CN102962403B - A kind of process structure for ingate flow field even in upper punch formula running gate system - Google Patents
A kind of process structure for ingate flow field even in upper punch formula running gate system Download PDFInfo
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- CN102962403B CN102962403B CN201210473600.0A CN201210473600A CN102962403B CN 102962403 B CN102962403 B CN 102962403B CN 201210473600 A CN201210473600 A CN 201210473600A CN 102962403 B CN102962403 B CN 102962403B
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Abstract
The invention discloses a kind of process structure for ingate flow field even in upper punch formula running gate system, comprise sprue, cross gate, ingate, casting mold and rising head and be arranged at the equal streambuf between cross gate and ingate, the diameter D3 of this equal streambuf is greater than the diameter D1 of described cross gate, and is more than or equal to the diameter D2 of described ingate.The present invention has cushioned the metal liquid stream entering ingate from cross gate, and the homogenising liquid flowing speed of ingate, liquid stream is made comparatively steadily even to enter casting mold completely reposefully, avoid and to splash and to reduce even to eliminate the spray on molten metal surface convex, thus avoid the casting flaws such as volume gas, oxidation, slag inclusion.The present invention has the advantage that structure is simple, easy to manufacture, be convenient to application.
Description
Technical field
The present invention relates to a kind of system for casting and pouring of optimization, specifically, relate to a kind of process structure for ingate flow field even in upper punch formula running gate system, belong to metallurgical technology field.
Background technology
Upper punch formula running gate system (Uphill Teeming Casting) is the one cast structure of casting production, is mainly used in the production of some bearing steels being difficult to ensure the quality of products and some tool steel.Fill the starting stage of type at this system casting process, molten metal by ingate, will produce serious turbulent flow, injection and splashing with very high speed, thus causes the casting flaws such as volume gas, oxidation, slag inclusion.For overcoming above-mentioned defect, all there is research work to this both at home and abroad.There is the measure of taking its ingate diameter to amplify at home, form unchoked running system, namely be underfill state in sprue always, the object reducing flow velocity, steadily molten metal is reached by reducing static pressure, as " numerical simulation of the cast of brick pore size influences large steel ingot and process of setting at the bottom of mould " (" Special Processes of Metal Castings and the non-ferrous alloy " of Zhong Wenbo, 2010,30,803-805).The shortcoming of the method is that in sprue, metal is always underfill state, and therefore the broken liquid of metal contacts with gas and is easy to be oxidized.In the world, the ingate structure adopting and 25 ° of opening cone angles are set is had, as G.
" Effect of Entrance Nozzle Design on the Fluid Flow in an Ingot Mold during Filling " (" ISIJ International ", 2004,44,1358-1365), this structure has certain effect, but can't meet the demands.Arrange on the basis of cone angle at ingate in addition in the world, add the technical-constructive design of agitation blades further in the import department of ingate, as G.
" A Numeriacl Stduy of Swirl Blade Effects in Uphill Teeming Casting " (" ISIJ International ", 2010,50,1756-1762).The weak point of this structure is the increase in the complexity of frame for movement, and ceramic blade one side is by the impact of high-temperature liquid metal, and one side is constantly impacted by fluid, increases and produces the external probability be mingled with.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of process structure for ingate flow field even in upper punch formula running gate system, under its state be full of at sprue, homogenising is realized to the distribution in the flow field of ingate outlet, thus reduce the trend of molten metal upper punch, reduce the generation of turbulent flow, injection and splashing, to avoid the formation of the casting flaws such as volume gas, oxidation, slag inclusion.
The technical solution used in the present invention is:
A kind of process structure for ingate flow field even in upper punch formula running gate system, comprise sprue, cross gate, ingate, casting mold and rising head, it is characterized in that: described process structure also includes and arranges and the equal streambuf be connected between cross gate and ingate, the diameter D3 of this equal streambuf is greater than the diameter D1 of described cross gate, and is more than or equal to the diameter D2 of described ingate.
The diameter D3 of described equal streambuf equals 2M, and M is the maximum in the diameter D1 of cross gate and the diameter D2 of ingate.
The length L of described equal streambuf is greater than the diameter D2 of ingate, can equal 2 times of the diameter D2 of ingate.
The shaft core position of described ingate meets following condition:
0.5D2＜l＜L﹣0.5D2，
Wherein, l is the distance of the axle center of ingate and the link of equal streambuf and cross gate,
D2 is the diameter of ingate,
L is the length of equal streambuf.
Golden section point near cross gate side on the length L that the shaft core position of described ingate can be positioned at equal streambuf.
Described equal streambuf is coaxial with cross gate.
The present invention is by increasing the equal streambuf arranging an expansion in the junction of cross gate end and ingate entrance, the molten metal of inflow ingate is made not only directly to enter ingate from cross gate, and return again after the end wall of the equal streambuf of the first impact forward of some molten metals and enter ingate, namely, the metal liquid stream flowed from original single direction becomes the metal liquid stream of at least two convection current in the other direction, the flow velocity of the other side has mutually been slackened after two reciprocal metal liquid streams liquidate, and realize homogenising, thus the steady metal liquid stream entering casting mold.
Compared with prior art, the invention has the beneficial effects as follows: the equal streambuf of setting serves current-sharing and cushioning effect to the metal liquid stream in cavity filling process, and the Flow Field Distribution that ingate is exported is more even.When ingate is measure-alike, effect of the present invention is better than the effect of existing process structure ingate mouth size amplified simply far away, and molten metal is full state all the time in sprue, the effect of burning is thus avoided to be better than open system again.Even buffering area of the present invention is combined with the ingate increasing prostomum angle, it is suitable that its effect and ingate increase the structure that prostomum angle and blade use simultaneously, the stirring of blade is also high velocity liquid stream and low speed liquid stream are mixed, but compared with the structure adding blade, the advantage that the present invention gives prominence to is that structure is simple, do not increase any complicated in mechanical structure degree, avoid the blade high-temperature mechanical property hidden danger because increase blade causes simultaneously and produce the problems such as external field trash.
In a word, the present invention serves current-sharing and cushioning effect to the metal liquid stream filled in type, and the Flow Field Distribution making ingate is relatively more even, decreases the generation of turbulent flow, injection and splashing, thus avoiding the casting flaws such as volume gas, oxidation, slag inclusion, the present invention has structure advantage simple, easy to manufacture.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of equal streambuf.
Fig. 3 is when filling type 14% in 40 tons of ingot steel casting systems, the Flow Field Distribution figure of ingate exit cross-section;
Wherein, figure is a) the ingate Flow Field Distribution figure of the embodiment of the present invention one, and this ingate does not arrange cone angle,
Figure b) for having the Flow Field Distribution figure of the existing process structure of 15 ° of upward opening cone angles without equal streambuf, ingate,
Figure is c) without the Flow Field Distribution figure of the existing process structure of cone angle or small-angle without even buffering area, ingate.
Fig. 4 is the flow field figure of embodiment one ingot casting when filling type 17%.
Fig. 5 is in 63.5 tons of ingot steel casting systems, the Flow Field Distribution figure of ingate exit cross-section when filling type 21.4s;
Wherein, figure is a) the Flow Field Distribution figure of the embodiment of the present invention two,
Figure is b) the Flow Field Distribution figure of existing process structure without equal streambuf.
Fig. 6 is the Flow Field Distribution of embodiment three when filling type 21.4s on ingate cross section;
Wherein, figure is a) ingate entrance section, and figure is b) ingate outlet.
Fig. 7 be embodiment three casting mold in liquid level figure;
Wherein, scheming a) is liquid level figure in casting mold when filling type 21.4s, and scheming b) is liquid level figure in casting mold when filling type 64.5s.
In figure, 1 cross gate, 2 ingates, 3 equal streambufs, 4 sprues, 5 casting molds, 6 rising heads,
D1 cross gate diameter, D2 ingate diameter, the equal streambuf diameter of D3, L current-sharing buffer length,
The distance of the axle center of l ingate and the link of equal streambuf and cross gate.
Detailed description of the invention
Incorporated by reference to consulting Fig. 1 and Fig. 2, the process structure that diagram is used for evenly ingate flow field in upper punch formula running gate system comprises sprue 4, cross gate 1, all streambuf 3, ingate 2, casting mold 5 and rising head 6, wherein, vertical sprue 4 is connected with the cross gate 1 of level, equal streambuf 3 arranges and is connected between cross gate 1 and ingate 2, ingate 2 upwards connects the lower end of casting mold 5, and the upper end of this casting mold 5 is connected with rising head 6.
Described equal streambuf 3 is horizontal column type, it is coaxial with cross gate 1, see Fig. 2, equal streambuf 3 diameter D3 is greater than the diameter D1 of described cross gate 1, and is more than or equal to the diameter D2 of described ingate 2, the value of this diameter D3 generally can equal 2M, M is the maximum in the diameter D1 of the cross gate 1 and diameter D2 of ingate 2, that is, D3=2M, M=Max(D1, D2).The length L of described equal streambuf 3 is greater than the diameter D2 of ingate 2, generally can equal 2 times of the diameter D2 of ingate, i.e. L=2D2.
See Fig. 2, the shaft core position of described ingate 2 should meet following condition:
0.5D2＜l＜L﹣0.5D2，
Wherein, l is the distance of the axle center of ingate 2 and the link of equal streambuf 3 and cross gate 1,
D2 is the diameter of ingate 2,
L is the length of equal streambuf 3.
Usually, the better position in the axle center of described ingate 2 be positioned at equal streambuf 3 length L on golden section point near cross gate 1 side.
The upwards cone angle of described ingate 2 is 0 ° ~ 60 °, is preferably 20 ° ~ 30 °, can require to determine according to actual production.
Elaborate to embodiments of the invention below in conjunction with accompanying drawing, this embodiment gives detailed embodiment and concrete parameter premised on technical solution of the present invention, but protection scope of the present invention is not limited only to following embodiment.
Embodiment one
The present embodiment is the casting that the present invention is applied to 40 tons of steel ingots, and its basic technology structure is as described in above technical scheme, and concrete technology structural parameters are as follows:
Casting mold 5 adds rising head 6 height overall 3430mm; The diameter of sprue 4 is 60mm, high 3880mm; The diameter D1 of cross gate 1 is 60mm; The diameter D2 of ingate 2 is 120mm; The diameter D3 of equal streambuf 3 is 240mm, and the length L of equal streambuf 3 is 270mm; On the length L that the axle center of ingate 2 is positioned at equal streambuf 3 in the golden section point of cross gate 1 side.During casting, the filling velocity of metal liquid stream is 27.8kg/s.
The contrast of the present embodiment and prior art can consult the Flow Field Distribution figure of ingate exit cross-section when Fig. 3 fills type 14%.Figure is a) the ingate Flow Field Distribution figure of the present embodiment one, and this ingate does not arrange cone angle, and from figure, ingate velocity flow profile is comparatively even, and velocity flow profile scope is between 70 ~ 180cm/s; Figure is b) for having the Flow Field Distribution figure of the existing process structure of 15 ° of upward opening cone angles without equal streambuf, ingate, from figure, its flow rates is between 50 ~ 240cm/s; Figure be c) that from scheming, its flow rates is between 50 ~ 335cm/s without even buffering area, ingate without the Flow Field Distribution figure of the existing process structure of cone angle or small-angle; From comparing result, the even results of equal streambuf 3 stream field of the present invention is fairly obvious.
Fig. 4 is the flow field figure of embodiments of the invention one ingot casting when filling type 17%, and from figure, in cavity filling process, metal liquid stream substantially completely steadily.
Embodiment two
The present embodiment is the casting that the present invention is applied to 63.5 tons of steel ingots, and its basic technology structure is as described in above technical scheme, and concrete technology structural parameters are as follows:
The diameter of sprue 4 is 90mm, high 4450mm; The diameter D1 of cross gate 1 is 60mm; The diameter D2 of ingate 2 is 120mm, without cone angle, and high 256mm; The diameter D3 of equal streambuf 3 is 120mm, and the length L of equal streambuf 3 is 240mm; The distance l=120mm of the axle center of ingate 2 and the link of equal streambuf 3 and cross gate 1; During casting, the filling velocity of metal liquid stream is 29.4kg/s.
The contrast of the present embodiment and prior art can consult the Flow Field Distribution figure of ingate exit cross-section when Fig. 5 fills type 21.4s.Figure is a) the ingate Flow Field Distribution figure of the present embodiment two, and from figure, ingate velocity flow profile scope is 20 ~ 145cm/s; Figure be b) the Flow Field Distribution figure of existing process structure without equal streambuf, and from scheming, ingate velocity flow profile scope is 0 ~ 200cm/s; From comparing result, the current balance function of equal streambuf of the present invention 3 pairs of ingate 2 inner metal liquid stream flow velocitys clearly.
Embodiment three
The present embodiment is the casting that the present invention is applied to 63.5 tons of steel ingots, and its basic technology structure is as described in above technical scheme, and concrete technology structural parameters are as follows:
The diameter of sprue 4 is 90mm, high 4450mm; The diameter D1 of cross gate 1 is 60mm; The diameter D2 of ingate 2 lower port is 90mm, cone angle 10 °, high 256mm; The diameter D3 of equal streambuf 3 is 220mm, and the length L of equal streambuf 3 is 310mm; The distance l=150mm of the axle center of ingate 2 and the link of equal streambuf 3 and cross gate 1; During casting, the filling velocity of metal liquid stream is 29.4kg/s.
The effect of the present embodiment can consult Flow Field Distribution when Fig. 6 fills type 21.4s on ingate cross section, and figure is a) ingate 2 entrance section, and figure is b) ingate 2 outlet.From figure, the distribution of ingate 2 portal metal flow stream velocity becomes very even, and scope is 27 ~ 100cm/s; Exit is because ingate 2 diameter becomes large, and speed reduces further, and distribution is <74cm/s.In the present embodiment, because entrance flow velocity is homogenized, reduce the peak value of metal liquid stream flow velocity, outlet diameter amplifies further, and flow velocity reduces further, and therefore metal liquid stream fills type very steadily, liquid level figure in effect casting mold as shown in Figure 7.
Claims (4)
1. the process structure for ingate flow field even in upper punch formula running gate system, for 40 tons and above ingot casting, comprise sprue, cross gate, ingate, casting mold and rising head, wherein, vertical sprue is connected with the cross gate of level, it is characterized in that: described process structure also includes and arranges and the equal streambuf be connected between cross gate and ingate, this equal streambuf is horizontal column type and coaxial with cross gate, the diameter D3 of described equal streambuf is greater than the diameter D1 of described cross gate, and be more than or equal to the diameter D2 of described ingate, the length L of described equal streambuf is greater than the diameter D2 of ingate, golden section point near cross gate side on the length L that the shaft core position of described ingate is positioned at equal streambuf, molten metal forms the convection current of at least two different directions in described equal streambuf, mutually slackens flow velocity and realizes homogenising, more steadily enter ingate after liquidating.
2. the process structure for ingate flow field even in upper punch formula running gate system according to claim 1, it is characterized in that: the diameter D3 of described equal streambuf equals 2M, M is the maximum in the diameter D1 of cross gate and the diameter D2 of ingate.
3. the process structure for ingate flow field even in upper punch formula running gate system according to claim 1, is characterized in that: the length L of described equal streambuf equals 2 times of the diameter D2 of ingate.
4. the process structure for ingate flow field even in upper punch formula running gate system according to claim 1, is characterized in that: the shaft core position of described ingate meets following condition:
0.5D2＜l＜L﹣0.5D2，
Wherein, l is the distance of the axle center of ingate and the link of equal streambuf and cross gate,
D2 is the diameter of ingate,
L is the length of equal streambuf.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210473600.0A CN102962403B (en) | 2012-11-20 | 2012-11-20 | A kind of process structure for ingate flow field even in upper punch formula running gate system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210473600.0A CN102962403B (en) | 2012-11-20 | 2012-11-20 | A kind of process structure for ingate flow field even in upper punch formula running gate system |
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| CN102962403A CN102962403A (en) | 2013-03-13 |
| CN102962403B true CN102962403B (en) | 2015-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103600033B (en) * | 2013-09-22 | 2015-12-09 | 日月重工股份有限公司 | Cast structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052622A (en) * | 1989-12-19 | 1991-07-03 | 哈大为 | A kind of novel continuous-flow type running gate system that goes up |
| CN202070720U (en) * | 2011-04-22 | 2011-12-14 | 日月重工股份有限公司 | Bottom gating system |
| CN102463326A (en) * | 2010-10-28 | 2012-05-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Casting die for valve shell casting of marine diesel engine and casting process of valve shell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106658A (en) * | 1979-02-09 | 1980-08-15 | Hitachi Metals Ltd | Mold of pipe joint |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052622A (en) * | 1989-12-19 | 1991-07-03 | 哈大为 | A kind of novel continuous-flow type running gate system that goes up |
| CN102463326A (en) * | 2010-10-28 | 2012-05-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Casting die for valve shell casting of marine diesel engine and casting process of valve shell |
| CN202070720U (en) * | 2011-04-22 | 2011-12-14 | 日月重工股份有限公司 | Bottom gating system |
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