CN116900171A - Method for improving fin extension height and processing progressive die - Google Patents
Method for improving fin extension height and processing progressive die Download PDFInfo
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- CN116900171A CN116900171A CN202311043577.6A CN202311043577A CN116900171A CN 116900171 A CN116900171 A CN 116900171A CN 202311043577 A CN202311043577 A CN 202311043577A CN 116900171 A CN116900171 A CN 116900171A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000000750 progressive effect Effects 0.000 title claims abstract description 12
- 238000004080 punching Methods 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims description 42
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- Punching Or Piercing (AREA)
Abstract
The invention discloses a method for improving the extension height of fins and a processing progressive die, wherein the method for improving the extension height of fins comprises the steps of back stamping and stacking, primary forward extension, multi-step forward extension, punching and flanging and secondary flanging. Can be widely applied to the field of fin processing.
Description
Technical Field
The invention relates to the field of fin processing, in particular to a method for improving the extension height of fins and a processing progressive die.
Background
In the processing process of the fin, an extension procedure is arranged, and the required packing height and the required diameter are obtained through forward extension from large to small in multiple steps. The prior art is realized by adopting multiple forward extending and then punching, primary hole flanging and secondary flanging. With the increasing extension height, the front end of the spring is obviously thinned and is easy to tear, thereby causing failure. Thus, this position is the main reason for the limited extension height. Due to the consideration of cost, the processed aluminum foil is thinner and thinner, the fin height is higher and higher, and the existing process is adjusted to achieve higher stretching height, so that the purpose of reducing cost is achieved, and the method is one of the difficult problems puzzling fin processing.
Disclosure of Invention
The invention aims to provide a method for improving the extension height of fins and a processing progressive die, which solve the problems of low extension height and easy tearing and damage of the existing extension punching process.
The technical scheme adopted for solving the technical problems is as follows: a method of increasing fin extension height comprising the steps of:
1) Reverse punching and stacking: the metal sheet is subjected to reverse punching through a reverse punching sub-die to form a reverse convex hull, the end part of a reverse punching male die in the reverse punching sub-die is of a sphere structure, so that the material thickness of the reverse convex hull is gradually increased from the middle to the periphery, and a reverse convex hull structure with a thin bottom material thickness and a thick side wall material thickness is formed;
2) Primary forward extension: the reverse convex hull is subjected to forward extension once through a first forward extension sub-die to form a forward convex hull, the end part of a first forward extension male die in the first forward extension sub-die is of a spherical structure, and the diameter of the first forward extension male die is 75% -85% of the diameter of a reverse punching male die;
3) Multistep forward extension: performing multi-step extension on the forward extension to form a forward convex hull through a plurality of forward extension sub-molds sequentially, so that the extension height of the forward convex hull is continuously increased to obtain the forward convex hull with required height and diameter, and the diameters of the male molds of the plurality of forward extension sub-molds are arranged from large to small along the feeding direction and are smaller than the diameter of the first forward extension male mold;
4) Punching and flanging: punching the forward convex hulls after the multi-step forward extension by adopting a punching die and performing primary flanging;
5) Secondary flanging: and (3) carrying out secondary flanging on the basis of punching flanging to obtain fin holes with required heights.
Further, the height of the reverse punching stacking material is 10-15 times of the thickness of the material; the height of one forward extension is 20-30 times of the thickness of the material.
The invention also discloses a fin processing progressive die which comprises a reverse punching stacking station, a forward extending station, a punching flanging station and a secondary flanging station which are sequentially arranged; the reverse stamping stacking station is provided with a reverse stamping sub-die, the end part of a reverse stamping male die of the reverse stamping sub-die is of a sphere structure, the forward extending station comprises a plurality of forward extending sub-dies which are sequentially arranged, and the diameters of the forward extending male dies on the forward extending sub-dies are arranged from large to small along the feeding direction; the end part of the positive extension male die is of a spherical structure.
Further, the back stamping sub-die comprises a back stamping male die and a back forming hole, the height of the back stamping stacking material is 10-15 times of the material thickness, and the gap between the back forming hole and the back stamping male die is as follows: the material thickness is +0.7mm ~ 1mm.
The forward extension sub-die comprises a forward extension male die and a female die hole matched with the forward extension male die, the extension height of the first forward extension sub-die is 20-30 times of the material thickness, and the diameter of the corresponding first forward extension male die in the first forward extension sub-die is 75-85% of the diameter of the reverse punching male die.
The invention has the beneficial effects that: according to the invention, the reverse stamping stacking station is arranged before the fin stretching station, so that the material is extruded to the periphery under the action of the reverse stamping male die, a local thickening structure with the middle thinned and the periphery thickened is formed, and then forward stretching is performed. Because the reverse punching windrow thickens the forward extension thinned area in advance, the position is prevented from being torn due to over-thinness, and therefore, the sheet material can be higher in height through forward extension.
The invention will be described in more detail below with reference to the drawings and examples.
Drawings
Fig. 1 is an arrangement of the present invention.
Fig. 2 is an enlarged view of a portion of the reverse punch stacking station belt forming of the present invention.
FIG. 3 is an enlarged view of a portion of the belt formed after one forward extension in accordance with the present invention.
FIG. 4 is an enlarged view of a portion of the belt formed after the secondary flanging in the present invention.
Fig. 5 is a cross-sectional view of a fin processing progressive die reverse punch and forward extension sub-die of the present invention.
Detailed Description
Example 1: the fin processing progressive die comprises a reverse punching stacking station g1, forward extending stations g2-g6, a punching flanging station g7, a punching guide g8 and a secondary flanging station g9 which are sequentially arranged as shown in figures 1 to 5. The fin processing progressive die comprises an upper die assembly and a lower die assembly which are matched with each other, the upper die assembly comprises an upper die pad plate 100, a female die plate 200 arranged on the upper die pad plate 100, the lower die assembly comprises a male die fixing plate 300, a pressing plate 400 arranged on the male die fixing plate 300 and used for pressing a male die, and a discharging plate 500 arranged on the pressing plate 400. A reverse punching sub-die 1 is correspondingly arranged on the reverse punching stacking station g1, and the reverse punching sub-die 1 comprises a reverse punching male die 11 fixedly arranged on the female die plate 200 and a reverse forming hole 12 which is arranged on the stripper plate 500 and matched with the reverse punching male die 11. The end part of the reverse punching male die is of a spherical structure, the depth of the reverse forming hole 12 is 10-15 times of the thickness of the sheet, and the gap between the reverse forming hole 12 and the reverse punching male die is 0.7-1 mm in thickness, namely (diameter of the reverse forming hole 12-diameter of the end part of the reverse punching male die 11)/2=thickness of the material+0.7-1 mm. The matching structure of the reverse punching male die 11 and the reverse forming hole 12 enables the sheet material to be extruded and piled up around in the reverse punching process, and the thickness of the sheet material is gradually increased from the middle to the periphery, so that the reverse convex hull structure 10 with the thickness of the bottom material and the thickness of the side wall material is formed.
The forward extending stations comprise 5 specific stations, corresponding to each forward extending station from g2-g6, corresponding forward extending sub-dies 2 are arranged on the fin processing progressive die, each forward extending sub-die 2 comprises a forward extending male die 21 arranged on a male die fixing plate 300 and a female die hole 22 arranged on a female die plate 200 and matched with the forward extending male die 21, and the end part of each forward extending male die 21 is of a spherical structure. The size of the forward direction extending male die 21 is gradually reduced from the diameter of g2-g6, and the height is gradually increased, so that the sheet is gradually stretched to the required height, wherein the extending height of a first forward direction extending sub-die on a g2 station is 20-30 times of the thickness of the sheet, and the diameter of a corresponding first forward direction extending male die in the first forward direction extending sub-die is 75% -85% of the diameter of a reverse punching male die. The gaps between all the forward extending male dies 21 and the matched female die holes 22 are material thickness +0.3 mm-0.5 mm, namely (diameter of the end part of the forward extending male dies-diameter of the end part of the matched female die holes)/2=material thickness +0.3 mm-0.5 mm. In this embodiment, only 5 stretching stations are taken as an example, and the actual processing can be adjusted according to the specific height of the stretching. Typically in fin processing, the sheet material is 0.1-0.4mm thick.
The invention makes the extension male die 21 act on the thickest material thickness position of the reverse convex hull structure 10 during one forward extension, and stretches the material thickness position to form the forward convex hull 20. Since the region of greatest extension thinning is thickened by the reverse punching sub-die 1 before extension, the extension height can be effectively increased without tearing due to the excessive thinness of the material in the extension region.
Example 2: a method of increasing the fin extension height, as shown in fig. 1 to 5, comprising the steps of:
1) Reverse punching and stacking: the metal sheet is reverse punched by a reverse punching sub-die 1 to form a reverse convex hull, and the reverse punching sub-die 1 includes a reverse punching male die 11 and a reverse forming hole 12. The end part of the reverse punching male die 11 in the reverse punching sub-die is of a spherical structure, so that the material thickness of the reverse convex hull is gradually increased from the middle to the periphery to form a reverse convex hull structure 10 with a bottom material thickness and a side wall material thickness, the height of the reverse punching stacking is 10-15 times of the material thickness, and the gap between the reverse forming hole 12 and the reverse punching male die is +0.7mm-1 mm, namely (diameter of the reverse forming hole 12-diameter of the end part of the reverse punching male die 11)/2=material thickness +0.7mm-1 mm.
2) Primary forward extension: the forward extension sub-die 2 on the forward extension station g2 is used for carrying out forward extension on the reverse convex hull structure 10 once to form a forward convex hull 20, the forward extension sub-die 2 comprises a forward extension male die 21 and a female die hole 22 matched with the forward extension male die 21, the extension height of a first forward extension sub-die on the g2 station is 20-30 times of the thickness of the material, and the diameter of a corresponding first forward extension male die in the first forward extension sub-die is 75-85% of the diameter of the reverse punching male die.
3) Multistep forward extension: the forward convex hulls 20 formed by one forward extension are sequentially subjected to multi-step extension through a plurality of forward extension sub-molds g3-g6, so that the extension height of the forward convex hulls 20 is continuously increased, the forward convex hulls with required height and diameter are obtained, and the diameters of the convex molds of the plurality of forward extension sub-molds are arranged from large to small along the feeding direction and are smaller than the diameters of the forward extension convex molds on the g2 station; in g2-g6, the gaps between all the forward extending male dies 21 and the matched female die holes 22 are material thickness +0.3 mm-0.5 mm, namely (diameter of end part of the forward extending male dies-diameter of end part of the matched female die holes)/2=material thickness +0.3 mm-0.5 mm. In this embodiment, only 5 stretching stations are taken as an example, and the actual processing can be adjusted according to the specific height of the stretching. Typically in fin processing, the sheet material is 0.1-0.4mm thick.
4) Punching and flanging: punching the forward convex hulls after the multi-step forward extension by adopting a punching die and performing primary flanging;
5) Secondary flanging: and (3) carrying out secondary flanging on the basis of punching flanging to obtain fin holes with required heights. And a punching and correcting procedure is further arranged after the step 4), so that the secondary flanging in the step 5) is facilitated.
The steps 4) and 5) are conventional process steps in fin formation, and are not described in detail herein.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (5)
1. A method of increasing the extension height of a fin, comprising the steps of:
1) Reverse punching and stacking: the metal sheet is subjected to reverse punching through a reverse punching sub-die to form a reverse convex hull, the end part of a reverse punching male die in the reverse punching sub-die is of a sphere structure, so that the material thickness of the reverse convex hull is gradually increased from the middle to the periphery, and a reverse convex hull structure with a thin bottom material thickness and a thick side wall material thickness is formed;
2) Primary forward extension: the method comprises the steps that forward extension is carried out on a reverse convex hull for one time through a first forward extension sub-die to form a forward convex hull, the end part of a first forward extension male die in the first forward extension sub-die is of a spherical structure, and the diameter of the first forward extension male die is 75% -85% of the diameter of a reverse stamping male die;
3) Multistep forward extension: performing multi-step extension on the forward extension to form a forward convex hull through a plurality of forward extension sub-molds sequentially, so that the extension height of the forward convex hull is continuously increased to obtain the forward convex hull with required height and diameter, and the diameters of the male molds of the plurality of forward extension sub-molds are arranged from large to small along the feeding direction and are smaller than the diameter of the first forward extension male mold;
4) Punching and flanging: punching the forward convex hulls after the multi-step forward extension by adopting a punching die and performing primary flanging;
5) Secondary flanging: and (3) carrying out secondary flanging on the basis of punching flanging to obtain fin holes with required heights.
2. The method for increasing the fin extension height as set forth in claim 1, wherein: the height of the reverse punching stacking material is 10-15 times of the thickness of the material; the height of one forward extension is 20-30 times of the thickness of the material.
3. The utility model provides a fin processing upgrades mould which characterized in that: the device comprises a reverse punching stacking station, a forward extending station, a punching flanging station and a secondary flanging station which are sequentially arranged; the reverse stamping stacking station is provided with a reverse stamping sub-die, the end part of a reverse stamping male die of the reverse stamping sub-die is of a sphere structure, the forward extending station comprises a plurality of forward extending sub-dies which are sequentially arranged, and the diameters of the forward extending male dies on the forward extending sub-dies are arranged from large to small along the feeding direction; the end part of the positive extension male die is of a spherical structure.
4. The fin processing progressive die of claim 3, wherein: the reverse punching sub-die comprises a reverse punching male die and a reverse forming hole, the height of the reverse punching stacking material is 10-15 times of the material thickness, and the gap between the reverse forming hole and the reverse punching male die is as follows: the material thickness is +0.7mm ~ 1mm.
5. The fin processing progressive die of claim 3, wherein: the forward extension sub-die comprises a forward extension male die and a female die hole matched with the forward extension male die, the extension height of the first forward extension sub-die is 20-30 times of the material thickness, and the diameter of the corresponding first forward extension male die in the first forward extension sub-die is 75-85% of the diameter of the reverse punching male die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311043577.6A CN116900171A (en) | 2023-08-17 | 2023-08-17 | Method for improving fin extension height and processing progressive die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311043577.6A CN116900171A (en) | 2023-08-17 | 2023-08-17 | Method for improving fin extension height and processing progressive die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116900171A true CN116900171A (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311043577.6A Pending CN116900171A (en) | 2023-08-17 | 2023-08-17 | Method for improving fin extension height and processing progressive die |
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| Country | Link |
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| CN (1) | CN116900171A (en) |
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2023
- 2023-08-17 CN CN202311043577.6A patent/CN116900171A/en active Pending
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