CN1227777A - Process for obtaining non-ferrous metal castings by greensand mould casting - Google Patents
Process for obtaining non-ferrous metal castings by greensand mould casting Download PDFInfo
- Publication number
- CN1227777A CN1227777A CN99100403A CN99100403A CN1227777A CN 1227777 A CN1227777 A CN 1227777A CN 99100403 A CN99100403 A CN 99100403A CN 99100403 A CN99100403 A CN 99100403A CN 1227777 A CN1227777 A CN 1227777A
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- CN
- China
- Prior art keywords
- casting mold
- casting
- mold
- moulds
- station
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
- B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- 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
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D33/00—Equipment for handling moulds
- B22D33/005—Transporting flaskless moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D47/00—Casting plants
- B22D47/02—Casting plants for both moulding and casting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Devices For Molds (AREA)
Abstract
The process lies in drying the cavity of the greensand moulds in which molten metal is cast for obtaining respective castings, wherein drying of said cavity is made before the mould filling step in order to eliminate humidity and prevent porosities from being formed on the finished casting. In order for the cavity in the moulds to be dried, the moulds are provided with recesses in order that hot air may be applied through the top hood of a drying station and negative pressure or vacuum may be applied through a bottom sink, which results in a hot air stream flowing between the cavities in the moulds, directed towards the mould recesses, extracting the humidity from such moulds and redirecting the extracted water towards the bottom sink. In a different embodiment, the moulds have through recesses, which recesses are provided in the sector of the facility in which the moulds proper are conveyed from the moulding chamber to the filling station, the through recesses being provided by means of the piercing ends or points of respective rods that may be moved up and down.
Description
The present invention relates to a kind of for example method of aluminium casting of non-ferrous casting of making, it is that motlten metal is cast on the greensand mold, described casting mold before the casting metals through super-dry removing the moisture in the casting mold, and prevent from final foundry goods, to form the micro hole therefrom.
The purpose of this invention is to provide a kind of vertical greensand mold that has cavity or deep hole, corresponding die cavity is applied thermal current to make it dry by this cavity or deep hole and by vacuum.Another object of the present invention provides a kind of concrete grammar, and this method comprises: dry casting mold, filling casting mold, block cross gate with a cooling plug then, so that described cross gate rapid solidification and remove casting mold rapidly.
Another purpose of the present invention is that described deep hole is provided in such a way, to promote the vacuum operation through whole casting mold, so that motlten metal can be full of all casting mold space or passage when casting, thereby boosts productivity.When casting mold is positioned on the actual fed line that they is transported the filling station, make the deep hole that is used for vacuum operation.
The trouble of casting non-ferrous casting is that damp sand has a large amount of water in greensand mold, and content is 3.5%-4%, this means that the outer surface of formed foundry goods has many pores.
Having pore in final casting is that outer surface owing to foundry goods contacts with high-temperature molten metal and experiences strong heat effect, and this heat effect makes the moisture vaporization in the casting mold, and aluminium sucks hydrogen from water thus, thereby produces many micros hole on the surface of foundry goods.
A kind of approach that improves the outer surface quality of gained foundry goods is that the motlten metal in the casting mold is solidified rapidly, and knownly severally can make the motlten metal rapid cooling method, below it is illustrated:
-the motlten metal of in metal mold, casting, metal mold can realize desirable quick cooling, but the shortcoming of this method is to make the cost height of casting mold, and production capacity is restricted.
-make casting mold by magnetic mineral, it also can make motlten metal cool off fast and solidify, and the foundry goods that will produce has microstructure preferably.This method is documented among the PCT patent WO96/11761.
-make casting mold by a few part different materials, wherein a part is made by the metal with high thermal conductivity coefficient, and it is as the device of removing heat from motlten metal.This method is documented in the European patent EP 0557374.
Known that in foundry industry core can have cavity or deep hole reducing its weight or cost, yet also produced band cavity or deep hole up till now with the convenient greensand mold (mote) of removing the moisture in the damp sand.
In addition, when casting aluminium, practice shows that the natural humidity that keeps greensand mold is favourable, because this humidity can form the acid facial mask of self-shield foundry goods simultaneously in casting process.
Yet because aluminium casting is complex-shaped, molten aluminum is difficult to be full of fully all corner and spaces in the casting mold usually.Can improve and promote the filling of molten aluminum in casting mold by applying vacuum, for this reason, it is very favorable that deep hole or the duct of passing casting mold are set.
Method of the present invention has solved the problems referred to above fully, and it is a dry casting mold before the casting motlten metal, with the moisture in the removal casting mold, thereby prevents to form pore on resulting or final cast outer surface.
Method of the present invention thus is made up of the following step:
Manufacturing has the greensand mold of many cavitys or deep hole, and described deep hole or cavity can make thermal current flow through casting mold and remove the moisture of damp sand therefrom.
Casting mold is put into a dry station, and it is as the part of casting device, is subjected to thermal current taking away moisture wherein at this casting mold, and the air-flow of removing moisture is towards described cavity or deep hole.More particularly, described dry station has a top cover, side plate and priming reservoir, a bottom, make casting mold be positioned at a chamber of sealing fully thus, apply negative pressure through dehydrator and produce thermal current, moisture in the casting mold is inhaled to described cavity or deep hole from the inwall of die cavity, and then inhaled to dehydrator.
Said method comprises that also the casting mold with drying is placed in the chamber, this chamber comprises a top seal plate (by Driven by Hydraulic Cylinder), side plate and a bottom pumping system, they are used for before casting described chamber being applied vacuum, to remove the air or the gas that may be positioned at die cavity.
This method also comprises a step, in case promptly casting mold is full of and just stops up cross gate, this obstruction step is to be finished by a stopper that drives with cylinder.Described stopper has an inner chamber, and air stream or liquid stream can be flowed through this inner chamber and be made its end cooling, make the cross gate rapid solidification thus, so just can remove casting mold rapidly and begins a new circulation, so that improve the productivity ratio of machine.
In order to make the complete filling of metal all casting mold corner and space, importantly make described deep hole pass casting mold during cast aluminium, so that enhancing and promotion apply vacuum.In addition, this deep hole is just made when casting mold is positioned on the pipeline of filling station or casting station.The casting of molten aluminum is undertaken by applying vacuum, and vacuum can promote to fill type.
In the present invention, deep hole that forms in the casting mold or duct have promoted the vacuum operation by casting mold, thereby motlten metal can interior all duct or the corners of complete filling casting mold.
Another feature of the present invention relates to makes this device that passes the deep hole of casting mold, and this device has the most advanced and sophisticated drilling rods of many bands, and these drilling rods are by motor-driven, making it to drill casting mold, thereby forms through hole in casting mold.
At last, the device of described manufacturing through hole is provided with a center piston and guide rod, and they can make the manufacturing rising/decline of drilling rod along with described deep hole or duct.This device also is provided with a side piston, and it can make the relative casting mold in position of drilling rod change arbitrarily, thereby can obtain optimal duct according to their size.Thus, support the casting mold row and be provided with slotted hole, each and every one possible position that it can make that drilling rod passes that they can occupy for the base of its slip.
Describe the present invention and characteristics thereof in detail with most preferred embodiment with reference to the accompanying drawings below, they only are illustrative as a part of the present invention, and do not constitute the qualification to it.
Fig. 1 represents the casting mold that the inventive method is used;
Fig. 2 represents the forward travel of casting mold towards the zone that is provided with dry station;
Fig. 3 represents along the cutaway view of A-A line among Fig. 2;
Fig. 4 represents to insert the dry casting mold of filling the station, fills vacuum and extract system that the station has top seal plate, a side plate and is positioned at the bottom;
Fig. 5 is illustrated in the previous drawings after the top board that separates from casting mold and the side plate closure and is in the casting mold in casting stage;
Fig. 6 represents the casting mold that is full of and the cross gate of obstruction;
Fig. 7 is illustrated in casting ladle decompression and the cross gate end cool time taking-up of casting mold afterwards;
Fig. 8 is the view of expression a set of equipment, and casting mold is passed in its medium-length hole or duct, and bore operation carried out before casting metals;
Fig. 9 represents along the cutaway view of B-B line among Fig. 8;
Figure 10 is the front view of indication device, is made the deep hole that passes casting mold or the duct of Fig. 8,9 illustrated embodiments by this device.
As previously mentioned, the method that is used to make non-ferrous casting of the present invention is a dry casting mold before the casting motlten metal, to remove the moisture in the casting mold and to avoid producing micropipe in final foundry goods.
For this reason, shown in above-mentioned accompanying drawing, need make the casting mold of making 1 have many cavity or deep holes 2 that casting mold distributes that spread all over, these cavitys or deep hole 2 are made by a top base plate that has as drilling rod.Obviously, also can replace a base plate to manufacture described cavity or deep hole 2 with having top side plate, at this moment, the deep hole 2 of casting mold 1 be with horizontal distribution.
Prepared casting mold enters corresponding filling machine and is in the end of casting mold row, as shown in Figure 2, is provided with a dry station at this.The cavity of casting mold 1 or deep hole 2 make hot-air can flow to described deep hole or cavity 2 from the inner chamber 3 of each casting mold 1, described dry station accurately is provided with, to produce described hot air flow, dry station comprises a top cover 4 and keeps the side seal closing plate 5 of casting mold 1 sealing, and having set up a bottom catchments and priming reservoir 6, therefore, by being blown into hot-air through top cover 4 and 6 applying negative pressure or vacuum through the pond, the thermal air current that is produced will flow to cavity or deep hole 2 wherein from the inner chamber 3 of each casting mold 1, and take moisture contained in the casting mold to priming reservoir 6.This method can make the inwall drying of die cavity 3, thereby makes the cast outer surface of acquisition have surface smoothness preferably.
After described drying steps finishes, casting mold 1 will enter the casting station singly, as shown in Figure 1, and at this, casting mold 1 is placed on a top seal plate 7 by Driven by Hydraulic Cylinder, side plate 8 and between vacuum and extract system 9 of bottom, as shown in Figure 4.Casting mold 1 has the suitable running channel 10 facing to cross gate 11, accompanying drawing 4 expression casting ladles 12 lead to ladle, in this ladle, be provided with closure member 13, with plate 7,8 fixing hermetically reaching by after 12 pressurizations of 14 pairs of casting ladles of a pipeline, motlten metal will be cast in the casting mold 1, described pressurization can be finished by pneumatic or electromagnetic pump system, as shown in Figure 5, and in case be full of casting mold 1, cross gate 11 is just clogged by a stopper 15 that drives with hydraulic pressure or pneumatic cylinder 16, stopper 15 is limiting an inner chamber 17, air-flow or liquid stream flow through inner chamber 17 can make end 18 coolings, thereby make cross gate 10 rapid solidifications, remove casting mold 1 subsequently rapidly to begin a new circulation.
When the end cool time of cross gate 10 and casting ladle 12 decompressions, remove plate 7,8, so that casting mold 1 leaves the casting station and begins a new circulation.
In another embodiment, shown in Fig. 8,9,10, deep hole 2 ' passes casting mold 1 ', therefore casting mold 1 ' arrives motlten metal by the moulding chamber shown in Fig. 8 29 and fills station or casting station, and the section 18 at the casting station has the deep hole 2 ' that is through-hole form, as Fig. 8-10 knew expression, set through hole 2 ' had promoted the vacuum operation of whole casting mold 1 ', thereby can make motlten metal be full of all space, space or corners in the casting mold fully.
Through hole 2 ' is made by the device 19 that is illustrated among Fig. 8,10, this device comprise many its free end be provided with the drilling rod 29, motor 22 of apex point 21 and accordingly by belt pulley and tooth engagement with 23 transmission devices that constitute, therefore drilling rod 20 rotations also penetrate corresponding casting mold 1 ' by its apex point 21, obtain described deep hole 2 ' thus, shown in Fig. 8-10, in order to form these through holes or deep hole, drilling rod 20 need move up by a center piston 24, and by guide rod 25 auxiliary risings or decline.
Also be provided with a horizontal piston 26, it makes the position casting mold 1 ' variation arbitrarily relatively of drilling rod 20, so that form through hole 2 ' according to the geometrical property of casting mold in only position.
Support casting mold 1 ' and be provided with slotted hole 27 for its base that slides in the above in corresponding section 18, this hole can make drilling rod 20 pass and arrive each position that it can occupy.
Shown in Fig. 8,9, each casting mold 1 ' keeps sealing by top board 7 ' and side plate 8 ', also be provided with a vacuum house steward 28, can apply vacuum to promote the casting of motlten metal in casting mold by this pipe, fill its all gap, for this reason, vacuum is that the through hole 2 ' that crosses each casting mold 1 ' provides.
Claims (3)
1. a place is used for being produced by wet sand casting the method for non-ferrous casting, it is characterized in that, this method comprises the following steps:
-make and to have deep hole the greensand mold (1-1 ') of (2-2 '), this deep hole (2-2 ') can make hot air flow flow through to remove the moisture of damp sand, perhaps can reach vacuum and the gapped and groove of the institute of casting mold is filled;
-casting mold (1-1 ') is placed in the drying station that is arranged in the suitable casting machine, this drying station comprises a top cover (4) and side plate (5), they are used to make many casting molds (1-1 ') to keep each other sealing;
-apply negative pressure or vacuum by a priming reservoir, bottom (6), and be blown into hot-air simultaneously, make it to flow between the die cavity (3) in casting mold (1-1 ') casting mold deep hole (2-2 '), sucking-off moisture also is sent to pond, the end (6) with the water that separates;
-casting mold (1-1 ') being moved to suitable casting station after dry, this casting station comprises a top seal plate (7-7 '), side plate (8-8 ') and one vacuum and the extract system (9) bottom being positioned at;
-by being exerted pressure, casting ladle (12) fills type, the gas in the die cavity of casting mold (1-1 ') is extracted out simultaneously by bottom vacuum and extract system (9);
-after filling type, casting mold (1-1 ') use the stopper (15) that drives by a hydraulic cylinder (16) to stop up cross gate (10), simultaneously the inboard supply gas of the chamber (17) through stopper (15) in or liquid to be cooling off, and so the running channel (10) that leads to casting mold (1-1 ') is solidified;
-making casting ladle (12) decompression, the running channel (10) that keeps leading to casting mold (1-1 ') is blocked, and bleeds; And
-after finishing the cool time of the cross gate (10) that leads to casting mold (1-1 '), remove top board (7-7 ') and side plate (8-8 ') from the casting station, so that can remove casting mold and begin a new circulation.
2. method according to claim 1, it is characterized in that, described deep hole (2 ') passes completely through casting mold (1 ') and forms in section (18), described casting mold (1 ') is transported to motlten metal filling or casting station from corresponding moulding chamber (29) in section (18), described through hole (2 ') is formed by the corresponding free-ended apex point (21) that is arranged on drilling rod (20), and drilling rod (20) also vertically moves by a piston (24) when driving rotation by motor (22).
3. method according to claim 2, it is characterized in that, the position of drilling rod (20) casting mold (1 ') relatively changes, thereby supporting casting mold (1 ') and being provided with slotted hole (27) on the base of its slip, so that drilling rod (20) can pass each position that they can occupy.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES9800071 | 1998-01-16 | ||
| ES9800071A ES2143391B1 (en) | 1998-01-16 | 1998-01-16 | PROCEDURE FOR OBTAINING NON-IRON METAL PIECES THROUGH CASTING IN GREEN SAND MOLDS. |
| ES009802242A ES2156508B1 (en) | 1998-01-16 | 1998-10-26 | "PROCEDURE FOR OBTAINING NON-FERREAL METAL PARTS BY COLADA IN GREEN SAND MOLDS". |
| ES9802242 | 1998-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1227777A true CN1227777A (en) | 1999-09-08 |
Family
ID=26155116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99100403A Pending CN1227777A (en) | 1998-01-16 | 1999-01-15 | Process for obtaining non-ferrous metal castings by greensand mould casting |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3103345B2 (en) |
| KR (1) | KR19990067941A (en) |
| CN (1) | CN1227777A (en) |
| BR (1) | BR9900164A (en) |
| ES (1) | ES2156508B1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211140A (en) * | 2011-05-13 | 2011-10-12 | 无锡小天鹅精密铸造有限公司 | Casting mold for molding fine-deep hole and resin sand molding method thereof |
| CN102218505A (en) * | 2011-07-08 | 2011-10-19 | 嘉禾县众合铸业有限公司 | Precise casting technology for green sand vacuum sealing model |
| CN103028696A (en) * | 2011-09-28 | 2013-04-10 | 通用汽车环球科技运作有限责任公司 | Method for drilling in casting object |
| CN104057062A (en) * | 2012-08-27 | 2014-09-24 | 济南铸造锻压机械研究所有限公司 | Sand mold low-pressure casting pouring opening sealing device and sand mold low-pressure casting method |
| CN112548034A (en) * | 2021-01-07 | 2021-03-26 | 山东理工大学 | Casting sand mold, process and sand mold water content control system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103934435B (en) * | 2014-05-19 | 2017-01-04 | 海门市沪海有色铸造有限公司 | Method for solving problem of hot spot generated at wall thickness of aluminum alloy casting by using chilling coating and dark air hole in matched mode |
| JP6406617B2 (en) * | 2015-01-21 | 2018-10-17 | 日産自動車株式会社 | Low pressure casting method and low pressure casting apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2470651A1 (en) * | 1979-11-28 | 1981-06-12 | Merrien Pierre | METHOD AND DEVICE FOR AUTOMATING A HOT AIR DRYING CYCLE OF SAND MOLDS |
| US4620584A (en) * | 1985-05-24 | 1986-11-04 | Witt Raymond H | Green sand mold filling system |
| CN1099927C (en) * | 1995-09-08 | 2003-01-29 | 新东工业株式会社 | Casting equipment |
-
1998
- 1998-10-26 ES ES009802242A patent/ES2156508B1/en not_active Expired - Lifetime
-
1999
- 1999-01-15 BR BR9900164-0A patent/BR9900164A/en not_active Application Discontinuation
- 1999-01-15 CN CN99100403A patent/CN1227777A/en active Pending
- 1999-01-16 KR KR1019990001163A patent/KR19990067941A/en not_active Application Discontinuation
- 1999-01-18 JP JP11009345A patent/JP3103345B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211140A (en) * | 2011-05-13 | 2011-10-12 | 无锡小天鹅精密铸造有限公司 | Casting mold for molding fine-deep hole and resin sand molding method thereof |
| CN102218505A (en) * | 2011-07-08 | 2011-10-19 | 嘉禾县众合铸业有限公司 | Precise casting technology for green sand vacuum sealing model |
| CN103028696A (en) * | 2011-09-28 | 2013-04-10 | 通用汽车环球科技运作有限责任公司 | Method for drilling in casting object |
| CN104057062A (en) * | 2012-08-27 | 2014-09-24 | 济南铸造锻压机械研究所有限公司 | Sand mold low-pressure casting pouring opening sealing device and sand mold low-pressure casting method |
| CN104057062B (en) * | 2012-08-27 | 2016-01-20 | 济南铸造锻压机械研究所有限公司 | The method of sand mold low pressure casting shutoff gating apparatus and sand mold low pressure casting |
| CN112548034A (en) * | 2021-01-07 | 2021-03-26 | 山东理工大学 | Casting sand mold, process and sand mold water content control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3103345B2 (en) | 2000-10-30 |
| KR19990067941A (en) | 1999-08-25 |
| JPH11285781A (en) | 1999-10-19 |
| BR9900164A (en) | 2000-01-18 |
| ES2156508B1 (en) | 2002-02-01 |
| ES2156508A1 (en) | 2001-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |