JPH07186214A - Screw member for injection-molding machine - Google Patents
Screw member for injection-molding machineInfo
- Publication number
- JPH07186214A JPH07186214A JP32930593A JP32930593A JPH07186214A JP H07186214 A JPH07186214 A JP H07186214A JP 32930593 A JP32930593 A JP 32930593A JP 32930593 A JP32930593 A JP 32930593A JP H07186214 A JPH07186214 A JP H07186214A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- screw member
- ring valve
- screw head
- injection
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
- B29C2045/526—Abrasion resistant means in the screw head or non-return device
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形機に使用され
るスクリュー部材に関し、更に詳細には、セラミックス
用インラインスクリュー式射出成形機に使用されるリン
グバルブ及びスクリューヘッド等の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw member used in an injection molding machine, and more particularly to improvement of a ring valve, a screw head and the like used in an in-line screw type injection molding machine for ceramics.
【０００２】[0002]
【従来の技術】従来、射出成形機のリングバルブ、スク
リューヘッド等には、硬質合金、サーメット等が使用さ
れており、特に、摩耗の激しい成形材料を用いる場合に
は、ＷＣ、ＴｉＣ等の硬質物質を溶射法又はＣＶＤによ
り前記リングバルブ等に更に被覆して使用していた。2. Description of the Related Art Conventionally, hard alloys, cermets, etc. have been used for ring valves, screw heads, etc. of injection molding machines. Especially, when a molding material with severe wear is used, WC, TiC, etc. The ring valve and the like were further coated with the substance by a thermal spraying method or CVD and used.
【０００３】しかし、セラミックス製品や粉末冶金製品
の射出成形機においては、リングバルブ、スクリューヘ
ッド等の部品は、摺動部に硬質のセラミックス材が介在
するため、ＷＣ、ＴｉＣ等の硬質物質を被覆したもので
あっても激しい摩擦に耐えられず摩耗してしまうという
問題があり、特に、ＷＣ、ＴｉＣ被覆層の厚みは１０μ
ｍ程度とわずかであるため、母体金属が局部的に露出す
ると、その部分を中心に急激に摩耗が進行するという問
題があった。However, in an injection molding machine for ceramic products and powder metallurgy products, since parts such as ring valves and screw heads have a hard ceramic material in the sliding portion, they are coated with a hard material such as WC or TiC. However, there is a problem in that it cannot withstand severe friction and is worn away. Especially, the thickness of the WC and TiC coating layer is 10 μm.
Since it is as small as about m, there is a problem that when the base metal is locally exposed, the wear rapidly progresses around that part.
【０００４】本発明者は、このような問題点を解決すべ
く、特願平４−７７１５９号において、スクリューヘッ
ド及びリングバルブの双方又はいずれか一方が、高温耐
摩耗性を有する樹脂材料を用いて構成された射出成形用
スクリュー部材を提案し、この際に用いる樹脂材料とし
ては、６０×１０-6／℃以下の熱膨張係数及び１００℃
以上の熱変形温度を有するものが好ましいことを開示し
た。In order to solve such a problem, the present inventor has proposed in Japanese Patent Application No. 4-77159 that both or one of the screw head and the ring valve uses a resin material having high-temperature wear resistance. We propose a screw member for injection molding composed of the following, and as the resin material used at this time, a thermal expansion coefficient of 60 × 10 −6 / ° C. or less and 100 ° C.
It has been disclosed that those having the above heat distortion temperature are preferable.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、本発明
者が、このようなヘッド及びバルブの材質について更に
検討を加えた結果、耐摩耗性及び機械的強度等につい
て、以下に示すような更なる改善の余地があることが判
明した。即ち、前記特願平４−７７１５９号記載の樹脂
材料を用いて前記ヘッド及びバルブを作製しても、成形
回数が数千ショット以上という厳しい条件下では、特に
リングバルブが数十μｍ程度で摩耗し、この樹脂材料が
成形すべき射出成形体に不純物として混入することが判
明した。本発明は、このような知見に基づいてなされた
ものであり、その目的とするところは、耐熱性、耐摩耗
性に優れ、且つその耐久性が向上した射出成形機用スク
リュー部材を提供することにある。However, as a result of further studies by the present inventor on the material of such a head and valve, the wear resistance and mechanical strength are further improved as described below. It turns out that there is room for. That is, even when the head and the valve are manufactured by using the resin material described in the above-mentioned Japanese Patent Application No. 4-77159, the ring valve is worn out by several tens of μm under a severe condition that the molding number is several thousand shots or more. However, it was found that this resin material was mixed as an impurity in the injection-molded body to be molded. The present invention has been made on the basis of such findings, and an object thereof is to provide a screw member for an injection molding machine, which has excellent heat resistance and wear resistance, and whose durability is improved. It is in.
【０００６】[0006]
【課題を解決するための手段】本発明者は、前記目的を
達成すべく鋭意研究した結果、セラミックス焼結体を用
いてスクリューヘッド及び／又はリングバルブを構成
し、これら両部材をスクリュー部材に配設することによ
り、前記目的が達成できることを見出し、本発明を完成
するに至った。従って、本発明の射出成形機用スクリュ
ー部材は、射出成形機の射出部に用いるスクリュー部材
において、このスクリュー部材はスクリューヘッドとリ
ングバルブを備え、前記スクリューヘッド及びリングバ
ルブの双方又はいずれか一方が、セラミックス焼結体を
用いて成ることを特徴とする。Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventor has constructed a screw head and / or a ring valve by using a ceramics sintered body, and uses both of these members as a screw member. It has been found that the above-mentioned object can be achieved by disposing it, and the present invention has been completed. Therefore, the screw member for an injection molding machine of the present invention is a screw member used in an injection part of an injection molding machine, the screw member includes a screw head and a ring valve, and either or both of the screw head and the ring valve are provided. , A ceramics sintered body is used.
【０００７】以下、本発明のスクリュー部材に配設した
スクリューヘッド及びリングバルブについて説明する。
これらスクリューヘッド及びリングバルブは、金属製の
加熱シリンダ内に設置されており、スクリューヘッドが
リングバルブに挿入された状態で配設されている。The screw head and ring valve arranged on the screw member of the present invention will be described below.
The screw head and the ring valve are installed in a metal heating cylinder, and the screw head is arranged in a state of being inserted into the ring valve.
【０００８】射出成形の際、成形材料は、加熱シリンダ
内に充填された後、スクリューヘッドと嵌合しているス
クリューの回転を介してスクリューヘッド及びリングバ
ルブの方に押し出される。次いで、成形材料は、このス
クリューヘッドとリングバルブとのなす間隙を介して前
記加熱シリンダの先端部に一定量押し出され、これによ
り、成形材料の計量を行なう。そして、この計量の後、
前記スクリューを前進させ、成形材料を金型キャビティ
に射出し、射出成形を完了する。In injection molding, the molding material is filled in the heating cylinder and then extruded toward the screw head and the ring valve through the rotation of the screw fitted to the screw head. Then, the molding material is extruded by a certain amount through the gap between the screw head and the ring valve to the tip of the heating cylinder, whereby the molding material is measured. And after this weighing
The screw is advanced, the molding material is injected into the mold cavity, and the injection molding is completed.
【０００９】この射出の際、リングバルブの後端部はス
クリューの先端部に設けた弁座と当接し、成形材料が逆
流するのを防止する。このように、リングバルブには、
成形材料の流れる方向を制御する機能がある。従って、
加熱シリンダとリングバルブとの間のクリアランスを所
定の大きさに保つ必要がある。このクリアランスは、一
般に約２０〜５０μｍとするのが適当とされている。At the time of this injection, the rear end of the ring valve contacts the valve seat provided at the front end of the screw to prevent the molding material from flowing backward. In this way, the ring valve has
It has the function of controlling the flow direction of the molding material. Therefore,
It is necessary to keep the clearance between the heating cylinder and the ring valve to a predetermined size. It is generally considered appropriate that this clearance be approximately 20 to 50 μm.
【００１０】次に、前記スクリューヘッド及びリングバ
ルブを構成するセラミックス焼結体について説明する。
このセラミックス焼結体としては、特に限定されるもの
ではないが、耐熱性、耐摩耗性の外に、一定の靱性を有
するものが好ましく、具体的には、ＪＩＳ Ｒ１６０１
で規定される４点曲げ強度が７０ｋｇ／ｍｍ2以上であ
り、気孔についても最大気孔径が２０μｍ未満で、平均
気孔径が５μｍ未満のものがよく、このうちＳｉ3Ｎ4及
び部分安定化ジルコニア（ＰＳＺ）が好ましい。これら
の特性を満足しない材料においては、射出成形中に破損
したり、摩耗の度合いが激しくなる。特に、リングバル
ブについてはこの傾向が顕著である。また、気孔の測定
は、被測定材を０．１ｓ以下に鏡面ラップし、得られた
面を、４００倍の金属顕微鏡を用いてカールツァイス社
製のＩＢＡＳ２０００ソフトにより測定することができ
る。Next, the ceramic sintered body constituting the screw head and the ring valve will be described.
The ceramic sintered body is not particularly limited, but it is preferable that the ceramic sintered body has a certain toughness in addition to heat resistance and wear resistance. Specifically, JIS R1601
It is preferable that the four-point bending strength is 70 kg / mm 2 or more, the maximum pore diameter is less than 20 μm, and the average pore diameter is less than 5 μm. Of these, Si 3 N 4 and partially stabilized zirconia are preferable. (PSZ) is preferred. A material that does not satisfy these characteristics will be damaged during injection molding, or the degree of wear will be severe. This tendency is particularly remarkable for ring valves. Further, the pores can be measured by mirror-wrapping the material to be measured for 0.1 s or less, and the obtained surface can be measured with an IBAS2000 software manufactured by Carl Zeiss Co., Ltd. using a 400 × metallurgical microscope.
【００１１】[0011]
【実施例】以下、本発明を、図面を参照して実施例及び
比較例により詳細に説明する。図１に、本発明のスクリ
ュー部材の一例を示す。このスクリュー部材は、リング
バルブ１０とスクリューヘッド２０を備える。このリン
グバルブ１０は円筒状をなし、先端側に複数の成形材料
通過溝１２を備える。また、前記スクリューヘッド２０
は、円柱状のスクリューヘッド本体２２の先端側に尖頭
部２４を備えている。The present invention will be described in detail below with reference to the drawings by way of examples and comparative examples. FIG. 1 shows an example of the screw member of the present invention. The screw member includes a ring valve 10 and a screw head 20. The ring valve 10 has a cylindrical shape and has a plurality of molding material passage grooves 12 on the tip side. Also, the screw head 20
Is equipped with a pointed portion 24 on the tip side of a cylindrical screw head body 22.
【００１２】図２は、本発明のスクリュー部材を用いた
射出成形機の一例を示す断面図である。同図において、
スクリューヘッド２０はリングバルブ１０に挿入されて
おり、このスクリューヘッド２０は弁座３２を介してス
クリュー３０と嵌合している。これらバルブ１０、ヘッ
ド２０及びスクリュー３０は、はぼ円筒状の加熱シリン
ダ４０内に設置されており、この加熱シリンダ４０はバ
ンドヒータ５０に包囲されている。そして、加熱シリン
ダ４０の後方部にはホッパー６０が設けられており、こ
のホッパー６０に成形材料が貯蔵されている。成形材料
は、加熱シリンダ４０の前方に設置されている成形型７
０に射出される。FIG. 2 is a sectional view showing an example of an injection molding machine using the screw member of the present invention. In the figure,
The screw head 20 is inserted into the ring valve 10, and the screw head 20 is fitted with the screw 30 via a valve seat 32. The valve 10, head 20 and screw 30 are installed in a hollow cylindrical heating cylinder 40, and the heating cylinder 40 is surrounded by a band heater 50. A hopper 60 is provided at the rear of the heating cylinder 40, and the molding material is stored in the hopper 60. The molding material is the molding die 7 installed in front of the heating cylinder 40.
It is ejected to 0.
【００１３】図３は、図２の射出成形機の部分断面図で
ある。同図において、リングバルブ１０の外周壁部と加
熱シリンダ４０の内周壁部とのクリアランスＣは、約２
０〜５０μｍである。射出成形するに当たっては、まず
成形材料の計量を行なう。計量は、図３に示す状態から
スクリュー３０及びスクリューヘッド２０を図示矢印Ａ
の方向に回転させながら後退させ、加熱シリンダ４０に
充填されていた成形材料を図示矢印Ｂの方向に押し出
し、成形材料の一定量を前記リングバルブ１０の成形材
料通過溝１２を介して加熱シリンダ４０の先端部４２に
押し出すことにより行なう（図４参照）。FIG. 3 is a partial sectional view of the injection molding machine of FIG. In the figure, the clearance C between the outer peripheral wall of the ring valve 10 and the inner peripheral wall of the heating cylinder 40 is about 2
It is 0 to 50 μm. In injection molding, the molding material is first weighed. For the measurement, the screw 30 and the screw head 20 are indicated by the arrow A from the state shown in FIG.
The molding material filled in the heating cylinder 40 is extruded in the direction of arrow B shown in the drawing, and a fixed amount of the molding material is passed through the molding material passage groove 12 of the ring valve 10 to rotate the heating cylinder 40. It is carried out by pushing it out to the front end portion 42 (see FIG. 4).
【００１４】この計量の際、スクリューヘッド２０の尖
頭部２４の底面部２６とリングバルブ１０の先端側の頂
部１６とは、成形材料の反発力によって押圧される。ま
た、前述のようにスクリュー３０及びスクリューヘッド
２０は回転駆動するため、前記底面部２６と頂部１６と
によって摺動部分が構成されることになる。従って、前
述の如く、本発明の射出成形機用スクリュー部材として
は、この摺動部分を構成する底面部２６又は頂部１６の
いずれか一方がセラミックス材料で形成されていれば所
期の効果を奏することが可能である。なお、図１に示す
ように、スクリューヘッド本体２２の外周部に、セラミ
ックス材料製の環状部材２８を装着することによっても
所期の効果が得られる。During this measurement, the bottom surface portion 26 of the pointed portion 24 of the screw head 20 and the top portion 16 of the ring valve 10 on the tip side are pressed by the repulsive force of the molding material. Further, since the screw 30 and the screw head 20 are rotationally driven as described above, the bottom surface portion 26 and the top portion 16 form a sliding portion. Therefore, as described above, as the screw member for an injection molding machine of the present invention, if either the bottom surface portion 26 or the top portion 16 forming the sliding portion is formed of a ceramic material, the desired effect is obtained. It is possible. It should be noted that, as shown in FIG. 1, the desired effect can also be obtained by mounting an annular member 28 made of a ceramic material on the outer peripheral portion of the screw head body 22.
【００１５】次いで、この計量の後に、図５に示すよう
にスクリュー３０を回転させずに加熱シリンダ４０の先
端方向に前進させ、一定量の成形材料を前記成形型７０
に射出する。この射出の際、リングバルブ１０の後端部
１８はスクリュー３０の先端部に設けた弁座３２と当接
し、成形材料が逆流するのを防止する。このように、リ
ングバルブ１０には、成形材料の流れる方向を制御する
機能がある。従って、加熱シリンダ４０とリングバルブ
１０との間のクリアランスＣを所定の大きさに保つ必要
がある。Then, after this measurement, as shown in FIG. 5, the screw 30 is advanced in the direction of the tip of the heating cylinder 40 without rotating, and a certain amount of molding material is applied to the molding die 70.
Inject. At the time of this injection, the rear end portion 18 of the ring valve 10 contacts the valve seat 32 provided at the front end portion of the screw 30 to prevent the molding material from flowing backward. In this way, the ring valve 10 has a function of controlling the flowing direction of the molding material. Therefore, it is necessary to maintain the clearance C between the heating cylinder 40 and the ring valve 10 at a predetermined size.
【００１６】（スクリュー部材の作製例）リングバルブ
１０及びスクリューヘッド２２を各種材料で構成する
か、又はこれらを各種材料で被覆することにより、スク
リュー部材を作製した。なお、材料を被覆した場合のバ
ルブ１０及び／又はヘッド２２の母体材質は、ＳＫＤ１
１である。これらバルブ及びヘッドの材質及び適用方法
を表１に示す。(Example of manufacturing screw member) The screw member was manufactured by forming the ring valve 10 and the screw head 22 with various materials or by coating these with various materials. The base material of the valve 10 and / or the head 22 when coated with the material is SKD1.
It is 1. Table 1 shows the materials and application methods of these valves and heads.
【００１７】（性能評価）表１に示した各種バルブ及び
ヘッドにつき以下に示す試験を行ないその性能を評価し
た。即ち、Ｓｉ3Ｎ4粉末５０容量％とワックス及び樹脂
の混合物５０容量％とを混合・混練し、直径４〜８ｍｍ
×高さ１〜８ｍｍのペレットを形成した。このペレット
を用い、前記各種バルブ及びヘッドを装着した射出成形
機によりセラミックターボチャージャーロータを成形
し、ショット数に対応した摩耗量を測定した。摩耗量
は、各種バルブ及びヘッドの前記頂部１６及び底面部２
６を表面粗さ計で測定し、その摩耗の深さとした。得ら
れた結果を表１に示した。また、Ｓｉ3Ｎ4焼結体の平均
気孔径及び最大気孔径については、焼結体表面を０．１
ｓ以下に鏡面ラップし、得られた面を４００倍の金属顕
微鏡を用いてカールツァイス社製のＩＢＡＳ２０００ソ
フトにより測定した。得られた結果を表１に付記する。(Performance Evaluation) Various valves and heads shown in Table 1 were subjected to the following tests to evaluate their performance. That is, 50% by volume of Si 3 N 4 powder and 50% by volume of a mixture of wax and resin are mixed and kneaded to have a diameter of 4 to 8 mm.
× Pellets having a height of 1 to 8 mm were formed. Using this pellet, a ceramic turbocharger rotor was molded by an injection molding machine equipped with the various valves and heads, and the wear amount corresponding to the number of shots was measured. The amount of wear depends on the top 16 and bottom 2 of various valves and heads.
No. 6 was measured with a surface roughness meter, and it was defined as the wear depth. The obtained results are shown in Table 1. Further, regarding the average pore diameter and the maximum pore diameter of the Si 3 N 4 sintered body, 0.1
The surface obtained was mirror-lapped to s or less, and the obtained surface was measured by IBAS2000 software manufactured by Carl Zeiss Co., Ltd. using a 400 × metallographic microscope. The results obtained are shown in Table 1.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１に示したように、スクリューヘッド及
び／又はリングバルブに特定のセラミックス材料を適用
することにより、１０００回ものショット回数でも極め
て摩耗量が少なく、耐久性が著しく向上したスクリュー
部材が得られることがわかる。As shown in Table 1, by applying a specific ceramic material to the screw head and / or the ring valve, a screw member having extremely small wear amount even after 1000 shots and significantly improved durability can be obtained. You can see that you can get it.
【００２０】以上、本発明を実施例により説明したが、
本発明はこれに限定されるものではなく本発明の要旨の
範囲内で種々の変形が可能である。例えば、リングバル
ブの成形材料通過溝の個数は適宜変更できる。また、本
発明のスクリュー部材は、セラミック製品の製造みなら
ず、粉末冶金等に使用することもできる。The present invention has been described above with reference to the embodiments.
The present invention is not limited to this, and various modifications can be made within the scope of the gist of the present invention. For example, the number of molding material passage grooves of the ring valve can be appropriately changed. Further, the screw member of the present invention can be used not only for manufacturing ceramic products but also for powder metallurgy and the like.
【００２１】[0021]
【発明の効果】以上説明したように、本発明によれば、
セラミックス焼結体を用いてスクリューヘッド及び／又
はリングバルブを構成し、これら両部材をスクリュー部
材に配設することとしたため、耐熱性、耐摩耗性に優
れ、且つその耐久性が向上した射出成形機用スクリュー
部材を提供することができる。また、耐摩耗性が良好で
あることより、成形品に不純物が混入すること等を防止
でき、良好な成形品を得ることができる。As described above, according to the present invention,
Injection molding with excellent heat resistance and wear resistance, and improved durability, because a screw head and / or ring valve was constructed using a ceramics sintered body and both members were arranged on the screw member. A machine screw member can be provided. Further, since the wear resistance is good, it is possible to prevent impurities from being mixed into the molded product, and a good molded product can be obtained.
【図１】本発明のスクリュー部材の一例を示す斜視図で
ある。FIG. 1 is a perspective view showing an example of a screw member of the present invention.
【図２】本発明のスクリュー部材を用いた射出成形機の
一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of an injection molding machine using the screw member of the present invention.
【図３】図２の射出成形機の部分断面図である。3 is a partial cross-sectional view of the injection molding machine of FIG.
【図４】計量の際の図２の射出成形機の部分断面図であ
る。4 is a partial cross-sectional view of the injection molding machine of FIG. 2 during weighing.
【図５】射出の際の図２の射出成形機の部分断面図であ
る。5 is a partial cross-sectional view of the injection molding machine of FIG. 2 during injection.
１０ リングバルブ、１２ 成形材料通過溝、１６
頂部、２０ スクリューヘッド、２２ ヘッド
本体、２４ 尖頭部、２６ 底部、２８環状部材。
３０ スクリュー、４０ 加熱シリンダ、５０
バンドヒータ、６０ ホッパー、７０ 成形型10 ring valve, 12 molding material passage groove, 16
Top part, 20 screw head, 22 head body, 24 pointed head, 26 bottom part, 28 annular member.
30 screw, 40 heating cylinder, 50
Band heater, 60 hopper, 70 mold
Claims (2)
部材において、このスクリュー部材はスクリューヘッド
とリングバルブを備え、前記スクリューヘッド及びリン
グバルブの双方又はいずれか一方が、セラミックス焼結
体を用いて成ることを特徴とする射出成形機用スクリュ
ー部材。1. A screw member used in an injection part of an injection molding machine, wherein the screw member includes a screw head and a ring valve, and both or one of the screw head and the ring valve uses a ceramic sintered body. A screw member for an injection molding machine, which is characterized by being made.
ｍｍ2以上の曲げ強度を有し、最大気孔径２０μｍ未
満、平均気孔径５μｍ未満のＳｉ3Ｎ4又は部分安定化ジ
ルコニアであることを特徴とする請求項１記載のスクリ
ュー部材。2. The ceramic sintered body is 90 kg /
The screw member according to claim 1, which is a Si 3 N 4 or partially stabilized zirconia having a bending strength of mm 2 or more and a maximum pore diameter of less than 20 μm and an average pore diameter of less than 5 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32930593A JPH07186214A (en) | 1993-12-27 | 1993-12-27 | Screw member for injection-molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32930593A JPH07186214A (en) | 1993-12-27 | 1993-12-27 | Screw member for injection-molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07186214A true JPH07186214A (en) | 1995-07-25 |
Family
ID=18219980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32930593A Pending JPH07186214A (en) | 1993-12-27 | 1993-12-27 | Screw member for injection-molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07186214A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011088410A (en) * | 2009-10-26 | 2011-05-06 | Silver Roi:Kk | Ultra hard material for molding and molding machine carrying the ultra hard material |
| KR101380736B1 (en) * | 2012-05-18 | 2014-04-03 | 전혜숙 | Cylinder and head set having function for preventing wear and manufacturing method therefor |
| JP2017056655A (en) * | 2015-09-17 | 2017-03-23 | 東洋機械金属株式会社 | Injection molding machine |
-
1993
- 1993-12-27 JP JP32930593A patent/JPH07186214A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011088410A (en) * | 2009-10-26 | 2011-05-06 | Silver Roi:Kk | Ultra hard material for molding and molding machine carrying the ultra hard material |
| KR101380736B1 (en) * | 2012-05-18 | 2014-04-03 | 전혜숙 | Cylinder and head set having function for preventing wear and manufacturing method therefor |
| JP2017056655A (en) * | 2015-09-17 | 2017-03-23 | 東洋機械金属株式会社 | Injection molding machine |
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