JPS63216625A - Electrolytic processing method for small deep hole - Google Patents
Electrolytic processing method for small deep holeInfo
- Publication number
- JPS63216625A JPS63216625A JP4681087A JP4681087A JPS63216625A JP S63216625 A JPS63216625 A JP S63216625A JP 4681087 A JP4681087 A JP 4681087A JP 4681087 A JP4681087 A JP 4681087A JP S63216625 A JPS63216625 A JP S63216625A
- Authority
- JP
- Japan
- Prior art keywords
- tool
- electrolyte
- sludge
- workpiece
- acid
- 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.)
- Pending
Links
- 238000003672 processing method Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 4
- 238000003754 machining Methods 0.000 claims description 10
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 15
- 239000010802 sludge Substances 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 150000001455 metallic ions Chemical class 0.000 abstract 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 230000008961 swelling Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 241000549556 Nanos Species 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ガスタービン動翼の冷却穴に代表される小口
径深穴の電解加工方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for electrolytic machining of small-diameter deep holes, typified by cooling holes of gas turbine rotor blades.
ガスタービン動翼の冷却空気穴のような難切削性材料に
小口径の深穴を穿つときには、電解加工による場合が多
い。When drilling small-diameter deep holes in materials that are difficult to cut, such as cooling air holes in gas turbine rotor blades, electrolytic machining is often used.
その方法は第１図に示すように工具１と加工物２とを夫
々電極とし、工具１を細管形状としてその内部に塩化ナ
トリウム、硝酸ソーダ等の水溶液（以下電解液と云う）
を矢印イの方向に流す。このとき加工物２０表面は電気
化学的に溶融し、スラッジとなって電解液と共に矢印口
の方向に溶出して、工具１の外径に対応した小口径の深
穴が穿たれる。As shown in Fig. 1, the method is as follows: tool 1 and workpiece 2 are used as electrodes, tool 1 is shaped like a thin tube, and an aqueous solution (hereinafter referred to as electrolyte) of sodium chloride, sodium nitrate, etc. is placed inside the tool 1.
flows in the direction of arrow A. At this time, the surface of the workpiece 20 is electrochemically melted and becomes sludge, which is eluted together with the electrolyte in the direction of the arrow, and a deep hole with a small diameter corresponding to the outer diameter of the tool 1 is bored.
電源には低電圧、大電流の直流電源Ｓが使われ、電極間
隙を一定に維持するため、図に示されていない工具１の
送シ制御回路が付加される。A low-voltage, high-current DC power source S is used as the power source, and a feed control circuit for the tool 1 (not shown in the figure) is added to maintain a constant electrode gap.
このような技術には下記の問題点があった。 Such technology has the following problems.
（１）加工物２には端子４を介して直流電源のプラス側
が工具１には支持具５に取付ゆられた端子６を介して直
流電源のマイナス側が夫々結合される。(1) The positive side of the DC power source is connected to the workpiece 2 via the terminal 4, and the negative side of the DC power source is connected to the tool 1 via the terminal 6 attached to the support 5 and swung.
第２図にかいて、工具１の端面Ａと加工物の端面Ｂとの
相対形状は図のようになシ、核部に電解液の渦が発生す
る。In FIG. 2, the relative shapes of the end surface A of the tool 1 and the end surface B of the workpiece are as shown in the figure, and a vortex of electrolyte is generated at the core.
この渦に伴う電解液の逆流現象と上述のように工具１が
マイナス電源側にあるために、スラッジＳが吸引されて
工具内面に付着堆積する。Due to the backflow phenomenon of the electrolytic solution accompanying this vortex and the fact that the tool 1 is on the negative power supply side as described above, the sludge S is attracted and deposits on the inner surface of the tool.
（２） このスラッジの堆積は、電解液の流量を減ら
して加工速度を低下させると共に堆積が甚だしいときに
はスラッジ部で短絡し、端面Ａ。(2) This accumulation of sludge reduces the flow rate of the electrolytic solution and slows down the machining speed, and when the accumulation is severe, a short circuit occurs at the sludge part and the end surface A is damaged.
８間の電位差が低下して正常な電解加工が行表われなく
なる。The potential difference between 8 and 8 decreases, and normal electrolytic processing cannot be performed.
（３） このため作業を中断して、工具を取替えたシ
、清掃しているのが現状である。(3) For this reason, the current situation is to stop work and replace tools and clean them.
なお、このような現象を大詰シと呼び、加工途中で一旦
中止して再加工すると核部にふくらみをもった停止痕が
残るが、この現象をスウェリング（８ｖｒｅｌｌｉｎｇ
） という。Note that this phenomenon is called large-scale cutting, and if the processing is stopped mid-way and reprocessed, a stop mark with a bulge will remain at the core, but this phenomenon is called swelling (8vrelling).
).
本発明は従来技術におけるような大詰シやスウェリング
を起こすことのない小口径深穴の電解加工方法を提供し
ようとするものである。The present invention aims to provide a method for electrolytic machining of small-diameter deep holes without causing large clogging or swelling as in the prior art.
本発明は電解液に少量の硝酸を添加して、電解液をｐＨ
１〜３の酸性にすることを特徴とする小口径深穴の電解
加工方法である。In the present invention, a small amount of nitric acid is added to the electrolyte to adjust the pH of the electrolyte.
This is an electrolytic machining method for small-diameter deep holes characterized by making the acidity 1 to 3.
［作用］
電解加工によって発生したスラッジは、酸溶液中では再
び金属イオンとなシ、溶液中に溶融してそのまま外部へ
溶出し、電極へのスラッジの付着、堆積現象が発生する
ことがない。[Function] The sludge generated by electrolytic processing does not turn into metal ions again in the acid solution, melts in the solution, and elutes to the outside as it is, so that the sludge does not adhere to the electrode or accumulate.
加工条件は加工物の材質、穴径、穴深さによって変化す
るが、ニッケル、クロム、コバルト系合金製ガスタービ
ン動翼に小口径、深穴を穿つ場合の最適電解加工条件は
、下記の通シである。Machining conditions vary depending on the material of the workpiece, hole diameter, and hole depth, but the optimal electrolytic machining conditions when drilling small-diameter, deep holes in gas turbine rotor blades made of nickel, chromium, and cobalt alloys are as follows. It is shi.
加工電圧は ａＶ。The processing voltage is aV.
加工速度は ［Ｌ９■／―、
電解液圧力は １４ ｋｇ ／ ｃｄ、電解液温像は
３０℃、
電解液ｐＨは ｔ８゜
々お電解液は硝酸ソーダ（ＮａＮＯｓ）の場合を示す。The processing speed is [L9■/-, the electrolyte pressure is 14 kg/cd, and the electrolyte temperature image is
The temperature is 30℃, the electrolyte pH is t8℃, and the electrolyte is sodium nitrate (NaNOs).
本発明によシ下記の効果をえることができた。 According to the present invention, the following effects could be obtained.
（１）加工中の電極の短絡がない。(1) There is no short circuit of the electrode during processing.
（２） このため大詰シが起らない。(2) For this reason, large scale failure does not occur.
（３）スウェリングもなくなる。(3) Swelling also disappears.
（４）従って生産性、品質も向上する。(4) Productivity and quality are therefore improved.
第１図は電解加工による小口径、深穴の加工状況を示す
説明図、第２図は大詰シの発生状況を示す説明図である
。FIG. 1 is an explanatory diagram showing the machining situation of a small-diameter, deep hole by electrolytic machining, and FIG. 2 is an explanatory diagram showing the occurrence of a large hole.
Claims (1)
酸性にすることを特徴とする小口径深穴の電解加工方法
。A method for electrolytic machining of small-diameter deep holes, characterized by adding a small amount of nitric acid to the electrolytic solution to make the electrolytic solution acidic with a pH of 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4681087A JPS63216625A (en) | 1987-03-03 | 1987-03-03 | Electrolytic processing method for small deep hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4681087A JPS63216625A (en) | 1987-03-03 | 1987-03-03 | Electrolytic processing method for small deep hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63216625A true JPS63216625A (en) | 1988-09-08 |
Family
ID=12757681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4681087A Pending JPS63216625A (en) | 1987-03-03 | 1987-03-03 | Electrolytic processing method for small deep hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63216625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079309C (en) * | 1999-11-24 | 2002-02-20 | 上海交通大学 | Machining process of high-accuracy and great-depth small hole |
-
1987
- 1987-03-03 JP JP4681087A patent/JPS63216625A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079309C (en) * | 1999-11-24 | 2002-02-20 | 上海交通大学 | Machining process of high-accuracy and great-depth small hole |
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