JPS6257812A - Cutting tool - Google Patents

Abstract

PURPOSE:To enable a crankshaft or the like to be high accurately machined by a tool simplifying its constitution, by providing a saw tooth-shaped mounting part in the periphery or the internal periphery of a disc-shaped cutter body while mounting plural edged parts to the saw tooth-shaped mounting part and enabling the edged parts to be finely adjusted in the axial line direction of the body. CONSTITUTION:A tool, temporarily stopping edged parts 28a, 28b by bolts 53a, 53b to the saw tooth shaped mounting part of a cutter body 10 while screwing adjusting screw threads 54a to hole parts 26a and pressing the edged parts 28 to the bottom by head parts of said adjusting screw threads 54a, sets positions of tips 46a. Next the tool, turning the bolt 53a, secures by its head part the edged art 28a to the mounting part through a loose hole. While the tool, turning the adjusting screw thread from the bottom to press by its head part the edged part 28b to the upper and separating a tip 46b from the tip 46a by the predetermined dimension, secures the edged part 28b through a loose hole by turning the bolt 53b. Accordingly, the tool enabling a space of the tips 46a, 46b to be adjusted to the width diemension of a crank pin and turning the cutter body 10 to be displaced to a crank pin side, can perform high accurate machining.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting tool, and more particularly, a plurality of cutting edges are arranged at equal intervals on the inner circumference or outer circumference of a disc-shaped cutter body, and the present invention relates to a cutting tool. The present invention relates to a cutting tool in which a blade can be aligned in the axial direction of the cutter body.

Generally, when machining the outer periphery of a pin, journal, etc. that constitutes a crankshaft, a circular cutting tool is rotated under the action of a rotational drive source, and the crankshaft or tool is relatively displaced in a predetermined direction. Then, the tool cuts workpieces such as bottles and journals.

Conventionally, such cutting tools include tools in which a plurality of blades are integrally formed with a cutter body,
A tool is used in which the blade portion is detachably attached to a cutter body. However, with the former one-piece tool, if a large number of workpieces are to be cut, the cutting edge will wear out, and even if only the cutting edge needs to be replaced, the entire tool must be replaced. There are disadvantages that cannot be avoided. In addition, if the type of workpiece is different, it goes without saying that the tool itself must be replaced depending on the type of workpiece, and for this purpose, it is necessary to prepare many types of tools depending on the type of workpiece. First, it has been pointed out that the method is not economical in practice.

On the other hand, there are two types of tools whose blade part is separated from the cutter body: one in which the cutting tip is directly attached to the cutter body, and the other in which the blade part to which the cutting tip is fixed is disposed on the canter body. be. Therefore, if high-precision cutting is desired, it is necessary to provide a cutter body with a large number of chips or blades, and to form the canter body and the chips or blades with high precision. In particular, when machining a crank bottle or the like, it is necessary to machine the outer circumference with good precision and also to machine the crank pin in the axial direction extremely accurately with a desired dimensional precision.

For this reason, in this type of canter body, the attachment part for fixing the tip or blade is formed with high precision, and the tip or blade itself is fixed in the width direction of the cutter body, that is, in the axial direction. The dimensions must be ensured with high accuracy.

In the end, the manufacturing work for any of the canter bodies, tips, or blades must be done with precision, which is extremely complicated, takes a lot of time, and the tools are quite expensive. Defects arise.

In this case, it is also possible to fix the tip or blade part to the cutter body and then grind the cutting blade part integrally to make the dimensions of the cutter body at the cutting blade part uniform in the width direction. It is extremely difficult to align the blade portions uniformly, and therefore requires a skilled technique, which poses the disadvantage of not being able to be mass-produced.

The present invention has been made to overcome the above-mentioned disadvantages, and includes forming a stepped portion of a predetermined shape on the outer circumference or inner circumference of a disc-shaped canter body, and a plurality of blade portions on the stepped portion. are arranged in series, and the positions of these blades are adjustable in the axial direction of the canter body, thereby providing a cutting tool that is configured to perform highly accurate machining work on a workpiece with a simple structure. The purpose is to provide.

In order to achieve the above-mentioned object, the present invention forms a plurality of attachment parts consisting of grooves of a predetermined shape on the outer circumference or inner circumference of a cutter body, and attaches a blade part to which a cutting tip is fixed to the attachment parts. In addition, the blade part is configured to be adjustable in position in the axial direction of the canter body via a blade position adjustment means.

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

1 to 3, reference numeral 10 indicates a canter body constituting a cutting tool according to the present invention. A large diameter opening 11 is formed in the center of the cutter body 10, and bolt insertion holes 12a to 12h are formed at equal intervals near the outer peripheral edge of the opening 11. Screw holes 14a to 14d are provided between the holes 12a and 12b, 12C and 12d, 12e and 12f, and 12g and 12h.
is engraved.

A plurality of blade attachment portions 16a and 16b are alternately formed at equal intervals from the center of the cutter body 10.

In this case, the mounting portions 16a and 16b each have a sawtooth shape. That is, the mounting portions 16a, 16b are composed of a reference surface 18a1.18b and inclined surfaces 20a, 20b, and the short reference surfaces 18a, 18b are oriented approximately toward the center of the cutter body 10. On the other hand, the reference surface 18
a, 18b, a long inclined surface 20 inclined in the rotational direction of the cutter body 10 at an angle θ° smaller than a right angle;
a, 20b have one end connected to the adjacent reference plane 18b, 18.
I am facing a. Furthermore, (on the slope 20a,
In the mouth, there is a screw hole 21a on the upper side in the width direction of the canter body 10.
The screw hole 21a is bored at a predetermined angle with respect to the inclined surface 20a so as to be substantially parallel to the reference surface 18a (see FIG. 3). On the other hand, a screw hole 21b substantially parallel to the reference surface 18b is bored in the inclined surface 20b at the lower side in the width direction of the cutter body 10.

A screw hole 24a constituting a blade position adjusting means 22a is bored in the upper surface of the cutter body 10 in the vicinity of the mounting portion 16a, and a hole having a predetermined depth is formed at one end of the screw hole 24a. 26a is formed in communication.

Further, a mounting portion 16 is provided on the lower surface of the cutter body 10.
The screw hole 2 constituting the blade position adjusting means 22b is adjacent to b.
4b and hole 26b are bored in communication.

Note that the holes 26a and 26b have a portion that is connected to the reference surface 18.
a, 18b and the inclined surfaces 20a, 20b, and the respective holes 26a, 26b.
The diameter of the adjustment screw is selected to be the same as the diameter of the head of the adjustment screw described later.

Therefore, blade portions 28a and 28b each having a substantially columnar shape are attached to the respective attachment portions 16a and 16b. As shown in FIG. 4a, the blade portion 28a has a reference surface 18 of the mounting portion 16a.
a and mounting surfaces 30a and 32a corresponding to the inclined surface 20a.
The mounting surfaces 30a and 32a form the mounting portion 1.
6a, it is configured to be inclined at an angle θ° smaller than 90'. Furthermore, the mounting surfaces 30a and 32
A retaining portion 36a is formed by cutting out a predetermined length of the surface portion 34a provided between the surface portion 34a and the surface portion 34a. On the other hand, blade part 2
A chip attachment groove 38a is formed at a corner of the upper end of the chip 8a, that is, at a portion diagonal to the notch of the surface portion 34a. An escape groove 39a is provided at the upper right end of the groove 38a in the figure, and a screw hole 10a is formed in the surface defining the groove 38a. Note that an escape groove 42a is provided on one surface of the blade portion 28a, and the slope 20 is provided with an escape groove 42a.
A bolt insertion hole 44a corresponding to the screw hole 21a of a is bored. In this case, the diameter of the hole 44a is selected in advance to be larger than the diameter of the bolt itself by a predetermined dimension in order to allow the bolt (described later) to be inserted therein to be relatively displaced. put. Then, the groove portion 38
Position the cutting tip 46a at point a, and then tighten the countersunk bolt 48
A is inserted into the tapered hole 50a of the tip 46a, and its tip is screwed into the screw hole 40a to fix the tip 46a to the blade portion 28a. Cutting blade portions 51a are formed at both ends of the tip 46a, and cutting blade portions 5 bulge outward through step portions at the upper and lower ends of the tip 46a.
Form 2a. Note that the cutting edge portion 51 of the thousand knobs 46a
A, 52a are respectively made to slightly protrude outside from the groove portion 38a.

Incidentally, the blade portion 28b is constructed in substantially the same manner as the blade portion 28a described above, and therefore, as shown in FIG.
32b is provided, and the blade portion 28a is provided on the surface portion 34b.
An engagement surface (not shown) is formed from the opposite direction. A tip attachment groove 38b is provided in the upper part of the blade portion 28b, and a cutting tip 46b is fixed to this groove 38b via a countersunk bolt 48b. One of the cutting edges 51b and 52b of the tip 46b is made to protrude slightly in the same way as the tip 46a.
6b, it goes without saying that the countersunk bolts 48a, 48b may be replaced by brazing, etc. to secure them to the respective grooves 38a, 38b.

In the hole 44a of the blade part 28a configured in this way)
53a, and its tip is screwed into the screw hole 21a provided in the inclined surface 20a to attach the blade portion 28a to the mounting portion 16a.
Attach to. Further, an adjusting screw 54a is screwed into the screw hole 24a, and the head of the adjusting screw 54a is brought into contact with the engaging portion 36a of the blade portion 28a to position the blade portion 28a in the axial direction. On the other hand, the blade portion 28b is also attached to the attachment portion 16b in the same manner as the blade portion 28a.

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

Therefore, first, the positions of the respective blade portions 28a and 28b are adjusted to correspond to the workpiece, for example, the crank bin 56. That is, the bolts 53a, 53b are slightly screwed into the screw holes 21a, 21b to temporarily fix the blade parts 28a, 28b,
The adjustment screw 54a is inserted into the screw hole 24a, and the blade portion 28a is pressed downward in FIG. 5 through the head of the adjustment screw 54a, thereby setting the position of the tip 46a fixed to the blade portion 28a. Next, screw the blade 53a into the blade part 28a.
is attached to the mounting portion 16a. On the other hand, the adjustment screw 54b is screwed into the screw hole 24b, and the blade portion 28b is pressed upward in the figure through the head of the adjustment screw 54b, so that the tip 46b is inserted into the tip 46.
a for a predetermined period of time (see Figure 6). Next, the bolt 53b is screwed in to attach the blade portion 28b to the mounting portion 16b (see FIG. 5). In this way, the interval H between the cutting edges 52a, 52b of the respective tips 45a, 46b is adjusted in accordance with the length of the crank bin 56 in the axial direction.

Next, by rotating the rotary drive shaft 58 directly connected to the rotary drive mechanism to which the cutter body 10 is attached via the bolt insertion holes 12a to 12h and screw holes 14a to 14d provided in the cutter body 10, the cutter The body 10 rotates in the direction shown by the arrow in the figure.

If the rotating canter body 10 is moved closer to the crank bin 56, the respective mounting portions 16a, 1
The cutting edges 51a and 51b of the plurality of chips 46a and 46b attached to the tip 6b cut a predetermined portion of the crank bin 56, while the cutting edges 52a and 52b cut the crank bin 56 in the axial direction. On the other hand, cutting is performed with extremely high dimensional accuracy. Further, by displacing the cutter body lO in a predetermined direction, that is, in such a manner that the tips 46a and 46b are in contact with the entire outer periphery of the crank bin 56, the outer periphery of the crank bin 56 can be The cutting process is preferably performed by the chips 7' 46a and 46b.

In this case, it is also possible to displace the crankshaft while rotating the cutter body 10 and cut the entire circumference of the crank bin 56 with the tips 46a and 46b.

By the way, if the lengths of the crank bins 56 in the axial direction are different, this can be easily handled by the procedure shown below. That is, after once loosening the pins 53a, 53b fixing the blade parts 28a, 28b, the respective adjustment screws 54a, 54b are screwed in a predetermined direction to contact the head part of the blade part 28a, The distance between the tips 46a and 46b of 28b, more precisely, the distance H between the cutting edges 52a and 52b
is adjusted according to the new length of the rank bin 56.

Then, after screwing the bolts 53a, 53b into the screw holes 21a, 21b and firmly fixing the blade parts 28a, 28b to the mounting parts 16a, 16b, the cutting process is performed on the new rank bin 56 as described above. . In this case, since the heads of the adjusting screws 54a, 54b fit into the holes 26a, 26b without any gaps, it is possible to accurately adjust the positions of the cutting blades 52a, 52b.

In the above embodiment, a cutter body having a plurality of blades on the inner periphery is described.Next, as a second embodiment, a cutting tool having a plurality of blades on the outer periphery of the cutter body will be described below. Shown below.

That is, as shown in FIG. 7, a large diameter opening 92 is provided at the center of the cutter body 90, and bolt insertion holes 94a to 94a are provided at equal intervals from the center of the cutter body 90. Drill 94d. The outer circumferential portion of the canter body 90 includes sawtooth attachment portions 96a corresponding to the attachment portions 15a and 16b shown in the first embodiment.
96b is formed. In this case as well, the mounting portions 16a, 1
6b, the short reference surfaces 98a, 98b and the long sloped surfaces 100a, 100b are inclined at a predetermined angle.
These inclined surfaces 100a and 100b have reference surfaces 98a and 98.
Screw holes (not shown) are bored approximately parallel to b and at different height positions. In addition, in the vicinity of the attachment part 96a, there is a screw hole and a hole 104a (not shown) from the L part of the cutter body 90.
On the other hand, in the vicinity of the receiving portion 96b, a screw hole (not shown) and a hole 10 are formed from the lower part of the canter body 90.
4b is connected.

Therefore, the blade parts 28a and 2 are attached to the respective mounting parts 96a and 96b.
Attach 8b. The blade parts 28a, 28b have the same construction as shown in FIGS.
b is inserted, and the tips thereof are screwed into screw holes (not shown) in the inclined surfaces 100a, 100b, so that the blade portions 28a, 28b are firmly attached to the mounting portions 96a, 96b. Further, the adjusting screws 108a, 108b are screwed into screw holes (not shown), and their heads are inserted into the holes 104a, 104b, and the heads are engaged with the engaging parts (not shown) of the blade parts 23a, 28b. Adjust the positions of chips 45a and 46b.

In such a configuration, the cutter body 90 is attached to a rotation drive JJJ mechanism (not shown) through the holes 94a to 94d, and while the cutter body 90 is rotated in the direction of the arrow, for example, a crank bin (not shown) is closely displaced. Then, a predetermined cutting process is performed on the crank pin using the respective chips 46a and 46b.

As described above, according to the present invention, attachment portions having a predetermined shape are formed on the outer circumference or inner circumference of a disc-shaped cutter body, a plurality of blade portions are connected to these attachment portions, and the blades are The cutter body can be finely adjusted in the axial direction of the cutter body. Therefore, there is no need to manufacture the cutter body or the blade itself with high precision in order to align the edges of the blade.

That is, according to the present invention, it is possible to sharpen and precisely adjust the interval between chips in the axial direction, and therefore, with a simple configuration, it is possible to process, for example, a crankshaft with high precision, and also to adjust the dimensions. This has the advantage that it can be easily applied to various crankshafts with different values.

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

[Brief explanation of the drawing]

Fig. 1 is a partially omitted perspective view of a cutting tool according to the present invention, Fig. 2 is a partially omitted plan view of the present invention tool, and Fig. 3 is a partially omitted perspective view of a cutter body constituting the present invention tool. , FIGS. 4a and 4 are perspective views of the blade portion constituting the tool of the present invention, and FIGS. 5 and 6 are explanatory views showing the installed state of the blade portion,
FIG. 7 is a partially omitted perspective view showing a second embodiment of the cutting tool according to the present invention. 10...Cutter body 16a, 16b...Mounting part 18a, 1sb-...Reference surface 20a, 20b
--- Inclined surfaces 22a, 22b...Blade position adjustment means 24a, 24b =--Threaded holes 26a, 26b
--- Hole portions 28a, 28b,...Blade portion

Claims (4)

[Claims] (1) A plurality of attachment parts consisting of grooves of a predetermined shape are formed on the outer circumference or inner circumference of the cutter body, a blade part with a cutting tip fixed to the attachment part is attached, and the blade part is attached to the blade part. A cutting tool characterized in that the cutter body is configured to be adjustable in position in the axial direction via a position adjustment means. (2) In the tool according to claim 1, the blade position adjusting means includes a hole portion partially facing the groove portion, a screw hole coaxially drilled in the hole portion, and a screw hole for pressing the blade portion. an adjustment screw, and by screwing the adjustment screw into the screw hole and bringing the head of the adjustment screw into the hole, the blade portion exposed in a part of the hole can be adjusted to the head. A cutting tool in which the position of the blade portion is adjusted by pressing the blade. (3) In the tool according to claim 2, a portion of the blade part that fits into the corner defined by the reference surface and the inclined surface is cut out to form an engagement surface, and the adjustment screw is A cutting tool in which the position of the blade is adjusted by displacing the blade by pressing the engagement surface with the head. (4) In the tool according to claim 1 or 2, the blade position adjustment means are provided alternately from both sides of the cutter body, and under the action of the blade position adjustment means, the blade position adjustment means are provided alternately from both sides of the cutter body. A cutting tool in which the cutting width of cutting tips constituting the blade portion is adjusted by being displaced so as to be oriented in the axial direction of a cutter body and spaced apart from each other.