CN109821820B - Laser cleaning method for surface of nodular cast iron - Google Patents
Laser cleaning method for surface of nodular cast iron Download PDFInfo
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- CN109821820B CN109821820B CN201910182262.7A CN201910182262A CN109821820B CN 109821820 B CN109821820 B CN 109821820B CN 201910182262 A CN201910182262 A CN 201910182262A CN 109821820 B CN109821820 B CN 109821820B
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- laser cleaning
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Abstract
The invention discloses a laser cleaning method for the surface of nodular cast iron, which is characterized in that the average output power, the repetition frequency, the output laser pulse width, the output spot size and the scanning speed of a laser cleaning machine are adjusted, the light spot is adjusted to act on the surface of the nodular cast iron, the graphite particles on the surface of the nodular cast iron are effectively removed by scanning laser, the cleaning efficiency is improved, and the damage to a nodular cast iron substrate is effectively avoided while the graphite particles on the surface of the nodular cast iron are removed.
Description
Technical Field
The invention relates to the field of laser engineering, in particular to a laser cleaning method for a surface of nodular cast iron.
Background
Cast iron, particularly nodular cast iron, has been developed as an irreplaceable metal material for casting mechanical parts with complicated stress and high requirements, and is widely applied to many important engineering components. At present, the method is applied to various fields of national economy, such as automobiles, engines, engineering machinery, agricultural machinery, cast pipes, pipe fittings, machine tools and the like. The carbon element in the nodular cast iron is distributed in the cast iron in a spheroidal graphite state, which is shown in the surface of the cast iron that the spheroidal graphite is embedded in the cast iron. In engineering, engineering components often need to be welded, and spherical graphite embedded in cast iron has a large influence on welding performance. Because the graphite has stable performance, the existing cleaning methods such as acid washing, alkali washing and the like can not be effectively removed, and certain damage is easily caused to the surface of the cast iron.
Disclosure of Invention
The invention aims to provide a high-efficiency laser cleaning method for the surface of nodular cast iron, which can effectively remove graphite particles on the surface of the nodular cast iron and simultaneously avoid damage to a nodular cast iron matrix.
In order to achieve the purpose, the invention provides the following scheme:
a laser cleaning method for the surface of nodular cast iron includes such steps as regulating the average output power, repetition frequency, laser pulse width, spot size and scan rate of laser cleaner, and regulating the spot size to act on the surface of nodular cast iron for laser cleaning.
Preferably, the light source of the laser cleaning machine is an LD pumping solid laser;
the output wavelength of the LD pumping solid laser is 1064 nm.
The average output power of the laser cleaning machine is adjusted to be 180-220W.
The repetition frequency of the laser cleaning machine is adjusted to be 8-12 kHz.
The pulse width of the laser output by the laser cleaning machine is adjusted to be 60-100 ns.
Further, the light spot output by the laser cleaning machine is a circular light spot, and the diameter of the circular light spot is adjusted to be 0.5-1 mm;
and adjusting the laser cleaning machine to output a string of the round light spots to form a line light spot.
Preferably, the scanning speed of the line light spot is adjusted to be 3-4cm/s, and the line light spot acts on the surface of the cleaning object.
Preferably, one surface of the nodular cast iron is repeatedly cleaned for multiple times until the carbon content of the surface of the nodular cast iron is detected to meet the requirement through an EDS technology.
Specifically, the carbon content index of the surface of the cleaned nodular cast iron is determined according to the use environment of the nodular cast iron, so that the actual carbon content value of the surface of the cleaned nodular cast iron, detected by an EDS (electronic discharge system) technology, is lower than the carbon content index of the nodular cast iron in the corresponding use environment.
Preferably, the time interval between the two times of washing is more than 1 min.
Preferably, after the cleaning of one surface of the nodular cast iron is finished, the nodular cast iron is manually rotated, and the remaining uncleaned surface is cleaned.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a laser cleaning method for a surface of nodular cast iron, which is characterized in that a laser cleaning machine with a solid laser as a light source is selected, and the average output power, the repetition frequency, the output laser pulse width, the spot size acting on the surface of a cleaning object and the scanning speed of the laser cleaning machine are adjusted to realize the effective removal of graphite particles on the surface of the nodular cast iron by scanning laser. And moreover, the cleaning is carried out by laser scanning, so that the cleaning efficiency is improved, and the damage to the nodular cast iron matrix is effectively avoided while graphite particles on the surface of the nodular cast iron are removed.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a high-efficiency laser cleaning method for the surface of nodular cast iron, which can effectively remove graphite particles on the surface of the nodular cast iron and simultaneously avoid damage to a nodular cast iron matrix
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
Example 1:
taking a nodular cast iron sample in any shape, and cleaning by adopting the following process:
selecting a laser cleaning machine light source as an LD pumping solid laser, wherein the output wavelength is 1064 nm;
adjusting the average output power of the laser cleaning machine to be 180W;
adjusting the repetition frequency of the laser cleaning machine to be 8 kHz;
adjusting the pulse width of the output laser of the laser cleaning machine to be 60 ns;
adjusting the spot size of the laser output by the laser cleaning machine on the surface of the cleaning object to be 0.5 mm;
adjusting output line light spots of the laser cleaning machine;
scanning the surface of the nodular cast iron by utilizing linear light spots at a scanning speed of 3cm/s, and separating graphite particles on the surface of the cast iron from the cast iron under the action of scanning laser;
the nodular cast iron is cleaned twice by the method, and the time interval between the two times of cleaning is more than 1 min.
And observing the cleaned sample under a scanning electron microscope, and basically removing the spherical graphite on the surface.
Example 2:
taking a nodular cast iron sample in any shape, and cleaning by adopting the following process:
selecting a laser cleaning machine light source as an LD pumping solid laser, wherein the output wavelength is 1064 nm;
adjusting the average output power of the laser cleaning machine to 220W;
adjusting the repetition frequency of the laser cleaning machine to be 12 kHz;
adjusting the pulse width of the output laser of the laser cleaning machine to be 100 ns;
adjusting the spot size of the laser output by the laser cleaning machine on the surface of the cleaning object to be 1 mm;
adjusting output line light spots of the laser cleaning machine;
scanning the surface of the nodular cast iron by utilizing linear light spots at a scanning speed of 4cm/s, wherein graphite particles on the surface of the nodular cast iron are separated from the nodular cast iron under the action of scanning laser;
the nodular cast iron is cleaned twice by the method, and the time interval between the two times of cleaning is more than 1 min.
And observing the cleaned sample under a scanning electron microscope, and basically removing the spherical graphite on the surface.
Example 3:
taking a nodular cast iron sample in any shape, and cleaning by adopting the following process:
selecting a laser cleaning machine light source as an LD pumping solid laser, wherein the output wavelength is 1064 nm;
adjusting the average output power of the laser cleaning machine to 200W;
adjusting the repetition frequency of the laser cleaning machine to be 10 kHz;
adjusting the pulse width of the output laser of the laser cleaning machine to be 80 ns;
adjusting the spot size of the laser output by the laser cleaning machine on the surface of the cleaning object to be 0.5 mm;
adjusting output line light spots of the laser cleaning machine;
the nodular cast iron is manually rotated, so that the linear light spot output by the laser cleaning machine can just act on the surface of the nodular cast iron to be cleaned.
Scanning the surface of the nodular cast iron by utilizing linear light spots at a scanning speed of 3cm/s, wherein graphite particles on the surface of the nodular cast iron are separated from the nodular cast iron under the action of scanning laser;
cleaning the same surface of the nodular cast iron twice by the method, wherein the time interval between the two times of cleaning is more than 1 min;
and observing the cleaned sample under a scanning electron microscope, and basically removing the spherical graphite on the surface.
The invention provides a laser cleaning method for a surface of nodular cast iron. The method has the advantages that the laser cleaning machine with the solid laser as the light source is selected, parameters such as laser pulse frequency, pulse width, average power, light spot scanning rate and the like of the laser cleaning machine are adjusted, and graphite particles on the surface of the nodular cast iron are effectively removed. The method has the characteristic of selective removal, and can effectively avoid the damage of the nodular cast iron matrix while removing graphite particles. The method is simple and easy to implement, and the removal efficiency of the graphite particles on the surface of the nodular cast iron is high.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A laser cleaning method for the surface of nodular cast iron is characterized by comprising the steps of adjusting the average output power, the repetition frequency, the output laser pulse width, the output light spot size and the scanning speed of a laser cleaning machine, and adjusting the light spot to act on the surface of the nodular cast iron for laser cleaning; the light source of the laser cleaning machine is an LD pumping solid laser;
the output wavelength of the LD pumping solid laser is 1064 nm;
the average output power of the laser cleaning machine is adjusted to be 180-220W;
the repetition frequency of the laser cleaning machine is adjusted to be 8-12 kHz;
the pulse width of the laser output by the laser cleaning machine is adjusted to be 60-100 ns;
the light spot output by the laser cleaning machine is a circular light spot, and the diameter of the circular light spot is adjusted to be 0.5-1 mm;
adjusting the laser cleaning machine to output a string of the round light spots to form a line light spot;
adjusting the scanning speed of the line light spot to be 3-4cm/s, and acting on the surface of the cleaning object;
the time interval between the two times of cleaning for multiple times is more than 1 min.
2. The laser cleaning method for the surface of the nodular cast iron according to claim 1, wherein the surface of the nodular cast iron is repeatedly cleaned for a plurality of times until the carbon content of the surface of the nodular cast iron is detected to meet the requirement through an EDS technology.
3. The laser cleaning method for the surface of nodular cast iron according to claim 2, wherein after the cleaning of one surface of the nodular cast iron is completed, the surface of the nodular cast iron which is not cleaned is cleaned by manually rotating the nodular cast iron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910182262.7A CN109821820B (en) | 2019-03-11 | 2019-03-11 | Laser cleaning method for surface of nodular cast iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910182262.7A CN109821820B (en) | 2019-03-11 | 2019-03-11 | Laser cleaning method for surface of nodular cast iron |
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| CN109821820A CN109821820A (en) | 2019-05-31 |
| CN109821820B true CN109821820B (en) | 2021-02-05 |
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| CN111282921A (en) * | 2020-03-07 | 2020-06-16 | 深圳市汇泽激光科技有限公司 | Method for cleaning paper pulp molding product mold |
| CN112475505A (en) * | 2020-11-24 | 2021-03-12 | 爱发科电子材料（苏州）有限公司 | Welding structure and welding method for target and back plate |
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| CN85103734A (en) * | 1985-05-17 | 1986-11-19 | 罗伯特·兰根 | Remove the method for metal surface dirt, particularly corrosion |
| JPH02197588A (en) * | 1989-01-27 | 1990-08-06 | Sintokogio Ltd | Method for removing scale or rust from steel product |
| EP1340556A2 (en) * | 2002-03-01 | 2003-09-03 | Foundation for Research and Technology-Hellas (FO.R.T.H.), Institute of Electronic Structure and Laser | A method and device for cleaning surfaces using temporarily coincidental laser pulses of two different wavelengths |
| US6747243B1 (en) * | 2002-12-24 | 2004-06-08 | Novellus Systems, Inc. | Spot cleaning of particles after inspection |
| WO2015107325A1 (en) * | 2014-01-15 | 2015-07-23 | Woodrow Scientific Limited | Methods and apparatus for laser cleaning |
| CN107234106A (en) * | 2017-07-21 | 2017-10-10 | 新兴铸管股份有限公司 | The device cleaned to ductile iron pipe or pipe die outer wall |
| CN107639083A (en) * | 2017-11-07 | 2018-01-30 | 武汉翔明激光科技有限公司 | A kind of aluminium alloy anode oxide film dry laser cleaning equipment and cleaning method |
| CN108636947A (en) * | 2018-06-04 | 2018-10-12 | 含山县兴达球墨铸铁厂 | A kind of cleaning device of ductile iron pipe |
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2019
- 2019-03-11 CN CN201910182262.7A patent/CN109821820B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103734A (en) * | 1985-05-17 | 1986-11-19 | 罗伯特·兰根 | Remove the method for metal surface dirt, particularly corrosion |
| JPH02197588A (en) * | 1989-01-27 | 1990-08-06 | Sintokogio Ltd | Method for removing scale or rust from steel product |
| EP1340556A2 (en) * | 2002-03-01 | 2003-09-03 | Foundation for Research and Technology-Hellas (FO.R.T.H.), Institute of Electronic Structure and Laser | A method and device for cleaning surfaces using temporarily coincidental laser pulses of two different wavelengths |
| US6747243B1 (en) * | 2002-12-24 | 2004-06-08 | Novellus Systems, Inc. | Spot cleaning of particles after inspection |
| WO2015107325A1 (en) * | 2014-01-15 | 2015-07-23 | Woodrow Scientific Limited | Methods and apparatus for laser cleaning |
| CN107234106A (en) * | 2017-07-21 | 2017-10-10 | 新兴铸管股份有限公司 | The device cleaned to ductile iron pipe or pipe die outer wall |
| CN107639083A (en) * | 2017-11-07 | 2018-01-30 | 武汉翔明激光科技有限公司 | A kind of aluminium alloy anode oxide film dry laser cleaning equipment and cleaning method |
| CN108636947A (en) * | 2018-06-04 | 2018-10-12 | 含山县兴达球墨铸铁厂 | A kind of cleaning device of ductile iron pipe |
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| CN109821820A (en) | 2019-05-31 |
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