CN115464342A - Manufacturing method of long-service-life grinding disc center cover for coal mill - Google Patents
Manufacturing method of long-service-life grinding disc center cover for coal mill Download PDFInfo
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- CN115464342A CN115464342A CN202211171649.0A CN202211171649A CN115464342A CN 115464342 A CN115464342 A CN 115464342A CN 202211171649 A CN202211171649 A CN 202211171649A CN 115464342 A CN115464342 A CN 115464342A
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- disc center
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- 238000000227 grinding Methods 0.000 title claims abstract description 51
- 239000003245 coal Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910000617 Mangalloy Inorganic materials 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 238000010114 lost-foam casting Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 6
- 238000003618 dip coating Methods 0.000 claims description 6
- 244000035744 Hura crepitans Species 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010892 electric spark Methods 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 239000010437 gem Substances 0.000 claims description 3
- 229910001751 gemstone Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 241000221696 Sclerotinia sclerotiorum Species 0.000 claims 2
- 238000005498 polishing Methods 0.000 abstract description 2
- 235000002245 Penicillium camembertii Nutrition 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention relates to the technical field of coal mills, in particular to a method for manufacturing a long-service-life grinding disc center cover for a coal mill, which comprises the following steps: s1, casting; s2, polishing; s3, surfacing; s4, processing; s5, mounting a pre-hardened high manganese steel ball head; the invention provides the manufacturing method of the grinding disc center cover with long service life for the coal mill, which has simple process and greatly improves the strength and the rigidity of the manufactured grinding disc center cover so as to have long service life.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a method for manufacturing a long-service-life grinding disc center cover for a coal mill.
Background
The coal mill is a machine for crushing and grinding coal blocks into coal powder, is an important auxiliary device of a coal powder furnace, and has the working principle as follows: the coal blocks enter the coal mill from the coal dropping port, fall on the rotary millstone, and are gradually diffused to the edge of the millstone under the action of centrifugal force, and when the coal blocks are diffused to the edge of the millstone, the grinding rollers on the edge of the millstone grind the coal blocks to grind the coal blocks into coal powder. In the actual use process, in order to prevent the coal blocks from forming the stacking material in the center of the grinding disc, the center cover in the center of the grinding disc is arranged in a conical structure in the prior art, so that the coal blocks are guided to the edge of the grinding disc, and the coal blocks are prevented from being stacked in the center of the grinding disc.
However, the strength and rigidity of the existing grinding disc center cover are limited, deformation can occur under the long-term impact of coal blocks, and breakage can occur under the serious condition, so that the service life of the grinding disc center cover is greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides the method for manufacturing the long-service-life grinding disc center cover for the coal mill, which is simple in process, and the strength and the rigidity of the manufactured grinding disc center cover are greatly improved, so that the service life is long.
The technical scheme for realizing the purpose of the invention is as follows: a manufacturing method of a long-life grinding disc center cover for a coal mill comprises the following steps:
s1, casting: casting a base body of the grinding disc center cover, wherein the base body comprises a hoisting platform at the top center and a mounting platform at the bottom edge, and simultaneously casting a plurality of reinforcing ribs on the inner surface of the base body;
s2, polishing: the outer surface of the middle part of the matrix, the side wall of the hoisting platform and the top surface of the mounting platform are processed through shot blasting to expose the metal luster;
s3, surfacing: surfacing a plurality of mutually connected reinforcing rings on the outer surface of the middle part of the base body, the side wall of the hoisting platform and the top surface of the mounting platform to form a reinforcing layer;
s4, processing: processing the top surface of the hoisting platform and the bottom surface of the mounting platform, processing a threaded hole in the middle of the hoisting platform, and processing a plurality of countersunk holes on the mounting platform by electric spark;
s5, mounting the pre-hardened high manganese steel ball head.
Further, the matrix comprises the following components in percentage by mass: c: less than or equal to 0.30 percent, mn: less than or equal to 1.20 percent, P: less than or equal to 0.04%, S: less than or equal to 0.04%, si: less than or equal to 0.50 percent.
Further, the substrate adopts a lost foam casting process, and the steps are as follows: manufacturing a lost foam model, brushing paint on the model, drying, boxing a sand box, casting under negative pressure and annealing.
Further, in the lost foam casting, the white mold is produced by adopting mold foaming molding or cutting equipment, and the white mold is made of EPS.
Further, the surface of the model is coated with the model brushing paint in a dip-coating mode, and the dip-coating is carried out for 3 times.
Further, the lost foam model is placed in a drying chamber for drying, the indoor humidity is lower than 30%, the drying temperature is not higher than 50 ℃, and the thickness of the dried coating is not lower than 1.5mm.
Further, the sand mold adopts silica sand or jewel sand.
Further, the temperature of the cast iron water poured by the lost foam is 1600 ℃.
Further, the annealing treatment comprises the following specific steps: heating to 750 ℃ within 4 hours, keeping the temperature for 4 hours at the constant temperature of 700 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging.
Furthermore, the thickness of the reinforcing layer is 12mm, and the HRC is more than or equal to 65.
After the technical scheme is adopted, the invention has the following positive effects:
(1) According to the invention, the base body of the grinding disc center cover is cast by the lost foam casting process, the reinforcing layers are built on the outer surface of the middle part of the base body, the side wall of the hoisting platform and the top surface of the mounting platform in a build-up welding manner, and a plurality of reinforcing ribs are cast on the inner surface of the base body, so that the strength and the rigidity of the grinding disc center cover are greatly improved, and the grinding disc center cover has wear resistance, thereby prolonging the service life of the grinding disc center cover;
(2) According to the invention, the high manganese steel ball head is arranged, so that the grinding disc center cover is easier to fix and hoist, and the grinding disc center cover is more convenient to mount and dismount.
Drawings
In order that the present disclosure may be more readily and clearly understood, the following detailed description of the present disclosure is provided in connection with specific embodiments thereof and with the accompanying drawings, in which:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a top view of a center cover of a grinding disc made in accordance with the present invention;
FIG. 3 is a bottom view of a center cover of the abrasive disc made in accordance with the present invention;
FIG. 4 is a partial cross-sectional view of a center cover of a grinding disc made in accordance with the present invention;
fig. 5 is a schematic structural view of a medium-high manganese steel ball head of the grinding disc center cover manufactured by the invention.
In the figure: 1. a substrate; 2. hoisting the platform; 2a, a threaded hole; 3. mounting a platform; 3a, a counter sink; 4. reinforcing ribs; 5. a reinforcing layer; 6. high manganese steel ball head.
Detailed Description
Example 1
As shown in fig. 1-5, a method for manufacturing a long-life grinding disc center cover for a coal mill comprises the following steps:
s1, casting: casting a base body 1 of a central cover of the grinding disc, wherein the base body 1 comprises a hoisting platform 2 at the top center and a mounting platform 3 at the bottom edge, and simultaneously casting a plurality of reinforcing ribs 4 on the inner surface of the base body 1;
s2, grinding: the outer surface of the middle part of the matrix 1, the side wall of the hoisting platform 2 and the top surface of the mounting platform 3 are processed by shot blasting to expose metallic luster;
s3, surfacing: surfacing welding a plurality of mutually connected reinforcing rings on the outer surface of the middle part of the base body 1, the side wall of the hoisting platform 2 and the top surface of the mounting platform 3 to form a reinforcing layer 5;
s4, processing: processing the top surface of the hoisting platform 2 and the bottom surface of the mounting platform 3, processing a threaded hole 2a in the middle of the hoisting platform 2, and processing a plurality of countersunk holes 3a on the mounting platform 3 by electric spark;
and S5, mounting a pre-hardened high manganese steel ball head 6.
The grinding disc center cover is cast through the lost foam casting process, the base body 1 of the grinding disc center cover is cast, the reinforcing layers are formed on the outer surface of the middle of the base body 1, the side wall of the hoisting platform 2 and the top surface of the mounting platform 3 in a surfacing mode, meanwhile, the reinforcing ribs 4 are cast on the inner surface of the base body 1, the strength and the rigidity of the grinding disc center cover are greatly improved, meanwhile, the grinding disc center cover has wear resistance, and therefore the service life of the grinding disc center cover is prolonged.
Specifically, the base body 1 is of a conical structure, the conical angle alpha of the base body 1 is 120 degrees, the thickness of the reinforcing layer 5 is 12mm, HRC is larger than or equal to 65, after a casting of the base body 1 is cast, machining allowance with the thickness of 8-10mm is reserved on the top surface of the hoisting platform 2 and the bottom surface of the mounting platform 3 for machining, the high manganese steel ball head 6 is in threaded connection with a threaded hole 2a in the middle of the hoisting platform 2, the grinding disc center cover is fixed and hoisted more easily through the arrangement of the high manganese steel ball head 6, and therefore the grinding disc center cover is mounted and dismounted more conveniently. It should be noted that the taper angle α of the base 1 of the millstone center cap of the present invention is not limited to 120 ° in the present embodiment, and can be adjusted according to actual conditions, so as to be applied to an MPS medium speed coal mill or an HP bowl coal mill.
The matrix 1 comprises the following components in percentage by mass: c: less than or equal to 0.30%, mn: less than or equal to 1.20%, P: less than or equal to 0.04%, S: less than or equal to 0.04 percent, si: less than or equal to 0.50 percent. Specifically, the material of the substrate 1 is ZG 230-450.
The method comprises the following steps of (1) adopting a lost foam casting process for the substrate 1: manufacturing a lost foam model, brushing paint on the model, drying, boxing a sand box, casting under negative pressure and annealing. The base body 1 of the grinding disc center cover is cast by the lost foam casting process, the design is flexible, the investment and production cost are low, the casting precision is high, and the clean production is realized.
The production of the white mold in the lost foam casting adopts mold foaming molding or cutting equipment processing molding, the size of the center cover of each set of grinding disc is ensured to be consistent, the white mold is made of EPS, each size of the white mold is amplified by 2 percent to be reserved for shrinkage, and the size of a casting is ensured to meet the processing requirement of a drawing.
The surface of the model is coated with the model brush coating in a dip-coating mode, and the dip-coating is carried out for 3 times. Before painting the model, drying treatment is carried out to remove surface moisture. After dip coating, the coating should be guaranteed to be free of starved coating, running or inclusion of air bubbles.
And (3) drying the lost foam model in a drying chamber, wherein the indoor humidity is lower than 30%, the drying temperature is not higher than 50 ℃, and the thickness of the dried coating is not less than 1.5mm. After the coating is dried, the coating is ensured to be uniform and dry without cracking, corresponding inspection is carried out on the model, coating loss and crack repair are carried out (the repaired model needs to be dried), and the model after the coating is dried is placed in a drying chamber for standby.
The dried model is buried in a sand box, a pouring gate and a dead head protrude out of the plane of the sand box, and then the mould is tamped on a vibration platform. Specifically, the pouring gate and the riser are arranged on the bottom surface of the casting, and the sand mold adopts silica sand or jewel sand.
The temperature of the cast iron water for the lost foam is 1600 ℃, and the molten iron is cast once during casting, so that the continuous casting cannot be carried out.
Annealing the casting, which comprises the following steps: heating to 750 ℃ within 4 hours, keeping the temperature for 4 hours at the constant temperature of 700 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging.
Example 2
As shown in fig. 2-5, a long-life mill center cover for coal mill, mill center cover base member 1 including the toper structure, base member 1 includes hoisting platform 2 and the mounting platform 3 at bottom edge at top center, the surface at base member 1 middle part, hoisting platform 2's lateral wall and mounting platform 3's top surface all has built-up welding to have enhancement layer 5, the internal surface casting of base member 1 has a plurality of strengthening ribs 4, hoisting platform 2's middle part is seted up threaded hole 2a, threaded hole 2a internal thread connection has high manganese steel bulb 6, a plurality of counter bores 3a have been seted up on mounting platform 3.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A manufacturing method of a long-life grinding disc center cover for a coal mill is characterized by comprising the following steps:
s1, casting: casting a base body (1) of the grinding disc center cover, wherein the base body (1) comprises a hoisting platform (2) at the top center and a mounting platform (3) at the bottom edge, and simultaneously casting a plurality of reinforcing ribs (4) on the inner surface of the base body (1);
s2, grinding: the outer surface of the middle part of the matrix (1), the side wall of the hoisting platform (2) and the top surface of the mounting platform (3) are processed by shot blasting to expose metallic luster;
s3, surfacing: a plurality of mutually connected reinforcing rings are formed on the outer surface of the middle part of the base body (1), the side wall of the hoisting platform (2) and the top surface of the mounting platform (3) in a surfacing mode to form a reinforcing layer (5);
s4, processing: processing the top surface of the hoisting platform (2) and the bottom surface of the mounting platform (3), processing a threaded hole (2 a) in the middle of the hoisting platform (2), and processing a plurality of countersunk holes (3 a) on the mounting platform (3) by electric spark;
and S5, mounting the pre-hardened high manganese steel ball head (6).
2. The manufacturing method of the long-life grinding disc center cover for the coal mill is characterized in that the base body (1) comprises the following components in percentage by mass: c: less than or equal to 0.30%, mn: less than or equal to 1.20 percent, P: less than or equal to 0.04 percent, S: less than or equal to 0.04 percent, si: less than or equal to 0.50 percent.
3. The manufacturing method of the long-life grinding disc center cover for the coal mill is characterized in that the base body (1) adopts a lost foam casting process and comprises the following steps: manufacturing a lost foam model, brushing paint on the model, drying, boxing a sand box, casting under negative pressure and annealing.
4. The manufacturing method of the long-life grinding disc center cover for the coal mill as claimed in claim 3, wherein the white mould is produced by adopting mould foaming molding or cutting equipment in the lost foam casting, and the white mould is made of EPS.
5. The method for manufacturing the long-life grinding disc center cover for the coal grinding machine as claimed in claim 3, wherein the model brushing coating coats the surface of the model by dip coating for 3 times.
6. The method for manufacturing the long-life millstone center cover for the coal mill as claimed in claim 3, characterized in that the lost foam model is placed in a drying chamber for drying, the indoor humidity is lower than 30%, the drying temperature is not higher than 50 ℃, and the thickness of the dried coating is not lower than 1.5mm.
7. The manufacturing method of the long-life grinding disc center cover for the coal mill as claimed in claim 3, wherein the sand mold is silica sand or jewel sand.
8. The method for manufacturing a long-life grinding disc center cover for a coal mill according to claim 3, wherein the temperature of the lost foam casting molten iron is 1600 ℃.
9. The method for manufacturing the long-life grinding disc center cover for the coal mill as claimed in claim 3, wherein the annealing treatment comprises the following specific steps: heating to 750 ℃ within 4 hours, keeping the temperature for 4 hours at the constant temperature of 700 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging.
10. The manufacturing method of the long-life grinding disc center cover for the coal mill is characterized in that the thickness of the reinforcing layer (5) is 12mm, and the HRC is more than or equal to 65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171649.0A CN115464342B (en) | 2022-09-26 | 2022-09-26 | Manufacturing method of long-service-life millstone center cover for coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171649.0A CN115464342B (en) | 2022-09-26 | 2022-09-26 | Manufacturing method of long-service-life millstone center cover for coal mill |
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| Publication Number | Publication Date |
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| CN115464342A true CN115464342A (en) | 2022-12-13 |
| CN115464342B CN115464342B (en) | 2024-03-26 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199781A (en) * | 1997-05-19 | 1998-11-25 | 杨文财 | Production method of the millstone for ball grinding mill |
| US6000457A (en) * | 1998-06-26 | 1999-12-14 | Buntrock Industries, Inc. | Investment casting mold and method of manufacture |
| JP2003147459A (en) * | 2001-11-09 | 2003-05-21 | Toto Ltd | Copper alloy cast member and method for producing the same |
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| KR20030076889A (en) * | 2002-03-23 | 2003-09-29 | 최지태 | The method adult form of disk cup grind and disk cup grind |
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| CN101804524A (en) * | 2010-03-11 | 2010-08-18 | 华北电力大学 | Powder-cored welding wire for abrasion prevention of grinding roller and grinding disc and cladding method thereof |
| CN104889327A (en) * | 2015-06-18 | 2015-09-09 | 山西威龙铁路机车制动配件制造有限公司 | Lost foam casting die and method for braking disc |
| JP2017140624A (en) * | 2016-02-09 | 2017-08-17 | 株式会社亀山鋳造所 | Casting apparatus for lost foam pattern casting method |
| CN207839117U (en) * | 2017-12-12 | 2018-09-11 | 济南重工股份有限公司 | A kind of mill lid of medium-speed pulverizer |
| CN109434012A (en) * | 2018-12-31 | 2019-03-08 | 兴化市剑达铸造有限公司 | A kind of lost foam casting process of high-mechanical property casting |
| CN110076296A (en) * | 2019-04-24 | 2019-08-02 | 焦作市威尔瑞福工业技术有限公司 | A kind of NEW TYPE OF COMPOSITE tooth plate casting method of high-power high throughput crusher |
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2022
- 2022-09-26 CN CN202211171649.0A patent/CN115464342B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199781A (en) * | 1997-05-19 | 1998-11-25 | 杨文财 | Production method of the millstone for ball grinding mill |
| US6000457A (en) * | 1998-06-26 | 1999-12-14 | Buntrock Industries, Inc. | Investment casting mold and method of manufacture |
| JP2003147459A (en) * | 2001-11-09 | 2003-05-21 | Toto Ltd | Copper alloy cast member and method for producing the same |
| KR20030076889A (en) * | 2002-03-23 | 2003-09-29 | 최지태 | The method adult form of disk cup grind and disk cup grind |
| CN2558491Y (en) * | 2002-08-18 | 2003-07-02 | 石家庄博深工具有限公司 | Diamond grinding disk |
| CN101608546A (en) * | 2009-07-30 | 2009-12-23 | 西安煤矿机械有限公司 | Prolong the guide slip shoe processing technology in application life |
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| CN110076296A (en) * | 2019-04-24 | 2019-08-02 | 焦作市威尔瑞福工业技术有限公司 | A kind of NEW TYPE OF COMPOSITE tooth plate casting method of high-power high throughput crusher |
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| CN115464342B (en) | 2024-03-26 |
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