JPH0236345B2 - DAIKYASUTOSOCHI - Google Patents
DAIKYASUTOSOCHIInfo
- Publication number
- JPH0236345B2 JPH0236345B2 JP2394686A JP2394686A JPH0236345B2 JP H0236345 B2 JPH0236345 B2 JP H0236345B2 JP 2394686 A JP2394686 A JP 2394686A JP 2394686 A JP2394686 A JP 2394686A JP H0236345 B2 JPH0236345 B2 JP H0236345B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- plunger
- cylinder
- valve
- mold
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000004512 die casting Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
この発明は、ダイキヤスト法において宿命的な
欠点である鋳巣の発生をなくすための新規なダイ
キヤスト装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel die casting apparatus for eliminating the occurrence of blowholes, which is a fatal drawback in the die casting method.
鋳巣の発生を防止するために金型内を二次加圧
する方法が行なわれている。 In order to prevent the formation of blowholes, a method of applying secondary pressure to the inside of the mold is used.
この場合における二次加圧圧力は金型内の溶湯
が固化する以前に製品内部即ち鋳巣発生個所に伝
達されねばならないことは勿論であるが型内にお
いて、溶湯の固化する時点及び固化するまでの時
間は、材料及び製品の肉厚等によつて区々であ
る。 In this case, it goes without saying that the secondary pressurizing pressure must be transmitted to the inside of the product, that is, the area where the porosity occurs, before the molten metal in the mold solidifies. The time required varies depending on the material and thickness of the product.
従つて二次加圧の開始時点及び加圧時間が調節
可能であることが望ましいのである。 Therefore, it is desirable to be able to adjust the start point and pressurization time of the secondary pressurization.
然るに従来法においてはこれらのことが考慮さ
れていない上、二次加圧シリンダを、射出シリン
ダの射出圧力を圧力スイツチで検出した電気信号
によつて作動させていたから加圧遅れを生じて有
効な二次加圧が得られず、これを補うため必要以
上の圧力で加圧していた。 However, in the conventional method, these issues are not taken into consideration, and the secondary pressurizing cylinder is operated by an electric signal detected by a pressure switch that detects the injection pressure of the injection cylinder. Subsequent pressurization could not be obtained, and to compensate for this, pressurization was applied with more pressure than necessary.
更に、上記検知手段による信号では作動タイミ
ングが不安定で所望する作動開始時点を安定して
再現させることが困難であり、二次加圧の効果が
不充分であつた。 Furthermore, with the signal from the detection means, the operation timing is unstable and it is difficult to stably reproduce the desired start point of operation, and the effect of secondary pressurization is insufficient.
本発明は二次加圧用シリンダの作動開始時点を
再現性よく変更調節できると共に圧力印加状態を
も可変できるようにしたものであつて、製品の材
料、形状、肉厚等に応じた最適条件で二次加圧を
行ないうるダイキヤスト装置を提供するものであ
る。 The present invention makes it possible to change and adjust the starting point of operation of the secondary pressure cylinder with good reproducibility, and also to vary the pressure application state, so that it can be adjusted under optimal conditions according to the material, shape, wall thickness, etc. of the product. A die casting device capable of performing secondary pressurization is provided.
本発明装置は金型内に挿入されるプランジヤを
備えた二次加圧用シリンダが金型の一方に固設さ
れると共に射出シリンダ圧力の上昇を検知して作
動するシーケンスバルブと、このシーケンスバル
ブと二次加圧シリンダとの間に射出シリンダの作
動時に切換えられる切換弁と流量調節弁が介装さ
れ、シーケンスバルブの調整によつて二次加圧シ
リンダの作動タイミングを変更し、流量調節弁に
よつてプランジヤの進行速度を可変するものであ
る。 The device of the present invention includes a secondary pressurizing cylinder equipped with a plunger inserted into the mold, which is fixed to one side of the mold, and a sequence valve that is activated by detecting an increase in injection cylinder pressure. A switching valve and a flow rate control valve are interposed between the secondary pressurization cylinder and the flow rate control valve, which are switched when the injection cylinder is activated.By adjusting the sequence valve, the operation timing of the secondary pressurization cylinder is changed, and the flow rate control valve changes. Therefore, the advancing speed of the plunger can be varied.
これを図の実施例装置について説明する。 This will be explained with reference to the embodiment shown in the figure.
１は射出シリンダ、２はプランジヤ、３はスリ
ーブ、４は固定金型、５は可動金型、６はキヤビ
テイである。 1 is an injection cylinder, 2 is a plunger, 3 is a sleeve, 4 is a fixed mold, 5 is a movable mold, and 6 is a cavity.
７は、可部金型にステーボルト９によつて固設
された二次加圧用シリンダ、８はプランジヤであ
つて巣の発生し易い個所例えば肉厚部に対応位置
して設けられている。なお、図の装置は製品に中
心孔を有する場合であつて、プランジヤ８は中心
孔に位置して設けられている。 Reference numeral 7 denotes a secondary pressurizing cylinder fixed to the movable mold by a stay bolt 9, and 8 a plunger, which is provided at a position corresponding to a portion where cavities are likely to occur, such as a thick wall portion. Note that the device shown in the figure is a case in which the product has a center hole, and the plunger 8 is provided to be located in the center hole.
１０は押出ピン、１１は押出プレート、１２は
押出シリンダである。 10 is an extrusion pin, 11 is an extrusion plate, and 12 is an extrusion cylinder.
１３は、油圧源に接続されているシーケンスバ
ルブであつて、射出シリンダ１の供給側圧力をパ
イロツト圧１４として作動する。 Reference numeral 13 denotes a sequence valve connected to a hydraulic power source, which operates using the supply side pressure of the injection cylinder 1 as a pilot pressure 14.
１５は切換バルブ、１６は流量調節弁、１７
は、二次加圧シリンダの圧力ポートに接続する圧
力ライン、１８は戻りラインである。 15 is a switching valve, 16 is a flow rate control valve, 17
is a pressure line connected to the pressure port of the secondary pressurizing cylinder, and 18 is a return line.
上記装置において射出シリンダに圧油が供給さ
れてシリンダが加圧されると、切換弁１５が切換
えられて待機状態となる。 In the above device, when pressure oil is supplied to the injection cylinder and the cylinder is pressurized, the switching valve 15 is switched to a standby state.
キヤビテイ６内に湯が注入される。 Hot water is injected into the cavity 6.
この場合の射出シリンダ内圧力の変化は第２図
P1の如くであつてt1でシリンダ加圧が開始され、
t2においてキヤビテイ内に湯が充満する。更にプ
ランジヤ２が前進して加圧されt3以後ほぼ一定圧
力を維持する。なお、t1−t3までの時間は通常の
場合で約0.2秒である。 Figure 2 shows the change in the pressure inside the injection cylinder in this case.
As P 1 , cylinder pressurization starts at t 1 ,
At t 2 , the cavity is filled with hot water. Further, the plunger 2 moves forward and pressurizes, and maintains a substantially constant pressure after t3 . Note that the time from t 1 to t 3 is approximately 0.2 seconds in a normal case.
本発明においては溶湯金属がデンドライト組織
にある間に二次加圧圧力をその内部にまで与える
ものであつてt3−t5の期間（約0.5〜0.6秒）内の
二次加圧が開始され且つ終了する必要がある。 In the present invention, secondary pressurization pressure is applied to the inside of the molten metal while it is in the dendrite structure, and the secondary pressurization starts within the period t 3 - t 5 (approximately 0.5 to 0.6 seconds). must be completed and terminated.
図において二次加圧P2はt4で開始されt5で完了
している。 In the figure, secondary pressurization P 2 is started at t 4 and completed at t 5 .
而してこのような二次加圧の作動は、シーケン
スバルブ１３と流量調節弁１６によつて容易に調
整できるのである。 Therefore, the operation of such secondary pressurization can be easily adjusted by the sequence valve 13 and the flow control valve 16.
即ち、シーケンスバルブのパイロツト圧はt1で
検知され予め調節された設定時間t4において流路
が形成されて二次加圧シリンダ７の圧力ポートに
圧力ライン１７を経て圧油が供給されプランジヤ
８が型内に挿入される。 That is, the pilot pressure of the sequence valve is detected at t1 , and at a preset time t4 , a flow path is formed, and pressure oil is supplied to the pressure port of the secondary pressurizing cylinder 7 via the pressure line 17, and the plunger 8 is inserted into the type.
プランジヤの進行速度は流量調節弁１６の調節
によつて図の鎖線の如く自由に変更できるのであ
る。 The advancing speed of the plunger can be freely changed by adjusting the flow control valve 16 as shown by the chain line in the figure.
プランジヤ８が未だ凝固していない鋳型品に挿
入される際、プランジヤ先端面が平坦面である
と、その外周辺部において材料の流れが加速され
また局部的に起こる結果、製品組織にズレを生じ
させることがある。これを防ぐためプランジヤ先
端周辺にテーパー８ａが設けられている。 When the plunger 8 is inserted into a molded product that has not yet solidified, if the tip surface of the plunger is flat, the flow of material will be accelerated at the outer periphery and will occur locally, resulting in misalignment of the product structure. Sometimes I let it happen. To prevent this, a taper 8a is provided around the tip of the plunger.
プランジヤ８が所定位置に達し型内の材料に充
分な二次加圧を与えた後は加圧源の設定圧力によ
つて定まる所定圧力を維持する。 After the plunger 8 reaches a predetermined position and applies sufficient secondary pressure to the material in the mold, a predetermined pressure determined by the set pressure of the pressure source is maintained.
所定時間の後射出シリンダ１が後退し切換弁１
５が切換えられて加圧シリンダ７も後退し、可動
金型が開かれ、押出ピン１０によつて成型品が型
内から排出される。 After a predetermined time, the injection cylinder 1 moves back and the switching valve 1 closes.
5 is switched, the pressurizing cylinder 7 is also moved back, the movable mold is opened, and the molded product is ejected from the mold by the extrusion pin 10.
本発明装置によつて得られた製品は、二次加圧
を行なわない製品と比較して明らかに密度の増加
が認められ、機械的強度も増大している。 The product obtained by the apparatus of the present invention has a clearly increased density and mechanical strength compared to a product that is not subjected to secondary pressurization.
また顕微鏡観察によて組織の緻密化も確認され
ている。 Microscopic observation also confirmed that the tissue was becoming denser.
即ち実施例において、中心孔（軸孔）の周辺部
には巣の発生が認められないばかりか孔の周辺部
は他の部分に比して組織が緻密であつた。 That is, in the examples, not only no nests were observed around the central hole (axial hole), but also the tissue around the hole was denser than other parts.
以上の如く本発明において二次加圧開始時期を
定めるシーケンスバルブの調整と、必要とする二
次加圧圧力において加圧プランジヤの進行速度を
制御する流量調節弁の調整を、実験的に求めた最
良の条件に設定することによつて製品に二次加圧
効果を再現性よく有効に付与することができるの
である。 As described above, in the present invention, the adjustment of the sequence valve that determines the timing to start secondary pressurization and the adjustment of the flow rate control valve that controls the advancing speed of the pressurization plunger at the required secondary pressurization pressure were experimentally determined. By setting the best conditions, it is possible to effectively impart a secondary pressurizing effect to the product with good reproducibility.
第１図は本発明装置の概要構成図、第２図は射
出シリンダ圧力と二次加圧圧力との関係を示すグ
ラフ、第３図はプランジヤ先端部の側面図であ
る。
５……可動金型、７……二次加圧用シリンダ、
８……プランジヤ。
FIG. 1 is a schematic configuration diagram of the apparatus of the present invention, FIG. 2 is a graph showing the relationship between injection cylinder pressure and secondary pressurizing pressure, and FIG. 3 is a side view of the plunger tip. 5...Movable mold, 7...Secondary pressure cylinder,
8... Plungiya.
Claims (1)
加圧シリンダが金型の一方に固設されると共に射
出シリンダ圧力の上昇を検知して作動し所定の油
圧源に接続されたシーケンスバルブと、該シーケ
ンスバルブと前記二次加圧シリンダとの間に流量
調節弁が介装され、前記シーケンスバルブの調整
によつて前記二次加圧シリンダの作動開始時点を
変更し、前記流量調節弁によつてプランジヤの進
行速度を可変することを特徴とするダイキヤスト
装置。 ２ シーケンスバルブと二次加圧シリンダとの間
に、切換弁が設けられてなる特許請求の範囲第１
項記載の装置。 ３ プランジヤの先端にテーパー面が形成されて
なる特許請求の範囲第１項記載の装置。[Claims] 1. A secondary pressurizing cylinder equipped with a plunger inserted into the mold is fixed to one side of the mold, and is activated by detecting an increase in injection cylinder pressure to supply a predetermined hydraulic pressure source. A flow control valve is interposed between the connected sequence valve and the sequence valve and the secondary pressurizing cylinder, and the operation start point of the secondary pressurizing cylinder is changed by adjusting the sequence valve. , A die casting apparatus characterized in that the advancing speed of the plunger is varied by the flow rate control valve. 2. Claim 1, wherein a switching valve is provided between the sequence valve and the secondary pressurizing cylinder.
Apparatus described in section. 3. The device according to claim 1, wherein a tapered surface is formed at the tip of the plunger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2394686A JPH0236345B2 (en) | 1986-02-07 | 1986-02-07 | DAIKYASUTOSOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2394686A JPH0236345B2 (en) | 1986-02-07 | 1986-02-07 | DAIKYASUTOSOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62183954A JPS62183954A (en) | 1987-08-12 |
| JPH0236345B2 true JPH0236345B2 (en) | 1990-08-16 |
Family
ID=12124708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2394686A Expired - Lifetime JPH0236345B2 (en) | 1986-02-07 | 1986-02-07 | DAIKYASUTOSOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0236345B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0730203Y2 (en) * | 1987-02-26 | 1995-07-12 | 本田技研工業株式会社 | Die casting equipment |
| JP2731557B2 (en) * | 1988-11-22 | 1998-03-25 | 東芝機械株式会社 | Squeeze plunger operation method in die casting machine |
| JPH02182364A (en) * | 1988-12-30 | 1990-07-17 | Kobe Steel Ltd | High pressure casting method for casting |
| JP7591969B2 (en) * | 2021-04-30 | 2024-11-29 | リョービ株式会社 | Die casting equipment and die casting method |
-
1986
- 1986-02-07 JP JP2394686A patent/JPH0236345B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62183954A (en) | 1987-08-12 |
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