CN111715954A

CN111715954A - Electrochemical machining device for closed type wheel blade and forming method of electrode body of electrochemical machining device

Info

Publication number: CN111715954A
Application number: CN201910435505.3A
Authority: CN
Inventors: 范智文; 张振晖; 陈佑论; 林大裕; 林秋丰
Original assignee: Metal Industries Research and Development Centre
Current assignee: Metal Industries Research and Development Centre
Priority date: 2019-03-20
Filing date: 2019-05-23
Publication date: 2020-09-29
Anticipated expiration: 2039-05-23
Also published as: TW202035042A; TWI720442B; CN111715954B

Abstract

The invention relates to an electrochemical machining device for a closed type vane and a forming method of an electrode body of the electrochemical machining device. The electrode body has one end face and several flow channels, one end of the electrode body has one cavity communicated with the flow channels, and the cavity has cross section area greater than that of each of the flow channels.

Description

Electrochemical machining device for closed type wheel blade and forming method of electrode body of electrochemical machining device

Technical Field

The present invention relates to a processing apparatus and a method thereof, and more particularly, to an electrochemical processing apparatus for processing a profile of a wheel blade by electrochemical processing and a method of forming an electrode body thereof.

Background

The impeller is widely applied to engines of space appliances or hydraulic power generation machines and tools, and the processing and manufacturing technology of the impeller directly influences the working performance and reliability of a machine set. In order to adapt to a more severe working environment, the closed impeller made of a special material is more and more widely applied. The integral closed structure and special materials (such as high-temperature alloy, titanium alloy and the like) make the processing and manufacturing difficult. At present, numerical control milling and precision casting are widely applied to the processing of impellers.

However, when a small-flow-channel impeller made of a material difficult to machine is machined, numerical control milling is difficult to apply due to the limitations of tool rigidity and space. The precision forging and casting can save materials and reduce the amount of cutting, but the impeller made of high-performance metal materials such as titanium alloy, high-temperature high-strength alloy and the like is difficult all the time.

Disclosure of Invention

An object of the present invention is to provide an electrochemical machining apparatus for a closed type blade and a method for forming an electrode body thereof, which provides a multi-channel design for applying electrochemical machining of the closed type blade.

The invention discloses an electrochemical machining device for a closed type wheel blade, which comprises an electrode body. The electrode body is internally provided with a plurality of flow channels, an outer wall, a plurality of flow channels, a cavity, a first end face, a first cross section and a second cross section, wherein the outer wall surrounds the flow channels, the first cross section and the second cross section are connected with the cavity, the flow channels extend to the end face, the sectional area of the cavity is larger than that of each flow channel, and the first cross section is different from the second cross section. The electrode body is used for carrying out electrochemical machining on the closed type wheel blade of the single channel and is used for machining a complex-shaped flow channel of the closed type wheel blade.

The invention discloses a forming method of an electrode body, which comprises the steps of extracting a first model corresponding to a closed type wheel blade with a single flow channel cavity; cutting a plurality of cross sections by the first model, taking the center position according to the cross sections to form a processing path, and forming a first profile according to the processing path and the cross sections; then, uniformly retracting an interval according to the edge of the first profile to form a processing profile; forming a first edge on a first side of the processing surface, and forming a second edge on a second side of the processing surface, wherein the first edge is the same as the processing path trace, and the second edge fits a corresponding edge of the first model; and finally, passing through the single-channel cavity according to the machining path, and cutting the joint of the second model and the single-channel cavity to form an electrode body.

Drawings

FIG. 1: which is a perspective view of an embodiment of the electrochemical machining apparatus for a closed vane of the present invention;

FIG. 2: another perspective view of an embodiment of the electrochemical machining apparatus for a closed vane of the present invention;

FIG. 3A: which is a cross-sectional view of an embodiment of an electrochemical machining apparatus for a closed vane of the present invention;

FIG. 3B: which is a front view of an embodiment of the electrochemical machining apparatus for a closed vane of the present invention;

FIG. 3C: which is a cross-sectional view of a first cross-section of the electrochemical machining apparatus for a closed vane of the present invention;

FIG. 3D: which is a cross-sectional view of a second cross-section of the electrochemical machining apparatus for a closed vane of the present invention;

FIG. 4: which is a flowchart of an embodiment of the molding method of an electrode body of the present invention;

FIG. 5: the invention is a cross-sectional schematic view of the closed type wheel blade and the flow channel thereof;

FIG. 6: which is a schematic cross-sectional view of an equally sectioned first model of the present invention;

FIG. 7: the star-shaped connection with the equal cross section forms a schematic processing path;

FIG. 8: it is a schematic view of the intersection plane of the cross section of the present invention superimposed along the processing path; and

FIG. 9: which is a schematic diagram of the shape of the processing electrode of the present invention.

[ brief description of the drawings ]

1 electrochemical machining apparatus

10 grip part

12 space for accommodating

14 opening

16 first through hole

18 second communication hole

20 electrode body

20A outer wall

21 end face

30 flow passage

32 first flow channel

32A first end portion

32B second end

34 second flow path

34A third end part

34B fourth end

40 chamber

42 bottom surface

45 insulating layer

50 closed type vane

60 first model

Section 61

62 first profile

63 processing shaped surface

65 first edge

66 second edge

70 machining path

80 second model

A first cross section

B second section

Detailed Description

In order to provide a further understanding and appreciation for the structural features and advantages achieved by the present invention, the following detailed description of the presently preferred embodiments is provided:

the invention relates to a processing device of a closed wheel blade and a forming method of an electrode body thereof.

Fig. 1 to fig. 3D are a perspective view, another perspective view and a cross-sectional view of an embodiment of a machining electrode for a closed blade according to the present invention. As shown in fig. 1 to third drawings, the apparatus 1 for processing a closed blade includes: a holding part 10 and an electrode body 20 connected to the holding part 10, wherein a plurality of flow channels 30 and a cavity 40 are disposed in the electrode body 20, an outer wall 20A of the electrode body 20 surrounds the flow channels 30 and the cavity 40, one side of the electrode body 20 has a processing end face 21, the flow channels 30 are communicated with the end face 21 and the cavity 40, and a sectional area of the cavity 40 is larger than a sectional area of each flow channel 30.

As shown in fig. 3A, an accommodating space 12 is disposed inside the holding portion 10, an opening 14 is disposed on one side of the holding portion 10, the accommodating space 12 is communicated with the flow channels 30 through a first communication hole 16 and a second communication hole 18, and a cross-sectional area of the accommodating space 12 is larger than a cross-sectional area of each flow channel 30. In one embodiment, electrode body 20 includes an outer wall 20A. In one embodiment, the surface topography of the electrode body 20 is rod-shaped. In another embodiment, the surface topography of the electrode body 20 is flat. As shown in fig. 3B to 3D, the cross section of the electrode body 20 is a non-uniform cross section, that is, the electrode body 20 has a non-uniform cross-sectional structure. The cross section of the electrode body 20 here means an area or a shape surrounded by an outer wall 20A of one cross section of the electrode body 20. The unequal cross-sections mean that the electrode bodies 20 have different areas or shapes from each other at different cross-sections, as shown in fig. 3C and 3D, the first cross-section a and the second cross-section B of the electrode body 20 have different cross-sectional areas, and the outer wall 20A surrounds each flow channel 30, the cross-sections a and B. In addition, an insulating layer 45 is disposed on the surface of the electrode body 20, and further, the insulating layer 45 may be disposed on the surfaces of the holding portion 10 and the electrode body 20. In one embodiment, the distance between the end face 21 of the electrode body 20 and the bottom face 42 of the cavity 40 is 2-7 mm.

As shown in fig. 3A, the flow channels 30 include a plurality of first flow channels 32 and a plurality of second flow channels 34. In the present embodiment, two first flow channels 32 and four second flow channels 34 are taken as an example, that is, the number of the first flow channels 32 is not equal to that of the second flow channels 34, wherein the first flow channels 32 respectively have a first end portion 32A and a second end portion 32B, and the second flow channels 34 respectively have a third end portion 34A and a fourth end portion 34B; the first flow channels 32 are disposed in the electrode body 20, and a first end portion 32A of the first flow channel 32 is communicated with the accommodating space 12 of the holding portion 10. In the present embodiment, the first end 32A of the first flow channel 32 communicates with the accommodating space 12 through the first communication hole 16 and the second communication hole 18, respectively, so that when the accommodating space 12 accommodates the electrolyte, the electrolyte passes through the first flow channel 32 through the first communication hole 16 and the second communication hole 18. The holding portion 10 may be used as a connecting member between the electrode body 20 and other components (not shown) of the electrochemical machining apparatus, in addition to the holding space 12 for holding the electrolyte.

In succession, the second channels 34 are also disposed in the electrode body 20, wherein the third ends 34A of the second channels 34 are connected to the second ends 32B of the first channels 32, and the second ends 34B of the second channels 34 are connected to the cavity 40, that is, the first channels 32 are connected to the cavity 40 through the second channels 34, and the cavity 40 buffers the hydraulic pressure generated when the electrolyte flows through the second channels 34. Therefore, in one embodiment, the electrolyte can flow out in a uniform pressure due to the design of the cavity 40.

Referring to fig. 4, a method for forming an electrode body according to the present invention includes the steps of:

step S1: correspondingly extracting a first model according to a single-channel cavity of a closed type wheel blade;

step S3: cutting a plurality of cross sections of the first model, and connecting a plurality of central positions of the cross sections to form a processing path;

step S5: according to the cross sections and the processing path, removing the non-intersection areas of the cross sections to establish a first profile;

step S7: uniformly retracting an interval according to the edge of the first profile to form a processing profile;

step S9: forming a first edge on a first side of the processing surface and a second edge on a second side of the processing surface;

step S11: forming a second model according to the processing surface, the first edge and the second edge; and

step S13: and according to the second model, entering the first model along the processing path, and cutting the region of the second model extending out of the first model to obtain an electrode body.

In step S1, as shown in fig. 5, the single flow channel cavity of the enclosed vane 50 is extracted to form a first model 60;

in step S3, as shown in fig. 5, 6 and 7, the first mold 60 is cut equally into a plurality of cross sections 61, and the cross sections 61 are connected in a star shape to form a processing path 70.

In step S5, as shown in fig. 5, 7 and 8, the intersection of the overlapped cross sections 61 of the first models 60 along the processing path 70 is cut to form the first shape 62, that is, the overlapped intersection of each cross section 61 is retained and the rest of the area is removed, so as to form the first shape 62;

in step S7, as shown in fig. 8 and 9, the first shape 62 formed in step S5 is uniformly recessed by a distance to form a machined shape 63; in step S9, a first edge 65 is formed on a first side D1 of the processing surface 63, and a second edge 66 is formed on a second side D2 of the processing surface 63, wherein the first edge 65 is formed by duplicating the processing path trace 70 or corresponding to a first corresponding edge 60A of the first model 60, the second edge 66 is formed by mirroring the second corresponding edge 60B of the first model 60 with the second side D2, that is, the second edge 66 is formed by mirroring the second corresponding edge 60B of the first model 60 with the second edge 60B of the first model 60, and further, the second corresponding edge 66 is formed by mirroring the second corresponding edge 60B of the first model 60.

In step S11, as shown in fig. 1 and 9, a second mold 80 is formed according to the processing surface 63, the first edge 65 and the second edge 66; in step S13, the second mold 80 enters the first mold 60 along the processing path 70, and the area where the second mold 80 extends out of the first mold 60 after entering the first mold 60 is cut, that is, the intersection area of the second mold 80 and the first mold 60 is cut to form the outer shape of the electrode body 20.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. An electrochemical machining apparatus for a closed vane, comprising:

an electrode body, this electrode body contains an outer wall, a plurality of runner, a cavity, a first terminal surface, a first cross-section and a second cross-section, these runners are surrounded to this outer wall, this first cross-section and this second cross-section, this cavity connects these runners and extends to this terminal surface, wherein, the sectional area of this cavity is greater than the sectional area of every runner, and wherein, this first cross-section is different from this second cross-section.

2. The enclosed vane electrochemical machining apparatus of claim 1, further comprising a grip portion.

3. The enclosed type electrochemical machining apparatus for the vane of claim 2, wherein the holding portion has a receiving space, and the flow passages are connected to the receiving space.

4. The enclosed vane electrochemical machining apparatus of claim 3, wherein the plurality of flow channels comprise:

a plurality of first flow channels, which are positioned in the electrode body and are respectively provided with a first end part and a second end part, wherein the first end parts of the first flow channels are respectively connected with the accommodating space; and

and the second flow channels are positioned in the electrode body and are respectively provided with a third end part and a fourth end part, the second flow channels are respectively connected with the second end parts through the third end part, and the second flow channels are respectively connected with the cavity through the fourth end part.

5. The enclosed vane electrochemical machining apparatus according to claim 1, wherein the electrode body has a non-uniform cross-sectional structure.

6. The electrochemical machining apparatus for a closed vane according to claim 1, further comprising an insulating layer provided on an outer surface of the electrode body or outer surfaces of both the grip portion and the electrode body.

7. A method for molding an electrode body, characterized by comprising the steps of:

correspondingly extracting a first model according to a single-channel cavity of a closed type wheel blade;

cutting a plurality of cross sections of the first model, and connecting a plurality of central positions of the cross sections to form a processing path;

according to the cross sections and the processing path, removing the non-intersection areas of the cross sections to establish a first profile;

uniformly retracting an interval according to the edge of the first profile to form a processing profile;

forming a first edge on a first side of the machined surface and a second edge on a second side of the machined surface, the first edge corresponding to a first corresponding edge of the first model, the second edge mirror image corresponding to a second corresponding edge of the first model;

the processing surface forms a second model according to the first edge and the second edge; and

and according to the second model, entering the first model along the processing path, and cutting down the region of the second model extending out of the first model to obtain an electrode body.

8. The method for forming an electrode body according to claim 7, wherein in the step of removing the non-intersection regions of the cross sections according to the cross sections and the processing path, the cross sections are overlapped, the overlapped intersection regions of the cross sections are retained, and the non-overlapped intersection regions are removed.

9. The method according to claim 7, wherein in the step of reducing the area of the second mold extending out of the first mold, the second mold is reduced to interfere with the area of the first mold, so as to form the outer shape of the electrode body without interfering with the first mold.