CN115488581A - Method for accurately manufacturing double-curvature stringer - Google Patents
Method for accurately manufacturing double-curvature stringer Download PDFInfo
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- CN115488581A CN115488581A CN202211205787.6A CN202211205787A CN115488581A CN 115488581 A CN115488581 A CN 115488581A CN 202211205787 A CN202211205787 A CN 202211205787A CN 115488581 A CN115488581 A CN 115488581A
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- stringer
- curvature
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- scribing
- block
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003672 processing method Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007665 sagging Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 8
- 238000007689 inspection Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 1
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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
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
Abstract
The invention discloses a method for accurately manufacturing a double-curvature stringer. Sinking the double-curvature stringer subjected to profile forming; the processing method comprises the following steps: a. marking a first sunken processing position of the stringer by taking the head end of the stringer as a positioning reference, stamping the first sunken stringer according to the marking, and detecting the sunken stringer subjected to stamping by using a die mould surface (1) after the stamping is finished; b. repeating the step a to complete the punching processing of the remaining stringer sink; c. after all the stringer sag processing is completed, the length allowance at the other end is cut off by taking the head end of the stringer as a reference. The invention has the characteristics of high forming precision, stable quality, high production efficiency, strong universality and easy operation.
Description
Technical Field
The invention belongs to the technical field of plastic forming, and particularly relates to a method for accurately manufacturing a double-curvature stringer.
Background
The existing manufacturing and inspection of the double-curvature stringer part adopts a mode of inspecting a bracket template (see figure 1), the shape and the direction of the stringer part are controlled by inspecting the line contact between the bracket template and the stringer part at a frame position, the sinking position is determined by drawing a line according to the size of a drawing line according to the inspection bracket template, the whole shape curved surface and the direction of the stringer part cannot be accurately controlled, only the shape and the direction of the stringer part at the frame position can be controlled, the joint gap between the outer shape of the stringer part and a skin and the deviation of the sinking position on an assembly type frame are large in the assembly process (see figure 2), the part repair cannot be caused due to the assembly requirement, the assembly period and the assembly quality are influenced, and the double-curvature stringer part is required to be improved in order to solve the problems of poor manufacturing precision and high repair rate of the double-curvature stringer part of a large airplane.
Disclosure of Invention
The purpose of the invention is: a method of accurately manufacturing a doubly curved stringer is provided. The invention has the characteristics of high forming precision, stable quality, high production efficiency, strong universality and easy operation.
The technical scheme of the invention is as follows: an accurate manufacturing method of a double-curvature stringer is used for sinking and processing the double-curvature stringer which is subjected to profile forming; the processing method comprises the following steps:
a. marking the first sunken processing position of the stringer by taking the head end of the stringer as a positioning reference, stamping the first sunken part of the stringer according to the marking, and detecting the sunken part of the stamped stringer by using a die mould surface after the stamping;
b. repeating the step a to complete the punching processing of the remaining stringer sink;
c. after all the stringer sinking processing is completed, the length allowance of the other end is cut off by taking the head end of the stringer as a reference.
In step a of the method for precisely manufacturing the double-curvature stringer, the positioning reference of the head end of the stringer is determined by the positioning abutment block positioned on one side of the molding surface of the mold.
In step a of the foregoing method of accurately manufacturing a dual camber stringer, the stringer sag is detected as: and (4) comparing the double-curvature stringer processed with stringer sag with a sag detection line on the mould tire profile.
In the step c of the method for precisely manufacturing the double-curvature stringer, the length allowance of the other end of the double-curvature stringer is cut off, and the scribing block arranged on the molded surface of the mold blank is used for scribing and then cutting off according to the scribing line.
In the method for accurately manufacturing the double-curvature stringer, the stringer passing groove is reserved at the bottom of the scribing block, and the stringer passing groove is formed in the outline of the outer end of the stringer to form an end head allowance removing line.
In the foregoing method for precisely manufacturing a double-curvature stringer, the scribing process of the scribing master block is as follows: after one end of the double-curvature stringer is positioned by using the positioning leaning block, the other end of the double-curvature stringer penetrates through a stringer through groove reserved at the bottom of the scribing leaning block, the double-curvature stringer is attached, scribing is carried out along an end head allowance removing line formed by the stringer through a contour line at the outer end of the groove, and then the beveling angle and the notch position of the end head of the double-curvature stringer are determined.
In the method for precisely manufacturing the double-curvature stringer, the scribing leaning block is positioned on the molded surface of the mold tyre through a pin.
In the above-described method for precisely manufacturing a double-curved stringer, when the working position of the sagging of the stringer is scribed, the position of the scribed line in the longitudinal direction is compensated for according to the following table,
| sinking depth (mm) | Offset (mm) |
| Less than 1.0 | 0.1 |
| 1.0-1.5 | 0.2 |
| 1.5-2.5 | 0.25 |
| Greater than 2.5 | 0.3 |
。
The invention has the advantages that: compared with the prior art, the method can ensure the accurate manufacture of the aviation stringer parts; the aviation stringer reduces the influence of human factors of operators on the product quality and improves the stability of the product quality through the detachable end positioning block; the method is suitable for manufacturing all aviation double-curvature stringer parts and has strong universality.
According to the method, the problems existing in the manufacturing, inspection and assembly processes of the double-curvature stringer part according to the inspection bracket template are analyzed, the phenomena that the manufacturing reference and the assembly reference of the stringer part are not uniform, the scribing of the stringer end and the cutting control of the machining allowance are not accurate, the deviation of the sinking forming position is large, the tire pasting gap is large and the like are main reasons of high rework and rework rates and unstable quality of the part caused by the common problems that the length, the curvature and the lower limit position error of the part are large, the fitting degree of the stringer part and the skin is not high and the like in the assembly process of the double-curvature stringer part. In order to solve the problem, the invention improves the manufacturing process of the double-curvature stringer part as follows:
(1) Unified part manufacturing reference and assembly reference
When parts are manufactured, the stringer end and the sinking forming datum are unified and kept consistent with the assembly positioning datum, the aim of changing sinking position positioning of the stringer into end positioning is achieved, and error accumulation caused by inconsistency of the part manufacturing and assembly positioning datum is reduced;
(2) Cutting to control stringer end scoring and finishing allowance
By controlling the size of the stringer end (assembling and positioning reference end), a positioning leaning block (shown in figures 3 and 4) is added on an inspection die (a moulding surface of a moulding bed) of the stringer, so that the accuracy and consistency of the assembling and positioning end are ensured; meanwhile, a scribing backup block (see figures 3, 5 and 6) is designed, and accurate control of cutting and scribing of the stringer end is achieved.
(3) Controlling the sinking forming position degree
Sinking is respectively formed by drawing lines, so that the position deviation caused by material shrinkage during sinking stamping forming is reduced, meanwhile, the process method is improved, the sinking forming is carried out after the stringer parts are finished with the shape forming, the sinking forming is carried out by drawing lines by taking the assembly reference end as a reference, and the sinking relative position is ensured to be consistent with the assembly requirement; when the stringer has 2 or more sags, the lines are respectively drawn to form the stringer (namely, the lines are drawn to form the next sag after the first sag is formed), and the accuracy of the relative position between the sags is ensured.
Specific technical effects referring to fig. 7-10, it can be seen from fig. 7 that: before implementation: the deviation of the manufactured appearance of the part reaches 15mm. After the implementation: the deviation of the appearance of the manufactured part can be controlled within 0.4mm, and the effect is obvious; as can be seen from fig. 8 and 9, before implementation: the maximum tire pasting gap reaches 5mm, and the attaching degree of the stringer part and the skin is low. After the implementation: the tire pasting gap is smaller than 0.4mm, and the fitting degree of the stringer part and the skin is obviously improved. As can be seen from fig. 10, the parts manufactured by the present invention have small variations in the length direction.
In conclusion, the invention has the advantages that through the improvement measures of unifying the manufacturing and assembling standards of the parts, accurately controlling the drawing of the stringer end and the cutting of the machining allowance, controlling the sinking forming position degree and the like, the problems of large deviation of the appearance and sinking position of the double-curvature stringer part, low fitting degree with a skin and the like are obviously improved, the accurate manufacturing of the double-curvature stringer part is realized, the workload of part-mounted on-site milling and repairing is reduced, the repair rate of the double-curvature stringer part is reduced by more than 90%, the assembling quality of the part is effectively improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of a conventional dual camber stringer part manufacturing and inspection process;
FIG. 2 is a schematic illustration of a problem with conventional dual camber stringer component fabrication;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is an enlarged schematic view of FIG. 3 at I;
FIG. 5 is an enlarged view of the second portion of FIG. 3;
FIG. 6 is a schematic view of a scribe block configuration;
FIG. 7 is a comparison of profile deviations on tooling for stringer components after implementation of the present invention and conventional methods;
FIG. 8 is a comparison of tire fit clearance of stringer components on a mold tire after practicing the present invention and conventional methods;
FIG. 9 is a comparison of the fit of stringer components to the skin after the practice of the present invention and conventional methods;
FIG. 10 is a comparison of the length variation of stringer components on a mold bed after practicing the present invention and conventional methods.
Wherein: 1-mould tyre profile, 2-positioning leaning block, 3-marking leaning block, 4-stringer passing groove, 5-end allowance removing line, 6-pin, 7-double curvature stringer and 8-sinking detection line.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example 1. An accurate manufacturing method of a double-curvature stringer is disclosed, and referring to fig. 3-6, sinking processing is carried out on a double-curvature stringer 7 which is subjected to profile forming; the processing method comprises the following steps:
a. marking the first sunken processing position of the stringer by taking the head end of the stringer as a positioning reference, stamping the first sunken part of the stringer according to the marking, and detecting the sunken part of the stamped stringer by using the molded surface 1 of the die; when parts are manufactured, the stringer end and the sinking forming datum are unified and kept consistent with the assembly positioning datum, the aim of changing sinking position positioning of the stringer into end positioning is achieved, and error accumulation caused by inconsistency of the part manufacturing and assembly positioning datum is reduced;
b. repeating the step a to complete the stamping processing of the remaining stringer sink; through the steps a and b, respectively drawing lines for sinking to form, reducing the position deviation caused by material shrinkage during sinking stamping forming, simultaneously improving the process method, determining that the stringer parts are subjected to sinking forming after finishing appearance forming, and drawing lines for forming by taking the assembly reference end as a reference during sinking forming to ensure that the relative position of sinking is consistent with the assembly requirement; when the stringer has 2 or more sags, the stringer is respectively drawn and respectively formed (namely, the stringer is drawn to form the next sag after the stringer is formed and the first sag is formed), and the accuracy of the relative position between the sags is ensured.
c. After all the stringer sinking processing is completed, the length allowance of the other end is cut off by taking the head end of the stringer as a reference. By controlling the size of the assembling and positioning reference end of the stringer end, a positioning leaning block (shown in figure 3) is added on an inspection die (a moulding surface of a moulding bed) of the stringer, so that the accuracy and consistency of the assembling and positioning end are ensured; meanwhile, the scribing backup block 3 is designed, and accurate control of cutting and scribing of the stringer end is achieved.
In the step a, the positioning reference determination of the stringer head end is completed by a positioning leaning block 2 positioned on one side of the mould molding surface 1.
In step a, detecting the stringer sag comprises: and (3) comparing the double-curvature stringer processed with stringer sag with a sag detection line 8 on the mould tire profile 1.
And c, cutting off the length allowance at the other end of the double-curvature stringer, and cutting off the double-curvature stringer according to the scribing line after scribing by using the scribing leaning block 3 arranged on the molded surface 1 of the mold.
The bottom of the scribing block 3 is reserved with a stringer through groove 4, and the outer end contour line of the stringer through groove 4 forms an end allowance removal line 5.
The scribing process of the scribing block 3 is as follows: after one end of the double-curvature stringer is positioned by the positioning leaning block 2, the other end of the double-curvature stringer passes through the stringer passing groove 4 reserved at the bottom of the scribing leaning block 3, the double-curvature stringer is attached, and scribing is carried out along an end head allowance removing line 5 formed by the outline of the outer end of the stringer passing groove 4 at the moment, so that the beveling angle and the notch position of the end head of the double-curvature stringer are determined.
The aforementioned scribe block 3 is positioned on the mould tread surface 1 by means of a pin 6.
In the step a, when the processing position of the long purlin sinking is scribed, the position of the scribed line in the length direction is compensated according to the following table,
| sinking depth (mm) | Offset (mm) |
| Less than 1.0 | 0.1 |
| 1.0-1.5 | 0.2 |
| 1.5-2.5 | 0.25 |
| Greater than 2.5 | 0.3 |
。
Claims (8)
1. An accurate manufacturing method of a double-curvature stringer is characterized in that the double-curvature stringer which is subjected to profile forming is subjected to sinking processing; the processing method comprises the following steps:
a. marking a first sunken processing position of the stringer by taking the head end of the stringer as a positioning reference, stamping the first sunken stringer according to the marking, and detecting the sunken stringer subjected to stamping by using a die mould surface (1) after the stamping is finished;
b. repeating the step a to complete the stamping processing of the remaining stringer sink;
c. after all the stringer sinking processing is completed, the length allowance of the other end is cut off by taking the head end of the stringer as a reference.
2. The method of claim 1, wherein the determination of the stringer head end reference in step a is made by a positioning block (2) on one side of the mold surface (1).
3. The method of accurately fabricating the doubly curved stringer of claim 1, wherein in step a, the stringer sag is detected as: and (3) comparing the double-curvature stringer processed with stringer sag with a sag detection line on the mould tire profile (1).
4. The method of claim 1, wherein in step c, the length of the other end of the double-curvature stringer is cut off, and the double-curvature stringer is scribed by the scribing block (3) on the mold surface (1).
5. The method for precisely manufacturing the double-curvature stringer according to claim 4, wherein the stringer passing groove (4) is reserved at the bottom of the scribing block (3), and the outer end contour line of the stringer passing groove (4) forms an end margin removing line (5).
6. The method for precisely manufacturing the double-curvature stringer according to claim 5, wherein the scribing of the scribing block (3) is performed as follows: after one end of the double-curvature stringer is positioned by the positioning leaning block (2), the other end of the double-curvature stringer penetrates through the stringer through groove (4) reserved at the bottom of the scribing leaning block (3), the double-curvature stringer is attached, and scribing is carried out along an end allowance removing line (5) formed by an outer end contour line of the stringer through groove (4), so that the beveling angle and the notch position of the end of the double-curvature stringer are determined.
7. The method of accurately manufacturing a dual-curvature stringer according to claim 5, wherein the scribe block (3) is positioned on the mold surface (1) by a pin (6).
8. The method of claim 1, wherein the position of the scribed line in the longitudinal direction is compensated for when scribing the working position of the stringer sagging in step a,
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211205787.6A CN115488581A (en) | 2022-09-30 | 2022-09-30 | Method for accurately manufacturing double-curvature stringer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211205787.6A CN115488581A (en) | 2022-09-30 | 2022-09-30 | Method for accurately manufacturing double-curvature stringer |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103846698A (en) * | 2014-03-17 | 2014-06-11 | 沈阳飞机工业（集团）有限公司 | Composite material long purlin milling flexible tool and clamping method of same |
| CN103900520A (en) * | 2014-03-28 | 2014-07-02 | 西北工业大学 | Method for detecting geometric dimension of integral wall panel slab model |
| CN210590113U (en) * | 2019-09-19 | 2020-05-22 | 常州新创航空科技有限公司 | Hat-shaped stringer lower die |
| CN111267370A (en) * | 2020-03-16 | 2020-06-12 | 沈阳飞机工业（集团）有限公司 | Manufacturing method of combined uniform-pressure cover plate for omega stringer stiffened composite wallboard |
| CN112122465A (en) * | 2020-09-11 | 2020-12-25 | 天津航天长征火箭制造有限公司 | Self-resistance heating forming method for hard aluminum alloy section sinking structure |
| CN213672017U (en) * | 2020-11-19 | 2021-07-13 | 西安泽达航空制造有限责任公司 | A stringer frock for aircraft manufacturing |
| CN213703418U (en) * | 2020-06-12 | 2021-07-16 | 陕西飞机工业（集团）有限公司 | Z-shaped stringer end head beveling and scribing device |
| CN113983894A (en) * | 2021-10-12 | 2022-01-28 | 江西洪都航空工业集团有限责任公司 | Preparation method of aviation long-narrow-belt flange type stringer part checking fixture |
| CN114192695A (en) * | 2021-11-03 | 2022-03-18 | 哈尔滨飞机工业集团有限责任公司 | Combined stretch bending forming method for complex angle part |
-
2022
- 2022-09-30 CN CN202211205787.6A patent/CN115488581A/en active Pending
Patent Citations (9)
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|---|---|---|---|---|
| CN103846698A (en) * | 2014-03-17 | 2014-06-11 | 沈阳飞机工业（集团）有限公司 | Composite material long purlin milling flexible tool and clamping method of same |
| CN103900520A (en) * | 2014-03-28 | 2014-07-02 | 西北工业大学 | Method for detecting geometric dimension of integral wall panel slab model |
| CN210590113U (en) * | 2019-09-19 | 2020-05-22 | 常州新创航空科技有限公司 | Hat-shaped stringer lower die |
| CN111267370A (en) * | 2020-03-16 | 2020-06-12 | 沈阳飞机工业（集团）有限公司 | Manufacturing method of combined uniform-pressure cover plate for omega stringer stiffened composite wallboard |
| CN213703418U (en) * | 2020-06-12 | 2021-07-16 | 陕西飞机工业（集团）有限公司 | Z-shaped stringer end head beveling and scribing device |
| CN112122465A (en) * | 2020-09-11 | 2020-12-25 | 天津航天长征火箭制造有限公司 | Self-resistance heating forming method for hard aluminum alloy section sinking structure |
| CN213672017U (en) * | 2020-11-19 | 2021-07-13 | 西安泽达航空制造有限责任公司 | A stringer frock for aircraft manufacturing |
| CN113983894A (en) * | 2021-10-12 | 2022-01-28 | 江西洪都航空工业集团有限责任公司 | Preparation method of aviation long-narrow-belt flange type stringer part checking fixture |
| CN114192695A (en) * | 2021-11-03 | 2022-03-18 | 哈尔滨飞机工业集团有限责任公司 | Combined stretch bending forming method for complex angle part |
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|---|
| 张世昌: "机械制造技术基础", 31 August 2002, 天津大学出版社, pages: 199 * |
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