JP2000042820A - Aluminum-made cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight, to facilitate handling and storage, and to improve strength and abrasion resistance of the tool main body surface by covering the surface of an aluminum-made tool main body with a nickel phosphorus alloy. SOLUTION: A material of a tool main body 2 is aluminum, and in the surface, a covering layer 18 of a nickel phosphorus alloy covers a recessed groove 4 before installing a cartridge 5 by chemical plating, but a screw hole of an adjusting bolt and the bolt hole 12 inside of a fastening bolt 6 are not covered. The covering layer 18 has an almost constant thickness (10 to 50 μm). The tool main body 2 has an advantage of being lightweight, but is small in strength, hardness and abrasion resistance, and in a state of being not covered with the covering layer 18, a flaw and a defect are easily caused on the surface of a tool main body 2 when chips rub and pass at cutting work time, but since the surface of the tool main body 2 is covered with the covering layer 18 of a nickel phosphorus alloy, strength and abrasion resistance of the surface of the tool main body 2 are remarkably improved, so that a flaw and a defect are not caused even if the chips rub the tool main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cutting tool such as a rolling tool and a turning tool.

[0002]

2. Description of the Related Art Generally, a rolling tool such as a throw-away type face mill is made of steel or the like and has a large weight. When the indexable insert is mounted on this tool body and rotary cutting is performed, rotational runout is likely to occur if the center of gravity of the tool body is displaced from the center of rotation. A disadvantage arises in that the machining accuracy of the cut material is reduced. In addition to the turning tools, the tool bodies of the cutting tools, including turning tools such as cutting tools and boring bars, have a large weight, which is inconvenient for handling and storage.

[0003] In view of such problems, an object of the present invention is to provide an aluminum cutting tool provided with a tool body that is lightweight, has high strength, and has high wear resistance.

[0004]

An aluminum cutting tool according to the present invention is characterized in that the surface of an aluminum tool body is coated with a nickel phosphorus alloy. The tool body made of aluminum is lightweight, easy to handle and store, but has low strength and wear resistance due to its soft material. Therefore, if it is used for cutting as it is, the surface of the tool main body is rubbed by the chips generated by the cutting blade, and scratches and breakage are likely to occur. In the present invention, since the surface of the tool body made of aluminum is further coated with a nickel phosphorus alloy, the strength and wear resistance of the surface of the tool body are improved. Does not occur.

The nickel-phosphorus alloy is deposited by chemical plating in which a tool main body is immersed in a plating solution containing hypophosphite anions and nickel cations using a Group 8 metal as a catalyst to form a coating layer. It may be formed. In addition, if the aluminum cutting tool is a tool body of a rolling tool, since it is lightweight, it does not easily cause rotational runout during rotary cutting, thereby improving the processing accuracy of the work material by the cutting blade.

[0006]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is a perspective view of the front milling machine according to the embodiment as viewed from the front end, FIG. 2 is a central vertical cross-sectional view of the tool body of the front milling machine, and FIG. FIG. 4 is a cross-sectional view of the bolt hole portion of the concave groove of the tool body, showing the cartridge of the face mill and the fastening bolt disassembled, and FIG. FIG. 6 is a cross-sectional view showing a bolt hole. FIGS. 1 to 3 show a face mill according to an embodiment. A tool body 2 of a face mill 1 shown in the drawings has a substantially cylindrical shape, and a front end of an outer peripheral surface 3 of the tool body 2 is provided at a predetermined interval. Multiple grooves 4
Are formed, and a detachable cartridge 5 is
Is fixed in the concave groove 4 with the fastening bolt 6. A throw-away tip (hereinafter, sometimes simply referred to as a tip) 8 is seated on a recessed tip mounting seat 7 provided at the tip of the cartridge 5 and is fixed with screws 9. A recess 10 having a through hole is formed at the base end side of the chip 8 of the cartridge 5, a fastening bolt 6 is inserted through the through hole of the recess 10, and a bolt formed on the bottom surface 4 a of the recess groove 4 of the tool body 2. The head of the fastening bolt 6 is screwed into the hole 12 and seats in the recess 10.

A screw hole 13 is formed in the end face 4b on the base end side of the concave groove 4 of the tool body 2 along the rotation axis O of the tool body 2, and an adjusting bolt 15 screwed into the screw hole 13 is formed. The head 15 a projects into the groove 4 and is brought into contact with the base end surface 5 a of the cartridge 5. Head 15 of adjustment bolt 15
“a” has a substantially cylindrical shape, and a wrench hole 16 for inserting a wrench or the like is formed on the outer peripheral surface thereof. Tool body 2
The front cutting edge 8a of the tip 8 protrudes from the front end side of the tool main body 2 in a state where the cartridge 5 is fixed with the fastening bolt 6 with the tip 8 facing the front end outer side in the concave groove 4 of FIG. It protrudes from the outer peripheral surface 3 of the tool body 2 to the outer peripheral side. Moreover, the wrench hole 1 in the head 15a of the adjustment bolt 15
6 by inserting a wrench or the like into the screw hole 13
The adjustment bolt 15 can be advanced and retracted by a small amount with respect to the head 15a.
By pressing the base end surface 5a of the cartridge 5 with, the amount of protrusion of the front cutting blade 8a of the chip 8 can be adjusted by a small amount.

The material of the tool body 2 is aluminum. In addition, as shown in FIG. 4, a coating layer 18 formed of a nickel-phosphorus alloy is formed on the entire surface of the tool body 2 by chemical plating. The coating layer 18 covers the groove 4 before mounting the cartridge 5, but does not cover the inside of the screw hole 13 of the adjustment bolt 13 and the inside of the bolt hole 12 of the fastening bolt 6. The coating layer 18 has a substantially constant thickness and is in a range of 10 μm to 50 μm. The tool body 2 made of aluminum has an advantage that it is lighter than steel, which is a material of a conventional tool body, but has a lower strength, hardness, and abrasion resistance. For this reason, when not covered with the coating layer 18, there is a disadvantage that chips are rubbed at the time of cutting, and the surface of the tool body 2 is easily scratched or chipped. In this regard, in the present embodiment, the surface of the tool main body 2 is coated with the nickel-phosphorus alloy coating layer 18 by chemical plating, so that the strength and wear resistance of the surface of the tool main body 2 are significantly improved. Even if it is rubbed, no scratches or defects occur.

Next, a method of manufacturing the coating layer 18 of the tool body 2 according to the present embodiment will be described. A plating solution containing an anion of hypophosphorous acid H ₂ PO ₂ and a nickel cation is put in a plating tank (not shown), and a Group VIII metal such as iron, cobalt, or nickel is used as a catalyst. The tool main body 2 is made of aluminum and is used before the cartridge 5 is mounted. The bolt holes 12 and the screw holes 13 are provided with a fastening bolt jig provided with a male screw portion having the same diameter as the fastening bolt 6 and the adjusting bolt 15 respectively. Screw the adjusting bolt jig. This tool body 2 is degreased with trichlorene as a pretreatment step, and further subjected to alkali degreasing, pickling, and electric field degreasing.
The surface is fully activated. Next, as a plating process,
The tool main body 2 is immersed in a plating bath, and a nickel-phosphorous alloy is deposited on the surface of the tool main body 2 in a stirring plating solution to form a coating layer 18.

This chemical plating reaction is performed as follows. First, the hypophosphite anion in the plating solution causes the following dehydrogenation decomposition using the group VIII metal as a catalyst. [H ₂ PO ₂ ] ^- + H ₂ O → H [HPO ₃ ] ^- + 2H The generated hydrogen atoms are adsorbed on the surface of the tool body 2 (in the form of a so-called condensed layer) and activated. Upon contact with the ions, nickel is reduced to metal and deposited on the surface of the aluminum tool body 2 as follows. ^{Ni ++ + 2H → Ni ° +} 2H - also activated hydrogen atoms on the surface of the tool body 2 by reducing phosphorus make nickel and alloys react with hypophosphorous anion in the liquid. [H ₂ PO ₂ ] ⁻ + H → P ° + OH ⁻ + H ₂ O The coating layer 18 is formed on the surface of the tool body 2 by the nickel phosphorus alloy plating. Further, the nickel thus precipitated serves as a catalyst, and the above-described nickel reduction plating reaction proceeds continuously.

In this manner, the coating layer 18 of the nickel-phosphorus alloy is formed on the entire surface of the tool body 2, and at this time, the bolt holes 12 (and the screw holes 13) are tightened as shown in FIG. Since the tool 6A is screwed, the internal female screw portion is not plated. And fastening bolt jig 6
A may be removed from the bolt hole 12. As for the screw hole 13 of the adjustment bolt 15, an adjustment bolt jig (not shown) may be removed. In this way, the tool body 2 having the coating layer 18 plated with a nickel-phosphorus alloy over the entire surface is obtained. The coating layer 18 formed by the chemical plating has an effect of having a uniform thickness and fewer pinholes as compared with electroless plating or electroplating using a metal other than Group 8 metals. Then, the cartridge 5 is mounted on each of the grooves 4 of the tool body 2 covered with the coating layer 18, and the fastening bolt 6 is screwed into the bolt hole 12 through the through hole of the recess 10, and the screw hole 13 is formed.
Then, the adjustment bolt 15 may be screwed. The protrusion of the front cutting edge 8a of the tip 8 can be adjusted by operating the adjustment bolt 15.

As described above, according to the present embodiment, since the tool body 2 is made of aluminum, it is lightweight and easy to handle and store. Even if the cartridge 5 is mounted and high-speed rotation cutting is performed, the center of gravity is maintained. It is possible to suppress the occurrence of rotational runout due to the displacement, and to perform high-precision cutting. Moreover,
Since the surface of the tool body 2 made of aluminum is covered with the nickel-phosphorus alloy coating layer 18 by chemical plating, the strength and wear resistance of the surface of the tool body 2 made of aluminum are remarkably improved. Even if it is rubbed, no scratches or defects occur.

In the above-described embodiment, the face mill 1 has been described as a milling tool. However, the present invention is not limited to this, and other milling tools such as an end mill and a drill, a cutting tool, It can be applied to various cutting tools such as turning tools such as boring bars. Note that the coating layer 18 of the present invention may be formed by electroless plating or electroplating with a metal other than Group 8 metals.

[0014]

As described above, in the cutting tool according to the present invention, the surface of the tool body made of aluminum is coated with a nickel-phosphorus alloy, so that the tool body is made of aluminum and is lighter than conventional steel. There is an effect that handling and storage are easy. In addition, the tool body made of aluminum is made of a soft material and has low strength and wear resistance. However, since it is coated with a nickel phosphorus alloy, the strength and wear resistance of the tool body surface are improved, and even if chips are rubbed, the tool body surface No scratches or defects occur.

[Brief description of the drawings]

FIG. 1 is a perspective view of a front milling machine according to an embodiment of the present invention as viewed from a front end side.

FIG. 2 is a central longitudinal sectional view of the face mill shown in FIG. 1;

FIG. 3 is a front end view of a part of the cartridge of the front milling machine shown in FIG. 1;

FIG. 4 is a sectional view of a concave groove showing the cartridge and the fastening bolt of the tool body in an exploded state.

FIG. 5 is a sectional view showing a fastening bolt jig and a bolt hole in a plated state of the tool body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Face milling 2 Tool body 18 Coating layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidehiko Nagaya 1511 Furamaki, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (72) Inventor Hiroaki Hayashizaki 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (72) Inventor Atsushi Oki 1511 Komagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works F-term (reference) 3C022 FF05 QQ03 QQ04 3C037 CC01 CC04 CC08 FF04 FF06

Claims (1)

[Claims] 1. An aluminum cutting tool in which the surface of an aluminum tool body is coated with a nickel phosphorus alloy.