CN106734419B - A kind of elbow member bulging prevents the corrugated method of interior angle - Google Patents
A kind of elbow member bulging prevents the corrugated method of interior angle Download PDFInfo
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- CN106734419B CN106734419B CN201510821722.8A CN201510821722A CN106734419B CN 106734419 B CN106734419 B CN 106734419B CN 201510821722 A CN201510821722 A CN 201510821722A CN 106734419 B CN106734419 B CN 106734419B
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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
- B21D7/00—Bending rods, profiles, or tubes
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A kind of elbow member bulging prevents the corrugated method of interior angle, and step includes：By round pipe, the length according to required for formation of parts is cut；It bent according to the selection of the practical structures feature of part, push away curved, roll bending or bending machine bending；In the mold that the cross sectional shape that the bend pipe of acquisition is placed in mold cavity has been changed, the cross sectional shape of mold cavity is flat annular, and distance of the medial surface of elbow curvature part apart from mold cavity inner sidewall is less than distance of the lateral surface of elbow curvature part apart from mold cavity opposite side inner sidewall；Then progress is hydraulic for the first time, realizes and first limits the expansion of elbow curvature portion outboard and inside is allowed first to expand mold；Molding two：Molding pipe fitting for the first time is put into final circular mold cavity, hydro-forming qualified products.It is less prone to corrugation with interior angle, expands the advantages of position does not rupture, is able to achieve even inflation.
Description
Technical field
The present invention relates to bending pipe fitting Bulging Technology fields, and in particular to a kind of elbow member bulging prevents the corrugated side of interior angle
Method.
Background technique
With industrial development, bending pipe fitting using more and more, such as the swan-neck in being applied to automobile engine etc.
Part, bending pipe fitting are mainly made of the different pipeline of bore, and general both ends are small-bore, the intermediate heavy caliber for expansion；It is made
Make process to be generally first bent straight tube, bulging processing then is carried out to crooked position.But due to bending pipe fitting because curved
Guan Hou, the tube wall of bending part in the outer part are thinned since extension area is big, and the tube wall of the inside of close bending part due to
It is subjected to compressive forces and thickness increase (alternatively referred to as interior angle thickness increases)；As shown in Figure 1, for a now traditional not good liquor
The cross-sectional view of molded mold cavity and bend pipe, wherein bend pipe 1,In mold cavity 2,It is interior, it then carries out again curved
The bulging operation of bent portions realizes that the tube wall of bending part expands, such as when carrying out hydro-forming to bending part, pipe
In the case that part expansion rate is big, it is easy to inside due to the differentiation of tube wall thickness, on the outside of bending part and first forms, outside
It first realizes expansion, then necessarily pulls the inside of pipe fitting bending part to shrink, thus easily lead to the inside of bending part i.e.
Interior angle will form the dead wrinkle that can not be eliminated.And the wall unevenness that will cause dilation after generation of extremely wrinkling is even, causes uneven swollen
It is swollen, so that expansion position is easy to happen fracture phenomena；Or even if there is not fracture phenomena in expansion process, but using
Cracked, leakage phenomenon generation is easily caused in the process, to cause great security risk.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of the prior art, provides a kind of interior angle and is less prone to corrugation, expands position and does not rupture,
The elbow member bulging for being able to achieve even inflation prevents the corrugated method of interior angle.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of elbow member bulging prevents interior angle from rising
The method of wrinkle, step include：
(1) blanking：By round pipe, the length according to required for formation of parts is cut；
(2) bend pipe：Bent according to the selection of the practical structures feature of part, push away curved, roll bending or bending machine be bent to obtain it is curved
Pipe, the ratio between the bending radius (i.e. the radius of the bending circular arc of bend pipe central axis) of bend pipe and the caliber (radius) of bend pipe are
1.3-1.6；
(3) one is formed：The type that the bend pipe that step (2) obtain is placed in first time molding die is intracavitary；The first time
Molding die includes upper die and lower die；Recess forms the groove for placing bend pipe on the surface of lower die；The groove is close to curved
Outer profile after the shape of the inside of pipe bending part is expanded with final elbow member is identical, and groove is close to the outer of elbow curvature part
Outer profile after the shape of side and the expansion of final elbow member is inwardly indented 5-8mm；The groove size phase of upper die and lower die after molding
Together, and after molding the perimeter of the longitudinal cross-section of the closed-loop type chamber constituted and the week of the longitudinal cross-section after the expansion of final elbow member
Length is equal；Then the mold upper and lower mould molding after placement bend pipe is subjected to hydro-forming, first limits the outside of elbow curvature part
Expansion and allow the inside of bending part first to expand mold, obtain the thick part of bend pipe；
(4) two are formed：The second mold cavity after the thick part of pipe fitting after molding for the first time to be put into final bend pipe expansion
It is interior；Second mold includes upper die and lower die；Recess is formed for placing bend pipe, profile and final on the surface of lower die
The groove that outer profile after bend pipe expansion fits；The groove size of upper die and lower die is identical after molding；Then bend pipe will be placed
Mold upper and lower mould molding afterwards carries out hydro-forming, obtains final bend pipe expansion piece, the elbow curvature half of final bend pipe expansion piece
The ratio between caliber (radius) of diameter and bend pipe is less than 1.2；
Hydro-forming described in step (3) of the present invention is divided into four stage hydro-forming, and the first stage controls on the inside of bend pipe (i.e.
Into the liquid inside bend pipe for expanding bend pipe) hydraulic briquetting pressure rises to 20MPa, time 1.5-2.5s by 0；The
Hydraulic briquetting pressure rises to 35MPa, time 1.5-2.5s by 20MPa on the inside of two-stage control bend pipe；Phase III control
Hydraulic briquetting pressure rises to 50MPa, time 1.5-2.5s by 35MPa on the inside of bend pipe；Fourth stage controls liquid on the inside of bend pipe
The briquetting pressure of pressure rises to 70MPa, time 2.5-3.5s by 50MPa.
Hydro-forming described in step (4) of the present invention is divided into three stage hydro-forming, and the first stage controls liquid on the inside of bend pipe
The briquetting pressure of pressure rises to 20MPa, time 1.5-2.5s by 0；Second stage control on the inside of bend pipe hydraulic briquetting pressure by
20MPa rises to 60MPa, time 2-3s；Hydraulic briquetting pressure is risen to by 60MPa on the inside of phase III control bend pipe
120MPa, time 2-3s.
The advantages of the present invention：
1. the present invention uses the outside ratio of elbow curvature part most by forming processes process twice, first time treatment process
It is hydraulic that whole bend pipe expansion piece lateral profile inwardly promotes the mold cavity of 5-8mm to carry out, and first time shaping mould type chamber is vertical
Limit that (feature is limited to finally expand herein to perimeter of section and the perimeter phase of longitudinal cross-section outside final bend pipe expansion piece etc.
The size of part is formed and hydraulic buckling process all plays very crucial effect), elbow curvature part is first limited to realize
The expansion in outside and allow the inside of bending part first to expand the advantage of mold；Simultaneously by accurately controlling four sections of hydro-forming works
Sequence so that elbow curvature sections inner side, outside wall thickness difference are small, for final expansion piece formation and it is wrinkle resistant play it is very crucial
Effect.
2. the present invention is inferior in normal expansion part type chamber the process for carrying out shaping, and second of strict control by second
In the stage and barometric gradient control of molding or trimming, the accuracy to size of final expansion piece, Er Qieben are fully ensured that
It invents the ratio between the bending radius of final bend pipe expansion piece and bend pipe caliber and can control 1.2 hereinafter, to adequately achieve small bend pipe swollen
Swollen part interior angle prevents corrugated effect.Moreover, the mold cavity that the present invention uses twice, inner wall smooth splice trace without obvious
Mark ensure that the stability in use of bulk expansion part.
3. bend pipe expansion piece of the invention defines the bending radius of bend pipe (i.e. in bend pipe when first time carrying out bend pipe
The radius of the bending circular arc of mandrel line) and bend pipe the ratio between caliber (radius) between 1.3-1.6, bend pipe is effectively ensured and scraps
Rate is low, effect easy to form, and plays very crucial guarantee for the formation of subsequent final bend pipe expansion piece.
Detailed description of the invention
The forming elbow cross section structure schematic diagram of the traditional straight forming of attached drawing 1.
The forming elbow cross section structure schematic diagram of the forming method of the present invention of attached drawing 2.
3 embodiment bend pipe structure schematic diagram of attached drawing.
Attached drawing 4 first time forming die structure schematic diagram.
Second of the forming die structure schematic diagram of attached drawing 5.
The shaping mould type chamber comparison diagram twice of attached drawing 6.
Specific embodiment
The present invention is described in further detail below by embodiment, but the present invention is not limited solely to following embodiment.
Embodiment 1
By taking 3 bend pipe of attached drawing as an example, material uses commercially available C-276 Kazakhstan nickel alloy tube blank, caliber 50mm, thickness 1.8mm；
Concrete operation step is as follows：
(1) blanking：By round pipe, the length according to required for formation of parts is cut；
(2) bend pipe：Bent according to the selection of the practical structures feature of part, push away curved, roll bending or bending machine be bent to obtain it is curved
Pipe, the ratio between the bending radius (i.e. the radius of the bending circular arc of bend pipe central axis) of bend pipe and the caliber (radius) of bend pipe are
1.5；
(3) one is formed：The type that the bend pipe that step (2) obtain is placed in first time molding die is intracavitary, mould type at this time
For the figure of chamber cross section as shown in Fig. 2, 1 ' is internal bend pipe cross section, 2 ' outsides are mold cavity cross section；Described first
Secondary molding die includes upper mold 1, lower die 2；Recess forms the groove 9 for placing bend pipe on the surface of lower die 2；The groove
9 shape close to the inside of elbow curvature part is identical as the outer profile after the expansion of final elbow member, and groove is close to elbow curvature
Outer profile after the shape in partial outside and the expansion of final elbow member is inwardly indented 6mm；The groove of upper die and lower die after molding
Size is identical, and the perimeter of the longitudinal cross-section of the closed-loop type chamber constituted after molding and the longitudinal direction after the expansion of final elbow member are transversal
The perimeter in face is equal；Then the mold upper and lower mould molding after placement bend pipe is subjected to hydro-forming, hydro-forming was divided into for four stages
Hydro-forming, the hydraulic briquetting pressure in first stage control bend pipe inside rise to 20MPa, time 2s by 0；Second stage control
Hydraulic briquetting pressure rises to 35MPa, time 2s by 20MPa on the inside of bend pipe；Phase III control bend pipe on the inside of it is hydraulic at
Type pressure rises to 50MPa, time 2s by 35MPa；Hydraulic briquetting pressure is risen to by 50MPa on the inside of fourth stage control bend pipe
70MPa, time 3s.It first limits the expansion in the outside of elbow curvature part and the inside of bending part is allowed first to expand mold, obtain
Obtain the thick part of bend pipe；
(4) two are formed：The second mold cavity after the thick part of pipe fitting after molding for the first time to be put into final bend pipe expansion
It is interior；Second mold includes upper die and lower die；Recess is formed for placing bend pipe, profile and final on the surface of lower die
The groove that outer profile after bend pipe expansion fits；The groove size of upper die and lower die is identical after molding；Then bend pipe will be placed
Mold upper and lower mould molding afterwards carries out hydro-forming, obtains final bend pipe expansion piece, the elbow curvature half of final bend pipe expansion piece
The ratio between caliber (radius) of diameter and bend pipe 1.1；Hydro-forming is divided into three stage hydro-forming, and the first stage controls liquid on the inside of bend pipe
The briquetting pressure of pressure rises to 20MPa, time 2s by 0；Second stage controls briquetting pressure hydraulic on the inside of bend pipe by 20MPa liter
To 60MPa, time 3s；Hydraulic briquetting pressure rises to 120MPa by 60MPa on the inside of phase III control bend pipe, and the time is
3s。
Specific operation：Straight tube is bent using bending machine first, obtains bending radius (the i.e. bend pipe center of bend pipe
Axis bending at circular arc radius) with the ratio between the caliber (radius) of bend pipe be 1.5.Then by bend pipe pipe be put into for the first time at
In the die cavity of pattern tool, as shown in Figure 4：The specific structure of first time molding die includes upper mold 1, lower die 2, right sealing ring 3, the right side
Push top 4, left sealing ring 5, left push top 6, groove 9；Lower die is arranged on mould bases lower inside, the surface of lower die recess and is formed with one
A groove.The groove size of upper die and lower die is identical after molding.The longitudinal section of groove be ellipse, groove be divided into bend part and
Straight line position；Bend part diameter is greater than straight line position diameter, and straight line position is two sections, is located at bend part both ends.It is recessed
The inner end at slot straight line position is connected with the both ends of bend part, and the right push top of straight line position both ends connection and left push top are had a haircut and straight
Left and right sealing ring is set between line position.The structure of the upper mold and lower die is symmetrical, and the surface of lower die is arranged in.Institute
The left push top stated is equipped with fuel feed hole 11, is connected with the recharging oil device of hydraulic press.The right push top does not set fuel feed hole.It is right push top and
Left push top is equipped with circumferential recess in front, for being embedded in right sealing ring and the sealing of left sealing ring, after push top enters groove, sealing
Circle is close to sealing with groove inner wall.Start hydraulic press, by right push top slowly feeding upwards, to coming into contact with initial pipe straight line
When the lower end surface of part, continue feeding until compressing；By left push top 6 slowly feeding upwards, to coming into contact with initial pipe straight line
When partial right side, feed-disabling；The recharging oil device for starting hydraulic press leads to oil since the fuel feed hole 11 of left push top.Work as the right side
When oil spill goes out and drains inner air tube substantially at push top, the right push top of hydraulic press slowly feeding upwards, until blocking initial pipe
When the right side, no longer spillage oil at straight line position, the process that logical oil is vented is completed；Upper mold is closed, and is bolted；Starting
The supercharging device of hydraulic press, is pressurized liquid in pipe slowly, and blunting of attention pressurization prevents tubing from bursting.Left and right push away is controlled simultaneously
Head slowly feeding inwards, feed supplement is sufficient when making tube bulge；After tubing is bonded hydraulic expanding die type chamber completely, minor radius is curved
Head Fluid pressure forming terminates, by hydraulic press release；The left and right push top of control hydraulic press is retracted；Upper mold is opened, and takes out swollen rear pipe
Material.The above process is realized and is formed for the first time.
Second of forming die structure and first time are essentially identical, and unique difference is that the shape of groove is different, therefore,
This is repeated no more.
The bend pipe angle 117.8 of final products of the present invention, the ratio between maximum caliber and lowest calibre 1.39 obtain shown in Fig. 3
Product, uniform wall thickness, corrugationless, crack-free.The thickness of dilation is up to 1.5mm, minimum 1.35mm；Error is small, wall
It is thick uniform.
The step of key of the invention is the change of mold cavity and forms twice, specific molding pressure etc. basis
Product difference is voluntarily selected, in the parameter area of hydraulic forming machine operation, such as in 25-200 megapascal, for row
Industry conventional selection is not described in detail in above-described embodiment and operating method.
Claims (2)
1. a kind of elbow member bulging prevents the corrugated method of interior angle, it is characterised in that：Step includes：
(1) blanking：Round pipe length according to required for formation of parts is cut；
(2) bend pipe：It bent according to the practical structures feature of part using bending machine, push away curved or roll bending and obtain bend pipe, it is curved
The ratio between the bending radius of pipe and the radius of bend pipe are 1.3-1.6；
(3) one is formed：The type that the bend pipe that step (2) obtain is placed in first time molding die is intracavitary；The first time molding
Mold includes upper die and lower die；Recess forms the groove for placing bend pipe on the surface of lower die；The groove is curved close to bend pipe
Outer profile after the shape of the inside of bent portions and final elbow member expand is identical, outside of the groove close to elbow curvature part
Outer profile after shape is expanded relative to final elbow member is inwardly indented 5-8mm；The groove size phase of upper die and lower die after molding
Together, and after molding the perimeter of the longitudinal cross-section of the closed-loop type chamber constituted and the week of the longitudinal cross-section after the expansion of final elbow member
Length is equal；Then the mold upper and lower mould molding after placement bend pipe is subjected to hydro-forming, first limits the outside of elbow curvature part
Expansion and allow the inside of bending part first to expand mold, obtain the thick part of bend pipe；
(4) two are formed：The thick part of pipe fitting after molding for the first time is put into the second mold cavity of final bend pipe expansion；It is described
The second mold include upper die and lower die；Recess, which is formed, on the surface of lower die expands for placing bend pipe, profile with final bend pipe
The groove that outer profile afterwards fits；The groove size of upper die and lower die is identical after molding；Then by the mold after placement bend pipe
Upper and lower mould molding carries out hydro-forming, obtains final bend pipe expansion piece, the elbow curvature radius and bend pipe of final bend pipe expansion piece
The ratio between radius less than 1.2；
Hydro-forming described in step (3) is divided into four stage hydro-forming, and the first stage controls molding pressure hydraulic on the inside of bend pipe
Power rises to 20MPa, time 1.5-2.5s by 0；Hydraulic briquetting pressure is risen to by 20MPa on the inside of second stage control bend pipe
35MPa, time 1.5-2.5s；Hydraulic briquetting pressure rises to 50MPa, time by 35MPa on the inside of phase III control bend pipe
For 1.5-2.5s；Hydraulic briquetting pressure rises to 70MPa, time 2.5-3.5s by 50MPa on the inside of fourth stage control bend pipe.
2. elbow member bulging according to claim 1 prevents the corrugated method of interior angle, it is characterised in that：Step (4) is described
Hydro-forming be divided into three stage hydro-forming, hydraulic briquetting pressure rises to 20MPa by 0 on the inside of first stage control bend pipe,
Time is 1.5-2.5s；Hydraulic briquetting pressure rises to 60MPa, time 2-3s by 20MPa on the inside of second stage control bend pipe；
Hydraulic briquetting pressure rises to 120MPa, time 2-3s by 60MPa on the inside of phase III control bend pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821722.8A CN106734419B (en) | 2015-11-23 | 2015-11-23 | A kind of elbow member bulging prevents the corrugated method of interior angle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821722.8A CN106734419B (en) | 2015-11-23 | 2015-11-23 | A kind of elbow member bulging prevents the corrugated method of interior angle |
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| CN106734419A CN106734419A (en) | 2017-05-31 |
| CN106734419B true CN106734419B (en) | 2018-11-30 |
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| CN116274589B (en) * | 2022-07-22 | 2023-11-03 | 广东思豪流体技术有限公司 | Preparation method of ultra-small caliber ultra-thin copper pipe |
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| JP3209262B2 (en) * | 1995-12-18 | 2001-09-17 | アイダエンジニアリング株式会社 | Drawing method |
| GB2332163B (en) * | 1997-12-13 | 2002-03-13 | Gkn Sankey Ltd | A hydroforming process |
| CN1644264A (en) * | 2005-01-21 | 2005-07-27 | 哈尔滨工业大学 | High-pressure forming method in tubular member for lowering forming pressure |
| CN100577319C (en) * | 2008-10-10 | 2010-01-06 | 哈尔滨工业大学 | Shape-expanding method of butt welding tube |
| CN102049443B (en) * | 2010-11-12 | 2012-12-05 | 哈尔滨工业大学 | Hydraulic forming method of asymmetric hollow pipe fitting of high expansion capacity |
| CN102319826A (en) * | 2011-07-14 | 2012-01-18 | 燕山大学 | Steel tube swelling press forming method for large-sized automobile axle housing |
| CN102319834A (en) * | 2011-07-14 | 2012-01-18 | 燕山大学 | Steel pipe expansion pressure forming method for axle housing of engineering vehicle |
| CN102554009B (en) * | 2011-12-26 | 2014-11-05 | 北京航空航天大学 | Fluid pressure forming method for small-radius elbow |
| CN103212619B (en) * | 2013-04-10 | 2015-04-22 | 宁波帕沃尔精密液压机械有限公司 | Variable-mold-clamping-force pipe internal high-pressure forming device and method |
| CN104741432B (en) * | 2015-04-20 | 2018-06-05 | 宁波钜智自动化装备有限公司 | A kind of internal high pressure forming equipment and the technique of shaping |
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Address after: 688 Jucai Road, Wangchun Industrial Park, Haishu District, Ningbo City, Zhejiang Province Patentee after: NINGBO SIMING AUTOMOBILE TECHNOLOGY Co.,Ltd. Address before: 688 Jucai Road, Wangchun Industrial Park, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO SIMING AUTOMOBILE TECHNOLOGY Co.,Ltd. |