Sand mould casting technology using filter screens instead of washburn cores

A technology of sand casting and filter screen, which is applied in the removal of sand casting risers and in the field of sand casting technology. It can solve the problems of time-consuming removal of risers, high labor intensity, and low production efficiency, so as to increase market share and reduce labor intensity. , The effect of reducing the scrap rate

Inactive Publication Date: 2016-06-08
LUOYANG ZHILI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In an embodiment of the present invention, a sand casting process in which a filter screen is used instead of an easy-to-cut sheet comprises the following steps:

[0020] Step 1. Make the upper mold and the lower mold of the hammerhead sand mold, and reserve the position of the ingate.

[0021] Step 2: Install a filter screen between the riser and the hammer head pattern, and integrate the filter screen with the hammer head shape; install a filter screen on the sprue at a position close to the sprue cup. Wherein, the filter screen is obtained by weaving glass filaments into a square mesh with a hole diameter of 3 mm, coating with high-temperature resistant ceramic slurry, and sintering at high temperature. The filter screen fixed between the riser and the shape of the hammer has the effect of controlling the height of the stub of the riser, and the height of the stub of the riser can be controlled to 1-2 mm.

[0022] Step 3, paint the upper and lower molds of the hamme...

Embodiment 2

[0026] In an embodiment of the present invention, a sand casting process in which a filter screen is used instead of an easy-to-cut sheet comprises the following steps:

[0027] Step 1. Make the upper mold and the lower mold of the hammerhead sand mold, and reserve the position of the ingate.

[0028] Step 2: Install a filter screen between the riser and the hammer head pattern, and integrate the filter screen with the hammer head shape; install a filter screen on the sprue at a position close to the sprue cup. Wherein, the filter screen is obtained by weaving glass filaments into a square mesh with a pore diameter of 5 mm, coating with high-temperature resistant ceramic slurry, and sintering at high temperature. The filter screen fixed between the riser and the shape of the hammer has the effect of controlling the height of the stub of the riser, and the height of the stub of the riser is 2-3mm.

[0029] Step 3, paint the upper mold and the lower mold of the hammerhead sand ...

Embodiment 3

[0033] In an embodiment of the present invention, a sand casting process in which a filter screen is used instead of an easy-to-cut sheet comprises the following steps:

[0034] Step 1. Make the upper mold and the lower mold of the hammerhead sand mold, and reserve the position of the ingate.

[0035] Step 2: Install a filter screen between the riser and the hammer head pattern, and integrate the filter screen with the hammer head shape; install a filter screen on the sprue at a position close to the sprue cup. Wherein, the filter screen is obtained by weaving glass filaments into a square grid with a hole diameter of 8 mm, coating with high-temperature resistant ceramic slurry, and sintering at high temperature. The filter screen fixed between the riser and the shape of the hammer has the effect of controlling the height of the stub of the riser, and the height of the stub of the riser is 3-4mm.

[0036] Step 3, paint the upper mold and the lower mold of the hammerhead sand ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08B22C9/02B22C9/22
CPCB22C9/086B22C9/02B22C9/22
Inventor 王大伟张祖临潘二焕王伟超
Owner LUOYANG ZHILI NEW MATERIALS CO LTD
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