DE2628600A1 - FOUNDRY MODEL EQUIPMENT, PARTICULAR MODELS OR CORE BOXES - Google Patents

Description

Foundry pattern equipment, in particular patterns or core boxes

The invention relates to a foundry pattern device. tion, especially models or core boxes, which are subject to abrasion exposed surfaces are provided with a nickel layer.

It is known (DT-PS 2 154 895), models and core boxes made of an iron or aluminum alloy and electrolessly nickel-plating the surfaces exposed to abrasion. Although such models or core boxes meet the demands placed on them, they are only then economically viable represented when parts are to be cast in very large numbers. For smaller quantities, these models or Core boxes too expensive and too complex.

The object of the present invention is models or core boxes to create that have high abrasion resistance and good dimensional stability, but also priced and dated Outlay are cheaper. The object of the invention is achieved by the following features:

709852/0478

MOOO 9.74 pg

F 350/1

KJödcner-Humfaoldt-DeutzAG ZABVSnIBJ -y £ - June 11, 1976

. D 76/2?

a) The model device has a model core, which is applied by means of a surface layer casting process Front cast layer is provided from thermosetting, heat-resistant synthetic resin;

b) the model core is made of thermosetting, heat-resistant synthetic resin if necessary with backfilling, if necessary, e.g. for large models, additional reinforcement elements, e.g. made of metal, are built in;

c) the model core are prior to applying the at Frontgußschicht Nickelbadtemperatur, preferably heat-treated between 90 to 110 ⁰ C, depending upon the resin material until shrinkage and warpage of the model core is substantially equal to zero.

Although it is known to produce model cores from resin concrete and to provide them with a front cast layer, it has been shown, however, that such models can be nickel-plated, but that they are unusable after nickel-plating because they are significant Show distortion and significant changes in shape. A large amount of shrinkage was also found. According to the invention

709852/0478

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Klöckner4fombo) dH> eufzAG A & B ^ jKl & ii »- 3Γ- 11.6.1976

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These disadvantages can be overcome by installing a reinforcement body in the model core by using heat-resistant synthetic resin and fix it by heat treatment of the model core. With good Success was achieved as a heat-resistant synthetic resin for the front cast layer Araldit CW 216 with hardener HY 216 and as heat-resistant synthetic resin for the model core Araldit LW 561 with hardener HY 561 from Ciba-Geigy used. An essential part of the inventive feat is these synthetic resins, which so far were not used to create foundry models, to be applied in the present case. Through the heat treatment of the model core in the range of the nickel bath temperature is achieved that when nickel-plating the synthetic resin Shrinkage occurring at higher temperatures is preferred, so to speak, so that this shrinkage is achieved by applying the front cast layer can be compensated and no longer occurs when nickel-plating.

In a further embodiment of the invention it is proposed that the surfaces of the model equipment exposed to abrasion are provided with a copper layer before nickel-plating. Through this Copper layer ensures that the operator can determine with simple means where and whether the nickel layer is worn out, so a new nickel plating

709852/0478

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30000 9.74 pg _{F360 / 1}

Klödoier-fkjmboidt-CeutzAG £ & E% .IH! O -y * ~ June 11, 1976

' D 76/27

can be made. If the copper layer cannot be seen, the model is OK.

According to a further proposal of the invention, the reinforcing body is preferably made of a steel wire Made of steel mat, to which fastening sleeves and centerings are attached.

To increase the warpage and dimensional stability of the model, it is proposed that the front cast layer cover the entire model core and after the last heat treatment has the properties required for nickel plating. A particularly favorable, more dimensionally stable, free from distortion and shrinkage The model structure arises when the model core is built up in several layers, the outer layer being the entire Model core encloses and consists of a glass fiber reinforced synthetic resin layer and the subsequent layer takes up the reinforcement body, made of synthetic resin with glass chips and backfill, e.g. aluminum grit and synthetic resin, is backfilled. The outer layer also becomes the laminate layer and the stress compensation layer underneath called.

709852/0478

Klöckner-Humboldt-DeulzAG 2 & DSÜH! O - / Γ - 11.6.1976

O. D 76/27

To further explain the invention, reference is made to the drawing, in which an exemplary embodiment is shown in a simplified manner is. Show it:

1 shows a section through a model according to the invention from which the structure can be seen,

FIG. 2 shows a section of the surface of the model according to FIG. 1 corresponding to the circle denoted by X, in enlarged scale,

3 shows a plan view of the reinforcement body designed as a steel mat and

FIG. 4 shows a section through the model according to line IV - IV in FIG. 3.

In FIGS. 1 to 4, as far as shown, 1 denotes a reinforcing body which is designed as a steel mat and which is flat is. The reinforcement body 1 is in a layer 2 made of synthetic resin with glass chips, which also acts as a stress compensation layer can be called embedded. Between the layer 2 and the reinforcement body 1 is a, essentially, the backfill 3 forming the model contour is provided, the. ·

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30000 9.74Dg '' F3H / 1

KIöckner-HumboIdt-DeutzAG ZAtT ^ ETaU ^ - ^ -. June 11, 1976

D 76/27

consists of aluminum powder with synthetic resin. The outer layer 4, which is the outer skin, adjoins the layer 2 on the outside of the model core and is made of synthetic resin with glass fiber mat reinforcement. Within particularly far protruding projections (right side of Fig. 1) is in the model core an aluminum piece 4a is used, which is embedded in the layer 2. It serves as a reinforcement for air pipes.

The materials described so far form the model core, which is ^{heat-treated in a temperature range from 90 to 110 0} C, and so long or so often until no further shrinkage and warping occurs, so that no change in shape during electroless nickel plating or previous copper plating entry. The model is then provided with a front cast layer 6 using the surface layer casting process, which surrounds the entire model core and thereby also contributes somewhat to the dimensional stability. The repeated heat treatment achieves optimal properties of the front cast resin. Then the model is copper-plated and then nickel-plated. The copper plating is also preferably carried out without current. These layers cannot be seen in FIG. 1 and are shown in FIG. 2 as thick lines.

709852/0478 - 7 -

30000 9.74 pg _{F360 / 1}

Klöckner-Humboldt-DeutzAG 2ίΛLr ^ S ^- S U ^ -ff - 11.6.1976

2 D 76/27

262860Q

As can be seen from FIGS. 3 and 4, the reinforcement body 1 is designed as a steel mat which is made of steel wires 7 which are welded together. On the ends and on Fastening sleeves 8 and centerings 10 are cast in between the reinforcement body 1 and have no direct connection to the steel wires 7, but are surrounded by tabs 9 attached to the steel wires 7. This is a sufficient Fixing and centering of the model on a base plate possible.

It should be noted that the features according to the invention not only in foundry models but also in other models, which are coated with a nickel layer, for example in the shoe industry, can be used.

709852/0478

30000 9.74 pg _{F3M / 1}

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Claims (5)

Klöckner-Humboldt-DeutzAG ΔΙ% 1Η1Ο 5000 Cologne 80, June 11, 1976 Our reference: D 76/27 APT N / Ro 262860Q Patent claims 1. Foundry pattern device, in particular patterns or core boxes, the surfaces of which are exposed to abrasion with a Nickel layer are provided, characterized by the following features: a) The model device has a model core (1-4a), which is cast using a surface layer casting process applied front cast layer (6) made of thermosetting, heat-resistant synthetic resin is provided j b) the model core (i-4a) is made of thermosetting, heat-resistant synthetic resin if necessary with backfilling (3), with additional reinforcement (1), e.g. made of metal, installed if necessary are; c) the model core (1-4a) prior to applying the Frontgußschicht (6) at Nickelbadtemperatur, preferably heat-treated between 90 and 11O ⁰ C, depending upon the resin material until shrinkage and warpage of the model core (1-4a) is substantially equals zero. 709852/0478 COO 9.74 pg F 360/1 Klöckner-Humboldt-DeulzAG ΔΑ tr & .iniIU? ~ Jfi - June 11, 1976 D 76/27 2 foundry pattern device according to claim 1, characterized in that that the surfaces of the model equipment exposed to abrasion are provided with a copper layer before nickel-plating are. 3. Foundry pattern device according to claim 1 or 2, characterized in that the reinforcing body (1) preferably consists of one from steel wire (7) made of steel mat, attached to the fastening sleeves (8) and centering (10) or which is attached to a core box. 4. foundry pattern device according to one of claims 1 to 3, characterized in that the front cast layer (6) the entire Model core (1-4a) encloses. 5. Foundry pattern device according to one of claims 1 to 4, characterized in that the model core (1-4a) has a multilayer structure, the outer layer (laminate layer) enclosing the entire model core (1-4a) and consisting of a glass fiber reinforced synthetic resin layer and the adjoining layer (2) (stress compensation layer ) takes the reinforcement body (1), made of synthetic resin and glass chips and is backfilled with backfill, for example aluminum grit and synthetic resin _{/ is} (3). 709852/0478