CN111715828A - Stamping forging forming process for side wall peripheral inverted step - Google Patents
Stamping forging forming process for side wall peripheral inverted step Download PDFInfo
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- CN111715828A CN111715828A CN202010498640.5A CN202010498640A CN111715828A CN 111715828 A CN111715828 A CN 111715828A CN 202010498640 A CN202010498640 A CN 202010498640A CN 111715828 A CN111715828 A CN 111715828A
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- forming
- forging
- side wall
- die
- inverted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
Abstract
The invention discloses a side wall peripheral inverted step impact forging forming process, which comprises the following steps: (1) forming the four right-angle side walls: bending the plate by 90 degrees to form a first prefabricated part; (2) and (3) forming by reversely buckling all around at an angle of 45 degrees: reversing the periphery of the first prefabricated part by 45 degrees to obtain a second prefabricated part; (3) and (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing the second pre-processed part on a back-off 90-degree forming die, and forming a front necking, and obtaining a third pre-processed part after reversing the periphery of the second pre-processed part by 90 degrees; (4) and (3) stamping and forging the peripheral reversed plane steps: and fixing the third pre-processed part on a front forging and pressing forming die for front forging and forming, and obtaining a finished product with the peripheral inverted step structure after forming. In the forming process, the straight edges of the side walls are subjected to forming stress for multiple times, so that the uniformity of the appearance fillet of the product can be well ensured, a finished product with a peripheral inverted step structure can be obtained without adopting two or more pieces of equipment, and the appearance integrity and the attractiveness of the product are ensured.
Description
Technical Field
The invention belongs to the technical field of notebook computer shell processing, and particularly relates to a stamping and forging forming process for reverse-buckled steps on the periphery of a side wall.
Background
In recent years, the casings of mobile phones and notebook computers are always required to be light, thin, attractive and compact, and appearance steps of the casings of traditional mobile phones and notebook computers need to be assembled into steps in a two-piece butt joint mode. However, the two-piece assembly requires enough space for arranging the two-piece structure, and cannot meet the requirement of the light and thin structure of the product, so that the weight of the whole product is greatly improved; in addition, the butt-joint assembly product has seams, which also affects the appearance of the whole product.
Disclosure of Invention
The invention provides a stamping and forging forming process for reversely buckled steps on the periphery of a side wall, and aims to solve the technical problems that the weight of the whole product is increased and seams exist due to the fact that the appearance steps of a mobile phone or a notebook computer shell are assembled in a butt joint mode.
In order to achieve the purpose, the invention provides the following technical scheme:
a side wall periphery inverted step impact forging forming process comprises the following steps:
(1) forming the four right-angle side walls: fixing the plate on a 90-degree forming die, bending and forming, and bending the plate by 90 degrees to obtain a first prefabricated part;
(2) and (3) forming by reversely buckling all around at an angle of 45 degrees: fixing the first pre-processed part on an inverted 45-degree angle forming die, and carrying out front necking forming, and after reversing the 45-degree angle around the first pre-processed part, obtaining a second pre-processed part;
(3) and (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing the second pre-processed part on a back-off 90-degree forming die, and forming a front necking, and obtaining a third pre-processed part after reversing the periphery of the second pre-processed part by 90 degrees;
(4) and (3) stamping and forging the peripheral reversed plane steps: and fixing the third pre-processed part on a front forging and pressing forming die for front forging and forming, and obtaining a finished product with the peripheral inverted step structure after forming.
Preferably, the plate is made of Al5052 alloy aluminum, and the hardness of the plate is HV 60-70.
Preferably, in the step (2), the forming root of the prefabricated part is reversely buckled at an angle of 45 degrees on the periphery of the prefabricated part, and a local convex structure is arranged on the forming root, so that excessive material flow is prevented when the prefabricated part retracts at an angle of 45 degrees.
Preferably, in the step (2), the size of the gap between the first forming male die and the first forming female die of the 45-degree angle forming die is 95% of the thickness of the side wall of the first preprocessed part, so that the side wall is prevented from being dented due to the action of external force.
Preferably, in the step (2), the gap between the first forming punch and the first forming die at the corner of the 45-degree angle of the first prefabricated part is 1.2T of side wall thickness, so that when the corner is shrunk, the material flows to the middle, and when the yield strength of the material is higher, the material is wrinkled.
Preferably, in the step (3), a material blocking gap is set on the second forming punch of the 90-degree reversing forming die, so that the outer circle of the corner of the second pre-machined part is prevented from being too large when the second pre-machined part is formed by reversing 90 degrees.
Preferably, in the step (4), the surface of the inner cavity of the forming female die III of the front forging and pressing forming die is required to be 0.4-0.8 smooth and the surface of the inner cavity is subjected to titanizing treatment.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a step-by-step forming method, wherein the step-by-step forming method comprises the steps of firstly stretching and forming at 90 degrees, then sequentially forming by reversing at 45 degrees and reversing at 90 degrees, finally, performing front-side impact forging and forming to complete the processing of the peripheral reversed step structure, and obtaining the side wall step offset structure after forming; in the forming process, the straight edges of the side walls are subjected to forming stress for multiple times, so that the uniformity of the appearance fillet of the product can be well ensured, a finished product with a peripheral inverted step structure is obtained without adopting two or more pieces of equipment, the appearance integrity and the attractiveness of the product are ensured, and meanwhile, the problems that the weight of the whole product is increased and seams exist due to the fact that the appearance steps of the shell of a mobile phone or a notebook computer are assembled in a butt joint mode in a traditional mode are solved.
Drawings
FIG. 1 is a schematic view of a first pre-processed part according to the present invention;
FIG. 2 is a schematic view of the structure of a second preform in the present invention;
FIG. 3 is a schematic view of the structure of a third preform in the present invention;
FIG. 4 is a schematic structural diagram of a finished product with a four-side inverted step structure according to the present invention;
FIG. 5 is a schematic view of the formation of the peripheral right-angled sidewall of the present invention;
FIG. 6 is a schematic structural view of a gradual change fillet forming mold according to the present invention;
FIG. 7 is a schematic view of the present invention illustrating the formation of a 45 degree undercut around the periphery;
FIG. 8 is a schematic structural view of a first forming punch of the invention;
FIG. 9 is a schematic view of the present invention showing a 90 degree press forging process with four undercut portions;
FIG. 10 is a schematic view of the present invention illustrating the four-sided reverse-buckled flat step press forging;
reference numerals: 1. the device comprises an upper template, 2, a pressure plate, 3, a lower template, 4, a gradual change type fillet forming die, 11, a first male die slide elastic element, 12, a first forming female die, 13, a first male die nitrogen spring ejector rod, 14, a first forming male die, 21, a second male die slide elastic element, 22, a second forming female die, 23, a second male die nitrogen spring ejector rod, 24, a second forming male die, 31, a third male die slide elastic element, 32, a forging punch, 33, a third forming female die, 34, a third male die nitrogen spring ejector rod, 35 and a third forming male die.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples, but the scope of protection is not limited thereto.
The first embodiment is as follows:
a side wall periphery inverted step impact forging forming process comprises the following steps:
(1) forming the four right-angle side walls: fixing the plate on a 90-degree forming die, bending and forming, and bending the plate by 90 degrees to obtain a first preprocessed part shown in the figure 1;
(2) and (3) forming by reversely buckling all around at an angle of 45 degrees: fixing the first preprocessed part on a back-off 45-degree angle forming die, and performing front necking forming, and after the periphery of the first preprocessed part is back-off by 45-degree angle, obtaining a second preprocessed part shown in the figure 2;
(3) and (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing the second pre-processed part on a reversing 90-degree forming die, and performing front necking forming, and reversing 90-degree angles around the second pre-processed part to obtain a third pre-processed part shown in the figure 3;
(4) and (3) stamping and forging the peripheral reversed plane steps: and fixing the pre-processed part III on a front forging forming die for front forging forming, and obtaining a finished product with the peripheral inverted step structure shown in figure 4 after forming.
Example two:
a side wall periphery inverted step impact forging forming process comprises the following steps:
(1) forming the four right-angle side walls: fixing a plate on a 90-degree forming die, bending and forming, and bending the plate by 90 degrees to obtain a first preprocessed part shown in figure 1, wherein the plate is made of Al5052 alloy aluminum and has the hardness of HV 60-70;
(2) and (3) forming by reversely buckling all around at an angle of 45 degrees: fixing the first pre-processed part on an inverted 45-degree angle forming die, and carrying out front necking forming, and after reversing 45-degree angles around the first pre-processed part, obtaining a second pre-processed part shown in fig. 2, wherein a local bulge structure is arranged at the root of the inverted 45-degree angle forming on the periphery of the first pre-processed part, so that the excessive material flow when the first pre-processed part is retracted by 45-degree angles is prevented; the size of the gap between the first forming convex die 14 and the first forming concave die 12 of the 45-degree angle forming die is 95% of the thickness of the side wall of the pre-processed part, and the side wall is prevented from being dented by external force.
(3) And (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing the second pre-processed part on a reversing 90-degree forming die, and performing front necking forming, and reversing 90-degree angles around the second pre-processed part to obtain a third pre-processed part shown in the figure 3;
(4) and (3) stamping and forging the peripheral reversed plane steps: and fixing the pre-processed part III on a front forging forming die for front forging forming, and obtaining a finished product with the peripheral inverted step structure shown in figure 4 after forming.
Example three:
a side wall periphery inverted step impact forging forming process comprises the following steps:
(1) forming the four right-angle side walls: fixing a plate on a 90-degree forming die, bending and forming, and bending the plate by 90 degrees to obtain a first preprocessed part shown in figure 1, wherein the plate is made of Al5052 alloy aluminum and has the hardness of HV 60-70;
(2) and (3) forming by reversely buckling all around at an angle of 45 degrees: fixing the first pre-processed part on an inverted 45-degree angle forming die, and carrying out front necking forming, and after reversing 45-degree angles around the first pre-processed part, obtaining a second pre-processed part shown in fig. 2, wherein a local bulge structure is arranged at the root of the inverted 45-degree angle forming on the periphery of the first pre-processed part, so that the excessive material flow when the first pre-processed part is retracted by 45-degree angles is prevented; the size of a gap between a first forming convex die 14 and a first forming concave die 12 of the 45-degree angle forming die is 95% of the thickness of a side wall of a pre-processed part, and side wall dents caused by external force on the side wall are avoided;
the size of a gap between a first forming male die 14 and a first forming female die 13 which are reversely buckled at a 45-degree corner on a first prefabricated part is 1.2T side wall thickness, so that when the corner is in necking, materials flow towards the middle, and when the yield strength of the materials is higher than the yield strength of the materials, the materials are wrinkled.
(3) And (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing a second pre-processed part on a 90-degree reverse-buckling forming die, and performing front necking forming, and performing reverse buckling on the periphery of the second pre-processed part by 90 degrees to obtain a third pre-processed part shown in the figure 3, wherein a material blocking gap is set on a second forming punch 24 of the 90-degree reverse-buckling forming die so as to avoid overlarge outer circle of a corner of the second pre-processed part during the 90-degree reverse-buckling forming;
(4) and (3) stamping and forging the peripheral reversed plane steps: fixing the pre-processed part III on a front forging forming die for front forging forming, and obtaining a finished product with a peripheral reversed step structure shown in figure 4 after forming; wherein, the surface of the inner cavity of the forming female die III 33 of the front forging and pressing forming die needs to reach 0.4-0.8, and the surface of the inner cavity is subjected to titanizing treatment.
The punching forging forming process for the reversed steps around the side wall in the embodiment comprises the following specific operation steps:
the method comprises the following steps: referring to fig. 5, a schematic view of forming a peripheral right-angled side wall is shown, when a plate is bent and formed, a pressure plate 2 is arranged on the front side to press the plate, the plate is bent and formed by 90 degrees on an upper template 1, no pressure is arranged around a lower template 3, a corner fillet formed by bending the plate is small, so that cracking or wrinkling deformation of the corner due to multiple materials is avoided, a gradual change type fillet forming die 4 shown in fig. 6 is used for gradual change type fillet forming processing, and a first preprocessed part shown in fig. 1 is obtained after forming.
Step two: referring to fig. 7, a schematic view of forming a 45-degree angle with inverted periphery is shown, a forming male die 14 is formed by assembling sliding blocks, the assembly is shown in fig. 8, the forming male die 14 is formed by combining 8 block type sliding blocks, the forming is performed sequentially during working, the upper portion of each sliding block is pressed against different sliding block single pieces by a male die sliding block elastic element I11 during stripping, during working, the forming male die 14 integrally presses the front face and the peripheral side wall face of a first pre-machined part by using a male die nitrogen spring ejector rod I13, the forming female die 12 continues to be pressed downwards after the forming is in place, and an inner cavity of the forming female die I12 is inverted to form a 45-degree inclined face, so that a second pre-machined part shown in fig.
Step three: referring to fig. 9, the schematic drawing of the peripheral reverse 90-degree press forging forming is shown, a second forming male die 24 is formed by assembling and splicing slide blocks, the upper portion of each slide block is pressed against different slide block single pieces by a second male die slide block elastic element 21 during stripping, during work, the second forming male die 24 integrally presses the front surface and the peripheral side wall surface of a second pre-processed part by using a second male die nitrogen spring ejector rod 23, the second forming female die 22 continues to be pressed downwards after the second forming male die is in place, and a 90-degree inclined surface is reversed by using an inner cavity of the second forming female die 22, so that a third pre-processed part shown.
Step four: referring to fig. 10, a schematic drawing of the press forging forming of the peripheral reversed-buckled plane step is shown, a forming male die three 35 is formed by assembling and splicing slide blocks, the upper part of each slide block is pressed against different slide block single pieces by a male die slide block elastic element three 31 during stripping, the forming male die three 35 integrally presses the front surface and the peripheral side wall surface of a pre-processed part two by a male die nitrogen spring ejector rod two 34 during working, after the forming male die three 35 is in place during working, the side wall and the front surface of the forming male die three press the pre-processed part three, and the forming male die three 33 and the forming female die three 33 press down simultaneously during continuous working, and the front surface step of the pre-processed part three is forged and pressed by the step difference of a forging.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. The stamping forging forming process for the reversed steps around the side wall is characterized by comprising the following steps of:
(1) forming the four right-angle side walls: fixing the plate on a 90-degree forming die, bending and forming, and bending the plate by 90 degrees to obtain a first prefabricated part;
(2) and (3) forming by reversely buckling all around at an angle of 45 degrees: fixing the first pre-processed part on an inverted 45-degree angle forming die, and carrying out front necking forming, and after reversing the 45-degree angle around the first pre-processed part, obtaining a second pre-processed part;
(3) and (3) performing reverse buckling at 90 degrees all around to perform stamping and forming: fixing the second pre-processed part on a back-off 90-degree forming die, and forming a front necking, and obtaining a third pre-processed part after reversing the periphery of the second pre-processed part by 90 degrees;
(4) and (3) stamping and forging the peripheral reversed plane steps: and fixing the third pre-processed part on a front forging and pressing forming die for front forging and forming, and obtaining a finished product with the peripheral inverted step structure after forming.
2. The stamping and forging forming process for the inverted steps on the periphery of the side wall as claimed in claim 1, wherein the plate is made of Al5052 alloy aluminum, and the hardness of the plate is HV 60-70.
3. The press forging forming process for the undercut step of the sidewall of claim 1, wherein in step (2), the root of the undercut 45 degree angle formed on the first side of the prefabricated part is provided with a local protrusion to prevent excessive material flow when the first side of the prefabricated part is retracted 45 degree angle.
4. The stamping forging forming process for the inverted steps around the side wall as claimed in claim 1, wherein in the step (2), the size of the gap between the first forming male die and the first forming female die of the inverted 45-degree angle forming die is 95% of the thickness of the side wall of the pre-processed part, so that the side wall is prevented from being indented due to external force.
5. The press forging forming process for the inverted step around the side wall as claimed in claim 1, wherein in the step (2), the size of the gap between the first forming punch and the first forming die at the inverted 45-degree corner on the first prefabricated part is 1.2T of side wall thickness, so as to avoid the material from flowing to the middle when the corner is shrunk and causing the wrinkling of the material when the yield strength of the material is higher.
6. The side wall peripheral inverted step press forging forming process according to claim 5, wherein in the step (3), a material blocking gap is set on a forming male die II of the inverted 90-degree forming die so as to avoid overlarge outer circle of a corner of the pre-processed piece II during inverted 90-degree forming.
7. The press forging forming process for the inverted steps around the side wall as claimed in claim 6, wherein in the step (4), the surface of the inner cavity of the forming die III of the front forging forming die is required to have a finish degree of 0.4-0.8 and the surface of the inner cavity is subjected to titanizing treatment.
8. The stamping forging forming process for the inverted steps on the periphery of the side wall, according to claim 6, wherein the thickness of the plate is 0.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010498640.5A CN111715828A (en) | 2020-06-04 | 2020-06-04 | Stamping forging forming process for side wall peripheral inverted step |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010498640.5A CN111715828A (en) | 2020-06-04 | 2020-06-04 | Stamping forging forming process for side wall peripheral inverted step |
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Application publication date: 20200929 |