JPH02217216A - Bimetallic cylinder for plastic molding machine - Google Patents
Bimetallic cylinder for plastic molding machineInfo
- Publication number
- JPH02217216A JPH02217216A JP1038926A JP3892689A JPH02217216A JP H02217216 A JPH02217216 A JP H02217216A JP 1038926 A JP1038926 A JP 1038926A JP 3892689 A JP3892689 A JP 3892689A JP H02217216 A JPH02217216 A JP H02217216A
- Authority
- JP
- Japan
- Prior art keywords
- resistant
- cylinder
- wear
- base material
- corrosion
- 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.)
- Granted
Links
- 238000010137 moulding (plastic) Methods 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 239000011247 coating layer Substances 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 239000002775 capsule Substances 0.000 abstract description 7
- 238000001513 hot isostatic pressing Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000007924 injection Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000002345 surface coating layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- B29C45/62—Barrels or cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は使用時に内圧のかかる複合合金シリンダに関し
、特にプラスチック射出成形機あるいは押出成形機に用
いられるパイメタリックシリンダおよびその製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite alloy cylinder which is subjected to internal pressure during use, and more particularly to a pie metallic cylinder used in a plastic injection molding machine or an extrusion molding machine, and a method for manufacturing the same.
（従来技術）
プラスチック類の射出成形機や押出成形機においては、
従来からシリンダ内面に耐食・耐摩耗性のコーティング
が施された複合合金シリンダが使用されている。従来、
この種の複合合金シリンダの製造方法として、熱間静水
圧加圧処理（いわゆるＨＩＰ処理）により、シリンダ母
材内面に耐食・耐摩耗性の合金粉末を焼成する方法が行
われている。この方法は、上述したコーティング合金粉
末を中実中子によってシリンダ母材の内側に保持し、前
記ＨＩＰ処理によって前記粉末を焼成した後、前記中実
中子を除去し、これによ、て耐食・耐摩耗性コーティン
グを有する射出シリンダを得るものである。コーティン
グ層の割れや剥離を防止し、シリンダ母材の高強度化を
図るために、シリンダ母材を熱処理により高強度化する
ことのできる金属材料で形成し、コーティング層の基材
となる合金粉末を、耐食性を有しかつ熱処理変態特性お
よび熱膨張特性についてシリンダ母材と同質の金属材料
で形成し、その合金粉末をシリンダ母材内面に充鎮して
ＨＩＰ処理を行い、これによってコーティングを施され
たシリンダ母材をさらに高強度化熱処理する方法が提案
されている（特開昭６２−２９４１０６号公報）。(Prior art) In injection molding machines and extrusion molding machines for plastics,
Composite alloy cylinders with corrosion-resistant and wear-resistant coatings coated on the inner surface of the cylinders have traditionally been used. Conventionally,
As a manufacturing method for this type of composite alloy cylinder, a method is used in which corrosion-resistant and wear-resistant alloy powder is fired on the inner surface of the cylinder base material by hot isostatic pressing (so-called HIP treatment). In this method, the coating alloy powder described above is held inside the cylinder base material by a solid core, and after the powder is fired by the HIP treatment, the solid core is removed, thereby providing corrosion resistance. - Obtain an injection cylinder with a wear-resistant coating. In order to prevent cracking and peeling of the coating layer and to increase the strength of the cylinder base material, the cylinder base material is made of a metal material that can be strengthened through heat treatment, and alloy powder is used as the base material of the coating layer. is made of a metal material that has corrosion resistance and has the same heat treatment transformation and thermal expansion characteristics as the cylinder base material, and the inner surface of the cylinder base material is filled with the alloy powder and subjected to HIP treatment, thereby applying the coating. A method of heat-treating the cylinder base material to further increase its strength has been proposed (Japanese Unexamined Patent Publication No. 62-294106).
（発明が解決しようとする課題）
プラスチック類の射出成形機や押出成形機においては、
近年の精密成形に対応してますます高温、高圧での射出
、押出成形が要求されてきており、成形機稼動中にはシ
リンダ内面には２０００ｋｇｆ／Ｃ−もの高圧がかかる
ことがあり、シリンダが内圧により破損するトラブルが
起きている。上述した特開昭６２−２９４１０６号公報
記載の製造方法は複合シリンダの高強度化を達成する上
ではそれなりに有効ではあるが、シリンダ母材およびコ
ーティングの材質に制限を受け、また高硬度化熱処理な
どの工程が増し、コストがかかるという点で問題があっ
た。(Problems to be solved by the invention) In injection molding machines and extrusion molding machines for plastics,
In response to recent precision molding, injection and extrusion molding at higher temperatures and higher pressures have been required, and when the molding machine is in operation, pressure as high as 2000 kgf/C- can be applied to the inner surface of the cylinder, causing the cylinder to There have been problems with damage due to internal pressure. Although the manufacturing method described in JP-A No. 62-294106 mentioned above is somewhat effective in achieving high strength of composite cylinders, it is limited by the materials of the cylinder base material and coating, and also requires heat treatment to increase hardness. There was a problem in that it increased the number of steps and cost.
本発明は、特に複雑な工程を付加せずに使用時の高内圧
に耐え得、かつ低コストのプラスチック成形機用パイメ
タリックシリンダおよびその製造方法を提供するもので
ある。The present invention provides a pie-metallic cylinder for a plastic molding machine that can withstand high internal pressure during use without adding particularly complicated steps and is inexpensive, and a method for manufacturing the same.
（課題を解決するための手段）
本発明によるプラスチック成形機用パイメタリックシリ
ンダは、ＨＩＰ処理によって内面に耐食・耐摩耗合金コ
ーティングが施されたシリンダ内層部材を、焼きばめま
たは冷しぼめによってシリンダ母材に嵌入し、常温常圧
で耐食・耐摩耗合金コーティング層に圧縮残留応力が付
加されて成るものである。(Means for Solving the Problems) A pie metallic cylinder for a plastic molding machine according to the present invention has a cylinder inner layer member whose inner surface is coated with a corrosion-resistant and wear-resistant alloy by HIP treatment, and is molded into a cylinder by shrink fitting or cold shrinking. It is inserted into the base material and compressive residual stress is applied to the corrosion-resistant and wear-resistant alloy coating layer at room temperature and pressure.
また上述のパイメタリックシリンダを製造するには、コ
ーティング母材内に中子を挿入してその間に環状空間部
を形成し、前記環状空間部内に耐食・耐摩耗合金粉末を
充鎮、密封した後ＨＩＰ処理を行って耐食・耐摩耗コー
ティングの施されたシリンダ内層部材を得、これを焼き
ばめまたは冷しぼめ等によって別に用意したシリンダ母
材に嵌入させ、常温常圧でコーティング層内に圧縮残留
応力がかかるようにすることにより製造される。In addition, in order to manufacture the above-mentioned pi-metallic cylinder, a core is inserted into the coating base material to form an annular space therebetween, and the annular space is filled with corrosion-resistant and wear-resistant alloy powder and sealed. HIP processing is performed to obtain a cylinder inner layer member coated with anti-corrosion and anti-wear coating, which is then fitted into a separately prepared cylinder base material by shrink fitting or cold shrinking, and compressed into the coating layer at room temperature and pressure. Manufactured by applying residual stress.
（実施例）
次に、本発明を実施例について図面を参照して説明する
。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図（ａ）〜（Ｃ）は本発明に係る製造工程の途中の
状態における縦断面図である。まずＨＩＰ用カプセルｌ
内に中子４とコーティング層を形成すべきコーティング
母材２を路間芯状態に挿入し、この中子４とコーティン
グ母材２との間の空隙部に耐食・耐摩耗合金粉末３を充
填し、脱気、密封する（第１図（ａ））、この状態で第
１Ｖ！Ｊ（ｂ）＋７）如＜ＨＩＰ処理に供し、ＨＩＰ処
理完了後、カプセルｌと中子４を除去し、所定の外径、
内径に加工して第１図（Ｃ）のような耐食・耐摩耗合金
コーティング層３′が施されたシリンダ内層部材２′を
得る。このシリンダ内層部材２′を別に用意したシリン
ダ母材５内に焼きばめあるいは冷しぼめ等の手段で嵌入
させる（第２図）、常温常圧になったときシリンダ内層
部材２′はシリンダ母材５により外側から締め付けられ
るような状態となり、シリンダ内層部材２′の内面のコ
ーティング層３′には周方向に圧縮残留応力がかかった
状態となる。内面コーティング層３′にこのような圧縮
の残留応力が残っているプラスチック成形機用シリンダ
は、射出成形機あるいは押出成形機の運転時にシリンダ
内に高内圧（２０００〜２５００ｋｇｆ／ｃｊ）がかか
ってシリンダおよびコーティング層３′に引張応力が加
わると、この引張応力はコーティング層の圧縮残留応力
によって打ち消しあるいは軽減され、シリンダ内層部材
とシリンダ母材の接合部にも無理な力が生じなく、シリ
ンダ全体の耐久性が高まり、長寿命化がもたらされる。FIGS. 1(a) to 1(C) are longitudinal cross-sectional views in the middle of the manufacturing process according to the present invention. First, HIP capsule l
The core 4 and the coating base material 2 on which the coating layer is to be formed are inserted between the cores 4 and 2, and the gap between the core 4 and the coating base material 2 is filled with corrosion-resistant and wear-resistant alloy powder 3. Then, deaerate and seal (Fig. 1 (a)). In this state, the 1st V! J(b)+7) As shown below, the capsule is subjected to HIP treatment, and after the HIP treatment is completed, the capsule l and core 4 are removed, and the outer diameter is
The inner diameter of the cylinder is machined to obtain a cylinder inner layer member 2' coated with a corrosion-resistant and wear-resistant alloy coating layer 3' as shown in FIG. 1(C). This cylinder inner layer member 2' is fitted into the cylinder base material 5 prepared separately by means such as shrink fitting or cold shrinkage (Fig. 2).When the cylinder inner layer member 2' reaches normal temperature and pressure, The cylinder inner layer member 2' is in a state of being tightened from the outside by the member 5, and a compressive residual stress is applied to the coating layer 3' on the inner surface of the cylinder inner layer member 2' in the circumferential direction. A cylinder for a plastic molding machine in which such compressive residual stress remains on the inner surface coating layer 3' is subject to high internal pressure (2000 to 2500 kgf/cj) being applied to the cylinder during operation of an injection molding machine or an extrusion molding machine. When tensile stress is applied to the coating layer 3', this tensile stress is canceled out or reduced by the compressive residual stress of the coating layer, and no unreasonable force is generated at the joint between the cylinder inner layer member and the cylinder base material, and the entire cylinder is Increased durability and longer life.
（発明の効果）
以上説明したように本発明によれば、中子を用いたＨＩ
Ｐ処理の単純な工程でシリンダ内面の耐食・耐摩耗合金
層に、使用時のシリンダ内圧による引張応力を打ち消す
ような圧縮残留応力を生じさせておくことにより、高温
（３５０〜５００℃）、高圧（２０００〜２５００ｋｇ
ｆ／ｃｉｊ）の使用条件下においても引張応力がかから
ず、長寿命化を図ることができる効果がある。またＨＩ
Ｐ処理する部材はシリンダ内層部材およびコーティング
層のみであるため、シリンダ母材ごとＨＩＰ処理する場
合に比べ、多数本の部材を１回のＨＩＰ処理で得ること
ができ、それだけコスト低減化が図られる。なお本発明
はプラスチック成形機用のシリンダに限らず、高い内圧
を受ける任意の複合中空構遺物に適用することができる
。(Effects of the Invention) As explained above, according to the present invention, HI using a core
By creating a compressive residual stress in the corrosion-resistant and wear-resistant alloy layer on the inner surface of the cylinder through the simple process of P treatment, which cancels out the tensile stress caused by the cylinder's internal pressure during use, it is possible to (2000~2500kg
f/cij), no tensile stress is applied, and the service life can be extended. Also HI
Since the parts to be P-treated are only the cylinder inner layer parts and the coating layer, a large number of parts can be obtained in one HIP process compared to the case of HIPing the entire cylinder base material, which reduces costs accordingly. . Note that the present invention is not limited to cylinders for plastic molding machines, but can be applied to any composite hollow structure subject to high internal pressure.
第１図（ａ）〜（Ｃ）は本発明の実施例による製造工程
の途中の状態を示した縦断面図、第２図は本発明の実施
例に係るプラスチック成形機用パイメタリックシリンダ
の縦断面図である。
ｌ・・・ＨＩＰ用カプセル、
２．２′・・・シリンダ内層部材、
３・・・耐食・耐摩耗合金粉末、
３′・・・耐食・耐摩耗合金コーティング層、４・・・
中子、５・・・シリンダ母材。
復代理人 弁理士 染 川 利 吉
図（０）1(a) to (C) are longitudinal cross-sectional views showing states in the middle of the manufacturing process according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of a pie metallic cylinder for a plastic molding machine according to an embodiment of the present invention. It is a front view. l... Capsule for HIP, 2.2'... Cylinder inner layer member, 3... Corrosion resistant/wear resistant alloy powder, 3'... Corrosion resistant/wear resistant alloy coating layer, 4...
Core, 5... Cylinder base material. Sub-agent Patent Attorney Yoshizu Somekawa (0)
Claims (1)
グが施されたシリンダ内層部材を、焼きばめまたは冷し
ばめによってシリンダ母材に嵌入し、常温常圧で耐食・
耐摩耗合金コーティング層に圧縮残留応力が付加されて
いることを特徴とするプラスチック成形機用バイメタリ
ックシリンダ。The cylinder inner layer member, whose inner surface has been coated with a corrosion-resistant and wear-resistant alloy through HIP processing, is fitted into the cylinder base material by shrink fit or cold fit, and is corrosion-resistant and wear-resistant at room temperature and pressure.
A bimetallic cylinder for plastic molding machines characterized by compressive residual stress added to the wear-resistant alloy coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038926A JP2683677B2 (en) | 1989-02-18 | 1989-02-18 | Bimetallic cylinder for plastic molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038926A JP2683677B2 (en) | 1989-02-18 | 1989-02-18 | Bimetallic cylinder for plastic molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02217216A true JPH02217216A (en) | 1990-08-30 |
| JP2683677B2 JP2683677B2 (en) | 1997-12-03 |
Family
ID=12538833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1038926A Expired - Lifetime JP2683677B2 (en) | 1989-02-18 | 1989-02-18 | Bimetallic cylinder for plastic molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2683677B2 (en) |
-
1989
- 1989-02-18 JP JP1038926A patent/JP2683677B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2683677B2 (en) | 1997-12-03 |
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