CN102240716B - Bending and horizontal type reshaping method of high-pressure bend - Google Patents

Bending and horizontal type reshaping method of high-pressure bend Download PDF

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Publication number
CN102240716B
CN102240716B CN 201110148010 CN201110148010A CN102240716B CN 102240716 B CN102240716 B CN 102240716B CN 201110148010 CN201110148010 CN 201110148010 CN 201110148010 A CN201110148010 A CN 201110148010A CN 102240716 B CN102240716 B CN 102240716B
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CN
China
Prior art keywords
mould
bending
elbow
shaping
pipe
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CN 201110148010
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Chinese (zh)
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CN102240716A (en
Inventor
赵军
马瑞
翟瑞雪
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燕山大学
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Priority to CN 201110148010 priority Critical patent/CN102240716B/en
Publication of CN102240716A publication Critical patent/CN102240716A/en
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Publication of CN102240716B publication Critical patent/CN102240716B/en

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Abstract

The invention relates to a bending and horizontal type reshaping method of a high-pressure bend, mainly comprising the following steps of: 1, feeding a tube blank with the outer diameter of D(1+delta) and same wall thickness as that of the bend; 2, heating a straight tube blank into a austenite structure, and then placing on a concave mould of a bending mould preheated to 200-300 DEG C, wherein a convex mould downwards moves with a cross beam positioned on a press till the convex mould and the concave mould are closed for pressing bending deformation, after the bending mould is closed, the section of a cavity perpendicular to an axial line is in the shape of an ellipse, a long axis of the ellipse is 1.2 times of the nominal diameter of the bend, a short axis of the ellipse is 0.8 times of the nominal diameter of the bend, and the bending radius of the middle of the convex mould is set to be 1.5-2.0 times of the radius of the bend to prevent the contact area of the middle of the tube blank and the convex mould from collapses so that the tube blank is integrally bent and the section of the tube blank is changed into the shape of the ellipse at the same time; 3, horizontally placing the tube blank which is initially formed after being bent in a concave mould cavity of a reshaping mould preheated to 200-300 DEG C, wherein the motion direction of the long axis of the sectional ellipse of the tube blank is the same as that of a reshaping convex mould, the reshaping mould is combined vertically so that the tube blank undergoes circumferential compression, and the elliptical section of the tube blank is reshaped into a circular section. According to the invention, the production efficiency is greatly enhanced, and the designing and processing periods of a mould are shortened; in addition, the bending and the reshaping moulds are simple and are easy to operate, so that vast manpower and material resources are saved.

Description

High pressure elbow bends and horizontal shaping methods
Technical field
The present invention relates to a kind of die forming method, especially for the die forming method of high-voltage tube elbow.
Background technology
Elbow is weak link outstanding in the piping, and the reliability of pipeline is mainly determined by the ability to work of elbow.At present, a high pressure production method commonly used of bending has 3 kinds: pushing, bend and suppress.Pushing is modal production method, yet this process can't realize the shaping with straight end elbow; Bending method can make the wall thickness reduction of pipe, should not the less elbow of production radius of curvature.Supporting the press shaping die method in existing mainly is: the straight tube blank that diameter is equated with elbow is heated to 800 ℃, be placed on the counterdie, put into cushion block at the pipe inner chamber, simultaneously in the pipe two ends, place plug, in order to guarantee the position of cushion block and plug, main rely on manually-operated, after compacting is finished, carried out the ball set round with the inner chamber of steel ball by elbow.Therefore this press shaping die method has the following disadvantages: 1, mold attachment is many, and the compacting preliminary preparation is loaded down with trivial details, and production efficiency is low.2, generally need operating personnel more than two people, and longer in the following working time of hot environment.3, this method is not suitable for the production of the straight end of band elbow yet.
Summary of the invention
The purpose of this invention is to provide that a kind of mould is simple, easy to operate, production efficiency is high, can produce that various bands are directly held and do not bend and horizontal shaping methods with the high pressure elbow of straight end high pressure elbow.The present invention mainly adopts thermal flexure and hot tube reducing shaping.
Concrete grammar is as follows:
1, blanking: according to the dimensions of elbow product, get the circumferential compressed coefficient , according to different corner dimensions, Value between 0.05 ~ 0.09, so the pipe external diameter is the elbow nominal diameter Doubly, wall thickness is identical with elbow.Obtain the physical dimension of pipe, blanking then according to above-mentioned numerical computations.Preferably pipe blanking longitudinal cross-section is trapezoidal, and wherein pipe longitudinal cross-section size calculates by the elbow development size.
2, thermal flexure: after the straight tube blank is heated to austenite structure, place on the die that is preheated to 200 ℃ of-300 ℃ of bending moulds, when pipe blanking longitudinal cross-section when being trapezoidal, make the inclined-plane, two ends upwards.Punch comes downwards to the punch-die closure with the press entablature, suppresses flexural deformation, and its cross section becomes elliptical shape when making the pipe integrally bending.Preferably after the bending mould closure, be ellipse perpendicular to the cross section, shape chamber of axis, long axis of ellipse is 1.2 times of elbow nominal diameter, and minor axis is 0.8 times of elbow nominal diameter; Subside with the punch contact area for fear of the pipe middle part, the bending radius at punch middle part is 1.5-2.0 times of elbow radius.
3, hot tube reducing shaping: the pipe of preliminarily forming after the bending crouched to be put in the matrix cavity that is preheated to 200 ℃-300 ℃ and the cavity dimension shaping mould identical with the elbow outer wall dimension, and pipe cross section long axis of ellipse is identical with the direction of motion of shaping punch at this moment.Shaping mould is matched moulds up and down, makes pipe produce circumferentially compression, and the oval cross section of pipe is shaped to circular cross-section, and when pipe was filled the shaping mould die cavity, its local deformity just obtained repairing.
The present invention compared with prior art has the following advantages:
1, this method can be used for producing the straight end of band and not with the high pressure elbow of all size of straight end, has remedied the limitation of produced in conventional processes.
2, this method adopts bending and shaping two molds, does not use other annexes, and operation is simple, improved production efficiency.
3, the physical dimension of required shaping dies has realized parametrization in the whole process, has shortened the cycle of mould design and processing.
4, only need 1 ~ 2 operating personnel and do not need to be in the hot environment for a long time in the forming process.
Description of drawings
Fig. 1 partly cuts open the dimensions schematic diagram for elbow master of the present invention looks.
Fig. 2 partly cuts open the dimensions schematic diagram for blank master of the present invention looks.
Fig. 3 uses the state schematic perspective view for bending mould of the present invention.
Fig. 4 is the longitudinal profile schematic diagram after the bending mould closure of the present invention.
Fig. 5 is the A-A view of Fig. 4.
Fig. 6 looks schematic diagram for the pipe master of the present invention after bending.
Fig. 7 uses the state schematic perspective view for the hot tube reducing shaping mould of the present invention.
Fig. 8 uses the state schematic perspective view for the hot tube reducing shaping mould of segmentation of the present invention.
The specific embodiment
Example 1
Among Fig. 1, the nominal diameter D=500mm of elbow 1 product, wall thickness t=75mm, elbow radius R=500mm, length l=100mm is directly held in angle of bend α=90 °.Get the circumferential compressed coefficient =0.08, the pipe external diameter is 540mm, and wall thickness is identical with elbow.This pipe blanking longitudinal cross-section is trapezoidal, and as shown in Figure 2, wherein pipe longitudinal cross-section size calculates by the elbow development size.After the straight tube blank is heated to austenite structure, place on the die 2 that is preheated to 200 ℃ of bending moulds, make the inclined-plane, two ends upwards, bending mould as shown in Figure 3.Punch 3 comes downwards to the punch-die closure with the press entablature, suppresses flexural deformation, and its cross section becomes elliptical shape as shown in Figure 6 when making the pipe integrally bending.After the above-mentioned bending mould closure, be oval perpendicular to the cross section, shape chamber of axis, long axis of ellipse a=600mm, minor axis b=400mm; Subside the radius of curvature R in the middle part of the punch for fear of pipe middle part and punch contact area '=1.8R=900mm, the zone of R ' be 45 ° as shown in Figure 4 and Figure 5.The pipe of preliminarily forming after the bending crouched to be put in the matrix cavity that is preheated to 200 ℃ and the cavity dimension shaping mould identical with the elbow outer wall dimension, and pipe cross section long axis of ellipse is identical with the direction of motion of shaping punch, as shown in Figure 7.Shaping mould is matched moulds up and down, makes pipe produce circumferentially compression, and the oval cross section of pipe is shaped to circular cross-section, and when pipe was filled the shaping mould die cavity, its local deformity just obtained repairing.The required elbow of final acquisition.
Example 2
Because the pressure that needs in the shaping process is bigger, considers the restriction of plant produced condition, can use the segmentation shaping methods in shaping process, so just can reduce the requirement to equipment tonnage.Producing nominal diameter D=500mm, wall thickness t=75mm, radius R=500mm, angle [alpha]=90 °, directly holding the straight end elbow of not being with of length l=0 is example.Get the circumferential compressed coefficient =0.08, the pipe external diameter is 540mm, and wall thickness is identical with elbow.This pipe blanking longitudinal cross-section is trapezoidal, and as shown in Figure 2, wherein pipe longitudinal cross-section size calculates by the elbow development size.The thermal flexure process is identical with parameter with example 1 process, as Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6.The part of the pipe right-hand member 1/3rd of preliminarily forming after the bending crouched be put in the matrix cavity that is preheated to 300 ℃ and the cavity dimension shaping mould identical with the elbow outer wall dimension, shaping mould should be greater than 1/3rd of pipe along the axial length of pipe, the cross section long axis of ellipse is identical with the direction of motion of shaping punch, as shown in Figure 8.Shaping mould is matched moulds up and down, makes the part of pipe right-hand member 1/3rd obtain shaping.Mold lifts, and the part at pipe middle part 1/3rd is put into mould, carries out the middle part shaping; Finish the shaping of left end three/part at last.In this example, the whole shaping power of segmentation shaping force rate is little by about 2/3rds.

Claims (2)

1. a high pressure elbow bends and horizontal shaping methods,
(1) blanking: according to the dimensions of elbow product, get the circumferential compressed coefficient , Value between 0.05 ~ 0.09, so the pipe external diameter is , wall thickness is identical with elbow, obtains the physical dimension of pipe, blanking then according to above-mentioned numerical computations; It is characterized in that:
(2) thermal flexure: after the straight tube blank is heated to austenite structure, place on the die that is preheated to 200 ℃ of-300 ℃ of bending moulds, punch comes downwards to the punch-die closure with the press entablature, suppress flexural deformation, its cross section becomes elliptical shape when making the pipe integrally bending, when bending mould is closed, die cavity cross section perpendicular to axis is oval, long axis of ellipse is 1.2 times of elbow nominal diameter, minor axis is 0.8 times of elbow nominal diameter, and the bending radius at bending mould punch die cavity middle part is 1.5-2.0 times of elbow radius;
(3) hot tube reducing shaping: the pipe of preliminarily forming after the bending crouched to be put in the matrix cavity that is preheated to 200 ℃-300 ℃ and the cavity dimension shaping mould identical with the elbow outer wall dimension, pipe cross section long axis of ellipse is identical with the direction of motion of shaping punch, shaping mould is matched moulds up and down, make pipe produce circumferentially compression, the oval cross section of pipe is shaped to circular cross-section.
2. high pressure elbow according to claim 1 bends and horizontal shaping methods, and it is characterized in that: hot tube reducing shaping can be adopted whole shaping and segmentation shaping.
CN 201110148010 2011-06-03 2011-06-03 Bending and horizontal type reshaping method of high-pressure bend CN102240716B (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN102430626B (en) * 2011-11-23 2013-10-02 吉林昊宇电气股份有限公司 Thin-wall equant (small)-radius elbow secondary forming device and secondary forming method thereof
CN102699152A (en) * 2012-05-31 2012-10-03 江苏华阳管业股份有限公司 Metal pipe blank shaping machine
CN102974667A (en) * 2012-10-16 2013-03-20 江苏华阳金属管件有限公司 Elbow rough machining device
CN103302175A (en) * 2013-07-05 2013-09-18 江阴中南重工股份有限公司 Method for producing seamless punched elbow
CN103394547B (en) * 2013-07-30 2015-08-19 西安优耐特容器制造有限公司 A kind of bend forming method
CN103894444B (en) * 2014-03-06 2016-08-17 燕山大学 Single weld-seam bend method for press forming
CN106391862A (en) * 2016-06-21 2017-02-15 合肥和安机械制造有限公司 Steel pipe bending forming die
CN106541036A (en) * 2016-11-24 2017-03-29 陈浩祥 Make the mould of pressing connecting bend
CN107803422A (en) * 2017-10-27 2018-03-16 隆昌山川精密焊管有限责任公司 A kind of left back seat support basin back elbow process for stamping of automobile
CN108889792B (en) * 2018-05-25 2020-03-17 无锡市新峰管业有限公司 Forming process of large-caliber super-wall-thickness seamless elbow pipe fitting
CN110560528A (en) * 2019-10-17 2019-12-13 哈尔滨工业大学(威海) Process method for reducing resilience of tubular part

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CN101234404A (en) * 2008-02-27 2008-08-06 江阴中南重工股份有限公司 Method for producing metal pipe bend
CN101767131A (en) * 2010-02-03 2010-07-07 江阴市南方管件制造有限公司 Hot-press molding method for thick-walled elbow without inner core
CN201543720U (en) * 2009-12-01 2010-08-11 无锡市新峰管业有限公司 Hot-press forming mould of thickness elbow tube fitting
CN201543719U (en) * 2009-12-01 2010-08-11 无锡市新峰管业有限公司 Hot-press forming mold for thick-wall elbow pipe fitting with straight pipe section

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CN1850390A (en) * 2006-04-29 2006-10-25 渤海船舶重工有限责任公司 Method for making steel elbow with straight tube section
CN101234404A (en) * 2008-02-27 2008-08-06 江阴中南重工股份有限公司 Method for producing metal pipe bend
CN201543720U (en) * 2009-12-01 2010-08-11 无锡市新峰管业有限公司 Hot-press forming mould of thickness elbow tube fitting
CN201543719U (en) * 2009-12-01 2010-08-11 无锡市新峰管业有限公司 Hot-press forming mold for thick-wall elbow pipe fitting with straight pipe section
CN101767131A (en) * 2010-02-03 2010-07-07 江阴市南方管件制造有限公司 Hot-press molding method for thick-walled elbow without inner core

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