CN114905339A - Processing technology of high-precision hard alloy bar - Google Patents
Processing technology of high-precision hard alloy bar Download PDFInfo
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- CN114905339A CN114905339A CN202210472892.XA CN202210472892A CN114905339A CN 114905339 A CN114905339 A CN 114905339A CN 202210472892 A CN202210472892 A CN 202210472892A CN 114905339 A CN114905339 A CN 114905339A
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- 239000000956 alloy Substances 0.000 title claims abstract description 63
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 63
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 193
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- -1 hydroxide ions Chemical class 0.000 claims description 18
- 238000003754 machining Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 239000004576 sand Substances 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 229920006122 polyamide resin Polymers 0.000 description 14
- QDCPNGVVOWVKJG-VAWYXSNFSA-N 2-[(e)-dodec-1-enyl]butanedioic acid Chemical compound CCCCCCCCCC\C=C\C(C(O)=O)CC(O)=O QDCPNGVVOWVKJG-VAWYXSNFSA-N 0.000 description 7
- 229910052582 BN Inorganic materials 0.000 description 7
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 7
- 229910000420 cerium oxide Inorganic materials 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 229910003460 diamond Inorganic materials 0.000 description 7
- 239000010432 diamond Substances 0.000 description 7
- 150000002148 esters Chemical class 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- 238000003825 pressing Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000005488 sandblasting Methods 0.000 description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 7
- 229910010271 silicon carbide Inorganic materials 0.000 description 7
- 239000011684 sodium molybdate Substances 0.000 description 7
- 235000015393 sodium molybdate Nutrition 0.000 description 7
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The invention discloses a processing technology of a high-precision hard alloy bar, which relates to the technical field of hard alloy processing, and is characterized in that a centerless grinder is adopted to grind an original hard alloy bar for at least 3 times, namely a first grinding, a second grinding and a third grinding, the centerless grinder comprises a guide wheel and a grinding wheel which rotate synchronously in an out-of-phase mode, grinding fluid is adopted to cool during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled. The invention adopts the centerless grinder to grind the bar for multiple times, gradually releases the processing stress in the bar, controls the grinding amount of the bar by different grinding processes, and reduces the defect of annular thread lines on the surface of the bar caused by grinding sand grains or cut materials by combining a grinding fluid filtering system, thereby preparing the high-precision hard alloy bar.
Description
Technical Field
The invention relates to the field of hard alloy processing, in particular to a processing technology of a high-precision hard alloy bar.
Background
Due to the material characteristics of the hard alloy, the hard alloy bar is mainly machined by centerless grinding at the present stage. The centerless grinding is to smoothly feed a workpiece fed by an electromagnetic feeding device to a space between a grinding wheel and a guide wheel through an automatic feeding device to finish the cylindrical grinding of mechanical processing. Because the automatic feeding device has high automation degree, the work safety is convenient to ensure, and the operation is stable.
In the aspect of high accuracy accurate grinding rod product, current machining ability and processing level still can not satisfy precision and the productivity requirement in current consumer electronics processing field, present majority accurate grinding rod product is 5um at the runout control accuracy, and the runout control accuracy that the trade required high accuracy accurate grinding rod product is 2um, current machining level has very big difference for trade required precision, consequently, the production technology of the high accuracy accurate grinding rod product of urgent need research and development, promote high accuracy accurate grinding rod production process level, the high accuracy rod product that satisfies the precision and the productivity requirement in consumer electronics processing field is produced in batches.
In the centerless grinding process, due to the material characteristics of the hard alloy, the end face of the thin rod is easy to be impacted by a moving grinding wheel to break corners or generate micro cracks when the thin rod is processed, so that the rejection rate of products is high, and the production cost is increased. In the process of fine grinding, the allowance of one-time grinding is too large or the grinding wheel is too coarse, so that extremely fine thread lines are generated on the surface of the part. The inclination angle of the guide wheel is too large, so that the feed amount of the part is too fast, and the surface smoothness of the part is not enough. The front guide plate and the rear guide plate are uniformly inclined to one side of the grinding wheel, so that the middle of the part is large, and the two ends of the part are small. Controlling device parameters is critical to the preparation of the lapping rod.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art and provides a processing technology of a high-precision hard alloy bar.
The technical solution of the invention is as follows:
a machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for at least 3 times by a centerless grinder, wherein the centerless grinder comprises a first grinding, a second grinding and a third grinding, the centerless grinder comprises a guide wheel and a grinding wheel which rotate synchronously in an out-of-phase mode, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
As a preferable scheme of the invention, in the first grinding, the feed amount is 0.04-0.06mm, the horizontal angle of the guide wheel is 1-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of the grinding wheel is 80-120 meshes, and the rotating speed of the guide wheel is 80-100 rpm.
As a preferable scheme of the invention, in the second grinding, the feed amount is 0.02-0.03mm, the horizontal angle of the guide wheel is 2-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of the grinding wheel is 200-400 meshes, and the rotating speed of the guide wheel is 80-100 rpm.
As a preferable scheme of the invention, in the third grinding, the feed amount is 0.007-0.009mm, the horizontal angle of the guide wheel is 1-2 degrees, the vertical angle of the guide wheel is 1-3 degrees, the mesh number of the grinding wheel is 600 meshes and 900 meshes, and the rotating speed of the guide wheel is 70-80 rpm.
As a preferable scheme of the invention, the radial run-out of the raw hard alloy bar stock is controlled to be 0.008-0.010 mm.
As a preferable scheme of the invention, the feeding taper of the original hard alloy bar stock is controlled to be 0.008-0.010 mm.
In a preferable scheme of the invention, the feed roundness of the original hard alloy bar stock is 0.003-0.007 mm.
As a preferable scheme of the invention, the preservation environment temperature of the original hard alloy bar stock is 22 +/-2 ℃.
In a preferred embodiment of the present invention, the guide wheel and/or the grinding wheel contains aluminum powder, and the grinding fluid contains hydroxide ions.
The invention has the beneficial effects that: the method adopts the centerless grinder to grind the bar for multiple times, gradually releases the processing stress in the bar, controls the grinding amount of the bar through different grinding processes, controls the storage temperature of the original bar, and reduces the processing influence caused by expansion with heat and contraction with cold of the bar; and the grinding fluid filtering system is combined, so that the defect that the surface of the bar has an annular thread line due to the ground sand grains or cut materials is reduced, and the high-precision hard alloy bar is prepared. And moreover, the grinding wheel and/or the guide wheel contain aluminum powder, the aluminum powder reacts with hydroxyl ions in the grinding fluid to generate gas, and the gas is discharged to generate micro-pores in the grinding wheel and the guide wheel, so that scraps and the grinding fluid can be favorably attached, and the chips are prevented from being stuck on the surface of the grinding wheel to damage the bar stock.
Detailed Description
The following examples further illustrate the technical solution of the present invention.
The raw cemented carbide bar stock described in the examples below was stored at an ambient temperature of 22 ± 2 ℃.
Example 1
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.04mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 100 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the second grinding, the feed amount is 0.02mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 300 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5 degrees, the vertical angle of the guide wheel is 2 degrees, the mesh number of the grinding wheel is 800 meshes, and the rotating speed of the guide wheel is 75 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feeding roundness of the original hard alloy bar stock is 0.005 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Example 2
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 100 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the second grinding, the feed amount is 0.025mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 300 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.007mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 800 meshes, and the rotating speed of the guide wheel is 75 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feed roundness of the original hard alloy bar stock is 0.005 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Example 3
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.06mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 100 degrees, and the rotating speed of the guide wheel is 90 rpm.
In the second grinding, the feed amount is 0.03mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 3 degrees, the mesh number of the grinding wheel is 300 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5 degrees, the vertical angle of the guide wheel is 2 degrees, the mesh number of the grinding wheel is 800 meshes, and the rotating speed of the guide wheel is 80 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feed roundness of the original hard alloy bar stock is 0.005 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Example 4
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 100 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the second grinding, the feed amount is 0.03mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 400 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.009mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2 degrees, the mesh number of the grinding wheel is 900 meshes, and the rotating speed of the guide wheel is 75 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.009 mm.
The feeding roundness of the original hard alloy bar is 0.006 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Example 5
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 3 degrees, the mesh number of the grinding wheel is 100 meshes, and the rotating speed of the guide wheel is 100 rpm.
In the second grinding, the feed amount is 0.02mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 400 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2 degrees, the mesh number of the grinding wheel is 900 meshes, and the rotating speed of the guide wheel is 80 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feeding roundness of the original hard alloy bar stock is 0.007 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Comparative example 1 (one pass processing)
A machining process of a high-precision hard alloy bar adopts a centerless grinding machine to grind an original hard alloy bar, wherein the feed amount is 0.02mm, the horizontal angle of a guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of grinding wheels is 300 meshes, the rotating speed of the guide wheel is 90rpm, the centerless grinding machine comprises the guide wheel and the grinding wheels which rotate synchronously in an out-of-phase mode, grinding liquid is used for cooling during grinding, and the grinding liquid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feed roundness of the original hard alloy bar stock is 0.005 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide and 25 parts of aluminum powder.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
Comparative example 2 (without aluminum powder)
A machining process of a high-precision hard alloy bar material comprises the steps of grinding an original hard alloy bar material for 3 times by a centerless grinder, wherein the grinding is performed for the first time, the second time and the third time respectively, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is adopted for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
The diameter of an original bar stock is 5mm, and the rest of supplied materials is 0.06 mm.
In the first grinding, the feed amount is 0.04mm, the horizontal angle of the guide wheel is 2 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 100 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the second grinding, the feed amount is 0.02mm, the horizontal angle of the guide wheel is 2.5 degrees, the vertical angle of the guide wheel is 2.5 degrees, the mesh number of the grinding wheel is 300 meshes, and the rotating speed of the guide wheel is 90 rpm.
In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5 degrees, the vertical angle of the guide wheel is 2 degrees, the mesh number of the grinding wheel is 800 meshes, and the rotating speed of the guide wheel is 75 rpm.
The radial runout of the raw hard alloy bar stock is controlled at 0.008 mm.
The feeding taper of the original hard alloy bar stock is controlled to be 0.008 mm.
The feed roundness of the original hard alloy bar stock is 0.005 mm.
The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;
the wear-resistant surface is prepared by the following steps of mixing, pressing, flat grinding, sand blasting, bonding, curing and finishing the raw materials in parts by weight: 30 parts of polyamide resin, 40 parts of polyamide resin, 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene and 35 parts of cerium oxide.
The grinding fluid comprises the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate and 40 parts of deionized water.
The radial runout detector is adopted to carry out the performance detection of radial runout on the embodiment and the comparative example, and the detection results are shown in the following table. (radial run out is used to detect shaft misalignment, the check shaft being the roundness of a point and the misalignment of that point on the shaft relative to a datum.)
According to the table, the radial run-out of the embodiment is smaller than that of the comparative example, the possible reasons are as follows, and analysis of the comparative example shows that through multiple grinding processes, the processing stress in the bar is gradually released, meanwhile, through different grinding processes, the grinding amount of the bar is controlled, and a grinding fluid filtering system is combined, so that the defect that the surface of the bar is provided with an annular thread line due to grinding sand grains or cutting materials is reduced, and the high-precision hard alloy bar is manufactured. The analysis of the comparative example 2 shows that the wear-resistant surfaces of the grinding wheel and the guide wheel contain aluminum powder which reacts with hydroxyl ions in the grinding fluid to generate gas, and the gas is discharged to generate micro-pores in the grinding wheel and/or the guide wheel, so that the adhesion of chips and the grinding fluid is facilitated, the chips are prevented from being stuck on the surface of the grinding wheel to damage the bar, the surface defect of the bar is reduced, and the precision of the bar is improved.
The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.
The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by substantially the same means are within the protection scope of the present invention.
Claims (9)
1. The machining process of the high-precision hard alloy bar is characterized in that a centerless grinder is used for grinding an original hard alloy bar at least 3 times, namely a first grinding, a second grinding and a third grinding, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is used for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.
2. A processing technology of a high-precision hard alloy bar according to claim 1, wherein in the first grinding, the feed amount is 0.04-0.06mm, the horizontal angle of a guide wheel is 1-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of grinding wheels is 80-120 meshes, and the rotating speed of the guide wheel is 80-100 rpm.
3. The processing technology of the high-precision hard alloy bar as claimed in claim 1, wherein in the second grinding, the feed amount is 0.02-0.03mm, the horizontal angle of the guide wheel is 2-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of the grinding wheel is 200-400 meshes, and the rotating speed of the guide wheel is 80-100 rpm.
4. The processing technology of the high-precision hard alloy bar as claimed in claim 1, wherein in the third grinding, the feed amount is 0.007-0.009mm, the horizontal angle of the guide wheel is 1-2 degrees, the vertical angle of the guide wheel is 1-3 degrees, the number of grinding wheels is 600-900 meshes, and the rotating speed of the guide wheel is 70-80 rpm.
5. A process of manufacturing a high precision cemented carbide rod according to claim 1, wherein the radial run out of the raw cemented carbide rod feed is controlled at 0.008-0.010 mm.
6. A high precision cemented carbide rod as claimed in claim 1, wherein the feed taper of the raw cemented carbide rod is controlled to 0.008-0.010 mm.
7. A high precision hard alloy bar processing technology as claimed in claim 1, wherein the feed roundness of the original hard alloy bar is 0.003-0.007 mm.
8. A process for manufacturing a high precision cemented carbide rod according to claim 1, wherein the original cemented carbide rod is kept at an ambient temperature of 22 ± 2 ℃.
9. A high-precision hard alloy bar material processing technology as claimed in claim 1, wherein the guide wheel and/or the grinding wheel contains aluminum powder, and the grinding fluid contains hydroxide ions.
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