CN111944988B - Laser shock strengthening method for metal band saw blade - Google Patents
Laser shock strengthening method for metal band saw blade Download PDFInfo
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- CN111944988B CN111944988B CN202010799060.XA CN202010799060A CN111944988B CN 111944988 B CN111944988 B CN 111944988B CN 202010799060 A CN202010799060 A CN 202010799060A CN 111944988 B CN111944988 B CN 111944988B
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- 230000035939 shock Effects 0.000 title claims abstract description 56
- 238000005728 strengthening Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 27
- 239000003292 glue Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000010432 diamond Substances 0.000 claims description 7
- 229910003460 diamond Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229920006335 epoxy glue Polymers 0.000 claims description 5
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 229910033181 TiB2 Inorganic materials 0.000 claims description 2
- 238000004513 sizing Methods 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 34
- 230000035882 stress Effects 0.000 description 12
- 238000003466 welding Methods 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 229910000639 Spring steel Inorganic materials 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000009191 jumping Effects 0.000 description 3
- 229910001103 M42 high speed steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to a laser shock strengthening method of a metal band saw blade, wherein the thickness of the metal band saw blade is 0.6-1.6mm, and the method comprises the following steps: uniformly mixing the glue and the hard particles to obtain a glue material; coating the sizing material on the surface of the area to be reinforced of the band saw blade, curing, and obtaining an absorption layer on the surface of the area to be reinforced; covering a transparent restraint layer on the surface of the absorption layer, then carrying out laser shock strengthening on the area to be strengthened, and removing the residual glue material on the surface of the band saw blade to obtain the band saw blade with a plurality of pits. The laser shock strengthening method of the metal saw blade can realize high-quality strengthening of the surface of the saw blade, can effectively eliminate the deformation of the whole structure of the saw blade after laser shock strengthening, and can reduce the attenuation of residual compressive stress of the strengthened surface caused by deformation.
Description
Technical Field
The invention relates to a laser shock strengthening method of a metal band saw blade, and belongs to the field of saw blade production.
Background
The metal band saw blade is generally formed by bimetal welding, the back material of the metal band saw blade is generally spring steel with high elasticity, and the tooth tip is high-speed steel or hard alloy steel with high hardness. Because of the thermal influence of the welding process, residual thermal stress (generally tensile stress) exists at the welding seam of the backing material and the tooth tip, and even defects such as micro cracks, air holes and the like exist. In the in-service use process, because of the influence of the circulating cutting force, the back material of the saw blade and the welding seam of the tooth tip are the weakest part of the fatigue life due to the factors, the tooth jumping is most easily caused at the position, and once the band saw blade has the tooth jumping at a certain position, the teeth are extremely easily jumped by the saw teeth around the band saw blade, so that the tooth jumping of a large area is caused, and the service life of the saw blade is greatly shortened.
The laser shock peening technology is an advanced material peening technology at present, and is commonly used for processing the surface of a metal material, so that the surface of the metal material obtains higher residual stress, and the fatigue crack initiation life is prolonged.
The applicant conjectures that the laser shock peening technology is applied to the strengthening of the metal saw blade, and residual compressive stress can be introduced to the surface of the saw blade, so that the generation and the expansion of fatigue cracks at a welding seam are delayed, and the fatigue life of the saw blade is greatly prolonged.
However, the thickness of the saw blade is generally thin (0.65-1.6 mm), and the applicant researches and discovers that if a reinforced area is formed on the surface of the saw blade by directly using a laser spot tower, the plastic strain of the reinforced area causes the reinforced surface area to be enlarged, and the reinforced area protrudes upwards, so that the integral structure of the saw blade is deformed. In addition, the deformation generated on the rear strengthening surface of the saw blade with smaller thickness has larger influence on the residual stress of the first strengthening surface, so that the amplitude of the residual compressive stress of the first strengthening surface is reduced. Therefore, the existing laser shock strengthening technology cannot be directly applied to strengthening of the metal band saw blade.
Therefore, it is highly desirable to invent a laser shock peening method for metal saw blades to overcome the disadvantages of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a laser shock strengthening method of a metal band saw blade, which is used for realizing high-quality shock strengthening of the metal band saw blade and avoiding the deformation of the whole structure caused by the laser shock strengthening.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a laser shock strengthening method for a metal band saw blade, the thickness of the metal band saw blade is 0.6-1.6mm, comprises the following steps:
s1, uniformly mixing glue and hard particles to obtain a glue material;
wherein the hard particles are spherical, and the diameter of the hard particles is 300-1000 mu m;
s2, coating the glue on the surface of the area to be reinforced of the band saw blade, curing, and obtaining an absorption layer on the surface of the area to be reinforced;
wherein the hardness of the hard particles is greater than that of the area to be strengthened of the band saw blade; the thickness of the absorption layer is 300-1000 mu m;
s3, covering a transparent restraint layer on the surface of the absorption layer, then carrying out laser shock strengthening on the area to be strengthened, and removing the residual glue on the surface of the band saw blade to obtain the band saw blade with a plurality of pits;
wherein the spot diameter of the laser is 1-6 mm, the pulse width is 8-16ns, the pulse energy is less than or equal to 10J, and the general laser parameters which are not mentioned are not particularly limited.
Further, the volume ratio of the hard particles to the glue is (1: 1) - (3: 1).
Further, in S1, the glue is a non-transparent glue, and preferably, the color of the glue is one of black, gray, blue, red, purple, green, and orange.
Further, in S1, the hard particles are diamond particles, TiB2One or more of particles and TiC particles; further, the diameter of the hard particles is 400-900 μm, preferably 500-800 μm.
Further, in S1, the glue is a normal temperature curing glue, further a black normal temperature curing glue, and further a black epoxy glue.
Further, in S2, the thickness of the absorbing layer is equal to the diameter of the hard particles, and the surface of the region to be strengthened has only one layer of hard particles, so that the force of the hard particles on the band saw blade is basically the same everywhere, thereby obtaining the pits with uniform size.
Further, in S3, the thickness of the transparent constraint layer is 0.5-2mm, and further, the transparent constraint layer is K9 glass.
Further, in S3, the band saw blade with the absorption layer is placed on the bottom plate with the absorption layer facing upward, the surface of the absorption layer is covered with the transparent constraint layer, the region to be reinforced is subjected to laser shock reinforcement, and the residual glue on the surface of the band saw blade is removed to obtain the band saw blade with a plurality of pits.
Further, in S3, the acoustic impedance of the base plate is greater than the acoustic impedance of the metal saw blade, and the thickness of the base plate is greater than 5 mm. Therefore, the reflection of the shock wave on the back of the saw blade can be reduced; when the surface is strengthened later, the influence of the tensile stress generated by the shock wave due to reflection on the surface strengthened first can be reduced, and the amplitude of the residual compressive stress of the surface strengthened first is prevented from being reduced.
Preferably, the bottom plate is a titanium alloy plate with the thickness of 6 mm.
Further in S3, the adhesive remaining on the surface of the band saw blade is removed by using a debonding agent. Generally, a degumming agent matched with the glue is selected, for example, when the glue adopted in S1 is acrylic glue, the acrylic degumming agent is selected.
Further, in S3, the spot diameter of the laser is 2-4mm, the pulse width is 8-14ns, and the pulse energy is 5-8J.
The invention adopts laser shock strengthening to strengthen the surface of the band saw blade, and has short pulse (ns level) and high power density (GW/cm)2Level) can lead to the material surface to take place the plasma explosion when the laser shines the absorbed layer, thereby form the shock wave of GPa magnitude, shock wave can transmit at first for the stereoplasm granule under transparent constrained layer effect, because the area of contact of stereoplasm granule and band saw blade is less (just beginning to be the point contact), after receiving shock wave pressure, can produce the pressure that is greater than shock wave direct action on band saw blade surface at band saw blade surface, make the stereoplasm granule can be impressed into the strap saw blade surface rapidly, and then make strap saw blade surface produce plastic deformation and form the pit, thereby make the saw blade surface produce residual compressive stress, and then delay the production and the extension of welding seam department fatigue crack, make its fatigue life improve greatly.
In addition, the absorption layer of the invention is thicker than the absorption layer used for common laser shock strengthening, and the existence of hard particles in the absorption layer can greatly attenuate shock waves when the shock waves are transmitted in the absorption layer, thereby effectively buffering the shock waves and directly transmitting the shock waves into the saw blade, and reducing the tensile stress waves generated by the shock waves reflected on the back of the saw blade, thereby avoiding the deformation of the whole structure of the band saw blade, and reducing the phenomenon of attenuation of residual compressive stress on the strengthened surface caused by the deformation.
In addition, the hard particles are spherical, after laser shock strengthening is completed, the spherical hard particles are embedded into the surface of the band saw blade to form pits with gradually increasing cross sectional areas from inside to outside, and in the subsequent step of removing the sizing material, the hard particles can be easily removed; moreover, the hard particles can be repeatedly used, which is beneficial to reducing the cost.
Drawings
FIG. 1 is a schematic view of laser shock peening of a band saw blade according to embodiment 1 of the present invention.
FIG. 2 is a schematic view of the surface of the reinforced band saw blade of example 1 of the present invention.
FIG. 3 is a schematic view of the surface of the reinforced band saw blade of example 2 of the present invention.
1-black epoxy glue; 2-diamond particles; 3-an absorbing layer; 4-metal band saw blade; 5-a transparent constraining layer; 6-a bottom plate; 7-laser; 8-pits.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
Example 1
Taking a metal band saw blade with the thickness of 1mm, which is welded by using D6A spring steel as a back material and M42 high-speed steel as a tooth material, strengthening the metal band saw blade, and specifically comprising the following steps:
(1) fully mixing 3M DP460 black epoxy glue 1 and black spherical diamond particles 2 with the diameter of 500 microns according to the volume ratio of 2:1 to form a black glue material;
(2) coating a layer of black sizing material on the surface of a region to be reinforced of the metal saw blade to be used as an absorption layer 3, wherein the thickness of the absorption layer 3 is 500 microns, and standing until the sizing material is completely cured;
(3) referring to fig. 1, a band saw blade 4 to be shock-strengthened is placed on a TC4 titanium alloy base plate 6 with a thickness of 6mm with the surface coated with an absorbing layer 3 facing upward, a layer of K9 glass with a thickness of 1mm is covered on the solidified absorbing layer 3 to serve as a transparent constraint layer 5, and laser shock strengthening is performed on an area to be strengthened by using a laser 7, wherein the diameter of a light spot of the laser 7 is 3mm, the pulse width is 8ns, and the pulse energy is 5J;
(4) after the laser shock strengthening is finished, the residual sizing material (including glue and diamond particles) on the surface layer of the band saw blade 4 is cleaned by using an epoxy glue degumming agent;
(5) and (4) carrying out laser shock strengthening on the other surface of the band saw blade (4) according to the steps (1) to (4).
The final band saw blade has an appearance as shown in fig. 2, and the surface of the band saw blade is provided with a plurality of pits, so that the residual stress on the metal surface can be increased due to the existence of the pits, and the fatigue life of the band saw blade is prolonged.
Example 2
Taking a metal band saw blade with the thickness of 0.8mm, which is welded by using D6A spring steel as a back material and M42 high-speed steel as a tooth material, the metal band saw blade is strengthened, and the method specifically comprises the following steps:
(2) fully mixing black ergo acrylic glue 1 and black spherical diamond particles 2 with the diameter of 250 micrometers according to the volume ratio of 3:1 to form a black glue material;
(2) coating a layer of black sizing material on the surface of a region to be reinforced of the metal saw blade to be used as an absorption layer 3, wherein the thickness of the absorption layer 3 is 250 micrometers, and standing until the sizing material is completely cured;
(3) referring to fig. 1, a band saw blade 4 to be shock-strengthened is placed on a TC4 titanium alloy base plate 6 with a thickness of 6mm with the surface coated with an absorbing layer 3 facing upward, a layer of K9 glass with a thickness of 1mm is covered on the solidified absorbing layer 3 to serve as a transparent constraint layer 5, and laser shock strengthening is performed on an area to be strengthened by using a laser 7, wherein the diameter of a light spot of the laser 7 is 3mm, the pulse width is 8ns, and the pulse energy is 3J;
(4) after the laser shock strengthening is finished, the residual sizing materials (including glue and diamond particles) on the surface layer of the band saw blade 4 are cleaned by using an acrylic acid glue degumming agent;
(5) and (4) carrying out laser shock strengthening on the other surface of the band saw blade (4) according to the steps (1) to (4).
The final band saw blade has an appearance as shown in fig. 3, and the surface of the band saw blade is provided with a plurality of pits, so that the residual stress on the metal surface can be increased due to the existence of the pits, and the fatigue life of the band saw blade is prolonged.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (16)
1. A laser shock strengthening method for a metal band saw blade is characterized by comprising the following steps of:
s1, uniformly mixing glue and hard particles to obtain a glue material;
wherein the hard particles are spherical, and the diameter of the hard particles is 300-1000 mu m;
s2, coating the glue on the surface of the area to be reinforced of the band saw blade, curing, and obtaining an absorption layer on the surface of the area to be reinforced;
wherein the hardness of the hard particles is greater than that of the area to be strengthened of the band saw blade; the thickness of the absorption layer is 300-1000 mu m; the thickness of the absorption layer is equal to the diameter of the hard particles;
s3, covering a transparent restraint layer on the surface of the absorption layer, then carrying out laser shock strengthening on the area to be strengthened, and removing the residual glue on the surface of the band saw blade to obtain the band saw blade with a plurality of pits;
wherein the diameter of a light spot of the laser is 1-6 mm, the pulse width is 8-16ns, and the pulse energy is less than or equal to 10J.
2. The laser shock peening method according to claim 1, wherein in S1, the glue is an opaque glue.
3. The laser shock peening method according to claim 2, wherein in S1, the glue is one of black, gray, blue, red, purple, green, and orange.
4. The laser shock peening method according to claim 1, wherein in S1, the hard particles are diamond particles, TiB2One or more of particles and TiC particles.
5. The laser shock peening method of claim 4, wherein the diameter of the hard particles is 400-900 μm.
6. The laser shock peening method of claim 5, wherein the diameter of the hard particles is 500-800 μm.
7. The laser shock peening method of claim 1, wherein in S1, the glue is a room temperature curing glue.
8. The laser shock peening method of claim 7, wherein in S1, the glue is black epoxy glue.
9. The laser shock peening method of claim 7, wherein in S1, the volume ratio of the hard particles to the glue is (1: 1) - (3: 1).
10. The laser shock peening method of claim 1, wherein in S3, the transparent constraining layer has a thickness of 0.5 to 2 mm.
11. The laser shock peening method of claim 10, wherein in S3, the transparent constraining layer is K9 glass.
12. The laser shock peening method according to claim 1, wherein in S3, the band saw blade is placed on a base plate with the side with the absorption layer facing upward, then a transparent restraint layer is covered on the surface of the absorption layer, then laser shock peening is performed on the area to be strengthened, and then the glue material remaining on the surface of the band saw blade is removed to obtain the band saw blade with a plurality of pits.
13. The laser shock peening method of claim 12, wherein in S3, the acoustic impedance of the base plate is greater than the acoustic impedance of the metal saw blade, and the thickness of the base plate is greater than 5 mm.
14. The laser shock peening method of claim 13, wherein the base plate is a titanium alloy plate having a thickness of 6 mm.
15. The laser shock peening method of claim 1, wherein in S3, a debonding agent is used to remove residual glue on the surface of the band saw blade.
16. The laser shock peening method according to claim 1, wherein in S3, the laser has a spot diameter of 2-4mm, a pulse width of 8-14ns, and a pulse energy of 5-8J.
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| CN113102832B (en) * | 2021-04-20 | 2022-07-12 | 湖南泰嘉新材料科技股份有限公司 | Band sawing machine and sawing method |
| CN113967796B (en) * | 2021-10-26 | 2023-09-22 | 江苏大学 | Method for preparing superhydrophobic surface by laser impact imprinting of micro-nano particles on aluminum alloy surface |
| CN115612984A (en) * | 2022-09-09 | 2023-01-17 | 中国科学院金属研究所 | Titanium diboride coating with stress and structural gradient and preparation method thereof |
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2020
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