CN112192007A - Welding device and method for double-weld-joint expanding center support argon arc welding - Google Patents
Welding device and method for double-weld-joint expanding center support argon arc welding Download PDFInfo
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- CN112192007A CN112192007A CN202011052951.5A CN202011052951A CN112192007A CN 112192007 A CN112192007 A CN 112192007A CN 202011052951 A CN202011052951 A CN 202011052951A CN 112192007 A CN112192007 A CN 112192007A
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 238000003466 welding Methods 0.000 title claims abstract description 103
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title abstract description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 103
- 239000007789 gas Substances 0.000 claims description 78
- 238000003825 pressing Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005493 welding type Methods 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- 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
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a welding device and a welding method for double-weld expansion core support argon arc welding.A double-layer expansion core structure is adopted, a lower layer expansion core mechanism is provided with a long rod nut, and the long rod nut extends out of an upper layer expansion core mechanism to operate and control the opening and closing of the lower layer expansion core mechanism; the upper layer core expanding mechanism adopts a mode of adding a hollow positioning shaft and an upper layer split nut to control the opening and closing of the upper layer core expanding mechanism, and the upper layer core expanding mechanism and the lower layer core expanding mechanism can be effectively and separately operated by adopting the arrangement. The invention solves the assembly problem of the welding assembly, ensures that the cylindrical part which is originally easy to deform into the elliptical ring is supported by the expansion block to be round, ensures quick assembly, greatly reduces the manual adjustment time, ensures quick welding assembly, is convenient to operate, has good welding quality, overcomes the welding difficulty, ensures that the cylindrical part which is originally easy to deform into the elliptical ring is supported by the expansion block to be round, ensures quick assembly, greatly reduces the manual adjustment time, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of welding of engine components, and particularly relates to a welding device and method for double-weld-joint expanding-core support argon arc welding.
Background
When a front section shell of a certain engine is welded, two circles of circular welding seams need to be welded, but the welding difficulty is high, firstly, a welding part is a large thin-wall annular part, and a cylindrical part at the middle section belongs to a metal plate, so that the deformation is very easy to occur during welding; secondly, the quality requirement of the welding seam is high, the grade requirement is two types, the X-ray is used for flaw detection, and the protrusion of the welding seam of the inner runner surface on the surface of the matrix is required to be not more than 0.4 mm; the butt seam welding belongs to butt seam welding without reserved rabbets, but because the wall of the cylindrical part is thin, the shape is not controlled during welding, the cylindrical part is easy to become oval, the butt joint of welding seams is not good, and the assembly becomes very complicated.
In the past, the used device is too simple, only the centering spigot is arranged on the device, the adjustment amount is large during use, the assembly time is long, the quality of a welded seam is poor, and multiple repair welding and additional work are required subsequently. For such high weld seam requirements, a special device is required to be used during welding, so that a special welding device is urgently needed to solve the technical problem of the double-weld-seam assembly argon arc welding of the thin-wall easily-deformed part and ensure the quality of the weld seam.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a welding device and a welding method for double-weld expanding center support argon arc welding, which solve the technical problem of double-weld assembly argon arc welding of thin-wall easily-deformed parts and ensure the quality of welding seams.
In order to achieve the purpose, the invention provides the following technical scheme that the welding device for the double-welding-seam core-expanding support argon arc welding comprises a lower-layer core-expanding mechanism, an upper-layer core-expanding mechanism and a long-rod nut arranged between the lower-layer core-expanding mechanism and the upper-layer core-expanding mechanism, wherein the centers of the lower-layer core-expanding mechanism and the upper-layer core-expanding mechanism are on the same axis, a hollow positioning shaft is arranged at the center of the upper-layer core-expanding mechanism, a through hole is arranged at the center of the hollow positioning shaft, an upper-layer split nut is arranged on the outer side of the hollow positioning shaft, and the upper-layer split nut is used for controlling the opening and closing of the; the lower-layer core expanding mechanism is characterized in that a positioning shaft is arranged at the center of the lower-layer core expanding mechanism, the lower end of a long rod nut is connected with the positioning shaft, the upper end of the long rod nut extends out of a through hole in the hollow positioning shaft, and the long rod nut is used for controlling the opening and closing of the lower-layer core expanding mechanism.
Furthermore, the long rod nut is a stepped shaft, the uppermost end of the long rod nut is provided with a hexagon, the inner surface of the lowermost end of the long rod nut is provided with an internal thread, the positioning shaft is provided with an external thread, and the long rod nut is in threaded connection with the positioning shaft; the long rod nut is provided with an internal thread, one end of the long rod nut is provided with a protruding long rod nut shaft shoulder, a cone is arranged outside the positioning shaft, and the long rod nut shaft shoulder is used for hanging the cone and driving the cone to slide up and down so as to control the opening and closing of the lower-layer core expanding mechanism.
Further, the hollow positioning shaft is a step shaft and comprises a first step shaft, a second step shaft and a third step shaft, the hollow positioning shaft is formed in one step, an external thread is arranged on the outer surface of the first step shaft, the upper-layer split nut is in threaded connection with the first step shaft, the second step shaft is used for playing a role in positioning the center of the upper-layer core expanding mechanism, the third step shaft is concentric with the upper-layer core expanding mechanism, a hollow positioning shaft shoulder is arranged at the bottom of the third step shaft, and the hollow positioning shaft shoulder is connected with the upper-layer core expanding mechanism.
Furthermore, the lower layer core expanding mechanism comprises a bottom plate, and the positioning shaft is in threaded connection with the bottom plate; the outer ring of the bottom plate is provided with a lower pressing plate assembly, and the lower pressing plate assembly is used for fixedly pressing a lower flange; the bottom plate is provided with a plurality of positioning supports, the bottom of each positioning support is provided with two pin holes matched with the two pin holes on the bottom plate, and the positioning supports support the upper layer core expanding mechanism.
Furthermore, the locating shaft is sleeved with a cone, the cone is provided with eight connecting surfaces, each connecting surface of the cone is connected with a lower-layer expansion block, a guide plate is arranged on each lower-layer expansion block, each lower-layer expansion block is connected with a lower-layer fan-shaped ring to form a lower-layer circle supporting component, and each lower-layer circle supporting component is used for supporting a cylindrical part into a circle.
Furthermore, the upper layer core expanding mechanism also comprises an upper layer supporting plate, the upper layer supporting plate is arranged on the positioning bracket and is fixedly connected with the positioning bracket, an upper laminated plate assembly is arranged on the outer ring of the upper layer supporting plate, and the upper laminated plate assembly is used for fixedly pressing the upper flange; the center of the upper layer supporting plate is provided with a hollow positioning shaft, and the hollow positioning shaft and the upper layer supporting plate are fixed through screws.
Furthermore, the hollow positioning shaft is connected with the upper layer split nut through an external thread, the upper layer split nut is sleeved with an upper layer cone, the upper layer cone is connected with 8 upper layer expansion blocks, the upper layer expansion block is provided with an upper layer guide plate, the upper layer expansion blocks are connected with the upper layer sector ring to form an upper layer circle supporting part, when the upper layer split nut is rotated, the upper layer cone drives the 8 upper layer expansion blocks to move outwards in a circumferential manner, so that the upper layer sector ring is driven to support the upper edge of the cylindrical part, and at the moment, the circle centers of the upper layer and lower layer core expansion mechanisms are on the same axis.
Furthermore, the welding device is also provided with a built-in gas circuit, the built-in gas circuit is divided into a built-in gas circuit at the upper layer and a built-in gas circuit at the lower layer, one end of an argon gas joint nozzle in the built-in gas circuit at the upper layer is externally connected with argon gas, the other end of the argon gas joint nozzle is connected with a steel pipe, the steel pipe is connected with an annular cavity of an upper layer supporting plate, the steel pipe is used for leading the argon gas from the lower layer core expanding mechanism to the upper layer core expanding mechanism, the annular cavity of the upper layer supporting plate is connected with the gas circuit of an upper layer sector piece, the gas circuit of the upper layer sector piece is connected with an upper layer gas collecting cavity, an upper layer gas collecting cavity is arranged on the upper layer sector ring, a.
Further, the external argon gas of argon gas connector one end in the built-in gas circuit of lower floor, the other end and the bottom plate annular cavity of argon gas connector communicate with each other, be provided with 8 holes on the bottom plate annular cavity, 8 holes communicate with each other with the hole of 8 lower floor's pieces that rise respectively, and argon gas passes through the piece that rises of lower floor gets into lower floor's fan-shaped piece gas circuit, be connected with the breather pipe on the fan-shaped piece gas circuit of lower floor, be provided with a plurality of equipartition apertures on the breather pipe, argon gas blows to the work piece.
The invention also provides a using method of the welding device for the double-weld expansion center support argon arc welding, which is characterized in that when in use, the lower flange of the shell is placed on a bottom plate of the welding device, and the lower flange is fastened by adopting the lower pressing plate component; after the lower flange is fastened, the cylindrical part is placed above the lower flange, the long rod nut is rotated, the long rod nut presses the cone on the positioning shaft to move downwards, the cone drives the lower-layer expansion block to be opened outwards, and at the moment, the lower-layer sector ring supports the lower edge of the cylindrical part tightly; rotating the upper-layer folding nut to drive the upper-layer expansion block to move outwards so as to drive the upper-layer sector ring to tightly support the upper edge of the cylindrical part, wherein the upper-layer expansion core mechanism and the lower-layer expansion core mechanism are concentric; the upper flange of the front section shell is arranged above the cylindrical part, the upper flange is tightly pressed by the upper laminated plate assembly, the upper flange is well attached to the welding line of the cylindrical part, argon is introduced into a built-in gas path of the welding device, and welding is carried out when the argon completely penetrates through the double-layer welding line.
Compared with the prior art, the invention has at least the following beneficial effects:
the welding device provided by the invention is efficient and practical, and can solve the problem of assembly welding of the shell assemblies at the front sections of various types of outer ducts; the assembly difficulty of the welding assembly is solved, the cylindrical part which is originally easy to deform into the middle section of the elliptical ring is supported by the expansion block to be round, the rapid assembly is guaranteed, the manual adjustment time is greatly shortened, the welding assembly is fast, the operation is convenient, the welding quality is good, the welding difficulty is overcome, the cylindrical part which is originally easy to deform into the elliptical ring is supported by the expansion block to be round, the rapid assembly is guaranteed, the manual adjustment time is greatly shortened, and the welding assembly fixture is suitable for popularization and application.
The welding device provided by the invention adopts a double-layer core expanding structure, the lower layer core expanding mechanism is provided with a long rod nut, and the long rod nut extends out of the upper layer core expanding mechanism to operate and control the opening and closing of the lower layer core expanding mechanism; the upper layer core expanding mechanism adopts a mode of adding a hollow positioning shaft and an upper layer split nut to control the opening and closing of the upper layer core expanding mechanism, and the upper layer core expanding mechanism and the lower layer core expanding mechanism can be effectively and separately operated by adopting the arrangement.
Furthermore, the welding device provided by the invention is also provided with the upper and lower layers of built-in gas circuits, is concise in appearance and easy to operate, can prevent welding seams from being oxidized, and ensures the quality of the welding seams.
Furthermore, the parts to be welded of the upper and lower core expanding mechanisms are embedded with fan-shaped rings, so that good heat dissipation of welding seams is ensured, and welding deformation is prevented.
Drawings
FIG. 1 is a characteristic view of a front-section shell of an outboard duct;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a two-dimensional engineering schematic of the present invention;
FIG. 4 is a schematic structural view of a lower core expanding mechanism of the present invention;
FIG. 5 is a schematic view of a long rod nut of the present invention;
FIG. 6 is a schematic structural view of an upper core expanding mechanism according to the present invention;
FIG. 7 is a schematic view of the hollow positioning shaft of the present invention;
FIG. 8 is a schematic view of the internal air passages of the present invention;
FIG. 8a is a schematic view of the lower built-in gas circuit of the present invention;
FIG. 8b is a schematic view of the upper layer built-in gas path of the present invention;
FIG. 8c is another side sectional view of the upper layer built-in gas circuit of the present invention;
FIG. 9 is a schematic view of the upper sector ring structure of the present invention;
in the drawings: 1 is a bottom plate, 2 is a lower pressing plate component, 3 is a positioning shaft, 4 is a long rod nut, 5 is a lower expanding core mechanism, 6 is a lower sector ring, 7 is a positioning support, 8 is a hollow positioning shaft, 9 is an upper split nut, 10 is an upper expanding core mechanism, 11 is an upper sector ring, 12 is an upper pressing plate component, 13 is a built-in air channel component, 1101 is an upper flange, 1102 is a cylindrical part, 1103 is a lower flange, 401 is a cone, 402 is a lower expanding block, 403 is a guide plate, 501 is a hexagon, 503 is a long rod nut shaft shoulder, 504 is an internal thread, 601 is an upper expanding block, 602 is an upper supporting plate, 701 is a first step shaft, 702 is a second step shaft, 703 is a third step shaft, 704 is a hollow positioning shaft shoulder, 705 is a through hole, 801 is an argon gas connector, 802 is a bottom plate annular cavity, 803 is a lower sector air channel, 804 is an upper supporting plate annular cavity, 806 is an upper sector air channel, 807 is an upper layer gas-collecting cavity, 808 is a steel pipe, 901 is a fan-shaped piece, 902 is a baffle plate, and 904 is a gas-collecting ring.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 2 to 7, the welding device is a double-layer core expansion structure, the diameter of the welding device is 1500 mm, the welding device comprises a lower-layer core expansion mechanism 5, an upper-layer core expansion mechanism 10 and a long-rod nut 4 arranged between the lower-layer core expansion mechanism 5 and the upper-layer core expansion mechanism 10, a positioning bracket 7 is arranged on the lower-layer core expansion mechanism 5, the upper-layer core expansion mechanism 10 is supported by the positioning bracket 7, a hollow positioning shaft 8 is arranged in the center of the upper-layer core expansion mechanism 10, a through hole 705 is arranged in the center of the hollow positioning shaft 8, an upper-layer split nut 9 is arranged on the outer side of the hollow positioning shaft 8, and the upper-layer split nut 9 is used for controlling the opening and closing of the upper; the center of the lower-layer core expansion mechanism 5 is provided with a positioning shaft 3, the lower end of a long rod nut 4 is connected with the positioning shaft 3, the upper end of the long rod nut 4 extends out of a through hole 705 on a hollow positioning shaft 8, and the long rod nut 4 is used for controlling the opening and closing of the lower-layer core expansion mechanism 5.
Preferably, as shown in fig. 5, the rod nut 4 is a stepped shaft, the total length is 574 mm, the rod nut 4 is an operating part of the lower-layer core expanding mechanism 5, the total length of the rod nut 4 exceeds the upper part of the hollow positioning shaft 8 of the upper-layer core expanding mechanism 10, the rod nut is just exposed out of the upper-layer core expanding mechanism 10, and the exposed part is provided with a hexagon 501, so that the rod nut 4 can be operated by a wrench, the inner surface of the lowest end of the rod nut 4 is provided with an internal thread 504, and the rod nut 4 is sleeved on the positioning shaft 3 and is in threaded connection with the positioning shaft 3; the long rod nut 4 is provided with an inner thread 504, one end of the long rod nut is also provided with a protruding long rod nut shaft shoulder 503, a cone 401 is arranged outside the positioning shaft 3, and the long rod nut shaft shoulder 503 is used for hanging the cone 401 and driving the pressing cone 401 to slide up and down, so that the opening and closing of the lower layer core expanding mechanism 5 are realized.
Furthermore, holes can be uniformly distributed in the radial direction of the part of the long rod nut 4 exposed out of the upper-layer core expanding mechanism 10, and the hole pulling pin is used for operation.
Preferably, as shown in fig. 6 and 7, the hollow positioning shaft 8 is a stepped shaft, and includes a first stepped shaft 701, a second stepped shaft 702 and a third stepped shaft 703, the hollow positioning shaft 8 is formed in one step, an external thread is provided on the outer surface of the first stepped shaft 701, the upper-layer opening and closing nut 9 is in threaded connection with the first stepped shaft 701, the second stepped shaft 702 is used for playing a role of positioning a center for the upper-layer core expanding mechanism 10, the centers of the third stepped shaft 703 and the upper-layer core expanding mechanism 10 are on the same axis, a hollow positioning shaft shoulder 704 is provided at the bottom of the third stepped shaft 703, and the hollow positioning shaft shoulder 704 is connected with the upper-layer core expanding mechanism 10.
Preferably, as shown in fig. 3 and fig. 4, a bottom plate 1 of the lower layer core expanding structure is provided with a centering spigot for positioning a lower flange 1103, a lower pressing plate assembly 2 is arranged on an outer ring of the bottom plate 1, the lower pressing plate assembly 2 is used for pressing the lower flange 1103, the lower layer core expanding mechanism 5 comprises the bottom plate 1, the bottom plate 1 is in shaft fit with a hole of a positioning shaft 3, and the positioning shaft 3 is in threaded connection with the bottom plate; the outer ring of the bottom plate 1 is provided with a lower pressing plate component 2, and the lower pressing plate component 2 is used for fixedly pressing the lower flange 1103; a plurality of positioning brackets 7 are symmetrically arranged in the bottom plate 1, two pin holes are formed in the bottom of each positioning bracket 7 and matched with the two pin holes in the bottom plate 1, and the positioning brackets 7 are used for supporting the upper layer core expanding mechanism 10 and ensuring that the circle centers of the lower layer core expanding mechanism 5 and the upper layer core expanding mechanism 10 are on the same axis; a cone 401 is sleeved on the positioning shaft 3, the cone 401 has eight connecting surfaces, each connecting surface of the cone 401 is connected with a lower-layer expansion block 402, a guide plate 403 is arranged on the lower-layer expansion block 402, the lower-layer expansion block 402 is connected with a lower-layer sector ring 6 to form a lower-layer circle supporting component, the lower-layer circle supporting component is used for supporting a circle of a cylindrical part 1102, and the eight guide plates 403 limit the eight lower-layer expansion blocks 402 to move centripetally and play a role in limiting; rotatory stock nut 4 can drive cone 401 and slide down, 8 lower floor of cone 401 extrusion piece 402 that rises greatly outwards, prop up cylindric 1102, make cylindric 1102 become the circle and with the lower floor 5 concentricity that rises heart structure, and be connected with a lower floor's sector ring 6 on every lower floor piece 402 that rises, the material of lower floor's sector ring 6 is copper, the heat dissipation is good when adopting copper's sector ring to guarantee to weld, in addition there is argon protection, can further ensure that the welding seam warp for a short time.
Preferably, as shown in fig. 6 and 9, the upper layer support plate 602, the hollow positioning shaft 8, the upper layer split nut 9, the upper layer sector ring 11 and the upper layer laminated plate assembly 12 of the upper layer core expanding mechanism are all arranged to be concentric with the lower layer core expanding mechanism 5. The upper layer core expanding mechanism 10 and the lower layer core expanding mechanism 5 have the same function and are used for ensuring the quality of the upper layer welding seam; the upper support plate 602 is arranged on the positioning bracket 7 and fixedly connected with the positioning bracket 7, an upper laminated plate assembly 12 is arranged on the outer ring of the upper support plate 602, and the upper laminated plate assembly 12 is used for fixedly pressing the upper flange 1101; a hollow positioning shaft 8 is arranged in the center of the upper support plate 602, and the hollow positioning shaft 8 and the upper support plate 602 are fixed through screws; the hollow positioning shaft 8 is in threaded connection with an upper-layer split nut 9, an upper-layer cone is sleeved on the upper- layer split nut 9, 8 upper-layer expansion blocks 601 are connected to the upper-layer cone, an upper-layer guide plate is arranged on the upper-layer expansion blocks 601, the upper-layer expansion blocks 601 are connected with an upper-layer sector ring 11 to form an upper-layer circle supporting component, the upper-layer split nut 9 is an operating piece of an upper-layer expansion core mechanism 10, the upper-layer split nut 9 drives the 8 expansion blocks 601 to expand outwards after rotating to drive the upper-layer sector ring 11 to support the upper edge of a cylindrical piece 1102, and at the moment, the upper-layer and lower-layer expansion core mechanisms are concentric.
In particular, the thread diameter of the upper layer split nut 9 arranged on the upper layer core expanding mechanism 10 is larger than that of the long rod nut 4 connected with the lower layer core expanding mechanism 5, and the size of the upper layer cone is larger than that of the cone 401.
Furthermore, the four positioning brackets 7 are ties concentrically connected with the upper layer and the lower layer, each positioning bracket is provided with two pin holes matched with the two pin holes of the bottom plate 1 to ensure concentricity, a circular spigot is turned on the upper edge of the positioning bracket 7 in a combined mode, the upper layer support plate 602 of the upper layer core expanding mechanism 10 is fixed on the positioning bracket 7, and the upper layer core expanding mechanism 10 and the lower layer core expanding mechanism 5 are ensured to be concentric.
Fig. 8 is a schematic view of the internal air passage structure of the present invention. As shown in fig. 8, the welding device provided by the present invention is further provided with a built-in gas path, the built-in gas path is divided into an upper layer and a lower layer, the built-in gas path is not interfered with each other, the built-in gas path assembly 13 comprises an argon gas connector 801, a bottom plate annular cavity 802, a lower layer fan-shaped gas path 803, a vent pipe 804, an upper layer support plate annular cavity 805, an upper layer fan-shaped gas path 806, an upper layer gas collection cavity 807 and a steel pipe 808, wherein, as shown in fig. 8b and 8c, the argon gas connector 801 of the upper layer built-in gas path is arranged on the lower layer core expanding mechanism 5, one end of the argon gas connector 801 is externally connected with argon gas, the other end of the argon gas connector 801 is connected with the steel pipe 808, the steel pipe 808 is connected with the upper layer support plate annular cavity 805, the steel pipe 808 leads the argon gas from the lower layer core expanding mechanism 5 to the upper layer core expanding mechanism 10, an upper-layer gas collecting cavity 807 is arranged on the upper-layer fan-shaped ring 11, a plurality of uniformly distributed small holes are formed in the upper-layer gas collecting cavity 807, and argon is blown to a welding line through the small holes to protect the welding line from being oxidized.
Further, as shown in fig. 8a, one end of an argon gas nozzle 801 in the lower-layer built-in gas path is externally connected with argon gas, the other end of the argon gas nozzle 801 is communicated with a bottom-plate annular cavity 802, 8 holes are formed in the bottom-plate annular cavity 802, the 8 holes are respectively communicated with holes in 8 lower-layer expansion blocks 402, the argon gas enters a lower-layer fan-shaped piece gas path 803 through the lower-layer expansion blocks 402, a vent pipe 804 is connected to the lower-layer fan-shaped piece gas path 803, a plurality of uniformly distributed small holes are formed in the vent pipe 804, and the argon gas is.
Fig. 9 is a schematic structural diagram of an upper sector ring of the present invention, and as shown in fig. 9, the upper sector ring 11 includes a sector 901, a baffle 902 and a gas collecting ring 904, the sector 901 is made of brass, the sector 901 is embedded in the upper expansion block 601, and a weld is provided with an annular shallow groove and uniformly distributed small holes; an annular shallow groove is machined on an upper support plate 602 of the upper-layer core expanding mechanism 5, an annular cavity 805 of the upper support plate is formed on the annular shallow groove by covering a gas collecting ring 904, 8 gas outlets are formed in the gas collecting ring 904, and the 8 gas outlets and 8 upper-layer expanding blocks 601 are connected into the upper-layer expanding blocks 601 in a one-to-one correspondence manner and argon is introduced into the upper-layer expanding blocks 601; an upper-layer gas collecting cavity 807 is arranged on the fan-shaped part 901, the upper-layer gas collecting cavity 807 is manufactured by turning, blocking pieces 902 are fixed on two sides of the fan-shaped part 901 through screws, and channels on two sides of the upper-layer gas collecting cavity 807 are closed by the blocking pieces 902, so that argon gas is prevented from leaking from the blocking pieces 902.
Further, as shown in fig. 6 and 9, the upper laminate assembly 12 is screwed on the upper rising block 601, the screws press the upper laminate assembly 12, and the upper laminate assembly 12 presses the upper flange 1101 from the axial direction, i.e., the upper laminate assembly 12 is pressed vertically downward, so as to ensure that the welding seams of the upper flange 1101 and the cylindrical member 1102 are well jointed.
The use method of the welding device provided by the invention specifically comprises the following steps:
FIG. 1 is a characteristic schematic view of a certain overburden forward section shell, such as the shell shown in FIG. 1 having a diameter of 1341.5 mm, a diameter of 481 mm, and a wall thickness of 1.5 mm; the weld is made up of three parts, an upper flange 1101, a barrel 1102 and a lower flange 1103. The middle cylindrical part 1102 is a sheet metal part, is formed by rolling, has large diameter tolerance, is an ellipsoid in a natural state, is easy to deform during welding, and needs to be rounded by a core expanding method.
During welding, the lower flange 1103 of the shell is placed on a positioning surface of a bottom plate 1 of a welding device, the lower flange 1103 is centered by a positioning spigot, and the lower flange 1103 is fastened by a lower pressing plate assembly 2; after the lower flange 1103 is fastened, the cylindrical part 1102 is placed above the lower flange 1103, the long rod nut 4 is rotated, the long rod nut 4 presses the cone 401 on the positioning shaft 3 to move downwards, the cone 401 drives the lower expansion block 402 to be opened outwards, and at the moment, the lower fan-shaped ring 6 tightly supports the lower edge 1102 of the cylindrical part; the upper-layer folding nut 9 is rotated to drive the upper-layer expanding block 601 to move outwards, so that the upper-layer sector ring 11 is driven to tightly support the upper edge of the cylindrical part 1102, and at the moment, the upper-layer expanding core mechanism and the lower-layer expanding core mechanism are concentric; installing the upper flange 1101 of the front section shell above the cylindrical part 1102, centering the upper flange 1101 by using the upper support plate 602, pressing the upper flange 1101 tightly by using the upper laminated plate assembly 12 to ensure that the welding seams of the upper flange 1101 and the cylindrical part 1102 are well jointed, introducing argon gas into a built-in gas path of a welding device, welding when the argon gas is completely penetrated through the double-layer welding seams, rotating the long rod nut 4 and the upper split nut 9 after welding, and withdrawing the lower expansion block 402 and the upper expansion block 601 by virtue of a spring mechanism arranged in the lower expansion block. The device is efficient, practical, safe and reliable, and solves the problem of argon arc welding of double welding seams of large thin-wall annular parts. This type of welding is a typical problem of engine overbank welding and has great promotional value.
Claims (10)
1. The welding device for argon arc welding is used for double-weld joint core expanding support and is characterized by comprising a lower-layer core expanding mechanism (5), an upper-layer core expanding mechanism (10) and a long-rod nut (4) arranged between the lower-layer core expanding mechanism (5) and the upper-layer core expanding mechanism (10), wherein the centers of the lower-layer core expanding mechanism (5) and the upper-layer core expanding mechanism (10) are on the same axis, a hollow positioning shaft (8) is arranged at the center of the upper-layer core expanding mechanism (10), a through hole (705) is formed in the center of the hollow positioning shaft (8), an upper-layer split nut (9) is installed on the outer side of the hollow positioning shaft (8), and the upper-layer split nut (9) is used for controlling the opening and closing of the upper-layer core expanding mechanism (10); the lower floor rises core mechanism (5) center and is provided with location axle (3), the lower extreme and the location axle (3) of stock nut (4) are connected, the upper end of stock nut (4) is stretched out from through-hole (705) on hollow location axle (8), stock nut (4) are used for controlling opening and shutting of lower floor rises core mechanism (5).
2. The welding device for the double-weld expanding center support argon arc welding according to claim 1, wherein the long rod nut (4) is a stepped shaft, the uppermost end of the long rod nut (4) is provided with a hexagon (501), the inner surface of the lowermost end of the long rod nut (4) is provided with an internal thread (504), the positioning shaft (3) is provided with an external thread, and the long rod nut (4) is in threaded connection with the positioning shaft (3); one end of the long-rod nut (4) provided with the internal thread (504) is provided with a protruding long-rod nut shaft shoulder (503), a cone (401) is arranged outside the positioning shaft (3), and the long-rod nut shaft shoulder (503) is used for hanging the cone (401) and driving the cone (401) to slide up and down so as to control the opening and closing of the lower-layer core expanding mechanism (5).
3. The welding device for the double-weld-seam center-expanding support argon arc welding according to claim 1, wherein the hollow positioning shaft (8) is a stepped shaft and comprises a first stepped shaft (701), a second stepped shaft (702) and a third stepped shaft (703), the hollow positioning shaft (8) is formed in one step, external threads are arranged on the outer surface of the first stepped shaft (701), the upper-layer split nut (9) is in threaded connection with the first stepped shaft (701), the second stepped shaft (702) is used for playing a role of a positioning center for the upper-layer core expanding mechanism (10), the third stepped shaft (703) is concentric with the upper-layer core expanding mechanism (10), a hollow positioning shaft shoulder (704) is arranged at the bottom of the third stepped shaft (703), and the hollow positioning shaft shoulder (704) is connected with the upper-layer core expanding mechanism (10).
4. The welding device for the double-weld-seam center-expanding support argon arc welding according to claim 1, wherein the lower-layer center-expanding mechanism (5) comprises a bottom plate (1), and the positioning shaft (3) is in threaded connection with the bottom plate (1); a lower pressing plate component (2) is arranged on the outer ring of the bottom plate (1), and the lower pressing plate component (2) is used for fixedly pressing a lower flange (1103); the bottom plate (1) is provided with a plurality of positioning brackets (7), the bottom of each positioning bracket (7) is provided with two pin holes matched with the two pin holes on the bottom plate (1), and the positioning brackets (7) support the upper-layer core expanding mechanism (10).
5. The welding device for the double-weld expanding center support argon arc welding according to claim 4, wherein a cone (401) is sleeved on the positioning shaft (3), the cone (401) has eight connecting surfaces, a lower expanding block (402) is connected to each connecting surface of the cone (401), a guide plate (403) is arranged on each lower expanding block (402), the lower expanding block (402) is connected with a lower sector ring (6) to form a lower circle supporting component, and the lower circle supporting component is used for supporting a cylinder (1102).
6. The welding device for the double-weld-seam center-expanding support argon arc welding according to claim 1, wherein the upper-layer center-expanding mechanism (10) further comprises an upper-layer support plate (602), the upper-layer support plate (602) is arranged on the positioning bracket (7) and fixedly connected with the positioning bracket (7), an upper laminated plate assembly (12) is arranged on the outer ring of the upper-layer support plate (602), and the upper laminated plate assembly (12) is used for fixedly pressing the upper flange (1101); the center of the upper layer support plate (602) is provided with a hollow positioning shaft (8), and the hollow positioning shaft (8) and the upper layer support plate (602) are fixed through screws.
7. The welding device for the argon arc welding for the double-weld expanding center support according to claim 6, wherein the hollow positioning shaft (8) is connected with the upper layer split nut (9) through an external thread, an upper layer cone is sleeved on the upper layer split nut (9), 8 upper layer expanding blocks (601) are connected on the upper layer cone, an upper layer guide plate is arranged on the upper layer expanding blocks (601), the upper layer expanding blocks (601) are connected with the upper layer sector ring (11) to form an upper layer circle supporting part, when the upper layer split nut (9) is rotated, the upper layer cone drives the 8 upper layer expanding blocks (601) to move outwards in a circumferential direction, so as to drive the upper layer sector ring (11) to tightly support the upper edge of the cylindrical part (1102), and the circle centers of the upper layer expanding center mechanism and the lower layer expanding center mechanism are on the same axis at the moment.
8. The welding device for the argon arc welding with the double-weld-seam core-expanding support as claimed in claim 6, wherein the welding device is further provided with a built-in gas path, the built-in gas path is divided into a built-in upper gas path and a built-in lower gas path, one end of an argon connecting nozzle (801) in the built-in upper gas path is externally connected with argon, the other end of the argon connecting nozzle (801) is connected with a steel pipe (808), the steel pipe (808) is connected with an upper supporting plate annular cavity (805), the steel pipe (808) is used for leading argon from a lower core-expanding mechanism (5) to an upper core-expanding mechanism (10), the upper supporting plate annular cavity (805) is connected with an upper fan-shaped piece gas path (806), the upper fan-shaped piece gas path (806) is connected with an upper gas collecting cavity (807), the upper fan-shaped ring (11) is provided with an upper gas collecting cavity (807), and the upper gas collecting cavity (807) is provided with a plurality of small holes, argon gas is blown to the welding seam through the small hole.
9. The welding device for the argon arc welding for the double-weld expansion center support according to claim 8, wherein one end of an argon connecting nozzle (801) in a lower-layer built-in gas path is externally connected with argon, the other end of the argon connecting nozzle (801) is communicated with a bottom-plate annular cavity (802), 8 holes are formed in the bottom-plate annular cavity (802), the 8 holes are respectively communicated with holes in 8 lower-layer expansion blocks (402), the argon enters a lower-layer sector gas path (803) through the lower-layer expansion blocks (402), a vent pipe (804) is connected to the lower-layer sector gas path (803), a plurality of uniformly distributed small holes are formed in the vent pipe (804), and the argon is blown to a workpiece through the small holes.
10. Use of a welding device according to any one of claims 1-9, characterized in that, in use, the lower flange (1103) of the housing is placed on the base plate (1) of the welding device, and the lower flange (1103) is fastened with the lower platen assembly (2); after the lower flange (1103) is fastened, the cylindrical part (1102) is placed above the lower flange (1103), the long rod nut (4) is rotated, the long rod nut (4) presses the cone (401) on the positioning shaft (3) to move downwards, the cone (401) drives the lower expansion block (402) to be opened outwards, and at the moment, the lower fan-shaped ring (6) tightly supports the lower edge of the cylindrical part (1102); the upper-layer folding nut (9) is rotated to drive the upper-layer expanding block (601) to move outwards, so that the upper-layer sector ring (11) is driven to tightly support the upper edge of the cylindrical part (1102), and at the moment, the upper-layer expanding core mechanism and the lower-layer expanding core mechanism are concentric; an upper flange (1101) of the front-section shell is arranged above the cylindrical part (1102), the upper flange (1101) is pressed tightly by an upper laminated plate assembly (12), the good joint of the welding seams of the upper flange (1101) and the cylindrical part (1102) is ensured, argon is introduced into a built-in gas path of a welding device, and the welding is carried out when the argon completely penetrates through the double-layer welding seam.
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