CN108971302B - Processing method of thin-walled piece inner flanging - Google Patents

Processing method of thin-walled piece inner flanging Download PDF

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Publication number
CN108971302B
CN108971302B CN201811068461.7A CN201811068461A CN108971302B CN 108971302 B CN108971302 B CN 108971302B CN 201811068461 A CN201811068461 A CN 201811068461A CN 108971302 B CN108971302 B CN 108971302B
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CN
China
Prior art keywords
flanging
thin
die
shaped
taken
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CN201811068461.7A
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Chinese (zh)
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CN108971302A (en
Inventor
束学道
朱颖
牛波凯
李子轩
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宁波大学
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Priority to CN201811068461.7A priority Critical patent/CN108971302B/en
Publication of CN108971302A publication Critical patent/CN108971302A/en
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Publication of CN108971302B publication Critical patent/CN108971302B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00Flanging or other edge treatment, e.g. of tubes
    • B21D19/08Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/10Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws working inwardly
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides

Abstract

The invention discloses a method for processing an inner flanging of a thin-wall part, which is characterized in that two upper dies are taken, an arc-shaped flanging female die is processed on the lower end surface of one of the upper dies, and a shaping flanging female die is processed on the lower end surface of the other upper die; then, putting a thin-wall part blank to be punched into a lower female die, putting a central core die into the thin-wall part blank, and respectively putting flanging core dies with L-shaped cross sections into two sides of the central core die; then an upper die with an arc-shaped flanging female die is arranged in the punching machine, the thin-wall part blank is subjected to first-time inner flanging punching, and arc-shaped inner flanging is punched at two sides of the thin-wall part blank; an upper die with a shaping flanging female die is arranged in a punching machine, secondary inward flanging punching is carried out on the thin-wall part blank, and the circular inward flanging at two sides of the thin-wall part is punched into a straight inward flanging to obtain a finished product; the method has the advantages that the method reduces the residual stress caused by uneven deformation, improves the forming precision of the workpiece, and is convenient to disassemble the die after the stamping is finished.

Description

Processing method of thin-walled piece inner flanging

Technical Field

The invention relates to stamping of thin-walled parts, in particular to a method for processing an inward flanging of a thin-walled part.

Background

The thin-wall part with the inner flanging mainly comprises a straight strip part and an annular part, as shown in figures 1 and 2, and the annular thin-wall part is one of important components of an engine case, so that the machining precision of the annular thin-wall part is higher. However, because the thin-walled part with the inner flanging has a complex structure and a small wall thickness, in the current processing method, the used die is complicated, the assembly and disassembly are time-consuming and labor-consuming, the forming precision is not high, and the springback is easy to generate due to the residual stress after the processing is finished.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for processing an inward flanging of a thin-wall part, which can effectively improve the forming precision, reduce the residual stress and facilitate the disassembly and assembly of a die.

The technical scheme adopted by the invention for solving the technical problems is as follows: a processing method of an inward flanging of a thin-wall part comprises the following specific steps:

(1) processing a lower female die on the lower die, taking two upper dies, processing an arc-shaped flanging female die on the lower end surface of one of the upper dies, and processing a shaping flanging female die on the lower end surface of the other upper die;

(2) placing a thin-wall part blank with a U-shaped cross section to be punched into a lower female die, then placing a central core die with a straight strip-shaped cross section into the thin-wall part blank, and respectively placing flanging core dies with L-shaped cross sections at two sides of the central core die;

(3) an upper die with an arc-shaped flanging female die is arranged in a punching machine, the upper die is driven to move downwards, first-time inner flanging punching is carried out on the thin-wall piece blank, and arc-shaped inner flanging is punched at two sides of the thin-wall piece blank;

(4) an upper die with a shaping flanging female die is arranged in a punching machine, the upper die is driven to move downwards, secondary inner flanging punching is carried out on the thin-walled piece blank, and the circular inner flanging at two sides of the thin-walled piece is punched into a straight inner flanging to obtain a finished product;

(5) and after the punching is finished, the central core die is taken out firstly, then the flanging core dies are taken out one by one from the thin-wall piece, and finally the thin-wall piece with the flat inner flanging is taken out from the lower die.

Further, when the thin-walled workpiece to be processed is in a straight strip shape, the specific operation process of the step (5) is as follows: after the punching is finished, the central core die is taken out, and then the flanging core dies are taken out one by one from the end part or the upper opening of the thin-wall part.

Further, when the thin-wall part to be processed is annular, in the step (2), an annular flanging inner core mold formed by splicing a plurality of flanging inner core mold sections with L-shaped cross sections is placed on the inner side of the central core mold, and an annular flanging outer core mold formed by splicing a plurality of flanging outer core mold sections with L-shaped cross sections is placed on the outer side of the central core mold, wherein the length of an outer circular arc of one flanging outer core mold section is smaller than that of an inner circular arc; the specific operation process of the step (5) is as follows: after punching, the central core die is taken out, then the flanging inner core die sections are taken out one by one from the upper opening of the thin-wall part, then the flanging outer core die sections with the outer arc length smaller than the inner arc length are taken out from the upper opening of the thin-wall part, and finally the rest flanging outer core die sections are taken out one by one from the upper opening of the thin-wall part.

Furthermore, the flanging section of the shaping flanging female die in the upper die is inclined downwards, the upper end surface of the flanging core die is inclined upwards and matched with the flanging section in the shaping flanging female die, so that the shaping flanging female die performs over-deformation stamping on the inner flanging of the thin-wall part blank, and after the stamping is finished, the straight inner flanging is obtained under the resilience effect of the thin-wall part.

Further, the central core mold is provided with a demolding slope.

Compared with the prior art, the method has the advantages that the method adopts the mutually independent central core die and the flanging core die in the process of stamping the inward flanging, thereby facilitating the disassembly of the die after the forming of the thin-walled part with the inward flanging and reducing the difficulty of the manufacture of the die; when the inner flanging is punched, secondary punching is adopted, the inner flanging is firstly punched into the circular-arc-shaped inner flanging, then the circular-arc-shaped inner flanging is punched into the straight-shaped inner flanging through the shaping flanging female die, the punching flanging and the shaping are separately carried out, and the shaping process is independently arranged, so that the wrinkling rate and the wall thickness thinning rate of the thin-wall part are greatly reduced, the deformation of the inner flanging is uniform, the residual stress caused by nonuniform deformation is reduced, and the forming precision of the workpiece is improved.

Drawings

FIG. 1 is a schematic structural view of a straight strip-shaped thin-walled part with an inner flange;

FIG. 2 is a schematic structural view of an annular thin-walled part with an inner flange;

FIG. 3 is a schematic view of a first inner flange punching state according to an embodiment of the present invention;

FIG. 4 is a schematic view of a second inner flange punching operation according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a shaping flanging die according to a first embodiment of the invention;

fig. 6 is a schematic structural view of a flanging core mold according to a first embodiment of the present invention;

FIG. 7 is a schematic view showing a state of the second embodiment of the present invention in the first burring pressing;

FIG. 8 is a schematic view showing a second burring pressing according to the second embodiment of the present invention;

fig. 9 is a schematic structural view of a flanged outer core mold according to a second embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows: as shown in the figure, when the thin-wall piece to be machined is in a straight strip shape, the machining method of the inward flanging comprises the following specific steps:

(1) a lower female die 11 is processed on a lower die 1, two upper dies 2-1 and 2-2 are taken, an arc-shaped flanging female die 21 is processed on the lower end surface of one upper die 2-1, a shaping flanging female die 22 is processed on the lower end surface of the other upper die 2-2, and the flanging section of the shaping flanging female die 22 is inclined downwards;

(2) putting a thin-wall part blank 3 with a U-shaped cross section to be punched into a lower female die 11, then putting a central core die 4 with a straight strip-shaped cross section into the thin-wall part blank 3, respectively putting flanging core dies 5 with L-shaped cross sections into two sides of the central core die 4, wherein the upper end surfaces of the flanging core dies 5 are inclined upwards and matched with flanging sections in a shaping flanging female die 22;

(3) an upper die 2-1 with an arc flanging female die 21 is arranged in a punching machine, the upper die 2-1 is driven to move downwards, first-time inner flanging punching is carried out on a thin-wall part blank 3, and arc-shaped inner flanging 31 is punched at two sides of the thin-wall part blank 3;

(4) an upper die 2-2 with a shaping flanging female die 22 is arranged in a punching machine, the upper die 2-2 is driven to move downwards, the thin-walled blank 3 is punched by inner flanging for the second time, the shaping flanging female die 22 is used for punching the circular inner flanging 31 of the thin-walled blank 3 by deformation, and after punching is finished, a straight inner flanging 32 is obtained under the resilience action of the thin-walled blank, so that a finished product is obtained;

(5) and after the punching is finished, the central core die 4 is taken out firstly, then the flanging core dies 5 are taken out one by one from the end part or the upper opening of the thin-wall part 3, and finally the thin-wall part 3 with the straight inward flanging 32 is taken out from the lower die 1.

Example two: as shown in the figure, when the thin-wall part to be machined is annular, the machining method of the inward flanging comprises the following specific steps:

(1) a lower female die 11 is processed on a lower die 1, two upper dies 2-1 and 2-2 are taken, an arc-shaped flanging female die 21 is processed on the lower end surface of one upper die 2-1, a shaping flanging female die 22 is processed on the lower end surface of the other upper die 2-2, and the flanging section of the shaping flanging female die 22 is inclined downwards;

(2) putting a thin-wall part blank 3 with a U-shaped cross section to be punched into a lower female die 11, then putting a central core die 4 with a straight strip-shaped cross section into the thin-wall part blank 3, putting an annular flanging inner core die formed by splicing a plurality of flanging inner core die sections 6 with L-shaped cross sections into the inner side of the central core die 4, and putting an annular flanging outer core die formed by splicing a plurality of flanging outer core die sections 7 with L-shaped cross sections into the outer side of the central core die 4, wherein the outer arc length of one section of the flanging outer core die section 7 is smaller than that of the inner arc length, and the upper end surfaces of the flanging inner core die and the flanging outer core die are upwards inclined and matched with the flanging sections in the shaping flanging female die 22;

(3) an upper die 2-1 with an arc flanging female die 21 is arranged in a punching machine, the upper die 2-1 is driven to move downwards, first-time inner flanging punching is carried out on a thin-wall part blank 3, and arc-shaped inner flanging 31 is punched at two sides of the thin-wall part blank 3;

(4) an upper die 2-2 with a shaping flanging female die 22 is arranged in a punching machine, the upper die 2-2 is driven to move downwards, the thin-walled blank 3 is punched by inner flanging for the second time, the shaping flanging female die 22 is used for punching the circular inner flanging 31 of the thin-walled blank 3 by deformation, and after punching is finished, a straight inner flanging 32 is obtained under the resilience action of the thin-walled blank, so that a finished product is obtained;

(5) after the punching is finished, the central core die 4 is taken out firstly, then the flanging inner core die sections 6 are taken out one by one from the upper opening of the thin-wall part 3, then the flanging outer core die sections 7 with the outer arc length smaller than the inner arc length are taken out from the upper opening of the thin-wall part 3, then the rest flanging outer core die sections 7 are taken out one by one from the upper opening of the thin-wall part 3, and finally the thin-wall part 3 with the straight inner flanging 32 is taken out from the lower die 1.

Claims (5)

1. A processing method of an inward flanging of a thin-wall part is characterized by comprising the following specific steps:
(1) processing a lower female die on the lower die, taking two upper dies, processing an arc-shaped flanging female die on the lower end surface of one of the upper dies, and processing a shaping flanging female die on the lower end surface of the other upper die;
(2) placing a thin-wall part blank with a U-shaped cross section to be punched into a lower female die, then placing a central core die with a straight strip-shaped cross section into the thin-wall part blank, and respectively placing flanging core dies with L-shaped cross sections at two sides of the central core die;
(3) an upper die with an arc-shaped flanging female die is arranged in a punching machine, the upper die is driven to move downwards, first-time inner flanging punching is carried out on the thin-wall piece blank, and arc-shaped inner flanging is punched on two sides of the thin-wall piece blank;
(4) an upper die with a shaping flanging female die is arranged in a punching machine, the upper die is driven to move downwards, secondary inner flanging punching is carried out on the thin-walled piece blank, and the circular inner flanging at two sides of the thin-walled piece is punched into a straight inner flanging to obtain a finished product;
(5) and after the punching is finished, the central core die is taken out firstly, then the flanging core dies are taken out one by one from the thin-wall piece, and finally the thin-wall piece with the flat inner flanging is taken out from the lower die.
2. The thin-walled workpiece inward flanging processing method according to claim 1, characterized in that: when the thin-wall piece to be processed is in a straight strip shape, the specific operation process of the step (5) is as follows: after the punching is finished, the central core die is taken out, and then the flanging core dies are taken out one by one from the end part or the upper opening of the thin-wall part.
3. The thin-walled workpiece inward flanging processing method according to claim 1, characterized in that: when the thin-wall part to be processed is annular, in the step (2), an annular flanging inner core mold formed by splicing a plurality of flanging inner core mold sections with L-shaped cross sections is placed on the inner side of a central core mold, and an annular flanging outer core mold formed by splicing a plurality of flanging outer core mold sections with L-shaped cross sections is placed on the outer side of the central core mold, wherein the length of an outer arc of one flanging outer core mold section is smaller than that of an inner arc; the specific operation process of the step (5) is as follows: after punching, the central core die is taken out, then the flanging inner core die sections are taken out one by one from the upper opening of the thin-wall part, then the flanging outer core die sections with the outer arc length smaller than the inner arc length are taken out from the upper opening of the thin-wall part, and finally the rest flanging outer core die sections are taken out one by one from the upper opening of the thin-wall part.
4. The thin-walled workpiece inward flanging processing method according to claim 1, characterized in that: the flanging section of the shaping flanging female die in the upper die is inclined downwards, the upper end surface of the flanging core die is inclined upwards and matched with the flanging section in the shaping flanging female die, so that the shaping flanging female die performs deformation stamping on the inner flanging of the thin-wall part blank, and the straight inner flanging is obtained under the resilience effect of the thin-wall part after the stamping is completed.
5. The thin-walled workpiece inward flanging processing method according to claim 1, characterized in that: the central core mould is provided with a demoulding inclination.
CN201811068461.7A 2018-09-13 2018-09-13 Processing method of thin-walled piece inner flanging CN108971302B (en)

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CN201811068461.7A CN108971302B (en) 2018-09-13 2018-09-13 Processing method of thin-walled piece inner flanging

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Application Number Priority Date Filing Date Title
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CN108971302B true CN108971302B (en) 2020-03-27

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Publication number Priority date Publication date Assignee Title
CN109570383B (en) * 2018-12-07 2020-04-21 中国航发南方工业有限公司 Equipment and method for machining annular groove on inner side of annular piece

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JP3687559B2 (en) * 2001-04-06 2005-08-24 トヨタ車体株式会社 Roll hemming device
CN102259129A (en) * 2010-05-27 2011-11-30 江苏飞月轴瓦有限公司 Flanging process for full-circle main bearing and special die thereof
CN102513444B (en) * 2011-11-30 2014-03-05 长城汽车股份有限公司 Composite flanging mechanism of stamping die
CN105215193B (en) * 2015-11-10 2017-03-22 深圳市富诚达科技有限公司 Stamping mould for processing products with different skirt flanging thicknesses and processing method
CN207238922U (en) * 2017-08-30 2018-04-17 上海众达汽车冲压件有限公司 A kind of stamping quadric flanging mould of complexity reinforcer

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