{"id":265235,"date":"2024-10-19T17:41:30","date_gmt":"2024-10-19T17:41:30","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-198432018\/"},"modified":"2024-10-25T13:37:50","modified_gmt":"2024-10-25T13:37:50","slug":"bs-iso-198432018","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-198432018\/","title":{"rendered":"BS ISO 19843:2018"},"content":{"rendered":"

This document specifies a method for the determination of the strength of finished ceramic balls for ball bearings, preferably made of silicon nitride (Si3<\/sub>N4<\/sub>), with ball diameters from 3 mm to 50 mm.<\/p>\n

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NOTE 1 ISO 26602 specifies the requirements for preprocessed silicon nitride materials for rolling bearing balls. ISO 3290\u20112 specifies requirements for finished silicon nitride balls for rolling bearings.<\/p>\n<\/blockquote>\n

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NOTE 2 Other test methods to determine ceramic ball strength can be found in Reference [7].<\/p>\n<\/blockquote>\n

The results of the strength tests slightly depend on the Poisson’s ratio. For this reason, all calculations are restricted to a Poisson’s ratio ranging from 0,15 to 0,35. This includes the Poisson’s ratio of a typical silicon nitride ceramic used as rolling element in ball bearings.<\/p>\n

The method can also be used for rolling bearing balls made of other ceramic materials, but the reported prefactors may not be valid.<\/p>\n

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NOTE 3 Poisson\u2019s ratio of isotropic materials can be determined by one of the methods given in ISO 17561.<\/p>\n<\/blockquote>\n

Because of the (defect controlled) brittle fracture behaviour of ceramic materials, a significant scatter of individual results in the characterization of a series of nominally identical samples can occur.<\/p>\n

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NOTE 4 A further statistical analysis according to ISO 20501 can be carried out.<\/p>\n<\/blockquote>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nNational foreword <\/td>\n<\/tr>\n
6<\/td>\nForeword <\/td>\n<\/tr>\n
7<\/td>\nIntroduction <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n
14<\/td>\n4 Symbols <\/td>\n<\/tr>\n
15<\/td>\n5 Test description
6 Equipment and testing devices
6.1 Loading device <\/td>\n<\/tr>\n
16<\/td>\n6.2 Testing machine
6.3 Measuring devices
6.3.1 General
6.3.2 Micrometer for external measurement
6.3.3 Mechanical dial gauge
6.3.4 Light microscope
6.3.5 Measuring gauge for the determination of the ligament thickness <\/td>\n<\/tr>\n
17<\/td>\n6.4 Grinding machine
6.5 Psychrometer
6.6 Dryer
7 Preparation of the notched ball
7.1 Number of test pieces n
7.2 Diameter determination <\/td>\n<\/tr>\n
18<\/td>\n7.3 Preparation of the notch
7.3.1 General
7.3.2 Notch geometry <\/td>\n<\/tr>\n
19<\/td>\n7.4 Cleaning
8 Test procedure
8.1 Measurement of notch parameters <\/td>\n<\/tr>\n
21<\/td>\n8.2 Mechanical testing <\/td>\n<\/tr>\n
23<\/td>\n9 Evaluation
10 Potential uncertainties and deviations
11 Test report <\/td>\n<\/tr>\n
25<\/td>\nAnnex A (normative) Function tables for prefactor f <\/td>\n<\/tr>\n
28<\/td>\nAnnex B (normative) Comparability of notched ball strength results <\/td>\n<\/tr>\n
32<\/td>\nAnnex C (informative) V-block system for preparation of the notch <\/td>\n<\/tr>\n
33<\/td>\nAnnex D (informative) Positioning aid <\/td>\n<\/tr>\n
34<\/td>\nAnnex E (informative) Example of a test report for determination of the notched ball strength <\/td>\n<\/tr>\n
36<\/td>\nAnnex F (normative) Notch root damage due to machining <\/td>\n<\/tr>\n
38<\/td>\nAnnex G (informative) Proposed initial testing speed for the cross head <\/td>\n<\/tr>\n
39<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Rolling bearings. Ceramic bearing balls. Determination of strength by notched ball test<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2018<\/td>\n40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":265242,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[316,2641],"product_tag":[],"class_list":{"0":"post-265235","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-21-100-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/265235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/265242"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=265235"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=265235"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=265235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}