CN111112409A - Forming method for milling conical bottom melon petal with large wall thickness - Google Patents
Forming method for milling conical bottom melon petal with large wall thickness Download PDFInfo
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- CN111112409A CN111112409A CN201911385122.6A CN201911385122A CN111112409A CN 111112409 A CN111112409 A CN 111112409A CN 201911385122 A CN201911385122 A CN 201911385122A CN 111112409 A CN111112409 A CN 111112409A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
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Abstract
The invention provides a forming method for a milling cone bottom melon petal with large wall thickness number, which comprises the steps of arranging auxiliary ribs, sequentially arranging a first auxiliary rib and a second auxiliary rib at the short arc position of the top end of a fan-shaped plate, arranging a third auxiliary rib at the long arc position of the bottom end of the plate, and adopting annular and longitudinal rib distribution in the same grid area at the flange hole position of the fan-shaped plate to avoid the distortion at the position and form a plate rolling cone; further, the center connecting line of the inner surface of the plate is coplanar with the axes of the upper roller and the lower roller of the rolling device, and the pressing amount and the inclination angle of the left roller and the right roller at two sides of the lower roller of the rolling device are adjusted. According to the forming method for the milling cone bottom melon petal with the large wall thickness, the auxiliary ribs are arranged and the rolling cone parameters are optimized, so that the grid area and the welding allowance area are prevented from cracking due to stress concentration, manual trimming is reduced, the forming precision and the surface quality are ensured, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the field of high-end manufacturing, and particularly relates to a forming method for milling a conical bottom melon petal with large wall thickness.
Background
In order to save space and shorten the rocket body length, a cone bottom is adopted to transmit part of engine thrust, and the existing cone bottom storage box ring is formed by stirring, friction and welding 6 cone bottom melon petals.
Under the prior art condition, big wall thickness awl end melon lamella is because of its wall thickness is big, the net size is little, and the size profile is big, often adopts the mode that the equal thickness board rolls up awl + machine and adds (or chemical milling), because the size profile is big when rolling up the awl shaping, still need to guarantee that big end feed angular velocity is unanimous, specifically has following drawback: firstly, the high rib thickness ratio grid is smaller in size, a special large-size tire is required to clamp and ensure a profile when the grid is machined and milled, the stress is released in the machining process, the profile is seriously deformed, the trimming difficulty is higher, and the production efficiency is low; secondly, when the high-rib thick grid is chemically milled, certain influence can be caused to the environment, the rib width and the root fillet cannot be accurately controlled, the purpose of reducing weight is difficult to achieve, meanwhile, stress release also exists in the chemical milling process, and the difficulty of the subsequent shape correcting process is high. Meanwhile, when the conical-bottom melon petal is milled for rolling and forming a large-wall-thickness cone, because the internal stress is large, the grid ribs on the outer surface are subjected to tensile stress, instability is easily caused, cracks are formed, the mutual constraint force of the large end and the small end is large, the resilience is difficult to control, the forming rule is difficult to find, and the consistency of the product is poor.
Disclosure of Invention
In view of the above, the present invention is directed to provide a forming method for milling a conical bottom melon petal with a large wall thickness, which avoids the grid area and the welding allowance area from cracking due to stress concentration by setting the auxiliary ribs and optimizing the parameters of the rolling cone, reduces artificial trimming, ensures forming accuracy and surface quality, and improves production efficiency.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a forming method for milling conical bottom melon petals with large wall thickness comprises the following steps:
step 1: setting auxiliary ribs: sequentially arranging a first auxiliary rib and a second auxiliary rib at the short arc at the top end of the fan-shaped plate; arranging a third auxiliary rib at the long arc at the bottom end of the plate;
step 2: rolling and tapering the plate material: the center connecting line of the inner surface of the plate is coplanar with the axes of the upper rolling shaft and the lower rolling shaft of the rolling device, and the pressing amount and the inclination angle of the left rolling shaft and the right rolling shaft on two sides of the lower rolling shaft of the rolling device are adjusted;
and step 3: and (3) straightening after cone rolling: after the sheet material rolling cone is formed, a wall plate shape correcting machine is used for correcting radian and straightness.
In step 1: the two ends of the first auxiliary rib, the second auxiliary rib and the third auxiliary rib are 15mm longer than the outermost rib of the middle body of the corresponding plate; the thickness of the first auxiliary rib, the second auxiliary rib and the third auxiliary rib is 1mm higher than that of the plate, so that cracks in a product area are avoided, the plastic deformation proportion is improved, and the deformation consistency is ensured. The width of the first auxiliary rib is 8mm, the width of the second auxiliary rib is 20mm, the width of the third auxiliary rib is 25mm, the flange hole of the plate is provided with an annular longitudinal rib and a thin area which have the same circumferential curvature as the grid area of the plate, the thickness of the thin area and the width of the annular longitudinal rib are the same as the size of the thin area and the grid area of the plate, the annular longitudinal ribs are symmetrically and uniformly distributed in the middle, three ribs are arranged in the transverse direction and the longitudinal direction respectively, the self strength and the pre-deformation during forming are guaranteed, and the distortion at the position is avoided, so that the product precision is not influenced.
In step 2: the gap between the upper roller and the lower roller of the rolling device is 20mm, the pressing amount of the left roller on the flange side of the plate is 90mm-100mm, the pressing amount of the right roller is 180mm-195mm, the pressing amount of the left roller on the grid side of the plate is 130mm-140mm, and the pressing amount of the right roller is 180mm-195 mm.
In step 3: adjusting a shape correction area along a central radial axis according to the taper melon petal, establishing a gradual deformation shape correction sequence from the middle area to two sides, and setting parameters of the feeding amount of a hydraulic cylinder top of the area wall plate shape correction machine, wherein the middle area is 218mm-215mm, the upper end area is 225mm-220mm, and the lower end area is 230mm-225 mm.
Compared with the prior art, the forming method for milling the conical bottom melon petal with large wall thickness has the following advantages:
according to the forming method for the milling cone bottom melon petal with the large wall thickness, the auxiliary ribs are arranged and the rolling cone parameters are optimized, so that the grid area and the welding allowance area are prevented from cracking due to stress concentration, manual trimming is reduced, the forming precision and the surface quality are ensured, and the production efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic diagram of a step one of a forming method for milling a conical bottom melon petal with a large wall thickness according to an embodiment of the present invention;
fig. 2 is a schematic bottom view of a second step of a forming method for milling conical bottom petals with a large wall thickness according to an embodiment of the present invention.
Fig. 3 is a schematic front view of a second step of a forming method for milling a conical bottom melon petal with a large wall thickness according to an embodiment of the present invention.
Description of reference numerals:
1-a lower roller; 2-plate material; 3-left side roller; 4-right side roller; 5-grid area; 6-welding allowance area; 71-first auxiliary ribs; 72-second auxiliary ribs; 73-third auxiliary ribs.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-2, a forming method for milling conical bottom melon petal with large wall thickness comprises the following steps:
step 1: setting auxiliary ribs: a first auxiliary rib 71 and a second auxiliary rib 72 are sequentially arranged at the short arc at the top end of the fan-shaped plate 2; a third auxiliary rib 73 is arranged at the long arc position at the bottom end of the plate material 2; the first auxiliary bead 71, the second auxiliary bead 72, and the third auxiliary bead 73 are provided to prevent the mesh region 5 and the welding allowance region 6 from cracking due to stress concentration.
Step 2: and (3) rolling and tapering the plate material 2: the connecting line of the center of the inner surface of the plate 2 is coplanar with the axes of the upper and lower rolling shafts of the rolling device, and the pressing amount and the inclination angle of the left rolling shaft 3 and the right rolling shaft 4 at two sides of the lower rolling shaft 1 of the rolling device are adjusted;
and step 3: and (3) straightening after cone rolling: after the sheet material 2 is formed by rolling cone, the radian and straightness are corrected by using a wall plate shape correcting machine.
As shown in fig. 1, both ends of the first auxiliary rib, the second auxiliary rib and the third auxiliary rib are 15mm longer than the outermost rib of the middle body of the corresponding plate; the thickness of the first auxiliary rib, the second auxiliary rib and the third auxiliary rib is 1mm higher than that of the plate, so that cracks in a product area are avoided, the plastic deformation proportion is improved, and the deformation consistency is ensured. The width of the first auxiliary rib is 8mm, the width of the second auxiliary rib is 20mm, the width of the third auxiliary rib is 25mm, the flange hole of the plate is provided with an annular longitudinal rib and a thin area which have the same circumferential curvature as the grid area of the plate, the thickness of the thin area and the width of the annular longitudinal rib are the same as the size of the thin area and the grid area of the plate, the annular longitudinal ribs are symmetrically and uniformly distributed in the middle, three ribs are arranged in the transverse direction and the longitudinal direction respectively, the self strength and the pre-deformation during forming are guaranteed, and the distortion at the position is avoided, so that the product precision is not influenced.
As shown in fig. 2, in step 2: the gap between the upper roller and the lower roller of the rolling device is 20mm, the pressing amount of the left roller 3 at the flange side of the plate 2 is 90mm-100mm, the pressing amount of the right roller 4 is 180mm-195mm, the pressing amount of the left roller 3 at the grid side of the plate 2 is 130mm-140mm, and the pressing amount of the right roller 4 is 180mm-195 mm.
In step 3: adjusting a shape correction area along a central radial axis according to the taper melon petal, establishing a gradual deformation shape correction sequence from the middle area to two sides, and setting parameters of the feeding amount of a hydraulic cylinder top of the area wall plate shape correction machine, wherein the middle area is 218mm-215mm, the upper end area is 225mm-220mm, and the lower end area is 230mm-225 mm.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A forming method for milling a conical bottom melon petal with large wall thickness is characterized by comprising the following steps of: the method comprises the following steps:
step 1: setting auxiliary ribs: a first auxiliary rib (71) and a second auxiliary rib (72) are sequentially arranged at the short arc at the top end of the fan-shaped plate (2); arranging a third auxiliary rib (73) at the long arc at the bottom end of the plate (2);
step 2: rolling and tapering the plate (2): the central connecting line of the inner surface of the plate (2) is coplanar with the axes of the upper rolling shaft and the lower rolling shaft of the rolling device, and the pressing amount and the inclination angle of the left rolling shaft (3) and the right rolling shaft (4) on two sides of the lower rolling shaft (1) of the rolling device are adjusted;
and step 3: and (3) straightening after cone rolling: and after the sheet material (2) is formed by rolling cone, performing radian and straightness correction by using a wall plate shape correcting machine.
2. The forming method for milling the conical bottom melon petal with large wall thickness according to claim 1, wherein the forming method comprises the following steps: in step 1: the two ends of the first auxiliary rib (71), the second auxiliary rib (72) and the third auxiliary rib (73) are 15mm longer than the corresponding outermost rib of the middle body of the plate (2); first supplementary rib (71), second supplementary rib (72) and third supplementary rib (73) thickness ratio sheet material (2) thickness height 1mm, first supplementary rib (71) width is 8mm, second supplementary rib (72) width is 20mm, third supplementary rib (73) width is 25mm, the flange hole department of sheet material (2) is equipped with the same vertical rib of ring and the thin district of the same hoop camber in sheet material (2) net district, thin district thickness and the vertical rib width of ring with the thin district of product and the net district size of sheet material (2) are the same, the vertical rib of ring with middle symmetry equipartition, violently indulge and respectively be equipped with three.
3. The forming method for milling the conical bottom melon petal with large wall thickness according to claim 1, wherein the forming method comprises the following steps: in step 2: the gap between the upper rolling shaft and the lower rolling shaft of the rolling device is 20mm, the pressing amount of the left rolling shaft (3) on the flange side of the plate (2) is 90-100 mm, the pressing amount of the right rolling shaft (4) is 180-195 mm, the pressing amount of the left rolling shaft (3) on the grid side of the plate (2) is 130-140 mm, and the pressing amount of the right rolling shaft (4) is 180-195 mm.
4. The forming method for milling the conical bottom melon petal with large wall thickness according to claim 1, wherein the forming method comprises the following steps: in step 3: adjusting a shape correction area along a central radial axis according to the taper melon petal, establishing a gradual deformation shape correction sequence from the middle area to two sides, and setting parameters of the feeding amount of a hydraulic cylinder top of the area wall plate shape correction machine, wherein the middle area is 218mm-215mm, the upper end area is 225mm-220mm, and the lower end area is 230mm-225 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911385122.6A CN111112409B (en) | 2019-12-28 | 2019-12-28 | Forming method for milling conical bottom melon petal with large wall thickness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911385122.6A CN111112409B (en) | 2019-12-28 | 2019-12-28 | Forming method for milling conical bottom melon petal with large wall thickness |
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| CN111112409A true CN111112409A (en) | 2020-05-08 |
| CN111112409B CN111112409B (en) | 2022-03-25 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117870A (en) * | 1994-10-31 | 1996-05-14 | Sky Alum Co Ltd | Method and device for bending metallic panel with rib |
| JP2006263808A (en) * | 2005-03-23 | 2006-10-05 | Hokumei Kikai:Kk | Roller apparatus for accurately and easily bending tapered tube and fan-like plate |
| JP2016153137A (en) * | 2015-02-20 | 2016-08-25 | 株式会社栗本鐵工所 | Bending device and method of bending steel plate |
| CN106370066A (en) * | 2015-07-20 | 2017-02-01 | 上海航天设备制造总厂 | Machine-milling grid wallboard structure of carrier rocket and bending forming method for same |
| CN106964676A (en) * | 2017-03-24 | 2017-07-21 | 江苏中海重型机床有限公司 | A kind of veneer reeling machine |
| CN107052104A (en) * | 2017-05-22 | 2017-08-18 | 南通超力卷板机制造有限公司 | A kind of numerical control four-roller axicon roll forming machine |
| CN110405014A (en) * | 2019-07-30 | 2019-11-05 | 中国一冶集团有限公司 | Conical shell rolls equipment |
-
2019
- 2019-12-28 CN CN201911385122.6A patent/CN111112409B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117870A (en) * | 1994-10-31 | 1996-05-14 | Sky Alum Co Ltd | Method and device for bending metallic panel with rib |
| JP2006263808A (en) * | 2005-03-23 | 2006-10-05 | Hokumei Kikai:Kk | Roller apparatus for accurately and easily bending tapered tube and fan-like plate |
| JP2016153137A (en) * | 2015-02-20 | 2016-08-25 | 株式会社栗本鐵工所 | Bending device and method of bending steel plate |
| CN106370066A (en) * | 2015-07-20 | 2017-02-01 | 上海航天设备制造总厂 | Machine-milling grid wallboard structure of carrier rocket and bending forming method for same |
| CN106964676A (en) * | 2017-03-24 | 2017-07-21 | 江苏中海重型机床有限公司 | A kind of veneer reeling machine |
| CN107052104A (en) * | 2017-05-22 | 2017-08-18 | 南通超力卷板机制造有限公司 | A kind of numerical control four-roller axicon roll forming machine |
| CN110405014A (en) * | 2019-07-30 | 2019-11-05 | 中国一冶集团有限公司 | Conical shell rolls equipment |
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| CN111112409B (en) | 2022-03-25 |
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