DE102008006853A1 - Transfer carriage for the side clamping frame of a geometrical station for joining body shell parts of a motor vehicle, comprises a standby position, a working position and guide rails arranged in the standby position - Google Patents

Abstract

The transfer carriage (3) for joining body shell parts of a motor vehicle, comprises standby position, a working position and guide rails (6) arranged in the standby position. The body shell parts are guidable on a geometrically determined roll body and auxiliary roll body track-guided between the standby position and the working position exactly aligned by the geometrically determined roll body. The guide rails in the standby position are held alone on the part of the auxiliary roll body while the geometrical determination of roll body externally contact to the assigned guide rails. The transfer carriage (3) for joining body shell parts of a motor vehicle, comprises standby position, a working position and guide rails (6) arranged in the standby position. The body shell parts are guidable on a geometrically determined roll body and auxiliary roll body track-guided between the standby position and the working position exactly aligned by the geometrically determined roll body. The guide rails in the standby position are held alone on the part of the auxiliary roll body while the geometrical determination of roll body externally contact to the assigned guide rails. The roll body and the auxiliary roll body are coupled together in rotatably fixed and unidirectional manner. The rotational axis of the roll body and the auxiliary roll body are stationary arranged at the transfer carriage and the rail running faces are equipped with a recess stretching itself over the area of the standby position of the geometrically determined roll body or with a hollow-like recess to space in the standby position of the roll body under release of an air gap. The roll body and the auxiliary roll body are actively driven and sequentially positioned on the same guide rails. The auxiliary roll bodies are arranged in the direction of the standby position displaced to the geometrically determined roll body at the transfer carriage. The transfer carriage is equipped with four identical roll combinations existing out of a roll body exposed and completely loaded in the standby position.

Description

The The invention relates to a transport carriage, in particular for the side clamping frame of a geometry station for joining of automotive body shell parts, according to the preamble of Patent claim 1.

Carriage of this kind, as in the case of DE 10 2007 024 589.2 described geometry station for adjusting the side clamping frame use, contain four rail-guided, each consisting of a geometriebestimmenden and an auxiliary role roller combinations with fixedly arranged on the transport axes of rotation, of which assume the geometriebestimmenden roles the orientation of the transport carriage and mounted on this tenter in the working position while the auxiliary rollers serve to keep the geometry-determined rollers at this point when driving over rail joints of load peaks. The rollers must align the transport carriage together with the typically several tons heavy tenter in the working position with an accuracy in the micron range, namely the order of 10 microns, and this at daily mostly more than a thousand carriage strokes, as it is otherwise inadmissible, with increasing height the clamping frame larger incorrect settings and corresponding deviations in the joining process of the body parts comes. For this reason, the roles and the associated bearings are often checked for compliance with the required accuracy limits and adjusted or replaced if necessary, which is always associated with a considerable maintenance and Stilistandzeiten the geometry station, since the transport carriage for this purpose with the roles of the Guide rails must be lifted.

Furthermore, tool carriages are known from the prior art, which are movable on a machine bed, but in the working position of the carriage are placed directly on this in such a way that the rollers are either height-adjustable mounted on the carriage and hydraulically on and extendable ( DE-PS 1 221 856 ) or that the guideway in that section on which the rollers are in the working position of the carriage, by means of a hydraulic actuator between a raised, flush with the guideway and a lowered, the rollers releasing stroke position is reversible ( DE 43 34 373 A1 ). In both cases, the carriage must be lowered or raised respectively before and after each operation by a lifting operation of the rollers or guideway pieces, which on the one hand has a negative effect on the cycle times of the manufacturing process and on the other requires increased construction, energy and control effort.

task The invention is a rail-guided support carriage to create the type mentioned, whose rolling body with a minimum of construction, energy and time in a respect to the Guideways can be moved freely position.

These The object is achieved by the in the claim 1 marked support carriage solved.

at the support carriage according to the invention come geometry - determining rolling body in the waiting position of the Sliding automatically from the associated guide rail free, without the carriage having to be raised for this purpose, that the Hilfsrollkörper take over at this point the full load and the rail geometry is designed so that between the rail running surface and the geometry-determining rolling bodies in the waiting position of the carriage an air gap is kept free. According to the invention Thus, the rolling body waiving elaborate, power-operated lifting mechanisms for cost or maintenance purposes, and in particular also for readjustment or replacement of the Rolling body and / or the parent rolling bearings, freely accessible as soon as the transport carriage is in the waiting position is located.

There the rolling bodies in the waiting position of the carriage of the Rail contact are free and only in contact with the rail surface advised when the sled toward his working position moved, is particularly preferred according to claim 2 Embodiment of the invention a by the roller moment of inertia Conditional slip avoided at this point by the fact that the geometry-determining and the auxiliary rolling body each concurrently rotationally locked Coupled with each other, so that the rolling body too in the non-contact state a synchronous to the carriage movement rotational speed maintained.

A further, structurally particularly preferred simplification is according to claim 3 by an axle fixed arrangement of the rolling elements on the transport carriage achieved, the rail running surfaces in this case expediently with one of the rolling bodies in the waiting position of the Carriage leaving a clearance gap clearance, namely according to claim 4 preferably with a hollowed-in recess are.

In a concrete application of the invention, the transport carriage is moved by a stationary, acting on the outside of the carriage linear drive, but it is without further notice also possible, as preferred according to claim 5, to equip the carriage itself with an active roller drive.

Out For further structural simplification are the geometry-determining and the auxiliary rolling body according to claim 6 expediently in each case one behind the other positioned on the same guide rail, with the Auxiliary roller body according to claim 7 in particularly preferred Way in the direction of the waiting position offset to the geometry-determining Rolling bodies are arranged on the carriage, so that the auxiliary roller body in a roller distance corresponding Distance to the waiting position also in the area of the rail recess located and then freely accessible for maintenance purposes, while the associated geometry-determining rolling bodies take over the full load bearing support at this point.

For a stable, load-compatible slide guide recommends it finally, the support carriage according to claim 8 four identical ones, each one exposed in the waiting position and a then fully loaded rolling body existing role combinations to provide.

The Invention will now be described with reference to an embodiment explained in conjunction with the drawings. It shows in a highly schematic representation:

1a , B a geometry station with mounted on transport slide side frame in the waiting position (a) or in the working position (b);

2 an enlarged partial view of the transport carriage with the mounted on this tenter in the working position; and

3 a detailed representation of one of the roller combinations in the waiting position of the transport carriage.

In the 1a , b is a geometry welding station is shown, which is arranged in the course of a production line and serves to supply and discharged by a conveyor system, in the Fign. dash-dotted shown body parts, namely in particular the bottom group and the body side parts, positionally accurate to fix each other and then with the help of - not for clarity - welding welding robots welded together.

For fixing the body parts to the geometry station, this contains a conventional floor tensioning system 1 for the body floor group and on both sides of the geometry station one lateral clamping frame each 2 , which is on a transport carriage 3 transverse to the conveying direction of the conveyor system between a waiting position ( 1a . 3 ) and a body side part of the position accurately positioned on the floor group working position ( 1b . 2 ) is movably mounted. The clamping frames 2 are stiffened like a truss and are in the working position on cross struts 4 locked together to form a rigid frame composite.

The transport carriages 3 are each about four rail-guided role combinations 5 each one of which is a geometry-based, axle-fixed to the sled 3 arranged roll 5.1 , an auxiliary roller also axially fixed to the carriage 5.2 and a tension roller 5.3 exists, between the working and the waiting position adjustable friction, either by means of a slide-fixed roller drive or by means of an external, effective in the carriage stroke linear actuator, such as a hydraulic piston-cylinder unit.

Through the tension rollers 5.3 become the geometry-determining roles 5.1 on the assigned guide rail 6 clamped backlash so that they support the carriage 3 and the tenter mounted on it 2 position highly accurately in working position while the auxiliary rollers 5.2 to relieve the geometry-determining roles 5.1 are provided.

In the embodiment shown, the guide rails 6 each two-piece with a fixed and one on a conveyor pallet 7 fixed rail section 6.1 respectively. 6.2 trained, with the conveyor pallet 7 on a perpendicular to the plane running conveyor - as in 2 through the guide rollers 8th indicated - is movable. When changing the body type remain the transport carriage 3 together with the tenter 2 on the rail pieces 6.2 the conveyor pallets 7 and are transported with these on the conveyor track, while another conveyor pallet 7 on which there is a transport carriage 3 with a tenter frame required for the new body type 2 located, delivered on the conveyor track and with their rail pieces 6.2 in alignment with the stationary rail sections 6.1 is aligned, whereupon the transport carriage 3 with a clamping frame replaced in this way 2 moved into the working position and the new Karoserietyp after the mutual locking of the clamping frame 2 can be welded.

As the 2 and 3 show are in the treads of rail pieces 6.2 Hollow-like depressions 9 ground, which are positioned and designed so that the geometry-determining roles 5.1 in the waiting position of the carriage 3 in the area of rail recesses 9 located and each of them by an air gap 10 ( 3 ) are kept free. In this condition are the auxiliary rollers 5.2 load-bearing only, the geometry-determined roles 5.1 however, freely accessible, so that the necessary checks and maintenance, such as readjustment or replacement of the roll cages, can be carried out easily, so the tight tolerances in the order of 10 microns, for reasons of high joint accuracy of the body parts for carriage alignment in the working position are given to be able to comply.

According to a further essential aspect of the invention, the geometry-determining and the auxiliary roles 5.1 and 5.2 - z. B. on the in 3 illustrated intermediate wheel 11 - synchronously coupled with each other in a rotationally locked manner. This will ensure that the roles 5 during a lifting movement of the carriage 3 their rotational speed even when driving over the rail recesses 9 maintained and therefore slip-free re-contact the rail running surface record.

Is the transport carriage 3 in a roll distance between geometry-determining and auxiliary roll 5.1 . 5.2 corresponding distance to the waiting position, so lie instead of the geometry-determining the auxiliary roles 5.2 in the area of rail recesses 9 and the roles 5.1 take over at this point then the entire load. Thus, the auxiliary rollers 5.2 as easy as the geometry-determining roles 5.1 be made available for inspection and maintenance purposes.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102007024589 [0002]
• - DE 1221856 [0003]
• - DE 4334373 A1 [0003]

Claims (8)

Transport carriage, in particular for the side clamping frame of a geometry station for joining motor vehicle body parts, which can be moved on geometry-determined rolling bodies and their associated auxiliary rolling elements rail-guided between a waiting and a geometriebestimmenden rolling body exactly aligned working position, characterized in that the guide rails ( 6 ) in the waiting position of the transport carriage ( 3 ) solely on the part of auxiliary roll body ( 5.2 ), while the geometry-determining rolling bodies ( 5.1 ) are held out of contact with the associated guide rail. Transport carriage according to claim 1, characterized in that the geometry-determining and the auxiliary rolling bodies ( 5.1 . 5.2 ) are synchronously coupled with each other concurrently. Transport carriage according to claim 1 or 2, characterized in that the axes of rotation of the geometry-determining and auxiliary rolling bodies ( 5.1 . 5.2 ) fixed to the transport carriage ( 3 ) and the rail running surfaces with an over the range of the waiting position of the geometry-determining rolling body ( 5.1 ) are provided extending recess. Transport carriage according to claim 3, characterized in that the rail running surfaces with a groove-like, in the waiting position of the geometry-determining rolling body ( 5.1 ) of each of them, leaving an air gap ( 10 ) spaced well ( 9 ) are provided. Transport carriage according to one of the preceding claims, characterized in that the geometry-determining and the auxiliary rolling bodies ( 5.1 . 5.2 ) are actively driven. Transport carriage according to one of the preceding claims, characterized in that the geometry-determining and the auxiliary rolling bodies ( 5.1 . 5.2 ) in each case one behind the other on the same guide rail ( 6 ) are positioned. Transport carriage according to claim 6, characterized in that the auxiliary rolling bodies ( 5.2 ) in the direction of the waiting position offset to the geometry-determining rolling bodies ( 5.1 ) on the transport carriage ( 3 ) are arranged. Transport carriage according to one of the preceding claims, characterized in that the transport carriage ( 3 ) with four identical rolling elements (one exposed in the waiting position and one fully loaded) 5.1 . 5.2 ) existing role combinations ( 5 ) is equipped.