CN101106844A - Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction - Google Patents
Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction Download PDFInfo
- Publication number
- CN101106844A CN101106844A CNA2007100257114A CN200710025711A CN101106844A CN 101106844 A CN101106844 A CN 101106844A CN A2007100257114 A CNA2007100257114 A CN A2007100257114A CN 200710025711 A CN200710025711 A CN 200710025711A CN 101106844 A CN101106844 A CN 101106844A
- Authority
- CN
- China
- Prior art keywords
- electromagnetic induction
- metal sleeve
- sleeve pipe
- ferromagnetic metal
- powder metallurgy
- 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.)
- Pending
Links
Images
Landscapes
- General Induction Heating (AREA)
Abstract
Electromagnetic induction heating method for warm pressing in powder metallurgy and the heating device thereof are characterized in that alternating current generated by an electromagnetic induction heating driver passed through an electromagnetic coil to generate electromagnetic induction heat on a ferromagnetic metal sheath; and powder to be heated passed through the metal sheath and absorbs the electromagnetic induction heat on the metal sheath to rise temperature. The heating device for realizing the method has the advantages of simple structure, high heating speed, high heating efficiency, high temperature control precision, and easily realized connection with the existing power metallurgy presser and automatic operation.
Description
Technical field
The present invention relates to powder metallurgy technology, more specifically say so a kind of powder metallurgy warm-pressing electromagnetic-induction heating method and heater thereof.
Background technology
The temperature and pressure technology is low-cost new technology, the new technology of a pressing one-time sintering, and it can produce density and be not less than 7.25g/em
3The high-performance powder metallurgy part.Heating is the key problem in technology in the warm-pressing technology, and heater must provide accurate temperature control and can easily be attached on the existing powder metallurgy press and suppress, to reduce cost of investment.
The existing in the world manufacturing firm that can produce the temperature and pressure device, in the temperature and pressure heating system, mainly contain the EL-TEMP resistance-type temperature and pressure heating system of the common exploitation of North America HoeganaesCorp and Cincinnati Incorp, the common MICRO-MET that develops of LindeMetalteknik hot oil type temperature and pressure heating system, U.S. NorthAmeric Hoeganaes company and U.S. microwave material company that Sweden Linde Metalteknik company makes
TMThe temperature and pressure heating system; Domestic have South China Science ﹠ Engineering University to develop classification hot gas temperature and pressure heating system etc.The supply rate of heating powder, the homogeneity of temperature and stability are normally passed judgment on the sign of device quality, and above-mentioned several temperature and pressure devices respectively have advantage, still have technical deficiency, comprising:
1, resistance-type temperature and pressure heating system, hot oil type temperature and pressure heating system, hot gas temperature and pressure heating system firing rate are slow, and efficient is poor, thermal uniformity is poor, and volume is bigger, uses dumb.
2, microwave temperature and pressure heating system, firing rate is fast, temperature homogeneous, but equipment manufacturing cost costliness.
Summary of the invention
Technical problem to be solved by this invention is to avoid above-mentioned existing in prior technology weak point, provide a kind of simple in structure, firing rate is fast, the heat efficiency is high, accuracy of temperature control is high, be easy to realize being connected with existing powder metallurgy press and the powder metallurgy warm-pressing usefulness electromagnetic-induction heating method and the heater thereof of automation mechanized operation.
The technical scheme that technical solution problem of the present invention is adopted is:
Powder metallurgy warm-pressing of the present invention with the feature of electromagnetic-induction heating method is:
Flow through solenoid with the alternating current that produces in the electromagnetic induction heating driver and on the ferromagnetic metal sleeve pipe, produce electromagnetic induction heat;
Be heated powder and flow through in metal sleeve, the electromagnetic induction heat that absorbs on the metal sleeve is heated up.
Powder metallurgy warm-pressing of the present invention also is with the characteristics of electromagnetic-induction heating method:
The AC current frequency that flows through solenoid is 20Hz～300KHz.
The alternating current that flows through solenoid is the frequency conversion electric current, and its frequency is 20Hz～300KHz.
Powder metallurgy warm-pressing electromagnetic induction heater of the present invention is characterized in that:
Control circuit is set, comprises temperature sensor I and temperature sensor II on frequency converter, intelligent temperature adjusting apparatus, electromagnetic induction heating driver, the different detection position, and the solenoid in the output loop that is arranged on the electromagnetic induction heating driver of connecting;
The ferromagnetic metal sleeve pipe is set, is heated in the inner chamber that powder is in the ferromagnetic metal sleeve pipe, be provided with heat-insulation layer in the periphery of described ferromagnetic metal sleeve pipe, solenoid is wound on the ferromagnetic metal sleeve pipe, and is positioned at the appearance of heat-insulation layer.
Powder metallurgy warm-pressing of the present invention also is with the design feature of electromagnetic induction heater:
Temperature sensor I and temperature sensor II divide and are in axial locations different in the ferromagnetic metal sleeve pipe and the different radial position.
The periphery of ferromagnetic metal sleeve pipe is circle or polygon.
The inner chamber of described ferromagnetic metal sleeve pipe is one or more cavitys.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, apparatus of the present invention are simple in structure, utilize the controllable electromagnetic induction heating, and firing rate is fast, heat efficiency height (can reach 80%), homogeneous heating; Working temperature is adjustable between room temperature to 300 ℃, and the adjustment reaction time is short, and accuracy of temperature control can reach ± and 2 ℃.
2, apparatus of the present invention manufacturing is simple, and is easy for installation, uses reliably, is easy to realize being connected and automation mechanized operation with existing powder metallurgy press.
3, apparatus of the present invention low cost of manufacture not only, and use energy consumption little, energy-saving effect is remarkable, and price only is import resistance heating and heating system of hot oil price 1/5～1/8; With existing resistance heating and deep fat heating and energy saving more than 50%; The rate of heat addition improves 40～50% with the existing resistance heating and the deep fat rate of heat addition under equal power condition.The present invention will apply warm-pressing technology and play positive promotion, have the remarkable economical social benefit.
Description of drawings
Fig. 1 is powder metallurgy warm-pressing of the present invention electromagnetic induction heater schematic diagram.
Fig. 2, Fig. 3, Fig. 4, Fig. 5 are the multi-form ferromagnetic metal sleeve pipe cross sectional representation of the present invention.
Number in the figure: 1 frequency converter, 2 intelligent temperature adjusting apparatus, 3 electromagnetic induction heating drivers, 4 insulation materials, 5 ferromagnetic metal sleeve pipes, 6 are heated powder, 7 coils, 8 temperature sensor I, 9 temperature sensor II.
Below, in conjunction with the accompanying drawings invention is described further by embodiment:
Embodiment
Referring to Fig. 1, the powder metallurgy warm-pressing electromagnetic-induction heating method is to flow through solenoid 7 with the alternating current that produces in the electromagnetic induction heating driver to produce electromagnetic induction heat on ferromagnetic metal sleeve pipe 5 in the present embodiment; Be heated powder and flow through in metal sleeve, the electromagnetic induction heat that absorbs on the metal sleeve is heated up.
The AC current frequency that flows through solenoid 7 in concrete the enforcement is 20Hz～300KHz.
In order to realize adjustment, frequency converter 1 is set, the alternating current that flows through solenoid 7 is the frequency conversion electric current, its frequency is 20Hz～300KHz.
Figure 1 shows that heater structural representation in the present embodiment.
As shown in Figure 1, the setting of control circuit comprises temperature sensor I 8 and the temperature sensor II 9 on frequency converter 1, intelligent temperature adjusting apparatus 2, electromagnetic induction heating driver 3, the different detection position, and the solenoid 7 in the output loop that is arranged on electromagnetic induction heating driver 3 of connecting;
Ferromagnetic metal sleeve pipe 5 is set, is heated in the inner chamber that powder 6 is in ferromagnetic metal sleeve pipe 5, be provided with heat-insulation layer 4 in the periphery of ferromagnetic metal sleeve pipe 5, solenoid 7 is wound on the ferromagnetic metal sleeve pipe 5, and is positioned at the appearance of heat-insulation layer 4.
In concrete the enforcement, as shown in Figure 1, temperature sensor I 8 and temperature sensor II were in axial locations different in the ferromagnetic metal sleeve pipe 5 and the different radial position in 9 minutes.
As Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, the periphery of ferromagnetic metal sleeve pipe 5 is circle or polygon; The inner chamber of ferromagnetic metal sleeve pipe 5 is one or more cavitys.
In concrete the enforcement, electromagnetic induction adopts high-frequency induction, form induction heating driver 3 by high-frequency oscillating circuits and drive circuit control electric power semiconductor element IGBT pipe, intelligent temperature adjusting apparatus 2 selects for use WP-D905 intelligence from adjusting the PID adjusting apparatus, temperature sensor I, temperature sensor II select E type armoured thermocouple for use, and solenoid 7 is selected 1.5mm for use
2High temperature resistant wire coiled, ferromagnetic metal sleeve pipe 5 are selected common iron pipe for use or are contained the ferroalloy pipe of other element, and requirement is to have ferromagnetism; Wrapping up in heat-insulation layer 4 in ferromagnetic metal sleeve pipe 5 appearances, heat-insulation layer 4 can be selected fiber rock wool or aluminium silicate wool for use, and coil 7 is around the appearance of heat-insulation layer 4, and coil inductance is 85～110 μ H.In order to satisfy the needs that the warm-pressing technology system adds hot aggregate bin, duff pipe, piston shoes, base plate, mould, be circle or polygon with the shaped design of ferromagnetic metal sleeve pipe 5, duff pipe is that circle, base plate, feed bin and piston shoes are polygon; Be heated powder 6 homogeneous heating in order to make, programming rate is fast, and the inner chamber of ferromagnetic metal sleeve pipe 5 is designed to one or more cavitys.Fig. 2, Fig. 3, Fig. 4, Fig. 5 are respectively different ferromagnetic metal sleeve pipe cross sectional representation.
Working method:
The electric current that a, electromagnetic induction heating driver 3 produce characteristic frequency is by solenoid 7, and magnetic field that solenoid 7 produces and ferromagnetic metal sleeve pipe 5 form magnetic loop, and produces eddy current on ferromagnetic metal sleeve pipe 5 surfaces;
Thereby b, frequency converter 1 change the distribution that the electromagnetic induction frequency changes vortex field in the ferromagnetic metal sleeve pipe 5;
C, this eddy current convert heat energy under the resistance effect of ferromagnetic metal sleeve pipe 5, make 5 heating of ferromagnetic metal sleeve pipe;
D, the powder 6 that is heated that will flow by heat conduction heat.
Electromagnetic induction heating driver 3 can be on the basis of existing HGP-16 high-frequency induction heating drive circuit, adopt electric power semiconductor element IGBT pipe, the electric current of input coil 7 is for handing over electric current frequently, frequency is 20Hz～35 kHz, coil inductance is 85～110 μ H, power output is adjustable at 600～1500W, to adapt to the requirement of the different objects of temperature and pressure heating system.
Along with the flow velocity difference that is heated powder 6, temperature can fluctuate thereupon, at this moment ferromagnetic metal sleeve pipe 5 temperature inside fields change, can change the intensity that is heated vortex field in the ferromagnet by changing the electromagnetic induction frequency, when improving induction frequencies, ferromagnetic metal sleeve pipe 5 outer wall vortex field intensity increase, and core vortex field intensity reduces, at this moment the internal and external temperature field gradient becomes big, can improve the efficiency of heating surface; When reducing induction frequencies, ferromagnetic metal sleeve pipe 5 outer wall vortex field intensity diminish, and core vortex field density improves, and at this moment the internal and external temperature field gradient slows down, thereby improve temperature control precision.
Temperature sensor I and temperature sensor II are respectively applied for the outer wall of detection ferromagnetic metal sleeve pipe 5 and the temperature of core, measure two locational temperature difference Δ T by intelligent temperature adjusting apparatus 2, Δ T signal is changed into the voltage signal U that can regulate the frequency changer circuit output frequency, frequency converter 1 is that the control signal of f is passed to electromagnetic induction heating driver 3 with frequency then, is that the electric current of f is transported to induction coil 7 by it with frequency.Temperature difference T becomes big in the temperature control process, and frequency changer circuit can reduce frequency f automatically, to reach the setting temperature difference.Practice shows that when Δ T was controlled at 4～6 ℃, the efficiency of heating surface and accuracy of temperature control reached optimum state.Directly control electromagnetic induction heating driver 3 and coil 7 by intelligent temperature adjusting apparatus 2 by the PID mode, control precision can reach ± and 1.5 ℃.
Claims (7)
1. powder metallurgy warm-pressing electromagnetic-induction heating method is characterized in that:
Flow through solenoid (7) with the alternating current that produces in the electromagnetic induction heating driver (3) and go up the generation electromagnetic induction heat at ferromagnetic metal sleeve pipe (5);
Be heated powder and flow through in metal sleeve (5), the electromagnetic induction heat that absorbs on the metal sleeve (5) is heated up.
2. powder metallurgy warm-pressing electromagnetic-induction heating method according to claim 1 is characterized in that the described AC current frequency that flows through solenoid (7) is 20Hz～300KHz.
3. powder metallurgy warm-pressing electromagnetic-induction heating method according to claim 1 is characterized in that the described alternating current that flows through solenoid (7) is the frequency conversion electric current, and its frequency is 20Hz～300KHz.
4. powder metallurgy warm-pressing electromagnetic induction heater is characterized in that:
Control circuit is set, described control circuit comprises temperature sensor I (8) and the temperature sensor II (9) on frequency converter (1), intelligent temperature adjusting apparatus (2), electromagnetic induction heating driver (3), the different detection position, and the solenoid (7) in the output loop that is arranged on electromagnetic induction heating driver (3) of connecting;
Ferromagnetic metal sleeve pipe (5) is set, being heated powder (6) is in the inner chamber of ferromagnetic metal sleeve pipe (5), periphery at described ferromagnetic metal sleeve pipe (5) is provided with heat-insulation layer (4), and solenoid (7) is wound on the ferromagnetic metal sleeve pipe (5), and is positioned at the appearance of heat-insulation layer (4).
5. powder metallurgy warm-pressing electromagnetic induction heater according to claim 4 is characterized in that described temperature sensor I (8) and temperature sensor II (9) divide to be in axial locations different in the ferromagnetic metal sleeve pipe (5) and the different radial position.
6. powder metallurgy warm-pressing electromagnetic induction heater according to claim 4, the periphery that it is characterized in that described ferromagnetic metal sleeve pipe (5) is circle or polygon.
7. powder metallurgy warm-pressing electromagnetic induction heater according to claim 4, the inner chamber that it is characterized in that described ferromagnetic metal sleeve pipe (5) is one or more cavitys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100257114A CN101106844A (en) | 2007-07-27 | 2007-07-27 | Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100257114A CN101106844A (en) | 2007-07-27 | 2007-07-27 | Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101106844A true CN101106844A (en) | 2008-01-16 |
Family
ID=39000458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100257114A Pending CN101106844A (en) | 2007-07-27 | 2007-07-27 | Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101106844A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105208698A (en) * | 2015-10-14 | 2015-12-30 | 珠海格力电器股份有限公司 | Magnetic assembly capable of adjusting vortex field uniformity and electromagnetic oven |
| CN107228573A (en) * | 2017-06-15 | 2017-10-03 | 佛山市高捷工业炉有限公司 | A kind of industrial smelting furnace stirring means and its terminal |
-
2007
- 2007-07-27 CN CNA2007100257114A patent/CN101106844A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105208698A (en) * | 2015-10-14 | 2015-12-30 | 珠海格力电器股份有限公司 | Magnetic assembly capable of adjusting vortex field uniformity and electromagnetic oven |
| CN105208698B (en) * | 2015-10-14 | 2018-10-16 | 珠海格力电器股份有限公司 | A kind of magnet assembly and electromagnetic oven of adjustment vortex field uniformity |
| CN107228573A (en) * | 2017-06-15 | 2017-10-03 | 佛山市高捷工业炉有限公司 | A kind of industrial smelting furnace stirring means and its terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104526948A (en) | Thermal-mechanical-magnetic multi-field coupling mold pressing forming machine | |
| CN204209948U (en) | The plastic extruder of high-frequency electromagnetic heating | |
| CN101106844A (en) | Electromagnetic induction heating method and its heating device for powder metallurgy warm compaction | |
| CN204634076U (en) | A kind of electromagnetic heater | |
| CN201114791Y (en) | Electromagnetic inductance heating device for powder metallurgy temperature voltage | |
| CN101942692A (en) | High temperature microwave silicon material smelting furnace | |
| CN202979345U (en) | High-frequency electromagnetic heating device | |
| CN201708973U (en) | Plastic mechanical energy-saving device | |
| CN201141655Y (en) | Electromagnetic heating type water heater | |
| CN202470747U (en) | Inductive coupling heating and sintering device | |
| CN201793805U (en) | High-temperature microwave silicon material smelting furnace | |
| CN203691667U (en) | Novel box type electromagnetic induction heating furnace | |
| CN203675355U (en) | Electro-magnetic-induction energy-gathered heating device | |
| CN101504165A (en) | Hyperacoustic frequency electric heater | |
| CN203148198U (en) | Intermediate frequency heating furnace | |
| CN203219528U (en) | Novel electromagnetic inducing heating device | |
| CN202615939U (en) | A control device for preheating an outer mould of a cable extruder | |
| CN2590687Y (en) | Mould induction heating furnace for aluminium section bar extrusion production line | |
| CN202947298U (en) | Heating structure of fluid high-frequency heater | |
| CN201885548U (en) | Intelligent variable-frequency electromagnetic induction sintering furnace | |
| CN201579963U (en) | Injection machine electromagnetic heating system | |
| CN204535383U (en) | A kind of high-frequency electromagnetic induction heated crucible | |
| CN203200328U (en) | Sponge titanium distillation passage heating device | |
| CN201499339U (en) | Magnet yoke type electromagnetic heating device for tube or rod component | |
| CN206974156U (en) | A kind of intermediate frequency vacuum sintering funace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080116 |