CN1041715A

CN1041715A - Insulation subsidy and process for steel castings

Info

Publication number: CN1041715A
Application number: CN 88105138
Authority: CN
Inventors: 李春盛; 李格利; 韩育成; 陈昕
Original assignee: SHENYANG RESEARCH INST OF CAST
Current assignee: SHENYANG RESEARCH INST OF CAST
Priority date: 1988-10-11
Filing date: 1988-10-11
Publication date: 1990-05-02
Also published as: CN1013745B

Abstract

The invention relates to a steel casting heat preservation patching material, which consists of quartz sand, organic and inorganic fibers, a resin curing agent and a certain proportion of water, and the manufacturing process comprises the following steps: adding water into organic fiber to make pulp, adding inorganic fiber and quartz sand, stirring, filtering, drying the mixture, grinding the mixture with water, resin and curing agent to obtain the heat-insulating material, forming by core-making method, and drying the heat-insulating patching product at 160-180 deg.C to raise strength so as to obtain the invented heat-insulating patching material for steel casting.

Description

Steel-casting insulation subsidy and technology

Steel-casting insulation subsidy of the present invention belongs to cast steel technology material.

In Steel Castings,, cause the steel-casting consecutive solidification to guarantee the feeding effect in order to improve casting process yield.It is that the technology of setting up at corresponding each position is on demand subsidized to realize the good result of feeding that the present invention is incubated subsidy, guarantees casting quality, and the material of subsidy is a core of the present invention.

The background technology of invention is: English, day two countries begin the research with heating or the subsidy of insulation subsidy substituted metal in recent years, but the heating subsidy is difficult to be widely used in production because of the prescription of its complexity, expensive price, and heating wherein becomes branch that foundry goods is polluted.The insulation subsidy of steel-casting requires very strict to insulation material, except that satisfying requirements such as refractoriness and thermal conductivity factor, high temperature normal temperature strength, stable physics and chemical property also to be arranged to guarantee foundry goods inside and surface quality, though the research of insulation subsidy is at home and abroad arranged, does not have the precedent of success to be seen in document.

The present invention provides the excellent insulating material for insulation subsidy technology, have advantages such as thermal conductivity is low, refractoriness is high, volume stability is good and chemical property and stablize, do not pollute foundry goods, this material substituted metal subsidy can be avoided the heavy cleaning and the processing of metal subsidy, realizes that in casting mold the directed consecutive solidification of foundry goods provides condition.

1964 to 1987 international monopolies obtain 76 pieces in relevant document by retrieval, consult the not technology identical of result with the present invention, with the immediate prior art of the present invention be: BP, patent No. GB2063126 promotes the subsidy of directional solidification by granular and fibrous refractory, aluminium oxidant and the binding agent of fluoride are not made in casting mold.The composition of this insulation material is fluoride not, between insulation and heating subsidy, and unit weight 0.3～1。1g/Cm ³, this subsidy is arranged at the position of wishing to produce consecutive solidification on the foundry goods, its cost height, the difficult popularization.

Purpose of the present invention has improved product yield, has shortened the steel-casting machining period with the subsidy of excellent insulating material substituted metal, reduction cast steel industry raw material and energy resource consumption.

Content of the present invention:

1, material weight ratio of the present invention is: quartz sand 80～85%, organic fiber 5～7%, inorfil 8～12%, more than three kinds of compositions account for 100%, add 4～5% heavy phenolic resins of material, 0.3～0.8% methenamine (curing agent) adds the water that accounts for material gross weight 45～50% then.

2, moulding process of the present invention

Under the normal temperature in beater, earlier with organic fiber and water slurrying, after again inorfil quartz sand being added stirring, filtration compound is dried, on mulling is ground, add water, phenolic resins, urotropine firming agent again and grind and make molding material, with core-making method system type, subsidy goods through 160 ℃～180 ℃ oven dry.

The main physical and chemical performance of material of the present invention sees Table 1.

The present invention subsidizes the advantage that material is compared with prior art had: 1. the present invention makes the application of this technology and popularization that prerequisite is provided for insulation subsidy technology provides the excellent insulating material; 2. this insulation material has advantages such as thermal conductivity is low, refractoriness is high, volume stability is good, and chemical property stable, do not pollute foundry goods, can guarantee bright and clean cast(ing) surface.

The present invention subsidizes the influence of material to surface quality of continuous castings, and material at high temperature lower volume stability, chooses several typical materials, has carried out performance comparison.

Comparing result such as table 2.

Heat insulating material fire resistance of the present invention and high temperature lower volume stability excellence.

3, embodiment

Waste paper with 7%, 10% alumina silicate fibre, 83% quartz sand are basic material.

At normal temperatures, to account for basic material earlier and heavily be 7% waste paper throws in the beater, add entry and make form slurry, the slurry of making is inserted in the mixer, add respectively simultaneously that to account for basic material ratio be that 10% aluminosilicate refractory fiber and 83% the common quartz sand of 100～200 orders fully stir, refractory fibre is carefully beaten and is discharging after the graininess, drainage in the slurry to be mixed, and the drainage material is made the subsidy material in 100 ℃～120 ℃ drying and dewaterings.

Above-mentioned subsidy material is dropped in the kolleroang, adding accounts for material and weighs 5% dried the mixing 2～3 minutes of 8-1 type phenolic resins, add 0.3～0.8% the methenamine aqueous solution more respectively and account for total material and weigh 47% water, wet mixing went out to grind in 10～15 minutes, it is erose as quill shaft casting parts thermal insulation subsidy goods to have produced camber or other with common core-making method, 170 ℃ of oven dry down, intensity rises with these goods, and kiln discharge is stand-by.

When preparation quill shaft core, the heat insulating products of three uniform arcs is put into core, coremaking is lowered in the type with core.

Fig. 1 is the quill shaft casting structure schematic diagram that adopts insulation subsidy technology.

Fig. 2 is the cutaway view of Fig. 1 along the A-A line.

Table 1

Goods unit weight (g/cm³)	Thermal conductivity factor (1000 ℃ time) (KCL/m.h. ℃)	High-temperature body shrinks (1400 ℃) (%)	Refractoriness (℃)	The temperature air permeability	Temperature and pressure intensity (MPa)
						0.9～1.05	0.16	＜5	1670～ 1690	10～15	0.05～ 0.07

Rupture strength (MPa)

Dry-pressing intensity (MPa)

Moisture content of finished products (%)

SiO ₂

AL ₂O ₃

CaO

Fe ₂O ₃

MgO

TiO

K ₂O

Na ₂O

＞1

＞2

＜1

84.32

5.64

0.05

0.32

0.22

0.16

0.25

0.26

Claims

1. An insulation subsidy for steel castings, which is characterized in that: the materials used are: 80-85% of quartz sand, 5-7% of organic fiber, 8-12% of inorganic fiber, and the above three components account for 100%. Add 4-5% of the material weight of phenolic resin and 0.3-0.8 of urotropine (curing agent), and then add water accounting for 45-50% of the total material weight.

2. The thermal insulation subsidy according to claim 1, characterized in that: the molding process is to use a beater to first add water to the organic fiber to make pulp at room temperature, then add the inorganic fiber and quartz sand to stir, filter and then dry the mixture. Then add water, phenolic resin, and urotropine curing agent to grind on the sand mixing mill to make thermal insulation materials, use the core making method to shape, and then dry the subsidized products at 160 ° C to 180 ° C.