CA1107029A - Vacuum metal die-casting apparatus - Google Patents
Vacuum metal die-casting apparatusInfo
- Publication number
- CA1107029A CA1107029A CA295,023A CA295023A CA1107029A CA 1107029 A CA1107029 A CA 1107029A CA 295023 A CA295023 A CA 295023A CA 1107029 A CA1107029 A CA 1107029A
- Authority
- CA
- Canada
- Prior art keywords
- die
- vacuum
- plate
- casting
- chamber housing
- 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.)
- Expired
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Abstract of the Disclosure A vacuum apparatus comprises a frame which carries two vertical plates with a mobile plate being mounted in guides therebetween. One part of a die or half-die is rigidly fixed on the mobile plate by means of a die holder telescopically connected to a vacuum casting chamber housing rigidly mounted on a stationary plate that carries the other half-die. Air-tight seals are provided at the housing joints; the housing is provided with viewing ports and with a means for cleaning a die cavity.
Such constructional arrangement of the apparatus has made it possible to improve quality of cast metal blanks.
Such constructional arrangement of the apparatus has made it possible to improve quality of cast metal blanks.
Description
7~Z9 B~CKGROU~D OF THE INVENTION
_ 1. Field of the Invention The invention relates to ~oundry practice, and more particularly to vacuum metal die-casting apparatus intended preferably for producing precision castings from refractory and highly reactive metals and alloys, such as those based on titanium or zirconium.
_ 1. Field of the Invention The invention relates to ~oundry practice, and more particularly to vacuum metal die-casting apparatus intended preferably for producing precision castings from refractory and highly reactive metals and alloys, such as those based on titanium or zirconium.
2. Description of the Prior Art British Patent Specification No. 914,508 discloses a me~al die-casting apparatus which comprises a frame-mounted air-tight housing common to both a melting and a casting chamber. Enclosed in said common housing are two stationary vertical plates interconnected by guide columns. Mounted in the guide columns is a mobile plate provided with a reciprocat-ing drive means. Arranged inside said air-tight housing is an electrode holder mounted over a crucible for rotation about a horizontal axis and provided with a drive means for actuating said rotation.
Underneath the crucible is a funnel placed in the pouring orifice of a pressure chamber housing.
The pressure chamber housing is built into a stationary plate which carries one half of a die, the second half thereof being secured to a mobile plate. The pressure chamber incor-porates a means for forced supply of metal into the die, said means being basically a piston secured to a piston rod of a hydraulic cylinder.
It is a makker of practical knowledge that when metal is forced into the die, there is no sufficient rigidity of ~7~
connection between the two hal~-dies so that ~lash is ~ormed at the parting planes of the die, the casting then losing in accuracy of shape.
Further development of machine-building industry breeds higher demands for a lar~e amount of metal die-cast blanks. Particularly severe problems are encountered in known apparatus for die casting precision blanks from titanium- or zirconium-based alloys. A solution to these problems is a currently central necessity.
SUMM~RY OF THE INVE~TIO~
It is, there~ore, an object of the invention to pro-vide a vacuum metal die casting apparatus which will improve the quality of castings.
Another no less important object o~ the invention is to enhance the operating reliability of such apparatus.
These and other objects are attained by the provision o~ a vacuum metal die casting apparatus comprising a frame whereon are mounted two stationary vertical plates interconnec-ted by horizontal guide columns wherein is accommodated a mobile plate carrying one half of a die, the second half o~ said die being rigidly connected to a stationary plate wherein are built a pressure chamber housing and a die gate both communicat-ing with the die cavity, and having a means for a forced supply of metal through the pressure chamber into the die, according to the invention, one o~ the hal~-dies being held in position by a die holder telescopically connected to a casting chamber housing rigidly attached to the stationary plate and provided with air-tight seals and with a viewing port.
. ~
.
-~ 7~9 As the casting chamber housing is built of telescopi-cally connected parts rigidly attached to vertical plates, it accurately positions th~ mobile plate when the liquid metal is forced into the die. Air-tight seals make it possible to remove castings from the cavity of the die without depressurizing the apparatus, to reduce the overall dimensions of the vacuum cham-ber and to locate externally with respect to the latter both a drive means for actuating the mobile plate and a thrusting hinged mechanism. The viewing port in the housing facilitates the operation of the die and makes it possible to check visually the casting of metal blanks and their quality.
It is advantageous to attach a means for cleaning the die cavity to the vacuum casting chamber housing with the aid of a spherical pivot and to form said means with a rod carrying a detachable actuating tool. This makes possible to clean the castin~ die without depressurizing the casting chamber and thus improves the quality of castings, i.e., makes them as close as is practically possible to the ideal shape.
BRIEF DESCRIPTIO~ OF TME DRAWI~GS
~hese and other objects and features of the invention become readily apparent from one embodiment thereof which will now be described by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a side elevational view of the apparatus with exploded views and a partial longitudinal cross-section along a vertical plane;
FIG. 2 is the same part of the apparatus, top plan view with a partial longitudinal cross-section along a horizontal
Underneath the crucible is a funnel placed in the pouring orifice of a pressure chamber housing.
The pressure chamber housing is built into a stationary plate which carries one half of a die, the second half thereof being secured to a mobile plate. The pressure chamber incor-porates a means for forced supply of metal into the die, said means being basically a piston secured to a piston rod of a hydraulic cylinder.
It is a makker of practical knowledge that when metal is forced into the die, there is no sufficient rigidity of ~7~
connection between the two hal~-dies so that ~lash is ~ormed at the parting planes of the die, the casting then losing in accuracy of shape.
Further development of machine-building industry breeds higher demands for a lar~e amount of metal die-cast blanks. Particularly severe problems are encountered in known apparatus for die casting precision blanks from titanium- or zirconium-based alloys. A solution to these problems is a currently central necessity.
SUMM~RY OF THE INVE~TIO~
It is, there~ore, an object of the invention to pro-vide a vacuum metal die casting apparatus which will improve the quality of castings.
Another no less important object o~ the invention is to enhance the operating reliability of such apparatus.
These and other objects are attained by the provision o~ a vacuum metal die casting apparatus comprising a frame whereon are mounted two stationary vertical plates interconnec-ted by horizontal guide columns wherein is accommodated a mobile plate carrying one half of a die, the second half o~ said die being rigidly connected to a stationary plate wherein are built a pressure chamber housing and a die gate both communicat-ing with the die cavity, and having a means for a forced supply of metal through the pressure chamber into the die, according to the invention, one o~ the hal~-dies being held in position by a die holder telescopically connected to a casting chamber housing rigidly attached to the stationary plate and provided with air-tight seals and with a viewing port.
. ~
.
-~ 7~9 As the casting chamber housing is built of telescopi-cally connected parts rigidly attached to vertical plates, it accurately positions th~ mobile plate when the liquid metal is forced into the die. Air-tight seals make it possible to remove castings from the cavity of the die without depressurizing the apparatus, to reduce the overall dimensions of the vacuum cham-ber and to locate externally with respect to the latter both a drive means for actuating the mobile plate and a thrusting hinged mechanism. The viewing port in the housing facilitates the operation of the die and makes it possible to check visually the casting of metal blanks and their quality.
It is advantageous to attach a means for cleaning the die cavity to the vacuum casting chamber housing with the aid of a spherical pivot and to form said means with a rod carrying a detachable actuating tool. This makes possible to clean the castin~ die without depressurizing the casting chamber and thus improves the quality of castings, i.e., makes them as close as is practically possible to the ideal shape.
BRIEF DESCRIPTIO~ OF TME DRAWI~GS
~hese and other objects and features of the invention become readily apparent from one embodiment thereof which will now be described by way of example with reference to the accompanying drawings, in which:
FIG. 1 is a side elevational view of the apparatus with exploded views and a partial longitudinal cross-section along a vertical plane;
FIG. 2 is the same part of the apparatus, top plan view with a partial longitudinal cross-section along a horizontal
- 3 -~..
~73~
plane.
DESCRIPTIO~ OF TEE PREFERRED EMBODIME~T
A metal die casting apparatus has a frame 1 (FIG. 1) whereon are rigidly attached two vertical plates 2 and 3 inter-connected by horizontal guide columns ~ (FIG. 2) wherein is mounted for reciprocation under the action of a drive means 6 a third mobile plate S.
Rigidly mounted on the stationary plate 3 (FIG. 1) is an air-tight housing 7 of a vacuum casting chamber 8. Said plate 3 separates the vacuum casting chamber 8 of the apparatus from a vacuum melting chamber 9. A housing 10 of a pressure chamber 11 is built into the vertical stationary plate 3 and connected to a gate 12 communicating with the pressure chamber 11 and a cavity 13 of the die 14.
The pressure chamber 11 is fitted with a means 15 for forced supply of metal into the die 14. Said means 15 incox-porates a hydraulic cylinder 17 with a rod 18 entering the pressure chamber 11, said hydraulic cylinder being supported by a leg 16~
One half-die 19 is rigidly fastened to the stationary vextical plate 3, whereas the second hal-die 20, to a die holder 21 rigidly mounted on the mobile plate 5.
The improvement in the vacuum die casting apparatus, according to the invention, consists in that the vacuum casting chamber 8 has its own air-tight housiny 7 attached, on the one hand, to the stationary plate 3 and telescopically connected, on the other hand, to the die holder 21 set rigidly on the mobile plate 5. Air-tight seals 22 are provided at the joints of the '~' ' 3q~
housing 7~
The housing 7 of the vacuum casting chamber 8 is fitted with viewing ports 23 ~FIG. 2) and with ports 25 incor-porating covers 24 for servicing the die 14. A hopper 26 is provided or storing finished metal castings (FIG. 1).
A hydraulic cylinder ~7 with a rod 28 cooperati.ng with a pusher 29 entering the cavity 13 of the die 14 and facilitating the removal of a finished metal casting (not shown on the drawings) is attached, externally with respect to the vacuum casting chamber 8, to the vertical mobile plate 5.
For cleaning the cavity 13 of the die 14, the appara-tus is provided with a means having a rod 31 with a detachahle actuating tool 32, e.g., a scraper, said means being attached to the housing 7 of the vacuum casting chamber 8 with the aid of a spherical pivot 30.
The vacuum metal die casting apparatus according to the invention operates as follows.
Vacuum is built up in the vacuum melting 9 (FIG. 1) and the casting 8 chambers by means of a vacuum plant (not shown on the drawing). The drive me~ns 6 is energized to actuate the plate 5 and ensure an air-tight closing of the halves of the die 14.
The apparatus is supplied with electric current to melt an amount of metal sufficient to cast a specified number of castings, the liquid metal then being transferred to the pressure chamber 11, whereupon a hydraulic cylinder 17 is energized, its rod 18 forcing a portion of metal into the cavity 13 of the die 14. This portion of metal is held for a predetermined time in the die until the cas ting solidi~ies.
A ~inished casting is removed from the cavity 13 of the die 14 by energizing the drive means 6 to move the plate 5 in the reverse direction and so open the half-dies of the die 14, the die holder 21 re~aining within the enclosure of the vacuum seals 22 of the casting chamber 8. When the mobile plate 5 is backed away from the stationary plate 3, the hydraulic cylinder 17 is energized, its rod 18 pushes out of the gate 12 the solidified excess portion of the metal, and the casting, from the half-die 19 o~ the die 14 built into the stationary plate 3. Should the casting fail to ~all out of the die 14, it is pushed out by the pusher 29 which is actuated by the rod 28 of the hydraulic cylinder 27, the casting then slid-ing into the hopper 26 of the vacuum casting chamber 8.
~ ext, the cavity 13 of the die 14 is cleaned of splashes of metal by a scraper 32 fastened to the rod 31 of the aforesaid cleaning means and reaching any area of said cavity.
Once the half-dies of the die 14 are cleaned, the latter is closed by the action of the drive means 6 which moves the mobile plate 5 toward the stationary plate 3~
This terminates the operating cycle of the apparatus.
To repeat the operating cycle of the apparatus, it is not necessary to depressurize the latter, since, as has been experi-mentally found, the apparatus, according to the invention, can operate faultlessly for a Long period of time and ensure a high quality of castings.
;~ - 6 -
~73~
plane.
DESCRIPTIO~ OF TEE PREFERRED EMBODIME~T
A metal die casting apparatus has a frame 1 (FIG. 1) whereon are rigidly attached two vertical plates 2 and 3 inter-connected by horizontal guide columns ~ (FIG. 2) wherein is mounted for reciprocation under the action of a drive means 6 a third mobile plate S.
Rigidly mounted on the stationary plate 3 (FIG. 1) is an air-tight housing 7 of a vacuum casting chamber 8. Said plate 3 separates the vacuum casting chamber 8 of the apparatus from a vacuum melting chamber 9. A housing 10 of a pressure chamber 11 is built into the vertical stationary plate 3 and connected to a gate 12 communicating with the pressure chamber 11 and a cavity 13 of the die 14.
The pressure chamber 11 is fitted with a means 15 for forced supply of metal into the die 14. Said means 15 incox-porates a hydraulic cylinder 17 with a rod 18 entering the pressure chamber 11, said hydraulic cylinder being supported by a leg 16~
One half-die 19 is rigidly fastened to the stationary vextical plate 3, whereas the second hal-die 20, to a die holder 21 rigidly mounted on the mobile plate 5.
The improvement in the vacuum die casting apparatus, according to the invention, consists in that the vacuum casting chamber 8 has its own air-tight housiny 7 attached, on the one hand, to the stationary plate 3 and telescopically connected, on the other hand, to the die holder 21 set rigidly on the mobile plate 5. Air-tight seals 22 are provided at the joints of the '~' ' 3q~
housing 7~
The housing 7 of the vacuum casting chamber 8 is fitted with viewing ports 23 ~FIG. 2) and with ports 25 incor-porating covers 24 for servicing the die 14. A hopper 26 is provided or storing finished metal castings (FIG. 1).
A hydraulic cylinder ~7 with a rod 28 cooperati.ng with a pusher 29 entering the cavity 13 of the die 14 and facilitating the removal of a finished metal casting (not shown on the drawings) is attached, externally with respect to the vacuum casting chamber 8, to the vertical mobile plate 5.
For cleaning the cavity 13 of the die 14, the appara-tus is provided with a means having a rod 31 with a detachahle actuating tool 32, e.g., a scraper, said means being attached to the housing 7 of the vacuum casting chamber 8 with the aid of a spherical pivot 30.
The vacuum metal die casting apparatus according to the invention operates as follows.
Vacuum is built up in the vacuum melting 9 (FIG. 1) and the casting 8 chambers by means of a vacuum plant (not shown on the drawing). The drive me~ns 6 is energized to actuate the plate 5 and ensure an air-tight closing of the halves of the die 14.
The apparatus is supplied with electric current to melt an amount of metal sufficient to cast a specified number of castings, the liquid metal then being transferred to the pressure chamber 11, whereupon a hydraulic cylinder 17 is energized, its rod 18 forcing a portion of metal into the cavity 13 of the die 14. This portion of metal is held for a predetermined time in the die until the cas ting solidi~ies.
A ~inished casting is removed from the cavity 13 of the die 14 by energizing the drive means 6 to move the plate 5 in the reverse direction and so open the half-dies of the die 14, the die holder 21 re~aining within the enclosure of the vacuum seals 22 of the casting chamber 8. When the mobile plate 5 is backed away from the stationary plate 3, the hydraulic cylinder 17 is energized, its rod 18 pushes out of the gate 12 the solidified excess portion of the metal, and the casting, from the half-die 19 o~ the die 14 built into the stationary plate 3. Should the casting fail to ~all out of the die 14, it is pushed out by the pusher 29 which is actuated by the rod 28 of the hydraulic cylinder 27, the casting then slid-ing into the hopper 26 of the vacuum casting chamber 8.
~ ext, the cavity 13 of the die 14 is cleaned of splashes of metal by a scraper 32 fastened to the rod 31 of the aforesaid cleaning means and reaching any area of said cavity.
Once the half-dies of the die 14 are cleaned, the latter is closed by the action of the drive means 6 which moves the mobile plate 5 toward the stationary plate 3~
This terminates the operating cycle of the apparatus.
To repeat the operating cycle of the apparatus, it is not necessary to depressurize the latter, since, as has been experi-mentally found, the apparatus, according to the invention, can operate faultlessly for a Long period of time and ensure a high quality of castings.
;~ - 6 -
Claims (2)
1. A vacuum metal die casting apparatus comprising: a frame; two vertical stationary plates attached to said frame;
horizontal guide column interconnecting said vertical stationary plates; a mobile vertical plate slidably mounted between said horizontal guide columns; a reciprocating drive means geared to said mobile plate; a die holder rigidly secured to said mobile plate; a die, one half thereof being rigidly connected to said die holder, and the other half thereof, to the vertical station-ary plate separating the casting chamber from the melting chamber; a vacuum casting chamber housing rigidly mounted on the vertical stationary plate carrying one half of the die and telescopically connected to said die holder; air-tight seals at points of attachment and at telescopic joints of said vacuum casting chamber housing; a viewing port in said vacuum casting chamber housing; a pressure chamber housing built into a verti-cal stationary plate and connected through a gate to the cavity of said die; a means for forced feeding of metal through said pressure chamber into said die.
horizontal guide column interconnecting said vertical stationary plates; a mobile vertical plate slidably mounted between said horizontal guide columns; a reciprocating drive means geared to said mobile plate; a die holder rigidly secured to said mobile plate; a die, one half thereof being rigidly connected to said die holder, and the other half thereof, to the vertical station-ary plate separating the casting chamber from the melting chamber; a vacuum casting chamber housing rigidly mounted on the vertical stationary plate carrying one half of the die and telescopically connected to said die holder; air-tight seals at points of attachment and at telescopic joints of said vacuum casting chamber housing; a viewing port in said vacuum casting chamber housing; a pressure chamber housing built into a verti-cal stationary plate and connected through a gate to the cavity of said die; a means for forced feeding of metal through said pressure chamber into said die.
2. A vacuum metal die casting apparatus as claimed in claim 1, wherein attached on said vacuum casting chamber housing with the aid of a spherical pivot is a means for cleaning the die cavity, said means being a rod carrying a fastened thereto detachable actuating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA295,023A CA1107029A (en) | 1978-01-16 | 1978-01-16 | Vacuum metal die-casting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA295,023A CA1107029A (en) | 1978-01-16 | 1978-01-16 | Vacuum metal die-casting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1107029A true CA1107029A (en) | 1981-08-18 |
Family
ID=4110552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,023A Expired CA1107029A (en) | 1978-01-16 | 1978-01-16 | Vacuum metal die-casting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1107029A (en) |
-
1978
- 1978-01-16 CA CA295,023A patent/CA1107029A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |