CN111331528A - Centerless grinding wheel for plunge grinding of slender shaft parts and preparation method thereof - Google Patents
Centerless grinding wheel for plunge grinding of slender shaft parts and preparation method thereof Download PDFInfo
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- CN111331528A CN111331528A CN202010315896.8A CN202010315896A CN111331528A CN 111331528 A CN111331528 A CN 111331528A CN 202010315896 A CN202010315896 A CN 202010315896A CN 111331528 A CN111331528 A CN 111331528A
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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
- 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
- B24D3/32—Resins or natural or synthetic macromolecular compounds for porous or cellular structure
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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
- B24D3/342—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 incorporated in the bonding agent
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- 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
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- 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
Abstract
The invention relates to a centerless grinding wheel for cutting-in grinding of slender shaft parts, which consists of a base body and an abrasive layer, wherein the abrasive layer is arranged on the outer circumferential side wall of the base body, the inner side of the base body is circumferentially provided with an annular groove or is uniformly provided with a plurality of weight reduction grooves around the central line, the abrasive layer consists of the following raw materials, by weight, 21-60.5% of diamond abrasive, 12.5-21% of phenolic resin powder or modified phenolic resin powder, 5-45% of β -SiC abrasive, 5-18% of carbonyl iron powder, 1-5% of chromium oxide, 2-5% of foam diamond filler and 0.5-3.5% of wetting agent, the grinding wheel improves the processing precision and meets the requirement of high processing precision of products, and has better sharpness, service life and polishing performance, and the excircle runout of processed workpieces can reach less than or equal to 0.025 mm.
Description
Technical Field
The invention belongs to the technical field of efficient precision grinding processing, and particularly relates to a centerless grinding wheel for plunge grinding of slender shaft parts and a preparation method thereof.
Background
The slender shaft refers to a shaft part with the length-diameter ratio L/D more than or equal to 20. The slender shaft has a large length-diameter ratio, so that the workpiece is easy to vibrate and bend and deform under the influence of grinding resistance, grinding heat and the like in the grinding process, the form and position accuracy such as taper, roundness, jumping and the like is difficult to ensure, and the processing is difficult. Therefore, the centerless grinding wheel for grinding the slender shaft part is urgently needed to be invented, and the technical problem that the workpiece is difficult to process is solved.
Disclosure of Invention
The invention aims to overcome the defect that the conventional slender shaft parts are difficult to grind and process with high precision, and provides a centerless grinding wheel for the plunge grinding of the slender shaft parts, which can improve the processing precision and meet the requirement of the products on high processing precision.
The invention also provides a preparation method of the centerless grinding wheel for the plunge grinding of the slender shaft part.
In order to achieve the purpose, the invention adopts the following technical scheme:
a centerless grinding wheel for cutting-in grinding of slender shaft parts is composed of a base body and a grinding layer, wherein the grinding layer is arranged on the outer circumferential side wall of the base body, and an annular groove is formed in the inner side of the base body along the circumferential direction or a plurality of weight reduction grooves are uniformly formed in the inner side of the base body around the central line.
Specifically, an annular groove or a weight-reducing groove may be hollowed out at a position near the inner circumference of the upper end face and/or the lower end face of the base body.
The centerless grinding wheel for cutting-in grinding of the slender shaft part comprises, by weight, 21-60.5% of diamond grinding materials, 12.5-21% of phenolic resin powder or modified phenolic resin powder, 5-45% of β -SiC grinding materials, 5-18% of carbonyl iron powder, 1-5% of chromium oxide, 2-5% of foamed diamond filler and 0.5-3.5% of wetting agents.
Further, the diamond abrasive is one or more than two of single crystal diamond, polycrystalline diamond and plated metal diamond, and the plated diamond comprises nickel-plated diamond, copper-plated diamond or titanium-plated diamond.
Further, the wetting agent is m-cresol or a silane coupling agent.
More preferably, the particle size of the foam diamond filler is 10-40 μm.
The invention provides a preparation method of the centerless grinding wheel for cutting-in grinding of the slender shaft part, which comprises the following steps:
1) taking raw materials of the abrasive layer according to a proportion, and uniformly mixing to obtain a molding material;
2) hot-pressing the molding material obtained in the step 1) to obtain a grinding wheel block blank;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve, and obtaining a grinding wheel finished product through a subsequent conventional processing procedure after hardening.
Specifically, the hot-press molding conditions in the step 2) are as follows: the hot-press forming temperature is 165-205 ℃, the hot-press time is 45-110 min, and the pressure is 5-25 MPa.
Specifically, the hardening conditions in the step 3) are as follows: and (3) placing the grinding wheel blank in a hardening oven, raising the room temperature to 100 ℃ after 2 hours, preserving the heat for 2 hours, raising the temperature to 175-210 ℃ after 2 hours, preserving the heat for 12 hours, naturally cooling to below 30 ℃, and taking out.
In a grinding material layer formula system of the centerless grinding wheel for cutting and grinding slender shaft parts, β -SiC grinding material crystal forms are close to diamond, the degree of finish and the polishing performance are far beyond white corundum and α -SiC (black silicon carbide and green silicon carbide), when the temperature is above 1600 ℃, β -SiC still has ultrahigh strength and has excellent heat conductivity and low expansion coefficient, so that the thermal stress applied to the slender shaft parts in the heating and cooling processes is small, the abrasive resistance and the polishing performance of the grinding wheel are improved, and the foam diamond filler with the grain size of 10-40 mu m has a porous foam-shaped structure, has a certain grinding and polishing effect, and meanwhile, the lower strength supports the high self-sharpening performance of the slender shaft parts, so that the sharpness of the grinding wheel tissue can be effectively improved, and the continuous self-sharpening capability is improved.
The grinding wheel is manufactured by adopting a general resin bond diamond centerless grinding wheel manufacturing method, and the specific steps are as follows: designing a mould and a mould unloading tool according to the size of a grinding wheel, designing a formula of an abrasive layer according to technical parameters of a grinding workpiece, mixing raw material substances into uniform molding materials according to a mixing process in proportion, preparing the grinding wheel according to a certain hot-press molding process through a hot press, hardening a blank of a grinding wheel block after hot pressing according to a designed hardening curve, carrying out subsequent conventional processing procedures on the hardened blank of the grinding wheel block (such as multi-piece bonding assembly, rough turning of a base body, finish turning of the base body, determination of a base body reference surface, finish turning of a base body aperture, trimming and edging of the end surface and the excircle of the abrasive layer of the grinding wheel, dynamic balancing and the like), and finally inspecting and warehousing to obtain a finished grinding wheel.
The key points of the invention are the design of the grinding wheel structure, the design of the formula of the grinding material layer and the preparation process of the grinding wheel. Compared with the prior art, the design of the weight-reducing groove in the grinding wheel structure improves the grinding wheel counterweight (at least reducing the weight by more than 20 kg), and is more beneficial to the safety of high-speed rotation of the grinding wheel; the formula design of the abrasive layer improves the comprehensive performance of the grinding wheel and the processing precision of a processed workpiece. The characteristics solve the problems of difficult processing and low processing precision of slender shaft parts, and improve the processing precision and the batch application level of production.
The centerless grinding wheel for the plunge grinding of the slender shaft parts is prepared by adopting a certain formula of a grinding material layer and a production process, the processing precision is improved, the requirement of the products on high processing precision is met, and the problem that the existing slender shaft parts are difficult to grind and process in high precision is solved.
Compared with the prior art, the invention has the following beneficial effects:
the invention reduces the whole weight of the grinding wheel by adopting a matrix hollowing mode, the weight reduction proportion is 10-20%, the cost of raw materials is obviously reduced, and the centerless grinding wheel for the plunge grinding of the slender shaft part is prepared by adopting a specific formula of a grinding material layer and a production process, so that the processing precision is improved, and the requirement of high processing precision of the product is met; the grinding wheel has good sharpness, long service life and polishing performance, and the excircle runout of a processed workpiece can reach less than or equal to 0.025 mm.
Drawings
FIG. 1 is a schematic structural view of a centerless grinding wheel for plunge grinding of a slender shaft part according to the invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
Unless otherwise specifically stated, various raw materials used in the following examples of the present invention, such as diamond abrasives (56% electroless nickel, 30% electroless nickel, and 50% titanium), phenolic resin powders, aromatic hydrocarbon-modified phenolic resin powders, silicone-modified phenolic resin powders, β -SiC abrasives, carbonyl iron powders, chromium oxides, foamed diamond fillers, wetting agents, and the like, were all common commercial products.
Wherein the aromatic modified phenolic resin powder and the organic silicon modified phenolic resin powder are purchased from Vast chemical company in America, the β -SiC abrasive is purchased from Shaanxi Kebor GmbH, and the foam diamond filler is purchased from Cuctu Heifeng Diamond science and technology GmbH.
Example 1
As shown in figure 1, the centerless grinding wheel for the plunge grinding of the slender shaft part is composed of an aluminum substrate 1 and an abrasive layer 2, wherein the abrasive layer 2 is arranged on the outer circumferential side wall of the aluminum substrate 1, and an annular groove 3 is formed in the inner side of the aluminum substrate 1 along the circumferential direction. Specifically, in the embodiment, the centerless grinding wheel for plunge grinding of the slender shaft part is formed by sequentially bonding and assembling a single grinding wheel A, a grinding wheel B, a grinding wheel C, a grinding wheel D and a grinding wheel E from top to bottom; the upper end faces of the aluminum substrates 1 of the grinding wheels A to E are hollowed out near the inner circumference to form annular grooves 3 for reducing weight. The lower end face of the aluminum base 1 of the grinding wheel E located at the lowermost layer is also hollowed out at a position near the inner circumference to form an annular groove 3 for weight reduction. The specific grinding wheel model specification is: 9a 1610 304.8 10D 120/140B 100, the grinding wheel weight reduction ratio was 16.9%.
The matrix is hollowed out according to the specific model specification design of the grinding wheel, taking 9A 1610 × 405 × 304.8 × 10 as an example, the total weight of the grinding wheel without hollowing is about 252kg, and the grinding wheel is assembled by 5 pieces of the grinding wheel A, B, C, D, E, wherein the thickness of the matrix of the grinding wheel A is 16% of the total thickness; B. c, D, E the thickness of each grinding wheel base is 21% of the total thickness of the grinding wheel, the four bases are all designed to be hollowed, the hollowed dimension comprises diameter and thickness, the diameter is 82% of the diameter of the grinding wheel, and the thickness is 7.6% of the total thickness of the grinding wheel. And (3) weight loss proportion calculation: the density of the aluminum substrate material is 2.8 g/cm3The total weight loss volume is 15204cm3The weight loss was 42.6kg, the weight loss ratio was 16.9%.
The centerless grinding wheel for cutting and grinding the slender shaft part comprises a grinding material layer and a grinding material layer, wherein the grinding material layer comprises, by weight, 60.5% of diamond grinding materials with 56% of chemical nickel plating, 21% of aromatic hydrocarbon modified phenolic resin powder, 5% of β -SiC grinding materials with the particle size of 15 microns, 5% of carbonyl iron powder with the particle size of 10 microns, 1% of chromium oxide, 4% of foamed diamond filler with the particle size of 10 microns and 3.5% of cresol wetting agents, and an aluminum substrate is customized according to a pre-designed size and is directly used when a grinding wheel blank is formed.
The preparation method of the centerless grinding wheel for cutting-in grinding of the slender shaft part comprises the following steps:
1) uniformly mixing a diamond abrasive material with 56% of chemical nickel plating, aromatic hydrocarbon modified phenolic resin powder, β -SiC abrasive material, carbonyl iron powder, chromium oxide, foam diamond filler and a wetting agent according to a proportion to obtain a molding material;
2) selecting a matrix required by a grinding wheel A, B, C, D, E and the like, assembling an assembly mold such as a mold outer ring, a mold core, a pressure head and the like, preparing an auxiliary molding tool, and performing hot press molding on the molding material obtained in the step 1) to obtain a grinding wheel blank; the hot-press molding conditions are as follows: hot-press molding temperature is 205 ℃, hot-press time is 110min, and pressure is 22 MPa;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve (the grinding wheel blank is placed in a hardening oven, the room temperature is increased to 100 ℃ after 2 hours, the temperature is kept for 2 hours, the temperature is increased to 210 ℃ after 2 hours, the temperature is kept for 12 hours, the grinding wheel blank is naturally cooled to below 30 ℃ and taken out), and obtaining a grinding wheel finished product through subsequent conventional processing procedures (such as a plurality of pieces of bonding assembly, matrix rough turning, matrix finish turning, matrix reference surface determination, matrix aperture finish turning, grinding wheel abrasive layer end surface and excircle trimming edging, dynamic balancing and the like).
Example 2
A centerless grinding wheel for cutting-in grinding of slender shaft parts is composed of a base body and an abrasive layer, wherein the abrasive layer is arranged on the outer circumferential side wall of the base body, and a plurality of weight reduction grooves are uniformly formed in the inner side of the base body around the central line. The upper end surface of the base body is hollowed at a position close to the inner circumference to form a weight reduction groove. The specific grinding wheel model specification is: 9a 1610 × 304.8 × 10D 100/120B 100, the grinding wheel weight reduction ratio is 15.2%.
The centerless grinding wheel for cutting and grinding the slender shaft part comprises the following raw materials, by weight, 21% of diamond grinding material, 12.5% of organic silicon modified phenolic resin powder, 45% of β -SiC grinding material with the particle size of 10 microns, 15% of carbonyl iron powder with the particle size of 20 microns, 3% of chromium oxide, 3% of foamed diamond filler with the particle size of 20 microns and 0.5% of m-cresol wetting agent.
The preparation method of the centerless grinding wheel for cutting-in grinding of the slender shaft part comprises the following steps:
1) taking raw materials of the abrasive layer according to a proportion, and uniformly mixing to obtain a molding material;
2) hot-pressing the molding material obtained in the step 1) to obtain a grinding wheel block blank; the hot-press molding conditions are as follows: hot-press molding temperature is 200 ℃, hot-press time is 45min, and pressure is 18 MPa;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve (the grinding wheel blank is placed in a hardening oven, the room temperature is increased to 100 ℃ after 2 hours, the temperature is kept for 2 hours, the temperature is increased to 205 ℃ after 2 hours, the temperature is kept for 12 hours, the grinding wheel blank is naturally cooled to below 30 ℃ and taken out), and obtaining a grinding wheel finished product through subsequent conventional processing procedures (such as a plurality of pieces of bonding assembly, matrix rough turning, matrix finish turning, matrix reference surface determination, matrix aperture finish turning, grinding wheel abrasive layer end surface and excircle trimming edging, dynamic balancing and the like).
Example 3
The centerless grinding wheel for cutting-in grinding of slender shaft parts consists of two parts, including diamond abrasive 40 wt%, phenolic resin powder 12.5 wt%, 5 micron β -SiC abrasive 25 wt%, 5 micron carbonyl iron powder 11 wt%, chromium oxide 5 wt%, foamed diamond stuffing of 28 micron size 5 wt%, silane coupling agent KH550 wetting agent 1.5 wt% and other reference example 1. the specific grinding wheel has model number of 9A 1610 355 304.8 10D 120/140B 100 and weight reducing ratio of 15.1 wt%.
The preparation method of the centerless grinding wheel for cutting-in grinding of the slender shaft part comprises the following steps:
1) taking raw materials of the abrasive layer according to a proportion, and uniformly mixing to obtain a molding material;
2) hot-pressing the molding material obtained in the step 1) to obtain a grinding wheel block blank; the hot-press molding conditions are as follows: hot press molding temperature is 165 ℃, hot press time is 60min, and pressure is 21 MPa;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve (the grinding wheel blank is placed in a hardening oven, the room temperature is increased to 100 ℃ after 2 hours, the temperature is kept for 2 hours, the temperature is increased to 175 ℃ after 2 hours, the temperature is kept for 12 hours, the grinding wheel blank is naturally cooled to below 30 ℃ and taken out), and obtaining a grinding wheel finished product through subsequent conventional processing procedures (such as a plurality of pieces of bonding assembly, matrix rough turning, matrix finish turning, matrix reference surface determination, matrix aperture finish turning, grinding wheel abrasive layer end surface and excircle trimming edging, dynamic balancing and the like).
Example 4
A centerless grinding wheel for cutting and grinding slender shaft parts is composed of a base body and an abrasive layer, wherein the abrasive layer is composed of, by weight, 48% of diamond abrasive coated with titanium by 50%, 21% of phenolic resin powder, 10% of β -SiC abrasive coated with 20 microns, 12% of carbonyl iron powder coated with 20 microns, 4% of chromium oxide, 3% of foamed diamond filler with the particle size of 40 microns, 1% of m-cresol wetting agent and 1% of silane coupling agent KH792 wetting agent, and according to other reference examples 1, the specific specification of the grinding wheel is 9A 1610 405 304.8X 5D 120/140B 100, and the weight reduction ratio of the grinding wheel is 16.8%.
The preparation method of the centerless grinding wheel for cutting-in grinding of the slender shaft part comprises the following steps:
1) taking raw materials of the abrasive layer according to a proportion, and uniformly mixing to obtain a molding material;
2) hot-pressing the molding material obtained in the step 1) to obtain a grinding wheel block blank; the hot-press molding conditions are as follows: hot-press molding temperature is 185 ℃, hot-press time is 80min, and pressure is 20 MPa;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve (the grinding wheel blank is placed in a hardening oven, the room temperature is increased to 100 ℃ after 2 hours, the temperature is kept for 2 hours, the temperature is increased to 190 ℃ after 2 hours, the temperature is kept for 12 hours, the grinding wheel blank is naturally cooled to below 30 ℃ and taken out), and obtaining a grinding wheel finished product through subsequent conventional processing procedures (such as a plurality of pieces of bonding assembly, matrix rough turning, matrix finish turning, matrix reference surface determination, matrix aperture finish turning, grinding wheel abrasive layer end surface and excircle trimming edging, dynamic balancing and the like).
Comparative examples
Comparative example 9a 1610 405 304.8D 10D 120/140B 100 model specification resin bond diamond centerless grinding wheel with no hollowed out base, total weight of grinding wheel 252kg, abrasive layer formulation (weight percent) of grinding wheel: 45% of diamond abrasive, 18% of phenolic resin powder, 15% of 64 μm green SiC abrasive, 12% of 50 μm copper powder, 5% of chromium oxide, 3% of calcium oxide and 2% of polyvinyl alcohol wetting agent, and the grinding wheel is prepared by adopting the conventional resin binder centerless grinding wheel preparation process in the field.
For the specific processing case, taking a grinding wheel with the specification of 9a 1610 × 405 × 304.8 × 10 as an example, regarding 300 slender axles and bars of YG8 with the specification of Φ 8mm × 330mm, with a single grinding allowance of 0.50mm, a grinding comparison test was conducted, and the grinding process parameters were: the grinding wheel rotating speed is 1200 rpm, the guide wheel rotating speed is 18rpm, the feed speed is 0.10mm/min, and the single feed amount is 0.05-0.10 mm.
The grinding test results of the resin bond diamond centerless grinding wheel manufactured in the embodiments 1 to 4 of the invention and the grinding wheel manufactured in the comparative embodiment show that:
1) the grinding main shafts of the centerless grinding wheels manufactured in the embodiments 1 to 4 have lower power than the grinding wheels of the comparative embodiments, the dressing times are less, the single feed amount is larger, the outer circle run-out of a workpiece can be less than 0.025mm, the grinding performance of the grinding wheels is better than that of the comparative embodiments, and the processing precision is also high;
2) the single maximum feed amount, the finishing times, the excircle runout precision of the machined workpiece and the surface roughness precision of the workpiece in the embodiment 1 are all superior to those of other embodiments, and the comprehensive performance is best;
3) the single maximum feed amount of the example 4 is equal to that of the comparative example, but the trimming times, the outer circle run-out precision of the machined workpiece and the surface roughness precision of the machined workpiece are all superior to those of the comparative example;
4) comparison of example 1 with the comparative example in terms of weight, the grinding wheel of the comparative example had a total weight of 252kg and the grinding wheel of example 1 had a total weight of 209.4kg, which was a weight reduction of about 16.9%.
Claims (9)
1. The centerless grinding wheel for the plunge grinding of the slender shaft part is characterized by comprising a base body and an abrasive layer, wherein the abrasive layer is arranged on the outer circumferential side wall of the base body, and the inner side of the base body is provided with an annular groove along the circumferential direction or a plurality of weight reduction grooves uniformly around the central line.
2. The centerless grinding wheel for plunge grinding of an elongated shaft component as claimed in claim 1, wherein the upper end face and/or the lower end face of the base body is hollowed out at a position near the inner circumference to form an annular groove or a weight-reducing groove.
3. The centerless grinding wheel for plunge grinding of the slender shaft part according to claim 1 or 2, wherein the grinding material layer is composed of, by weight, 21-60.5% of diamond grinding materials, 12.5-21% of phenolic resin powder or modified phenolic resin powder, 5-45% of β -SiC grinding materials, 5-18% of carbonyl iron powder, 1-5% of chromium oxide, 2-5% of foam diamond filler and 0.5-3.5% of wetting agents.
4. The centerless grinding wheel for plunge grinding of the elongated shaft part according to claim 3, wherein the diamond abrasive is one or more of single crystal diamond, polycrystalline diamond and plated metal diamond, and the plated diamond comprises nickel-plated diamond, copper-plated diamond or titanium-plated diamond.
5. The centerless grinding wheel for plunge grinding of an elongated shaft part according to claim 3, wherein the wetting agent is m-cresol or a silane coupling agent.
6. The centerless grinding wheel for plunge grinding of the elongated shaft part as claimed in claim 3, wherein the particle size of the foam diamond filler is 10-40 μm.
7. A method for preparing a centerless grinding wheel for plunge grinding of an elongated shaft part as claimed in any one of claims 1 to 6, which comprises the following steps:
1) taking raw materials of the abrasive layer according to a proportion, and uniformly mixing to obtain a molding material;
2) hot-pressing the molding material obtained in the step 1) to obtain a grinding wheel block blank;
3) hardening the grinding wheel blank obtained in the step 2) according to a designed hardening curve, and obtaining a grinding wheel finished product through a subsequent conventional processing procedure after hardening.
8. The method for preparing the centerless grinding wheel for plunge grinding of the slender shaft part as claimed in claim 7, wherein the hot press molding conditions in the step 2) are as follows: the hot-press forming temperature is 165-205 ℃, the hot-press time is 45-110 min, and the pressure is 5-25 MPa.
9. The method for preparing a centerless grinding wheel for plunge grinding of an elongated shaft part according to claim 7, wherein the hardening conditions in the step 3) are as follows: and (3) placing the grinding wheel blank in a hardening oven, raising the room temperature to 100 ℃ after 2 hours, preserving the heat for 2 hours, raising the temperature to 175-210 ℃ after 2 hours, preserving the heat for 12 hours, naturally cooling to below 30 ℃, and taking out.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113696109A (en) * | 2021-09-15 | 2021-11-26 | 郑州磨料磨具磨削研究所有限公司 | Grinding wheel for grinding insulated bearing and forming method thereof |
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