JPH02109635A - Electrolytic finishing method for sintered hard metal - Google Patents
Electrolytic finishing method for sintered hard metalInfo
- Publication number
- JPH02109635A JPH02109635A JP26498688A JP26498688A JPH02109635A JP H02109635 A JPH02109635 A JP H02109635A JP 26498688 A JP26498688 A JP 26498688A JP 26498688 A JP26498688 A JP 26498688A JP H02109635 A JPH02109635 A JP H02109635A
- Authority
- JP
- Japan
- Prior art keywords
- time
- pulse current
- work
- electrode
- current
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- 230000000284 resting effect Effects 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 16
- 239000003990 capacitor Substances 0.000 description 7
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 5
- 238000010828 elution Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009760 electrical discharge machining Methods 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000000243 solution 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］
この発明は、電解仕上げ加工方法に係り、特に超硬金属
からなるワークの三次元形状の加工面を短時間かつ高精
度に仕上げる超硬金属の電解仕上げ加工方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrolytic finishing method, particularly for finishing a three-dimensionally shaped surface of a workpiece made of cemented carbide metal in a short time and with high precision. This invention relates to an electrolytic finishing method.
［従来の技術］
従来、金属加工面を仕上げる加工方法としては、例えば
特開昭６２−１８８６２４号公報に開示の電解仕上げ加
工方法が知られている。この電解仕上げ加工方法は、電
極とワークとの間隙に電解液を流動させ、安定した電解
作用を阻害する電解生成物、即ち、溶出した金属化合物
や金属イオン及び水素ガス等を除去しながら、連続パル
ス状の電流をワークから電極に流して加工するものであ
るが、電極とワークとの極間に供給するパルス電流の電
流密度はせいぜい２ＯＡ／ｃｍ２以下である。[Prior Art] Conventionally, as a processing method for finishing a metal processed surface, an electrolytic finishing method disclosed in, for example, Japanese Unexamined Patent Application Publication No. 188624/1988 is known. This electrolytic finishing method involves flowing an electrolytic solution into the gap between the electrode and the workpiece, and continuously removing electrolytic products that inhibit stable electrolytic action, such as eluted metal compounds, metal ions, and hydrogen gas. Processing is performed by passing a pulsed current from the workpiece to the electrode, and the current density of the pulsed current supplied between the electrode and the workpiece is at most 2OA/cm2 or less.
［発明が解決しようとする課題］
ところで、この電解仕上げ加工方法によって、超硬金属
、例えばタングステンカーバイドのワークを仕上げ加工
したところ、ワークの加工面を鏡面状に仕上げることが
困難であるという不都合があった。これは、タングステ
ンカーバイドの結晶組織の結合材として用いられるイオ
ン化傾向の大きいコバルトのみが電解作用によって選択
的に溶出され、タングステンカーバイドの母材金属の結
晶粒が溶出されず、これが表面に露出したままになった
り、また、結合を解かれて脱落した状態になっているこ
とによるものと考えられる。[Problems to be Solved by the Invention] By the way, when a workpiece made of cemented carbide metal, such as tungsten carbide, is finished using this electrolytic finishing method, there is an inconvenience that it is difficult to finish the machined surface of the workpiece to a mirror finish. there were. This is because only cobalt, which has a strong ionization tendency and is used as a binder for the crystal structure of tungsten carbide, is selectively eluted by electrolytic action, and the crystal grains of the base metal of tungsten carbide are not eluted, leaving them exposed on the surface. This is thought to be due to the fact that the bond has been broken and the bond has been broken and fallen off.
そこで、この発明の目的は上述の不都合を除去し、超硬
金属のワークを対象に、その三次元形状の加工面を短時
間かつ高精度に仕上げることができる電解仕上げ加工方
法を実現するにある。Therefore, the purpose of the present invention is to eliminate the above-mentioned disadvantages and to realize an electrolytic finishing method that can finish the three-dimensional machined surface of a cemented carbide workpiece in a short time and with high precision. .
［課題を解決するための手段］
この目的を達成するために、この発明は、静止した電解
液を介して所定の間隙で対設した電極と超硬金属からな
るワークとの極間にパルス電流を供給するとともに、前
記電極とワークとの間隙に生成した電解生成物を除去し
ながらワークを仕上げ加工するものにおいて、前記パル
ス電流を、電流密度が１００Ａ／ｃｍ２以上で、オン時
間が１ｍ ｓ ｅ ｃ以下とするとともに、前記パルス
電流の休止時間を５ｓｅｃ以上としたことを特徴とする
。[Means for Solving the Problems] In order to achieve this object, the present invention applies a pulse current between electrodes and a workpiece made of cemented carbide, which are disposed opposite to each other at a predetermined gap via a stationary electrolyte. The pulse current is applied at a current density of 100 A/cm2 or more and an on-time of 1 ms e. c or less, and the pause time of the pulse current is 5 seconds or more.
［作 用］
この発明の構成によれば、電解加工によって超硬金属を
加工する場合、電極とワーク間に、電流密度が１００Ａ
／ｃｍ２以上でオン時間が１ｍ５ｅｃ以下のパルス電流
を、５ｓｅｃ以上の休止時間でもって供給することによ
り、超硬金属の結合材に加えてその母材金属をもイオン
化させ、高精度な仕上げ面を得る。[Function] According to the configuration of the present invention, when processing cemented carbide metal by electrolytic processing, a current density of 100 A is applied between the electrode and the workpiece.
By supplying a pulsed current with an on-time of 1 m5 ec or less at a temperature of /cm2 or more with a pause time of 5 sec or more, the base metal as well as the bonding material of the cemented carbide is ionized, resulting in a highly accurate finished surface. obtain.
［実施例］
以下、図面を参照してこの発明の実施例を詳細かつ具体
的に説明する。[Embodiments] Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.
第１〜３図は、この発明の一実施例を示すものである。1 to 3 show one embodiment of this invention.
第１図において、この発明を実施し得る電解仕上げ加工
装置１は、電極２を固定する電極固定装置３、ワーク４
を固定するワーク固定装置５、サーボモータ６の回転運
動を往復運動に変換する駆動変換部７、パルス電流を発
生する電源装置８、ヘッド駆動制御部９と加工条件制御
部ＩＯと電解液流制御部１１等からなる制御装置１２、
ワーク４に間する各種データ等を入力する入力装置１３
、電解液を濾過する電解８！濾過装置１４、加工槽１５
等からなる。In FIG. 1, an electrolytic finishing device 1 capable of carrying out the present invention includes an electrode fixing device 3 for fixing an electrode 2, a workpiece 4, and an electrode fixing device 3 for fixing an electrode 2.
A workpiece fixing device 5 that fixes the servo motor 6, a drive conversion section 7 that converts the rotational motion of the servo motor 6 into reciprocating motion, a power supply device 8 that generates a pulse current, a head drive control section 9, a machining condition control section IO, and an electrolyte flow control section. A control device 12 consisting of a section 11 and the like;
Input device 13 for inputting various data etc. for the workpiece 4
, electrolysis to filter the electrolyte 8! Filtration device 14, processing tank 15
Consists of etc.
前記電極固定装置３は、その下部に設けたロッド１６の
下端に、例えば純銅もしくはグラファイトからなる電極
２を、その電極面２ａとワーク４の加工面４ａとが三次
元方向に−様な間隙１７を保つように固定する。この電
極固定装置３は、前記ヘッド駆動制御部９の制御信号に
よるサーボモータ６の回転により上下動し、電極面２ａ
と加工面４ａとを所定の間隙１７に設定する。The electrode fixing device 3 has an electrode 2 made of, for example, pure copper or graphite attached to the lower end of a rod 16 provided at the bottom thereof, and a gap 17 such that the electrode surface 2a and the processed surface 4a of the workpiece 4 are spaced in a three-dimensional direction. Fix it to keep it. This electrode fixing device 3 is moved up and down by the rotation of a servo motor 6 based on a control signal from the head drive control section 9, and the electrode surface 2a
and the processed surface 4a are set at a predetermined gap 17.
前記ワーク固定装置５は、絶縁性の高いグラナイトもし
くはセラミックス製のテーブルで、その上面には例えば
型彫放電加工されたタングステンカーバイド等からなる
超硬金属のワーク４を図示しないセット治具、ネジ等に
より固定する。The workpiece fixing device 5 is a table made of highly insulating granite or ceramics, and on its upper surface, a workpiece 4 of cemented carbide metal made of tungsten carbide or the like subjected to die-carving electrical discharge machining is mounted on a setting jig (not shown), screws, etc. Fix it by.
前記電極２とワーク４との極間に、所定のパルス電流を
供給する電源装置８と、この電源装置８を制御する前記
加工条件制御部１０は、例えば第２図に示す如く構成す
る。A power supply device 8 that supplies a predetermined pulse current between the electrode 2 and the workpiece 4, and the processing condition control section 10 that controls the power supply device 8 are configured as shown in FIG. 2, for example.
即ち、電源装置８は直流電源部１８と充放電部１９とで
構成され、直流電源部１８は、変圧器２０と整流器２１
とからなり、変圧器２０により電圧を所定値に降下させ
整流器２１により整流して直流電流を得て、後述する蓄
電器２２−１〜２２−ｎに供給する。That is, the power supply device 8 includes a DC power supply section 18 and a charging/discharging section 19, and the DC power supply section 18 includes a transformer 20 and a rectifier 21.
The voltage is lowered to a predetermined value by a transformer 20 and rectified by a rectifier 21 to obtain a direct current, which is supplied to capacitors 22-1 to 22-n, which will be described later.
また、充放電部１９は、極間に電荷を放電する複数個の
蓄電器２２−１〜２２−ｎと、これらの各蓄電器２２−
１〜２２−ｎに接続し直流電源部１８側への電荷の逆流
を阻止するダイオード２３−１〜２３−ｎと、放電側へ
電荷を放電させるべく開閉される放電スイッチ２４−１
〜２４−ｎと、前記各蓄電器２２−１〜２２−ｎを所定
に充電すべく前記直流電源部１８からの電源を給断する
充電スイッチ２５とからなる。The charging/discharging unit 19 also includes a plurality of capacitors 22-1 to 22-n that discharge charges between electrodes, and each of these capacitors 22-
Diodes 23-1 to 23-n connected to diodes 1 to 22-n to prevent backflow of charges to the DC power supply section 18 side, and a discharge switch 24-1 that is opened and closed to discharge charges to the discharge side.
24-n, and a charging switch 25 that supplies and disconnects power from the DC power supply section 18 to charge each of the capacitors 22-1 to 22-n to a predetermined value.
前記加工条件制御部ｌＯは、蓄電器２２−１〜２２−ｎ
の充電電圧値を検出する電圧検出器２６と、この電圧検
出器２６で検出した充電電圧値とＤ／Ａ変換器２７から
の出力値とを比較する電圧比較器２８と、この電圧比較
器２８からの出力信号により前記蓄電器２２−１〜２２
−ｎの充電の完了及び開始を検出する充電検出器２９と
、極間に放電される電荷の電流値を検出する電流検出器
３０と、この電流検出器３０で検出した電流値のピーク
値をホールドするピークホールド回路３１と、このピー
クホールド回路３１でホールドしたピーク電流値とＤ／
Ａ変換器３２の出力値とを比較する電流比較器３３と、
所定時間幅のパルスを発生するパルス発生器３６と極間
に放電する電荷の電流波形を設定する電流波形設定器３
７からの入力信号により前記各放電スイッチ２４−１〜
２４−ｎに開閉駆動信号を出力するゲート回路３４と、
前記各蓄電器２２−１〜２２−ｎへ供給する充電電圧値
を設定しその信号を前記Ｄ／Ａ変換器２７に出力する充
電電圧設定器３５と、極間に流れる電流値を設定しその
信号を前記Ｄ／Ａ変換器３２に出力する電流設定器３８
と、前記入力装置１３の入力データ等に基づき加工条件
等を演算Φ処理するＣＰＵ３９と、電極２とワーク４の
接触を検知する接触検知器４０等からなる。The processing condition control unit 10 controls the capacitors 22-1 to 22-n.
a voltage detector 26 that detects the charging voltage value of the voltage detector 26; a voltage comparator 28 that compares the charging voltage value detected by the voltage detector 26 with the output value from the D/A converter 27; The output signals from the capacitors 22-1 to 22
A charge detector 29 detects the completion and start of charging of -n, a current detector 30 detects the current value of the charge discharged between the electrodes, and a peak value of the current value detected by the current detector 30. The peak hold circuit 31 to hold, and the peak current value held by this peak hold circuit 31 and D/
a current comparator 33 that compares the output value of the A converter 32;
A pulse generator 36 that generates a pulse with a predetermined time width and a current waveform setting device 3 that sets the current waveform of the charge discharged between the poles.
Each of the discharge switches 24-1 to 24-1 is activated by an input signal from 7.
a gate circuit 34 that outputs an opening/closing drive signal to 24-n;
A charging voltage setter 35 sets a charging voltage value to be supplied to each of the capacitors 22-1 to 22-n and outputs the signal to the D/A converter 27, and a charging voltage setting device 35 sets a current value flowing between the electrodes and outputs the signal. a current setting device 38 that outputs the current to the D/A converter 32;
, a CPU 39 that calculates and processes machining conditions and the like based on input data and the like from the input device 13, and a contact detector 40 that detects contact between the electrode 2 and the workpiece 4.
なお、図中符号４１は逆起電力によって各放電スイッチ
２４−１〜２４−ｎが破壊するのを防止するダイオード
である。Note that the reference numeral 41 in the figure is a diode that prevents each of the discharge switches 24-1 to 24-n from being destroyed by back electromotive force.
前記入力装置１３は、加工面積Ｓ、仕上げ加工しろ等の
ワーク４に間する各種データ、及び加工条件等を入力す
る。また、前記電解液濾過装置１４は、例えば図示しな
い遠心分離器、液温調整器、フィルタ、電磁弁等を有し
、加工で生じた電解生成物を含む電解液を濾過するとと
もに、濾過した清浄な電解液を、電解液流制御部１１０
制御信号により、前記間隙１７に指向する如く配設した
噴出ノズル４２（第１図参照）から間隙１７に噴出する
。The input device 13 inputs various data related to the workpiece 4 such as the machining area S, finishing machining margin, machining conditions, and the like. Further, the electrolyte filtration device 14 includes, for example, a centrifugal separator, a liquid temperature regulator, a filter, a solenoid valve, etc. (not shown), and filters the electrolyte containing electrolytic products generated during processing, and also filters the filtered clean liquid. The electrolyte flow control unit 110
In response to a control signal, the liquid is ejected into the gap 17 from the ejection nozzle 42 (see FIG. 1) arranged so as to be directed toward the gap 17.
次に、この電解仕上げ加工装置ｌによる仕上げ加工動作
の一例について第３図のフローチャートに基づき説明す
る。Next, an example of the finishing operation by this electrolytic finishing apparatus 1 will be explained based on the flowchart of FIG. 3.
仕上げ加工に際しては、電極固定装置３のロッド１６の
下端に、例えばワーク４を型彫放電加工する際に使用し
た電極２を固定するとともに、ワーク固定装置５にワー
ク４をそれぞれ固定し、電解仕上げ加工装置ｌの電源を
投入（５０） Ｌ／、電極２とワーク４の芯出しく５１
）を行う。During finishing, the electrode 2 used, for example, when performing die-sinking electrical discharge machining on the workpiece 4 is fixed to the lower end of the rod 16 of the electrode fixing device 3, and the workpiece 4 is fixed to the workpiece fixing device 5 for electrolytic finishing. Turn on the power to the processing device L (50) L/, center the electrode 2 and workpiece 4 51
)I do.
芯出し作業の終了後に加工が開始され、電解液供給装置
１４を作動させて加工槽１５内に電解液を供給（５２）
するとともに、所定の加工間隙を維持する位置に電極２
を設定（５３）する。Machining is started after the centering work is completed, and the electrolyte supply device 14 is operated to supply electrolyte into the processing tank 15 (52).
At the same time, the electrode 2 is placed at a position that maintains a predetermined machining gap.
is set (53).
そして、前記間隙１７の電解液が静止（電解液の流れ・
動きが略停止した状態をいう）したら、ワ一り４の加工
面積Ｓに応じた所定の単一のパルス電流を供給（５４）
する、このパルス電流がオフしたら、電極２を上昇させ
ると同時に、前記噴出ノズル４２から電解液を噴出して
間隙１７に電解液の噴流を供給（５５） Ｌ／、所定時
間Ｔ２経過後（５６）に電極２を下降させるとともに噴
流の供給を停止（５７）する、そして、所定時間Ｔ３経
過後（５８）に、前記パルス電流の供給が所定回数か否
かを判断（５９）する。Then, the electrolyte in the gap 17 is stationary (the flow of the electrolyte is
When the movement has almost stopped), a predetermined single pulse current is supplied according to the machining area S of the wire 4 (54).
When this pulse current is turned off, the electrode 2 is raised, and at the same time, the electrolytic solution is ejected from the ejection nozzle 42 to supply a jet of electrolytic solution to the gap 17 (55) L/, after a predetermined time T2 has elapsed (56 ), the electrode 2 is lowered and the jet flow supply is stopped (57), and after a predetermined time T3 has elapsed (58), it is determined whether the pulse current has been supplied a predetermined number of times (59).
ここでステップ（５４）〜（５８）におけるパルス電流
の供給と電極の上下動及び噴流の供給のタイミングを第
４図に示す０図において、ピーク電流密度１ｐが１００
Ａ／ａｍ２以上で、オン時間Ｔ１が１ ｍ ｓ ｅ ｃ
以下のパルス電流が供給され、これがオフすると略同時
に電極２を上昇させるとともに、噴流を供給する。この
噴流は電極２が上昇してから下端位置に再設定されるま
での１２時間連続して供給される。また、電極２の下降
及び噴流の供給停止後は、所定時間をおいて次のパルス
電流が供給されるが、パルス電流がオフしてから次のパ
ルス電流がオンするまでの時間、即ち、パルス電流の休
止時間Ｔ３は５ｓｅｃ以上に設定される。 前記ステッ
プ（５９）でＮＯの場合は、ステップ（５３）に戻り、
ステップ（５９）でＹＥＳ、即ち、単一のパルス電流が
所定回数供給された時点で仕上げ加工を終了（６０）す
る。Here, the timing of supplying the pulse current, moving the electrode up and down, and supplying the jet in steps (54) to (58) is shown in FIG. 4, where the peak current density 1p is 100
A/am2 or more, on time T1 is 1 msec
The following pulsed current is supplied, and almost at the same time as it is turned off, the electrode 2 is raised and a jet stream is supplied. This jet stream is continuously supplied for 12 hours from when the electrode 2 is raised until it is reset to the lower end position. Further, after the electrode 2 is lowered and the jet supply is stopped, the next pulse current is supplied after a predetermined time, but the time from when the pulse current is turned off until the next pulse current is turned on, that is, the pulse The current pause time T3 is set to 5 seconds or more. If NO in step (59), return to step (53);
When the answer is YES in step (59), that is, the single pulse current has been supplied a predetermined number of times, the finishing process is finished (60).
次に、この発明の電解仕上げ加工方法による超硬金属の
仕上げ加工例を第５図のデータに基づき説明する。第５
図は、上記電解仕上げ加工装置１により、
電 極 純銅
ワーク材質 タングステンカーバイド電 解 液
硝酸ナトリウム溶液
（濃度４０％）
の条件のもとに行ったデータである。Next, an example of finishing of cemented carbide metal by the electrolytic finishing method of the present invention will be explained based on the data shown in FIG. Fifth
The figure shows that the above electrolytic finishing equipment 1 is used to perform the following: electrode pure copper work material tungsten carbide electrolyte
This data was obtained under the conditions of a sodium nitrate solution (concentration 40%).
第５図の加工例によれば、ピーク電流密度ｔｐが９０Ａ
／ｃｍ２以下の場合（加工例１．２）、及びオン時間Ｔ
１が３ｍ５ｅｃ以上の場合（加工例１．２．１１）、ま
た、休止時間Ｔ３が３．７ｓｅｃ以下の場合（加工例１
．２．６）は、加工進行度が０かマイナスで加工が進行
していないことがわかる。これは、超硬金属中の成分の
イオン化傾向のみに左右した溶出現象が起こり、ワーク
４表面の凹凸を助長する結果によるものである。According to the processing example shown in FIG. 5, the peak current density tp is 90A.
/cm2 or less (processing example 1.2), and on time T
1 is 3 m5 ec or more (Processing example 1.2.11), and when the downtime T3 is 3.7 sec or less (Processing example 1)
．． In case 2.6), the machining progress is 0 or negative, indicating that machining is not progressing. This is because an elution phenomenon that depends only on the ionization tendency of the components in the cemented carbide occurs, which promotes unevenness on the surface of the workpiece 4.
これに対して、図の加工例３〜５及び７〜１０によれば
加工進行度がプラス側で、ワーク４が加工されているこ
とがわかる。これは、ピーク電流密度Ｉｐが１００Ａ
／ ｃ ｍ２以上で、オン時間ＴＩが２ｍ ｓ ｅ ｃ
以下のパルス電流を、パルス電流の休止時間を５ｓｅｃ
以上として供給すると、超硬金属中の成分のイオン化傾
向の影響が相対的に減少し、ワーク４表面の凹凸にのみ
依存した溶出現象が起り、表面の白部分を積極的に溶出
させて、仕上げ面粗度を向上させる作用が現われたもの
と考えられる。さらに、この加工例によって得られた加
工表面は、急激なイオン化溶出のために酸化皮膜も生成
されず、金属生地のままの特性の表面となるヶ要するに
、電解加工によって超硬金属の仕上げ加工を行う場合、
電流密度の小さいパルス電流を供給すると、イオン化傾
向に左右した溶出現象が起り、比較的溶出し易い金属成
分のみが溶出し、他の溶出しにくい金属成分が残存して
しまうので、−層大きい溶出能力を有する大電流密度の
パルス電流を供給することで、成分のイオン化傾向の差
異を超越して、面粗度の向上が図られるものである。On the other hand, it can be seen that according to machining examples 3 to 5 and 7 to 10 in the figure, the machining progress is on the plus side and the workpiece 4 is being machined. This means that the peak current density Ip is 100A.
/cm m2 or more, on time TI is 2msec
Use the following pulse current with a pulse current pause time of 5 seconds.
When supplied as above, the influence of the ionization tendency of the components in the cemented carbide is relatively reduced, and an elution phenomenon that depends only on the unevenness of the surface of the workpiece 4 occurs, and the white part of the surface is actively eluted and finished. It is thought that the effect of improving surface roughness appeared. Furthermore, the processed surface obtained by this processing example does not produce an oxide film due to rapid ionization elution, and has the same characteristics as a metal material.In short, the finish processing of cemented carbide metal by electrolytic processing is If you do,
When a pulse current with a low current density is supplied, an elution phenomenon that depends on the ionization tendency occurs, and only metal components that are relatively easy to elute are eluted, while other metal components that are difficult to elute remain. By supplying a pulsed current with a high current density, it is possible to overcome the difference in ionization tendency of the components and improve the surface roughness.
このように、この発明に係る超硬金属の電解仕上げ加工
方法にあっては、大電流密度でオン時間が比較的短いパ
ルス電流を比較的長いインターバルをおいて単発的に供
給するため、従来困難であった超硬金属のワークを電解
加工することができ、その加工面の面粗度を向上させる
とともに、金属生地のままの特性を有した高精度な表面
品質が得られる。As described above, in the method for electrolytic finishing of cemented carbide metal according to the present invention, a pulse current with a high current density and a relatively short on-time is supplied singly at relatively long intervals, which is difficult to achieve in the past. It is possible to electrolytically process a cemented carbide metal workpiece, which improves the surface roughness of the machined surface and provides highly accurate surface quality that has the same characteristics as metal fabric.
なお、上記実施例におけるフローチャート及びタイミン
グチャートは一実施例にすぎず、例えば、噴流の供給と
電極２の上昇開始及び噴流の停止と電極２の下降位置停
止とを同時に行っているが、噴流の供給を電極２の上昇
開始より早くしたり、噴流の供給停止を電極２の下降位
置停止より遅くするなど、適宜に変更し得る。Note that the flowchart and timing chart in the above embodiment are only one example, and for example, the supply of the jet, the start of the rise of the electrode 2, the stop of the jet, and the stop of the descending position of the electrode 2 are performed at the same time. It may be changed as appropriate, such as making the supply earlier than the start of the rise of the electrode 2, or making the stop of the jet flow later than the stop of the electrode 2 in its lowered position.
［発明の効果］
以上詳細に説明したように、この発明の構成によれば、
電流密度が１００Ａ ／ ｃ ｍ２以上でパルスのオン
時間が１ ｍ ｓ ｅ ｃ以下のパルス電流を、５ｓｅ
ｃ以上の休止時間でもって供給することにより、電解加
工による仕上タデ加工が困難であった超硬金属の加工面
を短時間かつ高精度に仕上げることができ、省力化が遅
れている金型加工分野での品質向上と自動化を達成する
ことができる等の効果を奏する。[Effects of the Invention] As explained in detail above, according to the configuration of the present invention,
A pulse current with a current density of 100 A/cm2 or more and a pulse on time of 1 msec or less is applied for 5 seconds.
By supplying the machine with a downtime of more than c, it is possible to finish the machined surface of cemented carbide metal, which is difficult to finish by electrolytic machining, in a short time and with high precision, which is useful for mold machining where labor saving is delayed. This has effects such as being able to achieve quality improvement and automation in the field.
第１図はこの発明の電解仕上げ加工装置のブロック図、
第２図は要部のブロック図、第３図は仕上げ加工動作の
一例を示すフローチャート、第４図はタイミングチャー
ト、第５図は加工例を示す図である。
１・・・電解仕上げ加工！ｔｒ置、２・・・電極、４・
・・ワーク、 ８・・・電源装置、９・・・ヘッド駆
動制御部、ｌＯ・・・加工条件制御部１１・・・電解液
流制御部、 １２・・・制御装置、１３・・・入力装置
、 １４・・・電解液濾過装置、１７令・番間隙、
３９◆・◆ＣＰＵ。
Ｉｐ・・・電流密度、Ｔ１・・・オン時間Ｔ３・・・休
止時間。
特許出願人 静岡製機株式会社
代表者 鈴 木 重 夫
第７
図
第３図FIG. 1 is a block diagram of the electrolytic finishing apparatus of this invention.
FIG. 2 is a block diagram of the main parts, FIG. 3 is a flowchart showing an example of finishing machining operation, FIG. 4 is a timing chart, and FIG. 5 is a diagram showing an example of machining. 1... Electrolytic finishing process! tr placement, 2...electrode, 4.
... Workpiece, 8... Power supply device, 9... Head drive control section, IO... Processing condition control section 11... Electrolyte flow control section, 12... Control device, 13... Input Device, 14... Electrolyte filtration device, 17th grade/number gap,
39◆・◆CPU. Ip...Current density, T1...On time T3...Dust time. Patent applicant Shizuoka Seiki Co., Ltd. Representative Shigeo Suzuki Figure 7 Figure 3
Claims (1)
と超硬金属からなるワークとの極間にパルス電流を供給
するとともに、前記電極とワークとの間隙に生成した電
解生成物を除去しながらワークを仕上げ加工するものに
おいて、 ロ、前記パルス電流を、電流密度が１００Ａ／ｃｍ＾２
以上で、オン時間が１ｍｓｅｃ以下とするとともに、 ハ、前記パルス電流の休止時間を５ｓｅｃ以上とした ことを特徴とする超硬金属の電解仕上げ加工方法。[Claims] A. A pulse current is supplied between an electrode and a workpiece made of cemented carbide, which are arranged opposite to each other at a predetermined gap via a stationary electrolyte, and the gap between the electrode and the workpiece is In a device that finishes processing a workpiece while removing generated electrolytic products, (b) The pulse current is applied at a current density of 100 A/cm^2
The above provides an electrolytic finishing method for cemented carbide metal, characterized in that the on time is 1 msec or less, and (c) the pause time of the pulse current is 5 seconds or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26498688A JPH0735004B2 (en) | 1988-10-20 | 1988-10-20 | Electrolytic finishing method for cemented carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26498688A JPH0735004B2 (en) | 1988-10-20 | 1988-10-20 | Electrolytic finishing method for cemented carbide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02109635A true JPH02109635A (en) | 1990-04-23 |
| JPH0735004B2 JPH0735004B2 (en) | 1995-04-19 |
Family
ID=17410978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26498688A Expired - Lifetime JPH0735004B2 (en) | 1988-10-20 | 1988-10-20 | Electrolytic finishing method for cemented carbide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735004B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021525175A (en) * | 2018-05-25 | 2021-09-24 | フラウンホーファー−ゲゼルシャフト ツゥア フェアデルング デア アンゲヴァンドテン フォァシュング エー．ファウ． | Equipment and methods for electrolytic processing of materials |
-
1988
- 1988-10-20 JP JP26498688A patent/JPH0735004B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021525175A (en) * | 2018-05-25 | 2021-09-24 | フラウンホーファー−ゲゼルシャフト ツゥア フェアデルング デア アンゲヴァンドテン フォァシュング エー．ファウ． | Equipment and methods for electrolytic processing of materials |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0735004B2 (en) | 1995-04-19 |
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