IE46353B1

IE46353B1 - Apparatus for machining pipe bends

Info

Publication number: IE46353B1
Application number: IE246377A
Authority: IE
Original assignee: Moeller Sidro Fab
Priority date: 1976-12-04
Filing date: 1977-12-05
Publication date: 1983-05-18
Also published as: NL7713426A; ATA863777A; IE46353L; BE861484A; GB1593748A; JPS53148083A; FR2372663B1; DE2655061A1; AT369678B; IT1091575B; DD140991A2; ES465033A1; FR2372663A1

Abstract

Improvements in the machines to finish a blank part of tubular elbow manufactured in a press of tubular elbows with a radius of curvature between 15º and 180º characterized in that the frame (1) of the machine has two cylinders located on both sides at the top of each cylinder Hydraulics (7) fixedly suspended at an angle of 45º with piston rods (8) that support the motor (5 2) for driving the separation devices (5) and because under both Hydraulic cylinders (7) are arranged on an oblique sliding band (9) with an angle of equally 15º arrangements (111213) with chip removal opposite each other that can be moved upwards and guided in the frame (1) of the machine on guided carriages (10) for beveling on both sides the tubular elbow (4) overhanging edges with fair measures.

Description

PATENT APPLICATION BY (71) SIDRO ROHRBOGEN GmbH, A JOINT STOCK COMPANY ORGANISED UNDER THE LAWS OF THE FEDERAL REPUBLIC OF GERMANY, OF BORRIESSTRASSE 94-100, D-4980, BUNDE, FEDERAL REPUBLIC OF GERMANY.

Price 90p The present invention relates to a machine in which pipe bends can be finished or trimmed to required dimensions.

The production of pipe bends is well known in the art. Complete pipe bends are prepared with calculated lengths, that is to say the pipes are cut to the required lengths and are led over the bending mandrel one after the other. By this method the piece of pipe forms itself into a pipe bend.

According to the kind and the production of the materials to be used, the pipe bends emerge from the pipe bending press with a temperature between 700 and 900 degrees Celsius. Because of the method of forming, these pipe bends are not identical so far as concerns their cross section, and must be calibrated. After the calibration it is necessary to cool the pipe bends before a further operation.

After the pipe bend is sufficiently cooled, it passes into the so-called sawing station. Here the pipe bend is cut, by means of two- or three-cut saws to the required length of bend. During the cutting of the pipe bend the measurement precision always lies in the upper field of tolerance. Occasionally, this - 2Λ6353 tolerance field will be exceeded, and another additional after-operation on the pipe bend by means of further cold calibration is necessary. This cold calibration is nevertheless only an end calibration, that is to say, the ends of the pipe bend, on the above described junction measurement are brought vn'thin the tolerance field.

If now during this end calibration the angle of the pipe bend is affected, then regrinding is necessary. Regrinding will also be necessary if the pipe bend has not been precisely clamped up to the saw blade which will then make an oblique cut. All this finishing work which is necessary to keep within the prescribed tolerance limits is mainly manual work involving high cost.

Recently tolerances for pipe or tube bends used in marine engineering have been further tightened with a consequential rise in the cost of production due to the extra finishing work.

The inventor has set himself the task to so improve the machine for the complete preparation of pipe bends that as well as the hot calibration and possible chamfering there can be a de-burring of the correctly dimensioned pipe bend ends.

According to the invention we provide an apparatus for machining a pipe bend blank, said apparatus comprising a frame, a die set mounted on the frame for receiving and hot calibrating a pipe bend blank, and four machining tools mounted on said frame which are movable with respect to the die set, two of said machining tools disposed above and to the side of the die set being formed by motor-driven trimming means which are displaceable by means of pressure cylinders in a direction for effecting a trimming movement transversely of the ends of the pipe bend, and two machining tools being arranged beneath and to the side of the die set and being formed by motor-driven chamfering tools which are displaceable along inclined slideways in the direction of the pipe ends respectively, whereby following the trimming to size of the pipe bend actuation of the - 3 46353 chamfering tools effects chamfering of the pipe ends. , .

The invention will now be described by way of example with reference to the accompanying drawing which shows the apparatus in front elevation. L The apparatus comprises an upright die 2 in a machine frame f. Two/trimming devices 5 are arranged to move diagonally from the top to the bottom.

An electric motor 52 provided with a trimming tool 6 is here carried by a piston rod 8 of a hydraulic cylinder 7.

For the formation of a chamfer for subsequent trouble-free seam welding there are provided in the machine frame1 suitable cutting devices. These cutting devices are guided by means of slides 10 on inclined slide-ways 9 and each consists of a transmission gear 11 with electric motor .13, and a tool holder 12 with cutting knives 12^.

Should it be required, the translatory drive and the electric motor form a compact unit, and the slides carrying these units are hydrualically, mechanically or electrically movable on the slideway at an angle of 45° to the vertical.

The method of operation is as follows: ' The pipe behd 4, coming in glowing condition out of the pipe bend press, (not shown) is manually or mechanically taken up and laid into the die 2 arranged in the machine frame 1. For the hot calibration the two part die 2 is closed by a known means. During the calibration, the trimming devices 5 travel under the action: of the hydraulic cylinders 7 and separate the overhanging 1- ends 4 of the pipe bend 4, whereby a true and ready pipe bend 4 is obtained and needs no further working operation.

If the pipe bend edges need to be further treated, then simultaneously with the return travel· of the two trimming devices 5, there is a forward movement - 4 - - - _ _ . . --/ .46353 of the cutting devices,which means that the slides 10 with the items mounted 1 thereon, that is to say the components 11, 12, 12 and 13, are moved in the direction of the pipe bend. Rotation of the tool holder 12 will cause the 1 two cutting knives 12 to engage with the ends of the pipe bend 4 and carry out a further treatment.

The above described apparatus now makes it possible that, with a single machine, a pipe bend with a temperature of 700 to 900 degrees Celsius taken out and hot calibrated can be cut to desired dimensions and prepared for the carrying out of a good welding seam.

The advantages as compared with the known art is to be seen that the pipe bends, which are hot calibrated in the die and simultaneously chamfered at both ends, have a dimensional correctness which hitherto only could be achieved with costly subsequent operations.

In the example a pipe bend of 90° is shown. However, bends having an angle upwards of 15° may be machined on suitably adapted apparatus.

Having regard to the provisions of Section 14 of the Patents Act, 1964, attention is directed to the claims of our Patent No. 43168.

Claims

1. An apparatus for machining a pipe bend blank, said apparatus comprising a frame, a die set mounted on the frame for receiving and hot calibrating a pipe bend blank, and four machining tools mounted on said frame which are movable with respect to the die set, two of said machining tools disposed above and to the side of the die set being formed by motor-driven trimming means which are displaceable by means of pressure cylinders in a direction for effecting a trimming movement transversely of the ends of the pipe bend, and two machining tools being arranged beneath and to the side of the die set and being formed by motor driven chamfering tools which are displaceable along inclined slidewavs in the direction of the pipe ends respectively, whereby following the trimming to size of the pipe bend actuation of the chamfering - 5 4 6 3 5 3 tools effects chamfering of the pipe ends.

2. An apparatus as claimed in Claim 1, wherein each chamfering tool comprises a cutting tool holder which is driven through a transmission gear and supports at least two cutting knives which are directed towards the 5 pipe bend, the transmission and an electric motor connected thereto being . mounted as a compact unit on a slide which is displaceable on the slideway by hydraulic, mechanical or electric devices.

3. An apparatus as claimed in Claim 1 or 2, wherein all four machining tools are arranged so as to be movable at an angle of 45° to the 10 vertical.

4. An apparatus substantially as described with reference to the accompanying drawing.