{"id":2939,"date":"2026-06-15T08:37:48","date_gmt":"2026-06-15T00:37:48","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=2939"},"modified":"2026-06-15T08:37:49","modified_gmt":"2026-06-15T00:37:49","slug":"how-is-the-accuracy-grade-of-granite-precision-measuring-tools-square-rulers-classified","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/06\/15\/how-is-the-accuracy-grade-of-granite-precision-measuring-tools-square-rulers-classified\/","title":{"rendered":"Comment est class\u00e9e la classe de pr\u00e9cision des instruments de mesure de pr\u00e9cision en granit \u2013 les r\u00e8gles d'\u00e9querre ?"},"content":{"rendered":"

Classification des grades de pr\u00e9cision des \u00e9querres en granit \u2013 Norme nationale chinoise : JB\/T 10027-2017 \u201c Plaques de surface, r\u00e8gles et \u00e9querres en granit \u201d, class\u00e9es en fonction de la plan\u00e9it\u00e9 de la surface de travail, de la pr\u00e9cision d\u2019\u00e9querrage et du parall\u00e9lisme, et r\u00e9parties en trois grades : 000, 00 et 0. Plus le num\u00e9ro de classe est petit, plus la pr\u00e9cision est \u00e9lev\u00e9e.<\/p>\n\n\n\n

I. Positionnement par niveau (sc\u00e9narios d'application)
Cat\u00e9gorie 000 (cat\u00e9gorie de r\u00e9f\u00e9rence)
Pr\u00e9cision maximale, r\u00e9serv\u00e9e aux salles de m\u00e9trologie et aux laboratoires \u00e0 temp\u00e9rature constante, utilis\u00e9e pour le transfert de valeurs et l'\u00e9talonnage des \u00e9talons de mesure.
Grade 00 (grade de pr\u00e9cision)
Utilisation industrielle de haute pr\u00e9cision, destin\u00e9e \u00e0 la mise en service d'\u00e9quipements de m\u00e9trologie par coordonn\u00e9es (CMM), au contr\u00f4le de machines-outils de pr\u00e9cision et au contr\u00f4le qualit\u00e9 de composants haut de gamme.
Grade 0 (qualit\u00e9 industrielle)
Contr\u00f4le r\u00e9gulier de la perpendicularit\u00e9 sur site, lors de l'utilisation des machines-outils, de l'installation des machines-outils standard, des moules et de l'outillage.<\/p>\n\n\n\n

II. Indicateurs de tol\u00e9rance de l'al\u00e9sage (Unit\u00e9 : \u03bcm, \u00e0 titre d'exemple, selon des sp\u00e9cifications courantes)
Les tol\u00e9rances s'assouplissent \u00e0 mesure que la longueur des c\u00f4t\u00e9s du carr\u00e9 augmente. Voici les limites standard pour le noyau :<\/p>\n\n\n\n

    \n
  1. Pr\u00e9cision d'\u00e9querrage (perpendicularit\u00e9 \u00e0 90\u00b0, indicateur central)
    Pour la m\u00eame sp\u00e9cification : (\\boldsymbol{Grade 000 < Grade 00 < Grade 0})
    Petits carr\u00e9s (par exemple, 200 \u00d7 200 mm) :
    Grade 000 : \u2264 1,5 \u03bcm
    Grade 00 : \u2264 2,5 \u03bcm
    Grade 0 : \u2264 4,0 \u03bcm
    Carr\u00e9s de taille moyenne (par exemple, 400 \u00d7 400 mm) :
    Grade 000 : \u2264 3,0 \u03bcm
    Grade 00 : \u2264 5,0 \u03bcm
    Grade 0 : \u2264 8,0 \u03bcm<\/li>\n\n\n\n
  2. Plan\u00e9it\u00e9 de la surface de travail
    De m\u00eame, on applique le principe selon lequel plus la classe est \u00e9lev\u00e9e, plus la tol\u00e9rance est faible, ce qui constitue la base permettant de garantir la pr\u00e9cision des mesures.
    200 \u00d7 200 mm :
    Grade 000 : \u2264 1,0 \u03bcm
    Grade 00 : \u2264 1,8 \u03bcm
    Grade 0 : \u2264 3,0 \u03bcm<\/li>\n\n\n\n
  3. Parall\u00e9lisme de deux surfaces lat\u00e9rales
    Erreur de parall\u00e9lisme des c\u00f4t\u00e9s oppos\u00e9s : la r\u00e8gle relative \u00e0 la limite est la m\u00eame que ci-dessus ; elle sert \u00e0 contr\u00f4ler la pr\u00e9cision g\u00e9om\u00e9trique globale.<\/li>\n<\/ol>\n\n\n\n

    III. Notes compl\u00e9mentaires
    Segments de dimension
    La norme divise les carr\u00e9s en segments de diff\u00e9rentes dimensions en fonction de la longueur du c\u00f4t\u00e9 ext\u00e9rieur (200, 250, 300, 400, 500, 630 mm, etc.). Plus la dimension est grande, plus la tol\u00e9rance admissible est importante.
    Analyse comparative internationale
    Cat\u00e9gorie nationale 000 \u2248 Cat\u00e9gorie internationale AA, Cat\u00e9gorie 00 \u2248 Cat\u00e9gorie A, Cat\u00e9gorie 0 \u2248 Cat\u00e9gorie B.
    Diff\u00e9renciation des usages
    La classe 000 est obligatoire pour la tra\u00e7abilit\u00e9 m\u00e9trologique ; la classe 00 est choisie pour l'usinage de pr\u00e9cision et le contr\u00f4le qualit\u00e9 en laboratoire ; la classe 0 peut \u00eatre directement utilis\u00e9e pour le contr\u00f4le de production sur site.<\/p>\n\n\n\n

    \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

    Classification des grades de pr\u00e9cision des \u00e9querres en granit \u2013 Norme nationale chinoise : JB\/T 10027-2017 \u201c Plaques de surface, r\u00e8gles et \u00e9querres en granit \u201d, class\u00e9es selon la plan\u00e9it\u00e9 de la surface de travail, la pr\u00e9cision d\u2019\u00e9querrage et le parall\u00e9lisme, et r\u00e9parties en trois grades : 000, 00 et 0. Plus le num\u00e9ro de grade est petit, plus la pr\u00e9cision est \u00e9lev\u00e9e. I. Positionnement des grades (sc\u00e9narios d\u2019application) Grade 000 (grade de r\u00e9f\u00e9rence) Pr\u00e9cision maximale, limit\u00e9 \u00e0\u2026<\/p>","protected":false},"author":1,"featured_media":1294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-2939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/01\/\u65b9\u5c3a4.jpg",400,300,false],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/fr\/author\/jtlcnc\/"},"comment_info":0,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":425,"filter":"raw","cat_ID":35,"category_count":425,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2939","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/comments?post=2939"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2939\/revisions"}],"predecessor-version":[{"id":2940,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/2939\/revisions\/2940"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=2939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=2939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=2939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}