CN105522030A - Hydraulic forming method for pipe - Google Patents
Hydraulic forming method for pipe Download PDFInfo
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- CN105522030A CN105522030A CN201410512578.5A CN201410512578A CN105522030A CN 105522030 A CN105522030 A CN 105522030A CN 201410512578 A CN201410512578 A CN 201410512578A CN 105522030 A CN105522030 A CN 105522030A
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- pipe
- pipe fitting
- forming method
- hydraulic forming
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Abstract
The invention discloses a hydraulic forming method for a pipe. The axis of the pipe is a two-dimensional curve or a three-dimensional curve. The hydraulic forming method includes the following steps that firstly, the shape characteristics of the pipe needing forming are determined; secondly, an upper mold and a lower mold are selected according to the shape characteristics of the pipe, and a pipe blank is arranged above the lower mold and jacked up through an elastic mechanism; thirdly, sealing heads are installed at the two ends of the pipe blank, at least one sealing head is provided with an input hole communicating with an inner cavity of the pipe blank, low-pressure liquid is injected into the pipe blank through the input hole, and the pressure of the low-pressure liquid ranges from 1 Mpa to 100 Mpa; and fourthly, the molds are assembled, the upper mold applies pressure to the pipe blank so that the pipe blank can overcome the elasticity action force of the elastic mechanism and move into the lower mold, and the pipe blank forms the pipe in the molds by means of the mobility of the low-pressure liquid . The hydraulic forming method can reduce work procedures.
Description
Technical field
The present invention relates to fittings hydraulic formation field, specifically, the present invention relates to a kind of hydraulic forming method of pipe fitting, especially axis is the pipe fitting of two-dimensional curve or three-dimensional curve.
Background technology
At aircraft, spacecraft and automotive field, weight reduction is to save material and operating energy is one of trend of Developing Trends of Modern Manufacturing Technology.A kind of advanced manufacturing technology manufacturing hollow light body structure part that hydroforming develops just in this context, this technology had both improve the strength and stiffness of drip molding, again saved material, reduced cost.
For the pipe fitting that axis is two-dimensional curve (plane inner bending) or three-dimensional curve (curvature of space), need first straight tube blank to be bent to the shape of pipe fitting axis, then be put into press molding in hydraulic forming mold and go out required pipe shape.See Fig. 1 a, it illustrates a kind of hydraulic formed tubing 100; See Fig. 1 b, when the pipe fitting 100 shown in wish manuscript 1a, pipe 10 need be bent to the shape of the bend pipe center line of pipe fitting 100.Afterwards, then the pipe after bending is put in mould, form.
Because the cross sectional shape of hydraulic formed tubing is often varied, there are circle, ellipse, also have rectangle, trapezoidal, more have the profiled-cross-section form of various complexity.Due to the factor of cross section bulging amount, generally speaking, except circular cross-section, the floor projection width in all the other cross sections is often less than the diameter of original pipe, if do not carry out preform, original straight tube blank (or bending rear pipe) cannot put into hydraulic forming mold; In addition, for the profiled-cross-section form of complexity, often need to design a kind of middle transition profile, to avoid producing the defects such as pipe conquassation and overlap in hydroforming process, this middle transition profile, also needs to adopt preformed mode to process.As shown in Fig. 2 a, 2b, it illustrates a kind of defect type, namely when pipe fitting axis be two-dimensional curve or three-dimensional curve time, as do not carried out preform, when patrix 1 and counterdie 2 carry out matched moulds, pipe 10 easily produces undercut.
By retrieving the document published both at home and abroad and patent, patent relevant in prior art has " a kind of pre-forming device for hollow structural component internal high pressure forming " (patent No.: 200510009646.7), this patent adopts arranges that multiple hydraulic cylinder carries out the mode of side direction propelling, carry out preform, the method can solve caliber preferably and put more greatly not progressive die tool phenomenon, is also to take more preform mode at present.There is following shortcoming in this technology: (1), for multiple different cross section, need to arrange multiple propulsion cylinder, mould structure is extremely complicated, and the circuit design of propelling and control system are also extremely complicated; (2) for various bending sections place, mould and propulsion cylinder position often produce interference; (3) when pipe fitting is less, enough spaces may be there is no in mould to arrange propulsion cylinder; (4) mould overall cost is higher.
Summary of the invention
The invention provides a kind of hydraulic forming method of pipe fitting, it can solve numerous and diverse, the inefficient problem of operation existing for existing hydraulic forming method.
For achieving the above object, the hydraulic forming method of pipe fitting of the present invention, the axis of described pipe fitting is two-dimensional curve or three-dimensional curve, and it comprises the steps:
Step one, determines the shape facility needing the pipe fitting be shaped;
Step 2, the shape facility according to pipe fitting selects upper die and lower die, is put by pipe above counterdie, by elastic mechanism jack-up;
Step 3, all install seal head in two ends of pipe, one of them seal head has the input hole communicated with pipe inner chamber, is filled with low pressure liquid by input hole in pipe, and the pressure value scope of described low pressure liquid is 1 ~ 100Mpa;
Step 4, matched moulds, patrix applies pressure to pipe makes its elastic acting force overcoming elastic mechanism move in counterdie, utilizes the mobility of low pressure liquid to make pipe be configured as pipe fitting in a mold.
Preferably, this manufacturing process of the present invention also comprises step 5, is filled with highly pressurised liquid by input hole to pipe fitting, and the pressure of highly pressurised liquid is greater than the pressure of low pressure liquid, carries out moulding to pipe fitting.
Preferably, the pressure value scope of described highly pressurised liquid is 40 ~ 400Mpa.
Preferably, in step 2, elastic mechanism is two covers, lays respectively at the below of pipe near two end positions.
Preferably, described elastic mechanism comprises nitrogen cylinder and is positioned at the rocker piece above nitrogen cylinder.
The hydraulic forming method of pipe fitting of the present invention, in matched moulds process, the elastic acting force that pipe overcomes elastic mechanism moves in counterdie, in pipe, pass into low pressure liquid simultaneously, utilize the good fluidity of low pressure liquid, making pipe being unlikely to easily deformable under the prerequisite producing the defects such as undercut, eliminating and preformed step is carried out to pipe, improve the efficiency of processing.
Accompanying drawing explanation
Fig. 1 a is a kind of structural representation of hydraulic formed tubing;
Fig. 1 b is the bend pipe of the hydraulic formed tubing for Fig. 1 a;
Fig. 2 a is the structural representation of mould and pipe, wherein not yet matched moulds;
Fig. 2 b is the structural representation of mould and pipe, completes matched moulds;
Fig. 3 a is in one embodiment of the present of invention, the structural representation of hydraulic formed tubing;
Fig. 3 b is the schematic side view of a-quadrant in Fig. 3 a;
Fig. 4 is in the present invention, the structural representation of seal head and elastic mechanism;
Fig. 5 is the process schematic representation of the hydraulic forming method of pipe fitting of the present invention;
Fig. 6 is in one embodiment of the present of invention, the manufacturing process schematic diagram of pipe fitting.
Detailed description of the invention
Below, by reference to the accompanying drawings, the concrete steps etc. of the hydraulic forming method of pipe fitting of the present invention are further described.
The invention provides a kind of hydraulic forming method of pipe fitting, for forming pipe fitting, pipe is processed into pipe fitting, concrete, this hydraulic forming method is applied to the pipe fitting that axis is two-dimensional curve or three-dimensional curve, be CN1644263 described by patent of invention background technology part as publication number, if this pipe fitting is directly put into mould and is formed, undercut defect will be produced, so in prior art, need to its preform when processing the type pipe fitting, this mode, working (machining) efficiency is lower.
This manufacturing process of the present invention comprises the steps:
Step one, determines the shape facility needing the pipe fitting be shaped.
In this step, need the shape facility of the clear and definite final pipe fitting be shaped, such as, the axis of pipe fitting be two-dimensional curve also or three-dimensional curve so that the determination of subsequent technique.
As shown in fig. 3a, it illustrates a kind of shape of pipe fitting 100, its axis is two-dimensional curve; Fig. 3 b shows the outline figure in the cross section of elliptic region in Fig. 3 a, and it is roughly rectangle, and the corner of rectangle is arc transition.
Step 2, the shape facility according to pipe fitting 100 selects counterdie 2, patrix 1, is put by pipe 10 above counterdie 2, by elastic mechanism jack-up.
In this step, patrix 1 (punch) and the counterdie 2 (die) of selecting adaptation pipe fitting 100 shape facility is needed, pipe 10 can be processed into the shape of pipe fitting 100.
As shown in Figure 4, it illustrates in general the relation of pipe 10 and patrix 1, counterdie 2 and elastic mechanism.Counterdie 2 is installed on lower bolster 3, and patrix 1 is positioned at the top of counterdie 2, and patrix 1 can depress by pressure mechanism the elastic acting force overcoming elastic mechanism, thus mould 2-in-1 with counterdie, complete forming technology.Patrix 1 and counterdie 2 can be chosen as existing structure, and this part is not primary object of the present invention, therefore no longer describes in detail.
Elastic mechanism is used for pipe 10 jack-up, and namely pipe 10 is before matched moulds, and counterdie 2 forms certain interval.
In the present invention, elastic mechanism is chosen as two covers, lays respectively at the below of pipe 10 near two end positions.The rocker piece 5 that this elastic mechanism comprises nitrogen cylinder 4 and is positioned at above nitrogen cylinder 4, rocker piece 5 directly contacts with pipe 10, and nitrogen cylinder 4, for applying elastic acting force to rocker piece 5, makes it by pipe 10 jack-up.
Step 3, in two ends of pipe 10, seal head 6 is all installed, one of them seal head 6 has the input hole 601 communicated with pipe 10 inner chamber, is filled with low pressure liquid by input hole 601 in pipe 10, and the pressure value scope of this low pressure liquid is 1 ~ 100Mpa.
The quantity of sealing 6 is two, fills in two ends of pipe 10 respectively.Certainly, at least one seal head 6 should arrange input hole 601, to input low pressure liquid in pipe 10.The break-make of input hole 601 can adopt many conventional meanses to control, and such as, seal head 6 arranges servo-valve, is controlled the break-make of this servo-valve by control unit.
Low pressure liquid fills the inner chamber of full packages base 10, and low pressure liquid has good mobility, and can be convenient to pipe fitting needs preformed region (the elliptic region A such as, in Fig. 3 a) to be shaped in a mold.
Step 4, matched moulds, patrix 1 pair of pipe 10 applies pressure makes its elastic acting force overcoming elastic mechanism move in counterdie 2, utilizes the mobility of low pressure liquid that pipe 10 is shaped in a mold.
As shown in Figure 5, according to the direction of arrow, when the die is closed, patrix 1 promotes pipe 10 and moves downward, now, full low pressure liquid has been filled in pipe 10, low pressure liquid good fluidity, makes pipe 10 have good deformation performance, under patrix 1 promotes gradually, pipe 10 deforms as the direction of arrow in figure gradually, thus obtains final pipe fitting 100.Because low pressure liquid improves the deformation performance of pipe 10, therefore it in this process, and undercut phenomenon can not occur, and ensures forming quality.
As shown in Figure 6, itself and Fig. 5 are roughly corresponding, show the change procedure of pipe 10.As shown in FIG., gradually during matched moulds, there is change procedure from left to right in straight tube pipe 10, intermediate portion (namely pointed in the prior art preformed part of needs) occurs bending and deformation gradually, finally pipe 10 is configured as the pipe fitting 100 with two-dimensional curve in mould.
This liquid can be chosen as water, also can be chosen as other media.
In addition, in order to make pipe fitting 100 obtain better forming quality, this hydraulic forming method of the present invention can also comprise,
Step 5, is filled with highly pressurised liquid by input hole 601 to pipe fitting 100, and the pressure of highly pressurised liquid is greater than the pressure of low pressure liquid, thus carries out moulding to pipe fitting.
That is, after forming, first die sinking is not carried out, but continue to pressurize to pipe fitting 100, such as improved the pressure of liquid by the mode of pressurized cylinder, and low pressure liquid and highly pressurised liquid are only because pressure is different to the name that it carries out, its concrete medium can be all water.Obviously, the span of this highly pressurised liquid should be greater than low pressure liquid, and it is specifically as follows 40 ~ 400Mpa.The value of highly pressurised liquid and low pressure liquid is preferably: low pressure liquid is 1 ~ 40Mpa, and highly pressurised liquid is 50 ~ 400Mpa.
When being filled with highly pressurised liquid, the periphery of pipe 10 expands outwardly by highly pressurised liquid effect, makes it tightly fit in mould, makes pipe fitting 100 obtain better forming quality.
Above, be only schematic description of the present invention, it will be recognized by those skilled in the art that on the basis of not departing from operation principle of the present invention, can make multiple improvement to the present invention, this all belongs to protection scope of the present invention.
Claims (5)
1. a hydraulic forming method for pipe fitting, the axis of described pipe fitting is two-dimensional curve or three-dimensional curve, it is characterized in that, comprises the steps:
Step one, determines the shape facility needing the pipe fitting be shaped;
Step 2, the shape facility according to pipe fitting selects upper die and lower die, is put by pipe above counterdie, by elastic mechanism jack-up;
Step 3, all install seal head in two ends of pipe, one of them seal head has the input hole communicated with pipe inner chamber, is filled with low pressure liquid by input hole in pipe, and the pressure value scope of described low pressure liquid is 1 ~ 100Mpa;
Step 4, matched moulds, patrix applies pressure to pipe makes its elastic acting force overcoming elastic mechanism move in counterdie, utilizes the mobility of low pressure liquid to make pipe be configured as pipe fitting in a mold.
2. the hydraulic forming method of pipe fitting as claimed in claim 1, it is characterized in that, also comprise step 5, be filled with highly pressurised liquid by input hole to pipe fitting, the pressure of highly pressurised liquid is greater than the pressure of low pressure liquid, carries out moulding to pipe fitting.
3. the hydraulic forming method of pipe fitting as claimed in claim 2, it is characterized in that, the pressure value scope of described highly pressurised liquid is 40 ~ 400Mpa.
4. the hydraulic forming method of pipe fitting as claimed in claim 1, it is characterized in that, in step 2, elastic mechanism is two covers, lays respectively at the below of pipe near two end positions.
5. the hydraulic forming method of pipe fitting as claimed in claim 4, is characterized in that, described elastic mechanism comprises nitrogen cylinder and is positioned at the rocker piece above nitrogen cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410512578.5A CN105522030A (en) | 2014-09-29 | 2014-09-29 | Hydraulic forming method for pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410512578.5A CN105522030A (en) | 2014-09-29 | 2014-09-29 | Hydraulic forming method for pipe |
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| CN105522030A true CN105522030A (en) | 2016-04-27 |
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| CN201410512578.5A Pending CN105522030A (en) | 2014-09-29 | 2014-09-29 | Hydraulic forming method for pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106881394A (en) * | 2017-04-17 | 2017-06-23 | 无锡朗贤汽车组件研发中心有限公司 | A kind of fittings hydraulic formation technique and Forming Equipments reduced based on volume |
| CN111112431A (en) * | 2019-12-20 | 2020-05-08 | 中国航发南方工业有限公司 | Method for liquid-filled extrusion forming and blade obtained thereby |
Citations (7)
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|---|---|---|---|---|
| DE69403722T2 (en) * | 1993-04-19 | 1997-09-25 | Gen Motors Corp | Process for forming a tubular element |
| CN2850751Y (en) * | 2005-12-19 | 2006-12-27 | 河南科技大学 | Apparatus for forming magnesium alloy pipe |
| US20070017267A1 (en) * | 2004-12-28 | 2007-01-25 | Nelson Wagner | Apparatus and method for performing a hydroforming process |
| CN101927291A (en) * | 2009-06-22 | 2010-12-29 | 宝山钢铁股份有限公司 | Pre-forming method for tube hydroforming and device thereof |
| US20120047979A1 (en) * | 2010-08-25 | 2012-03-01 | Schuler Inc. | Hydroforming die assembly and method for deforming a tube |
| CN102601204A (en) * | 2012-03-15 | 2012-07-25 | 吉林省元隆达工装设备有限公司 | Multi-deformed bending forming method and device for pipe fitting |
| CN103658294A (en) * | 2013-12-31 | 2014-03-26 | 一重集团大连设计研究院有限公司 | High-pressure forming method in pipe |
-
2014
- 2014-09-29 CN CN201410512578.5A patent/CN105522030A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69403722T2 (en) * | 1993-04-19 | 1997-09-25 | Gen Motors Corp | Process for forming a tubular element |
| US20070017267A1 (en) * | 2004-12-28 | 2007-01-25 | Nelson Wagner | Apparatus and method for performing a hydroforming process |
| CN2850751Y (en) * | 2005-12-19 | 2006-12-27 | 河南科技大学 | Apparatus for forming magnesium alloy pipe |
| CN101927291A (en) * | 2009-06-22 | 2010-12-29 | 宝山钢铁股份有限公司 | Pre-forming method for tube hydroforming and device thereof |
| US20120047979A1 (en) * | 2010-08-25 | 2012-03-01 | Schuler Inc. | Hydroforming die assembly and method for deforming a tube |
| CN102601204A (en) * | 2012-03-15 | 2012-07-25 | 吉林省元隆达工装设备有限公司 | Multi-deformed bending forming method and device for pipe fitting |
| CN103658294A (en) * | 2013-12-31 | 2014-03-26 | 一重集团大连设计研究院有限公司 | High-pressure forming method in pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106881394A (en) * | 2017-04-17 | 2017-06-23 | 无锡朗贤汽车组件研发中心有限公司 | A kind of fittings hydraulic formation technique and Forming Equipments reduced based on volume |
| CN111112431A (en) * | 2019-12-20 | 2020-05-08 | 中国航发南方工业有限公司 | Method for liquid-filled extrusion forming and blade obtained thereby |
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Application publication date: 20160427 |
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