GB2119309A

GB2119309A - Transportable, automatically operable machining apparatus for large circular workpieces

Info

Publication number: GB2119309A
Application number: GB08301873A
Authority: GB
Inventors: Friedrich Krieger
Original assignee: GG Noell GmbH
Current assignee: GG Noell GmbH
Priority date: 1982-03-12
Filing date: 1983-01-24
Publication date: 1983-11-16
Also published as: FR2523014A1; GB2119309B; JPS58165949A; GB8301873D0; BR8206264A; DE3209022C2; DE3209022A1; AR228527A1

Abstract

An annular guide track (2) is disposable inside the workpiece (1) to be machined and a machining device (7) is movable on the guide track (2). The machining device (7) comprises three guide means (4, 5, 6), one of which guide means (6) is disposed on an arm (9) adjustable with respect to its length and the other two guide means (4, 5) are pivotally disposed. The machining device (7) is further equipped with a tool receiving head (12, 13, 14) which can be shifted in a vertical and a horizontal direction and which can be pivoted about its longitudinal axis. The tool receiving head may be provided with a sawblade 11, a grinding wheel, a milling tool or a drill. <IMAGE>

Description

SPECIFICATION Transportable, automatically operable machining apparatus for large circular workpieces The present invention relates to a transportable, automatically operable machining apparatus for large circular workpieces.

In the past, considerable expenditure was necessaryforthe automatic machining of large circular workpieces, which expenditure is further increased the larger the workpiece to be machined becomes. In the case of very large workpieces, machining thereof with automatically operable machines is not economically viable.

It is an object of the present invention to provide an economical, automatically operable machining apparatus.

According to the present invention there is provided a transportable, automatically operable machining apparatus for large circular workpieces, comprising a circular guide track disposable inside the workpiece to be machined and a machining device movable on the guide track.

A machining apparatus is thus provided which is simple and economical in its basic construction for use on large, and even very large, workpieces.

One advantageous embodiment of the invention resides in the fact that the machining device comprises three guide means distributed over the circumference of the guide track.

A further advantageous embodiment of the invention is provided when the machining device comprises two guide means distributed over the circumference of the guide track and one guide means formed as a central bearing.

A further feature of the invention resides in the fact that one of the guide means is provided on an arm which is adjustable with regard to its length and the other two guide means are pivotable. A particularly economical solution is thereby provided because one and the same machining device can be used for different sized workpieces.

A further feature of the invention resides in the fact that the machining device comprises a tool receiving head which can be displaced in a horizontal and vertical direction and pivoted about its longitudinal axis. A device is thus produced which is compact and hence space saving and economical while being highly movable.

A further embodiment of the invention resides in the fact that pressure cylinders support the guide track on the wall of the workpiece to be machined.

This is not only economical because separate foundation supports are not needed but the machining vibrations are therefore also kept to a minimum.

It is particularly advantageous when the pressure cylinders are in the form of piston-and-cylinder arrangements.

Also in accordance with the invention there is provided a method for machining large circular workpieces comprising providing a circular guide track having a diameter less than the inner diameter of the circular workpiece to be machined; attaching the circular guide track to the inside of the circular workpiece to be machined; and movably positioning a machining device on the guide track.

The present invention will be further illustrated by way of example with reference to the accompanying drawings, in which: Figure 7 is a sectional lateral view of a machining apparatus disposed inside a container; and Figure 2 is a sectional view of the machining apparatus taken along the line A-A of Figure 1.

A container 1 is to be severed with the machining apparatus of the invention by sawing. A circular or annular guide track 2 is disposed inside the container 1 and is supported on the wall of the container 1 via a plurality of piston-and-cylinder arrangements 3 distributed over the circumference of the guide track 2. A machining device 7 is arranged so as to be movably by means of wheels 8 via three guide means 4, 5, 6 distributed over the circumference of the guide track 2. The guide means 6 is disposed on an arm 9, which comprises two telescopic parts, the longitudinal displacement being effected by a rotary spindle 10. The guide means 4, 5 are pivotally or tiitably mounted. The machining device 7 can be adapted to the various diameters of the guide track 2 by the arm 9 which is adjustable in respect of its length and by the pivotal guide means 4, 5.A saw blade 11 is provided for the machining of the workpiece, which saw blade 11 is attached to a tool receiving head, which comprises a horizontally displaceable member 12, a vertically displaceable member 13 and a member 14which is pivotal about its longitudinal axis. A motor 15 is provided for driving the saw blade 11. The horizontal displace mentofthe member 12 is performed at a guide rod 16 bya drive 17. The vertical displacementofthe member 13 is performed at guide rod 18 by a drive 19. The pivotal movement of the member 14 about its longitudinal axis is effected via bearing 20 by a drive 21. A motor 22 provides the drive powerfor moving the machining device 7 on the guide track 2.

Depending on the type of machining desired, the tool receiving head may also be provided with a grinding wheel, a milling tool or a drill instead of the saw blade 11.

1. Atransportable, automatically operable machining apparatus for large circular workpieces, comprising a circular guide track disposable inside the workpiece to be machined and a machining device movable on the guide track.

2. A machining apparatus as claimed in claim 1, in which the machining device comprises three guide means distributed over the circumference of the guide track.

3. A machining apparatus as claimed in claim 1, in which the machining device comprises two guide means distributed over the circumference of the guide track and a third guide means formed as a central bearing.

4. A machining apparatus as claimed in claim 2 or 3, in which one guide means is located on an arm which is adjustable in respect of its length and the other two guide means are pivotally mounted.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Transportable, automatically operable machining apparatus for large circular workpieces The present invention relates to a transportable, automatically operable machining apparatus for large circular workpieces. In the past, considerable expenditure was necessaryforthe automatic machining of large circular workpieces, which expenditure is further increased the larger the workpiece to be machined becomes. In the case of very large workpieces, machining thereof with automatically operable machines is not economically viable. It is an object of the present invention to provide an economical, automatically operable machining apparatus. According to the present invention there is provided a transportable, automatically operable machining apparatus for large circular workpieces, comprising a circular guide track disposable inside the workpiece to be machined and a machining device movable on the guide track. A machining apparatus is thus provided which is simple and economical in its basic construction for use on large, and even very large, workpieces. One advantageous embodiment of the invention resides in the fact that the machining device comprises three guide means distributed over the circumference of the guide track. A further advantageous embodiment of the invention is provided when the machining device comprises two guide means distributed over the circumference of the guide track and one guide means formed as a central bearing. A further feature of the invention resides in the fact that one of the guide means is provided on an arm which is adjustable with regard to its length and the other two guide means are pivotable. A particularly economical solution is thereby provided because one and the same machining device can be used for different sized workpieces. A further feature of the invention resides in the fact that the machining device comprises a tool receiving head which can be displaced in a horizontal and vertical direction and pivoted about its longitudinal axis. A device is thus produced which is compact and hence space saving and economical while being highly movable. A further embodiment of the invention resides in the fact that pressure cylinders support the guide track on the wall of the workpiece to be machined. This is not only economical because separate foundation supports are not needed but the machining vibrations are therefore also kept to a minimum. It is particularly advantageous when the pressure cylinders are in the form of piston-and-cylinder arrangements. Also in accordance with the invention there is provided a method for machining large circular workpieces comprising providing a circular guide track having a diameter less than the inner diameter of the circular workpiece to be machined; attaching the circular guide track to the inside of the circular workpiece to be machined; and movably positioning a machining device on the guide track. The present invention will be further illustrated by way of example with reference to the accompanying drawings, in which: Figure 7 is a sectional lateral view of a machining apparatus disposed inside a container; and Figure 2 is a sectional view of the machining apparatus taken along the line A-A of Figure 1. A container 1 is to be severed with the machining apparatus of the invention by sawing. A circular or annular guide track 2 is disposed inside the container 1 and is supported on the wall of the container 1 via a plurality of piston-and-cylinder arrangements 3 distributed over the circumference of the guide track 2. A machining device 7 is arranged so as to be movably by means of wheels 8 via three guide means 4, 5, 6 distributed over the circumference of the guide track 2. The guide means 6 is disposed on an arm 9, which comprises two telescopic parts, the longitudinal displacement being effected by a rotary spindle 10. The guide means 4, 5 are pivotally or tiitably mounted. The machining device 7 can be adapted to the various diameters of the guide track 2 by the arm 9 which is adjustable in respect of its length and by the pivotal guide means 4, 5.A saw blade 11 is provided for the machining of the workpiece, which saw blade 11 is attached to a tool receiving head, which comprises a horizontally displaceable member 12, a vertically displaceable member 13 and a member 14which is pivotal about its longitudinal axis. A motor 15 is provided for driving the saw blade 11. The horizontal displace mentofthe member 12 is performed at a guide rod 16 bya drive 17. The vertical displacementofthe member 13 is performed at guide rod 18 by a drive 19. The pivotal movement of the member 14 about its longitudinal axis is effected via bearing 20 by a drive 21. A motor 22 provides the drive powerfor moving the machining device 7 on the guide track 2. Depending on the type of machining desired, the tool receiving head may also be provided with a grinding wheel, a milling tool or a drill instead of the saw blade 11. CLAIMS

5. A machining apparatus as claimed in any preceding claim, in which the machining device additionally comprises a tool receiving head which is displaceable in a vertical and horizontal direction and is pivotable about its longitudinal axis.

6. A machining apparatus as claimed in any preceding claim, in which pressure members support the guide track on the wall of the workpiece to be machined.

7. A machining apparatus as claimed in claim 6, in which the pressure members are in the form of piston-and-cylinder arrangements.

8. A transportable, automatically operable machining apparatus, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

9. A method for machining largecircularworkpieces, comprising providing a circular guide track having a diameter less than the inner diameter of the circular workpiece to be machined; attaching the circular guide track to the inside of the circular workpiece to be machined; and movably positioning a machining device on the guide track.

10. A method as claimed in claim 9 further comprising adjusting the diameter of a support piece of the machining device for restraining the machining device motion to the guide track path.

11. A method as claimed in claim 9 further comprising tilting a support piece of the machining device for providing a fit between the machining device and the guide track.

12. A method as claimed in claim 9, 10 or 11 further comprising moving a tool head of the machining device in a horizontal and in a vertical direction.

13. A method as claimed in claim 9, 10, 11 or 12 further comprising pressurizing pressure members for solidly supporting the guide track against the wall of the large circular workpiece.

14. A method as claimed in claim 13 further comprising providing the pressure members as fluid operated jacks.

15. A method for machining iarge circular work- pieces as claimed in any one of claims 9 to 14, substantially as hereinbefore described and illustrated.