JPH0860334A - Manufacture of nozzle tip of injection molding machine - Google Patents
Manufacture of nozzle tip of injection molding machineInfo
- Publication number
- JPH0860334A JPH0860334A JP7219684A JP21968495A JPH0860334A JP H0860334 A JPH0860334 A JP H0860334A JP 7219684 A JP7219684 A JP 7219684A JP 21968495 A JP21968495 A JP 21968495A JP H0860334 A JPH0860334 A JP H0860334A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle tip
- tungsten carbide
- layer
- resistant alloy
- 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.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000000151 deposition Methods 0.000 claims abstract 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 36
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 26
- 229910052759 nickel Inorganic materials 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 8
- 238000003754 machining Methods 0.000 abstract description 2
- 238000007751 thermal spraying Methods 0.000 abstract 2
- 238000005299 abrasion Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Producing Shaped Articles From Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は射出成形機のノズ
ルチップに関し、特には耐磨耗性の高いノズルチップの
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle tip of an injection molding machine, and more particularly to a method of manufacturing a nozzle tip having high abrasion resistance.
【０００２】[0002]
【従来の技術】射出成形機において、例えば、ＦＲＰに
代表されるガラス繊維など各種の複合材を添加した合成
樹脂やセラミックなどの硬質材料を射出成形する場合、
該材料によって磨耗されやすいため、シリンダやスクリ
ュなどは高い硬度を有する材質によって構成する必要が
ある。特に、射出成形機のノズルチップはその細径部が
周辺のシリンダ部と比較して内径が細くなるため射出材
料の流速が速くなり、前記のような複合材を添加した材
料を用いる場合には、該ノズル口部が急激に著しく磨耗
されるという問題があった。また、ノズルチップはノズ
ルタッチの際にしばしば強い衝撃を受け割れやすいとい
う嫌いがあった。2. Description of the Related Art In an injection molding machine, for example, in the case of injection molding a hard material such as a synthetic resin or ceramic to which various composite materials such as glass fiber represented by FRP are added,
Since the material is easily worn by the material, the cylinder, the screw and the like need to be made of a material having high hardness. In particular, the nozzle tip of the injection molding machine has a smaller inner diameter than the peripheral cylinder portion, so the flow velocity of the injection material becomes faster, and when using a material to which the above composite material is added, However, there has been a problem that the nozzle mouth portion is abruptly and significantly worn. In addition, there is a dislike that the nozzle tip is apt to be cracked by a strong impact when the nozzle is touched.
【０００３】[0003]
【発明が解決しようとする課題】そこで、この発明は、
上記した問題点に鑑み提案されたものであって、セラミ
ックやガラス繊維を含む硬質材料に対して高い耐磨耗性
を有する射出成形機のノズルチップの製法を提供しよう
とするものである。SUMMARY OF THE INVENTION Therefore, the present invention
The present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a nozzle tip of an injection molding machine having high wear resistance to hard materials including ceramics and glass fibers.
【０００４】[0004]
【課題を解決するための手段】すなわち、この発明は、
ノズルチップ本体部の表面にニッケル基とタングステン
カーバイドのパウダーを混合溶着してタングステンカー
バイドが下部に沈下し上部がほとんどニッケル基のみの
溶着層を形成する工程と、次いで、前記溶着層の上部に
タングステンカーバイドのパウダーを溶着して全体とし
てタングステンカーバイドがニッケル基中にほぼ均一に
分散された耐磨合金層を形成する工程と、前記耐磨合金
層を所定のノズルチップ先端部形状および細径部分に加
工する工程を含むことを特徴とする射出成形機のノズル
チップの製造方法に係る。That is, the present invention provides:
Nickel-based and tungsten-carbide powder are mixed and welded on the surface of the nozzle tip body to form a welded layer in which the tungsten carbide sinks to the bottom and the upper part is almost only nickel-base, and then tungsten is deposited on the welded layer. A step of welding carbide powder to form a wear-resistant alloy layer in which tungsten carbide is almost uniformly dispersed in a nickel base as a whole, and the wear-resistant alloy layer is formed into a predetermined nozzle tip shape and a small diameter portion. The present invention relates to a method for manufacturing a nozzle tip of an injection molding machine, the method including a step of processing.
【０００５】[0005]
【発明の実施の形態】以下添付の図面に従ってこの発明
を詳細に説明する。図１はこの発明のノズルチップの一
例を示す断面図、図２はノズルチップ先端部の拡大断面
図、図３は耐磨合金よりなるノズルチップ先端部を形成
する第１工程を示す概略断面図、図４は同じく第２工程
を示す概略断面図、図５はこの発明のノズルチップを用
いて成形材料を射出した場合におけるノズル口径の変化
を示すグラフである。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a sectional view showing an example of a nozzle tip of the present invention, FIG. 2 is an enlarged sectional view of a nozzle tip end portion, and FIG. 3 is a schematic sectional view showing a first step of forming a nozzle tip end portion made of an abrasion resistant alloy. FIG. 4 is a schematic sectional view showing the second step, and FIG. 5 is a graph showing changes in the nozzle diameter when a molding material is injected using the nozzle tip of the present invention.
【０００６】この実施例におけるノズルチップ１０は、
図１に示されるようにノズルチップ本体部１１とノズル
チップ先端部１５とから構成されている。ノズルチップ
本体部１１は例えば窒化鋼やクロムモリブデンなどの高
い硬度を有する鋼材よりなり、その中心には樹脂通路で
ある先端が半球状の大径部１２が、その後端にはシリン
ダヘッド１９に螺着するためのねじ部１３がそれぞれ設
けられている。The nozzle tip 10 in this embodiment is
As shown in FIG. 1, it is composed of a nozzle tip body 11 and a nozzle tip tip portion 15. The nozzle tip body 11 is made of steel having a high hardness, such as nitriding steel or chrome molybdenum, and has a large diameter portion 12 having a hemispherical tip, which is a resin passage, at the center thereof and a cylinder head 19 screwed at the rear end thereof. Screw parts 13 for wearing are respectively provided.
【０００７】ノズルチップ先端部１５は、その後端面１
７において前記ノズルチップ本体部１１と一体に溶着さ
れており、その中心を前記大径部１２に連通する細径部
１６が貫通している。The nozzle tip tip portion 15 has a rear end face 1
In FIG. 7, the nozzle tip body 11 is integrally welded, and a small-diameter portion 16 that communicates with the large-diameter portion 12 passes through the center thereof.
【０００８】この細径部１６を含むノズルチップ先端部
１５は、ニッケル基とタングステンカーバイドがほぼ均
一に分散された耐磨合金Ａによって構成されている。図
２にその拡大断面図を示す。すなわち、ノズルチップ先
端部１５を構成するこの耐磨合金Ａは、ノズルチップ本
体部１１の表面にニッケル基３１とタングステンカーバ
イド３２がほぼ均一に分散した状態で溶着形成されてな
るものである。The tip portion 15 of the nozzle tip including the small diameter portion 16 is made of a wear-resistant alloy A in which nickel base and tungsten carbide are dispersed almost uniformly. FIG. 2 shows an enlarged sectional view thereof. That is, the wear-resistant alloy A forming the nozzle tip tip portion 15 is formed by welding the nickel base 31 and the tungsten carbide 32 on the surface of the nozzle tip body 11 in a substantially evenly dispersed state.
【０００９】ところで、両金属を混合溶着する場合、タ
ングステンカーバイドの比重が１５．８に対しニッケル
基が８．９と大きく異なるために均一な耐磨合金層を形
成するのが困難である。そこで、本発明では以下に述べ
る第１工程および第２工程によって耐磨合金層が形成さ
れる。When both metals are mixed and deposited, it is difficult to form a uniform wear-resistant alloy layer because the specific gravity of tungsten carbide is 15.8 and the nickel base is 8.9. Therefore, in the present invention, the abrasion resistant alloy layer is formed by the first step and the second step described below.
【００１０】まず、第１工程では、図３に示したよう
に、ノズルチップ本体部１１の表面に、ニッケル基３１
とタングステンカーバイド３２のパウダーを公知のプラ
ズマ溶着装置５０より混合溶着して、タングステンカー
バイド３２が下部に沈下し、上部はほとんどニッケル基
３１のみの溶着層Ａ１を形成する。両金属の混合比は、
例えば体積比でニッケル基５０％（全体量の２分の
１）：タングステンカーバイド２５％（全体量の４分の
１）の割合で公知のプラズマ溶着装置５０より混合溶着
する。図から理解されるように、両金属はその比重の相
違によってタングステンカーバイド３２が下部に沈下
し、上部はほとんどニッケル基３１のみの層となる。First, in the first step, as shown in FIG. 3, a nickel base 31 is formed on the surface of the nozzle tip body 11.
Powders of tungsten carbide 32 and tungsten carbide 32 are mixed and welded by a known plasma welding apparatus 50, the tungsten carbide 32 sinks to the lower portion, and the upper portion forms a welded layer A1 containing almost only nickel base 31. The mixing ratio of both metals is
For example, in a volume ratio, 50% (1/2 of the total amount) of nickel base and 25% (1/4 of the total amount) of tungsten carbide are mixed and welded by a known plasma welding apparatus 50. As can be understood from the figure, the two carbides have the tungsten carbide 32 settled in the lower part due to the difference in their specific gravities, and the upper part is almost a layer containing only the nickel base 31.
【００１１】次に、図４に示したように、第２工程で
は、前記溶着層Ａ１の上部にタングステンカーバイド３
２のパウダーのみを前記と同様プラズマ溶着装置５０に
よって溶着する。このときのタングステンカーバイドの
溶着量は、前記工程で溶着されたタングステンカーバイ
ドと同量（つまり２５％、全体量の４分の１）とするこ
とが好ましい。Next, as shown in FIG. 4, in the second step, the tungsten carbide 3 is formed on the upper part of the welding layer A1.
Only the powder No. 2 is welded by the plasma welding apparatus 50 as described above. The amount of tungsten carbide deposited at this time is preferably the same as the amount of tungsten carbide deposited in the above step (that is, 25%, which is a quarter of the total amount).
【００１２】この第２工程によって、図示のように、タ
ングステンカーバイド３２は第１工程で形成された溶着
層Ａ１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基３１の層中に入り込
み、全体としてタングステンカーバイド３２がニッケル
基３１中にほぼ均一な状態で分散された耐磨合金層Ａ２
が得られる。By the second step, as shown in the drawing, the tungsten carbide 32 enters the upper part of the weld layer A1 formed in the first step, that is, the layer of the nickel base 31 where the tungsten carbide was almost absent, Abrasion resistant alloy layer A2 in which tungsten carbide 32 as a whole is dispersed in a nickel base 31 in a substantially uniform state
Is obtained.
【００１３】そして、上記の工程によって耐磨合金層Ａ
２をノズルチップ本体１１に溶着形成した後、公知の放
電加工などによって所定のノズル先端部形状および細径
部分が加工される。Then, the abrasion resistant alloy layer A is formed by the above-mentioned steps.
After 2 is welded to the nozzle tip body 11, a predetermined nozzle tip shape and a small diameter portion are processed by known electric discharge machining or the like.
【００１４】図５に、この実施例によって得られたノズ
ルチップを用いて、ポリプロピレン樹脂をバインダーと
したフェライト粉末を射出成形した場合の、使用日数に
よる細径部の穴径の変化を示す。なお、この使用例にお
けるノズル口径は３ｍｍである。図中の符号６０はこの
発明のノズルチップの細径部であり、符号７０は従来の
窒化鋼製ノズルチップ細径部である。従来品にあっては
使用開始から７日後に細径部の磨耗が片肉２ｍｍを越え
使用不可能となったのに対し、この発明によるノズルチ
ップでは使用開始から１６５日後においても細径部の磨
耗は０．２５ｍｍであり充分使用可能であった。FIG. 5 shows the change in the hole diameter of the small diameter portion depending on the number of days of use when ferrite powder using polypropylene resin as a binder was injection-molded using the nozzle tip obtained in this example. The nozzle diameter in this usage example is 3 mm. Reference numeral 60 in the drawing denotes a small diameter portion of the nozzle tip of the present invention, and reference numeral 70 denotes a conventional nitride steel nozzle tip small diameter portion. In the conventional product, after 7 days from the start of use, the wear of the thin portion exceeds 2 mm on one side and cannot be used. On the other hand, in the nozzle tip according to the present invention, even after 165 days from the start of use, the thin portion remains thin. The wear was 0.25 mm, which was sufficient.
【００１５】[0015]
【発明の効果】以上図示し説明したようにこの発明によ
れば、ノズルチップ本体部の表面にニッケル基とタング
ステンカーバイドのパウダーを混合溶着してタングステ
ンカーバイドが下部に沈下し上部がほとんどニッケル基
のみの溶着層を形成した後に、前記溶着層の上部にタン
グステンカーバイドのパウダーを溶着することによっ
て、全体としてタングステンカーバイドがニッケル基中
にほぼ均一に分散された耐磨合金層が形成される。従っ
て、従来のノズルチップと比較して、その耐磨耗性を飛
躍的に向上させることができた。前記実験の結果によれ
ば、少なくとも２３倍以上の長期にわたる使用に際して
も、磨耗によるノズルチップの口径変化は著しく少なく
なった。また、このノズルチップによれば、ノズルタッ
チの際の衝撃に対しても高い耐久性を有するためノズル
チップ交換回数が減少し、射出成形機の連続運転が可能
となりコストの低減にも大きく寄与するものである。As shown and described above, according to the present invention, nickel base and tungsten carbide powder are mixed and welded on the surface of the nozzle tip body, the tungsten carbide sinks to the lower part, and the upper part contains only nickel base. After forming the weld layer, the tungsten carbide powder is welded to the upper part of the weld layer to form a wear-resistant alloy layer in which the tungsten carbide is dispersed almost uniformly in the nickel base as a whole. Therefore, as compared with the conventional nozzle tip, its wear resistance could be dramatically improved. According to the results of the above experiment, the change in the diameter of the nozzle tip due to wear was significantly reduced even when it was used for at least 23 times or more for a long time. Further, according to this nozzle tip, since it has high durability against impact at the time of nozzle touch, the number of times of nozzle tip replacement is reduced, continuous operation of the injection molding machine is possible, and it greatly contributes to cost reduction. It is a thing.
【図１】この発明のノズルチップの一例を示す断面図で
ある。FIG. 1 is a sectional view showing an example of a nozzle tip of the present invention.
【図２】ノズルチップ先端部の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a tip portion of a nozzle tip.
【図３】耐磨合金よりなるノズルチップ先端部を形成す
る第１工程を示す概略断面図である。FIG. 3 is a schematic cross-sectional view showing a first step of forming a tip portion of a nozzle tip made of an abrasion resistant alloy.
【図４】同じく第２工程を示す概略断面図である。FIG. 4 is a schematic sectional view showing a second step in the same manner.
【図５】この発明のノズルチップを用いて成形材料を射
出した場合におけるノズル口径の変化を示すグラフであ
る。FIG. 5 is a graph showing changes in nozzle diameter when a molding material is injected using the nozzle tip of the present invention.
１０ ノズルチップ １１ ノズルチップ本体部 １５ ノズルチップ先端部 １６ 細径部 ３１ ニッケル基 ３２ タングステンカーバイド Ａ 耐磨合金 Ａ１ 溶着層 Ａ２ 耐磨合金層 10 Nozzle Tip 11 Nozzle Tip Main Body 15 Nozzle Tip Tip 16 Small Diameter 31 Nickel Base 32 Tungsten Carbide A Abrasion Resistant Alloy A1 Welding Layer A2 Abrasion Resistant Alloy Layer
Claims (1)
とタングステンカーバイドのパウダーを混合溶着してタ
ングステンカーバイドが下部に沈下し上部がほとんどニ
ッケル基のみの溶着層を形成する工程と、 次いで、前記溶着層の上部にタングステンカーバイドの
パウダーを溶着して全体としてタングステンカーバイド
がニッケル基中にほぼ均一に分散された耐磨合金層を形
成する工程と、 前記耐磨合金層を所定のノズルチップ先端部形状および
細径部分に加工する工程を含むことを特徴とする射出成
形機のノズルチップの製造方法。1. A step of mixing and welding nickel base powder and tungsten carbide powder on the surface of a nozzle tip body to form a welding layer in which tungsten carbide sinks to the lower portion and the upper portion contains almost only nickel base, and then the welding is performed. A step of depositing tungsten carbide powder on the upper part of the layer to form a wear-resistant alloy layer in which tungsten carbide is dispersed almost uniformly in a nickel base as a whole, and the wear-resistant alloy layer is formed into a predetermined nozzle tip shape And a method of manufacturing a nozzle tip of an injection molding machine, including a step of processing into a small diameter portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7219684A JPH0860334A (en) | 1995-08-03 | 1995-08-03 | Manufacture of nozzle tip of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7219684A JPH0860334A (en) | 1995-08-03 | 1995-08-03 | Manufacture of nozzle tip of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0860334A true JPH0860334A (en) | 1996-03-05 |
Family
ID=16739357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7219684A Pending JPH0860334A (en) | 1995-08-03 | 1995-08-03 | Manufacture of nozzle tip of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0860334A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007513797A (en) * | 2003-08-13 | 2007-05-31 | ギュンター・ハイスカナルテヒニク・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング | Injection molding nozzle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186406A (en) * | 1985-02-13 | 1986-08-20 | Kubota Ltd | Injection molding machine nozzle with excellent wear resistance and corrosion resistance and its manufacturing method |
| JPH0270051A (en) * | 1988-09-06 | 1990-03-08 | Meiki Co Ltd | Formation of wear resistant structure of sliding part for injection molding machine |
-
1995
- 1995-08-03 JP JP7219684A patent/JPH0860334A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186406A (en) * | 1985-02-13 | 1986-08-20 | Kubota Ltd | Injection molding machine nozzle with excellent wear resistance and corrosion resistance and its manufacturing method |
| JPH0270051A (en) * | 1988-09-06 | 1990-03-08 | Meiki Co Ltd | Formation of wear resistant structure of sliding part for injection molding machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007513797A (en) * | 2003-08-13 | 2007-05-31 | ギュンター・ハイスカナルテヒニク・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング | Injection molding nozzle |
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