JP2927905B2 - Molding method of vanishing model for hollow camshaft - Google Patents
Molding method of vanishing model for hollow camshaftInfo
- Publication number
- JP2927905B2 JP2927905B2 JP20414890A JP20414890A JP2927905B2 JP 2927905 B2 JP2927905 B2 JP 2927905B2 JP 20414890 A JP20414890 A JP 20414890A JP 20414890 A JP20414890 A JP 20414890A JP 2927905 B2 JP2927905 B2 JP 2927905B2
- Authority
- JP
- Japan
- Prior art keywords
- model
- vanishing
- hollow
- hollow camshaft
- vanishing model
- 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
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 内燃機関に使用する中空カム軸を鋳造する場合に用い
られる中空カム軸用消失模型の成型方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for molding a vanishing model for a hollow camshaft used in casting a hollow camshaft used in an internal combustion engine.
従来、内燃機関に用いられるカム軸は、鍛造や鋳造等
で製造されたものがあるが、鍛鋼品は鋳鉄品に比べて重
いために、内燃機関の軽量化が要請される今日にあって
は適していない。そこで、鋳造によってカム軸を製造す
るのだが、さらにこのカム軸の軸心部分を中空化するよ
うにしており、そのためには鋳型の中心位置に砂中子又
は金属管を配設している。砂中子や金属管の中で長軸状
のものは、鋳型内で芯ずれを抑えるためにケレンを使用
してこの砂中子や金属管支持をしている。特に、一方端
側が閉塞された中空カム軸を製造するためには、砂中子
や金属管を支持するために多くの特殊なケレンを必要と
している。Conventionally, camshafts used in internal combustion engines are manufactured by forging or casting, but forged steel products are heavier than cast iron products. Not suitable. Therefore, the camshaft is manufactured by casting. In addition, the center of the camshaft is hollowed out. For this purpose, a sand core or a metal tube is disposed at the center of the mold. Among the sand cores and metal pipes, those having a long axis are supported with the sand cores and metal pipes by using kerosene in order to suppress misalignment in the mold. In particular, in order to manufacture a hollow camshaft with one end closed, many special kerens are required to support a sand core and a metal tube.
しかしながら、このように鋳型内に砂中子や金属管を
配設して溶湯を鋳込んで中空カム軸を製造する場合に
は、前記したように多くのケレンで前記砂中子や金属管
を支持しなければならず、煩雑であるという問題点があ
る。特に、前記したように特殊なケレンが必要な場合に
は、この特殊なケレンを別途製作しなければならず、こ
のためのコストがかかることになる。また、砂中子を用
いて中空カム軸を製造した場合には、ショットブラスト
等によってこの中空カム軸に振動を与え、砂中子を壊し
てこれを除去しなければならず、煩雑であるとともに中
空部から砂を完全に除去できないという問題点があっ
た。However, in the case where a hollow core is manufactured by casting a molten metal by arranging a sand core or a metal pipe in a mold as described above, the sand core or the metal pipe is formed with a lot of keren as described above. There is a problem that it must be supported and is complicated. In particular, as described above, when a special keren is required, the special keren must be separately manufactured, which increases the cost. Further, when a hollow camshaft is manufactured using a sand core, the hollow camshaft must be vibrated by shot blasting or the like to break and remove the sand core, which is complicated and There was a problem that sand could not be completely removed from the hollow portion.
このような課題を解決するために、本発明にあって
は、金属管の両端部を模型用金型内に形成した支持部に
支持させ、この模型金型内に消失用発泡材を入れて前記
金属管が中心に位置する中空カム軸の消失模型を成型す
るようにしたものである。または、金属管の少くとも一
端を消失部材を介して模型用金型に支持させ、他端を模
型用金型内に形成した支持部で支持し、この模型用金型
内に消失発泡材を入れて前記金属管が中心に位置すると
ともに少くとも一端が前記消失部材によって閉塞された
中空カム軸の消失模型を成型するようにしたものであ
る。In order to solve such a problem, in the present invention, both ends of the metal tube are supported by supporting portions formed in a model mold, and a disappearing foam material is put in the model mold. The vanishing model of the hollow camshaft in which the metal tube is located at the center is molded. Alternatively, at least one end of the metal tube is supported by the model mold via the disappearing member, and the other end is supported by the support formed in the model mold. The metal tube is placed at the center, and at least one end of the hollow tube is closed by the vanishing member to form a vanishing model of the hollow camshaft.
消失模型を鋳枠内の鋳物砂に埋設して造型し、湯口か
ら消失模型へ溶湯を鋳込めば、中空カム軸が鋳造され
る。When the lost model is buried in the molding sand in the casting frame and molded, and the molten metal is poured into the lost model from the gate, a hollow camshaft is cast.
または、一方端が閉塞された消失模型を鋳物砂に埋設
して造型し、湯口から溶湯を鋳込めば一方端が閉塞され
た中空カム軸が鋳造される。Alternatively, the vanishing model whose one end is closed is buried in molding sand to form a mold, and if a molten metal is cast from a gate, a hollow camshaft whose one end is closed is cast.
以下、本発明を図面に基づいて説明する。第1図およ
び第2図はこの発明に係る中空カム軸用消失模型の成型
方法を示す図である。Hereinafter, the present invention will be described with reference to the drawings. 1 and 2 are views showing a method for molding a vanishing model for a hollow camshaft according to the present invention.
まず、中空カム軸の製造は消失模型を用いた鋳造法に
よって行っている。この鋳造法は、発泡ポリスチレン製
の消失模型を成型し、この消失模型に溶湯を鋳込んで中
空カム軸を製造するものである。First, the hollow camshaft is manufactured by a casting method using a vanishing model. In this casting method, a hollow camshaft is manufactured by molding a disappearing model made of expanded polystyrene and casting a molten metal into the disappearing model.
この鋳造法における中空カム軸用消失模型の成型方法
を説明する。第1図において、符号1,2は一対の模型用
金型であり、この模型用金型1,2の内壁面4,5の形状は内
燃機関に用いられるカム軸の形状をしており、また内壁
面4,5の両端にはステンレス鋼管3の両端を支持するた
めにこのステンレス鋼管3と同じ形状をした支持部4a,5
a,4b,5bが形成されている。模型用金型1,2内にはステン
レス鋼管3が配設され、このステンレス鋼管3の両端部
3a,3bは支持部4a,5a,4b,5bによって支持される。ステン
レス鋼管3には耐火材料としての黒鉛(図示せず)がコ
ーティングされている。ステンレス鋼管3が配設された
後、模型用金型1,2内には発泡ポリスチレンのビーンズ
6が入れられる。A method for molding a vanishing model for a hollow cam shaft in this casting method will be described. In FIG. 1, reference numerals 1 and 2 denote a pair of model dies, and the shapes of inner wall surfaces 4 and 5 of the model dies 1 and 2 have a shape of a cam shaft used in an internal combustion engine. Support portions 4a, 5 having the same shape as the stainless steel tube 3 are provided at both ends of the inner wall surfaces 4, 5 to support both ends of the stainless steel tube 3.
a, 4b, 5b are formed. Stainless steel pipes 3 are provided in the mold dies 1 and 2, and both ends of the stainless steel pipes 3 are provided.
3a, 3b are supported by the support portions 4a, 5a, 4b, 5b. The stainless steel pipe 3 is coated with graphite (not shown) as a refractory material. After the stainless steel tube 3 is provided, the expanded polystyrene beads 6 are placed in the molds 1 and 2 for the models.
模型用金型1,2を加熱すると、ビーンズ6が発泡して
第2図に示すような内部にステンレス鋼管3を有する発
泡ポリスチレン製の消失模型7が成型される。模型用金
型1,2を開けて、中から消失模型7を取り出し、この消
失模型7から突出したステンレス鋼管3の両端部3a,3b
をカッター等によって切除する。次に、消失模型7を鋳
枠内の鋳物砂に埋設し造型するのだか、この消失模型7
はステンレス鋼管3を有しているので、前記造型の際に
曲りが生じるようなことはない。このときに、消失模型
7を鋳物砂に埋設すれば、中空カム軸の中空部分を構成
するステンレス鋼管3は消失模型7に包持されているの
で、従来におけるケレン等を用いる必要はない。When the model dies 1 and 2 are heated, the beads 6 are foamed to form the disappearing model 7 made of expanded polystyrene having the stainless steel tube 3 inside as shown in FIG. The molds 1 and 2 for the model are opened, and the vanishing model 7 is taken out from the inside, and both ends 3a and 3b of the stainless steel tube 3 protruding from the vanishing model 7 are opened.
Is cut off with a cutter or the like. Next, the lost model 7 is buried in the molding sand in the casting flask and molded.
Has a stainless steel pipe 3 so that no bending occurs during the molding. At this time, if the vanishing model 7 is buried in the casting sand, the stainless steel pipe 3 constituting the hollow portion of the hollow cam shaft is covered by the vanishing model 7, so that there is no need to use conventional keren or the like.
次に、湯口から消失模型7へ球状黒鉛鋳鉄等の溶湯を
鋳込めば、中空カム軸が鋳造され、その後ステンレス鋼
管3を引き出す。なお、鋳造時の溶湯の熱影響によるス
テンレス鋼管3のねじれを防止するために、このステン
レス鋼管3内にステンレス鋼棒を入れてもよい。ところ
で、前記中空部分を形成するために砂中子を用いた場合
には、ショットブラスト等によって中空カム軸に振動を
与え、中空部から砂を除去するといった作業が必要だ
が、消失模型7を用いた場合にはこのような作業が不要
となって簡便となる。Next, if a molten metal such as spheroidal graphite cast iron is cast into the vanishing model 7 from the gate, a hollow cam shaft is cast, and then the stainless steel pipe 3 is pulled out. In order to prevent the stainless steel pipe 3 from being twisted due to the thermal influence of the molten metal at the time of casting, a stainless steel rod may be inserted into the stainless steel pipe 3. By the way, when a sand core is used to form the hollow portion, it is necessary to vibrate the hollow cam shaft by shot blasting or the like to remove sand from the hollow portion. In such a case, such a work becomes unnecessary and the operation becomes simple.
次に、本発明の第2実施例を第3図および第4図に示
して説明する。なお、第1実施例と同一部材には同一符
号を付してその説明は省略する。第3図において、模型
用金型1,2の内壁面4,5の一端には支持部4a,5aが形成さ
れているが、他端は発泡ポリスチレン等からなる消失部
材11を支持するための支持部4b,5bが形成されている。
消失部材11にはステンレス鋼管3の一方端3bを支持する
ための支持穴11aが形成されている。この支持穴11aには
金属栓12によって閉鎖された一方端3bを有するステンレ
ス鋼管3を圧入して、消失部材11が取り付けられたステ
ンレス鋼管3を模型用金型1,2に配設する。Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 3, support portions 4a and 5a are formed at one end of the inner wall surfaces 4 and 5 of the model molds 1 and 2, while the other end is for supporting a disappearing member 11 made of expanded polystyrene or the like. Support portions 4b and 5b are formed.
The disappearing member 11 has a support hole 11a for supporting one end 3b of the stainless steel tube 3. A stainless steel tube 3 having one end 3b closed by a metal stopper 12 is press-fitted into the support hole 11a, and the stainless steel tube 3 to which the disappearing member 11 is attached is arranged in the model dies 1 and 2.
次に、第1実施例と同様にして、第4図に示すような
消失模型13を成型するが、この消失模型13は一方端は消
失部材11によって閉塞された形状となっている。次に、
第1実施例と同様に溶湯を鋳込めば、一方端が閉塞され
た中空カム軸が鋳造される。この中空カム軸のカム部や
ジャーナル部等に油孔をドリルによって切削する。中空
カム軸の中空部に潤滑油を導入することによって、前記
油孔からこの潤滑油を前記カム部やジャーナル部に案内
する。このように、一方端が閉塞された中空カム軸を鋳
造するために、従来の特殊なケレンを用いる必要がない
ので簡便となり、製造コストも安くすることができる。Next, a vanishing model 13 as shown in FIG. 4 is formed in the same manner as in the first embodiment, and the vanishing model 13 has one end closed by the vanishing member 11. next,
When the molten metal is cast as in the first embodiment, a hollow camshaft having one end closed is cast. An oil hole is cut in a cam portion, a journal portion, and the like of the hollow cam shaft by a drill. By introducing lubricating oil into the hollow portion of the hollow camshaft, the lubricating oil is guided from the oil hole to the cam portion and the journal portion. As described above, since it is not necessary to use a conventional special keren in order to cast a hollow camshaft whose one end is closed, it is simple and the manufacturing cost can be reduced.
以上説明したように本発明によれば、金属管の両端部
を模型用金型内に形成した支持部に支持させ、この模型
用金型内に消失用発泡材を入れて前記金属管が中心に位
置する中空カム軸の消失模型を成型するようにしたの
で、消失模型を鋳物砂に埋設すれば、中空カム軸の中空
部分を構成するステンレス鋼管は消失模型に包持されて
いるので、従来におけるケレン等を用いる必要はない。
また、前記中空部分を形成するために砂中子を用いた場
合に、ショットブラスト等によって中空カム軸に振動を
与えたり、中空部から砂を除去するといった作業が不要
となり、簡便となる。As described above, according to the present invention, both ends of the metal tube are supported by the supporting portions formed in the model mold, and a foaming material for disappearing is put in the model mold so that the metal tube is centered. As the vanishing model of the hollow camshaft located in is designed to be molded, if the vanishing model is buried in casting sand, the stainless steel tube that constitutes the hollow part of the hollow camshaft is enclosed by the vanishing model, so It is not necessary to use Keren or the like.
Further, when a sand core is used to form the hollow portion, there is no need to perform operations such as applying vibration to the hollow cam shaft by shot blasting or removing sand from the hollow portion.
または、金属管の少くとも一端を消失部材を介して模
型用金型に支持させ、他端を模型用金型内に形成した支
持部で支持し、この模型用金型内に消失発泡材を入れて
前記金属管が中心に位置するとともに、少くとも一端が
前記消失部材によって閉塞された中空カム軸の消失模型
を成型するようにしたので、溶湯を鋳込めば一方端が閉
塞された中空カム軸が鋳造され、従来の特殊なケレンを
用いる必要がないので簡便となり、製造コストも安くす
ることができる。Alternatively, at least one end of the metal tube is supported by the model mold via the disappearing member, and the other end is supported by the support formed in the model mold. The metal pipe is located at the center, and a vanishing model of a hollow cam shaft at least one end of which is closed by the vanishing member is molded. Since the shaft is cast and there is no need to use a conventional special keren, it is simple and the manufacturing cost can be reduced.
第1図および第2図は本発明に係る中空カム軸用消失模
型の成形方法の第1実施例を示す図であり、第1図は模
型用金型の断面図、第2図は消失模型の断面図、第3図
および第4図は本発明に係る中空カム軸用消失模型の成
形方法の第2実施例を示す図であり、第3図は模型用金
型の断面図、第4図は消失模型の断面図である。 1,2……模型用金型、 3……ステンレス鋼管、 4a,5a,4b,5b……支持部、 7,12……消失模型、 11……消失部材。1 and 2 are views showing a first embodiment of a method for forming a vanishing model for a hollow camshaft according to the present invention. FIG. 1 is a sectional view of a model die, and FIG. 2 is a vanishing model. FIGS. 3 and 4 are views showing a second embodiment of the method for forming a vanishing model for a hollow camshaft according to the present invention, and FIG. 3 is a cross-sectional view of a model die. The figure is a sectional view of the vanishing model. 1,2 ... model mold, 3 ... stainless steel tube, 4a, 5a, 4b, 5b ... support, 7,12 ... vanishing model, 11 ... vanishing member.
Claims (2)
支持部に支持させ、この模型用金型内に消失用発泡材を
入れて前記金属管が中心に位置する中空カム軸の消失模
型を成型するようにしたことを特徴とする中空カム軸用
消失模型の成型方法。1. A hollow camshaft in which both ends of a metal tube are supported by supporting portions formed in a model mold, and a vanishing foam material is placed in the model mold so that the metal tube is positioned at the center. A method for molding a vanishing model for a hollow camshaft, wherein the vanishing model is molded.
模型用金型に支持させ、他端を模型用金型内に形成した
支持部で支持し、この模型用金型内に消失発泡材を入れ
て前記金属管が中心に位置するとともに少くとも一端が
前記消失部材によって閉塞された中空カム軸の消失模型
を成型するようにしたことを特徴とする中空カム軸用消
失模型の成型方法。At least one end of the metal tube is supported by a model mold via a vanishing member, and the other end is supported by a support formed in the model mold and vanes into the model mold. Molding a vanishing model for a hollow camshaft, wherein a foaming material is put in and the metal tube is positioned at the center and at least one end is molded by a vanishing model of a hollow camshaft closed by the vanishing member. Method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20414890A JP2927905B2 (en) | 1990-07-31 | 1990-07-31 | Molding method of vanishing model for hollow camshaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20414890A JP2927905B2 (en) | 1990-07-31 | 1990-07-31 | Molding method of vanishing model for hollow camshaft |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0489154A JPH0489154A (en) | 1992-03-23 |
JP2927905B2 true JP2927905B2 (en) | 1999-07-28 |
Family
ID=16485633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20414890A Expired - Fee Related JP2927905B2 (en) | 1990-07-31 | 1990-07-31 | Molding method of vanishing model for hollow camshaft |
Country Status (1)
Country | Link |
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JP (1) | JP2927905B2 (en) |
Cited By (1)
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---|---|---|---|---|
KR20230102411A (en) * | 2021-12-30 | 2023-07-07 | 성보 피앤티 주식회사 | Center hole machining method for shafts for heavy equipment |
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JP2007054841A (en) * | 2005-08-22 | 2007-03-08 | Mie Katan Kogyo Kk | Method for manufacturing die for forming foam product model to be used in disposable model casting process |
JP2007061826A (en) * | 2005-08-29 | 2007-03-15 | Mie Katan Kogyo Kk | Method for casting cast product by evaporative pattern casting method, and method for manufacturing metallic mold for forming foamed product pattern |
CN107529462B (en) * | 2017-08-03 | 2019-08-23 | 青岛兆玉启机械有限公司 | A kind of lost-foam casting method with complex surface structures casting |
CN107520404B (en) * | 2017-08-03 | 2019-06-14 | 日照市方进金属制品有限公司 | A kind of prefabricated metal part for evaporative pattern |
CN108637177A (en) * | 2018-05-25 | 2018-10-12 | 浙江东音泵业股份有限公司 | A kind of deformable casting aluminum rotor mold |
-
1990
- 1990-07-31 JP JP20414890A patent/JP2927905B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230102411A (en) * | 2021-12-30 | 2023-07-07 | 성보 피앤티 주식회사 | Center hole machining method for shafts for heavy equipment |
KR102558053B1 (en) * | 2021-12-30 | 2023-08-01 | 성보 피앤티(주) | Center hole machining method for shafts for heavy equipment |
Also Published As
Publication number | Publication date |
---|---|
JPH0489154A (en) | 1992-03-23 |
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