Isothermal casting wax pneumatic extrusion device

Abstract

The invention discloses a wax pneumatic extruding device for soaking type casting, which comprises a base, a barrel, an upper cover, an air inlet pipe, a guide rod, a piston, a lifting cylinder, a heating mechanism, a discharge pipe, a cooling jacket and a controller , the controller controls the lifting cylinder to push the upper cover up, pulls the piston out under the action of the limit block, and puts the solid wax material into the barrel; when extruding, the controller controls the heating mechanism to work on the material The wax in the barrel is heated, and then, compressed air is pumped into the barrel through the inlet pipe, thereby pushing the piston down to squeeze out the melted wax through the outlet pipe, and at the same time, pump compressed air into the cooling jacket through the inlet joint. Air, thereby cooling the discharge pipe, makes the liquid wax turn into molten wax. The structure of the device is simple, the wax is extruded uniformly and continuously, and at the same time, it is driven by gas, has good protection performance and low maintenance cost.

Description

technical field [0001] The invention relates to a mechanical device, in particular to a wax pneumatic extruding device for homogeneous casting. Background technique [0002] Wax mold precision casting, also known as lost wax casting or investment casting, the specific casting method is: first make a model of the casting to be made with wax material, and weld the model to the sprue rod with the same material to make Dip the module (when the casting is large, it can be a single group), dip the refractory paint (a mixture of water glass or silica sol and fine sand) on the surface of the module, and then sprinkle refractory sand, (dip and sand should be repeated several times , so that the sand layer is thick enough), after it is dry and solidified, heat the mold group, release the wax material from the gate, form an empty shell, roast the empty shell to make it a strong mold shell, and pour the metal liquid from the pouring It is poured into the mouth, and after condensation, ...

AI Technical Summary

Problems solved by technology

When injecting the wax material into the wax mold, the wax material needs to be melted first, and then the wax material is pressed into the wax mold. The existing wax material extrusion method has two types, one is to directly inject the wax material into the wax material. Compressed air is pumped into the barrel to increase the pressure inside the barrel, thereby extruding the wax material. The compressed air can easily enter the wax mold with the wax material, causing bubbles and other defects on the surface of the wax mold. The other is The linear motor drives the piston fixedly connected to the lead screw to extrude the wax. Due to the harsh environment on site and the poor protection performance of the lead screw pair, the service life is low and the maintenance cost is high. At the same time, the wax is directly heated by the heating tube. Due to the small contact area between the heating tube and the wax material, the wax material cannot be melted evenly, and the unmelted wax material will block the discharge pipe, resulting in frequent failures. At the same time, the unmelted wax material enters the wax mold, resulting in low quality wax molds

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