Exposed heating type riser tube

Abstract

The invention provides an exposed heating type riser tube. The exposed heating type riser tube comprises a riser tube body, a riser tube head and a heating mechanism; The riser tube body comprises a molten pool inserting section (3) and an air exposing section (2), the tail end of the air exposing section (2) is connected with the riser tube head, a spiral groove (4) is arranged on the outer side of the air exposing section (2), and a plurality of blind holes (9) are formed in the riser tube head. The heating mechanism is divided into two parts. One part of the heating mechanism is uniformly wound on the spiral groove (4) of the riser tube body; and the other part of the heating mechanism is inserted into the built-in blind holes (9) of the riser tube head. The air exposing section of the riser tube is integrally heated through the mode that the riser tube body winds part of the heating mechanism and part of the heating mechanism is inserted into the interior of the riser tube head, and the problem that an exposed conformal riser tube is difficult to heat is solved.

Description

technical field [0001] The invention relates to an exposed heated liquid riser, in particular to an exposed heated liquid riser. Background technique [0002] The riser tube is a commonly used component in low-pressure casting. In traditional low-pressure casting, the riser tube is generally a straight tube. One end is inserted into the alloy molten pool, and the other end is connected to the gate of the mold. Since most of the riser pipes are placed in crucibles or holding furnaces, they are subjected to the thermal action of the alloy molten pool and the heat of the air in the sealed molten pool. Low-pressure casting can be completed by heat action in a closed environment. For some riser pipes with longer geometric dimensions, the temperature at the outlet of the riser pipe is the lowest due to the insignificant heat effect on the end of the riser pipe connected to the mold. In order to avoid the possibility of pipe blockage, it is often necessary to A heating mechanism ...

AI Technical Summary

Problems solved by technology

The heating device mentioned in the above-mentioned patent cannot be well adapted to this kind of follow-up liquid riser that requires heating but has an irregular flow path of molten metal.

Secondly, in the flip casting process, there are stages such as liquid raising, mold filling, pressure maintaining, and pressure releasing molten metal backflow. line temperature, if pouring aluminum alloy, this means that the temperature of the riser pipe needs to be kept above the liquidus line of the aluminum alloy for a long time, generally above 600°C; although the existing patent "a kind of infusion tube" (CN111734912 A), " A conveying pipe for transporting liquid metal medium" (CN 110261567 A) and "Aluminum alloy liquid electric heat transfer pipe" (CN 204879242) mention that the liquid metal conveying pipe can reach a certain temperature by winding heating components, but The premise of these methods is: ① Heating and heat preservation elements need to be installed outside the conveying pipe

②Both ends of the molten metal conveying pipe must be fixed to ensure that it does not deform; in the flipping directional cooling casting process, the head of the rising liquid pipe is required to be inserted into the mold to complete the process flipping action, so that it is impossible to insert the rising liquid pipe into the casting The mold part uses an external heating device; but if the insertion part is not heated, the liquid metal solidification and blockage will easily occur at the head of the riser pipe, which will affect the filling of the mold and the return of the metal liquid; finally, the riser pipe used in this device is exposed to the The part in the air is longer and has a cantilever structure. Under the high temperature of the molten metal and its own gravity, the riser pipe will inevitably be deformed

Once the riser is deformed, the head of the riser will not fit well with the sprue of the mold, resulting in a gap that will cause liquid leakage, resulting in the failure of the riser or the failure of the entire casting process to complete as expected

Images