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03/07/2017

A vacuum forming machine as defined in claim

A vacuum forming machine as defined in claim 1, wherein said operative position is at a lower level than said inoperative position and said transfer position is at a lower level than said operative position. The positive mold is vertically displaceable with respect to the bridge between the operative position and a transfer position in which the article formed on the positive mold is transferred therefrom. 7,328,626 that a relatively large number Paste Packing Machine of negative deep-drawing molds has to be circulated. Otherwise, in case of grained sheets, the upper surface structure is distorted excessively and the resetting stresses in relatively deep articles having abrupt configurationslead to a warping of the article.

 

 

In a vacuum forming machine including a machine frame; a forming station having tensioning means for clamping a thermoplastic sheet blank to be deformed into an article, abridge and a positive mold carried by said bridge; the improvement comprising in combination:(a) first guide means for vertically displaceably supporting said bridge in said machine frame;(b) first drive means for vertically displacing said bridge and said positive mold as a unit between an inoperative position in which said positive mold is spaced from a location where the blank is clamped by said tensioning means and anoperative position in which said positive mold is in an operative, contacting relationship with the blank clamped by said tensioning means;(c) second guide means for vertically displaceably supporting said positive mold on and relative to said bridge; and(d) second drive Powder Packing Machine means for vertically displacing said positive mold with respect to said bridge between said operative position and a transfer position in which the article formed on said positive mold is transferred therefrom. Such a machine, however, has particular advantages in the deformation of grainedsheets including grained foam sheets as well as the manufacture of relatively deep (large-height) components.

The bridge is vertically displaceable together with the positive mold between an inoperative position in which the positive mold is spaced from a location where the blank is clamped by the tensioning device and an operative position in which the positive mold is in an operative, contacting relationship with the blank. It is difficult to maintain all these molds at apredetermined temperature which is required for the deformation. 7,328,626 there is disclosed a vacuum forming machine which cooperates with a foaming apparatus.A vacuum forming machine as defined in claim 1, further comprising rolling elements carried by said machine frame and supporting the machine on the ground, whereby said machine is displaceable.It is further known to deform the sheet blanks directly by the foam pressure; that is, the sheet blank is positioned in a cold state into the foaming mold.

 

It is a further disadvantage of the vacuum forming machine disclosed in German Utility Model No.A vacuum forming machine as defined in claim 1, wherein said tensioning means comprises a stationary clamping frame and a movable clamping frame being in substantial alignment and cooperating with said stationary clamping frame; eachclamping frame having an inner diameter; the inner diameter of said movable clamping frame being greater than the inner diameter of said stationary clamping frame. The pressure generated during foaming causes the sheet blank to conform to the mold wall.