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
  • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
  • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
• • 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
  • B21D22/02—Stamping using rigid devices or tools
  • B21D22/025—Stamping using rigid devices or tools for tubular articles
• • 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
  • B21D53/00—Making other particular articles
  • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

• the present invention relates to a tool and a machine for notching a tube, in particular a headrest armature tube for a motor vehicle.
• the invention applies in particular, but not limited to height-adjustable head restraints, the frame of which is composed of two parallel branches, at least one of which has a plurality of notches each defining a position for adjusting the support -head while fulfilling one of the following functions: anti-ejection in raised-maximum position, adjustment during travel, maximum low restraint.
• FIG. 1 Different profiles of such notches are shown diagrammatically in FIG. 1 and one of the end notches, with orthogonal profile, is drawn in detail in FIG. 2.
• these notches cooperate with latches integrated in guide sockets provided at the top of the seat back.
• these notches are easily produced whatever their profile, for example by machining, or by cold deformation (stamping).
• the headrest frames progressively pass from an execution in rod or wire towards an execution in tube for which problems of realization of the notches arise.
• the process of machining the notches remains applicable to the tubes by milling or broaching if the thickness of the tube allows it and if the weakening of section gives the product a rigidity and a resistance conforming to the rigidity requirements.
• the invention aims to overcome the aforementioned drawbacks and to propose a machine capable of producing several notches simultaneously in the wall of a tube, without restriction of shape.
• the invention provides a tool for notching a tube, in particular but not limited to the notching of one or two tubes of a head support frame for a motor vehicle, characterized in that it comprises the elements following: - a fixed lower matrix in the form of a half-shell, the internal cavity of which is capable of conforming to the semi-cylindrical external shape of a notched tube,
• a mandrel capable of being inserted inside the notching tube and capable of reserving in the internal cavity of the tube, one or more volumes, for the expansion of material resulting from the stamping.
• FIG. 1 schematic representation of a head support frame branch comprising a series of notches of different profiles
• FIG. 2 notch end with orthogonal profile
• Figure 3 schematic diagram of the innovative part of a machine according to the invention
• Figure 4 vertical section along AA in Figure 3.
• a machine consists essentially of a press on which is mounted at least one notching tool (1) specific to the invention and which comprises the following elements: - a fixed lower die, not shown and in the form of a half shell donHa- internal- cavity-is-suitable-for- marry- the outer-semi-cylindrical shape of a notched tube (2), a blank-type device of the spring type or actuated by separate cylinders, to ensure appropriate clamping of a tube (2) or two tubes simultaneously , at least one movable upper punch (3) whose end is shaped in a complementary shape (4) opposite to that of one of the notches (5) with realize, and able to move perpendicular to the longitudinal axis of the tube, a mandrel (6) able to be introduced inside the notching tube and the section of which has been provided to solve execution problems such as it will be explained later.
• the machine may include two notching tools (1) as described above.
• each notching tool can also be provided to comprise several aligned upper punches (3), each intended for producing one of the notches of the same branch (2) of the frame, and actuated simultaneously during a same stamping operation.
• the invention provides for using a mandrel whose section does not fill the entire internal cavity of the tube, so as to reserve one or more volumes for the expansion of material, and to be able to be extracted. of the tube after stamping.
• the cylindrical mandrel has a modified zone: the section of the mandrel (6) necessarily has on the one hand a planar zone (7) along a plane parallel to the longitudinal direction (10) of the mandrel and forming anvil function during stamping, and on the other hand two side blanks (8,9) -for-example- (but not necessarily) -disposed symmetrically with respect to the vertical median plane (11) of the mandrel to release on each side of the mandrel an expansion volume (12, 13).
• the two blanks are planar and determine between them a predetermined angle ( ⁇ ).
• the width (d) of the anvil and the predetermined angle ( ⁇ ) are calculated as a function of the dimensions of the tube and the notch to be obtained while guaranteeing the desired rigidity and safety.
• a machine according to the invention is a press comprising at least one notching tool and means for moving and positioning a mandrel in a notching tube, along its longitudinal axis, in one direction or the other.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Punching Or Piercing (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Forging (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=30011588

Family Applications (1)

Country Status (7)

Families Citing this family (7)

Citations (4)

• 2002
  • 2002-07-29 FR FR0209637A patent/FR2842752B1/fr not_active Expired - Fee Related
• 2003
  • 2003-07-11 AU AU2003264713A patent/AU2003264713A1/en not_active Abandoned
  • 2003-07-11 AT AT03787849T patent/ATE335557T1/de not_active IP Right Cessation
  • 2003-07-11 DE DE60307484T patent/DE60307484T2/de not_active Expired - Fee Related
  • 2003-07-11 ES ES03787849T patent/ES2270149T3/es not_active Expired - Lifetime
  • 2003-07-11 WO PCT/FR2003/002187 patent/WO2004016367A1/fr not_active Ceased
  • 2003-07-11 EP EP03787849A patent/EP1539393B1/de not_active Expired - Lifetime

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events