Control device and machine tool

#This application claims the benefit of Japanese Patent Application No. 2019-062890, the content of which is incorporated herein by reference.

#The present invention relates to a control device and a machine tool.

#In the related art, a machine tool that has an interference checking function in order to prevent the respective portions of a tool, a table, a jig, a workpiece, and the like from unintendedly interfering with each other is known (see Japanese Unexamined Patent Application, Publication No. 2010-231737; Japanese Unexamined Patent Application, Publication No. 2009-116505; and Japanese Unexamined Patent Application, Publication No. 2003-305625, for example).

#FIG. 1 is a front view of a machine tool according to an embodiment.

#FIG. 2 is a block diagram of the machine tool in FIG. 1.

#FIG. 3 is a view for explaining parameters related to the tool.

#Hereinafter, a machine tool 1 according to an embodiment will be described with reference to the drawings. The machine tool 1 includes a table 2 to which a workpiece W is secured, a spindle 3 that holds a tool 20, and a tool magazine 4 that accommodates a plurality of tools 20 as illustrated in FIG. 1. The machine tool 1 further includes a spindle motor 5 that causes the spindle 3 to rotate about a longitudinal axis of the spindle 3, a plurality of feeding motors 6 that cause the table 2 and the spindle 3 to relatively move, and a control device 7 that controls the spindle motor 5 and the feeding motors 6 as illustrated in FIG. 2.

#Each tool 20 includes an edged tool portion 21 that comes into contact with the workpiece W and works the workpiece W, and a holder portion 22 that holds a proximal end portion of the edged tool portion 21 as illustrated in FIG. 3. The edged tool portion 21 has various shapes and dimensions in accordance with types. The holder portion 22 includes a flange portion 23 projecting outward in a radial direction and typically has a maximum diameter at the flange portion 23. The shape and the dimension of the flange portion 23 are determined by standards and are common among the plurality of tools 20. The holder portion 22 is held by the spindle 3 at a shank portion that is closer to the proximal end side than the flange portion 23 is.

#The tool magazine 4 is a turret type, for example. The machine tool 1 has an automatic tool replacing function which automatically replaces the tools 20 between the tool magazine 4 and the spindle 3. The tool magazine 4 has a plurality of tool holding portions 4a capable of respectively holding the tools 20. A tool identification unit such as an RFID that reads identification information of the tools 20 in the respective tool holding portions 4a is provided at the tool magazine 4. The identification information of the tools 20 is transmitted from the tool identification unit to the control device 7 and is then associated with positions of the tool holding portions 4a and stored in a storage unit 11. The identification information of the tools 20 in the respective tool holding portions 4a may be input to the control device 7 by an operator.