Hauv kev tsim qauv ntawm cov khoom siv hluav taws xob, snap-cov qauv haum yog qhov tsis muaj qhov xav tau ntau tshaj plaws ntawm kev kho vaj tse. Lawv siv cov elastic deformation ntawm cov ntaub ntawv yas kom ua tiav kev sib txuas thiab snapping. Nov yog qee cov qauv tsim thiab cov yam ntxwv ntawm snap- haum.
1. Snap-Fit Layout
Snap-fits yuav tsum muab sib npaug sib npaug ntawm ib puag ncig ntawm qhov ntau li ntau tau. Rau cov cheeb tsam uas ua rau deformation (xws li cov ces kaum ntawm ib feem), xav txog qhov muab snap- haum rau ze rau cov chaw no. Kev tsim thiab kev teeb tsa ntawm snap- haum feem ntau yuav tsum tau koom tes nrog daim di ncauj thiab txee- daim di ncauj kom ua tiav qhov chaw zoo thiab kho vaj tse.
Nqe lus piav qhia ntawm daim duab: Rooj nrog cov ntsiab lus hauv qab no:
Number Definition Recommended Value Note
Ib qho Clearance ntawm poj niam snap thiab vaj tse 0.20 Ntau dua lossis sib npaug rau 0.20, rau kev hloov pauv tsim yav tom ntej
B Fitting clearance 0.1
C Engagement Yas 0.50 / Hlau 0.3 0.30~ 1.00
D Txhim kho phab ntsa ntawm poj niam snap 0.50 Ntau dua lossis sib npaug rau 0.4 ~ 0.6
E Clearance nruab nrab ntawm snaps 0.30 Ntau dua lossis sib npaug rau 0.30, rau kev hloov pauv tsim yav tom ntej
F Ntev ntawm txiv neej snap 4.00 2.50~6.00
G Clearance ntawm snaps 0.30 Ntau dua lossis sib npaug rau 0.30
H Thickness ntawm txiv neej snap 1.00 1.00~1.20
Kuv Thickness ntawm poj niam snap 1.00 1.00~1.20
2. Snap- Haum rau Kev Tawm Tsam Tawm (Undercut)
Nws raug nquahu kom siv segmented tsim, feem ntau siv rau qhov chaw nrog kev sib koom ua ke tsawg lossis tsim los ntawm cov roj hmab muag muag. Pwm siv yuam ejection rau demolding. Tus nqi qis feem ntau yuav tsum tsis pub tshaj 0.25mm. Cov khoom lag luam nyuaj yuav tsum tau txiav qis dua, xws li cov kaus mom lub raj mis rau cov khoom siv tshuaj txhua hnub, lub kaus mom cwj mem, thiab lwm yam.
Kev piav qhia ntawm daim duab: Poj niam undercut, siv pwm yuam ejection, undercut tus nqi feem ntau tsis tshaj 0.25mm.
3. Rau qhov dav dua - haum, txhawm rau txhim kho lub zog ntawm tus poj niam snap, ob lub snap me me - haum tuaj yeem tsim nyob rau hauv ib qho loj. Ribs tuaj yeem muab ntxiv rau sab nraub qaum ntawm snap- haum los txhim kho nws lub zog.
Cov lus piav qhia ntawm daim duab: Ib daim ntawv ruaj khov - xauv, uas yog ib qho nyuaj rau disassemble tshaj snap- haum rau sab hauv phab ntsa ntawm lub tsev.
4. Tus tsim ntawm snap-fits yuav tsum pab txhawb pwm demolding. Ua tib zoo saib kom tsis txhob cuam tshuam nrog txoj kev txav ntawm cov lifters hauv cov qauv sab hauv ntawm cov khoom. Yog tias ua tau, nyiam qhov "kaw-tawm" tsim los siv cov lifters.
Cov lus piav qhia ntawm daim duab: Siv kaw- tawm kom tsis txhob muaj pwm nyuaj.
5. Rau kev sib txuas ntawm cov ntaub ntawv yas thiab hlau siv snap- haum, feem ntau, yas ua haujlwm raws li tus txiv neej snap, thiab hlau raws li poj niam snap. Cov yam ntxwv feem ntau yog tsim los ntawm T-slot cutter ntawm lub tshuab CNC.
Cov lus piav qhia ntawm daim duab: Daim ntawv hauv qab ntawm lub plhaub hlau, zoo li tus T-slot cutter ntawm lub tshuab CNC.
6. Kev koom tes ntawm snap- haum yog feem ntau tsim raws li qhov xav tau tiag tiag. Kev koom tes hauv qab 0.5mm yog suav tias yog "nyob xauv" (tshem tawm), thaum siab tshaj 0.5mm yog suav tias yog "tso xauv" (ntev lossis nyuaj tshem tawm). Rau cov ntaub ntawv xws li roj teeb npog, kev koom tes tuaj yeem tsim los rau 1mm lossis ntau dua.
