JPH0318711A - Instrument and method for tool inspection - Google Patents

Abstract

PURPOSE:To realize the tool inspection instrument which easily takes a measurement without any variance in accuracy before working by providing a work rotating means which rotates a rod type work, a work forward/backward moving means, a probe turning means, and a moving means, and confirming shape accuracy based upon the tip of the work. CONSTITUTION:The work rotating means 14 which rotates the rod type work 1, work forward/backward moving means 43, probe turning means 44, and moving means 30 are used to confirm the accuracy regarding a shape such as the sphericity of the arcuate part of the work 1 according to its tip. Further, a measuring probe 5 is fixed on an X axis and the shape of the outer peripheral part is measured from the X axis and the rotation of the work 1; and the X axis is fixed and the probe 5 is rotated to measure the arcuate part. Consequently, the shape of the joint part between the outer peripheral part which is important to a ball end mill and the tip arcuate part can accurately be measured. Further, the turning angle of the probe 5 is set optionally, so an optional part of the arc of the ball end mill can be measured in detail.

Description

Detailed Description of the Invention Industrial Field of Application The present invention relates to a tool inspection device for measuring the shape of a tool cutting edge of a bar-shaped workpiece, and particularly to a tool having a spiral cutting edge such as a ball end mill or a radius end mill. This relates to the measurement of

Conventional technology To check the accuracy of the shape of the tool edge, such as sphericity, of a conventional bar-shaped work l (for example, a ball end mill), (1) Inspect the accuracy of the workpiece cut by the bar-shaped work l (ball end mill). There is a method in which the accuracy of the cutting edge of the rod-shaped workpiece is inspected based on the inspection results, and (2) a method in which the rod-shaped workpiece l is projected using a projector and the cutting edge thereof is inspected.

Among these, for measurement using a projector, the shape of the cutting edge of a bar-shaped workpiece is enlarged and projected on a screen, and a design drawing of the shape of the cutting edge drawn in an enlarged manner is set on the screen and projected. The actual shape of the cutting edge of the bar-shaped workpiece was compared with the design drawing to determine its accuracy.

<Problems to be Solved by the Invention> However, the conventional methods have the following problems.

(1) In the method of indirectly inspecting the precision of a ball end mill from the machined shape of a workpiece cut by a bar-shaped workpiece (ball end mill), it is not possible to predict the precision of the cutting situation before processing. Therefore, a workpiece is required for accuracy inspection, which not only increases material cost but also requires time for inspection.

Furthermore, it is difficult to determine whether the error in the machined shape of the workpiece is due to the precision of the cutting edge of the rod-shaped workpiece or to other causes.

(2) In the method using a projector, the procedure is the same as a simple shadow picture, and it is 0. Ol~0.05
This caused a reading error of about mm.

In view of the above, it is an object of the present invention to provide a tool inspection device that allows easy measurement without variations in accuracy no matter who performs the measurement before machining.

Means for Solving the Problems> As shown in Fig. 1.2, the means for solving the problems according to the present invention consists of a work head 3 that horizontally holds and rotatably supports the rod 2 of the rod-shaped work l, and a work head 3 that rotatably supports the rod-shaped work l. A measurement probe 5 for measuring the shape of the cutting blade 4 is provided, a turning means 44 for turning the measurement probe 5 in the horizontal direction around the cutting blade 4 about a vertical turning axis 6, and a moving means 20 for moving the probe 5 in a horizontal plane so as to be freely forward and backward relative to the pivot shaft 6; a forward/backward movement means 43 for moving the work head 3 to be freely forward and backward in the X-axis direction toward the pivot shaft 6;
It is provided with a rotating means l4 for rotating the rod-shaped workpiece 1 supported by the workhead 3 around an X-axis perpendicular to the pivot shaft 6.

The problem solving means of claim 2 is a tool inspection method for measuring the shape of a ball end mill having an outer peripheral cutting edge portion and a tip cutting edge portion of the tip arc portion using the tool inspection device according to claim I, , in the preparatory stage, the measuring probe 5 is arranged so that its rotation angle position is on the X axis, and the rod-shaped workpiece 1 is
The measurement probe 5 is brought into contact with the tip of the
The measurement probe 5 is rotated so that the rotation angle position is perpendicular to the X-axis in the horizontal plane, and the outer cutting edge 4 of the rod-shaped work l is
Measure the true radius Rl of a, and position the rod-shaped work l by moving it forward and backward in the X-axis direction so that the center of the rotation axis is located at a position retreating from the tip of the rod-shaped work l by the radius Rl of the outer peripheral cutting edge 4a. It is something that

According to a third aspect of the present invention, in the tool inspection method for measuring the shape of a radius end mill having an outer circumferential cutting edge portion and a tip circular cutting edge portion, in the preparatory stage, the tool inspection method includes: - Move the rod-shaped workpiece 1 to xI in a horizontal plane so that the center of its nominal radius is located at the center of the rotation axis.
It is moved and positioned in the direction orthogonal to Ill and in the X-axis direction.

According to a fourth aspect of the present invention, in the tool inspection method for measuring the shape of a ball end mill having a chip in the cutting edge at the tip of the outer circumferential cutting edge portion and the distal end arc portion, in the preparatory stage, the rotation angle position of the measurement probe 5 is set on the X axis. The radius Rl of the outer peripheral cutting edge 4a of the rod-shaped work l is measured by placing the measurement probe 5 at right angles to the rod-shaped workpiece 1. Then, the measurement probe 5 is rotated at a position rotated by a predetermined angle from the tip of the rod-shaped workpiece 1. Measure by touching,
Based on this measurement result and the predetermined angle, the rod-shaped work l is moved back and forth in the X-axis direction so that the maximum value of the predetermined angle is on the true radius of the tip arc of the workpiece, and the center of the radius is the center of the rotation axis. This is what I did.

In claim 5, the shape of the tip of the rod-shaped workpiece is inspected, and the measurement probe 5 is rotated around the tip cutting edge portion 4b of the rod-shaped workpiece l at regular angles, and the rod-shaped workpiece l is inspected at each angle. is rotated once around the X-axis, the maximum value measured by the measurement probe 5 at that time is measured, and the shape of the tip cutting edge 4b is intermittently inspected at each angle based on this maximum value, and its torsion angle is determined. It measures shapes such as sphericity and sphericity.

<Operation> In the above problem-solving means, the work rotation means l4 for rotating the rod-shaped work 1, the work advance/retreat means 43, the probe rotation means 44, and the moving means 2o are used to rotate the rod-shaped work 1 by using the workpiece rotation means 44 and the moving means 2o to move the true shape of the circular arc portion la with the tip of the workpiece as a reference. Since the precision of shapes such as sphericity is checked, even ball end mills, radius end mills, and throw-away ball end mills can be measured three-dimensionally at low cost and with no variation in inspection accuracy between operators.

In addition, for the outer circumference, the probe is fixed to the X sleeve and the shape of the outer circumference can be measured from the rotation of the X axis and the workpiece.For the tip arc part, the X axis is fixed and the probe rotates, allowing measurement of the circular arc part. This makes it possible to accurately measure the shape of the connection between the outer periphery and the arcuate tip, which is important for ball end mills.

Furthermore, since the turning angle θ of the probe can be set arbitrarily, the details of any part of the arc of the ball end mill can be measured.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an overall schematic diagram showing an embodiment of the tool inspection device according to the present invention, FIG. 2 is an enlarged plan view showing the relationship between the bar-shaped workpiece and the measurement probe of the tool inspection device, and FIG. 3 is an enlarged plan view of the tool inspection device. The longitudinal sectional view and FIG. 4 are functional block diagrams of the tool inspection device.

[Overall Configuration] As shown in the figure, the tool inspection device of this embodiment has a bar-shaped workpiece 1.
a work head 3 that holds the base 2 horizontally and rotatably supports it, and a measuring section 7 that measures the shape of the cutting edge 4 of the rod-shaped work l by rotating a measuring probe 5 around a vertical rotation axis 6. , a precision surface plate 8 that stably supports the measurement section 7 and the work head 3, a control section 9 that controls the drive of the measurement section 7 and the work head 3 and processes the measurement data, and An output device l0 for outputting test results is provided.

[Structure of work head section] The rod-shaped work l can be, for example, a ball end mill with an arc-shaped bottom blade, a radius end mill with a round corner on the bottom blade, or a throw-away ball whose cutting edge is formed into a special shape as a throw-away tip. An object to be inspected such as an end mill, for example, a rod-shaped workpiece (ball end mill) l shown in FIG. A plurality of (two pieces) consisting of a tip cutting edge 4b converging at the center of the part 1a.
A cutting edge 4 is formed.

As shown in FIG. 1, the work head 3 includes a cylindrical holder 11 that horizontally holds the base 2 of the rod-shaped work l, a work head case 12 that rotatably supports the holder, and a work head case 12 that rotatably supports the holder. It is provided with a control rotation means (rotation drive device) 14 such as a stepping motor 13 that rotates the installed holder 11 around an axis (X axis) (direction C) perpendicular to the rotation axis 6.

The work head 3 has a Y-axis guide rail 15 at its bottom.
It is guided so as to be movable in the Y-axis direction (the axial direction perpendicular to the rotation axis 6 and perpendicular to the X-axis).

Then, the work head 3 is manually moved in the Y-axis direction (not shown), the position in the Y-axis direction is measured and adjusted using the linear scale 15j1, and the work head 3 is positioned using an appropriate positioning means (for example, a fixing screw). It is considered possible.

The Y-axis guide rail 15 is movably guided in the X-axis direction by an X-axis guide rail l6 fixed to the surface plate 8, and a Y-axis guide rail drive device l7 is provided on the X-axis guide rail 16. .

The Y-axis guide rail driving device 17 uses a stepping motor 18 installed at the end of the X-axis guide rail I6, and a driving force of this motor 18 to drive a cross roller, a ball screw, etc. located on the Y-axis guide rail 15 (Fig. (not shown).

[Structure of Measuring Unit] As shown in FIGS. 1 and 3, the measuring unit 7 includes a disc-shaped turning table l supported rotatably around a vertical turning axis 6 on a surface plate 8.
9, and a moving means 20 supported on the upper surface of the swivel base 19 for moving the measurement probe 5 in two axial directions orthogonal to the swivel axis 6 and allowing it to move up and down.

The measurement probe 5 is composed of a stylus 22 for contacting the rod-shaped workpiece 1 and a probe body 23 that slidably supports the stylus 22. It has a well-known structure that is provided with a conversion section that converts movement and electrical signals. Note that the tip ball of the stylus 22 has a small diameter of 0.5R or less. Also,
When not in contact, the tip of the stylus 22 is balanced in the front-rear direction by moving forward approximately 0.08 m+n by a spring built into the probe body 23, and when an object comes into contact with the tip, the tip position moves forward by approximately 0.08 m+n. It has a structure that allows it to move to a state retracted by 08 nm. Thereby, the measurement probe 5 can measure up to about 0.08 mm from the front to the back.

As shown in FIG. 3, the moving means 20 includes a centripetal guide pedestal 25 fixed to the outer circumference of the swivel table l9 with a pin 24, and a centripetal guide pedestal 25 that is movably guided toward the center of the swivel shaft 6. A supported support body 26 and a centripetality adjustment body 2 that guides the probe body 23 to adjust its movement in the W direction shown in FIG.
7, an elevating guide body 28 that supports the probe body 23 so as to be able to rise and fall with respect to the support body 26, and the support body 26.
It consists of a stepping motor 29 for moving the stepping motor 29 in the centripetal direction (A-axis direction), and a probe advance/retreat means 30 for controlling the stepping motor 29. This stepping motor 29 is arranged at the outer end of the concentric guide stand 25. Moreover, the centripetality adjustment body 27 and the elevation guide body 28 have a structure that can be adjusted manually.

The swivel base 19 is rotatably supported by the boss portion 3l of the surface plate 8, and the hollow swivel shaft 6 is fixed in the center hole 32 of the swivel base 19. The rotating shaft 6 and the rotating table 19 are connected to a stepping motor 33 installed on the boss 3l of the surface plate 8.
It is driven to be able to rotate in forward and reverse directions. Furthermore, the center fitting hole 6a of the pivot shaft 6 is connected to the test par 34 (
(See Figure 6).

As shown in FIG. 2, when the angular position of the swivel table 19 is O'', it is assumed that the A-axis, which is the direction of the stylus of the probe 5, is perpendicular to the X-axis. is 90 degrees, the stylus 22 and probe body 23
It is necessary to make adjustments at the measurement preparation stage so that the A-axis direction, which is the axial direction of the A-axis, is aligned in a straight line.

[Structure of Precision Surface Plate] The precision surface plate 8 is box-shaped with precision finishing, and its upper surface is kept horizontal.

A projector 36 is fixed to the precision surface plate 8 from behind the measuring section 7 to above. In addition, precision surface plate 8
A stereoscopic microscope 37 for observing the shape of the rod-shaped work l under magnification can be detachably attached thereto.

[Configuration of the control unit] The control unit 9 is composed of a CPU of a computer as shown in FIG.
4 2, a rotation means (rotation drive device) 14 for rotating the work around the X axis, a forward/backward movement means 43 for controlling the movement of the Y sleeve guide rail 15 and the work head 3 in the X axis direction, and a turning table through the stepping motor 33. The support body 26 and the centripetality adjustment body 2 are connected to each other through a rotation means (swing drive device) 44 that controls the rotation of the l9 on a horizontal plane, and a stepping motor 29.
7 and probe advancing/retracting means 30 for controlling movement of the probe body 23 in the concentric direction (A-axis direction).

The CPU 4 2 includes a rotating means 14 and a work advancing/retracting means 4.
3. A control means 46 that outputs control signals to the turning means 44 and the probe advance/retreat means 30, and data based on control information of the control means 46, signal information from the measurement probe 5, and rotation information of the stepping motor I3 of the work head 3. and an inspection data processing means 47 for processing the data and transmitting output information to the output device 10.

The output devices 10 include a CRT display device 38, a block 39, a diskette device 40, etc., and numeral 41 in the figure is a human power device 4l such as a keyboard.

[Operation Description] In the above structure, the inspection procedure of a ball end mill as an example using the tool inspection device of the present invention will be explained along the flow shown in FIG.

[Preparation process for aligning the A-axis of the probe and the X-axis of the workpiece through the center of the pivot axis] (1) Adjusting the centripetality of the probe As shown in FIG. A test par 34 is fitted into the center fitting hole 6a perpendicularly to the rotation stage 19, and the measurement probe 5 is manually moved in the A-axis direction and pressed against the test par 34. At this time, probe 5
Since the stylus 22 of the measurement probe 5 is not necessarily pointing toward the center of the rotation axis 6, the centripetality adjustment body 27 is manually operated to move the probe 5 in the W direction. 22 is moved along the shape of the test par 34. Then, the horizontal position of the measurement probe 5 is fixed at a position where the distance from the center of rotation of the stylus 22 (hereinafter referred to as a measurement value) shows the maximum value. Then, test par 34
is a cylinder with a radius (DI/2) that coincides with the center of the rotation axis 6, so when the stylus 22 shows the maximum value, the measurement probe 5 is rotated to a 90° position around the rotation axis 6. This also indicates that the A sleeve direction coincides with the center of the pivot axis 6.

(2) Setting the scale origin in the A-axis direction Set the maximum value of the measured value in (1) as the radius D1/2 of the test par 34, store the value at this time in the memory of the control unit 9, and use it for later measurements. Make use of it.

In this case, the center of the rotation axis is determined to be the origin.

Note that DI is an actual value measured in advance.

After that, the test par 34 is removed.

(3) Adjustment of the vertical position of the probe and the Y-axis direction of the workpiece As shown in FIG. 7, the rotation angle position of the measurement probe 5 is set to O°. Then, the test parr 51 is fitted horizontally into the holder 11 of the work head 3, and the tip of the test parr 51 passes over the pivot shaft 6, and the stylus 2 of the measurement probe 5
The work head 3 is manually advanced in the X-axis direction until the test head 2 can come into contact with the base 51a of the test par 51. next,
The measuring probe 5 is pressed against the tester 51, the lifting guide 28 is manually operated, and the stylus 2 of the measuring probe 5 is
2 in the vertical direction along the shape of the tester 51, memorize the point where the measured value shows the maximum value dl, and further fix the vertical position of the measurement probe 5. Thereby, the A-axis of the probe 5 is located in the same horizontal plane as the X-axis of the workpiece. Next, the measuring probe 5 is rotated to 180 degrees, and the maximum value d2 of the measured values is stored in the same manner. From these two measured values, the diameter D2 of the test par 51 (=dl+d2
) is calculated, and the work head 3 is moved and fixed in the Y-axis direction to a position where the measured value becomes D2/2. As a result, the X-axis of the workpiece passes through the center of the rotation axis 6.

If the probe 5 is rotated by 90 degrees, the A-axis and the X-axis will be located on the same straight line and pass through the center of the rotation axis 6.

[Working process for aligning the arcuate end of the workpiece with the center of the rotation axis 6 using the workpiece end as a reference] (4) Specifying each value of basic data First, when moving the bar-shaped workpiece 1 forward, set a temporary reference position. The standard nominal value radius Ro of the rod-shaped work l for keeping the rod-shaped work l, the number M of teeth of the rod-shaped work l to determine the minimum rotation angle in the preparation stage of the rod-shaped work l, the rotation step angle Δθ at the time of measurement (the number of rotation steps is n) Then Δθ=90°/n)
, and the measurement range K and measurement step m of the joint shape between the outer cutting edge 4a and the tip cutting edge 4b of the cutting edge 4 of the rod-shaped work l, etc., are input to the input device 4l.
is inputted to the control unit 9 by.

(5) Measuring the radius Rl of the outer peripheral cutting edge of the workpiece As shown in Fig. 8, adjust the angular position of the swivel table l9 to 90'', imagine the allowance dimension a (0 to 3 mm) on the A axis, and measure. The measurement probe 5 is set at a position where the value becomes RO+a.

Then, the rod-shaped workpiece 1 of the work head 3 is moved forward while rotating gently on the X-axis until it contacts the stylus 22 of the measurement probe 5.
When it comes into contact with , it rotates one more time, reads the maximum value, and then controls to stop the forward movement on the X axis. Thereafter, the rod-shaped work l is rotated at least 11 revolutions at that position and then stopped. This means that the stylus 22 is attached to the cutting edge 4 of the work l.
This is to prevent the tip reference position from changing depending on whether the tip touches another part or not. As a result, the tip of the rod-shaped workpiece 1 is set at the RO1a position.

Next, the measurement probe 5 is controlled slightly backward on the A axis, and the angular position of the swivel table 19 is rotated in the B direction to set it to O°. After that, in order to detect the accurate radius rtl of the outer peripheral cutting edge 4a of the rod-shaped workpiece 5, the rod-shaped workpiece 5 is further advanced by a distance b, and the measurement probe 5 is placed on the A-axis to detect the rod-shaped workpiece i.
move forward until it touches. At the same time, the bar-shaped work l is gently rotated by one rotation (360°) so that the measurement probe 5 detects the first blade of the cutting edge portion 4 of the bar-shaped work l.
direction (clockwise rotation), and the maximum value of the measured value during that period is set as the workpiece radius Rl.

(6) Positioning of the workpiece in the X-axis direction Since the radius Rl has been detected in (5) above, the bar-shaped workpiece l is retreated by ΔL. In addition, ΔL-(R O
+a+b) - R 1.

As a result, the center of the arc portion la coincides with the center of the rotation axis 6 with the tip of the work l as a reference, and the work! The position in the X-axis direction is determined.

[Inspection process of cutting edge shape] (7) Measurement of the joint shape between the outer circumferential cutting edge and the tip cutting edge The rod-shaped workpiece l, which is stationary after being rotated in the C direction in (6) above, is
For example, the state is as shown in FIG. 9, and the rotation angle of the cutting edge of the rod-shaped workpiece 1 at this time is set as the origin (0°), and the angle in the C direction is initialized. At this time, the angular position of the turning base l9 is adjusted to 0° (the angular difference between the A-axis of the measurement probe 5 and the cutting edge is a position rotated by ξ from the origin).

Then, as shown in FIG. 10(a), the rod-shaped work l advances by K from the position determined by the operation (6) above (ql). In this state, the stylus 22 is brought into contact with the rod-shaped workpiece 1, the rod-shaped workpiece 1 is gently rotated by 360°/M in the C direction (clockwise rotation), the maximum value of the measured value during that period is measured, and this is By performing this process for only a few minutes, the position of the outer circumferential cutting edge portion 4a at a certain position on the X axis of the workpiece can be detected. If this detection operation is performed every time the tool moves backward by K/m (q2 to qm), the shape of the joint between the outer cutting edge 4a and the tip cutting edge 4b can be measured.

In addition, when measuring the shape of the outer peripheral cutting edge portion 4a, the plot interval in the X-axis direction of the workpiece 1 may be measured as the base rather than the connecting portion.

(8) Measurement of the cutting edge shape of the tip arc portion 1a of the workpiece (
After repositioning the workpiece 1 according to step 6), rotate the rod-like workpiece 1 by 360° in the C direction while bringing the stylus 22 into contact with the shape of the cutting edge of the rod-like workpiece 1 at the O° position of the measurement probe 5. The maximum value of the measured values is stored as R1 at the turning angle position of 0°.

Next, move the swivel base 19 to Δθ (=90°/
n) and operate in the same manner as above, and the maximum value of the measured value at a certain angle θ is stored as Rl.

Then, as shown in FIG. 10(b), Rt is stored by repeating the above operation until the angular position of the swivel base 19 is from P1 to Pn (=90'').

This makes it possible to intermittently inspect the rotational shape of the tip cutting edge portion 4b of the rod-shaped work l.

Note that if the maximum value of the probe is not detected even if the workpiece rotates 360 degrees during the process, the automatic measurement is stopped and it is determined that there is no cutting edge.

[Operation of the output device (9) When the angular position of the swivel base l9 reaches 90°,
The test results are output to the output device IO as shown in FIGS. 11(a) to ('). Note that FIGS. 11(a) to 11(f) are diagrams showing printed out measurement results of a rod-shaped work l (ball end mill) having two cutting blades. Among them, Fig. II (a) is a printout of the measurement data of one of the two cutting edges of the tip cutting edge part 4b, and shows that the rotation angle (measurement angle) of the measurement probe 5 is o. ，
Δθ=3.9 1 from o o o° to 90 000°
The tool was rotated 3 degrees at a time, and the maximum measured value (tool radius) R1 and its deviation value at each angular position were recorded. The same figure (b) shows the result of measuring the other tip cutting edge similarly to the same figure (a). Same figure (C)
is a printout of the measurement results of the cutting edge of the outer circumferential portion 4a, and for each of the two cutting edges, the connecting portion between the tip arc portion 1a and the outer circumferential portion 4a is 0.5. Maximum measurement value (tool radius) Rl at 0.05 mm intervals between the retracted position and
and its deviation values are recorded. Note that the tool angle here indicates the rotation angle ξ of the work l that showed the maximum measured value. In addition, in the same figure (d), the true radius Rl (=4
．． Figure 943) is used as a reference line, and the measurement results are plotted. Figure (e) shows the work l in which each turning angle position θ and the maximum measured value are recorded for each of the two cutting edges of the tip cutting edge portion 1a. The figure (r) is a graph of the figure (c), showing the relationship (state of twist angle) with the rotation angle ξ.

In this way, while rotating the rod-shaped workpiece l, the workpiece rotation means l4, the workpiece advance/retreat means 43, and the probe rotation means 44 are rotated.
Since the moving means 20 is used to check the accuracy of the shape such as the sphericity of the circular arc portion 1a using the tip of the workpiece as a reference, the measurement can be performed three-dimensionally at low cost and without variations in inspection accuracy depending on the operator. can do.

[Measurement of radius end mills] The tool inspection device of the present invention can be used to inspect not only ball end mills as described above but also radius end mills and the like.

That is, the rod-shaped workpiece 1 has a shape as shown in FIG.
When attempting to inspect the accuracy of a part of the corner whose nominal value RO is The position of the work head 3 in the Y-axis direction is set so that the central axes 6 are in a twisted positional relationship with each other, and the distance Yl is Yl=DO/2-RO. However, DO is the nominal diameter of the rod-shaped workpiece 1. Since the A-axis is concentric with the center of the rotation axis 6, the shape can be inspected by storing the maximum value measured by the probe 5 for each rotation angle Δθ, similar to a ball end mill.

[Measurement of throw-away ball end mill] Furthermore, for example, when the throw-away ball end mill shown in FIG. 13 does not have a cutting edge at the center of the tip, the above (5)
Depending on the procedure, it is not possible to align the center of the arc 1a of the work 1 with the center of the rotation axis 6 with the tip of the work 1 as a reference. Therefore, as shown in FIG. 13, the probe 5 is rotated to an angle where it can come into contact with the circular arc portion 1a, and the rod-shaped workpiece l
and the measurement probe 5, and perform an operation to align the center of the circular arc 1a with the center of the rotation axis 6.

In other words, as shown in FIG.
0'), and if R3 in the figure is estimated to be R3=R1, the positioning of the workpiece in the X-axis direction in (6) above is determined by the quadratic equation (ΔL)'' - 2 based on the cosine law. (R O +a)(△l,)co
This is possible by calculating ΔL that satisfies s(ζ゜)+(RO+a)'-Rl'' = 0 using the control means and moving back by this ΔL (note that the smaller one of the multiple solutions of the quadratic equation △L).

Other functions and effects are the same as those for ball end mill inspection.

Note that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the test par 34 used in (1) and (3)
．． Instead of the centering gauge 51, a centering gauge 52 having a substantially doglegged tip as shown in FIG. 14(a) may be used. In this case, first, fit the centering gauge 52 into the holder ti so that A-A is vertical as shown in FIG. It is aligned in the W direction by the centripetality adjustment body 27 and fixed at the position where the measured value is maximum. Thereby, the centripetal degree of the probe 5 can be adjusted.

Next, rotate the centering gauge 52 by 90 degrees around the X axis,
As shown in FIG. 14(C), A-A is made horizontal, and the measurement probe 5 is moved vertically by the lifting guide 28 and fixed at the position where the measured value is maximum.

Furthermore, the centering gauge 52 is rotated to check whether there is any fluctuation in the measured value. Thereby, the vertical position of the probe 5 can be adjusted.

Further, in the above embodiment, the swivel table l9 is formed in the shape of a rotatable disc, but it may be of an arm type supported by the swivel shaft 6.

Furthermore, in this embodiment, the concentricity adjusting body 27 for adjusting the position of the measurement probe 5, the lifting guide body 28, or the Y-axis direction positioning means for adjusting the position of the workpiece were manually operated. May be automated.

Effects of the Invention> As is clear from the above description, according to the present invention, by using a workpiece rotation means for rotating a rod-shaped workpiece, a workpiece advancing/retreating means, a probe turning means, and a moving means, the circular arc of the workpiece is adjusted based on the tip of the workpiece. Since we check the accuracy of shapes such as sphericity of parts, even ball end mills, radius end mills, and throw-away ball end mills can be measured three-dimensionally at low cost and without variations in inspection accuracy depending on the operator. There are excellent effects that can be achieved.

[Brief explanation of drawings]

FIG. 1 is an overall structural diagram of a tool inspection device according to an embodiment of the present invention;
Figure 2 is an enlarged plan view of Ichiro of the tool inspection device, Figure 3 is a sectional view of Ichiro of the tool inspection device, Figure 4 is a functional block diagram, Figure 5 is an operation flowchart, Figures 6, 7, and 8
The figure is a partially enlarged plan view of the tool inspection device, Figure 9 is an enlarged cross-sectional view of Ichiro's rod-shaped workpiece, and Figure 10 (a). (b) is a partially enlarged plan view of the tool inspection device, and Figures 11 (a) to (f)
12 and 13 are enlarged plan views of the tool inspection device, FIG. 14(a) is a perspective view of the centering gauge, and FIG. 14(b) shows the output results. (c) is a partially enlarged plan view of the tool inspection device. i Two rod-shaped workpieces, la: arc portion, 3: work head, 4
: Cutting edge, 5: Measuring probe, 6: Swivel axis, ! 4: Work rotating means, 20: Moving means, 30: Probe advancing/retracting means, 43: Work advancing/retracting means, 44: Probe turning means. Applicant Chubo Iron Works Co., Ltd. Agent Tsunehisa Nakamura No. 7 Fig. 81- Fig. 6 Fig. 10 (a) K (b) Fig. 8 Fig. 9 (Tip) Tsunejiretsuki》 1: 18.09 'r 2: 17.501 4 Zp and Fig. 11 (f) (Yumoto Shube) ヱ/ENG Q+flffl l: 2 cho. 363 2: 29.340 《Tea angle》 I. o. ooo 2: 0.115 Figure 13 Figure 14 (a) (b) 6 (C) A Figure 12 Tawara 3 Relationship with the person making the amendment case

Claims (1)

[Claims] 1. A work head that horizontally holds and rotatably supports the base of a rod-shaped workpiece, and a measurement probe that measures the shape of the cutting edge of the rod-shaped workpiece are provided, and the measurement probe is connected to the cutting edge of the rod-shaped workpiece. a rotating means for rotating the work head in a horizontal direction around a vertical rotating axis; a moving means for moving the measurement probe in a horizontal plane so as to be able to move forward and backward with respect to the rotating axis; A tool inspection device comprising: an advancing/retracting means for freely moving forward and backward in an orthogonal X-axis direction; and a rotating means for rotating a bar-shaped workpiece supported by a work head around an X-axis orthogonal to the rotation axis. . 2. In a tool inspection method for measuring the shape of a ball end mill having an outer circumferential cutting edge and a distal end cutting edge of an arcuate tip using the tool inspection device according to claim 1, in a preparatory stage, a measuring probe is used. is placed so that its rotation angle position is on the X-axis, and the measurement probe is brought into contact with the tip of the rod-shaped workpiece to calculate the distance from the center of the rotation axis to the tip of the rod-shaped workpiece.Then, the rotation angle position of the measurement probe is calculated. The true radius of the outer cutting edge of the rod-shaped workpiece is measured by rotating it in a horizontal plane to be perpendicular to the X-axis, and based on these measurement results, the true radius of the outer cutting edge of the rod-shaped workpiece is A tool inspection method characterized by positioning a bar-shaped workpiece by moving it forward and backward in the X-axis direction so that the center of the rotation axis is positioned at a position retreated by a radius. 3. In a tool inspection method for measuring the shape of a radius end mill having an outer circumferential cutting edge and a tip circular cutting edge using the tool inspection device according to claim 1, in a preparatory stage thereof,
Based on the nominal radius of the tip circular cutting edge of the bar-shaped workpiece, the bar-shaped workpiece is moved in a horizontal plane in a direction perpendicular to the X-axis and in the X-axis direction so that the center of the nominal radius is located at the center of the rotation axis. A tool inspection method characterized by positioning. 4. In a tool inspection method for measuring the shape of a ball end mill having a chip in the cutting edge at the tip of the tip arc portion using the tool inspection device according to claim 1, in the preparatory stage, the rotation angle position of the measurement probe is measured. The true radius of the outer cutting edge of the rod-shaped workpiece is measured by placing the measurement probe in the direction perpendicular to the The distance from the center of the rotation axis to the measuring contact part is calculated, and from this result and the predetermined angle information, the radius is determined so that the maximum value of the predetermined angle is on the true radius of the tip arc of the workpiece. A tool inspection method characterized by positioning a bar-shaped workpiece by moving it forward and backward in the X-axis direction so that its center is located at the center of a rotation axis. 5. In the tool inspection method according to claims 2, 3, and 4, after the preparatory step, the measuring probe is rotated at fixed angles around the cutting edge of the bar-shaped workpiece, and the bar-shaped workpiece is rotated at each angle by X. Make one rotation around the axis, measure the maximum value measured by the measurement probe at that time, and use this maximum value to intermittently inspect the shape of the tip cutting edge at each angle to determine its helix angle and sphericity. A tool inspection method characterized by measuring the shape of, etc.