Electrochemical machining tool, electrochemical machining device, and blade manufacturing method

Abstract

The present invention comprises: a tool electrode that is cylindrical around the tool axis and that forms an electrolyte solution channel on the inner peripheral side thereof; and an insulating layer formed on the outer peripheral surface of the cylindrical tool electrode. The electrolyte solution channel includes: an outlet formed at the end on a first side, below the first side, and a second side in the axial direction in which the tool axis extends, inside the tool electrode; and a diameter-expanding portion in which the inner diameter thereof gradually increases toward the first side. The end on the first side at the diameter-expanding portion is referred to as an outlet.

Description

Technical area

[0001] The present invention relates to an electrolytic machining tool, an electrolytic machining apparatus provided with the electrolytic machining tool, and a blade manufacturing method using the apparatus.

[0002] Priority is claimed in Japanese Patent Application No. 2022-211124, filed on December 28, 2022, the contents of which are incorporated herein by reference. State of the art

[0003] When forming a hole in a hard-to-cut material where machining is difficult, an electrolytic machining method or a discharge machining method is likely to be used. In particular, an electrolytic machining method is likely to be used when forming a hole with a high aspect ratio in a hard-to-cut material.

[0004] Generally, an electrolytic machining apparatus for performing an electrolytic machining process includes an electrolytic machining tool, a moving mechanism that relatively moves the electrolytic machining tool with respect to a workpiece, a power supply circuit, and an electrolytic solution supply machine. The electrolytic machining tool includes a tool electrode and an insulating layer covering a portion of the tool electrode. The power supply circuit applies a voltage between the tool electrode and the workpiece such that the tool electrode is a negative electrode and the workpiece is a positive electrode.

[0005] The following PTL 1 discloses an electrolytic machining tool of an electrolytic machining apparatus. This electrolytic machining tool includes a tubular tool electrode around a tool axis and an insulating layer covering an outer peripheral surface of the tubular tool axis. Citation listPatent literature

[0006] [PTL 1] Japanese Patent No. 6071742 Summary of the inventionTechnical problem

[0007] In the case of electrolytic machining, it is desirable to increase the value of a current flowing between the tool electrode and the workpiece via the electrolytic solution while suppressing the voltage applied between the tool electrode and the workpiece as much as possible and improve the machining efficiency of the workpiece.

[0008] Therefore, an object of the present disclosure is to provide a technique capable of improving the machining efficiency of a workpiece. Solution to the problem

[0009] According to one aspect of the invention for achieving the above object, there is provided an electrolytic machining tool comprising: a tool electrode that is tubular around a tool axis and of which an inner peripheral side forms an electrolytic solution channel; and an insulating layer formed on an electrode outer peripheral surface, which is an outer peripheral surface of the tubular tool electrode. The electrolytic solution channel includes an outlet formed at one end on a first side among the first side and a second side in an axial direction in which the tool axis extends in the tool electrode, and a diameter-increasing portion in which an inner diameter gradually increases toward the first side. An end on the first side of the diameter-increasing portion is the outlet.

[0010] During electrolytic machining, hydrogen ions or water contained in the electrolytic solution receive electrons from the tool electrode used as a cathode to form hydrogen bubbles. The electrolytic solution channel according to the present aspect has a diameter-increasing portion whose inner diameter gradually increases toward the first side, and an end on the first side in the diameter-increasing portion is an outlet of the electrolytic solution channel. For this reason, in the present aspect, an eddy current of the electrolytic solution is not easily formed on the first side of the tool electrode, and multiple bubbles flow smoothly, and thus, it is possible to suppress the retention of the multiple bubbles between the tool electrode and the workpiece.Therefore, in the present aspect, it is possible to suppress an increase in electrical resistance between the tool electrode and the workpiece, and when the voltage applied between the tool electrode and the workpiece is increased, the value of the current flowing between the tool electrode and the workpiece also increases with an increase in the voltage, and thus it is possible to improve the machining efficiency.

[0011] According to one aspect of the invention, to achieve the above object, there is provided an electrolytic machining apparatus including: the electrolytic machining tool; a power supply circuit configured to apply a voltage between the tool electrode and a workpiece such that the tool electrode of the electrolytic machining tool is a negative electrode and the workpiece to be machined by the electrolytic machining tool is a positive electrode; a moving mechanism configured to relatively move the electrolytic machining tool with respect to the workpiece; an electrolytic solution supply machine configured to supply an electrolytic solution to the electrolytic solution channel; and a controller configured to control the power supply circuit, the moving mechanism, and the electrolytic solution supply machine.

[0012] Since the electrolysis machining apparatus according to the present aspect includes the electrolysis machining tool described above, it is possible to suppress the retention of the plurality of bubbles between the tool electrode and the workpiece, and it is possible to improve the machining efficiency of the workpiece.

[0013] According to one aspect of the invention for achieving the above object, there is provided a blade manufacturing method that performs: an intermediate product forming step of forming a blade intermediate product in which an outer surface of a target shape is formed; a cooling channel forming step of forming a cooling channel within the blade intermediate product; and a finishing step of performing finishing on the blade intermediate product in which the cooling channel is formed. In the cooling channel forming step, the cooling channel is formed in the blade intermediate product by using the electrolytic machining apparatus.

[0014] In the blade manufacturing method according to the present aspect, the cooling channel is formed in the blade intermediate product by using the electrolytic machining device. Therefore, the machining efficiency of the blade intermediate product is improved, and the manufacturing cost of the blade can be reduced. Advantageous effects of the invention

[0015] According to one aspect of the present disclosure, it is possible to improve the machining efficiency of a workpiece. Brief description of the drawings Fig. 1 is a schematic diagram showing a configuration of an electrolysis machining apparatus in an embodiment according to the present disclosure. Fig. 2 is a sectional view of a main part of an electrolysis machining tool in the embodiment according to the present disclosure. Fig. 3 is a sectional view of a main part of an electrolysis machining tool in a comparative example. Fig. 4 is a sectional view of a main part of an electrolysis machining tool in a first modification example of the embodiment according to the present disclosure. Fig. 5 is a sectional view of a main part of an electrolysis machining tool in a second modification example of the embodiment according to the present disclosure. Fig. 6 is a sectional view of a main part of an electrolysis machining tool in a third modification example of the embodiment according to the present disclosure. Fig. 7 is a sectional view of a main part of an electrolysis machining tool in a fourth modification example of the embodiment according to the present disclosure. Fig. 8 is a sectional view of a main part of an electrolysis machining tool in a fifth modification example of the embodiment according to the present disclosure. Fig. 9 is a flowchart showing an execution procedure of a blade manufacturing method in the embodiment according to the present disclosure. Fig. 10 is a sectional view of a blade intermediate product in the embodiment according to the present disclosure. Fig. 11 is a sectional view of a blade intermediate during a cooling channel forming step in the embodiment according to the present disclosure. Fig. 12 is a sectional view of a blade in the embodiment according to the present disclosure. Fig. 13 is a sectional view of a blade in a modification example of the embodiment according to the present disclosure. Description of embodiments

[0016] Hereinafter, various embodiments of the present invention and modification examples thereof will be described in detail with reference to the drawings. [Embodiment of electrolysis processing device]

[0017] Hereinafter, an electrolysis machining apparatus according to an embodiment of the present disclosure will be described with reference to Fig. 1 to 3.

[0018] As in Fig. 1, the electrolysis machining apparatus in the present embodiment includes an electrolysis machining tool 10, a power supply circuit 1, a moving mechanism 2, an electrolytic solution supply machine 3, and a controller 4.

[0019] The electrolytic machining tool 10 includes a tool electrode 11 tubular around a tool axis Δt, an inner peripheral side of which forms an electrolytic solution channel 13, and an insulating layer 21 formed on an outer peripheral surface of the tubular tool electrode 11. The power supply circuit 1 is a circuit capable of applying a voltage between the tool electrode 11 and a workpiece W such that the tool electrode 11 is a negative electrode and the workpiece W to be machined by the electrolytic machining tool 10 is a positive electrode. The moving mechanism 2 is a mechanism that relatively moves the electrolytic machining tool 10 with respect to the workpiece W. The moving mechanism 2 may be a mechanism that moves the electrolytic machining tool 10 or a mechanism that moves the workpiece W.The electrolytic solution supply machine 3 can supply an electrolytic solution to the electrolytic solution channel 13 of the electrolytic machining tool 10. The electrolytic solution supply machine 3 includes a tank 3a in which the electrolytic solution is stored, an electrolytic solution line 3b connecting the tank 3a and the electrolytic solution channel 13 of the electrolytic machining tool 10, and a pump 3c provided in the electrolytic solution line 3b. The electrolytic solution in the present embodiment is, for example, an aqueous nitric acid solution. In addition, the electrolytic solution includes a neutral solution such as an NaCl solution or an NaNO3 solution, an acidic solution such as an aqueous sulfuric acid solution, and the like. The controller 4 can control the operations of the power supply circuit 1, the moving mechanism 2, and the electrolytic solution supply machine 3.

[0020] Here, as in Fig. 2, a direction in which the tool axis At extends is referred to as an axial direction Da, one side in the axial direction Da is referred to as a first side Da1, and the other side in the axial direction Da is referred to as a second side Da2. Moreover, a direction perpendicular to the tool axis At is a radial direction Dr, a side away from the tool axis At in the radial direction Dr is a radial outer side Dro, and a side near the tool axis At in the radial direction Dr is a radial inner side Dri.

[0021] The tool electrode 11 is formed of a metal having conductivity, such as stainless steel, pure Ti, and a Ti alloy. The electrolyte solution channel 13 formed in the tool electrode 11 extends in the axial direction Da around the tool axis At. The electrolyte solution channel 13 has an inlet 13i (see Fig. 1), an outlet 13o, a main channel portion 14, and a diameter-increasing portion 15. The inlet 13i of the electrolyte solution channel 13 is formed at one end of the tool electrode 11 on the second side Da2. The outlet 13o of the electrolyte solution channel 13 is formed at the end of the tool electrode 11 on the radially outer side Dro, that is, at the end of the tool electrode 11 on the first side Da1. The electrolyte solution supplied from the electrolyte solution supply machine 3 flows into the electrolyte solution channel 13 from the inlet 13i and flows out from the outlet 13o. The main channel portion 14 is a portion that has a constant inner diameter in the electrolyte solution channel 13 at any position in the axial direction Da. One end on the second side Da2 of the main channel portion 14 is arranged at a position of one end on the second side Da2 of the tool electrode 11 to form the inlet 13i.The diameter-increasing portion 15 is a portion in which the inner diameter of the electrolyte solution channel 13 gradually increases toward the first side Da1 in the electrolyte solution channel 13. One end of the diameter-increasing portion 15 on the second side Da2 is connected to one end of the main channel portion 14 on the first side Da1. Moreover, one end of the diameter-increasing portion 15 on the first side Da1 is the outlet 13o of the electrolyte solution channel 13. In other words, the end on the first side Da1 of the diameter-increasing portion 15 is the end of the tool electrode 11 on the radially outer side Dro and coincides with the position of the end of the tool electrode 11 on the first side Da1.

[0022] An inner peripheral surface 16 of the tool electrode 11, which defines the diameter-increasing portion 15 of the electrolytic solution channel 13, has a shape along a curved line with a radius of curvature R, with a position on the radially outer side Dro with respect to the inner peripheral surface 16 and on the second side Da2 with respect to the outlet 13o as a center of curvature. For this reason, the inner peripheral surface 16 is a curved surface corresponding to the shape of the inner peripheral surface of a horn. Therefore, the inner peripheral surface 16 is a uniformly continuously curved surface, and the entire inner peripheral surface 16 is a convex curved surface on a side near the tool axis At.

[0023] The insulating layer 21 is formed on an electrode outer peripheral surface 12, which is an outer peripheral surface of the tubular tool electrode 11. The insulating layer 21 has an insulating layer inner peripheral surface 22, an insulating layer outer peripheral surface 23, and a first side insulating layer end surface 24. The insulating layer inner peripheral surface 22 is an inner peripheral surface of the insulating layer 21 and is in contact with the electrode outer peripheral surface 12. The insulating layer outer peripheral surface 23 is an outer peripheral surface of the insulating layer 21. The first side insulating layer end surface 24 is a surface connecting the end on the first side Da1 of the insulating layer inner peripheral surface 22 and the end on the first side Da1 of the insulating layer outer peripheral surface 23.For this reason, the first side insulating layer end surface 24 extends from the end of the electrode outer peripheral surface 12 on the first side Da1 to the end of the insulating layer outer peripheral surface 23 on the first side Da1 toward the radially outer side Dro. The first side insulating layer end surface 24 gradually extends toward the second side Da2 as the first side insulating layer end surface 24 faces the radially outer side Dro. However, the first side insulating layer end surface 24 in a cross section of the tool electrode 11 including the tool axis At has a linear shape. In the present embodiment, in the axial direction Da, the position of the end of the insulating layer inner peripheral surface 22 on the first side Da1 coincides with the position of the end of the electrode outer peripheral surface 12 on the first side Da1.

[0024] In the case of electrolytic machining, it is desirable to increase the value of a current flowing between the tool electrode 11 and the workpiece W via the electrolytic solution, while suppressing the voltage applied between the tool electrode 11 and the workpiece W as much as possible in order to improve machining efficiency. Therefore, the inventor analyzed the flow of the electrolytic solution when an electrolytic machining tool 10 times that used in Fig. 3 is used in the comparative example shown.

[0025] As with the electrolysis machining tool 10 in the present embodiment, the electrolysis machining tool 10x in the comparative example also includes a tool electrode 11x which is tubular around the tool axis At and an inner peripheral side of which forms an electrolytic solution channel 13x, and an insulating layer 21x formed on an electrode outer peripheral surface 12x which is the outer peripheral surface of the tubular tool electrode 11x.

[0026] The electrolyte solution channel 13x formed in the tool electrode 11x extends in the axial direction Da around the tool axis At. The inner diameter of the electrolyte solution channel 13x in the comparative example is a constant inner diameter at any position in the axial direction Da. Therefore, the electrolyte solution channel 13x in the comparative example does not have a portion corresponding to the diameter-increasing portion 15 of the electrolyte solution channel 13 in the present embodiment. An outlet 13ox is formed at a position of one end of the tool electrode 11x on the first side Da1 and one end of the tool electrode 11x on the radially inner side Dri. Therefore, the outlet 13ox of the comparative example is not formed at the position of the end on the radially outer side Dro of the tool electrode 11x, as in the outlet 13o of the present embodiment.

[0027] One end of an inner peripheral surface 16x on the first side Da1 of the tool electrode 11x in the comparative example and one end of the electrode outer peripheral surface 12x on the first side Da1 of the tool electrode 11x are connected by a first side electrode end surface 17x facing the first side Da1. One end of an insulating layer outer peripheral surface 23x on the first side Da1 and one end of an insulating layer inner peripheral surface 22x on the first side Da1 are connected by a first side insulating layer end surface 24x. Both the first side electrode end surface 17x and the first side insulating layer end surface 24x are surfaces perpendicular to the tool axis Δt. Furthermore, the first side insulating layer end surface 24x is flush with the first side electrode end surface 17x.

[0028] As a result of analyzing the flow of the electrolytic solution when using the electrolytic machining tool 10x of the comparative example, the inventor found that multiple eddy currents V of the electrolytic solution are formed along the first side electrode end face 17x and at the region of the first side electrode end face 17x on the first side Da1. This is because when the electrolytic solution flows out from the outlet 13o of the electrolytic solution channel 13, a flow path through which the electrolytic solution flows rapidly extends to the radially outer side Dro.

[0029] During electrolytic machining, hydrogen ions or water contained in the electrolyte solution receive electrons from the tool electrodes 11, 11x serving as cathodes to form hydrogen bubbles B.

[0030] As described above, in the comparative example, the plurality of eddy currents V are formed along the first side electrode end surface 17x and at the region on the first side Da1 of the first side electrode end surface 17x. For this reason, a plurality of bubbles B remain in the plurality of eddy currents V. When the plurality of bubbles B remain between the tool electrode 11x and the workpiece W, electrical resistance between the tool electrode 11x and the workpiece W increases. Therefore, in the comparative example, even if the voltage applied between the tool electrode 11x and the workpiece W is increased, the value of the current flowing between the tool electrode 11x and the workpiece W does not increase in proportion to the change in the voltage, and the machining efficiency of the workpiece W is not very good.

[0031] As described above, the electrolytic solution channel 13 of the present embodiment includes the diameter-increasing portion 15 in which the inner diameter gradually increases toward the first side Da1. Moreover, the inner peripheral surface 16 of the tool electrode 11 defining the diameter-increasing portion 15 is a smoothly continuous curved surface corresponding to the inner peripheral surface of the horn, and the entire inner peripheral surface 16 is a convex curved surface on the side near the tool axis At. For this reason, in the present embodiment, the eddy current V of the electrolytic solution is not substantially formed on the first side Da1 of the tool electrode 11, and the plurality of bubbles B flow smoothly, and thus, it is possible to suppress the retention of the plurality of bubbles B between the tool electrode 11 and the workpiece W.Therefore, in the present embodiment, it is possible to suppress an increase in electrical resistance between the tool electrode 11 and the workpiece W, and when the voltage applied between the tool electrode 11 and the workpiece W is increased, the value of the current flowing between the tool electrode 11 and the workpiece W also increases with an increase in the voltage, and thus the machining efficiency of the workpiece W can be improved.

[0032] Moreover, since the first side insulating layer end surface 24 in the present embodiment gradually extends toward the second side Da2, when the first side insulating layer end surface 24 faces the radially outer side Dro, the bubbles B in the electrolytic solution flowing along the inner peripheral surface 16 of the tool electrode 11 defining the diameter increasing portion 15 are likely to flow toward the insulating layer outer peripheral surface 23 side. For this reason, in the present embodiment, also from this point of view, the plurality of bubbles B flow smoothly, and thus, it is possible to suppress the retention of the plurality of bubbles B between the tool electrode 11 and the workpiece W. [First modification example of electrolysis machining tool]

[0033] A first modification example of the electrolysis machining tool will be described with reference to Fig. 4 described.

[0034] As with the electrolysis machining tool 10 in the above-described embodiment, an electrolysis machining tool 10a in the present modification example also includes a tool electrode 11a which is tubular around the tool axis At and an inner peripheral side of which forms an electrolytic solution channel 13a, and the insulating layer 21 formed on the electrode outer peripheral surface 12 which is the outer peripheral surface of the tubular tool electrode 11a.

[0035] Like the electrolyte solution channel 13 in the above-described embodiment, the electrolyte solution channel 13a in the present modification example also includes the inlet, the outlet 13o, the main channel portion 14, and a diameter-increasing portion 15a. However, the configuration of the diameter-increasing portion 15a in the present modification example differs from the configuration of the diameter-increasing portion 15 in the above-described embodiment.

[0036] The inner peripheral surface 16 of the tool electrode 11 defining the diameter-increasing portion 15 in the above-described embodiment is a curved line defined by a radius of curvature R. On the other hand, the inner peripheral surface 16a of the tool electrode 11a defining the diameter-increasing portion 15a in the present modification example is a curved surface defined by a plurality of radii of curvature R1, R2. The position of the center of curvature with respect to the radius of curvature R1 and the position of the center of curvature with respect to the radius of curvature R2 are both located at a position on the radially outer side Dro with respect to the inner peripheral surface 16a of the tool electrode 11a defining the diameter-increasing portion 15a, and on the second side Da2 with respect to the outlet 13o.A curved surface defined by the radius of curvature R1 and a curved surface defined by the radius of curvature R2 are connected to the curved surface defined by the radius of curvature R1.

[0037] Therefore, as in the above-described embodiment, the inner peripheral surface 16a of the tool electrode 11a defining the diameter-increasing portion 15a in the present modification example is also a curved surface corresponding to the shape of the inner peripheral surface of the horn. For this reason, the inner peripheral surface 16a is also a smoothly continuous curved surface, and the entire inner peripheral surface 16a is a convex curved surface on the side near the tool axis Δt. Therefore, in the electrolytic machining tool 10a in the present modification example, as in the electrolytic machining tool 10 in the above-described embodiment, it is possible to suppress the retention of the plurality of bubbles B between the tool electrode 11a and the workpiece W and to suppress an increase in electrical resistance between the tool electrode 11a and the workpiece W.

[0038] The inner peripheral surface 16a of the tool electrode 11a defining the diameter-increasing portion 15a in the present modification example is a curved surface defined by two radii of curvature R1, R2, but may also be a curved surface defined by three or more radii of curvature. Furthermore, the radius of curvature of the inner peripheral surface 16a may gradually change according to a position change in the axial direction Da, like an ellipse. [Second modification example of electrolysis machining tool]

[0039] A second modification example of the electrolysis machining tool will be described with reference to Fig. 5 described.

[0040] As with the electrolysis machining tool 10 in the above-described embodiment, an electrolysis machining tool 10b in the present modification example also includes a tool electrode 11b which is tubular around the tool axis At and an inner peripheral side of which forms an electrolytic solution channel 13b, and the insulating layer 21 formed on the electrode outer peripheral surface 12 which is the outer peripheral surface of the tubular tool electrode 11b.

[0041] Like the electrolyte solution channel 13 in the above-described embodiment, the electrolyte solution channel 13b in the present modification example also includes the inlet, an outlet 13ob, the main channel portion 14, and a diameter-enlarging portion 15b. However, the position of the outlet 13ob in the present modification example differs from the position of the outlet 13o in the above-described embodiment.

[0042] The outlets 13o of the electrolyte solution channels 13, 13a in the above-described embodiment and the first modification example are formed at the ends on the radially outer side Dro of the tool electrodes 11, 11a, that is, at the ends on the first side Da1 of the tool electrodes 11, 11a. On the other hand, the outlet 13ob of the electrolyte solution channel 13b in the present modification example is formed at a position between the end on the radially outer side Dro and the end on the radially inner side Dri of the tool electrode 11b, that is, the end on the first side Da1 of the tool electrode 11b.

[0043] A first side electrode end surface 17b facing the first side Da1 is formed between the outlet 13ob of the electrolyte solution channel 13b and the electrode outer peripheral surface 12 of the tool electrode 11b, which, in the present modification example, are located on the outer surface of the tool electrode 11b. The first side electrode end surface 17b is a surface formed to gradually face the second side Da2 from the outlet 13ob of the electrolyte solution channel 13b toward the radially outer side Dro, and is a convex curved surface toward the radially outer side Dro.

[0044] As in the above-described embodiment and each of the above-described modification examples, an inner peripheral surface 16b of the tool electrode 11b, which defines the diameter-increasing portion 15b of the electrolytic solution channel 13b in the present modification example, is a curved surface in which the inner diameter gradually and smoothly approaches the radially outer side Dro toward the first side Da1. Moreover, as in the above-described embodiment and each of the above-described modification examples, the end of the diameter-increasing portion 15b on the first side Da1 in the present modification example is the end of the tool electrode 11b on the first side Da1 and is the outlet 13ob of the electrolytic solution channel 13b.

[0045] Therefore, in the present modification example, as in the above-described embodiment and each of the above-described modification examples, the retention of the plurality of bubbles B between the tool electrode 11b and the workpiece W can be suppressed, and an increase in electrical resistance between the tool electrode 11b and the workpiece W can be suppressed. [Third modification example of electrolysis machining tool]

[0046] A third modification example of the electrolysis machining tool will be described with reference to Fig. 6 described.

[0047] As with the electrolysis machining tool 10 in the above-described embodiment, an electrolysis machining tool 10c in the present modification example also includes a tool electrode 11c which is tubular around the tool axis At and an inner peripheral side of which forms an electrolytic solution channel 13c, and the insulating layer 21 formed on the electrode outer peripheral surface 12 which is the outer peripheral surface of the tubular tool electrode 11c.

[0048] Like the electrolyte solution channel 13 in the above-described embodiment, the electrolyte solution channel 13c in the present modification example also includes the inlet, the outlet 13o, the main channel portion 14, and a diameter-increasing portion 15c. However, the configuration of the diameter-increasing portion 15c in the present modification example differs from the configuration of the diameter-increasing portion 15 in the above-described embodiment.

[0049] An inner peripheral surface 16c of the tool electrode 11c, which defines the diameter-increasing portion 15c in the present modification example, includes a first inner peripheral surface 161c, a second inner peripheral surface 162c, and a third inner peripheral surface 163c. The first inner peripheral surface 161c, the second inner peripheral surface 162c, and the third inner peripheral surface 163c all have a surface shape corresponding to a part of an outer peripheral surface of a cone having the second side Da2 as a vertex and the first side Da1 as a bottom surface. The end of the first inner peripheral surface 161c on the second side Da2 is connected to the end of the main channel portion 14 on the first side Da1 at the electrolyte solution channel 13c. The end of the second inner peripheral surface 162c on the second side Da2 is connected to the end of the first inner peripheral surface 161c on the first side Da1.The end of the third inner peripheral surface 163c on the second side Da2 is connected to the end of the second inner peripheral surface 162c on the first side Da1. The end of the third inner peripheral surface 163c on the first side Da1 is the outlet 13o. For this reason, the shape of the inner peripheral surface 16c of the tool electrode 11c, which defines the diameter-increasing portion 15c in the cross section of the tool electrode 11c including the tool axis At, is a shape in which three straight lines are connected.

[0050] Here, the displacement amount on the radially outer side Dro relative to the unit displacement amount to the first side Da1 of each of the inner peripheral surfaces 161c, 162c, and 163c is referred to as a diameter enlargement rate. The diameter enlargement rate of the second inner peripheral surface 162c is greater than the diameter enlargement rate of the first inner peripheral surface 161c. Moreover, the diameter enlargement rate of the third inner peripheral surface 163c is greater than the diameter enlargement rate of the second inner peripheral surface 162c.

[0051] Therefore, like the diameter-increasing portions 15, 15a, 15b in the above-described embodiment and each of the above-described modification examples, the inner diameter of the diameter-increasing portion 15c in the present modification example also gradually increases toward the first side Da1. Moreover, like the inner peripheral surfaces 16, 16a, 16b of the tool electrodes 11, 11a, 11b defining the diameter-increasing portions 15, 15a, 15b in the above-described embodiment and each of the above-described modification examples, the entire inner peripheral surface 16c of the tool electrode 11c defining the diameter-increasing portion 15c in the present modification example is a convex surface on the side near the tool axis At.

[0052] Moreover, in a cross section of the tool electrode 11c including the tool axis At, an inner angle θ formed by the first inner peripheral surface 161c and the second inner peripheral surface 162c and an inner angle formed by the second inner peripheral surface 162c and the third inner peripheral surface 163c are both 150° or more and less than 180°.

[0053] As described above, in the inner peripheral surface 16c defining the diameter-increasing portion 15c in the present modification example, unlike the above-described embodiment and each of the above-described modification examples, the shape of the inner peripheral surface 16c defining the diameter-increasing portion 15c in the cross section of the tool electrode 11c including the tool axis Δt is a shape in which three straight lines are connected. However, like the diameter-increasing portions 15, 15a, 15b in the above-described embodiment and each of the above-described modification examples, the inner diameter of the diameter-increasing portion 15c in the present modification example gradually increases toward the first side Da1.Furthermore, the inner peripheral surface 16c defining the diameter-increasing portion 15c has a convex surface on the side near the tool axis At as a whole and has a surface shape corresponding to the shape of the inner peripheral surface of the horn. For this reason, even in the present modified example, an eddy current of the electrolytic solution is not substantially formed on the first side Da1 of the tool electrode 11c, and the plurality of bubbles B flow more smoothly than in the comparative example. Therefore, even in the present modified example, the retention of the plurality of bubbles B between the tool electrode 11c and the workpiece W can be suppressed, and an increase in electrical resistance between the tool electrode 11c and the workpiece W can be suppressed.

[0054] In a case where any one of the internal angle θ formed by the first inner peripheral surface 161c and the second inner peripheral surface 162c and the internal angle formed by the second inner peripheral surface 162c and the third inner peripheral surface 163c is less than 135°, an eddy current of the electrolytic solution is likely to be formed around the angle formed by the two inner peripheral surfaces. Therefore, it is preferable that each internal angle be 135° or more.

[0055] Furthermore, the shape of the inner peripheral surface 16c defining the diameter-increasing portion 15c in the present modification example is a surface shape obtained by combining a portion of outer peripheral surfaces of a plurality of cones having the second side Da2 as a vertex. However, the inner peripheral surface defining the diameter-increasing portion may be a surface shape of a portion of an outer peripheral surface of a cone having the second side Da2 as a vertex. [Fourth modification example of electrolysis machining tool]

[0056] A fourth modification example of the electrolysis machining tool will be described with reference to Fig. 7 described.

[0057] As with the electrolysis machining tool 10 in the above-described embodiment, an electrolysis machining tool 10d in the present modification example also includes a tool electrode 11d which is tubular around the tool axis At and of which the inner peripheral side forms an electrolytic solution channel 13d, and the insulating layer 21 formed on the electrode outer peripheral surface 12 which is the outer peripheral surface of the tubular tool electrode 11d.

[0058] Like the electrolyte solution channel 13 in the above-described embodiment, the electrolyte solution channel 13d in the present modification example also includes the inlet, the outlet 13o, the main channel portion 14, and a diameter-increasing portion 15d. However, the configuration of the diameter-increasing portion 15d in the present modification example differs from the configuration of the diameter-increasing portion 15 in the above-described embodiment.

[0059] An inner peripheral surface 16d of the tool electrode 11d, which defines the diameter-increasing portion 15d in the present modification example, includes a first inner peripheral surface 161d, a second inner peripheral surface 162d, a third inner peripheral surface 163d, and a fourth inner peripheral surface 164d. The first inner peripheral surface 161d, the second inner peripheral surface 162d, the third inner peripheral surface 163d, and the fourth inner peripheral surface 164d all have a surface shape corresponding to a part of an outer peripheral surface of a cone having the second side Da2 as a vertex and the first side Da1 as a bottom surface. The end of the first inner peripheral surface 161d on the second side Da2 is connected to the end of the main channel portion 14 on the first side Da1 in the electrolyte solution channel 13d.The end of the second outer peripheral surface on the second side Da2 is connected to the end of the first inner peripheral surface 161d on the first side Da1. The end of the third outer peripheral surface on the second side Da2 is connected to the end of the second inner peripheral surface 162d on the first side Da1. The end of the fourth inner peripheral surface 164d on the second side Da2 is connected to the end of the third inner peripheral surface 163d on the first side Da1. The end of the fourth inner peripheral surface 164d on the first side Da1 is the outlet 13o. For this reason, the shape of the inner peripheral surface 16d defining the diameter increasing portion 15d in the cross section of the tool electrode 11d including the tool axis Δt is a shape in which four straight lines are connected.

[0060] The diameter increase rate of the second inner peripheral surface 162d is greater than the diameter increase rate of the first inner peripheral surface 161d. Furthermore, the diameter increase rate of the third inner peripheral surface 163d is smaller than the diameter increase rate of the second inner peripheral surface 162d. The diameter increase rate of the fourth inner peripheral surface 164d is greater than the diameter increase rate of the third inner peripheral surface 163d.

[0061] As described above, like the diameter-increasing portions 15, 15a, 15b, 15c in the above-described embodiment and each of the above-described modification examples, the inner diameter of the diameter-increasing portion 15d in the present modification example also gradually increases toward the first side Da1. Moreover, in the cross section of the tool electrode 11d including the tool axis At, an inner angle formed by the first inner peripheral surface 161d and the second inner peripheral surface 162d, an inner angle θd formed by the second inner peripheral surface 162d and the third inner peripheral surface 163d, and an inner angle formed by the third inner peripheral surface 163d and the fourth inner peripheral surface 164d are all 135° or more.

[0062] For this reason, in the present modification example, as well as in the third modification example, the eddy current of the electrolytic solution is not formed so much on the first side Da1 of the tool electrode 11d, and the plurality of bubbles B flow more smoothly than in the comparative example.

[0063] Therefore, also in the present modification example, the retention of the plurality of bubbles B between the tool electrode 11d and the workpiece W can be suppressed, and an increase in electrical resistance between the tool electrode 11d and the workpiece W can be suppressed.

[0064] However, in the present modification example, the diameter increase rate of the third inner peripheral surface 163d is smaller than the diameter increase rate of the second inner peripheral surface 162d, and the diameter increase rate of the fourth inner peripheral surface 164d is larger than the diameter increase rate of the third inner peripheral surface 163d. In other words, an inner angle θd formed by the second inner peripheral surface 162d and the third inner peripheral surface 163d is larger than 180°. Therefore, a part of the inner peripheral surface 16d of the tool electrode 11d, which defines the diameter increasing portion 15d in the present modification example, is formed in a concave shape on a side away from the tool axis Δt.For this reason, in the present modification example, compared with the third modification example, an eddy current of the electrolytic solution is more likely to be formed on the first side Da1 of the tool electrode 11d, and a plurality of bubbles B are more likely to remain between the tool electrode 11d and the workpiece W. Therefore, as in the above-described embodiment and each of the modification examples, it is preferable that the entire inner peripheral surface of the tool electrode defining the diameter increasing portion is a convex surface on the side near the tool axis At.

[0065] In the present modification example, the shape of the inner peripheral surface 16d defining the diameter-increasing portion 15d in the cross section of the tool electrode 11d including the tool axis At is a shape in which a plurality of straight lines are connected. However, even if the shape of the inner peripheral surface defining the diameter-increasing portion in the cross section of the tool electrode including the tool axis At is defined by a curved line, it is preferable that the entire inner peripheral surface defining the diameter-increasing portion be a convex surface on the side near the tool axis At. [Fifth modification example of electrolysis machining tool]

[0066] A fifth modification example of the electrolysis machining tool will be described with reference to Fig. 8 described.

[0067] Like the electrolytic machining tool 10 in the above-described embodiment, an electrolytic machining tool 10e in the present modification example also includes the tool electrode 11, which is tubular around the tool axis Δt, and whose inner peripheral side forms the electrolytic solution channel 13, and an insulating layer 21e formed on the electrode outer peripheral surface 12, which is the outer peripheral surface of the tubular tool electrode 11. However, the configuration of the insulating layer 21e in the present modification example is different from the configuration of the insulating layer 21 in the above-described embodiment.

[0068] Like the insulating layer 21 in the above-described embodiment and each of the above-described modification examples, the insulating layer 21e in the present modification example also includes the insulating layer inner peripheral surface 22, the insulating layer outer peripheral surface 23, and a first side insulating layer end surface 24e. Like the first side insulating layer end surface 24 in the above-described embodiment and each of the above-described modification examples, the first side insulating layer end surface 24e in the present modification example also gradually extends toward the second side Da2 when the first side insulating layer end surface 24e faces the radially outer side Dro.However, the shape of the first side insulating layer end surface 24e in the cross section of the insulating layer 21e including the tool axis Δt is a curved surface convex toward the radially outer side Dro, which is different from the first side insulating layer end surface 24 in the above-described embodiment and each of the above-described modification examples. Therefore, in the present modification example, no angle is formed in a connecting portion between the end (outlet 13o) on the radially outer side Dro of the surface of the tool electrode 11 and the end on the radially inner side Dri of the first side insulating layer end surface 24e, and in a connecting portion between the end on the radially outer side Dro of the first side insulating layer end surface 24e and the end on the first side Da1 of the insulating layer outer peripheral surface 23.

[0069] In the present modification example, the electrolytic solution flows smoothly from the position along the surface of the tool electrode 11 to the position along the first side insulating layer end surface 24e. Moreover, the electrolytic solution flows smoothly from the position along the first side insulating layer end surface 24e to the position along the insulating layer outer peripheral surface 23. For this reason, in the present modification example, compared to the above-described embodiment and each of the above-described modification examples, it is possible to suppress the retention of the plurality of bubbles B between the tool electrode 11 and the workpiece W and to suppress an increase in electrical resistance between the tool electrode 11 and the workpiece W.

[0070] The present modification example is a modification example of the above-described embodiment. However, the insulating layer 21 in each of the above-described modification examples may also have the same shape as in the present modification example. [Embodiment of blade manufacturing method]

[0071] An embodiment of a blade manufacturing method is described with reference to Fig. 9 to 13 described.

[0072] A blade manufactured in the present embodiment is a blade of a gas turbine. As shown in Fig. 12, a blade 50 includes a blade body 51 whose cross section has a blade shape and which extends in a blade height direction Dh perpendicular to the cross section. The blade body 51 includes an outer surface 52, a blade channel 53, and a plurality of cooling channels 54. The blade channel 53 is formed within the outer surface 52 of the blade body 51. The plurality of cooling channels 54 penetrate the outer surface 52 of the blade channel 53. In some cases, the blade 50 further includes a heat shielding layer 56. The heat shielding layer 56 is formed on the outer surface 52 of the blade body 51.

[0073] The blade 50 of the gas turbine is exposed to a high-temperature combustion gas. Therefore, cooling air is introduced into the blade passage 53, and the cooling air is expelled out of the blade 50 through the plurality of cooling passages 54. The blade 50 is cooled by convection by cooling air flowing through the blade passage 53 and the plurality of cooling passages 54.

[0074] As shown in the flowchart of Fig. 9, the blade 50 is manufactured through an intermediate product receiving step S1, a cooling channel forming step S2, and a finishing step S3.

[0075] In the intermediate product receiving step S1, a blade intermediate product 55 in which the outer surface 52 of the target shape is formed is received. The blade intermediate product 55 is cast, for example, using a mold. As shown in Fig. As shown in Figure 10, the blade intermediate 55 includes the outer surface 52 and the blade passage 53, but does not include the cooling passage 54. In the intermediate receiving step S1, an external party may form the blade intermediate 55, and a final blade manufacturer may receive the blade intermediate 55 from the external party. Alternatively, the final blade manufacturer may form the blade intermediate 55, and the final blade manufacturer may receive the blade intermediate 55.

[0076] In the cooling channel forming step S2, the cooling channel 54 is formed in the blade intermediate product 55 as shown in Fig. 11, by using the electrolytic machining apparatus described above. In this case, in order to efficiently discharge bubbles generated in the electrolytic machining step, the orientation of the blade intermediate 55 is adjusted so that an extension direction of the cooling channel 54 to be formed is a direction with a vertical component. Then, the electrolytic machining tool 10 of the electrolytic machining apparatus is moved vertically downward with respect to the blade intermediate 55 to form the cooling channel 54.

[0077] In the finishing step S3, the surface of the blade intermediate product 55 in which the cooling channels 54 are formed is polished, and in some cases, as in Fig. 12, a heat shield layer 56 is formed on the surface of the blade intermediate product 55 in which the cooling channels 54 are formed to perform finishing on the blade 50.

[0078] In the present embodiment, the cooling channel 54 is formed in the blade intermediate product 55 by using the electrolytic machining apparatus described above. Therefore, the machining efficiency of the cooling channel 54 is improved, and the manufacturing cost of the blade 50 can be reduced.

[0079] The blade body 51 of the blade 50 has the outer surface 52, the blade channel 53 and the plurality of cooling channels 54. As shown in Fig. However, as shown in FIG. 13, a blade body 51a of a blade 50a may have the outer surface 52 and the plurality of cooling channels 54, and may not have the blade channel 53. In this case, a blade intermediate 55a received in the intermediate receiving step S1 has the outer surface 52 but does not have the blade channel 53. Moreover, in this case, cooling air is introduced into the plurality of cooling channels 54, and the cooling air is discharged from the plurality of cooling channels 54 to the outside of the blade 50a.

[0080] At the Fig. 12, the plurality of cooling channels 54 are provided over all sections along the outer surface 52 of the blade body 51. In addition, in the blade shown in Fig.In the blade 50a shown in Figure 13, the plurality of cooling channels 54 are provided over the entire blade body 51a. However, only a portion of the blade, for example, only a portion on one side in the blade height direction, may be provided with the plurality of cooling channels.

[0081] The present disclosure is not limited to the embodiments and each of the modification examples described above. Various additions, modifications, replacements, partial deletions, and the like may be made without departing from the conceptual idea and gist of the present invention, which are derived from the contents defined in the claims and their equivalents. [Additional Notes]

[0082] The electrolysis machining tools 10, 10a, 10b, 10c, 10d, 10e in the above-described embodiments and modification examples are understood, for example, as follows.

[0083] (1) An electrolysis machining tool according to a first aspect comprises: the tool electrodes 11, 11a, 11b, 11c, 11d, which are tubular around the tool axis At and of which the inner peripheral side forms the electrolyte solution channels 13, 13a, 13b, 13c, 13d; and the insulating layers 21, 21e formed on the electrode outer peripheral surface 12, which is the outer peripheral surface of the tubular tool electrodes 11, 11a, 11b, 11c, 11d. The electrolyte solution channels 13, 13a, 13b, 13c, 13d include the outlets 13o, 13ob formed at the end on the first side Da1 among the first side Da1 and the second side Da2 in the axial direction Da in which the tool axis At extends at the tool electrodes 11, 11a, 11b, 11c, 11d, and the diameter-increasing portions 15, 15a, 15b, 15c, 15d whose inner diameter gradually increases toward the first side Da1. The ends on the first side Da1 of the diameter-increasing portions 15, 15a, 15b, 15c, 15d are the outlets 13o, 13ob.

[0084] During electrolytic machining, the hydrogen ions or water contained in the electrolytic solution receive electrons from the tool electrodes 11, 11a, 11b, 11c, 11d used as the cathode to form hydrogen bubbles B. The electrolytic solution channels 13, 13a, 13b, 13c, 13d according to the present aspect have the diameter-increasing portions 15, 15a, 15b, 15c, 15d in which the inner diameters gradually increase toward the first side Da1, and the ends of the first side Da1 in the diameter-increasing portions 15, 15a, 15b, 15c, 15d are outlets 13o, 13ob of the electrolytic solution channels 13, 13a, 13b, 13c, 13d.For this reason, in the present aspect, it is difficult for the eddy current V of the electrolytic solution to be formed on the first side Da1 of the tool electrodes 11, 11a, 11b, 11c, 11d and the plurality of bubbles B flow smoothly, and thus it is possible to suppress the retention of the plurality of bubbles B between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W. Therefore, in the present aspect, it is possible to suppress an increase in electrical resistance between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W, and when the voltage applied between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W is increased, the value of the current flowing between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W also increases with an increase in the voltage, and thus the machining efficiency of the workpiece W can be improved.

[0085] (2) In an electrolytic machining tool according to a second aspect, In the electrolysis machining tools 10, 10a, 10b, 10e according to the first aspect, the inner peripheral surfaces 16, 16a, 16b of the tool electrodes 11, 11a, 11b, which define the diameter-enlarging portions 15, 15a, 15b of the electrolyte solution channels 13, 13a, 13b, are uniformly continuously curved surfaces.

[0086] In the present aspect, the electrolytic solution and the bubbles B flow smoothly along the inner peripheral surfaces 16, 16a, 16b of the tool electrodes 11, 11a, 11b defining the diameter increasing portions 15, 15a, 15b of the electrolytic solution channels 13, 13a, 13b, and it is possible to suppress the retention of the plurality of bubbles B between the tool electrodes 11, 11a, 11b and the workpiece W.

[0087] (3) In an electrolytic machining tool according to a third aspect, In the electrolysis machining tool 10c according to the first aspect, a shape of the inner peripheral surface 16c of the tool electrode 11c defining the diameter increasing portion 15c of the electrolytic solution channel 13c is a surface shape of a part of an inner peripheral surface of a cone having the second side Da2 as a vertex, or a surface shape obtained by combining a part of outer peripheral surfaces of the plurality of cones having the second side Da2 as a vertex.

[0088] (4) In an electrolysis machining tool according to a fourth aspect, in the electrolysis machining tools 10, 10a, 10b, 10c, 10e according to any one of the first to third aspects, the inner peripheral surfaces 16, 16a, 16b, 16c of the tool electrodes 11, 11a, 11b, 11c defining the diameter increasing portions 15, 15a, 15b, 15c of the electrolytic solution channels 13, 13a, 13b, 13c have shapes corresponding to inner peripheral surfaces of horns.

[0089] In the present aspect, the electrolytic solution and the bubbles B flow smoothly along the inner peripheral surfaces 16, 16a, 16b, 16c defining the diameter increasing portions 15, 15a, 15b, 15c of the electrolytic solution channels 13, 13a, 13b, 13c, and it is possible to suppress the retention of the plurality of bubbles B between the tool electrodes 11, 11a, 11b, 11c and the workpiece W.

[0090] (5) In an electrolytic machining tool according to a fifth aspect, In the electrolytic machining tools 10, 10a, 10b, 10c, 10e according to any one of the first to fourth aspects, the entire inner peripheral surfaces 16, 16a, 16b, 16c of the tool electrodes 11, 11a, 11b, 11c, 11d defining the diameter-increasing portions 15, 15a, 15b, 15c are convex on a side near the tool axis At.

[0091] In the present aspect, the retention of the bubbles B can be suppressed compared to a case where a part of the inner peripheral surface of the tool electrode defining the diameter increasing portion is formed in a concave shape on a side away from the tool axis At.

[0092] (6) In an electrolytic machining tool according to a sixth aspect, In the electrolytic machining tools 10, 10a, 10b, 10c, 10d, 10e according to any one of the first to fifth aspects, the insulating layers 21, 21e include the insulating layer outer peripheral surface 23, which is an outer peripheral surface of the insulating layers 21, 21e, and the first side insulating layer end surfaces 24, 24e, which extend toward the radially outer side Dro with respect to the tool axis At from the end on the first side Da1 of the electrode outer peripheral surface 12 to the end on the first side Da1 of the insulating layer outer peripheral surface 23. The first side insulating layer end surfaces 24, 24e gradually extend toward the second side Da2 as the first side insulating layer end surfaces 24, 24e face the radially outer side Dro.

[0093] According to the present aspect, since the first side insulating layer end surfaces 24, 24e gradually extend toward the second side Da2 when the first side insulating layer end surfaces 24, 24e are directed toward the radially outer side Dro, the bubbles B in the electrolytic solution flowing along the surfaces of the tool electrodes 11, 11a, 11b, 11c, 11d are likely to flow toward the insulating layer outer peripheral surface 23 side. Therefore, in the present aspect, also from this point of view, the plurality of bubbles B flow smoothly, and it is possible to suppress the retention of the plurality of bubbles B between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W.

[0094] The electrolysis machining apparatus in the above-described embodiment is understood, for example, as follows.

[0095] (7) An electrolytic machining apparatus according to a seventh aspect comprises: the electrolysis machining tools 10, 10a, 10b, 10c, 10d, 10e according to any one of the first to sixth aspects; a power supply circuit 1 configured to apply a voltage between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W such that the tool electrodes 11, 11a, 11b, 11c, 11d of the electrolysis machining tools 10, 10a, 10b, 10c, 10d, 10e are negative electrodes and the workpiece W to be machined by the electrolysis machining tools 10, 10a, 10b, 10c, 10d, 10e is a positive electrode; a moving mechanism 2 configured to move the electrolytic processing tools 10, 10a, 10b, 10c, 10d, 10e relative to the workpiece W; an electrolytic solution supply machine 3 configured to supply an electrolytic solution to the electrolytic solution channels 13, 13a, 13b, 13c, 13d;and a controller 4 configured to control the power supply circuit 1, the moving mechanism 2, and the electrolyte solution supply machine 3;

[0096] The electrolytic machining apparatus according to the present aspect includes the electrolytic machining tools 10, 10a, 10b, 10c, 10d, 10e in any one of the first to fifth aspects described above. Therefore, it is possible to suppress the retention of the plurality of bubbles B between the tool electrodes 11, 11a, 11b, 11c, 11d and the workpiece W, and it is possible to improve the machining efficiency of the workpiece W.

[0097] The blade manufacturing method in the above-described embodiment is understood, for example, as follows.

[0098] (8) A blade manufacturing method according to an eighth aspect comprises: the intermediate product receiving step S1 of receiving the blade intermediate product 55, in which the outer surface 52 of the target shape is formed; and the cooling channel forming step S2 of forming the cooling channel 54 within the blade intermediate product 55. In the cooling channel forming step S2, the cooling channel 54 is formed in the blade intermediate product 55 by using the electrolytic machining apparatus according to the seventh aspect.

[0099] In the blade manufacturing method according to the present aspect, the cooling channel 54 is formed in the blade intermediate product 55 by using the electrolytic machining apparatus according to the seventh aspect. Therefore, the machining efficiency of the blade intermediate product 55 is improved, and the manufacturing cost of the blade 50 can be reduced. Industrial applicability

[0100] According to one aspect of the present disclosure, it is possible to improve the machining efficiency of a workpiece. List of reference symbols 1 power supply circuit 2 Movement mechanism 3 Electrolyte solution supply machine 3a Tank 3b Electrolyte solution line 3c pump 4 Control 10, 10a, 10b, 10c, 10d, 10e, 10x electrolysis machining tool 11, 11a, 11b, 11c, 11d, 11x tool electrode 12, 12x electrode outer peripheral surface 13, 13a, 13b, 13c, 13d, 13x Electrolyte solution channel 13i Inlet 13o, 13ob, 13ox outlet 14 Main canal section 15, 15a, 15b, 15c, 15d Diameter-enlarging section 16, 16a, 16b, 16c, 16d, 16x inner peripheral surface 161c, 161d first inner peripheral surface 162c, 162d second inner peripheral surface 163c, 163d third inner peripheral surface 164d fourth inner circumferential surface 17b, 17x first side electrode end face 21, 21e, 21x insulation layer 22, 22x insulating layer inner peripheral surface 23, 23x insulation layer outer peripheral surface 24, 24e, 24x first side insulation layer end face 50, 50a shovel 51, 51a blade body 52 exterior area 53 blade channel 54 Cooling channel 55, 55a Blade intermediate product 56 Heat shielding layer At tool axis Since axial direction Da1 first page Da2 second page Dr radial direction Dri radial inside Dro radial outside B Bladder V Eddy current W workpiece QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2022-211124

[0002] JP 6071742

[0006]

Claims

[1] Electrolysis machining tool, comprising: a tool electrode which is tubular around a tool axis and of which an inner peripheral side forms an electrolyte solution channel; and an insulating layer formed on an electrode outer peripheral surface, which is an outer peripheral surface of the tubular tool electrode, where the electrolyte solution channel contains: an outlet formed at one end on a first side below the first side and a second side in an axial direction in which the tool axis extends in the tool electrode, and a diameter-increasing portion in which an inner diameter gradually increases toward the first side, and one end on the first side of the diameter increasing section is the outlet. [2] The electrolytic machining tool according to claim 1, wherein an inner peripheral surface of the tool electrode defining the diameter increasing portion of the electrolytic solution channel is a smoothly continuously curved surface. [3] The electrolytic machining tool according to claim 1, wherein an inner peripheral surface of the tool electrode defining the diameter-increasing portion of the electrolytic solution channel is a surface of a part of an inner peripheral surface of a cone having the second side as an apex, or a surface obtained by combining a part of outer peripheral surfaces of a plurality of cones having the second side as an apex. [4] The electrolytic machining tool according to claim 1, wherein an inner peripheral surface of the tool electrode defining the diameter increasing portion of the electrolytic solution channel has a shape corresponding to an inner peripheral surface of a horn. [5] The electrolytic machining tool according to claim 1, wherein an entire inner peripheral surface of the tool electrode defining the diameter increasing portion is convex on a side near the tool axis. [6] Electrolysis machining tool according to claim 1, wherein the insulating layer includes an insulating layer outer peripheral surface, which is an outer peripheral surface of the insulating layer, and a first side insulating layer end surface, which extends from an end on the first side of the electrode outer peripheral surface to an end on the first side of the insulating layer outer peripheral surface to a radially outer side with respect to the tool axis, and the first side insulating layer end face extends gradually toward the second side when the first side insulating layer end face is directed toward the radially outer side. [7] Electrolytic machining apparatus comprising: the electrolysis machining tool according to one of claims 1 to 6; a power supply circuit configured to apply a voltage between the tool electrode and a workpiece such that the tool electrode of the electrolysis machining tool is a negative electrode and the workpiece to be machined by the electrolysis machining tool is a positive electrode; a moving mechanism configured to relatively move the electrolysis machining tool with respect to the workpiece; an electrolyte solution supply machine configured to supply an electrolyte solution to the electrolyte solution channel; and a controller configured to control the power supply circuit, the movement mechanism, and the electrolyte solution supply machine. [8] Blade manufacturing process, executing: an intermediate product receiving step of receiving a blade intermediate product in which an outer surface of a target shape is formed; and a cooling channel forming step of forming a cooling channel within the blade intermediate product, wherein in the cooling channel forming step, the cooling channel is formed in the blade intermediate product by using the electrolytic machining apparatus according to claim 7.

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