Case-making method of silicasol investment casting with elongated hole structure

Abstract

The invention relates to a case making method of a silica sol investment casting with a slender hole structure, and the method is achieved through adopting the following steps of max mould preparation 1, doping 2, sanding 3, drying 4, in-hole grouting 5, continuous case making 6, demaxing 7 as well as roasting and casting 8, wherein the steps between the doping 2 and the drying 4 are adopted for 2-3 times; wherein in the step 5, the in-hole grouting is achieved through the following steps: soft white slime is used for plugging up the lower end and a lateral hole of a part, and a stainless steel wire used for ensuring that a mandril is not fractured at the end part is inserted into the end part of the hole, and the diameter of the stainless steel wire is about 2mm; and sizing agent is injected after the process of plugging up the hole and inserting the wire are ready, and the case making is continued after the sizing agent is solidified. The invention has the advantages that a mold core die is independently manufactured, the period is short, and the cost is low; in addition, the method is not limited by the sorts of the dies and is especially suitable for small amount of products or a single product, and the application is flexible.

Description

technical field [0001] The invention relates to a shell-making method of a silica sol investment casting, in particular to a shell-making method of a silica sol investment casting with a slender pore structure. 1. Background technology: [0002] 1. Investment casting is also called lost wax casting. This method is to make the fusible material into a precise and smooth shape (fusible mold), coat the fusible mold with multiple layers of refractory materials, and the refractory materials will form a mold after hardening. The fusible mold in the mold is melted and flowed out, and then the molten metal is poured into the baked mold, and the molten metal becomes a precise and smooth casting after cooling and solidifying in the mold. Investment casting is the highest precision among the existing casting methods. Compared with the traditional sand casting method, its characteristics are as follows: [0003] ①. Use fusible molds to shape, no need to take molds out of the box; [0...

AI Technical Summary

Problems solved by technology

[0016] 1. It is necessary to make molds separately to produce ceramic cores. The cycle is long, the cost is high, and special equipment is required. It is produced by professional manufacturers and is only suitable for large-scale products;

[0017] 2. Most precision casting companies are order-to-order production, with small batches. Customers often provide wax models or wax injection molds. Once the wax model has a slender hole structure, the silica sol shell cannot be completed, and the new core mold will be cycled. Too long, production is extremely inflexible

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