JPH077083Y2 - Measuring instrument for radius of curvature of bottom blade in ball end mill - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a curvature radius measuring device for a spherical bottom blade in a ball end mill, and more particularly to measuring the radius of curvature of the spherical bottom blade with a ball end mill mounted on a machine tool. Measurable,
The present invention relates to a radius of curvature measuring instrument for a spherical bottom blade in a ball end mill.

[Conventional technology]

Ball end mills with a bottom blade formed in a hemispherical shape are mainly used for profile processing of dies such as forging dies and press dies, but when used, the bottom blade mainly contributes to cutting near the center. Therefore, the bottom blade is most likely to be worn at the center.

Therefore, in the ball end mill, the bottom blade is formed in a completely hemispherical shape, but as the use progresses, the bottom blade is worn away from the central portion, and the radius of curvature of the central portion of the bottom blade gradually increases.

When the radius of curvature of the bottom blade is larger than a predetermined value, the cutting performance deteriorates. Therefore, at the machining site, the ball end mill is often used for cutting while frequently measuring the radius of curvature of the bottom edge of the ball end mill.

[Problems to be solved by the device]

By the way, conventionally, the radius of curvature of the spherical bottom blade has been measured by removing the ball end mill to be measured from the machine tool.

Therefore, the work of removing and reattaching the ball end mill is required for each measurement, which causes a problem that the above measurement is troublesome.

The present invention is intended to solve such a problem, and makes it possible to measure the radius of curvature of the bottom blade while the ball end mill that measures the radius of curvature of the bottom blade is mounted on the machine tool. An object of the present invention is to provide a radius-of-curvature measuring device for a bottom blade in a ball end mill.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the radius of curvature measuring instrument for the bottom edge of the ball end mill of the present invention has a base on which a magnet plate that can be attracted to the table surface of a machine tool is attached, and A vertically mounted rear plate, an upper plate that is mounted on the upper end of the rear plate in parallel with the base and has a hole for inserting and supporting the master model, and the rear plate And a gauge mounting plate that can be adjusted in position with respect to the rocking plate, and a contact that can be slidably contacted with the object to be measured. It is characterized by being configured with a dial gauge having a child.

[Action]

In the radius of curvature measuring instrument for the bottom edge of the ball end mill of the present invention described above, the dial gauge whose preset position is adjusted by using the master model is arranged immediately below the ball end mill as the object to be measured, Since the gauge contact oscillates along the bottom edge of the ball end mill and the radius of curvature of the bottom edge is measured, the radius of curvature of the bottom edge without removing the ball end mill from the machine tool. Can be measured.

Also, due to the action of the magnet plate attached to the bottom surface of the base,
The dial gauge can be easily attached to and removed from the table of the machine tool.

〔Example〕

Referring to the drawings, a radius of curvature measuring device for a bottom edge of a ball end mill as an embodiment of the present invention will be described below. FIG. 1 is a front view thereof, and FIG. 2 is a sectional view taken along the line II-II of FIG. is there.

The measuring instrument 10 for the radius of curvature of the bottom edge in the ball end mill of this embodiment is attached to the base 1 and the lower surface thereof, and the measuring instrument 10
With a magnet plate 2 for mounting on a table surface of a machine tool, a back plate 3 is vertically attached to the base 1, and an upper plate is provided on the upper end of the back plate 3 in parallel with the base 1. 4 is attached.

A hole 6 is formed in the central portion of the upper plate 4 to allow the spherical portion 5b of the master model 5 to penetrate and to hold the flange portion 5a of the master model 5 at its peripheral portion. Further, an oscillating plate 7 is attached to the upper part of the back plate 3 at its upper end via a pivot 8.

A movable plate 9 is mounted on the front surface of the rocking plate 7 so as to be vertically movable by fitting a protrusion 9a into a vertical guide groove 7a formed in the rocking plate 7. Further, a gauge mounting plate 11 is mounted on the front surface of the moving plate 9 so as to be movable in the horizontal direction by fitting a ridge 11a into a horizontal guide groove 9b formed in the moving plate 9.

Reference numeral 7b in the figure denotes a bracket projectingly provided on the rocking plate 7 and screwed with the screw 12 for adjusting the vertical position of the moving plate 9, and reference numeral 9c denotes a bracket projecting on the moving plate 9. 1 shows a bracket which is installed and to which a screw 13 for adjusting the horizontal position of the gauge mounting plate 11 is screwed.

A dial gauge 14 is mounted on the front surface of the gauge mounting plate 11, and the dial gauge 14 is provided with a contactor 14a having an upper end surface formed in a relatively wide flat portion and capable of sliding contact with an object to be measured. Reference numeral 14b indicates a handle provided on the outer peripheral surface of the case of the Dynal gauge. The handle
14b may be provided on another member different from the outer peripheral surface of the case of the dial gauge 14, for example, on the gauge mount 11.

At the time of use, prepare a master model 5 having a spherical portion 5b formed with the same radius of curvature as the bottom blade of the ball end mill to be measured before use, and make this spherical portion 5b into the hole of the upper plate 4. 6 and set on the upper plate 4. At this time, the center of the spherical portion 5b is set to coincide with the pivot 8.

Next, while holding the rocking plate 7 in a vertical state, the contact 14a of the dial gauge 14 is brought into contact with the lowest point of the spherical portion 5b so that the pointer of the dial gauge may be set to zero and the screw 12 and the screw.
The relative position of the dial gauge 14 with respect to the spherical portion 5b is adjusted by 13.

When this adjustment is completed, the oscillating plate 7 is oscillated around the pivot 8 by the handle 14b. During this oscillating period, the contactor 14a slides on the lower hemispherical portion of the spherical portion 5b.
Since the dial gauge 14 is swung about the pivot 8 of the swing plate 7, and the center of the spherical portion 5b of the master model 5 is set concentric with the pivot 8, the dial gauge 14 is swung during the above swing. The pointer should always point to zero,
Check this out. If the pointer swings with the above swing, readjustment with screws 12 and 13 is necessary.

Next, the master model 5 is removed from the upper plate 4, and the measuring device 10 is mounted on the table surface of the machine tool on which the ball end mill that is the object to be measured is mounted. The measuring device 10
By the action of the magnet plate 2 attached to the lower surface of the base 1, it can be easily mounted on the table surface.

Then, the ball end mill is set so that the lowest point of the bottom blade thereof comes into contact with the contact 14a of the dial gauge 14 by operating the spindle on which the ball end mill is mounted.

When the above work is completed, the swing plate 7 is moved by the handle 14b.
Oscillates around, and the dial gauge 14
By reading the amount of deflection of the pointer, the radius of curvature when measuring the bottom edge of the ball end mill and the radius of curvature of the spherical 5b of the master model 5 described above, that is, the bottom before the ball end mill is used for cutting The difference from the radius of curvature of the blade can be measured.

Generally, when a ball end mill is used for cutting, its bottom edge wears and its radius of curvature increases, so the amount of increase in the radius of curvature of the bottom edge measured by the above operation is Will be a standard for replacement.

[Effect of device]

As described in detail above, according to the curvature measuring device for curvature of the bottom blade in the ball end mill of the present invention, the following effects and advantages can be obtained.

(1) Since the radius of curvature of the bottom edge of the ball end mill can be measured with the machine attached to the machine tool, the bottom edge of the ball end mill can be checked very easily.

(2) By the action of the magnet plate attached to the bottom surface of the base,
The measuring device can be easily attached to or removed from the table surface of the machine tool.

[Brief description of drawings]

FIGS. 1 and 2 show a radius of curvature measuring instrument for the bottom edge of a ball end mill as an embodiment of the present invention. FIG. 1 is a front view thereof, and FIG. 2 is a view taken along the line II-II of FIG. FIG. 1 ... base, 2 ... magnet plate, 3 ... rear plate, 4 ... upper plate, 5 ... master model, 6 ... hole, 7 ... swing plate,
8 ... Axis, 9 ... Moving plate, 11 ... Gauge mounting plate, 12,1
3 …… Adjusting screw, 14 …… Dial gauge, 14a …… Contact, 14b …… Handle.

Claims (1)

[Scope of utility model registration request] 1. A base having a magnet plate attached to a table surface of a machine tool attached to a lower surface thereof, a rear plate vertically attached to the base, and an upper end of the rear plate having the above-mentioned structure. An upper plate that is mounted parallel to the base and has a hole for inserting and supporting the master model, a swing plate that is swingably attached to the back plate, and the swing plate. A ball, characterized by comprising a gauge mounting plate mounted so that its position can be adjusted, and a dial gauge having a contactor mounted on the gauge mounting plate and slidable on an object to be measured. Measuring instrument for the radius of curvature of the bottom edge of the end mill.