CN114226898A - Method for determining hole site of air film hole - Google Patents
Method for determining hole site of air film hole Download PDFInfo
- Publication number
- CN114226898A CN114226898A CN202210170713.7A CN202210170713A CN114226898A CN 114226898 A CN114226898 A CN 114226898A CN 202210170713 A CN202210170713 A CN 202210170713A CN 114226898 A CN114226898 A CN 114226898A
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- China
- Prior art keywords
- film hole
- hole
- determining
- piece
- air film
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
- B23H11/003—Mounting of workpieces, e.g. working-tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2500/00—Holding and positioning of tool electrodes
- B23H2500/20—Methods or devices for detecting wire or workpiece position
Abstract
The invention relates to the technical field of turbine blade machining, in particular to a method for determining the hole position of an air film hole, which is matched with an electric pulse forming machine tool for use; the electric pulse forming machine tool comprises a processing table and a processing shaft; the method for determining the hole position of the gas film hole comprises the step of placing a marked sample piece in a gas film hole of a standard sample piece, and moving a wire electrode to a processing background mobile processing shaft. And determining the current position of the air film hole by automatic centering of the electric pulse forming machine tool. The positioning is performed through the gas film hole of the standard sample piece. When the electrode wire enters the air film hole of the standard sample piece, the processing shaft automatically performs centering, and then the electric pulse forming machine tool performs automatic centering. The electric pulse forming machine tool has high precision in automatic alignment, and further effectively ensures that the hole position of the air film hole is determined accurately. Meanwhile, the manual repeated centering is avoided, the accuracy of the found center is verified, and the efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of turbine blade machining, in particular to a method for determining hole positions of air film holes.
Background
Aircraft blades include turbine blades and guide vanes. They are all provided with a plurality of air film holes. The machining of the air film hole generally adopts an electrode wire to carry out electric discharge machining. In the prior art, a standard sample piece is placed on a processing table of an electric pulse forming machine tool, and then a processing part of the electric pulse forming machine tool is moved manually, so that electrode wires of the processing part are inserted into gas film holes of the standard sample piece one by one. And then the electric pulse forming machine tool records the position of each air film hole, so that the electric pulse forming machine tool automatically processes the air film hole at each recorded position. The tool setting method has high requirement on labor. Meanwhile, the electrode wire is soft, and can extend into the air film hole if the position of the electrode wire has error. This results in a lower accuracy of the machining. At the same time, the number of film holes of one blade can be as many as several tens. This approach is very inefficient for tool setting.
Disclosure of Invention
The invention aims to provide a method for determining the position of a gas film hole, which can be used for quickly determining the position of the gas film hole and further quickly setting a tool.
The embodiment of the invention is realized by the following technical scheme:
a method for determining the hole position of a gas film hole is matched with an electric pulse forming machine tool for use; the electric pulse forming machine tool comprises a processing table and a processing shaft; the method for determining the hole position of the air film hole comprises the following steps:
s1: connecting the standard sample piece to a processing table;
s2: controlling the processing shaft to move and enabling the electrode wire of the processing shaft to extend into the air film hole of the standard sample piece;
s3: controlling an electric pulse forming machine tool to automatically find the center and recording the center position of the air film hole after finding the center;
s4: the steps of S2 and S3 are repeated to center the remaining gas film holes of the master sample and record the center position.
Further, the outer diameter of the electrode wire is 0.45 mm; the aperture of the air film hole of the standard sample piece is 2mm or 3 mm.
Further, the standard sample piece is used for machining a gas film hole through a machine tool.
Further, the standard sample piece is a turbine blade sample piece; the turbine blade sample piece comprises a sample piece part and a chuck arranged at one end of the sample piece part; the shape and the size of the chuck of the turbine blade sample piece are the same as those of the chuck of the turbine blade; the sample part is provided with a gas film hole; when the chuck of the turbine blade sample is clamped on the processing platform, the position of the air film hole of the sample part is the same as the position of the air film hole of the turbine blade when the chuck of the turbine blade is clamped on the processing platform.
Further, the sample part is arranged to be in a rectangular column shape.
Further, the processing table is provided with a clamp for clamping the chuck; the clamp comprises a base body, a fixed clamping piece and a movable clamping piece; the base body is connected to the processing table through a screw; the movable clamping piece is arranged opposite to the fixed clamping piece; the movable clamping piece is provided with an adjusting screw; the adjusting screw is in threaded connection with the seat body; the opposite surfaces of the fixed clamping piece and the movable clamping piece are matched with the clamping head and are provided with clamping teeth.
Further, the standard sample piece is a guide vane sample piece; the guide blade sample piece is provided with a gas film hole and a clamping part; when the clamping part is clamped on the processing table, the position of the gas film hole of the guide blade sample piece is the same as the position of the gas film hole of the guide blade when the guide blade is clamped on the processing table.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the method for determining the hole position of the air film hole is used for positioning through the air film hole of the standard sample piece. When the electrode wire enters the air film hole of the standard sample piece, the processing shaft automatically performs centering, and then the electric pulse forming machine tool performs automatic centering. The electric pulse forming machine tool has high precision in automatic alignment, and further effectively ensures that the hole position of the air film hole is determined accurately. Meanwhile, the manual repeated centering is avoided, the accuracy of the found center is verified, and the efficiency is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a clamp according to the present invention;
FIG. 2 is a schematic view of a guide vane;
FIG. 3 is a schematic view of a turbine blade.
Icon: 1-guide vane, 2-air film hole, 3-turbine vane, 31-clamping head, 4-processing table, 5-clamp, 51-base, 52-fixed clamping piece, 53-movable clamping piece and 54-adjusting screw.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of this application is used, the description is merely for convenience and simplicity of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in fig. 1-3, the present invention provides a method for determining the hole position of an air film hole, which is suitable for an electric pulse forming machine tool. The electric pulse forming machine includes a machining table 4 and a machining spindle. The processing table 4 is used for placing the processed workpiece to be processed. The processing shaft is provided with an electrode wire. The processing shaft can move relative to the processing table 4, so that the processing shaft moves to the workpiece to be processed and processes the workpiece to be processed through the electrode wire. The method for determining the hole position of the air film hole comprises the following steps:
s1: the standard sample is attached to the processing table 4, and the standard sample is fixed to the processing table 4. The standard sample piece can be drilled by equipment such as a drilling machine before processing, and further the hole site of the air film hole 2 on the standard sample piece is processed accurately. When the standard sample piece is placed on the processing table 4, the positions of the plurality of air film holes 2 are the same and correspond to the processing positions of the plurality of air film holes 2 when the workpiece to be processed is placed on the processing table 4 one by one. The outer diameter of the electrode wire is 0.45mm, and the aperture of the processed air film hole 2 is 0.5 mm. In order to enable the electrode wire to easily extend into the gas film hole 2 of the standard sample piece, the aperture of the gas film hole 2 of the standard sample piece is 2mm or 3 mm. This reduces the control difficulty of the electrical pulse forming machine tool for workers when the wire electrode extends into the gas film hole 2 of the standard sample piece. Meanwhile, the aperture of the air film hole 2 of the standard sample piece is 2mm or 3mm, so that the time for automatically finding the center of the machine tool is reduced, and the efficiency is improved.
S2: the electric pulse forming machine tool is controlled manually, namely, the processing shaft can be controlled to move relative to the processing table 4. And controlling the machining shaft to move and enabling the electrode wire of the machining shaft to extend into the air film hole 2 of the standard sample piece.
S3: and controlling an electric pulse forming machine tool to automatically find the center and recording the center position of the air film hole 2 after finding the center. Automatic centering is a common function of an electric pulse forming machine tool. Specifically, after the automatic centering program is started, the processing shaft of the electric pulse forming machine moves in multiple directions in the horizontal direction, so that the electrode wire moves in multiple directions and abuts against the inner walls of the air film hole 2 at different positions. The center of the air film hole 2 can be calculated after the electrode wire collides with the wall for many times. The electric pulse forming machine finds the center of the current air film hole 2 and records the center position.
S4: the steps of S2 and S3 are repeated to center the remaining gas film holes 2 of the master sample and record the center position. And after the centers of all the air film holes 2 are found out, the tool setting work is finished.
After the tool setting is finished, the standard sample piece is taken down, and the workpiece to be processed is clamped on the processing table 4. And starting the electric pulse forming machine tool, and then machining and punching the substitute machined part by the machining shaft according to the recorded central position of each air film hole 2.
The method for determining the hole position of the air film hole is used for positioning through the air film hole 2 of the standard sample. When the electrode wire enters the air film hole 2 of the standard sample piece, the processing shaft automatically performs centering, and then the electric pulse forming machine tool performs automatic centering. The automatic centering precision of the electric pulse forming machine tool is high, and the accuracy of the hole position determination of the air film hole 2 is effectively guaranteed. Meanwhile, the manual repeated centering is avoided, the accuracy of the found center is verified, and the efficiency is further improved.
In this embodiment, the master sample is a turbine blade sample. The turbine blade 3 is provided with a collet 31 at one end. The machining table 4 is provided with a jig 5 that holds the chuck 31. The clamp 5 includes a seat body 51, a fixed jaw 52 and a movable jaw 53. The holder body 51 is connected to the processing table 4 by screws. The moving jaw 53 is disposed opposite to the fixed jaw 52. The moving jaw 53 is provided with an adjustment screw 54. The adjusting screw 54 is screwed to the holder body 51. The opposing faces of the fixed jaw 52 and the moving jaw 53 are provided with clamping teeth in cooperation with the chuck 31. The movable clamping piece 53 is controlled to move relative to the fixed clamping piece 52 by the rotation of the adjusting screw 54, so as to clamp or unclamp the clamping head 31, and further to fix or remove the turbine blade 3 to or from the machining table 4. The turbine blade sample includes a sample portion and a collet 31 disposed at one end of the sample portion. The shape and size of the collet 31 of the turbine blade sample is the same as the shape and size of the collet 31 of the turbine blade 3. The sample part is provided with a gas film hole 2. When the collet 31 of the turbine blade sample is mounted on the machining table 4, the position of the film hole 2 of the sample portion is the same as the position of the film hole 2 of the turbine blade 3 when the collet 31 of the turbine blade 3 is mounted on the machining table 4. The sample part is arranged in a rectangular column shape. When the turbine blade sample is machined, the positions of the clamp 31 and the film hole 2 need only be the same as the positions of the clamp 31 and the film hole 2 of the turbine blade 3. The specific shape of the sample part can be set at will, and further the processing of the turbine blade sample is simplified.
In this embodiment, the standard sample is a guide vane sample. The guide vane sample is provided with a film hole 2 and a clamping part. When the clamping portion is clamped on the processing table 4, the position of the film hole 2 of the guide vane sample piece is the same as the position of the film hole 2 of the guide vane 1 when the guide vane 1 is clamped on the processing table 4. Since the shape of the guide vane 1 is profiled and the guide vane 1 has no parts dedicated to clamping. Therefore, the guide vane 1 is generally a clamping device that clamps the guide vane by a clamp 5 and then fixes the clamp 5 to the machining table 4. In order to simplify the guide vane sample, which is easy to process, the guide vane sample comprises a gas film hole 2 and a clamping portion. The clamping part is used for being matched with a clamping device of the processing table 4, so that the guide vane sample piece is conveniently clamped on the processing table 4.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for determining the hole position of a gas film hole is matched with an electric pulse forming machine tool for use; the electric pulse forming machine tool comprises a processing table (4) and a processing shaft; the method is characterized in that: the method for determining the hole position of the air film hole comprises the following steps:
s1: connecting the standard sample piece to a processing table (4);
s2: controlling the machining shaft to move and enabling the electrode wire of the machining shaft to extend into the gas film hole (2) of the standard sample piece;
s3: controlling an electric pulse forming machine tool to automatically find the center and recording the central position of the air film hole (2) after finding the center;
s4: the steps of S2 and S3 are repeated to center the remaining gas film holes (2) of the master sample and record the center position.
2. The method of determining a pore site of a gas film according to claim 1, characterized in that: the outer diameter of the electrode wire is 0.45 mm; the aperture of the air film hole (2) of the standard sample piece is 2mm or 3 mm.
3. The method of determining a pore site of a gas film according to claim 2, characterized in that: and the standard sample piece is used for machining a gas film hole (2) through a machine tool.
4. The method of determining a pore site of a gas film according to claim 1, characterized in that: the standard sample piece is a turbine blade sample piece; the turbine blade sample comprises a sample part and a clamping head (31) arranged at one end of the sample part; the shape and the size of the chuck (31) of the turbine blade sample piece are the same as those of the chuck (31) of the turbine blade (3); the sample part is provided with a gas film hole (2); when the chuck (31) of the turbine blade sample is clamped on the processing table (4), the position of the air film hole (2) of the sample part is the same as the position of the air film hole (2) of the turbine blade (3) when the chuck (31) of the turbine blade (3) is clamped on the processing table (4).
5. The method of determining the position of a gas film hole according to claim 4, wherein: the sample part is arranged in a rectangular column shape.
6. The method of determining the position of a gas film hole according to claim 4, wherein: the processing table (4) is provided with a clamp (5) for clamping the chuck (31); the clamp (5) comprises a base body (51), a fixed clamping piece (52) and a movable clamping piece (53); the base body (51) is connected to the processing table (4) through screws; the movable clamping piece (53) is arranged opposite to the fixed clamping piece (52); the movable clamping piece (53) is provided with an adjusting screw (54); the adjusting screw (54) is in threaded connection with the seat body (51); the opposite surfaces of the fixed clamping piece (52) and the movable clamping piece (53) are matched with the clamping head (31) and are provided with clamping teeth.
7. The method of determining a pore site of a gas film according to claim 1, characterized in that: the standard sample piece is a guide vane (1) sample piece; the guide blade sample piece is provided with a gas film hole (2) and a clamping part; when clamping part dress was pressed from both sides in processing platform (4), the position of the air film hole (2) of guide vane sample piece is the same guide vane (1) dress clamp in when processing platform (4) the position of air film hole (2) of guide vane (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210170713.7A CN114226898A (en) | 2022-02-24 | 2022-02-24 | Method for determining hole site of air film hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210170713.7A CN114226898A (en) | 2022-02-24 | 2022-02-24 | Method for determining hole site of air film hole |
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| CN114226898A true CN114226898A (en) | 2022-03-25 |
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| CN202210170713.7A Pending CN114226898A (en) | 2022-02-24 | 2022-02-24 | Method for determining hole site of air film hole |
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Application publication date: 20220325 |
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