CN112792669A - Online dressing method for titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel - Google Patents
Online dressing method for titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel Download PDFInfo
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- 239000002184 metal Substances 0.000 title claims abstract description 46
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 38
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 239000007800 oxidant agent Substances 0.000 claims abstract description 22
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- 239000004094 surface-active agent Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000005069 Extreme pressure additive Substances 0.000 claims abstract description 6
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 6
- 239000013556 antirust agent Substances 0.000 claims abstract description 6
- 230000003197 catalytic effect Effects 0.000 claims abstract description 6
- 239000000314 lubricant Substances 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 3
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 3
- -1 hydroxide ions Chemical class 0.000 claims description 28
- 230000001590 oxidative effect Effects 0.000 claims description 21
- 239000010936 titanium Substances 0.000 claims description 13
- 229910052719 titanium Inorganic materials 0.000 claims description 13
- 239000003574 free electron Substances 0.000 claims description 8
- 238000006479 redox reaction Methods 0.000 claims description 7
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 6
- 150000004692 metal hydroxides Chemical class 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000007146 photocatalysis Methods 0.000 claims description 5
- 230000001699 photocatalysis Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 150000001768 cations Chemical class 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 230000036632 reaction speed Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 238000003754 machining Methods 0.000 abstract description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 24
- 238000009966 trimming Methods 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 4
- 239000007767 bonding agent Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000006061 abrasive grain Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- LCKIEQZJEYYRIY-UHFFFAOYSA-N Titanium ion Chemical compound [Ti+4] LCKIEQZJEYYRIY-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
Abstract
An online dressing method for a titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel comprises the steps of adding a lubricant, an extreme pressure additive, an antirust agent, a defoaming agent and a surfactant into deionized water to obtain a mixed solution, adding titanium oxide into the mixed solution, and preparing a grinding fluid; in the processing process, grinding fluid firstly enters a reaction cavity irradiated by ultraviolet light in a circulating system, two strong oxidants of hydroxyl free radicals and hydrogen peroxide free radicals are generated in the grinding fluid under the catalytic action of the ultraviolet light and titanium oxide, then the strong oxidants are sprayed to the surface of a grinding wheel through a nozzle, and the strong oxidants react with a metal bond of the grinding wheel on the surface of the grinding wheel to generate an oxide layer; in the machining process, the friction force between the workpiece and the grinding wheel removes the oxide layer, so that the worn abrasive particles are easy to fall off, and the new abrasive particles are easy to expose, thereby realizing the on-line sharpening of the metal bond superhard grinding wheel. The invention improves the removal rate of processed materials and the processing efficiency.
Description
Technical Field
The invention relates to the technical field of grinding, in particular to an online dressing method of a titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel
Background
At present, the grinding wheel (diamond grinding wheel, CBN grinding wheel) using the super-hard abrasive is a main tool for precise and efficient grinding processing of hard and brittle materials such as super-hard alloy, semiconductor material, ceramics and the like. The metal bond superhard grinding wheel has the advantages of high hardness, high strength, good profile retentivity of the grinding wheel, good wear resistance and the like, and is widely used for precise and ultra-precise grinding of hard and brittle difficult-to-machine materials. However, the metal bond is very difficult to repair due to the characteristics of high hardness, good wear resistance and the like of the metal bond, and the friction between the grinding wheel and the forming surface of the workpiece completes the removal of materials along with the grinding process, wherein along with the generation of a large amount of heat, a part of heat flows out along with abrasive dust, and most of the heat is remained on the surface of the grinding wheel and the surface of the workpiece. When the hardness of the grinding wheel is high, the holding force of the binding agent on the abrasive particles is high, the tips of the abrasive particles cannot fall off in time after being worn, namely, the self-sharpening performance of the grinding wheel is poor, the chip grooves are blocked, the grinding capacity of the grinding wheel is reduced, grinding burns on the surface of a workpiece and reduction of shape accuracy are caused, and even the workpiece is possibly damaged. Therefore, the dull-ground grinding wheel must be dressed to ensure good cutting performance.
The dressing of the grinding wheel is generally divided into two procedures of shaping and dressing, wherein the shaping refers to the dressing of the grinding wheel, the circle run-out error of the grinding wheel during the rotation of a grinding machine and the unevenness of the surface of a grinding layer along the bus direction of the grinding wheel are reduced, the dressing refers to the fact that abrasive particles are exposed out of the surface of the grinding wheel to form a new cutting edge, and the bonding agent is removed to enable the abrasive particles to have the protruding height exceeding the particle size 1/3, so that the grinding wheel obtains good cutting performance.
The traditional superhard grinding wheel dressing method usually achieves the purpose of dressing by removing abrasive particles through shearing and extrusion, the dressing process is difficult to control, the dressing precision is low, and the grinding wheel loss is large. For this reason, researchers at home and abroad have proposed various trimming methods, such as electrolytic in-process trimming (ELID), Electrochemical in-process controlled trimming (ECD), dry ECD, contact electrical discharge trimming (ECDD), Electrochemical discharge machining (ECDM), Laser-assisted trimming (Laser-assisted trimming and driving), jet pressure trimming (Water-jet in-process trimming), Ultrasonic vibration trimming (Ultrasonic trimming), and the like. With ELID technology being the most typical. Generally, the thickness of the oxide film generated by electrolysis in the ELID grinding process is between tens of microns and hundreds of microns, so that a considerable part of the abrasive is separated from the grinding wheel before the cutting action (abrasion) on the workpiece is not generated, and the ineffective loss of the grinding wheel is increased. In addition, due to the nonlinearity of the electrolytic trimming process, the cutting force is unstable due to the damage of the insulating layer on the surface of the grinding wheel in the ELID grinding process, and the shearing force rises and falls suddenly; when the electrolytic current is small, the formation and destruction processes of the electrolytic layer are long, making the cutting force unstable. When the current is large, the grinding wheel is excessively dressed, and the loss is excessive. Meanwhile, a special electrolysis power supply and an electrode system are needed, the equipment is complex, and the use cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an online dressing method of a titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel, which improves the removal rate of processed materials and the processing efficiency.
In order to solve the technical problems, the invention provides the following technical scheme:
in the mixed solution, 15-20% by volume of the lubricant, 2-5% by volume of the extreme pressure additive, 3-5% by volume of the antirust agent, 1% by volume of the defoaming agent, 1% by volume of the surfactant and 3-5% by volume of the surfactant are added; adding titanium oxide into the mixed solution to prepare a grinding fluid, wherein the titanium oxide accounts for 3-6% of the total mass of the grinding fluid; the grinding fluid passes through an ultraviolet irradiation cavity in a circulating system, and hydroxyl radicals with strong oxidizability are generated in the grinding fluid under the catalytic action of ultraviolet light and titanium oxide; the grinding fluid with strong oxidizing property is sprayed to the surface of the grinding wheel by a nozzle and is subjected to oxidation reaction with a metal bond on the surface of the grinding wheel to form an oxide layer; the oxide layer is removed under the action of friction force between the grinding wheel and the workpiece, so that the passivated abrasive particles gradually fall off, new abrasive particles are exposed out of the surface of the grinding wheel, and the online sharpening of the metal bond superhard grinding wheel is completed, so that the grinding performance of the grinding wheel is maintained, and the high-quality grinding of the workpiece is realized.
Furthermore, the grinding wheel is a metal bond superhard grinding wheel, a strong oxidant hydroxyl radical and a hydrogen peroxide radical generated by photocatalysis in the grinding process oxidize the metal bond of the grinding wheel to obtain an oxide layer, the generation mechanism is as follows, and the wavelength of water decomposed by ultraviolet light is increased from 165nm to 380nm under the catalysis of titanium oxide. When the titanium oxide is exposed to ultraviolet rays, a pair of free electrons and positive holes are firstly generated, and the positive holes are then reacted with hydroxide ions adsorbed on the surface of the titanium oxide to generate hydroxyl radicals; on the other hand, the free electrons reduce tetravalent titanium ions into trivalent titanium ions, then the trivalent titanium ions give an electron to oxygen molecules adsorbed on the surface of titanium oxide, and the generated superoxide ions are combined with hydrogen ions to form another radical hydrogen peroxide radical; in this way, the two radicals generated oxidize the metal bond of the grinding wheel to the oxide layer.
Further, after the grinding fluid is sprayed to the surface of the grinding wheel, hydroxyl radicals and hydrogen peroxide radicals and a metal binding agent generate oxidation-reduction reaction; hydroxyl radicals and hydrogen peroxide radicals deprive electrons of metal simple substances to obtain metal cations and hydroxide ions, and metal hydroxide is generated; the metal hydroxide is precipitated and oxidized on the surface of the grinding wheel to form a non-conductive oxide layer, and the oxidation layer generated is more compact as the oxidation-reduction reaction speed is higher, and is more loose.
Still further, the speed and thickness of oxide film formation can directly influence the surface quality after grinding, and the speed and thickness of oxide film formation can be controlled by adjusting the intensity of ultraviolet light to change the rate of oxidant formation.
Furthermore, the grinding wheel bonding agent is oxidized by the strong oxidant generated after photocatalysis, the strong oxidant is generated in the reaction cavity, the strong oxidant is pumped out by the centrifugal pump and sprayed to the surface of the grinding wheel, and the oxide layer formed by the strong oxidant and the grinding wheel metal bonding agent can be controlled by controlling the flow of the sprayed grinding fluid.
The invention has the following beneficial effects:
1) the online dressing method of the metal bond superhard grinding wheel assisted by the titanium oxide photocatalyst greatly improves the removal rate of the processed material and the processing efficiency.
2) The thicker oxide layer formed in the machining process can play a role of a polishing pad, on one hand, the thicker oxide layer serves as a buffer and can absorb radial vibration generated in the grinding process to improve the quality of a machined surface, and on the other hand, the thicker oxide layer can prevent the grinding wheel from being excessively worn.
Drawings
FIG. 1 is a schematic illustration of the grinding process of the present invention;
FIG. 2 is a schematic view of the processing principle of the present invention;
FIG. 3 is a schematic diagram of the reaction principle of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1-3, a method for dressing a superhard grinding wheel with a titanium oxide photocatalyst auxiliary metal binder on line, a workpiece 2 is fixed on a magnetic suction base 1; the magnetic suction base 1 translates left and right to enable the workpiece 1 and the grinding wheel 3 to move relatively; the grinding wheel 3 rotates at a high speed for grinding, and can feed up and down to control the processing depth; the grinding fluid 9 is filled in a container 11 and is pumped into the reaction cavity 8 by a pump 9; the ultraviolet light emitter 6 is arranged above the reaction cavity 8, and the light intensity is adjustable; after the grinding fluid 9 enters the reaction cavity, the surface layer grinding fluid is irradiated by ultraviolet light and is subjected to catalytic reaction by titanium oxide to obtain a strong oxidant; the pump 5 pumps the polishing solution after reaction at the upper layer in the reaction cavity 8 through the floating platform 7 and then sprays the polishing solution onto the grinding wheel 3 through the nozzle 4.
Adding a lubricant, an extreme pressure additive, an antirust agent, a defoaming agent and a surfactant into deionized water to obtain a mixed solution, wherein in the mixed solution, the volume percentage of the lubricant is 15-20%, the volume percentage of the extreme pressure additive is 2-5%, the volume percentage of the antirust agent is 3-5%, the volume percentage of the defoaming agent is 1%, the volume percentage of the surfactant is 1%, and the volume percentage of the surfactant is 3-5%; adding titanium oxide into the mixed solution to prepare a grinding fluid, wherein the titanium oxide accounts for 3-6% of the total mass of the grinding fluid; the grinding fluid passes through an ultraviolet irradiation cavity in a circulating system, and hydroxyl radicals with strong oxidizability are generated in the grinding fluid under the catalytic action of ultraviolet light and titanium oxide; the grinding fluid with strong oxidizing property is sprayed to the surface of the grinding wheel 3 through a nozzle and is subjected to oxidation reaction with the metal bond on the surface of the grinding wheel 1 to form an oxide layer; the oxide layer is removed under the action of the friction force between the grinding wheel 3 and the workpiece 2, so that the passivated abrasive particles gradually fall off, new abrasive particles are exposed out of the surface of the grinding wheel, and the online dressing of the metal bond superhard grinding wheel is completed, thereby maintaining the grinding performance of the grinding wheel 3 and realizing the high-quality grinding of the workpiece.
Further, the grinding wheel 3 is a metal bond superhard grinding wheel, and a strong oxidant hydroxyl radical and a hydrogen peroxide radical generated by photocatalysis in the grinding process oxidize the metal bond of the grinding wheel to obtain an oxide layer. The generation mechanism is that under the catalytic action of titanium oxide, the wavelength of water decomposed by ultraviolet light is increased from 165nm to 380 nm. When the titanium oxide is exposed to ultraviolet rays, a pair of free electrons and positive holes are firstly generated, and the positive holes are then reacted with hydroxide ions adsorbed on the surface of the titanium oxide to generate hydroxyl radicals; on the other hand, the free electrons reduce tetravalent titanium ions to trivalent titanium ions. Then, the trivalent titanium ion gives an electron to the oxygen molecule adsorbed on the surface of the titanium oxide, and the generated superoxide ion is combined with hydrogen ion to form another radical, namely hydrogen peroxide radical; in this way, the two radicals generated oxidize the metal bond of the grinding wheel to the oxide layer.
Further, after the grinding fluid is sprayed to the surface of the grinding wheel, hydroxyl radicals and hydrogen peroxide radicals and a metal bond undergo oxidation-reduction reaction; hydroxyl radicals and hydrogen peroxide radicals deprive electrons of metal simple substances to obtain metal cations and hydroxide ions, and metal hydroxide is generated; the metal hydroxide is precipitated and oxidized on the surface of the grinding wheel to form a non-conductive oxide layer, and the oxidation layer generated is more compact as the oxidation-reduction reaction speed is higher, and is more loose.
Still further, the speed and thickness of oxide film formation can directly influence the surface quality after grinding, and the speed and thickness of oxide film formation can be controlled by adjusting the intensity of ultraviolet light to change the rate of oxidant formation.
Furthermore, the grinding wheel binder is oxidized by a strong oxidant generated after photocatalysis. The strong oxidant is generated in the reaction cavity, is pumped out by a centrifugal pump and is sprayed to the surface of the grinding wheel, and the strong oxidant and the metal bond of the grinding wheel form an oxide layer, so that the forming rate and the thickness of the oxide layer can be controlled by controlling the flow of the sprayed grinding fluid.
Referring to fig. 2, as grinding progresses, the abrasive grains on the surface of the grinding wheel are broken and passivated abrasive grains 13 appear; the grinding fluid 14 with strong oxidizer is sprayed on the surface of the grinding wheel to oxidize the metal bond 15 of the grinding wheel to generate an oxide layer 12; as the soft oxide layer is removed by the friction between the grinding wheel and the workpiece, the passivated abrasive particles 13 fall off, and the new abrasive particles 16 are exposed to realize the online sharpening of the metal bond superhard grinding wheel.
Referring to fig. 3, titanium oxide molecules 18, water molecules 23, tetravalent titanium ions 29 and oxygen molecules 17 in the grinding fluid undergo redox reaction under the irradiation of ultraviolet light 22; the titanium oxide molecules 18 first generate a pair of free electrons and positive holes under the irradiation of the ultraviolet rays 22, and the positive holes then react with the hydroxide ions decomposed from water to generate hydroxyl radicals 20. In addition, the free electrons reduce tetravalent titanium ions to trivalent titanium ions, and then the trivalent titanium ions will deprive oxygen molecules 21 of one electron to change into tetravalent titanium ions 19 again, and the oxygen molecules losing one electron combine with the hydrogen ions decomposed from water to form hydrogen peroxide radicals 17.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (5)
1. An online dressing method of a titanium oxide photocatalyst auxiliary metal bond superhard grinding wheel is characterized in that a mixed solution is obtained by adding a lubricant, an extreme pressure additive, an antirust agent, a defoaming agent and a surfactant into deionized water, wherein in the mixed solution, the volume percentage of the lubricant is 15-20%, the volume percentage of the extreme pressure additive is 2-5%, the volume percentage of the antirust agent is 3-5%, the volume percentage of the defoaming agent is 1%, the volume percentage of the surfactant is 1%, and the volume percentage of the surfactant is 3-5%; adding titanium oxide into the mixed solution to prepare a grinding fluid, wherein the titanium oxide accounts for 3-6% of the total mass of the grinding fluid; the grinding fluid passes through an ultraviolet irradiation cavity in a circulating system, and hydroxyl radicals with strong oxidizability are generated in the grinding fluid under the catalytic action of ultraviolet light and titanium oxide; the grinding fluid with strong oxidizing property is sprayed to the surface of the grinding wheel by a nozzle and is subjected to oxidation reaction with a metal bond on the surface of the grinding wheel to form an oxide layer; the oxide layer is removed under the action of friction force between the grinding wheel and the workpiece, so that the passivated abrasive particles gradually fall off, new abrasive particles are exposed out of the surface of the grinding wheel, and the online sharpening of the metal bond superhard grinding wheel is completed, so that the grinding performance of the grinding wheel is maintained, and the high-quality grinding of the workpiece is realized.
2. The method for dressing a metal bond superhard grinding wheel on line with the assistance of the titanium oxide photocatalyst as claimed in claim 1, wherein the grinding wheel is a metal bond superhard grinding wheel, and a strong oxidant hydroxyl radical and a hydrogen peroxide radical generated by photocatalysis in the grinding process oxidize the metal bond of the grinding wheel to obtain an oxide layer, wherein the generation mechanism is that under the catalytic action of titanium oxide, the wavelength of water decomposed by ultraviolet light is increased from 165nm to 380 nm; when the titanium oxide is exposed to ultraviolet rays, a pair of free electrons and positive holes are firstly generated, and the positive holes are then reacted with hydroxide ions adsorbed on the surface of the titanium oxide to generate hydroxyl radicals; on the other hand, the free electrons reduce tetravalent titanium ions into trivalent titanium ions, then the trivalent titanium ions give an electron to oxygen molecules adsorbed on the surface of titanium oxide, and the generated superoxide ions are combined with hydrogen ions to form another radical hydrogen peroxide radical; in this way, the two radicals generated oxidize the metal bond of the grinding wheel to the oxide layer.
3. The method for dressing a superhard grinding wheel with a metal bond by the aid of a titanium oxide photocatalyst in an online manner according to claim 1 or 2, wherein after the grinding fluid is sprayed on the surface of the grinding wheel, hydroxyl radicals and hydrogen peroxide radicals undergo an oxidation-reduction reaction with the metal bond; hydroxyl radicals and hydrogen peroxide radicals deprive electrons of metal simple substances to obtain metal cations and hydroxide ions, and metal hydroxide is generated; the metal hydroxide is precipitated and oxidized on the surface of the grinding wheel to form a non-conductive oxide layer, and the oxidation layer generated is more compact as the oxidation-reduction reaction speed is higher, and is more loose.
4. The method for dressing a superhard grinding wheel with a titanium oxide photocatalyst auxiliary metal bond in an online manner as claimed in claim 1 or 2, wherein the forming speed and thickness of the oxide film are controlled by adjusting the intensity of ultraviolet light to change the forming speed of the oxidant.
5. The method for on-line dressing of a metal bond superhard grinding wheel with the aid of the titanium oxide photocatalyst as claimed in claim 1 or 2, wherein the grinding wheel bond is oxidized by a strong oxidant generated after the photocatalyst, the strong oxidant is generated in the reaction chamber, the strong oxidant is pumped out by a centrifugal pump and sprayed on the surface of the grinding wheel, and the strong oxidant and the grinding wheel metal bond form an oxide layer, so that the forming rate and the thickness of the oxide layer can be controlled by controlling the flow of the sprayed grinding fluid.
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