JPH034006B2 - - Google Patents
Info
- Publication number
- JPH034006B2 JPH034006B2 JP21037985A JP21037985A JPH034006B2 JP H034006 B2 JPH034006 B2 JP H034006B2 JP 21037985 A JP21037985 A JP 21037985A JP 21037985 A JP21037985 A JP 21037985A JP H034006 B2 JPH034006 B2 JP H034006B2
- Authority
- JP
- Japan
- Prior art keywords
- wear
- screw head
- ceramic
- screw
- ring valve
- 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
- 239000000919 ceramic Substances 0.000 claims description 15
- 238000001746 injection moulding Methods 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910010293 ceramic material Inorganic materials 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000007751 thermal spraying Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はセラミツク部品の成形において使用す
るスクリユヘツド及びリングバルブの摩耗低減を
図つたセラミツク成形用射出成形装置。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is an injection molding apparatus for ceramic molding, which is designed to reduce wear on screw heads and ring valves used in molding ceramic parts.
（従来の技術）
従来、セラミツク材料やガラス充填した樹脂材
料による射出成形を行なう場合、スクリユヘツド
やリングバルブ等に摩耗が発生する。(Prior Art) Conventionally, when injection molding is performed using ceramic materials or glass-filled resin materials, wear occurs on screw heads, ring valves, etc.
それ故、これら摺動部品のスクリユ組立体は、
熱処理を行ない材質の硬度を上げて耐摩耗性を向
上させている。摩耗を防止する手段としては、材
料の選定（合金工具鋼や高速度鋼の採用）、選定
材料の焼入焼戻し、あるいは表面硬化法、たとえ
ばTic（チタンカーバイド）処理等がある。 Therefore, the screw assembly of these sliding parts is
Heat treatment is performed to increase the hardness of the material and improve wear resistance. Measures to prevent wear include material selection (adopting alloy tool steel or high-speed steel), quenching and tempering the selected material, or surface hardening methods such as Tic (titanium carbide) treatment.
また、特開昭56−162623号公報で開示されてい
るように、特にスクリユヘツドにおいて、これを
焼入処理した後、このヘツドの円錐部の温度は低
く、ヘツドのねじ部は温度を高くして焼戻しをす
るとともに、ねじ部に表面窒化処理してスクリユ
ヘツドの剛性と耐摩耗性を図つたものが知られて
いる。 Furthermore, as disclosed in JP-A-56-162623, after the screw head is hardened, the temperature of the conical part of the head is low and the temperature of the threaded part of the head is high. It is known that the screw head is tempered and surface nitrided to improve the rigidity and wear resistance of the screw head.
このように、射出成形装置において、スクリユ
ヘツドやリングバルブのように摺動する部材の耐
摩耗性を向上させる必要があつた。 Thus, in injection molding equipment, there has been a need to improve the wear resistance of sliding members such as screw heads and ring valves.
（発明が解決しようとする問題点）
しかしながら、これらスクリユ組立体としての
部品は、これまで硬質樹脂材料の射出成形を対称
に熱処理方法が考えられており、セラミツク材料
で射出成形する場合は、特に、スクリユヘツドと
リングバルブとの当り面に硬質のセラミツクが介
在するので、従来以上に高荷重が加わることにな
り、摩耗の発生が顕著となるという問題点があつ
た。(Problems to be Solved by the Invention) However, heat treatment methods for these parts as screw assemblies have been considered for injection molding of hard resin materials. Since a hard ceramic is interposed between the contact surface of the screw head and the ring valve, a higher load than before is applied, resulting in a problem in that wear becomes noticeable.
このため、従来のTic処理では、ビツカース硬
度が3000（Hv）で、かつ処理層が５〜15μｍと薄
いため、セラミツクによる荷重が加わると処理層
に割れや剥離現象が発生し、摩耗が増大する。 For this reason, in conventional TIC treatment, the Vickers hardness is 3000 (Hv) and the treated layer is as thin as 5 to 15 μm, so when a load from the ceramic is applied, cracking or peeling occurs in the treated layer, increasing wear. .
したがつて、これらの摩耗により、保守部品の
コスト、取換え費、製品の品質に重大な問題をも
たらすという欠点があつた。 Therefore, this wear causes serious problems in the cost of maintenance parts, replacement costs, and product quality.
このような問題点を解消するため、本発明は射
出部のスクリユヘツドとリングバルブの当接面に
WC（タングステンカーバイド）を適量溶射する
ことにより、耐摩耗性を向上させたセラミツク成
形用射出成形装置を提供することを目的とする。 In order to solve these problems, the present invention has developed a structure in which a contact surface between the screw head of the injection section and the ring valve is
The purpose of this invention is to provide an injection molding device for ceramic molding that has improved wear resistance by thermally spraying an appropriate amount of WC (tungsten carbide).
（問題点を解決するための手段）
上記目的を達成するため、本発明はリングバル
ブの前端面と、該前端面に当接自在なスクリユヘ
ツドの後端面とのそれぞれに、タングステンカー
バイドを溶射したことを特徴としている。さらに
その溶射膜の厚さを３〜４mmとしている。(Means for Solving the Problems) In order to achieve the above object, the present invention includes thermally spraying tungsten carbide on each of the front end surface of the ring valve and the rear end surface of the screw head that can freely come into contact with the front end surface. It is characterized by Furthermore, the thickness of the sprayed film is set to 3 to 4 mm.
（作用）
このような構成としたことから、スクリユヘツ
ドとリングバルブとの当接面にセラミツクが介在
して高荷重が作用しても、WCの溶射による両当
接面の強度は所定の硬度（600〜800Hv）を有し、
かつ処理層が３〜４mmと厚いので、摩耗現象の発
生が少なく、各部品の寿命を向上させることがで
きる。(Function) With this structure, even if a high load is applied to the abutting surfaces between the screw head and the ring valve with ceramic interposed, the strength of both abutting surfaces due to the thermal spraying of WC is maintained at the specified hardness ( 600~800Hv),
In addition, since the treated layer is as thick as 3 to 4 mm, wear phenomena are less likely to occur and the life of each component can be improved.
（実施例） 本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described based on the drawings.
第１図および第２図に示すように、射出成形装
置の射出部１は、中空筒状のシリンダ２を有し、
このシリンダ２内には、らせん条３が突出形成さ
れたスクリユ４が回転自在に挿入され、このスク
リユ４の先端には、スクリユヘツド５がねじ結合
されている。 As shown in FIGS. 1 and 2, the injection section 1 of the injection molding apparatus has a hollow cylinder 2,
A screw 4 having a protruding spiral strip 3 is rotatably inserted into the cylinder 2, and a screw head 5 is screwed to the tip of the screw 4.
スクリユヘツド５はノズル６内に挿入される円
錐部７と、この円錐部７の後端面に段差部８を形
成する小径部９と、スクリユ４に螺合するねじ部
１０とからなつている。 The screw head 5 consists of a conical portion 7 inserted into the nozzle 6, a small diameter portion 9 forming a stepped portion 8 on the rear end surface of the conical portion 7, and a threaded portion 10 screwed into the screw 4.
また、円錐部７の後端外周部分には、スクリユ
ヘツドの長手方向に沿つて小径部９より延びる複
数の横溝１１を所定間隔に設けられている。小径
部９の後部には、その径を一段太くした弁座１２
があり、段差部８と弁座１２間にリングバルブ１
３を遊嵌している。弁座１２とスクリユ前面間に
はスペーサ１４を介在させている。 Further, a plurality of lateral grooves 11 are provided at predetermined intervals on the outer peripheral portion of the rear end of the conical portion 7, extending from the small diameter portion 9 along the longitudinal direction of the screw head. At the rear of the small diameter portion 9, there is a valve seat 12 whose diameter is increased by one step.
There is a ring valve 1 between the stepped portion 8 and the valve seat 12.
3 is loosely fitted. A spacer 14 is interposed between the valve seat 12 and the front surface of the screw.
本発明のスクリユヘツド５とリングバルブ１３
との当接面、即ち、スクリユヘツド５の段差部８
を形成する円錐部後端面７ａと、リングバルブ１
３の前端面１３ａには、夫々WC（タングステン
カーバイド）、たとえばWC、CrC、SiC、Ni、
Bc等の複合材料で比重が9.5、ビツカース硬度
900Hv以上のものを適量（３〜４mm）溶射してい
る。 Screw head 5 and ring valve 13 of the present invention
The contact surface with the screw head 5, that is, the stepped portion 8 of the screw head 5
and the ring valve 1.
WC (tungsten carbide) such as WC, CrC, SiC, Ni,
Composite material such as Bc with specific gravity of 9.5 and Bitkers hardness
A suitable amount (3-4mm) of 900Hv or higher is sprayed.
なお、第２図中、１５はホツパでセラミツク等
の射出成形材料１７を収納する容器、１８はシリ
ンダ２を加熱するヒータ、１９は金型である。 In FIG. 2, 15 is a hopper and is a container for storing injection molding material 17 such as ceramic, 18 is a heater for heating the cylinder 2, and 19 is a mold.
次に、上述の構成からなる射出部を備えた射出
成形装置の動作を説明する。 Next, the operation of the injection molding apparatus including the injection section configured as described above will be explained.
まず、ホツパ１５からセラミツク材料１７を加
熱シリンダ２内に供給すると、スクリユ４の回転
とともに、材料１７はスクリユヘツド５とリング
バルブ１３間を通り、円錐部７の後端に位置する
横溝１１を経由して加熱シリンダ２の先端に送り
出される。 First, when the ceramic material 17 is fed into the heating cylinder 2 from the hopper 15, as the screw 4 rotates, the material 17 passes between the screw head 5 and the ring valve 13, and passes through the lateral groove 11 located at the rear end of the conical portion 7. and sent out to the tip of the heating cylinder 2.
このとき、円錐部後端面７ａとリングバルブ前
端面１３ａとの当接面にもセラミツク材料１７が
入り込み、このセラミツク材料１７の介在によ
り、特に両部品５，１３の当接面が摩耗すること
になる。 At this time, the ceramic material 17 also enters the contact surface between the conical portion rear end surface 7a and the ring valve front end surface 13a, and due to the interposition of the ceramic material 17, the contact surfaces of both parts 5 and 13 are particularly likely to wear out. Become.
この後、後退したスクリユ４を前進させてセラ
ミツク材料１７をノズル６から金型１９へ射出す
る。 Thereafter, the screw 4 that has been retreated is moved forward to inject the ceramic material 17 from the nozzle 6 into the mold 19.
上記射出工程のサイクルを繰り返すと、スクリ
ユヘツド５とリングバルブ１３との当接面を徐々
に摩耗するが、WC溶射した両部品５，１３で
は、第３図の実験データに示すように、摩耗に対
する顕著な効果が認められた。 When the cycle of the injection process described above is repeated, the abutting surfaces between the screw head 5 and the ring valve 13 gradually wear out, but both the parts 5 and 13 that have been sprayed with WC are resistant to wear, as shown in the experimental data in Figure 3. A remarkable effect was observed.
即ち、従来のSKD１１を焼入焼戻処理したも
の(A)や、TiC処理したもの(B)に比較して、WC処
理したもの(C)はその摩耗量が少なく、従来の約半
分であり、寿命も約２倍もつことが明らかとなつ
た。 In other words, compared to the conventional SKD11 quenched and tempered (A) and the TiC treated (B), the WC treated (C) has less wear, about half that of the conventional one. It has been revealed that the lifespan is approximately twice as long.
上記結果が得られた実験方法は、セラミツク材
料を封入したケース内において、インバータ制御
の減速機付きモータの駆動軸を外部からスクリユ
ヘツドに連結して回転させ、固定したリングバル
ブとの間で摩耗を測定したものである。 The experimental method that yielded the above results involved rotating the drive shaft of an inverter-controlled motor with a reduction gear connected to a screw head from the outside in a case sealed with ceramic material, and rotating the drive shaft between it and a fixed ring valve. This is what was measured.
設定条件は射出成形機の射出部と同一条件とす
るため、負荷600Kg、モータ回転数40rpm、温度
150℃、粘度5000Pa・Ｓ程度、セラミツクは樹脂
入りSi3N4が２に対してシリコンオイル１の重量
比となるもの、で行なつた。 The setting conditions are the same as those for the injection part of the injection molding machine, so the load is 600 kg, the motor rotation speed is 40 rpm, and the temperature is
The test was carried out at 150° C., with a viscosity of about 5000 Pa·S, and with a ceramic containing resin containing Si 3 N 4 in a weight ratio of 2 parts to silicone oil of 1 part.
この結果以下の事実が判明した。 As a result, the following facts were revealed.
TiC処理は高荷重のかかつたセラミツクの摩
耗には処理層が剥離して効果がない。 TiC treatment is ineffective against wear of ceramics under high loads as the treated layer peels off.
スクリユヘツド及びリングバルブの硬度は少
なくとも700Hv以上が良い。（最適値は900Hv
程度）
リングバルブの前端面に溝やＲをつけること
は片当りを誘発して良い結果を得られないが、
角度つき（約30゜程度）は良い。 The hardness of the screw head and ring valve should be at least 700Hv. (The optimal value is 900Hv
) Adding a groove or radius to the front end face of the ring valve will cause uneven contact and will not produce good results.
An angle (approximately 30°) is good.
WC処理の膜厚は、溶射によるため自由に設
定できるが、厚さ１mm程度の溶射では、しばら
く使用していると剥離現象が発生する。２mm溶
射すると、上記より寿命は長いが、それでもし
ばらくすると剥離して摩耗が増大する。したが
つて、樹脂用ならば15μｍの厚さでも摩耗がか
なり少ないことが明らかになつているが、セラ
ミツク用では厚さが大きいほど良い。 The film thickness of WC treatment can be set freely as it is thermal sprayed, but thermal spraying with a thickness of about 1 mm will cause peeling after a while of use. If 2 mm is sprayed, the life will be longer than the above, but it will still peel off after a while and wear will increase. Therefore, it has become clear that for resins, even a thickness of 15 μm causes considerably less wear, but for ceramics, the larger the thickness, the better.
実験の結果から、最適値はWC（900Hv）で３
〜４mm溶射したものが長期間使用しても摩耗が少
なく、この範囲が臨界値となつた。また多量に溶
射してもコストや作業時間等の関係から意味がな
い。 From the experimental results, the optimal value is 3 at WC (900Hv).
The thermally sprayed material of ~4 mm showed less wear even after long-term use, and this range became the critical value. Further, even if a large amount is sprayed, there is no point in cost and working time.
（発明の効果）
以上説明したことから明らかなように、セラミ
ツク成形用射出成形装置において、スクリユヘツ
ドとリングバルブの当接面に適量のWCを溶射し
たことにより、従来の熱処理、表面硬化処理等に
比べ摩耗量が減少するので、両部品の寿命を伸ば
し、取換え工数を低減できる。(Effects of the Invention) As is clear from the above explanation, by thermally spraying an appropriate amount of WC on the contact surface of the screw head and ring valve in the injection molding apparatus for ceramic molding, conventional heat treatment, surface hardening treatment, etc. Since the amount of wear is reduced, the life of both parts can be extended and the number of man-hours required for replacement can be reduced.
また摩耗によるスクリユヘツドやリングバルブ
の摩耗粉がセラミツク成形材料に混入することを
減ずるので、セラミツク製品の品質が向上する。
さらにWC溶射することにより、スクリユヘツ
ド、リングバルブの再生使用が可能となり、かつ
WC溶射は従来の熱処理に比較してコストが安い
というメリツトもある。 In addition, the quality of ceramic products is improved because it reduces the amount of abrasion powder from the screw head and ring valve that is caused by wear and gets mixed into the ceramic molding material.
Furthermore, by using WC spraying, it is possible to reuse screw heads and ring valves, and
WC thermal spraying also has the advantage of being cheaper than conventional heat treatment.
第１図は本発明のWC溶射を施した実施例の断
面構成図、第２図は射出成形装置の作用を説明す
るための射出部の概略断面構成図、第３図はWC
溶射と従来の処理方法における摩耗量の比較を示
すグラフ、第４図ないし第６図はスクリユヘツド
におけるそれぞれの処理方法、即ち第４図はTiC
処理、第５図はSKD１１の焼入焼戻し処理、第
６図はWC処理を施した状態を示す図で、一点鎖
線は所定シツト後における摩耗深さを示し、ａは
表面から内部への硬度の変化を示す断面図、ｂは
各硬度における摩耗量の変化を示す図である。
２……シリンダ、５……スクリユヘツド、７ａ
……円錐部後端面、１３……リングバルブ、１３
ａ……前端面。
Figure 1 is a cross-sectional configuration diagram of an embodiment of the present invention in which WC thermal spraying is applied, Figure 2 is a schematic cross-sectional configuration diagram of the injection part for explaining the operation of the injection molding device, and Figure 3 is WC spraying.
Graphs showing a comparison of the amount of wear between thermal spraying and conventional treatment methods, Figures 4 to 6 show the respective treatment methods for the screw head, i.e. Figure 4 shows TiC
Fig. 5 shows the state of SKD11 after quenching and tempering, and Fig. 6 shows the state after WC processing.The dashed line indicates the wear depth after a certain amount of wear, and a indicates the increase in hardness from the surface to the inside. A cross-sectional view showing changes, and b is a diagram showing changes in the amount of wear at each hardness. 2...Cylinder, 5...Screw head, 7a
... Cone rear end surface, 13 ... Ring valve, 13
a... Front end surface.
Claims (1)
在なスクリユヘツドの後端面とのそれぞれに、タ
ングステンカーバイドを溶射したことを特徴とす
るセラミツク成形用射出成形装置。 ２ 前記両端面の各々に溶射されるタングステン
カーバイドの溶射膜の厚さは、それぞれ３ないし
４mmであることを特徴とする特許請求の範囲第１
項記載のセラミツク成形用射出成形装置。[Scope of Claims] 1. An injection molding device for ceramic molding, characterized in that tungsten carbide is thermally sprayed on each of the front end surface of a ring valve and the rear end surface of a screw head that can freely come into contact with the front end surface. 2. Claim 1, wherein the thickness of the tungsten carbide sprayed film sprayed on each of the end faces is 3 to 4 mm.
An injection molding apparatus for molding ceramics as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21037985A JPS6268703A (en) | 1985-09-24 | 1985-09-24 | Injection molding device for molding ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21037985A JPS6268703A (en) | 1985-09-24 | 1985-09-24 | Injection molding device for molding ceramic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6268703A JPS6268703A (en) | 1987-03-28 |
| JPH034006B2 true JPH034006B2 (en) | 1991-01-22 |
Family
ID=16588367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21037985A Granted JPS6268703A (en) | 1985-09-24 | 1985-09-24 | Injection molding device for molding ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6268703A (en) |
-
1985
- 1985-09-24 JP JP21037985A patent/JPS6268703A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6268703A (en) | 1987-03-28 |
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