CA1181222A - Pattern withdrawing device in foundry plants - Google Patents
Pattern withdrawing device in foundry plantsInfo
- Publication number
- CA1181222A CA1181222A CA000376319A CA376319A CA1181222A CA 1181222 A CA1181222 A CA 1181222A CA 000376319 A CA000376319 A CA 000376319A CA 376319 A CA376319 A CA 376319A CA 1181222 A CA1181222 A CA 1181222A
- Authority
- CA
- Canada
- Prior art keywords
- molding
- pattern
- pattern withdrawing
- bearing
- molding box
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C19/00—Components or accessories for moulding machines
-
- 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
Abstract
Abstract:
A pattern withdrawing device applied to molder machines set up in foundry plants wherewith a bearing plane for molding boxes is obtained, which bearing plane consists of self-aligning support elements aim-ing at eliminating all risks of breakage or "tearing"
of the mold when this is shaken out, which risks arise from the uncertain bearing condition of deformed molding boxes on usual rigid bearing planes.
A pattern withdrawing device applied to molder machines set up in foundry plants wherewith a bearing plane for molding boxes is obtained, which bearing plane consists of self-aligning support elements aim-ing at eliminating all risks of breakage or "tearing"
of the mold when this is shaken out, which risks arise from the uncertain bearing condition of deformed molding boxes on usual rigid bearing planes.
Description
3~8~2 Pattern withdrawing device in foundry plants.
The present invention relates to a pattern withdrawing device in plants and molding machines for use in foundries and, in particular, in those types of plants in which the molding boxes are automakically conveyed to the molding stations and hence to the following working stations. In the relevant molding station the model plate pushes, from beneath, the molding box upwards, which box on reaching a certain height, is locked and filled up with sand, which will then be tamped by the usual means.
The molding being thus carried out, the model plate goes down together with the molding box, stopping when reaching the height of the transport plane.
The model plate keeps on going down, thus starting the real pattern withdrawing operation; at the end of which the molding box resumes its travel away from the molding station, which will be subsequently occupied by a new molding box.
The operations described so far are characteristic of equipment already known in the art. However, the con-
The present invention relates to a pattern withdrawing device in plants and molding machines for use in foundries and, in particular, in those types of plants in which the molding boxes are automakically conveyed to the molding stations and hence to the following working stations. In the relevant molding station the model plate pushes, from beneath, the molding box upwards, which box on reaching a certain height, is locked and filled up with sand, which will then be tamped by the usual means.
The molding being thus carried out, the model plate goes down together with the molding box, stopping when reaching the height of the transport plane.
The model plate keeps on going down, thus starting the real pattern withdrawing operation; at the end of which the molding box resumes its travel away from the molding station, which will be subsequently occupied by a new molding box.
The operations described so far are characteristic of equipment already known in the art. However, the con-
2~ tinuous use of the molding boxes causes their deformation,due in particular to the high temperatures they are submitted to during the casting operations.
Thus it happens often enough that after a certain number of utilizations, owing to said deformations, the ~8~;~ZZ "
lower surface of the molding bow does no longer fit itself perfectly to the bearing plane consisting of the pattern withdrawing rollers (or push rods~ of the transport plane of the molding station.
Owing to this uncertain bearing condition, when the pattern withdrawing operation starts, the molding box is impelled to take a different bearing position on the rollers. This relative displacement between molded box and model exerts a certain stress on the tamped sand causing, on certain occasions, the breakage (tearing) of the less resistant parts and of those parts the pattern withdrawing of which arises some problems. So as to avoid this inconvenience, the bearing surface oE the molding boxes was periodically submitted to grinding operations aiming at restoring their coplanar conditions. These operations, besides the cost involved, reduced, in the long run, and in an unacceptable way, the height dimen-sions of the molding boxes, which were consequently rejected and substituted.
On account of the high unit cost of the molding boxes and of the consequent production losses, it became necessary to study a different solution of the problem.
This constitutes the purpose of the present invention.
The technical problem to solve in order to attain the purpose stated above was to create a new uniform bearing plane for the strained molding boxes, i.e. a plane capable to fit by itself, whenever necessary, to any possible deforrnation suffered by the bearing plane of the molding boxes~
~he solution of the technical problem is characterized by the introduction of four hydraulic cylinders with pistons so operated as to constitute self~aligning bearing elements so as to adapt thernselves to the molding boxes during their pattern withdrawing operation, together with a simultaneous locking system of said pistons to stop the motion of the molding boxes in connection with the model 2~
holding table which, while pursuing its travel downwards, carries out the pattern withdrawing operation correctly.
Further features and advantages will become evident from the description of a preferred realization of the invention and from the drawings attached hereto, in which:
Fig. 1 is a schematic and perspective view of the equipment including the device constituting the object of the present invention;
Fig. 2 is a plane view of the equipment of Fig. l;
Figs. 3 and 4 show a deta,il of Fig. 1 and Fig. 5 shows the pneumatic plan referring to the operation of the equipment being the object of the invention.
In Fig. 1 we have denoted with the number 10 a molding box consisting of four vertical walls 12 and of two frames, an upper one 14 and a lower one 15 delimiting the lateral walls. By sectioning the molding box into vertical planes in parallel with the transversal and longitudinal axes of the molding box, the contouring walls would appear in the shape of a "C".
This configuration depends on the transfer s~stem of the molding boxes, which transfer takes place on roller guides 16.
During its travel towards the molding station, the box rests on said rollers with the lowe'r surface of the upper frame 14 and it is pushed on same conveying rollers by some special arms operated pneumaticall~. Nearhy the rnolding s-tation the roller walls are shaped with the rollers arranged according to a lower line in such a way as to impel the molding box to rest on them with the lower surface of the lower Erame ]5 (Fig. 2) and to be able to make the vertical translations recluirecl by the molding ancl pattern withdrawing operations, as illustrated on the following pages.
In the molding station there is the model bearing table 1~, which is provicled with two vertical pins 20 to Eit into the corresponding holes 22 provided on the frames 14 and 15 of the molding box 10.
The part bearing table 18 is rigidly connected with the shank 24 of a piston 26 sliding in a simple effect pneuma-tic cylinder (Fig. 5) and it follows the motions of the shank, being guided and supported by the body 29. Connec-ted with the internal walls of plates 30 (Fig. 2) there are four small cylinders 32 provided with the relevant small pistons 34l the function of which will be illustrated in detail on the following pages (Figs. 1 and 5).
Connectecl hy means of the rod 36 with the model bearing table 18 there is a cam 38 operating, by its very motion, some special valves controlling the subsequent phases of the molding and pattern withdrawing cycles, as is specif-ied more in detail in the description of the pneumatic operating plan. With reference to Figs. 3 and 4, we give now the description of one of the four cylinders 32.
In the upper part of it there is piston 34, which is hydraulically operated. The operating oil, gathered in the tanks 102 and 108 (Fig. 5), reaches the cylinder from below through hole 42 (Fig. 3), a circular chamber 44, ducts 46, hole 48, and hole 50 (Fig. 4). In the lower part the cylinder is provided with a shutter device to prevent the flowing of the oil and, lastly, the piston 34 in a given position.
This device consists of a small piston 52 sliding inside a bushing 54 and ending up as a truncated cone ~itting into an opening 56, which connects duct 46 with hole 48. The opposite side of the small piston 52 is connected with air intake 60 connected, in its t~lrn, with the pneumatic equipment operating the whole pattern with-drawing equipment.
In cylinder 32 (Fig. 3) there is also a duc-t 62 to convey the oil in the upper part of the cylinder throuqh hole 64 to move the piston downwards.
We illustrate hereunder the working of the device which is the object of the invention with reference to Fig. 5 in which, for simplicity's sake, we have shown only the elements directly involved in the working of said device. To understand said working it is sufficient to bear in mind that lines 153 and 153' represent the general air feeding whereas lines 149 and 151 are connected with the remaining pneumatic circuit; line 151 is under pres-sure in the lifting phase of the model bearing table 18 and in relief in the lowering phase of same, whereas line 149 is in relief in the lifting phase and under pressure in the lowering phase. When molding box 10 reaches the molding station, it is enabled to send a pneumatic signal of comrnunication to a pre-working valve 150 through way 151. This valve 150 by communicating itself links the general air feed network 153 with the pilot of a valve 154, which commutes itself and sends to cylinder 25 the air which pushes piston 26, the model bearing table 18 and molding box 10 positioned above it upwards.
When table 18, in its travel upwards, reaches a height at which its cam 38 commutes valve 166, a pneumatic signal of commutation is sent to valve 100, which is connected with the main feed network 153'; consequently the compres-sed air reaches tank 102 compelling the oil in 102, in duct 104 and in cylinder 32 to push the pattern withdrawing pistons 34 upwards.
Having reached the upper end position of its travel, the model bearing 18 operates, by means of cam 38, the valve 168. This commutes itself and sends the air coming from line 151 to the pilot valve 170, commuting it.
The air arrives at double-acting cylinder 173 thus pushing piston 175 to the left and operating the mechanical block 177 of shaft 2~ of piston 26. The molding box 10 is thus secured to its sand loading and tamping position for the molding operation.
At the end of this operation there is the starting of z the descent phase: valve 168 gets discharged through way 151, which enters into its discharging phase, and valve 170 gets commuted through line 149, which gets activated to send the air to cylinder 173, in order to urge piston 175 to the right and release piston 26. At the end of its travel, piston 175 commutes valve 1~4 and, consequently, the air reaches, from line 149, the pilot of valve 150 which, getting itself commuted, puts valve 154 in a dis-charge condition. In the absence of the feed to piston 26, this along with molding box 10 and the model bearing table 18, starts its descent pulled down by the force of gravity. At the beginning of its descent travel, the model bearing table 18, with cam 38, leaves valve 166, which gets commuted and removes the air from tank 102.
The molding box 10 lies down, in its descent, on pat-tern withdrawing pistons 34, which get self-aligned and build up a safe support for the molding box.
At the end of a travel of about 100 mm, cam 38 operates valve 180, which sends a pneumatic signal to commutation valve 182. The air reaches connection 60 ~Fig. 4) through feed line 106, thus operating the oil stopping device 51.
Piston 52 (Fig. 4) is pushed against surface 56 and it closes the oil duct. The molding box is thus locked and supported by four pads of the oil contained between locking piston 52 and piston 34 (Fig. 4).
The model bearing table 18 continues going down, thus carrying out the pattern withdrawing operation in the most favourable conditions without any danger of provoking tears in the weaker spots of the mold.
When reaching its lowest position, cam 38 leaves the pilot lever oE valve 180, so that valve 182 gets commuted again on the discharge phase, thus bringing again the oil stopping device 51 in a non operating condition.
In this condition valve 164 is commuted, which valve commutes in its turn valve 110, which sends air from line 153' to tank 108.
Thus it happens often enough that after a certain number of utilizations, owing to said deformations, the ~8~;~ZZ "
lower surface of the molding bow does no longer fit itself perfectly to the bearing plane consisting of the pattern withdrawing rollers (or push rods~ of the transport plane of the molding station.
Owing to this uncertain bearing condition, when the pattern withdrawing operation starts, the molding box is impelled to take a different bearing position on the rollers. This relative displacement between molded box and model exerts a certain stress on the tamped sand causing, on certain occasions, the breakage (tearing) of the less resistant parts and of those parts the pattern withdrawing of which arises some problems. So as to avoid this inconvenience, the bearing surface oE the molding boxes was periodically submitted to grinding operations aiming at restoring their coplanar conditions. These operations, besides the cost involved, reduced, in the long run, and in an unacceptable way, the height dimen-sions of the molding boxes, which were consequently rejected and substituted.
On account of the high unit cost of the molding boxes and of the consequent production losses, it became necessary to study a different solution of the problem.
This constitutes the purpose of the present invention.
The technical problem to solve in order to attain the purpose stated above was to create a new uniform bearing plane for the strained molding boxes, i.e. a plane capable to fit by itself, whenever necessary, to any possible deforrnation suffered by the bearing plane of the molding boxes~
~he solution of the technical problem is characterized by the introduction of four hydraulic cylinders with pistons so operated as to constitute self~aligning bearing elements so as to adapt thernselves to the molding boxes during their pattern withdrawing operation, together with a simultaneous locking system of said pistons to stop the motion of the molding boxes in connection with the model 2~
holding table which, while pursuing its travel downwards, carries out the pattern withdrawing operation correctly.
Further features and advantages will become evident from the description of a preferred realization of the invention and from the drawings attached hereto, in which:
Fig. 1 is a schematic and perspective view of the equipment including the device constituting the object of the present invention;
Fig. 2 is a plane view of the equipment of Fig. l;
Figs. 3 and 4 show a deta,il of Fig. 1 and Fig. 5 shows the pneumatic plan referring to the operation of the equipment being the object of the invention.
In Fig. 1 we have denoted with the number 10 a molding box consisting of four vertical walls 12 and of two frames, an upper one 14 and a lower one 15 delimiting the lateral walls. By sectioning the molding box into vertical planes in parallel with the transversal and longitudinal axes of the molding box, the contouring walls would appear in the shape of a "C".
This configuration depends on the transfer s~stem of the molding boxes, which transfer takes place on roller guides 16.
During its travel towards the molding station, the box rests on said rollers with the lowe'r surface of the upper frame 14 and it is pushed on same conveying rollers by some special arms operated pneumaticall~. Nearhy the rnolding s-tation the roller walls are shaped with the rollers arranged according to a lower line in such a way as to impel the molding box to rest on them with the lower surface of the lower Erame ]5 (Fig. 2) and to be able to make the vertical translations recluirecl by the molding ancl pattern withdrawing operations, as illustrated on the following pages.
In the molding station there is the model bearing table 1~, which is provicled with two vertical pins 20 to Eit into the corresponding holes 22 provided on the frames 14 and 15 of the molding box 10.
The part bearing table 18 is rigidly connected with the shank 24 of a piston 26 sliding in a simple effect pneuma-tic cylinder (Fig. 5) and it follows the motions of the shank, being guided and supported by the body 29. Connec-ted with the internal walls of plates 30 (Fig. 2) there are four small cylinders 32 provided with the relevant small pistons 34l the function of which will be illustrated in detail on the following pages (Figs. 1 and 5).
Connectecl hy means of the rod 36 with the model bearing table 18 there is a cam 38 operating, by its very motion, some special valves controlling the subsequent phases of the molding and pattern withdrawing cycles, as is specif-ied more in detail in the description of the pneumatic operating plan. With reference to Figs. 3 and 4, we give now the description of one of the four cylinders 32.
In the upper part of it there is piston 34, which is hydraulically operated. The operating oil, gathered in the tanks 102 and 108 (Fig. 5), reaches the cylinder from below through hole 42 (Fig. 3), a circular chamber 44, ducts 46, hole 48, and hole 50 (Fig. 4). In the lower part the cylinder is provided with a shutter device to prevent the flowing of the oil and, lastly, the piston 34 in a given position.
This device consists of a small piston 52 sliding inside a bushing 54 and ending up as a truncated cone ~itting into an opening 56, which connects duct 46 with hole 48. The opposite side of the small piston 52 is connected with air intake 60 connected, in its t~lrn, with the pneumatic equipment operating the whole pattern with-drawing equipment.
In cylinder 32 (Fig. 3) there is also a duc-t 62 to convey the oil in the upper part of the cylinder throuqh hole 64 to move the piston downwards.
We illustrate hereunder the working of the device which is the object of the invention with reference to Fig. 5 in which, for simplicity's sake, we have shown only the elements directly involved in the working of said device. To understand said working it is sufficient to bear in mind that lines 153 and 153' represent the general air feeding whereas lines 149 and 151 are connected with the remaining pneumatic circuit; line 151 is under pres-sure in the lifting phase of the model bearing table 18 and in relief in the lowering phase of same, whereas line 149 is in relief in the lifting phase and under pressure in the lowering phase. When molding box 10 reaches the molding station, it is enabled to send a pneumatic signal of comrnunication to a pre-working valve 150 through way 151. This valve 150 by communicating itself links the general air feed network 153 with the pilot of a valve 154, which commutes itself and sends to cylinder 25 the air which pushes piston 26, the model bearing table 18 and molding box 10 positioned above it upwards.
When table 18, in its travel upwards, reaches a height at which its cam 38 commutes valve 166, a pneumatic signal of commutation is sent to valve 100, which is connected with the main feed network 153'; consequently the compres-sed air reaches tank 102 compelling the oil in 102, in duct 104 and in cylinder 32 to push the pattern withdrawing pistons 34 upwards.
Having reached the upper end position of its travel, the model bearing 18 operates, by means of cam 38, the valve 168. This commutes itself and sends the air coming from line 151 to the pilot valve 170, commuting it.
The air arrives at double-acting cylinder 173 thus pushing piston 175 to the left and operating the mechanical block 177 of shaft 2~ of piston 26. The molding box 10 is thus secured to its sand loading and tamping position for the molding operation.
At the end of this operation there is the starting of z the descent phase: valve 168 gets discharged through way 151, which enters into its discharging phase, and valve 170 gets commuted through line 149, which gets activated to send the air to cylinder 173, in order to urge piston 175 to the right and release piston 26. At the end of its travel, piston 175 commutes valve 1~4 and, consequently, the air reaches, from line 149, the pilot of valve 150 which, getting itself commuted, puts valve 154 in a dis-charge condition. In the absence of the feed to piston 26, this along with molding box 10 and the model bearing table 18, starts its descent pulled down by the force of gravity. At the beginning of its descent travel, the model bearing table 18, with cam 38, leaves valve 166, which gets commuted and removes the air from tank 102.
The molding box 10 lies down, in its descent, on pat-tern withdrawing pistons 34, which get self-aligned and build up a safe support for the molding box.
At the end of a travel of about 100 mm, cam 38 operates valve 180, which sends a pneumatic signal to commutation valve 182. The air reaches connection 60 ~Fig. 4) through feed line 106, thus operating the oil stopping device 51.
Piston 52 (Fig. 4) is pushed against surface 56 and it closes the oil duct. The molding box is thus locked and supported by four pads of the oil contained between locking piston 52 and piston 34 (Fig. 4).
The model bearing table 18 continues going down, thus carrying out the pattern withdrawing operation in the most favourable conditions without any danger of provoking tears in the weaker spots of the mold.
When reaching its lowest position, cam 38 leaves the pilot lever oE valve 180, so that valve 182 gets commuted again on the discharge phase, thus bringing again the oil stopping device 51 in a non operating condition.
In this condition valve 164 is commuted, which valve commutes in its turn valve 110, which sends air from line 153' to tank 108.
Claims (3)
1. A pattern withdrawing device in plants and molding machines for use in foundries comprising a transport system of the molding boxes by rollers, a model holding table in the molding and pattern withdrawing station seated under molding box and suitable to couple therewith to make vertical displacements upward and downwards, char-acterized in that it is provided with a support surface formed by self-aligning elements for replacing the usual bearing plane of the molding box formed by the conveying rollers during the pattern withdrawing process.
2. A pattern withdrawing device according to claim 1, characterized in that said elements forming the bearing plane are formed by four hydraulic cylinders whose pistons are actuated to form self-aligning bearing elements relative to the molding box during its descent phase, blocking means of said pistons being provided to stop the molding box movement relative to the model bearing table which, keeping its downward stroke on, makes the pattern withdrawing operation.
3. A pattern withdrawing device according to claims 1 and 2, characterized by the fact that said blocking means of the pistons in a determined position are formed by a piston sliding inside a bushing forming a unique piece with every one of the said hydraulic cylinders, said piston having one end so shaped as to act as a shutter device to prevent the flowing of the oil feeding said cylinders.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT42910A/80 | 1980-05-12 | ||
| IT8042910A IT1209784B (en) | 1980-05-12 | 1980-05-12 | FORMING DEVICE IN FOUNDRY PLANTS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181222A true CA1181222A (en) | 1985-01-22 |
Family
ID=11254635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000376319A Expired CA1181222A (en) | 1980-05-12 | 1981-04-27 | Pattern withdrawing device in foundry plants |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS577353A (en) |
| AU (1) | AU6968681A (en) |
| CA (1) | CA1181222A (en) |
| CH (1) | CH645045A5 (en) |
| DE (1) | DE3118102A1 (en) |
| DK (1) | DK209281A (en) |
| FR (1) | FR2481966A1 (en) |
| GB (1) | GB2076325A (en) |
| IT (1) | IT1209784B (en) |
| SE (1) | SE8102807L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117282946B (en) * | 2023-11-03 | 2024-03-01 | 泰州市锦峰新材料科技有限公司 | Shakeout equipment for metal castings |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR441830A (en) * | 1912-03-27 | 1912-08-17 | Jean Etienne Georges Bermond | Demoulding device with automatic candle adjustment |
| FR983613A (en) * | 1948-12-09 | 1951-06-26 | Fischer Ag Georg | Chassis Lift Rod Molding Machine |
| BE517880A (en) * | 1952-02-25 |
-
1980
- 1980-05-12 IT IT8042910A patent/IT1209784B/en active
-
1981
- 1981-04-21 AU AU69686/81A patent/AU6968681A/en not_active Abandoned
- 1981-04-27 CA CA000376319A patent/CA1181222A/en not_active Expired
- 1981-05-05 CH CH291581A patent/CH645045A5/en not_active IP Right Cessation
- 1981-05-05 SE SE8102807A patent/SE8102807L/en not_active Application Discontinuation
- 1981-05-07 DE DE19813118102 patent/DE3118102A1/en not_active Withdrawn
- 1981-05-07 GB GB8113948A patent/GB2076325A/en not_active Withdrawn
- 1981-05-11 FR FR8109332A patent/FR2481966A1/en active Granted
- 1981-05-11 JP JP6949781A patent/JPS577353A/en active Pending
- 1981-05-12 DK DK209281A patent/DK209281A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS577353A (en) | 1982-01-14 |
| SE8102807L (en) | 1981-11-13 |
| CH645045A5 (en) | 1984-09-14 |
| DE3118102A1 (en) | 1982-03-18 |
| FR2481966B1 (en) | 1984-11-02 |
| AU6968681A (en) | 1981-11-19 |
| IT1209784B (en) | 1989-08-30 |
| FR2481966A1 (en) | 1981-11-13 |
| GB2076325A (en) | 1981-12-02 |
| IT8042910A0 (en) | 1980-05-12 |
| DK209281A (en) | 1981-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |