CN1757464A

CN1757464A - Method for quick changing bottom inlet of intermediate ladle

Info

Publication number: CN1757464A
Application number: CN 200510012874
Authority: CN
Inventors: 翟立猛
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-09-30
Filing date: 2005-09-30
Publication date: 2006-04-12
Anticipated expiration: 2025-09-30
Also published as: CN1311941C

Abstract

A technology for quickly exchanging the bottom sprue of tundish includes such steps as proportionally mixing the raw materials, putting an iron shell in the die of press, pouring the mixture of raw materials in it, pressing by at least 130 t, and roasting at least 300 deg.C for more than 10 hr. Its advantages are short production period and high quality and long service life of product.

Description

A kind of manufacture craft of tundish quick-replaceable sewage outlet

Technical field

The present invention relates to a kind of slide gate nozzle that fused mass is used of casting, specifically a kind of manufacture craft of tundish quick-replaceable sewage outlet.

Background technology

In the production process of conticaster casting steel billet, need to use a kind of tundish that holds molten steel, the bottom of tundish is equipped with one for the filling pipe end that waters under the molten steel, carries the quick-replaceable sewage outlet (hereinafter to be referred as " the following mouth of a river ") of a plurality of arrangements on the guide rail on the conticaster.The first mouth of a river down is pushed into the below relative with tundish upper nozzle by hydraulic push rod along guide rail, and molten steel releases from the filling pipe end interstitial hole of tundish, passes down the interstitial hole on the mouth of a river, injects underlying die, is cast into various forms of steel billets.Instantly after the interstitial hole on the mouth of a river is arrived to a certain degree by the high-temperature molten steel corrode, the quality of the influence steel billet of casting " wire drawing " phenomenon can appear.Promote the next mouth of a river down by hydraulic push rod this moment under the workman operates control, the original following mouth of a river is ejected, and the new following mouth of a river is relative with tundish upper nozzle, thereby under the condition of uninterrupted molten steel direct casting, has realized the quick replacing at time mouth of a river.Because the mouth of a river is to adopt this mode of operation to realize changing fast down, so people also just are referred to as " quick-replaceable sewage outlet " with this mouth of a river down.By above-mentioned service condition as seen, the concentricity problem of the interstitial hole on the tundish upper nozzle and the following mouth of a river is directly to determine a following mouth of a river key factor in service life.

The structure of this quick-replaceable sewage outlet, be to be that cylinder, top are in the iron-clad of square box shaped a body material that profile is identical to be housed a bottom, the body material is to make with refractory material, and the centre has the centre bore of a perforation, and the suitable for reading of centre bore is the taper enlarging.Its manufacture craft is: at first, with the raw material for refractory mixing preparation of system body material, after compression molding, put into oven, baking typing at least 48 hours under 500 ℃ of temperature; On the body material of typing, smear the fire clay of bonding usefulness, put into iron-clad then and locate; Put into oven at last, baking both can make body material and iron-clad be fixed together more than 15 hours under 300 ℃ of temperature, became finished product.

This deficiency of mouth of a river manufacture craft down, the one, the body material need be by fire clay and iron-clad cemented in place.Owing between body material and iron-clad, be provided with the slit of the 2-5mm that is used to smear fire clay, and by wet in the bake process of doing, fire clay can produce creep, makes the body material produce certain skew in iron-clad, causes the location of body material to be forbidden.The 2nd, bonding process is to be finished by workman's manual operations.And the craft of body material in housing is accurately located, and is a very difficult job, different operators and same operator's each bonding operation, all very difficult accurate location that guarantees the body material.But the accuracy of the central hole location uniformity of centre bore concentricity (be called not only) but also be to guarantee that can the made mouth of a river down become the critical index of qualified finished product.So the manual positioning action of body material in iron-clad, not only accuracy is not high, and labour intensity is big.Owing to there are above-mentioned 2 deficiencies, cause the following mouth of a river finished product error of existing explained hereafter only can be controlled in the 3mm, and, can't repair finished product because of fire clay hardness after baking is very big, so cause two big major defects of existing production technology: dimensional tolerance is big, the percent defective height.

Summary of the invention

Purpose of the present invention just provides the tundish quick-replaceable sewage outlet manufacture craft that a kind of production technology is simple, dimensional tolerance is little, to improve the yield rate and the service life at the mouth of a river down, reduces the continuous casting production cost of iron and steel enterprise.

The present invention is achieved in that

The manufacturing process steps of tundish quick-replaceable sewage outlet is: a, mixing preparation are made the raw material of body material; B, iron-clad is placed in the mould of forcing press, the step is mixed confected materials in the injection, pressurization typing under at least 130 tons of pressure; C, will go up step typing product and insert in the oven, under at least 300 ℃ of temperature, toast more than 10 hours, be finished product.

In process of the present invention, the moulding pressure of forcing press less than 130 tons pressure, then can not make the body material obtain the hardness of original baking typing at least more than 130 tons, also just can not exempt corresponding body material baking shaping process.Through repetition test, typing pressure is advisable with the 130-160 ton.Under this pressure, both can guarantee the typing hardness of body material, also can make itself and iron-clad realize closely knit the combination simultaneously, reached and used the bonding effect of fire clay (its mechanism of action awaits further research and inquires into).Owing to do not use fire clay bonding in the technology of the present invention, thereby the stoving time of last typing product can suitably be shortened.When being baked to 10 hours, its finished product can reach the instructions for use of iron and steel enterprise.Through repetition test, stoving time is in 10-12 hour scope, and the body material performance in the made mouth of a river finished product down all can satisfy the use needs.

Process of the present invention, behind the raw material that injects refractory material in iron-clad, in the typing of once pressurizeing of forcing press inner high voltage, the nothing baking that has realized moulding, the body material of body material is finalized the design and the body material combines once finishing of three step process with iron-clad.Its distinguishing feature: one is the unification of three steps, has simplified manufacture craft.The 2nd, the machine inner high voltage is once finalized the design, and has exempted the baking shaping process more than 48 hours of original body material, has correspondingly shortened the production cycle.The 3rd, the closely knit combination of a sub-high pressure of body material and iron-clad, operations such as artificial location have been saved with the bonding and body material of fire clay, both reduced labor strength, more crucial is that the margin of tolerance that machine is located can be controlled in the 1mm, the concentricity of final finished is greatly improved, and prolonged service life greatly; And the semi-finished product outward appearance of machine compression set position is regular, good integrity; Simultaneously operating efficiency has also had and has increased substantially.Utilize its product percent of pass of the made quick-replaceable sewage outlet of this process to be close to 100%, the maximum allowance of concentricity only is positive and negative 0.7mm, so its good effect is fairly obvious.

The specific embodiment

Using process of the present invention to make the tundish quick-replaceable sewage outlet, at first is the manufacturing of machine press mould, and this need be according to the corresponding mould of actual size manufacturing at the iron-clad and the following mouth of a river.For iron-clad can be packed in this mould, again can not out-of-size scope and plug material, so the inside dimension of mould should be to be advisable greater than iron-clad overall dimensions 0.2mm.Next is the selection of former, through the repetition test screening, finally determines to select for use 200 tons of hydraulic press, and cylinder pressure is the 40-70 ton under it, and briquetting pressure is the 130-160 ton.

A kind of specific embodiment of the present invention is:

Mixing preparation is made the raw material for refractory of body material well at first, in the usual way.

Then, the pressurization of finalizing the design, its concrete mode is: earlier mould is fixed on the workbench of hydraulic press, after putting into lower cushion block, again iron-clad (outsourcing piece) is put into mould; After confirming that iron-clad puts in place, put core again; And then the raw material for refractory of inciting somebody to action the system body material that mixing preparation is good before this joins (the default part of goods is filled with module) in the iron-clad; After putting upper holder block well, pressurize at last, 150 tons of the upper cylinder half of hydraulic press pressurizations, 50 tons of following cylinder pressurizations press the back with playing cylinder that product is ejected, and are the typing product that body material and iron-clad unite two into one after the form removal.

At last, the product of finalizing the design are inserted in the oven, in 300-320 ℃ of temperature range, toast and be the quick-replaceable sewage outlet finished product in 12 hours.

Claims

1, a kind of manufacture craft of tundish quick-replaceable sewage outlet is characterized in that this processing step is:

A, mixing preparation are made the raw material of body material;

B, iron-clad is placed in the mould of forcing press, the step is mixed confected materials in the injection, pressurization typing under at least 130 tons of pressure;

C, will go up step typing product and insert in the oven, under at least 300 ℃ of temperature, toast more than 10 hours, be finished product.

2, the manufacture craft of tundish quick-replaceable sewage outlet according to claim 1, the stoving time that it is characterized in that the product of finalizing the design is 10-12 hour.