Preparation method of ceramic shell for eliminating thermal joints of conjoined blades

Abstract

The invention discloses a method for preparing a ceramic shell for eliminating heat joints of a conjoined blade body, comprising the following steps: S1: making a wax model module of a conjoined blade; S2: making a ceramic shell of a conjoined blade module: S21: Clean the combined blade wax mold module; S22: Use the dipping method to make the ceramic shell, dip the cleaned combined blade module in the ceramic slurry, and put the combined blade mold coated with the ceramic slurry The group is covered with a sand layer in the sand shower, and then dried to form a layer of ceramic shell; S23: repeat S22 several times, that is, repeat the manufacturing operation of several layers of ceramic shells; S24: in the process of step S23, in the blade Disappearing layers are set in the gaps between the ceramic shells of the modules, thereby ensuring the strength of the ceramic shells at the back of the blade and the leaf pot, and eliminating the generation of thermal joints between the conjoined blades; S25: the finished product in S24 On the basis of ceramic slurry sealing, the final ceramic shell is formed.

Description

technical field [0001] The invention relates to the field of ceramic mold shell preparation, in particular to a ceramic mold shell preparation method for eliminating the thermal joint of the blade body of a conjoined blade. Background technique [0002] Aero-engine turbine blades and gas turbine blades are manufactured by precision casting. At present, precision casting mainly refers to lost wax precision casting. The main process includes: pressing the blade and pouring the wax mold of the gating system, forming a wax tree according to the process requirements of the blade and gating system; The preparation of the shell is mainly carried out by the method of dipping and pouring sand, that is, the surface of the wax tree is evenly wrapped with a layer of ceramic slurry and then sprayed with sand, so that the slurry layer is completely and evenly covered with a layer of sand of refractory material. After drying for a period of time, The slurry and the refractory sand constit...

AI Technical Summary

Problems solved by technology

For the guide vanes, conjoined casting is generally used in order to improve production efficiency. However, due to the gaps between the conjoined vanes, it is easy to cause sand accumulation when preparing the mold shell with slurry and sand, and it is easy to use the ceramic shell after a certain number of layers. The mold shells between the conjoined blades are connected together, and finally form a heat joint such as Figure 4 The hot joint 8 in the middle is easy to cause loose defects on the blade body

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