JPH0543369Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a device for measuring the radius accuracy of a tool cutting edge, for example, measuring the radius accuracy, so-called outer diameter accuracy, of a spherical cutting edge of tools such as ball end mills and arrogant styli. The present invention relates to a measuring device for

[Prior art] Conventionally, for example, to measure the radius accuracy of a spherical cutting edge of a tool such as a ball end mill, (1) using a projector, the shape of the spherical cutting edge of the tool is projected and magnified by approximately 10 times; A method to measure the radius accuracy of a spherical cutting edge from the shape and dimensions of its shadow.

(2) A method of determining the radius accuracy of a spherical cutting edge by cutting soft metal with the tool to be measured and measuring the cut surface of the soft metal with a three-dimensional measuring device.

There is.

[Problem to be solved by the invention] Although the conventional measurement method (1) described above has the advantage of being able to easily perform measurements at the site where the tool is used,
Since it is about 0.2 to 0.3m/m, even if you want to accurately measure the radius accuracy of a spherical cutting edge, it is impossible to measure the radius accuracy of a spherical cutting edge.
An error of about ~0.03m/m will occur.

In addition, although the conventional measurement method (2) has the advantage of being able to perform highly accurate measurements, it takes a very long time to obtain measurement results because it measures the cut surface after cutting the soft metal. However, there remains the problem that accurate measurements cannot be made if the quality of the cut surface of the soft metal is poor.

The purpose of the present invention is to solve the problems in the prior art described above.

[Means for Solving the Problems] The present invention for solving the above-mentioned problems includes: a base; a tool holding means provided on the base and capable of holding a tool such as a ball end mill having a spherical cutting edge at the tip; a rotating member provided on the rotating member so as to be rotatable about a straight line that is orthogonal to the axis of the tool and passing through the center of the spherical cutting edge of the tool and positionable at predetermined angles; The dimensions of the cutting edge can be measured by scanning the spherical cutting edge of the tool with a scanning line emitted from the light projecting part towards the light receiving part and calculating the length of time that a shadow is created or the length of time that light is transmitted. It is equipped with an optical scanning type dimension measuring instrument and the following.

[Operation] According to the above means, the outer diameter dimension of the spherical cutting edge of the tool held on the base via the tool holding means is measured by the optical scanning dimension measuring device at each predetermined angular position of the rotating member. be measured.

[Example] An example of the present invention will be described below with reference to the drawings. In FIG. 1 showing a side view of a tool cutting edge radius accuracy measuring device and FIG. 2 showing a plan view thereof, an XY table 2 is arranged on a base 1 having a rectangular plate shape.

The XY table 2 has a fixed plate 3 fixed on the base 1, and a fixed plate 3 fixed on the fixed plate 3 in the front and back direction (horizontal direction in the drawing).
It consists of a forward/backward movable plate 4 provided so as to be slidable in the forward/backward direction, and a left/right movable plate 6 provided so as to be slidable in the left/right direction (vertical direction in FIG. 2) on the guide portion 5 of the forward/backward movable plate 4.

On the base 1, there is a
Right and left front stoppers 7 made of short angle members are fixed to the fixing plate 3, and a rear stopper 8 made of a long angle member is fixed to the rear of the fixing plate 3 (left side in the figure). The upwardly protruding portions of the front stopper 7 and the rear stopper 8 restrict the range of movement of the advancing/retreating plate 4 in the front-rear direction to a predetermined amount.

A first micrometer head 9 as a fine movement feeder is attached to the center of the upwardly projecting portion of the rear stopper 8 with a spindle 10 directed forward. Furthermore, left and right springs 12 are installed between the rear stopper 8 and the forward/backward movable plate 4, which always bias the forward/backward movable plate 4 rearward. Therefore, the position of the reciprocating plate 4 is adjusted by the first micrometer head 9 with the rear end surface of the reciprocating plate 4 in contact with the tip of the spindle 9 due to the elasticity of the spring 12.

A left stopper 13 and a right stopper 14 made of band-shaped material are fixed to the left and right end surfaces of the guide portion 5 of the forward-backward movable plate 4, respectively. The upwardly protruding portions of the left stopper 13 and the right stopper 14 restrict the movement range of the left-right moving plate 6 in the left-right direction to a predetermined amount.

A second micrometer head 15 as a fine movement feeder is attached to the center of the upwardly projecting portion of the left stopper 13 with a spindle 16 oriented rightward. In addition, the left stopper 13
Front and rear springs 17 are installed between the left and right movable plate 6 and the left and right movable plate 6 to always bias the left and right movable plate 6 to the left. Therefore, with the left end surface of the left-right moving plate 6 in contact with the tip of the spindle 16 due to the elasticity of the spring 17, the position of the left-right moving plate 4 is adjusted by the second micrometer head 15.

A tool 2 such as a ball end mill having a spherical cutting edge 21 is mounted on the left-right moving plate 6 of the XY table 2.
A tool holding means 23 is provided for holding the tool 0 horizontally.

The tool holding means 23 includes a chuck mechanism (not shown) within the holding frame 24. Since the chuck mechanism is well known, its structure will not be explained here, but a well-known collet (not shown) grips the shank portion of the tool 20 with the spherical cutting edge 21 of the tool 20 directed forward. and its axis L1
It can be held rotatably around the center.

In front of the XY table 2 of the base 1, a shaft hole 1a opening in the vertical direction is formed, and a rotation shaft 26 is rotatably supported in the shaft hole 1a via a bearing 27. Therefore, the rotation axis 26
is orthogonal to the axis L1 of the tool 20 and
The straight line passing through the center C of the spherical cutting edge 21 is the axis L.
Rotate as 2. In FIG. 1, reference numeral 28 indicates a bolt, and 28a indicates a washer.

A rotating member 29 in the shape of a rectangular plate is horizontally attached to the upper end of the rotating shaft 26 .

The rotation member 29 includes a spring plunger 3.
0 plunger case 31 is attached. The spring plunger 30 includes a plunger 32 that is urged downward by a spring built into a plunger case 31.

The lower end of the plunger 32 is temporarily engaged with the locking hole 33 on the upper surface of the base 1 with the elasticity of the built-in spring. This locking hole 33
are perforated at predetermined angular intervals, in this example every 10°, on the circumference centered on the axis L2 of the rotation shaft 26 on the upper surface of the base 1, that is, on the rotation locus of the plunger 32 of the spring plunger 30. It is set up. Therefore, by rotating the rotating member 29 with an external force greater than a predetermined value, the plunger 32 is pushed in against the elasticity of the built-in spring and is released from the locking hole 33, thereby moving into the adjacent locking hole. 33 with said elasticity.

On the rotating member 29, an optical scanning dimension measuring device 35, for example, a laser outer diameter measuring device is installed. Since the optical scanning dimension measuring device 35 is well known, a detailed explanation thereof will be omitted, but to briefly explain it, as shown in FIG. By scanning the spherical cutting edge 21 of the tool 20 with the line 38 and calculating the length of time during which a shadow is created or the length of time during which light is transmitted, the spherical cutting edge 21 of the tool 20 and the spherical cutting edge 21 of the tool 20 are determined as shown in FIG. The dimension A between the spherical cutting edge 21 and the cutting edge 39 is measured to determine the outer diameter dimension (that is, the cutting edge dimension) R of the spherical cutting edge 21.

When measuring the radius accuracy of the spherical cutting edge 21 of the tool 20 in the tool cutting edge radius accuracy measuring device described above, first, the tool 20 is held with a collet that matches the tool diameter, and the collet is held in the tool holding means. It is held by a chuck mechanism of 23.
As a result, the axis L1 of the tool 20 is positioned within the vertical accuracy compensation range S of the optical scanning dimension measuring device 35.

Next, the position of the XY table 2 is adjusted using both micrometer heads 9 and 15 to align the center C of the spherical cutting edge 21 of the tool 20 with the axis L2 of the rotating shaft 26 to prepare for measurement. That is, the optical scanning dimension measuring device 35 is rotated to the left and right positions of the spherical cutting edge 21 of the tool 20, that is, to positions a and b shown by the two-dot chain line in FIG. The center of rotation (that is, the axis L of the rotation shaft 26)
2), measure the displacement of the axis L1 of the tool 20 with respect to
2) Align the axis L1 of the tool 20 with respect to the axis L1. Thereby, the tool diameter of the tool 20 is measured.

Next, the optical scanning dimension measuring device 35 is rotated to a position in front of the spherical cutting edge 21 of the tool 20, that is, to a position c shown by a solid line in FIG. The first micrometer head 9 of the XY table 2 is operated so that the center C of the spherical cutting edge 21 of the tool 20 coincides with the center of rotation (L2) of the measuring device 35 so that the first micrometer head 9 of the XY table 2 becomes R.

This completes the preparation for measurement.

Next, the optical scanning dimension measuring device 35 is rotated leftward and rightward every 10 degrees. That is, by rotating the rotating member 29 and positioning it through engagement between the plunger 32 of the spring plunger 30 and the locking hole 33, the optical scanning dimension measuring instrument 3
5 is positioned every 10°. In addition, the above a, b,
At each position c, the optical scanning dimension measuring device 35
is positioned in the same manner as above.

Then, while rotating the tool 20 by hand around the axis L1 at each of the rotational positions described above,
The maximum outer diameter R of the tool 20 is measured with a measuring range of 180° (see FIG. 4). This is because there is a so-called second relief behind the cutting edge of the spherical cutting edge 21 of the tool 20.

Then, the radius accuracy of the spherical cutting edge 21 of the tool 20 is evaluated based on the measurement data for each rotational position. As a result, the spherical cutting edge 21 of the tool 20
It is possible to measure the radius accuracy of approximately 0.01 m/m.

Note that the present invention is not limited to the above-mentioned embodiments, and changes can be made within the scope of the invention.

For example, the case of the optical scanning dimension measuring device 35 can be directly mounted on the rotation shaft 26. In this case, the case itself also serves as a rotating member.

If the tool 20 is supported by the tool holding means 23 so that the center of rotation (L2) of the optical scanning dimension measuring instrument 35 and the center C of the spherical cutting edge 21 of the tool 20 are always located, the XY table is used. 2 can be excluded.

Further, a tool holding means 23 is fixedly installed on the base 1, a rotation shaft 26 is supported on the base 1 via the XY table 2, and an optical scanning method is used to measure the center C of the spherical cutting edge 21 of the tool 20. It is also conceivable to make the rotation centers (L2) of the measuring device 35 coincide with each other.

[Effects of the invention] According to the invention, the outer diameter dimension of the spherical cutting edge of the tool held on the base via the tool holding means is measured by an optical scanning dimension measuring device at each predetermined angular position of the rotating member. Since the measurement is carried out by the tool, it can be easily measured at the site where the tool is used.In addition, since the spherical cutting edge of the tool is directly measured using a high-precision optical scanning dimension measuring device, the radius accuracy of the spherical cutting edge can be easily measured. can be measured with high precision and measurement results can be obtained immediately on the spot.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of a tool cutting edge radius accuracy measurement device, and Fig. 2
3 is an explanatory side view of the optical scanning dimension measuring instrument, and FIG. 4 is an explanatory plan view thereof. DESCRIPTION OF SYMBOLS 1... Base, 20... Tool, 21... Spherical cutting edge, 23... Tool holding means, 29... Rotating member,
35... Optical scanning dimension measuring device, 36... Light projecting section,
37... Light receiving section.

Claims (1)

[Claims for Utility Model Registration] A base; a tool holding means provided on the base and capable of holding a tool such as a ball end mill having a spherical cutting edge at the tip; a rotary member rotatably provided to be rotatable about a straight line passing through the center of the spherical cutting edge and positionable at predetermined angles; an optical scanning dimension measuring device capable of measuring the dimensions of the spherical cutting edge of the tool by scanning the spherical cutting edge of the tool with a scanning line and calculating the length of time that a shadow is formed or the length of time that light is transmitted; This is a tool cutting edge radius accuracy measuring device.