CN107716659A - A kind of double assisted thin-wall pipe deep camber centreless bending dies and its manufacturing process - Google Patents
A kind of double assisted thin-wall pipe deep camber centreless bending dies and its manufacturing process Download PDFInfo
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- CN107716659A CN107716659A CN201711081886.7A CN201711081886A CN107716659A CN 107716659 A CN107716659 A CN 107716659A CN 201711081886 A CN201711081886 A CN 201711081886A CN 107716659 A CN107716659 A CN 107716659A
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- mould
- bending
- bent
- pipe fitting
- boosting
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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
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
- B21D7/085—Bending rods, profiles, or tubes by passing between rollers or through a curved die by passing through a curved die
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Abstract
The present invention relates to a kind of double assisted thin-wall pipe deep camber centreless bending dies and its manufacturing process, belongs to pipe fitting bending forming technical field, solves to bend the technical problem that difficulty is big, pipe fitting yield rate is low in thin-wall pipe centreless bending forming process.Solution is：It includes bending die, inlay mould, clamp mould, buffer mould, pressure mould, anti-wrinkling mould and boosting mould, boosting mould is installed on the afterbody of pipe fitting to be bent, pressure mould and anti-wrinkling mould are arranged at the middle part of pipe fitting to be bent, pressure mould is provided with pressure die cavity, clamping mould and bending die are arranged at the stem of pipe fitting to be bent, bending die is provided with bending die cavity, edge mould is arranged on the gap of bending die, buffering mould is arranged at the endface position of pipe fitting stem to be bent, correspondingly additionally provide the manufacturing process of above-mentioned bending die, improve no chip bending relative bending radius beaming limit, tubing inside and outside wall wall thickness is substantially uniform, cross section distortion degree is small, meets the needs of to small relative bending radius tubing.
Description
Technical field
The invention belongs to pipe fitting bending forming technical field, more particularly to a kind of double assisted thin-wall pipe deep camber centreless
Bending die and its manufacturing process.
Background technology
Modern society is more and more stricter to energy-conservation and environmental requirement, and structure lightened product is increasingly paid attention to.Bending pipe tool
There are rational in infrastructure, accurate size, Strengthening and Toughening and low energy consumption, while light weight (the hollow knot also proposed with modern society
Structure), the requirement such as strong environmental protection match, be widely used in the industries such as Aero-Space, ship, automobile and boiler.At present, by having
Core bends the steel pipe of relative bending radius larger (be more than 2.5) without chip bending and can reach more satisfactory effect substantially, but
Relative bending radius can not save greatly very much use occasion and be taken up space.Relative bending radius smaller (1.0~1.5) although tubing
Largely save use occasion to be taken up space, but because technical conditions limit, bend the too small tubing of relative bending radius
Easily occur lateral wall excessive thinning, madial wall corrugation and section excessively flatization the defects of so that elbow member yield rate is relatively low,
Steel pipe has chip bending to bend the tubing between minimum relative bending radius 1.1~1.3 at this stage, and being compared without chip bending has
Chip bending difficulty is larger, can be looked into according to data and bend thin-wall steel tube by present existing technology, minimum relative bending radius is (at present
In production under the conditions of the most frequently used simple framework tail booster) it is 1.5~2.0, relative bending radius R/D (R-bendings half
Footpath, D-outer diameter of steel pipes) it is smaller, wall thickness reduction is bigger on the outside of bend pipe, and outboard sidewalls thickness is more uneven, and cross section distortion is also tighter
Weight.Steel pipe with pressure mould and anti-wrinkling mould inner groove faces produces certain sliding friction during being advanced axially relative, and bending die rotates
When need to there is an additional tangential stress to balance friction counterforce in pipe direction of feed, at the same time add tangential stress add
Subtract wall degree on the outside of big steel pipe, while alleviate inner side wall thickness thickened degree, the steel pipe outboard sidewalls thickness uniformity is poor.Other
Under bending condition same case, although thin-wall circular tube die cavity can be mitigated during mandrel bend to a certain extent by " pressure using having
It is flat " degree, the less tubing of relative bending radius can also be bent out, but also can excessively increase simultaneously outside wall thickness reduction
Degree, overall target are undesirable.Although application publication number is to propose a kind of drawing in the A of CN 104525740 innovation and creation
Wound form small-bend radius bent pipe mould and bending method, by proposing a kind of chute and asymmetric curvature die cavity sticks together
Bend pipe mould groove so that relative bending radius reaches 1.1 or so after bending, and ovality effect is smaller, but in the innovation and creation
Without clearly proposing to have core or without chip bending, tube wall situation of change after bending is not also provided, but tube wall situation of change
It is one critically important index of bending quality, outside wall thickness reduces the excessive bearing capacity and performance for necessarily reducing bend pipe；
Inner side wall thickness increase seriously make it that interior side-wall surface is rough, or even has wrinkling, has had a strong impact on that it dredges ability.
The content of the invention
In order to solve the deficiencies in the prior art, solve to bend hardly possible in existing thin-wall pipe centreless bending forming process
Technical problem larger, that pipe fitting yield rate is relatively low is spent, overcomes prior art condition to carry out thin-wall pipe deep camber at room temperature (small
Bending radius) centreless bending forming deficiency, improve relative bending radius be 1.0~1.5 between tube bending forming quality/
Forming limit, there is provided a kind of double assisted thin-wall pipe deep camber centreless bending dies and its manufacturing process.
The present invention is achieved by the following technical programs.
A kind of double assisted thin-wall pipe deep camber centreless bending dies, it include bending die, edge mould, clamping mould,
Buffer mould, pressure mould, anti-wrinkling mould and boosting mould, it is characterised in that：
The boosting mould is installed at the tail position of pipe fitting to be bent, and the boosting mould includes outer boosting mould and interior boosting
Mould, outer boosting mould are arranged at the outside of pipe fitting bending direction to be bent, and interior boosting mould is arranged at pipe fitting bending direction to be bent
Inner side, outer boosting mould and interior boosting mould are fluted with being correspondingly arranged respectively on the face of the contact of pipe fitting pipe outer wall to be bent；
The pressure mould and anti-wrinkling mould are arranged at the middle part of pipe fitting to be bent, and pressure mould is arranged at pipe fitting bending side to be bent
To outside, anti-wrinkling mould is arranged at the inner side of pipe fitting bending direction to be bent, the pipe with pipe fitting to be bent is provided with anti-wrinkling mould
The groove that wall is engaged, for pressure mould with being provided with pressure die cavity on the contact surface of the tube wall of pipe fitting to be bent, pressure die cavity is relative
The pressure mould surface of side is arranged to the fitting surface being engaged with lathe；The pressure die cavity is arc groove face, pressure die cavity
Bottom is arranged to bottom arc groove face, and the radius of curvature in bottom arc groove face is RPress bottom=10.36~22.36mm, bottom circle
The distance between the arc top in arc fluting face and pressure mould surface are BPressure=18.62~40.62mm, the both sides in bottom arc groove face
Connected respectively by the transition of transition arc groove surface, the radius of curvature of transition arc groove surface is RPress through=25.82~55.93mm,
The opposite side of transition arc groove surface is connected with pressure mould surface by knuckle transition, and the radius of curvature of knuckle is
RPress angle=1.0~2.0mm；
The clamping mould and bending die are arranged at the stem of pipe fitting to be bent, and clamping mould is arranged at pipe fitting bending side to be bent
To outside, bending die is arranged at the inner side of pipe fitting bending direction to be bent, and bending die is arranged to the disk with gap, disk
The face of cylinder on be provided with bending die cavity, the bending die cavity is semi-cylindrical recesses, and it is recessed that bending die trench bottom is arranged to circular arc
Groove face, the radius of curvature in arc groove face is RCurved circle=14.53~31.48mm, the arc top in arc groove face and bending mould surface it
Between distance be BIt is curved=14.06~30.47mm, arc groove face are connected with bending mould surface by knuckle, knuckle
Radius be RBent angle=1.0~2.0mm, the pressure die cavity are engaged the bend pipe mould to form pipe fitting to be bent with bending die cavity
The distance between groove, pressure die cavity and center line of matched moulds center line and pipe fitting to be bent of bending die cavity for H=0.8~
1.5mm；One end of the edge mould is arranged on the gap of bending die along the tangential direction of bending die, and clamping mould is relative with edge mould
The groove being engaged with the tube wall of pipe fitting to be bent is provided with face, and inlays the groove that is set on mould and bending die cavity is tangent；
The buffering mould is arranged at the endface position of pipe fitting stem to be bent, and buffering mould is half module, including hollow semicircle
Post mould and solid half module, solid half module are fixedly installed on one end of hollow semi-cylinders mould, and hollow semi-cylinders mould stretches into curved tube to be curved
It is engaged in the tube chamber of part and with pipe fitting inner wall, the length that hollow semi-cylinders mould is stretched into inside tube chamber is the 0.5 of clamping mould length
~0.8 times, solid half module is installed on the front end face of pipe fitting to be bent.
A kind of manufacturing process of double assisted thin-wall pipe deep camber centreless bending dies, comprises the following steps：
S1, the assembling and debugging of mould；
S2, mould speed is set in bending machine BENDING PROCESS：Relative wall thickness's range set bend pipe according to pipe fitting to be bent
The bending angular velocity omega of machine, as t/D≤0.05, bending angular velocity omega is set to 0.018rad/s~0.052rad/s, as t/D ＞
When 0.05, bending angular velocity omega is set to 0.052rad/s~0.087rad/s, and t is tube wall thickness in formula, and D is tube outer diameter；Help
Push away mould axial feed velocity VBoosting mould, pressure mould 5 axial feed velocity VPressure mouldWith bending tangential velocity VBending is tangentialBetween relation be
It is following any of various：
a、VBoosting mould=VPressure mould=(1.05~1.25) VBending is tangential；
b、VBoosting mould=VPressure mould=(0.5~0.9) VBending is tangential；
c、VBoosting mould=(1.05~1.25) VBending is tangential, VPressure mould=(0.5~0.9) VBending is tangential；
d、VBoosting mould=(0.5~0.9) VBending is tangential, VPressure mould=(1.05~1.25) VBending is tangential；
e、VOuter boosting mould=VPressure mould=(1.05~1.25) VBending is tangential, VInterior boosting mould=-(1.05~1.25) VBending is tangential；
Wherein：VOuter boosting mouldRepresent the axial velocity of outer boosting mould 7, VInterior boosting mouldBoosting mold shaft is to speed in expression；Bending die, edge
Mould, clamping mould and buffering mould synchronous axial system, speed close bending machine after setting；
S3, the size and direction setting of mould stress are buffered in BENDING PROCESS：The size for buffering mould axial stress is allowable attached
Add 0.6~0.8 times of tangential stress, the direction of buffering mould axial stress is and direction phase of the pipe fitting to be bent along axial-movement
Instead；Wherein, additional tangential stress allowable：
In formula：[σTThe additional tangential stress of]-allowable, unit are：MPa,
D-tubing linear hardening coefficient, unit are：MPa,
E-modulus of elasticity, unit are：MPa,
σb- tensile strength, unit are：MPa,
R0/d0- relative bending radius,
σs- yield stress, unit are：MPa；
S4, according to forming requirements setting angle of bend；
S5, even application lubricant on anti-wrinkling mould；
S6, pipe fitting bending：Bending machine lathe is opened, by bending die, edge mould, clamping mould, pressure mould, anti-wrinkling mould, helped outside
Mould and interior boosting mould are pushed away respectively with treating that elbow member is assembled, buffering is also installed with the head end end of pipe fitting to be bent
Mould, then according to the rate of bending bending pipe fitting of setting, until bending forming goes out required pipe fitting；
S7, unloading：After bending forming, each mould is unclamped by bending machine, tubing after bending is removed from bending machine,
Then each mould is returned into bending front position, now closes bending machine, remain bending tube forming use next time.
Further, in the step S5, the material of the lubricant of even application is MoS on anti-wrinkling mould2, the lubrication of spraying
0.05~0.1mm of thickness of agent.
The present invention has the advantages that compared with prior art.
In patent of the present invention, first, specify that bend processing method takes is centreless bending process, and centreless bend ratio has
Chip bending is more difficult to bend out that small relative bending radius, Wall thickness uniformity be higher and the less tubing of ovality effect；Secondly, this hair
It is bright to give tubing lateral wall one stress in opposite direction with additional tangential stress by buffering mould, the additional tangential drawing of buffer portion
Stress, so as to reduce outside wall thickness reduction degree and cross section distortion degree；Finally, the mould that bending technique of the present invention uses is interior
The boosting mould of outer double boosting forms and bending die, the pressure mould improved and optimizated.
Present invention improves over deep camber (small-bend radius) centreless bending die, first, what is set on bending die is curved
The pressure die cavity set on bent die cavity and pressure mould is improved to be suitable for thin-wall steel tube deep camber (small-bend radius) centreless
The optimization groove of bending forming；Secondly, one is provided with the endface position of pipe fitting stem to be bent to be used for offsetting on the outside of the tubing of part
Face adds the buffering mould of tangential stress；Finally, it is made up of close to tubing afterbody boosting mould boosting mould inside and outside detachable, and
Inside and outside boosting mould velocity magnitude and direction can individually regulate and control.
On the basis of improved bending die, it is proposed that realize relative bending radius smaller (1.0~1.3), pipe
Material Wall thickness uniformity and the comparatively ideal steel tube bending technical scheme of cross section distortion degree.By rationally determining pressure mould axial direction
The size for the power that matching and buffering mould between speed, inside and outside boosting mould axial velocity and the tangential linear velocity of bending are applied and
The problems such as direction, no chip bending relative bending radius beaming limit is improved, tubing inside and outside wall wall thickness is substantially uniform and section is abnormal
Change degree very little, can meet the needs of boiler, automobile using pipe are to small relative bending radius tubing.
Brief description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is that bending mould of the present invention assembles cross section structure diagram with pipe fitting to be bent；
Fig. 2 is bending die slot structure schematic diagram of the present invention, wherein 2 θ are the central angle in bottom arc groove face；
Fig. 3 is pressure mould slot structure schematic diagram of the present invention；
Fig. 4 is that interior boosting mould, outer boosting mould and pipe fitting to be bent assemble dimensional structure diagram；
Fig. 5 is buffering mould dimensional structure diagram；
Fig. 6 assembles dimensional structure diagram for buffering mould and pipe fitting to be bent；
Fig. 7 is pipe fitting BENDING PROCESS schematic diagram of the present invention, and wherein ω is the bending angular speed of bending die.
In figure, 1 is bending die, and 2 be edge mould, and 3 be clamping mould, and 4 be buffering mould, and 41 be hollow semi-cylinders mould, and 42 be solid
Half module, 5 be pressure mould, and 6 be anti-wrinkling mould, and 7 be outer boosting mould, and 8 be interior boosting mould, and 9 be pipe fitting to be bent.
Embodiment
The present invention is elaborated with reference to embodiment：The present embodiment is carried out premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment one
The present embodiment one is a kind of double assisted thin-wall pipe deep camber centreless bending dies.
Mould described in the present embodiment is obtained from improving existing related Tube-bending Without Mandrel bending die, improved
Set of molds includes bending die 1, edge mould 2, clamping mould 3, buffering mould 4, pressure mould 5, anti-wrinkling mould 6, outer boosting mould 7 and interior boosting mould 8,
Its structure is as shown in Figures 1 to 6.
The present embodiment specific embodiment is：
Described bending die 1 be with bending die cavity circular discs, as shown in Figure 2 bend die cavity for it is improved be suitable for it is thin
The optimization groove of wall steel pipe deep camber (small-bend radius) centreless bending forming, wherein：RCurved circle=14.64mm, BIt is curved=14.12mm,
RBent angle=1.6mm；
Described buffering mould 4 is a half module, and described half module is by stretching into hollow half inside the clamping side tubing of mould 3
Cylinder mold 41 and the solid half module 42 being stuck on tubing stem end face form；Hollow cylinder half module 41 is stretched into inside tubing, stretched
Enter its internal arcuate surface of hollow semi-cylinders mould 41 and close to the clamping side internal surface of pipe gentle touchdown of mould 3, stretch into tubing
Minister's degree is 0.6 times of clamping mould length；
The described side surface of pressure mould 5 one is the pressure mould forming face of arcs of recesses, for coordinating with the outer surface of bend pipe；Pressure
5 another side surface of power mould is the fitting surface coordinated with lathe.As shown in figure 3, pressure die cavity is suitable for thin-wall steel tube to be improved
The reversible deformation optimization groove profile of deep camber (small-bend radius) centreless bending forming, the reversible deformation flute profile first to produce on the outside of tubing
Predeformation, it is therefore an objective to ensure that bending pipes terminate rear tubing substantially by predefined curved progress, RPress bottom=10.36mm, BPressure=
18.62mm RPress through=25.82mm, RPress angle=1.6mm；The central angle in the bottom arc groove face is 2 θ, arc groove face on
Axis direction is symmetrical arranged, and wherein θ angle is 45 degree~52 degree, and θ angle is 49 degree in the present embodiment one.
Described boosting mould is divided into outer boosting mould 7 and interior boosting mould 8；Inside and outside boosting mould velocity magnitude and direction can be single
Solely regulation and control；
Described bending die cavity (Fig. 2) sticks together to form bend pipe mould groove with pressure die cavity (Fig. 3), but the two is not
In the center line matched moulds of tubing, there is certain eccentric, eccentric throw H=0.8mm.
The edge mould 2, clamping mould 3 and anti-wrinkling mould 6 are identical with existing centreless bending techniques.
Involved mold materials are 5CrNiMo mould steel in the present embodiment.
Embodiment two
The present embodiment is to carry out double boosting form deep cambers (small-bend radius) using the bend pipe mould described in embodiment one
Bending forming method without chip bending thin-wall steel tube.
The present embodiment uses material as 0Cr18Ni9, and tubing specification is 30 × t1.20 of Φ stainless steel tube, i.e. tube outer diameter
For 30mm, original wall thickness 1.20mm, relative wall thickness t/D=0.04, relative bending radius R/D=1.1.
As shown in fig. 7, specific implementation process comprises the following steps：
S1, the assembling and debugging of mould.When assembling is with debugging related die, by bending die 1, edge mould 2, clamping mould 3, buffering
Mould 4, pressure mould 5, anti-wrinkling mould 6, outer boosting mould 7 and interior boosting mould 8 are sequentially arranged on bending machine, are made bending machine after installing
Open, according to the double boosting form deep camber centreless bending forming related die adjustment method adjustment clamping moulds 3 of thin-wall steel tube, buffering mould
4th, pressure mould 5, anti-wrinkling mould 6, outer boosting mould 7 and interior boosting mould 8 so that above-described each section of mould molding surface center line and bending
Mould 1 and the center line of the edge forming face of mould 2 are located at same level；Cooperation before bending by inlaying mould 2 and clamping mould 3 will be to be bent
The bending of pipe fitting 9 clamps (friction is it is believed that infinity between edge mould 2, clamping mould 3 and pipe fitting to be bent 9), ensures pipe fitting 9 to be bent
Retained part is not in skidding in whole BENDING PROCESS；The cutting edge end of anti-wrinkling mould 6 and bending point of contact flush, and into
Shape face is brought into close contact with tubing 9 to be bent, and the faying face of anti-wrinkling mould 6 is bonded completely with the forming face of bending die 1；By suitably adjusting
The relative position of pressure mould 5, ensure tight by the forming face of the pipe fitting 9 to be bent of pressure mould 5 and anti-wrinkling mould 6 during mould assembling
Closely connected conjunction.By bending die 1, edge mould 2, clamping mould 3, buffering mould 4, pressure mould 5, anti-wrinkling mould 6, outer boosting mould 7 after the completion of to be adjusted
And interior boosting mould 8 returns to initial position.
S2, bending machine rate of bending, the axial velocity of pressure mould 5, outer boosting mould 7 and the setting of the interior axial velocity of boosting mould 8.It is curved
Pipe machine bending angular velocity omega could ensure that bending is smoothly entered according to pipe fitting relative wall thickness's range set, the suitable angular velocity omega that bends
Row and bow out the tubing of good quality, as t/D≤0.05, bending angular velocity omega scope is 0.018rad/s~0.052rad/
S, as t/D ＞ 0.05, bending angular velocity omega scope is 0.052rad/s~0.087rad/s, pipe fitting relative wall thickness in the present invention
For 0.04, so selection bending angular velocity omega is 0.035rad/s, then it is specially V to bend tangential linear velocityBending is tangential=1.155mm/
S, bending die 1, edge mould 2, clamping mould 3 and the buffering synchronous axial system of mould 4.
After bending angular velocity omega is set, setting pressure mould 5 axial velocity, outer boosting mould 7 and interior boosting mould 8 axially help
Speed is pushed away, is noted：1.15VBending is tangential=1.328mm/s, 0.85VBending is tangential=0.982mm/s, the axial velocity of pressure mould 5, outer boosting mould 7
And there are following several combining forms between the interior axial velocity of boosting mould 8 and bending tangential velocity：
(1)VBoosting mould=VPressure mould=1.15VBending is tangential=1.328mm/s；
(2)VBoosting mould=VPressure mould=0.85VBending is tangential=0.982mm/s；
(3)VBoosting mould=1.15VBending is tangential=1.328mm/s, VPressure mould=0.85VBending is tangential=0.982mm/s；
(4)VBoosting mould=0.85VBending is tangential=0.982mm/s, VPressure mould=1.15VBending is tangential=1.328mm/s；
(5)VOuter boosting mould=VPressure mould=1.15VBending is tangential=1.328mm/s, VInterior boosting mould=-1.15VBending is tangential=-1.328mm/s；
Wherein：VBoosting mould、VPressure mould、VBending is tangentialBoosting mould axial velocity, pressure mould axial velocity and bending cutting linear speed are represented respectively
Degree.Speed closes bending machine after setting.
S3, the stress intensity of mould 4 and direction setting are buffered in BENDING PROCESS；Part is offset to ensure that buffering mould 4 can be realized
Tubing lateral surface adds the effect of tangential stress, is unlikely to hinder tubing to advance again, buffers mold shaft herein and is to stress intensity
0.7 times of additional tangential stress, direction and tubing are opposite along axial-movement；Tangential stress is added in the present embodiment is
315MPa, so buffering mould axial stress is 220.5MPa.
S4, according to forming requirements setting respective curved angle, angle of bend is 180 ° in the present embodiment.
S5, one layer of lubricant of even application on anti-wrinkling mould 6, in the present embodiment two on anti-wrinkling mould 6 even application lubricant
Material be MoS2, the thickness 0.05mm of the lubricant of spraying.
S6, bending pipes.Bending machine lathe is opened, by bending die 1, edge mould 2, clamping mould 3, buffering mould 4, pressure mould 5,
Anti-wrinkling mould 6, outer boosting mould 7, interior boosting mould 8 are with treating that elbow member 9 is assembled, then according to the bending speed set in the present embodiment
Friction speed combining form bends pipe fitting 9 to 180 °, until bowing out required tubing between degree 0.035rad/s and mould.
S7, unloading：After bending forming, it will be unclamped each mould above by bending machine, by tubing after bending from bending machine
Remove, each mould is then returned into bending front position, now closes bending machine.
After the completion of BENDING PROCESS, the forming quality of production tube 9, other conditions are identical without buffering mould 4 after inspection bending
When, when the axial velocity of pressure mould 5, outer boosting mould 7, the interior axial velocity of boosting mould 8 combine in different forms with bending tangential velocity
Bending effect is different, and theoretical, simulation and experiment prove to be combined with the formula of formula (5) shape in S2, compared in S2 other four
For group situation, inside and outside wall Wall thickness uniformity and cross section distortion are more satisfactory.Buffering is further added on the basis of the formula in S2 (5)
Mould 4 adds tangential stress to offset part so that outside wall thickness reduction further reduces, pipe fitting local inclination after bending
Radius as little as 1.1, tubing inside and outside wall Wall thickness uniformity reach 93%, and cross section distortion rate is less than 5%, can meet completely boiler,
Demand of the automobile using pipe to small relative bending radius tubing.
During actual production medium quantity batch processing, S4~S7 steps are repeated, realize that elbow member is efficiently produced in batches.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Be familiar with those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in (such as are managed
Material specification, mould speed etc.), it should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with institute
Scope of the claims is stated to be defined.
Claims (4)
1. a kind of double assisted thin-wall pipe deep camber centreless bending dies, it includes bending die (1), edge mould (2), clamping
Mould (3), buffering mould (4), pressure mould (5), anti-wrinkling mould (6) and boosting mould, it is characterised in that：
The boosting mould is installed at the tail position of pipe fitting to be bent (9), and the boosting mould includes outer boosting mould (7) and wife
Mould (8) is pushed away, outer boosting mould (7) is arranged at the outside of pipe fitting to be bent (9) bending direction, and interior boosting mould (8) is arranged to be bent
On the face that the inner side of pipe fitting (9) bending direction, outer boosting mould (7) and interior boosting mould (8) contact with pipe fitting to be bent (9) pipe outer wall
It is correspondingly arranged respectively fluted；
The pressure mould (5) and anti-wrinkling mould (6) are arranged at the middle part of pipe fitting to be bent (9), and pressure mould (5) is arranged at curved tube to be curved
The outside of part (9) bending direction, anti-wrinkling mould (6) are arranged at the inner side of pipe fitting to be bent (9) bending direction, and anti-wrinkling mould is set on (6)
It is equipped with the groove being engaged with the tube wall of pipe fitting to be bent (9), the contact surface of pressure mould (5) and the tube wall of pipe fitting to be bent (9)
On be provided with pressure die cavity, pressure mould (5) surface of pressure die cavity opposite side is arranged to the fitting surface being engaged with lathe；Institute
It is arc groove face to state pressure die cavity, and pressure mould trench bottom is arranged to bottom arc groove face, the curvature in bottom arc groove face
Radius is RPress bottomThe distance between=10.36~22.36mm, the arc top and pressure mould (5) surface in bottom arc groove face is BPressure=
18.62~40.62mm, the both sides in bottom arc groove face are connected by the transition of transition arc groove surface respectively, and transition arc is recessed
The radius of curvature of groove face is RPress through=25.82~55.93mm, opposite side and pressure mould (5) surface of transition arc groove surface pass through
Knuckle transition connects, and the radius of curvature of knuckle is RPress angle=1.0~2.0mm；
The clamping mould (3) and bending die (1) are arranged at the stem of pipe fitting to be bent (9), and clamping mould (3) is arranged at curved tube to be curved
The outside of part (9) bending direction, bending die (1) are arranged at the inner side of pipe fitting to be bent (9) bending direction, and bending die (1) is set
For the disk with gap, bending die cavity is provided with the face of cylinder of disk, the bending die cavity be semi-cylindrical recesses, is bent
Die cavity bottom is arranged to arc groove face, and the radius of curvature in arc groove face is RCurved circle=14.53~31.48mm, arc groove face
Arc top and the distance between bending die (1) surface be BIt is curved=14.06~30.47mm, arc groove face and bending die (1) surface
Connected by knuckle, the radius of knuckle is RBent angle=1.0~2.0mm, the pressure die cavity are engaged with bending die cavity
Form the bend pipe mould groove of pipe fitting to be bent (9), the matched moulds center line and pipe fitting to be bent (9) of pressure die cavity and bending die cavity
The distance between center line is H=0.8~1.5mm；Tangential direction of the one end of the edge mould (2) along bending die (1) is arranged on
On the gap of bending die (1), it is provided with the opposite face of clamping mould (3) and edge mould (2) and matches with the tube wall of pipe fitting to be bent (9)
The groove of conjunction, and inlay the groove that is set on mould (2) and bending die cavity is tangent；
The buffering mould (4) is arranged at the endface position of pipe fitting to be bent (9) stem, and buffering mould (4) is half module, including hollow
Semicolumn mould (41) and solid half module (42), solid half module (42) is fixedly installed on one end of hollow semi-cylinders mould (41), hollow
Semicolumn mould (41) is stretched into the tube chambers of pipe fitting to be bent (9) and is engaged with pipe fitting inner wall, and hollow semi-cylinders mould (41) stretches into
Length inside tube chamber is 0.5~0.8 times of clamping mould (3) length, and solid half module (42) is installed on pipe fitting to be bent (9) stem
End face on.
2. a kind of double assisted thin-wall pipe deep camber centreless bending dies according to claim 1, its feature exist
In：The central angle in the bottom arc groove face is 2 θ, and arc groove face is symmetrical arranged on axis direction, wherein θ angle
For 45 degree~52 degree.
3. a kind of manufacturing process of double assisted thin-wall pipe deep camber centreless bending dies as claimed in claim 1,
It is characterized in that comprise the following steps：
S1, the assembling and debugging of mould；
S2, mould speed is set in bending machine BENDING PROCESS：Relative wall thickness's range set bending machine according to pipe fitting to be bent (9)
Angular velocity omega is bent, as t/D≤0.05, bending angular velocity omega is set to 0.018rad/s~0.052rad/s, as t/D ＞ 0.05
When, bending angular velocity omega is set to 0.052rad/s~0.087rad/s, and t is tube wall thickness in formula, and D is tube outer diameter；Boosting mould
Axial feed velocity VBoosting mould, pressure mould (5) axial feed velocity VPressure mouldWith bending tangential velocity VBending is tangentialBetween relation be under
Arrange any of various：
a、VBoosting mould=VPressure mould=(1.05~1.25) VBending is tangential；
b、VBoosting mould=VPressure mould=(0.5~0.9) VBending is tangential；
c、VBoosting mould=(1.05~1.25) VBending is tangential, VPressure mould=(0.5~0.9) VBending is tangential；
d、VBoosting mould=(0.5~0.9) VBending is tangential, VPressure mould=(1.05~1.25) VBending is tangential；
e、VOuter boosting mould=VPressure mould=(1.05~1.25) VBending is tangential, VInterior boosting mould=-(1.05~1.25) VBending is tangential；
Wherein：VOuter boosting mouldRepresent the axial velocity of outer boosting mould 7, VInterior boosting mouldBoosting mould (8) axial velocity in expression；Bending die (1),
Inlay mould (2), clamping mould (3) and buffering mould (4) synchronous axial system, speed and close bending machine after setting；
S3, the size and direction setting of mould (4) stress are buffered in BENDING PROCESS：The size for buffering mould (4) axial stress is allowable
0.6~0.8 times of additional tangential stress, the direction of buffering mould (4) axial stress are along axial-movement with pipe fitting to be bent (9)
It is in opposite direction；Wherein, additional tangential stress allowable：
<mrow>
<mo>&lsqb;</mo>
<msub>
<mi>&sigma;</mi>
<mi>T</mi>
</msub>
<mo>&rsqb;</mo>
<mo>&le;</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mn>1</mn>
<mo>-</mo>
<mi>D</mi>
<mo>/</mo>
<mi>E</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>&sigma;</mi>
<mi>b</mi>
</msub>
<mo>-</mo>
<mi>D</mi>
<mfrac>
<mn>1.6</mn>
<mrow>
<mn>2</mn>
<msub>
<mi>R</mi>
<mn>0</mn>
</msub>
<mo>/</mo>
<msub>
<mi>d</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mn>0.6</mn>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msub>
<mi>&sigma;</mi>
<mi>s</mi>
</msub>
<mo>,</mo>
</mrow>
In formula：[σTThe additional tangential stress of]-allowable, unit are：MPa,
D-tubing linear hardening coefficient, unit are：MPa,
E-modulus of elasticity, unit are：MPa,
σb- tensile strength, unit are：MPa,
R0/d0- relative bending radius,
σs- yield stress, unit are：MPa；
S4, according to forming requirements setting angle of bend；
S5, even application lubricant on anti-wrinkling mould (6)；
S6, pipe fitting bending：Bending machine lathe is opened, by bending die (1), edge mould (2), clamping mould (3), pressure mould (5), wrinkle resistant
Mould (6), outer boosting mould (7) and interior boosting mould (8) are respectively with treating that elbow member (9) is assembled, the head in pipe fitting to be bent (9)
End end is also installed with buffering mould (4), then according to the rate of bending bending pipe fitting of setting, until bending forming goes out required pipe
Part；
S7, unloading：After bending forming, each mould is unclamped by bending machine, tubing after bending removed from bending machine, then
Each mould is returned into bending front position, now closes bending machine, remains bending tube forming use next time.
A kind of 4. shaping side of double assisted thin-wall pipe deep camber centreless bending dies according to claim 3
Method, it is characterised in that：In the step S5, the material of the lubricant of even application is MoS on anti-wrinkling mould (6)2, the lubrication of spraying
0.05~0.1mm of thickness of agent.
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| CN109675977A (en) * | 2018-12-03 | 2019-04-26 | 有研工程技术研究院有限公司 | A kind of thin metallic tubd stretch bending method |
| CN110293159A (en) * | 2019-05-28 | 2019-10-01 | 南通金燃机械制造有限公司 | A kind of auxiliary bend pipe mechanism of bending machine orientation |
| CN112496105A (en) * | 2020-10-23 | 2021-03-16 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel base tube with small bending radius |
| CN113477804A (en) * | 2021-07-07 | 2021-10-08 | 珠海格力智能装备有限公司 | Round die and pipe bending machine |
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| CN109396231A (en) * | 2018-11-15 | 2019-03-01 | 太原科技大学 | A kind of deep camber centreless magnesium alloy pipe bending forming technique |
| CN109675977A (en) * | 2018-12-03 | 2019-04-26 | 有研工程技术研究院有限公司 | A kind of thin metallic tubd stretch bending method |
| CN110293159A (en) * | 2019-05-28 | 2019-10-01 | 南通金燃机械制造有限公司 | A kind of auxiliary bend pipe mechanism of bending machine orientation |
| CN112496105A (en) * | 2020-10-23 | 2021-03-16 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel base tube with small bending radius |
| CN112496105B (en) * | 2020-10-23 | 2024-02-23 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel-based pipe with small bending radius |
| CN113477804A (en) * | 2021-07-07 | 2021-10-08 | 珠海格力智能装备有限公司 | Round die and pipe bending machine |
| CN113560385A (en) * | 2021-08-02 | 2021-10-29 | 浙江金马逊机械有限公司 | Elbow pipe equipment and mechanism for inhibiting arc reverse deformation of elbow pipe in variable ellipse guide mode |
| CN113560385B (en) * | 2021-08-02 | 2023-02-10 | 浙江金马逊智能制造股份有限公司 | Elbow pipe equipment and mechanism for inhibiting arc reverse deformation of elbow pipe in variable ellipse guide mode |
| CN114798941A (en) * | 2022-03-30 | 2022-07-29 | 大族激光科技产业集团股份有限公司 | Traction device and processing equipment |
| CN114798941B (en) * | 2022-03-30 | 2023-10-03 | 大族激光科技产业集团股份有限公司 | Traction device and processing equipment |
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