CN114011960B - Deep-drawing stamping forming process for L-shaped thin metal shell - Google Patents
Deep-drawing stamping forming process for L-shaped thin metal shell Download PDFInfo
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- CN114011960B CN114011960B CN202111133778.6A CN202111133778A CN114011960B CN 114011960 B CN114011960 B CN 114011960B CN 202111133778 A CN202111133778 A CN 202111133778A CN 114011960 B CN114011960 B CN 114011960B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002184 metal Substances 0.000 title claims abstract description 33
- 239000011265 semifinished product Substances 0.000 claims abstract description 127
- 238000007493 shaping process Methods 0.000 claims abstract description 71
- 239000000047 product Substances 0.000 claims abstract description 62
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 238000004080 punching Methods 0.000 claims description 15
- 238000005452 bending Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 10
- 239000007769 metal material Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
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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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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 deep drawing and stamping forming process of an L-shaped appearance thin material metal shell, which comprises the steps of transversely expanding a product to be stamped to obtain an expanded appearance of a blank to be stretched, ensuring that the top surface, the side wall and the flange of a stretched semi-finished product are provided with enough metal materials capable of being covered in the deep drawing process, sequentially carrying out twice deep drawing and forming on the stretched blank with preset stretching heights to obtain a stretched semi-finished product, stretching the blank to the preset height by two times of deep drawing, preventing the flange edge at the inner concave angle of the side wall of the semi-finished product from being broken in the deep drawing process, reducing the deformation of the top surface at the inner concave angle of the side wall, and finally shaping and cutting the top surface, the side wall and the flange edge of the stretched semi-finished product to obtain the stretched semi-finished product; the blank material is stretched and the semi-finished product is stretched twice in sequence, so that the stretching stress of the concave angle of the side wall of the finished product is greatly reduced, the stress deformation of the top surface of the concave angle of the side wall of the finished product can be reduced, and the flange edge at the concave angle of the side wall of the finished product can be prevented from being broken.
Description
Technical Field
The invention relates to the technical field of deep drawing and stamping forming processes, in particular to a deep drawing and stamping forming process for an L-shaped appearance thin metal shell.
Background
With the development of electronic products, battery products corresponding to the electronic products also have various shapes. The outer shell of the battery product corresponding to the electronic product is usually prepared by deep drawing of metal. Namely, the plate-shaped metal material is deformed into a cylindrical or box-shaped shell part by using a stamping, pull ring or metal mold process. Therefore, the deep drawing technology is widely applied to the production of battery case products of electronic devices.
However, in the deep drawing process of a battery case having a special shape with concave corners on some side walls, stress deformation occurs in the product due to the fact that the top surface at the concave corners of the side walls of the product may be upwardly arched. And a battery product is a device for storing electric energy, which causes a problem of poor assembly of the compact assembly of the electronic product when there is a stress deformation.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the deep drawing and stamping forming process for the L-shaped thin metal shell reduces stress deformation generated on the top surface of the concave corner of the side wall of the product, and can prevent the flange edge of the concave corner of the side wall from generating tensile fracture.
In order to solve the technical problems, the invention adopts the following technical scheme:
A deep drawing and stamping process for an L-shaped thin metal shell comprises the following steps:
Transversely expanding the product to be punched to obtain the expanded shape of the blank to be stretched, and punching the shape to form;
sequentially carrying out deep drawing forming on the drawn blank twice at a preset drawing height to obtain a drawn semi-finished product; the stretched semi-finished product comprises a top surface, side walls and flange edges;
and shaping and cutting the stretched semi-finished product in sequence to obtain a stretched finished product.
The invention has the beneficial effects that: transversely expanding a product to be punched to obtain an expanded shape of a blank to be stretched, punching the shape to form the expanded shape, ensuring that the top surface, the side wall and the flange edge of a stretched semi-finished product are provided with enough metal materials which can be covered in the deep drawing process, sequentially carrying out deep drawing forming on the stretched blank twice with a preset stretching height to obtain a stretched semi-finished product, and shaping and cutting the top surface, the side wall and the flange edge of the stretched semi-finished product to obtain a stretched finished product; the blank is stretched to a preset height through two deep drawing processes of blank stretching and semi-finished product secondary stretching in sequence, so that the stretching stress of the concave angle part of the side wall of the finished product is greatly reduced, the stress deformation of the top surface of the concave angle part of the side wall of the finished product can be reduced, and the flange edge at the concave angle part of the side wall of the finished product can be prevented from being broken.
Drawings
FIG. 1 is a flow chart showing the steps of a deep drawing and stamping process for forming a thin L-shaped metal shell according to an embodiment of the present invention;
FIG. 2 is a process flow diagram of a deep drawing, stamping and forming process for an L-shaped profile sheet metal shell in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of a stretched blank of a deep drawing and stamping process for forming a thin metal shell with an L-shaped profile according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell after six steps are completed;
FIG. 9 is a schematic cross-sectional view of a semi-finished product corresponding to a deep-drawing, stamping and forming process of an L-shaped thin metal shell after seven steps are completed;
Fig. 10 is a schematic structural diagram of a screw trimming die corresponding to a step ten of a deep drawing and stamping process for forming a thin metal shell with an L-shaped profile according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a screw trimming die corresponding to a step eleven of a deep drawing and stamping process for forming a thin L-shaped metal shell according to an embodiment of the present invention;
FIG. 12 is a schematic view of the structure of a semi-finished product after the first drawing of the deep drawing and stamping process for forming a thin L-shaped metal shell according to an embodiment of the present invention;
FIG. 13 is a schematic view of the structure of a second stretched semi-finished product of the deep drawing and stamping process of an L-shaped thin metal shell according to an embodiment of the present invention;
FIG. 14 is a graph showing the deformation trend of the product and the deformation trend of the product without improvement according to the embodiment of the present invention;
Description of the reference numerals:
1. A top surface; 2. a flange edge; 3. a sidewall.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a deep drawing and stamping process for forming a thin metal shell with an L-shaped profile includes the steps of:
transversely expanding the product to be punched to obtain the expanded shape of the stretched blank, and punching the shape to form;
sequentially carrying out deep drawing forming on the drawn blank twice at a preset drawing height to obtain a drawn semi-finished product; the stretched semi-finished product comprises a top surface, side walls and flange edges;
and shaping and cutting the stretched semi-finished product in sequence to obtain a stretched finished product.
The invention has the beneficial effects that: transversely expanding a product to be punched to obtain an expanded shape of a stretched blank, punching the shape to form the stretched shape, ensuring that the top surface, the side wall and the flange edge of a stretched semi-finished product are provided with enough metal materials capable of being covered in the deep drawing process, sequentially carrying out deep drawing forming on the stretched blank for two times at a preset stretching height to obtain the stretched semi-finished product, and shaping and cutting the top surface, the side wall and the flange edge of the stretched semi-finished product to obtain the stretched finished product; the blank is stretched to a preset height through two deep drawing processes of blank stretching and semi-finished product secondary stretching in sequence, so that the stretching stress of the concave angle part of the side wall of the finished product is greatly reduced, the stress deformation of the top surface of the concave angle part of the side wall of the finished product can be reduced, and the flange edge at the concave angle part of the side wall of the finished product can be prevented from being broken.
Further, the step of sequentially performing two times of deep drawing forming on the drawn blank at a preset drawing height to obtain a drawn semi-finished product includes:
deep stretching the stretched blank for the first time at a first preset height to obtain a pre-stretched semi-finished product, and forming the top surface, the side wall and the flange edge;
And bending the flange edge of the pre-stretched semi-finished product subjected to the first deep stretching, and performing the second deep stretching on the pre-stretched semi-finished product at a second preset height.
As can be seen from the above description, after the stretched blank is deep stretched for the first time at the first preset height, the flange edge of the pre-stretched semi-finished product after the first deep stretching is bent first, and after the fluidity of the flange edge of the product is locked, the flange edge of the pre-stretched semi-finished product is stretched for the second time at the second preset height, so that the top surface metal material of the pre-stretched semi-finished product is more easily stretched out, and poor stress deformation of the top surface at the concave angle of the side wall of the stretched semi-finished product and poor cracking of the flange edge are avoided.
Further, the first preset height is 4.30-4.40 mm;
the second preset height is set to be 4.70-4.80 mm.
From the above description, the first preset height is set to be 4.30-4.40 mm, which is 0.30-0.50 mm lower than the second preset height, so that the stretching amount of 0.30-0.50 mm can be ensured during the secondary stretching, the top surface metal material of the semi-finished product can be just stretched out during the secondary stretching, and the poor stress deformation and the poor flange edge cracking of the top surface at the concave angle of the side wall of the stretched product are avoided; meanwhile, the second preset height is set to be 4.70-4.8 mm, so that the shell volume of the protruding part of the semi-finished product after the secondary deep drawing is basically equal to the shell volume of the protruding part of the drawn product, and the defect caused by the shortage of metal materials of the protruding part of the drawn semi-finished product shell can be avoided when the drawn semi-finished product is shaped in the subsequent process.
Further, the shaping comprises fillet R-shrinking shaping and flange edge plane shaping.
From the above description, it can be seen that the products are shaped by the R-shrinking shaping of the rounded corners and the planar shaping of the flange edges, so that the products with the required dimensions can be obtained, and the overall flatness of the products is improved.
Further, the fillet R-shrink shaping includes:
and reducing the semi-diameters of the inner side fillet of the top surface and the outer side fillet of the flange edge of the stretched semi-finished product to preset sizes by using a mould part with a preset reduced radius size twice.
It can be seen from the above description that the fillet shrinkage R shaping is performed on the stretched semi-finished product by dividing, the semi-finished product top fillet half-size and the flange edge fillet half-size are changed in a progressive manner, so that the product top fillet and the flange edge fillet are prevented from being broken due to the shape change of the greatly reduced R, and the deformation of the flange edge fillet and the top fillet due to the stress is reduced by shaping twice.
Further, the flange edge plane shaping includes: and sequentially shaping the plane of the whole circumferential flange edge of the stretched semi-finished product twice by using a die part with a preset angle conical surface and a preset height level difference.
As is apparent from the above description, since the flange of the drawn semi-finished product after R-shaping is separated from the outer peripheral side of the sidewall to generate upward buckling wavy deformation, the upward buckling wavy deformation generated on the outer peripheral side of the flange plane is reduced by shaping the entire peripheral flange plane of the drawn semi-finished product twice with the mold part having the predetermined angle conical surface and the predetermined height level difference.
Further, the flange edge plane shaping further comprises:
And carrying out primary flange plane shaping on the whole circumferential flange of the stretched semi-finished product by using the die part with the preset angle of 6-7 degrees and the preset height of 0.50-0.60 mm.
From the above description, the shaping of the whole circumferential flange of the stretched semi-finished product is performed by using the die parts with the conical surface with the preset angle of 6-7 degrees and the preset height of 0.50-0.60 mm, so that not only the redundant materials on the outer circumferential side of the flange plane of the stretched semi-finished product can be absorbed, but also the reverse compensation shaping of the buckling deformation on the outer circumferential side of the flange plane of the stretched semi-finished product can be realized.
Further, the flange edge plane shaping further comprises:
and carrying out secondary plane shaping on the flange edge of the whole circumference of the stretched semi-finished product by using the die part with the preset angle of 2-3 degrees and the preset height of 0.50-0.60 mm.
From the above description, it is known that the reverse compensation shaping of the warp deformation on the flange plane outer peripheral side of the stretched semi-finished product is further realized by shaping the die part with the tapered surface of 6 to 7 degrees at the preset angle and then shaping the die part with the tapered surface of 2 to 3 degrees at the preset angle.
Further, the cutting of the stretched semi-finished product comprises:
Cutting off the step edge of the stretched semi-finished product after the flange edge plane shaping;
punching the side wall of the stretched semi-finished product;
And cutting the appearance of the stretched semi-finished product along the flange edge to obtain the stretched finished product.
As can be seen from the above description, the product is separated from the blank to obtain a final product by sequentially performing step edge cutting, punching and profile cutting on the stretched semi-finished product, so that the effect of fine adjustment of screws to carry out plane shaping on the flange edge of the stretched semi-finished product due to the rigidity of step is avoided;
further, the method is characterized in that the step of cutting the shape of the stretched semi-finished product to obtain the stretched finished product further comprises the following steps: and carrying out plane shaping on the top surface and the flange edge of the stretched semi-finished product through fine adjustment of screws.
From the above description, the top surface and the flange edge of the stretched semi-finished product are shaped by fine adjustment of screws, so that the flatness of the top surface and the flange edge of the product is further improved.
The deep drawing and stamping process for the L-shaped thin-material metal shell can be suitable for application scenes of deep drawing of the L-shaped thin-material metal shell with the inner concave angle on the side wall, such as deep drawing of a mobile phone battery shell, and the side wall of the battery shell is in an L-shaped inner concave angle shape due to the requirements of the mobile phone on the compactness of the structure and the maximization of the battery capacity; the following description is made on the specific implementation mode of the deep drawing and stamping forming process of the mobile phone battery case with the L-shaped side wall and the concave angle shape:
Example 1
Referring to fig. 1, a deep drawing and stamping process for forming a thin metal shell with an L-shaped profile includes:
step A1, transversely expanding a product to be punched to obtain an expanded shape of a blank to be stretched and punching the shape;
Specific: cutting the metal plate to be punched into stretched blanks and a material frame in an unfolding shape step by step; the material frame is connected with the stretched blank through an elastic fine metal wire belt and is used for positioning and carrying the stretched blank and the stretched semi-finished product;
Step A2, sequentially carrying out deep drawing forming on the drawn blank twice at a preset drawing height to obtain a drawn semi-finished product;
Specific: carrying out first deep drawing on the drawn blank with a first preset height to form the top surface 1, the flange edge 2 and the side wall 3; bending the flange edge 2 of the pre-stretched semi-finished product subjected to the first deep stretching, and performing the second stretching on the stretched semi-finished product at a second preset height; the first preset height is 4.30-4.40 mm and is 0.30-0.50 mm lower than the second preset height; the second preset height is set to be 4.70-4.80 mm; the first preset height and the second preset height are obtained through computer simulation calculation, so that the shell volume of the protruding part of the stretched semi-finished product after the secondary deep drawing is equal to the shell volume of the protruding part of the stretched finished product;
step A3, shaping and cutting the stretched semi-finished product in sequence to obtain a stretched finished product;
Specific: firstly, sequentially carrying out fillet R shrinkage shaping and flange edge plane shaping on the stretched semi-finished product; cutting off the step difference edges of the stretched semi-finished product after the twice shaping; then punching the side wall of the stretched semi-finished product; finally, cutting the appearance of the stretched semi-finished product along the flange edge 2 to obtain the stretched finished product;
in an alternative embodiment, the drawing semi-finished product is cut out of its shape, and the deep drawing finished product is obtained by the steps of: and carrying out plane shaping on the top surface of the stretched semi-finished product and the flange edge 2 through fine adjustment of screws.
Example two
The first embodiment is different from the first embodiment in that the steps of fillet R-shrink shaping and flange edge plane shaping are defined;
The R-shaping comprises: simultaneously shaping the size of a fillet radius Rp of the top surface 1 and the size of a fillet radius Rd of the flange edge 2 of the stretched semi-finished product twice respectively by a mould part with a preset reduced fillet radius size;
The flange edge plane shaping comprises the following steps: sequentially performing two times of inverse compensation shaping on the planeness of the flange edge 2 of the stretched semi-finished product by using a die part with a preset angle conical surface and a preset height section difference;
Carrying out primary plane shaping on the flange 2 of the stretched semi-finished product around the whole circumference by using a die part with the preset angle of 6-7 degrees and the preset height of 0.50-0.60 mm; secondly, carrying out the flange edge plane shaping on the flange edge 2 of the stretched semi-finished product by using a die part with the preset angle of 2-3 degrees and the preset height of 0.50-0.60 millimeter step (the height is the same as that of the previous step); the preset angle is a rotation angle of the flange edge 2 in a direction away from the top surface 1; the preset height is the height difference between one end of the flange edge 2 far away from the side wall 3 and the section difference surface;
in a specific process step, the step S1 is a first process step: punching and forming the stretched blank in steps according to the unfolding shape;
the step S2 is a step two: carrying out first deep drawing on the drawn blank at a first preset height;
the step S3 is a step three: secondarily stretching the pre-stretched semi-finished product at a second preset height;
The step S4 is a step four: carrying out first round corner shrinkage R shaping on the stretched semi-finished product;
the step S5 is a step five: carrying out secondary fillet R shrinkage shaping on the stretched semi-finished product;
the step S6 is a step six: carrying out primary plane shaping on the flange edge 2 of the stretched semi-finished product;
The step S7 is a step seven: carrying out secondary plane shaping on the flange edge 2 of the stretched semi-finished product;
the step S8 is a step eight: cutting off the step difference edge of the flange edge 2 of the stretched semi-finished product;
The step S9 is a step nine: punching the side surface of the stretched semi-finished product to be used as the anode and the cathode of the battery shell;
The step S10 is a step ten: carrying out fine plane adjustment shaping on the top surface 1 of the stretched semi-finished product through screws;
the step S11 is a step eleven: carrying out fine plane adjustment shaping on the flange edge 2 of the stretched semi-finished product through screws;
the step S12 is a step twelve: and cutting the appearance of the stretched semi-finished product along the flange edge 2 to obtain the deep-drawn finished product.
Example III
The embodiment provides a specific process for preparing the product, if the battery case with the L-shaped side wall and the concave angle shape is required to be prepared, the thickness of the battery case is 0.10mm, and the stretching height is 4.30mm; the product material is SUS316;
referring to fig. 2, 3 and 12, step one S1: punching the shape and the material frame of the stretched blank material, and punching positioning holes; the shape of the stretched blank is reserved with a bending area, and the shape of the stretched blank can be adjusted according to actual requirements; as shown in fig. 3, the stretched blank after being stretched has an outer shape;
Referring to fig. 2, 4 and 12, step two S2: deep drawing and forming for the first time; deep-stretching the stretched blank with the preset height of 4.30-4.40mm until the stretched blank reaches the first preset height; as shown in fig. 4, the stretching height reaches 4.35mm (the stretching height can be adjusted slightly according to practical situations), the radius Rp of the inner side fillet at the junction of the top surface 1 and the side wall 3 is 1.20mm, and the radius Rd of the outer side fillet at the junction of the flange 2 and the side wall 3 is 0.80mm;
referring to fig. 2, 5 and 13, step three S3: deep drawing and forming for the second time; bending the flange edge 2, and performing secondary deep drawing on the pre-drawn semi-finished product subjected to primary drawing at the preset drawing height of 4.70-4.80mm until the pre-drawn semi-finished product reaches the second preset height; as shown in fig. 5, the stretching height reaches 4.75mm, the radius Rp of the inner side fillet at the junction of the top surface 1 and the side wall 3 is 1.20mm, and the radius Rd of the outer side fillet at the junction of the flange edge 2 and the side wall 3 is 0.80mm;
Referring to fig. 2 and 6, step four S4: carrying out first round corner shrinkage R shaping on the stretched semi-finished product; as shown in fig. 6, the inner rounded corner radius Rp at the junction of the top surface 1 and the side wall 3 of the stretched semi-finished product is reduced to 1.0mm, the outer rounded corner radius Rd at the junction of the flange edge 2 and the side wall 3 of the stretched semi-finished product is reduced to 0.40mm, and the stretched height of the stretched semi-finished product is reduced to 4.50mm;
Referring to fig. 2 and 7, step five S5: carrying out secondary fillet R shrinkage shaping on the stretched semi-finished product; as shown in fig. 7, the inner rounded corner radius Rp at the junction of the top surface 1 and the side wall 3 of the stretched semi-finished product is reduced to 0.80mm, the outer rounded corner radius Rd at the junction of the flange edge 2 and the side wall 3 of the stretched semi-finished product is reduced to 0.20mm, and the stretched height of the stretched semi-finished product is reduced to 4.35mm;
Referring to fig. 2 and 8, step six S6: carrying out primary flange plane shaping on the whole circumferential flange 2 of the stretched semi-finished product by using the die part with the preset angle of 6 degrees and the preset height of 0.60 millimeter section difference; as shown in fig. 8, the stretching height of the stretched semi-finished product and the outer rounded corner Rd at the junction of the flange edge 2 and the side wall 3 are unchanged, while the inner rounded corner semi-finished product at the junction of the top surface 1 and the side wall 3 is reduced to 0.65mm by Rp;
Referring to fig. 2 and 9, step seven S7: carrying out secondary flange plane shaping on the whole circumferential flange 2 of the stretched semi-finished product by using a die part with the preset angle of 3 degrees and the preset height of 0.60 millimeter (the height is the same as that of the previous step); as shown in fig. 9, the stretching height of the stretched semi-finished product is reduced to 4.30mm, the outer round angle Rd at the junction of the flange edge 2 and the side wall 3 is reduced to 0.16mm, and the inner round angle half line Rp at the junction of the top surface 1 and the side wall 3 is reduced to 0.60mm;
Referring to fig. 2, step eight S8: cutting off the step difference edge of the flange edge 2 of the stretched semi-finished product;
referring to fig. 2, step nine S9: punching the side wall of the stretched semi-finished product to be used as the anode and the cathode of the battery shell;
Referring to fig. 2, 10 and 11, step S10: performing fine plane adjustment and shaping on the top surface 1 of the stretched semi-finished product through screws, wherein the circle is the position of the shaping screw in a overlooking state;
Referring to fig. 2, 10 and 11, step eleven S11: carrying out fine plane adjustment and shaping on the flange edge 2 of the stretched semi-finished product through screws, wherein the circle is the position of the shaping screw in a overlooking state;
referring to fig. 2, 10 and 11, step twelve S12: cutting the appearance of the stretched semi-finished product along the flange edge 2 to obtain the deep-drawn finished product;
Referring to fig. 14, the battery case product with the L-shaped appearance with the concave angle on the side wall with the stretching height of 4.30mm is finally obtained through the above process steps, the upward arch deformation flatness of the top surface at the concave angle of the L-shaped side wall is reduced from 0.70-0.90mm to within 0.23-0.33mm, the stress deformation of the top surface at the concave angle of the L-shaped side wall is greatly reduced, and meanwhile, the cracking defect of the flange edge at the concave angle of the L-shaped side wall is avoided.
In summary, according to the deep drawing and stamping process for the L-shaped thin metal shell, a product to be stamped is transversely unfolded, and the metal plate to be stamped is cut into the stretched blank in an unfolding shape step by step according to the unfolding shape, so that the shape and the size of the stretched blank are ensured to have enough metal materials capable of covering the top surface, the side wall and the flange edge in the deep drawing process, and then the blank to be stretched is sequentially subjected to two times of deep drawing forming at a preset stretching height to obtain a stretched semi-finished product, and the blank to be stretched is stretched to the preset height by two times of deep drawing, so that the flange edge at the concave angle of the side wall of the semi-finished product is prevented from being broken in the stretching process, and the deformation of the top surface at the concave angle of the side wall is reduced. And then, the drawing semi-finished product is subjected to twice fillet R shrinkage shaping and twice flange edge plane shaping respectively, so that the tensile stress at the concave angle of the side wall of the deep drawing finished product is greatly reduced, and the height of the product is shaped to the final required height. And finally, fine adjustment is carried out on the top surface plane and the flange edge plane of the product through screws, so that the top surface and the flange edge of the product have better plane, and the quality of the product is improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (5)
1. A deep drawing and stamping process for an L-shaped thin metal shell is characterized by comprising the following steps:
Transversely expanding the product to be punched to obtain the expanded shape of the blank to be stretched, and punching the shape to form;
sequentially carrying out deep drawing forming on the drawn blank twice at a preset drawing height to obtain a drawn semi-finished product; the stretched semi-finished product comprises a top surface, side walls and flange edges;
Shaping and cutting the stretched semi-finished product in sequence to obtain a stretched finished product;
Sequentially carrying out deep drawing forming on the drawn blank twice at a preset drawing height to obtain a drawn semi-finished product, wherein the drawing semi-finished product comprises the following components:
deep stretching the stretched blank for the first time at a first preset height to obtain a pre-stretched semi-finished product, and forming the top surface, the side wall and the flange edge;
bending the flange edge of the pre-stretched semi-finished product subjected to the first deep stretching, and performing the second deep stretching on the pre-stretched semi-finished product at a second preset height;
the first preset height is 4.30-4.40 mm;
The second preset height is set to be 4.70-4.80 mm;
The shaping comprises fillet R-shrinking shaping and flange edge plane shaping;
the fillet shrink R shaping comprises:
Shrinking the top surface inner side fillet and the flange side outer side fillet half of the stretched semi-finished product to preset sizes by a mould part with preset radius reducing size;
The flange edge plane shaping comprises the following steps: and sequentially shaping the plane of the whole circumferential flange edge of the stretched semi-finished product twice by using a die part with a preset angle conical surface and a preset height level difference.
2. The process for deep drawing and stamping a thin L-shaped metal shell according to claim 1, wherein the shaping of the flange edge plane further comprises:
And carrying out primary flange plane shaping on the whole circumferential flange of the stretched semi-finished product by using the die part with the preset angle of 6-7 degrees and the preset height of 0.50-0.60 mm.
3. The process for deep drawing and stamping a thin L-shaped metal shell according to claim 2, wherein the planar shaping of the flange edge further comprises:
and carrying out secondary plane shaping on the flange edge of the whole circumference of the stretched semi-finished product by using the die part with the preset angle of 2-3 degrees and the preset height of 0.50-0.60 mm.
4. The process of deep drawing and stamping an L-profile sheet metal shell as set forth in claim 1, wherein cutting the drawn semi-finished flange edge comprises:
cutting off the step difference edge of the stretched semi-finished product after the flange edge plane shaping;
punching the side wall of the stretched semi-finished product;
And cutting the appearance of the stretched semi-finished product along the flange edge to obtain the stretched finished product.
5. The process for deep drawing and stamping a thin L-shaped metal shell according to claim 4, wherein the step of cutting the shape of the drawn semi-finished product to obtain the drawn finished product further comprises: and carrying out plane shaping on the top surface and the flange edge of the stretched semi-finished product through fine adjustment of screws.
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Citations (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472955A (en) * | 1982-04-20 | 1984-09-25 | Amino Iron Works Co., Ltd. | Metal sheet forming process with hydraulic counterpressure |
| JPH03221218A (en) * | 1989-11-13 | 1991-09-30 | Toyo Seikan Kaisha Ltd | Re-drawing method for cup with flange |
| JPH09161736A (en) * | 1995-12-01 | 1997-06-20 | Kishimoto Akira | Battery can and manufacture thereof |
| JP2001006944A (en) * | 1999-06-21 | 2001-01-12 | Aichi Electric Co Ltd | Case for oil-sealed electric appliance, method and apparatus for manufacturing the same |
| JP2002155394A (en) * | 2000-11-14 | 2002-05-31 | Toyo Kohan Co Ltd | Surface-treated steel plate for battery case, method of manufacturing surface-treated steel plate for battery case, and battery case |
| JP2002170529A (en) * | 2000-12-01 | 2002-06-14 | Hara Press Engineering:Kk | Battery case, blank for battery case and manufacturing method for the battery case |
| JP2002254115A (en) * | 2001-03-02 | 2002-09-10 | Ace Kk | Magnesium alloy made hard case and its manufacturing method |
| JP2003242936A (en) * | 2002-02-15 | 2003-08-29 | Sanyo Electric Co Ltd | Battery |
| JP2004115066A (en) * | 2002-09-26 | 2004-04-15 | Kureha Chem Ind Co Ltd | Deep drawing packaging method and slightly shrinkable film for deep drawing packaging |
| JP2004146252A (en) * | 2002-10-25 | 2004-05-20 | Sony Corp | Forming method of battery outer packaging, and forming device of battery outer packaging |
| US6929880B1 (en) * | 1999-05-07 | 2005-08-16 | Matsushita Electric Industrial Co., Ltd. | Square cell container and method of manufacturing the cell container |
| JP2005319482A (en) * | 2004-05-10 | 2005-11-17 | Nisshin Steel Co Ltd | Manufacturing method for metallic muffler shell |
| JP2006289480A (en) * | 2005-04-14 | 2006-10-26 | Aida Eng Ltd | Press forming method and metal mold used for the same |
| JP2008095609A (en) * | 2006-10-12 | 2008-04-24 | Toyota Motor Corp | Method of manufacturing housing for fuel injection valve, and vehicular fuel injection valve manufactured by the method |
| JP2009113058A (en) * | 2007-11-02 | 2009-05-28 | Advan Eng Kk | Method of and apparatus for forming prismatic container made of austenitic stainless steel, and prismatic container |
| JP2011200932A (en) * | 2010-03-26 | 2011-10-13 | Kobe Steel Ltd | Method for manufacturing press-formed product of light metal alloy |
| CN102513451A (en) * | 2011-12-25 | 2012-06-27 | 上海工程技术大学 | Upper support frame punching process of automobile steering column and bending punching work procedure mold structure thereof |
| CN103573465A (en) * | 2013-11-11 | 2014-02-12 | 泉州市双塔汽车零件有限公司 | Cylinder head cover and manufacturing process thereof |
| CN103586333A (en) * | 2012-08-14 | 2014-02-19 | 冯宪平 | Sheet metal composite punching process and die |
| CN103752685A (en) * | 2013-10-09 | 2014-04-30 | 江苏大学 | Stamping method of multi-station efficient high-precision automobile covering part |
| CN103801608A (en) * | 2014-02-25 | 2014-05-21 | 马鞍山市蓝华机械制造有限公司 | Small flange tubular part non-thinning drawing process |
| CN104080555A (en) * | 2012-01-12 | 2014-10-01 | 蒂森克虏伯钢铁欧洲股份公司 | Device and method for the deep drawing of shell parts with integrated head and frame trimming |
| CN104138954A (en) * | 2014-06-25 | 2014-11-12 | 梧州恒声电子科技有限公司 | Tension fracture preventing drawing process for rectangular sheet metal parts |
| JP2014233755A (en) * | 2013-06-05 | 2014-12-15 | 株式会社神戸製鋼所 | Forming method of square battery case |
| RU2013129195A (en) * | 2013-06-25 | 2014-12-27 | Открытое акционерное общество "АВТОВАЗ" | METHOD FOR MULTI-OPERATION EXTRACTION OF A BOX DETAILS FROM SHEET |
| CN104364029A (en) * | 2012-06-07 | 2015-02-18 | 东洋制罐集团控股株式会社 | Deep draw moulding method and moulding metal die therefor |
| CN204638887U (en) * | 2015-04-10 | 2015-09-16 | 鹤壁职业技术学院 | A kind of mutiprogramming design composite forming die |
| CN204713747U (en) * | 2014-03-31 | 2015-10-21 | 昭和电工包装株式会社 | The preservation container of micro-wave oven |
| JP2015197964A (en) * | 2014-03-31 | 2015-11-09 | 株式会社神戸製鋼所 | Method for molding square battery case |
| CN105522073A (en) * | 2016-02-25 | 2016-04-27 | 烟台开元模具股份有限公司 | Forming technique for small rounded corner of stainless steel automobile silencer shell flange |
| CN105964782A (en) * | 2016-06-08 | 2016-09-28 | 深圳市信维通信股份有限公司 | Shielding cover frame and manufacturing process thereof |
| WO2017145856A1 (en) * | 2016-02-22 | 2017-08-31 | 日新製鋼株式会社 | Molding material production method and molding material thereof |
| WO2019008880A1 (en) * | 2017-07-06 | 2019-01-10 | Ｊｆｅスチール株式会社 | Press forming method |
| CN109604472A (en) * | 2018-12-09 | 2019-04-12 | 中国航发南方工业有限公司 | A kind of sleeve manufacturing process |
| JP2019171440A (en) * | 2018-03-29 | 2019-10-10 | Ｊｆｅスチール株式会社 | Press forming method |
| JP2019212541A (en) * | 2018-06-07 | 2019-12-12 | 昭和電工パッケージング株式会社 | Deep drawing molding case for electrical storage device exterior package and the electrical storage device |
| CN110899449A (en) * | 2019-11-20 | 2020-03-24 | 河北华曙新能源汽车科技有限公司 | Deep drawing process for battery box |
| CN111266457A (en) * | 2020-01-17 | 2020-06-12 | 湖南徕木电子有限公司 | Stamping and deep-drawing preparation method of shielding case |
| KR102139805B1 (en) * | 2020-04-27 | 2020-07-31 | (주)대화정공 | Manufacturing method of automotive air suspension housing |
| CN112168049A (en) * | 2019-11-01 | 2021-01-05 | 高野朗 | Cover part |
| CN112474984A (en) * | 2020-09-30 | 2021-03-12 | 成都飞机工业（集团）有限责任公司 | Method for deep drawing and forming sheet metal part of airplane cap-shaped fairing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7913372B2 (en) * | 2006-12-21 | 2011-03-29 | Meyer Intellectual Properties Limited | Insulated cooking vessel |
| DE102009059197A1 (en) * | 2009-12-17 | 2011-06-22 | ThyssenKrupp Steel Europe AG, 47166 | Method and device for producing a half-shell part |
| DE102013103751A1 (en) * | 2013-04-15 | 2014-10-16 | Thyssenkrupp Steel Europe Ag | Process for the production of high-volume half-shells and apparatus for producing a half-shell |
| US10603707B2 (en) * | 2015-03-31 | 2020-03-31 | Jfe Steel Corporation | Press-forming method, method of manufacturing component with the press-forming method and component manufactured with the press-forming method |
-
2021
- 2021-09-27 CN CN202111133778.6A patent/CN114011960B/en active Active
Patent Citations (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472955A (en) * | 1982-04-20 | 1984-09-25 | Amino Iron Works Co., Ltd. | Metal sheet forming process with hydraulic counterpressure |
| JPH03221218A (en) * | 1989-11-13 | 1991-09-30 | Toyo Seikan Kaisha Ltd | Re-drawing method for cup with flange |
| JPH09161736A (en) * | 1995-12-01 | 1997-06-20 | Kishimoto Akira | Battery can and manufacture thereof |
| US6929880B1 (en) * | 1999-05-07 | 2005-08-16 | Matsushita Electric Industrial Co., Ltd. | Square cell container and method of manufacturing the cell container |
| JP2001006944A (en) * | 1999-06-21 | 2001-01-12 | Aichi Electric Co Ltd | Case for oil-sealed electric appliance, method and apparatus for manufacturing the same |
| JP2002155394A (en) * | 2000-11-14 | 2002-05-31 | Toyo Kohan Co Ltd | Surface-treated steel plate for battery case, method of manufacturing surface-treated steel plate for battery case, and battery case |
| JP2002170529A (en) * | 2000-12-01 | 2002-06-14 | Hara Press Engineering:Kk | Battery case, blank for battery case and manufacturing method for the battery case |
| JP2002254115A (en) * | 2001-03-02 | 2002-09-10 | Ace Kk | Magnesium alloy made hard case and its manufacturing method |
| JP2003242936A (en) * | 2002-02-15 | 2003-08-29 | Sanyo Electric Co Ltd | Battery |
| JP2004115066A (en) * | 2002-09-26 | 2004-04-15 | Kureha Chem Ind Co Ltd | Deep drawing packaging method and slightly shrinkable film for deep drawing packaging |
| JP2004146252A (en) * | 2002-10-25 | 2004-05-20 | Sony Corp | Forming method of battery outer packaging, and forming device of battery outer packaging |
| JP2005319482A (en) * | 2004-05-10 | 2005-11-17 | Nisshin Steel Co Ltd | Manufacturing method for metallic muffler shell |
| JP2006289480A (en) * | 2005-04-14 | 2006-10-26 | Aida Eng Ltd | Press forming method and metal mold used for the same |
| JP2008095609A (en) * | 2006-10-12 | 2008-04-24 | Toyota Motor Corp | Method of manufacturing housing for fuel injection valve, and vehicular fuel injection valve manufactured by the method |
| JP2009113058A (en) * | 2007-11-02 | 2009-05-28 | Advan Eng Kk | Method of and apparatus for forming prismatic container made of austenitic stainless steel, and prismatic container |
| JP2011200932A (en) * | 2010-03-26 | 2011-10-13 | Kobe Steel Ltd | Method for manufacturing press-formed product of light metal alloy |
| CN102513451A (en) * | 2011-12-25 | 2012-06-27 | 上海工程技术大学 | Upper support frame punching process of automobile steering column and bending punching work procedure mold structure thereof |
| CN104080555A (en) * | 2012-01-12 | 2014-10-01 | 蒂森克虏伯钢铁欧洲股份公司 | Device and method for the deep drawing of shell parts with integrated head and frame trimming |
| CN104364029A (en) * | 2012-06-07 | 2015-02-18 | 东洋制罐集团控股株式会社 | Deep draw moulding method and moulding metal die therefor |
| CN103586333A (en) * | 2012-08-14 | 2014-02-19 | 冯宪平 | Sheet metal composite punching process and die |
| JP2014233755A (en) * | 2013-06-05 | 2014-12-15 | 株式会社神戸製鋼所 | Forming method of square battery case |
| RU2013129195A (en) * | 2013-06-25 | 2014-12-27 | Открытое акционерное общество "АВТОВАЗ" | METHOD FOR MULTI-OPERATION EXTRACTION OF A BOX DETAILS FROM SHEET |
| CN103752685A (en) * | 2013-10-09 | 2014-04-30 | 江苏大学 | Stamping method of multi-station efficient high-precision automobile covering part |
| CN103573465A (en) * | 2013-11-11 | 2014-02-12 | 泉州市双塔汽车零件有限公司 | Cylinder head cover and manufacturing process thereof |
| CN103801608A (en) * | 2014-02-25 | 2014-05-21 | 马鞍山市蓝华机械制造有限公司 | Small flange tubular part non-thinning drawing process |
| CN204713747U (en) * | 2014-03-31 | 2015-10-21 | 昭和电工包装株式会社 | The preservation container of micro-wave oven |
| JP2015197964A (en) * | 2014-03-31 | 2015-11-09 | 株式会社神戸製鋼所 | Method for molding square battery case |
| CN104138954A (en) * | 2014-06-25 | 2014-11-12 | 梧州恒声电子科技有限公司 | Tension fracture preventing drawing process for rectangular sheet metal parts |
| CN204638887U (en) * | 2015-04-10 | 2015-09-16 | 鹤壁职业技术学院 | A kind of mutiprogramming design composite forming die |
| WO2017145856A1 (en) * | 2016-02-22 | 2017-08-31 | 日新製鋼株式会社 | Molding material production method and molding material thereof |
| CN105522073A (en) * | 2016-02-25 | 2016-04-27 | 烟台开元模具股份有限公司 | Forming technique for small rounded corner of stainless steel automobile silencer shell flange |
| CN105964782A (en) * | 2016-06-08 | 2016-09-28 | 深圳市信维通信股份有限公司 | Shielding cover frame and manufacturing process thereof |
| WO2019008880A1 (en) * | 2017-07-06 | 2019-01-10 | Ｊｆｅスチール株式会社 | Press forming method |
| JP2019171440A (en) * | 2018-03-29 | 2019-10-10 | Ｊｆｅスチール株式会社 | Press forming method |
| JP2019212541A (en) * | 2018-06-07 | 2019-12-12 | 昭和電工パッケージング株式会社 | Deep drawing molding case for electrical storage device exterior package and the electrical storage device |
| CN109604472A (en) * | 2018-12-09 | 2019-04-12 | 中国航发南方工业有限公司 | A kind of sleeve manufacturing process |
| CN112168049A (en) * | 2019-11-01 | 2021-01-05 | 高野朗 | Cover part |
| CN110899449A (en) * | 2019-11-20 | 2020-03-24 | 河北华曙新能源汽车科技有限公司 | Deep drawing process for battery box |
| CN111266457A (en) * | 2020-01-17 | 2020-06-12 | 湖南徕木电子有限公司 | Stamping and deep-drawing preparation method of shielding case |
| KR102139805B1 (en) * | 2020-04-27 | 2020-07-31 | (주)대화정공 | Manufacturing method of automotive air suspension housing |
| CN112474984A (en) * | 2020-09-30 | 2021-03-12 | 成都飞机工业（集团）有限责任公司 | Method for deep drawing and forming sheet metal part of airplane cap-shaped fairing |
Non-Patent Citations (7)
| Title |
|---|
| 保证汽车覆盖件具有优良拉深工艺的方法;杨素华;《模具技术》(第2期);全文 * |
| 发动机罩超深冲压成形;白宇;《模具制造》;第18卷(第4期);全文 * |
| 基于变间隙压边的板料拉深成形及数字模拟研究;王晓伟;《中国优秀硕士论文全文库工程科技I辑》(第8期);全文 * |
| 张忠诚.《工程材料及成形工艺基础》.航空工业出版社,2019,(第1版),184-187. * |
| 曹立文.《新编实用冲压模具设计手册》.人民邮电出版社,2007,(第1版),253-254. * |
| 汽车加油口铰链安装盒拉伸成形工艺方案分析;曹振雨;《模具制造》;第14卷(第7期);全文 * |
| 薄板超深拉伸模设计;吕强;《模具制造》;第21卷(第2期);全文 * |
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