JPH1133666A - Die for free extrusion - Google Patents
Die for free extrusionInfo
- Publication number
- JPH1133666A JPH1133666A JP20216097A JP20216097A JPH1133666A JP H1133666 A JPH1133666 A JP H1133666A JP 20216097 A JP20216097 A JP 20216097A JP 20216097 A JP20216097 A JP 20216097A JP H1133666 A JPH1133666 A JP H1133666A
- Authority
- JP
- Japan
- Prior art keywords
- insertion hole
- shaft member
- die
- stock
- molding
- 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.)
- Granted
Links
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、棒状の素材を長
手方向に移動して所定の断面形状に塑性加工する場合に
用いられる自由押出し成形用ダイスに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for free-extrusion molding which is used when a rod-shaped material is moved in a longitudinal direction and plastically processed into a predetermined sectional shape.
【０００２】[0002]
【従来の技術】軸部材（素材）を長手方向に所定の断面
形状に塑性加工する方法として、押出し加工がある。こ
の押出し加工に用いられるダイスには素材挿入孔が設け
られている。そして、軸部材を軸線方向に移動して素材
挿入孔に挿入すると、軸部材が素材挿入孔の成形面に対
応して所定の断面形状に塑性加工される。2. Description of the Related Art Extrusion is known as a method of plastically processing a shaft member (raw material) into a predetermined cross-sectional shape in the longitudinal direction. The die used for this extrusion is provided with a material insertion hole. Then, when the shaft member is moved in the axial direction and inserted into the material insertion hole, the shaft member is plastically worked into a predetermined sectional shape corresponding to the molding surface of the material insertion hole.
【０００３】上記押出し加工を行う場合に、素材挿入孔
の軸線と軸部材の軸線とが傾斜すると、軸部材の加工精
度が低下する可能性がある。そこで、素材挿入孔の成形
面と、素材挿入孔の入口との間に、素材挿入孔の軸線と
ほぼ平行な案内面を設けたダイスが採用されている。こ
のダイスを用いた場合は、まず、軸部材の外周面が案内
面に当接して方向性が付与され、素材と素材挿入孔との
真直度が維持される。その後に、成形面によって軸部材
が塑性加工されるため、加工精度が維持される。If the axis of the material insertion hole and the axis of the shaft member are inclined during the extrusion process, there is a possibility that the processing accuracy of the shaft member is reduced. Therefore, a die having a guide surface substantially parallel to the axis of the material insertion hole is provided between the molding surface of the material insertion hole and the entrance of the material insertion hole. When this die is used, first, the outer peripheral surface of the shaft member comes into contact with the guide surface to give directionality, and the straightness between the material and the material insertion hole is maintained. Thereafter, the shaft member is plastically processed by the forming surface, so that the processing accuracy is maintained.
【０００４】[0004]
【発明が解決しようとする課題】ところで、幅方向の断
面形状が、長手方向に変化する軸部材を成形する場合が
ある。この場合は、軸部材を素材挿入孔に挿入して軸部
材を塑性加工した後、軸部材を逆方向に移動して素材挿
入孔から抜き取る。By the way, there is a case where a shaft member whose sectional shape in the width direction changes in the longitudinal direction is formed. In this case, after the shaft member is inserted into the material insertion hole and the shaft member is subjected to plastic working, the shaft member is moved in the opposite direction and removed from the material insertion hole.
【０００５】一方、押出し加工においては、軸部材の加
工前の断面形状と、加工後の断面形状とを比較した場
合、軸部材の一部を半径方向に膨張して所期の断面形状
になるように、ダイスの素材挿入孔の断面形状が設定さ
れる場合がある。その理由は、軸部材とダイスとの接触
抵抗、つまり、成形荷重を可及的に抑制し、軸部材の座
屈変形を防止するためである。On the other hand, in the extrusion process, when the cross-sectional shape of the shaft member before processing and the cross-sectional shape after processing are compared, a part of the shaft member expands in the radial direction to obtain an intended cross-sectional shape. As described above, the cross-sectional shape of the material insertion hole of the die may be set. The reason is that the contact resistance between the shaft member and the die, that is, the forming load is suppressed as much as possible, and the buckling deformation of the shaft member is prevented.
【０００６】しかしながら、軸部材を膨張させるように
構成されたダイスを用いて、軸部材の押出しおよび抜き
取りを行う場合は、素材挿入孔に対する軸部材の真直度
を維持できず、軸部材の加工精度が低下する可能性があ
った。However, when the shaft member is extruded and extracted using a die configured to expand the shaft member, the straightness of the shaft member with respect to the material insertion hole cannot be maintained, and the processing accuracy of the shaft member is not maintained. Could be reduced.
【０００７】この発明は上記事情を背景としてなされた
もので、素材を素材挿入孔に挿入して半径方向に膨張さ
せ、その後に素材を素材挿入孔から抜き取る作業が行わ
れるような場合に、素材挿入孔に対する素材の真直度を
可及的に向上させることの可能な自由押出し成形用ダイ
スを提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. In a case where a material is inserted into a material insertion hole to expand in a radial direction and then the material is removed from the material insertion hole, the material is removed. It is an object of the present invention to provide a free extrusion die capable of improving the straightness of a material with respect to an insertion hole as much as possible.
【０００８】[0008]
【課題を解決するための手段およびその作用】上記目的
を達成するためこの発明は、素材が所定方向に挿入され
る素材挿入孔と、前記素材挿入孔の内面の円周方向の一
部に形成され、かつ、前記素材の半径方向の膨張領域に
当接する成形面とを備え、前記素材挿入孔に挿入される
前記素材を前記成形面により塑性加工した後、前記素材
が挿入時とは逆方向に移動して前記素材挿入孔から抜き
取られる構成の自由押出し成形用ダイスにおいて、前記
素材挿入孔の内面の円周方向における前記成形面以外の
領域よりも前記素材挿入孔の入口側に、前記素材の外周
面に当接することにより、前記素材の軸線と、前記素材
挿入孔の軸線との傾斜を抑制する案内面が形成されてい
ることを特徴とする。In order to achieve the above object, the present invention provides a material insertion hole into which a material is inserted in a predetermined direction, and a hole formed in a part of the inner surface of the material insertion hole in a circumferential direction. And a molding surface that abuts a radial expansion region of the material, and after the material inserted into the material insertion hole is plastically processed by the molding surface, the material is inserted in a direction opposite to that at the time of insertion. In the free extrusion molding die having a configuration in which the material is removed from the material insertion hole, the material insertion hole is closer to the entrance side of the material insertion hole than a region other than the molding surface in the circumferential direction of the inner surface of the material insertion hole. A guide surface is formed by contacting an outer peripheral surface of the material to suppress an inclination between an axis of the material and an axis of the material insertion hole.
【０００９】この発明によれば、素材を素材挿入孔に挿
入する工程では、案内面が素材の外周面に当接すること
で、素材の挿入方向が規制もしくは矯正される。このた
め、素材の軸線と、素材挿入孔の軸線との傾斜が抑制さ
れ、素材と素材挿入孔との真直度が維持される。したが
って、素材の成形精度が高められて歪みなどが抑制さ
れ、製品品質が向上する。According to the present invention, in the step of inserting the material into the material insertion hole, the guide surface comes into contact with the outer peripheral surface of the material, whereby the direction of material insertion is regulated or corrected. Therefore, the inclination between the axis of the material and the axis of the material insertion hole is suppressed, and the straightness between the material and the material insertion hole is maintained. Therefore, the molding accuracy of the material is increased, distortion and the like are suppressed, and the product quality is improved.
【００１０】また、案内面と素材の膨張領域とが、円周
方向の異なる位置に配置されるように、ダイスの形状が
構成されている。このため、素材の塑性加工後に素材を
ダイスから取り出す場合に、素材の膨張領域が、案内面
に阻害されずに軸線方向に移動し、素材をダイスから確
実に取り出すことができる。[0010] The shape of the die is configured so that the guide surface and the expanded region of the material are arranged at different positions in the circumferential direction. Therefore, when the material is taken out of the die after plastic working of the material, the expansion region of the material moves in the axial direction without being hindered by the guide surface, and the material can be taken out of the die without fail.
【００１１】[0011]
【発明の実施の形態】つぎに、この発明の一実施例を添
付図面に基づいて説明する。図２は、この発明を適用し
た自由押出し成形装置１の概略構成を示す正面図であ
る。自由押出し成形装置１は、押圧ラム２と、金型３
と、突き出しラム４とを備えている。前記押圧ラム２
は、軸部材（素材）５を金型３側に押圧するための機構
である。この押圧ラム２は、油圧シリンダーなどの駆動
機構（図示せず）により、軸線Ａ１方向に往復移動す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 2 is a front view showing a schematic configuration of the free extrusion molding apparatus 1 to which the present invention is applied. The free extrusion apparatus 1 includes a pressing ram 2 and a mold 3
And a protruding ram 4. Press ram 2
Is a mechanism for pressing the shaft member (material) 5 toward the mold 3. The pressing ram 2 is reciprocated in the direction of the axis A1 by a driving mechanism (not shown) such as a hydraulic cylinder.
【００１２】前記金型３は軸部材５を塑性加工（言い換
えれば絞り加工または冷間鍛造）するための機構であ
り、金型３は、押圧ラム２と突き出しラム４との間に配
置されている。この金型３は、コンテナ６と、第１ダイ
ス７および第２ダイス８とを備えている。コンテナ６に
は前記軸線Ａ１を中心とする取付穴９が貫通して形成さ
れ、取付穴９に、第１ダイス７および第２ダイス８が固
定されている。具体的には、第１ダイス７が押圧ラム２
側に配置され、第２ダイス８が突き出しラム４側に配置
されている。The die 3 is a mechanism for plastically processing (in other words, drawing or cold forging) the shaft member 5. The die 3 is disposed between the pressing ram 2 and the protruding ram 4. I have. The mold 3 includes a container 6, a first die 7 and a second die 8. A mounting hole 9 centering on the axis A1 is formed through the container 6, and a first die 7 and a second die 8 are fixed to the mounting hole 9. Specifically, the first die 7 presses the pressing ram 2
The second die 8 is disposed on the protruding ram 4 side.
【００１３】図３は、第１ダイス７の平面図、図４は、
図３のIV−IV線における第１ダイス７および第２ダイス
８の正面断面図、図５は、図３のＶ−Ｖ線における第１
ダイス７および第２ダイス８の右側面断面図である。FIG. 3 is a plan view of the first die 7, and FIG.
FIG. 5 is a front sectional view of the first die 7 and the second die 8 taken along line IV-IV in FIG. 3. FIG.
FIG. 4 is a right side sectional view of a die 7 and a second die 8.
【００１４】第１ダイス７には、軸線Ａ１を中心とする
素材挿入孔１０が貫通形成されている。そして、素材挿
入孔１０の入口、つまり、押圧ラム２側の内面には面取
部１１が形成されている。この面取部１１の側面断面形
状はほぼ円形に構成されている。また、この面取部１１
には、２つの案内面１２と、２つの円弧面１３とが接続
されている。各案内面１２は、素材挿入孔１０の内面に
円周方向の対向する位置に形成されている。The first die 7 is formed with a material insertion hole 10 centered on the axis A1. A chamfer 11 is formed at the entrance of the material insertion hole 10, that is, at the inner surface on the side of the pressing ram 2. The side cross-sectional shape of the chamfered portion 11 is substantially circular. Also, the chamfered portion 11
, Two guide surfaces 12 and two arc surfaces 13 are connected. Each guide surface 12 is formed at a position facing the inner surface of the material insertion hole 10 in the circumferential direction.
【００１５】各案内面１２は、軸線Ａ１を中心として相
互に線対称に構成されている。各案内面１２の側面形状
は、軸線Ａ１上に位置する共通の点Ｂ１を曲率中心とす
る円弧状に構成されている。The guide surfaces 12 are symmetrical with each other about the axis A1. The side surface shape of each guide surface 12 is configured in an arc shape having a common point B1 located on the axis A1 as a center of curvature.
【００１６】図１は、素材挿入孔１０と軸部材５との対
応関係を示す平面断面図である。図１において、軸線Ａ
１にほぼ直交する平面（つまり、素材挿入孔１０の幅方
向の断面）内には、軸線Ａ１にほぼ直交する線分Ｃ１が
設定されている。また、軸線Ａ１および線分Ｃ１にほぼ
直交する線分Ｅ１が設定されている。各案内面１２は、
軸線Ａ１にほぼ直交する線分Ｃ１を中心とする円周方向
の両側に亘って形成されている。さらに、各案内面１２
の内径は、軸線Ａ１方向にほぼ同一に設定されている。FIG. 1 is a plan sectional view showing the correspondence between the material insertion hole 10 and the shaft member 5. In FIG. 1, the axis A
1, a line segment C1 that is substantially orthogonal to the axis A1 is set in a plane that is substantially orthogonal to 1 (that is, a cross section in the width direction of the material insertion hole 10). In addition, a line segment E1 substantially orthogonal to the axis A1 and the line segment C1 is set. Each guide surface 12
It is formed on both sides in the circumferential direction around a line segment C1 substantially orthogonal to the axis A1. Furthermore, each guide surface 12
Are set substantially the same in the direction of the axis A1.
【００１７】そして、各案内面１２の第２ダイス８側に
は、第１成形面１４がそれぞれ接続されている。各第１
成形面１４はほぼ平坦に構成され、かつ、第１成形面１
４の平面形状はほぼ弾頭形状に構成されている。また、
各第１成形面１４同士は、軸線Ａ１に対して所定角度で
傾斜している。具体的には、各第１成形面１４同士の間
隔が、各案内面１２側から第２ダイス８側に向けて狭め
られる方向に傾斜している。A first forming surface 14 is connected to each guide surface 12 on the side of the second die 8. Each first
The molding surface 14 is configured to be substantially flat, and the first molding surface 1
4 has a substantially warhead shape. Also,
The first molding surfaces 14 are inclined at a predetermined angle with respect to the axis A1. Specifically, the interval between the first molding surfaces 14 is inclined in a direction to be narrowed from each guide surface 12 side toward the second die 8 side.
【００１８】そして、各第１成形面１４における第２ダ
イス８側の端部には、第２成形面１５がそれぞれ接続さ
れている。各第２成形面１５はほぼ平坦に構成され、各
第２成形面１５が軸線Ａ１を中心として線対称に配置さ
れている。なお、各案内面１２の軸線Ａ１方向の長さは
Ｄ１に設定されている。A second molding surface 15 is connected to an end of each first molding surface 14 on the second die 8 side. Each of the second molding surfaces 15 is configured to be substantially flat, and each of the second molding surfaces 15 is arranged symmetrically with respect to the axis A1. The length of each guide surface 12 in the direction of the axis A1 is set to D1.
【００１９】一方、前記円弧面１３は軸線Ａ１を中心と
して相互に線対称に構成されている。つまり、各円弧面
１３は側面断面形状がほぼ円弧状に構成され、各円弧面
１３は軸線Ａ１方向の長さＤ１を備えている。また、各
円弧面１３の曲率中心は軸線Ａ１からオフセットした位
置に設定されている。具体的には、前記線分Ｃ１および
軸線Ａ１に対してほぼ直交する線分Ｅ１上において、点
Ｂ１から両側に所定距離オフセットされた２つの点Ｆ１
が曲率中心になっている。さらに、各円弧面１３の半径
は、各案内面１２の半径よりも小さく設定されている。
つまり、案内面１２同士の線分Ｃ１方向の長さＧ１より
も、円弧面１３同士の線分Ｅ１方向の長さＨ１の方が長
く設定されている。On the other hand, the circular arc surfaces 13 are mutually symmetrical about the axis A1. That is, each arc surface 13 has a substantially arc-shaped side cross-sectional shape, and each arc surface 13 has a length D1 in the direction of the axis A1. The center of curvature of each arc surface 13 is set at a position offset from the axis A1. Specifically, on a line segment E1 that is substantially perpendicular to the line segment C1 and the axis line A1, two points F1 offset from the point B1 by a predetermined distance on both sides.
Is the center of curvature. Further, the radius of each arc surface 13 is set smaller than the radius of each guide surface 12.
That is, the length H1 of the arc surfaces 13 in the direction of the line E1 is set to be longer than the length G1 of the guide surfaces 12 in the direction of the line C1.
【００２０】さらにまた、各円弧面１３の円周方向の両
端は、各案内面１２および第２成形面１５に接続されて
いる。そして、各第１成形面１５と、各円弧面１３の軸
線Ａ１方向の一部とにより、環状の成形ランド１６が構
成されている。この成形ランド１６の側面断面形状は、
いわゆるトラック形状、言い換えれば小判形状に構成さ
れている。このようにして、素材挿入孔１０の内面の円
周方向における円弧面１３以外の領域から素材挿入孔１
０の入口側に至る領域の間に、各案内面１２が配置され
ている。つまり、第２成形面１５の軸線Ａ１方向の延長
線上に各案内面１２が配置されている。Furthermore, both ends in the circumferential direction of each arc surface 13 are connected to each guide surface 12 and the second forming surface 15. The first forming surface 15 and a part of each arc surface 13 in the direction of the axis A1 form an annular forming land 16. The side cross-sectional shape of the molding land 16 is as follows.
It has a so-called track shape, in other words, an oval shape. In this manner, the material insertion hole 1 is removed from a region other than the circular arc surface 13 in the circumferential direction of the inner surface of the material insertion hole 10.
Each guide surface 12 is arranged between the regions reaching the entrance side of the zero. That is, each guide surface 12 is disposed on an extension of the second molding surface 15 in the direction of the axis A1.
【００２１】なお、成形ランド１６の第２ダイス８側に
は、逃げ面１７が接続されている。この逃げ面１７は、
塑性加工された軸部材５がスプリングバックにより変形
した場合に、軸部材５と素材挿入孔１０の内面との摩擦
抵抗を軽減するために形成されている。この逃げ面１７
は、各円弧面１３に接続された２つの円弧面１８と、第
２成形面１５に接続された２つの平坦面１９とを備えて
いる。この各円弧面１８の曲率中心は、各円弧面１３の
曲率中心よりも外側に設定されている。また、各平坦面
１９同士の間隔は、各平坦面１６同士の間隔よりも長く
設定されている。つまり、逃げ面１７の側面断面形状
は、成形ランド１６にほぼ近似するトラック形状に構成
されている。また、逃げ面１７の側面断面積の方が、成
形ランド１６の側面断面積よりも広く設定されている。A flank 17 is connected to the molding die 16 on the second die 8 side. This flank 17
It is formed in order to reduce the frictional resistance between the shaft member 5 and the inner surface of the material insertion hole 10 when the plastically processed shaft member 5 is deformed by springback. This flank 17
Has two circular surfaces 18 connected to each circular surface 13 and two flat surfaces 19 connected to the second forming surface 15. The center of curvature of each arc surface 18 is set outside the center of curvature of each arc surface 13. The interval between the flat surfaces 19 is set longer than the interval between the flat surfaces 16. That is, the side cross-sectional shape of the flank 17 is formed in a track shape that is substantially similar to the molding land 16. Further, the side surface cross-sectional area of the flank 17 is set wider than the side surface cross-sectional area of the molding land 16.
【００２２】前記第２ダイス８には、ほぼトラック形状
の素材挿入孔２０が形成されている。また、前記突き出
しラム４は、金型３により塑性加工された軸部材５を、
金型３の外部に突き出すための機構である。突き出しラ
ム４は油圧シリンダーなどの駆動機構（図示せず）によ
り、軸線Ａ１方向に往復移動される。前記軸部材５は、
冷間鍛造鋼などの金属材料であり、軸部材５の幅方向の
断面形状はほぼ円形に設定されている。この軸部材５の
半径は、各案内面１２の半径よりも若干小さく設定され
ている。The second die 8 has a substantially track-shaped material insertion hole 20 formed therein. Further, the protruding ram 4 is used to form the shaft member 5 plastically processed by the mold 3.
This is a mechanism for projecting outside the mold 3. The protruding ram 4 is reciprocated in the direction of the axis A1 by a driving mechanism (not shown) such as a hydraulic cylinder. The shaft member 5 includes:
It is a metal material such as cold forged steel, and the cross-sectional shape in the width direction of the shaft member 5 is set to be substantially circular. The radius of the shaft member 5 is set slightly smaller than the radius of each guide surface 12.
【００２３】つぎに、自由押出し成形装置１により軸部
材５を成形する場合の動作を説明する。軸部材５を用い
て製造される部品としては、ステアリングシャフトなど
の自動車部品が例示される。まず、図２のように軸線Ａ
１を中心として軸部材５を配置し、かつ、図６のよう
に、突き出しラム４を素材挿入孔２０の中途部位まで挿
入する。つぎに、押圧ラム２を金型３側に前進させ、押
圧ラム２の押圧力により軸部材５を素材挿入孔１０の内
部に挿入する。すると、図１に実線で示すように、各案
内面１２が軸部材５の円周方向の２箇所に当接し、軸部
材５の挿入方向性が付与される。Next, the operation when the shaft member 5 is molded by the free extrusion molding apparatus 1 will be described. Examples of the parts manufactured using the shaft member 5 include an automobile part such as a steering shaft. First, as shown in FIG.
The shaft member 5 is arranged around the center 1 and the protruding ram 4 is inserted into the material insertion hole 20 as shown in FIG. Next, the pressing ram 2 is advanced to the mold 3 side, and the shaft member 5 is inserted into the material insertion hole 10 by the pressing force of the pressing ram 2. Then, as shown by a solid line in FIG. 1, each guide surface 12 abuts on two circumferential positions of the shaft member 5, and the insertion direction of the shaft member 5 is given.
【００２４】さらに押圧ラム２が金型３側に前進し、軸
部材５の先端のエッジ部が第１成形面１４に当接する。
すると、軸部材５に対して、線分Ｃ１方向の圧縮荷重が
与えられ、軸部材５が線分Ｃ１方向に圧縮されて軸部材
５が流動する。一方、上記圧縮荷重により、軸部材５の
流動により線分Ｅ１方向に膨張し、円弧面１３に当接す
る。したがって、軸部材５が成形ランド１６を通過する
時点で、図１に二点鎖線で示す形状に成形される。Further, the pressing ram 2 moves forward to the mold 3, and the edge of the tip of the shaft member 5 comes into contact with the first molding surface 14.
Then, a compressive load in the direction of the line segment C1 is applied to the shaft member 5, and the shaft member 5 is compressed in the direction of the line segment C1 and the shaft member 5 flows. On the other hand, the shaft member 5 expands in the direction of the line segment E1 due to the flow of the shaft member 5 due to the compressive load, and comes into contact with the arc surface 13. Therefore, when the shaft member 5 passes through the forming land 16, the shaft member 5 is formed into a shape indicated by a two-dot chain line in FIG.
【００２５】つまり、軸部材５の長手方向には、相互に
平行な平坦面２１が形成される。また、軸部材５の長手
方向には、線分Ｅ１方向の両側に円弧面（膨張領域）２
２が形成される。このように、軸部材５は、成形ランド
１６により、幅方向の断面形状がほぼトラック形状、言
い換えれば小判形状に塑性加工される。That is, flat surfaces 21 parallel to each other are formed in the longitudinal direction of the shaft member 5. In the longitudinal direction of the shaft member 5, arc surfaces (expansion regions) 2 are formed on both sides in the direction of the line segment E 1.
2 are formed. In this manner, the shaft member 5 is plastically processed by the molding land 16 into a cross-sectional shape in the width direction that is substantially a track shape, in other words, an oval shape.
【００２６】このように、軸部材５の一部を半径方向に
膨張させて軸部材５が塑性加工されるため、軸部材５と
第１ダイス７との接触抵抗、つまり、成形荷重が可及的
に抑制されて軸部材５の座屈変形が防止される。As described above, since the shaft member 5 is plastically worked by expanding a part of the shaft member 5 in the radial direction, the contact resistance between the shaft member 5 and the first die 7, that is, the forming load can be increased. Buckling of the shaft member 5 is prevented.
【００２７】そして、図７に示すように、軸部材５の長
さ方向の所定位置まで塑性加工が行われた時点で押圧ラ
ム２が停止する。ついで、押圧ラム２が金型３から離れ
る方向に後退するとともに、突き出しラム４が図７の左
方向に移動して軸部材５が金型３の外部に突き出され
る。さらに、突き出しラム４が図７の右方向に移動し、
かつ、突き出しラム４が第２ダイス８の外部に停止して
自由押出し成形の１工程が終了する。Then, as shown in FIG. 7, when the plastic working has been performed to a predetermined position in the longitudinal direction of the shaft member 5, the pressing ram 2 stops. Then, the pressing ram 2 retreats in the direction away from the mold 3, and the ejecting ram 4 moves to the left in FIG. 7 to push the shaft member 5 out of the mold 3. Further, the protruding ram 4 moves rightward in FIG.
At the same time, the protruding ram 4 stops outside the second die 8, and one step of free extrusion is completed.
【００２８】上記実施例によれば、軸部材５を素材挿入
孔１０に挿入する工程では、各案内面１２が軸部材５の
外周面の２箇所に当接する。このため軸部材５の移動方
向がほぼ直線状に案内もしくは矯正される。具体的に
は、素材挿入孔１０の軸線と、軸部材５の軸線との傾斜
が抑制され、素材挿入孔１０と軸部材５との真直度が維
持される。したがって、軸部材５の成形精度が高められ
て歪みなどが抑制され、製品品質が向上する。According to the above embodiment, in the step of inserting the shaft member 5 into the material insertion hole 10, each guide surface 12 abuts on two positions on the outer peripheral surface of the shaft member 5. For this reason, the moving direction of the shaft member 5 is guided or corrected in a substantially straight line. Specifically, the inclination between the axis of the material insertion hole 10 and the axis of the shaft member 5 is suppressed, and the straightness between the material insertion hole 10 and the shaft member 5 is maintained. Therefore, the molding accuracy of the shaft member 5 is increased, distortion and the like are suppressed, and the product quality is improved.
【００２９】また、この実施例では、各案内面１２と、
軸部材５の円弧面２２とが、円周方向の異なる位置に配
置されるように、第１ダイス７の形状が構成されてい
る。このため、軸部材５の塑性加工後に軸部材５を金型
３から取り出す場合に、軸部材５の各円弧面２２が、案
内面１２に当接することなく、各円弧面１３に沿って軸
線Ａ１方向に移動し、軸部材５を第１ダイス７から確実
に抜き出すことができる。In this embodiment, each guide surface 12
The shape of the first die 7 is configured so that the arc surface 22 of the shaft member 5 is arranged at a different position in the circumferential direction. Therefore, when the shaft member 5 is taken out of the mold 3 after the plastic working of the shaft member 5, each arc surface 22 of the shaft member 5 does not come into contact with the guide surface 12, and the axis A <b> 1 extends along each arc surface 13. , And the shaft member 5 can be reliably pulled out of the first die 7.
【００３０】さらに、軸部材５の成形精度が高められて
いるため、製品の成形精度をゲージなどで全数検査する
必要がない上、製品の歪みを除去する工程も不要にな
る。したがって、製品の製造工数および製造コストを抑
制することが可能になる。Further, since the molding accuracy of the shaft member 5 is increased, it is not necessary to inspect the molding accuracy of the product by using a gauge or the like, and the process of removing the distortion of the product becomes unnecessary. Therefore, it is possible to reduce the number of manufacturing steps and manufacturing cost of the product.
【００３１】なお、この発明は、加工前の素材の断面形
状が円形以外のものにも適用可能である。また、この発
明は、加工後の後の素材の断面形状がトラック形状以外
のものにも適用可能である。すなわち、素材の一部が半
径方向に膨張する領域を備え、かつ、素材の塑性加工後
に素材が逆方向に移動してダイスから抜き取られる構成
の自由押出し成形の全般に適用される。さらにこの発明
は、素材挿入孔の内面に、円周方向に３箇所以上の案内
面を配置して、この案内面により、素材の挿入方向を案
内することも可能である。The present invention can also be applied to a material before processing that has a cross-sectional shape other than a circle. The present invention is also applicable to materials having a cross-sectional shape other than a track shape after processing. That is, the present invention is applied to general free extrusion in which a material is provided with a region where a part of the material expands in the radial direction, and after the material is plastically worked, the material moves in the opposite direction and is removed from the die. Further, according to the present invention, it is possible to arrange three or more guide surfaces in the circumferential direction on the inner surface of the material insertion hole, and to guide the material insertion direction by these guide surfaces.
【００３２】ここで、上記の具体例に基づいて開示した
この発明に特徴的な構成を列挙すれば、以下の通りであ
る。すなわち、素材が所定方向に挿入される素材挿入孔
と、前記素材挿入孔の内面の円周方向の一部に形成さ
れ、かつ、前記素材の半径方向の膨張領域に当接する成
形面とを備え、前記素材挿入孔に挿入される前記素材を
前記成形面により塑性加工した後、前記素材が挿入時と
は逆方向に移動して前記素材挿入孔から抜き取られる構
成の自由押出し成形用ダイスにおいて、前記素材挿入孔
の内面の円周方向における前記成形面以外の領域よりも
前記素材挿入孔の入口側に、前記素材の外周面に当接す
ることにより、前記素材の軸線と、前記素材挿入孔の軸
線との傾斜を抑制する円弧形状の案内面が形成されてい
る。Here, the characteristic features of the present invention disclosed based on the above specific examples are enumerated as follows. That is, a material insertion hole into which a material is inserted in a predetermined direction, and a molding surface formed on a part of the inner surface of the material insertion hole in a circumferential direction, and abutting on a radially expanded region of the material. After plastic working of the material to be inserted into the material insertion hole by the molding surface, in a free extrusion molding die having a configuration in which the material moves in the opposite direction to the time of insertion and is removed from the material insertion hole, By contacting the outer peripheral surface of the material on the inlet side of the material insertion hole from a region other than the molding surface in the circumferential direction of the inner surface of the material insertion hole, the axis of the material, An arcuate guide surface for suppressing inclination with respect to the axis is formed.
【００３３】また、この案内面の曲率中心が、素材挿入
孔の軸線上に設定されている。上記第１成形面および第
２成形面により構成される素材挿入孔の幅方向の断面形
状として、ほぼトラック形状を採用することが可能であ
る。The center of curvature of the guide surface is set on the axis of the material insertion hole. As the cross-sectional shape in the width direction of the material insertion hole formed by the first molding surface and the second molding surface, a substantially track shape can be adopted.
【００３４】また、上記複数の第１成形面を相互に対向
して配置し、かつ、複数の第２成形面を相互に対向して
配置することが可能である。さらに、複数の第１成形面
を円周方向に等間隔で配置し、かつ、複数の第２成形面
を円周方向に等間隔で配置することが可能である。Further, it is possible to arrange the plurality of first molding surfaces so as to face each other and to arrange the plurality of second molding surfaces so as to face each other. Furthermore, it is possible to arrange a plurality of first molding surfaces at equal intervals in the circumferential direction, and to arrange a plurality of second molding surfaces at equal intervals in the circumferential direction.
【００３５】[0035]
【発明の効果】以上説明したように、この発明によれ
ば、素材を素材挿入孔に挿入する工程では、案内面が素
材の外周面に当接することで、素材の挿入方向が規制も
しくは矯正される。このため、素材の軸線と、素材挿入
孔の軸線との傾斜が抑制され、素材と素材挿入孔との真
直度が維持される。したがって、素材の成形精度が高め
られて歪みなどが抑制され、製品品質が向上する。As described above, according to the present invention, in the step of inserting a material into the material insertion hole, the guide surface comes into contact with the outer peripheral surface of the material, whereby the direction of material insertion is regulated or corrected. You. Therefore, the inclination between the axis of the material and the axis of the material insertion hole is suppressed, and the straightness between the material and the material insertion hole is maintained. Therefore, the molding accuracy of the material is increased, distortion and the like are suppressed, and the product quality is improved.
【００３６】また、案内面と素材の膨張領域とが、円周
方向の異なる位置に配置されるように、ダイスの形状が
構成されている。このため、素材の塑性加工後に素材を
ダイスから取り出す場合に、素材の膨張領域が、案内面
に阻害されずに軸線方向に移動し、素材をダイスから確
実に取り出すことができる。The shape of the die is configured so that the guide surface and the expanded region of the material are arranged at different positions in the circumferential direction. Therefore, when the material is taken out of the die after plastic working of the material, the expansion region of the material moves in the axial direction without being hindered by the guide surface, and the material can be taken out of the die without fail.
【図面の簡単な説明】[Brief description of the drawings]
【図１】この発明の実施例のダイスと軸部材との関係を
示す平面断面図である。FIG. 1 is a plan sectional view showing a relationship between a die and a shaft member according to an embodiment of the present invention.
【図２】この発明の実施例の全体構成を示す正面図であ
る。FIG. 2 is a front view showing the entire configuration of the embodiment of the present invention.
【図３】この発明の実施例に用いられるダイスを示す平
面図である。FIG. 3 is a plan view showing a die used in the embodiment of the present invention.
【図４】図３のIV−IV線における正面断面図である。FIG. 4 is a front sectional view taken along line IV-IV in FIG. 3;
【図５】図３のＶ−Ｖ線における右側面断面図である。FIG. 5 is a right side sectional view taken along line VV in FIG. 3;
【図６】この発明の実施例の全体構成を示す正面断面図
である。FIG. 6 is a front sectional view showing the entire configuration of the embodiment of the present invention.
【図７】この発明の実施例の全体構成を示す正面断面図
である。FIG. 7 is a front sectional view showing the entire configuration of the embodiment of the present invention.
５ 軸部材 ７ 第１ダイス １０ 素材挿入孔 １２ 案内面 １３ 円弧面 Ａ１ 軸線 5 Shaft member 7 First die 10 Material insertion hole 12 Guide surface 13 Arc surface A1 Axis line
Claims (1)
と、前記素材挿入孔の内面の円周方向の一部に形成さ
れ、かつ、前記素材の半径方向の膨張領域に当接する成
形面とを備え、前記素材挿入孔に挿入される前記素材を
前記成形面により塑性加工した後、前記素材が挿入時と
は逆方向に移動して前記素材挿入孔から抜き取られる構
成の自由押出し成形用ダイスにおいて、 前記素材挿入孔の内面の円周方向における前記成形面以
外の領域よりも前記素材挿入孔の入口側に、前記素材の
外周面に当接することにより、前記素材の軸線と、前記
素材挿入孔の軸線との傾斜を抑制する案内面が形成され
ていることを特徴とする自由押出し成形用ダイス。1. A material insertion hole into which a material is inserted in a predetermined direction, and a molding surface formed in a part of the inner surface of the material insertion hole in a circumferential direction and abutting on a radially expanded region of the material. After the material to be inserted into the material insertion hole is plastically processed by the molding surface, the material is moved in a direction opposite to the insertion direction and is removed from the material insertion hole for free extrusion molding. In the die, by contacting the outer peripheral surface of the material on the inlet side of the material insertion hole from a region other than the molding surface in the circumferential direction of the inner surface of the material insertion hole, the axis of the material, and the material A die for free extrusion molding, wherein a guide surface for suppressing the inclination of the insertion hole with respect to the axis is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20216097A JP3564955B2 (en) | 1997-07-11 | 1997-07-11 | Free extrusion die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20216097A JP3564955B2 (en) | 1997-07-11 | 1997-07-11 | Free extrusion die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1133666A true JPH1133666A (en) | 1999-02-09 |
| JP3564955B2 JP3564955B2 (en) | 2004-09-15 |
Family
ID=16452961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20216097A Expired - Fee Related JP3564955B2 (en) | 1997-07-11 | 1997-07-11 | Free extrusion die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3564955B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102177155B1 (en) * | 2019-09-03 | 2020-11-10 | 김영길 | Cold Forging Extruding Mold |
-
1997
- 1997-07-11 JP JP20216097A patent/JP3564955B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102177155B1 (en) * | 2019-09-03 | 2020-11-10 | 김영길 | Cold Forging Extruding Mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3564955B2 (en) | 2004-09-15 |
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