CN1074950C - Hydraulic stretching apparatus of pressing machine for stretching thin plate formed products - Google Patents
Hydraulic stretching apparatus of pressing machine for stretching thin plate formed products Download PDFInfo
- Publication number
- CN1074950C CN1074950C CN95102566A CN95102566A CN1074950C CN 1074950 C CN1074950 C CN 1074950C CN 95102566 A CN95102566 A CN 95102566A CN 95102566 A CN95102566 A CN 95102566A CN 1074950 C CN1074950 C CN 1074950C
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- CN
- China
- Prior art keywords
- stretching
- hydraulic
- tensioning device
- drift
- press
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000000418 atomic force spectrum Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 230000005484 gravity Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000002650 habitual effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000012857 repacking Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001739 rebound effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- 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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
- B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A die cushion plate (11) is fitted below the sheet metal retaining plate (10) and has several short stroke cylinders (13) in multi-point drive corresponding to the drawing die geometry. The press is double-acting, and the rammer (3) can move backwards shortly before contact with the workpiece (19) and is force and form locked to the press body (7) with a gap of 0.5 - 5 mm.
Description
The hydraulic deep-drawing that the present invention relates to a kind of forcing press of the sheet forming spare that stretches is stretched device.
In thin plate deep drawn processing and forming, adopt programme controlled hydroelastic system multiple spot deep drawn pad more and more.The main purpose of all this hydroelastic system deep drawn pads is to eliminate some adverse influence factors, for example: the mechanical wear of slider tilt or stretching bar, these factors will cause one-level and secondary wrinkle at the edge of deep drawing part or failure conditions such as crack occur.
Deutsche Bundespatent prospectus DE-OS4122128 about hydroelastic system deep drawn device, wherein with the programme-control for computer numerical control (CNC) of the short stroke piston of plug-in type stretching bar, merges in some power active regions according to the geometry of workpiece.But, in the programme-control of the deep drawn moulding of two holes wash bowl, do not illustrate where how several these power active regions should be divided into that along in the material flow limit scope of the circle profile that stretches, for example: be divided into " scrap (bridge) " compressive strain district.Because this manufacturability transition region indeterminate, also just lacked as the processing and forming prerequisite, be suitable for the stretch deep drawn Design of device bases of circle geometries, two holes.
All these new-type servo-hydraulic numerical control multiple spots stretch to fill up and more or less also have shortcoming certainly, be that mould must match with this stretching pad, that is to say, existing a large amount of habitual moulds in sheet forming processing, for example, be used to have the mould on two dynamic compressors of blankholder slide, perhaps be used for having the mould that stretches on the single action press of pad, as a rule, not carrying out the adaptability repacking at this new-type hydroelastic system multiple spot stretching pad just all can not use.On the other hand, fill up the rationalization effect of being brought owing to adopt this new-type hydroelastic system numerical control to stretch, competitiveness for sheet forming processing enterprise but produces such significant impact, make it must be converted to this new technology, in the most cases of deep drawn processing, the investment of existing mold sum is considerably beyond the investment of press, for example investment on single action deep drawn press.Because habitual mould is reequiped for new forming method and is needed to drop into very big fund, so the press design that new-type numerical control multiple spot stretching pad is housed has been proposed a new problem.
The object of the present invention is to provide a kind of press that hydroelastic system stretches and fills up that is equipped with, the existing mould of the deep drawn processing and forming that can will habitually practise in the past, need not expend very big adaptability repacking just can be used, and reach such purpose, that is, make these old-fashioned moulds can meet multiple spot new-type numerical control, that be divided into the power active region stretch pad requirement and use.
To achieve these goals, the invention provides the hydraulic tensioning device on a kind of press of thin plate deep drawn profiled member, but this press is equipped with the slide block and the top pressing board over against hydraulic cylinder by the mould supporting of a fixing and locking, also be equipped with one and can control the stretching nest plate that mobile stretching drift and is supported by hydraulic pressure along the deep drawn direction, some mechanical type stretching plunger rods at this nest plate upper support, these bars are to arrange with interior by stretching drift gabarit in the grid of workbench, the stretching plunger rod is connected in the stretching drift, the nest plate that wherein stretches by one or the control of several hydraulic controllers and on, move down.Its characteristics are:
A) a stretching backing plate that is placed in below the top pressing board is arranged, by the circle geometry (stretching drift profile) that stretches a large amount of short stroke oil cylinders is set in the plate, to carry out multiple spot control;
B) press is the double-acting structural shape, and the press top shoe is moved downward to almost and the workpiece position contacting, but keeps a clearance distance Δ n who is about 0.5～5mm, and lock slide block and press rack securely this moment;
C) each draw and the power active region of compressive strain scope in the short stroke oil cylinder, hydraulic starting crossing space Δ n, and is leaned workpiece on the stretching girth sheets;
D) the deep drawn deformation stroke (H) of stretching drift produces by driving the stretching nest plate by means of the stretching plunger rod.
Major advantage of the present invention is that the mould of habitual single action press needs loaded down with trivial details and expensive adaptability repacking, among the programme-control deep drawn processing that just can be applicable to regulate and control by the multiple spot power of numerical control.System according to the present invention also has following superiority:
---the general habitual hydraulic press that big gauging is housed of contrast, this habitual press is when bearing close retaining force (Schlie β haltekraft) and active force when deviation is arranged, because the compressibility of oil, the volume of oil presents a very big rebound effect, and be to carry out mechanical interlocking by the good mechanical pull bar of rigidity in the present invention, will produce a firm basically closed fixture system.
---the short stroke oil cylinder has only oil mass seldom, so even the force curve of having an effect changes (Kraftprofilanderung), the saltation of power (Kraftsprunge) also can be finished in several milliseconds.
---under defined terms, control (Echtzeitregelung) in real time can be carried out in stroke H without restriction, and is particularly also passable under very high shaping speed.
Further actual summary of the invention can be found out from explanation with reference to the accompanying drawings.Wherein accompanying drawing is:
Fig. 1 is the front view with press of stretching device of the present invention.
Fig. 2 is the cutaway view in " Z " zone among Fig. 1.
Fig. 3 is the vertical view of stretching device among Fig. 1.
Fig. 4 is power-trip map.
The stretching device of the present invention of in Fig. 1 to Fig. 4, having represented press 1, operating position when closure is represented on the left side, and the right is represented deep drawn and is crossed the operating position of Cheng Qian.This moment, press 1 was born the function of closed fixture and device for clamping mould.That is to say, the function of closed oil cylinder 2 is along with open and close motion vertical ground hydraulic pressure makes moving of slide block 3 and mold 4, when closing position, pass through at least 2 pull bars 5, preferably 4 pull bars 5 bear the static deformation power that is produced in the deep drawn deformation process, for this reason, when following closing position, pull bar 5 should be by hydraulic locking among mechanical locking device so that below press rack workbench 7 and above slide block 3 between the deformation force that produced can be absorbed.
Fig. 2 is the enlarged drawing in " Z " district among Fig. 1, and it is analysed and observe along " A-A " among Fig. 3.Mold 4 is to fixedly connected by habitual structural shape with the circle 8 that stretches, and lower mold half then is made up of following function element:
---stretching drift 9
---top pressing board 10
---multiple spot stretching backing plate 11 reaches
---the hydraulic control plate 12 of short stroke oil cylinder 13.
These short stroke oil cylinders 13 be merge in each multiple spot stressed draw or the Zhu Li active region 25 of molded scope in (referring to Fig. 3).Each power active region 25 is controlled by hydraulic control plate 12 respectively.Express the example of workbench 15 and hydraulic tensioning pad 11 in Fig. 3, there is Z1 the power active region that the pad that stretches is divided, Z2, D2, D1.2, D1.3 and D1.4.In narrow grid regions, short stroke oil cylinder 13 is round the two stretching circle geometries (Ziehringgeometrie) of cheating wash bowl profiles (Doppelspulenkontur) according to this example.Workbench 15 at first clamps on the table top in central authorities and is provided with stretching plunger rod eyelet 16.According to the geometry of stretching drift 9, correspondingly insert many stretching plunger rods 17, these plunger rods are supported on again on the stretching nest plate 18.
The course of work of deep drawn processing is as follows:
When press 1 is opened, above the stretching drift 9 that level and smooth workpiece plate 19 is placed on top pressing board 10 and lowers in advance, then in closure moves fast, slide block 3 is dropped near above the workpiece 19 with hydraulic pressure or mechanical system, but leave the little clearance delta n of about 0.5～5mm, and the stretching bar 5 by hydraulic machinery and locking element 6 couple together slide block 3 and following workbench 7.This function has two advantages:
Because closed oil cylinder 2 is different from the huge close mechanism of investment of press commonly used, need only move the weight of itself.In the hydraulic structure pattern, only need very a spot of oil.At this moment, just do not need the hydro-mechanical unit of the closed bed knife of bearing of a kind of significant investment (Znhaltekraft) just not to need, and be essential in customary way, so can carry out closed very fast and moving of opening.Thereby this cover system, particularly with respect to the crankshaft press of the closed frequency of height (Schlie β hubfrequenzen), can producing cheaply, press comes.Because slide block 3 is locked when Δ n gap, in the quick-make campaign, can not produce dynamic impulsion to workpiece plate 19, also just saved the wasting accelerator in advance (Vorbeschleunigungsprozeduren) of stretching backing plate commonly used.After slide block 3 and Working gantry 7 lockings, short stroke oil cylinder 13/ short stroke piston 21 will enter hydraulic, and top pressing board 10 will be by the hydraulic pressure clearance distance Δ n that raises, and like this, workpiece 19 is leaned on stretching girth sheets 8.If clearance delta n is crossed, the drift that then stretches will begin in a minute and crosses stroke H and move (see figure 4), and each power active region 25 will be controlled by the preprogram stress curve this moment.Stretching nest plate 8 will be by at least two, preferably four hydraulic controllers 23 controls and moving in the vertical direction, and two or four hydraulic controllers 23 all are controlled among parallel the moving, and nest plate 18 tilts to prevent to stretch.Can measure the parallel deviation of stretching nest plate 18 by stroke sensor 20.Can pre-determine the stress curve (see figure 4) by journey inqiuiry (Wegabfragung) equally.In the deep drawn stroke on stroke H, since draw with the compressive strain scope in have different materials to flow (for example in the compressive strain scope, because the material concentrated area flows to together, can cause material to thicken) and can cause at flange periphery and thicken, this material thickens will be by detecting the displacement transducer 22 notifier processes computers of thickness deviation/S.In control in real time, have positive or negative deviation between stress curve (see figure 4) and the given curve, can satisfy the specification requirement that material flows by positive/negative correction then given curve.
Each draw and the compressive strain scope in stretching plunger rod 17 and short stroke piston 21 be directly to insert along the stretching circle geometry face of two holes wash bowl profile.Because narrow mesh spacing is the 150mm spacing from L=37.5mm to the maximum, stretching plunger rod diameter is to about 60mm from about 25mm.In critical material flow range, might reach high force density under the favourable situation.This central scrap (bridge) (Stegkontur) that is particularly suitable between two basin vaults (Beckenwolbung) is located, increase the oil cylinder number by the size that reduces mesh spacing and reduce short stroke oil cylinder 13, also can be with stress point with higher force density, and among the floral designs that are arranged in stretching girth sheets 8 on the geometry more accurately stretch circle profiles (filigranen Z i ehingkontur).So just the sensitive material flow range D1 in the scrap (bridge) district 24 might be subdivided into several power active region.By power active region 25 further is subdivided into three independent controlled field of loads again on deep drawn stroke H, thereby the number of power active region is increased to 10 from 8.Be good like this,, can flow by material and build up material, thereby will cause critical bending transition (Knicksprung) because in the compressive strain scope, cheat the increase of the degree of depth along with basin.Along with the increase of the deep drawn degree of depth, can strengthen active force at corner area and prevent this bending transition.Because in compressive strain region D 1.2 and D1.4, because two inside lock districts are over against outer corner regions D1, the material accumulation can exceed about one times, so at D1.2, must flow to material by the active force that makes a distinction in D1.3 and the D1.4 zone and carry out independent control.
Claims (11)
1. the hydraulic tensioning device on the press of thin plate deep drawn profiled member, but this press is equipped with the slide block and the top pressing board over against hydraulic cylinder by the mould supporting of a fixing and locking, also be equipped with one and can control the stretching nest plate that mobile stretching drift is supported by hydraulic pressure along the deep drawn direction, some mechanical type stretching plunger rods at this nest plate upper support, these bars are to arrange with interior by stretching drift gabarit in the grid of workbench, the stretching plunger rod is connected in the stretching drift, wherein stretch nest plate by one or the control of several hydraulic controllers and on, move down, it is characterized in that
A) there is one to be placed in the following stretching backing plate (11) of top pressing board (10), by the circle geometry (stretching drift profile) that stretches a large amount of short stroke oil cylinders (13) is set in the plate, to carry out multiple spot control;
B) press is the double-acting structural shape, and press top shoe (3) is moved downward to almost and workpiece (19) position contacting, but keeps a clearance distance Δ n who is about 0.5～5mm, and lock slide block and press rack (7) securely this moment;
C) each draw and the power active region of compressive strain scope in short stroke oil cylinder (13), hydraulic starting crossing space Δ n, and is leaned workpiece (19) on stretching girth sheets (8);
D) the deep drawn deformation stroke (H) of stretching drift (9) produces by driving stretching nest plate (18) by means of stretching plunger rod (17).
2. hydraulic tensioning device as claimed in claim 1, it is characterized in that, deformation range is divided into two the power active regions that can control independently of one another (D1.2, D1.4 and D1.3) at least in scrap (bridge) zone (24), and hydraulic power (force) directly acts on the scrap (bridge) of stretching girth sheets (8).
3. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, the deformation force between upper block (3) and the following workbench (7) is absorbed by short pull bar (5).
4. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, workbench (15) is arranged some through holes (16) in the middle section that reclines with stretching drift (9), so that admit stretching plunger rod (17) by size of mesh opening commonly used.
5. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, stretching nest plate (18) at least will be by parallel the moving of two hydraulic controllers (23) control, to finish the deep drawn stroke H of stretching drift.
6. hydraulic tensioning device as claimed in claim 1 or 2, it is characterized in that, the parallel deviation of stretching nest plate (18) should detect by displacement transducer (20), and by each power active region the active force curve of short stroke oil cylinder (13) is predesignated in the process of deep drawn stroke H.
7. hydraulic tensioning device as claimed in claim 1 or 2, it is characterized in that, varied in thickness Δ S in the gap between top pressing board (10) and stretching girth sheets (8), at least to draw or the critical material flow range of compressive strain power active region, carrying out thickness with displacement transducer (22) detects, and with real-time control mode treatment technology, for example change active force curve or change drift speed change thickness in the process of stroke H.
8. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, on stretching nest plate (18) plural stretching drift (9) can be installed, even its position is in the outside of the hydraulic coupling center of gravity of hydraulic controller (23).
9. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, pull bar (5) tightens up at it should be consistent with mold height on length.
10. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, stretching backing plate (11) is arranged in below the stretching girth sheets (8) together with hydraulic control plate (12).
11. hydraulic tensioning device as claimed in claim 1 or 2 is characterized in that, short stroke oil cylinder (13) is to arrange that by being divided into square net mesh spacing L is from 37.5mm to 150mm, preferably gets 75mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4435069A DE4435069A1 (en) | 1994-09-30 | 1994-09-30 | Hydraulic deep drawing unit for presses |
| DEP4435069.4 | 1995-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1122267A CN1122267A (en) | 1996-05-15 |
| CN1074950C true CN1074950C (en) | 2001-11-21 |
Family
ID=6529678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95102566A Expired - Fee Related CN1074950C (en) | 1994-09-30 | 1995-09-28 | Hydraulic stretching apparatus of pressing machine for stretching thin plate formed products |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1074950C (en) |
| DE (2) | DE4435069A1 (en) |
| IT (1) | IT1277654B1 (en) |
| TW (1) | TW339291B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19511378B4 (en) * | 1995-03-28 | 2006-01-05 | Dieffenbacher Gmbh + Co. Kg | Hydraulic thermoforming device |
| DE19641411A1 (en) * | 1996-10-08 | 1998-04-09 | Dieffenbacher Gmbh Maschf | Hydraulic deep-drawing device |
| EP1593443A1 (en) * | 2004-05-07 | 2005-11-09 | Walter, Neff GmbH | Forming press |
| MX358381B (en) * | 2010-08-16 | 2018-08-15 | Schuler Pressen Gmbh Star | Drawing press with a static blank holder. |
| CN104454783A (en) * | 2014-12-24 | 2015-03-25 | 济南二机床集团有限公司 | Single-top-crown and single-main-cylinder pure-air type stretching pad structure of press machine |
| CN109646873A (en) * | 2018-12-21 | 2019-04-19 | 傲力健康科技(天津)有限公司 | Dumbbell and disc made from a kind of stone roller bell class fitness equipment preparation method and this method |
| CN109865762B (en) * | 2019-03-28 | 2020-02-14 | 燕山大学 | Plate performance detection device and use method |
| CN109848275A (en) * | 2019-04-09 | 2019-06-07 | 马鞍山瑞恒精密制造有限公司 | The stretching of metal iron-clad, punching automation process units |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6096332A (en) * | 1983-10-28 | 1985-05-29 | Aida Eng Ltd | Drawing die for press machine |
| JPS6096331A (en) * | 1983-10-28 | 1985-05-29 | Aida Eng Ltd | Drawing die for press machine |
| EP0173184A1 (en) * | 1984-08-24 | 1986-03-05 | August Läpple GmbH & Co. | Power press, particularly for use in drawing and deep-drawing operations |
| CN2073779U (en) * | 1990-09-07 | 1991-03-27 | 临海市东方发动机部件厂 | Tensile hydraulic press |
| CN1056641A (en) * | 1989-11-29 | 1991-12-04 | 图形科技有限公司 | The apparatus and method of hydroforming sheet metal |
| DE4122128A1 (en) * | 1991-07-04 | 1993-01-07 | Dieffenbacher Gmbh Maschf | Hydro-elastic deep drawing of sheet metal workpieces - uses system which automatically actuates punch mounted in baseplate, with metal blank being gripped between hold-down plates |
-
1994
- 1994-09-30 DE DE4435069A patent/DE4435069A1/en not_active Withdrawn
-
1995
- 1995-03-28 DE DE19511379A patent/DE19511379A1/en not_active Ceased
- 1995-09-26 IT IT95MI001978A patent/IT1277654B1/en active IP Right Grant
- 1995-09-28 CN CN95102566A patent/CN1074950C/en not_active Expired - Fee Related
- 1995-12-13 TW TW084113287A patent/TW339291B/en active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6096332A (en) * | 1983-10-28 | 1985-05-29 | Aida Eng Ltd | Drawing die for press machine |
| JPS6096331A (en) * | 1983-10-28 | 1985-05-29 | Aida Eng Ltd | Drawing die for press machine |
| EP0173184A1 (en) * | 1984-08-24 | 1986-03-05 | August Läpple GmbH & Co. | Power press, particularly for use in drawing and deep-drawing operations |
| CN1056641A (en) * | 1989-11-29 | 1991-12-04 | 图形科技有限公司 | The apparatus and method of hydroforming sheet metal |
| CN2073779U (en) * | 1990-09-07 | 1991-03-27 | 临海市东方发动机部件厂 | Tensile hydraulic press |
| DE4122128A1 (en) * | 1991-07-04 | 1993-01-07 | Dieffenbacher Gmbh Maschf | Hydro-elastic deep drawing of sheet metal workpieces - uses system which automatically actuates punch mounted in baseplate, with metal blank being gripped between hold-down plates |
Also Published As
| Publication number | Publication date |
|---|---|
| TW339291B (en) | 1998-09-01 |
| CN1122267A (en) | 1996-05-15 |
| DE4435069A1 (en) | 1996-04-04 |
| ITMI951978A1 (en) | 1997-03-26 |
| DE19511379A1 (en) | 1996-10-02 |
| ITMI951978A0 (en) | 1995-09-26 |
| IT1277654B1 (en) | 1997-11-11 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |