JP2006292717A - Bolt and manufacturing method - Google Patents
Bolt and manufacturing method Download PDFInfo
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- JP2006292717A JP2006292717A JP2005254102A JP2005254102A JP2006292717A JP 2006292717 A JP2006292717 A JP 2006292717A JP 2005254102 A JP2005254102 A JP 2005254102A JP 2005254102 A JP2005254102 A JP 2005254102A JP 2006292717 A JP2006292717 A JP 2006292717A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
Description
本発明は、超音波等での軸力測定ボルトに関するものである。The present invention relates to an axial force measurement bolt using ultrasonic waves or the like.
従来より、軸力測定ボルトとしては、超音波等の軸力測定器具を用いてボルト頭部平面と端部平面とで軸力測定することが一般的である。 Conventionally, as an axial force measuring bolt, it is common to measure an axial force on a bolt head plane and an end plane using an axial force measuring instrument such as an ultrasonic wave.
しかしながら、超音波等の軸力測定器具を用いるには前記両平面部を形成するのに切削及び研磨して形成するか、冷間圧造で両平面部を形成するかであるが、切削及び研磨はコスト高であり、また冷間圧造の2段工程で平面部を形成させるには頭部6角の対角の張りが悪くなるので、より多段工程で平面部を加工するか、頭部に凹部形状の平面部を形成させ対角を張らせるかであるが、多段工程はコスト高であり、凹部形状は超音波等のセンサ−部の大きさが凹部に入る大きさに限定されてしまう。また軸力がかかった時に頭部平面部にそりの影響で軸力測定に誤差があらわれることがあり、挿入性でボルト端部にC面部を形成させるが、冷間圧造の場合では多段工程でないと平面部とC面部が形成できない。あるいは切削加工等となり、軸力測定ボルトはやはりコストが高いという問題があった。 However, in order to use an axial force measuring instrument such as an ultrasonic wave, the two flat portions are formed by cutting and polishing, or the two flat portions are formed by cold forging. Is costly, and in order to form a flat part in the two-step process of cold heading, the diagonal tension of the head hexagon is worsened. Although it is possible to form a recess-shaped flat portion and make it diagonal, the multi-step process is expensive, and the recess shape is limited to the size of the sensor part such as ultrasonic waves entering the recess . Also, when axial force is applied, there may be errors in axial force measurement due to the warp on the flat part of the head, and the C surface part is formed at the bolt end due to insertability, but in the case of cold heading, it is not a multistage process. And a plane part and a C surface part cannot be formed. Or it became a cutting process etc., and the axial force measuring bolt had a problem that the cost was still high.
従って、本発明の課題はコストが安いボルト頭部及び端部の形状及び製造方法を発明し、安価な軸力測定ボルトを提供することである。Accordingly, an object of the present invention is to invent a bolt head and end shape and manufacturing method at low cost and to provide an inexpensive axial force measuring bolt.
本発明は上記従来の課題を解決するための手段として、ボルト頭部が多角形状であり、その頭部上面が外部多角形状に頂点位置を合わせた多角形状の溝を頭部上面内部にもち、その多角形状は6〜12の範囲で形成されており、上面内部の多角溝の内側は多角形状または円形状の平面部が形成されている。前記ボルト上面の多角外部と多角溝内側平面部との高さは同じか多角溝内側平面部が若干高い位置であり、多角溝内側平面部の直径は多角外部2面巾の1/5から4/5の範囲であり、多角溝底面は軸部に対して頭部上面側に−30°から+30°の範囲で傾斜し、多角溝深さは頭部高さの1/2以内で形成されている。これらの前記ボルトの頭部は冷間圧造機において2〜4段工程で加工し、同時に軸部及びボルト先端部のカット平面部が形成されている。カット平面部は頭部平面部と平行度が0.1mm以下で平均粗さRzを12.5以下とする。前記ボルトの先端部は垂直な平面から転造加工で軸部のねじ加工と同時に先端内部に平面部を残し、外側を伸ばしながらC面部を形成させる。本発明ボルトは冷間圧造2〜4段工程加工及び転造加工で形成させ、安価な軸力測定ボルトを製作することである。 As a means for solving the above-mentioned conventional problems, the present invention has a polygonal groove in which the bolt head has a polygonal shape, the top surface of the head is aligned with the apex position of the external polygonal shape, The polygonal shape is formed in the range of 6 to 12, and a polygonal or circular plane portion is formed inside the polygonal groove inside the upper surface. The height of the polygon outer surface of the bolt upper surface and the polygon groove inner plane portion are the same or the position of the polygon groove inner plane portion is slightly higher, and the diameter of the polygon groove inner plane portion is from 1/5 to 4 / The polygonal groove bottom surface is inclined in the range of −30 ° to + 30 ° to the head upper surface side with respect to the shaft portion, and the polygonal groove depth is formed within ½ of the head height. Yes. The heads of these bolts are processed in a cold forging machine in two to four steps, and at the same time, the shaft and the cut flat portion of the bolt tip are formed. The cut plane part has a parallelism with the head plane part of 0.1 mm or less and an average roughness Rz of 12.5 or less. The front end portion of the bolt is formed by rolling from a vertical plane, and at the same time as the threading of the shaft portion, the flat surface portion is left inside the front end, and the C surface portion is formed while extending the outside. The bolt of the present invention is formed by cold forging 2 to 4 step process and rolling process to produce an inexpensive axial force measuring bolt.
本発明の軸力測定ボルトは冷間圧造機を用い2段工程でボルト多角頭部にその頭部上面が外部多角形状に頂点位置を合わせた多角形状の溝とその内側に平面部を形成させることによって頭部多角対角を充分に張らせ、ボルト上面の多角外部と多角溝内側平面部との高さは同じか若干高いので、超音波等のセンサーの大きさに関係なく測定ができ、また軸力がかかった時に頭部多角形状の溝でそりを吸収し、平面部にそりの影響がでない超音波等での軸力測定が可能となる。また2段工程で同時に軸部と先端部のカット平面部を形成させ、軸部と先端部を転造加工で、ねじ加工しながら同時に先端内部に平面部を最大限残しながらC面部を形成させれば、先端内部の平面部の面積が従来のC面加工より大きくとれるので、従来のC面加工に比べて超音波等での軸力測定が正確となり、また先端部の平面部が内部に形成されているので、打コン等のキズがつきにくいので、超音波軸力測定時の打コン等による反射ノイズの影響が減る。本発明ボルトはコストが通常ボルトとあまり変わらず安価で製作できるので、通常ボルトとしても利用でき、その場合は検査等での軸力測定はいつでもボルトを選ばずできる。又超音波式の軸力制御締め付け機を利用すれば軸力安定締め付けも可能である。The axial force measuring bolt according to the present invention uses a cold forging machine to form a polygonal groove in which the top surface of the head is aligned with the outer polygonal shape on the polygonal head of the bolt in a two-stage process and a flat portion on the inside thereof. By making the head polygon diagonally stretched sufficiently, the height of the polygon outer surface of the bolt upper surface and the polygon groove inner plane part is the same or slightly higher, so it can be measured regardless of the size of the sensor such as ultrasonic waves, Further, when an axial force is applied, the warp is absorbed by the groove having a polygonal shape on the head, and the axial force can be measured with an ultrasonic wave or the like that is not affected by the warp on the flat portion. In addition, the cut plane part of the shaft part and the tip part is formed at the same time in the two-stage process, and the C surface part is formed while the shaft part and the tip part are formed by rolling, and at the same time leaving the maximum flat part inside the tip part while screwing. As a result, the area of the flat portion inside the tip can be made larger than that of the conventional C-face machining, so that the axial force measurement with ultrasonic waves is more accurate than the conventional C-face machining, and the flat portion of the tip is located inside. Since it is formed, scratches such as hammering are hardly scratched, so that the influence of reflection noise due to hammering when measuring the ultrasonic axial force is reduced. The bolt of the present invention can be manufactured as a normal bolt because the cost is not much different from that of a normal bolt, and can be used as a normal bolt. In that case, the axial force measurement for inspection or the like can be performed at any time. Also, if an ultrasonic axial force control tightening machine is used, stable axial force tightening is possible.
以下、本発明の実施の形態について説明する。
本発明の一実施形態によるボルトを図1に示す。図1に示すボルト頭部が6角形状(5)であって、その頭部上面が外部6角形状に頂点位置を合わせた6角形状の溝(3)を上面内部に形成し、6角形状の溝(3)底面は軸部に対して頭部上面側に−30°(Xa)から+30°(Xb)以内で傾斜している。6角形状溝深さ(Ya、Yb、Yc)は頭部高さの1/2以内とする。前記ボルト上面内部の6角溝の内側は多角形状又は円形状の平面部(6)が形成されており、平面部(6)の直径は6角外部2面巾の1/5から4/5の範囲とする。前記ボルト上面の6角外部(5)と6角溝内側平面部(6)との高さは同じか6角溝内側平面部(6)が若干高い位置である。前記ボルトの製造方法は冷間圧造機において2〜4段工程で加工し、また同時に軸部と先端部のカット平面部(4a)を形成させる。カット平面部は頭部平面部と平行度が0.1mm以下で平均粗さRzを12.5以下とする。その後転造加工で軸部(2)と先端部の垂直なカット平面(4a)を軸部(2)のねじ加工をしながら同時に先端内部に平面部(4b)を最大限残し、外側を伸ばしながらC面部(7)が形成されている。Embodiments of the present invention will be described below.
A bolt according to an embodiment of the invention is shown in FIG. The bolt head shown in FIG. 1 has a hexagonal shape (5), and a hexagonal groove (3) in which the top surface of the head is aligned with the outer hexagonal shape is formed inside the top surface. The bottom surface of the shaped groove (3) is inclined within −30 ° (Xa) to + 30 ° (Xb) on the upper surface side of the head with respect to the shaft portion. The hexagonal groove depth (Ya, Yb, Yc) should be within ½ of the head height. A polygonal or circular plane portion (6) is formed inside the hexagonal groove inside the bolt upper surface, and the diameter of the plane portion (6) is 1/5 to 4/5 of the hexagonal outer two-surface width. Range. The heights of the hexagonal exterior (5) and the hexagonal groove inner plane part (6) on the upper surface of the bolt are the same or the hexagonal groove inner plane part (6) is slightly higher. The manufacturing method of the said bolt is processed in a 2-4 step process in a cold forging machine, and simultaneously forms a cut plane part (4a) of a shaft part and a tip part. The cut plane part has a parallelism with the head plane part of 0.1 mm or less and an average roughness Rz of 12.5 or less. After that, by rolling the shaft part (2) and the vertical cut plane (4a) perpendicular to the tip part, while screwing the shaft part (2), the plane part (4b) remains at the maximum inside the tip part and the outside is extended. However, the C surface portion (7) is formed.
図1に示すボルト頭部が6角形状(5)であって、その頭部上面が外部6角形状に頂点位置を合わせた6角形状の溝(3)を上面内部に形成し、望ましくは各コーナー部においては型寿命のために若干のR形状とする。6角形状の溝底面角度は軸部に対して頭部上面側に−30°(Xa)から+30°(Xb)以内で望ましくは+1°〜+2°傾斜させ内側を深く外側を浅くすれば、超音波軸力測定時の反射ノイズが減少し、頭部6角の対角の張り(8)も良くなる。6角形状溝深さ(Yb)は頭部高さの1/2以内で、望ましくは1/8くらいとする。前記ボルト上面内部の6角溝の内側は、多角形状又は円形状の望ましくは円形状の平面部(6)が形成されており、平面部(6)の直径は6角外部2面巾の1/5から4/5の範囲とし、望ましくは1/2くらいとする。前記ボルト上面の6角外部(5)と6角溝内側平面部(6)との高さは同じか望ましくは6角溝内側平面部(6)が若干高い位置とする。前記ボルトの製造方法は冷間圧造機において望ましくは2段工程で加工し、同時に軸部と先端部のカット平面部(4a)を形成させる。カット平面部は頭部平面部と平行度が0.1mm以下で平均粗さRzを12.5以下とする。その後転造加工で軸部(2)と先端部の垂直なカット平面(4a)を軸部(2)のねじ加工をしながら同時に先端内部に平面部(4b)を最大限残し、外側を伸ばしながらC面部(7)が形成されているので従来のC面加工の先端平面部(44)(444)に比べて面積が大きくとれ、超音波等での軸力測定が正確となる。The bolt head shown in FIG. 1 has a hexagonal shape (5), and the upper surface of the head has a hexagonal groove (3) in which the apex position is aligned with the outer hexagonal shape. Each corner has a slight R shape for the die life. The hexagonal groove bottom surface angle is preferably within the range of −30 ° (Xa) to + 30 ° (Xb) to the top surface of the head with respect to the shaft portion, preferably + 1 ° to + 2 °, and the inside is deepened and the outside is shallowed. Reflection noise at the time of ultrasonic axial force measurement is reduced, and the diagonal tension (8) of the hexagonal head is improved. The hexagonal groove depth (Yb) is within ½ of the head height, preferably about 8. The inside of the hexagonal groove inside the bolt upper surface is formed with a polygonal or circular, preferably circular flat surface portion (6), and the diameter of the flat surface portion (6) is 1/2 of the hexagonal outer surface width. The range is 5 to 4/5, preferably about 1/2. The height of the hexagonal exterior (5) on the upper surface of the bolt and the hexagonal groove inner flat surface portion (6) are the same or preferably the hexagonal groove inner flat surface portion (6) is slightly higher. In the cold forging machine, the bolt is preferably processed in a two-stage process, and at the same time, a shaft plane and a cut plane portion (4a) at the tip are formed. The cut plane part has a parallelism with the head plane part of 0.1 mm or less and an average roughness Rz of 12.5 or less. After that, by rolling the shaft part (2) and the vertical cut plane (4a) perpendicular to the tip part, while screwing the shaft part (2), the plane part (4b) remains at the maximum inside the tip part and the outside is extended. However, since the C surface portion (7) is formed, the area can be made larger than that of the tip flat surface portions (44) and (444) of conventional C surface processing, and the axial force measurement using ultrasonic waves or the like becomes accurate.
本発明は図面に示した態様に限定されることなく、本発明の範囲を逸脱しない限り色々の変更を施すことができる。例えば、本発明の一実施形態では6角形状ボルトだが、6〜12角の範囲で外部多角形状と内部溝多角形状が同じ頂点部位置なら多角形状ボルトでも良い。内部溝多角形状の各コーナー部においては型寿命のために若干のR形状としても良い。内部溝底面角度は超音波の反射波の誤動作を少なくするためなので、−30°〜+30°の範囲ならボルト形状(長さ・径等)に応じて最良な角度に変更しても良い。また頭部首下側にはつばやフランジがついているものでもついていなくてもよく、座金が組み込まれていてもいなくても良い。ボルト上面内部の6角溝の内側の平面部は溝外側が多角形状で内側は多角形状でも円形状でも良い。本発明ボルトの頭部でボルト端面部は平面でも転造加工で先端内部に平面部を最大限残したC面部を付けても良い。ボルト端面部に本発明の転造加工で先端内部に平面部を最大限残したC面部を付けた場合は、従来のC面加工の先端平面部に比べて面積が大きくとれ、超音波等での軸力測定が正確となるので、ボルト頭部は従来研磨ボルトや従来凹部冷間加工の平面部でも良い。The present invention is not limited to the embodiment shown in the drawings, and various modifications can be made without departing from the scope of the present invention. For example, although it is a hexagonal bolt in one embodiment of the present invention, a polygonal bolt may be used if the outer polygonal shape and the inner groove polygonal shape are in the same apex position within a range of 6 to 12 corners. Each corner portion of the inner groove polygonal shape may have a slight R shape for mold life. The inner groove bottom surface angle is used to reduce malfunction of the reflected wave of the ultrasonic wave. Therefore, the angle within the range of −30 ° to + 30 ° may be changed to the optimum angle according to the bolt shape (length, diameter, etc.). Also, the head neck side may or may not have a collar or flange, and a washer may or may not be incorporated. The flat surface inside the hexagonal groove inside the bolt upper surface may be polygonal on the outer side and polygonal or circular on the inner side. The bolt end face portion of the bolt head of the present invention may be flat or may be provided with a C surface portion that leaves the flat portion at the maximum inside the tip by rolling. When the C surface part that leaves the maximum flat part inside the tip by the rolling process of the present invention is attached to the bolt end surface part, the area can be made larger than the tip flat part of the conventional C surface processing, and ultrasonic waves, etc. Therefore, the bolt head may be a conventional polished bolt or a flat portion of a conventional recess cold work.
図1〜図6は本発明の一実施例を示すものである。
1 本発明ボルトの頭部
2 ねじ部
3 6角形状溝部
4a 先端転造加工前平面部
4b 転造加工端面平面部
5 6角形状外部
6 頭部6角形状溝内側平面部
7 先端転造加工C面部
8 頭部6角対角の張り部
11 従来研磨ボルトの頭部
22 ねじ部
44 研磨加工端面平面部
55 6角トリム形状外部
66 頭部研磨平面部
111 従来凹ボルトの冷間圧造加工頭部
222 ねじ部
444 冷間圧造加工端面平面部
555 6角リセス形状外部
666 6角リセス形状内部の平面部
Xa 多角溝底面の角度(軸部に対して頭部上面側に−30°以内)
Xb 多角溝底面の逆角度(軸部に対して頭部上面側に+30°以内)
9a ねじ部C面部同時転造加工ダイス固定側
9b ねじ部C面部同時転造加工ダイス移動側
Yc 6角形状溝部深さ
Ya Xa側6角形状溝部最大深さ
Yb Xb側6角形状溝部最大深さDESCRIPTION OF
Xb Reverse angle of the bottom of the polygonal groove (within + 30 ° on the top side of the head relative to the shaft)
9a Screw part C surface part simultaneous rolling process die fixing side 9b Screw part C surface part simultaneous rolling process die moving side Yc Hexagonal groove depth Ya Xa side hexagonal groove maximum depth Yb Xb side hexagonal groove maximum depth The
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112828235A (en) * | 2021-01-05 | 2021-05-25 | 富奥汽车零部件股份有限公司 | Forming process and forming system of inner multi-tooth bolt |
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JP2002113546A (en) * | 2000-01-14 | 2002-04-16 | Sugiura Seisakusho Co Ltd | Bolt and its manufacturing method |
JP2004205034A (en) * | 2002-11-08 | 2004-07-22 | Mtc:Kk | Head part, plastic working tool, and fastening tool |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112828235A (en) * | 2021-01-05 | 2021-05-25 | 富奥汽车零部件股份有限公司 | Forming process and forming system of inner multi-tooth bolt |
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