CN111906702A - Preparation method of environment-friendly double-end-face grinding disc for processing piston ring - Google Patents
Preparation method of environment-friendly double-end-face grinding disc for processing piston ring Download PDFInfo
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- CN111906702A CN111906702A CN202010682540.8A CN202010682540A CN111906702A CN 111906702 A CN111906702 A CN 111906702A CN 202010682540 A CN202010682540 A CN 202010682540A CN 111906702 A CN111906702 A CN 111906702A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
- B24D3/285—Reaction products obtained from aldehydes or ketones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention provides a preparation method of an environment-friendly double-end-face grinding disc for piston ring processing, which comprises the following raw material formula in percentage by mass: 16.7-21.8% of resin powder, 40.6-54% of CBN, 19-25% of corundum (aluminum oxide), 2.2-4% of carbon powder, 4.4-6.5% of copper powder, 1.4-1.8% of calcium oxide powder and 1.2-1.8% of cryolite. The invention relates to a resin double-end-face grinding disc which is specially designed for replacing a common corundum grinding disc to process a piston ring. The grinding disc is more environment-friendly in use, and does not generate a large amount of dust and powder waste like a common corundum grinding disc, so that the pollution to the environment is reduced; the loss is low, and the grinding disc does not need to be frequently replaced like a common corundum grinding disc, so that the production efficiency is improved, and the labor cost is reduced; long service life and high performance/price ratio.
Description
The invention relates to an environment-friendly double-end-face grinding disc for processing piston rings, a preparation method and application thereof, and a divisional application with the application number of 2018113687335 and the application date of 2018, 11 and 16, which is part of a product preparation method.
Technical Field
The invention belongs to the technical field of grinding processing, and relates to an environment-friendly double-end-face grinding disc for processing a piston ring by replacing a common grinding wheel and a preparation method thereof.
Background
Internal combustion engines are widely used in the fields of automobiles, aviation, machinery, and the like as an important power plant. With rapid development of technology and economy, the demand for internal combustion engines is also increasing continuously. Piston rings are used in ever increasing amounts as one of the most important parts of internal combustion engines. The end face machining of the piston ring at present depends on a common corundum double-end-face grinding disc, and the machining mode not only needs frequent finishing, but also causes short service life of the grinding wheel and low machining efficiency; and a large amount of waste residues are generated in the use of the ordinary corundum end face grinding disc, so that the environmental pollution is caused. Aiming at the current situations, a new superhard double-end-face millstone with long service life, high processing efficiency and small environmental pollution is urgently needed to be developed.
At present, the technical introduction of the superhard double-end-face grinding disc for processing the piston by replacing the conventional common corundum grinding wheel is not provided, the common grinding wheel is sharper than the superhard grinding wheel, the problems of poor sharpness, short service life, workpiece burning deformation and the like of the grinding wheel often occur when the conventional superhard grinding wheel replaces the common grinding wheel, and particularly, a pair of double-end-face grinding discs are required to process piston rings with different hardness of several materials, so that the difficulty of the formula design of the conventional superhard double-end-face grinding disc is obviously increased. Therefore, aiming at the current market and the technical requirements, the design of the environment-friendly double-end-face grinding disc for replacing the common grinding wheel to process the piston ring is very eager.
Disclosure of Invention
The invention aims to provide an environment-friendly resin double-end-face grinding disc and a preparation method thereof, wherein the environment-friendly resin double-end-face grinding disc can be used for processing piston rings with different materials and hardness, meets the requirement on surface processing quality, and simultaneously can ensure the processing efficiency and the service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an environment-friendly double-end-face grinding disc for piston ring processing comprises the following steps:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a mold, and carrying out hot pressing and sintering to obtain a grinding layer block;
(3) bonding the grinding layer agglomerates on a substrate by using modified epoxy resin to obtain a double-end-face grinding disc structure;
(4) and grinding the double-end-face grinding disc structure, and forming chip grooves on the grinding layer to obtain the environment-friendly double-end-face grinding disc for processing the piston ring.
A preparation method of a double-end-face grinding disc structure for piston ring machining comprises the following steps:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a mold, and carrying out hot pressing and sintering to obtain a grinding layer block;
(3) and bonding the grinding layer agglomerates on the substrate by using modified epoxy resin to obtain the double-end-face grinding disc structure.
A preparation method of a grinding layer block for processing a piston ring comprises the following steps:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) and adding the molding material into a mold, and carrying out hot pressing and sintering to obtain the grinding layer agglomerate.
A method of piston ring machining comprising the steps of:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a mold, and carrying out hot pressing and sintering to obtain a grinding layer block;
(3) bonding the grinding layer agglomerates on a substrate by using modified epoxy resin to obtain a double-end-face grinding disc structure;
(4) grinding the double-end-face grinding disc structure, and forming chip grooves on the grinding layer to obtain the environment-friendly double-end-face grinding disc for processing the piston ring;
(5) and (3) respectively installing the piston ring and the environment-friendly double-end-face grinding disc for processing the piston ring on a double-end grinding machine, and starting grinding to finish the processing of the piston ring.
In the technical scheme, the piston ring is made of different hardness and different materials; the grinding time is 1.5-2.5 seconds.
In the invention, the raw materials are respectively as follows by mass percent: 16.7-21.8% of resin powder, 40.6-54% of CBN, 19-25% of corundum (aluminum oxide), 2.2-4% of carbon powder, 4.4-6.5% of copper powder, 1.4-1.8% of calcium oxide powder and 1.2-1.8% of cryolite.
In the invention, the resin powder is phenolic resin powder; the granularity of the CBN is 140# -600 #; the granularity of the corundum is 400# -1000 #; the granularity of the carbon powder is 150# -300 #; the mould is a fan-shaped mould; the corundum provides the effect of supplementary grinding, and the carbon powder increases the sharpness of emery wheel, because work piece process time only has 2S, needs the sharpness of bi-polar mill better, adds the carbon powder and can improve the sharpness of emery wheel, and the cryolite provides the effect of helping with grinding.
The fan-shaped die is characterized in that a die cavity for filling molding materials is of a fan-shaped structure, the obtained grinding layer agglomerates are also of a fan-shaped structure, and the size of the fan shape is not limited; the processing work piece is circular and the width is narrower, still the fracture formula, chooses for use fan-shaped mould can guarantee the plane degree of work piece, can overcome among the current processing engineering that the emery wheel roughness is not good leads to the problem that the work piece warp easily.
In the invention, the hot pressing process comprises the following steps: preheating at 120 deg.C for 5min, heating to 170 deg.C, pressurizing at 20-30MPa, and pressing for 20-40 min; sintering at 180 ℃ for 8-10 hours at 150 ℃.
If the pressure is too low, the agglomeration compactness can be checked; when the pressure is too high, the stress ratio between the powder bodies is large, and the powder bodies can be released after being pressed, so that the caking compactness is poor, or cracks and delamination phenomena are generated. If the binder in the agglomerates cannot completely react in a short pressing time, the surface of the agglomerates is bulged; if the time is too long, the production efficiency is affected (because sintering and curing are carried out later).
The invention discloses an environment-friendly double-end-face grinding disc for processing a piston ring, a double-end-face grinding disc structure for processing the piston ring and a grinding layer caking for processing the piston ring, which are prepared according to the preparation method; the thickness of the grinding layer block is 4-7 mm.
The invention also discloses application of the environment-friendly double-end-face grinding disc for processing the piston ring in processing piston rings with different materials and hardness.
The invention has the beneficial effects that: the formula designed for replacing a common corundum grinding wheel to process the piston ring can meet the processing requirements of piston rings with different hardness and different materials, and has the advantages of high processing efficiency (the service life is more than 6 times of that of the conventional grinding wheel, the time loss and production pause caused by frequent replacement of the grinding wheel are overcome), long service life, and the service life of 1000 ten thousand parts, and can be adjusted by adjusting the thickness of a grinding layer. Particularly, the formula design of the corundum grinding wheel does not generate a large amount of waste residues like the common corundum grinding wheel, so that the pollution to the environment is reduced, and the environment-friendly effect is achieved.
Drawings
FIG. 1 is a schematic view of a sector mold;
FIG. 2 is a diagram of a finished product of an environmentally-friendly resin double-end-face grinding disc;
FIG. 3 is a surface view of a workpiece after being machined by the grinding wheel of the present invention;
FIG. 4 is a surface view of a workpiece after machining with a comparative grinding wheel.
Detailed Description
The present invention will be further described with reference to specific examples.
Example one
The formula and the component ratio of the environment-friendly resin double-end-face grinding disc for replacing a common grinding wheel to process a piston ring are shown in table 1, wherein the granularity of CBN abrasive is 230#, the granularity of corundum (aluminum oxide) is 800#, and the granularity of carbon powder is 200 #.
The specific preparation steps of the environment-friendly double-end-face grinding disc for processing the piston ring are as follows:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a designed fan-shaped die, and molding and pressing; the pressing process comprises the following steps: preheating at 120 ℃ for 5min, heating to 170 ℃, pressurizing at 20MPa and pressing for 30min to obtain a sector grinding block;
(3) preserving the temperature of the sector grinding agglomerates at 160 ℃ for 10h, and hardening;
(4) bonding the hardened fan-shaped grinding layer block on a conventional substrate by using the conventional modified epoxy resin to obtain a double-end-face grinding disc structure;
(5) and grinding the double-end grinding disc structure, and forming chip removal holes in the grinding layer to obtain a finished product.
FIG. 1 is a schematic view of a sector mold with blank portions of the mold cavity filled with molding material; FIG. 2 is a diagram of a finished environment-friendly resin double-end-face grinding disc, and it can be seen that the fan-shaped grinding layer is bonded on a conventional substrate in a lump manner.
The environment-friendly resin double-end-face grinding disc prepared by the method for replacing a common grinding wheel to process the piston ring has the specification that: the external diameter is 585mm, the total thickness is 65mm, the aperture is 50mm, the width of the abrasive layer is 195mm, and the thickness of the abrasive layer is 6 mm.
After a piston ring test for grinding workpieces with different hardness and different materials for multiple times on a V-5C/YHDM-580 double-ended grinding machine, the grinding wheel meets the use requirement of replacing a common grinding wheel. The results show that: the machining center is 73 soft GOE13 piston rings, the allowance is 0.015mm, the time is 2s, and the workpiece opening with the surface roughness RZ2.5 has no deformation; the machining shaft is 82 hard piston rings made of A52(KV1), the allowance is 0.02mm, the time is 2S, the surface roughness RZ is 2.0, and the opening of a workpiece is not deformed. Referring to fig. 3, the workpiece is not burnt and deformed when the whole workpiece is used, and the surface quality and the processing beat of the workpiece completely meet the requirements; and the service life of the abrasive layer with the thickness of 6mm of the grinding wheel is as long as 3 months, which is far longer than that of the existing common grinding wheel (with the thickness of 75 mm) (15 days).
For the grinding wheel with the same outer diameter, the thickness of an abrasive layer of the existing grinding wheel is 75mm, the service life is only 15 days, namely 5mm of the abrasive layer becomes waste slag every day; the environment-friendly resin double-end-face millstone has the abrasive layer of only 6mm, but can be used for 3 months, namely only 0.06mm of the abrasive layer becomes waste slag every day.
In the grinding wheel preparation of the first embodiment, no carbon powder is added, and the rest are the same, the service life of the obtained comparison grinding wheel is 39 days, the processing effect is seen, whether the workpiece is deformed or not is mainly seen, and fig. 3 is a better photo after the processing of the invention, the workpiece is more regular and basically has no deformation; FIG. 4 is a photograph comparing the poor machining of the grinding wheel, mainly the poor sharpness of the grinding wheel, which squeezes the workpiece during machining, causing deformation of the workpiece; the cryolite is not added, the service life of the obtained comparative grinding wheel is 42 days, and the workpiece processing effect is poorer than that of the embodiment; copper powder is not added, the service life of the obtained comparative grinding wheel is 45 days, the machining effect of a workpiece is poorer than that of the embodiment, and the burn phenomenon exists; if the conventional non-fan-shaped grinding block is adopted, the service life of the obtained comparison grinding wheel is 75 days, but the flatness of a workpiece is poor, and the yield is reduced by about 12%.
Example two
The formula and the component ratio of the environment-friendly resin double-end-face grinding disc for replacing a common grinding wheel to process a piston ring are shown in table 2, wherein the CBN abrasive particle size is 170#, the corundum particle size is 800#, and the carbon powder particle size is 220 #.
The specific preparation steps of the environment-friendly double-end-face grinding disc for processing the piston ring are as follows:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a designed fan-shaped mold (as in the first embodiment), and molding and pressing; the pressing process comprises the following steps: preheating at 120 ℃ for 10min, then heating to 170 ℃ and pressurizing at 25MPa for pressing for 40min to obtain a sector grinding block;
(3) preserving the temperature of the sector grinding agglomerates at 160 ℃ for 10h, and hardening;
(4) bonding the hardened fan-shaped grinding layer block on a conventional substrate by using the conventional modified epoxy resin to obtain a double-end-face grinding disc structure;
(5) and grinding the double-end grinding disc structure, and forming chip removal holes in the grinding layer to obtain a finished product.
The environment-friendly resin double-end-face grinding disc prepared by the method for replacing a common grinding wheel to process the piston ring has the specification that: 750mm of outer diameter, 80mm of total thickness, 50mm of aperture, 277.5mm of abrasive layer width, 5mm of abrasive layer thickness.
After a plurality of piston ring tests for grinding workpieces with different hardness and different materials on a V-5C/YHDM-750 double-ended grinding machine, the grinding wheel meets the use requirement of replacing a common grinding wheel. The results show that: the machining shaft is used for machining 78.6 soft piston rings, the allowance is 0.02mm, the time is 2s, and the workpiece opening with the surface roughness RZ2.8 has no deformation; the machining shaft is used for machining a piston ring made of 82 hard materials A52(KV1), the allowance is 0.03mm, the time is 2S, the surface roughness RZ is 2.5, the flatness of a workpiece is 5 mu m, and the workpiece opening is free of deformation. The workpiece is not burnt and deformed after being integrally used, and the surface quality and the processing beat of the workpiece completely meet the requirements; and the service life of the abrasive layer with the diameter of 5mm of the grinding wheel is as long as 1100 thousands (3.5 months), which is far higher than the service life of 150 thousands (15 days) of the common grinding wheel.
Claims (7)
1. A preparation method of an environment-friendly double-end-face grinding disc for piston ring processing comprises the following steps:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a mold, and carrying out hot pressing and sintering to obtain a grinding layer block;
(3) bonding the grinding layer agglomerates on a substrate by using modified epoxy resin to obtain a double-end-face grinding disc structure;
(4) and grinding the double-end-face grinding disc structure, and forming chip grooves on the grinding layer to obtain the environment-friendly double-end-face grinding disc for processing the piston ring.
2. A preparation method of a double-end-face grinding disc structure for piston ring machining comprises the following steps:
(1) uniformly mixing resin powder, corundum, carbon powder, copper powder, calcium oxide powder and cryolite, adding a CBN grinding material, and uniformly mixing to obtain a molding material;
(2) adding the molding material into a mold, and carrying out hot pressing and sintering to obtain a grinding layer block;
(3) and bonding the grinding layer agglomerates on the substrate by using modified epoxy resin to obtain the double-end-face grinding disc structure.
3. The preparation method according to claim 1 or 2, characterized in that the mass percentages of the raw materials are respectively as follows: 16.7-21.8% of resin powder, 40.6-54% of CBN, 19-25% of corundum, 2.2-4% of carbon powder, 4.4-6.5% of copper powder, 1.4-1.8% of calcium oxide powder and 1.2-1.8% of cryolite; the resin powder is phenolic resin powder.
4. The preparation method according to claim 1 or 2, wherein the granularity of CBN is 140# -600 #; the granularity of the corundum is 400-1000 #; the granularity of the carbon powder is 150# -300 #.
5. The method according to claim 1 or 2, wherein the hot pressing process comprises: preheating at 120 ℃ for 5min, then heating to 170 ℃, pressurizing at 20-30MPa, and pressing for 20-40 min; the sintering is carried out at 180 ℃ for 8-10 hours in the sintering process of 150-.
6. The method of claim 1 or 2, wherein the thickness of the grinding layer cake is 4 to 7 mm.
7. The production method according to claim 1 or 2, wherein the mold is a sector mold.
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| CN202010682540.8A CN111906702A (en) | 2018-11-16 | 2018-11-16 | Preparation method of environment-friendly double-end-face grinding disc for processing piston ring |
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| CN202010682540.8A CN111906702A (en) | 2018-11-16 | 2018-11-16 | Preparation method of environment-friendly double-end-face grinding disc for processing piston ring |
| CN201811368733.5A CN109483414B (en) | 2018-11-16 | 2018-11-16 | Environment-friendly double-end-face grinding disc for machining piston ring and preparation method and application thereof |
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| CN109483414B (en) * | 2018-11-16 | 2020-08-18 | 江苏赛扬精工科技有限责任公司 | Environment-friendly double-end-face grinding disc for machining piston ring and preparation method and application thereof |
| CN110116377B (en) * | 2019-05-13 | 2020-04-03 | 郑州磨料磨具磨削研究所有限公司 | Resin binder CBN grinding wheel for steel rail grinding and preparation method thereof |
| CN110328581A (en) * | 2019-06-26 | 2019-10-15 | 郑州磨料磨具磨削研究所有限公司 | Compressor blade side fine grinding resin cubic boron nitride mill and preparation method thereof |
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| CN109483414B (en) | 2020-08-18 |
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