CN113843586A - Combined machining method for complex curved surface safety filter screen of aircraft hydraulic system - Google Patents
Combined machining method for complex curved surface safety filter screen of aircraft hydraulic system Download PDFInfo
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- CN113843586A CN113843586A CN202111089937.7A CN202111089937A CN113843586A CN 113843586 A CN113843586 A CN 113843586A CN 202111089937 A CN202111089937 A CN 202111089937A CN 113843586 A CN113843586 A CN 113843586A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
- B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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Abstract
The invention discloses a combined machining method for a complex curved surface safety filter screen of an airplane hydraulic system, and belongs to the technical field of airplane part machining. The method comprises the steps of processing a micro-through hole array on a raw material plate by using a femtosecond laser rotary cutting technology; then, punching the plate with the micro through hole array by using a punching machine tool to form a curved screen structure with folds; and finally, cutting the end part of the curved screen, and welding a base through the cut end part to form the safe filter screen. The processing method has the advantages of high efficiency, convenience and high processing precision, and is particularly suitable for processing parts with small size and high complexity.
Description
Technical Field
The invention belongs to the technical field of airplane part processing, and particularly relates to a laser stamping combined processing method for a complex curved surface safety filter screen of an airplane hydraulic system.
Background
Orifices, safety valves and other sensitive components in aircraft hydraulic systems are immune to small particle contaminants, but large particle contaminants render these components ineffective with catastrophic consequences. During operation of the aircraft hydraulic system, the filter keeps the main flow passage clean, and large particle pollutants introduced during operation of the system for a period of time need to be protected by a safety filter screen. Such safety screens are typically located upstream of, or integrated with, important components such as check valves, choke valves, and safety valves. Failure can quickly result in an even greater risk once the screen is deactivated.
The hydraulic system of the airplane is a very complex system, and a plurality of various parts are involved. Because the shapes of the parts using the safety filter screen are different, the required safety filter screen can be adjusted according to the shapes of the parts. The structure of some parts is more regular, but still there will be a larger part of parts that need a safety filter screen with a complex curved surface. For example, a safety screen having pleats on the surface. Meanwhile, the size of the parts is small, even the parts are in millimeter level, the whole structure is less than one centimeter, the surfaces have microchannels, and the processing difficulty of the tiny parts with complex curved surfaces is very high. For example, for a curved safety filter screen with a length of several millimeters, the curved surface of the pleat is small in length and complex in shape, so that the curved surface of the pleat is difficult to form, and micropores on the curved surface of the pleat are difficult to form, and especially the shape of the micropores on the root of the pleat is difficult to maintain regular circular through holes.
The laser rotary cutting method enables a light beam entering a focusing mirror to translate and tilt through an optical device, uses a high-speed motor to realize the rotation of an optical axis of the light beam, changes the inclination angle of the light beam relative to the surface of a material, obtains the focusing light beam of a vertical cone, a positive cone and an inverted cone, and can generally realize that the focusing light beam is more than 10: 1, the method has the advantages of high efficiency, good quality, high accuracy, almost no material selectivity and the like. At present, the laser rotary cutting method is mainly applied to the preparation of microstructures in the field of high-precision machining, including aeroengine turbine blade air film holes, silicon carbide probe card micropores in wafer tests, airplane carbon fiber composite microstructures and the like, and the application in the machining aspect of micro parts with complex curved surfaces is not reported for a while.
Disclosure of Invention
In order to solve the processing problem of the safety filter screen with a complex curved surface in the current aircraft hydraulic system, the invention provides a combined processing method for the safety filter screen with the complex curved surface of the aircraft hydraulic system, and the technical scheme is as follows:
a combined processing method for a complex curved surface safety filter screen of an airplane hydraulic system is characterized in that a femtosecond laser rotary cutting technology is utilized to process a micro through hole array on a raw material plate; then, punching the plate with the micro through hole array by using a punching machine tool to form a curved screen structure with folds; and finally, cutting the end part of the curved screen, and welding a base through the cut end part to form the safe filter screen.
Preferably, the steps of the combined processing method are as follows:
s1: mounting the selected stainless steel raw material plate on a femtosecond laser rotary cutting platform, carrying out micro-channel processing treatment, and obtaining a plate with micro through holes after the treatment is finished;
s2: taking down the processed plate with the micro through holes from the femtosecond laser rotary cutting platform, installing the plate on a punching machine tool for punching, cutting off the end part of the punched curved surface screen mesh structure with the wrinkled surface, and obtaining the curved surface screen mesh structure with the wrinkled surface;
s3: and welding a base at the cut end part by using laser brazing to obtain the safe filter screen.
Preferably, step S1 of the method specifically includes the following steps:
s11: mounting the selected stainless steel plate raw material on a femtosecond laser rotary cutting platform;
s12: guiding the micropore pattern to be processed into a control computer of a femtosecond laser rotary cutting platform, and setting femtosecond processing technological parameters;
s13: starting a femtosecond laser rotary cutting processing platform, and forming a micro through hole array on a raw material plate according to a preloaded processing path to form a surface micro through hole plate;
s14: and taking down the surface micro-perforated plate after the processing is finished.
Preferably, the stainless steel sheet material is processed as follows after being mounted on a rotary cutting platform:
1) putting the plate into an ultrasonic cleaning machine, and cleaning for 1-3 min;
2) taking out the plate, wiping the surface moisture, putting the plate into a dryer, and drying the plate for 2-4 min at the temperature of 150-250 ℃;
3) and (5) drying, taking out the plate, and performing surface film pressing by using a film pressing machine. The film pressing is to prevent the surface of the plate from being scratched, and the protective film is torn off when the film pressing is used.
Preferably, the material selected for the lamination in step 3) is PE.
Preferably, the process parameters in step S12 are: the wavelength is 1030nm, the repetition frequency is 1000 kHz-2000 kHz, the average power is 15-30W, the pulse width is 443fs, the scanning speed is 100-260 mm/s, and the laser mode TEM00 is adopted, wherein M2 is 1.119.
Preferably, the micro via array of step S13 is a rectangular or circular array.
Preferably, the step S2 is a step of press working as follows:
s21: cutting and blanking: placing the plate at the processing position of a stamping machine tool, and cutting and blanking by adopting a cutting die to obtain a circular flat plate blank;
s22: primary stamping deformation: after cutting and blanking, keeping the processing position of the circular flat plate blank fixed, replacing a stamping die, carrying out primary stamping deformation on the circular flat plate blank by adopting a deep drawing deformation die CM-01, controlling the head of the screen to be formed, and obtaining a primary stamping deformation part by generating curved surface appearance deformation and not generating structural deformation in the process of forming the head of the screen;
s23: secondary stamping deformation: after the primary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out secondary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-02, controlling the wrinkle forming of the middle area of the screen, and obtaining a secondary stamping deformation piece without generating structural deformation due to the generation of curved surface appearance deformation in the wrinkle forming process of the middle area of the screen;
s24: and (3) third stamping deformation: after secondary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out tertiary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-03, controlling the formation of the bottom area of the screen, including fold extrusion forming, wherein the curved surface appearance deformation is generated in the forming process of the bottom area of the screen, the structural deformation is not generated, and the tertiary stamping deformation piece is obtained;
s25: primary shape correction: after the third stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, adopting a wrinkle correction die CQ-01 to correct the stamping deformation piece, and correcting the whole shape of the curved surface of the screen, including the primary wrinkle correction, so as to obtain a quasi-finished stamping part;
s26: secondary shape correction and blanking: after primary shape correction, keeping the processing position of the quasi-finished product stamping part fixed, replacing a stamping die, performing secondary shape correction on the quasi-finished product stamping part by adopting a fold shape correction-cutting composite die CQ-02, performing final shape correction on the curved surface and the folds of the screen, and cutting the bottom of the finished product stamping part to form a circular flat end shell surface to obtain a finished product stamping part;
s27: and (3) testing a stamping sample: the shape and size of the curved surface, the folded curved surface and the micropores on the curved surface of the finished product stamping part are detected, and the requirements on the size and precision of the curved surface screen with folds on the surface are met.
Preferably, the punching depth of one-time punching deformation is 1 mm; secondary stamping deformation is carried out, and the stamping depth is 2 mm; and (5) performing three-time stamping deformation, wherein the stamping depth is 3 mm.
Preferably, the top end round angle of the three-time stamping deformation piece obtained by three-time stamping deformation is 15 degrees.
Compared with the prior art, the invention has the following beneficial effects:
the femtosecond laser rotary cutting technology is combined with the stamping processing, the femtosecond laser rotary cutting technology is firstly utilized to process a micro through hole array with a large depth-diameter ratio on a raw material plate, and then a stamping machine tool is utilized to process a flat plate with the surface provided with the micro through hole array, so that a screen mesh structure with complex curved surfaces such as folds and the like on the surface is formed. And finally, processing the end part of the screen and welding a base to form a complete safe filter screen. The processing method has the advantages of high efficiency, convenience and high processing precision, and is particularly suitable for processing parts with small size and high complexity.
The invention adopts a multiple stamping technology, controls the deformation of the circular through hole in the elastic deformation range of the material by three times of stamping including two times of shape correction, and keeps the shape of the circular hole unchanged. In the stamping forming process of the material, the appearance deformation of the curved surface is generated, the structural deformation is not generated, and the shape of the round hole is not deformed.
Drawings
Fig. 1 is a schematic side view of a safety screen according to a preferred embodiment of the present invention.
FIG. 2 is a schematic view of a micro-pore array of a safety screen according to a preferred embodiment of the present invention.
FIG. 3 is a schematic top view of a circular flat plate blank processed through a die CL-01 in a preferred embodiment of the invention.
Fig. 4 is a schematic side sectional view showing a workpiece machined by using a drawing-deforming die CM-01 according to a preferred embodiment of the present invention.
Fig. 5 is a schematic side sectional view showing a workpiece machined by using a drawing-deforming die CM-02 in a preferred embodiment of the present invention.
Fig. 6 is a schematic side sectional view showing a workpiece machined by using a drawing-deforming die CM-03 according to a preferred embodiment of the present invention.
Fig. 7 is a schematic side view of a cross-sectional structure of a workpiece machined by using a wrinkle correction jig CQ-01 according to a preferred embodiment of the present invention.
Fig. 8 is a schematic side view of a cross-sectional structure of a workpiece machined by using a wrinkle correction and cutting composite mold CQ-02 according to a preferred embodiment of the present invention.
Fig. 9 shows a product formed by the combined machining method of the present invention (with micro-via holes omitted).
Wherein, 1, a base; 2, a screen body; 3, wrinkling; 4, micro-pores.
Detailed Description
The materials, reagents, devices, apparatuses, methods and processes used in the following examples are not specifically described, and are all materials, reagents, devices, apparatuses, methods and processes which are common in the art, and are commercially available to those skilled in the art or can be routinely set up according to specific needs without any creative effort.
The femtosecond rotational machining platform used in the following examples was Axinite IR-30. The press working machine used was JH 31K-80. The control program in the process can be adjusted and determined by those skilled in the art according to the actual working conditions and the quality requirements of specific products and by combining with the common knowledge in the field, and is not in the discussion scope of the application.
The following plates were mounted on a femtosecond laser rotary cutting platform and were treated as follows:
1) putting the plate into an ultrasonic cleaning machine, and cleaning for 1-3 min;
2) taking out the plate, wiping the surface moisture, putting the plate into a dryer, and drying the plate for 2-4 min at the temperature of 150-250 ℃;
3) and (5) drying, taking out the plate, and performing surface film pressing by using a film pressing machine. Wherein, the press mold is in order to prevent panel surface fish tail, tears the protection film again when waiting to use.
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Fig. 1 is a schematic side view of a safety screen according to a preferred embodiment of the present invention. As can be seen from figure 1, the safety filter screen comprises two parts, wherein the right side of the safety filter screen is a screen body 2 with a circular curved surface, and an annular base 1 is fixedly connected with the left end face of the screen body 2. Be equipped with round fold 3 on screen cloth body 2, all seted up the micro-through hole on screen cloth body 2 is whole, including on the fold.
FIG. 2 is a schematic view of a micro-pore array of a safety screen according to a preferred embodiment of the present invention. As can be seen from fig. 2, the array of micro-holes 4 on the safety screen is a rectangular array.
Detailed description of the invention
The embodiment provides a processing method of a safety filter screen with folds, which comprises the following steps:
s1: taking a stainless steel plate as an example, a blank plate material is processed by a femtosecond laser rotary cutting method through a micro-through hole with a large depth-diameter ratio on a stainless steel flat plate to obtain a micro-hole array on the surface of the stainless steel flat plate, and then the micro-hole array is formed by compression molding to obtain a curved screen with folds;
the method comprises the following steps of clamping a stainless steel flat plate on a femtosecond laser rotary cutting processing platform to process a micro-porous surface structure, wherein the specific processing steps are as follows:
s11: clamping a stainless steel flat plate on a femtosecond laser rotary cutting processing platform;
s12: introducing a micro-hole processing graph on computer software, and setting femtosecond laser processing technological parameters; the specific processing technological parameters are as follows:
wavelength 1030nm, repetition frequency 1000kHz, average power 30W, pulse width 443fs, scanning speed 100mm/s, laser mode TEM00, M2 1.119.
S13: starting the femtosecond laser rotary cutting processing platform, arranging micropores according to a certain processing track, for example, according to a rectangular array, starting micro-through hole processing on a stainless steel flat plate, and processing a micro-through hole surface structure to form a surface micro-through hole flat plate;
s14: and (5) after the processing is finished, removing the surface micro-perforated flat plate and carrying out the next step.
S2: stamping and forming the surface micro-perforated flat plate obtained in the step S1 by using a stamping machine tool, and mounting the surface micro-perforated flat plate on the stamping machine tool; and starting the punching machine tool equipment, wherein the punching machine tool enables the forming die to carry out micro-punching and shaping on the surface micro-through hole flat plate, a curved surface screen with folds is processed, and meanwhile, the end part of the screen is cut. The method comprises the following specific steps:
s21: cutting and blanking: placing the plate at the processing position of a punching machine tool, and cutting and blanking by adopting a cutting die CL-01 to obtain a circular flat plate blank; the circular flat plate blank after treatment with cutting die CL-01 is shown in fig. 3.
S22: primary stamping deformation: after cutting and blanking, keeping the processing position of the circular flat plate blank fixed, replacing a stamping die, carrying out primary stamping deformation on the circular flat plate blank by adopting a deep drawing deformation die CM-01, wherein the stamping depth is 1mm, controlling the forming of a screen head, and obtaining a primary stamping deformation part, wherein the screen head generates curved surface appearance deformation and does not generate structural deformation in the forming process; the drawing deformation die CM-01 used is shown in FIG. 4.
S23: secondary stamping deformation: after the primary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out secondary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-02, wherein the stamping depth is 2mm, controlling the wrinkle forming of the middle area of the screen, and obtaining a secondary stamping deformation piece by generating curved surface appearance deformation and not generating structural deformation in the wrinkle forming process of the middle area of the screen; the schematic cross-sectional structure of the drawing deformation die CM-02 and the workpiece is shown in FIG. 5.
S24: and (3) third stamping deformation: after secondary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out tertiary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-03, wherein the stamping depth is 3mm, controlling the bottom area of the screen to be formed, including fold extrusion forming, generating curved surface appearance deformation in the process of forming the bottom area of the screen, generating no structural deformation, and obtaining a tertiary stamping deformation piece, wherein the top fillet is 15 degrees; fig. 6 is a schematic diagram showing a side view cross-sectional structure of a workpiece machined by using the drawing deformation die CM-03.
S25: primary shape correction: after the third stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing the stamping die, adopting a wrinkle correction die CQ-01 to correct the stamping deformation piece, and correcting the whole shape of the curved surface of the screen, including the primary wrinkle correction, so as to obtain a quasi-finished stamping part with wrinkles; this accurate finished product stamping workpiece degree of depth is 3mm, and the top fillet is 15. Fig. 7 is a schematic side view of a cross-sectional structure of a work piece machined by using the wrinkle correction jig CQ-01.
S26: secondary shape correction and blanking: after primary shape correction, keeping the processing position of the quasi-finished product stamping part fixed, replacing a stamping die, performing secondary shape correction on the quasi-finished product stamping part by adopting a fold shape correction-cutting composite die CQ-02, performing final shape correction on the curved surface and the folds of the screen, and cutting the bottom of the finished product stamping part to form a circular flat end shell surface to obtain a finished product stamping part; the schematic side view cross-sectional structure of the work piece processed by using the wrinkle correcting and cutting compound die CQ-02 is shown in fig. 8, and the processed product is shown in fig. 9.
S27: and (3) testing a stamping sample: the shape and size of the curved surface, the folded curved surface and the micropores on the curved surface of the finished product stamping part are detected, and the requirements on the size and precision of the curved surface screen with folds on the surface are met.
S3: and (4) welding the folded curved screen cloth obtained in the S2 with a base through laser brazing to obtain the safety filter screen.
Detailed description of the invention
The embodiment provides a processing method of a safety filter screen with folds, the processing process is basically the same as that of the specific embodiment, and the difference is as follows: the femtosecond rotary cutting laser processing technological parameters are as follows: the technological parameters are as follows: wavelength 1030nm, repetition frequency 2000kHz, average power 15W, pulse width 443fs, scanning speed 260mm/s, laser mode TEM00, M2 1.119.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A combined processing method for a complex curved surface safety filter screen of an airplane hydraulic system is characterized in that a femtosecond laser rotary cutting technology is utilized to process a micro through hole array on a raw material plate; then, punching the plate with the micro through hole array by using a punching machine tool to form a curved screen structure with folds; and finally, cutting the end part of the curved screen, and welding a base through the cut end part to form the safe filter screen.
2. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 1, is characterized by comprising the following steps:
s1: mounting the selected stainless steel raw material plate on a femtosecond laser rotary cutting platform, carrying out micro-channel processing treatment, and obtaining a plate with micro through holes after the treatment is finished;
s2: taking down the processed plate with the micro through holes from the femtosecond laser rotary cutting platform, installing the plate on a punching machine tool for punching, cutting off the end part of the punched curved surface screen mesh structure with the wrinkled surface, and obtaining the curved surface screen mesh structure with the wrinkled surface;
s3: and welding a base at the cut end part by using laser brazing to obtain the safe filter screen.
3. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 2, wherein the specific process of step S1 is as follows:
s11: mounting the selected stainless steel plate raw material on a femtosecond laser rotary cutting platform;
s12: guiding the micropore pattern to be processed into a control computer of a femtosecond laser rotary cutting platform, and setting femtosecond processing technological parameters;
s13: starting a femtosecond laser rotary cutting processing platform, and forming a micro through hole array on a raw material plate according to a preloaded processing path to form a surface micro through hole plate;
s14: and taking down the surface micro-perforated plate after the processing is finished.
4. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 3, wherein the stainless steel plate raw material is subjected to the following treatment after being installed on a rotary cutting platform:
1) putting the plate into an ultrasonic cleaning machine, and cleaning for 1-3 min;
2) taking out the plate, wiping the surface moisture, putting the plate into a dryer, and drying the plate for 2-4 min at the temperature of 150-250 ℃;
3) and (5) drying, taking out the plate, and performing surface film pressing by using a film pressing machine.
5. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 4, wherein the material selected in the step 3) of pressing the membrane is PE.
6. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 3, wherein the process parameters in the step S12 are as follows: the wavelength is 1030nm, the repetition frequency is 1000 kHz-2000 kHz, the average power is 15-30W, the pulse width is 443fs, the scanning speed is 100-260 mm/s, and the laser mode TEM00 is adopted, wherein M2 is 1.119.
7. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 3, wherein the micro through hole array of step S13 is a rectangular or circular array.
8. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 2, wherein the stamping machining of the step S2 comprises the following steps:
s21: cutting and blanking: placing the plate at the processing position of a stamping machine tool, and cutting and blanking by adopting a cutting die to obtain a circular flat plate blank;
s22: primary stamping deformation: after cutting and blanking, keeping the processing position of the circular flat plate blank fixed, replacing a stamping die, carrying out primary stamping deformation on the circular flat plate blank by adopting a deep drawing deformation die CM-01, controlling the head of the screen to be formed, and obtaining a primary stamping deformation part by generating curved surface appearance deformation and not generating structural deformation in the process of forming the head of the screen;
s23: secondary stamping deformation: after the primary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out secondary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-02, controlling the wrinkle forming of the middle area of the screen, and obtaining a secondary stamping deformation piece without generating structural deformation due to the generation of curved surface appearance deformation in the wrinkle forming process of the middle area of the screen;
s24: and (3) third stamping deformation: after secondary stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, carrying out tertiary stamping deformation on the stamping deformation piece by adopting a deep drawing deformation die CM-03, controlling the formation of the bottom area of the screen, including fold extrusion forming, wherein the curved surface appearance deformation is generated in the forming process of the bottom area of the screen, the structural deformation is not generated, and the tertiary stamping deformation piece is obtained;
s25: primary shape correction: after the third stamping deformation, keeping the processing position of the stamping deformation piece fixed, replacing a stamping die, adopting a wrinkle correction die CQ-01 to correct the stamping deformation piece, and correcting the whole shape of the curved surface of the screen, including the primary wrinkle correction, so as to obtain a quasi-finished stamping part;
s26: secondary shape correction and blanking: after primary shape correction, keeping the processing position of the quasi-finished product stamping part fixed, replacing a stamping die, performing secondary shape correction on the quasi-finished product stamping part by adopting a fold shape correction-cutting composite die CQ-02, performing final shape correction on the curved surface and the folds of the screen, and cutting the bottom of the finished product stamping part to form a circular flat end shell surface to obtain a finished product stamping part;
s27: and (3) testing a stamping sample: the shape and size of the curved surface, the folded curved surface and the micropores on the curved surface of the finished product stamping part are detected, and the requirements on the size and precision of the curved surface screen with folds on the surface are met.
9. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 8, wherein the punching depth of one-time punching deformation is 1 mm; secondary stamping deformation is carried out, and the stamping depth is 2 mm; and (5) performing three-time stamping deformation, wherein the stamping depth is 3 mm.
10. The combined machining method for the complex-curved-surface safety filter screen of the aircraft hydraulic system as claimed in claim 8, wherein the top end fillet of the three-time stamping deformation piece obtained by the three-time stamping deformation is 15 degrees.
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| CN110479860A (en) * | 2018-05-15 | 2019-11-22 | 浙江优普生精密电子有限公司 | A kind of processing technology for measuring valve liner |
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