Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1995-08-28
1998-02-17
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
29234, 29235, B23P 1102
Patent
active
057180326
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for joining a pliable, tubular joining component to one end of a base component. The invention furthermore relates to a device for carrying out such a method.
The joining of so-called pliable, tubular components such as, for example, hoses or seals, represents a considerable obstacle to automation in the assembly sector. Such elongate and hollow components, which may possibly be (partly) curved or conical, are predominantly assembled by hand.
In the production of infusion equipment, a cylindrical or else conical transition piece made of latex rubber is pushed manually over one end of an infusion tube or infusion hose and an adaptor piece. This operation for joining the transition piece to the slightly larger joining member lasts for between 10 and 25 seconds, depending on the dexterity of the worker. By lubricating the joining members, for example with a water/alcohol mixture, the required assembly time can be reduced, although more than 4 seconds are still needed.
SUMMARY OF THE INVENTION
The invention is based on the object of providing a method which permits an automatic, quick and reliable operation for joining the abovementioned components.
The stated object is achieved according to the invention in that the following steps are performed: component and the base component are aligned coaxially, that the distance between the gripping tool and the workpiece holder is reduced, delivery means for the purpose of widening that end of the joining component facing the base component,
The joining component is widened abruptly by the compressed air, so that the end of the base component can be pushed in. Thus, an automated joining operation is achieved which is assisted by compressed air and which is also suitable, for example, for base components whose conical end has in part a greater external diameter than the internal diameter of the pliable, tubular joining component. The assembly time is reduced to less than 2 seconds. It is no longer necessary to lubricate the members which are to be joined.
In a device for carrying out the method according to the invention the coaxial delivery of compressed air permits in a simple manner the widening of that end of the joining component facing towards the base component.
According to a preferred embodiment of the invention, in which the base component has a central recess, the compressed air is introduced into the workpiece holder via the central recess of the base component for the purpose of generating a compressive force which acts on that end of the joining component remote from the base component, is directed towards the base component and additionally shoots the joining component towards the base component and pushes it onto the latter. The widened part of the joining component in this case bears on the edge of the workpiece holder, so that the joining component is not pressed back again when the base component is pushed in. In this way, by means of the combination of widening and pressing, a still quicker and more reliable joining operation is obtained.
According to an embodiment of the invention, the gripping tool has a guide sleeve which surrounds the conical end of the base component with clearance. This sleeve prevents the pliable joining part from catching and as a result inflating like a balloon during joining. Thus, a more reliable joining operation is ensured.
BRIEF DESCRIPTION OF THE DRAWINGS
An illustrative embodiment of the invention is explained in more detail hereinbelow with reference to the drawings, in which:
FIG. 1 shows a section through a first embodiment of the device according to the invention,
FIG. 2 shows a section through another embodiment of the device according to the invention in the standby phase,
FIG. 3 shows a section corresponding to FIG. 2, but in the contact phase, and
FIG. 4 shows a section through another embodiment of the device according to the invention.
DETAILED DESCRIPTION
FIG. 1 shows a first embodiment of a device according to the invention for joinin
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Bryant David P.
Emporia Maschinen AG
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