JPS5927381B2 - Carbide throw-away tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbide throw-away tip whose cutting edge can be distinguished by color to indicate whether it is used or not.

Conventionally, carbide throw-away tips for cutting made of hard sintered alloys have been known.Furthermore, the surface of the carbide throw-away tips is coated with, for example, titanium nitride, titanium carbonitride, titanium carbonitride, etc.
Also known is a technique of coating titanium carbonitride with a thickness of 1 to 201 tm to improve wear resistance and extend cutting life.

In addition, the coating layer of the above-mentioned carbide throw-away chip, if it is made of titanium nitride, titanium carbonitride, or tinonitoxide carbonitride, exhibits a beautiful but dark yellow to red color, and furthermore, even after cutting, it has a clear color. It is also well known that no discoloration occurs.

For this reason, it is necessary to reliably identify which of the plurality of cutting edges in the carbide indexable tip are used and which ones are not.
It is almost impossible to change the cutting blade in a short time inside a machine tool with insufficient lighting.Therefore, when we collected used chips and examined them, we found that approximately 20% of the cutting blades were It became clear that it was unused.

From the above-mentioned viewpoint, the present inventors aimed to distinguish between used cutting edges and unused cutting edges by forming a coating layer on the carbide indexable tip, in particular (1) before and after use. Great discoloration afterwards.

(2) It has a bright and beautiful color tone before use.

(3) Has antirust effect. (4) There is no significant discoloration of the apparent soil due to oil, especially cutting oil.

(5) Does not adversely affect chip properties (wear resistance, toughness, etc.).

(6) Low cost.

As a result of research to find a coating layer that satisfies the following conditions, we found that TiCxNy02 (0.05<X<0.3
, Z<0.3, X+Y+Z<1.0) and has a thickness of 0.01 to 0.5 μm.

That is, a part of or the vicinity of the cutting edge of the carbide indexable tip, or the entire cutting edge is coated with TiCxNyOz with a thickness of 0.01 to 0.5 μm (however, 0.05×<0.3
,Z〈0.3,X+Y+Z〉1.0) layer,
The coated part has a bright and beautiful yellow-orange color before use, has improved corrosion resistance, does not rust during storage, and has a large appearance even if contaminated by cutting oil. On the other hand, after use, the color changes to black due to the high temperatures generated during cutting, and as a result, the bright yellow-orange color of an unused cutting edge and the black color of a used cutting edge can be seen in a dark place. We have obtained the knowledge that it is extremely easy to make a stand Σu.

This invention has been made based on the above findings, and the reason why the composition and thickness of the coating layer are limited as described above will be explained below.

(a) Composition of coating layer Titanium carbonitride, that is, TiCxN
, Y, hexagram and z are determined empirically.
When the relative ratio of +Z x 1.0 is satisfied, it has a yellow-orange color, and when this yellow-orange color is exposed to high temperatures during cutting, it changes to black, which is easily distinguishable by color.

That is, X, Y, hexagram, and Z that are out of the above relative proportions
With this value, it does not have a yellow-orange color and does not change color to black, which allows easy color differentiation, even when exposed to high temperatures. (b
) Thickness of the coating layer If the thickness is less than 0.01 μm, a clear black discoloration that can be easily distinguished by color cannot be observed;
If the thickness exceeds 5 μm, not only will it become translucent and it will not be possible to obtain a bright yellow-orange color tone that reflects the skin of the chip, but the wear resistance of the chip will improve, but the toughness will be significantly reduced. Therefore, the thickness is 0.01-{). It was determined to be 5 μm.

The thickness is preferably 0.02 to 0.1 μm. Furthermore, the coating layer on the carbide throw-away chip of the present invention can, in principle, be formed at a very low cost using an ordinary coating device that applies plasma chemical vapor deposition and sputtering. , when forming the coating layer, the temperature as the formation condition was set to 7.
It is necessary to keep the temperature below 00℃.

This is because when the temperature exceeds 700°C, the mass transfer coefficient in the chip base material increases, and the surface portion of the chip changes in quality during the formation of the coating layer, resulting in a transverse rupture strength of 5 (fl) or more. This is based on the reason that it is becoming more common to experience a decline. Next, the carbide throw-away lug of the present invention will be explained with reference to examples. First, J.I.
100 cemented carbide throw-away chips made of SP2O cemented carbide with a dark silver-gray surface color were prepared, and these W5O chips were placed in a normal sputtering device under conditions of a temperature of 400°C and a pressure of 104 Torr. In Ar:N2:CH
30 while flowing gas mixed at the ratio of 4=5:4:1.
A carbide indexable chip of the present invention was produced by subjecting the chip to a sputtering treatment for 1 minute, in which the entire chip was covered with a coating layer that was translucent and had a bright yellow-orange color.

The coating layer of the carbide throwaway tube VC of the present invention has a composition: TiCO. O8 NO. 9OO. Ol, thickness 0
．． It had a diameter of 0.05 μm. Next, using 50 pieces of the above-mentioned carbide throw-away tips of the present invention and 50 pieces of the above-mentioned conventional carbide throw-away tips without a coating layer, cutting was performed according to various cutting conditions shown in Table 1. A test was conducted to measure the life time until the blank wear reached 0.4wf1C, and to observe the color change of the worn part after the cutting blade was used.

The life time measurement results and color change observation results are shown in Table 1. As is clear from the results shown in Table 1, if the cutting conditions are the same, the carbide throw-away tips of the present invention and the conventional carbide throw-away tips have almost the same life time, which indicates that the use of the cutting edge - This shows that the chip performance is not impaired in any way by the unused coating layer provided for color separation.

In addition, the carbide throw-away tip of the present invention has a translucent bright yellow-orange color that changes to black after use, making it easy to distinguish before and after use. In contrast, conventional carbide indexable inserts only change color from a dark silver-gray color to a slightly reddish color, which is particularly important for short periods of time inside machine tools with poor lighting. It is almost impossible to do otherwise.

As mentioned above, the carbide throw-away chip VC. of the present invention has an ultra-thin coating layer formed at a low cost by applying a low temperature of 700° C. or less by ordinary plasma chemical vapor deposition method and sputtering method. In particular, the translucent, bright yellow-orange color of the cutting blade before use turns black after use, so even if the inside of the machine tool is poorly lit, it will be difficult to see whether the cutting blade is used or not. Since color classification can be done clearly and easily, there is no longer any chance of missing unused cutting edges, which was around 20% until now.

Claims (1)

[Claims] 1 Thickness 0.01 to 0.5 on a part of or near the cutting edge, or on the entire cutting edge to distinguish whether the cutting edge is used or not.
Yellow-orange TiCxNyOz with μm (however, 0.0
5<X<0.3, Z<0.3, X+Y+Z<1.0) A carbide throw-away chip characterized by being coated with a layer.