CN102497688B - Induction heating technique for double-sided roll forming of discal parts - Google Patents
Induction heating technique for double-sided roll forming of discal parts Download PDFInfo
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- CN102497688B CN102497688B CN201110399183.5A CN201110399183A CN102497688B CN 102497688 B CN102497688 B CN 102497688B CN 201110399183 A CN201110399183 A CN 201110399183A CN 102497688 B CN102497688 B CN 102497688B
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Abstract
The invention provides a discal-part induction heating technique used in the double-sided roll forming of discal parts. The technique is implemented by using a conventional induction heating power supply, a temperature controller, a water-cooling machine and a specially-designed induction coil and a method for controlling a heating process. Compared with the conventional batch-type furnace heating mode, the technique has the characteristics of short deformation-free heating time, capability of avoiding the growth of crystal grains of materials for discal parts, low heat loss and convenience in operation. In addition, because a rolling head is not arranged in the induction coil, the temperature of the rolling head is far lower than the temperature of a deformed discal part, thereby lowering the requirement on the high-temperature strength of materials of the rolling head, and reducing the material and processing cost of the rolling head, so that the isothermal roll forming of some high temperature alloy discal parts which are difficult to deform becomes feasible.
Description
Technical field
The present invention relates to the heating technique of the dish-type part in a kind of dish-type part two-sided roll milling forming.
Background technology
Existing dish-type part two-sided roll milling forming is used box type furnace to heat dish-type part to be formed, as shown in Figure 1.In this mode of heating, the rotating spindle of ram and diskware all heats with dish-type part in stove simultaneously.Although this mode of heating can be realized isothermal roll milling forming, a lot of heats all outside stove and carry out water-cooled, can be taken away in 4 rams and main shaft two ends, have not only wasted the energy but also strengthened the difficulty of water-cooled design; On the other hand, ram and diskware are in same heating furnace, to make it to occur plastic deformation by ram spreading diskware, necessarily require the elevated temperature strength of ram material high more a lot of than the elevated temperature strength of diskware material, like this when the difficult wrought superalloy of diskware material, just be difficult to find suitable ram material, therefore use existing mode of heating to be difficult to realize the roll milling forming of difficult-to-deformation material high temperature alloy dish-type part.The 3rd, for large-scale dish base, box type furnace is longer heating time, to some material, may cause grain growth.
Summary of the invention
The present invention is a kind of dish-type part induction heating technique for dish-type part two-sided roll milling forming.
The included hardware device of induction heating technique that the present invention adopts is: the special-purpose induction coil of induction heating power, heating diskware, for the temperature controller of programming rate and preservation and controlling, for power supply and the cooling water cooling unit of induction coil.The power frequency of induction heating can be high frequency, intermediate frequency or low frequency, and this depends primarily on shaping diskware blank resistivity and thickness.The frequency range of choosing is approximately: (10
6* resistivity ÷ thickness
2) 3 times to 6 times between, wherein resistivity unit is Ω/m, thickness unit is m, cps is HZ..For example thickness is less than the dish base of 40mm, by high-frequency induction heating, when coiling base thickness at 40-100mm, will adopt Frequency Induction Heating, and thicker blank need to be used line-frequency induction heating.Induction heating power power is relevant with diskware size with material category, and evaluation method is: (billet weight * heating-up temperature * specific heat) ÷ gross efficiency, and the high temperature efficiency of steel is at 0.6-0.8, and the efficiency of aluminium alloy heating is 0.5 left and right.The technical parameter of water cooling unit is determined by power and efficiency.If induction coil, frequency converter and electric capacity heat-dissipating equal 50%, 7.5% and 1.5% of gross power, the intake-outlet temperature difference is 20 ℃, specific heat of water=4.2kj/kg/ ℃, coefficient of safety=1.15, require cooling water flow to be about w=0.03 * power supply gross power, here power unit is KW, and flux unit is m
3/ hour.The temperature difference that improves turnover saliva can reduce discharge.In order to keep diskware constant temperature in spreading process, need to use temperature controller, it comprises carries out the infrared radiation thermometer of non-cpntact measurement and the adjuster that carries out temperature closed loop control to diskware temperature.With reference to existing theories of induction heating and empirical equation, according to dish-type part material property and diskware physical dimension, carry out the specialized designs of dish-type part heat induced circle.Induction coil is divided into upper and lower two parts, and symmetry is placed on the upper and lower both sides of diskware, and separated by a distance, and heated diskware is enclosed within induction coil.Ram lies in a horizontal plane between upper and lower two induction coils, at induction coil, realizes roll milling forming outward in the face of diskware loads.For reduce the impact of induction coil magnetic field on ram as far as possible, make the not sensed heating of ram, also, in order to make induction coil not affect ram motion, the distance of upper and lower two parts induction coil should be slightly larger than the diameter of ram, as shown in Figure 2.Although there is not sensed circle in region to cover between upper and lower induction coil, but because diskware is moving in not stall in spreading process, the particle of diskware be induction heating and plastic deformation do not stop alternately, therefore the rotating speed by reasonable control diskware can guarantee diskware deformed area in etc. gentle samming state.In roll milling forming process, ram is all the time in induction coil outside, and induction heating impact is very little, only have with workpiece transmission of heat by contact and make its local temperature increase, so the temperature of ram is far below the temperature of diskware.This has just reduced the requirement to ram material at high temperature intensity.
The operating procedure of implementing dish-type part roll milling forming with induction heating method is as follows: 1) mounting disc base and upper and lower induction coil; 2) ram contact diskware, apply certain pressure after starter motor by ram, drive cold dish base to rotate; 3) set heating-up temperature, open induction heating power, start the dish base of rotation to carry out induction heating; 3) in order to guarantee that spreading distortion is in Isothermal Condition, before formally carrying out spreading distortion, leave certain heating-up time and temperature retention time, they are relevant with the heating-up temperature of dish base material and setting, and general surface temperature reaches set temperature needs 5-10 minute.The object of insulation is to overcome the skin effect of induction heating, by heat, is conducted and is made the temperature of thickness direction even, and the temperature retention time of the thicker needs of plate is longer.For most of diskware materials and be not more than the diskware that 100mm is thick, before roll milling forming, the needed heating and thermal insulation time is 6-15 minute.In whole spreading process, by temperature controller, make plate keep constant temperature.After spreading completes, power-off stops heating, takes out diskware.Because intensification and the temperature retention time of diskware before spreading distortion are very short, for most of materials, this induction heating mode can not cause remarkable grain growth.
accompanying drawing explanationbelow in conjunction with accompanying drawing, the present invention will be further described in detail
The scheme of installation of Fig. 1 dish-type part two-sided roll milling box type furnace heating diskware, ram, main shaft.
Induction coil shape and scheme of installation for Fig. 2 dish-type part two-sided roll milling induction heating, ram is placed between two induction coils.
The induction coil of Fig. 3 practicality.
embodimenthere provide one for the heating system of the two-sided grinding forming of small-sized dish-type part (diameter is less than 200mm, and thickness is less than 30mm).This system comprises 40KW high-frequency induction heating power, the air-cooled water cooling machine of 4, and 1 inch of water pipe diameter, with the temperature controller of non-contact infrared temperature sensor.The induction coil of a heating diskware, as shown in Figure 3, wherein induction coil is that square, size is greater than diskware to its geomery.Upper and lower two induction coils distance is adjustable within the scope of 65-80mm.Induction coil coil spacing is 8mm, and copper pipe is square-section, is of a size of 12 * 10mm, and wall thickness is 1-2mm.For diameter 200mm, the heating of the titanium alloy dish base that 20mm is thick, the forming temperature of setting is 927 ℃, after heating and thermal insulation 6-15 minute, ram can start loading and carry out roll milling forming.In spreading process, temperature controller guarantees that diskware, in constant temperature process, unloads diskware until spreading completes.
Claims (1)
1. for a dish-type part induction heating technology for dish-type part two-sided roll milling forming, it is characterized in that: in two-sided roll milling forming process, heat dish-type part, the heating of diskware, distortion and rotational synchronization are carried out; According to dish-type part material property and physical dimension, be that dish-type part designs special induction coil, induction coil is divided into upper and lower two parts, and heated diskware is enclosed within induction coil, and ram is placed between two induction coils; Designed induction coil will guarantee ram working space and diskware deformation space, guarantees that the induction heating temperature rise of ram does not cause its plastic deformation, coordinates rotating speed and guarantees that diskware is out of shape under predetermined state of temperature; According to the heating-up temperature of diskware material and setting, determine the suitable heating and thermal insulation time, be less than the diskware of 100mm for thickness, before roll milling forming, the needed heating and thermal insulation time is 6-15 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399183.5A CN102497688B (en) | 2011-12-05 | 2011-12-05 | Induction heating technique for double-sided roll forming of discal parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399183.5A CN102497688B (en) | 2011-12-05 | 2011-12-05 | Induction heating technique for double-sided roll forming of discal parts |
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| Publication Number | Publication Date |
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| CN102497688A CN102497688A (en) | 2012-06-13 |
| CN102497688B true CN102497688B (en) | 2014-01-29 |
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| CN201110399183.5A Expired - Fee Related CN102497688B (en) | 2011-12-05 | 2011-12-05 | Induction heating technique for double-sided roll forming of discal parts |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103586378B (en) * | 2013-11-08 | 2016-03-09 | 机械科学研究总院先进制造技术研究中心 | High temperature alloy dual-property dish forming process of roll milling |
| CN109940119B (en) * | 2019-04-08 | 2021-08-03 | 上海交通大学 | Thermal forming process and die for crossed ribs on inner surface and outer surface of thin-wall cylindrical part |
| CN112275977A (en) * | 2020-10-16 | 2021-01-29 | 北京机电研究所有限公司 | Disc rolling forming system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101185952A (en) * | 2007-11-05 | 2008-05-28 | 机械科学研究总院先进制造技术研究中心 | Two-sided roll milling forming method and two-sided roll milling forming equipment |
| CN101306430A (en) * | 2008-06-19 | 2008-11-19 | 安徽工业大学 | Light thin wall H shaped steel concurrent heating and rolling method |
| CN101417379A (en) * | 2007-10-27 | 2009-04-29 | 襄阳汽车轴承股份有限公司 | Tapered roller bearing ring double extension-sleeve forging technique |
| CN101617562A (en) * | 2007-02-16 | 2009-12-30 | 新日本制铁株式会社 | Induction heating equipment |
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2011
- 2011-12-05 CN CN201110399183.5A patent/CN102497688B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101617562A (en) * | 2007-02-16 | 2009-12-30 | 新日本制铁株式会社 | Induction heating equipment |
| CN101417379A (en) * | 2007-10-27 | 2009-04-29 | 襄阳汽车轴承股份有限公司 | Tapered roller bearing ring double extension-sleeve forging technique |
| CN101185952A (en) * | 2007-11-05 | 2008-05-28 | 机械科学研究总院先进制造技术研究中心 | Two-sided roll milling forming method and two-sided roll milling forming equipment |
| CN101306430A (en) * | 2008-06-19 | 2008-11-19 | 安徽工业大学 | Light thin wall H shaped steel concurrent heating and rolling method |
Non-Patent Citations (1)
| Title |
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| 胡亚民等.4.10 电加热.《摆动辗压工艺及模具设计》.重庆大学出版社,2001,118-119. * |
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