CN104043502A - Surfacing welding type roller shell of bowl type coal mill and sectional surfacing welding method of roller shell surfacing welding layer - Google Patents
Surfacing welding type roller shell of bowl type coal mill and sectional surfacing welding method of roller shell surfacing welding layer Download PDFInfo
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- CN104043502A CN104043502A CN201310079070.6A CN201310079070A CN104043502A CN 104043502 A CN104043502 A CN 104043502A CN 201310079070 A CN201310079070 A CN 201310079070A CN 104043502 A CN104043502 A CN 104043502A
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Abstract
The invention discloses a surfacing welding type roller shell of a bowl type coal mill, the surfacing welding type roller comprises a tapered roller shell parent body, a large end and a small end of the tapered roller shell parent body are respectively provided with an annular bulge, the height of the annular bulge at the large end is greater than the height of the annular bulge at the small end; the outer surface of the roller shell parent body is provided with a roller shell surfacing welding layer, the roller shell surfacing welding layer extends from the annular bulge at the large end to the annular bulge at the small end; the roller shell surfacing welding layer is divided into four sections, the sum of the axial size of a first surfacing welding section located at the large end of the tapered roller shell parent body and the annular bulge at the large end accounts for 1 / 3 the axial size of the roller shell parent body. According to the practical roller shell wearing characteristics of the bowl type coal mill during grinding of raw coal containing more coal ores, pyrite, quartz sand and the like, the shape of the roller shell surfacing welding layer can be inrationally determined, and by use of a sectional surfacing welding method, the wear resistance of a surfacing material can be fully exerted, and the service life of the roller shell wear parts of the bowl type coal mill can be effectively improved. The invention also discloses the sectional surfacing welding method of the roller shell surfacing welding layer.
Description
Technical field
The present invention relates to a kind of Raymond bowl mill, be specifically related to a kind of overlaying-type roller shell of Raymond bowl mill.The invention still further relates to a kind of segmentation overlaying method of overlaying-type roller shell of Raymond bowl mill.
Background technology
At present, the whole world is all faced with the situation of energy scarcity, and suitable proportion has been occupied in thermal power generation in energy resource structure.
Raymond bowl mill in steam power plant need to use overlaying-type roller shell, and existing overlaying-type roller shell as shown in Figure 1, comprises the roller shell parent 1 of taper, and the outer surface of roller shell parent 1 is provided with roller shell overlay cladding 2.The overlaying-type roller shell of this structure, its roller shell overlay cladding 2 is the methods that adopt bimetal composite hard-face overlaying welding, and roller shell overlay cladding 2 is directly covered on roller shell parent 1.
In use, due to different colm and the extruding of roller shell surface, produce wearing and tearing, make the utilization rate of roller shell overlay cladding low, the service life of roller shell is short.
In addition, the method for existing bimetal composite hard-face overlaying welding, manufactures extremely difficultly, easily causes welding material fusion character and poor compatibility, does not reach according to the wear-resisting requirement in service life of expection.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of overlaying-type roller shell of Raymond bowl mill, the service life that it can improve roller shell greatly.
For solving the problems of the technologies described above, the technical solution of the overlaying-type roller shell of Raymond bowl mill of the present invention is:
Comprise the roller shell parent of taper, the big or small two ends of roller shell parent are respectively arranged with annular protrusion, hold greatly protruding height to be greater than the height of small end projection; Large end is protruding, small end is protruding and roller shell parent is formed in one;
The outer surface of roller shell parent is provided with roller shell overlay cladding; Roller shell overlay cladding extends to small end projection from large end projection;
Roller shell overlay cladding is divided into four sections, in the first built-up welding Duan Yu great of the large end of roller shell parent hold the summation of protruding axial dimension account for roller shell parent axial dimension 1/3.
The one-sided cross section of described large end projection is triangle; The one-sided cross section of described small end projection is trapezoidal.
The present invention also provides a kind of segmentation overlaying method of roller shell overlay cladding of overlaying-type roller shell of Raymond bowl mill, forms roller shell overlay cladding at the outer surface of roller shell parent, and its technical solution is, comprises the following steps:
The first step, fixes roller shell parent by frock; Manipulator is fixed on crosshead;
Second step, is installed on deflection machine by the frock that roller shell parent is housed; Rotation deflection machine, adjusts roller shell parent to horizontal level;
The 3rd step, in outer surface built-up welding the first built-up welding section, the second built-up welding section, the 3rd built-up welding section, the 4th built-up welding section respectively of roller shell parent, until heap is welded to the physical dimension of regulation;
It is the welding wire that adds the high-alloy steel of Alloy Elements Mo, B, Nb, rare earth that built-up welding adopts material, joins SH107 solder flux;
Every built-up welding section is carried out according to following technological specification:
The weld procedure specification of the first built-up welding section is: welding current I=480～540A, weldingvoltage U=29～31V, welding speed V=50 m/h;
The weld procedure specification of the second built-up welding section is: welding current I=450～500A, weldingvoltage U=28～30V, welding speed V=45 m/h;
The weld procedure specification of the 3rd built-up welding section is: welding current I=480～520A, weldingvoltage U=28～29V, welding speed V=60 m/h;
The weld procedure specification of the 4th built-up welding section is: welding current I=500～550A, weldingvoltage U=30～32V, welding speed V=55 m/h.
Described overlaying method is as follows:
Operation one, first built-up welding the second built-up welding section, weldering 1/3rd thickness; Built-up welding the first built-up welding section again, weldering 1/2nd thickness; Then built-up welding the 3rd built-up welding section, weldering 1/2nd thickness; Last built-up welding the 4th built-up welding section, weldering 1/4th thickness;
Operation two, first built-up welding the first built-up welding section, weldering 1/4th thickness; Built-up welding the second built-up welding section again, weldering 1/3rd thickness; Then built-up welding the 3rd built-up welding section, weldering 1/4th thickness; Last built-up welding the 4th built-up welding section, weldering 1/2nd thickness;
Operation three, 1/3rd thickness of first built-up welding the second built-up welding section remainder; / 4th thickness of built-up welding the 3rd built-up welding section remainder again; Then 1/4th thickness of built-up welding the first built-up welding section remainder; / 4th thickness of last built-up welding the 4th built-up welding section remainder;
Operation four, covers two-layer overlay cladding at the outer surface of the first built-up welding section, the second built-up welding section, the 3rd built-up welding section and the 4th built-up welding section, the physical dimension that the roller shell overlay cladding of roller shell parent outer surface is conformed with the regulations.
Wherein, adopt the combined material of high-chromium cast iron alloy+martensitic alloy for the welding wire of described the first built-up welding section;
Welding wire for described the second built-up welding section adopts high-chromium cast iron alloy material;
Adopt the combined material of high-chromium cast iron alloy+martensitic alloy for the welding wire of described the 3rd built-up welding section;
Welding wire for described the 4th built-up welding section adopts martensitic alloy material.
The technique effect that the present invention can reach is:
The present invention is according to the actual wear characteristic of Raymond bowl mill roller shell in the time milling the raw coal that contains more coal ore, pyrite, quartz sand etc., rationally determine the shape of roller shell overlay cladding, and adopt the method for segmentation built-up welding, existing technique for overlaying and roller shell wearing character poor compatibility are overcome, the defects such as low and roller shell life-span of roller shell overlay cladding utilization rate is low, can give full play to the anti-wear performance of resurfacing welding material, effectively improve the service life of the roller shell abrading section of Raymond bowl mill.
Roller shell of the present invention adopts special roller shell overlay cladding shape, can adaptation condition service condition, can greatly improve the utilization rate of roller shell overlay cladding, and the service life of improving roller shell.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the schematic diagram of prior art overlaying-type roller shell;
Fig. 2 is the schematic diagram of overlaying-type roller shell of the present invention;
Fig. 3 is the state of wear schematic diagram of existing overlaying-type roller shell.
Description of reference numerals in figure:
1 is roller shell parent, and 2 is roller shell overlay cladding,
3 is roller shell overlay cladding, and 4 is roller shell parent,
31 is the first built-up welding section, and 32 is the second built-up welding section,
33 is the 3rd built-up welding section, and 34 is the 4th built-up welding section,
41 is large end projection, and 42 is small end projection.
Detailed description of the invention
As shown in Figure 2, the overlaying-type roller shell of Raymond bowl mill of the present invention, comprises the roller shell parent 4 of taper, and the big or small two ends of roller shell parent 4 are respectively arranged with annular protrusion, and the one-sided cross section of large end projection 41 is triangle, and the one-sided cross section of small end projection 42 is trapezoidal;
The height of large end projection 41 is greater than the height of small end projection 42;
Large end projection 41, small end projection 42 and roller shell parent 4 are formed in one;
The outer surface of roller shell parent 4 is provided with roller shell overlay cladding 3; Roller shell overlay cladding 3 extends to small end projection 42 from large end projection 41;
Roller shell overlay cladding 3 is divided into four sections, the first built-up welding section 31 in the large end of roller shell parent 4 and the summation of the axial dimension of large end projection 41 account for roller shell parent 4 axial dimension L 1/3.
The present invention is directed to the actual wear situation of roller shell, by changing the external shape of roller shell parent, two ends at roller shell parent are provided with annular protrusion, this annular protrusion can replace the roller shell overlay cladding at two ends, not only solve the poor problem of two ends moulding of roller shell overlay cladding, and can reduce the volume of actual roller shell overlay cladding, overlay cladding can be fully used in actual use, thereby reach the object that improves overlay cladding utilization rate.
Because the wearing and tearing of roller shell overlay cladding mainly occur between the region in roller shell parent stage casing 1/3rd, the overlay cladding wearing and tearing at two ends are obviously less, the present invention is by changing the shape of roller shell overlay cladding, replace the roller shell overlay cladding at two ends with roller shell parent, can effectively utilize overlay cladding, the utilization rate of overlay cladding is improved.
The segmentation overlaying method of roller shell overlay cladding of the present invention, forms roller shell overlay cladding 3 at the outer surface of roller shell parent 4, comprises the following steps:
The first step, fixes roller shell parent 4 by frock; Three manipulators are fixed on crosshead;
Second step, is installed on deflection machine by the frock that roller shell parent 4 is housed; Rotation deflection machine, adjusting roller shell parent 4 to horizontal level (is the axis horizontal of roller shell parent 4, as shown in Figure 2);
The 3rd step, in outer surface built-up welding the first built-up welding section 31, the second built-up welding section 32, the 3rd built-up welding section 33, the 4th built-up welding section 34 respectively of roller shell parent 4, until heap is welded to the physical dimension of regulation;
It is that Φ 3.2mm, material are the welding wire that adds the high-alloy steel of the alloying elements such as Mo, B, Nb, rare earth that built-up welding adopts diameter, joins SH107 solder flux;
Wherein adopt the combined material of high-chromium cast iron alloy+martensitic alloy for the welding wire of the first built-up welding section 31;
Welding wire for the second built-up welding section 32 adopts high-chromium cast iron alloy material;
Adopt the combined material of high-chromium cast iron alloy+martensitic alloy for the welding wire of the 3rd built-up welding section 33;
Welding wire for the 4th built-up welding section 34 adopts martensitic alloy material;
Every built-up welding section is carried out according to following technological specification:
The weld procedure specification of the first built-up welding section 31 is: welding current I=480～540A, weldingvoltage U=29～31V, welding speed V=50 m/h;
The weld procedure specification of the second built-up welding section 32 is: welding current I=450～500A, weldingvoltage U=28～30V, welding speed V=45 m/h;
The weld procedure specification of the 3rd built-up welding section 33 is: welding current I=480～520A, weldingvoltage U=28～29V, welding speed V=60 m/h;
The weld procedure specification of the 4th built-up welding section 34 is: welding current I=500～550A, weldingvoltage U=30～32V, welding speed V=55 m/h;
Concrete overlaying method is as follows:
Operation one, first built-up welding the second built-up welding section 32, weldering 1/3rd thickness; Built-up welding the first built-up welding section 31 again, weldering 1/2nd thickness; Then built-up welding the 3rd built-up welding section 33, weldering 1/2nd thickness; Last built-up welding the 4th built-up welding section 34, weldering 1/4th thickness;
Operation two, first built-up welding the first built-up welding section 31, weldering 1/4th thickness; Built-up welding the second built-up welding section 32 again, weldering 1/3rd thickness; Then built-up welding the 3rd built-up welding section 33, weldering 1/4th thickness; Last built-up welding the 4th built-up welding section 34, weldering 1/2nd thickness;
Operation three, 1/3rd thickness of first built-up welding the second built-up welding section 32 remainders; / 4th thickness of built-up welding the 3rd built-up welding section 33 remainders again; Then 1/4th thickness of built-up welding the first built-up welding section 31 remainders; / 4th thickness of last built-up welding the 4th built-up welding section 34 remainders;
Operation four, covers two-layer overlay cladding, the physical dimension that the roller shell overlay cladding 3 of roller shell parent 4 outer surfaces is conformed with the regulations at the outer surface of the first built-up welding section 31, the second built-up welding section 32, the 3rd built-up welding section 33 and the 4th built-up welding section 34.
It is the high-alloy steel that adds the alloying elements such as Mo, B, Nb, rare earth that welding wire of the present invention adopts material, the wearability of this solder wire material is good, can improve the hardness (anti-plasticity) of the softer matrix face of layer, thereby reduce the volume of overlay cladding, improve the practical efficiency of overlay cladding, reduce the manufacturing cost of roller shell.
In welding wire of the present invention, add the alloying elements such as Mo, B, Nb, rare earth, the abrasive wear that can make the hardness particle diameter and distribution of the carbide hard phase of layer be conducive to hardness mineral in anti-coal reduces alloying pellet and comes off, anti-wear performance is stepped to a new level, all the other positions rationally add, or reduce and improve alloying element, meet the needs of wearability, remarkable in economical benefits.
The present invention can solve the fusion character of grinding roller shape chamber built-up welding of piecemeal and compatible technical barrier.
Because all greatest wear position of Raymond bowl mill roller shell is all about from large end 1/3rd positions, as shown in Figure 3, if directly built-up welding, not only can not reach the requirement of the wear-resisting use life expectancy of abrasive wear, and the realization of this process, difficulty is larger, and is not easy to realize.The present invention is according to abrasive wear curve and can grind coefficient, adopts the method for segmentation built-up welding to improve the friction durability of roller shell overlay cladding.
Segmentation overlaying method of the present invention can solve in a section parts, and four kinds of materials can fuse mutually, reaches again the technical barrier of compatible match materials.
The present invention can change the shape of roller shell overlay cladding, can reduce resurfacing welding material 20% left and right, thereby greatly improves the utilization rate of overlay cladding, because the price of overlay cladding is high more a lot of than the price of roller shell parent, therefore can greatly reduce like this manufacturing cost of roller shell.
Claims (5)
1. an overlaying-type roller shell for Raymond bowl mill, is characterized in that: comprise the roller shell parent of taper, the big or small two ends of roller shell parent are respectively arranged with annular protrusion, hold greatly protruding height to be greater than the height of small end projection; Large end is protruding, small end is protruding and roller shell parent is formed in one;
The outer surface of roller shell parent is provided with roller shell overlay cladding; Roller shell overlay cladding extends to small end projection from large end projection;
Roller shell overlay cladding is divided into four sections, in the first built-up welding Duan Yu great of the large end of roller shell parent hold the summation of protruding axial dimension account for roller shell parent axial dimension 1/3.
2. the overlaying-type roller shell of Raymond bowl mill according to claim 1, is characterized in that: the one-sided cross section of described large end projection is triangle; The one-sided cross section of described small end projection is trapezoidal.
3. a segmentation overlaying method for the roller shell overlay cladding of the overlaying-type roller shell of Raymond bowl mill, forms roller shell overlay cladding at the outer surface of roller shell parent, it is characterized in that, comprises the following steps:
The first step, fixes roller shell parent by frock; Manipulator is fixed on crosshead;
Second step, is installed on deflection machine by the frock that roller shell parent is housed; Rotation deflection machine, adjusts roller shell parent to horizontal level;
The 3rd step, in outer surface built-up welding the first built-up welding section, the second built-up welding section, the 3rd built-up welding section, the 4th built-up welding section respectively of roller shell parent, until heap is welded to the physical dimension of regulation;
It is the welding wire that adds the high-alloy steel of Alloy Elements Mo, B, Nb, rare earth that built-up welding adopts material, joins SH107 solder flux;
Every built-up welding section is carried out according to following technological specification:
The weld procedure specification of the first built-up welding section is: welding current I=480～540A, weldingvoltage U=29～31V, welding speed V=50 m/h;
The weld procedure specification of the second built-up welding section is: welding current I=450～500A, weldingvoltage U=28～30V, welding speed V=45 m/h;
The weld procedure specification of the 3rd built-up welding section is: welding current I=480～520A, weldingvoltage U=28～29V, welding speed V=60 m/h;
The weld procedure specification of the 4th built-up welding section is: welding current I=500～550A, weldingvoltage U=30～32V, welding speed V=55 m/h.
4. the segmentation overlaying method of the roller shell overlay cladding of the overlaying-type roller shell of Raymond bowl mill according to claim 3, is characterized in that: the combined material that adopts high-chromium cast iron alloy+martensitic alloy for the welding wire of described the first built-up welding section;
Welding wire for described the second built-up welding section adopts high-chromium cast iron alloy material;
Adopt the combined material of high-chromium cast iron alloy+martensitic alloy for the welding wire of described the 3rd built-up welding section;
Welding wire for described the 4th built-up welding section adopts martensitic alloy material.
5. the segmentation overlaying method of the roller shell overlay cladding of the overlaying-type roller shell of Raymond bowl mill according to claim 3, is characterized in that: the overlaying method of described the 3rd step is as follows:
Operation one, first built-up welding the second built-up welding section, weldering 1/3rd thickness; Built-up welding the first built-up welding section again, weldering 1/2nd thickness; Then built-up welding the 3rd built-up welding section, weldering 1/2nd thickness; Last built-up welding the 4th built-up welding section, weldering 1/4th thickness;
Operation two, first built-up welding the first built-up welding section, weldering 1/4th thickness; Built-up welding the second built-up welding section again, weldering 1/3rd thickness; Then built-up welding the 3rd built-up welding section, weldering 1/4th thickness; Last built-up welding the 4th built-up welding section, weldering 1/2nd thickness;
Operation three, 1/3rd thickness of first built-up welding the second built-up welding section remainder; / 4th thickness of built-up welding the 3rd built-up welding section remainder again; Then 1/4th thickness of built-up welding the first built-up welding section remainder; / 4th thickness of last built-up welding the 4th built-up welding section remainder;
Operation four, covers two-layer overlay cladding at the outer surface of the first built-up welding section, the second built-up welding section, the 3rd built-up welding section and the 4th built-up welding section, the physical dimension that the roller shell overlay cladding of roller shell parent outer surface is conformed with the regulations.
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| CN107283019A (en) * | 2017-05-12 | 2017-10-24 | 中信重工机械股份有限公司 | A kind of big end of vertical grinding roll cover with weld generation casting processing method |
| CN108406238A (en) * | 2018-04-09 | 2018-08-17 | 西南交通大学 | A kind of two-phase lamellar structure steel plate and preparation method thereof |
| CN108971899A (en) * | 2018-08-10 | 2018-12-11 | 广西柳钢工程技术有限公司 | The overlaying method and deflection welding tooling of roll mill roller |
| CN109604769A (en) * | 2019-01-07 | 2019-04-12 | 武汉船用机械有限责任公司 | The welding method of annular workpieces |
| CN109973742A (en) * | 2019-01-31 | 2019-07-05 | 武汉船用机械有限责任公司 | The production method of the rotary joint and rotary joint of anchoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109604769A (en) * | 2019-01-07 | 2019-04-12 | 武汉船用机械有限责任公司 | The welding method of annular workpieces |
| CN109604769B (en) * | 2019-01-07 | 2021-11-16 | 武汉船用机械有限责任公司 | Method for welding annular workpiece |
| CN109973742A (en) * | 2019-01-31 | 2019-07-05 | 武汉船用机械有限责任公司 | The production method of the rotary joint and rotary joint of anchoring system |
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| CN104043502B (en) | 2016-02-03 |
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Effective date of registration: 20161201 Address after: 200245 Jiangchuan Road, Shanghai, No. 230, building 1800, No. Patentee after: Shanghai electric heavy milling special equipment Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |