Sintokogio, Ltd.

Toshihiko Oya

Minoru Hirata

Takayuki Komiyama

Koichi Sakaguchi

Tsuyoshi Sakai

Hisashi Harada

Takashi Hanai

Takuya Nitta

Kozo Sugita

Kazunori Ogura

To provide a method and a machine for forming flaskless molds with a shortened cycle time even if many cores are placed, to thereby achieve efficient molding. The flaskless molding machine comprises at least four pairs of upper and lower flasks, each pair comprising an upper flaskand a lower flask, a devicefor pivoting the flasks to move the at least four pairs of upper and lower flasks via at least four stations, including a molding station, a first station for placing a core, a second station for placing a core, and a station for extracting the molds, a match plate, a pair of squeeze plates, a storage tankfor sand, a devicefor moving forward and backward around an axis that moves around the axis the upper and lower flasks where an upper mold cavity and a lower mold cavity are formed so that ports for introducing molding sand can receive the molding sand from a pair of nozzles for introducing molding sand, a squeezing device, a devicefor moving the upper and lower flasks, and a devicefor extracting the molds.

Flaskless molding method and a flaskless molding machine

A molding machine that defines upper and lower mold cavities while cope and drag flasks, having a match plate sandwiched therebetween, are rotated from a horizontal position to a vertical position. An upper squeeze member is insertable into the cope flask. A pressure-applying plane of the upper squeeze member defines an upper mold cavity together with the match plate and the cope flask. A pivoting frame supports the cope and drag flasks, having a match plate sandwiched therebetween, and the upper squeeze member, such that they rotate in unison between a horizontal position to a vertical position. A fixed filling frame abuts the drag flask when the cope and drag flasks are in the vertical position. A lower squeeze member has a pressure-applying plane that is oriented horizontally. The pressure-applying plane of the lower squeeze member defines a lower mold cavity together with the match plate, the drag flask, and the filling frame.

Molding machine

A sand-introducing device that uses air for introducing molding sand in a molding space or spaces is provided. The device is provided with air-permeable partitioning plates that define a double-walled structure together with the wall of the body of the device. The air-permeable partitioning plates are easily produced, they can easily inject pressurized air of a desired pressure, and they will not need regular maintenance. The body of the device, which acts as a pressure tank, defines a double-walled structure together with the air-permeable partitioning plates (), thereby defining chambers (). In the sand-introducing device that uses air, while molding sand is fluidized by pressurized air injected from the air-permeable partitioning plates, it is introduced in a molding space. Each air-permeable partitioning plate is made of a porous resin or metal.

Sand-introducing device using air, and method and apparatus for producing mold

Sand-introducing device using air, and method and apparatus for producing a mold

The disclosed invention provides a molding machine that defines upper and lower molding spaces while cope and drag flasksand a match plateclamped therebetween are rotated from a horizontal position to a vertical position, and that readily places a core into a lower mold within the drag flask. An upper squeeze memberis insertable into the cope flaskwith its pressure-applying plane being opposed to the upper face of the match plate. The pressure-applying plane defines an upper molding space together with the upper face of the match plateand the cope flask. A pivoting framesupports the cope and drag flasks, a match plateclamped therebetween, and the upper squeeze member, such that they rotate in unison between a horizontal position, in which the pressure-applying plane of the upper squeeze memberis oriented vertically downward, to a vertical position in which the pressure-applying plane is oriented horizontally. A fixed, vertical, filling frame abuts the drag flaskwhen the flasksand the match platethat is clamped therebetween are in the vertical position. A lower squeeze memberhas a pressure-applying plane that is oriented horizontally, and is insertable into the filling frame and the abutting drag flask. The pressure-applying plane of the lower squeeze memberdefines a lower molding space together with the lower face of the match plate, the drag flask, and the filling frame. To place a core into a lower mold within the drag flask, the drag flaskis laterally moved from a position that is immediately beneath the cope flasksuch that an open working space is provided.

Flaskless molding machine

A method of controlling the operation of an apparatus for making an upper and a lower mold and the apparatus therefore that prevents a mold from having a wrap or a match plate from being damaged. The apparatus controls the forward movement of an upper and a lower squeeze member such that when each moves forward to the match plate by a squeeze device, the difference in the squeeze forces imparted to the upper squeeze member and the squeeze force imparted to the lower squeeze member, is kept within the predetermined tolerance.

Method of operation for an apparatus for making an upper and a lower mold and the apparatus therefor

A hydraulic power unitof a match-plate molding machine comprises a hydraulic pumpfor supplying oil, a piping system, andthat fluidly communicates with first and second hydraulic cylinder systemsandfor supplying the oil from the hydraulic pumpto them to perform a squeeze step, an accumulatorthat is provided within the piping system, first and second electromagnetic directional control valvesandfor controlling the flow of the oil from the hydraulic pumpto the first and second hydraulic cylinder systemsand, first and second pressure sensorsandfor measuring pressures of the oil of the first and second hydraulic cylinder systemsand, and for generating output signals that correspond to the measured value, and a controllerfor receiving the output signals from the first and second pressure sensorsand, and for controlling the turns of the first and second electromagnetic directional control valvesandbased on the output signals and the predetermined value within a range below the pressure holding the accumulatoragainst the oil.

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Toyokawa, Japan

Toshihiko Oya