JPH02217402A - Sintering die - Google Patents
Sintering dieInfo
- Publication number
- JPH02217402A JPH02217402A JP3953689A JP3953689A JPH02217402A JP H02217402 A JPH02217402 A JP H02217402A JP 3953689 A JP3953689 A JP 3953689A JP 3953689 A JP3953689 A JP 3953689A JP H02217402 A JPH02217402 A JP H02217402A
- Authority
- JP
- Japan
- Prior art keywords
- sintering
- die
- cavity
- annular
- pressure
- 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
- 238000005245 sintering Methods 0.000 title claims abstract description 55
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 244000171726 Scotch broom Species 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は金型内のキャビティーに焼結用金属粉末を供給
した上で、キャビティー内の焼結用金属粉末をパンチに
より加圧して焼結用成形体を形成する焼結金型に関する
。Detailed Description of the Invention (Industrial Application Field) The present invention involves supplying sintering metal powder to a cavity in a mold, and then pressurizing the sintering metal powder in the cavity with a punch. The present invention relates to a sintering mold for forming a sintering molded body.
（従来の技術）
焼結用金属粉末を金型本体内のキャビティーに供給し、
同粉末をパンチにより圧粉して焼結用成形体を形成し、
その焼結用成形体を焼結炉内で加熱し、焼結体を形成す
ることが行なわれている。(Conventional technology) Metal powder for sintering is supplied to a cavity in the mold body,
The same powder is compacted with a punch to form a compact for sintering,
The molded body for sintering is heated in a sintering furnace to form a sintered body.
このような焼結による製造方法では、焼結用成形体を生
成するための焼結金型を作成し、しかも。In such a manufacturing method using sintering, a sintering mold is created to produce a sintered compact.
得られた焼結用成形体を焼結するための焼結炉をも必要
とする。しかし、この方法はその他の製造方法、例えば
切削加工法、鋳造法、その他の方法と比較して、加工工
程の簡素化により加工時間の短縮化を図れ、しかも、各
作業者の加工技術を多く必要とせず、大量生産に適し、
コストダウンを図り易く、多用されている。A sintering furnace is also required for sintering the obtained compact for sintering. However, compared to other manufacturing methods such as cutting methods, casting methods, and other methods, this method simplifies the processing process and reduces processing time. Suitable for mass production without the need for
It is easy to reduce costs and is widely used.
（発明が解決しようとする課題）
ところで、焼結金型により焼結用成形体を製造する場合
、その焼結金型であるダイス内のキャビティーに供給さ
れた焼結用金属粉末は、パンチにより圧粉処理され、こ
れにより生成された焼結用成形体は、キャビティーより
適宜の押出し手段により突き出される。(Problem to be Solved by the Invention) By the way, when producing a sintering molded body using a sintering mold, the sintering metal powder supplied to the cavity in the die, which is the sintering mold, is The molded body for sintering thus produced is ejected from the cavity by an appropriate extrusion means.
ところが、このダイスより抜き出される焼結用成形体は
、特に、その抜き出し方向と平行な外周側壁がこれと対
向するキャビティー形成域及びこれに続くダイス内側壁
と強く摩擦しながら抜き出される。However, the sintered compact is extracted from the die while the outer peripheral side wall parallel to the extraction direction strongly rubs against the opposing cavity forming area and the adjacent inner wall of the die.
このため、ダイスより抜は呂る際に、焼結用成形体の外
周側壁にはダイス内側壁側より受けていた圧縮荷重が急
激に開放され、応力が急変する部分が一時的に生じる。Therefore, when the sintering compact is removed from the die, the compressive load that had been received from the inner wall of the die is suddenly released on the outer peripheral side wall of the sintering compact, and a portion where the stress suddenly changes is temporarily created.
この結果、焼結用成形体の外周側壁の一部、特に、エッ
チ部分にクラックが発生するおそれがあり、問題と成っ
ている。As a result, cracks may occur in a portion of the outer peripheral side wall of the sintering molded body, particularly in the etched portion, which poses a problem.
本発明の目的は、焼結用成形体の生成時に、クランクの
発生を防止できる焼結金型を提供することにある。An object of the present invention is to provide a sintering mold that can prevent cranking during production of a sintered compact.
（課題を解決するための手段）
上述の目的を達成するために、本発明による焼結金型は
、金型本体にその外表面に開口する凹部を形成し、その
凹部に突入退却可能なパンチにより上記凹部内のキャビ
ティー形成域の焼結用金属粉末を加圧して焼結用成形体
を形成するものであって、上記金型本体には上記キャビ
ティー形成域の周囲で上記パンチと干渉しない領域に環
状の油圧室が形成された環状ダイスを組込装着し、上記
環状ダイスには上記キャビティー形成域の環状側縁と対
向すると共に上記キャビティー形成域に向けて進退作動
可能な可変壁部が形成されたことを特徴とする。(Means for Solving the Problems) In order to achieve the above-mentioned object, the sintering mold according to the present invention has a mold body formed with a recess that opens on the outer surface thereof, and a punch that can enter and retreat into the recess. The mold body presses the sintering metal powder in the cavity forming area in the recess to form a sintering compact, and the mold body has a part that interferes with the punch around the cavity forming area. An annular die having an annular hydraulic chamber formed in a non-contact area is installed, and the annular die has a variable die that faces the annular side edge of the cavity forming area and can move forward and backward toward the cavity forming area. It is characterized by a wall portion.
（作 用）
環状ダイスの可変壁部がキャビティー形成域に向けて進
退作動可能なように構成さているため、この可変壁部を
キャビティー形成域より後退作動させた上で焼結用成形
体を抜き出せば、その外周側壁の応力の急変部分を排除
出来る。(Function) Since the variable wall portion of the annular die is configured to be able to move forward and backward toward the cavity forming region, the variable wall portion is moved backward from the cavity forming region and then the molded body for sintering is carried out. By extracting this, the sudden change in stress on the outer peripheral side wall can be eliminated.
（実 施 例） 第１図には本発明の実施例としての焼結金型を示した。(Example) FIG. 1 shows a sintering mold as an embodiment of the present invention.
この焼結金型は図示しない基台に支持される金型本体１
、環状ダイス２．パンチ用アクチュエータ７により上下
に移動操作されるアッパパンチ３、金型本体１に支持さ
れるロアパンチ４、環状ダイス２内の環状の油圧室５に
接続される高圧油供給手段６及び制御手段としてのコン
トローラ８とでその要部が構成されており、被焼結体と
してのギアを焼結処理するまえの焼結用成形体を生成す
るのに用いられる。This sintering mold has a mold body 1 supported on a base (not shown).
, circular die 2. An upper punch 3 that is moved up and down by a punch actuator 7, a lower punch 4 supported by the mold body 1, a high-pressure oil supply means 6 connected to an annular hydraulic chamber 5 in an annular die 2, and a controller as a control means. 8 constitutes the main part thereof, and is used to produce a compact for sintering before sintering a gear as a sintered body.
金型本体１はその中央部分に縦穴９を形成され、その穴
の下部域にはロアパンチ４が固定状態で、密に嵌着され
ている。このロアパンチ４の中央には密に中実軸１０が
嵌挿固定され、これはロアパンチ４の上面１１より所定
量突出し、特にその先端にはアッパバンチ３が勘合する
。A vertical hole 9 is formed in the center of the mold body 1, and a lower punch 4 is fixedly and tightly fitted into the lower region of the hole. A solid shaft 10 is tightly fitted and fixed in the center of the lower punch 4, and projects a predetermined amount from the upper surface 11 of the lower punch 4, and the upper bunch 3 is fitted particularly at its tip.
上面１１より上側の縦穴９の部分はキャビティー形成域
Ａをなすもので、更に、その上側より開口端までの上穴
部分にアッパパンチ３が突入退却可能に嵌合する。The portion of the vertical hole 9 above the upper surface 11 forms a cavity forming area A, and furthermore, the upper punch 3 fits into the upper hole portion from the upper side to the opening end so as to be able to enter and retreat.
パンチ用アクチュエータ７はその出力端にアッパバンチ
３を取付ており、加圧手段を操作する駆動回路１２の出
力に応じてアッパパンチ３を上下動させ、その先端を縦
穴９に突入、退却させ、且つ、キャビティー形成域Ａの
焼結用金属粉末に加圧力を加える。なお、パンチ用アク
チュエータ７はその加圧力を第５図に示すように、経時
的に増加出来るように、コントローラ８により加圧制御
される。The punch actuator 7 has an upper punch 3 attached to its output end, and moves the upper punch 3 up and down in accordance with the output of the drive circuit 12 that operates the pressurizing means, so that its tip enters and retreats into the vertical hole 9, and Pressure is applied to the metal powder for sintering in the cavity forming area A. The punching actuator 7 is pressurized by a controller 8 so that its pressurizing force can be increased over time as shown in FIG.
環状ダイス２はその内部に環状の油圧室５を形成され、
同油圧室５は高圧油供給手段６の増圧器１４に接続され
ている。The annular die 2 has an annular hydraulic chamber 5 formed therein,
The hydraulic chamber 5 is connected to a pressure intensifier 14 of a high-pressure oil supply means 6.
更に、環状ダイス２はその内周側に可変壁部１３を形成
されている。この可変壁部１３の内周面は被焼結体とし
てのギアの歯形の雌型を成すように形成され、キャビテ
ィー形成域Ａと対向している。Further, the annular die 2 has a variable wall portion 13 formed on its inner circumferential side. The inner circumferential surface of the variable wall portion 13 is formed to form a female tooth shape of a gear as a sintered body, and faces the cavity forming area A.
しかも、第４図に示すように、同可変壁部１３は上記キ
ャビティー形成域に向けて弾性的に所定量ａだけ進退作
動可能な厚さＴに形成されている。即ち、この可変壁部
１３は油圧室５の油圧の増減に応じてキャビティー形成
域Ａ方向への進退作動量を増減させることが出来るよう
に構成されている。Furthermore, as shown in FIG. 4, the variable wall portion 13 is formed to have a thickness T that allows it to be elastically moved forward and backward by a predetermined amount a toward the cavity forming area. That is, the variable wall portion 13 is configured to be able to increase or decrease the amount of movement toward the cavity forming area A in response to an increase or decrease in the oil pressure in the hydraulic chamber 5.
アッパパンチ３とロアパンチ４はそれらの上面１１、下
面１５をキャビティー形成域Ａにおいて対向させた際、
ｗｉＪ者が中実軸１０に嵌合することにより、両者の相
対位置決めを行なうように構成されている。When the upper punch 3 and the lower punch 4 have their upper surfaces 11 and lower surfaces 15 facing each other in the cavity forming area A,
By fitting the user into the solid shaft 10, the relative positioning of the two is performed.
更に、アッパパンチ３とロアバンチ４の面外周壁の内、
互いの対向部分には環状ダイス２の可変壁部１３の内周
面に摺接可能な形状、即ち、被焼結体としてのギアの歯
形と同一の歯形が形成されている。Furthermore, among the outer peripheral walls of the upper punch 3 and the lower bunch 4,
The mutually opposing portions are formed in a shape that can slide into sliding contact with the inner circumferential surface of the variable wall portion 13 of the annular die 2, that is, a tooth profile that is the same as the tooth profile of the gear serving as the object to be sintered.
なお、第１＠中、符号１６は油圧シリンダを示しており
、これらにより各突き出しピン１７を突出作動させて、
キャビティーＡより焼結用成形体１８を離型させること
が出来る。In addition, in the first @, the reference numeral 16 indicates a hydraulic cylinder, and each ejecting pin 17 is operated to eject by these cylinders.
The molded body 18 for sintering can be released from the cavity A.
高圧油供給手段６は環状の油圧室５に接続された増圧器
１４と、増圧器１４に切り換え弁１８を介して接続され
たベーンポンプ１９と、ベーンポンプＩ９を駆動するモ
ータ２０及びオイルタンク２１とで構成されている。こ
こで、切り換え弁２６は弁駆動回Ｉ４２２を介して、ベ
ーンポンプ１９の容量可変手段２３の７クチユエータは
圧力調整駆動回路２４を介して、モータ２０はモータ駆
動回Ｎ２５を介してそれぞれコントローラ８に接続され
ている。The high pressure oil supply means 6 includes a pressure intensifier 14 connected to the annular hydraulic chamber 5, a vane pump 19 connected to the pressure intensifier 14 via a switching valve 18, a motor 20 for driving the vane pump I9, and an oil tank 21. It is configured. Here, the switching valve 26 is connected to the controller 8 via a valve drive circuit I422, the seven cutout units of the capacity variable means 23 of the vane pump 19 are connected to the pressure adjustment drive circuit 24, and the motor 20 is connected to the controller 8 via a motor drive circuit N25. has been done.
増圧器１４はポンプ１９からの圧油を受けてこれを受圧
面積の異なる一対の大小ピストンを用・いて増圧する周
知の手段である。切り換え弁２６はオフ時に増圧器１４
の油圧室１４１をオイルタンク２１に開放し、オン時に
油圧室１４１をベーンポンプ１９の吐出路に連通させる
ように切り換え作動する。ベーンポンプ１９はオイルタ
ンク２１の油を加圧して吐出出来るもので、特にその吐
出口は容量可変手段としての圧力調整器２３を介して切
り換え弁２６側に連通さている。ここで、圧力調整器２
３は吐出圧が設定圧を超えると吐出油の一部を吸入路側
に戻すよう、内臓されるスプール弁とばねとが共働する
周知の構成を取るもので、その設定圧調整用の図示しな
いアクチュエータが圧力調整駆動回路２４により駆動さ
れるものである。The pressure intensifier 14 is a well-known means for receiving pressure oil from the pump 19 and increasing the pressure by using a pair of large and small pistons having different pressure receiving areas. When the switching valve 26 is off, the pressure intensifier 14
The hydraulic chamber 141 of the vane pump 19 is opened to the oil tank 21, and the hydraulic chamber 141 is switched to communicate with the discharge path of the vane pump 19 when turned on. The vane pump 19 is capable of pressurizing and discharging the oil in the oil tank 21, and in particular, its discharge port is communicated with the switching valve 26 via a pressure regulator 23 as a capacity variable means. Here, pressure regulator 2
3 has a well-known configuration in which a built-in spool valve and a spring work together to return a part of the discharged oil to the suction passage side when the discharge pressure exceeds the set pressure, and there is a function (not shown) for adjusting the set pressure. The actuator is driven by a pressure adjustment drive circuit 24.
コントローラ８はマイクロコンピュータから成り、焼結
金型の全体を制御する。The controller 8 consists of a microcomputer and controls the entire sintering mold.
このコントローラ８の入力端にはアッパパンチ３が退却
位置にあると出力する第１スイツチ２９、アッパパンチ
３が加圧位置にあると出力する第２スイツチ３０、油圧
室１４１の油圧情報を出力する油圧センサ３１、メイン
スイッチ２７、指令スイッチ２８がそれぞれ接続されて
いる。At the input end of this controller 8, there is a first switch 29 that outputs an output when the upper punch 3 is in the retreat position, a second switch 30 that outputs an output when the upper punch 3 is in the pressurized position, and an oil pressure sensor that outputs oil pressure information of the oil pressure chamber 141. 31, a main switch 27, and a command switch 28 are connected, respectively.
ここで、コントローラ８のＲＯＭには第６＠に示すよう
な制御プログラムが書き込まれており、以下の制御を実
行する。Here, a control program as shown in No. 6@ is written in the ROM of the controller 8, and the following control is executed.
即ち、本装置のメインスイッチ２７がオンされると、コ
ントローラ８はベーンポンプ２０を駆動させ、アッパパ
ンチ３が退却位置に有るかを確認し、切り換え弁２６の
オフを確認し、加圧の指令を待つ。That is, when the main switch 27 of this device is turned on, the controller 8 drives the vane pump 20, checks whether the upper punch 3 is in the retreat position, checks that the switching valve 26 is turned off, and waits for a pressurization command. .
この間に、キャビティーＡに焼結用金属粉末を適宜の手
段により供給する。During this time, the metal powder for sintering is supplied to the cavity A by an appropriate means.
この後、指令スイッチ２８がオンされると、ステップａ
４に進む。ここでは後退位置のアッパパンチ３を開動さ
せ、その先端を縦穴９に突入させる作動に入る。続いて
、切り換え弁２６がオンされ、ポンプの油圧が供給され
始める。そして、第２スイツチよりオン出力が入力され
るのを待ち、オンされたのが確認されると、コントロー
ラ８はキャビティー形成域Ａの焼結用金属粉末に加圧力
を加える制御に入る。このような処理において、コント
ローラはパンチ用アクチュエータフの加圧パターンを第
５図に示すように経時的に除々に増加させる。After this, when the command switch 28 is turned on, step a
Proceed to step 4. Here, the upper punch 3 in the retracted position is opened and the tip thereof enters the vertical hole 9. Subsequently, the switching valve 26 is turned on and oil pressure to the pump begins to be supplied. Then, it waits for the ON output to be input from the second switch, and when it is confirmed that it has been turned ON, the controller 8 enters control to apply pressure to the sintering metal powder in the cavity forming area A. In such processing, the controller gradually increases the pressure pattern of the punch actuator tough over time as shown in FIG.
更に、コントローラは油圧センサ３１の出力に応じて、
圧力調整器２３を第３図に示す経時パターンに沿って操
作し、ポンプの吐出圧を調整して、油圧室１４１の油圧
を経時的に変化させるべく制御する。Furthermore, the controller, depending on the output of the oil pressure sensor 31,
The pressure regulator 23 is operated according to the temporal pattern shown in FIG. 3 to adjust the discharge pressure of the pump and control the hydraulic pressure in the hydraulic chamber 141 to change over time.
即ち、第３図に示すように、焼結用金属粉末が圧粉され
る初期圧紛域ａではほぼパンチ加圧値と油圧室１４１の
油圧値とが等しくなるよう制御し、Ｔ１点に達した後は
圧力調整器２３を操作し、更に油圧室１４１の油圧値の
増加比率を大きくする。続いて、可変壁部１３の厚さＴ
の方向であるキャビティーＡの内径を狭める方向に加圧
力を増加させ、最大圧Ｐ１に達したのを検知すると（ス
テップａ８）。That is, as shown in FIG. 3, in the initial compaction area a where the metal powder for sintering is compacted, the punch pressure value and the hydraulic pressure value of the hydraulic chamber 141 are controlled to be approximately equal, and the pressure reaches the T1 point. After that, the pressure regulator 23 is operated to further increase the rate of increase in the oil pressure value of the oil pressure chamber 141. Next, the thickness T of the variable wall portion 13
The pressurizing force is increased in the direction of narrowing the inner diameter of the cavity A, and when it is detected that the maximum pressure P1 has been reached (step a8).
その後、所定時間ｔ１の経過を待つ（ステップａ９）。Thereafter, the process waits for a predetermined time t1 to elapse (step a9).
その後、パンチ用アクチュエータ７の油圧を所定の解除
パターンにより減圧処理する（ステップａ１０）、この
際、油圧室１４１の油圧がパンチ用アクチュエータフの
油圧とほぼ釣り合うように１例えば。Thereafter, the hydraulic pressure of the punching actuator 7 is reduced according to a predetermined release pattern (step a10). At this time, for example, the hydraulic pressure of the hydraulic chamber 141 is adjusted to approximately balance the hydraulic pressure of the punching actuator 7.
第３図の符号Ｃで示す減圧領域での減圧処理をする。こ
れに続いて、ステップａｌｏではパンチ用アクチュエー
タ７を上昇作動させてアッパパンチ３を退却位置に戻す
。A depressurization process is carried out in the depressurized region indicated by the symbol C in FIG. Subsequently, in step alo, the punch actuator 7 is operated upward to return the upper punch 3 to the retreated position.
そして、ステップａｌｌでは第１スイツチ２９のオン信
号を待ち、オンでは油圧シリンダ１６を駆動させ、これ
により、各突き出しピン１７を突出作動させて、キャビ
ティーＡより焼結用成形体１８を離型させる。Then, in step all, the first switch 29 waits for an ON signal, and when it is ON, the hydraulic cylinder 16 is driven, which causes each ejector pin 17 to project and release the sintering compact 18 from the cavity A. let
この時、キャビティーＡの外周の可変壁部１３はキャビ
ティーの中央側より後退しく第４図の符号ａ参照）、キ
ャビティーの内径は拡大しており。At this time, the variable wall portion 13 on the outer periphery of the cavity A is set back from the center side of the cavity (see reference numeral a in FIG. 4), and the inner diameter of the cavity is expanded.
焼結用成形体１８の側壁と可変壁部１３との相対的なず
れが生じる時の摩擦力は極めて小さく成る。しかも、焼
結用成形体１８が可変壁部１３の上方に抜は出る際に生
じる応力急変部分では大きな応力急変がなく、この結果
、焼結用成形体１８の外周側壁の一部、特に、エッチ部
分のクラックの発生を防止出来る。When a relative displacement occurs between the side wall of the sintering compact 18 and the variable wall portion 13, the frictional force becomes extremely small. In addition, there is no large sudden change in stress in the part where the stress suddenly changes when the sintering molded body 18 is pulled out above the variable wall portion 13, and as a result, a part of the outer peripheral side wall of the sintering molded body 18, in particular, This can prevent cracks from forming in the etched areas.
この後、所定時間ｔ２の経過の後、各突き出しピン１７
を後退降下させ、更に、所定時間ｔ３の経過の後、制御
を終わる。After that, after the elapse of a predetermined time t2, each ejector pin 17
is moved backward and lowered, and furthermore, after the elapse of a predetermined time t3, the control is terminated.
（発明の効果）
以上のように本発明は、焼結用成形体をダイスより抜は
出す時の、摩擦力を低減出来、焼結用成形体の外周側壁
の一部、特に、エッチ部分にクラックが発生することを
確実に防止できる。(Effects of the Invention) As described above, the present invention can reduce the frictional force when pulling out the sintering molded body from the die, and can reduce the frictional force on a part of the outer peripheral side wall of the sintering molded body, especially in the etched part. It is possible to reliably prevent the occurrence of cracks.
第１図は本発明の一実施例としての焼結金型の全体構成
断面図、第２図は第１図のｎ−ｎ線断面図、第３図は第
１図中の油圧室の油圧制御パターンの一例としての特性
線図、第４図は第１図中の可変壁部の作用説明図、第５
図は第１図の焼結金型のパンチ用アクチュエータが駆動
するアッパパンチの制御特性図、第６図は第１図の焼結
金型のコントローラが行なう制御プログラムのフローチ
ャートである。
１・・金型本体・、２・・・環状ダイス、３・・・アッ
パパンチ、５・・・油圧室、９・・・縦穴、１３・・・
可変壁部、１８・・・焼結用成形体、Ａ・・・キャビテ
ィー％２ ■
墨３ ■
箒４Fig. 1 is a sectional view of the overall configuration of a sintering mold as an embodiment of the present invention, Fig. 2 is a sectional view taken along line nn in Fig. 1, and Fig. 3 is a hydraulic pressure of the hydraulic chamber in Fig. 1. A characteristic diagram as an example of a control pattern, FIG. 4 is an explanatory diagram of the action of the variable wall portion in FIG. 1, and FIG.
This figure is a control characteristic diagram of the upper punch driven by the punch actuator of the sintering die shown in FIG. 1, and FIG. 6 is a flowchart of a control program executed by the controller of the sintering die shown in FIG. 1. 1... Mold body, 2... Annular die, 3... Upper punch, 5... Hydraulic chamber, 9... Vertical hole, 13...
Variable wall part, 18... Molded body for sintering, A... Cavity %2 ■ Ink 3 ■ Broom 4
Claims (1)
部に突入退却可能なパンチにより上記凹部内のキャビテ
ィー形成域の焼結用金属粉末を加圧して焼結用成形体を
形成する焼結金型において、上記金型本体には上記キャ
ビティー形成域の周囲で上記パンチと干渉しない領域に
環状の油圧室が形成された環状ダイスを組込装着し、上
記環状ダイスには上記キャビティー形成域の環状側縁と
対向すると共に上記キャビティー形成域に向けて進退作
動可能な可変壁部が形成されたことを特徴とする焼結金
型。A recess opening on the outer surface of the mold body is formed, and a punch that can enter and retreat into the recess presses the sintering metal powder in the cavity forming area within the recess to form a sintering compact. In the sintering mold, an annular die in which an annular hydraulic chamber is formed in an area that does not interfere with the punch around the cavity forming area is installed in the die body, and the annular die has an annular hydraulic chamber formed in an area that does not interfere with the punch. A sintering mold characterized in that a variable wall portion is formed that faces the annular side edge of the tee forming area and can move forward and backward toward the cavity forming area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3953689A JPH02217402A (en) | 1989-02-20 | 1989-02-20 | Sintering die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3953689A JPH02217402A (en) | 1989-02-20 | 1989-02-20 | Sintering die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02217402A true JPH02217402A (en) | 1990-08-30 |
Family
ID=12555773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3953689A Pending JPH02217402A (en) | 1989-02-20 | 1989-02-20 | Sintering die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02217402A (en) |
-
1989
- 1989-02-20 JP JP3953689A patent/JPH02217402A/en active Pending
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