Afin d'empêcher la flexion du cylindre et la rupture de l'élément cylindrique interne, due à une différence du coefficient de dilatation entre les éléments cylindriques interne et externe, une plurailté de trous (24) sont formés dans une surface limite entre les éléments cylindriques interne et externe (22), (21), ce qui permet d'améliorer les caractéristiques d'isolation du cylindre.
This invention relates to a cylinder for die casting, which has a dual construction consisting of an inner ceramic cylinder member and an outer metal cylinder member, and which is characterized in that, in order to prevent the bending of the cylinder and the breakage of the inner cylinder member which are ascribed to a difference in the coefficient of thermal expansion between the inner and outer cylinder members, a plurality of bores (24) are formed in a boundary surface between the inner and outer cylinder members (22), (21), whereby the heat insulating characteristics of the cylinder are improved.patents-wipo patents-wipo