JPH0353002A - Manufacture of sintered cam - Google Patents
Manufacture of sintered camInfo
- Publication number
- JPH0353002A JPH0353002A JP18772889A JP18772889A JPH0353002A JP H0353002 A JPH0353002 A JP H0353002A JP 18772889 A JP18772889 A JP 18772889A JP 18772889 A JP18772889 A JP 18772889A JP H0353002 A JPH0353002 A JP H0353002A
- Authority
- JP
- Japan
- Prior art keywords
- core
- injection
- molded product
- cam
- binder
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000001746 injection moulding Methods 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 238000005245 sintering Methods 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 20
- 238000005238 degreasing Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000004898 kneading Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- 238000000859 sublimation Methods 0.000 claims description 9
- 230000008022 sublimation Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】 く産業上の利用分野） 本発明は、焼結カムの製造方法に関するものである。[Detailed description of the invention] industrial applications) The present invention relates to a method for manufacturing a sintered cam.
（従来の技術及び発明が解決しようとする課題）近年、
自動車用エンジンの高出力化・軽量化に対する要求が増
大する中、この要求に対応すべく中空パイプを用いた軽
量カムシャフトが開発されるようになってきており、一
部で実用化されつつある。このような軽量カムシャフト
において、シャフト部のみならず、カムピース部も軽量
化できれば、軽量化効果をさらに増大せしめ得ることは
自明であるが、焼結カムピースの中空軽量化には、成形
上の困難が伴うところから、未だ実用化されるにに至っ
ていない。(Problems to be solved by conventional techniques and inventions) In recent years,
As the demand for higher output and lighter weight automobile engines increases, lightweight camshafts using hollow pipes are being developed to meet these demands, and are being put into practical use in some cases. . It is obvious that in such a lightweight camshaft, if not only the shaft part but also the cam piece part can be made lighter, the weight reduction effect can be further increased. It has not yet been put into practical use because of the accompanying problems.
さて、金属部品の成形には、要求される形状、コストお
よび材料特性の面から、種々の加工戊形技術が従来から
選択されてきているが、近年、複合部材が得られる、省
資源である等の特徴を有しているところから、粉末冶金
技術が注目されるようになってきている。Now, various processing and forming techniques have traditionally been selected for forming metal parts in terms of required shape, cost, and material properties, but in recent years, resource-saving techniques that allow composite parts to be obtained have been developed. Powder metallurgy technology is attracting attention because of its characteristics such as:
上記粉末冶金技術としては、例えば、金属粉末等を焼結
する焼結法が良く知られている。該焼結法としては、金
属粉末等をプレス成形法、泥しょう鋳込法、押出法、射
出成形法等の方法により所定形状に成形し、しかる後に
焼結し、必要な場合には後加工を施して製品とする方法
が採られている。As the powder metallurgy technique, for example, a sintering method for sintering metal powder is well known. The sintering method involves forming metal powder into a predetermined shape using methods such as press molding, mud casting, extrusion, and injection molding, followed by sintering, and post-processing if necessary. A method is adopted in which the product is manufactured by applying
上記成形法のうち射出成形法では、金属粉末等にバイン
ダを添加して混練してなる射出戊形用原料を所定の金型
内に射出することにより射出戊形品を得るようにしてい
る。この方法では、寸法精度が良く、均質で比較的複雑
な形状の戊形品が大量に得られるという利点があるとこ
ろから、焼結用の成形品を得る方法として、近年特に注
目されるようになってきている。Among the above-mentioned molding methods, in the injection molding method, an injection molded product is obtained by injecting a raw material for injection molding, which is made by adding a binder to metal powder and kneading it, into a predetermined mold. This method has gained particular attention in recent years as a method for obtaining molded products for sintering, as it has the advantage of producing large quantities of molded products with good dimensional accuracy and homogeneous, relatively complex shapes. It has become to.
そこで、本発明者らは、金型射出成形により焼結用の中
空カム成形品を得る方法について種々の試みをなしたと
ころ、特別な工夫を凝らした消失中子を用いる射出成形
法により良好な結果が得られた。Therefore, the present inventors made various attempts to obtain hollow cam molded products for sintering by mold injection molding, and found that an injection molding method using a specially devised vanishing core produced a good product. The results were obtained.
なお、特公昭５８−２５７２３号公報には、カム形状に
成形された焼結用戊形体を中空シャフト部材に圧入嵌合
せしめた後に、焼結処理を施すことによりカムシャフト
を製造する方法について開示されているが、該公知例に
おいては、カムピースを中空構造とする点については全
く考慮されておりません。Note that Japanese Patent Publication No. 58-25723 discloses a method for manufacturing a camshaft by press-fitting a sintering rod shaped into a cam shape into a hollow shaft member and then subjecting it to sintering treatment. However, in this known example, there is no consideration given to the hollow structure of the cam piece.
本発明は、上記の点に鑑みてなされたもので、特殊な消
失中子を使用することにより焼結用の中空射出戊形品を
射出成形し得るようにし、以って焼結中空カムを極めて
容易に製造し得るようにすることを目的とするものであ
る。The present invention has been made in view of the above points, and makes it possible to injection mold a hollow injection molded product for sintering by using a special vanishing core, thereby making it possible to form a sintered hollow cam. The purpose is to make it extremely easy to manufacture.
（課題を解決するための手段）
本発明では、上記課題を解決するための手段として、金
属粉末にバインダを添加して混練してなる射出成形用原
料を、カムピースと同形状の射出成形品を成形すべき金
型内に射出するに先立って、前記カムピースの中空部を
形戊すべく構成され且つ主或分である昇華物質に前記バ
インダと同一戊分を添加してなる消失中子と該消失中子
の軸方向両側端面に配設された金属板とからなる中子ユ
ニットを前記金型内の所定位置にセットし、かくして得
られた射出戊形品に対して脱脂処理を施して前記消失中
子を消失させた後焼結するようにしている。(Means for Solving the Problems) In the present invention, as a means for solving the above problems, an injection molded product having the same shape as a cam piece is manufactured by using an injection molding raw material obtained by adding a binder to metal powder and kneading the mixture. Before being injected into the mold to be molded, a dissipating core is constructed to form the hollow part of the cam piece and is made by adding the same amount as the binder to the main sublimation material. A core unit consisting of metal plates arranged on both axial end faces of the vanishing core is set at a predetermined position in the mold, and the injection molded product thus obtained is degreased and Sintering is performed after the vanishing core has vanished.
（作 用）
本発明では、上記手段により次のような作用が得られる
。(Function) In the present invention, the following effects can be obtained by the above means.
即ち、カムピースの中空部を形戊すべく構成され且つ主
成分である昇華物質に射出成形用バインダと同一成分を
添加してなる消失中子と該消失中子の軸方向両側端面に
配設された金属板とからなる中子ユニットを金型内の所
定位置にセットした状態で焼結用射出戊形品を射出成形
するようしたことにより、焼結前の脱脂処理において射
出戊形品の脱脂と同時に消失中子が焼失せしめられて、
カムピース中空部が形成される。That is, a vanishing core is constructed to form a hollow part of a cam piece and is made of a sublimation material as a main component and the same component as a binder for injection molding, and a vanishing core is provided on both axial end surfaces of the vanishing core. By injection molding the injection molded product for sintering with the core unit consisting of a metal plate set in a predetermined position in the mold, the degreasing of the injection molded product during the degreasing process before sintering is easy. At the same time, the missing core was burnt out,
A cam piece hollow portion is formed.
（発明の効果）
本発明によれば、金属粉末にバインダを添加して混練し
てなる原料を、カムピースと同形状の射出成形品を戊形
すべき金型内に射出するに先立って、前記カムピースの
中空部を形成すべく構戊され且つ主成分である昇華物質
に前記バインダと同ー成分を添加してなる消失中子と該
哨失中子の軸方向両側端面に配設された金属板とからな
る中子ユニノトを前記金型内の所定位置にセノトし、か
くして得られた射出戊形品に対して脱脂処理を施して前
記哨失中子を消失させた後焼結するようにしたので、焼
結前の脱脂処理において射出戊形品の脱脂と同時に消失
中子が焼失せしめられてカムピース中空部が形成される
こととなり、軽量なカムピースを極めて容易に製作する
ことができるという優れた効果がある。(Effects of the Invention) According to the present invention, before injecting a raw material obtained by adding a binder to metal powder and kneading it into a mold to form an injection molded product having the same shape as a cam piece, A vanishing core configured to form a hollow part of a cam piece and made by adding the same component as the binder to a sublimation substance as a main component, and a metal disposed on both axial end surfaces of the vanishing core. A core unit consisting of a plate is placed in a predetermined position in the mold, and the injection molded product thus obtained is subjected to a degreasing treatment to eliminate the core part, and then sintered. Therefore, in the degreasing process before sintering, the core is burnt out at the same time as the injection molded product is degreased, and the hollow part of the cam piece is formed, making it possible to manufacture a lightweight cam piece extremely easily. It has a positive effect.
また、主成分である昇華物質に射出成形用バインダと同
一成分を添加してなる消失中子と該消失中子の軸方向両
側端面に配設された金属板とからなる中子ユニットは、
十分な剛性を保持しているとともに、脱脂処理時のガス
発生も少ないため、射出戊形時における圧力に耐え得る
とともに、戊形部が変形することも少ないという効果も
ある。In addition, a core unit consisting of a vanishing core made by adding the same component as a binder for injection molding to a sublimation substance as a main component, and metal plates arranged on both axial end surfaces of the vanishing core,
Since it maintains sufficient rigidity and generates little gas during degreasing, it can withstand the pressure during injection molding and has the effect that the molded portion is less likely to deform.
（実施例）
以下、添付の図面を参照して本発明の実施例を説明する
。(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
本実施例の焼結カムの製造方法は、第８図図示の工程図
に示す通りの工程により実施される。即ち、金属粉末と
バインダとを混練する混線工程１、混練された原料を所
定形状の金型を用いて射出戊形する射出成形工程２、射
出成形品からバインダを除去する脱脂工程３、バインダ
を除去した後の射出成形品を焼結する焼結工程４および
焼結体の熱処理を行う熱処理工程５を経て所望の焼結カ
ムピースＷ（第６図および第７図参照）が得られるよう
になっているのである。The method for manufacturing the sintered cam of this embodiment is carried out by the steps shown in the process chart shown in FIG. That is, a mixing step 1 involves kneading metal powder and a binder, an injection molding step 2 involves injection molding of the kneaded raw materials using a mold of a predetermined shape, a degreasing step 3 removes the binder from the injection molded product, and a degreasing step 3 removes the binder from the injection molded product. The desired sintered cam piece W (see FIGS. 6 and 7) can be obtained through a sintering step 4 in which the injection molded product after removal is sintered and a heat treatment step 5 in which the sintered body is heat treated. -ing
上記焼結用原料として使用される金属粉末としては、例
えば、粒径２０μ巾の鉄粉（Ｓｉ：０．８重量％、Ｃｒ
：１３．５重量％、Ｍｏ：Ｑ．２重量％、Ｖ：ＣＩ．２
重量％、Ｃ・２．０重量％、Ｆｅ：残部）が使用される
。The metal powder used as the raw material for sintering is, for example, iron powder (Si: 0.8% by weight, Cr
:13.5% by weight, Mo:Q. 2% by weight, V: CI. 2
% by weight, C.2.0% by weight, Fe: balance).
また、上記焼結用原料に添加されるバインダとしては、
例えば、熱可塑性樹脂としてのエチレン酢酸ビニルアル
コールおよびアクリル樹脂と、可塑剤としてのワックス
およびジブチルフタレートと、昇華物質としての昇華性
炭化水素が使用される。In addition, as a binder added to the above raw material for sintering,
For example, ethylene vinyl acetate alcohol and acrylic resins are used as thermoplastic resins, waxes and dibutyl phthalate as plasticizers, and sublimable hydrocarbons as sublimation substances.
しかして、前述の混線工程１においては、前記金属粉末
およびバインダを、下記の如き割合で混練して射出戊形
用原料を調製する。この時の混線温度および時間は、１
２０゜（： ｘ ３０ｍｉｎとされ、溶融されたバイン
ダへ金属粉末を投入することにより行なわれた。Therefore, in the above-mentioned mixing step 1, the metal powder and the binder are kneaded in the following proportions to prepare a raw material for injection molding. The crosstalk temperature and time at this time are 1
The heating time was 20° (: x 30 min), and the metal powder was poured into the molten binder.
金属粉末 ９０重量％エチレン
酢酸ビニルアルコール ３．７ｆｉｌ％アクリル樹脂
２．０重量％ワックス
２．０重量％ジブチルフタレート１．２重
量％
昇華性炭化水素 １．１重量％しかる
後、射出成形工程２においては、上記の如くして調製さ
れた射出戊形用原料を、第１図および第２図図示のカム
ピース成形用金型Ｉ１に射出することによ゛り、カムピ
ース形状の射出成形品ｗ’ （第３図参照）が戊形され
る。Metal powder 90% by weight ethylene vinyl acetate alcohol 3.7fil% acrylic resin
2.0% wax
2.0% by weight Dibutyl phthalate 1.2% by weight Sublimable hydrocarbon 1.1% by weight Thereafter, in injection molding step 2, the raw material for injection molding prepared as described above is By injecting into the cam piece molding die I1 shown in FIG. 2, a cam piece-shaped injection molded product w' (see FIG. 3) is formed.
前記金型１１は、固定型１１ａと該固定型１１ａに対し
て接合・離隔可能とされた可動型１ｌｂとからなってお
り、両者間には、カムピース成形用のキャビティ１２が
形戊されるようになっている。The mold 11 consists of a fixed mold 11a and a movable mold 1lb that can be joined to and separated from the fixed mold 11a, and a cavity 12 for cam piece molding is formed between the two. It has become.
そして、前記固定型１１ａには、前記キャビティｌ２内
にあってカムピースＷにおけるシャフト嵌挿用穴が形或
されるべき部位に突出し、後述する中子ユニット１４を
支持する固定ビン１３が一体に突設されている。The fixed mold 11a is provided with a fixed pin 13 which is located in the cavity l2 and projects into a portion of the cam piece W where a shaft insertion hole is to be formed, and which supports a core unit 14, which will be described later. It is set up.
前記中子ユニット１４は、第４図および第５図図示の如
く、カムピースＷの中空部Ｓを形成すべく構戊され且つ
主成分である昇華物質に前記射出成形用バインダと同一
戊分を添加してなる消失中子ｌ５と該消失中子１５の軸
方向両側端面に配設された金属板１ ６． １ ６（本
実施例では、鉄板）とからなっている。前記消失中子１
５および金属板１６．１６には、前記固定型１１ａに突
設された固定ピン１３を嵌挿すべき通孔１７および１８
，１８がそれぞれ形威されている。該通孔１ ７， １
８には、前記固定ピン１３外周に形或された軸方向に
延びる凸条１３ａが嵌合されるべき凹部１７ａ，１８ａ
が形或されており、前記凸条１３ａへの凹部１７ａ，１
８ａの嵌合により中子ユニソト１４のキャビティｌ２内
での位置決めが行なわれるようになっている。また、前
記消失中子１５の外周には、キャビティｌ２への射出戊
形用原料射出時において射出成形温度により昇華物質が
分解するのを防止すべく熱可塑性樹脂からなる保護層１
９が形成されている。As shown in FIGS. 4 and 5, the core unit 14 is constructed to form the hollow part S of the cam piece W, and is made by adding the same amount as the injection molding binder to the sublimation material, which is the main component. 6. A vanishing core l5 formed by the vanishing core 15 and metal plates 1 disposed on both end faces of the vanishing core 15 in the axial direction. 16 (in this example, iron plates). Said vanishing core 1
5 and the metal plate 16.16 have through holes 17 and 18 into which the fixing pin 13 protruding from the fixing mold 11a is to be inserted.
, 18 are shown in their respective forms. The through hole 1 7, 1
8 includes recesses 17a and 18a into which the axially extending protrusion 13a formed on the outer periphery of the fixing pin 13 is to be fitted.
is formed, and recesses 17a, 1 to the protrusion 13a are formed.
By fitting 8a, the core unisoto 14 is positioned within the cavity l2. Further, a protective layer 1 made of a thermoplastic resin is provided around the outer periphery of the vanishing core 15 in order to prevent the sublimation material from decomposing due to the injection molding temperature when the material for injection molding is injected into the cavity l2.
9 is formed.
上記の如く構成された中子ユニ，ト１４を金型１ｌのキ
ャビティｌ２内にセントするには、可動型１ｌｂを離隔
せしめた状態で、固定型１１ａの固定ビン１３を通孔１
７， １ ８に嵌挿せしめることにより行なわれる。In order to insert the core unit 14 configured as described above into the cavity l2 of the mold 1l, with the movable mold 1lb separated,
This is done by inserting it into the holes 7 and 18.
そして、前述の如く調製された射出成形用原料をキャビ
ティ１２内へ射出することにより、第３図図示の射出成
形品Ｗ′が得られた。この時の射出成形条件は、射出圧
力：２４３０ｋｇ・ｒ／ｃｍ”、射出温度：９０℃、戊
形時間：１ｍｉｎであった。Then, by injecting the raw material for injection molding prepared as described above into the cavity 12, an injection molded product W' shown in FIG. 3 was obtained. The injection molding conditions at this time were injection pressure: 2430 kg·r/cm'', injection temperature: 90° C., and shaping time: 1 min.
上記の如くして得られた射出成形品Ｗ′に対して、脱脂
工程３において、窒素雰囲気中（５ａｔｍ）にて、６０
０°Ｃ Ｘ ５ｈｒ， １０゜Ｃ／ｈｒの昇温により脱
脂処理を施して、射出戊形品Ｗ′中のバインダを飛ばす
とともに、消失中子１５を焼失せしめる。従って、射出
成形品Ｗ′内に中空部分が形成されることとなる。In the degreasing step 3, the injection molded product W' obtained as described above was heated at 60° C. in a nitrogen atmosphere (5 atm).
A degreasing treatment is performed by increasing the temperature at 0°C x 5hr, 10°C/hr to blow off the binder in the injection molded product W' and burn out the vanishing core 15. Therefore, a hollow portion is formed within the injection molded product W'.
しかる後、前記射出成形品Ｗ′に対して焼結工程４にお
いて、１１１０゜Ｃｘ ３Ｇｍｉｎ（真空中）にて焼結
を行ったところ、第６図および第７図図示の如き焼結カ
ムピースＷが得られた。この工程において、焼結成形部
Ｗ１は、金属板１ ６． １ ６と焼結締め、拡散接合
されて固定される。Thereafter, in the sintering step 4, the injection molded product W' was sintered at 1110°C x 3Gmin (in vacuum), resulting in a sintered cam piece W as shown in FIGS. 6 and 7. Obtained. In this step, the sintered forming portion W1 is formed by forming the metal plate 16. 1 6 and is sintered and fixed by diffusion bonding.
上記の如くして得られた焼結カムピースＷに対しては、
熱処理工程５において、焼入れ（９００°ＣＸ３０＋＋
＋ｉｎ→油冷）および焼戻し（５５０Ｘ ｌ００ｍｉｎ
→油冷）が施される。For the sintered cam piece W obtained as above,
In heat treatment step 5, quenching (900°C
+in → oil cooling) and tempering (550X l00min
→oil cooling) is applied.
かくして得られた焼結カムピースＷは、高強度材（例え
ば、ＳＴＫＭ１６Ａ）からなる中空シャフトＰの所定位
置に固定接合される。この時、中空シャフトＰへのカム
ピースＷの位置決めは、該中空シャフ｝Ｐ外周に形成さ
れた凸部Ｐ．に対してカムピースＷの金属板１ ６．
１ ６に形戊された凹部１８ａ，１８ａを嵌合せしめる
ことにより行なわれる。The sintered cam piece W thus obtained is fixedly joined to a predetermined position of a hollow shaft P made of a high-strength material (for example, STKM16A). At this time, the positioning of the cam piece W on the hollow shaft P is performed using a convex portion P. formed on the outer periphery of the hollow shaft P. Metal plate 1 of cam piece W against 6.
This is done by fitting the recesses 18a, 18a each having a shape of 1 to 6.
上記の如くしたことにより、本実施例の場合、焼結前の
脱脂処理において射出成形品Ｗ′の脱脂と同時に消失中
子１５が焼失せしめられてカムピース中空部Ｓが形成さ
れることとなり、軽量なカムピースＷが極めて容易に製
作される。また、本実施例によれば、主戊分である昇華
物質に射出戊形用バインダと同一成分を添加してなる消
失中子ｌ５と該消失中子１５の軸方向両側端面に配設さ
れた金属板１ ６． １ ６とからなる中子ユニット１
４が、十分な剛性を保持しているとともに、脱脂処理時
のガス発生も少ないところから、射出成形時における圧
力に十分劇え得るとともに、成形品の変形防止をも図れ
る。By doing the above, in the case of this embodiment, in the degreasing treatment before sintering, the vanishing core 15 is burned out at the same time as the injection molded product W' is degreased, and the cam piece hollow part S is formed, and the cam piece is lightweight. The cam piece W can be manufactured very easily. Further, according to this embodiment, there is a vanishing core 15 made by adding the same component as the binder for injection molding to the sublimation material which is the main fraction, and a vanishing core 15 disposed on both end faces in the axial direction of the vanishing core 15. Metal plate 1 6. Core unit 1 consisting of 1 and 6
4 maintains sufficient rigidity and generates little gas during degreasing treatment, so it can sufficiently handle the pressure during injection molding and also prevents deformation of the molded product.
第１図は本発明の焼結カムの製造方法に使用される射出
成形用金型の要部断面図、第２図は第ｌ図の■一■断面
図、第３図は射出成形品の断面図、第４図は中子ユニッ
トの断面図、第５図は中子ユニットの平面図、第６図は
本発明方法により製造された焼結カムピースを中空シャ
フトに固定した状態を示す断面図、第７図は第６図のＸ
矢視図、第８図は本発明の焼結カムの製造方法における
工程順序図である。
１ｌ・・・・・・
ｌ２・・・・・・
ｌ３・・・・・・
１４・・●・・・
１５・・・・・・
１６・・・・・・
Ｗ・ ■ ・ ・ ・ ・
Ｗ′ ・・・・・・
Ｓ・・・・・・・
・金型
・キャビテイ
・固定ビン
・中子ユニット
・消失中子
・金属板（鉄板）
・カムピース
・射出成形品
・中空部
黛翠
キャビティ
固定ビン
中子ユニノト
消失中子
公属板（鉄阪）
ノＪムピース
Ｑ４出成形品
中空部Figure 1 is a cross-sectional view of the main parts of an injection mold used in the method of manufacturing a sintered cam of the present invention, Figure 2 is a cross-sectional view of Figure I, and Figure 3 is a cross-sectional view of the injection molded product. 4 is a sectional view of the core unit, FIG. 5 is a plan view of the core unit, and FIG. 6 is a sectional view showing a state in which a sintered cam piece manufactured by the method of the present invention is fixed to a hollow shaft. , Figure 7 shows the X in Figure 6.
The arrow view and FIG. 8 are process sequence diagrams in the method for manufacturing a sintered cam of the present invention. 1l... l2... l3... 14...●... 15... 16... W・ ■ ・ ・ ・ ・ W ′ ・・・・・・ S・・・・・・ ・Mold, cavity, fixed bottle, core unit, vanishing core, metal plate (iron plate) ・Cam piece, injection molded product, hollow part Mayuzui cavity fixed Bottle core UNINOTO lost core public board (Tetsusaka) NoJmu piece Q4 extrusion molded product hollow part
Claims (1)
形用原料を、カムピースと同形状の射出成形品を成形す
べき金型内に射出するに先立って、前記カムピースの中
空部を形成すべく構成され且つ主成分である昇華物質に
前記バインダと同一成分を添加してなる消失中子と該消
失中子の軸方向両側端面に配設された金属板とからなる
中子ユニットを前記金型内の所定位置にセットし、かく
して得られた射出成形品に対して脱脂処理を施して前記
消失中子を消失させた後焼結することを特徴とする焼結
カムの製造方法。1. Before injecting an injection molding raw material made by adding a binder to metal powder and kneading it into a mold in which an injection molded product having the same shape as the cam piece is to be molded, a hollow part of the cam piece is formed. A core unit consisting of a dissipation core made of a sublimation material as a main component and the same component as the binder added thereto, and metal plates disposed on both axial end surfaces of the dissipation core. A method for producing a sintered cam, which comprises setting the injection molded product at a predetermined position in a mold, degreasing the injection molded product thus obtained to eliminate the vanishing core, and then sintering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18772889A JPH0353002A (en) | 1989-07-19 | 1989-07-19 | Manufacture of sintered cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18772889A JPH0353002A (en) | 1989-07-19 | 1989-07-19 | Manufacture of sintered cam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0353002A true JPH0353002A (en) | 1991-03-07 |
Family
ID=16211142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18772889A Pending JPH0353002A (en) | 1989-07-19 | 1989-07-19 | Manufacture of sintered cam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0353002A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000016935A1 (en) * | 1998-09-18 | 2000-03-30 | Injex Corporation | Method of forming undercut in metal powder injection-molded article and metal powder injection-molded article having undercut |
| KR100766294B1 (en) * | 2005-11-17 | 2007-10-11 | 주식회사 태멘시스템 | Automatic gas ventilation apparatus and method thereof |
-
1989
- 1989-07-19 JP JP18772889A patent/JPH0353002A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000016935A1 (en) * | 1998-09-18 | 2000-03-30 | Injex Corporation | Method of forming undercut in metal powder injection-molded article and metal powder injection-molded article having undercut |
| US6444167B1 (en) | 1998-09-18 | 2002-09-03 | Injex Corporation | Method of forming undercut in metal powder injection-molded article |
| KR100766294B1 (en) * | 2005-11-17 | 2007-10-11 | 주식회사 태멘시스템 | Automatic gas ventilation apparatus and method thereof |
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