Processing method for multiple holes of heat shield

Abstract

The invention discloses a machining method for multiple holes of a heat shield. The machining method comprises the following steps that a heat shield part is divided into a plurality of parts to be machined in the circumferential direction; according to the axial direction of the to-be-machined hole body at the to-be-machined part, the to-be-machined part is divided into a plurality of to-be-machined areas; tool electrodes matched with a plurality of to-be-machined hole bodies in the to-be-machined area are manufactured; and the tool electrode is used for conducting electric spark forming machining on the multiple to-be-machined hole bodies in the to-be-machined area. According to the machining device, each tool electrode can machine a plurality of to-be-machined hole bodies of one to-be-machined area every time, the plurality of tool electrodes can machine all to-be-machined hole bodies of the plurality of to-be-machined areas, so that all to-be-machined hole bodies of all to-be-machined parts can be conveniently machined, multiple holes are machined in the heat insulation screen, and the machining efficiency is improved. The processing efficiency of multiple holes of the heat shield can be improved; in addition, the tool electrode discharges in a fixed state, dislocation is not prone to being caused, and it can be ensured that the position and size of the machined hole body meet the design requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of heat insulation screen multi-hole processing, and in particular relates to a heat insulation screen multi-hole processing method. Background Art

[0002] The aircraft engine is the core component of the aircraft, and the heat shield is the core component for controlling the temperature of the aircraft engine. Among them, the heat shield has the characteristics of large size, curved surface, complex shape, thin wall and easy deformation. In addition, many small holes are usually processed on the heat shield, and the size and position of the processed holes need to meet the design requirements.

[0003] At present, when processing multiple holes on the heat shield, a CNC five-axis punching machine and an electrode are generally used for single-hole processing. However, the single-hole processing efficiency is low; and when processing on the curved surface of the heat shield, the electrode is in a rotating state, which is easy to cause misalignment, resulting in a deviation between the hole position and the design requirements; in addition, when processing materials with high melting points, the electrode is in a rotating discharge state, which is easy to cause a deviation between the hole size and the design requirements. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention provides a method for processing the multiple holes of a heat insulation screen, which can improve the processing efficiency of the multiple holes of the heat insulation screen.

[0005] The object of the present invention is achieved through the following technical solutions: A method for processing a porous heat shield comprises the following steps: Divide the heat shield parts into several parts to be processed along the circumferential direction; According to the axial direction of the hole to be processed at the processing part, the processing part is divided into a plurality of processing areas; Manufacturing tool electrodes matching a plurality of holes to be processed in the area to be processed; The tool electrode is used to perform electric spark forming processing on a plurality of holes to be processed in the processing area.

[0006] The beneficial effects of adopting the above technical solution are as follows: in this processing method, each tool electrode can process multiple holes to be processed in a region to be processed at a time, and multiple tool electrodes can process all holes to be processed in multiple regions to be processed, thereby facilitating the processing of all holes to be processed in all parts to be processed, processing the heat insulation shield to be porous, and improving the processing efficiency of the heat insulation shield to be porous; in addition, the tool electrode discharges in a fixed state, which is not easy to cause dislocation, and can ensure that the position and size of the processed holes meet the design requirements.

[0007] In one embodiment, dividing the heat shield part into a plurality of parts to be processed along the circumferential direction comprises: The heat shield parts are evenly divided into a number of identical parts to be processed along the circumference.

[0008] The beneficial effect of adopting the above technical solution is: it is arranged in this way so that each tool electrode can perform electrospark forming processing on the same area to be processed of multiple parts to be processed, which is beneficial to production cost and production time, and is conducive to efficient and low-cost processing.

[0009] In one embodiment, evenly dividing the heat shield part into a plurality of identical parts to be processed along the circumferential direction comprises: The number, size and relative position of the areas to be processed at different parts to be processed are the same.

[0010] In one embodiment, evenly dividing the heat shield part into a plurality of identical parts to be processed along the circumferential direction comprises: The number, size and relative position of the holes to be processed at different locations to be processed are the same.

[0011] In one embodiment, the portion to be processed is divided into a plurality of areas to be processed according to the axial direction of the hole to be processed at the portion to be processed, including: The axial directions of all the holes to be processed in any area to be processed are the same, and the axial directions of the holes to be processed in different areas to be processed are different.

[0012] The beneficial effect of adopting the above technical solution is: such an arrangement facilitates the tool electrode to perform electric spark forming processing on all the holes to be processed in a region to be processed.

[0013] In one embodiment, manufacturing a tool electrode matching a plurality of holes to be processed in a processing area includes: A tool electrode having a plurality of columnar electrodes is manufactured, wherein the number, size and relative position of the columnar electrodes respectively match the number, size and relative position of the holes to be processed in the area to be processed.

[0014] The beneficial effect of adopting the above technical solution is: such an arrangement makes it convenient to use the multiple columnar electrodes on the tool electrode to respectively process the multiple holes to be processed in the processing area.

[0015] In one embodiment, manufacturing a tool electrode matching a plurality of holes to be processed in a processing area includes: The axes of all the cylindrical electrodes on the same tool electrode are parallel to each other.

[0016] The beneficial effects of adopting the above technical solution are: such an arrangement, on the one hand, facilitates the processing of all columnar electrodes on the tool electrode, and on the other hand, is also conducive to processing all holes to be processed in a processing area through electrospark forming of a tool electrode.

[0017] In one embodiment, using a tool electrode to perform electrospark forming machining on a plurality of holes to be machined in a machining area includes: The tool electrode and the heat shield parts are mounted on the electric spark machining machine to perform electric spark forming machining on a plurality of holes to be machined in the machining area using the tool electrode.

[0018] In one embodiment, using a tool electrode to perform electrospark forming machining on a plurality of holes to be machined in a machining area includes: The tool electrode is replaced and the axial direction of the heat shield part is adjusted to perform electrospark forming processing on several holes to be processed in other areas to be processed.

[0019] The beneficial effect of adopting the above technical solution is: by replacing the tool electrode and adjusting the axial direction of the heat insulation shield part, the axial direction of the tool electrode can be consistent with the axial direction of the hole to be processed, which is conducive to electrospark forming processing of several holes to be processed in other areas to be processed.

[0020] In one embodiment, using a tool electrode to perform electrospark forming machining on a plurality of holes to be machined in a machining area includes: The circumferential position of the heat shield parts is adjusted to perform electrospark forming processing on a plurality of holes to be processed in the processing area of ​​other parts to be processed.

[0021] The beneficial effects of the present invention are: In the processing method, each tool electrode can process multiple holes to be processed in a processing area at a time, and multiple tool electrodes can process all the holes to be processed in multiple processing areas, thereby facilitating the processing of all the holes to be processed in all processing areas, processing the heat insulation shield to be porous, and improving the processing efficiency of the heat insulation shield to be porous; in addition, the tool electrode discharges in a fixed state, which is not easy to cause dislocation, and can ensure that the position and size of the processed holes meet the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein: Figure 1 shows a flow chart of the present invention; Figure 2 A schematic diagram showing the construction of the heat shield parts; Figure 3 The schematic diagram of the structure of the part to be processed is shown; Figure 4 A processing schematic diagram of the first area to be processed is shown; Figure 5 Shows Figure 4 Sectional view at AA in the middle; Figure 6A processing schematic diagram of the second area to be processed is shown; Figure 7 Shows Figure 6 Sectional view at the middle BB; Figure 8 A processing schematic diagram of the third area to be processed is shown; Fig. 9 A processing schematic diagram of the fourth area to be processed is shown; Fig.10 A processing schematic diagram of the fifth area to be processed is shown; In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0023] Reference numerals: 100-heat shield parts, 110-part to be processed, 111-first area to be processed, 112-second area to be processed, 113-third area to be processed, 114-fourth area to be processed, 115-fifth area to be processed, 200-hole to be processed, 300-first tool electrode, 400-second tool electrode, 500-third tool electrode, 600-fourth tool electrode, 700-fifth tool electrode. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Since the processing efficiency is low when using a CNC five-axis punching machine and electrode for single-hole processing, and the electrode is in a rotating state when processing on the curved surface of the heat insulation screen, it is easy to cause misalignment, resulting in a deviation between the hole position and the design requirements; in addition, when processing materials with a high melting point, the electrode is in a rotating discharge state, which is easy to cause a deviation between the hole size and the design requirements.

[0026] Therefore, the present invention provides a method for processing a heat shield having multiple holes, such as Figure 1-10 As shown, it includes the following steps: Divide the heat shield component 100 into a plurality of to-be-processed portions 110 along the circumferential direction; According to the axial direction of the hole 200 to be processed at the part 110 to be processed, the part 110 to be processed is divided into a plurality of areas to be processed; Manufacturing tool electrodes matching a plurality of holes 200 to be processed in the processing area; The tool electrode is used to perform electric spark forming machining on a plurality of holes 200 to be machined in the machining area.

[0027] It can be understood that in this processing method, each tool electrode can process multiple holes 200 to be processed in a processing area at a time, and multiple tool electrodes can process all the holes 200 to be processed in multiple processing areas, thereby facilitating the processing of all the holes 200 to be processed in all the processing parts 110, processing the heat insulation shield to be porous, and improving the processing efficiency of the heat insulation shield to be porous; in addition, the tool electrode discharges in a fixed state, which is not easy to cause misalignment, and can ensure that the position and size of the processed holes meet the design requirements.

[0028] It should be noted that the CNC five-axis punching machine is a single-hole processing machine, and it has many times of installing and removing the fixture. In addition, considering the characteristics of thin-walled parts that are easy to deform, the small holes processed by it are not well distributed. The present invention reduces the number of times the fixture is installed and removed, reduces the probability of deformation of the heat insulation screen part 100, and is conducive to making the small holes evenly distributed in accordance with the design requirements.

[0029] In addition, the price and maintenance costs of CNC five-axis punching machines are high. For example, the price of a domestic CNC five-axis punching machine with a stroke of 1500mm is higher than 2 million yuan per unit. The present invention does not require the use of expensive CNC five-axis punching machines, which reduces equipment procurement and maintenance costs. The procurement cost of ordinary EDM machine tools is relatively low, which can reduce the cost required for large-scale production, so that product delivery is guaranteed.

[0030] In one embodiment, dividing the heat shield part 100 into a plurality of to-be-processed parts 110 along the circumferential direction includes: The heat shield component 100 is evenly divided into a plurality of identical parts 110 to be processed along the circumferential direction.

[0031] It is understandable that such an arrangement enables each tool electrode to perform EDM on the same area to be processed of multiple parts to be processed 110, which is beneficial to production cost and production time, thereby facilitating efficient and low-cost processing.

[0032] In one embodiment, the heat shield component 100 is evenly divided into a plurality of identical parts 110 to be processed along the circumferential direction, including: The number, size and relative position of the areas to be processed at different parts to be processed 110 are the same.

[0033] In one embodiment, the heat shield component 100 is evenly divided into a plurality of identical parts 110 to be processed along the circumferential direction, including: The number, size and relative position of the holes 200 to be processed at different locations 110 to be processed are the same.

[0034] In one embodiment, according to the axial direction of the hole 200 to be processed at the portion 110 to be processed, the portion 110 to be processed is divided into several areas to be processed, including: The axial directions of all the holes 200 to be processed in any area to be processed are the same, and the axial directions of the holes 200 to be processed in different areas to be processed are different.

[0035] It can be understood that such an arrangement facilitates the tool electrode to perform electrospark forming machining on all the holes 200 to be machined in a region to be machined.

[0036] In one embodiment, manufacturing a tool electrode matching a plurality of holes 200 to be processed in a processing area includes: A tool electrode having a plurality of columnar electrodes is manufactured, and the number, size and relative positions of the columnar electrodes respectively match the number, size and relative positions of the hole bodies 200 to be processed in the processing area.

[0037] It can be understood that such an arrangement is used to facilitate the use of multiple columnar electrodes on the tool electrode to respectively process multiple to-be-processed hole bodies 200 in the processing area.

[0038] In one embodiment, manufacturing a tool electrode matching a plurality of holes 200 to be processed in a processing area includes: The axes of all the cylindrical electrodes on the same tool electrode are parallel to each other.

[0039] It is understandable that such a configuration is convenient for processing all columnar electrodes on the tool electrode on the one hand, and is also conducive to processing all the holes 200 to be processed in a processing area by electrospark forming with a tool electrode on the other hand.

[0040] In one embodiment, using a tool electrode to perform electric spark forming machining on a plurality of to-be-machined holes 200 in a to-be-machined area includes: The tool electrode and the heat shield component 100 are mounted on an EDM machine tool, so as to use the tool electrode to perform EDM forming processing on a plurality of holes 200 to be processed in a processing area.

[0041] In one embodiment, using a tool electrode to perform electric spark forming machining on a plurality of to-be-machined holes 200 in a to-be-machined area includes: The tool electrode is replaced, and the axial direction of the heat shield component 100 is adjusted to perform electric spark forming processing on a plurality of hole bodies 200 to be processed in other areas to be processed.

[0042] It is understandable that by replacing the tool electrode and adjusting the axial direction of the heat shield part 100, the axial direction of the tool electrode can be made consistent with the axial direction of the hole body 200 to be processed, thereby facilitating the electrospark forming processing of several hole bodies 200 to be processed in other processing areas.

[0043] In one embodiment, using a tool electrode to perform electric spark forming machining on a plurality of to-be-machined holes 200 in a to-be-machined area includes: The circumferential position of the heat shield component 100 is adjusted to perform electrospark forming processing on a plurality of to-be-processed holes 200 in the to-be-processed area of ​​other to-be-processed parts 110 .

[0044] A typical heat shield component 100 is processed below. The heat shield component 100 is evenly divided into sixteen to-be-processed portions 110 along the circumferential direction. Since the hole 200 to be processed has five axial directions, the to-be-processed portions 110 are divided into the following: Figure 3 The five to-be-processed areas shown are a first to-be-processed area 111, a second to-be-processed area 112, a third to-be-processed area 113, a fourth to-be-processed area 114 and a fifth to-be-processed area 115. Figure 4-10 As shown, the matched first tool electrode 300 , the second tool electrode 400 , the third tool electrode 500 , the fourth tool electrode 600 and the fifth tool electrode 700 are used to perform electric spark forming machining on a plurality of holes 200 to be machined in the machining area.

[0045] Each area to be processed can be processed in turn for roughing and fine processing. During roughing, the peak value of the low-voltage current of the main power supply of the EDM machine tool is 8A, the control voltage of the auxiliary power circuit is 5V, the discharge pulse time is 200us, the discharge rest time is 50us, the discharge time is 1us, and the jump rise time is 1us; during fine processing, the peak value of the low-voltage current of the main power supply of the EDM machine tool is 4A, the control voltage of the auxiliary power circuit is 5V, the discharge pulse time is 100us, the discharge rest time is 30us, the discharge time is 1us, and the jump rise time is 1us.

[0046] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A method for processing a porous heat shield, characterized in that: The following steps are involved: Dividing the heat shield component (100) into a plurality of parts to be processed (110) along the circumferential direction; Dividing the to-be-processed portion (110) into a plurality of to-be-processed areas according to the axial direction of the to-be-processed hole (200) at the to-be-processed portion (110); Manufacturing a tool electrode that matches a plurality of to-be-processed holes (200) in the to-be-processed area; A tool electrode is used to perform electric spark forming processing on a plurality of holes (200) to be processed in a processing area.

2. A method for processing a porous heat shield according to claim 1, characterized in that: The step of dividing the heat shield component (100) into a plurality of parts to be processed (110) along the circumferential direction comprises: The heat shield component (100) is evenly divided into a plurality of identical parts (110) to be processed along the circumferential direction.

3. A method for processing a porous heat shield according to claim 2, characterized in that: The step of uniformly dividing the heat shield component (100) along the circumferential direction into a plurality of identical parts to be processed (110) comprises: The number, size and relative position of the areas to be processed at different to-be-processed locations (110) are the same.

4. A method for processing a porous heat shield according to claim 2 or 3, characterized in that: The step of uniformly dividing the heat shield component (100) along the circumferential direction into a plurality of identical parts to be processed (110) comprises: The number, size and relative position of the holes (200) to be processed at different locations (110) to be processed are the same.

5. A method for processing a porous heat shield according to claim 1 or 2, characterized in that: The step of dividing the portion to be processed (110) into a plurality of areas to be processed according to the axial direction of the hole body to be processed (200) at the portion to be processed (110) comprises: The axial directions of all the holes (200) to be processed in any area to be processed are the same, and the axial directions of the holes (200) to be processed in different areas to be processed are different.

6. A method for processing a porous heat shield according to claim 1 or 2, characterized in that: The method of manufacturing a tool electrode matching a plurality of to-be-processed holes (200) in an area to be processed comprises: A tool electrode having a plurality of columnar electrodes is manufactured, wherein the number, size and relative position of the columnar electrodes respectively match the number, size and relative position of the hole bodies (200) to be processed in the area to be processed.

7. A method for processing a porous heat shield according to claim 6, characterized in that: The method of manufacturing a tool electrode matching a plurality of to-be-processed holes (200) in an area to be processed comprises: The axes of all the cylindrical electrodes on the same tool electrode are parallel to each other.

8. The method for processing a porous heat shield according to claim 1, characterized in that: The method of performing electric spark forming processing on a plurality of to-be-processed holes (200) in a processing area using a tool electrode comprises: The tool electrode and the heat shield part (100) are mounted on an electric spark machining machine, so that the tool electrode is used to perform electric spark forming machining on a plurality of to-be-machined holes (200) in a to-be-machined area.

9. A method for processing a porous heat shield according to claim 8, characterized in that: The method of performing electric spark forming processing on a plurality of to-be-processed holes (200) in a processing area using a tool electrode comprises: The tool electrode is replaced, and the axial direction of the heat shield component (100) is adjusted to perform electric spark forming processing on a plurality of to-be-processed hole bodies (200) in other to-be-processed areas.

10. A method for processing a porous heat shield according to claim 8 or 9, characterized in that: The method of performing electric spark forming processing on a plurality of to-be-processed holes (200) in a processing area using a tool electrode comprises: The circumferential position of the heat shield component (100) is adjusted to perform electric spark forming processing on a plurality of to-be-processed holes (200) in the to-be-processed area of ​​other to-be-processed parts (110).

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