JP2006007285A - Method for producing boss member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method for producing a boss member by which the boss member having a desirable function can be produced at a low cost. <P>SOLUTION: In an aluminum alloy heat-treated material beforehand performing the heat treatment to a blank 10 and having a prescribed hardness, in the production of the boss member arranging a head part 3 having a larger diameter serration part 6 than a shaft part 2 at the one end part and a recessed part 5 between the head part 3 and the shaft part 2, cold-pressing is performed to this material to obtain a primary working blank 11 having the shaft part 2 forming the head part 2 and a screwing part screwed with fastening member. In a rolling process 40, since the producing method for boss member 1, obtaining the boss member 1 by forming the above recessed part 5 on the outer periphery of the neck part in the blank 11, the heat treatment is not needed to apply after working the blank and therefore, the working manhour can be saved and the cost is reduced. Further, since the boss member is made of the aluminum alloy heat-treating material and the work is made of the aluminum, too, in the case of recycling these parts, selection treatment is not needed and the recycle as it is can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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.

製品の軽量化及び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軽量化を目的としてアルミニウム合金が採用され、しかも、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 electronic boards are stacked to reduce the weight and thickness of products, and a cover and display unit are attached to the front surface, the work to which these objects are attached is made of aluminum alloy for the purpose of weight reduction, and relatively Thin one is adopted. 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取付穴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、軸部には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、最初に素材１１０に別工程で有底あるいは貫通円筒穴形状の下穴を形成し、この後、図７に示す頭部圧造工程１３０において、前記素材１１０を受け駒に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且つセレーション部が形成された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 mounting hole 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. Further, a knurl or serration for preventing rotation is formed on the outer peripheral surface of the head, and a bottomed cylindrical shape in which a screw can be screwed or a through hole shaped pilot hole penetrating from the shaft to the head is formed on the shaft. Some are formed. When manufacturing this, first, a prepared hole with a bottomed or through-cylindrical hole shape is formed in the material 110 in a separate process, and then the material 110 is received in the head forging process 130 shown in FIG. At the same time as being inserted into the piece, it is pressed by a pressure punch to form a primary work material having a head having a predetermined diameter and a diameter larger than that of the shaft portion and a serration portion.

次に、この一次加工素材を次工程の溝加工工程１４０に移し、図８に示すように、頭部１０３と軸部１０２との間の首部に環状の溝部１０５が形成されるようになっている。この溝加工は通常、切削加工により行われているが、最近では一部に圧造加工により行われているものも出てきている。このようにして、首部に環状の溝部１０５が形成された二次加工素材が得られると、次にこれを固定するワークより硬度を高くする必要から製品としての所定の硬度を得るために熱処理工程１５０に移され、この工程において二次加工素材に所定硬度を与えてボス部材１０１を得ているのが現状である。
登録意匠第８９５７２５号公報 Next, the primary processed material is transferred to the next groove processing step 140, and an annular groove 105 is formed at the neck between the head 103 and the shaft 102 as shown in FIG. Yes. This grooving is usually performed by cutting, but recently, some grooving has been performed by forging. In this way, when a secondary processed material having an annular groove 105 formed in the neck is obtained, a heat treatment step is performed in order to obtain a predetermined hardness as a product since it is necessary to increase the hardness of the workpiece next to fix the workpiece. At present, the boss member 101 is obtained by giving a predetermined hardness to the secondary work material in this step.
Registered Design No. 895725

しかしながら、このように、素材に様々な加工を加えて二次加工素材を得てから、これに所定硬度が得られるように熱処理を施す場合、必然的に製品化までの製造工数が多くかかり、コストが上昇しており、製品の単価が低減できなかった。また、ユーザからの供給コストの低減が求められる中で、様々なコスト低減策が講じられているが、機械の高速化による対応だけでは、限界があり、大きな成果が得られていない。特に、ボス部材が大きいと、軸部の締結部にはあらかじめねじあるいはナットを螺合するための雌ねじあるいは雄ねじを形成する必要があるが、これら雌ねじあるいは雄ねじを形成するための二次加工が必要となり、そのため、この加工工程を熱処理するまでに設けねばならないが、この雌ねじあるいは雄ねじを形成する場合、切削加工により行っており、その時間当たりの製造数量に限度があり、短時間に纏まった数量が得られていない。このため、熱処理に要する適正な数量が必要な時間に得られず、適正数量になるまで処理ができず、納期の遅延を招いている。一方、少ない量でも処理はできるが、熱処理に必要なガスの量を少なくすることができず、熱処理費用が高価になる等の課題が生じている。   However, in this way, after applying various processing to the material to obtain a secondary processed material and then performing heat treatment so that a predetermined hardness can be obtained, it inevitably takes a lot of manufacturing man-hours until commercialization, The cost has risen and the unit price of the product could not be reduced. In addition, various cost reduction measures have been taken in the midst of demand for reduction of supply costs from users, but there is a limit only by the response by speeding up the machine, and a great result has not been obtained. In particular, when the boss member is large, it is necessary to form a female screw or a male screw for screwing a screw or a nut in advance in the fastening portion of the shaft portion, but secondary processing for forming these female screw or male screw is necessary. Therefore, this processing step must be provided before heat treatment, but when forming this internal thread or external thread, it is done by cutting, and there is a limit to the production quantity per hour, and the quantity collected in a short time Is not obtained. For this reason, an appropriate quantity required for the heat treatment cannot be obtained at a required time, and the process cannot be performed until the appropriate quantity is reached, resulting in a delay in delivery date. On the other hand, processing can be performed with a small amount, but the amount of gas necessary for heat treatment cannot be reduced, and there are problems such as high heat treatment costs.

本発明の目的は、このような課題を解消するとともに所望の機能を有するボス部材を安価且つ短時間に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 the boss member which eliminates such a subject and has a desired function cheaply in a short time.

本発明の目的は、一端に軸部２より大径のセレーション部６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はあらかじめ熱処理され且つ所定硬度を有するアルミニウム合金熱処理材であって、これに圧造加工を行い、セレーション部６を有する頭部３と締結部材が螺合される螺合部を形成した軸部２とを有する一次加工素材１１を得、次に次工程のローリング工程４０において、前記一次加工素材１１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 serration portion 6 having a diameter larger than that of the shaft portion 2 at one end, and a groove-shaped recess 5 provided on the outer periphery of the neck between the head portion 3 and the shaft portion 2. In manufacturing the member, the material 10 is a heat-treated aluminum alloy heat-treated material having a predetermined hardness, and is subjected to a forging process so that the head portion 3 having the serration portion 6 and the fastening member are screwed together. The first processed material 11 having the shaft portion 2 formed with the boss member 1 is obtained by forming the concave portion 5 on the outer periphery of the neck portion of the primary processed material 11 by rolling in the next rolling step 40. This is achieved by providing a method for manufacturing a boss member that achieves the above.

また、この構成において、アルミ合金熱処理材はその硬度が少なくともＨＶ１００以上とすることで、アルミニウム製のワークに対してこれを圧入固定する際にこれが変形することなく確実に固定できる。   Moreover, in this structure, when the hardness of the aluminum alloy heat-treated material is at least HV100 or more, when it is press-fitted and fixed to an aluminum workpiece, it can be reliably fixed without being deformed.

本発明によれば、あらかじめワークの硬度より高い所定硬度を有するように熱処理された素材を使用してボス部材を圧造成形しているので、素材の加工後に熱処理を加える必要がなく、そのため、加工工数が削減できコストが低減される。また、圧造加工速度を高速化する場合に比べて、簡単にコスト低減が図れることからこのコスト低減に要する費用が少なくなり、ユーザの要求にも迅速に対応できる。特に、比較的大きいボス部材の製造においては、雌ねじあるいは雄ねじを軸部に形成する工程があれば、これの製品化が可能になるので、小ロットづつのユーザへの供給も可能になり、ユーザにおける在庫が減少する。しかも、このボス部材はアルミニウム合金熱処理材製で、ワークもアルミニウム製であるので、これら部品を再生する場合に分別処理する必要がなく、そのまま再生することができる。その上、ワークと異なる材料で製造されたボス部材を使用したものに比べて資源の有効活用が向上するとともに再生コストの低減を図ることができ、環境問題解消の一助となる。   According to the present invention, since the boss member is formed by forging using a material that has been heat-treated in advance to have a predetermined hardness higher than the hardness of the workpiece, there is no need to add heat treatment after the material is processed. Man-hours can be reduced and costs can be reduced. In addition, since the cost can be easily reduced as compared with the case where the forging processing speed is increased, the cost required for the cost reduction is reduced, and the user's request can be quickly responded. In particular, in the manufacture of a relatively large boss member, if there is a process of forming a female screw or a male screw on the shaft part, it becomes possible to commercialize this, so that it is possible to supply users in small lots. Inventory in Moreover, since this boss member is made of an aluminum alloy heat treatment material and the workpiece is also made of aluminum, it is not necessary to perform a separation process when these parts are regenerated, and they can be regenerated as they are. In addition, resources can be used more effectively than the one using a boss member made of a material different from that of the workpiece, and the regeneration cost can be reduced, which helps to solve environmental problems.

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、材料があらかじめ熱処理されて所定硬度を有するアルミニウム合金熱処理材製のボス部材であり、この硬度は通常、少なくともＨＶ１００以上となるように処理されている。しかも、このボス部材１はその加工において、生じる加工硬化により、製品となった段階でその硬度が１割程度増加しており、このボス部材１は軸部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は締結部材であるねじ（図示せず）が螺合されて組み合わされる螺合部となっているので、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 made of an aluminum alloy heat-treated material, which is manufactured according to the present invention and is heat-treated in advance and has a predetermined hardness, and the hardness is usually at least HV100 or more. Has been. Moreover, the hardness of the boss member 1 is increased by about 10% at the stage of becoming a product due to the work hardening that occurs in the processing, and the boss member 1 has a larger diameter than the shaft portion 2 and the shaft portion 2. The head 3 is constituted. 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 this pilot hole 4 is a screwed portion in which a screw (not shown), which is a fastening member, is screwed together, this diameter is substantially the same as the effective diameter of the thread formed on the screw leg portion. Diameter or less.

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ている。この凹部５はアルミニウム板等のワーク（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。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６が形成されている。このセレーション部６は外周を鋸歯状の山形形状としているが、この形状以外に、例えば、花びら形状であってもよい。   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. 5 is formed, and in the cross section along the axis, at least one or both sides are inclined so that the bottom surface side is narrow and the open side is wide. The recess 5 is a groove into which the meat of the work is fitted when the boss member 1 is press-fitted and fixed in a mounting hole (not shown) of a work (not shown) such as an aluminum plate. And has a retaining structure. 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 6 having a shape in which a plurality of mountain-shaped protrusions protrudes is formed. The serration portion 6 has a serrated chevron shape on the outer periphery, but may have, for example, a petal shape other than this shape.

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、所定寸法に設定され且つ材料が、あらかじめ熱処理されて所定硬度を有するアルミニウム合金熱処理材製の素材１０即ち、この実施の形態では、硬度は少なくとも１００ＨＶ以上となるように設定されている素材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６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６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. The material 10 made of an aluminum alloy heat treatment material, which is set to a predetermined size and the material is preheated and has a predetermined hardness, that is, this embodiment. Then, as shown in FIG. 1, a predetermined pilot hole 4 is formed in the drilling step 20 for the material 10 set to have a hardness of at least 100 HV or more. 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 6 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 6 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６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６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 6 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 6 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には前記余肉部１２を除去してセレーション部６を形成するトリミング作業が含まれており、これは図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３７が移動して位置するようになっている。このトリミング作業ではセレーション部６の外周形状とトリミングパンチ３７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３７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６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。この作業は次工程で凹部５を形成するために素材を水平に支えるのに必要な頭部座面をできる限り平坦にすることを目的として必要な作業である。   The head forging step 30 includes a trimming operation for removing the surplus portion 12 to form the serration portion 6, which is the center of the support hole 32 of the receiving piece 31 as shown in FIG. The trimming punch 37 is moved and positioned on the line. In this trimming operation, the outer peripheral shape of the serration portion 6 and the inner shape of the trimming punch 37 are adjusted and arranged, and the extrusion pin 33 moves to the front trimming punch side to push out the primary work material 11 and to remove the surplus. When the trimming punch 37 bites into the meat portion 12, the secondary processed material 13 having the serration portion 6 formed on the entire outer peripheral surface of the head 3 is obtained as shown in FIG. This operation is necessary for the purpose of making the head seating surface necessary for supporting the material horizontally in order to form the recess 5 in the next process as flat as possible.

次にはローリング工程４０が配置してあり、この工程では前記セレーション部６を有する二次加工素材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。これら圧造加工により素材が塑性変形され、素材の表面には加工硬化が生じることになる。   Next, a rolling process 40 is arranged, and in this process, the secondary work material 13 having the serration part 6 is placed on the head 3 with the head 3 and the shaft part 2 by a rolling die (not shown). A recess 5 is formed on the outer periphery of the neck by rolling the neck between the two. Thereby, the boss member 1 in which the annular recess 5 is formed on the outer periphery of the shaft portion 2 is obtained. The material is plastically deformed by these forging processes, and work hardening occurs on the surface of the material.

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６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３７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 abuts on the end of 33, the pressure punch 35 is further moved, so that the material 10 fills the forming hole 34. On the other hand, the material 10 on the pressure punch side also fills the surplus hole forming hole 36, and this pressurizing action has the serration portion 6 on the shaft 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 37 is moved and positioned on the center line of the receiving piece 31.

このトリミングパンチ３７はあらかじめその内形状が受け駒３１の成形穴形状と一致するようになっており、図３に示すように、トリミングパンチ３７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３７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３７で前記セレーション部６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６が形成された二次加工素材１３は次にローリング工程４０に供給される。   The trimming punch 37 has an inner shape that matches the shape of the forming hole of the receiving piece 31 in advance, and the trimming punch 37 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 37 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 same shape as the serration portion 6 is formed by the trimming punch 37. In this way, the secondary processed material 13 having the serrations 6 formed on the entire outer periphery of the head 3 is then supplied to the rolling process 40.

このローリング工程４０では、セレーション部６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。尚、この実施の形態においては、螺合部として雌ねじが形成される下穴４を有するボス部材の製造方法について説明したが、何もこれに限定されるものではなく、例えば、軸部２の外周に雄ねじが形成されたボス部材にも適用できる製造方法である。   In this rolling process 40, the head 3 having the serration unit 6 is supplied between the rolling dies (not shown) in a state where the shaft unit 2 is suspended, and the secondary work material 13 includes the 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. In addition, in this embodiment, although the manufacturing method of the boss | hub member which has the pilot hole 4 in which an internal thread is formed as a screwing part was demonstrated, nothing is limited to this, For example, the shaft part 2 It is a manufacturing method applicable also to the boss member in which the external thread was formed in the perimeter.

本発明を示す製造工程のフロー図である。It is a flowchart of the manufacturing process which shows this invention. 頭部圧造工程における加圧状態を示す要部断面図である。It is principal part sectional drawing which shows the pressurization state in a head forging process. トリミング作業を示す要部断面図である。It is principal part sectional drawing which shows a trimming operation | work. 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製造工程のフロー図である。It is a flowchart of the manufacturing process which shows the prior art example of this invention. 図７の従来例で形成されたボス部材の使用状態を示す要部断面図である。It is principal part sectional drawing which shows the use condition of the boss member formed in the prior art example of FIG.

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 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
３７ トリミングパンチ
４０ 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 Serration part 10 Material 11 Primary processed material 12 Extra material 13 Secondary processed material 14 Dregs 20 Drilling process 30 Head pressing process 31 Receiving piece 32 Support hole 33 Extrusion Pin 34 Molding Hole 35 Pressurized Punch 36 Extra Thickness Forming Hole 37 Trimming Punch 40 Rolling Process

Claims (2)

一端に軸部より大径のセレーション部（６）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）はあらかじめ熱処理され且つ所定硬度を有するアルミニウム合金熱処理材であって、これに圧造加工を行い、セレーション部を有する頭部と締結部材が螺合される螺合部を形成した軸部とを有する一次加工素材（１１）を得、次に次工程のローリング工程（４０）において、前記一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。   Production of a boss member having a head (3) having a serration portion (6) larger in diameter than the shaft at one end and a groove-shaped recess (5) on the outer periphery of the neck between the head and the shaft The material (10) is a heat-treated aluminum alloy heat-treated material that has been heat-treated in advance and has a predetermined hardness, and is subjected to a forging process to form a threaded portion in which a head having a serration portion and a fastening member are screwed together. A boss member (1) is obtained by obtaining a primary processed material (11) having a shaft portion and then forming the concave portion on the outer periphery of the neck portion of the primary processed material by a rolling process in the next rolling step (40). The manufacturing method of the boss | hub member characterized by making it obtain. アルミ合金熱処理材はその硬度が少なくともＨＶ１００以上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 heat-treated aluminum alloy has a hardness of at least HV100 or more.

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