JPH0422127B2 - - Google Patents
Info
- Publication number
- JPH0422127B2 JPH0422127B2 JP60090336A JP9033685A JPH0422127B2 JP H0422127 B2 JPH0422127 B2 JP H0422127B2 JP 60090336 A JP60090336 A JP 60090336A JP 9033685 A JP9033685 A JP 9033685A JP H0422127 B2 JPH0422127 B2 JP H0422127B2
- Authority
- JP
- Japan
- Prior art keywords
- resistant
- build
- screw
- layer
- base material
- 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
- 239000000463 material Substances 0.000 claims description 32
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 13
- 230000007797 corrosion Effects 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 21
- 238000005452 bending Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 2
- -1 TiC Chemical class 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 description 1
- 229910033181 TiB2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/507—Screws characterised by the material or their manufacturing process
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
〔産業上の利用分野〕
本発明は、射出成形機、押出機等用のスクリユ
ー（以下スクリユーと記す）に関し、特に、粉体
肉盛り溶接により、耐食性又は及び耐摩耗性を与
えたスクリユーに関する。
〔従来の技術〕
スクリユーのうち、従来特に高度の耐摩耗性や
耐食性が要求される用途に対し、例えば特に腐食
作用の大きい弗素樹脂等用には、ハステロイ系合
金が、また耐食性とともに耐摩耗性が要求される
用途には、高Ｃ高Cr系の特殊鋼等が使用されて
いた。
しかし、近年充填材入り樹脂の増加や、特に摩
耗作用の激しいプラスチツクマグネツト，ゴムマ
グネツト，セラミツクス等、従来よりさらに摩耗
作用の激しい材料に対し、射出成形等が採用され
るようになり、上記特殊鋼等では必ずしも要求を
満足し得なくなつている。
このため、母材の表面に溶接棒を使用した肉盛
り溶接を施すことが提案されている。この溶接棒
を使用する溶接層は、溶接によるので母材との結
合力は強いが、溶接棒の製造上の問題から、溶接
棒の直径等に制約があり、また材質上の制約から
特に耐摩耗性の高い肉盛り層を得ることができな
い。
また、上記溶接棒を使用する肉盛り溶接に対
し、粉体を使用する粉体肉盛り溶接によるスクリ
ユーの提案がある。例えば、特開昭59−143061号
は、母材の山形の頂面に溝状凹部を形成し、この
凹部に金属の酸化物、窒化物等の粉末とこれらよ
り低融点の合金粉末との混合物を使用して、粉体
肉盛り溶接することを開示している。しかし、こ
れは、スクリユーが挿入されるシリンダの内面と
山形の頂面が摩擦することによる被押出物の変質
を防止するもので、山形の頂面のみを対象とする
ものである。
〔発明が解決しようとする問題点〕
本発明者らは、肉盛り溶接スクリユーの製造方
法及び製品について種々実験検討した。この結
果、溶接棒、粉体を問わず肉盛り溶接によつて、
特に母材がフエライト系、マルテンサイト系のス
クリユーや細物スクリユーにおいて、大きい曲り
や長さの大幅な縮少が発生し易いこと、肉盛り層
の凝固組織が耐摩耗性に影響を与えること等を知
見した。
本発明は、これらの知見に基づいて、製造にお
ける曲りや長さ縮少を大幅に抑制し、耐摩耗性を
向上したスクリユーを提供することを目的とす
る。
〔問題を解決するための手段〕
本発明は、母材をオーステナイト系材料とし、
肉盛り溶接層は主に山形の長手方向の凝固組織を
有し、Co基，Fe基もしくはNi基合金又はこれら
の合金に硬質粒子を分散保持する粉体肉盛り溶接
層であり、かつ谷部における肉盛り層の厚さが該
谷部の直径の15％以下であることを特徴とする耐
食、耐摩スクリユーである。肉盛り溶接層は上記
の合金のみ粉体肉盛りでも耐摩耗性を付与できる
が、用途によつて、より高い耐摩耗性が必要な場
合には、後述する硬質粒子を分散させる。
肉盛り層の厚さが、谷部の直径の15％を越える
と肉盛り溶接後のスクリユーの曲りや長さ方向の
収縮が大きくなるので15％以下に限定した。
本発明に使用する硬質粒子としては、WC，
TiC，VC，Cr7C3等の金属酸化物、TiN等の窒化
物、TiB2等のほう化物、Al2O3，SiO2，ZrO2等
の酸化物等が適当であり、さらに母材としては
HBブリネル硬さHB201以上のオーステナイト系
材料が有効である。
〔作用〕
本発明のスクリユーは、肉盛り用母材として熱
膨脹係数の大きいオーステナイト系材料を使用し
ているため、肉盛り時の母材温度での熱膨脹量が
フエライト系の材料の場合より大きく、肉盛り後
の冷却時肉盛り層に引張応力を残存しにくいこ
と、また、母材は、高温強度がフエライト系材料
に対して高く、肉盛り層の降温時の収縮にともな
う母材の軸方向に沿う圧縮応力の作用に耐え母材
の軸方向の収縮を防ぐことができ、また同様に肉
盛り後の曲がりを防止できる特性を有するかであ
る。特に母材の常温硬さをブリネル硬さHB201
以上とすることにより曲り、長さ縮少を軽減でき
る。
肉盛り層に作用する引張応力が小さいことは、
肉盛り層のクラツクの発生の危険性を減じ、肉盛
り表面層により高硬度で耐食、耐摩耗性の高い肉
盛り材質を肉盛りすることができ、より高級なス
クリユーを提供することを可能とする。
次に本発明のスクリユーの肉盛り溶接層につい
て述べる。本発明のスクリユーの肉盛り層は、溶
接によるものであり、母材との間に強い結合力
で、かつ拡散層を介して固着されているから熱応
力も拡散層で分散され耐剥離性は大きい。
この肉盛り層は、各成分及びその配合比を任意
に選定できる粉末を溶融した溶融物によるので、
耐摩耗性を十分高くすることができる。
また、最も耐摩耗性を要求されるスクリユーの
山形部の肉盛り層の凝固組織は、肉盛りの進行方
向、つまり山形の長手方向の成分を有して伸びる
凝固組織であり、この山形の長手方向成分は被射
出材との摩擦の方向と一致するのでとくに高い耐
摩耗性を示す。
〔実施例〕
表１に本発明におけるスクリユー母材と肉盛り
材との組合せの例、及び肉盛り層の硬さ並びに比
較材として、従来のSKD１１との耐食性と耐摩
耗性の比較結果を示す。また表２に使用した合金
の組成を示す。なお本データは、立方体状の母材
の全面にプラズマ粉体肉盛りしたテストピースに
よるものである。
[Industrial Application Field] The present invention relates to a screw for an injection molding machine, an extruder, etc. (hereinafter referred to as a screw), and particularly to a screw that has been given corrosion resistance or wear resistance by powder overlay welding. [Prior Art] Conventionally, Hastelloy alloys have been used for screws that require particularly high wear resistance and corrosion resistance, such as fluororesin, which has a particularly strong corrosive effect. For applications that require high C and high Cr special steels, etc. have been used. However, in recent years, the use of resins containing fillers has increased, and injection molding has been adopted for materials that are more abrasive than before, such as plastic magnets, rubber magnets, and ceramics, which are particularly abrasive. etc. are no longer necessarily able to satisfy the requirements. For this reason, it has been proposed to perform overlay welding on the surface of the base material using a welding rod. The weld layer using this welding rod is welded, so it has a strong bond with the base metal, but due to problems in manufacturing the welding rod, there are restrictions on the diameter of the welding rod, and due to material restrictions, it is particularly durable. It is not possible to obtain a built-up layer with high wear resistance. Furthermore, in contrast to build-up welding using the above-mentioned welding rod, there is a proposal for screwing by powder build-up welding using powder. For example, JP-A No. 59-143061 discloses that a groove-like recess is formed on the top surface of a chevron-shaped base material, and a mixture of powders of metal oxides, nitrides, etc. and alloy powders having a lower melting point than these is formed in the recess. It is disclosed that powder overlay welding is performed using. However, this method is intended to prevent deterioration of the extruded material due to friction between the inner surface of the cylinder into which the screw is inserted and the top surface of the chevron, and is intended only for the top surface of the chevron. [Problems to be Solved by the Invention] The present inventors conducted various experiments and studies on manufacturing methods and products for overlay welding screws. As a result, by overlay welding regardless of welding rod or powder,
In particular, screws and thin screws whose base material is ferrite or martensitic are susceptible to large bends or significant reductions in length, and the solidification structure of the built-up layer affects wear resistance. I found out. Based on these findings, the present invention aims to provide a screw that significantly suppresses bending and length reduction during manufacturing and has improved wear resistance. [Means for solving the problem] The present invention uses an austenitic material as the base material,
The build-up weld layer mainly has a chevron-shaped solidified structure in the longitudinal direction, and is a powder build-up weld layer that holds hard particles dispersed in Co-based, Fe-based, or Ni-based alloys, or these alloys, and has valleys. The corrosion-resistant and wear-resistant screw is characterized in that the thickness of the built-up layer is 15% or less of the diameter of the valley. Wear resistance can be imparted to the build-up weld layer by powder build-up using only the above-mentioned alloys, but if higher wear resistance is required depending on the application, hard particles described below are dispersed. If the thickness of the build-up layer exceeds 15% of the diameter of the valley, the bending and longitudinal shrinkage of the screw after build-up welding will increase, so it was limited to 15% or less. The hard particles used in the present invention include WC,
Metal oxides such as TiC, VC, Cr7C3 , nitrides such as TiN, borides such as TiB2 , oxides such as Al2O3 , SiO2 , ZrO2, etc. are suitable. as
Austenitic materials with HB Brinell hardness of HB201 or higher are effective. [Function] Since the screw of the present invention uses an austenitic material with a high coefficient of thermal expansion as the base material for overlay, the amount of thermal expansion at the base material temperature during overlay is larger than that of a ferrite material. It is difficult for tensile stress to remain in the build-up layer when it is cooled after build-up, and the base material has higher high-temperature strength than ferrite-based materials, and the strength in the axial direction of the base material as the build-up layer shrinks when it cools down. The material must have characteristics that can withstand the action of compressive stress along the axial direction and prevent shrinkage of the base material in the axial direction, and can also prevent bending after overlaying. In particular, the room temperature hardness of the base material is determined by Brinell hardness HB201.
By doing so, bending and length reduction can be reduced. The fact that the tensile stress acting on the built-up layer is small means that
This reduces the risk of cracks occurring in the built-up layer, and makes it possible to overlay the overlay material with high hardness, corrosion resistance, and wear resistance on the overlay surface layer, making it possible to provide a higher quality screw. do. Next, the built-up weld layer of the screw of the present invention will be described. The built-up layer of the screw of the present invention is formed by welding, and is fixed to the base metal through a diffusion layer with strong bonding force, so thermal stress is also dispersed by the diffusion layer, resulting in poor peeling resistance. big. This build-up layer is made of a molten powder that allows you to arbitrarily select each component and its blending ratio.
Abrasion resistance can be made sufficiently high. In addition, the solidified structure of the build-up layer of the chevron portion of the screw, which requires the most wear resistance, is a solidified structure that extends in the direction of progress of the build-up, that is, with a component in the longitudinal direction of the chevron. Since the directional component coincides with the direction of friction with the material to be injected, it exhibits particularly high wear resistance. [Example] Table 1 shows examples of combinations of the screw base material and overlay material in the present invention, the hardness of the overlay layer, and comparison results of corrosion resistance and wear resistance with conventional SKD11 as a comparison material. . Table 2 also shows the composition of the alloy used. This data is based on a test piece in which the entire surface of a cubic base material is overlaid with plasma powder.
【表】【table】
【表】【table】
【表】
耐食性については従来の特殊鋼SKD１１のそ
れを100として指数で示した。表１からステライ
ト、Ni基合金、Fe基合金ないしこれと硬質粒子
とを複合で肉盛りした本発明スクリユー材料は、
いずれもSKD１１に対して格段にすぐれた耐食
性を有していることが判る。
一方、耐摩耗性についてもSKD１１の摩耗減
量を100として指数で示したが、本願発明にかか
わるスクリユー用肉盛り合金は耐食性をとくに重
視した抵硬度のNi基合金及びインコロイ800の場
合を除き、格段にすぐれた耐摩耗性を示してい
る。これは、ステライト系合金については、本来
耐摩耗性にすぐれており、またさらに合金によつ
てはこれに硬質炭化物のほかの分散粒子が分布し
ているためである。
硬質粒子の耐摩耗性に与える影響については粒
子の硬さが高く、かつ分散粒子の量の多いものが
耐摩耗性は大きい傾向がある。
次に実際のスクリユーを想定した形状に機械加
工して、螺旋状山形を創成した各オーステナイト
系母材を使用し、谷部肉盛り層の厚さをスクリユ
ー肉盛り母材の谷部直径の15％以下に限定した本
願発明のスクリユーの肉盛り前後の寸法変化、曲
がり発生状況を表３に示す。[Table] Corrosion resistance is expressed as an index with that of the conventional special steel SKD11 as 100. From Table 1, the screw material of the present invention, which is made of stellite, Ni-based alloy, Fe-based alloy, or a composite of these and hard particles, is as follows:
It can be seen that both have significantly better corrosion resistance than SKD11. On the other hand, the wear resistance was also expressed as an index with the wear loss of SKD11 as 100, but the overlay alloys for screws according to the present invention have a significantly higher It shows excellent wear resistance. This is because stellite alloys inherently have excellent wear resistance, and depending on the alloy, dispersed particles other than hard carbides are distributed therein. Regarding the influence of hard particles on abrasion resistance, there is a tendency for particles with higher hardness and a larger amount of dispersed particles to have greater abrasion resistance. Next, each austenitic base material is machined into a shape that simulates the actual screw to create a spiral chevron shape, and the thickness of the valley build-up layer is 15 times the diameter of the valley of the screw build-up base material. Table 3 shows the dimensional changes and bending occurrence before and after the build-up of the screw of the present invention, which was limited to % or less.
以上にのべたように、本発明のスクリユーは、
粉体肉盛りによる耐食、耐摩スクリユーにおい
て、母材にオーステナイト系合金を使用し、かつ
谷部肉盛り層の厚さを、製品状態において母材谷
部径の15％以下に限定することにより、細径で長
さの大きい場合でも肉盛りによる軸方向の収縮量
が小さく、また曲がりも小さいスクリユーの製造
が可能となる。
As stated above, the screw of the present invention is
By using an austenitic alloy as the base material and limiting the thickness of the valley build-up layer to 15% or less of the base metal valley diameter in the product state, the corrosion-resistant and wear-resistant screws are made using powder overlay. Even if the screw has a small diameter and a long length, it is possible to manufacture a screw that has a small amount of shrinkage in the axial direction due to build-up and is also small in bending.
Claims (1)
山形部および該山形部間の谷部に耐食性又は及び
耐摩耗性の肉盛り溶接層を有し、該肉盛り溶接層
は、主に前記山形の長手方向の凝固組織を有する
射出成形機、押出機等用のスクリユーにおいて、
母材はオーステナイト系材料であり、前記肉盛り
溶接層は、Co基の超耐熱合金、Fe基の超耐熱合
金もしくはNi基の超耐熱合金（ただし自溶性合
金を除く）、又はこれ等の合金に硬質粒子を分散
保持する粉体肉盛り溶接層であり、かつ前記谷部
における前記肉盛り溶接層の厚さが該谷部の直径
の15％以下であることを特徴する耐食耐摩スクリ
ユー。 ２ 母材は常温硬さがブリネル硬さHB201以上
であることを特徴とする特許請求の範囲第１項記
載の耐食、耐摩スクリユー。[Scope of Claims] 1. The shaft portion has a spirally connected mountain shape on the outer periphery, and has a corrosion-resistant or wear-resistant built-up welding layer in the mountain-shape portion and the valley between the mountain-shape portions, The built-up weld layer is mainly used in screws for injection molding machines, extruders, etc., which have the solidified structure in the longitudinal direction of the mountain shape.
The base material is an austenitic material, and the build-up weld layer is made of Co-based super heat-resistant alloy, Fe-based super heat-resistant alloy, Ni-based super heat-resistant alloy (excluding self-fusing alloys), or alloys thereof. 1. A corrosion-resistant and wear-resistant screw, characterized in that the screw has a powder build-up weld layer that disperses and retains hard particles, and the thickness of the build-up weld layer at the valley portion is 15% or less of the diameter of the valley portion. 2. The corrosion-resistant and wear-resistant screw according to claim 1, wherein the base material has a hardness at room temperature of Brinell hardness HB201 or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60090336A JPS61248702A (en) | 1985-04-26 | 1985-04-26 | Corrosion-resistant and wear-resistant screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60090336A JPS61248702A (en) | 1985-04-26 | 1985-04-26 | Corrosion-resistant and wear-resistant screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61248702A JPS61248702A (en) | 1986-11-06 |
| JPH0422127B2 true JPH0422127B2 (en) | 1992-04-15 |
Family
ID=13995677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60090336A Granted JPS61248702A (en) | 1985-04-26 | 1985-04-26 | Corrosion-resistant and wear-resistant screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61248702A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934343A1 (en) * | 1999-07-22 | 2001-01-25 | Arenz Gmbh | Screw flight to minimize wear in e.g. plastic extruders and plasticizing machines, includes alternating series of hard metal wear-protection regions and tough metal stress-relief regions along its flights |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925941A (en) * | 1982-08-02 | 1984-02-10 | Mitsubishi Metal Corp | Cylinder and screw member for injection molding machine and extruder for plastic material and its production |
| JPS59143061A (en) * | 1983-02-07 | 1984-08-16 | Mitsubishi Heavy Ind Ltd | Surface treatment of screw |
-
1985
- 1985-04-26 JP JP60090336A patent/JPS61248702A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925941A (en) * | 1982-08-02 | 1984-02-10 | Mitsubishi Metal Corp | Cylinder and screw member for injection molding machine and extruder for plastic material and its production |
| JPS59143061A (en) * | 1983-02-07 | 1984-08-16 | Mitsubishi Heavy Ind Ltd | Surface treatment of screw |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61248702A (en) | 1986-11-06 |
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