The present invention relates to a reamer and a hole processing method.
There is a case that a reamer is used to finish the shape of a hole formed in a work material.
In relation to the above, Patent Literature 1 (Japanese Patent No. 2,724,120) discloses a reamer for processing a composite material. The Patent Literature 1 discloses forming channels which are twisted in a direction opposite to a predetermined rotational direction, as being brought closer to a tip portion; forming to a blade section, a scratching section in which an external diameter increases more from the tip portion of the blade section toward a shank section, and a back-tapered section whose outer diameter is decreased at the rate of 0.05 to 0.25 mm/100 mm from the scratching section toward the shank section; forming a margin section having the width of 0.05 and 0.20 mm in adjacent to a direction opposite to the outer blade of the scratching section; and providing a clearance surface between 20 and 30°, following the margin section. It is described in the Patent Literature 1 that by employing such a structure, a cutting resistance of a reamer for processing the composite material can be preferably reduced, that a finished surface is not made rough, and that chips generated from the scratching section are discharged in a front direction, namely, the tip direction of the reamer.
[Patent literature 1] Japanese patent No. 2,724,120
By the way, a reamer is sometimes used which discharges a cut liquid.
When the blade section 106 is twisted in the opposite direction, as shown in Patent Literature 1 and
For the purpose of suppressing the generation of burrs, it could be considered to change the direction in which the blade section 106 extends.
However, in an example shown in
Therefore, the present invention may provide a reamer and a hole processing method in which the generation of burrs can be suppressed and the hole having a desired hole diameter can be attained.
The reamer according to the present invention includes a column section rotating around a central line in a predetermined rotation direction; a blade section provided on an outer surface of the column section and extending while being twisted in a direction to upper-cut; a cut liquid flow passage provided in said column section to introduce a cut liquid into the cut liquid flow passage; and an outlet group formed on the outer surface of the column section and connected with said cut liquid flow passage. The cut liquid flow passage extends such that the cut liquid is discharged from the outlet group toward a back portion of the reamer.
According to this invention, even if the work material includes a metal plate, the generation of burrs can be restrained, because the blade section is formed such that upper-cutting is performed.
In addition, the cut liquid is discharged from the outlet group for the back portion of the reamer. That is, chips and the cut liquid are discharged to the same direction (the direction for the back portion). Therefore, the discharge of the chips is never hindered by the cut liquid, and the reamer is never clogged with the chips. The hole of the work material is prevented from being unnecessarily cut with the chips so that the desired hole diameter can be attained.
The hole processing method according to the present invention includes rotating a reamer; and processing a hole formed previously in a work material, by using the rotating reamer. The reamer includes a column section; and a blade section provided on an outer surface of the column section and extending while being twisted. The rotating a reamer includes rotating the reamer in a direction in which upper-cutting is performed. The processing includes introducing a cut liquid inside the column section; and discharging the introduced cut liquid from the outer surface of the column section for the back portion.
According to the present invention, the reamer and the hole processing method are provided in which the generation of burrs can be suppressed and the good finishing shape can be obtained.
Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
A reamer according to an embodiment of the present invention is used to finish the shape of a hole formed in a work material. A case that a main wing member of an aircraft is employed as the work material will be described in the present embodiment.
The work material will be described before the reamer will be described.
As shown in
The structure of the reamer according to the present embodiment will be described below.
As shown in
The column section 6 configures a main body section of the reamer 5 and is columnar. In the column section 6, a back portion of the reamer is coupled to a rotating mechanism (not shown). The rotating mechanism allows the column section 6 to be rotated around a central axis c in a rotational direction shown in
The plurality of blade sections 7 are formed on the side of the column section 6. The respective blade sections 7 are twisted to be oriented in the same direction as the rotational direction, as the respective blade sections 7 come closer to a tip portion of the reamer. That is, the respective blade sections 7 are twisted to in a forward direction.
The cutting fluid flow passage 9 is a portion into which a cutting fluid is introduced, and formed inside the column section 6. On the other hand, outlets of the group 8 are formed to discharge the introduced cutting fluid and provided for the channels 12.
Subsequently, a method of processing a hole according to the present embodiment will be described.
As shown in
In this case, in the present embodiment, the blade section 7 is twisted in the forward direction. Thus, the inner wall of the hole 3 is cut so that upper cutting is performed, and chips 11 are generated on the back portion side of the blade section 7. The generated chips 11 are guided along the channels 12 toward the back portion of the reamer 5 and discharged. In this way, since the hole 3 is worked so that the upper cutting is performed, the metal plate 2 is prevented from being pushed to the movement direction in a surface portion (portion A in
In addition, in the present embodiment, the cutting fluid 10 is discharged toward the back portion of the reamer. A discharge direction of the cutting fluid 10 is the same as the discharge direction of the chips 11. Thus, the cutting fluid 10 does not prevent the discharge of the chips 11. The channel 12 is prevented from being clogged with the chips 11, and the shape of the hole 3 can be finished to have a desirable hole diameter.
It should be noted that the present embodiment has been described by using a case where the metal plate 2 is permanently put between the first composite material plate 1-1 and the second composite material plate 1-2 in the work material. In this case, the work material cannot be disassembled as mentioned above. Thus, when the burrs are generated in the metal plate 2, the burrs cannot be removed. Therefore, the suppression of the burrs is strongly requested. The reamer 5 according to the present embodiment can be preferably applied to the work material in that the generation of the burrs can be prevented. However, the work material to which the reamer 5 according to the present embodiment is applied is not limited to this type of work material. In case that the metal plate is included in the work material, there is a possibility that the burrs are generated at the time of processing. When the burrs are generated in the metal plate, a work for removing the burrs is required. Therefore, when a work material including a metal plate is used as the work material, the use of the reamer 5 according to the present embodiment suppresses the generation of the burrs, and the work for removing the burr can be eliminated.
Subsequently, an experimental result by the inventor will be described to show the present embodiment in more detail.
As a comparison example 1, a reamer in which the blade sections 7 extends while being twisted in an opposite direction was prepared. Also, a twist angle of the blade section was set to 30°.
The reamer according to the comparison example 1 was rotated in the rotation speed of 200 rpm to process a hole formed in the metal plate of the work material. It should be noted that a flow quantity of the cutting fluid was set between 15 and 17 ml/min. Also, a feeding speed (a movement speed of the reamer) was set to 0.05 mm/rev. After the processing, the height of the burr generated in the metal plate was measured.
As an example 1, the reamer in which the blade sections 7 extended while being twisted in the forward direction was prepared. Also, the twist angle of the blade section was set to 10°. Also, in the reamer, the cutting fluid flow passage and the outlet group were formed such that the cutting fluid was discharged toward the back portion of the reamer. The other structures were made similar to those of the comparison example. The reamer according to the example 1 was used to process the hole formed in the work material under the same condition as in the comparison example. After the processing, the height of the burr generated on the metal plate was measured.
As an example 2, the reamer in which the twist angle of the blade section was 30° was prepared. The other structures were similar to those of the example 1. The reamer according to this example 2 was used to process the hole formed in the work material under the same condition as in the comparison example. After the processing, the height of the burr generated on the metal plate was measured.
As the example 3, the reamer in which the twist angle of the blade section was 45° was prepared. The other structures were similar to those of the example 1. The reamer according to this example 3 was used to process the hole formed in the work material under the same condition as in the comparison example. After the processing, the height of the burr generated on the metal plate was measured.
When the comparison example 1 and the example 2 are compared, it could be understood that the example 2 is lower in the height of the burr. That is, it is confirmed that the twist direction of the blade section was set to the forward direction, and the cutting fluid was discharged to the back side, so that the generation of the burrs can be suppressed.
Also, when the examples 1 to 3 are compared, it could be understood that the height of the burrs are further suppressed as the twist angle becomes larger. Also, in the twist angle of 30° or less, the burr having the height of 0.2 mm or more was confirmed to be generated. However, when the composite material plate was included in the work material, and the twist angle exceeds 50°, there was a case that fuzz was generated in a portion of the composite material plate. Thus, from the viewpoint of suppressing the fuzz, the twist angle is preferred to be 50° or less. That is, the twist angle is preferred to be 30° or more from the viewpoint of suppressing the generation of the burr and preferred to be 50° or less from the viewpoint of suppressing the fuzz.
This application claims a priority on convention based on Japanese Patent Application No. JP 2010-252316 filed on Nov. 11, 2010. The disclosure thereof is incorporated herein by reference.
Number | Date | Country | Kind |
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2010-252316 | Nov 2010 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2011/075679 | 11/8/2011 | WO | 00 | 4/4/2013 |