EP1173298A1 - Procede et outils d'emboutissage, applications notamment a l'emboutissage de banquettes, et articles emboutis, notamment banquettes ainsi obtenues - Google Patents
Procede et outils d'emboutissage, applications notamment a l'emboutissage de banquettes, et articles emboutis, notamment banquettes ainsi obtenuesInfo
- Publication number
- EP1173298A1 EP1173298A1 EP00920819A EP00920819A EP1173298A1 EP 1173298 A1 EP1173298 A1 EP 1173298A1 EP 00920819 A EP00920819 A EP 00920819A EP 00920819 A EP00920819 A EP 00920819A EP 1173298 A1 EP1173298 A1 EP 1173298A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- punch
- sheet
- blank holder
- blank
- stamping method
- 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.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C5/00—Chairs of special materials
- A47C5/04—Metal chairs, e.g. tubular
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
Definitions
- stamping process and tools applications in particular for stamping benches, and stamped articles, especially benches thus obtained.
- the present invention relates to the technical sector of sheet metal stamping, and to the products thus obtained.
- stamping is an operation which consists in transforming a sheet into an article or product having a certain precise shape or geometry, by means of a press.
- the sheet metal to be stamped T is placed above a punch 4, held between a blank holder composed of two parts of symmetrical blank holders 3, (hereinafter for the sake of clarity "Two blank clamps") front AV and rear AR, (AV and AR designating, as shown in the attached drawing, the direction of travel of the sheet - the sheet moving from the "AV" part which marks its entry under the press towards the “AR” part which marks the exit of the sheet from under the press, and each press or tool element will be identified as well, cf.
- Such marks are difficult to accept on a finished product, in particular on a finished product which is not intended to undergo an additional step of depositing a protective or decorative coating, or the like.
- stainless steel is known to be even more difficult to stamp than steel. It therefore requires a more powerful tightening, with therefore an even greater risk of marking.
- stainless steel naturally represents a material of choice for a large number of facilities, including benches for travelers or waiting rooms in general.
- the problem solved by the invention is therefore to eliminate the tightening marks and the crimps or folds of deformation, when stamping sheets according to a punch geometry "marked" relative to the initial plane of the sheet.
- Such benches are shown schematically in Figure 2 attached. It can be seen that the sheet metal T has been stamped so as to reveal hollow shapes or imprints of the seat 11, 12, etc. separated by an interval i.
- the sheet metal T has been stamped so as to reveal hollow shapes or imprints of the seat 11, 12, etc. separated by an interval i.
- Such benches produced by stamping are much less expensive than molded plastic benches.
- the invention also allows stamping of plastic or composite material plates.
- the hollow shapes are progressive and all the shapes of the bench must be harmoniously curved for the comfort of the seat, as shown in Figure 3 attached. These shapes are obtained, of course, by the precise geometry 5 of the punch 4 and of the corresponding tool 10.
- the interval i is defined more precisely in FIG. 3, and it can be seen that i represents the length of the plane section 117 separating the two holidays (or roundings) 115 and 116.
- interval i is too small, it occurs during the usual drawing processes, and on conventional tools, the tightening and deformation marks described above.
- a small interval i is precisely required in order to place a maximum of travelers over a minimum length.
- the length is determined by the gauge of the trains or trains. The interval i often required is such that it leads with the conventional tools to the aforementioned marks.
- the sheets T used are sheets which are preferably already covered with a coating before stamping, which is preferably final, and it will therefore not be possible in this case advantageous to remove these marks later.
- the object of the invention is to remedy these drawbacks.
- Figure 1 schematically shows a stamping press and the tools of the prior art
- FIG. 2 schematically represents the general shape of a stamped sheet metal bench representing a particular example of non-limiting application of the invention
- Figure 3 shows in section the schematic curve of the benches to be obtained
- FIG. 4 represents the general principle of the invention, in the form in lateral section of a set of punch and of front and rear blank clamps
- FIG. 5 represents the adaptation of the general principle of the invention according to FIG. 4 to the production by stamping of benches having a comfortable hollow seat, at small interval i, in the form of a left-right cross section (G - D) press and stamping tools;
- FIG. 6 is a perspective view of the profile of a set of front and rear blank clamps and of a punch adapted to the manufacture of multi-seat benches, in particular 6 seats.
- FIG. 7 shows in side section a nonlimiting example of application of the invention to a set of front and rear blank clamps and of a punch suitable for the manufacture of bench seats with several places, in particular 6 places.
- FIG. 8, made up of FIGS. 8 a (matrix) and 8 b (punch), represents in perspective a nonlimiting example of application of the invention to a set of front and rear blank clamps and of a punch suitable for manufacturing benches with several places, in particular 6 places, comprising, according to an advantageous variant, a set of matrix parts, rear blank holder and punch making it possible to modify the "pitch" of the stamping operation.
- FIG. 9 shows in side section the block diagram of a stamping press of the prior art, which can be used according to the invention subject to the appropriate tools.
- 600 represents the sliding machine
- 900 the die
- 700 the punch
- 950 the blank holder
- 800 the table (fixed)
- 980 the candles
- F1 and F2 indicating the known relative movements.
- the invention relates very generally to a stamping method according to which the rear blank clamp (AR) 20 is widened towards the rear and geometrically adapted to the level of the zone 14, that is to say preferably the zone adjacent to the punch, to reproduce at least part of the shape created by the punch 4 on its front part.
- AR rear blank clamp
- the AR hold-down can also preferably reproduce exactly half of the AV shape of the punch, or even more than half, and up to all, of the shape created by the punch, but the assembly would be unnecessarily expensive and costly. less easy handling in the successive step process which will be described below.
- the AV blank holder 30 may have a slightly curved surface or profile 8 favoring the deformation transition from the sheet to the punch. This may be of interest in certain applications.
- the rear blank holder AR 20 is widened towards the rear relative to the dimensions of the prior art and present on the end adjacent to the punch (i.e. the front end of the rear blank holder) a curved shape, that is to say a shape which allows a progressive deformation of the sheet in depth, and over a longer length of blank holder, instead of the right angle of the greenhouse blanks of the prior art.
- the front blank clamp (AV) 30 is also widened (forward) but does not require any adaptation of its geometry, that is to say that its surface 8 remains flat but is widened towards the front compared to the usual dimensions of the prior art.
- the Applicant considers that the adaptation of the rear blank holder to at least part of the geometry of the shape created by the punch in its front part makes it possible to make the tightening more progressive while distributing better the efforts of the press on the sheet, both in terms of surface than time.
- the sheet would therefore have more ability to adapt to forces, and would deform without developing tightening marks or creases or folds, even in the case of “marked” geometry forms as defined above.
- An important advantage of the invention in addition to the disappearance of the tightening marks and the folds or crimps, and which has been brought to light when it was not part of the technical problem initially posed, is that it is possible to reduce very strongly the pressure to be exerted by the press.
- the prior art uses a force of approximately 500 t while the invention is content to use 150 to 300 or 3501 for the same sheet .
- the geometric adaptation of the blank holder AR represents half of the shape created by the punch 4 in its front part.
- Figures 6 and 7 show non-limiting examples of the invention, suitable for the manufacture by stamping of seats with several places, especially two to six or more places.
- the blank holder AR 100 reproduces, according to this particular non-limiting embodiment, half of the seat shape created by the punch 120 in its front part.
- the blank holder 100 could reproduce only part of the seat shape of the punch, less than half.
- the blank holder AR could also reproduce more than half, and up to all, of the shape created by the punch, but the assembly would be unnecessarily expensive and less handling easy in the successive step process which will be described below.
- the blank holder AR and the punch 120 there is an area whose geometry is adapted to reproduce the desired shape of the interval i defined as having to exist between two successive seat shapes.
- the AV 110 blank holder has been widened forward as indicated above according to a non-mandatory option, but it can be seen that, in this example, its profile 8 remains horizontal.
- FIG. 7 shows the method according to the invention.
- the AR 100 blank holder reproduces in its part B half of the seat imprint, identical to the half form A of the punch 120 in its front part, the arrow indicating the direction of movement not -not from sheet metal.
- the tool comprises, between the blank holder AR 100 and the punch 120, a shoulder 150 which reproduces the interval i which must exist between two successive footprints.
- the half-impression curve of the AR 100 blank holder makes it possible to reduce the stresses undergone by the sheet (as well as the drawing pressure), the assembly making it possible to reduce the interval i to low values, of the order of 1 to 3 or 5 cm for sheets of 15/10 mm or even of 12/10 mm or even of 10/10, 8/10 or 6/10 mm, which was impossible in the prior art without marking and without creases or creases.
- the prior art that is to say with a tool as shown in FIG.
- the smallest interval i that could be achieved was 3 to 10 cm for a sheet of 15/10 mm and 5 to 12 cm for a 12/10 mm sheet, without being able to avoid the aforementioned drawbacks.
- the invention therefore makes it possible, for the same controlled interval i, to use a thinner sheet, which represents a significant saving in material.
- the invention also makes it possible, as we have seen, to reduce the interval.
- Another advantage lies in obtaining, according to the invention, soft curved shapes at the level of the gap, while in the prior art there is always a flat area at this location.
- the invention therefore allows a person skilled in the art to play on these two parameters, the interval and the thickness, in order to best adapt to the order of his client.
- part B represents a half shape
- the stamping process comprises a step of preforming the sheet, as shown in FIG. 5.
- the tool, punch 4 and die 10 is shown here as well as the sheet T in cross section.
- the sheet is preformed using a folding machine.
- the invention however makes it possible to use a simplified preform compared to that which was compulsory in the prior art.
- the sheet is preformed along the line a, b, c, rounded part d, e, f. All sections are straight except the curvature d.
- the invention also covers a first variant according to which the preform would be formed of sections a, b, c, d, g (right).
- the invention also covers a second variant according to which the preform would be formed of sections a, h (right), d, e, f.
- the invention also covers a third variant according to which the preform would be formed of sections a, h (right), d, g (right).
- the sheet is positioned (as in FIG. 7) without worrying about aligning it vertically with the punch and the die.
- the sheet may be offset for example by the distance m with respect to the vertical alignment.
- the press is then lowered slowly and the sheet is allowed to center itself on the tool.
- the invention also opens up the perspective, which was not part of the technical problem initially posed, and is therefore surprising, of modifying the "step" imposed by the tool.
- the pitch can be modified at will by designing the tool in two parts separated by a transverse cut (that is to say perpendicular to the direction of movement of the sheet), which forms the basic tool at the minimum pitch, then by deviating from the desired value E of modification of the pitch the two parts of the tool thus created by said cutout, and by inserting into the gap E an appropriate set of four removable parts, called a shim of matrix 460, of punch 480 and of blank holder 490 and 420.
- a transverse cut that is to say perpendicular to the direction of movement of the sheet
- the invention also covers the tool as described, suitable for the manufacture of multi-seat benches, in particular two to six or eight seats or more requiring several successive seat shapes or imprints 11, 12, separated by an interval i, characterized in that, so that the drawing pitch can be modified at will, the tool is designed in two parts separated by a transverse cut (i.e. perpendicular to the direction of travel of the sheet) at the center of the punch (4, 120), which forms the basic tool at minimum pitch, which can be separated from one the other by the desired value E of modification of the pitch and in that the tool comprises one or more sets of four removable parts, known as die block 460, of punch 480 and of blank holder 490 and 420, adapted to be inserted in gap E with appropriate clearance.
- a transverse cut i.e. perpendicular to the direction of travel of the sheet
- the tool comprises one or more sets of four removable parts, known as die block 460, of punch 480 and of blank holder 490 and 420, adapted to be inserted in gap E with
- the invention applies to the stamping of all parts similar to the example described, and in particular to any part having close repetitive fingerprints, but also to the stamping of thin sheet metal parts, even of non-shaped repetitive, where there are problems with marking and creases or creases.
- the invention makes it possible to stamp sheets of various usual thicknesses, using as has been said a very reduced press force, of the order of half of the usual force in general, and to stamp sheets of various usual or stainless steels, or various usual alloys, carrying a temporary, provisional or permanent coating, or an undercoat of primer, or even making stampings of plastic or composite plates of all types.
- the press and the tool may be a heating press.
- the invention covers the drawing process which has just been described, as well as the corresponding tools and the corresponding preforms, and the articles and products thus obtained.
- the invention also covers the stamping process which has just been described, as well as the corresponding tools and the corresponding preforms, and the articles and products thus obtained, conventionally adapted by the skilled person to the stamping of products and articles of all forms compatible with the teaching of the present description.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9905220A FR2792558B1 (fr) | 1999-04-21 | 1999-04-21 | Procede et outils d'emboutissage, applications notamment a l'emboutissage de banquettes, et articles emboutis, notamment banquettes ainsi obtenues |
FR9905220 | 1999-04-21 | ||
PCT/FR2000/000995 WO2000064607A1 (fr) | 1999-04-21 | 2000-04-14 | Procede et outils d'emboutissage, applications notamment a l'emboutissage de banquettes, et articles emboutis, notamment banquettes ainsi obtenues |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1173298A1 true EP1173298A1 (fr) | 2002-01-23 |
EP1173298B1 EP1173298B1 (fr) | 2005-07-27 |
Family
ID=9544827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00920819A Expired - Lifetime EP1173298B1 (fr) | 1999-04-21 | 2000-04-14 | Procede et outils d'emboutissage et applications notamment a l'emboutissage de banquettes |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1173298B1 (fr) |
JP (1) | JP2002542038A (fr) |
KR (1) | KR20020012545A (fr) |
CN (1) | CN1255230C (fr) |
AU (1) | AU4125400A (fr) |
DE (1) | DE60021550D1 (fr) |
FR (1) | FR2792558B1 (fr) |
WO (1) | WO2000064607A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104154837B (zh) * | 2014-09-04 | 2017-08-18 | 中国工程物理研究院机械制造工艺研究所 | 一种基于标准心轴的四极杆组件装配装置 |
KR20200063194A (ko) * | 2017-10-06 | 2020-06-04 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | 예비성형 부품에 의해 성형된 판금 부품을 제조하는 방법 및 장치 |
CN115179042A (zh) * | 2022-08-29 | 2022-10-14 | 如皋市宏茂重型锻压有限公司 | 一种铸造盘的冲压锻件褶皱清除装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2339032A (en) * | 1941-06-25 | 1944-01-11 | Schlenxig Benhardt | Forming die |
JPS5897429A (ja) * | 1981-12-07 | 1983-06-09 | Nissan Motor Co Ltd | ドロ−用プレス金型 |
JPS5987925A (ja) * | 1982-11-12 | 1984-05-21 | Toyota Motor Corp | プレスによる絞り成形法 |
JPS60166127A (ja) * | 1984-02-10 | 1985-08-29 | Nissan Motor Co Ltd | パネルのプレス成形方法 |
JPS61103627A (ja) * | 1984-10-27 | 1986-05-22 | Toyota Motor Corp | 自動順送り型プレス成形方法 |
DE9420200U1 (de) * | 1994-12-07 | 1995-02-02 | Weiler, Nikolaus, 12055 Berlin | Formkörper für Sitzmöbel |
-
1999
- 1999-04-21 FR FR9905220A patent/FR2792558B1/fr not_active Expired - Fee Related
-
2000
- 2000-04-14 JP JP2000613590A patent/JP2002542038A/ja active Pending
- 2000-04-14 AU AU41254/00A patent/AU4125400A/en not_active Abandoned
- 2000-04-14 CN CNB008079900A patent/CN1255230C/zh not_active Expired - Fee Related
- 2000-04-14 KR KR1020017013447A patent/KR20020012545A/ko not_active Application Discontinuation
- 2000-04-14 DE DE60021550T patent/DE60021550D1/de not_active Expired - Lifetime
- 2000-04-14 EP EP00920819A patent/EP1173298B1/fr not_active Expired - Lifetime
- 2000-04-14 WO PCT/FR2000/000995 patent/WO2000064607A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0064607A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1173298B1 (fr) | 2005-07-27 |
KR20020012545A (ko) | 2002-02-16 |
FR2792558A1 (fr) | 2000-10-27 |
WO2000064607A1 (fr) | 2000-11-02 |
CN1255230C (zh) | 2006-05-10 |
CN1352580A (zh) | 2002-06-05 |
AU4125400A (en) | 2000-11-10 |
FR2792558B1 (fr) | 2002-01-18 |
DE60021550D1 (de) | 2005-09-01 |
JP2002542038A (ja) | 2002-12-10 |
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