CN102873631B - Deformation eliminating method of welded ultrahigh pressure pipe - Google Patents
Deformation eliminating method of welded ultrahigh pressure pipe Download PDFInfo
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- CN102873631B CN102873631B CN201210405194.4A CN201210405194A CN102873631B CN 102873631 B CN102873631 B CN 102873631B CN 201210405194 A CN201210405194 A CN 201210405194A CN 102873631 B CN102873631 B CN 102873631B
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Abstract
The invention discloses a deformation eliminating method of a welded ultrahigh pressure pipe. The deformation eliminating method includes the steps of grinding preparation, measuring, building of a reference point, colouring, coarse grinding, facing up, fine grinding, polishing and quality acceptance. The deformation eliminating method has the beneficial effects of economic benefit, time benefit and quality: for example, 30 working hours are consumed for four grinding groups of tongmen and one labor pool group to finish the task of eliminating the deformations of 22 pieces of ultrahigh pressure pipes through grinding, wherein each grinding group comprises two tongmen, and the labor pool group includes four persons who work for 2.5 days and are responsible for assembling and dismantling operations. If the deformation elimination operation is done by a large grinder and a giant flat truck used for turnaround instead of being done through grinding by tongmen, the cost is substantial and a large quantity of time is needed. If the deformation elimination operation is done through grinding by tongmen, the operation can be done at site and only takes 18 working hours. The deformation eliminating method saves work period and reduces the cost of the project, and the pipe can pass the inspection at the first time after being mounted.
Description
Technical field
The present invention relates to the distortion defect elimination method after ultra-high pressure pipeline welding, specifically refer to and utilize pincers worker to grind step by step to eliminate the method for being out of shape after ultra-high pressure pipeline welding.
Background technology
Hydraulic system is the core of its control system, and the making of ultra-high pressure pipeline and installation are the key points that hydraulic system is installed.This hydraulic system has adopted at present state-of-the-art pump control techniques in the world, and its nucleus equipment is 30 compress cells that U.S. Oilgear company provides.Every compress cell is by two plunger displacement pumps, and a deck valve platform and a booster form, the flow 606L/min of every pump, the flow 510L/min of booster.This hydraulic system working pressure 630bar, experimental pressure 700bar, e-quipment and pipe is installed the U.S. ASME standard of carrying out.Because of equipment high-pressure outlet, take over and be connected with booster, the sealing ring that has flexible material in booster, device temperature is changed and has strict requirement, before welding process requirement pipeline weldering because of high press fit pipe, want preheating, postwelding to anneal again, variations in temperature is too large, so the welding process of pipeline does not allow to carry out when with equipment connection.Controlling welding deformation itself is exactly technological difficulties of building peace industry, due to the particularity of this hydraulic system, how the welding deformation of ultra-high pressure pipeline is control effectively and just becomes the great technical barrier that we must capture again.
The deformation analysis of ultra-high pressure pipeline: due to equipment and technology documentation requirements, when equipment contacts with weldment, device temperature can not be over 93 ℃.Requirement according to the welding procedure of ultra-high pressure pipeline to temperature, pipeline preheating, annealing temperature and welding temperature will have influence on equipment.Ultra-high pressure pipeline group on compress cell and contiguous block, to after in place, at the bottom of each weld bond is only beaten one deck, then pulled down pipeline and is carried out welding operation.Because the duration is nervous, 30 ultra-high pressure pipelines all have again individual difference, do not have general character, just not free and condition welding again after 30 positioning tools of processing and fabricating.Pipeline welds in free state, and welding deformation is just uncontrollable.Because pipeline only has 2565mm high, radius of the radian is 514mm only, horizontal range 616mm, pipeline wall thickness reaches 30mm, material is 30CrMo, and the rigidity of this pipeline is higher, and pretension bolt is controlled by pretightning force again, its amount of plastic deformation very limited just during pipe laying, it is defective that this has just caused 22 ultra-high pressure pipelines that fastening rear sealing surface inspections of quality are installed.
Eliminate the method for ultra-high pressure pipeline defect:
When finding defect, the peak period of back of pipeline dress, in order to reach the specification requirement of layout design, meets the node of construction period just, and we have tentatively considered several defect elimination schemes.
1, strengthen the defect elimination method of pretension bolt pretightning force:
Pretension bolt specification M30 * 3.5, material 40CrNiMO, 12.9 grades of ranks.According to design, bolt is under the operating mode of 700bar, and bolt maximum load 304.1KN, reaches 57% of its yield strength, and the stretching resistance that pretension bolt is subject to is in the scope of its safety coefficient.Eliminate the gap of sealing surface, can increase the operating pressure of stretcher, strengthen the pretightning force of pretension bolt, but can cause like this pretension bolt in unsafe state, moreover the ultra-high pressure pipeline that some gaps are larger, its deflection does not still reach requirement, so the method is infeasible.
2 thermal recalibration defect elimination methods:
The pipeline that returns dress has been through oil flushing, inner cleanliness factor reaches the certified products of NAS4～NAS6 level, hydraulic system operation (comprising oil flushing) all adopts shell to obtain man of great strength S2 M46 antiwear hydraulic oil, its flash-point is at 200 ~ 230 ℃, in storing use, forbid oil product to be heated to its flash-point, the maximum temperature of heating, generally should be lower than 20 ~ 30 ℃ of flash-points.If adopted, the method for pipeline local heat is proofreaied and correct, its heating-up temperature can be lower than 400 ~ 500 ℃, and the hydraulic oil carbonization of can burning consequently directly affects the cleanliness factor of pipe interior, causes system cleanliness factor defective, so the method is also infeasible.
3 cold sizing defect elimination methods:
Cold sizing need to be made frock, by the effect of external pressure, changes the shape of pipeline.But the method is consuming time, can not meet the requirement of construction period, so be also denied.
Summary of the invention
The object of the invention is to select a kind of fast, effectively, defect elimination method easily: adopt the grinding technics of pincers worker to eliminate ultra-high pressure pipeline defect, to solve the problem on deformation after ultra-high pressure pipeline welding; The method cost is low, and the work period is short, and eliminating deformation is respond well.
Implementation of the present invention is as follows: the distortion defect elimination method after ultra-high pressure pipeline welding, comprise the steps,
A, measurement: first by ultra-high pressure pipeline installation in position, structure after ultra-high pressure pipeline is installed comprises booster (1), check valve (2), the ultra-high pressure pipeline (3) connecting successively, described ultra-high pressure pipeline (3) is connected with square flange (31), described square flange (31) is provided with the pretension bolt (32) that runs through square flange (31), and described pretension bolt (32) one end is connected with booster (1); Then rotate pretension bolt (32) and carry out pretension operation; Gap between check valve (2) and booster (1) is a, and the gap between check valve (2) and ultra-high pressure pipeline (3) is b, measures the value of (a+b); When (a+b) > 0.05mm is defective, then underproofly ultra-high pressure pipeline is out of shape to defect elimination processes;
B, distortion defect elimination treatment step: when (a+b) > 1.0mm, first carry out grinding machine distortion defect elimination and process, then carry out pincers worker grinding distortion defect elimination and process; When (a+b)≤1.0mm, directly carry out pincers worker and grind the processing of distortion defect elimination.
Pincers worker is ground the processing of distortion defect elimination and is comprised the steps:
A, set up datum mark:
Comprise datum mark annotation step: ultra-high pressure pipeline (3) is the face that needs grinding, i.e. sealing surface near the one side of check valve (2); Sealing surface is divided into at least 4 parts, adopt clearance gauge to check the gap between check valve (2) and ultra-high pressure pipeline (3), draw the position in maximum gap, and mark maximum gap value X, in position, maximum gap, first draw the square place of 20mm * 20mm size, to set up the first datum mark, take the first datum mark as datum mark, turn clockwise 180 ° and locate to set up the second datum mark, then take the first datum mark as datum mark, turn clockwise 90 ° and locate to set up the 3rd datum mark, take the second datum mark as datum mark, turn clockwise 90 ° and locate to set up the 4th datum mark; Adopt the gap of clearance gauge inspection the 3rd datum mark and mark its gap value Y, adopt the gap of clearance gauge inspection the 4th datum mark and mark its gap value Z, the stock removal that simultaneously marks out the second datum mark is X, and the stock removal of the 3rd datum mark is Z, and the stock removal of the 4th datum mark is Y;
Also comprise that datum mark wears down step: when the larger datum mark of stock removal is ground, disappear while processing, first adopt angle grinding machine to carry out grinding process, in the process of grinding process, use at any time edge of a knife chi and clearance gauge to carry out light gap method measurement, draw the amount that mill disappears and, and calculate the amount that also mill does not disappear and; When also mill disappear the amount fallen within the scope of 0.20 mm ~ 0.40mm, adopt again scraper to carry out scraping processing, use scraper once to grind and wipe 0.02 mm-0.08mm off, and then measure, with scraper, grind and wipe 0.02 mm-0.08mm off again, repeatedly like this, gradually datum mark is ground and scrapes measured value, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position; When the less datum mark of stock removal is ground, disappear while processing, directly use scraper to grind and scrape processing, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position;
B, painted: getting the allotment of red lead powder and machine oil, to be evenly prepared into red lead standby, and sealing surface is first wiped clean, and gets red lead and be applied to equably the second datum mark, the 3rd datum mark, the 4th datum mark;
C, corase grind: after the second datum mark, the 3rd datum mark, the 4th datum mark are all painted, hand-held electric angle grinder and sealing surface are 15 ° ~ 20 °, make flap wheel to same direction, do rectilinear motion in uncoloured region, then do again rectilinear motion with former direction direction at an angle of 90, so back and forth, after being maintained an equal level, uncoloured region and the second datum mark stop corase grind operation;
D, to grinding:
Get dressing plate and wipe clean, get red lead and be coated in uniformly on the sealing surface after corase grind;
Dressing plate is leaned against on painted sealing surface, by external force, dressing plate is done to rectilinear motion up and down, make dressing plate and the mutual friction of sealing surface phase, back and forth dressing plate is removed several times later;
Check contact situation, contact situation has following several situation: sealing surface has chilli oil point, has stain, has the bright spots of being, and is infected with in addition the place that chilli oil place was not moved;
Be infected with the place that chilli oil place was not moved, show that dressing plate does not contact with sealing surface, surface gap is larger; There is chilli oil point, show that sealing surface does not contact with dressing plate, but gap is less, has approached datum mark, during grinding, need to carry out fine grinding or some mill; Have stain to show that stain position is higher than chilli oil point position, need to roughly grind, it is the heaviest that bright spot shows that sealing surface contacts with dressing plate, and namely highest point, need roughly grind energetically;
E, fine grinding: according to checking contact situation, stain and bright spot place are carried out to fine grinding operation, after fine grinding, again carry out grinding operation, back and forth, after sealing surface large-area displays bright spot and bright spot are evenly distributed, stop fine grinding, then carry out next step operation;
F, polishing: sealing surface is done to polishing.
The concrete grammar of sealing surface being done to polishing is: use the flat surface abrasive cloth wheel used, polished, open switch, strength wants light on hand, by the placement parallel with sealing surface of flap wheel plane, and contact completely, allow the flap wheel of High Rotation Speed move in a circle in the same direction on sealing surface, rotate after several weeks.
Because the sealing means between ultra-high pressure pipeline and check valve is end face seal, seal is the sealing ring of φ 84.5mm.Assemble in place after, the decrement of sealing ring is 0.5mm, its key that can bear super-pressure is that the pretightning force of roughness, cleanliness factor and the pretension bolt of sealing surface guarantees.Pincers worker grinding, Technology for Scraping are not subject to the restriction of construction site, and the parts after grinding can reach the specification requirement of the roughness 0.8 μ m of layout design, and meet the node requirement of construction period, and these two indexs emphasis of this defect elimination just.By the data value of measuring,
Through field assay: the stock removal that need to be ground from 0.06 ~ 3.5mm not etc., be eliminated sealing surface artificially by gap, the gapped plane of symmetry of sealing surface need to be ground away to the gap value of measurement.Because needing the face relative datum face of grinding, be parallel, can become an inclined-plane after grinding, stock removal at 1.0mm with interior ultra-high pressure pipeline, because of stock removal very little, pipeline forms irregular, the workload of upper grinding machine levelling capturing is very large.After it has been decided through consideration: the grinding technics that the pipeline of measured value (a+b) <1.0mm is used to pincers worker at the scene with compress cell facing-up, the ultra-high pressure pipeline of this type has 16.The pipeline of measured value (a+b) >1.0mm is first gone up to grinding machine, by grinding machine, the gapped plane of symmetry is ground away to grinding gap value, and then transport on-the-spot grinding technics and the compress cell facing-up that uses pincers worker, totally 6 of the ultra-high pressure pipelines of this type back.
Ginding process and explanation.
1, grind work facility, material preparation.
2, DATA REASONING:
By after pressure piping installation in position, according to the specification requirement of construction drawing, the pretension bolt on square flange is carried out to pretension.After bolted completes, check the gap of sealing surface with clearance gauge, the contact-making surface that ultra-high pressure pipeline lower end is connected with contiguous block all can reach 0.05mm clearance gauge can not be filled in, and upper end exports with compress cell super-pressure the contact-making surface being connected and just gone wrong.Check valve is to be clipped between the outlet and ultra-high pressure pipeline sealing surface of booster, has all found the existence in gap at two end faces of check valve, (a+b) more than >0.05mm, is judged to be defective.By the average subregion of the cylindrical of defective adapter contact-making surface, little because of the outside diameter of sealing surface, be only 157mm, can be divided into the sector region of 4 90 ° by taking over contact-making surface, use the clearance gauge inspection of 150mm, check result is labeled in and takes over side, or picture makes a record.
3, grind the establishment of datum mark:
According to measurement data, the gapped opposite of sealing surface is first drawn to the square place of 20mm * 20mm size, with edge of a knife chi, come on sealing surface and use clearance gauge to measure, the sealing surface that removal amount is larger can first be used the grinding energetically of angle grinding machine, in the middle of grinding process, use at any time edge of a knife chi and clearance gauge to measure, control stock removal and can not surpass measured value, when also remaining 0.20 ~ 0.40mm left and right, with scraper, once grind and wipe 0.05mm off, and then measure, with scraper, grind and wipe 0.05mm off again, gradually datum mark is ground and scrapes measured value by that analogy, to guarantee the accurate and reliable of datum mark height, reduce accumulated error as far as possible.The sealing surface that removal amount is few can be used edge of a knife chi and clearance gauge to measure, and directly uses scraper to grind and scrapes datum mark.According to 3 one side principles, a sealing surface is set up at least three datum marks according to measurement data.
4, datum mark is painted:
Red lead powder is filtered out to impurity with screen pack, in order to avoid impurity effect grinding effect.The red lead powder having filtered is allocated with machine oil, can not be too rare, can not be too thick, want appropriateness.Dressing plate and sealing surface are first wiped clean, used clean calico to be stained with a little red lead, be applied to equably on datum mark, indelible too thick, very thin one deck.
5, corase grind:
After datum mark is painted, hand-held electric angle grinder and workpiece are 15 ° ~ 20 ° left and right, make flap wheel to same direction, do rectilinear motion in uncoloured region, then do rectilinear motion with former direction direction at an angle of 90 again, several times reciprocal like this, will be gone down by mill in uncoloured region.Use angle grinding machine should not move back and forth, move back and forth and easily on sealing surface, produce groove.
During corase grind, the angle of angle grinding machine and workpiece can suitably diminish, and dynamics can suitably strengthen, and frequency is faster, and stock removal is larger, and corase grind is applicable to large area and grinds.Remove the sealing surface that the amount of cutting is larger, while starting to roughly grind according to the size of gap width, dynamics can be suitably larger, generally roughly grinds several times rear high points and will be pruned, and then dynamics reduces, and a general stock removal can be controlled in 0.02mm ~ 0.03mm.What corase grind was mainly grasped is the dynamics on hand of angle grinding machine and workpiece and the frequency of grinding, and angle is less, and stock removal is larger; Dynamics is larger, and stock removal is larger.
6, the facing-up of sealing surface:
After corase grind, by the colorize method of datum mark, sealing surface is painted.Dressing plate is leaned against on painted sealing surface, by external force, dressing plate is done to rectilinear motion up and down, make two contact-making surface phase mutual friction, back and forth dressing plate is removed several times, check contact situation later.Will find that sealing surface has chilli oil point, has stain, has the bright spots of being, and is infected with the place that chilli oil place was not moved in addition.Be infected with the place that chilli oil place was not moved, show that flat board does not contact with sealing surface, and gap be larger, is generally the residing position of datum mark.There is chilli oil point, show that sealing surface does not contact with dull and stereotyped, but gap is less, has approached datum mark, during grinding, need fine grinding or some mill.Have stain to show that it is higher than chilli oil point, can roughly grind, it is the heaviest that bright spot shows that sealing surface contacts with dressing plate, and highest point namely can be more energetically during corase grind.
7, fine grinding:
Fine grinding is generally also named and is chosen a little, and sealing surface is after corase grind, and its plane has shown point substantially, but it is less to count, and now uses angle grinding machine to grind bright spot.During fine grinding, dynamics is generally micro-power, and grinding frequency is generally ground at point per second.Grinding frequency is low, and pressure is little, can not cause the fever phenomenon of workpiece.After some mill, by sealing surface and dressing plate facing-up again, after aobvious point, reuse fine grinding method, after circulation repeatedly, the contact-making surface of sealing surface will large-arealy evenly show point.
8, polishing:
Through corase grind, after fine grinding, the aobvious point that sealing surface will Large-Area-Uniform.In order to meet the requirement of layout design to roughness, will do polishing to sealing surface.Use the flat surface abrasive cloth wheel used, polished, open switch, strength wants light on hand, by the placement parallel with sealing surface of flap wheel plane, and contact completely, allow the flap wheel of High Rotation Speed move in a circle in the same direction on sealing surface, rotate after several weeks, polishing scratch on sealing surface will be worn away, and it is very bright that surface just becomes.
：
Measurement should be kept properly with clearance gauge, after using, should will after its wiped clean, preserve at every turn.During measurement, be that whose measurement who grinds in principle, to guarantee the accurate of data, handing-over link in the middle of reducing.
Ultra-high pressure pipeline sealing surface after grinding, polishing, the inspection to roughness, scene does not have accurate instrument, just by rule of thumb, sees vestige, bright degree that sealing surface grinds, and it is rough that light is experienced in hand touch.Veteran Quality People of in-situ determination, is responsible for the quality examination of each procedure.
Hydraulic system of press pipe interior cleanliness factor requires very high, reaches NAS4～NAS6 level, in the defect elimination construction of ultra-high pressure pipeline, note the protection work to system finished product.Before ultra-high pressure pipeline is removed, surrounding enviroment must be cleaned out.After ultra-high pressure pipeline is removed, all exposed mouths of pipe must seal firmly, and the part removing must be placed on calico, and wraps with cloth, avoid polluting as far as possible.For the sealing surface one end mouth of pipe need grinding, silk plug is real, in order to avoid impurity and iron filings are fallen in ultra-high pressure pipeline while grinding.After grinding completes, before time dress, sealing surface and the mouth of pipe, part, instrument use face are stained with and are cleaned out, guarantee that the cleanliness factor of system is unaffected.
The grinding technics of pincers worker because of convenient, fast, safe, effective, is used widely in high pressure and the ultra-high pressure pipeline of hydraulic system of press are made, installed.As curved in the "door" type in master cylinder high-voltage tube pipe arrangement, the "door" type of the high press fit pipe of perforation cylinder is curved, because acid solution after pickling is not rinsed well, the curved long storage time of "door" type, pickling Liquid Residue flows out and high-voltage tube sealing surface is corroded from the mouth of pipe, the end face cut of the perforation high press fit pipe welding deformation of kicker cylinder and kicker cylinder oil-in, and pressure piping and ultra-high pressure pipeline are damaged because of carelessness in transportation, lifting, in installing or the defect elimination of scuffing etc. is processed.
Beneficial effect of the present invention is: comprise economic benefit and time benefit and quality, as: 22 ultra-high pressure pipelines are used pincers worker grinding technics defect elimination, 4 grinding operation groups, two pincers worker of each grinding group, 4 people are responsible for the motor-driven group of dismounting, 2.5 days consuming time, shared and just completed defect elimination task 30 working days.13.36 meters of the curved length of "door" type in master cylinder high-voltage tube pipe arrangement, wide 5.5 meters, 8.5 tons of weight, amount to 4; 13.05 meters of the curved length of "door" type of the high press fit pipe of perforation cylinder, wide 5.6 meters, 10.07 tons of weight, one; If its defect elimination without pincers worker grinding technics, needs large-scale grinding machine and iant flat truck transition, its expense will be considerable, and needs a large amount of time.And adopt pincers worker grinding technics only to need at the scene, share and just completed defect elimination task 18 man-hours.For project management department has saved the duration, reduced the direct cost of project, pipeline is installed the rear disposable check of passing through super-pressure pressure experiment, has guaranteed the node time of the thermic load test run of press.
Accompanying drawing explanation
Fig. 1 is the structural representation after ultra-high pressure pipeline installation in position.
Gap mark figure after Fig. 2 datum mark is measured.
Fig. 3 datum mark stock removal mark figure schematic diagram.
Fig. 4 schematic flow sheet of the present invention.
Label in figure is expressed as: 1, booster; 2, check valve; 3, ultra-high pressure pipeline; 31, square flange; 32, pretension bolt.
The specific embodiment
Embodiment mono-
As shown in Figure 1,2,3, 4.
For 30 ultra-high pressure pipelines of random inspection, the present invention processes according to the following step.
Distortion defect elimination method after ultra-high pressure pipeline welding, comprises the steps,
A, measurement: first by ultra-high pressure pipeline installation in position, structure after ultra-high pressure pipeline is installed comprises booster (1), check valve (2), the ultra-high pressure pipeline (3) connecting successively, described ultra-high pressure pipeline (3) is connected with square flange (31), described square flange (31) is provided with the pretension bolt (32) that runs through square flange (31), and described pretension bolt (32) one end is connected with booster (1); Then rotate pretension bolt (32) and carry out pretension operation; Gap between check valve (2) and booster (1) is a, and the gap between check valve (2) and ultra-high pressure pipeline (3) is b, measures the value of (a+b); When (a+b) > 0.05mm is defective, then underproofly ultra-high pressure pipeline is out of shape to defect elimination processes;
B, distortion defect elimination treatment step: when (a+b) > 1.0mm, first carry out grinding machine distortion defect elimination and process, then carry out pincers worker grinding distortion defect elimination and process; When (a+b)≤1.0mm, directly carry out pincers worker and grind the processing of distortion defect elimination.
For 30 ultra-high pressure pipelines, through measuring, wherein there are 6 needs first to carry out grinding machine distortion defect elimination and process, then carry out pincers worker grinding distortion defect elimination and process; 16 needs directly carry out pincers worker and grind the processing of distortion defect elimination.
Pincers worker is ground the processing of distortion defect elimination and is comprised the steps:
B, set up datum mark:
Comprise datum mark annotation step: ultra-high pressure pipeline (3) is the face that needs grinding, i.e. sealing surface near the one side of check valve (2), sealing surface is divided into 4 parts, be about to sealing surface and be divided into the sector region of 4 90 °, adopt clearance gauge to check the gap between check valve (2) and ultra-high pressure pipeline (3), draw the position in maximum gap, and mark maximum gap value 0.88mm, in position, maximum gap, first draw the square place of 20mm * 20mm size, to set up the first datum mark, take the first datum mark as datum mark, turn clockwise 180 ° and locate to set up the second datum mark, through measuring, the gap width of the second datum mark is 0, then take the first datum mark as datum mark, turn clockwise 90 ° and locate to set up the 3rd datum mark, take the second datum mark as datum mark, turn clockwise 90 ° and locate to set up the 4th datum mark, adopt the gap of clearance gauge inspection the 3rd datum mark and mark its gap value 0.40mm, adopt the gap of clearance gauge inspection the 4th datum mark and mark its gap value 0.50mm, the stock removal that simultaneously marks out the second datum mark is 0.88mm, the stock removal of the 3rd datum mark is 0.50mm, and the stock removal of the 4th datum mark is 0.40mm,
Also comprise that datum mark wears down step: when the larger datum mark of stock removal is ground, disappear while processing, as the second datum mark, first adopt angle grinding machine to carry out grinding process, in the process of grinding process, use at any time edge of a knife chi and clearance gauge to carry out light gap method measurement, draw the amount that mill disappears and, and calculate the amount that also mill does not disappear and; When also mill disappear the amount fallen within the scope of 0.20 mm ~ 0.40mm, adopt again scraper to carry out scraping processing, use scraper once to grind and wipe 0.05mm off, and then measure, with scraper, grind and wipe 0.05mm off again, repeatedly like this, gradually datum mark is ground and scrapes measured value, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position; When the less datum mark of stock removal is ground, disappear while processing, as the 4th datum mark, directly use scraper to grind and scrape processing, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position;
B, painted: getting the allotment of red lead powder and machine oil, to be evenly prepared into red lead standby, and sealing surface is first wiped clean, and gets red lead and be applied to equably the second datum mark, the 3rd datum mark, the 4th datum mark;
C, corase grind: after the second datum mark, the 3rd datum mark, the 4th datum mark are all painted, hand-held electric angle grinder and sealing surface are 15 ° ~ 20 °, make flap wheel to same direction, do rectilinear motion in uncoloured region, then do again rectilinear motion with former direction direction at an angle of 90, so back and forth, after being maintained an equal level, uncoloured region and the second datum mark stop corase grind operation;
Wherein, use angle grinding machine should not move back and forth, move back and forth and easily on sealing surface, produce groove.
During corase grind, the angle of angle grinding machine and workpiece can suitably diminish, and dynamics can suitably strengthen, and frequency is faster, and stock removal is larger, and corase grind is applicable to large area and grinds.Remove the sealing surface that the amount of cutting is larger, while starting to roughly grind according to the size of gap width, dynamics can be suitably larger, generally roughly grinds several times rear high points and will be pruned, and then dynamics reduces, and a general stock removal can be controlled in 0.02mm ~ 0.03mm.What corase grind was mainly grasped is the dynamics on hand of angle grinding machine and workpiece and the frequency of grinding, and angle is less, and stock removal is larger; Dynamics is larger, and stock removal is larger.
D, to grinding:
Get dressing plate and wipe clean, get red lead and be coated in uniformly on the sealing surface after corase grind;
Dressing plate is leaned against on painted sealing surface, by external force, dressing plate is done to rectilinear motion up and down, make dressing plate and the mutual friction of sealing surface phase, back and forth dressing plate is removed several times later;
Check contact situation, contact situation has following several situation: sealing surface has chilli oil point, has stain, has the bright spots of being, and is infected with in addition the place that chilli oil place was not moved;
Be infected with the place that chilli oil place was not moved, show that dressing plate does not contact with sealing surface, surface gap is larger; There is chilli oil point, show that sealing surface does not contact with dressing plate, but gap is less, has approached datum mark, during grinding, need to carry out fine grinding or some mill; Have stain to show that stain position is higher than chilli oil point position, need to roughly grind, it is the heaviest that bright spot shows that sealing surface contacts with dressing plate, and namely highest point, need roughly grind energetically;
E, fine grinding: according to checking contact situation, stain and bright spot place are carried out to fine grinding operation, after fine grinding, again carry out grinding operation, back and forth, after sealing surface large-area displays bright spot and bright spot are evenly distributed, stop fine grinding, then carry out next step operation;
F, polishing: sealing surface is done to polishing.
For the first time when grinding, if bright spot number is few, repeat coarse grinding treatment, otherwise, directly enter fine grinding and process.
As mentioned above, just can realize preferably the present invention.
Claims (2)
1. the distortion defect elimination method after ultra-high pressure pipeline welding, is characterized in that: comprises the steps,
A, measurement: first by ultra-high pressure pipeline installation in position, structure after ultra-high pressure pipeline is installed comprises booster (1), check valve (2), the ultra-high pressure pipeline (3) connecting successively, described ultra-high pressure pipeline (3) is connected with square flange (31), described square flange (31) is provided with the pretension bolt (32) that runs through square flange (31), and described pretension bolt (32) one end is connected with booster (1); Then rotate pretension bolt (32) and carry out pretension operation; Gap between check valve (2) and booster (1) is a, and the gap between check valve (2) and ultra-high pressure pipeline (3) is b, measures the value of (a+b); When (a+b) > 0.05mm is defective, then underproofly ultra-high pressure pipeline is out of shape to defect elimination processes;
B, distortion defect elimination treatment step: when (a+b) > 1.0mm, first carry out grinding machine distortion defect elimination and process, then carry out pincers worker grinding distortion defect elimination and process; When (a+b)≤1.0mm, directly carry out pincers worker and grind the processing of distortion defect elimination;
Pincers worker is ground the processing of distortion defect elimination and is comprised the steps:
Set up datum mark:
Comprise datum mark annotation step: ultra-high pressure pipeline (3) is the face that needs grinding, i.e. sealing surface near the one side of check valve (2); Sealing surface is divided into at least 4 parts, adopt clearance gauge to check the gap between check valve (2) and ultra-high pressure pipeline (3), draw the position in maximum gap, and mark maximum gap value X, in position, maximum gap, first draw the square place of 20mm * 20mm size, to set up the first datum mark, take the first datum mark as datum mark, turn clockwise 180 ° and locate to set up the second datum mark, then take the first datum mark as datum mark, turn clockwise 90 ° and locate to set up the 3rd datum mark, take the second datum mark as datum mark, turn clockwise 90 ° and locate to set up the 4th datum mark; Adopt the gap of clearance gauge inspection the 3rd datum mark and mark its gap value Y, adopt the gap of clearance gauge inspection the 4th datum mark and mark its gap value Z, the stock removal that simultaneously marks out the second datum mark is X, and the stock removal of the 3rd datum mark is Z, and the stock removal of the 4th datum mark is Y;
Also comprise that datum mark wears down step: when the larger datum mark of stock removal is ground, disappear while processing, first adopt angle grinding machine to carry out grinding process, in the process of grinding process, use at any time edge of a knife chi and clearance gauge to carry out light gap method measurement, draw the amount that mill disappears and, and calculate the amount that also mill does not disappear and; When also mill disappear the amount fallen within the scope of 0.20 mm ~ 0.40mm, adopt again scraper to carry out scraping processing, use scraper once to grind and wipe 0.02 mm-0.08mm off, and then measure, with scraper, grind and wipe 0.02 mm-0.08mm off again, repeatedly like this, gradually datum mark is ground and scrapes measured value, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position; When the less datum mark of stock removal is ground, disappear while processing, directly use scraper to grind and scrape processing, when grinding to scrape to the second datum mark, the 3rd datum mark, the 4th datum mark, the first datum mark, stop during all in same plane position;
B, painted: getting the allotment of red lead powder and machine oil, to be evenly prepared into red lead standby, and sealing surface is first wiped clean, and gets red lead and be applied to equably the second datum mark, the 3rd datum mark, the 4th datum mark;
C, corase grind: after the second datum mark, the 3rd datum mark, the 4th datum mark are all painted, hand-held electric angle grinder and sealing surface are 15 ° ~ 20 °, make flap wheel to same direction, do rectilinear motion in uncoloured region, then do again rectilinear motion with former direction direction at an angle of 90, so back and forth, after being maintained an equal level, uncoloured region and the second datum mark stop corase grind operation;
D, to grinding:
Get dressing plate and wipe clean, get red lead and be coated in uniformly on the sealing surface after corase grind;
Dressing plate is leaned against on painted sealing surface, by external force, dressing plate is done to rectilinear motion up and down, make dressing plate and the mutual friction of sealing surface phase, back and forth dressing plate is removed several times later;
Check contact situation, contact situation has following several situation: sealing surface has chilli oil point, has stain, has the bright spots of being, and is infected with in addition the place that chilli oil place was not moved;
Be infected with the place that chilli oil place was not moved, show that dressing plate does not contact with sealing surface, surface gap is larger; There is chilli oil point, show that sealing surface does not contact with dressing plate, but gap is less, has approached datum mark, during grinding, need to carry out fine grinding or some mill; Have stain to show that stain position is higher than chilli oil point position, need to roughly grind, it is the heaviest that bright spot shows that sealing surface contacts with dressing plate, and namely highest point, need roughly grind energetically;
E, fine grinding: according to checking contact situation, stain and bright spot place are carried out to fine grinding operation, after fine grinding, again carry out grinding operation, back and forth, after sealing surface large-area displays bright spot and bright spot are evenly distributed, stop fine grinding, then carry out next step operation;
F, polishing: sealing surface is done to polishing.
2. the distortion defect elimination method after ultra-high pressure pipeline according to claim 1 welding, it is characterized in that: the concrete grammar of sealing surface being done to polishing is: use the flat surface abrasive cloth wheel used, polished, open switch, strength wants light on hand, by the placement parallel with sealing surface of flap wheel plane, and contact completely, allow the flap wheel of High Rotation Speed move in a circle in the same direction on sealing surface, rotate after several weeks.
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| CN201210405194.4A CN102873631B (en) | 2012-10-23 | 2012-10-23 | Deformation eliminating method of welded ultrahigh pressure pipe |
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| CN201210405194.4A CN102873631B (en) | 2012-10-23 | 2012-10-23 | Deformation eliminating method of welded ultrahigh pressure pipe |
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