CN104178618A - Heat treatment method favorable for quality of screw - Google Patents
Heat treatment method favorable for quality of screw Download PDFInfo
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- CN104178618A CN104178618A CN201410402748.4A CN201410402748A CN104178618A CN 104178618 A CN104178618 A CN 104178618A CN 201410402748 A CN201410402748 A CN 201410402748A CN 104178618 A CN104178618 A CN 104178618A
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Abstract
The invention discloses a heat treatment method favorable for the quality of a screw, and the method is used for carrying out heat treatment on an automobile screw made of No.30 steel. The method comprises a quenching step and a tempering step which are successively carried out, wherein the quenching step comprises a heating process, a heat preservation process and a shock cooling process which are successively carried out on the to-be-treated automobile screw, wherein the heating process is carried out in steps of heating the automobile screw at a normal temperature to 810 DEG C to 820 DEG C, performing heat preservation on the automobile screw for 8 to 10 minutes, then treating the automobile screw in a salt bath to 760 DEG C to 780 DEG C and carrying out the heat preservation for 3 to 4 minutes under the condition that the time from the temperature of the automobile screw staying at 650 DEG C to an upper temperature limit is not more than 20 minutes and the heating rate is not greater than 2 DEG C per second during the heating process; the shock cooling process is carried out by performing the shock cooling on the automobile screw by virtue of saline water. According to the heat treatment process, after the heat treatment on the existing automobile screw made of No.35 steel is carried out, the surface hardness of the automobile screw can reach HRC25-27, and the good structure and hardness uniformity of the automobile screw is achieved at the same time. Thus, the automobile screw is crackless.
Description
Technical field
The present invention relates to screw thermal treatment process field, particularly relate to a kind of heat treating method that is conducive to screw quality.
Background technology
Screw is web member indispensable in automotive industry, is widely used the screw that a kind of physical dimension is standardized component on automobile, and its material is 35# steel, and hardness requirement value is HRC24-29, uses maximum M6 of being of a size of, M8 and M10.
Owing to applying on automobile with screwing, its quality directly affects by bus personnel's life safety, and in process of production, its specification of quality is very high, and specification of quality wherein mainly comprises to be organized uniformity of hardness, whether have crackle etc.In prior art, applying to thermal treatment process with screwing is generally and adopts 820-840 ℃ of insulation to be no less than quenching in 10 minutes, then carry out 500-550 ℃ of insulation and be no less than 4h tempering, yet the product that existing thermal treatment process obtains occurs that the possibility of cracking defect is larger, while is due to the limitation of size of screw itself, occur that undetected possibility is also larger, so a set of solid thermal treatment process is the key that guarantees automobile screw quality.
Summary of the invention
The possibility that occurs cracking defect for the product that in above-mentioned prior art, existing thermal treatment process obtains is larger, a set of solid thermal treatment process is the crucial problem that guarantees automobile screw quality, the invention provides a kind of heat treating method that is conducive to screw quality.
For the problems referred to above, a kind of heat treating method that is conducive to screw quality provided by the invention reaches goal of the invention by following technical essential: a kind of heat treating method that is conducive to screw quality, for the automobile screw that is 30# steel to material, heat-treat, comprise quench in sequence step and tempering step, described quenching step comprises the heating process that pending automobile screw is carried out successively, insulation operation and quenching operation, described heating process is for to be heated to 810-820 ℃ by the automobile screw of normal temperature, after insulation 8-10min, salt bath is to 760-780 ℃ and be incubated 3-4min, and automobile screw temperature rests on 650 ℃ to the sands are running out between upper temperature limit in 20min, and temperature-rise period temperature rise rate is not more than 2 ℃/s,
Described cooling process is cooling for adopting salt solution to carry out quenching to automobile screw.
In above operation, being limited with of temperature rise rate in heating process is beneficial to the severe degree that slows down the accumulation of automobile screw built-in thermal stress, automobile screw temperature is beneficial to the thickness that reduces screw Decarburized layer in being limited with of more than 650 ℃ time, be beneficial to the oeverall quality of automobile screw, to the restriction of soaking time and heat-eliminating medium, make screw there is good tissue, uniformity of hardness.
Adopt salt bath the automobile bolt in upper temperature limit to be carried out to cooling cooling efficiency is high for the first time, the heat treatment efficiency that is conducive to automobile bolt, simultaneously, after adopting the temperature of 810-820 ℃ to make automobile bolt organize complete austenitizing, be cooled to the incubation step in subordinate phase, the temperature that during final salt solution quenching, the initial temperature of automobile screw is subordinate phase, because austenitizing in the low and screw of quenching initial temperature is complete, make the screw flawless situation generation having obtained after having quenched.
Further technical scheme is:
For further optimizing quenching quality, be lifted at the cleaning capacity that in quench process, cooling fluid changes into automobile screw Surface Oxygen, described salt solution is that concentration is the sodium chloride solution of 7-10%.
For further optimizing quenching quality, make the various piece of each screw in automobile screw is produced by batch all can obtain uniform speed of cooling, improve the surface cleaning quality of automobile screw in quenching operation, in quenching step, go back agitating procedure, described agitating procedure is synchronizeed and is carried out with cooling process, agitating procedure, for stirring at least one in automobile screw and salt solution, makes automobile screw and salt solution generation relative movement in cooling process.
The present invention has following beneficial effect:
1, this operational path is simple, being limited with of temperature rise rate in heating process is beneficial to the severe degree that slows down the accumulation of automobile screw built-in thermal stress, automobile screw temperature is beneficial to the thickness that reduces screw Decarburized layer in being limited with of more than 650 ℃ time, be beneficial to the oeverall quality of automobile screw, to the restriction of soaking time and heat-eliminating medium, make screw there is good tissue, uniformity of hardness.The restriction of above thermal treatment process route and processing parameter, makes existing 35# steel automobile screw can reach HRC25-27 through Overheating Treatment rear surface hardness, simultaneously microstructure and hardness good uniformity.
2, adopt salt bath the automobile bolt in upper temperature limit to be carried out to cooling cooling efficiency is high for the first time, the heat treatment efficiency that is conducive to automobile bolt, simultaneously, after adopting the temperature of 810-820 ℃ to make automobile bolt organize complete austenitizing, be cooled to the incubation step in subordinate phase, the temperature that during final salt solution quenching, the initial temperature of automobile screw is subordinate phase, because austenitizing in the low and screw of quenching initial temperature is complete, make the screw flawless situation generation having obtained after having quenched.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
A kind of heat treating method that is conducive to screw quality, for the automobile screw that is 30# steel to material, heat-treat, comprise quench in sequence step and tempering step, described quenching step comprises the heating process that pending automobile screw is carried out successively, insulation operation and quenching operation, described heating process is for to be heated to 810-820 ℃ by the automobile screw of normal temperature, after insulation 8-10min, salt bath is to 760-780 ℃ and be incubated 3-4min, and automobile screw temperature rests on 650 ℃ to the sands are running out between upper temperature limit in 20min, and temperature-rise period temperature rise rate is not more than 2 ℃/s,
Described cooling process is cooling for adopting salt solution to carry out quenching to automobile screw.
In above operation, being limited with of temperature rise rate in heating process is beneficial to the severe degree that slows down the accumulation of automobile screw built-in thermal stress, automobile screw temperature is beneficial to the thickness that reduces screw Decarburized layer in being limited with of more than 650 ℃ time, be beneficial to the oeverall quality of automobile screw, to the restriction of soaking time and heat-eliminating medium, make screw there is good tissue, uniformity of hardness.
Adopt salt bath the automobile bolt in upper temperature limit to be carried out to cooling cooling efficiency is high for the first time, the heat treatment efficiency that is conducive to automobile bolt, simultaneously, after adopting the temperature of 810-820 ℃ to make automobile bolt organize complete austenitizing, be cooled to the incubation step in subordinate phase, the temperature that during final salt solution quenching, the initial temperature of automobile screw is subordinate phase, because austenitizing in the low and screw of quenching initial temperature is complete, make the screw flawless situation generation having obtained after having quenched.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1: for further optimizing quenching quality, be lifted at the cleaning capacity that in quench process, cooling fluid changes into automobile screw Surface Oxygen, described salt solution is that concentration is the sodium chloride solution of 7-10%.
For further optimizing quenching quality, make the various piece of each screw in automobile screw is produced by batch all can obtain uniform speed of cooling, improve the surface cleaning quality of automobile screw in quenching operation, in quenching step, go back agitating procedure, described agitating procedure is synchronizeed and is carried out with cooling process, agitating procedure, for stirring at least one in automobile screw and salt solution, makes automobile screw and salt solution generation relative movement in cooling process.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (3)
1. a heat treating method that is conducive to screw quality, for the automobile screw that is 30# steel to material, heat-treat, comprise quench in sequence step and tempering step, it is characterized in that, described quenching step comprises the heating process that pending automobile screw is carried out successively, insulation operation and quenching operation, described heating process is for to be heated to 810-820 ℃ by the automobile screw of normal temperature, after insulation 8-10min, salt bath is to 760-780 ℃ and be incubated 3-4min, and automobile screw temperature rests on 650 ℃ to the sands are running out between upper temperature limit in 20min, and temperature-rise period temperature rise rate is not more than 2 ℃/s,
Described cooling process is cooling for adopting salt solution to carry out quenching to automobile screw.
2. a kind of heat treating method that is conducive to screw quality according to claim 1, is characterized in that, described salt solution is that concentration is the sodium chloride solution of 7-10%.
3. a kind of heat treating method that is conducive to screw quality according to claim 1, it is characterized in that, in quenching step, go back agitating procedure, described agitating procedure is synchronizeed and is carried out with cooling process, agitating procedure, for stirring at least one in automobile screw and salt solution, makes automobile screw and salt solution generation relative movement in cooling process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402748.4A CN104178618A (en) | 2014-08-17 | 2014-08-17 | Heat treatment method favorable for quality of screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402748.4A CN104178618A (en) | 2014-08-17 | 2014-08-17 | Heat treatment method favorable for quality of screw |
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| CN104178618A true CN104178618A (en) | 2014-12-03 |
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| CN201410402748.4A Pending CN104178618A (en) | 2014-08-17 | 2014-08-17 | Heat treatment method favorable for quality of screw |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108890223A (en) * | 2018-06-28 | 2018-11-27 | 浙江俊荣五金工业有限公司 | Locking double section silk screw production technologies |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733946A (en) * | 2005-07-29 | 2006-02-15 | 上海汽轮机有限公司 | Subcritical steam turbine bolting steel fine grain processing method |
| WO2012165729A1 (en) * | 2011-06-02 | 2012-12-06 | 삼화강봉 주식회사 | High-strength steel wire having improved mold life for cold forming and method for manufacturing same |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
| JP2013104070A (en) * | 2011-11-10 | 2013-05-30 | Nippon Steel & Sumitomo Metal Corp | High-strength steel excellent in delayed breakage resistance, and high-strength bolt |
-
2014
- 2014-08-17 CN CN201410402748.4A patent/CN104178618A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733946A (en) * | 2005-07-29 | 2006-02-15 | 上海汽轮机有限公司 | Subcritical steam turbine bolting steel fine grain processing method |
| WO2012165729A1 (en) * | 2011-06-02 | 2012-12-06 | 삼화강봉 주식회사 | High-strength steel wire having improved mold life for cold forming and method for manufacturing same |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| JP2013104070A (en) * | 2011-11-10 | 2013-05-30 | Nippon Steel & Sumitomo Metal Corp | High-strength steel excellent in delayed breakage resistance, and high-strength bolt |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
Non-Patent Citations (1)
| Title |
|---|
| 郑朝霞 等: "35钢汽车标准件螺钉热处理工艺的改进", 《现代制造工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108890223A (en) * | 2018-06-28 | 2018-11-27 | 浙江俊荣五金工业有限公司 | Locking double section silk screw production technologies |
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Application publication date: 20141203 |