JP2676616B2 - Measuring method for rotary tools - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for measuring a rotary tool, and more specifically,
The present invention relates to a method for measuring the size and shape accuracy of a taper type end mill tool or a radius end mill tool.

[Prior Art] The taper type end mill tool 1 and the radius end mill tool 2 have a cutting edge lead extending to the tip of the tool as illustrated in FIG. 3 or FIG. 5, so the taper angle of the taper type end mill tool It has become extremely difficult to measure the radius of the corner of a radius end mill tool. Currently, as a means to measure the above-mentioned taper angle and corner radius, a method of estimating the tool size from the measurement of the cross section of the workpiece by test cutting Method of indirectly measuring with a magnifying projector Three-dimensional measurement while rotating the tool There are known methods for measuring with a measuring instrument.

[Problems to be Solved by the Invention] Of the above-mentioned means, the method by the test deletion of is a method of machining a workpiece with a tool and estimating the dimension of the tool from the machining shape. However, the shape accuracy of the tool cannot be measured. The method of using a magnifying projector of 1 requires the shadow of the tool to be projected on the magnifying projector while rotating the tool, the contour of the tool to be blotted, and the size of the tool to be calculated by a gauge or numerical calculation. Not only is it time consuming, it also requires experience and skills. Also, in the method using the three-dimensional measuring device,
Although it is possible to measure the shape of the tool fairly accurately, the measurement takes a long time and requires a lot of labor and skill.

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

First, one end of the measurement area of the line sensor, which is arranged so as to face each other in a direction orthogonal to the axis of the tool, is positioned inside the tip of the tool. Then, while moving the tool along the axis by a predetermined amount, the position of the tool end face is detected by the line sensor while rotating the tool at least once around the axis, or the line sensor is centered on one end of the measurement area. Position of the tool end face is detected by the line sensor while rotating the tool at least once about the axis for each angle while rotating the tool about the horizontal axis in the direction orthogonal to the tool axis, and thus obtaining The taper angle of the tool tip, the radius of the corner and the shape accuracy are calculated based on the measured values.

[Embodiment] A method for measuring a rotary tool according to an embodiment of the present invention will be described with reference to the drawings together with an example of a measuring apparatus thereof.

 First, the measuring device will be described.

As shown in FIG. 1, the measuring device 11 includes a tool rotating unit 12, a tool moving unit 13, a measuring head 14, a measuring head driving unit 15, a control / calculation unit 16 and the like. There is.

The tool rotating unit 12 is provided with a chuck (not shown) for holding the tool 1, and the motor 21 can accurately rotate the tool 1 around the axis by a predetermined angle. Therefore, as the motor 21, for example, a pulse motor or the like is used so that the rotational position can be controlled. Reference numeral 22 denotes a drive side rotating body, and the rotational force of the drive side rotating body 22 is transmitted to the driven side rotating body 24 by the transmission body 23.

The tool moving means 13 reciprocates the tool rotating unit 12 in the axial direction of the tool 1. That is, the tool moving means 13 movably supports the tool rotating unit 12 described above by the guide rail 31, and by rotating the lead screw 33 attached to the pulse motor 32, the tool moving unit 13 is moved along the guide rail 31. The tool rotation unit 12 can be moved together with the tool 1 to a desired position. These tool rotation units
The 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 unit 16.

The measuring head 14 includes a line sensor 41. The 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 1.
As shown in FIG. 3, the line sensor 41 detects the length a of the light-shielding portion 44a (hatched area in the drawing) in the measurement area 44 so as to know the position of the end surface of the measured portion. It is like this. This measuring head 14
Is rotatably supported by the fixed-side frame 52 by a horizontal shaft 51 in a direction orthogonal to the axis of the tool 1. This horizontal axis
The center O′-O ′ of 51 (see FIG. 2) is aligned with the position of one end 44 b of the measurement area 44, and the measurement area 44
The height of the frame 52 or the relative height of the tool rotating unit 12 is designed so that the height of one end 44b of the tool 1 and the height of the axis OO of the tool 1 coincide with each other.

The measuring head drive means 15 includes a motor 53. This motor 53 moves the measuring head 14 to one end of the measuring area described above.
Horizontal axis 5 in the direction orthogonal to the axis of the tool 1 centering on 44b
It rotates one turn by a predetermined angle, and for example, a pulse motor is adopted so that the rotation position can be controlled. 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 / arithmetic unit 16.

The control / calculation unit 16 uses, for example, a microcomputer, and includes a keyboard unit 61 and a display unit 62 for inputting various data. The control / calculation unit 16 includes a motor 21 of the tool rotating unit 12, a motor 32 of the tool moving means 13, and a measuring head driving means 15 described above.
The movement of the motor 53 can be controlled, the measured values from the line sensor 41 can be taken in, and the measured values can be calculated by a pre-programmed processing procedure.

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

The tool 1 to be measured is held accurately by the chuck of the tool rotation unit 12 so as not to move. This is done manually. The motor 32 of the tool moving means 13 is driven to move the tool 1 forward together with the tool rotating unit 12, and as shown in FIG. 3, one end 44b, which is the center of rotation of the measurement area 44 of the line sensor 41, is moved to the tool. The measurement head 14 is rotated so that the measurement area 44 of the line sensor 41 is at a position orthogonal to the axis of the tool 1, that is, 90 °, while being stopped at a position within a few mm from the top of the tip of the tool 1. Then, by operating the motor 21, while rotating the tool 1 around its axis,
During the rotation, the line sensor 41 measures the light-shielding portion. This measurement is performed, for example, while the tool 1 is rotated once.
It is carried out at 200 points, the maximum value a1 of them is extracted and input to the control / arithmetic unit 16. Next, the tool 1 is moved forward together with the tool rotating unit 12 by a predetermined amount L, and the same measurement as above is performed while rotating the tool 1 once around its axis.
Extract a2 and input it to the control / calculation unit 16. Based on the above measured values, the taper angle α of the tapered end mill tool 1 is Ask for. The flow of measurement of the above tapered end mill tool 1 is shown in FIG.

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 described.

The tool 2 to be measured is held accurately by the chuck of the tool rotation unit 12 so as not to move. This is done manually. The motor 32 of the tool moving means 13 is driven to advance the tool 2 together with the tool rotating unit 12, and as shown in FIG. 5, one end 44b, which is the center of rotation of the measurement area 44 of the line sensor 41, is moved to the tool. The measurement head 14 is rotated so that the measurement area 44 of the line sensor 41 is located at a position orthogonal to the axis of the tool 2, that is, 90 °, by stopping the tip of the tip 2 at a position approximately inside the tool radius or more. And the motor
By operating the tool 21, the tool 2 is rotated once around its axis, and the line sensor 41 measures the light-shielding portion during the rotation. This measurement is performed at, for example, 200 points while the tool 2 is rotated once, and the maximum value is extracted and input to the control / calculation unit 16. This maximum value is the radius of the straight part of the radius end mill tool 2,
The value is doubled to obtain the diameter d.

Next, move the tool 2 and measure the measurement area of the line sensor 41.
One end 44b, which is the center of rotation of 44, is stopped inward from the top of the tip of the tool 2 by a half of the tool diameter (d / 2), and the measurement area 44 of the line sensor 41 is θ =
The measuring head 14 is rotated so that it becomes 45 °. Then, by operating the motor 21, the tool 2 is rotated once around its axis, and the line sensor 41 measures the light-shielding portion during the rotation. This measurement is performed at, for example, 200 points while the tool 2 is rotated once, and the maximum value is extracted and input to the control / calculation unit 16. From this maximum value b and tool diameter d Ask for. This R'is an approximate corner radius, and if the approximate dimensions are acceptable, the measurement is terminated here.

In order to obtain an accurate corner radius and shape accuracy, the corner curvature ranges θ1 and θ2 are Ask for. Next, the line sensor 41 is stopped at the position of θ1, the tool 2 is rotated once around its axis in the same manner as when θ = 45 °, and the line sensor 41 measures the light-shielding portion during the rotation, The maximum value is input to the control / calculation unit 16. Around the one end 44b of the measurement area 44 of the line sensor 41, the measurement is repeated a plurality of times by rotating it by an arbitrary angle over a range from θ1 to θ2, and the value is input to the control / calculation unit 16.

The input data is converted into polar coordinate values (r0 to r0) according to the processing procedure programmed in the control / calculation unit 16 in advance.
n, θ0 to θn) is converted into rectangular coordinate values (x0 to xn, y0 to yn).

Next, the radius value R and the center position (X, Y) are calculated from the data (x0 to xn, y0 to yn) by the least square method of the circle. In addition, the variation of the radius of curvature at each point in θ0 to θN is
Next formula Ask for. By displaying the various calculation results thus obtained on the display unit 62 and printing them out as necessary, the accuracy of the tip shape and dimensional accuracy of the tool 1 can be grasped, and these satisfy the specified values. It can be easily determined whether or not there is. The flow of measurement of the above radius end mill tool 2 is shown in FIG.

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

According to the above measuring method, since the radius of the tool tip portion of the rotary tool or the like is directly measured, an error is unlikely to occur and accurate measurement can be performed. Automatic measurement is possible by programming the measurement procedure and the processing procedure in the control / calculation unit 16 in advance, and the measurement can be performed in a short time without requiring the skill and skill of the operator.

Further, the measured values of the measured tools can be registered in the machine tool control computer as they are, and the data necessary for machining can be used online.

In addition, the device according to the above measurement method is built into the machine tool, the tool tip is measured each time machining is performed, and the measured data is stored.
By reflecting in the NC program etc., the wear amount of the tool can be always compensated, and more accurate machining can be performed.

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

(A) Since the measurement is non-contact, there is no influence of contact pressure, elastic deformation, etc., and accurate measurement is possible. Further, since the radius and the like are directly measured, an error is unlikely to occur.

(B) Since it is a non-contact measurement, there are no wear points and the like, and the device itself is almost maintenance-free.

(C) The measurement can be performed with high accuracy in a short time without being influenced by the skill and skill of the operator.

(D) It is possible to perform fully automatic measurement by a computer, and the operator mainly has to attach and detach the tool, so the work required for the measurement is simple. The quality of the tool can be automatically determined, and the defective position can be clearly indicated.

(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 description of the drawings]

1 is a perspective view 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 apparatus, and FIG. 2 is an enlarged perspective view of an essential part of FIG. Fig. 3 is a cross-sectional view showing the movement of the taper type end mill tool when measuring the taper angle by the line sensor, Fig. 4 is a flow chart diagram when measuring the taper angle of Fig. 3, and Fig. 5 is the radius end mill tool by the line sensor. FIG. 6 is a side view showing the movement of the corner portion when measuring the radius, and FIG. 6 is a flow chart diagram when measuring the radius of the corner portion of FIG. 1 ... Tapered end mill tool, 2 ... Radius end mill tool, 11 ... Measuring device, 12 ... Tool rotating unit, 13 ... Tool moving means, 14 ... Measuring head, 15 ... Measuring head driving means, 16: control / calculation unit, 41: line sensor, 42: light emitting unit, 43: light receiving unit, 44: measurement area, 44b: one end of measurement area, 51: horizontal axis.

Claims (3)

(57) [Claims] 1. An end of a measurement area of a line sensor composed of a light projecting section and a light receiving section, which are arranged so as to face each other in a direction orthogonal to the axis of the tool, is located inside the tip of the tool, and the tool is at least around the axis. The measured value of the tool end surface is taken in by the line sensor while rotating once, and the measured value of the tool end surface is measured by the line sensor while the tool is moved by a predetermined amount in the axial direction thereof while rotating the tool at least once. A method for measuring a rotary type tool, comprising taking in and calculating a taper angle of a taper type end mill tool based on the measured values thus obtained. 2. One end of a measurement area of a line sensor, which is arranged so as to face each other in a direction orthogonal to the axis of the tool and is composed of a light emitting section and a light receiving section, is located inside the tip of the tool, and the tool is at least about the axis. The measurement value of the tool end face is taken in by the line sensor while rotating once, the diameter (d) of the tool is calculated, and then one end of the measurement area of the line sensor is set to the tool radius (d / 2) from the tip of the tool. Positioned inside the minute, the line sensor is rotated by a predetermined angle around the horizontal axis in the direction orthogonal to the axis of the tool with reference to 45 ° with respect to the axis of the tool, centering on one end of the measurement area. However, while the tool is rotated at least once around the axis for each angle, the measured value of the tool end surface is taken in by the above line sensor for each angle, and the radius end is obtained based on the measured value thus obtained. Method of measuring the rotary tool and calculates a corner radius of Le tool. 3. The laser light used as the light source of the line sensor according to claim 1 or claim 2.
Measuring method for a rotary tool according to the item.