CN103272879A - Upset-bulge compound internal high pressure forming method and device for long and thin deformed straight pipe - Google Patents

Upset-bulge compound internal high pressure forming method and device for long and thin deformed straight pipe Download PDF

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Publication number
CN103272879A
CN103272879A CN2013102049874A CN201310204987A CN103272879A CN 103272879 A CN103272879 A CN 103272879A CN 2013102049874 A CN2013102049874 A CN 2013102049874A CN 201310204987 A CN201310204987 A CN 201310204987A CN 103272879 A CN103272879 A CN 103272879A
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China
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drift
bulging
mold
mobile
bed die
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CN2013102049874A
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Chinese (zh)
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CN103272879B (en
Inventor
刘�文
莫伟伟
俞凯逸
张国俊
毛睿
张初旻
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浙江大学宁波理工学院
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Abstract

The invention adopts an upset-bulge compound internal high pressure forming method and integrates an upset-bulge forming process with an internal high pressure shaping process, and the upset-bulge process is carried out in a mould at first and then high-pressure liquid is filled for high pressure shaping, so that the technological process is short, and the efficiency is high. The process integrates an upsetting effect, a bulging and expanding effect and a hydraulic bugling effect, so that the time is saved and the efficiency is high; the wall thickness distribution of a forming region can be controlled through the upset-bulge process; the forming effect can be controlled through the punch head travelling speed; the final forming shape of the forming region is controlled through a mould cavity of a mould; and the method has the advantages of the upsetting effect, the bulging and expanding effects and the hydraulic bulging effect, and makes up for the shortcomings in the upsetting effect, the bulging and expanding effect and the hydraulic bulging effect.

Description

A kind of elongated bloated compound inside high-pressure forming method of special-shaped straight tube rammer and device
Technical field
This technology belongs to the forming tubular product field, particularly the bloated compound inside high-pressure forming method of the rammer of elongated straight tubing.
Background technology
Shape tube can rise by water usually and form, and perhaps forms by the inner high voltage technology.The tubing bulging is to utilize liquid to make a kind of Technology of Plastic Processing of component shaping as the power transmission medium, and complex section and less reducing corner can paste mould well under certain forming pressure.Internal high pressure forming is to carry out axial feed supplement and the attenuate that reduces the material wall thickness in the process of bulging.The shape tube that surpasses the ultimate deformation amount of material for particularly local deformation amount of slender type straight tube, when rising, pure water can break because of the undue attenuate in part, during the inner high voltage feed supplement can because the long feed supplement effect of tubing that to be embodied in end upsetting serious is more, and the deformed area can not get feed supplement, and the flexing inefficacy takes place long tube easily simultaneously.
Rammer is expanded into that shape is that the inventor proposes the compound non-attenuate manufacturing process of a kind of tube wall thickness of a kind of upset muscle and bulging can be used as the preforming process of forming high pressure in pipe.The present invention is directed to leptosomatic special-shaped straight tube spare is shaped, a kind of compound inside high-pressure forming method that expands of upsetting has further been proposed, integrating upsets is expanded into the advantage of shape technology and inner high voltage shaping technique, technological process is short, efficient is high, the technological requirement bloated or that internal high pressure forming can't be realized of upsetting can be shaped, to the forming high pressure in pipe technology, particularly the part forming of the super deformed limit of slender type local deformation amount has great using value.
Summary of the invention
Elongated special-shaped straight tube of the present invention upset expand that compound internal high pressure forming device comprises cutting somebody's hair in counterdie fixed head, a left side, left drift, pipe, upper mould fixed plate, the right side are cut somebody's hair, right drift, cover half, dynamic model; Wherein, cover half comprises fixedly mold and fixedly bed die, and dynamic model comprises mobile mold and mobile bed die; Described cover half is used for the locking part and limits it and move along axis; Described dynamic model is used for holding part tightly and promotes part under the effect of feed supplement hydraulic cylinder moving the realization jumping-up to cover half together.Wherein, upper mould fixed plate is arranged on the upper end of described device, and described fixedly mold is fixed in the downside of upper mould fixed plate, and the counterdie fixed head is arranged on the lower end of described device, and described fixedly bed die is fixed in the upside of counterdie fixed head; Described left drift runs through and is positioned on the axis direction of cutting somebody's hair on a described left side, and at the relative other end, described right drift runs through and is positioned on the axis direction of cutting somebody's hair on the described right side; Described fixedly mold has a groove, so that described mobile patrix prodigiosin holds wherein, described mobile bed die also has a groove, so that described mobile counterdie prodigiosin holds wherein.
The present invention adopts the compound inside high-pressure forming method that upset to expand, and integrating upsets expands and the inner high voltage shaping process, and upsetting earlier in mould expands feeds highly pressurised liquid then and carry out the high pressure shaping, and technological process is short, the efficient height.This technology has jumping-up effect, bulging hole enlargement effect and hydraulic pressure bulging concurrently and forms in one, save time, the efficient height, by the bloated shape district Thickness Distribution that may be controlled to of upsetting, may be controlled to the shape effect by the drift gait of march, by the final shaping form in mold cavity control shaping district, have the advantage of jumping-up effect, bulging hole enlargement and hydraulic pressure bulging concurrently, remedy the shortcoming that exists separately.
Adopt the preforming technique that expands of upsetting, make the pipe fitting local deformation reach non-attenuate bulging effect.To treat that by mobile mould up and down the position of bulging carries out feed supplement, and by the polyurethane rubber piece in the extruded tube, tubing outwards be expanded, and can reach and the tubing local location is upset be expanded into shape, and reach diameter and become big and the wall thickness effect of attenuate not.At inner filled polyurethane rubber, not only tubing is played a supportive role, can prevent defectives such as tubing inwardly subsides, simultaneously, the bulging power that the drift feeding produces polyurethane rubber, the resistance of rammer muscle feeding in the feeding that can reduce to cut somebody's hair, and accelerate pipe plastic deformation.
The elastomer polyurethane rubber inside that the rammer type of being expanded into is used has the water filling aperture, and Surface Machining is fluted.Apparatus of the present invention adopt polyurethane rubber as the flexible member of the bloated technology of upsetting, and its design has hole and the arc groove of some.It is the relation of matched in clearance with pipe, makes polyurethane rubber put into pipe easily.Upset and expand when finishing, polyurethane rubber is close to part, and liquid can charge into tube wall by water injection hole and surface groove, and shaping is shaped in that further increased pressure lower stress is even to make tubing.After the shaping, rubber recoils to original shapes and takes out from pipe fitting.
Be to control the non-attenuate effect that expands of upsetting, the matching relationship between appropriate design and the bloated feed supplement amount of control rammer and the elastomer deflection, the i.e. load path of upsetting and being expanded into shape.Can be expanded into shape load path control formation of parts wall thickness and rammer bulging shape by optimizing to upset.By cae analysis optimization and die trial, can determine the optimum process parameter rapidly, and implement fast by left and right drift and mobile upper and lower mould setting.
The bloated compound inner high voltage technology of upsetting adopts a mold, realizes multiple tracks technology.Adopt combination process and the bulging technology of expanding of upsetting, mould need be split into two covers at least, be respectively applied to upset and expand and the hydraulic pressure bulging.By open the liquid injection hole of some at left and right sides plunger rod, the present invention can realize upsetting behind the bloated combination process, need not more mold exchange, directly carries out the hydraulic pressure bulging.Compare many molds, the present invention greatly reduces development cost and the construction cycle of mould.
Description of drawings
Fig. 1 is the structure diagram of building mortion.
Fig. 2 is the axis of no-feathering mapping of building mortion.
Fig. 3 is the early-stage preparations schematic diagram of manufacturing process.
Fig. 4 is the matched moulds schematic diagram.
Fig. 5 is the compound schematic diagram that expands of upsetting.
Fig. 6 is the bulging schematic diagram.
Fig. 7 is drift schematic diagram with holes.
Fig. 8 is with holes and groove polyurethane rubber piece schematic diagram.
The specific embodiment
Structure diagram of the present invention as shown in Figure 1 and Figure 2.This equipment need realize upsetting muscle, bulging and three kinds of feedings of hydraulic pressure bulging are respectively by rammer muscle feeding hydrocylinder, bulging feeding hydrocylinder with charge into highly pressurised liquid and realize.After the locked mode cylinder drives the descending matched moulds of cope match-plate pattern, mobile patrix and fixedly patrix respectively with mobile counterdie and fixing counterdie matched moulds.Fixedly patrix and fixedly counterdie be referred to as cover half, cover half is used for the locking part and limits it and move along axis.Mobile patrix and mobile counterdie are referred to as dynamic model, dynamic model is used for holding part tightly and promotes part under the effect of feed supplement hydraulic cylinder moving to cover half together, and left and right sides drift is used for the extruding polyurethane rubber, and rubber is squeezed to stressed weakness zone distortion, and then local bulging, realize jumping-up.Wherein left and right drift has the water filling aperture, has water filling aperture and groove on the polyurethane rubber, and the later stage can feed high-pressure liquid medium, realizes the topping up bulging.
(1) work early-stage preparations: fixedly mold (6), bed die (2) fix separately and open, mobile bed die (12) is placed on fixedly bed die interior (2), a left side drift (4), right drift (11), cutting somebody's hair (3) in a left side and cuts somebody's hair in the right side, and (10) stay in the appropriate location through control system, have been pre-charged with polyurethane rubber (8) (as shown in Figure 3) in the pipe (5);
(2) matched moulds: pipe is put into the counterdie mold cavity, the patrix that moves moulds (9) matched moulds and the descending matched moulds of fixed mould patrix (12) (as shown in Figure 4);
(3) upset to expand compound: move moulds (9), (12) are held tubing tightly, the right side cut somebody's hair (10) promote mobile mold (9) and mobile bed die (12) moves ahead, realize jumping-up and feed supplement, a while left side cut somebody's hair (3) move ahead and prop up the tubing left end.Namely gather " clout " in the district that is shaped, meanwhile left drift (4), right drift (11) move ahead, extruding polyurethane rubber (8), district's pipe bulging is shaped under the effect of pressure, jumping-up feed supplement amount (path increment of cutting somebody's hair) is carried out synchronously with tube bulge amount (punch stroke amount), load path is optimized, finishes the non-attenuate of preformed member wall thickness.At this moment the most of zone except knuckle has been formed in the preliminarily forming (as shown in Figure 5) of realizing part under the supporting role of inner polyurethane rubber (8);
Bulging: after preliminarily forming was finished, left drift (4), right drift (11) stopped to advance arrival moisturizing position, by left and right drift the moisturizing exhaust are carried out in tubing inside.By arriving default after the moisturizing time, the distance that left drift (4), right drift (11) system of moving on set reaches the sealing position.Tubing inside was full of liquid medium and realized sealing simultaneously this moment.Inject highly pressurised liquid by the aperture on the plunger rod of the left and right sides in pipe, liquid enters quick filling inside pipe wall by the rubber groove, makes knuckle fit mould fully and is configured as needed workpiece (as shown in Figure 6).

Claims (5)

1. an elongated special-shaped straight tube compound internal high pressure forming device that expands of upsetting is characterized in that: this device comprises cutting somebody's hair in counterdie fixed head, a left side, left drift, pipe, upper mould fixed plate, the right side are cut somebody's hair, right drift, cover half, dynamic model; Wherein, cover half comprises fixedly mold and fixedly bed die, and dynamic model comprises mobile mold and mobile bed die; Described cover half is used for the locking part and limits it and move along axis; Described dynamic model is used for holding part tightly and promotes part under the effect of feed supplement hydraulic cylinder moving the realization jumping-up to cover half together.
2. device as claimed in claim 1, wherein, upper mould fixed plate is arranged on the upper end of described device, and described fixedly mold is fixed in the downside of upper mould fixed plate, the counterdie fixed head is arranged on the lower end of described device, and described fixedly bed die is fixed in the upside of counterdie fixed head; Described left drift runs through and is positioned on the axis direction of cutting somebody's hair on a described left side, and at the relative other end, described right drift runs through and is positioned on the axis direction of cutting somebody's hair on the described right side; Described fixedly mold has a groove, so that described mobile patrix prodigiosin holds wherein, described mobile bed die also has a groove, so that described mobile counterdie prodigiosin holds wherein.
3. device as claimed in claim 1 or 2, wherein said left and right drift has the water filling aperture, has water filling aperture and groove on the polyurethane rubber, and the later stage feeds high-pressure liquid medium, in order to realize the topping up bulging.
4. an employing is as the elongated special-shaped straight tube of building mortion as described in claim 1 or the 2 or 3 compound inside high-pressure forming method that expands of upsetting, it is characterized in that: described device can realize upsetting muscle, bulging and three kinds of feedings of hydraulic pressure bulging, respectively by rammer muscle feeding hydrocylinder, bulging feeding hydrocylinder with charge into highly pressurised liquid and realize; After the locked mode cylinder drives the descending matched moulds of upper mould fixed plate, mobile mold, fixedly mold respectively with mobile bed die, fixing bed die matched moulds; Left side drift, right drift are used for the extruding polyurethane rubber, and rubber is squeezed to stressed weakness zone distortion, and then realizes bulging.
5. method as claimed in claim 3, this manufacturing process specific implementation step is as follows:
Work early-stage preparations: fixedly mold, fixedly bed die fixes separately and opens, mobile bed die is placed on fixedly in the bed die, a left side drift, right drift, cutting somebody's hair in a left side and cuts somebody's hair in the right side stays in the appropriate location through control system, has been pre-charged with polyurethane rubber in the pipe;
Matched moulds: pipe is put into the counterdie mold cavity, mobile mold matched moulds and the fixing descending matched moulds of mold;
Upsetting, it is compound to expand: mobile mold, mobile bed die is held tubing tightly, cut somebody's hair and promote mobile mold and mobile bed die moves ahead in the right side, realize jumping-up and feed supplement, cut somebody's hair to move ahead and prop up the tubing left end in a left side simultaneously, namely gather " clout " in the district that is shaped, left drift meanwhile, right drift moves ahead, the extruding polyurethane rubber, district's pipe bulging is shaped under the effect of pressure, jumping-up feed supplement amount and tube bulge amount are carried out synchronously, load path is optimized, finishes the non-attenuate of preformed member wall thickness, at this moment the most of zone except knuckle has been formed in the preliminarily forming of realizing part under the supporting role of inner polyurethane rubber;
Bulging: after preliminarily forming is finished, left side drift, right drift stop to advance arrival moisturizing position, by left and right drift the moisturizing exhaust is carried out in tubing inside, by arriving default after the moisturizing time, the distance that left side drift, the right drift system of moving on set, reach the sealing position, tubing inside was full of liquid medium and realized sealing simultaneously this moment, in pipe, inject highly pressurised liquid by the aperture on the plunger rod of the left and right sides, liquid is by the rubber groove, enter quick filling inside pipe wall, make knuckle fit mould fully and be configured as needed workpiece.
CN201310204987.4A 2013-05-28 2013-05-28 Upset-bulge compound internal high pressure forming method and device for long and thin deformed straight pipe CN103272879B (en)

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Publication number Priority date Publication date Assignee Title
CN103691796A (en) * 2013-12-31 2014-04-02 一重集团大连设计研究院有限公司 Large internal high-pressure forming die
CN103862695A (en) * 2014-04-08 2014-06-18 北京林业大学 Plunger biomass forming machine material forming mould
CN104014993A (en) * 2014-05-29 2014-09-03 河北宏润重工股份有限公司 Nuclear main pipeline manufacturing method
CN104785604A (en) * 2015-04-14 2015-07-22 桂林电子科技大学 Metal thin wall double-layered tube impact hydro-bugling method and device
TWI636837B (en) * 2017-03-31 2018-10-01 國立虎尾科技大學 Manufacture process for high expansion ratio of hydroforming tube
CN109821956A (en) * 2018-08-30 2019-05-31 浙江志伯电器科技有限公司 A kind of manufacturing method of shaver shell

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691796A (en) * 2013-12-31 2014-04-02 一重集团大连设计研究院有限公司 Large internal high-pressure forming die
CN103862695A (en) * 2014-04-08 2014-06-18 北京林业大学 Plunger biomass forming machine material forming mould
CN103862695B (en) * 2014-04-08 2016-02-24 北京林业大学 Plunger type biomass forming machine material forming mould
CN104014993A (en) * 2014-05-29 2014-09-03 河北宏润重工股份有限公司 Nuclear main pipeline manufacturing method
CN104785604A (en) * 2015-04-14 2015-07-22 桂林电子科技大学 Metal thin wall double-layered tube impact hydro-bugling method and device
CN104785604B (en) * 2015-04-14 2016-10-19 桂林电子科技大学 Metal thin-wall bimetallic tube impact hydraulic expansion method and device
TWI636837B (en) * 2017-03-31 2018-10-01 國立虎尾科技大學 Manufacture process for high expansion ratio of hydroforming tube
CN109821956A (en) * 2018-08-30 2019-05-31 浙江志伯电器科技有限公司 A kind of manufacturing method of shaver shell

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