JP3267566B2 - Method of carburizing and hardening the internal thread of a plastic injection molding machine screw - Google Patents
Method of carburizing and hardening the internal thread of a plastic injection molding machine screwInfo
- Publication number
- JP3267566B2 JP3267566B2 JP28017698A JP28017698A JP3267566B2 JP 3267566 B2 JP3267566 B2 JP 3267566B2 JP 28017698 A JP28017698 A JP 28017698A JP 28017698 A JP28017698 A JP 28017698A JP 3267566 B2 JP3267566 B2 JP 3267566B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- carburizing
- injection molding
- molding machine
- hardening
- 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 - Fee Related
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プラスチック用射
出成形機のスクリュに係り、特に、スクリュの先端に形
成された雌ネジ部の疲労強度を改善するための方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw for an injection molding machine for plastics, and more particularly to a method for improving the fatigue strength of a female screw formed at the tip of the screw.
【０００２】[0002]
【従来の技術】図４に、プラスチック用射出成形機のス
クリュの概要を示す。図５に、スクリュ先端部の部分拡
大断面図を示す。スクリュ１の先端部には、スクリュチ
ップ（図示せず）を締結するために雌ネジ部２が形成さ
れている。射出成形の際、この雌ネジ部２には引張りの
繰返し応力が作用する。これによって、スクリュ１は、
その先端部において、ネジの谷底部を起点にして疲労破
壊を生じ易い。2. Description of the Related Art FIG. 4 shows an outline of a screw of an injection molding machine for plastics. FIG. 5 shows a partially enlarged sectional view of the screw tip. A female screw 2 is formed at the tip of the screw 1 to fasten a screw tip (not shown). At the time of injection molding, a repeated tensile stress acts on the female screw portion 2. Thereby, the screw 1
At the tip, fatigue fracture is likely to occur starting from the root of the screw.
【０００３】従来、この様なスクリュ１の疲労破壊を防
止するため、雌ネジ部２に生ずる応力集中を緩和する対
策、即ち、（ａ）ネジ形状を台形ネジにする、（ｂ）雌
ネジの切り上がり部に逃がし３（図５参照）を設けるな
どの対策が取られていた。しかし、これらの対策に基づ
く疲労強度の改善効果は、せいぜい２０％程度であっ
た。Conventionally, in order to prevent such fatigue failure of the screw 1, measures to alleviate the stress concentration occurring in the female screw portion 2, that is, (a) the screw shape is a trapezoidal screw, Countermeasures such as providing a relief 3 (see FIG. 5) in the cut-up portion have been taken. However, the effect of improving the fatigue strength based on these measures was at most about 20%.
【０００４】また、雌ネジ部の表層に、窒化あるいはガ
ス浸炭などによって硬化処理を施すことも試みられてい
る。しかし、窒化処理の場合には、スクリュチップを締
結する際に窒化層にクラックが入り易く、疲労強度改善
の効果が得られにくい。他方、ガス浸炭処理の場合に
は、ガス浸炭炉内でスクリュが９００〜９５０℃程度の
高温に曝されるので、スクリュの変形が大きい。従っ
て、ガス浸炭処理は、仕上げ加工後のスクリュの硬化処
理としては適当ではない。Attempts have also been made to apply a hardening treatment to the surface layer of the female screw portion by nitriding or gas carburizing. However, in the case of the nitriding treatment, when the screw tip is fastened, the nitride layer is easily cracked, and it is difficult to obtain the effect of improving the fatigue strength. On the other hand, in the case of gas carburizing, the screw is exposed to a high temperature of about 900 to 950 ° C. in the gas carburizing furnace, so that the screw is greatly deformed. Therefore, the gas carburizing treatment is not suitable as a hardening treatment of the screw after finishing.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記の様な
従来のプラスチック用射出成形機のスクリュの問題点に
鑑みて成されたもので、本発明の目的は、スクリュ先端
部に形成された雌ネジ部の疲労強度を改善するための浸
炭硬化方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the screw of the conventional plastic injection molding machine, and an object of the present invention is to form the screw at the tip of the screw. It is another object of the present invention to provide a carburizing and hardening method for improving the fatigue strength of a female screw portion.
【０００６】[0006]
【課題を解決するための手段】本発明のプラスチック用
射出成形機スクリュの雌ネジ部の浸炭硬化方法は、プラ
スチック用射出成形機スクリュの先端に形成された雌ネ
ジ部の浸炭硬化方法であって、炭素鋼または合金鋼から
なる素材を前記スクリュの形状に加工し、スクリュ先端
部の外表面の温度が２００℃以上３００℃以下になる様
に、前記雌ネジ部に溶融状態の液体浸炭剤を充填し、前
記液体浸炭剤が凝固したところで、８５０℃以上９５０
℃以下の温度に保持され、前記液体浸炭剤と同一の液体
浸炭剤からなるソルトバスの中に、前記雌ネジ部を含む
前記スクリュの先端部分のみを浸漬して、前記雌ネジ部
の表層に浸炭焼き入れ層を生成させること、を特徴とす
る。The method for carburizing and hardening a female screw portion of a plastic injection molding machine screw according to the present invention is a method for carburizing and hardening a female screw portion formed at the tip of a plastic injection molding machine screw. A material made of carbon steel or alloy steel is processed into the shape of the screw, and a liquid carburizing agent in a molten state is applied to the female screw portion so that the temperature of the outer surface of the screw tip becomes 200 ° C or more and 300 ° C or less. After filling and solidification of the liquid carburizing agent, 850 ° C. or more and 950 ° C.
° C. or less, and immersed only the tip portion of the screw including the female screw portion in a salt bath made of the same liquid carburizing agent as the liquid carburizing agent, to the surface layer of the female screw portion Forming a carburized and quenched layer.
【０００７】好ましくは、前記スクリュの素材として、
例えば、ＳＣＭ４１５、ＳＣＭ４３５、ＳＣＭ４４０あ
るいはＳＣＭ４４５（ＪＩＳ Ｇ ４１０５）などのク
ロムモリブデン鋼、または、ＳＵＳ４２０Ｊ２（ＪＩＳ
Ｇ ４３０３）などのマルテンサイト系ステンレス鋼
を使用する。Preferably, as a material of the screw,
For example, chromium molybdenum steel such as SCM415, SCM435, SCM440 or SCM445 (JIS G 4105), or SUS420J2 (JIS
G4303) or the like.
【０００８】また、上記の浸炭硬化方法は、炭素鋼系の
非調質鋼（Ｃ：０．３５〜０．５５ｗｔ％、Ｓｉ：０．
５ｗｔ％以下、Ｍｎ：０．７０〜１．００ｗｔ％、Ｖ：
０．０８〜０．１２）に対しても適用することができ
る。The above carburizing and hardening method is based on a non-heat treated carbon steel (C: 0.35 to 0.55 wt%, Si: 0.
5 wt% or less, Mn: 0.70-1.00 wt%, V:
0.08 to 0.12).
【０００９】本発明のスクリュの雌ネジ部の浸炭硬化方
法によれば、前記ソルトバスの中に、前記スクリュの雌
ネジ部及びその近傍のみを浸漬して処理するので、スク
リュ全体をガス浸炭炉の中に収容する従来の場合とは異
なり、スクリュの全体形状に変形が生ずることがない。According to the method for carburizing and hardening a female screw portion of a screw according to the present invention, only the female screw portion of the screw and its vicinity are immersed in the salt bath for processing, so that the entire screw is subjected to a gas carburizing furnace. Unlike the conventional case in which the screw is accommodated in the screw, no deformation occurs in the entire shape of the screw.
【００１０】なお、ソルトバス中で浸炭処理を行う上記
の方法に代って、雌ネジ部に液体浸炭剤を充填した後、
８５０℃以上９５０℃以下の温度に保持された加熱炉の
中に、前記雌ネジ部を含む前記スクリュの先端部分のみ
を収容して、前記雌ネジ部の表層に浸炭焼き入れ層を生
成させることもできる。[0010] Instead of the above-mentioned method of carburizing in a salt bath, after filling the female screw portion with a liquid carburizing agent,
In a heating furnace maintained at a temperature of 850 ° C. or more and 950 ° C. or less, only a tip portion of the screw including the female screw portion is housed, and a carburized and quenched layer is formed on a surface layer of the female screw portion. Can also.
【００１１】[0011]
【発明の実施の形態】図１及び図２を用いて、本発明に
基づくスクリュの雌ネジ部の浸炭硬化方法の一例につい
て説明する。先ず、ソルトバス６の中で液体浸炭剤５を
溶融し、次に、図１に示す様に、スクリュ先端部に形成
された雌ネジ部２の中に、溶融した液体浸炭剤５を注ぎ
込む。なお、液体浸炭剤５を注ぎ込んだ時に、スクリュ
先端部の外表面の温度が２００〜３００℃の温度範囲に
なる様に、液体浸炭剤５の溶融温度及び注入速度を調整
する。次いで、スクリュ先端部の温度を２００〜３００
℃の温度範囲に維持したまま、雌ネジ部２の中で液体浸
炭剤５が凝固するのを待つ。1 and 2, an example of a method for carburizing and curing a female screw portion of a screw according to the present invention will be described. First, the liquid carburizing agent 5 is melted in a salt bath 6, and then, as shown in FIG. 1, the molten liquid carburizing agent 5 is poured into the female screw portion 2 formed at the screw tip. In addition, the melting temperature and injection speed of the liquid carburizing agent 5 are adjusted so that the temperature of the outer surface of the screw tip is in the temperature range of 200 to 300 ° C. when the liquid carburizing agent 5 is poured. Next, the temperature of the screw tip was adjusted to 200 to 300.
While maintaining the temperature range of ° C., wait for the liquid carburizing agent 5 to solidify in the female screw portion 2.
【００１２】なお、液体浸炭剤５としては、例えば、Ｎ
ａＣＮ：１０〜２０ｗｔ％、ＢａＣｌ2：４０〜６０ｗ
ｔ％、ＮａＨＣＯ3：１５〜３０ｗｔ％、ＫＣｌ：１０
〜２０ｗｔ％、からなる液体浸炭剤がある。The liquid carburizing agent 5 is, for example, N 2
aCN: 10~20wt%, BaCl 2: 40~60w
t%, NaHCO 3 : 15 to 30 wt%, KCl: 10
-20% by weight of a liquid carburizing agent.
【００１３】雌ネジ部２の中で液体浸炭剤５が凝固した
ところで、スクリュ１を逆さまにして（即ち、スクリュ
先端側が下方に来る姿勢にして）、図２に示す様に、雌
ネジ部２を含むスクリュ１の先端部分のみを、液体浸炭
剤５を収容したソルトバス６の中に浸漬する。ソルトバ
ス６の温度を、８５０〜９５０℃程度に維持した状態
で、約２時間、浸炭処理を行った後、１５０〜２００℃
程度に維持された亜硝酸の浴の中にスクリュ１の先端部
分を浸漬して急冷し、焼入れを行う。なお、上記の浸炭
時間は、スクリュ１の材料により異なる。When the liquid carburizing agent 5 has solidified in the female screw portion 2, the screw 1 is turned upside down (that is, the posture in which the screw tip side is downward), and as shown in FIG. Is immersed in the salt bath 6 containing the liquid carburizing agent 5 only. After carburizing for about 2 hours while maintaining the temperature of the salt bath 6 at about 850 to 950 ° C., 150 to 200 ° C.
The tip of the screw 1 is immersed in a nitrous acid bath maintained at an appropriate level, rapidly cooled, and quenched. The above-mentioned carburizing time differs depending on the material of the screw 1.
【００１４】以上の工程によって、雌ネジ部２の表層に
０．３〜０．６ｍｍ程度の浸炭焼き入れ層を形成するこ
とができる。また、スクリュ１の先端部分のみが加熱さ
れるので、スクリュ全体の変形を小さく抑えることがで
きる。Through the above steps, a carburized and quenched layer of about 0.3 to 0.6 mm can be formed on the surface layer of the female screw portion 2. Further, since only the tip portion of the screw 1 is heated, deformation of the entire screw can be suppressed.
【００１５】なお、上記の工程において、液体浸炭剤５
を注ぎ込んだ時からソルトバス６に浸漬するまでの間、
スクリュ先端部の外表面の温度が２００〜３００℃の温
度範囲になる様に調整するのは、表１に示す様に、スク
リュの変形を防止するとともに、酸化スケールの発生を
防止するためである。なお、表１は、雌ネジ部の予熱温
度と、スクリュに生ずるたわみとの関係を、ＳＣＭ４４
０製で全長１０００ｍｍのスクリュを用いて調べた結果
である。In the above process, the liquid carburizing agent 5
From the time of pouring to the time of immersion in the salt bath 6
The reason why the temperature of the outer surface of the screw tip is adjusted to be in the temperature range of 200 to 300 ° C. is to prevent the deformation of the screw and the generation of oxide scale as shown in Table 1. . Table 1 shows the relationship between the preheating temperature of the female screw portion and the deflection generated in the screw.
This is a result of an examination using a screw made of No. 0 and having a total length of 1000 mm.
【００１６】[0016]
【表１】 [Table 1]
【００１７】なお、浸炭焼き入れ層の深さは、０．３〜
０．５ｍｍ程度が適当である。これは、表２に示す片振
り引張り疲労試験結果から分かる様に、浸炭焼き入れ層
が０．３ｍｍ未満では疲労強度が改善されないこと、及
び、０．５ｍｍ以上では疲労強度が更に増大する傾向が
見られないことによる。なお、表２は、浸炭焼き入れ層
の深さと、片振り引張り疲労強度（１０7サイクル疲労
強度）との関係を、ＳＣＭ４４０材を用いて調べた結果
である。The depth of the carburized and quenched layer is 0.3 to
About 0.5 mm is appropriate. This means that, as can be seen from the results of the pulsating tensile fatigue test shown in Table 2, the fatigue strength is not improved when the carburized and quenched layer is less than 0.3 mm, and the fatigue strength tends to further increase when the thickness is 0.5 mm or more. By not being seen. In addition, Table 2 shows the result of examining the relationship between the depth of the carburized and quenched layer and the pulsating tensile fatigue strength (10 7 cycle fatigue strength) using SCM440 material.
【００１８】[0018]
【表２】 [Table 2]
【００１９】各種の材料を用いて、本発明に基づく方法
により浸炭処理が施されたスクリュを試作した。それら
のスクリュをプラスチック用射出成形機に組み込んで、
それらの寿命を調査した。その結果を表３示す。なお、
表３の中には、比較のため、浸炭処理が施されていない
従来のスクリュについての試験結果も合わせて示してあ
る。Using various materials, screws carburized by the method according to the present invention were prototyped. By incorporating those screws into a plastic injection molding machine,
Their life was investigated. Table 3 shows the results. In addition,
Table 3 also shows, for comparison, test results for a conventional screw that has not been carburized.
【００２０】[0020]
【表３】 [Table 3]
【００２１】本発明に基づく方法により浸炭処理が施さ
れたスクリュは、全て１００万回以上の寿命を示した。
これに対して、浸炭処理が施されていない従来のスクリ
ュの寿命は、１０万〜５０万サイクル程度であった。The screws carburized by the method according to the present invention all exhibited a life of 1,000,000 times or more.
On the other hand, the life of a conventional screw that has not been carburized was about 100,000 to 500,000 cycles.
【００２２】なお、上記の例においては、雌ネジ部２に
液体浸炭剤５を充填した後、スクリュ先端部をソルトバ
ス６の中に浸漬して浸炭処理を行っているが、この方法
に代わって、図３に示す様に、雌ネジ部２に液体浸炭剤
５を充填した後、スクリュ先端部を上端にして、スクリ
ュ先端部のみを窒素ガス雰囲気の加熱炉８の中に収容し
て、浸炭処理を行うこともできる。なお、この方法の場
合、雌ネジ部２に充填した液体浸炭剤５の凝固を待つ必
要はない。In the above-mentioned example, after the female thread portion 2 is filled with the liquid carburizing agent 5, the tip of the screw is immersed in the salt bath 6 to perform the carburizing treatment. Then, as shown in FIG. 3, after filling the internal thread portion 2 with the liquid carburizing agent 5, the screw tip is placed at the upper end, and only the screw tip is housed in the heating furnace 8 in a nitrogen gas atmosphere. Carburizing treatment can also be performed. In this method, it is not necessary to wait for the liquid carburizing agent 5 filled in the female screw portion 2 to solidify.
【００２３】[0023]
【発明の効果】本発明の浸炭処理方法によれば、スクリ
ュの変形を伴わずに、スクリュ先端の雌ネジ部に浸炭処
理を施すことができる。その結果、プラスチック用射出
成形機のスクリュの寿命を大幅に向上させることができ
る。According to the carburizing method of the present invention, the female screw at the screw tip can be carburized without deforming the screw. As a result, the life of the screw of the plastic injection molding machine can be significantly improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に基づく浸炭処理方法において、スクリ
ュ先端の雌ネジ部に液体浸炭剤を充填した状態を示す
図。FIG. 1 is a view showing a state in which a liquid carburizing agent is filled in a female screw portion at a screw tip in a carburizing method according to the present invention.
【図２】本発明に基づく浸炭処理方法において、スクリ
ュ先端の雌ネジ部に浸炭処理を施している状態を示す
図。FIG. 2 is a view showing a state in which a carburizing process is performed on a female screw portion at a screw tip in the carburizing process method according to the present invention.
【図３】本発明に基づく他の浸炭処理方法において、ス
クリュ先端の雌ネジ部に浸炭処理を施している状態を示
す図。FIG. 3 is a view showing a state in which a carburizing process is performed on a female screw portion at a screw tip in another carburizing method according to the present invention.
【図４】プラスチック用射出成形機のスクリュの概要を
示す図。FIG. 4 is a view showing an outline of a screw of an injection molding machine for plastics.
【図５】スクリュ先端部に形成された雌ネジ部の形状を
示す部分拡大断面図。FIG. 5 is a partially enlarged sectional view showing a shape of a female screw portion formed at a screw tip portion.
１・・・スクリュ、 ２・・・雌ネジ部、 ３・・・逃げ部、 ５・・・液体浸炭剤、 ６・・・ソルトバス、 ８・・・加熱炉。 DESCRIPTION OF SYMBOLS 1 ... screw, 2 ... female screw part, 3 ... relief part, 5 ... liquid carburizing agent, 6 ... salt bath, 8 ... heating furnace.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２２Ｃ 38/12 Ｃ２２Ｃ 38/12 (56)参考文献 特開 昭56−162623（ＪＰ，Ａ) 特開 平６−198713（ＪＰ，Ａ) 特開 平５−59523（ＪＰ，Ａ) 特開 昭56−33472（ＪＰ，Ａ) 特開 昭55−145155（ＪＰ，Ａ) 特開 昭62−256957（ＪＰ，Ａ) 特開 昭62−30016（ＪＰ，Ａ) 特開 昭64−75653（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 8/46 B29C 45/60 C21D 1/06 C21D 9/00 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 Identification code FI C22C 38/12 C22C 38/12 (56) References JP-A-56-162623 (JP, A) JP-A-6-198713 (JP) JP-A-5-59523 (JP, A) JP-A-56-33472 (JP, A) JP-A-55-145155 (JP, A) JP-A-62-256957 (JP, A) 62-30016 (JP, A) JP-A-64-75653 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 8/46 B29C 45/60 C21D 1/06 C21D 9 / 00
Claims (11)
端に形成された雌ネジ部の浸炭硬化方法であって、 炭素鋼または合金鋼からなる素材を前記スクリュの形状
に加工し、 スクリュ先端部の外表面の温度が２００℃以上３００℃
以下になる様に、前記雌ネジ部に溶融状態の液体浸炭剤
を充填し、 前記液体浸炭剤が凝固したところで、８５０℃以上９５
０℃以下の温度に保持され、前記液体浸炭剤と同一の液
体浸炭剤からなるソルトバスの中に、前記雌ネジ部を含
む前記スクリュの先端部分のみを浸漬して、前記雌ネジ
部の表層に浸炭焼き入れ層を生成させること、 を特徴とするプラスチック用射出成形機スクリュの雌ネ
ジ部の浸炭硬化方法。1. A method for carburizing and hardening a female screw portion formed at the tip of a screw of a plastic injection molding machine, comprising: processing a material made of carbon steel or alloy steel into the shape of the screw; Surface temperature is 200 ℃ or more and 300 ℃
The internal thread portion is filled with a liquid carburizing agent in a molten state so as to be below.
The temperature is maintained at 0 ° C. or lower, and only the tip portion of the screw including the female screw portion is immersed in a salt bath made of the same liquid carburizing agent as the liquid carburizing agent, thereby forming a surface layer of the female screw portion. A method of carburizing and hardening the female thread of a screw for a plastic injection molding machine, comprising:
ン鋼であることを特徴とする請求項１に記載のプラスチ
ック用射出成形機スクリュの雌ネジ部の浸炭硬化方法。2. The method according to claim 1, wherein a material of the screw is chromium molybdenum steel.
ＳＣＭ４３５、ＳＣＭ４４０またはＳＣＭ４４５の内の
いずれか一つであることを特徴とする請求項２に記載の
プラスチック用射出成形機スクリュの雌ネジ部の浸炭硬
化方法。3. The screw is made of SCM415,
The method for carburizing and curing a female screw portion of a plastic injection molding machine screw according to claim 2, wherein the screw is one of SCM435, SCM440 and SCM445.
系ステンレス鋼であることを特徴とする請求項１に記載
のプラスチック用射出成形機スクリュの雌ネジ部の浸炭
硬化方法。4. The method according to claim 1, wherein a material of the screw is martensitic stainless steel.
２であることを特徴とする請求項４に記載のプラスチッ
ク用射出成形機スクリュの雌ネジ部の浸炭硬化方法。5. The screw is made of SUS420J.
5. The method for carburizing and hardening an internal thread of a screw for a plastic injection molding machine according to claim 4, wherein
０．５５ｗｔ％、Ｓｉ：０．５ｗｔ％以下、Ｍｎ：０．
７０〜１．００ｗｔ％、Ｖ：０．０８〜０．１２、を含
む炭素鋼系の非調質鋼であることを特徴とする請求項１
に記載のプラスチック用射出成形機スクリュの雌ネジ部
の浸炭硬化方法。6. The screw material is C: 0.35 to 0.35.
0.55 wt%, Si: 0.5 wt% or less, Mn: 0.
2. A carbon steel non-heat treated steel containing 70 to 1.00 wt% and V: 0.08 to 0.12.
3. The method of carburizing and hardening a female screw part of a screw for an injection molding machine for plastic according to the above.
端に形成された雌ネジ部の浸炭硬化方法であって、 炭素鋼または合金鋼からなる素材を前記スクリュの形状
に加工し、 スクリュ先端部の外表面の温度が２００℃以上３００℃
以下になる様に、前記雌ネジ部に溶融状態の液体浸炭剤
を充填し、 次いで、８５０℃以上９５０℃以下の温度に保持された
加熱炉の中に、前記雌ネジ部を含む前記スクリュの先端
部分のみを収容して、前記雌ネジ部の表層に浸炭焼き入
れ層を生成させること、 を特徴とするプラスチック用射出成形機スクリュの雌ネ
ジ部の浸炭硬化方法。7. A method for carburizing and hardening a female screw portion formed at the tip of a screw of a plastic injection molding machine, comprising: processing a material made of carbon steel or alloy steel into the shape of the screw; Surface temperature is 200 ℃ or more and 300 ℃
The internal thread portion is filled with a liquid carburizing agent in a molten state so as to be as follows. Then, in a heating furnace maintained at a temperature of 850 ° C. or more and 950 ° C. or less, the screw including the internal thread portion A method for carburizing and hardening a female screw portion of a screw for a plastic injection molding machine, wherein only a tip portion is accommodated to form a carburized and quenched layer on a surface layer of the female screw portion.
ン鋼であることを特徴とする請求項７に記載のプラスチ
ック用射出成形機スクリュの雌ネジ部の浸炭硬化方法。8. The method according to claim 7, wherein a material of the screw is chromium molybdenum steel.
ＳＣＭ４３５、ＳＣＭ４４０またはＳＣＭ４４５の内の
いずれか一つであることを特徴とする請求項８に記載の
プラスチック用射出成形機スクリュの雌ネジ部の浸炭硬
化方法。9. The material of the screw is SCM415,
The method for carburizing and hardening a female screw portion of a screw for a plastic injection molding machine according to claim 8, wherein the screw is one of SCM435, SCM440 and SCM445.
ト系ステンレス鋼であることを特徴とする請求項７に記
載のプラスチック用射出成形機スクリュの雌ネジ部の浸
炭硬化方法。10. The method according to claim 7, wherein a material of the screw is martensitic stainless steel.
Ｊ２であることを特徴とする請求項１０に記載のプラス
チック用射出成形機スクリュの雌ネジ部の浸炭硬化方
法。11. The screw is made of SUS420.
The method for carburizing and curing a female screw portion of a screw for a plastic injection molding machine according to claim 10, wherein J2 is J2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28017698A JP3267566B2 (en) | 1998-10-01 | 1998-10-01 | Method of carburizing and hardening the internal thread of a plastic injection molding machine screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28017698A JP3267566B2 (en) | 1998-10-01 | 1998-10-01 | Method of carburizing and hardening the internal thread of a plastic injection molding machine screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000109968A JP2000109968A (en) | 2000-04-18 |
| JP3267566B2 true JP3267566B2 (en) | 2002-03-18 |
Family
ID=17621365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28017698A Expired - Fee Related JP3267566B2 (en) | 1998-10-01 | 1998-10-01 | Method of carburizing and hardening the internal thread of a plastic injection molding machine screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3267566B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101063216B1 (en) | 2009-11-10 | 2011-09-07 | 현대자동차주식회사 | Heat treatment method for vanadium carbide hardening |
| CN107502708A (en) * | 2017-08-22 | 2017-12-22 | 厦门真冈热处理有限公司 | The heat treatment method of automobile SCM435 steel high-intensity fasteners |
-
1998
- 1998-10-01 JP JP28017698A patent/JP3267566B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000109968A (en) | 2000-04-18 |
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