CN114774638A - Thread surface quenching method for steel part made of high-nickel alloy structural steel - Google Patents
Thread surface quenching method for steel part made of high-nickel alloy structural steel Download PDFInfo
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- CN114774638A CN114774638A CN202210421180.5A CN202210421180A CN114774638A CN 114774638 A CN114774638 A CN 114774638A CN 202210421180 A CN202210421180 A CN 202210421180A CN 114774638 A CN114774638 A CN 114774638A
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- quenching
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- nickel alloy
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- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
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- 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
Abstract
The invention relates to a thread surface quenching method for making high nickel alloy structural steel as a steel part, which can make the thread surface of the high nickel alloy structural steel as a steel part and meet the surface quenching requirement through laser irradiation.
Description
Technical Field
The invention belongs to the technical field of mechanical manufacturing, and relates to a thread surface quenching method for a high-nickel alloy structural steel-made steel part, which can enable the thread surface of the high-nickel alloy structural steel-made steel part to meet the surface quenching requirement through laser irradiation.
Background
At present, the aerospace industry is vigorously developed in China, various types of wind tunnel test equipment are built on the basis of development, main parts of wind tunnels are high-pressure gas generation devices made of high-nickel alloy structural steel such as 35CrNi3MoV or 36CrNi3MoV, the devices are generally formed by connecting a plurality of pipe bodies made of high-nickel alloy structural steel such as 35CrNi3MoV or 36CrNi3MoV, and the high-pressure gas generation devices are generally connected in a threaded mode. The pipe bodies generally have the diameter phi of 450-phi 1200 mm, the length of 6 m, the weight of at least 4 tons and the thread pitch of connecting threads of 12-60 mm, and because the diameter of a workpiece is large, the weight is heavy, the thread pitch of the threads is large, and thread gluing phenomenon can be frequently generated when the threads are meshed, in order to solve the thread gluing problem, the surface of the external threads needs to be quenched by a certain thickness, so that the hardness of the thickness layer is 15-60HB higher than that of a matrix. Because only the surface of the thread is quenched, the quenching in the traditional medium-frequency induction heating mode can not meet the requirement, and the problem needs to be solved by adopting a laser surface quenching technology.
Disclosure of Invention
The invention aims to break through the defects of the traditional medium-frequency induction heating quenching technology, and uses advanced laser quenching equipment to quench the surface of a part to be quenched with the depth of 0.4-1.2 mm to form a quenching layer, so that the surface hardness of the thread of the steel part made of the high-nickel alloy structural steel is improved, and the thread does not generate the thread gluing phenomenon in the screwing and disassembling processes along with the improvement of the surface hardness of the thread.
The purpose of the invention is realized as follows: a method for quenching the thread surface of steel part made of high-Ni alloy structure steel includes such steps as laser irradiating the thread surface of steel part to obtain the required heating temperature, quickly removing the laser beam, cooling the part to a temp lower than the cooling temp, and quenching the thread surface of steel part by a laser emitter (1000-4000W) with 5-30 mm length and 100-300 mm distance from emitter to the thread surface of steel part at 45-90 deg. of incident angle.
The depth of the thread quenching layer of the workpiece is controlled to be 0.4-1.2 mm by controlling the irradiation power, the length of the irradiation line segment, the light moving speed, the incident angle and the irradiation distance, and the hardness of the quenching layer is 15-60HB higher than that of the matrix.
The invention has the following beneficial effects:
the invention adopts laser to irradiate the surface of a workpiece in a line segment shape, so that the material with a certain depth on the surface of the workpiece is quickly heated to the quenching structure transition temperature of the material used by the workpiece, and because the irradiation area of the laser is small, after the light rays move quickly, the irradiation part is quickly cooled to the temperature below the quenching cooling requirement due to the heat absorption of a matrix, thereby achieving the purpose of surface quenching. The depth and hardness of the quenching layer can be adjusted by adjusting the irradiation power, the length of the irradiation line segment, the moving speed of the light rays, the incident angle and the irradiation distance.
The thread surface quenching method only quenches the surface at a certain depth, the depth is controllable, the tissue of a matrix below a quenching layer is not damaged, the surface hardness is improved, and the thread gluing phenomenon cannot be generated in the screwing and disassembling processes. The production efficiency is high.
Drawings
FIG. 1 is a schematic representation of a threaded surface after laser quenching.
1 is a basal body part, 2 is a quenching layer, and the thickness of the layer is 0.4-1.2 mm.
Detailed Description
As shown in figure 1, in the thread surface quenching method for the steel part made of the high-nickel alloy structural steel, laser is irradiated to the thread surface of the high-nickel alloy structural steel workpiece in a line-shaped section, the irradiated part instantaneously reaches the heating temperature required by quenching due to laser irradiation, after the light is quickly removed, the matrix absorbs heat, the part is instantaneously cooled to the quenching cooling temperature, and thus the irradiated part meets the quenching requirement. The laser emitter is adopted to emit 1000-4000W power laser, the laser irradiates the thread surface of the workpiece in a line-segment shape, the length of the line segment is 5-30 mm, the distance between the emitter and the thread surface of the workpiece is 100-300 mm, the light irradiates the thread surface of the part of the workpiece needing to be quenched at an incident angle of 45-90 degrees and moves at the speed of 4-12 mm/s, and the scanning of the surface needing to be quenched is completed. The depth of the thread quenching layer of the workpiece can be controlled to be 0.4-1.2 mm by controlling the irradiation power, the length of the irradiation line segment, the light ray moving speed, the incident angle and the irradiation distance, and the hardness of the quenching layer is 15-60HB higher than that of the matrix.
The specific operation is as follows:
1. selecting laser quenching equipment with proper power according to the tooth height of the thread, wherein a laser emitter with the power between 1000 watts and 2000 watts is used below the tooth height of 10 mm, and a laser emitter with the power between 2000 watts and 4000 watts is used above 10 mm, so that the processing efficiency can be ensured;
2. when laser is irradiated, the laser line segment can be as long as the part needing quenching, and the quenching can be finished by one-time irradiation, or the part needing quenching
And gradually finishing quenching by N times of irradiation. Because the length of the formed laser line segment is closely related to the distance between the surface of the emitter and the quenching surface and the incident angle of the light, the light is controlled to irradiate the surface of the part of the workpiece needing quenching at an incident angle of 45-90 DEG when the length of the irradiation line segment is selected, and meanwhile, the distance between the surface of the emitter and the quenching surface is controlled to be 100-300 mmSpacing;
3. after the irradiation power and the length of the laser line segment are selected, the moving speed of the light can be selected according to the quenching depth and the required hardness, and at the moment, the slower the moving speed is, the deeper the quenching depth is, and the higher the hardness is.
Example 1: the thread laser surface quenching method for the wind tunnel pipe body comprises the steps of performing laser surface quenching on the thread of the wind tunnel pipe body, wherein the major diameter phi of the thread of the product is 880 millimeters, the thread pitch is 60 millimeters, the tooth height is 30 millimeters, the required quenching depth is 0.5-07 millimeters, the hardness of a workpiece substrate is 310 and 320HB, and the hardness of the surface of the thread after quenching is larger than or equal to 340 HB.
The specific surface quenching process is as follows:
1. and a 3000-watt laser transmitter is selected according to the height of the thread tooth of 30 mm, and the output power is 2800 watts.
2. During laser irradiation, one-time irradiation is completed, and at the time of an incident angle of 60 degrees, the distance between the surface of the emitter and the quenching surface is 240 mm.
3. The line sections were irradiated over the rough quench surface at a speed of 5 mm/sec.
4. And after the sample is cut, performing metallographic detection, and detecting that the depth of a quenching layer is 0.7 mm, the hardness of the quenching layer is 360HB, and the hardness of a matrix is unchanged. The result meets the requirements for surface quenching.
Claims (2)
1. A thread surface quenching method for a steel part made of high-nickel alloy structural steel is characterized by comprising the following steps: the method comprises the steps of irradiating the threaded surface of a high-nickel alloy structural steel workpiece by laser, enabling the irradiated part to instantly reach the heating temperature required by quenching, enabling the light to quickly move away, absorbing heat by a base body, instantly cooling the part to be below the quenching cooling temperature, enabling the threaded surface of the high-nickel alloy structural steel workpiece to meet the surface quenching requirement, specifically, emitting 1000-4000W power laser by a laser emitter, irradiating the laser to the threaded surface of the workpiece in a line segment shape, enabling the length of the line segment to be 5-30 mm, enabling the distance from the emitter to the threaded surface of the workpiece to be 100-300 mm, irradiating the light to the threaded surface of the workpiece to be quenched by an incident angle of 45-90 degrees, moving at the speed of 4-12 mm/s, and completing the scanning of the surface to be quenched.
2. The method for quenching the threaded surface of a steel member made of high nickel alloy structural steel according to claim 1, wherein: the depth of the thread quenching layer of the workpiece is controlled to be 0.4-1.2 mm by controlling the irradiation power, the length of the irradiation line segment, the light moving speed, the incident angle and the irradiation distance, and the hardness of the quenching layer is 15-60HB higher than that of the matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210421180.5A CN114774638A (en) | 2022-04-21 | 2022-04-21 | Thread surface quenching method for steel part made of high-nickel alloy structural steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210421180.5A CN114774638A (en) | 2022-04-21 | 2022-04-21 | Thread surface quenching method for steel part made of high-nickel alloy structural steel |
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| Publication Number | Publication Date |
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| CN114774638A true CN114774638A (en) | 2022-07-22 |
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|---|---|---|---|
| CN202210421180.5A Pending CN114774638A (en) | 2022-04-21 | 2022-04-21 | Thread surface quenching method for steel part made of high-nickel alloy structural steel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59208022A (en) * | 1983-05-12 | 1984-11-26 | Ntn Toyo Bearing Co Ltd | Surface hardening method of screw shaft by irradiation of laser |
| JPH07268448A (en) * | 1994-03-30 | 1995-10-17 | Hitachi Seiki Co Ltd | Laser hardening method and device therefor |
| CN104531958A (en) * | 2014-11-12 | 2015-04-22 | 上海海隆石油钻具有限公司 | A screw thread surface laser processing method |
| CN106119468A (en) * | 2016-08-19 | 2016-11-16 | 上海诺信汽车零部件有限公司 | Vacuum automobile pump rotor laser-quenching method |
| CN108220575A (en) * | 2017-12-30 | 2018-06-29 | 中钢集团邢台机械轧辊有限公司 | A kind of laser reinforcing process of shaft-like workpiece |
| CN108315531A (en) * | 2018-02-07 | 2018-07-24 | 华中科技大学 | A kind of deep layer high rigidity composite surface quenching strengthening method |
| CN113857653A (en) * | 2021-12-03 | 2021-12-31 | 太原理工大学 | Surface modification device of ultrasonic-assisted laser |
-
2022
- 2022-04-21 CN CN202210421180.5A patent/CN114774638A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59208022A (en) * | 1983-05-12 | 1984-11-26 | Ntn Toyo Bearing Co Ltd | Surface hardening method of screw shaft by irradiation of laser |
| JPH07268448A (en) * | 1994-03-30 | 1995-10-17 | Hitachi Seiki Co Ltd | Laser hardening method and device therefor |
| CN104531958A (en) * | 2014-11-12 | 2015-04-22 | 上海海隆石油钻具有限公司 | A screw thread surface laser processing method |
| CN106119468A (en) * | 2016-08-19 | 2016-11-16 | 上海诺信汽车零部件有限公司 | Vacuum automobile pump rotor laser-quenching method |
| CN108220575A (en) * | 2017-12-30 | 2018-06-29 | 中钢集团邢台机械轧辊有限公司 | A kind of laser reinforcing process of shaft-like workpiece |
| CN108315531A (en) * | 2018-02-07 | 2018-07-24 | 华中科技大学 | A kind of deep layer high rigidity composite surface quenching strengthening method |
| CN113857653A (en) * | 2021-12-03 | 2021-12-31 | 太原理工大学 | Surface modification device of ultrasonic-assisted laser |
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