GB2088763A - Machine for making shell moulds and cores - Google Patents
Machine for making shell moulds and cores Download PDFInfo
- Publication number
- GB2088763A GB2088763A GB8132759A GB8132759A GB2088763A GB 2088763 A GB2088763 A GB 2088763A GB 8132759 A GB8132759 A GB 8132759A GB 8132759 A GB8132759 A GB 8132759A GB 2088763 A GB2088763 A GB 2088763A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- blowing
- machine
- shooting unit
- cores
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
- B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/02—Compacting by pressing devices only
- B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Devices For Molds (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A machine for making shell moulds and cores by the charging or blowing process, using a fluid moulding material, more particularly a resin-coated sand provides an arrangement of the blowing and shooting unit and also of the mould tools to produce a shell moulding machine in which re-equipment does not disturb continuous operation and therefore avoiding a loss of production; moreover, mould boxes can be used whose width is uninfluenced by their depth, so as to enable a wider assortment of cores to be produced. To this end the machine consists of at least two mould sections (2) disposed at an angle to one another; the radial distance of each mould section from one point is identical and at that point a blowing and shooting unit (11) is disposed for cooperation with all the mould sections. Each mould section (2) may include core box halves (6) and (7), and the latter can be low- ered out of the machine. <IMAGE>
Description
SPECIFICATION
Machine for making shell moulds and cores
The invention relates to a machine for making shell moulds and cores by the charging or blowing process, using a fluid moulding material, more particularly a resin-coated sand.
German Offenlegungsschrift 1920799 discloses a machine for making shell moulds and cores in which two mould box halves are reciprocated relatively in the horizontal direction between a closed position and an opened position; in the closed position refractory material can be blown into the inside of the mould box, to form the core. After the core has been formed, the core box halves are moved apart. To enable the finished sand core to be manipulated more satisfactorily, one mould box half is mounted at its end face on a pivotable door, so that this mould box half can be swung over a horizontal arc out of the machine. The mould boxes are also mounted on a frame which is pivotable around a horizontal axis, to allow the blowing of the core and the return of the excess sand.The rotatable frame requires a large number of moving parts which impede access to the pivotable door disposed at the end face, so that the finished core is not as accessible as desired.
Moreover, in the afore-mentioned machine, the core is removed manually. With a view to simplified operation, it is desirable to deposit the core automatically on a conveying member for removing it; it should be so deposited from as small a height as possible.
Due to the pivoting movement of one mould box half through the end face of the machine, the available space cannot be completely occupied by the core box-i.e. it must be somewhat smaller in width and height. In addition, with increasing core box depth, these dimensions become further limited for the same reason, so that the width of the assortment of cores which can be produced is relatively limited.
In another machine for making shell moulds and cores (commercially available under the name Corobot), after a tensioning and separating device has been opened, one mould box half can be pivoted downwards out of the machine in order to deposit the core on a conveyer belt. Although the core box half is pivoted downwards, however, the distance between the conveyer belt and the downwardly pivoted core box half remains relatively large, so that the conveyor belt must also be raised, and this again creates increased costs.
The two machines above mentioned have a further decisive disadvantage. They enable shell moulds and cores to be produced in only one production plane-i.e. in either horizontally or vertically divided core boxes. When the machine is changed over to a different core box, considerable stoppages inevitably occur, which also cause cessation of production and therefore of products.
It is an object of this invention to reduce the stoppages and therefore losses during the changeover of shell mould machines from one production plane-i.e. dividing plane of the mould box-to another, and also to use mould boxes whose width is uninfluenced by their depth, so as to enable a wider assortment of cores to be produced.
Generally, therefore, the invention relates to the problem of providing a suitable arrangement of the blowing and shooting unit and also of the mould tools in order to produce a shell mould machine in which any changeover has a less disturbing effect on continuous operation, and in which the core box can be moved out of the machine in such a manner that the width of the core box remains uninfluenced by its depth.
To this end, according to the invention, a machine for making shell moulds and cores consists of two or more, i.e. several mould sections which are disposed at an angle to one another; the radial distance of each mould section from one point is identical; and at that point a blowing and shooting unit is disposed corresponding to all the mould sections. According to a further feature of the invention one of the mould box halves can be lowered out of the machine and can then be pivoted into a horizontal plane.
The blowing and shooting unit consists of the moulding material storage tank, the blowing or shooting cylinder and the shooting head, and preferably can be pivoted through up to 360 around a vertical axis. The pivoting angle depends on the number of mould sections used.
The blowing and shooting unit can also preferably be displaced normally to the pivoting direction and can be raised and lowered vertically. This arrangement enables mould and core boxes of different sizes to be used.
In a preferred arrangement, a system is disposed on the blowing and shooting unit for clamping the latter to the mould section, such system preventing the blowing and shooting unit from becoming displaced in relation to the mould section.
The mould section itself conveniently consists of four horizontal guide columns which receive a core box system, and can be pivoted through 180 in a retaining means by a drive.
The pivotable arrangement of the blowing and shooting unit enables a number of mould sections to be serviced using only one such unit; the production plane-i.e. the position of the dividing plane of the mould or core box-of each mould section can be different. Furthermore, the vertical displaceability of the blowing and shooting unit enables the differences in height to be evened out with the use of mould or core boxes of different sizes and dividing planes.
Advantageously the machine can be extended, without the necessity for any further blowing and shooting unit, by the addition of individual mould sections, and the machine itself can be used with only one mould section-i.e. the machine according to the invention enables mould sections to be added or removed without any alteration having to be made to the blowing and shooting unit.
The stoppages which take place with other machines if a changeover has to be made or maintenance carried out are eliminated in the machine according to the invention, since during such stoppages other mould sections can be operating. For the aforementioned reason, the invention also obviates the time otherwise lost after the blowing or shooting operation due to the sintering time and the removal of the shell mould or core.
Since the machine according to the invention has only one blowing and shooting unit, further advantages are a reduction in the number of wearing parts which have to be stored and also reduced maintenance costs.
The fact that the mould or core box half can be lowered and pivoted out of the machine enables the dimensions of the mould or core box to be extended as far as the inner sides of four guide columns of the mould sections, thus enabling the assortment of cores to be widened.
At the same time, this vertical movement of the core box half, in which the core remains, means that the core is delivered from a low ievel to a conveying device; this feature enables hollow and shell cores of widely varying contours to be produced.
The construction and operation of a machine in accordance with the invention for making shell moulds and cores will now be described with reference to an example having two mould sections, referring to the accompanying drawings, in which: Figure 1 is a plan view of a shell moulding machine, and
Figure 2 is a side elevation of the shell moulding machine.
Two mould sections 2 offset by 90 are disposed by end mountings on a machine frame 1. Each of the mould sections is also pivotally mounted by means of a further frame 3 at the opposite end. A drive 4 carried by the frame 3 drives the two mould sections 2 about the pivotal mounting.
A core box system 5 consisting of two core box halves 6, 7 and a central carriage 8 is disposed within the two mould sections 2.
One core box half 7 is mounted on the central carriage 8 on a lowering and pivoting system 9. The central carriage 8 is mounted for traversing movement on four guide spars 10 of the mould section 2. The core box can also be heated for performance of the so-called hot box process. One core box half 7 can be pivoted out of the mould section 2 by means of the lowering and pivoting system 9.
Disposed on the upper part of the machine frame 1 is a pivoting system 14 by means of which a blowing and shooting unit 11 can be moved to cooperate with the individual mould sections 2. Sliding bars 12 and a lowering system 1 3 attached thereto permit the blowing and shooting unit 11 to be longitudinally displaced and lowered, and therefore positioned in accordance with the arrangement of the core box system 5. The drive of the pivoting system 14 consists of a pivoting lever 1 5 combined with a conventional operating hydraulic ram 1 6. The blowing and shooting unit 11 is also displaceable longitudinally by a hydraulic operating ram 1 7 disposed in the centre, between the two sliding bars 1 2.
Disposed on the blowing and shooting unit 11 is a device 18 for clamping the latter to a particular mould section 2. The clamping device 1 8 prevents the blowing and shooting unit 11 from becoming displaced in relation to the core box system 5. The clamping device 1 8 and the lowering system 1 3 are actuated by a hydraulic operating ram 1 9 which on the one hand determines the end positions of the clamping device 18, and on the other hand lowers the blowing and shooting unit 11 to the core box system 5.
The moulding material delivery aperture below the blowing and shooting unit 11 has a shooting head 20, which also has a labyrinth, to prevent the fluid moulding material from trickiing out of the blowing and shooting unit 11. The moulding material is therefore forced by compressed air through the labyrinth into the core box system 5.
The shell moulding machine operates with the following cycle:
When the machine is started, the blowing and shooting unit 11 is moved by means of the pivoting system 14 and the sliding bars 1 2 to one of the two mould sections 2, in accordance with a given programme. The blowing and shooting unit 11 is then locked by the clamping device 1 8 on the guide spars
10 of the mould section 2. After locking has been carried out, the operation of locating the blowing and shooting unit 11 in contact pressure on the core box system 5 is triggered.
After the completion of the blowing and shooting operation, the blowing and shooting unit 11 is again pivotally moved, this time to the other mould section, offset by 90 . After a suitable sintering time, the whole mould section pivots through 180 , so that the moulding material which has not set trickles downwards out of the core box system 5 and is returned to the moulding material storage tank. A contact pressure cylinder 21 then moves the central carriage 8 so that the core box system 5 opens.The core box half 7 remains in the core, is moved downwards on guides 22 and is then pivoted out of the mould section 2 by the lowering and pivoting
SPECIFICATION
Machine for making shell moulds and cores
The invention relates to a machine for making shell moulds and cores by the charging or blowing process, using a fluid moulding material, more particularly a resin-coated sand.
German Offenlegungsschrift 1 920799 discloses a machine for making shell moulds and cores in which two mould box halves are reciprocated relatively in the horizontal direction between a closed position and an opened position; in the closed position refractory material can be blown into the inside of the mould box, to form the core. After the core has been formed, the core box halves are moved apart. To enable the finished sand core to be manipulated more satisfactorily, one mould box half is mounted at its end face on a pivotable door, so that this mould box half can be swung over a horizontal arc out of the machine. The mould boxes are also mounted on a frame which is pivotable around a horizontal axis, to allow the blowing of the core and the return of the excess sand.The rotatable frame requires a large number of moving parts which impede access to the pivotable door disposed at the end face, so that the finished core is not as accessible as desired.
Moreover, in the afore-mentioned machine, the core is removed manually. With a view to simplified operation, it is desirable to deposit the core automatically on a conveying member for removing it; it should be so deposited from as small a height as possible.
Due to the pivoting movement of one mould box half through the end face of the machine, the available space cannot be completely occupied by the core box-i.e. it must be somewhat smaller in width and height. In addition, with increasing core box depth, these dimensions become further limited for the same reason, so that the width of the assortment of cores which can be produced is relatively limited.
In another machine for making shell moulds and cores (commercially available under the name Corobot), after a tensioning and separating device has been opened, one mould box half can be pivoted downwards out of the machine in order to deposit the core on a conveyer belt. Although the core box half is pivoted downwards, however, the distance between the conveyer belt and the downwardly pivoted core box half remains relatively large, so that the conveyor belt must also be raised, and this again creates increased costs.
The two machines above mentioned have a further decisive disadvantage. They enable shell moulds and cores to be produced in only one production plane-i.e. in either horizontally or vertically divided core boxes. When the machine is changed over to a different core box, considerable stoppages inevitably occur, which also cause cessation of production and therefore of products.
It is an object of this invention to reduce the stoppages and therefore losses during the changeover of shell mould machines from one production plane-i.e. dividing plane of the mould box-to another, and also to use mould boxes whose width is uninfluenced by their depth, so as to enable a wider assortment of cores to be produced.
Generally, therefore, the invention relates to the problem of providing a suitable arrangement of the blowing and shooting unit and also of the mould tools in order to produce a shell mould machine in which any changeover has a less disturbing effect on continuous operation, and in which the core box can be moved out of the machine in such a manner that the width of the core box remains uninfluenced by its depth.
To this end, according to the invention, a machine for making shell moulds and cores consists of two or more, i.e. several mould sections which are disposed at an angle to one another; the radial distance of each mould section from one point is identical; and at that point a blowing and shooting unit is disposed corresponding to all the mould sections. According to a further feature of the invention one of the mould box halves can be lowered out of the machine and can then be pivoted into a horizontal plane.
The blowing and shooting unit consists of the moulding material storage tank, the blowing or shooting cylinder and the shooting head, and preferably can be pivoted through up to 360 around a vertical axis. The pivoting angle depends on the number of mould sections used.
The blowing and shooting unit can also preferably be displaced normally to the pivoting direction and can be raised and lowered vertically. This arrangement enables mould and core boxes of different sizes to be used.
In a preferred arrangement, a system is disposed on the blowing and shooting unit for clamping the latter to the mould section, such system preventing the blowing and shooting unit from becoming displaced in relation to the mould section.
The mould section itself conveniently consists of four horizontal guide columns which receive a core box system, and can be pivoted through 180 in a retaining means by a drive.
The pivotable arrangement of the blowing and shooting unit enables a number of mould sections to be serviced using only one such unit; the production plane-i.e. the position of the dividing plane of the mould or core box-of each mould section can be different. Furthermore, the vertical displaceability of the blowing and shooting unit enables the differences in height to be evened out with the use of mould or core boxes of different sizes and dividing planes.
Advantageously the machine can be extended, without the necessity for any further blowing and shooting unit, by the addition of individual mould sections, and the machine itself can be used with only one mould section-i.e. the machine according to the invention enables mould sections to be added or removed without any alteration having to be made to the blowing and shooting unit.
The stoppages which take place with other machines if a changeover has to be made or maintenance carried out are eliminated in the machine according to the invention, since during such stoppages other mould sections can be operating. For the aforementioned reason, the invention also obviates the time otherwise lost after the blowing or shooting operation due to the sintering time and the removal of the shell mould or core.
Since the machine according to the invention has only one blowing and shooting unit, further advantages are a reduction in the number of wearing parts which have to be stored and also reduced maintenance costs.
The fact that the mould or core box half can be lowered and pivoted out of the machine enables the dimensions of the mould or core box to be extended as far as the inner sides of four guide columns of the mould sections, thus enabling the assortment of cores to be widened.
At the same time, this vertical movement of the core box half, in which the core remains, means that the core is delivered from a low level to a conveying device; this feature enables hollow and shell cores of widely varying contours to be produced.
The construction and operation of a machine in accordance with the invention for making shell moulds and cores will now be described with reference to an example having two mould sections, referring to the accompanying drawings, in which: Figure 1 is a plan view of a shell moulding machine, and
Figure 2 is a side elevation of the shell moulding machine.
Two mould sections 2 offset by 90 are disposed by end mountings on a machine frame 1. Each of the mould sections is also pivotally mounted by means of a further frame 3 at the opposite end. A drive 4 carried by the frame 3 drives the two mould sections 2 about the pivotal mounting.
A core box system 5 consisting of two core box halves 6, 7 and a central carriage 8 is disposed within the two mould sections 2.
One core box half 7 is mounted on the central carriage 8 on a lowering and pivoting system 9. The central carriage 8 is mounted for traversing movement on four guide spars 10 of the mould section 2. The core box can also
be heated for performance of the so-called hot
box process. One core box half 7 can be
pivoted out of the mould section 2 by means
of the lowering and pivoting system 9.
Disposed on the upper part of the machine
frame 1 is a pivoting system 14 by means of
which a blowing and shooting unit 11 can be
moved to cooperate with the individual mould
sections 2. Sliding bars 1 2 and a lowering
system 1 3 attached thereto permit the blow
ing and shooting unit 11 to be longitudinally
displaced and lowered, and therefore posi
tioned in accordance with the arrangement of
the core box system 5. The drive of the
pivoting system 14 consists of a pivoting lever 1 5 combined with a conventional operating
hydraulic ram 16. The blowing and shooting
unit 11 is also displaceable longitudinally by a
hydraulic operating ram 1 7 disposed in the
centre, between the two sliding bars 1 2.
Disposed on the blowing and shooting unit
11 is a device 1 8 for clamping the latter to a
particular mould section 2. The clamping de
vice 1 8 prevents the blowing and shooting
unit 11 from becoming displaced in relation
to the core box system 5. The clamping
device 18 and the lowering system 1 3 are
actuated by a hydraulic operating ram 1 9 which on the one hand determines the end
positions of the clamping device 18, and on
the other hand lowers the blowing and shoot
ing unit 11 to the core box system 5.
The moulding material delivery aperture be
low the blowing and shooting unit 11 has a
shooting head 20, which also has a labyrinth,
to prevent the fluid moulding material from
trickling out of the blowing and shooting unit
11. The moulding material is therefore forced
by compressed air through the labyrinth into
the core box system 5.
The shell moulding machine operates with
the following cycle:
When the machine is started, the blowing
and shooting unit 11 is moved by means of
the pivoting system 14 and the sliding bars 1 2 to one of the two mould sections 2, in
accordance with a given programme. The blowing bowing and shooting unit 11 is then locked by the clamping device 18 on the guide spars
10 of the mould section 2. After locking has
been carried out, the operation of locating the
blowing and shooting unit 11 in contact pres
sure on the core box system 5 is triggered.
After the completion of the blowing and
shooting operation, the blowing and shooting
unit 11 is again pivotally moved, this time to
the other mould section, offset by 90 . After a
suitable sintering time, the whole mould sec
tion pivots through 180 , so that the mould
ing material which has not set trickles down
wards out of the core box system 5-and is
returned to the moulding material storage
tank. A contact pressure cylinder 21 then
moves the central carriage 8 so that the core
box system 5 opens. The core box half 7
remains in the core, is moved downwards on
guides 22 and is then pivoted out of the mould section 2 by the lowering and pivoting system 9, so that the core can be delivered to a vertically adjustable conveying system 23.
Claims (7)
1. A machine for making shell moulds and cores by a charging or blowing process, using a fluid moulding material, more particularly a resin-coated sand, wherein the machine consists of at least two mould sections which are disposed at an angel to one another; the radial distance of each mould section from a single point being identical; and at said point a blowing and shooting unit is disposed to enable cooperation thereof with all the mould sections.
2. A machine according to claim 1, wherein the blowing and shooting unit can be pivoted around a vertical axis extending through said point.
3. A machine according to claim 2, wherein the pivotal radius of the blowing and shooting unit can be varied.
4. A machine according to any of claims 1-3, wherein the blowing and shooting unit can be displaced vertically through said point.
5. A machine according to any of claims 1-4, wherein the blowing and shooting unit carries a device for clamping the unit to the mould section.
6. A machine according to any of claims 1-5, wherein one of the mould box sections can be lowered out of the machine and can then be pivoted into a horizontal plane.
7. A machine for making shell moulds and cores substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD22571580A DD154336A1 (en) | 1980-12-04 | 1980-12-04 | MACHINE FOR MANUFACTURING MASK FORMS AND CORE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2088763A true GB2088763A (en) | 1982-06-16 |
| GB2088763B GB2088763B (en) | 1985-03-27 |
Family
ID=5527613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8132759A Expired GB2088763B (en) | 1980-12-04 | 1981-10-30 | Machine for making shell moulds and cores |
Country Status (6)
| Country | Link |
|---|---|
| DD (1) | DD154336A1 (en) |
| DE (1) | DE3141986C2 (en) |
| GB (1) | GB2088763B (en) |
| HU (1) | HU183649B (en) |
| PL (1) | PL233510A1 (en) |
| YU (1) | YU245681A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3405420A1 (en) * | 1983-11-08 | 1985-05-15 | Rheinische Maschinenfabrik & Eisengiesserei Anton Röper GmbH & Co KG, 4060 Viersen | DEVICE FOR CHANGING TOOLS IN FOUNDRY MACHINES |
| DE3444342A1 (en) * | 1984-12-05 | 1986-06-05 | Adolf Hottinger, Gießerei und Maschinenbau GmbH, 6800 Mannheim | DEVICE FOR BOWLING MASKS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3520347A (en) * | 1968-04-29 | 1970-07-14 | Acme Cleveland Corp | Foundry machine with swinging door for core removal |
-
1980
- 1980-12-04 DD DD22571580A patent/DD154336A1/en unknown
-
1981
- 1981-10-13 YU YU245681A patent/YU245681A/en unknown
- 1981-10-20 PL PL23351081A patent/PL233510A1/xx unknown
- 1981-10-22 DE DE19813141986 patent/DE3141986C2/en not_active Expired
- 1981-10-28 HU HU316981A patent/HU183649B/en unknown
- 1981-10-30 GB GB8132759A patent/GB2088763B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3141986A1 (en) | 1982-07-08 |
| DE3141986C2 (en) | 1983-11-17 |
| PL233510A1 (en) | 1982-07-19 |
| HU183649B (en) | 1984-05-28 |
| GB2088763B (en) | 1985-03-27 |
| DD154336A1 (en) | 1982-03-17 |
| YU245681A (en) | 1983-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |