JP2724229B2 - End cutting method for cylindrical drawn products - Google Patents
End cutting method for cylindrical drawn productsInfo
- Publication number
- JP2724229B2 JP2724229B2 JP2007612A JP761290A JP2724229B2 JP 2724229 B2 JP2724229 B2 JP 2724229B2 JP 2007612 A JP2007612 A JP 2007612A JP 761290 A JP761290 A JP 761290A JP 2724229 B2 JP2724229 B2 JP 2724229B2
- Authority
- JP
- Japan
- Prior art keywords
- work
- die
- cutting
- punch
- cylindrical
- 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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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、円筒絞り品の端面切断方法に関し、詳しく
は、プレス加工によるモータ・ケース等の絞り加工品の
円筒部端面を、口元の歪みやバリの発生を防止した状態
で切断するものであり、特に、切断端面に平面度、直角
および円筒部の真円度が高精度に要求される場合におい
て、切断後に切削加工することなく切断端面の精度を確
保することが出来るようにするものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting an end face of a cylindrically drawn product, and more particularly, to a method of cutting a cylindrical end face of a drawn product such as a motor case by press working, for example, by deforming a mouth or removing a burr. Cutting is performed in a state where the occurrence of cracks is prevented. Particularly, when flatness, right angle and roundness of the cylindrical portion are required for the cutting end surface with high accuracy, the accuracy of the cutting end surface without cutting after cutting is required. Is to be able to secure.
従来の技術 従来、この種の開口端縁にフランジを有する円筒部か
らフランジを含む不要部を切断する方法としては、シミ
ートリミング、ピンチトリミングおよびフラッシュトリ
ミングが提供されている。2. Description of the Related Art Conventionally, shimmy trimming, pinch trimming, and flash trimming have been provided as methods for cutting unnecessary portions including a flange from a cylindrical portion having a flange at an opening edge.
上記シミートリミングは、第11図に示すように、ワー
ク１の円筒部1a内にパンチ２を挿入すると共に、該円筒
部1aにダイ３を被せ、カム機構（図示せず）により上記
パンチ２を円を描くように可動させて、ワーク１のフラ
ンジ部1bを円筒部1aの端面より切断、除去している。In the shimming trimming, as shown in FIG. 11, a punch 2 is inserted into a cylindrical portion 1a of a work 1, a die 3 is put on the cylindrical portion 1a, and the punch 2 is set by a cam mechanism (not shown). The workpiece 1 is moved so as to draw a circle, and the flange portion 1b of the work 1 is cut and removed from the end face of the cylindrical portion 1a.
上記ピンチトリミングは、第12図に示すように、パン
チ４に外嵌したワーク１の円筒部1aに、該円筒部外径と
ほぼ同寸法の内径を有するダイ６を被せて下方に移動さ
せることにより、ワーク１のフランジ部1bを円筒部1aの
端面より切断、除去している。In the above-described pinch trimming, as shown in FIG. 12, a cylindrical portion 1a of a work 1 externally fitted to a punch 4 is covered with a die 6 having an inner diameter substantially the same as the outer diameter of the cylindrical portion and moved downward. As a result, the flange portion 1b of the work 1 is cut and removed from the end surface of the cylindrical portion 1a.
上記フラッシュトリミングは、第13図に示すように、
上記ピンチトリミングと同様に、パンチ４′に被せたワ
ーク１の円筒部1aに、該円筒部1aの外径より大きいダイ
６′を下方に移動させることにより、ワーク１のフラン
ジ部1bを剪断して円筒部1aより切断、除去している。The flash trimming is performed as shown in FIG.
Similarly to the above-described pinch trimming, the flange portion 1b of the work 1 is sheared by moving the die 6 'larger than the outer diameter of the cylindrical portion 1a downward on the cylindrical portion 1a of the work 1 placed on the punch 4'. From the cylindrical portion 1a.
発明が解決しようとする課題 上記した従来の各トリミングには夫々問題点がある。
即ち、上記シミートリミングでは切刃を軸線方向に対し
て直交する前後左右に移動させ、円周方向に歪ませなが
ら切断しているため、円筒部切断端面に軸方向のバリは
発生しないが、端面の口元の真円度が低く、後加工に端
面口元部の歪修正工程が必要となる。また、ピンチトリ
ミングおよびフラッシュトリミングでは、円筒部の軸線
に沿ってダイが移動してフランジ部をせん断加工するた
め、真円度は悪化しないが、端面に軸線方向のバリが発
生する。このバリにより切断端面の平面度が悪化して精
度上問題があるため、トリミング加工の後に切削などの
バリ取り工程が必要となる。Problems to be Solved by the Invention Each of the conventional trimmings described above has a problem.
That is, in the above shimmy trimming, the cutting blade is moved back and forth and right and left perpendicular to the axial direction and cut while distorting in the circumferential direction. The roundness of the mouth is low, and a post-processing step for correcting the distortion of the mouth of the end face is required. In the pinch trimming and the flash trimming, since the die moves along the axis of the cylindrical portion to shear the flange portion, roundness is not deteriorated, but burrs are generated on the end face in the axial direction. Since the flatness of the cut end face is deteriorated due to the burrs and there is a problem in accuracy, a deburring step such as cutting is required after the trimming.
上記のように、従来用いられている方法では、高精度
の円筒絞り加工品が要求される場合、いずれも切断工程
の後に後加工工程が必要となり、工程数が増え、作業効
率が悪いと共にコスト高になる等の欠点があった。As described above, in the conventional method, when a high-precision cylindrical drawn product is required, a post-processing step is required after each cutting step, which increases the number of steps, reduces work efficiency, and reduces cost. There were drawbacks such as becoming high.
本発明は、上記のような従来の円筒絞り加工品の端面
切断方法に於ける問題を解決して、該端面の口元の真円
度が高く、かつ、バリの発生がなく、端面の平面度を向
上することができる円筒絞り加工品の切断方法を提供す
ることを目的とするものである。The present invention solves the above-mentioned problems in the conventional method for cutting an end face of a cylindrical drawn product, and has a high roundness at the mouth of the end face, no burr generated, and a flatness of the end face. It is an object of the present invention to provide a method for cutting a cylindrical drawn product, which can improve the quality.
課題を解決するための手段 上記目的を達成するため、本発明は、板材を加工して
形成した、一端開口端縁にフランジ部を有する円筒状ワ
ークから、そのフランジ部を切断する方法であって、 上記ワークを段付きのパンチに被せた状態で、先端開
口部の内端にアールを設けた円筒状の第１ダイにより絞
りシゴキ加工を行い、ワークに段差部と該段差部の外側
に薄肉のくびれ部を形成する段付け工程を行った後、 上記段差部が形成されたワークを段付きのパンチに被
せた状態で、先端開口部の内端が直角又は鋭角である円
筒状の第２ダイをワークに被せて、上記段差部へ移動さ
せ、フランジ部を切断する縁切り工程を行うことを特徴
とする円筒絞り品の端面切断方法を提供するものであ
る。Means for Solving the Problems In order to achieve the above object, the present invention is a method for cutting a flange portion from a cylindrical work having a flange portion at one open end formed by processing a plate material. In a state where the work is placed on a stepped punch, drawing squeezing is performed by a cylindrical first die provided with a radius at the inner end of the tip opening, and a thin portion is formed on the work at the step portion and outside the step portion. After performing the step of forming the constricted portion, the work in which the stepped portion is formed is placed on a stepped punch, and the inner end of the distal end opening is at a right angle or an acute angle. It is an object of the present invention to provide a method for cutting an end face of a cylindrically drawn product, wherein a die is put on a workpiece, moved to the step portion, and an edge cutting step for cutting a flange portion is performed.
上記した方法において、特に、段付け工程に用いる第
１ダイは、その先端開口部内端のアールを大きく設定し
ており、該アールと、シゴキ量と、第１ダイの内径と段
付きパンチの大径部の外径と段差部隙間とを適宜に設定
することにより、段付け工程において、端面出しと薄肉
のくびれ部を形成していることを特徴としている。In the above-mentioned method, in particular, the first die used in the stepping step has a large radius at the inner end of the tip opening, and the radius, the amount of squeezing, the inner diameter of the first die, and the size of the stepped punch are large. By appropriately setting the outer diameter of the diameter portion and the gap between the step portions, an end face is formed and a thin constricted portion is formed in the stepping step.
また、上記方法において、縁切り工程では、くびれ部
に亀裂を発生させて剥がれるように切断するために、第
２ワークの内径と段付きパンチの大径部の外径の間隔お
よび、該段付きパンチの大径部の外径とワーク円筒部の
外径との間隔を適宜に設定することを特徴としている。In the above method, in the edge cutting step, the gap between the inner diameter of the second work and the outer diameter of the large-diameter portion of the stepped punch and the stepped punch are formed in order to cut the constricted portion so as to be peeled off. The distance between the outer diameter of the large-diameter portion and the outer diameter of the work cylindrical portion is appropriately set.
作用 上記した切断方法を用いた場合、第１の絞りシゴキを
行う段付け工程で、切断面内端の端面出しを行うことが
出来、よって、切断端面にダレの発生を防止出来る。ま
た、縁切り工程で、亀裂を発生させてはがれるように切
断するために切断端面にバリが発生することが防止出来
る。よって、バリ取りのための後加工を不要とすること
が出来る。In the case where the above-described cutting method is used, the inner end of the cut surface can be exposed in the step of performing the first drawing squeezing, so that the occurrence of sagging on the cut end surface can be prevented. Further, in the edge cutting step, since the cutting is performed so as to generate a crack and peel off, it is possible to prevent burrs from being generated on the cut end surface. Therefore, post-processing for deburring can be omitted.
実施例 次に、本発明に係わる切断方法を図面を参照して詳細
に説明する。Next, a cutting method according to the present invention will be described in detail with reference to the drawings.
本発明は、板材をプレス加工して形成した、一端開口
端縁にフランジを有する円筒状の被加工品（以下、ワー
クと称する）40を、その円筒部40aの下側部を切断し、
円筒部40aの下端全周のフランジ部40bを含む不要部分を
円筒部40aより切断・除去するもので、該ワーク40は本
実施例では純鉄からなる。The present invention is a cylindrical workpiece (hereinafter, referred to as a workpiece) 40 having a flange at one open end formed by pressing a plate material, and cutting a lower portion of the cylindrical portion 40a.
An unnecessary portion including the flange portion 40b of the entire lower end of the cylindrical portion 40a is cut and removed from the cylindrical portion 40a, and the work 40 is made of pure iron in this embodiment.
本発明に係わる切断方法は、第１工程の段付け工程と
第２工程の縁切り工程とからなり、上記第１工程では、
第１図に示す第１ダイ10と段付きパンチ30を用いる一
方、上記第２工程では第２図に示す第２ダイ20と上記段
付きパンチ30と同一形状の段差付きのパンチ30′を用い
ている。The cutting method according to the present invention includes a first step setting step and a second step edge cutting step.
While the first die 10 and the stepped punch 30 shown in FIG. 1 are used, the second step uses the second die 20 and the stepped punch 30 'having the same shape as the stepped punch 30 shown in FIG. ing.
上記第１ダイ10は両端開口の円筒形状でワーク40をパ
ンチ30に被せた状態で、該ワーク40とパンチ30を挿入す
る円形孔10aを有し、該円形孔10aの先端開口部の内端に
は大きなアール10bを設けている。第２ダイ20は第１ダ
イ10と略同形状の円筒形状で、パンチ30′に被せたワー
ク40を挿入する円形孔20aを有しているが、該円形孔20a
の開口部内端は直角部20bとしてアールを設けていな
い。ただし、開口部内端は直角に限らず鋭角としてもよ
い。パンチ30は円柱状で、その上側部を小径部30aとす
ると共に下側部を大径部30bとし、その間に段差部30cを
設けている。The first die 10 has a circular hole 10a into which the work 40 and the punch 30 are inserted in a state in which the work 40 is covered with the punch 30 in a cylindrical shape having both ends open, and the inner end of the tip opening of the circular hole 10a. Has a large radius 10b. The second die 20 has a cylindrical shape having substantially the same shape as the first die 10 and has a circular hole 20a for inserting the work 40 placed on the punch 30 '.
The inner end of the opening is not provided with a radius as a right angle portion 20b. However, the inner end of the opening is not limited to a right angle but may be an acute angle. The punch 30 has a columnar shape, and has an upper portion serving as a small-diameter portion 30a, a lower portion serving as a large-diameter portion 30b, and a step portion 30c provided therebetween.
上記パンチ30の小径部30aの外径A1は、ワーク40の円
筒部40aの内径B1より僅かに小さく設定し、その間に空
隙C1が生じるように設定していると共に、大径部30bの
外径A2は上記ワーク円筒部40aの内径B1と略同一に設定
し、互いに当接するように設定している。Outer diameter A 1 of the small-diameter portion 30a of the punch 30 is set slightly smaller than the inner diameter B 1 of the cylindrical portion 40a of the workpiece 40, with are set as the gap C 1 occurs during which the large diameter portion 30b outer diameter a 2 of set substantially equal to the inner diameter B 1 of the workpiece cylindrical portion 40a, it is set so as to contact each other.
また、第１ダイ10の内径D1はワーク円筒部40aの外径B
2より僅かに小さく設定し、ワーク円筒部40aに第１ダイ
20を外嵌した時にワーク円筒部40aを絞りながらシゴキ
をかける寸法に設定している。かつ、該第１ダイ10の内
径D1は、パンチ30の大径部外径A2より僅かに大きく設定
し、その間に段差部隙間C2が生じる寸法に設定してい
る。該第１ダイ10の開口端縁に設けるアール10bはアー
ルを大きく設定し、上記段差部隙間C2とシゴキ量との相
互関係より、後述するワーク切断部内周部の端面出しを
行い、該内周部に発生するダレを小さくすると共に、上
記段差部30cとアール10bとの間に形成されるワークのく
びれ部に亀裂が入る直前の厚さとなるように設定してい
る。また、第２ダイ20の内径E1は、パンチ大径部外径A2
より僅かに大きく設定し、その間にクリアランスC3が生
じるように設定している。The inner diameter D 1 of the first die 10 is the outer diameter of the workpiece cylindrical portion 40a B
Set it slightly smaller than 2 and attach the first die to the work cylinder 40a.
The dimension is set so as to squeeze while squeezing the work cylindrical portion 40a when fitting 20 outside. And the inner diameter D 1 of the first die 10 set slightly larger than the large diameter portion outer diameter A 2 of the punch 30 is set to dimensions step portion clearance C 2 occurs therebetween. Earl 10b provided on the opening edge of the first die 10 is set larger radius than the mutual relationship between the step portion clearance C 2 and ironing amount, performs the end face out of the work cut inner peripheral portion which will be described later, the inner The sag generated in the peripheral portion is reduced, and the thickness is set so that the constriction of the work formed between the step portion 30c and the radius 10b has a thickness immediately before a crack is formed. The inner diameter E 1 of the second die 20 is the outer diameter A 2 of the punch large diameter portion.
Set more slightly larger, it is set so that the clearance C 3 occurs therebetween.
次に、上記ダイおよびパンチを用いた本実施例の切断
工程を具体的に説明する。Next, the cutting step of the present embodiment using the die and the punch will be specifically described.
本実施例のワーク40の端面切断方法は、上記したよう
に段付けの第１工程と縁切り工程の第２工程の２つの工
程からなる。As described above, the method for cutting the end face of the work 40 according to the present embodiment includes the two steps of the first step of the stepping and the second step of the edge cutting step.
段付けの第１工程では、第３図に示すように、図中、
下端開口のワーク40の円筒部40a内にパンチ30を下方よ
り挿入した後、第１ダイ10を上方より矢印で示すよう
に、パンチ30に被せたワーク40の外周面に沿って外嵌し
下方へ移動していく。In the first step of stepping, as shown in FIG.
After the punch 30 is inserted from below into the cylindrical portion 40a of the work 40 having the lower end opening, the first die 10 is externally fitted along the outer peripheral surface of the work 40 over the punch 30 as shown by an arrow from above. Move to.
この時、前記したように、パンチ30の小径部30aの外
周面とワーク円筒部40aの内周面との間に空隙C1が生じ
させていると共に、第１ダイ10の内径D1をワーク円筒部
40aの外径B2より小さく設定しているため、第１ダイ10
が下方へ移動することにより、ワーク40が絞られながら
シゲキがかけられる。よって、ワーク円筒部40a′の内
外径の寸法は、パンチ小径部30の外径A1により規定され
た内径と、第１ダイ10の内径D1に規定された外径と対応
したものとなる。At this time, as described above, between the outer surface and the inner peripheral surface of the workpiece cylindrical portion 40a of the small diameter portion 30a of the punch 30 with the gap C 1 is caused, the inner diameter D 1 of the first die 10 work Cylindrical part
Due to the smaller than the outer diameter B 2 of 40a, the first die 10
Is moved downward, so that the work 40 is squeezed and squeezed. Thus, the dimensions of the inner and outer diameters of the workpiece cylindrical portion 40a 'is formed of an inner diameter defined by the outer diameter A 1 of the punch small diameter portion 30, the outer diameter defined in the inner diameter D 1 of the first die 10 and those corresponding .
上記第１ダイ10の下降時に、パンチ30に段差部30cが
あるため、第１ダイ10の下降を完了した時に第５図に示
す如く段差がつき、くびれ部を生じている。該段差発生
部分において、第４図に示す如く、第１ダイ10によりワ
ーク40の側壁をしごいており、該シゴキにより生じた材
料の流れは、即ち、余肉が図中矢印で示す如くパンチ段
差部30cの隅部30dに集まる。該余肉の流れは上記シゴキ
量Ｚの他、第１ダイ10の内径Ｄとパンチ大径部30bの外
径A1との段差部隙間C2と、第１ダイ10の開口端のアール
部10bのアールとの３つの要因によって規定される。こ
れらの要因を適宜に設定して、段差部30cの直角な隅部3
0dがほぼ充填される程度に余肉を集めているため、第６
図に示す如く、ワーク円筒部40aに形成される段差部40c
の内端面40dの端面出しが為される。よって、後述する
如く、該段差部40cでワークを切断した時に、開口端の
内端の直角出しが可能となり、ダレの発生をほぼ防止す
ることが出来る。When the first die 10 is lowered, the punch 30 has a step 30c, so that when the first die 10 is completely lowered, a step is formed as shown in FIG. At the stepped portion, as shown in FIG. 4, the side wall of the workpiece 40 is pressed by the first die 10, and the flow of the material generated by the squeezing is, as shown in FIG. It gathers at the corner 30d of the step 30c.該余meat flow in addition to the above ironing quantity Z, the stepped portion clearance C 2 between the outer diameter A 1 of the inner diameter D and the punch large diameter portion 30b of the first die 10, rounded portion of the open end of the first die 10 It is defined by three factors with 10b are. These factors are set appropriately, and the right angle corner 3
Since the excess is collected so that 0d is almost filled,
As shown in the figure, a step portion 40c formed in the work cylindrical portion 40a
Of the inner end surface 40d is made. Therefore, as described later, when the work is cut at the step portion 40c, the inner end of the open end can be set at a right angle, and the occurrence of sag can be substantially prevented.
かつ、該段付け工程において、パンチ大径部30bの上
端角部30eと第１ダイ10のアール部10bとの間に生じるワ
ーク40のくびれ部40eには、該部分に亀裂が発生しない
直前で、第１ダイ10の下降を停めている。Further, in the stepping step, the constricted portion 40e of the work 40 generated between the upper end corner portion 30e of the large-diameter portion 30b of the punch and the round portion 10b of the first die 10 immediately before a crack is generated in the portion. , The descending of the first die 10 is stopped.
尚、上記段付けの第１工程において、第１ダイ10のア
ール部10bのアール、シゴキ量Ｚおよび段差部隙間C2を
変えて、ダレ長さＰを測定した結果は下記の表に示す通
りであった。In the first step of the stepped, rounded the rounded portion 10b of the first die 10, by changing the ironing amount Z and the stepped portion clearance C 2, as shown in the following table the results of measurement of the sag length P Met.
上記実験データより、第１ダイ10のアール部のアール
を20mm、シゴキ量Ｚを0.21mm、段差部隙間C2を0.05mmあ
るいは0.075mmに設定した場合に、ダレ長さＰは0.34mm
となり、極めて小さく抑えられ、ほぼダレが発生してい
ないと言える。 From the above experimental data, in the case of setting the radius of the rounded portion of the first die 10 20 mm, the ironing amount Z 0.21 mm, the stepped portion clearance C 2 to 0.05mm or 0.075 mm, sag length P is 0.34mm
, And it can be said that the dripping is almost completely suppressed.
上記第１工程の段付け工程により、段差部の形成と端
面出しを行った後、第７図から第９図に示す第２工程の
縁切り工程を第２ダイ20と、上記パンチ30と同寸法のパ
ンチ30′を用いて行う。即ち、第２図に示すように、ワ
ーク40の円筒部40a′を上記パンチ30′に被せた状態
で、第２ダイ20を下方へ移動させる。該第２ダイ20の直
角部20bとしているため、ワーク40の円筒部40aの口元側
面を削りながら下降していく。第２ダイ20が第７図に達
すると、第８図に示すようにワーク40のくびれ部40eに
亀裂40fが生じ、該亀裂40fが進行してワーク40からフラ
ンジ部分40bを含む下方の不要部分が切り離される。該
切り離しは通常の剪断加工と異なり、亀裂40fにより剥
がれるように起こるため、バリが立たない。よって、切
断部の外周端には軸方向のバリは発生しない。After the formation of the step portion and the end surface exposing by the stepping step of the first step, the edge cutting step of the second step shown in FIGS. 7 to 9 has the same dimensions as the second die 20 and the punch 30. Using a punch 30 '. That is, as shown in FIG. 2, the second die 20 is moved downward while the cylindrical portion 40a 'of the work 40 is placed on the punch 30'. Since the second die 20 is formed at the right angle portion 20b, the work 40 descends while shaving the side surface of the mouth of the cylindrical portion 40a. When the second die 20 reaches FIG. 7, a crack 40f is formed in the constricted portion 40e of the work 40 as shown in FIG. 8, and the crack 40f progresses, and unnecessary portions below the work 40 including the flange portion 40b are included. Is disconnected. Unlike the normal shearing, the separation occurs so as to be peeled off by the crack 40f, so that no burrs are formed. Therefore, no axial burr occurs at the outer peripheral end of the cut portion.
上記縁切り工程においてワークくびれ部40eに亀裂40f
を発生させて剥がれるように切断している。該切断時に
バリを発生させない要因としては、第９図に示すように
第２ダイ20の内径E1とポンチ大径部30bの外径A1との間
の間隔（クリアランス）C3と、段差板厚C4を適切に設定
することである。実験データからはクリアランスC3を0.
025mm、段差板厚C4を0.05mmとした場合、バリ高さは0.0
05±0.007mmで殆んどバリを発生させないと言える。A crack 40f is formed in the constricted portion 40e of the work in the edge cutting process.
And cut so as to peel off. Factors that do not generate burrs during the cutting, the distance (clearance) C 3 between the outer diameter A 1 of the inner diameter E 1 and punch the large diameter portion 30b of the second die 20 as shown in FIG. 9, step the thickness C 4 is to set appropriately. From the experimental data, the clearance C 3 was set to 0.
025Mm, if a step thickness C 4 was 0.05 mm, the burr height is 0.0
It can be said that almost no burrs are generated at 05 ± 0.007 mm.
上記のように、本発明に係わる切断方法によれば、切
断端面は第10図に示す形状となり、第１の段付け工程に
おいて端面出しが行なわれるため、切断端面内周100に
ダレの発生を最小に抑えることが出来ると共に、第２の
縁切り工程において切断端面外周101にバリが発生する
ことを防止出来る。よって、切断端面の平面度および直
角度を精度良く保つことが出来ると共に、バリ取り等の
後加工が不要となる。As described above, according to the cutting method according to the present invention, the cut end face has the shape shown in FIG. 10, and the end face is formed in the first stepping step. It is possible to minimize the occurrence of burrs on the outer periphery 101 of the cut end surface in the second edge cutting step. Therefore, the flatness and the perpendicularity of the cut end surface can be accurately maintained, and post-processing such as deburring is not required.
効果 以上の説明から明らかなように、本切断方法によれ
ば、段付きパンチと、開口先端の内端に大きなアールを
設けた第１ダイを用いて、第１の段付け工程を行うこと
により、切断端面にダレの発生を防止出来ると共に、亀
裂が入りやすい薄肉のくびれ部を形成出来る。また、段
付きパンチと開口先端の内端を直角又は鋭角とした第２
ダイを用いて第２の縁切り工程を行うことにより、はが
れるように切断するため、切断端面にバリの発生を防止
することが出来る。このように切断端面にダレおよびバ
リが発生しないため、切断端面の平面度、直角度を精度
よく保持でき、かつ、ダイとパンチを組み合わせて円筒
部の寸法を設定寸法となるように絞りながら切断してい
るため、寸法精度が良いと共に、真円度も高く、高精度
の円筒絞り加工品を提供することが出来る。また、上記
したように、切断端面にバリが発生していないため、切
断加工後に、バリ取りのための切削工程を不要とするこ
とができる利点も有するものである。Effects As is apparent from the above description, according to the present cutting method, the first stepping step is performed by using the stepped punch and the first die provided with a large radius at the inner end of the opening end. In addition, it is possible to prevent the occurrence of dripping on the cut end face and to form a thin constricted portion where cracks are easily formed. In addition, the stepped punch and the second end in which the inner end of the opening end is a right angle or an acute angle
By performing the second edge cutting step using a die, the cutting is performed so as to be peeled off, so that generation of burrs on the cut end surface can be prevented. Since no dripping and burrs are generated on the cut end surface, the flatness and squareness of the cut end surface can be accurately maintained, and cutting is performed by drawing together with a die and a punch so that the cylindrical portion has a set size. As a result, the dimensional accuracy is good, the roundness is high, and a highly accurate cylindrical drawn product can be provided. Further, as described above, since burrs are not generated on the cut end surface, there is an advantage that a cutting step for removing burrs after cutting is unnecessary.
第１図はワーク、第１ダイおよび段付きパンチを示す断
面図、第２図は第２ダイとワークを被せた段付きパンチ
を示す断面図、第３図は第１の段付け工程を示す概略断
面図、第４図は段付け工程の要部を示す拡大図、第５図
は段付け工程が終了した状態を示す断面図、第６図は段
付け工程で加工されたワークの要部拡大図、第７図は愛
２の縁切り工程を示す概略断面図、第８図は縁切り工程
の要部拡大図、第９図は縁切り工程に用いる第２ダイと
段付きパンチの寸法関係を示す図面、第10図は切断され
た端面の拡大図、第11図、第12図および第13図は従来の
切断方法を示す概略図である。 10……第１ダイ、10b……アール部、20……第２ダイ、2
0b……直角部、30、30′……段付きパンチ、30a……小
径部、30b……大径部、30c……段差部、40……ワーク、
40a、40a′……円筒部、40b……フランジ部、40c……段
差部、40d……端面、40e……くびれ部。FIG. 1 is a sectional view showing a work, a first die and a stepped punch, FIG. 2 is a sectional view showing a stepped punch covering a second die and a work, and FIG. 3 shows a first stepping step. Schematic sectional view, FIG. 4 is an enlarged view showing a main part of a stepping process, FIG. 5 is a cross-sectional view showing a state where the stepping process is completed, and FIG. 6 is a main part of a work processed in the stepping process. Enlarged view, FIG. 7 is a schematic cross-sectional view showing an edge cutting process of love 2, FIG. 8 is an enlarged view of a main part of the edge cutting process, and FIG. 9 shows a dimensional relationship between a second die and a stepped punch used in the edge cutting process. Drawing, FIG. 10 is an enlarged view of the cut end face, and FIGS. 11, 12, and 13 are schematic views showing a conventional cutting method. 10: 1st die, 10b: Round part, 20: 2nd die, 2
0b: right angle portion, 30, 30 ': stepped punch, 30a: small diameter portion, 30b: large diameter portion, 30c: stepped portion, 40: workpiece,
40a, 40a '... cylindrical part, 40b ... flange part, 40c ... step part, 40d ... end face, 40e ... ... constricted part.
Claims (1)
フランジ部を有する円筒状ワークから、そのフランジ部
を切断する方法であって、 上記ワークを段付きのパンチに被せた状態で、先端開口
部の内端にアールを設けた円筒状の第１ダイにより絞り
シゴキ加工を行い、ワークに段差部と該段差部の外側に
薄肉のくびれ部を形成する段付け工程を行った後、 上記段差部が形成されたワークを段付きのパンチに被せ
た状態で、先端開口部の内端が直角又は鋭角である円筒
状の第２ダイをワークに被せて、上記段差部へ移動さ
せ、フランジ部を切断する縁切り工程を行うことを特徴
とする円筒絞り品の端面切断方法。1. A method for cutting a flange from a cylindrical work having a flange at one open end formed by processing a plate material, wherein the work is placed on a stepped punch. After performing a drawing squeezing process with a cylindrical first die provided with a radius at the inner end of the tip opening, and performing a stepping step of forming a step portion on the work and a thin constricted portion outside the step portion. In a state in which the work having the step portion formed thereon is covered with a stepped punch, a cylindrical second die having an inner end of a front end opening at a right angle or an acute angle is placed on the work and moved to the step portion. A method for cutting an end face of a cylindrically drawn product, comprising performing an edge cutting step of cutting a flange portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007612A JP2724229B2 (en) | 1990-01-17 | 1990-01-17 | End cutting method for cylindrical drawn products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007612A JP2724229B2 (en) | 1990-01-17 | 1990-01-17 | End cutting method for cylindrical drawn products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03210920A JPH03210920A (en) | 1991-09-13 |
| JP2724229B2 true JP2724229B2 (en) | 1998-03-09 |
Family
ID=11670635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007612A Expired - Fee Related JP2724229B2 (en) | 1990-01-17 | 1990-01-17 | End cutting method for cylindrical drawn products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2724229B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101897244B1 (en) * | 2018-05-09 | 2018-09-10 | 온창용 | Drawing forming apparatus for cap |
| CN110814149A (en) * | 2019-10-28 | 2020-02-21 | 苏州捷尔力实业有限公司 | Machine shell thick material blanking process |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1882535B1 (en) * | 2006-07-26 | 2010-05-05 | Impress Group B.V. | Method and apparatus for forming a steel pressure container, such steel pressure container and a preform therefor |
| JP2008114241A (en) * | 2006-11-02 | 2008-05-22 | Honda Motor Co Ltd | Press forming method |
| DE102011050001A1 (en) * | 2011-04-29 | 2012-10-31 | Thyssenkrupp Steel Europe Ag | Method and device for producing flangeless drawn parts |
| US20150102517A1 (en) * | 2012-05-22 | 2015-04-16 | Yamasei Corporation | Metal mold for carbon fiber reinforced plastic component and method of manufacturing carbon fiber reinforced plastic component |
| JP6624765B1 (en) * | 2019-06-27 | 2019-12-25 | 石崎プレス工業株式会社 | Terminals and strip-shaped terminal members |
-
1990
- 1990-01-17 JP JP2007612A patent/JP2724229B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101897244B1 (en) * | 2018-05-09 | 2018-09-10 | 온창용 | Drawing forming apparatus for cap |
| CN110814149A (en) * | 2019-10-28 | 2020-02-21 | 苏州捷尔力实业有限公司 | Machine shell thick material blanking process |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03210920A (en) | 1991-09-13 |
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