| 精铸工艺流程 |
| 添加时间：2018/11/13 14:16:39 浏览次数： |
| 1、根据不同形状的产品做模具。模具分上下凹模方式，通过车、刨 、铣 、蚀、电火花等 综合工序完成。凹坑形状、尺寸跟产品半边一致。因为腊模主要用于工业蜡压型使用，因此选用熔点不高，硬度不高、要求较低、价格较便宜、重量较轻的铝合金材料做模具。 1, make moulds according to different shapes of products. The die is divided into upper and lower die modes, which are completed through comprehensive processes such as vehicle, planing, milling, erosion and electric spark. The shape and size of the pits are consistent with the halves of the product. Because wax moulds are mainly used for industrial wax moulding, aluminium alloys with low melting point, low hardness, lower requirements, cheaper price and lighter weight are selected as moulds. 2、利用铝合金模具生产出大量的工业蜡实芯模型。在正常情况下一只工业蜡实芯模型只能对应出一只毛坯产品。 2. A large number of industrial wax core models are produced by using aluminum alloy dies. Under normal circumstances, an industrial wax core model can only produce one blank product. 3、对蜡模周边余量进行精修，去毛刺后将多个单一蜡模粘在(又称组树)预先准备好的 模头上，此模头也是用蜡模生产出的工业蜡实芯模型。(外形很像一棵树) 3. To refine the margin of wax mould, after deburring, several single wax models are adhered to the pre-prepared die (also known as group tree). This die is also an industrial wax solid core model produced by wax mould. (looks like a tree). 4、将已固定在模头上的多个蜡模涂上工业胶水后均匀喷上第一层细砂(一种耐火砂、耐高温，通常用的是硅沙)。此砂颗粒很小、很细，这样能确保最终毛坯表面尽量的光滑。 4. Spray the first layer of fine sand (a kind of refractory sand, high temperature resistance, usually silicon sand) evenly after applying industrial glue to several wax patterns fixed on the die head. The sand particles are very small and fine, so that the final surface of the blank can be smoothed as smooth as possible. 5、在设定的室温(或恒温)下让喷了第一层细砂的蜡模自然风干，但不能影响内部蜡模形状变化，自然风干的时间取决于产品本身内部的复杂程度，一般精铸件第一次的风干时间大约在5—8h。 5. Let the wax mold sprayed with the first layer of fine sand be air-dried naturally at the set room temperature (or constant temperature), but it can not affect the shape change of the internal wax mold. The time of natural air-drying depends on the complexity of the product itself. The first air-drying time of the general precision castings is about 5-8 hours. 6、第一次砂喷完并自然风干后，在蜡模的表面继续上工业胶水(硅溶浆)，并喷上第二层 砂，第二层砂颗粒大小要比之前的第一层砂来的大、来的粗。喷完第二层砂后也是在设定的恒温下让蜡模自然风干。 6. After the first sand blasting and natural air-drying, industrial glue (silica slurry) is continued on the surface of the wax mould, and a second layer of sand is sprayed. The size of the second layer of sand particles is larger and thicker than that of the previous first layer. After spraying second layers of sand, the wax mold is dried naturally under constant temperature. 7、第二次砂喷完并自然风干后，依次类推进行第三次喷砂，第四次喷砂，第五次喷砂等工 序。 要求： - 根据产品表面要求，体积大小，自重等相应调节喷砂次数。一般情况下喷砂次数为3-7次。 每次喷砂的砂粒大小均不一样，通常后道工序的砂粒均较前道工序砂粒粗，风干的时间长短也不一样。一般一个完整的蜡模上砂的生产周期为3~4天左右。 7. After the second sand blasting and natural air drying, the third sand blasting, the fourth sand blasting and the fifth sand blasting are carried out in turn. Requirements: according to the product's surface requirements, size, weight and so on, adjust sand blasting times accordingly. In general, sandblasting frequency is 3-7 times. The size of sand grains varies from time to time. Usually, the sand grains in the later process are thicker than those in the previous process, and the time of air drying is also different. In general, the production period of a complete wax mold is about 3~4 days. 8、将已完成喷砂工序的蜡模在烘烤工序前，再均匀涂上一层白色的工业乳胶(硅溶浆)，以起到粘结和固化砂型，以及密封蜡模作用，为后道烘烤工序做准备。同时在烘烤工序后，还能提高砂型的脆性，便于敲碎砂层，取出毛坯。 8. Apply white industrial latex (silica slurry) to the wax mold which has completed the sand blasting process before the baking process to bind and solidify the sand mold and seal the wax mold, so as to prepare for the later baking process. At the same time, after the baking process, it can also improve the brittleness of the sand mold, easy to break the sand layer and take out the blank. 9、烘烤工序 将固定在模头上、并完成喷砂风干工序的蜡模放入金属密闭的专用烘箱里加热(常用是 烧煤油的蒸气炉)。因工业腊熔点不高，温度约在150゜，蜡模受热溶化形成腊水沿着浇口流出，这个过程即为脱腊。脱完蜡的蜡模只是一具空的砂壳。精密铸造的关键就是用这具空的砂壳。(一般这种腊可以反复使用多次，但这些腊必须重新过滤，否则不干净的腊会影响毛坯表面质量，例如：表面砂孔、麻点，同时还会影响精铸产品的收缩率)。 9. The wax mould fixed on the die head in the baking process and completed the sand blasting and air-drying process is heated in a metal-sealed special oven (usually a kerosene-burning steam oven). Because the melting point of industrial wax is not high and the temperature is about 150, wax mould is melted by heat to form wax water flowing out along the gate. This process is dewaxing. Wax pattern wax is only an empty sand shell. The key to precision casting is to use this empty sand shell. Generally, this kind of wax can be used repeatedly, but these waxes must be re-filtered. Otherwise, the unclean wax will affect the surface quality of the blank, such as sand holes and pits on the surface, as well as the shrinkage rate of the investment casting products. |
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