Out-of-Mold Core Casting Method for Inclined Column Castings

Abstract

The invention relates to an external multiple-core casting method. A complex sand core structure of the inner cavity of a casting is divided into a supporting sand core 1#, a sand core 2#, a sand core 3#, a sand core 4# and a sand core 5#; a sand core screw rod and a sand core assembling hole are reserved when the sand core is manufactured, the supporting sand core 1# is used as a supporting sand core, the sand core 2# and the sand core 3# are assembled on the supporting sand core in advance and are locked and located by the supporting sand core, the sand core 4# and the sand core 5# are assembled outside the mold cavity, the sand core structure assembled of the supporting sand core 1#, the sand core 2# and the sand core 3# is assembled on a sand core outer mold, and then the sand core structure assembled of the sand core 4# and the sand core 5# is assembled on the sand core outer mold. Due to the above design, the size accumulation error and mutual interference error of the sand cores caused when the sand cores are assembled in sequence can be avoided, the casting size precision is improved, the shaking or floating phenomenon of the sand cores under the actions of impulsion force and the floating force of molten iron is avoided, and situations of dislocation of the vent holes of the sand cores and boiling are prevented.

Description

technical field [0001] The invention relates to a core assembly method in sand casting, in particular to an out-of-mold core assembly casting method for oblique column type castings. Background technique [0002] In resin sand molding casting, the positioning of the core head is used to combine the cores, the cores are used to form cavities between the sand cores, and the molten iron is injected into the cavity to form a casting. [0003] In the casting process of inclined column castings, the inner cavity structure is mainly composed of 1# supporting sand core, 2# sand core, 3# sand core, 4# sand core and 5# sand core. The core assembly method for producing this casting in the industry Generally, the core is assembled in the core, that is, the sand cores are assembled in the order of 4# sand core-5# sand core-2# sand core-3# sand core-1# support sand core in the cavity, and the Place the core support in between. However, with this sand core assembly method, when the size ...

AI Technical Summary

Problems solved by technology

However, with this sand core assembly method, when the size of the casting sand core is very large, especially when the height of the 4# and 5# sand cores is relatively large, during pouring, under the impact of high-temperature molten iron, on the one hand, due to the sand core Unstable positioning of the head may cause shaking. On the other hand, if the positioning of the core support is unstable or the strength is too low, the 4# and 5# sand cores will shake, resulting in the deviation of the inner cavity size of the casting or the failure of the air hole seal of the core head. The gas generated in the process cannot be discharged from the gas outlet of the top box, resulting in defects such as size deviation, choking, and pores in the casting.

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