EP3003593B1 - Stamping tool comprising a slide mounted on a rotary press - Google Patents

Description

The invention relates to press stamping equipment according to the preamble of claim 1. In particular, the invention relates to an equipment which comprises a stamping slide embedded on a rotary presser.

The figure 1 shows a metal part 300 forming part of a motor vehicle. The part comprises an undercut portion 310 in which openings 320 are disposed. Typically, it is difficult to make such openings 320 by stamping the metal sheet on the undercut portion using conventional stamping tools. These tools do not allow access to the surface 310. This is why the openings are typically applied at a later stage of the manufacture of the part, for example during a shoeing step. This, however, generates an extra work step.

The patent document EP 0 858 847 B1 discloses a rotary press stamping tool, which allows the creation of stampings or punchings on undercut sheet metal surfaces. The punching ram is controlled by the upper frame, attached to the press on the stamping press, and cooperates with an axial groove of the rotary presser. A change in the slider causes a major change in the upper frame of the press.

The invention aims to provide press stamping equipment overcomes at least one of the disadvantages mentioned above. More particularly, the object of the invention is to provide a pressing press equipment which makes it possible to draw on undercut surfaces of a metal sheet.

The invention relates to a pressing press equipment comprising a moving part in a given direction according to claim 1.

Preferably the equipment is movable in the vertical direction. The equipment is advantageously part of the upper frame of a stamping press. The equipment comprises a fixed part towards which the moving part can be approached. The fixed part makes advantageously part of the lower frame of a stamping press. The equipment also includes a rotary press which has an axial notch. The rotary presser is rotatably mounted on the fixed part.

Rotating means are able to change the radial position of the rotary press between a first open position which makes it possible to load a portion of sheet metal to stamp or punch into said notch, and a second working position.

The equipment is characterized in that the rotary press comprises a slider for stamping or punching an undercut portion of the sheet with a punch. The slider is slidably mounted along a wall of the axial notch of the presser as the moving part approaches the fixed part and when the rotary press is in the working position.

Preferably, the movable portion may comprise an actuating surface, oriented so as to actuate the slide by pressing and sliding on a corresponding surface thereof, when the movable part is close to the fixed part.

The rotation means may preferably comprise a pneumatic cylinder whose first end is fixed to the fixed part of the equipment, and whose rod is fixed to the rotary presser. Preferably, the rod is attached to a peripheral surface of the rotary presser, so that the actuation of the pneumatic cylinder makes it possible to change the radial orientation of the presser.

Preferably, the slide may comprise a sliding element which allows it to slide along a fixed sliding element arranged on a wall of the axial notch of the rotary presser.

The movable portion may preferably comprise at least one centering element which is able to bear on a corresponding support element of the fixed part when the moving part approaches the fixed part. The centering is preferably performed by the pressure of a gas spring which can exert a force on the lower part. The gas spring exerts pressure on the rotary press to clamp the sheet. Centering cones, placed opposite each other, one on the part mobile and one on the fixed part, come into pressing contact under the effect of the gas spring when it is actuated, ensuring the correct position of the rotary press at each press stroke.

Preferably, the movable portion comprises at least one surface which is oriented towards the fixed part, and arranged to press the sheet portion against the fixed part when the latter is loaded in the presser.

• mise à disposition de l'équipement conforme à l'invention, la partie mobile étant éloignée de la partie fixe, le presseur rotatif étant dans une première position permettant la charge de la portion de tôle;
• chargement de la portion de tôle à emboutir sur le presseur rotatif;
• rotation du presseur rotatif à l'aide des moyens de rotation, de façon à le placer dans une seconde position de travail ;
• rapprochement de la partie mobile et de la partie fixe par descente de la partie mobile ;
• coulissement du coulisseau en direction de la partie de tôle à emboutir ou poinçonner suite à l'appui de la partie mobile sur le coulisseau ;
• emboutissage et/ou poinçonnage de la partie de tôle en fin de course du coulisseau.

The invention relates to a stamping press comprising a stamping equipment according to the invention as defined in claim 8. The press finds its particular use in the field of coin stamping for the automotive industry . Finally, the invention also relates to a process for stamping or punching an undercut portion of a portion of sheet metal using stamping equipment according to the invention as defined in claim 9. The method is remarkable in that it comprises the following steps:

• provision of the equipment according to the invention, the moving part being remote from the fixed part, the rotary pressing being in a first position allowing the sheet portion to be loaded;
• loading the sheet metal portion on the rotary presser;
• rotation of the rotary presser by means of rotation means so as to place it in a second working position;
• approaching the movable portion and the fixed portion by descent of the movable portion;
• sliding of the slider in the direction of the sheet metal part to be punched or stamped following the support of the movable part on the slider;
• stamping and / or punching of the sheet metal portion at the end of travel of the slide.

Preferably the method may further comprise the steps of moving the moving part back after stamping or punching the sheet, and handing the rotary presser in its first position, so as to allow the release of the stamped sheet portion.

The equipment according to the invention makes it possible to stamp or punch an undercut portion of a metal sheet, in particular intended to form a part of a motor vehicle, by converting the generally vertical movement of movement of the upper frame. a drawing press at the lower frame, in a movement directed in a non-vertical direction, by a stamping slide. The integration of the slider on a rotary presser keeps the sheet firmly in place between the frames, using the pressure exerted by the upper frame on the lower frame. At the same time, the part undercut against the sheet remains accessible by the punch embedded on the slide.

• la figure 1 illustre une pièce métallique d'un véhicule automobile ;
• la figure 2 illustre de manière schématique une coupe latérale de l'équipement selon un mode préférentiel de l'invention, le presseur rotatif étant en position ouverte et les partie mobiles et fixes étant séparées ;
• la figure 3 illustre de manière schématique une coupe latérale au niveau du coulisseau de l'équipement selon un mode préférentiel de l'invention, le presseur rotatif étant en position ouverte et les partie mobiles et fixes étant séparées ;
• la figure 4 illustre de manière schématique une coupe latérale au niveau du coulisseau de l'équipement selon un mode préférentiel de l'invention, le presseur rotatif étant en position de travail et les partie mobiles et fixes étant séparées ;
• la figure 5 illustre de manière schématique une coupe latérale au niveau du coulisseau de l'équipement selon un mode préférentiel de l'invention, le presseur rotatif étant en position de travail, les parties mobiles et fixes étant en contact et le coulisseau étant en fin de course.

Other features and advantages of the present invention will be better understood from the description and the drawings, among which:

• the figure 1 illustrates a metal part of a motor vehicle;
• the figure 2 schematically illustrates a side section of the equipment according to a preferred embodiment of the invention, the rotary press being in the open position and the moving and fixed parts being separated;
• the figure 3 schematically illustrates a side section at the slide of the equipment according to a preferred embodiment of the invention, the rotary presser being in the open position and the movable and fixed parts being separated;
• the figure 4 schematically illustrates a side section at the slide of the equipment according to a preferred embodiment of the invention, the rotary press being in the working position and the movable and fixed parts being separated;
• the figure 5 schematically illustrates a side section at the slide of the equipment according to a preferred embodiment of the invention, the rotary press being in the working position, the movable and stationary parts being in contact and the slide being at the end of the race.

The figure 1 has been previously described, it shows a metal part of a motor vehicle, which is achievable in particular by stamping using the equipment which is described in the following paragraphs.

The figure 2 shows a pressing press equipment 100 according to the invention. The equipment comprises a movable part 110 which can be moved in the generally vertical direction to press a fixed part 120. In known manner, the movable part can be part of the upper frame of a stamping press, while the fixed part may be part of the lower frame of such a press. In the following paragraphs it is assumed that means known per se are available to allow and control the relative movement of the parts 110, 120. Such means being within the abilities of those skilled in the art, they will not be described. in more detail in this description.

The fixed portion 120 includes a rotary press 130 rotatably mounted. Rotating means 140 are provided to change the radial orientation of the rotary press. Preferably it is at least one pneumatic cylinder attached to the fixed part, and whose rod connected to the rotary press 130 allows the controlled rotation thereof when the actuator is actuated. The pneumatic cylinder can be actuated and controlled by known and non-illustrated control means. Other means of making rotation means will be within the reach of the person skilled in the art.

On the Figures 2 and 3 the presser 130 is in a first position which allows loading and unloading of the sheet 300.

The drum forming the rotary press 130 comprises an axial notch 132 which makes it possible to receive the undercut portion 310 of a plate 300 to be stamped or stamped, as is better visible on the figure 3 especially. The sheet 300 is only partially visible by virtue of the position of the side section illustrated.

The rotary press comprises a slider 150 which is slidably mounted in a generally radial direction of the drum, so as to slide along a wall of the notch 132. This wall comprises a fixed sliding element 134 which cooperates with the sliding element 154 of the slider.

The slider 150 includes a stamping punch 160 which is oriented to engage the undercut portion 310 of the metal sheet due to a counterclockwise radial movement as indicated on FIG. the figure 3 . Part 310 is placed on a punching die that allows interaction of the punch with the sheet.

The upper portion 110 includes one or more bearing surfaces 114 which serve to contact the sheet 300 and press the latter against the lower part 120 of the equipment, when the upper part descends on it.

At least one centering element 116 is disposed on the face of the movable part 110 which is oriented towards the fixed part 120. It is for example a gas spring which bears on a corresponding structure, such as a centering cone 126 when the parts 110 and 120 come into pressure contact.

Finally, the upper part 110 comprises an actuating surface 112 oriented in a direction generally opposite to the lower part 120. It makes it possible to contact the sliding element 152 of the slide when the rotary press is in the working position, and when the upper part mobile 110 comes into pressure contact with the fixed lower part 120.

The figure 4 shows the working position of the rotary press 130. The controlled activation of the pneumatic cylinder 140 has caused the controlled rotation of the drum 130 in the counterclockwise direction. The drum took the on-board slider 150 into its axial notch, so as to place the punch in direct contact with the stamping or stamping plate 130. The orientation of the element 152 of the slider and chosen as in the working position of the rotary presser, the element 152 is oriented generally parallel and directly opposite the actuating surface 112 of the movable part 110. It becomes apparent that a pressure of the actuating surface 112 directed in the vertical direction on the sliding element 152 will cause sliding of the slider on the element 134, along the wall of the axial notch of the drum 130. This movement will concentrate the pressure force in the direction of the punch 160, which can stamp or punching the sheet metal member 300. Additional guiding means can be provided without departing from the context of the invention. Down, the surfaces 114 of the movable portion 110 will come into contact with the sheet 300 and hold it in place on the fixed portion 120 during stamping or punching. Preferably, the surfaces 114 are disposed on spring support members, so as to concentrate the main pressure force exerted by the movable portion 110 on the slider.

The figure 5 shows the slider 150 at the end of the race. The slider moved toward the undercut portion 310 of the sheet that resides on the punch die. The movement of the slider was effected by the vertical pressure exerted by the actuating surface 112 on the sliding element 152. This pressure caused the sliding surface 154 of the slider 150 to slide on the fixed sliding element. 134 on the wall of the axial notch of the rotary press 130. The punch has stamped or pierced the part 310. The arrangement of the slider has made it possible to concentrate the general pressure force on the punch, this effort being necessary for the action of stamping or punching.

A controlled decline of the movable portion 110 upwards, in particular by releasing the force of the gas spring 116, will allow the repositioning of the rotary press to its initial position. This position is obtained by a controlled rotation of the drum 130 in the direction of clockwise. Once the initial position is acquired, the stamped sheet can be unloaded from the presser.

Claims (10)

1. Swaging press equipment (100) comprising a part (110) able to move in a given direction;
   a fixed part (120) towards which the movable part can be moved; a rotary presser (130) comprising an axial recess (132) and mounted so as to rotate on the fixed part (120);
   rotation means (140) able to change the radial position of the rotary presser (130) between a first open position that makes it possible to load a portion of sheet metal to be pressed in said recess and a second working position;
   characterised in that
   the rotary presser (130) comprises a runner (150) for pressing or punching an undercut part of the metal sheet by means of a punch (160), the runner being mounted so as to slide along a wall of the recess (132) of the presser (130) when the movable part (110) approaches the fixed part (120) and when the rotary presser is in the working position.
2. Equipment according to claim 1, characterised in that the movable part (110) comprises an actuation surface (112), oriented so as to actuate the runner (150) by pressing and sliding on a corresponding surface (152) thereof, when the movable part (110) approaches the fixed part (120).
3. Equipment according to either of claims 1 or 2, characterised in that the rotation means (140) comprise a pneumatic actuator (140), a first end of which is fixed to the fixed part (120) and the rod of which is fixed to the rotary presser (130).
4. Equipment according to any of claims 1 to 3, characterised in that the runner (150) comprises a sliding element (150) that enables it to slide along a fixed sliding element (134) disposed on a wall of the axial recess (132) of the rotary presser.
5. Equipment according to any of claims 1 to 4, characterised in that the movable part (110) comprises at least one centring element (116) that is able to bear on a corresponding support element (126) of the fixed part (120) when the movable part approaches the fixed part.
6. Equipment according to claim 5, characterised in that the centring element (116) comprises a gas spring able to exert a pressure on at least one centring cone (126) of the fixed part when the movable part approaches the fixed part.
7. Equipment according to any of claims 1 to 6, characterised in that the movable part (110) comprises at least one surface (114) that is directed towards to the fixed part (120) and is disposed so as to press the sheet-metal part against the fixed part (120) when the metal sheet is loaded in the presser and when the movable part is moved closer to the fixed part.
8. Swaging or punching press comprising swaging equipment, characterised in that the equipment is in accordance with any of claims 1 to 7.
9. Method for swaging an undercut part (310) of a portion of metal sheet (300) by means of swaging equipment according to any of claims 1 to 7, the method comprising the steps of:

   - making the equipment available, the movable part (110) being distant from the fixed part (120), the rotary presser (130) being in a first position enabling the portion of metal sheet (300) to be loaded;

   - loading the portion of metal on the rotary presser (130);

   - rotating the rotary presser (130) by means of the rotation means (140), so as to place it in a second working position;

   - moving the movable part (110) and the fixed part (120) closer together by lowering the movable part (110);

   - sliding the runner (150) in the direction of the sheet-metal part to be swaged or punched (310) following the pressing of the part (110) on the runner;

   - swaging and/or punching the sheet-metal part (310).
10. Method according to claim 9, characterised in that it comprises the steps of withdrawing the movable part (110) after the swaging of the metal sheet and returning the rotary presser (130) to its first position, so as to allow release of the swaged portion of metal sheet.

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