CN115679242A - Machining process for reducing deformation of low-carbon alloy steel gear - Google Patents
Machining process for reducing deformation of low-carbon alloy steel gear Download PDFInfo
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- CN115679242A CN115679242A CN202211269596.6A CN202211269596A CN115679242A CN 115679242 A CN115679242 A CN 115679242A CN 202211269596 A CN202211269596 A CN 202211269596A CN 115679242 A CN115679242 A CN 115679242A
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- alloy steel
- carbon alloy
- deformation
- steel gear
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- 238000003754 machining Methods 0.000 title claims abstract description 39
- 229910001339 C alloy Inorganic materials 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 238000007514 turning Methods 0.000 claims abstract description 8
- 238000005255 carburizing Methods 0.000 claims abstract description 6
- 230000032683 aging Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000035882 stress Effects 0.000 abstract description 5
- 230000008646 thermal stress Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a processing technology for reducing the deformation of a low-carbon alloy steel gear, which comprises the following steps of: (1) reserving machining allowance on the end face according to the depth of a carburized layer before carburization; (2) reserving machining allowance in the inner hole according to the depth of the carburized layer before carburization; (3) a high-temperature tempering process is added after carburizing and air cooling; (4) turning the end face and boring to remove a carburized layer; (5) in the quenching stage, the gear is vertically placed, and tempering is carried out in time after quenching; (6) turning the end face and digging a groove after tempering; (7) the artificial aging is added after the grooving process, the processing technology for reducing the deformation of the low-carbon alloy steel gear increases the structural strength of the low-carbon alloy steel gear, reduces the deformation of the low-carbon alloy steel gear caused by the structural change and the thermal stress change during quenching, removes the processing stress, reduces the deformation, and effectively ensures the quality of the low-carbon alloy steel gear.
Description
Technical Field
The invention relates to the technical field of gear machining, in particular to a machining process for reducing the deformation of a low-carbon alloy steel gear.
Background
Carburizing heat treatment refers to a chemical heat treatment method in which carbon atoms penetrate into the surface of a workpiece (low-carbon steel or low-carbon alloy steel) in a carburizing medium at a certain temperature to change the carbon concentration of the surface of the workpiece, so that a certain surface carbon content and a certain concentration gradient are obtained. The carburized product is quenched to obtain high surface hardness, wear resistance, core toughness and high contact fatigue and bending fatigue strength. Generally, the gear machining process flow is as follows: blank-machining-gear hobbing-carburization, quenching, tempering-gear grinding-flaw detection-cleaning-warehousing. The intermediate gear has a complex structure, and when the diameter and the thickness of the intermediate gear are large, the processing process is easy to deform, and the flatness is not easy to guarantee. There is a need for a process that reduces the deformation of gears made of low carbon alloy steel, with fewer or no such occurrences.
The conventional methods are disclosed in the following documents, such as the authorization notice number: CN201310562860.X discloses a machining method for preventing deformation of a low-carbon steel gear, which is characterized in that groove fillets are roughly turned at the early stage, through holes at the groove are filled with materials in the heat treatment process, the carbon potential and temperature in the heat treatment furnace are controlled, and the deformation generated in the heat treatment process is avoided. But the invention has obvious defects that the deformation of the gear is influenced by the conditions that the first filler is not tightly pressed, gaps are left and the like; the second filler may have flaking during heat treatment to affect the quenching quality; and thirdly, the time and labor for preparing fillers, filling and the like are wasted, and the labor and material costs are increased, so that a machining process for reducing the deformation of the low-carbon alloy steel gear is needed to solve the technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects, provide a processing technology for reducing the deformation of the low-carbon alloy steel gear, increase the structural strength of the low-carbon alloy steel gear, reduce the deformation of the low-carbon alloy steel gear caused by the structural change and the thermal stress change during quenching, remove the processing stress, reduce the deformation, and effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a machining process for reducing the deformation of a low-carbon alloy steel gear comprises the following steps:
(1) reserving machining allowance on the end face according to the depth of a carburized layer before carburization;
(2) reserving machining allowance in the inner hole according to the depth of the carburized layer before carburization;
(3) a high-temperature tempering process is added after carburizing and air cooling;
(4) turning the end face and boring to remove a carburized layer;
(5) in the quenching stage, the gear is vertically placed, and tempering is carried out in time after quenching;
(6) turning the end face and digging a groove after tempering;
(7) and artificial aging is added after the grooving process.
As a preferable technical scheme of the invention, the size of the machining allowance reserved on the end face in the step (1) is twice of the depth of the infiltrated layer.
As a preferable technical scheme of the invention, the size of the machining allowance reserved for the inner hole in the step (2) is twice of the depth of the infiltrated layer.
As a preferable technical scheme of the invention, the temperature of the high-temperature tempering in the step (3) is controlled to be 640 +/-10 ℃.
As a preferable technical scheme of the invention, in the step (7), the human labor efficiency control temperature is 140 +/-10 ℃.
Compared with the prior art, the invention has the beneficial effects that: (1) The machining process for reducing the deformation of the low-carbon alloy steel gear ensures that the low-carbon alloy steel gear has certain structural strength in the quenching stage by reasonably arranging machining allowance and procedure sequence, removes machining stress, reduces quenching deformation, reduces the surface hardness of parts by adding high-temperature tempering refined carbide after carburization, is favorable for removing a non-working-surface carburized layer, and does not influence subsequent machining; (2) The machining allowance reserved in the quenching stage is utilized, so that the structural strength of the low-carbon alloy steel gear is improved, and the deformation of the low-carbon alloy steel gear caused by the structure change and the thermal stress change in the quenching process is reduced, and the parts are unqualified; (3) The artificial aging is added before gear grinding, the machining stress generated by the end face of the vehicle and the groove is removed, the deformation trend of the low-carbon alloy steel gear is further reduced, and the deformation problem of the low-carbon alloy steel gear, particularly the low-carbon alloy steel gear with larger diameter and thickness, is solved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a machining process for reducing the deformation of a low-carbon alloy steel gear comprises the following steps of:
(1) reserving machining allowance on the end face according to the depth of the carburized layer before carburization, wherein the size of the machining allowance is twice of the depth of the carburized layer;
(2) reserving machining allowance in the inner hole according to the depth of the carburized layer before carburization, wherein the size of the machining allowance is two times of the depth of the carburized layer;
(3) a high-temperature tempering procedure is added after carburizing and air cooling, and the temperature is controlled to be 640 +/-10 ℃;
(4) turning the end face and boring to remove a carburized layer;
(5) in the quenching stage, the gear is vertically placed, and tempering is carried out in time after quenching;
(6) turning the end face and digging a groove after tempering;
(7) after the grooving process, artificial aging is added, and the temperature is controlled to be 140 +/-10 ℃.
Through production verification on the diesel engine intermediate gear shaft, the flatness of the intermediate gear quenched by the processing technology is within 0.2mm, and no distortion is found.
The invention reasonably arranges the machining allowance and the sequence of the working procedures, does not need protective measures like refractory clay and the like, not only ensures that the low-carbon alloy steel gear has certain structural strength in the quenching stage, but also optimizes the machining process flow of the gear, removes the machining stress, reduces the deformation and ensures the quality of the low-carbon alloy steel gear.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A machining process for reducing the deformation of a low-carbon alloy steel gear is characterized by comprising the following steps of: the method comprises the following steps:
(1) reserving machining allowance on the end face according to the depth of a carburized layer before carburization;
(2) reserving machining allowance in the inner hole according to the depth of the carburized layer before carburization;
(3) a high-temperature tempering process is added after carburizing and air cooling;
(4) turning the end face and boring to remove a carburized layer;
(5) in the quenching stage, the gear is vertically placed, and tempering is performed in time after quenching;
(6) turning the end face and digging a groove after tempering;
(7) and artificial aging is added after the grooving process.
2. The machining process for reducing the deformation of the low-carbon alloy steel gear according to claim 1, wherein the machining process comprises the following steps of: and (2) the size of the machining allowance reserved on the end face in the step (1) is twice of the depth of the penetrated layer.
3. The machining process for reducing the deformation of the low-carbon alloy steel gear according to claim 1, wherein the machining process comprises the following steps of: and (3) the size of the reserved machining allowance of the inner hole in the step (2) is twice of the depth of the penetrated layer.
4. The process of claim 1 for reducing the distortion of a gear made of a low carbon alloy steel, wherein the process comprises the steps of: the temperature of the high-temperature tempering in the step (3) is controlled to be 640 +/-10 ℃.
5. The machining process for reducing the deformation of the low-carbon alloy steel gear according to claim 1, wherein the machining process comprises the following steps of: and (4) in the step (7), the temperature is controlled to be 140 +/-10 ℃ during manual labor efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211269596.6A CN115679242A (en) | 2022-10-18 | 2022-10-18 | Machining process for reducing deformation of low-carbon alloy steel gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211269596.6A CN115679242A (en) | 2022-10-18 | 2022-10-18 | Machining process for reducing deformation of low-carbon alloy steel gear |
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| CN115679242A true CN115679242A (en) | 2023-02-03 |
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| CN202211269596.6A Pending CN115679242A (en) | 2022-10-18 | 2022-10-18 | Machining process for reducing deformation of low-carbon alloy steel gear |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104562048A (en) * | 2014-10-17 | 2015-04-29 | 芜湖扬宇机电技术开发有限公司 | Heat treatment process for En40B type rock drilling tool shank |
| WO2017137209A1 (en) * | 2016-02-09 | 2017-08-17 | Siemens Aktiengesellschaft | Method for producing a gear wheel, gear wheel, geared compressor |
| CN110846472A (en) * | 2019-11-27 | 2020-02-28 | 中国航发中传机械有限公司 | Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear |
| CN114058827A (en) * | 2021-11-26 | 2022-02-18 | 西安煤矿机械有限公司 | Method for controlling hardness of spline after gear carburization integral quenching |
-
2022
- 2022-10-18 CN CN202211269596.6A patent/CN115679242A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104562048A (en) * | 2014-10-17 | 2015-04-29 | 芜湖扬宇机电技术开发有限公司 | Heat treatment process for En40B type rock drilling tool shank |
| WO2017137209A1 (en) * | 2016-02-09 | 2017-08-17 | Siemens Aktiengesellschaft | Method for producing a gear wheel, gear wheel, geared compressor |
| CN110846472A (en) * | 2019-11-27 | 2020-02-28 | 中国航发中传机械有限公司 | Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear |
| CN114058827A (en) * | 2021-11-26 | 2022-02-18 | 西安煤矿机械有限公司 | Method for controlling hardness of spline after gear carburization integral quenching |
Non-Patent Citations (1)
| Title |
|---|
| 宋福生 主编: "《电子机械零部件制造工艺学》", 31 May 1990, 东南大学出版社, pages: 106 - 107 * |
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