JP2520382B2 - Method of forming wear resistant structure in sliding part of injection molding machine - Google Patents
Method of forming wear resistant structure in sliding part of injection molding machineInfo
- Publication number
- JP2520382B2 JP2520382B2 JP63222699A JP22269988A JP2520382B2 JP 2520382 B2 JP2520382 B2 JP 2520382B2 JP 63222699 A JP63222699 A JP 63222699A JP 22269988 A JP22269988 A JP 22269988A JP 2520382 B2 JP2520382 B2 JP 2520382B2
- Authority
- JP
- Japan
- Prior art keywords
- tungsten carbide
- layer
- nickel alloy
- wear resistant
- injection molding
- 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
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
- B29C45/58—Details
- B29C45/60—Screws
-
- 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
- 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
- B29C48/509—Materials, coating or lining therefor
-
- 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
-
- 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)
- Injection Moulding Of Plastics Or The Like (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、射出成形装置において摩耗の生じやすい
摺動部における耐摩耗構造の形成方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for forming a wear-resistant structure in a sliding portion where wear easily occurs in an injection molding apparatus.
（従来の技術） 射出成形装置においては、例えば、成形材料のチャー
ジ時にリングバルブの前端面とスクリュヘッド後端面が
接触しかつ前記スクリュヘッドが回転しているため摺動
し、両者の摺動面には摩擦による摩耗が生ずる。特に、
成形材料がセラミック等の硬質材料である場合あるいは
ガラスフィラー等を混入した場合には、両部品の摺動部
における摩耗は著しく、そのためクスリュの寿命が極端
に短くなるという問題を生じている。(Prior Art) In an injection molding apparatus, for example, when the molding material is charged, the front end surface of the ring valve and the rear end surface of the screw head are in contact with each other, and the screw head is rotating, so that the sliding surfaces slide. Wear due to friction occurs. In particular,
When the molding material is a hard material such as ceramics, or when glass filler or the like is mixed, the sliding parts of both parts are significantly worn, which causes a problem that the life of the screw is extremely shortened.
このような問題を解決する手段として、例えば特開昭
62−68703号公報に開示されたように、両部品の接触面
に硬質粉粒体であるタングステンカーバイドを適量溶射
することによって摩耗防止を図る構造が提案されてい
る。As means for solving such a problem, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Laid-Open No. 62-68703, there has been proposed a structure for preventing wear by spraying an appropriate amount of tungsten carbide which is a hard powder on the contact surfaces of both parts.
ところで、このタングステンカーバイドは、耐熱、耐
摩耗性を有するニッケル合金とともにプラズマ溶射法に
よって溶射されるのが好ましい。しかしながら、これら
の金属パウダーを混合溶射した場合には、次のような問
題が生ずることが明らかになった。By the way, this tungsten carbide is preferably sprayed by a plasma spraying method together with a nickel alloy having heat resistance and wear resistance. However, it became clear that the following problems occur when these metal powders are mixed and sprayed.
すなわち、タングステンカーバイドパウダーとニッケ
ル合金パウダーを混合溶射した場合、タングステンカー
バイドの比重15.8に対しニッケル合金の比重が大きく異
なる（例えば後述する実施例のニッケル合金パウダー
「Nimonic80A」（商品名）の比重は4.63）ために、第３
図に示した溶着層40の拡大断面図から明らかなように、
比重の大きいタングステンカーバイド41がニッケル合金
42中に沈み込んで被溶射体である母材43表面側に集中
し、溶着層上部にタングステンカーバイドがほとんど存
在せず均一な溶着層が得られないのである。従って、こ
のような溶着層40にあっては層の上部と下部とで硬度が
異なり所定の強度の耐摩耗層が得られない。That is, when the tungsten carbide powder and the nickel alloy powder are mixed and sprayed, the specific gravity of the nickel alloy is greatly different with respect to the specific gravity of 15.8 of the tungsten carbide (for example, the specific gravity of the nickel alloy powder “Nimonic 80A” (trade name) in the example described later is 4.63). ) For the third
As is clear from the enlarged cross-sectional view of the welding layer 40 shown in the figure,
Tungsten carbide 41 with a large specific gravity is a nickel alloy
This is because it sinks into 42 and concentrates on the surface side of the base material 43 which is the object to be sprayed, and there is almost no tungsten carbide on the upper part of the welding layer, so that a uniform welding layer cannot be obtained. Therefore, in such a welded layer 40, the hardness is different between the upper part and the lower part of the layer, and a wear resistant layer having a predetermined strength cannot be obtained.
（発明が解決しようとする課題） そこでこの発明は上のような状況に鑑みて、層の上部
と下部とで硬度等の物性が異なることがなく、所定の混
合比に基づく強度を有し、耐摩耗性、耐久性に優れた耐
摩耗構造を確実に形成する方法を提供することを目的と
するものである。(Problems to be solved by the invention) Therefore, in view of the above situation, the present invention does not have different physical properties such as hardness between the upper part and the lower part of the layer, and has strength based on a predetermined mixing ratio, It is an object of the present invention to provide a method for surely forming a wear resistant structure having excellent wear resistance and durability.
（課題を解決するための手段） すなわち、この発明は、耐摩耗構造の形成方法に係
り、この方法は、摺動部の母材表面に、ニッケル合金パ
ウダーとタングステンカーバイドパウダーを混合溶着し
て基体層を形成する工程と、前記基体層にタングステン
カーバイドパウダーを溶着してニッケル合金とタンング
ステンカーバイドがほぼ均一な状態で分散された耐摩耗
層を形成する工程とからなることを特徴とする。(Means for Solving the Problems) That is, the present invention relates to a method for forming a wear-resistant structure, and this method comprises mixing and welding nickel alloy powder and tungsten carbide powder on the surface of a base material of a sliding portion to form a substrate. It is characterized by comprising a step of forming a layer and a step of depositing a tungsten carbide powder on the base layer to form a wear resistant layer in which a nickel alloy and tonguesten carbide are dispersed in a substantially uniform state.
（実施例） 以下添付の図面に従ってこの発明の実施例を説明する
と、第１図はスクリュヘッドとリングバルブの摺動部に
耐摩耗層を形成した射出成形装置の要部断面図、第２図
は第１図の耐摩耗層の拡大断面図、第３図は従来の溶着
層の拡大断面図、第４図はこの発明方法の基体層の形成
工程を示す断面図、第５図は同じく耐摩耗層の形成工程
を示す断面図である。(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of an essential part of an injection molding apparatus in which a wear resistant layer is formed on a sliding portion of a screw head and a ring valve, and FIG. 1 is an enlarged sectional view of the wear-resistant layer of FIG. 1, FIG. 3 is an enlarged sectional view of a conventional welding layer, FIG. 4 is a sectional view showing a step of forming a base layer in the method of the present invention, and FIG. It is sectional drawing which shows the formation process of a wear layer.
第１図に図示したように射出成形装置の加熱筒11内に
はスクリュ12が回転自在に挿入され、このスクリュ先端
にはウエアプレート13を介してスクリュヘッド20が螺着
されている。スクリュヘッド20は溶融した成形材料を通
過させるための切欠通路23がもうけられた大径部21およ
びスクリュに螺着される細軸部22を有する。また細軸部
22の外周には加熱筒11内面に当接するリングバルブ30が
嵌挿され、該リングバルブ内周面31と前記細軸部22との
間には樹脂通路Ｐとなる間隙が形成される。As shown in FIG. 1, a screw 12 is rotatably inserted into a heating cylinder 11 of an injection molding apparatus, and a screw head 20 is screwed to a tip of the screw via a wear plate 13. The screw head 20 has a large-diameter portion 21 provided with a notch passage 23 for passing a molten molding material and a thin shaft portion 22 screwed to the screw. Also thin shaft
A ring valve 30 that abuts the inner surface of the heating cylinder 11 is fitted around the outer periphery of the heating cylinder 11, and a gap serving as a resin passage P is formed between the inner peripheral surface 31 of the ring valve and the thin shaft portion 22.
そして溶融樹脂のチヤージ（充填）時には、樹脂の搬
送圧によってリングバルブ30が前方に押されて該リング
バルブ後端部32と前記ウエアプレート13の前端部13aの
間に隙間が形成され、樹脂通路Ｐが開かれて切欠通路23
と連通する。When the molten resin is charged (filled), the ring valve 30 is pushed forward by the conveying pressure of the resin to form a gap between the ring valve rear end portion 32 and the wear plate 13 front end portion 13a. P is opened and notched passage 23
Communicate with
このとき前記リングバルブの前端部33とスクリュヘッ
ドの大径部後端面21aは接触しており、同時にスクリュ1
2が回転しているのでこれらの摺動部における摩耗は極
めて大きいものとなる。At this time, the front end portion 33 of the ring valve and the rear end surface 21a of the large diameter portion of the screw head are in contact with each other, and at the same time, the screw 1
Since 2 is rotating, the wear at these sliding parts is extremely large.
しかるに、この射出成形装置においては、摺動部とな
るスクリュヘッド大径部の後端面21aおよびリングバル
ブの前端面33に、それぞれ耐摩耗層10,10が形成されて
いる。However, in this injection molding apparatus, the wear resistant layers 10 and 10 are formed on the rear end surface 21a of the screw head large-diameter portion which is the sliding portion and the front end surface 33 of the ring valve, respectively.
この耐摩耗層10の厚さは約4mmで、ニッケル合金とタ
ングステンカーバイドの金属パウダーのプラズマ溶着層
からなる。The wear-resistant layer 10 has a thickness of about 4 mm and is composed of a plasma-welded layer of nickel alloy and metal powder of tungsten carbide.
そしてこの耐摩耗層10は、第２図の拡大断面図から理
解されるように、スクリュヘッドまたはリングバルブを
構成する母材Ｓ表面に、ニッケル合金14とタングステン
カーバイド15がほぼ均一に分散された状態で溶着形成さ
れている。As can be seen from the enlarged cross-sectional view of FIG. 2, the wear-resistant layer 10 has a nickel alloy 14 and a tungsten carbide 15 dispersed almost uniformly on the surface of the base material S that constitutes the screw head or the ring valve. It is welded and formed.
第３図は従来の耐摩耗構造における断面図であるが、
前述したように、従来構造の耐摩耗層40にあっては両金
属パウダーの比重の違いにより比重の大きいタングステ
ンカーバイド41は比重の小さいニッケル合金42の下部に
沈み込み、均一な分散混合状態が得られない。FIG. 3 is a sectional view of a conventional wear resistant structure,
As described above, in the wear-resistant layer 40 having the conventional structure, the tungsten carbide 41 having a large specific gravity sinks under the nickel alloy 42 having a small specific gravity due to the difference in the specific gravity of both metal powders, and a uniform dispersed mixed state is obtained. I can't.
この耐摩耗層10は以下に述べる方法によって形成され
る。The wear resistant layer 10 is formed by the method described below.
まず、第４図に図示したように、摺動部となるリング
バルブの前端面またはスクリュヘッド大径部の後端面等
の母材Ｓの表面に、ニッケル合金とタングステンカーバ
イド（WC）のパウダーを、混合比、例えば体積比で〔ニ
ッケル合金パウダー〕７対〔タングステンカーバイドパ
ウダー〕３の割合で公知のプラズマ溶着装置50より混合
溶着して基体層10Aが形成される。First, as shown in FIG. 4, nickel alloy and tungsten carbide (WC) powder are applied to the surface of the base material S such as the front end surface of the ring valve or the rear end surface of the screw head large diameter portion, which is the sliding portion. The base layer 10A is formed by mixing and welding with a known plasma welding apparatus 50 in a mixing ratio, for example, a volume ratio of [nickel alloy powder] 7 to [tungsten carbide powder] 3.
実施例では、ニッケル合金パウダーとして「Nimonic8
0A」（商品名）を用いた。このニッケル合金パウダーの
成分は、重量％で、ニッケル（Ni）74.9、クロム（Cr）
20％、チタン（Ti）2.5％、アルミニウム（Al）1.6％、
その他１％で、その見掛密度は4.63g/cm3である。In the example, as a nickel alloy powder, "Nimonic 8
0A ”(trade name) was used. The components of this nickel alloy powder are nickel (Ni) 74.9 and chromium (Cr) in weight%.
20%, titanium (Ti) 2.5%, aluminum (Al) 1.6%,
At 1%, the apparent density is 4.63 g / cm 3 .
なお、ニッケル合金とタングステンカーバイド（WC）
のパウダーを混合しているのは、タングステンカーバイ
ドだけでは硬すぎて脆くなり加工が困難だからである。In addition, nickel alloy and tungsten carbide (WC)
The reason why the powder of (3) is mixed is that tungsten carbide alone is too hard and brittle and difficult to process.
ここで形成される基体層10Aでは、図示のように、比
重の相違により、タングステンカーバイド15は基体層10
A下部に沈みこみ、上部はほとんどニッケル合金14のみ
の層となっている。これは、第３図に図示した従来の溶
着層40と同様である。In the base layer 10A formed here, as shown in the drawing, due to the difference in specific gravity, the tungsten carbide 15 becomes the base layer 10A.
It sank in the lower part of A, and the upper part was almost a layer of only nickel alloy 14. This is similar to the conventional welding layer 40 shown in FIG.
次に、この発明方法においては、第５図に図示したよ
うに、前記工程で形成された基体層10Aにタングステン
カーバイド（WC）が前記と同様プラズマ溶着装置50によ
って溶着される。このときのタングステンカーバイドパ
ウダーの溶着量は、前記基体層の形成工程で溶着された
タングステンカーバイドパウダーと同量で行うことが望
ましい。Next, in the method of the present invention, as shown in FIG. 5, tungsten carbide (WC) is deposited on the base layer 10A formed in the above step by the plasma deposition apparatus 50 as described above. The amount of tungsten carbide powder deposited at this time is preferably the same as the amount of tungsten carbide powder deposited in the step of forming the base layer.
この工程によって、図示のように、タングステンカー
バイド15は前記基体層10Aの上部、すなわちタングステ
ンカーバイドがほとんど存在していなかったニッケル合
金14中にも入り込み、全体としてタングステンカーバイ
ド15がニッケル合金14中にほぼ均一な状態で分散された
耐摩耗層10が形成される。By this step, as shown in the drawing, the tungsten carbide 15 also penetrates into the upper portion of the base layer 10A, that is, into the nickel alloy 14 in which the tungsten carbide was almost absent, and the tungsten carbide 15 is almost entirely contained in the nickel alloy 14. The wear resistant layer 10 dispersed in a uniform state is formed.
（効 果） 以上図示し説明したようにこの発明によれば、射出成
形装置の摺動部の母材表面にニッケル合金とタングステ
ンカーバイドがほぼ均一な状態で分散された耐摩耗層を
簡単かつ確実に溶着形成することが可能となった。従っ
て層全体に所定の混合比よりなる金属層が形成され、所
期の硬度を有し、かつ耐摩耗性、耐久性等の物性を安定
して備えた耐摩耗層を形成することができ、この発明の
もたらす効果は実際上極めて大きいものがある。(Effect) As shown and described above, according to the present invention, a wear-resistant layer in which a nickel alloy and tungsten carbide are dispersed in a substantially uniform state can be easily and reliably formed on the surface of the base material of the sliding portion of the injection molding device. It has become possible to form a welded joint. Therefore, a metal layer having a predetermined mixing ratio is formed on the whole layer, and it is possible to form a wear-resistant layer having desired hardness and having stable physical properties such as wear resistance and durability. The effect of the present invention is extremely large in practice.
第１図はスクリュヘッドとリングバルブの摺動部に耐摩
耗層を形成した射出成形装置の要部断面図、第２図は第
１図の耐摩耗層の拡大断面図、第３図は従来の溶着層の
拡大断面図、第４図はこの発明方法の基体層の形成工程
を示す断面図、第５図は同じく耐摩耗層の形成工程を示
す断面図である。 10……耐摩耗層、10A……基体層、14……ニッケル合
金、15……タングステンカーバイド、20……スクリュヘ
ッド、21a……大径部後端面、30……リングバルブ、33
……リングバルブ前端面。FIG. 1 is a sectional view of an essential part of an injection molding apparatus in which a wear resistant layer is formed on a sliding portion of a screw head and a ring valve, FIG. 2 is an enlarged cross sectional view of the wear resistant layer of FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view of the welding layer of FIG. 4, FIG. 4 is a cross-sectional view showing a base layer forming step of the method of the present invention, and FIG. 10 ... Wear resistant layer, 10A ... Base layer, 14 ... Nickel alloy, 15 ... Tungsten carbide, 20 ... Screw head, 21a ... Large diameter rear end face, 30 ... Ring valve, 33
...... Front end face of the ring valve.
フロントページの続き (56)参考文献 特開 昭57−158367（ＪＰ，Ａ) 特開 昭55−58360（ＪＰ，Ａ) 特開 平２−8359（ＪＰ，Ａ) 特開 昭61−201701（ＪＰ，Ａ) 特表 昭60−500627（ＪＰ，Ａ)Continuation of the front page (56) References JP 57-158367 (JP, A) JP 55-58360 (JP, A) JP 2-8359 (JP, A) JP 61-201701 (JP , A) Special table Sho 60-500627 (JP, A)
Claims (2)
ーとタングステンカーバイドパウダーを混合溶着して基
体層を形成する工程と、前記基体層にタングステンカー
バイドパウダーを溶着してニッケル合金とタンングステ
ンカーバイドがほぼ均一な状態で分散された耐摩耗層を
形成する工程とからなること特徴とする射出成形装置の
摺動部における耐摩耗構造の形成方法。1. A step of forming a base layer by mixing and welding a nickel alloy powder and a tungsten carbide powder on the surface of a base material of a sliding portion; and a step of welding the tungsten carbide powder to the base layer to deposit a nickel alloy and a tungsten alloy. A method of forming a wear resistant structure in a sliding portion of an injection molding apparatus, which comprises a step of forming a wear resistant layer in which carbide is dispersed in a substantially uniform state.
ダーとタングステンカーバイドパウダーの混合比が体積
比で約７対３の割合である請求項第１項記載の射出成形
装置の摺動部における耐摩耗構造の形成方法。2. A wear resistant structure in a sliding portion of an injection molding apparatus according to claim 1, wherein the mixing ratio of the nickel alloy powder and the tungsten carbide powder in the base layer forming step is about 7: 3 by volume. Forming method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222699A JP2520382B2 (en) | 1988-09-06 | 1988-09-06 | Method of forming wear resistant structure in sliding part of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222699A JP2520382B2 (en) | 1988-09-06 | 1988-09-06 | Method of forming wear resistant structure in sliding part of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0270051A JPH0270051A (en) | 1990-03-08 |
| JP2520382B2 true JP2520382B2 (en) | 1996-07-31 |
Family
ID=16786529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63222699A Expired - Lifetime JP2520382B2 (en) | 1988-09-06 | 1988-09-06 | Method of forming wear resistant structure in sliding part of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520382B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2535920Y2 (en) * | 1992-10-23 | 1997-05-14 | 株式会社名機製作所 | Screw head structure of injection device |
| JPH0860334A (en) * | 1995-08-03 | 1996-03-05 | Meiki Co Ltd | Manufacture of nozzle tip of injection molding machine |
| JP4820162B2 (en) * | 2005-12-15 | 2011-11-24 | スパイラル ロジック エルティディ | Screw, injection device and pressure member |
| JP5808648B2 (en) * | 2010-11-18 | 2015-11-10 | 住友重機械工業株式会社 | Screw manufacturing method and screw |
| CN114855159A (en) * | 2022-04-15 | 2022-08-05 | 潜江市江汉钻具有限公司 | Wear-resistant double-layer composite drill bit based on plasma fusion and preparation method thereof |
-
1988
- 1988-09-06 JP JP63222699A patent/JP2520382B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0270051A (en) | 1990-03-08 |
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