JP2639278B2 - Manufacturing method of boss for steering wheel core - Google Patents
Manufacturing method of boss for steering wheel coreInfo
- Publication number
- JP2639278B2 JP2639278B2 JP14280392A JP14280392A JP2639278B2 JP 2639278 B2 JP2639278 B2 JP 2639278B2 JP 14280392 A JP14280392 A JP 14280392A JP 14280392 A JP14280392 A JP 14280392A JP 2639278 B2 JP2639278 B2 JP 2639278B2
- Authority
- JP
- Japan
- Prior art keywords
- boss
- manufacturing
- die
- forming
- wheel core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Steering Controls (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ダイカスト製のステア
リングホイール芯金（「ホイール芯金」と略することが
ある。）を製造する際に使用するボスを鍛造により製造
する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forging a boss used for manufacturing a die-cast steering wheel core (sometimes abbreviated as "wheel core").
【０００２】[0002]
【従来の技術】従来のダイカストにより芯金を製造する
際に使用するボスの形状は、ボスプレート部（ダイカス
トで形成される）からのボスの抜止め・回り止めの為
に、円筒状体の中間高さ位置の外周部に、通常、六角形
の回り止めつば部を有するものであった。2. Description of the Related Art A conventional boss used for manufacturing a core metal by die casting has a cylindrical body for preventing the boss from being removed from a boss plate portion (formed by die casting) and preventing the boss from rotating. The outer peripheral portion at the intermediate height position usually has a hexagonal detent collar.
【０００３】そして、上記形状のボスを鍛造により製造
する方法として、例えば、特開平２−１７１３８２号公
報に記載されている下記構成の方法がある。As a method of manufacturing a boss having the above-mentioned shape by forging, for example, there is a method having the following structure described in Japanese Patent Application Laid-Open No. 2-171382.
【０００４】「スポークを介してホイールリングが固定
されるボスプレートを外部に固定せしめるステアリング
ホイール用ボスの製造方法において、素材の軸方向上下
両面にそれぞれパンチを押圧させて、上記素材の上下両
面に凹部をそれぞれ形成すると共に該凹部の縁部に面取
り加工を行なう第１工程と、上記素材の上下一対の凹部
内に上下一対の凹部成形用パンチを夫々圧入して、上記
各凹部の深さ寸法を大きくすると共に上記素材を軸方向
に延ばす第２工程と、上記素材の両凹部を軸方向に貫通
させて貫通孔を形成する第３工程と、上記素材の下側の
貫通孔内面に下端開口に向かって貫通孔内径寸法が徐徐
に大きくなる傾斜面を形成するとともに該傾斜面形成時
の余分な材料を流動させて素材外面の所定箇所に鍔部を
形成する第４工程と、上記素材の貫通孔の傾斜面形成部
以外の貫通孔内面の所定箇所にセレーション加工を行な
う第５工程と、を備えるようにしたことを特徴とするス
テアリングホイール用ボスの製造方法。」[0004] In a method of manufacturing a boss for a steering wheel in which a boss plate to which a wheel ring is fixed via spokes is fixed to the outside, punches are pressed on both upper and lower surfaces in the axial direction of the material, and the upper and lower surfaces of the material are pressed on the upper and lower surfaces. A first step of forming recesses and chamfering edges of the recesses, and pressing a pair of upper and lower recess forming punches into a pair of upper and lower recesses of the material, respectively; A second step of extending the material in the axial direction and a third step of axially penetrating both recesses of the material to form a through hole; and a lower end opening in the inner surface of the lower through hole of the material. Forming a slope at which the inner diameter of the through-hole gradually increases toward the bottom, and forming a flange at a predetermined location on the outer surface of the material by flowing excess material when the slope is formed. The method of the boss for a steering wheel, characterized in that as and a fifth step of performing serration into a predetermined position of the through-hole inner surface other than the inclined surface forming portion of the through hole of the material. "
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記方法によ
り、上記形状の芯金用ボスを製造した場合、下記のよう
な問題点があることが分かった。However, it has been found that when the core metal boss having the above-mentioned shape is manufactured by the above-mentioned method, there are the following problems.
【０００６】即ち、上記第４工程で回り止めつば部を形
成する工程において、該つば部は、通常、六角形状に密
閉型で賦形する。この為、鋳造型（上・下ダイス）が複
雑となると共に、素材重量にばらつきがあった場合、外
面のつば部形状にばらつきが発生し易い。That is, in the step of forming the detent collar portion in the fourth step, the collar portion is usually formed into a hexagonal shape by a closed mold. For this reason, the casting mold (upper / lower dies) becomes complicated, and if there is a variation in the material weight, the brim shape of the outer surface tends to vary.
【０００７】本発明は、上記にかんがみ、製造に際し
て、つば部形成の為の複雑な形状の鍛造型が不要で、し
かも、外面のつば部形状にばらつきが発生し難い、ステ
アリングホイール芯金用ボスの製造方法を提供すること
を目的とする。In view of the above, the present invention does not require a forging die having a complicated shape for forming a brim portion at the time of manufacture, and furthermore, a boss for a steering wheel core bar is less likely to vary in outer shape of a brim portion. It is an object of the present invention to provide a method for producing the same.
【０００８】[0008]
【課題を解決するための手段】本発明のホイール芯金用
ボスの製造方法は、上記課題を、下記構成により解決す
るものである。A method of manufacturing a boss for a wheel core according to the present invention solves the above-mentioned problems by the following constitution.
【０００９】ダイカスト製のステアリングホイール芯金
を製造する際に使用するボスを鍛造により製造する方法
であって、(1) 上下に凹部を有する予備成形された筒状
素材を、上・下ダイスで前記筒状素材の中間高さ位置の
外周に開放隙間を有して保持し、該開放隙間に前記筒状
素材の内部材料を流入させて略同心円状の予備成形つば
部を形成する工程、(2) 前記予備成形つば部の一部を耳
切りして回り止めつば部を形成する工程、の各工程を少
なくとも含むことを特徴とする。A method for manufacturing a boss used in manufacturing a die-cast steering wheel core by forging, comprising: (1) a preformed tubular material having upper and lower concave portions is formed by upper and lower dies; A step of forming a substantially concentric preformed brim portion by holding an open gap on the outer periphery at the intermediate height position of the cylindrical material and allowing the internal material of the cylindrical material to flow into the open gap, ( 2) forming a detent collar by trimming a part of the pre-formed collar.
【００１０】[0010]
【実施例】次に、本発明のホイール用芯金の製造方法
を、一実施例に基づいて詳細に説明をする。Next, a method of manufacturing a metal core for a wheel according to the present invention will be described in detail based on an embodiment.
【００１１】Ａ．(1) 材料取り：素材として予め切断し
た棒状材料を使用しても良いが、本実施例では、下記方
法により材料取りを行なう（図２参照）。A. (1) Material removal: Although a rod-shaped material cut in advance may be used as a material, in this embodiment, material removal is performed by the following method (see FIG. 2).
【００１２】アンコイラー１２にセットされたコイル
状線材（鋼材）１４を、矯正機１６の矯正ローラ群１８
の間を通過させ、線材１４の曲がりクセを矯正する。こ
のとき、線材の太さは、例えば、２０〜２２mmφの鋼材
を使用する。A coiled wire (steel) 14 set on the uncoiler 12 is fed to a straightening roller group 18 of a straightening machine 16.
To correct the bending of the wire 14. At this time, the thickness of the wire is, for example, a steel material having a diameter of 20 to 22 mmφ.
【００１３】上記線材を冷間鍛造装置２０に送り込
み、該装置２０に付設されている切断装置（図示せず）
で所定長に切断して第一素材２２を調製する。切断長さ
は、例えば、２１〜２２mmとする。The wire is fed into a cold forging device 20 and a cutting device (not shown) attached to the device 20.
Then, the first material 22 is prepared by cutting into a predetermined length. The cutting length is, for example, 21 to 22 mm.
【００１４】(2) 端面矯正工程（図１(1) ）：第一ダイ
ス２４の成形丸孔２６に、第一素材２２を第一下パンチ
２８で保持した状態で、第一上パンチ３０により押圧し
て端面矯正を行ない第二素材３２とする。このとき、第
一下パンチ２８及び第一上パンチ３０は、夫々、中央部
が若干膨出しており、第二素材３２の両端面の中央部に
取りかかり凹部３４、３４が形成される。ここで、第二
素材３２は第一素材２２から高さが縮むとともに横に若
干広がる。(2) End face correction step (FIG. 1 (1)): The first material 22 is held in the formed round hole 26 of the first die 24 by the first upper punch 30 while being held by the first lower punch 28. Pressing is performed to correct the end surface to obtain a second material 32. At this time, the first lower punch 28 and the first upper punch 30 each have a slightly bulged central portion, and the first raw punch 28 and the first upper punch 30 are formed at the central portions of both end surfaces of the second material 32 to form concave portions 34, 34. Here, the height of the second material 32 is reduced from the first material 22 and is slightly widened.
【００１５】(3) 第一後方押出工程（図１(2) ）：上記
第二素材３２を、第二ダイス３６の成形丸孔３７にセッ
トし、第二上パンチ３８で上面を保持した状態で、第二
下パンチ４０を第二素材の下端面に圧入して、下側予備
成形凹部４２を後方押出により形成して、第三素材４４
とする。ここで、第三素材４４は第二素材３２から高さ
が伸びると共に横にも若干広がる。(3) First backward extrusion step (FIG. 1 (2)): The second material 32 is set in the round hole 37 of the second die 36, and the upper surface is held by the second upper punch 38. Then, the second lower punch 40 is pressed into the lower end surface of the second material, and the lower preformed recess 42 is formed by backward extrusion, and the third material 44 is formed.
And Here, the third material 44 extends slightly from the second material 32 as well as the height.
【００１６】(4) 第二後方押出工程（図１(3) ）：上記
第三素材４４を、第三ダイス４６の成形丸孔４８にセッ
トし、第三下パンチ５０を下側予備成形凹部４２に挿入
保持した状態で、第三上パンチ５２を第三素材４４の上
端面に圧入して、上側予備成形凹部５４を後方押出によ
り形成して、第四素材５６とする。このとき、第三下パ
ンチ５０の成形部が円錐台形状とされており、同時に下
側予備成形凹部４２は、下端拡径の予備成形テーパ凹部
５８となる。ここで、第四素材５６は第三素材４４から
高さが伸びると共に横にも若干広がり、中間に厚肉膜部
５７を有する筒状体となる。。(4) Second backward extrusion step (FIG. 1 (3)): The third material 44 is set in the forming round hole 48 of the third die 46, and the third lower punch 50 is set in the lower preforming recess. In the state of being inserted and held in 42, the third upper punch 52 is pressed into the upper end surface of the third material 44, and the upper preformed concave portion 54 is formed by backward extrusion to form the fourth material 56. At this time, the forming portion of the third lower punch 50 has a truncated conical shape, and at the same time, the lower preforming concave portion 42 becomes a preforming tapered concave portion 58 having a larger diameter at the lower end. Here, the fourth material 56 extends from the third material 44 in height and slightly widens laterally, and becomes a cylindrical body having a thick film portion 57 in the middle. .
【００１７】(5) 予備成形つば部形成工程（図１(4)
）：上記第四素材５６を、上ダイス６０と下ダイス６
１とからなる第四ダイス６２にセットする。即ち、上・
下ダイス６０、６１で、中間高さ位置、即ち厚肉膜部５
７位置の外周に開放隙間６３を有してセットする。ま
た、この開放隙間６３の大きさは、６〜８mmとする。そ
して、第四下パンチ６４を予備成形テーパ凹部５８に挿
入すると共に、第四上パンチ６６を予備成形凹部５４に
挿入して夫々押圧する。すると、第四素材５６は高さ方
向に縮むと共に厚肉膜部５７は簿肉膜部５９となること
により、内部の余分な材料が上記第四ダイス６２に形成
された開放隙間６３に流入して同心円状の予備成形つば
部６８が形成されて第五素材７０となる。ここで、第五
素材７０に仕上げ寸法の上側凹部７１と下側テーパ凹部
７３が形成される。このとき、予備成形つば部６８の径
は、例えば、本体径を２４mmとしたとき、２７〜２９mm
となる。(5) Pre-formed brim portion forming step (FIG. 1 (4)
): The fourth material 56 is divided into an upper die 60 and a lower die 6.
The first die 62 is set on the fourth die 62. That is,
In the lower dies 60 and 61, the intermediate height position, that is, the thick film portion 5
It is set with an open gap 63 on the outer periphery at seven positions. The size of the open gap 63 is 6 to 8 mm. Then, the fourth lower punch 64 is inserted into the preformed tapered recess 58, and the fourth upper punch 66 is inserted into the preformed recess 54 and pressed. Then, the fourth material 56 shrinks in the height direction and the thick film portion 57 becomes the thick film portion 59, so that extra material inside flows into the open gap 63 formed in the fourth die 62. A concentric preformed brim portion 68 is formed to form a fifth material 70. Here, an upper concave portion 71 and a lower tapered concave portion 73 having finished dimensions are formed in the fifth material 70. At this time, the diameter of the preformed collar portion 68 is, for example, 27 to 29 mm when the body diameter is 24 mm.
Becomes
【００１８】(6) 簿肉膜部打ち抜き工程（図１(5) ）：
上記第五素材７０を、上ダイス７２と下ダイス７４とか
らなる第五ダイス７５４にセットする。即ち、上・下ダ
イス７２・７４で、第五素材７０の予備成形つば部６８
を挟持した状態で、打ち抜きパンチ７６で、残存してい
る簿肉膜部５９を打ち抜く、さらに、しごき棒（図示せ
ず）、打ち抜きバリを除去して第六素材７８とする。(6) Blanking film punching step (FIG. 1 (5)):
The fifth material 70 is set on a fifth die 754 including an upper die 72 and a lower die 74. That is, the upper and lower dies 72 and 74 are used to form a preformed flange 68 of the fifth material 70.
In the state in which is held, the remaining thick film portion 59 is punched out by a punching punch 76, and an ironing rod (not shown) and punching burrs are removed to obtain a sixth material 78.
【００１９】(7) 予備成形つば部の部耳切り工程（図１
(6) ） 上記第六素材７８の予備成形つば部６８を、冷間鍛造装
置２０に付設されている切断機を使用して、耳切りを行
なって、図３にに示すような中間高さ位置に回り止めつ
ば部８０を有する形状のボス製品とする。このとき、耳
切り部８２における、通常、残り代が０．２〜０．５mm
となるものとする。このとき、回り止め用つば部８０の
耳切り部８２の数は、図例では２個としたが、後述の回
り止め機能を奏する限り、１個もしくは３〜６個でもよ
い。(7) Step of trimming the preformed collar (FIG. 1)
(6)) The preformed brim portion 68 of the sixth material 78 is trimmed using a cutting machine attached to the cold forging device 20 to have an intermediate height as shown in FIG. A boss product having a shape having a detent collar 80 at a position. At this time, the remaining margin in the trimming portion 82 is usually 0.2 to 0.5 mm.
It is assumed that At this time, the number of the edge cut portions 82 of the detent collar 80 is two in the illustrated example, but may be one or three to six as long as the detent function described later is achieved.
【００２０】(8) こうして製造したボス８４は洗浄工程
を経て、コンベア８６で製品コンテナ８８に収納され
る。必要により、めっき工程を経て、製品となす。(8) The bosses 84 thus manufactured are stored in a product container 88 by a conveyor 86 through a cleaning process. If necessary, the product is made through a plating process.
【００２１】Ｂ．ボスの使用態様 上記のようにして製造したボス８４は、ステアリングホ
イール芯金のダイカスト成形型に、ホイール部を構成す
るパイプ材８６とともに、セットして、芯金をダイカス
ト成形する（図４参照）。この成形後の、ホイール芯金
は、ボス部に真円形状でないつば部８０を有し、ダイカ
スト成形されたポスプレート部８８との間に確実な回り
止め作用を奏する。B. Usage Mode of Boss The boss 84 manufactured as described above is set together with a pipe material 86 constituting a wheel portion in a die casting mold of a steering wheel core, and the core is die-cast (see FIG. 4). . After the molding, the wheel core metal has a flange portion 80 that is not a perfect circular shape in the boss portion, and exhibits a reliable detent function between the boss portion and the boss plate portion 88 that is die-cast.
【００２２】なお、本発明の技術的範囲は、上記実施例
に限定されるものではなく、特許請求の範囲に記載され
た範囲で、種々の態様に及ぶものである。The technical scope of the present invention is not limited to the above-described embodiment, but covers various modes within the scope described in the claims.
【００２３】また、図３に示す形状のボスを丸棒から切
削により、同心円状のつば部を有するものとした後、該
つば部耳切りしても成形できるが（従来の切削のみによ
り六角形状のつば部を形成する場合よりも工数が少なく
て済む。）、材料ロスが多くなり望ましくない。A boss having the shape shown in FIG. 3 may be formed by cutting a round bar into a concentric flange, and then trimming the flange. The number of man-hours can be reduced as compared with the case of forming the flange portion.), And material loss increases, which is not desirable.
【００２４】[0024]
【発明の作用・効果】本発明に係るホイール芯金用ボス
の製造方法は、上記構成により、下記のような作用・効
果を奏する。Operation and effect of the present invention The method of manufacturing a boss for a wheel core according to the present invention has the following operation and effects by the above configuration.
【００２５】回り止めのつば部を、従来、鍛造型で六角
形状に直接成形していたのに対し本発明では、ボスを鍛
造により形成する工程において、上下ダイスで形成され
る開放隙間に余分な内部材料を流入させて筒状本体と同
心円状に成形しておいて、後工程で耳切りを行ない、回
り止めつば部とする。この為、つば部形成のための複雑
な鋳造型が簡単となるとともに、素材重量にばらつきが
あっても、耳切り工程によりつば部形状のばらつきを補
正でき、回り止め用つば部形状の精度ばらつきが発生し
難い。Conventionally, the collar portion of the detent is directly formed into a hexagonal shape by a forging die. In the present invention, however, in the step of forming the boss by forging, an extra gap is formed in the open gap formed by the upper and lower dies. The internal material is allowed to flow in and formed concentrically with the cylindrical main body, and trimming is performed in a later step to form a detent collar. For this reason, a complicated casting mold for forming the collar portion is simplified, and even if the material weight varies, the variation in the shape of the collar portion can be corrected by the trimming process, and the variation in the accuracy of the shape of the collar portion for rotation prevention. Is unlikely to occur.
【図１】本発明のホイール芯金用ボスの製造工程を示す
概略図FIG. 1 is a schematic view showing a manufacturing process of a boss for a wheel core of the present invention.
【図２】本発明の製造方法に使用するボス製造装置の全
体概略図FIG. 2 is an overall schematic view of a boss manufacturing apparatus used in the manufacturing method of the present invention.
【図３】本発明で製造したホイール芯金用ボスの一例を
示す斜視図FIG. 3 is a perspective view showing one example of a wheel core boss manufactured by the present invention.
【図４】図３のボスを使用してダイカスト成形したホイ
ール芯金の断面図FIG. 4 is a sectional view of a wheel core metal die-cast using the boss of FIG. 3;
５４ 上側予備成形凹部 ５６ 第四素材 ５７ 厚肉膜部 ５８ 予備成形テーパ凹部 ６０ 上ダイス ６１ 下ダイス ６２ 第四ダイス ６３ 上下ダイスに形成される開放隙間 ６４ 第四上パンチ ６６ 第四下パンチ ６８ 予備成形つば部 ７０ 第五素材 ７８ 第六素材 ８０ 回り止めつば部 ８２ 耳切り部 ８４ ホイール芯金用ボス 54 upper preforming recess 56 fourth material 57 thick film portion 58 preforming taper recess 60 upper die 61 lower die 62 fourth die 63 open gap formed in upper and lower dies 64 fourth upper punch 66 fourth lower punch 68 preliminary Molded brim part 70 Fifth material 78 Sixth material 80 Non-rotating brim part 82 Edge cutting part 84 Wheel core boss
───────────────────────────────────────────────────── フロントページの続き (72)発明者 成田 巧 愛知県西春日井郡春日町大字落合字長畑 １番地 豊田合成株式会社内 (56)参考文献 特開 昭53−89851（ＪＰ，Ａ) 特開 昭60−203334（ＪＰ，Ａ) 特開 平１−317649（ＪＰ，Ａ) 特開 昭61−49736（ＪＰ，Ａ) 特開 平１−31537（ＪＰ，Ａ) 特開 平２−171382（ＪＰ，Ａ) 特開 平５−673（ＪＰ，Ａ) 特開 平５−139320（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takumi Narita 1 Ogataai Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (56) References JP-A-53-89851 (JP, A) JP-A Sho 60-203334 (JP, A) JP-A-1-317649 (JP, A) JP-A-61-49736 (JP, A) JP-A-1-31537 (JP, A) JP-A-2-171382 (JP, A A) JP-A-5-673 (JP, A) JP-A-5-139320 (JP, A)
Claims (1)
金を製造する際に使用するボスを鍛造により製造する方
法であって、 (1) 上下に凹部を有する予備成形された筒状素材を、上
・下ダイスで前記筒状素材の中間高さ位置の外周に開放
隙間を有して保持し、該開放隙間に前記筒状素材の内部
材料を流入させて略同心円状の予備成形つば部を形成す
る工程、 (2) 前記予備成形つば部の一部を耳切りして回り止めつ
ば部を形成する工程、 の各工程を少なくとも含むことを特徴とするステアリン
グホイール芯金用ボスの製造方法。1. A method of manufacturing a boss used for manufacturing a die-cast steering wheel core by forging, comprising: (1) forming a preformed tubular material having upper and lower recesses on an upper and lower part; A step of forming a substantially concentric preformed collar portion by holding an opening at an outer periphery of the cylindrical material at an intermediate height position with a die and allowing an internal material of the cylindrical material to flow into the opening gap; (2) A method of manufacturing a boss for a steering wheel core bar, which comprises at least steps of forming a detent collar by trimming a part of the preformed collar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14280392A JP2639278B2 (en) | 1992-06-03 | 1992-06-03 | Manufacturing method of boss for steering wheel core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14280392A JP2639278B2 (en) | 1992-06-03 | 1992-06-03 | Manufacturing method of boss for steering wheel core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05337592A JPH05337592A (en) | 1993-12-21 |
| JP2639278B2 true JP2639278B2 (en) | 1997-08-06 |
Family
ID=15324002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14280392A Expired - Fee Related JP2639278B2 (en) | 1992-06-03 | 1992-06-03 | Manufacturing method of boss for steering wheel core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2639278B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000063997A (en) * | 2000-08-16 | 2000-11-06 | 최경일 | Device for making a boss into a mold |
-
1992
- 1992-06-03 JP JP14280392A patent/JP2639278B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05337592A (en) | 1993-12-21 |
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