Core molding string casting and vertical casting method for small-size steel casting

Abstract

The invention discloses a core molding string casting and vertical casting method for a small-size steel casting. The core molding string casting and vertical casting method comprises the following steps: (1) designing a casting form to be cast to be left and right parting and arranging in a left template and a right template, wherein each template is provided with a sand box; (2) covering the surface of the form with a layer of facing sands in a shaping process; (3) fully filling floor sand into the left sand box and the right sand box and compacting; (4) hardening foundry sands; (5) taking out a left sand mould and a right sand mould, and manufacturing inner cavity sand cores and a pouring cup; (6) respectively assembling the inner cavity sand cores with the left sand mould and the right sand mould together to form a casting mould, and carrying out convex-concave positioning on the left sand mould and the right sand mould; (7) putting the plurality of casting moulds into a special locking tool to form a string, locking, casting and mounting the pouring cup; and (8) pouring molten steel through the pouring cup, and taking the casting out after cooling and opening the box. Due to the adoption of the core molding string casting and vertical casting method disclosed by the invention, the production efficiency is improved, and the labor intensity and the production cost can be reduced.

Description

technical field [0001] The invention relates to a vertical pouring method for core-assembling molding series casting of small steel castings. Background technique [0002] The wear-resistant castings of tooth sleeves are small steel castings with a unit weight of 1 to 10 kilograms. Most of the existing technologies are produced by precision casting (lost wax method). Although this method has the advantages of high dimensional accuracy and beautiful appearance, it has long production cycle, serious environmental pollution, high cost and high labor intensity. [0003] Precision casting (lost wax method) is to use natural wax or synthetic wax, press it into a casting shape in a mold, and then assemble it into a tree, then immerse the tree in the paint, wet it, hang sand, and immerse it in a curing agent to cure it, and so on. Hang 11~17 layers of sand, the larger the casting, the more layers of sand hanging; after the hanging shell reaches the number of layers required by the ...

AI Technical Summary

Problems solved by technology

This kind of process has many production processes, and the curing agent is generally ammonium chloride. This solution is very volatile ammonia gas, which seriously pollutes the operating environment.

[0004] The existing sand casting generally adopts horizontal parting and pouring, two or four or eight pieces in one box, and has the following disadvantages in the production of small castings: (1) The production efficiency of a single box is low, and each box only has tens of kilograms of castings; (2) Due to the small weight of the casting, the number of pouring times increases, and the pouring time of each ladle of molten steel is too long, resulting in a significant drop in the temperature of the molten steel, which is prone to defects such as cold shut, water marks, and insufficient pouring; (3) More complex molds are required, A large number of sand boxes and sand mold positioning pins and other tooling are invested, and the fixed investment is relatively large; (4) Due to mold assembly errors and large positioning gaps of sand mold positioning pins, the dimensional accuracy of sand mold casting is 2~3 lower than that of precision casting. levels