CN101108443A - Installing and soldering technique of inlet, outlet slip ring of large-scale sliding crawler mill barrel - Google Patents

Installing and soldering technique of inlet, outlet slip ring of large-scale sliding crawler mill barrel Download PDF

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Publication number
CN101108443A
CN101108443A CNA2006100484293A CN200610048429A CN101108443A CN 101108443 A CN101108443 A CN 101108443A CN A2006100484293 A CNA2006100484293 A CN A2006100484293A CN 200610048429 A CN200610048429 A CN 200610048429A CN 101108443 A CN101108443 A CN 101108443A
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welding
slip ring
web
weld
arc
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CN100509243C (en
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白金生
段世新
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CITIC Heavy Industries Co Ltd
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ZHONGXIN HEAVY MACHINERY CO
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Abstract

The invention discloses an assembly welding process method for the inlet and outlet slip ring of a large-sized slider shoe mill cylinder. By strict manufacturing, welding and assembling process for a web plate (2) and a slip ring cylinder section (1), as well as controlling the quality in the weld seams and weld deformation in the inlet and outlet slip ring, the geometrical dimensional accuracy and the product quality of the inlet and outlet slip ring of the slider shoe mill cylinder are effectively ensured, and the form and positional tolerances of the web plate (2) and the slip ring cylinder section (1) are guaranteed, and the design requirements are satisfied. In addition, for the method, the operability is high and the production cost is low.

Description

The assembling and welding process method of large-sized slide grinding cylinder import and export slip ring
Technical field:
The present invention relates to large-sized slide mill cylindrical shell equipment manufacturing technology field, particularly a kind of assembling and welding process method of large-sized slide grinding cylinder import and export slip ring.
Background technology:
At present, the maximum 5.4M of the sliding crawler mill barrel diameter that China produces, cylindrical shell length is between 13M~17M, and its core, emphasis part, the difficult point of promptly manufacturing are exactly the assembling and the welding of import and export slip ring.And the specification requirement height of import and export slip ring, the form and position tolerance that requires welding to guarantee behind the assembly welding is tight, steel plate thickness of slab, bevel for welding are big, welding deformation is wayward, and all weld seams all require the ultrasonic examination inspection, and difficulty is big during making, particularly owing to welding deformation in the manufacturing process is not easy control, often do not reach designing requirement, and repair that to rectify distortion time-consuming, the production cost height.
Summary of the invention:
In order to solve problems of the prior art, the object of the present invention is to provide a kind of assembling and welding process method of large-sized slide grinding cylinder import and export slip ring, it is made erection welding technology, import and export slip ring weldquality and welding deformation is controlled by adopting strict web, slip ring plate shell ring, thereby guarantees the geometric accuracy and the product quality of sliding crawler mill cylindrical shell import and export slip ring effectively.
In order to realize the foregoing invention purpose, the present invention adopts following technical scheme:
The assembling and welding process method of described large-sized slide grinding cylinder import and export slip ring, its concrete making assembly technology flow process is:
1, adopt numerical control method cutting machine that the blank of web is carried out blanking, web is by two splicings, and cylindrical stays 15mm allowance during blanking, cuts the mill groove, take out of draw, arc extinguishing board.
2, employing Lincoln weld is welded the web of two splicings, and back root cleaning during welding needs in the welding process repeatedly to overturn, the control welding deformation, and postwelding is corrected, and flatness should be not more than 3mm, and butt welded seam carries out the ultrasonic examination inspection by drawing.
3, the web after the welding is marked datum line, be used for, the seam with slip ring plate shell ring is staggered mutually in the reference of when assembling.
4,, even with the fit-up gap that guarantees web and slip ring plate shell ring to the web processing excircles groove after the welding.
5, two of the length directions of slip ring plate shell ring connect material, every end stays 300mm pressure head amount, on flat board, mark datum line and four center lines, adopt semi-automatic gas cutting processing slip ring plate length of cylindrical shell sections direction two ends bevel for welding, and weld with Lincoln weld, during welding spot welding draw, arc extinguishing board, back root cleaning is noted many upsets in the welding process, the control welding deformation, postwelding is corrected, and the postwelding butt welded seam carries out the ultrasonic examination inspection.
6, the slip ring plate shell ring after the welding is heat-treated, promptly soldered is carried out the far infrared stress relief annealing.
7, the side end face to the slip ring plate shell ring after the welding processes as datum level earlier, and marks the position line of assembling web on lathe.20mm allowance is stayed in width dimensions feeding slip-ring left side, and 15mm allowance is stayed in the right side, and 15mm allowance is respectively stayed at discharging slip ring two ends, and holds about marking on the cylinder board.Thereby guarantee the assembly precision of web with respect to slip ring plate shell ring.
8, on the veneer reeling machine to the welding after slip ring plate shell ring carry out pressure head after, and semi-automatic pressure head and the groove of cutting, to carry out round as a ballly again, strict control circularity is not more than 2mm, should check longitudinal seam place circularity especially, carry out the detection at least three places with special cylinder roundness detector.
9, the slip ring plate shell ring that will carry out after round as a ball lies on the mounting plate, requires the mounting plate flatness to be not more than 1mm, at least 8 levelling shell rings of cylindrical, and guarantees that perpendicularity is not more than 1mm with curved chi, rechecks the web position line with tosecan.
10, according to web position line spot welding one location-plate on the position line, location-plate guarantees the right angle, and the blanking limit polishes smooth, put into web according to the datum line that marks on the slip ring plate shell ring, check that with curved chi the web perpendicularity is not more than 2mm in the cylinder inboard wall inspection, the web peripheral clearance evenly is not more than 2mm, positions weldering then.
11, in the web bottom simultaneously to web and slip ring preheating, the preheating of butt welded seam district is welded more than 100 ℃, the Lincoln weld continuous welding is adopted in welding, if any interruption, should be incubated immediately, temperature must not be lower than 100 ℃.Note repeatedly upset in the welding process, control welding deformation, and stay one section stress release section not weld earlier carries out the defect detecting test weld seam then, heat-treats after qualified, and back repair welding, defect detecting test weld seam are once more returned in heat treatment.
12, both ends of the surface, bevel for welding and the weld seam etc. of the web after the process and assemble, slip ring plate shell ring return then, participate in the dress weldering of other sections shell ring.
The assembling and welding process method of described large-sized slide grinding cylinder import and export slip ring, the control method to the import and export weldquality in its assembling process is:
1, riveter adopts the J506 welding rod when the assembling tack welding, and spot welding position 100mm scope domestic demand is carried out preheating, and preheat temperature must be greater than 75 ℃.
2, need and will carry out gas preheating in each 100mm scope of web center line both sides before the electric welding welding, it comprises whole circle welding region, adopts homemade heater, and preheat temperature must be greater than 100 ℃.
3, need to remove oil, rust and other impurity etc. of weld seam periphery before the weldering.
4, used J506 welding rod during the riveter tack welding should carry out the oven dry of 350 ℃ * 1.5h before use, puts into the heat-preservation cylinder ready access upon use after the oven dry.The employed solder flux HJ431 of submerged-arc welding also should carry out the oven dry of 200 ℃ * 1~2h.
5, for guaranteeing the weldquality of web and slip ring plate shell ring junction, narrower at the width of considering slip ring plate shell ring, can't go up under the situation that positioner carries out Lincoln weld, die and submerged arc welding carriage is realized the transformation of rotary feed campaign, to realize the weld seam Lincoln weld of web and slip ring plate shell ring junction.
The assembling and welding process method of described large-sized slide grinding cylinder import and export slip ring, it to the welding deformation control method is:
1, adopts dc reverse connection short arc multi-pass welding, will remove slag, reasonable arc manipulation after weld for every layer, prevent from defectives such as incomplete fusion, undercut, pore to occur, forbid in weldment surface striking, during welding at the interlayer edge, guarantee sequential welding, superficial layer weld seam postwelding will fill up arc crater.Consider web and slip ring shell ring thickness of slab, the reason that constraint (restraint) degree is big, want about 100~150 ℃ of preheatings before the weldering, interlayer temperature is controlled between 100~200 ℃.Weld procedure specification parameter such as following table:
Welding bead or layer Welding method Fill metal Electric current A Arc voltage V Speed of welding mm/min
Classification Diameter Kind or polarity Ampere or wire feed rate
Bottom Submerged-arc welding H08MnA 4mm DCEP 500-550 29-31V 300-350
Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-600 29-32V 300-350
The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-650 32-34V 250-300
Back gouging is to the caulking weld metal, grinder buffing, thoroughly descaling
Bottom Submerged-arc welding H08MnA 4mm DCEP 500-550 29-31V 300-350
Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-600 29-32V 300-350
The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-650 32-34V 250-300
2, should strictly control welding deformation in the welding process, first face welding deformation need overturn when reaching 10mm, welding will be overturn when anti-deformation protrusion 5mm again behind the back chipping, and later deflection is controlled at 3mm and overturns with interior, with its Deformation control within Smith's claimed range.
3, if to have welded the back plane degree overproof for last one weld seam, under the state of riveter Ying Zaire it is repaired, repair qualified after, wait its temperature to reduce to room temperature after, carry out the inspection of butt welded seam again.
4, after the slip ring inspection finishes, before heat-treating, tackle it and doing the flatness inspection, and make record, and with the web convex surface up, then it is heat-treated, again slip ring is done the flatness inspection after the heat treatment, if overproof, should guarantee to avoid adopting flame straightening under the prerequisite of repairing as far as possible.
Because adopt as above-mentioned technical scheme, the present invention has following superiority:
The assembling and welding process method of described large-sized slide grinding cylinder import and export slip ring, the form and position tolerance of having guaranteed web and slip ring plate shell ring meets the demands, and has controlled import and export weldquality and welding deformation effectively, has reached designing requirement, and this technology is workable, and production cost is low.
Description of drawings:
Fig. 1 is the part-structure schematic diagram of large-sized slide grinding cylinder import and export slip ring;
Number in the figure: 1-slip ring plate shell ring; The 2-web.
Specific embodiment:
As shown in Figure 1, the assembling and welding process method of this large-sized slide grinding cylinder import and export slip ring, its concrete making assembly technology flow process is:
1, adopt numerical control method cutting machine motor vehicle that the blank of web is carried out blanking, web (2) is by two splicings, and cylindrical stays 15mm allowance during blanking, cuts the mill groove, take out of draw, arc extinguishing board.
2, employing Lincoln weld is welded the web (2) of two splicings, and back root cleaning during welding needs in the welding process repeatedly to overturn, the control welding deformation, postwelding is corrected, and flatness should be not more than 3mm, and butt welded seam carries out the ultrasonic examination inspection by drawing.
3, the web (2) after the welding is marked datum line, be used for, the seam with slip ring plate shell ring (1) is staggered mutually in the reference of when assembling.
4,, even with the fit-up gap of slip ring plate shell ring (1) to guarantee web (2) to web (2) the processing excircles groove after the welding.
5, two of the length directions of slip ring plate shell ring (1) connect material, every end stays 300mm pressure head amount, on flat board, mark datum line and four center lines, adopt semi-automatic gas cutting processing slip ring plate shell ring (1) length direction two ends bevel for welding, and weld with Lincoln weld, during welding spot welding draw, arc extinguishing board, back root cleaning is noted many upsets in the welding process, the control welding deformation, postwelding is corrected, and the postwelding butt welded seam carries out the ultrasonic examination inspection.
6, the slip ring plate shell ring (1) after the welding is heat-treated, promptly soldered is carried out the far infrared stress relief annealing.
7, the side end face to the slip ring plate shell ring (1) after the welding processes as datum level earlier, and marks the position line of assembling web on lathe.20mm allowance is stayed in width dimensions feeding slip-ring left side, and 15mm allowance is stayed in the right side, and 15mm allowance is respectively stayed at discharging slip ring two ends, and holds about marking on the cylinder board.Thereby guarantee the assembly precision of web (2) with respect to slip ring plate shell ring (1).
8, on the veneer reeling machine to the welding after slip ring plate shell ring (1) carry out pressure head after, and semi-automatic pressure head and the groove of cutting, to carry out round as a ballly again, strict control circularity is not more than 2mm, should check longitudinal seam place circularity especially, carry out the detection at least three places with special cylinder roundness detector.
9, the slip ring plate shell ring (1) that will carry out after round as a ball lies on the mounting plate, requires the mounting plate flatness to be not more than 1mm, at least 8 levelling shell rings of cylindrical, and guarantees that perpendicularity is not more than 1mm with curved chi, rechecks web (2) position line with tosecan.
10, according to web (2) position line spot welding one location-plate on the position line, location-plate guarantees the right angle, and the blanking limit polishes smooth, put into web according to the datum line that marks on the slip ring plate shell ring (1), check that with curved chi web (2) perpendicularity is not more than 2mm in the cylinder inboard wall inspection, web (2) peripheral clearance evenly is not more than 2mm, positions weldering then.
11, in web (2) bottom simultaneously to web and slip ring preheating, the preheating of butt welded seam district is welded more than 100 ℃, the Lincoln weld continuous welding is adopted in welding, if any interruption, should be incubated immediately, temperature must not be lower than 100 ℃.Note repeatedly upset in the welding process, control welding deformation, and stay one section stress release section not weld earlier carries out the defect detecting test weld seam then, heat-treats after qualified, and back repair welding, defect detecting test weld seam are once more returned in heat treatment.
12, both ends of the surface, bevel for welding and the weld seam etc. of the web after the process and assemble (2), slip ring plate shell ring (1) return then, participate in the dress weldering of other sections shell ring.
Control method to the import and export weldquality in its assembling process is:
1, riveter adopts the J506 welding rod when the assembling tack welding, and spot welding position 100mm scope domestic demand is carried out preheating, and preheat temperature must be greater than 75 ℃.
2, need and will carry out gas preheating in each 100mm scope of web (2) center line both sides before the electric welding welding, it comprises whole circle welding region, adopts homemade heater, and preheat temperature must be greater than 100 ℃.
3, need to remove oil, rust and other impurity etc. of weld seam periphery before the weldering.
4, used J506 welding rod during the riveter tack welding should carry out the oven dry of 350 ℃ * 1.5h before use, puts into the heat-preservation cylinder ready access upon use after the oven dry.The employed solder flux HJ431 of submerged-arc welding also should carry out the oven dry of 200 ℃ * 1~2h.
5, for guaranteeing the weldquality of web (2) and slip ring plate shell ring (1) junction, narrower at the width of considering slip ring plate shell ring (1), can't go up under the situation that positioner carries out Lincoln weld, die and submerged arc welding carriage is realized the transformation of rotary feed campaign, to realize the weld seam Lincoln weld of web (2) and slip ring plate shell ring (1) junction.
It to the welding deformation control method is:
1, adopts dc reverse connection short arc multi-pass welding, will remove slag, reasonable arc manipulation after weld for every layer, prevent from defectives such as incomplete fusion, undercut, pore to occur, forbid in weldment surface striking, during welding at the interlayer edge, guarantee sequential welding, superficial layer weld seam postwelding will fill up arc crater.Consider web (2) and slip ring shell ring (1) thickness of slab, the reason that constraint (restraint) degree is big, want about 100~150 ℃ of preheatings before the weldering, interlayer temperature is controlled between 100~200 ℃.Weld procedure specification parameter such as following table:
Welding bead or layer Welding method Fill metal Electric current A Arc voltage V Speed of welding mm/min
Classification Diameter Kind or polarity Ampere or wire feed rate
Bottom Submerged-arc welding H08MnA 4mm DCEP 500-550 29-31V 300-350
Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-600 29-32V 300-350
The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-650 32-34V 250-300
Back gouging is to the caulking weld metal, grinder buffing, thoroughly descaling
Bottom Submerged-arc welding H08MnA 4mm DCEP 500-550 29-31V 300-350
Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-600 29-32V 300-350
The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-650 32-34V 250-300
2, should strictly control welding deformation in the welding process, first face welding deformation need overturn when reaching 10mm, welding will be overturn when anti-deformation protrusion 5mm again behind the back chipping, and later deflection is controlled at 3mm and overturns with interior, with its Deformation control within Smith's claimed range.
3, if to have welded the back plane degree overproof for last one weld seam, under the state of riveter Ying Zaire it is repaired, repair qualified after, wait its temperature to reduce to room temperature after, carry out the inspection of butt welded seam again.
4, after the slip ring inspection finishes, before heat-treating, tackle it and doing the flatness inspection, and make record, and with the web convex surface up, then it is heat-treated, again slip ring is done the flatness inspection after the heat treatment, if overproof, should guarantee to avoid adopting flame straightening under the prerequisite of repairing as far as possible.

Claims (3)

1. the assembling and welding process method of a large-sized slide grinding cylinder import and export slip ring, it is characterized in that: its concrete making assembly technology flow process is:
(1), adopt numerical control cutting machine that the blank of web is carried out blanking, web (2) is by two splicings, cylindrical stays 15mm allowance during blanking, cuts the mill groove, take out of draw, arc extinguishing board.
(2), adopt Lincoln weld that the web (2) of two splicings is welded, back root cleaning during welding needs in the welding process repeatedly to overturn, the control welding deformation, postwelding is corrected, and flatness should be not more than 3mm, and butt welded seam carries out the ultrasonic examination inspection by drawing.
(3), the web (2) after the welding is marked datum line, be used for, the seam with slip ring plate shell ring is staggered mutually in the reference of when assembling.
(4), to web (2) the processing excircles groove after the welding, even to guarantee web (2) with the fit-up gap of slip ring plate shell ring (1).
(5), two of the length directions of slip ring plate shell ring (1) connect material, every end stays 300mm pressure head amount, on flat board, mark datum line and four center lines, adopt semi-automatic gas cutting processing slip ring plate shell ring (1) length direction two ends bevel for welding, and weld with Lincoln weld, during welding spot welding draw, arc extinguishing board, back root cleaning is noted many upsets in the welding process, the control welding deformation, postwelding is corrected, and the postwelding butt welded seam carries out the ultrasonic examination inspection.
(6), to the welding after slip ring plate shell ring (1) heat-treat, promptly soldered is carried out the far infrared stress relief annealing.
(7), to the side end face processing earlier of the slip ring plate shell ring (1) after the welding as datum level, and on lathe, mark the position line of assembling web (2).20mm allowance is stayed in width dimensions feeding slip-ring left side, and 15mm allowance is stayed in the right side, and 15mm allowance is respectively stayed at discharging slip ring two ends, and holds about marking on the cylinder board.Thereby guarantee the assembly precision of web (2) with respect to slip ring plate shell ring (1).
(8), on the veneer reeling machine to the welding after slip ring plate shell ring (1) carry out pressure head after, and semi-automatic pressure head and the groove of cutting, to carry out round as a ballly again, strict control circularity is not more than 2mm, should check longitudinal seam place circularity especially, carry out the detection at least three places with special cylinder roundness detector.
(9), the slip ring plate shell ring (1) that will carry out after round as a ball lies on the mounting plate, requires the mounting plate flatness to be not more than 1mm, at least 8 levelling shell rings of cylindrical, and guarantees that perpendicularity is not more than 1mm with curved chi, rechecks web (2) position line with tosecan.
(10), according to web (2) position line spot welding one location-plate on the position line, location-plate guarantees the right angle, and the blanking limit polishes smooth, put into web (2) according to the datum line that marks on the slip ring plate shell ring (1), check that with curved chi the web perpendicularity is not more than 2mm in the cylinder inboard wall inspection, web (2) peripheral clearance evenly is not more than 2mm, positions weldering then.
(11), in web (2) bottom simultaneously to web and slip ring preheating, the preheating of butt welded seam district is welded more than 100 ℃, the Lincoln weld continuous welding is adopted in welding, if any interruption, should be incubated immediately, temperature must not be lower than 100 ℃.Note repeatedly upset in the welding process, control welding deformation, and stay one section stress release section not weld earlier carries out the defect detecting test weld seam then, heat-treats after qualified, and back repair welding, defect detecting test weld seam are once more returned in heat treatment.
(12), the web (2) after the process and assemble, both ends of the surface, bevel for welding and the weld seam etc. of slip ring plate shell ring (1), return then, participate in the dress weldering of other sections shell ring.
2. the assembling and welding process method of a kind of large-sized slide grinding cylinder import and export slip ring as claimed in claim 1 is characterized in that: the control method to the import and export weldquality in its assembling process is:
(1), riveter adopts the J506 welding rod during tack welding in assembling, spot welding position 100mm scope domestic demand is carried out preheating, preheat temperature must be greater than 75 ℃.
(2), need and to carry out gas preheating in each 100mm scope of web (2) center line both sides before the electric welding welding, it comprises whole circle welding region, adopts homemade heater, and preheat temperature must be greater than 100 ℃.
(3), need to remove oil, rust and other impurity etc. of weld seam periphery before the weldering.
(4), used J506 welding rod during the riveter tack welding, should carry out the oven dry of 350 ℃ * 1.5h before use, put into the heat-preservation cylinder ready access upon use after the oven dry.The employed solder flux HJ431 of submerged-arc welding also should carry out the oven dry of 200 ℃ * 1~2h.
(5), for guaranteeing the weldquality of web (2) and slip ring plate shell ring (1) junction, narrower at the width of considering slip ring plate shell ring (1), can't go up under the situation that positioner carries out Lincoln weld, die and submerged arc welding carriage is realized the transformation of rotary feed campaign, to realize the weld seam Lincoln weld of web and slip ring plate shell ring junction.
3. the assembling and welding process method of a kind of large-sized slide grinding cylinder import and export slip ring as claimed in claim 1, it is characterized in that: it to the welding deformation control method is:
(1), adopt dc reverse connection short arc multi-pass welding, to remove slag, reasonable arc manipulation after weld for every layer, prevent from defectives such as incomplete fusion, undercut, pore to occur, forbid in weldment surface striking, during welding at the interlayer edge, guarantee sequential welding, superficial layer weld seam postwelding will fill up arc crater.Consider web and slip ring shell ring thickness of slab, the reason that constraint (restraint) degree is big, want about 100~150 ℃ of preheatings before the weldering, interlayer temperature is controlled between 100~200 ℃.Weld procedure specification parameter such as following table:
Welding bead or layer Welding method Fill metal Electric current A Arc voltage V Speed of welding mm/min Classification Diameter Kind or polarity Ampere or wire feed rate Bottom Submerged-arc welding H08MnA 4mm DCEP 500-55 0 29-31V 300-350 Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-60 0 29-32V 300-350 The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-65 0 32-34V 250-300 Back gouging is to the caulking weld metal, grinder buffing, thoroughly descaling Bottom Submerged-arc welding H08MnA 4mm DCEP 500-550 29-31V 300-350 Packed layer Submerged-arc welding H08MnA 4mm DCEP 550-600 29-32V 300-350 The capping layer Submerged-arc welding H08MnA 4mm DCEP 600-650 32-34V 250-300
(2), should strictly control welding deformation in the welding process, first face welding deformation need overturn when reaching 10mm, welding will be overturn when anti-deformation protrudes 5mm again behind the back chipping, later deflection is controlled at 3mm and overturns with interior, with its Deformation control within Smith's claimed range.
(3), if to have welded the back plane degree overproof for last one weld seam, under the state of riveter Ying Zaire it is repaired, repair qualified after, wait its temperature to reduce to room temperature after, carry out the inspection of butt welded seam again.
(4), after the slip ring inspection finishes, before heat-treating, tackle it and doing the flatness inspection, and make record, and up with the web convex surface, then it is heat-treated, again slip ring is done the flatness inspection after the heat treatment,, should guarantee to avoid adopting flame straightening under the prerequisite of repairing as far as possible if overproof.
CNB2006100484293A 2006-07-18 2006-07-18 Installing and soldering technique of inlet, outlet slip ring of large-scale sliding crawler mill barrel Active CN100509243C (en)

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CN101941139A (en) * 2010-09-02 2011-01-12 中信重工机械股份有限公司 Welding and assembling method for huge mining mill barrel
CN101941139B (en) * 2010-09-02 2014-02-12 中信重工机械股份有限公司 Welding and assembling method for huge mining mill barrel
CN102168698B (en) * 2011-04-19 2013-06-19 西安煤矿机械有限公司 Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine
CN102168698A (en) * 2011-04-19 2011-08-31 西安煤矿机械有限公司 Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine
CN102363239A (en) * 2011-09-28 2012-02-29 克里特集团有限公司 Automatic narrow-gap submerged arc welding process for all-welded fixed ball valve with medium and large calibers
CN102729014A (en) * 2012-07-06 2012-10-17 洛阳市双勇机器制造有限公司 Technological method for machining wheel body by using vertical lathe
CN102848141A (en) * 2012-08-23 2013-01-02 哈尔滨电机厂有限责任公司 Method for producing inclined vertical rib structure rotor support frame center body of large-scale vertical generator
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CN103170815A (en) * 2013-04-15 2013-06-26 青岛兰石重型机械设备有限公司 Welding process of boss of hydrogenation reactor
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CN103862133B (en) * 2014-04-08 2016-04-27 哈尔滨红光锅炉总厂有限责任公司 A kind of drum welding method
CN104526175A (en) * 2014-12-24 2015-04-22 沈阳航天新星机电有限责任公司 Method for controlling welding deformation
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