車(che)間(jian)隔離柵表面防腐(fu)形(xing)式有熱鍍、噴塑(su)、浸塑(su)。
1.熱鍍(du)(du)鋅(xin)(xin)是將工(gong)件除(chu)油、酸洗、浸(jin)藥、烘干后(hou)浸(jin)入融化(hua)的(de)鋅(xin)(xin)液里(li)一(yi)定(ding)時間(jian),提出來即(ji)可(ke)。熱鍍(du)(du)鋅(xin)(xin)車間(jian)隔離(li)柵(zha)外觀比電(dian)(dian)鍍(du)(du)鋅(xin)(xin)稍微(wei)粗糙,呈銀白色,外觀容易生(sheng)產工(gong)藝水紋和少(shao)許(xu)滴(di)瘤(liu),尤其實在工(gong)件的(de)一(yi)端較(jiao)為明(ming)顯。但熱鍍(du)(du)鋅(xin)(xin)的(de)鋅(xin)(xin)層比電(dian)(dian)鍍(du)(du)鋅(xin)(xin)厚(hou)幾(ji)十(shi)倍,防(fang)腐蝕性強(qiang),是電(dian)(dian)鍍(du)(du)鋅(xin)(xin)的(de)十(shi)幾(ji)倍。
2.噴塑是利(li)用電(dian)(dian)(dian)(dian)(dian)暈放電(dian)(dian)(dian)(dian)(dian)現象使(shi)粉(fen)末(mo)(mo)(mo)(mo)(mo)涂(tu)(tu)料(liao)吸附(fu)在(zai)工(gong)件(jian)上(shang)的(de)。其過程是這樣(yang)的(de):粉(fen)末(mo)(mo)(mo)(mo)(mo)涂(tu)(tu)料(liao)由(you)供粉(fen)系統借壓縮空氣(qi)氣(qi)體送入噴槍(qiang),在(zai)噴槍(qiang)前(qian)端加有(you)高(gao)壓靜(jing)電(dian)(dian)(dian)(dian)(dian)發生(sheng)器(qi)產(chan)生(sheng)的(de)高(gao)壓,由(you)于電(dian)(dian)(dian)(dian)(dian)暈放電(dian)(dian)(dian)(dian)(dian),在(zai)其附(fu)近產(chan)生(sheng)密集的(de)電(dian)(dian)(dian)(dian)(dian)荷,粉(fen)末(mo)(mo)(mo)(mo)(mo)由(you)槍(qiang)嘴噴出時,形(xing)成(cheng)帶電(dian)(dian)(dian)(dian)(dian)涂(tu)(tu)料(liao)粒(li)子(zi),它受(shou)靜(jing)電(dian)(dian)(dian)(dian)(dian)力的(de)作用,被(bei)吸到(dao)(dao)與(yu)其極性相反的(de)工(gong)件(jian)上(shang)去,隨著噴上(shang)的(de)粉(fen)末(mo)(mo)(mo)(mo)(mo)增多(duo),電(dian)(dian)(dian)(dian)(dian)荷積聚也越多(duo),當達到(dao)(dao)一(yi)定厚度時,由(you)于產(chan)生(sheng)靜(jing)電(dian)(dian)(dian)(dian)(dian)排斥(chi)作用,便不繼(ji)續(xu)吸附(fu),從而使(shi)整個工(gong)件(jian)獲(huo)得一(yi)定厚度的(de)粉(fen)末(mo)(mo)(mo)(mo)(mo)涂(tu)(tu)層,然后(hou)經過加熱(re)使(shi)粉(fen)末(mo)(mo)(mo)(mo)(mo)熔融(rong)、流(liu)平、固化,即在(zai)工(gong)件(jian)表面形(xing)成(cheng)堅(jian)硬的(de)涂(tu)(tu)膜。
3.浸塑別名又(you)稱涂(tu)塑,熱浸塑,熱敷涂(tu)塑。
(1). 預熱:將車間隔離柵送入烤箱中,讓(rang)模具(ju)(ju)吸收熱量,以便于(yu)浸塑(su)時塑(su)溶膠在熱車間隔離柵表(biao)面產生(sheng)吸附,模具(ju)(ju)的體積大小和塑(su)溶膠種類不同,預熱溫(wen)度和時間也不同。
(2). 浸(jin)(jin)(jin)塑(su):將預熱的車間隔離(li)柵(zha)浸(jin)(jin)(jin)入到塑(su)溶膠中,一般(ban)浸(jin)(jin)(jin)入速度(du)≤10mm/s,車間隔離(li)柵(zha)提升(sheng)速度(du)≤5mm/s。浸(jin)(jin)(jin)塑(su)時(shi)間根據車間隔離(li)柵(zha)體積大小和產品厚度(du)來設定(ding),一般(ban)控制(zhi)在(zai)1 ~ 60s。
(3). 塑(su)(su)化(hua):將已(yi)經浸塑(su)(su)的車間隔離柵送入烤箱中,對模具及其附著的塑(su)(su)溶(rong)(rong)膠加熱,目的是使(shi)塑(su)(su)溶(rong)(rong)膠塑(su)(su)化(hua)成型,塑(su)(su)化(hua)溫度(du)(du)和時間根據車間隔離柵材質、體積大小以及產品硬度(du)(du)、厚度(du)(du)來設定。一般塑(su)(su)化(hua)溫度(du)(du)為200 ~350℃,塑(su)(su)化(hua)時間10 ~ 90s。
(4). 冷(leng)卻:塑(su)化完成的車間隔離柵(zha)離開烤箱,降低溫度使成型品(pin)進入(ru)常溫狀態,冷(leng)卻方式包括水(shui)冷(leng)和風冷(leng)。