Vim li cas thiaj siv cov kab kos saum npoo av? Yog vim li cas peb
Dec 14, 2021
Tso lus
Ra thiab lwm qhov chaw ua kom tiav
Ib hom hlau nto tiav daim ntawv qhia yuav piav qhia txog qhov kawg ntawm qhov kawg, uas yog, qhov sib txawv ntawm kev ntsuas thiab kev suav lej siv los piav txog qhov ua tiav. Xws li daim ntawv qhia saum npoo tuaj yeem suav nrog cov hauv qab no:
Qhov feem ntau siv parameter yog qhov nruab nrab roughness (Ra). Qhov no yog qhov nruab nrab ntev (los yog qhov siab nruab nrab) nruab nrab ntawm tag nrho cov crests thiab troughs ntawm nthwv dej xam los ntawm qhov nruab nrab kab ntawm qhov chaw. Vim tias nws tuaj yeem cuam tshuam qhov pom tseeb ntawm qhov chaw tawm, Ra yog qhov tsis hnov tsw rau qee zaus spikes thiab grooves.
Lub hauv paus txhais tau tias square roughness (RMS) zoo ib yam li Ra, tab sis feem ntau suav hais tias yog qhov kwv yees thiab yog li ntawd tsawg dua Ra. RMS yog xam siv ib qho algorithm uas saib rau lub hauv paus square ntawm lub square txhais tau tias muaj nuj nqis. Yeej, RMS hloov pauv qhov profile rau hauv sine yoj thiab ntsuas qhov nruab nrab ntawm qhov nkhaus ntawm kab nruab nrab.
Qhov siab tshaj plaws roughness qhov tob (Rmax) ntsuas qhov kev ncua deb ntawm qhov siab tshaj plaws mus rau qhov qis tshaj plaws hauv qhov ntsuas qhov ntev thiab xaiv qhov siab tshaj plaws ntawm qhov ntsuas. Raws li cov txheej txheem rhiab heev rau kev kwv yees qhov chaw tiav, Rmax yog qhov cuam tshuam rau burrs lossis khawb uas ua rau muaj kev nyeem ntawv ntau dua uas qhia txog qhov rougher zuag qhia tag nrho.
Lub ntsiab lus roughness (Rz) yog xam los ntawm qhov nruab nrab ntawm qhov siab ntawm tsib lub siab tshaj plaws thiab qhov tob ntawm tsib qhov qis tshaj. Vim tias Rz tsuas yog saib ntawm qhov xwm txheej hnyav, qhov tseem ceeb nws tsim tau zoo li siab thiab yuav tsis raug cuam tshuam qhov nruab nrab ntawm qhov kawg.
Hauv kev txiav hlau, peb feem ntau sim Ra, uas yog qhov yuav tsum tau ntawm feem ntau ntawm peb cov neeg siv khoom. Txawm hais tias Ra thiab RMS qee zaum siv sib hloov, raws li qhov kwv yees hloov pauv tau yog RMS=Ra x 1.11, cov neeg siv khoom tau txhawb kom siv Ra. Nws suav hais tias yog qhov tseeb dua thiab tau txais dav hauv kev lag luam.
Thov hu rau peb ntawm zhang@pride-cnc.com
