JP2792017B2 - Perforation method of composite panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for perforating a composite panel.
Relates to law, more particularly, formed by covering one or both surfaces of the core material at the surface material of a material harder than the core composite Pas
The present invention relates to a method of perforating a flannel .

[0002]

2. Description of the Related Art As shown in FIG. 6, as a composite panel of this kind, as shown in FIG. 6, a front surface and a back surface of a core material 20 made of a heat insulating material such as urethane foam resin are made of a material harder than this core material, for example, an aluminum plate or a stainless steel plate. There is known a heat insulating panel 17 having a sandwich structure which is covered with a metal surface material 21. When a bolt hole, a door handle hole, or the like is formed in the heat insulating panel 17, a normal drill is not used because the heat insulating panel 17 has a multilayer structure of a relatively hard layer and a relatively soft layer. Have difficulty.

For this reason, conventionally, as shown in FIGS. 6 (a) and 6 (b), first, a circular sawing process is performed on the surface material 21 on the front and back surfaces of the heat insulating panel 17 with a hole saw 25, and then, as shown in FIG. As shown in FIG. 3C, a drilling method is used in which the core material 20 is drilled with a woodworking drill 26 or the like.

[0004]

However, in the above-described drilling method, two steps of cutting and drilling are required, which is not only troublesome but also requires a large equipment cost for performing these processings. There was a problem. In addition, when the above-described cutting process is performed, a donut-shaped chip 27 as shown in FIG. 6B remains in the hole saw 25, so that the operation of removing the chip 27 is required, and further work is required. I was Further, in processing with the hole saw 25, the same blade portion continuously cuts the surface material 21, so that cutting heat and frictional heat are accumulated, and the blade portion is likely to be deteriorated and seizure with the surface material 21 is likely to occur. was there.

The present invention has been made in view of the above circumstances, and it is possible to easily perform perforation processing of a composite panel in one step, thereby improving productivity and reducing equipment costs, and also improving deterioration of a blade portion and the like. Composite with less seizure with surface material
It is an object of the present invention to provide a method for perforating a panel .

[0006]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The method for piercing a composite panel according to the present invention is a method for piercing a composite panel in which one or both surfaces of a core material made of a heat insulating material such as a foamed resin is covered with a surface material of a material harder than the core material. A conical drill body having a cutting edge, a blade portion formed on the conical surface of the drill body facing the rotation direction, and a plurality of formed at a predetermined interval in the axial direction formed on the conical surface along the circumferential direction. Using a conical drill with a notched groove, the cutting edge drills the surface material
The processing speed up to the above
The composite panel is perforated at a speed lower than the processing speed of perforating the core material .

Here, the surface material of a material harder than the core material refers to a metal plate such as an aluminum plate, an iron plate, a stainless steel plate, or a resin plate having a higher hardness than the core material. It is applied to panels, cold storage panels, freezer panels, and the like.

[0008]

According to the method of perforating a composite panel of the present invention, the conical surface of the conical drill body having a cutting edge at the tip is formed so as to face in the rotation direction with a conical surface, and a plurality of notches are formed on the conical surface. Using a conical drill with machining grooves
Therefore , even if the workpiece has a multilayer structure having different hardnesses, it is possible to continuously pierce the core material, and in particular, the surface of the core material is made of a harder material, such as an aluminum plate or a stainless steel plate. Suitable for perforating a composite panel covered with a metal sheet surface material. In other words, when punching a composite panel, conventionally two steps of cutting the surface material and drilling the core material were required, but it can now be easily performed in one step. And equipment cost can be reduced. Furthermore, unlike a hole saw, the cutting part of the workpiece is cut while constantly moving a part of the continuous blade part, so the temperature rise of the blade part is small, the blade part is deteriorated and the surface material is scorched. Is less likely to occur and durability can be improved.

Moreover, using a conical drill of the above configuration, the
The processing speed until the cutting edge is drilled through the surface material
From the drilling speed of the core material
Since the composite panel is perforated at a later time, the composite panel can be continuously perforated without imposing a load on the blade portion, and productivity can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

1 and 2, reference numeral 1 denotes a conical drill. The conical drill 1 has a conical drill body 3 having a cutting edge 2 at the tip.
A shank (handle) 4 is protruded from the base end opposite to the base. The angle α of the cone of the drill body 3 is set in the range of 20 to 90 degrees. In the case of the embodiment, the angle α is 20 degrees and the angle β of the cutting edge 2 is 90 degrees. An example of the dimensions of the drill body 3 is as follows.
Is 10 mm, the length l2 from the minimum diameter portion to the maximum diameter portion of the conical surface 5 is 35 mm, the diameter d1 of the minimum diameter portion is 15 mm, and the diameter d2 of the maximum diameter portion of the conical surface 5 is 27 mm (FIG. 4). reference). The drill body 3 is variously formed in accordance with the size of the hole to be drilled, for example, the diameter d2 of the largest diameter portion of the conical surface 5 is made 19 mm.

On the conical surface 5 of the drill body 3, blade portions 6, 6 'are formed facing the rotating direction (the direction of arrow A in FIG. 2), and notch grooves 7, 7' are formed along the circumferential direction. A plurality is formed in the axial direction. More specifically, the blade 6,
In FIG. 1 in which 6 'is formed as a pair, the outer surface of the drill body 3 is deep and wide across the conical surfaces 5, 5' at an inclination angle of about 15 degrees with respect to the axis thereof at the symmetric position on the outer surface. A pair of wide chip discharge grooves 8, 8 'are formed, and a linear edge portion 8 facing the rotation direction of these chip discharge grooves 8, 8'.
The blades 6 and 6 'are formed by a and 8a', and the conical surfaces are shifted by 0.5 mm from the center axis.

The conical surface 5 of the drill body 3 is separated into two parts by the shaving discharge grooves 8, and the notch grooves 7 are formed on both conical surfaces 5 horizontally and axially (in the height direction). ) Are formed at predetermined intervals p by a plurality (seven in the illustrated example). The width w of the notched groove 7 is 0.3 to
1.0 mm, depth e is 0.3 to 0.7 mm, interval p is 4
It is set to ６6 mm. In FIG. 1, the notched groove 7 is a V-shaped groove, and the notched groove 7 on one conical surface 5 and the notched groove 7 'on the other conical surface 5' are phase-shifted (about 2 mm) in the axial direction. Are shifted from each other, but may be formed on the same axis. Further, as a material of the drill body 3, for example, speed tool steel (HM42) is used, and a surface coating of titanium nitride (TiN) is applied to the drill body 3.

The conical drill 1 configured as described above is used, for example, by fitting the shank 4 to a chuck portion 11 at a lower end of a rotary shaft 10 of a vertical axis in a drilling device 9 as shown in FIG. You. The punching device 9 includes an apparatus main body 13 supported on a gantry 12 so as to be horizontally movable. The apparatus main body 13 includes a horizontal moving mechanism 14 including a ball screw or the like for moving the apparatus main body 13 in a horizontal direction.
A rotation mechanism 15 for rotating the rotation shaft 10 and a feed mechanism 16 for moving the rotation shaft 10 in the vertical direction are provided. A table 18 for mounting a heat-insulating panel 17 as a workpiece is provided below the apparatus main body 13 in the gantry 12, and a chuck 19 for fixing the heat-insulating panel 17 on the table 18 is provided. Is provided. In this case, the conical drills 1 provided for one drilling device are provided in an appropriate number and at a desired interval according to the number of desired holes, and are operated simultaneously or in an appropriate cycle. .

The heat insulating panel 17 is formed by covering one or both surfaces of a core material 20 made of a heat insulating material with a surface material 21 having a thickness of, for example, 0.3 to 1.2 mm, which is harder than the core material 20, for example, 30 to 200 mm. This is a composite panel having a thickness of, for example, a building, a wall material of a refrigerator, and the like. As the heat insulating material of the core member 20, a resin foam material such as polyurethane or polystyrene is used, and the foam density is 35 to 45.
Kg / m ³ . Further, as the surface material 21, for example, a metal plate of aluminum, stainless steel, or the like;
Alternatively, a hard plastic plate is used.

Next, a method of perforating the heat insulating panel 17 using the conical drill 1 will be described. In this embodiment, as shown in FIG. 4, a thickness t1 having a surface material 21 made of an aluminum plate having thicknesses t1 and t2 of 0.8 mm on both sides.
A heat insulating panel 17 having a diameter of 42 mm is used. Further, as the conical drill 1, the length l1 of the cutting edge 2 is 10 mm, and the length l2 from the minimum diameter portion to the maximum diameter portion of the conical surface 5 is 35 m.
m, effective length L with extra length l3 from the maximum diameter part being 5 mm
Having a drill body 3 of 50 mm is used.
Further, the conical drill 1 is moved from the reference surface g of the table 18 by 20 degrees.
It is set at a standby position with a height of 5 mm.

From this stand-by position, the conical drill 1 is activated and descends all at once from the reference plane g to a height h immediately before the start of drilling of 44 mm at a rapid traverse speed of 2700 mm / min (3rd speed) (S1), and then Descent speed 450mm / min (1
Speed), the first perforation of the surface material 21 is started while lowering by 10 mm at a rotation speed of 600 rpm (S2). Then, the drilling of the surface material 21 and the drilling of the core material 20 are performed while lowering the conical drill 1 by 32 mm at a descent speed of 720 mm / min (second speed) and a rotation speed of 720 rpm (S3).
Descent speed 450mm / min (1st speed), rotation speed 600rpm
The surface material 21 on the back surface is pierced while being lowered by 10 mm at m (S4). Next, the conical drill 1 was moved downward at a speed of 720 m.
The perforation of the front surface material 21 on the back surface is enlarged while lowering the speed by 27 mm at a rotational speed of 720 rpm at a speed of 720 rpm (S5).
) And then at a descent speed of 450 mm / min (1st speed)
mm to lower the drill body 1 from the reference plane g to the effective length L.
The hole 22 is completely formed in the heat insulating panel 17 by protruding only through the hole (S6). When the drilling is completed, the conical drill 1 is raised to the standby position at a speed of 2700 mm / min (3
(S7).

FIG. 5 is a graph showing the change over time of the processing speed of the conical drill 1 in a graph. When the thickness of the core material 20 of the heat insulating panel 17 is large, the processing speed (falling speed) is increased to 720 mm / min as shown by a virtual line in FIG. Is also good. When the surface material 21 of the heat insulating panel 17 is made of stainless steel, the rotation speed of the conical drill 1 is set to, for example, 204 rpm.
The speed may be set to a low speed. Further, the height of the conical drill 1 is detected by a pulse encoder provided in the feed mechanism 16 of the drilling device 9.

In the conical drill 1 configured as described above, the cutting portion 6 is formed facing the conical surface 5 of the conical drill body 3 having the cutting edge 2 at the tip in the rotation direction, and the conical drill is formed. Since a plurality of notched grooves 7 are formed on the surface 5, even if the workpiece has a multilayer structure having different hardnesses, it can be continuously drilled.
It is suitable for perforating the heat insulating panel 17 in which the surface 0 is covered with a surface material 21 made of a harder material. That is, when a hole is formed in the heat insulating panel 17, the surface material 2 is conventionally used.
What required two steps of cutting and drilling the core material 20 can be easily performed in one step,
Productivity can be improved and equipment costs can be reduced.

Further, since the cutting portion of the workpiece is cut while constantly moving a part of the continuous blade portion 6, unlike the hole saw, the temperature rise of the blade portion 6 is small, and the deterioration of the blade portion 6 and Seizure with the surface material does not easily occur, and durability can be improved. By the way, the conical drill 1 did not need to be replaced for 18 months, while the hole saw had to be replaced in a few days.
Furthermore, according to the above-mentioned conical drill 1, since chips are not continuously generated, and are cut and discharged in a short time, the chips do not dance and damage the surface material. Is easy.

According to the drilling method, the cutting edge 2 drills the surface material 21 using the conical drill 1 having the above-described configuration .
The processing speed until the cutting is increased,
Since the heat insulating panel 17 is perforated at a speed lower than the processing speed of the perforation of the core material 20, the heat insulating panel 17 can be continuously perforated without imposing a load on the blade portion 6, and productivity can be improved. .

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the present invention. For example, in the embodiment, two blade portions 6 are formed on the conical surface 5 of the drill body 3, but one or three or more blade portions 6 may be formed. Further, a notch processing groove 7 is formed in the conical surface 5 of the drill body 3 horizontally in the circumferential direction.
The notched groove 7 may be formed spirally at an appropriate pitch angle.

The shape of the composite panel itself is not limited to a flat panel as illustrated, but may be any other suitable panel such as a corrugated panel having irregularities formed on one or both sides of the panel.

[0024]

As described above, the composite of the present invention
According to the panel drilling method , the cutting portion is formed facing the rotation direction on the conical surface of the conical drill body having a cutting edge at the tip, and a plurality of notch grooves are formed on the conical surface. the Rukoto using cone drill, covering also a multilayer structure having different workpiece hardnesses continuously can be drilled, especially the surface of the core material at the surface material of the material harder than this It is suitable for perforating composite panels that have conventionally required two steps of cutting the surface material and drilling the core material, but can be easily performed in one step,
Productivity can be improved and equipment costs can be reduced. Also,
Since the cutting part of the workpiece is cut while constantly moving a part of the continuous blade part, unlike the hole saw, the temperature rise of the blade part is small, deterioration of the blade part and seizure with the surface material occur Difficult to improve durability (withstand about 20 months of use)
Can be achieved. Further, when the surface material is made of a metal plate, the generated chips are in the form of short cutting chips, so that the cutting operation is easy and quick, and the processing of the cutting chips themselves becomes easy. Also,
Using the conical drill with the above configuration, the surface material is
The processing speed until drilling is increased by the above-mentioned blades.
In addition, since the composite panel is perforated at a speed lower than the processing speed of the perforation of the core material, the composite panel can be continuously perforated without imposing a load on the blade portion, and productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a conical drill according to the present invention .

FIG. 2 is a plan view of the conical drill as viewed from the tip.

FIG. 3 is a side view of the punching device.

FIG. 4 is a diagram for explaining a perforation method when perforating a heat insulating panel using a conical drill.

FIG. 5 is a graph showing a time change of a processing speed in the drilling method.

FIG. 6 is a view for explaining a conventional method of perforating a heat insulating panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conical drill 2 Cutting edge 3 Drill body 5, 5 'Conical surface 6, 6' Blade part 7, 7 'Notch groove 17 Heat insulation panel (composite panel) 20 Core material 21 Surface material

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23B 51/00

Claims (1)

(57) [Claims] 1. A method for piercing a composite panel, wherein one or both surfaces of a core material is covered with a surface material made of a material harder than the core material, a conical drill body having a cutting edge at a tip, and a cone of the drill body. using a blade portion formed to face the direction of rotation in the plane, the conical drill and a plurality formed notching groove at predetermined intervals in the axial direction is formed along the circumferential direction on the conical surface, said surface Material until the above-mentioned cutting edge is pierced.
The speed is controlled by increasing the drilling by the blade and by drilling the core.
A method for perforating a composite panel , wherein the composite panel is perforated at a speed lower than a hole processing speed .