JP2014200793A - Removal method of residual deposit for hot forging mold - Google Patents
Removal method of residual deposit for hot forging mold Download PDFInfo
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- JP2014200793A JP2014200793A JP2013075841A JP2013075841A JP2014200793A JP 2014200793 A JP2014200793 A JP 2014200793A JP 2013075841 A JP2013075841 A JP 2013075841A JP 2013075841 A JP2013075841 A JP 2013075841A JP 2014200793 A JP2014200793 A JP 2014200793A
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Abstract
Description
本発明は、熱間鍛造用金型の残留付着物の除去方法に関するものである。 The present invention relates to a method for removing residual deposits from a hot forging die.
例えば、Ｔｉ合金やＡｌｌｏｙ７１８等に代表される難加工性材料を鍛造する場合、難加工性材料でなる被鍛造材を例えば１０００℃に加熱し、熱間鍛造用金型を用いて熱間で所望の形状に鍛造する。このとき、熱間鍛造用金型の表面のうち被鍛造物に接触する面に被鍛造材の一部が分離、付着して、いわゆる「焼き付き」が起こる場合がある。焼き付きを放置すると、付着した被鍛造材が徐々に増え、被鍛造材に焼き付きの形状が転写され、欠肉や外観肌不良などの問題発生する。そこで、このような焼き付きを防止するために、黒鉛系または硝子系の潤滑剤または離型剤が用いられている。
これらの潤滑剤または離型剤を用いた場合、熱間鍛造を終えた熱間鍛造用金型には固着または付着した潤滑剤や離型剤が残留する。潤滑剤や離型剤が残留すると、上述したように、欠肉や外観肌不良などの問題が発生する。そこで、このような付着物を効果的に除去する方法として、例えば、特開２００６−２９７７０５号公報には、金型に付着した成形カスおよび離型材などの堆積物が付着する金型を熱板ヒーター等の加熱装置上に設置しかつ加熱温度をコントロールして、ドライアイスペレットを粉砕したドライアイス粒をキャリアガスにより噴射あるいはブラストすることにより、金型に付着する堆積物の除去あるいは洗浄を行う方法の発明が提案されている。
For example, when forging a difficult-to-work material represented by Ti alloy or Alloy 718, the material to be forged made of the difficult-to-work material is heated to, for example, 1000 ° C., and desired hot using a hot forging die. Forging into the shape of At this time, a part of the material to be forged may be separated and adhered to the surface of the hot forging die that contacts the material to be forged, and so-called “burn-in” may occur. If the seizure is left untouched, the attached forging material gradually increases, the seizing shape is transferred to the forging material, and problems such as lack of flesh and poor appearance skin occur. In order to prevent such seizure, graphite-based or glass-based lubricants or mold release agents are used.
When these lubricants or mold release agents are used, the lubricant or mold release agent that remains fixed or adheres remains in the hot forging die after hot forging. If the lubricant or mold release agent remains, problems such as lack of thickness and poor appearance skin occur as described above. Therefore, as a method for effectively removing such deposits, for example, Japanese Patent Laid-Open No. 2006-297705 discloses a mold in which deposits such as molding residue and release material adhered to a mold are attached to a hot plate. Installed on a heating device such as a heater and controlled the heating temperature to remove or wash deposits adhering to the mold by spraying or blasting dry ice particles crushed dry ice pellets with a carrier gas A method invention has been proposed.
上述した特許文献１で示されるのは、主に合成プラスチック、合成ゴム、その他残留物あるいは離型剤などの堆積物の除去を対象とするものである。この特許文献１で示される金型の洗浄方法をそのまま熱間鍛造用金型に用いようとすると、被鍛造材の違いに起因した、用いる潤滑剤や離型剤の違いから熱間鍛造用金型に残留する堆積物の除去が不完全となる。
上述した、金属材料を被鍛造材として熱間鍛造を終えた後の熱間鍛造用金型の残留堆積物の除去方法は特に検討がなされていないのが現状である。
本発明の目的は、再結晶温度以上に加熱した金属材料の被鍛造材を熱間鍛造した後に熱間鍛造用金型に残留する付着物をより確実に除去することが可能な残留付着物の除去方法を提供する。
The above-mentioned Patent Document 1 mainly targets removal of deposits such as synthetic plastics, synthetic rubbers, and other residues or mold release agents. If the die cleaning method disclosed in Patent Document 1 is used as it is for a hot forging die, the hot forging die due to the difference in the lubricant and mold release agent used due to the difference in the material to be forged. Incomplete removal of deposits remaining on the mold.
The above-described method for removing residual deposits from a hot forging die after hot forging after using a metal material as a material to be forged has not been particularly studied.
It is an object of the present invention to provide a residual deposit that can more reliably remove deposits remaining on a hot forging die after hot forging a metal forging material heated to a temperature higher than the recrystallization temperature. A removal method is provided.
本発明は上述した課題に鑑みてなされたものである。
即ち本発明は、再結晶温度以上に加熱した金属材料を被鍛造材とし、熱間鍛造を終えた残留付着物の除去方法であって、熱間鍛造用金型に残留する付着物を加熱して固化させる加熱工程と、加熱した残留付着物に対し、ドライアイス粒子を高圧ガスで吹き付けて残留した付着物を除去する潤滑剤除去工程と、を含む熱間鍛造用金型の残留付着物の除去方法である。
The present invention has been made in view of the above-described problems.
That is, the present invention is a method for removing residual deposits after hot forging has been performed using a metal material heated to a temperature higher than the recrystallization temperature, and heating the deposits remaining in the hot forging die. And a lubricant removing step for removing the remaining deposits by spraying dry ice particles with a high-pressure gas on the heated residual deposits. It is a removal method.
本発明によれば、熱間鍛造用金型に残留する付着物をより確実に除去することが可能となる。そのため、付着物直下に発生したクラック等の欠陥を目視により容易に確認することが可能となるため、熱間鍛造用金型の割れ等を防止することが可能となる。 According to the present invention, it is possible to more reliably remove deposits remaining in the hot forging die. Therefore, since defects such as cracks that have occurred directly under the deposit can be easily confirmed visually, it is possible to prevent cracking of the hot forging die.
本発明の熱間鍛造用金型の残留堆積物の除去方法では、例えば６Ａｌ−４Ｖ−Ｔｉ等のＴｉ合金や、Ａｌｌｏｙ７１８等のＮｉ基超耐熱合金等を被鍛造材とするときに用いられる熱間鍛造用金型に残留する付着物を除去する場合に好適である。
上述したように、前記の難加工性材の熱間鍛造においては、硝子系の潤滑剤や黒鉛系の潤滑剤や離型剤が用いられている。このうち、潤滑剤は主として被鍛造材に塗布または噴霧され、離型剤は熱間鍛造用金型の型彫り面に塗布または噴霧される。その後、例えば９００℃以上の温度で被鍛造材は熱間鍛造されるが、熱間鍛造終了後においては、離型剤や潤滑剤は複雑な型彫り面に少なからず残留することになる。
この残留する付着物のうち、特に黒鉛系の離型剤が被鍛造材と接しない箇所に残留している場合、粘度が維持されることになるため、そのままでは例えば金属製のヘラ等を用いて除去する必要がある。しかしながら、熱間鍛造用金型の型彫り面の形状は複雑であるため、金属製のヘラでは完全に除去することが困難である。特に、難加工性材を熱間鍛造する熱間鍛造用金型にクラックなどが発生している場合、そのクラックを起点として金型自体が割れてしまう可能性がある。
In the method for removing a residual deposit from a hot forging die according to the present invention, for example, heat used when a Ti alloy such as 6Al-4V-Ti or a Ni-based superalloy such as Alloy 718 is used as a material to be forged. This is suitable for removing deposits remaining on the forging die.
As described above, glass-based lubricants, graphite-based lubricants, and mold release agents are used in the hot forging of the difficult-to-work materials. Among these, the lubricant is mainly applied or sprayed on the material to be forged, and the mold release agent is applied or sprayed on the die-carved surface of the hot forging die. Thereafter, the material to be forged is hot forged at a temperature of, for example, 900 ° C. or higher. However, after the hot forging is completed, the release agent and the lubricant remain on the complicated die-cut surface.
Among these remaining deposits, especially when a graphite-based mold release agent remains in a place where it does not come into contact with the material to be forged, the viscosity is maintained. For example, a metal spatula is used as it is. Need to be removed. However, since the shape of the die engraving surface of the hot forging die is complicated, it is difficult to remove it completely with a metal spatula. In particular, when a crack or the like is generated in a hot forging die for hot forging a difficult-to-work material, the die itself may be cracked starting from the crack.
（加熱工程）
そこで本発明では、上述の粘度が維持された潤滑剤等の付着物を加熱し、固化させる必要がある。これは、粘度が維持されたままの付着物に対しては、ドライアイスで洗浄しても完全に付着物の除去ができないためである。
付着物の加熱方法として、最も確実なのは付着物を直接加熱する方法である。付着物には、代表的なものとして、硝子系潤滑剤と、黒鉛系潤滑剤とがある。このうち、硝子系潤滑剤剤は熱間鍛造時の加熱後の後、冷却することによって固化する。一方、黒鉛系の潤滑剤は鍛造後においても粘性を維持していることから、特に黒鉛系潤滑剤を固化させる方法として、一旦加熱することが重要である。加熱の温度は、例えば、黒鉛系の潤滑剤の粘度が損なわれ、固化可能な約３００℃以上に加熱できるものであれば、種々の方法を適用することができる。中でも特に、例えば、ガスバーナー等を用いて粘度を維持した付着物を直接加熱する方法であれば、確実に付着物の温度を高めて、堆積物を固化することができる。
(Heating process)
Therefore, in the present invention, it is necessary to heat and solidify a deposit such as a lubricant having the above-described viscosity maintained. This is because the deposits whose viscosity is maintained cannot be completely removed by washing with dry ice.
The most reliable method for heating the deposit is to directly heat the deposit. Representative examples of the deposit include a glass-based lubricant and a graphite-based lubricant. Among these, the glass-based lubricant is solidified by cooling after heating at the time of hot forging. On the other hand, since the graphite-based lubricant maintains its viscosity even after forging, it is particularly important to heat it once as a method for solidifying the graphite-based lubricant. As the heating temperature, for example, various methods can be applied as long as the viscosity of the graphite-based lubricant is impaired and the composition can be heated to about 300 ° C. or higher which can be solidified. In particular, for example, a method of directly heating a deposit that maintains its viscosity using a gas burner or the like can reliably raise the temperature of the deposit and solidify the deposit.
（堆積物除去工程）
本発明では、上述した加熱工程で固化した堆積物に対して、ドライアイス粒子を高圧ガスで吹き付けて残留した堆積物を除去する。堆積物を固化させておくことで、ドライアイス粒子を衝突させた際に、衝撃を効率的に堆積物に伝えることができる。また、ドライアイスが昇華する際に、ＣＯ２ガスが堆積物と熱間鍛造用金型の隙間に入り込み易くなり、堆積物を容易に除去することが可能となる。
用いるドライアイス粒子は例えば直径が３〜５ｍｍ、長さが５〜１０ｍｍ程度のペレット状のものであればよく、例えば、１〜６ｂａｒの圧縮空気を用いてドライアイス粒子を噴射させると良い。
(Deposit removal process)
In the present invention, the remaining deposits are removed by spraying dry ice particles with high-pressure gas on the deposits solidified in the heating step described above. By solidifying the deposit, the impact can be efficiently transmitted to the deposit when the dry ice particles collide. Further, when dry ice is sublimated, the CO 2 gas easily enters the gap between the deposit and the hot forging die, and the deposit can be easily removed.
The dry ice particles to be used may be in the form of pellets having a diameter of about 3 to 5 mm and a length of about 5 to 10 mm. For example, the dry ice particles may be jetted using compressed air of 1 to 6 bar.
次に本発明の実施形態について、実験結果を例にあげて説明する。
潤滑剤に硝子潤滑剤を用い、離型剤として黒鉛系離型剤を熱間鍛造用金型に塗布してＡｌｌｏｙ７１８合金を１０００℃で熱間鍛造を行った。用いた熱間鍛造後の熱間鍛造用金型には黒鉛系離型剤が付着物として残留していた。
先ず、比較例の試験を行った。
ドライアイスとして、直径が３〜５ｍｍ、長さが５〜１０ｍｍ程度のペレット状の粒子を用意し、ドライアイス噴射装置により圧力３ｂａｒとして前述のドライアイス粒子を付着物に噴射した。その結果を図２に示す。図２に示すように、付着物の一部を完全に除去することができなかった。
続いて、前述の比較例で用いて、一部に付着物が残留した熱間鍛造用金型を用いて、本発明の試験を行った。
先ず、残留する付着物に対してガスバーナーを用いて、付着物を直接加熱した。付着物の加熱温度は約２５０℃であった。加熱した付着物は固化していた。
次に固化させた付着物に対して、前記比較例と同様な条件でドライアイス粒子をドライアイス噴射装置を用いて付着物に噴射した。その結果を図１に示す。
図１に示すように残留付着物は完全に除去され、熱間鍛造用金型表面には金属光沢が認められ、付着物直下に発生したクラック等の欠陥の有無を目視により容易に確認することができた。また、従来手作業では特に除去が困難であった、狭窄部位の付着物に関しても、本発明を利用することで、容易に除去することができた。
Next, embodiments of the present invention will be described by taking experimental results as examples.
A glass lubricant was used as the lubricant, a graphite release agent was applied as a release agent to the hot forging die, and the Alloy 718 alloy was hot forged at 1000 ° C. The graphite mold release agent remained as a deposit on the hot forging die used after the hot forging.
First, the comparative example was tested.
As dry ice, pellet-shaped particles having a diameter of about 3 to 5 mm and a length of about 5 to 10 mm were prepared, and the above-mentioned dry ice particles were sprayed onto the deposits at a pressure of 3 bar by a dry ice spraying device. The result is shown in FIG. As shown in FIG. 2, some of the deposits could not be completely removed.
Subsequently, the test of the present invention was performed using a hot forging die in which deposits remained in a part of the sample as used in the comparative example described above.
First, the deposit was directly heated using a gas burner for the remaining deposit. The heating temperature of the deposit was about 250 ° C. The heated deposit was solidified.
Next, with respect to the solidified deposit, dry ice particles were sprayed onto the deposit using a dry ice spraying device under the same conditions as in the comparative example. The result is shown in FIG.
As shown in Fig. 1, the residual deposit is completely removed, the metallic luster is recognized on the surface of the hot forging die, and the presence or absence of defects such as cracks directly under the deposit should be easily confirmed visually. I was able to. In addition, deposits on stenotic sites, which have been particularly difficult to remove by conventional manual work, can be easily removed by using the present invention.
１ 熱間鍛造用金型
２ 残留付着物
1 Hot forging die 2 Residual deposits
Claims (1)
熱間鍛造用金型に残留する付着物を加熱して固化させる加熱工程と、
固化させた残留付着物に対し、ドライアイス粒子を高圧ガスで吹き付けて残留した付着物を除去する付着物除去工程と、
を含むことを特徴とする熱間鍛造用金型の残留付着物の除去方法。 A method for removing residual deposits from a hot forging die that has been forged using a metal material as a forging material,
A heating step of heating and solidifying the deposits remaining in the hot forging die;
A deposit removal step of removing residual deposits by spraying dry ice particles with high-pressure gas on the solidified residue deposits;
A method for removing residual deposits from a hot forging die, comprising:
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| JP2013075841A JP2014200793A (en) | 2013-04-01 | 2013-04-01 | Removal method of residual deposit for hot forging mold |
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| JP2013075841A JP2014200793A (en) | 2013-04-01 | 2013-04-01 | Removal method of residual deposit for hot forging mold |
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| JP2014200793A true JP2014200793A (en) | 2014-10-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525810A (en) * | 2014-12-22 | 2015-04-22 | 西安西工大超晶科技发展有限责任公司 | Titanium alloy forging semi-hot state precision die forging forming process |
| CN110337335A (en) * | 2016-12-21 | 2019-10-15 | 日立金属株式会社 | It is hot-forged the manufacturing method of material |
-
2013
- 2013-04-01 JP JP2013075841A patent/JP2014200793A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525810A (en) * | 2014-12-22 | 2015-04-22 | 西安西工大超晶科技发展有限责任公司 | Titanium alloy forging semi-hot state precision die forging forming process |
| CN110337335A (en) * | 2016-12-21 | 2019-10-15 | 日立金属株式会社 | It is hot-forged the manufacturing method of material |
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