CN102534137A - Far-infrared local heating correction half-gear-ring heat treatment opening deformation method - Google Patents
Far-infrared local heating correction half-gear-ring heat treatment opening deformation method Download PDFInfo
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- CN102534137A CN102534137A CN2011104548558A CN201110454855A CN102534137A CN 102534137 A CN102534137 A CN 102534137A CN 2011104548558 A CN2011104548558 A CN 2011104548558A CN 201110454855 A CN201110454855 A CN 201110454855A CN 102534137 A CN102534137 A CN 102534137A
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Abstract
The invention discloses a far-infrared local heating correction half-gear-ring heat treatment opening deformation method which comprises the following steps: horizontally lifting the half gear ring, of which the opening exceeds the requirement and needs necking correction, away from the ground with a cushion block; respectively fixing heating pads of far-infrared heating equipment to the outer circle bow top and inner radial plate of the half gear ring, and wrapping the heating pads and the section of the gear ring with a heat insulating material; sequentially applying heating control at different heating temperatures on the outer circle bow top and the inner radial plate, cooling, and correcting the opening the half gear ring to the required dimension. The invention can accurately correct the opening half gear ring, and lowers the aberration resistance for correcting the half gear ring, thereby greatly lowering the power required by correction. The invention is simple to operate, and is safe and reliable. In the correction process, the parts do not have to be combined into a complete circle, but can be a semicircular state.
Description
Technical field
The invention belongs to metallic substance heat treatment technics field, especially relate to a kind of far infrared local heating and proofread and correct the method that half-ring gear thermal treatment dehisces to be out of shape.
Background technology
The half-ring gear that the thermal treatment of half-ring gear typically refers to iron and steel material quality is heated to A
C3Or A
C1A certain temperature more than the point keeps certain hour, obtains the thermal treatment process of intended tissue and performance then with suitable speed cooling.Since the ununiformity of the temperature in half-ring gear cross section and tissue variation during heating and cooling, and bear gravity and frock holding force etc., under the effect of internal stress and external force, more or less, all producing distortion after the half-ring gear thermal treatment, the situation of dehiscing is particularly common.
The transmission mechanism of kiln mill kind equipment all can relate to bull gear usually; Because of making and the reason of installation aspect, gear ring basically all is to be combined by two half-ring gears, and mostly the diameter of this type gear ring is that 4 meters are not waited to 10 meters at present; 12 meters diameter is unrare yet; Its manufacturing process flow is generally: cast blank, and------roughing---thermal treatment---precision work is combined into circular processing with two blanks during roughing, is divided into two semicircle parts during thermal treatment again and goes into stove in annealing.Consider the Special Circumstances of this type part, before getting into heat treatment step, all leave enough process redundancy usually, to guarantee having distortion also can process qualified gear ring after the thermal treatment.But, owing to the existence of some unexpected factors, still have a spot of half-ring gear amount of dehiscing to surpass process redundancy in the actual production.This type gear ring size is big, and casting technique is complicated, if scrap during to heat treatment step, will cause enormous economic loss, so be necessary it is proofreaied and correct.
At present, ordinary method adopts the way of screw block and wireline fixed measure post-heating to carry out for the distortion correction of half-ring gear more, and process is complicated and have a lot of unsafe factors.
Summary of the invention
For addressing the above problem, the purpose of this invention is to provide a kind of simple to operate, safe and reliable far infrared local heating and proofread and correct the method that half-ring gear thermal treatment dehisces to be out of shape.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of far infrared local heating is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape, and it may further comprise the steps:
(1), will dehisce to surpass and need require the gauged half-ring gear of reducing overhead with the pad of cushion block level;
(2), with the heating cushion of far-infrared heating equipment be separately fixed at half-ring gear outer circular top and in the disc place, again heating cushion and this section gear ring are wrapped with lagging material; Externally circular top and interior disc have the thermal control that adds that imposes different heating temperature successively, the processing of lowering the temperature again, and the opening size of the half-ring gear that will dehisce is corrected to the size that needs.
In the method that above-mentioned far infrared local heating correction half-ring gear thermal treatment dehisces to be out of shape; Disc fixed heating cushion length is not less than outer circular top fixed heating cushion length in the said half-ring gear; The Heating temperature on the outer circular of half-ring gear top is not more than the heat treated tempering temperature of half-ring gear, and the Heating temperature of the interior disc of half-ring gear is 1.15～1.3 times of cylindrical temperature.
In the method that above-mentioned far infrared local heating correction half-ring gear thermal treatment dehisces to be out of shape; Said external circular top and interior disc heating sequence are internally disc heating earlier; External circular backs down the beginning heating after reaching interior disc Heating temperature; In good time reduction cylindrical temperature was lowered the temperature in interior disc power failure after outer circular top reached Heating temperature.
In the method that above-mentioned far infrared local heating correction half-ring gear thermal treatment dehisces to be out of shape; It is L that the setting half-ring gear is proofreaied and correct final outside dimension; The overall dimension of dehiscing in the heat-processed is L1; The minimum size of dehiscing is L2, in interior disc power failure temperature-fall period, from (L-L2)/(L1-L2) value be 50% o'clock pairing time began to reduce outside circular top temperature.
Because adopt aforesaid technical scheme, the present invention has following meliority:
This far infrared local heating is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape; It is through replacing heating and cooling to half-ring gear cylindrical Gong Ding and interior disc; Thermal stresses makes gear ring produce viscous deformation, and the control half-ring gear is proofreaied and correct rebound degree, comparatively accurately the half-ring gear of dehiscing is proofreaied and correct with realization; Outer circular top Heating temperature adopts the temperature below the final tempering temperature, can guarantee that the mechanical property of half-ring gear is satisfied the demand, and guarantees to dehisce size through the Heating temperature of adjusting interior disc; Carry out timing, only need to measure half-ring gear diameter place size, thereby regulating and controlling temperature is reaching gauged purpose; Reduced the distortion drag of required gauged half-ring gear, made and proofread and correct required power and reduce greatly, simple to operate, safe and reliable, and the timing part need not be combined into whole circle, can be the semicircle shape attitude.
Description of drawings
Fig. 1 be method of the present invention to half-ring gear the dehisce vertical view of timing of thermal treatment;
Among the figure: the outer circular of 1-top; Disc in the 2-; The 3-lagging material.
Embodiment
Through accompanying drawing and embodiment technical scheme of the present invention is done further explain below.
As shown in Figure 1, a material is the half-ring gear of ZG42CrMo, and drawing requirement is of a size of φ 7599mm (L), dehisces behind the heat treatment deformation to 7680 mm.
In order to proofread and correct to the drawing requirement size, adopt far infrared local heating of the present invention to proofread and correct the method that half-ring gear thermal treatment dehisces to be out of shape, its concrete steps are:
(1), will dehisce to surpass and need require the gauged half-ring gear of reducing overhead with the pad of cushion block level;
(2), the heating cushion of far-infrared heating equipment is separately fixed at the outer circular top 1 and interior disc 2 places of half-ring gear; Again heating cushion and this section gear ring are wrapped with lagging material 3; Wherein, outer circular top fixed heating cushion length is 2m, and interior disc fixed heating cushion length is 2.3m; Begin heating, interior disc is warming up to 620 ℃ earlier, and half-ring gear begins to dehisce; Dehisce to overall dimension 7780mm (L1), reach after the Heating temperature externally that circular backs down the beginning heating, half-ring gear fades to reducing by dehiscing; Be heated to 539 ℃ of outer circular top Heating temperatures, disc temperature in reducing then, half-ring gear is reducing significantly; When (L2), begin to reduce outer circular top temperature, correction of a final proof to drawing requirement size to the half-ring gear reducing to 7418mm.
[0003]Key in summary of the invention herein and describe paragraph.
Claims (4)
1. a far infrared local heating is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape, and it is characterized in that: it may further comprise the steps:
(1), will dehisce to surpass and need require the gauged half-ring gear of reducing overhead with the pad of cushion block level;
(2), with the heating cushion of far-infrared heating equipment be separately fixed at half-ring gear outer circular top and in the disc place, again heating cushion and this section gear ring are wrapped with lagging material; Externally circular top and interior disc have the thermal control that adds that imposes different heating temperature successively, the processing of lowering the temperature again, and the opening size of the half-ring gear that will dehisce is corrected to the size that needs.
2. far infrared local heating according to claim 1 is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape; It is characterized in that: disc fixed heating cushion length is not less than outer circular top fixed heating cushion length in its half-ring gear; The Heating temperature on the outer circular of half-ring gear top is not more than the heat treated tempering temperature of half-ring gear, and the Heating temperature of the interior disc of half-ring gear is 1.15～1.3 times of cylindrical temperature.
3. far infrared local heating according to claim 1 is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape; It is characterized in that: its external circular top and interior disc heating sequence are internally disc heating earlier; External circular backs down the beginning heating after reaching interior disc Heating temperature; In good time reduction cylindrical temperature was lowered the temperature in interior disc power failure after outer circular top reached Heating temperature.
4. far infrared local heating according to claim 1 is proofreaied and correct the method that half-ring gear thermal treatment dehisces to be out of shape; It is characterized in that: it is L that the setting half-ring gear is proofreaied and correct final outside dimension; The overall dimension of dehiscing in the heat-processed is L1; The minimum size of dehiscing is L2, in interior disc power failure temperature-fall period, from (L-L2)/(L1-L2) value be 50% o'clock pairing time began to reduce outside circular top temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110454855.8A CN102534137B (en) | 2011-12-30 | 2011-12-30 | Method for Far-infrared local heating correction for half-gear-ring opening deformation by heat treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110454855.8A CN102534137B (en) | 2011-12-30 | 2011-12-30 | Method for Far-infrared local heating correction for half-gear-ring opening deformation by heat treatment method |
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| CN102534137A true CN102534137A (en) | 2012-07-04 |
| CN102534137B CN102534137B (en) | 2014-01-01 |
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| CN201110454855.8A Expired - Fee Related CN102534137B (en) | 2011-12-30 | 2011-12-30 | Method for Far-infrared local heating correction for half-gear-ring opening deformation by heat treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929658A (en) * | 2016-12-14 | 2017-07-07 | 常州天山重工机械有限公司 | A kind of tempering correction process of the quenched ring gear of thin-walled |
| WO2021120391A1 (en) * | 2019-12-16 | 2021-06-24 | 南京金鑫传动设备有限公司 | Method for deformation correction after heat treatment of thin-wall gear ring part |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6228038A (en) * | 1985-07-30 | 1987-02-06 | Isuzu Motors Ltd | Precise working method for inner spline gear |
| CN101020204A (en) * | 2007-03-15 | 2007-08-22 | 上海交通大学 | Far infrared local heating process for correcting deformation of semi-annulus caused by heat treatment |
| JP2009197312A (en) * | 2008-02-25 | 2009-09-03 | Nsk Ltd | Method for correcting deformation of annular member |
| CN101838730A (en) * | 2010-03-23 | 2010-09-22 | 中信重工机械股份有限公司 | Reversible deformation correcting method for elliptical gear ring subjected to deformation after carburization |
| CN102102140A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | Large arc casting calibrating method |
-
2011
- 2011-12-30 CN CN201110454855.8A patent/CN102534137B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6228038A (en) * | 1985-07-30 | 1987-02-06 | Isuzu Motors Ltd | Precise working method for inner spline gear |
| CN101020204A (en) * | 2007-03-15 | 2007-08-22 | 上海交通大学 | Far infrared local heating process for correcting deformation of semi-annulus caused by heat treatment |
| JP2009197312A (en) * | 2008-02-25 | 2009-09-03 | Nsk Ltd | Method for correcting deformation of annular member |
| CN101838730A (en) * | 2010-03-23 | 2010-09-22 | 中信重工机械股份有限公司 | Reversible deformation correcting method for elliptical gear ring subjected to deformation after carburization |
| CN102102140A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | Large arc casting calibrating method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929658A (en) * | 2016-12-14 | 2017-07-07 | 常州天山重工机械有限公司 | A kind of tempering correction process of the quenched ring gear of thin-walled |
| WO2021120391A1 (en) * | 2019-12-16 | 2021-06-24 | 南京金鑫传动设备有限公司 | Method for deformation correction after heat treatment of thin-wall gear ring part |
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| CN102534137B (en) | 2014-01-01 |
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