Method of producing forming tools
First Claim
1. A method of producing a forming tool having a mold shell of metal, the shell having a surface shaped by a pattern body and having a support body bonded to the rear face of the mold shell, which comprises preparing a pattern of predetermined shape, applying a first layer of metal on each side of said pattern to conform to the contour of said pattern, applying a second layer of metal by thermal spraying, the two metals forming a bond which is substantially mechanically inseparable, the first metal being soft and of low melting point, the second metal having high wear resistance properties, thus forming a two-part mold shell consisting of a male part and a female part on said pattern, each part consisting of a mold shell of said two metals, bonding the rear face of the mold shell to a support body material and then separating the male and female part from said pattern.
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Abstract
This invention relates to the production of a forming tool comprising a mould or part which is formed on a master surface and separating the tool from the latter, in which a relatively malleable metal is deposited as a relatively thin metal layer on the master surface such that that side of this layer which faces the master surface will assume the shape and structure of the latter, whereupon on this layer at least another layer of a relatively durable metal is deposited and bonded for forming a metal shell. A backing material is bonded on the shell and the shell and the backing material are separated as a unit from the master surface and used as the mould or forming part of the tool.
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23 Claims
- 1. A method of producing a forming tool having a mold shell of metal, the shell having a surface shaped by a pattern body and having a support body bonded to the rear face of the mold shell, which comprises preparing a pattern of predetermined shape, applying a first layer of metal on each side of said pattern to conform to the contour of said pattern, applying a second layer of metal by thermal spraying, the two metals forming a bond which is substantially mechanically inseparable, the first metal being soft and of low melting point, the second metal having high wear resistance properties, thus forming a two-part mold shell consisting of a male part and a female part on said pattern, each part consisting of a mold shell of said two metals, bonding the rear face of the mold shell to a support body material and then separating the male and female part from said pattern.
Specification