CN103639248A - Correction method of elliptical deformation of large ring parts after heat treatment - Google Patents
Correction method of elliptical deformation of large ring parts after heat treatment Download PDFInfo
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- CN103639248A CN103639248A CN201310524843.7A CN201310524843A CN103639248A CN 103639248 A CN103639248 A CN 103639248A CN 201310524843 A CN201310524843 A CN 201310524843A CN 103639248 A CN103639248 A CN 103639248A
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Abstract
The invention provides a correction method of elliptical deformation of large ring parts after heat treatment, and relates to the technical field of metal material heat treatment. The method includes the steps that the direction of a short axis B is indicated after the elliptical deformation amount of the ring parts is measured, the ring parts are placed into a trolley furnace for heating and thermal insulation, then the ring parts are taken out, two supporting rods are vertically fixed to the middles of the inner circles of the ring parts, after secondary heating and thermal insulation, the ring parts which are taken out are cooled, and the supporting rods are removed so as to obtain the ring parts meeting actual requirements. According to the method, due to the fact that the strength of the deformed parts under the high-temperature condition is low, correction is performed through the swelling amount of the two supporting rods under the heating condition, and the correction method is simple to operate, capable of saving energy, safe and reliable.
Description
[technical field]
The invention belongs to metal material heat treatment technics field, especially relate to a kind of bearing calibration of measuring ovalizing deflection after large-scale ring parts heat treatment.
[background technology]
Known, wheel band, the large-scale ring parts such as rolling ring is the vital part on kiln large-scale mill series products, this ring parts external diameter is larger, wall thickness is also thicker, when heat treatment, conventionally adopt car type furnace heating, very easily there is ovalizing deflection in ring parts in heat treated process, once there is distortion and will bring very large difficulty to the machining in later stage in ring parts, operator is conventionally in order to process the product of drawing requirement, just have in making the process of blank, the thickness surplus of blank is amplified, make it be greater than deflection, so not only cause the serious waste of material, more crucial is, the heat treatment ovalizing deflection of part can cause each processing capacity of follow-up inside and outside circle different, thereby affect the uniformity of part outer working face hardness, the final serviceability that affects product, once and the ovalizing deflection of heat treatment process is greater than institute's made allowance, will causes again product to carry out machining and scrap, and find out the basic demand that the bearing calibration of ovalizing deflection after a kind of large-scale ring parts heat treatment becomes those skilled in the art.
[summary of the invention]
In order to overcome the deficiency in background technology, the invention discloses the bearing calibration of ovalizing deflection after a kind of large-scale ring parts heat treatment, described method indicates the direction of minor axis B after the ovalizing deflection amount of measuring ring parts, put into car type furnace heating and thermal insulation, then take out the middle part that two struts is vertically fixed on to ring-shaped work pieces inner circle, again after heating and thermal insulation, the ring-shaped work pieces taking out is carried out coolingly, remove strut, to obtain the ring parts of realistic requirement; The present invention utilizes that under the condition of high temperature, to be out of shape the intensity of part lower, by the swell increment under the heated condition of two struts, proofreaies and correct, simple to operate, save the energy, and safe and reliable.
In order to realize the object of foregoing invention, the present invention adopts following technical scheme:
The bearing calibration of ovalizing deflection after a kind of large-scale ring parts heat treatment, described method comprises the ovalizing deflection amount, heating and thermal insulation, placement strut of ring parts of measuring, heating and thermal insulation, cooling and to the cooling ring parts that obtains realistic requirement of strut again, and concrete operation step is as follows:
1) measure the ovalizing deflection amount of ring parts:
First measure the ovalizing deflection amount of ring parts, measure inner circle long axis length A and inner circle minor axis length B;
2) heating and thermal insulation:
Connect previous step, the ring parts pad of measuring deflection, on car type furnace, is made a mark in the direction of the minor axis B of ring parts periphery, take out after the ring parts marking is put into car type furnace heating and thermal insulation;
3) place strut 2:
Connect previous step, the strut that is (A+B)/2 by two length is vertically placed on the middle part of the ring parts inner circle after heating and thermal insulation mutually, and horizontal pad is firm, and wherein the two ends of the arbitrary strut in two struts are consistent with the direction of minor axis B;
4) heating and thermal insulation again:
Connect previous step, take out after the good ring parts with two struts of pad is put into car type furnace heating and thermal insulation;
5) cooling
Connect previous step, the ring parts with two struts after coming out of the stove carried out to air cooling, air cooling to the surface temperature of ring parts lower than 300 degree after, ring parts is hung to car type furnace;
6) cooling to strut
Connect previous step, ring parts is hung and two struts carried out after car type furnace coolingly, make two struts depart from ring parts, to obtain the ring parts of realistic requirement.
The bearing calibration of ovalizing deflection after described large-scale ring parts heat treatment, the material making marks in described step 2 is adeciduate marker at high temperature, and described marker is lead oil.
The bearing calibration of ovalizing deflection after described large-scale ring parts heat treatment, the heating-up temperature in described step 2 and step 4 is 580 degree-620 degree, and temperature retention time is 6-8.5 hour.
The bearing calibration of ovalizing deflection after described large-scale ring parts heat treatment is water cooling to the type of cooling of two struts in described step 6.
Owing to adopting technique scheme, the present invention has following beneficial effect:
The bearing calibration of ovalizing deflection after large-scale ring parts heat treatment of the present invention, described method indicates the direction of minor axis B after the ovalizing deflection amount of measuring ring parts, put into car type furnace heating and thermal insulation, then take out the middle part that two struts is vertically fixed on to ring-shaped work pieces inner circle, again after heating and thermal insulation, to the ring-shaped work pieces taking out, carry out cooling, remove strut, to obtain the ring parts of realistic requirement; The present invention utilizes that under the condition of high temperature, to be out of shape the intensity of part lower, by the swell increment under the heated condition of two struts, proofreaies and correct, simple to operate, save the energy, and safe and reliable.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram before the present invention proofreaies and correct;
Fig. 2 is the schematic diagram after the present invention heats;
Fig. 3 is the schematic diagram of timing of the present invention;
Fig. 4 is the schematic diagram after the present invention proofreaies and correct;
In the drawings: 1, ring parts; 2, strut.
[specific embodiment]
With reference to the following examples, can explain in more detail the present invention; But the present invention is not limited to these embodiment.
The bearing calibration of ovalizing deflection after a kind of large-scale ring parts heat treatment described in 1-4 by reference to the accompanying drawings, described method comprises the ovalizing deflection amount, heating and thermal insulation, placement strut 2 of ring parts 1 of measuring, heating and thermal insulation, cooling and to the cooling ring parts that obtains realistic requirement of strut 2 again, and concrete operation step is as follows:
1) measure the ovalizing deflection amount of ring parts:
First measure the ovalizing deflection amount of ring parts 1, measure inner circle long axis length A and inner circle minor axis length B;
2) heating and thermal insulation:
Connect previous step, ring parts 1 pad of measuring deflection, on car type furnace, is made a mark in the direction of the minor axis B of ring parts 1 periphery, the material making marks is lead oil; After being put into car type furnace heating and thermal insulation, takes out the ring parts marking 1; Heating-up temperature is 580 degree-620 degree, and temperature retention time is 6-8.5 hour;
3) place strut:
Connect previous step, the strut that is (A+B)/2 by two length 2 is vertically placed on the middle part of ring parts 1 inner circle after heating and thermal insulation mutually, and horizontal pad is firm, and wherein the two ends of the arbitrary strut 2 in two struts 2 are consistent with the direction of minor axis B;
4) heating and thermal insulation again:
Connect previous step, take out after the good ring parts 1 with two struts 2 of pad is put into car type furnace heating and thermal insulation; Heating-up temperature is 580 degree-620 degree, and temperature retention time is 6-8.5 hour;
5) cooling
Connect previous step, the ring parts 1 with two struts 2 after coming out of the stove carried out to air cooling, air cooling to the surface temperature of ring parts 1 lower than 300 degree after, ring parts 1 is hung to car type furnace;
6) cooling to strut 2
Connect previous step, ring parts 1 is hung and two struts 2 carried out after car type furnace coolingly, the type of cooling of described two struts 2 is water cooling; Make two struts 2 depart from ring parts 1, to obtain the ring parts 1 of realistic requirement.
Embodiment 1:
Rolling ring material is 35, height h=900mm, and design external diameter is 4120mm, and radially allowance is 30mm, and modified front outside diameter is 4150, and interior circular diameter is 3600mm, and radially allowance is 30mm, and modified front interior circular diameter is 3570mm.Adopt hardening and tempering process heat treatment, after quenching there is ovalizing deflection in (water-cooled), inner circle minor axis is 3549mm, major axis is 3568mm, minor axis dwindles 21mm, causes periphery half finish turning to occur a large amount of casting skins, and the monolateral allowance of only having 4mm, to subsequent assembly, bring difficulty, need carry out ellipse to it and proofread and correct.
First by rolling ring pad on chassis boiler face, minor axis is vertical with chassis boiler face, measures good height, at rolling ring inner utilization parallels and refractory brick, carries out fulcrum, fulcrum height and rolling ring center is highly close.Enter stove and be heated to 600 ℃, insulation 7h, puts on the fulcrum setting for two struts of 3559mm are orthogonal long after coming out of the stove, and wherein a strut overlaps with short-axis direction.Back into stove heating and thermal insulation, heating-up temperature is 600 ℃, and temperature retention time is 7h.Air cooling after coming out of the stove, after being chilled to surface temperature and being 300 ℃, is winched under stove, utilizes cooling water pipe to the disposal of spraying water of two struts, remove strut after part cool down, carry out dimensional measurement, inner circle minor axis is that 3558mm, major axis are 3560mm.Be that short-axis direction corrects 9mm amount.Make short-axis direction cylindrical allowance be increased to 13mm, dimension correction success; The present invention utilizes that under the condition of high temperature, to be out of shape the intensity of part lower, by the swell increment under the heated condition of two struts, proofreaies and correct, simple to operate, save the energy, and safe and reliable.
The embodiment selecting in this article in order to disclose object of the present invention, current think suitable, but will be appreciated that, the present invention is intended to comprise that all belong to all changes and the improvement of the embodiment in this design and the scope of the invention.
Claims (4)
1. the bearing calibration of ovalizing deflection after one kind large-scale ring parts heat treatment, described method comprises the ovalizing deflection amount, heating and thermal insulation, placement strut (2) of ring parts (1) of measuring, heating and thermal insulation, cooling and to the cooling ring parts that obtains realistic requirement of strut (2) again, it is characterized in that: concrete operation step is as follows:
1) measure the ovalizing deflection amount of ring parts:
First measure the ovalizing deflection amount of ring parts (1), measure inner circle long axis length A and inner circle minor axis length B;
2) heating and thermal insulation:
Connect previous step, ring parts (1) pad of measuring deflection, on car type furnace, is made a mark in the direction of the minor axis B of ring parts (1) periphery, take out after the ring parts marking (1) is put into car type furnace heating and thermal insulation;
3) place strut 2:
Connect previous step, the strut (2) that is (A+B)/2 by two length is vertically placed on the middle part of ring parts (1) inner circle after heating and thermal insulation mutually, and horizontal pad is firm, wherein the two ends of the arbitrary strut (2) in two struts (2) are consistent with the direction of minor axis B;
4) heating and thermal insulation again:
Connect previous step, take out after the good ring parts (1) with two struts (2) of pad is put into car type furnace heating and thermal insulation;
5) cooling
Connect previous step, the ring parts (1) with two struts (2) after coming out of the stove carried out to air cooling, air cooling to the surface temperature of ring parts (1) lower than 300 degree after, ring parts (1) is hung to car type furnace;
6) cooling to strut (2)
Connect previous step, ring parts (1) is hung and two struts (2) carried out after car type furnace coolingly, make two struts (2) depart from ring parts (1), to obtain the ring parts (1) of realistic requirement.
2. the bearing calibration of ovalizing deflection after large-scale ring parts heat treatment according to claim 1, is characterized in that: the material making marks in described step 2 is adeciduate marker at high temperature, described marker is lead oil.
3. the bearing calibration of ovalizing deflection after large-scale ring parts heat treatment according to claim 2, is characterized in that: the heating-up temperature in described step 2 and step 4 is 580 degree-620 degree, and temperature retention time is 6-8.5 hour.
4. the bearing calibration of ovalizing deflection after large-scale ring parts heat treatment according to claim 1, is characterized in that: in described step 6, to the type of cooling of two struts (2), be water cooling.
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| CN201310524843.7A CN103639248B (en) | 2013-10-31 | 2013-10-31 | The bearing calibration of ovalizing deflection after a kind of large-scale ring parts heat treatment |
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Cited By (3)
| 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 |
| CN107186007A (en) * | 2017-05-12 | 2017-09-22 | 中信重工机械股份有限公司 | A kind of bearing calibration under the cold conditions of large-size cylinder body class part heat treatment ovalizing deflection |
| CN115198064A (en) * | 2022-07-28 | 2022-10-18 | 江苏科技大学 | Large-scale metal ring part elliptical deformation shape correction tool and shape correction method |
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Cited By (3)
| 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 |
| CN107186007A (en) * | 2017-05-12 | 2017-09-22 | 中信重工机械股份有限公司 | A kind of bearing calibration under the cold conditions of large-size cylinder body class part heat treatment ovalizing deflection |
| CN115198064A (en) * | 2022-07-28 | 2022-10-18 | 江苏科技大学 | Large-scale metal ring part elliptical deformation shape correction tool and shape correction method |
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| CN103639248B (en) | 2016-05-11 |
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