DE4412232A1 - Mechanism for preliminary and final flanging of car body parts - Google Patents

Abstract

The flanging slider (2) is mounted with an inclination. The control roller (4) on the flanging bed (1) moves the slider into different working portions via a control cam on the slider. The flanging bed carries out a vertical motion, when the slider is in horizontal or inclined position and is held against the roller by a spring force.The slider inclined position is used for a flange with an opening angle of 120 deg.. For a flange opening angle of 90 deg. a horizontally mounted slider is sufficient and is used with a single preliminary flanging position.

Description

The invention relates to a flanging device for pre-flanging and finishing flanging body parts.

The term "flanging" means the positive connection of two parts Crimping a flange. This process is most common in vehicle production applied where it is used to assemble formed sheet metal parts. For example a car door consists of the outer skin and the inner sheet, which are used in flaring tools or Flanging devices are connected, the inner sheet being controlled by means of Hold-down bars are centered and held.

Various possibilities for flanging body parts are known in the art, for example:

• 1.) Flaring tools that are used in presses and by a vertical movement Flange the flange from the upper part of the tool to the lower part.
• 2.) Flanging devices in which the flanging bed is fixed and by hydraulic or electrically operated slide, or mechanical rocker arm elements, the flanged flange is tipped.

The first type requires a press and only one can be used per tool Operation can be carried out, which takes several to finish flanging a body part Tools and presses are required. This creates a high space requirement considerable expense. It is also the case with flaring tools because of the press tops not possible to insert the body parts from above using handling systems.

With the second design, no press is required and body parts can be seen from above be inserted, however, the control of the flaring slide or the rocker arm elements complex and sometimes very unstable.

The invention has for its object, body parts in one device by as possible simple operation of the flaring slides with a short cycle time, pre-flanging and finishing.

This object is achieved by the invention according to the main claim. A Design is the subject of the subclaim.

The invention is explained in more detail with reference to FIGS. 1 to 9. Figs. 1 to 4 show a cross-section, Figs. 5 to 9 a longitudinal section through a motor vehicle door with an inventive structure of the hemming device.

Figs. 1 to 4 show the first embodiment, is required in only one pre-flanging. This version is used when the flange to be flanged has an angle α 1 of approximately 90 degrees with respect to the flare bed. The angle of the flange to be flanged depends on the shape of the body part and thus on the previous folding process.

In the loading / unloading position shown, the body parts to be connected are inserted from above. The electrically or hydraulically driven crimping bed ( 1 ) then moves vertically upwards. The mounted and spring-loaded slide ( 2 ) follows the contour of the control cam ( 3 ) and brings it first into the pre-flanging position. In this position, the flange is tilted about 45 degrees. When the flare bed is raised further, the slide reaches the finished flare position, which presses the flange fully shut.

Now the working stroke has ended, the crimp bed moves back into the loading / unloading position and the part can be removed.

Figs. 5 to 9 show the second embodiment in which a further pre-flanging is required. This version is used when the flange to be flanged has an angle α₂ of approximately 120 degrees with respect to the flare bed.

The sequence of the flanging process corresponds to that of the previous embodiment with the difference that the control role must pass another paragraph.

Since the angle β (see FIG. 8) of the flanging jaw is very small compared to the horizontal during the second pre-flanging, this requires a control curve contour which also has a small angle γ relative to the horizontal in order to avoid a collision.

During the rolling of the control roller on the control cam, the normal force F _N acts on the slide, which represents a reaction force of the spring force F _F. Since the low normal force component F _{NX is} not sufficient to displace the slide during the second pre-flanging, the slide is mounted at an incline. This enables the slide to be displaced.

The advantages achieved by the invention are, in particular, that in one device can be pre-flared and finished with a simple control of the Flaring slide. Combined with a short cycle time results in a clear Cost reduction compared to flaring tools that need presses and Flanging devices that require complex control of the flanging slides or Have rocker arm elements and some can only perform one operation.

Claims (2)

1. flanging device for pre-and finish flanging of body parts, characterized in that the flanging slide is moved by a control roller and cam. 2. Flanging device according to claim 1, characterized in that the flanging slide is inclined.