JP2007069245A - Method for producing tappet roller - Google Patents

Method for producing tappet roller Download PDF

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JP2007069245A
JP2007069245A JP2005259159A JP2005259159A JP2007069245A JP 2007069245 A JP2007069245 A JP 2007069245A JP 2005259159 A JP2005259159 A JP 2005259159A JP 2005259159 A JP2005259159 A JP 2005259159A JP 2007069245 A JP2007069245 A JP 2007069245A
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diameter
axial
tappet roller
peripheral
curved
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JP4760242B2 (en
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Kazuto Kobayashi
Kohei Mori
Seiji Otsuka
清司 大塚
一登 小林
浩平 森
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Nsk Ltd
日本精工株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To realize a method for producing a tappet roller with which the tappet roller 8 having sufficient shaped precision and dimensional precision can be produced at a low cost. <P>SOLUTION: A billet 14 in (A) is compressed in the axial direction to obtain a first intermediate blank 17 in (C), to which a rear part extrusion-working is applied to form a bottomed cylindrical second intermediate blank 18 shown in (D). Successively, a cylindrical third intermediate blank 30 shown in (E) is obtained by punch-working, and this third intermediate blank 30 is compressed in the axial direction to form a fourth intermediate blank 36 shown in (F), with which the axial directional size is matched with the axial directional size b of the tappet roller 8 and the excessive thickness portion exceeding the volume of the tappet roller 8 is set free in the direction for bulging the inner peripheral surface in the diameter direction. Thereafter, after forming a fifth intermediate blank 42 by collecting the above excessive thickness portion into an inward flange-state excessive thickness part 41 projecting to the inner part in the diameter direction from a part of the axial direction of the inner peripheral surface, this excessive thickness part 41 is removed to form the above tappet roller 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明に係るタペットローラの製造方法は、エンジンの動弁機構に組み込むカムフォロア装置を構成するタペットローラを造る為に利用する。   The tappet roller manufacturing method according to the present invention is used to manufacture a tappet roller that constitutes a cam follower device incorporated in an engine valve mechanism.

エンジンのクランクシャフトと同期して回転するカムシャフトに固定のカムの動きをバルブに伝達する為の動弁機構に於いて、運転時に於ける摩擦を滑り摩擦から転がり摩擦に変える事によって当該部分の摩擦損失を低く抑え、燃費性能の向上を図る為に、例えば特許文献1〜3に記載されている様な、カムフォロア装置が広く用いられている。図5〜6は、この様なカムフォロア装置の1例を示している。カムフォロアの本体であるロッカーアーム1は、その長さ方向(図5の左右方向)中間部に形成した軸孔2に挿通したロッカー軸3により、内燃機関の機関本体(図示せず)に回転自在に支持される。又、上記ロッカーアーム1の基端部(図5の左端部)にアジャストボルト4を、この基端部に形成したねじ孔に螺合させると共にロックナット5を緊締する事により固定している。そして、上記アジャストボルト4の先端面(図5の下端面)に、機関本体(図示せず)に往復移動可能に支持された吸気弁又は排気弁である機関弁6の基端面(図5の上端面)を当接させている。この機関弁6は、弁ばね7によって常に閉弁方向(上記アジャストボルト4との当接方向)に付勢されている。従って上記ロッカーアーム1は、図5で時計方向の弾性が付与されている。   In the valve mechanism for transmitting the movement of the cam fixed to the camshaft that rotates in synchronization with the crankshaft of the engine to the valve, the friction during operation is changed from sliding friction to rolling friction. In order to keep friction loss low and improve fuel efficiency, cam follower devices such as those described in Patent Documents 1 to 3 are widely used. 5 to 6 show an example of such a cam follower device. A rocker arm 1 which is a main body of the cam follower is rotatable to an engine main body (not shown) of an internal combustion engine by a rocker shaft 3 inserted through a shaft hole 2 formed in an intermediate portion in the length direction (left-right direction in FIG. 5). Supported by Further, an adjusting bolt 4 is screwed into a screw hole formed in the base end portion of the rocker arm 1 (the left end portion in FIG. 5), and the lock nut 5 is tightened. The base end surface of the engine valve 6 (in FIG. 5), which is an intake valve or an exhaust valve, is supported on the front end surface (the lower end surface of FIG. 5) of the adjustment bolt 4 so as to be reciprocally movable by an engine body (not shown). The upper end surface is in contact. The engine valve 6 is always urged by a valve spring 7 in the valve closing direction (direction in contact with the adjusting bolt 4). Therefore, the rocker arm 1 is imparted with clockwise elasticity in FIG.

一方、上記ロッカーアーム1の先端部(図5の右端部)には、本発明の対象となるタペットローラ8を、ローラ支持軸9を介して回転自在に支持している。この為に、上記ロッカーアーム1の先端部に互いに間隔をあけて平行に設けた、1対の支持壁10、10同士の間に、上記ローラ支持軸9を掛け渡している。そして、このローラ支持軸9の中間部で上記両支持壁10、10の内側面同士の間に位置する部分の周囲に上記タペットローラ8を、複数のニードル11、11を介して、回転自在に支持している。この様にして、上記ロッカーアーム1の先端部に回転自在に支持した、上記タペットローラ8の外周面を、上記弁ばね7の弾力に基づいて、カム12の外周面に当接させている。このカム12は、クランク軸(図示せず)に連動して回転するカム軸13に一体に形成され、上記機関本体に回転自在に支持されている。この構成により、このカム軸13の回転を、上記ロッカー軸3を中心とする上記ロッカーアーム1の往復揺動運動に変換し、更にこのロッカーアーム1により上記機関弁6を、上記弁ばね7の弾力に抗し、或いはこの弾力に基づいて、軸方向に往復移動させる。そして、上記機関本体のシリンダ頂部に設けた吸気口或いは排気口の開閉動作を行なう。   On the other hand, a tappet roller 8 which is an object of the present invention is rotatably supported by a tip end portion (right end portion in FIG. 5) of the rocker arm 1 via a roller support shaft 9. For this purpose, the roller support shaft 9 is spanned between a pair of support walls 10 and 10 provided in parallel at a distance from each other at the tip of the rocker arm 1. Then, the tappet roller 8 can be rotated through a plurality of needles 11 and 11 around a portion located between the inner side surfaces of the support walls 10 and 10 at an intermediate portion of the roller support shaft 9. I support it. In this way, the outer peripheral surface of the tappet roller 8 rotatably supported at the tip of the rocker arm 1 is brought into contact with the outer peripheral surface of the cam 12 based on the elasticity of the valve spring 7. The cam 12 is formed integrally with a camshaft 13 that rotates in conjunction with a crankshaft (not shown), and is rotatably supported by the engine body. With this configuration, the rotation of the camshaft 13 is converted into a reciprocating swinging motion of the rocker arm 1 about the rocker shaft 3, and the engine valve 6 is further moved by the rocker arm 1 to the valve spring 7. It is reciprocated in the axial direction against the elasticity or based on this elasticity. And the opening / closing operation | movement of the inlet port or exhaust port provided in the cylinder top part of the said engine main body is performed.

上述の様なカムフォロア装置を構成する、上記タペットローラ8を造るのに従来は、軸受鋼等の金属製の素材に、熱間鍛造等の塑性加工や、旋削、研削等の削り加工を施して、所定の形状及び寸法に加工していた。この様にして上記タペットローラ8を造ると、このタペットローラ8の製造コストが嵩む事が避けられない。これに対して、特許文献4には、円柱状の素材に冷間加工を施す事でリング状部品とする発明が記載されている。この様な特許文献4に記載された発明により上記タペットローラ8を造れば、このタペットローラ8の製造コストを抑えられるものと考えられる。但し、上記特許文献4に記載された発明の場合には、冷間加工の際に軸方向寸法の規制を行なわない為、得られたリング状部品の軸方向長さの精度、延ては体積の精度を確保できない。この為、塑性加工だけで(コスト上昇の要因となる旋削等の削り加工を行なう事なく)十分な形状精度及び寸法精度を有するタペットローラ8を造る事は難しい。   Conventionally, the tappet roller 8 constituting the cam follower device as described above is manufactured by performing plastic processing such as hot forging, or turning processing such as turning and grinding on a metal material such as bearing steel. And processed into a predetermined shape and dimensions. When the tappet roller 8 is manufactured in this way, it is inevitable that the manufacturing cost of the tappet roller 8 increases. On the other hand, Patent Document 4 describes an invention in which a ring-shaped part is formed by cold-working a cylindrical material. If the tappet roller 8 is manufactured according to the invention described in Patent Document 4, it is considered that the manufacturing cost of the tappet roller 8 can be suppressed. However, in the case of the invention described in Patent Document 4, since the axial dimension is not restricted during the cold working, the accuracy of the axial length of the obtained ring-shaped part, and hence the volume The accuracy of cannot be ensured. For this reason, it is difficult to produce the tappet roller 8 having sufficient shape accuracy and dimensional accuracy only by plastic processing (without performing turning such as turning which causes cost increase).

特開2001−280106号公報JP 2001-280106 A 特開2004−100499号公報JP 2004-1000049 A 実開昭60−88016号公報Japanese Utility Model Publication No. 60-88016 特開2000−94080号公報JP 2000-94080 A

本発明は、上述の様な事情に鑑みて、十分な形状精度及び寸法精度を有するタペットローラを低コストで造れる製造方法を実現すべく発明したものである。   The present invention has been invented to realize a manufacturing method capable of manufacturing a tappet roller having sufficient shape accuracy and dimensional accuracy at low cost in view of the above-described circumstances.

本発明のタペットローラの製造方法は、先ず、軸受鋼、炭素鋼等、熱処理により必要とする硬度を確保できる金属製で、円柱状のビレットを軸方向に圧縮して得た、円形(厚肉円板状)の第一中間素材の中心部を、軸方向に圧縮する。
そして、この中心部の軸方向寸法を縮めると共に外径寄り部分を軸方向に向け円筒状に変形させる押出加工により、有底円筒状の第二中間素材とする。この押出加工としては、上記外径寄り部分を押圧方向に関して後方に変形させる後方押出加工、或いは、押圧方向に関して前方に変形させる前方押出加工を採用できる。何れにしても、その後、この第二中間素材の底部を打ち抜く事により、造るべきタペットローラの容積よりも大きな容積を有する、円筒状の第三中間素材とする。
次いで、この第三中間素材の外周面を金型により外径が拡大しない様に拘束すると共に、内周面の少なくとも一部を(内径を縮小可能にすべく)拘束しない状態で、上記第三中間素材を軸方向に圧縮する。そして、軸方向寸法が上記タペットローラの軸方向寸法と一致し、このタペットローラの容積を上回る余肉部分を上記内周面を径方向に膨らませる方向に逃がした、第四中間素材とする。
その後、この第四中間素材の外周面を拘束した状態で、この第四中間素材の内径側に上記タペットローラの内径と一致する外径を有する扱き治具を押し込む事により、上記余肉部分を内周面の軸方向一部から径方向内方に突出する内向フランジ状部分に集めて、第五中間素材とする。
その後、この内向フランジ状部分を除去して、内径、外径、軸方向長さを規制値とした、円筒状のタペットローラとする。
The tappet roller manufacturing method of the present invention is made of a metal (such as bearing steel, carbon steel, etc., which can ensure the required hardness by heat treatment, and is obtained by compressing a cylindrical billet in the axial direction. The center portion of the first intermediate material having a disc shape is compressed in the axial direction.
Then, a bottomed cylindrical second intermediate material is obtained by an extrusion process in which the axial dimension of the central portion is reduced and the portion closer to the outer diameter is deformed into a cylindrical shape in the axial direction. As this extrusion process, a rear extrusion process in which the portion near the outer diameter is deformed rearward in the pressing direction, or a front extrusion process in which the outer circumferential part is deformed forward in the pressing direction can be employed. In any case, a cylindrical third intermediate material having a volume larger than that of the tappet roller to be manufactured is formed by punching out the bottom of the second intermediate material.
Next, the outer peripheral surface of the third intermediate material is constrained by the mold so that the outer diameter is not enlarged, and at least a part of the inner peripheral surface is not constrained (in order to reduce the inner diameter). The intermediate material is compressed in the axial direction. Then, a fourth intermediate material in which the axial dimension coincides with the axial dimension of the tappet roller and the surplus portion exceeding the volume of the tappet roller is released in a direction in which the inner peripheral surface is expanded in the radial direction is used.
After that, with the outer peripheral surface of the fourth intermediate material constrained, by pushing a handling jig having an outer diameter that matches the inner diameter of the tappet roller into the inner diameter side of the fourth intermediate material, the surplus portion is removed. Collected in an inward flange-like portion projecting radially inward from a portion of the inner peripheral surface in the axial direction to form a fifth intermediate material.
Thereafter, the inward flange-shaped portion is removed to obtain a cylindrical tappet roller with the inner diameter, the outer diameter, and the axial length as regulation values.

上述の様に構成する本発明のタペットローラの製造方法によれば、内径、外径、軸方向寸法を適正値に規制し、且つ、内周面の中心軸と外周面の中心軸とを厳密に一致させたタペットローラを、材料の歩留を良好にし、しかも容易に、且つ、能率良く造れる。例えば、アンコイラから引き出した長尺な線材を切断してビレットを得る様にすれば、パーツフォーマーを使用して、この線材から上記タペットローラを、連続一貫加工する事ができる。この結果、このタペットローラ、更にはこのタペットローラを組み込んだカムフォロア装置の製造コストを、実用上十分な性能を確保しつつ、低減できる。   According to the manufacturing method of the tappet roller of the present invention configured as described above, the inner diameter, the outer diameter, and the axial dimension are restricted to appropriate values, and the central axis of the inner peripheral surface and the central axis of the outer peripheral surface are strictly set. The tappet roller matched to the above can be easily and efficiently manufactured with good material yield. For example, if a long wire drawn from an uncoiler is cut to obtain a billet, the tappet roller can be continuously and continuously processed from this wire using a parts former. As a result, the manufacturing cost of this tappet roller and further the cam follower device incorporating this tappet roller can be reduced while ensuring a practically sufficient performance.

本発明を実施する場合に好ましくは、例えば請求項2に記載した様に、第一中間素材をタペットローラに迄加工する過程で、外周面と軸方向一端面とを連続させる第一外径側曲面部と、外周面と軸方向他端面とを連続させる第二外径側曲面部と、内周面と軸方向一端面とを連続させる第一内径側曲面部と、内周面と軸方向他端面とを連続させる第二内径側曲面部とを形成する。各曲面部を加工する順序、同時に加工する曲面部の数は、特に問わない。
上記タペットローラの軸方向両端面の内外両周縁部には、応力の集中に基づく亀裂等の損傷の発生を防止する為に、断面四分の一円弧状の曲面部(隅R部)を形成する事が好ましい。但し、この様な曲面部の加工を独立した工程で行なうと、上記タペットローラの製造コストを低減する効果が薄れる。これに対して、上述した様に、上記各曲面部を、各工程で他の加工と同時に行なえば、上記タペットローラの製造コストを低減する効果を十分に得られる。
In the case of carrying out the present invention, preferably, as described in claim 2, for example, in the process of processing the first intermediate material up to the tappet roller, the first outer diameter side that makes the outer peripheral surface and one axial end surface continuous. A curved surface portion, a second outer-diameter-side curved surface portion that continues the outer peripheral surface and the other axial end surface, a first inner-diameter-side curved surface portion that continues the inner peripheral surface and the one axial end surface, the inner peripheral surface and the axial direction A second inner diameter side curved surface portion that is continuous with the other end surface is formed. The order of processing each curved surface portion and the number of curved surface portions processed simultaneously are not particularly limited.
In order to prevent the occurrence of damage such as cracks due to the concentration of stress, the curved surface part (corner R part) of a quarter of the cross section is formed on the inner and outer peripheral parts of both end faces in the axial direction of the tappet roller. It is preferable to do. However, if such processing of the curved surface portion is performed in an independent process, the effect of reducing the manufacturing cost of the tappet roller is reduced. On the other hand, as described above, if each curved surface portion is performed simultaneously with other processing in each step, an effect of reducing the manufacturing cost of the tappet roller can be sufficiently obtained.

又、本発明を実施する場合に好ましくは、請求項3に記載した様に、第一中間素材の外径を、造るべきタペットローラの外径よりも大きくする。そして、この第一中間素材を第二中間素材とする押出加工時に、内径を適正寸法としたダイスの内周面でこの第一中間素材の外周を扱く事により、この押出加工により得られる第二中間素材の外径を、上記タペットローラの外径に一致する上記適正寸法とする。更に、その後に行なう加工を、各段階での素材を、それぞれの内径をこの適正寸法とした、別のダイスの内径側に保持した状態で行なう。
この様に、早い段階で(上記第二中間素材を得る段階で)、中間素材の外径を完成後のタペットローラの外径に一致させ、その後は各中間素材の外径を変化させない様にすれば、これら各中間素材に対する加工量を低く抑えられる。この結果、加工コストの低減を図れるだけでなく、加工に伴って素材の内部に生じる歪みを低く抑えられて、得られたタペットローラの耐久性を中心とする性能の向上を図れる。
Moreover, when implementing this invention, Preferably, as described in claim 3, the outer diameter of the first intermediate material is made larger than the outer diameter of the tappet roller to be manufactured. Then, during the extrusion process using the first intermediate material as the second intermediate material, the outer periphery of the first intermediate material is handled by the inner peripheral surface of the die having an inner diameter of an appropriate dimension. The outer diameter of the second intermediate material is set to the appropriate dimension that matches the outer diameter of the tappet roller. Further, the subsequent processing is performed in a state where the material in each stage is held on the inner diameter side of another die with the inner diameters set to the appropriate dimensions.
In this way, at an early stage (at the stage of obtaining the second intermediate material), the outer diameter of the intermediate material is matched with the outer diameter of the tappet roller after completion, and thereafter the outer diameter of each intermediate material is not changed. By doing so, the amount of processing for each of these intermediate materials can be kept low. As a result, not only the processing cost can be reduced, but also the distortion generated in the material accompanying the processing can be kept low, and the performance centering on the durability of the obtained tappet roller can be improved.

図1〜3は、本発明の実施例1を示している。本実施例では、冷間加工により、図1の(H)及び図5、6に示す様な、円筒状のタペットローラ8を造る。この為に本実施例では、先ず、アンコイラから引き出した長尺な線材(図示せず)を所定長さに切断して、図1の(A)に示す様なビレット(円柱状素材)14を得る。このビレット14は、ドラムに巻回した長尺な上記線材をアンコイラから引き出しつつ、得るべきタペットローラ8の容積よりも少し大きな容積となるだけの長さ寸法(上記所定長さ)に切断する事により得る。   1-3 show Example 1 of the present invention. In this embodiment, a cylindrical tappet roller 8 as shown in FIG. 1H and FIGS. 5 and 6 is manufactured by cold working. Therefore, in this embodiment, first, a long wire (not shown) drawn from the uncoiler is cut into a predetermined length, and a billet (columnar material) 14 as shown in FIG. obtain. The billet 14 is cut into a length dimension (predetermined length) that is slightly larger than the volume of the tappet roller 8 to be obtained while pulling out the long wire wound around the drum from the uncoiler. By

この様にして得たビレット14は、軸方向両端面を、中心軸に対し直交する平坦面として、予備中間素材15とする。即ち、上記ビレット14の軸方向両端面の形状は、図1の(A)に誇張して示す様に、歪んでいる場合が多いので、このビレット14を矯正用金型の間で挟持する等して、上記軸方向両端面を、上記中心軸に対し直交する平坦面に加工する。本実施例の場合には、これら軸方向両端面を平坦面に加工すると同時に、軸方向一端部に、軸方向端面に向かうに従って外径が小さくなる方向に傾斜したテーパ部16を形成する。尚、この様な予備中間素材15を加工する工程は、上記線材を切断して上記ビレット14とする工程、或いはその後このビレット14に施す加工によっては、省略する事もできる。即ち、上記線材を切断する工程を、例えばレーザカッタ等、切断面の性状を良好にできる加工方法により行なうのであれば、上記予備中間素材15を加工する工程は不要である。或いは、上記ビレット14の軸方向両端面に対応する部分は、何れ、ピアス加工により除去する部分である。従って、この軸方向両端面の性状が不良である事自体は、完成後のタペットローラ8の品質に悪影響を及ぼす事はない。従って、上記ピアス加工を行なう迄の間、上記軸方向両端面の性状が不良である事が、上記ビレット14や中間素材の姿勢安定化等の為に悪影響を及ぼさないのであれば、やはり、上記予備中間素材15を加工する工程は不要である。   The billet 14 obtained in this way is used as the preliminary intermediate material 15 with both axial end surfaces being flat surfaces orthogonal to the central axis. That is, the shape of both end faces in the axial direction of the billet 14 is often distorted as shown exaggeratedly in FIG. 1A, so that the billet 14 is sandwiched between correction dies, etc. Then, both end surfaces in the axial direction are processed into flat surfaces orthogonal to the central axis. In the case of the present embodiment, both end surfaces in the axial direction are processed into flat surfaces, and at the same time, a tapered portion 16 that is inclined in a direction in which the outer diameter decreases toward the axial end surface is formed at one end portion in the axial direction. The step of processing the preliminary intermediate material 15 can be omitted depending on the step of cutting the wire to form the billet 14 or the processing applied to the billet 14 thereafter. That is, if the step of cutting the wire is performed by a processing method that can improve the properties of the cut surface, such as a laser cutter, the step of processing the preliminary intermediate material 15 is unnecessary. Or the part corresponding to the axial direction both end surfaces of the said billet 14 is a part removed by piercing process anyway. Therefore, the fact that the properties of both end surfaces in the axial direction are poor does not adversely affect the quality of the completed tappet roller 8. Therefore, until the piercing process is performed, if the properties of the axial end faces do not adversely affect the posture of the billet 14 or the intermediate material, the above-mentioned The process of processing the preliminary intermediate material 15 is not necessary.

本実施例の場合には、上記予備中間素材15の加工に続いて、この予備中間素材15を軸方向に圧縮する据え込み加工により、図1の(C)に示す様な第一中間素材17とする。この場合に、上記予備中間素材15を、第一の受型に設けた、得るべき上記タペットローラ8の外径aよりも少し(△a分)だけ大きな内径を有する有底で円形の第一の受孔内に、この第一の受孔の中心軸と上記予備中間素材15の中心軸とを一致させた状態でセットする。本実施例の場合、この予備中間素材15の軸方向一端部に上記テーパ部16を形成しているが、この予備中間素材15を上記第一の受孔内にセットする場合に、このテーパ部16をこの第一の受孔の開口側(一般的には上側)に位置させる。従って、上記予備中間素材15の軸方向に関して、上記テーパ部16と反対側に存在する円筒部が上記第一の受孔内に位置して、上記予備中間素材15の中心軸とこの第一の受孔の中心軸とを精度良く一致させ易い。そして、この予備中間素材15を、この第一の受孔の底面と、この第一の受孔内に押し込んだ押型の先端面との間で軸方向に圧縮し、得るべき上記タペットローラ8の外径aよりも少し大きな外径「a+△a」を有する、上記第一中間素材17とする。従って、図1の(C)の下面中央部に存在する平坦面は、同(B)の上端面に対応する面である。   In the case of the present embodiment, following the processing of the preliminary intermediate material 15, the first intermediate material 17 as shown in FIG. 1C is obtained by upsetting that compresses the preliminary intermediate material 15 in the axial direction. And In this case, the preliminary intermediate material 15 is provided in the first receiving mold and has a bottomed circular first having an inner diameter that is slightly larger than the outer diameter a of the tappet roller 8 to be obtained (by Δa). The center axis of the first receiving hole and the center axis of the preliminary intermediate material 15 are set in the receiving hole. In the case of the present embodiment, the tapered portion 16 is formed at one axial end portion of the preliminary intermediate material 15. However, when the preliminary intermediate material 15 is set in the first receiving hole, the tapered portion is formed. 16 is positioned on the opening side (generally the upper side) of the first receiving hole. Therefore, with respect to the axial direction of the preliminary intermediate material 15, a cylindrical portion that is on the opposite side of the tapered portion 16 is located in the first receiving hole, and the central axis of the preliminary intermediate material 15 and the first intermediate material 15. It is easy to match the center axis of the receiving hole with high accuracy. The preliminary intermediate material 15 is compressed in the axial direction between the bottom surface of the first receiving hole and the front end surface of the pressing die pushed into the first receiving hole, and the tappet roller 8 to be obtained is compressed. The first intermediate material 17 has an outer diameter “a + Δa” slightly larger than the outer diameter a. Therefore, the flat surface existing at the center of the lower surface of FIG. 1C is a surface corresponding to the upper end surface of FIG.

次いで、上記第一中間素材17の中心部を軸方向に圧縮すると共に、この圧縮により押し出された肉を周囲部分に逃がす後方押出加工により、図1の(D)に示す様な、上記第一中間素材17よりも大きな軸方向寸法を有する、有底円筒状の第二中間素材18を得る。この様な後方押し出し加工は、図2に示す様な後方押し出し加工装置により行なう。この後方押し出し加工装置は、円筒状のダイスユニット19の内周面と、このダイスユニット19の内側に下方から挿入したカウンターパンチ20の上端面と、同じく上方から挿入したパンチ21の下端面との間で、上記第一中間素材17の中心部を軸方向に圧縮する様に構成している。   Next, the center portion of the first intermediate material 17 is compressed in the axial direction, and the first extrusion as shown in FIG. 1D is performed by backward extrusion that releases the meat extruded by the compression to the surrounding portion. A bottomed cylindrical second intermediate material 18 having an axial dimension larger than that of the intermediate material 17 is obtained. Such a backward extrusion process is performed by a backward extrusion apparatus as shown in FIG. This rear extrusion processing apparatus includes an inner peripheral surface of a cylindrical die unit 19, an upper end surface of a counter punch 20 inserted from below into the inside of the die unit 19, and a lower end surface of a punch 21 also inserted from above. In the meantime, the center portion of the first intermediate material 17 is configured to be compressed in the axial direction.

上記ダイスユニット19は、主円筒部22と副円環部23とを、この副円環部23を下側にして、互いに同心に、上下に重ね合わせた状態で、円筒状のホルダ24内に保持して成る。このうちの主円筒部22は、上記第一中間素材17の外径「a+△a」よりも少しだけ小さく、造るべき上記タペットローラ8の外径aと一致する内径を有する。又、上記副円環部23は、上記主円筒部22の内径aよりも少し小さく、上記カウンターパンチ20を隙間なく挿通できる様に、このカウンターパンチ20の外径と同じか、この外径よりも僅かに大きな内径を有する。又、上記副円環部23の上端内周縁部には、断面形状が四分の一円弧状である、凹曲面部25を形成している。   The die unit 19 has a main cylindrical portion 22 and a sub-annular portion 23 placed in a cylindrical holder 24 in a state where the sub-annular portion 23 is on the lower side and are concentrically overlapped with each other. Hold it. Of these, the main cylindrical portion 22 is slightly smaller than the outer diameter “a + Δa” of the first intermediate material 17 and has an inner diameter that matches the outer diameter a of the tappet roller 8 to be manufactured. The sub-annular portion 23 is slightly smaller than the inner diameter a of the main cylindrical portion 22 and is the same as or larger than the outer diameter of the counter punch 20 so that the counter punch 20 can be inserted without a gap. Has a slightly larger inner diameter. In addition, a concave curved surface portion 25 having a cross-sectional shape of a quarter arc is formed at the inner peripheral edge at the upper end of the sub-annular portion 23.

一方、上記パンチ21のうちで、上記後方押し出し加工の進行に伴って上記第一中間素材17(第二中間素材18)の中心部に押し込まれる先端部は、造るべき上記タペットローラ8の内径cとほぼ一致する外径を有する。又、上記パンチ21の周囲には、円筒状の押圧スリーブ26を、このパンチ21に対する昇降を可能にして、外嵌している。この押圧スリーブ26の外径は、上記主円筒部22の内径以下として、この押圧スリーブ26の下端部をこの主円筒部22の上端部に挿入できる様にしている。この様な押圧スリーブ26は、その上半部を押圧ロッド44の下端部に結合したホルダ27に保持固定して、この押圧ロッド44により、下方に押圧可能としている。又、上記パンチ21はその上端部を、プレス加工機のラム28に結合固定して、このラム28の下降と共に、大きな力で下方に押圧される様にしている。上記押圧ロッド44は、このラム28とは独立した昇降を可能としている。   On the other hand, a tip portion of the punch 21 that is pushed into the central portion of the first intermediate material 17 (second intermediate material 18) as the backward extrusion process proceeds is an inner diameter c of the tappet roller 8 to be manufactured. And has an outer diameter that substantially matches. A cylindrical pressing sleeve 26 is fitted around the punch 21 so that the punch 21 can be moved up and down. The outer diameter of the pressing sleeve 26 is set to be equal to or smaller than the inner diameter of the main cylindrical portion 22 so that the lower end portion of the pressing sleeve 26 can be inserted into the upper end portion of the main cylindrical portion 22. Such a pressing sleeve 26 is held and fixed to a holder 27 coupled to the lower end of the pressing rod 44 at its upper half, and can be pressed downward by the pressing rod 44. The upper end of the punch 21 is coupled and fixed to a ram 28 of a press machine so that the ram 28 is pressed downward with a large force as the ram 28 is lowered. The pressing rod 44 can be moved up and down independently of the ram 28.

上述の様な後方押し出し加工装置により、上記第一中間素材17を上記第二中間素材18に加工する作業は、次の様にして行なう。先ず、図2の(A)に示す様に上記カウンターパンチ20を、このカウンターパンチ20の上端面が前記ダイスユニット19を構成する主円筒部22の上端開口部よりも少しだけ下側に位置する状態に迄上昇させた状態で、上記第一中間素材17を、上記主円筒部22の上端開口部に載置する。この第一中間素材17の外径「a+△a」は、この主円筒部22の内径よりも少し大きいので、そのままではこの主円筒部22の内側にまで全体が入り込む事はない。そこで、上記押圧ロッド44を下方に押圧する事により上記押圧スリーブ26を下降させ、この押圧スリーブ26の下端面により、上記第一中間素材17全体を上記主円筒部22内に押し込む。この状態で、この第一中間素材17の底面が上記カウンターパンチ20の上端面に当接して、この第一中間素材17の中心軸と上記主円筒部22の中心軸とが一致する。   The operation of processing the first intermediate material 17 into the second intermediate material 18 by the rear extrusion processing apparatus as described above is performed as follows. First, as shown in FIG. 2A, the counter punch 20 is positioned such that the upper end surface of the counter punch 20 is slightly below the upper end opening of the main cylindrical portion 22 constituting the die unit 19. The first intermediate material 17 is placed in the upper end opening of the main cylindrical portion 22 while being raised to the state. Since the outer diameter “a + Δa” of the first intermediate material 17 is slightly larger than the inner diameter of the main cylindrical portion 22, the whole does not enter the inside of the main cylindrical portion 22 as it is. Accordingly, the pressing sleeve 44 is lowered by pressing the pressing rod 44 downward, and the entire first intermediate material 17 is pushed into the main cylindrical portion 22 by the lower end surface of the pressing sleeve 26. In this state, the bottom surface of the first intermediate material 17 comes into contact with the upper end surface of the counter punch 20, and the central axis of the first intermediate material 17 and the central axis of the main cylindrical portion 22 coincide.

この様にして、上記第一中間素材17を上記後方押し出し加工装置にセットしたならば、図2の(B)に示す様に、上記カウンターパンチ20を、その上端面と前記凹曲面部25の下端縁とが一致する(上端面が凹曲面部25の接線方向に連続する)迄下降させつつ、上記ラム28を強く押し下げる。そして、このラム28により前記パンチ21の下端面を、上記第一中間素材17の上面中央部を強く押圧し、結果としてこの第一中間素材17を、上記カウンターパンチ20の上端面と上記パンチ21の下端面との間で、軸方向に強く押圧する。尚、上記押圧スリーブ26の下降は、前記ホルダ27の下面と前記ダイスユニット19の上端面とが当接した状態で停止する。   In this way, when the first intermediate material 17 is set in the backward extrusion processing apparatus, the counter punch 20 is formed on the upper end surface and the concave curved surface portion 25 as shown in FIG. The ram 28 is strongly pushed down while being lowered until it coincides with the lower end edge (the upper end surface continues in the tangential direction of the concave curved surface portion 25). Then, the lower end surface of the punch 21 is strongly pressed by the ram 28 against the central portion of the upper surface of the first intermediate material 17. As a result, the first intermediate material 17 is applied to the upper end surface of the counter punch 20 and the punch 21. Strongly pressed in the axial direction between the lower end surface of each other. The lowering of the pressing sleeve 26 stops when the lower surface of the holder 27 and the upper end surface of the die unit 19 are in contact with each other.

上記パンチ21の下端部の外径は、得るべき前記タペットローラ8の内径cとほぼ同じ(厳密に同じである必要はない)である。又、上記パンチ21を上記主円筒部22の内径側に挿入する際、上記押圧スリーブ26がこのパンチ21を案内する事により、これらパンチ21と主円筒部22との中心軸同士を一致させる。この様にして行なう、上記後方押出加工の結果、上記第一中間素材17の中心部の軸方向に関する厚さが縮まると共に、余肉部が外径寄り部分に逃げて、この外径寄り部分の軸方向寸法が大きくなり、図1の(D)に示す様な、上記第二中間素材18を得られる。この第二中間素材18は、得るべき上記タペットローラ8の外径aと同じ外径と、このタペットローラ8の内径cとほぼ同じ内径と、このタペットローラ8の軸方向長さbよりも大きな軸方向長さ「b+△b」とを有する。   The outer diameter of the lower end portion of the punch 21 is substantially the same as the inner diameter c of the tappet roller 8 to be obtained (it is not necessary to be exactly the same). Further, when the punch 21 is inserted into the inner diameter side of the main cylindrical portion 22, the pressing sleeve 26 guides the punch 21 so that the central axes of the punch 21 and the main cylindrical portion 22 coincide with each other. As a result of the backward extrusion performed in this way, the thickness of the central portion of the first intermediate material 17 in the axial direction is reduced, and the surplus portion escapes to the outer diameter portion, and the outer diameter portion The axial dimension is increased, and the second intermediate material 18 as shown in FIG. 1D is obtained. The second intermediate material 18 has an outer diameter that is the same as the outer diameter a of the tappet roller 8 to be obtained, an inner diameter that is substantially the same as the inner diameter c of the tappet roller 8, and is larger than the axial length b of the tappet roller 8. It has an axial length “b + Δb”.

次いで、この様にして得た、上記第二中間素材18に、この第二中間素材18の底部を打ち抜くピアス加工を施す。この際、この第二中間素材18の外周面及び底部外径寄り部分を、受型により抑えた状態で、この第二中間素材18の内側にパンチを押し込む。そして、この第二中間素材18の底部を、このパンチの先端面と上記受型との間で剪断して、図1の(E)に示す様な、円筒状の第三中間素材30を得る。尚、上述の図2に示した後方押し出し加工装置の場合には、前記副円環部23の上面内周縁部に前記凹曲面部25を設けている為、上記第二中間素材18を加工した状態で、この第二中間素材18の下端面外周縁部に、断面形状が四分の一円弧状の第一外径側曲面部29{図1の(D)参照}が形成される。但し、この第一外径側曲面部29は、上記第二中間素材18を上記第三中間素材30に加工する際に、上記底部を打ち抜く作業と同時に行なっても良い。   Next, the second intermediate material 18 obtained in this way is subjected to piercing processing that punches out the bottom of the second intermediate material 18. At this time, the punch is pushed into the second intermediate material 18 in a state where the outer peripheral surface of the second intermediate material 18 and the portion near the outer diameter of the bottom portion are suppressed by the receiving mold. Then, the bottom of the second intermediate material 18 is sheared between the front end surface of the punch and the receiving die to obtain a cylindrical third intermediate material 30 as shown in FIG. . In the case of the rear extrusion processing apparatus shown in FIG. 2, the second intermediate material 18 is processed because the concave curved surface portion 25 is provided on the inner peripheral edge of the upper surface of the sub-annular portion 23. In this state, a first outer-diameter-side curved surface portion 29 {see FIG. 1 (D)} having a cross-sectional arc shape of a quarter is formed on the outer peripheral edge portion of the lower end surface of the second intermediate material 18. However, the first outer diameter side curved surface portion 29 may be performed simultaneously with the operation of punching out the bottom portion when the second intermediate material 18 is processed into the third intermediate material 30.

何れにしても、上記第三中間素材30を得たならば、次いで、この第三中間素材30の軸方向寸法を、完成後のタペットローラ8の軸方向寸法bに迄正確に縮める、内径余肉出し加工を行なう。この内径余肉出し加工は、図3に示す様に、受型31に形成した凹孔32の内周面により上記第三中間素材30の外周面を抑え、この第三中間素材30の外径が拡がるのを防止しつつ、上記凹孔32の底面とパンチ33の先端面との間でこの第三中間素材30を軸方向両側から強く押圧する事により行なう。上記凹孔32の内径は、得るべき上記タペットローラ8の外径aと同じ寸法である。又、互いに対向する、上記凹孔32の底面と上記パンチ33の先端面との中央部には、それぞれ円すい台状の凸部34a、34bが形成されている。これら両凸部34a、34bの先端面は、上記内径余肉出し加工が終了するまで、当接する事はない。又、この内径余肉出し加工を終了する際に於ける、上記凹孔32の底面及び上記パンチ33の先端面の外径寄りに存在する平坦面35a、35b同士の間隔D35は、得るべき上記タペットローラ8の軸方向寸法bに一致する様に、厳密に規制している。又、上記両平坦面35a、35bの内径R35は、得るべき上記タペットローラ8の内径cと一致若しくは僅かに小さく(R35≦c)している。 In any case, once the third intermediate material 30 is obtained, the axial dimension of the third intermediate material 30 is then accurately reduced to the axial dimension b of the tappet roller 8 after completion. Perform meat processing. As shown in FIG. 3, the inner diameter surplus processing is performed by suppressing the outer peripheral surface of the third intermediate material 30 by the inner peripheral surface of the recessed hole 32 formed in the receiving die 31, and the outer diameter of the third intermediate material 30. The third intermediate material 30 is strongly pressed from both sides in the axial direction between the bottom surface of the concave hole 32 and the front end surface of the punch 33 while preventing the spread of the crack. The inner diameter of the concave hole 32 is the same as the outer diameter a of the tappet roller 8 to be obtained. Further, conical convex portions 34a and 34b are formed at the center portions of the bottom surface of the concave hole 32 and the tip surface of the punch 33, which face each other. The tip surfaces of both convex portions 34a and 34b do not contact until the inner diameter surplus machining is completed. In addition, when the inner diameter surplus machining is finished, a distance D 35 between the flat surfaces 35a and 35b existing near the outer diameter of the bottom surface of the concave hole 32 and the tip surface of the punch 33 should be obtained. It is strictly regulated so as to coincide with the axial dimension b of the tappet roller 8. The inner diameter R 35 of both the flat surfaces 35a, 35b is equal to or slightly smaller than the inner diameter c of the tappet roller 8 to be obtained (R 35 ≦ c).

上述の様にして行なう内径余肉出し加工の際、上記第三中間素材30の軸方向寸法が縮まる事に伴って生じる余肉に基づき、内周面が凸曲面状に膨出する。そして、図1の(F)に示す様な第四中間素材36を得られる。尚、本実施例の場合には、この第四中間素材36の内周面の一端寄り部分{図1の(F)の下端寄り部分}に、円筒面部37及び第二内径側曲面部39を形成している。この第二内径側曲面部39を形成する為に、上記凹孔32の底面中央部に形成した凸部34aの基部に、外径が変化しないストレート部を設け、上記円筒面部37を拘束している。又、第二外径側曲面部38を形成する為に、図1の(E)から(F)に示した状態で、中間素材の軸方向位置を反転させている。尚、本実施例の場合には、上記凹孔32の底面に存在する平坦面35aの内外両周縁部、及び、上記パンチ33の先端面に設けた平坦面35bの内周縁部に湾曲面を、それぞれ全周に亙り形成している。これら各湾曲面はそれぞれ、完成後のタペットローラ8の内外両周面と軸方向他端面{図1の(H)の下端面}とを連続させる第二外径側曲面部38及び第二内径側曲面部39と、内周面と軸方向一端面とを連続させる第一内径側曲面部40を加工する為に設けている。加工後の上記第四中間素材36は、前記受型31に設けた複数本の取り出しピン(図示せず)の突き上げにより、上記凹孔32から取り出す。   When the inner diameter surplus machining is performed as described above, the inner peripheral surface bulges into a convex curved surface based on the surplus generated as the axial dimension of the third intermediate material 30 shrinks. And the 4th intermediate material 36 as shown to (F) of FIG. 1 is obtained. In the case of the present embodiment, the cylindrical surface portion 37 and the second inner diameter side curved surface portion 39 are provided on a portion near one end of the inner peripheral surface of the fourth intermediate material 36 (portion near the lower end in FIG. 1F). Forming. In order to form the second inner diameter side curved surface portion 39, a straight portion whose outer diameter does not change is provided at the base of the convex portion 34a formed at the center of the bottom surface of the concave hole 32, and the cylindrical surface portion 37 is restrained. Yes. Further, in order to form the second outer diameter side curved surface portion 38, the axial direction position of the intermediate material is reversed in the state shown in FIGS. In the case of the present embodiment, curved surfaces are provided on both the inner and outer peripheral edges of the flat surface 35 a existing on the bottom surface of the concave hole 32 and the inner peripheral edge of the flat surface 35 b provided on the tip surface of the punch 33. Each is formed over the entire circumference. Each of these curved surfaces is a second outer diameter side curved surface portion 38 and a second inner diameter that make the inner and outer peripheral surfaces of the completed tappet roller 8 and the other axial end surface {the lower end surface of FIG. The side curved surface portion 39 is provided for processing the first inner diameter side curved surface portion 40 that makes the inner peripheral surface and the one axial end surface continuous. The processed fourth intermediate material 36 is taken out from the concave hole 32 by pushing up a plurality of take-out pins (not shown) provided in the receiving die 31.

上述の様にして得られた第四中間素材36に、次いで、内径扱き加工を施す。この内径扱き加工では、この第四中間素材36の外周面をダイにより抑え付けて外径が拡がらない様にした状態で、この第四中間素材36の中心孔43に扱き治具(金型)を押し込む。この扱き治具の外径は、得るべき上記タペットローラ8の内径cと一致している。又、この扱き治具の中心軸と上記ダイの中心軸とは、厳密に一致させている。上記内径扱き加工では、この様な扱き治具により上記第四中間素材36の内径寄り部分を、軸方向一端から他端に{図1の(F)の上から下に}向けて扱く事により、この第四中間素材36のうちで、得るべき上記タペットローラ8の容積を上回る余肉部分(主として内径側に膨出した部分)を、内周面の他端部分に寄せ集める。この時、軸方向寸法が変化しない様に、上記第四中間素材36の上端面にクッション圧を付加しても良い。この様な内径扱き加工の結果、図1の(G)に示す様な、内周面を外周面と同心の円筒面とし、この内周面の軸方向他端寄り{図1の(G)の下寄り}部分に内向フランジ状の余肉部41を備えた、第五中間素材42を得る。尚、上記内径扱き加工と同時に、上記第二外径側曲面部38及び第二内径側曲面部39の再加工作業(加工の進行に伴って崩れた形状の矯正)を行なっても良い。   The fourth intermediate material 36 obtained as described above is then subjected to inner diameter handling. In this inner diameter handling process, the outer peripheral surface of the fourth intermediate material 36 is held by a die so that the outer diameter does not expand, and a handling jig (die) is inserted into the center hole 43 of the fourth intermediate material 36. ). The outer diameter of the handling jig coincides with the inner diameter c of the tappet roller 8 to be obtained. The central axis of the handling jig and the central axis of the die are strictly matched. In the inner diameter handling processing, the portion closer to the inner diameter of the fourth intermediate material 36 is handled from one end to the other end in the axial direction {from above to below (F) in FIG. 1} with such a handling jig. Thus, in the fourth intermediate material 36, the surplus portion (mainly the portion that bulges toward the inner diameter side) exceeding the capacity of the tappet roller 8 to be obtained is gathered to the other end portion of the inner peripheral surface. At this time, a cushion pressure may be applied to the upper end surface of the fourth intermediate material 36 so that the axial dimension does not change. As a result of such inner diameter processing, as shown in FIG. 1G, the inner peripheral surface is a cylindrical surface concentric with the outer peripheral surface, and the inner peripheral surface is close to the other end in the axial direction {FIG. A fifth intermediate material 42 having an inward flange-shaped surplus portion 41 at the lower portion is obtained. At the same time as the inner diameter handling processing, the second outer diameter side curved surface portion 38 and the second inner diameter side curved surface portion 39 may be reworked (correction of the shape collapsed as the processing proceeds).

この様な第五中間素材42を得たならば、最後に、上記余肉部41をピアス加工により除去する。このピアス加工では、上記第五中間素材42の中心孔43aの内径R43(=上記タペットローラ8の内径c)と一致する外径を有するパンチをこの中心孔43a内に挿入する。そして、このパンチの先端面と受型との間で、上記余肉部41の基端部(外周縁部)を剪断する。この様にして行なうピアス加工により、円筒状の上記タペットローラ8が得られる。尚、上記ピアス加工と同時に、上記第二外径側曲面部38の再加工作業(加工の進行に伴って崩れた形状の矯正)を行なっても良い。
この様なタペットローラ8は、必要とする熱処理やバレル加工等の表面加工を施してから、前述の図5〜6に示した様なカムフォロア装置に組み込む。
When such a fifth intermediate material 42 is obtained, finally, the surplus portion 41 is removed by piercing. In this piercing process, a punch having an outer diameter coinciding with the inner diameter R 43 (= the inner diameter c of the tappet roller 8) of the center hole 43a of the fifth intermediate material 42 is inserted into the center hole 43a. And the base end part (outer peripheral part) of the said surplus part 41 is sheared between the front end surface of this punch, and a receiving die. The cylindrical tappet roller 8 is obtained by piercing performed in this manner. At the same time as the piercing process, the second outer diameter side curved surface portion 38 may be reworked (correction of the shape collapsed as the machining progresses).
Such a tappet roller 8 is subjected to necessary surface treatment such as heat treatment and barrel processing, and then incorporated into the cam follower as shown in FIGS.

尚、上述の実施例1の場合には、円形の第一中間素材17を有底円筒状の第二中間素材18とする押出加工として、後方押出加工を採用している。但し、この押出加工は、上記第一中間素材17を塑性変形させて上記第二中間素材18にできるものであれば良く、図4に示す様な、前方押出加工を採用する事もできる。前方押出加工を採用する場合には、カウンターパンチ20aの外径を後方押出加工の場合よりも小さくし、パンチ21aの外径を後方押出加工の場合よりも大きくする。そして、これらカウンターパンチ20aとパンチ21aとの押し付け合いに伴って、上記第一中間素材17の外径寄り部分を、このカウンターパンチ20aの外周面とダイスユニット19の内周面との間に進入させる。加工後の第二中間素材18は、上記カウンターパンチ20aの周囲に配設した排出スリーブ45を上昇させる事により、このカウンターパンチ20aの周囲から取り出し、前述の図1の(E)に示した次の工程に送る。   In the case of Example 1 described above, a backward extrusion process is employed as an extrusion process in which the circular first intermediate material 17 is used as the bottomed cylindrical second intermediate material 18. However, this extrusion process only needs to be able to plastically deform the first intermediate material 17 to form the second intermediate material 18, and forward extrusion as shown in FIG. 4 can also be adopted. When the forward extrusion process is employed, the outer diameter of the counter punch 20a is made smaller than that in the backward extrusion process, and the outer diameter of the punch 21a is made larger than that in the backward extrusion process. As the counter punch 20a and the punch 21a are pressed against each other, a portion closer to the outer diameter of the first intermediate material 17 enters between the outer peripheral surface of the counter punch 20a and the inner peripheral surface of the die unit 19. Let The processed second intermediate material 18 is taken out from the periphery of the counter punch 20a by raising the discharge sleeve 45 disposed around the counter punch 20a, and the second intermediate material 18 shown in FIG. To the process.

上述の様な前方押出加工の場合には、上記第一中間素材17の外径寄り部分を円筒状に加工する部分である、上記カウンターパンチ20aの上端部外周面と上記ダイスユニット19の内周面とが、何れも加工時に静止したままの状態に止まる。この為、得られる上記第二中間素材18の円筒部の内周面と外周面との精度、特に同軸度を良好にできて、得られるタペットローラの外周面の回転振れ精度を良好にできる。尚、前方押出加工を採用した場合には、上記第二中間素材18が、図1の(D)とは上下反転した状態で得られるので、この図1の(D)から同じく(E)に示す工程に移送する途中で、上記第二中間素材18を上下反転させる。   In the case of forward extrusion as described above, the outer peripheral surface of the upper end of the counter punch 20a and the inner periphery of the die unit 19 are portions that are processed into a cylindrical shape in the portion closer to the outer diameter of the first intermediate material 17. Both surfaces remain stationary during processing. For this reason, the accuracy of the inner peripheral surface and the outer peripheral surface of the cylindrical portion of the second intermediate material 18 to be obtained, particularly the coaxiality can be improved, and the rotational shake accuracy of the outer peripheral surface of the obtained tappet roller can be improved. When the forward extrusion process is adopted, the second intermediate material 18 is obtained in an upside down state with respect to (D) in FIG. 1, so from (D) in FIG. 1 to (E). The second intermediate material 18 is turned upside down during the transfer to the process shown.

本発明の実施例の加工工程を順番に示す断面図。Sectional drawing which shows the manufacturing process of the Example of this invention in order. 第一中間素材を第二中間素材とする、後方押し出し加工の実施状態を、加工開始前と加工終了時の状態とで示す断面図。Sectional drawing which shows the implementation state of the back extrusion process which uses a 1st intermediate material as a 2nd intermediate material before the process start and the state at the time of a process end. 第三中間素材を第四中間素材とする、余肉出し加工の実施状況を示す断面図。Sectional drawing which shows the implementation status of the surplus surfacing process which uses a 3rd intermediate material as a 4th intermediate material. 第一中間素材を第二中間素材とする、前方押し出し加工の実施状態を、加工開始前と加工終了時の状態とで示す断面図。Sectional drawing which shows the implementation state of the front extrusion process which uses a 1st intermediate material as a 2nd intermediate material before the process start and the state at the time of completion | finish of a process. 本発明の対象となるタペットローラを組み込んだカムフォロア装置の1例を示す側面図。The side view which shows an example of the cam follower apparatus incorporating the tappet roller used as the object of this invention. 図5の拡大A−A断面図。FIG. 6 is an enlarged AA sectional view of FIG. 5.

符号の説明Explanation of symbols

1 ロッカーアーム
2 軸孔
3 ロッカー軸
4 アジャストボルト
5 ロックナット
6 機関弁
7 弁ばね
8 タペットローラ
9 ローラ支持軸
10 支持壁
11 ニードル
12 カム
13 カム軸
14 ビレット
15 予備中間素材
16 テーパ部
17 第一中間素材
18 第二中間素材
19 ダイスユニット
20、20a カウンターパンチ
21、21a パンチ
22 主円筒部
23 副円環部
24 ホルダ
25 凹曲面部
26 押圧スリーブ
27 ホルダ
28 ラム
29 第一外径側曲面部
30 第三中間素材
31 受型
32 凹孔
33 パンチ
34a、34b 凸部
35a、35b 平坦面
36 第四中間素材
37 円筒面部
38 第二外径側曲面部
39 第二内径側曲面部
40 第一内径側曲面部
41 余肉部
42 第五中間素材
43、43a 中心孔
44 押圧ロッド
45 排出スリーブ
DESCRIPTION OF SYMBOLS 1 Rocker arm 2 Shaft hole 3 Rocker shaft 4 Adjustment bolt 5 Lock nut 6 Engine valve 7 Valve spring 8 Tappet roller 9 Roller support shaft 10 Support wall 11 Needle 12 Cam 13 Cam shaft 14 Billet 15 Preliminary intermediate material 16 Tapered portion 17 First Intermediate material 18 Second intermediate material 19 Dice unit 20, 20a Counter punch 21, 21a Punch 22 Main cylindrical portion 23 Sub-annular portion 24 Holder 25 Recessed curved surface portion 26 Pressing sleeve 27 Holder 28 Ram 29 First outer diameter side curved surface portion 30 Third intermediate material 31 Receiving mold 32 Recessed hole 33 Punch 34a, 34b Protruding portion 35a, 35b Flat surface 36 Fourth intermediate material 37 Cylindrical surface portion 38 Second outer diameter side curved surface portion 39 Second inner diameter side curved surface portion 40 First inner diameter side Curved surface part 41 Surplus part 42 Fifth intermediate material 43, 43a Center hole 44 Press Head 45 discharge sleeve

Claims (3)

  1. 金属製で円柱状のビレットを軸方向に圧縮して得た、円形の第一中間素材の中心部を軸方向に圧縮し、この中心部の軸方向寸法を縮める押出加工により、有底円筒状の第二中間素材とした後、この第二中間素材の底部を打ち抜く事により、造るべきタペットローラの容積よりも大きな容積を有する円筒状の第三中間素材とし、この第三中間素材の外周面を金型により外径が拡大しない様に拘束すると共に、内周面の少なくとも一部を拘束しない状態で上記第三中間素材を軸方向に圧縮する事により、軸方向寸法が上記タペットローラの軸方向寸法と一致し、このタペットローラの容積を上回る余肉部分を上記内周面を径方向に膨らませる方向に逃がした第四中間素材とした後、この第四中間素材の外周面を拘束した状態でこの第四中間素材の内径側に上記タペットローラの内径と一致する外径を有する扱き治具を押し込む事により、上記余肉部分を内周面の軸方向一部から径方向内方に突出する内向フランジ状部分に集めて第五中間素材とした後、この内向フランジ状部分を除去して、内径、外径、軸方向長さを規制値とした円筒状のタペットローラとする、タペットローラの製造方法。   A cylindrical cylinder with a bottom by extruding to compress the central part of a circular first intermediate material obtained by compressing a cylindrical billet made of metal in the axial direction, and reducing the axial dimension of this central part. After the second intermediate material is formed, the bottom of the second intermediate material is punched to obtain a cylindrical third intermediate material having a volume larger than the volume of the tappet roller to be manufactured. The third intermediate material is compressed in the axial direction without restraining at least a part of the inner peripheral surface by the mold so that the outer diameter is not enlarged, so that the axial dimension is the axis of the tappet roller. After making the surplus portion that coincides with the direction dimension and exceeds the volume of the tappet roller into the fourth intermediate material that escapes in the direction of expanding the inner peripheral surface in the radial direction, the outer peripheral surface of the fourth intermediate material is restrained. Of this fourth intermediate material in state By pushing a handling jig having an outer diameter coinciding with the inner diameter of the tappet roller into the radial side, the surplus portion is collected in an inward flange-like portion protruding inward in the radial direction from a part of the inner peripheral surface in the axial direction. Then, after the fifth intermediate material is formed, the inward flange-shaped portion is removed to obtain a cylindrical tappet roller having inner diameter, outer diameter, and axial length as regulation values.
  2. 第一中間素材をタペットローラに迄加工する過程で、外周面と軸方向一端面とを連続させる第一外径側曲面部と、外周面と軸方向他端面とを連続させる第二外径側曲面部と、内周面と軸方向一端面とを連続させる第一内径側曲面部と、内周面と軸方向他端面とを連続させる第二内径側曲面部とを形成する、請求項1に記載したタペットローラの製造方法。   In the process of processing the first intermediate material up to the tappet roller, the first outer diameter side curved surface portion that continues the outer peripheral surface and the one axial end surface, and the second outer diameter side that continues the outer peripheral surface and the other axial end surface The curved surface portion, a first inner diameter side curved surface portion that connects the inner peripheral surface and the one axial end surface, and a second inner diameter side curved surface portion that connects the inner peripheral surface and the other axial end surface are formed. The manufacturing method of the tappet roller described in 2.
  3. 第一中間素材の外径を、造るべきタペットローラの外径よりも大きくし、この第一中間素材を第二中間素材とする押出加工時に、内径を適正寸法としたダイスの内周面でこの第一中間素材の外周を扱く事により、この押出加工により得られる第二中間素材の外径を、上記タペットローラの外径に一致する上記適正寸法とし、その後に行なう加工を、各段階での素材を、それぞれの内径をこの適正寸法とした別のダイスの内径側に保持した状態で行なう、請求項1〜2のうちの何れか1項に記載したタペットローラの製造方法。   The outer diameter of the first intermediate material is made larger than the outer diameter of the tappet roller to be manufactured, and this extrusion is performed with the first intermediate material as the second intermediate material. By handling the outer periphery of the first intermediate material, the outer diameter of the second intermediate material obtained by this extrusion process is set to the appropriate dimension that matches the outer diameter of the tappet roller, and the subsequent processing is performed at each stage. The tappet roller manufacturing method according to claim 1, wherein the material is held in a state where each inner diameter is held on the inner diameter side of another die having an appropriate inner diameter.
JP2005259159A 2005-09-07 2005-09-07 Tappet roller manufacturing method Active JP4760242B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009279611A (en) * 2008-05-22 2009-12-03 Nsk Ltd Method for manufacturing cylindrical ring member
JP2010172935A (en) * 2009-01-29 2010-08-12 Nsk Ltd Method for removing excessive metal part in metallic cylindrical member, and punch for removing excessive metal part
JP2011085072A (en) * 2009-10-15 2011-04-28 Suzuki Motor Corp Variable valve gear
CN102274922A (en) * 2011-02-01 2011-12-14 魏一波 Cold heading manufacturing method for tappet for internal combustion engine
CN103212947A (en) * 2013-04-18 2013-07-24 深圳市富泰和精密制造有限公司 Processing method of valve lifter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0489153A (en) * 1990-07-30 1992-03-23 Daido Steel Co Ltd Cold and warm forging method for cylindrical body
JPH1085890A (en) * 1996-09-19 1998-04-07 O S Tec:Kk Warm or hot longitudinally simultaneous extrusion high speed type forging method and device
JP2000094080A (en) * 1998-09-17 2000-04-04 Nippon Koshuha Steel Co Ltd Production of ring shaped part
JP2001334344A (en) * 2000-05-23 2001-12-04 Masahiro Matsui Scrap-less manufacturing method of hollow member, apparatus thereof, and manufacturing method of washer
JP2004346760A (en) * 2003-05-20 2004-12-09 Nsk Ltd Cam follower device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0489153A (en) * 1990-07-30 1992-03-23 Daido Steel Co Ltd Cold and warm forging method for cylindrical body
JPH1085890A (en) * 1996-09-19 1998-04-07 O S Tec:Kk Warm or hot longitudinally simultaneous extrusion high speed type forging method and device
JP2000094080A (en) * 1998-09-17 2000-04-04 Nippon Koshuha Steel Co Ltd Production of ring shaped part
JP2001334344A (en) * 2000-05-23 2001-12-04 Masahiro Matsui Scrap-less manufacturing method of hollow member, apparatus thereof, and manufacturing method of washer
JP2004346760A (en) * 2003-05-20 2004-12-09 Nsk Ltd Cam follower device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009279611A (en) * 2008-05-22 2009-12-03 Nsk Ltd Method for manufacturing cylindrical ring member
JP2010172935A (en) * 2009-01-29 2010-08-12 Nsk Ltd Method for removing excessive metal part in metallic cylindrical member, and punch for removing excessive metal part
JP2011085072A (en) * 2009-10-15 2011-04-28 Suzuki Motor Corp Variable valve gear
CN102274922A (en) * 2011-02-01 2011-12-14 魏一波 Cold heading manufacturing method for tappet for internal combustion engine
CN103212947A (en) * 2013-04-18 2013-07-24 深圳市富泰和精密制造有限公司 Processing method of valve lifter

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