Cutting – Processes
Patent
1986-12-01
1988-11-15
Kazenske, E. R.
Cutting
Processes
83169, 83171, 83469, 83594, 83676, 83792, 83835, 30369, B23D 5900
Patent
active
047840293
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This U.S. application stems from PCT International Application No. PCT/SE86/00148filed Apr. 1, 1986.
The present invention relates to a sawing method, and a device for utilization of the method.
It is previously known to cut various types of workpieces with saws including a saw blade having a continous linear movement, such as a bandsaw, and with saw wheels having a continous rotary movement, such as rotary saws. These previously known sawing methods are particularly well suited for workpieces having a solid cross-section, but may also be used for tubular or profiled workpieces of a material and with a wall thickness adapted to resist the plastical deformation imposed by the forces applied during a sawing operation. Sawing of workpieces, which are deformed by the forces applied by a saw blade or saw wheel, may be carried out if the sawing operation is performed using a supporting part, and for example, a thin-walled tube can be sawn by arranging a wooden stave having a diameter corresponding to the internal diameter of the tube located embraced by the tube at the point where the sawing operation is about to take place, but the supporting part will also be sawn off at the same time. For certain applications, rotary wheels, coated with a grinding material, are utilized as replacement for a saw wheel, and the workpiece is thus cut by means of a grinding cutting operation, which results in a high temperature during the operation, and formation of scale and burrs, and thus also normally a subsequently following operation in order to receive an acceptable cut surface. Furthermore, such a cutting grinding operation requires that the workpiece has necessary resistance against plastical deformation, since cutting by means of a grinding method results in application of relatively large deforming forces on the workpiece.
The object of the present invention is to disclose a previously unknown sawing method, which facilitates sawing of extremely thin-walled workpieces with a minimum of plastical deformation, and also sawing of thin-walled tubes and profiled workpieces without any supporting parts of previously mentioned type being required. The method according to the invention makes it further possible to achieve an extremely favourable cut surface, which only rarely requires further machining by deburring, and the risk for a saw wheel or blade to "seize" the workpiece, and thus result in throwing and risk for injuries on the operator, is also eliminated. The present invention also relates to a device for utilization of the method.
The method according to the present invention is mainly characterised in that two saw blades or saw wheels are arranged located in an adjacent relationship to each other with the operative direction for associated saw teeths in an opposed relationship to each other, and that each saw blade or saw wheel is caused to perform a continous movement in opposite directions to each other in the operative direction for each saw blade or saw wheel, and that the saw blades or the saw wheels in a common an co-acting operation take up a saw cut in a workpiece.
The present invention is more fully described below with reference to the accompanying drawings, in which:
FIG. 1 shows two portions of two each other adjacently located saw blades, intended to perform a continous movement in two opposed directions in relation to each other, as indicated by arrows.
FIG. 2 show portions of two each other adjacently located saw wheels, intended to perform a continous and in relation to each other opposed rotary movement.
FIG. 3 shows an example of how two saw teeths take up contact with a workpiece.
FIG. 4 shows a cross-sectional view IV--IV of part of the saw wheels shown in FIG. 2.
FIG. 5 shows a first embodiment with regard to how two saw wheels can be arranged supported by means of two in opposite directions in relation to each other revolving drive shafts.
FIG. 6 shows a second embodiment with regard to how two saw wheels can be arranged supported by means of two in oppo
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Jones Eugenia A.
Kazenske E. R.
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