JP2014237191A - Discharge processing method - Google Patents

Discharge processing method Download PDF

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JP2014237191A
JP2014237191A JP2013120870A JP2013120870A JP2014237191A JP 2014237191 A JP2014237191 A JP 2014237191A JP 2013120870 A JP2013120870 A JP 2013120870A JP 2013120870 A JP2013120870 A JP 2013120870A JP 2014237191 A JP2014237191 A JP 2014237191A
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electric discharge
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discharge machining
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machining method
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JP6153780B2 (en
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土田　浩
Hiroshi Tsuchida
土田　　浩
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Mitutoyo Corp
Mitsutoyo Kiko Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a discharge processing method which suppresses adhesion of processed waste to a finished part.SOLUTION: A discharge processing method uses a discharge processing machine provided with a wire electrode (190), processes a rod-like to-be-processed object (100) having a tip part (101) and a connection part (102) connected continuously to the tip part (101) to obtain a processed body (130) having a finished part (121) and a shank (122) connected continuously to the finished part (121) and includes a step (S2) of processing the connection part (102) into a shape in which the cross sectional area increases continuously as separated from the tip part (102), a step (S3) of finishing the tip part (101) to form a finished part (121) and a step (S4) of subjecting the connection part (102) to discharge processing to form the shank.

Description

本発明は放電加工方法に関する。   The present invention relates to an electric discharge machining method.

ワイヤ電極と被加工物との間にアークを発生させて、アークによる熱を利用して被加工物を加工する放電加工方法がある。   There is an electric discharge machining method in which an arc is generated between a wire electrode and a workpiece, and the workpiece is machined using heat generated by the arc.

例えば、特許文献１では、ワイヤ電極をＶ字状に繰り返し移動させて、溝を被加工体の表面に形成する放電加工方法が開示されている。このような放電加工方法によれば、放電加工中に発生する加工屑のサイズを縮小させることができる。加工屑が小さくなるので、ワイヤ電極と衝突しても、ワイヤ電極が断線しにくい。   For example, Patent Document 1 discloses an electric discharge machining method in which a wire electrode is repeatedly moved in a V shape to form a groove on the surface of a workpiece. According to such an electric discharge machining method, the size of machining waste generated during electric discharge machining can be reduced. Since the machining waste becomes small, the wire electrode is not easily broken even if it collides with the wire electrode.

特許第４５５０５１６号公報Japanese Patent No. 4550516

ところで、すでに仕上げを行った仕上部を有する被加工体を、ワイヤ電極により放電加工することがある。かかる放電加工では、加工屑が仕上部に付着し、仕上部の寸法精度や面粗さを悪化させることがあった。   By the way, a workpiece having a finished surface that has already been finished may be subjected to electric discharge machining with a wire electrode. In such electric discharge machining, machining scraps may adhere to the finish, which may deteriorate the dimensional accuracy and surface roughness of the finish.

例えば、図１４に示す被加工体９００を加工する場合がある。被加工体９００は、仕上部としての接触球９２１と、接触球９２１に連続的につながった接続部９０２と、を有する棒状体である。図１４に示すように、接続部９０２をワイヤ電極９９０により放電加工すると、軸部９２２が形成する。このとき、加工屑が接続部９０２から飛んで、接触球９２１に付着する。これにより、仕上部としての接触球９２１の寸法精度や面粗さが悪化することがある。   For example, the workpiece 900 shown in FIG. 14 may be processed. The workpiece 900 is a rod-shaped body having a contact sphere 921 as a finish and a connection portion 902 continuously connected to the contact sphere 921. As shown in FIG. 14, when the connecting portion 902 is subjected to electric discharge machining with the wire electrode 990, a shaft portion 922 is formed. At this time, the machining waste flies from the connection portion 902 and adheres to the contact ball 921. Thereby, the dimensional accuracy and surface roughness of the contact ball 921 as the finish may be deteriorated.

本発明はこのような状況を鑑みてなされたものであり、加工屑の仕上部への付着を抑制する放電加工方法を提供することを目的とする。   This invention is made | formed in view of such a condition, and it aims at providing the electric discharge machining method which suppresses adhesion to the finishing surface of a process waste.

本発明にかかる放電加工方法は、
ワイヤ電極を備える放電加工機を用いて、
先端部と、前記先端部に連続的につながった接続部と、を有する棒状の被加工体を加工して、仕上部と、前記仕上部に連続的につながった軸部と、を有する加工体を得る加工方法であって、
前記接続部を、前記先端部から離れるにつれて断面積が連続的に増加する形状に加工する工程と、
前記先端部を仕上げして、前記仕上部を形成する工程と、
前記接続部を放電加工して、前記軸部を形成する工程と、を含む。 The electric discharge machining method according to the present invention is:
Using an electric discharge machine with wire electrodes,
A workpiece having a finish and a shaft continuously connected to the finish by processing a rod-like workpiece having a tip and a connection continuously connected to the tip. A processing method for obtaining
Processing the connection part into a shape in which a cross-sectional area continuously increases as the distance from the tip part increases;
Finishing the tip and forming the finish;
Forming the shaft portion by electrical discharge machining of the connecting portion.

このような構成によれば、加工屑の仕上部への付着を抑制することができる。   According to such a configuration, it is possible to suppress adhesion of the processing waste to the finish.

他方、本発明にかかる放電加工方法は、
ワイヤ電極を備える放電加工機を用いて、
すでに仕上げされた仕上部と、前記仕上部に連続的につながった接続部と、を有する棒状の被加工体を放電加工して、前記仕上部と、前記仕上部に連続的につながった軸部と、を有する加工体を得る放電加工方法であって、
前記ワイヤ電極を前記被加工体の軸線に対して傾斜させるように張りつつ前記接続部に接近させて、前記接続部を放電加工して、前記軸部を形成する。 On the other hand, the electric discharge machining method according to the present invention is:
Using an electric discharge machine with wire electrodes,
A rod-like workpiece having an already finished finish and a connecting portion continuously connected to the finish is subjected to electric discharge machining, and the finish and a shaft portion continuously connected to the finish. And an electric discharge machining method for obtaining a workpiece having:
The wire electrode is moved so as to be inclined with respect to the axis of the workpiece, approached to the connecting portion, and the connecting portion is subjected to electric discharge machining to form the shaft portion.

他方、本発明にかかる放電加工方法は、
ワイヤ電極を備える放電加工機を用いて、
すでに仕上げされた仕上部と、前記仕上部に連続的につながった接続部とを有する棒状の被加工体を放電加工して、前記仕上部と、前記仕上部に連続的につながった軸部と、を有する加工体を得る放電加工方法であって、
遮蔽板を前記接続部と対向するように配置するとともに、
前記ワイヤ電極を前記遮蔽板と前記接続部との間に配置して、前記接続部を放電加工して、前記軸部を形成する。 On the other hand, the electric discharge machining method according to the present invention is:
Using an electric discharge machine with wire electrodes,
An electrical discharge machining is performed on a rod-like workpiece having a finished finish and a connection portion continuously connected to the finish, and the finish and a shaft portion continuously connected to the finish. An electric discharge machining method for obtaining a workpiece having
While arranging the shielding plate to face the connection portion,
The wire electrode is disposed between the shielding plate and the connecting portion, and the connecting portion is subjected to electric discharge machining to form the shaft portion.

他方、本発明にかかるプローブは、上記した放電加工方法により得られる。   On the other hand, the probe according to the present invention is obtained by the electric discharge machining method described above.

本発明は、加工屑の仕上部への付着を抑制する放電加工方法を提供することができる。   The present invention can provide an electric discharge machining method that suppresses adhesion of machining scraps to the finish.

第１実施形態にかかる放電加工方法のフローチャートを表す図である。It is a figure showing the flowchart of the electric discharge machining method concerning 1st Embodiment. 被加工体の側面図である。It is a side view of a to-be-processed body. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法により得られたプローブの側面図である。It is a side view of the probe obtained by the electric discharge machining method according to the first embodiment. 第１実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the first embodiment. 第２実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the second embodiment. 第２実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the second embodiment. 第２実施形態にかかる放電加工方法により得られた加工体の側面図であるIt is a side view of the process body obtained by the electric discharge machining method concerning 2nd Embodiment. 第３実施形態にかかる放電加工方法の模式図である。It is a schematic diagram of the electric discharge machining method according to the third embodiment. 関連する放電加工方法の模式図である。It is a schematic diagram of the related electric discharge machining method.

（第１実施形態）
図１を参照しつつ、図２〜９を用いて第１実施形態にかかる放電加工方法について説明する。ここでは、被加工体を加工して、加工体の一例としてプローブを得る場合について説明する。図１は第１実施形態にかかる放電加工方法のフローチャートを示す。図２は被加工体の側面図である。図３〜７、９は、第１実施形態にかかる放電加工方法の模式図を示す。図８は、第１実施形態にかかる放電加工方法により得られたプローブの側面図である。 (First embodiment)
The electric discharge machining method according to the first embodiment will be described with reference to FIGS. Here, a case where a workpiece is processed to obtain a probe as an example of the processed body will be described. FIG. 1 shows a flowchart of an electric discharge machining method according to the first embodiment. FIG. 2 is a side view of the workpiece. 3 to 7 and 9 are schematic views of the electric discharge machining method according to the first embodiment. FIG. 8 is a side view of the probe obtained by the electric discharge machining method according to the first embodiment.

まず、図２に示すように、被加工体１００を準備する。被加工体１００は、導電性を有する材料からなる棒状体である。被加工体１００は、一端部である先端部１０１と、先端部１０１に連続的につながった接続部１０２とを含む。   First, as shown in FIG. 2, a workpiece 100 is prepared. The workpiece 100 is a rod-shaped body made of a conductive material. The workpiece 100 includes a tip portion 101 that is one end portion and a connection portion 102 that is continuously connected to the tip portion 101.

次いで、図３に示すように、先端部１０１を略球状に粗加工し、粗形状部１１１を形成する（先端部粗加工ステップＳ１）。この粗加工は、例えば、ワイヤ電極１９０を備える放電加工機（図示略）を用いて行うことができる。被加工体１００の他端部を放電加工機の把持部（図示略）に把持させて、ワイヤ電極１９０を先端部１０１（図２参照）に接近させて、放電加工して、略球状の粗形状部１１１に加工することができる。   Next, as shown in FIG. 3, the tip portion 101 is roughly processed into a substantially spherical shape to form a rough shape portion 111 (tip portion roughing step S1). This rough machining can be performed using, for example, an electric discharge machine (not shown) including the wire electrode 190. The other end portion of the workpiece 100 is gripped by a gripping portion (not shown) of the electric discharge machine, the wire electrode 190 is brought close to the tip portion 101 (see FIG. 2), electric discharge machining is performed, and a roughly spherical rough shape is obtained. The shape part 111 can be processed.

次いで、図４に示すように、接続部１０２の少なくとも一部を傾斜部１１２に加工する（傾斜形状加工ステップＳ２）。傾斜部１１２は、先端部１０１から離れるにつれて断面積が連続的に増加する形状を有する。このような形状としては、例えば、テーパ形状がある。   Next, as shown in FIG. 4, at least a part of the connecting portion 102 is processed into the inclined portion 112 (inclined shape processing step S2). The inclined portion 112 has a shape in which the cross-sectional area continuously increases as the distance from the tip portion 101 increases. An example of such a shape is a tapered shape.

次いで、図５に示すように、粗形状部１１１を仕上げて、仕上部１２１を形成する（仕上ステップＳ３）。このような仕上げは、例えば、研磨剤（図示略）を粗形状部１１１に塗って、電圧をワイヤ電極に印加しないままワイヤ電極を粗形状部１１１に当接して研磨して行うことができる。また、円筒状の電極を備える放電加工機を用いて行うこともできる。上記したように、傾斜部１１２は先端部１０１から離れるにつれて断面積が連続的に増加する形状を有している。したがって、傾斜部１１２は粗形状部１１１を仕上げる際に加わる力に耐えられるよう必要な機械的強度を備える。   Next, as shown in FIG. 5, the rough shape portion 111 is finished to form a finish 121 (finishing step S3). Such finishing can be performed, for example, by applying a polishing agent (not shown) to the rough shape portion 111 and abutting the wire electrode against the rough shape portion 111 without applying a voltage to the wire electrode. Moreover, it can also carry out using an electric discharge machine provided with a cylindrical electrode. As described above, the inclined portion 112 has a shape in which the cross-sectional area continuously increases as the distance from the tip portion 101 increases. Therefore, the inclined portion 112 has a mechanical strength necessary to withstand the force applied when finishing the rough shape portion 111.

最後に、図６及び７に示すように、傾斜部１１２を軸部１２２に加工する（軸部放電加工ステップＳ４）。加工は、図の右側から左側に向けて（仕上部１２１に近い側から接続部１０２に向かって）行う。ここで、図７に示すように、加工屑が傾斜部１１２から発生して、軸部１２２に付着するものの、仕上部１２１まで到達し難い。また、傾斜部１１２から発生する加工屑の量は、棒状の接続部１０２（図２及び図３参照）をそのまま軸部１２２に放電加工して発生する加工屑の量と比較して、少ない。さらに、傾斜部１１２の径の小さい方から大きい方（断面積の小さい方から大きい方）に向かって加工することになるため、仕上部１２１の近い方では加工屑の発生量が少なく、加工屑が多く発生するときには仕上部１２１から十分に離れた状態にある。これらにより、加工屑の仕上部１２１への付着を抑制することができる。   Finally, as shown in FIGS. 6 and 7, the inclined portion 112 is processed into the shaft portion 122 (shaft electric discharge machining step S4). The processing is performed from the right side to the left side of the drawing (from the side close to the finish portion 121 toward the connecting portion 102). Here, as shown in FIG. 7, although machining waste is generated from the inclined portion 112 and adheres to the shaft portion 122, it is difficult to reach the finishing surface 121. Further, the amount of machining waste generated from the inclined portion 112 is small compared to the amount of machining waste generated when the rod-shaped connecting portion 102 (see FIGS. 2 and 3) is directly subjected to electric discharge machining on the shaft portion 122. Furthermore, since machining is performed from the smaller diameter of the inclined portion 112 toward the larger one (from the smaller sectional area to the larger one), the amount of generated machining waste is small near the finish 121 and the machining waste is reduced. When a large amount of is generated, it is in a state of being sufficiently separated from the finish 121. With these, it is possible to suppress the adhesion of the processing scraps to the finish 121.

上記した全てのステップを経ると、図８に示すように、加工体としてのプローブ１３０を得ることができる。プローブ１３０は、仕上部１２１と、仕上部１２１に連続的につながった軸部１２２を有する。プローブ１３０は、例えば、三次元測定機のプローブとして用いられる。加工屑の仕上部１２１への付着を抑制できるので、仕上部１２１は寸法精度や面粗さを良好に維持しており、プローブの接触球として良好に機能することができる。   After all the steps described above, a probe 130 as a processed body can be obtained as shown in FIG. The probe 130 has a finishing part 121 and a shaft part 122 continuously connected to the finishing part 121. The probe 130 is used as a probe of a coordinate measuring machine, for example. Since the adhesion of the processing waste to the finish 121 can be suppressed, the finish 121 maintains good dimensional accuracy and surface roughness and can function well as a contact ball of the probe.

以上より、本実施形態によれば、加工屑の仕上部１２１への付着を抑制でき、寸法精度や面粗さを良好に維持した仕上部１２１を有するプローブを得ることができる。また、本実施形態によれば、新たな放電加工機を必要とすることなく、既存の放電加工機で実施できる。   As described above, according to the present embodiment, it is possible to obtain a probe having the finishing surface 121 that can suppress the adhesion of the processing scraps to the finishing surface 121 and maintain good dimensional accuracy and surface roughness. Moreover, according to this embodiment, it can implement with the existing electric discharge machine, without requiring a new electric discharge machine.

なお、上記した第１実施形態では、接続部１０２をテーパ形状に加工したが、先端部１０１から離れるにつれて断面積を連続的に増加する形状に加工すればよい。このような形状としては、例えば、図９（ａ）に示すような円弧状や、図９（ｂ）に示すような放物線状が挙げられる。   In the first embodiment described above, the connection portion 102 is processed into a tapered shape, but it may be processed into a shape in which the cross-sectional area continuously increases as the distance from the tip portion 101 increases. Examples of such a shape include an arc shape as shown in FIG. 9A and a parabolic shape as shown in FIG. 9B.

また、上記した第１実施形態では、先端部粗加工ステップＳ１、傾斜形状加工ステップＳ２、仕上ステップＳ３、軸部放電加工ステップＳ４の順に実施したが、必要に応じて先端部粗加工ステップＳ１を省略してもよい。   In the first embodiment described above, the tip roughening step S1, the inclined shape machining step S2, the finishing step S3, and the shaft electric discharge machining step S4 are performed in this order, but the tip roughing step S1 is performed as necessary. It may be omitted.

また、上記した第１実施形態では、先端部粗加工ステップＳ１において、先端部１０１を略球状に粗加工したが、円盤状に粗加工してもよい。   In the first embodiment described above, the tip 101 is roughly processed into a spherical shape in the tip roughing step S1, but may be roughly processed into a disk shape.

（第２実施形態）
次に、図１０〜１２を用いて第２実施形態にかかる放電加工方法について説明する。図１０は、被加工体の側面図を示す。図１１は、第２実施形態にかかる放電加工方法の模式図を示す。図１２は、第２実施形態にかかる放電加工方法により得られた加工体の側面図である。 (Second Embodiment)
Next, the electric discharge machining method according to the second embodiment will be described with reference to FIGS. FIG. 10 shows a side view of the workpiece. FIG. 11 is a schematic diagram of an electric discharge machining method according to the second embodiment. FIG. 12 is a side view of a processed body obtained by the electric discharge machining method according to the second embodiment.

まず、被加工体２００を準備する。図１０に示すように、被加工体２００は、すでに仕上げされた仕上部２０１と、仕上部２０１に連続的につながった接続部２０２とを備える棒状体である。ここで、仕上部２０１は、１回の粗加工を経るだけで、良好な面粗さや寸法精度を得ているものとする。接続部２０２は、仕上部２０１と比較して、大きな径を有する。   First, the workpiece 200 is prepared. As shown in FIG. 10, the workpiece 200 is a rod-like body that includes a finished finish 201 and a connecting portion 202 continuously connected to the finish 201. Here, it is assumed that the finish 201 has a good surface roughness and dimensional accuracy only after one roughing process. The connecting portion 202 has a larger diameter than the finish 201.

図１１に示すように、ワイヤ電極２９０を被加工体２００の軸線Ａに対して傾斜させるように張りつつ接続部２０２に接近させて、接続部２０２を放電加工する。このような放電加工は、例えば、供給ガイド及び回収ガイドの位置を相対的に変更することでワイヤ電極２９０を傾斜させることのできる放電加工機を用いて行うことができる。ワイヤ電極２９０と軸線Ａとの成す角度は、鋭角であると好ましく、さらに好ましくは３０°以下である。   As shown in FIG. 11, the wire electrode 290 is brought close to the connecting portion 202 while being inclined with respect to the axis A of the workpiece 200, and the connecting portion 202 is subjected to electric discharge machining. Such electric discharge machining can be performed using, for example, an electric discharge machine capable of inclining the wire electrode 290 by relatively changing the positions of the supply guide and the collection guide. The angle formed between the wire electrode 290 and the axis A is preferably an acute angle, more preferably 30 ° or less.

ここで、接続部２０２の被加工部２０３が放電加工により加工され、加工屑が被加工部２０３から発生する。このとき、被加工部２０３は仕上部２０１から離れており、加工屑が仕上部２０１に到達しにくい。また、被加工部２０３は被加工体２００の軸線Ａに対して傾斜しているところ、加工屑は被加工部２０３の面に垂直な方向Ｂに飛んでいく。つまり、加工屑は仕上部２０１の方向に向かって飛ばずに、仕上部２０１から離れるようにして飛んでいく。すなわち、加工屑は、仕上部２０１に付着しにくいのである。   Here, the processed portion 203 of the connecting portion 202 is processed by electric discharge machining, and machining waste is generated from the processed portion 203. At this time, the part 203 to be processed is separated from the finish 201, and it is difficult for processing scraps to reach the finish 201. Further, when the workpiece 203 is inclined with respect to the axis A of the workpiece 200, the machining scraps fly in a direction B perpendicular to the surface of the workpiece 203. That is, the processing waste does not fly toward the finish 201 but flies away from the finish 201. That is, it is difficult for processing waste to adhere to the finish 201.

以上より、本実施形態によれば、加工体２３０を得ることができる。図１２に示すように、加工体２３０は、仕上部２０１と、仕上部２０１に連続的につながった接続部２０２とを、有する。放電加工による加工屑が仕上部２０１に付着にくいので、仕上部２０１は、仕上した直後の表面粗さや寸法精度を維持している。すなわち、本実施形態によれば、仕上げ加工をすることなく、粗加工しただけで、良好な面粗さや寸法精度が得られる。つまり、仕上げ加工と粗加工とによる工程を１回の加工工程だけで行うことができる。また、本実施形態によれば、新たな放電加工機や装置を必要とすることなく、既存の放電加工機で実施できる。   As described above, according to the present embodiment, the processed body 230 can be obtained. As illustrated in FIG. 12, the processed body 230 includes a finish portion 201 and a connection portion 202 that is continuously connected to the finish portion 201. Since machining scraps due to electric discharge machining hardly adhere to the finish 201, the finish 201 maintains the surface roughness and dimensional accuracy immediately after finishing. In other words, according to the present embodiment, good surface roughness and dimensional accuracy can be obtained only by roughing without finishing. That is, the finishing process and the roughing process can be performed by a single processing process. Moreover, according to this embodiment, it can implement with the existing electric discharge machine, without requiring a new electric discharge machine and apparatus.

なお、上記した第２実施形態では、ワイヤ電極を直線状に張る放電加工機を利用したが、ワイヤ電極を円弧状に張るワイヤガイドを備える放電加工機を利用してもよい。   In the second embodiment described above, the electric discharge machine that stretches the wire electrode in a straight line is used. However, an electric discharge machine that includes a wire guide that stretches the wire electrode in an arc shape may be used.

（第３実施形態）
次に、図１３を用いて第３実施形態にかかる放電加工方法について説明する。図１３は、第３実施形態にかかる放電加工方法の模式図を示す。ここでは、第２実施形態にかかる放電加工方法と同様に、被加工体２００（図１０参照）を放電加工し、加工体２３０（図１２参照）を形成する場合について説明する。第３実施形態にかかる放電加工方法は、第２実施形態にかかる放電加工方法と共通する構成について、同一の符号を付して、説明する。 (Third embodiment)
Next, an electric discharge machining method according to the third embodiment will be described with reference to FIG. FIG. 13 is a schematic diagram of an electric discharge machining method according to the third embodiment. Here, as in the electric discharge machining method according to the second embodiment, a case will be described in which the workpiece 200 (see FIG. 10) is subjected to electric discharge machining to form the workpiece 230 (see FIG. 12). The electrical discharge machining method according to the third embodiment will be described with the same reference numerals assigned to the same configuration as the electrical discharge machining method according to the second embodiment.

図１３に示すように、遮蔽板３０８を用いて、接続部２０２を放電加工して、仕上部２０１を形成する。遮蔽板３０８は、仕上部２０１を通過させるための通過孔３０９を備える板状体である。遮蔽板３０８は、仕上部２０１を通過孔３０９に通過させる。また、遮蔽板３０８を接続部２０２と対向するように配置する。また、ワイヤ電極２９０を遮蔽板３０８と接続部２０２との間に配置して、接続部２０２の被加工部２０４を放電加工して、仕上部２０１を形成する。   As shown in FIG. 13, the finish portion 201 is formed by subjecting the connecting portion 202 to electric discharge machining using the shielding plate 308. The shielding plate 308 is a plate-like body having a passage hole 309 for allowing the finish 201 to pass therethrough. The shielding plate 308 allows the finish 201 to pass through the passage hole 309. Further, the shielding plate 308 is disposed so as to face the connection portion 202. Further, the wire electrode 290 is disposed between the shielding plate 308 and the connection portion 202, and the processed portion 204 of the connection portion 202 is subjected to electric discharge machining to form the finish 201.

このような放電加工は、遮蔽板３０８とワイヤ電極２９０とを備える放電加工機を利用することができる。放電加工機は、遮蔽板３０８とワイヤ電極２９０とを操作する操作機構を備える。操作機構は、ワイヤ電極２９０の動きに応じて、遮蔽板３０８を操作すると好ましい。また、操作機構は、被加工体２００と遮蔽板３０８とが機械的な干渉を起こさないように、遮蔽板３０８を操作すると好ましい。   For such electric discharge machining, an electric discharge machine including a shielding plate 308 and a wire electrode 290 can be used. The electric discharge machine includes an operation mechanism that operates the shielding plate 308 and the wire electrode 290. The operation mechanism preferably operates the shielding plate 308 in accordance with the movement of the wire electrode 290. The operation mechanism preferably operates the shielding plate 308 so that the workpiece 200 and the shielding plate 308 do not cause mechanical interference.

ここで、接続部２０２の被加工部２０４が放電加工により加工され、加工屑が被加工部２０３から発生する。遮蔽板３０８が配置されているので、加工屑が遮蔽板３０８により進行を妨害されて、仕上部２０１に到達しにくい。すなわち、加工屑は、仕上部２０１に付着しにくいのである。   Here, the processed portion 204 of the connecting portion 202 is processed by electric discharge machining, and machining waste is generated from the processed portion 203. Since the shielding plate 308 is disposed, it is difficult for the processing waste to reach the finish 201 because the progress of the processing scraps is hindered by the shielding plate 308. That is, it is difficult for processing waste to adhere to the finish 201.

接続部２０２の被加工部２０４とワイヤ電極２９０との距離Ｄ１は、１〜２μｍである場合、遮蔽板３０８とワイヤ電極２９０との距離Ｄ２は、４〜６μｍであると好ましく、さらに好ましくは４．５〜５．５μｍである。遮蔽板３０８とワイヤ電極２９０との電位差がゼロであると好ましい。これらによれば、遮蔽板３０８とワイヤ電極２９０との間にアークを発生させることなく、接続部２０２の被加工部２０４とワイヤ電極２９０との間にアークを発生させて、放電加工をより安定して行うことができる。   When the distance D1 between the processed portion 204 of the connecting portion 202 and the wire electrode 290 is 1 to 2 μm, the distance D2 between the shielding plate 308 and the wire electrode 290 is preferably 4 to 6 μm, more preferably 4 .5 to 5.5 μm. The potential difference between the shielding plate 308 and the wire electrode 290 is preferably zero. According to these, without generating an arc between the shielding plate 308 and the wire electrode 290, an arc is generated between the processed portion 204 of the connecting portion 202 and the wire electrode 290, thereby making electric discharge machining more stable. Can be done.

以上より、本実施形態によれば、図１１に示すように、加工体２３０を得ることができる。加工体２３０は、仕上部２０１と、仕上部２０１に連続的につながった接続部２０２とを、有する。放電加工による加工屑が仕上部２０１に付着にくいので、仕上部２０１は、仕上した直後の表面粗さや寸法精度を維持している。また、本実施形態によれば、多種多様な放電加工機において適用することができる。また、本実施形態によれば、仕上げ加工をすることなく、粗加工しただけで、良好な面粗さや寸法精度が得られる。つまり、仕上げ加工と粗加工とによる工程を１回の加工工程だけで行うことができる。   As described above, according to the present embodiment, the processed body 230 can be obtained as shown in FIG. The processed body 230 includes a finishing part 201 and a connecting part 202 continuously connected to the finishing part 201. Since machining scraps due to electric discharge machining hardly adhere to the finish 201, the finish 201 maintains the surface roughness and dimensional accuracy immediately after finishing. Moreover, according to this embodiment, it can apply in a wide variety of electric discharge machines. Further, according to the present embodiment, good surface roughness and dimensional accuracy can be obtained only by roughing without finishing. That is, the finishing process and the roughing process can be performed by a single processing process.

なお、上記した第１実施形態では、被加工体をプローブ形状に加工したが、多種多様な形状に加工してもよい。例えば、仕上部を含む加工体であれば、どのようなもので加工することができる。このような加工体として、例えば、パンチやダイなどの金型が挙げられる。   In the above-described first embodiment, the workpiece is processed into a probe shape, but may be processed into various shapes. For example, if it is a processed body including a finish, it can be processed with any object. Examples of such a processed body include a mold such as a punch or a die.

１００、２００ 被加工体、 １０１ 先端部、 １０２、２０２ 接続部、 ２０３、２０４ 被加工部、 １１１ 粗形状部、 １１２ 傾斜部、
１２１、２０１ 仕上部、 １２２ 軸部、 １３０ プローブ、
２３０ 加工体、 １９０、２９０ ワイヤ電極、
３０８ 遮蔽板、 ３０９ 通過孔 100, 200 workpiece, 101 tip, 102, 202 connecting portion, 203, 204 workpiece, 111 rough shape portion, 112 inclined portion,
121, 201 Finish, 122 Shaft, 130 Probe,
230 workpieces, 190, 290 wire electrodes,
308 Shield plate, 309 Passing hole

Claims (4)

ワイヤ電極を備える放電加工機を用いて、
先端部と、前記先端部に連続的につながった接続部と、を有する棒状の被加工体を加工して、仕上部と、前記仕上部に連続的につながった軸部と、を有する加工体を得る加工方法であって、
前記接続部を、前記先端部から離れるにつれて断面積が連続的に増加する形状に加工する工程と、
前記先端部を仕上げして、前記仕上部を形成する工程と、
前記接続部を放電加工して、前記軸部を形成する工程と、を含む放電加工方法。 Using an electric discharge machine with wire electrodes,
A workpiece having a finish and a shaft continuously connected to the finish by processing a rod-like workpiece having a tip and a connection continuously connected to the tip. A processing method for obtaining
Processing the connection part into a shape in which a cross-sectional area continuously increases as the distance from the tip part increases;
Finishing the tip and forming the finish;
Electric discharge machining the connection portion to form the shaft portion. ワイヤ電極を備える放電加工機を用いて、
すでに仕上げされた仕上部と、前記仕上部に連続的につながった接続部とを有する棒状の被加工体を放電加工して、前記仕上部と、前記仕上部に連続的につながった軸部とを有する加工体を得る放電加工方法であって、
前記ワイヤ電極を前記被加工体の軸線に対して傾斜させるように張りつつ前記接続部に接近させて、前記接続部を放電加工して、前記軸部を形成する放電加工方法。 Using an electric discharge machine with wire electrodes,
An electrical discharge machining is performed on a rod-like workpiece having a finished finish and a connection portion continuously connected to the finish, and the finish and a shaft portion continuously connected to the finish. An electric discharge machining method for obtaining a processed body having:
An electric discharge machining method of forming the shaft portion by causing the wire electrode to approach the connection portion while being inclined so as to be inclined with respect to the axis of the workpiece, and to discharge-process the connection portion. ワイヤ電極を備える放電加工機を用いて、
すでに仕上げされた仕上部と、前記仕上部に連続的につながった接続部とを有する棒状の被加工体を放電加工して、前記仕上部と、前記仕上部に連続的につながった軸部と、を有する加工体を得る放電加工方法であって、
遮蔽板を前記接続部と対向するように配置するとともに、
前記ワイヤ電極を前記遮蔽板と前記接続部との間に配置して、前記接続部を放電加工して、前記軸部を形成する放電加工方法。 Using an electric discharge machine with wire electrodes,
An electrical discharge machining is performed on a rod-like workpiece having a finished finish and a connection portion continuously connected to the finish, and the finish and a shaft portion continuously connected to the finish. An electric discharge machining method for obtaining a workpiece having
While arranging the shielding plate to face the connection portion,
An electric discharge machining method in which the wire electrode is disposed between the shielding plate and the connection portion, the connection portion is subjected to electric discharge machining, and the shaft portion is formed. 前記請求項１乃至３のうちいずれか１つに記載される放電加工方法により得られるプローブ。   A probe obtained by the electric discharge machining method according to any one of claims 1 to 3.
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