CN105063325A - Band saw blade heat treatment technology - Google Patents
Band saw blade heat treatment technology Download PDFInfo
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- CN105063325A CN105063325A CN201510570753.0A CN201510570753A CN105063325A CN 105063325 A CN105063325 A CN 105063325A CN 201510570753 A CN201510570753 A CN 201510570753A CN 105063325 A CN105063325 A CN 105063325A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 8
- 238000005516 engineering process Methods 0.000 title abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 73
- 230000001590 oxidative effect Effects 0.000 claims abstract description 45
- 238000005121 nitriding Methods 0.000 claims abstract description 44
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 42
- 238000007669 thermal treatment Methods 0.000 claims description 33
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 28
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 17
- 239000011780 sodium chloride Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229910000639 Spring steel Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000009997 thermal pre-treatment Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 3
- 238000011033 desalting Methods 0.000 claims description 3
- NKCCODPFBDGPRJ-UHFFFAOYSA-N nitridocarbon(1+) Chemical compound N#[C+] NKCCODPFBDGPRJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 238000010791 quenching Methods 0.000 abstract description 6
- 150000002825 nitriles Chemical class 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 238000009792 diffusion process Methods 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 12
- 230000003628 erosive effect Effects 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005496 tempering Methods 0.000 description 5
- 150000001721 carbon Chemical group 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OMBRFUXPXNIUCZ-UHFFFAOYSA-N dioxidonitrogen(1+) Chemical compound O=[N+]=O OMBRFUXPXNIUCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Chemical Treatment Of Metals (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides band saw blade heat treatment technology. The technology comprises the following steps: A. preheating: preheating a band saw blade and removing the moisture on the surface of the band saw blade, wherein the temperature ranges from 350 DEG C to 400 DEG C and comprises 350 DEG C and 400 DEG C; the time ranges from 20 minutes to 40 minutes and comprises 20 minutes and 40 minutes; B. salt bath nitriding: carrying out salt bath nitriding treatment on the surface of the band saw blade by using QPQ (quench-polish-quench) nitriding salt so that active nitrogen in the QPQ nitriding salt permeates a metal lattice of the band saw blade, wherein the temperature ranges from 520 DEG C to 580 DEG C and comprises 520 DEG C and 580 DEG C; the salt bath nitriding time ranges from 10 minutes to 180 minutes and comprises 10 minutes and 180 minutes; C. salt bath oxidizing: carrying out salt bath oxidizing treatment on the band saw blade by using QPQ oxidizing salt to decompose cyanides on the surface of the band saw blade and form an oxidation film on the surface of the band saw blade, wherein the temperature ranges from 370 DEG C to 400 DEG C and comprises 370 DEG C and 400 DEG C; the time ranges from 15 minutes to 20 minutes and comprises the end value. The hardness and corrosion resistance of the band saw blade can be reinforced by adopting the band saw blade heat treatment technology.
Description
Technical field
The present invention relates to bands for band processing technology field, more specifically, relate to a kind of bands for band thermal treatment process.
Background technology
Bands for band is that saw blade that is tough and tensile by, that sharp teeth is stretched in the band saw blades formed in a framework, can the larger material of the hardness such as cutting metal.Due to the material that bands for band needs cutting hardness larger, bands for band inherently needs very large hardness, therefore in order to ensure the hardness of bands for band, needs to heat-treat bands for band.
In prior art, conventional bands for band thermal treatment process, often only comprise quenching-tempering twice technique, after above-mentioned technique, there is no other heat treatment step, the bands for band after above-mentioned steps process, its hardness only can reach 900HV0.2, and (HV is Vickers' hardness, 900 is vickers hardness number, and 0.2 is measure load value used, unit kilogram force), cause bands for band to be difficult to the harder material of sawing, have impact on the performance of bands for band.
In sum, the hardness that how can improve bands for band becomes current those skilled in the art technical problem urgently to be resolved hurrily.
Summary of the invention
The object of this invention is to provide a kind of technical scheme of bands for band thermal treatment process, inadequate with the bands for band hardness solving bands for band thermal treatment process process conventional in the prior art introduced in background technology, be difficult to the problem of the larger material of sawing hardness.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
The invention provides a kind of bands for band thermal treatment process, comprise the following steps:
A, preheating: thermal pretreatment is carried out to bands for band, the moisture on cancellation band saw blade surface, wherein, preheating temperature is between 350-400 DEG C (DEG C for degree Celsius) and comprise end value, and warm up time is between 20-40min (min for minute) and comprise end value;
B, salt-bath nitriding: use QPQ (Quench-Polish-Quench, quenching-polishing-quenching) nitridation salt carries out salt Bath Nitriding Treatment to described bands for band surface, with the metal lattice inside making the active nitrogen of described QPQ nitridation salt infiltrate described bands for band, wherein, the temperature of described salt Bath Nitriding Treatment is between 520-580 DEG C and comprise end value, and the salt-bath nitriding time is between 10-180min and comprise end value;
C, liquid oxidizing: use QPQ saline oxide to carry out liquid oxidizing process to described bands for band, decompose described bands for band surface cyanogen root and form oxide film on described bands for band surface, wherein, the temperature of described liquid oxidizing process is between 370-400 DEG C and comprise end value, and the liquid oxidizing time is between 15-20min and comprise end value.
Preferably, after described liquid oxidizing step, also comprise step: D, cleaning of desalting: rinse described bands for band surface 10-20min with water and comprise end value, to remove the remaining QPQ saline oxide in described bands for band surface.
Preferably, after the described cleaning step that desalts, also comprise step: E, oven dry: described bands for band is dried, remove described bands for band remained on surface moisture, bake out temperature is between 120-150 DEG C and comprise end value, and drying time is between 20-50min and comprise end value.
Preferably, after described baking step, also comprise step: F, oiling: smear slushing oil at described bands for band surface uniform, form Rust Preventing Oil Film to make described bands for band surface.
Preferably, in described pre-heating step, well formula resistance furnace is used to carry out thermal pretreatment to described bands for band.
Preferably, in described salt-bath nitriding step, in salt bath, cyanogen radical content comprises end value between 35%-40%.
Preferably, in described liquid oxidizing step, the oxide film that described bands for band surface is formed is Z 250 oxide film.
Preferably, the main component of described QPQ nitridation salt comprises the nitridation salt be made up of high cyanate radical and carbonate using organism and inorganics preparation of raw material, and the main component of described QPQ saline oxide comprises oxygen containing nitrite and/or sodium hydroxide; In the step of liquid oxidizing, if salt bath is rubescent, then in described salt bath, increase QPQ saline oxide, until salt bath redness disappears.
Preferably, described bands for band is bi-metal bandsaw blades, and the composition of the serrated portion of described bi-metal bandsaw blades comprises rapid steel, and the composition of the saw body part of described bi-metal bandsaw blades comprises spring steel.
Preferably, rapid steel is comprised and saw body part comprises the bi-metal bandsaw blades of spring steel if described bands for band is serrated portion, then the temperature of the described salt Bath Nitriding Treatment of described bi-metal bandsaw blades comprises end value between 540-550 DEG C, and the salt-bath nitriding time is between 30-40min and comprise end value; The liquid oxidizing temperature of described bi-metal bandsaw blades is between 380-400 DEG C and comprise end value, and the liquid oxidizing time is between 15-20min and comprise end value.
Can be drawn by above-mentioned working process, bands for band thermal treatment process provided by the invention, by carrying out nitriding treatment in the salt bath of 520-580 DEG C, activated nitrogen atom in QPQ nitridation salt can be made constantly to bands for band surface diffusion, the metal lattice penetrating into bands for band is inner, and finally form compound layer and diffusion layer on bands for band surface, the wear resistance on saw blade surface can be improved, solidity to corrosion and resistance to fatigue, thus enhance the hardness of bands for band, then pass through in the liquid oxidizing process of 370-400 DEG C, the oxide film of black is formed on bands for band surface, the erosion resistance on bands for band surface can be increased, enhance the rustless property of bands for band and the hardness of bands for band simultaneously.To sum up, by carrying out salt-bath nitriding and liquid oxidizing process to bands for band, can the hardness of reinforcing band saw blade, through experimental measurement, hardness through the bands for band of above-mentioned treating processes can reach about 1300HV0.2, relative to the bands for band thermal treatment process of routine, present treatment technique can the hardness of reinforcing band saw blade and the erosion resistance of bands for band.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the first the bands for band thermal treatment process shown in the present invention one exemplary embodiment;
Fig. 2 is the schematic flow sheet of the second bands for band thermal treatment process shown in the present invention one exemplary embodiment.
Embodiment
The bands for band thermal treatment process that the embodiment of the present invention provides, solves the problem that the bands for band hardness of bands for band thermal treatment process production conventional in the prior art introduced in background technology is lower.
Technical scheme in the embodiment of the present invention is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage become apparent more, below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is described in further detail.
Please refer to the schematic flow sheet that accompanying drawing 1, Fig. 1 is the first the bands for band thermal treatment process shown in the present invention one exemplary embodiment.The bands for band thermal treatment process that the embodiment of the present invention provides comprises the following steps:
A, preheating: carry out thermal pretreatment to bands for band, the moisture on cancellation band saw blade surface, wherein, preheating temperature is between 350-400 DEG C and comprise end value, and warm up time is between 20-40min and comprise end value.
The object of preheating is in order to cancellation band saw blade surface contained humidity, prevent from producing sputtering in follow-up salt-bath nitriding and liquid oxidizing technique, bands for band temperature can be improved simultaneously, for follow-up salt-bath nitriding step makes preparation, after preventing colder bands for band from entering stove, salt temperature declines too many, thus reduces the treatment time of salt-bath nitriding, simultaneously, by carrying out preheating to bands for band, also can reduce the distortion of bands for band workpiece and making bands for band color and luster homogeneous, comparatively attractive in appearance.
The present embodiment by bands for band surface preheating 350-400 DEG C, and maintains the time of 20-40min, can retainer belt saw blade surface temperature, removes bands for band surface-moisture as much as possible, and can reduce the deformation of bands for band, improve the gloss of bands for band.
In the pre-heating step of the bands for band of the present embodiment, well formula resistance furnace is used to carry out thermal pretreatment to described bands for band, because well formula resistance furnace furnace temperature is even, good heat insulating, save energy simultaneously, and pollution-free, environmental benefit is good, thus the preheating temperature at each position of bands for band can be made comparatively homogeneous.
B, salt-bath nitriding: use QPQ nitridation salt to carry out nitriding treatment to described bands for band surface, with the metal lattice inside making the active nitrogen in described QPQ nitridation salt infiltrate described bands for band, wherein, the temperature of described salt Bath Nitriding Treatment is between 520-580 DEG C and comprise end value, and the salt-bath nitriding time is between 10-180min and comprise end value.
QPQ nitridation salt comprises cyanogen root, as high cyanate radical, containing nitrogen element in cyanogen root, the object of salt-bath nitriding is to make the cyanogen root in QPQ nitridation salt decompose, thus make to decompose the active nitrogen of generation constantly to bands for band surface diffusion, infiltration from cyanogen root, the metal lattice penetrating into bands for band is inner, finally forms wear resistance and the very high compound layer of corrosion stability and fatigue proof diffusion layer on bands for band surface, thus can improve the wear resistance on bands for band surface, solidity to corrosion and resistance to fatigue.
By carrying out nitriding treatment to bands for band in the high-temperature molten salt bath of 520-580 DEG C, and maintain 10-180min, the activity of active nitrogen can be improved, the active nitrogen in QPQ nitridation salt is made to infiltrate through in the metal lattice of bands for band in a large number, rapidly, thus form compound layer and the diffusion layer of high-compactness on bands for band surface, and then improve wear resistance and the resistance to fatigue on bands for band surface.
Particularly, after bands for band immerses nitrogenize salt bath, the nitrogen that the cyanogen root decomposition in QPQ nitridation salt produces, carbon atom can form high nitrogen gesture and carbon potential on bands for band surface.Because nitrogen-atoms radius is only the half of iron atom radius, and the radius of carbon atom is less, so nitrogen, carbon atom can spread in the dot matrix gap of iron atom, therefore, it is possible to be deep in the metal lattice of bands for band.
The high concentration N on bands for band surface, carbon atom, to bands for band internal divergence, are first formed in the sosoloid in α-Fe.Along with the raising of surface atom concentration, form γ ' (Fe gradually
4n) compound and ε (Fe
2n
3) compound.In bands for band, the concentration gradient of nitrogen, carbon is finally formed centrally by bands for band surface.Diffusion layer organization is compound layer ε phase, ε phase+γ ' phase, γ ' phase, is the sosoloid of nitrogen in α-Fe below compound layer, forms diffusion layer.
Therefore, the workpiece diffusion layer organization skin after QPQ salt Bath Nitriding Treatment is compound layer; Internal layer is diffusion layer.Wherein important with compound layer, it mainly consists of ferric oxide, and it is the Reliable guarantee improving wear resistance, and its corrosion stability is also fine simultaneously.The Main Function of oxide film forms fabulous resist layer together with compound.Simultaneously it is in porous state, can oil storage, reduces friction, favourable to raising wear resistance, also has the effect of aesthetic appeal simultaneously.Diffusion layer Main Function is the fatigue strength improving workpiece, also has very large effect to the bulk strength and elasticity increasing thin thin pieces.
In this step, in liquid oxidizing treating processes, nitriding furnace is used to carry out salt Bath Nitriding Treatment to bands for band.
Wherein, in this salt-bath nitriding process, the cyanogen radical content of salt bath maintains between 35%-40%, needs in the process suitably to add QPQ nitridation salt in salt bath, thus ensures the content of active nitrogen in salt bath, and then ensures the permeating speed of nitriding treatment.After salt Bath Nitriding Treatment work is completed to bands for band, enter into following steps:
C, liquid oxidizing: use QPQ saline oxide to carry out liquid oxidizing process to described bands for band, decompose described bands for band surface cyanogen root and form oxide film on described bands for band surface, wherein, the temperature of described liquid oxidizing process is between 370-400 DEG C and comprise end value, and the liquid oxidizing time is between 15-20min and comprise end value.
The object of liquid oxidizing is the nitridation salt using QPQ saline oxide decomposition bands for band to take out of in nitriding furnace, thus cyanogen root is thoroughly decomposed, and reaches the object of environmental protection.The oxide film of black can be formed on bands for band surface in the process of simultaneously liquid oxidizing, the composition of this oxide film is Z 250, Z 250 has higher antiseptic power, can increase the erosion resistance on the surface of bands for band, and improves the aesthetic property on bands for band surface.
QPQ saline oxide is rich in oxygen element, can carry out chemical reaction with the nitrogen element in QPQ nitridation salt, thus decomposes cyanogen root, reaches and removes cyanogen root, realize the object of environmental protection.By in liquid oxidizing process, maintain the temperature of salt bath at 370-400 DEG C, and maintain the liquid oxidizing time between 15-20min, the decomposition rate of cyanogen root can be accelerated, and make cyanogen root complete decomposition by time controling, make the ferro element in oxygen element and bands for band react simultaneously, form the Z 250 oxide film of black on bands for band surface, improve the erosion resistance on bands for band surface.
In the thermal treatment process of bands for band, the main component of the QPQ nitridation salt that salt-bath nitriding step uses comprises: the nitridation salt be made up of high cyanate radical and carbonate using organism and inorganics preparation of raw material.
QPQ nitridation salt uses the nitridation salt be made up of high cyanate radical and carbonate of organism and inorganics preparation of raw material, compared to the traditional nitridation salt being rich in more highly toxic prussiate comparatively environmental protection.
The main component of the QPQ saline oxide used in liquid oxidizing step comprises oxygen containing nitrite and/or sodium hydroxide; In the step of liquid oxidizing, if salt bath is rubescent, then in described salt bath, increase QPQ saline oxide, until salt bath redness disappears.
Often red-brown is presented containing nitrogen compound, as nitrogen peroxide etc., in liquid oxidizing step, if salt bath rubicundity, illustrate that the nitridation salt in salt bath does not have decomposition completely or by the material neutralized completely as needing, therefore passes through when salt bath rubicundity, appropriate QPQ saline oxide is added in salt bath, thus in and nitridation salt in salt bath, prevent nitridation salt too much, be beneficial to environmental protection.
To sum up, bands for band thermal treatment process in the present embodiment, preheating is carried out to bands for band, salt-bath nitriding, the art breading such as liquid oxidizing, first by carrying out nitriding treatment in the salt bath of 520-580 DEG C, activated nitrogen atom in QPQ nitridation salt can be made constantly to bands for band surface diffusion, the metal lattice penetrating into bands for band is inner, and finally form compound layer and diffusion layer on bands for band surface, improve the wear resistance on saw blade surface, solidity to corrosion and resistance to fatigue, thus enhance the hardness of bands for band, then in the liquid oxidizing process of 370-400 DEG C, bands for band surface is made to form the oxide film of black, the erosion resistance on bands for band surface can be increased, also enhance the rustless property of bands for band and the hardness of bands for band.To sum up, by carrying out salt-bath nitriding and liquid oxidizing process to bands for band, can the hardness of reinforcing band saw blade, through experimental measurement, hardness through the bands for band of above-mentioned treating processes can reach about 1300HV0.2, relative to the bands for band thermal treatment process of routine, present treatment technique can the hardness of reinforcing band saw blade and the erosion resistance of bands for band.
In the bands for band thermal treatment process shown in Fig. 1, before carrying out pre-heating step, also need to carry out quenching Step and tempering step, wherein in quenching Step, quenching temperature controls at 1200 DEG C, and the cool time maintains 50s (second); In tempering step, tempering temperature to control between 520-560 DEG C and comprises end value, needs through 3 temper, and each tempering time maintains 2 hours, thus the hardness improving bands for band in advance reaches about 900HV0.2.
Please refer to Fig. 2, Fig. 2 is the schematic flow sheet of the second bands for band thermal treatment process shown in the present invention one exemplary embodiment, as shown in Figure 2, as a kind of preferred embodiment, except the bands for band thermal treatment process shown in Fig. 1, after the liquid oxidizing step shown in Fig. 1, bands for band thermal treatment process also comprises step: D, cleaning of desalting: rinse described bands for band surface 10-20min with water and comprise end value, to remove the remaining QPQ saline oxide in bands for band surface.
In liquid oxidizing process, the bands for band surface QPQ saline oxide that easily attachment portion is remaining, by with water flushed zone saw blade surface 10-20min, can get rid of the QPQ saline oxide that bands for band surface is remaining.
As shown in Figure 2, after the cleaning step that desalts, also comprising step: E, oven dry: by drying bands for band, removing residual moisture on bands for band, bake out temperature is between 120-150 DEG C and comprise end value, and drying time is between 20-50min and comprise end value.
By drying belt saw blade, bands for band remained on surface moisture can be removed, thus prevent bands for band from getting rusty further, by bands for band bake out temperature is maintained between 120-150 DEG C, and maintain 20-50min, can fully evaporate bands for band surface-moisture, prevent remaining moisture from causing bands for band to get rusty.
As shown in Figure 2, in bands for band thermal treatment process, after a bakeout step, also comprise step: F, oiling: smear slushing oil at bands for band surface uniform, form Rust Preventing Oil Film to make this bands for band surface.
By smearing slushing oil at bands for band surface uniform, Rust Preventing Oil Film can be formed on bands for band surface, thus improve the erosion resistance of bands for band, and by forming Rust Preventing Oil Film on bands for band surface, further in the techniques such as coding process, the corrosion resistance of bands for band can be improved.
In bands for band thermal treatment process in the various embodiments described above, bands for band is bi-metal bandsaw blades, and the composition of the serrated portion of this bi-metal bandsaw blades comprises rapid steel, and the composition of the saw body part of described bi-metal bandsaw blades comprises spring steel.
Bi-metal bandsaw blades serrated portion comprises rapid steel, and saw body part comprises spring steel, can support the use, be applicable to the web for sawing metal comprising the types such as structure iron, steel alloy, bearing steel, stainless steel, die steel, high temperature steel with the band sawing machine of almost any type.
When the bands for band mentioned in above-described embodiment is that serrated portion comprises rapid steel and saw body part comprises the bi-metal bandsaw blades of spring steel, then the salt-bath nitriding temperature of this bi-metal bandsaw blades to maintain between 540-550 DEG C and comprises end value, and salt-bath nitriding time dimension to be held between 30-40min and to comprise end value.By the salt temperature of bi-metal bandsaw blades is maintained between 540-550 DEG C, and salt-bath nitriding time dimension is held between 30-40min, the activity of the nitrogen element in salt bath can be improved, the active nitrogen in QPQ nitridation salt is made to penetrate in the metal lattice of bands for band in a large number, rapidly, thus form compound layer and the diffusion layer of high-compactness rapidly on bands for band surface, and then improve wear resistance and the resistance to fatigue on bands for band surface.
And the liquid oxidizing temperature of bi-metal bandsaw blades to maintain between 380-400 DEG C and comprises end value, liquid oxidizing time dimension to be held between 15-20min and to comprise end value.
The liquid oxidizing temperature of bi-metal bandsaw blades is maintained between 380-400 DEG C, liquid oxidizing time dimension is held between 15-20min, the decomposition rate of cyanogen root can be accelerated, and within this time, make cyanogen root complete decomposition, thus make the ferro element rapid reaction in oxygen element and bands for band, form the oxide film of the Z 250 of the high-compactness of black on bands for band surface, further increase the erosion resistance on bands for band surface.
Each embodiment in this specification sheets all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a bands for band thermal treatment process, is characterized in that, comprises the following steps:
A, preheating: thermal pretreatment is carried out to bands for band, the moisture on cancellation band saw blade surface, wherein, preheating temperature is between 350-400 DEG C and comprise end value, and warm up time is between 20-40min and comprise end value;
B, salt-bath nitriding: use QPQ nitridation salt to carry out salt Bath Nitriding Treatment to described bands for band surface, with the metal lattice inside making the active nitrogen of described QPQ nitridation salt infiltrate described bands for band, wherein, the temperature of described salt Bath Nitriding Treatment is between 520-580 DEG C and comprise end value, and the salt-bath nitriding time is between 10-180min and comprise end value;
C, liquid oxidizing: use QPQ saline oxide to carry out liquid oxidizing process to described bands for band, decompose described bands for band surface cyanogen root and form oxide film on described bands for band surface, wherein, the temperature of described liquid oxidizing process is between 370-400 DEG C and comprise end value, and the liquid oxidizing time is between 15-20min and comprise end value.
2. bands for band thermal treatment process according to claim 1, is characterized in that, after described liquid oxidizing step, also comprises step:
D, cleaning of desalting: rinse described bands for band surface 10-20min with water and comprise end value, to remove the remaining QPQ saline oxide in described bands for band surface.
3. bands for band thermal treatment process according to claim 2, is characterized in that, after the described cleaning step that desalts, also comprises step:
E, oven dry: dry described bands for band, remove described bands for band remained on surface moisture, and bake out temperature is between 120-150 DEG C and comprise end value, and drying time is between 20-50min and comprise end value.
4. bands for band thermal treatment process according to claim 3, is characterized in that, after described baking step, also comprises step:
F, oiling: smear slushing oil at described bands for band surface uniform, form Rust Preventing Oil Film to make described bands for band surface.
5. bands for band thermal treatment process according to claim 1, is characterized in that, in described pre-heating step, uses well formula resistance furnace to carry out thermal pretreatment to described bands for band.
6. bands for band thermal treatment process according to claim 1, is characterized in that, in described salt-bath nitriding step, the cyanogen radical content of salt bath is between 35%-40% and comprise end value.
7. bands for band thermal treatment process according to claim 1, is characterized in that, in described liquid oxidizing step, the oxide film that described bands for band surface is formed is Z 250 oxide film.
8. bands for band thermal treatment process according to claim 1, it is characterized in that, the main component of described QPQ nitridation salt comprises the nitridation salt be made up of high cyanate radical and carbonate using organism and inorganics preparation of raw material, and the main component of described QPQ saline oxide comprises oxygen containing nitrite and/or sodium hydroxide; In the step of described liquid oxidizing, if salt bath is rubescent, then in described salt bath, increase QPQ saline oxide, until salt bath redness disappears.
9. bands for band thermal treatment process according to claim 1, it is characterized in that, described bands for band is bi-metal bandsaw blades, and the composition of the serrated portion of described bi-metal bandsaw blades comprises rapid steel, and the composition of the saw body part of described bi-metal bandsaw blades comprises spring steel.
10. bands for band thermal treatment process according to claim 9, it is characterized in that, rapid steel is comprised and saw body part comprises the bi-metal bandsaw blades of spring steel if described bands for band is serrated portion, then the temperature of the described salt Bath Nitriding Treatment of described bi-metal bandsaw blades comprises end value between 540-550 DEG C, and the salt-bath nitriding time is between 30-40min and comprise end value; The liquid oxidizing temperature of described bi-metal bandsaw blades is between 380-400 DEG C and comprise end value, and the liquid oxidizing time is between 15-20min and comprise end value.
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CN105297125A (en) * | 2015-12-02 | 2016-02-03 | 成都锦汇科技有限公司 | QPQ treatment process applicable to piston ring |
CN105568212A (en) * | 2015-12-17 | 2016-05-11 | 常州大学 | Method for improving salt bath nitridation efficiency by virtue of salt bath preoxidation |
CN106213700A (en) * | 2016-08-31 | 2016-12-14 | 福建浔兴拉链科技股份有限公司 | A kind of production technology of punching press pull head |
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CN105297125A (en) * | 2015-12-02 | 2016-02-03 | 成都锦汇科技有限公司 | QPQ treatment process applicable to piston ring |
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CN110004403A (en) * | 2019-04-23 | 2019-07-12 | 永济市汇越新材料工程技术有限公司 | A kind of compound salt bath ion of rare earth modified multicomponent seeps the modified industry method of processing workpiece |
CN110004403B (en) * | 2019-04-23 | 2020-10-09 | 永济市汇越新材料工程技术有限公司 | Modification industrialization method for rare earth modified multi-component composite salt bath ion infiltration treatment workpiece |
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