HU199085B - Method for producing wax pattern first for small details of intricate shape and device for precision casting such details - Google Patents

Abstract

A method is proposed for the preparation of wax patterns for casting small, intricate components and equipment for casting such components. A master pattern (2) is made, of a material which can withstand vulcanisation and will retain its shape. The master pattern is placed in a mass of raw rubber, which is compressed and vulcanised afterwards. The rubber is cut in two, the master pattern is removed and the rubber mould halves (3,4) are joined. The proposed equipment comprises the following:- the base (6) is arranged for rotation by an electric motor, around a point (7) the molten metal feeder (8) is located away from this point, and is connected to the casting mould (9). The molten metal feeder (8) is arranged on the base (6), so that it can be tilted radially. The molten metal feeder (8) itself comprises the following:- melting crucible (10), surrounded by a high frequency coil (11), tilting mechanism (12), and holder mechanism (13) for the moulds.

Description

The present invention relates to a process for the preparation of a wax sample, in particular for complicated parts and smaller parts, wherein the wax is molded, cooled and extracted.

The invention also relates to an apparatus for precision casting, particularly of complex shapes and smaller parts, which comprises a molding holder and a molten metal feeder.

Known process for producing a wax sample from the eBook of Ernő Lupták: Precision Casting (Technical Publisher, Budapest, 1967, pp. 25-30), mainly for complicated shapes and smaller parts, the essence of which is to create the wax sample in a metal form.

The disadvantage of the solution is that forming the form from metal does not provide expensive, time consuming and undercut surfaces. ·

Known apparatus for precision casting of parts is also known in the art. side, which means that the bush-shaped tin pattern is mounted on a rack with the molten metal upwards and above the molten opening.

The disadvantage of the solution is that the molten metal is only put in place after a long journey, where gas absorption, oxidation and slag production occurs, thus reducing the porosity and lack of compactness of the workpiece. Due to this, the molten metal cannot completely absorb the complex shape. due to its surface tension, the shape fidelity of the workpiece can be objected to.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above shortcomings, i.e. to provide a cheap, economical, fast and inexperienced process for producing a precise wax pattern, and for precision casting .

SUMMARY OF THE INVENTION The present invention relates to a process for producing wax samples economically and to a device for precision casting of parts of unimpaired quality.

The object of the present invention is to provide a master sample of vulcanization-resistant and form-retaining material, place the master sample in a crude rubber, squeeze and cure it, and then extrude the cured rubber into a molding die.

The object of the invention is further solved by the device mentioned in the introduction, wherein the stand is pivotable by means of a motor, besides its pivot point there is a metal molten dispenser and a fixed molding where the molten metal dispenser is disposed radially a molten metal dispenser melting crucible with a high frequency coil disposed around it, and a molding coupling at its open end.

The invention will now be described in more detail with reference to the following exemplary embodiments. In the drawing it is

Figure 1 illustrates, in accordance with the process of the present invention, a preparation of a waxin tin, a

Figure 2: Masterpiece with an enema, a

Figure 3 would vulcanize and highlight the master wax after the cut wax pattern,

Figure 4 illustrates a device according to the invention prepared for precision casting and

Figure 5 shows the above apparatus during precision casting.

In the process of the present invention, a master sample 2 is made of vulcanization-resistant and form-retaining materials such as metal. The master sample 2 is inserted into the raw rubber, preferably two rubber sheets are published. Insert the whole into the frame and squeeze the rubber sheets from the top and bottom sufficiently with the aid of a vulcanizer. The vulcanization is then carried out, and the vulcanized rubber, which is in fact a wax blade 1, is removed from the frame 5, cut and the master sample 2 is extracted from the two halves 3, 4. The cut rubber beads 3, 4 are joined together to obtain the wax sample 1 and the wax is filled into it, after which the wax sample 1 is broken down into the rubber sheets 3, 4, leaving the finished sample.

The molding stand 6 of the device according to the invention is pivotally formed. In addition to the pivot 7 of the rack 6, a molten metal feeder 8 and a die 9 are provided. The molten metal feed dispenser 8 is arranged on the stand through a support structure 12 which provides radial tilt. The metal melt dispenser 8 is formed of a melting crucible 10 and a high-frequency coil 11 arranged around it. At the open end of the molten metal dispenser 8, it is secured by a coupling 13 by means of a casting opening 9 of the casting pattern 9.

The operation of the device according to the invention is described below.

Into the melting cup 10 is inserted the metal needed for the precision casting, usually in the form of granules. Voltage is applied to the high frequency coil 11, the metal suddenly melts and the semi-melt parameters are checked in a manner known per se.

The mold 9 is then fixed by means of the coupling 13. and open the high frequency coil 11 from the power source, and at the same time switch on the electric motor for rotating the fixture (not shown).

Then, accelerating around the pivot point 7 of the rack 6 is good for rotation. The resulting centrifugal force, through the support 12, tilts the metal melt dispenser 8. radially so that metal melters are injected into the mold 9.

In order to improve the operating conditions, the counter 6 has a counterweight 14 arranged against the metallol scavenger feeder 8.

In particular, the inflated state, that is, the sputtering salt of the molten metal in the mold 9, is illustrated in Figure 5.

From the shape of the 9 self-tinters and the amount of metal melts /)! and, depending on its nature, the rack 6 is rotated further until freezing occurs.

Then stop the R stand and remove the mold 9 from which the cast is removed.

An advantage of the device according to the invention is that the molten molten material is injected into its place by centrifugal force, that is to say, each submodule of the mold 9 is injected into it, thereby producing a solid, shape-free and inclusions-free casting.

If the die 9 is preheated, it is possible that the die is heat-treated simultaneously, thus providing a very economical and fast production.

Claims (2)

PATENT CLAIMS 1. Process for the preparation of wax minl. For 5 chairs, where the wax mold is cast, cooled and raised, characterized by the fact that it first lyses in mesterin in a bowl. (2) making a vulcanization. stick and shape made of support material, insert the sample (2) 10 press and culminate, then culculate. winding rubberized mcslerminla. (remove and cut the rubber bands (3, assemble. 2. Late 7th, mainly complicated boiling 15 and smaller parts with precision self-aligning stand and self-propelled feeder, characterized in that the stand is rotatably rotatable by a motor (fi), at its pivot point (7) 20 has a metallic game feed dispenser (8) and a fixed pattern (9) thereof, wherein the metallized game feed dispenser (8) is disposed radially on the pivoting stand (0), the phono game feeder (8) from melting pot (10), A holding device (12) for rotating the high-frequency scan (11), located around 25, and a switching device (13) for receiving a casting sample (9) are formed at the open end.