Water jet moulding device - includes lateral adjustable die segments and displaceable tapered jet spray guide

The tapered jet spray guide member has a flange portion for sealing the end of the mould and an expanded diameter portion connected to the flange portion positions the workpiece in the forming cavity of the mould. An extended, diametrically contracted portion connected to the expanded diameter portion is spaced from the workpiece to form a liquid jet passage therebetween. An end portion connected to the extended, diametrically contracted portion has an end point and taper for parting the liquid jet introduced into the forming cavity through a jet port. A jet port in the base on which the mould is mounted communicates with the forming cavity. A liquid passage communicates with the jet port and means are provided for applying an impact pressure on liquid which may be introduced into the liquid passage.