JP4506198B2 - Bush and bushing manufacturing method - Google Patents

Bush and bushing manufacturing method Download PDF

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JP4506198B2
JP4506198B2 JP2004047981A JP2004047981A JP4506198B2 JP 4506198 B2 JP4506198 B2 JP 4506198B2 JP 2004047981 A JP2004047981 A JP 2004047981A JP 2004047981 A JP2004047981 A JP 2004047981A JP 4506198 B2 JP4506198 B2 JP 4506198B2
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plate
bush
shaped material
bearing layer
strip
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JP2005240847A (en
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隆広 黒野
徳万 加藤
隆博 白根
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Taiho Kogyo Co Ltd
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Description

本発明は、板状素材を湾曲させて筒状に成形したブシュとブシュの製造方法に関する。 The present invention relates to a bush formed by bending a plate-shaped material into a cylindrical shape and a method for manufacturing the bush.

従来、ブシュとして裏金と軸受層とを備えたものは周知であり、その製造方法は一般に、裏金と軸受層とを備えた帯状素材を所定長さに切断して板状素材を形成し、次に板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形している（例えば引用文献１、引用文献２、引用文献３）。
特開２０００−２８３１６６号公報 特開昭６４−６９８１９号公報 特開昭５７−７２７７３号公報 Conventionally, a bush having a back metal and a bearing layer is well known, and a manufacturing method thereof is generally formed by cutting a strip-shaped material having a back metal and a bearing layer into a predetermined length to form a plate-like material. The both ends of the plate-like material are curved so as to abut each other and are formed into a cylindrical shape (for example, cited document 1, cited document 2, cited document 3).
JP 2000-283166 A JP-A 64-69819 JP-A-57-72773

従来、上記帯状素材を所定長さに切断する際には、その帯状素材の長手方向と直交する方向に直線的に切断するようにしていた。その結果、上記切断によって得られた板状素材の両端部を相互に突き合わせて筒状に湾曲成形する際に、最初に両端部の幅方向におけるいずれかの一側すなわち板状素材の一方の角部が接触してから、他方の角部に向けて両端部の全域が相互に密着するように成形されることがある。
この場合、最初に接触した角部の変形が大きくなると、特に角部においては、裏金と軸受層との間にクラックが生じる危険性が高くなっていた。この傾向は、軸受層が、裏金に対して塑性変形能力が小さい合成樹脂系の軸受層の場合に特に顕著となっており、量産工程で不良率が２０〜３０％に達することがあった。
また従来、板状素材を筒状に湾曲成形すると、ブシュの外周面における軸方向中央部分が両端部よりも僅かに凹んだ鞍形になり易く、ブシュ背面の真直度が悪いという問題点もあった。
本発明はこのような事情に鑑み、裏金と軸受層との間にクラックが生じる危険性を低減することができるとともに、ブシュ背面の真直度を良好なものとすることができるブシュとブシュの製造方法を提供するものである。 Conventionally, when the strip material is cut into a predetermined length, the strip material is linearly cut in a direction perpendicular to the longitudinal direction of the strip material. As a result, when both ends of the plate-like material obtained by the above-mentioned cutting are brought into contact with each other to be curved and formed into a cylindrical shape, first, either one side in the width direction of both ends, that is, one corner of the plate-like material. After the parts come into contact with each other, the whole area of both end parts may be molded so as to be in close contact with each other toward the other corner part.
In this case, when the deformation of the corner portion that is contacted first increases, the risk of cracks occurring between the back metal and the bearing layer increases, particularly in the corner portion. This tendency is particularly prominent when the bearing layer is a synthetic resin-based bearing layer having a small plastic deformation capacity with respect to the back metal, and the defect rate may reach 20 to 30% in the mass production process.
Conventionally, when a plate-shaped material is curved and formed into a cylindrical shape, there is a problem that the axial center portion of the outer peripheral surface of the bush tends to be a concave shape slightly recessed from both ends, and the straightness of the back surface of the bush is poor. It was.
In view of such circumstances, the present invention can reduce the risk of cracking between the back metal and the bearing layer, and can produce a bush and a bush that can improve the straightness of the back surface of the bush . A method is provided.

すなわち請求項１の発明は、裏金と軸受層とを備えた帯状素材を所定長さに切断して板状素材を形成し、次に板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形するブシュの製造方法において、
上記板状素材の少なくとも一方の端部における幅方向中央部を突出させて形成し、かつ該端部を、上記帯状素材の長手方向と直交する方向に形成された先端面と、この先端面の両側から突出方向に対して斜め後方に直線状に切断された傾斜面とによって台形状に形成し、次にこの板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形することを特徴とするものである。
また請求項５の発明は、裏金と軸受層とを備えた板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形したブシュにおいて、
上記板状素材の少なくとも一方の端部は、該端部における幅方向中央部が突出されて、その突出方向と直交する方向に形成された先端面と、この先端面の両側から突出方向に対して斜め後方に直線状に切断された傾斜面とによって台形状に形成されていることを特徴とするものである。 That is, the invention of claim 1 forms a plate-like material by cutting a strip-like material provided with a back metal and a bearing layer into a predetermined length, and then curves both ends of the plate-like material so as to abut each other. In the method of manufacturing a bush that is molded into a cylindrical shape,
A widthwise central portion of at least one end portion of the plate-shaped material is formed so as to protrude , and the end portion is formed in a direction perpendicular to the longitudinal direction of the strip-shaped material, and the tip surface It is formed in a trapezoidal shape with an inclined surface cut linearly obliquely rearward from the both sides in the protruding direction, and then curved so that both ends of the plate-like material abut each other and formed into a cylindrical shape . It is characterized by this.
The invention of claim 5 is a bush formed into a cylindrical shape by curving so that both end portions of a plate-like material provided with a back metal and a bearing layer face each other.
At least one end portion of the plate-like material has a front end surface formed in a direction perpendicular to the projecting direction with a center portion in the width direction projecting from the end portion, and the projecting direction from both sides of the front end surface. Thus, it is formed in a trapezoidal shape by an inclined surface that is cut obliquely rearward and linearly.

請求項１の発明によれば、最初に接触するのは必ず幅方向中央部の突出部分となるので、角部に比較して裏金と軸受層との間にクラックが生じる危険性を低減することができる。
また、板状素材の幅方向中央部における長さ方向の寸法は、幅方向両側における長さ方向の寸法よりも長くなるので、ブシュの外周面における軸方向中央部分が両端部よりも僅かに凹んだ鞍形になるのを抑制することができ、それによってブシュ背面の真直度を良好なものとすることができる。
したがって請求項５の発明によれば、裏金と軸受層との間にクラックが生じている危険性の少ない、かつ真直度が良好なブシュを提供することができる。 According to the first aspect of the present invention , the first contact is always the projecting portion of the central portion in the width direction, so that the risk of cracking between the back metal and the bearing layer is reduced compared to the corner portion. Can do.
In addition, since the dimension in the length direction at the center part in the width direction of the plate-like material is longer than the dimension in the length direction on both sides in the width direction, the center part in the axial direction on the outer peripheral surface of the bush is slightly recessed from both ends. It is possible to suppress the formation of a bowl shape, thereby making it possible to improve the straightness of the back surface of the bush.
Therefore, according to the fifth aspect of the present invention, it is possible to provide a bush having a low risk of cracking between the back metal and the bearing layer and having a good straightness.

以下図示実施例について本発明の製造方法を説明すると、図１において、裏金と軸受層とを備えた帯状素材１は所要長さに切断されて板状素材２が形成される。上記板状素材２を切断する際には、帯状素材１と板状素材２との間に、帯状素材１の幅方向中央部がくびれたスクラップ３が形成されるようになり、スクラップ３を形成しながら板状素材２を帯状素材１から順次切断することによって、板状素材１の両端部４における幅方向中央部がそれぞれ突出されるようになる。   The manufacturing method of the present invention will be described below with reference to the illustrated embodiment. In FIG. 1, a strip-shaped material 1 having a back metal and a bearing layer is cut to a required length to form a plate-shaped material 2. When the plate-like material 2 is cut, a scrap 3 is formed between the belt-like material 1 and the plate-like material 2, with the center portion in the width direction of the belt-like material 1 being narrowed to form the scrap 3. While the plate-like material 2 is sequentially cut from the belt-like material 1, the widthwise central portions at both end portions 4 of the plate-like material 1 are projected.

図示実施例では、上記各端部４は、帯状素材１の長手方向と直交する方向に形成された先端面４Ａと、この先端面４Ａの両側から突出方向に対して斜め後方に直線状に切断された傾斜面４Ｂ，４Ｂとによって、それぞれ台形状に突出形成されている。
このとき各傾斜面４Ｂは、それぞれ全体の幅方向寸法Ｗに対して、１／１０以上の幅方向寸法Ｗ１の範囲で形成することが好ましく、また帯状素材１の長手方向と直交する方向を基準とする傾斜面の角度θは、２〜６°の範囲に設定することが好ましい。さらに、傾斜面４Ｂと板状素材２の側面との角部には僅かに面取りを施すことが望ましい。 In the illustrated embodiment, each of the end portions 4 is linearly cut obliquely rearward from the front end surface 4A formed in a direction orthogonal to the longitudinal direction of the strip-shaped material 1 and the protruding direction from both sides of the front end surface 4A. Each of the inclined surfaces 4B and 4B has a trapezoidal shape.
At this time, each inclined surface 4B is preferably formed in the range of the width direction dimension W1 of 1/10 or more with respect to the entire width direction dimension W, and the direction orthogonal to the longitudinal direction of the strip-shaped material 1 is used as a reference. The angle θ of the inclined surface is preferably set in the range of 2 to 6 °. Furthermore, it is desirable to slightly chamfer the corner portion between the inclined surface 4B and the side surface of the plate material 2.

上述したようにして帯状素材１から板状素材２を切断形成したら、次に板状素材２の両端部４，４を相互に突き合わせるように湾曲させて筒状に成形する。板状素材２を筒状に成形するには従来公知の方法で行えばよく、例えば２分割した型枠によって板状素材２を筒状に成形することができる。   After the plate-like material 2 is cut and formed from the strip-like material 1 as described above, the two end portions 4 and 4 of the plate-like material 2 are then bent so as to abut each other and formed into a cylindrical shape. The plate-shaped material 2 may be formed into a cylindrical shape by a conventionally known method. For example, the plate-shaped material 2 can be formed into a cylindrical shape by a two-divided mold.

次に、本発明の作用効果を実験結果に基づいて説明する。
先ず、帯状素材としては、鋼板の裏金と、樹脂とグラファイトを主成分とする軸受層とを密着させてなる帯状素材１を用いた。なお、軸受層は銅系合金、アルミニウム系合金もしくは樹脂と軟質金属を多孔質焼結層に含浸した樹脂材料を使用することもできる。
本発明品１としては、上記帯状素材１から切り出した板状素材２の幅Ｗを２７ｍｍとし、両端部の幅方向中央部における長さ方向の寸法Ｌは５５．１ｍｍとしてある。また両端部はそれぞれ台形状に形成し、各傾斜面４Ｂの幅方向の寸法Ｗ１を上記幅Ｗの１／１０以上である３ｍｍに設定し、さらに上記角度θは３°に設定した。また、各傾斜面４Ｂと板状素材２の側面との角部には半径０．８ｍｍの円弧で面取りを施した。 Next, the function and effect of the present invention will be described based on experimental results.
First, as the band-shaped material, a band-shaped material 1 in which a back plate of a steel plate and a bearing layer mainly composed of a resin and graphite were adhered to each other was used. The bearing layer may be made of a copper alloy, an aluminum alloy, or a resin material in which a porous sintered layer is impregnated with a resin and a soft metal.
As the product 1 of the present invention, the width W of the plate-shaped material 2 cut out from the band-shaped material 1 is 27 mm, and the length dimension L in the center portion in the width direction at both ends is 55.1 mm. Both end portions were each formed in a trapezoidal shape, the dimension W1 in the width direction of each inclined surface 4B was set to 3 mm which is 1/10 or more of the width W, and the angle θ was set to 3 °. Further, the corners between the inclined surfaces 4B and the side surfaces of the plate material 2 were chamfered with an arc having a radius of 0.8 mm.

また本発明品２としては、上記帯状素材１から切り出した板状素材２の幅Ｗを１２．２ｍｍとし、両端部の幅方向中央部における長さ方向の寸法Ｌは５５．１ｍｍとしてある。また両端部はそれぞれ台形状に形成し、各傾斜面４Ｂの幅方向の寸法Ｗ１を上記幅Ｗの１／１０以上である１．５ｍｍに設定し、さらに上記角度θは３°に設定した。この板状素材にも上記と同様の面取りを施した。
さらに比較例として、上記帯状素材１を長手方向と直交する方向に直線的に切断して板状素材２を製造した。この板状素材の幅Ｗは２７ｍｍとし、長さ方向の寸法Ｌは５５．１ｍｍとした。この比較例にも上記と同様の面取りを施してある。
そして上記本発明品１、２及び比較例ともに同一条件で、２分割した図示しない型枠によって軸受層が内側となるように湾曲させて、それぞれ筒状のブシュを製造した。 Moreover, as this invention product 2, the width W of the plate-shaped raw material 2 cut out from the said strip-shaped raw material 1 shall be 12.2 mm, and the dimension L of the length direction in the center part of the width direction of both ends is 55.1 mm. Both end portions were formed in a trapezoidal shape, the width direction dimension W1 of each inclined surface 4B was set to 1.5 mm which is 1/10 or more of the width W, and the angle θ was set to 3 °. This plate material was also chamfered as described above.
Furthermore, as a comparative example, the strip-shaped material 1 was cut linearly in a direction perpendicular to the longitudinal direction to produce a plate-shaped material 2. The width W of this plate-shaped material was 27 mm, and the dimension L in the length direction was 55.1 mm. This comparative example is also chamfered as described above.
Then, the invention products 1 and 2 and the comparative example were each bent under the same conditions so that the bearing layer was inside by means of a mold (not shown) that was divided into two to produce cylindrical bushes.

図２はクラックの発生率を示した図であり、図３はブシュ背面の鞍形そり量を示した図である。
図２から理解されるように、比較例では１２〜３２％の不良率があるのに対し、本発明品２では３％以下とすることができ、また本発明品１ではほぼ零とすることができた。
また図３から理解されるように、比較例におけるブシュ背面の鞍形そり量は７０〜９０μｍと大きいのに対し、本発明品１では１０〜２０μｍと小さくすることができ、したがって背面真直度を良好なものとすることができた。 FIG. 2 is a diagram showing the rate of occurrence of cracks, and FIG. 3 is a diagram showing the amount of saddle warp on the back of the bush.
As can be seen from FIG. 2, the comparative example has a defect rate of 12 to 32%, whereas the present product 2 can be 3% or less, and the present product 1 should be almost zero. I was able to.
In addition, as can be seen from FIG. 3, the amount of saddle warp on the back surface of the bush in the comparative example is as large as 70 to 90 μm, whereas in the product 1 of the present invention, it can be as small as 10 to 20 μm. It was able to be good.

本発明の製造方法を説明する平面図。The top view explaining the manufacturing method of this invention. クラックの発生率を示した実験結果図。The experimental result figure which showed the incidence rate of a crack. ブシュ背面の鞍形そり量を示した実験結果図。The experimental result figure which showed the amount of bowl-shaped warpage of a bush back.

符号の説明Explanation of symbols

１ 帯状素材 ２ 板状素材
４ 端部 ４Ａ先端面
４Ｂ傾斜面
Ｗ 板状素材２の幅方向寸法
Ｗ１ 傾斜面４Ｂの幅方向寸法
θ 傾斜面４Ｂの角度 DESCRIPTION OF SYMBOLS 1 Band-shaped material 2 Plate-shaped material 4 End part 4A tip surface 4B inclined surface W Width direction dimension of plate-shaped material 2 W1 Width direction dimension of inclined surface 4B θ Angle of inclined surface 4B

Claims (5)

裏金と軸受層とを備えた帯状素材を所定長さに切断して板状素材を形成し、次に板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形するブシュの製造方法において、
上記板状素材の少なくとも一方の端部における幅方向中央部を突出させて形成し、かつ該端部を、上記帯状素材の長手方向と直交する方向に形成された先端面と、この先端面の両側から突出方向に対して斜め後方に直線状に切断された傾斜面とによって台形状に形成し、次にこの板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形することを特徴とするブシュの製造方法。 A bush material that is formed by cutting a strip-shaped material having a backing metal and a bearing layer into a predetermined length to form a plate-shaped material, and then bending the both ends of the plate-shaped material so as to abut each other. In the manufacturing method,
A widthwise central portion of at least one end portion of the plate-shaped material is formed so as to protrude , and the end portion is formed in a direction perpendicular to the longitudinal direction of the strip-shaped material, and the tip surface It is formed in a trapezoidal shape with an inclined surface cut linearly obliquely rearward from the both sides in the protruding direction, and then curved so that both ends of the plate-like material abut each other and formed into a cylindrical shape . A bushing manufacturing method characterized by the above. 上記各傾斜面における幅方向の寸法は、それぞれ全体の幅方向寸法の１／１０以上であることを特徴とする請求項１に記載のブシュの製造方法。 2. The method for manufacturing a bush according to claim 1 , wherein a dimension in the width direction of each of the inclined surfaces is 1/10 or more of a whole dimension in the width direction. 上記帯状素材の長手方向と直交する方向を基準とする傾斜面の角度は、２〜６°の範囲であることを特徴とする請求項１又は請求項２に記載のブシュの製造方法。 3. The method for manufacturing a bush according to claim 1 , wherein an angle of the inclined surface with respect to a direction orthogonal to the longitudinal direction of the strip-shaped material is in a range of 2 to 6 °. 上記軸受層は、合成樹脂系の軸受層であることを特徴とする請求項１ないし請求項３のいずれかに記載のブシュの製造方法。 The bearing layer may bushing method according to any one of claims 1 to claim 3, characterized in that a bearing layer of synthetic resin. 裏金と軸受層とを備えた板状素材の両端部を相互に突き合わせるように湾曲させて筒状に成形したブシュにおいて、  In the bush formed by bending the both ends of the plate-like material provided with the back metal and the bearing layer so as to face each other,
上記板状素材の少なくとも一方の端部は、該端部における幅方向中央部が突出されて、その突出方向と直交する方向に形成された先端面と、この先端面の両側から突出方向に対して斜め後方に直線状に切断された傾斜面とによって台形状に形成されていることを特徴とするブシュ。  At least one end portion of the plate-like material has a front end surface formed in a direction perpendicular to the projecting direction with a center portion in the width direction protruding from the end portion, and the projecting direction from both sides of the front end surface The bush is formed in a trapezoidal shape by an inclined surface cut linearly and obliquely rearward.
JP2004047981A 2004-02-24 2004-02-24 Bush and bushing manufacturing method Expired - Lifetime JP4506198B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57154341A (en) * 1981-03-18 1982-09-24 Taiyo Stainless Spring Kk Production for bush to be inserted
JPS59140919A (en) * 1983-02-02 1984-08-13 Shokichi Suzuki Spherical bearing and its manufacturing method
JP2001153142A (en) * 1999-11-25 2001-06-08 Oiles Ind Co Ltd Doublelayer cylindrical winding bearing and method of manufacture therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57154341A (en) * 1981-03-18 1982-09-24 Taiyo Stainless Spring Kk Production for bush to be inserted
JPS59140919A (en) * 1983-02-02 1984-08-13 Shokichi Suzuki Spherical bearing and its manufacturing method
JP2001153142A (en) * 1999-11-25 2001-06-08 Oiles Ind Co Ltd Doublelayer cylindrical winding bearing and method of manufacture therefor

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