CN101032727A

CN101032727A - Hot pressure blowing method of forming metal bottle

Info

Publication number: CN101032727A
Application number: CNA2006100243969A
Authority: CN
Inventors: 谢靖佳
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-06
Filing date: 2006-03-06
Publication date: 2007-09-12

Abstract

The hot pressing and blowing process for forming metal bottle is to form metal bottle with high pressure inside a closed mold on the principle that at high temperature, metal material has lowered yield stress and raised plasticity. The forming machine consists of mold seat, side molds, bottom mold, pressure conducting duct and heater. The hot pressing and blowing process for forming metal bottle includes: fixing the bottle blank inside the mold cavity with sealed pressure conducting duct; heating the bottle blank with the heater to the forming temperature and intruding pressure gas into the bottle blank for the bottle blank to be formed into the required shape. The process of the present invention is suitable for forming various kinds of metal containers, including complicated ones, and the formed metal container has homogeneous wall thickness and smooth transition.

Description

Hot pressure blowing method of forming metal bottle

Affiliated technical field

Hot pressure blowing method of forming metal bottle is a kind of forming metal containers method.It utilizes metal material at high temperature, and yield stress reduces, and plasticity strengthens principle, adopts high pressure to make heating of metal bottle base one-time formed technology in closed mould.This invention is guaranteed the metal bottle base under suitable temperature and pressure, and moulding smoothly prevents bottle explosion.Formed canister can be widely used in civilian and industrial packagings such as beverage, drinks, cosmetics.Have withstand voltage, resistance to compression, the easy characteristics of recycling.

Background technology

The manufacturing of double-disk canister (container and container cover) at present mainly is to adopt stamping forming technology, and formed container is limited to columned external form, profile single (as pop can), and external form is upgraded complex process.

Summary of the invention

The present invention adopts new hot pressing bottle blowing technology, can produce the canister of different shape complexity, and makes the canister of non-cylinder external form become possibility, as square or erose metal bottle.

The technical solution adopted in the present invention is: utilize metal material at high temperature, yield stress reduces, and plasticity strengthens principle, adopts high pressure to make heating of metal bottle base one-time formed technology in closed mould.Make-up machine is made up of mould seat, left and right sides side form, bed die, catheter pressure and heater.Before the moulding, bottle base is fixed in left and right sides side form and the formed cavity of bed die, and airtight by catheter pressure institute.After heater added thermic moulding requirement temperature with bottle base, pressed gas entered bottle base by conduit, makes bottle base be subjected to compression swelling, formed required form.During moulding, cavity body of mould keep-ups pressure, and makes bottle base form back pressure, to prevent the bottle base explosion.Chamber pressure should be less than briquetting pressure.Simultaneously, during moulding, conduit should prop up the bottle base bottom, prevents the bottle base bottom because of bottle embryo expansion lifting, loses with bed die to contact and bottle explosion.After the metal bottle moulding, left and right sides side form separates, to take out shaped bottle.

Description of drawings

Below in conjunction with drawings and embodiments process structure of the present invention and technical process are further detailed.

Fig. 1 is process structure figure

Fig. 2 is the shape of bottle base

Fig. 3 is technology cutaway view (an A-A cutaway view)

Fig. 4 is bottle base pressurized expansion plans (a B-B cutaway view)

Fig. 5 is bottle base expansion expander graphs (a B-B cutaway view)

Fig. 6 is bottle base expansion expansion bottom detail figure

Fig. 7 is the last moulding figure of bottle base

Among Fig. 1 to Fig. 7, the 1st, side form; The 2nd, bottle base; The 3rd, bed die; The 4th, the mould seat; The 5th, catheter pressure; The 6th, heating is held in both hands.

The specific embodiment

1. process structure

The process structure figure of hot pressure blowing method of forming metal bottle as shown in Figure 1, it is made up of mould seat, left and right sides side form, bed die, catheter pressure and heater.

1) bottle base

Bottle base is to form the preceding semifinished product of canister, and it can form by traditional punching press drawing process.The length of bottle base should quite or slightly be grown with the length of container, and its diameter is to determine according to the container final form.Bottle base is the bottle base of necking down (as Fig. 2) normally.

2) side form (left and right sides side form) and bed die

Side form and bed die are used for forming the cavity of sealing, the net shape of its shape decision canister.The cavity of sealing is divided into left and right sides side form and bed die is to be convenient to the placement of bottle base and the taking-up of container molding.Between the side form of the left and right sides, alignment pin is arranged all between side form and the bed die, be convenient to lock whole cavity.Can install heating rod additional on side form and the bed die, make mould become pre-hot-die, can be suitable for the heating needs of different metal bottle bases.

3) mould seat

The mould seat is the basis that various moulds are installed, it be furnished with pneumatic, surge or the transmission device of machinery, be used to tend to act side form and seat mould deciliter.

4). pressed gas conduit and built-in heating rod

Gas conduit is a device of gases at high pressure being introduced bottle base, and it makes the inner high pressure that forms sealing of bottle base, and forces the bottle base expansion molding, and gas conduit has other binomial critical function simultaneously concurrently.

A) conduit is subjected to pneumatic or the transmission of surging forms downward precompression, and the sealing bottle base makes to form closed cavity in the bottle base, helps forming high pressure.

B) when the metal bottle moulding, the conduit bottom props up the bottle base bottom all the time, contacts all the time with bed die to keep the bottle base bottom, prevents bottle explosion.If there is not conduit, bottle base forms lifting because lateral expansion is out of shape, and loses with bed die to contact, and in the final stage of container formation, forms bottle explosion.

Inbuilt heating rod heating bottle blank rapidly is convenient to the bottle base moulding to form certain thermograde.

2. hot pressure blowing method of forming metal bottle technical process

The hot pressure blowing method of forming metal bottle technical process mainly comprises: the removal of the residual stress of bottle base and preheating, bottle base adds cavity body of mould, the bottle base moulding and the demoulding.

1) removal of the residual stress of bottle base and preheating

Bottle base must be removed residual stress before moulding, can make metal obtain maximum plastic deformation like this, was convenient to the moulding of bottle base.The preheating of bottle base has two kinds of methods usually, and a kind of is the outer preheating of cavity, forms certain temperature and thermograde, enters die for molding then.Another kind is to heat in the cavity, reaches certain forming temperature and thermograde extrusion forming afterwards.

The temperature of bottle base and the size of thermograde are the materials by container, what shape determined.Forming the different temperatures gradient on bottle base is in order to control the position of bottle base pressurization back initial bubble, to be beneficial to control the shape of container.Because the position that the bottle base temperature is high, yield stress is low, will expand at first after pressurization.

2) bottle base adds cavity body of mould

Heated/not heated bottle base (inner heating) places on the bed die, and left and right sides side form closes up, and the bed die lifting forms an airtight cavity (as Fig. 3).Then, catheter pressure gos deep into bottle base, produces downward precompressed, and sealing bottle base mouth also produces downward precompressed, be convenient to pressure-loaded (if the cavity heating, the side form of heating rod and preheating and bed die be heating bottle blank, make it reach forming temperature after, reload moulding).

3) bottle base moulding

Heated bottle base has bigger plasticity.Gases at high pressure enter the heating bottle blank of sealing by gas conduit, will force bottle base outwards expand (as Fig. 3).Therebetween, the process of moulding can be divided into three steps:

A) bottle base is subjected to compression swelling

Cause bottle explosion in order to prevent that original upload pressure is excessive, initial pressure should linearly increase.When moulding pressure P 1 reaches material yield stress, will force the high position of bottle base temperature outwards to be expanded.When moulding pressure P 1 linear the loading, cavity body of mould pressure P 2 also loads simultaneously simultaneously, and chamber pressure P2 imports cavity by the pressure port on the bed die.The effect of chamber pressure is that bottle base is formed back pressure, prevents the excessive and bottle explosion of briquetting pressure P1.In forming process, chamber pressure P2 should be less than briquetting pressure P1.(as shown in Figure 3, Figure 4)

B) briquetting pressure raises to expand and expands

Along with the rising of briquetting pressure P1, the expansion of bottle base will be expanded.Cause lifting bottom the bottle base for the expansion that prevents bottle base, lose with bed die and contact caused bottle explosion, gas conduit should prop up the bottle base bottom all the time, makes the bottle base bottom keep contacting with bed die.So also be beneficial to and form uniform wall thickness.(as Fig. 5, shown in Figure 6)

C) last moulding

In the final stage of bottle base moulding, pressure can strengthen suddenly, forms the bottom of container.(as shown in Figure 7)

4) demoulding

Bottle base after the moulding (container), by release, the conduit lifting, left and right sides mould separates and takes out container, and the container after the moulding is a high temperature, can be cooled to normal temperature by air-cooled or air cooling.

3. the characteristics of hot pressure blowing method of forming metal bottle

1) because side form and bed die determine the final form of bottle base, and side form and bed die can be the combinations of Any shape, so final container can be any complicated shape.

2) Bian Xing the limit is by metal material, forming temperature, briquetting pressure and time common decision.

3) container molding is integral type, can be used for various civilian and industrial use, pressure vessel or vessels not under pressures.

4) technical process is simple, is convenient to large-scale production.

5) can the tiny feature of moulding, as effects such as embossments.

Claims

1. hot pressure blowing method of forming metal bottle is a kind of forming metal containers method.It utilizes metal material at high temperature, and yield stress reduces, and plasticity strengthens principle, adopts high pressure to make heating of metal bottle base one-time formed technology in closed mould.Make-up machine is made up of mould seat, left and right sides side form, bed die, catheter pressure and heater.Before the moulding, bottle base is fixed in left and right sides side form and the formed cavity of bed die, and airtight by catheter pressure institute.After heater added thermic moulding requirement temperature with bottle base, pressed gas entered bottle base by conduit, makes bottle base be subjected to compression swelling, formed required form.During moulding, cavity body of mould keep-ups pressure, and makes bottle base form back pressure, to prevent the bottle base explosion.Chamber pressure should be less than briquetting pressure.During moulding, conduit props up the bottle base bottom, prevents the bottle base bottom because of bottle base expansion lifting, loses with bed die to contact and bottle explosion.

Hot pressure blowing method of forming metal bottle is to be applicable to that the metal bottle base blows under certain temperature and pressure condition and form the process of integral type canister.

2. during the metal bottle blank molding, cavity body of mould need keep certain pressure, makes the outside back pressure that forms of bottle base, and back pressure must be less than the bottle base briquetting pressure, when being used to prevent that bottle base from expanding rapidly, and the bottle explosion phenomenon that forms.Cavity back pressure and bottle base briquetting pressure are controlled by pressure regulator.

3. before the metal bottle blank molding, catheter pressure must form precompressed downwards, props up the bottle base bottom, and the bottom lifting that causes when preventing that bottle base from expanding loses and contacts with bed die and form bottle explosion.