JPH05293744A - Tool measuring method - Google Patents

Abstract

PURPOSE:To perform high-precise measurement of the size of a tool by performing relative movement of a tool and a measuring apparatus at a relatively high speed, releasing the tool and the measuring apparatus from contact with each other once after contact between the tool and the measuring apparatus is detected, and repeating operation to detect contact between the tool and the measuring apparatus a plurality of times through relative movement of the tool and the measuring apparatus at a low speed. CONSTITUTION:A tool 9 and a measuring apparatus 16 are relatively moved at a comparatively high speed to detect contact between the tool 9 and the measuring apparatus 16. After the tool 9 and the apparatus 16 are released from contact with each other, the tool 9 and the measuring apparatus 16 are relatively moved at a speed lower than a preceding relative movement speed to detect contact between the tool 9 and the measuring apparatus 16. Through repetition of above operation a plurality of times, the size of the tool 9 is measured. This method shortens a time required for relative movement of the tool 9 and the measuring apparatus 16 and besides performs high-precise measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool measuring method in a machine tool, such as a machining center, in which a plurality of pre-supplied tools are automatically exchanged for machining.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show an example of a machining center, in which 1 is a bed. A table 2 is supported by the bed 1 so as to be movable in the arrow X direction. A motor 3 is supported by the bed 1 and moves the table 2 via a screw feed mechanism (not shown). A column 4 is supported by the bed 1 so as to be movable in the arrow Y direction. A motor 5 is supported by the bed 1 and moves the column 4 via a screw feed mechanism (not shown). A spindle head (hereinafter, simply referred to as a head) 6 is supported by the column 4 so as to be movable in the arrow Z direction. A motor 7 is supported by the column 4 and moves the head 6 via a screw feed mechanism (not shown). A main shaft 8 is rotatably supported by the head 6 and is rotationally driven by a motor (not shown).

A tool 9 is detachably supported on the spindle 8. The column 10 is attached to the bed 1. 1
Reference numeral 1 is a magazine, which is supported by a column 10. A plurality of tools 9 are arranged in this magazine 11. 1
A tool changing arm 5 is supported by the column 4 and changes the tool 9 between the spindle 8 and the magazine 11. A numerical controller 12 is attached to the bed 1. An operation panel 13 is supported by the numerical controller 12 via an arm 14. 16 is a measuring instrument, which is fixed to the table 2.

When machining is performed in such a machining center, the type and number of tools 9 to be placed in the magazine 11 are determined depending on the type of the workpiece. The tools 9 arranged in the magazine 11 have different lengths and diameters. Also,
Even with the same tool 9, the length of the tool changes each time the blade is ground.

In order to perform high precision machining using such a tool 9, the length and diameter of the tool 9 are measured before the machining is started, and based on the measurement results, the table 2, the column 4 and the column 2 of the machining center are measured. It is necessary to correct the movement amount of the head 6.

Therefore, the length of the tool 9 is measured by the amount of movement of the head 6 when the tool 9 is attached to the main shaft 8 and brought into contact with the measuring device 16 fixed to the table 2. The diameter of the tool 9 is the same as the tool 9 in the magazine 1.
Before arranging to No. 1, it is measured with a measuring device such as a micrometer. Then, based on the recorded measurement results, the values are input from the operation panel 13 to the numerical controller 12.

[0007]

When measuring the length of the tool, if the moving speed of the head is high, the measurement accuracy is lowered. Further, if the moving speed of the head is slow, it takes a long time to measure, and the work efficiency is reduced. Further, the diameter of the tool does not include the amount of eccentricity of the tool itself or the amount of eccentricity of the spindle, so that the machining accuracy cannot be improved simply by measuring the tool alone.

In view of the above circumstances, an object of the present invention is to provide a tool measuring method for measuring the dimensions of a tool with high accuracy and efficiency.

[0009]

In order to achieve the above object, in the present invention, the tool and the measuring instrument are relatively moved at a relatively high speed, and after the contact between the tool and the measuring instrument is detected,
Once the contact between the tool and the measuring device is released, the tool and the measuring device are moved relative to each other at a speed slower than the relative moving speed, and the operation of detecting the contact between the tool and the measuring device is repeated a plurality of times to determine the size of the tool. taking measurement.

Further, when measuring the outer diameter of the tool, the tool is rotated in the direction opposite to that at the time of machining and brought into contact with the measuring instrument.

[0011]

Operation: That is, the tool and the measuring instrument are brought into contact with each other at a relatively high speed to detect the relative position of the tool and the measuring instrument, and the tool and the measuring instrument are once separated by a predetermined distance, and then at a relatively slow speed. By bringing the tool and the measuring instrument into contact with each other and detecting the accurate position of the tool, the relative movement time between the tool and the measuring instrument can be shortened and highly accurate measurement can be performed.

Further, when measuring the diameter of the tool, in addition to the above procedure, the tool is rotated, and the tool and the measuring device are relatively moved at a predetermined pitch for each rotation of the tool.
Since it is possible to measure the diameter of the tool including the eccentricity of the tool itself and the eccentricity of the spindle, it becomes possible to perform high-precision machining.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the flow chart shown in FIG. The components shown in FIGS. 2 and 3 are cited as the respective components. The currently recorded data of the tool 9 is displayed and confirmed on the display screen of the numerical controller 12 (step 101). Unnecessary data among the data displayed on the screen is canceled (step 102). Enter the correction value to be added to the measurement value such as the distance from the machine origin of the measuring instrument 16, the necessity of measuring the diameter of the tool 9, the length and the approximate position for the tool 9 and the measuring instrument 16 to contact each other when measuring the diameter. (Step 103). The measurement program is called (step 104). The tool 9 called by the measurement program is mounted on the spindle 8 (step 105). The motors 3 and 5 are operated to move the table 2 and the column 4, and the tool 9 and the measuring device 16 are opposed to each other (step 106).

By operating the motor 7 and lowering the head 6, the tool 9 is moved toward the measuring instrument 16 (step 107). At this time, the tool 9 is, for example, 10
It moves at a relatively high speed of 00 mm / min. Tool 9
When the tip of the contacting device contacts the measuring device 16, a detection signal is transmitted from the measuring device 16 (step 108). Then, the operating direction of the motor 7 changes, the head 6 is raised, and the tool 9
Is separated from the measuring device 16 (step 109). At this time, the tool 9 is separated by, for example, about 3 mm until the detection signal of the measuring device 16 disappears with certainty.

The operating direction of the motor 7 is switched, the operating speed is reduced, and the tool 9 is moved toward the measuring instrument 16 (step 110). At this time, the tool 9 moves at a relatively slow speed of 20 mm / min, for example. When the tip of the tool 9 contacts the measuring device 16, a detection signal is transmitted from the measuring device (step 111). The coordinate value of the head 6 in the Z-axis direction at this time is read (step 112).
A preset correction value is added to this coordinate value to calculate the length of the tool 9 (step 113).

The tool 9 and the measuring instrument 16 are separated from each other, and the outer circumference of the cutting edge of the tool 9 is moved to a position facing the side surface of the measuring instrument 16 (step 114). The main shaft 8 is rotated at a speed of about 1000 rpm in the direction opposite to that at the time of processing (step 115). The relative movement between the tool 9 and the measuring device 16 is set (step 116). This relative movement amount is, for example,
0.3 mm, 0.05 mm, 0.01 mm, 0.005
mm, 0.001 mm, etc., and can be set in a plurality of stages. In this state, the motor 3 is operated to move the table 2 in the direction in which the measuring instrument 16 approaches the tool 9 (step 117). This movement is an intermittent movement having a stop time longer than the time for which the tool 9 makes one rotation at least once.

When the measuring instrument 16 contacts the tool 9, a detection signal is transmitted from the measuring instrument 16 (step 118). Then, it is confirmed whether the moving pitch of the measuring device 16 is the final pitch (step 119). At this time, when the moving pitch of the measuring device 16 is not the final pitch, the operating direction of the motor 3 changes, and the measuring device 16 is moved from the tool 9 to
The amount of movement is separated by one pitch. And step 1
Returning to step 16, the next movement pitch is set, and step 11
Repeat steps 7 and 118. When the moving pitch of the measuring device 16 is the final pitch, the coordinate value of the table 2 in the X-axis direction when the tool 9 and the measuring device 16 contact each other is read (step 120). It is confirmed whether or not the outer circumference of the tool 9 has been measured on both sides of the measuring device 16 (step 121). When the measurement is performed on only one side, the process returns to step 114, steps 114 to 121 are repeated, and the measurement on the other side is performed. When the measurement of both sides is completed, the diameter of the tool 9 is calculated based on the measurement result (step 122).

In this way, the length and the diameter of the tool 9 thus obtained are recorded in a predetermined memory of the controller 12, respectively.

By repeating the above operation,
All tools 9 that need to be measured are measured. In addition, tool 9
The length may be measured and then the result may be registered in the control device 12 immediately.

[0020]

As described above, according to the present invention, the tool and the measuring instrument are moved relatively at a relatively high speed, and after the contact between the tool and the measuring instrument is detected, the contact between the tool and the measuring instrument is temporarily made. Is opened, the tool and the measuring instrument are moved relative to each other at a speed slower than the relative movement speed, and the operation of detecting the contact between the tool and the measuring instrument is repeated a plurality of times to measure the dimension of the tool. The dimension of can be measured with high accuracy and efficiency. In addition, when measuring the outer diameter of the tool, the tool is rotated in the opposite direction to the one used during machining so that it contacts the measuring instrument.Therefore, it is possible to measure with the tool eccentricity and the spindle eccentricity included. It is possible to improve processing accuracy.

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure of the present invention.

FIG. 2 is a front view of a machining center showing an example of a machine tool to which the present invention is applied.

FIG. 3 is a side view of FIG.

[Explanation of symbols]

 2 ... table, 8 ... spindle, 9 ... tool, 16 ... measuring instrument

Claims (2)

[Claims] 1. A tool mounted on a spindle of a machine tool and a measuring instrument fixed to a table are moved relative to each other, and when the tool and the measuring instrument come into contact with each other, the amount of movement of the spindle or the table from the machine origin is determined by the tool. In the tool measuring method of measuring as the dimension of, the tool and the measuring instrument are relatively moved at a relatively high speed, and after the contact between the tool and the measuring instrument is detected, the contact between the tool and the measuring instrument is temporarily released, A tool measuring method characterized in that the measuring instrument is relatively moved at a speed slower than the relative moving speed, and the operation of detecting contact between the tool and the measuring instrument is repeated a plurality of times to measure the dimension of the tool. 2. The tool measuring method according to claim 1, wherein, when measuring the outer diameter of the tool, the tool is rotated in a direction opposite to that in machining and brought into contact with the measuring instrument.