JPS62251018A - Wire for wire electro-discharge machining and manufacture thereof - Google Patents
Wire for wire electro-discharge machining and manufacture thereofInfo
- Publication number
- JPS62251018A JPS62251018A JP61093057A JP9305786A JPS62251018A JP S62251018 A JPS62251018 A JP S62251018A JP 61093057 A JP61093057 A JP 61093057A JP 9305786 A JP9305786 A JP 9305786A JP S62251018 A JPS62251018 A JP S62251018A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- discharge machining
- metal wire
- ceramics
- electro
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000003754 machining Methods 0.000 title abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000000919 ceramic Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 8
- 150000004767 nitrides Chemical class 0.000 claims abstract description 8
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- 238000009763 wire-cut EDM Methods 0.000 claims description 13
- 150000001247 metal acetylides Chemical class 0.000 claims description 4
- 238000001241 arc-discharge method Methods 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910021476 group 6 element Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Insulated Conductors (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ワイヤ放電加工用ワイヤとその製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire for wire electrical discharge machining and a method for manufacturing the same.
従来、ワイヤ放電加工用のワイヤとしては、例えば線径
が０．１ｓ＋ｗ〜１．０ｍｍ程度の銅線、黄銅線あるい
はタングステン線等の金属線がそのまま用いられていた
。Conventionally, metal wires such as copper wires, brass wires, or tungsten wires having a wire diameter of about 0.1 s+w to 1.0 mm have been used as they are as wires for wire electric discharge machining.
所が、ワイヤ放電加工は、水溶液中でワイヤを電極とし
てこれと被加工物との間でアーク放電を起こさせ、被加
工物に電蝕を起こさせてそれの切断加工を行うものであ
るため、当該ワイヤは、放電による熱や被加工物との摩
擦による摩耗が激しくて寿命が短いという欠点があった
。However, wire electrical discharge machining involves using a wire as an electrode in an aqueous solution and causing an arc discharge between the wire and the workpiece, causing electrolytic corrosion to the workpiece and cutting it. However, this wire has the disadvantage that it suffers from severe wear due to heat generated by discharge and friction with the workpiece, and has a short lifespan.
そこでこの発明は、寿命の向上を図ったワイヤ放電加工
用ワイヤとその製造方法を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a wire for wire electrical discharge machining and a method for manufacturing the same, which improves the life of the wire.
この発明のワイヤ放電加工用ワイヤは、金属線の表面を
、元素周期律表のＩＶａ族元素、Ｖａ族元素またはＶＩ
ａ族元素の炭化物、窒化物または炭窒化物より選ばれた
セラミックスで被覆して成ることを特徴とする。The wire for wire electrical discharge machining of the present invention has a metal wire whose surface is made of a group IVa element, a group Va element, or a group VI element of the periodic table of elements.
It is characterized by being coated with a ceramic selected from carbides, nitrides, and carbonitrides of Group A elements.
この発明の製造方法は、金属線を挟むように配置された
少なくとも二つのカソードを用い、アーク放電法によっ
て金属線の表面を、元素周期律表のＩＶａ族元素、Ｖａ
族元素またはＶｉａ族元素の炭化物、窒化物または炭窒
化物より選ばれたセラミックスで被覆することを特徴と
する。The manufacturing method of the present invention uses at least two cathodes disposed to sandwich a metal wire, and uses an arc discharge method to coat the surface of the metal wire with a group IVa element of the periodic table of elements, Va.
It is characterized by being coated with a ceramic selected from carbides, nitrides, and carbonitrides of group elements or Via group elements.
この発明のワイヤは、その表面のセラミックスが導電性
を有しているため、ワイヤ放電加工において電極として
支障なく作用する。しかも、上記セラミックスは、高硬
度であって耐摩耗性に優れていると共に耐熱性にも優れ
ているため、当該ワイヤは、使用時の消耗が非常に少な
く、従って寿命が従来のものに比べて大幅に向上する。Since the wire of the present invention has conductivity on its surface, it functions as an electrode without any problem in wire electrical discharge machining. Furthermore, the above ceramics have high hardness, excellent wear resistance, and excellent heat resistance, so the wire has very little wear and tear during use, and therefore has a longer lifespan than conventional wires. Significantly improved.
一方この発明の製造方法によれば、大きな成膜速度で、
しかも金属線を特に回転させなくても、その外周に均一
に上記のようなセラミックスを被覆して上記のようなワ
イヤを製造することができる。On the other hand, according to the manufacturing method of the present invention, at a high deposition rate,
Moreover, the wire as described above can be manufactured by uniformly coating the outer periphery of the metal wire with the ceramics described above without particularly rotating the metal wire.
第１図は、この発明に係るワイヤ放電加工用ワイヤの一
例を示す拡大断面図である。このワイヤ２は、金属！＋
１４の表面をセラミックス６で被覆して成る。FIG. 1 is an enlarged sectional view showing an example of a wire for wire electrical discharge machining according to the present invention. This wire 2 is metal! +
The surface of 14 is coated with ceramic 6.
金属線４としては、靭性の高いものが好ましく、例えば
銅線、黄銅線、タングステン線等が採り得る。またその
線径は、被加工物等に応じて選定すれば良く、例えば０
．１ｍｍ〜１．０ｍｍ程度である。The metal wire 4 is preferably one with high toughness, such as a copper wire, a brass wire, a tungsten wire, or the like. In addition, the wire diameter may be selected depending on the workpiece etc., for example, 0.
．． It is about 1 mm to 1.0 mm.
セラミックス６としては、Ｔｉ 、Ｚｒ 、Ｈｆのよう
な元素周期律表のＩＶａ族元素、■、Ｎｂ 、 Ｔａの
ようなＶａ族元素またはＣｒ、Ｍｏ、ＷのようなＶＩａ
族元素の炭化物（例えばＴｉｃ、ＷＣ等）、窒化物（例
えばＴ ｉ Ｎ等）または炭窒化物（例えばＴ１ＣＮ等
）から選ばれる。これらはいずれも導電性を有している
。その場合、セラミックス６の組成は化学量論組成のも
の、例えば窒化チタンを例にとればＴｉＮが望ましいけ
れども、それから幾分外れたもの、例えば窒化チタンを
例にとれはＴ１Ｎｅ、ｓ〜Ｔ ｉ Ｎ ＋ 、 ２程度
の範囲内のものでも良い。またその膜厚は、例えば０．
１μｍ−１０μｍ程度が好ましい。これは、０．１μｍ
未満では金属線４の耐摩耗性、耐熱性向上に殆ど効果が
無く、逆に１０μｍを越えると金属線４の靭性に支障を
来すようになるからである。Ceramics 6 include IVa group elements of the periodic table of the elements such as Ti, Zr, and Hf, Va group elements such as ■, Nb, and Ta, or VIa group elements such as Cr, Mo, and W.
The material is selected from carbides (eg, Tic, WC, etc.), nitrides (eg, T i N, etc.), or carbonitrides (eg, T1CN, etc.) of group elements. All of these have conductivity. In that case, the composition of the ceramic 6 is preferably a stoichiometric composition, for example, TiN in the case of titanium nitride, but it is preferable to have a composition somewhat deviated from the stoichiometric composition, for example, in the case of titanium nitride, it is T1Ne, s~T i N It may be within the range of + or 2. Further, the film thickness is, for example, 0.
The thickness is preferably about 1 μm to 10 μm. This is 0.1 μm
If it is less than 10 μm, there will be little effect on improving the wear resistance and heat resistance of the metal wire 4, and if it exceeds 10 μm, the toughness of the metal wire 4 will be impaired.
上記のようなワイヤ２は、その表面のセラミックス６が
導電性を有しているため、ワイヤ放電加工において電極
として支障なく作用する。しかも上記セラミックス６は
、高硬度（例えば窒化チタンのビッカース硬度Ｈｖは１
５００〜２５００程度である）であって被加工物との耐
摩耗性に優れていると共に耐熱性にも優れているため、
当該ワイヤ２は、使用時の消耗が非常に少なく、従って
寿命が従来のものに比べて大幅に（例えば１０倍程度に
）向上する。それゆえ、当該ワイヤ２を用いればワイヤ
放電加工の経済性が高まる。Since the ceramic 6 on the surface of the wire 2 described above has conductivity, it functions as an electrode without any problem in wire electrical discharge machining. Moreover, the ceramic 6 has a high hardness (for example, the Vickers hardness Hv of titanium nitride is 1
500 to 2,500) and has excellent wear resistance with the workpiece as well as excellent heat resistance.
The wire 2 has very little wear and tear during use, and therefore has a significantly longer lifespan (for example, about 10 times) than conventional wires. Therefore, if the wire 2 is used, the economic efficiency of wire electrical discharge machining will be increased.
次に、上記のようなワイヤ２の製造方法の一例を第２図
を参照しながら説明する。第２図は、この発明に係る製
造方法を実施する装置の一例を示す概略図である。Next, an example of a method for manufacturing the wire 2 as described above will be explained with reference to FIG. 2. FIG. 2 is a schematic diagram showing an example of an apparatus for carrying out the manufacturing method according to the present invention.
真空容器Ｂ内のこの例では上下にそれぞれ、アーク放電
用のカソード１４ａ、１４ｂが、後述する金属線４を挟
んで互いに対向するように配置されており、各カソード
１４ａ、１４ｂにはアーク電源１６ａ、１６ｂがそれぞ
れ接続されている。In this example, cathodes 14a and 14b for arc discharge are disposed on the upper and lower sides of the vacuum vessel B, respectively, so as to face each other across a metal wire 4, which will be described later. , 16b are connected to each other.
尚、アーク放電用のトリガ等は図示を省略している。Note that the trigger for arc discharge and the like are not shown.
上記カソード１４ａ、１４ｂの材質は、金属線４の表面
に被覆しようとするセラミックス６の種類に応じて、元
素周期律表のＩＶａ族元素、Ｖａ族元素またはＶｉａ族
元素から選択される。The material of the cathodes 14a, 14b is selected from group IVa elements, group Va elements, and group Via elements of the periodic table of elements, depending on the type of ceramic 6 to be coated on the surface of the metal wire 4.
金属線４の表面をセラミックス６で被覆するに際しては
、まず、例えばトリクレン洗浄およびフロン洗浄（必要
に応してフロン超音波洗浄）を行った金属線４を送出し
ローラ２０および巻取りローラ２２に装着して、当該金
属線４がカソード１４ａ、１４ｂ間を送られるようにそ
れらを真空容器８内の所定位置にセットする。そして真
空容器８内を例えば排気口１０を介して例えば１Ｏ−６
Ｔｏｒｒ程度に真空引きした後、真空容器８内に例えば
ガス導入口１２からガスＧを導入して真空容器８内の圧
力を例えば数ｍＴｏｒｒ〜数十ｍＴ。When coating the surface of the metal wire 4 with the ceramics 6, first, the metal wire 4, which has been subjected to, for example, trichlene cleaning and fluorocarbon cleaning (fluorocarbon ultrasonic cleaning if necessary), is placed on the delivery roller 20 and the take-up roller 22. The metal wire 4 is then set at a predetermined position in the vacuum container 8 so that the metal wire 4 is sent between the cathodes 14a and 14b. Then, the inside of the vacuum container 8 is, for example, 1O-6
After evacuation to about Torr, gas G is introduced into the vacuum container 8 from, for example, the gas inlet 12, and the pressure inside the vacuum container 8 is set to, for example, several mTorr to several tens of mT.
ｒｒ程度とする。It should be about rr.
このガスＧの種類も、金属線４の表面に被覆しようとす
るセラミックス６の種類に応じて、例えばそれが炭化物
系の場合はメタンガス、窒化物系の場合は窒素ガス、炭
窒化物系の場合はメタンガスと窒素ガスの混合ガス等か
ら選択される。The type of gas G also depends on the type of ceramic 6 to be coated on the surface of the metal wire 4, for example, methane gas if it is a carbide type, nitrogen gas if it is a nitride type, and nitrogen gas if it is a carbonitride type. is selected from a mixed gas of methane gas and nitrogen gas.
そして、カソード１４ａ、１４ｂにアーク電源１６ａ、
１６ｂから例えば数十Ｖ〜数百Ｖ程度のアーク電圧を印
加してアーク放電を起こさせる。Then, an arc power source 16a is connected to the cathodes 14a and 14b,
An arc voltage of, for example, several tens of volts to several hundred volts is applied from 16b to cause arc discharge.
その場合、この例のように金属線４にバイアス電源２４
から例えば数百Ｖ程度のバイアス電圧を印加するのが好
ましい。そのようにすると、金属線４に対するセラミッ
クス６の密着性が一層良くなるからである。In that case, as in this example, the bias power supply 24 is connected to the metal wire 4.
It is preferable to apply a bias voltage of, for example, several hundred volts. This is because by doing so, the adhesion of the ceramic 6 to the metal wire 4 becomes even better.
アーク放電によって、ガスＧのイオン化とカソード１４
ａ、１４ｂの蒸発と一層イオン化とが行われ、両者が反
応して前述したようなセラミックス６が生成され、これ
が金属線４の表面に入射堆積してその全周を被覆する。Ionization of gas G and cathode 14 by arc discharge
Evaporation and further ionization of a and 14b occur, and the two react to produce the ceramics 6 as described above, which are incidentally deposited on the surface of the metal wire 4 and cover its entire circumference.
この過程がこの例では金属線４を送行させることによっ
て連続して行われ、これによって前述したようなワイヤ
２が連続して製造される。その場合、金属線４表面のセ
ラミックス６の膜厚は、例えば金属線４の送り速度、ア
ーク電流等によって前述したようなものに調整すること
ができる。This process is carried out continuously in this example by feeding the metal wire 4, thereby producing the wires 2 as described above continuously. In that case, the film thickness of the ceramic 6 on the surface of the metal wire 4 can be adjusted to the above-mentioned thickness by, for example, the feeding speed of the metal wire 4, the arc current, and the like.
上記のような製造方法においては、アーク放電法を採用
しているため、大きな成膜速度で金属線４の表面にセラ
ミックス６を形成することができる。しかも、アーク放
電の場合は、電子ビーム蒸発源等と違ってカソード１４
ａ、１４ｂの局部溶解・蒸発であるため、カソード１４
ａ、１４ｂを図示例のように真空容器８の上下に、ある
いはそれ以外に左右等にも自由に配置することが可能で
あり、従って金属線４を特に回転させなくてもその外周
全面に均一にセラミックス６を被覆することができる。In the above manufacturing method, since the arc discharge method is adopted, the ceramics 6 can be formed on the surface of the metal wire 4 at a high deposition rate. Moreover, in the case of arc discharge, unlike electron beam evaporation sources, the cathode 14
Since this is local dissolution and evaporation of a and 14b, the cathode 14
It is possible to freely arrange the wires a and 14b on the top and bottom of the vacuum container 8 as shown in the figure, or on the left and right sides, etc., so that they can be placed uniformly over the entire outer periphery of the metal wire 4 without particularly rotating it. can be coated with ceramics 6.
それゆえ、この製造方法によれば、工程や装置等が簡素
化されると共に生産性も良い。Therefore, according to this manufacturing method, the steps, equipment, etc. are simplified, and productivity is also good.
以上のようにこの発明に係るワイヤ放電加工用ワイヤに
おいては、表面のセラミックスの耐摩耗性および耐熱性
が優れているため、使用時の消耗が非常に少なく、従っ
て寿命が従来のものに比べて大幅に向上する。As described above, the wire for wire electrical discharge machining according to the present invention has excellent abrasion resistance and heat resistance of the ceramic surface, so there is very little wear and tear during use, and therefore the lifespan is longer than that of conventional wires. Significantly improved.
またこの発明に係る製造方法によれば、大きな成膜速度
で、しかも金属線を特に回転させなくても、その外周に
均一に上記のようなセラミックスを被覆することができ
、工程や装置等が簡素化されると共に生産性も良い。Furthermore, according to the manufacturing method of the present invention, the above-mentioned ceramic can be uniformly coated on the outer periphery of the metal wire at a high film formation rate and without particularly rotating the metal wire, and the process and equipment can be easily coated. It is simple and has good productivity.
第１図は、この発明に係るワイヤ放電加工用ワイヤの一
例を示す拡大断面図である。第２図は、この発明に係る
製造方法を実施する装置の一例を示す概略図である。
２・・・この発明に係るワイヤ放電加工用ワイヤ、４・
・・金属線、６・・・セラミックス、８・・・真空容器
、１４ａ、１４ｂ・−・カソード、１６ａ、１６ｂ・・
・アーク電源、Ｇ・・・ガス。
第１図
第２図FIG. 1 is an enlarged sectional view showing an example of a wire for wire electrical discharge machining according to the present invention. FIG. 2 is a schematic diagram showing an example of an apparatus for carrying out the manufacturing method according to the present invention. 2... Wire for wire electrical discharge machining according to the present invention, 4.
...Metal wire, 6...Ceramics, 8...Vacuum container, 14a, 14b...Cathode, 16a, 16b...
・Arc power supply, G...Gas. Figure 1 Figure 2
Claims (2)
ａ族元素またはVIａ族元素の炭化物、窒化物または炭窒
化物より選ばれたセラミックスで被覆して成ることを特
徴とするワイヤ放電加工用ワイヤ。(1) The surface of the metal wire is
A wire for wire electrical discharge machining, characterized in that it is coated with a ceramic selected from carbides, nitrides, and carbonitrides of group a elements or group VIa elements.
カソードを用い、アーク放電法によって金属線の表面を
、元素周期律表のIVａ族元素、Ｖａ族元素またはVIａ族
元素の炭化物、窒化物または炭窒化物より選ばれたセラ
ミックスで被覆することを特徴とするワイヤ放電加工用
ワイヤの製造方法。(2) Using at least two cathodes arranged to sandwich the metal wire, the surface of the metal wire is coated with a carbide or nitride of a group IVa element, a group Va element, or a group VIa element in the periodic table of elements by an arc discharge method. Or a method for manufacturing a wire for wire electrical discharge machining, characterized in that the wire is coated with a ceramic selected from carbonitrides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61093057A JPS62251018A (en) | 1986-04-22 | 1986-04-22 | Wire for wire electro-discharge machining and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61093057A JPS62251018A (en) | 1986-04-22 | 1986-04-22 | Wire for wire electro-discharge machining and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62251018A true JPS62251018A (en) | 1987-10-31 |
Family
ID=14071880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61093057A Pending JPS62251018A (en) | 1986-04-22 | 1986-04-22 | Wire for wire electro-discharge machining and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62251018A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008296350A (en) * | 2007-06-04 | 2008-12-11 | Tokusen Kogyo Co Ltd | Electrode wire for wire electric discharge machining |
| CN109696843A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Countdown display control method, device and the cooking apparatus of cooking apparatus |
| JP2020011369A (en) * | 2018-07-18 | 2020-01-23 | ビーフューチャー メタル グループ リミティッドＢｆｕｔｕｒｅ Ｍｅｔａｌ Ｇｒｏｕｐ Ｌｉｍｉｔｅｄ | Electrode wire for electric discharge processing and method for manufacturing the same |
-
1986
- 1986-04-22 JP JP61093057A patent/JPS62251018A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008296350A (en) * | 2007-06-04 | 2008-12-11 | Tokusen Kogyo Co Ltd | Electrode wire for wire electric discharge machining |
| CN109696843A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Countdown display control method, device and the cooking apparatus of cooking apparatus |
| JP2020011369A (en) * | 2018-07-18 | 2020-01-23 | ビーフューチャー メタル グループ リミティッドＢｆｕｔｕｒｅ Ｍｅｔａｌ Ｇｒｏｕｐ Ｌｉｍｉｔｅｄ | Electrode wire for electric discharge processing and method for manufacturing the same |
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