JP2001038516A - Groove machining cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine a plurality of grooves at the same time by suppressing cutting resistance. SOLUTION: First to eighth cutting edge parts 4 to 11 are arranged in a row with suitable intervals in between along an axial direction of a tool main body which is rotatable around an axis. Each of the first to fourth cutting edge parts 4 to 7 has two cutting edges arranged with a 180 deg. intetval and arranged in a row provided with a 90 deg. phase difference between each of the cutting edge parts 4 to 7. Each of the fifth to eighth cutting edge parts 8 to 11 has three cutting edges arranged with a 120 deg. interval and arranged in a row provided with a 60 deg. phase difference between each of the cutting edge parts 8 to 11. By this, a plurality of grooves is formed at the same time, and also cutting resistance is suppressed during cutting work because the plurality of cutting edge parts have different phases and the cutting work is suppressed from being performed at the same time for reducing impact during the cutting work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove machining cutter used for cutting a plurality of grooves and recesses in a hydraulic pipeline or the like.

[0002]

2. Description of the Related Art Conventionally, hydraulic circuits are provided in hydraulic circuits formed in various types of hydraulic equipment. The hydraulic circuits are used to change the direction of oil flow in the hydraulic lines and to mount components such as valves. An oil groove enlarged in diameter from the hydraulic line is formed in the circuit as appropriate. In order to form an oil groove having an enlarged diameter in such a hydraulic pipeline, a groove processing cutter such as a T-shaped slot cutter is used as an inner diameter processing cutter. In this groove cutter, etc., about six protruding parts are radially extended in the direction perpendicular to the axis as multi-blade blades at the tip of the tool body rotating around the axis, and each tip has a cutting edge. By inserting the tool body into a prepared hole such as a hydraulic pipeline and performing rotary cutting, an annular groove is formed on the inner wall of the prepared hole with multiple cutting blades.

[0003]

However, in the conventional cutter for groove machining, since only one blade portion is provided, it is difficult to form a plurality of grooves in a pilot hole or a longitudinal direction in a pipeline. Grooves must be cut one by one, which is complicated and time-consuming. Moreover, since the number of cutting blades is large, the chip discharging property is poor. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a groove machining cutter capable of simultaneously cutting a plurality of grooves.

[0004]

A grooving cutter according to the present invention has a plurality of blades projecting at intervals along an axial direction of a tool body rotatable around an axis, and each blade has a cutting blade. And the cutting blades of the plurality of blade portions are arranged so as to be out of phase in the circumferential direction around the axis. Inserting the tool body into the prepared hole of the work material, rotating the tool body while revolving along the prepared hole and the inner wall of the pipe line, and cutting the cutting body provided on the multiple blades of the tool body However, multiple grooves can be formed at the same time by intermittently cutting the inner wall, and because the phases of the multiple blades are shifted, the cutting blades of the multiple blades bite in time and High precision and efficient grooving by suppressing vibrations and chipping of cutting edges by reducing impact during cutting and reducing cutting resistance by suppressing cutting work material The cutting blade life is improved.

[0005] The phase may be set at equal angular intervals so that the cutting edge bites the work material at a constant angular interval between the plurality of blade portions. In this case, the setting of the cutting blade of each blade portion becomes easy. Alternatively, the phase may be set at unequally divided angular intervals so that the cutting edges bite the work material at irregular angular intervals among the plurality of blade portions. In this case, chatter vibration can be further suppressed by suppressing resonance of cutting resistance and impact during cutting, and machining accuracy can be improved. In these cases, a plurality of cutting blades provided in a single blade portion in the circumferential direction may be equally divided or unequally divided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The groove cutting cutter 1 shown in FIGS. 1 to 4 has a tool body integrally formed with a shaft portion 2 and a shank portion 3 and is rotatable around an axis O. It is formed with. The shaft portion 2 has a columnar shape, and a plurality of blade portions 4 to 11 protruding from the outer peripheral surface 2a of the shaft portion 2 in a direction substantially perpendicular to the axis O along the longitudinal direction thereof are arranged at intervals. ing. Eight blade portions 4 to 11 are provided in the figure. 8 blades 4
The first, second, third, and fourth blade portions 4, 5, 6, and 7 provided from the distal end of the shaft portion 2 to the proximal end side of the shaft portions 2 to 11 have an interval of 180 ° in the circumferential direction. Fifth, sixth, seventh and eighth blade portions 8, 9, 1
Numerals 0 and 11 are three-bladed cutting blades having an interval of 120 ° in the circumferential direction.

[0007] The blade portion of the two blades will be described. The first blade portion 4 is provided at the tip of the shaft portion 2 and is aligned with the axis O of the shaft portion 2 as shown in FIGS. A pair of protruding portions 13 protruding from the shaft portion 2 are formed at intervals of 180 ° in a direction substantially perpendicular to the shaft portion 2. Each of the protrusions 13 has a surface facing the rotation direction as a rake surface 13 a having an appropriate rake angle (0 ° in the figure), for example, a plane, and a surface facing the rear in the rotation direction as a flank 13 b forming a convex curved surface. Rake face 13a
The tip ridge line where the flank 13b intersects with the flank 13b is a cutting edge 14A. Therefore, the pair of first blades 4A, 4A are formed at 180 ° intervals in the circumferential direction. The first blade 4A of the first blade 4 has a substantially trapezoidal shape and extends along the axis O. In addition, the rake face 13a has a first cutting edge 4A.
The two side surfaces 13c and 13d are inclined inward so that the maximum width is obtained and the width gradually decreases toward the root, thereby facilitating grooving. Alternatively, in order to finish the wall surfaces of the grooves at the same time, the intersection ridge line between the side surfaces 13c and 13d and the rake surface 13a may be configured as a cutting edge so as to be orthogonal to the first blade 4A. In addition, the other rake portions 5 to 11 described later have the same rake face configuration. Further, the shape of each cutting blade of each blade portion described later is appropriately set according to the groove shape to be formed.

A second blade portion 5 is formed at an appropriate distance from the first blade portion 4 at the base end side of the shaft portion 2 in the longitudinal direction.
As shown in FIGS. 2, 3 and 4 (b), the second blade portion 5 is shifted in phase by 90 ° in the circumferential direction with respect to the first blade portion 4 so that the pair of projections 13 It protrudes from the outer peripheral surface 2a. A second cutting edge 5A extending along the axis O is formed at the tip of each projection 13, and a rake face 13a facing the rotation direction of the second cutting edge 5A and a flank face 13b facing the rotation direction rear of the second cutting edge 5A are formed. Is formed. The third blade portion 6 is provided at an appropriate distance from the second blade portion 5 on the longitudinal base end side of the shaft portion 2.
Are formed. As shown in FIG. 1 and FIGS. 3 and 4 (c), the third blade 6 has a pair of protrusions 13, 13 projecting from the outer peripheral surface 2a of the shaft 2 at the same phase position as the first blade 4. ing. A third cutting edge 6A extending along the axis O is formed at the tip of each projection 13, and a rake face 13a facing the rotation direction of the third cutting edge 6A and a flank face 13b facing the rotation direction rear of the third cutting edge 6A are formed. Is formed.

A fourth blade 7 is formed at an appropriate distance from the third blade 6 on the base end side of the shaft 2 in the longitudinal direction.
As shown in FIG. 2 and FIGS. 3 and 4 (d), the fourth blade 7 has a pair of protrusions 13, 13 projecting from the outer peripheral surface 2a of the shaft 2 at the same phase position as the second blade 5. ing. A fourth cutting edge 7A extending along the axis O is formed at the tip of each projection 13, and a rake face 13a facing the rotation direction of the fourth cutting edge 7A and a flank face 13b facing the rotation direction rear of the fourth cutting edge 7A are formed. Is formed. And the first, second, third and fourth cutting blades 4A, 5
A, 6A and 7A are arranged with a phase difference of 90 ° in the circumferential direction. In addition, on the outer peripheral surface 2a of the shaft portion 2,
A region in front of the rake faces 13a, 13a of the first cutting edge 4A and the third cutting edge 6A having the same phase in the rotational direction is cut linearly along the axis O to form a first pocket 15 having a flat or concave surface. Are formed respectively. Similarly, the rake face 13 of the second cutting edge 5A and the fourth cutting edge 7A having the same phase.
a, 13a are cut in a straight line along the axis O in the rotation direction area, and are flat or concave curved second pockets 1
6 are formed respectively.

Next, the blade portion of the three blades will be described with reference to FIGS. 1 to 4. The fifth blade portion 8 is provided at an appropriate distance from the fourth blade portion 7 at the base end side of the shaft portion 2 in the longitudinal direction. Are formed. The fifth blade portion 8 has three projections 18 projecting radially from the outer peripheral surface 2a of the shaft portion 2 at 120 ° intervals as shown in (e) of FIGS. And each projection 18
The fifth cutting edge 8A is formed at the tip of the fifth cutting edge 8A, and an appropriate rake angle (0 in FIG.
°), for example, a flat rake surface 18a is formed, and a flank 18b is formed on a convex curved surface facing rearward in the rotation direction. A flat or concave curved third pocket 19a is formed on the outer peripheral surface 2a of the shaft portion 2 located in front of each rake face 18a in the rotation direction. A sixth blade portion 9 is formed at an appropriate distance from the fifth blade portion 8 on the base end side of the shaft portion 2 in the longitudinal direction. The sixth blade portion 9 has the same configuration as the fifth blade portion 8 as shown in FIGS. 1, 2, and 3 (f), and includes three protrusions that protrude radially at 120 ° intervals. A sixth cutting blade 9A is formed at each end of the part 18.
A rake face 18a is formed on the face facing the rotation direction, and a flank 18b is formed on a convex curved face facing the rotation direction rearward. Further, an outer peripheral surface 2a in the rotation direction front of each rake face 18a.
Are respectively formed with fourth pockets 19b.

As shown in FIGS. 1, 2 and 3 (g), the seventh blade 10 has three protrusions 18 projecting radially from the outer peripheral surface 2a of the shaft 2 at 120 ° intervals. Has,
Tip 20 having a seventh cutting edge 10A at the tip of each projection 18
Are respectively attached by brazing or the like, and each seventh cutting edge 10
A rake face 18a is formed on a face facing the rotation direction of A, and a flank face 18b is formed on a convex curved face facing rearward in the rotation direction. Tip 20 made of a material harder than the material of shaft portion 2
By brazing, it is possible to form a groove in a harder work material. A flat or concave curved fifth pocket 19c is formed on the outer peripheral surface 2a of the shaft portion 2 located in front of the rake face 18a in the rotation direction. Finally, an eighth blade 11 is formed at an appropriate distance from the seventh blade 10 on the base end side of the shaft portion 2 in the longitudinal direction. The eighth blade portion 11 has the same configuration as the seventh blade portion 10 as shown in FIGS. 1, 2 and 3 (h), and includes three protrusions 18 projecting radially at 120 ° intervals. An eighth cutting edge 11A is formed at each end. Moreover, the eighth cutting blade 1
1A is out of phase by 60 ° in the circumferential direction with respect to the seventh cutting edge 10A, and a plane or the like facing the rotation direction connected to the eighth cutting edge 11A is a rake face 18a, and a convex curved surface facing rearward in the rotation direction is a rake face 18a. A flank 18b is provided. Each rake face 18a
A sixth pocket 19c is formed on each of the outer peripheral surfaces 2a in the front in the rotation direction.

The fifth, sixth, seventh and eighth cutting blades 8A,
9A, 10A and 11A are arranged at a phase difference of 60 ° from each other in the circumferential direction, and the fifth and seventh cutting edges 8A and 10A
Have the same phase, and the sixth and eighth cutting blades 9A and 11A have the same phase. An oil hole 22 is formed through the shaft 2 and the shank 3 so as to be coaxial with the axis O. This oil hole 22
Is branched radially outward from the axis O in the region of each of the blades 4 to 11, and is opened with openings 22a in pockets 15, 16, 19a to 19d located in front of the rake face of each cutting blade. Coolant can be discharged in the direction of the cutting blade. Also, the outer diameter of each of the cutting blades 4A to 11A does not need to be the same, and in the embodiment, the first cutting blade 4A
A has the maximum outer diameter, and the other cutting edges 5A are smaller.

The grooving cutter 1 according to the present embodiment has the above-described configuration. Next, a description will be given of a processing method thereof. As shown in FIGS. 5 and 6, the hydraulic conduit 30 is formed by, for example, extracting with a mold to form a prepared hole 30A having an inner diameter D, and using the grooved cutter 1 having a cutting edge outer diameter d smaller than D.
Groove processing inside. While the grooving cutter 1 is inserted into the prepared hole 30A and is eccentric, and one of the cutting blades 4A to 11A is brought into contact with the inner wall 31, the grooved cutter 1 is rotated around the axis O while being rotated. Is revolved along the inner wall 31 of the workpiece to perform the copying process. Thereby, the first to eighth blade portions 4 to 11
The first to eighth cutting blades 4A to 11A are intermittently sequentially
A plurality of (eight in the figure) grooves 31A to 31H can be simultaneously formed by cutting the inner wall 31 of 0A. At this time, each of the cutting edges 4A to 11A has a maximum width in the region of the cutting edges 4A to 11A at the tip, and the side surfaces 13c and 13d on the base side are gradually retracted inside along the rake faces 13a and 18a. Therefore, when the cutting blades 4A to 11A are cut into the grooves, the cutting can be performed smoothly.

Further, the first to fourth blades 4 to 7 are arranged with the cutting blades 4A to 7A arranged with a phase difference of 90 ° in the circumferential direction, and the fifth to eighth blades 8 to 11 are arranged circumferentially. Since the cutting edges 8A to 11A are arranged with a phase difference of 60 ° in each direction, the cutting of the inner wall 30a at the same time is suppressed, and the cutting and the cutting resistance at the time of cutting can be suppressed and the cutting can be favorably performed.
Chatter vibration and cutting edge loss can be prevented. Also prepared hole 30A
When a bush or the like having a higher hardness than the material of the conduit 30 is fitted into a part of the
Rake face 11 of each projection 18
Cutting edge 10 of high hardness insert 20 brazed to 8a
If grooves are formed with the A and the eighth cutting edge 11A, the grooves can be formed simultaneously with other grooves. In addition, each of the blades 4 to 11 is composed of two to three cutting blades, and the number of blades is smaller than that of the conventional grooving cutter. Therefore, chips generated by the respective cutting blades 4A to 11A are pocketed from the rake face. It can be guided to the base end side via 15, 16, 19a to 19d and can be smoothly discharged to the outside of the prepared hole 30A.

As described above, according to the present embodiment, it is possible to simultaneously process a plurality of grooves while suppressing the impact and cutting resistance during cutting, to suppress chatter vibration and chipping defects, and to improve chip discharge. It is. In addition, if the hardness of some of the cutting blades 10A and 11A is changed, even if a different kind of member having a different hardness is provided in a part of the pilot hole 30A, it can be processed simultaneously with other grooves.

In the above-described embodiment, eight blades are provided. However, the present invention is not limited to this.
An appropriate number of blades, such as a plurality of blades, may be arranged along the axis O. In the above-described cutter 1, the first to fourth blade portions 4 are provided.
The cutting blades 4A to 7A are arranged in a phase of 90 °, and the cutting edges 8A to 11A of the fifth to eighth blade portions 8 to 11 are arranged in a phase of 60 °. However, the present invention is not limited to this. Processing cutter 1
May be arranged with the same phase difference to form an equally divided cutting blade. With such a configuration, the manufacture of the grooved cutter 1 is easy. Alternatively, all the blade portions may be arranged with different phase differences to form an improperly divided cutting blade. With such a configuration, it is possible to prevent the shock at the time of the cutting process from resonating, and it is possible to more effectively prevent chatter vibration. The number of cutting blades provided on one blade is two or three.
The number is not limited to one, and may be one or four or more.
Further, assuming that a plurality of cutting blades are arranged on one blade, they need not be arranged at regular angular intervals. The arrangement of equally divided cutting blades becomes easy.

[0017]

According to the grooving cutter of the present invention, a plurality of grooves can be formed at the same time, and since the phases of a plurality of blade portions are shifted during the cutting, the simultaneous cutting can be suppressed. Since the impact during cutting can be reduced and cutting resistance can be suppressed, chatter vibration and loss of the cutting edge can be suppressed, groove processing accuracy is high, efficient groove processing is performed, and the life of the cutting blade is improved.

[Brief description of the drawings]

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

FIG. 2 shows a groove machining cutter shown in FIG.
FIG.

3A and 3B are cross-sectional views of a blade portion of the groove processing cutter shown in FIG. 2, wherein FIG. 3A is a first blade portion along a line AA, and FIG. 3B is a second blade portion along a line BB. , (C) is a third blade section along the line CC, (d) is a fourth blade section along the line DD,
(E) is the fifth blade portion in the cross section taken along line EE, (f) is FF
(G) shows the seventh blade part by the GG line cross section, and (h) shows the eighth blade part by the HH line cross section.

FIG. 4 is a cutaway perspective view of a blade portion of the groove processing cutter;
(A) is a first blade portion, (b) is a second blade portion, (c) is a third blade portion, (d) is a fourth blade portion, (e) is a fifth blade portion, and (f) is a fifth blade portion. Six blades, (g) shows a seventh blade, and (h) shows an eighth blade.

FIG. 5 is a front view showing a state where the inner wall of the hydraulic pipeline is machined by the groove machining cutter.

FIG. 6 is a longitudinal sectional view showing a state where the inner wall of the hydraulic pipeline is machined by the groove machining cutter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Groove processing cutter, 2 ... Shaft part, 4 ... First blade part, 4A ... First blade, 5 ... Second blade part, 5A ... Second cutting blade, 6 ... Third one blade part, 6A ... 3 cutting blades, 7: fourth cutting edge, 7A: fourth cutting blade,
8: Fifth blade, 8A: Fifth cutting blade, 9: Sixth blade, 9A ...
Sixth cutting blade, 10 ... Seventh blade part, 10A ... Seventh cutting blade, 11 ...
Eighth blade, 11A... Eighth blade.

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[Procedure amendment]

[Submission Date] March 14, 2000 (200.3.1)
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

A grooving cutter according to the present invention has a plurality of blades projecting at intervals along an axial direction of a tool body rotatable around an axis, and each blade has a cutting blade. the provided switching the rotation direction ahead of the cutting face of Rutotomoni cutting edge
A pocket for discharging waste is provided on the outer peripheral surface of the tool body.
Provided the cutting edge of said plurality of blade portions is characterized in that arranged by shifting the phase in the circumferential direction about the axis. Inserting the tool body into the prepared hole of the work material, rotating the tool body while revolving along the prepared hole and the inner wall of the pipe line, and cutting the cutting body provided on the multiple blades of the tool body However, multiple grooves can be formed at the same time by intermittently cutting the inner wall, and because the phases of the multiple blades are shifted, the cutting blades of the multiple blades bite in time and High precision and efficient grooving by suppressing vibrations and chipping of cutting edges by reducing impact during cutting and reducing cutting resistance by suppressing cutting work material The cutting blade life is improved.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017]

Grooving cutter according to the present invention is a plurality of grooves can be formed at the same time, moreover during cutting is suppressed to be machined at the same time to have shifted a plurality of blade portions of the phase during cutting Since the impact of the cutting is reduced and the cutting resistance can be suppressed, chatter vibration and loss of the cutting edge can be suppressed, the processing accuracy of the groove is high, the groove can be efficiently processed, and the life of the cutting edge is improved.

Claims (1)

[Claims] A plurality of blades protrude at intervals along an axial direction of a tool body rotatable around an axis, and each blade has a cutting edge, and the plurality of blades have an axis. A grooving cutter, which is arranged so as to be out of phase in the circumferential direction.