CN104745794A - Thin-wall carburization gear ring salt-bath quenching circle checking technology - Google Patents
Thin-wall carburization gear ring salt-bath quenching circle checking technology Download PDFInfo
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- CN104745794A CN104745794A CN201510147676.8A CN201510147676A CN104745794A CN 104745794 A CN104745794 A CN 104745794A CN 201510147676 A CN201510147676 A CN 201510147676A CN 104745794 A CN104745794 A CN 104745794A
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Abstract
The invention relates to a circle checking technology and especially relates to a thin-wall carburization gear ring salt-bath quenching circle checking technology. According to the thin-wall carburization gear ring salt-bath quenching circle checking technology, the elastic-plastic characteristic of the thin-wall carburization gear ring material is utilized, so that the circle checking is realized; the elastic-plastic characteristic of the material is utilized as the basis of the circle checking technology so as to control the post-carburization deformation, so that the deformation after the salt-bath quenching is greatly reduced; the thin-wall carburization gear ring salt-bath quenching circle checking technology provides a new direction to the deformation correction theory; moreover, the thin-wall carburization gear ring salt-bath quenching circle checking technology has got feasible practical effect and is capable of regularizing the size by tempering after the circle checking process.
Description
Technical field
The present invention relates to a kind of school sired results skill, especially a kind of thin-walled carburizing gear ring salt bath quenching school sired results skill.
Background technology
The greatest problem of thin-walled gear ring carburizing and quenching is distortion, and especially ovalizing deflection is extremely difficult controls.At present, for the gear ring carburizing part of diameter 3 meters, all cannot perfect controlling distortion by adjustment thermal treatment temp, time, shove charge means etc.
Thin-walled gear ring quenchant is oil and salt bath mainly, and salt bath medium temperature is up to 170 DEG C, and for the oil relative to 60 ~ 80 DEG C, salt bath quenching distortion is relatively little.Adopt salt bath quenching technique, gear ring distortion determines primarily of carbon impregnation stage, certain relation is there is between carburizing deflection and quenching strain amount, customary quenching ovalizing deflection amount increases by 30 ~ 40% on carburizing distortion found, control carburizing distortion and effectively can control the after strain that quenches, being out of shape before therefore control carburizing distortion controls quenching in other words becomes key node.If carburizing after strain goes beyond the scope, then must be saved by some means.
Need roll flute can finished product after the thermal treatment of carburizing and quenching gear ring, whether the amount of having is the major criterion checking heat treatment deformation excellent to roll flute, 3 rice diameter gear ring ellipses more than roll flute during 3mm by overproof, so ovalizing deflection must control within 2mm before its quenching, carburizing ovalizing deflection then needs to correct more than 2mm.
Summary of the invention
The technical problem to be solved in the present invention is: based on the problems referred to above, the invention provides a kind of thin-walled carburizing gear ring salt bath quenching school sired results skill, is to utilize the elastoplasticity feature of material to realize school circle.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of thin-walled carburizing gear ring salt bath quenching school sired results skill, it is characterized in that comprising following processing step:
A. heat: thin-walled carburizing gear ring is put into process furnace and is heated to 500 ~ 600 DEG C, insulation 1 ~ 1.5h, heat-up time is decided according to the wall thickness of carburizing gear ring: every 100mm wall thickness heats 1 hour;
B. deflection is surveyed: by measuring the length of the rear thin-walled carburizing gear ring major axis of heating and minor axis, obtain carburizing ovalizing deflection amount;
C. correcting tool is installed: correcting tool is placed in minor axis, guarantees that the minor axis amount of ejecting is 2.5 times of carburizing ovalizing deflection amounts;
D. naturally cooling: the state keeping step (c), until thin-walled carburizing gear ring naturally cools to 225 ~ 275 DEG C;
E. survey deflection again: removal correcting tool, measure the length of naturally cooling rear wall carburizing gear ring major axis and minor axis, obtain the deflection in the circle scope of school;
F. tempering: the thin-walled carburizing gear ring after high-ranking officers' circle carries out tempering, and tempering temperature is 225 ~ 275 DEG C, and tempering time decides according to the wall thickness of carburizing gear ring: every 100mm wall thickness heats 2 hours;
G. finished product: the thin-walled carburizing gear ring of tempering naturally cools to normal temperature, namely completes school circle.
Further, the correcting tool in step (c) is made up of screw block, push rod and circular arc cushion block.
Further, described circular arc cushion block is close to gear ring inwall.Circular arc cushion block can reduce stress concentration, prevents gear ring from ftractureing.
Correct the gear ring ellipse short shaft thermal recalibration adopting the heating of jack pair entirety, if gear ring Heating temperature is low, as 280 DEG C, gear ring intensity is high, and during low temperature, elastic region is large, viscous deformation difficulty occurs large, and along with temperature raises, elastic region will reduce, and corrects difficulty and reduces; The too high then operational difficulty of Heating temperature, facts have proved that to be heated to 500 ~ 600 DEG C of calibration results best, elastic region significantly reduces, and low-stress can produce viscous deformation.
The invention has the beneficial effects as follows: according to the elastoplastic property of the material basis as school sired results skill, control the distortion after carburizing, greatly can reduce the distortion of salt bath quenching, for distortion correction theory finds new direction, and obtain feasible practice effect, carry out tempering, curable size after the circle of school.
Accompanying drawing explanation
Below in conjunction with accompanying drawing embodiment, the present invention is further described.
Fig. 1 is structural representation of the present invention.
In figure: 1. gear ring, 1 '. minor axis, 1 ". major axis, 2. screw block, 3. push rod, 4. circular arc cushion block.
Embodiment
The invention will be further described in conjunction with specific embodiments now, and following examples are intended to the present invention instead of limitation of the invention further are described.
Embodiment 1
Thin-walled carburizing gear ring 1 is put into process furnace and be heated to 550 DEG C of insulations 1 hour, correcting tool is placed in minor axis 1 ', and the minor axis 1 ' amount of ejecting is 2.5 times of carburizing ovalizing deflection amounts, and gear ring 1 naturally cools to 250 DEG C of removal correcting tools, survey distortion again, reach calibration result and then carry out 250 DEG C of temper.
Facts have proved that carburizing post-equalization adds destressing process, salt bath quenching after strain can not rebound, and effectively prevent quenching strain accumulation problem by carburizing post-equalization.550 DEG C of optimum tempss being thin-walled carburizing gear ring 1 and correcting, implement the oval correcting value of 2.5 times of carburizings and get final product school circle, carry out 250 DEG C of tempering after the circle of school, and gear ring 1 temperature when being not less than dismounting correcting tool, curable size.
Aligning tool is made up of screw block 2, push rod 3 and circular arc cushion block 4, and circular arc cushion block 4 can reduce stress concentration, prevents gear ring 1 from ftractureing.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to right.
Claims (3)
1. a thin-walled carburizing gear ring salt bath quenching school sired results skill, is characterized in that comprising following processing step:
A. heat: thin-walled carburizing gear ring (1) is put into process furnace and is heated to 500 ~ 600 DEG C, insulation 1 ~ 1.5h, heat-up time is decided according to the wall thickness of carburizing gear ring (1): every 100mm wall thickness heats 1 hour;
B. deflection is surveyed: (1 ") and the length of minor axis (1 '), obtain carburizing ovalizing deflection amount by measuring rear thin-walled carburizing gear ring (1) major axis of heating;
C. correcting tool is installed: correcting tool is placed in minor axis (1 '), guarantees that minor axis (1 ') amount of ejecting is 2.5 times of carburizing ovalizing deflection amounts;
D. naturally cooling: the state keeping step (c), until thin-walled carburizing gear ring (1) naturally cools to 225 ~ 275 DEG C;
E. survey deflection again: removal correcting tool, (1 ") and the length of minor axis (1 '), obtain the deflection in the circle scope of school to measure naturally cooling rear wall carburizing gear ring (1) major axis;
F. tempering: the thin-walled carburizing gear ring (1) after high-ranking officers' circle carries out tempering, and tempering temperature is 225 ~ 275 DEG C, and tempering time decides according to the wall thickness of carburizing gear ring (1): every 100mm wall thickness heats 2 hours;
G. finished product: the thin-walled carburizing gear ring (1) of tempering naturally cools to normal temperature, namely completes school circle.
2. a kind of thin-walled carburizing gear ring salt bath quenching school according to claim 1 sired results skill, is characterized in that: the correcting tool in step (c) is made up of screw block (2), push rod (3) and circular arc cushion block (4).
3. a kind of thin-walled carburizing gear ring salt bath quenching school according to claim 1 sired results skill, is characterized in that: described circular arc cushion block (4) is close to gear ring (1) inwall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510147676.8A CN104745794A (en) | 2015-03-31 | 2015-03-31 | Thin-wall carburization gear ring salt-bath quenching circle checking technology |
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| CN201510147676.8A CN104745794A (en) | 2015-03-31 | 2015-03-31 | Thin-wall carburization gear ring salt-bath quenching circle checking technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106854686A (en) * | 2015-12-08 | 2017-06-16 | 上海新力动力设备研究所 | A kind of shaping methods of ultrahigh-strength steel thin-wall housing quenching distortion |
| 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 |
| CN107312921A (en) * | 2017-05-16 | 2017-11-03 | 沈阳透平机械股份有限公司 | A kind of method for reducing thin-walled carburizing and quenching high gear amount of distortion and application |
| CN108251624A (en) * | 2017-12-28 | 2018-07-06 | 上海交通大学 | A kind of thin-wall high temperature alloy precision casting local deformation is heat-treated antidote |
| CN111604390A (en) * | 2020-06-02 | 2020-09-01 | 安徽米科智能科技有限公司 | Automatic roundness correction machine for inner gear ring |
-
2015
- 2015-03-31 CN CN201510147676.8A patent/CN104745794A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106854686A (en) * | 2015-12-08 | 2017-06-16 | 上海新力动力设备研究所 | A kind of shaping methods of ultrahigh-strength steel thin-wall housing quenching distortion |
| CN106854686B (en) * | 2015-12-08 | 2019-05-07 | 上海新力动力设备研究所 | A kind of shaping methods of ultrahigh-strength steel thin-wall shell quenching distortion |
| 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 |
| CN107312921A (en) * | 2017-05-16 | 2017-11-03 | 沈阳透平机械股份有限公司 | A kind of method for reducing thin-walled carburizing and quenching high gear amount of distortion and application |
| CN107312921B (en) * | 2017-05-16 | 2019-07-30 | 沈阳透平机械股份有限公司 | A kind of method and application reducing thin-walled carburizing and quenching high gear amount of distortion |
| CN108251624A (en) * | 2017-12-28 | 2018-07-06 | 上海交通大学 | A kind of thin-wall high temperature alloy precision casting local deformation is heat-treated antidote |
| CN111604390A (en) * | 2020-06-02 | 2020-09-01 | 安徽米科智能科技有限公司 | Automatic roundness correction machine for inner gear ring |
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