CN112223130B - Non-magnetic grinding wheel for grinding ball base surface of bearing roller and production process thereof - Google Patents
Non-magnetic grinding wheel for grinding ball base surface of bearing roller and production process thereof Download PDFInfo
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- CN112223130B CN112223130B CN202011113000.4A CN202011113000A CN112223130B CN 112223130 B CN112223130 B CN 112223130B CN 202011113000 A CN202011113000 A CN 202011113000A CN 112223130 B CN112223130 B CN 112223130B
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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
- B24D18/0054—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by impressing abrasive powder in a matrix
Abstract
The application relates to the technical field of grinding tools, and particularly discloses a bearing roller ball base surface grinding non-magnetic grinding wheel and a production process thereof. The application discloses a bearing roller ball base surface grinding does not have magnetic grinding emery wheel includes the bottom and sets up the grinding layer on the bottom, the bottom is mainly made by the bottom raw materials of following parts by weight: 8-12 parts of chromium sand, 1.5-2.0 parts of phenolic resin A and 0.5-0.8 part of gypsum powder, wherein the grinding layer is mainly prepared from the following grinding layer raw materials in parts by weight: 8-10 parts of white corundum, 0.8-1.5 parts of green silicon carbide, 0.3-0.6 part of epoxy resin, 0.2-0.3 part of dibutyl ester and 0.95-1.2 parts of phenolic resin B. The grinding non-magnetic grinding wheel for the ball base surface of the bearing roller has high stability and good grinding effect in the using process.
Description
Technical Field
The application relates to the technical field of grinding tools, in particular to a non-magnetic grinding wheel for grinding a ball base surface of a bearing roller and a production process thereof.
Background
The bearing is an important part in mechanical equipment, and can support the mechanical rotating body and reduce friction in the movement process of the mechanical rotating body. The performance of the bearing can influence the performance of the equipment, and the machining precision of the bearing is an important factor influencing the performance of the bearing.
The rolling bearing can be divided into a ball bearing and a roller bearing, and the roller bearing can be divided into a plurality of types such as a cylindrical roller bearing, a tapered roller bearing, a needle bearing and the like, wherein the tapered roller bearing can bear larger radial load and axial load and has wide application. In the production of tapered roller bearings, the grinding of tapered rollers, particularly the grinding of spherical end faces, is critical. The grinding of the spherical end face of some tapered rollers is carried out by a magnetic disk, and harmful residual magnetism can be brought to the tapered rollers in the feeding process, so that a non-magnetic spherical end face grinding machine is adopted in most of the existing tapered roller processing. The grinding machine is generally a tapered roller spherical end surface grinding machine adopting a solid cylindrical grinding wheel, the axes of a feeding disc and the grinding wheel are in the same plane, the working end surface of the grinding wheel is a concave spherical surface, and the tapered roller is ground and formed after passing through the center of the end surface of the grinding wheel under the driving of the feeding disc.
The patent of chinese utility model with the publication number of CN202540161U discloses a compound grinding wheel for taper roller ball base surface non-magnetic grinding grinder, this grinding wheel includes the grinding wheel body, and the grinding wheel body comprises coarse grinding grain layer and fine grinding grain layer, and coarse grinding grain in situ portion is provided with fine grinding grain layer, and the coarse grinding grain layer is the cylinder, and fine grinding grain layer is cylindrical.
In view of the above-mentioned related art, the inventor believes that the grinding surface of the grinding wheel is divided into two areas, and the workpiece is unevenly stressed in the grinding process, which easily causes the reduction of the grinding quality of the workpiece.
Disclosure of Invention
In order to improve the uniformity of a grinding layer, the application provides a non-magnetic grinding wheel for grinding a ball base surface of a bearing roller and a production process thereof.
First aspect, the application provides a bearing roller ball base face grinding does not have magnetism grinding wheel adopts following technical scheme: the utility model provides a bearing roller ball base face grinding does not have magnetic grinding emery wheel, includes the bottom and sets up the grinding layer on the bottom, the bottom is mainly made by the bottom raw materials of following parts by weight: 8-12 parts of chromium sand, 1.5-2.0 parts of phenolic resin A and 0.5-0.8 part of gypsum powder, wherein the grinding layer is mainly prepared from the following grinding layer raw materials in parts by weight: 8-10 parts of white corundum, 0.8-1.5 parts of green silicon carbide, 0.3-0.6 part of epoxy resin, 0.2-0.3 part of dibutyl ester and 0.95-1.2 parts of phenolic resin B.
Through adopting above-mentioned technical scheme, the emery wheel sets up to bottom and grinding layer, when the emery wheel ground the work piece, only grinding layer acted on the work piece, and the grinding effect is more even. In addition, gypsum is added into the raw materials of the bottom layer of the grinding wheel, so that the strength of the bottom layer can be improved, the bottom layer is not easy to deform in the curing process, good positioning of embedded parts (bolts and the like) in the bottom layer can be realized, the positioning precision of the finally manufactured grinding wheel during mounting is improved, and the grinding wheel is more stable in the operation process.
The grinding layer adopts two kinds of abrasive materials of white corundum and green silicon carbide, and green silicon carbide can play the effect of reinforcement to the intensity that improves the grinding layer. Because the grinding layer thickness of the grinding wheel of this application is great relatively, in the use, the inside heat that leads to of emery wheel is concentrated easily, and green silicon carbide can play good heat conduction effect, derives the inside heat of emery wheel, has reduced the inside temperature of emery wheel, has further improved the stability of emery wheel when using. The addition of green silicon carbide also improves the finish of the wheel surface.
Preferably, the bottom layer is mainly prepared from the following raw materials in parts by weight: 10 parts of chromium sand, 1.7 parts of phenolic resin A and 0.6 part of gypsum powder, wherein the grinding layer is mainly prepared from the following raw materials in parts by weight: 9 parts of white corundum, 1 part of green silicon carbide, 0.4 part of epoxy resin, 0.25 part of dibutyl ester and 1.05 parts of phenolic resin B.
By adopting the technical scheme, the proportion of the raw materials of each layer of the grinding wheel is optimized, and the manufactured grinding wheel has better grinding performance and longer service life.
Preferably, the granularity of the chromium sand in the bottom layer raw material is any one of 36#, 46#, and 50 #.
By adopting the technical scheme, the granularity of the chromium sand in the raw material of the bottom layer is larger, the strength and the impact resistance of the bottom layer are improved, and the grinding wheel is more stable in the using process.
Preferably, the grain size of the white corundum in the grinding layer raw material is any one of 180#, 240#, and 280 #; the granularity of the green silicon carbide in the grinding layer raw material is any one of 2000#, 2500#, and 3000 #.
By adopting the technical scheme, the grain diameter of the abrasive in the grinding layer is smaller than that of the abrasive in the bottom layer, so that the grinding wheel can grind the roller more uniformly and finely, and the improvement of the surface quality of a grinding workpiece is facilitated. Because the hardness of green silicon carbide is bigger, the granularity of green silicon carbide in the setting grinding layer is littleer for the granularity of white corundum, can improve the roughness of work piece surface.
Preferably, the phenolic resin A in the bottom layer raw material is composed of phenolic resin liquid and phenolic resin powder according to the mass ratio of 35-55: 100-120.
By adopting the technical scheme, the phenolic resin in the bottom raw material is obtained by mixing two phenolic resins with different specifications, the phenolic resin liquid can be uniformly mixed with the chromium sand firstly, so that the liquid phenolic resin is wrapped on the surface of the chromium sand, and then the liquid phenolic resin is mixed with the gypsum powder and then mixed with the phenolic resin powder, so that the gypsum powder is adhered to the phenolic resin liquid on the surface of the chromium sand, and the phenolic resin powder is wrapped outside the gypsum powder, thereby improving the adhesive strength and the adhesive uniformity of each raw material.
In a second aspect, the application provides a production process for grinding a ball-base surface of a bearing roller to form a non-magnetic grinding wheel, which adopts the following technical scheme:
a production process for grinding the ball base surface of the bearing roller without magnetic grinding comprises the following steps:
1) adding the uniformly mixed raw material of the bottom layer into a die, flattening, adding the uniformly mixed raw material of the grinding layer, and scraping;
2) pressing and molding by using a pressing head with a spherical convex surface; then heating to 90-100 ℃ within 3-5h, then heating to 130-140 ℃ within 16-22h, then heating to 160-165 ℃ within 3-5h, preserving the heat for 6-8h, and cooling to obtain the composite material.
By adopting the technical scheme, when the grinding wheel is prepared, the raw material of the bottom layer is firstly added, then the raw material of the grinding layer is added, and then the grinding wheel is pressed and formed, so that the binding force between the two layers can be improved. During sintering, a multi-stage heating mechanism is adopted, so that the occurrence of air holes, cracks, layer cracks, collapse and the like caused by that gas cannot be exhausted in time in the heating process is reduced.
Preferably, in the step 1), concave surfaces are scraped on the upper surfaces of the flattened bottom layer raw materials, and then the uniformly mixed grinding layer raw materials are added.
Through adopting above-mentioned technical scheme, add the grinding coat raw materials after the concave surface is scraped to the upper surface of the bottom raw materials after shakeouts, can make the interface between the bottom of finally making and the grinding coat keep the concave surface, make the bottom present the thin thick shape all around in center, set up the built-in fitting in the bottom position that the bottom is thick, and central point is thinner relatively, can make the center protrusion of the grinding coat that corresponds, when the emery wheel uses, still can keep the grinding sphere when the position that is close to the bottom is ground, the effective utilization of grinding coat has been improved.
Preferably, the uniformly mixed raw materials of the bottom layer are prepared by a method comprising the following steps: the chromium sand and the phenolic resin liquid are uniformly mixed, then the mixture is uniformly mixed with the gypsum powder, and then the mixture is uniformly mixed with the phenolic resin powder.
By adopting the technical scheme, the chromium sand is uniformly mixed with the phenolic resin liquid, the surface of chromium sand particles is wrapped by a layer of liquid phenolic resin, the gypsum powder can be adhered to the surface of the phenolic resin liquid when the chromium sand particles are mixed with the gypsum powder to form a very uniform gypsum powder layer, and finally the gypsum powder is mixed with the phenolic resin powder, so that the phenolic resin powder can be uniformly adhered to the outer layer of the gypsum powder, and the chromium sand particles and the gypsum powder are uniformly and firmly adhered together after solidification.
Preferably, the grinding layer raw material uniformly mixed in the step 1) is prepared by a method comprising the following steps: uniformly mixing the epoxy resin liquid and dibutyl ester, adding white corundum, uniformly mixing, adding green silicon carbide, uniformly mixing, adding phenolic resin B, and uniformly mixing, wherein the phenolic resin B is phenolic resin powder.
Through adopting above-mentioned technical scheme, with epoxy liquid and dibutyl misce bene, dibutyl ester can reduce epoxy's viscosity, improves epoxy's mobility, also is convenient for prolong the storage time that epoxy liquid and dibutyl mixed the liquid, is convenient for follow-up and takes. And then the mixture is mixed with chrome sand, so that the surface of the white corundum can be coated with a layer of liquid bonding agent. The surface mirror effect of the green silicon carbide particles is very strong, the infiltration effect is poor, and after the liquid binder is wrapped on the surface of the white corundum particles, the green silicon carbide particles are added, so that the green silicon carbide is more uniformly dispersed in the raw materials, and the bonding strength is higher.
In summary, the present application has the following beneficial effects:
1. the utility model provides a bearing roller ball base face grinding does not have magnetism and grinds emery wheel includes bottom and grinding layer, and chromium sand, phenolic resin and gesso are adopted as the raw materials in the bottom, can make the bottom have higher intensity, have also reduced the deformation when the resin solidifies, are convenient for go fixed emery wheel through the bottom, have improved the stability of emery wheel in the use. The grinding layer is added with the green silicon carbide, the grinding effect is improved in a synergistic mode, and the internal heat of the grinding layer is led out.
2. In the production process of the bearing roller ball base surface grinding non-magnetic grinding wheel, a multi-section temperature rising mode is adopted during sintering, so that gas in raw materials can be fully discharged, the phenomenon of hardening around bubbles is reduced, and the occurrence of air holes, cracks, spalling, collapse and the like caused by the fact that the gas cannot be discharged in time in the temperature rising process is also reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
The grinding wheel is a bearing roller grinding wheel. Furthermore, the grinding wheel is a conical bearing roller ball base surface grinding non-magnetic grinding wheel.
The application discloses no magnetism grinding wheel of bearing roller ball base face grinding, including bottom and the grinding layer of setting on the bottom, the bottom is mainly made by the bottom raw materials of following parts by weight: 8-12 parts of chromium sand, 1.5-2.0 parts of phenolic resin A and 0.5-0.8 part of gypsum powder;
the grinding layer is mainly prepared from the following raw materials in parts by weight: 8-10 parts of white corundum, 0.8-1.5 parts of green silicon carbide, 0.3-0.6 part of epoxy resin, 0.2-0.3 part of dibutyl ester and 0.95-1.2 parts of phenolic resin B.
Furthermore, the granularity of the chromium sand in the raw material of the bottom layer is 46 #. The particle size is 350-440 μm. The grain size of white corundum in the raw material of the grinding layer is 240 #. The particle size is 53-63 μm. The granularity of green silicon carbide in the raw material of the grinding layer is 2500 #. The grain diameter is 5-6 μm.
The chromium sand is chromium slag (chromium ore sand).
Furthermore, the phenolic resin A in the bottom layer raw material is composed of phenolic resin liquid and phenolic resin powder according to the mass ratio of 50:105 or 50: 120. Further, the phenolic resin liquid is phenolic resin liquid 2124, and the phenolic resin powder is phenolic resin powder 2123. Further, the solid content of the phenolic resin liquid 2124 was 56.2%.
Further, the epoxy resin in the raw material of the grinding layer is an epoxy resin solution, and further, the phenolic resin solution is a phenolic resin solution 860. The phenolic resin B in the raw material of the grinding layer is phenolic resin powder, and further the phenolic resin powder is phenolic resin powder 2123.
The molding density of the base layer was 2.06g/cm 3 . The forming density of the grinding layer is 1.8-2.04g/cm 3 。
The gypsum powder is semi-hydrated gypsum powder.
Furthermore, the grinding layer raw material also comprises 1-1.5 parts by weight of ground powder. The grinding powder is grinding debris generated when the bearing roller ball base surface grinding non-magnetic grinding wheel of the application is used for processing the roller.
The grinding layer raw material also comprises 0.5-0.8 part by weight of an elasticity reinforcing agent, and the elasticity reinforcing agent consists of silica sol and acetylene black in a weight ratio of 10-12: 5-7.
The raw material of the grinding layer also comprises 0.2-0.5 weight part of ethylene-maleic anhydride-vinyl acetate copolymer. The raw material of the grinding layer also comprises 0.05-0.06 weight part of cerium oxide.
The production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps: 1) adding the uniformly mixed raw material of the bottom layer into a die, flattening, adding the uniformly mixed raw material of the grinding layer, and scraping; 2) pressing and molding by using a pressing head with a spherical convex surface; then heating to 90-100 ℃ within 3-5h, then heating to 130-140 ℃ within 16-22h, then heating to 160-165 ℃ within 3-5h, preserving the heat for 6-8h, and cooling to obtain the product. Preferably, the temperature is raised to 140 ℃ within 16-22h, namely the temperature is raised to 120 ℃ within 13-16h, and then the temperature is raised to 140 ℃ within 3-6 h.
Preferably, in the step 1), concave surfaces are scraped on the upper surface of the flattened bottom layer raw material, and then the uniformly mixed grinding layer raw material is added. The scraped concave surface is a conical surface or a spherical concave surface. Further, after the concave surface is scraped out, 5-8N/mm is adopted 2 Compacting under pressure, and then shaving the compacted surface. The shaving is that the compacted concave surface is scraped by a scraping plate with thorns on the surface.
When the uniformly mixed bottom layer raw material is prepared, the chromium sand and the phenolic resin liquid are uniformly mixed and stirred for 10-15min at the rotating speed of 45-55 rpm. Adding Gypsum powder, mixing well, stirring at 60-70rpm for 3-5 min. Adding phenolic resin powder, stirring uniformly at the rotating speed of 30-40rpm for 3-7 min. Adding phenolic resin powder, mixing uniformly, and sieving.
Further, the chromium sand and the milled powder are uniformly mixed and then uniformly mixed with the phenolic resin liquid.
When the uniformly mixed grinding layer raw material is prepared, the epoxy resin liquid and the dibutyl ester are uniformly mixed at 80 ℃. After epoxy resin liquid and dibutyl ester are mixed evenly, white corundum is added and mixed evenly, and the mixture is stirred for 1 to 1.5 hours at the rotating speed of 55 to 65 rpm. Then adding green silicon carbide, uniformly mixing, and stirring at the rotating speed of 40-50rpm for 1-1.5 h. Then adding phenolic resin powder, uniformly mixing, and stirring at the rotating speed of 30-40rpm for 25-35 min. Adding phenolic resin powder, mixing uniformly, and sieving.
In the step 1), an embedded part is fixed in a mould before the bottom layer raw material is added. The embedded parts are bolts.
The pressure of the compression molding in the step 2) is 20-30N/mm 2 。
The cooling is to room temperature.
Example 1
The bearing roller ball base surface grinding non-magnetic grinding wheel comprises a bottom layer and a grinding layer arranged on the bottom layer, the whole bottom layer is of a cylindrical structure, one end face of the bottom layer is a plane, and the other end face of the bottom layer is a conical concave surface. The whole appearance of the grinding layer is of a cylindrical structure, one end face of the grinding layer combined with the bottom layer is a conical convex face, and the other end face of the grinding layer is a spherical concave face. The diameter of the grinding layer is equal to that of the bottom layer, and the end face of the conical convex surface of the grinding layer is fixedly connected with the end face of the conical concave surface of the bottom layer. The diameter of the grinding layer is 250mm, the length of the grinding layer is 100mm, and the length of the bottom layer is 30 mm. Six embedded nuts are embedded on the end face, far away from the grinding layer, of the bottom layer, and the six embedded nuts are distributed around the axis of the bottom layer at even intervals.
The bottom layer is prepared from the following raw materials in parts by weight: 8 parts of chromium sand, 1.5 parts of phenolic resin A and 0.5 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 8 parts of white corundum, 0.8 part of green silicon carbide, 0.3 part of epoxy resin, 0.20 part of dibutyl ester and 0.95 part of phenolic resin B.
Wherein, the granularity of the chrome sand in the bottom layer raw material is 36 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 55: 105. The gypsum in the bottom layer raw material is semi-hydrated gypsum powder.
The grain size of the white corundum in the grinding layer raw material is 180#, and the grain size of the green silicon carbide is 2000 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin liquid 860, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps:
1) adding the chrome sand into a mixing pot, then adding the phenolic resin liquid 2124, stirring for 10min at the rotating speed of 55rpm, then adding the gypsum powder, stirring for 4min at the rotating speed of 64rpm, then adding the phenolic resin powder 2123, stirring for 3min at the rotating speed of 40rpm, and obtaining a uniformly mixed bottom layer raw material;
heating the epoxy resin liquid to 80 ℃, then adding dibutyl ester, uniformly mixing, and cooling to obtain a mixed liquid for later use;
adding white corundum into a mixing pot, adding the mixed solution, stirring at the rotating speed of 55rpm for 1.5h, adding green silicon carbide, stirring at the rotating speed of 40rpm for 1.5h, adding phenolic resin powder, and stirring at the rotating speed of 32rpm for 30min to obtain a uniformly mixed grinding layer raw material;
2) in the mould, fix embedded nut in the cavity bottom of mould through fixing bolt, then to adding the bottom raw materials of misce bene in the mould cavity, shakeout, then scrape out the conical concave surface that middle low both sides are high with the surface after the scraper blade will shakeout, then go into the grinding layer raw materials of misce bene on the conical concave surface, then adopt the pressure head that has spherical surface to 20N/mm 2 The pressure of (3) is pressed and formed;
3) heating to 90 ℃ within 5h, heating to 130 ℃ within 18h, heating to 165 ℃ within 5h, keeping the temperature for 7h, and cooling to room temperature.
Example 2
The bearing roller ball base surface grinding non-magnetic grinding wheel comprises a bottom layer and a grinding layer arranged on the bottom layer, and the specific structure of the grinding wheel is the same as that of the grinding wheel in the embodiment 1.
The bottom layer is prepared from the following raw materials in parts by weight: 12 parts of chromium sand, 2.0 parts of phenolic resin A and 0.8 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 10 parts of white corundum, 1.5 parts of green silicon carbide, 0.6 part of epoxy resin, 0.3 part of dibutyl ester and 1.2 parts of phenolic resin B.
Wherein, the granularity of the chromium sand in the bottom layer raw material is 50 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 50: 120. The gypsum in the bottom layer raw material is semi-hydrated gypsum powder.
The white corundum in the grinding layer raw material has a granularity of 280#, and the green silicon carbide has a granularity of 3000 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps:
1) adding the chrome sand into a mixing pot, then adding the phenolic resin liquid 2124, stirring for 15min at the rotating speed of 45rpm, then adding the gypsum powder, stirring for 3min at the rotating speed of 70rpm, then adding the phenolic resin powder 2123, stirring for 7min at the rotating speed of 30rpm, and obtaining a uniformly mixed bottom layer raw material;
heating the epoxy resin liquid to 80 ℃, then adding dibutyl ester, uniformly mixing, and cooling to obtain a mixed liquid for later use;
adding white corundum into a mixing pot, adding the mixed solution, stirring at a rotating speed of 65rpm for 1h, adding green silicon carbide, stirring at a rotating speed of 50rpm for 1h, adding phenolic resin powder, and stirring at a rotating speed of 30rpm for 40min to obtain a uniformly mixed grinding layer raw material;
2) in the mould, fix the embedded nut in the cavity bottom of mould through fixing bolt, then add the bottom raw materials of misce bene in to the mould cavity, shakeout, then scrape out the conical concave surface that low both sides are high in the middle of with the surface after shakeout with the scraper blade, then go into the grinding layer raw materials of misce bene on the conical concave surface, then adopt the pressure head that has spherical surface to 30N/mm 2 The pressure of (3) is pressed and formed;
3) then heating to 100 ℃ within 4h, then heating to 140 ℃ within 20h, then heating to 160 ℃ within 4h, keeping the temperature for 8h, and cooling to room temperature to obtain the product.
Example 3
The bearing roller ball base surface grinding non-magnetic grinding wheel comprises a bottom layer and a grinding layer arranged on the bottom layer, and the specific structure of the grinding wheel is the same as that of the grinding wheel in the embodiment 1.
The bottom layer is prepared from the following raw materials in parts by weight: 10 parts of chromium sand, 1 part of ground powder, 1.7 parts of phenolic resin A and 0.6 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 9 parts of white corundum, 1 part of green silicon carbide, 0.4 part of epoxy resin, 0.25 part of dibutyl ester and 1.05 parts of phenolic resin B.
Wherein, the granularity of the chromium sand in the bottom layer raw material is 46 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 40: 100. The gypsum in the bottom layer raw material is semi-hydrated gypsum powder.
The white corundum in the grinding layer raw material has a granularity of 240#, and the green silicon carbide has a granularity of 2500 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps:
1) adding the chromium sand and the ground powder into a mixing pot, uniformly mixing, then adding the phenolic resin liquid 2124, stirring at the rotating speed of 50rpm for 12min, then adding the gypsum powder, stirring at the rotating speed of 60rpm for 5min, then adding the phenolic resin powder 2123, stirring at the rotating speed of 35rpm for 5min, and obtaining a uniformly mixed bottom layer raw material;
heating the epoxy resin liquid to 80 ℃, then adding dibutyl ester, uniformly mixing, and cooling to obtain a mixed liquid for later use;
adding white corundum into a mixing pot, adding the mixed solution, stirring at the rotating speed of 60rpm for 1.2h, adding green silicon carbide, stirring at the rotating speed of 45rpm for 1.2h, adding phenolic resin powder, and stirring at the rotating speed of 40rpm for 28min to obtain a uniformly mixed grinding layer raw material;
2) in the mould, fix embedded nut in the cavity bottom of mould through fixing bolt, then to adding the bottom raw materials of misce bene in the mould cavity, shakeout, then scrape out the conical concave surface that middle low both sides are high with the surface after the scraper blade will shakeout, then go into the grinding layer raw materials of misce bene on the conical concave surface, then adopt the pressure head that has spherical surface to 22N/mm 2 The pressure of (3) is pressed and formed;
3) heating to 100 ℃ within 3h, heating to 130 ℃ within 22h, heating to 165 ℃ within 3h, keeping the temperature for 6h, and cooling to room temperature to obtain the product.
Example 4
The bearing roller ball base surface grinding non-magnetic grinding wheel comprises a bottom layer and a grinding layer arranged on the bottom layer, and the specific structure of the grinding wheel is the same as that of the grinding wheel in embodiment 1.
The bottom layer is prepared from the following raw materials in parts by weight: 10 parts of chromium sand, 1.5 parts of ground powder, 1.7 parts of phenolic resin A and 0.6 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 9 parts of white corundum, 1 part of green silicon carbide, 0.4 part of epoxy resin, 0.25 part of dibutyl ester, 1.05 parts of phenolic resin B, 0.5 part of elastic reinforcing agent, 0.3 part of ethylene-maleic anhydride-vinyl acetate copolymer and 0.05 part of cerium oxide.
Wherein, the granularity of the chromium sand in the bottom layer raw material is 46 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 50: 120. The gypsum in the bottom layer raw material is semi-hydrated gypsum powder.
The white corundum in the grinding layer raw material has a granularity of 240#, and the green silicon carbide has a granularity of 2500 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The elasticity enhancer consists of silica sol and acetylene black in the weight ratio of 10: 5.
The production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps:
1) adding the chromium sand and the ground powder into a mixing pot, uniformly mixing, then adding the phenolic resin liquid 2124, stirring at the rotating speed of 50rpm for 12min, then adding the gypsum powder, stirring at the rotating speed of 60rpm for 5min, then adding the phenolic resin powder 2123, stirring at the rotating speed of 35rpm for 5min, and obtaining a uniformly mixed bottom layer raw material;
heating the epoxy resin liquid to 80 ℃, then adding dibutyl ester, uniformly mixing, and cooling to obtain a mixed liquid for later use;
adding white corundum into the mixing pot, adding the mixed solution, stirring at the rotating speed of 60rpm for 1.2h, and adding green silicon carbideStirring for 1.2h at the rotating speed of 45rpm, adding phenolic resin powder, stirring for 28min at the rotating speed of 40rpm, adding an elastic reinforcing agent, an ethylene-maleic anhydride-vinyl acetate copolymer and cerium oxide, and uniformly mixing to obtain a uniformly mixed grinding layer raw material; 2) in the mould, fix the embedded nut in the cavity bottom of mould through fixing bolt, then add the bottom raw materials of misce bene in to the mould cavity, shakeout, then scrape out the conical concave surface that middle low both sides are high with the surface after the scraper blade will shakeout, then go into the grinding layer raw materials of misce bene on the conical concave surface, then adopt the pressure head that has spherical surface to 22N/mm 2 The pressure of (3) is pressed and formed;
3) heating to 100 ℃ within 3h, heating to 130 ℃ within 22h, heating to 165 ℃ within 5h, keeping the temperature for 7h, and cooling to room temperature.
Comparative example 1
The grinding wheel of this comparative example includes a ground layer and a grinding layer provided on the ground layer, and the specific structure is the same as that of the grinding wheel in example 1.
The bottom layer of the grinding wheel of the comparative example is prepared from the following raw materials in parts by weight: 8 parts of chromium sand and 1.5 parts of phenolic resin A, wherein the grinding layer is prepared from the following raw materials in parts by weight: 8 parts of white corundum, 0.8 part of green silicon carbide, 0.3 part of epoxy resin, 0.20 part of dibutyl ester and 0.95 part of phenolic resin B.
Wherein, the granularity of the chromium sand in the bottom layer raw material is 36 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 55: 105.
The grain size of the white corundum in the grinding layer raw material is 180#, and the grain size of the green silicon carbide is 2000 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The process for producing the grinding wheel of this comparative example refers to the process for producing the grinding wheel of example 1.
Comparative example 2
The grinding wheel of this comparative example includes a ground layer and a grinding layer provided on the ground layer, and the specific structure is the same as that of the grinding wheel in example 1.
The bottom layer of the grinding wheel of the comparative example is prepared from the following raw materials in parts by weight: 8 parts of chromium sand, 1.5 parts of phenolic resin A and 0.5 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 8 parts of white corundum, 0.3 part of epoxy resin, 0.20 part of dibutyl ester and 0.95 part of phenolic resin B.
Wherein, the granularity of the chrome sand in the bottom layer raw material is 36 #. The phenolic resin A in the bottom layer raw material consists of phenolic resin liquid 2124 and phenolic resin powder 2123 according to the mass ratio of 55: 105.
The grain size of the white corundum in the grinding layer raw material is 180 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The process for producing the grinding wheel of this comparative example refers to the process for producing the grinding wheel of example 1.
Comparative example 3
The grinding wheel of this comparative example includes a ground layer and a grinding layer provided on the ground layer, and the specific structure is the same as that of the grinding wheel in example 1.
The bottom layer of the grinding wheel of the comparative example is prepared from the following raw materials in parts by weight: 8 parts of chromium sand, 1.5 parts of phenolic resin A and 0.5 part of gypsum powder, wherein the grinding layer is prepared from the following raw materials in parts by weight: 8 parts of white corundum, 0.8 part of green silicon carbide, 0.3 part of epoxy resin, 0.20 part of dibutyl ester and 0.95 part of phenolic resin B.
Wherein, the granularity of the chromium sand in the bottom layer raw material is 36 #. The phenolic resin A in the bottom layer raw material is phenolic resin liquid 2124. The gypsum in the bottom layer raw material is semi-hydrated gypsum powder.
The grain size of the white corundum in the grinding layer raw material is 180#, and the grain size of the green silicon carbide is 2000 #. The epoxy resin in the raw materials of the grinding layer is epoxy resin 860, the epoxy resin is epoxy resin liquid, the solid content is 99%, and the viscosity is 10000 mPas. The phenolic resin B is phenolic resin powder, specifically phenolic resin 2123.
The process for producing the grinding wheel of this comparative example refers to the process for producing the grinding wheel of example 1.
Test examples
The ball-based surfaces of the bearing rollers of examples 1 to 4 were ground to obtain non-magnetic grinding wheels and the grinding wheels of comparative examples 1 to 3, and their performances were measured according to the following test methods, and the test results are shown in Table 1.
1) Measuring the Rockwell hardness of the grinding wheel by adopting a Rockwell hardness tester, wherein a pressure head is a quenched steel ball, the diameter of the quenched steel ball is 3.175mm, and the load is 588N;
2) obtaining the surface roughness of the grinding layer of the grinding wheel by a method of randomly taking points and solving the arithmetic square root of the points by using a handheld roughness meter;
3) testing the load of the grinding wheel during breaking on a universal material testing machine by adopting a three-point bending method, and calculating the breaking strength of the grinding wheel; 4) testing the impact strength of the alloy by using an impact testing machine;
5) and (4) continuously grinding the tapered roller, and testing the service life of the grinding wheel.
TABLE 1 comparison of grinding wheel Performance in examples 1-4 and comparative examples 1-3
By combining the example 1 and the comparative example 1 and combining the table 1, the bearing roller ball base surface grinding non-magnetic grinding wheel of the application has the advantage that the flexural strength is increased after the gypsum powder is added to the bottom layer.
As can be seen by combining the example 1 and the comparative example 2 and combining the table 1, the grinding layer of the bearing roller ball base surface grinding non-magnetic grinding wheel adopts green silicon carbide and white corundum as grinding materials, and the breaking strength and the impact strength are high.
By combining the embodiment 1 and the comparative example 3 and combining the table 1, the grinding layer of the bearing roller ball base surface grinding non-magnetic grinding wheel provided by the application adopts two phenolic resins as main components of the binding agent, so that the surface roughness of the grinding layer can be reduced, and the flexural strength is improved.
The ball base surface grinding non-magnetic grinding wheel for the bearing roller has excellent mechanical property, and the processed tapered roller has good surface quality.
Claims (2)
1. The utility model provides a bearing roller ball base face grinding does not have magnetic grinding emery wheel, includes the bottom and sets up the grinding layer on the bottom, its characterized in that, the bottom is mainly made by the bottom raw materials of following parts by weight: 8-12 parts of chromium sand, 1.5-2.0 parts of phenolic resin A and 0.5-0.8 part of gypsum powder, wherein the grinding layer is mainly prepared from the following raw materials in parts by weight: 8-10 parts of white corundum, 0.8-1.5 parts of green silicon carbide, 0.3-0.6 part of epoxy resin, 0.2-0.3 part of dibutyl ester and 0.95-1.2 parts of phenolic resin B;
the phenolic resin A in the bottom layer raw material consists of phenolic resin liquid and phenolic resin powder in a mass ratio of 35-55: 100-120;
epoxy resin in the raw material of the grinding layer is epoxy resin liquid, and phenolic resin B in the raw material of the grinding layer is phenolic resin powder;
the granularity of the chromium sand in the bottom layer raw material is any one of 36#, 46#, and 50 #;
the granularity of the white corundum in the grinding layer raw material is any one of 180#, 240#, and 280 #; the granularity of the green silicon carbide in the grinding layer raw material is any one of 2000#, 2500#, and 3000 #;
the production process of the bearing roller ball base surface grinding non-magnetic grinding wheel comprises the following steps:
1) adding the uniformly mixed raw material of the bottom layer into a die, flattening, adding the uniformly mixed raw material of the grinding layer, and scraping;
2) pressing and molding by using a pressing head with a spherical convex surface; then heating to 90-100 ℃ within 3-5h, then heating to 130-140 ℃ within 16-22h, then heating to 160-165 ℃ within 3-5h, preserving the heat for 6-8h, and cooling to obtain the product;
the bottom layer raw material uniformly mixed in the step 1) is prepared by a method comprising the following steps: uniformly mixing the chromium sand with the phenolic resin liquid, then uniformly mixing the chromium sand with the gypsum powder, and then uniformly mixing the chromium sand with the phenolic resin powder;
the grinding layer raw material uniformly mixed in the step 1) is prepared by the method comprising the following steps: uniformly mixing the epoxy resin liquid and dibutyl ester, adding white corundum, uniformly mixing, adding green silicon carbide, uniformly mixing, adding phenolic resin B, and uniformly mixing, wherein the phenolic resin B is phenolic resin powder;
in the step 1), an embedded part is fixed in a mould before the bottom layer raw material is added.
2. The bearing roller ball base surface grinding non-magnetic grinding wheel as claimed in claim 1, wherein the bottom layer is mainly made of the following raw materials in parts by weight: 10 parts of chromium sand, 1.7 parts of phenolic resin A and 0.6 part of gypsum powder, wherein the grinding layer is mainly prepared from the following raw materials in parts by weight: 9 parts of white corundum, 1 part of green silicon carbide, 0.4 part of epoxy resin, 0.25 part of dibutyl ester and 1.05 parts of phenolic resin B.
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| CN103406837A (en) * | 2013-07-04 | 2013-11-27 | 山东英特磨具有限公司 | Fiber-reinforced resin abrasive cutting wheel and preparation method thereof |
| CN103465180A (en) * | 2013-09-05 | 2013-12-25 | 宁波大华砂轮有限公司 | Slice resin grinding wheel and preparation method thereof |
| CN106002665A (en) * | 2016-05-30 | 2016-10-12 | 莒南县合兴磨料磨具公共技术服务中心 | Resin grinding wheel and preparation method thereof |
| CN106040962A (en) * | 2016-07-29 | 2016-10-26 | 无锡市三峰仪器设备有限公司 | Instrument casting resin sand enhanced by alkali free glass fibers |
| CN108857930A (en) * | 2018-05-30 | 2018-11-23 | 安徽佑开科技有限公司 | A kind of CBN grinding wheel formula |
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