JPH01263511A - Method for measuring rotary-type tool - Google Patents

Abstract

PURPOSE:To enable the execution of accurate measurement without being affected by a contact pressure, elastic deformation, etc., by a method wherein one end of a measuring area of a line sensor comprising a light-projecting element and a light-sensing element is positioned inside the fore end part of a tool. CONSTITUTION:One end 44b of a measuring area of a line sensor 41, which comprises a light-projecting element 42 and a light-sensing element 43 disposed oppositely in a taper type in the direction intersecting the axial line of an end mill tool 1 perpendicularly, is positioned inside the fore end part of the tool 1. The tool 1 being rotated at least once around the axis, a measured value of the end face of the tool 1 is taken in by the line sensor 41. Subsequently, the tool 1 is moved in a prescribed amount in the direction of the axis thereof, and with the tool 1 rotated at least once around the axis, a measured value of the end face of the tool 1 is taken in by the line sensor 41. The taper angle of the tool 1 is calculated on the basis of the measured values thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring a rotary tool, and more particularly, to a method for measuring the dimensions, shape accuracy, etc. of a tapered end mill tool or a radius end mill tool.

[Prior Art] As illustrated in FIG. 3 or FIG. 5, the tapered end mill tool 1 and the radius end mill tool 2 have a cutting edge lead extending to the tip of the tool, so the taper angle of the tapered end mill tool is It has become extremely difficult to measure the radius of the corner of a radius end mill tool.

At present, the methods for measuring the taper angle and corner radius mentioned above include: - Estimating the tool dimensions from measuring the cross section of the workpiece through test cutting - Indirect measurement using a magnifying projector - While rotating the tool A method of measuring using a three-dimensional measuring device is known.

[Problems to be solved by the invention] Among the above-mentioned methods, the test cutting method (■)
A workpiece is machined with a tool and the dimensions of the tool are estimated from the machined shape.The series of operations takes time, and the shape accuracy of the tool cannot be measured. The method using a magnifying projector (2) requires that the shadow of the tool be projected onto the magnifying projector while the tool is being rotated, and its outline must be plotted, and then the dimensions of the tool can be calculated using a gauge or numerical calculation, making it difficult to measure. Not only is it time-consuming, but it also requires experience and skill. In addition, the method (2) using a three-dimensional measuring device allows the shape of the tool to be measured fairly accurately, but the measurement takes a long time and requires considerable labor and skill.

[Means for Solving the Problems] The method for measuring a rotary tool according to the present invention is a method for measuring the taper angle, corner radius, and shape accuracy of the tip of the tool as follows.

First, one end of the measurement area of a line sensor consisting of a light emitting part and a light receiving part arranged opposite to each other in a direction perpendicular to the axis of the tool is positioned inside the tip of the tool. Next, while moving the tool a predetermined amount along its axis, the line sensor detects the position of the tool end face while rotating the tool at least once around the axis, or the line sensor is centered at one end of the measurement area. While rotating the tool by a predetermined angle around a horizontal axis in a direction perpendicular to the axis of the tool, the line sensor detects the position of the tool end face while rotating the tool at least once around the axis for each angle. Based on the measured values, the taper angle, corner radius, and shape accuracy of the tool tip are calculated.

[Example] A method for measuring a rotary tool according to an example of the present invention will be explained based on the drawings along with an example of the measuring device.

First, the measuring device will be explained.

As shown in FIG. 1, the measuring device 11 includes a tool rotation unit 12, a tool moving means 13, a measuring head 14, a measuring head driving means 15, a control/calculating section 16, etc. ing.

The tool rotation unit) 12 has a chuck (
(not shown), and the tool 1 can be accurately rotated around the axis by a predetermined angle by a motor 21. Therefore, this motor 21 is
For example, a pulse motor or the like is used so that the rotational position can be controlled.

Reference numeral 22 denotes a driving side rotating body, and the rotational force of this driving side rotating body 22 is transmitted to the driven side rotating body 24 by a transmission body 23.

Further, the tool moving means 13 reciprocates the tool rotation unit 12 in the axial direction of the tool 1. That is, this tool moving means 13 movably supports the above-mentioned tool rotation unit 12 by means of a guide rail 31, and a lead screw 3 attached to a pulse motor 32.
By rotating the tool 3, the tool rotation unit 12 can be moved along the guide rail 31 together with the tool 1 to a desired position.

The tool rotation unit 12 and the tool moving means 13 are provided with a position sensor (not shown) for electrically detecting the position of the tool 1 and feeding it back to the control/calculation section 16.

The measurement head 14 includes a line sensor 41. This line sensor 41 is configured to include a light projecting section 42 and a light receiving section 43 that are arranged to face each other in a direction orthogonal to the axis of the tool l. As shown in FIG. 3, the line sensor 41 detects the length a of the light shielding part 44a (hatched area in the figure) in the measurement area 44, thereby knowing the position of the end face of the measured location. It looks like this. The measurement head 14 is rotatably supported by a fixed frame 52 by a horizontal shaft 51 extending in a direction perpendicular to the axis of the tool 1. The center o'-o' (see FIG. 2) of this horizontal axis 51 coincides with the position of one end 44b of the measurement area 44, and the height of the one end 44b of the measurement area 44 and the axis 0-0 of the tool l coincide with the position of one end 44b of the measurement area 44. The height of the frame 52 or the relative height of the tool rotation unit 12 is designed such that the heights correspond exactly to each other.

The measuring head driving means 15 is equipped with a motor 53 . This motor 53 rotates the measurement head 14 by a predetermined angle around a horizontal axis 51 in a direction orthogonal to the axis of the tool l, centering on one end 44b of the measurement area mentioned above, and controls the rotational position. For example, a pulse motor is used to enable this. The measuring head driving means 15 is provided with a sensor (not shown) for detecting the position of the measuring head 14 and feeding it back to the control/calculating section 16.

The control/arithmetic unit 16 utilizes a microcomputer, for example, and includes a keyboard unit 61 and a display unit 62 for inputting various data manually. This control/calculation section 16 is capable of controlling the movements of the motor 21 of the tool rotation unit 12, the motor 32 of the tool moving means 13, and the motor 63 of the measuring head driving means 15.
And while taking in the measured value from the line sensor 41,
These measured values can be processed using preprogrammed processing procedures.

First, a method for measuring the taper angle of the tapered end mill tool 1 using the measuring device 11 having the above configuration will be described.

A tool 1 to be measured is accurately held so as not to move by a chuck of a tool rotation unit 12. This is done manually. The motor 32 of the tool moving means 13 is driven to move the tool l forward together with the tool rotation unit 12, and as shown in FIG. Stop the tool l at a location several spaces inside from the top of the tip, and then turn on the line sensor 41.
The measurement head 14 is rotated so that the measurement area 44 is at a position perpendicular to the axis of the tool 1, that is, 90'. By activating the motor 21, the tool 1 is rotated once around its axis, and the line sensor 41 measures the light shielding portion during the rotation. This measurement is performed, for example, at a distance of 200 m during one rotation of the tool l, and the maximum value a1 is extracted and inputted to the control/calculation unit 16. Next, the tool 1 is advanced by a predetermined distance ff1L together with the tool rotation unit 12, and the same measurements as above are made while the tool 1 is rotated once around its axis.The maximum value a2 is extracted and the control is performed. Performance W, input in section 16.

Based on the above measurements, the tapered end mill tool l
The taper angle α is calculated using the following formula. FIG. 4 shows the flow of measurement of the tapered end mill tool 1 described above.

Next, a method of measuring the corner radius of the radius end mill tool 2 shown in FIG. 5 using the measuring device 11 will be explained.

A tool 2 to be measured is accurately held so as not to move by a chuck of a tool rotation unit 12. This is done manually. The motor 32 of the tool moving means 13 is driven to move the tool 2 forward together with the tool rotation unit 12, and as shown in FIG. 2, and the measuring head 14 is rotated so that the measuring area 44 of the line sensor 41 is at a position perpendicular to the axis of the tool 2, that is, 90°. By activating the motor 21, the tool 2 is rotated once around its axis, and the line sensor 41 measures the light-blocking portion during the rotation. This measurement is performed at, for example, 200 locations during one rotation of the tool 2, and the maximum value is extracted and the control/calculation unit 16
to use human power. This maximum value is the radius of the straight portion of the radius end mill tool 2, and the diameter d is obtained by doubling this value.

Next, the tool 2 is moved to stop one end 44b, which is the center of rotation of the measurement area 44 of the line sensor 41, at a position half the tool diameter (d/2) inside from the top of the tip of the tool 2. , the measurement head 14 is rotated so that the measurement area 44 of the line sensor 41 is θ=45° with respect to the axis of the tool. By activating the motor 21, the tool 2 is rotated once around its axis, and the line sensor 41 measures the light-blocking portion during the rotation. This measurement is performed at, for example, 200 locations during one rotation of the tool 2, and the maximum value is extracted and the control/calculation unit 1
6 to use human power. From this maximum value and the tool diameter d, the radius of curvature R' of the corner portion is determined by the following formula. This R' is the approximate corner radius, and if the approximate dimension is sufficient, the measurement ends here.

In order to obtain an accurate corner radius and shape accuracy, the corner curvature ranges θ1 and θ2 are determined using the following formula. Next, the line sensor 41 is stopped at the position θl, and the tool 2 is rotated once around its axis in the same way as when θ=45°.
While rotating, the line sensor 41 measures the light-shielding portion during the rotation, and the maximum value is manually input to the control/calculation section 16. Centering on one end 44b of the measurement area 44 of the line sensor 41, the line sensor 41 is rotated by arbitrary angles over the range from θl to 02, repeating measurements a plurality of times, and inputting the values to the control/calculation section 16.

The manually entered data is processed using polar coordinate values (ro to
rn, θ0 to θn) to Cartesian coordinate values (xo to xn, y
O=\n).

Then, by the least squares method of circles, (xO−xn.

Radius value R and center position (X, Y
) is calculated. Further, the variation in the radius of curvature at each point between θO and θn is determined using the following formula (%). By displaying the various calculation results obtained in this way on the display section 62 and printing them out as necessary, it is possible to grasp the accuracy and dimensional accuracy of the tip shape of the tool 1, and to check whether these satisfy the specified values. It can be easily determined whether there is a The measurement flow of the radius end mill tool 2 described above is shown in FIG.

Although white light is normally used as the light source of the line sensor 41, the measurement accuracy can be further improved by using laser light, and minute radii of curvature can be measured.

According to the above measurement method, it is a method that directly measures the radius of the tip of a tool such as a rotary tool, so errors are less likely to occur.
Can be measured accurately. Automatic measurement is possible by programming the measurement procedure and processing procedure in the control/calculation unit 16 in advance, and does not require the operator's skill or skill.
Can be measured in a short time.

In addition, the measured values of the tool can be registered directly into the machine tool control computer, and the data necessary for machining can be used online.

Furthermore, a device according to the above measurement method is built into a machine tool,
Measure the tool tip each time machining and send the measurement data to NC
By reflecting this in the program, etc., the amount of tool wear can be constantly compensated for, allowing for more accurate machining.

[Effects of the Invention] According to the present invention, the following effects can be achieved.

(a) Since it is a non-contact measurement, there is no influence of contact pressure, elastic deformation, etc., and accurate measurement is possible. Furthermore, since the method directly measures the radius, etc., errors are less likely to occur.

(b) Since it is a non-contact measurement, there are no wear parts, and the device itself is almost maintenance-free. (C) Measurements can be performed in a short time and with high precision, regardless of the skill level or skill of the operator. Ru.

(d) Fully automatic measurement using a computer is possible, and the operator only needs to attach and detach tools, so the work required for measurement is simple. In addition, it is possible to automatically determine whether the tool is good or bad, and also to clearly indicate the location of the defect.

(e) The measured values of each part of the tool can be registered as they are in the machine tool control computer, and the data necessary for machining can be used online.

[Brief explanation of the drawing]

The figures are for explaining a measuring method for a rotary tool according to an embodiment of the present invention; FIG. 1 is a perspective view showing the entire device; FIG. 2 is an enlarged perspective view of the main part of FIG. 1; Figure 3 is a side view showing the movement of a tapered end mill tool when measuring the taper angle using a line sensor, Figure 4 is a flowchart when measuring the taper angle of Figure 3, and Figure 5 is a side view showing the movement of a taper end mill tool using a line sensor. FIG. 6 is a side view showing the movement when measuring the radius of the corner portion. FIG. 6 is a flow chart diagram when measuring the radius of the corner portion shown in FIG. l... Tapered end mill tool, 2... Radius end mill tool, 11... Measuring device, 12... Tool rotation unit, 13... Tool moving means, 14...
Measuring head, 15... Measuring head driving means, 16...
・Control/calculation unit, 41... line sensor, 42...
Light projecting section, 43... Light receiving section, 44... Measurement area, 4
4b...One end of the measurement area, 51...Horizontal axis. Patent applicant Topre Corporation 753 Figure 5 Figure 6

Claims (3)

[Claims] (1) One end of the measurement area of the line sensor, which consists of a light emitting part and a light receiving part arranged facing each other in a direction perpendicular to the axis of the tool, is located inside the tip of the tool, and the tool is rotated at least once around the axis. While moving the tool, the measurement value of the tool end face is captured by the line sensor, and then the tool is moved by a predetermined amount in the axial direction, and the measurement value of the tool end face is captured by the line sensor while the tool is rotated at least once around the axis. A method for measuring a rotary tool, characterized by calculating a taper angle of a tapered end mill tool based on the obtained measurement values. (2) One end of the measurement area of the line sensor, which consists of a light emitting part and a light receiving part arranged facing each other in a direction perpendicular to the axis of the tool, is located inside the tip of the tool, and the tool is rotated at least once around the axis. The measurement value of the tool end face is captured by the line sensor while the tool is being moved, the diameter (d) of the tool is calculated, and one end of the measurement area of the line sensor is moved inward by the tool radius (d/2) from the tip of the tool. while rotating the line sensor by a predetermined angle around one end of the measurement area and around a horizontal axis in a direction perpendicular to the axis of the tool, with reference to 45 degrees to the axis of the tool. While rotating the tool at least once around the axis for each angle, the line sensor captures the measurement value of the tool end face for each angle, and calculates the corner radius of the radius end mill tool based on the measurement values thus obtained. A measuring method for a rotary tool characterized by the following. (3) A method for measuring a rotary tool according to claim 1 or 2, wherein a laser beam is used as a light source of the line sensor.