JP3460065B2 - Equipment for manufacturing perforated sheet material for aircraft engine nacelle sound-absorbing panels - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a porous plate material for aircraft engine nacelle sound absorbing panel.

[0002]

2. Description of the Related Art In an aircraft, a honeycomb sandwich structure having a sound absorbing performance called a sound absorbing panel is used in a portion called an engine nacelle that covers the engine in order to prevent noise generated by the engine. A perforated plate having a large number of holes is used for the face plate of the honeycomb sandwich structure, and the perforated plate is conventionally made of an aluminum alloy. This aluminum alloy perforated plate is produced by punching, drilling, or the like, and then forming it into an engine nacelle by press molding, stretch molding, Burson molding, or the like.

By the way, in the case where the airfield has been in a coastal area for a long time, or in the case of an aircraft which frequently flies over the sea, the engine often receives a wind containing a large amount of salt, and the metal engine nacelle is corroded by salt damage. It has been viewed as a problem.
Therefore, in recent years, in order to reduce the weight and improve the corrosion resistance, development of a composite engine nacelle instead of a metal (aluminum alloy) has been advanced. However, the process of manufacturing a composite perforated plate is difficult, and until now a method of forming a composite material into a nacelle shape and hardening and then drilling holes (still the mainstream in the world), or a plastic with many punching pins A method has been adopted in which a pin plate made by piercing a composite material before curing is heat-cured to form a perforated plate. (Unexamined-Japanese-Patent No. 47-2131) Moreover, these days, the uncured composite material (prepreg) is preheated until the resin flow deteriorates, punched in a flat plate state with a punch, and thereafter, it is formed on a curved surface forming die. A method of heat curing is also introduced. (JP-A-10-128778)

However, in the method of forming the composite material material into a nacelle shape and then drilling it with a drill after it is hardened, it takes time and cost to process it. An NC control drill machine is required, and its introduction and maintenance will be difficult. In addition, the method of piercing the plastic pin plate into the composite material before curing and then heating and curing it into a perforated plate requires the pin plate to be manufactured in accordance with the three-dimensional contour, and it takes a lot of time to manufacture the plate. And costly. Furthermore, after preheating the prepreg, punching it in a flat plate state with a punch, and then applying it to a curved surface mold to heat-cure the prepreg as a whole, because the entire prepreg is stiff and loses its adhesive force. It will be difficult.

[Problems to be Solved by the Invention]

Therefore, in order to eliminate the above-mentioned problems of the prior art, the present invention can accurately, quickly and easily make a large number of holes in an uncured fiber reinforced resin prepreg face plate. In addition, heat during drilling is applied only around the holes to prevent the resin in the prepreg from flowing into the holes in the subsequent curing step in the autoclave, and the entire uncured fiber-reinforced resin prepreg perforated plate is softly adhered. It is intended to provide an apparatus for manufacturing a perforated plate material for aircraft engine nacelle sound absorbing panel, which is capable of being maintained in a forceful state and which can be easily shaped and attached to a curved surface forming die in a subsequent step. .

[0006]

An apparatus for manufacturing a perforated plate material for an aircraft engine nacelle sound absorbing panel according to the present invention for solving the above-mentioned problems is provided by crimping a plurality of uncured fiber reinforced resin prepreg face plates for feeding. When the feeding means and the uncured fiber reinforced resin prepreg face plate fed by the feeding means are stopped, they are fixed by being sandwiched between the upper holding plate having many holes and the lower receiving blade / holding plate. The fixing means and the uncured fiber reinforced resin prepreg face plate fixed by the fixing means are perforated with a large number of holes by a perforating blade tool, and at the same time, heat is applied only around the holes from the perforating blade tool during prepreg. And a piercing means for semi-curing the resin, and the uncured fiber reinforced resin prepreg porous surface plate that is sent after being pierced by the piercing means is cut with a cutting blade at fixed intervals and at the same time from the cutting blade to a cutting portion. Just heat It is given to those comprising more with cutting means for semi-curing the resin in the prepreg.

In the above-described apparatus for manufacturing a porous plate material for an aircraft engine nacelle sound absorbing panel of the present invention, the piercing tool of the piercing means for the uncured fiber reinforced resin prepreg face plate is subjected to ultrasonic vibration by an ultrasonic oscillator. It is preferable that the frictional heat by ultrasonic vibration is applied only around the holes at the time of drilling, or the heat is applied by the heater to only apply the heat around the holes at the time of drilling.

Further, the cutting blade of the cutting means for cutting the uncured fiber reinforced resin prepreg porous surface plate into a predetermined size is also subjected to ultrasonic vibration by the ultrasonic oscillator so that friction heat due to ultrasonic vibration is applied only to the cutting portion during cutting. It is preferable that the heat is applied or heat is applied by a heater to apply heat only to the cut portion during cutting.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an apparatus for manufacturing a porous plate material for an aircraft engine nacelle sound absorbing panel according to the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a base of the manufacturing apparatus. A roll stand 2 is installed at one end of the roll stand 1.
In this example, three uncured fiber reinforced resin prepreg face plate rolls 3 are supported in the upper, middle and lower stages. A feeding means 5 for the uncured fiber reinforced resin prepreg face plate 4 fed from the roll 3 is provided at the end of the roll stand 2. That is, the feeding means 5 guides the uncured fiber reinforced resin prepreg face plate 4 fed from the upper roll 3, and the guide roller 6 guides the uncured fiber reinforced resin prepreg face plate 4 fed from the middle roll 3. 7 and a guide roller 8 for guiding the uncured fiber reinforced resin prepreg face plate 4 passing through these guide rollers 6 and 7 and the uncured fiber reinforced resin prepreg face plate 4 fed from the lower roll 3 in an overlapping manner. A face plate feeding mechanism 9 for feeding the uncured fiber-reinforced resin prepreg face plate 4 stacked on the base 1 and a pressure roller 10 for pressure-bonding the three uncured fiber reinforced resin prepreg face plates 4 stacked at the beginning of feeding.
It consists of The face plate feeding mechanism 9 in the feeding means 5 having such a configuration has the rails 12 with the guide grooves 11 fixed to both side ends of the base 1 from the vicinity of the pressure bonding roller 10 to the vicinity of the cutting means described later, and the guide of this rail 12. It is composed of a face plate suction tool 13 which is self-propelled along the groove 11. The pressure roller 10 in the feeding means 5 is a heating type,
The press machine 15 supported by the support frame 14 heats the uncured fiber reinforced resin prepreg face plate 4 to reduce the viscosity of the resin in the prepreg and press-bond it to expel air between the prepregs and bring them into close contact.

In front of the pressure roller 10, when the uncured fiber reinforced resin prepreg face plate 4 fed by the face plate feeding mechanism 9 of the feeding means 5 is intermittently stopped, the face plate 4 is fixed. Means 16 are provided. This fixing means 16 has a large number of holes 17, and an actuator 18
It consists of an upper presser plate 19 that can be moved up and down by means of an upper presser plate 19 and a lower receiving blade / presser plate 21 that is fixedly mounted on the base 1 having a large number of holes 20 at the same position. The face plate 4 is sandwiched and fixed by the plates 19 and 21.

At the same position as the fixing means 16, a large number of holes are opened in the uncured fiber reinforced resin prepreg face plate 4 fixed by the fixing means 16 and at the same time heat is applied only around the holes to prepare the prepreg. A punching means 22 for semi-curing the resin therein is provided. This punching means 22 comprises a large number of punching tools 23, which correspond to the large numbers of holes 17 and 20 of the upper and lower pressing plates 19 and 21, which are divided into two parts in the front-rear direction and three parts in the left-right direction. The punching jigs 24 are each moved up and down by a press 25. In the case of this example, ultrasonic vibration is applied to the hole cutting tool 23 of the hole forming means 22 by the ultrasonic oscillator 26, and frictional heat due to the ultrasonic vibration is applied only around the hole when the hole is formed. . Then, the press 25 in the punching means 22
The actuator 18 for moving the upper holding plate 19 of the fixing means 16 up and down is mounted on a base 29 that straddles the base 1.
It is fixed on the top.

Below the punching means 22, that is, below the case base 1, there is provided a prepreg collecting means 28 for collecting the prepreg punched out by punching by vacuum suction. The prepreg collecting means 28 is provided on the base 1
A prepreg collecting chute 29 provided below the upper receiving blade / holding plate 21, a collection box 30 connected to the prepreg collecting chute 29, a vacuum chamber 32 connected to the prepreg collecting chute 29 via a vacuum suction pipe 31, and the vacuum chamber. 32 and a vacuum pump 33 connected via a vacuum suction pipe 31 ′.

At the other end of the base stand 1, an uncured fiber reinforced resin prepreg porous surface plate 34, which has been perforated by the perforation means 22 and then fed, is guided by a guide roller 35 and then at a predetermined size. A cutting means 36 for cutting is provided. This cutting means 36 lowers the cutting blade 37 by an actuator 38. In this example, ultrasonic vibration is applied to the cutting blade 37 by an ultrasonic oscillator 39, and only the cutting portion at the time of cutting is subjected to ultrasonic vibration. Friction heat is applied, and the ultrasonic oscillator 39 traverses the groove rail 41 on the frame 40 straddling the base 1 and traverses and cuts the lowered cutting blade 37 to uncured fiber reinforced resin prepreg porous. The face plate 34 is cut.

In front of the cutting means 36, a perforated plate material for an aircraft engine nacelle sound absorbing panel, which is composed of an uncured fiber reinforced resin prepreg perforated plate 34 'of a certain size, which is connected to the base 1 and cut by the cutting means 36. Receiving means 42 for receiving is provided. This receiving means 42
A curved receiving plate 43 recessed downward and a plurality of uncured fiber-reinforced resin prepreg porous surface plates 3 received on the receiving plate 43
It is composed of a lid plate 44 having a curved surface which is depressed downward to hold 4 '.

The operation of the apparatus for manufacturing the porous material for aircraft engine nacelle sound absorbing panel of the embodiment configured as described above will be described. First, the upper row of roll stand 2,
The uncured fiber reinforced resin prepreg face plate 4 is fed from the three rolls supported in the middle and lower stages, and the uncured fiber reinforced resin prepreg face plate 4 is fed from the upper and middle rolls.
Is passed through the guide rollers 6 and 7 and then stacked on the uncured fiber reinforced resin prepreg face plate 4 fed out from the lower roll 3 and guided by the guide roller 8, and the three stacked uncured fiber reinforced resins are stacked. The prepreg face plate 4 is heated and pressure-bonded by the heat-type pressure-bonding roller 10, and then sucked by the face-plate suction device 13 of the face-plate feeding mechanism 9 in the feeding means 5, and the face-plate suction device 13 is attached.
Is self-propelled along the guide groove 11 of the rail 12, and the uncured fiber-reinforced resin prepreg face plate 4 is fed forward.

The uncured fiber reinforced resin prepreg face plate 4 fed by the face plate feeding mechanism 9 is automatically stopped when reaching the front half position of the punching means 22, and the uncured fiber reinforced at the position of the punching means 22 is reinforced. The resin prepreg face plate 4 is fixed by the fixing means 16. That is, the upper pressing plate 19 is lowered by the actuator 18, and is sandwiched and fixed between the lower receiving blade / pressing plate 21 on the base 1.

A large number of holes H are formed in the fixed uncured fiber reinforced resin prepreg face plate 4 by the hole forming means 22 and at the same time heat is applied only around the holes to semi-cure the resin in the prepreg. . That is, ultrasonic vibration is applied to a large number of punching tools 23 by the ultrasonic oscillator 26 integrated with the six punching jigs 24, and the six punching jigs 24 are lowered by the press machine 25 respectively. As shown in FIG. 3A, ultrasonic frictional heat is generated at the cutting edge of the punching tool 23 which is in contact with the uncured fiber reinforced resin prepreg face plate 4, and the shearing action between the cutting edge and the receiving blade / holding plate 21 in this state causes As shown in FIG. 3b, a hole H is formed in the uncured fiber reinforced resin prepreg face plate 4 and at the same time, the hole periphery is instantaneously heated by the ultrasonic frictional heat of the hole forming tool 23, and the resin in the prepreg around the hole is formed. To semi-cure. Therefore, the resin in the prepreg does not flow into the opened hole H in the subsequent curing step in the autoclave.

The prepreg P, which has been punched out as shown in FIG. 3c, sucks the air in the prepreg collecting chute 29 into the vacuum chamber 32 by driving the vacuum pump 33 shown in FIGS. By
The prepreg collecting chute 29 is dropped and stored in the collecting box 30.

By the operation of the hole forming means 22, holes H are formed in the front end portion of the uncured fiber reinforced resin prepreg face plate 4 by three blocks as shown in FIG. 4a. Then, the six punching jigs 24 of the punching means 22 are connected to the press machine 2 respectively.
5, the punching tool 23 is pulled out from the hole 17 of the upper holding plate 19, and the upper holding plate 19 is raised by the actuator 18 to release the uncured fiber reinforced resin prepreg face plate 4 and then the face plate feed The mechanism 9 sends it to the latter half position of the punching means 22 and stops automatically. Thereafter, similarly to the above, the uncured fiber reinforced resin prepreg face plate 4 is fixed by the fixing means 16 and perforated by the perforating means 22, and the tip of the uncured fiber reinforced resin prepreg face plate 4 is shown in FIG. As shown in FIG. 4, the holes H are opened for the remaining three blocks, and the holes H similar to those shown in FIG.
Is drilled for 3 blocks. In this way, the uncured fiber-reinforced resin prepreg face plate 4 becomes the porous face plate 34 by intermittent feeding, fixing at the time of stop, and punching.

This uncured fiber reinforced resin prepreg porous face plate 34 is fed by the face plate feeding mechanism 9 in the feeding means 5 and further fed by a certain size via the guide roller 35 near the other end of the base 1. It is cut by the cutting means 36 at the other end of the base 1. That is, the cutting blade 37 of the cutting means 36 is lowered by the actuator 38 and comes into contact with the uncured fiber reinforced resin prepreg porous surface plate 34, and at the same time, ultrasonic vibration is applied to the cutting blade 37 by the ultrasonic oscillator 39. When the ultrasonic oscillator 39 traverses the groove rail 41 on the base 40 that straddles the base 1, the cutting blade 37 traverses and the uncured fiber-reinforced resin prepreg porous surface plate 34 is cut and cut into a certain size. At the same time, ultrasonic friction heat is generated at the cutting edge of the cutting blade 37, and only the cutting portion is instantaneously heated by this ultrasonic friction heat, and the resin in the prepreg of the cutting portion is semi-cured. Therefore, the cut end of the fiber of the cut portion does not protrude to the outside, and the cut end becomes clean.

The porous plate material for aircraft engine nacelle sound absorbing panel consisting of the uncured fiber reinforced resin prepreg porous plate 34 'which is cut into a certain size in this way is provided below the receiving means 42 connected to the base 1 in sequence. It is received by the concave receiving plate 43, and a plurality of cover plates 4 are received.
It is held down at 4 and held in a curved shape.

The punching tool 23 of the punching means 22 for the uncured fiber reinforced resin prepreg face plate 4 in the apparatus for manufacturing a porous plate material for an aircraft engine nacelle sound absorbing panel of the above-mentioned embodiment is ultrasonically vibrated by the ultrasonic oscillator 26. Is added to provide frictional heat by ultrasonic vibration only around the hole when drilling, but instead of this, it is a drilling tool that heats with a heater and applies heat only around the hole when drilling. It may be. Further, the cutting blade 37 of the cutting means 36 for cutting the uncured fiber reinforced resin prepreg porous surface plate 34 into a predetermined size is subjected to ultrasonic vibration by the ultrasonic oscillator 39, and friction by ultrasonic vibration is applied only to the cutting portion during cutting. Although heat is applied, a cutting blade that heats with a heater and applies heat only to the cutting portion during cutting may be used instead.

[0023]

As can be seen from the above description, according to the apparatus for manufacturing a perforated plate material for aircraft engine nacelle sound absorbing panel of the present invention, the uncured fiber reinforced resin prepreg face plate is fed, stopped, and punched. Since a series of steps of sending, cutting and receiving the porous plate can be automatically performed,
An uncured fiber reinforced resin prepreg porous surface plate which is a porous plate material for an aircraft engine nacelle sound absorbing panel can be manufactured accurately, quickly and easily.

Further, a large number of holes are punched in the uncured fiber reinforced resin prepreg face plate by a punching tool to which ultrasonic vibration is applied by an ultrasonic oscillator, and frictional heat is applied only around the holes by ultrasonic vibration. Alternatively, since the holes are punched by the punching tool to which heat is applied by the heater and heat is applied only around the holes, the resin in the prepreg around the holes is semi-cured. Therefore, since the resin does not flow into the holes in the subsequent curing step in the autoclave, highly accurate holes can be obtained. Since the uncured fiber-reinforced resin prepreg porous surface plate as a whole maintains its softness and adhesive strength, it is easy to apply and attach to a curved surface molding die in a subsequent step.

Further, the uncured fiber reinforced resin prepreg porous surface plate is cut with a cutting blade to which ultrasonic vibration is applied by an ultrasonic oscillator to give frictional heat due to ultrasonic vibration only to the cut part, or to heat the cut part. Since the cutting is performed by a cutting blade tool to which heat is applied by a vessel and heat is applied only to the cutting portion, the resin in the prepreg of the cutting portion is semi-cured. Therefore, the cut end of the fiber of the cut portion does not protrude to the outside, and the cut end becomes clean.

[Brief description of drawings]

FIG. 1 is a perspective view of an apparatus for manufacturing a porous plate material for an aircraft engine nacelle sound absorbing panel according to the present invention.

FIG. 2 is a side view of FIG.

3A to 3C are partially enlarged views showing a process of punching a uncured fiber reinforced resin prepreg face plate with a punching tool in the manufacturing apparatus of FIG.

FIG. 4A and FIG. 4B are diagrams showing a process of intermittent feeding of uncured fiber reinforced resin prepreg face plate and perforation of each block.

[Explanation of symbols]

1 base stand 2 roll stand 3 Unhardened fiber reinforced resin prepreg face plate roll 4 Unhardened fiber reinforced resin prepreg face plate 5 feeding means 6,7,8 guide roller 9 Face plate feed mechanism 10 Crimping roller 11 Guide groove 12 rails 13 Face plate suction tool 14 Support frame 15 Press machine 16 Fixing means 17 Multiple holes in the upper holding plate 18 actuators 19 Upper holding plate 20 Multiple holes on the lower blade and presser plate 21 Lower blade and presser plate 22 Means for drilling 23 Drilling tools 24 Drilling jig 25 press 26 Ultrasonic oscillator 27 mounts 28 Prepreg collecting means 29 Prepreg collecting chute 30 collection boxes 31, 31 'Vacuum suction tube 32 vacuum chamber 33 vacuum pump 34,34 'uncured fiber reinforced resin prepreg porous surface plate 35 Guide roller 36 Cutting means 37 Cutting blade 38 Actuator 39 Ultrasonic oscillator 40 mounts 41 groove rail 42 Receiving means 43 Support plate 44 Lid plate H Holes made in uncured fiber reinforced resin prepreg face plate P prepreg removed by drilling

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B29L 31:30 B29L 31:30 (56) References JP-A-10-128778 (JP, A) JP-A-4-339611 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 43/00-43/58

Claims (3)

(57) [Claims] 1. A feeding means for pressing and feeding a plurality of uncured fiber reinforced resin prepreg face plates, and a large number when the uncured fiber reinforced resin prepreg face plates fed by the feeding means are stopped. Fixing means for sandwiching and fixing between the upper holding plate having the holes and the lower receiving blade / holding plate, and forming a large number of holes in the uncured fiber reinforced resin prepreg face plate fixed by the fixing means. A hole forming means for making a hole with a cutting tool and at the same time applying heat only around the hole from the cutting tool to semi-harden the resin in the prepreg, and an uncured fiber reinforcement that is sent after the hole has been formed by the hole forming means. Perforated plate material for aircraft engine nacelle sound absorption panel consisting of a cutting means for cutting a resin prepreg perforated plate with a cutting blade at regular intervals and at the same time applying heat only from the cutting blade to the cutting portion to semi-cure the resin in the prepreg Manufacturing of apparatus. 2. The apparatus for manufacturing a porous plate material for an aircraft engine nacelle sound absorbing panel according to claim 1, wherein the piercing tool of the piercing means for the uncured fiber reinforced resin prepreg face plate is subjected to ultrasonic vibration by an ultrasonic oscillator. An aircraft characterized by being subjected to frictional heat by ultrasonic vibration only around the hole when drilled, or by being heated by a heater and only applying heat around the hole when drilling Engine Nacelle Perforated plate manufacturing equipment for sound absorbing panels. 3. The apparatus for manufacturing a perforated plate material for aircraft engine nacelle sound absorbing panel according to claim 1 or 2, wherein the cutting blade of the cutting means for cutting the uncured fiber reinforced resin prepreg perforated plate at a constant size is an ultrasonic wave. Ultrasonic vibration is added by the oscillator to give frictional heat by ultrasonic vibration only to the cutting part at the time of cutting, or it is heated by a heater to give heat only to the cutting part at the time of cutting. Characteristic Aircraft Engine Nacelle Perforated plate material manufacturing equipment for sound absorbing panels.