-05Essai des matriaux inorganiques non-mtalliques Essai dusure la meule daprs Bhme Mthode de la meule,Traduction anglaise de DIN 52108:2010-05SupersedesDIN 52108:2007-01www.beuth.deIn case of doubt, the German-language original shall be co
4、nsidered authoritative.Document comprises 10 pages04.14 DIN 52108:2010-05 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 4 4 Principle . 4 5 Apparatus 4 6 Specimens . 7 7 Procedure 7 8 Evaluation 9 9 Test report . 10
5、 DIN 52108:2010-05 3 Foreword This document has been prepared by Technical Committee NA 062-03-13 Gesteinskrnungen, Prfverfahren, Petrographie, Probenahme und Przision of the Normenausschuss Materialprfung (Materials Testing Standards Committee). Attention is drawn to the possibility that some of th
6、e elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN 52108:2007-01 as follows: a) further designs of the force sensing device which may be allowed under certain circ
7、umstances are described in 5.2.4. Previous editions DIN DVM 2108: 1933-03 DIN DVM 2108 = DIN 52108: 1939-10 DIN 52108: 1965-08, 1968-08, 1988-08, 2002-07, 2007-01 DIN 52108:2010-05 4 1 Scope This standard specifies a rotating disc method for determining the wear of inorganic, non-metallic materials
8、caused by sliding particles. The type of stress is wear by grain abrasion. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispens-able for its application. For dated references, only the edition cited applies. For undated re
9、ferences, the latest edition of the referenced document (including any amendments) applies. DIN 878, Dial gauges DIN EN ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method 3 Terms and definitions For the purpose of this document, the following term and definition applies. 3.1 we
10、ar progressive loss of material from the surface of a solid body due to mechanical action resulting from relative movement while the surface is in contact with a solid, liquid or gaseous body 4 Principle After 20 g of standard abrasive have been spread over the test track, specimens in the form of s
11、quare plates or cubes having a test face area of (50 2) cm2are held against the test track of the Bhme rotating disc. The disc is then rotated at a speed of (30 1) min1 with a load of (294 3) N applied for 16 test cycles, each comprising 22 revolutions. At the end of each test cycle, the test face o
12、f the specimen is rotated through 90 (always in the same direction) and the standard abrasive is replaced. The wear is determined as a loss of either thickness or volume. 5 Apparatus 5.1 Thickness measuring device A dial gauge conforming to DIN 878-A with a suitable anvil for measuring thickness los
13、s. It shall have a test plunger that has a ball bearing mounting and has an annular contact surface with an external diameter of 8 mm and an internal diameter of 5 mm. 5.2 Wear tester Essentially, the Bhme wear tester as shown in Figure 1 consists of a rotating disk having a test track, a specimen h
14、older and a loading device. DIN 52108:2010-05 5 NOTE The design is for illustrative purposes only; however, the dimensions shall be as specified. Key 1 Counterweight 2 Specimen holder 3 Specimen 4 Test track 5 Load 6 Rotating disc Figure 1 Wear tester 5.2.1 Rotating disc The rotating disc has a diam
15、eter of approx. 750 mm; it shall be set up so as to be in horizontal position and lie flat. The axis of the rotating disc shall be positioned vertically. With the load applied, the rotating speed shall be (30 1) mm . 1The rotating disc shall be equipped with a revolution counter and a device that st
16、ops it automatically after 22 revolutions. 5.2.2 Test track The test track shall be a 200 mm wide annular surface on the rotating disc with an internal diameter of 120 mm and an external diameter of 320 mm measured from the axis of the disc. It may be replaceable. The test track shall be made of cas
17、t iron having a pearlitic structure with a phosphorus content by mass not exceeding 0,35 % and a carbon content by mass exceeding 3,0 %. Its Brinell hardness shall be determined as specified in EN ISO 6506-1 and the mean of measurements made at no fewer than ten points along the outer edge of the tr
18、ack shall be between 190 and 220 HB 2,5/187,5. The side of the track facing the specimen shall have a fine finish and, if possible, the finish on both sides shall be such that both sides can be used. The wear of the test track during service shall not exceed 0,3 mm and individual grooves shall not b
19、e more than 0,2 mm deep. If these values are exceeded, the track shall be replaced or reconditioned. After being reconditioned three times, its Brinell hardness shall be determined again.Dimensions in millimetresDIN 52108:2010-05 6 5.2.3 Specimen holder The specimen holder shall be a U-shaped frame
20、about 40 mm thick positioned with its lower edge (5,0 1,0) mm above the test track. It shall be located so that the centre of the specimen is 220 mm from the centre of the rotating disc, and the bar holding the specimen shall support it (4,0 1,0) mm above the track (see 5.2.4). The mounting shall be
21、 such as to prevent vibration during testing. 5.2.4 Loading device The loading device shall be a lever having two arms of different lengths, a load and a counterweight. Mounted with a bearing friction that is as low as possible, the lever shall be virtually horizontal during testing. The plunger sha
22、ll transmit the load vertically to the centre of the specimen. The intrinsic weight of the lever shall be balanced by the counterweight and by the pan to take the load. The test force acting on the specimen shall be adjusted to (294,0 3,0) N (equivalent to 5,88 N/cm2 0,06 N/mm2) by a suitable choice
23、 of load. That the test force is correct shall be checked by calculation, i.e. by multiplying the load by the leverage ratio. Other types of loading device may be used if the requirements relating to the pressing force are met. It has to be made sure that the test force is acting right in the centre
24、. 5.3 Standard abrasive (Intermediate material) The standard abrasive1)shall be an artificial corundum that produces a wear of 1,10 mm to 1,30 mm and of 4,20 mm to 5,10 mm when used to test standard granite2)and standard limestone2)specimens, respectively. The artificial corundum shall meet the foll
25、owing requirements: Al O content 2 3 99,3 % (mass percentage); bulk density = (1,48 0,07) g/cm3; particle size distribution as shown in Table 1. Table 1 Particle size distribution of the standard abrasive Screen aperture size mm Undersize % (mass percentage) 0,125 90 to 100 0,063 5,0 The maintenance
26、 of the abrasive action and compliance with the above requirements shall be monitored by an independent laboratory3). Since the corundum particles tend to separate, the standard abrasive shall preferably be packed in containers holding 1 kg. If larger containers are used, portions shall only be take
27、n from them using a rotary divider. _ 1)Information on sources of supply of standard abrasives is obtainable from the Normenausschuss Materialprfung, Burggrafenstrae 6, Postfach 1107, D-10787 Berlin. 2)These materials shall be stocked by the independent laboratory responsible for inspecting standard
28、 abrasives. 3)Information on inspection agencies is obtainable from the Normenausschuss Materialprfung, Burggrafenstrae 6, Postfach 1107, D-10787 Berlin. DIN 52108:2010-05 7 6 Specimens 6.1 Shape and preparation The specimens shall be square plates or cubes having a test face edge length of (71,0 1,
29、5) mm. Determination of the loss in thickness as described in 7.2 requires the test face and the opposite face of the specimen to be parallel and flat. Any deviation from this requirement shall be corrected by machining or grinding. 6.2 Conditioning As a rule, the specimens shall be dried to constan
30、t mass at (110 5) C. The test face shall normally be pre-ground as described in Clause 7 for four test cycles (see 7.4.3). NOTE If the specimens are to be damp or water-saturated (see 7.4.4) when tested, they shall be immersed in water for not less than seven days and wiped with a slightly moist spo
31、nge or cloth before each weighing so that the surfaces of the specimens always have the same damp appearance. 6.3 Number of specimens One specimen shall normally be taken from no fewer than three separate samples or work pieces of the same type. 7 Procedure 7.1 Abrasive wear Determine the abrasive w
32、ear either as a thickness loss (7.2) or as a volume loss (7.3). 7.2 Thickness loss Before testing as specified in 7.4 and after every four test cycles (7.4.3), carefully clean the specimen and place it with its test face uppermost on the dial gauge anvil (5.1). Using the gauge, make a total of nine
33、measurements to an accuracy of 0,01 mm at the positions shown in Figure 2. DIN 52108:2010-05 8 Dimensions in millimetres Figure 2 Arrangement of test points 7.3 Volume loss Before testing the specimen as specified in 7.4, determine its density, R, from its dimensions and weight measured to accuracie
34、s of 0,1 mm and 0,1 g, respectively. Determine the density of multilayer specimens using specimens taken separately from the layer subject to wear. If necessary, pre-grind the specimens. Weigh the specimen to an accuracy of 0,1 g before every test and after every four test cycles (see 7.4.3). 7.4 We
35、ar test 7.4.1 Specimen mounting Evenly spread 20 g of standard abrasive over the test track, then clamp the specimen in the specimen holder with the test face facing the track and apply a load of (294 3) N centrically. 7.4.2 Grinding After clamping the specimen in its holder, start the rotating disc
36、. Continuously return any scattered abrasive to the test track, ensuring that it remains evenly distributed over a path with a width equal to that of the specimen. 7.4.3 Test cycle Subject the specimen to 16 test cycles, each consisting of 22 revolutions. DIN 52108:2010-05 9 7.4.4 Cleaning After eac
37、h test cycle, clean the rotating disc and the test face of the specimen. Rotate the test face through 90 (always in the same direction) and spread fresh abrasive over the test track as described in 7.4.2. To test damp or water-saturated specimens, clean and moisten the test track with a slightly moi
38、st sponge prior to every test cycle before spreading the standard abrasive over it. Starting from the beginning of the test, apply about 13 ml of water per minute as 180 to 200 drops to the test track from a container having an adjustable pivoting nozzle. Allow the drops to fall from a height of abo
39、ut 10 cm onto the centre of the test track 3 cm in front of the specimen, continuously returning any scattered abrasive to the track. 8 Evaluation Determine the abrasive wear of the specimen after 16 cycles as the mean specimen thickness loss, l, in mm, or as the specimen volume loss, V, using Equat
40、ions (1) or (2) respectively. The mean specimen thickness loss, l, can be calculated from the specimen volume loss, V, using Equation (3): m16m0lll = (1) RmV= (2) AVAml=R(3) In Equations (1) to (3): l is the mean thickness loss after 16 cycles; l0mis the mean of the measurements at all 9 test points
41、 before starting the test; l16m is the mean of all 9 measurements after completion of the test; V is the loss in volume after 16 cycles; m is the loss in mass after 16 test cycles; Ris the density of the specimen or in the case of multilayer specimens, the density of the wearing layer; A = 50 cm2(if
42、 the test face area differs from this value, conversion to 50 cm2is unnecessary provided that the dimensional tolerances are maintained). DIN 52108:2010-05 10 9 Test report The test report shall refer to this standard and include the following information: a) type of material; b) sampling; c) specim
43、en preparation and conditioning; d) specimen dimensions; e) number of specimens; f) individual and mean values of abrasive wear either as a mean loss in thickness, l, in mm, to an accuracy of 0,02 mm or as a loss in volume, V, in cm3per 50 cm2of test surface, to an accuracy of 0,1 cm3; g) density, R, in g/cm3, to an accuracy of 0,01 g/cm3, if the abrasive wear is reported as a loss in volume.
