CN1579676A - Hollow ball plug and its manufacturing method - Google Patents

Abstract

The invention provides a hollow bulb stopper and its manufacturing method. The hollow bulb stopper is hollow globose plug. We pour the melted metal liquid into the on-the-fly clip mould made up of two parts, upper and lower. There is die cavity with the shape of the bulb stopper and sand core whose shape is same with the hollow shape of the bulb stopper. The sand core has a central channels and the metal liquid is poured into through the central channel and penetrates the interval channel at the bottom of the sand core to make the metal liquid distribute equably in the clearance between the die cavity and the sand core. Till it is cool, we stop circumgyrating the mould, demolds it, mash the sand core and get the bulb stopper. The invention can effectively simplify the technique of the thin wall bulb stopper and provides bulb stoppers with higher quality.

Description

Hollow ball plug and manufacture method thereof

Technical field

The present invention relates to a kind of bulb stopper and casting method thereof, relate in particular to a kind of hollow ball plug and manufacture method thereof.

Background technology

The bulb stopper that general known centre spinning method manufactures, with the molten metal perfusion in rotation at a high speed, by in the clamp-on mould dimerous up and down, the die cavity that has the bulb stopper shape in this mould, treat its cooling, mould stops the rotation, the capable again demoulding, promptly make bulb stopper, though yet this bulb stopper centre has columniform through hole, beyond this bulb stopper through hole part be all solidly, required metal material amount is big, cost thereby higher, because this bulb stopper inside is the abundant heart, overall weight is heavy again, is difficult for carrying, carrying capacity is also quite limited, when using in the valve body of packing into, the flexibility ratio of rotation is also not good, remains to be improved.Other has Announcement Number to be: 457347, name is called: the patent of hollow ball plug and manufacture method thereof, it is that mat is provided with the upper mould cave that is the hourglass shape in mold, make the top of sand core can penetrate top in this mold, sand core partly is up and down and the tight embedding mutually of mould up and down, do not interspace, and needing setting sand to make sand core form the suspention shape fixes, the corresponding sand core of following die cavity that cooperates bed die again, and with the mold closing, in the formation, bed die and core room are formed with the die cavity of a preformed bulb stopper, and the mode that cooperates centrifugal casting, casting is the bulb stopper that is hollow shape, and makes this technology can significantly reduce the material cost of making bulb stopper, reduces the weight and the convenient carrying of bulb stopper.

But, this Announcement Number is: 457347, name is called: the patent of hollow ball plug and manufacture method thereof, on implementing, real process still has many difficulties place: because the top of sand core is piercing in the upper mould cave hourglass shape portion of mold, to fill fixing with setting sand, just can make sand core form the suspention shape is fixed in the upper mould cave of mold, not only waste of manpower and time, to proofread and correct the uniformity in sand core and upper mould cave gap with instrument earlier, after correction finishes, also need the auxiliary of measurer to hold sand core, fill fixing again with setting sand from the bottom of sand core, though setting sand has fixing fast effect, but this is to belong to false fixing, and is not very firm, also is not just can fix fast within several seconds, must wait for to bone dry, just can produce false fixing effect; Again because sand core is the object that gravity is arranged, under the effect of high speed rotating centrifugal, and under the false not firm fixation, sand core often has the generation of sagging and eccentric phenomena, cause the gap of sand core and upper and lower die cavity can't uniformity, make in rotational forming just uncontrollable on the bulb stopper inner thickness, the bulb stopper that manufacturing is come out, very big otherness is arranged on thickness certainly, make the quality rather unstable.

Summary of the invention

In view of this, main purpose of the present invention provides a kind of hollow ball plug and manufacture method thereof, overcomes existing technology and makes hollow shape bulb stopper Heavy Weight, and cost is higher, and difference in thickness is big, the instability quality shortcoming.

The object of the present invention is achieved like this:

A kind of hollow ball plug is the hollow ball shape stopper, is molten metal to be poured into close in the folder formula mould; Be provided with the die cavity of described bulb stopper shape in this mould, and the sand core consistent with this bulb stopper hollow shape, described sand core has centre gangway, and described molten metal is to pour into from this centre gangway, and see through the runner of sand core bottom, this metal liquid stream is distributed in the gap of die cavity and sand core makes.

A kind of manufacture method of hollow ball plug, with the molten metal perfusion in rotation at a high speed, by dimerous closing in the folder formula mould up and down, be preset with the die cavity of made bulb stopper shape in this mould, and the sand core consistent with this bulb stopper hollow shape, sand core has centre gangway, described molten metal is to pour into from this centre gangway, and see through the runner of sand core bottom, this molten metal is evenly spread in the gap of die cavity and sand core, treated its cooling, mould stops the rotation, the capable again demoulding, and smash sand core to pieces, and promptly make bulb stopper, thoroughly solve above-mentioned defective of the prior art.

Wherein manufacture process specifically comprises following step:

Get the raw materials ready: metal material is heated to is fused into liquid state;

Set firmly bed die: default its following die cavity is the bed die of bulb stopper Lower Half shape, this bed die is pinned be fixed in the centrifugal casting machine;

Put sand core: default its is shaped as the sand core of bulb stopper hollow shape, and this sand core Lower Half places in the following die cavity of bed die, maintains default gap between sand core and the following die cavity, the thickness of this gap decision institute moulding bulb stopper inside; This sand core is provided with central passage;

Cover mold: default its upper mould cave is the mold of bulb stopper first half shape, the upper mould cave of this mold is towards sand core, cover on bed die, this sand core first half places in the upper mould cave of mold, make equally and maintain default gap between sand core and the upper mould cave, the thickness of this gap decision institute moulding bulb stopper inside is when pinning clamping with upper and lower mould, can be fixed in core clamper in the upper and lower die cavity, the top of described sand core is the place, sprue gate that tight phase build-in fixes on mold; Again the housing box of centrifugal casting machine is covered;

Start centrifugal casting machine: will be installed with two centrifugal casting machines that close the upper and lower mould of folder formula and be started, and make this two close the upper and lower mold high speed rotation of folder formula;

Perfusion: will calculate an amount of molten metal liquid in advance, and, pour into the centre gangway of sand core that upper and lower die cavity is put in rotating at a high speed, the upper and lower mould of two clamp-ons from the sprue gate of centrifugal casting machine top;

Rotating centrifugal moulding: because of the upper and lower mold high speed rotation of two clamp-ons produces centrifugal force, utilize this principle, make molten metal liquid in the sand core centre gangway, see through the runner of sand core bottom, evenly spread in the gap of upper and lower die cavity and sand core;

Finish the bulb stopper foundry goods: after the rotating centrifugal forming process, molten metal cooled off a period of time after, bulb stopper moulding in the clearance space between sand core and the upper and lower die cavity;

Open mold: stop the centrifugal casting machine rotation, open the set housing box of centrifugal casting machine; But described housing box is provided with the protecting cover of flip-up style; Dig on the described protecting cover and be provided with water bucket; Be provided with centrifugal turntable in the described housing box; Described mould promptly is fixed on the centrifugal turntable, produces centrifugal force by motor and the described centrifugal turntable of main shaft drives and mould rotation.

Take out foundry goods: the bulb stopper and the sand core that take out moulding;

Smash sand core to pieces: sand core is smashed to pieces, obtained the finished product bulb stopper.

The present invention has the following advantages:

Its technology with well-designed simplification can produce the bulb stopper with thin-walled hollow shape, and not only weight saving more significantly reduces material, reduces cost, and can make the bulb stopper material more accurate, and quality is more superior.

Description of drawings

Fig. 1 is a casting method flow chart of the present invention

Fig. 2 is upper and lower mould of the present invention and sand core exploded perspective view

Fig. 3 is upper and lower mould of the present invention, sand core and centrifugal casting machine combined planar cutaway view

Fig. 4 is sand core of the present invention and foundry goods section plan

Fig. 5 is a foundry goods section plan of the present invention

Fig. 6 is the structural representation between housing box of the present invention and the centrifugal casting machine

The drawing reference numeral explanation:

10 bed dies, 12 molds

14 sand cores, 16 bulb stoppers

20 times die cavitys of 18 centrifugal casting machines

22 upper mould caves, 24 housing boxs

26 sprue gates, 28 centre gangwaies

30 runners, 40 supports

42 main shafts, 44 motors

46 protecting covers, 48 centrifugal turntables

The specific embodiment

For more detailed clear and definite understanding being arranged, lift the present invention's one preferred embodiment now and cooperate graphic being described as follows the technology on purpose of the present invention and the method, means:

Seeing also shown in Figure 1ly, is a kind of asymmetric vertical centrifugal casting method flow diagram of the present invention, and cooperates and consult Fig. 2, Fig. 3, Fig. 4 and Fig. 5, shown in Figure 6, and its whole manufacturing process includes following each step:

Get the raw materials ready: metal material is heated to is fused into liquid state;

Set firmly bed die: default its following die cavity 20 is the bed die 10 of bulb stopper Lower Half shape, this bed die 10 is pinned be fixed in the centrifugal casting machine 18;

Put sand core: default its sand core 14 that is shaped as the bulb stopper hollow shape and central passage is arranged, these sand core 14 Lower Halves are placed in the following die cavity 20 of bed die 10, maintain default gap between sand core 14 and the following die cavity 20, the thickness of these gap decision institute moulding bulb stopper 16 inside;

Cover mold: the mold 12 that is preset with upper mould cave 22 bulb stopper first half shapes, the upper mould cave 22 of this mold 12 is towards sand core 14, cover on bed die 10, these sand core 14 first halves are placed in the upper mould cave 22 of mold 12, make equally between sand core 14 and the upper mould cave 22 and maintain default gap, the thickness of these gap decision institute moulding bulb stopper 16 inside, when two upper and lower moulds 10,12 are pinned clamping, can be clamped on sand core 14 in the upper and lower die cavity 20,22, again the housing box 24 of 18 of centrifugal casting machines be covered; Start centrifugal casting machine: the centrifugal casting machine 18 that will be installed with the upper and lower mould 10,12 of two clamp-ons is started, and makes the rotation at a high speed of the upper and lower mould 10,12 of this two clamp-on;

Perfusion: will calculate an amount of molten metal liquid in advance, and, pour into 20,22 centre gangwaies 28 of putting sand core 14 of upper and lower die cavity in rotating at a high speed, the upper and lower mould 10,12 of two clamp-ons from the sprue gate 26 of centrifugal casting machine 18 tops;

The top of described sand core is the place, sprue gate that tight phase build-in fixes on mold;

But described housing box 24 is provided with the protecting cover 46 of flip-up style; Dig on the described protecting cover 46 and be provided with water bucket; Be provided with centrifugal turntable 48 in the described housing box 24; Described mould 10,12 promptly is fixed on the centrifugal turntable, produces centrifugal force by motor 44 and the described centrifugal turntable of main shaft drives and mould rotation.

Rotating centrifugal moulding: produce centrifugal force because of the upper and lower mould 10,12 of two clamp-ons rotates at a high speed, utilize its principle, make molten metal liquid in sand core 14 centre gangwaies 28, see through the runner 30 of sand core 14 bottoms, allow molten metal evenly spread in the gap of upper and lower die cavity 20,22 and sand core 14;

Finish the bulb stopper foundry goods: the rotating centrifugal forming process, afterwards molten metal is cooled off a period of time after, the clearance space between sand core 14 and the upper and lower die cavity 20,22 forms bulb stopper 16;

Open mold: stop centrifugal casting machine 18 rotations, open centrifugal casting machine 18 housing boxs 24 and mold 12;

Take out foundry goods: the bulb stopper 16 and the sand core 14 that take out moulding again;

Smash sand core to pieces: because institute's bulb stopper of finishing 16 is metal material, hardness is higher, and sand core 14 is smashed to pieces, can obtain bulb stopper 16;

Such scheme can effectively solve Announcement Number and is by this: 457347, and name is called: the shortcoming of the patent of hollow ball plug and manufacture method thereof, and have following advantage:

Manufacture process of the present invention, sand core directly just can place the following die cavity of bed die, again the upper mould cave of mold towards sand core, cover on bed die, on two, when bed die pins clamping, can be fixed in core clamper, in the following die cavity, need not any instrumental correction gap wherein, also need not auxiliary the fixing of setting sand that reach of special tool(s), reach fixing fast action, because down, the shape and the gap thereof of upper mould cave and sand core preset, and add that sand core is fixed fast really, both made under the effect of high speed rotating centrifugal, sand core never is offset, and keeps sand core with following, the uniformity in upper mould cave gap makes the due thickness of the inner formation of bulb stopper in rotational forming, to the bulb stopper that manufacturing is come out, considerably stable on quality.

Claims (3)

1, a kind of hollow ball plug is the hollow ball shape stopper, is molten metal to be poured into close in the folder formula mould; Be provided with the die cavity of described bulb stopper shape in this mould, and the sand core consistent with this bulb stopper hollow shape, described sand core has centre gangway, and described molten metal is to pour into from this centre gangway, and see through the runner of sand core bottom, this metal liquid stream is distributed in the gap of die cavity and sand core makes.

2, a kind of hollow ball plug manufacture method, with the molten metal perfusion in rotation at a high speed, by dimerous closing in the folder formula mould up and down, be preset with the die cavity of made bulb stopper shape in this mould, and the sand core consistent with this bulb stopper hollow shape, sand core has centre gangway, described molten metal is to pour into from this centre gangway, and see through the runner of sand core bottom, this molten metal is evenly spread in the gap of die cavity and sand core, treat its cooling, mould stops the rotation, the capable again demoulding, and smash sand core to pieces, promptly make bulb stopper.

3, as a kind of hollow ball plug manufacture method as described in the claim 2, wherein manufacture process includes:

Get the raw materials ready: metal material is heated to is fused into liquid state;

Set firmly bed die: default its die cavity is the bed die of bulb stopper Lower Half shape, this bed die is pinned be fixed in the centrifugal casting machine;

Put sand core: default its sand core that is shaped as the bulb stopper hollow shape and central passage is arranged, this sand core Lower Half places in the following die cavity of bed die, keeps default gap between sand core and the following die cavity, the thickness of this gap decision institute moulding bulb stopper inside;

Cover mold: default its die cavity is the mold of bulb stopper first half shape, the upper mould cave of this mold is towards sand core, cover on bed die, this sand core first half places in the upper mould cave of mold, make equally and maintain default gap between sand core and the upper mould cave, the thickness of this gap decision institute moulding bulb stopper inside is when pinning clamping with two upper and lower moulds, can be fixed in core clamper in the upper and lower die cavity, again the centrifugal casting machine housing box be covered;

Start centrifugal casting machine: will be installed with the centrifugal casting machine that closes the upper and lower mould of folder formula and be started, and make this mold high speed rotation;

Perfusion: will calculate an amount of molten metal liquid in advance, and, pour into the centre gangway of the sand core of putting in the upper and lower die cavity of the upper and lower mould of the folder formula of closing in rotation at a high speed from the sprue gate of centrifugal casting machine top;

Rotating centrifugal moulding: produce centrifugal force because of closing the upper and lower mold high speed rotation of folder formula, make molten metal liquid in the sand core centre gangway, see through the runner of sand core bottom, allow molten metal evenly spread in the gap of upper and lower die cavity and sand core;

Finish the bulb stopper foundry goods: after the rotating centrifugal forming process, molten metal is cooled off a period of time, the bulb stopper moulding of sand core and upper and lower die cavity clearance space;

Open mold: stop the centrifugal casting machine rotation, open centrifugal casting machine housing box and mold;

Take out foundry goods: the bulb stopper and the sand core that take out moulding;

Smash sand core to pieces: sand core is smashed to pieces, obtained bulb stopper.

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