Metal working – Method of mechanical manufacture – Roller making
Patent
1995-05-03
1998-05-26
Cuda, Irene
Metal working
Method of mechanical manufacture
Roller making
298953, 492 30, 492 48, B23P 1500
Patent
active
057550336
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a roll press, especially for crushing very abrasive materials, comprising at least two press rolls of which each includes a wear layer arranged on a basic body, the wear layer comprising substantially plane zones of a highly wear-resistant material and the spaces between the highly wear-resistant zones being filled with a material of different wear resistance.
BACKGROUND OF THE INVENTION
Roll presses have been widely used in the technical field, and their intended uses can substantially be divided into three groups, i.e., briquetting, compacting and crushing. In all of the three applications the press rolls exert a more or less great pressure load on the materials to be processed. Depending on the profiles of the press rolls, there will be a sliding load on the roll surface in addition to the pressure load. The intensity of the sliding load substantially depends on the amount of the pressure load on the rolls, the profile of the roll surface and the properties of the materials to be processed. Such a load may cause severe wear on the rolls, especially in the case of great pressing forces.
High-alloy steels have especially been used in the prior art for reducing wear during briquetting and compacting, deposit welding during compacting and briquetting and crushing. With these kinds of wear protection, however, a considerable decrease in the service life was observed whenever especially strongly abrasive materials, such as glass powder, metallurgical slag or iron or non-ferrous metals had to be processed. As far as crushing is concerned, an autogenous wear protection is known in the case of which the roll surface is covered by particles of the material to be processed that are deposited into the spaces between knobs arranged on the roll surface. Such an autogenous wear protection is not suited for briquetting and does not prevent the embedded, fine-grained particles of the material to be processed from bursting. As far as deposit welding is concerned, there are restrictions imposed by the process with respect to the alloy composition of the welding material.
A generic roll press, especially a pulverizing roll, is known from EP-A-0516952. This document describes a roll press in which numerous basic bores into which pin-shaped material pieces are inserted are arranged in the circumferential area. The main part of a respective pin-shaped material piece is located in the basic roll body while the rest projects from the body. The spaces of the pin-shaped material pieces projecting in hedgehog fashion on the basic roll body can be filled with a ceramic material mixed with plastics. Since the wear-resistant material pieces wear normally at a slower pace than the material in the spaces, a profiled roll surface is formed during operation. The advantage is an improved introduction power and thus the achievement of increased throughput. The production of such known roll presses is, however, very time consuming due to the provision of the numerous basic anchorage holes in the basic roll body and thus entails great costs. Furthermore it is very likely that pins will escape with this type of solution.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a roll press of the above-mentioned kind which has a long service life and can be used for all kinds of applications (briquetting, compacting and crushing) and simply produced.
The object of the invention is attained in that the material for the spaces is a composite material which is adapted to be sintered, and that the highly wear-resistant zones are formed from hard bodies made by hot-isostatic pressing, the material for the spaces and the material for the wear-resistant zones being bonded to the basic body in a hot-isostatic pressing operation, and the wear resistance of the material for the spaces being substantially slightly greater or smaller than the wear resistance of the hard bodies in accordance with a desired profile which will obtained by wear.
Hence, the wear layer accordin
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Gunter Harald
Plagemann Werner
Schutze Wolfgang
Cuda Irene
MacDonald Thomas S.
Maschinenfabrik Koppern GmbH & Co. KG
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