JP3472321B2 - Arrow ass - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrowhead constituting an arrow of a Japanese bow or a Western bow. 2. Description of the Related Art As shown in FIG. 1, an arrow for a Japanese bow is provided with an arrow blade 3 and an arrowhead 4 at the rear end of a shaft 2 having an arrowhead 1 at the tip.
It is provided with. Then, the arrow that is blown by the bow with the arrowhead 1 at the top is such that the arrowhead 1 is stuck. The arrowhead 1 is formed of iron or a copper alloy, and has a protruding portion 1 at its tip so as to be easily pierced.
a. [0003] These arrows are used not only for archery competitions but also for decoration as a kind of traditional craft. [0004] Further, the arrow for a bow also has a structure basically similar to that for the Japanese bow. [0005] However, iron arrowhead 1
However, when left for a long time, there is a problem that rust is easily generated and wear is apt to occur, so that it cannot be used for a long time. The arrowhead 1 made of a copper alloy hardly rusted, but was more severely abraded and had a shorter life than that of an iron. Further, in the case of an arrow for a Japanese bow used for decoration, there is a problem that the iron or copper alloy arrowhead 1 has poor decorativeness. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and has an arrowhead made of a sintered body such as ceramic or cermet. Since a large impact is applied when the arrow hits the target, a sintered body having a transverse rupture strength of 80 kg / mm ² or more is used to prevent chipping and cracking. Further, in order to provide decorativeness, a sintered body colored in golden or other colors may be used. As such a sintered body, a golden sintered alloy or a colored zirconia ceramic can be used. The golden sintered alloy according to the present invention comprises TiC, Ti
This is a sintered body obtained by firing a formed body containing N as a main component and then performing mirror finishing. In general, a sintered alloy containing Ti has a high strength and an elegant color, but has a disadvantage of poor chipping resistance. Thus, the present invention has solved this problem by improving the material. That is, the golden sintered alloy of the present invention contains 55 to 75% by weight of Ti in the total amount, 3 to 29% by weight of the total of the group 6a element in the periodic table containing the iron group element and at least Cr, and the balance being It is composed of a non-metallic element, and the ratio of Cr in the metallic element excluding Ti is 40% by weight or more. Here, the iron group elements include Ni and F
e, Co, and Cr, Mo,
There is W, and carbon (C) and nitrogen (N) are nonmetallic elements.
There is. The sintering of the sintered alloy is performed by hot pressing, HIP or the like in addition to sintering under vacuum, and by setting the porosity of the sintered body to 5% or less, the transverse rupture strength is 100 kg / mm.
It can be ² or more. The average crystal grain size is 3 μm
By setting the following, the stress acting on each particle was reduced, and the occurrence of shedding was suppressed. With these ingenuity, not only color tone,
It was possible to obtain a strong gold sintered alloy which was strong and had little chipping. Further, the colored zirconia ceramic, the ZrO ₂ is a major _{component, Y 2 O 3, CaO,} MgO, C
a stabilizer comprising at least one of eO _{2 and the} like;
This is a sintered body obtained by adding and mixing a coloring agent made of at least one metal oxide such as Cr, Ni, Co, and Mn, forming the obtained raw material into a predetermined shape, and firing. The amount of the stabilizer is adjusted so that the sintered body contains at least 50%, preferably at least 80% of tetragonal zirconia crystals, and the average crystal particle diameter is 2 μm.
By using a partially stabilized zirconia ceramic of m or less, preferably 1 μm or less, a sintered body having high strength and toughness can be obtained. By adjusting the type and amount of the coloring agent, the coloring agent can be colored in various colors. For applications that do not require special decorativeness, such as a competition arrow, a white zirconia ceramic containing no coloring agent may be used. According to the present invention, by forming the arrowhead with a sintered body such as a golden sintered alloy or a colored zirconia ceramic, the arrowhead having excellent corrosion resistance and wear resistance and having a beautiful appearance can be obtained. Obtainable. Embodiments of the present invention will be described below. As shown in FIG. 1 and FIG.
Is composed of a sintered body having a bending strength of 80 kg / mm ² or more,
It is a substantially cylindrical body having a protruding portion 1a at the tip.
Is provided at the front end of the shaft 2, and the blade 2 and the arrowhead 4 are provided at the rear end side of the shaft 2. Further, the tip of the arrowhead 1 is formed with a protruding portion 1a so as to be easily pierced, but may have a curved tip as shown in FIG. As the sintered body forming the arrowhead 1, a colored sintered body such as a golden sintered alloy or a colored zirconia ceramic is used. Examples of the golden sintered alloy will be described in detail below. First, TiN and TiCN having a particle size of 0.5 to 3.0 μm as Ti nitride and carbonitride, Ni and Co having a particle size of 0.1 to 1.0 μm as an iron group element,
Particle size 1.0 to 10.0 μm as Group 6a element of the periodic table
WC and Cr ₃ C ₂ powders were weighed and mixed, mixed and pulverized in an organic solvent such as acetone for about 68 hours, paraffin was added, and a diameter of 1.0 ton / cm ² was applied. It was press-molded into a column having a length of about 3.0 cm and a length of about 5 cm. After debinding the obtained molded body in a non-oxidizing atmosphere at a predetermined temperature, vacuum firing was performed in a vacuum heating furnace at a predetermined temperature for 10 hours to obtain a golden sintered alloy. At this time, W and Cr were added as carbides as raw material powders, but were melted in the binding metal as metal W or metal Cr during the firing process, or TiN or Ti was added.
WC and Cr ₃ C _{2 in the} sintered alloy
Does not exist in the form of It is desirable that TiN and TiCN are 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
Calcination is performed 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. The 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 product thus obtained, the bending strength, Vickers hardness (Hv), porosity and corrosion resistance were measured using test pieces. The bending strength is measured according to JISR1
The Vickers hardness was measured according to the JISZ2244 test method, and the porosity was measured according to the Archimedes method. As for the corrosion resistance performance test, artificial sweat (p) according to the ISO (World Standards Organization) standard was used.
h4.7) was used as a corrosive liquid, and the lower half of the mirror-finished sample was immersed in artificial sweat maintained at a temperature of 40 ± 2 ° C. for 24H, and the state of the polished surface of the sample after immersion was observed. Was. In addition, a use test for examining chipping resistance was performed using an arrowhead made of each sample, and evaluated as very good (（), good (△), and bad (x). As shown in Table 1, the results are as shown in FIG. Since the porosity of the samples of Nos. 4 and 5 is larger than 5%, the flexural strength is 80 kg / m.
m ² , and the chipping resistance was poor. On the other hand, no. Samples Nos. 1, 2, and 3 have a porosity of 5% or less and a transverse rupture strength of 80 kg / mm ² or more, and are excellent in chipping resistance and can be used without problems as arrowheads. Therefore, the buckling strength is 80 kg / m when the porosity is 5% or less.
It is understood that those having m ² or more are good. The color tone of the polished surface of the sintered alloy according to the present invention exhibited an elegant and 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 recognized. Further, the transverse rupture strength was 120 kg / mm ² or more, and the Vickers hardness was 1200 kg / mm ² or more, showing very high strength and high hardness. [Table 1] Next, an example in which the arrowhead 1 of the present invention is formed of colored zirconia ceramics will be described. ZrO ₂ , which is the main component, has 3
A raw material obtained by adding and mixing mol% of Y ₂ O ₃ and various colorants was press-formed into a columnar shape, and the obtained formed body was fired at a temperature of 1400 to 1500 ° C. in an oxidizing atmosphere.
After firing, grinding and polishing were performed to obtain an arrowhead 1 having a glossy and smooth mirror surface. With respect to the arrowhead thus obtained, the bending strength was measured, and the same use test as described above was performed to examine the chipping resistance. The results are as 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 used satisfactorily. In addition, the colored zirconia ceramic has a high hardness of Vickers hardness of 1100 kg / mm ² or more, so that it is hard to be worn and can be used for a long period of time. It will be. [Table 2] It is needless to say that the present invention can be applied not only to Japanese bows but also to arrowheads such as archery and bow guns. And so on. As described above, according to the present invention, since the arrowhead constituting the arrow is formed of a sintered body having a transverse rupture strength of 80 kg / mm ² or more, wear resistance, corrosion resistance, It is possible to provide an arrowhead which has excellent chipping resistance and can be used favorably for a long time. If a colored sintered body such as a golden sintered alloy or colored zirconia ceramics is used as the arrowhead, it is possible to provide an arrowhead having a mirror surface with a clear and elegant color tone and excellent decorativeness.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an arrow for a Japanese bow using an arrowhead 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 Codes] Yajiri2. Axis 3. Arrow feather 4. Arrow

Claims (1)

(57) [Claim 1] An arrowhead provided at the tip of an arrow, which is a golden sintered alloy or colored zircon having a transverse rupture strength of 80 kg / mm ² or more.
It is made of colored sintered body such as near ceramics.
Arrowhead to.