CN107586935A - The heat treatment method of screw - Google Patents
The heat treatment method of screw Download PDFInfo
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- CN107586935A CN107586935A CN201711036992.3A CN201711036992A CN107586935A CN 107586935 A CN107586935 A CN 107586935A CN 201711036992 A CN201711036992 A CN 201711036992A CN 107586935 A CN107586935 A CN 107586935A
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Abstract
The present invention relates to a kind of heat treatment method of fastener, and in particular to the heat treatment method of screw, belongs to the preparing technical field of alloy material.Present invention solves the technical problem that being to provide a kind of heat treatment method of screw, this method includes the following steps carried out successively：A, the screw after machining is warming up to 800~1000 DEG C, is incubated 20~30min；B, accelerate to be cooled to 600~750 DEG C with 1~3 DEG C/s cooling velocity；Cooling velocity is increased into 0.5~1.5 DEG C/s again, is cooled to less than 400 DEG C；C, it is air-cooled to room temperature；D, screw is tempered, the temperature of temper is 200~240 DEG C, and tempering time is 60~80min.The constituent and content of screw of the present invention are reasonable in design, there is the surface of hard wear resistant and tough and tensile center portion after heat treatment method processing by the present invention, there is preferable tensile strength and yield strength, better mechanical property, hardness is high, substantially prolongs service life.In addition, the inventive method is simple, cost is low, it is easy to accomplish.
Description
Technical field
The present invention relates to a kind of heat treatment method of fastener, and in particular to the heat treatment method of screw, belongs to alloy material
The preparing technical field of material.
Background technology
Fastener, it is to be fastenedly connected with and apply extremely wide a kind of machine components.Fastener, it is wide using industry
It is general, including the energy, electronics, electrical equipment, machinery, chemical industry, metallurgy, mould, hydraulic pressure etc. industry, various machineries, equipment, vehicle,
Above ship, railway, bridge, building, structure, instrument, instrument, chemical industry, instrument and articles for use etc., it can be seen that miscellaneous
Fastener, it is most widely used mechanical basic part.Its feature is that description is various, and performance purposes is different, and standard
Change, seriation, unitized degree are also high.Therefore, also that a kind of fastener of obtained official standard called standard is tight by someone
Firmware, or referred to as standard component.
Screw, it is a kind of common fastener of in the market.It is a kind of fastener being made up of head and screw rod two parts,
It can be divided into, according to use, three classes：Machine screw, holding screw and specific use screw.Machine screw is mainly used in a clamp screw
Being fastenedly connected between the part of pit, with a part with through hole, it is not necessary to which (this type of attachment is referred to as nut cooperation
Mode connects for screw, fall within and be detachably connected；It can also coordinate with nut, connect for the fastening between two parts with through hole
Connect.) holding screw is mainly used in the relative position fixed between two parts.Specific use screw supplies such as having lifting bolt
Part is lifted to use.
Existing screw mostly uses bulk metal structure, still suffers from some problems, as weight is big, materials cost is high, resistance to
Mill property, hardness, rustless property, decay resistance, high and low temperature resistance, fragility, toughness etc. are general, can not meet in many occasions
The needs of production, also need further to improve, to improve production efficiency, reduce cost, improve security, extend the use of screw
Life-span.
The content of the invention
For disadvantages described above, present invention solves the technical problem that being to provide a kind of heat treatment method of screw, at this method
Screw intensity after reason is high, service life length.
The heat treatment method of screw of the present invention, including the following steps carried out successively：
A, the screw after machining is warming up to 800~1000 DEG C, is incubated 20~30min；
B, accelerate to be cooled to 600~750 DEG C with 1~3 DEG C/s cooling velocity；Cooling velocity is increased by 0.5~1.5 again
DEG C/s, it is cooled to less than 400 DEG C；
C, it is air-cooled to room temperature；
D, screw is tempered, the temperature of temper is 200~240 DEG C, and tempering time is 60~80min.
Preferably, the acceleration cooling of b step is carried out by applying cooling medium.
It is further preferred that the cooling medium is compressed air or gas-vapor mix.
Preferably, the screw consists of the following components in percentage by weight：C：0.18%~0.25%, Si：0.2~
0.25%, Mn：1.14~1.82%；Cr：1.40~1.52%；Ti：0.13~0.51%, Ni：0.05~0.08%, P≤
0.02%, S≤0.02%, O≤0.02%, remaining is Fe and inevitable impurity.
It is further preferred that the screw consists of the following components in percentage by weight：C：0.21%~0.24%, Si：
0.21~0.23%, Mn：1.42~1.53%；Cr：1.42~1.48%；Ti：0.25~0.41%, Ni：0.06~0.07%,
P≤0.02%, S≤0.02%, O≤0.02%, remaining is Fe and inevitable impurity.
Compared with prior art, the present invention has the advantages that：
The constituent and content of screw of the present invention are reasonable in design, have heavily fortified point after the heat treatment method processing by the present invention
Hard wear-resisting surface and tough and tensile center portion, have preferable tensile strength and yield strength, better mechanical property, hardness
Height, it substantially prolongs service life.In addition, the inventive method is simple, cost is low, it is easy to accomplish.
Embodiment
The heat treatment method of screw of the present invention, including the following steps carried out successively：
A, the screw after machining is warming up to 800~1000 DEG C, is incubated 20~30min；
B, accelerate to be cooled to 600~750 DEG C with 1~3 DEG C/s cooling velocity；Cooling velocity is increased by 0.5~1.5 again
DEG C/s, it is cooled to less than 400 DEG C；
C, it is air-cooled to room temperature；
D, screw is tempered, the temperature of temper is 200~240 DEG C, and tempering time is 60~80min.
Preferably, the acceleration cooling of b step is carried out by applying cooling medium.
The present invention only requires to cooling velocity, to cooling medium without limiting, as long as can reach corresponding cooling velocity
, for example, the cooling medium can be compressed air or gas-vapor mix.
The method of the present invention, can be prepared screw, in order to improve the hardness of screw and use using common iron
Life-span, it is preferred that the screw consists of the following components in percentage by weight：C：0.18%~0.25%, Si：0.2~
0.25%, Mn：1.14~1.82%；Cr：1.40~1.52%；Ti：0.13~0.51%, Ni：0.05~0.08%, P≤
0.02%, S≤0.02%, O≤0.02%, remaining is Fe and inevitable impurity.
It is further preferred that the screw consists of the following components in percentage by weight：C：0.21%~0.24%, Si：
0.21~0.23%, Mn：1.42~1.53%；Cr：1.42~1.48%；Ti：0.25~0.41%, Ni：0.06~0.07%,
P≤0.02%, S≤0.02%, O≤0.02%, remaining is Fe and inevitable impurity.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1
Screw is produced as follows：
A, design steel product ingredient consists of the following components in percentage by weight：C：0.21%, Si：0.23%, Mn：
1.53%；Cr：1.42%；Ti：0.41%, Ni：0.06%, P≤0.02%, S≤0.02%, O≤0.02%, remaining be Fe and
Inevitable impurity.
B, it is heat-treated after steel are machined, obtains screw blank, wherein, described heat treatment method is：Will
Screw after machining is warming up to 800 DEG C, is incubated 30min, then accelerates to be cooled to 600 DEG C with 3 DEG C/s cooling velocity；Again
Accelerate to be cooled to 4 DEG C/s cooling velocity to be cooled to less than 400 DEG C, be air-cooled to room temperature；Screw is tempered again, at tempering
The temperature of reason is 200 DEG C, tempering time 80min；
C, the screw after heat treatment is subjected to degreasing and rust removal, Passivation Treatment, you can screw finished product is made.
After tested, the tensile strength of the screw is 1445MPa, and yield strength 1004MPa, HRC hardness are 48.
Embodiment 2
Screw is produced as follows：
A, design steel product ingredient consists of the following components in percentage by weight：C：0.24%, Si：0.21%, Mn：
1.42%；Cr：1.48%；Ti：0.25%, Ni：0.07%, P≤0.02%, S≤0.02%, O≤0.02%, remaining be Fe and
Inevitable impurity.
B, it is heat-treated after steel are machined, obtains screw blank, wherein, described heat treatment method is：Will
Screw after machining is warming up to 1000 DEG C, is incubated 20min, then accelerates to be cooled to 750 DEG C with 1 DEG C/s cooling velocity；
Accelerate to be cooled to 2.5 DEG C/s cooling velocity again to be cooled to less than 400 DEG C, be air-cooled to room temperature；Screw is tempered again, returned
The temperature of fire processing is 240 DEG C, tempering time 60min；
C, the screw after heat treatment is subjected to degreasing and rust removal, Passivation Treatment, you can screw finished product is made.
After tested, the tensile strength of the screw is 1439MPa, and yield strength 1001MPa, HRC hardness are 47.
Embodiment 3
Screw is produced as follows：
A, design steel product ingredient consists of the following components in percentage by weight：C：0.23%, Si：0.22%, Mn：
1.48%；Cr：1.45%；Ti：0.32%, Ni：0.06%, P≤0.02%, S≤0.02%, O≤0.02%, remaining be Fe and
Inevitable impurity.
B, it is heat-treated after steel are machined, obtains screw blank, wherein, described heat treatment method is：Will
Screw after machining is warming up to 900 DEG C, is incubated 25min, then accelerates to be cooled to 700 DEG C with 2 DEG C/s cooling velocity；Again
Accelerate to be cooled to 3 DEG C/s cooling velocity to be cooled to less than 400 DEG C, be air-cooled to room temperature；Screw is tempered again, at tempering
The temperature of reason is 200 DEG C, tempering time 70min；
C, the screw after heat treatment is subjected to degreasing and rust removal, Passivation Treatment, you can screw finished product is made.
After tested, the tensile strength of the screw is 1457MPa, and yield strength 1009MPa, HRC hardness are 50.
Claims (5)
1. the heat treatment method of screw, it is characterised in that including the following steps carried out successively：
A, the screw after machining is warming up to 800~1000 DEG C, is incubated 20~30min；
B, accelerate to be cooled to 600~750 DEG C with 1~3 DEG C/s cooling velocity；Cooling velocity is increased into 0.5~1.5 DEG C/s again,
It is cooled to less than 400 DEG C；
C, it is air-cooled to room temperature；
D, screw is tempered, the temperature of temper is 200~240 DEG C, and tempering time is 60~80min.
2. the heat treatment method of screw according to claim 1, it is characterised in that：The acceleration cooling of b step is by applying
Add cooling medium to carry out.
3. the heat treatment method of screw according to claim 2, it is characterised in that：The cooling medium be compressed air or
Gas-vapor mix.
4. the heat treatment method of the screw according to any one of claims 1 to 3, it is characterised in that：The screw is by following
The component composition of percentage by weight：C：0.18%~0.25%, Si：0.2~0.25%, Mn：1.14~1.82%；Cr：1.40
~1.52%；Ti：0.13~0.51%, Ni：0.05~0.08%, P≤0.02%, S≤0.02%, O≤0.02%, remaining is
Fe and inevitable impurity.
5. the heat treatment method of screw according to claim 4, it is characterised in that：The screw is by following percentage by weight
Component composition：C：0.21%~0.24%, Si：0.21~0.23%, Mn：1.42~1.53%；Cr：1.42~1.48%；
Ti：0.25~0.41%, Ni：0.06~0.07%, P≤0.02%, S≤0.02%, O≤0.02%, remaining is Fe and can not
The impurity avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711036992.3A CN107586935A (en) | 2017-10-30 | 2017-10-30 | The heat treatment method of screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711036992.3A CN107586935A (en) | 2017-10-30 | 2017-10-30 | The heat treatment method of screw |
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| Publication Number | Publication Date |
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| CN107586935A true CN107586935A (en) | 2018-01-16 |
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| CN201711036992.3A Pending CN107586935A (en) | 2017-10-30 | 2017-10-30 | The heat treatment method of screw |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
| CN103084525A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining connection rod bolt of diesel engine |
| CN103212957A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt processing method |
| CN104164541A (en) * | 2014-08-17 | 2014-11-26 | 成都亨通兆业精密机械有限公司 | Heat treatment method beneficial to core tenacity of auto screw |
| CN105369156A (en) * | 2015-11-18 | 2016-03-02 | 宁波瑞尔汽车零部件有限公司 | Manufacturing method of screw |
-
2017
- 2017-10-30 CN CN201711036992.3A patent/CN107586935A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
| CN102995029A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process of bolt processing |
| CN103084525A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining connection rod bolt of diesel engine |
| CN103212957A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt processing method |
| CN104164541A (en) * | 2014-08-17 | 2014-11-26 | 成都亨通兆业精密机械有限公司 | Heat treatment method beneficial to core tenacity of auto screw |
| CN105369156A (en) * | 2015-11-18 | 2016-03-02 | 宁波瑞尔汽车零部件有限公司 | Manufacturing method of screw |
Non-Patent Citations (1)
| Title |
|---|
| 董加坤: ""空调螺钉热处理工艺的特点"", 《理化检验-物理分册》 * |
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Application publication date: 20180116 |