{"id":21309,"date":"2025-07-03T07:27:14","date_gmt":"2025-07-03T07:27:14","guid":{"rendered":"https:\/\/bfymold.com\/?p=21309"},"modified":"2025-07-08T07:58:52","modified_gmt":"2025-07-08T07:58:52","slug":"spi-surface-finish-standards-for-injection-molds","status":"publish","type":"post","link":"https:\/\/bfymold.com\/fr\/spi-surface-finish-standards-for-injection-molds\/","title":{"rendered":"Ma\u00eetriser les normes d’\u00e9tat de surface SPI pour les moules d’injection"},"content":{"rendered":"\n

Les classes d’\u00e9tat de surface SPI d\u00e9mystifi\u00e9es<\/h2>\n\n

Les normes SPI classent les finitions des moules<\/a> en quatre cat\u00e9gories, avec des valeurs de rugosit\u00e9 (Ra) et des m\u00e9thodes de traitement pr\u00e9cises :<\/p>\n\n

<\/div>\n\n
\"SPI
SPI Finition de la surface<\/figcaption><\/figure>\n\n
<\/div>\n\n

SPI Classe A : Polissage au diamant (clart\u00e9 optique)<\/h3>\n\n
Grade<\/td>Ra (\u00b5m)<\/td>M\u00e9thode<\/td>Applications<\/td><\/tr>
A-1<\/td>0.012-0.025<\/td>#3, p\u00e2te diamant\u00e9e \u00e0 6000 grains<\/td>Lentilles m\u00e9dicales, guides de lumi\u00e8re<\/td><\/tr>
A-2<\/td>0.025-0.05<\/td>#6, p\u00e2te diamant\u00e9e de grain 3000<\/td>Couvercles transparents, r\u00e9flecteurs<\/td><\/tr>
A-3<\/td>0.05-0.10<\/td>#15, p\u00e2te diamant\u00e9e \u00e0 1200 grains<\/td>Composants de l’\u00e9cran<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

SPI Classe B : Polissage au papier de verre (semi-brillant)<\/h3>\n\n
Grade<\/td>Ra (\u00b5m)<\/td>M\u00e9thode<\/td>Applications<\/td><\/tr>
B-1<\/td>0.05-0.10<\/td>Papier de verre \u00e0 600 grains<\/td>Electronique grand public<\/td><\/tr>
B-2<\/td>0.10-0.15<\/td>Papier de verre 400<\/td>Emballage cosm\u00e9tique<\/td><\/tr>
B-3<\/td>0.28-0.32<\/td>Papier de verre \u00e0 grain 320<\/td>Bo\u00eetiers industriels<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

SPI Classe C : Polissage de la pierre (finition mate)<\/h3>\n\n
Grade<\/td>Ra (\u00b5m)<\/td>M\u00e9thode<\/td>Applications<\/td><\/tr>
C-1<\/td>0.35-0.40<\/td>Pierre de 600 grains<\/td>Int\u00e9rieurs d’automobiles<\/td><\/tr>
C-2<\/td>0.45-0.55<\/td>Pierre de 400 grains<\/td>Poign\u00e9es d’outils<\/td><\/tr>
C-3<\/td>0.63-0.70<\/td>Pierre de 320<\/td>Masquer les traces d’\u00e9vier<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

SPI Classe D : Sablage (surfaces textur\u00e9es)<\/h3>\n\n
Grade<\/td>Ra (\u00b5m)<\/td>M\u00e9thode<\/td>Applications<\/td><\/tr>
D-1<\/td>0.80-1.00<\/td>#11 perles de verre<\/td>Surfaces r\u00e9sistantes aux rayures<\/td><\/tr>
D-2<\/td>1.00-2.80<\/td>Oxyde d’aluminium #240<\/td>Outils antid\u00e9rapants<\/td><\/tr>
D-3<\/td>3.20-18<\/td>Oxyde d’aluminium #24<\/td>Mat\u00e9riel lourd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

Comparaison entre SPI et VDI 3400<\/h2>\n\n
Param\u00e8tres<\/td>Standard SPI<\/td>VDI 3400 \u00c9quivalent<\/td><\/tr>
Finition optique<\/td>A-1 (0.012\u00b5m)<\/td>VDI 0 (0.025\u00b5m)<\/td><\/tr>
Semi-brillant<\/td>B-1 (0.05\u00b5m)<\/td>VDI 12 (0.15\u00b5m)<\/td><\/tr>
Texture mate<\/td>C-2 (0.50\u00b5m)<\/td>VDI 25 (1.0\u00b5m)<\/td><\/tr>
Texture grossi\u00e8re<\/td>D-3 (12.5\u00b5m)<\/td>VDI 40 (18\u00b5m)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n
\"finition
Finition de surface SPI ( Source de l’image : Protolabs )<\/figcaption><\/figure>\n\n
<\/div>\n\n

Applications sp\u00e9cifiques \u00e0 l’industrie<\/h2>\n\n
<\/div>\n\n

Dispositifs m\u00e9dicaux<\/h3>\n\n
Exigence<\/td>Solution SPI<\/td>B\u00e9n\u00e9fice<\/td><\/tr>
R\u00e9sistance bact\u00e9rienne<\/td>A-1 (Ra 0.025\u00b5m)<\/td>100% de r\u00e9ussite au test d’essuyage de la FDA<\/td><\/tr>
Surfaces autoclavables<\/td>B-1 + passivation<\/td>Plus de 500 cycles de st\u00e9rilisation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

\u00c9lectronique grand public<\/h3>\n\n
Exigence<\/td>Solution SPI<\/td>B\u00e9n\u00e9fice<\/td><\/tr>
Zones sans rayures<\/td>A-3 + rev\u00eatement dur<\/td>Duret\u00e9 du crayon 5H<\/td><\/tr>
R\u00e9sistance aux empreintes digitales<\/td>Texture D-1<\/td>70% de bavures en moins<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
<\/div>\n\n

Le processus de pr\u00e9cision de BFY Mold<\/h2>\n\n
    \n
  1. Balayage laser : D\u00e9tection des \u00e9carts >0,005 mm<\/li>\n\n\n\n
  2. Polissage robotis\u00e9 : coh\u00e9rence de Ra de \u00b10,01\u00b5m<\/li>\n\n\n\n
  3. Validation 3D : Cartographie de la surface d’une pi\u00e8ce<\/li>\n\n\n\n
  4. Entretien \u00e9lectrochimique : Restauration des textures us\u00e9es<\/li>\n<\/ol>\n\n
    <\/div>\n\n

    8 FAQ essentielles sur l’\u00e9tat de surface SPI<\/h2>\n\n
      \n
    1. Quel est le grade SPI qui dissimule le mieux les marques d’enfoncement ?SPI C-2 (Ra 0,45-0,55\u00b5m) masque les marques d’enfoncement dans les polym\u00e8res remplis de verre.<\/li>\n<\/ol>\n\n
        \n
      1. Comment SPI A-2 r\u00e9duit-il les rejets de pi\u00e8ces ?R\u00e9duit les lignes d’\u00e9coulement de 60 % par rapport aux moules non polis.<\/li>\n<\/ol>\n\n
          \n
        1. Quel est le d\u00e9lai de mise en \u0153uvre de la texturation SPI D-2 ?7-10 jours pour les moules standards chez BFY Mold.<\/li>\n<\/ol>\n\n
            \n
          1. Les finitions SPI peuvent-elles r\u00e9sister au nylon charg\u00e9 de verre ?Utiliser au minimum SPI B-2 ; \u00e9viter la classe A pour les mat\u00e9riaux abrasifs.<\/li>\n<\/ol>\n\n
              \n
            1. Comment sp\u00e9cifier SPI sur les dessins de moules ?Annoter : \u00ab FINISH : SPI B-1 PER SPI STD-123 \u00bb.<\/li>\n<\/ol>\n\n
                \n
              1. SPI D-3 am\u00e9liore-t-il l’adh\u00e9rence de la peinture ?Oui : 5 fois plus d’adh\u00e9rence par rapport aux surfaces polies (ASTM D4541).<\/li>\n<\/ol>\n\n
                  \n
                1. Diff\u00e9rence de co\u00fbt entre SPI A-1 et B-1 ?A-1 ajoute 25 \u00e0 40 % en raison du polissage manuel.<\/li>\n<\/ol>\n\n
                    \n
                  1. Restauration des finitions SPI us\u00e9es ?La texturation \u00e9lectrochimique permet de r\u00e9cup\u00e9rer 95 % du Ra d’origine.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                    Les classes d’\u00e9tat de surface SPI d\u00e9mystifi\u00e9es Les normes SPI classent les finitions des moules en quatre cat\u00e9gories, avec des valeurs de rugosit\u00e9 (Ra) et des m\u00e9thodes de traitement pr\u00e9cises : SPI Classe A : Polissage au diamant (clart\u00e9 optique) Grade Ra (\u00b5m) M\u00e9thode Applications A-1 0.012-0.025 #3, p\u00e2te diamant\u00e9e \u00e0 6000 grains Lentilles m\u00e9dicales, […]<\/p>\n","protected":false},"author":1,"featured_media":21253,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[49],"tags":[],"class_list":["post-21309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/posts\/21309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/comments?post=21309"}],"version-history":[{"count":0,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/posts\/21309\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/media\/21253"}],"wp:attachment":[{"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/media?parent=21309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/categories?post=21309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bfymold.com\/fr\/wp-json\/wp\/v2\/tags?post=21309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}