JP5977692B2 - Low rigidity composite material drilling equipment - Google Patents

Description

  The present invention provides a low-rigidity composite material in which a drilling process is performed on a low-rigidity composite material obtained by laminating a metal material such as an aluminum plate, an aluminum alloy plate, a titanium plate or a titanium alloy plate, and a reinforced plastic plate such as a CFRP plate. The present invention relates to a hole drilling apparatus.

  Conventionally, metal plates such as aluminum plates, aluminum alloy plates, titanium plates and titanium alloy plates have been used for aircraft parts. Recently, however, fiber reinforced plastic plates made of carbon fiber and resin, especially carbon fiber reinforced plates. Because plastic plates (CFRP plates) are more durable than metal materials, do not rust, and are lightweight, they include ladders, rudder, elevators, spoilers, outboard ailerons, wing trunk fairs. It has been used as a material for aircraft parts such as rings, front and main landing gear doors, main and tail trailing edge panels, and vertical and horizontal stabilizer ribs, and has contributed to weight reduction of aircraft.

  CFRP is also adopted for vertical and horizontal stabilizers, floor beams, and tails, which are primary structural materials for aircraft parts where damage tolerance is important. Aircraft with a usage rate of over 50% have been developed and are currently in service.

  Such drilling in aircraft parts requires about 12,000 locations per part, and about 4000 drills are used for this drilling. Such drilling can be automatically processed by a machine if it is a conventional metal aircraft part. However, because aircraft parts using fiber reinforced plastic plates such as CFRP have low rigidity, the material is bent and stable processing is not possible when automatic processing is performed by a machine, regardless of the number of holes that are drilled. There was a problem that we had to rely on manual processing.

  For example, a deep hole processing apparatus described in Patent Document 1 has been proposed as a hole processing apparatus for preventing a drilling defect during drilling. However, this drilling device is a drilling device developed with the object of solving the problems that occur when deep hole drilling is performed. That is, since the tool used for deep hole machining is long, the tool tip is oscillated in the radial direction during drilling, and a spiral flaw called a tool mark occurs on the inner surface of the deep hole. This is a drilling device developed to solve the problem that sometimes occurs.

  Therefore, using this deep hole processing machine, drilling into a low-rigidity composite material made by laminating a metal material such as an aluminum plate, an aluminum alloy plate, a titanium plate or a titanium alloy plate, and a reinforced plastic plate such as a CFRP plate. Even if the processing is performed, it is impossible to perform drilling on the material without causing the problem of deformation during drilling and the occurrence of defective drilling.

  Thus, no drilling device has been proposed for drilling a low-rigidity composite material in which different types of materials are laminated. Even a low-rigidity composite material containing a low-rigidity material such as a CFRP plate is not suitable for drilling. The development of a drilling device suitable for drilling low-rigidity composite materials that can perform stable automatic drilling without bending has been awaited.

JP 2008-6532 A

  The present invention has been made as a solution to the above-described conventional problems, and even when drilling a low-rigidity composite material using a reinforced plastic plate such as a CFRP plate, the material is not deformed during drilling. It is another object of the present invention to provide a low-rigidity composite material drilling apparatus that can perform stable automatic drilling without causing a drilling defect.

The invention according to claim 1 is a low-rigidity composite material hole drilling device for drilling a composite material formed by laminating an aluminum plate and / or a titanium plate and a reinforced plastic plate. a load cell that converts into an electric signal by measuring the cutting resistance, as compared with cutting resistance data measured by the load cell, the cutting resistance limits on the predetermined cutting speed and feed rate of the saved A control device that determines whether the workpiece is an aluminum plate, a titanium plate, or a reinforced plastic plate, and determines the cutting speed and feed speed of the drill suitable for each material, and the determined cutting speed and feed speed. it comprises a motor for driving a drill, when the torque measured by the load cell is changed, the cutting speed and feed rate of the drill, respectively Serial change to saved predetermined value, using the measured value of the load cell at that time, and characterized in that the workpiece is determined aluminum plate, titanium plate, which one of the reinforced plastic plate This is a low-rigidity composite material hole drilling device.

  According to the low-rigidity composite material hole drilling apparatus of the present invention, even when drilling a low-rigidity composite material using a fiber reinforced plastic plate such as a CFRP plate, the material is not deformed during drilling. Thus, stable automatic drilling can be performed without causing any drilling defects.

1 shows an embodiment of the present invention and is a side view with a cross section of a part of a low-rigidity composite material hole drilling apparatus. It is a side view which shows the state which is drilling the low-rigidity composite material using the hole processing apparatus of the embodiment. It is a graph which shows the relationship of the torque, cutting speed, and feed rate of an aluminum plate. It is a graph which shows the relationship of the torque of a titanium plate, cutting speed, and feed rate. It is a graph which shows the relationship of the torque of a CFRP board, cutting speed, and feed rate. It is explanatory drawing which shows the operation | movement order at the time of giving a drilling process to a low-rigidity composite material using the drilling apparatus of embodiment of this invention.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

  FIG. 1 shows an embodiment of a low-rigidity composite material drilling apparatus A according to the present invention, and FIG. 2 shows an aluminum plate 8 made of aluminum or an aluminum alloy, a titanium plate or a titanium alloy. A state in which drilling is performed on a low-rigidity composite material B formed by laminating a metal material such as a titanium plate 9 and a reinforced plastic plate 10 such as a CFRP plate (carbon fiber reinforced plastic plate) is shown.

1 and 2, 1 is a rotatable drill that directly drills a low-rigidity composite material B, 2 is a motor that drives the drill 1 to rotate, and 3 is an electric machine that measures the cutting resistance during drilling. A load cell that converts the signal into an output signal, 4 is a feed shaft having a thread formed around it, 5 is a cylindrical feed device having a thread formed on the inner surface, and 6 is a load cell when there is a torque change during drilling. Compare the cutting force data measured in step 3 with the saved cutting force limit value to determine whether the workpiece is an aluminum plate, a titanium plate, or a fiber reinforced plastic plate, and drills suitable for each material 1 is a control device for determining a cutting speed and a feeding speed, and 7 is a frame for supporting the hole machining apparatus A.

  Next, using the low-rigidity composite material hole drilling apparatus A of the present invention, metal materials such as aluminum plate 8 made of aluminum or aluminum alloy, titanium plate 9 made of titanium plate or titanium alloy, and reinforcement of CFRP plate or the like The low stiffness composite material B formed by laminating the plastic plates 10 is switched to a cutting speed and a feeding speed suitable for each material while measuring the cutting resistance data of each material by using the load cell 3, and the drill 1 is driven to reduce the data. A method of drilling the rigid composite material B will be described.

  The low-rigidity composite material B used here is a three-layer low-rigidity composite material B composed of a reinforced plastic plate (CFRP plate) 10, a titanium plate 9, and an aluminum plate 8 from the drill 1 side. It may be a two-layer low-rigidity composite material B composed of a reinforced plastic plate 10 or a two-layer low-rigidity composite material B composed of a titanium plate 9 and a reinforced plastic plate 10, and the drill 1 side is a reinforced plastic plate 10 There may be. In the present invention, the low-rigidity composite material B is defined as a composite material including a low-rigidity material such as a CFRP plate. Specifically, the low-rigidity composite material B is determined by the pressure of the drill 1 during drilling with a rigidity of 100 GPa or less. Indicates a flexible composite material.

The aluminum plate 8 (plate thickness: 1 mm), the titanium plate 9 (plate thickness: 1 mm), and the CFRP plate 10 (plate thickness: 1 mm) 10 were drilled by a conventional machining center. In this case, the relationship between the torque (Nm), cutting speed (m / min), and feed rate (mm / rev) measured by the load cell 3 is shown in FIG. 3 for the aluminum plate 8 and FIG. 4 for the titanium plate 9. The CFRP plate 10 is shown in FIG. The torque limit of each material, that is, the cutting resistance limit value is 17 Nm for the aluminum plate 8, 15 Nm for the titanium plate 9, and 10 Nm for the CFRP plate 10. This is the stored cutting resistance limit value.

  From these results, in the present invention, when the cutting speed is 20 m / min and the feed speed is 0.1 mm / rev, the aluminum plate 8 when the torque is about 17 Nm, the titanium plate 9 when the torque is about 15 Nm, When it is about 10 Nm, it is determined that the CFRP plate 10 is used.

  In the present invention, when there is a torque change at the time of drilling (same at the start of drilling work), first, the cutting speed of the drill 1 is changed to 20 m / min and the feed speed is changed to 0.1 mm / rev. As shown in FIG. 6, the cutting resistance value at that time is measured by the load cell 3, and when it is around 17 Nm, it is an aluminum plate 8, when it is around 15 Nm, it is a titanium plate 9, and when it is around 10 Nm, a reinforced plastic plate (CFRP plate). 10 is determined. And instantaneously, it switches to the cutting speed and feeding speed suitable for every material.

  When it is determined that the material is the aluminum plate 8, the cutting speed is set to 40 m / min and the feed rate is set to the upper limit of 0.1 mm / rev. / Rev, the feed rate is set to the upper limit of 0.08 mm / min, and if the CFRP plate 10 is determined, the cutting speed is set to 30 m / min and the feed rate is set to the upper limit of 0.1 mm / rev. Change each to drill holes in low-rigidity composites.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, and the present invention is implemented with appropriate modifications within a range that can meet the gist of the present invention. These are all included in the technical scope of the present invention.

  Using the hole drilling apparatus of the present invention and a conventional machining center, the plate material was drilled. In the machining center, the aluminum plate (plate thickness: 1 mm), the titanium plate (plate thickness: 1 mm), and the CFRP plate (plate thickness: 1 mm) are each drilled with a hole diameter of 5 mm. And a machining center, two layers of low-rigidity composite material (each plate thickness: 1 mm) laminated with CFRP plate and titanium plate 9, and three layers of low-rigidity composite material (CFRP plate, titanium plate, aluminum plate) Each plate thickness: 1 mm) was also drilled with a hole diameter of 5 mm. In addition, the drill used the high-speed base material coating drill of diameter 5mm and length 150mm for both the hole processing apparatus of this invention and a machining center.

  The test was carried out by counting the number of drilling times until the drill was worn and drilling was impossible. In the drilling using the machining center, the rotation speed of the drill was fixed at 2000 rpm, the cutting speed was 20 m / min, and the feed speed was fixed at 0.1 mm / rev. The test results are shown in Table 1.

  In conventional machining centers, drilling was performed 12 to 500 times in the case of aluminum plate, titanium plate, CFRP plate, but 9 times in 3 layers of low stiffness composite material, 3 layers of low stiffness composite With the material, the drill was worn just by drilling three times, making it impossible to drill.

  On the other hand, when torque control is performed using the drilling device of the present invention, drilling can be performed 890 times with a two-layer low-rigidity composite material and 570 times with a three-layer low-rigidity composite material. It was.

DESCRIPTION OF SYMBOLS 1 ... Drill 2 ... Motor 3 ... Load cell 4 ... Feed shaft 5 ... Feed device 6 ... Control device 7 ... Frame 8 ... Aluminum plate 9 ... Titanium plate 10 ... Reinforced plastic plate (CFRP plate)
A ... Hole drilling device B ... Low-rigidity composite material

Claims (1)

A low-rigidity composite material hole drilling device for drilling a composite material formed by laminating an aluminum plate and / or a titanium plate and a reinforced plastic plate,
A load cell that measures the cutting resistance value at the time of drilling, converts it into an electrical signal, and outputs it,
And cutting resistance data measured by the load cell, by comparing the cutting resistance limits on the predetermined cutting speed and feed rate of the saved workpiece is an aluminum plate, titanium plate, which of the reinforced plastic plate A control device that determines the cutting speed and feed rate of a drill suitable for each material,
A motor that drives the drill at the determined cutting speed and feed rate ;
When the torque measured by the load cell changes, the cutting speed and feed rate of the drill are respectively changed to the stored predetermined values, and the measured value of the load cell at that time is used to change the workpiece. Is an aluminum plate, a titanium plate, or a reinforced plastic plate .

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