CN105834273A - Hydraulic forming method of pipe - Google Patents
Hydraulic forming method of pipe Download PDFInfo
- Publication number
- CN105834273A CN105834273A CN201610190061.8A CN201610190061A CN105834273A CN 105834273 A CN105834273 A CN 105834273A CN 201610190061 A CN201610190061 A CN 201610190061A CN 105834273 A CN105834273 A CN 105834273A
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- Prior art keywords
- pipe
- mold
- bend pipe
- die cavity
- supercharging
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Classifications
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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
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a hydraulic forming method of a pipe. The hydraulic forming method of the pipe comprises the following steps that at least one section of elbow pipe, to be formed, with the round section, and a hydraulic forming mold provided with a flat and square forming mold cavity are prepared; the elbow pipe to be formed is positioned to a lower mold body of the forming mold; an upper mold body is lowered for the first time, so that the elbow pipe to be formed is fixed; liquid is injected into the elbow pipe to be formed, exhausting is conducted, and the pressure is maintained after being increased to 5-20 bar; the upper mold body is lowered for the second time, so that the elbow pipe to be formed is flattened and shaped under the supporting of the internal hydraulic pressure till mold locking is conducted after mold assembly; second-stage increasing of the hydraulic pressure injected into the elbow pipe to be formed is conducted till the hydraulic pressure reaches 700-1000 bar, then the pressure is maintained for a period of time, the appearance of the pipe is formed, and then pressure relief is conducted; and the formed flat and square pipe is taken out by opening the mold. According to the hydraulic forming method of the pipe, a flattening procedure does not need to be additionally conducted before hydraulic forming so that the forming procedures can be simplified, the production cost can be reduced, and the forming quality can be improved. In addition, through the internal hydraulic pressure of the pipe, the outer surface of the pipe is prevented from being concaved and damaged, and thus the yield is increased.
Description
Technical field
The present invention relates to the forming method of a kind of pipe fitting, carry out gold particularly to one by hydroforming die
The method belonging to pipe fitting shaped by fluid pressure.
Background technology
Pipe fitting shaped by fluid pressure (Tube Hydroforming) or pipe fitting inner high voltage molding (Internal High Pressure
Forming) technology, has been widely used in car industry, bicycle industry, bathroom hardware industry and other industries,
And have revealed that in many patented technology documents, as patent of invention that TaiWan, China notification number is 526102, in
State's Taiwan Patent number be the patent of invention of I227203, TaiWan, China Publication No. 200416080 invention special
Profit application, the patent of invention of TaiWan, China Patent No. I298655 and TaiWan, China Publication No. 201213023
Application for a patent for invention.
Bathroom hardware pipe fitting, such as faucet pipe fitting, commonly used above-mentioned hydraulic molding technique, its mould at present
The design of tool, mainly does the die cavity moulding as upper and lower mould of the external form after symmetrical expression cuts using product,
The most upper and lower mould generally configures in specular, is common in the shaped by fluid pressure of circular cross-section pipe fitting product,
But if tubing products cross section is square or deltiod, because the moulding of die cavity is also square or deltiod, therefore cross section
Just cannot directly insert in this die cavity for circular thick embryonic tube part, and flattening together must be increased before inserting
Operation, and cannot be directly flat pipe from pipe shaped by fluid pressure, the particularly length-width ratio in pipe fitting cross section reaches 1.5
Above situation.
Further, easily to form the surface that cannot repair of shaped by fluid pressure stage at tube surface recessed for above-mentioned flattening process
Fall into and damage, and the sectional twisting angle position of molding rear tubular member is relatively thin, mechanical strength and following process can be affected.
For avoiding rotation angle position the thinnest, it is necessary to use the thick embryonic tube part that pipe thickness is bigger, but the most therefore increase pipe fitting
Material cost, and the weight of tubing products.This flattening process is except increasing man-hour, also as must use
Flatten mould so that manufacturing cost increases the most relatively.
Summary of the invention
A kind of pipe fitting shaped by fluid pressure method of offer is provided, deltiod pipe fitting can be simplified
Processing procedure, raising are manufactured efficiency, are reduced processing procedure cost, and improve molding yield and quality.
To achieve these goals, the present invention provides a kind of pipe fitting shaped by fluid pressure method, comprises the following steps:
A. bend pipe to be formed and hydroforming die are prepared；
Described bend pipe to be formed is the metal tube of predetermined length, and at least formed with one section of circular cross-section on it
Position to be formed；Described hydroforming die includes mold and lower mold, described mold and lower mold
It is respectively formed with one to be mutually symmetrical and can upper mould cave and the lower die cavity of matched moulds relatively；Described upper mould cave and lower mold
Cave defines the molding die cavity of a deltiod when matched moulds；The diameter at described position to be formed is more than described one-tenth
The depth of section in pattern cave, less than the cross-sectional width of described molding die cavity；
Bend pipe the most to be formed positions；
Described bend pipe to be formed is positioned in the lower die cavity of described lower mold；
C. mold declines for the first time；
Described mold is declined for the first time, until its upper mould cave contacts the portion to be formed of described bend pipe to be formed
Stop declining after the outer surface of position；
D. liquid, aerofluxus and first stage supercharging are injected；
Carry out in injecting liquid into described bend pipe to be formed the first stage be pressurized to 5～20bar after maintain this hydraulic pressure
State, discharges the gas in bend pipe to be formed simultaneously；
E. mold second time declines；
Described mold second time is declined, makes the position to be formed of described bend pipe to be formed be able to therein
Little by little it is crushed under hydraulic pressure support state, until mold and lower mold lock mold after completing matched moulds
Position, and make the position to be formed of described bend pipe to be formed be crushed in deltiod cross section；
F. second stage supercharging and pressure release；
Carry out the liquid injected in described bend pipe to be formed maintaining after second stage is pressurized to 700～1000bar
This pressure a period of time, until the position to be formed outer surface of described bend pipe to be formed fits in described one-tenth completely
Pressure release after the inner surface of pattern cave；
G. die sinking；
Open mould, take out molding back elbow, a moulding pipe in deltiod can be obtained.
Preferably,
The width of described molding die cavity and ratio highly are at least above 1.5.
Described second stage maintains this pressure 5～30 seconds after being pressurized to 700～1000bar.
Described second stage maintains this pressure 15 seconds after being pressurized to 700～1000bar.
The mold of described mould and the matched moulds of lower mold and die sinking are along about one vertical axis Y
Direction is carried out；Described bend pipe to be formed has outside one along bending direction that inside curved arc face and curved arc face,
Curved arc face, described outside is relative with the upper mould cave of described mold, curved arc face, described inner side and described lower mold
Lower die cavity is relative.
Described bend pipe to be formed has the first end and the second end, and described first end and the second end are respectively formed with one
The individual opening radially trimmed, the bearing of trend of the opening of described first end and the opening of the second end is formed with one
Angle.
When described bend pipe to be formed is positioned described lower mold, its second end seals linking a sealing plug,
For closing described second end；Its first end can seal linking one supercharging drift when step d, to allow liquid
Body is injected by the first end.
Described lower mold includes primary module and slide block；Described primary module is the major part forming lower mold, and
It is provided with chute relative at described second end；Described slide block can be releasably the most embedding along upper and lower vertical direction
In the sliding chute being assembled in primary module, described slide block is also formed with an oblique die cavity, is available for described sealing-plug
In the part that head and bend pipe to be formed are relative with sealing match head is positioned, and described oblique die cavity can be used for constituting
A part for described lower die cavity.
Described supercharging drift connects a pressurized cylinder；By the rising of described pressurized cylinder, described supercharging can be made to rush
Before head injects liquid in step d, first seal and be connected after the first end of described bend pipe to be formed, then carry out
Liquid injects and supercharging；By the decline of described pressurized cylinder, described supercharging drift die sinking in step g can be made
Before, after first departing from the first end of described molding back elbow, then carry out die sinking program.
It is additionally provided with the perforation relative with described supercharging drift and described first end on described primary module, makes described
When supercharging drift rises, it is able to be connected in described first end by described aperture seal.
The pipe fitting shaped by fluid pressure method that the present invention provides, due to can after pipe fitting bends to bend pipe to be formed straight
Connect and utilize hydroforming die to carry out flattening and Composition, without many one before shaped by fluid pressure processing procedure
Flattening process, is also not required to increase the mould needed for this flattening process or equipment, therefore, it can simplify processing procedure,
Improve and manufacture efficiency, reduce processing procedure cost.
Further, the present invention utilizes hydroforming die to carry out flattening program, due to can be first at pipe fitting to be formed
Internal liquid maintenance hydraulic state of injecting is to provide preload pressure and support, thereby it can be assured that flattening journey
In sequence, it is to avoid outer surface of pipe fittings to be formed produces the depression as wrinkle folding and damage after shaping, and then can obtain
Obtain preferably quality and molding yield, be particularly well-suited to the formation of tubes that at least part of cross section is deltiod, example
Such as bathroom hardware pipe fittings such as watertap discharging tubes.
Accompanying drawing explanation
The flow chart of the pipe fitting shaped by fluid pressure method that Fig. 1 provides for the embodiment of the present invention；
The stereo appearance figure of the bend pipe to be formed that Fig. 2 provides for the embodiment of the present invention；
The mould that Fig. 3 provides for the embodiment of the present invention is in the three-dimensional combination figure of matched moulds state；
The mould that Fig. 4 provides for the embodiment of the present invention is in the three-dimensional exploded view of die opening state；
The mold that Fig. 5 provides for the embodiment of the present invention look up stereo appearance figure；
The three-dimensional exploded view of the lower mold that Fig. 6 provides for the embodiment of the present invention；
The sectional view along Fig. 3 hatching 1-1 that Fig. 7 provides for the embodiment of the present invention；
The sectional view along Fig. 3 hatching 2-2 that Fig. 8 provides for the embodiment of the present invention；
The partial enlarged drawing at molding die cavity in Fig. 8 that Fig. 9 provides for the embodiment of the present invention；
Figure 10 is positioned the three-dimensional appearance of lower mold for the step b bend pipe to be formed that the embodiment of the present invention provides
Figure；
The sectional view along Figure 10 hatching 3-3 that Figure 11 provides for the embodiment of the present invention；
The sectional view along Figure 10 hatching 4-4 that Figure 12 provides for the embodiment of the present invention；
The action schematic diagram that the step c mold that Figure 13 provides for the embodiment of the present invention declines for the first time；
The step c mold that Figure 14 provides for the embodiment of the present invention drops to its upper mould cave for the first time and contacts and treat into
After the outer surface of type bend pipe position to be formed, inject liquid action schematic diagram in bend pipe to be formed in step d；
The side cutaway view of Figure 14 that Figure 15 provides for the embodiment of the present invention；
The action schematic diagram that the step e mold second time that Figure 16 provides for the embodiment of the present invention declines；
Figure 17 drops to the signal of matched moulds state for the step e mold second time that the embodiment of the present invention provides
Figure；
Figure 18 is pressurized to bend pipe to be formed for the step f second stage that the embodiment of the present invention provides and completes deformation expansion
Pipe so that it is position to be formed outer surface fits in the schematic diagram of relative molding die cavity inner surface completely；
Figure 19 departs from the side-looking floor map of lower mold for the step g mold that the embodiment of the present invention provides；
The molding back elbow taken out after the step g die sinking that Figure 20 provides by the embodiment of the present invention, i.e. deltiod
The stereo appearance figure of moulding pipe；
When the mold position in the pipe fitting shaped by fluid pressure method that Figure 21 provides for the embodiment of the present invention and processing procedure
Between graph of a relation；
The pipe of the bend pipe to be formed in the pipe fitting shaped by fluid pressure method that Figure 22 provides for the embodiment of the present invention is intrinsic pressure
Power and the graph of a relation of processing time.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The present invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figures 1 to 3, the present invention provides the preferred embodiment of a kind of pipe fitting shaped by fluid pressure method, mainly
Comprise the following steps:
A. bend pipe 10 to be formed and a hydroforming die 20 is prepared；
This bend pipe 10 to be formed is the metal tube of predetermined length, and at least formed with one section of circular cross-section on it
Position to be formed 11；As Fig. 4 is to shown in 8, and this hydroforming die 20 includes a mold 21 and
Lower mold 22, this mold 21 is respectively formed with one and is mutually symmetrical and can relative matched moulds with lower mold 22
Upper mould cave 211 and lower die cavity 221；This upper mould cave 211 and lower die cavity 221 define when matched moulds one flat
Square molding die cavity 201；As it is shown in figure 9, the diameter at this position 11 to be formed is more than this molding die cavity 201
Depth of section h, less than the cross-sectional width w of this molding die cavity 201.
The ratio of the width w of the present embodiment molding die cavity 201 and height h is at least above 1.5.
Bend pipe 10 the most to be formed positions；
This bend pipe 10 to be formed is positioned in the lower die cavity 221 of this lower mold 22.
As in figure 2 it is shown, the bend pipe to be formed 10 of the present embodiment has one first end 101 and one second end 102；
When this bend pipe 10 to be formed is positioned this lower mold 22, this second end 102 seals linking a sealing
Chock plug 31, as shown in figure 11, in order to close this second end 102；This first end 101 is available for subsequent step d
Time seal linking one supercharging drift 32, as shown in figure 14, to allow liquid L thus to inject, and this supercharging
It is provided with a steam vent (not shown) at drift 32, makes the gas in this bend pipe 10 to be formed, can be in liquid
Body L thus discharges, owing to the setting of this steam vent belongs to known techniques, non-invention major technique when injecting
Feature, therefore seldom repeat at this.
C. mold 21 declines for the first time；
This mold 21 is declined for the first time, as shown in figure 13, until its upper mould cave 211 contacts this and treats into
Stop after position to be formed 11 outer surface 111 of type bend pipe 10 declining, such as Figure 14, shown in 15.This step
Main purpose is fixing bend pipe 10 to be formed, in order to subsequent forming operation.
As shown in figure 14, after the mold 21 of the present embodiment declines for the first time, its upper mould cave 211 only contacts
In this bend pipe 10 to be formed near position to be formed 11 outer surface 111 of left side the second end 102, i.e. Figure 14
In contact site s, so, just can ensure that this bend pipe 10 to be formed is able to be clamped and located at this securely
Between the upper mould cave 211 of mold 21 and the lower die cavity 221 of lower mold 22, and contribute to subsequent liquid L's
Injection, aerofluxus and first stage supercharging processing procedure.Specifically, as long as can be by this bend pipe 10 to be formed
The most clamping it is positioned between this mold 21 and lower mold 22, i.e. can reach basic positioning requirements, therefore not
Position to be formed 11 with necessary this bend pipe 10 to be formed of comprehensive engagement of upper mould cave 211 of this mold 21
Outer surface or specific part must reach over to be limited.
Further, as Figure 21 shows the graph of a relation of mold 21 position and processing time, therein tiltedly
Line M1 represents step c, it should be apparent that this mold 21 declines LAP position.
D. liquid L, aerofluxus and first stage supercharging are injected；
Carry out after the first stage is pressurized to 5～20bar (kg/cm2) in liquid L is injected this bend pipe 10 to be formed
Maintain this hydraulic state, such as Figure 14, shown in 15, the gas in bend pipe 10 to be formed is discharged simultaneously.Its
In, the liquid L of the present embodiment is water.
As shown in figure 21, after step c completes, this mold 21 stops mobile a period of time, the most graphic
In horizontal line M2, it is clear that the travel position of this mold 21 does not change, and waiting step
The carrying out of d.
Additionally, Figure 22 shows the graph of a relation of bend pipe 10 internal hydraulic pressure to be formed and processing time, oblique line P1
Represent the first stage supercharging in step d, i.e. hydraulic pressure and increase to 5～20bar from 0, and wait subsequent step e
Carrying out.
E. mold 21 second time declines；
This mold 21 second time is declined, as shown in figure 16, makes the portion to be formed of this bend pipe 10 to be formed
Position 11 is able to little by little be crushed under hydraulic pressure support state therein, until mold 21 and lower mold 22
Lock the position of mold 21 after completing matched moulds, as shown in figure 17, and make treating into of this bend pipe 10 to be formed
Type position 11 is crushed in deltiod cross section.This step main purpose is to utilize mould 20 in matched moulds process
Carry out pressing plastotype effect simultaneously, and utilize bend pipe 10 to be formed internal using suitable hydraulic pressure as preload pressure,
Position to be formed 11 outer surface 111 avoiding bend pipe 10 to be formed produces depressed deformation during plastotype.
Specifically, as shown in figure 14, the portion to be formed of the bend pipe to be formed 10 of the present embodiment is positioned at step
After the mold 21 of rapid c declines for the first time, except left side is clamped and fastened on this at the second end 102
The upper mould cave 211 of mould 21 and the lower die cavity 221 of this lower mold 22, and right side is near the first end 101
Place is contacted with this lower die cavity 221, simultaneously close to outside upper mould cave 211, remaining position all with upper and lower die cavity
211,221 at a distance, therefore, after this mold 21 second time declines, and this bend pipe to be formed
After 10 can first slightly be declined by the pressure down of this mold 21, then the molding that is crushed.
As shown in figure 21, its oblique line M3 represents step e, it is clear that this mold 21 again under
Fall LAP, to after die-closed position, just stops mobile.
As shown in figure 22, its horizontal line P2 represents step e, it is clear that at this mold 21 second
During secondary decline, the overpressure of this bend pipe 10 to be formed is still maintained at above-mentioned 5～20bar, in order in pressure
Close plastotype effect provides with hydraulic pressure in pipe and suitably support, about 15 seconds periods.
F. second stage supercharging and pressure release；
Carry out the liquid L injected in this bend pipe 10 to be formed tieing up after second stage is pressurized to 700～1000bar
Hold this pressure a period of time, until position to be formed 11 outer surface 111 of this bend pipe 10 to be formed pastes completely
Together in pressure release after this molding die cavity 201 inner surface 202, as shown in figure 18.
As shown in figure 21, its horizontal line M4 i.e. represents step f, it is clear that the row of this mold 21
Journey position there is no change, but by the overpressure supercharging again of this bend pipe 10 to be formed, oblique as in Figure 22
Line P3, it is clear that overpressure rapidly increases to 700～1000bar, period only through 1～2 second,
Afterwards, this overpressure a period of time, the present embodiment about 15 seconds, i.e. horizontal line in Figure 22 are just maintained
P4, makes the position to be formed 11 of this bend pipe 10 to be formed can during this period of time produce deformation expander effect,
And let out after deformation completes except overpressure, from the oblique line P5 shown in Figure 22 it is clear that overpressure
Removed by letting out.From the foregoing, it will be observed that step f have passed through the overpressure change of P3～P4 in Figure 22～P5.
G. die sinking；
Open mould 20, take out molding back elbow 10a, such as Figure 19, shown in 20, can obtain one in
The moulding pipe of deltiod, is particularly suitable for the pipe fitting of bathroom accessory, such as water discharge of water faucet pipe fitting.
It is apparent that, still possess circular cross-section originally at this molding back elbow 10a two ends, and
Not being formed generation deformation and expander, therefore, this bend pipe 10 to be formed of comparison just can will readily appreciate that, this reality
The position to be formed 11 of the bend pipe to be formed 10 executing example is main between this first end 101 and second end 102
In region, and this region alternative DIYU successive process not being formed, processing of cutting is removed.
Wherein, the oblique line M5 of Figure 21 represents step g, it is clear that mold 21 rises back to former
Point position.
The present embodiment is in above-mentioned steps f, after second stage is pressurized to 700～1000bar, maintains this pressure
Power 15 seconds.Due to the supercharging of this second stage, main purpose is that molding this bend pipe 10 to be formed treats into
The FINAL APPEARANCE feature at type position 11, therefore, the time that this pressure maintains can be because of the material of bend pipe 10 to be formed
The differences such as material, pipe thickness, supercharging size, and difference, therefore be not limited with the above-mentioned time, general and
Speech, maintains the time of pressure generally between 5～30 seconds.
The mold 21 of the present embodiment mould 20 and the matched moulds of lower mold 22 and die sinking are along sagging on one
The direction of straight axis Y is carried out, as shown in figure 13；This bend pipe 10 to be formed has outside one along bending direction
Curved arc face 13 inside lateral bending cambered surface 12 and, curved arc face 12 and the upper mould cave 211 of this mold 21 outside this
Relatively, inside this, curved arc face 13 is relative, as shown in Figure 2 with the lower die cavity 221 of this lower mold 22.By upper
Understanding, the mould 20 of the present embodiment is a rectilinear mould, has an advantage in that: can be by rectilinear cylinder pressure
Start, it is provided that this mould 20 is stable and enough matched moulds and locked mode pressure.
Furtherly, due to each on the first end 101 of the present embodiment bend pipe to be formed 10 and the second end 102
It is formed with an opening radially trimmed, and is formed between the bearing of trend of the opening of the first end and the second end
The angle theta of one about 25 degree, as in figure 2 it is shown, rather than extend parallel to each other, accordingly, it is to be understood that
It is that such moulding is positioned make this bend pipe 10 to be formed be difficult to maybe cannot install for this lower mold 22 times
In die cavity 221, it is also difficult to or this molding back elbow 10a cannot be taken out from step g, therefore can use combination
Formula lower mold 22 is to solve Similar Problems.
Such as Fig. 4, shown in 6 and 7, the present embodiment is convenient with a slide block 22a that can freely dismantle and a main mould
Block 22b is assembled into this lower mold 22；More specifically, this primary module 22b is to form this lower mold 22
Major part, and relative to being provided with a chute 222 at this second end 102；This slide block 22a can freely tear open
It is assembled in this chute 222 along the embedding cunning of upper and lower vertical direction with unloading, module 22a is also formed with one oblique
To die cavity 223, it is available for described sealing plug 31 and this bend pipe 10 to be formed and the opposite segments sealing match head
In being positioned, as shown in figure 11；Wherein, this oblique die cavity 223 may make up a part for this lower die cavity 221.
Accordingly, this sealing plug 31, and group can be connected in advance at the second end 102 of this bend pipe 10 to be formed
Set the oblique die cavity 223 being positioned at this slide block 22a, then by this slide block 22a together with the sealing of location on it
Chock plug 31 and bend pipe to be formed 10 assemble together and are positioned on this primary module 22b, and complete treating of step b
Molding bend pipe 10 finder.In like manner, after step g opens mould 20, can be first by molding palintrope
Pipe 10a together with sealing plug 31 and slide block 22a after this primary module 22b takes out, then by sealing plug
31 and slide block 22a separate from molding back elbow 10a, can obtain the moulding pipe of this deltiod.
It addition, the supercharging drift 32 of the present embodiment is connected to a pressurized cylinder (not shown), can note in step d
Before entering liquid L, rise sealing first with pressurized cylinder and be connected after the first end 101 of this bend pipe 10 to be formed,
Carry out injection and the supercharging of liquid L again.In like manner, it is also possible to before the die sinking of step g, first with pressurized cylinder
Decline, make this supercharging drift 32 depart from this molding back elbow 10a, then carry out die sinking program.From the foregoing, it will be observed that
Being provided with a perforation 224 on this primary module 22b, it is relative to this supercharging drift 32 and this first end 101,
During as it is shown in fig. 7, make this supercharging drift 32 rise, be able to by this perforation 224 seal be connected in this first
End 101, as shown in figure 15, for injecting liquid L.
The present embodiment is fixed with lower mold 22, and mold 21 move mode carries out matched moulds, but is not limited,
Matched moulds can also be carried out in synchronizing moving mode by upper and lower mould 21,22, or fix with mold 21, lower mold
Have 22 move modes and carry out matched moulds.
The present invention is especially suitable for the water outlet pipe fitting of bathroom hardware, such as watertap discharging tube, and can use copper,
The alloy materials such as ferrum, aluminum or titanium.
Being learnt by described above, the pipe fitting shaped by fluid pressure method of the present invention can be to be formed curved at pipe fitting bending
After pipe 10, directly utilize hydroforming die 20 and carry out flattening and Composition, without at shaped by fluid pressure
Many one flattening process before processing procedure, and increase the mould needed for this flattening process or equipment, therefore, it can
Simplify processing procedure, improve and manufacture efficiency, reduce processing procedure cost.
The present invention utilizes hydroforming die 20 to carry out flattening program, due to can be in bend pipe 10 to be formed
Liquid is injected in portion provides preload pressure and support with hydraulic pressure, thereby it can be assured that in flattening program, it is to avoid
Bend pipe 10 outer surface to be formed produces after molding the depression as wrinkle folding and damage, can obtain preferably quality and
Molding yield, particular at least partial cross section are that the formation of tubes of deltiod, such as watertap discharging tube etc. are defended
Bath five metals pipe fitting.
The shaped by fluid pressure method of the present invention is particularly suited for the more than at least 1.5 deltiod pipe fitting of height-to-breadth ratio
Molding, the ratio of the width w of above-mentioned length-width ratio the most above-mentioned molding die cavity 201 and height h.The method also may be used
It is widely used in multiple alloy material, such as alloy materials such as copper, ferrum, aluminum or titaniums.
The present invention utilizes the preload pressure adding hydraulic pressure form in flattening program in inside pipe fitting, it is provided that pipe
The inner homogeneous support that part is required during flattening, therefore, it can produce thickness deformation effect evenly,
Especially can make cross section is that the pipe fitting corner portions thickness thinning rate of flat is reduced to 20%, compared to tradition
The reduction of 30%, the present invention can be effectively increased the reduction of corner portions, it means that the thickness of pipe fitting
More uniform, therefore, it is possible to use the bend pipe to be formed 10 that thickness is thinner, and do not worry corner portions because of
Flat processing procedure causes thickness the thinnest, affects subsequent mechanical intensity and processability, and uses relatively thin to be formed curved
Pipe 10, it is also possible to save material cost, and contribute to the deformation of bending and cross section.After tested, copper is used to close
The bend pipe to be formed 10 of gold copper-base alloy, its pipe thickness can be reduced to 1.0mm from 1.2mm；Use stainless
The bend pipe to be formed 10 of Steel material, its pipe thickness then can be reduced to 0.8mm from 1.0mm.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Any amendment, equivalent or the improvement etc. made within spirit and principle, should be included in the guarantor of the present invention
Within the scope of protecting.
Claims (10)
1. a pipe fitting shaped by fluid pressure method, comprises the following steps:
A. bend pipe to be formed and hydroforming die are prepared；
Described bend pipe to be formed is the metal tube of predetermined length, and at least formed with one section of circular cross-section on it
Position to be formed；Described hydroforming die includes mold and lower mold, described mold and lower mold
It is respectively formed with one to be mutually symmetrical and can upper mould cave and the lower die cavity of matched moulds relatively；Described upper mould cave and lower mold
Cave defines the molding die cavity of a deltiod when matched moulds；The diameter at described position to be formed is more than described one-tenth
The depth of section in pattern cave, less than the cross-sectional width of described molding die cavity；
Bend pipe the most to be formed positions；
Described bend pipe to be formed is positioned in the lower die cavity of described lower mold；
C. mold declines for the first time；
Described mold is declined for the first time, until its upper mould cave contacts the portion to be formed of described bend pipe to be formed
Stop declining after the outer surface of position；
D. liquid, aerofluxus and first stage supercharging are injected；
Carry out in injecting liquid into described bend pipe to be formed the first stage be pressurized to 5～20bar after maintain this hydraulic pressure
State, discharges the gas in bend pipe to be formed simultaneously；
E. mold second time declines；
Described mold second time is declined, makes the position to be formed of described bend pipe to be formed be able to therein
Little by little it is crushed under hydraulic pressure support state, until mold and lower mold lock mold after completing matched moulds
Position, and make the position to be formed of described bend pipe to be formed be crushed in deltiod cross section；
F. second stage supercharging and pressure release；
Carry out the liquid injected in described bend pipe to be formed maintaining after second stage is pressurized to 700～1000bar
This pressure a period of time, until the position to be formed outer surface of described bend pipe to be formed fits in described one-tenth completely
Pressure release after the inner surface of pattern cave；
G. die sinking；
Open mould, take out molding back elbow, a moulding pipe in deltiod can be obtained.
Pipe fitting shaped by fluid pressure method the most according to claim 1, it is characterised in that described molding die cavity
Width with height ratio at least above 1.5.
Pipe fitting shaped by fluid pressure method the most according to claim 1, it is characterised in that described second stage
This pressure 5～30 seconds are maintained after being pressurized to 700～1000bar.
Pipe fitting shaped by fluid pressure method the most according to claim 3, it is characterised in that described second stage
This pressure is maintained 15 seconds after being pressurized to 700～1000bar.
Pipe fitting shaped by fluid pressure method the most according to claim 1, it is characterised in that described mould
Matched moulds and the die sinking of mold and lower mold be to carry out along the direction of about one vertical axis Y；Described treat
Molding bend pipe has outside one along bending direction that inside curved arc face and curved arc face, curved arc face, described outside with
The upper mould cave of described mold is relative, and curved arc face, described inner side is relative with the lower die cavity of described lower mold.
Pipe fitting shaped by fluid pressure method the most according to claim 1, it is characterised in that described to be formed curved
Pipe has the first end and the second end, described first end and the second end are respectively formed one radially trim open
Mouthful, the bearing of trend of the opening of described first end and the opening of the second end is formed with an angle.
Pipe fitting shaped by fluid pressure method the most according to claim 6, it is characterised in that described to be formed curved
When pipe is positioned described lower mold, its second end seals linking a sealing plug, is used for closing described second
End；Its first end can seal linking one supercharging drift when step d, to allow liquid to be injected by the first end.
Pipe fitting shaped by fluid pressure method the most according to claim 7, it is characterised in that described lower mold bag
Include primary module and slide block；Described primary module is the major part forming lower mold, and relative to described second end
Place is provided with chute；Described slide block the most releasably can be assembled in primary module along the embedding cunning of upper and lower vertical direction
In chute, described slide block is also formed with an oblique die cavity, be available for described sealing plug and bend pipe to be formed with
Seal the relative part of match head and be positioned interior, and described oblique die cavity can be used for constituting one of described lower die cavity
Point.
Pipe fitting shaped by fluid pressure method the most according to claim 8, it is characterised in that described supercharging drift
Connect and have a pressurized cylinder；By the rising of described pressurized cylinder, described supercharging drift can be made to inject in step d
Before liquid, first seal and be connected after the first end of described bend pipe to be formed, then carry out liquid injection and supercharging；
By the decline of described pressurized cylinder, described supercharging drift can be made before die sinking, first to depart from described one-tenth in step g
After first end of type back elbow, then carry out die sinking program.
Pipe fitting shaped by fluid pressure method the most according to claim 9, it is characterised in that described primary module
On be additionally provided with the perforation relative with described supercharging drift and described first end, when making described supercharging drift increase,
It is able to be connected in described first end by described aperture seal.
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| CN201610190061.8A CN105834273B (en) | 2016-03-30 | 2016-03-30 | A kind of pipe fitting shaped by fluid pressure method |
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| CN201610190061.8A CN105834273B (en) | 2016-03-30 | 2016-03-30 | A kind of pipe fitting shaped by fluid pressure method |
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| CN105834273B CN105834273B (en) | 2017-12-05 |
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Cited By (4)
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| CN107755513A (en) * | 2016-08-20 | 2018-03-06 | 无锡明豪汽车轻量化技术应用有限公司 | A kind of flanged not isometrical pipe fitting fixture for forming |
| CN108397266A (en) * | 2018-04-26 | 2018-08-14 | 清华大学苏州汽车研究院（相城） | A kind of monolith honeycomb catalysts intake elbow hot gas bulging process equipment and processing technology |
| CN110871239A (en) * | 2020-01-17 | 2020-03-10 | 潍坊贝金机械有限公司 | Equivalent variable water inlet pipe forming process |
| WO2020088322A1 (en) * | 2018-11-02 | 2020-05-07 | 陈志城 | Preparation process for novel hydroformed cart |
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| CN110871239B (en) * | 2020-01-17 | 2020-05-19 | 潍坊贝金机械有限公司 | Equivalent variable water inlet pipe forming process |
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|---|---|
| CN105834273B (en) | 2017-12-05 |
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