Vibration state detecting method at machining stage of work and/or tool

• US 7,874,214 B2
• Filed: 01/15/2008
• Issued: 01/25/2011
• Est. Priority Date: 05/01/2007
• Status: Active Grant

• Current Assignee: Matsuura Machinery Corporation
• Original Assignee: Matsuura Machinery Corporation
• Inventors: Arakawa, Hiroshi, Amaya, Kouichi, Fujita, Masaru
• Primary Examiner(s): Williams; Hezron
• Assistant Examiner(s): Shah; Samir M
• Application Number:
  US12/014,305
• Publication Number:
  US 20080271530A1
• Time in Patent Office: 1,106 Days
• Field of Search: 735/77, 735/79, 735/84, 736/00, 736/02, 736/27, 736/45, 736/46, 736/49, 736/63
• US Class Current: 73/663
• CPC Class Codes: G05B 19/401 characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes G05B19/19 takes precedence
• CPC Class Codes: G05B 19/404 characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia G05B19/19, G05B19/41 take precedence
• CPC Class Codes: G05B 2219/37349 Unbalance of tool or tool holder
• CPC Class Codes: G05B 2219/37351 Detect vibration, ultrasound
• CPC Class Codes: G05B 2219/37434 Measuring vibration of machine or workpiece or tool
• CPC Class Codes: G05B 2219/37435 Vibration of machine
• CPC Class Codes: G05B 2219/49177 Runout, eccentricity, unbalance of tool or workpiece

Abstract

A vibration state detecting method at a machining stage of a work and/or tool, includes the steps of mounting the work and/or tool on a predetermined rotational device and measuring a deviation size and/or deviation average speed corresponding to each rotational number of the work and/or tool; presetting the deviation size and/or the deviation average speed measured by using the rotational device, a vibration amplitude and/or vibration average speed when each machine tool having a work and/or tool mounted thereon is rotated, with a common unbalance amount and at a rotational speed, and proportional fixed number of both thereof; and calculating a vibration amplitude and/or vibration average speed corresponding to each number of rotations when the work and/or tool is mounted on each machine tool by using a measurement value of the deviation size and/or deviation average speed of using rotational device, and the proportional fixed number.

Claims

1. A vibration state detecting method at a machining stage of at least one of a work and a tool for detecting a vibration state which is brought about due to unbalance of the at least one of the work and the tool mounted on a machine tool and rotating, comprising the steps of:

mounting the at least one of the work and the tool on a predetermined rotational device;

optically measuring at least one of a deviation size and deviation average speed corresponding to each number of rotations of the at least one of the work and the tool;

presetting, in a prior test,

at least one of the deviation size and the deviation average speed measured by using the rotational device, and

at least one of a vibration amplitude and vibration average speed when each machine tool having the at least one of the work and the tool mounted thereon is rotated, with a common unbalance amount and at a rotational speed, and proportional fixed number of both thereof; and

calculating at least one of a vibration amplitude and vibration average speed corresponding to each number of rotations when the at least one of the work and the tool is mounted on each machine tool by using at least one measurement value of the at least one of deviation size and deviation average speed by using the rotational device, and the proportional fixed number.

2. The vibration state detecting method according to claim 1, further comprising the steps of:

mounting the rotational device on a predetermined table, and

measuring at least one of a deviation size and deviation average speed of one of the following;

the table,

a plate on the table, and

a pole secured to the table.

3. The vibration state detecting method according to claim 2, further comprising the steps of:

coupling together a ball screw having a rotating probe secured thereto and the table, and

measuring at least one of the deviation size and deviation average speed in terms of reciprocal vibration of the rotating probe.

4. A vibration state detecting method at a machining stage of a work for detecting a vibration state which is brought about due to unbalance of a work mounted on a machine tool and rotating, comprising the steps of:

mounting at least one of the work and the tool on a predetermined rotational device;

measuring at least one of a deviation average speed and deviation size corresponding to a number of rotations of the at least one of the work and the tool with electromagnetic induction;

premeasuring, in a prior test,

at least one of the deviation average speed and deviation size measured by the rotational device, and

at least one of a vibration amplitude and vibration average speed when each machine tool having the at least one of the work and the tool mounted thereon is rotated, with a common unbalance amount and at a rotational speed, and proportional fixed number thereof; and

calculating at least one of a vibration amplitude and vibration average speed corresponding to each number of rotations when the at least one of the work and the tool is mounted on each machine tool by using at least one measurement value of the at least one of deviation average speed and deviation size with the use of the rotational device, and the proportional fixed number.

5. The vibration state detecting method at a machining stage of the work according to claim 4, further comprising the steps of:

mounting the rotational device on a table having a plurality of magnets, and

securing power generating coils near the magnets in connection to one another in association with the respective magnets, to thereby measure at least one of a deviation average speed and deviation size of the table.

6. The vibration state detecting method at a machining stage of the work according to claim 4, further comprising the steps of:

coupling together a ball screw having a rotating magnet secured thereto and a table,

disposing a fixed coil around the rotating magnet, and

measuring at least one of a deviation average speed and deviation size of the table in a direction of the ball screw in terms of an amount of power generated from the fixed coil due to a reciprocal vibration of the rotating magnet.

7. A vibration state detecting method at a machining stage of a work for detecting a vibration state which is brought about due to unbalance of a work mounted on a machine tool and rotating, comprising the steps of:

mounting at least one of the work and the tool on a predetermined rotational device;

optically measuring a deviation size and deviation average speed corresponding to a number of rotations of the at least one of the work and the tool, the deviation average speed being measured with electromagnetic induction;

premeasuring, in a prior test,

the deviation size and the deviation average speed measured by the rotational device, and

a vibration amplitude and vibration average speed when each machine tool having the at least one of the work and the tool mounted thereon is rotated, with a common unbalance amount and at a rotational speed, and proportional fixed number thereof; and

calculating a vibration amplitude and vibration average speed corresponding to each number of rotations when the at least one of the work and the tool is mounted on each machine tool by using at least one measurement value of at least one of the deviation size and deviation average speed with the use of the rotational device, and the proportional fixed number.

8. The vibration state detecting method according to claim 7, wherein:

the step of measuring the deviation size, includes the steps of;

mounting the rotational device on a predetermined table, and

measuring the deviation size of one of the following;

the table,

a plate on the table, and

a pole secured to the table; and

the step of measuring the deviation average speed includes the steps of;

mounting the rotational device on the table having a plurality of magnets, and

securing power generating coils near the magnets in connection to one another in association with the respective magnets, to thereby measure at least one of a deviation average speed and deviation size of the table.

9. The vibration state detecting method according to claim 7, wherein:

the step of measuring the deviation size, includes the steps of;

coupling together a ball screw having a rotating probe secured thereto and a table, and

measuring at least one of the deviation size and deviation average speed in terms of reciprocal vibration of the rotating probe; and

the step of measuring the deviation average speed includes the steps of;

mounting the rotational device on a table having a plurality of magnets, and

securing power generating coils near the magnets in connection to one another in association with the respective magnets, to thereby measure the deviation average speed of the table.

10. The vibration state detecting method according to claim 7, wherein:

the step of measuring the deviation size, includes the steps of;

mounting the rotational device on a predetermined table, and

measuring the deviation size of one of the following;

the table,

a plate on the table, and

a pole secured to the table; and

the step of measuring the deviation average speed includes the steps of;

coupling together a ball screw having a rotating magnet secured thereto and the table, and

disposing a fixed coil around the rotating magnet, and whereby

measuring at least one of a deviation average speed and deviation size of the table in a direction of the ball screw in terms of an amount of power generated from the fixed coil due to a reciprocal vibration of the rotating magnet.

11. The vibration state detecting method according to claim 7, wherein:

the step of measuring the deviation size, includes the steps of;

coupling together a ball screw having a rotating probe secured thereto and a table, and

measuring at least one of the deviation size and deviation average speed in terms of reciprocal vibration of the rotating probe; and

the step of measuring the deviation average speed includes the steps of;

coupling together a ball screw having a rotating magnet secured thereto and the table, and

disposing a fixed coil around the rotating magnet, and whereby

measuring at least one of a deviation average speed and deviation size of the table in a direction of the ball screw in terms of an amount of power generated from the fixed coil due to a reciprocal vibration of the rotating magnet.