{"id":13799,"date":"2026-09-02T21:58:50","date_gmt":"2026-09-02T19:58:50","guid":{"rendered":"https:\/\/ingritech.pl\/?p=13799"},"modified":"2026-10-21T20:57:16","modified_gmt":"2026-10-21T18:57:16","slug":"gh25-a-gp25-rozdil-michani-ocelove-drti","status":"publish","type":"post","link":"https:\/\/ingritech.pl\/cs\/gh25-a-gp25-rozdil-michani-ocelove-drti\/","title":{"rendered":"GH25 a GP25: rozd\u00edl a lze je m\u00edchat?"},"content":{"rendered":"<h1>GH25 a GP25: jak\u00fd je rozd\u00edl a lze tyto druhy ocelov\u00e9 drti m\u00edchat<\/h1>\n<p>GH25 a GP25 jsou dva nejpou\u017e\u00edvan\u011bj\u0161\u00ed druhy vysokouhl\u00edkov\u00e9 ocelov\u00e9 drti (ocelov\u00e9ho gritu) pro trysk\u00e1n\u00ed kovov\u00fdch povrch\u016f. Oba materi\u00e1ly maj\u00ed stejnou zrnitost G25 a t\u00e9m\u011b\u0159 shodn\u00e9 chemick\u00e9 slo\u017een\u00ed, proto se z\u00e1kazn\u00edci \u010dasto ptaj\u00ed, zda je lze nasypat do jednoho z\u00e1sobn\u00edku a zda je mezi nimi v\u016fbec podstatn\u00fd rozd\u00edl. V tomto \u010dl\u00e1nku t\u00fdm Ingritech porovn\u00e1v\u00e1 GH25 a GP25 z hlediska tvrdosti, tvaru zrna a pou\u017eit\u00ed, vysv\u011btluje, co k m\u00edch\u00e1n\u00ed abraziv uv\u00e1d\u011bj\u00ed normy ISO a SAE, a nab\u00edz\u00ed praktick\u00e1 doporu\u010den\u00ed pro firmy, kter\u00e9 vyb\u00edraj\u00ed tryskac\u00ed prost\u0159edek pro sv\u00e1 za\u0159\u00edzen\u00ed.<\/p>\n<h2>Co jsou GH25 a GP25<\/h2>\n<p>GH25 a GP25 jsou druhy vysokouhl\u00edkov\u00e9 lit\u00e9 ocelov\u00e9 drti (ostrohrann\u00e9ho gritu), kter\u00e1 vznik\u00e1 drcen\u00edm lit\u00fdch ocelov\u00fdch brok\u016f. Chemick\u00e9 slo\u017een\u00ed obou materi\u00e1l\u016f je prakticky toto\u017en\u00e9: uhl\u00edk cca 0,80\u20131,20 %, mangan 0,60\u20131,20 %, k\u0159em\u00edk od 0,40 %, s\u00edra a fosfor max. 0,05 % ka\u017ed\u00fd. Hustota obou druh\u016f \u010din\u00ed p\u0159ibli\u017en\u011b 7,3\u20137,6 g\/cm\u00b3, sypn\u00e1 hmotnost p\u0159ibli\u017en\u011b 4,2 g\/cm\u00b3. Jde o lit\u00e9 vysokouhl\u00edkov\u00e9 abrazivum s martenzitickou strukturou a jemn\u00fdmi karbidy, kter\u00e1 chr\u00e1n\u00ed zrna p\u0159ed p\u0159ed\u010dasn\u00fdm rozpadem.<\/p>\n<p>Hlavn\u00ed rozd\u00edl mezi GH25 a GP25 spo\u010d\u00edv\u00e1 v tvrdosti a v tom, jak se zrno chov\u00e1 b\u011bhem provozu:<\/p>\n<ul>\n<li><strong>GH25 (Hard)<\/strong> \u2013 nejvy\u0161\u0161\u00ed tvrdost, p\u0159ibli\u017en\u011b 60\u201366 HRC (\u2248 620\u2013720 HV). Zrno je ostrohrann\u00e9 a \u2013 co\u017e je podstatn\u00e9 \u2013 z\u016fst\u00e1v\u00e1 ostr\u00e9 po celou dobu \u017eivotnosti. Tento grit je ur\u010den pro n\u00e1ro\u010dn\u00e9 pr\u00e1ce: hloubkov\u00e9 \u010di\u0161t\u011bn\u00ed, odstra\u0148ov\u00e1n\u00ed siln\u00fdch okuj\u00ed a vytvo\u0159en\u00ed hrub\u00e9ho profilu povrchu, nap\u0159. v metac\u00edch (turb\u00ednov\u00fdch) tryska\u010d\u00edch.<\/li>\n<li><strong>GP25 (Soft)<\/strong> \u2013 m\u011bk\u010d\u00ed druh, p\u0159ibli\u017en\u011b 42\u201351 HRC (\u2248 470\u2013550 HV). Na za\u010d\u00e1tku je zrno rovn\u011b\u017e ostrohrann\u00e9, b\u011bhem provozu se v\u0161ak rychle zaobluje. GP25 se osv\u011bd\u010duje p\u0159i b\u011b\u017en\u00e9m \u010di\u0161t\u011bn\u00ed povrchu: odstran\u011bn\u00ed rzi, okuj\u00ed a st\u0159edn\u011b hrub\u00e9m profilov\u00e1n\u00ed bez nadm\u011brn\u00e9ho po\u0161kozen\u00ed z\u00e1kladn\u00edho materi\u00e1lu.<\/li>\n<\/ul>\n<h2>Srovn\u00e1vac\u00ed tabulka GH25 a GP25<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; font-family: Arial, sans-serif; margin-top: 20px;\">\n<thead>\n<tr style=\"background-color: #374151; color: #ffffff;\">\n<th style=\"padding: 10px; border: 1px solid #e5e7eb;\">Parametr<\/th>\n<th style=\"padding: 10px; border: 1px solid #e5e7eb;\">GH25<\/th>\n<th style=\"padding: 10px; border: 1px solid #e5e7eb;\">GP25<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #f9fafb;\">\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Typ materi\u00e1lu<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Vysokouhl\u00edkov\u00e1 lit\u00e1 ocelov\u00e1 dr\u0165<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Vysokouhl\u00edkov\u00e1 lit\u00e1 ocelov\u00e1 dr\u0165<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Chemick\u00e9 slo\u017een\u00ed<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">C 0,80\u20131,20 %, Mn 0,60\u20131,20 %, Si \u2265 0,40 %, S, P \u2264 0,05 %<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">C 0,80\u20131,20 %, Mn 0,60\u20131,20 %, Si \u2265 0,40 %, S, P \u2264 0,05 %<\/td>\n<\/tr>\n<tr style=\"background: #f9fafb;\">\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Tvrdost<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 60\u201366 HRC (620\u2013720 HV)<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 42\u201351 HRC (470\u2013550 HV)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Hustota<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 7,3\u20137,6 g\/cm\u00b3<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 7,3\u20137,6 g\/cm\u00b3<\/td>\n<\/tr>\n<tr style=\"background: #f9fafb;\">\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Tvar zrna<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Ostrohrann\u00e9; z\u016fst\u00e1v\u00e1 ostr\u00e9 b\u011bhem provozu<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Zpo\u010d\u00e1tku ostrohrann\u00e9, rychle se zaobluje<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Zrnitost<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">G25 (\u2248 0,8\u20131,2 mm)<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">G25 (\u2248 0,8\u20131,2 mm), stejn\u00e1 frakce<\/td>\n<\/tr>\n<tr style=\"background: #f9fafb;\">\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Sypn\u00e1 hmotnost<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 4,2 g\/cm\u00b3<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">\u2248 4,2 g\/cm\u00b3<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">K\u0159ehkost<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Vysok\u00e1 tvrdost \u2192 k\u0159eh\u010d\u00ed p\u0159i n\u00e1razu<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Ni\u017e\u0161\u00ed tvrdost \u2192 vy\u0161\u0161\u00ed hou\u017eevnatost<\/td>\n<\/tr>\n<tr style=\"background: #f9fafb;\">\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">Pou\u017eit\u00ed<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">N\u00e1ro\u010dn\u00e9 pr\u00e1ce: hloubkov\u00e9 \u010di\u0161t\u011bn\u00ed, hrub\u00fd profil, metac\u00ed (turb\u00ednov\u00e9) tryska\u010de<\/td>\n<td style=\"padding: 10px; border: 1px solid #e5e7eb;\">B\u011b\u017en\u00e9 \u010di\u0161t\u011bn\u00ed: odstran\u011bn\u00ed rzi a okuj\u00ed, st\u0159edn\u011b hrub\u00fd profil<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Kter\u00e9 normy upravuj\u00ed ocelovou dr\u0165<\/h2>\n<p>Velikost, tvrdost a p\u0159\u00edpustn\u00e9 ne\u010distoty tryskac\u00edch abraziv stanov\u00ed n\u011bkolik mezin\u00e1rodn\u00edch norem. \u017d\u00e1dn\u00e1 z nich v\u0161ak v\u00fdslovn\u011b nezakazuje ani neupravuje m\u00edch\u00e1n\u00ed r\u016fzn\u00fdch druh\u016f v jednom z\u00e1sobn\u00edku:<\/p>\n<ul>\n<li><strong>ISO 11124-3:2018<\/strong> \u2013 mezin\u00e1rodn\u00ed norma pro vysokouhl\u00edkov\u00e9 lit\u00e9 ocelov\u00e9 broky a dr\u0165. Definuje ozna\u010den\u00ed abraziva (nap\u0159. M\/HCS\/G025\/\u2026HV), po\u017eadavky na velikost a tvrdost podle Vickerse a pojem \u201eciz\u00ed ne\u010distoty&#8221;, tj. nemagnetick\u00e9 \u010d\u00e1stice. Proto\u017ee GH25 i GP25 jsou \u017eelezn\u00e9 (magnetick\u00e9) materi\u00e1ly, nespadaj\u00ed pod omezen\u00ed t\u00fdkaj\u00edc\u00ed se \u201eciz\u00edho materi\u00e1lu&#8221; \u2013 to se vztahuje nap\u0159. na p\u00edsek nebo strusku.<\/li>\n<li><strong>SAE J1993<\/strong> \u2013 americk\u00e1 specifikace \u201eHigh-Carbon Cast-Steel Grit&#8221;, kter\u00e1 podrobn\u011b stanov\u00ed chemick\u00e9 slo\u017een\u00ed a rozsahy tvrdosti jednotliv\u00fdch t\u0159\u00edd: GP (m\u011bkk\u00e1), GL (st\u0159edn\u00ed) a GH (tvrd\u00e1, od cca 60 HRC). Norma nevy\u017eaduje skladovat GH a GP odd\u011blen\u011b, ale p\u0159\u00edsn\u011b upravuje tvrdost a \u010distotu abraziva.<\/li>\n<li><strong>SAE J444<\/strong> \u2013 norma zrnitosti (granulometrie) tryskac\u00edch abraziv; pr\u00e1v\u011b podle n\u00ed odpov\u00edd\u00e1 frakce G25 jmenovit\u00e9 velikosti zrna p\u0159ibli\u017en\u011b 0,8\u20131,2 mm.<\/li>\n<li><strong>ISO 11125 (\u0159ada)<\/strong> \u2013 zku\u0161ebn\u00ed metody pro kovov\u00e1 abraziva: odb\u011br vzork\u016f (ISO 11125-1), distribuce velikosti \u010d\u00e1stic (ISO 11125-2), tvrdost (ISO 11125-3) atd.<\/li>\n<\/ul>\n<p>V\u0161echny uveden\u00e9 normy popisuj\u00ed vlastnosti jednoho, samostatn\u00e9ho abraziva. Konkr\u00e9tn\u00ed pokyny pro m\u00edch\u00e1n\u00ed GH25 s GP25 neobsahuje ani ISO, ani SAE. V\u0161echny zdroje se v\u0161ak shoduj\u00ed v jednom: abrazivo je nutn\u00e9 skladovat v suchu, proto\u017ee vlhkost zp\u016fsobuje korozi zrn a tvorbu prachu, co\u017e zhor\u0161uje bezpe\u010dnost i kvalitu trysk\u00e1n\u00ed.<\/p>\n<h2>Lze GH25 a GP25 m\u00edchat v jednom z\u00e1sobn\u00edku<\/h2>\n<p>Form\u00e1ln\u011b je m\u00edch\u00e1n\u00ed GH25 a GP25 mo\u017en\u00e9: oba materi\u00e1ly jsou magnetick\u00e9 a spl\u0148uj\u00ed po\u017eadavky ISO 11124-3 i SAE J1993 pro vysokouhl\u00edkov\u00e1 abraziva. Technicky v\u0161ak takov\u00e9 \u0159e\u0161en\u00ed p\u0159in\u00e1\u0161\u00ed \u0159adu rizik a <strong>bez p\u0159edchoz\u00edch d\u016fkladn\u00fdch zkou\u0161ek se m\u00edch\u00e1n\u00ed nedoporu\u010duje<\/strong>. Hlavn\u00ed technick\u00e1 rizika:<\/p>\n<ul>\n<li><strong>Ucp\u00e1v\u00e1n\u00ed z\u00e1sobn\u00edku a podava\u010de.<\/strong> Ostr\u00e1, hranat\u00e1 zrna GH25 v kombinaci s oblej\u0161\u00edm GP25 mohou v z\u00e1sobn\u00edku nebo ve v\u00fdpusti vytv\u00e1\u0159et kl\u00ednov\u00e9 z\u00e1tky (\u201eklenby&#8221;), zejm\u00e9na p\u0159i vibrac\u00edch nebo zv\u00fd\u0161en\u00e9 vlhkosti.<\/li>\n<li><strong>Segregace sm\u011bsi (tzv. efekt para o\u0159ech\u016f).<\/strong> P\u0159i ot\u0159esech se ostrohrann\u00e1 zrna GH25 mohou v z\u00e1sobn\u00edku rozd\u011blovat jinak ne\u017e zaoblen\u011bj\u0161\u00ed GP25. Vznikaj\u00ed tak z\u00f3ny s nerovnom\u011brnou koncentrac\u00ed obou druh\u016f, co\u017e naru\u0161uje stabilitu procesu.<\/li>\n<li><strong>Zm\u011bna charakteru a intenzity dopadu.<\/strong> GH25 si zachov\u00e1v\u00e1 ostr\u00e9 hrany a p\u016fsob\u00ed na povrch agresivn\u011bji; GP25 dopad \u201etlum\u00ed&#8221; m\u00edrn\u011bji. Ve sm\u011bsi jsou dopady nehomogenn\u00ed \u2013 z\u010d\u00e1sti tvrd\u00e9, z\u010d\u00e1sti m\u011bkk\u00e9 \u2013 a v\u00fdsledek trysk\u00e1n\u00ed je h\u016f\u0159e opakovateln\u00fd.<\/li>\n<li><strong>Rychlej\u0161\u00ed a nerovnom\u011brn\u00e9 opot\u0159eben\u00ed trysek a za\u0159\u00edzen\u00ed.<\/strong> Tvrd\u0161\u00ed \u010d\u00e1stice GH25 v\u00edce opot\u0159ebov\u00e1vaj\u00ed trysky, metac\u00ed kola a potrub\u00ed; prom\u011bnliv\u00e9 slo\u017een\u00ed sm\u011bsi \u010din\u00ed progn\u00f3zu opot\u0159eben\u00ed nespolehlivou.<\/li>\n<li><strong>V\u00edce prachu.<\/strong> Sm\u011bs s rozd\u00edlnou mikrostrukturou (k\u0159eh\u010d\u00ed GH25 + drobn\u00e9 \u00falomky m\u011bk\u010d\u00edho GP25) m\u016f\u017ee vytv\u00e1\u0159et v\u00edce jemn\u00e9ho prachu ne\u017e \u010dist\u00e9 abrazivo. To vy\u017eaduje d\u016fsledn\u011bj\u0161\u00ed kontrolu ods\u00e1v\u00e1n\u00ed a osobn\u00edch ochrann\u00fdch prost\u0159edk\u016f obsluhy.<\/li>\n<li><strong>Koroze.<\/strong> Riziko chemick\u00e9 reakce mezi dv\u011bma ocelov\u00fdmi abrazivy je minim\u00e1ln\u00ed, ale sm\u011bs mus\u00ed \u2013 jako ka\u017ed\u00e1 ocelov\u00e1 dr\u0165 \u2013 z\u016fstat such\u00e1. Vlhkost a kysel\u00e9 \u010di z\u00e1sadit\u00e9 ne\u010distoty urychluj\u00ed korozi zrn i za\u0159\u00edzen\u00ed.<\/li>\n<\/ul>\n<h2>Jak m\u00edch\u00e1n\u00ed ovliv\u0148uje kvalitu trysk\u00e1n\u00ed<\/h2>\n<p>Slo\u017een\u00ed abraziva p\u0159\u00edmo ur\u010duje rychlost \u00fab\u011bru materi\u00e1lu (MRR) a kvalitu povrchu:<\/p>\n<ul>\n<li><strong>Rychlost \u00fab\u011bru materi\u00e1lu.<\/strong> GH25 d\u00edky tvrdosti a ostr\u00fdm hran\u00e1m \u00fa\u010dinn\u011b odstra\u0148uje okuje a zaji\u0161\u0165uje vysok\u00fd v\u00fdkon. GP25 je m\u011bk\u010d\u00ed a jeho \u00fa\u010dinnost postupn\u011b kles\u00e1 se zaoblov\u00e1n\u00edm zrn. Ve sm\u011bsi je v\u00fdkon n\u011bkde mezi nimi a z\u00e1vis\u00ed na skute\u010dn\u00e9m pod\u00edlu GH25 \u2013 pro stabiln\u00ed v\u00fdkon proto mus\u00ed b\u00fdt pod\u00edl GH ve sm\u011bsi p\u0159\u00edsn\u011b konstantn\u00ed.<\/li>\n<li><strong>Drsnost povrchu.<\/strong> \u010c\u00edm v\u00edce GH25 ve sm\u011bsi, t\u00edm hlub\u0161\u00ed a v\u00fdrazn\u011bj\u0161\u00ed profil povrchu (v\u00fdhodn\u00e9 pro p\u0159ilnavost n\u00e1t\u011br\u016f). P\u0159evaha GP25 d\u00e1v\u00e1 hlad\u0161\u00ed, m\u00e9n\u011b drsn\u00fd povrch. Kol\u00eds\u00e1n\u00ed pom\u011bru mezi d\u00e1vkami abraziva vede k nestabiln\u00ed drsnosti.<\/li>\n<li><strong>Rovnom\u011brnost \u010di\u0161t\u011bn\u00ed.<\/strong> M\u00edsta otryskan\u00e1 p\u0159ev\u00e1\u017en\u011b GH25 budou \u010dist\u0161\u00ed a drsn\u011bj\u0161\u00ed ne\u017e m\u00edsta, kde p\u0159evl\u00e1dal GP25 \u2013 to sni\u017euje opakovatelnost v r\u00e1mci jednoho d\u00edlu i cel\u00e9 d\u00e1vky.<\/li>\n<li><strong>Opakovatelnost procesu.<\/strong> I mal\u00e9 zm\u011bny pom\u011bru GH25\/GP25 m\u011bn\u00ed v\u00fdsledn\u00e9 parametry trysk\u00e1n\u00ed. Pokud je technologick\u00fd postup nastaven na \u010dist\u00fd GH25 a do z\u00e1sobn\u00edku se dostane GP25, v\u00fdsledky zkou\u0161ek nemus\u00ed odpov\u00eddat specifikaci.<\/li>\n<\/ul>\n<h2>Pokud chcete sm\u011bs p\u0159esto vyzkou\u0161et: protokol kontroly kvality<\/h2>\n<p>Pokud firma pl\u00e1nuje otestovat sm\u011bs GH25 + GP25 (nap\u0159. v hmotnostn\u00edm pom\u011bru 50 : 50), doporu\u010dujeme prov\u00e9st s\u00e9rii zkou\u0161ek podle n\u00e1sleduj\u00edc\u00edho postupu:<\/p>\n<ol>\n<li><strong>P\u0159\u00edprava abraziva<\/strong> \u2013 nasypat sm\u011bs v ur\u010den\u00e9m pom\u011bru a d\u016fkladn\u011b ji prom\u00edchat do homogenn\u00edho stavu; kontrolovat p\u0159esnost d\u00e1vkov\u00e1n\u00ed (\u00b1 2 %) a nep\u0159\u00edtomnost vlhkosti.<\/li>\n<li><strong>Nastaven\u00ed za\u0159\u00edzen\u00ed<\/strong> \u2013 stanovit pracovn\u00ed tlak vzduchu (nap\u0159. 0,5\u20130,7 MPa), vzd\u00e1lenost od povrchu (\u2248 300 mm), \u00fahel a re\u017eim pod\u00e1v\u00e1n\u00ed podle obvykl\u00e9ho nastaven\u00ed pro dan\u00fd materi\u00e1l.<\/li>\n<li><strong>Otrysk\u00e1n\u00ed zku\u0161ebn\u00edho vzorku<\/strong> \u2013 otryskat standardn\u00ed ocelov\u00fd vzorek s rovnom\u011brnou vrstvou rzi nebo okuj\u00ed po stanovenou dobu; krit\u00e9rium: \u00fapln\u00e9 pokryt\u00ed povrchu bez \u201evynechan\u00fdch&#8221; m\u00edst.<\/li>\n<li><strong>M\u011b\u0159en\u00ed \u00fab\u011bru materi\u00e1lu<\/strong> \u2013 zv\u00e1\u017eit vzorek p\u0159ed trysk\u00e1n\u00edm a po n\u011bm a vypo\u010d\u00edtat MRR (g\/min); v\u00fdsledek mus\u00ed b\u00fdt v p\u0159ijateln\u00fdch mez\u00edch v\u016f\u010di referenci s \u010dist\u00fdm GH25.<\/li>\n<li><strong>Hodnocen\u00ed drsnosti<\/strong> \u2013 zm\u011b\u0159it Ra profilometrem v n\u011bkolika bodech; odchylka od c\u00edlov\u00e9 hodnoty max. \u00b1 10 %.<\/li>\n<li><strong>Anal\u00fdza rovnom\u011brnosti pod\u00e1v\u00e1n\u00ed<\/strong> \u2013 odebrat vzorky abraziva ze z\u00e1sobn\u00edku a ze sb\u011brn\u00e9 n\u00e1doby po provozu a ov\u011b\u0159it (nap\u0159. tvrdostn\u00ed zkou\u0161kou nebo rozborem zrn), \u017ee se pod\u00edl GH25 nezm\u011bnil o v\u00edce ne\u017e 5 % oproti v\u00fdchoz\u00edmu slo\u017een\u00ed.<\/li>\n<li><strong>Hodnocen\u00ed opot\u0159eben\u00ed za\u0159\u00edzen\u00ed<\/strong> \u2013 porovnat stav trysky a vnit\u0159n\u00edch d\u00edl\u016f p\u0159ed zkou\u0161kou a po n\u00ed; krit\u00e9rium: opot\u0159eben\u00ed v provozn\u00ed norm\u011b, bez neobvykl\u00fdch \u00fabytk\u016f.<\/li>\n<li><strong>Dokumentace<\/strong> \u2013 zaznamenat do protokolu v\u0161echny parametry, slo\u017een\u00ed sm\u011bsi, nastaven\u00ed a v\u00fdsledky; pro ka\u017edou konfiguraci abraziva prov\u00e9st nejm\u00e9n\u011b dv\u011b opakov\u00e1n\u00ed.<\/li>\n<\/ol>\n<p>Pokud se v\u00fdsledky MRR, drsnosti nebo homogenity sm\u011bsi v\u00fdrazn\u011b odchyluj\u00ed od po\u017eadavk\u016f, je sm\u011bs pro s\u00e9riov\u00e9 pou\u017eit\u00ed nevhodn\u00e1.<\/p>\n<h2>Alternativy k m\u00edch\u00e1n\u00ed GH25 a GP25<\/h2>\n<p>Pokud zkou\u0161ky uk\u00e1\u017eou, \u017ee m\u00edch\u00e1n\u00ed zhor\u0161uje stabilitu procesu, je rozumn\u011bj\u0161\u00ed zvolit jedno z n\u00e1sleduj\u00edc\u00edch \u0159e\u0161en\u00ed:<\/p>\n<ul>\n<li><strong>Odd\u011blen\u00e9 z\u00e1sobn\u00edky.<\/strong> Pou\u017e\u00edvat GH25 a GP25 v r\u016fzn\u00fdch z\u00e1sobn\u00edc\u00edch nebo pod\u00e1vac\u00edch v\u011btv\u00edch a abrazivo p\u0159ep\u00ednat podle \u00fakolu \u2013 hrub\u00e9 \u010di\u0161t\u011bn\u00ed, nebo dokon\u010dovac\u00ed \u00faprava.<\/li>\n<li><strong>\u0158\u00edzen\u00e9 d\u00e1vkov\u00e1n\u00ed.<\/strong> Automatick\u00fd pod\u00e1vac\u00ed syst\u00e9m se dv\u011bma dopravn\u00edky nebo \u0161neky dok\u00e1\u017ee d\u00e1vkovat dv\u011b abraziva v nastaven\u00e9m pom\u011bru v pr\u016fb\u011bhu pracovn\u00edho cyklu.<\/li>\n<li><strong>P\u0159edem p\u0159ipraven\u00e1 sm\u011bs v kontrolovan\u00fdch podm\u00ednk\u00e1ch.<\/strong> Pokud je stabiln\u00ed sm\u011bs skute\u010dn\u011b pot\u0159eba, lze d\u00e1vku GH25 + GP25 p\u0159edem prom\u00edchat v rota\u010dn\u00edm bubnu, ov\u011b\u0159it homogenitu a teprve pot\u00e9 ji naplnit do provozn\u00edho z\u00e1sobn\u00edku. T\u00edm se sni\u017euje riziko nekontrolovan\u00e9 segregace p\u0159\u00edmo na lince.<\/li>\n<li><strong>Kompatibiln\u00ed druhy od jednoho v\u00fdrobce.<\/strong> M\u00edsto improvizovan\u00e9ho m\u00edch\u00e1n\u00ed GH25\/GP25 je vhodn\u00e9 zv\u00e1\u017eit abraziva s bl\u00edzkou tvrdost\u00ed a strukturou (nap\u0159. kombinaci GP a GL nebo GH a GL) nebo hotov\u00e9 sm\u011bsi vyvinut\u00e9 dodavatelem p\u0159\u00edmo pro tento \u00fa\u010del.<\/li>\n<li><strong>N\u00e1kup od jednoho dodavatele.<\/strong> Pokud GH25 i GP25 poch\u00e1zej\u00ed od jednoho v\u00fdrobce se shodnou technologi\u00ed, je pravd\u011bpodobnost jejich kompatibility v jednom procesu vy\u0161\u0161\u00ed ne\u017e p\u0159i kombinov\u00e1n\u00ed d\u00e1vek r\u016fzn\u00e9ho p\u016fvodu.<\/li>\n<\/ul>\n<h2>Shrnut\u00ed<\/h2>\n<p>GH25 a GP25 jsou chemicky t\u00e9m\u011b\u0159 shodn\u00e1 abraziva, kter\u00e1 se v\u0161ak z\u00e1sadn\u011b li\u0161\u00ed tvrdost\u00ed a chov\u00e1n\u00edm v provozu: GH25 z\u016fst\u00e1v\u00e1 ostr\u00fd a agresivn\u00ed po celou dobu \u017eivotnosti, GP25 se rychle zaobluje a p\u016fsob\u00ed m\u00edrn\u011bji. Normy ISO 11124-3 a SAE J1993 m\u00edch\u00e1n\u00ed obou druh\u016f v jednom z\u00e1sobn\u00edku form\u00e1ln\u011b nezakazuj\u00ed, ale ani neuv\u00e1d\u011bj\u00ed, jak jej prov\u00e1d\u011bt bezpe\u010dn\u011b. V praxi m\u00edch\u00e1n\u00ed zvy\u0161uje riziko ucp\u00e1v\u00e1n\u00ed z\u00e1sobn\u00edku, nerovnom\u011brn\u00e9ho pod\u00e1v\u00e1n\u00ed, rychlej\u0161\u00edho opot\u0159eben\u00ed trysek a nestabiln\u00ed kvality povrchu. Kone\u010dn\u00e9 rozhodnut\u00ed je proto vhodn\u00e9 u\u010dinit a\u017e na z\u00e1klad\u011b vlastn\u00edch zkou\u0161ek a konzultace s v\u00fdrobcem tryskac\u00edho za\u0159\u00edzen\u00ed.<\/p>\n<p>T\u00fdm Ingritech dod\u00e1v\u00e1 certifikovanou ocelovou dr\u0165 a ocelov\u00e9 broky GH25 a GP25 z Ukrajiny a zem\u00ed EU v odd\u011blen\u00fdch d\u00e1vk\u00e1ch, vybran\u00fdch pro konkr\u00e9tn\u00ed technologick\u00fd \u00fakol \u2013 pro n\u00e1ro\u010dn\u00e9 \u010di\u0161t\u011bn\u00ed, dokon\u010dovac\u00ed profilov\u00e1n\u00ed i kombinovan\u00e9 procesy. Pot\u0159ebujete vybrat abrazivum pro sv\u00e9 za\u0159\u00edzen\u00ed a typ povrchu? Kontaktujte n\u00e1\u0161 t\u00fdm \u2013 pom\u016f\u017eeme zvolit optim\u00e1ln\u00ed druh a zrnitost.<\/p>\n<h2>Nej\u010dast\u011bj\u0161\u00ed dotazy ke GH25 a GP25<\/h2>\n<h3>Lze GH25 a GP25 m\u00edchat v jednom z\u00e1sobn\u00edku?<\/h3>\n<p>Form\u00e1ln\u011b ano \u2013 ob\u011b abraziva jsou magnetick\u00e1 a spl\u0148uj\u00ed stejn\u00e9 normy (ISO 11124-3, SAE J1993). Bez p\u0159edchoz\u00edch zkou\u0161ek se v\u0161ak m\u00edch\u00e1n\u00ed nedoporu\u010duje kv\u016fli riziku ucp\u00e1v\u00e1n\u00ed z\u00e1sobn\u00edku, segregace sm\u011bsi a nestabiln\u00ed kvality trysk\u00e1n\u00ed. Bezpe\u010dn\u011bj\u0161\u00ed volbou jsou odd\u011blen\u00e9 z\u00e1sobn\u00edky nebo \u0159\u00edzen\u00e9 d\u00e1vkov\u00e1n\u00ed.<\/p>\n<h3>Jak\u00fd je hlavn\u00ed rozd\u00edl mezi GH25 a GP25?<\/h3>\n<p>Hlavn\u00ed rozd\u00edl je v tvrdosti a chov\u00e1n\u00ed zrna. GH25 m\u00e1 tvrdost 60\u201366 HRC a b\u011bhem provozu si zachov\u00e1v\u00e1 ostr\u00e9 hrany, proto je vhodn\u00fd pro hrub\u00fd profil a odstra\u0148ov\u00e1n\u00ed okuj\u00ed. GP25 m\u00e1 42\u201351 HRC a v pr\u016fb\u011bhu trysk\u00e1n\u00ed se rychle zaobluje, tak\u017ee povrch upravuje \u0161etrn\u011bji.<\/p>\n<h3>Co zvolit pro trysk\u00e1n\u00ed \u2013 GH25, nebo GP25?<\/h3>\n<p>Pro n\u00e1ro\u010dn\u00e9 pr\u00e1ce, jako je hloubkov\u00e9 \u010di\u0161t\u011bn\u00ed, odstra\u0148ov\u00e1n\u00ed siln\u00fdch okuj\u00ed nebo vytvo\u0159en\u00ed hrub\u00e9ho kotvic\u00edho profilu pod n\u00e1t\u011br, je vhodn\u011bj\u0161\u00ed GH25. Pro b\u011b\u017en\u00e9 odstran\u011bn\u00ed rzi a okuj\u00ed bez nadm\u011brn\u00e9ho po\u0161kozen\u00ed z\u00e1kladn\u00edho materi\u00e1lu se l\u00e9pe hod\u00ed m\u011bk\u010d\u00ed a hou\u017eevnat\u011bj\u0161\u00ed GP25.<\/p>\n<h3>Maj\u00ed GH25 a GP25 stejnou zrnitost?<\/h3>\n<p>Ano, oba druhy se vyr\u00e1b\u011bj\u00ed ve frakci G25 podle SAE J444 s jmenovitou velikost\u00ed zrna p\u0159ibli\u017en\u011b 0,8\u20131,2 mm. Li\u0161\u00ed se tedy pouze tvrdost\u00ed a chov\u00e1n\u00edm zrna b\u011bhem provozu, nikoli velikost\u00ed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>GH25 a GP25: jak\u00fd je rozd\u00edl a lze tyto druhy ocelov\u00e9 drti m\u00edchat GH25 a GP25 jsou dva nejpou\u017e\u00edvan\u011bj\u0161\u00ed druhy vysokouhl\u00edkov\u00e9 ocelov\u00e9 drti (ocelov\u00e9ho gritu) pro trysk\u00e1n\u00ed kovov\u00fdch povrch\u016f. Oba materi\u00e1ly maj\u00ed stejnou zrnitost G25 a t\u00e9m\u011b\u0159 shodn\u00e9 chemick\u00e9 slo\u017een\u00ed, proto se z\u00e1kazn\u00edci \u010dasto ptaj\u00ed, zda je lze nasypat do jednoho z\u00e1sobn\u00edku a zda je [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":13672,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[671],"tags":[893,722],"class_list":["post-13799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-abrazivni-obrabeni","tag-ocelova-drt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GH25 a GP25: rozd\u00edl a lze je m\u00edchat?<\/title>\n<meta name=\"description\" content=\"Rozd\u00edl mezi ocelovou drt\u00ed GH25 a GP25: tvrdost, tvar zrna a pou\u017eit\u00ed. 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