DEP0003315BA - Manufacture of magnetizable cores from powder particles - Google Patents
Manufacture of magnetizable cores from powder particlesInfo
- Publication number
- DEP0003315BA DEP0003315BA DEP0003315BA DE P0003315B A DEP0003315B A DE P0003315BA DE P0003315B A DEP0003315B A DE P0003315BA
- Authority
- DE
- Germany
- Prior art keywords
- powder particles
- manufacture
- mixing
- additives
- magnetizable cores
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002245 particle Substances 0.000 title claims description 10
- 239000000843 powder Substances 0.000 title claims description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Description
Zur Herstellung magnetisierbarer Kerne aus Pulverteilchen werden letzteren je nach dem verwendeten ferromagnetischen Werkstoff verschiedene Mittel zugesetzt, welche den verschiedensten Zwecken dienen. So werden z.B. Bindemittel zum Zusammenhalten der einzelnen Pulverteilchen beim Pressen und/oder die Gleitfähigkeit der einzelnen Pulverteilchen erhöhende Fliessmittel und/oder zur Verfestigung der Kerne nach dem Pressen dienende Aushärtemittel zugesetzt. Sowohl bei dem Mischen mit diesen Zusatzmitteln als auch bei der durch Anwendung der Fliess- und Aushärtemittel gegebenen Möglichkeit des sogenannten Strangpressens sind noch Lufteinschlüsse zwischen den einzelnen Pulverteilchen und den Zusatzmitteln bzw. in der gepressten Kernmasse vorhanden. Um diese Lufteinschlüsse zu beseitigen und damit höhere Kerndichten bei grösserer Gleichmässigkeit der Kernmasse zu erzielen, sowie Rissbildungen beim Trocknen, Aushärten oder Sintern zu vermeiden, wird erfindungsgemäss vorgeschlagen, beim Mischen der Pulverteilchen mit Zusatzmitteln, insbesondere mit Bindemitteln und/oder Fliessmitteln und/oder Aushärtemitteln, den Mischvorgang und/oder bei der Kernherstellung aus der durch Mischung der Pulverteilchen mit Zusatzmitteln erhaltenen Kernmasse mittels Strangpressen den Pressvorgang im Vakuum, vorzugsweise unter Anwendung der in der keramischen Industrie üblichen Massnahmen, vorzunehmen.To produce magnetizable cores from powder particles, various agents are added to the latter, depending on the ferromagnetic material used, which serve a wide variety of purposes. For example, binding agents are added to hold the individual powder particles together during pressing and / or flow agents that increase the lubricity of the individual powder particles and / or hardening agents that serve to solidify the cores after pressing. Both when mixing with these additives and when using the flow and hardening agents, there are still air pockets between the individual powder particles and the additives or in the pressed core mass. In order to eliminate these air inclusions and thus to achieve higher core densities with greater uniformity of the core mass, as well as to avoid the formation of cracks during drying, hardening or sintering, it is proposed according to the invention, when mixing the powder particles with additives, in particular with binders and / or flow agents and / or hardeners to carry out the mixing process and / or during the core production from the core mass obtained by mixing the powder particles with additives by means of extrusion the pressing process in a vacuum, preferably using the measures customary in the ceramic industry.
Claims (1)
Family
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