CN1994617B - Process for making iron inner container of electric cooker - Google Patents

Abstract

The invention relates to a method for producing the container of iron electric cooker, wherein said method comprises that: mounting the container mould between convex mould and concave mould; forming some space between mould and convex mould, mould and concave mould; filling shell coated sand into the space; heating and solidifying the shell coated sand, separating concave and convex moulds, taking out the mould; filling fused iron into concave mould; matching the convex and concave moulds; when the iron is solidified, separating concave and convex moulds, taking out the container. The invention uses iron as material with low cost. And the mould can be used repeated. The inventive container has high thermal resistance and thermal insulation.

Description

A kind of manufacture craft of iron inner container of electric cooker

Technical field

The present invention relates to a kind of casting technique of metalwork.Especially a kind of manufacture craft of iron inner container of electric cooker.

Background technology

At present, the liner material of electric cooker adopts aluminium alloy or stainless steel more.Simple, low weight, good heat conductivity of aluminum alloy casting technique and cost are lower comparatively speaking, therefore as the main material of inner container of electric cooker.But there is certain shortcoming in aluminium alloy, because good heat conductivity, therefore rapid heat dissipation when electric cooker is incubated needs constantly heating to keep insulation, the waste electric energy.Simultaneously, the heat resistance of aluminium alloy is relatively poor, and when temperature is higher than 250 ℃, distortion will appear in inner bag, has influenced the use of electric cooker.For stainless inner container of electric cooker, can adopt sand casting and die cast to obtain, but the sand casting mould makes trouble, can not reuse, and castability is relatively poor; The cost of die cast is too high, and the while is difficult to promote the use of owing to the stainless steel material cost is higher.

Summary of the invention

The object of the present invention is to provide a kind of manufacture craft of iron inner container of electric cooker, technical process is simple, with low cost, and the properties of product that obtained are superior, meets energy-conservation requirement.

The present invention realizes above-mentioned purpose like this:

A kind of manufacture craft of iron inner container of electric cooker is characterized in that may further comprise the steps:

1) model identical with inner container of electric cooker is assemblied between punch and the die, between model and punch, model and die, forms certain space, inject precoated sand toward the space;

2) punch and the die be coated with the overlay film layer of sand respectively separated in precoated sand is heating and curing back, takes out model;

3) molten iron with fusion injects the die inside that is coated with the overlay film layer of sand, then punch is cooperated with die, treats to separate punch and die behind the molten steel solidification, takes out inner container of electric cooker.

The invention has the beneficial effects as follows: adopt cheap irony as raw material, and improve the shortcoming of original sand casting and die cast, the slim cast member of irony that adopts this method to obtain, technology is simple, mould can reuse, with low cost, and iron inner container of electric cooker is because hear resistance height, the good heat insulating of cast iron make product reach good energy-saving effect in insulating process.

The specific embodiment

Because electric cooker adopts aluminium alloy or stainless steel inner container to have certain shortcoming more at present.Advantage with reference to the cast iron iron pan: homogeneous heating, hear resistance height and good heat insulating, and also cheap, therefore consider to use cast iron to make inner container of electric cooker.Existing comparatively general casting technique has sand casting and die cast.Wherein the mould of sand casting makes trouble, can not reuse, and castability is relatively poor; The cost of die cast is too high, therefore all is difficult to satisfy inner container of electric cooker and makes requirement.The invention provides a kind of manufacture craft of iron inner container of electric cooker, its step is as follows:

1) model identical with inner container of electric cooker is assemblied between punch and the die, between model and punch, model and die, forms certain space, inject precoated sand toward the space;

2) punch and the die be coated with the overlay film layer of sand respectively separated in precoated sand is heating and curing back, takes out model;

3) molten iron with fusion injects the die inside that is coated with the overlay film layer of sand, then punch is cooperated with die, treats to separate punch and die behind the molten steel solidification, takes out inner container of electric cooker.

Described molten iron is the foundry iron of fusion, and the mass percent of its component is: iron 94%～98%, carbon 2%～4%, silicon 1.25%-3.6%, manganese 0.4%～2%, sulphur＜0.1%, phosphorus 0.01%～0.2%.It more than is the main technique of iron inner container of electric cooker, more coarse and the ferrous material of the product appearance that is obtained gets rusty easily, therefore also to carry out post processing,, mainly comprise operations such as cleaning precoated sand, polishing and enamel processing to satisfy the needs that use to its surface.The cleaning precoated sand is that the precoated sand that utilizes pressure-air will stick to the inner bag surface is disposed, and sandblasts then and is polished in the surface.Because iron is exposed to and is easy to occur corrosion in the environment, therefore carry out enamel at last and handle.When the polishing that can also take other and etch-proof technology are carried out surface treatment to iron inner container of electric cooker.

The present invention adopts cheap irony as raw material, and improve the shortcoming of original sand casting and die cast, the slim cast member of irony that adopts this method to obtain, technology is simple, mould can reuse, with low cost, and iron inner container of electric cooker is because hear resistance height, the good heat insulating of cast iron make product reach good energy-saving effect in insulating process.

Claims (2)

1. the manufacture craft of an iron inner container of electric cooker is characterized in that may further comprise the steps:

1) model identical with inner container of electric cooker is assemblied between punch and the die, between model and punch, model and die, forms certain space, inject precoated sand toward the space;

2) punch and the die be coated with the overlay film layer of sand respectively separated in precoated sand is heating and curing back, takes out model;

3) molten iron with fusion injects the die inside that is coated with the overlay film layer of sand, then punch is cooperated with die, treats to separate punch and die behind the molten steel solidification, takes out inner container of electric cooker.

2. the manufacture craft of a kind of iron inner container of electric cooker according to claim 1 is characterized in that postprocessing working procedures in addition, comprises cleaning precoated sand, polishing and enamel processing.