CN112589241A - Vertical grinding roller core inclined plane welding repair method - Google Patents
Vertical grinding roller core inclined plane welding repair method Download PDFInfo
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- CN112589241A CN112589241A CN201910946036.1A CN201910946036A CN112589241A CN 112589241 A CN112589241 A CN 112589241A CN 201910946036 A CN201910946036 A CN 201910946036A CN 112589241 A CN112589241 A CN 112589241A
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- welding
- roller core
- repair method
- inclined plane
- vertical roller
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a welding repair method for an inclined plane of a vertical grinding roller core, which comprises a pre-welding preparation step, a welding step and a post-welding treatment step, wherein argon gas-shielded arc welding is adopted in the welding step. In the argon gas-shielded arc welding, the shielding gas is the mixed gas of argon and carbon dioxide. When in welding operation, direct current reverse connection, short arc welding and narrow welding paths are adopted, and interruption is not easy to occur in midway. During welding, the inclined surface of the roller core is placed upwards, the pit part on the conical surface is filled and leveled in advance, and then continuous overlaying welding is carried out in sequence. The invention has the beneficial effects that: the roll core is as new after being welded, the strength of the inclined plane is higher than that of ductile iron, the service life is longer than that of a newly cast ductile iron roll core, the damping effect and the bearing protection can be achieved, the hardness of the inclined plane is high, the welding fusion is good, the wear resistance is enhanced, and the service life is prolonged.
Description
Technical Field
The invention belongs to the technical field of vertical mills, and particularly relates to the field of slope repairing of a roller core of a vertical mill.
Background
The roll core of the HRM vertical mill is cast and processed by using the ductile iron, and can effectively absorb shock and protect the grinding roll and the bearing by using the characteristics of the ductile iron, but in the long-time use process, due to factors such as rotation, vibration and the like, extrusion and friction are generated between the roll core and a compression ring, and in addition, no material is blown along with wind, so that the roll core is abraded, the roll core needs to be repaired or replaced by a new roll core, otherwise, normal production is influenced.
The method for repairing the worn roll core in the current market comprises the following steps:
preparation before welding
1) Checking the size of the welding surface, determining the welding quantity required to be welded, cleaning rust on the surface to be welded, and removing all impurities (including removing dust, oil and water) on the welding surface.
2) The welding materials are selected as follows: the graphite cast iron welding rod with pure nickel core is dried, baked at 150 deg.c usually with cutting gas flame and maintained for about 1 hr.
3) Preheating before welding: an electromagnetic heating heater is adopted to preheat the conical surface to be welded to the temperature of 150 ℃ and 200 ℃, and the preheating and heat preservation time is not less than 1 hour. .
4) The welding equipment is a direct current welding machine.
Welding of
The specific technical parameters are as follows: the type of the cast iron welding rod: SH.Z308 (EZNi-1), diameter: phi 3.5, welding current of a direct current welding machine: 100-.
The welding technical measures are as follows: during welding operation, direct current welding and manual electrode holder operation are adopted, spatters, such as cracks, incomplete fusion, slag inclusion, air holes and other defects which affect the welding quality, are timely removed in the welding process, and repair welding is continued after the defects are removed; and removing welding slag after welding one welding line.
Post-weld treatment
And after welding, baking by using cutting gas flame to eliminate stress, simultaneously preserving heat for about 2 hours by using rock wool, and after the workpiece is cooled, processing on a vertical lathe.
The cast iron welding rods are adopted for welding, the price of welding materials is high, the welding speed is slow, one welding rod is wasted, the number of welding joints is large, the size of surfacing welding is not well controlled, sometimes the welding is deviated and uneven, sometimes the size cannot be obtained after machining, surfacing welding is carried out again, the labor and the time are wrong, and delivery and use of users are affected; moreover, the phenomenon of fusion defect and block dropping sometimes occurs, and the comprehensive cost is higher; therefore, the method is continuously researched and tried, firstly, from the consideration of material cost, 427 basic welding rods are tried to be used, and other conditions and processes are unchanged, so that the material cost is reduced, but the problems of welding fusion exist, the strength is not enough, the blocks are easy to fall off, and the service life is difficult to guarantee.
In order to improve the quality of the maintenance product, the same process is adopted, and then a stainless steel welding rod (SS.A 307,200-250 ℃, 110 and 160 Amp) is used for welding, so that the quality after maintenance is improved, but the problems of low welding speed, material waste and the like exist.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for welding and repairing the inclined plane of the roller core of the vertical grinding roller, which has the advantages of high welding speed, material saving and good quality.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method for repairing the inclined plane welding of the vertical grinding roller core comprises a pre-welding preparation step, a welding step and a post-welding treatment step, wherein argon gas-shielded welding is adopted in the welding step.
In the argon gas-shielded arc welding, the shielding gas is the mixed gas of argon and carbon dioxide.
The content of argon in the mixed gas is 78-82% of the total amount, and the content of carbon dioxide is 18-22% of the total amount.
When in welding operation, direct current reverse connection, short arc welding and narrow welding paths are adopted, and interruption is not easy to occur in midway.
During welding, the inclined surface of the roller core is placed upwards, the pit part on the conical surface is filled and leveled in advance, and then continuous overlaying welding is carried out in sequence.
During welding, the welding is started from the lower end of the inclined plane, and one third of each two welding seams are overlapped.
During the welding process, the interlayer temperature is controlled at 150-250 ℃.
In the welding process, rock wool is used for covering and insulating the welded part.
In the pre-welding preparation step, the wear slope is slightly machined by a vertical lathe, so that the height difference of the welding part of the slope is reduced.
The roller core is a ductile iron roller core, and the welding material in the welding step is a stainless steel welding wire.
The invention has the beneficial effects that: the roll core is as new after being welded, the strength of the inclined plane is higher than that of ductile iron, the service life is longer than that of a newly cast ductile iron roll core, the damping effect and the bearing protection can be achieved, the hardness of the inclined plane is high, the welding fusion is good, the wear resistance is enhanced, and the service life is prolonged.
Detailed Description
The present invention will be further described with reference to the following examples.
The method for welding and repairing the inclined plane of the roller core of the vertical grinding machine comprises the following steps:
1. preparation before welding
1) Firstly, the abrasion inclined plane is checked to determine abrasion loss, and in order to facilitate welding operation, a small amount of processing is carried out on the abrasion inclined plane on a vertical lathe, so that the height difference of the welding part of the inclined plane is reduced;
2) checking the size of a welding surface, determining the welding quantity needing to be welded, cleaning rust on the surface to be welded, and removing all impurities (including removing dust, oil and water) on the welding surface;
3) the welding materials are selected as follows: the surfacing welding wire is ER316L (MIG welding wire), the welding wire needs to be dried, and the shielding gas is mixed gas (Ar + CO 2) 2 component/composition information of argon and carbon dioxide: 78-82% of Ar (V/V) and 18-22% of C02 (V/V);
4) preheating before welding: preheating the conical surface to be welded to 100-150 ℃ by adopting an electromagnetic heating belt, wherein the preheating and heat preservation time is not less than 2 hours;
2. welding of
1) Welding materials and parameter control: argon gas-shielded arc welding is adopted, and the specific technical parameters are as follows: diameter of welding wire: Φ 1.2 welding current: 180-220A welding voltage: 22-26V gas flow: 6-12L/min;
2) the welding technical measures are as follows:
(1) when in welding operation, direct current reverse connection, short arc welding and narrow welding paths are adopted, and interruption is not easy to occur in midway;
(2) before welding, the inclined surface of the roller core is placed upwards, the pit part on the conical surface is filled and leveled in the welding process, and then continuous overlaying welding is carried out in sequence;
(3) during welding, the welding is started from the lower end of the inclined plane, and every two welding seams are laminated by one third;
(4) in the welding process, the interlayer temperature is controlled to be 150-250 ℃ (measured by using a temperature measuring gun);
(5) if the defects of cracks, non-fusion, slag inclusion, pores and the like which influence the welding quality are found, the repair welding is continued after the defects are removed;
(6) hammering the welding seam to eliminate stress after welding one welding seam, and simultaneously removing oxide skin and welding slag;
(7) because argon gas-shielded arc welding is used, strict windproof measures are required;
(8) in the welding process, rock wool is used for heat preservation of the welded part, so that the phenomenon that the welding quality is affected due to too fast temperature reduction is prevented;
3. post-weld treatment
1) Immediately performing heat preservation treatment by using a ceramic heater or an electromagnetic heater after welding to remove stress, wherein the heating temperature is 150 ℃ and 250 ℃, and the heat preservation time is more than 2 hours;
2) after heating, covering a heat-insulating material for slow cooling, wherein the heat-insulating material can be a silica-alumina needle-punched heat-insulating blanket or other heat-insulating materials capable of resisting high temperature;
3) after the workpiece is cooled, slightly grinding and flattening the welding line by using an angular grinding wheel and other tools, and removing splashing;
4) processing the welded and repaired roller core on a vertical lathe according to the size and tolerance requirements of the original design drawing;
5) after processing, checking each relevant size;
the welding processing effect is as follows: the roll core is as new after being welded, the strength of the inclined plane is higher than that of ductile iron, the service life is longer than that of a newly cast ductile iron roll core, the damping effect and the bearing protection can be achieved, the hardness of the inclined plane is high, the welding fusion is good, the wear resistance is enhanced, and the service life is prolonged.
Economic and social benefits are as follows: after a new process of a new material is changed from 2015, more than 60 roller cores are maintained, the cost of each roller core is different from that of a newly manufactured roller core by more than 6 ten thousand yuan, compared with ductile iron and other welding rods, the service life is prolonged by 2-3 times, the shutdown maintenance time, the transportation cost and the like are comprehensively calculated, each roller core saves more than 6 ten thousand yuan for a user on average, the sum of the cost is saved by nearly 300 ten thousand for the user, and the profit is created for a company by more than 80 ten thousand; the system is favored by users through user use, after-sale service investigation and information feedback. The waste roller core is welded, maintained and utilized, the scrap ductile iron is reduced by 220 tons, social resources are saved, environmental pollution is reduced, carbon emission is reduced, and good economic benefit and social benefit are obtained.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, and that various modifications and alterations can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The welding repair method for the inclined plane of the vertical grinding roller core comprises the steps of preparation before welding, welding and post-welding treatment, and is characterized in that: argon gas-shielded welding is adopted in the welding step.
2. The vertical roller core bevel welding repair method of claim 1, characterized in that: in the argon gas-shielded arc welding, the shielding gas is the mixed gas of argon and carbon dioxide.
3. The vertical roller core bevel welding repair method of claim 2, characterized in that: the content of argon in the mixed gas is 78-82% of the total amount, and the content of carbon dioxide is 18-22% of the total amount.
4. The vertical roller core bevel welding repair method of claim 3, characterized in that: in the welding step, direct current reverse connection, short arc welding and narrow welding beads are adopted, and interruption in the midway is not easy.
5. The vertical roller core bevel welding repair method of claim 4, characterized in that: in the welding step, the inclined surface of the roller core is placed upwards, and the pit part on the conical surface is filled and leveled in the welding process, and then continuous overlaying is carried out in sequence.
6. The vertical roller core bevel welding repair method of claim 5, characterized in that: in the welding step, the welding is started from the lower end of the inclined plane, and one third of each two welding seams are overlapped.
7. The vertical roller core bevel welding repair method of claim 6, characterized in that: the interlayer temperature in the welding step is controlled at 150-250 ℃.
8. The method for repairing the bevel welding of the vertical roller core of the vertical roller according to any one of claims 1 to 7, wherein: in the welding step, the welded part is covered by rock wool for heat preservation.
9. The vertical roller core bevel welding repair method of claim 1, characterized in that: in the pre-welding preparation step, the wear slope is slightly machined by a vertical lathe, so that the height difference of the welding part of the slope is reduced.
10. The method for repairing the bevel welding of the vertical roller core of the vertical roller according to any one of claims 1 to 7, wherein: the roller core is a ductile iron roller core, and the welding material in the welding step is a stainless steel welding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946036.1A CN112589241A (en) | 2019-10-01 | 2019-10-01 | Vertical grinding roller core inclined plane welding repair method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910946036.1A CN112589241A (en) | 2019-10-01 | 2019-10-01 | Vertical grinding roller core inclined plane welding repair method |
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| CN112589241A true CN112589241A (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910946036.1A Pending CN112589241A (en) | 2019-10-01 | 2019-10-01 | Vertical grinding roller core inclined plane welding repair method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478170A (en) * | 2021-08-18 | 2021-10-08 | 重庆大学 | Welding and forging composite process and device for remanufacturing surface of metallurgical roller way |
Citations (6)
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| KR20080050867A (en) * | 2006-12-04 | 2008-06-10 | 주식회사 정원엔지니어링 | Multi-lay welding process for manufacture and repair of pulverizer grinding roll and table liner |
| CN102785004A (en) * | 2012-09-10 | 2012-11-21 | 郑州市郑蝶阀门有限公司 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
| CN105057846A (en) * | 2015-07-09 | 2015-11-18 | 苏州优霹耐磨复合材料有限公司 | Grinding roll built-up welding technology |
| CN105414709A (en) * | 2015-12-15 | 2016-03-23 | 含山县大力精密机械有限公司 | Welding repair method for large nodular iron castings |
| CN109202366A (en) * | 2018-11-12 | 2019-01-15 | 湖北秦鸿新材料股份有限公司 | A kind of online build-up welding repair method of large size grinding roller of vertical mill |
| JP2019030830A (en) * | 2017-08-04 | 2019-02-28 | 株式会社ウェルディングアロイズ・ジャパン | Method for repairing roller of vertical type mill |
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2019
- 2019-10-01 CN CN201910946036.1A patent/CN112589241A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080050867A (en) * | 2006-12-04 | 2008-06-10 | 주식회사 정원엔지니어링 | Multi-lay welding process for manufacture and repair of pulverizer grinding roll and table liner |
| CN102785004A (en) * | 2012-09-10 | 2012-11-21 | 郑州市郑蝶阀门有限公司 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
| CN105057846A (en) * | 2015-07-09 | 2015-11-18 | 苏州优霹耐磨复合材料有限公司 | Grinding roll built-up welding technology |
| CN105414709A (en) * | 2015-12-15 | 2016-03-23 | 含山县大力精密机械有限公司 | Welding repair method for large nodular iron castings |
| JP2019030830A (en) * | 2017-08-04 | 2019-02-28 | 株式会社ウェルディングアロイズ・ジャパン | Method for repairing roller of vertical type mill |
| CN109202366A (en) * | 2018-11-12 | 2019-01-15 | 湖北秦鸿新材料股份有限公司 | A kind of online build-up welding repair method of large size grinding roller of vertical mill |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478170A (en) * | 2021-08-18 | 2021-10-08 | 重庆大学 | Welding and forging composite process and device for remanufacturing surface of metallurgical roller way |
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Application publication date: 20210402 |