JPH10263911A - Deep groove machining cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly apply fine and deep groove machining and prevent chip clogging occurring in the gap between a cutter and a work at the time of machining by setting the edge width in the range shallower than a chip pocket thicker by a specific size on one side than the thickness on the inner side (no- edge section). SOLUTION: A cutter main body 1 has a flank backward in the cutting direction from a cutting edge 2, and its shape is continued with the roundness 6 of a groove bottom between a chip pocket 5 and a cutting face 7 from a heel 4. The roundness 6 of the groove bottom is a circular arc with the radius of 2 mm or below. Since the value of the radius is reduced, the volume of an edge section is increased, and the rigidity of a cutter is increased. The thickness of a no-edge section is made thinner by 0.02-0.3 mm on one side (b) than the thickness (t) of 2 mm or below of the cutting edge 2. Chip clogging can be prevented at the time of groove machining due to the heterogeneity of the gap between a metal saw and a work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter suitable for processing deep grooves in metal, particularly for processing fine fins.

[0002]

2. Description of the Related Art A conventional technique of this kind is disclosed in, for example, "JIS Handbook Tool" (1989) issued by the Japan Standards Association.
Metal saws (P298 to P302) shown in the first edition of the first edition on April 12, 2012 are known.

The metal saw has a disk shape as shown in FIG.
It has. The thickness t is constant from the circumferential tip toward the center and has a flat shape. Outer diameter D is 32 ~
315 mm, and a boss hole 11 is provided at the center. The number of blades is the outer diameter D ≧ φ100 mm and the thickness t
= 1.6 mm, the range is from 48 to 80 sheets.

FIG. 3 shows how a groove is formed using a metal saw. A metal saw 9 is attached to a main shaft 12 of a processing machine through a boss hole, and is fixed by a collar 13 and a nut 14. The metal saw 9 also rotates with the rotation of the main shaft 12 of the processing machine. In this state, when the main shaft 12 of the processing machine moves, the metal saw 9 cuts the workpiece 15 to perform the groove processing. At this time, since the thickness of the metal saw is constant as described above, as shown in FIG.
Since the side surface of the metal saw 9 and the workpiece 15 are always in contact with each other, the cutting resistance increases, and smooth processing is difficult. Further, there is also a disadvantage that a deep groove cannot be machined because the cutting resistance is proportional to the depth of the groove.

As a countermeasure, there is a metal saw 16 provided with a back taper as shown in FIG. This metal saw has a shape in which the thickness t decreases from the outer peripheral portion toward the center (back taper), and the central portion is thinner on one side by C mm than the outer periphery.

FIG. 6 shows how a groove is formed by a metal saw having a back taper. By providing the back taper, the contact area between the side surface of the metal saw 17 and the workpiece 15 is reduced, and deep grooves can be processed. But,
In this case, due to the centrifugal force d due to the rotation of the metal saw 17 at the time of cutting, the chips 16 are blown to the outer peripheral portion of the metal saw 17,
A small portion (near the outer peripheral portion of the metal saw) is clogged in a small gap between the side surface of the metal saw 17 and the workpiece 15, and is rubbed by the rotating metal saw 17 to generate frictional heat.

As a result, as shown in FIG. 7, when the workpiece 15 is grooved while leaving the fins 18, there is a problem that the fins 18 are deformed (fall down) due to the frictional heat described above. (This phenomenon is remarkable in proportion to the depth of the groove. In addition, this effect is particularly significant when the groove is machined while leaving the thin fin. In this case, the fin has a wedge effect due to the chips. FIG. 9 shows a metal saw with a zigzag blade as shown in FIG.
There is a metal saw with a side cutter (side cutter) shown in.

The zigzag blade metal saw 19 shown in FIG. 8 has a blade thickness t1.
The metal saw blades are arranged in a staggered direction in order, and have a structure of a total thickness (= machining groove width) t2. This t2 and t
The gap generated by the dimensional difference of 1 increases the chip dischargeability. However, there is a problem that the workpiece to be grooved by the staggered blade metal saw 19 has poor accuracy and surface roughness.

In the metal saw 20 with a side cutter (side cutter) shown in FIG. 9, by providing a side blade 21 and a non-blade 22, the discharge of chips is enhanced by a gap generated by the step. However, the metal saw 20 with the side blades has a problem that the blade width becomes thick due to the stepped shape and is not suitable for narrow groove processing.

[0010]

As described above, the conventional technique has a problem in that there is no cutter suitable for narrow groove processing, especially for fine fin processing.

The present invention has been made to solve this problem, and an object thereof is to provide a narrow groove (groove width of 1 to 2 m).
m, groove depth 10-40mm) Processing can be performed smoothly, chip clogging that occurs between the cutter and the workpiece during processing is prevented, and thermal deformation of the workpiece due to frictional heat between the cutter and the chip To provide a cutter particularly suitable for fine fin processing and the like.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutter used for fine fin machining or the like, which has a flank rearward from a cutting edge in a cutting direction and has a clearance of 2 mm between a heel portion, a tip pocket and a rake face. A cutter having a shape connected by providing the following radius, and in the above cutter, the blade width in a range shallower than the tip pocket is made 0.02 to 0.3 mm thicker on one side than the thickness inside (no blade portion). The cutter further characterized in that, in the cutter, the thickness of the cutting edge has a shape tapered rearward from the tip of the cutting edge portion along the circumference. Outer diameter φ100 with cutter
This is achieved by a cutter characterized in that the number of cutting edges is in the range of 20 to 40 in a cutter of not less than mm.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cutter for deep groove machining according to an embodiment of the present invention.

The cutter body 1 has a flank rearward from the cutting edge 2 in the cutting direction, and has a shape formed by connecting the tip pocket 5 and the rake face 7 from the heel 4 with a roundness 6 at the groove bottom. The roundness 6 of the groove bottom is an arc having a radius of 2 mm or less,
By reducing the value of the radius in this way, the volume of the blade portion is increased, and the rigidity of the cutter is increased.

Further, the cutting edge thickness t (1.5 m in the present invention)
m), the thickness of the non-edged portion is set to one side b (0.0 in the present invention).
(2 to 0.3 mm). As a result, chip clogging at the time of groove processing due to non-uniformity of the gap between the metal saw and the workpiece as in the conventional back tapered metal saw can be prevented.

Further, the cutting edge height h is 3 to 4 m in the present invention.
m. Since the tip pocket depth H is 5 to 6 mm in the present invention, the cutting edge height h is set to a value smaller than the tip pocket depth H, thereby improving the removability of chips during cutting. It is aimed at.

Further, the thickness t of the cutting edge is tapered rearward from the cutting edge 2 along the circumference (in the present invention, a taper angle of 3 °), and the side edge relief a of the cutting edge is set to a. (In the present invention, 0.2 mm). This aims at reducing the contact area between the side surface of the cutter and the workpiece, and reducing the cutting resistance at the time of grooving.

Further, the cutter body 1 has an outer diameter of φ10.
In the case of 0 mm or more, the number of cutting edges is in the range of 20 to 40. (In the present invention, φ185 mm, the number of cutting edges is 30) This is because the number of cutting edges is greatly reduced compared to the conventional metal saw of 48 to 80, so that the tip pocket depth H can be increased, and the cutting time can be increased. To improve the removal of swarf. In addition to the above, the radius 6 of the groove bottom is reduced to a radius of 2 mm or less.
Increases the rigidity of the cutter.

FIG. 10 shows an example of machining using the deep groove machining cutter of the present invention.

The cutting chips 16 generated as the grooving by the deep grooving cutter 1 that has cut into the workpiece 15 progresses,
It is blown to the circumference by the centrifugal force d of the rotating cutter. The cutter according to the present invention has, on both sides, a clearance of the relief b with respect to the cutting edge of the non-cutting portion with respect to the cutting edge thickness t. The chips 16 blown to the circumferential portion of the cutter move along the gap, and are then discharged out of the cutter 1 through the gap 23 between the cutting edge and the tip pocket as shown in FIG.

With the above-described function, good groove processing without chip clogging can be performed.

Further, as shown in FIG. 1, the cutter according to the present invention has a shape in which the thickness of the cutting edge is tapered backward from the cutting edge 2 along the circumference, so that the side surface of the cutting edge is provided. Since the recesses a are provided on both side surfaces, cutting resistance at the time of grooving is reduced, and workability is improved.

Further, by reducing the number of cutting edges to 20 to 40, which is less than the conventional 48 to 80, the depth H of the chip pocket can be increased, the rigidity of the cutter is increased, and the chip discharge property is improved. Has been improved.

As described above, the chips are not clogged between the cutter and the workpiece during the grooving, and therefore, the thermal deformation of the workpiece due to the frictional heat between the chips and the cutter is not caused, and the appropriate Deep groove processing can be performed.

[0026]

According to the present invention, the removability of chips in deep groove processing is greatly improved, and thermal deformation of a workpiece due to friction between a cutter and residual chips can be prevented.

From the above effects, the present invention is particularly suitable for mass-producing fine fin machining by an automatic machining machine.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of a cutter for processing a deep groove according to an embodiment of the present invention.

FIG. 2 is a front view and a side view showing a conventional metal saw.

3A and 3B are a front view and a side view showing a state of groove processing using a conventional metal saw.

FIG. 4 is a front view showing a contact state between a metal saw and a workpiece during groove processing.

FIG. 5 is a front view of a metal saw provided with a back taper.

6A and 6B are a front view and a side view showing a state of groove processing by a metal saw with a back taper.

FIG. 7 is a front view showing a state of deformation (fin falling) of a workpiece during grooving.

FIG. 8 is a front view and a side view of a zigzag blade metal saw.

FIG. 9 is a front view and a side view of a metal saw with a side blade (side cutter).

10A and 10B are a front view and a side view showing an example of processing by a deep groove processing cutter.

FIG. 11 is a front view showing a state of chip discharge.

[Explanation of symbols]

1 ... cutter body, 2 ... cutting edge, 3 ...
Flank face, 4 ... heel, 5 ... tip pocket, 6 ... roundness of groove bottom, 7 ... rake face,
8: Boss hole, a: Escape to the side of the cutting edge, b: Escape to the cutting edge of the non-edged portion, t: Thickness of the cutting edge,
Cutting edge height, H: tip pocket depth, 9: metal saw body, 10: blade part, 11: boss hole,
θ: outer diameter dimension, 12: spindle of the processing machine, 13
... Color, 14 ... Nut, 15 ... Workpiece,
16: metal saw with back taper, C: back taper, d: centrifugal force, 17: chips, 18
... fins, 19 ... staggered blade metal saw, t1
... Metal saw blade thickness, t2 ... Full thickness (= machining groove width), 2
0: Metal saw with side blade (side cutter), 21: Side blade, 22: No blade, 23: Clearance between cutting edge and tip pocket.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kunori Imai 1 Horiyamashita, Hadano-shi, Kanagawa Prefecture General Computer Division, Hitachi, Ltd.

Claims (3)

[Claims] 1. A flank is provided rearward in a cutting direction from a cutting edge,
In a cutter with a radius of 2 mm or less provided between the heel portion, the tip pocket, and the rake face, the blade width in a range shallower than the tip pocket is set to 0.02 per side from the thickness inside (no blade portion). A cutter characterized by being thicker by 0.3 mm. 2. The cutter according to claim 1, wherein the thickness of the cutting edge is
A cutter characterized by having a shape that decreases in a tapered shape rearward from the tip of a cutting edge portion along a circumference. 3. A cutter according to claim 1, wherein the number of cutting edges is in the range of 20 to 40 in the cutter having an outer diameter of φ100 mm or more.