SU436498A3 - METHOD OF HEATING METAL - Google Patents
METHOD OF HEATING METALInfo
- Publication number
- SU436498A3 SU436498A3 SU1492709A SU1492709A SU436498A3 SU 436498 A3 SU436498 A3 SU 436498A3 SU 1492709 A SU1492709 A SU 1492709A SU 1492709 A SU1492709 A SU 1492709A SU 436498 A3 SU436498 A3 SU 436498A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- pulse
- heating
- metal
- heating metal
- time
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title description 10
- 239000002184 metal Substances 0.000 title description 10
- 238000010438 heat treatment Methods 0.000 title description 8
- 238000000034 method Methods 0.000 title description 7
- 239000010410 layer Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Control Of Resistance Heating (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Description
1one
Изобретение относитс к области металлургии , а именно, к способам высокочастотного нагрева металлов.The invention relates to the field of metallurgy, namely, to methods of high-frequency heating of metals.
Известен способ нагрева металла импульсами тока частотой от 20 до 40 мгц с временем воздействи нагревательного импульса от 5 до 20 мсек с последующей самозакалкой вследствие теплоемкости и теплопроводности издели . В результате получают тонкозернистую структуру поверхности металла.A known method of heating a metal with current pulses with a frequency of 20 to 40 MHz with a time of exposure to a heating pulse from 5 to 20 msec, followed by self-hardening due to the heat capacity and thermal conductivity of the product. The result is a fine-grained metal surface structure.
По предлагаемому способу получают еще более тонкую структуру поверхности металла. Примен изобретение к углеродистым стал м получают высокоэластичпые закаленные структуры с твердостью до 68 HRc.According to the proposed method, an even finer structure of the metal surface is obtained. By applying the invention to carbon steel, highly elastic hardened structures with a hardness of up to 68 HRc are obtained.
Согласно изобретению это улучшение достигаетс путем применени мощного импульса с чрезвычайно крутым задним фронтом, а именно, когда врем спада задпего фронта импульса менее 1% времени действи импульса . При этом скорость включени нагревающего импульса включателем, тормоз щим возрастание мощности, меньпш, чем скорость, отключени , т. е. энерги непрерывно нарастает и резко спадает. Это позвол ет вследствие высокой теплопроводности металлов резко закончить нагревание поверхностного сло металла и также резко осуществить самозакаливание его.According to the invention, this improvement is achieved by applying a powerful pulse with an extremely steep falling edge, namely, when the fall time of the back edge of the pulse is less than 1% of the pulse action time. At the same time, the turn-on speed of the heating impulse by the switch, which inhibits the increase in power, is less than the speed, turned off, i.e., the energy continuously increases and decreases sharply. This allows, due to the high thermal conductivity of metals, to abruptly finish the heating of the surface layer of the metal and also to sharply self-harden it.
По предлагаемому способу в зависимости от удельного сопротивлени металлического сплава длительность нагревательного импульса составл ет от 5 до 20 мсек.According to the proposed method, depending on the resistivity of the metal alloy, the duration of the heating pulse is from 5 to 20 ms.
С увеличением длительности импульса увеличиваетс глубина проникновени тепла, однако скорость закалки уменьшаетс . металлическому сплаву соответствует определенное кратчайшее врем действи импульса, пиже которого дальнейшее повышение твердости невозмолСпо.As the pulse duration increases, the depth of heat penetration increases, but the quenching rate decreases. the metal alloy corresponds to a certain shortest time of the pulse, the fluid of which further increases the hardness of non-millpo.
Пар ду с длительностью импульса важно также поддерживать строго посто нной установленную величину энергии импульса.A pair with a pulse duration is also important to maintain a strictly constant set value of the pulse energy.
Например, дл получени тонкозернистой структуры на поверхности углеродистой стали (содержание углерода 0,9%) необ.ходимо длительность строго пр моугольного импульса воздействи выбрать равной 15 мсек, рабочую частоту тока 27,12 мгц.For example, to obtain a fine-grained structure on the surface of carbon steel (carbon content 0.9%), the duration of a strictly rectangular pulse of exposure should be chosen to be 15 ms, the working frequency of the current is 27.12 MHz.
При этом толщипа полученного белого сло равна приблизительно 0,5-0,8 мм; твердость при вдавливании проверочного алмаза в белый слой соответствует //коз965 (965 по Викерсу ). Установлено также, что при нагреве металла по данному снособу в полученном закаленном слое отсутствуют трещины. 3 Предмет изобретени Способ нагрева металла импульсами тока qacTOTOE от 20 до 40 мгц с временем воздействи импульса от 5 до 20 моек, отличаю- 5 4 щийс тем, что, с целью обеспечени получени тонкозернистой структуры поверхности металла, примен ют импульс, врем спада заднего фронта которого менее 1 % времени действи импульса.The thickness of the obtained white layer is approximately 0.5-0.8 mm; hardness when pressing test diamond into the white layer corresponds to // goat965 (965 Vickers). It was also established that when the metal is heated by this method, there are no cracks in the obtained quenched layer. 3 Subject of the Invention A method for heating a metal with current pulses qacTOTOE from 20 to 40 MHz with an impulse exposure time from 5 to 20 washes, characterized by the fact that in order to obtain a fine-grained metal surface structure, an impulse is used which is less than 1% of the pulse time.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1957884A DE1957884C2 (en) | 1969-11-18 | 1969-11-18 | Process for producing extremely fine-grained metallic surface structures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU436498A3 true SU436498A3 (en) | 1974-07-15 |
Family
ID=5751424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1492709A SU436498A3 (en) | 1969-11-18 | 1970-10-29 | METHOD OF HEATING METAL |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5242725B1 (en) |
| CH (1) | CH528594A (en) |
| DE (1) | DE1957884C2 (en) |
| SU (1) | SU436498A3 (en) |
| ZA (1) | ZA707802B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2206816C3 (en) * | 1972-02-12 | 1981-12-10 | Früngel, Frank, Dr.-Ing., Zürich | Device for producing extremely fine-grained metallic surface structures |
| FR2183590A1 (en) * | 1972-05-12 | 1973-12-21 | Frungel Frank | Steel surface hardening - with current short pulse inductor |
| DE2851142C2 (en) * | 1978-11-25 | 1989-01-12 | Neturen Co. Ltd., Tokyo | Process for the production of a high-strength spring steel |
| DE19637513C2 (en) * | 1996-09-13 | 2001-06-07 | Fraunhofer Ges Forschung | Method and device for modifying metallic workpiece surfaces by electrical discharges |
-
1969
- 1969-11-18 DE DE1957884A patent/DE1957884C2/en not_active Expired
-
1970
- 1970-10-21 CH CH1559170A patent/CH528594A/en not_active IP Right Cessation
- 1970-10-29 SU SU1492709A patent/SU436498A3/en active
- 1970-11-17 JP JP45100801A patent/JPS5242725B1/ja active Pending
- 1970-11-18 ZA ZA707802A patent/ZA707802B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5242725B1 (en) | 1977-10-26 |
| DE1957884C2 (en) | 1974-05-16 |
| DE1957884B2 (en) | 1971-04-15 |
| ZA707802B (en) | 1971-08-25 |
| CH528594A (en) | 1972-09-30 |
| DE1957884A1 (en) | 1971-04-15 |
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