JP2008119762A - Drilling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling method capable of easily performing desired boring without resulting in a large drop of the strength or a loss of the outside appearance even if a workpiece is a laminate consisting of a resin reinforced with fibers. <P>SOLUTION: Before a through hole 14 is formed in the laminate 10 structured so that sheets 16-19 of a resin reinforced with continuous fibers F are laminated, a grinder 22 is used to remove the facial layer around the part to be bored of the surface 19a of the resin sheet 19 as located on the side opposite to the surface 16a of the resin sheet 16 as the side face where a drill 12 is to be inserted, so as to form a facial layer removed portion 24, and then boring is conducted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drilling method for making a through hole in a laminate in which a resin reinforced with fibers is laminated.

  For example, various members constituting a vehicle body of an automobile are fastened to other members by forming a through hole in the mounting portion and inserting a bolt into the through hole.

  As a drilling method for forming the through hole, Patent Document 1 uses a drill with a deburring function that can remove a back burr (a burr generated on the opposite side of the drill insertion side) after drilling. It is described that drilling and deburring of steel are continuously performed.

JP 2003-231011 A

  By the way, many materials other than metals are used in automobiles and the like. In particular, a resin reinforced with continuous fibers (fiber reinforced resin, FRP) is widely used for bonnets, roofs, and the like because of its light weight and high strength. Even in a molded product in which this type of fiber reinforced resin is laminated and molded, it is generally fastened with bolts so that it can be assembled to other parts. Therefore, a cutting tool such as a drill in secondary processing after molding. Drilling using is done.

  An example of a method for drilling such a fiber reinforced resin using a drill will be described with reference to FIGS. 7A to 7D.

  A laminate 100 shown in FIG. 7A is a molded product formed by laminating a plurality of sheets made of a resin reinforced with continuous fibers. In this case, four fiber reinforced resin sheets 102 to 105 are laminated. , Molded.

  First, as shown in FIG. 7A, drilling is started by a drill 110 from the upper surface side of the laminate 100, that is, the surface 102a side of the uppermost fiber reinforced resin sheet 102. The drill 110 advances while gradually penetrating from the fiber reinforced resin sheet 102 to the fiber reinforced resin sheets 103 and 104 (see FIG. 7B).

  Then, when the drilling of the lowermost fiber reinforced resin sheet 105 starts, as shown in FIG. 7C, peeling occurs between the fiber reinforced resin sheet 105 and the upper fiber reinforced resin sheet 104 (interlayer). Then, the peeling progresses gradually. Eventually, during the drilling of the fiber reinforced resin sheet 105, the fiber reinforced resin sheet 105 is divided from the through hole 112 and falls off linearly (see FIG. 7D). That is, the continuous fibers constituting the lowermost fiber reinforced resin sheet 105 are not cut by the outer diameter cutting edge of the drill 110 but are bent and pulled in the axial direction of the drill 110, and as a result, the peeling or cracking occurs. It will be.

  This also occurs in a laminate in which a resin reinforced with fibers that are discontinuous, that is, cut and has a certain length or more, is laminated. That is, discontinuous fibers of a certain length or more constituting the lowermost fiber reinforced resin sheet 105 are not cut by the outer diameter outer blade of the drill 110 but are pushed or bent in the axial direction of the drill 110. As a result, the fiber reinforced resin sheet is pulled, and as a result, the peeling or cracking occurs. In addition, an unpleasant phenomenon such as fiber rising occurs. As a matter of course, the above-mentioned peeling or cracking appears more noticeably in a laminate in which a resin reinforced with continuous fibers is laminated.

  As described above, in the drilling process for a molded product made of a laminate of this type of fiber reinforced resin, unlike the drilling process on a metal that usually causes burrs on the back side, the side opposite to the drill insertion side In some cases, surface peeling or cracks based on the periphery of the hole to be processed may occur. In this case, in the case of a continuous fiber, even the inner part of the molded product is pulled by the fiber, and as a result, the surface layer part of the laminate is peeled off linearly along the fiber. Furthermore, when the fibers are peeled off in a straight line, there is a problem in that a portion having a linearly reduced strength is generated in the laminate, and the appearance of the molded product is impaired.

  The present invention has been made in consideration of the above problems, and even in a laminate in which a resin reinforced with fibers is laminated, desired drilling can be easily performed without causing a significant decrease in strength and loss of appearance. An object is to provide a drilling method that can be performed.

  The drilling method according to the present invention is a drilling method of making a through hole in a laminate in which a fiber reinforced resin is laminated, and before the drilling, drilling on the opposite side to the insertion side of the drilling tool in the laminate. The surface layer part around the part is removed.

  Further, the drilling method according to the present invention is a drilling method of drilling a through hole in a laminate in which a resin reinforced with continuous fibers is laminated, and before drilling, the insertion side of the drilling tool in the laminate and The surface layer around the perforated part on the opposite side is removed.

  In such a method, by removing the surface layer portion in advance before drilling, the fibers contained in the surface layer portion are broken. Thereby, the resin which is substantially the lowest layer in the portion corresponding to the removed surface layer portion can be supported by another resin or the resin itself which is the lowest layer. Therefore, the peeling that occurs in the resin as the lowermost layer is very slight, and the appearance of the laminate is hardly affected.

  Furthermore, the drilling method according to the present invention is a method of drilling a through hole in a laminate in which a fiber reinforced resin is laminated, and before the drilling, the side opposite to the insertion side of the drilling tool in the laminate. A sticking agent is applied to the surface layer portion around the perforated portion.

  Furthermore, the drilling method according to the present invention is a drilling method for making a through hole in a laminate in which a resin reinforced with continuous fibers is laminated, and before the drilling, the insertion side of the drilling tool in the laminate is provided. A sticking agent is applied to the surface layer around the perforated part on the opposite side.

  In such a method, the resin as the lowermost layer of the laminate can be supported by the fixing agent. As a result, since the fixing material becomes a substantially lowermost layer in the drilled portion, the resin constituting the lowermost layer of the laminate needs only a very small amount of peeling and has almost no effect on the appearance of the laminate. It does not occur. Furthermore, the reinforcement effect | action of the through-hole periphery part by the said sticking agent can also be aimed at.

  In addition, in the case where at least three or more layers of the resin are stacked, the laminate is between the second layer resin that is the upper layer of the lowermost resin and the third layer resin that is the upper layer. And peeling between the lowermost layer resin and the second layer resin can be effectively prevented.

  According to the present invention, by removing in advance the surface layer portion on the side opposite to the insertion side of the drilling tool before drilling, drilling is performed in a state where the resin that is substantially the lowest layer is supported by another resin or the like. It can be performed.

  Further, according to the present invention, the hole forming process can be performed in a state where the fixing material is substantially the lowermost layer in the drilling portion by supporting the resin which is the lowermost layer of the laminate with the fixing agent. it can.

  Therefore, the peeling that occurs at the time of drilling is minimal, and there is almost no influence on the appearance of the laminate. Furthermore, since the fibers are not peeled off in a straight line, the desired through hole can be easily formed without significantly reducing the strength of the laminate.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a drilling method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partially omitted perspective view showing a state in which drilling is performed on a laminated body 10 of fiber reinforced resin by a drilling method according to the first embodiment of the present invention. The drilling method according to the first embodiment is a method of drilling through holes 14 using a drill 12 in a laminate 10 in which a plurality of sheets made of a resin (fiber reinforced resin) reinforced with continuous fibers F are laminated. It is. Of the sheets constituting the laminate 10, several sheets may be made of a resin reinforced with discontinuous fibers of a certain length or more, or may be a resin reinforced with discontinuous fibers, Alternatively, a resin reinforced with continuous fibers may be used. In the case of this embodiment, the laminate 10 is a molded product in which a plurality of fiber reinforced resin sheets are laminated and formed into a desired shape, and the through-hole 14 is inserted through a bolt, for example. It is an attachment hole for attaching a molded product to another member.

  Hereinafter, the drilling method according to the first embodiment will be described by exemplifying a case where a drilling process is performed on the laminate 10 in which four fiber reinforced resin sheets which are resins reinforced by continuous fibers (FRP) are stacked. .

  As shown in FIG. 1, the laminate 10 is a molded product in which four fiber reinforced resin sheets 16 to 19 are laminated.

  FIG. 2 is a schematic perspective view illustrating the fiber reinforced resin sheet 16 as a fiber reinforced resin sheet to which the drilling method of the present invention can be suitably applied. As shown in FIG. 2, the fiber reinforced resin sheet 16 is impregnated with resin in which fibers F continuous from one end to the other end of the sheet are arranged in one direction (for example, the direction of arrow A in FIG. 2). , Hardened and molded. Any fiber may be selected as the fiber F, and examples thereof include glass fiber, carbon fiber, polyacrylonitrile fiber, pitch fiber, cellulosic fiber, rayon, and other polymer fibers. Moreover, what is necessary is just to select arbitrary resin as said resin which is a matrix, For example, an epoxy resin, a phenol resin, a polyester resin, a vinyl ester resin, and another thermosetting resin or a thermoplastic resin is mentioned. In this case, a mixture of a plurality of resins may be used to improve physical properties.

  Next, a drilling method according to the first embodiment will be described with reference to FIGS. 3A to 3E. In addition, what is necessary is just the laminated body of the resin reinforced with the fiber as a processed product which can apply the drilling method of this invention suitably. In this case, the laminate may be a laminate in which a resin reinforced with discontinuous resin is laminated, and the effect of the laminate in which the resin reinforced with continuous fibers is laminated is more remarkable. Needless to say, a resin reinforced with other than the above fibers may be used.

  In this drilling method, after the surface layer portion around the drilling portion on the side opposite to the insertion side of the drill 12 is removed, drilling is performed with the drill 12. The drill 12 is inserted while making a hole from the surface (upper surface) 16 a side of the fiber reinforced resin sheet 16, which is the uppermost layer (fourth layer) of the laminate 10, into the laminate 10.

  That is, first, in order to remove the surface layer portion, the surface layer portion is removed by the grinder 22 from the surface (lower surface) 19a side of the fiber reinforced resin sheet 19 which is the lowermost layer (first layer) of the laminate 10 ( (See FIG. 3A). Thereby, in the desired range around the perforated part where the through hole 14 on the surface 19a side is to be formed, a part of the fiber reinforced resin sheet 19 is removed as a surface layer part, and a surface layer removal that is a substantially cylindrical recess Part 24 is formed.

  The depth of the surface layer removal portion 24 is preferably the thickness of the fiber reinforced resin sheet 19, that is, one layer of the laminate 10, because the subsequent workability and finished state are further improved. It can be appropriately set to two layers, 0.5 layers, or the like.

  The range (inner diameter) of the surface layer removing portion 24 may be set slightly larger than the outer diameter of the drill 12 (inner diameter of the through hole 14). For example, when the outer diameter of the drill 12 is about 3 to 5 mm, What is necessary is just to set to 4-7 mm etc. In addition, when the range of the said surface layer removal part 24 is smaller than the outer diameter of the drill 12, since the drill 12 contacts this surface layer removal part 24, it is unpreferable, and when too larger than the outer diameter of the drill 12, the laminated body 10 It may cause a decrease in strength.

  Although the said grinder 22 consists of a structure which rotates a cylindrical grindstone at high speed and scrapes off the said surface layer part, you may use the milling machine which has a blade part on an outer periphery and an end surface in addition to this, for example. In short, as long as a predetermined part of the surface layer portion of the laminate 10 can be removed, the grinder 22 can be used.

  Next, as shown in FIG. 3B, drilling with a drill 12 is started from the surface 16 a side of the uppermost (fourth layer) fiber reinforced resin sheet 16. The drill 12 proceeds while forming a through hole 14 in the laminated body 10, penetrates the fiber reinforced resin sheet 16, and then penetrates the lower layer (third layer) of the fiber reinforced resin sheet 17.

  Thereafter, as shown in FIG. 3C, the tip of the drill 12 reaches the upper surface of the fiber reinforced resin sheet 18 as the second layer. The fiber reinforced resin sheet 18 is substantially the lowermost layer (first layer) at a portion corresponding to the surface layer removing portion 24.

  Therefore, the drilling process for the fiber reinforced resin sheet 18 as the third layer is started, and as shown in FIG. 3D, the surface layer removal of the fiber reinforced resin sheet 18 is performed immediately before the drill 12 penetrates the fiber reinforced resin sheet 18. In the part corresponding to the part 24, the separation starts between the upper layer of the fiber reinforced resin sheet 17 (interlayer). That is, immediately before the cutting edge of the drill 12 passes through the fiber reinforced resin sheet 18, the strength of a part of the fiber reinforced resin sheet 18 is extremely reduced, and this part is not cut by the outer diameter cutting edge of the drill 12 and is axially cut. By bending, the fiber F is pulled and peeling is caused.

  As the drill 12 advances, the peeling further progresses, and when the drill 12 completely penetrates the fiber reinforced resin sheet 18, the peeled portion of the fiber reinforced resin sheet 18 is inside the surface layer removing portion 24. It will be in the state which drooped somewhat (refer FIG. 3E). However, as can also be seen from FIG. 3E, the part that peels and hangs down is only a very small part corresponding to the surface layer removal unit 24, and is the most similar to the conventional method shown in FIG. 7D. The lower layer does not peel off and fall off.

  As described above, in the drilling method according to the first embodiment, the surface layer removing portion 24 is formed in the lowermost layer of the laminate 10 by the grinder 22, so that the fiber reinforced resin sheet 19 that is the lowermost layer is formed. The fiber F can be preliminarily broken at a portion included in the surface layer removing portion 24. For this reason, most of the fiber reinforced resin sheet 18 of the second layer, which is substantially the lowermost layer at the portion corresponding to the surface layer removing portion 24, is supported by the fiber reinforced resin sheet 19.

  Therefore, the second-layer fiber reinforced resin sheet 18 corresponding to the surface layer removing portion 24 is peeled off very locally, and the appearance of the laminate 10 as a molded product is hardly affected. Moreover, since the continuous fiber F does not peel off linearly, the strength of the laminate 10 is sufficiently maintained. In this case, when the depth of the surface layer removing portion 24 is, for example, 0.5 layer, the lowermost fiber reinforced resin sheet 19 is supported by the fiber reinforced resin sheet 19 itself, and Similar effects can be obtained.

  In addition, when fastening the laminated body 10 in which the through-hole 14 was formed with the drilling method which concerns on this 1st Embodiment to another member, as shown, for example in FIG. 4, the fiber reinforcement which is the lowest layer The fastening target member 26 may be brought into contact with the surface 19 a of the resin sheet 19, and the bolt 28 may be inserted into the through hole 14 and fastened together with the nut 30. In this case, since the fiber reinforced resin sheet 18 is peeled off and the surface layer removing portion 24 is hidden inside the fastening portion, there is no problem in appearance. Moreover, since the range of the said peeling part and the surface layer removal part 24 is a little larger than the through-hole 14, the problem on fastening strength can also be fully avoided.

  Next, a drilling method according to a second embodiment of the present invention will be described with reference to FIGS. 5A to 5D and FIG.

  5A to 5D are partially abbreviated cross-sectional views for explaining a procedure for drilling a fiber reinforced resin laminate 10 by the drilling method according to the second embodiment of the present invention. FIG. 6 is a partially omitted cross-sectional view illustrating a state in which the laminated body 10 in which the through holes 14 are formed is fastened to other members by the drilling method according to the second embodiment. In FIGS. 5A to 5D and FIG. 6, the same reference numerals as those shown in FIGS. 1 to 4 indicate the same or similar configurations, and thus have the same or similar functions and effects. Detailed description is omitted.

  In this drilling method, a sticking agent is applied to the surface layer around the drilled portion on the opposite side to the insertion side of the drill 12, and then drilling is performed with the drill 12.

  That is, first, the adhesive 32 is applied as a fixing agent to the surface 19 a of the fiber reinforced resin sheet 19 that is the lowermost layer of the laminate 10. The adhesive 32 is preferably one that dries and solidifies after application (see FIG. 5A). As a result, a new layer of the adhesive 32 that is fixed can be formed in a desired range around the hole where the through hole 14 on the surface 19a side is to be formed. In addition to the adhesive agent 32, the adhesive agent may be any material that can solidify after application and can exert a force capable of fixing the cut fiber F. Examples thereof include a sealer.

  The application thickness of the adhesive 32 may be a thickness that can sufficiently support the fiber reinforced resin sheet 19 from the surface 19a side, for example, about 0.2 to 1 layer of the laminated body 10. It can be appropriately set in consideration of the characteristics (adhesiveness) between the agents 32.

  The application range (outer diameter) of the adhesive 32 may be set slightly larger than the outer diameter of the drill 12 (inner diameter of the through hole 14), as in the case of the surface layer removing portion 24. When the diameter is about 3 to 5 mm, it may be 4 to 7 mm. In the case of the second embodiment, since the surface layer portion of the laminate 10 is not removed as in the case of the first embodiment, the application range of the adhesive 32 is larger than that of the drill 12. As long as it is not small, there is no problem even if it is somewhat large. However, if it is too large, the appearance of the molded product is impaired, and attachment to other members is hindered.

  Next, as shown in FIG. 5B, drilling with the drill 12 is started from the surface 16 a side of the uppermost fiber reinforced resin sheet 16. The drill 12 proceeds while forming the through hole 14 in the laminated body 10, penetrates the fiber reinforced resin sheet 16, and then continuously penetrates the fiber reinforced resin sheets 17 and 18 thereunder.

  Thereafter, drilling of the lowermost fiber reinforced resin sheet 19 is started. As shown in FIG. 5C, immediately before the drill 12 penetrates the fiber reinforced resin sheet 19, the fiber reinforced resin sheet 19 and the adhesive 32 Peeling will begin between (interlayer). That is, immediately before the cutting edge of the drill 12 passes through the fiber reinforced resin sheet 19, the strength of a part of the fiber reinforced resin sheet 19 is extremely lowered, and this part is not cut by the outer diameter cutting edge of the drill 12 and is axially cut. By bending, the fiber F is pulled and peeling is caused.

  However, in the case of the second embodiment, the periphery of the through hole 14 in the surface 19a of the fiber reinforced resin sheet 19 is supported by an adhesive 32 that has been applied and solidified in advance. For this reason, only the very small part needs to be peeled off, and when the adhesive 32 is penetrated by the further progress of the drill 12, the formation of the through hole 14 is completed. Therefore, also in this case, unlike the conventional method shown in FIG. 7D, the lowermost layer is not largely peeled off and dropped off.

  As described above, in the drilling method according to the second embodiment, after the fiber reinforced resin sheet 19 that is the lowermost layer of the laminate 10 is supported by the adhesive 32, the drilling process is performed by the drill 12. Therefore, the upper layer of the adhesive 32, which is a substantially lowermost layer in the punched portion, that is, the fiber-reinforced resin sheet 19 is peeled off only locally and has an influence on the appearance of the laminate 10 as a molded product. There is almost no. Moreover, since the continuous fiber F of the fiber reinforced resin sheet 19 is not peeled off in a straight line, the strength of the laminated body 10 is sufficiently maintained, and the adhesive 32 further reinforces the peripheral portion of the through hole 14. Will also be planned.

  Moreover, when the laminated body 10 in which the through hole 14 is formed by the drilling method according to the second embodiment is fastened to another member, for example, as shown in FIG. A recess 26 a may be provided on the surface of the fastening target member 26 that contacts the surface 19 a of the resin sheet 19, and the bolt 28 may be inserted into the through hole 14 and fastened together with the nut 30. If it does so, since the application layer of the adhesive agent 32 is accommodated in the said recessed part 26a, the laminated body 10 and the fastening object member 26 can be stuck closely, and the problem on an external appearance does not arise.

  In each said embodiment, the lamination | stacking number of the fiber reinforced resin sheet | seat of the said laminated body 10 is not restricted to 4 sheets, What is necessary is just two or more laminated | stacked, and among several sheets which comprise this laminated body 10, The sheet may be a sheet made of a resin reinforced with discontinuous fibers of a certain length or more, a resin reinforced with discontinuous fibers, or a resin reinforced with continuous fibers. I do not care. In this case, particularly when three or more layers are laminated, it is possible to effectively prevent peeling between the second-layer fiber-reinforced resin sheet and the third-layer fiber-reinforced resin sheet as an upper layer. it can.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is naturally possible to adopt various configurations without departing from the gist of the present invention.

It is a partially-omission perspective view which shows the state which drills in the laminated body of fiber reinforced resin by the drilling method which concerns on the 1st Embodiment of this invention. It is the schematic perspective view which illustrated the fiber reinforced resin sheet which can apply the drilling method of this invention suitably. FIG. 3A is a partially omitted cross-sectional view showing a state where a surface layer portion of a laminate of fiber reinforced resin is removed by the drilling method according to the first embodiment of the present invention, and FIG. 3B is shown in FIG. 3A. FIG. 3C is a partially omitted cross-sectional view showing a state immediately before drilling is performed on the laminate, and FIG. 3C is a partially omitted cross-sectional view showing a state where drilling is performed on the laminate shown in FIG. 3A. FIG. 3D is a partially omitted cross-sectional view showing a state immediately before the drill reaches the surface layer removing portion of the laminate shown in FIG. 3A, and FIG. 3E is a through hole formed in the laminate shown in FIG. 3A. It is a partially-omitted sectional view showing a state. FIG. 3B is a partially omitted cross-sectional view showing a state in which the laminated body with a through hole shown in FIG. 3E is fastened to another member. FIG. 5A is a partially omitted cross-sectional view showing a state in which an adhesive is applied to the surface layer portion of the laminate of fiber reinforced resin by the drilling method according to the second embodiment of the present invention, and FIG. FIG. 5C is a partially omitted cross-sectional view showing a state immediately before drilling is performed on the laminated body shown, and FIG. 5C is a partially omitted cross-sectional view showing a state where drilling is performed on the laminated body shown in FIG. 5A FIG. 5D is a partially omitted cross-sectional view illustrating a state in which a through hole is formed in the stacked body illustrated in FIG. 5A. FIG. 5D is a partially omitted cross-sectional view illustrating a state in which the laminated body having the through holes illustrated in FIG. 5D is fastened to another member. FIG. 7A is a partially omitted cross-sectional view showing a state immediately before performing a drilling process on a fiber reinforced resin laminate by a conventional drilling method, and FIG. 7B shows a drilling process performed on the laminate shown in FIG. 7A. 7C is a partially omitted sectional view showing a state where the drill is further advanced from the state shown in FIG. 7B. FIG. 7D is a partially omitted sectional view showing a state in which the drill is advanced. It is a partially omitted sectional view showing a state in which a through hole is made.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 100 ... Laminated body 12, 110 ... Drill 14, 112 ... Through-hole 16-19, 102-105 ... Fiber reinforced resin sheet 16a, 19a, 102a ... Surface 22 ... Grinder 24 ... Surface layer removal part 32 ... Adhesive F ... fiber

Claims (5)

A method of drilling a through-hole in a laminate in which a resin reinforced with fibers is laminated,
Before drilling, the surface layer part around the drilling part on the opposite side to the insertion side of the drilling tool in the laminate is removed. A method of drilling a through-hole in a laminate in which a resin reinforced with continuous fibers is laminated,
Before drilling, the surface layer part around the drilling part on the opposite side to the insertion side of the drilling tool in the laminate is removed. A method of drilling a through-hole in a laminate in which a resin reinforced with fibers is laminated,
Before drilling, a sticking agent is applied to the surface layer portion around the drilling portion on the opposite side to the insertion side of the drilling tool in the laminated body. A method of drilling a through-hole in a laminate in which a resin reinforced with continuous fibers is laminated,
Before drilling, a sticking agent is applied to the surface layer portion around the drilling portion on the opposite side to the insertion side of the drilling tool in the laminated body. In the drilling method according to any one of claims 1 to 4,
The said laminated body is the drilling method characterized by laminating | stacking the said resin at least 3 layers or more.

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