CN108500132B - Manufacturing method of flat plate progressive flanging forming tool head - Google Patents

Manufacturing method of flat plate progressive flanging forming tool head Download PDF

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CN108500132B
CN108500132B CN201810209985.7A CN201810209985A CN108500132B CN 108500132 B CN108500132 B CN 108500132B CN 201810209985 A CN201810209985 A CN 201810209985A CN 108500132 B CN108500132 B CN 108500132B
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diameter
height
flanging
flat plate
tool head
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CN108500132A (en
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张大伟
施天琳
赵升吨
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/02—Flanging or other edge treatment, e.g. of tubes by continuously-acting tools moving along the edge

Abstract

A method for manufacturing a flat plate gradual flanging forming tool head comprises the steps of firstly designing a forming tool head with a cone frustum structure form, wherein the forming tool head is a revolving body, and the lower end of the revolving body is provided with a cutter bar serving as a clamping area; a cone frustum is arranged above the cutter bar and is used as a bending deformation area; a cylinder is arranged above the cone frustum and is used as a flanging forming area; then determining the diameter of the cutter rod, determining the relevant size of the cone frustum, and finally determining the height and the diameter of the cylinder; the forming tool head can complete single-pass progressive flanging forming or multi-pass progressive flanging forming aiming at a circular or oval flat plate with a pre-opened hole.

Description

Manufacturing method of flat plate progressive flanging forming tool head
Technical Field
The invention belongs to the technical field of sheet forming, and particularly relates to a manufacturing method of a tool head for gradual flanging and forming of a flat plate.
Background
Progressive forming processes are pioneering processes developed and thoroughly studied in the past decade that can replace traditional stamping processes under non-mass production conditions. In addition to the advantages as a stepless incremental and flexible manufacturing process, experimental studies have found that the formability of progressive forming processes is generally greater than conventional stretch forming, deep drawing and stamping processes. The flanging part with the prefabricated holes is formed by using a progressive forming technology, and the flanging part has the characteristics of flexibility, low time consumption, low cost, high formability and the like.
Currently, in the research of progressive flanging forming, tool head structures used are mainly divided into two types. One is a hemispherical-ended, ball-shaped tool head, often less than 15mm in diameter. The other type is a bar-shaped tool head with a cone frustum, and reverse progressive flanging forming can be completed by using the tool head.
For the conical tool head described above, which enables reverse flanging, there is a corresponding geometrical relationship between the height of the flanging and the dimensions of the tool head. In the process of gradual flanging and forming, the structural size of the tool head directly influences the loading pass and the forming effect of the process. However, in the existing research, there is no clear design method for the structural size of the tool bit.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a manufacturing method of a flat plate progressive flanging forming tool head, which is designed to be capable of completing single-pass progressive flanging forming or multi-pass progressive flanging forming.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of a flat plate progressive flanging forming tool head comprises the following steps:
the first step is as follows: designing a forming tool head with a cone frustum structure form, wherein the forming tool head is a revolving body, and the lower end of the revolving body is a cutter bar 1 with the diameter d as a clamping area; the diameter of the lower surface above the cutter bar 1 is D1Upper surface diameter of D2Height of h1The cone frustum 2 with the cone angle theta is used as a bending deformation area; the diameter D is arranged above the truncated cone 22Height h2The cylinder 3 as a flange forming area; round corner transition is arranged between the conical surface and the lower surface of the truncated cone 2 and between the cylindrical bodies 3;
the second step is that: determining the diameter d of the cutter bar 1, wherein the value range of the diameter d is 10-20 mm;
the third step: determining the relative dimensions of the truncated cone 2: lower surface diameter D of truncated cone 21The diameter d of the cutter bar 1 is 5-8 mm larger; the included angle between the inclined plane of the truncated cone 2 and the axis of the revolving body is theta, and the value range of the theta is 20-30 degrees; height h of truncated cone 21Thickness t of the flat plate 4, pre-opening size and inner diameter d of the flanging branch pipemOutside diameter d of flanged branch pipetThe limit flanging height is H related to the flanging height H, and in the gradual flanging forming process of the flat plate 4, the limit flanging height of single-pass gradual forming is Hmax；
A. When the height H of the flanging is less than or equal to HmaxThen, single-pass progressive flanging forming is adopted; during the forming process, the maximum length of the bending deformation of the flat plate 4 is l ═ h1 min×tanθ；
When the pre-opening of the plate 4 is of diameter d0When the circular pre-desired hole is formed, the volume of the flat plate deformed before flanging is as follows
Figure GDA0002355272060000021
The volume of the flat plate which deforms after being turned over is as follows
Figure GDA0002355272060000022
According to the principle of constant volume, the volume of the turned-over edge is equal before and after the turned-over edge, i.e. V0＝V1The height h of the truncated cone 2 is determined by1Minimum value h of1 min：
Figure GDA0002355272060000023
Thus, the height h of the tool head frustum 2 is designed1Should be greater than or equal to the minimum value calculated, i.e. h1≥h1 min；
When the pre-opening of the flat plate 4 is an elliptical pre-opening with the major axis dimension a and the minor axis dimension b, the volume of the flat plate deformed before flanging is equal to
Figure GDA0002355272060000024
The volume of the flat plate which deforms after being turned over is as follows
Figure GDA0002355272060000031
According to the principle of constant volume, the volume of the turned-over edge is equal before and after the turned-over edge, i.e. V0＝V1The height h of the truncated cone 2 is determined by1Minimum value h of1 min：
Figure GDA0002355272060000032
Thus, the height h of the tool head frustum 2 is designed1Should be greater than or equal to the minimum value calculated, i.e. h1≥h1 min；
B. When the height H of the flange is more than HmaxThen, multi-pass progressive flanging forming is adopted; in the multi-pass progressive flanging forming process, a distance delta l needs to be transversely fed between each forming pass, the maximum transverse feeding quantity delta l is determined according to the requirement, and the transverse feeding quantity delta l is in a value condition that t is less than or equal to delta l and less than or equal to h1X tan theta, thereby obtaining the height h of the tool head truncated cone 21Has a minimum value of
Figure GDA0002355272060000033
Therefore, during the multi-pass flat plate progressive flanging forming process, a designer worksHeight h of truncated cone 21Should be greater than or equal to the minimum value calculated, i.e.
Figure GDA0002355272060000034
From the lower surface diameter D of the truncated cone 21Taper angle theta and height h1Is determined by the value of (D)2Upper surface diameter D2Is taken as D2＝D1+2h1×tan θ；
The fourth step: determining the height h of the cylinder 32And diameter D2(ii) a Height h of cylinder 32The value range of (1) is 10-30 mm; diameter D of cylinder 32Diameter D of the upper surface of the truncated cone 22Of uniform size, i.e. diameter D of cylinder 32Is taken as D2＝D1+2h1×tan θ。
The invention has the beneficial effects that a simple and feasible design method of the tool head for forming the flat plate gradual flanging is provided; the tool head designed by the method is simple in structure and easy to produce and process; the method defines the geometric relationship and the value range of the sizes of all the areas of the tool head, is beneficial to shortening the design time and has the advantages of time saving and high efficiency; the method is suitable for the flat plate with the circular pre-opening hole and the elliptical pre-opening hole and the gradual flanging forming of single pass and multiple passes, and has wide application range.
Drawings
Fig. 1 is a schematic view of a tool head structure with a truncated cone structure according to the present invention.
FIG. 2 is a schematic view of single-pass progressive flanging and forming of a circular flat plate to be perforated.
FIG. 3 is a schematic view of single-pass progressive flanging forming of an oval flat plate to be perforated.
FIG. 4 is a schematic view of a multi-pass progressive flanging forming process of a flat plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
A manufacturing method of a flat plate progressive flanging forming tool head comprises the following steps:
the first step is as follows: referring to fig. 1, a forming tool head with a cone frustum structure is designed, the forming tool head is a revolving body, the lower end of the revolving body is a cutter bar 1 with the diameter d, the cutter bar is used as a clamping area and is connected with a cutter handle and installed on a gradual flexible flanging device of a large-caliber thick-wall cylinder; the diameter of the lower surface above the cutter bar 1 is D1Upper surface diameter of D2Height of h1A truncated cone 2 with a cone angle theta as a bending deformation area for bending deformation of the flat plate 4; the diameter D is arranged above the truncated cone 22Height h2The cylinder 3 is used as a flanging forming area and is used for completing flanging forming of the bent and deformed plate; round corner transition is arranged between the conical surface and the lower surface of the truncated cone 2 and between the cylindrical bodies 3;
the second step is that: with reference to fig. 1, the diameter d of the tool holder 1 is determined: in order to ensure that the tool head has certain rigidity in the forming process, the diameter d of the cutter bar 1 cannot be too small, and the value range of the diameter d is 10-20 mm;
the third step: with reference to fig. 1, the relative dimensions of the truncated cone 2 are determined: lower surface diameter D of truncated cone 21The diameter d of the cutter bar 1 is 5-8 mm larger; the included angle between the inclined plane of the truncated cone 2 and the axis of the revolving body is theta, and the value range of the theta is 20-30 degrees; height h of truncated cone 21Thickness t of the flat plate 4, pre-opening size and inner diameter d of the flanging branch pipemOutside diameter d of flanged branch pipetRelated to the flanging height H, in the process of the gradual flanging and forming of the flat plate, the limit flanging height of the single-pass gradual forming is Hmax；
A. Referring to FIG. 2, when the height H of the flange is not more than HmaxThen, single-pass progressive flanging forming is adopted; during the forming process, the maximum length of the bending deformation of the flat plate 4 is l ═ h1 min×tan θ；
Referring to FIG. 2, when the pre-opening of the plate 4 is of diameter d0When the circular pre-hole is opened, the size of the shadow part of the flat plate which is deformed before the flanging is as follows
Figure GDA0002355272060000051
The volume of the shadow part of the flat plate which deforms after being turned over is as follows
Figure GDA0002355272060000052
According to the principle of constant volume, the volume of the turned-over edge is equal before and after the turned-over edge, i.e. V0＝V1The height h of the truncated cone 2 is determined by1Minimum value h of1 min：
Figure GDA0002355272060000053
Thus, the height h of the tool head frustum 2 is designed1Should be greater than or equal to the minimum value calculated, i.e. h1≥h1 min；
Referring to FIG. 3, when the pre-opening of the flat plate 4 is an elliptical pre-opening with a major axis dimension a and a minor axis dimension b, the volume of the shadow part of the flat plate deformed before flanging is equal to
Figure GDA0002355272060000054
The volume of the shadow part of the flat plate which deforms after being turned over is as follows
Figure GDA0002355272060000055
According to the principle of constant volume, the volume of the turned-over edge is equal before and after the turned-over edge, i.e. V0＝V1The height h of the truncated cone 2 is determined by1Minimum value h of1 min：
Figure GDA0002355272060000056
Thus, the height h of the tool head frustum 2 is designed1Should be greater than or equal to the minimum value calculated, i.e. h1≥h1 min；
B. Referring to FIG. 4, when the flange height H > HmaxThen, multi-pass progressive flanging forming is adopted; in the multi-pass progressive flanging forming process, a distance delta l needs to be transversely fed between each forming pass, the maximum transverse feeding quantity delta l is determined according to the requirement, and the transverse feeding quantity delta l is in a value condition that t is less than or equal to delta l and less than or equal to h1X tan theta, thereby obtaining the height h of the tool head truncated cone 21Has a minimum value of
Figure GDA0002355272060000057
Therefore, in the multi-pass flat plate progressive flanging forming process, the height h of the tool head conical table 2 is designed1Should be greater than or equal to the minimum value calculated, i.e.
Figure GDA0002355272060000058
From the lower surface diameter D of the truncated cone 21Taper angle theta and height h1Is determined by the value of (D)2Upper surface diameter D2Is taken as D2＝D1+2h1×tan θ；
The fourth step: referring to fig. 1, the height h of the cylinder 3 is determined2And diameter D2(ii) a Height h of cylinder 32The value range of (1) is 10-30 mm; diameter D of cylinder 32Diameter D of the upper surface of the truncated cone 22Of uniform size, i.e. diameter D of cylinder 32Is taken as D2＝D1+2h1×tan θ。

Claims (1)

1. A manufacturing method of a flat plate progressive flanging forming tool head is characterized by comprising the following steps:
the first step is as follows: designing a forming tool head with a cone frustum structure form, wherein the forming tool head is a revolving body, and the lower end of the revolving body is a cutter bar (1) with the diameter of d and used as a clamping area; the diameter of the lower surface above the cutter bar (1) is D1Upper surface diameter of D2Height of h1The included angle between the inclined plane of the truncated cone (2) and the axis of the revolving body is theta, and the included angle is used as a bending deformation area; the diameter D is arranged above the truncated cone (2)2Height h2The cylinder (3) as a flanging-forming zone; round corner transition is arranged between the conical surface and the lower surface of the truncated cone (2) and between the cylindrical body (3);
the second step is that: determining the diameter d of the cutter bar (1), wherein the value range of the diameter d is 10-20 mm;
the third step: determining the relative size of the truncated cone (2): the diameter D of the lower surface of the truncated cone (2)1Is 5-8 mm larger than the diameter d of the cutter bar (1); the inclined plane of the truncated cone (2) is arranged with the axis of the revolving bodyThe included angle is theta, and the value range of theta is 20-30 degrees; height h of the truncated cone (2)1The thickness t of the flat plate (4), the size of the pre-opening hole and the inner diameter d of the flanging branch pipemOutside diameter d of flanged branch pipetRelated to the height H of the flange; in the progressive flanging forming process of the flat plate, the limit flanging height of single-pass progressive forming is Hmax；
A. When the height H of the flanging is less than or equal to HmaxThen, single-pass progressive flanging forming is adopted; during the forming process, the maximum length of the bending deformation of the flat plate (4) is l ═ h1min×tanθ；
The pre-opening of the plate (4) has a diameter d0The volume of the flat plate which is deformed before flanging is as follows
Figure FDA0002355272050000011
The volume of the flat plate which deforms after being turned over is as follows
Figure FDA0002355272050000012
According to the principle of constant volume, the volume of the turned-over edge is equal before and after the turned-over edge, i.e. V0＝V1The height h of the truncated cone (2) is determined by1Minimum value h of1min：
Figure FDA0002355272050000013
Therefore, the height h of the tool head cone (2) is designed1Should be greater than or equal to the minimum value calculated, i.e. h1≥h1min；
B. When the height H of the flange is more than HmaxThen, multi-pass progressive flanging forming is adopted; in the multi-pass progressive flanging forming process, a distance delta l needs to be transversely fed between each forming pass, the maximum transverse feeding quantity delta l is determined according to the requirement, and the transverse feeding quantity delta l is in a value condition that t is less than or equal to delta l and less than or equal to h1X tan theta, thereby obtaining the height h of the tool head truncated cone (2)1Has a minimum value of
Figure FDA0002355272050000021
Therefore, in the process of multi-pass flat plate progressive flanging formingDesigning the height h of the tool head cone (2)1Should be greater than or equal to the minimum value calculated, i.e.
Figure FDA0002355272050000022
The diameter D of the lower surface of the truncated cone (2)1Taper angle theta and height h1Is determined by the value of (D)2Upper surface diameter D2Is taken as D2＝D1+2h1×tanθ；
The fourth step: determining the height h of the cylinder (3)2And diameter D2(ii) a Height h of the cylinder (3)2The value range of (1) is 10-30 mm; diameter D of the cylinder (3)2The diameter D of the upper surface of the truncated cone (2)2Of uniform size, i.e. diameter D of cylinder (3)2Is taken as D2＝D1+2h1×tanθ。
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Publication number Priority date Publication date Assignee Title
CN111496077B (en) * 2020-04-27 2022-02-22 东南大学 Square hole flanging forming method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693568A (en) * 1971-03-29 1972-09-26 Francis G Mckee Method of forming heat exchanger fin collars
CN103521607A (en) * 2013-10-15 2014-01-22 重庆大学 Numerical-control progressive tube wall hole flanging and forming tool head and method
CN104259308A (en) * 2014-09-24 2015-01-07 重庆大学 Tool head and method for pipe end mould-free numerical control incremental turn-up forming
CN104368662A (en) * 2014-11-14 2015-02-25 重庆大学 Tool head and method for controlling buckling deformation in thin plate die-free gradual edge turning process
CN104816166A (en) * 2015-04-10 2015-08-05 上海交通大学 Pore opening and pore broadening integrated incremental forming hole flanging tool and hole flanging process
CN204564869U (en) * 2015-05-07 2015-08-19 四川太湖锅炉有限公司 A kind of hemmer of large-diameter circular thin plate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693568A (en) * 1971-03-29 1972-09-26 Francis G Mckee Method of forming heat exchanger fin collars
CN103521607A (en) * 2013-10-15 2014-01-22 重庆大学 Numerical-control progressive tube wall hole flanging and forming tool head and method
CN104259308A (en) * 2014-09-24 2015-01-07 重庆大学 Tool head and method for pipe end mould-free numerical control incremental turn-up forming
CN104368662A (en) * 2014-11-14 2015-02-25 重庆大学 Tool head and method for controlling buckling deformation in thin plate die-free gradual edge turning process
CN104816166A (en) * 2015-04-10 2015-08-05 上海交通大学 Pore opening and pore broadening integrated incremental forming hole flanging tool and hole flanging process
CN204564869U (en) * 2015-05-07 2015-08-19 四川太湖锅炉有限公司 A kind of hemmer of large-diameter circular thin plate

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