118彩票

模具設計常識

日期:2018-05-31?

模具的定義:

      模具是一種有一定形狀與尺寸的型腔工具,與模具內各種系統或輔助機構配合使用,將各種高溫液態的材料(塑料或金屬合金等)填充至模具型腔內,即可生產出具有特定的形狀、尺寸、功能和質量的工業零件。


模具的作用:
    (1)模具工業是高新技術產業的一個組成部分。例如,集成電路的設計與制造,不能沒有做引線框架的精密級進沖模和精密的集成電路塑封模;

    (2)模具工業又是高新技術產業化的重要領域。CAD/CAE/CAM技術發生了重要變革,模具的開發和制造水平的提高有利于采用數控精密、高效的加工設備;逆向工程、并行工程、敏捷制造、虛擬技術等先進技術在模具工業中的應用也要與電子信息等高新技術嫁接,實現高新技術產業化。


模具設計與制造發展趨勢:
    (1)模具設計由經驗設計階段向理論計算和計算機輔助設計方向發展
    (2)模具向高精度大型和超小型方向發展。10年前,精密模具的精度為5um,現在已達2--3um,有些模具的加工精度要求在1um以內,這就要求發展超精加工,減少鉗工等手工操作量。
    (3)隨著熱流道技術的日益推廣應用,熱流道模具能大幅度節約制作的原材料。
    (4)多功能復合模具將進一步發展,多色和多材質塑料成型模具也將有較快發展。
    (5)隨著塑料成型工藝的不斷改進與發展,氣輔模具及適應高壓注射成型等工藝的模具將隨之發展。塑料件的精度分尺寸精度、幾何形狀精度和外觀精度(光澤、色調)3種。在注射成型中,影響成型件精度的最大因素是成型收縮,高壓注射成型可減小樹脂收縮率,增加塑件尺寸的穩定性。"""
    (6)模具標準件的應用將日益廣泛。如塑料、沖壓模胚、頂針、司筒、螺絲和彈簧等。

    (7)快速經濟模具的前景十分廣闊。現在是多品種小批量生產的時代。研制各種超塑性材料來制作模具,用環氧(E)聚酯(P)或其中填充金屬(M)、玻璃(G)等增強物制作簡易模具。電鑄模、精鑄模、層迭模、陶瓷吸塑模、環氧樹酯模及光造型等快速經濟模具將進一步發展。


118彩票
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