JP3339363B2 - Half blanking forming method and cold forging die used for the method - Google Patents
Half blanking forming method and cold forging die used for the methodInfo
- Publication number
- JP3339363B2 JP3339363B2 JP15742497A JP15742497A JP3339363B2 JP 3339363 B2 JP3339363 B2 JP 3339363B2 JP 15742497 A JP15742497 A JP 15742497A JP 15742497 A JP15742497 A JP 15742497A JP 3339363 B2 JP3339363 B2 JP 3339363B2
- Authority
- JP
- Japan
- Prior art keywords
- punch
- die
- workpiece
- cold forging
- forging die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Punching Or Piercing (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は被加工材を半抜き成
形する方法およびこれに使用する冷間鍛造型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for half blanking a workpiece and a cold forging die used for the method.
【０００２】[0002]
【従来の技術】図１４にはシートリクライニング装置に
使用するラチェット板Ｐ´を示し、このラチェット板Ｐ
´は円形板体の内周部がさらに円形に凹陥して、この凹
陥部の内周に歯形Ｐ１が形成されている。このような内
周歯Ｐ１を有するラチェット板Ｐ´を一体成形する方法
として、冷間鍛造型を使用した半抜きプレス成形が知ら
れている。これは、図１１に示すように、図略の上型
に、板押え４と、外周に成形用歯形３１を有するパンチ
３とを設け、一方、下型には上記パンチ３の外径よりも
大きな内径のダイ孔５１を有するダイ５を設けて、板押
え４とダイ５とで被加工材Ｍを保持した状態でパンチ３
を所定量進出させるもので、ダイ孔５１内に被加工材Ｍ
の中心部が剪断により切り込み進入させられるととも
に、パンチ３により押し出されて半抜き成形された被加
工材Ｍの凹陥部内周に、パンチ外周の成形用歯形３１に
よって歯形Ｐ１（図１４）が同時形成される。2. Description of the Related Art FIG. 14 shows a ratchet plate P 'used for a seat reclining device.
In ′, the inner peripheral portion of the circular plate is further concavely formed in a circular shape, and a tooth profile P1 is formed on the inner periphery of the concave portion. As a method of integrally forming the ratchet plate P ′ having such inner peripheral teeth P1, half punch press forming using a cold forging die is known. In this, as shown in FIG. 11, a plate holder 4 and a punch 3 having a molding tooth shape 31 on the outer periphery are provided on an unillustrated upper die, while the outer die of the punch 3 is provided on a lower die. A die 5 having a die hole 51 having a large inner diameter is provided, and the punch 3 is held while the workpiece M is held by the plate holder 4 and the die 5.
Is advanced by a predetermined amount.
Is formed by shearing the central portion of the workpiece M, and a tooth profile P1 (FIG. 14) is simultaneously formed on the inner periphery of the recessed portion of the workpiece M extruded by the punch 3 and formed by half punching. Is done.
【０００３】しかし、この方法では、ダイ孔５１開口縁
の切り刃５２とパンチ３の先端コーナ部を結ぶ線上で成
形時に剪断力（図１１の矢印）による亀裂Ｃを生じやす
いという問題があった。なお、図１１において、符号７
はダイ孔５１内に摺動可能に設けられたノックアウトで
あり、このノックアウト７は、成形時にダイ孔５１内に
切り込み進入する被加工材Ｍに対して殆ど抵抗無く後退
する。However, in this method, there is a problem that a crack C due to a shearing force (arrow in FIG. 11) is apt to be generated at the time of molding on a line connecting the cutting edge 52 of the opening edge of the die hole 51 and the corner of the tip of the punch 3. . Note that in FIG.
Is a knockout slidably provided in the die hole 51, and the knockout 7 retreats with almost no resistance to the workpiece M cut into the die hole 51 during molding.
【０００４】そこで、成形時の亀裂の発生を防止するた
めに、図１２に示すように、ダイ孔５１の内径をパンチ
３の外径よりも小さくして、ダイ５とパンチ３をラップ
させることにより、ダイ孔５１の切り刃５２とパンチ３
先端コーナ部を結ぶ線上の材料部分に成形時に所定の静
水圧が印加されるようにする方法が行われている。In order to prevent the occurrence of cracks during molding, as shown in FIG. 12, the inner diameter of the die hole 51 is made smaller than the outer diameter of the punch 3 so that the die 5 and the punch 3 are wrapped. The cutting blade 52 of the die hole 51 and the punch 3
There is a method in which a predetermined hydrostatic pressure is applied to a material portion on a line connecting the tip corner portions during molding.
【０００５】[0005]
【発明が解決しようとする課題】しかし、この方法によ
ると、亀裂の発生は防止されるものの、半抜き深さ（図
１２のｄ）を常に被加工材Ｍの厚みよりも浅くする必要
があるために、内周歯を成形した場合にその噛み合い代
の長さを十分確保することができないという問題があ
る。一方、半抜き深さｄを深くして内周歯の噛み合い代
を長く確保しようとすると、製品の内周部と外周部をつ
なぐ部分（図１２のＡ部）の厚みが不十分となって、強
度が低下してしまう。また、ダイ５とパンチ３のラップ
部に成形時に大きな圧縮荷重が加わるため、特に成形用
歯形３１を有するパンチ３の寿命が低下するという問題
もある。However, according to this method, although the occurrence of cracks is prevented, the half-blanking depth (d in FIG. 12) must always be smaller than the thickness of the workpiece M. For this reason, when the inner peripheral teeth are formed, there is a problem that the length of the engagement margin cannot be sufficiently secured. On the other hand, if it is attempted to increase the half-deeping depth d to secure a long allowance for engagement of the inner peripheral teeth, the thickness of the portion (A in FIG. 12) connecting the inner peripheral portion and the outer peripheral portion of the product becomes insufficient. , The strength is reduced. Further, since a large compressive load is applied to the lap portion between the die 5 and the punch 3 during molding, there is a problem that the life of the punch 3 having the molding tooth form 31 is particularly reduced.
【０００６】そこで、本発明はこのような課題を解決す
るもので、十分な半抜き深さを確保しつつ強度の高い製
品が得られるとともに、プレス装置の寿命低下もきたさ
ない半抜き成形方法およびこれに使用する冷間鍛造型を
提供することを目的とする。Accordingly, the present invention has been made to solve such a problem, and a product having a high strength can be obtained while securing a sufficient half-punching depth, and a half-punching forming method which does not cause a reduction in the life of a press device. An object is to provide a cold forging die used for this.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本第１発明の半抜き成形方法は、板押え（４）と、
板押え（４）側に設けたパンチ（３）と、板押え（４）
に対向して配設されたダイ（５）と、ダイ孔（５１）内
にその内周に接して摺動可能に設けられた逆押えパンチ
（６）とを備え、ダイ（５）とパンチ（３）がラップし
ないように、ダイ孔（５１）の内径がパンチ（３）の外
径よりも大きい冷間鍛造型を使用し、パンチ（３）を被
加工材(Ｍ)の上面中心部に進入させることにより、被加
工材(Ｍ)の上面中心部に凹陥部を形成しつつ被加工材
(Ｍ)の下面中心部をダイ孔（５１）内に進入させると同
時に、パンチ（３）と逆押えパンチ（６）とによって被
加工材（Ｍ）を挟圧し、この挟圧部に、圧縮変形を生じ
させる静水圧を印加しつつ半抜き成形するものである。
この場合、パンチ（３）外周の必要部に成形用歯形（３
１）を設けることができる。Means for Solving the Problems To achieve the above object, the half blanking forming method of the first invention comprises a plate holder (4),
Punch (3) provided on plate holder (4) side and plate holder (4)
Punch and disposed opposite dies (5), in contact with the inner circumferential die hole (51) in a reverse pressing punch slidably provided (6), die (5) and the (3) wraps
Use a cold forging die in which the inner diameter of the die hole (51) is larger than the outer diameter of the punch (3) so that the punch (3) is not covered.
By entering the center of the upper surface of the work material (M),
Work material while forming a recess at the center of the upper surface of the work material (M)
When the center of the lower surface of (M) enters the die hole (51),
Sometimes, the workpiece (M) is clamped by the punch (3) and the reverse presser punch (6), and half-punching is performed while applying a hydrostatic pressure that causes compressive deformation to the clamping portion.
In this case, a necessary portion of the outer periphery of the punch (3) is formed with a molding tooth profile (3
1) can be provided.
【０００８】本第１発明においては、パンチと逆押えパ
ンチで挟圧された被加工材部分が大きな静水圧を受けて
圧縮変形するとともに、この部分では材料自体の塑性流
動性が向上して、成形時の剪断変形部へ材料が効率的に
供給される。これにより、剪断変形部での亀裂の発生が
未然に防止される。そして、本第１発明では、ダイ孔の
内径がパンチの外径より大きい冷間鍛造型を使用できる
から、半抜き深さが被加工材の厚み以内に制限されるこ
とはない。また、半抜き深さを深くしても、製品の内周
部と外周部をつなぐ部分の厚みが薄くなることはないか
ら、十分な製品強度が得られる。さらに、冷間鍛造型の
ダイとパンチがラップしていないから、成形時にパンチ
等に過大な圧縮荷重が印加されることはなく、寿命の低
下が避けられる。成形時の半抜き深さを深くできること
により、パンチ外周に成形用歯形を設けた場合には、半
抜き時に同時成形される内周歯の噛み合い代を十分に確
保することができる。According to the first aspect of the present invention, the workpiece portion sandwiched by the punch and the reverse presser punch receives a large hydrostatic pressure and undergoes compression deformation, and at this portion, the plastic fluidity of the material itself is improved. The material is efficiently supplied to the shear deformation portion during molding. Thereby, the occurrence of cracks in the shear deformation portion is prevented. In the first invention, a cold forging die in which the inner diameter of the die hole is larger than the outer diameter of the punch can be used, so that the half-blanking depth is not limited to within the thickness of the workpiece. Further, even if the half-blanking depth is increased, the thickness of the portion connecting the inner peripheral portion and the outer peripheral portion of the product does not become thin, so that sufficient product strength can be obtained. Further, since the die of the cold forging die and the punch do not overlap, no excessive compressive load is applied to the punch or the like at the time of molding, and a reduction in life can be avoided. Since the shaping depth at the time of shaping can be increased, when the shaping tooth profile is provided on the outer periphery of the punch, the meshing allowance of the inner circumferential teeth simultaneously formed at the time of shaping can be sufficiently ensured.
【０００９】本第２発明では、半抜き成形方法に使用す
る冷間鍛造型は、ダイ孔（５１）の周縁の切り刃（５
２）を外方へ開くテーパ面に成形してある。In the second aspect of the present invention, the cold forging die used in the half blanking forming method includes a cutting blade (5) on the periphery of the die hole (51).
2) is formed into a tapered surface that opens outward.
【００１０】このように切り刃がテーパ面としてあるた
め、塑性流動性が向上した材料が剪断変形部へより効率
的に供給され、これにより、成形時の亀裂の発生がさら
に効果的に防止される。[0010] Since the cutting edge has a tapered surface, the material having improved plastic fluidity can be more efficiently supplied to the shear deformation portion, and thereby the generation of cracks during molding can be more effectively prevented. You.
【００１１】[0011]
（第１実施形態）図１には、本発明の方法を適用するプ
レス装置の冷間鍛造型の断面を示す。図において、上型
１の下面には下方へ向けて柱状のパンチ３が設けてあ
る。当該パンチ３の外周には必要範囲に成形用歯形３１
が形成されるとともに、その先端中心部は凹陥して凹所
３２となり、この凹所３２の周囲の必要箇所は凹陥する
ことなく残されて突出部３３となっている。上記パンチ
３の周囲には環状の板押え４が配設してあり、板押え４
は上型１から突出する油圧ピストン４１，４２によって
背後を支持されている。板押え４の下面にはパンチ３を
囲むように環状突起４３が形成されている。(First Embodiment) FIG. 1 shows a cross section of a cold forging die of a press apparatus to which the method of the present invention is applied. In the figure, a columnar punch 3 is provided on the lower surface of the upper die 1 downward. On the outer periphery of the punch 3, the forming tooth shape 31
Is formed, the center of the tip is recessed to form a recess 32, and a necessary portion around the recess 32 is left without being recessed to form a projection 33. An annular plate holder 4 is provided around the punch 3.
Is supported at the back by hydraulic pistons 41 and 42 projecting from the upper mold 1. An annular projection 43 is formed on the lower surface of the plate holder 4 so as to surround the punch 3.
【００１２】下型２上にはダイ５が設けられ、その中心
にはパンチ３と相似形で、その外径よりも大きな内径を
有するダイ孔５１が形成されている。被加工材Ｍはダイ
５の上面に載置されている。ダイ孔５１は上記パンチ３
と同心に位置しており、ダイ孔５１内にはその内周に接
して摺動可能に逆押えパンチ６が位置している。この逆
押えパンチ６は背後を油圧ピストン６１によって支持さ
れている。なお、ダイ孔５１開口縁の切り刃５２は一定
角度で外方へ開くテーパ面としてある。A die 5 is provided on the lower die 2, and a die hole 51 having a shape similar to the punch 3 and having an inner diameter larger than the outer diameter is formed at the center thereof. The workpiece M is placed on the upper surface of the die 5. The die hole 51 is formed by the punch 3
In the die hole 51, a reverse pressing punch 6 is slidably in contact with the inner periphery thereof. The back press punch 6 is supported by a hydraulic piston 61 at the back. The cutting edge 52 at the opening edge of the die hole 51 is a tapered surface that opens outward at a fixed angle.
【００１３】このようなプレス装置を使用して被加工材
を半抜き成形する方法について以下に説明する。上死点
から上型１を下降させると、板押え４の環状突起４３が
被加工材Ｍの上面に当接して（図６のａ点）、以後、上
型１の下降に伴って板押え４の荷重は比例的に増大する
（図６）。なお、図６のｂ点は板押え４が被加工材Ｍの
上面から離れる点である。上型１がさらに下降するとパ
ンチ３の突出部３３先端が被加工材Ｍに当接し（図
２）、パンチ３の荷重は上型１が下死点に向かうに従っ
て急増する（図７）。この時、板押え４の環状突起４３
は被加工材Ｍの上面に楔状に食い込み、加工時の剪断変
形部へ材料を供給してダレの発生を防止する。A method for half-punching a workpiece using such a press device will be described below. When the upper mold 1 is lowered from the top dead center, the annular projection 43 of the plate holder 4 comes into contact with the upper surface of the workpiece M (point a in FIG. 6). The load of No. 4 increases proportionally (FIG. 6). The point b in FIG. 6 is a point at which the plate presser 4 is separated from the upper surface of the workpiece M. When the upper die 1 further descends, the tip of the projecting portion 33 of the punch 3 comes into contact with the workpiece M (FIG. 2), and the load of the punch 3 rapidly increases as the upper die 1 moves toward the bottom dead center (FIG. 7). At this time, the annular projection 43 of the plate holder 4
Cuts into the upper surface of the workpiece M in a wedge shape, and supplies the material to the shearing deformation portion at the time of processing to prevent the occurrence of sagging.
【００１４】さらに上型１が下降すると、図３に示すよ
うに、パンチ３は被加工材Ｍの上面中心部にこれを剪断
変形させつつ進入し、この進入により形成された被加工
材Ｍの凹陥部に、成形用歯形３１によって内周歯が形成
される。同時に、被加工材Ｍの下面中心部はダイ孔５１
内に剪断変形により切り込み進入させられる。この時の
パンチ３２の荷重は既に説明したように（図７）プレス
下死点に向かうにつれて急増するが、同時に、本発明方
法では、被加工材Ｍの下面中心部に当接する逆押えパン
チ６の荷重も、図８に示すように、プレス下死点に向け
て急増させる。これにより、被加工材Ｍはパンチ３の突
出部３３と逆押えパンチ６とで特に中心部周縁が上下か
ら挟圧され（図５の白矢印）、この部分が大きな静水圧
を受けて圧縮変形するとともに、この部分の材料自体の
塑性流動性が向上して、図５の黒矢印で示すように、成
形時の剪断変形部へ材料が供給される。この材料供給
は、パンチ３の下端突出部３３に大きな押圧力が生じる
こと、およびダイ孔５１開口縁の切り刃５２を外方へ開
くテーパ面としてあることにより促進され、これによ
り、剪断変形部で亀裂を生じることが防止される。被加
工材Ｍの成形が終了すると、図４に示すように、上型１
が上昇した後、逆押えパンチ６が上昇して、図１３にそ
の外観を示す製品としてのラチェット板Ｐが離型させら
れる。When the upper mold 1 is further lowered, as shown in FIG. 3, the punch 3 enters the central portion of the upper surface of the workpiece M while shearing it, and the punch 3 Inner peripheral teeth are formed in the concave portion by the molding tooth form 31. At the same time, the center of the lower surface of the workpiece M is
The cut is made to enter by shearing deformation. At this time, the load of the punch 32 suddenly increases toward the bottom dead center of the press as described above (FIG. 7), but at the same time, according to the method of the present invention, the reverse pressing punch 6 abuts against the center of the lower surface of the workpiece M. Is also increased rapidly toward the bottom dead center of the press as shown in FIG. As a result, the workpiece M is pinched by the projecting portion 33 of the punch 3 and the back-pressing punch 6 particularly from the upper and lower edges (white arrows in FIG. 5), and this portion is subjected to a large hydrostatic pressure and is compressed and deformed. At the same time, the plastic fluidity of the material itself in this portion is improved, and the material is supplied to the shear deformation portion during molding, as indicated by the black arrow in FIG. This material supply is facilitated by the generation of a large pressing force on the lower end protruding portion 33 of the punch 3 and the use of the cutting edge 52 at the opening edge of the die hole 51 as a tapered surface that opens outward. To prevent cracking. When the forming of the workpiece M is completed, as shown in FIG.
Is raised, the reverse press punch 6 is raised, and the ratchet plate P as a product whose appearance is shown in FIG. 13 is released.
【００１５】このように、本発明の方法を適用すると、
ダイ孔５１の内径がパンチ３の外径より大きいプレス装
置を使用しても亀裂の無い良好な製品を得ることができ
るから、図４に示すように、半抜き深さｄ、すなわち本
実施形態のように内周歯Ｐ１を形成した場合にはその噛
み合い代ｄを製品Ｐ（すなわち被加工材Ｍ）の厚み以内
に制限する必要はなく、十分な長さの噛み合い代ｄを有
する製品Ｐを得ることができる。また、十分な長さの噛
み合い代ｄを確保しても、製品Ｐの内周部と外周部をつ
なぐ部分には常に縦壁Ｐ２が形成され、この部分の厚み
が確保されて十分な製品強度が得られる。さらに、プレ
ス装置のダイ５とパンチ３がラップしていないから、成
形時にパンチ３等に過大な圧力荷重が印加されることは
なく、寿命の低下が避けられる。Thus, when the method of the present invention is applied,
A good product without cracks can be obtained even by using a press device in which the inner diameter of the die hole 51 is larger than the outer diameter of the punch 3. Therefore, as shown in FIG. In the case where the inner peripheral teeth P1 are formed as described above, it is not necessary to limit the engagement margin d within the thickness of the product P (that is, the workpiece M), and the product P having the engagement margin d of a sufficient length is not required. Obtainable. Further, even if the engagement margin d having a sufficient length is secured, a vertical wall P2 is always formed at a portion connecting the inner peripheral portion and the outer peripheral portion of the product P, and the thickness of this portion is ensured to provide sufficient product strength. Is obtained. Furthermore, since the die 5 and the punch 3 of the press device do not overlap, an excessive pressure load is not applied to the punch 3 and the like at the time of molding, and a reduction in the life can be avoided.
【００１６】（第２実施形態）被加工材Ｍを挟圧して、
この部分の材料の塑性流動性を向上させる構造として
は、例えば図９に示すように、パンチ３の下端面を平面
とする一方、これに対向する逆押えパンチ６の上端面中
心部を凹所６１としてその周囲の必要箇所に突出部６２
を形成したものが採用できる。このような構造によれ
ば、突出部６２とパンチ３下端面とで被加工材Ｍの中心
部周縁を図中白矢印のように上下から挟圧して、この部
分の材料の塑性流動性を向上させ、図中黒矢印で示すよ
うに、テーパ面とした切り刃５２に沿って成形時の剪断
変形部へ材料が効率的に供給される。このように、突出
部６２を逆押えパンチ６側に設けると、材料が剪断変形
部へより流動し易くなる。この結果、半抜き深さｄを深
くしても、完成された製品の内周部と外周部をつなぐ部
分には常に縦壁Ｐ２が形成され、この部分の厚みが確保
されて十分な製品強度が得られる等、第１実施形態と同
様の効果が得られる。(Second Embodiment) The work piece M is pressed,
As a structure for improving the plastic fluidity of the material in this portion, for example, as shown in FIG. 9, the lower end face of the punch 3 is made flat, and the center of the upper end face of the reverse pressing punch 6 opposed to this is formed as a recess. Projection 62
Can be adopted. According to such a structure, the peripheral edge of the central portion of the workpiece M is pressed from above and below by the projecting portion 62 and the lower end surface of the punch 3 as indicated by the white arrow in the drawing to improve the plastic fluidity of the material in this portion. As a result, as shown by the black arrow in the drawing, the material is efficiently supplied to the shear deformation portion during molding along the cutting blade 52 having the tapered surface. As described above, when the protruding portion 62 is provided on the reverse pressing punch 6 side, the material flows more easily to the shear deformation portion. As a result, a vertical wall P2 is always formed at a portion connecting the inner peripheral portion and the outer peripheral portion of the completed product even if the half-blanking depth d is increased, and the thickness of this portion is ensured to provide sufficient product strength. Are obtained, and the same effects as in the first embodiment can be obtained.
【００１７】（第３実施形態）突出部６３を、図１０に
示すように、逆押えパンチ６の上端面外周部に円弧断面
形状で設けた構造としても良い。このような構造によっ
ても、突出部６３とパンチ３下端面とで被加工材Ｍの中
心部周縁が図中白矢印のように上下から挟圧され、この
部分の材料の塑性流動性が向上して、図中黒矢印で示す
ように、テーパ面とした切り刃５２に沿って成形時の剪
断変形部へ材料が効率的に供給される。本実施形態にお
いても、第２実施形態と同様の効果が得られる。(Third Embodiment) As shown in FIG. 10, the protrusion 63 may be provided on the outer periphery of the upper end surface of the reverse pressing punch 6 in a circular cross section. Even with such a structure, the peripheral edge of the center of the workpiece M is pressed from above and below by the projecting portion 63 and the lower end surface of the punch 3 as indicated by the white arrow in the figure, and the plastic fluidity of the material in this portion is improved. Thus, as indicated by the black arrow in the drawing, the material is efficiently supplied to the shear deformation portion during molding along the cutting edge 52 having the tapered surface. In the present embodiment, the same effects as in the second embodiment can be obtained.
【００１８】[0018]
【発明の効果】以上のように、本発明によれば、十分な
半抜き深さを確保しつつ強度の高い製品を得ることがで
きるとともに、プレス装置の寿命低下をきたすこともな
い。As described above, according to the present invention, a product having high strength can be obtained while securing a sufficient half-blanking depth, and the life of the press device does not decrease.
【図１】本発明の第１実施形態における、本発明方法を
適用するプレス装置の冷間鍛造型の断面図である。FIG. 1 is a cross-sectional view of a cold forging die of a press device to which a method of the present invention is applied according to a first embodiment of the present invention.
【図２】プレス装置作動時の冷間鍛造型の断面図であ
る。FIG. 2 is a cross-sectional view of the cold forging die when the press device is operated.
【図３】プレス装置作動時の冷間鍛造型の断面図であ
る。FIG. 3 is a cross-sectional view of the cold forging die when the press device is operated.
【図４】プレス装置作動時の冷間鍛造型の断面図であ
る。FIG. 4 is a cross-sectional view of the cold forging die when the press device is operated.
【図５】プレス装置作動時の冷間鍛造型の要部拡大断面
図である。FIG. 5 is an enlarged sectional view of a main part of the cold forging die when the press device is operated.
【図６】プレス装置作動時の板押え荷重の経時変化を示
すグラフである。FIG. 6 is a graph showing a temporal change of a plate pressing load when the press device is operated.
【図７】プレス装置作動時のパンチ荷重の経時変化を示
すグラフである。FIG. 7 is a graph showing a change over time of a punch load when the press device is operated.
【図８】プレス装置作動時の逆押えパンチ荷重の経時変
化を示すグラフである。FIG. 8 is a graph showing a change with time of a reverse press punch load when the press device is operated.
【図９】本発明の第２実施形態における、プレス装置作
動時の冷間鍛造型の要部拡大断面図である。FIG. 9 is an enlarged cross-sectional view of a main part of a cold forging die during operation of a press device according to a second embodiment of the present invention.
【図１０】本発明の第３実施形態における、プレス装置
作動時の冷間鍛造型の要部拡大断面図である。FIG. 10 is an enlarged sectional view of a main part of a cold forging die when a press device is operated in a third embodiment of the present invention.
【図１１】従来方法を適用したプレス装置の冷間鍛造型
の要部拡大断面図である。FIG. 11 is an enlarged sectional view of a main part of a cold forging die of a press device to which a conventional method is applied.
【図１２】従来方法を適用したプレス装置の冷間鍛造型
の要部拡大断面図である。FIG. 12 is an enlarged sectional view of a main part of a cold forging die of a press device to which a conventional method is applied.
【図１３】本発明の方法で成形したラチェット板の全体
斜視図である。FIG. 13 is an overall perspective view of a ratchet plate formed by the method of the present invention.
【図１４】従来の方法で成形したラチェット板の全体斜
視図である。FIG. 14 is an overall perspective view of a ratchet plate formed by a conventional method.
３…パンチ、３１…成形用歯形、３３…突出部、４…板
押え、５…ダイ、５１…ダイ孔、５２…切り刃、６…逆
押えパンチ、６２，６３…突出部、Ｍ…被加工材、Ｐ１
…内周歯。DESCRIPTION OF SYMBOLS 3 ... Punch, 31 ... Molding tooth shape, 33 ... Projection part, 4 ... Plate holder, 5 ... Die, 51 ... Die hole, 52 ... Cutting blade, 6 ... Reverse holding punch, 62, 63 ... Projection part, M ... Cover Work material, P1
… Inner teeth.
フロントページの続き (56)参考文献 特開 昭57−172276（ＪＰ，Ａ) 特開 昭50−53981（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21J 1/00 - 13/14 B21J 17/00 - 19/04 B21K 1/00 - 31/00 B21D 28/10 B21D 28/14 B21D 28/34 Continuation of the front page (56) References JP-A-57-172276 (JP, A) JP-A-50-53,981 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B21J 1 / 00-13/14 B21J 17/00-19/04 B21K 1/00-31/00 B21D 28/10 B21D 28/14 B21D 28/34
Claims (2)
設けたパンチ（３）と、前記板押え（４）に対向して配
設されたダイ（５）と、ダイ孔（５１）内にその内周に
接して摺動可能に設けられた逆押えパンチ（６）とを備
え、前記ダイ（５）と前記パンチ（３）がラップしない
ように、前記ダイ孔（５１）の内径が前記パンチ（３）
の外径よりも大きい冷間鍛造型を使用し、前記パンチ
（３）を前記被加工材(Ｍ)の上面中心部に進入させるこ
とにより、前記被加工材(Ｍ)の上面中心部に凹陥部を形
成しつつ前記被加工材(Ｍ)の下面中心部をダイ孔（５
１）内に進入させると同時に、前記パンチ（３）と前記
逆押えパンチ（６）とによって前記被加工材（Ｍ）を挟
圧し、この挟圧部に、圧縮変形を生じさせる静水圧を印
加しつつ半抜き成形することを特徴とする半抜き成形方
法。1. A plate retainer (4), a punch (3) provided on the plate retainer (4) side, a die (5) arranged opposite to the plate retainer (4), and a die hole. (51) in the inner circumference
Contact with a slidably reverse pressing punch is provided (6) and with said punch (3) and the die (5) does not wrap
As described above, the inner diameter of the die hole (51) is larger than that of the punch (3).
Using a cold forging die larger than the outer diameter of the punch
(3) into the center of the upper surface of the workpiece (M).
As a result, a recess is formed at the center of the upper surface of the workpiece (M).
The center of the lower surface of the workpiece (M) is formed in a die hole (5
1) At the same time, the workpiece (M) is pressed by the punch (3) and the reverse pressing punch (6), and a hydrostatic pressure that causes compressive deformation is applied to the pressing portion. A half blanking forming method characterized by performing half blanking while performing.
する冷間鍛造型において、前記ダイ孔（５１）の周縁の
切り刃（５２）を外方へ開くテーパ面に成形したことを
特徴とする冷間鍛造型。2. A cold forging die used in the half blanking forming method according to claim 1, wherein a cutting edge (52) on a peripheral edge of the die hole (51) is formed into a tapered surface that opens outward. Features a cold forging die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15742497A JP3339363B2 (en) | 1996-11-25 | 1997-05-30 | Half blanking forming method and cold forging die used for the method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-330300 | 1996-11-25 | ||
| JP33030096 | 1996-11-25 | ||
| JP15742497A JP3339363B2 (en) | 1996-11-25 | 1997-05-30 | Half blanking forming method and cold forging die used for the method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10202329A JPH10202329A (en) | 1998-08-04 |
| JP3339363B2 true JP3339363B2 (en) | 2002-10-28 |
Family
ID=26484889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15742497A Expired - Fee Related JP3339363B2 (en) | 1996-11-25 | 1997-05-30 | Half blanking forming method and cold forging die used for the method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3339363B2 (en) |
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| JP4735380B2 (en) * | 2005-07-01 | 2011-07-27 | トヨタ紡織株式会社 | Workpiece manufacturing method |
| JP4758297B2 (en) * | 2006-07-28 | 2011-08-24 | シロキ工業株式会社 | Press apparatus and press method |
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| CN116140520B (en) * | 2023-02-02 | 2023-07-18 | 山东煌腾优钢锻造股份有限公司 | Forging machine for quenching forging |
-
1997
- 1997-05-30 JP JP15742497A patent/JP3339363B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11224909B2 (en) | 2015-07-07 | 2022-01-18 | Nippon Steel Corporation | Protrusion molding device, protrusion molding method, and molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10202329A (en) | 1998-08-04 |
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