Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – With means for cutting tubular workpiece
Patent
1989-05-26
1990-08-14
Kastler, S.
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
With means for cutting tubular workpiece
266 48, B23K 704
Patent
active
049481010
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for making divergent cuts chamfered relative to a cutting surface, e.g. welding chamfers, by means of torch cutting, especially in the internal cutting of cylindrical sheets, such as pipes.
In industrial manufacturing, the cutting of pieces, the removal of pieces from a sheet, the cutting off of profiled irons and pipes and like require not only the cutting but also a chamfer for welding. There are several different means and devices for producing chamfers in free space but those cannot be applied to the internal cutting of rather small pipes by using a cutting torch guide disclosed in Patent application W086/04003. According to its operating principle, this prior art cutting torch guide carries a torch along the internal wall of a cylindrical jacket at a set working distance from the wall.
An object of the invention is to provide an apparatus for varying the inclination of the cutting direction of the burner head of a cutting torch while the path of the tip portion of said burner head follows a desired cutting line.
This object is achieved by means an apparatus of for making divergent cuts chamfered relative to a cutting surface by means of torch cutting in the internal cutting of cylindrical sheets. The apparatus includes a torch mounted on a fastening arm at the end of a carrier arm, the carrier arm being adapted to be axially movable and rotatable around its axis. The fastening arm at the end of the carrier arm is fitted with a transverse support arc provided with an element movable along an arcuate path and fitted with a longitudinal support arc which is provided with a mounting plate for the torch. The mounting plate is movable along an arcuate path whereby the radii of the arcuate paths of the support arcs are equal and their centers are equally far from the center line of the carrier arm at an axial distance from each other.
The invention will now be described in more detail with reference made to the accompanying drawings, in which
FIG. 1 shows an apparatus of the invention in a schematic perspective view,
FIG. 2 shows a structural component of the apparatus of FIG. 1 as seen from the front,
FIG. 3 is a section of the structural component of FIG. 2 along a line 3--3,
FIG. 4 is a section of the structural component of FIG. 2 along a line 4-4,
FIG. 5 illustrates an application of the invention to the cutting of a cylindrical surface, and
FIG. 6 shows a section through FIG. 5 along a line 6--6.
As shown in FIG. 1, the apparatus of the invention comprises a block 15 secured to a fastening arm 2 at that end of a carrier arm 1 which is closer to a torch 8, said block 15 being fitted with a transverse support arc 3 provided with an element 4 traveling along an arcuate path. To said moving element 4 is secured a block 16 fitted with a longitudinal support arc 5 provided with a mounting plate 6 for a torch 8, said plate traveling along an arcuate path. The radii of the arcuate paths of support arcs 3, 5 are equal and their centers are equally far from the center line of carrier arm 1 at an axial distance from each other.
The traveling path of moving element 4 runs preferably in the same direction as the rim of transverse support arc 3, the plane of said traveling path being perpendicular to the center line of the carrier arm. On the other hand, the traveling path of moving mounting plate 6 runs preferably in the same direction as the rim of longitudinal support arc 5, the plane of this traveling path being parallel to the vertical plane of carrier arm 1.
The moving element 4 and the moving mounting plate 6 each has its own shifting mechanism, whereby said moving elements 4, 6 can be independently adjusted. The shifting mechanisms are both identical, comprising a driving cable 9, a driving cable inlet 14, driving cable reversing wheels 10, a driving cable fastening means 11 for securing the driving cable to moving element 4, 6, as well as guide tracks 12 with their guide wheels 13 (FIGS. 2-4).
In one preferred embodiment of an apparatus of the invention, a drive
REFERENCES:
patent: 1692924 (1928-11-01), Brown
patent: 4162383 (1979-07-01), Hamasaki
patent: 4667936 (1987-05-01), Hale, Jr.
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