portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">冷熱沖擊測(cè)試是用來評(píng)估產(chǎn)品對(duì)工作環(huán)境溫度驟然變化的適應(yīng)能力，是產(chǎn)品設(shè)計(jì)成型的考核實(shí)驗(yàn)和批產(chǎn)階段的例行實(shí)驗(yàn)中不可或缺的實(shí)驗(yàn)，在一些情況下還可以用于環(huán)境應(yīng)力篩選實(shí)驗(yàn)。冷熱沖擊測(cè)試在品質(zhì)考核檢測(cè)方面的應(yīng)用頻率僅次于振動(dòng)試驗(yàn)和高低溫試驗(yàn)。

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測(cè)試目的：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">測(cè)試產(chǎn)品在高溫和低溫快速變化條件下工作和存儲(chǔ)的情況。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測(cè)試原理：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">環(huán)境溫度驟然變化時(shí)，由于熱脹冷縮效應(yīng)引起交變應(yīng)力，導(dǎo)致材料開裂、接觸不良、性能變化等狀況。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">冷熱沖擊測(cè)試的方法：portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">1.實(shí)驗(yàn)前對(duì)受試產(chǎn)品做好機(jī)械性能(外觀和內(nèi)部結(jié)構(gòu))和電氣性能檢查，確保產(chǎn)品機(jī)械性能和電氣性能正常。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">2.將產(chǎn)品合理的布置于冷熱沖擊箱中，產(chǎn)品和環(huán)境溫度箱四壁間應(yīng)留有足夠大的空間，以便于空氣流通。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">3.按標(biāo)準(zhǔn)規(guī)范選擇冷熱沖擊測(cè)試條件。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">4.選定冷熱沖擊測(cè)試從高溫開始，按啟動(dòng)鍵啟動(dòng)冷熱沖擊測(cè)試。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">5.實(shí)驗(yàn)做好設(shè)定的循環(huán)次數(shù)后自動(dòng)停止。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">6.實(shí)驗(yàn)結(jié)束后將產(chǎn)品從冷熱沖擊箱中取出，在常溫下恢復(fù)直到產(chǎn)品環(huán)境溫度穩(wěn)定。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">7.觀察實(shí)驗(yàn)后的產(chǎn)品有無機(jī)械損傷(如表面翹曲、破裂、元器件松動(dòng)、脫落等)并檢查電氣性能有無異常。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">8.如果產(chǎn)品發(fā)生上述的機(jī)械損傷或電氣性能指標(biāo)不符合相關(guān)規(guī)范，即認(rèn)為產(chǎn)品也損壞，完整填寫實(shí)驗(yàn)記錄表。portant; margin-right: 0px !important; margin-left: 0px !important; width: auto !important;">

portant; margin-bottom: 20px !important; width: auto !important; line-height: 2em !important;">9.對(duì)實(shí)驗(yàn)暴露的薄弱點(diǎn)做好分析，提出整改措施。