JP4031767B2 - Boss member manufacturing method - Google Patents

Boss member manufacturing method Download PDF

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JP4031767B2
JP4031767B2 JP2004092935A JP2004092935A JP4031767B2 JP 4031767 B2 JP4031767 B2 JP 4031767B2 JP 2004092935 A JP2004092935 A JP 2004092935A JP 2004092935 A JP2004092935 A JP 2004092935A JP 4031767 B2 JP4031767 B2 JP 4031767B2
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head
boss member
serration
outer periphery
shaft
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JP2005279651A (en
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一博 上羽
直樹 大田
達也 川上
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Nitto Seiko Co Ltd
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Nitto Seiko Co Ltd
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Description

本発明は、ワークに被締結物を取り付けるに際し、ワークと被締結物との間に介在させ、ねじで被締結物を固定するためのボス部材の製造において、この製造コストを低減可能にするボス部材の製造方法に関する。   The present invention provides a boss capable of reducing the manufacturing cost in manufacturing a boss member that is interposed between a workpiece and a workpiece and fixed with a screw when the workpiece is attached to the workpiece. The present invention relates to a method for manufacturing a member.

製品の薄型化のために電子基板を積層し、この前面にカバーや表示ユニットを取り付ける場合、これら被締結物を取り付けるワークは比較的薄いものが採用されている。このようなワークにカバーや表示ユニット等の被締結物を取り付けるに際しては通常、ねじが使用されているが、このねじを直接ワークに螺合するにはワークに十分な厚みがなく、固定強度の減少を招いていた。これを防止することからねじを螺合して取り付けるのに十分な強度を有するボス部材をワークに固定し、このボス部材にねじを螺合して被締結物を取り付けているのが現状である。   When an electronic board is laminated to reduce the thickness of a product and a cover or a display unit is attached to the front surface, a relatively thin work is used for attaching these objects to be fastened. A screw is usually used to attach an object to be fastened such as a cover or a display unit to such a workpiece. However, the thickness of the workpiece is not sufficient to screw this screw directly onto the workpiece, and the fixing strength is low. It was in decline. In order to prevent this, a boss member having sufficient strength for screwing and attaching a screw is fixed to a workpiece, and the object to be fastened is attached by screwing the screw to the boss member. .

このようなボス部材として、最近では多くの種類のものが使用されており、例えば、ワークに形成されている取付穴(図示せず)よりも若干径の大きい頭部とこの頭部に立設され前記穴部に嵌入し得る径となっている軸部とが金属材料で一体に形成されてなり、軸部の外周面には、頭部との境界部分に、全周にわたって断面四角形の溝部が形成されている。また、頭部の外周面には回り止め用のローレットあるいはセレーションが形成され、軸部にねじを螺合可能な有底円筒形状あるいは軸部から頭部にかけて貫通する貫通穴形状の下穴が形成されているものがある。そして、これを製造する場合は、最初に別工程で有底あるいは貫通円筒穴形状の下穴を有する素材を受け駒に軸部を挿入すると同時に加圧パンチで加圧して軸部より大径で所定の厚みの頭部を有する一次加工素材を形成する。   Recently, many types of boss members have been used. For example, a head having a slightly larger diameter than a mounting hole (not shown) formed in the workpiece and a erected on the head. And a shaft portion having a diameter that can be fitted into the hole portion is integrally formed of a metal material, and the outer peripheral surface of the shaft portion is a groove portion having a square cross-section over the entire circumference at the boundary portion with the head portion. Is formed. In addition, a knurl or serration for rotation prevention is formed on the outer peripheral surface of the head, and a bottomed cylindrical shape that can be screwed into the shaft portion or a through hole shaped pilot hole that penetrates from the shaft portion to the head portion is formed There is something that has been. And when manufacturing this, at first, the shaft part is inserted into the receiving piece with a bottomed or through-cylindrical hole-shaped material in a separate process, and at the same time, it is pressurized with a pressure punch and has a larger diameter than the shaft part. A primary processed material having a head with a predetermined thickness is formed.

次に、この一次加工素材を次工程のトリミング工程に移し、図7に示すように、この工程の受け駒131の支持穴132に軸部102を先にして挿入される。この後、一次加工素材111がトリミングパンチ141に向かってダイスピン133により押し出されてトリミングパンチ141との間で加圧され、図8に示すように、セレーション部107が頭部103の外周に形成されて、二次加工素材113が得られるようになっている。このような工程で二次加工素材113を製造した場合、頭部103のセレーション部107の軸部側にはかえり115が発生することから、首部の凹部は通常、切削加工により形成されてボス部材を製品化している。このように、ボス部材には切削により凹部を形成していることからその作業性が悪く、加工に時間がかかっているとともにこれの大量生産においてコストの低減に限界があり、この限界を解消してこれの生産効率を上げることが急務となっている。   Next, this primary work material is moved to the trimming process of the next process, and as shown in FIG. 7, the shaft portion 102 is inserted first into the support hole 132 of the receiving piece 131 of this process. Thereafter, the primary work material 111 is pushed out by the die spin 133 toward the trimming punch 141 and pressurized with the trimming punch 141, and the serration portion 107 is formed on the outer periphery of the head 103 as shown in FIG. Thus, the secondary processed material 113 is obtained. When the secondary work material 113 is manufactured in such a process, the burr 115 is generated on the shaft part side of the serration part 107 of the head 103. Therefore, the concave part of the neck part is usually formed by cutting and is a boss member. Is commercialized. As described above, since the boss member is formed with a recess by cutting, its workability is poor, and it takes time to process, and there is a limit to cost reduction in mass production of this, and this limit is solved. There is an urgent need to increase the production efficiency.

このことを解決するために最近では多段パーツホーマにより製造する方法が採用されつつある。これは、軸部202に外周軸線に沿い、係止突起207を四ヶ所に形成したものであり、材料の加圧直前の状態を示す図9のように、あらかじめダイス231の孔232の前に前工程により得られた材料を位置させてパンチ235をダイス側に移動させる。これにより、前記材料の端部がダイス231の孔232の底に到達し、このとき、突起形成用突状237の端部に対応する位置まで図10に示すように、前記材料の側部の一部が押し上げられて係止突起207が形成されるようになっている。この突起は軸部外周面から半径方向に所定量突出した形状となっており、これを樹脂製品にインサートすることによって軸方向及び回転方向への動きをなくするようになっている。そして、従来の切削による凹溝の形成に代えてこの多段パ−ツホーマでの圧造作業を利用して凹溝を形成することが可能となっている。
特許第3045397号公報
In order to solve this problem, a method of manufacturing by a multi-stage parts former is being adopted recently. This is because the locking projections 207 are formed at four locations along the outer peripheral axis of the shaft portion 202, and in front of the hole 232 of the die 231 in advance as shown in FIG. The material obtained by the previous process is positioned and the punch 235 is moved to the die side. As a result, the end of the material reaches the bottom of the hole 232 of the die 231, and at this time, as shown in FIG. 10, the side of the side of the material reaches the position corresponding to the end of the protrusion forming protrusion 237. A part of the locking projection 207 is formed by being pushed up. This protrusion has a shape protruding from the outer peripheral surface of the shaft portion by a predetermined amount in the radial direction, and is inserted into a resin product to eliminate movement in the axial direction and the rotational direction. And it can replace with formation of the ditch | groove by the conventional cutting, and can form a ditch | groove using the forging work in this multistage part forma.
Japanese Patent No. 3045397

しかしながら、切削で前記凹部を形成するようにした場合、最初に圧造作業でセレーション部を形成した二次加工素材を製造してからそれらに二次加工としての切削作業を一本宛施さねばならず、このため、コストの低減が不可能となっていた。また、これを解消するために多段パーツホーマにより行うことも可能であるが、この機械が高価であることから、かなり大量のボス部材を製造せねばならず、最近の多種少量生産においてはその製造原価が必然的に高価になり、機械の採算性も悪いので、これの導入に支障を来している。一方、このようなボス部材に対するコストの引き下げ要求も増加する傾向から、早急にこれを解決する必要がある等の課題が生じている。   However, when the concave portion is formed by cutting, the secondary work material in which the serration part is formed by the forging work must be manufactured first, and then the cutting work as the secondary work must be applied to one of them. For this reason, it has been impossible to reduce the cost. In order to solve this problem, it is possible to use a multi-stage part former. However, since this machine is expensive, a large amount of boss members must be manufactured. However, it is inevitably expensive, and the profitability of the machine is bad, which hinders the introduction of this. On the other hand, since the demand for reducing the cost of such boss members also increases, there is a problem that it is necessary to solve this problem immediately.

本発明の目的は、このような課題を解消するとともにボス部材を圧造加工と転造加工を用いた塑性加工により製造可能としたボス部材の製造方法を得ることである。   The objective of this invention is obtaining the manufacturing method of the boss member which made it possible to manufacture such a subject by plastic working using a forging process and a rolling process while eliminating such a subject.

本発明の目的は、軸部2の中心線上にねじを螺合する下穴4を有し、一端に軸部2より大径のセレーション部7を有する頭部3と、この頭部3と軸部2との間の首部外周に溝形状の凹部5を設けてなるボス部材の製造において、素材10を頭部圧造工程30により圧造加工して頭部3の座面側外周に前記セレーション部7を形成するとともに頭部3の端面側に前記セレーション部7より大径でこれより厚みの薄い余肉部12を形成して一次加工素材11を得、次に次工程のトリミング工程40において、前記一次加工素材11の余肉部12にトリミングパンチ41を前記セレーション部7の外周形状に一致するように配置してこの一次加工素材11をトリミングパンチ側へ押し出して頭部外周全体にセレーション部7を有する二次加工素材13を形成し、更に、ローリング工程50において、この二次加工素材13の首部の外周に前記凹部5を転造加工により形成してボス部材1を得るようにしたボス部材の製造方法を提供することで達成される。   An object of the present invention is to provide a head 3 having a pilot hole 4 into which a screw is screwed onto the center line of the shaft portion 2 and having a serration portion 7 having a diameter larger than that of the shaft portion 2 at one end, and the head 3 and the shaft. In the manufacture of a boss member in which a groove-shaped recess 5 is provided on the outer periphery of the neck between the portion 2, the serration portion 7 is formed on the outer periphery of the head 3 by forging the material 10 by a head forging step 30. And forming a surplus portion 12 having a diameter larger than that of the serration portion 7 and thinner than the serration portion 7 on the end surface side of the head portion 3 to obtain a primary work material 11, and then in the trimming step 40 of the next step, The trimming punch 41 is arranged in the surplus portion 12 of the primary processed material 11 so as to match the outer peripheral shape of the serration portion 7 and the primary processed material 11 is pushed out to the trimming punch side so that the serration portion 7 is placed on the entire outer periphery of the head. Secondary processing material 1 Furthermore, in the rolling process 50, the manufacturing method of the boss member which obtained the boss member 1 by forming the said recessed part 5 by the rolling process in the outer periphery of the neck part of this secondary processed material 13 is provided. To be achieved.

また、この目的の達成ために前記構成に加えて、セレーション部は中心から放射方向に且つ円周上等間隔をおいて山形形状の複数の突部が突出した形状となっており、更に、これらの構成に加えて、凹部は軸線に沿う断面において底面側が狭く開放側が広くなるように少なくとも一方が傾斜した側壁6を有している。   In order to achieve this object, in addition to the above-described configuration, the serration portion has a shape in which a plurality of chevron-shaped protrusions protrude radially from the center and at equal intervals on the circumference. In addition to the above structure, the concave portion has a side wall 6 inclined at least one so that the bottom surface side is narrow and the open side is wide in the cross section along the axis.

本発明によれば、圧造成形した後、二次加工としての切削加工が不要になるので、自動化が容易になり、より多くの製造コストの低減が可能になるとともに形状誤差も殆ど発生しない。また、高価な製造機械としての多段パーツホーマを使用する必要がないので、これによりボス部材を製造する場合に比べてその製造原価を低減することができる。更に、本発明によりボス部材を製造した場合、製造コストが低減されるので、コストの引き下げ要求に対しても十分に対応することができ、しかも、最近需要が多い多種少量生産への対応も容易になる等の特有の効果がある。   According to the present invention, after the forging and forming, the cutting process as the secondary process becomes unnecessary, so that automation is facilitated, more manufacturing costs can be reduced, and almost no shape error occurs. Moreover, since it is not necessary to use a multistage part former as an expensive manufacturing machine, the manufacturing cost can be reduced as compared with the case where the boss member is manufactured. Further, when the boss member is manufactured according to the present invention, the manufacturing cost is reduced, so that it is possible to sufficiently respond to the cost reduction request, and it is also easy to cope with the large-scale and small-volume production that has recently been in great demand. There are special effects such as becoming.

以下、本発明の実施の形態を図1乃至図6に基づき説明する。図5及び図6において、1は本発明により製造されるボス部材であり、軸部2とこの軸部2より大径の頭部3とから構成されている。このボス部材1の軸部2には中心線上に有底円筒穴形状に明けられた下穴4が設けられている。この下穴4は軸部2の軸端から頭部3に向かって有底円筒穴形状に形成されているが、この他に軸端から頭部端にかけて貫通した貫通穴形状(図示せず)であってもよい。この下穴4にはねじ(図示せず)が螺合されて組み合わされるようになっているので、この径はねじの脚部に形成されるねじ山の有効径とほぼ同径かそれ以下となっている。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 and 6, reference numeral 1 denotes a boss member manufactured according to the present invention, which includes a shaft portion 2 and a head portion 3 having a diameter larger than that of the shaft portion 2. The shaft portion 2 of the boss member 1 is provided with a prepared hole 4 formed in the shape of a bottomed cylindrical hole on the center line. The pilot hole 4 is formed in a bottomed cylindrical hole shape from the shaft end of the shaft portion 2 toward the head portion 3, but in addition to this, a through-hole shape penetrating from the shaft end to the head end (not shown) It may be. Since a screw (not shown) is screwed into the pilot hole 4 and combined, this diameter is substantially equal to or less than the effective diameter of the thread formed on the screw leg. It has become.

また、この軸部2と頭部3との間の首部には軸部2より小径で頭部3の厚さの約1/2程度の幅を有するとともに軸部外周に沿う外周溝形状の凹部5が形成してあり、この凹部5は軸線に沿う断面において、底面側が狭く開放側が広くなるよう少なくとも一方が、あるいは両側が傾斜した側壁6を有している。この凹部5は金属板等のワーク(図示せず)の取付穴(図示せず)にボス部材1が加圧入固定された時、ワークの肉が嵌り込む溝であり、これにより、ワークに対して抜け止め構造となっている。   In addition, the neck between the shaft 2 and the head 3 has a smaller diameter than the shaft 2 and a width of about ½ of the thickness of the head 3 and is an outer circumferential groove-shaped recess along the outer periphery of the shaft. The recess 5 has a side wall 6 inclined at least one or both sides so that the bottom side is narrow and the open side is wide in the cross section along the axis. The recess 5 is a groove into which the meat of the work fits when the boss member 1 is press-fitted and fixed in a mounting hole (not shown) of a work (not shown) such as a metal plate. And has a retaining structure.

この首部には軸部2の直径より大径の前記頭部3が連続して一体的に設けてあり、この頭部3にはその中心から放射方向に且つ円周上に等間隔をおいて山形形状の複数の突部が突出した形状のセレーション部7が形成されている。このセレーション部7は外周を鋸歯状の山形形状としているが、この形状に限定されるものではなく、ワークに加圧固定されたときに回り止め作用が生じる構造であれば、例えば、花びら形状であってもよい。   The head portion 3 having a diameter larger than the diameter of the shaft portion 2 is continuously and integrally provided on the neck portion, and the head portion 3 is radially spaced from the center thereof at equal intervals on the circumference. A serration portion 7 having a shape in which a plurality of chevron-shaped protrusions protrudes is formed. The serration portion 7 has a serrated chevron shape on the outer periphery, but is not limited to this shape. For example, the serration portion 7 may have a petal shape as long as it has a detent action when being pressed and fixed to a workpiece. There may be.

次にこのボス部材1の製造方法について図1乃至図4により説明すると、あらかじめ所定寸法に設定された素材10に対して、図1に示すように、所定の下穴4が穴明け工程20で形成される。この穴明け工程20に続いて、頭部圧造工程30が配置してあり、この工程により図2に示すように、圧造加工が加えられて頭部3には一次加工素材11の軸部側外周にセレーション部7が形成される。この工程の受け駒31はボス部材1の軸部外径に相当する支持穴32を有しており、この支持穴32には押出ピン33が軸方向に摺動自在に内挿されている。この支持穴32の先端にはこれより大きい外径で前記ボス部材1の頭部外周に形成されるセレーション部7に対応する山形形状の成形穴34が形成してあり、この深さは前記ボス部材1の頭部3の厚みより僅かに浅くなっている。 Next, the manufacturing method of the boss member 1 will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, a predetermined pilot hole 4 is formed in a drilling step 20 with respect to a material 10 set to a predetermined dimension in advance. It is formed. Following this drilling step 20, a head forging step 30 is arranged, and as shown in FIG. 2, forging is applied and the head 3 has an outer periphery on the shaft portion side of the primary work material 11. The serration portion 7 is formed. The receiving piece 31 in this step has a support hole 32 corresponding to the outer diameter of the shaft portion of the boss member 1, and an extrusion pin 33 is inserted into the support hole 32 so as to be slidable in the axial direction. A chevron-shaped molding hole 34 corresponding to the serration portion 7 formed on the outer periphery of the head of the boss member 1 is formed at the tip of the support hole 32 and has a larger outer diameter. It is slightly shallower than the thickness of the head 3 of the member 1.

一方、支持穴32の中心線上には加圧パンチ35が配置してあり、この加圧パンチ35の先端には前記ボス部材1の頭部端面側に前記セレーション部7の外径より大径で前記成形穴34で形成されるセレーション部7より薄い余肉部12を形成する余肉形成穴36を有している。この穴36の深さは前記ボス部材1の頭部3の厚みから前記成形穴34の深さを引いた寸法になっており、これら両方の穴34、36の深さを合わせたものが前記頭部の厚みとなるように設定されている。   On the other hand, a pressure punch 35 is disposed on the center line of the support hole 32, and the tip of the pressure punch 35 has a diameter larger than the outer diameter of the serration portion 7 on the head end surface side of the boss member 1. It has a surplus hole forming hole 36 for forming a surplus part 12 thinner than the serration part 7 formed by the forming hole 34. The depth of the hole 36 is a dimension obtained by subtracting the depth of the molding hole 34 from the thickness of the head 3 of the boss member 1, and the sum of the depths of both the holes 34 and 36 is the above-mentioned. It is set to be the thickness of the head.

この頭部圧造工程30に続いて、トリミング工程40が配置されている。このトリミング工程40では図3に示すように、前記受け駒31の支持穴32の中心線上にトリミングパンチ41が移動して位置するようになっており、この移動により互いの中心が一致し、前記工程により得られた一次加工素材11の頭部3の余肉部端面に当接するようになっている。このトリミング工程40ではあらかじめ前記頭部圧造工程30により形成されているセレーション部7の外周形状とトリミングパンチ41の内形状が一致するように調整配置してあり、押出ピン33が前方のトリミングパンチ側へ移動して一次加工素材11を押し出して前記余肉部12にトリミングパンチ41が食い込むことで、頭部3の外周面全体には図4に示すように、セレーション部7が形成された二次加工素材13が得られるようになっている。   Subsequent to the head forging process 30, a trimming process 40 is arranged. In the trimming step 40, as shown in FIG. 3, the trimming punch 41 is moved and positioned on the center line of the support hole 32 of the receiving piece 31. It contacts the surplus part end surface of the head 3 of the primary work material 11 obtained by the process. In this trimming process 40, the outer peripheral shape of the serration portion 7 formed in advance by the head forging process 30 and the inner shape of the trimming punch 41 are adjusted and arranged, and the push pin 33 is arranged on the front trimming punch side. As shown in FIG. 4, the secondary part in which the serration part 7 is formed on the entire outer peripheral surface of the head 3 is obtained by pushing the primary processed material 11 and pushing the trimming punch 41 into the surplus part 12. A processed material 13 is obtained.

次にはローリング工程50が設けてあり、この工程では前記セレーション部7を有する二次素材13が頭部3を上にして転造ダイス(図示せず)により頭部3と軸部2との間の首部を転造加工することで首部の外周には凹部5が形成されるようになっている。これにより、軸部2の外周に環状の凹部5が形成されたボス部材1が得られる構成である。   Next, a rolling process 50 is provided. In this process, the secondary material 13 having the serration part 7 is placed between the head 3 and the shaft part 2 by a rolling die (not shown) with the head 3 facing up. A concave portion 5 is formed on the outer periphery of the neck portion by rolling the neck portion in between. Thereby, the boss member 1 in which the annular recess 5 is formed on the outer periphery of the shaft portion 2 is obtained.

このような構成において、あらかじめ軸部2より大きい頭部3が得られるような所定長さ寸法に設定された素材10に対して穴明け工程20で下穴4をあけ、この素材10を頭部圧造工程30に供給する。この頭部圧造工程30では図2に示されたように、受け駒31の支持穴32に素材10が加圧パンチ35で圧入されると同時にこの素材10の挿入先端が所定位置にある押出ピン33の端部に当接するが、更に加圧パンチ35が移動するので、素材10が成形穴34に充満する。一方、加圧パンチ側の素材10も余肉形成穴36に充満することになり、この加圧作用により軸部側にセレーション部7を有し、頭部端部に厚みの薄い余肉部12を有する頭部3が形成された一次加工素材11が得られる。この一次加工素材11が得られると、加圧パンチ35は後退し、続いて、この受け駒31の中心線上にトリミングパンチ41が移動して位置決めされる。   In such a configuration, a pilot hole 4 is drilled in a drilling step 20 in a material 10 set to a predetermined length so that a head 3 larger than the shaft portion 2 can be obtained in advance, and the material 10 is removed from the head 10. Supply to the forging process 30. In the head forging step 30, as shown in FIG. 2, the material 10 is press-fitted into the support hole 32 of the receiving piece 31 by the pressure punch 35, and at the same time, the extrusion pin having the insertion tip of the material 10 in a predetermined position. Although it contacts the end of 33, the pressure punch 35 moves further, so that the material 10 fills the forming hole 34. On the other hand, the material 10 on the pressure punch side is also filled in the surplus hole forming hole 36, and this pressurizing action has the serration portion 7 on the shaft portion side and the surplus portion 12 having a small thickness at the head end. The primary processed material 11 in which the head 3 having the shape is formed is obtained. When the primary work material 11 is obtained, the pressure punch 35 moves backward, and then the trimming punch 41 is moved and positioned on the center line of the receiving piece 31.

このトリミング工程40においては、あらかじめトリミングパンチ41の内形状が受け駒の成形穴形状と一致しており、図3に示すように、トリミングパンチ41が受け駒側へ移動して前記一次加工素材11の余肉部12に当接すると、前記押出ピン33がトリミングパンチ41の方向へ移動し、この一次加工素材11を受け駒31の支持穴32から押し出す。これにより、図4に示すように、余肉部12には外周の抜きカス14が除かれてトリミングパンチ41で前記セレーション部7と同様の形状が形成される。このようにして、頭部3の全外周にセレーション部7が形成された二次加工素材13は次にローリング工程50に供給される。   In this trimming step 40, the inner shape of the trimming punch 41 matches the shape of the receiving hole forming hole in advance, and the trimming punch 41 moves to the receiving piece side as shown in FIG. When abutting against the surplus portion 12, the push pin 33 moves in the direction of the trimming punch 41 and pushes out the primary work material 11 from the support hole 32 of the piece 31. As a result, as shown in FIG. 4, the blank portion 14 on the outer periphery is removed from the surplus portion 12, and the trim punch 41 forms the same shape as the serration portion 7. In this way, the secondary processed material 13 having the serrations 7 formed on the entire outer periphery of the head 3 is then supplied to the rolling process 50.

このローリング工程50では、セレーション部7を有する頭部3を上に軸部2を垂下した状態で転造ダイス(図示せず)間に供給され、二次加工素材13には頭部座面側の軸部2に凹部5が転造加工により形成される。以上により図5及び図6に示すようなボス部材1が完成する。   In this rolling process 50, the head 3 having the serration portion 7 is supplied between the rolling dies (not shown) with the shaft portion 2 hanging down, and the secondary work material 13 has a head seat surface side. A recess 5 is formed on the shaft portion 2 by rolling. Thus, the boss member 1 as shown in FIGS. 5 and 6 is completed.

本発明を示すフロー図である。It is a flowchart which shows this invention. 頭部圧造工程の要部断面図である。It is principal part sectional drawing of a head forging process. トリミング工程の要部断面図である。It is principal part sectional drawing of a trimming process. セレーション部が形成された状態を示す要部断面図である。It is principal part sectional drawing which shows the state in which the serration part was formed. ボス部材の要部断面図である。It is principal part sectional drawing of a boss | hub member. 図5の右側面図である。FIG. 6 is a right side view of FIG. 5. 本発明の従来例を示す要部断面図である。It is principal part sectional drawing which shows the prior art example of this invention. 図7の従来例で形成されたセレーション部を示す要部断面図である。It is principal part sectional drawing which shows the serration part formed in the prior art example of FIG. 他の従来例を示す要部断面図である。It is principal part sectional drawing which shows another prior art example. 他の従来例を示す要部断面図である。It is principal part sectional drawing which shows another prior art example.

符号の説明Explanation of symbols

1 ボス部材
2 軸部
3 頭部
4 下穴
5 凹部
6 側壁
7 セレーション部
10 素材
11 一次加工素材
12 余肉部
13 二次加工素材
14 抜きカス
20 穴明け工程
30 頭部圧造工程
31 受け駒
32 支持穴
33 押出ピン
34 成形穴
35 加圧パンチ
36 余肉形成穴
40 トリミング工程
41 トリミングパンチ
50 ローリング工程
DESCRIPTION OF SYMBOLS 1 Boss member 2 Shaft part 3 Head part 4 Pilot hole 5 Recessed part 6 Side wall 7 Serration part 10 Material 11 Primary processing material 12 Remaining part 13 Secondary processing material 14 Dregs 20 Drilling process 30 Head forging process 31 Receiving piece 32 Support hole 33 Extrusion pin 34 Molding hole 35 Pressure punch 36 Remaining hole forming hole 40 Trimming process 41 Trimming punch 50 Rolling process

Claims (3)

軸部(2)の中心線上にねじを螺合する下穴(4)を有し、一端に軸部より大径のセレーション部(7)を有する頭部(3)と、この頭部と軸部との間の首部外周に溝形状の凹部(5)を設けてなるボス部材の製造において、素材(10)を頭部圧造工程(30)により圧造加工して頭部の座面側外周に前記セレーション部を形成するとともに頭部の端面側に前記セレーション部より大径でこれより厚みの薄い余肉部(12)を形成して一次加工素材(11)を得、次に次工程のトリミング工程(40)において、前記一次加工素材の余肉部にトリミングパンチ(41)を前記セレーション部の外周形状に一致するように配置してこの一次加工素材をトリミングパンチ側へ押し出して頭部外周全体にセレーション部を有する二次加工素材(13)を形成し、更に、ローリング工程(50)において、この二次加工素材の首部の外周に前記凹部を転造加工により形成してボス部材(1)を得るようにしたことを特徴とするボス部材の製造方法。   A head (3) having a pilot hole (4) for screwing a screw on the center line of the shaft (2) and having a serration portion (7) having a diameter larger than that of the shaft at one end, and the head and the shaft In the manufacture of a boss member in which a groove-shaped recess (5) is provided on the outer periphery of the neck between the head and the material, the material (10) is forged by the head forging step (30) to the outer periphery of the head on the seat surface side. Forming the serration portion and forming a surplus portion (12) having a diameter larger than the serration portion and thinner than the serration portion on the end surface side of the head to obtain a primary processed material (11), and then trimming in the next step In the step (40), the trimming punch (41) is arranged in the surplus portion of the primary processed material so as to coincide with the outer peripheral shape of the serration portion, and the primary processed material is pushed out to the trimming punch side so that the entire outer periphery of the head Secondary processed material (1 And in the rolling step (50), the concave portion is formed by rolling on the outer periphery of the neck of the secondary processed material to obtain a boss member (1). Manufacturing method of member. セレーション部は中心から放射方向に且つ円周上等間隔をおいて山形形状の複数の突部が突出した形状であることを特徴とする請求項1記載のボス部材の製造方法。   2. The method for manufacturing a boss member according to claim 1, wherein the serration portion has a shape in which a plurality of mountain-shaped protrusions protrude radially from the center and at equal intervals on the circumference. 凹部は軸線に沿う断面において底面側が狭く開放側が広くなるように少なくとも一方が傾斜した側壁(6)を有していることを特徴とする請求項1又は2記載のボス部材の製造方法。   The method for producing a boss member according to claim 1 or 2, wherein the recess has a side wall (6) inclined at least one side so that the bottom surface side is narrow and the open side is wide in a cross section along the axis.
JP2004092935A 2004-03-26 2004-03-26 Boss member manufacturing method Expired - Fee Related JP4031767B2 (en)

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