JPH0763500A - Arrowhead - Google Patents

Abstract

PURPOSE:To obtain an arrowhead having excellent wear resistance, corrosion resistance, pitching resistance, a clear and beautiful mirror surface of a color tone and excellent decorativeness by providing the arrowhead made of a sintered compact having specific breakage resistance at an end of an arrow. CONSTITUTION:An arrowhead 1 is made of a sintered compact having a breakage strength of 80kg/mm<2> or more, and has a substantially columnar body having a protrusion 1a at its end. The arrowhead 1 is provided at an end of a shaft 2, and an arrow blade 3 and an arrow tube 4 are provided at a rear end of the shaft 2. The end of the arrowhead 1 is formed with a protrusion 1a to be easily pierced to a target, but may be formed in a curved state. As the material of the arrowhead 1, colored sintered compact such as gold sintered alloy, colored zirconia ceramics is used. The material is ground by an NC machine tool, and mirror finished to obtain the arrowhead 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrow head which constitutes an arrow of a Japanese bow or a western bow.

[0002]

2. Description of the Related Art As shown in FIG. 1, a Japanese bow arrow has an arrow blade 3 and an arrow blade 4 on the rear end side of a shaft 2 having an arrowhead 1 at the tip.
It is configured with. Then, the arrow thrown by the bow with the arrowhead 1 at the head is pierced by the arrowhead 1. The arrowhead 1 is made of iron or a copper alloy, and has a protruding portion 1 at its tip so that it is easily pierced.
a.

The arrow is used not only for archery competitions, but also for decoration as a kind of traditional craft.

Further, the arrow for a bow is basically the same structure as that for the Japanese bow.

[0005]

[Problems to be Solved by the Invention] However, the iron arrowhead 1
Has a problem that it cannot be used for a long period of time because it is easily rusted when left alone for a long time and is easily worn. Further, the copper alloy Yajiri 1 was less prone to rust, but was more worn and shorter in life than the iron one.

Further, in the case of a Japanese bow arrow used for decoration, there is a problem that the arrowhead 1 made of iron or copper alloy is poor in decorativeness.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, in which the arrowhead is formed of a sintered body such as ceramic or cermet. Moreover, since a large impact is applied to the arrow when hitting it, a sintered body having a bending strength of 80 kg / mm ² or more is used to prevent chipping or cracking.

Further, in order to provide decorativeness, a sintered body colored golden or other colors may be used. As such a sintered body, a gold-colored sintered alloy or colored zirconia ceramics can be used.

The gold-colored sintered alloy of the present invention comprises TiC and Ti.
It is a sintered body obtained by subjecting a molded body containing N as a main component to firing and then mirror-finishing. Generally, a sintered alloy containing Ti has high strength and an excellent color, but has a drawback that it is inferior in chipping resistance. Therefore, the present invention solves this problem by improving the material.

That is, in the golden sintered alloy of the present invention, Ti is 55 to 75% by weight, the iron group element and Group 6a element containing at least Cr are 3 to 29% by weight, and the balance is It is composed of a non-metal element, and the proportion of Cr in the metal elements other than Ti is 40% by weight or more. Here, the iron group elements include Ni and F
e, Co, and 6th element of the periodic table Cr, Mo,
There is W, and carbon (C) and nitrogen (N) are non-metallic elements.
There is.

The sintering of this sintered alloy is performed by hot pressing, HIP, etc. in addition to vacuum heating and sintering, and the bending strength is 100 kg / mm by setting the porosity of the sintered body to 5% or less.
It can be ² or more. The average grain size is 3 μm
By the following, the stress acting on each particle was reduced and the occurrence of shedding was suppressed.

With these ingenuity, not only the color tone,
It was possible to obtain a good gold-colored sintered alloy that was strong and had little chipping.

In the colored zirconia ceramics, ZrO ₂ which is the main component is added to Y ₂ O ₃ , CaO, MgO and C.
a stabilizer comprising at least one of eO ₂ and Fe,
It is a sintered body obtained by adding and mixing a colorant made of at least one kind of metal oxide such as Cr, Ni, Co, Mn, and shaping the obtained raw material into a predetermined shape and firing.

The amount of the above stabilizer is adjusted so that tetragonal zirconia crystals in the sintered body are contained in an amount of 50% or more, preferably 80% or more, and the average crystal grain size is 2 μm.
By using the partially stabilized zirconia ceramics having a diameter of m or less, preferably 1 μm or less, a sintered body having high strength and toughness can be obtained. In addition, various colors can be obtained by adjusting the type and amount of the colorant.

For applications such as competition arrows that do not require special decoration, white zirconia ceramics containing no colorant may be used.

[0016]

According to the present invention, by forming the arrowhead from a sintered body such as a gold-colored sintered alloy or colored zirconia ceramics, it is possible to obtain an arrowhead having excellent corrosion resistance and wear resistance and a beautiful appearance. it can.

[0017]

EXAMPLES Examples of the present invention will be described below.

As shown in FIGS. 1 and 2, the arrowhead 1 according to the present invention.
Consists of a sintered body having a bending strength of 80 kg / mm ² or more,
It is a substantially columnar body having a protruding portion 1a at the tip, and this arrowhead 1
Is provided at the tip of the shaft 2, and the arrow blades 3 and the blades 4 are provided at the rear end side of the shaft 2. Further, the tip end of the arrowhead 1 is formed with the protruding portion 1a so as to be easily pierced, but the tip may be curved as shown in FIG.

As the sintered body forming the arrowhead 1, a colored sintered body such as a gold-colored sintered alloy or colored zirconia ceramics is used. An example of the gold-colored sintered alloy will be described in detail below.

First, TiN and TiCN having a grain size of 0.5 to 3.0 μm as Ti nitride and carbonitride, and Ni and Co having a grain size of 0.1 to 1.0 μm as iron group elements,
Particle size 1.0 to 10.0 μm as Group 6a element of the periodic table
Powders of WC and Cr ₃ C ₂ are mixed and pulverized in an organic solvent such as acetone for about 68 hours, paraffin is added, and a pressure of 1.5 ton / cm ² is applied to obtain a diameter of 1.0. It was pressed into a cylindrical shape having a length of about 3.0 cm and a length of about 5 cm. The obtained molded body was debindered at a predetermined temperature in a non-oxidizing atmosphere, and then vacuum fired at a predetermined temperature in a vacuum heating furnace for 10 hours to obtain a gold-colored sintered alloy. At this time, although W and Cr were added as carbides as raw material powder, they were melted in the binding metal as metal W and metal Cr in the firing process, or TiN and Ti were used.
Since it forms a solid solution in CN, WC and Cr ₃ C ₂ are contained in the sintered alloy.
Does not exist in the form of. Further, TiN and TiCN are preferably present in the sintered alloy as crystal particles having a particle size of 10 μm or less.

The firing conditions are such that the degree of vacuum is 10 ^-1 to 10
Baking at a temperature of 1300 to 1800 ° C under reduced pressure or no pressure in an atmosphere of ^-4 torr or a non-oxidizing atmosphere. The firing time is usually 5 to 15 hours, depending on the size of the product.

This sintered body was ground with an NC machine tool or the like and then mirror-finished to obtain the arrowhead 1 of the present invention.

With respect to the products thus obtained, the bending strength, Vickers hardness (Hv), porosity and corrosion resistance were measured using test pieces. JIS R1
According to the three-point bending test method of 601, the Vickers hardness was measured according to the JISZ2244 test method, and the porosity was measured according to the Archimedes method. And for the corrosion resistance test, artificial sweat (p
h4.7) is used as a corrosive liquid, and the lower half of the mirror-finished sample is immersed in artificial sweat kept at a temperature of 40 ± 2 ° C for 24H, and the condition of the polished surface of the sample after immersion is observed. It was In addition, a use test for checking chipping resistance was performed using the arrow heads made of each sample, and evaluated as very good (◯), good (Δ), and poor (x).

The results are shown in Table 1, as shown in Table 1. Sample Nos. 4 and 5 have a porosity of more than 5%, so that the bending strength is 80 kg / m.
It was lower than m ² , and the chipping resistance was poor. On the other hand, No. Nos. 1, 2, and 3 have a porosity of 5% or less and a bending strength of 80 kg / mm ² or more, and since they have excellent chipping resistance, they can be used without any problem as arrowheads. Therefore, with a porosity of 5% or less, a bending strength of 80 kg / m
It can be seen that m ² or more is preferable.

The color tone of the polished surface of the sintered alloy of the present invention was graceful and had a clear golden color and had a remarkably excellent decorative effect. Furthermore, the result of the corrosion resistance test was very good, and neither discoloration nor corrosion was observed. Further, the bending strength was 120 kg / mm ² or more, and the Vickers hardness was 1200 kg / mm ² or more, which was extremely high strength and high hardness.

[0026]

[Table 1]

Next, an example in which the arrowhead 1 of the present invention is made of colored zirconia ceramics will be described.

ZrO ₂ which is the main component contains 3 as a stabilizer.
A raw material obtained by adding and mixing mol% Y ₂ O ₃ and various colorants was cylindrically press-molded, and the obtained molded body was fired at a temperature of 1400 to 1500 ° C. in an oxidizing atmosphere.
After firing, grinding and polishing were carried out to obtain Yajiri 1 having a glossy and smooth mirror surface.

With respect to the arrowhead thus obtained, the bending strength was measured, and the same usage test as above was conducted to examine the chipping resistance.

The results are shown in Table 2, and the bending strength is 80 kg.
It can be seen that the use of colored zirconia ceramics of / mm ² or more has excellent chipping resistance and can be sufficiently used. Further, since this colored zirconia ceramic has a high Vickers hardness of 1100 kg / mm ² or more, it is hard to wear and can be used for a long period of time, and various color tones can be obtained depending on the type of the coloring agent, so that it is extremely decorative. Will be things.

[0031]

[Table 2]

Needless to say, the present invention can be applied not only to a Japanese bow arrow but also to an arrowhead such as an archery or a bowgun, and further, a demon arrow used as an ornament for various dolls such as Japanese shapes and May dolls. Etc. can also be applied.

[0033]

As described above, according to the present invention, since the arrowheads forming the arrow are made of a sintered body having a bending strength of 80 kg / mm ² or more, wear resistance, corrosion resistance, and chipping resistance are achieved. It is possible to provide an arrowhead that is excellent in use and can be used favorably for a long time.

If a colored sintered body such as a gold-colored sintered alloy or colored zirconia ceramics is used as the arrowhead, it is possible to provide the arrowhead having a clear and elegant color tone mirror surface and excellent decorativeness.

[Brief description of drawings]

FIG. 1 is a side view showing an arrow for a Japanese bow using the arrow head of the present invention.

FIG. 2 is an enlarged view of an arrowhead portion in FIG.

FIG. 3 is a view showing another embodiment of the arrowhead of the present invention.

[Explanation of symbols]

 1. Yajiri 2. Axis 3. Arrow blade 4. Yah

Claims (2)

[Claims] 1. An arrow head provided at the tip of an arrow, comprising a sintered body having a bending strength of 80 kg / mm ² or more. 2. The arrowhead according to claim 1, wherein the sintered body is a colored sintered body such as a gold-colored sintered alloy or colored zirconia ceramics.