CN115921640A - Opposite wheel strong spinning type incremental forming process for super-large diameter conical wind power tower barrel section - Google Patents
Opposite wheel strong spinning type incremental forming process for super-large diameter conical wind power tower barrel section Download PDFInfo
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- CN115921640A CN115921640A CN202211677337.7A CN202211677337A CN115921640A CN 115921640 A CN115921640 A CN 115921640A CN 202211677337 A CN202211677337 A CN 202211677337A CN 115921640 A CN115921640 A CN 115921640A
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Abstract
A pair wheel powerful spinning type incremental forming process of an oversized-diameter conical wind power tower cylinder section is characterized in that a plurality of pairs of spinning wheels are symmetrically and uniformly distributed along the circumference of a cylinder blank in pair wheel spinning, the inner surface and the outer surface of the cylinder blank are processed at the same time, a spinning wheel group is processed from inside to outside at the same height through a preset path, and in addition, the incremental processing is carried out through a plurality of passes for the stability of the processing process; in the process of wheel spinning, the blank of the cylindrical part is thinned and hardened, and the performance is improved; the processing modes such as welding, splicing and the like are not needed, the processing efficiency is high, and the effect is good; the method is suitable for large-size workpieces, core moulds with different sizes are not required to be prepared, the processing flexibility is high, and the cost is low; the formed piece has the advantages of high surface quality, light whole weight, high strength and high utilization rate of near-net forming materials.
Description
Technical Field
The invention belongs to the field of high-efficiency high-performance material-saving machining of large-scale wind power conical tower drums, and particularly relates to a powerful spinning type incremental forming process for a pair wheel of an ultra-large diameter conical wind power tower drum section for supporting an ultra-large power wind power top fan.
Background
The wind turbine generator with the ultra-large diameter has high requirements on the performance of the wind tower drum, but the manufacturing method of the wind tower drum is complex in production process, the performance of the produced wind tower drum is poor, the weight of the drum is large, steel consumption is high, and actual requirements are difficult to meet.
The existing common production method of the wind power tower cylinder is that plates are used as raw materials, the plates are manufactured in blocks by using the traditional process, and then splicing and welding are carried out; or the plate is bent and rolled, and the joint is connected by using a welding method, for example, the split type fan tower cylinder in Chinese patent and the manufacturing method and the transportation method thereof (publication No. CN 108301982B) adopt the manufacturing and welding method of the split type tower cylinder, the steel plate is rolled in a reversing way to form a tower body section, and the tower body section is stacked and welded in a certain way; in the Chinese patent, a polygonal wind power tower and a manufacturing method thereof (publication number: CN 105484945B) adopt a bending machine to fold an LP steel plate into a polygonal split structure and splice and weld split into a polygonal tower cylinder. Such production manufacturing methods present a longitudinal weld, or one or more welds in circumferential direction. When the welding, can produce local high temperature, can influence the shape and the performance of peripheral material, each vertical welding seam can make barrel intensity reduce about 1/2, and each hoop welding seam can make barrel intensity reduce about 1/3, and welding seam department also can have various defects, and a large amount of welding can cause part weight great simultaneously to the time that production was expended is longer.
The existing tailor welding and coil welding method widely applied to the production and manufacturing of the wind power tower cylinder has the following defects: (1) The process of circumferential and axial tailor-welding of the conical tower tube sheet metal part in blocks causes the complex manufacturing and mounting process and more material waste. (2) A plurality of tower barrel parts are welded together, the number of welding positions is large, the welding process is long, and the production efficiency is affected. (3) Because the welding seam is more on the tower section of thick bamboo, tower section of thick bamboo tube structure is overweight, and the peripheral size precision of welding position is relatively poor and welding seam intensity is relatively poor simultaneously. Therefore, a new production method is needed to complete the high-quality and efficient production of the tower tube of the ultra-large diameter wind tower.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a pair-wheel powerful spinning type incremental forming process of an oversized-diameter conical wind power tower cylinder section, by means of pair-wheel powerful spinning, when the pair-wheel spinning is carried out and the tower cylinder bodies with different sizes are corresponded, core moulds with different sizes are not required to be additionally arranged, and meanwhile, the production of tower cylinders with different shapes and lengths can be completed by adjusting spinning paths, so that the production equipment is flexible in design, the cost is saved, and the applicability is improved; meanwhile, because the single tower barrel section does not have a welding seam in the machining process, welding is not needed, the production time is saved, the production efficiency is improved, the dimensional accuracy and the overall strength of the barrel are also improved, and the tower barrel has the advantages of low cost, high production efficiency, high dimensional accuracy of a formed part, high strength, material waste reduction in near-net forming and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pair-wheel powerful spinning type incremental forming process of an oversized-diameter conical wind power tower barrel section is characterized in that a barrel-shaped piece blank is placed on spinning equipment and then spun into a conical wind power tower barrel with a wall thickness being thin at the top and thick at the bottom, and comprises the following steps:
firstly, clamping a cylindrical part blank 1 on an inner expanding type clamp 6 of spinning equipment, connecting the inner expanding type clamp 6 on a main shaft 7 of the spinning equipment, and fixing the cylindrical part blank 1 on the inner expanding type clamp 6 through a pin 5;
secondly, starting a main shaft 7 of the spinning equipment, wherein the main shaft 7 of the spinning equipment drives the cylindrical part blank 1 to rotate through an internal expanding type clamp 6, an internal rotating wheel and an external rotating wheel of a rotating wheel 4 start to feed radially from the periphery of the uppermost end or the lowermost end of the cylindrical part blank 1, meanwhile, a servo motor 2 drives the rotating wheel 4 to rotate actively through a planet wheel reducer 3, and the rotating wheel 4 bites into the cylindrical part blank 1 until the position is preset;
thirdly, the spinning wheel 4 is divided into an inner spinning wheel and an outer spinning wheel which are axially and obliquely fed in different directions for spinning, and the heights of the inner spinning wheel and the outer spinning wheel in the vertical direction are kept consistent;
fourthly, the spinning wheel 4 finishes thinning and shaping repeatedly and progressively according to the first to the third steps, and in the last pass, the spinning thinning slightly exceeds the final target;
fifthly, repeating the first step and the third step, and finishing the shape-righting spinning of one pass by the spinning wheel 4 according to the corresponding path of the final target;
and sixthly, detaching the cylindrical part blank 1 from the internal expansion type clamp 6, and cutting the root part of the spinning position to obtain the wind power tower cylinder section 8.
The spinning wheel 4 is connected to the planet wheel reducer 3, an input shaft of the planet wheel reducer 3 is connected with the servo motor 2, and the rotating speed of the servo motor 2 is adjustable, so that the rotating linear speed of the cylindrical part blank 1 is consistent with the rotating linear speed of the spinning wheel.
In the machining process of carrying out powerful spinning on the cylindrical part blank 1 by the spinning wheel 4, the reduction amount of each pass refers to the size and the material of the cylindrical section of the wind power tower, so that the cylindrical section can be stably machined, and the reduction plasticity is finished in a multi-pass progressive mode.
In the machining process of carrying out opposite-wheel powerful spinning on the cylindrical part blank 1 by the spinning wheel 4, the spinning wheel completes spinning from top to bottom in a reverse-spinning mode, or completes spinning from bottom to top in a forward-spinning mode.
The cylindrical part blank 1 is fixed on an internal expanding type clamp 6 by pins 5 which are symmetrically distributed on the circumference.
The pair of spinning wheels 4 are uniformly and symmetrically distributed along the circumference of the cylindrical part blank 1 in the pair of spinning wheels, and the inner surface and the outer surface of the cylindrical part blank 1 are processed simultaneously.
Compared with the prior art, the manufacturing method has the advantages that the manufacturing of the large-size wind power tower drum is realized by the spinning principle of the paired wheels, and the manufacturing method has the following advantages:
(1) The method for processing the large-size wind power tower cylinder section by using the paired wheel powerful spinning mode has relatively low requirement on equipment, is an integrated near-net forming mode, has high production efficiency, does not need multiple welding, and does not cause waste of metal materials.
(2) The forced spinning of the paired wheels adopted by the invention is a metal plastic forming mode, no welding seam exists on a formed piece of the tower section of the wind tower, the formed piece has light weight and high forming precision, and the formed piece has higher strength after plastic deformation and work hardening.
(3) In order to deal with metal rebound generated by plastic forming in the processing process, progressive spinning forming is carried out at a reduction ratio slightly exceeding a forming target to reserve a rebound space, and shape correction is carried out at the reduction ratio of the forming target in the last pass, so that the forming precision is further improved.
Drawings
FIG. 1 is a schematic diagram of a pair of wheel spinning processes according to the present invention.
FIG. 2 is a schematic view of a first step of the wheel spin forming process of the present invention.
FIG. 3 is a schematic view of a second step of the wheel spin forming process of the present invention.
FIG. 4 is a third schematic view of the wheel spin forming process of the present invention.
FIG. 5 is a schematic view of a fourth step of the wheel spin forming process of the present invention.
FIG. 6 is a diagram of the final effect of the wheel spinning according to the present invention.
Fig. 7 is a schematic view of another directional spinning process of the present invention.
FIG. 8 is an external view of a wind tower segment after spinning of a pair of wheels according to the present disclosure.
Detailed Description
The present invention will be described in detail below with reference to examples and the accompanying drawings.
Referring to fig. 1, the pair wheel powerful spinning type incremental forming process of the super-large diameter conical wind power tower cylinder section includes the following steps that a plurality of pairs of spinning wheels are symmetrically and uniformly distributed along the circumference of a cylinder blank in pair wheel spinning, the inner surface and the outer surface of the cylinder blank are processed simultaneously, and multi-pass spinning is carried out through a preset path to complete incremental forming:
firstly, referring to fig. 2, clamping a cylindrical part blank 1 on an internal expansion type clamp 6 of spinning equipment, connecting the internal expansion type clamp 6 on a main shaft 7 of the spinning equipment, and fixing the cylindrical part blank 1 on the internal expansion type clamp 6 through a pin 5;
secondly, referring to fig. 3, starting a main shaft 7 of the spinning equipment, wherein the main shaft 7 of the spinning equipment drives a cylindrical part blank 1 to rotate through an internal expanding type clamp 6, an internal rotating wheel and an external rotating wheel of a rotating wheel 4 start to feed radially from the periphery of the lowest end of the cylindrical part blank 1, meanwhile, a servo motor 2 drives the rotating wheel 4 to rotate actively through a planet wheel reducer 3, and the rotating wheel 4 bites into the cylindrical part blank 1 until the position is preset;
thirdly, referring to fig. 4, in order to achieve the preset conical tower shape with the wall thickness being thin at the top and thick at the bottom, the spinning roller 4 is divided into an inner spinning roller and an outer spinning roller to perform spinning by axially and obliquely feeding in different directions, but in order to ensure the stability of the spinning process of the spinning roller, the heights of the inner spinning roller and the outer spinning roller in the vertical direction are kept consistent;
fourthly, referring to fig. 5, the spinning wheel 4 repeatedly and progressively completes the thinning and shaping work according to the first to third steps, and the spinning thinning slightly exceeds the final target in the last pass;
the spinning wheel 4 performs spinning for one pass at a feeding amount slightly exceeding the final target in the fourth step, so as to deal with the springback of the metal material after the spinning is finished and reduce the deviation of the final result;
fifthly, repeating the first step and the third step, and finishing the shape-righting spinning of one pass by the spinning wheel 4 again according to the corresponding path of the final target so as to improve the final spinning precision, as shown in fig. 6;
sixthly, the cylindrical part blank 1 is detached from the internal expanding type clamp 6, and the root part of the spinning position is cut to obtain the wind power tower cylindrical section 8, as shown in fig. 8.
The spinning wheel 4 is connected with the planet wheel reducer 3 through a transmission shaft and a key, an input shaft of the planet wheel reducer is connected with the servo motor 2, and the rotating speed of the servo motor 2 is adjustable, so that the rotating linear speed of the cylinder wall workpiece is consistent with that of the spinning wheel.
In the machining process of carrying out powerful spinning on the cylindrical part blank 1 in a paired wheel mode by the spinning wheel 4, in order to ensure the stability of the whole machining process, the thinning amount of each pass is made to be stable according to the size and the material of the cylindrical section of the wind power tower, and the thinning plasticity is finished in a multi-pass progressive mode.
Referring to fig. 3 and 7, in the process of performing the pair-wheel power spinning on the cylindrical blank 1, the spinning wheel 4 can perform the spinning in a reverse-spinning manner from top to bottom, and can also perform the spinning in a forward-spinning manner from bottom to top.
The cylindrical part blank 1 is fixed on an internal expanding type clamp 6 through pins 5 which are symmetrically distributed on the circumference, so that the cylindrical part blank 1 and the internal expanding type clamp 6 are prevented from sliding relatively when rotating.
The pair of spinning wheels are uniformly and symmetrically distributed along the circumference of the cylindrical part blank 1 by adopting a plurality of pairs of spinning wheels, and simultaneously, the inner surface and the outer surface of the workpiece are processed.
Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes, modifications, and equivalents may be made without departing from the spirit and scope of the invention.
Claims (6)
1. The opposite-wheel powerful spinning type incremental forming process of the super-large-diameter conical wind power tower cylinder section is characterized in that a cylinder blank is placed on spinning equipment and then spun into a conical wind power tower cylinder with a wall thickness being thin at the top and thick at the bottom, and comprises the following steps:
firstly, clamping a cylindrical part blank (1) on an inner expansion type clamp (6) of spinning equipment, connecting the inner expansion type clamp (6) on a main shaft (7) of the spinning equipment, and fixing the cylindrical part blank (1) on the inner expansion type clamp (6) through a pin (5);
secondly, starting a main shaft (7) of the spinning equipment, driving a cylindrical part blank (1) to rotate by the main shaft (7) of the spinning equipment through an internal expansion type clamp (6), starting radial feeding of an internal rotating wheel and an external rotating wheel of a rotating wheel (4) from the lowest end or the periphery of the highest end of the cylindrical part blank (1), driving the rotating wheel (4) to rotate actively by a servo motor (2) through a planetary reducer (3), and biting the rotating wheel (4) into the cylindrical part blank (1) until the position is preset;
thirdly, the spinning wheel (4) is divided into an inner spinning wheel and an outer spinning wheel which are axially and obliquely fed in different directions for spinning, and the heights of the inner spinning wheel and the outer spinning wheel in the vertical direction are kept consistent;
fourthly, the spinning wheel (4) finishes thinning and shaping repeatedly and progressively according to the first to the third steps, and in the last pass, the spinning thinning slightly exceeds the final target;
fifthly, repeating the first step and the third step, and finishing the shape righting spinning of one pass by the spinning wheel (4) according to the corresponding path of the final target;
and sixthly, detaching the cylindrical part blank (1) from the internal expansion type clamp (6), and cutting the root part of the spinning position to obtain the wind power tower cylinder section (8).
2. The process according to claim 1, characterized in that: the rotating wheel (4) is connected to the planet wheel speed reducer (3), an input shaft of the planet wheel speed reducer (3) is connected with the servo motor (2), and the rotating speed of the servo motor (2) is adjustable, so that the rotating linear speed of the cylindrical part blank (1) is consistent with the rotating wheel linear speed.
3. The process according to claim 1, characterized in that: in the machining process of carrying out powerful spinning on the cylindrical part blank (1) by the spinning wheel (4), the reduction amount of each pass refers to the size and the material of the cylindrical section of the wind power tower, so that the cylindrical section can be stably machined, and the reduction plasticity is finished in a multi-pass progressive mode.
4. The process according to claim 1, characterized in that: and in the machining process of carrying out opposite-wheel powerful spinning on the cylindrical part blank (1) by the spinning wheel (4), the spinning wheel completes spinning from top to bottom in a reverse spinning mode, or completes spinning from bottom to top in a forward spinning mode.
5. The process according to claim 1, characterized in that: the cylindrical part blank (1) is fixed on an internal expansion type clamp (6) by pins (5) which are symmetrically distributed on the circumference.
6. The process according to claim 1, characterized in that: the pair of spinning wheels (4) are uniformly and symmetrically distributed along the circumference of the cylindrical part blank (1) in the pair of spinning wheels, and the inner surface and the outer surface of the cylindrical part blank (1) are machined simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211677337.7A CN115921640A (en) | 2022-12-26 | 2022-12-26 | Opposite wheel strong spinning type incremental forming process for super-large diameter conical wind power tower barrel section |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211677337.7A CN115921640A (en) | 2022-12-26 | 2022-12-26 | Opposite wheel strong spinning type incremental forming process for super-large diameter conical wind power tower barrel section |
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| CN115921640A true CN115921640A (en) | 2023-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117600308A (en) * | 2023-12-12 | 2024-02-27 | 中信戴卡股份有限公司 | Symmetrical spinning forming equipment and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117600308A (en) * | 2023-12-12 | 2024-02-27 | 中信戴卡股份有限公司 | Symmetrical spinning forming equipment and method |
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