Sand mould casting technology using filter screens instead of washburn cores

Abstract

The invention relates to a sand mould casting technology using filter screens instead of washburn cores. The sand mould casting technology comprises the following steps: manufacturing an upper sand mould and a lower sand mould of a hammer pattern, and reserving an inner gate position; arranging a filter screen between a riser and the hammer pattern and integrating the filter screen and the hammer pattern; arranging a filter screen at a position close to a pouring cup on a sprue; brushing coating on the upper sand mould and the lower sand mould until sand is not exposed; clamping the upper sand mould and the lower sand mould, arranging clips or fully pressing weights, and blocking a parting surface by using a fire-proof mud strip; and adding a pouring system, smelting pouring liquid, and then pouring. By the sand mould casting technology using the filter screens instead of washburn cores, the riser can be removed easily, sometimes, the riser can drop naturally after a box is opened, so that the labor intensity is reduced, the production efficiency is improved, the riser is broken along the filter screens, misrun is avoided, and reject rate is reduced; and by the filter screen placed at a sprue gate, steel slag can be stopped from entering a casting mould cavity, molten steel is purified, and metallurgical quality is improved, so that the performance of castings is improved.

Description

technical field [0001] The invention relates to a method for removing risers of sand castings in the field of casting, in particular to a sand casting process in which filter screens are used instead of easy-to-cut sheets. Background technique [0002] Sand molds are used to produce thick and large castings such as hammerheads, and easy-cut pieces are usually placed at the contact between the riser and the casting. When the diameter of the round hole of the easy-to-cut piece is too small, it is easy to have a reverse pumping phenomenon. When the diameter is too large, it takes time and effort to remove the riser. Lead to scrap castings; low production efficiency and high labor intensity. [0003] In view of the defects in the above-mentioned existing sand casting method for removing the pouring riser, the inventor has accumulated rich production practice experience in foundry design and manufacture for many years, combined with relevant theoretical knowledge research and in...

AI Technical Summary

Problems solved by technology

When the diameter of the round hole of the easy-to-cut piece is too small, it is easy to have a reverse pumping phenomenon. When the diameter is too large, it takes time and effort to remove the riser. Leading to casting scrap; low production efficiency and high labor intensity