CN109648266B - Rectangular adjusting nut machining process - Google Patents
Rectangular adjusting nut machining process Download PDFInfo
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- CN109648266B CN109648266B CN201811634586.1A CN201811634586A CN109648266B CN 109648266 B CN109648266 B CN 109648266B CN 201811634586 A CN201811634586 A CN 201811634586A CN 109648266 B CN109648266 B CN 109648266B
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- adjusting nut
- round bar
- square
- rolling
- rectangular adjusting
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- 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
Abstract
The invention discloses a processing technology of a rectangular adjusting nut. The adjusting nut processing technology comprises the steps of (1) carrying out solution treatment on a 304 hot-rolled stainless steel round bar; (2) preliminarily forging and rolling the round bar subjected to the solution treatment in the step (1) into a square-like strip close to a final finished product; (3) and (3) drawing the square-like strip obtained in the step (2) to the size of the cross section of the finished nut. The rectangular adjusting nut processing technology designs the technological methods of solution treatment, preliminary forging and rolling and drawing forming, and makes the material structure uniform through solution heat treatment, eliminates the processing stress and improves the comprehensive performance of the material; in order to improve the stability of the drawing process, a square-like strip is firstly obtained by preliminary forging and rolling, the strength is preliminarily improved, and the subsequent fine drawing and forming are facilitated; the drawing process has the advantages that the accurate external dimension is obtained through drawing, the surface smoothness is improved, meanwhile, the better surface quality is obtained, the drawing reduction rate is accurately controlled, and the expected strength and hardness of the product are achieved.
Description
Technical Field
The invention relates to a processing technology of a rectangular adjusting nut.
Background
When a high-speed subway passes through a road section with space limitation such as a tunnel, a rigid contact net electric suspension bracket needs to be designed for reducing the installation space, and the suspension bracket is required to have high strength, high dimensional precision and high service life and reliability due to high speed per hour of the high-speed subway design. For example, the tensile strength of a product is required to reach 820MPa by a rectangular adjusting nut used in the construction process of an electric suspension bracket of a rigid contact network. At present, the method for processing the rectangular adjusting nut is to perform tapping and drilling after conventional machining such as turning on a 304 stainless steel round bar, and the 304 stainless steel cannot be subjected to heat treatment to improve the strength, so that the rectangular adjusting nut meeting the size requirement can be produced by the method, but the strength is only 650MPa at most, the requirement cannot be met, the production efficiency is particularly low, and the size consistency is poor. Accordingly, the present invention is directed to a rectangular adjusting nut processing technique to solve the above problems.
Disclosure of Invention
The invention provides a processing technology of a rectangular adjusting nut, which has high production efficiency and meets the requirement of product strength, and solves the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a processing technology of a rectangular adjusting nut comprises the following steps:
(1) carrying out solution treatment on a 304 hot-rolled stainless steel round bar to enable the material structure to be uniform;
(2) preliminarily forging and rolling the round bar subjected to the solution treatment in the step (1) into a square-like strip close to a final finished product;
(3) drawing the quasi-square strip obtained in the step (2) to the size of the cross section of the finished nut;
(4) and sawing, tapping and punching according to the length requirement to obtain the finished product rectangular adjusting nut.
Preferably, the specific method of the solution treatment in the step (1) is as follows: heating to 520 ℃ for 3.2-3.4 hours, heating to 880 ℃ for 2.2-2.4 hours, heating to 1150 ℃ for 1.8-2.2 hours, and cooling to room temperature.
Preferably, the calculation formula of the total reduction ratio from the stainless steel round bar to the finished nut is as follows:
preferably, the forging temperature in the step (2) is 880-920 ℃.
Preferably, the reduction ratio of the forging and rolling process in the step (2) is 60-64%.
Preferably, the reduction ratio in the drawing step in the step (3) is 14 to 18%.
The wire-drawing die used in the drawing in the step (3) comprises an inlet area, a reducing area, a sizing band and an outlet area, wherein,
the inlet area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 22-27mm, and the cone angle is 58-62 degrees;
the diameter reducing area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 18-22mm, and the cone angle is 20-24 degrees;
the section shape of the sizing belt is the shape of a finished nut;
the outlet area is in a horn shape formed by four planes, the diameter of the front end is smaller than that of the rear end, the length is 23-27mm, and the cone angle is 28-32 degrees;
the four planes of the inlet area, the reducing area, the sizing belt and the outlet area are sequentially connected with each other.
Preferably, the front and rear ends of the die are each provided with a chamfer.
The invention adopts the structure and has the following advantages:
in order to ensure the dimensional precision, the corrosion resistance and the uniform and flawless structure performance of the product, the process methods of solution treatment, preliminary forging and rolling and drawing forming are designed, the material structure is uniform through solution heat treatment, the processing stress is eliminated, and the comprehensive performance of the material is improved; in order to improve the stability of the drawing process, a square-like strip is firstly obtained by preliminary forging and rolling, the strength is preliminarily improved, and the subsequent fine drawing and forming are facilitated; the drawing process has the advantages that the accurate external dimension is obtained through drawing, the surface smoothness is improved, meanwhile, the better surface quality is obtained, the drawing reduction rate is accurately controlled, and the expected strength and hardness of the product are achieved.
Drawings
FIG. 1 is a schematic cross-sectional view of a rectangular adjusting nut of the present invention;
FIG. 2 is a schematic cross-sectional view of a 304 hot rolled stainless steel round bar according to the present invention;
FIG. 3 is a schematic cross-sectional view of a square-like strip produced by the preliminary forging and rolling of the present invention;
FIG. 4 is a schematic side view of the rectangular adjusting nut of the present invention;
FIG. 5 is a schematic view of the drawing die of the present invention.
In the figure, 1, an inlet zone, 2, a reducing zone, 3, a bearing zone, 4 and an outlet zone.
The specific implementation mode is as follows:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
The work hardening coefficient of the 304 stainless steel round bar is about 1.2, and the total reduction ratio of the stainless steel round bar to the finished nut is as follows:
in the present embodiment, the cross section of the rectangular adjusting nut to be obtained is (30 ± 0.02) mm × (35 ± 0.02) mm, the cross section of the raw material 304 stainless steel round bar is 65mm, and the rectangular adjusting nut is processed until the total reduction rate of the finished rectangular nut is about 16%.
As shown in fig. 1 to 5, the rectangular adjusting nut processing technology of the present embodiment includes the following steps:
(1) the method is characterized in that a 304 hot-rolled stainless steel round bar is subjected to solution treatment to make the material structure uniform, and the specific method of the solution treatment comprises the following steps: heating to 520 ℃ for 3.2-3.4 hours, heating to 880 ℃ for 2.2-2.4 hours, heating to 1150 ℃ for 1.8-2.2 hours, and cooling to room temperature;
(2) preliminarily forging and rolling the round bar subjected to the solution treatment in the step (1) into a square-like strip close to a final finished product, wherein the forging and rolling temperature is 880 and 920 ℃, and the reduction rate of the forging and rolling process is about 62%;
(3) drawing the quasi-square strip obtained in the step (2) to the size of the cross section of the finished nut, wherein the surface reduction rate of the drawing process is about 16% compared with the quasi-square strip;
(4) and sawing, tapping and punching according to the length requirement to obtain the finished product rectangular adjusting nut.
The wire-drawing die used in the drawing in the step (3) comprises an inlet area, a reducing area, a sizing band and an outlet area, wherein,
the inlet area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 25mm, and the cone angle is 60 degrees;
the diameter reducing area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 20mm, and the cone angle is 22 degrees;
the section shape of the sizing belt is the shape of a finished nut;
the outlet area is in a horn shape formed by four planes, the diameter of the front end is smaller than that of the rear end, the length is 25mm, and the cone angle is 30 degrees;
the four planes of the inlet area, the reducing area, the sizing belt and the outlet area are sequentially connected with each other.
Preferably, the front and rear ends of the die are each provided with a chamfer.
The rectangular adjusting nut product has the advantages of high corrosion resistance, high surface smoothness, high overall dimension precision, uniform and consistent structure performance and no defect after penetrant inspection, ultrasonic inspection, visual inspection and dimension inspection, and all performance parameters completely meet the requirements. Specifically, the tensile strength reaches 820MPa, the surface finish reaches Ra1.6-Ra0.8, the thread guarantee stress is above 800, and the grain size is improved by about 4 grades.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (3)
1. A rectangular adjusting nut processing technology is characterized in that: the method comprises the following steps:
(1) carrying out solution treatment on a 304 hot-rolled stainless steel round bar to enable the material structure to be uniform; the specific method of the solution treatment comprises the following steps: heating to 520 ℃ for 3.2-3.4 hours, heating to 880 ℃ for 2.2-2.4 hours, heating to 1150 ℃ for 1.8-2.2 hours, and cooling to room temperature;
(2) preliminarily forging and rolling the round bar subjected to the solution treatment in the step (1) into a square-like strip close to a final finished product, wherein the reduction ratio of the forging and rolling process to the round bar is set to be 60-64%; the forging and rolling temperature is 880-920 ℃;
(3) drawing the square-like strip obtained in the step (2) to the size of the cross section of the finished nut, wherein the reduction rate of the drawing process is 14-18%, so that the tensile strength of the square-like strip reaches 820 Mpa;
the drawing die used in drawing comprises an entry zone, a reducing zone, a bearing band and an exit zone, wherein,
the inlet area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 22-27mm, and the cone angle is 58-62 degrees;
the diameter reducing area is in a horn shape formed by four planes, the diameter of the front end is larger than that of the rear end, the length is 18-22mm, and the cone angle is 20-24 degrees;
the section shape of the sizing belt is the shape of a finished nut;
the outlet area is in a horn shape formed by four planes, the diameter of the front end is smaller than that of the rear end, the length is 23-27mm, and the cone angle is 28-32 degrees;
the four planes of the inlet area, the reducing area, the sizing belt and the outlet area are sequentially connected with each other;
(4) and sawing, tapping and punching according to the length requirement to obtain the finished product rectangular adjusting nut.
2. The rectangular adjusting nut machining process according to claim 1, characterized in that: the calculation formula of the total reduction ratio from the stainless steel round bar to the finished nut is as follows:
3. the rectangular adjusting nut machining process according to claim 1, characterized in that: the front end and the rear end of the wire-drawing die are respectively provided with a chamfer.
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|---|---|---|---|
| CN201811634586.1A CN109648266B (en) | 2018-12-29 | 2018-12-29 | Rectangular adjusting nut machining process |
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| CN201811634586.1A CN109648266B (en) | 2018-12-29 | 2018-12-29 | Rectangular adjusting nut machining process |
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| CN109648266B true CN109648266B (en) | 2022-02-08 |
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| CN110666459A (en) * | 2019-09-27 | 2020-01-10 | 宁波双林汽车部件股份有限公司 | Efficient manufacturing method of automobile electric seat nut |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377360A (en) * | 1980-05-05 | 1983-03-22 | Wire Products Company, Inc. | Channel nut and method of making same |
| CN202447407U (en) * | 2012-02-27 | 2012-09-26 | 上海奉贤钢管厂 | Mould special for cold-drawing steel pipe |
| CN104785706A (en) * | 2014-11-05 | 2015-07-22 | 连云港珍珠河石化管件有限公司 | Die forging forming machining method for high-neck flange |
| CN104907770A (en) * | 2015-05-29 | 2015-09-16 | 海盐宇星螺帽有限责任公司 | Processing process of tetragonal nut |
| CN105543540A (en) * | 2015-12-26 | 2016-05-04 | 汕头华兴冶金设备股份有限公司 | Copper chromium zirconium alloy and preparing method thereof |
| CN106086680A (en) * | 2016-08-16 | 2016-11-09 | 宁波瑞国精机工业有限公司 | A kind of high strength nut and processing method thereof |
| CN106938285A (en) * | 2017-04-28 | 2017-07-11 | 山西太钢不锈钢股份有限公司 | A kind of manufacture method of stainless steel square tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746924B (en) * | 2017-11-01 | 2019-05-14 | 山东伊莱特重工股份有限公司 | A kind of method of large size austenitic stainless steel ring forging heat treatment deformation |
| CN108342556B (en) * | 2018-02-14 | 2020-05-01 | 福建东亚机械有限公司 | High-alloy wire forming processing technology for piston ring |
-
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- 2018-12-29 CN CN201811634586.1A patent/CN109648266B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377360A (en) * | 1980-05-05 | 1983-03-22 | Wire Products Company, Inc. | Channel nut and method of making same |
| CN202447407U (en) * | 2012-02-27 | 2012-09-26 | 上海奉贤钢管厂 | Mould special for cold-drawing steel pipe |
| CN104785706A (en) * | 2014-11-05 | 2015-07-22 | 连云港珍珠河石化管件有限公司 | Die forging forming machining method for high-neck flange |
| CN104907770A (en) * | 2015-05-29 | 2015-09-16 | 海盐宇星螺帽有限责任公司 | Processing process of tetragonal nut |
| CN105543540A (en) * | 2015-12-26 | 2016-05-04 | 汕头华兴冶金设备股份有限公司 | Copper chromium zirconium alloy and preparing method thereof |
| CN106086680A (en) * | 2016-08-16 | 2016-11-09 | 宁波瑞国精机工业有限公司 | A kind of high strength nut and processing method thereof |
| CN106938285A (en) * | 2017-04-28 | 2017-07-11 | 山西太钢不锈钢股份有限公司 | A kind of manufacture method of stainless steel square tube |
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Denomination of invention: A Processing Technology of Rectangle Adjusting Nut Effective date of registration: 20221209 Granted publication date: 20220208 Pledgee: Shandong Tengzhou Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG TENDA FASTEN TECHNOLOGY CO.,LTD. Registration number: Y2022980025691 |
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