CN108145074A - Casting - Google Patents
Casting Download PDFInfo
- Publication number
- CN108145074A CN108145074A CN201611105131.1A CN201611105131A CN108145074A CN 108145074 A CN108145074 A CN 108145074A CN 201611105131 A CN201611105131 A CN 201611105131A CN 108145074 A CN108145074 A CN 108145074A
- Authority
- CN
- China
- Prior art keywords
- molten metal
- cavity portion
- casting
- cast
- desired cavity
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like 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
-
- 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
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
Abstract
The present invention provide it is a kind of with aeration mold by the casting of gravity-assist pouring, be desired cavity portion filling molten metal and to solidify its only into mold cavity.After the molten metal of the roughly equal volume of volume of desired cavity portion of the cast with wanting filling molten metal, compressed air is sent into, and molten metal is filled into desired cavity portion from gate part, makes its solidification.And depressurize cavity before and after cast as needed.
Description
Technical field
The present invention relates to a kind of high precision int and the casting of high production rate, which is from the mold of aeration mold
Portion or side carry out the casting of gravity-assist pouring.
Background technology
It is most commonly seen that the mold of sand progress moulding (moulding) is used as aeration mold, in addition to this, uses ceramics
The mold that particle or metallic carry out moulding is also widely used.In addition, even gypsum etc. does not have aeration substantially
Mold, the mold for being mixed into or imparting aeration in part with aeration material are also seen as aeration mold.In addition,
Even if in the case of completely without the metal mold of aeration, venthole or ventilation hole are set and impart the mold of aeration
Also it is seen as aeration mold.The aeration mold of the present invention is the mold for including these above-mentioned aeration molds.In general,
In casting, mold cavity by gate part, running channel portion, emit oral area and product portion is formed.In addition, as needed, there is also settings
The situation of overflow part etc. is set in order to discharge unwanted molten metal from product portion, here in order to make explanation simple, it is believed that
By basic gate part, running channel portion, emit oral area and product portion is formed.
Generally, it in any casting in usual casting and vacuum process as special casting etc., pours
Casting is all by this 4 cavity portion fillings and the process of completion.And after the completion of solidifying, only by necessary system in this 4 parts
Product part from and take out, after carrying out last trimming, obtain final casting Tetramune.
In above such existing any casting, the product as initial purpose in order to obtain, using last
To unwanted gate part, running channel portion and the casting process for emitting filling molten metal in oral area.This is extremely unreasonable.To this
By using certain methods, if it is possible to only to product portion or only to product portion and emit the necessary desired cavity such as oral area
Molten metal is filled in part and is allowed to solidify, it will be able to greatly improve the injection represented by product portion weight/total injection weight
Qualification rate, and the subsequent handlings such as parting (solution frame), product separation also can be significantly simplified.
Therefore the prior art is investigated, but the casting of gravity-assist pouring is carried out from the mold top of aeration mold and side
It makes in method, it is completely desired only to the casting side of cavity portion filling molten metal in mold cavity without finding to disclose
Method.
As such desired casting that molten metal can be only filled to cavity portion, vacuum process is considered as
Feasibility is highest.Therefore the reference exampless as the prior art, enumerate following patent document 1 to 15.But any of which
One is all to gate part, running channel portion, the existing skill for emitting filling molten metal in oral area and whole cavity portions in product portion
Art.
(method 1)
A kind of casting, by proportion be γ molten metal from mold top or side gravity-assist pouring to aeration mold,
It is characterized in that, starts cast and filled out with desired among the cavity of the aeration mold that is made of gate part, running channel portion, product portion
It fills the desired cavity portion of molten metal, i.e. after the molten metal of the roughly equal volume of product portion volume, be finally cast
Molten metal when passing through gate part or by gate part after, promptly compressed gas is sent into from gate part, so that melting gold
Category will not be stuck in running channel portion and swimmingly be filled into desired cavity portion, and make its solidification.In this method, in order to make
It is bright simple, and think the cavity of mold by gate part, running channel portion, emit oral area and product portion is formed.And, it is desirable to filling melting gold
The desired cavity portion belonged to is product portion.
Desired cavity portion, that is, product portion of the cast with wanting filling molten metal first into the cavity of aeration mold
Volume equal volume molten metal.Molten metal enters from gate part and is partially filled with to running channel portion and product portion.Such as
Fruit keeps in this way, molten metal is distributed to the various pieces of cavity and each cavity portion forms the molten metal of sustained height
Face, the present invention is not achieved only fills the purpose of molten metal in desired cavity portion i.e. product portion.
So in the method, the suitable time after cast starts is sent into compressed gas from gate part, it will by the pressure
Molten metal is pressed into product portion, it is made to be filled into desired cavity portion i.e. product portion and is solidified.Because molten metal
Volume and the volume in desired cavity portion, that is, product portion are roughly equal, thus only to desired cavity portion, that is, product portion
Middle filling molten metal.
In order to pour into a mould the molten metal of 7 volumes roughly equal with the volume of desired cavity portion, small pour can be used
Packet counts each mold one by one
It measures and pours into a mould, the amount that 1 mold can also be measured from big casting ladle is poured into a mould.So-called roughly equal volume melts
Melt metal, it is meant that consider the floating of the upper mold of adjoint cast and the thermal expansion of cavity etc. and be multiplied by suitable safety coefficient
Volume.
As compressed gas, in general using easy and cheap compressed air.In addition, not active nitrogen of compression etc.
There is effect in the sense that the oxidation for preventing molten metal.
Flange of snorkel etc. blocks gate part and compressed gas is made not leaked from gate part when being sent into compressed gas, this
It is very big to the effect for filling molten metal.In addition, because can weaken compressed gas from the leakage of the peripheral surface of mold will fill melting
Metal is filled into the effect in desired cavity, therefore can be preferably able to implement some on peripheral surface if to prevent gas
The countermeasure of leakage.Certainly, in the case where the venting quality of mold is low or the entirety of mold or a part by air-tight cavity or casting frame
In the case of Deng covering, it is not necessary that implement to prevent the measure of gas leakage.
It is so-called since gate part is sent into the cast of compressed gas after the suitable time, preferably after cast starts, last
Molten metal pass through gate part way in after time as early as possible.Because of the melting gold being filled if having supplied gas late
What is belonged to starts to solidify, and cold shut easily occurs, cold shut, generates the problems such as oxide.
So-called filling molten metal simultaneously makes its solidification be not meant to make all molten metal solidifications being filled.Molten metal
It is flowed out from desired cavity portion, is because from the desirable cavity portion that molten metal is filled and other cavity portions is made
The boundary portion divided nearby flows out, so at least the boundary portion nearby solidifies.In addition, the solidification of the part has been not necessarily
Full solidification, reaches the degree i.e. solid-phase crystallization that can prevent flowing out from desired cavity portion.In the embodiment 1
It represents in detail.
(method 2)
In the casting that method 1 is recorded, which is characterized in that be sent into compressed gas from gate part, molten metal is filled into institute
Desired cavity portion, and supplying gas for the compressed gas is kept, so that molten metal solidifies.
This method makes molten metal fill desired cavity portion and is allowed in the compressed air of the feature as method 1
In the casting of solidification, supplying gas and making melting golden for compressed gas is also kept after molten metal is made to fill desired cavity portion
Belong to solidification.By keeping supplying gas for compressed gas, made to be filled into desired cavity portion with the moulding pressure of compressed gas
Molten metal will not flow back in portion, and can make under the cooling effect of compressed gas quick near boundary portion near boundary portion
Solidification.It is represented in detail in embodiment 2.
(method 3)
In the casting method described in any one of method 1 and method 2, which is characterized in that the pressurization pressure of compressed gas
Power is more than the value of molten metal static pressure γ H determined by height H, wherein, the height H is from leading to desired cavity portion
Height until the inflow entrance to the topmost of desired cavity portion of the molten metal divided.
In this method, mold cavity by gate part, running channel portion, emit oral area and in the case that product portion is formed, to will
Product portion and oral area is emitted as the desired cavity portion for wanting to fill and fills the casting of molten metal and illustrates.For
Relatively reliable prevent the molten metal being filled into desired cavity portion from flowing out to running channel portion near boundary portion
Side makes the moulding pressure of compressed gas reach by the inflow entrance from the molten metal for leading to desired cavity portion to institute's phase
It is more than the molten metal static pressure γ H values that the height until the topmost of the cavity portion of prestige determines.Also, γ is molten metal
Proportion (kgf/cm3), H are above-mentioned height (cm).Therefore, γ H are pressure (kgf/cm2).
Molten metal static pressure γ H expressions be filled into the molten metal of desired cavity portion to running channel portion side flow out when
Molten metal static pressure on hydrodynamics.Therefore, the moulding pressure of compressed gas is made to keep just preventing to melt above
The outflow of metal.
The moulding pressure of compressed gas does not imply that the pressure of compressed gas, is considering from gate part and mold outer surface leakage pressure
On the basis of contracting air, reach the cavity portion (the unfilled cavity portion of molten metal) other than desired cavity portion
More than γ H.It is represented in detail in embodiment 3.
Claims (8)
1. a kind of casting, by molten metal that proportion is γ from mold top or side gravity-assist pouring to aeration mold,
It is characterized in that, start cast with wanting among the cavity of the aeration mold that is made of gate part, running channel portion, product portion
It fills the desired cavity portion of molten metal, i.e. after the molten metal of the roughly equal volume of product portion volume, finally poured
After when the molten metal of note passes through gate part or by gate part, compressed gas promptly is sent into from gate part, so that melting
Metal will not be stuck in running channel portion and swimmingly be filled into desired cavity portion, and make its solidification.
2. a kind of casting, by molten metal that proportion is γ from mold top or side gravity-assist pouring to aeration mold,
It is characterized in that, start cast with by gate part, running channel portion, emit oral area and the cavity of the aeration mold that product portion is formed
Among desired filling molten metal desired cavity portion, emit the molten of oral area and the roughly equal volume of product portion volume
After melting metal, the molten metal that is finally cast is readily through after during gate part or by gate part, promptly from cast gate
Portion is sent into compressed gas, and the moulding pressure of compressed gas is more than the value of molten metal static pressure γ H determined by height H, wherein,
The height H is from the inflow entrance for the molten metal for leading to above-mentioned desired cavity portion to above-mentioned desired cavity portion
Topmost until height so that molten metal will not be stuck in running channel portion and swimmingly be filled into desired cavity portion
Point, and make its solidification.
3. casting as claimed in claim 1 or 2, which is characterized in that be sent into compressed gas from gate part, fill out molten metal
Above-mentioned desired cavity portion is charged to, and uses blocking means, so that the molten metal of filling will not be from the desired type
The boundary portion of cavity segment and other cavity portions nearby flows back.
4. casting as claimed in claim 3, which is characterized in that as the screening that the molten metal of above-mentioned filling is made not flow back
It cuts off the hands section, uses the means near cooling boundary portion.
5. casting as claimed in claim 3, which is characterized in that as the screening that the molten metal of above-mentioned filling is made not flow back
It cuts off the hands section, uses the means mechanically interdicted near boundary portion.
6. casting as described in claim 1, which is characterized in that before cast or after cast starts, desired filling is above-mentioned molten
Melt the desired cavity portion decompression of metal.
7. casting as described in claim 1, which is characterized in that before cast or cast start after, by it is desired filling it is above-mentioned
The degree of decompression of the desired cavity portion of molten metal is set as the absolute value of molten metal static pressure γ H determined by height H
The decompression state of above value, wherein, the height H is the inflow entrance from the molten metal for leading to the desired cavity portion
Height until the topmost of desired cavity portion.
8. casting as described in claim 1, which is characterized in that before cast or cast start after, will want to fill out to state to fill
The degree of decompression of the desired cavity portion of molten metal is set as more absolute than the molten metal static pressure γ H that are determined by height H
It is worth the decompression state of low value, wherein, the height H is the inflow entrance from the molten metal for leading to the desired cavity portion
Height until the topmost of desired cavity portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105131.1A CN108145074A (en) | 2016-12-05 | 2016-12-05 | Casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611105131.1A CN108145074A (en) | 2016-12-05 | 2016-12-05 | Casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108145074A true CN108145074A (en) | 2018-06-12 |
Family
ID=62470970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611105131.1A Pending CN108145074A (en) | 2016-12-05 | 2016-12-05 | Casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108145074A (en) |
-
2016
- 2016-12-05 CN CN201611105131.1A patent/CN108145074A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180612 |
|
| WD01 | Invention patent application deemed withdrawn after publication |