EN 14157:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskusne metode za naravni kamen - Ugotavljanje odpornosti proti obrabiPierres naturelles - Détermination de la résistance à l'usureNatural stone test methods - Determination of the abrasion resistance91.100.15Mineralni materiali in izdelkiMineral materials and products73.020Rudarstvo in kamnolomsko izkopavanjeMining and quarryingICS:Ta slovenski standard je istoveten z:EN 14157:2017SIST EN 14157:2017en,fr,de01-december-2017SIST EN 14157:2017SLOVENSKI
STANDARDSIST EN 14157:20041DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14157
October
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{ sä s r rä s w Supersedes EN
s v s w yã t r r vEnglish Version
Natural stone test methods æ Determination of the abrasion resistance Pierres naturelles æ Détermination de la résistance à l 5usure
This European Standard was approved by CEN on
t r July
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egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
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s v s w yã t r s y ESIST EN 14157:2017

Key 1 clamping trolley 8 counterweight 2 fixing screw 9 slot 3 specimen 10 groove 4 control valve 11 abrasive material flow 5 storage hopper 12 abrasive collector 6 flow guidance hopper 13 wedge 7 wide abrasion wheel
Figure 1 — Principle of the wearing machine The wide abrasion wheel shall be made of steel Fe 690 according to EN 10025. The hardness of the steel shall be between 203 HB and 245 HB. Its diameter shall be (200 ± 1) mm and its width shall be (70 ± 1) mm. It shall be driven to rotate 75 revolutions in (60 ± 3) s. A mobile clamping trolley is mounted on bearings and forced to move forwards to the wheel by a counterweight having a mass of (14 ± 0,01) kg. The storage hopper containing the abrasive material feeds a flow guidance hopper. SIST EN 14157:2017

Key 1 inclined side 2 vertical side a, b, c
· 10 6 flow guidance hopper 9 slot Figure 2 — Position of the slot at the base of the flow guidance hopper in case of cylindrical cross section (left) and of rectangular cross section (right) The distance of the fall between the slot and the axle of the wide abrasion wheel shall be (100 ± 5) mm and the flow of abrasive shall be (1 to 5) mm behind the leading edge of the wheel (see Figure 3). SIST EN 14157:2017

Key 3 specimen 6 flow guidance hopper 7 wide abrasion wheel 9 slot A distance of the flow of abrasive from the leading edge of the wheel (from 1 to 5) mm. Figure 3 — Position of the slot relative to the wide abrasion wheel for a cylindrical cross section of the flow guidance hopper (left) and for a rectangular cross section of the flow guidance hopper (right) The flow of the abrasive material from the flow guidance hopper shall be at a minimum rate of 2,5 litres per minute onto the wide abrasion wheel. The flow of abrasive shall be constant and the minimum level of the abrasive in the flow guidance hopper shall be 25 mm (see Figure 3). 3.3.2 Magnifying glass A magnifying glass having at least 2 × magnification and preferably equipped with a light. 3.3.3 Ruler A st
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