JP2003025021A - Plate-like work forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency and the working accuracy when performing the work of giving the curvature to a plate-like work by the shot- peening, and other works concurrently. SOLUTION: Before forming a compound-curved surface of an arbitrary shape by performing the shot-peening on the plate-like work 63t, the pre-working such as the work of forming a pocket 73 by the mechanical milling of the plate-like work 63t, the work of forming access holes to fit access panels 64, 65 and 66, and the work of trimming the outline of the plate-like work 63t is performed in advance. The pre-working can be performed when the plate-like work 63t is in a flat state without any curvature, the working is facilitated, the working accuracy is improved, and the working cost is reduced, and in addition, accuracy degradation of the palate-like work 63t by the post-working can be minimized by reducing the post-working which is performed after forming the plate-like work 63t.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a plate-like work by projecting a shot material onto the plate-like work to give a predetermined curvature.

[0002]

2. Description of the Related Art Pressing and rolling are methods for processing a plate-like work so as to give it a curvature. However, the pressing not only increases the cost of the die, but also promptly responds to changes in the curvature design. There is a problem that it is difficult. In addition, when the plate thickness of the plate-like work is partially changed or when an accessory such as a reinforcing rib is present, there is a problem that the pressing process requires a lot of man-hours and the rolling process cannot cope with the problem.

Therefore, a method of applying a curvature by projecting a shot material onto the surface of a plate-like work by a shot peening apparatus has been put into practical use. By adopting this method, an expensive press die is not required, and since it is possible to process even if there are accessories on the plate-like work, it is suitable for processing the outer plate of a small-volume aircraft. There is.

US Pat. No. 2,701,408 describes
It is described that while a plate-shaped work having an accessory is being conveyed in one direction, a shot material is projected from a plurality of shot peening devices arranged side by side in a direction orthogonal to the conveying direction.

Further, in US Pat. No. 4,329,862, a plate-shaped work is formed in order to form a multi-curved surface by giving a curvature in a span direction and a curvature in a cord direction to an outer plate of a main wing of an aircraft as a plate-shaped work. While carrying in one direction, from the shot peening equipment arranged on each of the two sides,
There is described one in which a shot material is projected with a predetermined peen strength.

Further, Japanese Patent Application Laid-Open No. 52-99961 discloses that
It describes that the projection condition of the shot material for giving a desired curvature to the plate-like work is obtained based on the result of measuring the residual stress of the test piece of the plate-like work.

[0007]

By the way, if a plate-shaped work is given a curvature by a shot peening apparatus and then the plate-shaped work having the curvature is subjected to mechanical milling to reduce the wall thickness, it is expensive. There is a problem that a 5-axis milling machine is required and the machining cost increases.
In order to avoid this, it is possible to carry out chemical milling to dissolve the surface of the plate-like work with chemicals to reduce the wall thickness, but chemical milling is a troublesome task of masking the parts that are not processed. However, there is a problem that processing time and processing cost increase.

In addition to the milling process, when post-processing such as punching and trimming after giving curvature to the plate-shaped work, positioning of the plate-shaped work having a curvature becomes difficult, and thus the post-processing is not performed. The accuracy may decrease, or the curvature given by the shot peening may change due to the influence of post-processing, and the processing accuracy of the plate-shaped work may decrease as a whole.

The present invention has been made in view of the above-mentioned circumstances, and when the processing for giving a curvature to the plate-like work by shot peening and the other processing are performed together, the processing efficiency and the processing accuracy are improved. The purpose is to enable.

[0010]

In order to achieve the above object, according to the invention described in claim 1, a method of forming a plate-like work by projecting a shot material onto the plate-like work to give a predetermined curvature. 1. In the step 1, a first step of performing pre-processing necessary for the plate-shaped work to function as a product after the forming is performed on the plate-shaped work before forming to give a predetermined curvature; A second step of projecting a shot material onto a work to give a predetermined curvature is proposed, and a method for forming a plate-like work is proposed.

According to the above configuration, before the shot material is projected to give the plate-like work a predetermined curvature, pre-processing required for the plate-like work to function as a product after the forming is performed in advance. Since the shot material is then projected onto the plate-like work to give a predetermined curvature, the pre-processing can be performed when the plate-like work is in a flat state with no curvature, which facilitates the processing. Not only can the processing accuracy be improved and the processing cost can be reduced, but also the post-processing performed after forming the plate-shaped work can be reduced to minimize the deterioration of the accuracy of the plate-shaped work due to the post-processing.

According to the invention described in claim 2,
In addition to the structure of claim 1, there is proposed a method for forming a plate-shaped work, wherein the plate-shaped work is a skin of a pylon that supports an aircraft engine.

According to the above construction, since the plate-like work is the skin of the pylon that supports the engine of the airplane, the skin having a large change in curvature can be formed without using an expensive mold. In addition, it is possible to easily cope with the design change of the curvature of the skin.

According to the invention described in claim 3,
In addition to the configuration of claim 1 or claim 2, there is proposed a method of forming a plate-shaped work, wherein the pre-processing is mechanical milling for reducing the weight of the plate-shaped work.

According to the above construction, when the plate-like work is in a flat state having no curvature, the machine milling as pre-processing is performed, so that an expensive 5-axis milling machine is not required and It becomes possible to perform milling with an inexpensive 3-axis milling machine without performing chemical milling, which is troublesome for masking work, and it is possible to contribute to reduction in machining cost.

The blade tip side skin 63t of the embodiment corresponds to the plate-like work of the present invention.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

1 to 16 show an embodiment of the present invention. FIG. 1 is a front view of a plate-shaped work forming apparatus, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3, FIG. 4 is an enlarged sectional view taken along line 4 of FIG. 3, FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4, FIG. 6 is a perspective view of an airplane, and FIG. FIG. 8 is a view from the arrow direction (a view showing the surface side of the wing tip side skin), FIG.
8 is a sectional view taken along the line 8 in FIG. 9, FIG. 9 is a sectional view taken along the line 9-9 in FIG. 7, FIG. 10 is a view showing the shape and radius of curvature of each processing region of the wing tip side skin, and FIG. 11 is a wing tip side skin corresponding to FIG. FIG. 12 is a diagram illustrating the back side of the plate, FIG. 12 is a diagram illustrating a method for measuring the peen strength, FIG. 13 is a graph showing the relationship between the position of a curved plate-shaped work and the arc height, and FIG. 14 is a plate having various plate thicknesses. FIG. 15 is a graph showing the relationship between the feed rate and the radius of curvature of the workpiece.
FIG. 16 is an operation explanatory view when processing the processing area TP4 of the blade tip side skin, and FIG. 16 is an operation explanatory view when processing the processing area TP6 of the blade tip side skin.

As shown in FIGS. 1 to 4, a plate-shaped work forming apparatus includes a pair of guide rails 12 fixed to the upper surface of base members 11 installed on the floor in the X-axis direction (left-right direction). 12 and these guide rails 12,
A plate-like first slide plate 14 is slidably supported by 12 via slide guides 13. A drive sprocket 16 that is rotated by a variable speed motor 15 as X-axis direction moving means is provided on one side of the first slide plate 14 in the X-axis direction, and a driven sprocket 17 is provided on the other side. The endless chain 18 wound around the drive sprocket 16 and the driven sprocket 17 is fixed to both left and right ends of the first slide plate 14. Therefore,
By controlling the number of rotations of the variable speed motor 15 by the control means U, the first slide plate 14 is moved to the guide rails 12, 1.
It is possible to move along X in the X-axis direction at an arbitrary speed.

Two guide rods 20, 20 extending in the Y-axis direction (front-back direction) are slidably supported by four guide members 19 ... Fixed to the upper surface of the first slide plate 14. Frame-shaped second slide plates 22 are supported on both ends of the guide rods 20, 20 via mounting brackets 21. A cylinder 23 as a Y-axis direction moving means is provided on the upper surface of the first slide plate 14, and an output rod 23a of the cylinder 23 is connected to a mounting member 24 provided on the lower surface of the second slide plate 22. Therefore, if the cylinder 23 is driven to expand and contract, the second
The slide plate 22 can move in the Y-axis direction along the guide rods 20, 20.

An elongated support plate 25 extending in the X-axis direction is fixed to the upper surface of the second slide plate 22, and two columns 26, 26 are erected on both left and right ends of this support plate. The upper and lower parts of the pillars 26, 26 are connected by connecting members 27, 28, respectively, and the lower ends of the pillars 26, 26 are fixed to the upper surface of the second slide plate 22 by a triangular reinforcing plate 29. Two guide rails 3 extending in the Z-axis direction (vertical direction) on the front surfaces of the two columns 26, 26.
0 and 30 are fixed, and these guide rails 3
A plate-shaped third slide plate 33 is slidably supported on the Nos. 0 and 30 via slide guides 31.

A pair of bearings 3 provided on the upper surface of the support plate 25.
A pair of drive sprockets 36, 36 are fixed to a drive shaft 35 supported by the guide rails 30, 3.
A pair of driven sprockets 39, 39 is fixed to a driven shaft 38 supported by a pair of bearings 37, 37 provided on the upper surface of 0, and the corresponding drive sprockets 36, 36 and the corresponding driven sprockets 39, 39 are respectively provided between them. The endless chains 40, 40 wound around are the third slide plate 33.
Is connected to the upper and lower ends of. Therefore, by rotating the drive shaft 35 with the motor 41 as the Z-direction moving means provided on the upper surface of the support plate 25, the third slide plate 33 is rotated.
Can move in the Z-axis direction along the guide rails 30, 30.

As can be seen by referring also to FIG.
A stepped rotary shaft 43 integrally provided on the rear surface of the work support plate 42 is fitted into a shaft hole 33a formed in the center of the front surface of the third slide plate 33, and is prevented from coming off by a circlip 44. A pair of arc holes 33b, 33b centering on the rotation shaft 43 and a plurality of pin holes 33c arranged on a pair of arcs centering on the rotation shaft 43 penetrate through the third slide plate 33, Further, the work support plate 42 has two bolt holes 42a, 42a sandwiching the rotary shaft 43.
And the two pin holes 42b, 42b sandwiching the rotary shaft 43 penetrate.

Therefore, the work supporting plate 42 is rotated about the rotation axis 43 by a desired angle, and the work supporting plate 42
Two pin holes 42b, two pins 45 passing through 42b,
45 to the third slide plate 33 with a plurality of pin holes 33c
When inserted in any of the two, the two bolts 46, 46 penetrating the two bolt holes 42a, 42a of the work support plate 42 and the two arc holes 33b, 33b of the third slide plate 33 are nuts. By concluding at 47, 47,
The work support plate 42 can be fixed at any rotation position around the Y axis. At this time, the collars 48, 48 fitted on the outer circumferences of the bolts 46, 46 are attached to the third slide plate 33.
The work supporting plate 42 can be held parallel to the slide plate 33 by interposing it between the work supporting plate 42.

The rotary shaft 43, the bolts 46, 46, the nuts 47, 47 and the pins 45, 45 are the work support plate 4
A Y-axis rotating means 49 for rotating and fixing 2 around the Y-axis is configured.

A wing tip side skin 63t (a skin material on the wing tip side of the pylon that supports the engine on the main wing of the airplane), which is a plate-like work to be machined, is superposed on the front surface of the work supporting plate 42, and their peripheral portions. Are fixed with a plurality of clips 50 .... In the embodiment, the work support plate 42 and the wing tip side skin 63 are provided to facilitate the fixation by the clips 50.
t has the same shape, but the work support plate 42 is
The size may be the same as that of the slide plate 33.
In this case, by constructing the work supporting plate 42 with a punching plate, the blade tip side skin 63t of an arbitrary shape can be bolted by utilizing the large number of punch holes.

A shot peening device 51 is arranged so as to face the front surface of the blade tip side skin 63t fixed to the work support plate 42. Shot peening machine 5
1 is, for example, a large number of shot materials made of steel balls having a diameter of 0.6 mm are supplied into the rotating impeller and projected in the Y-axis direction toward the blade tip side skin 63t by centrifugal force. The projection amount (weight of the shot material projected per unit time) and the projection speed can be arbitrarily adjusted.

As shown in FIG. 6, the left and right main wings 6 of the airplane
Pylons 63 and 63 that support the engines 62 and 62 on the upper surfaces of the blades 1 and 61 are blade tip side skins 63t located on the blade tip side.
And a blade root side skin 63r located on the blade root side.

FIG. 7 shows a wing tip side skin 63 of the right wing 61.
6 shows the surface side of t, and the six processing regions TP1, TP2, TP3, TP4 from the front edge side to the rear edge side,
While TP5 and TP6 are partitioned, one unprocessed region R0 is partitioned between the two processed regions TP5 and TP6. The wing tip side skin 63 is provided in the machining area TP1 on the most front edge side.
A front edge member 64 connecting t and the blade root side skin 63r is fixed, and this front edge member 64 is indicated as a region TP0.

As is apparent from FIGS. 8 and 9, the five processing regions TP1 and TP on the leading edge side of the wing tip side skin 63t are formed.
2, TP3, TP4, and TP5 are formed by a curved surface protruding toward the front surface, whereas the non-processed region R0 is formed by a flat surface, and the processed region TP6 closest to the trailing edge side is formed by a curved surface protruding toward the back surface side. Has been done. Since the non-processed region R0 is a flat surface, the curvature imparting process by shot peening is not performed. The blade root side skin 63r has a curvature only in the vicinity of the leading edge and in the vicinity of the trailing edge, and is generally flat as compared with the blade tip side skin 63t.

[0031]

[Table 1]

As is clear from referring to Table 1 and FIG. 10 together, seven regions TP1, TP2, TP3, TP
Three processing areas TP among 4, TP5, R0, and TP6
1, TP2, TP6 and one non-processed region R0 have a constant width in the longitudinal direction, but the other three processed regions TP3,
The widths of TP4 and TP5 change in the longitudinal direction. And three processing areas TP1 and TP having a constant width in the longitudinal direction.
2, TP6 and one non-machined region R0 have a constant radius of curvature in the longitudinal direction, while the other three machined regions TP3, TP4, TP5 whose width changes in the longitudinal direction have a radius of curvature. It changes in the longitudinal direction. Therefore, the shape of the blade tip side skin 63t is not a simple curved surface (single contour) but a double curved surface (double contour).

In FIG. 7, 6 excluding the flat non-processed region R0
Individual processing areas TP1, TP2, TP3, TP4, TP
5, the center lines of TP6 are CL1, CL2, CL
3, CL4, CL5, CL6. Since the widths of the three processing regions TP3, TP4, TP5 change in the longitudinal direction, the six center lines CL1, CL2, CL
Some of 3, CL4, CL5, and CL6 are not parallel to each other and have angles with each other. Also wing tip side skin 63
When milling t, the three access panels 65, 66, 67 formed of different members are attached 3
The individual access holes 68, 69, 70 are simultaneously processed. In this way, before the shot peening is applied to the wing tip side skin 63t to give the curvature, the access holes 68, 6
By processing 9, 70, the processing becomes easy and the processing cost is reduced.

FIG. 11 shows the state of the back surface of the wing tip side skin 63t. 7 areas TP1, TP2, TP3, T
Boundary of P4, TP5, R0, TP6 and processing area TP
2. Since the center lines CL2 and CL3 of TP3 are straight lines having no curvature, eight stringers 71 ... (Or spars) fixed with rivets are formed in a straight line. On the other hand, all of the plurality of stringers 72 that intersect with the linear stringers 71 are curved and are divided at positions that intersect with the linear stringers 71.

The wing tip side skin 63t is made of an aluminum alloy having a thickness of 2.3 mm, and the thickness is reduced at the position surrounded by the stringers 71, ... A large number of pockets 73 ... These pockets 73 ... Are hatched in FIG. As shown in Table 1, the pocket 73 ...
Has three thicknesses of 0.8 mm, 1.2 m, and 1.5 mm, and all are mechanically milled before the shot peening of the blade tip side skin 63t.
If the wing tip side skin 63t is subjected to shot peening to give the curvature and then the pockets 73 are to be processed, an expensive 5-axis milling machine is required, but the wing tip side skin 63t is shot peened. In the flat state before application, it becomes possible to process the pockets 73 ... With an inexpensive 3-axis milling machine, and the processing cost is reduced.

Next, a method of measuring the peening intensity of shot peening will be described with reference to FIGS.

As shown in FIG. 12 (A), a belt-shaped plate-shaped work 82 is fixed to a holder 81 with a plurality of bolts 83, and shot from the shot peening device 51 while feeding the plate-shaped work 82 in the longitudinal direction. Project the material. Figure 1
As shown in FIG. 2 (B), when the bolts 83 ... Are removed after the completion of processing, the plate-shaped work 82 bends in an arch shape with the surface on which the shot material collides as the outside. The reason is the plate-shaped work 8
When the shot material collides with the surface of 2, the portion where the shot material collides is crushed and a compressive stress is generated. Therefore, at the moment when the bolts 83 are removed and the constraint of the plate-like work 82 is released, the compressive stress causes The surface of the plate-shaped work 82 extends and curves outward. As shown in FIG. 12C, the arc height H indicating the degree of bending of the plate-shaped work 82 is measured by the dial gauge 84.

FIG. 13 shows that predetermined shot conditions (projection amount; 2 kg / mi) are applied to plate-like works 82 of various thicknesses.
n, projection speed: 50 m / sec, projection distance: 500 m
When the shot peening is performed at m and a feed speed of 1 m / min), the arc height H is measured at each position in the longitudinal direction of the plate-like work 82. The arc height H becomes maximum at the central portion in the longitudinal direction of the plate-like work 82 and decreases symmetrically toward both ends. Of course, the arc height H decreases as the thickness of the plate-shaped work 82 increases. By measuring the arc height H by performing the test (almen test) using the plate-shaped work 82 in this way, the peen strength correlated with the arc height H can be known. Moreover, the center of the distribution of the shot material projected from the shot peening device 51 (projection center) can be known by the Almen test.

FIG. 14 shows the relationship between the feed rate of plate-shaped works of various plate thicknesses and the radius of curvature of the plate-shaped works. The shot conditions at this time are: projection amount; 4 kg / m
in, projection speed; 60 m / sec, projection distance; 500 m
m. This data can be obtained by repeating the above Almen test under various shot conditions.
For example, a plate-shaped workpiece with a plate thickness of 2 mm has a radius of curvature of 2000 m.
To machine to m, the feed rate of the plate-shaped work is 3.2m /
It turns out that it is sufficient to set to min. This data is stored in the control means U.

Next, the step of forming the blade tip side skin 63t by shot peening will be described.

.. First, the outer periphery is cut out from a plate material of an aluminum alloy having a plate thickness of 2.3 mm by milling using a triaxial NC processing machine to form a flat blank material of the blade tip side skin 63t (see FIG. 7). At this time, the three access holes 68, 6 extending over the processing areas TP1, TP2
9, 70 are milled at the same time. In the embodiment, the blank material and the access hole 6 are formed by milling.
Although 8, 69 and 70 are formed, it is also possible to punch a flat blank material by press working and simultaneously punch out three access holes 68, 69 and 70 at this time. Then, in order to reduce the weight of the wing tip side skin 63t, the pockets 73 ... Are machined on the back surface thereof with a triaxial milling machine.

.. Next, the completed wing tip side skin 63t
6 processing areas TP1, TP2, TP3, TP4, TP5, TP to be processed based on the three-dimensional shape data of
For each of the six, its radius of curvature data is determined (see Table 1).

.. Next, the shot material projection conditions, that is, the shot material projection amount, shot material projection speed, shot material projection distance, and shot material particle size are determined.

.. Subsequently, the shot condition of the shot material and the processing regions TP1, TP2 of the blade tip side skin 63t,
Based on the plate thickness of TP3, TP4, TP5, TP6,
The feed speed of the blade tip side skin 63t for obtaining a desired radius of curvature is determined from the data shown in FIG.

.. Subsequently, before actually starting shot peening, it is confirmed by comparison with the test results of the Almen test described in FIGS. 12 and 13 that the position of the projection center of the shot peening device 51 and the peen strength are normal. To do.

.. Subsequently, the shot peening device 51
The wing tip side skin 63t is fixed to the work supporting plate 42 of FIG. Each processing area TP1, TP2, T
When processing P3, TP4, TP5, and TP6 in order from the processing area TP1, the remaining processing areas TP1, TP2, and T
Masking is applied to P3, TP4, TP5, and TP6 with a synthetic resin or the like so that the shot material does not collide, and in that state, the shot material is projected from the shot peening device 51 under predetermined shot conditions to perform processing.

FIG. 15 shows a state in which the processing area TP4 is processed as an example. At this time, the cylinder 23 is expanded and contracted to move the second slide plate 22 in the front-rear direction (Y-axis direction), and the projection distance (distance between the shot peening device 51 and the surface of the wing tip side skin 63t) reaches a set value. The work support plate 42 is rotated around the Y axis by the rotation means 49 about the Y axis to adjust the center line CL4 of the processing region TP4 along the horizontal direction (X axis direction), and the motor 41 Drive the third slide plate 3
3 is moved in the vertical direction (Z-axis direction), and the height of the projection center of the shot peening device 51 is adjusted to match the height of the center line CL4 of the processing region TP4.

When the preparation for starting the shot peening is completed as described above, the frequency of the drive current of the variable speed motor 15 is controlled by the command from the control means U to move the first slide table 14 in the left-right direction (X The shot material is projected from the shot peening device 51 onto the surface of the blade tip side skin 63t while being moved in the axial direction) at a preset feed speed. As is clear from Table 1 and FIG. 10, the processing region TP4 is divided into four portions having different curvature radii in the longitudinal direction (X-axis direction), and the radius of curvature is 400 mm at the portion where the initial feed width is 500 mm. , The next feed width is 35
The radius of curvature of the 0 mm portion is 460 mm, and the radius of curvature of the next feed portion of 300 mm is 500 mm,
The radius of curvature is 560 m in the last part where the feed width is 430 mm
m.

Therefore, the radius of curvature is 400 mm → 460 m
The feed speed of the wing tip side skin 63t is increased by 0.8 m / sec with the stepwise increase from m → 500 mm → 560 mm.
→ 0.9 m / sec → 1.0 m / sec → 1.1 m / s
It is possible to give a desired curvature to the entire processing region TP4 by gradually increasing the ec and gradually weakening the peen strength.

.. The final processing area TP6 has five curvature areas TP1, TP2, TP3, TP4, TP.
Since it is the reverse of 5, the wing tip side skin 63t is turned upside down and fixed to the work support plate 42, so that the wing tip side skin 63t
Shot peening is applied to the back surface side of t to give a curvature in the opposite direction. Of course, in this case as well, the work support plate 42 is rotated about the rotation axis 43 by the Y-axis rotation means 49 so that the center line CL6 of the processing region TP6 is horizontal (X
Adjust it along the (axial direction), and slide the 3rd slide plate 3
3 is moved in the vertical direction (Z-axis direction) so that the height of the projection center of the shot peening device 51 matches the height of the center line CL6 of the processing region TP6. Since the machining region TP6 has a constant curvature of 1100 mm over the entire width in the longitudinal direction, the blade tip side skin 63t.
The shot peening is carried out while maintaining the feed rate of No. 2 at a constant value of 2.8 m / sec.

.. Finally, when the blade tip side skin 63t is removed from the work support plate 42, the compressive stress on the surface (the processing region TP6 is the back surface) of the blade tip side skin 63t generated by shot peening is released, so the blade tip side skin 6 is released.
3t is curved into a preset three-dimensional shape. Then, the blade tip side skin 63t that has been molded is overlaid on the master model for shape confirmation, and it is confirmed that the shape is finished accurately.

As described above, when the blade tip side skin 63t is subjected to shot peening to give a curvature, the blade tip side skin 63t is rotated around the Y axis and the blade tip side skin 6 is formed.
With the 3t position adjusted in the Z-axis direction, the feed speed in the X-axis direction of the blade tip side skin 63t is adjusted to change the peen strength, so there is no need to press with an expensive die and The blade tip side skin 63t can be processed into an arbitrary double curved surface at low cost without the need for the shot peening device 51.

When the wing tip side skin 63t is in the state of a flat blank material, the wing tip side skin 63t is trimmed, the access holes 68, 69, 70 and the pocket 7 are formed.
Since mechanical milling with 3 ... is performed in advance, and then curvature imparting processing by shot peening is performed,
It is not necessary to perform milling with an expensive 5-axis milling device or chemical milling that requires troublesome masking work after the formation of the blade tip side skin 63t is completed. It is possible to minimize deterioration of the accuracy of the blade tip side skin 63t that has been molded by processing.

Although the embodiments of the present invention have been described above, the present invention can be modified in various ways without departing from the scope of the invention.

For example, in the embodiment, as the pre-processing required for the wing tip side skin 63t to function as a product after molding, mechanical milling processing of the pockets 73, punching processing of the access holes 68, 69, 70, Although the trimming process of the blade tip side skin 63t is illustrated, the preprocessing is not limited thereto.

Further, the plate-shaped work of the present invention is not limited to the blade tip side skin 63t of the pylon 63 described in the embodiment, and may be the blade root side skin 63r of the pylon 63 or any other member.

Further, in the embodiment, the processing areas TP1, TP2, TP3, TP4, TP5, TP of the wing tip side skin 63t are formed.
When processing No. 6, the projection distance is fixed to a constant value (500 mm). For example, when the plate thickness of the blade tip side skin 63t is thick, the projection distance is shortened, and when the plate thickness is thin, the projection distance is fixed. It may be adjusted to make it longer.

Further, in the embodiment, the X axis is horizontal, but
The direction does not necessarily have to be horizontal as long as it is a direction orthogonal to the Y axis that is the projection direction of the shot material.

[0059]

As described above, according to the invention described in claim 1, the plate-shaped work is manufactured as a product after the molding before the shot is projected to give a predetermined curvature to the plate-shaped work. Pre-processing required for functioning is performed in advance, and then shot material is projected onto the plate-shaped work to give a predetermined curvature, so the pre-processing is performed in a flat state where the plate-shaped work does not have a curvature. Not only can it be performed at a certain time, facilitating the processing, improving the processing accuracy, and reducing the processing cost, but also reducing the post-processing performed after forming the plate-shaped work to reduce the plate-shaped work by the post-processing. Accuracy deterioration can be suppressed to a minimum.

According to the invention described in claim 2,
Since the plate-like work is the skin of the pylon that supports the engine of the airplane, it is possible not only to mold a skin with a large curvature change without using an expensive mold, but also to change the design of the curvature of the skin. It can be easily dealt with.

According to the invention described in claim 3,
When the plate-like work is in a flat state with no curvature, mechanical milling as pre-processing is performed.
It is possible to perform milling with an inexpensive 3-axis milling machine without the need for a shaft milling machine and without chemical milling, which is troublesome for masking work, which contributes to a reduction in machining cost. it can.

[Brief description of drawings]

FIG. 1 is a front view of a plate-shaped work forming apparatus.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

4 is an enlarged view of part 4 of FIG.

5 is an enlarged sectional view taken along line 5-5 of FIG.

FIG. 6 is a perspective view of an airplane

FIG. 7 is a view in the direction of arrow 7 in FIG. 6 (a diagram showing the wing tip side skin surface side).

8 is a sectional view taken along line 8-8 of FIG.

9 is a sectional view taken along line 9-9 of FIG.

FIG. 10 is a diagram showing the shape and radius of curvature of each processing region of the wing tip side skin.

FIG. 11 is a view showing a back surface side of a wing tip side skin corresponding to FIG. 7.

FIG. 12 is a diagram illustrating a method for measuring peen strength.

FIG. 13 is a graph showing the relationship between the position of a curved plate-like work and the arc height.

FIG. 14 is a graph showing the relationship between the feed rate and the radius of curvature for plate-shaped works with various plate thicknesses.

FIG. 15 is an explanatory view of the action when processing the processing area TP4 of the wing tip side skin.

FIG. 16 is an operation explanatory view when processing the processing area TP6 of the wing tip side skin.

[Explanation of symbols]

62 engine 63 pylon 63t Wing tip side skin (plate work)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takumi Shibata             1-10, Shin-Sayama, Sayama City, Saitama Prefecture             Within Da Engineering Co., Ltd.

Claims (3)

[Claims] 1. A method of forming a plate-like work (63t) which projects a shot material onto a plate-like work (63t) to give a predetermined curvature, wherein the plate-like work (63) before forming to give a predetermined curvature is formed.
In t), a first step of performing pre-processing required for the plate-shaped work (63t) to function as a product after molding, and a shot material is projected onto the pre-processed plate-shaped work (63t). And a second step of imparting a predetermined curvature to the plate-shaped workpiece. 2. The method for forming a plate-shaped work according to claim 1, wherein the plate-shaped work (63t) is a skin of a pylon (63) supporting an engine (62) of an airplane. 3. The method for forming a plate-shaped work according to claim 1, wherein the pre-processing is a mechanical milling process for reducing the weight of the plate-shaped work (63t).