Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1997-12-19
1999-12-28
Mai, Ngoclan
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 65, 419 66, B22F 800
Patent
active
060077654
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of producing molded articles or moldings.
A number of methods are known for producing molded articles and finished parts. One possibility for classifying these methods is by the raw material that is used as well as the structure and properties thereof. In the context of the present invention, raw material means a material from which very different molded articles can be produced. Depending upon the respective method and method steps and the raw materials utilized, the molded articles that are produced have different characteristics.
The known methods for producing molded articles are extremely energy and cost intensive, not only with regard to the procedural techniques that are used but also with regard to the raw materials that are utilized. As a consequence of the extremely difficult handling of the methods and of the raw materials utilized, a directed influencing of the technological characteristics of the manufactured molded article is possible only to a limited extent.
It is therefore an object of the present invention to provide a method of producing molded articles with which, by selection of the raw materials or raw material compositions that are utilized, as well as by method steps that are adapted to one another and are also coordinated to the appropriate raw materials, a directed influence can be undertaken upon the technological characteristics of the molded article, so that the molded articles can be produced with the desired technological characteristics at low energy consumption and low cost.
SUMMARY OF THE INVENTION
To realize the objective of the present invention, a method is proposed whereby raw materials that have been ground or reduced in size are mixed together, are prepared with or have incorporated therein at least one binding agent or binder, are pressed into molds, and are hardened.
The method of the present invention utilizes raw materials that have been reduced in size, for example being in the form of granulates, powders, chips, shavings or dust. These can have various grain sizes and can be not only granular but also fibrous. The grain sizes should be in a range of from 0.3 mm to a maximum of 3.0 mm, whereby granulates and spherical shapes will be smaller than particles having indefinite edges. Leftover or recycled material can advantageously be used as the raw materials. Furthermore, it is particularly advantageous for the raw materials to be metals, especially scrap metal, any plastic, construction materials, for example mortar, plaster or cement, as well as organic materials, for example wood chips and paper fluff. Since the reduction in size of all types of material is part of the energy intensive procedural techniques and processes, the raw materials that are to be used should advantageously already be reduced in size. For this purpose, examples of suitable material are metal powder resulting from a dust collection or separation process, or for example grinding and drilling residue that is produced in the automobile industry, as well as similar residue having another origin, for example wood chips and paper fluff. In this way, on the one hand the energy required during the manufacture of molded articles is reduced, and on the other hand there is effected a practical reutilization or recycling of raw materials. If necessary, the raw materials that have been reduced in size can advantageously have different grain sizes and/or can comprise different types of raw materials. In this way, by means of a directed raw material composition, various characteristics of the molded articles that are to be produced can first of all be influenced, for example the density.
The raw materials that have been reduced in size are mixed together. In so doing, the materials are combined in such a way that they are substantially homogeneous, so that when any partial volume of the raw materials is extracted, it has an as uniform as possible composition of the individual raw material components. The size-reduced raw materials
REFERENCES:
patent: 3567811 (1971-03-01), Humphrey
patent: 3802902 (1974-04-01), Turner, Jr. et al.
patent: 3973922 (1976-08-01), Williams
patent: 4163000 (1979-07-01), Kashima et al.
patent: 4266921 (1981-05-01), Murray
patent: 4341559 (1982-07-01), Friedemann et al.
patent: 4399858 (1983-08-01), Kurabe et al.
patent: 4505750 (1985-03-01), Cowan
patent: 4541869 (1985-09-01), Maak et al.
patent: 4763720 (1988-08-01), Sakamoto et al.
patent: 4830611 (1989-05-01), Guntermann et al.
patent: 5162393 (1992-11-01), Griffin et al.
Exori-Import-Export GmbH & Co. KG
Mai Ngoclan
LandOfFree
Method of producing molded articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing molded articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing molded articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2380297