CN111469063A - CBN grinding wheel special for stainless steel flat grinding and preparation method thereof - Google Patents
CBN grinding wheel special for stainless steel flat grinding and preparation method thereof Download PDFInfo
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- CN111469063A CN111469063A CN202010393745.4A CN202010393745A CN111469063A CN 111469063 A CN111469063 A CN 111469063A CN 202010393745 A CN202010393745 A CN 202010393745A CN 111469063 A CN111469063 A CN 111469063A
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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
- B24D3/04—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 inorganic
- B24D3/06—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 inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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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
- B24D3/34—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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/003—Cubic boron nitrides only
Abstract
The invention provides a CBN grinding wheel special for stainless steel flat grinding and a preparation method thereof, wherein the grinding wheel comprises the following raw materials in percentage by weight: 18-25% of phenolic resin powder, 25-35% of CBN, 12-18% of silicon carbide, 8-12% of white corundum, 20-25% of copper powder and 1-3% of foaming agent. The CBN grinding wheel is specially designed for stainless steel plane grinding and is used for replacing the conventional common corundum grinding wheel. The grinding wheel has uniformly distributed air holes, the designed binding agent has weak elasticity, the sharpness can be continuously kept when the plane of a stainless steel workpiece is ground, the grinding wheel does not need to be trimmed during continuous processing, the production efficiency of the grinding processing is improved, the service life of grinding fluid is prolonged, and the production cost is reduced. The surface of the ground stainless steel workpiece has uniform lines and stable size, and reduces the time for repeatedly dressing the grinding wheel and repeatedly measuring the size of the workpiece when a worker uses a common corundum grinding wheel.
Description
Technical Field
The invention belongs to the technical field of grinding tool processing, and relates to a CBN grinding wheel special for stainless steel flat grinding and a preparation method thereof.
Background
Stainless steel is a general name of steel containing elements such as Cr, Mo, and Ni, which is resistant to chemical corrosion by acid and alkali, and there are more than one hundred types of stainless steels currently on the market, including martensitic steel, ferritic steel, austenitic-ferritic (duplex) stainless steel, and precipitation hardening stainless steel, according to the structure state.
The die is various dies and tools for obtaining required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. With the development of the mold industry, the performance requirements of the mold material on the mold working environment are higher and higher, and the mold is required to have special performances such as corrosion resistance, non-magnetism, high temperature resistance, oxidation resistance, high wear resistance and the like. The stainless steel can meet the requirements of the progressive development of the die material, so that the application of various stainless steels in the die material is increasingly wide. The mold industry requires that the flatness and parallelism of the mold are good, so that a surface grinding machine is mainly adopted to grind the end surface of a workpiece. However, stainless steel workpieces have a high coefficient of thermal expansion, and a slight temperature change causes the workpiece to be oversized, resulting in the grinding wheel cutting the workpiece too much. At present, a common corundum grinding wheel is mainly used for grinding, the feeding amount needs to be reduced during grinding, uniform feed is realized, water is added for cooling, and the finishing interval is very short when the common corundum grinding wheel is used for grinding stainless steel with higher hardness after nitriding or quenching.
Along with the requirements of industrial production on efficiency and cleanness and environmental protection are higher and higher, the common corundum grinding wheel is low in machining efficiency, short in dressing interval and short in service life, the grinding wheel needs to be replaced in about 4-7 days, and grinding fluid needs to be replaced frequently due to the fact that the grinding wheel is worn quickly in the grinding process, and pollution is large. In order to improve the processing efficiency and reduce the production cost, the special CBN grinding wheel for grinding the stainless steel plane has higher economic benefit and value.
Disclosure of Invention
In view of the above situation, the invention provides a CBN grinding wheel special for stainless steel flat grinding and a preparation method thereof, so as to improve the processing quality of stainless steel, improve the production efficiency and reduce the production cost.
The specific technical scheme of the invention is as follows:
the CBN grinding wheel special for the stainless steel flat grinding is prepared from the following raw materials in percentage by weight: 18-25% of resin powder, 12-18% of silicon carbide, 8-12% of white corundum, 20-25% of copper powder, 1-3% of foaming agent and the balance of CBN abrasive.
The preparation method of the CBN grinding wheel special for the stainless steel flat grinding comprises the following steps:
1) adding resin powder, silicon carbide, white corundum, copper powder and a foaming agent into a three-dimensional mixer, and mixing for 1-1.5h to fully and uniformly mix the resin powder, the silicon carbide, the white corundum, the copper powder and the foaming agent; adding CBN abrasive, mixing for 0.5-1h to mix the materials evenly, then manually sieving the materials twice by a 120# sieve, and taking the undersize materials as the powder of the abrasive layer;
2) adding the substrate with the dovetail groove into a mould, and then adding the powder of the abrasive layer obtained in the step 1); and then sequentially carrying out cold pre-pressing, hot pressing and curing to obtain the CBN grinding wheel special for the flat grinding of the stainless steel.
Preferably, the die ring is lifted during cold prepressing to enlarge the volume of the die cavity by 5-10%, the cold pressing pressure is 5-10MPa, then the gasket is not taken to be pressed on a hot press, and the specific operation is a conventional method.
In the invention, the hot pressing pressure is 10MPa, the temperature is 170-180 ℃, and the time is 20-40 min; the curing temperature is 160-170 ℃, the time is 6-10h, and the curing temperature is cooled to room temperature along with the furnace. The CBN grinding wheel special for the stainless steel flat grinding can be obtained by solidification, and the finished grinding wheel can be obtained by carrying out vehicle processing, milling processing and grinding processing according to the size of the finished product.
In the invention, the resin powder is phenolic resin powder; the CBN abrasive is in a micro brittle fracture type, has the granularity of D46-D126 mu m, and is used for semi-finishing and finishing grinding; the granularity of the silicon carbide is D10-D30 mu m; the granularity of the white corundum is D30-D64 mu m; the granularity of the copper powder is D15-D40 mu m; the foaming agent is a polymer microsphere, the particle size of the foaming agent is 10-30 microns, the foaming agent contains a liquid hydrocarbon expanding agent, the foaming agent expands into a core-shell structure after being heated, the internal gas pressure and the external pressure are kept balanced, the pressure resistance is over 30MPa, the foaming agent has better mechanical strength, and pores formed by the foaming agent are uniformly distributed on the pressed grinding material layer, so that the grinding material layer can contain abrasive dust and has micro-elasticity.
The invention has the beneficial effects that: the grinding wheel provided by the invention contains air holes capable of bearing pressure, the air holes are uniformly distributed in the grinding material layer, the grinding material layer has certain elasticity, the used CBN grinding material is a micro-brittle fracture type grinding material and is used for grinding stainless steel workpieces, and when stainless steel is ground by semi-finishing and finish-finishing, the grains on the surface of the ground stainless steel are fine and uniform without scratches. Need not to maintain in the emery wheel use, automatic broken big pore of coming out behind the abrasive material layer surface atress has better holding effect to the grinding bits, and the abrasive material is mutually supported with the binder simultaneously, and the at utmost performance emery wheel is sharp nature certainly, can be used to replace the ordinary corundum emery wheel of existing usefulness, very big improvement production efficiency, reduction in production cost.
Drawings
FIG. 1 is a photograph of an aluminum substrate with a dovetail groove;
FIG. 2 is a photograph showing the appearance of a grinding wheel according to one embodiment.
Detailed Description
The preparation method of the CBN grinding wheel special for the stainless steel flat grinding comprises the following steps:
1) adding resin powder, silicon carbide, white corundum, copper powder and a foaming agent into a three-dimensional mixer, and mixing for 1-1.5h to fully and uniformly mix the resin powder, the silicon carbide, the white corundum, the copper powder and the foaming agent; adding CBN abrasive, mixing for 0.5-1h to mix the materials evenly, then manually sieving the materials twice by a 120# sieve, and taking the undersize materials as the powder of the abrasive layer;
2) adding the substrate with the dovetail groove into a mould, and then adding the powder of the abrasive layer obtained in the step 1); and then sequentially carrying out cold pre-pressing, hot pressing and curing to obtain the CBN grinding wheel special for the flat grinding of the stainless steel.
The raw materials by weight percentage are as follows: 18-25% of resin powder, 12-18% of silicon carbide, 8-12% of white corundum, 20-25% of copper powder, 1-3% of foaming agent and the balance of CBN abrasive.
In the invention, the resin powder is phenolic resin powder; the CBN abrasive is in a micro brittle fracture type, has the granularity of D46-D126 mu m, and is used for semi-finishing and finishing grinding; the granularity of the silicon carbide is D10-D30 mu m; the granularity of the white corundum is D30-D64 mu m; the granularity of the copper powder is D15-D40 mu m; the foaming agent is a microsphere foaming agent, the particle size of the polymer microsphere is 10-30 microns, the polymer microsphere contains a liquid hydrocarbon expanding agent, the polymer microsphere expands into a core-shell structure after being heated, the internal gas pressure and the external pressure are kept balanced, the pressure resistance is over 30MPa, the mechanical strength is good, and pores formed by the foaming agent are uniformly distributed on the pressed abrasive material layer, so that the abrasive material layer can contain abrasive dust and has micro-elasticity.
The present invention will be further described with reference to specific examples; all the raw materials are commercial products, such as phenolic resin powder from Hengtong chemical industry, a foaming agent is a commercial Korean DONGJIN high-temperature type PVC microsphere expanding agent, one of MS-197D, MS-205D, MS-215C, and the specific preparation operation method is a conventional technology; the specification and the size of the prepared grinding wheel are as follows: 1a1180D × 20T 31.75H × 10W × 20T.
Example 1
A CBN grinding wheel special for flat grinding of stainless steel comprises the following raw materials and components:
| components | Phenolic resin powder | CBN | Silicon carbide | Copper powder | White corundum | Foaming agent |
| Matchingwt% | 22 | 30 | 15 | 20 | 10 | 3 |
Wherein the granularity of CBN is 76 microns, the granularity of foaming agent is 20 microns, the granularity of white corundum is 30 microns, the granularity of silicon carbide is 20 microns, and the granularity of copper powder is 30 microns.
The specific pressing process is as follows:
mixing the phenolic resin powder, the silicon carbide powder, the copper powder, the white corundum powder and the foaming agent in the proportion, and then putting the mixture into a three-dimensional mixer for mixing for 1 hour to fully and uniformly mix the mixture; adding a CBN grinding material into the mixed mixture, placing the mixture in a three-dimensional mixer, mixing for 1 hour, sieving twice by using a No. 120 sieve to fully mix the mixture uniformly, and taking undersize materials as grinding material layer powder;
putting a conventional dovetail groove-forming aluminum substrate (a conventional substrate, see figure 1, a dovetail groove is a groove with a large inner part and a small outer part) into a conventional die, putting uniformly mixed powder of an abrasive material layer into a die cavity, putting the die on a cold press for 5MPa pressure prepressing, increasing the die cavity volume by 10% by die ring height during prepressing, and pressing on the hot press without taking a gasket, wherein the pressing process comprises the following steps: hot pressing at 170 deg.C under 10MPa for 30 min; and (4) after the hot pressing is finished, demolding, taking out the grinding wheel, carrying out subsequent curing treatment on the grinding wheel, keeping the temperature for 10 hours at the curing temperature of 160 ℃, and then cooling to room temperature along with the furnace.
And after the grinding wheel is solidified, carrying out machining, milling and grinding according to the size of a finished product. The finished grinding wheel is obtained, and the attached figure 2 is an electron microscope photo thereof, so that the pores can be seen to be distributed uniformly and have small size difference.
Example 2
A CBN grinding wheel special for flat grinding of stainless steel comprises the following raw materials and components:
| components | Phenolic resin powder | CBN | Silicon carbide | Copper powder | White corundum | Foaming agent |
| Matchingwt% | 24 | 30 | 15 | 20 | 10 | 1 |
Wherein the granularity of CBN is 76 microns, the granularity of foaming agent is 20 microns, the granularity of white corundum is 30 microns, the granularity of silicon carbide is 20 microns, and the granularity of copper powder is 30 microns.
The specific pressing process was the same as in example 1 except that the die ring was raised during pre-pressing to enlarge the volume of the die cavity by 5% to obtain the finished grinding wheel.
Comparative example 1
| Components | Phenolic resin powder | CBN | Silicon carbide | Copper powder | White corundum |
| Matchingwt% | 25 | 30 | 15 | 20 | 10 |
The CBN particle size is 76 microns, the white corundum particle size is 30 microns, the silicon carbide particle size is 20 microns, and the copper powder particle size is 30 microns, and the specific pressing process is as follows:
the specific pressing process was the same as in example 1 except that the die ring was raised during pre-pressing to enlarge the volume of the die cavity by 5% to obtain the finished grinding wheel.
Comparative example 2
The common corundum grinding wheel which has the same specification, size and granularity and is used for flat grinding of stainless steel in the prior art.
Performance results
The machining conditions and requirements in the examples are shown in table 1, and the machining results of the four grinding wheels are shown in table 2.
TABLE 1 processing conditions and requirements
| Material of workpiece | Stainless steel 316L |
| Size of workpiece | 100 x 30 x 5, balance 0.1mm |
| Rotational speed of grinding wheel | 3600rpm is adjustable |
| Dressing mode | Red copper and diamond pen |
| Amount of feed | 4mm/min |
| Cooling method | Water +4.5wt% emulsion |
| Accuracy of measurement | (flatness, parallelism, etc.): less than or equal to 0.01mm |
| Smooth finish | Ra0.2-0.3µm |
TABLE 2 processing results
| Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | |
| Amount of single feed | 0.01mm | 0.01mm | 0.01mm | 0.01mm |
| Smooth finish | Ra0.2～0.23 | Ra0.21～0.23 | Ra0.25～0.28 | Ra0.24～0.27 |
| Mean value of grinding power | 184.98W | 198.37W | 233.31W | 211.26W |
| Dressing interval | 2200 | 1000 | 200 | 300 |
| Dressing mode | Red copper | Red copper | Red copper | Diamond pen |
Note: and (5) finishing when the workpiece is unstable in size or has over-poor precision. The grinding power is measured by an MPD grinding test system, and the average value represents the sharpness of the grinding wheel, and the lower the average value, the higher the sharpness.
The CBN of the embodiment 1 is replaced by the diamond with the same granularity or the white corundum is replaced by the diamond with the same granularity, the rest is unchanged, the same processing technology is adopted, the obtained grinding wheel is not suitable for flat grinding of stainless steel, the grinding wheel is quick in loss, the fineness can not reach the Ra0.2-0.3 mu m requirement, and the fineness can not reach the Ra0.2-0.3 mu m requirement no matter how the processing parameters are adjusted. The foaming agent in the embodiment 1 is replaced by hollow glass beads with the particle size of 65 microns, the rest are unchanged, the same processing technology is adopted, the phenomenon that the foaming agent is not suitable for flat grinding of stainless steel is found, sticky scraps on the surface of a grinding wheel are blackened, a workpiece has an extrusion trace, the smoothness can not reach the Ra0.2-0.3 mu m requirement, and the smoothness can not reach the Ra0.2-0.3 mu m requirement no matter how the processing parameters are adjusted. The same processing procedure was carried out by replacing the copper powder of example 1 with the silver powder of the same particle size, and it was found that the average grinding power was 186.35W and the dressing interval was 2100. CN102837266A table 2 the wheel prepared in example 2, using the same machining process, was found to have an average grinding power of 296.95W, which is a ceramic double-ended grinding, and the grinding wheel power value produced by this formulation was much higher.
As shown in table 2 above, both of examples 1 and 2 meet the use requirements, wherein the size and accuracy of example 1 are more stable. The power consumption of the conventional resin grinding wheel in the comparative example 1 is gradually increased when the stainless steel is processed, the blockage of sticky chips on the surface of the grinding material layer is mainly shown, and compared with the conventional corundum grinding wheel used in the prior art, the resin grinding wheel in the examples 1 and 2 can improve the efficiency and effectively reduce the dressing interval.
Claims (10)
1. The CBN grinding wheel special for the stainless steel flat grinding is characterized by being prepared from resin powder, silicon carbide, white corundum, copper powder, a foaming agent and a CBN grinding material.
2. The CBN grinding wheel special for the flat grinding of the stainless steel as claimed in claim 1, wherein the raw materials comprise, by weight, 18-25% of resin powder, 12-18% of silicon carbide, 8-12% of white corundum, 20-25% of copper powder, 1-3% of foaming agent and the balance CBN abrasive.
3. The CBN grinding wheel special for the stainless steel flat grinding of claim 1, wherein the preparation method of the CBN grinding wheel special for the stainless steel flat grinding comprises the following steps:
1) adding resin powder, silicon carbide, white corundum, copper powder and a foaming agent into a three-dimensional mixer, mixing, adding a CBN grinding material, mixing, and sieving to obtain undersize material as grinding material layer powder;
2) adding the substrate with the dovetail groove into a mould, and then adding the powder of the abrasive layer obtained in the step 1); and then sequentially carrying out cold pre-pressing, hot pressing and curing to obtain the CBN grinding wheel special for the flat grinding of the stainless steel.
4. The CBN grinding wheel special for the flat grinding of the stainless steel as claimed in claim 3, wherein the pressure of the cold pre-pressing is 5-10 MPa; the hot pressing pressure is 10MPa, the temperature is 170-180 ℃, and the time is 20-40 min; the curing temperature is 160-170 ℃, and the curing time is 6-10 h.
5. The CBN grinding wheel special for the stainless steel flat grinding as claimed in claim 3, wherein the sieve is a 120# sieve.
6. The CBN grinding wheel special for the stainless steel flat grinding of claim 1, wherein the resin powder is phenolic resin powder; the granularity of the CBN abrasive is D46-D126 mu m; the granularity of the silicon carbide is D10-D30 mu m; the granularity of the white corundum is D30-D64 mu m; the granularity of the copper powder is D15-D40 mu m; the particle size of the foaming agent is 10-30 mu m.
7. The CBN grinding wheel special for stainless steel flat grinding as claimed in claim 1, wherein the foaming agent is a microsphere foaming agent.
8. The use of the CBN grinding wheel special for flat grinding of stainless steel of claim 1 in the processing of stainless steel.
9. A method of machining a workpiece, comprising the steps of:
1) adding resin powder, silicon carbide, white corundum, copper powder and a foaming agent into a three-dimensional mixer, mixing, adding a CBN grinding material, mixing, and sieving to obtain undersize material as grinding material layer powder;
2) adding the substrate with the dovetail groove into a mould, and then adding the powder of the abrasive layer obtained in the step 1); then sequentially carrying out cold pre-pressing, hot pressing and curing to obtain a CBN grinding wheel special for flat grinding of stainless steel;
3) processing the workpiece by using the CBN grinding wheel special for flat grinding of stainless steel in the step 2).
10. The method of machining a stainless steel workpiece according to claim 9, wherein the workpiece is a stainless steel workpiece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010393745.4A CN111469063A (en) | 2020-05-11 | 2020-05-11 | CBN grinding wheel special for stainless steel flat grinding and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112140014A (en) * | 2020-10-15 | 2020-12-29 | 江苏赛扬精工科技有限责任公司 | Resin centerless grinding CBN grinding wheel for electrochemical auxiliary machining and preparation method thereof |
| CN112296892A (en) * | 2020-10-26 | 2021-02-02 | 江苏赛扬精工科技有限责任公司 | Resin superhard grinding wheel for processing tough metal material and preparation method thereof |
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| JP2010115768A (en) * | 2008-10-16 | 2010-05-27 | Jtekt Corp | Cbn grinding wheel |
| CN103537998A (en) * | 2013-11-08 | 2014-01-29 | 谢泽 | Preparation method of grinding wheel regarding grinding material as basis and containing foaming agent |
| CN106002666A (en) * | 2016-07-05 | 2016-10-12 | 廊坊菊龙五金磨具有限公司 | Multifunctional resin grinding wheel and production method thereof |
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| CN112140014A (en) * | 2020-10-15 | 2020-12-29 | 江苏赛扬精工科技有限责任公司 | Resin centerless grinding CBN grinding wheel for electrochemical auxiliary machining and preparation method thereof |
| CN112296892A (en) * | 2020-10-26 | 2021-02-02 | 江苏赛扬精工科技有限责任公司 | Resin superhard grinding wheel for processing tough metal material and preparation method thereof |
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