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至賢五金制品
至賢 — 精湛的鑄造技術
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您的位置: 首頁 ->  行業資訊 -> 淺析鑄造缺陷修復的方法
作為鑄造行業往往對于鑄造時候的缺陷,想盡辦法解決。采取了不少的修復方法。
  一、鑄工膠水:簡單,粗放的鑄件,一般修補處不需要后續加工,且沒有特殊的強度硬度要求。這類鑄件附加值比較低。
  二、焊補:90%以上的鑄造廠家都選擇焊補來解決生產中遇到的鑄造缺陷。焊補修復因采用了金屬填充料,焊補處性能基本可以達到母材的標準,且操作簡單,焊補效率高,受到許多廠家的認可和信賴。目前市場上,焊機種類比較多,應用在缺陷修復上,大體有以下幾種:
  電焊機:鑄鐵、鑄鋼件焊補多采用的傳統方式。
  優點:修復大缺陷,效率高。
  缺點:焊后焊點上硬度過高,內部有應力,容易產生裂紋,一般還需要退火熱處理才可以滿足加工要求。且因焊接條件限制,內部容易產生氣孔、夾渣等二次缺陷。
  氬弧焊:精密鑄件,鋁合金壓鑄件多采用氬弧焊機焊補。部分模具制造和修復廠家,也采用該焊機修復模具缺陷。
  1、優點:焊補效率高,精度較電焊機高。焊絲種類較多,不銹鋼、鋁合金產品上應用最廣。可用于焊接,強度教高。
  2、缺點:用于缺陷修復,小缺陷修復時,因沖擊過大,熔池邊線有痕跡。焊補鋼件有硬點。由于熱影響,焊補有色鑄件或薄壁件時,易產生熱變形。操作技術要求較高。
  三、冷焊機:是21世紀初新誕生的修復技術,因焊補過程中工件產生熱量極小,被成為冷焊機。經過幾年的發展,焊機應用方向和技術都得到了很大的發展,已經在修復市場占有很大的份額。按照修補產品分類有:貼片機和電火花堆焊修復機。
  貼片機:采用瞬間高頻放電原理將焊片粘貼到工件表面,每次粘貼厚度最大等同與焊片厚度,焊接質量取決于放電是否均勻。適合于工件磨損,加工超差修復,在模具市場具有一定影響力。該機器也可以將焊粉,填充到缺陷處,經放電后修復。修復后的工件色差小。缺點是修補的速度較慢。冷焊機,共同的缺點是,焊補效率不如電焊機和氬弧焊機高,但在修復毫米級缺陷和加工面缺陷時,其突出的優勢使人們更青睞于選擇冷焊。
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