FR2976197A1 - Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position - Google Patents

Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position Download PDF

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Publication number
FR2976197A1
FR2976197A1 FR1155139A FR1155139A FR2976197A1 FR 2976197 A1 FR2976197 A1 FR 2976197A1 FR 1155139 A FR1155139 A FR 1155139A FR 1155139 A FR1155139 A FR 1155139A FR 2976197 A1 FR2976197 A1 FR 2976197A1
Authority
FR
France
Prior art keywords
presser
2a
position
undercut edge
end portion
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.)
Pending
Application number
FR1155139A
Other languages
French (fr)
Inventor
Jacky Fromentin
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles 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.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Priority to FR1155139A priority Critical patent/FR2976197A1/en
Publication of FR2976197A1 publication Critical patent/FR2976197A1/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00Flanging or other edge treatment, e.g. of tubes
    • B21D19/08Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/082Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles
    • B21D19/084Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles with linear cams, e.g. aerial cams

Abstract

The tool (1) has an upper moving element (5) comprising a main presser (7) to tighten a sheet part (2) on a support part (4) of a lower frame (3) in a lowered position of the moving element. A secondary presser (18) is pivotally mounted with respect to the main presser. The secondary presser pivots, via a slide (9) moving toward a forming position of an end portion (2b) of an undercut edge (2a) in the sheet part, to a position of tightening of the undercut edge on an inclined lower face (4b) of the support part, where the slide carries a blade-shaped punch (10).

Description

The present invention relates to a tool for forming an end portion of an undercut edge of an end-face forming part of an undercut edge of a sheet metal part. a piece of sheet metal. It applies in particular but without limitation to a sheet metal part of a body structure of a motor vehicle. JP 62-199231 discloses a forming tool for performing an undercut operation on an edge of a sheet metal part. This tooling comprises a lower frame having a support portion shaped to support the sheet metal part, a movable upper unit that can be lowered in a rectilinear direction with respect to the lower frame and comprising a main presser for gripping the sheet metal part on the support part in the lowered position of the moving equipment. The tooling further comprises a slider carrying a punch and controlled displacement on the lower frame at a position allowing the punch to stamp a free edge of the sheet metal part on a matrix 25 secured to the lower frame to form at least one against -deep on the edge of this room. The tooling is also provided with a ramp means supported by the upper movable element and cooperating with a ramp with the same inclination of the slider to control the movement of the latter to its forming position of the end edge of the piece. in sheet metal when the moving equipment is lowered to its position at which the main presser clamps the sheet metal part on the support part. This known tooling finally comprises a presser pivotally mounted relative to the main presser and cooperating with another rotary punch carried by the moving element so as to form on the matrix of the lower frame a remaining part of the edge of the sheet metal part when the moving equipment occupies its lowered position, the rotating presser and the rotary punch being actuated by the descent of the moving element by means of spring members mounted in the moving assembly. Such known tooling has the disadvantage of being of a relatively complex and expensive structure and is not at all adapted to allow clamping by the pivoting main presser of a sheet metal part already provided with a counter-shaped edge. stripping on a mating support portion of the lower frame. The present invention aims to overcome the above disadvantages of the known tooling. For this purpose, according to the invention, the tooling for forming an end portion of an undercut edge of a sheet metal part, comprising a lower frame having a support portion shaped to support the sheet metal part and its undercut edge, a movable upper unit which can be lowered in a rectilinear direction with respect to the lower frame and comprising a main presser adapted to clamp the sheet metal part on the support part in the lowered position of the movable assembly, a slider having a punch and a controlled displacement on the lower frame at a position permitting the punch to fold forming the end portion of the undercut edge on a lower conjugate counterpart of the support portion , and a means carried by the movable member for controlling the displacement of the slider at its forming position of the end portion of the undercut edge when the mobile unit is lowered to its position at which the main presser clamps the sheet metal part on the support part, is characterized in that it comprises a secondary presser pivotally mounted relative to the main presser and pivotable, via of the slider moving to its forming position of the end portion of the undercut edge at a clamping position of the undercut edge on a lower conjugate counterpart of the support portion. Preferably, the slider carries a member causing the secondary presser to pivot to its undercut edge clamping position as the slider moves to its forming position of the end portion of the undercut and hold edge. of the secondary presser to this clamping position while the ram punch is forming the end portion of the undercut edge.

Advantageously, the pivoting and holding member of the secondary presser at its clamping position against the undercut edge is a gas spring. Advantageously, the secondary presser is pivotally mounted directly on the main presser.

A compressible member is interposed between the two main and secondary pressers to allow pivoting of the secondary presser to its clamping position against the undercut edge against a restoring force of the compressible member.

This compressible member is advantageously a gas spring. The main presser is supported by the moving equipment and is movable in a rectilinear direction towards the moving equipment against the restoring force of at least one member interposed between the moving equipment and the main presser when the moving equipment is lowered. Advantageously, the return member of the main presser is a gas spring.

Preferably, the displacement control means of the slider comprises a ramp integral with the moving element and cooperating with a ramp of the same inclination of the slider when the moving element is lowered. The slider is moved to its forming position of the end portion of the undercut edge against the restoring force of a member interposed between the slider and a portion of the lower frame. Advantageously, the return member of the slider is a gas spring. The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly in the following explanatory description made with reference to the accompanying drawings given solely by way of example illustrating an embodiment. of the invention and in which: - Figure 1 is a side view with section in a vertical plane of a forming tool according to the invention and occupying an inactive lifted position; - Figure 2 is a view similar to that of Figure 1 and showing the downward movement of the upper movable equipment of the tool of the invention; and FIG. 3 is a view similar to that of FIG. 2 and showing the forming of an end portion of an undercut edge of a sheet metal part clamped between the support part of a frame lower and the presser of the mobile equipment. Referring to the figures, reference numeral 1 denotes a tooling for performing a forming operation on a sheet metal part 2 already having an undercut 2a of angle OE relative to the vertical, more specifically forming a part of end 2b of the undercut 2a as will be described later.

The sheet metal part 2 against undercut 2a may be intended to be part of a body or body structure of a motor vehicle.

The tool 1 comprises a lower frame 3 comprising a support portion 4 shaped to support the sheet metal part 2 and its undercut edge 2a. Thus, the support portion 4 has a horizontal upper planar face 4a for supporting a flat portion 2c of the sheet metal part 2 and an inclined lower face 4b of conjugate form or constituting a counter-shape of the undercut 2a of the sheet metal part 2.

The tooling 1 further comprises a movable upper unit 5 that can be lowered to a working position in a rectilinear vertical direction relative to the lower frame 3 as indicated by the arrow F1 in FIG.

The moving equipment 5 comprises a horizontal top plate 6 with vertical guided displacement for example by at least one control cylinder and two fixed vertical guide columns, not shown, and a main presser 7 carried by the vertically movable plate 6.

The main presser 7 comprises a horizontal lower flat face 8 which can clamp on the flat face 4a of the support portion 4 of the frame 3 a portion of the flat portion 2c of the part 2 located adjacent to the undercut 2a of this part when the moving element 5 occupies its lowered position relative to the frame 3. The main presser 7 is mounted movably relative to the upper plate 6 of the crew 5 in a direction perpendicular to the plate 6. For this purpose, the body of the main presser 7 can be integral with the end of at least one vertical column slidably mounted relative to the plate 6 in a direction perpendicular thereto. In addition, at least one compressible member 6a is interposed between the plate 6 and the body of the main presser 7 to exert on the latter a restoring force of the main presser 7 at its lower position shown in FIG. 1 to which the lower planar face 8 is disposed at a distance above the flat face 4a of the bearing surface 4 of the frame 1 parallel thereto. Alternatively, the main presser 7 can be retained and mounted movably relative to the plate 6 only by two compressible members 6a, of the gas spring type, interposed between the body of the presser 7 and the plate 6. The tool 1 further comprises a slider 9 carrying a punch 10 in the form of a blade and which is slidably guided on a slide 11 secured to the lower frame 3 from an inactive position completely clear of the support portion 4 of the frame 3 shown in FIG. forming the end portion 2b of the undercut edge 2a of the part 2 and shown in FIG. 3. The displacement of the slider 9 from its unobstructed position to its forming position of the end part 2b of the part 2 is effected against the return force of a compressible member 12 interposed between a portion 13 of the slider 9 and a portion 14 of the frame 3. Preferably, the return member 12 is constituted by a reso rt gas. The moving equipment 5 is also provided with a means 15 secured to the upper plate 6 and which has a ramp-inclined lower face 16 that can cooperate, when the moving equipment 5 is lowered, with a ramped upper face 17 of the slide 9 The ramp means 16 may be formed simply by a vertical rigid plate integral with the upper plate 6 below it. According to the invention, the tooling 1 comprises a secondary presser 18 pivotally mounted relative to the main presser 7 and able to pivot, via the slide 9 moving towards its forming position of the end portion 2b of the edge against undercut 2a of the workpiece 2, at a clamping position of the undercut edge 2a on the corresponding lower counterpart 4b of the support part 4, and when the moving element 5 is in its lowered clamping position by the lower face 8 of the presser 7 of the flat part 2c of the part 2 on the horizontal face 4a of the support part 4. The secondary presser 18 is pivotally mounted directly on the main presser 7 via an axis pivoting member 19 extending horizontally in a direction perpendicular to the plane of FIG. 1. A compressible member 20 is interposed between the body of the main presser 7 and the body of the secondary presser 18 to exert on the latter a biasing force of the secondary presser 18 to its disengaged position relatively far from the lower part of the body of the main presser 7 as shown in Figure 1. Advantageously, the return member 20 is constituted by a gas spring. The secondary presser 18 comprises at its lower end portion an inclined flat face 21 which can be brought into tight abutment against the undercut edge 2a of the part 2 by the slider 9 and when the moving element 5 occupies its lowered position. . The slider 9 carries, integral with its upper part opposite the slider 11, a member 22 for causing the pivoting of the secondary presser 18 to its clamping position of the undercut edge 2a during movement of the slider 9 to its position of forming the end portion 2b and holding the secondary presser 18 to this clamping position while the punch 10 of the slider 9 performs the forming of this end portion 2b. Advantageously, the member 22 is constituted by a gas spring.

The operation of the tool 1 is already largely in the description above and will now be explained.

Firstly, the sheet metal part 2 is arranged on the support part 4 of the frame 3 so that the flat part 2c bears on the horizontal face 4a of the support part 4 and the undercut edge 2a 4b of the part 4, the end part 2b being in the extension of this edge 2a as shown in FIG. 1. This figure also shows that the main presser 7 and the secondary presser 18 as well as the means 15 to ramp 16 for moving the slide 9 of the moving element 5 occupy a high position, with the presser 18 in the disengaged or retracted position relative to the lower part of the main presser 7 under the action of the 20, and the slider 9 also occupies a position retracted or disengaged relative to the support portion 4 under the action of the return member 12. When the moving element 5 is controlled to descend vertically, the lower planar face 8 of main presser 7 comes into contact on the corresponding portion of the part 2c of the part 2 to cause the displacement of the main presser 7 towards the plate 6 against the restoring force of the member 6a to enclose the part 2c of the piece 2 between the face 4a and the face 8 of the presser 7. In addition, the ramp 16 of the means 15 bears on the ramp 17 of the slider 9 to cause the displacement of the latter along the arrow F2 towards the edge against de-dusting the workpiece 2 until the member 22 of the slider 9 comes into contact with the lower end portion of the secondary presser 18, the opposite face 21 of which faces the undercut edge 2a of the piece 2 to the position shown in FIG. 2. Then, the moving equipment 5 continues its descent until the lower planar face 8 of the main presser 7 strongly encloses the portion of the flat part 2c of the part 2 on the face horizontal 4a of the part of the sup port under the action of the member 6a compressed to the maximum and the member 22 causes the pivoting of the secondary presser 18 by the controlled displacement of the slide 9 by the two ramps 16, 17 in contact with each other to exercise on the inclined face 21 of the secondary presser 18 a clamping force of the undercut edge 2a of the part 2 on the counter-form 4b of the support portion 4 as shown in Figure 3. In this way, the piece sheet 2 is correctly tightened on the support portion 4 and the punch 10 of the slider 9 performs the operation of forming or folding back the end portion 2b of the undercut edge 2a on the counterform 4c of the support portion 4 located below the counter form 4b. It should be noted that at the position of the forming slider 9 of the end portion 2b, the member 12 is completely compressed. Once the folding forming of the end portion 2b of the part 2 has been performed, the moving element 5 is controlled so that it is moved upwards in order to disengage the ramp 16 from the means 15 of the ramp 17 of the slider 9 whose member 12 causes the movement of the slide in the opposite direction to the arrow F2 in order to disengage firstly the punch 10 of the end portion 2b and secondly the member 22 for holding the secondary presser 18 which can then pivot about the axis 19 in the disengagement direction of its face 21 of the undercut 2a of the part 2 under the action of the return member 20.

The moving assembly 5 and the slider 9 then return to their fully disengaged position in FIG. 1, to which the formed part 2 can be removed from its support part 4. As can be seen from the foregoing description, the installation articulated secondary presser 18 through the slider 9 to clamp the undercut 2a on the counter-form 4b of the support portion 4 is performed almost simultaneously with the forming by the punch 10 of the slider of the end portion 2b of the part 2 on its counter-form 4c of the support part 4.

Moreover, the tooling of the invention makes it possible to intervene directly on each blade of the punch 10 when this tooling occupies its inactive open position of FIG. 1 without having to disassemble the slide 9. In this way, the grinding operations directly on the blade of the punch without any disassembly can be realized, providing a time saving compared to known tools requiring disassembly of the slide to intervene on the forming blades, saving time resulting in cost reductions.

Finally, the tooling of the invention is of an extremely simple and less expensive structure compared to the tooling described in JP 62-199231.

Claims (10)

  1. REVENDICATIONS1. Tools for forming an end portion (2b) of an undercut edge (2a) of a sheet metal part (2), comprising a lower frame (3) having a shaped support portion (4) for supporting the sheet metal part (2) and its undercut edge (2a), a movable upper unit (5) which can be lowered in a rectilinear direction with respect to the lower frame (3) and comprising a main presser (7) adapted to clamp the sheet metal part (2) on the support part (4) in the lowered position of the moving element (5), a slide (9) bearing a punch (10) and with a controlled displacement on the lower frame ( 3) at a position permitting the punch (10) to fold forming the end portion (2b) of the undercut edge (2a) on a lower conjugate counter-form (4c) of the support portion (4); ), and means (15) carried by the moving element (5) for controlling the displacement of the slide (9) at its forming position of the at the end portion (2b) of the undercut edge (2a) when the moving assembly (5) is lowered to its position at which the main presser (7) squeezes the sheet metal part (2) on the part of support (4), characterized in that it comprises a secondary presser (18) pivotally mounted relative to the main presser (7) and able to pivot, via the slide (9) moving towards its forming position of the end portion (2b) of the undercut edge (2a) at a clamping position of the undercut edge (2a) on a conjugate lower counter-form (4b) of the support portion (4).
  2. 2. Tooling according to claim 1, characterized in that the slide (9) carries a member (22) causing the pivoting of the secondary presser (18) to its clamping position of the undercut edge (2a) during the movement of the slide (9) towards its forming position of the end portion (2b) of the undercut edge (2a) and holding the secondary presser (18) at this clamping position while the ram punch (10). (9) forming the end portion (2b) of the undercut edge (2a).
  3. 3. Tooling according to claim 2, characterized in that the pivot member and holding (22) of the secondary presser (18) at its clamping position against the undercut edge (2a) is a gas spring.
  4. 4. Tooling according to one of the preceding claims, characterized in that the secondary presser (18) is pivotally mounted directly on the main presser (7).
  5. 5. Tooling according to claim 4, characterized in that a compressible member (20) is interposed between the two main pressers (7) and secondary (18) to allow the pivoting of the secondary presser (18) to its clamping position against the undercut edge (2a) against a restoring force of the compressible member (20). 20
  6. 6. Tooling according to claim 5, characterized in that the compressible member (20) is a gas spring.
  7. 7. Tooling according to one of the preceding claims, characterized in that the main presser (7) is supported by the moving element (5) and is movable in a rectilinear direction towards the moving element (5) at the against the restoring force of at least one member (6a) interposed between the moving element (5) and the main presser (7) when the moving element (5) is lowered.
  8. 8. Tooling according to claim 7, characterized in that the return member (6a) is a gas spring.
  9. 9. Tooling according to one of the preceding claims, characterized in that the control means 35 (15) for moving the slider (9) comprises a ramp (16) integral with the movable element (5) and cooperating with a ramp ( 17) of the same inclination of the slide (9) when the moving element (5) is lowered.
  10. Tool according to one of the preceding claims, characterized in that the slide (9) is moved to its forming position of the end portion (2b) of the undercut edge (2a) against the return force of a member (12) interposed between the slider (9) and a portion of the lower frame (3).
FR1155139A 2011-06-10 2011-06-10 Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position Pending FR2976197A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1155139A FR2976197A1 (en) 2011-06-10 2011-06-10 Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1155139A FR2976197A1 (en) 2011-06-10 2011-06-10 Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position

Publications (1)

Publication Number Publication Date
FR2976197A1 true FR2976197A1 (en) 2012-12-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
FR1155139A Pending FR2976197A1 (en) 2011-06-10 2011-06-10 Tool for forming end portion of undercut edge of sheet part in body structure of car, has main presser and secondary presser that pivots to tightening position of edge on lower face of support part via slide moving toward forming position

Country Status (1)

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FR (1) FR2976197A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089904A1 (en) * 1982-03-19 1983-09-28 Alexis Pauzin Flat bending device
JPS62199231A (en) * 1986-02-26 1987-09-02 Honda Motor Co Ltd Metal die device
EP1103319A1 (en) * 1999-11-15 2001-05-30 Umix Co., Ltd. Negative angle-forming die
EP1535674A1 (en) * 2003-11-27 2005-06-01 Yourbusiness Co., Ltd. Negative-angle press-working die

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089904A1 (en) * 1982-03-19 1983-09-28 Alexis Pauzin Flat bending device
JPS62199231A (en) * 1986-02-26 1987-09-02 Honda Motor Co Ltd Metal die device
EP1103319A1 (en) * 1999-11-15 2001-05-30 Umix Co., Ltd. Negative angle-forming die
EP1535674A1 (en) * 2003-11-27 2005-06-01 Yourbusiness Co., Ltd. Negative-angle press-working die

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