CN109396350A - A kind of half mould it is pre-filled can tilting type gravity foundry technology - Google Patents
A kind of half mould it is pre-filled can tilting type gravity foundry technology Download PDFInfo
- Publication number
- CN109396350A CN109396350A CN201711484864.5A CN201711484864A CN109396350A CN 109396350 A CN109396350 A CN 109396350A CN 201711484864 A CN201711484864 A CN 201711484864A CN 109396350 A CN109396350 A CN 109396350A
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- CN
- China
- Prior art keywords
- half mould
- casting
- sprue cup
- aluminum alloy
- choked flow
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A kind of half mould it is pre-filled can tilting type gravity foundry technology, in the sprue cup of metal mold lower die and riser junction, choked flow section F is setLower resistancecm2, the sprue cup bottom surface in metal mold is padded, enable aluminum alloy to when liquid pours into sprue cup by sprue cup buffer nest buffering after directly through choked flow section packed type chamber, sprue cup volume VSprue cup≥QUpper half mould casting+QUpper half mould dead head/ ρ；The invention has the advantages that: drop of aluminum alloy melt during tilt pouring can reduce using the pre-filled technique of half mould, make fluid smoothly packed type chamber, also reduce heat loss, reduce the generation of secondary oxidation field trash in casting process, the upper half mould of underfill simultaneously can play the role of deslagging exhaust again during verting, and substantially reduce the incidence of hole.
Description
Technical field
The present invention relates to machinery equipment field, and in particular to a kind of half mould it is pre-filled can tilting type gravity foundry technology.
Background technique
Aluminium alloy verts gravity foundry technology the advantages of combining rising pouring and teeming, and enabling aluminum alloy to liquid, to fill type steady, reduces
The casting flaws such as slag stomata.The casting technique is a kind of advanced pouring technology of emerging development, in many foundry industries in the world
More developed country is widely used, and especially in some countries such as Europe, Japan, be used to cast such as car condenser gas chamber
The relatively large aluminium alloy car casting such as biggish thin-section casting and cylinder cap, inlet manifold.Aluminium alloy verts gravity foundry technology
Although comparing with traditional teeming, ladder casting with rising pouring, the generation that secondary oxidation is mingled in aluminium alloy casting process can be reduced.
But for some complicated or heavy castings, aluminum alloy melt drop is very big in spin casting process, and the speed of filled-type chamber is also very big,
Turbulent flow can be generated, the casting produced can generate the slag gas hole defect of larger proportion.
Summary of the invention
The purpose of the present invention is to above-mentioned deficiencies, and provide a kind of half mould it is pre-filled can tilting type gravitational casting
Technique.
Choked flow section F is arranged in the sprue cup of metal mold lower die and riser junction in the present inventionLower resistancecm2, wherein FLower resistance=
QLower half mould casting∕ρνmaxг,
In formula: QLower half mould castingThe weight metal kg of part of the lower die is in for casting；
ρ is the density kg ∕ cm of aluminum alloy melt3；
νmaxThe permission maximum fluidity linear velocity in choked flow section, general ν are flowed through for aluminum alloy meltmax< 150cm ﹒ s-1；
г is time s needed for aluminum alloy melt is full of drag chamber, and г=H/ ν, Hcm are casting in the height of lower die, and ν is drag
The rate of climb cm ﹒ s of chamber metal bath surface-1, ν=3~4.2/b, b is casting section thickness cm；
By calculating, FLower resistance=7.5cm2, choked flow section is designed as isosceles trapezoid section, upper bottom is long be respectively 2.5cm,
1.8cm, a height of 3.5cm, part of the upper die is riser section at choked flow section；
Sprue cup bottom surface in metal mold is padded, it enables aluminum alloy to when liquid pours into sprue cup by buffering the slow of nest in sprue cup
Directly through choked flow section packed type chamber, sprue cup volume V after punchingSprue cup≥QUpper half mould casting+ QUpper half mould dead head/ ρ；
When casting, aluminum alloy melt directly passes through choked flow section into lower half mould chamber through sprue cup buffering nest, until being full of lower half mould
Chamber, then enable aluminum alloy to liquid by verting for casting machine and successively sequentially fill upper half mould chamber, until going to 90 °.
The invention has the advantages that: aluminum alloy melt falling during tilt pouring can reduce using the pre-filled technique of half mould
Difference makes fluid smoothly packed type chamber, also reduces heat loss, reduces the generation of secondary oxidation field trash in casting process,
The upper half mould of underfill simultaneously can play the role of deslagging exhaust again during verting, and substantially reduce the incidence of hole.
Detailed description of the invention
Fig. 1 is sprue cup structural schematic diagram of the present invention.
Fig. 2 is former sprue cup structural schematic diagram.
Fig. 3 is molten aluminum casting schematic diagram of the present invention.
Mold verts 30 ° of schematic diagrames when Fig. 4 is molten aluminum of the present invention casting.
Fig. 5 is that molten aluminum of the present invention is partially filled with metal mold cavity schematic diagram.
Fig. 6 is molten aluminum filling solidification schematic diagram of the present invention.
Specific embodiment
Choked flow section F is arranged in the sprue cup of metal mold lower die and riser junction in this hairLower resistancecm2, wherein FLower resistance=
QLower half mould casting∕ρνmaxг,
In formula: QLower half mould castingThe weight metal kg of part of the lower die is in for casting；
ρ is the density kg ∕ cm of aluminum alloy melt3；
νmaxThe permission maximum fluidity linear velocity in choked flow section, general ν are flowed through for aluminum alloy meltmax< 150cm ﹒ s-1；
г is time s needed for aluminum alloy melt is full of drag chamber, and г=H/ ν, Hcm are casting in the height of lower die, and ν is drag
The rate of climb cm ﹒ s of chamber metal bath surface-1, ν=3~4.2/b, b is casting section thickness cm；
By calculating, FLower resistance=7.5cm2, for convenience of demoulding, choked flow section is designed as isosceles trapezoid section, the long difference in upper bottom
For 2.5cm, 1.8cm, a height of 3.5cm, part of the upper die is riser section such as Fig. 1 at choked flow section.
It is to reduce aluminum alloy melt loading time and filling drop, the sprue cup bottom surface in metal mold is padded, so that aluminium closes
Directly through choked flow section packed type chamber, sprue cup volume after buffering the buffering of nest in sprue cup when golden liquid pours into sprue cup
VSprue cup≥QUpper half mould casting+ QUpper half mould dead head/ ρ, as shown in Figure 1.
When casting, aluminum alloy melt directly passes through choked flow section into lower half mould chamber through sprue cup buffering nest, until under being full of
Half mould chamber, then enable aluminum alloy to liquid by verting for casting machine and successively sequentially fill upper half mould chamber, until 90 ° are gone to, at the angle
Degree is convenient for riser feeding.
As shown in Fig. 2, choked flow section is provided with according to the pre-filled sprue cup for verting gravity foundry technology design of half mould,
Choked flow section is designed as isosceles trapezoid section, and long upper bottom is respectively 2.5cm, 1.8cm, a height of 3.5cm.
As shown in figures 3 to 6, aluminum alloy melt pours into sprue cup and passes through choked flow section, riser after sprue cup buffers nest and emit
Mouth neck filling gold genotype mo(u)ld bottom half, since riser neck mo(u)ld bottom half section is greater than mo(u)ld bottom half choked flow section, the flow velocity into type chamber is slack-off, and aluminium closes
Golden liquid filling is steady, and aluminum alloy melt pours into the poring rate of sprue cup at this time and the buffer function of sprue cup fills aluminum alloy melt
The speed of type chamber has a certain impact (as shown in Figure 3).With gradually increasing for aluminum alloy melt, aluminum alloy melt is full of under metal mold
Type, metal mold mo(u)ld top half are in be not filled by state (as shown in Figure 4).All topple over when aluminum alloy melt and finish, metal mold starts to incline immediately
Turn, at this stage in stowing operation, keeps speed of suitably verting, enable aluminum alloy to liquid and sequentially slide one by one, without big drop, aluminium
Aluminium alloy filling is steady, does not occur apparent volume gas, and half mould chamber is in underfill state on riser neck in stowing operation, is conducive to
The spilling of slag gas, the generation (as shown in Figure 5) for the defects of reducing casting slag stomata.When metal type dies vert 90 ° when aluminium close
Golden liquid has filled metal mold type chamber, in this case, realizes feeding (as shown in Figure 6) of the riser to casting.
Be respectively adopted can vert gravity foundry technology and half mould it is pre-filled vert gravity foundry technology production casting,
It finds to owe casting cold shut defect when casting, casting finds hole defect through Shot Blasting and when being machined.The statistic of attribute of casting
It is as shown in table 1:
1 casting quality statistical form of table
Table 1 shows can to vert using tradition, and to produce defect caused by certain type steering gear housing casting more for gravity foundry technology,
Ratio is 68.8%, using half mould it is pre-filled vert gravity foundry technology when, defect is greatly lowered, and defective proportion is only about
It is 2.6%, the main casting flaw of two kinds of casting techniques is slag stomata.
Claims (1)
1. a kind of half mould it is pre-filled can tilting type gravity foundry technology, it is characterised in that: metal mold lower die sprue cup and
Choked flow section F is arranged in riser junctionLower resistancecm2, wherein FLower resistance=QLower half mould casting∕ρνmaxг,
In formula: QLower half mould castingThe weight metal kg of part of the lower die is in for casting；ρ is the density kg ∕ cm of aluminum alloy melt3；νmaxFor aluminium
Aluminium alloy flows through the permission maximum fluidity linear velocity in choked flow section, general νmax< 150cm ﹒ s-1；г is that aluminum alloy melt is full of lower die
Time s needed for type chamber, г=H/ ν, Hcm are height of the casting in lower die, and ν is the rate of climb cm ﹒ of drag chamber metal bath surface
s-1, ν=3~4.2/b, b is casting section thickness cm；By calculating, FLower resistance=7.5cm2, choked flow section is isosceles trapezoid section, upper bottom
Long is respectively 2.5cm, 1.8cm, a height of 3.5cm, and part of the upper die is riser section at choked flow section；By the sprue cup in metal mold
Bottom surface is padded, enables aluminum alloy to when liquid pours into sprue cup by directly filling through choked flow section after buffering the buffering of nest in sprue cup
Type chamber, sprue cup volume VSprue cup≥QUpper half mould casting+ QUpper half mould dead head/ ρ；When casting, aluminum alloy melt directly passes through through sprue cup buffering nest
Choked flow section enters lower half mould chamber, until being full of lower half mould chamber, then enables aluminum alloy to the successive sequence of liquid by verting for casting machine
Half mould chamber in filling, until going to 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484864.5A CN109396350A (en) | 2017-12-29 | 2017-12-29 | A kind of half mould it is pre-filled can tilting type gravity foundry technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484864.5A CN109396350A (en) | 2017-12-29 | 2017-12-29 | A kind of half mould it is pre-filled can tilting type gravity foundry technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109396350A true CN109396350A (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711484864.5A Pending CN109396350A (en) | 2017-12-29 | 2017-12-29 | A kind of half mould it is pre-filled can tilting type gravity foundry technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022212219A1 (en) * | 2021-03-29 | 2022-10-06 | Skuld Llc | Process for evaporative casting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935491A (en) * | 2012-11-02 | 2013-02-20 | 温州瑞明工业股份有限公司 | Metal section mould with controllable cross section and gravity slantingly-rotated foundry technique of aluminum alloy cylinder cover of metal section mould |
| CN102974805A (en) * | 2012-10-14 | 2013-03-20 | 荆门航特有色金属铸造有限公司 | Semi-mold pre-filling titling casting process and special mold |
| CN202804148U (en) * | 2012-10-14 | 2013-03-20 | 荆门航特有色金属铸造有限公司 | Mold special for half-type pre-filling tilting casting technique |
-
2017
- 2017-12-29 CN CN201711484864.5A patent/CN109396350A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974805A (en) * | 2012-10-14 | 2013-03-20 | 荆门航特有色金属铸造有限公司 | Semi-mold pre-filling titling casting process and special mold |
| CN202804148U (en) * | 2012-10-14 | 2013-03-20 | 荆门航特有色金属铸造有限公司 | Mold special for half-type pre-filling tilting casting technique |
| CN102935491A (en) * | 2012-11-02 | 2013-02-20 | 温州瑞明工业股份有限公司 | Metal section mould with controllable cross section and gravity slantingly-rotated foundry technique of aluminum alloy cylinder cover of metal section mould |
Non-Patent Citations (1)
| Title |
|---|
| 杨兵兵: "《特种铸造》", 30 September 2010, 中南大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022212219A1 (en) * | 2021-03-29 | 2022-10-06 | Skuld Llc | Process for evaporative casting |
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Application publication date: 20190301 |