CN104550890A - Pouring system for reducing mold filling speed in pouring gate - Google Patents
Pouring system for reducing mold filling speed in pouring gate Download PDFInfo
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- CN104550890A CN104550890A CN201410823258.1A CN201410823258A CN104550890A CN 104550890 A CN104550890 A CN 104550890A CN 201410823258 A CN201410823258 A CN 201410823258A CN 104550890 A CN104550890 A CN 104550890A
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- pouring
- earthenware
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- ingate
- pouring gate
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Abstract
The invention relates to pouring system for reducing the mold filling speed in a pouring gate, belonging to the technical field of casting. The pouring system comprises a straight pouring gate, a transverse pouring gate and an inner pouring gate, wherein a plurality of inner rear pouring gates are also connected to the tail end of the inner pouring gate through a bypass, the sum S straight of valid cross section area of the straight pouring gate, the sum S transverse of the valid cross section area of the transverse pouring gate, the sum S inner of the valid cross section area of the inner pouring gate and the sum S inner rear of the valid cross section area of the inner rear pouring gate satisfies the following condition: the ratio of S straight to S transverse to S inner to S inner rear is equal to 1: (1.5-3): (0.7-0.9): (1.5-4). By adopting the pouring system, the low-speed multipoint inflow rapid molding filling can be realized, the metal liquid mold filling is more stable, the splash and oxidation of the metal liquid can be reduced, the slag carrying and sand carrying defects of a casting caused by high-speed erosion of metal liquid to a mold cavity can be avoided, and the pouring system is particularly suitable for a large-sized casting.
Description
Technical field
Of the present inventionly relate to casting technology field, particularly a kind of running gate system reducing filling velocity in running channel.
Background technology
The production of premium casting comprises good smelting process and stable casting technique.Wherein running gate system is part important in casting technique.Running gate system refers to that in casting mold, liquid metal flows into the passage general name of die cavity, is divided into closed, open and semi-enclosed.Under positive-pressure gating system can be regarded as normal pouring condition, molten metal is full of running channel, also referred to as being full of formula running gate system.Because the molten metal pressure on gross section is all higher than gas pressure in die cavity, so system is positive pressure system.Positive-pressure gating system has resistance slag ability preferably, and molten metal can be prevented to be involved in gas, consume metal few, cleaning is convenient.But it also has a lot of shortcoming: the molten metal flow velocity of die cavity of entering is high, easily produce splash and sand washing, make burning, and disturbance, eddy current and injustice easily occur type inner metal liquid.Generally be applied to small-sized foundry goods, be not suitable on heavy castings.During unchoked running system cast, molten metal is not easily full of running gate system, in flow regime with no pressure, fills type steady, little to the scouring force of die cavity, but pushing off the slag ability, molten metal consumption is many, and cleaning inconvenience.Enlarged running system falls between, and in cast, runner system can be full of, but running gate system is closed more late, has certain pushing off the slag ability.
The general structure of the running gate system of foundry goods of the prior art as shown in Figure 1, comprise sprue, cross gate and ingate, the flow velocity of the molten metal flowed out in its ingate is very fast, large to the impulsive force of casting mold, make to fill type steady not, be difficult to apply on heavy castings.
Summary of the invention
Of the present invention for injection system structure Problems existing in prior art, a kind of running gate system reducing filling velocity in running channel is provided, so that weaken molten metal erosion die cavity when type is filled in cast, avoids the defects such as foundry goods slag inclusion.
The object of the present invention is achieved like this, and a kind of running gate system reducing filling velocity in running channel, comprises sprue, cross gate, ingate, and the end of described ingate also bypass is connected with some interior rear running channels, the net sectional area sum S of described sprue
directly, horizontal running channel of writing net sectional area sum S
horizontal, ingate net sectional area sum S
inwith the net sectional area sum S of interior rear running channel
after interiorratio S
directly: S
horizontal: S
in: S
after interiorfor=1:(1.5-3): (0.7-0.9): (1.5-4), the net sectional area of described ingate calculates by formula 1:
（1）
In formula,
W-poured weights (Kg);
ρ-molten metal density (g/cm
2), magnesium iron gets 6.9 usually;
F
v-velocity coeffficient;
T-duration of pouring (s);
H
p-average static pressure grease head highness (cm);
The duration of pouring, t calculated by formula 2:
（2）
In formula,
F-material coefficient, grey ironware gets 1.0, and G. Iron Castings gets 0.6;
G
partfor casting pouring weight Kg;
σ is the wall thickness mm of foundry goods main body thinnest part.
Running gate system of the present invention, running channel after in many mouthfuls is changed into by with the ingate that foundry goods die cavity is directly connected, the sectional area of running channel outlet after in increasing, low speed multiple spot influent stream can be realized and fill type fast, make liquid metal filling more steady, reduce molten metal splashing oxidation, avoid molten metal high speed erosion die cavity to cause foundry goods slag inclusion, burning into sand defect, positive-pressure gating system and open advantage of watering system is had concurrently to make running gate system of the present invention, and be applicable to the cast of heavy castings, thus improve quality and the cast efficiency of heavy castings.
For accurately determining the liquid metal filling speed of interior rear running channel further, the type flow velocity that fills of described interior rear sprue metal liquid is,
, by method of the present invention, the final filling velocity that can make interior rear sprue metal liquid is 0.3-1m/s, realizes low speed and steadily surely fills type.
As the improvement of pouring gate structure rear in running gate system of the present invention, described ingate end is connected with one or more threeway earthenware in turn, the end of the threeway earthenware of least significant end is connected with L-type earthenware, and the by-pass port of described threeway earthenware and L-type earthenware forms interior rear running channel outlet.
As the further improvement of pouring gate structure rear in running gate system of the present invention, the shape of the by-pass port of described threeway earthenware and L-type earthenware is flat rectangular.
Accompanying drawing explanation
Fig. 1 is the structural representation of running gate system of the prior art.
The injection system structure schematic diagram of filling velocity in Fig. 2 reduction running channel of the present invention.
Fig. 3 is the structural representation of threeway earthenware.
Fig. 4 is the structural representation of L-type earthenware.
Detailed description of the invention
embodiment 1
As Fig. 2, Fig. 3 and the running gate system that Figure 4 shows that filling velocity in reduction running channel of the present invention, comprise sprue 1, cross gate 2, ingate 3, the quantity of ingate 3 can be set up in parallel multiple from bypass cross gate 2 according to the structure of die cavity and size, the end of each ingate 3 also successively bypass be connected with some interior rear running channels 4, in the present invention, after interior, the structure of running channel 4 is for be connected with one or more threeway earthenware 4A in turn at each ingate 3 end, the end of the threeway earthenware 4A of least significant end is connected with a L-type earthenware 4B, all threeway earthenware 4A on same ingate 3 and L-type earthenware 4B are rear running channel in forming one group, and it is steady for ease of liquid metal filling, the shape of the by-pass port of threeway earthenware 4A and L-type earthenware 4B is flat rectangular.
Embodiment 2
The running gate system of filling velocity in reduction running channel of the present invention is adopted to be applied particularly to certain foreign-going ship propeller gondola foundry goods of our company's production, profile is streamlined, material EN-GTJS-400-18, foundry goods appearance and size 2368*1956*1881, foundry goods main body wall thickness 35mm, casting weight 6676kg, poured weights 7986kg.Iron liquid-tight degree 6.9 g/cm
2, select from maximum cross-section somatotype, splashing for preventing iron liquid is oxidized, and realizes steadily pouring into a mould, and selects rising pouring to fill type cast (f
v=0.4).By formula (2), calculate the 70.6s duration of pouring, Hp is 216cm, then through type (1) calculates S resistance=63cm
2, by closing/enlarged running system, ingate is as minimum choked flow cross section, and ingate magnetic tube is chosen as 4-Φ 45(63.58cm
2), connect two T-shaped threeways after each ingate magnetic tube, threeway outlet is the flat mouth of the rectangle L-type bend pipe identical with an outlet size of 15 × 55, each sectional area of running channel constituent element and ratio S straight: S is horizontal: in S: after in S=70.84 cm
2: 116 cm
2: 63.58 cm
2: 254 cm
2=1:1.64:0.9:3.6, iron liquid is by the S after ingate
after interiorcross section enters die cavity, and the iron liquid speed entering die cavity is
, calculate V
after interior=0.65m/s.
When adopting running gate system pouring cast part of the present invention, fill type steady, decrease slag inclusion, burning into sand defect in the splashing oxidation of molten metal, foundry goods and obviously reduce, product quality significantly improves.
Running gate system of the present invention does not limit office in above-described embodiment, in practical application, according to the structure of foundry goods and size, suitably can adjust S within the scope of the invention
directly, S
horizontal, S
in, S
after interiorconcrete ratio and other relevant parameter, with the requirement of satisfied actual casting structure and pouring procedure.
Claims (4)
1. reduce a running gate system for filling velocity in running channel, comprise sprue, cross gate, ingate, it is characterized in that, the end of described ingate also bypass is connected with some interior rear running channels side by side, the net sectional area sum S of described sprue
directly, cross gate net sectional area sum S
horizontal, ingate net sectional area sum S
inwith the net sectional area sum S of interior rear running channel
after interiorratio S
directly: S
horizontal: S
in: S
after interiorfor=1:(1.5-3): (0.7-0.9): (1.5-4), the net sectional area of described ingate calculates by formula 1:
（1）
In formula,
W-poured weights (Kg);
ρ-molten metal density (Kg/cm
2), magnesium iron gets 6.9 usually;
F
v-velocity coeffficient;
T-duration of pouring (s);
H
p-average static pressure grease head highness (cm);
The duration of pouring, t calculated by formula 2:
（2）
In formula, f is material coefficient, and grey ironware gets 1.0, and G. Iron Castings gets 0.6;
G
partfor casting pouring weight Kg;
The wall thickness mm of σ foundry goods main body thinnest part.
2. the running gate system of filling velocity in reduction running channel according to claim 1, it is characterized in that, the type flow velocity that fills of described interior rear sprue metal liquid is:
.
3. the running gate system of filling velocity in reduction running channel according to claim 2, it is characterized in that, described ingate end is connected with one or more threeway earthenware in turn, the end of the threeway earthenware of least significant end is connected with L-type earthenware, and the by-pass port of described threeway earthenware and L-type earthenware forms interior rear running channel outlet.
4. the running gate system of filling velocity in reduction running channel according to claim 2, it is characterized in that, the shape of the by-pass port of described threeway earthenware and L-type earthenware is flat rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823258.1A CN104550890A (en) | 2014-12-26 | 2014-12-26 | Pouring system for reducing mold filling speed in pouring gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823258.1A CN104550890A (en) | 2014-12-26 | 2014-12-26 | Pouring system for reducing mold filling speed in pouring gate |
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| Publication Number | Publication Date |
|---|---|
| CN104550890A true CN104550890A (en) | 2015-04-29 |
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ID=53068549
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|---|---|---|---|
| CN201410823258.1A Pending CN104550890A (en) | 2014-12-26 | 2014-12-26 | Pouring system for reducing mold filling speed in pouring gate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942230A (en) * | 2015-06-23 | 2015-09-30 | 长兴县长安造型耐火材料厂 | Pipe for pouring |
| CN106077493A (en) * | 2016-08-25 | 2016-11-09 | 四川南车共享铸造有限公司 | A kind of running gate system for casting diesel-engine body foundry goods |
| CN107321925A (en) * | 2017-07-19 | 2017-11-07 | 南通国盛铸造有限公司 | A kind of snakelike flat threeway earthenware of casting pouring |
| CN107350428A (en) * | 2017-07-19 | 2017-11-17 | 南通国盛铸造有限公司 | One kind is used for lathe gray iron casting shaping running gate system |
| CN107716871A (en) * | 2017-09-22 | 2018-02-23 | 共享装备股份有限公司 | Negative-pressure los mould casting running gate system |
| CN108941469A (en) * | 2018-08-16 | 2018-12-07 | 西峡县西泵特种铸造有限公司 | A kind of technique of heat resisting steel volute running channel pushing off the slag and feeding |
| CN110076293A (en) * | 2019-04-25 | 2019-08-02 | 河南广瑞汽车部件股份有限公司 | A kind of control steering gear housing generates the running gate system and its process of shrinkage porosite and sand washing |
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| CN103736928A (en) * | 2014-01-17 | 2014-04-23 | 合肥工业大学 | Evanescent mode pouring system of speed changing box body |
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| US5620044A (en) * | 1994-10-07 | 1997-04-15 | Ford Motor Company | Gravity precision sand casting of aluminum and equivalent metals |
| CN1711143A (en) * | 2002-11-13 | 2005-12-21 | 花王株式会社 | Member for producing castings |
| JP2005193241A (en) * | 2003-12-26 | 2005-07-21 | Toyota Motor Corp | Die casting die, and die casting method |
| CN102380584A (en) * | 2011-10-18 | 2012-03-21 | 南通宏德机电有限公司 | Casting process for producing nodular cast iron planetary carrier based on principle of equilibrium temperature field and flow velocity field |
| CN103736928A (en) * | 2014-01-17 | 2014-04-23 | 合肥工业大学 | Evanescent mode pouring system of speed changing box body |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942230A (en) * | 2015-06-23 | 2015-09-30 | 长兴县长安造型耐火材料厂 | Pipe for pouring |
| CN106077493A (en) * | 2016-08-25 | 2016-11-09 | 四川南车共享铸造有限公司 | A kind of running gate system for casting diesel-engine body foundry goods |
| CN107321925A (en) * | 2017-07-19 | 2017-11-07 | 南通国盛铸造有限公司 | A kind of snakelike flat threeway earthenware of casting pouring |
| CN107350428A (en) * | 2017-07-19 | 2017-11-17 | 南通国盛铸造有限公司 | One kind is used for lathe gray iron casting shaping running gate system |
| WO2019015045A1 (en) * | 2017-07-19 | 2019-01-24 | 南通国盛铸造有限公司 | Casting system for forming machine tool grey cast iron |
| CN107716871A (en) * | 2017-09-22 | 2018-02-23 | 共享装备股份有限公司 | Negative-pressure los mould casting running gate system |
| CN108941469A (en) * | 2018-08-16 | 2018-12-07 | 西峡县西泵特种铸造有限公司 | A kind of technique of heat resisting steel volute running channel pushing off the slag and feeding |
| CN110076293A (en) * | 2019-04-25 | 2019-08-02 | 河南广瑞汽车部件股份有限公司 | A kind of control steering gear housing generates the running gate system and its process of shrinkage porosite and sand washing |
| CN110076293B (en) * | 2019-04-25 | 2024-02-27 | 河南广瑞汽车部件股份有限公司 | Pouring system for controlling steering gear shell to generate shrinkage porosity and sand washing and process method thereof |
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Application publication date: 20150429 |