Machine tool control device and machine tool

Patent metadata

Field	Value
Publication number	US-10007251-B2
Application number	US-201214439119-A
Country	US
Kind code	B2
Filing date	Oct 30, 2012
Priority date	Oct 30, 2012
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A machine tool control device includes a calculation unit for estimating, on the basis of the tool path for machining using a tool and information on the workpiece, the portion of the tool that forms the final machined surface. The control device also includes a feed rate-setting unit for estimating the fastest moving point, among multiple moving points contained in the portion that forms the final machined surface, for which the relative velocity of the tool with respect to the workpiece is maximum and setting the feed rates for the machine tool movement shafts so that the relative velocity of the fastest moving point is at or below a previously specified relative velocity.

First claim

The invention claimed is:

1. A control device of a machine tool which machines a workpiece while a tool is made to move relative to the workpiece, the control device comprising a microprocessor, a memory, and a storage device,
wherein the control device is configured to include:
an arithmetic unit configured to estimate a portion of the tool which finally generates a machining surface when the tool machines the workpiece based on a tool path for the tool to perform machining and information of the workpiece; and
a feed rate setting unit configured to estimate a fastest moving point at which a relative speed of the tool to the workpiece is a maximum among a plurality of moving points included in the portion which finally generates the machining surface and set a feed rate regarding a moving axis of the machine tool so that a relative speed of the fastest moving point is equal to or less than a preliminarily specified relative speed, and
wherein a plurality of relative positions of the tool to the workpiece is specified in input numerical data to be input to the arithmetic unit,
the plurality of relative positions includes a first relative position and a second relative position immediately after the first relative position, and
the feed rate setting unit estimates the fastest moving point in a movement from the first relative position to the second relative position and sets the feed rate regarding the moving axis in the movement from the first relative position to the second relative position.

2. The control device of the machine tool of claim 1 , wherein the feed rate setting unit sets the feed rate regarding the moving axis based on a length of time in which it takes the tool to move from the first relative position to the second relative position with respect to the workpiece.

3. The control device of the machine tool of claim 1 , wherein
the arithmetic unit generates a third relative position between the first relative position and the second relative position, and
the feed rate setting unit estimates the fastest moving point in a movement between two successive relative positions and sets the feed rate regarding the moving axis in the movement between the two successive relative positions.

4. A machine tool comprising:
the control device of the machine tool of claim 1 ; and
a moving device configured to make the tool move relative to the workpiece based on the feed rate set by the feed rate setting unit.

Assignees

• Makino Milling Machine

Inventors

• Masumiya Yasunori
• Suzuki Keitaro
• Suzuki Kyohei

Classifications

• G05B19/402 Primary

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• G05B19/4163 Primary

  Adaptive control of feed or cutting velocity (without NC B23Q15/12) · CPC title

• G05B19/416 Primary

  characterised by control of velocity, acceleration or deceleration (G05B19/19 takes precedence) · CPC title