CN112548684A - Welding and grinding process for three-side intersection position - Google Patents
Welding and grinding process for three-side intersection position Download PDFInfo
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- CN112548684A CN112548684A CN202010241829.6A CN202010241829A CN112548684A CN 112548684 A CN112548684 A CN 112548684A CN 202010241829 A CN202010241829 A CN 202010241829A CN 112548684 A CN112548684 A CN 112548684A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
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Abstract
The invention discloses a welding and polishing process for three-edge intersection positions, which comprises the following steps of S1, polishing a welding seam of the three-edge intersection position by using a grinding wheel; s2, polishing the weld joint at the three-side intersection position by using a grindstone, wherein in the polishing process, the axial direction of a rotating shaft of the grindstone is perpendicular to the weld joint, and the grindstone is operated to rotate unidirectionally along an O-shaped track; in step S1, the weld at the three-side intersection position includes a length-direction weld and an intersection weld; in step S2, the weld at the three-side intersection includes a length direction weld and an intersection weld. According to the welding and polishing process for the three-edge intersection position, disclosed by the invention, through standardizing the polishing process and the polishing process, the problem of polishing the weld defects at the three-edge intersection position of a welded part is solved, meanwhile, the damage to a base metal and the low working efficiency caused by repeated polishing at the same position are avoided, the repeated welding and repairing condition caused by MT defects in flaw detection is reduced, and the product quality is improved.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding and polishing process for a three-edge intersection position.
Background
With the rapid development of rail transit in China, how to control the production quality on the premise of ensuring the production efficiency becomes the most important problem. And there is a serious production bottleneck in the present automobile body tip chassis is made, just there are many places complicated intersection structures in automobile body sleeper beam inside, there are the welding seam of many three edge intersection positions in EMUs welded frame roof beam and crossbeam, this position space is narrow and small, the welding seam layer is said too much, it is big to polish the degree of difficulty, the welding seam volume of repairing is more, can cause following quality risk:
1. the space is narrow, the welding repair difficulty is high, and the risk of failure of welding repair causes component scrapping;
2. manual repair welding repair is needed, the difficulty of repair welding is high, a large number of consumed materials are needed, and inspection is needed to perform flaw detection, so that excessive economic loss is caused;
3. repair welding causes heat concentration, causes welding deformation of each seat, and requires repeated adjustment and repair.
Chinese patent with application number CN201911014457.7 discloses a method for welding a complex intersection structure of weathering resistant steel sleeper beams, which comprises the following steps: and (2) welding the complex crossed structure of the weathering steel sleeper beam by adopting a double-step lifting and falling method: firstly, carrying out lifting welding at the position of a right welding toe of a welding seam, recording the lifting welding length as L, dropping the welding to a half position of the length L, and then carrying out reflow welding at the intersection of the lifting welding right welding toe and the position of an upper welding toe of the welding seam II to finish one step; and secondly, lifting welding at the left toe position of the welding seam, then welding to half, reflowing to the lower toe position of the welding seam to finish two-step lifting and dropping, and finally continuously welding to finish the whole operation.
Chinese patent with application number CN201510070036.1 discloses a steel member that many welding seams intersect and manufacturing method thereof, mainly including last H shaped steel, lower H shaped steel, left H shaped steel and right H shaped steel, one of them edge of the last flange plate of left side H shaped steel and right H shaped steel links to each other with the last flange plate of lower H shaped steel, and another edge links to each other with the web of lower H shaped steel, the one end of the lower flange plate of left side H shaped steel and right H shaped steel welds with the flange plate of last H shaped steel, the inboard edge of the lower flange plate of left side H shaped steel and right H shaped steel welds with the outside edge of the lower flange plate of lower H shaped steel the outside of left side H shaped steel and right H shaped steel is provided with left side apron and right side apron respectively.
Although the prior art mentioned above proposes related processing of multi-point intersection and weld joints, it does not propose a polishing method capable of standardizing the multi-point intersection and peripheral weld joints, and does not propose related technical solutions in the post-welding processing procedure.
Therefore, it is necessary to improve the defects of the prior art, provide a welding and polishing process for three-edge intersection positions, standardize polishing process, avoid weld defects caused by repeated polishing, avoid damage to base metal and low working efficiency caused by repeated polishing of the same position, reduce repeated welding and repairing conditions caused by MT defects due to flaw detection, and improve product quality.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and to provide a welding and grinding process for three edge junction locations that overcomes or at least partially solves the above problems.
In order to solve the technical problems, the invention adopts the technical scheme that: a welding and polishing process for a three-side intersection position comprises the following steps,
s1, polishing a welding seam at the three-edge intersection position by using a grinding wheel;
and S2, polishing the weld joint at the three-side intersection position by using a grindstone, wherein in the polishing process, the axial direction of a rotating shaft of the grindstone is perpendicular to the weld joint, and the grindstone is operated to rotate unidirectionally along the O-shaped track.
In step S1, the weld at the three-side intersection position includes a length-direction weld and an intersection weld;
further, step S1 includes the steps of,
s101, checking the thicknesses of the welding seams in the length direction and the welding seams at the intersection, comparing the thicknesses with the polishing reserved quantity, and executing the step S102 if the thicknesses of the welding seams in the length direction and the welding seams at the intersection are within the range of the polishing reserved quantity;
s102, respectively drawing polishing ranges on the welding seams in the length direction and the welding seams at the intersection;
s103, carrying out primary grinding and secondary grinding on the welding line in the length direction by using a grinding wheel;
s104, polishing the welding seam at the junction for the third time by using a spiral file;
in one embodiment, in the step S101, the thickness of the polishing allowance is between 2mm and 5mm, and the polishing allowance is reserved to prevent the base material from being damaged in the polishing process, so that a better buffer space is provided in the polishing process.
Further, in step S103, when polishing the length direction welding seam, the grinding wheel piece rotates around the polishing area in a single direction, and one-way feeding polishing is carried out along the length direction of the three-side intersection position, and the polishing of the length direction welding seam is in a fish scale shape in a single direction, particularly, the fish scale shape is adopted for polishing, namely, the polishing of one-way rotation is carried out at one position, so that the welding seam can be fully polished by the grinding wheel piece, the one-way feeding is ensured, and the welding seam damage caused by repeatedly polishing the same position is avoided.
Further, the step S103 includes the steps of,
step S1031, polishing the welding seam for the first time along the length direction, keeping the thickness of the polished welding seam in the length direction above a first polishing allowance, and quickly processing the length direction of the welding seam, namely performing coarse grinding to polish off welding materials on the surface of the welding seam;
s1032, polishing the welding seam for the second time along the length direction on the basis of the first polishing, keeping the thickness of the polished welding seam in the length direction above a second polishing allowance, finely polishing the length direction of the welding seam, and performing primary polishing treatment on the welding seam;
further, in the step S104, a spiral file is used to perform a third grinding on the welding seams at the intersection to eliminate the defects and the fusion lines inside the welding seams at the intersection, because the space at the intersection is small, the grinding wheel cannot grind the position, and the spiral file well avoids the problem and can also eliminate the fusion lines at the intersection of the welding seams in the length direction;
further, in the step S104, the thickness of the weld joint at the junction after polishing is kept above a second polishing allowance;
further, in step S104, the spiral file is perpendicular to the surface of the weld at the junction and rotates unidirectionally around the grinding region.
In one embodiment, in the step S1031, the thickness of the first polishing margin is between 0.8mm and 1.2 mm;
in one embodiment, in step S1031, the size of the grinding wheel piece used in the first grinding is between phi 150mm and phi 200 mm.
In one embodiment, in the step S1032, the thickness of the second sanding margin is between 0.3mm and 0.8 mm;
in one embodiment, in step S1032, the size of the grinding wheel used for the second grinding is between + 100mm and + 140 mm.
Meanwhile, in step S2, the weld at the three-side intersection position includes a length direction weld and an intersection weld;
further, the step S2 includes the steps of,
step S201, polishing the welding seams in the length direction and the welding seams at the intersection for the fourth time by using the grindstone, and polishing the welding seams in the length direction and the welding seams at the intersection by using the grindstone to eliminate the problem of surface defects of the welding seams caused by grinding wheels and spiral files;
s202, polishing the welding seam in the length direction and the peripheral area of the welding seam at the intersection for the fifth time by using the grindstone for correcting the polishing direction of the welding seam and the transition between the polishing area and the non-polishing area, and performing transition treatment on the welding seam in the length direction and the peripheral area of the welding seam at the intersection by using the grindstone to enable the welding seam to be smoothly transited with the adjacent peripheral parent metal and eliminate the defects and possible stress at the transition;
and S203, flaw detection is carried out on the polished welding seam area, if flaw detection defects exist, the step S201 is executed, and if flaw detection defects do not exist, the welding seam area is qualified.
Further, in the step S201, when the weld in the length direction is polished, the rotation axis of the grinding stone is axially perpendicular to the surface of the weld in the length direction, the grinding stone is operated to rotate along the O-shaped track in a single direction, and the grinding stone is fed in a single direction along the length direction, specifically, the vertical grinding method can avoid irregular shape of the surface of the weld caused by inclined grinding, and can also directly eliminate the defect of residual weld surface, so that the weld is polished smoothly, and the feeding amount is noted in the polishing process, so that the feeding amount can be measured by using a plug gauge, and the phenomenon that the parent metal is damaged is avoided;
when the welding seams at the intersections are polished, the grinding stones abut against the surfaces of the welding seams at the intersections and rotate on the surfaces of the welding seams at the intersections in a one-way mode, so that the welding seams at the intersections are polished, specifically, the irregular shape of the surfaces of the welding seams caused by oblique polishing can be avoided by adopting a vertical polishing method, the residual defect on the surfaces of the welding seams can be directly eliminated, the welding seams are polished smoothly, the feeding amount is noticed in the polishing process, the feeding amount can be measured by using a plug gauge, and the phenomenon that a base metal is damaged is avoided;
in one embodiment, when the weld in the length direction is ground, the grinding stone is transversely arranged above the weld.
Further, in the step S202, when the weld in the length direction is polished, the rotation axis of the grinding stone is axially perpendicular to the surface of the weld in the length direction, the grinding stone is operated to rotate unidirectionally along the O-shaped track, and unidirectional feeding polishing is performed along the length direction and the peripheral region, specifically, the edge of the weld and the adjacent parent metal region can be smoothly transited by adopting a perpendicular polishing method, so that the irregularity of the surface shape of the transition region between the weld and the adjacent parent metal due to oblique polishing is avoided, and the damage to the parent metal is also avoided;
when the welding seam at the intersection is polished, the grinding stone is abutted against the surface of the welding seam at the intersection and rotates in a single direction in the peripheral area of the surface of the welding seam at the intersection, so that the grinding of the intersection and the peripheral welding seam is realized, specifically, the edge of the welding seam and the adjacent parent metal area can be smoothly transited by adopting a vertical grinding method, the irregularity of the surface shape of the transition area between the welding seam and the adjacent parent metal caused by oblique grinding is avoided, and the damage to the parent metal is also avoided;
in one embodiment, when the weld in the length direction is ground, the grinding stone is transversely arranged above the weld.
Further, in step S203, the method for detecting a flaw in the weld area is MT flaw detection, which is used to detect a flaw on the surface of the weld polishing area, and detect a flaw on the surface of the weld of the workpiece by using MT flaw detection, so that the quality of polishing the weld is ensured, and defects existing on the surface of the weld are avoided.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: according to the welding and polishing process for the three-edge intersection position, disclosed by the invention, through standardizing the polishing process and the polishing process, the problem of polishing the weld defects at the three-edge intersection position of a welded part is solved, meanwhile, the damage to a base metal and the low working efficiency caused by repeated polishing at the same position are avoided, the repeated welding and repairing condition caused by MT defects in flaw detection is reduced, and the product quality is improved.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In the drawings:
FIG. 1 is a schematic view of a three-edge-intersection weld of the present invention;
FIG. 2 is a schematic view of the weld grinding process of the present invention.
FIG. 3 is a schematic view of a weld grinding process flow according to an embodiment of the present invention;
fig. 4 is a schematic view of a weld grinding process flow according to another embodiment of the present invention.
In the figure: 1. a length direction; 2. at the junction.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In one embodiment, as shown in fig. 1-2, a three-side-meeting weld grinding process includes the steps of,
s1, polishing a welding seam at the three-edge intersection position by using a grinding wheel;
and S2, polishing the weld joint at the three-side intersection position by using a grindstone, wherein in the polishing process, the axial direction of a rotating shaft of the grindstone is perpendicular to the weld joint, and the grindstone is operated to rotate unidirectionally along the O-shaped track.
In a specific embodiment, as shown in fig. 1 to 4, a three-edge-intersection welding and grinding process, in step S1, the three-edge-intersection welding seam includes a length direction 1 welding seam and an intersection 2 welding seam.
The step S1 includes the steps of,
s101, checking the thicknesses of a welding line 1 in the length direction and a welding line 2 at the intersection, comparing the thicknesses with the polishing reserved quantity, and executing S102 if the thicknesses of the welding line 1 in the length direction and the welding line 2 at the intersection are both in the polishing reserved quantity range;
s102, respectively drawing polishing ranges on a welding line 1 in the length direction and a welding line 2 at an intersection;
s103, carrying out primary grinding and secondary grinding on the welding line in the length direction 1 by using a grinding wheel;
s104, polishing the welding seam at the intersection 2 for the third time by using a spiral file;
in step S101, the thickness of the polishing allowance is between 2mm to 5mm, the polishing allowance is reserved, damage to the base material is prevented in the polishing process, a better buffer space is also provided in the polishing process, and in addition, during welding, a defect is reserved at the welding seam, the thickness of the welding seam is reserved a little, and the defect is also eliminated.
Further, in step S102, polishing ranges of the weld joint in the length direction 1 and the weld joint in the intersection 2 are drawn, a polishing sample plate is used, when the polishing device is used, according to different process requirements, polishing sample plates with different sizes and specifications are adopted, the polishing sample plates are placed in the length direction 1 and the intersection 2 of the weld joint, the polishing ranges are drawn on the weld joint along the polishing ranges on the polishing sample plate, and the next step is executed after the polishing range is drawn.
Further, in step S103, when polishing 1 welding seam of length direction, the grinding wheel rotates around the polishing area in a single direction, and one-way feeding polishing is carried out along 1 length direction of the three-edge intersection position, and polishing of 1 welding seam of length direction is the one-way feeding polishing of fish scale shape, particularly, the fish scale shape is adopted for polishing, and one-way rotating polishing is carried out at a position, so that the welding seam can be fully polished by the grinding wheel, and the one-way feeding is ensured, and the welding seam damage caused by repeatedly polishing the same position is avoided.
Further, the step S103 includes the steps of,
step S1031, polishing the welding seam in the length direction 1 for the first time, keeping the thickness of the welding seam in the length direction 1 after polishing above a first polishing allowance, and performing rapid treatment, namely rough grinding, on the length direction 1 of the welding seam to polish off welding materials on the surface of the welding seam;
s1032, polishing the welding seam in the length direction 1 for the second time on the basis of the first polishing, keeping the thickness of the polished welding seam in the length direction 1 above a second polishing allowance, finely polishing the welding seam in the length direction 1, and performing primary polishing treatment on the welding seam;
further, in the step S104, a spiral file is used to perform a third polishing on the welding line at the intersection 2 for eliminating the defects and the fusion line inside the welding line at the intersection 2, because the space of the intersection 2 is small, the grinding wheel cannot polish the position, and the spiral file well avoids the problem and can also eliminate the fusion line of a plurality of welding lines in the length direction 1 at the intersection 2;
further, in the step S104, the thickness of the weld joint at the intersection 2 after polishing is kept above the second polishing allowance;
further, in step S104, the spiral file is perpendicular to the surface of the weld at junction 2 and rotates unidirectionally around the grinding region.
As a preferable scheme of the present embodiment, in the step S1031, the thickness of the first polishing allowance is between 0.8mm and 1.2mm, and the size of the first polishing allowance is large, so as to ensure that the weld joint is quickly removed during the polishing;
as a preferable scheme of the present embodiment, in the step S1031, the size of the grinding wheel used in the first grinding is between phi 150mm and phi 200mm, and the grinding wheel with a large size can rapidly remove the weld grinding allowance.
As a preferable scheme of this embodiment, in step S1032, the thickness of the second polishing allowance is between 0.3mm and 0.8mm, and the size of the polishing allowance is small, so that the risk of damage to the base material during rapid polishing is reduced, and polishing is also finer;
in a preferred embodiment of the present invention, in step S1032, the size of the grinding wheel used in the second grinding is between phi 100mm and phi 140mm, and the grinding wheel with a smaller size is used to perform fine grinding in the weld length direction 1.
In one embodiment, as shown in fig. 1 to 4, a three-edge-intersection welding and grinding process, in step S2, the three-edge-intersection welding seam includes a length direction 1 welding seam and an intersection 2 welding seam.
The step S2 includes the steps of,
step S201, polishing the weld joint 1 in the length direction and the weld joint 2 at the intersection for the fourth time by using the grindstone, and polishing the weld joint 1 in the length direction and the weld joint 2 at the intersection by using the grindstone to eliminate the problem of weld joint surface defects caused by a grinding wheel and a spiral file;
s202, polishing the weld joint in the length direction 1 and the weld joint peripheral area at the intersection 2 for the fifth time by using the grindstone for correcting the polishing direction of the weld joint and the transition between the polishing area and the non-polishing area, and performing transition treatment on the weld joint in the length direction 1 and the weld joint peripheral area at the intersection 2 by using the grindstone to enable the weld joint and the adjacent peripheral parent metal to be in smooth transition and eliminate the defects and possible stress at the transition;
and S203, flaw detection is carried out on the polished welding seam area, if flaw detection defects exist, the step S201 is executed, and if flaw detection defects do not exist, the welding seam area is qualified.
As a preferable mode of the present embodiment, the grindstone used in the first grinding has a size of phi 26x 75.
In a preferred embodiment of the present invention, the grindstone used for the second grinding has a size of phi 10x 15.
In step S201, when a weld in the length direction 1 is ground, the axial direction of the rotation shaft of the grinding stone is perpendicular to the surface of the weld in the length direction 1, the grinding stone is operated to rotate along the O-shaped track in a single direction, and the grinding stone is fed in a single direction along the length direction 1, specifically, the vertical grinding method can avoid irregular shape of the surface of the weld due to inclined grinding, and can also directly eliminate the defect of residual weld surface, so that the weld is ground smoothly, and the feeding amount is noted in the grinding process, so that the feeding amount can be measured by using a plug gauge, and the phenomenon that a base metal is damaged is avoided;
when 2 joints in the intersection are polished, the whetstone butt is on 2 joint surfaces in the intersection, and in the one-way rotation of joint surface in the intersection, realize the polishing to 2 joints in the intersection, particularly, adopt perpendicular polishing method can avoid polishing the welding seam surface shape irregularity that brings because the slope, can also directly eliminate the remaining defect in welding seam surface simultaneously, make the welding seam polish the rounding off, the in-process of polishing simultaneously is noticed the feed volume, can use the feeler gauge to measure the feed volume, avoids appearing hindering the phenomenon of mother metal.
As the preferred scheme of this embodiment, when polishing 1 welding seam of length direction, the rubstone is horizontal above the welding seam, specifically, the projection of rubstone in axial direction, the perpendicular to the welding seam, it is unusual, the axial periphery of rubstone, with the welding seam is perpendicular and the butt, it is right to realize polishing of welding seam.
As the preferred scheme of this embodiment, when polishing 1 weld of length direction, the projection of whetstone in axial direction, with 1 weld of length direction collineation, promptly the tip butt of whetstone is perpendicular to 1 weld of length direction.
Further, in the step S202, when the weld joint in the length direction 1 is polished, the rotation axis of the grinding stone is axially perpendicular to the weld joint surface in the length direction 1, the grinding stone is operated to rotate unidirectionally along the O-shaped track, and unidirectional feeding polishing is performed along the length direction 1 and the peripheral region, specifically, the edge of the weld joint and the adjacent base material region can be smoothly transited by adopting a perpendicular polishing method, so that irregularities of the surface shape of the transition region between the weld joint and the adjacent base material due to oblique polishing are avoided, and damage to the base material is also avoided;
when 2 joints in the intersection are polished, the grindstone is abutted to the 2 joint surfaces in the intersection, and the peripheral area of the joint surface is rotated in a single direction, so that polishing of the 2 joints in the intersection and the peripheral weld joint is realized, particularly, the edge of the weld joint and the adjacent parent metal area are smoothly transited by adopting a vertical polishing method, the irregularity of the surface shape of the transition area between the weld joint and the adjacent parent metal caused by inclined polishing is avoided, and the damage to the parent metal is also avoided.
As the preferred scheme of this embodiment, when polishing 1 welding seam of length direction, the rubstone is horizontal above the welding seam, specifically, the projection of rubstone in axial direction, the perpendicular to the welding seam, it is unusual, the axial periphery of rubstone, with the welding seam is perpendicular and the butt, it is right to realize polishing of welding seam.
As the preferred scheme of this embodiment, when polishing 1 weld of length direction, the projection of whetstone in axial direction, with 1 weld of length direction collineation, promptly the tip butt of whetstone is perpendicular to 1 weld of length direction.
Particularly, when polishing 1 welding seam of length direction, the handheld device of installing the whetstone of operating personnel, the rotation axis extension line perpendicular to welding seam of whetstone, can be promptly the surface contact of the most portion of whetstone and welding seam also can be the axial perisporium of whetstone and the surface contact of welding seam, operating personnel are O shape orbit and rotate the device of installing the whetstone, whetstone self also rotates, works as the pivoted when whetstone contacts the welding seam surface, realizes polishing of welding seam, specifically is the most portion contact weld seam surface of whetstone still is the perisporium contact weld seam surface of whetstone axis, can select according to the peripheral space of welding seam and particular case.
When polishing 2 welding seams in intersection, the handheld device of installing the whetstone of operating personnel, the tip butt of whetstone in the surface of 2 welding seams in intersection, operating personnel is the O-shaped orbit and rotates the device of installing the whetstone, whetstone self also rotates, when the pivoted when the sharp portion of whetstone contacts the welding seam surface, realizes polishing of welding seam.
Further, in step S203, the method for detecting a flaw in the weld area is MT flaw detection, which is used to detect a flaw on the surface of the weld polishing area, and detect a flaw on the surface of the weld on the workpiece surface by using MT flaw detection, so that the quality of polishing the weld is ensured, and defects existing on the surface of the weld are avoided.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are also meant to be within the scope of the invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use the combination according to the known technical solutions and technical problems to be solved by the present application.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a trilateral intersection position's welding polishing process which characterized in that: comprises the following steps of (a) carrying out,
s1, polishing a welding seam at the three-edge intersection position by using a grinding wheel;
and S2, polishing the weld joint at the three-side intersection position by using a grindstone, wherein in the polishing process, the axial direction of a rotating shaft of the grindstone is perpendicular to the weld joint, and the grindstone is operated to rotate unidirectionally along the O-shaped track.
2. The welding and grinding process for the three-side intersection position according to claim 1, wherein the three-side intersection position comprises the following steps:
in the step S1, the weld at the three-side intersection position includes a length direction (1) weld and an intersection (2) weld;
preferably, step S1 includes the steps of,
s101, checking the thicknesses of a welding seam in the length direction (1) and a welding seam at the intersection (2), comparing the thicknesses with a polishing reserved quantity, and executing a step S102 if the thicknesses of the welding seam in the length direction (1) and the welding seam at the intersection (2) are within the polishing reserved quantity range;
s102, respectively drawing polishing ranges on a welding seam (1) and a welding seam at an intersection (2) in the length direction;
s103, carrying out primary grinding and secondary grinding on the welding line in the length direction (1) by using a grinding wheel;
s104, polishing the welding seam at the intersection (2) for the third time by using a spiral file;
preferably, in step S101, the thickness of the grinding allowance is between 2mm and 5 mm.
3. The welding and grinding process for the three-side intersection position according to claim 2, wherein the three-side intersection position comprises the following steps: in the step S103, when the welding seam in the length direction (1) is polished, the grinding wheel rotates around the polishing area in a single direction, and the grinding wheel performs single-direction feeding polishing along the length direction (1) of the intersection position of the three sides.
4. The welding and grinding process for the three-side intersection position according to claim 3, wherein the three-side intersection position comprises the following steps:
the step S103 includes the steps of,
step S1031, polishing the welding seam in the length direction (1) for the first time, and keeping the thickness of the polished welding seam in the length direction (1) above a first polishing allowance;
s1032, polishing the welding line in the length direction (1) for the second time on the basis of the polishing for the first time, and keeping the thickness of the polished welding line in the length direction (1) above a second polishing allowance;
preferably, in the step S104, a third grinding is performed on the welding seam of the junction (2) by using a spiral file, so as to eliminate defects and a fusion line inside the welding seam of the junction (2);
preferably, in the step S104, the thickness of the weld seam at the polished junction (2) is kept above a second polishing allowance;
preferably, in step S104, the spiral file is perpendicular to the surface of the weld at the junction (2) and rotates unidirectionally around the grinding region.
5. The welding and grinding process for the three-side intersection position according to claim 4, wherein the three-side intersection position comprises the following steps:
in the step S1031, the thickness of the first polishing allowance is between 0.8mm and 1.2 mm;
preferably, in the step S1031, the size of the grinding wheel used for the first grinding is between phi 150mm and phi 200 mm.
6. The welding and grinding process for the three-side intersection position according to claim 4, wherein the three-side intersection position comprises the following steps:
in the step S1032, the thickness of the second polishing margin is between 0.3mm and 0.8 mm;
preferably, in step S1032, the size of the grinding wheel used for the second grinding is between + 100mm and + 140 mm.
7. The welding and grinding process for the three-side intersection position according to any one of claims 1 to 6, wherein:
in the step S2, the weld at the three-side intersection position includes a length direction (1) weld and an intersection (2) weld;
preferably, the step S2 includes the steps of,
s201, polishing the welding line in the length direction (1) and the welding line at the intersection (2) for the fourth time by using the grindstone;
s202, polishing the weld joint in the length direction (1) and the weld joint peripheral area at the intersection (2) for the fifth time by using the grindstone, and correcting the polishing direction of the weld joint and the transition between the polishing area and the non-polishing area;
and S203, flaw detection is carried out on the polished welding seam area, if flaw detection defects exist, the step S201 is executed, and if flaw detection defects do not exist, the welding seam area is qualified.
8. The welding and grinding process for the three-side intersection position according to claim 7, wherein the three-side intersection position comprises the following steps:
in the step S201, when the weld in the length direction (1) is ground, the rotation axis of the grinding stone is axially perpendicular to the weld in the length direction (1), the grinding stone is operated to rotate unidirectionally along the O-shaped track, and unidirectional feeding is performed along the length direction (1);
when the welding seam of the intersection (2) is polished, the grindstone is abutted against the surface of the welding seam of the intersection (2) and rotates in a single direction on the surface of the welding seam of the intersection (2), so that the welding seam of the intersection (2) is polished;
preferably, when the weld joint in the length direction (1) is ground, the grinding stone is transversely arranged above the weld joint.
9. The welding and grinding process for the three-side intersection position according to claim 7, wherein the three-side intersection position comprises the following steps:
in the step S202, when the weld in the length direction (1) is ground, the rotation axis of the grinding stone is axially perpendicular to the weld in the length direction (1), the grinding stone is operated to rotate unidirectionally along the O-shaped track, and unidirectional feeding is performed along the length direction (1) and the peripheral area;
when the weld joint of the intersection (2) is polished, the grindstone is abutted against the surface of the weld joint of the intersection (2) and rotates in a single direction in the peripheral area of the surface of the weld joint of the intersection (2), so that the intersection (2) and the peripheral weld joint are polished;
preferably, when the weld joint in the length direction (1) is ground, the grinding stone is transversely arranged above the weld joint.
10. The welding and grinding process for the three-side intersection position according to claim 7, wherein the three-side intersection position comprises the following steps: in step S203, the method for performing flaw detection on the weld area is MT flaw detection, which is used to perform flaw detection on the surface of the weld grinding area.
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