CN111069832A - Welding tool for improving welding qualification rate of chain wheel and welding process using welding tool - Google Patents
Welding tool for improving welding qualification rate of chain wheel and welding process using welding tool Download PDFInfo
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- CN111069832A CN111069832A CN201911397384.4A CN201911397384A CN111069832A CN 111069832 A CN111069832 A CN 111069832A CN 201911397384 A CN201911397384 A CN 201911397384A CN 111069832 A CN111069832 A CN 111069832A
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- 238000003466 welding Methods 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012797 qualification Methods 0.000 title claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000009191 jumping Effects 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000002441 reversible effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 239000004753 textile Substances 0.000 description 1
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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
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Abstract
According to the welding tool for improving the welding qualification rate of the chain wheel and the welding process applying the welding tool, the welding deformation characteristic is utilized, the two end faces are machined to form a certain taper in the opposite direction of deformation when a chain sheet is subjected to finish turning by using the inverse deformation principle, the end faces are restored after the welding deformation, the end face jumping is controlled, and the qualification rate of the welding process is improved; and redesigning a welding tool, pressing 90% of two end faces of the chain sheet by using a splash shield and a locking pressure plate, leaving only 10% of places to be exposed, leaving enough welding space, pressing the wheel hub by using the end face, then automatically performing girth welding, cooling and then detaching, and completing welding, so that the welding process is stable, end jump and deterioration of the chain sheet can be effectively controlled, and the qualification rate of the welding process is improved.
Description
Technical Field
The invention relates to the field of production and processing of chain wheels, in particular to a welding tool for improving the welding qualification rate of chain wheels and a welding process applying the welding tool.
Background
The sprocket is a wheel with cogged sprocket teeth for meshing with precisely pitched blocks on a chain link or cable. The chain wheel is widely applied to mechanical transmission and the like in the industries of chemical engineering, textile machinery, escalators, wood processing, three-dimensional parking garages, agricultural machinery, food processing, instruments, petroleum and the like. In daily production, the one-time delivery yield of the chain wheel product cannot meet the production requirement, and the main reasons are unqualified welding procedures and unqualified fine boring procedures through analysis, wherein the unqualified welding procedures are the most important reasons.
Aiming at the reason of low percent of pass of the welding procedure, analysis is carried out according to the variety of the welded chain wheel, and the main disqualification is 47586463 double-row chain wheel. 47586463 double sprocket failure reason: the chain piece end runout is out of tolerance, double-row chain wheels are adopted, the structure is complex, the thicknesses of two types of chain pieces are thin, the chain pieces are easy to deform during welding, deformation is not regular, the deformation quantities of parts with different diameters and thicknesses are inconsistent, and the chain piece end runout is unqualified. For further analysis, there are two main reasons: 1. the tool used during welding has an unreasonable structure, so that the tool cannot control the deformation of the chain sheet, and the welding is unqualified; 2. the chain piece has small reverse deformation taper, namely the chain piece has small reverse deformation size, so that the welded chain piece has large variation. Therefore, a welding tool capable of controlling deformation of the chain sheet is needed, and the welding yield is further improved through improving the process.
Disclosure of Invention
The invention aims to solve the defect of low welding deformation qualification rate of a double-row chain wheel in the prior art, and provides a welding tool for improving the welding qualification rate of the chain wheel and a welding process applying the welding tool.
In order to achieve the purpose, the invention adopts the following technical scheme:
a welding tool for improving the welding qualification rate of chain wheels is applied to a double-row chain wheel, and the double-row chain wheel comprises a large chain sheet, a hub and a small chain sheet; the welding tool comprises a positioning base, a splash guard and a locking pressing plate; the positioning base comprises a chassis and a positioning rod vertically fixed in the center of the chassis, external threads are arranged on the side face of the chassis, a hub of the double-row chain wheel is sleeved on the positioning rod, the large chain piece is tightly attached to the chassis, the small chain piece is located above the large chain piece, the splash guard is sleeved on the periphery of the hub and tightly attached to the top of the large chain piece, the locking pressing plate comprises a top surface pressing plate and a locking side wall, a welding hole is formed in the top surface pressing plate, the periphery of the top surface pressing plate vertically extends downwards to form the locking side wall, internal threads matched with the external threads are arranged on the inner side of the locking side wall, the locking pressing plate is sleeved on the splash guard, and the locking side wall and the side wall of the positioning base are locked through threads.
Preferably, the welding tool further comprises a locking wrench, the locking wrench comprises a worm and two worm wheels located at the end of the worm, a plurality of locking holes evenly distributed on the periphery of the welding hole are further formed in the top surface pressure plate, the locking holes are identical to the worm wheels in shape, and the two worm wheels are correspondingly clamped in the two locking holes.
Preferably, the locking hole is a dug circular hole, and the locking hole intersects with the welding hole.
Preferably, the splash plate is an annular plate, the diameter of an inner ring of the splash plate is equal to that of the welding hole, and an outer ring of the splash plate is located outside the locking hole.
Preferably, the diameter of the welding hole is larger than that of the hub, the projected areas of the splash guard and the locking pressure plate on the large chain sheet occupy 90% of the area of the end face of the large chain sheet, and the exposed area of the large chain sheet occupies 10% of the area of the end face of the large chain sheet.
A welding process using the welding tool as set forth in any one of the preceding claims, characterized in that it comprises the following steps:
and 4, cooling, and then detaching the welding tool to finish welding.
Preferably, in the step 1, the chain sheet with the outer circle diameter of 140mm has the taper of 0.65-0.75mm after adjustment, and the variation is 0.32 mm; the taper of the chain sheet with the excircle diameter of 297mm is 0.85-0.95mm after adjustment, and the variation is 0.40 mm.
Preferably, when the welding tool is adopted for compression welding in the step 3, the variation of the chain sheet with the outer circle diameter of 140mm is 0.14mm, and the variation of the chain sheet with the outer circle diameter of 297mm is 0.28 mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the welding process, the characteristic of welding deformation is utilized, the principle of reverse deformation is applied, when the chain sheet is subjected to finish turning, in the opposite direction of deformation, two end faces are machined to form a certain taper, the end faces are restored after welding deformation, end face jumping is controlled, and the qualified rate of the welding process is improved;
aiming at the defect that in the existing welding process, a chain sheet and a wheel hub are installed on a positioning tool after being pressed and are directly welded after the upper end face of the wheel hub is locked, and because the welding part is not heated simultaneously due to rotary welding, the upper end face of the chain sheet is not compressed, and the upper end face of the chain sheet cannot be effectively controlled within a tolerance range by reverse deformation taper, so that the variation of the chain sheet exceeds the range, the welding tool is redesigned, 90% of the two end faces of the chain sheet are completely compressed by using a splash board and a locking pressing board, only 10% of places are exposed, enough welding space is reserved, the wheel hub is compressed by using the end face, then automatic girth welding is carried out, and the wheel hub is detached after being cooled, so that the welding process is stable, the end jumping and variation of the chain sheet can be effectively controlled, and the qualification rate.
Drawings
FIG. 1 is a schematic structural diagram of a welding tool for improving the welding yield of a sprocket;
FIG. 2 is a schematic structural view of a positioning base;
FIG. 3 is a schematic view of the splash plate;
FIG. 4 is a schematic structural view of the locking pressure plate;
FIG. 5 is a schematic structural view of the locking wrench;
FIG. 6 is a schematic view of a double row sprocket.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 to 6, the present invention provides a welding tool for improving the welding pass percent of a sprocket, wherein the welding tool is applied to a double sprocket 5, as shown in fig. 6, the double sprocket 5 includes a large chain piece 51, a hub 52 and a small chain piece 53; as shown in fig. 1-4, the welding tool comprises a positioning base 1, a splash guard 2 and a locking pressing plate 3; the positioning base 1 comprises a base plate 11 and a positioning rod 12 vertically fixed at the center of the base plate 11, the side surface of the base plate 11 is provided with an external thread 13, a hub 52 of the double-row chain wheel 5 is sleeved on the positioning rod 12, a large chain piece 51 is tightly attached to the base plate 11, a small chain piece 53 is positioned above the large chain piece 51, the splash guard 2 is sleeved on the periphery of the hub 52 and tightly attached to the top of the large chain piece 51, the locking pressing plate 3 comprises a top surface pressing plate 31 and a locking side wall 32, a welding hole 33 is formed in the top surface pressing plate 31, the periphery of the top surface pressing plate 31 vertically extends downwards to form a locking side wall 32, the inner side of the locking side wall 32 is provided with an internal thread 34 matched with the external thread 13, the locking pressing plate 3 is sleeved.
The double-row chain wheel 5, the splash guard 2 and the locking pressure plate 3 are arranged on the positioning base 1 in a central symmetry way around the fixed rod 12, the traditional welding process is that the large chain sheet 51 and the hub 52 are arranged on the positioning tool after being pressed and are directly welded, because the welding position is not heated simultaneously due to the rotary welding, the upper end surface of the large chain sheet 51 is not compressed, and the tolerance range can not be effectively controlled by the anti-deformation taper, the welding tool of the invention is also provided with the splash guard 2 above the large chain sheet 51, and is sleeved with the locking pressure plate 3, the locking pressure plate 3 is pressed above the splash guard 2, the locking pressure plate 3 and the splash guard 2 together compress the end surface of the large chain sheet 51 by 90% of area, and 10% of the area of the end surface of the circular chain wheel exposed in the welding hole 33 in the middle of the locking pressure plate 3 is left, the circular seam welding is carried out by using a welding gun, so that the welding position is not heated simultaneously, the upper end surface of the chain sheet is not pressed, and the end jump and the variation of the chain sheet exceed the qualified requirements.
Preferably, as shown in fig. 5, the welding tool further includes a locking wrench 4, the locking wrench 4 includes a worm 41 and two worm wheels 42 located at ends of the worm 41, the top platen 31 is further provided with a plurality of locking holes 35 uniformly distributed on the periphery of the welding hole 33, the locking holes 35 and the worm wheels 42 have the same shape, and the two worm wheels 42 are correspondingly clamped in the two locking holes 35. Because the locking pressing plate 3 is detachably connected with the positioning base 1 through the external thread 13 and the internal thread 34, and because the positioning base 1 is heavy in weight and is not easy to rotate and lock, the worm wheel 42 of the locking wrench 4 is clamped in the locking hole 35, and the worm 41 is rotated to drive the locking pressing plate 2 to rotate and lock.
Preferably, as shown in fig. 4, the locking hole 35 is a circular hole dug out, and the locking hole 35 intersects with the welding hole 33, so that the splash guard 2 is conveniently padded between the locking hole 35 and the large chain piece 51 to prevent sparks generated during welding from splashing onto the large chain piece 51. The central angle of the locking hole 35 is larger than 270 degrees, so that the worm wheel 42 is prevented from sliding out of the locking hole 35 when rotating, and the locking effect is prevented from being influenced.
Preferably, as shown in fig. 3, the splash shield 2 is an annular plate, the diameter of the inner ring of the splash shield 2 is equal to the diameter of the welding hole 33, and the outer ring of the splash shield 2 is located outside the locking hole 35, so that the splash shield 2 completely blocks the end surface of the large chain piece 51 below the locking hole 35 to prevent sparks during welding from splashing onto the large chain piece 51.
Preferably, as shown in fig. 1, the diameter of the welding hole 33 is larger than that of the hub 52, the projected area of the splash shield 2 and the locking pressure plate 3 on the large chain piece 51 occupies 90% of the end surface area of the large chain piece 51, and the exposed area of the large chain piece 51 occupies 10% of the end surface area of the large chain piece 51.
A welding process employing a welding tool as claimed in any one of the preceding claims, comprising the steps of:
and 4, cooling, and then detaching the welding tool to finish welding.
The process of the step 1 utilizes the characteristic of welding deformation and applies the principle of reverse deformation, two end faces are processed into certain taper in the opposite direction of deformation when the chain sheet is subjected to finish turning, the end faces are restored after the welding deformation, the end face jumping is controlled, and the qualified rate of the welding process is improved.
Adjusting the deformation of chain sheets with different excircle diameters according to the variation of the sample, determining the taper size (see table 1), tracking the detection and verification result of the sample (see table 2), enabling the end jump of the chain sheet to meet the drawing requirements, and enabling the variation to be 0.32-0.40mm to meet the target requirements
TABLE 1 chain piece finish turning taper parameter adjustment results
TABLE 2 welding results after fine turning of the taper of the link
The process of the step 2-3 aims at solving the problem that in the existing welding process, a chain sheet and a hub are installed on a positioning tool after being pressed and are directly welded after the upper end face of the hub is locked, because the welding part is not heated simultaneously due to rotary welding, the upper end face of the chain sheet is not compressed, the upper end face of the chain sheet cannot be effectively controlled within a tolerance range by means of reversible deformation taper, and the variation of the chain sheet exceeds the range.
Redesigning and manufacturing the pressing plate type welding tool, tracking the verification effect of the trial-manufacturing process on the sample (see table 3), finding that the end jump of the chain sheet meets the requirement, the variation is 0.14-0.28mm, and the welding result is qualified.
TABLE 3 welding test results after fine turning of chain piece
According to the welding process, the characteristics of welding deformation are utilized, the reverse deformation principle is applied, when the chain sheet is subjected to finish turning, the two end faces are machined to have certain taper in the reverse direction of deformation, the end faces are restored after the welding deformation, the end face jumping is controlled, and the qualified rate of the welding process is improved; in addition, the welding tool is redesigned, 90% of two end faces of the chain sheet are completely compressed by the splash shield and the locking pressing plate, only 10% of places are left to be exposed and enough welding space is left, the wheel hub is compressed by the end faces, then automatic girth welding is carried out, the wheel hub is disassembled after being cooled, welding is completed, the welding process is stable, end jumping and deterioration of the chain sheet can be effectively controlled, and the qualified rate of the welding process is improved.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (8)
1. A welding tool for improving the welding qualification rate of chain wheels is applied to a double-row chain wheel, and the double-row chain wheel comprises a large chain sheet, a hub and a small chain sheet; the method is characterized in that: comprises a positioning base, a splash guard and a locking pressing plate; the positioning base comprises a chassis and a positioning rod vertically fixed in the center of the chassis, external threads are arranged on the side face of the chassis, a hub of the double-row chain wheel is sleeved on the positioning rod, the large chain piece is tightly attached to the chassis, the small chain piece is located above the large chain piece, the splash guard is sleeved on the periphery of the hub and tightly attached to the top of the large chain piece, the locking pressing plate comprises a top surface pressing plate and a locking side wall, a welding hole is formed in the top surface pressing plate, the periphery of the top surface pressing plate vertically extends downwards to form the locking side wall, internal threads matched with the external threads are arranged on the inner side of the locking side wall, the locking pressing plate is sleeved on the splash guard, and the locking side wall and the side wall of the positioning base are locked through threads.
2. The welding tool for improving the welding qualification rate of the chain wheel according to claim 1, is characterized in that: the welding tool further comprises a locking wrench, the locking wrench comprises a worm and two worm wheels located at the end portions of the worm, a plurality of locking holes which are evenly distributed on the periphery of the welding holes are further formed in the top surface pressure plate, the locking holes are identical to the worm wheels in shape, and the two worm wheels are correspondingly clamped in the two locking holes.
3. The welding tool for improving the welding qualification rate of the chain wheel according to claim 2, is characterized in that: the locking hole is a dug circular hole, and the locking hole is intersected with the welding hole.
4. The welding tool for improving the welding qualification rate of the chain wheel according to claim 3, is characterized in that: the splash guard is an annular plate, the diameter of an inner ring of the splash guard is equal to that of the welding hole, and an outer ring of the splash guard is located on the outer side of the locking hole.
5. The welding tool for improving the welding qualification rate of the chain wheel according to claim 4, is characterized in that: the diameter of the welding hole is larger than that of the hub, the projected areas of the splash guard and the locking pressure plate on the large chain sheet occupy 90% of the area of the end face of the large chain sheet, and the exposed area of the large chain sheet occupies 10% of the area of the end face of the large chain sheet.
6. A welding process applying the welding tool according to any one of claims 1-5, characterized by comprising the following steps:
step 1, during fine turning processing of the chain sheet, processing two end faces into a certain taper in the opposite direction of deformation, adjusting the deformation of the chain sheet with different excircle diameters according to the variation of a sample piece, determining the taper scale of the chain sheet and adjusting the taper scale;
step 2, installing a positioning base, placing double rows of chain wheels needing to be welded above a chassis of the positioning base, enabling a large chain plate to be located below, a small chain plate to be located above, placing a splash guard on the large chain plate, sleeving a locking pressing plate above the splash guard, and screwing the locking pressing plate on the positioning base through internal threads in a rotating mode;
step 3, the welding tool completely compresses 90% of two end faces of the large chain sheet, only 10% of places are left exposed, a welding space is left, the wheel hub is compressed by the end faces, and then automatic girth welding is carried out;
and 4, cooling, and then detaching the welding tool to finish welding.
7. The welding process for the application of the welding tooling of claim 6, wherein: in the step 1, the taper of the chain sheet with the outer circle diameter of 140mm is adjusted to be 0.65-0.75mm, and the variation is 0.32 mm; the taper of the chain sheet with the excircle diameter of 297mm is 0.85-0.95mm after adjustment, and the variation is 0.40 mm.
8. The welding process for the application of the welding tooling of claim 7, wherein: when the welding tool is adopted for compression welding in the step 3, the variation of the chain sheet with the excircle diameter of 140mm is 0.14mm, and the variation of the chain sheet with the excircle diameter of 297mm is 0.28 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397384.4A CN111069832A (en) | 2019-12-30 | 2019-12-30 | Welding tool for improving welding qualification rate of chain wheel and welding process using welding tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397384.4A CN111069832A (en) | 2019-12-30 | 2019-12-30 | Welding tool for improving welding qualification rate of chain wheel and welding process using welding tool |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5188278A (en) * | 1990-11-22 | 1993-02-23 | A & S Corporation | Friction welding method for joining a rim and a disc of a disc wheel and the apparatus therefor |
| CN102049646A (en) * | 2010-12-23 | 2011-05-11 | 唐山轨道客车有限责任公司 | Tool supporting plate, assembly welding tool and radian profile welding method |
| CN203621833U (en) * | 2013-07-09 | 2014-06-04 | 中煤张家口煤矿机械有限责任公司 | Sprocket wheel automatic welding special machine |
| CN109986264A (en) * | 2018-11-27 | 2019-07-09 | 苏州新达电扶梯部件有限公司 | A kind of elevator driving left and right chain piece synchronous welding tooling |
| CN209206825U (en) * | 2018-12-24 | 2019-08-06 | 佛山市德琞科技股份有限公司 | A kind of elevator sprocket wheel welding clamping tooling |
| CN211680678U (en) * | 2019-12-30 | 2020-10-16 | 兴化东华齿轮有限公司 | Welding tool for improving welding qualification rate of chain wheels |
-
2019
- 2019-12-30 CN CN201911397384.4A patent/CN111069832A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5188278A (en) * | 1990-11-22 | 1993-02-23 | A & S Corporation | Friction welding method for joining a rim and a disc of a disc wheel and the apparatus therefor |
| CN102049646A (en) * | 2010-12-23 | 2011-05-11 | 唐山轨道客车有限责任公司 | Tool supporting plate, assembly welding tool and radian profile welding method |
| CN203621833U (en) * | 2013-07-09 | 2014-06-04 | 中煤张家口煤矿机械有限责任公司 | Sprocket wheel automatic welding special machine |
| CN109986264A (en) * | 2018-11-27 | 2019-07-09 | 苏州新达电扶梯部件有限公司 | A kind of elevator driving left and right chain piece synchronous welding tooling |
| CN209206825U (en) * | 2018-12-24 | 2019-08-06 | 佛山市德琞科技股份有限公司 | A kind of elevator sprocket wheel welding clamping tooling |
| CN211680678U (en) * | 2019-12-30 | 2020-10-16 | 兴化东华齿轮有限公司 | Welding tool for improving welding qualification rate of chain wheels |
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