JP4295019B2 - Casting mold for wheels for motorcycles - Google Patents

Casting mold for wheels for motorcycles Download PDF

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Publication number
JP4295019B2
JP4295019B2 JP2003159372A JP2003159372A JP4295019B2 JP 4295019 B2 JP4295019 B2 JP 4295019B2 JP 2003159372 A JP2003159372 A JP 2003159372A JP 2003159372 A JP2003159372 A JP 2003159372A JP 4295019 B2 JP4295019 B2 JP 4295019B2
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Japan
Prior art keywords
mold
core
runner
wheel
casting
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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
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JP2003159372A
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Japanese (ja)
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JP2004358510A (en
Inventor
正美 山本
直樹 藤江
Original Assignee
旭テック株式会社
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Priority to JP2003159372A priority Critical patent/JP4295019B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、二輪車用のホイールを製造するために使用される鋳造金型に関するものである。
【0002】
【従来の技術】
二輪車用のホイールを鋳造によって製造する場合には、通常、上型、下型、横型及び型内に配置される中子から構成される鋳造金型が使用される。中子は、ハブやスポークの中空部となる部分を形成するため、型内の所定位置に配置されるが、型内に溶湯を注入した際に、溶湯の浮力によって位置ズレを起こしやすいため、適切な方法によって固定しておく必要がある。
【0003】
従来、スポークが中空、すなわちパイプ状であるような二輪車用ホイールを鋳造する場合は、スポークの中空部を形成するための部位(スポーク中空形成部)と、ハブの中空部を形成するための部位(ハブ中空形成部)とが一体となった中子を使用し、当該中子のスポーク中空形成部において、上型や下型との間にピン等の支持部材を介在させることで、中子の位置固定を行っていた(例えば、特許文献1参照。)。
【0004】
【特許文献1】
特開平9−1315号公報
【0005】
【発明が解決しようとする課題】
しかしながら、スポークが中空ではなく中実であるような二輪車用のホイールを鋳造しようとする場合には、中子にスポーク中空形成部が存在しないため、前記のように中子のスポーク中空形成部において上型や下型との間に支持部材を介在させるという固定方法は適用することができない。
【0006】
本発明は、このような従来の事情に鑑みてなされたものであり、その目的とするところは、スポークが中実であるような二輪車用のホイールを鋳造しようとする場合に、型内において、中子を所定の位置に固定でき、溶湯の浮力による中子の位置ズレを防ぐことができるような二輪車用ホイールの鋳造金型を提供することにある。
【0007】
【課題を解決するための手段】
本発明によれば、上型、下型、横型及び型内に配置される中子を有する二輪車用ホイールの鋳造金型において、前記上型に設けられた湯道の型内側開口部付近に、湯道径を拡大することにより段差部を形成するとともに、前記中子の一部に、前記湯道の型内側開口部付近に突出する凸状部を設け、当該凸状部に装着された状態でその先端部が前記湯道内に挿入され、かつ、その表面に前記段差部に係合するような複数の突出部が放射状に形成されたキャップ状の中子固定用治具を設けたことを特徴とする二輪車用ホイールの鋳造金型、が提供される。
【0008】
【発明の実施の形態】
図1は本発明に係る二輪車用ホイールの鋳造金型の実施形態の一例を示す断面図で、図2は図1の要部拡大図、図3は図1のA−A線断面図ある。本発明の二輪車用ホイールの鋳造金型は、上型1、下型2、横型3、4及び型内に配置される中子5を有するものであり、これらを図1のように組み合わせることによって、鋳造金型内に鋳造空間(キャビティー)6が形成される。なお、本例に示す鋳造金型は、スポークが中実であるような二輪車用のホイールを製造するためのものである。したがって、中子5は、スポークの中空部を形成するための部位(スポーク中空形成部)は持たず、ハブの中空部を形成するための部位(ハブ中空形成部)のみからなっている。
【0009】
本発明は、その特徴的な構造として、まず、上型1に設けられた湯道7の型内側開口部付近に、湯道径を拡大することにより段差部8が形成されている。また、中子5の一部に、湯道7の型内側開口部付近に突出する凸状部9が設けられている。そして、この凸状部9には、中子固定用治具10が装着され、この中子固定用治具10によって、中子5が型内の所定位置に固定される。
【0010】
中子固定用治具10は、凸状部9に対応した凹状部11を有するキャップ状の治具10であり、凸状部9に装着された状態でその先端部が上型1の湯道7内に挿入される。また、このキャップ状の中子固定用治具10は、その表面に段差部8に係合するような複数の突出部12が放射状に形成されている。
【0011】
そして、中子5が型内の所定位置に配置されたときに、このように中子固定用治具10の突出部12が、湯道7の型内側開口部付近に形成された段差部8に係合された状態(すなわち、突出部12が段差部8に引っ掛かって、中子固定用治具10がそれ以上は上方へ移動できないような状態)となるようにしておけば、中子5の上方向への動きは、中子固定用治具10を介して上型により押さえられることになる。したがって、溶湯が鋳造空間6に注入されても、その溶湯の浮力によって、中子5が浮き上がるようなことはなく、中子5は注湯から凝固までの過程を通じて、当初の所定位置に固定的に保持される。
【0012】
なお、図1のA−A線断面図である図3に示すように、中子固定用治具10は、その表面に放射状に形成された突出部12のみによって、段差部8に係合しており、中子固定用治具10表面の突出部12が形成されていない部分と湯道7の内面との間には、湯道7と型内の鋳造空間6とを連通させる空間13が形成される。このため、中子固定用治具10を用いても、それによって湯道7が閉塞されることはなく、湯口から注入された溶湯は、この空間13を通過して鋳造空間6内へと充填される。
【0013】
【発明の効果】
以上説明したように、本発明によれば、スポークが中実であるような二輪車用のホイールを鋳造しようとする場合に、型内において、中子を所定の位置に固定でき、溶湯の浮力による中子の位置ズレを防ぐことができる。
【図面の簡単な説明】
【図1】 本発明に係る二輪車用ホイールの鋳造金型の実施形態の一例を示す断面図である。
【図2】 図1の要部拡大図である。
【図3】 図1のA−A線断面図である。
【符号の説明】
1…上型、2…下型、3…横型、4…横型、5…中子、6…鋳造空間、7…湯道、8…段差部、9…凸状部、10…中子固定用治具、11…凹状部、12…突出部、13…空間。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a casting mold used for manufacturing a wheel for a motorcycle.
[0002]
[Prior art]
When a wheel for a motorcycle is manufactured by casting, a casting mold composed of an upper mold, a lower mold, a horizontal mold, and a core disposed in the mold is usually used. The core is arranged at a predetermined position in the mold to form a hollow portion of the hub or spoke, but when the molten metal is injected into the mold, it is likely to cause a positional shift due to the buoyancy of the molten metal. It must be fixed by an appropriate method.
[0003]
Conventionally, when casting a wheel for a motorcycle having a hollow spoke, that is, a pipe shape, a portion for forming the hollow portion of the spoke (spoke hollow forming portion) and a portion for forming the hollow portion of the hub The core is integrated with the (hub hollow forming portion), and the core is formed by interposing a support member such as a pin between the upper die and the lower die in the spoke hollow forming portion of the core. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-1315
[Problems to be solved by the invention]
However, when trying to cast a wheel for a two-wheeled vehicle in which the spoke is solid rather than hollow, there is no spoke hollow forming portion in the core, so in the spoke hollow forming portion of the core as described above A fixing method in which a support member is interposed between the upper mold and the lower mold cannot be applied.
[0006]
The present invention has been made in view of such conventional circumstances, and the purpose of the present invention is in a mold when trying to cast a wheel for a two-wheeled vehicle whose spokes are solid, It is an object of the present invention to provide a casting mold for a wheel for a motorcycle that can fix the core in a predetermined position and prevent the positional displacement of the core due to the buoyancy of the molten metal.
[0007]
[Means for Solving the Problems]
According to the present invention, in a casting mold for a motorcycle wheel having an upper mold, a lower mold, a horizontal mold and a core arranged in the mold, in the vicinity of the mold inner opening of the runner provided in the upper mold, A stepped portion is formed by enlarging the runner diameter, and a convex portion projecting in the vicinity of the mold inner opening of the runner is provided in a part of the core, and is attached to the convex portion. And a cap-shaped core fixing jig having a plurality of protrusions radially formed on the surface thereof so as to be engaged with the stepped portion is provided. A two-wheeled vehicle wheel casting mold is provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 is a cross-sectional view showing an example of an embodiment of a casting mold for a motorcycle wheel according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. The casting mold for a motorcycle wheel of the present invention has an upper mold 1, a lower mold 2, horizontal molds 3, 4 and a core 5 arranged in the mold, and these are combined as shown in FIG. A casting space (cavity) 6 is formed in the casting mold. The casting mold shown in this example is for manufacturing a wheel for a motorcycle having spokes that are solid. Accordingly, the core 5 does not have a portion for forming the hollow portion of the spoke (spoke hollow forming portion), but only includes a portion for forming the hollow portion of the hub (hub hollow forming portion).
[0009]
As a characteristic structure of the present invention, first, a step portion 8 is formed in the vicinity of the mold inner opening of the runner 7 provided in the upper mold 1 by enlarging the runner diameter. In addition, a protruding portion 9 that protrudes in the vicinity of the mold inner opening of the runner 7 is provided in a part of the core 5. A core fixing jig 10 is attached to the convex portion 9, and the core 5 is fixed at a predetermined position in the mold by the core fixing jig 10.
[0010]
The core fixing jig 10 is a cap-shaped jig 10 having a concave portion 11 corresponding to the convex portion 9, and the tip portion of the core fixing jig 10 attached to the convex portion 9 is a runner of the upper mold 1. 7 is inserted. The cap-shaped core fixing jig 10 has a plurality of projecting portions 12 radially formed on the surface thereof so as to engage with the stepped portion 8.
[0011]
Then, when the core 5 is arranged at a predetermined position in the mold, the protruding portion 12 of the core fixing jig 10 is thus formed in the vicinity of the mold inner opening of the runner 7. If the protrusion 12 is engaged with the stepped portion 8 (ie, the core fixing jig 10 cannot move further upward), the core 5 The upward movement is suppressed by the upper mold via the core fixing jig 10. Therefore, even if the molten metal is injected into the casting space 6, the core 5 is not lifted by the buoyancy of the molten metal, and the core 5 is fixed at the initial predetermined position through the process from pouring to solidification. Retained.
[0012]
As shown in FIG. 3, which is a cross-sectional view taken along the line AA in FIG. 1, the core fixing jig 10 is engaged with the stepped portion 8 only by the protruding portions 12 formed radially on the surface thereof. A space 13 for communicating the runner 7 and the casting space 6 in the mold is formed between the portion of the core fixing jig 10 where the protrusion 12 is not formed and the inner surface of the runner 7. It is formed. For this reason, even if the core fixing jig 10 is used, the runner 7 is not blocked by this, and the molten metal injected from the gate fills the casting space 6 through the space 13. Is done.
[0013]
【The invention's effect】
As described above, according to the present invention, when trying to cast a wheel for a motorcycle having a solid spoke, the core can be fixed at a predetermined position in the mold, and the buoyancy of the molten metal Misalignment of the core can be prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an example of an embodiment of a casting mold for a wheel for a motorcycle according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Upper type, 2 ... Lower type, 3 ... Horizontal type, 4 ... Horizontal type, 5 ... Core, 6 ... Casting space, 7 ... Runway, 8 ... Step part, 9 ... Convex part, 10 ... For fixing a core Jig, 11 ... concave portion, 12 ... projecting portion, 13 ... space.

Claims (1)

上型、下型、横型及び型内に配置される中子を有する二輪車用ホイールの鋳造金型において、
前記上型に設けられた湯道の型内側開口部付近に、湯道径を拡大することにより段差部を形成するとともに、前記中子の一部に、前記湯道の型内側開口部付近に突出する凸状部を設け、当該凸状部に装着された状態でその先端部が前記湯道内に挿入され、かつ、その表面に前記段差部に係合するような複数の突出部が放射状に形成されたキャップ状の中子固定用治具を設けたことを特徴とする二輪車用ホイールの鋳造金型。
In a casting mold for a motorcycle wheel having an upper mold, a lower mold, a horizontal mold and a core disposed in the mold,
In the vicinity of the mold inner opening of the runner provided in the upper mold, a step portion is formed by enlarging the diameter of the runner, and in a part of the core, near the mold inner opening of the runner Protruding convex portions are provided, and a plurality of projecting portions that are inserted into the runner in a state of being attached to the convex portions and that engage with the stepped portions on the surface thereof are radially provided. A casting mold for a wheel for a motorcycle, comprising a cap-shaped core fixing jig formed.
JP2003159372A 2003-06-04 2003-06-04 Casting mold for wheels for motorcycles Expired - Fee Related JP4295019B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003159372A JP4295019B2 (en) 2003-06-04 2003-06-04 Casting mold for wheels for motorcycles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003159372A JP4295019B2 (en) 2003-06-04 2003-06-04 Casting mold for wheels for motorcycles

Publications (2)

Publication Number Publication Date
JP2004358510A JP2004358510A (en) 2004-12-24
JP4295019B2 true JP4295019B2 (en) 2009-07-15

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006263798A (en) * 2005-03-25 2006-10-05 Asahi Tec Corp Mold assembly for casting wheel of two wheeled vehicle
CN102151795A (en) * 2011-03-25 2011-08-17 浙江今飞机械集团有限公司 Back casting method of hub of electric motorcycle and die
GB2566529A (en) * 2017-09-18 2019-03-20 Nissan Motor Iberica Sa Improvements relating to brake disc casting manufacturing

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