US2146987A - High frequency iron core - Google Patents
High frequency iron core Download PDFInfo
- Publication number
- US2146987A US2146987A US42825A US4282535A US2146987A US 2146987 A US2146987 A US 2146987A US 42825 A US42825 A US 42825A US 4282535 A US4282535 A US 4282535A US 2146987 A US2146987 A US 2146987A
- Authority
- US
- United States
- Prior art keywords
- core
- high frequency
- thread
- iron core
- frequency iron
- 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 - Lifetime
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 9
- 238000003825 pressing Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
- Y10T29/49076—From comminuted material
Description
I Feb. 14, 1939.
H. C. RIEPKA HIGH-FREQUENCY IRON coma Filed Sept. 30, 1935v Patented Feb. '14, 1939 2.14am men FREQUENCY mos cone Hellmuth C. Riepka, Berlin-Lichterfelde, Germany, assignor to Steam-Magnesia sellschaft, Berlin-Pankow, Germany Application September 30, 1935, Serial No. 42,825 In Germany October 25, 1934 dclaims.
This invention relates to high frequency iron cores.
It is the object of the invention to provide such cores in an improved form which insures particularly a simple and more economical production thereof.
, ,Cores of this type are, pressed from high frequency iron powder under high pressure, and the thread is as a rule produced during the pressing operation, since subsequent tapping, though possible, is not advisable for various reasons. As in all pressing operations, a burr is formed hereby on the core as a consequence of the separating slit between the top and bottom die and is particularly difllcult to remove, since, corresponding to the thread, it extends in zigzag fashion along both sides of the compressed core.
In the core formed according to the invention these troubles are completely eliminated. This success is attained by suppressing on two opposite sides of the core a part of the thread providing thereby plane flattenings extending up to or into the basic core having the root diameter of the thread and by pressing the core in such a position that the separating slit between the upper and lower die of the pressing tool. and thus the burr produced between them during pressing, is
located along these flattenings whence it can be readily removed. If the flattenings do not cut away only the thread but their planes lie still nearer to the center of the core, it is even possible to leave the burr where it is as then it doesnot project over the circumference of the thread and therefore cannot interfere with the function of the latter.
Although in the new core form a portion of the circumference of the core is not threaded, this is without practical importance, as the thread serves generally only for adjusting the core and has to carry only the weight thereof.
The device for carrying out the pressing process according to the invention is so constructed that the dies, into each of which one-half of the thread is to be-pressed, are only as broad. as the basic core, or slightly less so. Furthermore, by a corresponding construction of the pressing device, slots can be pressed at the same time into the ends of the cores by providing the press mold or the dies with projecting members corresponding to the dimensions of the slots.
By way of example and without restricting the invention to the embodiment shown, one form of the new core and the pressing device for its production is illustrated in the accompanying drawing, in which Figure 1 is a cross section of the pressing device; Fig. 2, a side view thereof; Fig. 3, a view of the die on an enlarged scale; Fig. 4, a view of the high frequency iron core, and Hg. 5, a plan of the core.
mimo- Referring to the drawing, in the press mold a the top die b and the bottom die 0 are movably arranged, each of them bearing one-half of the thread d to be pressed and being only as broad as the diameter of the basic core. It is evident that g burr forming at the points e of the core i during pressing can be easily removed, since merely projections on plane surfaces have to be taken away. If finishing is to be eliminated completely, it is only necessary to make the dies b and c somewhat narrower than the diameter k of the core of the thread. A burr developing at the dividing plane of the compressed iron powder core, may then remain where it is, as it does not interfere any more with the function of the thread.
The width I of the dies band 0 depends on the length of the iron powder cores to be pressed. If slots are to be pressed on the faces thereof, the press lining a is provided with continuous projections a engaging corresponding grooves h on the dies 11 and c. The projections a and grooves h are used also for guiding the dies b and c.
The press mold can be simplified by arranging slot forming projections a on the dies b and c as indicated in Fig. 3. Although this may lead to the formation of burr within the slot, it is not necessary to remove it, as it will be destroyed as a rule during theflrst adjustment of the compressed iron powder core by the screw-driver.
The invention is not limited to the embodiment described and illustrated by way of example in the drawing, but may be varied in different ways without exceeding its scope.
I claim:-
1. A compressed comminuted high frequency core of substantially cylindrical shape provided with a thread, opposite sides of the cylinder being flattened to at least the depth of the thread, said flattenings including the place where the burr is formed in pressing.
2. A compressed comminuted high frequency magnetic core in accordance with claim 1 and in which the flattening is to a depth slightly greater than the depth of the thread so that the burr even if not removed does not interfere with the function of the thread.
3. A compressed comminuted high frequency magnetic core in accordance with claim 1, a slot being provided in at least one of the ends of the core, said slot being parallel with the flattened sides of the cylinder.
4. A compressed comminuted high frequency magnetic core in accordance with claim 1, a slot being provided in at least one of the ends of the core, said slot being parallel with the flattened
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2146987X | 1934-10-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2146987A true US2146987A (en) | 1939-02-14 |
Family
ID=7987184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US42825A Expired - Lifetime US2146987A (en) | 1934-10-25 | 1935-09-30 | High frequency iron core |
Country Status (1)
Country | Link |
---|---|
US (1) | US2146987A (en) |
-
1935
- 1935-09-30 US US42825A patent/US2146987A/en not_active Expired - Lifetime
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2236953A1 (en) | STATOR CORE FOR ROTATING ELECTRIC MACHINERY AND METHOD OF MANUFACTURING | |
US2127131A (en) | Die for the production of box blanks | |
US2146987A (en) | High frequency iron core | |
US2302571A (en) | Method of making electrical laminations | |
US2084079A (en) | Screw | |
US2988032A (en) | Method of making core plug | |
US1978372A (en) | Hollow set screw and method of and apparatus for making the same | |
US3083928A (en) | Core plug | |
US3017789A (en) | Spinneret production | |
US4037641A (en) | Method of fabricating sewing machine needles | |
US2934727A (en) | Core construction | |
US1513972A (en) | Method of making laminations for transformer cores | |
US2481025A (en) | Method of making shafts having sheet metal journal surfaces | |
US1603488A (en) | Method of making grooved bushings | |
US2952071A (en) | Method of making an orifice | |
US2319544A (en) | Thread cutting tool | |
US3333623A (en) | Method of making the eye portion of needles | |
US3213727A (en) | Method of making core pieces | |
US2120320A (en) | Method of making finger rings and blank therefor | |
US801338A (en) | Method of making metal slugs. | |
DE112019006283T5 (en) | Core, stator and rotating electrical machine | |
US2223853A (en) | Method of producing body portions of electrical connectors | |
US1901584A (en) | Means for making core laminae | |
US1807166A (en) | Grooved bearing | |
US2652578A (en) | Wood screw manufacturing process |