1、BRITISH STANDARD BS ISO 14368-3:2003 Mineral and sapphire watch-glasses Part 3: Qualitative criteria and test methods ICS 39.040.10 BS ISO 14368-3:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 December 2003 BSI 4 December 2003 ISBN 0
2、 580 43019 7 National foreword This British Standard reproduces verbatim ISO 14368-3:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee STI/53, Specifications and test methods for jewellery and horology, which has the resp
3、onsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International
4、 Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British St
5、andard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Euro
6、pean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendmen
7、ts issued since publication Amd. No. Date Comments Reference number ISO 14368-3:2003(E) OSI 3002INTERNATIONAL STANDARD ISO 14368-3 First edition 2003-08-01 Mineral and sapphire watch-glasses Part 3: Qualitative criteria and test methods Verres de montres minraux et en saphir Partie 3: Critres qualit
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13、O 3002 All irhgts seredevr iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols . 2 5 Criteria 3 6 Test under static load . 5 7 Measuring surface stress. 6 Annex A (informative) Method of checking the appearance 8 BSISO143683:2003IS-86341 O3:(3002E)
14、iv I SO 3002 All irhgts seredevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body inter
15、ested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
16、 Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the te
17、chnical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IS
18、O shall not be held responsible for identifying any or all such patent rights. ISO 14368-3 was prepared by Technical Committee ISO/TC 114, Horology, Subcommittee SC 13, Watch- glasses. ISO 14368 consists of the following parts, under the general title Mineral and sapphire watch-glasses: Part 1: Dime
19、nsions and tolerances Part 2: Assembly to the case by adhesive or using a gasket Part 3: Qualitative criteria and test methods BSISO143683:2003INTENRATIONAL TSANDADR IS-86341 O3:(3002E)I SO 3002 All irhgts seredevr 1Mineral and sapphire watch-glasses Part 3: Qualitative criteria and test methods 1 S
20、cope This part of ISO 14368 specifies the nomenclature of defects and the test methods to check them, with minimum physical and aesthetic requirements, for circular mineral and sapphire watch-glasses. 2 Normative references The following referenced documents are indispensable for the application of
21、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 286-1, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits ISO 286-2, ISO system of limits and
22、 fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts ISO 14368-1:2000, Mineral and sapphire watch-glasses Part 1: Dimensions and tolerances 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 286-1, ISO 286-2 and IS
23、O 14368-1 and the following apply. 3.1 defect fault occurring during manufacture of the material, machining and handling of mineral and sapphire watch- glasses 3.2 chip chipped edge 3.3 scratch continuous or discontinuous groove with dulled or shattered sides, the width and depth of which may be irr
24、egular 3.4 wave effect internal defect in the glass BSISO143683:2003IS-86341 O3:(3002E) 2 I SO 3002 All irhgts seredevr3.5 flaw localized superficial defect 3.6 stain local defect caused by chemical attack or deposit 3.7 greying defect modifying transparency locally, or poorly polished areas (very s
25、light grooves or spots) 3.8 orange peel polishing defect 3.9 deep defect bubble concentration of small bubbles crystallization defects EXAMPLE Twinning, particle joint, etc. 3.10 vibrations external glass faults 4 Symbols See Figure 1 and ISO 14368-1:2000, Clause 3, for an explanation of the symbols
26、. Figure 1 Details of designations BSISO143683:2003IS-86341 O3:(3002E) I SO 3002 All irhgts seredevr 35 Criteria 5.1 Hardness 5.1.1 Methods of verification Preferably use the Knoop imprint method because it is more suitable for the verification of chemically treated glasses. As an alternative, the V
27、ickers imprint method may also be used. 5.1.2 Chemically treated glasses In the case of glasses treated chemically, the hardness varies considerably as a function of the load. The effect of the layer under strain begins to appear with loads of less than 2 N. A load of this magnitude shall not be use
28、d for measuring purposes. 5.1.3 Distinction between hardness values A distinction shall be drawn between the hardness in the depth of the material, which is measured with a load of the order of 10 N and is relatively constant for a particular type of glass, and the surface hardness measured under a
29、load of 0,15 N, which is greatly influenced by the treatment which the glass has undergone. To eliminate these variations, the measurements shall be taken under a load of 1 N. The values shown in Table 1 were obtained with this load. 5.2 Ball impact fracture energy 5.2.1 Support The support consists
30、 of a block of metal (generally brass) recessed to a diameter d + 0,50 mm and with a hole of diameter d 2 mm. See Figure 2. Dimensions in millimetres Figure 2 Details of the support 5.2.2 Test device The test device is schematically shown in Figure 3. BSISO143683:2003IS-86341 O3:(3002E) 4 I SO 3002
31、All irhgts seredevrKey 1 ball held magnetically 2 height of the drop 3 glass fitted without mechanical stress Figure 3 Diagram of the test device For the test to be performed under correct conditions, the ball shall be centered on a cone and held by a magnet or an electro-magnet which is not in cont
32、act with the cone. The diameter of the steel ball used for the test shall be 25 mm and its weight 0,635 N. As a variant, some instruments may use a steel ball with a diameter of 20 mm and a weight of 0,3 N. 5.2.3 Test procedure Make sure that the ball, released from its highest point, drops into the
33、 centre of the support. Place the glass in its support. Perform a first test, which shall not cause the glass to break when the ball drops. Then perform a series of successive tests, increasing the height of the drop by 25 mm each time until the glass breaks. 5.2.4 Breakage energy The breakage energ
34、y is the product of the weight of the ball, expressed in newtons, and the height of the drop, expressed in metres, that caused the glass to break. The results obtained for mineral and sapphire glasses with a thickness of 1 mm shall be within the limits stated in Table 1. BSISO143683:2003IS-86341 O3:
35、(3002E) I SO 3002 All irhgts seredevr 5Table 1 Criteria for verification of glass mechanical properties Mineral glasses Criteria Class 1 Class 2 Sapphire glasses Hardness HK 0,1 550 to 650 475 to 550 1 800 to 2 200 Breakage energy (in 10 4N m) 1 600 to 2 100 700 to 1 600 800 to 1 800 NOTE 1 Mineral
36、glasses of Class 1 represent the highest quality. NOTE 2 The values given in this table correspond to glasses with a thickness of 1 mm and a diameter of 22 mm to 30 mm, placed in position without mechanical restraint for the ball drop test. NOTE 3 For treated glasses, the breakage energy increases u
37、p to 50 % if the glass diameter is between 22 mm and 30 mm. NOTE 4 For treated glasses, the breakage energy increases by around 115 % if the glass thickness is doubled. NOTE 5 “Hardness HK 0,1” signifies that the test was performed under a load of 1 N. 6 Test under static load 6.1 General The purpos
38、e of this test is to determine whether the mineral glass has undergone hardening and reinforcement. 6.2 Support This support comprises a metal annular block (generally made from brass) with a hole of diameter 14 mm. A rubber plate, 0,5 mm thick, is placed on the surface accommodating the glass under
39、 test. This rubber plate, the hardness of which varies between 60 and 80 Shore A, also has a hole, the diameter of which is slightly smaller than that of the support. Key 1 rubber plate (0,5 mm thick) Figure 4 Details of the support BSISO143683:2003IS-86341 O3:(3002E) 6 I SO 3002 All irhgts seredevr
40、6.3 Test device The test device is schematically depicted in Figure 5. Key 1 glass 2 rubber plate (0,5 mm thick) 3 steel ball (D = 3,175 mm) 4 support Figure 5 Diagram of the test device 6.4 Test procedure Place the glass, without mechanical restraint, on the rubber plate in the centre of the suppor
41、t. Place a steel ball of diameter 3,175 mm at the centre of the mineral glass under test, and apply a load of 300 N to the ball. This load is used for mineral glass with a thickness of 1 mm and a diameter of 22 mm to 30 mm. The load, in newtons, shall be adapted for other dimensions. If the mineral
42、glass is not damaged during the above test, then it may be assumed that the glass has been reinforced. 7 Measuring surface stress 7.1 Test device The test device is a commercially available optical device as depicted in Figure 6. BSISO143683:2003IS-86341 O3:(3002E) I SO 3002 All irhgts seredevr 7Key
43、 1 low-pressure sodium lamp 2 supporting plate 3 objective 4 interrupter 5 deflector 6 ocular Figure 6 Diagram of the optical measuring device 7.2 Test procedure Place the mineral glass under test in the centre of the supporting plate. Measure the value of the surface stress and the depth of the sur
44、face stress layer. It is assumed that the mineral glass has been reinforced if the value of the surface stress and the depth of the surface stress layer comply with the pertinent specified values according to the application. For further information, see the manufacturers instruction manual for the
45、device. BSISO143683:2003IS-86341 O3:(3002E) 8 I SO 3002 All irhgts seredevrAnnex A (informative) Method of checking the appearance A.1 Visual inspection This method consists in making a visual examination of the watch-glasses at a distance of 30 cm with the naked eye to assess the defects referred t
46、o in 3.2 to 3.10 (the test time shall be defined by agreement between the customer and the supplier). A.2 Work station The superficial defects shall be inspected in a dark work station, which prevents (by using black curtains) natural and artificial parasitic light from influencing the results. A.3
47、Equipment Use a 1 500 lx, vertical and horizontal light consisting, for example, of two horizontal and vertical light beams from a floodlight (see Figure A.1), or any other apparatus designed for the visual inspection of surfaces. A.4 Quality criteria In the case of some of the possible defects ment
48、ioned, acceptance or rejection is subjective as it depends on human factors which cannot be rigorously quantified. BSISO143683:2003IS-86341 O3:(3002E) I SO 3002 All irhgts seredevr 9Key 1 glass undergoing inspection 2 horizontal light source 3 vertical light source 4 table or bench Figure A.1 Inspec
49、tion device BSISO143683:2003BS ISO 14368-3:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision
