CN111098078B - Welding positioning method for tail connecting lock of large electric drive vehicle - Google Patents
Welding positioning method for tail connecting lock of large electric drive vehicle Download PDFInfo
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- CN111098078B CN111098078B CN201911335342.8A CN201911335342A CN111098078B CN 111098078 B CN111098078 B CN 111098078B CN 201911335342 A CN201911335342 A CN 201911335342A CN 111098078 B CN111098078 B CN 111098078B
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- positioning device
- connecting lock
- welding
- support lug
- vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
Abstract
The invention belongs to the field of vehicle installation, and particularly relates to a welding and positioning method for a tail connecting lock of a large electric drive vehicle, which comprises the following steps: s1: rechecking the positioning device; s2: assembling the structural member with the positioning device; s3: hoisting a combined body assembled by the first assembled body and the second assembled body to a corresponding position on a vehicle girder, and connecting the combined body with a lower fulcrum of the chassis; the other end makes the welding bottom surface of the assembly flush with the rear beam of the vehicle, the clearance is less than or equal to 0.1mm, and a locking nut of the fixed support lug and a bolt of the fixed tail connecting lock are respectively screwed down; s4: comparing 2 measuring columns and 2 marker posts on the positioning device with a longitudinal symmetrical plane of the chassis by using a theodolite, correspondingly adjusting until the measuring columns and the marker posts are overlapped, determining the position of the positioning device, and meeting the requirement of design on the assembly form and position tolerance of the support lug and the tail connecting lock; and performing the subsequent steps. The invention has the advantages of determining the welding and positioning positions in the assembling process of the vehicle tail connecting lock and the support lug and simplifying the positioning method.
Description
Technical Field
The invention belongs to the field of vehicle installation, and particularly relates to a welding and positioning method for a tail connecting lock of a large electric drive vehicle.
Background
In the assembly process of a large vehicle, the vehicle is large, the positioning precision is high, the conventional positioning method cannot meet the requirements of assembly and period, the positioning of structural parts in the assembly process is difficult, the detection of spatial position relation size and form and position tolerance is tedious, and the final result is difficult to guarantee, so that the condition that relevant parts are in butt joint dislocation or have interference after being assembled occurs, the assembly positioning of some important parts is inaccurate, the assembly error is large, and partial performance of the vehicle is influenced.
Large vehicles are of a wide variety, and there is no universal way to locate important structural components. The main problems existing at present are that: the chassis manufacturer finishes welding and processing the lower support. Because the position of the tail part relative to the crossbeam of the chassis is determined, the positioning of other important parts in the subsequent final assembly process, including the tail part connecting lock, the rotary lug, the air bag constant force supporting device, the cabin body auxiliary supporting device and the relative position precision requirement of the longitudinal line of the whole vehicle, is high, and the tail part connecting lock and the rotary lug need to be assembled and positioned through a special positioning method and a positioning device. If necessary, the process is adjusted and confirmed by using the detection of the laser tracker and the theodolite. The method mainly adopted at present is that simple positioning tools are assembled temporarily, field one-by-one detection is carried out, a theodolite, a laser tracker and the like are matched, the efficiency is low, the period is long, the cost is high, the precision is inaccurate, and the situation of repeated disassembly and assembly occurs in the assembling process.
Disclosure of Invention
In order to solve the problems, the invention provides a welding and positioning method for a large-sized electric drive vehicle tail connecting lock, which is used for determining the welding and positioning position in the assembling process of a vehicle tail connecting lock and a support lug and simplifying the positioning method.
The technical scheme of the invention is as follows:
a welding and positioning method for a tail connecting lock of a large electric drive vehicle comprises the following steps:
s1: rechecking the positioning device;
s11: pre-checking the size and form and position tolerance of the positioning device,
ensure that the coaxiality of the positioning device is less than or equal to phi 0.1mm and form and position tolerance holes
Perpendicularity with the central longitudinal line of the marker post is less than or equal to 0.1mm, and a form and position tolerance hole
The verticality with the central longitudinal line of the marker post is less than or equal to 0.1 mm; ensuring that the positioning device is free from plastic deformation.
S12: polishing the installation surfaces of the chassis connecting lock and the support lug to ensure that the flatness is less than or equal to 0.1 mm;
s13: aligning the longitudinal symmetry plane of the vehicle, coinciding with the original position data, and identifying;
s2: assembling the structural member with the positioning device;
s21: in a ground assembly area, positioning a support lug through 2 large mandrels, and fixing the support lug and a welding bracket together by using a locking nut to form a first assembly body;
s22: fixing the small core shaft on the welding support, respectively penetrating the tail connecting locks on the small core shafts on two sides, and respectively fixing the small core shafts by using gaskets and bolts to form a second assembly body;
S3: hoisting a combined body assembled by the first assembled body and the second assembled body to a corresponding position on a vehicle girder, and connecting the combined body with a lower fulcrum of the chassis; the other end makes the welding bottom surface of the assembly flush with the rear beam of the vehicle, the clearance is less than or equal to 0.1mm, and a locking nut of the fixed support lug and a bolt of the fixed tail connecting lock are respectively screwed down;
s4: comparing 2 measuring columns and 2 marker posts on the positioning device with a longitudinal symmetrical plane of the chassis by using a theodolite, correspondingly adjusting until the measuring columns and the marker posts are overlapped, determining the position of the positioning device, and meeting the requirement of design on the assembly form and position tolerance of the support lug and the tail connecting lock;
s5: determining the position of the positioning device by using monitoring equipment, and ensuring that the position size and form and position tolerance of the positioning device meet the requirements of a drawing;
s6: after spot welding positioning, position size and form and position tolerance are retested again to ensure that the requirements of a drawing are met;
s7: performing subsequent welding line cooling;
s8: and (5) performing full welding to finish alignment, positioning and assembly of the vehicle connecting lock and the support lug.
Further, S51: adjusting the detection value of the positioning device according to the step S4, adding gaskets on two sides of the lower support, and finally determining the positions of the lower fulcrum connecting lock and the support lug;
S52: the positioning device is used for connecting and confirming the tail connecting lock and the support lug by taking the lower support as a reference, the laser tracker and the theodolite are used for detecting the coaxiality of the axes of the connecting lock and the support lug and the verticality and the symmetry of the whole vehicle symmetry plane, the positions of the connecting lock and the support lug are determined, and the connecting lock and the support lug are positioned by spot welding.
Further, the subsequent step of cooling the weld bead in step S7 is: after the welding seam is cooled, removing the gasket to separate the tail connecting lock from the positioning device; loosening the locking nut, withdrawing the large mandrel from the support lug, and separating the support lug from the positioning device; the positioning device is lifted off the vehicle.
Further, the subsequent step of cooling the weld bead in step S7 is: after the welding seam is cooled, removing the gasket to separate the tail connecting lock from the positioning device; loosening the locking nut, withdrawing the large mandrel from the support lug, and separating the support lug from the positioning device; the positioning device is lifted off the vehicle.
The invention has the beneficial effects that:
1. the invention utilizes a positioning method to solve the problem that the spatial position relation which is correlated with the longitudinal reference of the whole vehicle and the lower support at the bottom of the chassis in the tail connecting lock assembling process has strict requirements on the assembling size and the precision of a plurality of form and position tolerances after assembling, can not be detected by common metering equipment, and needs to be detected by special process equipment such as positioning detection, wire drawing and the like and high-precision metering equipment such as a laser tracker, a theodolite and the like. Therefore, the problems of welding positioning determination and form and position tolerance control in the assembly process of the tail connecting lock of the large vehicle are solved, the drawing size is ensured, and the interference problem is avoided.
2. The invention simplifies the positioning method, can reduce the weight of the positioning device, meets the assembly requirement of the electric drive chassis, and solves the problems of inaccurate positioning caused by poor rigidity of the electric drive chassis of a large-scale electric drive vehicle and difficult control of the leveling effect.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic structural view of a positioning tool of the present invention;
FIG. 3 is a partially enlarged view of the connection between the lug of the positioning device and the lower fulcrum of the chassis;
wherein, 1: connecting lock, 2: lug, 3: lower fulcrum junction, 4: marker post, 5: measuring rod, 6: positioning device, 7: gasket, 8: chassis lower support, 9: and (7) a pin shaft.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in FIG. 1, the welding and positioning method for the tail connecting lock of the large electric drive vehicle comprises the following steps:
s1: rechecking the positioning device;
s11: pre-checking the size and form and position tolerance of the positioning device,
ensure that the coaxiality of the positioning device is less than or equal to phi 0.1mm and form and position tolerance holes
Perpendicularity with the central longitudinal line of the marker post is less than or equal to 0.1mm, and a form and position tolerance hole
The verticality with the central longitudinal line of the marker post is less than or equal to 0.1 mm; ensuring that the positioning device is free from plastic deformation.
S12: polishing the installation surfaces of the chassis connecting lock and the support lug to ensure that the flatness is less than or equal to 0.1 mm;
S13: aligning the longitudinal symmetry plane of the vehicle, coinciding with the original position data and marking;
s2: assembling the structural member with the positioning device;
s21: in a ground assembly area, positioning a support lug through 2 large mandrels, and fixing the support lug and a welding bracket together by using a locking nut to form a first assembly body;
s22: fixing the small core shaft on the welding support, respectively penetrating the tail connecting locks on the small core shafts on two sides, and respectively fixing the small core shafts by using gaskets and bolts to form a second assembly body;
s3: hoisting a combined body assembled by the first assembled body and the second assembled body to a corresponding position on a vehicle girder, and connecting the combined body with a lower fulcrum of the chassis; the other end makes the welding bottom surface of the assembly flush with the rear beam of the vehicle, the clearance is less than or equal to 0.1mm, and a locking nut of the fixed support lug and a bolt of the fixed tail connecting lock are respectively screwed down;
s4: comparing 2 measuring columns and 2 marker posts on the positioning device with a longitudinal symmetrical plane of the chassis by using a theodolite, correspondingly adjusting until the measuring columns and the marker posts are overlapped, determining the position of the positioning device, and meeting the requirement of design on the assembly form and position tolerance of the support lug and the tail connecting lock;
s5: determining the position of the positioning device by using monitoring equipment, and ensuring that the position size and form and position tolerance of the positioning device meet the requirements of a drawing;
S51: adjusting the detection value of the positioning device according to the step S4, adding gaskets on two sides of the lower support, and finally determining the positions of the lower fulcrum connecting lock and the support lug;
s52: the positioning device is used for connecting and confirming the tail connecting lock and the support lug by taking the lower support as a reference, the laser tracker and the theodolite are used for detecting the coaxiality of the axes of the connecting lock and the support lug and the verticality and the symmetry of the whole vehicle symmetry plane, the positions of the connecting lock and the support lug are determined, and the connecting lock and the support lug are positioned by spot welding.
S6: after spot welding positioning, position size and form and position tolerance are retested again to ensure that the requirements of a drawing are met;
s7: performing subsequent welding line cooling; the subsequent steps of cooling the weld joint in the step S7 are as follows: after the welding seam is cooled, removing the gasket to separate the tail connecting lock from the positioning device; loosening the locking nut, withdrawing the large mandrel from the support lug, and separating the support lug from the positioning device; the positioning device is lifted off the vehicle.
S8: and (5) performing full welding to finish the alignment, positioning and assembly of the vehicle connecting lock and the support lug.
FIG. 2 is a schematic structural view of a positioning tool of the present invention;
FIG. 3 is a partially enlarged view of the connection between the lug of the positioning device and the lower fulcrum of the chassis;
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (3)
1. A welding and positioning method for a tail connecting lock of a large electric drive vehicle is characterized by comprising the following steps of:
s1: rechecking the positioning device;
s11: pre-checking the size and form and position tolerance of the positioning device; the coaxiality of the positioning device is less than or equal to phi 0.1mm, the positioning device comprises support lugs positioned by 2 large mandrels and tail connecting locks respectively penetrating through the small mandrels at the two sides(ii) a Form and position tolerance hole
Perpendicularity with the central longitudinal line of the marker post is less than or equal to 0.1mm, and a form and position tolerance hole
The verticality with the central longitudinal line of the marker post is less than or equal to 0.1 mm;
s12: polishing the installation surfaces of the chassis connecting lock and the support lug to ensure that the flatness is less than or equal to 0.1 mm;
s13: aligning the longitudinal symmetry plane of the vehicle, coinciding with the original position data, and identifying;
s2: assembling the structural member with the positioning device;
s21: in the ground assembly area, positioning the support lug through 2 large mandrels, and fixing the support lug and the welding bracket together by using a locking nut to form a first assembly body;
s22: fixing the small core shaft on the welding support, respectively penetrating the tail connecting locks on the small core shafts on two sides, and respectively fixing the small core shafts by using gaskets and bolts to form a second assembly body;
s3: hoisting a combined body assembled by the first assembled body and the second assembled body to a corresponding position on a vehicle girder, and connecting the combined body with a lower support of the chassis; the other end makes the welding bottom surface of the assembly flush with the rear beam of the vehicle, the clearance is less than or equal to 0.1mm, and a locking nut of the fixed support lug and a bolt of the fixed tail connecting lock are respectively screwed down;
S4: comparing 2 measuring rods and 2 marker rods on the positioning device with a longitudinal symmetrical plane of the chassis by using a theodolite, correspondingly adjusting until the measuring rods and the marker rods are overlapped, and determining the position of the positioning device to meet the design requirement of assembly form and position tolerance of the support lug and the tail connecting lock;
s5: determining the position of the positioning device by using monitoring equipment, and ensuring that the position size and form and position tolerance of the positioning device meet the requirements of a drawing;
s6: after spot welding positioning, position size and form and position tolerance are retested again to ensure that the requirements of a drawing are met;
s7: performing subsequent welding line cooling;
s8: and (5) performing full welding to finish alignment, positioning and assembly of the vehicle connecting lock and the support lug.
2. The welding and positioning method for the tail connecting lock of the large electric drive vehicle as claimed in claim 1, characterized in that: s51: adjusting the detection value of the positioning device according to the step S4, adding gaskets on two sides of a lower support of the chassis, and finally determining the positions of a connecting lock and a support lug at the joint of the lower fulcrum;
s52: the positioning device is utilized, the chassis lower support is taken as a reference, the tail connecting lock and the support lug are connected and confirmed, the laser tracker and the theodolite are used for detecting the coaxiality of the axes of the connecting lock and the support lug and the verticality and the symmetry of the longitudinal symmetry plane of the vehicle, the positions of the connecting lock and the support lug are determined, and the connecting lock and the support lug are positioned by spot welding.
3. The welding and positioning method for the tail connecting lock of the large electric drive vehicle as claimed in claim 1, wherein the subsequent step of cooling the weld in the step S7 is as follows: after the welding seam is cooled, removing the gasket to separate the tail connecting lock from the positioning device; loosening the locking nut, withdrawing the large mandrel from the support lug, and separating the support lug from the positioning device; the positioning device is lifted off the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911335342.8A CN111098078B (en) | 2019-12-23 | 2019-12-23 | Welding positioning method for tail connecting lock of large electric drive vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911335342.8A CN111098078B (en) | 2019-12-23 | 2019-12-23 | Welding positioning method for tail connecting lock of large electric drive vehicle |
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| Publication Number | Publication Date |
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| CN111098078A CN111098078A (en) | 2020-05-05 |
| CN111098078B true CN111098078B (en) | 2022-05-24 |
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| CN201911335342.8A Active CN111098078B (en) | 2019-12-23 | 2019-12-23 | Welding positioning method for tail connecting lock of large electric drive vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111874105B (en) * | 2020-07-02 | 2022-11-15 | 东风柳州汽车有限公司 | Charging opening cover installation tool |
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| KR100792891B1 (en) * | 2006-10-10 | 2008-01-08 | 현대자동차주식회사 | Jig for assembling various vehicle's front end module |
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| CN101422854A (en) * | 2007-10-31 | 2009-05-06 | 上海海马汽车研发有限公司 | Vehicle body module pre-assembly structure and method |
| CN202317531U (en) * | 2011-11-15 | 2012-07-11 | 南车二七车辆有限公司 | Sliding type positioning device of spanning beam hanger of bogie of railway freight car |
| CN104439849A (en) * | 2014-12-09 | 2015-03-25 | 南车石家庄车辆有限公司 | Main platform ear plate fast assembling tooling and ear plate assembling method |
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| CN111098078A (en) | 2020-05-05 |
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