CN113829004A - Welding deformation control method for large-sized slotted welding impeller and slotted welding impeller - Google Patents
Welding deformation control method for large-sized slotted welding impeller and slotted welding impeller Download PDFInfo
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- CN113829004A CN113829004A CN202110995350.6A CN202110995350A CN113829004A CN 113829004 A CN113829004 A CN 113829004A CN 202110995350 A CN202110995350 A CN 202110995350A CN 113829004 A CN113829004 A CN 113829004A
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- welding
- groove body
- blade
- wheel disc
- impeller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a welding deformation control method of a large-scale slotted welding impeller and the slotted welding impeller, wherein the welding deformation control method comprises the steps of milling a first groove body corresponding to a blade on a wheel disc, milling a second groove body on one side of the first groove body, which is far away from the blade, and milling a welding slot into two parts, namely the first groove body and the second groove body; welding the wheel disc and the blades along the first groove body, filling the first groove body only to form a welding filling line in the first groove body, keeping the second groove body in an unfilled state to enable the filling amount of welding materials to reach the welding seam filling line, and enabling the second groove body to be used in a combined mode only for increasing the rigidity, wherein firstly, the wheel disc is thickened by increasing the allowance of the base metal, so that the rigidity of the base metal is increased, and the deformation resistance is improved; secondly, the filling amount of the welding seam is not increased, and the root cause of impeller deformation is reduced.
Description
Technical Field
The invention belongs to the technical field of centrifugal compressors, and particularly relates to a welding deformation control method for a large-scale slotted welding impeller and the slotted welding impeller.
Background
A slotting welded impeller is a welded impeller mode which solves the problem that welding can not be realized in a flow passage. Specifically, the blades are milled on the wheel cover, a groove is milled at the position, corresponding to the blades, on the wheel disc, the groove is reserved with a certain thickness, the groove bottom is not milled thoroughly, and the wheel cover wheel disc is assembled together through a positioning method, so that the groove bottom of the wheel disc is exactly corresponding to the positions of the blades below the groove bottom. And then argon arc welding (TIG) is used for carrying out bottom sealing welding on the bottom of the groove in a self-melting mode (without filling welding wires), the blade and the wheel disc are welded into a whole, and finally the groove part is completely filled.
The outer diameter of the slotted welding impeller is smaller and basically not more than 800mm, but in recent years, due to the appearance of a new model grade, the international market expands and the structural limitation of the impeller, the large diameter is caused, and the number of the slotted welding impellers with the outer diameter of more than 1m is increased suddenly. The larger the diameter is, the larger the deformation risk is, and if the conventional welding manufacturing mode of the small-diameter slot welding impeller is continued, the following problems can occur in the impeller production process: 1. when the impeller is roughly machined after stress relief, the part with a closed outer circle cannot be turned, and a flow channel cannot be exposed, so that a welding seam cannot be polished, and the size and the appearance of a welding leg of the welding seam cannot be checked; 2. the molded lines on the outer side of the wheel disc are often not machined enough after the impeller is subjected to heat treatment, the main appearance part is the outer side of the wheel disc, and the position is approximately in the range of one third to two thirds of the length of the blade at the air inlet of the blade; the problems such as the above are very troublesome to handle, because if the allowance of the outer side of the wheel disc is not enough, large-area repair welding can not be carried out on the whole disc surface, if the allowance is not enough, the drawing requirements can not be met, the local size is thin, the molded lines are not smooth, and some defects are scrapped even because the deformation is too large, so that huge economic loss is caused.
Although the above problems are caused by insufficient margin, the margin of the wheel disc is not so large, and the backing welding using argon arc welding (TIG) cannot be performed due to the insufficient length of the welding tip of the welding gun. One of the main reasons for the deformation is welding, and the increase of the allowance can increase the welding amount of the groove body, and the excessive welding amount is harmful to the impellers and is not beneficial to the impellers, but can cause the deformation to be more serious, so that the method for reasonably controlling the deformation is very important for the large-diameter slot-welded impeller.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a welding deformation control method of a large-scale slotted welding impeller and the slotted welding impeller.
The invention provides a welding deformation control method for a large-scale slotted welding impeller, which comprises the following steps:
milling blades on the wheel cover blank;
milling a first groove body corresponding to the blade on the wheel disc, and milling a second groove body on one side of the first groove body, which is far away from the blade;
and welding the wheel disc and the blade along the first groove body, filling the first groove body with the welded blade and the welded wheel disc.
Further, when the first groove body corresponding to the blade is milled on the wheel disc, the method includes:
determining the width value of the bottom of the first groove body according to the thickness value of the blade; the width value of the groove bottom of the first groove body is not smaller than the thickness value of the blade.
Further, when the first groove body corresponding to the blade is milled on the wheel disc, the method includes:
determining a slotting track and a slot bottom width value on the wheel disc according to the thickness value of the blade and the blade profile of the blade;
and slotting the wheel disc according to the determined slotting track and the width value of the groove bottom, so that a first groove body with an isosceles trapezoid cross section is formed on the wheel disc.
Further, the angles between the two side walls in the first groove body and the groove bottom are 75-80 degrees.
Further, when one side of the first groove body, which is far away from the blade, is milled with a second groove body, the method comprises the following steps:
and milling one side of the first groove body, which is far away from the blade, on the wheel disc to form a second groove body with a rectangular cross section on one side of the first groove body, which is far away from the blade.
Further, the central axis of the cross section of the second groove body is on the same straight line with the central axis of the cross section of the first groove body.
Furthermore, the width value of the second groove body is larger than that of the first groove body at one side far away from the groove bottom.
Further, the height of the second groove body is 3-5 mm.
Further, before milling the first groove body corresponding to the blade on the wheel disc, milling the outer side edge of the wheel disc to enable the outer side angle of the outer side edge of the wheel disc to be 3-4 degrees.
The invention provides a slotted welding impeller, which is processed by the method.
According to the welding deformation control method of the large-scale slotted welding impeller and the slotted welding impeller, the first groove body corresponding to the blade is milled on the wheel disc, the second groove body is milled on the side, far away from the blade, of the first groove body, and the welding slot is milled into two parts, namely the first groove body and the second groove body; welding the wheel disc and the blades along the first groove body, filling the first groove body only to form a welding filling line in the first groove body, keeping the second groove body in an unfilled state to enable the filling amount of welding materials to reach the welding seam filling line, and enabling the second groove body to be used in a combined mode only for increasing the rigidity, wherein firstly, the wheel disc is thickened by increasing the allowance of the base metal, so that the rigidity of the base metal is increased, and the deformation resistance is improved; secondly, the filling amount of the welding seam is not increased, and the root cause of impeller deformation is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a welding deformation control method for a large-sized slot-welded impeller according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic illustration of a prior art blade and disk construction prior to being welded;
FIG. 3 is a schematic illustration of a blade and disk configuration provided in accordance with an exemplary embodiment of the present invention prior to being unwelded
FIG. 4 is a schematic illustration of a prior art shroud and blade configuration;
FIG. 5 is a schematic illustration of a shroud and bucket configuration provided in accordance with an exemplary embodiment of the present invention;
FIG. 6 is a flow chart of another method of controlling weld distortion for a large slot welded impeller in accordance with an exemplary embodiment of the present invention;
FIG. 7 is a schematic structural view of a prior art wheel disc;
FIG. 8 is a schematic illustration of a wheel disc construction provided in accordance with an exemplary embodiment of the present invention;
fig. 9 is a schematic structural diagram of a wheel disc provided in an exemplary embodiment of the present invention.
Detailed Description
In order to overcome the defects in the prior art, the invention provides a welding deformation control method of a large-scale slotted welding impeller and the slotted welding impeller. In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a welding deformation control method of a large slotted welding impeller, which comprises the following steps, referring to fig. 1:
and S100, milling a blade on the wheel cover blank.
Simultaneously, in order to guarantee that wheel cap 1 and blade 2 are after eliminating stress, the runner can normally be turned on, does not have phenomenons such as burr, thin skin, still adjusts welding impeller's excircle allowance before welding and runner welding allowance, specifically includes: according to the invention, as shown in fig. 4, according to the standard of the pre-welding allowance of the welded impeller in the prior art, namely, the allowance of 12mm is reserved on the single side of the outer circle of the wheel disc 3 in comparison with the finish machining size, and the allowance of 7mm is reserved on the single side of the air outlet of the blade 2 in comparison with the finish machining size, as shown in fig. 5, for the welded impeller with the diameter of more than 1000mm, the single side of the outer circle of the wheel disc 3 in comparison with the finish machining size is reserved and adjusted to 15mm, and the allowance of the air outlet of the blade 2 is adjusted to 10mm on the single side.
S200, milling a first groove body corresponding to the blade on the wheel disc, and milling a second groove body on one side, far away from the blade, of the first groove body.
Specifically, when the welding blade of blade 2 mills out, mill out on rim plate 3 and mill out the first cell body 4 corresponding with blade 2, include: determining the width value of the bottom of the first groove body 4 according to the thickness value of the welding blade; wherein, the width of the bottom of the first trough body 4 is not less than the thickness of the blade, see fig. 3, the difference between the width of the bottom of the first trough body 4 and the thickness of the blade is 0.5 mm.
Further, referring to fig. 6, when the first groove corresponding to the blade is milled on the wheel disc, the method includes the following steps:
s201, determining a slotting track and a slot bottom width value on the wheel disc according to the thickness value of the welded blade and the blade profile of the blade.
S202, slotting the wheel disc according to the determined slotting track and the width value of the groove bottom, and enabling a first groove body with an isosceles trapezoid cross section to be formed on the wheel disc.
Specifically, referring to fig. 3, when backing welding is performed on the first groove body 4 and the blade 2 by argon arc welding (TIG), the welding tip cannot extend into the welding groove body due to the width of the welding tip of the welding gun, and therefore, it is preferable that the angles between the two side walls and the bottom of the groove in the first groove body 4 are both 75 to 80 °, so that the welding tip of the welding gun can smoothly extend into the first groove body 4, and it is preferable that the angles between the two side walls and the bottom of the groove are both 77.5 °.
Furthermore, when the second groove body is milled on the side of the first groove body far away from the blade, the milling device comprises:
and milling one side of the first groove body, which is far away from the blade, on the wheel disc to form a second groove body with a rectangular cross section on one side of the first groove body, which is far away from the blade. After only the first groove body is filled, the second groove body is in an unfilled state, and the rigidity of the impeller base body can be increased by the base material allowance formed by the second groove body and the welding filling line filled in the first groove body.
Specifically, the central axis of the cross section of the second groove body is on the same straight line with the central axis of the cross section of the first groove body.
Referring to fig. 3, the width of the second trough body 5 is greater than the width of the first trough body 4 on the side away from the bottom of the trough. After the first groove body 4 is filled, the width of the groove outside the welding filling line in the first groove body 4 is larger than that of the first groove body 4, so that the welding operation of the welding groove body consisting of the first groove body 4 and the second groove body 5 provided by the invention cannot be influenced by the depth of the groove, and meanwhile, the purchase size of raw materials cannot be increased, and the cost cannot be increased.
S300, welding the wheel disc and the blade along the first groove body, filling the first groove body with the welded blade and the wheel disc, and completing welding of the blade and the wheel disc.
Specifically, the height of the second groove body is 3-5 mm.
It should be noted that, in order to increase the rigidity of the impeller base body, the outer side dimension of the disk (see fig. 2 and 7) in the prior art needs to be increased to 10-13mm as shown in fig. 8. However, this method also brings about a corresponding problem that when the existing grooving welding standard is to fill the welding groove body 6 as shown in fig. 2 completely, the increased weight of the wheel disc 5 will result in the increase of the groove depth, and the welding amount will also be greatly increased, which is still beneficial to the impeller. Therefore, the welding grooving is milled into two parts, namely a first groove body 4 and a second groove body 5, the wheel disc 3 and the blade 2 are welded along the first groove body 4, only the first groove body 4 is filled with welding filler, the second groove body 5 is kept in an unfilled state, a welding filler line is formed in the first groove body 4, so that the second groove body 5 and the base metal allowance formed by the welding filler line filled in the first groove body 4 are filled, under the condition that the base metal allowance formed by the second groove body 4 is not filled with welding filler, the filling amount of welding materials reaches the welding filler line, and the unfilled base metal allowance is used for simply increasing the rigidity, so that the base metal allowance is increased, the wheel disc 3 increases the rigidity of the base metal per se, and the deformation resistance is improved; secondly, the filling amount of the welding seam is not increased, and the root cause of impeller deformation is reduced.
In some embodiments, referring to fig. 9, before milling the first groove 4 corresponding to the blade 2 on the wheel disc 3, the method further includes milling the outer side edge of the wheel disc 3 to make the outer side angle α of the outer side edge of the wheel disc 3 be 3 to 4 ° so as to avoid the situation that the outer side margin of the wheel disc 3 is insufficient, thereby better improving the outer side deformation problem of the wheel disc 3, because the outer side edge of the wheel disc 3 is just in the range of one-third to two-thirds of the blades at the air inlet of the blade 2, the adjustment of the outer side angle of the outer side edge of the wheel disc 3 can maximally compensate and improve the outer side deformation problem of the wheel disc 3, and is a method which does not increase the cost, is simple, and is effective and solves the fundamental problem.
The invention provides a slotted welding impeller, which is processed by the method.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A welding deformation control method for a large-scale slotting welded impeller is characterized by comprising the following steps:
milling blades on the wheel cover blank;
milling a first groove body corresponding to the blade on the wheel disc, and milling a second groove body on one side of the first groove body, which is far away from the blade;
and welding the wheel disc and the blade along the first groove body, filling the first groove body with the welded blade and the welded wheel disc.
2. The welding deformation control method for the large slotted welding impeller according to claim 1, wherein when the first slot corresponding to the blade is milled on the wheel disc, the method comprises the following steps:
determining the width value of the groove bottom of the first groove body according to the thickness of the blade; the width value of the groove bottom of the first groove body is not smaller than the thickness value of the blade.
3. The welding deformation control method for the large slotted welding impeller according to claim 2, wherein when the first slot corresponding to the blade is milled on the wheel disc, the method comprises the following steps:
determining a slotting track and a slot bottom width value on the wheel disc according to the thickness value of the blade and the blade profile of the blade;
and slotting the wheel disc according to the determined slotting track and the width value of the groove bottom, so that a first groove body with an isosceles trapezoid cross section is formed on the wheel disc.
4. The method of claim 3, wherein the angles between the two side walls and the bottom of the first slot are 75-80 °.
5. The welding deformation control method for the large slotted welding impeller according to claim 3, wherein when a second slot body is milled on one side of the first slot body, which is far away from the blade, the method comprises the following steps:
and milling one side of the first groove body, which is far away from the blade, on the wheel disc to form a second groove body with a rectangular cross section on one side of the first groove body, which is far away from the blade.
6. The welding deformation control method for the large slotted welding impeller according to claim 5, wherein the central axis of the cross section of the second slot body is collinear with the central axis of the cross section of the first slot body.
7. The welding deformation control method for the large slotted welding impeller according to claim 6, wherein the width of the second slot body is larger than the width of the first slot body on the side far away from the slot bottom.
8. The welding deformation control method for the large slotted welding impeller according to claim 5, wherein the height of the second slot body is 3-5 mm.
9. The welding deformation control method for the large-scale grooved welding impeller according to any one of claims 1 to 8, characterized by further comprising milling the outer side edge of the wheel disc so that the outer side angle of the outer side edge of the wheel disc is 3-4 ° before milling the first groove body corresponding to the blade on the wheel disc.
10. A slot-welded impeller, produced by the method according to any one of claims 1 to 9.
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| CN202110995350.6A CN113829004B (en) | 2021-08-27 | 2021-08-27 | Welding deformation control method for large-sized slotted welding impeller and slotted welding impeller |
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| CN202110995350.6A CN113829004B (en) | 2021-08-27 | 2021-08-27 | Welding deformation control method for large-sized slotted welding impeller and slotted welding impeller |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60240385A (en) * | 1984-05-14 | 1985-11-29 | Ishikawajima Harima Heavy Ind Co Ltd | Method of slot welding |
| US20080237195A1 (en) * | 2007-03-27 | 2008-10-02 | Masaaki Iwasa | Welding slot sealing structure and welding method |
| JP2009090349A (en) * | 2007-10-10 | 2009-04-30 | Hitachi Plant Technologies Ltd | Method and apparatus for welding impeller |
| CN101769265A (en) * | 2008-12-29 | 2010-07-07 | 沈阳鼓风机集团有限公司 | Method for controlling deformation during welding flow passage of binary notch welded impeller of centrifugal compressor |
| CN102107335A (en) * | 2009-12-23 | 2011-06-29 | 沈阳鼓风机集团有限公司 | Welding manufacturing method of closed-type turbine wheel of centripetal expander |
| CN102107361A (en) * | 2009-12-23 | 2011-06-29 | 沈阳鼓风机集团有限公司 | Closed three-element impeller slot welding machining and robot automatic welding control method |
-
2021
- 2021-08-27 CN CN202110995350.6A patent/CN113829004B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60240385A (en) * | 1984-05-14 | 1985-11-29 | Ishikawajima Harima Heavy Ind Co Ltd | Method of slot welding |
| US20080237195A1 (en) * | 2007-03-27 | 2008-10-02 | Masaaki Iwasa | Welding slot sealing structure and welding method |
| JP2009090349A (en) * | 2007-10-10 | 2009-04-30 | Hitachi Plant Technologies Ltd | Method and apparatus for welding impeller |
| CN101769265A (en) * | 2008-12-29 | 2010-07-07 | 沈阳鼓风机集团有限公司 | Method for controlling deformation during welding flow passage of binary notch welded impeller of centrifugal compressor |
| CN102107335A (en) * | 2009-12-23 | 2011-06-29 | 沈阳鼓风机集团有限公司 | Welding manufacturing method of closed-type turbine wheel of centripetal expander |
| CN102107361A (en) * | 2009-12-23 | 2011-06-29 | 沈阳鼓风机集团有限公司 | Closed three-element impeller slot welding machining and robot automatic welding control method |
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