DE1964167C3 - Process for the production of a mold surface by metal spraying - Google Patents

Description

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The invention relates to a method for The invention is particularly in the manufacture

Production of a mold surface by metal injection molding, positioning of molds suitable for injection molding according to which a metal on a model that is little-used. These forms are commonly called At least one part of a mold cavity is known and consists of two has zende shape, sprayed on and the halves that are expedient according to the invention formed Metal shell made separately after back lining with a process according to the invention and then Carrier and support material can be assembled from the model. Alternatively, a is lifted. Half by the method according to the invention

The metal spraying is a quick and easy 30 put and this first half as a model or Procedure to be used for the production of mold patterns for the other mold half, surfaces, but generally produces porous metal- the first half is manufactured and with a support structure, The material can absorb, provided they are provided as material, on the mold surface or Form surfaces are used. Surface of the shell on a layer of material

There is a process for the production of resin-35 which is brought to the desired shape hollow-bonded Known metal objects in which space is defined, which is the mold surface for the a layer of thermosetting resin on a Mo- second half forming metal layer on this Madell applied and then a metal shell is sprayed over material. This second metal layer The model can then be injected into the deposited resin layer with a carrier and support material is so that the metal balls in the shell are lined in 40, so that they interlock without damage and can be conveyed firmly embedded in the resin; the layer can also will. It was found that the hot gel impregnated with a resin according to the invention molten metal will harden the quality of the deposited.

The metal shell is around a model or a

Defect in the surface layer of the object 45 pattern of the object to be molded formed, hired. To avoid these difficulties the model is made in any way be presented in connection with this procedure and made of any suitable material, a refrigerated room or a dry stand, provided it is under the conditions at Using ice bath when spraying metal, however, does not adversely affect metal spraying. The this inevitably leads to additional costs and to after- 50 Model can be made of wood, metal, plaster of paris, synthetic share in handling. Thermosetting material, thermoplastic material

The object of the invention is to provide a process for the raw resins, rubber, in particular silicone input to create the genus described, the rubber, wax, plastillin, clay or glass reinforcement flawless surface of the mold on which the polyester resin can be produced. It will be pre-model facing side ensured and simply pulled 55, the model on a base body is in progress. Wood or metal, the angled edge

This object is achieved in that the now has, which form a device through which the wedge more of the exposed surface of the metal shell in sprayed-on metal coating around the pattern; is impregnated with a curable resin in a known manner. The model should contain cooling tubes that look like this and then after the resin 60 has cured, as close as possible to the surface to be sprayed an additional metal layer should be electrolytically fixed on it. The model is also advantageous is deposited. Because the resin only after the me- with a water-soluble release agent, such as Tallspritzen is applied, there is no danger of polyvinyl alcohol being splashed before the metal on the surface it is decomposed by the heat of the metal. The injection takes place. The release agent allows Resin penetrates into the pores of the metal shell and the metal shell can be easily lifted from the model, protects it from corrosion and closes when it is immersed in water; Furthermore the surface. The additional metal layer prevents the means from being properly laid down Damage or contamination of the mold - initial coating from the sprayed metal.

3 ^ ₄

The metal shell can be produced by being molded, coated with a metal layer. This the fact that metal is melted with compressed air. Metal layer is sprayed on by electrolytic deposition or that manure is formed in the flame spray process and provides a smooth surface, works in the flame spraying process against which the shaped body is formed. Voizugs-Sehalen however, they are often very porous, so that the impregnated shell is wise with a layer the invention in particular with a flame spray coating of copper, nickel or chromium. Age procedure Manufactured metal shells, when native, the shell can be made with a number of layers which are coated according to the inventive method; a preferred form of a drive an impregnation with a hardenable resin impregnated zinc shell is with a copper die Seals pores, which prevents the too io layer from being coated with a first layer Forming material in the metal shell penetrates it nickel and then another layer of chrome The shell can be plated from any metal.

be asked; However, it is preferred to use the shell. The metal shells are fragile, so that in the flame spraying process with zinc as the metal it is necessary to provide a reinforcement, since this material requires particularly precise measures to ensure that the model surface is reproduced . An on-shape can be used in molding operations where a suitable metal is aluminum because it is easily subjected to high pressures. This is and has little tendency to crack and furthermore a high one is particularly important when the mold has melting temperature, which means that higher molding processes are to be used in injection molding processes. The temperatures can be applied; about ao type the necessary backing depends on the addition can be aluminum with a high rate up usage mode from the mold. Should the form inject as an example. Preferably, the metal shell has at least a thickness of ½ cm when vacuum forming thermoplastics, so that the mold can be used in fabrics or in rotary pressing subjected to 15 high pressures;. the necessary support thickness of - ⁵⁴ ACm If the impregnated cup can by a simple frame structure zoom closing electroplated, the plating is to be beige leads For example, the shell preferably has a thickness of ° · ^β '/ ιοοβ bis - ". / looocm with cement, plaster or an epoxy resin behind, feeds.

The best way to impregnate the metal 30 Unless the impregnated metal shells after the

shell with a curable resin is to use the invention as the shape boundary surfaces of injection molding

Scliale is to be used for casting molds in a bath of liquid resin, the shell should also be used

dive; the resin can be back-fed in the form of a solution or a material through which the

a dispersion or can withstand high pressures due to its shape. Form

Be heated beyond melting point; Depending on the type of 35, the high pressures as a result of injection of the

Resin is the most favorable measure in each case thermoplastic material in the form as well as the

hit. The shell impregnated with the resin is subjected to forces when the two halves of the

Taken from the resin bath, resist over-injection mold for removal. With the conventional

Injection molding process, the thermoplastic material is washed from its surface.

and then dried. As resins, materials are cooled after injection into the mold;

uses those that can be cured; there? should be the impregnated according to the invention

preferred materials are epoxy resins, polyester metal shells when used in injection molds

resins and amine-aldehyde or phenol-aldehyde can be stored with cooling tubes.

Condensation resins. The resin should be over a preferred method of manufacture

The material to be molded is inert and is used in the 45 molding of molds for the injection molding process

Temperatures must be stable, but this is not important, the metal shell for easy transport

tig when the impregnated shell is then plat- with a first layer of reinforcement material

is animalized. back lining and then the reinforced shell

After treating the impregnated metal into a pressure-resistant back lining, for example shell to harden the resin, what example 50 concrete to use. This way of working has the proof by heating to harden a thermoset part that is in the most direct back lining material or cracks formed by cooling for hardening as a result of the first layer of association thermoplastic material, the reinforcement material cannot go into the metal shell, is the side against which the shaped body is placed.

Claims (1)

J area for cases where the curable resin is used Could be decomposed to the film temperatures, in addition, a particularly hard Method of making a molding surface is obtained that is wear-resistant by metal spraying, according to which a metal is on 5 against polymer erosion. a model comprising at least one part of a metal coating is known Mold cavity delimiting shape has to be sprayed onto a carrier material and the metal shell formed in this way and then immediately on the carrier material after the backing with a carrier and facing away from the metal support layer-a lacquer support material is lifted from the model, 10 or a color for the closing of the pores characterized in that the now- to bring, with the aim that from the outside more exposed surface of the metal shell in no corrosion-promoting materials reach the known way with a curable resin in the carrier material and under the Spntzschicht impregnated and then initiate a corrosion process after hardening,
of the resin thereon an additional metal layer 15. It is also known, in the case of compressor housings, to be electrodeposited. whose inner surface with a sprayed-on Me metal layer is coated, this porous metal layer with a thermal resistant thermal plastic resin material to coat the * o Seal pores and prevent corrosion of the casing