CN111944983A - Band saw blade heat treatment process - Google Patents
Band saw blade heat treatment process Download PDFInfo
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- CN111944983A CN111944983A CN202010757879.XA CN202010757879A CN111944983A CN 111944983 A CN111944983 A CN 111944983A CN 202010757879 A CN202010757879 A CN 202010757879A CN 111944983 A CN111944983 A CN 111944983A
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- carbon powder
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000000084 colloidal system Substances 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 230000035939 shock Effects 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 11
- 238000005728 strengthening Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 3
- 229910021392 nanocarbon Inorganic materials 0.000 claims description 3
- 238000010000 carbonizing Methods 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 17
- 238000005255 carburizing Methods 0.000 description 16
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000002635 electroconvulsive therapy Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 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
- C21D9/24—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for saw blades
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to a metallurgical technology, in particular to a heat treatment process problem of a band saw blade, and belongs to the technical field of saw blade production. The invention relates to a band saw blade heat treatment process, which comprises the following steps: s1, coating carbon on a band saw blade: coating carbon powder colloid on the surface of the sawtooth part of the band saw blade, and drying for later use; s2, laser shock: arranging a restraint layer above the dried band saw blade, and then carrying out laser processing; s3, quenching: heating and quenching the band saw blade treated by the S2 at the quenching temperature of 750 and 830 ℃ for 35-55 min; s4, low-temperature tempering: tempering the quenched band saw blade at low temperature of 150 ℃ and 250 ℃ for 1.5-2 h; s5, grinding and polishing: and grinding and polishing the surface of the band saw blade after low-temperature tempering. The hardness, the wear resistance, the fatigue strength and the comprehensive mechanical property of the processed band saw blade are improved; meanwhile, the production period of the band saw blade is shortened.
Description
Technical Field
The invention relates to a metallurgical technology, in particular to a heat treatment process problem of a band saw blade, and belongs to the technical field of saw blade production.
Background
Band saw blades are band saw blades constructed of a tough, sharp-toothed blade tensioned into a frame and used to cut metal and other hard materials. Since the band saw blade is used to cut a material having a relatively high hardness, the requirement for the hardness of the band saw blade itself is high, and thus, it is necessary to heat-treat the band saw blade to improve the hardness and wear resistance thereof, thereby prolonging the service life thereof.
Carburizing is a common heat treatment process for metal materials, can improve the hardness, wear resistance and fatigue strength of the surface layer of a machine part, and simultaneously keeps the toughness and plasticity of the center of the machine part so as to enable the machine part to bear impact load. The carburization is applied to the band saw blade treatment, so that the comprehensive mechanical property of the band saw blade can be improved. But the carburizing treatment process has long period, high energy consumption and low production efficiency.
The laser shock peening is a novel surface treatment technology, and the principle of the laser shock peening technology is that when laser penetrates through a restraint layer and acts on a coating coated on a metal surface, the coating absorbs laser energy and is rapidly gasified to form a large amount of dense high-temperature plasma, the plasma continues to absorb the laser energy under the restraint of the restraint layer to rapidly increase the temperature and expand, and then the plasma is exploded to form high-strength shock waves to act on the metal surface, so that the metal surface is subjected to plastic deformation, and the microstructure [1] of the material surface is changed. The research proves that the laser shock strengthening can increase the dislocation density in the microstructure of the surface of the material, refine the grains and improve the wear resistance of the material.
Patent CN109266831a discloses a heat treatment method for saw blade production, comprising the following steps: cleaning saw blade, washing with cleaning liquid, drying saw blade, carburizing and boxing saw blade, charging in carburizing box, taking out for air cooling, cleaning with boiling water, quenching saw blade, tempering saw blade at low temperature, washing nitrate, and finally drying and oiling. The heat treatment method adopts a solid carburization mode, increases the depth of a carburized layer, and improves the hardness, the wear resistance, the fatigue strength and the comprehensive mechanical property of the saw blade, thereby prolonging the service life of the saw blade. The time required for the entire heat treatment is about 5.45 to 8 hours.
Patent CN 111218553A discloses a heat treatment process for band saw blades, which comprises the following steps: normalizing, salt bath nitriding, salt bath oxidizing and desalting cleaning. The saw blade adopts one-time normalizing and one-time tempering, in order to shorten the heat treatment period of the saw blade, on the premise of uniformly heating a steel piece, the temperature rise speed of the one-time normalizing is 4 ℃/min, the temperature during normalizing is 600-. The time required for the entire heat treatment is about 5.35 to 12 hours.
In summary, in the above two patents and in the existing band saw blade processing technology, the heat treatment process method used takes a long time in the carburizing and nitriding processes, and therefore, how to improve the hardness, wear resistance and abrasion resistance of the band saw blade and the comprehensive mechanical properties of the band saw blade and shorten the production cycle is a problem that we should solve at present.
[1] The laser impact and carburization composite process improves the abrasion performance of 12CrNi3A steel [ J ]. the strong laser and particle beam, 2014,26(05): 308-wall 313.
Disclosure of Invention
Aiming at the problems of long carburizing process, low carburizing speed and low production efficiency in the carburizing treatment technology of the band saw blade, the invention aims to provide a method for pressing carbon powder into the surface and the interior of the band saw blade by a laser impact carburizing method, so that the performance of the band saw blade is improved, and the production process time of the band saw blade is shortened.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a band saw blade heat treatment process comprises the following steps:
s1, coating carbon on a band saw blade: coating carbon powder colloid on the surface of the sawtooth part of the band saw blade, and drying for later use;
s2, laser shock: covering a layer of restraint layer on the surface of the dried band saw blade coated with the carbon powder colloid, and then carrying out laser strengthening impact;
s3, quenching: heating and quenching the band saw blade treated by the S2 at the quenching temperature of 750 and 830 ℃ for 35-55 min;
s4, low-temperature tempering: tempering the quenched band saw blade at low temperature of 150 ℃ and 250 ℃ for 1.5-2 h;
s5, grinding and polishing: and grinding and polishing the surface of the band saw blade after low-temperature tempering.
Preferably, the band saw blade is carbonized in step S1 by using an automatic carbonizing device. The automatic carbon coating device can be any device capable of realizing the automatic carbon coating effect.
Preferably, the automatic carbon coating device is shown in fig. 2.
Preferably, the method for preparing the carbon powder colloid in the step S1 is to add 30ml of DMF and 50ml of toluene to each 20g of nano carbon powder for ultrasonic treatment.
The mixed solution of DMF and toluene is used to prepare carbon powder colloid, which can be spread out uniformly on the sawtooth part and volatilized quickly at proper temperature, and is fixed on the surface and inside of the sawtooth by laser.
Preferably, the thickness of the carbon powder colloid in the step S1 can be adjusted.
Preferably, the thickness of the carbon powder colloid in the step S1 is 0.2-1 mm.
The thickness of the carbon powder has obvious influence on the properties of the processed band saw blade such as hardness and the like.
Preferably, the drying in step S1 is natural drying solidification or drying.
Preferably, the band saw blade charcoal coating time in the step S1 is 1.0-1.5 h.
Preferably, in step S2, the constraining layer is made of glass.
The restraint layer can improve the effective pressure of laser shock waves, and the distance between the restraint layer and the band saw blade is adjustable, so that the restraint layer can meet the requirements of different carbon powder thicknesses.
Preferably, in the step S2, the power of the laser in the laser strengthening impact is 4kw, the scanning speed is 5mm/S, the spot diameter is 6mm, and the laser parameters are changed accordingly according to the actual processing situation.
Preferably, the quenching temperature in the step S3 is 780-810 ℃, and the time is 35 min.
The quenching can refine the grains to improve the surface hardness and the toughness of the core.
Preferably, the temperature of the low-temperature tempering in the step S4 is 200 ℃, and the heat preservation time is 1.5 h.
The low temperature tempering is used for eliminating the stress after quenching.
The invention is further explained below:
in the prior art, the heat treatment technology of the band saw blade is that carburization and nitrogen treatment are often adopted in the production process of the band saw blade to improve the hardness, the wear resistance, the fatigue strength and the comprehensive mechanical property of the band saw blade. The technological process of "carburizing treatment technology" consumes much energy, has long time, low carburizing speed and low production efficiency, because a long period of process is needed for the active carbon atoms to penetrate into the surface and the interior of the material, and the carburizing treatment process has pollution.
The band saw blade passes through the carbon coating device, the surface of the sawtooth part of the band saw blade is coated with a layer of carbon powder colloid, and the thickness of the carbon powder colloid can be adjusted; then, carbon powder is pressed into the surface and the interior of the band saw blade by a laser impact carburization method, so that the carburization effect is achieved, the scanning speed is high, carburization is not required to be performed through a carburizing furnace, no pollution is caused, and the efficiency is high.
The invention has the beneficial effects that:
1. the hardness, the wear resistance, the fatigue strength and the comprehensive mechanical property of the band saw blade are improved;
2. the process of the invention is clean and pollution-free, saves raw materials, and shortens the production period of the band saw blade.
Drawings
FIG. 1 is a flow chart of a band saw blade heat treatment process based on laser carburization.
FIG. 2 is a schematic view of a carbon coating apparatus; wherein 1 is a band saw blade, 2 is a thin brush, 3 is a cross rod, 4 is a knob, 5 is a fixing frame, 6 is a vertical rod, and 7 and 8 are clips.
Detailed Description
Example 1
The process of treating a band saw blade is shown in FIG. 1. The method comprises the steps of firstly passing the band saw blade through a carbon coating device, coating a layer of carbon powder colloid on the surface of the sawtooth part of the band saw blade, and adding 30ml of DMF (dimethyl formamide) and 50ml of methylbenzene mixed solution into every 20g of nano carbon powder for ultrasonic treatment. The carbon coating device is shown in figure 2. The coating process comprises the following steps: the fine brush 2 moves horizontally along the cross bar 3 under the control of the knob 4, so that the carbon powder colloid is coated on the sawtooth surface of the band saw blade 1. Meanwhile, the cross rod 3 can move up and down along the vertical rod 6 under the control of the fixing frame 5, and 7 and 8 clamp fixing devices are arranged. The thickness of the carbon powder colloid is 0.2mm, and the time is about 1.5h after the carbon powder colloid is naturally dried and solidified or dried. The surface of the saw blade teeth coated with the carbon layer was treated with laser shock. Before laser shock treatment, a restraint layer is attached to the surface of the band saw blade sawteeth coated with the carbon layer. The restraint layer is made of glass, effective pressure of laser shock waves can be improved, and the distance between the restraint layer and the band saw blade is adjustable so as to meet requirements of different carbon powder thicknesses. The laser power was 4kw, the scanning speed was 5mm/s, and the spot diameter was 6 mm.
And carrying out primary heating quenching on the band saw blade subjected to laser impact carburization at 780-810 ℃, and keeping the temperature for 35 min. The quenching can refine the grains to improve the surface hardness and the toughness of the core.
Low temperature tempering at 150 ℃ and 250 ℃ for 1.5-2 h. This process serves to relieve post-quench stresses. And (4) grinding and polishing the redundant carbon powder layer on the surface of the band saw blade. Specific properties are shown in Table 1
Example 2
The thickness of the carbon powder colloid was changed to 0.5 and 1.0mm, and the other operations were performed in the same manner as in example 1, and the specific properties are shown in Table 1
Example 3
The method comprises the steps of saw blade cleaning, cleaning fluid flushing, saw blade drying, saw blade carburizing and boxing, carburizing and boxing furnace charging, air cooling after taking out, boiling water cleaning, saw blade quenching, saw blade low-temperature tempering and nitrate flushing according to the patent CN109266831A, and finally testing the performance of the saw blade after drying and oiling, wherein the specific performance is shown in the table 1.
TABLE 1 summary of band saw blade Properties
As can be seen from the data, the thickness of the carbon powder is increased, the hardness and the strength of the band saw blade are further enhanced, compared with the carburizing and boxing process (embodiment 3) in the prior art, the hardness and the strength are further improved, and the process time is saved.
Claims (8)
1. A band saw blade heat treatment process is characterized by comprising the following steps:
s1, coating carbon on a band saw blade: coating carbon powder colloid on the surface of the sawtooth part of the band saw blade, and drying for later use;
s2, laser shock: covering a layer of restraint layer on the surface of the dried band saw blade coated with the carbon powder colloid, and then carrying out laser strengthening impact;
s3, quenching: heating and quenching the band saw blade treated by the S2 at the quenching temperature of 750 and 830 ℃ for 35-55 min;
s4, low-temperature tempering: tempering the quenched band saw blade at low temperature of 150 ℃ and 250 ℃ for 1.5-2 h;
s5, grinding and polishing: and grinding and polishing the surface of the band saw blade after low-temperature tempering.
2. The thermal process according to claim 1, wherein the band saw blade is carbonized in step S1 by an automatic carbonizing device.
3. The thermal processing process according to claim 1, wherein the carbon powder colloid in step S1 is prepared by adding 30ml DMF and 50ml toluene per 20g nano carbon powder, and performing ultrasonic dispersion.
4. The thermal processing process according to claim 1, wherein the thickness of the carbon powder colloid in the step S1 is 0.2-1 mm.
5. The thermal process according to claim 1, wherein the laser power in the laser strengthening shock in step S2 is 4kw, the scanning speed is 5mm/S, and the spot diameter is 6 mm.
6. The thermal process according to claim 1, wherein the constraining layer in step S2 is made of glass.
7. The heat treatment process as claimed in claim 1, wherein the quenching temperature in step S3 is 780-810 ℃ for 35 min.
8. The thermal processing process according to claim 1, wherein the temperature of the low temperature tempering in the step S4 is 200 ℃, and the holding time is 1.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757879.XA CN111944983A (en) | 2020-07-31 | 2020-07-31 | Band saw blade heat treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757879.XA CN111944983A (en) | 2020-07-31 | 2020-07-31 | Band saw blade heat treatment process |
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| CN111944983A true CN111944983A (en) | 2020-11-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449882A (en) * | 2003-04-14 | 2003-10-22 | 倪柏钢 | Method for mfg of double-metal saw blade |
| CN106893970A (en) * | 2017-02-24 | 2017-06-27 | 吉林大学 | A kind of method of use Laser carburizing intensive treatment railway track |
| CN108914051A (en) * | 2018-06-21 | 2018-11-30 | 北京煜鼎增材制造研究院有限公司 | Metal material laser surface carburization process and its painting carbon device |
| US20190300977A1 (en) * | 2018-03-28 | 2019-10-03 | Marc Aaron Tima | Method of steel processing combining thermal and mechanical surface treatment to control metallurgical phase and mechanical response |
| CN111085728A (en) * | 2019-11-08 | 2020-05-01 | 湖南晟宏新材料科技有限公司 | Band saw blade manufacturing method and band saw blade |
-
2020
- 2020-07-31 CN CN202010757879.XA patent/CN111944983A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449882A (en) * | 2003-04-14 | 2003-10-22 | 倪柏钢 | Method for mfg of double-metal saw blade |
| CN106893970A (en) * | 2017-02-24 | 2017-06-27 | 吉林大学 | A kind of method of use Laser carburizing intensive treatment railway track |
| US20190300977A1 (en) * | 2018-03-28 | 2019-10-03 | Marc Aaron Tima | Method of steel processing combining thermal and mechanical surface treatment to control metallurgical phase and mechanical response |
| CN108914051A (en) * | 2018-06-21 | 2018-11-30 | 北京煜鼎增材制造研究院有限公司 | Metal material laser surface carburization process and its painting carbon device |
| CN111085728A (en) * | 2019-11-08 | 2020-05-01 | 湖南晟宏新材料科技有限公司 | Band saw blade manufacturing method and band saw blade |
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Application publication date: 20201117 |