JPS6330128A - Control method for bulging with high accuracy - Google Patents
Control method for bulging with high accuracyInfo
- Publication number
- JPS6330128A JPS6330128A JP61171617A JP17161786A JPS6330128A JP S6330128 A JPS6330128 A JP S6330128A JP 61171617 A JP61171617 A JP 61171617A JP 17161786 A JP17161786 A JP 17161786A JP S6330128 A JPS6330128 A JP S6330128A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- mold
- molding
- force
- cylinder
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims description 44
- 239000003566 sealing material Substances 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000000452 restraining effect Effects 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、バルジ成形における制御方法により。[Detailed description of the invention] [Industrial application field] The present invention uses a control method in bulge forming.
特に、金型の分割面での開きを抑制し、更に変形を小さ
くすることにより、精密で、しかも、高精度を要する金
属材等のバルジ成形に好適な制御方法に関する。In particular, the present invention relates to a control method suitable for precise bulge forming of metal materials, etc., which requires high accuracy, by suppressing the opening of the dividing plane of the mold and further reducing deformation.
寺沢、松浦共著の「材料力学」では１円筒の補強法とし
て外筒と内筒のすき間に圧力を付加する方法を示してい
るが１分割された金型については触れてはいない。``Mechanics of Materials,'' co-authored by Terasawa and Matsuura, describes a method of applying pressure to the gap between the outer and inner cylinders as a method of reinforcing one cylinder, but does not mention a single-part mold.
また、従来のバルジ成形装置では、特開昭５６−１５４
２２８号公報に示すように、分割金型を機械的な拘束装
置により拘束しており、金型内部の加工材料に高い内圧
が付加さ九た場合、金型には大きな変形が生じ、高精度
な成形ができない問題があった。In addition, in conventional bulge forming equipment,
As shown in Publication No. 228, the split mold is restrained by a mechanical restraint device, and when high internal pressure is applied to the processed material inside the mold, large deformation occurs in the mold, resulting in high precision. There was a problem that it was not possible to form a mold.
従来のバルジ成形では、分割金型を外周からテーパをも
つ拘束リング等で、バルジ成形圧による金型の開き、変
形を拘束していた。バルジ成形により、ワークは金型の
内径に密着する様に変形し、そのバルジ成形圧により分
割された金型は、拘束リング等により金型の外周を拘束
するにもかかわらず、金型、拘束リングの寸法のバラツ
キ、接触面の荒さ、平行度、締付は力等により、拘束リ
ングによる分割金型の相対的な締付は力が不均一になり
、更に、拘束リングの弾性変形により、バルジ成形圧に
より、分割金型に開き、変形が発生するため、成形後の
ワークは寸法精度が悪く、高精度を要する成形に対して
の配慮がされていなかった。In conventional bulge forming, a restraining ring or the like tapered from the outer periphery of the split mold was used to restrain the mold from opening or deforming due to bulge forming pressure. Due to bulge forming, the workpiece is deformed so as to fit closely to the inner diameter of the mold, and the mold is split due to the bulge forming pressure, even though the outer periphery of the mold is restrained by a restraining ring etc. Due to variations in ring dimensions, roughness of contact surfaces, parallelism, tightening force, etc., the relative tightening of the split mold by the restraining ring will result in uneven force, and furthermore, due to the elastic deformation of the restraining ring, Because the bulge molding pressure causes the split mold to open and deform, the workpiece after molding has poor dimensional accuracy, and no consideration has been given to molding that requires high precision.
本発明の目的は、高精度を要する金属成形品等のバルジ
成形を行なうため、拘束リング等による分割金型拘束方
法から、金型外周に圧力を付加することにより拘束する
方法を採用し、バルジ成形過程での制御を行なうことに
ある。The purpose of the present invention is to adopt a method of restraining the mold by applying pressure to the outer circumference of the mold, instead of a split mold restraint method using restraint rings, etc., in order to perform bulge molding of metal molded products that require high precision. The purpose is to control the molding process.
この問題を解決するため、分割面にシール材をもつ金型
の外周に、一体型厚肉円筒で覆い、両端面にシール材を
設けた端面板と、シール材を設けた加圧ロッド等で構成
されるバルジ成形装置において、成形準備段階として、
一体型厚肉円筒中で下金型を固定後、上金型をシリンダ
等により分割面に設けたシール材を変形させ４分割面が
接触する様な力で押し付け、シール材を設けた加圧ロッ
ドを金型内のワークにシリンダ等により接触させ。In order to solve this problem, we covered the outer periphery of the mold with sealant on the dividing surface with an integrated thick-walled cylinder, and installed an end plate with sealant on both ends, a pressure rod with sealant, etc. In the bulge forming apparatus configured, as a forming preparation stage,
After fixing the lower mold in an integrated thick-walled cylinder, the upper mold is pressed with a force such that the sealing material provided on the divided surfaces is deformed by a cylinder etc. so that the four divided surfaces come into contact, and the sealing material provided is pressurized. Bring the rod into contact with the workpiece inside the mold using a cylinder, etc.
更に、初期的なシール圧に耐えられる軸力を付加し、両
端面に設けたシール材を設けた端面板をシリンダ等によ
りシール材を変形させ１分割金型端面と、一体型厚肉円
筒を同時に接触するようにシール力を付加することによ
り１分割金型と一体型厚肉円筒とのギャップ、ワーク内
は全て密閉状態となる。その密閉された分割金型と一体
型厚内円筒とのギャップに液体、あるいは、気体を封じ
込め設定圧力まで上昇させた後、その設定圧力から計算
される分割金型を締付ける力より、成形圧力より計算さ
れる分割金型を開かせようとする力が小さくなる範囲で
１段階的に軸力を優先的に付加し、成形内圧を追従させ
て付加することにより、いかなる状態でも、成形圧力に
対抗して分割金型に締付は力が作用し、閉じた状態を保
持する。成形過程、除去過程において、金型を締付ける
圧力。Furthermore, an axial force that can withstand the initial sealing pressure is applied, and the end plate with sealing material provided on both end faces is deformed using a cylinder, etc. to form the one-piece mold end face and the integrated thick-walled cylinder. By applying a sealing force so that they come into contact at the same time, the gap between the one-piece mold and the integrated thick-walled cylinder and the inside of the workpiece are all sealed. After confining liquid or gas in the gap between the sealed split mold and the integrated thick inner cylinder and increasing the pressure to the set pressure, the molding pressure is greater than the force to clamp the split mold calculated from the set pressure. By preferentially adding axial force in one step within the range where the calculated force to open the split mold is small, and adding it with the molding internal pressure following, it is possible to counter the molding pressure under any conditions. A force is applied to the split mold to keep it closed. The pressure used to tighten the mold during the molding and removal processes.
成形内圧をフィードバックでチェックし、再度圧力を設
定圧力まで調整することにより、この目的は達成される
。This objective is achieved by checking the molding internal pressure with feedback and adjusting the pressure again to the set pressure.
分割金型内のワークに、成形圧力が付加され、ワークが
変形し１分割金型内面に接触後、密着する変形過程では
１分割金型は開く方向に大きな力が働き、変形量も大き
くなる。しかし、同時に分割金型外周面に圧力を付加し
た場合１分割金型内面に作用する圧力は５分割金型内に
周方向の引張応力を発生させるのに対して、分割金型外
周面に作用する圧力は分割金型内に周方向の圧縮応力を
発生させるのでそれぞれの応力が重なり合って分割金型
内部の応力は小さくなり変形も小さくなる。Molding pressure is applied to the workpiece in the split mold, the workpiece deforms, and after contacting the inner surface of the 1-part mold, during the deformation process in which it comes into close contact, a large force acts on the 1-part mold in the direction of opening, and the amount of deformation increases. . However, when pressure is applied to the outer circumferential surface of a split mold at the same time, the pressure acting on the inner surface of the 1-split mold generates circumferential tensile stress within the 5-split mold; This pressure generates compressive stress in the circumferential direction within the split mold, so the respective stresses overlap, reducing the stress inside the split mold and reducing deformation.
上記作用を満足させるため、第一に、分割金型をシリン
ダ等により締付け、分割面に設けたシール材を均一に変
形させ１分割面が互いに接触するか、あるいは、初期圧
に耐えられるためのシール力以上の力を付加し、第二に
１両端からＯリング等のシール材を設けた加圧ロッドを
シリンダ等により分割金型内にセットされたワークに接
触させ、成形内圧の初期圧に耐えられる力でワークに軸
力を付加することによりワーク端部のシールを行なう。In order to satisfy the above effect, first, the split mold is tightened with a cylinder or the like, and the sealing material provided on the split surfaces is uniformly deformed so that the split surfaces come into contact with each other, or A force greater than the sealing force is applied, and secondly, a pressure rod equipped with sealing material such as an O-ring from both ends is brought into contact with the workpiece set in the split mold using a cylinder, etc., and the initial molding internal pressure is adjusted. The ends of the workpiece are sealed by applying axial force to the workpiece with a force that can be withstood.
第三に、両端面に設けたパツキン、○リング。Thirdly, the packing and ○ rings provided on both end faces.
バックアップリング等のシール材をもった端面板を一回
、あるいは、数段階に押し付け１分割金型と一体型厚肉
角筒とのギャップのシール、分割金型端面のシールを同
時に行なう。An end plate with a sealing material such as a backup ring is pressed once or in several steps to simultaneously seal the gap between the one-piece mold and the integrated thick-walled rectangular tube and seal the end face of the divided mold.
第四に、成形過程に入るが、ワーク成形領域内で軸力を
優先的に付加し、成形圧力を軸力に追従し、フィードバ
ックで成形内圧金型を締付ける圧力を制御しながら、数
ステップ行なう。Fourth, the forming process begins, and several steps are performed by applying axial force preferentially within the workpiece forming area, making the forming pressure follow the axial force, and controlling the pressure that tightens the molding internal pressure mold with feedback. .
第五に、成形終了後、成形圧力を除去する過程では、成
形内圧を優先的に除去し、その圧力に追従して軸力を除
去し、フィードバックで成形圧力。Fifth, in the process of removing molding pressure after molding is completed, the molding internal pressure is removed preferentially, and the axial force is removed following that pressure, and the molding pressure is reduced by feedback.
金型を締付ける圧力を制御しながら、成形過程と反対の
経路で除去していく。While controlling the pressure that tightens the mold, it is removed in the opposite direction to the molding process.
第六に１分割金型と一体型厚肉円筒とのギャップ内の圧
力を除去し、第七に、分割金型の締付けを除去する。Sixth, the pressure in the gap between the one-piece mold and the integrated thick-walled cylinder is removed, and seventh, the tightening of the divided mold is removed.
以上、バルジ成形制御方法をとることにより、高精度な
バルジ成形を行なうことができる。By employing the bulge forming control method described above, highly accurate bulge forming can be performed.
以下、本発明の一実施例を第１図ないし第４図により説
明する。An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
第１図は、バルジ成形装置本体の構造を示し、その■−
■矢視断面を第２図に示す。一体型厚肉円筒４内に分割
された金型２，３を挿入し、上金型２をシリンダ１４で
持ち上げながら、ワーク１を分割金型２，３内にセット
する。第３図に成形フローチャート、第４図に成形タイ
ミングを示す。Figure 1 shows the structure of the bulge forming apparatus main body, and its ■-
■Figure 2 shows a cross-section viewed from the arrows. The divided molds 2 and 3 are inserted into the integrated thick-walled cylinder 4, and the workpiece 1 is set in the divided molds 2 and 3 while the upper mold 2 is lifted by the cylinder 14. FIG. 3 shows a molding flowchart, and FIG. 4 shows molding timing.
一体型厚肉円筒４の下部からシリンダ１５により下金型
３を固定２位置決めを行ない、更に、上金型３の分割面
に角形リング５のシール材を設け、シリンダ１４により
上金型２を力Ｆ１で締付けることにより、シール材５を
変形させ、下金型３に密着させる。その後、Ｏリング１
１を設けた加圧ロッド１０をシリンダ１２により送り出
し、ワーク１に接触させ、ワーク１に対して軸圧縮応力
を５ ｋｇ ｆ ／ ｒｍ”まで軸力を付加後、片端面
に０リング６と、パツキン８を設けた端面板９をシリン
ダ１３により、Ｏリング６、パツキン８を変形させ、分
割金型２，３と一体型厚肉円筒４の両端面に密着するま
で押し付ける。その押し付は力Ｆ２は。The lower mold 3 is fixed and positioned by the cylinder 15 from the lower part of the integrated thick-walled cylinder 4. Further, a sealing material of a rectangular ring 5 is provided on the dividing surface of the upper mold 3, and the upper mold 2 is fixed by the cylinder 14. By tightening with force F1, the sealing material 5 is deformed and brought into close contact with the lower mold 3. After that, O-ring 1
The pressurizing rod 10 provided with 1 is sent out by the cylinder 12, brought into contact with the work 1, and after applying an axial compressive stress to the work 1 up to 5 kg f/rm'', an O ring 6 is attached to one end surface, The end plate 9 provided with the packing 8 is pressed by the cylinder 13 by deforming the O-ring 6 and the packing 8 until it comes into close contact with both end surfaces of the split molds 2 and 3 and the integrated thick-walled cylinder 4.The pressing is done by force. F2 is.
分割金型２．３と一体型厚肉円筒４とのギャップより計
算される受圧面積Ａ ｏ、設定圧力Ｐｔ、更に、シール
材８の受圧面ｌ１Ａｔ、シール材８のガスケット係数を
Ｋとすると、 Ｆ ｚ ｇ Ａ ｏ Ｐ １＋ Ｋ Ａ
ＩＰ １で示される。以上の制御で、成形準備が完了
し、次に成形過程に入る。If the pressure receiving area Ao calculated from the gap between the split mold 2.3 and the integrated thick-walled cylinder 4, the set pressure Pt, the pressure receiving surface l1At of the sealing material 8, and the gasket coefficient of the sealing material 8 are K, then F z g A o P 1+ K A
Indicated by IP 1. With the above control, the preparation for molding is completed, and then the molding process begins.
まず、分割金型２，３と一体型厚肉円筒４とのギャップ
に水圧ポンプ１６により液体を注入し、ある設定圧力Ｐ
ｚで保持する。次に、ワーク１内に水圧ポンプ１７によ
り液体を注入し、分割金型２．３の締付力Ｆ１と設定圧
力Ｐｚより計算される力Ｆｓの合計Ｆ４より小さな力に
なる様な成形圧力Ｐ２まで、軸力を優先させて付加し、
ワーク１成形領域条件下まで、軸力に追従させて成形内
圧を付加する。−ステップ終了後、成形内圧、金型を締
付ける圧力Ｐ２のフィードバック制御を行ない次のステ
ップに移る。数ステップ連続的に繰返し、最終成形圧力
Ｐ８まで付加する。成形が終了してから、数秒間保持後
、成形過程と逆に成形内圧を優先的に除去し、その圧力
に追従して軸力を除去後、軸力のフィードバック制御を
行ない、数ステップ繰返し、成形圧、軸力を除去する。First, liquid is injected into the gap between the split molds 2 and 3 and the integrated thick-walled cylinder 4 using the hydraulic pump 16, and a certain set pressure P is applied.
Hold at z. Next, liquid is injected into the workpiece 1 by the hydraulic pump 17, and the molding pressure P2 is set such that the force becomes smaller than the sum F4 of the force Fs calculated from the clamping force F1 of the split mold 2.3 and the set pressure Pz. Prioritize and add axial force until
The molding internal pressure is applied to follow the axial force up to the workpiece 1 molding area conditions. - After the completion of the step, perform feedback control of the molding internal pressure and the pressure P2 for tightening the mold, and move on to the next step. Repeat several steps continuously to apply a final molding pressure of P8. After the molding is completed, after holding the mold for a few seconds, the molding internal pressure is preferentially removed in the opposite direction to the molding process, and after removing the axial force by following that pressure, feedback control of the axial force is performed, and several steps are repeated. Eliminate molding pressure and axial force.
その後、設定圧力Ｐ！を除去し、上金型２の締付は方Ｆ
１を除去し成形完了する。図中７はバックアップリング
。After that, set pressure P! Remove and tighten upper mold 2 using method F.
1 is removed and the molding is completed. 7 in the diagram is a backup ring.
本実施例によれば、分割金型２．３の開きを防止し、し
かも、変形を小さくすることができる。According to this embodiment, opening of the split mold 2.3 can be prevented and deformation can be reduced.
本発明によれば、高い成形内圧に対しても、分割金型の
開きを防止し、更に、変形も小さくすることができ、成
形過程でも、ワークの座屈等などの現象を抑制し、ワー
クの円滑な材料流れをうながし高精度なバルジ成形を行
なうことができる。According to the present invention, it is possible to prevent the split mold from opening even under high molding internal pressure, and also to reduce deformation, and also to suppress phenomena such as buckling of the workpiece during the molding process. It promotes smooth material flow and enables highly accurate bulge forming.
第１図は本発明の一実施例のバルジ成形装置の断面図、
第２図は第１図の■−■矢視断面図、第３図は成形フロ
ーチャート、第４図は成形タイムチャートを示す。
１・・・ワーク。FIG. 1 is a sectional view of a bulge forming apparatus according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is a molding flowchart, and FIG. 4 is a molding time chart. 1...Work.
Claims (1)
分割面にシール材を設けた金型と、前記金型と同一長さ
で、しかも、外径よりも大きな内径の一体型厚肉円筒と
両端からシール力を付加するために設けた加圧ロッドと
、前記金型と前記一体型厚肉円筒との両端面をシールす
るため、Ｏリング、パッキン等を設けた端面板より成る
バルジ成形装置において、 ワークセット後、前記一体型厚肉円筒の下部からシリン
ダ等により下金型を固定、位置決めし、上金型を締付後
、両端から先端にシール材を取付けた前記加圧ロッドを
ワークに接触させ、初期ワーク成形圧に対抗する軸力を
付加後、両端部からＯリング、パッキン等のシール材を
設けた前記端面板をシリンダ等により金型前記一体型厚
肉円筒端面に接触させた後、前記金型と前記一体型厚肉
円筒の密閉されたギャップに成形液、気体等を充満させ
、ポンプ等により設定圧力まで付加し、その圧力により
上・下金型を締付ける力より小さな力でしかも、成形領
域条件下で、軸力を優先的に付加、それに追従して成形
内圧を付加後、フィードバックで成形圧力、金型を締付
ける圧力をチェックし、圧力を途中設定圧力まで調整し
て、段階的に同動作を繰返し設定圧力まで付加して成形
完了後、成形内圧除去過程において、成形内圧を優先的
に除去し、その圧力に追従して軸力を除去し、フィード
バックで金型を締付ける圧力、成形圧力をチェックし段
階的に下げ、上・下金型の開き、変形を防止した高精度
なバルジ成形を特徴とする高精度バルジ成形制御方法。[Claims] 1. A mold that is divided to facilitate loading and unloading of workpieces and provided with a sealant on the divided surfaces, and a mold that is the same length as the mold and has an inner diameter larger than the outer diameter. A pressurizing rod provided to apply sealing force from both ends of the integrated thick-walled cylinder, and an end provided with an O-ring, packing, etc. to seal both end surfaces of the mold and the integrated thick-walled cylinder. In a bulge forming device consisting of a face plate, after setting the work, the lower mold was fixed and positioned using a cylinder etc. from the bottom of the integrated thick-walled cylinder, and after the upper mold was tightened, sealing material was attached from both ends to the tip. After bringing the pressure rod into contact with the workpiece and applying an axial force that counteracts the initial workpiece forming pressure, the end plate with sealing materials such as O-rings and packings from both ends is pressed into the mold by a cylinder or the like. After making contact with the end surface of the thick-walled cylinder, the sealed gap between the mold and the integrated thick-walled cylinder is filled with molding liquid, gas, etc., and the pressure is applied to a set pressure using a pump, etc., and the pressure causes the upper and lower molds to close together. Although the force is smaller than the force that tightens the mold, it preferentially applies axial force under the conditions of the molding area, and after adding molding internal pressure following it, checks the molding pressure and mold clamping pressure with feedback, and then adjusts the pressure. Adjust the pressure to the set pressure midway through the process, repeat the same action step by step until the set pressure is reached, and after completion of molding, in the molding internal pressure removal process, the molding internal pressure is preferentially removed, and the axial force is removed by following that pressure. This is a high-precision bulge forming control method that uses feedback to check the mold tightening pressure and molding pressure and lower them in stages to prevent the upper and lower molds from opening or deforming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61171617A JPS6330128A (en) | 1986-07-23 | 1986-07-23 | Control method for bulging with high accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61171617A JPS6330128A (en) | 1986-07-23 | 1986-07-23 | Control method for bulging with high accuracy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6330128A true JPS6330128A (en) | 1988-02-08 |
Family
ID=15926492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61171617A Pending JPS6330128A (en) | 1986-07-23 | 1986-07-23 | Control method for bulging with high accuracy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6330128A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5051082A (en) * | 1989-02-17 | 1991-09-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Apparatus for adjusting die lips for extrusion molding |
| JPH0739965A (en) * | 1990-02-02 | 1995-02-10 | Europa Metalli Lmi Spa | Production of hollow integral metal element |
-
1986
- 1986-07-23 JP JP61171617A patent/JPS6330128A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5051082A (en) * | 1989-02-17 | 1991-09-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Apparatus for adjusting die lips for extrusion molding |
| JPH0739965A (en) * | 1990-02-02 | 1995-02-10 | Europa Metalli Lmi Spa | Production of hollow integral metal element |
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