JPS583806B2 - Surface strengthening treatment method for plastic molds - Google Patents
Surface strengthening treatment method for plastic moldsInfo
- Publication number
- JPS583806B2 JPS583806B2 JP50066905A JP6690575A JPS583806B2 JP S583806 B2 JPS583806 B2 JP S583806B2 JP 50066905 A JP50066905 A JP 50066905A JP 6690575 A JP6690575 A JP 6690575A JP S583806 B2 JPS583806 B2 JP S583806B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- strengthening treatment
- nitrogen
- gas
- treatment method
- 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
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明はプラスチック成形金型の表面を強化する方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of reinforcing the surface of a plastic mold.
近時、ＡＢＳ樹脂の発泡成形、塩化ビニール系樹脂、ガ
ラス繊維を含む樹脂、難燃性樹脂の射出成形が行なわれ
る様になったが、これ等樹脂は成形時に弱酸又はアルカ
リ性のガスを発生して金型表面を腐蝕したり、ガラス繊
維が金型表面に微細な傷を付け、金型の損傷を早める問
題が生じている。In recent years, foam molding of ABS resin, vinyl chloride resin, resin containing glass fiber, and injection molding of flame-retardant resin have become popular, but these resins generate weak acid or alkaline gas during molding. The problem is that the glass fibers corrode the surface of the mold, and the glass fibers cause minute scratches on the surface of the mold, accelerating damage to the mold.
そのため金型表面に厚いクロームメッキを施すことによ
り上記問題の解決を行なっているが、クロームメッキは
金型の精度を阻害し、又メツキ層はメッキ処理の特性で
凹部又は凸部のエッジ部に特に厚く形成されるため、金
型で成形した時メッキ層がアンダーカットになり、円滑
な型の開閉を妨げる欠点があった。Therefore, the above problem has been solved by applying thick chrome plating to the mold surface, but chrome plating hinders the precision of the mold, and due to the characteristics of the plating process, the plating layer does not cover the edges of concave or convex parts. Because it is particularly thick, the plating layer becomes undercut when molded, which prevents the mold from opening and closing smoothly.
金属表面の強化方法として一般には窒化処理が考えられ
る。Nitriding treatment is generally considered as a method for strengthening metal surfaces.
しかしガス窒化法によって強化処理をする場合、金型を
大気中で急激に温度上昇して高温に熱するため、金型に
反り変形歪を生じ、表面にポーラスを形成し、このポー
ラスの処理加工に手間を要するだめ、金型の表面処理に
は不向きである。However, when strengthening by gas nitriding, the temperature of the mold increases rapidly in the atmosphere and is heated to a high temperature, which causes warping and deformation of the mold, forming porosity on the surface, and processing of this porosity. It is not suitable for surface treatment of molds because it requires a lot of effort.
又塩浴窒化法では窒素の拡散が浅いだめ十分な強化層が
得られない不利がある。Furthermore, the salt bath nitriding method has the disadvantage that a sufficient reinforcing layer cannot be obtained because the nitrogen diffusion is shallow.
しかもガス窒化法ではアンモニア分解ガスを発生し、塩
浴窒化法ではシアン化物が使われるだめ公害問題を起す
欠点があった。Moreover, the gas nitriding method generates ammonia decomposition gas, and the salt bath nitriding method uses cyanide, which causes pollution problems.
本発明はプラスチック成形用金型に対し、特にイオン化
した窒素ガス分子の衝撃を加える事により深い窒化層を
形成すると共に従来の公害問題は全く起らず、小型の設
備によって簡易に実施できる金型表面の強化処理方法を
明らかにするものである。The present invention forms a deep nitrided layer on plastic molding molds by applying the impact of ionized nitrogen gas molecules, does not cause any of the conventional pollution problems, and can be easily implemented using small equipment. This study clarifies the surface strengthening treatment method.
図面は本発明の実施状況を示すものであって、密閉炉１
中の陰極架３に処理すべき金型２を懸け吊し又は据え置
き、炉１を真空装置４により１〜１０ｍｍＨｇに減圧す
る。The drawings show the state of implementation of the present invention, and show a closed furnace 1.
The mold 2 to be processed is hung or placed on the cathode rack 3 inside, and the pressure of the furnace 1 is reduced to 1 to 10 mmHg by the vacuum device 4.
ガス圧力検出手段８によってガスボンベ７の弁を制御し
つつ開いて、窒化ガスあるいは窒化ガスと水素ガスもし
くはアルゴンガスとの混合ガスを注入し、１〜２０ｍｉ
Ｈｇの低圧に保つ。The valve of the gas cylinder 7 is opened while being controlled by the gas pressure detection means 8, and nitriding gas or a mixed gas of nitriding gas and hydrogen gas or argon gas is injected.
Maintain low pressure of Hg.
又電源５に対し密閉炉１の水冷された炉壁６を陽極、陰
極架３を陰極にして直流電位差３００〜１０００Ｖを印
加して２ＯＡ程度を通じると、金型２にグロー放電を起
し、雰囲気中の窒素は陰極近くでイオン化されて陽イオ
ンとなり金型２表面に衝突する。Further, when a DC potential difference of 300 to 1000 V is applied to the power source 5 with the water-cooled furnace wall 6 of the closed furnace 1 as the anode and the cathode frame 3 as the cathode, and a current of about 2 OA is applied, a glow discharge is caused in the mold 2. Nitrogen in the atmosphere is ionized near the cathode to become positive ions and collide with the surface of the mold 2.
この衝撃エネルギーにより金型表面を５００〜６００℃
に熱すると同時に窒素分子が金型表面に浸透拡散して窒
化鉄の層を表面に形成するのである。This impact energy heats the mold surface to 500-600℃.
At the same time as heating, nitrogen molecules permeate and diffuse into the mold surface, forming a layer of iron nitride on the surface.
窒化処理時間は処理すべき金型の大きさによって異なる
が例えば５ ０ ０ｍｍ× ５ ０ ０ｍｍ程度の寸法
であれば約１０時間グロー放電を持続する事により窒化
イオンは金属結晶間に拡散して繊密な窒化鉄の層を形成
し、いわゆる窒素効果が得られ、層の厚さは最大０．８
５ｍｍ位に達する。The nitriding treatment time varies depending on the size of the mold to be treated, but for example, if the size is about 500 mm x 500 mm, by continuing the glow discharge for about 10 hours, the nitriding ions will diffuse between the metal crystals and form the fibers. Forms a dense iron nitride layer, resulting in the so-called nitrogen effect, and the layer thickness is up to 0.8
It reaches about 5mm.
上記イオン窒化処理を行なって後、金型に対し３〜５μ
程度のうすいクロームメッキを施せば耐蝕性を一層向上
して、金型の寿命をのばす事ができる。After performing the above ion nitriding treatment, 3 to 5 μm is applied to the mold.
Applying a light chrome plating can further improve corrosion resistance and extend the life of the mold.
本発明は上記のごとしプラスチック成形金型の表面に対
しイオン窒化処理を施したから、従来のクロームメッキ
などの表面処理に比べて金型表面に異常なメッキ***は
起らず、又金属材料の変態点を越えない程度の加熱で表
面に窒化効果による窒化鉄の層を形成するだけであるか
ら、金型の精度が狂う事がなく、円滑な金型の開閉をな
し得る特徴がある。In the present invention, since the surface of the plastic mold is subjected to ion nitriding treatment as described above, abnormal plating protrusions do not occur on the mold surface compared to conventional surface treatments such as chrome plating, and the metal material Since a layer of iron nitride is simply formed on the surface due to the nitriding effect by heating to a level that does not exceed the transformation point of , the accuracy of the mold is not lost and the mold can be opened and closed smoothly.
しかもプラスチック材料の射出成形に際して弱酸又はア
ルカリ性ガスの発生あるいはガラス繊維の混入があって
も金型表面の繊密な窒化層によって腐蝕及びきずつきが
防止され、金型の寿命が延長できるなと、多くの利点が
発揮される。Moreover, even if weak acid or alkaline gas is generated or glass fiber is mixed in during injection molding of plastic materials, the delicate nitrided layer on the mold surface prevents corrosion and scratches, extending the life of the mold. Many advantages are demonstrated.
又イオン化した窒素の金型への衝撃エネルギーにより金
型表面の加熱を行なうから、特別な加熱装置や温度制御
装置等必要とせず、小形の密閉炉１と直流電源５、真空
装置４によって簡易に実施できる。In addition, since the mold surface is heated by the impact energy of ionized nitrogen on the mold, there is no need for special heating equipment or temperature control equipment, and the process can be easily performed using a small closed furnace 1, a DC power source 5, and a vacuum device 4. Can be implemented.
更に本発明は窒素供給源として不活性の窒素ガスを用い
ているから、取扱や操作に危険がなく、又公害問題を起
すおそれは全くない。Furthermore, since the present invention uses inert nitrogen gas as the nitrogen supply source, there is no danger in handling or operation, and there is no risk of causing pollution problems.
而も窒素ガスの供給量を直接制御できるから、形成する
窒化層の性質を自由に変えることができ、又該窒化層は
不純物の少ない単一組織層で形成されるから、ポーラス
等の発生がない高硬度の硬化面が得られるなど、すぐれ
た効果を有するものである。Moreover, since the amount of nitrogen gas supplied can be directly controlled, the properties of the nitrided layer to be formed can be freely changed, and since the nitrided layer is formed as a single layer with few impurities, the occurrence of porosity etc. can be avoided. It has excellent effects such as obtaining a hardened surface with high hardness.
図面は本発明の実施状況を示す密閉炉の断面図である。
１・・・密閉炉、２・・・金型、３・・・陰極架、４・
・・真空装置、５・・・電源、７・・・ガスボンベ。The drawing is a sectional view of a closed furnace showing the implementation status of the present invention. 1... Closed furnace, 2... Mold, 3... Cathode frame, 4...
...Vacuum device, 5...Power source, 7...Gas cylinder.
Claims (1)
置き、該金型を陰極にして陽極との間にグロー放電を行
なわせて陽イオン化した窒素を金型表面へ衝突させ、こ
の衝突エネルギーにより金型表面を加熱すると同時に該
熱によって窒素分子を金型表面に侵透拡散して窒化鉄の
層を形成することを特徴とするプラスチック成形金型の
表面強化処理方法。1. Place a plastic molding mold in a low-pressure nitrogen gas atmosphere, use the mold as a cathode, and create a glow discharge between it and the anode to cause cationized nitrogen to collide with the mold surface, and the collision energy causes the metal to explode. A method for surface strengthening treatment of a plastic mold, characterized by heating the mold surface and at the same time using the heat, nitrogen molecules permeate and diffuse into the mold surface to form an iron nitride layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50066905A JPS583806B2 (en) | 1975-06-02 | 1975-06-02 | Surface strengthening treatment method for plastic molds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50066905A JPS583806B2 (en) | 1975-06-02 | 1975-06-02 | Surface strengthening treatment method for plastic molds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51142061A JPS51142061A (en) | 1976-12-07 |
| JPS583806B2 true JPS583806B2 (en) | 1983-01-22 |
Family
ID=13329421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50066905A Expired JPS583806B2 (en) | 1975-06-02 | 1975-06-02 | Surface strengthening treatment method for plastic molds |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS583806B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS616806Y2 (en) * | 1983-02-24 | 1986-03-01 | ||
| JPH0446803U (en) * | 1990-08-29 | 1992-04-21 | ||
| JPH0515444B2 (en) * | 1987-05-27 | 1993-03-01 | Kooen Eri |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110496870A (en) * | 2019-07-16 | 2019-11-26 | 昆明理工大学 | A kind of vertical extruder metal die cylinder ejector mechanism and its extrusion method |
-
1975
- 1975-06-02 JP JP50066905A patent/JPS583806B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS616806Y2 (en) * | 1983-02-24 | 1986-03-01 | ||
| JPH0515444B2 (en) * | 1987-05-27 | 1993-03-01 | Kooen Eri | |
| JPH0446803U (en) * | 1990-08-29 | 1992-04-21 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51142061A (en) | 1976-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2011235318A (en) | Method for surface treatment of die-casting die | |
| US4309227A (en) | Ion-nitriding process | |
| JP3185015B2 (en) | Method and apparatus for forming a corrosion and wear protection layer on an iron-based material | |
| JPS583806B2 (en) | Surface strengthening treatment method for plastic molds | |
| DK1097960T3 (en) | Process for chemically modifying the surface properties of a polymer article | |
| JP2010229463A (en) | Member coated with hard film and method for manufacturing the same | |
| JPS55125267A (en) | Surface treating method of improving abrasion resistance and corrosion resistance of iron and steel | |
| JP2002060845A (en) | Method for prolonging service life of die casting die | |
| JP3157943B2 (en) | Method and apparatus for modifying surface of substrate | |
| JP5824010B2 (en) | Hard coating coated member | |
| US3616383A (en) | Method of ionitriding objects made of high-alloyed particularly stainless iron and steel | |
| KR20170052457A (en) | Low-Temperature Vacuum Carburizing Method | |
| US3140205A (en) | Process for nitriding steels of the low, medium and high alloy types by first removing the passive oxide surface film | |
| US1837256A (en) | Process of case hardening | |
| KR100594998B1 (en) | Method for nitriding of Ti and Ti alloy | |
| Xu et al. | Plasma surface alloying | |
| JP2000096208A (en) | Golf club member made of titanium and its hardening treatment | |
| FR2332336A1 (en) | Furnace for ion implantation in metals - suitable for nitriding, carburizing and other treatments | |
| JPH073470A (en) | Surface treatment of aluminum mold for injection molding and device therefor | |
| JPS5735621A (en) | Heat treatment installation for metal | |
| FR2446327A1 (en) | Internal nitriding and/or carburising of gun or extruder barrels - by thermochemical ion bombardment after creating uniform electric field | |
| JP3314812B2 (en) | Ion nitriding method of metal surface using glow discharge | |
| JP2593011B2 (en) | Method of manufacturing hard film-coated metal member | |
| US3256818A (en) | Method of reducing barrel wear | |
| GB965710A (en) | Process for the production of beryllium having increased ductility at high temperatures |