CN110814134A - Method for forming convex hole in bottom of storage box - Google Patents
Method for forming convex hole in bottom of storage box Download PDFInfo
- Publication number
- CN110814134A CN110814134A CN201911142891.3A CN201911142891A CN110814134A CN 110814134 A CN110814134 A CN 110814134A CN 201911142891 A CN201911142891 A CN 201911142891A CN 110814134 A CN110814134 A CN 110814134A
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- Prior art keywords
- hole
- die
- flanging
- forming
- storage box
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Links
- 238000003860 storage Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003754 machining Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 229940099259 vaseline Drugs 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a method for forming a convex hole in the bottom of a storage box, which comprises the following steps: A. machining a primary hole on the bottom of the storage box; B. and C, flanging and forming the bottom of the storage box with the primary hole in the step A on a flanging die. The invention uses the steel mould to form the flanging hole at the bottom of the large-scale storage box, can ensure the stability and reliability of the product manufacturing quality, and can meet the use requirements of the storage box of the aerospace vehicle.
Description
Technical Field
The invention relates to a method for forming a convex hole in the bottom of a storage box, in particular to a process method for forming a flanging hole in the convex hole in the bottom of a large storage box by using a steel die.
Background
The storage tank of the aerospace vehicle is formed by processing multi-purpose aluminum alloy plates, and various flanging holes are required to be processed at the bottom of the storage tank for welding various pipeline conduits. The diameter of the bottom of the storage box is large, and the bottom of the storage box is formed by welding a plurality of parts. The flanging hole on the bottom of the storage box can only be formed into a single flanging hole on a single part by means of a tool before tailor-welding, and then the flanging hole is combined and tailor-welded into the bottom of the storage box. Although the original convex hole forming flanging hole is simple in process, and the tool required by operation is miniaturized and simplified, the relative position deviation among the flanging holes is large after the flanging holes are combined and welded into the bottom of the storage box, and the rejection rate is high due to the fact that the size precision is difficult to meet the requirement.
In recent years, new methods for forming the bottom of the storage tank are being developed successfully, such as a stretching forming method and a spinning forming method for the bottom of the storage tank, and a flanging hole for forming a convex hole on the bottom of the storage tank which is welded in a combined and spliced mode is receiving more and more attention. During the forming process of the bottom of the storage tank, the deformation of the plate is large, the plate generates a work hardening phenomenon, the strength is improved, the plasticity is reduced, and meanwhile, a plurality of dislocations and microcracks exist inside crystal grains, so that the flanging hole is formed by the convex hole on the bottom of the storage tank, the difficulty is very high, and the breakage rate of the convex hole reaches more than 80%.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for forming a convex hole in the bottom of a storage box.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for forming a convex hole in the bottom of a storage box comprises the following steps:
A. machining a primary hole on the bottom of the storage box;
B. and C, flanging and forming the bottom of the storage box with the primary hole in the step A on a flanging die.
Preferably, the flanging die comprises an upper die and a lower die which are correspondingly arranged, the lower die comprises a base and a lower transverse seat which are connected through a mandril, the lower part of the base is provided with a hoisting shaft, the upper part of the lower transverse seat is provided with a male die and a guide pillar, the male die is fixedly connected with the lower transverse seat through a male die fixing plate, a base plate is arranged between the male die and the lower transverse seat, a screw and a positioning pin are arranged between the male die fixing plate and the lower transverse seat, a screw and a pin are arranged between the guide pillar and the lower transverse seat, the upper part of the lower transverse seat is also provided with a material pressing male die, and the; the upper die comprises a female die and a mounting hole, the female die is matched with the pressing male die, the mounting hole is matched with the male die and the guide pillar, and a bushing is arranged between the upper portion of the upper die and the guide pillar.
The male die is used for flanging the initial hole of the blank. The female die is used for completing flanging and forming of the blank together with the male die. The function of the guide post: firstly, guiding and correcting. And secondly, the male die and the female die have consistent die gaps, and the flanging forming of the hole on the blank is ensured. The pressing male die is used for pressing the blank part on the molded surface of the female die.
Further preferably, in the step a, the machined primary hole is ground and polished.
Further preferably, the diameter of the initial hole is phi 30-100mm, the distance from the center of the initial hole to the central axis of the bottom of the storage box is 200-1000mm, and the normal of the initial hole is perpendicular to the external tangent plane of the bottom of the storage box.
Further preferably, in the step a, a lubricant is applied after the primary hole is ground and polished.
Further preferably, in the step B, the flanging die is installed in the hydraulic forming press, and the pressure of the hydraulic forming press on the flanging die is 100-.
Preferably, in the step B, the flanging die is used for carrying out 3-8 times of convex hole forming on the bottom of the storage box.
The bottom of the storage box is oval, and the material of the bottom is 2212, 2A12, 2214, 2A14 and other aluminum alloy plates. The diameter phi of the lower opening part of the bottom of the storage box is 2000-3500mm, the height phi is 500-1200mm, and the wall thickness is 5-15 mm. The initial hole machining size before the convex hole at the bottom of the storage box is as follows: the diameter of the initial hole is phi 30-100mm, the distance from the center of the initial hole to the central axis of the bottom of the storage box is 200 plus 1000mm, and the normal of the initial hole is vertical to the external tangent plane of the bottom of the storage box.
The initial hole machined at the bottom of the storage box needs to be polished, edges and corners are polished to be in smooth transition, and then polishing is carried out, so that the defects of scratches, microcracks and the like are eliminated. After the initial hole is ground and polished, vaseline lubricating paste needs to be coated to reduce the friction force of the convex hole.
And (3) pressing and compacting the bottom of the storage box by using a self-made flanging die tooling die and an upper die and a lower die of the flanging die during the convex hole. The flanging die is arranged in the hydraulic forming press, and the pressure of the hydraulic forming press to the flanging die is 100 plus 500T.
The flanging die is used for forming the multiple-pass convex holes at the bottom of the storage box, and the two convex dies of the flanging die move upwards gradually at the same time, so that the two flanging holes are formed gradually in 3-8 passes.
4 positioning pins need to be installed at the top of the lower die of the flanging die. The formed flanging holes need to be corrected and polished among the multi-pass flanging forming, and vaseline lubricating paste is supplemented as required to reduce the friction force of the convex holes.
The inner diameter phi of a flanging hole formed by the convex hole is 40-120 mm, the height of the flanging is 10-20 mm, the flanging hole is in a crooked neck shape, and the two flanging holes are symmetrically distributed.
The invention has the following advantages:
the invention uses a self-made flanging die tooling die in the convex hole forming process, the upper die and the lower die of the flanging die tightly press and compact the bottom of the storage box during convex hole forming, the flanging die performs multi-pass convex hole forming on the bottom of the storage box, and two male dies of the flanging die move upwards step by step to realize multi-pass gradual forming of the flanging hole. The new convex hole method can greatly improve the success rate of the convex hole, the breakage rate of the convex hole is reduced to 10% from the previous 80%, the relative position precision of a plurality of flanging holes is very high, the 100% can meet the requirement, and compared with the method of performing single convex hole welding before the tailor-welding and then the tailor-welding to form the bottom of the storage tank, the method has great advancement and innovation, and remarkable beneficial effects are obtained.
Drawings
FIG. 1 is a schematic view of the structure of the flanging die of the invention.
Wherein: 1 is a hoisting shaft, 2 is a mandril, 3 is a cushion plate, 4 is a punch fixing plate, 5 is a punch, 6 is a bush, 7 is a key, 9 is a die, 10 is a guide post, 11 is a pressing punch, 12 is a lower transverse seat, 13-16 are screws, and 17-20 are pins.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
the bottom of the storage box is made of 2212 aluminum alloy plate, the diameter of the opening at the bottom is 2000mm, the height is 600mm, and the wall thickness is 6 mm. The diameter of the primary hole machined is phi 45mm, the distance from the center of the primary hole to the central axis of the bottom of the box is 500mm, the primary hole is ground and polished after machining, vaseline lubricating paste is coated, and the friction force of the convex hole is reduced. And then the bottom of the storage box is arranged between an upper die and a lower die of the flanging die, and is compressed and compacted. The pressure of the hydraulic forming press on the flanging die is 100T, 5-pass convex hole forming is carried out, two guide columns of the flanging die move upwards gradually at the same time, and two flanging holes are formed step by step in multiple passes. The convex hole is successfully formed into the flanging hole finally, no crack is formed at the flanging position, the inner diameter phi of the formed flanging hole is 60mm, and the height of the flanging is 15 mm. Slicing and detecting the flanging holes, wherein the flanging holes are in a crooked neck shape, and the two flanging holes are symmetrically distributed. The thickness of the flanging area is measured, the thickness dimension is shown in table 1, the thinning amount of the side A of the flanging area is large and is 4.1mm at least, and the use requirement is met.
TABLE 1 thickness measuring instrument for flanging hole at bottom of storage box
Example 2:
the bottom of the storage box is made of 2214 aluminum alloy plate, the diameter of the opening part at the bottom is 2800mm, the height is 800mm, and the wall thickness is 9 mm. The diameter of the primary hole machined is phi 65mm, the distance from the center of the primary hole to the central axis of the box bottom is 700mm, the primary hole is ground and polished after machining, vaseline lubricating paste is coated, and the friction force of the convex hole is reduced. Then the box bottom is arranged between the upper die and the lower die of the flanging die and is compressed and compacted. The pressure of the hydraulic forming press on the flanging die is 300T, the flanging die is subjected to 6-pass convex hole forming, and the two guide pillars of the flanging die move upwards gradually at the same time, so that two flanging holes are formed step by step in multiple passes. The convex hole is successfully formed into the flanging hole finally, no crack is formed at the flanging position, the inner diameter phi of the formed flanging hole is 80mm, and the height of the flanging is 20 mm. Slicing and detecting the flanging holes, wherein the flanging holes are in a crooked neck shape, and the two flanging holes are symmetrically distributed. The thickness of the flanging area is measured, the thickness dimension is shown in table 2, the thinning amount of the side A of the flanging area is large and is 5.6mm at least, and the use requirement is met.
TABLE 2 thickness measuring instrument for flanging hole at bottom of storage box
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. A method for forming a convex hole in the bottom of a storage box is characterized by comprising the following steps:
A. machining a primary hole on the bottom of the storage box;
B. and C, flanging and forming the bottom of the storage box with the primary hole in the step A on a flanging die.
2. The method for forming the bottom convex hole of the storage tank according to claim 1, wherein the method comprises the following steps: the flanging die comprises an upper die and a lower die which are correspondingly arranged, the lower die comprises a base and a lower transverse seat which are connected through a mandril, a lifting shaft is arranged at the lower part of the base, a male die and a guide pillar are arranged at the upper part of the lower transverse seat, the male die is fixedly connected with the lower transverse seat through a male die fixing plate, a base plate is arranged between the male die and the lower transverse seat, a screw and a positioning pin are arranged between the male die fixing plate and the lower transverse seat, a screw and a pin are arranged between the guide pillar and the lower transverse seat, a material pressing male die is also arranged at the upper part of the lower transverse seat, and; the upper die comprises a female die and a mounting hole, the female die is matched with the pressing male die, the mounting hole is matched with the male die and the guide pillar, and a bushing is arranged between the upper portion of the upper die and the guide pillar.
3. The method for forming the bottom boss hole of the storage tank according to claim 1 or 2, wherein: and in the step A, grinding and polishing the machined primary hole.
4. The method for forming the bottom boss hole of the storage tank according to claim 1 or 2, wherein: the diameter of the initial hole is phi 30-100mm, the distance from the center of the initial hole to the central axis of the bottom of the storage box is 200-1000mm, and the normal of the initial hole is vertical to the external tangent plane of the bottom of the storage box.
5. The method for forming the bottom convex hole of the storage box according to claim 3, wherein the method comprises the following steps: in the step A, a lubricant is smeared after the primary hole is ground and polished.
6. The method for forming the bottom boss hole of the storage tank according to claim 1 or 2, wherein: in the step B, the flanging die is installed in the hydraulic forming press, and the pressure of the hydraulic forming press to the flanging die is 100-500T.
7. The method for forming the bottom boss hole of the storage tank according to claim 1 or 2, wherein: and in the step B, the flanging die performs 3-8 times of convex hole forming on the bottom of the storage box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142891.3A CN110814134A (en) | 2019-11-20 | 2019-11-20 | Method for forming convex hole in bottom of storage box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142891.3A CN110814134A (en) | 2019-11-20 | 2019-11-20 | Method for forming convex hole in bottom of storage box |
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| Publication Number | Publication Date |
|---|---|
| CN110814134A true CN110814134A (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911142891.3A Pending CN110814134A (en) | 2019-11-20 | 2019-11-20 | Method for forming convex hole in bottom of storage box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110814134A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290353A (en) * | 2021-06-07 | 2021-08-24 | 四川航天长征装备制造有限公司 | Method for forming small-aperture flanging convex hole of aluminum alloy top cover |
| CN116000167A (en) * | 2023-01-16 | 2023-04-25 | 北京九天行歌航天科技有限公司 | A method of flanging the convex hole at the bottom of a rocket storage tank |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2197146Y (en) * | 1994-07-06 | 1995-05-17 | 林锦钿 | Drilling model on an aluminium door-fram |
| CN104043736A (en) * | 2014-06-25 | 2014-09-17 | 梧州恒声电子科技有限公司 | Flanging die of fixing frame |
| CN105312380A (en) * | 2014-06-13 | 2016-02-10 | 首都航天机械公司 | Device and method for forming flange holes in large storage box |
| CN105396951A (en) * | 2015-12-14 | 2016-03-16 | 苏州源硕精密模具有限公司 | Reversely-arranged blanking and punching compound die |
| CN107030178A (en) * | 2017-06-16 | 2017-08-11 | 威海华邦精冲科技股份有限公司 | Ring shaped metal workpiece burr removal device |
| CN107695156A (en) * | 2017-10-13 | 2018-02-16 | 天津航天长征火箭制造有限公司 | A kind of Ф 3350mm ellipsoids melon valve normal direction hole projecting apertures mould and technique |
| CN110153285A (en) * | 2019-06-03 | 2019-08-23 | 武汉重工铸锻有限责任公司 | For forming the mold of super pipeline heavy wall ozzle |
-
2019
- 2019-11-20 CN CN201911142891.3A patent/CN110814134A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2197146Y (en) * | 1994-07-06 | 1995-05-17 | 林锦钿 | Drilling model on an aluminium door-fram |
| CN105312380A (en) * | 2014-06-13 | 2016-02-10 | 首都航天机械公司 | Device and method for forming flange holes in large storage box |
| CN104043736A (en) * | 2014-06-25 | 2014-09-17 | 梧州恒声电子科技有限公司 | Flanging die of fixing frame |
| CN105396951A (en) * | 2015-12-14 | 2016-03-16 | 苏州源硕精密模具有限公司 | Reversely-arranged blanking and punching compound die |
| CN107030178A (en) * | 2017-06-16 | 2017-08-11 | 威海华邦精冲科技股份有限公司 | Ring shaped metal workpiece burr removal device |
| CN107695156A (en) * | 2017-10-13 | 2018-02-16 | 天津航天长征火箭制造有限公司 | A kind of Ф 3350mm ellipsoids melon valve normal direction hole projecting apertures mould and technique |
| CN110153285A (en) * | 2019-06-03 | 2019-08-23 | 武汉重工铸锻有限责任公司 | For forming the mold of super pipeline heavy wall ozzle |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290353A (en) * | 2021-06-07 | 2021-08-24 | 四川航天长征装备制造有限公司 | Method for forming small-aperture flanging convex hole of aluminum alloy top cover |
| CN113290353B (en) * | 2021-06-07 | 2022-07-26 | 四川航天长征装备制造有限公司 | Method for forming small-aperture flanging convex hole of aluminum alloy top cover |
| CN116000167A (en) * | 2023-01-16 | 2023-04-25 | 北京九天行歌航天科技有限公司 | A method of flanging the convex hole at the bottom of a rocket storage tank |
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Application publication date: 20200221 |
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