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  • 鑄鐵平台廠家帶大家認識鑄造方法對鑄件結構的要求
  • 本站編輯:杭州环亚AG国际厅機械有限公司發布日期:2019-10-18 19:17 瀏覽次數:
鑄鐵平台廠家帶大家認識鑄造方法對鑄件結構的要求
 
(一)熔模鑄件:
 
1.便於蠟模的製造
 
2.鑄件上的孔、槽不宜過小或過深過小或過深的孔、槽,不利於製殼時塗料和砂粒順利地充填熔模上相應的孔洞,形成合適的型腔;同時,過深的孔、槽也給鑄件的清砂工作帶來困難。通常,孔徑應大於2mm(薄件>0.5mm)。通孔時,孔深/孔徑<4-6,不通孔時,孔深/孔徑<2。槽寬應大於2mm,槽深不超過槽寬的2-6倍。
 
 
 
 
3.減少熱節,壁厚力求均勻熔模鑄造一般不單獨設置冒口,而是利用加粗的直澆道作為冒口直接補縮鑄件。與此工藝相適應,應盡量采用薄壁結構,並使壁厚分布符合定向凝固原則。
 
 
 
4.避免大平板結構由於熔模型殼的高溫強度較低,容易變形,所以設計鑄件結構時,應盡量避免大的平麵。
 
(二)金屬型鑄件:
 
1.鑄件的外形和內腔應力求簡單,盡可能加大鑄件的結構斜度,避免采用直徑過小或過深的孔,以便於抽出型芯和保證鑄件順利取出。
 
2.鑄件的壁厚要均勻,以防出現縮鬆和裂紋缺陷;同時要注意壁厚不能太薄,盡量避免大的水平壁,以防止澆不到、冷隔等缺陷,如鋁矽合金鑄件的最小壁厚為2mm~4mm,鋁鎂合金的最小壁厚為3mm-5mm。
 
(三)壓鑄件:
 
1.壓鑄件應盡量消除側凹和深腔。
 
2.盡量采用壁厚均勻的薄壁結構。壓鑄件適宜的壁厚一般為:鋅合金1mm-3mm,鋁合金1.5mm-5mm,銅合金2mm-5mm。
 
3.壓鑄可以采用鑲嵌件,應充分發揮鑲嵌件的優越性,以便製出複雜件、改善壓鑄件局部性能和簡化裝配工藝。為使嵌件在鑄件中的聯接可靠,應將嵌件鑲入鑄件部分製出凹槽、凸台或滾花等。
Cast iron platform manufacturers bring everyone to understand the casting method of casting structure requirements
 
 
 
(I) investment casting:
 
 
 
1. Easy to make wax mold
 
 
 
2. The holes and grooves in the casting should not be too small or too deep, which is not conducive to the coating and sand grains filling the corresponding holes in the melt mold smoothly during shell making and forming an appropriate mold cavity; At the same time, too deep holes and grooves also bring difficulties to sand removal of castings. In general, the aperture should be larger than 2mm(thin > 0.5mm). When the hole is through, the hole depth/aperture is < 4-6; when the hole is not through, the hole depth/aperture is < 2. The width of the groove shall be greater than 2mm, and the depth of the groove shall not exceed 2-6 times the width.
 
 
 
 
 
 
 
 
 
3. Reduce hot spot and make the wall thickness as uniform as possible in investment casting. Generally, the riser is not set separately, but the thickened direct runner is used as the riser to directly supplement the casting. The thin-wall structure should be adopted as far as possible and the distribution of wall thickness should conform to the principle of directional solidification.
 
 
 
 
 
 
 
Due to the low strength at high temperature of the melted model shell, it is easy to deform. Therefore, it is necessary to avoid large plane when designing casting structure.
 
 
 
(ii) metal casting:
 
 
 
1. The shape and inner cavity of the casting should be as simple as possible, and the structural inclination of the casting should be increased as much as possible to avoid the hole with too small or too deep diameter, so as to facilitate the core extraction and ensure the smooth removal of the casting.
 
 
 
2. The casting wall thickness should be uniform to prevent shrinkage and crack defects; At the same time, it should be noted that the wall thickness should not be too thin and large horizontal wall should be avoided as much as possible to prevent defects such as uncasting and cold insulation. For example, the minimum wall thickness of al-si alloy casting should be 2mm~4mm, and the minimum wall thickness of al-mg alloy should be 3mm-5mm.
 
 
 
(3) die-casting parts:
 
 
 
1. The die casting should be as far as possible to eliminate side concave and deep cavity.
 
 
 
2. Use thin-wall structure with uniform wall thickness as far as possible. The suitable wall thickness for die casting is generally 1mm-3mm for zinc alloy, 1.5mm for aluminum alloy and 2mm-5mm for copper alloy.
 
 
 
3. Inlaid parts can be used in die casting. The advantages of inlaid parts should be given full play to make complex parts, improve the local performance of the die casting parts and simplify the assembly process. In order to make the connection of the insert in the casting reliable, the insert should be made into groove, boss or knurling etc.