CN114227172A - Surface treatment process for crane pin shaft - Google Patents
Surface treatment process for crane pin shaft Download PDFInfo
- Publication number
- CN114227172A CN114227172A CN202111606281.1A CN202111606281A CN114227172A CN 114227172 A CN114227172 A CN 114227172A CN 202111606281 A CN202111606281 A CN 202111606281A CN 114227172 A CN114227172 A CN 114227172A
- Authority
- CN
- China
- Prior art keywords
- workpiece
- treatment process
- crane pin
- surface treatment
- dehydrogenation
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004381 surface treatment Methods 0.000 title claims abstract description 13
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 13
- 238000003754 machining Methods 0.000 claims abstract description 12
- 238000005255 carburizing Methods 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 11
- 230000000171 quenching effect Effects 0.000 claims abstract description 11
- 239000002344 surface layer Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 4
- 239000003814 drug Substances 0.000 claims abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A surface treatment process for a crane pin shaft comprises the following steps: rough turning, wherein machining is carried out according to a rough turning drawing, and machining allowance is reserved; step two: carburizing to make carbon atoms penetrate into the surface layer of the workpiece, thereby changing the chemical composition and structure of the surface layer and further changing the performance of the workpiece; step three: semi-finishing; step four: quenching; step five: straightening, namely straightening the quenched workpiece; step six: acid washing; step seven: dehydrogenation; step eight: finish machining, namely grinding the excircle of the workpiece; step nine: bluing, namely putting the workpiece into air-water vapor or chemical medicine to be heated to a proper temperature to form a layer of blue or black oxide film on the surface of the workpiece; step ten: dehydrogenation; step eleven: and (4) oiling and spraying anti-rust oil. Through the steps from the first step to the eleventh step, the crane pin with high strength is obtained, and the product quality and the safety performance in use are improved.
Description
Technical Field
The invention relates to the field of production of crane pin shafts, in particular to a crane pin shaft surface treatment process.
Background
The pin shaft parts are widely applied to the field of cranes and are used for connecting crane arm supports, tower sections and the like.
However, the wear resistance of the crane pin shaft on the market is poor, the crane pin shaft is very easy to wear in the use process, and after the crane pin shaft is used for a long time, the crane pin shaft is excessively worn and even breaks, so that great troubles are brought to the operation of the crane, and even safety accidents can be caused.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a crane pin shaft surface treatment process, which solves the problems in the production of crane pin shafts.
The technical scheme is as follows: the invention provides a surface treatment process for a crane pin shaft, which comprises the following steps
The method comprises the following steps: rough turning, wherein machining is carried out according to a rough turning drawing, and machining allowance is reserved;
step two: carburizing to make carbon atoms penetrate into the surface layer of the workpiece, thereby changing the chemical composition and structure of the surface layer and further changing the performance of the workpiece;
step three: semi-finishing;
step four: quenching;
step five: straightening, namely straightening the quenched workpiece;
step six: acid washing;
step seven: dehydrogenation;
step eight: finish machining, namely grinding the excircle of the workpiece;
step nine: bluing, namely putting the workpiece into air-water vapor or chemical medicine to be heated to a proper temperature to form a layer of blue or black oxide film on the surface of the workpiece;
step ten: dehydrogenation;
step eleven: and (4) oiling and spraying anti-rust oil.
And respectively carrying out dehydrogenation treatment after the pickling step of the sixth step and the bluing step of the ninth step, thereby avoiding the occurrence of cracks on the surface of the workpiece or the occurrence of hydrogen embrittlement fracture during working. Through the steps from the first step to the eleventh step, the crane pin with high strength is obtained, and the product quality and the safety performance in use are improved.
Further, the rough turning allowance of the step one is larger than the heat treatment deformation. And the processing amount is provided for the subsequent semi-finishing and finishing.
Further, the carburizing treatment in the second step adopts a vacuum carburizing method, the temperature is 900-950 ℃, and the thickness is 1-2.5 mm. The workpiece is placed in a vacuum furnace for heating and heat preservation, so that active atoms in a medium in the furnace gradually penetrate into the surface layer of the workpiece, the chemical composition and the structure of the surface layer of the workpiece are changed, the performance of the workpiece is further changed, the surface hardness, the wear resistance and the fatigue strength of the workpiece are improved, and meanwhile, the good toughness of the core part is kept.
Further, the quenching of the fourth step adopts an induction heating mode. The alternating current is utilized to induce huge eddy current on the surface of the workpiece, so that the surface of the workpiece is rapidly heated, the efficiency is high, and the quality is good.
Further, the induction heating condition is: the frequency is 220-320 KHz, and the depth of the quenching layer is 1-2.5 mm.
Further, in the seventh step and the tenth step, the dehydrogenation treatment is carried out 1 hour after the acid washing or the bluing treatment. After the workpiece is subjected to acid washing or bluing treatment, hydrogen in the surface matrix metal diffuses into the workpiece matrix, the quantity of the hydrogen increases along with the time, and if the hydrogen embrittlement treatment is not carried out in time, the crane shaft pin part is broken in the subsequent use process due to the hydrogen embrittlement phenomenon, so that serious consequences are caused.
The technical scheme shows that the invention has the following beneficial effects: the surface of the crane pin shaft is subjected to carburizing treatment and quenching treatment, and the surface of the crane pin shaft is subjected to dehydrogenation respectively after pickling and bluing treatment, so that the wear resistance of the surface of the crane pin shaft is greatly improved, and the hydrogen embrittlement fracture condition in the use process is avoided, thereby prolonging the service life and improving the safety performance of the crane pin shaft.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The following described embodiments are exemplary and are intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
A surface treatment process for a crane pin shaft comprises the following steps: rough turning, wherein machining is carried out according to a rough turning drawing, and machining allowance is reserved;
step two: carburizing to make carbon atoms penetrate into the surface layer of the workpiece, thereby changing the chemical composition and structure of the surface layer and further changing the performance of the workpiece;
step three: semi-finishing;
step four: quenching;
step five: straightening, namely straightening the quenched workpiece;
step six: acid washing;
step seven: dehydrogenation;
step eight: finish machining, namely grinding the excircle of the workpiece;
step nine: bluing, namely putting the workpiece into air-water vapor or chemical medicine to be heated to a proper temperature to form a layer of blue or black oxide film on the surface of the workpiece;
step ten: dehydrogenation;
step eleven: and (4) oiling and spraying anti-rust oil.
The rough turning allowance of the first step is larger than the heat treatment deformation.
And the carburizing treatment in the second step adopts a vacuum carburizing method, the temperature is 900-950 ℃, and the thickness is 1-2.5 mm.
And the quenching of the fourth step adopts an induction heating mode.
The induction heating condition is as follows: the frequency is 220-320 KHz, and the depth of the quenching layer is 1-2.5 mm.
In the seventh step and the tenth step, the dehydrogenation treatment is carried out 1 hour after the acid washing or the bluing treatment.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (6)
1. A surface treatment process for a crane pin shaft is characterized by comprising the following steps: comprises that
The method comprises the following steps: rough turning, wherein machining is carried out according to a rough turning drawing, and machining allowance is reserved;
step two: carburizing to make carbon atoms penetrate into the surface layer of the workpiece, thereby changing the chemical composition and structure of the surface layer and further changing the performance of the workpiece;
step three: semi-finishing;
step four: quenching;
step five: straightening, namely straightening the quenched workpiece;
step six: acid washing;
step seven: dehydrogenation;
step eight: finish machining, namely grinding the excircle of the workpiece;
step nine: bluing, namely putting the workpiece into air-water vapor or chemical medicine to be heated to a proper temperature to form a layer of blue or black oxide film on the surface of the workpiece;
step ten: dehydrogenation;
step eleven: and (4) oiling and spraying anti-rust oil.
2. The crane pin surface treatment process according to claim 1, characterized in that: the rough turning allowance of the first step is larger than the heat treatment deformation.
3. The crane pin surface treatment process according to claim 1, characterized in that: and the carburizing treatment in the second step adopts a vacuum carburizing method, the temperature is 900-950 ℃, and the thickness is 1-2.5 mm.
4. The crane pin surface treatment process according to claim 1, characterized in that: and the quenching of the fourth step adopts an induction heating mode.
5. The crane pin surface treatment process according to claim 4, wherein: the induction heating condition is as follows: the frequency is 220-320 KHz, and the depth of the quenching layer is 1-2.5 mm.
6. The crane pin surface treatment process according to claim 1, characterized in that: in the seventh step and the tenth step, the dehydrogenation treatment is carried out 1 hour after the acid washing or the bluing treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606281.1A CN114227172A (en) | 2021-12-26 | 2021-12-26 | Surface treatment process for crane pin shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606281.1A CN114227172A (en) | 2021-12-26 | 2021-12-26 | Surface treatment process for crane pin shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114227172A true CN114227172A (en) | 2022-03-25 |
Family
ID=80763062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111606281.1A Pending CN114227172A (en) | 2021-12-26 | 2021-12-26 | Surface treatment process for crane pin shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114227172A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632365A (en) * | 2012-03-20 | 2012-08-15 | 常州金马交通工程设备有限公司 | Manufacturing method applicable to cylindrical pin of truss piece |
| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
| CN105108456A (en) * | 2015-08-31 | 2015-12-02 | 重庆创精温锻成型有限公司 | Manufacturing method of new-energy automobile drive motor shaft |
| KR20180124276A (en) * | 2017-05-11 | 2018-11-21 | 유효상 | Method of manufacturing steering output shaft |
| CN112975303A (en) * | 2021-03-24 | 2021-06-18 | 中国航发哈尔滨轴承有限公司 | Processing method of light and thin series sealing structure bearing outer ring |
-
2021
- 2021-12-26 CN CN202111606281.1A patent/CN114227172A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632365A (en) * | 2012-03-20 | 2012-08-15 | 常州金马交通工程设备有限公司 | Manufacturing method applicable to cylindrical pin of truss piece |
| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
| CN105108456A (en) * | 2015-08-31 | 2015-12-02 | 重庆创精温锻成型有限公司 | Manufacturing method of new-energy automobile drive motor shaft |
| KR20180124276A (en) * | 2017-05-11 | 2018-11-21 | 유효상 | Method of manufacturing steering output shaft |
| CN112975303A (en) * | 2021-03-24 | 2021-06-18 | 中国航发哈尔滨轴承有限公司 | Processing method of light and thin series sealing structure bearing outer ring |
Non-Patent Citations (5)
| Title |
|---|
| 中国机械工程学会热处理专业学会等: "《热处理手册》", 31 October 1992, 机械工业出版社 * |
| 朱培瑜: "《常见零件热处理变形与控制》", 31 December 1990, 机械工业出版社 * |
| 轮机工程手册编委会: "《轮机工程手册》", 30 November 1992, 人民交通出版社 * |
| 钟华仁: "《热处理质量控制》", 30 September 1990, 国防工业出版社 * |
| 高钟秀: "《钳工基本技术》", 31 July 2002, 金盾出版社 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220325 |
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