JPS5931584B2 - Cemented carbide for glass cutting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cemented carbide that is inexpensive, has excellent cutting properties, and is particularly suitable for use in cutting glass.

Conventionally, diamond tools have been used to cut glass, which are made by forming diamond grains into a pentagonal pyramid with a sharp cutting edge, which is fixed to a metal rod or the like.

However, as is well known, diamond tools are expensive, so the field of use for them is severely limited.

Therefore, an inexpensive glass cutting tool that uses tool steel instead of diamond has been proposed and is used in some cases, but as mentioned above, the cutting edge of this tool is made of tool steel. However, there is a problem that the cutting edge wear is significant and the glass cutting properties are significantly inferior to diamond.

From the above-mentioned point of view, the present inventors aimed to obtain a material suitable for cutting glass at a low cost, in particular titanium carbide (hereinafter referred to as TIC) - titanium nitride, which has been conventionally used for cutting steel materials, etc. (hereinafter referred to as TiN) base hard alloy,
That is, it contains one or more iron group metals as a binder phase forming component, and the rest is substantially TiC and Ti.
As a result of research focusing on cemented carbide made of N (hereinafter referred to as conventional Tic-TiN based cemented carbide), it was found that
CTiN-based super-base hard alloy hard phase forming components include tungsten carbide (hereinafter referred to as WC), molybdenum carbide (hereinafter referred to as MO2C), and tantalum carbide (hereinafter referred to as TaC).
, niobium carbide (hereinafter referred to as NbC), and vanadium carbide (hereinafter referred to as VC). 30% by weight, and further TiC Ti
Content ratio to C+ T i N is 55/1.00
90/l 00, that is, 0.55 to 0.90, and the average particle size of the hard phase forming component to 0.3 to 3.
They found that when the diameter is 0 μm, the glass cutting properties are even better than that of diamond.

Therefore, this invention was made based on the above findings, and includes WC, MO2C, and TaC as hard phase forming components.

One or more of NbC and VC: 10
~300~30% by weight of one or two of the iron group metals as a forming component
More than species: 5 to 30% by weight, also TiN+TiC as hard phase forming components.

and inevitable impurities: 65-855-85% by weight, and Tic/TiN+TiC=55/100-90/1
The cemented carbide has a composition satisfying 0.00 and the average particle size of the hard phase-forming component is 0.3 to 3.0 μm, and is characterized by excellent glass cutting properties. This new application has been discovered for the TiC-TiN-based super-base hard alloy, which has been used as a cutting tool for metals such as metals and castings.

Next, the reason why the composition range and average grain size of the cemented carbide of the present invention are limited as described above will be explained.

(a) If the content of iron group metal as a component forming the iron group metal bonding phase is less than 5%, it will not be possible to ensure the toughness essential for cutting glass, and as a result, chipping will easily occur on the cutting edge when cutting glass. Therefore, it is necessary to contain 5% or more, but 30
If the content exceeds 7%, the hard phase forming component will be relatively
The content should not exceed 30, because if it becomes too low (below 0), the wear resistance will deteriorate significantly.

(b) WC, Mo2C, TaC, NbC, and V have homogeneous phases that improve sinterability, improve toughness, and significantly increase edge strength when used as a glass cutting tool. There is a residual effect, but if its content is less than 10%, the desired effect cannot be obtained, while if it is contained in more than 30%, T i N + T
The content of iC becomes relatively too small and TiN+
Since it becomes impossible to secure the excellent wear resistance provided by TiC, the content should be reduced to 10-3
It was set as 0%.

(c) TiN+TiC If the total amount of TiN and TiC is less than 65%, it will not be possible to secure the excellent wear resistance required for glass cutting, while if it is contained in more than 85%, the hard phase forming components will be reduced. If the total amount becomes too large, exceeding 95%, and inversely proportional to this, the content of the binder phase-forming components becomes too small, less than 5%, resulting in a decrease in toughness. The amount was determined to be 65-85%.

(d) Content ratio of TiC to TiN+TiC Generally, at room temperature, TiC has a hardness of 3200 K9/m
m v TiN has a hardness of 1950 to 7m4, so TiC has a higher hardness than TiN, but if the ratio is less than 55/100, TiC and T
Regarding the relative ratio of iN, the content of TiN increases beyond 45%, and conversely, the content of TiC, which has higher hardness, increases to 5%.
If the ratio is less than 5%, the wear resistance provided by Tic will be impaired, while if the ratio exceeds 907100, the relative content of TiC, which has high hardness, will exceed 90%. Although the relative content of TiN is 10%, the relative content of TiN is
%, the toughness provided by TiN will deteriorate, so the ratio is set to 55/100.
~90/100.

(e) Average particle size of hard phase-forming components In general, the smaller the particle size of the hard phase-forming components, the higher the distribution concentration of the hard phase, and the toughness of the alloy decreases accordingly.

Therefore, if the average particle size is less than 0.3 μm, the distribution concentration of the hard phase becomes too high, making it difficult to ensure the excellent toughness required for glass cutting.

On the other hand, as the particle size of the hard phase increases, the distribution concentration of the hard phase decreases, and the wear resistance of the alloy decreases accordingly.

Therefore, if the average particle size exceeds 3.0 μm, it is also impossible to ensure excellent wear resistance, which is essential for cutting glass.

In this way, in order to ensure excellent glass cutting properties, it is essential to have both excellent toughness and wear resistance, and for this reason, the average particle size of the hard phase forming component was set to 0.3. It was determined to be ~3.0 μm.

Next, the cemented carbide of the present invention will be explained with reference to Examples.

Various powders having the composition and average particle size shown in Table 1 are prepared as starting raw material powders, and after blending these raw material powders to have the final component composition shown in Table 2, they are mixed in a ball mill. Grinding and grinding for 48 hours using a carbide ball
Mix, dry, and then add the resulting mixed powder to 1
The cemented carbide of the present invention is pressed into a predetermined shape at a unit pressure of 5 Ky/rmA, then sintered by holding it at a temperature of 1400°C for 1 hour in a vacuum atmosphere, and then ground into a predetermined shape. Alloy cutting blades 1 to 3 (hereinafter referred to as cutting blades 1 to 3 of the present invention)
3) and a comparative cemented carbide cutting blade l.

2 (hereinafter referred to as comparative cutting blade 1.2c!) were manufactured.

Comparative cutting blade 1 has a composition that corresponds to TiC-TiN-based super-based hard alloy, which has been conventionally used as a cutting blade for cutting steel materials, etc. Comparative cutting blade 2 It corresponds to the invention cemented carbide, that is, it has substantially the same composition as the cutting blade 3 of the invention, but the average particle size of the hard phase forming component is larger than the range of the invention.

Next, the average particle diameter, transverse rupture strength, and Rockwell hardness A scale of the hard phase forming components of the cutting blades 1 to 3 of the present invention and comparative cutting blades 1 and 2 obtained as a result were measured. The cutting blade was attached to a continuous glass cutting machine and used to cut a soda lime glass plate, and its cutting life time was measured.

These measurement results are also shown in Table 2. A glass cutting test was also conducted on a conventional diamond cutting blade (hereinafter referred to as the conventional cutting blade) under the same conditions.

As shown in Table 2, the comparative cutting blades have the same chemical composition as TiN-based super-based hard alloys, which have been conventionally used for cutting steel materials, etc.

Although the average particle size of the hard phase was 2.0 μm, which is within the range of the present invention, the cutting blade exhibited a short cutting life of only 5 hours, and furthermore, it had substantially the same composition as the cutting blade 3 of the present invention. However, comparative cutting blade 2, in which only the average particle size of the hard phase was 3.5 μm, which was outside the range of the present invention, had a service life of only 1 hour.

In addition, since the conventional cutting blade was made of diamond, it exhibited a cutting life of 10 hours, which was superior to the cutting blades 1 and 2 described above.

On the other hand, the cutting blade of the present invention has 4 to 5 of the comparative cutting blade 1.
, 4 times longer, and 2.0 to 2.7 times longer than conventional cutting blades, and it is clear that the cutting blade has excellent cutting characteristics.

From these results, cemented carbide whose component composition and average particle size of hard phase-forming components are within the range of the present invention has excellent toughness and wear resistance, and therefore is excellent when used for cutting glass. It is clear that the material exhibits excellent cutting properties.

As mentioned above, the cemented carbide of the present invention not only has extremely excellent glass cutting properties, but also uses inexpensive TiC powder and TiN powder as the main raw materials. It has extremely excellent properties such as being able to be manufactured into the optimal rectangular shape for cutting, and by controlling the component composition and particle size, it can be easily made into the optimal shape for the various glass materials to be cut. It has.

Claims (1)

[Claims] 1. One or more of tungsten carbide, molybdenum carbide, tantalum carbide, niobium carbide, and vanadium carbide as a hard phase forming component: 10 to 30%, iron as a binder phase forming component One or two of the group metals
Species: 5 to 30%, consisting of titanium nitride and titanium carbide as hard phase forming components, and inevitable impurities: 65 to 85% (or more by weight), and titanium carbide relative to the total content of titanium nitride and titanium carbide. The content ratio is 55/100 to 90/1.
A cemented carbide for glass cutting, characterized in that the hard phase forming component has an average particle size of 0.3 to 3.0 μm.