Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1993-07-29
1995-02-07
Bushey, Charles S.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
249102, 425192R, 425577, B29C 3300
Patent
active
053870964
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a removable insert for casting molds.
It also relates to a casting mold for producing molded parts with inserts.
DESCRIPTION OF THE PRIOR ART
Particularly for the injection molding process, molds already exist, the cavity of which is made variable by the use of inserts, in such a manner that workpieces of one and the same basic shape, but in which in certain regions of the workpiece various shapings result, depending on the intended use, can always be produced with such a casting mold. With one and the same basic mold, housings for various television sets can thus be produced by injection molding, having substantially the same basic shape but differing in their details; for instance, depending on the model of television set, they have to be provided with recesses at different locations.
To produce such recesses, inserts corresponding to the shape of the desired recess must be provided in the mold cavity of a corresponding injection mold. To install such inserts, the molds were previously drilled from the outside, and the insert then bolted down firmly with a screw introduced through the bore from the outside. With this kind of procedure, although the shape of the insert that defines the shape of the workpiece is unimpaired, nevertheless the bores made from the outside of the mold entail undesirable engineering expense and setup times and may possibly interfere with the installation of tempering conduits and the like.
The object of the present invention is to create a removable insert for casting molds of the type involved here, which can be installed in a simple manner from the inside of the casting mold, yet in which the fastening elements of the insert do not impair the shape of the insert or interfere with the structure or operation of the mold.
The construction so defined is distinguished by the fact that its fastening elements do not impair the shape of the insert or the structure and operation of the mold, and therefore such inserts can be advantageously used to achieve various shapes in certain regions of otherwise identical workpieces, or can also be used as construction elements of the molds themselves, examples being guide elements, locks, diagonal-tension elements, thrust pieces, and the like.
Inserts according to the present invention are also especially advantageous in conjunction with C C technology, that is, computer-aided mold design, in which match plates can be economically machined only from five sides, while machining from the back cannot be performed economically. The inserts according to the present invention, which can be installed from the front, are especially advantageous precisely for this use.
However, the invention also resides in a casting mold with inserts of the type defined by the foregoing claims. Inserts installed in opposed mold halves can supplement one another in a sealing manner, or mold wall parts can cooperate sealingly with such inserts.
BRIEF FIGURE DESCRIPTION
FIG. 1 shows an insert (with a fixation pin for a retaining body of the fastening screw) built into a mold part;
FIG. 2 shows an insert corresponding to FIG. 1 but removed from the mold part (and having a thread for fixation of the retaining body);
FIG. 3 shows a mold comprising two elements (match plates) with a plurality of built-in inserts;
FIG. 4 is a perspective view of a workpiece to be cast with the mold of FIG. 3.
DETAILED DESCRIPTION
FIG. 1, overall, shows an insert for casting molds by means of which molded parts can be made.
A molded part of this kind is shown overall in FIG. 4. Such a molded part may be produced from castable and injectable materials, and in particular from metals and plastics. Molded parts of this kind are used in many versions as construction parts, housings, etc., in the most various fields in technology. The necessity exists of embodying such molded parts not only as unitary slabs, angled parts, hollow bodies and the like, but attachments and recesses, as shown in FIG. 4 at 1, 3 and 5, must also be provided in such mo
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