子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 81 | Method and apparatus for compacting foundry molding material in a foundry mold | US426588 | 1989-10-24 | US5020582A | 1991-06-04 | Norbert Damm; Thomas Parr |
| To improve the accuracy of making a casting pattern from a casting model or mold (2, 2') in a molding material (M) retained in a foundry form, a single pressure pulse (P) is applied to the molding material which, however, has two phases of pressure gradient, namely a first or initial phase (1) of low pressure gradient extending up to about 1 to 3 bar during between about 10-100 m/sec, for example about 50 m/sec, to initiate fluidization of the molding material. The then fluidized and still fluidized molding material is compacted by raising the pressure from the initial low pressure pulse abruptly at a second and much higher pressure gradient to the customary compaction pressure of between 3 to 6 bar. The two-phase pressure pulse can be applied, selectively, only in a region above the model or throughout the entire mold. The pressure pulse can be generated by applying the pulse but controlling a gas admission valve (11) for an initial slow valve-opening movement, for example by throttling hydraulic counterpressure (35, 36), and then permitting rapid opening movement of the valve (11) by inhibiting the throttling; or (FIG. 4) by applying the full pressure pulse from the valve and interposing a throttle (41) in the path of the air flow from a compressed air chamber (5) to the mold box (3, 4), for example by a relatively shiftable apertured plate operable above a similarly apertured counter plate for selective alignment and misalignment of the respective apertures. | ||||||
| 82 | Air impact sand-box moulding machine | US503611 | 1990-04-03 | US5007477A | 1991-04-16 | Agustin A. Erana |
| A motor is mounted on a support positioned under a sand-supplying hopper. The motor is provided with sand-stirring vanes and has a protective plate to protect the motor from sand discharges. An air discharge valve is provided annularly outside the hopper and includes an annular plunger which has a dihedral-shaped front face for closing a correspondingly-shaped annular aperture connected to an air source and is displaceably positioned within an annular chamber provided in a support ring of the valve. | ||||||
| 83 | Air impact molding machines for making sand molds | US422914 | 1989-10-18 | US4969503A | 1990-11-13 | Vicente L. De Foronda |
| The machine includes a compressed air bell-shaped ejector, a sand supplying hopper positioned above a diffuser located over a molding box receiving sand from the hopper. The sand supplying hopper is arranged axially inside the compressed air bell-shaped ejector so that an annular mouth is defined, which surrounds a sand discharge mouth of the hopper. The mouth of the hopper and the mouth of the ejector both face the diffuser which closes the top of the molding chamber. A valve for closing the bell-shaped ejector includes a tubular membrane which is adapted and fixed at its edges to the internal surface of the diffuser, at a coaxial portion thereof which faces the hopper. | ||||||
| 84 | Apparatus for the compacting of granular molding materials | US292775 | 1989-01-03 | US4860817A | 1989-08-29 | Alfred Joern; Wendelin Weimann |
| An apparatus for compacting granular materials comprises a rack having a pedestal for supporting the mold which contains the granular material to be compacted. A compacting mechanism for applying a compacting force to the granular material is mounted for vertical movement above the mold and is provided with a seal for sealing the mold when applying a compacting force to the granular molding material. | ||||||
| 85 | Method of, and apparatus for, manufacturing foundry molds, especially for compacting foundry molding material | US842232 | 1986-03-21 | US4750540A | 1988-06-14 | Dietmar Boenisch |
| Foundry molding material is poured or pneumatically infed into a mold frame arrangement containing at least one pattern, a molding frame and a filling frame. Subsequently, the foundry molding material is compacted by a compacting arrangement containing, for example, any one of a compressed-air surge compacting device, a combustion-force surge compacting device, a pressure compacting device, a vibrational compacting device or a combined pressure-and-vibrational compacting device. Also during such compacting operation at least the predominant portion of the foundry molding material contained in the filling frame is displaced into the molding frame. During such compacting operation a preselected expanding gas is infed into predetermined local regions of the foundry molding material while such material is being compacted. As a result, there are formed zones of reduced packing density in the foundry molding material. During the further compacting operation, but in any case at the end of such compacting operation, the zones of reduced packing density are eliminated and the packing density of such zones is at least approximately equalized with the packing density prevailing in the remaining zones of the foundry molding material. | ||||||
| 86 | Method and apparatus for the production of flaskless foundry molds | US823569 | 1986-01-29 | US4724888A | 1988-02-16 | Eugen Buhler |
| A method and apparatus for producing flaskless foundry molds made up of copes and drags of wet casting foundry sand, which is blasted into a cavity to form the mold with the use of vacuum. The sand is pressed mechanically while aspirating air therefrom. The gap coming into existence between the pressing plate and the back side of a mold during pneumatic impact compaction is filled with sand before pressing so that a flat back side is produced on the mold so that when casting takes place later there is not danger of the bottom of the mold fracturing or of deformation taking place. | ||||||
| 87 | Apparatus for compressing foundry moulding material by pressure gas | US767274 | 1985-08-02 | US4619307A | 1986-10-28 | Gunter Muller; Norbert Damm |
| In an apparatus for compressing foundry moulding material by pressure gas comprising a pressure vessel for the pressure gas forming an inlet pressure chamber, a moulding chamber positioned below it formed from moulding boxes with sand frames and a pattern plate with pattern on which the moulding material is loosely heaped up prior to compression and a large-area valve arranged between the pressure vessel and the moulding chamber, its closure member frees the valve opening in a few milliseconds, accompanied by the joint action of the pressure in the pressure vessel and thereby moves into the moulding chamber. The closure member is brought into the closed position by a pressure cylinder, whose piston is connected on the stroke side to a high pressure source and with its opposite side forms the movable termination of a gas-pressurized pressure reservoir, the high pressure side outflow being constructed in such a way that the pressure medium flows out at a speed of more than 10 m/s, accompanied by the simultaneous acceleration of the piston under the pressure in the pressure reservoir and the closure member into the open position. | ||||||
| 88 | Apparatus for compacting molding sand using pressurized gas | US614677 | 1984-05-29 | US4588017A | 1986-05-13 | Norbert Damm; Alfons Kobel |
| An apparatus for the compaction of foundry sand using a pressurized gas method is made up of a conventional flask closed by a pattern plate with a pattern and has a filling frame and a chamber over the foundry sand heaped on the pattern. A high-speed filling of the chamber is carried out by gas under pressure in a matter of milliseconds so that the foundry sand is compacted while at the same time the pressure falls. In order to be certain of an even and reproducible compacting effect on the sand whatever way of producing the gas pressure is used, i.e. with or without an explosion of a gas mixture to get a gas pressure wave, use is made of a piston plate that is placed a small distance over the surface of the sand filling for separating the sand from the gas pressure space at least at the beginning of the action of the gas, such piston plate being freely movable and having an outline generally the same as the free cross section of the filling frame and the flask. The piston plate is returned to its initial position after sand compaction. | ||||||
| 89 | Apparatus for the compression of granular material | US675716 | 1984-11-28 | US4571168A | 1986-02-18 | Hans Tanner; Kurt Fischer |
| An apparatus for the introduction of a gaseous medium into a chamber, especially for compressing casting molding material with a high-pressure gaseous medium supplied by a pressure vessel linked with the chamber by means of a valve system. The system has a seat having traversing openings which can be covered or uncovered by a stroke-activatable valve plate. The gaseous medium flows freely round the surface of the valve plate. The valve plate also is provided with traversing openings which, however, are displaceably arranged vis-a-vis the traversing openings of the valve seat. To trigger a pressure shock from the gaseous medium necessary to effect compression, an elevating mechanism for the valve is activated to lift the valve plate. The pressurized gaseous medium then flows round, as also throughout the valve plate and acts on the surface of the chamber. | ||||||
| 90 | Apparatus for compacting granular molding materials by pressurized gaseous mediums | US541573 | 1983-10-13 | US4565235A | 1986-01-21 | Kurt Fischer; Hans Tanner |
| The apparatus has a plurality of tubular hollow members arranged between the pressure chamber and the molding units, in the pressure surge flow direction, for conducting the gaseous medium to the top of the molding material. With distribution of the pressure medium flow through a plurality of independent and different cross sections, the lifting force required to open the packing element is greatly reduced and the packing element can be opened rapidly. | ||||||
| 91 | Process and apparatus for compacting mold material | US475725 | 1983-03-16 | US4538664A | 1985-09-03 | Alfons Kobel; Norbert Damm |
| In a process for compacting foundry mold making material, and more specially wet foundry sand, by the violent effect of gas pressure on the free surface of the mold material heaped on to the pattern, the compacting effect may be made better and the height of extra material on the pattern may be better controlled by placing a gas-permeable further or auxiliary mass on the free surface of the mold material. The further material is made up of separate pieces of material that may be moved in relation to the surface of the mold material, the gas pressure taking effect on the free surface of the further mass. The further mass may be used in compaction processes in which the pressure wave is produced by expansion of gas from a receiver and processes in which the wave is produced by an explosion. | ||||||
| 92 | Process for compacting granular materials | US310968 | 1981-10-13 | US4483383A | 1984-11-20 | Hans Tanner |
| A method of compacting particulate material includes providing a primary fuel mixture of air and natural gas in a closed chamber enclosing a surface of the material to be compacted. An additive gas, such as hydrogen, having a higher combustion velocity is added to the primary fuel/air mix and ignited, creating an exothermic reaction which compacts the material. The additive gas increases the gradient of the pressure rise curve of the combustion. Various fuels and additive gases and disclosed. | ||||||
| 93 | Process of compacting moulding sand | US207959 | 1980-10-02 | US4415015A | 1983-11-15 | Lumir Zadera |
| A process for compacting moulding sand to form a casting mould comprises the steps of filling a moulding space located between a pattern plate and a pressure plate with moulding sand, pre-compacting the moulding sand, after the moulding space is filled with moulding sand and closed by the pressure plate, by an explosive-type shock pressure, and subsequently re-compacting the moulding sand by mechanically pressing the moulding sand between the pattern plate and the pressure plate. | ||||||
| 94 | Apparatus for compacting a moulding mixture | US3659642D | 1969-12-22 | US3659642A | 1972-05-02 | VASILKOVSKY LEV FEDOROVICH; SJUSJUK VLADIMIR EFIMOVICH; ABROSIMOV NIKOLOI NIKITOVICH; GEIDEBREKHOV GEORGY ANDREEVICH; LYASHENKO VSEVOLOD ANDREEVICH; PODMOGILNY VLADIMIR IVANOVICH |
| A device for compacting a moulding mixture in which the latter is subjected to the action of compressed air by supplying the air into a reservoir under a pressure exceeding 20 kg/cm2 in such an amount that 3 to 40 volumes of air under a normal pressure are provided per unit or volume of the mixture being densified. Then the reservoir is discharged during a time interval not exceeding 0.15 sec. by directing the flow of air into the mixture in a moulding box. The reservoir is formed by a chamber of a housing and at the external side of this housing under a discharge opening closed by a valve there is mounted a plate forming an additional chamber. The plate has holes for a uniform distribution of the air over the surface of the mixture being compacted.
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| 95 | Explosive force molding machine and method | US22693062 | 1962-09-28 | US3233291A | 1966-02-08 | MILLER LEON F; ELLMS ROBERT W |
| 96 | Foundry process | US21863962 | 1962-08-22 | US3170202A | 1965-02-23 | HUSTON SR WILLIAM J; DE MOTT ARTHUR E |
| 97 | Method of and apparatus for venting molds. | US2303815 | 1915-04-22 | US1157847A | 1915-10-26 | DAVIS JAMES C |
| 98 | Process of manufacturing grate-bars. | US1911626028 | 1911-05-09 | US1022773A | 1912-04-09 | DAVID LEON |
| 99 | Method of packing flasks. | US1906323947 | 1906-06-28 | US840070A | 1907-01-01 | LENGFELDER HENRY W |
| 100 | wrigley | US511393D | US511393A | 1893-12-26 | ||
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