WO1995015235A1 - Die casting machine - Google Patents
Die casting machine Download PDFInfo
- Publication number
- WO1995015235A1 WO1995015235A1 PCT/GB1994/002640 GB9402640W WO9515235A1 WO 1995015235 A1 WO1995015235 A1 WO 1995015235A1 GB 9402640 W GB9402640 W GB 9402640W WO 9515235 A1 WO9515235 A1 WO 9515235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base
- die casting
- nozzle
- casting machine
- machine
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
- B22D17/04—Plunger machines
Definitions
- This invention relates to a die casting machine, and in particular to an "inclined”, pressure die casting machine.
- the pressure die casting machine is considered in two parts; the "mould side” refers to the platens, tie bars and dies, the “injection side” refers to the reservoir for the molten metal, the nozzle, the gooseneck, and the plunger and ram assembly for delivering the molten metal to the mould.
- Pressure die casting is the injection of molten metal or plastic under high pressure into a mould cavity.
- the following description concerns apparatus and method to produce metal castings; the apparatus and method to form plastics castings is similar.
- the mould Prior to injection of the molten metal into the cavity, the mould is "closed” i.e. the two halves of the mould, called dies, are brought together; thereafter the dies are held together whilst the molten metal is forced into the cavity they form. The metal is allowed to solidify, to the shape of the mould cavity; and then the dies are pulled apart so that the solidified object can be ejected and the cycle repeate .
- known apparatus utilises a die casting machine which has one die mounted upon a fixed platen, so that it remains stationary relative to the machine, and the second die is mounted to a movable platen, so that it is movable into and out of engagement with the fixed die.
- the movable platen has the movement and control apparatus; the fixed platen has the injection apparatus.
- Aluminium and copper alloys which attack and erode machine parts with which they are in constant contact are usually made in a so-called cold chamber machine, whilst tin, lead and zinc die castings are usually produced in a so-called hot chamber machine.
- This invention will principally be used on a hot chamber pressure die casting machine, and the use on such a machine is discussed below.
- a class of hot chamber machines hereinafter referred to as "inclined" pressure die casting machines are becoming increasingly common.
- the mould side is mounted to the machine base at an incline (typically five degrees), the fixed platen being lower than the movable platen.
- the standard injection-efficient conical form of the nozzle requires that the nozzle may not only be separated from, but also brought together with, the fixed platen along the path of its axis i.e. at the inclined angle of the machine.
- a second requirement for pressure die casting machines is a facility for alteration in the vertical position of the nozzle relative to the fixed platen i.e. relative to the dies. Some moulds require central molten metal injection, whereas other moulds require below-centre molten metal injection.
- Known inclined pressure die casting machines achieve the first and second requirements outlined above by moving the mould side, whilst the injection side, including the nozzle, remains stationary relative to the machine base.
- the fixed platen In order to access the nozzle, for repair or replacement, the fixed platen must be moved. In the known machines this is achieved by moving not just the fixed platen, but the whole of the mould side of the machine.
- the first and second fixed platens are mounted upon inclined rails, so that these platens, the tie bars connected therebetween, and the movable platen carried by the tie bars, can be moved, as a single unit, towards and away from the nozzle.
- the second requirement is achieved in the known machines by having a machine base to which the injection side and the mould side are independently connected; the mould side, mounted upon its inclined rails, can be moved vertically up or down relative to the injection side, as required.
- This again has the disadvantage that the movement of a large and heavy section of the machine is necessary, and must be strictly controlled.
- Another disadvantage is that the independent connections of the injection side and the mould side to the machine base must be essentially rigid, since the high pressure of molten metal entering the mould will act to force the injection side away from the mould side.
- an inclined pressure die casting machine having a base, securement means for mounting a set of dies, movement means for moving the dies relative to one another, a reservoir for molten metal, and an injection means for injecting molten metal between the dies, characterised by driving means for moving the injection means relative to the base, the driving means having a first part fixed relative to the machine base and a second part engageable with a part of the injection means.
- the injection means comprises an injection unit mounted upon at least one carrier.
- the injection unit comprises a plunger, a ram assembly, a gooseneck and a nozzle; in use the ram assembly acts upon the plunger to force molten metal around the gooseneck and through the nozzle.
- the injection unit is mounted upon a pair of carriers, one carrier being to each side of the injection unit, each carrier being slidably engaged by a fabricated assembly fixed relative to the machine base, the carrier and fabricated assembly having sliding engagement parts oriented at the inclined angle of the machine.
- the driving means comprises a pair of piston and cylinder assemblies and pair of levers, the piston rod of each piston and cylinder assembly being connected to one of the opposed ends of a respective lever, the other of the opposed ends of the lever engaging one of the carriers, each lever being pivotable about an axis between its opposed ends.
- the cylinder is secured to the machine base. Whilst the piston and cylinder assemblies are usefully hydraulic, pneumatic operation is alternatively possible.
- the injection unit is mountable upon the carriers at a plurality of (vertically) spaced positions, so that the injection unit may be mounted at differing (vertical) positions relative to the carrier, and thus relative to the machine base.
- Fig.l is a schematic side view of an inclined pressure die casting machine
- Fig.2 is a side view, partly in section, of part of the machine of Fig.l
- Fig.3 is a fabricated assembly for the machine of Fig.l.
- Fig.4 is an end view of part of the injection unit.
- the pressure die casting machine 10 of Fig.l comprises an end wall carrying a first fixed platen 12, a second fixed platen 14, and a movable platen 16. Rigidly connected between the fixed platens 12,14 are tie bars 20, upon which the movable platen is slidably guided.
- the movement means of this embodiment is a toggle mechanism 22 arranged between the first fixed platen 12 and the movable platen 16, and which drive the movable platen towards and away from the second fixed platen 14 in known fashion.
- the dies are replaceably attached by securement means (not shown).
- first die 24 attached to the movable platen
- second die 26 attached to the second fixed platen.
- the molten metal is contained in a reservoir 30; an injection unit 32, comprising a ram assembly 42, a plunger 40, a gooseneck 44 and a nozzle 46 (Fig.2), is adapted to force molten metal into the mould cavity, in known fashion.
- the "mould side” comprises the fixed platens 12,14, the movable platen 16, the tie bars 20, toggle mechanism 22, and the fitted dies 24,26;
- the “injection side” comprises the reservoir 30, the ram assembly 42, plunger 40, gooseneck 44 and nozzle 46.
- the machine 10 has a inclined mould side, i.e. the mould side is at an inclined angle ⁇ to the horizontal, and to the injection side.
- the reservoir 30 contains the molten metal to be cast; the reservoir though shown open can be a covered container.
- the molten metal will flow through aperture 34 into chamber 36; in this preferred embodiment the aperture 34 is below the surface level of the molten metal, so that floating scum and the like is inhibited from entering the chamber 36.
- a plunger 40 driven downwardly by ram assembly 42, forces molten metal around the gooseneck 44, through the nozzle 46, and into the mould (not shown in this figure).
- the injection unit 32 comprising the nozzle 46, gooseneck 44, and ram assembly 42, is mounted upon a carrier 50, the carrier having a projecting portion 52 (see also Fig.4) inclined at the angle ⁇ to the machine base 11 i.e. to the horizontal.
- the projecting portion 52 has a lateral recess 54, which accepts one end 60 of an operating lever 62.
- the body part of carrier 50 receives the lever 62.
- the lever can rotate about pivot 63, which is secured to a bracket 64; the bracket 64 is fixed relative to the machine as described below.
- the arcuate movement of the lever end engaging the recess 54 can follow the inclined movement of projecting portion 52 so that this projecting portion can be of reduced vertical dimension.
- the opposed end of the lever 62 is pivotally connected to a piston rod 66, the piston of which is slidably mounted inside a hydraulic operating cylinder 68 positioned adjacent the upper edge of the second fixed platen 14, and thus is secured to the machine base 11. It will be understood that the cylinder 68 is some distance above the reservoir 30, and so is substantially unaffected by heat (radiant and convective) from the molten metal contained therein.
- the piston and cylinder assembly and lever comprise the driving means, the cylinder 68 being the first part of the driving means, connected to the machine base 11, the end 60 of the lever 62 being the second part, engageable with the carrier 50 of the injection means.
- a fabricated assembly 70 (Fig.3) is secured to each side of the fixed platen 14, one to either side of the injection unit (see Fig.4).
- Each fabricated assembly carries a channel member 72 with a channel 73 inclined at the angle ⁇ , and adapted to be slidably engaged by the projection 52 of the injection unit.
- the channel member 72 is secured to the fabricated assembly 70 by recessed bolts 74; in an alternative embodiment, the channel member is welded to the fabricated assembly; and in yet a further embodiment the recessed bolts 74 secure a low friction material to the channel member, to assist in the sliding movement of the projection 52.
- the fabricated assembly 70 carries the bracket 64 to which the lever 62 is pivotally attached; in other embodiments, the bracket is secured directly to the machine base. It will be understood therefore that the only structural connection between the injection unit and the remainder of the machine is by way of the pair of inclined projections
- the reservoir 30 is not part of the injection unit, i.e. it is connected to the machine base and not to the carrier 50.
- the lower portion of the injection unit (the chamber 36 and part of the gooseneck 44), is submerged in the reservoir, and free to move therein (between predetermined limits of travel).
- each carrier 50 has two recesses 76 in its face opposed to the projection 52.
- the recesses 76 are of square section, and are sized to accept a lip 78 attached to a part of the ram assembly 42.
- the opposed lips 78 can be located respectively in either of the facing pair of recesses 76, so that the hydraulic ram assembly, and thus the injection unit, can be mounted at a different vertical position relative to the carrier. This may be necessary if a different second fixed platen or second die is used, with the nozzle required to enter the mould at a different height. In other embodiments, more recesses 76 can be provided, as required.
- pressure is required to be maintained in the hydraulic operating cylinder 68 in order to retain the nozzle 46 in its normal condition i.e. in engagement with and/or projecting through the second fixed platen 14; the pressure required may be considerable, for instance to withstand the forces from molten metal in the mould, and the piston seals may leak without the operator becoming aware of this failure.
- the injection unit after positioning may be locked into position e.g. into the normal "moulding" position shown in Fig.2, as by bolts securing the injection unit relative to the machine base; the hydraulic operating cylinder is in this embodiment only required to be placed under pressure for nozzle maintenance or replacement.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU11153/95A AU1115395A (en) | 1993-12-03 | 1994-12-02 | Die casting machine |
EP95902217A EP0682573A1 (en) | 1993-12-03 | 1994-12-02 | Die casting machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939324820A GB9324820D0 (en) | 1993-12-03 | 1993-12-03 | Die casting machine |
GB9324820.1 | 1993-12-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995015235A1 true WO1995015235A1 (en) | 1995-06-08 |
Family
ID=10746080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1994/002640 WO1995015235A1 (en) | 1993-12-03 | 1994-12-02 | Die casting machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0682573A1 (en) |
AU (1) | AU1115395A (en) |
GB (1) | GB9324820D0 (en) |
WO (1) | WO1995015235A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108526435A (en) * | 2018-07-05 | 2018-09-14 | 佛山市南海鸿镁压铸机械有限公司 | Engine base group and die casting machine for clamping transmission |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3777943A (en) * | 1972-04-24 | 1973-12-11 | Diemakers Inc | Gooseneck valve arrangement for diecasting machine |
US4219068A (en) * | 1979-05-30 | 1980-08-26 | Dynacast International Limited | Die casting machine |
US4261414A (en) * | 1979-03-21 | 1981-04-14 | Techmire Ltee. | Die casting machine |
-
1993
- 1993-12-03 GB GB939324820A patent/GB9324820D0/en active Pending
-
1994
- 1994-12-02 WO PCT/GB1994/002640 patent/WO1995015235A1/en not_active Application Discontinuation
- 1994-12-02 AU AU11153/95A patent/AU1115395A/en not_active Abandoned
- 1994-12-02 EP EP95902217A patent/EP0682573A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3777943A (en) * | 1972-04-24 | 1973-12-11 | Diemakers Inc | Gooseneck valve arrangement for diecasting machine |
US4261414A (en) * | 1979-03-21 | 1981-04-14 | Techmire Ltee. | Die casting machine |
US4219068A (en) * | 1979-05-30 | 1980-08-26 | Dynacast International Limited | Die casting machine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108526435A (en) * | 2018-07-05 | 2018-09-14 | 佛山市南海鸿镁压铸机械有限公司 | Engine base group and die casting machine for clamping transmission |
CN108526435B (en) * | 2018-07-05 | 2024-04-05 | 伟台机械有限公司 | Machine seat group for driving die closing mechanism and die casting machine |
Also Published As
Publication number | Publication date |
---|---|
GB9324820D0 (en) | 1994-01-19 |
EP0682573A1 (en) | 1995-11-22 |
AU1115395A (en) | 1995-06-19 |
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