Statistik jarayonlar nazorati (SPC) va o‘lchash tizimlari tahlili (MSA) asosida ishlab chiqarish jarayonlari barqarorligini ta’minlash
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SPC, MSA, statistik jarayonlar nazorati, o‘lchash tizimi, takrorlanuvchanlik, qayta tiklanuvchanlik, GRR, X̄-R nazorat kartasi, Cp, Cpk, Pp, Ppk jarayon barqarorligi, avtomobilsozlikAbstrak
Maqolada ishlab chiqarish jarayonlari barqarorligini ta’minlashda statistik jarayonlar nazorati (Statistical Process Control - SPC) va o‘lchash tizimlarini tahlil qilish (Measurement Systems Analysis - MSA) usullarini qo‘llashning ilmiy-amaliy jihatlari tadqiq etilgan. Misol sifatida avtomobilsozlikda qo‘llaniladigan COVER ASM - STRG COL LWR detalining nazorat qilinadigan o‘lcham parametri tanlangan. Jarayon barqarorligi X̄-R nazorat kartalari, jarayon qobiliyati Cp va Cpk hamda jarayon unumdorligi Pp va Ppk ko‘rsatkichlari orqali baholangan. O‘lchash tizimining ishonchliligi esa takrorlanuvchanlik (EV), qayta tiklanuvchanlik (AV), ularning yig‘ma ko‘rsatkichi GRR va farqlanadigan kategoriyalar soni (ndc) asosida aniqlangan. 125 ta o‘lchash natijasi bo‘yicha jarayon o‘rtachasi 3,9988 mm, Cp=1,319 va Cpk=1,835 ni tashkil etdi; nazorat kartalarida jarayonning statistik nazorat chegaralaridan chiqishi aniqlanmadi. MSA tadqiqotida %EV=20,22 %, %AV=3,20 %, %GRR=20,47 % va ndc=6,74 natijalari olindi. Natijalar o‘lchash tizimining jarayonni tahlil qilish uchun yetarli darajada farqlash qobiliyatiga ega ekanligini, biroq takrorlanuvchanlik komponenti bo‘yicha takomillashtirish zaxirasi mavjudligini ko‘rsatdi. Taklif etilgan SPC-MSA ketma-ketligi sifat ko‘rsatkichlarini baholashda o‘lchash xatosi bilan haqiqiy jarayon variatsiyasini ajratish va boshqaruv qarorlarining ishonchliligini oshirish imkonini beradi.
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