CN106735107A - Casting - Google Patents
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- Publication number
- CN106735107A CN106735107A CN201510830241.3A CN201510830241A CN106735107A CN 106735107 A CN106735107 A CN 106735107A CN 201510830241 A CN201510830241 A CN 201510830241A CN 106735107 A CN106735107 A CN 106735107A
- Authority
- CN
- China
- Prior art keywords
- motlten metal
- cavity portion
- casting
- cast
- height
- 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
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Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dental Prosthetics (AREA)
Abstract
The present invention provides the casting that a kind of use aeration mold passes through gravity-assist pouring, and it is only to desired cavity portion filling motlten metal in mold cavity and solidifies it.After pouring into a mould the motlten metal with the roughly equal volume of volume of the desired cavity portion of desired filling motlten metal, compressed air is sent into from gate part, and motlten metal is filled into desired cavity portion, solidify it.And as needed cast before and after die cavity is depressurized.
Description
Technical field
The present invention relates to a kind of high precision int and the casting of high production rate, the casting is from the mold of aeration mold
Portion or sidepiece carry out the casting of gravity-assist pouring.
Background technology
The mold that using sand as aeration mold carries out moulding (moulding) is most commonly seen, in addition, uses ceramics
The mold that particle or metallic carry out moulding is also widely used.Even in addition, gypsum etc. does not have aeration substantially
Mold, the mold for being mixed into or imparting aeration in part with aeration material is also seen as aeration mold.In addition,
Even if in the case of the metal mold without aeration completely, setting passage or air vent and imparting the mold of aeration
Also it is seen as aeration mold.Aeration mold of the invention is the mold comprising above-mentioned these aeration molds.Generally, exist
In casting, mold cavity by gate part, running channel portion, emit oral area and product portion is constituted.In addition, as needed, there is also setting
The situation of overflow part etc. is set to discharge unwanted motlten metal from product portion, it is simple herein for explanation is made, it is believed that
By basic gate part, running channel portion, emit oral area and product portion is constituted.
Typically, in any casting in vacuum process in usual casting and as special casting etc., pour
Casting is all the process for completing this 4 cavity portion fillings.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.
More than in such existing any casting, in order to obtain the product as initial purpose, using last
To unwanted gate part, running channel portion and emit the casting process that motlten metal is filled in oral area.This is extremely irrational.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 die cavity such as oral area
Motlten metal is filled in part and is allowed to solidify, it becomes possible to greatly improve the injection represented by product portion weight/total injection weight
Qualification rate, and parting (solution frame), product separate etc. subsequent handling also can significantly be simplified.
Therefore prior art is investigated, but the casting of gravity-assist pouring is carried out from the mold top of aeration mold and sidepiece
Make in method, do not find to disclose the desired casting side for only filling motlten metal to cavity portion in mold cavity completely
Method.
Used as such desired casting that motlten metal can be only filled to cavity portion, vacuum process is considered as
Feasibility highest.Therefore as the reference exampless of prior art, following patent document 1 to 15 is enumerated.But, any of which
One be all to gate part, running channel portion, emit the existing skill that motlten metal is filled in whole cavity portions in oral area and product portion
Art.
(method 1)
A kind of casting, is the motlten metal of γ from mold top or sidepiece gravity-assist pouring to aeration mold by proportion, its
It is characterised by, starts desired filling out among cast and the die cavity of the aeration mold being made up of gate part, running channel portion, product portion
After filling desired cavity portion, the i.e. motlten metal of the roughly equal volume of product portion volume of motlten metal, finally it is cast
Motlten metal when gate part or by after gate part, promptly compressed gas are 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 solidify it.In this method, in order that saying
It is bright simple, and think the die cavity of mold by gate part, running channel portion, emit oral area and product portion is constituted.And, it is desirable to filling melting gold
The desired cavity portion of category is product portion.
First to the desired cavity portion i.e. product portion poured into a mould in the die cavity of aeration mold with desired filling motlten metal
Volume equal volume motlten metal.Motlten metal enters from gate part and is partially filled with to running channel portion and product portion.Such as
Fruit keeps so, and motlten metal is distributed to the various pieces of die cavity and each cavity portion forms the motlten metal of sustained height
Face, does not reach the purpose that motlten metal is only filled in desired cavity portion i.e. product portion of the invention.
So, in the method, the suitable time after cast starts sends into compressed gas from gate part, will by the pressure
Motlten metal is pressed into product portion, it is filled into desired cavity portion i.e. product portion and is solidified.Because motlten metal
Volume and desired cavity portion are that the volume in product portion is roughly equal, are thus product portion only to desired cavity portion
Middle filling motlten metal.
In order to pour into a mould the motlten metal of the volume roughly equal with the volume of desired cavity portion, it is possible to use small casting ladle
Each mold is measured and poured into a mould one by one, it is also possible to which the amount that 1 mold is measured from big casting ladle is poured into a mould.So-called substantially phase
Deng volume motlten metal, it is meant that consider to be multiplied by conjunction with thermal expansion of floating and die cavity of upper mould etc. of cast
The volume of suitable safety coefficient.
As compressed gas, in general compressed air easy to use and cheap.In addition, not active nitrogen of compression etc.
There is effect in the sense that the oxidation for preventing motlten metal.
Flange of snorkel etc. blocks gate part and compressed gas is not leaked from gate part when feeding compressed gas, this
Effect to filling motlten metal is very big.In addition, because can weaken compressed gas from the leakage of the outer peripheral face of mold will fill melting
The metal filled effect in desired die cavity, therefore can be preferably able to implement some on outer peripheral face if to prevent gas
The countermeasure of leakage.Certainly, in the case where the venting quality of mold is low, or mold entirety 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.
The so-called suitable time after gate part is sent into the cast of compressed gas, preferably after cast starts, finally
Motlten metal by the time after in the way of gate part as early as possible.Because the melting gold being filled if having supplied gas late
What is belonged to starts solidification, the problems such as being susceptible to cold shut, cold shut, produce oxide.
So-called filling motlten metal simultaneously makes its solidification be not meant to solidify all motlten metals being filled.Motlten metal
From desired cavity portion outflow because from make motlten metal fill desired by cavity portion and other die cavity portions
Flowed out near the boundary portion divided, so being solidified at least near the boundary portion.In addition, the solidification of the part has been not necessarily
Full solidification, reaches that be prevented from just can be with from the degree i.e. solid-phase crystallization of desired cavity portion outflow.In implementation method 1
Represent in detail.
(method 2)
In the casting that method 1 is recorded, it is characterised in that send into compressed gas from gate part, motlten metal is filled into institute
Desired cavity portion, and supplying gas for the compressed gas is kept, so that motlten metal solidifies.
This method makes motlten metal fill desired die cavity portion and be allowed in the feature as method 1 with compressed air
In the casting of solidification, supplying gas and making melting golden for compressed gas is also kept after motlten metal is filled desired die cavity portion
Category solidification.By keeping supplying gas for compressed gas, made to be filled into desired cavity portion with the moulding pressure of compressed gas
Motlten metal from boundary portion portion's backflow nearby, and will not can make quick near boundary portion under the cooling effect of compressed gas
Solidification.Represented in detail in implementation method 2.
(method 3)
In casting method described in any one in method 1 and method 2, it is characterised in that the pressurization pressure of compressed gas
Power is more than the value of the motlten metal static pressure γ H determined by height H, wherein, the height H is from leading to desired die cavity portion
Height of the inflow entrance of the motlten metal for dividing to the topmost of desired cavity portion.
In this method, mold cavity by gate part, running channel portion, oral area is emitted and in the case that product portion is constituted, to will
Product portion and oral area is emitted as the desired cavity portion of desired filling and is filled the casting of motlten metal and is illustrated.For
Relatively reliable prevent the motlten metal being filled into desired cavity portion from running channel portion is flowed out near boundary portion
Side, makes the moulding pressure of compressed gas reach by the inflow entrance from the motlten metal for leading to desired cavity portion to institute's phase
It is more than the motlten metal static pressure γ H values that the height untill the topmost of the cavity portion of prestige is determined.Also, γ is motlten metal
Proportion (kgf/cm3), H are above-mentioned height (cm).Therefore, γ H are pressure (kgf/cm2).
When motlten metal static pressure γ H represent that the motlten metal for being filled into desired cavity portion flows out to running channel portion side
Motlten metal static pressure on hydrodynamics.Therefore, the moulding pressure of compressed gas is made to keep just preventing melting 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 motlten metal) beyond desired cavity portion
More than γ H.Represented in detail in implementation method 3.
Claims (8)
1. a kind of casting, is the motlten metal of γ from mold top or sidepiece gravity-assist pouring to aeration mold by proportion,
Characterized in that, wanting among starting cast and the die cavity of the aeration mold being made up of gate part, running channel portion, product portion
After filling desired cavity portion, the i.e. motlten metal of the roughly equal volume of product portion volume of motlten metal, finally poured
The motlten metal of note from gate part when gate part or by after gate part, promptly sending into compressed gas, so that melting
Metal will not be stuck in running channel portion and swimmingly be filled into desired cavity portion, and solidify it.
2. a kind of casting, is the motlten metal of γ from mold top or sidepiece gravity-assist pouring to aeration mold by proportion,
Characterized in that, start cast with by gate part, running channel portion, emit the die cavity of the aeration mold that oral area and product portion are constituted
Among desired filling motlten metal desired cavity portion, emit the molten of oral area and the product portion roughly equal volume of volume
After melting metal, when the motlten metal being finally cast is readily through gate part or by after gate part, promptly from cast gate
Portion sends into compressed gas, and the moulding pressure of compressed gas is more than the value of the motlten metal static pressure γ H determined by height H, wherein,
The height H is from the inflow entrance of the motlten metal for leading to above-mentioned desired cavity portion to above-mentioned desired cavity portion
Topmost untill height so that motlten metal will not be stuck in running channel portion and swimmingly be filled into desired die cavity portion
Point, and solidify it.
3. casting as claimed in claim 1 or 2, it is characterised in that send into compressed gas from gate part, fill out motlten metal
Above-mentioned desired cavity portion is charged to, and uses blocking means, so that the motlten metal of filling will not be from the desired type
Flowed back near cavity segment and the boundary portion of other cavity portions.
4. casting as claimed in claim 3, it is characterised in that as the screening for making the motlten metal of above-mentioned filling not flow back
Cut off the hands section, use the means near cooling boundary portion.
5. casting as claimed in claim 3, it is characterised in that as the screening for making the motlten metal of above-mentioned filling not flow back
Cut off the hands section, use the means near mechanically blocking boundary portion.
6. casting as claimed in claim 1, it is characterised 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 claimed in claim 1, it is characterised in that before cast or after cast starts, desired filling is above-mentioned
The degree of decompression of the desired cavity portion of motlten metal is set as the absolute value of the motlten metal static pressure γ H determined by height H
The decompression state of value above, wherein, the height H is the inflow entrance from the motlten metal for leading to the desired cavity portion
Height to the topmost of desired cavity portion.
8. casting as claimed in claim 1, it is characterised in that before cast or after cast starts, will want to fill out to state to fill
The degree of decompression of the desired cavity portion of motlten metal is set as absolute than the motlten metal static pressure γ H that are determined by height H
The decompression state of the low value of value, wherein, the height H is the inflow entrance from the motlten metal for leading to the desired cavity portion
Height to the topmost of desired cavity portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830241.3A CN106735107A (en) | 2015-11-25 | 2015-11-25 | Casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830241.3A CN106735107A (en) | 2015-11-25 | 2015-11-25 | Casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106735107A true CN106735107A (en) | 2017-05-31 |
Family
ID=58964632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510830241.3A Pending CN106735107A (en) | 2015-11-25 | 2015-11-25 | Casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106735107A (en) |
-
2015
- 2015-11-25 CN CN201510830241.3A patent/CN106735107A/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: 20170531 |
|
| WD01 | Invention patent application deemed withdrawn after publication |