JP6538486B2 - Method of manufacturing coil spring and manufacturing apparatus of coil spring - Google Patents

Method of manufacturing coil spring and manufacturing apparatus of coil spring Download PDF

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Publication number
JP6538486B2
JP6538486B2 JP2015169300A JP2015169300A JP6538486B2 JP 6538486 B2 JP6538486 B2 JP 6538486B2 JP 2015169300 A JP2015169300 A JP 2015169300A JP 2015169300 A JP2015169300 A JP 2015169300A JP 6538486 B2 JP6538486 B2 JP 6538486B2
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coil portion
driven
coil
central axis
housing
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JP2017042810A (en
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誠記 伊藤
誠記 伊藤
年雄 ▲桑▼山
年雄 ▲桑▼山
大倉　伸介
伸介 大倉
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Chuo Hatsujo KK
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Chuo Hatsujo KK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically

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Description

本発明は、螺旋状のコイル部の中心軸線が湾曲したコイルばねの製造に関する。   The present invention relates to the manufacture of a coil spring in which the central axis of the spiral coil portion is curved.

例えば、特許文献１に記載のコイルばねの製造方法では、楔状の拡開ツールを径方向からコイル部に複数回打ち込む工程（以下、打込工程という。）を有する。
打込工程においては、拡開ツールの打ち込み位置は、打ち込まれる度に、コイル部に対して中心軸線に沿ってずれていく。つまり、特許文献１に記載のコイルばねの製造方法では、拡開ツールは、コイル部に対して中心軸線に沿ってずれながらコイル部に打ち込まれていく。 For example, the method for manufacturing a coil spring described in Patent Document 1 includes a step (hereinafter referred to as a driving step) in which a wedge-shaped expansion tool is driven into the coil portion from the radial direction a plurality of times.
In the driving process, the driving position of the expansion tool is shifted along the central axis with respect to the coil portion each time it is driven. That is, in the method for manufacturing a coil spring described in Patent Document 1, the expansion tool is driven into the coil portion while being shifted along the central axis with respect to the coil portion.

特開２００９−２２６４５０号公報JP, 2009-226450, A

しかし、拡開ツールがコイル部に対して中心軸線に沿ってずれながらコイル部に打ち込まれていくと、打込工程が終了したときに、コイルばね全体（中心軸線）が螺旋状に湾曲してしまい、コイルばねの平坦度が悪化する可能性が極めて高い。   However, when the expansion tool is driven into the coil portion while being shifted along the central axis with respect to the coil portion, the entire coil spring (central axis) is helically curved when the driving process is completed. It is very likely that the flatness of the coil spring will deteriorate.

コイルばねの平坦度とは、当該コイルばねが定盤等の平面に載置された場合において、当該ばねと当該平面との隙間をいう。仮に、中心軸線の曲率中心が同一平面に存在すれば、上記の隙間は極めて小さい値又は０となる。   The flatness of the coil spring means a gap between the spring and the plane when the coil spring is placed on a plane such as a platen. If the center of curvature of the central axis exists on the same plane, the above-mentioned gap becomes a very small value or zero.

本発明は、上記点に鑑み、コイル部の中心軸線が湾曲したコイルばねの製造において、平坦度が悪化することを抑制する。   In view of the above-mentioned point, the present invention controls degradation in flatness in manufacture of a coiled spring in which a central axis of a coil part curved.

本願では、線材（１Ａ）が螺旋状に巻かれたコイル部（１Ｂ）の中心軸線（Ｌｏ）が湾曲したコイルばねの製造方法であって、湾曲成形される前の中心軸線（Ｌｏ）と平行な方向を軸線方向（Ｌ１）とし、コイル部（１Ｂ）の内周方向と平行な方向を円周方向としたとき、コイル部（１Ｂ）の径方向に対して傾斜した傾斜面（１１Ａ）を有する楔体（１１）を径方向からコイル部（１Ｂ）に複数回打ち込む工程において、楔体（１１）が打ち込まれた後に、その打ち込まれた位置に対して軸線方向（Ｌ１）及び円周方向（Ｌ２）にずれた位置に楔体（１１）が打ち込まれる。   In the present application, a method of manufacturing a coil spring in which the central axis (Lo) of the coil portion (1B) in which the wire (1A) is spirally wound is curved is parallel to the central axis (Lo) before being curved and formed. The inclined surface (11A) inclined with respect to the radial direction of the coil portion (1B) is defined as the axial direction (L1) and the circumferential direction parallel to the inner circumferential direction of the coil portion (1B). In the step of driving the housing (11) into the coil portion (1B) a plurality of times from the radial direction, after the housing (11) is driven in, the axial direction (L1) and the circumferential direction with respect to the driven position The housing (11) is driven into the position shifted to (L2).

すなわち、コイル部（１Ｂ）の線材（１Ａ）は中心軸線（Ｌｏ）に対して傾いているので、楔体（１１）がコイル部（１Ｂ）に打ち込まれると、コイル部（１Ｂ）が捻れるように塑性変形する。   That is, since the wire (1A) of the coil portion (1B) is inclined with respect to the central axis (Lo), the coil portion (1B) is twisted when the housing (11) is driven into the coil portion (1B) Plastically deform.

このため、仮に、楔体（１１）がコイル部（１Ｂ）に対して中心軸線に沿って打ち込まれていくと、楔体（１１）が打ち込まれる度に、捻れが積算されていくので、コイルばね全体が大きく捻れてしまう。   For this reason, temporarily, if the housing (11) is driven into the coil portion (1B) along the central axis, since the torsion is integrated each time the housing (11) is driven, the coil The whole spring is twisted a lot.

これに対して、本願発明では、楔体（１１）が打ち込まれた後に、その打ち込まれた位置に対して軸線方向（Ｌ１）及び円周方向（Ｌ２）にずれた位置に楔体（１１）が打ち込まれる。   On the other hand, in the present invention, after the housing (11) is driven in, the housing (11) is displaced at a position shifted in the axial direction (L1) and the circumferential direction (L2) with respect to the driven position. Will be struck.

このため、前回の打ち込みによって発生したコイル部（１Ｂ）の捻れを相殺するような捻れを発生させることが可能となる。したがって、コイルばね全体が大きく捻れてしまうことを抑制できるので、平坦度が悪化することを抑制でき得る。   For this reason, it is possible to generate a twist that offsets the twist of the coil portion (1B) generated by the previous driving. Therefore, since it can suppress that the whole coiled spring is twisted large, it can suppress that a flatness worsens.

因みに、上記各括弧内の符号は、後述する実施形態に記載の具体的構成等との対応関係を示す一例であり、本発明は上記各括弧内の符号に示された具体的構成等に限定されるものではない。   Incidentally, the reference numerals in each of the above parentheses are an example showing the correspondence relationship with the specific configuration and the like described in the embodiments to be described later, and the present invention is limited to the specific configurations and the like shown in the reference numerals in each of the above parentheses. It is not something to be done.

Ａはアークスプリング１を示す図である。ＢはＺ巻の向きを示す図である。ＣはＳ巻の向きを示す図である。A is a view showing the arc spring 1. B is a figure which shows direction of Z volume. C is a figure which shows direction of S volume. Ａはコイルばねの製造装置を示す正面図である。Ｂは図２Ａの左側面図である。A is a front view showing a manufacturing apparatus of a coil spring. B is a left side view of FIG. 2A. Ａ及びＢは打ち込み位置を示す図である。A and B are figures which show a drive position. コイルばねの平坦度と送り角度との関係を示すグラフである。It is a graph which shows the relationship between the flatness of a coiled spring, and a feed angle.

以下に説明する「発明の実施形態」は実施形態の一例を示すものである。つまり、特許請求の範囲に記載された発明特定事項等は、下記の実施形態に示された具体的構成や構造等に限定されるものではない。   The “invention embodiment” described below shows an example of the embodiment. That is, the invention-specifying matters and the like described in the claims are not limited to the specific configuration and the structure and the like described in the following embodiments.

本実施形態は、自動車用のコイルばねの製造に本発明を適用したものである。各図に付された方向を示す矢印等は、各図相互の関係を理解し易くするために記載したものである。本発明は、各図に付された方向に限定されるものではない。   In the present embodiment, the present invention is applied to the manufacture of a coil spring for an automobile. Arrows or the like indicating the directions given to the respective drawings are provided to facilitate understanding of the relationship between the respective drawings. The present invention is not limited to the directions given in the respective drawings.

少なくとも符号を付して説明した部材又は部位は、「複数」や「２つ以上」等の断りをした場合を除き、少なくとも１つ設けられている。以下、本発明の実施形態を図面と共に説明する。   At least one member or part described with at least the reference numeral is provided except in the case where “plurality”, “two or more”, etc. are described. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（第１実施形態）
１．アークスプリング
図１Ａは、本実施形態に係るコイルばねの製造方法により製造されるばね（以下、アークスプリング１という。）を示す。アークスプリング１は、線材１Ａが螺旋状に巻かれたコイル部１Ｂの中心軸線Ｌｏが湾曲したコイルばねをいう。 First Embodiment
1. Arc Spring FIG. 1A shows a spring (hereinafter referred to as an arc spring 1) manufactured by the method for manufacturing a coil spring according to the present embodiment. The arc spring 1 refers to a coil spring in which a central axis Lo of the coil portion 1B in which the wire 1A is spirally wound is curved.

中心軸線Ｌｏとは、コイル部１Ｂの長手方向と直交する断面の図心を連ねた仮想線である。断面の図心とは、当該断面の面積モーメントが釣り合う点をいう。例えば、断面形状が円の場合には、断面の図心は、当該円形断面の中心と一致する。   The central axis Lo is an imaginary line in which the centers of the cross sections orthogonal to the longitudinal direction of the coil portion 1B are connected. The centroid of the cross section is a point at which the area moments of the cross section are balanced. For example, when the cross-sectional shape is a circle, the centroid of the cross section coincides with the center of the circular cross section.

本実施形態に係るコイルばねの製造方法では、「湾曲成形される前の中心軸線Ｌｏが直線状のコイルばね（図１Ｂ及び図１Ｃ参照）」の線材１Ａを塑性変形させることにより、中心軸線Ｌｏが円弧状に湾曲したアークスプリング１を製造する。   In the method of manufacturing a coil spring according to the present embodiment, the central axis Lo is obtained by plastically deforming the wire rod 1A of "a coil spring having a linear central axis Lo (refer to Figs. 1B and 1C) before being curved and formed". Manufactures an arc spring 1 curved in an arc shape.

２．「巻の向き」の定義
線材１Ａが図１Ｂに示す向きに螺旋状となっている場合を「Ｚ巻の向き」という。具体的には、中心軸線Ｌｏが上下方向に一致し、かつ、線材１Ａが向かって右上から左下に延びるように傾斜している状態を「Ｚ巻の向き」という。 2. Definition of "direction of winding" A case where the wire 1A is spiral in the direction shown in FIG. 1B is referred to as "direction of winding Z". Specifically, the state in which the central axis Lo coincides with the vertical direction and the wire 1A is inclined so as to extend from the upper right to the lower left is referred to as "Z-winding direction".

線材１Ａが図１Ｃに示す向きに螺旋状となっている場合を「Ｓ巻の向き」という。具体的には、中心軸線Ｌｏが上下方向に一致し、かつ、線材１Ａが向かって左上から右下に延びるように傾斜している状態を「Ｓ巻の向き」という。   The case where the wire rod 1A is helical in the direction shown in FIG. 1C is referred to as "the direction of the S winding". Specifically, the state in which the central axis Lo coincides with the vertical direction and the wire 1A is inclined so as to extend from the upper left to the lower right is referred to as "S-winding direction".

３．製造方法及び製造装置
図２Ａ及び図２Ｂは、本実施形態に係るコイルばねの製造装置１０の模式図である。当該コイルばねの製造装置１０は、本実施形態に係るコイルばねの製造方法を用いた製造装置である。 3. Manufacturing Method and Manufacturing Apparatus FIGS. 2A and 2B are schematic views of a manufacturing apparatus 10 of a coil spring according to the present embodiment. The manufacturing apparatus 10 of the said coiled spring is a manufacturing apparatus using the manufacturing method of the coiled spring which concerns on this embodiment.

楔体１１は、コイル部１Ｂの径方向に対して傾斜した傾斜面１１Ａを少なくとも１つ有する拡開ツールである。本実施形態に係る楔体１１は、６０度のテーパ角を有する円錐状である。楔体１１は、油圧又は空気圧を利用した打ち込み機構１２にて径方向からコイル部１Ｂに複数回打ち込まれる。以下、当該作動を打ち込み工程という。   The housing 11 is an expansion tool having at least one inclined surface 11A inclined with respect to the radial direction of the coil portion 1B. The housing 11 according to the present embodiment has a conical shape having a taper angle of 60 degrees. The housing 11 is driven into the coil portion 1B a plurality of times from the radial direction by the driving mechanism 12 using oil pressure or air pressure. Hereinafter, the operation is referred to as a driving process.

打ち込み工程では、コイル部１Ｂに楔体１１が打ち込まれた後、その打ち込まれた位置に対して軸線方向Ｌ１及び円周方向Ｌ２にずれた位置に楔体１１が打ち込まれる。軸線方向Ｌ１とは中心軸線Ｌｏと平行な方向である（図２Ａ参照）。円周方向Ｌ２とはコイル部１Ｂの内周方向と平行な方向をいう（図２Ｂ参照）。   In the driving step, after the housing 11 is driven into the coil portion 1B, the housing 11 is driven at a position deviated in the axial direction L1 and the circumferential direction L2 with respect to the driven position. The axial direction L1 is a direction parallel to the central axis Lo (see FIG. 2A). The circumferential direction L2 is a direction parallel to the inner circumferential direction of the coil portion 1B (see FIG. 2B).

すなわち、コイル部１Ｂが「Ｚ巻の向き」に螺旋状であるとき、楔体１１が打ち込まれる位置は、「Ｚ巻の向き」にずれていく。つまり、コイル部１Ｂが「Ｚ巻の向き」に螺旋状であるとき、楔体１１が打ち込まれる位置を連ねた仮想線は、図３Ａの一点鎖線Ｌ３に示すようになる。   That is, when the coil portion 1B is helical in the “direction of Z winding”, the position where the housing 11 is driven is shifted to the “direction of Z winding”. That is, when the coil portion 1B is helical in the “direction of Z winding”, a virtual line connecting the position where the housing 11 is driven is as shown by a dashed dotted line L3 in FIG. 3A.

コイル部１Ｂが「Ｓ巻の向き」に螺旋状であるとき、楔体１１が打ち込まれる位置は、「Ｓ巻の向き」にずれていく。つまり、コイル部１Ｂが「Ｓ巻の向き」に螺旋状であるとき、楔体１１が打ち込まれる位置を連ねた仮想線は、図３Ｂの一点鎖線Ｌ４に示すようになる。   When the coil portion 1B is helical in the “S-roll direction”, the position where the casing 11 is driven is shifted in the “S-roll direction”. That is, when the coil portion 1B is in the “S-turn direction” in a spiral shape, a virtual line connecting the position where the housing 11 is driven is as shown by a dashed dotted line L4 in FIG. 3B.

図２Ａに示す移動機構１３は、コイル部１Ｂを円周方向Ｌ２に回転させながらコイル部１Ｂを軸線方向Ｌ１に移動させる機構であって、打ち込み機構１２と連動してコイル部１Ｂを移動させる。   The moving mechanism 13 shown in FIG. 2A is a mechanism for moving the coil portion 1B in the axial direction L1 while rotating the coil portion 1B in the circumferential direction L2, and moves the coil portion 1B in conjunction with the driving mechanism 12.

つまり、楔体１１は、実線の位置から二点鎖線の位置に移動し、その後、実線の位置に復帰することにより１回の打ち込み作動が終了する。当該打ち込み作動が終了すると、移動機構１３は、コイル部１Ｂを予め設定された距離（以下、送り量という。）だけ軸線方向Ｌ１に移動させるとともに、予め設定された角度（以下、送り角度という。）だけコイル部１Ｂを円周方向Ｌ２に回転させる。   That is, the housing 11 moves from the position of the solid line to the position of the two-dot chain line, and then returns to the position of the solid line, thereby completing one driving operation. When the driving operation is completed, the moving mechanism 13 moves the coil portion 1B in the axial direction L1 by a predetermined distance (hereinafter referred to as a feed amount), and also refers to a preset angle (hereinafter referred to as a feed angle). ) To rotate the coil portion 1B in the circumferential direction L2.

移動機構１３によるコイル部１Ｂの移動作動が終了すると、再び、楔体１１の打ち込み作業が実行される。このように、楔体１１の打ち込み作業とコイル部１Ｂの移動作動とが交互に実行されることにより、楔体１１が打ち込まれる位置が、漸次、軸線方向Ｌ１及び円周方向Ｌ２にずれていく（図３Ａ及び図３Ｂ参照）。   When the moving operation of the coil portion 1B by the moving mechanism 13 is finished, the operation of driving the housing 11 is performed again. As described above, by alternately performing the operation of driving the housing 11 and the operation of moving the coil portion 1B, the position where the housing 11 is driven is gradually shifted in the axial direction L1 and the circumferential direction L2. (See FIGS. 3A and 3B).

なお、本実施形態では、線材１Ａが螺旋状に巻かれてコイル部１Ｂが成形された時点で熱処理が実行され、その後、打ち込み工程が完了した時点で再び熱処理が実行される。これにより、塑性変形により線材１Ａに生じた内部応力が除去される。   In the present embodiment, heat treatment is performed when the wire rod 1A is spirally wound to form the coil portion 1B, and then heat treatment is performed again when the implantation step is completed. Thereby, the internal stress which arose in wire 1A by plastic deformation is removed.

４．本実施形態に係るコイルばねの製造方法及び製造装置の特徴
コイル部１Ｂの線材１Ａは中心軸線Ｌｏに対して傾いているので、楔体１１がコイル部１Ｂに打ち込まれると、コイル部１Ｂが捻れるように塑性変形する。このため、仮に、楔体１１がコイル部１Ｂに対して中心軸線に沿って打ち込まれていくと、楔体１１が打ち込まれる度に、捻れが積算されていくので、アークスプリング１全体が大きく捻れてしまう。 4. The manufacturing method and manufacturing apparatus of the coil spring according to the present embodiment The wire rod 1A of the coil portion 1B is inclined with respect to the central axis Lo, so the coil portion 1B is twisted when the housing 11 is driven into the coil portion 1B. Plastically deforms to For this reason, temporarily, if the housing 11 is driven into the coil portion 1B along the central axis, the torsion is integrated each time the housing 11 is driven, so the entire arc spring 1 is greatly twisted. It will

これに対して、本実施形態では、「楔体１１が打ち込まれた後に、その打ち込まれた位置に対して軸線方向Ｌ１及び円周方向Ｌ２にずれた位置に楔体１１が打ち込まれる」ので、前回の打ち込みによって発生したコイル部１Ｂの捻れを相殺するような捻れが発生する。したがって、アークスプリング１全体が大きく捻れてしまうことを抑制できるので、平坦度が悪化することを抑制でき得る。   On the other hand, in the present embodiment, “after the housing 11 is driven, the housing 11 is driven at a position shifted in the axial direction L1 and the circumferential direction L2 with respect to the driven position”, Twisting occurs so as to offset the twisting of the coil portion 1B generated by the previous driving. Therefore, large distortion of the entire arc spring 1 can be suppressed, and deterioration of the flatness can be suppressed.

なお、図４は、送り量をコイル部１Ｂのピッチ寸法とし、コイル部１Ｂの巻数を５０とし、線材１Ａの線径を３．７ｍｍとし、内径寸法を１８．４ｍｍとし、線材１ＡをＳＷＯＳＣ−ＶＨとし、かつ、打ち込み工程を実行する前のコイル部１Ｂの自然長を約３００ｍｍとした場合において、アークスプリング１の平坦度と送り角度との関係を示す試験結果である。   In FIG. 4, the feed amount is the pitch of the coil portion 1B, the number of turns of the coil portion 1B is 50, the wire diameter of the wire 1A is 3.7 mm, the inner diameter is 18.4 mm, and the wire 1A is SWOSC- It is a test result which shows the relationship between the degree of flatness of arc spring 1, and sending angle, when it is VH and the natural length of coil part 1B before performing a pouring process is about 300 mm.

この試験結果からも明らかなように、送り角度を適切な角度（本実施形態では、約０．６度）とすることにより、アークスプリング１の平坦度が大きく悪化することを確実に抑制できる。   As apparent from this test result, by setting the feed angle to an appropriate angle (about 0.6 degrees in the present embodiment), it is possible to reliably suppress the flatness of the arc spring 1 from being greatly deteriorated.

（その他の実施形態）
上述の実施形態では、楔体１１の打ち込み回数はコイル部１Ｂの巻数と一致するが、本発明はこれに限定されるものではなく、楔体１１の打ち込み回数は少なくとも２回であれば十分である。 (Other embodiments)
In the above-mentioned embodiment, although the number of times of driving of housing 11 coincides with the number of turns of coil section 1B, the present invention is not limited to this, and it is sufficient if the number of times of driving of housing 11 is at least two. is there.

例えば、打ち込み回数がｎ回であるとき、少なくともｋ（＝１〜ｎ−１）回目の打ち込み位置とｋ＋１回目の打ち込み位置との間で軸線方向Ｌ１及び円周方向Ｌ２のずれがあればよい。さらに、ｋ回目の打ち込み位置とｋ＋１回目の打ち込み位置との差は不問である。つまり、１ピッチ毎に打ち込む場合や２ピッチ毎に打ち込む場合等であってもよい。   For example, when the number of times of driving is n times, it is sufficient if there is a deviation between the axial direction L1 and the circumferential direction L2 between at least the k (= 1 to n-1) driving position and the k + 1 driving position. Furthermore, the difference between the k-th driving position and the k + 1-th driving position is irrelevant. That is, it may be the case of driving in every one pitch or the case of driving in every two pitches.

上述の実施形態では、線材１Ａが螺旋状に巻かれてコイル部１Ｂが成形された時点で熱処理が実行され、その後、打ち込み工程が完了した時点で再び熱処理が実行されたが、本発明はこれに限定されるものではない。   In the above embodiment, the heat treatment is performed when the wire rod 1A is spirally wound and the coil portion 1B is formed, and then the heat treatment is performed again when the implantation step is completed. It is not limited to

上述の実施形態では、６０度のテーパ角を有する円錐にて楔体１１が構成されていたが、本発明はこれに限定されるものではない。
上述の実施形態では、楔体１１の先端がコイル部１Ｂの中心に到達するまで打ち込まれたが、本発明はこれに限定されるものではない。 In the above-mentioned embodiment, although the housing 11 was comprised with the cone which has a taper angle of 60 degree | times, this invention is not limited to this.
In the above-mentioned embodiment, although the tip of housing 11 was driven in until it reached the center of coil part 1B, the present invention is not limited to this.

上述の実施形態に係るコイル部１Ｂは円形であったが、本発明はこれに限定されるものではなく、例えば楕円形であってもよい。
上述の実施形態では、自動車用コイルばねの製造に本発明を適用したが、本発明の適用はこれに限定されるものではなく、その他のコイルばねの製造にも適用できる。 Although coil part 1B concerning the above-mentioned embodiment was circular, the present invention is not limited to this, for example, may be elliptical.
In the above-mentioned embodiment, although the present invention was applied to manufacture of a coil spring for cars, application of the present invention is not limited to this, and it is applicable also to manufacture of other coil springs.

また、本発明は、特許請求の範囲に記載された発明の趣旨に合致するものであればよく、上述の実施形態に限定されるものではない。   Furthermore, the present invention is not limited to the above-described embodiment as long as it conforms to the spirit of the invention described in the claims.

１… アークスプリング
１Ａ… 線材
１Ｂ… コイル部
１０… コイルばねの製造装置
１１… 楔体
１２… 打ち込み機構
１３… 移動機構 DESCRIPTION OF SYMBOLS 1 ... Arc spring 1A ... Wire rod 1B ... Coil part 10 ... Manufacturing apparatus of a coil spring 11 ... Housing 12 ... Drive-in mechanism 13 ... Movement mechanism

Claims (4)

線材が螺旋状に巻かれたコイル部の中心軸線が湾曲したコイルばねの製造方法であって、
湾曲成形される前の前記中心軸線と平行な方向を軸線方向とし、前記コイル部の内周方向と平行な方向を円周方向としたとき、
前記コイル部の径方向に対して傾斜した傾斜面を有する楔体を前記径方向から前記コイル部に複数回打ち込む工程において、
前記楔体が打ち込まれた後に、その打ち込まれた位置に対して前記軸線方向及び前記円周方向にずれた位置に前記楔体が打ち込まれ、
前記楔体が打ち込まれる位置を連ねた仮想線は、前記軸線方向に対して傾いた直線となることを特徴とするコイルばねの製造方法。 A manufacturing method of a coil spring in which a central axis of a coil portion in which a wire is spirally wound is curved,
When a direction parallel to the central axis before being curved and formed is taken as an axial direction, and a direction parallel to the inner circumferential direction of the coil part is taken as a circumferential direction,
In the step of driving a rod body having an inclined surface inclined with respect to the radial direction of the coil portion into the coil portion a plurality of times from the radial direction,
After the housing is driven, the housing is driven at a position offset in the axial direction and the circumferential direction with respect to the driven position ,
The virtual line wedge has been chosen position, which are discharged, the method of manufacturing a coil spring, wherein a straight line and a Rukoto inclined with respect to the axial direction. 前記中心軸線が上下方向に一致し、かつ、前記コイル部の線材が向かって右上から左下に延びるように傾斜している状態を「Ｚ巻の向き」としたとき、
前記コイル部が「Ｚ巻の向き」に螺旋状であるとき、前記楔体が打ち込まれる位置は、「Ｚ巻の向き」にずれていくことを特徴とする請求項１に記載のコイルばねの製造方法。 When the state in which the central axis coincides with the vertical direction and the wire of the coil portion is inclined so as to extend from the upper right to the lower left is "direction of Z winding",
The coil spring according to claim 1, characterized in that when the coil portion is helical in the "direction of Z winding", the position where the casing is driven is deviated in the "direction of Z winding". Production method. 前記中心軸線が上下方向に一致し、かつ、前記コイル部の線材が向かって左上から右下に延びるように傾斜している状態を「Ｓ巻の向き」としたとき、
前記コイル部が「Ｓ巻の向き」に螺旋状であるとき、前記楔体が打ち込まれる位置は、「Ｓ巻の向き」にずれていくことを特徴とする請求項１に記載のコイルばねの製造方法。 When the state in which the central axis coincides with the vertical direction and the wire of the coil portion is inclined so as to extend from the upper left to the lower right is "direction of S winding",
The coil spring according to claim 1, wherein when the coil portion is helical in the "S-turn direction", the position where the casing is driven is shifted in the "S-roll direction". Production method. 線材が螺旋状に巻かれたコイル部の中心軸線が湾曲したコイルばねの製造装置であって、
湾曲成形される前の前記中心軸線と平行な方向を軸線方向とし、前記コイル部の内周方向と平行な方向を円周方向としたとき、
前記コイル部の径方向に対して傾斜した傾斜面を有する楔体を前記径方向から前記コイル部に複数回打ち込む打ち込み機構を備え、
前記打ち込み機構は、前記楔体を打ち込んだ後に、その打ち込んだ位置に対して前記軸線方向及び前記円周方向にずれた位置に前記楔体を打ち込み、
前記楔体が打ち込まれる位置を連ねた仮想線は、前記軸線方向に対して傾いた直線となることを特徴とするコイルばねの製造装置。 A manufacturing apparatus of a coil spring in which a central axis of a coil portion in which a wire is spirally wound is curved,
When a direction parallel to the central axis before being curved and formed is taken as an axial direction, and a direction parallel to the inner circumferential direction of the coil part is taken as a circumferential direction,
And a driving mechanism for driving a housing having an inclined surface inclined with respect to the radial direction of the coil portion a plurality of times from the radial direction to the coil portion,
The driving mechanism, after typing the wedge, see write hit the wedge at a position shifted in the axial direction and the circumferential direction with respect to the implanted's position,
The imaginary line connecting the positions where the housing is driven is a straight line inclined with respect to the axial direction .
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WO2021193211A1 (en) * 2020-03-25 2021-09-30 日本発條株式会社 Method and apparatus for manufacturing arc spring
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