JPS59205205A - Cutting tool - Google Patents

Abstract

PURPOSE:To reduce cutting resistance at work cutting while cancelling out said resistance with each other and to economize in energy at that time by providing respective blade parts oppositely inclined with each other on the tips of one or more shanks provided on a cutter holder. CONSTITUTION:Two shanks 2 are removably attached to a cutter holder 1 by a machine tool such as a working lathe by means of mounting bolts 3, and each of blade parts 4a, 4b oppositely inclined with each other is provided on each tip part of each shank 2. And, the infeed of this blade part 4a for rough machining going ahead in the feed direction is formed shorter than that of the blade part 4b for finishing going behind. Accordingly, feed components Fr, F1 by respective blade parts 4a, 4b cancel out with each other and reduced, and thus cutting resistance is also reduced, enabling energy saving to be realized with a simple operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cutting tool used for cutting in a machine tool such as a lathe, and particularly relates to a cutting tool that reduces cutting power.

[Technical background of the invention and its problems]

Generally, a cutting tool in a machine tool receives cutting resistance from a workpiece (workpiece) during cutting, and a lot of power is consumed by this.

That is, as shown in FIGS. 1 to 4, in the conventional cutting tool, for example, a shank as a cutting tool is fixed to the tool post L of a lathe with a mounting bolt J, and a super-long bolt is attached to the tip ja of the shank. A hard tip blade is attached by brazing.

Therefore, the above-mentioned cutting tool presses the outer peripheral surface of the rotating workpiece W by an amount of protrusion t, and at the same time reduces the feed amount f in the axial direction (lengthwise direction) of the workpiece W. This allows the workpiece W to be cut to a predetermined size. That is, as shown in FIG. 2, when cutting the workpiece W with a feed amount f using a single blade, a feed component force (cutting resistance force) Fγ in the opposite direction to the feed amount f is applied. receive.

On the other hand, as shown in FIG. 3, a shank cutter using an inclined knife with a blade portion slanting downward to the left receives a feed component force Fγ as a reaction force against the feed amount f, but on the other hand, As shown in FIG. 1, a shank cutter with a slanted cutter having a blade portion slanting downward to the right receives a feed component force Fi in the same direction as the feed amount f.

Further, the absolute value of the inclination angle α of the blade part K is in the range of 0 to qo'', and the larger the inclination angle α is, the more the above-mentioned feed component force F
γ, IIJJ also becomes larger, and the above-mentioned inclined knot has a larger feed force Fγ, compared to a normal cutting tool without an inclination.
Requires F4. On the other hand, as shown in FIGS. 5 and 6, in order to increase cutting efficiency, one cutting tool is sometimes used in the tool rest.

That is, in another specific example shown in FIGS. 5 and 6, one shank is fixed to the tool rest l with each mounting pole j, and a rough machining tool is attached to the tip a of both shanks. Blade pa
The finishing blade + b'l is attached with approximately the same inclination angle.

As a result, by applying feed in the same direction, rough cutting and finishing cutting can proceed at the same time, but in this case, compared to the specific example of one cutting tool mentioned above, the amount of feed is The force Fγ becomes approximately λ times as large, and a feed power corresponding to this is required.

In general, the finished surface roughness (Rmax) is expressed as Rmax 'p f' 7g 7 from the relational expression between the feed amount (f) and the nose R (γ) of the cutting tool.

Therefore, in order to obtain a good finished surface, it is necessary to reduce the feed amount f or increase the nose radius of the cutting tool.

However, since the preceding rough machining blade part +a and the following finishing blade part q11 in the other specific examples mentioned above are fixed to the same tool post l, the feed amount f of the cutting tool is If it is made smaller, the cutting efficiency during rough machining will decrease, and it will be difficult to satisfy both machining efficiency and finished surface roughness at the same time. - On the other hand, in another conventional example shown in FIG. 7 and FIG.
is removably fixed by a holding member S,
As shown in FIG. There are disadvantages such as increased size.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and includes providing a tool rest with at least/or more shanks, and attaching each blade part inclined in opposite directions to the tip of the shank. The present invention provides a cutting tool that reduces cutting resistance by offsetting each other when cutting a workpiece, and also aims to save energy during cutting.

[Summary of the invention]

The present invention provides a tool rest with at least one or two or more shanks, each tip of the shank is provided with each blade portion inclined in opposite directions, and the blade portions are provided with blades inclined in opposite directions. The cutting protrusion of the blade is made shorter than the cutting protrusion of the trailing blade to offset and reduce the cutting resistance.
It is designed to save power.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment. Note that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

In FIGS. 9 and 10, reference numeral l indicates a tool rest for a machine tool such as a lathe, and this tool rest l
A single shank is removably attached to each mounting port J, and each tip J of each shank
In a, each blade part Fa and 4/'b are inclined in opposite directions.
The cutting protrusion amount of the rough machining blade portion ea, which precedes in the feeding direction, is formed to be shorter than the cutting protrusion amount of the finishing blade portion tlb, which follows.

In other words, the leading rough machining blade part Va has a cutting protrusion tt in the cutting direction that is greater than the trailing finishing blade part llb.
It is shortened by t and fixed.

Also, the inclination angle α of the leading blade portion 1a is −30 to −70”
The inclination angle α of the trailing blade portion tlb is set within the range of 30 to 70°.

Furthermore, since the leading blade part +a cuts by the cutting amount t from the surface of the workpiece W, and the trailing blade part Vb cuts by the cutting protrusion amount t, both the above-mentioned shanks The double-edged portions lIa and llb are inclined in opposite directions,
Moreover, it is possible to cut to a depth of (1, +1.) from the surface of the workpiece W.

Therefore, now, the workpiece W with a diameter D0 is cut to the diameter (-Do-2t1) by the cutting depth fl't+ of the rough cutting blade lIa, and then the finishing The work W is finally cut to the diameter (-D, -2t,) by the cutting depth t of the blade part pb. In this case, chips fall to the lower right on the leading shank where the blade portion IIa is inclined downward to the right, and on the other hand, chips fall to the lower left on the trailing shank where the blade portion +b is sloped downward to the left. Further, during cutting, the depth of cut is larger in the rough cutting blade portion lIa than in the finishing blade portion Ilb. In other words, by setting the relationship between the depth of cut to be 1:>1°, the finishing accuracy of the finished surface is improved, and on the other hand, the double-edged portions Fa and Dab of both shank joints are mutually Since they are inclined in opposite directions, the cutting forces cancel each other out, thereby saving power. That is, the cutting resistance due to the double-edged portions ea and 4Zb of the above-mentioned two shank joints is, as shown in Fig. 1/ and Fig. 72, each feed component force Fγ, 77! , the directions in which they act cancel each other out. In other words, a rightward feed component force Fγ is generated in the left downward blade portion +b, and a leftward feed component force F4 is generated in the right downward blade portion G. Furthermore, when the absolute value of the inclination angle α is in the range of θ to 90'', the larger the angle, the larger the feed component forces Fγ and F become, and each inclined blade lIa , da b has a larger feeding force.

Therefore, as shown in Fig. 1/ and Fig. 12, the respective feeding forces Fr and FfL act in directions that cancel each other out, so the cutting resistance is reduced and the two shank units are fixed. The power required to transport the turret l is saved.

Next, in another embodiment of the present invention shown in FIGS. 73 and 14', a shank head is integrally formed, and the tip part 2a of this shank head is formed by branching into two parts. Each blade portion lIa inclined in the opposite direction to this image tip-a
, lIb'i are attached, and the cutting protrusion of the leading blade part tIa in the feeding direction is formed to be shorter than the cutting protrusion of the trailing blade part lIb, and is the same as the above-mentioned specific example. It constitutes a structure.

On the other hand, number one! Another embodiment of the present invention shown in FIG.
The amount of cutting protrusion of the leading blade part DA in the feeding direction is made to be smaller than the cutting protrusion amount of the trailing blade part v'b, and each of the blade parts of the above-mentioned specific example! Compared to a and +b,
In this specific example, each of the blade portions Fa and ebFi is formed to be inclined in opposite directions, thereby reducing the size of the entire shank. In addition, Fig. 77 and Fig. 7g are
Feed component force Fγ of the specific example shown in Fig. 1j and Fig. 16
.

This is a diagram illustrating the relationship with l, and the content is the same as the specific example described above.

Next, another embodiment of the present invention shown in FIG. 1q and FIG.
Attach each shank to the tip 2 of each shank.
! Each blade part 4Za, lI' inclined in opposite directions to L
b, and the cutting protrusion amount of the leading blade part Qa in the feeding direction is formed to be shorter than the cutting protruding amount of the trailing blade part Ilb, and is the same as the specific example described above. With this, during cutting, each feed component force Fγ, FQ acts in a direction that cancels each other out, thereby reducing the cutting resistance.

Next, another embodiment of the present invention shown in FIG. 27 is one in which the cutting tool shown in the first left figure is used when performing internal diameter machining of the workpiece W, and the cutting tool shown in the first left figure is used. The blade part is formed in a curved shape with a radius of curvature S smaller than the radius of curvature R of the inner diameter of the workpiece W. Further, in this specific example, the end face can be cut using a normal lathe or a vertical lathe.

On the other hand, another embodiment of the present invention shown in FIG.
It is applied to cutting processing by boring work, and a pair of shanks are provided on a rotating tool rest l so as to protrude in the diametrical direction, and each shanks slanted in opposite directions is attached to the tip 2a of both shanks. Blade part a.

In addition, the cutting protrusion amount of the leading blade portion lIa in the feeding direction is made shorter than the cutting protruding amount of the trailing blade portion Ilb.

〔Effect of the invention〕

As described above, according to the present invention, the turret l is provided with at least l or more shanks, and each of the blades d a tilted in opposite directions at the tip a of the shanks a,
II'b, and the blade part Ilb which follows the cutting protrusion amount of the blade part IIa which precedes in the feeding direction.
Since it is formed to be shorter than the cutting protrusion amount, the feeding force by each of the blade parts 1a and 41b is Since r and Fju are reduced by canceling each other out, the cutting force is reduced, making it possible to save energy, and the structure is simple, so handling is easy. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional cutting tool, FIG. 2 is a side view of the same as above, FIGS. 3 and 3 are diagrams for explaining the action of the cutting tool, and FIG. top view of the cutting tool,
FIG. 6 is a front view of the same as above, FIG. 7 and FIG. 3 are perspective views of other conventional cutting tools, FIG. 6 is a perspective view of a cutting tool according to the present invention, and FIG. Figure 1/Figure 72 is a diagram for explaining the present invention in detail.
Figures 22 to 22 are diagrams showing other embodiments of the present invention. /...Turret, Co...7 Yank 1.2a, u'b.
・Tip, J...Mounting bolt, 4Za, 4<'b・
・Blade part.

Claims (1)

[Claims] The turret has at least a shank of at least 1 or 1,
Each blade part inclined in opposite directions is attached to the tip of this shank, and the cutting protrusion amount of the preceding blade part is greater than the cutting protrusion amount of the trailing blade part with respect to the feeding direction. A cutting tool characterized by its short shape.