CN115464342B - Manufacturing method of long-service-life millstone center cover for coal mill - Google Patents
Manufacturing method of long-service-life millstone center cover for coal mill Download PDFInfo
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- CN115464342B CN115464342B CN202211171649.0A CN202211171649A CN115464342B CN 115464342 B CN115464342 B CN 115464342B CN 202211171649 A CN202211171649 A CN 202211171649A CN 115464342 B CN115464342 B CN 115464342B
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- casting
- lost foam
- platform
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- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- 229910000617 Mangalloy Inorganic materials 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000010114 lost-foam casting Methods 0.000 claims description 12
- 238000003754 machining Methods 0.000 claims description 11
- 230000001680 brushing effect Effects 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 8
- 235000002245 Penicillium camembertii Nutrition 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 7
- 244000035744 Hura crepitans Species 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000003618 dip coating Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 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
- 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
- 239000000758 substrate Substances 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims 1
- 238000000227 grinding Methods 0.000 description 14
- 239000004484 Briquette Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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 manufacturing method of a long-service-life millstone center cover for a coal mill, which comprises the following steps: s1, casting; s2, polishing; s3, overlaying; s4, processing; s5, installing a pre-hardened high manganese steel ball head; the invention provides the manufacturing method of the long-service-life millstone center cover for the coal mill, which has the advantages that the process is simple, and the strength and the rigidity of the manufactured millstone center cover are greatly improved, so that the service life of the millstone center cover for the coal mill is long.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a manufacturing method of a long-service-life millstone 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 that: the coal briquette enters the coal mill from the coal falling port, falls on the rotary millstone, and is gradually diffused to the millstone edge under the action of centrifugal force, and when the coal briquette is diffused to the millstone edge, the milling roller on the millstone edge mills the coal briquette to grind the coal briquette into coal dust. In the actual use process, in order to prevent coal blocks from forming a stacking material in the center of the grinding disc, a center cover in the center of the grinding disc is arranged to be of 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 millstone center cover are limited, deformation can occur under long-term impact of coal blocks, and damage can occur under serious conditions, so that the service life of the millstone center cover is greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings of the prior art, and provides a manufacturing method of the long-service-life millstone center cover for the coal mill, which is simple in process and long in service life, and the strength and the rigidity of the manufactured millstone center cover are greatly improved.
The technical scheme for realizing the aim of the invention is as follows: a manufacturing method of a long-service-life millstone center cover for a coal mill comprises the following steps:
s1, casting: casting a base body of the millstone 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 subjected to shot blasting treatment to expose metallic luster;
s3, overlaying: a plurality of interconnected reinforcing rings are formed on 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 in a surfacing manner, so that a reinforcing layer is formed;
s4, processing: machining the top surface of the hoisting platform and the bottom surface of the mounting platform, machining threaded holes in the middle of the hoisting platform, and machining a plurality of countersunk holes in the mounting platform by electric spark;
s5, installing a 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 percent, S: less than or equal to 0.04 percent, si: less than or equal to 0.50 percent.
Further, the substrate adopts the lost foam casting process, and the steps are as follows: and (3) manufacturing a lost foam model, brushing paint on the model, drying, boxing by using a sand box, casting under negative pressure, and annealing.
Further, in lost foam casting, white mold production adopts mold foaming molding or cutting equipment to process and mold, and the white mold material is EPS.
Further, the surface of the model is coated by the model brushing coating in a dip-coating mode, and the model brushing coating is dip-coated 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 coating after drying is not lower than 1.5mm.
Further, the sand mold adopts silica sand or precious sand.
Further, the temperature of the lost foam casting molten iron is 1600 ℃.
Further, the specific steps of the annealing treatment are as follows: heating to 750 ℃ within 4 hours, keeping the temperature for 4 hours, keeping the constant temperature at 700 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging.
Further, the thickness of the reinforcing layer is 12mm, and 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 millstone center cover is cast through the lost foam casting process, the reinforcing layers are deposited 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, and meanwhile, a plurality of reinforcing ribs are cast on the inner surface of the base body, so that the strength and the rigidity of the millstone center cover are greatly improved, and meanwhile, the millstone center cover has wear resistance, so that the service life of the millstone center cover is prolonged;
(2) According to the invention, through the arrangement of the high manganese steel ball head, the grinding disc center cover is easier to fixedly hoist, so that the grinding disc center cover is more convenient to install and detach.
Drawings
In order that the invention may be more readily and clearly understood, a further detailed description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a top view of a center cover of the abrasive disc of the present invention;
FIG. 3 is a bottom view of the center cover of the abrasive disc of 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 high manganese steel ball head in a center cover of a grinding disc manufactured by the invention.
In the figure: 1. a base; 2. hoisting the platform; 2a, threaded holes; 3. a mounting platform; 3a, countersunk holes; 4. reinforcing ribs; 5. a reinforcing layer; 6. high manganese steel ball head.
Detailed Description
Example 1
As shown in fig. 1 to 5, a method for manufacturing a long-service-life millstone center cover for a coal mill comprises the following steps:
s1, casting: a base body 1 of a grinding disc center cover is cast, the base body 1 comprises a lifting platform 2 at the top center and a mounting platform 3 at the bottom edge, and a plurality of reinforcing ribs 4 are cast on the inner surface of the base body 1;
s2, polishing: 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 subjected to shot blasting treatment to expose metallic luster;
s3, overlaying: a plurality of interconnected 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 manner to form a reinforcing layer 5;
s4, processing: machining the top surface of the hoisting platform 2 and the bottom surface of the mounting platform 3, machining threaded holes 2a in the middle of the hoisting platform 2, and machining a plurality of countersunk holes 3a on the mounting platform 3 by electric spark;
s5, installing a pre-hardened high manganese steel ball head 6.
The base body 1 of the millstone center cover is cast through the lost foam casting process, the reinforcing layers are all deposited 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, and meanwhile, the plurality of reinforcing ribs 4 are cast on the inner surface of the base body 1, so that the strength and the rigidity of the millstone center cover are greatly improved, and meanwhile, the wear-resisting performance is achieved, and the service life of the millstone 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 more than or equal to 65, after casting of the base body 1, 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, and the high manganese steel ball head 6 is arranged to enable the grinding disc center cover to be fixed and hoisted more easily, so that the grinding disc center cover is convenient to mount and dismount. The taper angle α of the base body 1 of the center cover of the grinding disc in the present invention is not limited to 120 ° set in the present embodiment, and may be adjusted according to actual conditions, so that the present invention may be applied to MPS medium speed coal mills or HP bowl coal mills.
The matrix 1 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 percent, S: less than or equal to 0.04 percent, si: less than or equal to 0.50 percent. Specifically, the material of the matrix 1 is ZG230-450 material.
The substrate 1 adopts the lost foam casting process, and comprises the following steps: and (3) manufacturing a lost foam model, brushing paint on the model, drying, boxing by using a sand box, casting under negative pressure, and annealing. The base body 1 of the millstone center cover is cast through the lost foam casting process, so that the design is flexible, the investment and production cost are low, the casting precision is high, and the production is clean.
In lost foam casting, the white mold is produced by adopting mold foaming molding or cutting equipment to process molding, so that the dimension consistency of the center cover of each set of grinding disc is ensured, the white mold is made of EPS, the dimensions of the white mold are enlarged by 2% to serve as reserved shrinkage, and the casting dimension is ensured to meet the drawing processing requirement.
The surface of the model is coated by the model brushing coating in a dip-coating mode, and the model brushing coating is dip-coated for 3 times. And before the model is painted, drying treatment is carried out to remove the surface moisture. After dip coating, it should be ensured that the coating is free of defects, sagging or air bubbles.
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 coating after drying is not lower than 1.5mm. After the paint is dried, the coating is ensured to be uniform and dry and not to crack, the pattern is correspondingly checked, the coating is in missing and crack repair (the repaired model is required 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 riser protrude out of the plane of the sand box, and then jolt on a vibrating platform. Specifically, the pouring gate and the riser are arranged on the bottom surface of the casting, and the sand mould adopts silica sand or precious sand.
The temperature of the lost foam casting molten iron is 1600 ℃, and the molten iron is cast at one time during casting, so that intermittent casting is not required.
The casting is annealed, and the specific steps are as follows: heating to 750 ℃ within 4 hours, keeping the temperature for 4 hours, keeping the constant temperature at 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 lid for coal pulverizer, including the mill center lid base member 1 of toper structure, the base member 1 includes the hoist and mount platform 2 at top center and the mounting platform 3 at bottom edge, the surface at base member 1 middle part, hoist and mount platform 2's lateral wall and the top surface of mounting platform 3 have all built-up weld enhancement layer 5, the internal surface casting of base member 1 has a plurality of strengthening ribs 4, screw hole 2a has been seted up at hoist and mount platform 2's middle part, screw hole 2a internal thread connection has high manganese steel bulb 6, a plurality of countersinks 3a have been seted up on the mounting platform 3.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, and improvements may be made within the spirit and principles of the invention.
Claims (1)
1. The manufacturing method of the long-service-life millstone center cover for the coal mill is characterized by comprising the following steps of:
s1, casting: a base body (1) for casting a millstone 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 a plurality of reinforcing ribs (4) are cast on the inner surface of the base body (1);
s2, polishing: 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 subjected to shot blasting treatment to expose the metallic luster;
s3, overlaying: 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 manner to form a reinforcing layer (5);
s4, processing: machining the top surface of the hoisting platform (2) and the bottom surface of the mounting platform (3), machining threaded holes (2 a) in the middle of the hoisting platform (2), and machining a plurality of countersunk holes (3 a) on the mounting platform (3) by electric spark;
s5, installing a pre-hardened high manganese steel ball head (6);
the matrix (1) comprises the following components in percentage by mass: c:，Mn：/>，P：，S：/>，Si：/>；
the substrate (1) adopts the lost foam casting process, and comprises the following steps: manufacturing a lost foam model, brushing paint on the model, drying, boxing by a sand box, casting under negative pressure, and annealing;
the white mold is produced by adopting mold foaming molding or cutting equipment for processing molding in lost foam casting, and the white mold is made of EPS;
the surface of the model is coated by the model brushing coating in a dip-coating mode, and the model brushing coating is dip-coated for 3 times;
the lost foam model is placed in a drying chamber for drying, and the indoor humidity is lower than that of the lost foam modelThe drying temperature is not higher than +.>The thickness of the coating after being dried is not less than 1.5mm;
the sand mould in the sand box adopts silica sand or precious sand;
the temperature of the lost foam casting molten iron is；
The specific steps of the annealing treatment are as follows: heating to within 4 hoursKeeping the temperature for 4 hours, wherein the constant temperature is +.>Preserving heat for 8 hours, and naturally cooling after discharging;
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115464342A CN115464342A (en) | 2022-12-13 |
| CN115464342B true CN115464342B (en) | 2024-03-26 |
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| CN202211171649.0A Active CN115464342B (en) | 2022-09-26 | 2022-09-26 | Manufacturing method of long-service-life millstone center cover for coal mill |
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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 |
| CN2558491Y (en) * | 2002-08-18 | 2003-07-02 | 石家庄博深工具有限公司 | Diamond grinding disk |
| KR20030076889A (en) * | 2002-03-23 | 2003-09-29 | 최지태 | The method adult form of disk cup grind and disk cup grind |
| 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 |
| 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 |
-
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 |
| 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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| Publication number | Publication date |
|---|---|
| CN115464342A (en) | 2022-12-13 |
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