JPH09225580A - Manufacture of porous metallic mold - Google Patents
Manufacture of porous metallic moldInfo
- Publication number
- JPH09225580A JPH09225580A JP3627196A JP3627196A JPH09225580A JP H09225580 A JPH09225580 A JP H09225580A JP 3627196 A JP3627196 A JP 3627196A JP 3627196 A JP3627196 A JP 3627196A JP H09225580 A JPH09225580 A JP H09225580A
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- electric discharge
- treatment
- mold
- discharge machining
- 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
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、連続空孔を有する
焼結体に表面処理を施す多孔質金型の製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous mold for surface-treating a sintered body having continuous pores.
【０００２】[0002]
【従来の技術】近年、鋳造用金型として、ガス抜き性や
保温性に優れるという利点から、多孔質金型が使用され
つつある。この種の多孔質金型を製造する際には、先
ず、連続空孔を有する焼結体を成形した後、この焼結体
に切削または研削加工を施して所定形状のキャビテイ面
成形部位を設ける。さらに、鋳造される溶融金属、例え
ば、アルミニウムと金型材とが冶金的に反応し、焼付け
や溶損等が生じて金型の耐久性が低下することを阻止す
るため、キャビテイ面成形部位に、塩浴窒化法、ガス窒
化法または流動層窒化法等の窒化処理や、ＰＶＤまたは
ＣＶＤ等の蒸着処理等の表面処理が施されている。2. Description of the Related Art In recent years, a porous mold has been used as a casting mold because it has excellent gas releasing property and heat retaining property. When manufacturing this type of porous mold, first, a sintered body having continuous pores is formed, and then the sintered body is cut or ground to provide a cavity surface forming portion having a predetermined shape. . Further, the molten metal to be cast, for example, metallurgically reacts with aluminum and the mold material, in order to prevent the durability of the mold from decreasing due to baking and melting loss, in the cavity surface molding site, Surface treatment such as nitriding treatment such as salt bath nitriding method, gas nitriding method or fluidized bed nitriding method and vapor deposition treatment such as PVD or CVD is performed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
ように、焼結体の形状加工に砥石等による研削加工や切
削加工が施されると、この焼結体の表面にばり等が発生
する。このため、焼結体の表面側の空孔が塞がってしま
い、通気性が低下するという問題が指摘されている。However, as described above, when the shape of the sintered body is ground or cut with a grindstone or the like, burrs or the like are generated on the surface of the sintered body. For this reason, it has been pointed out that the pores on the surface side of the sintered body are closed and the air permeability is lowered.
【０００４】さらに、多孔質金型の表面処理として、塩
浴窒化法を用いると、焼結体内の連続空孔を通じて処理
塩がこの焼結体の内部まで浸透し、前記焼結体内部まで
窒化されて多孔質金型全体の靭性が低下してしまう。し
かも、焼結体内部に侵入した処理塩を除去する作業が相
当に煩雑なものになるという問題がある。また、ガス窒
化法を用いると、処理ガスが焼結体の内部まで侵入して
しまい、この焼結体全体が窒化され、多孔質金型全体の
靭性が低下するおそれがある。Further, when the salt bath nitriding method is used as the surface treatment of the porous mold, the treated salt permeates into the inside of the sintered body through the continuous pores in the sintered body and nitrides the inside of the sintered body. As a result, the toughness of the entire porous mold is reduced. Moreover, there is a problem that the work of removing the treated salt that has penetrated into the inside of the sintered body becomes considerably complicated. Further, when the gas nitriding method is used, the processing gas may enter the inside of the sintered body, and the entire sintered body may be nitrided, so that the toughness of the entire porous mold may be reduced.
【０００５】さらにまた、流動層窒化法を用いると、加
熱媒体の砂礫が焼結体表面の空孔に侵入してしまい、そ
の除去作業に多数の工程を要するという不具合がある。Furthermore, when the fluidized bed nitriding method is used, there is a problem that the gravel of the heating medium enters the pores on the surface of the sintered body, and a large number of steps are required for the removal work.
【０００６】一方、表面処理として、ＰＶＤやＣＶＤ等
の蒸着法を用いると、処理時に高真空度（１０-4〜１０
-2ｔｏｒｒ）を要するため、焼結体の洗浄および乾燥に
相当に長時間を要してしまう。焼結体の加工時に、この
焼結体内部に侵入した切削液や研削液を確実に除去して
いないと、蒸着処理装置の内部が汚染されるとともに、
所望の真空度を得ることができないからである。On the other hand, if a vapor deposition method such as PVD or CVD is used as the surface treatment, a high degree of vacuum (10 −4 to 10 −10) is applied during the treatment.
Since it requires -2 torr), it takes a considerably long time to clean and dry the sintered body. If the cutting fluid or grinding fluid that has entered the inside of the sintered body is not reliably removed during processing of the sintered body, the inside of the vapor deposition processing device will be contaminated and
This is because the desired degree of vacuum cannot be obtained.
【０００７】本発明は、この種の問題を解決するもので
あり、所望の通気性および靭性を確保するとともに、簡
単かつ効率的に表面処理を行うことが可能な多孔質金属
の製造方法を提供することを目的とする。The present invention solves this kind of problem, and provides a method for producing a porous metal which can secure desired air permeability and toughness and can perform surface treatment easily and efficiently. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】前記の課題を解決するた
めに、本発明は、連続空孔を有する焼結体に放電加工を
施して所定形状に成形するため、ばり等が発生すること
がなく、前記焼結体の表面に設けられている空孔が閉塞
されることを阻止できる。さらに、放電加工後のキャビ
テイ面成形部位にイオン窒化処理が施される。このイオ
ン窒化処理は、例えば、グロー放電によりなされ、キャ
ビテイ面成形部位の表面にのみ窒化が行われる。これに
より、多孔質金型全体の靭性を有効に維持することがで
きるとともに、表面処理が迅速かつ簡単に遂行される。In order to solve the above problems, according to the present invention, a sintered body having continuous pores is subjected to electric discharge machining to be molded into a predetermined shape, so that burrs or the like may occur. It is possible to prevent the pores provided on the surface of the sintered body from being blocked. Further, the nitriding treatment is applied to the cavity surface forming portion after the electric discharge machining. This ion nitriding treatment is performed by glow discharge, for example, and nitriding is performed only on the surface of the cavity surface forming portion. As a result, the toughness of the entire porous mold can be effectively maintained, and the surface treatment can be performed quickly and easily.
【０００９】[0009]
【発明の実施の形態】図１は、本実施形態に係る製造方
法により製造された多孔質金型である下型１０と上型１
２とを組み込む低圧鋳造金型１４の縦断説明図である。
下型１０は、下型ベース１６に保持されており、そのキ
ャビテイ面１８には湯口２０が連通している。上型１２
は、上型ベース２２に支持されるとともに、そのキャビ
テイ面２４が下型１０のキャビテイ面１８に対向して設
けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a lower mold 10 and an upper mold 1 which are porous molds manufactured by a manufacturing method according to this embodiment.
It is a longitudinal section explanatory view of the low pressure casting metallic mold 14 which incorporates 2 and.
The lower die 10 is held by a lower die base 16, and a cavity surface 18 thereof communicates with a sprue 20. Upper mold 12
Is supported by the upper die base 22, and its cavity surface 24 is provided so as to face the cavity surface 18 of the lower die 10.
【００１０】キャビテイ面１８、２４間にキャビテイ２
６が形成され、このキャビテイ２６には、上型ベース２
２に摺動自在に設けられている押出ピン２８が臨入自在
である。下型１０および上型１２には、それぞれ所望の
位置に冷却経路３０が設けられている。A cavity 2 is provided between the cavity surfaces 18 and 24.
6 is formed, and in this cavity 26, the upper mold base 2
A push-out pin 28 slidably provided in 2 is freely enterable. The lower mold 10 and the upper mold 12 are each provided with a cooling path 30 at a desired position.
【００１１】図２には、放電加工装置４０の概略構成図
が示されている。放電加工装置４０は、導電性を有する
焼結体４２を浸漬する絶縁性放電加工液４４が貯留され
た槽体４６と、ＮＣ装置４８を介して所定方向に移動自
在な放電電極５０とを備える。放電電極５０と焼結体４
２とは、パルス電源５２に接続されるとともに、ＮＣ装
置４８は、ＮＣ制御部５４に接続されている。FIG. 2 shows a schematic configuration diagram of the electric discharge machine 40. The electric discharge machine 40 includes a tank body 46 in which an insulating electric discharge machine liquid 44 in which a conductive sintered body 42 is dipped is stored, and a discharge electrode 50 movable in a predetermined direction via an NC device 48. . Discharge electrode 50 and sintered body 4
2 is connected to the pulse power supply 52, and the NC device 48 is connected to the NC control unit 54.
【００１２】図３には、放電加工後の焼結体４２ａ、４
２ｂのキャビテイ面成形部位５６ａ、５６ｂに、それぞ
れ下型１０、上型１２のキャビテイ面１８、２４に対応
してイオン窒化処理を行うためのイオン窒化装置６０が
示されている。FIG. 3 shows sintered bodies 42a, 4 after electrical discharge machining.
An ion nitriding apparatus 60 for performing an ion nitriding treatment on the cavity surface forming portions 56a and 56b of 2b corresponding to the cavity surfaces 18 and 24 of the lower mold 10 and the upper mold 12, respectively is shown.
【００１３】イオン窒化装置６０は、焼結体４２ａ、４
２ｂを載置するための受台６２が配置された真空容器６
４を備える。この真空容器６４の室６６には、反応ガス
流量調整弁６８に接続された供給管７０が連通するとと
もに、圧力調整弁７２および真空排気装置７４に接続さ
れた排気管７６が連通する。真空容器６４には、プラズ
マ電源７８が接続されている。The ion nitriding apparatus 60 comprises sintered bodies 42a, 4
Vacuum container 6 in which pedestal 62 for placing 2b is arranged
4 is provided. A supply pipe 70 connected to a reaction gas flow rate adjusting valve 68 is connected to the chamber 66 of the vacuum container 64, and an exhaust pipe 76 connected to a pressure adjusting valve 72 and a vacuum exhaust device 74 is connected to the chamber 66. A plasma power supply 78 is connected to the vacuum container 64.
【００１４】次に、本実施形態に係る製造方法につい
て、図４に示すフローチャートを参照しながら、以下に
説明する。Next, the manufacturing method according to this embodiment will be described below with reference to the flowchart shown in FIG.
【００１５】先ず、鉄系材料を主成分とする粉末を用
い、圧粉プレス成形により成形した後、真空炉で焼結し
て連続空孔を有する焼結体４２が成形される（ステップ
Ｓ１）。次に、ステップＳ２に進んで、焼結体４２に必
要部分に機械加工を施し、例えば、冷却経路３０に対応
する加工を行った後、放電加工装置４０によりキャビテ
イ部の放電加工が行われる（ステップＳ３）。First, a powder containing an iron-based material as a main component is used, the powder is compacted by compaction press molding, and then sintered in a vacuum furnace to compact a sintered body 42 having continuous pores (step S1). . Next, the process proceeds to step S2, where necessary parts of the sintered body 42 are machined, for example, the machining corresponding to the cooling path 30 is performed, and then the electrical discharge machining of the cavity portion is performed by the electrical discharge machining device 40 ( Step S3).
【００１６】放電加工装置４０では、図２に示すよう
に、焼結体４２が放電加工液４４中に浸漬された状態
で、パルス電源５２から放電電極５０と前記焼結体４２
とに通電するとともに、ＮＣ制御部５４を介してＮＣ装
置４８が所定の方向に移動される。これにより、焼結体
４２は、そのキャビテイ部側に放電加工が施されて所定
形状に成形される。In the electric discharge machine 40, as shown in FIG. 2, in a state where the sintered body 42 is immersed in the electric discharge machining liquid 44, the electric discharge electrode 50 and the sintered body 42 are supplied from the pulse power source 52.
And the NC device 48 is moved in a predetermined direction via the NC control unit 54. As a result, the sintered body 42 is formed into a predetermined shape by electrical discharge machining on the cavity portion side.
【００１７】このように、焼結体４２のキャビテイ部側
には、放電加工装置４０を介して放電加工が施されるた
め、この焼結体４２の表面に設けられている空孔を閉塞
することがない。従って、研削加工や切削加工等の従来
の処理のように、焼結体４２の表面にばり等が生じてこ
の表面側の空孔が塞がれることにより通気性が低下する
という不具合がなく、電解研摩やエッチング等のような
開孔処理が不要になる。As described above, since the electric discharge machining is performed on the cavity portion side of the sintered body 42 through the electric discharge machine 40, the holes provided on the surface of the sintered body 42 are closed. Never. Therefore, unlike the conventional processing such as grinding and cutting, there is no problem that the surface of the sintered body 42 is burred and the pores on the surface side are closed to lower the air permeability, There is no need for opening treatment such as electrolytic polishing and etching.
【００１８】これにより、所望の通気性を維持して効率
的に焼結体４２を加工することができるという効果が得
られる。しかも、焼結体４２の表面には、放電加工によ
る変質層が存在しており、この変質層が実質的に高硬度
となって、耐摩耗性を向上させるという機能を有する。As a result, the effect that the desired air permeability can be maintained and the sintered body 42 can be processed efficiently can be obtained. Moreover, an altered layer formed by electric discharge machining exists on the surface of the sintered body 42, and this altered layer has a substantially high hardness, and has a function of improving wear resistance.
【００１９】放電加工後の焼結体４２ａ、４２ｂには、
洗浄および乾燥処理が施された後（ステップＳ４）、イ
オン窒化装置６０によるイオン窒化処理が行われる（ス
テップＳ５）。After the electric discharge machining, the sintered bodies 42a and 42b are
After the cleaning and drying processes are performed (step S4), the ion nitriding device 60 performs the ion nitriding process (step S5).
【００２０】イオン窒化装置６０では、図３に示すよう
に、受台６２上に焼結体４２ａ、４２ｂが配置された
後、真空排気装置７４および圧力調整弁７２を介して真
空容器６４の室６６内が減圧される。一方、室６６内に
は、反応ガス流量調整弁６８を介して供給管７０から反
応ガスが供給されるとともに、プラズマ電源７８が駆動
されてグロー放電が行われる。なお、雰囲気温度は、５
００℃〜６００℃の範囲内に設定されている。これによ
り、受台６２上の焼結体４２ａ、４２ｂの表面部（キャ
ビテイ面成形部位５６ａ、５６ｂ）には、イオン窒化処
理が施されることになる。In the ion nitriding apparatus 60, as shown in FIG. 3, after the sintered bodies 42a and 42b are arranged on the pedestal 62, the chamber of the vacuum container 64 is evacuated via the vacuum exhaust device 74 and the pressure adjusting valve 72. The pressure inside 66 is reduced. On the other hand, the reaction gas is supplied from the supply pipe 70 into the chamber 66 through the reaction gas flow rate adjusting valve 68, and the plasma power supply 78 is driven to perform glow discharge. The ambient temperature is 5
It is set within the range of 00 ° C to 600 ° C. As a result, the surface portions (cavity surface forming portions 56a, 56b) of the sintered bodies 42a, 42b on the pedestal 62 are subjected to the ion nitriding treatment.
【００２１】このように、本実施形態では、焼結体４２
ａ、４２ｂの表面処理として、グロー放電を利用したイ
オン窒化処理が施されるため、前記焼結体４２ａ、４２
ｂの表面部にのみ窒化が行われ、該焼結体４２ａ、４２
ｂの内部まで窒化されることがない。As described above, in this embodiment, the sintered body 42 is used.
Since the surface treatment of a and 42b is performed by ion nitriding treatment using glow discharge, the sintered bodies 42a and 42b
Nitriding is performed only on the surface portion of b, and the sintered bodies 42a, 42
The inside of b is not nitrided.
【００２２】従って、塩浴窒化法やガス窒化法等の従来
の窒化処理のように、被処理材の内部まで窒化されて該
被処理材全体の靭性が低下することがなく、焼結体４２
ａ、４２ｂ全体の靭性を有効に維持することができる。
さらに、塩浴窒化法のように、被処理材内部に処理塩が
含浸することがなく、窒化処理後に前記処理塩の除去等
の後処理が不要になり、窒化処理作業が効率的かつ容易
に遂行されるという効果がある。また、処理雰囲気も減
圧ガス雰囲気であり、焼結体４２ａ、４２ｂの清浄度も
ＣＶＤやＰＶＤ等の蒸着法ほど要求されず、窒化処理が
簡素化されるという利点がある。Therefore, unlike the conventional nitriding treatment such as the salt bath nitriding method or the gas nitriding method, the inside of the material to be treated is not nitrided and the toughness of the entire material to be treated is not lowered, and the sintered body 42 is not deteriorated.
The toughness of the entire a and 42b can be effectively maintained.
Further, unlike the salt bath nitriding method, the treatment salt is not impregnated into the material to be treated, and post-treatment such as removal of the treatment salt is not required after the nitriding treatment, which makes the nitriding treatment work efficient and easy It has the effect of being carried out. Further, the processing atmosphere is also a reduced pressure gas atmosphere, the cleanliness of the sintered bodies 42a and 42b is not required as much as the vapor deposition methods such as CVD and PVD, and there is an advantage that the nitriding treatment is simplified.
【００２３】イオン窒化処理によりキャビテイ面成形部
位５６ａ、５６ｂがイオン窒化された焼結体４２ａ、４
２ｂである下型１０、上型１２は、図１に示すように、
低圧鋳造金型１４に組み込まれて調整が行われる（ステ
ップＳ６）。次いで、湯口２０から、例えば、溶融アル
ミニウムがキャビテイ２６に注湯され、このキャビテイ
２６でアルミニウム製成形品が成形されることになる。Sintered bodies 42a, 4a in which the cavity surface forming portions 56a, 56b are ion-nitrided by the ion nitriding treatment.
The lower mold 10 and the upper mold 12 which are 2b are, as shown in FIG.
It is incorporated into the low-pressure casting mold 14 and adjustment is performed (step S6). Next, for example, molten aluminum is poured into the cavities 26 from the sprue 20, and the cavities 26 form an aluminum molded product.
【００２４】[0024]
【実施例】実施例１ 試料として、ＳＵＳ４３０系粉末を圧粉成形プレスによ
り成形した後、真空炉で焼結して空孔率が２５ｖｏｌ％
の連続空孔を有する焼結体を得た。次に、この焼結体の
表面に放電加工を施した後、５８０℃で１０時間、ガス
圧力が２ｔｏｒｒ（Ｎ2 ５０：Ｈ2 ５０）の条件下でイ
オン窒化処理を施した。 Example 1 As a sample, SUS430 series powder was molded by a powder compacting press and then sintered in a vacuum furnace to have a porosity of 25 vol%.
A sintered body having continuous voids was obtained. Next, the surface of this sintered body was subjected to electric discharge machining, and then subjected to ion nitriding treatment at 580 ° C. for 10 hours under a gas pressure of 2 torr (N 2 50: H 2 50).
【００２５】このようにして得られた試料の寸法は、５
０ｍｍ×５０ｍｍ×１０ｍｍであり、窒化層の厚さが６
０μｍで、その硬さがＨｍＶ１２００であった。そし
て、前記試料を７１０℃のアルミニウム（ＡＣ２Ｂ）溶
湯中に４時間浸漬した。The size of the sample thus obtained is 5
0 mm x 50 mm x 10 mm, and the nitride layer has a thickness of 6
The hardness was 0 μm and the hardness was HmV1200. Then, the sample was immersed in a molten aluminum (AC2B) at 710 ° C. for 4 hours.
【００２６】比較例として、上記と同一条件で成形およ
び焼結した試料を用い、この試料の表面に機械加工を施
した状態で、すなわち、表面処理を行うことなくアルミ
ニウム溶湯中に浸漬した。この浸漬後、機械加工かつ表
面処理なしの試料は、図５Ａに示すように、多孔質層９
０の表面に製品であるアルミニウム合金９２との溶着層
９４が存在するとともに、この多孔質層９０に溶損が惹
起されていた。As a comparative example, a sample molded and sintered under the same conditions as above was used, and the surface of this sample was machined, that is, immersed in a molten aluminum without surface treatment. After this dipping, the sample without machining and surface treatment had a porous layer 9 as shown in FIG. 5A.
There was a welded layer 94 with the aluminum alloy 92, which was a product, on the surface of No. 0, and the porous layer 90 was suffered from melting loss.
【００２７】これに対し、放電加工およびイオン窒化処
理を施した試料では、図５Ｂに示すように、多孔質層１
００の表層部にイオン窒化層１０２が設けられており、
このイオン窒化層１０２の表面とアルミニウム製品１０
４との間には、空間ＳＰが存在した。すなわち、実施例
１では、多孔質層１００に溶損や溶着が発生しなかっ
た。実施例２ 試料として、ＳＵＳ４３４系多孔質焼結体（新東工業社
製 ポーセラックス２ＰＭ３５）を用い、そのキャビテ
イ部表面を放電加工した後、５３０℃で６時間、ガス圧
力が２ｔｏｒｒ（Ｎ2 ５０：Ｈ2 ５０）の条件下でイオ
ン窒化処理を施した。この試料を鋳造型の湯口近傍に入
れ子として挿入した。比較例として、上記の焼結体の表
面を放電加工しただけの試料を用意し、同様に、鋳造型
の湯口近傍に入れ子として挿入した。この鋳造型では、
７００℃のＡＣ２Ｂ材を注湯してアルミニウム製品を鋳
造した。On the other hand, in the sample subjected to the electric discharge machining and the ion nitriding treatment, as shown in FIG. 5B, the porous layer 1
An ion nitride layer 102 is provided on the surface layer of 00,
The surface of the ion nitride layer 102 and the aluminum product 10
Between 4 and 4, there was a space SP. That is, in Example 1, the porous layer 100 was not melted or welded. Example 2 As a sample, a SUS434-based porous sintered body (Porcellax 2PM35 manufactured by Shinto Kogyo Co., Ltd.) was used, and the surface of the cavity portion thereof was subjected to electric discharge machining. After that, the gas pressure was 2 torr (N 2 50 : H 2 50). This sample was inserted as a nest near the gate of the casting mold. As a comparative example, a sample in which the surface of the above-mentioned sintered body was simply electric discharge machined was prepared and similarly inserted as a nest near the gate of the casting die. In this casting mold,
Aluminum products were cast by pouring AC2B material at 700 ° C.
【００２８】その結果、図６Ａに示すように、表面に放
電加工を施しただけの入れ子１１０では、８００ショッ
トで溶損部位１１２および溶着が発生したが、放電加工
面にイオン窒化処理を施した入れ子１２０では、５００
０ショットの鋳造後にも溶損および溶着の発生がなかっ
た。As a result, as shown in FIG. 6A, in the insert 110 having only the surface subjected to the electric discharge machining, the melt-damaged portion 112 and the welding were generated in 800 shots, but the electric discharge machined surface was subjected to the ion nitriding treatment. 500 for nested 120
No melting loss or welding occurred even after 0 shot casting.
【００２９】[0029]
【発明の効果】本発明に係る多孔質金型の製造方法で
は、連続空孔を有する焼結体に放電加工を施して所定形
状に成形するため、研削加工や切削加工におけるばり等
の発生がなく、前記焼結体の表面に設けられている空孔
を閉塞することがない。これにより、通気性の低下を阻
止するとともに、開孔処理等の後処理が不要になる。In the method for manufacturing a porous mold according to the present invention, since a sintered body having continuous pores is subjected to electric discharge machining to be formed into a predetermined shape, burrs or the like are not generated in grinding or cutting. In addition, the holes provided on the surface of the sintered body are not blocked. This prevents a decrease in air permeability and eliminates the need for post-processing such as opening processing.
【００３０】さらに、放電加工後の成形部位にイオン窒
化処理が施されるため、この成形部位表面にのみ窒化が
行われ、その内部が窒化されることを阻止することがで
きる。従って、多孔質金型全体の靭性を有効に維持する
とともに、窒化処理後の後処理が不要になり、前記多孔
質金型を効率的かつ高精度に製造することが可能にな
る。Further, since the formed portion after the electric discharge machining is subjected to the ion nitriding treatment, it is possible to prevent only the surface of the formed portion from being nitrided and nitriding the inside thereof. Therefore, it is possible to effectively maintain the toughness of the entire porous mold, and to eliminate the need for post-treatment after the nitriding treatment, so that the porous mold can be manufactured efficiently and highly accurately.
【図１】本発明の実施形態に係る製造方法により製造さ
れる多孔質金型を組み込む低圧鋳造金型の縦断説明図で
ある。FIG. 1 is a vertical cross-sectional explanatory view of a low-pressure casting mold incorporating a porous mold manufactured by a manufacturing method according to an embodiment of the present invention.
【図２】前記製造方法に使用される放電加工装置の概略
説明図である。FIG. 2 is a schematic explanatory view of an electric discharge machine used in the manufacturing method.
【図３】前記製造方法に使用されるイオン窒化装置の概
略説明図である。FIG. 3 is a schematic explanatory view of an ion nitriding device used in the manufacturing method.
【図４】前記製造方法を説明するフローチャートであ
る。FIG. 4 is a flowchart illustrating the manufacturing method.
【図５】図５Ａは、機械加工を行いかつ表面処理がなさ
れていない試料をアルミニウム溶湯中に浸漬した後の溶
着状態を示す拡大図であり、図５Ｂは、放電加工および
イオン窒化処理を施した試料をアルミニウム溶湯中に浸
漬した後の拡大図である。FIG. 5A is an enlarged view showing a welded state after immersing a sample which has been machined and not surface-treated in an aluminum melt, and FIG. 5B is an electric discharge machine and an ion nitriding treatment. It is an enlarged view after immersing the prepared sample in molten aluminum.
【図６】図６Ａは、放電加工のみを施した入れ子の鋳造
後における一部拡大図であり、図６Ｂは、放電加工面に
イオン窒化処理を施した入れ子の鋳造後における一部拡
大図である。FIG. 6A is a partially enlarged view after casting of the insert that has only been subjected to electric discharge machining, and FIG. 6B is a partially enlarged view after casting of the insert that has been subjected to ion nitriding treatment on the electric discharge machined surface. is there.
１０…下型 １２…上型 １４…低圧鋳造金型 １８、２４…キ
ャビテイ面 ２６…キャビテイ ４０…放電加工
装置 ４２、４２ａ、４２ｂ…焼結体 ４４…放電加工
液 ５０…放電電極 ６０…イオン窒
化装置 ６４…真空容器 ６８…反応ガス
流量調整弁 ７８…プラズマ電源10 ... Lower mold 12 ... Upper mold 14 ... Low-pressure casting mold 18, 24 ... Cavity surface 26 ... Cavity 40 ... Electric discharge machine 42, 42a, 42b ... Sintered body 44 ... Electric discharge liquid 50 ... Discharge electrode 60 ... Ion nitriding Apparatus 64 ... Vacuum container 68 ... Reaction gas flow rate adjusting valve 78 ... Plasma power supply
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 8/38 Ｂ２２Ｆ 5/00 Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C23C 8/38 B22F 5/00 F
Claims (3)
空孔を有する焼結体を成形する工程と、 前記焼結体に放電加工を施して所定形状に成形する工程
と、 前記放電加工後のキャビテイ面成形部位にイオン窒化処
理を施す工程と、 を有することを特徴とする多孔質金型の製造方法。1. A step of forming a sintered body having continuous pores using a powder containing an iron-based material as a main component, a step of subjecting the sintered body to electric discharge machining, and forming the sintered body into a predetermined shape, And a step of subjecting the cavity surface forming portion after electric discharge machining to an ion nitriding treatment, the method for producing a porous mold.
系材料は、フェライト系またはマルテンサイト系である
ことを特徴とする多孔質金型の製造方法。2. The method for manufacturing a porous mold according to claim 1, wherein the iron-based material is a ferrite-based material or a martensite-based material.
オン窒化処理は、グロー放電によりなされることを特徴
とする多孔質金型の製造方法。3. The method for manufacturing a porous mold according to claim 1, wherein the ion nitriding treatment is performed by glow discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03627196A JP3548317B2 (en) | 1996-02-23 | 1996-02-23 | Method for manufacturing porous mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03627196A JP3548317B2 (en) | 1996-02-23 | 1996-02-23 | Method for manufacturing porous mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09225580A true JPH09225580A (en) | 1997-09-02 |
| JP3548317B2 JP3548317B2 (en) | 2004-07-28 |
Family
ID=12465111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03627196A Expired - Fee Related JP3548317B2 (en) | 1996-02-23 | 1996-02-23 | Method for manufacturing porous mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3548317B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103492106A (en) * | 2011-02-14 | 2014-01-01 | 新东工业株式会社 | Mold and die metallic material, air-permeable member for mold and die use, and method for manufacturing the same |
| CN109266998A (en) * | 2018-11-13 | 2019-01-25 | 河源佳祺金属塑胶科技有限公司 | A kind of metal die high temperature resistant processing method |
-
1996
- 1996-02-23 JP JP03627196A patent/JP3548317B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103492106A (en) * | 2011-02-14 | 2014-01-01 | 新东工业株式会社 | Mold and die metallic material, air-permeable member for mold and die use, and method for manufacturing the same |
| US9545736B2 (en) | 2011-02-14 | 2017-01-17 | Sintokogio, Ltd. | Mold and die metallic material, air-permeable member for mold and die use, and method for manufacturing the same |
| CN109266998A (en) * | 2018-11-13 | 2019-01-25 | 河源佳祺金属塑胶科技有限公司 | A kind of metal die high temperature resistant processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3548317B2 (en) | 2004-07-28 |
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