CN108817859A

CN108817859A - A kind of ultra-wide skin part sectional forming method

Info

Publication number: CN108817859A
Application number: CN201810682885.6A
Authority: CN
Inventors: 崔琳; 张钊; 韩艳彬; 周健
Original assignee: Xian Aircraft Industry Group Co Ltd
Current assignee: Xian Aircraft Industry Group Co Ltd
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2018-11-16

Abstract

The present invention provides a kind of ultra-wide skin part sectional forming methods, multiple sections, which are extracted, along covering length direction carries out curvature analysis, covering is divided into single-curvature region and hyperbolicity region, width is increased separately as stretch forming region in hyperbolicity region two sides, it is stretched using corresponding tooling, keep tangent with stretching die edge while covering is bonded with stretching die contact portion in drawing process, stretcher jaw and stretching transition region keeping parallelism.Part unformed area is subjected to roll forming, is extended outwardly by hyperbolicity region and single-curvature boundary between areasAs the start region of roll forming, roll forming is completed from inside to outside.The present invention makes full use of stretching transition region, makes a part of transition region as part by roll forming, so that stock utilization be made to be up to 90-93%.

Description

A kind of ultra-wide skin part sectional forming method

Technical field

The present invention relates to one kind in aircraft manufacturing technical field, after being especially segmented to ultra-wide skin part, uses A kind of manufacturing process of kinds of processes method combination forming.

Technical background

In aircraft industry, with the increase of aircraft load-carrying, the size of fuselage skin is also become larger.More and more machines Start a kind of length direction about 3000mm occur in type, width direction is more than the ultra-wide covering of 2000mm.Aluminium is commonly used on the market to close The width of golden plate material is 2200mm.Such part is often on the whole hyperbolicity covering, and middle section hyperbolic is larger, and both ends part is horizontal It is big to curvature, the process of stretch forming need to be used.

Commonly use the process of longitudinal stretching now to shape such part, but since covering width direction curvature is larger, and How trapezoidal after expansion, when stretching, narrow end needs to be stretched using special jaw, and needs to lengthen part and stretch transition Area is to eliminate the fold that jaw bending generates.By taking certain part as an example, the size of skin part is 2750mm × 2000mm, and longitudinal For woollen needed for stretching having a size of 6000mm × 2400mm, stock utilization is only 38.19%, is wasted very serious.According to normal Process stretching in the transverse direction, required woollen size 3100mm × 2980mm are advised, but this plate is difficult to purchase on the market, and takes It is long with expensive procurement cycle.

Summary of the invention

The present invention provides a kind of manufacturing process of segmented, be it is a kind of using manufacturing process stretching in the transverse direction to part into After row partial plastic forming, the manufacturing process of supplementary processing is carried out to part rest part using roll forming.

A kind of ultra-wide skin part sectional forming method, includes the following steps

1, which extracts multiple sections along covering length direction, carries out curvature analysis, obtains the curvature distribution section of different cross section, according to Covering is divided into single-curvature region and hyperbolicity region by the distribution of curvature distribution section, and the principle of single-curvature region division is：The division principle of hyperbolicity is：A is section highest point and part in formula The distance of the place straight line of two-end-point.L distance between two-end-point on section；On hyperbolicity region base, two sides increase respectively Degree of widening isSingle region, as stretch forming region, when S is roll forming the center of bottom roller away from.

2 stretch in the stretch forming region of covering using corresponding tooling, and guarantee round angle of stretching die is R >=15mm, While covering is bonded with stretching die contact portion in drawing process, transition region is stretched with stretching die edge and keeps tangent, is stretched Machine jaw and stretching transition region keeping parallelism.

Part unformed area is carried out roll forming by 3, when roll bending, by hyperbolicity region and single-curvature boundary between areas Place extends outwardlyAs the start region of roll forming, roll forming is completed from inside to outside.

The advantage of the invention is that：

1. making full use of stretching transition region, a part of transition region as part is made by roll forming, to save material Material, stock utilization are up to 90 ~ 93%.

2. most of ultra-wide covering can be shaped using plate is commonly used on the market, part manufacturing expense is saved.

Detailed description of the invention

Fig. 1 ultra-wide covering typical part figure

Fig. 2 part curvature analyzes schematic diagram

Fig. 3 part length direction schematic cross-section

Fig. 4 stretch forming process schematic

Fig. 5 roll forming process schematic

Explanation is numbered in figure：1. single-curvature region；2. hyperbolicity region；3. stretching die；4. stretcher jaw；5. stretching Cross area；6. covering and stretching die and contact portion；Roller bearing on 7.；8. lower roller bearing；9. start region；10. backing plate.

Specific embodiment

A kind of ultra-wide covering combination forming method of embodiment

Ultra-wide covering (Fig. 1) part size 2750mm × 2000mm, using woollen ruler needed for the method for the present invention formation of parts The very little conventional aluminium sheet for 3000mm × 2200mm.It is as follows using method of the invention：

1. extracting multiple sections along covering length direction carries out curvature analysis (Fig. 2), the curvature distribution of different cross section is obtained Section.According to the distribution of curvature distribution section, covering is divided into single-curvature region 1, hyperbolicity region 2.When dividing region, in hyperbolic On rate region base, two sides increase separately width and areSingle-curvature region, as stretch forming region, when S is roll forming The center of bottom roller is away from (Fig. 5), to eliminate straightway caused by subsequent roll forming process.

Single-curvature region 1 divide principle be：The division principle in hyperbolicity region 2 is：A is section highest point at a distance from straight line where part two-end-point in formula.L is two-end-point on section Between distance (Fig. 3).

2. the stretch forming region of covering is stretched using corresponding tooling, guarantee stretching die 3 fillet be R >= 15mm.When stretch forming, by woollen clamping to stretching die 3, after stretcher jaw 4 steps up woollen, part is stretched, While guaranteeing that covering is bonded with stretching die contact portion 6 in drawing process, it need to make to stretch transition region 5 and 3 edge of stretching die is protected Hold tangent, stretcher jaw 4 and stretching 5 keeping parallelism of transition region.

3. part unformed area 7 is carried out roll forming (Fig. 5).By adjust between upper roller bearing 7 and lower roller bearing 8 away from From adjustment forming curvature.When roll bending, extended outwardly by hyperbolicity region and single-curvature boundary between areasAs roll bending at The start region 9 of shape, is processed from inside to outside, while eliminating the edge line that roll bending technique generates using the method for bed course plate 10 Section.After roll forming, jaw retained part when stretching and part redundance are cut off.

The present invention is first to carry out curvature analysis to part, and covering is divided into different curvature section, then that hyperbolicity is biggish The stretch forming of type face retains and stretches transition region, then by transition region and unfashioned smaller hyperbolicity part or single-curvature part into Row roll forming.

Claims

1. a kind of ultra-wide skin part sectional forming method, it is characterised in that include the following steps：

Step 1 extracts multiple sections along covering length direction and carries out curvature analysis, obtains the curvature distribution section of different cross section, according to Covering is divided into single-curvature region and hyperbolicity region by the distribution of curvature distribution section, and the principle of single-curvature region division is：The division principle of hyperbolicity is：A is section highest point and part in formula The distance of the place straight line of two-end-point.L distance between two-end-point on section；On hyperbolicity region base, two sides increase respectively Degree of widening isSingle region, as stretch forming region, when S is roll forming the center of bottom roller away from；

Step 2 stretches in the stretch forming region of covering using corresponding tooling, and guarantee round angle of stretching die is R >=15mm, While covering is bonded with stretching die contact portion in drawing process, transition region is stretched with stretching die edge and keeps tangent, is stretched Machine jaw and stretching transition region keeping parallelism；

Part unformed area is carried out roll forming by step 3, when roll bending, by hyperbolicity region and single-curvature boundary between areas Place extends outwardlyAs the start region of roll forming, roll forming is completed from inside to outside.