EP0916421B1 - Usinage d'une tôle sans enlévement de matiére, par écrasement - Google Patents

Usinage d'une tôle sans enlévement de matiére, par écrasement Download PDF

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Publication number
EP0916421B1
EP0916421B1 EP98120548A EP98120548A EP0916421B1 EP 0916421 B1 EP0916421 B1 EP 0916421B1 EP 98120548 A EP98120548 A EP 98120548A EP 98120548 A EP98120548 A EP 98120548A EP 0916421 B1 EP0916421 B1 EP 0916421B1
Authority
EP
European Patent Office
Prior art keywords
sheet
plate
counter
bearing surface
section
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 - Lifetime
Application number
EP98120548A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0916421A1 (fr
Inventor
Daniel Laurent
Giancarlo Pegoraro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Conception et Developpement Michelin SA
Original Assignee
Conception et Developpement Michelin SA
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Conception et Developpement Michelin SA filed Critical Conception et Developpement Michelin SA
Publication of EP0916421A1 publication Critical patent/EP0916421A1/fr
Application granted granted Critical
Publication of EP0916421B1 publication Critical patent/EP0916421B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets

Definitions

  • the present invention relates to the machining of sheets, or alternatively of plates (assimilated to sheets in the context of the present invention) in order to modify the geometry of the faces of said sheets.
  • a method according to the preamble of claim 1 is known of document FR-A-1 217 035.
  • the raw sheets are conventionally obtained by rolling.
  • An operation of rolling results in a difference in sheet speed between upstream and downstream of the rolling operation, which results in an increase in the length of the sheet after rolling.
  • the product obtained is generally with parallel faces.
  • the objective of the present invention is to modify the geometry of the faces of a raw sheet, to so as to obtain sheets whose faces are not parallel.
  • a special case consists in obtaining sheets with flat faces but not parallel.
  • biasing sheets that is to say sheets whose faces form inclined planes one by relative to the other, from angles as small as you want to angles worth a few degrees.
  • a so-called blank is produced. "Bias”, in which it is then possible to cut, by any technique, an object with a predefined contour depending on the intended end application.
  • the machining device shown in Figures 1 to 4 includes a frame 11 supporting a press 16 comprising a blade 162 movable relative to the frame 11 and a counter blade 161 immobile by relative to the frame 11.
  • the blade 162 is substantially elongated and is provided with a bearing having a large dimension and a small dimension.
  • Blade and counter blade 161 and 162 are mounted in look at each other. Blades and counterblades 161 and 162 leave a predetermined clearance between them and rigorously controlled constituting an orifice 1 receiving the sheet 2.
  • the device comprises means for moving the sheet relative to the blade and counter blade 161 and 162. In the first variant, it is a clamp 15 which can grip the sheet 2.
  • the device further comprises means to move said clamp 15 (therefore the sheet 2) relative to said blade and counter blade 161 and 162, in successive steps, laterally with respect to the large dimension of the blade 162.
  • the clamp in its movement away from the blade and counter blade 161 and 162, the clamp does not will not stray too far from a plane perpendicular to the plane of the orifice 1, passing through the said orifice.
  • the sheet 2 is crushed located under a span 165 of width W (see FIG. 3), each crushing occurring in offset from the previous one, by preferably with overlapping of the parts subject to crushing.
  • Said scope is for example plane.
  • the sheet will generally bear the footprints successive, by spaced traces of the length P of said pitch (see FIG. 3), P being smaller than W (W being the small dimension of the span 165). We proceed by successive crushing of the sheet 2 by acting perpendicular to the plane of the sheet 2.
  • the frame 11 is pierced in the center of a window 101 extended on one side by a clearance 102, receiving press 16 (see Figure 2).
  • the counter blade 161 is mounted on a fixed blade holder 13, and the blade 162 is mounted on a movable blade holder 14, by means of trapezoidal keys 131 and 132 respectively (see more particularly Figure 4).
  • the back 130 of the fixed blade holder 13 is a circular base cylinder, i.e. forms an arc of a very large radius when viewed in the plane of FIG. 1, in order to be able to adjust the parallelism of the blade and counter blade 161 and 162 by moving the fixed blade holder 13 transversely relative to the frame 11.
  • a corner 181 is interposed between the movable blade holder 14 and a reference surface 17 on the frame 11, with interposition of needle roller tracks 185.
  • This corner 181 is mounted on a nut 183, itself mounted on a screw 180.
  • the translation of the screw 180 along its axis is blocked by suitable arrangement.
  • the translation of the movable blade holder 14 takes place while it remains always parallel to itself, the forces exerted by the mobile tool holder 14 in the direction parallel to the axis of the screw 180 are taken up by the frame 11.
  • the movable blade holder 14 and all of the members cooperating therewith are held in place against the frame 11 by a plate 160.
  • the corner 181 forms an angle ⁇ whose value is chosen to develop an effort on the sheet sufficient to deform it, while providing the possibility that the length of movement of the corner is sufficient to control with relative precision the relative movement of the blade and counter blade.
  • the screw 180 is driven by a motor 186.
  • the rotation of the screw 180 in one direction allows move the corner 181 in one direction (for example from left to right in Figure 1); the rotation of the shaft 180 in the other direction makes it possible to move the corner 181 in the other direction. Given the direction of assembly of corner 181, a displacement of corner 181 from left to right in FIG.
  • the blade 162 and counter blade 161 are similar and have a profile symmetrical with respect to their large dimension.
  • Appropriate surface treatment allows give said range 165 a suitable hardness.
  • carbide tipped blades tungsten having undergone a surface treatment based on titanium nitride and bisulphide molybdenum have adequate strength and sliding (coefficient of friction), associated with lubrication.
  • Hoses 19 make it possible to spray a lubricant, for example machining oil, to cover the faces of the sheet just in front of the hole.
  • a lubricant for example machining oil
  • a clamp 15, with a self-tightening jaw, is arranged in parallel with the jaw 16.
  • This clamp includes clamping wedges 151 of trapezoidal section interposed between the object to be clamped (here the sheet 2) and support surfaces 150 inclined so as to converge on the side of the jaw 16.
  • the clamp 15 makes it possible to grip sheet 2 firmly by one of its ends.
  • the clamp must of course be able to close to grip sheet 2 correctly and open to drop sheet 2.
  • the necessary constructive details will be easily drawn by the skilled person and will not appear not on the drawing so as not to overload it unnecessarily.
  • a traction mechanism (not shown) allows to move away (or to move closer to make the sheet reverse from two passes) the clamp 15 of the jaw 16, clamp and jaw remaining constantly parallel, the movement of the clamp intervening in a plane perpendicular to the plane in which the movement develops blades and counter blade 161 and 162 of the jaw 16.
  • a pliers can be used hydraulic tightening.
  • the device also comprises means for stopping the movement of the movable blade 162 towards the counter blade 161 so as to leave a clearance of predetermined value between the blade and the counter blade as a function of the pitch considered and of the means for controlling the displacement by pitch of the sheet and the displacement of the movable blade 162 towards the counter blade 161 in successive and alternating sequences, each of the sequences varying said predetermined play value from one step to the next step.
  • this is obtained by judicious control of the motor 186 and of the means of displacement of the clamp 15.
  • the variation of the value of the play between blade and against blade is constant for a linear variation of the step value.
  • the sequences are the following: relative approximation of the blade and counter blade 161 and 162 to a first value clearance J, relative spacing of the blade and counter blade 161 and 162, movement of the clamp 15 towards the left ( Figures 2 and 4) with a step P, relative approximation of the blade and counter blade 161 and 162 up to a second value of the set J slightly lower than the first, and so on.
  • the predetermined value of the clearance can vary from one step to the next. according to any law.
  • FIG. 5 A second variant is described below by referring to Figures 5 to 8.
  • the counter blade is an anvil 262 which supports the sheet 2 to be machined.
  • Lateral stops 251 limit the descent of the movable plate towards the anvil 262.
  • Said means for controlling the displacement by steps of the sheet metal comprising means for move the anvil laterally with respect to the large dimension of the blade: anvil 262 can slide on the frame 21 of the press, in a direction understood substantially perpendicular to the plane described by the moving blade 261.
  • the range 265 of the blade 261, coming into contact with the sheet 2, is of very small width (FIGS. 6 and 7) and of length corresponding to the width of the sheet to machine ( Figure 5).
  • the anvil 262 is driven by a motor 264 acting on a screw 263.
  • the anvil forms or supports a wedge wedge with angle ⁇ , said angle ⁇ being identical to the angle of bias that we want to give to the sheet 2.
  • the value of the angle ⁇ is exaggerated on the drawings, to better highlight this characteristic of the invention.
  • the anvil 262 is, at each step, when the blade 261 is raised, moved transversely to the blade 261 (from right to left in Figures 6 to 8). We start from the end of the sheet to which we want to give the minimum thickness (left side in Figures 6 to 8). The sheet is crushed between the blade 261 and the anvil 262 by lowering the blade 261 until the press meets the stops 251. Gradually, the blade 261 is raised, having each time advanced the sheet of a pitch P slightly less than the width W of the bearing surface 265 of the blade 261, then repeat the crash.
  • the trace of successive steps on the surface of the sheet is more dimmed than in the previous variant, because the descent of the blade 161 is stopped each time at the same level, the bias coming from the inclination ⁇ of the receiving surface of the sheet 2 on the anvil 262 with respect to the guide surface 210 of the anvil 262 on the frame 21.
  • the crush varies in importance, for example it gradually decreases when the anvil moves from right to left in Figures 6, 7 and 8.
  • the rate of deformation of the sheet does not exceed certain limits. It depends on the nature of the material. Also take into account the angle of bias and the length machined. In fact, taking into account the fact that the total volume of material is preserved, the parameter to take into account is the quantity of material displaced by machining. The more there are, the bigger will be the number of passes required. From one pass to another, the crushing continues. So, for example, for ductile stainless steel, if one wishes to achieve a bias angle reaching the order of size of 0.1 °, and for a machined length of the order of 10 centimeters, it is preferable to work in at least two successive passes. So, with each pass, we implement a law targeting different thickness values.
  • the invention allows machining without thermal input.
  • the invention allows machining while having constant deformation rates throughout the worked section.
  • the resulting benefit is the absence or at least the very low impact of parasitic deformations, hence no or very little warping of the sheet after machining.
  • the proposed machining process fits easily into a more complex installation manufacturing drafts according to a particular application.
  • a metal strip continuous whose width and thickness are chosen according to the width and thickness maximum of the blank bias to manufacture.
  • the strip for example packaged in the form of coil, is cut into pieces which feed a machining device as described. Yes several passes are required, then the anvil includes a means for adjusting the angle ⁇ and the anvil backs up between two passes, or two are used one after the other devices in which the angle ⁇ of the anvil is different. During successive passes, the faces of the sheet remain flat, their relative inclination increasing.
  • the deformation machining as proposed allows a great saving of material compared to material removal machining.
  • the type of material depends on the intended application, the process suitable for all sufficiently ductile materials.
  • the invention finds a particularly interesting application for machining thick steel sheets between 0.5 millimeter and 3 millimeters.
  • the invention advantageously applies to the manufacture of a type of tire tread mold. If we refer to the description of a mold for tire given in patent application EP 0 569 909, it can be seen that said mold is consisting of the stacking in the circumferential direction of a large number of elements, the section, seen in a plane perpendicular to the axis of the mold, is preferably trapezoidal.
  • the invention provides a method which makes it possible to obtain a blank suitable for cutting said blanks. elements.
  • Said elements are then cut to the desired profile so that, on the side of the most thin, part of the wafer is a molding zone of a corresponding wafer of the tread, and so that outside of said molding zone, the additional wafer in the part cited above cooperates with members controlling the opening movements and closing the mold.
  • the steel thus machined is stainless steel, due to the use of the blanks in a mold for tire.
  • blanks are mass produced by applying the process described above, then we chain the production by cutting, according to the desired profile, as and as one or more elements in each blank, and stacking as and when said elements to constitute said mold.
  • the cutting of the profile 32 will typically be different for each of the elements 31, according to the shape of the sculpture of the tread to be molded.
  • the invention lends itself perfectly well to computer-aided manufacturing. From computer files containing the definition of the sculpture, you can order a cutting cutting of preforms, for example a laser cutting machine. The invention allows therefore the production of molds of the type described in patent application EP 0 569 909 according to a very direct method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP98120548A 1997-11-13 1998-10-30 Usinage d'une tôle sans enlévement de matiére, par écrasement Expired - Lifetime EP0916421B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9714344 1997-11-13
FR9714344A FR2770792A1 (fr) 1997-11-13 1997-11-13 Usinage d'une tole sans enlevement de matiere par ecrasement

Publications (2)

Publication Number Publication Date
EP0916421A1 EP0916421A1 (fr) 1999-05-19
EP0916421B1 true EP0916421B1 (fr) 2002-04-17

Family

ID=9513412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120548A Expired - Lifetime EP0916421B1 (fr) 1997-11-13 1998-10-30 Usinage d'une tôle sans enlévement de matiére, par écrasement

Country Status (6)

Country Link
US (1) US6058757A (ja)
EP (1) EP0916421B1 (ja)
JP (1) JPH11319975A (ja)
BR (1) BR9804604A (ja)
DE (1) DE69804923T2 (ja)
FR (1) FR2770792A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2259588B1 (en) 1996-02-28 2013-12-11 Panasonic Corporation High-resolution optical disk for recording stereoscopic video, optical disk reproducing device and optical disk recording device
FR2832091A1 (fr) * 2001-11-13 2003-05-16 Michelin Soc Tech Moule pour pneus
FR2839003A1 (fr) 2002-04-29 2003-10-31 Michelin Soc Tech Moule pour pneus

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR718044A (fr) * 1931-06-02 1932-01-18 Bleiindustrie Ag Vormals Jung Presse à refoulement pour la fabrication des tôles
US2148469A (en) * 1936-07-06 1939-02-28 American Rolling Mill Co Process and device for reducing sheet metal
US2224337A (en) * 1937-03-30 1940-12-10 Akron Standard Mold Co Method of making tire molds
FR991116A (fr) * 1949-07-22 1951-10-01 Procédé et appareillage pour l'obtention de tôles et de bandes par allongement en matrice
US2935114A (en) * 1955-02-08 1960-05-03 Anderson Frohman Work gripping and drawing mechanism for sheet shaping machines operating on the forming-by-drawing principle
US3049035A (en) * 1957-11-13 1962-08-14 Ici Ltd Apparatus for the reduction of metals or alloys
US3495427A (en) * 1965-04-05 1970-02-17 Cavitron Corp Apparatus for altering the cross-sectional shape of a plastically deformable workpiece using high frequency vibrations
US3514989A (en) * 1967-10-04 1970-06-02 Foxboro Co Method for die forming flexures using edge constraint
US3768296A (en) * 1972-09-13 1973-10-30 Wean United Inc Method and apparatus for pressing and indenting a workpiece
US3921429A (en) * 1974-04-11 1975-11-25 Tadeusz Sendzimir Process and apparatus for modifying the cross section of a slab
FR2515541B1 (ja) * 1981-10-30 1985-05-10 Griset Ets
US5086635A (en) * 1990-12-10 1992-02-11 Chu Associates, Inc. Method of and machine for forming compound curvatures in metal sheets by drawing
US5156036A (en) * 1991-08-19 1992-10-20 Ulrich Copper, Inc. Method and apparatus for drawing open-sided channel members
JPH05293571A (ja) * 1992-04-22 1993-11-09 Ishikawajima Harima Heavy Ind Co Ltd プレス製造装置
ES2083223T3 (es) * 1992-05-13 1996-04-01 Sedepro Molde para neumatico, y procedimiento de moldeo del neumatico.

Also Published As

Publication number Publication date
JPH11319975A (ja) 1999-11-24
BR9804604A (pt) 1999-11-16
US6058757A (en) 2000-05-09
DE69804923T2 (de) 2002-10-31
EP0916421A1 (fr) 1999-05-19
FR2770792A1 (fr) 1999-05-14
DE69804923D1 (de) 2002-05-23

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