CN105714040A - Gear machining and heat treatment process - Google Patents

Gear machining and heat treatment process Download PDF

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Publication number
CN105714040A
CN105714040A CN201410721220.3A CN201410721220A CN105714040A CN 105714040 A CN105714040 A CN 105714040A CN 201410721220 A CN201410721220 A CN 201410721220A CN 105714040 A CN105714040 A CN 105714040A
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CN
China
Prior art keywords
gear
cooling
nitriding
annealing
normalizing
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
Application number
CN201410721220.3A
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Chinese (zh)
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Yuanhuang Machinery Manufacturing Co Ltd
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Chongqing Yuanhuang Machinery Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chongqing Yuanhuang Machinery Manufacturing Co Ltd filed Critical Chongqing Yuanhuang Machinery Manufacturing Co Ltd
Priority to CN201410721220.3A priority Critical patent/CN105714040A/en
Publication of CN105714040A publication Critical patent/CN105714040A/en
Pending legal-status Critical Current

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Abstract

The present invention discloses a gear machining and heat treatment process, and the gear machining process successively comprises forging, normalizing, quenching and tempering, vertical machining, gear shaping, annealing, vertical machining, gear shaping, vertical milling, stabilizing aging, gear grinding, nitriding and finished product inspection, wherein the step of normalizing is normalizing at (880 +/-10) DEG C for (3-4) h, and then cooling in air; the step of quenching and tempering is quenching and tempering at (850 +/-10) DEG C for (3-4) h, quenching with water, and cooling with oil; the step of the annealing is annealing at (530 +/-10) DEG C for (3-4) h, cooling in a furnace in the heating and cooling rate of less than or equal to 50 DEG C / h; the step of stabilizing aging is stabilizing aging at (510 +/-10) DEG C for (3-4) h, and cooling in the furnace in the heating and cooling rate of less than or equal to 2 5 DEG C / h; and the step of nitriding is nitriding at (510 +/-10) DEG C for (10-12) h, and cooling in the furnace in the heating and cooling rate of less than or equal to 2 5 DEG C / h. The gear machining and heat treatment process is more reasonable, and can reduce distortion after nitriding to improve the overall performance of a gear.

Description

A kind of Gear Processing and Technology for Heating Processing
Technical field
The invention belongs to metal heating processing technology field, specifically a kind of Gear Processing and Technology for Heating Processing.
Background technology
Gear Processing flow process: forging → normalizing → modified → vertical car → gear shaping → annealing → vertical car → gear shaping → Vertical Mill → stablize timeliness → roll flute → nitriding → product inspection.Carrying out Nitrizing Treatment technique after roll flute finished product, nitriding is last procedure of gear, it is ensured that the high accuracy grade of gear is it is necessary to strictly control nitriding deformation.And in actual production, the distortion after nitriding is always up perplexing the difficult problem that domestic and international heat treatment produces.Once deformation can not effectively control, reducing the accuracy class of gear, whole gear train assembly can produce impact shock and noise when running, reduce reliability of operation and affect machine life.
Summary of the invention
It is an object of the invention to for Shortcomings part in above-mentioned technology, the present invention provides a kind of Gear Processing and Technology for Heating Processing, and its technique is more reasonable, can reduce the distortion after nitriding, improves gear combination property.
The technical scheme realizing the object of the invention is as follows:
A kind of Gear Processing and Technology for Heating Processing, described Gear Processing flow process is that forging → normalizing → modified → vertical car → gear shaping → annealing → stand car → gear shaping → Vertical Mill → stablize timeliness → roll flute → nitriding → product inspection is characterized in that, described normalizing process is (880 ± 10) DEG C × (3~4) h, air cooling;Described modified operation is (850 ± 10) DEG C × (3~4) h, water quenching and oil-cooling;Described annealing operation is (530 ± 10) DEG C × (3~4) h, and stove is cold, warming and cooling rate≤50 DEG C/h;Described stable aging sequence is (510 ± 10) DEG C × (3-4) h, and stove is cold, warming and cooling rate≤25 DEG C/h;Described nitriding operation is (510 ± 10) DEG C × (10~12) h, and stove is cold, warming and cooling rate≤25 DEG C/h.
A kind of Gear Processing of the present invention and Technology for Heating Processing, it is modified, quenching technical is changed into water quenching and oil-cooling from oil cooling, advantage for subsequent control deformation is: improve the depth of hardening zone of gear, adopting oil cooling technique, gear hobbing backgear only has a tooth top part to be in quench-hardened case, adopts water quenching and oil-cooling technique, the back-geared tooth top of gear hobbing and tooth root, all in quench-hardened case, reduce the deflection caused due to histological difference;Improving gear centre hardness, material at high temperature flow drag improves;Improve temperature, eliminate stress abundant;Anneal and stablize timeliness, increasing before finishing grinding tooth and once stablize Ageing Treatment, reducing the machining stress of gear shaping, corase grind tooth generation;Stress relief annealing creates two advantages: heating-up temperature is low, thermal stress is little;Firing rate is slow, and thermograde is little;These 2 are all conducive to Stress Release and twist cell to reply process slowly, thus deforming reduction;Glow discharge nitriding is entering the stove initial stage, and the temperature difference that each position exists is relatively big, and the position that produced thermal stress is enough to make to take the lead in reaching a high temperature occurs flow to cause deformation.Programming rate and ammonia flow are also the key factors affecting nitriding quality.Control heating, cooling speed≤25 DEG C/h during nitriding, improve the heating uniformity at each position of gear, it is to avoid the deformation that the temperature difference produces thermal stress and causes, adopt new nitridation process, gear matrix strength is improved, and the distortion of glow discharge nitriding gear is effectively controlled.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
A kind of Gear Processing and Technology for Heating Processing, described Gear Processing flow process is that forging → normalizing → modified → vertical car → gear shaping → annealing → stand car → gear shaping → Vertical Mill → stablize timeliness → roll flute → nitriding → product inspection is characterized in that, described normalizing process is (880 ± 10) DEG C × (3~4) h, air cooling;Described modified operation is (850 ± 10) DEG C × (3~4) h, water quenching and oil-cooling;Described annealing operation is (530 ± 10) DEG C × (3~4) h, and stove is cold, warming and cooling rate≤50 DEG C/h;Described stable aging sequence is (510 ± 10) DEG C × (3-4) h, and stove is cold, warming and cooling rate≤25 DEG C/h;Described nitriding operation is (510 ± 10) DEG C × (10~12) h, and stove is cold, warming and cooling rate≤25 DEG C/h.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.All technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a Gear Processing and Technology for Heating Processing, described Gear Processing flow process is forging → normalizing → modified → vertical car → gear shaping → annealing → stand car → gear shaping → Vertical Mill → stablize timeliness → roll flute → nitriding → product inspection, it is characterized in that, described normalizing process is (880 ± 10) DEG C × (3~4) h, air cooling;Described modified operation is (850 ± 10) DEG C × (3~4) h, water quenching and oil-cooling;Described annealing operation is (530 ± 10) DEG C × (3~4) h, and stove is cold, warming and cooling rate≤50 DEG C/h;Described stable aging sequence is (510 ± 10) DEG C × (3-4) h, and stove is cold, warming and cooling rate≤25 DEG C/h;Described nitriding operation is (510 ± 10) DEG C × (10~12) h, and stove is cold, warming and cooling rate≤25 DEG C/h.
CN201410721220.3A 2014-12-03 2014-12-03 Gear machining and heat treatment process Pending CN105714040A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410721220.3A CN105714040A (en) 2014-12-03 2014-12-03 Gear machining and heat treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410721220.3A CN105714040A (en) 2014-12-03 2014-12-03 Gear machining and heat treatment process

Publications (1)

Publication Number Publication Date
CN105714040A true CN105714040A (en) 2016-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410721220.3A Pending CN105714040A (en) 2014-12-03 2014-12-03 Gear machining and heat treatment process

Country Status (1)

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CN (1) CN105714040A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106191759A (en) * 2016-08-23 2016-12-07 常州新区河海热处理工程有限公司 Reduce the vacuum glow glow discharge nitriding technique of industrial robot precision gear deformation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106191759A (en) * 2016-08-23 2016-12-07 常州新区河海热处理工程有限公司 Reduce the vacuum glow glow discharge nitriding technique of industrial robot precision gear deformation

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Application publication date: 20160629

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