CN102699175A - Hydraulic forming process of large-section variable-diameter spout - Google Patents
Hydraulic forming process of large-section variable-diameter spout Download PDFInfo
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- CN102699175A CN102699175A CN2012102146329A CN201210214632A CN102699175A CN 102699175 A CN102699175 A CN 102699175A CN 2012102146329 A CN2012102146329 A CN 2012102146329A CN 201210214632 A CN201210214632 A CN 201210214632A CN 102699175 A CN102699175 A CN 102699175A
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Abstract
The invention relates to a hydraulic forming process of a large-section variable-diameter spout. The hydraulic forming process comprises the following steps of: bending a hollow straight pipe for forming; further performing recrystallization annealing treatment after bending forming, and then placing into an expansion mold; arranging expansion mandrels at the two ends of the hollow straight pipe, wherein a through hole is arranged at the middle of the expansion mandrel at one end, and one end of the through hole is connected with a high-pressure outlet of a hydraulic device; opening the hydraulic device and expanding; opening the hydraulic device of an auxiliary pushing device; standing for 5-10 seconds after expansion pressure is stable; and taking out the hollow straight pipe, further performing the recrystallization annealing process treatment, and further performing expansion and auxiliary pushing 2-3 times to achieve the requirements. Therefore, the problems of non-uniform expansion pressure, sealing property and expansion wall thickness in hydraulic forming of the large-section variable-diameter spout can be solved. Products produced by the hydraulic forming process can meet design requirements, the number of times of expansion is reduced, the yield rate of the products is improved, the production efficiency is improved and the cost is reduced.
Description
Technical field
The present invention relates to a kind of heavy in section reducing faucet hydraulic forming technology, particularly a kind of heavy in section thin-walled reducing faucet hydraulic expanding type forming technology.
Background technology
In general, make the part of thin-walled reducing faucet, employing be the processing method that type is shaped that expands, use be the hydraulic expanding type building mortion; Comprise mould, be provided with reducing faucet shaping cavity in heavy in section in the mould, shaping cavity one end is provided with bloated core barrel; Bloated core barrel is a convex, and the centre is provided with through hole, and through hole one end connects the type hydraulic inlet joint that expands; The type hydraulic inlet joint that expands connects the hydraulic means high-pressure outlet by the road, adopt conventional method can only reach 1.4 bulging ratio, and product bulging of the present invention ratio is up to 2.04; The type coefficient is bigger because expand, and will solve the problem of the type pressure that expands, the increase of the type pressure that expands; Solve the problem of sealing simultaneously with regard to needs, even for the wall thickness that makes the type rear tubular member that expands, need to adopt some technological means to solve.
Summary of the invention
Its purpose of the present invention just is to provide a kind of heavy in section reducing faucet hydraulic forming technology, thereby has solved the even problem of type pressure, sealing and bloated type wall unevenness that expands in the reducing faucet hydraulic forming of heavy in section.Thereby make the product of producing not only meet design requirement, and reduced bloated type number of times, having improved yield of products, production efficiency improves, and cost reduces.
The technical scheme that realizes above-mentioned purpose and take comprises step,
1) hollow straight tube bends shaping according to the shape of workpiece;
2) after hollow straight tube bends shaping, handle, put into the mould of bulging then through recrystallization annealing;
3) the bulging mandrel is loaded onto at hollow straight tube two ends, wherein is provided with through hole in the middle of the end bulging mandrel, and through hole one end connects the hydraulic means high-pressure outlet;
4) open hydraulic means, under the pressure of bulging medium, hollow straight tube surface expands outwardly bulging, and bulging pressure gets final product for 1.25 times greater than theoretical value;
5) open the hydraulic means of auxiliary pull apparatus, auxiliary pull apparatus promotes the bulging mandrel and moves to hollow straight tube direction under auxilliary pushing force effect, and said auxilliary pushing force is 1/3 of a bulging pressure, and the said auxilliary movable length that pushes away is 5-15mm;
6) observe Pressure gauge, after the bulging pressure stability, leave standstill 5-10 second;
7) take out hollow straight tube and handle through recrystallization annealing process, carry out 2-3 time bulging and auxilliary pushing away again, hollow straight tube and mould are fitted, profile and mould are in full accord, reach requirement.
Compared with prior art the present invention has the following advantages.
The present invention is through solving the type pressure that expands, sealing and the auxilliary problem that pushes away the type that expands, thereby makes the product of producing not only meet design requirement, and reduced bloated type number of times, improved yield of products, and production efficiency improves, and cost reduces.
Description of drawings
Below in conjunction with accompanying drawing the present invention is made further detailed description.
Fig. 1 is this process unit structural principle sketch map.
The specific embodiment
As shown in Figure 1, comprise step,
1) hollow straight tube 9 bends shaping according to the shape of workpiece;
2) after hollow straight tube 9 bends shaping, handle, put into the mould 1 of bulging then through recrystallization annealing;
3) bulging mandrel 2 is loaded onto at hollow straight tube 9 two ends, wherein is provided with through holes in the middle of the end bulging mandrel 2, and through hole one end connects hydraulic means high-pressure outlet 8;
4) open hydraulic means, under the pressure of bulging medium, hollow straight tube 9 surfaces expand outwardly bulging, and bulging pressure gets final product for 1.25 times greater than theoretical value;
5) open the hydraulic means of auxiliary pull apparatus, auxiliary pull apparatus promotes the bulging mandrel and moves to hollow straight tube direction under auxilliary pushing force effect, and said auxilliary pushing force is 1/3 of a bulging pressure, and the said auxilliary movable length that pushes away is 5-15mm;
6) observe Pressure gauge, after the bulging pressure stability, leave standstill 5-10 second;
7) take out hollow straight tube and handle through recrystallization annealing process, carry out 2-3 time bulging and auxilliary pushing away again, hollow straight tube and mould are fitted, profile and mould are in full accord, reach requirement.
Embodiment, what present embodiment adopted is that H70 brass φ 29.5x3.5 hollow pipe passes through bend pipe, curves like dotted line shape in the mould internal cavity shown in the drawings, type becomes the workpiece shape that we will process through expanding.The general bloated type coefficient empirical value that expands the type pipe is 1.4, and the bloated type coefficient of the product in the accompanying drawing reaches 2.04, and adopting conventional method is impossible meet the requirements of.Therefore we need solve 3 problems, and 1, the type stress problems expands; 2, the sealing problem after bloated type pressure strengthens; 3, wall thickness is even relatively behind the bloated type, or pipe fitting does not break in the bloated type process.
According to this three part, introduce respectively.
The type stress problems expands: the hollow straight tube 9 of 3.5 wall thickness that we the adopt type that expands, and bloated type pressure is calculated as 67MPa by theory, is 30 MPa like the pressure of existing expansion machine; Go beyond the limit of pressure, through making supercharging device, the pressure of expansion machine is increased to 100 MPa from 30 MPa; Supercharging device comprises driving oil cylinder, and supercharging plunger, off-load parts and high-pressure outlet etc. are partly formed; At first driving oil cylinder promotes oil cylinder and moves under the pressure of hydraulic-driven oil, drives the supercharging plunger and moves; Because of the lifting surface area of driving oil cylinder is bigger than supercharging plunger lifting surface area, therefore under the supercharging plunger promoted, the pressure just pressure than former oil cylinder was big; Thereby produce high pressure from the high-pressure outlet to the workpiece, when hypertonia, from the off-load of off-load parts.Through improving; The hydraulic-driven oil of the type that expands is in hydraulic cylinder; And dynamicliquid pressure oil is from high-pressure outlet, to come out, and is an other cover loop system, and what we adopted is emulsified water; Therefore the hydraulic oil of bulging and dynamicliquid pressure oil just can separate, and the medium of the type that expands just can become emulsified water by hydraulic oil.
Sealing problem after the type pressure that expands strengthens: because of the type pressure that expands is increased to 100 MPa by 30 MPa, the thing followed is a sealing problem, combination sealing arrangement of the present invention; Solved the sealing problem under the high pressure condition well; Combination sealing arrangement is contained on the core barrel 2 that expands, and fixes through pressure cap and gland, through experiment; When pressure arrives 100 MPa, situation about not revealing.
Auxiliary pull apparatus: hollow straight tube 9 is from the 29.5x3.5 pipe fitting, and the type that expands can produce the even phenomenon of serious wall unevenness to maximum outside diameter 60.06 in the process, so pipe fitting is prone to break when expanding type, and the while is inhomogeneous because of tube wall thickness, in polishing process, also is prone to break.In order to improve yields, present invention includes auxiliary pull apparatus, auxiliary pull apparatus comprises regulating sleeve 7, regulating shaft 6; Assist and push away hydraulic inlet joint 5, shell 4, push rod 3 compositions such as grade are divided into two-way with hydraulic medium during the type that expands; Wherein lead up to the type hydraulic inlet joint that expands, enter into the type pipe fittings that expand in the hollow straight tube 9, another road gets into the auxilliary hydraulic inlet that pushes away through the auxilliary hydraulic inlet joint that pushes away; Promote to regulate mandrel, drive push rod, promote the core barrel that expands again, core barrel is a convex because of expanding; On the bloated core barrel step is arranged, when bloated core barrel moved, the workpiece of the type that expands was also along with being pushed together; Pipe fitting material movement in bloated type process is strengthened, thereby the inhomogeneities of wall thickness when expanding type is reduced, and the type number of times that expands simultaneously can reduce significantly.Through the distance between adjustment regulating sleeve and the adjusting mandrel, can adjust the auxilliary size that pushes away.
At first make one and the on all four mould of product design, hollow straight tube is curved to put into mould, the type moulding of expanding again after putting into.Through supercharging device, the type that will expand pressure is brought up to 100MPa from 30MPa, and working media becomes emulsified water by oil, realizes cleaner production; Through the combination of development of J shape slip ring and common O-ring seals, solve the sealing problem under the 100MPa pressure; The auxiliary pull apparatus of hydraulic expanding type through the softening processing before the type that pipe fitting is expanded, significantly reduces the inhomogeneities of tube wall thickness, reduces the type number of times that expands simultaneously.
Its technical process is following:
1) hollow straight tube through simulation, is confirmed the size of curved mould and the angle of bend pipe according to the shape of workpiece, puts into the mould of bulging behind the o ing;
2) after workpiece bends shaping, handle, through changing the grainiess of workpiece, the performance of compressive strain in improving through recrystallization annealing;
3) the bulging mandrel is loaded onto at the workpiece two ends, and a through hole is wherein arranged in the middle of the end mandrel, gets into bulging medium through through hole, and bulging medium is through pressure charging system;
4) under the pressure of bulging medium, hollow straight tube surface expands outwardly, and material bears tension simultaneously, by General Principle; The attenuation of material wall thickness, workpiece are risen greatly, in the big process that rises; Because of the volume change of interior is big, bulging pressure can descend, and opens the supplementary device medium this moment; Guarantee the stable of bulging pressure, calculate theoretical bulging pressure according to inner diameter of workpiece and wall thickness, the bulging pressure of actual adjustment gets final product for 1.25 times greater than theoretical value;
5) open the hydraulic means of auxiliary pull apparatus, auxiliary pull apparatus promotes the bulging mandrel and moves to hollow straight tube direction under the pressure of auxilliary recommendation matter; Form compression at material surface, offset the tension on material surface in the bulging process, generally auxilliary pushing force is about 1/3 of a bulging pressure; Guarantee that like this surface of the work is wrinkle resistant in the bulging process, the auxilliary length that pushes away must be controlled equally; Be generally 5-15mm, in initial bulging, general capping;
6) observe Pressure gauge, after the bulging pressure stability, need leave standstill 5-10 second, guarantee the stability of bulging;
7) handle through recrystallization annealing process, change the lattice of material, carry out repeatedly bulging and auxilliary pushing away, workpiece and mould are fitted, profile and mould are in full accord, reach requirement.
Claims (1)
1. a heavy in section reducing faucet hydraulic forming technology is characterized in that, comprises step,
1) hollow straight tube bends shaping according to the shape of workpiece;
2) after hollow straight tube bends shaping, handle, put into the mould of bulging then through recrystallization annealing;
3) the bulging mandrel is loaded onto at hollow straight tube two ends, wherein is provided with through hole in the middle of the end bulging mandrel, and through hole one end connects the hydraulic means high-pressure outlet;
4) open hydraulic means, under the pressure of bulging medium, hollow straight tube surface expands outwardly bulging, and bulging pressure gets final product for 1.25 times greater than theoretical value;
5) open the hydraulic means of auxiliary pull apparatus, auxiliary pull apparatus promotes the bulging mandrel and moves to hollow straight tube direction under auxilliary pushing force effect, and said auxilliary pushing force is 1/3 of a bulging pressure, and the said auxilliary movable length that pushes away is 5-15mm;
6) observe Pressure gauge, after the bulging pressure stability, leave standstill 5-10 second;
7) take out hollow straight tube and handle through recrystallization annealing process, carry out 2-3 time bulging and auxilliary pushing away again, hollow straight tube and mould are fitted, profile and mould are in full accord, reach requirement.
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| CN2012102146329A CN102699175A (en) | 2012-06-27 | 2012-06-27 | Hydraulic forming process of large-section variable-diameter spout |
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| CN2012102146329A CN102699175A (en) | 2012-06-27 | 2012-06-27 | Hydraulic forming process of large-section variable-diameter spout |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102962648A (en) * | 2012-12-04 | 2013-03-13 | 东风(十堰)车身部件有限责任公司 | Processing technology method for hollow pedal rocker arm |
| CN105834273A (en) * | 2016-03-30 | 2016-08-10 | 成霖企业股份有限公司 | Hydraulic forming method of pipe |
| CN106270097A (en) * | 2015-06-23 | 2017-01-04 | 宝山钢铁股份有限公司 | Conversion side pushes away cylinder and seals the method and device of direction of propulsion |
| CN107520328A (en) * | 2017-06-21 | 2017-12-29 | 保隆(安徽)汽车配件有限公司 | A kind of forming elbow method and bend pipe mould |
| 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 |
| CN111957804A (en) * | 2020-07-20 | 2020-11-20 | 燕山大学 | Device for liquid-filling bending forming of thin-walled tube and forming method thereof |
| CN114311625A (en) * | 2021-11-26 | 2022-04-12 | 昌河飞机工业（集团）有限责任公司 | Device and method for expanding end of large-diameter guide pipe of helicopter |
| CN116140451A (en) * | 2022-07-22 | 2023-05-23 | 广东思豪流体技术有限公司 | Preparation method of special-shaped thin-wall small-caliber copper pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962648A (en) * | 2012-12-04 | 2013-03-13 | 东风(十堰)车身部件有限责任公司 | Processing technology method for hollow pedal rocker arm |
| CN106270097A (en) * | 2015-06-23 | 2017-01-04 | 宝山钢铁股份有限公司 | Conversion side pushes away cylinder and seals the method and device of direction of propulsion |
| CN105834273A (en) * | 2016-03-30 | 2016-08-10 | 成霖企业股份有限公司 | Hydraulic forming method of pipe |
| CN105834273B (en) * | 2016-03-30 | 2017-12-05 | 成霖企业股份有限公司 | A kind of pipe fitting shaped by fluid pressure method |
| CN107520328A (en) * | 2017-06-21 | 2017-12-29 | 保隆(安徽)汽车配件有限公司 | A kind of forming elbow method and bend pipe mould |
| 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 |
| CN111957804A (en) * | 2020-07-20 | 2020-11-20 | 燕山大学 | Device for liquid-filling bending forming of thin-walled tube and forming method thereof |
| CN114311625A (en) * | 2021-11-26 | 2022-04-12 | 昌河飞机工业（集团）有限责任公司 | Device and method for expanding end of large-diameter guide pipe of helicopter |
| CN116140451A (en) * | 2022-07-22 | 2023-05-23 | 广东思豪流体技术有限公司 | Preparation method of special-shaped thin-wall small-caliber copper pipe |
| CN116140451B (en) * | 2022-07-22 | 2023-12-12 | 广东思豪流体技术有限公司 | Preparation method of special-shaped thin-wall small-caliber copper pipe |
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Application publication date: 20121003 |