Process for manufacturing of workpieces, especially workpieces o

Details Process for manufacturing of workpieces, especially workpieces o Process for manufacturing of workpieces, especially workpieces o

1992-02-25

1995-07-25

Howell, Daniel W.

Gear cutting, milling, or planing

Milling

Process

408 1R, B23C 300

Patent

active

054356741

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for manufacture of workpieces having additional characteristics, and also to a device especially well suited for application of the process.
The report "Flexible Manufacture of Series Produced Diesel Engines" published in VDI-Zeitschrift, Volume 126 (1984), No 9, May, pages 311 et seq. presents a manufacturing process, together with a flexible manufacturing system for machining modifications of a diesel engine used in various vehicle models. The basic plant layout is that of flexible interlinking with crossover and outward transfer stations for palettes carrying workpieces.
Cylinder heads and cylinder blocks of engines are machined by cutting with the workpiece handling and machine system employed. At an upstream clamping station the workpieces are clamped in a preselectable chuck on a workpiece carrier and then taken to individual machining stations. The numeral 9 identifies a machining station that is very flexible from the viewpoint of machining options but very costly from that of design. This machining center has three arbors associated with specific tools, while a fourth arbor is mounted on an indexing table and a fifth arbor in an indexing table swiveling device. All the machining operations involved in the system can be performed alternatively with this five-arbor machining center.
The report stresses as a particular advantage that this layout permits prompt conversion to new component alternatives with relatively low investment cost. This flexibility of machining is achieved by means of machining centers and a flexible conveying system.
On the whole the crossover and outward transfer stations of the factory in question correspond to the bypass lines of other state-of-the art equipment for series production of drive assemblies, which are required if, for example, in-line and V engines are to be manufactured by means of common equipment. It is a question in this instance of manufacturing plants in which either in-line-specific or to V-specific production areas extend over the bypass lines, so that only a very few component areas extend over the common production equipment itself. The machining-specific differences in parts family members are generally reconciled by the different and specifically adapted arrangement of the production stations on the bypass lines or outward transfer stations. Consequently, a large number of bypass lines or machining stations and for the most part costly machine arrangements at the machining stations are generally required. The drive assemblies, resting on one of their sides, that is, with their horizontal axis extending horizontally, are delivered to these stations.
Although the manufacturing plant described in the foregoing does provide the possibility of widening the range of models to be manufactured, it involves loss of its transfer line nature. That is to say, this plant is not suited for high output mass production geared for manufacture of a large number of pieces, as is customary on transfer lines, because high investment costs and a large amount of space are required, so that the cost effectiveness is lowered.
In the case of the last mentioned production equipment, that is, transfer lines, such as are described in FR-A 26 27 120, for example, not every workpiece has a workpiece carrier of its own assigned to it. These workpieces rather rest directly on a conveying system (chain conveyors, roller conveyors, or the like) and are not immobilized and clamped until they reach the individual machining stations. The production equipment is assigned or subordinated to the workpiece. The adapted layout of the production equipment is necessarily determined on the basis of a uniform workpiece clamping position. The result often is that a costly position oblique to the machine bed must be selected.
FR-A 26 27 120 describes the manufacture of a vehicle drive assembly that has lateral surfaces extending more or less parallel to a longitudinal axis and frontal surfaces more or less perpendicular to this axis and, while standing on a latera

REFERENCES:
patent: 2808746 (1957-10-01), Blomquist
patent: 4309600 (1982-01-01), Perry et al.
patent: 4603456 (1986-08-01), Hiroyasu et al.
patent: 4629384 (1986-12-01), Beshke

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