Cutting – Processes
Patent
1986-01-23
1987-03-24
Yost, Frank T.
Cutting
Processes
83 58, 83 621, 83 71, 72 1, 364475, B26D 701, B26D 724
Patent
active
046516018
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a work holder-tool collision preventing device for use with numerical control equipment for a turret punch press, with which it is possible to prevent a work holder holding a workpiece and a tool from being broken down by a collision therebetween which is caused by an accidental punching operation of the tool to the work holder due to a program error or the like.
In conventional devices of this kind it is customary that a certain region directly specified by a limit switch, parameter setting or a command from a command tape is set up as an axis displacement inhibit region, thereby preventing a tool from colliding against a work holder due to a program error or the like.
However, in the case of using the limit switch, much time is needed for providing the switch and associated works. Also in the cases of the parameter setting and tape command, it is necessary for the operator to establish the inhibit region in advance by computations consuming relatively much time. Moreover, the sizes of tools which are mounted on a turret vary greatly, so that in order to minimize the inhibit region and enlarge a punching region, it is desirable to modify the inhibit region according to the size of the tool selected. However, this cannot easily be done in the case of using the limit switch and in the cases of the parameter setting and tape command, the burden on the operator will increase and a large storage capacity will be needed.
SUMMARY OF THE INVENTION
The present invention offers a solution to such defects of the prior art and has for its object to permit setting of an inhibit region corresponding to the tool being selected, by a simple operation and with a small storage capacity.
The present invention is directed to a device for preventing a selected tool on the turret from colliding with a work holder holding a workpiece for a turret punch press. The device of the present invention is provided with a work holder region storing means for storing a region occupied by the work holder in a mechanical coordinate system; a tool post shape storing means for storing the sizes of a plurality of tool posts of the turret; a punching inhibit region computing means, so that at the time of tool selection, the size of the tool post in which the selected tool is housed is read out of the tool post shape storing means and a punching inhibit region for the tool is calculated from the read-out information and the stored information of the work holder region storing means; a punching inhibit region storing means for storing the punching region; and a collision preventing means so that immediately before the execution of a punch command, it is detected whether the position of the tool is within the punching inhibit region or not and, if so, the operation of the machine is stopped and an alarm signal is generated.
With the device of the present invention, once data necessary for specifying the region occupied by the work holder in the mechanical system and information on the size of each tool post of the turret are set by the operator in a memory, an inhibit region corresponding to the size of the tool selected, is automatically set up. Accordingly, the inhibit region corresponding to the tool selected can be established by a very simple operation. Furthermore, since the inhibit region is computed and stored when the tool is selected, the storage capacity needed is small.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of the arrangement of a numerically controlled machine tool provided with the collision preventing device of the present invention;
FIG. 2 is a diagram for explaining a work holder and a punching inhibit region;
FIG. 3 is a diagram for explaining the stored contents of a RAM 4; and
FIGS. 4 and 5 are flowcharts for describing the operation of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 is a diagram illustrating the arrangement of a numerically controlled machine tool equipped with the collision preventing device of
REFERENCES:
patent: 3348440 (1967-10-01), Jensen
patent: 3603187 (1971-09-01), Bredow
patent: 4589317 (1986-05-01), Kawano
Fanuc Ltd
Yost Frank T.
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