CN110666439A - Inner support device and method for preventing deformation of cylinder outer part during welding and heat treatment - Google Patents
Inner support device and method for preventing deformation of cylinder outer part during welding and heat treatment Download PDFInfo
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- CN110666439A CN110666439A CN201911008706.1A CN201911008706A CN110666439A CN 110666439 A CN110666439 A CN 110666439A CN 201911008706 A CN201911008706 A CN 201911008706A CN 110666439 A CN110666439 A CN 110666439A
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- cone
- frustum
- cones
- slideway
- outer part
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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
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention discloses an inner support device and a method for preventing deformation of a cylinder outer part during welding and heat treatment, belonging to the field of welding application of a small-diameter cylinder outer part; the inner supporting device comprises a frustum, an inner cone-dividing slideway, a supporting cylinder and a discharging round bar; the inner cone slideway is of a circular plate-shaped structure, and a through hole is formed in the center of the inner cone slideway; a plurality of radial rectangular through grooves are uniformly distributed on one end face of the inner cone dividing slideway along the circumferential direction, the other end face of the inner cone dividing slideway is of a flat plate structure, and the supporting cylinder is coaxially arranged on the flat plate face of the inner cone dividing slideway; the inner cones of the fan-shaped boss structures are coaxially arranged on the inner cone dividing slide ways, and the cone angles of the frustum and the inner cones are the same; the small-diameter end of the frustum is coaxially inserted into the large-diameter end of the inverted cone surface formed by the plurality of inner sub cones. The invention has fewer structural parts and simple structure, adopts the unloading round bar to be wedged and installed from the big end of the frustum, and applies pressure to disassemble from the small end of the frustum, so that the installation and the convenient operation are simple and convenient.
Description
Technical Field
The invention belongs to the field of welding application of small-diameter cylinder outer parts, and particularly relates to an inner support device and method for preventing deformation of the cylinder outer parts during welding and heat treatment.
Background
Welding and heat treatment deformation prevention of the outer part of the small-diameter cylinder are one of the problems of common application in the field of welding. In order to solve the problem, the existing tool mainly has the following two forms: a workpiece in the form of a round rod or cylinder and cylinder of fixed diameter is fitted with a certain interference, using the rigidity of the tooling to minimize the deformation of the outer part during welding and heat treatment, to a controlled extent as shown in figure 1. The method is characterized by mainly comprising the following steps: the rigid cylinder 2 is pressed into the cylindrical workpiece 3, and the rigid cylinder 2 and the cylindrical workpiece 3 have certain interference. During the welding of the outer member 1, welding deformation is generated in the weld portion. Due to the support of the rigid cylinder, stress concentrations are locally generated inside the workpiece. The tool and the workpiece are subjected to heat treatment together, stress concentration is eliminated, and the shape precision requirement of the workpiece is ensured. The main disadvantages of the tool are as follows: the tooling and the workpieces are in one-to-one correspondence, and each type of tooling corresponds to a cylindrical workpiece with one size; because each cylindrical workpiece has certain dimensional tolerance in the manufacturing process, the fit tolerance of the rigid cylinder 2 and the cylindrical workpiece 3 is difficult to guarantee; the matching of the rigid cylinder 2 and the cylindrical workpiece 3 has certain interference, so the tool is difficult to disassemble. Another form is a local adjustment type internal support as shown in fig. 2, which is characterized in that: the supporting arc block 5 is pressed by adjusting different positions of the puller bolt 6 on the circular ring support 4, and the supporting arc block 5 supports the local part of the cylindrical workpiece 3. The defects are mainly as follows: the supporting arc block 5 needs to be adjusted one by one, and the operation is troublesome; the tool components are in threaded fit, so heat treatment is not suitable. If the tool is used for heat treatment, parts with threads need to be replaced in time, so that great waste is caused; the tooling is not suitable for operation in small diameter cylinders.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides an inner supporting device and a method for preventing deformation of the cylinder outer part during welding and heat treatment.
The technical scheme of the invention is as follows: the utility model provides a be used for welding of drum outer part, heat treatment to prevent internal stay device of deformation which characterized in that: comprises a frustum, an inner cone slideway, a supporting cylinder and a discharging round bar; the inner cone slideway is of a circular plate-shaped structure, and a through hole is formed in the center of the inner cone slideway and used for inserting the discharging round rod; a plurality of radial rectangular through grooves are uniformly distributed on one end face of the inner cone dividing slide way along the circumferential direction, the other end face of the inner cone dividing slide way is of a flat plate structure, the supporting cylinder is of a tubular structure with two open ends and is coaxially arranged on the flat plate face of the inner cone dividing slide way, and the inner diameter of the supporting cylinder is larger than the diameter of the through hole of the inner cone dividing slide way; the discharging round rod is cylindrical, and the outer diameter of the discharging round rod is smaller than the diameter of the through hole of the inner tapered slideway and the inner diameter of the supporting cylinder;
the frustum is of a conical boss structure; the inner cone is of a fan-shaped boss structure, a lug is arranged on the bottom end face of the inner cone, and the lug is matched with the rectangular through groove on the inner cone slideway for installation, so that the inner cone can slide in the rectangular through groove along the radial direction of the inner cone slideway; the inner branched cones are coaxially arranged on the inner branched cone slide ways, and the fan-shaped inner cambered surfaces of the inner branched cones are positioned on the same peripheral surface to form inverted conical surfaces which are used for being matched with the conical surfaces of the frustum cone; the fan-shaped outer cambered surfaces of the inner sub-cones are positioned on the same peripheral surface to form a cylindrical surface for supporting a cylindrical workpiece to be processed; the number of the inner sub-cones is the same as that of the rectangular through grooves on the inner sub-cone slide ways; the cone angle of the frustum is the same as that of the inner cone; the small-diameter end of the frustum is coaxially inserted into the large-diameter end of the inverted cone surface formed by the plurality of inner sub cones.
The further technical scheme of the invention is as follows: the cone angle theta of the frustum and the inner cone is 10-14 degrees.
The further technical scheme of the invention is as follows: the frustum and the inner cone are made of steel.
The further technical scheme of the invention is as follows: the number of the inner sub-cones and the number of the rectangular through grooves on the inner sub-cone slide ways are both 4.
The further technical scheme of the invention is as follows: the central angle of the inner partial cone is 80 degrees.
The further technical scheme of the invention is as follows: the width of the lug of the inner cone is smaller than the width of the rectangular through groove of the inner cone slideway, and the height of the lug of the inner cone is larger than the depth of the rectangular through groove of the inner cone slideway.
A use method of an inner support device for preventing deformation of the outer part of a radial cylinder during welding and heat treatment is characterized by comprising the following specific steps:
the method comprises the following steps: a plurality of inner sub-cones are coaxially and respectively arranged on the inner sub-cone slideways, and the convex blocks of each inner sub-cone are correspondingly arranged in the rectangular through grooves on the inner sub-cone slideways one by one;
step two: sleeving a processed cylindrical workpiece outside the installed inner partial cones and the installed inner partial cone slideways, so that the fan-shaped outer cambered surfaces of the inner partial cones are supported at the welding positions of the cylindrical workpiece and the outer part;
step three: coaxially inserting the small-diameter end of the frustum into the large-diameter end of the inverted conical surface formed by the plurality of inner sub-cones from one end of the processed cylindrical workpiece; then, the discharging round rod is used for applying pressure to the large-diameter end face of the frustum, so that the frustum generates axial displacement towards the other end of the processed cylindrical workpiece, and meanwhile, each inner cone is pushed to slide outwards along the radial direction of the cylindrical workpiece; when the frustum and the fan-shaped inner cambered surfaces of the inner partial cones and the fan-shaped outer cambered surfaces of the inner partial cones and the inner wall of the cylindrical workpiece are completely pressed, the support of the welding positions of the cylindrical workpiece and the outer part is completed.
Step four: when the tool is disassembled, the unloading round rod is inserted into the supporting cylinder, pressure is applied to the small-diameter end face of the frustum to enable the frustum to generate axial displacement towards one end of a processed cylinder workpiece, the frustum is pushed out from among the plurality of internal sub-cones, and the disassembly of the internal supporting device is completed.
Advantageous effects
The invention has the beneficial effects that: the inner supporting device adopts the design of the conical wedge, so that the design of a Chinese structure with a mechanical easily-damaged structure (such as a thread and other mechanical driving elements) in the prior art is avoided; the frustum and the inner cone of the invention adopt the module design, can be repeatedly utilized and used for processing cylindrical workpieces with different inner diameters, and solve the problem that the local adjustment type inner support in the background technology can not be repeatedly used in the heat treatment process; and the modularized design of the frustum and the inner cone can be widely applied to welding and heat treatment processes of cylinder outer parts with the diameter less than 200 mm.
The invention has fewer structural parts and simple structure, adopts the unloading round bar to be wedged and installed from the big end of the frustum, and applies pressure to disassemble from the small end of the frustum, so that the installation and the convenient operation are simple and convenient, and the problems that the rigid cylindrical interference inner support is difficult to disassemble due to the existence of interference magnitude in the background technology, and the workpiece is easy to damage due to improper operation in the disassembling process are solved; the inner support device is used in product welding and heat treatment, so that the welding deformation of the product is controlled, the roundness of the product is controlled within 0.3mm, and the product performance requirements are met.
The invention uses steel as a manufacturing material, and the friction coefficient mu of the steel is 0.15, the cone angle theta/2 is smaller than arctg (mu) under the self-locking condition, and the theta is 17 degrees, and the cone angles of the frustum and the inner cone of the invention are designed to be theta 10 degrees to 14 degrees through a large amount of experiments and calculations, so that the welding positions of the cylindrical workpiece and the outer part can be more accurately supported.
Drawings
FIG. 1 is a rigid cylindrical interference inner support in the background art;
FIG. 2 is a view of a partially adjustable inner support in the prior art;
FIG. 3 is a sectional cone type inner support of the present invention;
FIG. 4 is a schematic view of an internal tapered ramp of the present invention;
FIG. 5 is a schematic view of the inner sub-cone 1 of the present invention;
description of reference numerals: 1. the device comprises an outer part, 2 rigid cylinders, 3 cylindrical workpieces, 4 circular ring supports, 5 supporting arc blocks, 6 jacking bolts, 7 discharging circular rods, 8 supporting cylinders, 9 internal cone dividing slideways, 10 internal cone dividing slideways and 11 frustum tables.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 3, the internal supporting device for preventing deformation of the cylinder external part during welding and heat treatment comprises a discharging round bar 7, a supporting cylinder 8, an internal cone slideway 9, an internal cone 10 and a frustum 11;
the discharging round rod 7 is a cylindrical steel rod with the diameter of 40mm and the length of 440mm, and is made of a material Q235; the discharging round bar 7 is used for installing and tamping and disassembling the inner support device.
The support cylinder 8 is a cylinder of internal diameter 69mm, external diameter 89mm and length 259 mm. Material Q235. The end faces of the two circular rings are required to be parallel and perpendicular to the axial direction. The support cylinder 8 is used to support the entire assembly, pushing the inner bracing assembly into the welding position of the outer part 1 where the cylindrical workpiece 3 needs to be controlled for deformation.
Referring to fig. 4, the inner cone slideway 9 is a circular truncated cone with an inner diameter of 50mm, an outer diameter of 140mm and a height of 30mm, a through hole is arranged at the center, four radial rectangular through grooves are uniformly distributed on the end surface of the upper circular ring along the circumferential direction, a plurality of rectangular through grooves are formed in a radial shape by taking the middle point of the inner cone slideway as the center of a circle, and the rectangular through grooves have a groove width of 30mm and a depth of 10mm and are used as the slideway of the inner cone 10. The material of the inner tapered runner 9 is Q235. The bottom surface of the rectangular through groove is parallel to the lower annular surface of the inner cone slideway 9. The inner cone dividing slideway 9 is mainly used for uniformly dividing each inner cone 10 of the cone 4 along the radial direction of the circular truncated cone, and reducing the friction force between the inner cone dividing slideway 9 and the inner cone dividing slideway 10.
Referring to fig. 5, the inner cone 10 is a sector boss structure, and the central angle is 80 degrees; the 4 inner cones 10 are coaxially arranged on the inner cone slideway 9, and the fan-shaped inner cambered surfaces of the inner cones 10 are positioned on the same peripheral surface to form an inverted cone surface which is used for being matched with the conical surface of the frustum 11; the fan-shaped outer cambered surfaces of the inner sub-cones 10 are positioned on the same peripheral surface to form a cylindrical surface and are used for supporting the cylindrical workpiece 3 to be processed; the inner cone angle of the inner cone 10 is 14 degrees, the outer circle diameter is 162mm, and the cylinder height is 160 mm; a lug is arranged on the bottom end face of the inner tapping cone 10 and is matched with the rectangular through groove on the inner tapping cone slide way 9, so that the inner tapping cone 10 can slide in the rectangular through groove along the radial direction of the inner tapping cone slide way 9; the convex blocks are symmetrically arranged left and right by using the central line of the sector, the width of each convex block is 30mm, the convex blocks extend from the inner arc of the sector of the bottom end surface to the outer arc of the sector, and the height of each convex block is 20 mm. The large-diameter end of the inverted cone surface where the fan-shaped inner arc surfaces of the four inner cones 10 are located is the top end, and the small-diameter end is the bottom end. The material of the inner cone 10 is Q235. After the frustum 11 is pressed down along the axial direction of the cylindrical workpiece 3, the inner cone 10 is uniformly separated along the inner cone slideway 9 in the cylindrical workpiece 3 along the radial direction, the inner wall of the cylindrical workpiece 3 is tightly supported, and the welding deformation part is rigidly restrained.
The frustum 11 is a conical boss structure, the diameter of the small-diameter end is 85mm, the taper angle is 14 degrees, the height is 170mm, and the material is Q235. When the conical table 11 is installed, the small-diameter end is pressed downwards into the large end of the conical surface of the 4 inner sub-cones 10 along the axis direction of the cylindrical workpiece 3, the 4 inner sub-cones are uniformly separated from the cylindrical workpiece 3 along the 4 rectangular through grooves of the inner sub-cone slideway 9 in the radial direction, the outer diameter of the 4 inner sub-cones 10 is tightly propped against the inner wall of the cylindrical workpiece 3, and the welding part of the outer part 1 is rigidly restrained.
Tool installation process and overall requirements. The cylindrical workpiece 3 in this embodiment has an inner diameter of 162mm, a wall thickness of 9mm and a height of 439 mm. During installation, the supporting cylinder 8 is placed on the platform, the inner cone slideway 9 is placed on the upper end face of the supporting cylinder 8, the protruding blocks at the bottom of the four inner cones 10 are matched with the four slideways of the inner cone slideway 9, the gap of the matched single side face is 0.5mm, and the four inner cones 10 are attached to the center as far as possible along the radial direction of the cylinder workpiece 3, so that the inner diameter of the cylinder workpiece 3 can smoothly penetrate through the position with the largest size after the four inner cones 10 are combined. And (3) sleeving the cylindrical workpiece 3 into the tool, attaching the end surface of the cylinder to the platform, and aligning the heights of the outer circular surfaces of the four inner sub-cones 10 with the welding position of the outer part 1. At the moment, the small-diameter end of the frustum 11 is placed into the large-diameter end of the inner conical surface of the four inner branched cones 10 from the upper opening of the cylindrical workpiece 3, the frustum 11 is hammered tightly by the unloading round bar 7, the four inner branched cones 10 are pushed away from the cylindrical workpiece 3 along the inner branched cone slide ways 9 in the downward pressing process of the frustum 11, the outer diameter of the inner branched cone 10 is attached to the inner wall of the cylindrical workpiece 3, and the position of the cylindrical workpiece 3, which is welded with the outer part 1, is tightly supported. Because the conical table 11 and the four inner partial cones 10 are matched with the conical surface with the same taper and the taper is a self-locking angle, the local stress generated by welding the outer part 1 after the installation of the partial cone type inner support is not enough to change the rigid constraint force generated by the partial cone type inner support, and the local deformation of the cylindrical workpiece 3 is in a controllable range. In the subsequent heat treatment process, the local stress is eliminated in the heat treatment process, and the welding part of the cylindrical workpiece 3 recovers the original shape under the rigid constraint of the cone-dividing type inner support.
When the tool is disassembled, the unloading round rod 7 is inserted into the supporting cylinder 8, pressure is applied to the small-diameter end face of the frustum 11, so that the frustum 11 generates axial displacement towards one end of a processed cylinder workpiece, the frustum 11 is pushed out from among the 4 internal cones, and the disassembly of the internal support device is completed.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (7)
1. The utility model provides a be used for welding of drum outer part, heat treatment to prevent internal stay device of deformation which characterized in that: comprises a frustum, an inner cone slideway, a supporting cylinder and a discharging round bar; the inner cone slideway is of a circular plate-shaped structure, and a through hole is formed in the center of the inner cone slideway and used for inserting the discharging round rod; a plurality of radial rectangular through grooves are uniformly distributed on one end face of the inner cone dividing slide way along the circumferential direction, the other end face of the inner cone dividing slide way is of a flat plate structure, the supporting cylinder is of a tubular structure with two open ends and is coaxially arranged on the flat plate face of the inner cone dividing slide way, and the inner diameter of the supporting cylinder is larger than the diameter of the through hole of the inner cone dividing slide way; the discharging round rod is cylindrical, and the outer diameter of the discharging round rod is smaller than the diameter of the through hole of the inner tapered slideway and the inner diameter of the supporting cylinder;
the frustum is of a conical boss structure; the inner cone is of a fan-shaped boss structure, a lug is arranged on the bottom end face of the inner cone, and the lug is matched with the rectangular through groove on the inner cone slideway for installation, so that the inner cone can slide in the rectangular through groove along the radial direction of the inner cone slideway; the inner branched cones are coaxially arranged on the inner branched cone slide ways, and the fan-shaped inner cambered surfaces of the inner branched cones are positioned on the same peripheral surface to form inverted conical surfaces which are used for being matched with the conical surfaces of the frustum cone; the fan-shaped outer cambered surfaces of the inner sub-cones are positioned on the same peripheral surface to form a cylindrical surface for supporting a cylindrical workpiece to be processed; the number of the inner sub-cones is the same as that of the rectangular through grooves on the inner sub-cone slide ways; the cone angle of the frustum is the same as that of the inner cone; the small-diameter end of the frustum is coaxially inserted into the large-diameter end of the inverted cone surface formed by the plurality of inner sub cones.
2. The inner support device for preventing deformation of the cylinder outer part during welding and heat treatment according to claim 1, is characterized in that: the cone angle theta of the frustum and the inner cone is 10-14 degrees.
3. The inner support device for preventing deformation of the cylinder outer part during welding and heat treatment according to claim 1, is characterized in that: the frustum and the inner cone are made of steel.
4. The inner support device for preventing deformation of the cylinder outer part during welding and heat treatment according to claim 1, is characterized in that: the number of the inner sub-cones and the number of the rectangular through grooves on the inner sub-cone slide ways are both 4.
5. The inner support device for preventing deformation of the cylinder outer part during welding and heat treatment according to claim 1, is characterized in that: the central angle of the inner partial cone is 80 degrees.
6. The inner support device for preventing deformation of the cylinder outer part during welding and heat treatment according to claim 1, is characterized in that: the width of the lug of the inner cone is smaller than the width of the rectangular through groove of the inner cone slideway, and the height of the lug of the inner cone is larger than the depth of the rectangular through groove of the inner cone slideway.
7. The use method of the inner support device for preventing deformation of the outer part of the radial cylinder during welding and heat treatment in the claim 1 is characterized by comprising the following specific steps:
the method comprises the following steps: a plurality of inner sub-cones are coaxially and respectively arranged on the inner sub-cone slideways, and the convex blocks of each inner sub-cone are correspondingly arranged in the rectangular through grooves on the inner sub-cone slideways one by one;
step two: sleeving a processed cylindrical workpiece outside the installed inner partial cones and the installed inner partial cone slideways, so that the fan-shaped outer cambered surfaces of the inner partial cones are supported at the welding positions of the cylindrical workpiece and the outer part;
step three: coaxially inserting the small-diameter end of the frustum into the large-diameter end of the inverted conical surface formed by the plurality of inner sub-cones from one end of the processed cylindrical workpiece; then, the discharging round rod is used for applying pressure to the large-diameter end face of the frustum, so that the frustum generates axial displacement towards the other end of the processed cylindrical workpiece, and meanwhile, each inner cone is pushed to slide outwards along the radial direction of the cylindrical workpiece; when the frustum and the fan-shaped inner cambered surfaces of the inner partial cones and the fan-shaped outer cambered surfaces of the inner partial cones and the inner wall of the cylindrical workpiece are completely pressed, the support of the welding positions of the cylindrical workpiece and the outer part is completed.
Step four: when the tool is disassembled, the unloading round rod is inserted into the supporting cylinder, pressure is applied to the small-diameter end face of the frustum to enable the frustum to generate axial displacement towards one end of a processed cylinder workpiece, the frustum is pushed out from among the plurality of internal sub-cones, and the disassembly of the internal supporting device is completed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008706.1A CN110666439B (en) | 2019-10-23 | 2019-10-23 | Inner support device and method for preventing deformation of cylinder outer part during welding and heat treatment |
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| CN201911008706.1A CN110666439B (en) | 2019-10-23 | 2019-10-23 | Inner support device and method for preventing deformation of cylinder outer part during welding and heat treatment |
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| CN110666439B CN110666439B (en) | 2021-07-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111408893A (en) * | 2020-04-30 | 2020-07-14 | 中国航发哈尔滨东安发动机有限公司 | Self-centering expansion welding fixture |
| CN113523616A (en) * | 2020-04-16 | 2021-10-22 | 大族激光科技产业集团股份有限公司 | Laser welding tool equipment and laser welding method |
| CN113664279A (en) * | 2021-09-30 | 2021-11-19 | 山东科技大学 | False tail device with zero tail material during cutting of circular steel pipe along cross section and using method of false tail device |
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2019
- 2019-10-23 CN CN201911008706.1A patent/CN110666439B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523616A (en) * | 2020-04-16 | 2021-10-22 | 大族激光科技产业集团股份有限公司 | Laser welding tool equipment and laser welding method |
| CN111408893A (en) * | 2020-04-30 | 2020-07-14 | 中国航发哈尔滨东安发动机有限公司 | Self-centering expansion welding fixture |
| CN113664279A (en) * | 2021-09-30 | 2021-11-19 | 山东科技大学 | False tail device with zero tail material during cutting of circular steel pipe along cross section and using method of false tail device |
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| CN110666439B (en) | 2021-07-06 |
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