High tonnage rim press
AssigneeThe Dow Chemical Company
InventorPaul Zakich
Life of this patent
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Abstract
A high tonnage reaction injection molding press has a fixed and a moveable mold plate for clamping a composite mold therebetween. A plurality of high pressure hydraulic cylinders are mounted on a carrier for the movable mold plate. Fluid actuated means move the carrier and movable plate to a locking position whereat the carrier is locked adjacent to the fixed plate. Short stroke connecting rods operated by the cylinders are then forced independently of each other into high tonnage connected engagement with the movable plate at a plurality of locations within the area of the mold to clamp the mold between the plates. The high tonnage force applied independently at each location assures that the junctures of the composite mold adjacent to said locations are positively sealed.
Claims16
A RIM press comprising a pair of mold plates movable with respect to each other to a clamping position, each plate providing one of a pair of mold parts cooperable to interfit and comprise a mold having a sealed reaction injection mold cavity therebetween when said plates are clamped toward each other at said clamping position, a carrier associated with one of said plates and movable with respect thereto to a locking position adjacent to said one plate at said clamping position, means operative for blocking movement of said carrier from said locking position force exerting means carried by said carrier for forcing said one plate toward said other plate at said clamping position comprising a plurality of connectors extensible independently of each other in the direction from said carrier toward said one plate for pressing thereagainst at a plurality of separate locations within the area of said mold when the latter is clamped between said plates, and means independent of said force exerting means for moving said mold plates with respect to each other to said clamping position.
A high pressure RIM press for forming an article in a mold comprising a pair of mold plates movable with respect to each other to a clamping position, each plate providing one of a pair of mold parts cooperable to interfit and comprise a mold having a sealed reaction injection mold cavity therebetween when said plates are clamped toward each other at said clamping position, a carrier associated with one of said plates and movable with respect thereto to a locking position adjacent to said one plate at said clamping position, means selectively operative for locking said carrier against movement at said locking position, means for clamping said plates toward each other in a high pressure clamping operation at said clamping position and for compensating for deformation of components of said press to assure predetermined formation of said article during said high pressure clamping operation comprising force exerting means carried by said carrier for clamping said one plate toward said other plate when said carrier is locked at said locking position, said force exerting means comprising a plurality of connectors independently extensible in the direction toward said one plate for pressing thereagainst at a plurality of separate locations within the area of said mold, and means independent of said force exerting means for moving said mold plates with respect to each other to said clamping position.
Dependencies are inferred from the claim text.