PL424498A1 - Method for producing magnetic cores by pressing and sintering method - Google Patents
Method for producing magnetic cores by pressing and sintering methodInfo
- Publication number
- PL424498A1 PL424498A1 PL424498A PL42449818A PL424498A1 PL 424498 A1 PL424498 A1 PL 424498A1 PL 424498 A PL424498 A PL 424498A PL 42449818 A PL42449818 A PL 42449818A PL 424498 A1 PL424498 A1 PL 424498A1
- Authority
- PL
- Poland
- Prior art keywords
- pressing
- temperature
- recommended
- sintering
- coercivity
- Prior art date
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- Powder Metallurgy (AREA)
- Electroplating Methods And Accessories (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Sposób wytwarzania rdzeni magnetycznych metodą prasowania i spiekania proszku żelaza i środka poślizgowego do prasowania na gorąco oraz obróbki mechanicznej, impregnacji tworzywem i pokryciem galwanicznym, charakteryzuje się tym, że proszek żelaza o zawartości 1% - 5% Si z maksymalną zawartością zanieczyszczeń poniżej 0,2% z dodatkiem środka poślizgowego w ilości 0,5 - 1% poddaje się jednokrotnemu prasowaniu na gorąco w temp. 85° - 120°C zalecanej 90° - 120°C, przy ciśnieniu prasowania 500 - 800 MPa i zalecanym ciśnieniu prasowania 750 – 800 Mpa do uzyskania gęstości części zielonej w całym przekroju > 7,25 g/cm2. Wysokotemperaturowy proces spiekania prowadzony jest w atmosferze ochronnej 100% H2, w temperaturze 1250° - 1350°C zalecanej 1300° - 1330°C, przy czym punkt rosy atmosfery ochronnej wynosi min. -40°C. Czas spiekania w strefie wysokotemperaturowej wynosi 30 - 50 min, a osiągnięta koercja na półprodukcie wynosi < 60 A/m. W dalszym procesie obróbkę mechaniczną detalu wykonuje się przez toczenie, frezowanie, szlifowanie, metodami erozyjnymi lub kalibracją, usunięcie ostrych pozostałości materiału tzw. gratów następuje metodą trowalizacji (obróbki wibrościernej), mycia i suszenia, zaś uszczelnienie porów w spiekach następuje metodą Maldaner lub technologiami adekwatnymi, a operacją zamykającą proces jest niklowanie galwaniczne, przy czym po tych operacjach wyrób gotowy ma koercję < 100 A/m.The method of producing magnetic cores by pressing and sintering iron powder and a lubricant for hot pressing and mechanical processing, impregnation with plastic and electroplating, is characterized by the fact that iron powder containing 1% - 5% Si with a maximum impurity content below 0.2 % with the addition of a lubricant in the amount of 0.5 - 1%, subjected to one hot pressing at a temperature of 85° - 120°C, recommended 90° - 120°C, at a pressing pressure of 500 - 800 MPa and a recommended pressing pressure of 750 - 800 MPa to obtain the density of the green part in the entire cross-section > 7.25 g/cm2. The high-temperature sintering process is carried out in a protective atmosphere of 100% H2, at a temperature of 1250° - 1350°C, recommended 1300° - 1330°C, with the dew point of the protective atmosphere being min. -40°C. The sintering time in the high-temperature zone is 30 - 50 min, and the achieved coercivity on the semi-finished product is < 60 A/m. In the further process, mechanical processing of the detail is performed by turning, milling, grinding, erosion methods or calibration, removing sharp material residues, the so-called burrs are made by trovalization (vibro-abrasive treatment), washing and drying, and the pores in the sinters are sealed using the Maldaner method or appropriate technologies, and the closing operation of the process is galvanic nickel plating, and after these operations the finished product has a coercivity < 100 A/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL424498A PL234774B1 (en) | 2018-02-05 | 2018-02-05 | Method for producing magnetic cores by pressing and sintering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL424498A PL234774B1 (en) | 2018-02-05 | 2018-02-05 | Method for producing magnetic cores by pressing and sintering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL424498A1 true PL424498A1 (en) | 2019-08-12 |
| PL234774B1 PL234774B1 (en) | 2020-03-31 |
Family
ID=67549962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL424498A PL234774B1 (en) | 2018-02-05 | 2018-02-05 | Method for producing magnetic cores by pressing and sintering method |
Country Status (1)
| Country | Link |
|---|---|
| PL (1) | PL234774B1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253874A (en) * | 1976-11-05 | 1981-03-03 | British Steel Corporation | Alloys steel powders |
| EP0302430A1 (en) * | 1987-08-01 | 1989-02-08 | Kawasaki Steel Corporation | Alloyed steel powder for powder metallurgy |
| EP0457418A1 (en) * | 1990-05-16 | 1991-11-21 | Hoeganaes Corporation | An optimized double press-double sinter powder metallurgy method |
-
2018
- 2018-02-05 PL PL424498A patent/PL234774B1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253874A (en) * | 1976-11-05 | 1981-03-03 | British Steel Corporation | Alloys steel powders |
| EP0302430A1 (en) * | 1987-08-01 | 1989-02-08 | Kawasaki Steel Corporation | Alloyed steel powder for powder metallurgy |
| EP0457418A1 (en) * | 1990-05-16 | 1991-11-21 | Hoeganaes Corporation | An optimized double press-double sinter powder metallurgy method |
Also Published As
| Publication number | Publication date |
|---|---|
| PL234774B1 (en) | 2020-03-31 |
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