GB2256386A - Sand mould pressing head - Google Patents
Sand mould pressing head Download PDFInfo
- Publication number
- GB2256386A GB2256386A GB9211464A GB9211464A GB2256386A GB 2256386 A GB2256386 A GB 2256386A GB 9211464 A GB9211464 A GB 9211464A GB 9211464 A GB9211464 A GB 9211464A GB 2256386 A GB2256386 A GB 2256386A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressing head
- elastic plate
- sand
- pattern
- plate
- 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
- 239000004576 sand Substances 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 description 2
- 206010061224 Limb discomfort Diseases 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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)
- Casting Devices For Molds (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Soil Working Implements (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
'2-3 03?)o PRESSING DEVICE FOR SAND MOULDS The invention relates to a
pressing head anda device for sand moulds, and to a method for compressing sand around a pattern in a substantially uniform manner.
Rigid pressing plates in simple mould machines are known but for the most part they achieve unsatisfactory results because overcompression occurs in the region of high pattern parts whilst in the other zones there is insufficient pressing force.' So-called multi-stamp presses are also known which comprise a plurality of adjacently disposed hydraulic cylinders whose downwardly travelling piston rods have pressure feet which between them cover the entire mould surface. The rods descend to different depths according to the local height of the pattern.
This apparatus is very expensive and extremely liable to wear; also since it uses a plurality of rigid pressing plates which, for structural reasons, cannot exceed a certain size, uniform sealing can not be guaranteed, especially in the edge regions. It is the aim of the present invention to remove the above-mentioned disadvantages. 25 This aim is achieved by providing, in the pressing head, a highly elastic plate of a substantially incompressible material with a hardness of <40 Shore A. The modulus of elasticity of the material should be less than about 500 kPa(kplcm2). A preferred embodiment is described in detail with reference to Fig. 1, which shows a pressing device in accordance with the invention. Above a pattern device 1, set on a base with a casting box 2 and sand frame 3 disposed thereon, there is arranged a generally rigid pressing head or support plate,5 which can be moved vertically by a hydraulic cylinder 4. Secured to the pressing head 5 is a thick plate of highly elastic incompressible material 6 whose Young's modulus is less than about 500 kPa. 5 If the pressing head 5 is now pressed by the cylinder 4 on to the moulding sand 7 then the elastic plate 6 adapts to the differing compressibility of the sand, caused by the varying contour of the pattern 1, to such an extent that on each cm2 of the sand surface, except for the edge strip 9, an approximately uniform specific applied pressure is produced.
Since the plate 6 consists of substantially incompressible material (e.g. rubber, silicone etc.) it is "dented" in the region of high pattern parts and "bulges" in shallow pattern regions.
As shown in the Figure, air pockets 10 are contained in the material 6, but these are optional. In particular for compressing extremely high patterns it is desirable to include such pockets at least in the region of the high points, ensuring an enhanced local compressibility.
In a further common embodiment it is not the pressing head 5 which is pressed by a cylinder 4 on to the sand 7, but casting box 2, pattern device 1, sand frame 3 and sand 7 are pressed by pressing cylinders, located underneath, against a pressing plate fixedly arranged above.
Claims (8)
1. Pressing head for a pressing device for sand moulds, including an elastic plate of a substantially incompressible material with.a hardness of <40 Shore A, for producing a substantially uniform applied pressure.
2. Pressing head according to claim 1, in which air chambers are provided in the elastic plate.
3. Pressing head according to claim 1, or 2, further including surrounding edge strips for lateral 10 support of the elastic plate.
4. Pressing head according to claim 3, in which the edge strips press nonelastically in the edge region not to be occupied by a pattern.
5. Pressing head according to any preceding claim, in which the elastic plate has a Young's Modulus of less than about 500 kPa. -
6. Pressing head as claimed in any preceding claim and including a support plate to which the elastic plate is secured.
7. A pressing device including a base, a pressing head as claimed in any preceding claim and a means for urging the head and base together so that the elastic plate accommodates itself to the shape of a pattern.
8. A method of compressing a sand mould around a pattern, comprising the steps of: providing a pressing head including an elastic, substantially incompressible plate facing the sand, and applying a force to the plate so as to compress the sand and cause the elastic plate to adapt to any variations in height of the pattern.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1638/91A CH684683A5 (en) | 1991-06-03 | 1991-06-03 | Press main for a pressing device for sand molds. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9211464D0 GB9211464D0 (en) | 1992-07-15 |
| GB2256386A true GB2256386A (en) | 1992-12-09 |
| GB2256386B GB2256386B (en) | 1995-01-11 |
Family
ID=4215144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9211464A Expired - Fee Related GB2256386B (en) | 1991-06-03 | 1992-05-29 | Pressing device for sand moulds |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPH06246392A (en) |
| CN (1) | CN1067396A (en) |
| CH (1) | CH684683A5 (en) |
| DE (1) | DE4213187A1 (en) |
| ES (1) | ES2063639B1 (en) |
| FR (1) | FR2676945A1 (en) |
| GB (1) | GB2256386B (en) |
| IT (1) | IT1255459B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773411A (en) * | 2012-08-20 | 2012-11-14 | 机械科学研究总院先进制造技术研究中心 | Digital die-free sand mould extrusion forming method |
| CN102773420A (en) * | 2012-08-20 | 2012-11-14 | 机械科学研究总院先进制造技术研究中心 | Combined die moulding method of sand mould |
| CN102794392A (en) * | 2012-08-20 | 2012-11-28 | 机械科学研究总院先进制造技术研究中心 | Modeling mold based on fractal structure and modeling method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050547C (en) * | 1994-03-24 | 2000-03-22 | 金属机械股份有限公司 | Method and apparatus for making sand mold |
| CN101204731B (en) * | 2006-12-18 | 2010-10-13 | 天水星火机床有限责任公司 | Meltpit latch type gas box device for investment moulding |
| CN109848376A (en) * | 2019-03-19 | 2019-06-07 | 芜湖诚拓汽车部件股份有限公司 | Auto parts and components casting model powder mould molding equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB971004A (en) * | 1961-01-03 | 1964-09-23 | Russell William Taccone | Method and device for compacting a pressure-compactible particulate material |
| GB1019809A (en) * | 1962-07-02 | 1966-02-09 | Russell William Taccone | Means for compacting a particulate material |
| JPS55117544A (en) * | 1979-02-28 | 1980-09-09 | Toyota Motor Corp | Shaping machine for mold |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE516911C (en) * | 1929-10-29 | 1931-01-28 | Walter Killmer | Elastic pressing device for molding machines |
| DE801574C (en) * | 1949-04-17 | 1951-01-11 | Johannes Wisser | Method and device for evenly compacting the sand in compression molding machines |
| DE883799C (en) * | 1951-07-06 | 1953-07-20 | Werner Dipl-Ing Schlegel | Method and device for compacting the molding sand in molding machines |
| JPS50117544A (en) * | 1974-02-27 | 1975-09-13 | ||
| SU662240A2 (en) * | 1976-12-03 | 1979-05-15 | Всесоюзный Научно-Исследовательский Институт Литейного Машиностроения,Литейной Технологии И Автоматизации Литейного Производства | Press block |
| SU1155348A1 (en) * | 1982-07-28 | 1985-05-15 | Minchenkov Aleksandr V | Apparatus for compacting the moulding sand |
-
1991
- 1991-06-03 CH CH1638/91A patent/CH684683A5/en not_active IP Right Cessation
-
1992
- 1992-04-22 DE DE4213187A patent/DE4213187A1/en not_active Ceased
- 1992-05-08 ES ES09200958A patent/ES2063639B1/en not_active Expired - Lifetime
- 1992-05-19 FR FR9206048A patent/FR2676945A1/en not_active Withdrawn
- 1992-05-20 IT ITMI921212A patent/IT1255459B/en active IP Right Grant
- 1992-05-29 GB GB9211464A patent/GB2256386B/en not_active Expired - Fee Related
- 1992-06-02 JP JP4141567A patent/JPH06246392A/en active Pending
- 1992-06-03 CN CN92104264.7A patent/CN1067396A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB971004A (en) * | 1961-01-03 | 1964-09-23 | Russell William Taccone | Method and device for compacting a pressure-compactible particulate material |
| GB1019809A (en) * | 1962-07-02 | 1966-02-09 | Russell William Taccone | Means for compacting a particulate material |
| JPS55117544A (en) * | 1979-02-28 | 1980-09-09 | Toyota Motor Corp | Shaping machine for mold |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773411A (en) * | 2012-08-20 | 2012-11-14 | 机械科学研究总院先进制造技术研究中心 | Digital die-free sand mould extrusion forming method |
| CN102773420A (en) * | 2012-08-20 | 2012-11-14 | 机械科学研究总院先进制造技术研究中心 | Combined die moulding method of sand mould |
| CN102794392A (en) * | 2012-08-20 | 2012-11-28 | 机械科学研究总院先进制造技术研究中心 | Modeling mold based on fractal structure and modeling method thereof |
| CN102794392B (en) * | 2012-08-20 | 2015-12-02 | 机械科学研究总院先进制造技术研究中心 | A kind of moulding mould based on fractal structure and formative method thereof |
| CN102773411B (en) * | 2012-08-20 | 2016-01-20 | 机械科学研究总院先进制造技术研究中心 | A kind of digitlization non-model sand mold extrusion forming method |
| CN102773420B (en) * | 2012-08-20 | 2016-01-20 | 机械科学研究总院先进制造技术研究中心 | A kind of assembling die formative method of sand mold |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1255459B (en) | 1995-11-02 |
| FR2676945A1 (en) | 1992-12-04 |
| ES2063639R (en) | 1996-08-16 |
| GB9211464D0 (en) | 1992-07-15 |
| DE4213187A1 (en) | 1992-12-10 |
| ITMI921212A1 (en) | 1993-11-20 |
| CH684683A5 (en) | 1994-11-30 |
| ES2063639B1 (en) | 1997-04-16 |
| GB2256386B (en) | 1995-01-11 |
| ITMI921212A0 (en) | 1992-05-20 |
| CN1067396A (en) | 1992-12-30 |
| JPH06246392A (en) | 1994-09-06 |
| ES2063639A2 (en) | 1995-01-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970529 |