CN111809032A - Preparation method of 14-grade ultrahigh-strength nut - Google Patents
Preparation method of 14-grade ultrahigh-strength nut Download PDFInfo
- Publication number
- CN111809032A CN111809032A CN202010706627.4A CN202010706627A CN111809032A CN 111809032 A CN111809032 A CN 111809032A CN 202010706627 A CN202010706627 A CN 202010706627A CN 111809032 A CN111809032 A CN 111809032A
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- Prior art keywords
- nut
- strength
- ultrahigh
- grade
- heat treatment
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- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 8
- 238000004381 surface treatment Methods 0.000 claims abstract description 3
- 238000005496 tempering Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 229910001339 C alloy Inorganic materials 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 3
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 235000019589 hardness Nutrition 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a preparation method of a 14-grade ultrahigh-strength nut, which adopts alloy steel materials and is prepared by heat treatment and surface treatment, wherein the quenching temperature in the heat treatment process is between 760 and 900 ℃, the heat is preserved for 70 minutes and then the nut is quenched in an oil medium, and then the nut is tempered at the temperature of 450 and 500 ℃ for 100 and 150 minutes. According to the invention, through optimizing key processes such as heat treatment temperature and the like, the ultrahigh-strength nut with the hardness of 38-42HRC (380-420HV) and the stress of 1400MPa (namely 14 level) is ensured on the premise of not increasing the thickness and the size of the nut.
Description
Technical Field
The invention relates to the field of metal materials, in particular to a method for preparing a 14-grade (14T) ultrahigh-strength nut, and relates to an ultrahigh-strength nut.
Background
The highest grade of the existing common nut is 12 grades (namely 1200MPa), and the nut standards such as ISO 898.2, GB/T3098.2, JIS B1052 and the like can be found according to the standard. When the existing nut with the strength is used, if the guaranteed stress of 1400MPa (14 grades or 14T) is required, the specification needs to be increased or the height of the nut needs to be increased, and the specification of a bolt also needs to be increased, so that the cost is increased and the volume of equipment is increased when the nut is used.
Under the premise of not increasing the thickness and the size of the nut, the requirement of strength is required to be met, and the ultrahigh-strength nut is specially developed to meet the use requirement.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preparing an ultrahigh-strength nut with the nut hardness of 38-42HRC and the nut guaranteed stress of 1400 MPa.
In order to solve the technical problem, the invention discloses a preparation method of a 14-grade ultrahigh-strength nut, which comprises the following steps: the alloy steel is adopted, and is prepared by heat treatment and surface treatment.
Further, the heat treatment process of the alloy steel comprises the following steps:
the quenching temperature is 760-900 ℃, the quenching is carried out in an oil medium after the heat preservation is carried out for 70 minutes, and the tempering is carried out at the temperature of 450-500 ℃ for 100-150 minutes.
The surface of the 14-grade ultrahigh-strength nut obtained by the heat treatment is treated to be a zinc-aluminum coating or natural color.
Further, the alloy steel material is preferably medium carbon alloy steel.
The ultrahigh-strength nut is a 1-type nut, the thickness of the nut thread is 0.8D-0.9D, the type of the ultrahigh-strength nut is an all-metal lock nut, a nylon lock nut or a common nut, the hardness of the ultrahigh-strength nut is 38-42HRC, and the nut ensures that the stress reaches 1400 MPa.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through optimizing key processes such as heat treatment temperature and the like, the ultrahigh-strength nut with the hardness of 38-42HRC (380-420HV) and the stress of 1400MPa (namely 14 level) is ensured on the premise of not increasing the thickness and the size of the nut. The treatment process has wide application range and is suitable for all-metal lock nuts, nylon lock nuts or ordinary nuts and the like.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a graphical representation of the force-time curve of the load test of example 1 of the present invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention. Unless otherwise specified, various starting materials of the present invention are commercially available.
Unless defined or indicated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Example 1
A preparation method of a 14-grade ultrahigh-strength nut adopts a medium carbon alloy steel material, and comprises the following steps: the quenching temperature is 760 ℃ and 900 ℃, the quenching is carried out in an oil medium after the heat preservation is carried out for 70 minutes, and the tempering is carried out for 120 minutes at the temperature of 450 ℃ and 500 ℃.
The quenching and tempering temperatures and the quenching and tempering hardnesses of the products in the heat treatment process are shown in the following table:
the product obtained in this example was subjected to a load test as follows (the test force-time curve is shown in fig. 1):
example 2
A method for preparing a 14-grade ultrahigh-strength nut is made of medium carbon alloy steel, and comprises the following steps: the quenching temperature is 760-900 ℃, the temperature is kept for 70 minutes, then the steel is quenched in an oil medium, and then the steel is tempered at 450-500 ℃ for 100 minutes (the temperature of each interval of quenching and tempering in the heat treatment process is shown as example 1).
Example 3
A method for preparing a 14-grade ultrahigh-strength nut is made of medium carbon alloy steel, and comprises the following steps: the quenching temperature is 760-900 ℃, the temperature is kept for 70 minutes, then the steel is quenched in an oil medium, and then the steel is tempered at 450-500 ℃ for 150 minutes (the temperature of each interval of quenching and tempering in the heat treatment process is shown as example 1).
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A preparation method of a 14-grade ultrahigh-strength nut is characterized by comprising the following steps: the 14-grade ultrahigh-strength nut is made of alloy steel and is produced and prepared through heat treatment.
2. The method for preparing a 14-grade ultrahigh-strength nut according to claim 1, wherein the heat treatment process of the alloy steel is as follows:
the quenching temperature is 760-900 ℃, the quenching is carried out in an oil medium after the heat preservation is carried out for 70 minutes, and the tempering is carried out at the temperature of 450-500 ℃ for 100-150 minutes.
3. The method for preparing the ultra-high strength nut with 14 grades according to the claim 2, characterized in that: the surface of the 14-grade ultrahigh-strength nut obtained by the heat treatment is treated to be a zinc-aluminum coating or a natural color.
4. The method for preparing a 14-grade ultrahigh-strength nut according to claim 1, wherein the method comprises the following steps: the alloy steel is medium carbon alloy steel.
5. The method for preparing a 14-grade ultrahigh-strength nut according to claim 1, wherein the method comprises the following steps: the ultrahigh-strength nut is a 1-type nut, and the thickness of the nut thread is 0.8D-0.9D.
6. The method for preparing a 14-grade ultrahigh-strength nut according to claim 1, wherein the method comprises the following steps: the type of the ultrahigh-strength nut is an all-metal locking nut, a nylon locking nut or a common nut.
7. The method for preparing a 14-grade ultrahigh-strength nut according to claim 1, wherein the method comprises the following steps: the hardness of the ultrahigh-strength nut is 38-42HRC, the nut ensures that the stress reaches 1400MPa,
1) obtaining the hardness of 38-42HRC (380-420 HV);
2) the nut of grade 14 (14T) is a 1-type nut, the thickness of the nut thread is 0.8D to 0.9D (namely the 1-type nut), and the type of the nut can be an all-metal locking nut, a nylon locking nut, a common nut and the like;
3) the hardness of the nut is 38-42HRC, the guaranteed stress of the nut is more than 1400MPa, and the nut is produced by adopting alloy steel and quenching and tempering heat treatment. The surface treatment of the nut is usually a zinc-aluminum coating or natural color;
4) the process comprises the following steps: quenching in an oil medium after heat treatment and tempering at the quenching temperature of 860-900 ℃, keeping the temperature for about 70 minutes, and then tempering at the temperature of 450-500 ℃ for about 120 minutes to obtain the hardness of 38-42HRC (380-420HV), wherein the nut ensures the strength (namely 14 grade) of the stress of 1400 MPa;
the connecting piece, including connecting piece body (1), connecting piece body (1) has at least one fixed round hole (3), its characterized in that: the edge outline of stiff end (2) of connecting piece body (1) is arc or semi-circular, the one side processing of stiff end (2) has and encircles annular groove (4) of fixed round hole (3), and the another side of stiff end (2) has and encircles annular tongue (5) of fixed round hole (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706627.4A CN111809032A (en) | 2020-07-21 | 2020-07-21 | Preparation method of 14-grade ultrahigh-strength nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706627.4A CN111809032A (en) | 2020-07-21 | 2020-07-21 | Preparation method of 14-grade ultrahigh-strength nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111809032A true CN111809032A (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010706627.4A Pending CN111809032A (en) | 2020-07-21 | 2020-07-21 | Preparation method of 14-grade ultrahigh-strength nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111809032A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105389A (en) * | 1986-07-31 | 1988-02-24 | 帕特里克·耶尔弗顿·威廉斯 | Self-locking nut |
| CN101797685A (en) * | 2010-04-08 | 2010-08-11 | 浙江裕泰紧固件制造有限公司 | Process for manufacturing high-strength bolt |
| CN102943207A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | High-strength fastener and processing method thereof |
| CN102994707A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process in high-strength nut processing |
| CN103216509A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt and processing method thereof |
| CN105369259A (en) * | 2015-11-18 | 2016-03-02 | 宁波金鹏高强度紧固件有限公司 | Machining method for nut plate |
| CN108526826A (en) * | 2018-04-28 | 2018-09-14 | 鹏驰五金制品有限公司 | A kind of processing technology of high-strength bolt |
| CN108950384A (en) * | 2018-06-29 | 2018-12-07 | 湖南铂固标准件制造有限公司 | A kind of high-strength bolt steel and its application |
-
2020
- 2020-07-21 CN CN202010706627.4A patent/CN111809032A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105389A (en) * | 1986-07-31 | 1988-02-24 | 帕特里克·耶尔弗顿·威廉斯 | Self-locking nut |
| CN101797685A (en) * | 2010-04-08 | 2010-08-11 | 浙江裕泰紧固件制造有限公司 | Process for manufacturing high-strength bolt |
| CN102943207A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | High-strength fastener and processing method thereof |
| CN102994707A (en) * | 2012-11-27 | 2013-03-27 | 宁波腾玲工贸有限公司 | Heat treatment process in high-strength nut processing |
| CN103216509A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt and processing method thereof |
| CN105369259A (en) * | 2015-11-18 | 2016-03-02 | 宁波金鹏高强度紧固件有限公司 | Machining method for nut plate |
| CN108526826A (en) * | 2018-04-28 | 2018-09-14 | 鹏驰五金制品有限公司 | A kind of processing technology of high-strength bolt |
| CN108950384A (en) * | 2018-06-29 | 2018-12-07 | 湖南铂固标准件制造有限公司 | A kind of high-strength bolt steel and its application |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20201023 |