PEPSET resin moulding and sand cyclic utilization clean casting technology

A casting process and resin sand technology, which is applied in the direction of manufacturing tools, casting molding equipment, cleaning/processing machinery of casting mold materials, etc., to achieve stable chemical properties, realize resource saving and recycling, and reduce pollution.

Active Publication Date: 2014-07-23
LAIZHOU XINZHONGYAO MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]In addition, the existing old sand regeneration system generally adopts the mechanical grinding method, which has the disadvantages of low regeneration efficiency and poor demoulding effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0036] 1000 parts by weight of sand, 5 parts by weight of phenolic resin, 15 parts by weight of polyisocyanate, and 0.3 part of tertiary amine catalyst.

[0037] First add the catalyst to the phenolic resin, then mix it with sand evenly, and finally add polyisocyanate, the total mixing time (the relative error of the sand mixing uniformity of the sand mixer: ±3%) is 50-60 seconds, and the sand mixing After the machine is started and stopped, the sand produced (that is, head sand and tail sand, not exceeding 2kg) cannot participate in molding. After shutdown, there should be no residual sand in the sand mixer that will affect the normal operation.

preparation example 2

[0039] 1000 parts by weight of sand, 8 parts by weight of phenolic resin, 8 parts by weight of polyisocyanate, and 0.3 part of tertiary amine catalyst.

[0040] First add the catalyst to the phenolic resin, then mix it with sand evenly, and finally add polyisocyanate, the total mixing time (the relative error of the sand mixing uniformity of the sand mixer: ±3%) is 50-60 seconds, and the sand mixing After the machine is started and stopped, the sand produced (that is, head sand and tail sand, not exceeding 2kg) cannot participate in molding. After shutdown, there should be no residual sand in the sand mixer that will affect the normal operation.

preparation example 3

[0042] 1000 parts by weight of sand, 10 parts by weight of phenolic resin, 3 parts by weight of polyisocyanate, and 0.05 part of tertiary amine catalyst.

[0043] First add the catalyst to the phenolic resin, then mix it with sand evenly, and finally add polyisocyanate, the total mixing time (the relative error of the sand mixing uniformity of the sand mixer: ±3%) is 50-60 seconds, and the sand mixing After the machine is started and stopped, the sand produced (that is, head sand and tail sand, not exceeding 2kg) cannot participate in molding. After shutdown, there should be no residual sand in the sand mixer that will affect the normal operation.

[0044] Waste sand regeneration treatment method of the present invention comprises the steps:

[0045] 1. Old sand recovery: the old sand and scattered sand are vibrated by the shakeout machine, and the sand blocks that are broken into agglomerates fall into the transition bucket below the shakeout machine, and then are transporte...

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PUM

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Abstract

The invention relates to a PEPSET resin moulding and sand cyclic utilization clean casting technology. The technology comprises the following steps: using raw materials to carry out PEPSET resin sand moulding: putting a sand core into a mould cavity, closing the mould cavity by using an automatic mould closer, then casting with molten iron; shaking out the sands after the moulding of product; transferring the old sands into a waste sand regeneration processing system; wherein the regenerated sands can be applied to a cold box core blower to manufacture sand cores, thus the addition amount of new sands is reduced, and the cyclic utilization of old sands is achieved.

Description

[0001] technical field [0002] The invention relates to a new casting process. The castings of the present invention are mainly used as key components and mechanical foundation castings in the fields of high-speed trains, automobiles, engineering machinery, machine tools, large petrochemical installations, ships, petroleum machinery and rail transit. Background technique [0003] The existing casting process generally adopts furan resin sand molding, because furan resin sand reacts and hardens gradually, when the reaction starts, the sand will be sticky and have poor fluidity. On the other hand, furan resin is more sensitive to ambient temperature. When the temperature is low, the hardening speed will be slow. When the air temperature or sand temperature is too high, the hardening speed will be too fast, and it will be too late to shape. At the same time, furan resin contains sulfur and nitrogen, and the sulfur in it will penetrate into the surface of the casting and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00B22C5/18B22C1/22
Inventor 杨忠耀
Owner LAIZHOU XINZHONGYAO MACHINERY
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