JPH07299554A - Die for casting aluminum provided with core pin - Google Patents
Die for casting aluminum provided with core pinInfo
- Publication number
- JPH07299554A JPH07299554A JP6093367A JP9336794A JPH07299554A JP H07299554 A JPH07299554 A JP H07299554A JP 6093367 A JP6093367 A JP 6093367A JP 9336794 A JP9336794 A JP 9336794A JP H07299554 A JPH07299554 A JP H07299554A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- pin
- die
- mold
- aluminum
- 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
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミニウムの鋳造に用
いる鋳抜きピンを備えたアルミニウム鋳造用金型に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum casting mold having a die-cast pin used for casting aluminum.
【０００２】[0002]
【従来の技術】アルミニウム鋳造を行う場合、アルミニ
ウム溶湯は極めて活性であるので、アルミニウム合金の
溶湯で鋳造サイクルを連続的に行うと、鋳抜きピンは接
触によって化学的な浸食や溶着を受け、浸食による破損
や溶着による鋳造品とのかじり等を生じる。そこで、図
４に示すように可動型１００に固着した鋳抜きピン１０
１の抜き勾配部１０１ａに１／５０程度の勾配を形成し
て鋳造品からの離型性を向上することが知られている。2. Description of the Related Art When performing aluminum casting, molten aluminum is extremely active. Therefore, when the casting cycle is continuously performed with molten aluminum alloy, the casting pin undergoes chemical erosion or welding due to contact, which causes erosion. It causes damage and galling with casting due to welding. Therefore, as shown in FIG. 4, the die-cast pin 10 fixed to the movable die 100.
It is known that a 1/50 gradient is formed in the first draft portion 101a to improve the releasability from the cast product.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来のアルミ
ニウム鋳造用鋳抜きピンのように１／５０程度の勾配を
形成した場合、例えば転造ネジを切るためには、所定の
公差の下穴をドリル加工する必要があり、工数が増加す
る。また、可動型１００に固着されているので、固定型
１０２との間に隙間が生じ、ここに膜バリが発生する。When a gradient of about 1/50 is formed like the above-mentioned conventional die-cast pin for aluminum casting, in order to cut, for example, a rolling screw, a prepared hole having a predetermined tolerance is formed. Drilling is required, increasing man-hours. Further, since it is fixed to the movable mold 100, a gap is created between the movable mold 100 and the fixed mold 102, and a film burr is generated here.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決すべく本
発明に係る鋳造用金型は、鋳抜きピンに形成する抜き勾
配部の勾配を１／３００〜１／１０００とし、且つ抜き
勾配部の先端の小径部の径を本来形成すべき下穴の径か
ら公差分を引いた寸法に収まるようにし、また抜き勾配
部の基端の大径部の径を本来形成すべき下穴の径に公差
分を足した寸法に収まるようにした。In order to solve the above-mentioned problems, a casting mold according to the present invention has a draft gradient portion formed on a casting pin with a gradient of 1/300 to 1/1000 and a draft gradient portion. The diameter of the small diameter part at the tip of the is set to be a size obtained by subtracting the tolerance from the diameter of the prepared hole to be originally formed, and the diameter of the large diameter part at the base end of the draft portion is the diameter of the prepared hole to be originally formed. I made it so that it fits within the size of the tolerance.
【０００５】[0005]
【作用】鋳抜きピンの抜き勾配が１／３００〜１／１０
００に形成され、且つ抜き勾配部の小径部及び大径部の
寸法が下穴の公差内に収まるようにしているので、下穴
加工を省略してネジ加工を行うことができる。Function: The draft angle of the casting pin is 1/300 to 1/10
00, and the small-diameter portion and the large-diameter portion of the draft portion are set within the tolerance of the prepared hole, so that the prepared hole can be omitted and screw processing can be performed.
【０００６】[0006]
【実施例】以下本発明の実施例を添付図面に基づいて説
明する。ここで、図１は本発明に係るアルミニウム鋳造
用金型の断面図、図２は本発明に係るアルミニウム鋳造
用金型に適用する鋳抜きピンの側面図、図３は別実施例
に係るアルミニウム鋳造用金型の要部断面図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view of an aluminum casting mold according to the present invention, FIG. 2 is a side view of a casting pin applied to the aluminum casting mold according to the present invention, and FIG. 3 is an aluminum according to another embodiment. It is an important section sectional view of a metallic mold for casting.
【０００７】アルミニウム鋳造用金型は固定型１及び可
動型２からなり、これらの固定型１及び可動型２はそれ
ぞれホルダ３，４に固着されている。そして、これら固
定型１及び可動型２には、鋳抜きピン１０を進退可能に
挿通し、鋳抜きピン１０の後端を連結板５に固定連結
し、この連結板５を駆動部材である油圧シリンダ６にて
進退動可能に配設している。The aluminum casting mold comprises a fixed mold 1 and a movable mold 2. These fixed mold 1 and movable mold 2 are fixed to holders 3 and 4, respectively. Then, the casting pin 10 is inserted into the fixed mold 1 and the movable mold 2 so as to be able to move forward and backward, and the rear end of the casting pin 10 is fixedly connected to the connecting plate 5, and the connecting plate 5 is a hydraulic member serving as a hydraulic member. The cylinder 6 is arranged so that it can move back and forth.
【０００８】また、可動型２には押出しピン７を進退可
能に挿通し、この押出しピン７の後端を連結板８に固定
連結し、図示しない油圧シリンダにて進退させるように
している。Further, the push pin 7 is inserted into the movable die 2 so as to be able to move forward and backward, and the rear end of the push pin 7 is fixedly connected to the connecting plate 8 so that it can be moved forward and backward by a hydraulic cylinder (not shown).
【０００９】ここで、アルミニウム鋳造用鋳抜きピン１
０は、図２に示すように先半部に抜き勾配部１０ａを設
け、この抜き勾配部１０ａの抜き勾配を１／３００〜１
／１０００の範囲内で形成し、抜き勾配部１０ａの先端
の小径部の径（ｄ）は本来形成すべき下穴の径から公差
分を引いた寸法に収まるようにし、また抜き勾配部１０
ａの基端の大径部の径（Ｄ）は本来形成すべき下穴の径
に公差分を足した寸法に収まるようにする。具体的に
は、鋳抜きピン１０の抜き勾配が１／５５０になるよう
に形成し、例えばＭ８のネジ穴を切る場合、下穴の公差
が０．１５ｍｍであるので、穴の全長Ｌが２８ｍｍのと
き、鋳抜きピン１０の大径側の径Ｄをφ７．３５ｍｍ、
小径側の径ｄをφ７．２５ｍｍとして、ドリルによる後
加工をしなくともＭ８にネジが切れるようにしている。Here, the cast pin 1 for aluminum casting
In the case of 0, a draft portion 10a is provided in the first half as shown in FIG. 2, and the draft of the draft portion 10a is 1/300 to 1
The diameter (d) of the small-diameter portion at the tip of the draft portion 10a is set within a range obtained by subtracting a tolerance from the diameter of the prepared hole to be originally formed.
The diameter (D) of the large-diameter portion at the base end of a is set to be a dimension obtained by adding a tolerance to the diameter of the prepared hole to be originally formed. Specifically, when the casting pin 10 is formed to have a draft of 1/550 and, for example, a M8 screw hole is cut, the prepared hole has a tolerance of 0.15 mm, so the total length L of the hole is 28 mm. At this time, the diameter D on the large diameter side of the casting pin 10 is φ7.35 mm,
The diameter d on the small diameter side is set to φ7.25 mm so that the screw can be cut into M8 without post-processing with a drill.
【００１０】この鋳抜きピン１０としては、アルミニウ
ム溶湯に対して耐食性を有する材料或いは耐食性を有す
る材料で被覆したもの、例えば、チタン材からなるピン
の表面に窒化処理を施して表面硬化層を形成したもの、
或いは鋼製のピン表面を硬質炭素膜で被覆したもの、等
を用いて鋳造時のアルミニウム溶湯の溶着をできる限り
少なくし、離型時の鋳造品とのかじりを防止するように
している。The casting pin 10 is a pin coated with a material having corrosion resistance to the molten aluminum or a material having corrosion resistance, for example, a pin made of titanium material is subjected to a nitriding treatment to form a surface hardened layer. What you did
Alternatively, a steel pin surface coated with a hard carbon film or the like is used to minimize the welding of the aluminum melt during casting to prevent galling with the cast product during mold release.
【００１１】ここで、チタン合金を用いた鋳抜きピン１
０は、例えば、Ｔｉ−６Ａｌ−４Ｖのチタン合金を用い
て、図２に示す形状に鋳抜きピンを形成した後、窒化炉
において８５０℃〜９００℃の温度で４８時間窒化処理
を施し、鋳抜きピン１０の表面にビッカース硬度２００
０以上で且つ層の厚さ５〜６μｍの窒化層（チタンナイ
トライド）を形成することによって得られる。このよう
なチタン材の表面に窒化層を形成した鋳抜きピンを用い
た場合、窒化層とアルミニウム溶湯との親和性が悪いた
めに、溶融濡れ性が低くなり、チタンとアルミニウムと
の合金層が育成され難くなって、鋳抜きピンの浸食が防
止されて損傷や離型性の悪化等を防ぐことができる。Here, the cast pin 1 made of titanium alloy
0 is, for example, a Ti-6Al-4V titanium alloy is used to form a die-cast pin in the shape shown in FIG. 2 and then is subjected to a nitriding treatment at a temperature of 850 ° C. to 900 ° C. for 48 hours in a nitriding furnace. Vickers hardness of 200 on the surface of the removal pin 10
It is obtained by forming a nitride layer (titanium nitride) having a thickness of 0 or more and a layer thickness of 5 to 6 μm. When a cast pin having a nitride layer formed on the surface of such a titanium material is used, since the affinity between the nitride layer and the molten aluminum is poor, the melt wettability becomes low and the alloy layer of titanium and aluminum is formed. It becomes difficult to grow, and corrosion of the cast pin is prevented, and damage and deterioration of releasability can be prevented.
【００１２】また、鋼製のピン表面を硬質炭素膜で被覆
した鋳抜きピン１０の形成は、例えば熱間工具鋼（ＪＩ
Ｓ ＳＫＤ６１）に低温ＣＶＤ法の代表であるプラズマ
ＣＶＤ法により、膜厚０．５〜５ｍｍの硬質炭素膜を被
覆して得ることができる。ここで、原料ガスとしては、
炭化水素系ガスを水素ガスで希釈したものが適してお
り、Ａｒガスを導入することもできる。この場合、炭、
窒化系のセラミック等の中間層を形成することもでき
る。Further, the formation of the cast pin 10 in which the surface of the steel pin is coated with a hard carbon film is performed by, for example, hot work tool steel (JI
It can be obtained by coating S SKD61) with a hard carbon film having a film thickness of 0.5 to 5 mm by a plasma CVD method which is a typical low temperature CVD method. Here, as the source gas,
A hydrocarbon gas diluted with hydrogen gas is suitable, and Ar gas can also be introduced. In this case charcoal,
It is also possible to form an intermediate layer such as a nitriding ceramic.
【００１３】図３は別実施例に係るアルミニウム鋳造用
金型の要部断面図であり、この実施例に係る金型は前記
同様固定型１及び可動型２からなり、可動型２に鋳抜き
ピン１０を設け、この鋳抜きピン１０の基部１０ｂに軸
方向にボルト１３を螺着し、可動型２に対して進退可能
に挿通すると共に、可動型２に取り付けた支持部材１４
と鋳抜きピン１０の基部１０ｂ背面との間に弾性部材で
あるスプリング１５をボルト１３に外嵌して介設するこ
とで鋳抜きピン１０を突出方向に付勢し、鋳抜きピン１
０がクッションストロークＴの範囲内で進退できるよう
にしている。FIG. 3 is a sectional view of an essential part of an aluminum casting mold according to another embodiment. The mold according to this embodiment is composed of a fixed mold 1 and a movable mold 2 as described above, and is cast on the movable mold 2. A pin 10 is provided, and a bolt 13 is axially screwed to a base portion 10b of the die-cast pin 10 so as to be inserted into the movable die 2 so as to be able to advance and retreat, and a support member 14 attached to the movable die 2.
A spring 15 which is an elastic member is externally fitted to the bolt 13 and interposed between the bolt 10 and the rear surface of the base 10b of the casting pin 10 to urge the casting pin 10 in the projecting direction.
It is set such that 0 can move forward and backward within the range of the cushion stroke T.
【００１４】ここで鋳抜きピン１０にスプリング１５で
与える荷重は、例えば３２０〜３８０ｋｇ／ｃｍ2とし
てクッションストロークＴが１〜１．５ｍｍになるよう
に設定している。尚、弾性部材としてはスプリングに限
らず、エアーシリンダやその他ゴム等を用いることもで
き、与える荷重やクッションストロークＴの範囲も限定
されるものではない。The load applied by the spring 15 to the die-cast pin 10 is set to 320 to 380 kg / cm 2 so that the cushion stroke T is 1 to 1.5 mm. The elastic member is not limited to a spring, but an air cylinder or other rubber can be used, and the range of the applied load and cushion stroke T is not limited.
【００１５】このように鋳抜きピン１０を軸方向の変位
を許容する弾性部材を介して金型に取り付けることによ
って、固定型１と可動型２が締まった状態で鋳抜きピン
１０の先端が固定型１に密着するので、アルミニウム溶
湯１６を流し込んだときに、鋳抜きピン１０と金型との
膨張率の差、鋳抜きピン１０の寸法精度等によって、鋳
抜きピン１０先端と固定型１との間に隙間が生じて膜バ
リが発生することを防止することができる。By attaching the casting pin 10 to the mold through the elastic member that allows axial displacement in this manner, the tip of the casting pin 10 is fixed while the fixed mold 1 and the movable mold 2 are tightened. Since it closely adheres to the mold 1, when the molten aluminum 16 is poured, the tip of the casting pin 10 and the fixed mold 1 are different from each other depending on the difference in expansion coefficient between the casting pin 10 and the mold, the dimensional accuracy of the casting pin 10, and the like. It is possible to prevent a film burr from being generated due to a gap between the two.
【００１６】尚、鋳抜き穴の長さが長くなるときには、
固定型１と可動型２の両者に対向して鋳抜きピン１０を
配設し、少なくとも一方の鋳抜きピン１０を付勢してク
ッションストロークが得られるようにすれば良い。When the length of the casting hole becomes long,
The casting pin 10 may be arranged so as to face both the fixed mold 1 and the movable mold 2, and at least one of the casting pins 10 may be biased to obtain a cushion stroke.
【００１７】以上においてアルミニウム鋳造を行う場合
には、固定型１及び可動型２を型締めしてアルミニウム
溶湯を注入し、アルミニウムが凝固した時点で、固定型
１の油圧シリンダ６を作動させて連結板５を介して鋳抜
きピン１０を後退させてワーク（鋳造品）Ｗから抜いた
後、可動型２を後退させて型を開く。そして、可動型２
の油圧シリンダ６を作動させて連結板５を介して鋳抜き
ピン１０後退させてワークＷから抜いた後、連結板８を
介して押出しピン７を進出させて、ワークＷを可動型２
から押出す。When aluminum casting is performed as described above, the fixed die 1 and the movable die 2 are clamped to inject the molten aluminum, and when the aluminum is solidified, the hydraulic cylinder 6 of the fixed die 1 is operated and connected. After the casting pin 10 is retracted through the plate 5 to remove it from the work (cast product) W, the movable mold 2 is retracted to open the mold. And movable type 2
The hydraulic cylinder 6 is operated to retract the casting pin 10 through the connecting plate 5 to remove it from the work W, and then the pushing pin 7 is advanced through the connecting plate 8 to move the work W 2
Extrude from.
【００１８】このように型開き前及び鋳造品押出し前に
鋳抜きピンを鋳造品から抜くことにより、極小の抜き勾
配とすることが可能になって、下穴加工をしないでも転
造ネジを切ることができる。By thus removing the casting pin from the casting product before opening the mold and extruding the casting product, it becomes possible to obtain a very small draft, and to cut the rolled screw without preparing a pilot hole. be able to.
【００１９】[0019]
【発明の効果】以上に説明したように本発明に係るアル
ミニウム鋳造用金型は、鋳抜きピンの抜き勾配部の勾配
を１／３００〜１／１０００に形成し、且つ抜き勾配部
の小径部及び大径部の寸法が下穴の公差内に収まるよう
にしたので、鋳造品に転造ネジを切る場合に、下穴加工
を施すことなく所定公差の下穴を得ることができて、転
造ネジの加工工数が減少する。As described above, in the aluminum casting mold according to the present invention, the draft of the casting pin is formed to have a draft of 1/300 to 1/1000, and a small diameter portion of the draft. Also, because the size of the large diameter part is set within the tolerance of the prepared hole, when cutting the rolled screw on the cast product, it is possible to obtain the prepared hole with the specified tolerance without machining the prepared hole. The number of man-hours for forming screws is reduced.
【図１】本発明に係るアルミニウム鋳造用金型の断面図FIG. 1 is a sectional view of an aluminum casting mold according to the present invention.
【図２】本発明に係るアルミニウム鋳造用金型に適用す
る鋳抜きピンの側面図FIG. 2 is a side view of a casting pin applied to the aluminum casting mold according to the present invention.
【図３】別実施例に係るアルミニウム鋳造用金型の要部
断面図FIG. 3 is a sectional view of an essential part of an aluminum casting mold according to another embodiment.
【図４】従来の鋳抜きピンの形状を示す図FIG. 4 is a diagram showing the shape of a conventional die-cast pin.
１…アルミニウム鋳造用鋳抜きピン、１ａ…鋳抜きピン
の先端部、１０，２０…金型、１１，２１…固定型、１
２，２２…可動型、１５…スプリング（弾性部材）、２
５…連結板、２６…油圧シリンダ（駆動部材）。DESCRIPTION OF SYMBOLS 1 ... Casting pin for aluminum casting, 1a ... Tip of casting pin, 10, 20 ... Mold 11,21 ... Fixed type, 1
2, 22 ... Movable type, 15 ... Spring (elastic member), 2
5 ... connecting plate, 26 ... hydraulic cylinder (driving member).
Claims (3)
抜きピンを備えたアルミニウム鋳造用金型において、前
記鋳抜きピンはアルミニウム溶湯に対して耐食性を有す
とともに抜き勾配部を有し、この抜き勾配部の勾配は１
／３００〜１／１０００とされ、且つ抜き勾配部の小径
部の径及び大径部の径は本来形成すべき下穴の径の公差
内に収まる寸法とされていることを特徴とする鋳抜きピ
ンを備えたアルミニウム鋳造用金型。1. An aluminum casting mold having a casting pin on at least one of a movable die and a stationary die, wherein the casting pin has corrosion resistance to molten aluminum and has a draft slope portion. The draft of the draft section is 1
/ 300 to 1/1000, and the diameter of the small diameter portion and the diameter of the large diameter portion of the draft portion are set within the tolerance of the diameter of the prepared hole to be originally formed. Aluminum casting mold with pins.
ルミニウム鋳造用金型において、前記鋳抜きピンは弾性
部材を介して可動型または固定型に突出方向に付勢され
た状態で取付けられていることを特徴とする鋳抜きピン
を備えたアルミニウム鋳造用金型。2. A mold for aluminum casting having a casting pin according to claim 1, wherein the casting pin is attached to a movable die or a fixed die via an elastic member in a state of being biased in a protruding direction. A die for aluminum casting with a die-cutting pin.
ピンを備えたアルミニウム鋳造用金型において、前記鋳
抜きピンは駆動部材にて鋳抜きに進退可能とされている
ことを特徴とする鋳抜きピンを備えたアルミニウム鋳造
用金型。3. An aluminum casting mold having a casting pin according to claim 1 or 2, wherein the casting pin can be advanced and retracted by a driving member for casting. A die for aluminum casting equipped with a die-cut pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9336794A JP2825433B2 (en) | 1994-05-02 | 1994-05-02 | Aluminum casting mold with cast pins |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9336794A JP2825433B2 (en) | 1994-05-02 | 1994-05-02 | Aluminum casting mold with cast pins |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07299554A true JPH07299554A (en) | 1995-11-14 |
| JP2825433B2 JP2825433B2 (en) | 1998-11-18 |
Family
ID=14080330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9336794A Expired - Fee Related JP2825433B2 (en) | 1994-05-02 | 1994-05-02 | Aluminum casting mold with cast pins |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2825433B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4894953B2 (en) * | 2008-11-26 | 2012-03-14 | トヨタ自動車株式会社 | Deburring punch pin, deburring device, and deburring method |
| JP2012091176A (en) * | 2010-10-22 | 2012-05-17 | Toyota Motor Corp | Core pin |
| CN106862442A (en) * | 2016-12-30 | 2017-06-20 | 宁波大学 | A kind of casting without material head shaft forgings-roll manufacturing process |
| JP2018012137A (en) * | 2016-07-12 | 2018-01-25 | リョービ株式会社 | Tilt-type gravity casting apparatus and tilt-type gravity casting method |
-
1994
- 1994-05-02 JP JP9336794A patent/JP2825433B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4894953B2 (en) * | 2008-11-26 | 2012-03-14 | トヨタ自動車株式会社 | Deburring punch pin, deburring device, and deburring method |
| US8905747B2 (en) | 2008-11-26 | 2014-12-09 | Toyota Jidosha Kabushiki Kaisha | Bur removing apparatus |
| JP2012091176A (en) * | 2010-10-22 | 2012-05-17 | Toyota Motor Corp | Core pin |
| JP2018012137A (en) * | 2016-07-12 | 2018-01-25 | リョービ株式会社 | Tilt-type gravity casting apparatus and tilt-type gravity casting method |
| CN106862442A (en) * | 2016-12-30 | 2017-06-20 | 宁波大学 | A kind of casting without material head shaft forgings-roll manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2825433B2 (en) | 1998-11-18 |
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