EP 0052380 A3 19820915 - TOOL FOR SHAPING ARTICLES
Title (en)
TOOL FOR SHAPING ARTICLES
Publication
Application
Priority
DK 494080 A 19801119
Abstract (en)
[origin: EP0052380A2] A tool for shaping articles, such as tools for drawing, bending, and vacuum shaping, e.g., for making automobile body parts, has an active shaped surface part which is made by casting a cement-bound material (15) directly against the corresponding surface part of the model (12). This cementbound material (15) has a coherent matrix comprising A) homogeneously arranged inorganic solid particles of a size of from about 50 ANGSTROM to about 0.5 mu m, or a coherent structure formed from such homogeneously arranged particles, and B) densely packed solid particles having a size of the order of 0.5 - 100 mu m and being at least one order of magnitude larger than the respective particles stated under A), or a coherent structure formed from such densely packed particles, the particles B preferably being Portland cement particles. Particles A are preferably ultrafine silica particles formed by growth from vapour phase and are substantially densely packed in the voids between the particles B. Particles A are especially present in an amount of 10 - 30% by volume, calculated on the combined volume of the particles A + B. Composite material for forming the matrix typically comprises Portland cement, ultrafine silica, water in low proportion, and a concrete superplasticizer in high proportion, optionally with additional bodies such as fibers, and is easily shapeable. Preferably, matrix additionally comprises particles which are of a strong material such as refractory grade bauxite. and is reinforced. Tool is easy to make and has a long useful life.
IPC 1-7
IPC 8 full level
B21D 37/01 (2006.01); B21D 37/20 (2006.01); C04B 14/02 (2006.01)
CPC (source: EP)
B21D 37/20 (2013.01)
Citation (search report)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0052380 A2 19820526; EP 0052380 A3 19820915; AU 7806481 A 19820607; BR 8108879 A 19821013; JP H0470097 B2 19921110; JP S57501771 A 19821007; NO 822468 L 19820716; WO 8201674 A1 19820527
DOCDB simple family (application)
EP 81109785 A 19811119; AU 7806481 A 19811119; BR 8108879 A 19811119; DK 8100103 W 19811119; JP 50364581 A 19811119; NO 822468 A 19820716