JP5881230B2 - Cutting tool inspection device - Google Patents

Description

  The present invention relates to an inspection device for inspecting the state of a cutting edge of a rotary tool such as a drill.

When a cutting tool of a rotary tool such as a drill becomes poor by use, the cutting edge is sharpened by using a grinding device such as a grindstone or a grinder, and the tool is repeatedly used.
For example, in the case of a twist drill, the cutting edge portion has a three-dimensional structure having cutting edges (edges) and tip pockets symmetrically so as to form a predetermined tip angle.
In addition to a general drill with a 118 ° tip angle, there are many types such as a 90 ° chamfering drill and a 180 ° counterbore drill.
Grinding a drill requires a high degree of skill. Conventionally, after drill drilling, trial drilling was performed and the cutting edge was sharpened and adjusted again.
As described above, the work of setting and adjusting the tool in the machine for the trial hole machining requires not only a large number of man-hours but also a problem that requires skill in the check by the trial machining.
Patent Document 1 discloses a drill edge inspection device provided with a pair of abutting members erected so as to be openable and closable at equal angles with a point or line on the axis of a drill as an apex.
However, the inspection device disclosed in the publication has a large play allowance because the mechanism that supports the pair of contact members is composed of a pin and a long hole that slidably holds the pin, and the stability of the pair of contact members Therefore, there was a problem in practicality.

JP-A-5-305558

  It is an object of the present invention to provide an inspection device for a blade that has a high inspection accuracy of the cutting edge of the blade and can be easily inspected.

  The blade inspection apparatus according to the present invention includes a mounting table on which the blade is mounted and a pair of gauge plates with which the blade tip portion of the blade contacts, and the pair of gauge plates has a central angle between the pair of gauge plates at the central portion. Are connected by a connecting shaft so that the angle can be freely adjusted, and has a guide member for supporting the pair of gauge plates from the back side.

Since the center angle of the pair of gauge plates is connected by a connecting shaft so that the angle can be adjusted, for example, the center angle is set to 118 °, and the shaft center of the drill having a tip angle of 118 ° corresponds to the connecting shaft. Apply.
If the drill tip is aimed at 118 ° symmetrically, the left and right cutting edges (edges) directly contact the gauge surface of the gauge plate, but the right and left cutting edges are ground correctly. If it is not done, there will be a gap on either the left or right gauge plate.
Further, if the surface is not linearly ground, a partial gap is generated on the gauge plate surface.
Therefore, it can be easily determined whether or not the cutting edge is properly ground.
Here, there is no particular limitation on the shape of the mounting table of the cutting tool as long as the cutting tool can be mounted so that the axis center of the cutting tool coincides with the symmetrical center line of the pair of gauge plates. As the structure in which the center and the symmetry center of the pair of gauge plates coincide, it is preferable that the V-shaped block shape has a substantially V-shaped cross section.

When the center angle of the pair of gauge plates changes, the connecting shaft moves in the front-rear direction with respect to the cutting edge of the cutting tool.
Therefore, it is preferable that the guide portions that support the pair of gauge plates from the back side support the gauge plates in a slidable manner according to the change in the center angle of the pair of gauge plates.
In the structure in which the gauge plate slides along the guide member, the sliding surface of the guide member is in contact with the back surface of the gauge plate, which is suitable for maintaining a high flatness of the gauge surface of the gauge plate.
In addition, it is not preferable that the gap between the guide plate and the slide surface of the guide member due to the slide of the gauge plate results in an angle variation of the gauge surface.
Therefore, a concave groove portion is formed in the guide member so that the gauge plate can be accommodated, and the bottom surface of the groove portion supports the back surface of the gauge plate while the pair of gauge plates are supported by the guide member from the back surface side. It is preferable to have a pressing support member for pushing from the front side.

The means for changing the center angle of the pair of gauge plates in the present invention is not particularly limited as long as the connecting shaft of the pair of gauge plates moves in the front-rear direction.
In order to change the center angle while supporting the pair of gauge plates with the pair of guide members, for example, the pair of guide members has a rotation shaft on the extension of the axis of the pressing support member, and the rotation Examples of the structure include an angle adjuster that has a rotation pin on the connecting shaft side of the shaft, and closes and separates the distance between the pair of rotation pins.
In this case, if the angle adjuster has a slide guide part that guides the movement of the connecting shaft in the front-rear direction caused by an operation in which the distance between the pair of rotating pins approaches and separates, the connecting part of the pair of gauge plates Since it moves while being supported by the slide guide portion of the angle adjuster, the stability of the gauge plate is high.
In addition, the center angle may be easily understood so that the center angle can be displayed digitally.
Furthermore, a magnifying glass may be provided so that the contact state of the cutting edge can be easily understood.

  The blade inspection apparatus according to the present invention supports a pair of gauge plates with a guide member from the back side, so that the gauge surface of the gauge plate is stable, the center angle accuracy of the gauge plate and the flatness of the gauge surface are high, and the inspection accuracy is improved. Excellent.

The state which test | inspects the adequacy of grinding of the blade edge | tip of a blade tool using the inspection apparatus which concerns on this invention is shown. (A) is an example of a blade edge angle of 118 °, and (b) is an example of a blade edge angle of 90 °. The structural example of an inspection apparatus is shown, (a) is a top view, (b) is a side view, (c) shows sectional drawing. The change of the center angle of a pair of gauge plates is shown. (A) shows an example of 180 °, (b) shows an example of 118 °, and (c) shows an example of 90 °. The state which mounted the blade in the inspection apparatus is shown. (A) is a plan view, (b) is a side view, and (c) is a front view. The perspective view of an inspection device is shown. (A) is an example in which the center angle of the gauge plate is 180 °, and (b) is 118 °. The positional relationship of a gauge plate, a guide member, and an angle cooker is shown. (A) is an example of a center angle of 180 °, and (b) is an example of 118 °. The perspective view of the state which mounted the cutting tool in the inspection apparatus is shown.

A structural example of the blade inspection apparatus 10 according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the inspection apparatus 10 includes a mounting table 11 on which the blades 1 and 2 are mounted, and a base portion 12 to which a pair of gauge plates 14 and 15 are attached so that the center angle thereof can be adjusted.
The base portion 12 is provided with an angle adjuster 13 for adjusting the center angle about the connecting shaft 16 on the center side of the pair of gauge plates 14 and 15 so as to be movable in the front-rear direction.
The angle adjuster 13 is substantially T-shaped in plan view as shown in FIG.

The connecting structure of the angle adjuster 13 and the pair of gauge plates 14 and 15 is as follows.
A pair of left and right guide members 17 and 18 are pivotally attached to the base portion 12 by pivot shafts 17a and 18b, and the guide members 17 and 18 are located on the center side of the pivot shafts 17a and 18b. Rotating pins 17c and 18c are provided.
The pair of pivot pins 17c and 18c are accommodated in a pair of left and right widthwise slide portions 13c and 13d provided in the angle adjuster, and when the angle adjuster 13 moves to the blade side, the width direction long hole When the distance between the left and right pivot pins 17c, 18c increases along the slide portions 13c, 13d, that is, moves away from each other, and conversely when the angle adjuster 13 moves to the left in FIG. The left and right pivot pins 17c and 18c move in a direction approaching each other so as to change from the state a) to the state (b).
As shown in FIG. 6, the pair of guide members 17 and 18 have support surfaces 17a and 18a formed with recessed grooves deep enough to accommodate the gauge plates 14 and 15, and the gauge plates 14 are provided on the support surfaces 17a and 18a. , 15 are slidably supported.
Here, when the center angle of the pair of gauge plates 14 and 15 changes, the connecting shaft 16 moves in the front-rear direction accordingly.
At this time, a slide guide portion 13b in the front-rear direction is formed in the angle adjustment 13 so that the movement of the connecting shaft 16 is stabilized, and a lower end portion where the lower side of the connecting shaft 16 is bent into an L shape in the slide guide portion 13b. This is a structural example in which 16a is stored.
Since the center angle changes while the pair of gauge plates 14 and 15 slides along the support surfaces 17a and 18a of the guide members 17 and 18 in this way, in this embodiment, as shown in FIG. Further, pressing support members 11d and 11e are provided on the mounting table 11 side.
The pressing support members 11d and 11e are spring plungers urged in a protruding direction by a spring provided in the cylinder portion 11g, and are fixed to the mounting table 11 with a set bolt 11i to adjust the urging force of the rear portion. The pressing force can be adjusted by the tool 11h.
Further, the axis centers of the rotating shafts 17b and 18b are positioned on the extension line of the axis center line of the pressing support members 11d and 11e so that the rotational force does not act on the gauge plates 14 and 15.

In this embodiment, as shown in FIG. 5, the mounting table 11 is a V block having a V-shaped cross section.
Therefore, since the mounting surface of the cutting tool is V-shaped with the slopes 11b and 11c formed on both sides of the valley line 11a, the connecting shaft 16 of the gauge plates 14 and 15 is positioned on the extended line of the valley line 11a. Then, the center of the blade edge coincides with the connecting shaft 16 simply by placing the cutting tool on the mounting table.
Examples of such states are shown in FIGS.
Further, since the mounting table is a V block, even if the diameter of the cutting tool changes, the center of the left and right direction axis can be handled without change.

As shown in FIGS. 2 and 3, the angle adjuster 13 is provided on the base portion 12, and is attached with a fixing knob 13f having a male screw portion 13i that is screwed to the screw portion. The angle adjusting tool 13 extends between the base portion 12 and the knob portion 13f. Thus, the angle adjuster 13 is moved and fixed via the guide hole 13a.
Also, a spring 13g in the pulling direction is attached between the bolt-side tip of the fixing knob 13f and the L-shaped bent part below the angle adjuster 13, and the spring force can be adjusted by the bolt 13h.
As a result, the angle adjuster 13 is biased in the direction of moving toward the blade, and therefore a center angle adjuster bolt 13e is provided to counter this.
Further, in this embodiment, a substantially triangular hole 12a is formed in the base portion 12, and the angle adjuster 13 is easily assembled.
Furthermore, the handle 12d is provided on the back side of the base portion 12.
It can be carried around with the handle 12d or hung on a wall or the like.
Therefore, as shown in FIG. 3, by loosening the fixing knob 13f and turning the center angle adjusting bolt 13e, the angle can be freely adjusted from the center angle 180 ° of (a) to the center angle 90 ° shown in (c). Yes.
In order to make the angle easy to understand, it is preferable to attach angle scales 12b and 12c as shown in FIG. 1B. For example, as shown in FIG. 7, a support line 13j attached to the angle adjuster 13 side. It can be set to a predetermined center angle simply by combining with.

  When the inspection apparatus according to the present invention is used, for example, in FIGS. 1A and 4, the center angle 118 ° of the pair of gauge plates 14 and 15 is set, and a cutting tool (drill) 1 having a blade edge angle of 118 ° is placed. FIG. 1B shows a state where the center angle of the gauge plates 14 and 15 is set to 90 °, and the blade tip 1c is connected to the connecting shaft so as to show a state in which a cutting tool 2 having a blade edge angle of 90 ° is placed. It is possible to check whether or not the grinding is appropriate only by checking whether there is any gap between the cutting edge surfaces 1a and 1b of the cutting edge and the gauge surfaces of the gauge plates 14 and 15.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Cutting tool 10 Inspection apparatus 11 Mounting base 11d Press support member 11e Press support member 12 Base part 12b Angle scale 12c Angle scale 13 Angle adjustment tool 13a Guide hole 13b Slide guide part 13c Slide part 13d Slide part 14 Gauge plate 15 Gauge plate 16 Connecting shaft 17 Guide member 17b Rotating shaft 17c Rotating pin 18 Guide member 18b Rotating shaft 18c Rotating pin

Claims (3)

A mounting table for mounting the cutting tool;
A pair of gauge plates with which the cutting edge portion of the cutting tool abuts,
The pair of gauge plates has guide members that support the pair of gauge plates from the back side, while the center angle of the pair of gauge plates is connected by a connecting shaft so that the center angle of the pair of gauge plates is adjustable.
The guide member slidably supports the gauge plate according to a change in the center angle of the pair of gauge plates,
An inspection device for a cutting tool, comprising a pressing support member for pushing from the front side the state in which the pair of gauge plates are supported by a guide member from the back side. Each of the pair of guide members has a rotation shaft on an extension of the axis of the pressing support member, and has a rotation pin on the connecting shaft side with respect to the rotation shaft,
The pair of the inspection apparatus of the cutting tool according to claim 1, characterized in that it has an angle adjuster for closely spaced intervals of pivot pin. 3. The blade tool inspection apparatus according to claim 2 , wherein the angle adjustment tool has a slide guide portion that guides the movement of the connecting shaft in the front-rear direction caused by an operation in which the distance between the pair of rotation pins approaches and separates. .

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