Investment casting mold shell dewaxing device and investment casting mold shell dewaxing method

Abstract

The invention relates to an investment casting mold shell dewaxing device and an investment casting mold shell dewaxing method. The investment casting mold shell dewaxing device comprises a trolley furnace and a dewaxing plate, a dewaxing opening is formed in the outer surface of the trolley furnace, the dewaxing plate is obliquely placed in the trolley furnace, and one end, relatively low relative to the height of the bottom of the trolley furnace, of the dewaxing plate is extended out from the dewaxing opening. The investment casting mold shell dewaxing method comprises the following steps that an investment casting mold shell is obliquely placed in the trolley furnace, and heating is carried out through the trolley furnace; and the temperature in the trolley furnace is adjusted according to the observation of the wax outlet flow of the dewaxing opening, so that burning flames are prevented from occurring, and after dewaxing is completed, the mold shell is cooled to reach the room temperature and then is taken out. By adopting the technical scheme, the dewaxing process of the mold shell can be observed conveniently, the heating temperature can be adjusted conveniently, and the burning flames can be effectively prevented from occurring, so that wax attached to the surface of the investment casting mold shell is thoroughly removed, the damage to the trolley furnace is avoided,and the service life of the trolley furnace is prolonged.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an investment casting mold shell dewaxing device and an investment casting mold shell dewaxing method. Background technique [0002] Casting molding is an important process method of mechanical manufacturing and processing at present. Metal materials are generally used to make molds, and then casting raw materials are poured into the mold. Then, after the poured raw materials are cooled and solidified, the finished castings can be taken out of the mold cavity. With the development of the economy, people have more and more requirements for manufactured products. For some castings with special shapes, it is usually necessary to use fusible materials to make mold shells, and then pour the casting raw materials to convert the soluble mold shells into mold shells. The material is melted to make a casting product with a complex curved surface shape. The mold s...

AI Technical Summary

Problems solved by technology

[0002] Casting molding is an important process method of mechanical manufacturing and processing at present. Metal materials are generally used to make molds, and then casting raw materials are poured into the mold. Then, after the poured raw materials are cooled and solidified, the finished castings can be taken out of the mold cavity. With the development of the economy, people have more and more requirements for manufactured products. For some castings with special shapes, it is usually necessary to use fusible materials to make mold shells, and then pour the casting raw materials to convert the soluble mold shells into mold shells. The material is melted to make a casting product with a complex curved surface shape. The mold shell can be used many times. However, when the mold shell is reused, more fusible substances, such as wax, are easy to adhere to the outer surface of the mold shell. To ensure When the mold shell is used for pouring, the dimensional accuracy of the casting must be removed. The wax attached to the outer surface of the mold shell must be removed. In the prior art, heating is generally used to remove it. Generally, the mold shell is placed in a trolley furnace for smoldering. The method in the existing technology has the following defects. One is that the furnace door is tightly closed, and it is impossible to observe during the wax discharge process. Often because the temperature rises too fast, the surface wax has not been completely discharged, and the internal wax has melted, resulting in mold. The large area of ​​the shell swells and cracks, which leads to serious inclusions in the later pouring castings, especially the hollow castings of the support plate, which often cause fires inside the support plate because they cannot be inspected and repaired; and the mold shell at the repaired part is thicker, resulting in uneven thickness of the mold shell, which affects Consistent shrinkage and normal heat dissipation of castings are prone to deformation and loose defects; and the released wax cannot be discharged, and the wax is burned in the furnace, which greatly damages the inner wall of the trolley furnace, and part of the liquid wax penetrates into the electric furnace wire and burns. damage, which affects the performance of the trolley furnace

Images