JPH05185483A - Controlling method for two-stage mold protection in injection molding machine - Google Patents
Controlling method for two-stage mold protection in injection molding machineInfo
- Publication number
- JPH05185483A JPH05185483A JP2323292A JP2323292A JPH05185483A JP H05185483 A JPH05185483 A JP H05185483A JP 2323292 A JP2323292 A JP 2323292A JP 2323292 A JP2323292 A JP 2323292A JP H05185483 A JPH05185483 A JP H05185483A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- speed
- movable
- spring
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/84—Safety devices
- B29C45/844—Preventing damage caused by obstructions or foreign matter caught between mould halves during mould closing, e.g. moulded parts or runners
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形機の型閉じ行
程中における金型保護制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold protection control method during a mold closing process of an injection molding machine.
【０００２】[0002]
【従来の技術】従来、射出成形機の型閉じ行程中におけ
る金型保護制御方法としては、次に説明する方法があ
る。2. Description of the Related Art Conventionally, as a mold protection control method during a mold closing process of an injection molding machine, there is a method described below.
【０００３】射出成形金型は、固定型と可動型からな
り、これら固定型および可動型は複数の型プレ−トが組
合わされて構成されている。そして金型保護制御方法と
しては、型閉じ行程中において、型締装置の可動盤ある
いは可動盤と連動する部材の位置を位置センサにより検
出し、可動盤のストロ−クまたは固定型と可動型のパ−
ティング面間の距離を求める。そして予め、固定型と可
動型とのタッチ位置直前のストロ−クに金型保護位置を
定めておき、この金型保護位置に可動盤が来たとき極低
速・低圧に切替えるものである。The injection mold comprises a fixed mold and a movable mold, and these fixed mold and movable mold are constructed by combining a plurality of mold plates. As a mold protection control method, during the mold closing process, the position of the movable plate of the mold clamping device or a member interlocking with the movable plate is detected by a position sensor, and the stroke of the movable plate or the fixed mold and the movable mold are detected. Par
Find the distance between the ting surfaces. Then, the mold protection position is set in advance on the stroke immediately before the touch position between the fixed mold and the movable mold, and when the movable plate comes to this mold protection position, it is switched to extremely low speed and low pressure.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の技術では、
型閉じ行程中において、金型内のスプリングの弾発力に
打ち勝つだけの大きさの型締力（以下、「最小型締力」
という。）が必要であり、前記最小型締力を超えて型締
力を小さくすることができない。その結果、パ−ティン
グ面間に異物が挟まっている場合、無理矢理型閉じして
しまい金型のパ−ティング面を損傷するおそれがあると
いう問題点がある。SUMMARY OF THE INVENTION In the above conventional technique,
During the mold closing process, the mold clamping force is large enough to overcome the elastic force of the spring in the mold (hereinafter referred to as "minimum mold clamping force").
Say. ) Is required and the mold clamping force cannot be reduced beyond the minimum mold clamping force. As a result, there is a problem that if a foreign matter is caught between the parting surfaces, the mold may be forcedly closed and the parting surface of the die may be damaged.
【０００５】本発明は、上記従来の技術の有する問題点
に鑑みてなされたものであり、金型内のスプリングの弾
発力に影響されずにパ−ティング面間に挟まれた異物を
検知して金型のパ−ティング面の損傷を防止することが
できる射出成形機における金型保護制御方法を実現する
ことを目的とするものである。The present invention has been made in view of the above problems of the prior art, and detects a foreign substance sandwiched between the parting surfaces without being affected by the elastic force of the spring in the mold. Thus, it is an object of the present invention to realize a mold protection control method in an injection molding machine that can prevent damage to the molding surface of the mold.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明の射出成形機における金型保護制御方法は、
固定型と可動型との間に少くとも１つの中間プレ−トを
有し、前記固定型および可動型のいずれか一方の型と前
記中間プレ−トとの間にスプリングを介在させた金型を
取付けた型締装置の型閉じ方法において、前記可動盤を
移動させるための移動速度および圧力を、高速・高圧か
ら低速・低圧にスロ−ダウンしたのち、極低速・低圧の
金型保護行程に切替えて型閉じを行う金型保護制御方法
であって、前記金型保護行程中における前記可動盤を移
動させるための移動速度および圧力を、前記中間プレ−
トと一方の型とが接触する前は前記スプリングの弾発力
よりも小さい力の極低速・低圧とし、前記中間プレ−ト
と一方の型とが接触した後は、前記スプリングの弾発力
よりも大きい力の極低速・低圧に切替えることを特徴と
するものである。In order to achieve the above object, a mold protection control method for an injection molding machine according to the present invention comprises:
A mold having at least one intermediate plate between the fixed mold and the movable mold, and a spring interposed between the mold and one of the fixed mold and the movable mold. In the mold closing method of the mold clamping device with the attached, the moving speed and pressure for moving the movable plate is slowed down from high speed / high pressure to low speed / low pressure, and then a very low speed / low pressure mold protection process is performed. A mold protection control method for switching and closing a mold, wherein the moving speed and pressure for moving the movable plate during the mold protection stroke are set to the intermediate pre-
Before contact between the mold and one of the molds, the elastic force of the spring is set to an extremely low speed and low pressure, and after the contact between the intermediate plate and the one mold, the elastic force of the spring. It is characterized by switching to extremely low speed and low pressure with a larger force.
【０００７】また、可動盤を移動させるための移動速度
および圧力を可変とするとよい。Further, the moving speed and pressure for moving the movable plate may be variable.
【０００８】[0008]
【作用】金型保護行程中における可動盤を移動させるた
めの圧力および移動速度は、可動型と中間プレ−トとが
接触する前はスプリングの弾発力よりも小さい力の極低
速・低圧であるため、可動型と中間プレ−トとの間に異
物が挟まれたときには可動盤は停止してパ−ティング面
を保護し、異物が存在しない場合には移動を続けて前記
中間プレ−トと接触する。そののちは、スプリングの弾
発力よりも大きい力の極低速・低圧に切替えられるの
で、可動盤は停止することなく型閉じされる。中間プレ
−トと固定型との間に異物が挟まれたときには可動盤は
停止し、スプリング面が保護される。[Function] The pressure and the moving speed for moving the movable platen during the mold protection process are at an extremely low speed and low pressure, which is smaller than the elastic force of the spring before the movable platen and the intermediate plate come into contact with each other. Therefore, when a foreign matter is sandwiched between the movable die and the intermediate plate, the movable platen stops to protect the parting surface, and when there is no foreign matter, the movable plate continues to move and the intermediate plate is moved. Contact with. After that, the movable platen is closed without stopping because the force is switched to extremely low speed and low pressure, which is larger than the elastic force of the spring. When a foreign object is sandwiched between the intermediate plate and the fixed die, the movable platen stops and the spring surface is protected.
【０００９】[0009]
【実施例】本発明の実施例を図面に基いて説明する。Embodiments of the present invention will be described with reference to the drawings.
【００１０】本発明の実施に使用する型締装置は、公知
の型締装置と同様のものでよいので、その説明は省略
し、本発明の実施に深く関係する部分について説明す
る。The mold clamping device used in the practice of the present invention may be the same as a known mold clamping device, so the description thereof will be omitted and only the part closely related to the practice of the present invention will be described.
【００１１】図１は型開きしたのち成形品を突出した状
態を示す部分断面図である。FIG. 1 is a partial sectional view showing a state where a molded product is projected after the mold is opened.
【００１２】型締装置の固定盤９には、可動盤１０に向
かって突出する固定側支持棒９ａが突設されており、該
固定側支持棒９ａには、可動盤側から順に第１位置検出
器１２、第２位置検出器１３および金型タッチ点位置検
出器１４が、その軸方向の位置が調整自在に配設されて
いる。他方、型締装置の可動盤１０には、固定側支持棒
９ａと平行に固定盤９に向かって突出する可動側支持棒
１０ａが突設されており、該可動側支持棒１０ａには、
カム１１がその軸方向の位置が調整自在に配設されてい
る。前記第２位置検出器１３の位置は可動型６と中間プ
レート５とが接触する位置と合致させる。The fixed platen 9 of the mold clamping device is provided with a fixed side support rod 9a protruding toward the movable platen 10. The fixed side support bar 9a has a first position in order from the movable platen side. The detector 12, the second position detector 13, and the die touch point position detector 14 are arranged such that their axial positions can be adjusted. On the other hand, the movable plate 10 of the mold clamping device is provided with a movable support rod 10a projecting toward the fixed plate 9 in parallel with the fixed support rod 9a. The movable support rod 10a has a movable support rod 10a.
The cam 11 is arranged such that its axial position is adjustable. The position of the second position detector 13 is matched with the position where the movable die 6 and the intermediate plate 5 are in contact with each other.
【００１３】また、アラ−ム発生用の２個のタイマ−
Ｌ，Ｍ（図３参照）を設けておき、型閉じ行程中カム１
１が第１位置検出器１２を打つと一方のタイマ−Ｌが作
動し、カム１１が第２位置検出器１３を打つと一方のタ
イマ−Ｌの作動を停止させると同時に他方のタイマ−Ｍ
が作動するようにし、カム１１が第２位置検出器１３を
打たないときには一方のタイマ−Ｌがタイムアップする
ようにし、さらに、カム１１が金型タッチ点位置検出器
１４を打つと他方のタイマ−Ｍの作動を停止させ、カム
１１が金型タッチ点位置検出器１４を打たないと他方の
タイマＭがタイムアップするようにアラ−ム回路を構成
する。Two timers for generating an alarm are also provided.
L and M (see FIG. 3) are provided and the cam 1 is used during the mold closing process.
When 1 hits the first position detector 12, one timer-L operates, and when the cam 11 hits the second position detector 13, one timer-L stops operating and the other timer-M simultaneously.
When the cam 11 does not hit the second position detector 13, one timer-L is timed up, and when the cam 11 hits the die touch point position detector 14, the other The alarm circuit is configured so that the operation of the timer M is stopped and the other timer M times up when the cam 11 does not hit the die touch point position detector 14.
【００１４】ここで、金型について説明する。Here, the mold will be described.
【００１５】固定型４に組合わされた固定側プレ−ト４
ａには、一対のガイドピン４ｂ、４ｃが突設され、各ガ
イドピン４ｂ、４ｃに案内された状態でスプリング３
ａ，３ｂが取付けられている。一方のガイドピン４ｃの
長さは他方のガイドピン４ｂより長尺であって、型開時
においても常時中間プレ−ト５が嵌合された状態となる
ように構成されている。可動型６は可動側プレ−ト６ａ
を介して可動盤１０に固定されており、その中空部には
複数の突出ピン１５ａを有するエジェクタプレ−ト１５
が配設されている。Fixed side plate 4 combined with fixed die 4
A pair of guide pins 4b and 4c is provided on a so as to project, and the spring 3 is guided by the guide pins 4b and 4c.
a and 3b are attached. The length of one guide pin 4c is longer than that of the other guide pin 4b, and the intermediate plate 5 is always fitted even when the mold is opened. The movable die 6 is a movable plate 6a.
The ejector plate 15 is fixed to the movable plate 10 through the hollow plate and has a plurality of protruding pins 15a in its hollow portion.
Are arranged.
【００１６】次に、上述した型締装置および金型を用い
た本発明の一実施例の各行程について説明する。Next, each process of one embodiment of the present invention using the mold clamping device and the mold described above will be described.
【００１７】図１に示すように、成形品１とスプルラン
ナが取り出されたのち、型閉じ行程が開始される。型閉
じを開始すると可動盤１０は固定盤９へ向って移動し、
カム１１が第１位置検出器１２を打つまでの間、可動盤
１０は高速・高圧から低速・低圧にスロ−ダウンする型
閉動作を行う。カム１１が第１位置検出器１２を打つ
と、図３に示す第１金型保護位置Ｆの位置状態であり、
この第１金型保護位置Ｆを検知すると可動盤１０の移動
速度および圧力は、金型保護１用速度Ｈおよび金型保護
１用圧力Ｉに切替わり、カム１１が次の第２位置検出器
１３を打つまでの間この移動速度および圧力で可動盤１
０を移動させる。As shown in FIG. 1, after the molded product 1 and the sprue runner are taken out, the mold closing process is started. When the mold closing is started, the movable platen 10 moves toward the fixed platen 9,
Until the cam 11 hits the first position detector 12, the movable platen 10 performs a mold closing operation of slowing down from high speed / high pressure to low speed / low pressure. When the cam 11 hits the first position detector 12, it is in the position state of the first mold protection position F shown in FIG.
When the first mold protection position F is detected, the moving speed and pressure of the movable platen 10 are switched to the mold protection 1 speed H and the mold protection 1 pressure I, and the cam 11 moves the next second position detector. Movable plate 1 at this moving speed and pressure until 13 is hit
Move 0.
【００１８】カム１１が第２位置検出器１３を打つと、
第２金型保護位置Ｇの位置状態であり、この第２金型保
護位置Ｇを検知すると、今までの可動盤１０の金型保護
１用速度Ｈおよび金型保護１用圧力Ｉは、金型保護２用
速度Ｊおよび金型保護２用圧力Ｋに切替わり、カム１１
が次の金型タッチ点位置検出器１４を打つまでの間この
移動速度および圧力で可動盤１０を移動させる。When the cam 11 hits the second position detector 13,
When the second mold protection position G is detected and the second mold protection position G is detected, the speed H for mold protection 1 and the pressure I for mold protection 1 of the movable plate 10 until now are The speed is switched to J for mold protection 2 and K for mold protection 2, and the cam 11
The movable platen 10 is moved at this moving speed and pressure until the next touches the die touch point position detector 14.
【００１９】ここで、金型保護１の行程中で図２に示す
ように異物１６が可動型６と中間プレ−ト５の間、すな
わちパ−ティング面７間に存在する場合について説明す
る。この場合、図３から明らかなように、金型保護１用
速度Ｈおよび金型保護１用圧力は、極低速・低圧であっ
てスプリング３による弾発力よりも小さいため、パ−テ
ィング面７間に異物が挟まれた状態になると可動盤１０
は停止する。その結果、カム１１は第２位置検出器１３
を打たないため、タイマ−Ｍは作動せず、タイマ−Ｌの
みが作動し、やがてタイムアップして金型保護異常を知
らせるアラ−ムを発生させる。Here, the case where the foreign matter 16 exists between the movable die 6 and the intermediate plate 5, that is, between the parting surface 7 as shown in FIG. 2 in the process of the die protection 1 will be described. In this case, as is apparent from FIG. 3, the speed H for the mold protection 1 and the pressure for the mold protection 1 are extremely low speed and low pressure and smaller than the elastic force of the spring 3, so that the partition surface 7 When a foreign object is caught between the movable platen 10
Will stop. As a result, the cam 11 moves to the second position detector 13
Since the timer is not hit, the timer-M does not operate, and only the timer-L operates, and eventually the time is up and an alarm for notifying the mold protection abnormality is generated.
【００２０】次にパ−テイング面７間に異物１６が存在
せず、中間プレ−ト５と固定側プレ−ト４ａの間、すな
わちスプリング面８間に存在する場合について説明す
る。Next, a description will be given of a case where the foreign matter 16 does not exist between the coating surfaces 7 but between the intermediate plate 5 and the stationary plate 4a, that is, between the spring surfaces 8.
【００２１】この場合、上述の如く可動盤１０は、金型
保護１用速度Ｈおよび金型保護１用圧力Ｉで移動を継続
し、可動型６と中間プレ−ト５とが接触したのち、カム
１１が第２位置検出器１３を打ち第２金型保護位置Ｇの
位置状態となる。第２金型保護位置Ｇを検知すると、可
動盤１０の移動速度および圧力が金型保護２用速度Ｊお
よび金型保護２用圧力Ｋに切替わるとともに他方のタイ
マＭが作動する。金型保護２用速度Ｊおよび金型保護２
用圧力Ｋはスプリング３による弾発力よりも大きいた
め、可動盤１０は金型保護２の行程に移行して移動す
る。しかし、スプリング面８に異物１６が挟まれた状態
（図示せず）になると、可動盤１０が停止する。その結
果、カム１１は金型タッチ点位置検出器１４を打たない
ため、タイマ−Ｍがタイムアップして金型保護異常を知
らせるアラ−ムを発生させる。In this case, as described above, the movable platen 10 continues to move at the speed H for mold protection 1 and the pressure I for mold protection 1, and after the movable mold 6 and the intermediate plate 5 come into contact with each other, The cam 11 hits the second position detector 13 to be in the second mold protection position G. When the second mold protection position G is detected, the moving speed and pressure of the movable platen 10 are switched to the mold protection 2 speed J and the mold protection 2 pressure K, and the other timer M is activated. Speed J for mold protection 2 and mold protection 2
Since the working pressure K is larger than the elastic force of the spring 3, the movable platen 10 moves to the stroke of the die protection 2. However, when the foreign matter 16 is sandwiched between the spring surfaces 8 (not shown), the movable platen 10 stops. As a result, since the cam 11 does not hit the die touch point position detector 14, the timer M times up and an alarm is generated to inform the die protection abnormality.
【００２２】上記実施例において、金型保護１用速度お
よび金型保護１用圧力、金型保護２用速度および金型保
護２用圧力共に、任意に設定可能にしておくと、スプリ
ングの弾発力の違う金型を用いる場合にも対応すること
ができる。In the above embodiment, if the speed for mold protection 1 and the pressure for mold protection 1 and the speed for mold protection 2 and the pressure for mold protection 2 can be set arbitrarily, the spring will spring. It can also be used when using dies with different strengths.
【００２３】[0023]
【発明の効果】本発明は、上述のとおり構成されている
ので、次に記載するような効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００２４】従来の１段金型保護制御方法にみられるよ
うな金型内スプリングの弾発力の強さに影響されるとい
うことがなく、金型のパ−ティング面の金型保護異常を
検知して可動盤を停止するので、より確実な金型保護が
実現できる。There is no influence on the strength of the elastic force of the in-mold spring, which is seen in the conventional one-step mold protection control method, and abnormal mold protection on the parting surface of the mold is prevented. Since it detects and stops the movable plate, more reliable mold protection can be realized.
【図１】本発明の型開完了後成形品を突出した状態を示
す部分断面図である。FIG. 1 is a partial cross-sectional view showing a state in which a molded product is projected after completion of mold opening of the present invention.
【図２】本発明の型閉じ行程中の異物の検知する状態を
示す部分断面図である。FIG. 2 is a partial cross-sectional view showing a state in which foreign matter is detected during the mold closing process of the present invention.
【図３】本発明の型閉じ動作線図である。FIG. 3 is a mold closing operation diagram of the present invention.
【図４】従来例の型閉じ動作線図である。FIG. 4 is a mold closing operation diagram of a conventional example.
１ 成形品 ２ スプルランナ ３ スプリング ４ 固定型 ５ 中間プレ−ト ６ 可動型 ７ パ−ティング面 ８ スプリング面 ９ 固定盤 １０ 可動盤 １１ カム １２ 第１位置検出器 １３ 第２位置検出器 １４ 金型タッチ点位置検出器 1 Molded Product 2 Sprue Runner 3 Spring 4 Fixed Type 5 Intermediate Plate 6 Movable Type 7 Parting Surface 8 Spring Surface 9 Fixed Plate 10 Movable Plate 11 Cam 12 First Position Detector 13 Second Position Detector 14 Mold Touch Point position detector
Claims (2)
中間プレ−トを有し、前記固定型および可動型のいずれ
か一方の型と前記中間プレ−トとの間にスプリングを介
在させた金型を取付けた型締装置の型閉じ方法におい
て、 前記可動盤を移動させるための移動速度および圧力を、
高速・高圧から低速・低圧にスロ−ダウンしたのち、極
低速・低圧の金型保護行程に切替えて型閉じを行う金型
保護制御方法であって、前記金型保護行程中における前
記可動盤を移動させるための移動速度および圧力を、前
記中間プレ−トと一方の型とが接触する前は前記スプリ
ングの弾発力よりも小さい力の極低速・低圧とし、前記
中間プレ−トと一方の型とが接触した後は、前記スプリ
ングの弾発力よりも大きい力の極低速・低圧に切替える
ことを特徴とする射出成形機における二段金型保護制御
方法。1. At least one intermediate plate is provided between the fixed mold and the movable mold, and a spring is provided between one of the fixed mold and the movable mold and the intermediate plate. In the mold closing method of the mold clamping device with the interposed mold attached, the moving speed and pressure for moving the movable plate are
A mold protection control method in which the mold is closed by switching from a high speed / high pressure to a low speed / low pressure and then switching to an extremely low speed / low pressure mold protection process. Before moving the intermediate plate and one of the molds, the moving speed and pressure are set to an extremely low speed and low pressure that is smaller than the elastic force of the spring, and the intermediate plate and one of the molds are moved. After the contact with the mold, a two-stage mold protection control method in an injection molding machine is characterized in that the force is switched to an extremely low speed / low pressure that is larger than the elastic force of the spring.
び圧力が可変であることを特徴とする射出成形機におけ
る二段金型保護制御方法。2. A two-stage mold protection control method in an injection molding machine, wherein a moving speed and a pressure for moving the movable platen are variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323292A JPH05185483A (en) | 1992-01-13 | 1992-01-13 | Controlling method for two-stage mold protection in injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2323292A JPH05185483A (en) | 1992-01-13 | 1992-01-13 | Controlling method for two-stage mold protection in injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05185483A true JPH05185483A (en) | 1993-07-27 |
Family
ID=12104877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2323292A Pending JPH05185483A (en) | 1992-01-13 | 1992-01-13 | Controlling method for two-stage mold protection in injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05185483A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104943100A (en) * | 2014-03-26 | 2015-09-30 | 住友重机械工业株式会社 | Injection molding machine |
| CN107972242A (en) * | 2017-11-30 | 2018-05-01 | 海天塑机集团有限公司 | The die sinking method and drive system of double-plate injection moulding machine floating die assembly |
-
1992
- 1992-01-13 JP JP2323292A patent/JPH05185483A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104943100A (en) * | 2014-03-26 | 2015-09-30 | 住友重机械工业株式会社 | Injection molding machine |
| KR20170017968A (en) * | 2014-03-26 | 2017-02-15 | 스미도모쥬기가이고교 가부시키가이샤 | Injection molding machine |
| CN107972242A (en) * | 2017-11-30 | 2018-05-01 | 海天塑机集团有限公司 | The die sinking method and drive system of double-plate injection moulding machine floating die assembly |
| CN107972242B (en) * | 2017-11-30 | 2023-11-14 | 海天塑机集团有限公司 | Mold opening method and driving system for spring mold of two-plate injection molding machine |
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