JP2513657Y2 - Hard layer composite coated end mill - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard layer composite coated end mill having a longer service life and excellent finishing accuracy than ever before.

[0002]

2. Description of the Related Art Generally, end mills are made of high speed steel or WC.
There is also known a hard-layer-coated end mill that is manufactured from a base cemented carbide, and that further uses the above-mentioned end mill as a substrate and coats the surface thereof with a hard layer of titanium nitride (hereinafter referred to as TiN).

Further, in the end mill during cutting, rubbing wear (wear corresponding to flank wear of the cutting tip) occurs in both the margin part and the cutting edge part, while chip discharge occurs in the flute part. It is also known that wear accompanied by heat (wear equivalent to wear on the rake face of the cutting tip) occurs.

[0004]

By coating the above-mentioned Tin hard layer, the wear resistance has been remarkably improved and the service life has been extended as compared with the conventional end mills, but the precision of machining and the improvement of efficiency have been achieved. Along with this, there has been a demand for hard layer-coated end mills that are more excellent in wear resistance and have good finished surface accuracy.

[0005]

[Means for Solving the Problems] Therefore, the present inventors
As a result of research to obtain an end mill having a longer life and excellent finishing surface accuracy in order to meet such demands, the conventional T
In the iN hard layer-coated end mill, since the TiN hard layer is a coating layer that is weak against rubbing wear, rubbing wear is likely to occur in the margin portion and the cutting edge portion, and if such rubbing wear occurs, the dimensional accuracy of the processing decreases, so A composite nitride of titanium and aluminum (hereinafter referred to as (Ti, Al) N), which is more resistant to rubbing wear than TiN, in the margin portion and the cutting edge portion,
One of a composite carbide {hereinafter referred to as (Ti, Al) C} and a composite carbonitride {hereinafter referred to as (Ti, Al) CN}, or a plurality of two or more kinds thereof are coated, The flute part is resistant to wear accompanied by heat due to chip discharge T
The end mill formed by coating the iN hard layer is the conventional TiN
We have obtained the knowledge that the service life is extended and the finished surface accuracy is superior to that of an end mill that covers the entire hard layer.

The present invention has been made on the basis of such knowledge, and the (Ti, Al) N hard layer, the (Ti, Al) C hard layer and the (Ti, Al) hard layer are provided in the margin portion and the cutting edge portion of the end mill. Any one of CN hard layers is coated with a single layer or two or more types of multilayers, and the flute portion is provided with a T layer.
It is characterized by a hard layer composite coated end mill formed by coating an iN hard layer.

The hard layer composite coated end mill of the present invention will be described in more detail with reference to FIG.

FIG. 1 is a plan view of a hard layer composite coated end mill according to the present invention. (Ti, Al) N, (Ti, Al) C, (Ti, Al) is provided in a margin portion 1 and a cutting edge portion 2.
It is shown that the composite compound hard layer 4 made of one or more kinds of CN is coated, and the flute portion 3 is coated with the TiN hard layer 5. It is preferable that the shank portion 6 is not covered with any hard layer.

FIG. 2 is a sectional view taken along line II-II of FIG.
In the margin part 1, Ti, Al) N, (Ti, Al) C,
It is shown that the composite compound hard layer 4 made of one or more of (Ti, Al) CN is coated on the flute portion 3 with the TiN hard layer 5.

At the flute portion 3, wear accompanied by heat is generated during cutting of the end mill, and welding of chips occurs,
If these phenomena occur, the accuracy of the cutting surface will decrease,
Since the TiN hard layer is the most resistant to such a phenomenon, the flute portion 3 of the end mill of the present invention is coated with the TiN hard layer 5 like the conventional hard layer-coated end mill.

[0011]

EXAMPLES The hard layer composite coated end mill of the present invention will be specifically described based on examples.

Outer diameter: A commercially available WC-based cemented carbide end mill having a size of 6 mm was prepared, and the shank portion 6, margin portion 1 and cutting edge portion 2 of this end mill were masked, and only the flute portion 3 had ordinary ions. The TiN hard layer 5 having a thickness of 3 μm is coated by the plating method, and then the shank portion 6 and the flute portion 3 are masked so that the margin portion 1 and the cutting edge portion 2 have a total thickness of 3 μm by the ion plating method. Like (Ti, Al) N hard layer, (Ti, Al) C hard layer and (Ti, Al) CN
A composite compound hard layer 4 in which a hard layer was coated in a single layer or multiple layers was formed to prepare hard layer composite-coated end mills A to G of the present invention.

On the other hand, a conventional hard layer-coated end mill was prepared by coating the commercially available WC-based cemented carbide end mill with a TiN hard layer having a film thickness of 3 μm on the entire surface excluding the shank portion. All of the WC-based cemented carbide end mills have a film thickness of 3 μm (Ti, Al) N hard layer, (Ti, Al) C hard layer or (Ti, Al) CN.
Comparative hard layer-coated end mills a to c were prepared in which the hard layer was entirely coated except for the shank portion.

These end mills were cut under the following conditions: Work material: S43C, Cutting speed: 60 m / min., Feed per blade: 0.01 mm / blade, Depth direction cut: 15 mm, Cut width: 0.05 mm Wet one-sided cutting test of steel by down-cut method, wear of margin part (hereinafter referred to as V _B max)
Is 0.2 mm or more, or the surface roughness of the vertical surface of the work material (hereinafter referred to as R max) is 3.0 μm or more is defined as the life, and the time to reach this life is measured in units of 5 minutes. The measurement results are shown in Table 1.

[0015]

[Table 1]

From the results shown in Table 1, all of the hard layer composite coated end mills A to G of the present invention have V _{B at the} margin portion.
The time until the life reaches a maximum of 0.2 mm or more is significantly longer than that of the conventional hard layer-coated end mills, while the comparative hard layer-coated end mills a to c have roughness Rma of the vertical surface of the work material.
It can be seen that the time until x becomes 3.0 μm or more and the life is reached is significantly shorter than that of the hard layer composite coated end mills A to G of the present invention.

[0017]

The TiN hard layer and (Ti, Al) N, (Ti, Al) having different characteristics as in the present invention
By effectively combining the composite compound hard layers made of one or more of C and (Ti, Al) CN and performing the composite coating, it is possible to provide an end mill having a longer life than the conventional one and a good finished surface accuracy. Since it can contribute to cost reduction, it has excellent industrial effects.

[Brief description of drawings]

FIG. 1 is a plan view of a hard layer composite coated end mill of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 1 Margin part 2 Cutting edge part 3 Flute part 4 Composite compound hard layer 5 TiN hard layer 6 Shank part

Claims (1)

(57) [Scope of utility model registration request] 1. A composite nitride hard layer of titanium and aluminum, a composite carbide hard layer of titanium and aluminum, and a composite carbonitride hard layer of titanium and aluminum at the margin portion and cutting edge portion of the end mill. 1. A hard-layer composite-coated end mill, comprising a single layer or a multi-layer of two or more types and a flute portion coated with a titanium nitride hard layer.