CN112692221A - Automobile half shaft hot processing technology - Google Patents
Automobile half shaft hot processing technology Download PDFInfo
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- CN112692221A CN112692221A CN202011618636.4A CN202011618636A CN112692221A CN 112692221 A CN112692221 A CN 112692221A CN 202011618636 A CN202011618636 A CN 202011618636A CN 112692221 A CN112692221 A CN 112692221A
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Abstract
The invention discloses a hot working process of an automobile half shaft, which comprises the following steps: (1) blanking and induction heating quenching: performing medium-frequency induction quenching on the blank at 900 ℃, performing induction heating for 20s, and refining grains; (2) induction hot upsetting: performing intermediate frequency induction heating at 1050 ℃, and completing head forming within 30 s; (3) molding a flange: the flange extrusion is finished within 2s at the temperature of 950 +/-10 ℃ by die pressing; (4) quenching by waste heat: precooling to 850-860 ℃, continuously quenching, and quenching into 10% PAG aqueous solution, wherein the temperature of the aqueous solution is controlled below 30 ℃; (5) tempering: for a 40Cr half shaft: at the temperature of 610-630 ℃, for 3-4 h; for a 42CrMo half shaft: 640-660 ℃ for 3-4 h. The automobile half shaft hot processing technology adopts normalizing instead of tempering and utilizes the rest of hot quenching, thereby saving energy consumption remarkably, improving the performance of the half shaft, particularly the fatigue performance, improving the qualification rate from 75 percent to 100 percent and having considerable economic benefit. Meanwhile, the method is convenient for product automation and intelligentization, and is a new technology for producing the automobile half shaft, which is widely applied and benefits the nation and the people.
Description
Technical Field
The invention relates to a hot processing technology of an automobile half shaft, in particular to a treatment technology of hot-out middle upsetting, compression molding and waste heat continuous quenching of a 40Cr and 42CrMo half shaft.
Background
At present, the automobile industry as the pillar industry plays an important role in national economy, the automobile half shaft is a main automobile part, and the demand of the automobile half shaft is increasing along with the development of the automobile industry. The traditional hot processing technology of the automobile half shaft adopts a box-type furnace heating mode, a normalizing process is carried out before a quenching and tempering technology, the energy consumption is high, continuous operation cannot be carried out, and the yield of batch production is low; the production process mainly depends on manual operation, and the automation efficiency is low. Therefore, it is urgent to optimize the automobile half-axle heating process, reduce energy consumption and improve the qualification rate of products.
Disclosure of Invention
Aiming at the prior art, the invention provides a hot processing technology for an automobile half shaft, which reduces energy consumption by changing the traditional process, controlling technological parameters and the like, and improves the product yield of the automobile half shaft by changing the operation mode.
The invention is realized by the following technical scheme:
a hot working process for an automobile half shaft comprises the following steps:
(1) blanking and induction heating quenching: performing medium-frequency induction quenching on the blank at 900 ℃, performing induction heating for 20s, and refining grains;
(2) induction hot upsetting: performing intermediate frequency induction heating at 1050 ℃, and completing head forming within 30 s;
(3) molding a flange: the flange extrusion is finished within 2s at the temperature of 950 +/-10 ℃ by die pressing;
(4) quenching by waste heat: precooling to 850-860 ℃, continuously quenching, and quenching into 10% PAG aqueous solution (polyalkylene glycol water-soluble quenching medium), wherein the temperature of the aqueous solution is controlled below 30 ℃;
(5) tempering: specifically, for a 40Cr half shaft: at the temperature of 610-630 ℃, for 3-4 h; for a 42CrMo half shaft: 640-660 ℃ for 3-4 h.
The invention discloses a hot processing technology of an automobile half shaft, which relates to links such as an upsetting technology, a die pressing technology, a waste heat quenching technology, a continuous operation and the like, can realize automatic and intelligent production by completing the conversion of each station by using a manipulator, and can realize continuous production due to reasonable matching among the processes of each link. The upsetting forming time is short, the upsetting is finished within 30s, conditions are created for continuous operation, and the single-station-multi-station continuous operation is cooled to be formed within 100 ℃. The whole molding time of the half shaft is short, the molding is completed within 1 minute, and when the temperature of the molded half shaft is reduced to 860 ℃, the continuous quenching treatment is implemented, so that the qualification rate is greatly improved.
Compared with the traditional process, the hot processing process for the automobile half shaft breaks through the traditional normalizing and tempering processes, realizes the quenching process by utilizing waste heat after multi-step temperature heat preservation, and realizes energy conservation and consumption reduction; the heating mode of the box furnace is changed into the induction heating mode, and the single continuous production realizes the continuous operation. The waste heat quenching and continuous operation are high in efficiency and energy-saving, the full-load production of two production lines is taken as an example, the cost of each half shaft can be reduced by 5.1 yuan, the yield of each production line is 1000 yuan per day, the production is carried out for 30 days each month, and the cost can be saved by 367.2 ten thousand yuan per year.
The automobile half shaft hot processing technology adopts normalizing instead of tempering and utilizes the rest of hot quenching, thereby saving energy consumption remarkably, improving the performance of the half shaft, particularly the fatigue performance, improving the qualification rate from 75 percent to 100 percent and having considerable economic benefit. Meanwhile, the method is convenient for product automation and intelligentization, and is a new technology for producing the automobile half shaft, which is widely applied and benefits the nation and the people.
The various terms and phrases used herein have the ordinary meaning as is well known to those skilled in the art. To the extent that the terms and phrases are not inconsistent with known meanings, the meaning of the present invention will prevail.
Drawings
FIG. 1: the invention discloses a half shaft hot processing process schematic diagram.
FIG. 2: the invention relates to a flow chart of a half shaft hot processing technology.
Detailed Description
The present invention will be further described with reference to the following examples. However, the scope of the present invention is not limited to the following examples. It will be understood by those skilled in the art that various changes and modifications may be made to the invention without departing from the spirit and scope of the invention.
The present invention has been described generally and/or specifically with respect to materials used in testing and testing methods. Although many materials and methods of operation are known in the art for the purpose of carrying out the invention, the invention is nevertheless described herein in as detail as possible.
The instruments, reagents, materials and the like used in the following examples are conventional instruments, reagents, materials and the like in the prior art and are commercially available in a normal manner unless otherwise specified. Unless otherwise specified, the experimental methods, detection methods, and the like described in the following examples are conventional experimental methods, detection methods, and the like in the prior art.
EXAMPLE 1 axle shaft Hot working
The traditional process flow of the half shaft is as follows: blanking, forging, normalizing (preheating), machining, quenching and tempering, induction surface quenching and tempering.
The novel process flow of the half shaft is as follows: blanking, induction heating quenching, induction hot upsetting, die pressing of a flange, quenching and tempering, as shown in figures 1 and 2, specifically, the steps are as follows:
(1) blanking and induction heating quenching: performing medium-frequency induction quenching on the blank at 900 ℃, performing induction heating for 20s, and refining grains;
(2) induction hot upsetting: performing intermediate frequency induction heating at 1050 ℃, and completing head forming within 30 s;
(3) molding a flange: the flange is extruded within 2s at the molding temperature of 950 ℃;
(4) quenching by waste heat: precooling to 850 ℃, continuously quenching, and quenching into 10% PAG aqueous solution (polyalkylene glycol water-soluble quenching medium), wherein the temperature of the aqueous solution is controlled below 30 ℃;
(5) tempering: specifically, for a 40Cr half shaft: at the temperature of 610-630 ℃, for 3-4 h; for a 42CrMo half shaft: 640-660 ℃ for 3-4 h.
4 automobile half shafts are trial-manufactured according to the traditional process and the process of the invention respectively, and the performance, especially the fatigue performance, is improved through detection and comparison, and the qualification rate is improved from 75% to 100%, as shown in Table 1.
TABLE 1
The above examples are provided to those of ordinary skill in the art to fully disclose and describe how to make and use the claimed embodiments, and are not intended to limit the scope of the disclosure herein. Modifications apparent to those skilled in the art are intended to be within the scope of the appended claims.
Claims (6)
1. The hot processing technology for the automobile half shaft is characterized by comprising the following steps of: the method comprises the following steps:
(1) blanking and induction heating quenching: performing medium-frequency induction quenching on the blank at 900 ℃, performing induction heating for 20s, and refining grains;
(2) induction hot upsetting: performing intermediate frequency induction heating at 1050 ℃, and completing head forming within 30 s;
(3) molding a flange: the flange extrusion is finished within 2s at the temperature of 950 +/-10 ℃ by die pressing;
(4) quenching by waste heat: precooling to 850-860 ℃, continuously quenching, and quenching into a PAG aqueous solution, wherein the temperature of the aqueous solution is controlled below 30 ℃;
(5) and (6) tempering.
2. The hot working process for the automobile half shaft according to claim 1, characterized in that: in the step (3), the molding is performed at a temperature of 950 ℃.
3. The hot working process for the automobile half shaft according to claim 1, characterized in that: and (4) precooling to 850 ℃.
4. The hot working process for the automobile half shaft according to claim 1, characterized in that: in the step (4), the mass concentration of the PAG aqueous solution is 10%.
5. The hot working process for the automobile half shaft according to claim 1, characterized in that: in the step (5), for a 40Cr half shaft: 610-630 ℃ for 3-4 h.
6. The hot working process for the automobile half shaft according to claim 1, characterized in that: in the step (5), for a 42CrMo half shaft: 640-660 ℃ for 3-4 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011618636.4A CN112692221A (en) | 2020-12-31 | 2020-12-31 | Automobile half shaft hot processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011618636.4A CN112692221A (en) | 2020-12-31 | 2020-12-31 | Automobile half shaft hot processing technology |
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| CN112692221A true CN112692221A (en) | 2021-04-23 |
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| CN202011618636.4A Pending CN112692221A (en) | 2020-12-31 | 2020-12-31 | Automobile half shaft hot processing technology |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010057899A (en) * | 1999-12-23 | 2001-07-05 | 이계안 | Manufacturing method of axle shaft for automobile |
| CN104357621A (en) * | 2014-10-22 | 2015-02-18 | 广州市机电工业研究所 | Process method for grain refinement by induction quenching |
| CN105671252A (en) * | 2016-04-01 | 2016-06-15 | 陕西奥邦锻造有限公司 | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle |
| CN207276669U (en) * | 2017-06-22 | 2018-04-27 | 保定华建机械有限公司 | Automobile semifloating axle shaft immediate quenching automatic assembly line |
| CN110328323A (en) * | 2019-08-15 | 2019-10-15 | 吉林大学 | A kind of car rear axle semi-axis forging and forming technology |
-
2020
- 2020-12-31 CN CN202011618636.4A patent/CN112692221A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010057899A (en) * | 1999-12-23 | 2001-07-05 | 이계안 | Manufacturing method of axle shaft for automobile |
| CN104357621A (en) * | 2014-10-22 | 2015-02-18 | 广州市机电工业研究所 | Process method for grain refinement by induction quenching |
| CN105671252A (en) * | 2016-04-01 | 2016-06-15 | 陕西奥邦锻造有限公司 | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle |
| CN207276669U (en) * | 2017-06-22 | 2018-04-27 | 保定华建机械有限公司 | Automobile semifloating axle shaft immediate quenching automatic assembly line |
| CN110328323A (en) * | 2019-08-15 | 2019-10-15 | 吉林大学 | A kind of car rear axle semi-axis forging and forming technology |
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Application publication date: 20210423 |
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