CS208567B1 - Split shell mold or core - Google Patents

Abstract

A split shell mold or core, consisting of at least two parts, solves the connection of these parts with shell rivets made of a mixture for the production of shells.

Description

(54) Split shell form or core

The split shell mold or core, consisting of at least two parts, solves the connection of these parts by the shell rivets of the shells.

208 567

208 567 (54) Split shell form or core

The invention relates to a split shell mold or core consisting of at least two parts and their connection.

The hitherto known split shell molds or core, consisting of at least two parts made of the shell composition or the hot core method, have been bonded together. Resin-based adhesives were used in this connection.

As a rule, the shell molds immediately removed from the heated modeling device are joined, where the curing factor of these, between the mold parts and the core of the adhesives deposited, is the heat accumulated in the just formed shell.

A disadvantage of these shell molds and cores is the consumption of glue and the need for maintenance-intensive devices for applying said resin adhesives. Dimensional inaccuracies and a number of other disadvantages are also associated with the gluing, which will in turn be shown to be eliminated in the advantages of the invention.

The drawbacks of the known solutions are largely eliminated by the solution according to the invention, characterized in that the shell portions of the split shell mold or the shell portions of the split shell core are connected by rivets from the shell composition having a cross-sectional longitudinal section in at least one shell portion the split shell mold or shell portion of the split shell core tapers to a partition plane, wherein at least one shell portion of the split shell mold or shell portion of the split shell core is provided with a recess.

The solution according to the invention is advantageous in that it saves the adhesive for gluing the shell parts of the shell molds and cores, it is possible to use a uniform shell mixture, the same for both the mold or the core and for their connection according to the invention. of the shell composition, since its corresponding amount is saved by preforming the holes intended to connect the shell molds and the cores. There is no need for complex and maintenance-intensive resin adhesive application equipment. Scraps caused by penetration of the adhesive into the mold cavity of the shell mold are also eliminated, especially during manual application of the adhesive with a gun. The dimensional accuracy is also maintained, since there is no adhesive interlayer in the dividing plane. The use of the solution according to the invention is also advantageous in cases where it is necessary to perform the connection of the shell molds or the cores by cold, for example because it is necessary to insert a cooler into the mold.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a portion of a split shell mold according to the invention joined by rivets from a shell composition; FIGS. 4 shows a longitudinal section through a split shell core joined by rivets from the shell composition.

FIG. 1 shows a split shell mold 1 whose shell portions 2 and 3 are joined by rivets 4 from the shell manufacturing composition. The method of joining the shell portions 2 and 3 of the split shell mold 1 is carried out in that in the shell portions or at least one of these shell portions 2 and 3, recesses 5, preferably tapering to the dividing plane x, are preformed into which aligning the clamped shell portions 2 and 3 and clamping them together sprinkles the uncured compound for shell manufacture. Depending on the type of mold or core, this may be either a resin-coated shell composition or a composition used in the hot core method. Either the heat energy accumulated in the freshly made part of the split shell mold or core, or the heat-cured heating element heated by the externally supplied heat energy, is heated to such an extent that it cures.

With respect to the shape of the apertures, it is possible to have recesses 5 in the two shell portions which are tapered to the dividing plane x as shown in FIG. of the shell portions 2 or 3, wherein the protrusion 6 is preformed in the second shell portions 2 or 3, so that a rivet 7 is formed which has a longitudinal section W-shaped with an enlarged central portion as shown in Fig. 2.

FIG. 3 shows one possible embodiment of a split shell mold according to the invention joined by rivets 8 from a shell composition.

FIG. 4 shows one variant of the connection of the split shell cores 9 according to the invention, the core shell parts 10 and 11 of which are joined by rivets 4 from the shell production mixture.

It will be appreciated that the cross-sectional design of the rivets 4, 7 and 8 may be in various shapes while maintaining the spirit of the invention.

Claims (1)

OBJECT OF THE INVENTION A split shell mold or core consisting of at least two parts, characterized in that the shell parts (2, 3) of the split shell mold (1) or the shell part (10, 11) of the split shell core (9) are connected by rivets (4, 7). , 8] of a composition for the production of shells, the cross-section of which in the longitudinal section cuts in at least one shell part (2, 3) of the split shell mold (1) or shell part (10, 11) of the split shell core (9) x) and at least one shell part (2, 3) of the split shell mold (1j or the shell part (10, 11) of the split shell core (9) is provided with a recess (5).