CN111941294A - Grinding wheel for steel rail curved surface grinding vehicle and preparation method thereof - Google Patents
Grinding wheel for steel rail curved surface grinding vehicle and preparation method thereof Download PDFInfo
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- CN111941294A CN111941294A CN202010700793.3A CN202010700793A CN111941294A CN 111941294 A CN111941294 A CN 111941294A CN 202010700793 A CN202010700793 A CN 202010700793A CN 111941294 A CN111941294 A CN 111941294A
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- 238000000227 grinding Methods 0.000 title claims abstract description 128
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims description 36
- 239000004744 fabric Substances 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 29
- 239000000843 powder Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 26
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 18
- 239000011347 resin Substances 0.000 claims description 18
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 15
- 239000005011 phenolic resin Substances 0.000 claims description 15
- 229920001568 phenolic resin Polymers 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 238000007873 sieving Methods 0.000 claims description 11
- 238000009736 wetting Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 7
- 229910001610 cryolite Inorganic materials 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 239000010443 kyanite Substances 0.000 claims description 7
- 229910052850 kyanite Inorganic materials 0.000 claims description 7
- 239000011028 pyrite Substances 0.000 claims description 7
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 7
- 229910052683 pyrite Inorganic materials 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000007822 coupling agent Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000011265 semifinished product Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000010433 feldspar Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 229910001651 emery Inorganic materials 0.000 claims 1
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 239000006061 abrasive grain Substances 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/02—Wheels in one piece
- B24D5/04—Wheels in one piece with reinforcing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/16—Bushings; Mountings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a grinding wheel for a steel rail curved surface grinding vehicle and a preparation method thereof. Compared with the prior art, the invention has the following positive effects: the strength of the grinding wheel meets the heavy load grinding working condition at the linear speed of 50m/s, and the phenomena of cracks and breakage are avoided; in the service life of the grinding wheel, the grinding body is firmly fixed with the aluminum ring without loosening and falling off; the grinding wheel has long service life and has no obvious difference with imported products.
Description
Technical Field
The invention relates to a grinding wheel for a steel rail curved surface grinding vehicle and a preparation method thereof.
Background
With the increasing mileage of high-speed railways and heavy haul railways in China, the occurrence of diseases on the steel rails is more frequent, and particularly the rolling contact fatigue damage of the steel rails is increased. The rail damage not only reduces the riding experience of passengers, but also seriously affects the stability and safety of driving. The rail grinding is a means for prolonging the service life and the service performance of the rail, and the practicability and the effectiveness of the rail grinding are proved through theoretical research and a large number of practices. In technical terms, rail grinding mainly eliminates the negative influence of factors such as waveform abrasion and contact fatigue of the rail on the service life of the rail.
A novel three-dimensional curved surface polishing technology with subversion has been developed abroad, and compared with the traditional two-dimensional plane polishing (cup type) technology, the novel three-dimensional curved surface polishing technology has revolutionary technological leading advantages in the fields of rail corrugation processing, turnout polishing, small-radius curve polishing and the like.
All grinding wheels matched with the curved surface grinding vehicle are imported products, and no substitute product exists in China. Taking MS-12S type curved surface grinding vehicle of Mecno Service company in Italy as an example, the grinding wheel used by the grinding vehicle has 350mm of outer diameter, 127mm of inner diameter and various types of thickness from 25 to 60, the maximum using linear speed reaches 50m/S, the maximum using rotating speed is 2728r/min, and the strength of the common resin grinding wheel cannot meet the using requirement.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a grinding wheel for a steel rail curved surface grinding vehicle and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the grinding wheel for the steel rail curved surface grinding vehicle comprises a grinding body, glass fiber mesh cloth and an aluminum ring, wherein the glass fiber mesh cloth is arranged in the grinding body in a layered mode, and the aluminum ring is embedded on the inner circumference of the grinding body.
The invention also provides a preparation method of the grinding wheel for the steel rail curved surface grinding wagon, which comprises the following steps:
step one, mixing fillers:
adding the potassium feldspar powder, the pyrite, the cryolite, the gypsum powder and the kyanite into a V-shaped mixer in a descending order according to mass fraction, uniformly mixing, and then sieving by a 100-mesh sieve for later use;
step two, resin mixing:
uniformly mixing phenolic resin powder and new phenolic resin powder according to the mass ratio of (3-3.5) to 1, and then sieving the mixture through a 100-mesh sieve for later use;
step three, abrasive wetting:
mixing SG grinding materials and furfuryl alcohol in a counter-current mixer for 3-8 minutes to fully wet the surfaces of the grinding materials;
step four, adding the wetting material in the step three to the mixed filler in the step one, mixing for 1-3 minutes, adding the mixed resin in the step two, mixing for 1-3 minutes, sieving by using an 8-mesh sieve, removing the agglomerated material by using a sieve, and forming;
step five, forming:
after the die is assembled, an aluminum ring is arranged on a die core, the mixture obtained in the fourth step is evenly divided into 5 times of feeding and die filling according to the total weight, the mixture is stirred evenly and scraped evenly after each time of feeding, then a piece of glass fiber grid cloth is put in, and finally a piece of material is fed again after the fourth piece of grid cloth is put in, and the mixture is stirred evenly and scraped evenly and then is subjected to cold press molding;
step six, hardening:
and (4) putting the semi-finished product obtained in the fifth step into a hardening furnace, heating to 180-200 ℃, and hardening for 30-40 hours.
Compared with the prior art, the invention has the following positive effects: the strength of the grinding wheel meets the heavy load grinding working condition at the linear speed of 50m/s, and the phenomena of cracks and breakage are avoided; in the service life of the grinding wheel, the grinding body is firmly fixed with the aluminum ring without loosening and falling off; the grinding wheel has long service life and has no obvious difference with imported products. The concrete expression is as follows:
(1) the strength of the grinding wheel is greatly improved by adopting a multi-layer glass fiber mesh cloth and an aluminum ring reinforced structure and performing type selection and impregnation treatment on the glass fiber mesh cloth;
(2) the aluminum ring is designed by adopting a structure of reinforcing ribs and anti-rotating strips, and is subjected to sand blasting and gluing treatment, so that the aluminum ring is tightly combined with the grinding body, does not loosen and fall off in the grinding process, and is reinforced by the grinding wheel;
(3) SG grinding materials are adopted to improve the grinding ratio and prolong the service life of the grinding wheel;
(4) the formula design controls the porosity of the grinding wheel, and the grinding wheel is not blocked and has no burn phenomenon in the curved surface polishing process.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a diagram of a curved surface grinding wheel;
FIG. 2 is a diagram of the effect of the grinding body;
FIG. 3 is a schematic view of the composition of the grinding body;
FIG. 4 is a schematic view of a fiberglass mesh;
FIG. 5 is a view showing the structure of an aluminum ring;
the reference numbers in the figures illustrate: 1. grinding the body; 2. glass fiber mesh cloth; 3. an aluminum ring; 11. an abrasive; 12. air holes; 13 a binding agent; 31. reinforcing ribs; 32. the anti-rotation strip.
Detailed Description
The invention provides a grinding wheel for a steel rail curved surface grinding vehicle and a preparation method thereof. The whole structure of the grinding wheel consists of a grinding body 1, glass fiber mesh cloth 2 and an aluminum ring 3, as shown in figure 1. Wherein: the grinding body 1 is composed of an abrasive 11, air holes 12 and a bonding agent 13, as shown in fig. 2 and fig. 3, the bonding agent 13 combines abrasive grains together to provide support for cutting of the abrasive grains, and the air holes 12 play a role in accommodating chips and dissipating heat. The grinding body comprises the following components in parts by weight: 65-70 parts of SG abrasive, 6-12 parts of phenolic resin powder, 2-4 parts of neophenol resin powder, 1-3 parts of feldspar powder, 4-8 parts of pyrite, 2-6 parts of cryolite, 3-5 parts of gypsum powder, 1-3 parts of kyanite and 1-3 parts of furfuryl alcohol.
Preferably 70 parts of SG abrasive, 9 parts of phenolic resin powder, 3 parts of neophenol resin powder, 2.7 parts of potassium feldspar powder, 6 parts of pyrite, 2.5 parts of cryolite, 3.3 parts of gypsum powder, 1.5 parts of kyanite and 2 parts of furfuryl alcohol.
The SG abrasive is preferably selected as the abrasive, is formed by sintering a special seeding gel system, is a revolutionary new-generation alumina abrasive, has the advantages of high hardness, good toughness, strong sharpness and the like, and has the advantages of high grinding ratio, strong retentivity, good workpiece surface processing quality, difficult blockage of a grinding wheel, high grinding efficiency and the like compared with the common corundum abrasive.
The resin is mixed resin, is composed of phenolic resin and new phenolic resin in a ratio of (3-3.5): 1, and can form stronger holding force on SG abrasive materials, so that abrasive particles are fully used and are not easy to fall off. The volume ratio of the air holes can be ensured to effectively contain and dissipate heat through the formula design, so that new grinding materials are exposed to participate in grinding.
The glass fiber mesh cloth 2 (shown in figure 4) can improve the strength of the grinding wheel, reduce the fatigue of the grinding wheel, retain broken fragments of the grinding wheel and improve the lateral rigidity of the grinding wheel. The glass fiber is selected from alkali-free glass fiber (with alkali content of 0-2%), alkali-free glass fiber which has high mechanical strength relative to high-alkali glass fiber (with alkali content of 14-17%) and medium-alkali glass fiber (with alkali content of 8-12%), water resistance, moisture resistance and good electrical insulation.
The glass fiber twist is preferably twisted glass yarn, compared with untwisted glass yarn, after the surface treatment of the resin liquid, the resin liquid can be remained on the surface as much as possible and is not immersed in the middle of the yarn, so that the glass fiber is better in flexibility, can be better fused with a forming material, and avoids the layering phenomenon.
The number of the glass strands is preferably 40, the number of the flat grinding wheel is 20-40, and the strength of the grinding wheel can be enhanced by thickening the strands under the condition that the grinding wheel is added with mesh cloth and is not layered.
The size of the grid distribution grid of the flat grinding wheel is selected from the range of 3# -5 #, and the 4# grid is preferably selected according to the grain size distribution of SG abrasive grain size F16.
The glass fiber mesh cloth can be better combined with a molding material after surface treatment, preferably, epoxy resin liquid and south Dao-42 coupling agent are mixed into surface treatment liquid, and the adding amount of the south Dao-42 coupling agent accounts for 0.3-0.8 percent, preferably 0.5 percent of the mass ratio of the epoxy resin liquid. And soaking the glass fiber mesh cloth in the surface treatment liquid, and drying in an oven.
The outer surface of the aluminum ring 3 (shown in figure 5) is treated by a sand blasting process, so that the surface roughness is increased, and the bonding degree of a grinding wheel bonding agent and the outer surface of the aluminum ring 3 is increased; the outer surface of the aluminum ring 3 is coated with phenolic resin liquid and silane coupling agent, and is dried, so that the adhesive force between the grinding body 1 and the aluminum ring 3 can be further enhanced after the aluminum ring is heated and hardened.
The outer circumference of the aluminum ring 3 in contact with the grinding body 1 is provided with a structure of a reinforcing rib 31 and an anti-rotation strip 32, the grinding body 1 is formed by pressing a mixture through a hydraulic machine to wrap the aluminum ring 3, and after a hardening process, the grinding body 1 and the aluminum ring 3 form a stable mosaic structure.
The invention provides a grinding wheel structure for a steel rail curved surface grinding vehicle and a preparation method thereof, wherein the size specification is 350 multiplied by 40 multiplied by 127, and the molding density is 2.62g/cm3The maximum using linear velocity reaches 50m/s, the maximum using rotating speed is 2728r/min, the polishing pressure is 1500-3000N, the structure consists of a polishing body, glass fiber gridding cloth and an aluminum ring, and the preparation method comprises the following steps:
And (3) mixing of fillers: adding the potassium feldspar powder, the pyrite, the cryolite, the gypsum powder and the kyanite into a V-shaped mixer from large to small according to the mass fraction, wherein the volume of the mixture is not more than 40% of the volume of the mixer, the rotating speed is set to be 20 revolutions per minute, the mixing time is 30-60 minutes, preferably 50 minutes, and the mixture is used after passing through a 100-mesh screen;
Resin mixing: mixing phenolic resin powder and new phenolic resin powder according to the mass ratio of (3-3.5) to 1, preferably 3:1, for 20-30 minutes, preferably 20 minutes, and sieving with a 100-mesh sieve for later use;
Wetting the abrasive: mixing SG grinding materials and furfuryl alcohol in a counter-current mixer for 3-8 minutes, preferably 4 minutes, and fully wetting the surfaces of the grinding materials;
step 4
Adding the wetting material in the step 3 into the mixed filler in the step 1, mixing the two mixed materials for 1-3 minutes, preferably 2 minutes, adding the mixed resin in the step 2 for 1-3 minutes, preferably 1 minute, sieving the mixed resin with an 8-mesh sieve, and sieving to remove the agglomerated material for forming;
step 5
Molding: assembling a mould, mounting an aluminum ring on a mould core, evenly dividing the mixture obtained in the step 4 into 5 times of feeding and mould filling according to the total weight, uniformly stirring and striking, putting a piece of glass fiber mesh cloth, putting 4 pieces of glass fiber mesh cloth in total, cold-press molding, keeping the pressure of the grinding wheel in unit area at 10-25 MPa, preferably 25MPa, and finally keeping the pressure for 15-20 minutes, preferably 20 minutes;
the 5 charges and 4 pieces of mesh cloth were specifically set as follows: firstly feeding a first material, uniformly stirring and leveling, then placing a piece of grid cloth, then feeding a second material, uniformly stirring and leveling, then placing a piece of grid cloth, adding a second material till four pieces of grid cloth are placed, uniformly stirring and leveling, and then carrying out cold press molding.
Step 6
Hardening: and (4) putting the semi-finished product obtained in the step (5) into a hardening furnace, finally heating to 180-200 ℃, preferably 190 ℃, and hardening for 30-40 hours, preferably 40 hours.
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
The experimental procedures of the following examples are conventional unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
The preparation method comprises the following steps:
example 1
The grinding wheel structure for the steel rail curved surface grinding vehicle comprises a grinding body, glass fiber gridding cloth and an aluminum ring, and the preparation method of the grinding wheel comprises the following steps:
1) and (3) mixing of fillers: 2.7 parts of potassium feldspar powder, 6 parts of pyrite, 2.5 parts of cryolite, 3.3 parts of gypsum powder and 1.5 parts of kyanite are added into a V-shaped mixer from large to small according to the mass fraction, the volume of the mixture is not more than 40% of the volume of the mixer, the rotating speed is set to be 20 r/min, the mixing time is 50 min, and the mixture is screened by a 100-mesh screen for later use;
2) resin mixing: mixing 9 parts of phenolic resin powder and 3 parts of new phenolic resin powder for 20 minutes, and sieving the mixture by a 100-mesh sieve for later use;
3) wetting the abrasive: mixing 70 parts of SG grinding material and furfuryl alcohol 2 in a counter-current mixer for 4 minutes, and fully wetting the surface of the grinding material;
4) adding the wetting material in the step 3 into the mixed filler in the step 1, mixing for 2 minutes, adding the mixed resin in the step 2 for 1 minute, sieving by using an 8-mesh sieve, removing the agglomerated material by using a sieve, and forming;
5) molding: assembling the die, mounting an aluminum ring on a die core, evenly dividing the mixture obtained in the step 4 into 5 times of feeding and die filling according to the total weight, uniformly stirring and striking, putting a piece of glass fiber mesh cloth, putting 4 pieces of glass fiber mesh cloth in total, performing cold press molding, keeping the pressure of the grinding wheel per unit area at 25MPa, and finally keeping the pressure for 20 minutes;
6) hardening: and (5) placing the semi-finished product obtained in the step (5) into a hardening furnace, and finally heating to 190 ℃ for hardening for 40 hours.
Example 2
The structure and the preparation method of the curved surface grinding wheel in the embodiment are the same as those in the embodiment 1, except that SG abrasive is used in the embodiment 1, and zirconia corundum abrasive is used in the embodiment. The specific difference is the following step 3):
3) wetting the abrasive: 70 parts of corundum-zirconia abrasive and 2 parts of furfuryl alcohol are mixed in a counter-current mixer for 4 minutes, and the surface of the abrasive is fully wetted.
Example 3
The preparation method of the curved surface grinding wheel in the embodiment is the same as that in the embodiment 1, except that the composition structure of the grinding wheel is different, and 4 layers of glass fiber mesh cloth are used in the embodiment 1 and are not added in the embodiment. The specific difference is the following step 5):
5) molding: assembling the die, mounting an aluminum ring on a die core, evenly dividing the mixture obtained in the step 4 into 2 times of feeding and die filling according to the total weight, stirring uniformly and strickling after feeding, performing cold press molding, keeping the pressure of the grinding wheel at 25MPa per unit area, and finally maintaining the pressure for 20 minutes.
Example 4
The preparation method of the curved surface grinding wheel in the embodiment is the same as that in the embodiment 1, the difference is that the grinding wheel has a different composition structure, and an aluminum ring is used in the embodiment 1 and is not added in the embodiment. The specific difference is the following step 5):
5) molding: assembling the die, evenly dividing the mixture obtained in the step 4 into 5 times of feeding and die filling according to the total weight, uniformly stirring and leveling after feeding, putting a piece of glass fiber mesh cloth, putting 4 pieces of glass fiber mesh cloth in total, carrying out cold press molding, keeping the pressure of the grinding wheel per unit area at 25MPa, and finally keeping the pressure for 20 minutes.
The performance of the grinding wheel for the curved surface grinding wagon prepared in the above example was tested to obtain a performance test table for the grinding wheel for the curved surface grinding wagon in the above example, as shown in table one.
Table one embodiment grinding wheel performance detecting table for curved surface grinding vehicle
By comparison of the above examples 1 and 2, it can be seen that the consumption of SG abrasive is smaller than that of zirconia alumina at the same workpiece grinding amount, i.e., the service life is longer.
From the comparison between the above example 1 and examples 3 and 4, it can be seen that the maximum use rotation speed of the curved surface grinding wheel structure of the present invention is the highest, and the limit use rotation speed is greatly reduced without using a glass fiber mesh cloth or an aluminum ring.
Claims (10)
1. The utility model provides a rail curved surface is emery wheel for grinding wagon which characterized in that: the grinding body is internally provided with glass fiber gridding cloth in a layered mode, and the aluminum ring is embedded on the inner circumference of the grinding body.
2. The grinding wheel for a rail curved surface grinding wagon according to claim 1, wherein: the number of glass yarn strands of the glass fiber mesh cloth is 20-40.
3. The grinding wheel for a rail curved surface grinding wagon according to claim 1, wherein: the meshes of the glass fiber mesh cloth are 3# -5 # meshes.
4. The grinding wheel for a rail curved surface grinding wagon according to claim 1, wherein: and reinforcing ribs and anti-rotation strips are arranged on the outer circumference of the aluminum ring in contact with the grinding body.
5. The grinding wheel for a rail curved surface grinding wagon according to claim 1, wherein: and coating phenolic resin liquid and a silane coupling agent on the outer surface of the aluminum ring.
6. The grinding wheel for a rail curved surface grinding wagon according to claim 1, wherein: the grinding body comprises the following components in parts by weight: 65-70 parts of SG abrasive, 6-12 parts of phenolic resin powder, 2-4 parts of neophenol resin powder, 1-3 parts of feldspar powder, 4-8 parts of pyrite, 2-6 parts of cryolite, 3-5 parts of gypsum powder, 1-3 parts of kyanite and 1-3 parts of furfuryl alcohol.
7. A preparation method of a grinding wheel for a steel rail curved surface grinding vehicle is characterized by comprising the following steps: the method comprises the following steps:
step one, mixing fillers:
adding the potassium feldspar powder, the pyrite, the cryolite, the gypsum powder and the kyanite into a V-shaped mixer in a descending order according to mass fraction, uniformly mixing, and then sieving by a 100-mesh sieve for later use;
step two, resin mixing:
uniformly mixing phenolic resin powder and new phenolic resin powder according to the mass ratio of (3-3.5) to 1, and then sieving the mixture through a 100-mesh sieve for later use;
step three, abrasive wetting:
mixing SG grinding materials and furfuryl alcohol in a counter-current mixer for 3-8 minutes to fully wet the surfaces of the grinding materials;
step four, adding the wetting material in the step three to the mixed filler in the step one, mixing for 1-3 minutes, adding the mixed resin in the step two, mixing for 1-3 minutes, sieving by using an 8-mesh sieve, removing the agglomerated material by using a sieve, and forming;
step five, forming:
after the die is assembled, an aluminum ring is arranged on a die core, the mixture obtained in the fourth step is evenly divided into 5 times of feeding and die filling according to the total weight, the mixture is stirred evenly and scraped evenly after each time of feeding, then a piece of glass fiber grid cloth is put in, and finally a piece of material is fed again after the fourth piece of grid cloth is put in, and the mixture is stirred evenly and scraped evenly and then is subjected to cold press molding;
step six, hardening:
and (4) putting the semi-finished product obtained in the fifth step into a hardening furnace, heating to 180-200 ℃, and hardening for 30-40 hours.
8. The method for preparing the grinding wheel for the steel rail curved surface grinding wagon according to claim 7, wherein the method comprises the following steps: when the fillers are mixed, the volume of the mixture is not more than 40% of the volume of the V-shaped mixer, the rotating speed of the V-shaped mixer is 20 revolutions per minute, and the mixing time is 30-60 minutes; and step two, the mixing time of the resin is 20-30 minutes.
9. The method for preparing the grinding wheel for the steel rail curved surface grinding wagon according to claim 7, wherein the method comprises the following steps: and fifthly, during cold press molding, the pressure of the grinding wheel in unit area is 10-25 MPa, and finally the pressure is maintained for 15-20 minutes.
10. The method for preparing the grinding wheel for the steel rail curved surface grinding wagon according to claim 7, wherein the method comprises the following steps: the glass fiber of the glass fiber gridding cloth is alkali-free glass fiber; the glass fiber twist is twisted glass yarn; soaking the glass fiber mesh cloth in the surface treatment liquid for soaking, and then drying in an oven; the surface treatment liquid is prepared by mixing epoxy resin liquid and south Dao-42 coupling agent, wherein the addition amount of the south Dao-42 coupling agent accounts for 0.3-0.8% of the mass ratio of the epoxy resin liquid.
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Cited By (1)
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| CN113799007A (en) * | 2021-09-13 | 2021-12-17 | 辽宁黄海砂轮制造有限公司 | Method for manufacturing special alloy steel billet grinding wheel |
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