WO2014158098A1 - Boring of sand cores from castings - Google Patents
Boring of sand cores from castings Download PDFInfo
- Publication number
- WO2014158098A1 WO2014158098A1 PCT/SI2014/000015 SI2014000015W WO2014158098A1 WO 2014158098 A1 WO2014158098 A1 WO 2014158098A1 SI 2014000015 W SI2014000015 W SI 2014000015W WO 2014158098 A1 WO2014158098 A1 WO 2014158098A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sand
- casting
- castings
- boring
- air
- 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
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/006—Removing cores by abrasive, water or air blasting
Definitions
- the object of the invention is a method for decoring sand cores from various castings either of non-ferrous metals and their alloys or ferrous alloys.
- the invention allows decoring from hot castings immediately after casting or after process of hardening is completed.
- the currently known technology does not allow it.
- the technology allows decoring of all types of sand cores: Cold box, Hot box, Croning, and cores with inorganic binders. Major advantages of the process are:
- the castings are subject to serial control and finalization as early as half an hour after the casting procedure.
- the method is ecologically friendlier. Decoring is performed immediately after casting and dissimilation of binders is finished within a relatively short period of time. Owing to air blowing the sand gets cold rapidly.
- Vibration a casting is clamped in a dedicated clamping device, and then it is hammered with pneumatic hammers to achieve cracks on the core. Then follows vibration of castings.
- the solution is protected by several patents: FR2850890, US2006272792, FR2901161, EP0326138, EP0325928, WO2004067209, WO2007132101, FR2711931, US4718473, FR2730436, EP0111461, FR2699840, US4722386, DE2947795, DE3219390, EP0304683, WQ9721523, FR2655895, W09213663, US5213150, JP63235063, GB2067938, DE3319312 and is rather problematic because of the following:
- castings are collected into batches - palettes due to optimal costs of operation. This requires an additional intermediate storage area and a delay of further production phases for at least 16 to 24 hours.
- a dedicated hollow tool (2) is used in boring of sand cores, which tool crushes the centre of a sand core (3) by rotation and translation into the inside of a casting (1); air flows under the pressure from inlet holes (4) on the tool and flows through the holes towards a ceramic plate (5) directly to the place of sand crushing; the blown air removes the sand in direction outside a casting (7), and on the way out the mixture of air and sand removes the remaining core and .cleans the surface.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A dedicated hollow tool is used in boring of sand cores, which tool crushes the centre of a sand core by rotation and translation into the inside of a casting. Air under pressure flows to an edge of a crushing plate directly to the place of sand crushing. The air removes the sand in direction outside the casting, and on the way out the mixture of air and sand removes the remaining core and cleans the surface,
Description
BORING OF SAND CORES FROM CASTINGS
The object of the invention is a method for decoring sand cores from various castings either of non-ferrous metals and their alloys or ferrous alloys.
The invention allows decoring from hot castings immediately after casting or after process of hardening is completed. The currently known technology does not allow it. The technology allows decoring of all types of sand cores: Cold box, Hot box, Croning, and cores with inorganic binders. Major advantages of the process are:
- Simple device for decoring is needed.
- Less expensive device for decoring is needed.
- No additional labour force is needed. Decoring can be performed at the same working place as casting.
- No sand blasting of castings is needed. Castings are devoid of remains of the core.
- A smaller amount of castings in the intermediate storage area between the casting phase and the decoring phase.
- Improved supervision and quality control of the process due to a rapid result and consequently less scrap. The castings are subject to serial control and finalization as early as half an hour after the casting procedure.
- The method is ecologically friendlier. Decoring is performed immediately after casting and dissimilation of binders is finished within a relatively short period of time. Owing to air blowing the sand gets cold rapidly.
- After decoring the sand is completely crushed. No additional crushing or preparation for further operation is needed.
- The inner surface of a casting is clean and no remaining sand is bonded. Additional sand blasting due to core remains is not needed.
The currently known technological solutions to decoring are based on two principles:
1. Vibration: a casting is clamped in a dedicated clamping device, and then it is hammered with pneumatic hammers to achieve cracks on the core. Then follows
vibration of castings. The solution is protected by several patents: FR2850890, US2006272792, FR2901161, EP0326138, EP0325928, WO2004067209, WO2007132101, FR2711931, US4718473, FR2730436, EP0111461, FR2699840, US4722386, DE2947795, DE3219390, EP0304683, WQ9721523, FR2655895, W09213663, US5213150, JP63235063, GB2067938, DE3319312 and is rather problematic because of the following:
- Castings must be completely cooled down before decoring. This requires additional intermediate storage area and a delay of further production phases for at least 8 to 16 hours.
- Danger of cracks.
- Danger of damages on castings due to clamping.
- High maintenance costs of the device because the device is self-destructive due to high forces at vibration.
- Particles of sand remain on the surface of a casting which need to be removed by sand blasting.
2. Thermal decomposition: castings are heated in a furnace at 400 °C for 4 to 6 hours which causes thermal decomposition of the binder (phenol resins). After the thermal decomposition procedure the sand must be emptied from the castings. The solution is protected by several patents US3989227, WO9730805 and is rather problematic because of the following :
- Before being thermally decomposed, castings are collected into batches - palettes due to optimal costs of operation. This requires an additional intermediate storage area and a delay of further production phases for at least 16 to 24 hours.
- Particles of sand remain on the surface of a casting that need to be removed by sand blasting.
- Energy and financially wasteful procedure.
Description of the method for boring sand cores from castings
A dedicated hollow tool (2) is used in boring of sand cores, which tool crushes the centre of a sand core (3) by rotation and translation into the inside of a casting (1); air
flows under the pressure from inlet holes (4) on the tool and flows through the holes towards a ceramic plate (5) directly to the place of sand crushing; the blown air removes the sand in direction outside a casting (7), and on the way out the mixture of air and sand removes the remaining core and .cleans the surface.
Claims
1. A technological method for boring sand cores is characterized in that
- a tool (2) crushes the centre of a sand core (3)
- air flow is allowed through the hollow tool (2) to the crushed sand (5),
- the air that comes through the holes (5) washes ff the sand from the crushing (6) site in direction (7) through the casting (1),
- a mixture of air and sand removes the remains of the core on the walls of the casting and cleans the walls of the casting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SIP-201300077 | 2013-03-29 | ||
| SI201300077A SI24307A (en) | 2013-03-29 | 2013-03-29 | Boring of sand cores from castings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014158098A1 true WO2014158098A1 (en) | 2014-10-02 |
Family
ID=50555232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SI2014/000015 WO2014158098A1 (en) | 2013-03-29 | 2014-03-14 | Boring of sand cores from castings |
Country Status (2)
| Country | Link |
|---|---|
| SI (1) | SI24307A (en) |
| WO (1) | WO2014158098A1 (en) |
Citations (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB113569A (en) * | ||||
| DE7408555U (en) * | 1974-10-24 | Schmid & Wezel | Device for removing core sand or the like | |
| US3989227A (en) | 1974-10-10 | 1976-11-02 | General Kinematics Corporation | Fluid bed blender and cooler |
| JPS54155934A (en) * | 1978-05-31 | 1979-12-08 | Toushin Sangiyou Kk | Removing core sand from casting material |
| DE2947795B1 (en) | 1979-11-28 | 1981-05-27 | Bayerische Motoren Werke AG, 8000 München | Device for knocking out cores from castings |
| GB2067938A (en) | 1980-01-17 | 1981-08-05 | Stoner & Saunders Andover Ltd | A casting-core knockout machine |
| JPS57171566A (en) * | 1981-04-13 | 1982-10-22 | Sintokogio Ltd | Pretreatment for removal of core for casting |
| DE3219390A1 (en) | 1981-05-27 | 1982-12-16 | Werner Bazenheid Lüber | Apparatus for removing core sand from castings |
| DE3319312A1 (en) | 1982-06-10 | 1983-12-15 | Gebr. Grundmann GmbH, 3130 Herzogenburg, Niederösterreich | Process and device for emptying cavities in workpieces |
| EP0111461A1 (en) | 1982-12-14 | 1984-06-20 | FATALUMINIUM S.p.A. | Decoring apparatus for hollow metal castings |
| US4718473A (en) | 1985-01-25 | 1988-01-12 | General Kinematics Corporation | Vibratory stress relief apparatus |
| US4722386A (en) | 1987-04-23 | 1988-02-02 | General Kinematics Corporation | Casting core shakeout |
| JPS63235063A (en) | 1987-03-24 | 1988-09-30 | Hitachi Metals Ltd | Apparatus for removing core sand of casting |
| EP0304683A2 (en) | 1987-08-27 | 1989-03-01 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Method of and installation for decoring castings |
| EP0325928A2 (en) | 1988-01-27 | 1989-08-02 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Installation for decoring castings |
| EP0326138A2 (en) | 1988-01-27 | 1989-08-02 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Device for decoring castings |
| FR2655895A1 (en) | 1989-12-19 | 1991-06-21 | Peugeot | Machine for decoring foundry components |
| WO1992013663A1 (en) | 1991-02-07 | 1992-08-20 | Massin S.A. | Method and devices for decoring castings |
| US5213150A (en) | 1990-11-07 | 1993-05-25 | Doehler-Jarvis Limited Partnership | Core knock-out fixture |
| FR2699840A1 (en) | 1992-12-28 | 1994-07-01 | Peugeot | Fettling machine for removing sand from foundry components |
| FR2711931A1 (en) | 1993-11-05 | 1995-05-12 | Dimafond | Improved device for cleaning the cores of casting of foundry parts. |
| FR2730436A1 (en) | 1995-02-13 | 1996-08-14 | Peugeot | Removing sand from foundry components |
| WO1997021523A1 (en) | 1995-12-13 | 1997-06-19 | Les Outils Pneumatiques Globe Societe Anonyme | Pneumatic assembly having combined approach and strike functions, sand removal unit comprising said assembly, sand removal apparatus comprising said unit, and method for controlling said apparatus |
| WO1997030805A1 (en) | 1996-02-23 | 1997-08-28 | Consolidated Engineering Company, Inc. | System and process for reclaiming sand |
| WO2004067209A1 (en) | 2003-01-23 | 2004-08-12 | Marcel Massin | Automated decoring system and decoring device |
| FR2850890A1 (en) | 2003-02-10 | 2004-08-13 | Remi Dupuis | Blast cleaning device for hollow casting unit e.g. engine block, of automobile, has elastic suspension system to supply mechanical power necessary to vibrate one vibrating shell, when shell is excited to resonance frequency |
| JP2005329410A (en) * | 2004-05-18 | 2005-12-02 | Honda Motor Co Ltd | Sand removal method for hollow camshaft |
| WO2007132101A1 (en) | 2006-05-17 | 2007-11-22 | Massin Technologies | Hammering method, hammering device operable by a vibrator system and use of the device in a de-coring machine |
| FR2901161A1 (en) | 2006-05-17 | 2007-11-23 | Disa Serf | Device for stripping metal castings, comprises a device for fixing the metal castings forming an inner reception space, where the metal castings are maintained, hammered and subjected to vibrations |
-
2013
- 2013-03-29 SI SI201300077A patent/SI24307A/en not_active IP Right Cessation
-
2014
- 2014-03-14 WO PCT/SI2014/000015 patent/WO2014158098A1/en active Application Filing
Patent Citations (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB113569A (en) * | ||||
| DE7408555U (en) * | 1974-10-24 | Schmid & Wezel | Device for removing core sand or the like | |
| US3989227A (en) | 1974-10-10 | 1976-11-02 | General Kinematics Corporation | Fluid bed blender and cooler |
| JPS54155934A (en) * | 1978-05-31 | 1979-12-08 | Toushin Sangiyou Kk | Removing core sand from casting material |
| DE2947795B1 (en) | 1979-11-28 | 1981-05-27 | Bayerische Motoren Werke AG, 8000 München | Device for knocking out cores from castings |
| GB2067938A (en) | 1980-01-17 | 1981-08-05 | Stoner & Saunders Andover Ltd | A casting-core knockout machine |
| JPS57171566A (en) * | 1981-04-13 | 1982-10-22 | Sintokogio Ltd | Pretreatment for removal of core for casting |
| DE3219390A1 (en) | 1981-05-27 | 1982-12-16 | Werner Bazenheid Lüber | Apparatus for removing core sand from castings |
| DE3319312A1 (en) | 1982-06-10 | 1983-12-15 | Gebr. Grundmann GmbH, 3130 Herzogenburg, Niederösterreich | Process and device for emptying cavities in workpieces |
| EP0111461A1 (en) | 1982-12-14 | 1984-06-20 | FATALUMINIUM S.p.A. | Decoring apparatus for hollow metal castings |
| US4718473A (en) | 1985-01-25 | 1988-01-12 | General Kinematics Corporation | Vibratory stress relief apparatus |
| JPS63235063A (en) | 1987-03-24 | 1988-09-30 | Hitachi Metals Ltd | Apparatus for removing core sand of casting |
| US4722386A (en) | 1987-04-23 | 1988-02-02 | General Kinematics Corporation | Casting core shakeout |
| EP0304683A2 (en) | 1987-08-27 | 1989-03-01 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Method of and installation for decoring castings |
| EP0325928A2 (en) | 1988-01-27 | 1989-08-02 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Installation for decoring castings |
| EP0326138A2 (en) | 1988-01-27 | 1989-08-02 | "F.u.K." Frölich & Klüpfel Drucklufttechnik GmbH & Co. KG | Device for decoring castings |
| FR2655895A1 (en) | 1989-12-19 | 1991-06-21 | Peugeot | Machine for decoring foundry components |
| US5213150A (en) | 1990-11-07 | 1993-05-25 | Doehler-Jarvis Limited Partnership | Core knock-out fixture |
| WO1992013663A1 (en) | 1991-02-07 | 1992-08-20 | Massin S.A. | Method and devices for decoring castings |
| FR2699840A1 (en) | 1992-12-28 | 1994-07-01 | Peugeot | Fettling machine for removing sand from foundry components |
| FR2711931A1 (en) | 1993-11-05 | 1995-05-12 | Dimafond | Improved device for cleaning the cores of casting of foundry parts. |
| FR2730436A1 (en) | 1995-02-13 | 1996-08-14 | Peugeot | Removing sand from foundry components |
| WO1997021523A1 (en) | 1995-12-13 | 1997-06-19 | Les Outils Pneumatiques Globe Societe Anonyme | Pneumatic assembly having combined approach and strike functions, sand removal unit comprising said assembly, sand removal apparatus comprising said unit, and method for controlling said apparatus |
| WO1997030805A1 (en) | 1996-02-23 | 1997-08-28 | Consolidated Engineering Company, Inc. | System and process for reclaiming sand |
| WO2004067209A1 (en) | 2003-01-23 | 2004-08-12 | Marcel Massin | Automated decoring system and decoring device |
| US20060272792A1 (en) | 2003-01-23 | 2006-12-07 | Marcel Massin | Automated decoring system and decoring device |
| FR2850890A1 (en) | 2003-02-10 | 2004-08-13 | Remi Dupuis | Blast cleaning device for hollow casting unit e.g. engine block, of automobile, has elastic suspension system to supply mechanical power necessary to vibrate one vibrating shell, when shell is excited to resonance frequency |
| JP2005329410A (en) * | 2004-05-18 | 2005-12-02 | Honda Motor Co Ltd | Sand removal method for hollow camshaft |
| WO2007132101A1 (en) | 2006-05-17 | 2007-11-22 | Massin Technologies | Hammering method, hammering device operable by a vibrator system and use of the device in a de-coring machine |
| FR2901161A1 (en) | 2006-05-17 | 2007-11-23 | Disa Serf | Device for stripping metal castings, comprises a device for fixing the metal castings forming an inner reception space, where the metal castings are maintained, hammered and subjected to vibrations |
Also Published As
| Publication number | Publication date |
|---|---|
| SI24307A (en) | 2014-09-30 |
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