Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-10-25
1992-09-15
Rose, Robert A.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51281R, 5116575, 511659, 51340, 901 22, 901 41, B24B 900, B24B 5100
Patent
active
051467143
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/CH89/00040 filed Mar. 8, 1989 and based in turn, on Swiss national application 880/88-7 filed Mar. 9, 1988 under the International Convention.
FIELD OF THE INVENTION
The present invention relates to an arrangement for cutting off excess material from castings, by means of a rotating abrasive cutting-off disk or the like, which is arranged at the free end of a multiple-arm industrial robot, via its tool holder, so that the abrasive cutting-off disk can be applied to the preestablished point of the casting.
BACKGROUND OF THE INVENTION
A considerable problem in such processes is the behavioral instability of all parts of the robot, which are in mobile interaction, so that an accurate removal of the excess material, particularly from large pieces of castings, could not be achieved in practice. U-p to now, for this reason, all machines available for this process could no be used on an industrial scale, and were abandoned in the experimental stage.
OBJECTS OF THE INVENTION
It is therefore the principal object to the present invention to provide a process for removing excess material flow casting avoiding the aforementioned drawbacks.
Another object of the present invention is to provide an arrangement for carrying out the process.
SUMMARY OF THE INVENTION
According to the invention, this is achieved due to the fact that the abrasive cutting-off disk is slidably guided a the tool holder in a linear advance direction, whereby the advance takes place as soon as the abrasive cutting-off disk is positioned at the preestablished point of the casting by adjusting means of the robot and all adjusting devices to the robot are immobilized in a rigid junction.
In tis way, since only the abrasive cutting-off disk has a linear advancement and all other adjusting devices are in a state of rigid junction, vibrations transmitted to the adjusting devices cannot have a negative effect, not even on the linear advance of the abrasive cutting-off disk, since the mentioned vibrations are strongly damped on the way to the foundation.
Correspondingly, the present invention relates to an arrangement for carrying out the process, which is characterized by a multiple-arm robot with a support arm in the form of an articulated lever, which at one end is supported in a stand so that it can swing about a horizontal and a vertical axis, and at the other end hingedly carries the tool holder which supports the abrasive cut-off disk, which advances linearly thereon via sliding means, whereby the adjusting means of the robot are hydraulic cylinders or hydraulic servomotors which can be centrally controlled and locked in position.
The construction to the support arm as a horizontally and vertically swingable articulated lever confers to the cutting tool a wide radius of action. The hinged arrangement of the cutting tool at the end of the articulated lever makes possible in a simple way the advancement of the tool in various spatial planes. The hydraulic cylinder for opening and closing the articulated lever allows an accurate positioning over a suitable control device and in addition a rigid locking in position during the finishing process.
Preferably the articulated lever is so supported in the stand, that the latter has a turntable whereon a bearing bed, swingable about a vertical axis, is supported, that in the bearing bed the articulated lever is supported swingably about a horizontal axis. For the pivoting of the bearing bed in the stand on the one hand, and of the articulated lever in the bearing bed, on the other hand, preferably also hydraulic cylinders are used.
The hinged fastening to the cutting tool can be particularly advantageous, when at the end of the free potion of the articulated lever it is fastened to a tool holder, which is swingably supported so that ti can pivot about three rotational axes which are perpendicular with respect to each other, a first of these axes running horizontally through the end of the articulated lever. Due to
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Quicker, and Safer Abrasive Cut-Off; Machinery and Production Engineering; Oct. 1987 Horton Kirby, Kent, Great Britain.
Dubno Herbert
Rose Robert A.
Wilford Andrew
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