JPH0769126B2 - Cutting edge accuracy detection method for cutting tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting edge accuracy detecting method for detecting the accuracy of an arcuate cutting edge of a cutting tool (for example, a ball end mill).

[0002]

2. Description of the Related Art Conventionally, the accuracy inspection of the arcuate cutting edge of a cutting tool such as a ball end mill is carried out by (a) actually cutting with the cutting tool and measuring the accuracy of the object to be cut. When observing the arcuate cutting edge with a projector and measuring the accuracy, there are some things.

[0003]

In the above accuracy inspection, the inspection value according to (a) depends on the tooling accuracy, cutting conditions, machine rigidity and accuracy, and it is difficult to inspect the accuracy of a true cutting tool. is there. In addition, it involves the trouble of actually cutting.

Further, in (b), since it is checked while the focus of the cutting edge is adjusted by the projector, it is necessary to be skilled when the cutting edge is a twisted blade. And, there is a limit to the magnification of the projector, and if the diameter of the cutting tool such as a ball end mill becomes large, an extremely large and expensive projector will be required, and it will be necessary for mold factories and grinding sites that actually handle cutting tools. There are some drawbacks to being unsuitable.

In view of the above problems, it is an object of the present invention to provide a cutting edge accuracy detecting method which can be easily operated, is easy to carry, and can accurately inspect the arc portion of a cutting tool.

[0006]

As shown in FIG. 1, the means for solving the problem according to the present invention rotates around a first shaft 1a and abuts on an arcuate cutting edge 3 of a cutting tool 2 such as a ball end mill to obtain its arc accuracy. A precision detector 4 for detecting the rotation, a rotation means 5 for rotating the precision detector 4 around the first shaft 1a in the same plane, and a rotation for rotating the cutting tool 2 around the second shaft 1b. A cutting edge accuracy detection device having means 7 and moving means for moving the cutting tool 2 in a direction parallel to the second axis 1b, and the first axis 1a and the second axis 1b are orthogonal to each other at a reference point P. Through the reference point P, the first axis 1a and the second axis 1b
The axis orthogonal to is the third axis 1c, the cutting tool 2 is positioned on the second axis 1b, and the accuracy detector 4 is rotated so as to be positioned on the third axis 1c. The measurement is performed by bringing the measurement tool into contact with the outer diameter portion, and 1/2 of the measured value is set as the radius of the arc of the cutting tool 2, and the accuracy detector 4 is rotated by 90 degrees around the first axis 1a, and together with the cutting tool 2. The central axis is the second axis 1b
When the cutting tool 2 is brought into contact with the accuracy detector 4, the second shaft 1 is aligned until the measured value is the same as the radius value.
The reference point P becomes the center of the arc of the cutting tool 2, and the accuracy detector 4 is moved along the arcuate cutting edge 3 of the cutting tool 2.
Is rotated around the first axis 1a at a constant angle, the cutting tool 2 is rotated once around the second axis 1b at each angle, and the accuracy detector 4 performs measurement. The shape accuracy of the arcuate cutting edge 3 is inspected at each angle from the difference from the value.

[0007]

In the above means for solving the problems, the cutting tool 2 is moved on the second shaft 1b, and the accuracy detector 4 located on the third shaft 1c is brought into contact with the outer diameter portion of the cutting tool 2 at that time. The measurement value of the accuracy detector 4 is read. 1/2 of this measured value
Corresponds to the radius of the arc of the cutting tool 2.

Next, the detector 4 is rotated in the same plane around the first shaft 1a by the rotating means 5 including the rotating table 16 and the like.
The central axis of the detector 4 and the central axis of the cutting tool 2 are aligned on the second axis 1b, and the cutting tool 2 is moved until the reading of the detector 4 becomes the same as the above. Then, the center of the arcuate tip 3 of the cutting tool 2 coincides with the first axis 1a, and in this state, the detector 4 is brought into contact with the outer diameter portion of the cutting tool 2 and the tip 3 is rotated at a constant angle around the first axis. Then, the cutting tool 2 is rotated once around the second shaft 1b by rotating the cutting tool 2 from the tip to the side as required, and the shape of the arcuate cutting edge 3 of the cutting tool 2 is measured.

This measured value is, for example, 1/2 of the measured value of the outer diameter.
When compared with a reference value based on a sphere having a radius of, the difference between the two becomes the shape accuracy of the cutting edge 3, and the accuracy of the cutting edge 3 can be evaluated.

[0010]

FIG. 1 is a partially longitudinally enlarged side view of a cutting edge accuracy detecting device for a cutting tool showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view thereof, and FIG. FIG. 5 is a side view showing a state in which a reference gauge is fitted to the rotary shaft, and FIG. 5 is a perspective view showing a state in which the accuracy detector is also rotated around the rotary shaft to detect the accuracy of the tip of the arcuate blade edge, FIG. 6 is a perspective view showing a state in which the cutting tool is rotated around its axis to detect the accuracy of the twisted cutting edge, and FIG. 7 is a state in which the accuracy of the tip of the arcuate cutting edge is also detected. Plan view,
8 is a plan view showing a state in which the accuracy of the side portion of the arcuate cutting edge is detected, FIG. 9 is a plan view comparing the reference cutting tool with the measuring cutting tool, and FIG. 10 is the same. It is a precision comparison graph of the cutting tool used as a reference, and the measured cutting tool.

As shown in the drawing, the blade edge accuracy detecting device of this embodiment rotates around the first shaft 1a and hits the arcuate edge 3 of the cutting tool 2 (ball end mill as a work) to detect the arc accuracy. Accuracy detector 4 is provided, the first shaft 1a is arranged so as to be orthogonal to the second shaft 1b at a reference point P on the second shaft 1b which is the rotation center of the cutting tool 2, Rotating means 5 for rotating the shaft 4 around the first shaft 1a in the same plane is provided.

Further, the cutting edge accuracy detection device has a work spindle 7 as a rotating means for rotating the cutting tool 2 around the second shaft 1b, and a movement for moving the cutting tool 2 in a direction parallel to the second shaft 1b. And means, and FIGS.
In the above, the work head 6 has a part internally fitted and supported so that the work spindle 7 can rotate.

The cutting tool 2 is attached to the front part of the work spindle 7 via a holder 8.

The work head 6 is a first moving base 9 for moving the work head 6 in the axial direction perpendicular to the central axis (hereinafter, referred to as X axis) of the work spindle 7 as the second shaft 1b and the work head 6. Is attached to the receiving base 11 via the second moving base 10 that moves the X axis on the X axis. A disk-shaped handle 12 having a bolt for moving the work spindle 7 in the X-axis direction and a nut or the like screwed to the bolt is rotatably provided at the rear portion of the receiving base 11. Further, a disk-shaped handle 13 for moving the work head 6 in a direction perpendicular to the X-axis within a horizontal plane including the X-axis is rotatably provided on a side portion of the first moving table 9. The moving table, the handle, and the like constitute a moving means.

The detector 4 has an arbitrary reference point P on the X axis.
In the horizontal plane including the X axis, a third axis 1c (hereinafter, referred to as Y axis) orthogonal to the X axis and the first axis 1a (hereinafter, referred to as Z axis) perpendicular to the Y axis are defined, and the Z axis is defined. Is mounted in the horizontal direction formed by the X-Y axes.

As shown in FIG. 1, the detector 4 comprises a dial gauge 15 and a probe 14 attached to the rear portion of the dial gauge 15. Then, the rotating means 5 has a rising mounting piece 16a for mounting the detector 4.
And an L-shaped rotary base 16 having an L-shaped rotary base 16 and a rotary shaft 17 for supporting the rotary base 16 on the Z-axis. The rotary shaft 17 is assembled to the pedestal 11 via a bearing 18, 1
The rotating horizontal plane of 4 is configured to coincide with the horizontal plane passing through the axis of the cutting tool 2.

Further, as shown in FIG. 1, the rotary base 16 comprises the mounting piece 16a and a base portion 20 having a guide slot 19 integrally formed with the mounting piece 16a. 16
Is slidably supported by the rotary shaft 17 through the guide elongated hole 19, and a protrusion 21 for guiding the sliding of the rotary base 16 is formed on the lower surface of the base 20.

Below the rotary table 16, there is provided a rotary table receiving plate 23 which is externally fitted and fixed to the rotary shaft 17 via a key 22, and an upper surface of the receiving plate 23 is provided with the rotary table receiving plate 23. A groove guide 24 into which the protrusion 21 enters is formed.

A notch 25 is formed on the upper end side of the receiving plate 23.
Is formed, a lid 26 that closes the notch 25 is fixed to the side surface of the receiving plate 23, and a screw hole 27 is formed in the plate surface of the lid 26.
The rotary base 16 has a small hole 28 on a side surface thereof.
A knob support piece 29 protruding further downward is fixed, and a rotary table sliding operation rod 30 which penetrates the small hole 28 and is screwed into the screw hole 27 is provided.

Further, the pedestal 1 is provided below the pedestal 23.
The collar 31 having the same diameter as that of the receiving plate 23 fixed to No. 1 and fitted on the rotating shaft 17 is arranged.
Marks 32 are formed on the receiving plate 23 to indicate the scales of the scaled collar 31.

Reference numeral 33 in FIG. 4 is a reference gauge having a predetermined arc diameter dimension, reference numeral 34 in FIG. 1 is a spacer, and reference numeral 35 is a rotary shaft cover attached to the pedestal 11 by screws 36. In order to align the center axis (X axis) of the work spindle 7 as the second axis 1b and the tip point of the probe 14 with at least one of the detector 4 and the work head 6 in the height (Z axis) direction. Height adjusting means (not shown) is provided.

In the above structure, first, as a preparatory step,
The holder 8 is attached to the work spindle 7 of the work head 6, a separately prepared reference gauge is inserted into the holder 8, and the disc-shaped handle 13 and the height adjusting means are operated to set the tip point of the reference gauge and the probe 14. Relative positioning of the detector 4 and the work head 6 in the Y-axis and Z-axis directions is performed so as to be aligned with the tip point.

Next, the reference gauge is removed from the work spindle 7, and the cutting tool 2 is attached to the holder 8 instead of the reference gauge.

The handle 12 is used to move the second movable table 10 toward the reference point P so as to move forward on the X axis. At this time, probe 1
The axis of 4 is placed on the Y-axis passing through the reference point P. Further, the operating rod 30 is rotated and retracted so that the probe 14 does not hit the cutting tool 2.

Next, after advancing the arbitrary portion of the outer diameter portion of the cutting tool 2 on the X axis across the Y axis to some extent, the knob 30 is turned to advance the probe 14 toward the reference point P. , The cutting tool 2 is brought into contact, and the reading value of the dial gauge 15 at that time is read. In this case, since the cutting edge of the cutting tool 2 is often a twisting edge, the work spindle 7 is held by hand, and the probe 14 is rotated lightly so as to always hit the blade surface 3a of the arcuate edge 3 while the dial gauge is being rotated. Read the maximum value of 15.

Next, the rotary table 16 is rotated clockwise by 90 ° in the horizontal plane, and the central axis of the probe 14 and the central axis of the cutting tool 2 coincide, that is, both central axes coincide on the X axis. I will let you. At this time, the cutting tool 2 is rotated backwards by rotating the handle 12, the axis of the probe 14 is aligned with the X axis, and then the cutting tool 2 is moved forward until the reading becomes the same as the above-mentioned reading.

Now, the arc center P of the cutting tool (workpiece)
The tip of the probe 14 located at the reading of the dial gauge 15 coincides with 1 and the Z axis, and rotates about the Z axis at a value equal to the radius of the cutting tool 2.

Here, as shown in FIG. 5, while viewing the mark 32 and the collar 31 with the angle scale, the rotary base 16 is rotated from 0 ° to 90 °, and the rotary base 16 is stopped at every arbitrary position. As shown in FIG. 6, the work spindle 7 is rotated around the X axis at each time to bring the blade surface 3a of the cutting tool 2 into contact with the tip of the probe 14. The moving amount of the probe 14 at that time, that is, the reading value of the dial gauge 15 is read. Further, the detector 4 is rotated to measure the accuracy from the tip to the side of the arcuate cutting edge 3 in the same manner as shown in FIGS.

FIG. 10 shows a measurement example of the cutting tool 2 when the reading value of the dial gauge 15 of the reference gauge 33 having a predetermined size as shown in FIG. 4 is used as the reference value. Figure 10
Is a dial gauge 1 when the reference gauge 33 is used.
5 and the reading of the dial gauge 15 of the cutting tool 2 actually measured are shown. The graph shown by the solid line is based on the reference gauge 33, and the graph shown by the broken line is the actually measured cutting. It is the reading value of the tool 2. In this case, the value indicated by L in FIG. 9 is represented as the difference between the solid line and the broken line at each angle in FIG.

In this way, the arcuate cutting edge of the cutting tool 2,
In particular, it is possible to easily detect what shape accuracy the blade surface 3a has.

That is, in consideration of the fact that the ball end mill is a rotary tool, the arcuate cutting edge of the cutting tool is set under the condition that the object to be measured and the detector have to be arranged on a straight line in the measuring direction. Considering a sphere, 1/2 of the outer diameter is used as a reference radius value, and the cutting tool position is set so that the point corresponding to the reference radius value from the tip of the cutting edge on the center axis of the cutting tool becomes the center of the sphere. It is important to detect the accuracy of the cutting edge while adjusting the. Therefore, in recent years, the arcuate cutting edge 3 of the cutting tool 2 is required to have a twisted shape in terms of cutting performance, but the rotation of the detector 4 in a horizontal plane passing through the central axis of the cutting tool 2 and the cutting tool 2 If the accuracy is detected in combination with the rotation around the central axis, the cutting tool 2
The shape accuracy at all points can be detected three-dimensionally, regardless of the shape of the tip of the. Therefore, in the detection apparatus of the present embodiment, particularly when evaluating the cutting tool 2 having a ball end mill arcuate cutting edge having a spiral shape or another complicated geometrical shape, it is very simple and accurate. Can be inspected.

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

For example, as another application, the cutting tool 2
The corner radius of the so-called radius end mill, which has a corner radius on the bottom edge of, can be measured by using a standard gauge together. In this case, the cutting tool 2 may be moved by the handle 13 in the Y axis direction perpendicular to the X axis and the horizontal plane by a value obtained by subtracting the radius of the corner portion from the radius of the radius end mill.

Further, in the above embodiment, only the maximum value of the measured values at each angular position was measured, but in addition to this, the minimum value of the measured values was also measured, and from the error between the maximum value and the minimum value, Variations in shape accuracy may be detected.

[0035]

As is apparent from the above description, according to the present invention, for a cutting tool such as a ball end mill, an accuracy detector is provided around the arcuate cutting edge of the cutting tool around the first axis.
It is possible to detect the shape accuracy of the arcuate cutting edge from the difference between the measured value and the reference value by rotating within a range of 0 degree, rotating the cutting tool once around the second axis, and measuring with the accuracy detector. Therefore, it is very effective that the detection device having only one accuracy detector can easily perform the three-dimensional evaluation of the cutting edge accuracy.

[Brief description of drawings]

FIG. 1 is a partially longitudinally enlarged side view of a cutting edge accuracy detection device for a cutting tool according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a side view showing a state in which a reference gauge is similarly fitted to the rotary shaft.

FIG. 5 is a perspective view showing a state in which the accuracy detector is also rotated around the rotation axis to detect the accuracy of the tip portion of the arcuate blade edge.

FIG. 6 is a perspective view showing a state in which a cutting tool is also rotated around its axis to detect the accuracy of a twisting edge.

FIG. 7 is a plan view showing a state in which the accuracy of the tip of the arcuate blade is also detected.

FIG. 8 is a plan view showing a state in which the accuracy of the side portion of the arcuate cutting edge is also detected.

FIG. 9 is a plan view in which the reference cutting tool and the cutting tool to be measured are also compared.

FIG. 10 is a graph showing the accuracy comparison between the cutting tool which is the reference and the measured cutting tool.

[Explanation of symbols]

 1a 1st axis 1b 2nd axis 2 Cutting tool 3 Arcuate cutting edge 4 Detector 5 Rotating means 6 Work head 7 Work spindle 8 Work holder 8 Moving base 12 Handle 13 Handle 14 Probe 15 Dial gauge 16 Rotating base 19 Guide long hole 21 protrusion 22 key P reference point P1 center

Claims (1)

[Claims] 1. An accuracy detector that rotates about a first axis and abuts an arcuate blade edge of a cutting tool such as a ball end mill to detect the arc accuracy, and the accuracy detector is coplanar about the first axis. Rotating means for rotating the cutting tool, rotating means for rotating the cutting tool around a second axis, and second cutting means for rotating the cutting tool.
A moving means for moving in a direction parallel to the axis , using the cutting edge accuracy detection device in which the first axis and the second axis are orthogonal to each other at the reference point, the first axis and the second through the reference point. Orthogonal to the axis
Set the axis to be the third axis, and position the cutting tool on the second axis.
Rotate the accuracy detector so that it is located on the third axis.
Measurement, bring it into contact with the outer diameter of the cutting tool, and measure it.
Using 1/2 of the constant value as the radius of the arc of the cutting tool,
Rotate the output device 90 degrees around the first axis to center with the cutting tool.
Match the core axis on the second axis, and use the cutting tool as an accuracy detector.
Until the measured value is the same as the radius value
Move on the second axis, and the reference point is the arc center of the cutting tool.
Next, to rotate around the arcuate edge in each predetermined angle to the first axis around the cutting tool the accuracy detector, and the cutting tool for each angle is one revolution a second axis around precision detector Measured by
Was carried out, the cutting edge precision detection method of the cutting tool, characterized in that the inspection of the shape accuracy of the arc-shaped cutting edge Te each angle odor from the difference between the measured value and the reference value.