CN112720263A - Online dressing method for spraying strong-oxidizing grinding fluid to surface of super-hard abrasive particle metal bond grinding wheel - Google Patents

Online dressing method for spraying strong-oxidizing grinding fluid to surface of super-hard abrasive particle metal bond grinding wheel Download PDF

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Publication number
CN112720263A
CN112720263A CN202110003435.1A CN202110003435A CN112720263A CN 112720263 A CN112720263 A CN 112720263A CN 202110003435 A CN202110003435 A CN 202110003435A CN 112720263 A CN112720263 A CN 112720263A
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grinding
grinding fluid
fluid
oxidizing
grinding wheel
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CN112720263B (en
Inventor
吕冰海
段世祥
傅琳
祝佳俊
杨居儒
邵蓝樱
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12Dressing tools; Holders therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00Abrasive blasting machines or devices; Plants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00Devices or accessories for generating abrasive blasts
    • B24C5/02Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04Nozzles therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0007Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24CABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/006Treatment of used abrasive material

Abstract

An on-line dressing method for spraying a strong oxidizing grinding fluid to the surface of a superhard abrasive grain metal bond grinding wheel comprises the steps of preparing the grinding fluid, adding a polishing fluid into a grinding fluid groove in an external grinding fluid circulating system of a grinding machine, injecting the grinding fluid into a mixing groove through a vane pump, mixing the grinding fluid with an oxidant in the mixing groove, mixing the oxidant with ozone and thiosulfate to form the oxidant, enabling the thiosulfate to enable the ozone to quickly generate hydroxyl radicals, mixing the hydroxyl radicals in the grinding fluid to form the strong oxidizing grinding fluid, spraying the strong oxidizing grinding fluid to the surface of the superhard abrasive grain metal bond grinding wheel through a pressure pump, oxidizing the metal bond on the surface of the grinding wheel by the strong oxidizing grinding fluid to form an oxide layer, and simultaneously slowing down and preventing further oxidation to avoid excessive wear of the grinding wheel. The invention solves the problem that the subsequent grinding effect is poor due to the formation of a hard layer on the surface of the grinding wheel during the electric spark method trimming at present.

Description

Online dressing method for spraying strong-oxidizing grinding fluid to surface of super-hard abrasive particle metal bond grinding wheel
Technical Field
The invention relates to the technical field of grinding, in particular to an on-line dressing method for spraying strong-oxidizing grinding fluid to the surface of a superhard abrasive particle metal bond grinding wheel.
Background
The superhard abrasive material has been generally applied in the field of machining due to extremely high hardness and wear resistance, in the grinding process, because the holding force of a superhard abrasive particle grinding wheel bonding agent on abrasive particles is large, the abrasive particles cannot fall off in time after being worn, a chip pocket is blocked, and the grinding performance of the grinding wheel is reduced, the grinding wheel must be trimmed in order to achieve good grinding performance, shaping and dressing are two procedures of grinding wheel trimming, shaping means rounding the appearance of the grinding wheel, the jumping occurring in the grinding process of the grinding wheel is reduced, dressing means that the abrasive particles appear on the surface of the grinding wheel, a new cutting edge is generated, and the grinding wheel obtains good cutting performance.
But compared with the common grinding wheel, the superhard grinding wheel is difficult to trim, the force required by the superhard grinding wheel is large, the trimming tool is fast in abrasion, the trimming time is long, the trimming efficiency is low, the trimming precision is poor, and the trimming effect is poor. The present stage of the superhard grinding wheel correction technology comprises the following steps: turning, rolling, braking, elastic, electrolytic, etc.
For a metal bond grinding wheel, the metal bond has high strength and good conductivity, when the requirements of large allowance removal and complex profile dressing are met, electric spark discharge dressing (ECDD) is commonly used, the electric spark dressing efficiency is high, but a hard layer is generated by the electric spark dressing to influence the grinding effect, when the requirements of small allowance dressing are met, a common grinding tool grinding method is usually adopted, but the common grinding tool grinding method has low efficiency and quick abrasion. The on-line electrolytic dressing (Electronic in-process dressing, ELID) is an advanced dressing technology, in the grinding process, electrolyte is introduced between the grinding wheel and the electrode, an anodic dissolution effect is generated under the action of current, the metal bond on the surface of the grinding wheel is electrolytically removed to expose sharp abrasive particles, and meanwhile, the generated oxide film can slow down further electrolysis with the tissue, so that the excessive fast wear of the grinding wheel is avoided, but the on-line electrolytic dressing technology is not suitable for dressing coarse-grained grinding wheels.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an online dressing method for spraying a strong oxidizing grinding fluid to the surface of a superhard abrasive particle metal bond grinding wheel.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an on-line dressing method for spraying a strong oxidizing grinding fluid to the surface of a superhard abrasive particle metal bond grinding wheel is characterized in that deionized water, a lubricant, an extreme pressure additive, an antirust agent, a mildew-proof additive, a defoaming agent and a surfactant are adopted to prepare the grinding fluid in proportion, and then an oxidant is added to prepare the strong oxidizing grinding fluid; after the grinding fluid is prepared, the polishing fluid is added into a grinding fluid groove in an external grinding fluid circulating system of a grinding machine, the grinding fluid is injected into a mixing tank through a vane pump, the grinding fluid can be mixed with an oxidant in the mixing tank, the oxidant is formed by mixing ozone and thiosulfate, the thiosulfate enables the ozone to quickly generate hydroxyl radicals and mix the hydroxyl radicals in the grinding fluid to form strong oxidizing grinding fluid, then the strong oxidizing grinding fluid is sprayed on the surface of the superhard abrasive particle metal bond grinding wheel through a pressure pump, the strong oxidizing grinding fluid oxidizes the metal bond on the surface of the grinding wheel to form an oxide layer, meanwhile, the oxide layer can slow down and prevent further oxidation, and the excessive high-speed grinding wheel loss is avoided.
Furthermore, the grinding fluid flows out of the processing area and then enters the circulating system again, waste materials generated in the grinding process are filtered and removed through a filtering device in the circulating system and then enter a grinding fluid groove, the waste materials are pressurized through a vane pump and then enter a mixing groove again, the waste materials are sprayed on the surface of the grinding wheel again through a pressurizing pump, and then the circulation is repeated, so that the online sharpening of the superhard abrasive particle metal bond grinding wheel is realized.
Furthermore, the lubricant is composed of compounds such as animal and vegetable oil, polyolefin oil or amines, and the like, and the volume percentage content of the lubricant in the grinding fluid is 15-20%; the extreme pressure additive consists of organic compounds such as sulfur, chlorine, phosphorus and the like and organic metal compounds, and the volume percentage content of the extreme pressure additive in the grinding fluid is 3-5%; the antirust agent consists of inorganic salt or organic salt, and the volume percentage content of the antirust agent in the grinding fluid is 5 percent; the mildew-proof additive consists of a mixture of amines and phenols, and the volume percentage content of the mildew-proof additive in the grinding fluid is 1%; the defoaming agent consists of higher alcohols, ketones or silicone oil emulsion, and the volume percentage content of the defoaming agent in the grinding fluid is 1 percent; the surfactant is composed of fatty acid derivatives, thiol ester, sulfonic acid or carboxyl amide, and the volume percentage of the surfactant in the grinding fluid is 3-5%.
Still further, the oxidant is composed of ozone and thiosulfate, and the ratio of ozone: the volume percentage of the thiosulfate is 10:3-5, and after the grinding fluid enters the mixing tank, the grinding fluid and the oxidant are mixed to prepare the strong-oxidizing grinding fluid.
The invention has the following beneficial effects: 1. compared with the technology of online dressing the grinding wheel by electric sparks, the method is simple to operate, a hard layer cannot be generated to influence the grinding effect, and meanwhile, the generated oxide layer can slow down and prevent further oxidation, so that the condition that the grinding wheel is too fast in loss is avoided. 2. The method can be formed by modification on a common grinding machine, only an external circulating device needs to be installed, and the modification is convenient and simple. 3. The oxidant used in the method can be used in neutral, alkaline and acidic environments, has no risk of secondary pollution to the environment, and is beneficial to industrial application.
Drawings
Fig. 1 is a schematic view of the grinding process of the present invention.
FIG. 2 is a schematic view of the processing principle of the present invention.
In the figure: 1. the grinding machine 2, the workpiece 3, the superhard abrasive particle metal bond grinding wheel 4, the spray head 5, the vane pump 6, the grinding fluid 7, the grinding fluid tank 8, the filtering device 9, the motor 10, the stirring rod 11, the mixing tank 12, the feed inlet 13, the flow valve 14, the ozone generator 15, the pressure pump 16, the metal bond 17, the old abrasive particles 18, the oxidation layer 19 and the new abrasive particles.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, an on-line dressing method for spraying a strong oxidizing grinding fluid to the surface of a superhard abrasive particle metal bond grinding wheel is characterized in that deionized water, a lubricant, an extreme pressure additive, an antirust agent, a mildew-proof additive, a defoaming agent and a surfactant are adopted to prepare the grinding fluid in proportion, and then an oxidant is added to prepare the strong oxidizing grinding fluid; after the grinding fluid is prepared, the polishing fluid is added into a grinding fluid groove in an external grinding fluid circulating system of a grinding machine, the grinding fluid is injected into a mixing tank through a vane pump, the grinding fluid can be mixed with an oxidant in the mixing tank, the oxidant is formed by mixing ozone and thiosulfate, the thiosulfate enables the ozone to quickly generate hydroxyl radicals and mix the hydroxyl radicals in the grinding fluid to form strong oxidizing grinding fluid, then the strong oxidizing grinding fluid is sprayed on the surface of the superhard abrasive particle metal bond grinding wheel through a pressure pump, the strong oxidizing grinding fluid oxidizes the metal bond on the surface of the grinding wheel to form an oxide layer, meanwhile, the oxide layer can slow down and prevent further oxidation, and the excessive high-speed grinding wheel loss is avoided.
Furthermore, the grinding fluid flows out of the processing area and then enters the circulating system again, waste materials generated in the grinding process are filtered and removed through a filtering device in the circulating system and then enter a grinding fluid groove, the waste materials are pressurized through a vane pump and then enter a mixing groove again, the waste materials are sprayed on the surface of the grinding wheel again through a pressurizing pump, and then the circulation is repeated, so that the online sharpening of the superhard abrasive particle metal bond grinding wheel is realized.
Furthermore, the lubricant is composed of compounds such as animal and vegetable oil, polyolefin oil or amines, and the like, and the volume percentage content of the lubricant in the grinding fluid is 15-20%; the extreme pressure additive consists of organic compounds such as sulfur, chlorine, phosphorus and the like and organic metal compounds, and the volume percentage content of the extreme pressure additive in the grinding fluid is 3-5%; the antirust agent consists of inorganic salt or organic salt, and the volume percentage content of the antirust agent in the grinding fluid is 5 percent; the mildew-proof additive consists of a mixture of amines and phenols, and the volume percentage content of the mildew-proof additive in the grinding fluid is 1%; the defoaming agent consists of higher alcohols, ketones or silicone oil emulsion, and the volume percentage content of the defoaming agent in the grinding fluid is 1 percent; the surfactant is composed of fatty acid derivatives, thiol ester, sulfonic acid or carboxyl amide, and the volume percentage of the surfactant in the grinding fluid is 3-5%.
Still further, the oxidant is composed of ozone and thiosulfate, and the ratio of ozone: the volume percentage of the thiosulfate is 10:3-5, and after the grinding fluid enters the mixing tank, the grinding fluid and the oxidant are mixed to prepare the strong-oxidizing grinding fluid.
In this example, the grinding process is as follows, and the lubricant, the extreme pressure additive, the rust inhibitor, the mildew-proof additive, the antifoaming agent, the surfactant, and the deionized water are mixed in a volume ratio of 20: 5: 5: 1: 1: 1: 3: 65 mixing and preparing the grinding fluid 6, pouring the prepared grinding fluid 6 into a grinding fluid tank 7, then pumping the grinding fluid 6 into a feeding tank 11 by a vane pump 5, wherein ozone is generated by an ozone generator 14 in the feeding tank and enters the mixing tank through a flow valve 13, and simultaneously, manually adding a proper amount of sodium thiosulfate through a feeding port 12, wherein the volume ratio of the ozone passing through the flow valve 13 to the added sodium thiosulfate is calculated to be 2: 1. then ozone and sodium thiosulfate react in the grinding fluid to generate hydroxyl radicals so that the grinding fluid becomes strong in oxidizing property, meanwhile, a motor 9 in a mixing tank drives a stirring rod 10 to rotate so that an oxidizing agent and the grinding fluid are uniformly fused, then the strong oxidizing grinding fluid is sprayed on the surface of the cast iron-based diamond grinding wheel 3 from a nozzle 4 through a pressure pump 15, the hydroxyl radicals in the strong oxidizing grinding fluid oxidize the surface of the cast iron-based diamond grinding wheel 3 to form ferric hydroxide and ferrous hydroxide, then the ferric hydroxide and the ferrous hydroxide are precipitated to form an oxide layer 18, then the cast iron-based diamond grinding wheel 3 is in contact with a workpiece 2, the oxide layer 18 is gradually slowed down and further oxidized by organization along with the grinding process, the condition that the cast iron-based diamond grinding wheel 3 is too fast in loss is avoided, and meanwhile, after the cutting height is reduced along with the abrasion of abrasive particles 17 on the surface of the metal bond grinding wheel 3, the oxide layer 18 is thinned and new abrasive particles 19, the surface of the cast iron-based diamond grinding wheel 3 is continuously oxidized with the thinning of the oxidation film by the oxidant, so that the online sharpening of the cast iron-based diamond grinding wheel 3 is realized. The strongly oxidizing grinding fluid is then passed through a filter device 8 to filter off the debris produced during grinding, returned to the grinding fluid tank 7 and the process repeated, but without the need for further ozone and sodium thiosulfate.
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 (4)

1. An on-line dressing method for spraying a strong-oxidizing grinding fluid to the surface of a superhard abrasive particle metal bond grinding wheel is characterized in that the grinding fluid is prepared by adopting deionized water, a lubricant, an extreme pressure additive, an antirust agent, a mildew-proof additive, a defoaming agent and a surfactant according to a proportion, and then an oxidant is added to prepare the strong-oxidizing grinding fluid; after the grinding fluid is prepared, the polishing fluid is added into a grinding fluid groove in an external grinding fluid circulating system of a grinding machine, the grinding fluid is injected into a mixing tank through a vane pump, the grinding fluid can be mixed with an oxidant in the mixing tank, the oxidant is formed by mixing ozone and thiosulfate, the thiosulfate enables the ozone to quickly generate hydroxyl radicals and mix the hydroxyl radicals in the grinding fluid to form strong oxidizing grinding fluid, then the strong oxidizing grinding fluid is sprayed on the surface of the superhard abrasive particle metal bond grinding wheel through a pressure pump, the strong oxidizing grinding fluid oxidizes the metal bond on the surface of the grinding wheel to form an oxide layer, meanwhile, the oxide layer can slow down and prevent further oxidation, and the excessive high-speed grinding wheel loss is avoided.
2. The method for on-line dressing of the surface of a superabrasive particle-metal bonded grinding wheel according to claim 1, wherein the grinding fluid flows out from the machining area and enters the circulation system again, the waste generated during the grinding process is filtered and removed by the filter device in the circulation system and enters the grinding fluid tank, the waste is pressurized by the vane pump and enters the mixing tank again, the waste is sprayed on the surface of the grinding wheel again by the pressure pump, and the circulation is repeated to realize the on-line dressing of the superabrasive particle-metal bonded grinding wheel.
3. The method for on-line dressing of the surface of a super-abrasive grain metal bond grinding wheel by spraying a strong oxidizing grinding fluid according to claim 1 or 2, wherein the lubricant is composed of compounds such as animal and vegetable oils, polyolefin oil or amines, and the volume percentage of the lubricant in the grinding fluid is 15-20%; the extreme pressure additive consists of organic compounds such as sulfur, chlorine, phosphorus and the like and organic metal compounds, and the volume percentage content of the extreme pressure additive in the grinding fluid is 3-5%; the antirust agent consists of inorganic salt or organic salt, and the volume percentage content of the antirust agent in the grinding fluid is 5 percent; the mildew-proof additive consists of a mixture of amines and phenols, and the volume percentage content of the mildew-proof additive in the grinding fluid is 1%; the defoaming agent consists of higher alcohols, ketones or silicone oil emulsion, and the volume percentage content of the defoaming agent in the grinding fluid is 1 percent; the surfactant is composed of fatty acid derivatives, thiol ester, sulfonic acid or carboxyl amide, and the volume percentage of the surfactant in the grinding fluid is 3-5%.
4. The method of on-line dressing of a superabrasive bonded metallic bond wheel surface with a strongly oxidizing grinding fluid according to claim 3 wherein the oxidizing agent is ozone and thiosulfate, ozone: the volume percentage of the thiosulfate is 10:3-5, and after the grinding fluid enters the mixing tank, the grinding fluid and the oxidant are mixed to prepare the strong-oxidizing grinding fluid.
CN202110003435.1A 2021-01-04 2021-01-04 Online dressing method for spraying strong-oxidizing grinding fluid to surface of super-hard abrasive particle metal bond grinding wheel Active CN112720263B (en)

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