Precision casting gating system

Abstract

The invention discloses a precision casting gating system. The precision casting gating system mainly comprises a pouring cup, a gate sprue, a cross gate and an inner runner, wherein the gate sprue is connected with the pouring cup and arranged below the pouring cup; the cross gate comprises an upper cross gate and a lower cross gate; the upper cross gate and the lower cross gate are respectively arranged above and below the gate sprue; the inner runner comprises an upper inner runner and a lower inner runner; the upper inner runner is arranged below the upper cross gate; the lower inner runner is arranged above the lower cross gate; a reduced section is arranged on the gate sprue. By providing the reduced section on the gate sprue of the composite gating system, and adjusting the ratio of the upper and lower cross gates and the inner runners of the gating system, shunting of alloy liquid in the pouring process is achieved. The height of the reduced section on the gate sprue is adjusted, so as to achieve precision control of the meeting interface position of the alloy liquid. The set preferential solidification part is preferentially solidified, so that metallurgical defects such as looseness and cold shut at the position are avoided, and the qualified rate of casting is improved.

Description

technical field [0001] The invention belongs to the technical field of secret casting, and in particular relates to a pouring system for precision casting. Background technique [0002] For castings with long and narrow blades and thin walls, metallurgical defects such as cold shut, porosity, and inclusions are likely to appear in the middle of the blade when the equiaxed crystal casting process is adopted, mainly because the parts prone to metallurgical defects in the middle of the blade cannot be solidified first , the surrounding alloy forms an effective feed to the parts prone to metallurgical defects. However, the gating system currently in use cannot satisfy the condition that the middle part of the blade solidifies first. [0003] Traditional investment casting gating systems are mainly top pouring and bottom pouring. With this gating system, after pouring, the low temperature parts are respectively located in the lower and upper parts of the casting. For castings w...

AI Technical Summary

Problems solved by technology

For castings with narrow, long and thin-walled blade body parts, neither of these two gating systems can effectively control the metallurgical defects of the castings.

However, the composite gating system cannot control the diversion of the molten metal during the upper and lower punching process and the height of the meeting surface of the molten metal according to the needs of the casting.

As a result, the diversion of the alloy liquid during the punching process and the height of the meeting surface are extremely arbitrary, and it is impossible to effectively control the parts that produce metallurgical defects during the casting process.

At the same time, the traditional composite gating system cannot avoid the phenomenon that the alloy liquid preferentially enters the bottom and the low injection type dominates. The alloy liquid washes the shell seriously, and the alloy liquid passing through the upper and lower runners meets the interface in the casting. Unstable, it is difficult to achieve precise control of the preferential solidification part of the casting, and the pass rate of the casting is low

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