CN109203183B

CN109203183B - Isostatic pressing method and mould for ceramic pot liner

Info

Publication number: CN109203183B
Application number: CN201710542404.7A
Authority: CN
Inventors: 刘光海
Original assignee: Enping Fuen Machinery Manufacturing Co ltd
Current assignee: Guangdong Maichi Machinery Co.,Ltd.
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2021-03-19
Anticipated expiration: 2037-06-30
Also published as: CN109203183A

Abstract

A ceramic pot container isostatic pressing forming method and mould, fill ceramic powder material that granulate into isostatic pressing ceramic pot container mould, the mould core of the pot container mould is a metal hard mould, its shape and size are identical with shape and size of the internal surface of the pot container base; the outer mold of the pot liner mold is a rubber or polyurethane flexible film, a cavity filled with ceramic powder is reserved between the outer mold and the mold core, and the size of the space of the cavity is scaled according to the compression ratio of the ceramic powder. And rubber or polyurethane bottom moulds are arranged on the upper parts of the mould core and the outer mould, ceramic powder with required weight is added into the mould cavity, the powder is scraped, the bottom mould is covered, the powder is sent into an isostatic chamber for pressurization, the mould is taken out after pressure maintaining and pressure relief, the rubber mould is taken out, and the formed ceramic pot liner blank can be taken out.

Description

Isostatic pressing method and mould for ceramic pot liner

Technical Field

The invention relates to an isostatic pressing forming method and a die for producing a ceramic pot liner, which are particularly suitable for producing high-performance stoneware pot liners and can be widely used in occasions with high requirements on the size of the pot liners, such as electric rice cookers, electric soup cookers and the like.

Background

At present, the known production method of the ceramic pot liner adopts wet forming: the ceramic pot liner blank is obtained by performing wet ball milling, filter pressing, pug ageing, vacuum pugging, roll forming, blank trimming and drying on ceramic raw materials prepared according to different formulas, or the ceramic pot liner blank is formed by adopting a wet ball milling-grouting method.

The pot liner blank formed by the existing method has high water content, strong blank and low density, large blank drying occupation area and low production efficiency, or special drying lines are needed, the transfer and drying shrinkage are easy to deform, the blank size is difficult to control, so that the product size is inconsistent, the qualification rate is low, and the large-scale production of high-quality pot liners is not facilitated.

Disclosure of Invention

In order to overcome the defects of the existing forming method and improve the product quality and the production efficiency, the invention provides a method for forming a ceramic pot liner by isostatic pressing. Compared with the ceramic pot liners formed by the existing various methods, the ceramic pot liners produced by the method have the advantages that the formed green bodies are high in density, good in density and size uniformity, low in moisture and free of deformation, special drying is not needed, the production efficiency is high, automatic production is easy to achieve, and the requirements of high-quality mass production can be met.

The technical solution adopted by the invention is as follows: filling the granulated ceramic powder into a cavity of a boiler liner mold by using an isostatic press, wherein a mold core of the boiler liner mold is a metal hard mold, and the shape and the size of the mold core are consistent with those of the inner surface of the boiler liner; the outer mold of the pot liner mold is a rubber or polyurethane flexible film, a cavity filled with ceramic powder is reserved between the outer mold and the mold core, and the size of the space of the cavity is scaled according to the thickness of a ceramic pot liner blank and the compression ratio of the ceramic powder. The upper parts of the metal mold core and the rubber outer mold are bottom molds made of rubber or polyurethane, ceramic powder with required weight is added into a mold cavity of the mold, the powder on the upper part is scraped off, the bottom mold is covered, the ceramic powder is sent into an isostatic chamber or an isostatic pressure working cylinder for isostatic pressure, the whole mold is taken out after pressurization, pressure maintaining and pressure relief, and the formed ceramic pot liner blank can be taken out after the rubber mold is taken out.

The invention has the effect that the ceramic dry powder can be directly subjected to isostatic pressing under high pressure or even ultra-high pressure, so that the internal density is uniform and consistent. Because the dry powder is used for isostatic pressing forming, the moisture content is low, the density and the strength of the blank are high, the blank is not deformed, the drying shrinkage is avoided, the sintering shrinkage is reduced, the product deformation is small, the size consistency is good, and the production efficiency and the product percent of pass are greatly improved.

The blank formed by the method is subjected to blank trimming, glazing, drying, firing and bottom grinding to obtain a finished product pot liner, and the finished product pot liner can be widely used in matching with electric rice cookers and electric soup cookers.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of a dry bag isostatic press formed ceramic pot liner of the present invention.

FIG. 2 is a schematic view of an isostatic pressing ceramic pot liner mold according to the invention.

In the figure, 1, an isostatic pressing container, 2, an isostatic pressing working medium, 3, an isostatic pressing isolation rubber liner, 4, a rubber or polyurethane bottom die, 5, a rubber or polyurethane outer die, 6, ceramic powder, 7, a metal die core, 8, a lower plug head of a dry bag isostatic pressing machine, 9, a die core positioning step, 10, an outer die positioning step, 11, a hollow die core, 12, an outer die charging hole and 13, an external pressurizer are arranged.

Detailed description of the preferred embodiments

In the isostatic pressing ceramic pot container mold shown in fig. 2, the rubber or polyurethane outer mold 5 is tightly sleeved on the positioning step 10 of the metal mold core 7, and the middle part of the metal mold core 7 is hollowed out to form a mold core hollow 11 for reducing the weight of the metal mold core 7, but the middle part of the metal mold core may not be hollowed out to be solid. Taking the rubber or polyurethane bottom die 4 open, adding the granulated ceramic powder 6 into a gap between the rubber or polyurethane outer die 5 and the metal die core 7, namely a die cavity, from the outer die feed opening 12, scraping the ceramic powder 6 on the upper part, plugging the outer die feed opening 12 with the rubber or polyurethane bottom die 4, and completing the filling. The isostatic pressing ceramic pot container forming die filled with the materials can be pressed and formed in a dry bag isostatic pressing machine and can also be pressed and formed in a traditional wet bag isostatic pressing machine.

As shown in figure 1, the ceramic pot liner isostatic compaction mould which is filled, namely the assembly of 4, 5, 6 and 7, is integrally translated and placed on a lower plug head 8 of the dry bag isostatic compaction machine and is matched with a mould core positioning step 9 for positioning. The isostatic pressing lower plug head of the dry bag is integrally connected with an isostatic pressing forming die and integrally rises to extend into an isostatic pressing chamber of a dry bag isostatic pressing machine, an isostatic pressing isolation rubber liner 3 is arranged around and at the top of the isostatic pressing chamber, the isostatic pressing isolation rubber liner 3 is made of rubber or polyurethane, an isostatic pressing medium 2 is arranged outside the isostatic pressing isolation rubber liner, and the pressing medium can be hydraulic oil or antirust water. In the high pressure cylinder of the isostatic pressure container 1 and the external pressure booster 13, the external pressure booster 13 continuously injects the pressure medium 2 into the isostatic pressure container 1, the pressure medium 2 is pressurized by the external pressure booster 13 according to the Pascal's law, the pressure intensity is constantly transmitted to all directions, the pressure intensity of the pressurizing medium 2 acts on the isostatic pressing isolation rubber liner 3, the isostatic pressing isolation rubber liner 3 transmits the pressure intensity of the pressurizing medium 2 to the rubber or polyurethane bottom mold 4 and the rubber or polyurethane outer mold 5 inside the isostatic pressing isolation rubber liner, similarly, as the rubber or polyurethane is similar to fluid under the pressure effect, the rubber or polyurethane bottom mold 4 and the rubber or polyurethane outer mold 5 transmit the pressure intensity applied on the pressurizing medium 2 to the surface of the ceramic powder 6, so that the ceramic powder 6 is compressed on the outer surface of the metal mold core 7 under uniform pressure intensity, and the size and the shape of the outer surface of the metal mold core 7 are consistent with the size and the shape of the inner surface of the ceramic pot liner blank to be pressed.

After the isostatic pressing forming die for the ceramic pot container with the finished filler, namely the assembly of 4, 5, 6 and 7, is pressurized, pressure-maintaining and pressure-relieving, the cylinder is opened, the die assembly pressed by isostatic pressing is taken out, the rubber or polyurethane bottom die 4 and the rubber or polyurethane outer die 5 are taken out, the ceramic pot container blank body is seen to be attached to the outer surface of the metal die core 7, the pressed ceramic pot container blank body is taken out, and the required ceramic pot container is obtained after blank trimming, glazing and firing.

The ceramic pot container isostatic compaction mould for completing the packing, namely the assembly of 4, 5, 6 and 7, can also be integrally placed in a single or a plurality of working cylinders of a wet cold isostatic press in the traditional sense for compaction.

Claims

1. A ceramic pot container isostatic pressing method, which is to put granulated ceramic dry powder into an isostatic pressing ceramic pot container mould, put the whole body of the loaded isostatic pressing ceramic pot container mould assembly into a container of an isostatic pressing machine to pressurize, maintain pressure and release pressure, then take out the assembly, and release the mould to obtain a ceramic pot container blank body, and is characterized in that: the ceramic pot liner is formed by granulating ceramic dry powder through an isostatic pressing method;

the shape and the size of the outer surface of the metal mold core are consistent with the shape and the size of the surface of the pot liner blank to be formed; the outer mold is made of rubber or polyurethane material; the bottom die is made of rubber or polyurethane material;

tightly sleeving a rubber or polyurethane outer mold at a positioning step of a metal mold core, taking away a rubber or polyurethane bottom mold, adding granulated ceramic powder into a gap between the rubber or polyurethane outer mold and the metal mold core, namely a cavity, from an outer mold feeding opening, scraping the ceramic powder on the upper part, plugging the outer mold feeding opening with the rubber or polyurethane bottom mold, and completing filling;

integrally translating the ceramic pot liner isostatic pressing forming die subjected to filling onto a lower plug head of a dry bag isostatic pressing machine, and positioning by matching with a die core positioning step; the isostatic pressing lower plug of the dry bag is connected with an isostatic pressing forming die and integrally rises to extend into an isostatic pressing chamber of a dry bag isostatic pressing machine, an isostatic pressing isolation rubber bladder is arranged at the periphery and the top of the isostatic pressing chamber, the isostatic pressing isolation rubber bladder is made of rubber or polyurethane, an isostatic pressing medium is arranged outside the isostatic pressing isolation rubber bladder, the pressurizing medium is filled into the isostatic pressing container and a high-pressure cylinder of an external pressurizer continuously by the external pressurizer, the pressurizing medium is pressurized by the external pressurizer according to the Pascal law, the pressure intensity of the pressurizing medium is constantly transmitted to all directions, the pressurizing medium applies the pressure intensity to the isostatic pressing isolation rubber bladder, the isostatic pressing isolation rubber bladder transmits the pressure intensity of the pressurizing medium to a rubber or polyurethane bottom die and a rubber or polyurethane outer die inside the isostatic pressing isolation bladder, and the rubber or polyurethane is similar to fluid under the pressure effect, the rubber or polyurethane bottom mold and the rubber or polyurethane outer mold transmit the pressure on the pressurizing medium to the surface of the ceramic powder, so that the ceramic powder is compressed on the outer surface of the metal mold core under uniform pressure,

after the isostatic pressing forming die for the ceramic pot liner with the finished filler is pressurized, pressure-maintaining and pressure-relieving, the die assembly pressed by isostatic pressing is taken out by opening the cylinder, the rubber or polyurethane bottom die and the rubber or polyurethane outer die are taken out, the ceramic pot liner blank body is seen to be attached to the outer surface of the metal die core, the pressed ceramic pot liner blank body is taken out, and the required ceramic pot liner is obtained by trimming, glazing and firing.

2. The isostatic pressing method of ceramic pot bladder as claimed in claim 1, wherein: the isostatic pressing process may be performed in either a dry bag isostatic press or a wet bag isostatic press.