A region (from the word “pour” [1] ) - excess material remaining on the part after processing . A region around the casting (including during molding of plastics) in the molds occurs along the demount line of the mold or mold [2] due to a small opening of the mold when filling it with liquid metal or a thermoplastic polymer. In a subsequent technological operation, the flake is removed by machining, for example, metal castings are chopped off during cleaning of the casting.
Modern foundry molds and molds are designed in such a way as to minimize flaking [3] .
A region around the stamping is formed as a result of extrusion of excess metal from open dies (cut off on edging presses or removed by processing with an abrasive tool).
A flash during welding is a material that exits the weld and accumulates around the seam.
The reasons for the appearance of an excessive flash [4] :
- defects and contamination of the clamping surfaces of the mold;
- the pressure in the mold exceeds the closing forces in the process of pressing and holding;
- low viscosity of the melt of the material due to going beyond the temperature range recommended by the manufacturer of the material;
- displacement of mold elements during filling;
- insufficient exhaust gas.
Notes
- ↑ T. S. Kogotkova. National sources of Russian terminology. - M .: Nauka, 1991 .-- 120 p. - ISBN 5-02-011079-5 .
- ↑ David Kazmer (2007). Injection mold design engineering. Hanser Verlag. p. 70. ISBN 978-1-56990-417-6 . Retrieved April 15, 2011.
- ↑ Bozzelli, John "An Expert Tells How to Stop Flash," Plastics Technology , July 2004, accessed May 9, 2011.
- ↑ GOST 29077-91
Literature
- Obloy - an article from the Great Soviet Encyclopedia .
- A bummer . // “Metals and alloys. Handbook. ”Edited by Yu. P. Solntsev; NPO Professional, NGO Peace and Family; St. Petersburg, 2003
- M. Bichler. Injection molding process parameters. Analysis and optimization. M.: Mannesmann Demag Service, 2001 .-- 130 p.
- Plastics processing / Schwartz O., Ebeling F.V., Furt B .; under the editorship of A. D. Panimatchenko. - St. Petersburg: Profession, 2005 .-- 320 p.