JP2620965B2 - Method of manufacturing V-shaped block for endless metal belt - Google Patents
Method of manufacturing V-shaped block for endless metal beltInfo
- Publication number
- JP2620965B2 JP2620965B2 JP29152488A JP29152488A JP2620965B2 JP 2620965 B2 JP2620965 B2 JP 2620965B2 JP 29152488 A JP29152488 A JP 29152488A JP 29152488 A JP29152488 A JP 29152488A JP 2620965 B2 JP2620965 B2 JP 2620965B2
- Authority
- JP
- Japan
- Prior art keywords
- receiving surface
- shaped block
- inclined surfaces
- receiving
- endless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 A.発明の目的 （１） 産業上の利用分野 本発明は、車両の無段変速機等に用いられる無端金属
ベルト用Ｖ形ブロックの製造方法、特に、ＶプーリのＶ
溝内面に摺接する一対の傾斜面と、両傾斜面間に在って
無端ストリップの内周面を受ける受面とを有し、その受
面を、少なくとも無端ストリップ巻回方向の中央部を頂
部とする凸弧面に形成した金属製Ｖブロックを製造すべ
く、金属粉末を用いた圧粉体成形作業および圧粉体焼結
作業を経て、両傾斜面を有すると共に受面に対応する部
分を平坦面に形成された１次素材を得、次いで、一方の
成形型により１次素材の両傾斜面を同時に押圧して平坦
面を他方の成形型の凹弧状成形面に倣わせることにより
前記受面を成形された２次素材を得、その後、形状矯正
型の整形孔内で、両傾斜面および受面に隣接する２次素
材の両端面を狭圧して形状矯正作業を行うＶ形ブロック
の製造方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of the Invention The present invention relates to a method of manufacturing a V-shaped block for an endless metal belt used for a continuously variable transmission of a vehicle, and particularly to a method of manufacturing a V-pulley. V
It has a pair of inclined surfaces that are in sliding contact with the inner surface of the groove, and a receiving surface that is located between the two inclined surfaces and that receives the inner peripheral surface of the endless strip. In order to manufacture a metal V block formed on a convex arc surface, through a green compact forming operation and a green compact sintering operation using metal powder, a portion having both inclined surfaces and a portion corresponding to the receiving surface is formed. Obtaining a primary material formed on a flat surface, and then simultaneously pressing both inclined surfaces of the primary material with one molding die to cause the flat surface to conform to the concave arc-shaped molding surface of the other molding die. A V-shaped block in which a secondary material having a receiving surface formed thereon is obtained, and thereafter, both inclined surfaces and both end surfaces of the secondary material adjacent to the receiving surface are narrowed in a shaping hole of the shape correction type to perform a shape correcting operation. The present invention relates to an improvement in the production method of
（２） 従来の技術 受面を前記のように凸弧面に形成する理由は、無端金
属ベルトがＶプーリに摺接回動するとき無端ストリップ
に過大な張力が作用するのを防止することにあるが、前
記受面整形後２次素材を離型すると、その２次素材はス
プリングバックを生じるため、両傾斜面の傾き角が、完
成品のそれよりも若干拡大される。(2) Prior Art The reason why the receiving surface is formed as a convex arc surface as described above is to prevent an excessive tension from acting on the endless strip when the endless metal belt slides and rotates on the V pulley. However, when the secondary material is released after the receiving surface is shaped, the secondary material causes springback, so that the inclination angles of both inclined surfaces are slightly larger than that of the finished product.
そこで、前記形状矯正作業が必要となるが、従来は形
状矯正型における整形孔の形状を完成品のスプリングバ
ックを考慮してそれよりも若干小さく形成し、且つ受面
と対向する内面を平坦に形成して作業を行っている。こ
の場合、前記受面と対向する整形孔内面は、受面に対応
して凹弧面が良いが、矯正作業後Ｖ形ブロックを前記挟
圧方向に離型するため凹弧面に形成するとＶ形ブロック
の離型を行うことができなくなるので前記のように平坦
面に形成するものである。Therefore, it is necessary to perform the shape correction work, but conventionally, the shape of the shaping hole in the shape correction mold is formed slightly smaller in consideration of the springback of the finished product, and the inner surface facing the receiving surface is made flat. Forming and working. In this case, the inner surface of the shaping hole facing the receiving surface preferably has a concave arc surface corresponding to the receiving surface. However, if the V-shaped block is formed into a concave arc surface in order to release the V-shaped block in the clamping direction after the correction work, V Since the mold block cannot be released, it is formed on a flat surface as described above.
（３） 発明が解決しようとする課題 しかしながら、前記従来法においては、前記受面に整
形孔内面を近接させて形状矯正作業を行っているので、
両端面の挟圧に伴い受面が膨出変形すると、その受面が
整形孔内面に圧接してそれに倣い、凸弧の半径が設定値
よりも増大するという問題がある。(3) Problems to be Solved by the Invention However, in the conventional method, since the shape correcting work is performed by bringing the inner surface of the shaping hole close to the receiving surface,
When the receiving surface swells and deforms due to the pressure applied between the both end surfaces, the receiving surface comes into pressure contact with the inner surface of the shaping hole and follows the shaping hole, causing a problem that the radius of the convex arc becomes larger than a set value.
本発明は前記問題を解決することのできる前記Ｖ形ブ
ロックの製造方法を提供することを目的とする。An object of the present invention is to provide a method for manufacturing the V-shaped block, which can solve the above-mentioned problem.
B.発明の構成 （１） 課題を解決するための手段 本発明は、ＶプーリのＶ溝内面に摺接する一対の傾斜
面と、両傾斜面間に在って無端ストリップの内周面を受
ける受面とを有し、該受面を、少なくとも前記無端スト
リップ巻回方向の中央部を頂部とする凸弧面に形成した
金属製Ｖ形ブロックを製造すべく、金属粉末を用いた圧
粉体成形作業および圧粉体焼結作業を経て、両傾斜面を
有すると共に前記受面に対応する部分を平坦面に形成さ
れた１次素材を得、次いで、一方の成形型により前記１
次素材の両傾斜面を同時に押圧して前記平坦面を他方の
成形型の凹弧状成形面に倣わせることにより前記受面を
成形された２次素材を得、その後、形状矯正型の整形孔
内で、両傾斜面および受面に隣接する前記２次素材の両
端面を挟圧して形状矯正作業を行うＶ形ブロックの製造
方法において、前記挟圧に伴う前記受面の膨出変形時該
受面が、それと対向する前記整形孔内面に接触しないよ
うに、前記受面と前記整形孔内面との間に間隔を存して
前記形状矯正作業を行うことを特徴とする。B. Configuration of the Invention (1) Means for Solving the Problems The present invention receives a pair of inclined surfaces that are in sliding contact with the inner surface of a V-groove of a V-pulley, and receives the inner peripheral surface of an endless strip between the two inclined surfaces. Compacting using metal powder to produce a metal V-shaped block having a receiving surface and a convex surface having at least a central portion in the winding direction of the endless strip as a top. Through a molding operation and a green compact sintering operation, a primary material having both inclined surfaces and having a flat surface corresponding to the receiving surface is obtained.
By pressing both inclined surfaces of the next material at the same time to make the flat surface conform to the concave arc-shaped molding surface of the other molding die, a secondary material having the receiving surface molded is obtained, and thereafter, shaping of the shape correction mold is performed. In a method of manufacturing a V-shaped block in which a shape correcting operation is performed by squeezing both end surfaces of the secondary material adjacent to both inclined surfaces and a receiving surface in a hole, the swelling deformation of the receiving surface due to the squeezing pressure The shape correcting operation is performed with an interval between the receiving surface and the inner surface of the shaping hole so that the receiving surface does not contact the inner surface of the shaping hole facing the receiving surface.
（２） 作用 前記形状矯正作業によれば、受面が整形孔内面に倣う
ことがなく、したがって離型後のスプリングバックによ
り前記受面の凸弧は設定値またはそれに近似した半径を
持つ。(2) Operation According to the shape correcting operation, the receiving surface does not follow the inner surface of the shaping hole, and therefore, the convex arc of the receiving surface has a set value or a radius close to the set value due to the springback after the release.
（３） 実 施 例 第１〜第３図において、車両用無段変速機に用いられ
るベルト伝動機構１は矢印Ａ方向に回動する駆動Ｖプー
リ２と、その駆動Ｖプーリ２との間に所定の間隔を存し
て配設される従動Ｖプーリ３と、両Ｖプーリ2,3間に懸
張される無端金属ベルト４とよりなる。(3) Embodiment In FIGS. 1 to 3, a belt transmission mechanism 1 used in a continuously variable transmission for a vehicle is provided between a drive V pulley 2 that rotates in the direction of arrow A and the drive V pulley 2. It comprises a driven V pulley 3 disposed at a predetermined interval and an endless metal belt 4 suspended between the V pulleys 2 and 3.
無端金属ベルト４は、薄肉鋼板を積層してなる可撓性
無端ストリップ５と、無端ストリップ５の内周面に沿っ
て互いに近接して並ぶ複数の金属製Ｖ形ブロック６と、
各Ｖ形ブロック６に装着されてそのＶ形ブロック６を無
端ストリップ５に組付ける複数の金属製弾性ストッパ７
と、相隣る両Ｖ形ブロック６間に介装される複数の金属
製中空ローラ８とを備えている。The endless metal belt 4 includes a flexible endless strip 5 formed by laminating thin steel plates, a plurality of metal V-shaped blocks 6 arranged close to each other along the inner peripheral surface of the endless strip 5,
A plurality of metal elastic stoppers 7 mounted on each V-shaped block 6 and attaching the V-shaped block 6 to the endless strip 5
And a plurality of metal hollow rollers 8 interposed between the adjacent V-shaped blocks 6.
第４〜第７図に明示するように、Ｖ形ブロック６は鉄
系焼結体より構成されたもので、本体９と、その本体９
の、無端ストリップ５内周面と対向する受面10の両側に
突設されて無端ストリップ５の両側縁を挟む一対のスト
ッパ装着用突出部11とよりなる。両突出部11の外側面に
連なる本体９の両外側面は、駆動および従動Ｖプーリ2,
3のＶ溝ｇ内面全体に摺接し得るように傾斜面12に形成
され、また両傾斜面12および受面10に隣接する両端面ｆ
に、無端ストリップ５周面の母線に平行して延び、且つ
両端を閉じられた横断面略半環状をなすローラ保持溝13
が形成される。各突出部11の外側面基端に、無端ストリ
ップ５の周方向に延びる係合溝14が形成され、また各突
出部11に、その先端面から係合溝14に達する鉤形切欠き
15が形成される。As shown in FIGS. 4 to 7, the V-shaped block 6 is made of an iron-based sintered body, and includes a main body 9 and the main body 9.
A pair of stopper mounting projections 11 projecting from both sides of the receiving surface 10 facing the inner peripheral surface of the endless strip 5 and sandwiching both side edges of the endless strip 5. The two outer surfaces of the main body 9 connected to the outer surfaces of the two protrusions 11 are driven and driven V pulleys 2,
3 is formed on the inclined surface 12 so as to be able to slide on the entire inner surface of the V groove g, and both end surfaces f adjacent to both the inclined surface 12 and the receiving surface 10
A roller holding groove 13 extending parallel to the generatrix of the peripheral surface of the endless strip 5 and having a substantially semi-annular cross-section with both ends closed.
Is formed. An engagement groove 14 extending in the circumferential direction of the endless strip 5 is formed at the base end of the outer surface of each protrusion 11, and a hook-shaped notch is formed in each protrusion 11 to reach the engagement groove 14 from the distal end surface.
15 is formed.
ストッパ７は、中間に半環状膨出部分16を有する押え
部17と、押え部17の両端から膨出部分16を含む平面に対
し略直角に延びて相対向する一対の折曲げ部18と、両折
曲げ部18の先端から前記平面と平行に延びて相対向する
一対の係合部19とよりなる。押え部17はその両端を両切
欠き15の段部にそれぞれ係合して無端ストリップ５の外
周面に対向し、また各折曲げ部18は各段部外側面に係合
し、さらに各係合部19は各係合溝４に係合する。これに
よりＶ形ブロック６が無端ストリップ５に組付けられ
る。The stopper 7 includes a holding portion 17 having a semi-annular bulging portion 16 in the middle, a pair of bent portions 18 extending from both ends of the holding portion 17 at a substantially right angle to a plane including the bulging portion 16 and facing each other. It comprises a pair of engaging portions 19 extending from the front ends of both bent portions 18 in parallel with the plane and facing each other. The pressing portion 17 has both ends respectively engaged with the steps of the notches 15 to face the outer peripheral surface of the endless strip 5, and the bent portions 18 engage with the outer surfaces of the steps, respectively. The joint 19 engages with each engagement groove 4. As a result, the V-shaped block 6 is assembled to the endless strip 5.
前記無端金属ベルト４は、前記のように無端ストリッ
プ５にＶ形ブロック６を１個宛ストッパ７を用いて組付
け、その後相隣るＶ形ブロック６の両ローラ保持溝13間
に中空ローラ８を介装することによって製造される。The endless metal belt 4 is assembled with the V-shaped block 6 to the endless strip 5 by using the stopper 7 as described above, and then the hollow roller 8 is provided between the two roller holding grooves 13 of the adjacent V-shaped block 6. It is manufactured by interposing.
受面10は、矢印Ａで示す無端ストリップ巻回方向およ
びそれと直交する方向の中央部を頂部とする凸弧面に成
形されている。The receiving surface 10 is formed into a convex arc surface having a top portion at the center in the direction of winding the endless strip indicated by arrow A and in the direction perpendicular to the direction.
第７図に明示するように受面10において、無端ストリ
ップ巻回方向の前側および後側に位置する第1,第２端縁
e1,e2間を結ぶ凸弧a1の半径は、両Ｖプーリ2,3の最小半
径部を回動する無端ストリップ５の曲率半径よりも小さ
くなるように設定され、これにより無端金属ベルト４が
両Ｖプーリ2,3に摺接回動するとき無端ストリップ５に
過大な張力が作用することを防止してその耐久性の向上
が図られている。As clearly shown in FIG. 7, the first and second edges located on the front side and the rear side of the receiving surface 10 in the endless strip winding direction.
e 1, e 2 connecting the radius of the convex arcuate a 1 is set to the minimum radius portion of both V pulleys 2 and 3 to be smaller than the radius of curvature of the endless strips 5 which rotates, thereby endless metal belt The endless strip 5 is prevented from exerting an excessive tension when the slide 4 rotates in contact with the two V pulleys 2 and 3, thereby improving the durability.
また第６図に示すように受面10において、両突出部11
の基端に位置する第3,第４端縁e3,e4間を結ぶ凸弧a2は
無端ストリップ５とＶ形ブロック６内に相対回動があっ
た場合に無端ストリップ５を受面10の中央部に寄せる機
能を有する。In addition, as shown in FIG.
Third, convex arcuate a 2 connecting the fourth edge e 3, e 4 is receiving surfaces of the endless strip (5) Where a relative rotation to the endless strip 5 and V-shaped block 6 positioned on the proximal end It has the function of moving to the center of 10.
さらに第1,第２端縁e1,e2は、前記凸弧a1よりも曲率
半径の小さな凸弧面となるように面取りがなされてお
り、Ｖ形ブロック６の両端縁e1,e2が無端ストリップ５
に滑らかに摺接するようになっている。Further, the first and second edges e 1 and e 2 are chamfered so as to form a convex arc surface having a smaller radius of curvature than the convex arc a 1 , and both end edges e 1 and e of the V-shaped block 6 are formed. 2 is endless strip 5
It comes into sliding contact smoothly.
次に前記Ｖ形ブロック６の製造方法について説明す
る。その製造方法は、前記受面10に対応する部分を平坦
面に形成された１次素材を得る粉末冶金工程と、前記平
坦面を凸弧面に成形して２次素材を得る押圧成形工程
と、２次素材の形状を整える形状矯正工程とよりなる。Next, a method of manufacturing the V-shaped block 6 will be described. The manufacturing method includes a powder metallurgy step of obtaining a primary material having a flat surface at a portion corresponding to the receiving surface 10, and a press molding step of forming a secondary material by molding the flat surface into a convex arc surface. And a shape correcting step for adjusting the shape of the secondary material.
まず、第８図により粉末冶金工程について説明する。 First, the powder metallurgy process will be described with reference to FIG.
第８図（ｃ）は１次素材61を示し、その素材61におい
て、受面10に対応する部分は平坦面10aに形成され、ま
た第１〜第４端縁e1〜e4は鋭角になっている。これらの
点を除いて１次素材61は前記Ｖ形ブロック６と略同一形
状を有するので、同一部分には同一符号を付す。Figure 8 (c) shows the primary material 61, in the material 61, the portion corresponding to the receiving surface 10 is formed on the flat surface 10a, also the first to fourth edge e 1 to e 4 are It is sharp. Since the primary material 61 except for these points have the V-shaped block 6 and substantially the same shape, the same reference symbols are affixed to the same portions.
第８図（ａ）は圧粉体成形作業を示し、外型20のキャ
ビティ21に鉄系粉末を装入し、次いでポンチ22をキャビ
ティ21に嵌入して前記鉄系粉末を圧縮し圧粉体23を成形
する。FIG. 8 (a) shows a compacting operation, in which an iron-based powder is charged into the cavity 21 of the outer mold 20, and then a punch 22 is fitted into the cavity 21 to compress the iron-based powder and compact the compact. Form 23.
第８図（ｂ）は圧粉体23の焼結作業を示し、圧粉体23
を焼結炉24内に設置して加熱することにより焼結し、第
８図（ｃ）に示す鉄系焼結体よりなる１次素材61を得
る。FIG. 8 (b) shows the sintering operation of the green compact 23,
The sintered by heating installed in sintering furnace 24, to obtain 1 a primary material 61 made of iron-based sintered body shown in FIG. 8 (c).
次に第９〜第13図により押圧成形工程について説明す
る。Next, the press molding process will be described with reference to FIGS.
押圧成形装置25は、相互に開閉可能な一対の成形型を
有し、その一方の成形型は昇降自在な押圧ポンチ26であ
り、他方の成形型は押圧ポンチ26の下方に配設された固
定のダイス27である。The press forming device 25 has a pair of forming dies that can be opened and closed with each other, one of which is a press punch 26 which can be raised and lowered, and the other of which is a fixed press disposed below the press punch 26. The dice 27.
第9,第10図に明示するように、ダイス27は、１次素材
61をその平坦面10aを下向きにして嵌入し得る長方形の
保持孔28と、その保持孔28の底部に突設されて上端面を
前記受面10の凸弧面と対応する凹弧状成形面29に形成さ
れた成形突部30と、保持孔28の短辺側に位置する両内壁
31にそれぞれ開口させた一対のポンチガイド溝32とを有
する。保持孔28の両長辺側に位置する凹弧状成形面29の
両端縁331,332は、面取りのために両端縁間の曲率半径
よりも小さな半径の凹弧面に形成される。またダイス27
に、成形突部30を挟むように一対の貫通孔34が形成さ
れ、両貫通孔34にそれぞれノックアウトピン35が摺動自
在に嵌合される。As clearly shown in FIGS. 9 and 10, the die 27 is a primary material.
6 1 a rectangular holding holes 28 which may be fitted to the flat surface 10a downwardly, a concave arc-shaped molding surface is projected to the upper end surface to the bottom corresponding to the convex arcuate surface of the receiving surface 10 of the holding hole 28 Forming protrusion 30 formed on 29 and both inner walls located on the short side of holding hole 28
31 has a pair of punch guide grooves 32 opened respectively. Opposite edges 33 1, 33 2 of the concave arc-shaped molding surface 29 located on both long sides of the holding hole 28 is formed in the concave arc face of smaller radius than the radius of curvature across the edge for chamfering. Also die 27
In addition, a pair of through holes 34 are formed so as to sandwich the molding protrusion 30, and the knockout pins 35 are slidably fitted into the two through holes 34, respectively.
第9,第11図に示すように押圧ポンチ26は、保持孔28に
摺動自在に嵌合されるポンチ本体36と、そのポンチ本体
36の両側面に突設された一対のガイド部37とを有し、ポ
ンチ本体36の下面に１次素材61の両傾斜面12を押圧し得
る一対の傾斜内面38を持つ凹部39が開口しており、また
両ガイド部37は両ポンチガイド溝32にそれぞれ摺動自在
に嵌合されるようになっている。As shown in FIGS. 9 and 11, the pressing punch 26 includes a punch body 36 slidably fitted in the holding hole 28, and the punch body.
And a pair of guide portions 37 protruding from the both side surfaces 36, the recess 39 having a pair of inclined inner surface 38 capable of pressing the both inclined surfaces 12 of the primary material 61 to the lower surface of the punch body 36 is opened The guide portions 37 are slidably fitted in the punch guide grooves 32, respectively.
押圧ポンチ26において、両ガイド部37の側面にダイス
27の上面に当接して押圧ポンチ26の移動ストロークを規
制する規制部材40が設けられる。In the pressing punch 26, a die is
A regulating member 40 is provided, which abuts on the upper surface of 27 and regulates the movement stroke of the pressing punch 26.
押圧成形作業に当たっては、第９図に示すように押圧
ポンチ26を上昇させてダイス27より離間し、前記１次素
材61をその平坦面10aを下向きにして保持孔28に嵌入
し、平坦面10aを成形突部30の凹弧状成形面29に対向さ
せる。この場合、１次素材61は保持孔28に案内されるの
で、凹弧状成形面29に対する平坦面10aの位置決めが正
確に行われる。また両突出部11は両貫通孔34内に挿入さ
れるが、両ノックアウトピン35は下降位置にあって各ピ
ン35の先端面が各突出部11下端面より離間するようにな
っている。In the press forming work, thereby increasing the pressing punch 26, as shown in FIG. 9 away from the die 27, fitted to the primary material 61 in the holding hole 28 and the flat surface 10a downward, flat surface 10a is made to face the concave arc-shaped molding surface 29 of the molding protrusion 30. In this case, the primary material 61 is because it is guided by the holding hole 28, the positioning of the flat surface 10a with respect to a concave arc-shaped molding surface 29 is accurately performed. The two protrusions 11 are inserted into the two through holes 34, but the two knockout pins 35 are at the lowered position so that the front end surfaces of the pins 35 are separated from the lower end surfaces of the protrusions 11.
次いで、第12,第13図に示すように押圧ポンチ26を下
降させてポンチ本体36を保持孔28に、また両ガイド部37
を両ポンチガイド溝32にそれぞれ嵌入し、ポンチ本体36
の両傾斜内面38を１次素材61の両傾斜面12に合致させて
その素材61を押圧する。これにより１次素材61が塑性変
形されて、その平坦面10aが凹弧状成形面29に倣い前記
凸弧面に成形され、同時にその第1,第２端縁e1,e2が凹
弧面を持つ端縁331,332により凸弧面に成形されて面取
り加工を施される。以上により２次素材62が得られる。Next, as shown in FIGS. 12 and 13, the pressing punch 26 is lowered to move the punch body 36 into the holding hole 28,
Into the punch guide grooves 32 respectively, and the punch body 36
Both inclined inner surface 38 is matched to both the inclined surfaces 12 of the primary material 61 of pressing the material 6 1. This primary material 61 is plastically deformed by, the flat surface 10a is formed on the convex arcuate surface follows the concave arc-shaped molding surface 29, at the same time the first, second edges e 1, e 2 is concave arc is formed into a convex arc surface is subjected to chamfering by edges 33 1, 33 2 with the surface. Secondary material 6 2 is obtained by the above.
この場合、両傾斜面12は両傾斜内面38により押圧され
るので、それら傾斜面12の表面性が改善されると共にそ
れら傾斜面12および受面10の近傍が高密度化される。In this case, since the two inclined surfaces 12 are pressed by the two inclined inner surfaces 38, the surface properties of the inclined surfaces 12 are improved, and the densities near the inclined surfaces 12 and the receiving surface 10 are increased.
この時点で両規制部材40がダイス27の上端面に当接し
て押圧ポンチ26の移動ストロークが規制されるので、２
次素材62の過圧による寸法変化が確実に防止される。At this point, both the regulating members 40 abut on the upper end surface of the die 27 and the movement stroke of the pressing punch 26 is regulated.
Dimensional change due to overpressure in the following materials 6 2 is reliably prevented.
成形後押圧ポンチ26を上昇し、次いで両ノックアウト
ピン35を上昇して、２次素材62を保持孔28から排出す
る。この排出に伴い２次素材62はスプリングバックを生
じ、両傾斜面12の傾き角が完成品よりも若干拡大され
る。After molding pressing punch 26 rises, then raised both knockout pin 35, is discharged from the secondary material 6 2 holding hole 28. The discharge secondary material 6 2 with the results in springback, the inclination angle of the both inclined surfaces 12 is slightly larger than the finished product.
なお、２次素材62はＶ形ブロック６と略同一形状を有
するので、同一部分には同一符号を付してある。Incidentally, the secondary material 6 2 because it has a V-shaped block 6 and substantially the same shape, the same portions are denoted by the same reference numerals.
次に第14〜第16図により形状矯正工程について説明す
る。Next, the shape correcting step will be described with reference to FIGS.
形状矯正型41は、外型42と、上部ポンチ43と、下部ポ
ンチ44とを備え、それら上、下部ポンチ43,44は外型42
を貫通する整形孔45に摺動自在に嵌合される。整形孔45
は、２次素材62を、その両端面ｆをそれぞれ上、下方向
に向けて強制的に嵌入し得る形状を有し、また上、下部
ポンチ43,44はそれぞれ２次素材62の両ローラ保持溝13
に嵌合する突出部46,47を備えている。この場合、両ロ
ーラ保持溝13の中央部13a（第14図）への挟圧力をその
周囲のそれよりも増すため、両突出部46,47における前
記中央部13aとの対応部位がその周囲よりも若干突出し
ている。The shape correction mold 41 includes an outer mold 42, an upper punch 43, and a lower punch 44, and the lower punches 43 and 44 are provided on the outer mold 42.
Is slidably fitted in a shaping hole 45 penetrating through. Shaping hole 45
Is a secondary material 6 2, on the two end faces f, respectively, have a shape capable of forcibly fitted toward the downward direction, also on, the lower punch 43, 44 respectively secondary elements 6 2 both Roller holding groove 13
Are provided with protruding portions 46 and 47 to be fitted into. In this case, since the pressing force of the roller holding grooves 13 on the central portion 13a (FIG. 14) is increased more than that of the surrounding portions, the corresponding portions of the both protruding portions 46 and 47 with the central portion 13a are closer than the surrounding portions. Are also slightly protruding.
２次素材62の形状矯正に当っては、上部ポンチ43によ
り次素材62を整形孔45内に強制的に嵌入し、また上、下
部ポンチ43,44により２次素材62の両端面ｆを挟圧し
て、押圧成形後２次素材62に生じたスプリングバックに
伴う両傾斜面12の傾き角を矯正する。Is hitting the secondary material 6 2 straightening forcibly fitted the following materials 6 2 in the shaping hole 45 by the upper punch 43, also on both end faces of the secondary material 6 2 by the lower punch 43 and 44 and nipped the f, to correct the inclination angle of the both inclined surfaces 12 due to the spring back generated in press forming after the second material 6 2.
前記挟圧過程で、２次素材62における両ローラ保持溝
13の中央部分13aがその周囲よりも強く強圧されるた
め、第16図鎖線示のように２次素材62の受面10が膨出変
形する。In about the clamping-pressure, the rollers hold the groove in the secondary material 6 2
Since the central portion 13a of the 13 it is strongly strongly pressed than its surroundings, the receiving surface 10 of the secondary material 6 2 as shown in Fig. 16 chain line bulges deformed.
本発明においては、前記膨出変形時、受面10が、それ
と対向する整形孔45の内面48に接触しないように、その
内面48と膨出変形した受面10との間に間隔ｄが存するよ
うにしている。In the present invention, at the time of the bulging deformation, there is a gap d between the inner surface 48 and the bulging deformed receiving surface 10 so that the receiving surface 10 does not contact the inner surface 48 of the shaping hole 45 facing the bulging deformation. Like that.
前記間隔ｄは、前記内面48およびそれに対向する内面
49間の長さl1と、受面10の頂部およびそれと反対側の外
面50間の長さl2との差Δｌを、押圧成形時の押圧代より
も大に設定することにより得られる。The interval d is the inner surface 48 and the inner surface opposed thereto.
It can be obtained by setting the difference Δl between the length l 1 between 49 and the length l 2 between the top of the receiving surface 10 and the outer surface 50 on the opposite side thereof to be larger than the press allowance in press forming.
このような形状矯正作業を行うと、受面10が整形孔45
の内面48に倣うことがなく、したがって離型後のスプリ
ングバックにより受面10の凸弧は設定値またはそれに近
似した半径を持つ。When such a shape correcting operation is performed, the receiving surface 10 is formed into the shaping hole 45.
Therefore, the convex arc of the receiving surface 10 has a set value or a radius close to the set value due to the springback after the mold release.
C.発明の効果 本発明によれば、極めて簡単な手法を採用することに
よって、受面の寸法精度を向上させた前記Ｖ形ブロック
を提供することができる。C. Effects of the Invention According to the present invention, it is possible to provide the V-shaped block in which the dimensional accuracy of the receiving surface is improved by employing a very simple method.
第１〜第３図はベルト伝動機構を示し、第１図は全体斜
視図、第２図は無端金属ベルトの部分斜視図、第３図は
無端金属ベルトの部分側面図、第４〜第７図はＶ形ブロ
ックを示し、第４図はＶ形ブロックとストッパとの関係
を示す斜視図、第５図はＶ形ブロックの側面図、第６図
は第５図VI−VI線断面図、第７図は第６図VII−VII線断
面図、第８図は１次素材を得るための粉末冶金工程説明
図、第９〜第13図は２次素材を得るための押圧成形工程
を示し、第９図は作業前における押圧成形装置の縦断面
図、第10図は第９図Ｘ−Ｘ矢視図、第11図は押圧ポンチ
の部分斜視図、第12図は作業中における押圧成形装置の
縦断面図、第13図は第12図XIII−XIII線断面図、第14〜
第16図はＶ形ブロックを得るための形状矯正工程を示
し、第14図は外型の断面図で、第15図XIV−XIV線断面図
に対応し、第15図は第14図XV−XV線断面図、第16図は２
次素材と整形孔との関係を示す説明図である。 ｄ……間隔、ｇ……Ｖ溝、2,3……駆動、従動Ｖプー
リ、５……無端ストリップ、６……Ｖ形ブロック、61,6
2……1,2次素材、10……受面、10a……平坦面、12……
傾斜面、26……押圧ポンチ（成形型）、27……ダイス
（成形型）、41……形状矯正型、45……整形孔、48……
内面1 to 3 show a belt transmission mechanism, FIG. 1 is an overall perspective view, FIG. 2 is a partial perspective view of an endless metal belt, FIG. 3 is a partial side view of an endless metal belt, and FIGS. The figure shows a V-shaped block, FIG. 4 is a perspective view showing the relationship between the V-shaped block and the stopper, FIG. 5 is a side view of the V-shaped block, FIG. 6 is a sectional view taken along the line VI-VI of FIG. FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is an explanatory view of a powder metallurgy process for obtaining a primary material, and FIGS. 9 to 13 show a press molding process for obtaining a secondary material. FIG. 9 is a longitudinal sectional view of the press-forming apparatus before the operation, FIG. 10 is a view taken along the line XX of FIG. 9, FIG. 11 is a partial perspective view of the press-punch, and FIG. 13 is a longitudinal sectional view of the device, FIG. 13 is a sectional view taken along the line XIII-XIII of FIG.
FIG. 16 shows a shape correcting step for obtaining a V-shaped block, FIG. 14 is a cross-sectional view of an outer mold, corresponding to a cross-sectional view taken along a line XIV-XIV in FIG. 15, and FIG. XV line sectional view, Fig. 16 shows 2
It is explanatory drawing which shows the relationship between a next material and a shaping hole. d: Interval, g: V-groove, 2, 3 Drive, driven V pulley, 5: Endless strip, 6: V-shaped block, 6 1 , 6
2 … 1,2nd material, 10… receiving surface, 10a… flat surface, 12…
Inclined surface, 26 ... Pressing punch (molding mold), 27 ... Die (molding mold), 41 ... Shape correcting mold, 45 ... Shaping hole, 48 ...
Inside
Claims (1)
面と、両傾斜面間に在って無端ストリップの内周面を受
ける受面とを有し、該受面を、少なくとも前記無端スト
リップ巻回方向の中央部を頂部とする凸弧面に形成した
金属製Ｖ形ブロックを製造すべく、金属粉末を用いた圧
粉体成形作業および圧粉体焼結作業を経て、両傾斜面を
有すると共に前記受面に対応する部分を平坦面に形成さ
れた１次素材を得、次いで、一方の成形型により前記１
次素材の両傾斜面を同時に押圧して前記平坦面を他方の
成形型の凹弧状成形面に倣わせることにより前記受面を
成形された２次素材を得、その後、形状矯正型の整形孔
内で、両傾斜面および受面に隣接する前記２次素材の両
端面を挟圧して形状矯正作業を行うＶ形ブロックの製造
方法において、前記挟圧に伴う前記受面の膨出変形時該
受面が、それと対向する前記整形孔内面に接触しないよ
うに、前記受面と前記整形孔内面との間に間隔を存して
前記形状矯正作業を行うことを特徴とする無端金属ベル
ト用Ｖ形ブロックの製造方法。The present invention has a pair of inclined surfaces slidingly contacting an inner surface of a V-groove of a V-pulley, and a receiving surface between the two inclined surfaces for receiving an inner peripheral surface of an endless strip. In order to manufacture a metal V-shaped block formed on a convex arc surface having the top portion at the center in the winding direction of the endless strip, through a green compacting operation using a metal powder and a green compact sintering operation, A primary material having a flat surface and a portion corresponding to the receiving surface is obtained.
By pressing both inclined surfaces of the next material at the same time to make the flat surface conform to the concave arc-shaped molding surface of the other molding die, a secondary material having the receiving surface molded is obtained, and thereafter, shaping of the shape correction mold is performed. In a method of manufacturing a V-shaped block in which a shape correcting operation is performed by squeezing both end surfaces of the secondary material adjacent to both inclined surfaces and a receiving surface in a hole, the swelling deformation of the receiving surface due to the squeezing pressure The endless metal belt for performing the shape correction work with an interval between the receiving surface and the shaping hole inner surface so that the receiving surface does not contact the shaping hole inner surface facing the receiving surface. A method for manufacturing a V-shaped block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29152488A JP2620965B2 (en) | 1988-11-18 | 1988-11-18 | Method of manufacturing V-shaped block for endless metal belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29152488A JP2620965B2 (en) | 1988-11-18 | 1988-11-18 | Method of manufacturing V-shaped block for endless metal belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02138405A JPH02138405A (en) | 1990-05-28 |
| JP2620965B2 true JP2620965B2 (en) | 1997-06-18 |
Family
ID=17770017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29152488A Expired - Lifetime JP2620965B2 (en) | 1988-11-18 | 1988-11-18 | Method of manufacturing V-shaped block for endless metal belt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2620965B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773476A (en) * | 2012-06-01 | 2012-11-14 | 常州精研科技有限公司 | Arc shaping tool |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT504080B1 (en) * | 2006-09-12 | 2008-07-15 | Miba Sinter Austria Gmbh | METHOD FOR PRODUCING OUTSIDE TIMING BELTS OR CHAIN WHEELS |
| JP2011017389A (en) * | 2009-07-09 | 2011-01-27 | Toyota Motor Corp | Power transmission belt |
-
1988
- 1988-11-18 JP JP29152488A patent/JP2620965B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773476A (en) * | 2012-06-01 | 2012-11-14 | 常州精研科技有限公司 | Arc shaping tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02138405A (en) | 1990-05-28 |
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