JP3712171B2 - Manufacturing method of female screw part and cast part - Google Patents
Manufacturing method of female screw part and cast part Download PDFInfo
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- JP3712171B2 JP3712171B2 JP30646399A JP30646399A JP3712171B2 JP 3712171 B2 JP3712171 B2 JP 3712171B2 JP 30646399 A JP30646399 A JP 30646399A JP 30646399 A JP30646399 A JP 30646399A JP 3712171 B2 JP3712171 B2 JP 3712171B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、鋳造後の製品取扱、あるいは機械加工、製品組立等での吊具等に使用する雌ネジ部材を鋳物に鋳ぐるむ方法であって、雌ネジ部の製造方法及び鋳物部品に関するものである。
【０００２】
【従来の技術】
従来、鋳造後の製品を搬送等で取り扱う場合に、吊具用フックやワイヤが容易に取り付けられない形状の鋳物部品では、鋳造時に製品の側面に吊具用の吊環形状を一体で製作（鋳造）し、製品の手入れが完了した最終作業時点で切断除去して所望の製品形状に仕上げている。つまり、このような吊環形状は鋳物の素材時点で除去されるのが一般的であり、機械加工や組立部門では鋳物の適当な位置にアイボルト等の吊具用雌ネジをタップ加工で設けて使用されている。
【０００３】
通常、雌ネジを加工して使用しなければならない鋳物は大きくてハンドリングに支障をきたしているアイテムがほとんどであり、雌ネジを加工する作業も手間を要するものであった。このような改善策として、例えば特開昭６２−１１８９６１号公報に鋳造品の雌ネジ部成形方法の開示がある。図６はこの開示例を示したものであり、雌ネジ部材２１（公開公報とは番号を変えている）に雄ネジ部材２２を螺合させ、螺合させた状態で雌ネジ部材２１を鋳型２３埋設し、溶湯２４で鋳ぐるみ、鋳造品が凝固後、雄ネジ部材２２を雌ネジ部材２１から取り外して雌ネジ部を成形する方法である。更に、雌ネジ部材２１の表面に鉄とアルミニウムの合金層を設ければ鋳造の際に雌ネジ部材２１と雄ネジ部材２２との焼き付が生じないことも記載されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、雌ネジ部材２１を鋳造品に鋳ぐるむ際の溶湯の温度がきわめて高温である場合や、雌ネジ部材２１のネジ部肉厚に比べてその周囲の鋳造品（溶湯部分）の肉厚が大きすぎる場合は雌ネジ部材２１が溶湯２４から吸収した熱量を鋳型側へ十分放熱できず、ネジ部が必要以上に高温となり溶着（溶融）するという問題がある。特にネジ部の一部分でも溶着すれば雄ネジ部材２２は螺動不可能となり、雄ネジ部材２２が鋳造品から突出した部分２２ａや２２ｂを切断後ドリルで下孔を開け、ネジ加工をやり直す必要があり不都合を有していた。
【０００５】
【課題を解決するための手段】
上記課題に鑑み、本発明者は、雌ネジ部材を鋳ぐるみとして使用してもネジ部が溶着（溶融）しない雌ネジ部の製造方法とそれによって得られる鋳物部品を提供することに想到した。
【０００６】
本来、当金は鋳造品の凝固が遅れる肉厚部等に使用され、溶湯の熱量を吸収させて凝固を促進させ、欠陥の発生を防止するために利用されるものである。そのため従来の考え方としては鋳ぐるみを行う場合、溶湯の凝固時に鋳ぐるみ材と溶湯との溶着を完全にするため、鋳ぐるみと冷却能力を持つ当金の併用は検討外のものであった。本発明者は詳細な実験計画を遂行する中で雌ネジ部材の端面に当金を使用することで雌ネジ部を溶融しないで製造する方法に想到したのである。
【０００７】
雌ネジ部材を鋳物に鋳ぐるみ雌ネジ部を製造する方法において、雌ネジ部材の鋳型側の端面に当金を配設し、該当金の鋳型への放熱表面積を雌ネジ部材が溶湯から熱を吸収する吸熱表面積よりも大きくして鋳造する雌ネジ部の製造方法である。ここでの放熱表面積とは当金が鋳型と接する全表面積のことであり、また、吸熱表面積とは雌ネジ部材が溶湯と接する全表面積のことである。当金の形状は単なる円柱状の形状とするよりも、鋳型への放熱を良くするために当金にフィンやリブを設け放熱面積を極力大きくした方がよい。更に、このフィンやリブは鋳ぐるみ材である雌ネジ部材からできるだけ離れた位置の当金に配設した方が鋳型への放熱が良好である。
【０００８】
本発明は、雌ネジ部材を鋳物に鋳ぐるみ雌ネジ部を製造する方法において、雌ネジ部材の鋳型側の端面に当金を配設し、該当金に雌ネジ部材のネジ穴から鋳型への通気孔を設けて鋳造する雌ネジ部の製造方法である。雌ネジ部材を配設した鋳型に高温の溶湯を鋳込むと、雌ネジ部材のネジ穴に溜っている空気も高温となり膨張するが、中実状の当金では高熱を有する膨張した空気の逃げ場がない。更に、空気は雌ネジ部材や当金よりも熱伝導率が悪いため全体が冷却する時点では蓄熱状態となり、雌ネジ部材の大きさによってはネジ山部が冷却が遅れて溶融状態となり、形状が変形し易い。よって当金にネジ穴から鋳型への通気孔を設ければ、溶湯を鋳込んだ後の高温で膨張した空気は鋳型内へ排出可能となり、ネジ山部の冷却が遅れることもなくなり所望の形状を得ることが可能である。
【０００９】
当金に通気孔を設けた場合造型時に鋳型の砂粒が孔内に入り込み、雌ネジ部材のネジ山表面に砂粒の付着や通気を阻害する原因となることがある。このような場合は鋳型に接する側の孔の端面または孔内に紙片等の通気性部材を使用して蓋または栓をし、砂の入り込みを防止する。紙片等の可燃物であれば注湯時の溶湯の熱により可燃物が焼失し、通気を阻害することはない。また、通気を阻害しなければ金網等の非可燃物を使用して砂の入り込みを防止してもよい。
【００１０】
更に雌ネジ部材と当金とを一体に溶接して鋳造をする。当金は鋳型である砂に埋設された状態で鋳造されるので、鋳造時に位置が動く心配はないが、雌ネジ部材は何等かの方法で前もって鋳型側へ固定して置かなければ注湯時の湯圧等で所定の位置からずれる可能性がある。よって雌ネジ部材の鋳型側の端面と当金を一体に溶接する。溶接は端面の全周囲を実施しても良いが、仮止め溶接（点溶接）程度にとどめておいた方が鋳造、冷却後の当金の除去が容易である。
【００１１】
また、当金の一端に比較的長さの短い雄ネジを設け、該雄ネジを雌ネジ部材の雌ネジに螺入結合して鋳造する。雌ネジ部材のサイズが大きくなるとそれを冷却する当金の大きさも必然的に大きくなり、この両者を溶接で一体にすると重いばかりでなく取扱も煩雑となる。このような場合は当金の一端に雌ネジに螺入可能な雄ネジを設け、造型作業前に螺入組み立てる方法とする。雄ネジのネジ部長さは螺入組立ができる長さを確保すれば、それ以上に長くする必要はない。溶接作業が不要となるばかりでなく、当金の除去時も当金を螺動し分離するのみで、作業が簡易である。
【００１２】
鋳物部品の一点当りの鋳造数が僅かである場合は、消失模型を使用して鋳造をする。前もって発泡させた消失模型材を所望形状に張り合わせ、または削り出しにより模型を製作する。その後雌ネジ部材を模型の所望位置に埋め込んで鋳造すれば、木型等の模型に比べて模型費が安価であるばかりでなく、雌ネジ部材の取付け位置も自由に選択可能である。
【００１３】
更に、これまでに記載した雌ネジ部の製造方法を用いて雌ネジ部材を一体的に鋳造して鋳物部品を得る。鋳物部品には鋳造完了時点で雌ネジが成形された形状であるから、素材、加工、組立等の部署に関係なくアイボルト等の吊具を使用して容易にハンドリングが可能で搬送等も安全に実施可能である。
【００１４】
【発明の実施の形態】
以下本発明の実施例を詳細に説明するが、本発明はこれらの実施例により何等限定されるものではない。
【００１５】
【参考例】 図１は参考例である雌ネジ部の製造方法を示す部分断面正面図である。雌ネジ部材１の鋳型側の端面２に当金３を配設した。雌ネジ部材１は雌ネジ１ａの寸法がＭ２０、ネジ深さ３０ｍｍ、下穴深さ４０ｍｍとし、鋼材で製作した。また、当金３は円柱状の当金本体３ａにフランジ３ｂを二ヶ所設けた形状とした。材質は同じく鋼材とした。当金本体３ａの基本寸法は直径３５ｍｍ、長さ５０ｍｍである。フランジ３ｂは厚さ４．５ｍｍで外形寸法が５５ｍｍと６５ｍｍのものを各１枚、当金本体３ａに溶接により一体に組み立てた。この時の当金３の鋳型４への放熱表面積は雌ネジ部材１が溶湯５から熱を吸収する吸熱表面積の約２倍であった。
【００１６】
次に、雌ネジ部材１と当金３とが鋳型４を造型時に位置ずれを生じないよう、雌ネジ部材１の鋳型側の端面２に当金３を二ヶ所点溶接６して固定した。しかる後、鋳型４を自硬性砂を用いて造型した。溶湯（鋳鋼）５は高周波炉を使用して溶解し、１５５５℃で鋳型４に注湯した。鋳型内で冷却後、砂落し、押湯湯道の除去を実施後、当金３をハンマでたたき落とした。結果は溶融していない雌ネジ１ａを持つ雌ネジ部材１を鋳ぐるむことができた。
【００１７】
【実施の形態１】
図２は本発明の第１の実施例である雌ネジ部の製造方法を示す部分断面正面図である。雌ネジ部材１の鋳型側の端面２に当金３を配設した。雌ネジ部材１は参考例と同様の雌ネジ１ａの寸法がＭ２０、ネジ深さ３０ｍｍ、下穴深さ４０ｍｍとし、鋼材で製作した。また、当金３は鋼材製で、直径４０ｍｍ、長さ５０ｍｍの円柱状とし、中心部に雌ネジ部材１のネジ穴１ｂから鋳型４への通気孔３ｃを設けて鋳造する製造方法とした。通気孔３ｃは直径１０ｍｍのキリ孔とした。
【００１８】
参考例と同様、雌ネジ部材１と当金３を点溶接６後鋳型４に埋設して造型した。その後、溶湯５を高周波炉で溶解し、１５６５℃で鋳型４に注湯した。結果は良好な雌ネジ１ａを得ることができたが、雌ネジ１ａの表面に僅かな砂粒の付着が見られた。付着した砂粒は鋳型４を造型時に通気孔３ｃから入り込んだものと推察されるが、雌ネジ１ａをタップでさらえることで容易に除去できた。
【００１９】
【実施の形態２】
図３は本発明の第２の実施例である雌ネジ部の製造方法を示す部分断面正面図である。雌ネジ部材１の鋳型側の端面２に当金３を配設した。雌ネジ部材１は第１の実施例と類似の雌ネジ１ａの寸法がＭ２０、ネジ長さ４０ｍｍ、下穴深さ５０ｍｍとし、鋼材製とした。また、当金３は直径４０ｍｍ、長さ５５ｍｍの円柱状とし、中心部に雌ネジ部材１のネジ穴１ｂから鋳型４への通気孔３ｃを設けて鋳造する製造方法とし、通気孔３ｃが鋳型４に接する面に砂入り防止用の通気性部材７として紙片を配設した。通気孔３ｃは直径１８ｍｍのキリ孔とした。
【００２０】
第１の実施例と同様、雌ネジ部材１と当金３を点溶接６後鋳型４に埋設して造型した。その後、溶湯５を高周波炉で溶解し、１５６０℃で鋳型４に注湯した。結果は良好な雌ネジ１ａを得ることができた。なお、第２の実施例で見られたような雌ネジ１ａの表面の砂粒の付着は全く見られなかった。
【００２１】
【実施の形態３】
図４は本発明の第３の実施例である雌ネジ部の製造方法を示す部分断面正面図である。雌ネジ部材１の鋳型側の端面２に当金３を配設した。雌ネジ部材１は雌ネジ１ａの寸法がＭ２４、ネジ深さ５０ｍｍ、下穴深さ６０ｍｍとした鋼材製である。また、当金３は基本寸法を直径４２ｍｍ、長さ５０ｍｍの円柱状とし、更に雌ネジ１ａに螺入するための雄ネジ３ｄをＭ２４、長さ１５ｍｍの大きさで設けた。また当金３の中心部に雌ネジ部材１のネジ穴１ｂから鋳型４への通気孔３ｃを設けて鋳造する製造方法とし、通気孔３ｃが鋳型４に接する面に砂入り防止用の通気性部材７としてセラミック製フィルターを配した。このセラミック製フィルターは通常湯道系統で注湯時のノロ等の異物噛み防止用として使用される微細な孔が開いたフィルターである。なお、通気孔３ｃは直径１４ｍｍのキリ孔とした。
【００２２】
雌ネジ部材１の雌ネジ１ａに当金３の雄ネジ３ｄを螺入組立後、鋳型４に埋設して造型した。その後、溶湯５を高周波炉で溶解し、１５６０℃で鋳型４に注湯した。結果は第３の実施例と同様、良好な雌ネジ１ａを得ることができた。また通気性部材７であるセラミック製フィルターは非可燃性物質であるため繰り返し使用が可能で、経済的である。
【００２３】
【実施の形態４】
図５は本発明の第４の実施例で、鋳物部品の製造方法を示す鋳型の断面正面図である。まず、製造する鋳物部品の形状を消失模型材を削り出しで加工し、消失模型８を製作した。鋳物部品はプレス用金型素材である。次に、消失模型８の所望の位置に雌ネジ部材１を埋設するための穴をナイフで開けた。雌ネジ部材１と通気孔３ｃを設けた当金３は、前記実施例２と同様に点溶接で一体に固定した。しかる後に、消失模型８の所望の位置に雌ネジ部材１をはめ込み、通気性部材７として紙片を使用して通気孔３ｃを塞いだ。引き続いて下鋳枠９をかぶせ、自硬性砂を投入し、下鋳型１０を完成させた。更に、下鋳枠９に上鋳枠１１をセットし、所望の位置に押湯１２と湯口１３を設け、自硬性砂を投入して上鋳型１４を完成させた。
【００２４】
下鋳型１０と上鋳型１４の自硬性砂が十分に硬化完了後、容量５ｔｏｎの高周波炉で溶解した溶湯（鋳鋼）をストッパー取鍋に受け、鋳型に１５６０℃で注湯した。鋳型内で冷却後、型バラシから押湯、湯口切断迄の一連の作業を実施し、その後当金３を除去して所望の金型素材を得た。結果は雌ネジ部に溶融のない雌ネジ部材１を一体的に鋳造した良好な鋳物部品を得ることができた。また、鋳物部品の雌ネジにアイボルトを螺入し、フック付のワイヤで吊上げて搬送したがハンドリング性は良好であった。
【００２５】
【発明の効果】
以上、本発明によれば、雌ネジ部材の鋳型側の端面に当金を配設することにより、良好な雌ネジ部の製造方法とそれによって得られる鋳物部品を提供することができ、ハンドリングが容易で搬送等も安全に実施可能である。
【図面の簡単な説明】
【図１】 本発明の参考例で、当金の放熱表面積を雌ネジ部材の吸熱表面積よりも大きくした製造方法を示す部分断面正面図である。
【図２】 本発明の第１の実施例で、当金に通気孔を設けた製造方法を示す部分断面正面図である。
【図３】 本発明の第２の実施例で、当金に通気孔を設け、更に鋳型側端面に通気性部材を配した製造方法を示す部分断面正面図である。
【図４】 本発明の第３の実施例で、当金の一端に雄ネジを設けた製造方法を示す部分断面正面図である。
【図５】 本発明の第４の実施例で、鋳物部品の製造方法を示す鋳型の断面正面図である。
【図６】 従来の実施例で、雌ネジ部材に雄ネジ部材を螺合させ、螺合させた状態で雌ネジ部を成形する方法を示す断面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for casting a female screw member used for a hanging tool in product handling, machining, product assembly, etc. after casting into a casting, and relates to a method for manufacturing a female screw part and a cast part. It is.
[0002]
[Prior art]
Conventionally, when casting products that have been cast are handled by transport, etc., for casting parts that cannot be easily attached with hooks or wires for hanging tools, a hanging ring shape for hanging tools is integrally manufactured on the side of the product during casting (casting). ), And cut and removed at the final work when the product has been cleaned, and finished to the desired product shape. In other words, it is common for such hanging ring shapes to be removed at the time of casting material. In machining and assembly departments, tapping is applied to female bolts for hanging tools such as eyebolts at appropriate positions on the casting. Has been.
[0003]
Usually, most of the castings that have to be processed and used with female threads are large and have problems in handling, and the work of processing the female threads is time-consuming. As such an improvement measure, for example, JP-A-62-118961 discloses a method for forming a female thread portion of a cast product. FIG. 6 shows an example of this disclosure. The male screw member 22 is screwed into the female screw member 21 (the number is different from that of the public gazette), and the female screw member 21 is molded as a mold in the screwed state. 23, the caster is filled with the molten metal 24, and after the cast product is solidified, the male screw member 22 is removed from the female screw member 21 to form the female screw part. Further, it is described that if an alloy layer of iron and aluminum is provided on the surface of the female screw member 21, the female screw member 21 and the male screw member 22 are not seized during casting.
[0004]
[Problems to be solved by the invention]
However, when the temperature of the molten metal when casting the female screw member 21 into a cast product is extremely high, or when the thickness of the surrounding cast product (melted portion) is larger than the thickness of the screw portion of the female screw member 21. Is too large, the amount of heat absorbed by the female screw member 21 from the molten metal 24 cannot be sufficiently dissipated to the mold side, and there is a problem that the screw portion becomes hotter than necessary and is welded (melted). In particular, if even a part of the screw portion is welded, the male screw member 22 cannot be screwed, and the male screw member 22 needs to drill a pilot hole after cutting the portions 22a and 22b protruding from the cast product and redo the screw processing. There was an inconvenience.
[0005]
[Means for Solving the Problems]
In view of the above problems, the present inventor has conceived of providing a method for producing a female screw portion in which the screw portion is not welded (melted) even if the female screw member is used as a cast-in, and a cast part obtained thereby.
[0006]
Originally, this gold is used for a thick part where the solidification of a cast product is delayed, and is used to absorb heat of the molten metal to promote solidification and prevent the occurrence of defects. Therefore, as a conventional way of thinking, when performing a cast-up, the combined use of the cast-in and the cooling metal has been out of consideration in order to completely weld the cast material and the molten metal when the molten metal is solidified. The present inventor has come up with a method for manufacturing the female screw part without melting by using the abutment on the end face of the female screw member while carrying out a detailed experimental design.
[0007]
A method of manufacturing a glove seen female screw portion cast the female screw member in casting, and disposed losses on an end face of the mold side of the female screw member, the heat radiating surface area to the corresponding metal mold female screw member from the molten metal It is a manufacturing method of the internal thread part casted by making it larger than the endothermic surface area which absorbs. Here, the heat radiating surface area is the total surface area where the gold contacts the mold, and the endothermic surface area is the total surface area where the female screw member contacts the molten metal. Rather than having a simple cylindrical shape, it is better to provide fins and ribs on the metal to increase the heat dissipation area as much as possible in order to improve heat dissipation to the mold. Further, the heat radiation to the mold is better when these fins and ribs are arranged on the abutting as far as possible from the female screw member which is a cast-in material.
[0008]
The present invention relates to a process for preparing a glove seen female screw portion cast the female screw member in casting, and disposed losses on an end face of the mold side of the female screw member, the screw hole of the female screw member in the appropriate metal into the mold It is a manufacturing method of the internal thread part which provides and ventilates this air hole. When high-temperature molten metal is cast into a mold provided with a female screw member, the air accumulated in the screw hole of the female screw member also becomes hot and expands. Absent. Furthermore, since air has a lower thermal conductivity than the female screw member or metal, it becomes a heat storage state when the whole is cooled, and depending on the size of the female screw member, the screw thread portion is delayed in cooling and melted, and the shape is Easy to deform. Therefore, if a vent hole from the screw hole to the mold is provided in the metal, the air expanded at a high temperature after casting the molten metal can be discharged into the mold, and the desired shape can be prevented without delaying the cooling of the screw thread. It is possible to obtain
[0009]
When the metal plate is provided with a vent hole, the sand particles of the mold may enter into the hole during molding, and this may cause the sand particles to adhere to the thread surface of the female screw member and to inhibit the air flow. In such a case, an air-permeable member such as a piece of paper is used to cover or plug the end face of the hole on the side in contact with the mold or in the hole to prevent sand from entering. If it is a combustible material such as a piece of paper, the combustible material is burned down by the heat of the molten metal during pouring and does not hinder aeration. In addition, sand entry may be prevented by using a non-combustible material such as a wire mesh if airflow is not hindered.
[0010]
Further, the female screw member and the gold are welded together and cast. Since the gold is cast in a state where it is embedded in the sand, which is the mold, there is no worry of the position moving during casting, but the female screw member must be fixed to the mold side in some way before pouring. There is a possibility of deviating from a predetermined position due to the hot water pressure or the like. Therefore, the end face of the female screw member on the mold side and the metal are welded together. Welding may be performed on the entire periphery of the end face, but it is easier to remove the gold after casting and cooling if it is limited to temporary fixing (spot welding).
[0011]
Further, a male screw having a relatively short length is provided at one end of the gold, and the male screw is screwed into the female screw of the female screw member for casting. As the size of the female screw member increases, the size of the abutment that cools the female screw member inevitably increases. When these two members are integrated by welding, they are not only heavy but also complicated to handle. In such a case, a male screw that can be screwed into a female screw is provided at one end of the metal and is assembled by screwing before molding. The length of the threaded portion of the male screw does not need to be longer than that as long as the length capable of screw-in assembly is secured. Not only is the welding operation unnecessary, but the operation is simplified by only screwing and separating the gold when removing the gold.
[0012]
If the number of castings per casting part is very small, cast using the disappearance model. A model is manufactured by pasting or scraping the disappeared model material previously foamed into a desired shape. Thereafter, if the female screw member is embedded in a desired position of the model and cast, not only the model cost is lower than that of a model such as a wooden mold, but also the mounting position of the female screw member can be freely selected.
[0013]
Further, the female screw member is integrally cast using the method for manufacturing the female screw portion described so far to obtain a cast part. Cast parts have a shape with internal threads formed at the time of casting, so they can be easily handled using lifting tools such as eyebolts regardless of the material, processing, assembly, etc. It can be implemented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described in detail below, but the present invention is not limited to these examples.
[0015]
[ Reference Example ] FIG. 1 is a partial cross-sectional front view showing a method for manufacturing a female screw portion as a reference example . An abutment 3 is disposed on the end surface 2 of the female screw member 1 on the mold side. The female screw member 1 was made of a steel material with the female screw 1a having a dimension of M20, a screw depth of 30 mm, and a pilot hole depth of 40 mm. In addition, the metal 3 has a shape in which two flanges 3b are provided on a cylindrical metal body 3a. The material was also steel. The basic dimensions of the gold main body 3a are 35 mm in diameter and 50 mm in length. Each of the flanges 3b having a thickness of 4.5 mm and outer dimensions of 55 mm and 65 mm was integrally assembled to the gold main body 3a by welding. At this time, the heat radiating surface area of the metal 3 to the mold 4 was about twice the heat absorbing surface area where the female screw member 1 absorbs heat from the molten metal 5.
[0016]
Next, the metal 3 was fixed to the end surface 2 on the mold side of the female screw member 1 by spot welding 6 at two points so that the female screw member 1 and the metal 3 would not be displaced when the mold 4 was formed. Thereafter, the mold 4 was formed using self-hardening sand. The molten metal (cast steel) 5 was melted using a high frequency furnace and poured into the mold 4 at 1555 ° C. After cooling in the mold, the sand was removed and the hot water runner was removed, and the metal 3 was struck with a hammer. As a result, the female screw member 1 having the unmelted female screw 1a could be cast.
[0017]
[Embodiment 1 ]
FIG. 2 is a partial cross-sectional front view showing a method for manufacturing the female thread portion according to the first embodiment of the present invention. An abutment 3 is disposed on the end surface 2 of the female screw member 1 on the mold side. The female screw member 1 was made of a steel material having the same female screw 1a dimensions as in the reference example , M20, a screw depth of 30 mm, and a pilot hole depth of 40 mm. In addition, the abutment 3 is made of a steel material, has a columnar shape with a diameter of 40 mm and a length of 50 mm, and has a manufacturing method in which a vent hole 3 c from the screw hole 1 b of the female screw member 1 to the mold 4 is provided at the center and cast. The vent hole 3c was a drill hole having a diameter of 10 mm.
[0018]
Similarly to the reference example , the female screw member 1 and the metal 3 were embedded in the mold 4 after the spot welding 6 and formed. Thereafter, the molten metal 5 was melted in a high frequency furnace and poured into the mold 4 at 1565 ° C. As a result, a good female screw 1a could be obtained, but a slight amount of sand particles adhered to the surface of the female screw 1a. The adhering sand particles are presumed to have entered from the vent hole 3c when the mold 4 was formed, but could be easily removed by wiping the female screw 1a with a tap.
[0019]
[Embodiment 2 ]
FIG. 3 is a partial cross-sectional front view showing a method for manufacturing the female thread portion according to the second embodiment of the present invention. An abutment 3 is disposed on the end surface 2 of the female screw member 1 on the mold side. The female screw member 1 was made of a steel material having a female screw la similar to that of the first embodiment having a size of M20, a screw length of 40 mm, and a pilot hole depth of 50 mm. Further, the abutment 3 has a columnar shape with a diameter of 40 mm and a length of 55 mm, and a manufacturing method for casting by providing a vent hole 3 c from the screw hole 1 b of the female screw member 1 to the mold 4 at the center, and the vent hole 3 c is a mold. A piece of paper was disposed on the surface in contact with 4 as a breathable member 7 for preventing sand from entering. The vent hole 3c was a drill hole with a diameter of 18 mm.
[0020]
In the same manner as in the first example, the female screw member 1 and the metal 3 were embedded in the mold 4 after spot welding 6 to make a mold. Thereafter, the molten metal 5 was melted in a high frequency furnace and poured into the mold 4 at 1560 ° C. As a result, a good female screw 1a was obtained. Note that no adhesion of sand particles on the surface of the female screw 1a as seen in the second example was observed.
[0021]
[Embodiment 3 ]
FIG. 4 is a partial cross-sectional front view showing a method for manufacturing the female thread portion according to the third embodiment of the present invention. An abutment 3 is disposed on the end surface 2 of the female screw member 1 on the mold side. The female screw member 1 is made of a steel material in which the female screw 1a has a dimension of M24, a screw depth of 50 mm, and a pilot hole depth of 60 mm. Further, the metal 3 has a cylindrical shape with a basic dimension of 42 mm in diameter and 50 mm in length, and further provided with a male screw 3d having a size of M24 and a length of 15 mm for screwing into the female screw 1a. In addition, a manufacturing method is provided in which a vent hole 3c from the screw hole 1b of the female screw member 1 to the mold 4 is provided in the center of the abutment 3 for casting, and the vent hole 3c has a breathability for preventing sand from entering the surface in contact with the mold 4. A ceramic filter was disposed as the member 7. This ceramic filter is a filter with a fine hole that is usually used in a runner system to prevent biting of foreign matters such as sludge during pouring. The vent hole 3c was a drill hole having a diameter of 14 mm.
[0022]
The male screw 3d of the abutment 3 was screwed into the female screw 1a of the female screw member 1 and then embedded in the mold 4 to make a mold. Thereafter, the molten metal 5 was melted in a high frequency furnace and poured into the mold 4 at 1560 ° C. As a result, similar to the third embodiment, an excellent female screw 1a could be obtained. Further, the ceramic filter as the air permeable member 7 is a non-flammable material, so that it can be used repeatedly and is economical.
[0023]
[Embodiment 4 ]
FIG. 5 is a sectional front view of a mold showing a method for producing a cast part according to a fourth embodiment of the present invention. First, the disappearance model material was machined by machining the shape of the cast part to be manufactured, and the disappearance model 8 was manufactured. Casting parts are press mold materials. Next, a hole for embedding the female screw member 1 at a desired position of the disappearance model 8 was opened with a knife. The metal cap 3 provided with the female screw member 1 and the vent hole 3c was fixed integrally by spot welding in the same manner as in Example 2 . Thereafter, the female screw member 1 was fitted into a desired position of the disappearance model 8 and a piece of paper was used as the air permeable member 7 to close the air hole 3c. Subsequently, the lower casting frame 9 was covered, and self-hardening sand was introduced to complete the lower mold 10. Further, the upper casting frame 11 was set on the lower casting frame 9, the hot water 12 and the gate 13 were provided at desired positions, and self-hardening sand was introduced to complete the upper mold 14.
[0024]
After the self-hardening sand of the lower mold 10 and the upper mold 14 was fully cured, the molten metal (cast steel) melted in a high-frequency furnace having a capacity of 5 tons was received in a stopper ladle and poured into the mold at 1560 ° C. After cooling in the mold, a series of operations from the mold separation to the pouring and cutting of the pouring gate were performed, and then the metal 3 was removed to obtain a desired mold material. As a result, it was possible to obtain a good cast part in which the female screw member 1 having no melting in the female screw part was integrally cast. In addition, an eyebolt was screwed into the female thread of the cast part, and it was lifted and transported by a wire with a hook, but the handling property was good.
[0025]
【The invention's effect】
As described above, according to the present invention, by providing the abutment on the end surface of the female screw member on the mold side, it is possible to provide a method for manufacturing a good female screw portion and a cast part obtained thereby, and handling is possible. It is easy and can be transported safely.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing a manufacturing method in a reference example of the present invention in which the heat dissipating surface area of gold is made larger than the endothermic surface area of a female screw member.
FIG. 2 is a partial cross-sectional front view showing a manufacturing method in which a ventilation hole is provided in the gold in the first embodiment of the present invention.
FIG. 3 is a partial cross-sectional front view showing a manufacturing method in which a vent hole is provided in the metal and a breathable member is arranged on the mold side end surface in the second embodiment of the present invention.
FIG. 4 is a partial cross-sectional front view showing a manufacturing method in which a male screw is provided at one end of the gold in a third embodiment of the present invention.
FIG. 5 is a sectional front view of a mold showing a method for producing a cast part in a fourth embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a method of forming a female screw portion in a state where the male screw member is screwed into the female screw member and the screwed state is engaged in a conventional example.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30646399A JP3712171B2 (en) | 1999-10-28 | 1999-10-28 | Manufacturing method of female screw part and cast part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30646399A JP3712171B2 (en) | 1999-10-28 | 1999-10-28 | Manufacturing method of female screw part and cast part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001129653A JP2001129653A (en) | 2001-05-15 |
| JP3712171B2 true JP3712171B2 (en) | 2005-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30646399A Expired - Lifetime JP3712171B2 (en) | 1999-10-28 | 1999-10-28 | Manufacturing method of female screw part and cast part |
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| JP (1) | JP3712171B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1584388A1 (en) | 2004-04-05 | 2005-10-12 | Kabushiki Kaisha Toyota Jidoshokki | Cap nut for envelopment casting, casting including the cap nut and method of enveloping the cap nut in casting |
| JP2008261352A (en) * | 2007-04-10 | 2008-10-30 | Showa Denko Kk | Metal part with screw hole and method of manufacturing same and liner for pressure vessel and method of manufacturing same |
| CN105537522B (en) * | 2016-02-22 | 2017-09-05 | 江苏钜源机械有限公司 | A kind of Negative casting of EPC uses the process of internal densener |
| CN111992669A (en) * | 2020-08-19 | 2020-11-27 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method for casting with long and narrow cavity inside |
| CN113560534B (en) * | 2021-07-14 | 2023-04-07 | 四川省柏均机械制造有限责任公司 | Anti-oxidation treatment process for pre-buried threads |
| CN113787168B (en) * | 2021-09-14 | 2023-04-07 | 河北光德精密机械股份有限公司 | Precise thread casting process for high-temperature alloy part |
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1999
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| JP2001129653A (en) | 2001-05-15 |
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