JP4913910B1 - Manufacturing method of wire drawing material for pachinko nails - Google Patents

Manufacturing method of wire drawing material for pachinko nails Download PDF

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JP4913910B1
JP4913910B1 JP2011017320A JP2011017320A JP4913910B1 JP 4913910 B1 JP4913910 B1 JP 4913910B1 JP 2011017320 A JP2011017320 A JP 2011017320A JP 2011017320 A JP2011017320 A JP 2011017320A JP 4913910 B1 JP4913910 B1 JP 4913910B1
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wire drawing
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pachinko
drawing material
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悦郎 森山
久則 金沢
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SAN-ETSU METALS Co.,Ltd.
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Abstract

【課題】 従来のパチンコ釘以上に折れにくく耐久性に優れたパチンコ釘及びそれに適した銅基合金からなる伸線材の提供を目的とする。
【解決手段】質量%で、Cu:63.0〜67.0%、Pb:0.05%以下、Fe:0.05%以下及び残部がZnと不純物からなる銅基合金を用いた伸線材であって、平均結晶粒径が10μm以下であることを特徴とする。
この伸線材を加工してパチンコ釘を製造する。
【選択図】 図1
PROBLEM TO BE SOLVED: To provide a pachinko nail that is less likely to break than a conventional pachinko nail and has excellent durability and a wire drawing material made of a copper-based alloy suitable for the nail.
A wire drawing material using a copper-based alloy consisting of Cu: 63.0 to 67.0%, Pb: 0.05% or less, Fe: 0.05% or less, and the balance being Zn and impurities. The average crystal grain size is 10 μm or less.
Pachinko nails are manufactured by processing this wire drawing material.
[Selection] Figure 1

Description

本発明は、パチンコ遊技機に用いられる釘及びこのパチンコ釘の製造に適した伸線材に関する。   The present invention relates to a nail used in a pachinko gaming machine and a wire drawing material suitable for manufacturing the pachinko nail.

パチンコ遊技機に用いられるパチンコ台の盤面には多数の釘が打たれている。
このパチンコ釘に小さな鋼球であるパチンコ玉が繰り返し当たり、これに耐えられるだけの耐久性が要求される。
近年、パチンコ台の高機能化に伴い、従来以上の耐久性がパチンコ釘にも要求されている。
現在、パチンコ台の盤としては、主にベニア合板製のパネルと樹脂製のパネルの二種類があり、これに合せて釘も長さが約33mmのものと約26mmのもの二種類が一般的に用いられている。
Numerous nails are struck on the surface of the pachinko machine used in pachinko machines.
A pachinko ball, which is a small steel ball, repeatedly hits this pachinko nail and is required to be durable enough to withstand this.
In recent years, pachinko nails have been required to have higher durability than ever with the advancement of functionality of pachinko machines.
Currently, there are two main types of pachinko machine panels: veneer plywood panels and resin panels, and two types of nails with a length of about 33 mm and about 26 mm are common. It is used for.

特許文献1に、パチンコ台用の釘(部品)に使用できる銅合金を開示するが、必ずしもパチンコ釘に適したものではない。   Patent Document 1 discloses a copper alloy that can be used for nails (parts) for pachinko machines, but is not necessarily suitable for pachinko nails.

特許第3303301号公報Japanese Patent No. 3303301

本発明は、従来のパチンコ釘以上に折れにくく、耐久性に優れたパチンコ釘及びそれに適した銅基合金からなる伸線材の提供を目的とする。   An object of the present invention is to provide a pachinko nail that is less likely to break than a conventional pachinko nail and is excellent in durability, and a wire drawing material made of a copper-based alloy suitable therefor.

本発明に係るパチンコ釘用伸線材は、質量%で、Cu:63.0〜67.0%、Pb:0.05%以下、Fe:0.05%以下及び残部がZnと不純物からなる銅基合金を用いた伸線材であって、平均結晶粒径が10μm以下であることを特徴とする。
従来、一般的に使用されている黄銅製パチンコ釘の金属組織の平均結晶粒径は20〜30μmであったのに対して、本発明に係る伸線材の平均結晶粒径は10μm以下であり、好ましくは5μm以下にすることで、この伸線材を用いて製造されたパチンコ釘は、弾かれながら落ちるパチンコ玉に対して長期間折れにくくなり、耐久性が向上する。
The wire drawing material for pachinko nails according to the present invention is, by mass%, Cu: 63.0 to 67.0%, Pb: 0.05% or less, Fe: 0.05% or less, and the balance being Zn and impurities. A wire drawing material using a base alloy, wherein an average crystal grain size is 10 μm or less.
Conventionally, the average crystal grain size of the metal structure of brass pachinko nails that are generally used was 20 to 30 μm, whereas the average crystal grain size of the wire drawing material according to the present invention is 10 μm or less, The pachinko nail manufactured using this wire drawing material is preferably not more than 5 μm, so that it is difficult to break for a long time against a pachinko ball falling while being bounced, and durability is improved.

このようなパチンコ釘用伸線材の製造方法としては、質量%で、Cu:63.0〜67.0%、Pb:0.05%以下、Fe:0.05%以下及び残部がZnと不可避的不純物からなる銅基合金を用いて、直径6〜8mmの押出線押出加工し、当該押出線を直径2.0〜2.5mmの伸線に伸線加工し、次に350〜450℃の温度で焼鈍し、次に直径1.8〜1.9mmの伸線に伸線加工する方法が適している。
伸線材の製造条件から説明すると、押出線を減面率84〜94%(好ましくは88〜92%)の範囲になるように引き抜き伸線加工し、その後に350〜450℃の温度で焼鈍し、さらに減面率37〜43%の範囲に入るように引き抜き伸線加工すると平均結晶粒径の大きさが10μm以下になる。
上記の方法で製造された伸線材は所定の長さに切断され、直径約4mmの頭部及び先端部を鍛造及び転造加工することでパチンコ釘となる。
As a method for producing such a wire drawing material for pachinko nails, in mass%, Cu: 63.0 to 67.0%, Pb: 0.05% or less, Fe: 0.05% or less, and the balance of Zn is inevitable. Using a copper-based alloy composed of mechanical impurities, the extruded wire is extruded to a diameter of 6 to 8 mm, the extruded wire is drawn to a diameter of 2.0 to 2.5 mm, and then 350 to 450 ° C. A method of annealing at a temperature of 1 to 1.9 mm and then drawing to a diameter of 1.8 to 1.9 mm is suitable.
Explaining from the manufacturing conditions of the wire drawing material, the drawn wire is drawn and drawn so that the area reduction is in the range of 84 to 94% (preferably 88 to 92%), and then annealed at a temperature of 350 to 450 ° C. Further, when the drawing and drawing are performed so that the area reduction rate falls within the range of 37 to 43%, the average crystal grain size becomes 10 μm or less.
The wire drawing material manufactured by the above method is cut into a predetermined length, and a pachinko nail is formed by forging and rolling a head and a tip having a diameter of about 4 mm.

本発明に係るパチンコ釘は、従来のパチンコ釘と比較し、耐力値が向上し、繰り返し曲げ試験及びパチンコ玉当て試験においても優れた耐久性を有する。
従って、パチンコ台の使用期間の長寿命化に貢献できる。
The pachinko nail according to the present invention has an improved proof stress as compared with conventional pachinko nails, and has excellent durability in repeated bending tests and pachinko ball hitting tests.
Therefore, it can contribute to extending the service life of the pachinko machine.

伸線材の機械的特性の評価結果を示す。The evaluation result of the mechanical property of a wire drawing material is shown. 伸線材の断面硬度測定結果を示す。The cross-sectional hardness measurement result of a wire drawing material is shown. 伸線材の金属組織写真を示し、(a)は本発明伸線材、(b)は従来材の比較材の顕微鏡写真を示す。The metal structure photograph of a wire drawing material is shown, (a) is a wire drawing material of the present invention, and (b) is a micrograph of a comparative material of a conventional material. 本発明に係るパチンコ釘の外観写真を示し、(a)は釘長さ33mmの例で(b)は釘長さ26mmの例である。The external appearance photograph of the pachinko nail which concerns on this invention is shown, (a) is an example of nail length 33mm, (b) is an example of nail length 26mm. 15°両振り繰返し曲げ試験結果を示す。The results of a 15 ° double swing repeated bending test are shown. 30°片振り繰返し曲げ試験結果を示す。The results of a 30 ° single swing repeated bending test are shown. 玉当て試験結果を示す。The ball bearing test results are shown.

以下、本発明に係る伸線材の製造例とその材料特性及び試作したパチンコ釘の評価結果について説明する。
Cu:63.0〜67.0%(以下全て質量%)、Pb:0.05%以下、Fe:0.05%以下で残部がZnと不純物になるように黄銅合金の溶湯を調整し、黄銅材を鋳造した。
次に、φ7mmの丸線に押出加工し、この押出線をφ2.20mm伸線に伸線加工した。
このときの減面率は約90%である。
次に400℃の雰囲炉で連続焼鈍(2.3m/min)した。
さらに、φ1.835mm伸線に伸線加工(減面率約40%)し、本発明に係るパチンコ釘用伸線材を得た。
Hereinafter, the example of manufacture of the wire drawing material which concerns on this invention, its material characteristic, and the evaluation result of the pachinko nail made as an experiment are demonstrated.
Cu: 63.0 to 67.0% (all mass% hereinafter), Pb: 0.05% or less, Fe: 0.05% or less, and adjust the molten alloy of brass alloy so that the balance becomes Zn and impurities, Brass material was cast.
Next, it was extruded into a φ7 mm round wire, and this extruded wire was drawn into a φ2.20 mm wire.
The area reduction rate at this time is about 90%.
Next, continuous annealing (2.3 m / min) was performed in an atmosphere furnace at 400 ° C.
Further, the wire was drawn into φ1.835 mm (area reduction rate of about 40%) to obtain a wire for pachinko nails according to the present invention.

一方、比較伸線材として上記鋳造材をφ8mmの押出線に押出加工し、この押出線をφ2.43mmの伸線に伸線加工し、雰囲炉620℃にてスピード2.3m/minで連続焼鈍し、次にφ1.835mmの伸線に伸線加工し比較伸線材を得た。   On the other hand, the above cast material was extruded into a φ8 mm extrusion wire as a comparative wire drawing material, this extrusion wire was drawn into a φ2.43 mm wire drawing, and continuously annealed at a speed of 2.3 m / min in an atmosphere furnace 620 ° C. Next, the wire was drawn to a diameter of 1.835 mm to obtain a comparative wire drawing material.

伸線材の機械特性の評価結果を図1の表に示す。
これより、発明伸線材は比較伸線材と比べて引張り強さ、伸び表面硬度は同等だが、0.2%耐力が10N/mm程度高めになっており、図3に金属組織の写真例を示すように、(a)に示した発明伸線の平均結晶粒径は4〜5μmと(b)に示した従来の比較伸線材の平均結晶粒径20〜25μmより小さくなっていることが分かる。
なお、平均結晶粒径は、ランダムに10カ所測定し、その平均値とした。
また、伸線材の断面を中心から外周に向けて0.2mm刻みでビッカース硬度を測定した結果を図2のグラフに示す。この結果、発明伸線材は従来の比較伸線材と同等の結果であった。
尚、発明伸線材の表面状態は良好であり比較伸線材と差異は認められなかった。
The evaluation results of the mechanical properties of the wire drawing material are shown in the table of FIG.
Thus, the inventive wire drawing material has the same tensile strength and elongation surface hardness as compared with the comparative wire drawing material, but the 0.2% proof stress is about 10 N / mm 2 higher. As shown, the average crystal grain size of the inventive wire drawing shown in (a) is 4-5 μm, which is smaller than the average crystal grain size of the conventional comparative wire drawing shown in (b) of 20-25 μm. .
The average crystal grain size was measured at 10 random locations, and the average value was taken.
Moreover, the graph of FIG. 2 shows the result of measuring the Vickers hardness in increments of 0.2 mm from the center of the wire drawing material toward the outer periphery. As a result, the inventive wire drawing material had the same result as the conventional comparative wire drawing material.
The surface condition of the inventive wire drawing material was good and no difference from the comparative wire drawing material was observed.

次に、上記の伸線材を用いて釘長さ約26mm頭径約φ4mm[図4(b)]のパチンコ釘を製造し、繰返し曲げ試験と玉当て試験を実施し、その結果を図5〜図7に示す。
<試験条件>
(1)15°両振り繰返し曲げ試験
釘の先をバイスに挟み、垂直状態に固定し、一方に15°折り曲げ、それから反対側に15°折り曲げる工程を1回として繰り返し折り曲げ試験を実施し、破断するまでの折り曲げ回数をカウントする。
(2)30°片振り繰返し曲げ試験
釘の先をバイスに挟み、垂直状態に固定し、一方に30°折り曲げ、それから垂直に戻す工程を1回として繰り返し折り曲げ試験を実施し、破断するまでの折り曲げ回数をカウントする。
(3)玉当て試験
予備的に、釘の先を固定し、垂直状態から10°(保持時間1秒)の曲げを2000回繰り返した(高越鋼業株式会社製 釘屈曲試験機)後に、パチンコ玉を発射圧0.28MPa、発射速度100発/minの条件で玉当て試験(高越鋼業株式会社製 釘耐久試験機)を実施し、釘が折れるまでの発射回数をカウントする。
(なお、玉当てには厚み10mmの樹脂製パネルに内径1.85mmの下穴を明け、これに長さ26mmの釘を打ち付け試験に供した。)
これより、15°両振り繰返し曲げ試験では発明釘は平均値942回での破断に対し、比較釘は平均値773回での破断と、発明釘の方が比較釘に比べて平均約22%耐久性が優れていることが確認できた(試験N数5回)。
また、30°片振り繰返し曲げ試験では発明釘は平均値394回での破断に対し、比較釘は平均値305回での破断と、発明釘の方が比較釘に比べて平均約29%耐久性が優れていることが確認できた(試験N数5回)。
玉当て試験は、試験N数10個の平均で発明釘が約5900回の発射回数で折れたのに対し、比較釘は約2360回で折れたことから2倍以上も寿命が延びたことになる。
Next, a pachinko nail having a nail length of about 26 mm and a head diameter of about φ4 mm [FIG. 4B] is manufactured using the wire drawing material described above, and a repeated bending test and a ball hitting test are performed. As shown in FIG.
<Test conditions>
(1) 15 ° double swing repeated bending test Nail tip is sandwiched between vise, fixed vertically, bent 15 ° on one side, and then bent 15 ° on the opposite side. Count the number of folds until it is done.
(2) 30 ° single swing repeated bending test The nail tip is sandwiched between vise, fixed in a vertical state, 30 ° bent on one side, and then the process of returning to vertical is repeated once until the fracture. Count the number of folds.
(3) Ball bearing test Preliminarily, after fixing the tip of the nail and bending the vertical state 10 ° (holding time 1 second) 2000 times (Takoshi Steel Co., Ltd. nail bending tester), A pachinko ball is subjected to a ball contact test (nail durability tester manufactured by Takakoshi Steel Co., Ltd.) under the conditions of a firing pressure of 0.28 MPa and a firing speed of 100 shots / min, and the number of firings until the nail breaks is counted.
(In addition, a ball hole was drilled with a 1.85 mm inner diameter pilot hole in a 10 mm thick resin panel, and a 26 mm long nail was struck for the test.)
Thus, in the 15 ° double swing repeated bending test, the nail of the invention broke at an average value of 942 times, whereas the comparative nail broke at an average value of 773 times, and the nail of the invention had an average of about 22% compared to the comparative nail. It was confirmed that the durability was excellent (test N number 5 times).
In addition, in the 30 ° single swing repeated bending test, the inventive nail broke at an average value of 394 times, whereas the comparative nail broke at an average value of 305 times, and the inventive nail had an average durability of about 29% compared to the comparative nail. It was confirmed that the properties were excellent (test N number 5 times).
In the ball hitting test, the nail of the invention was broken by the number of firings of about 5900 times on the average of the test N number of 10, whereas the comparative nail was broken by about 2360 times, so the life was extended more than twice. Become.

Claims (1)

質量%で、Cu:63.0〜67.0%、Pb:0.05%以下、Fe:0.05%以下及び残部がZnと不可避的不純物からなる銅基合金を用いて、直径6〜8mmの押出線に押出加工し、当該押出線を直径2.0〜2.5mmの伸線に伸線加工し、次に350〜450℃の温度で焼鈍し、次に直径1.8〜1.9mmの伸線に伸線加工し、最終的に得られた伸線材の平均結晶粒径が10μm以下であることを特徴とするパチンコ釘用伸線材の製造方法。   Using a copper-based alloy consisting of Cu: 63.0 to 67.0%, Pb: 0.05% or less, Fe: 0.05% or less, and the balance consisting of Zn and inevitable impurities, and having a diameter of 6 to 6% by mass. Extruded into an 8 mm extrusion wire, the extrusion wire was drawn into a 2.0-2.5 mm diameter wire, then annealed at a temperature of 350-450 ° C., then a diameter of 1.8-1 A method for producing a wire rod for a pachinko nail, characterized in that the average crystal grain size of the wire rod finally obtained by wire drawing to 9 mm is 10 μm or less.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07275447A (en) * 1994-04-13 1995-10-24 Toei Seibiyou Kk Manufacture of japanese pin ball game panel and nails for japanese pin ball game machine
WO2004022805A1 (en) * 2002-09-09 2004-03-18 Sambo Copper Alloy Co., Ltd. High-strength copper alloy
JP2009160103A (en) * 2007-12-28 2009-07-23 Sanyo Product Co Ltd Game machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07275447A (en) * 1994-04-13 1995-10-24 Toei Seibiyou Kk Manufacture of japanese pin ball game panel and nails for japanese pin ball game machine
WO2004022805A1 (en) * 2002-09-09 2004-03-18 Sambo Copper Alloy Co., Ltd. High-strength copper alloy
JP2009160103A (en) * 2007-12-28 2009-07-23 Sanyo Product Co Ltd Game machine

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