JPH0639005B2 - Cutting tools - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cutting tool, and more specifically, a plurality of cutting tips are directly connected to an inner peripheral portion or an outer peripheral portion of a cutter body at equal intervals, The present invention relates to a cutting tool configured to be aligned in the axial direction of the cutter body.

Generally, when machining the outer peripheral portion of the pins, journals, etc. that make up the crankshaft, a circular cutting tool is rotated under the action of a rotary drive source and the crankshaft or tool is relatively displaced in a predetermined direction. Then, the work such as the pin and the journal is cut by the tool.

Conventionally, as such a cutting tool, a tool in which a plurality of blades are integrally formed with a cutter body,
A tool in which the blade portion is detachably attached to the cutter body is used. However, with the former integrated tool, if the number of workpieces to be cut is large, the cutting edge will be worn, and even if it is necessary to replace only the cutting edge, the entire tool must be replaced. There is. Also, if the type of work is different, it goes without saying that the tool itself must be replaced in response to the work,
For that purpose, many kinds of tools have to be prepared according to the kind of the work, and it is pointed out that it is not economical in practice.

On the other hand, there are tools in which the blade portion is configured separately from the cutter body, in which the cutting tip is directly attached to the cutter body, and in which the blade portion to which the cutting tip is fixed is disposed on the cutter body. . Therefore, when high-precision cutting is desired, a large number of chips or blades must be provided on the cutter body, and the cutter body and chips or blades must be formed accurately. In particular, when machining a crank pin or the like, it is necessary to machine the outer peripheral portion of the crank pin with good accuracy and to machine the crank pin extremely accurately with desired dimensional accuracy in the axial direction of the crank pin.

Therefore, in this type of cutter body, a mounting portion for fixing the tip or the blade portion is formed with high accuracy, and further, the tip or the blade portion itself, the width direction of the cutter body, that is, the axial direction. All dimensions must be secured with high precision.

After all, the cutter body, the tip, and the blade portion all have to be precisely manufactured at the time of manufacturing, which is extremely complicated and requires a lot of time for the manufacturing work, and the tool is considerably expensive. The following disadvantage occurs.

In this case, it is also possible to grind the cutting edge portion integrally with the tip or blade portion fixed to the cutter body to make the width dimension of the cutter body in the cutting edge portion uniform. It is extremely difficult in practice to evenly align the blade portions, and therefore, since skilled techniques are required, the disadvantage that mass production cannot be performed is exposed.

Therefore, it has been proposed to attach a plurality of chips to the cutter body in a detachable manner and to adjust the position of each chip in the axial direction of the cutter body, as disclosed in, for example, Japanese Patent Laid-Open No. 57-41110. The technical idea is disclosed.

In this prior art, a positioning wedge is used in which a flat wedge member having an inclined top surface is fixed to a substantially cylindrical plug member. Then, with the positioning wedge inserted in a receiving groove formed in the cutter body and having a shape corresponding to the shape of the positioning wedge, differential screws threaded in opposite directions are formed on both sides of the plug forming the positioning wedge. The cutting insert (cutting tip) is axially adjusted on the top surface of the wedge member by being screwed into the screw hole formed in the member and the screw hole formed in the cutter body. There is.

However, in the above-mentioned conventional technique, in order to adjust the position of the cutting insert in the axial direction, a substantially cylindrical plug member, a flat wedge member, and a receiving wedge corresponding to the shape of the positioning wedge composed of the plug member and the wedge member are provided. Grooves and differential screws threaded on opposite sides in opposite directions must be used.
For this reason, the number of parts is increased and the manufacturing process is complicated. Especially, when a large number of cutting inserts are mounted, the number of parts is considerably increased and the manufacturing cost is increased.

The present invention has been made to overcome the above-mentioned inconveniences, and makes it possible to easily and highly accurately adjust the positions of a plurality of cutting tips in the axial direction of a cutter body with a simple configuration and a small number of parts. It aims at providing the cutting tool which does.

In order to achieve the above-mentioned object, the present invention is intended to fix a plurality of mounting portions formed of groove portions of a predetermined shape formed on an inner peripheral portion of a cutter body, and a cutting tip disposed in the mounting portion. A wedge-shaped fixing member that is inserted into and fixed to the mounting portion, and chip position adjusting means capable of adjusting the position of the cutting tip in the axial direction of the cutter body. A guide groove that defines a portion and is defined by an arcuate inner wall surface; a screw hole that is provided in a surface portion that extends in the rotational direction of the cutter body in correspondence with the center of the guide groove; Has a taper that corresponds to the inclined surface of the insert
An adjusting screw that presses the inclined surface of the cutting tip with the tapered surface by screwing into the screw hole while fitting in the guide groove to adjust the position of the cutting tip in the axial direction. It is characterized by

In the cutting tool according to the present invention thus configured, the adjusting screw is fitted into the guide groove while the cutting tip is provided in the mounting portion and the wedge-shaped fixing member is loosened. It is screwed into a screw hole formed in the surface portion.
Therefore, the tapered surface of the adjusting screw presses the inclined surface of the cutting tip to adjust the position of the cutting tip in the axial direction of the cutter body. And if you tighten the wedge-shaped fixing member,
The position-adjusted cutting tip is fixed to the mounting portion.

Next, preferred embodiments of the cutting tool according to the present invention will be given and described in detail below with reference to the accompanying drawings.

1 to 3, reference numeral 10 indicates a cutter body constituting a cutting tool according to the present invention. A large-diameter opening 12 is formed in the central portion of the cutter body 10, and a thin-walled flange portion 14 is formed at the outer peripheral edge of the cutter body 10 with a step. Bolt insertion holes 16a to 16f are formed in the flange portion 14 at equal intervals. Then, a plurality of mounting portions 18a and 18b are alternately formed on the inner peripheral surface portion defining the opening 12 of the cutter body 10 at equal intervals.

The mounting portions 18a, 18b are substantially the first openings 20a, 20b for mounting the fixing member and the second openings for mounting the chip.
22a and 22b are included. In this case, the first openings 20a, 20
Reference numeral b denotes a columnar shape, and screw holes 26a and 26b are formed in the one surface portions 24a and 24b which are oriented in the rotation direction of the cutter body 10. In addition, the other surface portion 28 that defines the first openings 20a and 20b
The a and 28b are oriented toward the center of the cutter body 10 and are inclined outward by a predetermined angle. On the other hand, the second openings 22a, 22b
Extend in the axial direction of the cutter body 10, and each one end side thereof communicates with the guide grooves 30a, 30b bent in a semicircular cross section. Then, the cutter body 10 is provided with screw holes 32a and 32b corresponding to the centers of the guide grooves 30a and 30b. Further, the one surface portion that defines the second openings 22a and 22b.
34a and 34b are oriented toward the center of the cutter body 10,
Therefore, the distance between the surface portions 34a, 34b and the surface portions 28a, 28b is designed to be narrowed toward the outside of the cutter body 10 in the radial direction.

In this case, as shown in FIG. 2, the cutter body is
It is preferable to form curved relief grooves 35a and 35b for guiding cutting waste to the outside between the mounting portions 18a, 18a and between the mounting portions 18b, 18b on the inner peripheral surface portion of 10. .

Therefore, the fixing members 36a and 36b are respectively attached to the openings 20a and 20b.
Is locked. The fixing members 36a and 36b have a substantially columnar shape, and have flanks 37a and 37b formed on one surface thereof, and the bolt insertion holes 38 from the flanks 37a and 37b.
a and 38b are formed through. Further, one side surface 40a, 40b of the fixing member 36a, 36b is inclined with respect to the other side surface portion 42a, 42b, and in this case, the side surface portion 40a, 40b is the first opening portion 20.
It corresponds to the inclined surface portions 28a and 28b of a and 20b.

In such a configuration, the fixing members 36a and 36b are inserted into the first openings 20a and 20b so that the side surface portions 40a and 40b abut the respective surface portions 28a and 28b, and then the bolts 44a and 44b are inserted into the hole portions 38a. , 38b, and the tips are screw holes 26a, 26b.
Screw into. As a result, the fixing members 36a and 36b are engaged with the mounting portions 18a and 18b.

On the other hand, cutting tips 46a and 46b are mounted in the openings 22a and 22b. The tips 46a and 46b have cutting edge portions 48a and 48b.
50a and 50b are provided in directions orthogonal to each other,
The surface portions 52a, 52b corresponding to the cutting edge portions 48a, 48b are oriented outward in a direction away from the cutting edge portions 50a, 50b. Then, insert the chips 46a and 46b into the openings 22a and 22b.
Inserted into the chip and held by the surface portions 34a, 34b and the surface portions 42a, 42b of the fixing members 36a, 36b, and the adjusting screws 54a, 54b through the guide grooves 30a, 30b.
b is screwed into the screw holes 32a and 32b to adjust the positions of the chips 46a and 46b. In this case, the adjusting screws 54a and 54b are formed with taper portions 56a and 56b corresponding to the inclined surface portions 52a and 52b of the tips 46a and 46b.

The cutting tool according to the present invention is basically constructed as described above. Next, its operation and effect will be described.

Therefore, first, the positions of the cutting tips 46a and 46b are adjusted corresponding to the work, for example, the crank pin 58.
That is, the bolts 44a that are inserted into the fixing members 36a and 36b,
44b is slightly screwed into the screw holes 26a, 26b to fix the fixing member.
36a, 36b are temporarily fixed, the adjusting screw 54a is screwed into the screw hole 32a, and the tip 46a is pressed in the direction of arrow A in FIG. Set. Next, the bolt 44a is screwed to press the fixing member 36a outward in the radial direction of the cutter body 10 to mount the tip 46a on the mounting portion 18a. Meanwhile, adjusting screw 5
4b is screwed into the screw hole 32b, and 46
b is pressed in the direction of arrow B in the drawing to separate the tip 46b from the tip 46b by a predetermined distance (see FIGS. 4 and 5). Then, the bolt 44b is screwed to mount the chip 46b on the mounting portion 18b via the fixing member 36b. In this way, the cutting edges 48a, 48b of the respective tips 46a, 46b
The distance H is adjusted according to the axial length of the crank pin 58.

Next, if the rotary drive shaft 60 directly connected to the rotary drive mechanism in which the cutter body 10 is mounted is rotated through the bolt insertion holes 16a to 16f provided in the cutter body 10,
The cutter body 10 rotates in the direction shown by the arrow in FIG. And this rotating cutter body
When the 10 is displaced closer to the crank pin 58 side, a plurality of chips 46a and 46b mounted on the respective mounting portions 18a and 18b are provided.
The cutting blades 50a, 50b cut a predetermined portion of the crank pin 58, while the cutting blades 48a, 48b perform cutting with extremely high dimensional accuracy in the axial direction of the crank pin 58. Furthermore, this cutter body 10 in a predetermined direction,
That is, when the respective 46a and 46b are displaced so as to come into contact with the entire outer peripheral portion of the crank pin 58, the outer peripheral portion of the crank pin 58 is suitably cut by the plurality of chips 46a and 46b. In this case, the chips 46a, 46b
Thus, the scraps scraped off from the crank pin 58 are smoothly guided to the outside through the escape grooves 35a and 35b of the cutter body 10. It is also possible to displace the crankshaft while rotating the cutter body 10 and cut the entire circumference of the crank pin 58 with the chips 46a and 46b.

By the way, when the length of the crank pin 58 in the axial direction is different, it can be easily dealt with by the following procedure. That is, the bolts 44a and 44b fixing the fixing members 36a and 36b are once loosened, and then the adjusting screws 54a and 54b.
Of the tips 46a, 46b which are screwed in a predetermined direction to contact the tapered portions 56a, 56b, to be precise, the cutting edge portions 48a, 48
The distance H from b is adjusted according to the length of the new crank pin 58. The bolts 44a and 44b are screwed into the screw holes 26a,
26b is screwed into the chip 46a through the fixing members 36a and 36b,
After the 46b is firmly fixed to the mounting portions 18a, 18b, the new crank pin 58 is cut as described above.

In this case, the side views 40a, 40b of the fixing members 36a, 36b are inclined corresponding to the surface portions 28a, 28b of the mounting portions 18a, 18b. For this reason, the fixing members 36a and 36b are not attached to the bolts 44
If the tips 46a and 46b are pressed outward in the radial direction of the cutter body 10 via a and 44b, the respective tips 46a and 46b are attached to the mounting portions 18a and 18b.
Surface portions 34a, 34b and the surface portions 42a, 42 of the fixing members 36a, 36b.
It can be firmly pressed and held by using b. Furthermore, the adjusting screws 54a, 54b are suitably guided through the guide grooves 30a, 30b, and the adjusting screws 54a, 54b are screwed in the same direction as the bolts 44a, 44b (outward in the radial direction of the cutter body 10). Configured to do so. Therefore, the position adjustment work of the chips 46a and 46b described above is further simplified,
Further, it will be easily understood that the positions of the chips 46a and 46b are accurately adjusted.

When the chips 46a and 46b are damaged and are to be replaced, the same procedure as described above may be performed.

In the present embodiment, the cutter body having a plurality of chips on the inner peripheral portion is described, but if, for example, a mounting portion is formed on the outer peripheral portion of the cutter body, and the chips and the fixing member are attached to this, the same effect can be obtained. It is possible to obtain various effects.

As described above, according to the present invention, mounting portions having a predetermined shape are formed on the outer peripheral portion or the inner peripheral portion of a circular cutter body, and a plurality of chips are connected to these mounting portions via a fixing member. At the same time, the tip can be finely adjusted in the axial direction of the cutter body on the tapered surface of the adjusting screw by screwing the adjusting screw. Therefore, as the tip position adjusting means, it suffices to actually use an adjusting screw having a tapered surface, and it becomes possible to adjust the position of the cutting tip with a simple structure, and especially when a large number of cutting tips are mounted. It is possible to effectively prevent the manufacturing cost of the tip position adjusting means from rising. Moreover, since the adjustment of the chips alternately provided on the cutter body is performed in the same direction (radial direction of the cutter body), the work for adjusting the positioning of the chips is further simplified and the time required for the work is shortened. This allows efficient tip position adjustment work. That is, according to the present invention, it is possible to extremely easily and accurately adjust the interval between the chips with respect to the axial direction, and thus, for example, it is possible to process the crankshaft with high accuracy, and various sizes are different. There is an advantage that it can respond well even to the crankshaft of.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. Of course.

[Brief description of drawings]

FIG. 1 is a partially omitted perspective view of a cutting tool according to the present invention. FIG. 2 is a partial schematic explanatory view of the tool of the present invention. FIG. 3 is a partial plan view of the tool of the present invention. FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5 is an explanatory view showing a mounted state of the tip constituting the tool of the present invention. 10 ... Cutter body, 18a, 18b ... Mounting part 20a, 20b, 22a, 22b ... Opening part 26a, 26b ... Screw hole, 32a, 32b ... Screw hole 36a, 36b ... Fixing member, 46a, 46b …… Tips 54a, 54b …… Adjustment screws

Claims (2)

[Claims] 1. A plurality of mounting portions each having a groove of a predetermined shape formed on an inner peripheral portion of a cutter body, and a cutting tip disposed in the mounting portions, the mounting portions being inserted into the mounting portions. And a tip position adjusting means capable of adjusting the position of the cutting tip in the axial direction of the cutter body, the tip position adjusting means constituting the attachment portion and having an arc shape. Corresponding to an inner wall surface of the guide groove, a screw hole formed in a surface portion extending in the rotation direction of the cutter body corresponding to the center of the guide groove, and an inclined surface of the cutting tip. Has a tapered portion that
An adjusting screw that presses the inclined surface of the cutting tip with the tapered surface by screwing into the screw hole while fitting in the guide groove to adjust the position of the cutting tip in the axial direction. A cutting tool characterized by that. 2. The tool according to claim 1, wherein the attachment portions are alternately provided from both side portions of the cutter body, and the cutting tip is provided with the cutting tip under the action of the tip position adjusting means. A cutting tool, characterized in that the cutting width of the cutting tip is adjusted by displacing them so as to be oriented in the axial direction of the body and separated from each other.