CN104588474A - Skin part longitudinal stretching woolen size determination method - Google Patents
Skin part longitudinal stretching woolen size determination method Download PDFInfo
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- CN104588474A CN104588474A CN201410687689.XA CN201410687689A CN104588474A CN 104588474 A CN104588474 A CN 104588474A CN 201410687689 A CN201410687689 A CN 201410687689A CN 104588474 A CN104588474 A CN 104588474A
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- CN
- China
- Prior art keywords
- size
- woollen
- woolen
- section
- length
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
Abstract
The invention relates to the field of aerospace manufacturing, in particular to a skin part longitudinal stretching woolen size determination method. The method comprises the steps that 1, the composition of stretching woolen is analyzed, in the skin longitudinal stretching process, the situation that the woolen wraps a mold is analyzed, the woolen is divided into a part zone, a mold allowance, a suspending section, a clamping section and a clamping guiding section according to the contact between the woolen and the mold and a clamp, and the size of the woolen should be obtained by overlaying the sections; 2, the part size range is obtained through the method for calculating the longitudinal and transverse part length; 3, the woolen size is calculated and is composed of the part unfolding length, the allowance, the suspending section and the length of the clamp. According to the skin part longitudinal stretching woolen size determination method, material waste can be reduced, the woolen size design better adapts to the stretching technological process, and the phenomenon that the longitudinal stretching difficulty is increased due to the poor woolen size is avoided.
Description
Technical field
The present invention relates to Field of Aviation Manufacturing, be specifically related to a kind of skin part longitudinally pull-shaped woollen method for determining size.
Background technology
Skin part is the appearance part forming and maintain Aerodynamic Configuration of Aireraft.Stretch forming (being called for short pull-shaped) is a kind of process having the coated shaping of mould, is one of main forming mode of aircraft skin class part forming.Pull-shapedly the both sides of woollen to be clamped by equipment clamp, utilize the motion of mould and clamp, make that woollen produces uneven stretcher strain and coating mould makes woollen and mould fit.
Pull-shaped is cover dermatoplastic major processes, and skinning surface technology weighs the important symbol of aircraft manufacturing capability and qualification.The manufacture level of skin part directly represent the level that aviation reaches.Along with improving constantly new-type opportunity of combat performance requirement, the complexity of aircraft skin part also constantly increases, and shaping difficulty also increases much accordingly.Therefore the manufacturing technology improved and develop covering has profound significance.
In order to improve the manufacture level of covering class part, domestic aeronautical manufacture factory has introduced external advanced numerical control skinning surface machine one after another.Aborning, the design of pull-shaped mould and the determination of pull-shaped technological parameter, what substantially still rely on is the experience of technical staff and direct labor, die design process and part trial-manufacturing process blindness are very large, and this traditional " empirical " examination mode of drawing makes the waste of the production trial-manufacturing process material of skin part still more serious.
Summary of the invention
The object of the invention is to solve the problem, a kind of skin part longitudinally pull-shaped woollen method for determining size is provided.
In order to realize object of the present invention, the technical solution used in the present invention is:
A kind of skin part longitudinally pull-shaped woollen method for determining size, its step is as follows:
Step one: analyze pull-shaped woollen composition, longitudinally be pulled through in journey to covering, the situation of woollen coating mould is analyzed, woollen according to the contacting to be divided into and paste mould section, unsettled section and gripping section of mould and clamp, and paste mould section and can be divided into as the part zone within the scope of accessory size and mould surplus, gripping section can be divided into again clamp section and clamping guide section, and the size of woollen should be carried out superposition by these segmentations above and be obtained;
Step 2: obtain accessory size scope, by the analysis of step one, it be obtained by increasing other process allowance by the size of part that covering indulges the woollen size of drawing, before needing to calculate woollen size, the size range of part should be obtained, by calculating the method for part vertical and horizontal length, obtain the size range of part;
Step 3: calculate woollen size, the size of woollen should by part length of run, surplus, unsettled section, clamp length forms, part length of run is obtained by the accessory size computational methods in step 2, and surplus is that part launches the distance of rear sideline to part terminated line.
Beneficial effect of the present invention is: can reduce waste of material, and makes woollen size design more meet pull-shaped technical process, and avoiding, because bad woollen size, increases the vertical difficulty pulling into shape.
Accompanying drawing explanation
Fig. 1 is skinning surface schematic diagram,
Fig. 2 is shaping plate net shape figure,
Fig. 3 is shaping plate horizontal and vertical cross section line chart,
Fig. 4 is woollen size pie graph,
Fig. 5 is the determination figure of unsettled section of size in woollen.
Symbol description is as follows:
l before: die face is near the section line length of Y-axis forward
l after: die face is near the section line length of Y-axis negative sense
l left: die face is near the section line length of X-axis negative sense
l right: die face is near the section line length of X-axis forward
l p: accessory size length
w p: accessory size width
b: part both sides surplus
a: suspended length
e: clamp clamping length
f: the spacing of the jaw string of a musical instrument and arc radius
f: jaw clamps the spacing caused
δ: the design percentage elongation of stretch forming length direction
l bL : final woollen length
w bL : final woollen width.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described:
Embodiment: see Fig. 1 to Fig. 5.
A kind of skin part longitudinally pull-shaped woollen method for determining size, its step is as follows:
Step 1 analyzes pull-shaped woollen composition,
As shown in Figure 1.First woollen is clamped on the clamp of equipment.Woollen is clamped on pull-shaped equipment so that certain coated angle is manual.Prestretching and coated stretching afterwards.Sometimes also need to continue to increase wrap angle, strengthen the plastic deformation of woollen simultaneously further, make woollen paste mould fully.Last when wrap angle is substantially constant, then woollen is stretched, this is called that benefit is drawn.Last coated stretching and benefit are drawn and are also referred to as benefit and draw.In the process of skinning surface, determine part limit point, along the horizontal and vertical cutting woollen of part limit point, and then obtain the net shape of part.
As can be seen from Fig. 1 and Fig. 2, woollen according to the contacting to be divided into and paste mould section, unsettled section and gripping section of mould and clamp.And paste mould section and can be divided into as the part zone within the scope of accessory size and mould surplus, gripping section can be divided into again gripping section and clamping guide section.The size of woollen should be carried out superposition by these segmentations above and be obtained.
Step 2 obtains accessory size scope
Skinning surface mould is made up of part profile and secondary surface, part profile be by the curved surface of part carry out technique supplement form.Be marked with the cut-off rule of part at mould, in order to determine the size range of part, this method, by arranging cutting plane at pull-shaped vertical and horizontal, by the section line length that plane is crossing with part profile, calculates the size range of part, as shown in Figure 3.By the vertical and horizontal of part profile, before a mold, rear, left and right four direction has four section lines, counts respectively
l before,
l after,
l left,
l right.Then the rectangular dimension of constituent part size range is calculated as follows:
Step 3: calculate woollen size
As shown in Figure 4.Described determination woollen size is by part length of run
, surplus
b, unsettled section
a, clamp length
ecomposition, its formula is as follows:
Wherein, part length of run is obtained by the accessory size computational methods in step 2.Surplus
bfor part launches the distance of rear sideline to part terminated line, its length range should between 30-50mm according to illiteracy drawing-die tool design specification.
efor clamp length, the jaw clamping length of equipment clamp is drawn to determine according to vertical.
Suspended length
acomputational methods as shown in Figure 5.Because jaw clamps the corner cut of the 2o caused, clamping is caused
fspacing.And the spacing of the jaw string of a musical instrument and arc radius is
f.Under normal circumstances,
fwith
fnumerical value determined have for the longitudinal skinning surface machine of ACB FEL by equipment characteristic:
Then the computational methods of unsettled section of size are as follows:
Above-mentioned computational process does not consider the impact of material extending amount, and suppose that material is in longitudinal Stretch Forming Process, the percentage elongation of whole length direction is
δ, then final woollen size should be defined as:
Embodiments of the invention announce be one of preferred embodiment also; but be not limited thereto; those of ordinary skill in the art; very easily according to above-described embodiment; understand spirit of the present invention; and make different amplifications and change, but only otherwise depart from spirit of the present invention, all in protection scope of the present invention.
Claims (1)
1. a skin part longitudinally pull-shaped woollen method for determining size, its characterization step is as follows:
Step one: analyze pull-shaped woollen composition, longitudinally be pulled through in journey to covering, the situation of woollen coating mould is analyzed, woollen according to the contacting to be divided into and paste mould section, unsettled section and clamp section of mould and clamp, and paste mould section and can be divided into as the part zone within the scope of accessory size and mould surplus, clamp section can be divided into again gripping section and clamping guide section, and the size of woollen should be carried out superposition by these segmentations above and be obtained;
Step 2: obtain accessory size scope, by the analysis of step one, it be obtained by increasing other process allowance by the size of part that covering indulges the woollen size of drawing, before needing to calculate woollen size, the size range of part should be obtained, by calculating the method for part vertical and horizontal length, obtain the size range of part;
Step 3: calculate woollen size, the size of woollen should by part length of run, surplus, unsettled section, clamp length forms, part length of run is obtained by the accessory size computational methods in step 2, and surplus is that part launches the distance of rear sideline to part terminated line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687689.XA CN104588474A (en) | 2014-11-26 | 2014-11-26 | Skin part longitudinal stretching woolen size determination method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687689.XA CN104588474A (en) | 2014-11-26 | 2014-11-26 | Skin part longitudinal stretching woolen size determination method |
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| Publication Number | Publication Date |
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| CN104588474A true CN104588474A (en) | 2015-05-06 |
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| CN201410687689.XA Pending CN104588474A (en) | 2014-11-26 | 2014-11-26 | Skin part longitudinal stretching woolen size determination method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971975A (en) * | 2015-07-15 | 2015-10-14 | 江西洪都航空工业集团有限责任公司 | Skin forming technology combining stretching and stamping |
| CN108971355A (en) * | 2018-08-09 | 2018-12-11 | 南京航空航天大学 | The corrugated method of large curved surface covering is eliminated based on gradual change gap mold |
| CN110695180A (en) * | 2019-10-08 | 2020-01-17 | 江西洪都航空工业集团有限责任公司 | Large aircraft skin blank structure and skin stretch forming method |
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| US5463558A (en) * | 1994-02-04 | 1995-10-31 | Ford Motor Company | Method for designing a binder ring surface for a sheet metal part |
| CN101650756A (en) * | 2009-08-26 | 2010-02-17 | 成都飞机工业（集团）有限责任公司 | Skinning method of multi-point forming plane |
| CN101890453A (en) * | 2010-07-19 | 2010-11-24 | 哈尔滨飞机工业集团有限责任公司 | Method and die for molding skins front edges of rotary wings of aircraft by stretching and compressing |
| CN101987335A (en) * | 2009-07-30 | 2011-03-23 | 中国商用飞机有限责任公司 | Wingtip cover mirror face part drawing processing method |
| CN103272909A (en) * | 2013-06-14 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Forming method capable of guaranteeing quality of chemically-milled thick skin workpieces |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5463558A (en) * | 1994-02-04 | 1995-10-31 | Ford Motor Company | Method for designing a binder ring surface for a sheet metal part |
| CN101987335A (en) * | 2009-07-30 | 2011-03-23 | 中国商用飞机有限责任公司 | Wingtip cover mirror face part drawing processing method |
| CN101650756A (en) * | 2009-08-26 | 2010-02-17 | 成都飞机工业（集团）有限责任公司 | Skinning method of multi-point forming plane |
| CN101890453A (en) * | 2010-07-19 | 2010-11-24 | 哈尔滨飞机工业集团有限责任公司 | Method and die for molding skins front edges of rotary wings of aircraft by stretching and compressing |
| CN103272909A (en) * | 2013-06-14 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Forming method capable of guaranteeing quality of chemically-milled thick skin workpieces |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971975A (en) * | 2015-07-15 | 2015-10-14 | 江西洪都航空工业集团有限责任公司 | Skin forming technology combining stretching and stamping |
| CN104971975B (en) * | 2015-07-15 | 2017-07-21 | 江西洪都航空工业集团有限责任公司 | It is a kind of to stretch the covering forming technology being combined with punching press |
| CN108971355A (en) * | 2018-08-09 | 2018-12-11 | 南京航空航天大学 | The corrugated method of large curved surface covering is eliminated based on gradual change gap mold |
| CN108971355B (en) * | 2018-08-09 | 2019-12-13 | 南京航空航天大学 | method for eliminating wrinkling of large-curved-surface skin based on gradual-change gap mold |
| CN110695180A (en) * | 2019-10-08 | 2020-01-17 | 江西洪都航空工业集团有限责任公司 | Large aircraft skin blank structure and skin stretch forming method |
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Application publication date: 20150506 |