JP5937925B2 - Trimming method of composite material molding using milling tool - Google Patents

Description

  The present invention relates to a trimming method for trimming a molded article made of a fiber reinforced resin composite material using a milling tool such as an end mill, and more particularly to a trimming method capable of effectively suppressing peeling of a fiber layer of the molded article.

  In recent years, fiber reinforced resin composite materials (hereinafter abbreviated as “composite materials” where appropriate) have been widely used in fields where metal materials have been used. For example, a carbon fiber reinforced type (generally referred to as carbon fiber reinforced plastic (CFRP)) formed by impregnating a carbon fiber (carbon fiber) as a reinforcing fiber material and impregnating it with a matrix resin material containing an epoxy resin or the like. ) Is widely used in fields such as sports equipment, industrial machines, vehicles (automobiles and bicycles), aerospace and the like because it is lighter and stronger than metal materials.

  A typical manufacturing process of a molded article made of a composite material (hereinafter referred to as “composite material molded article” as appropriate) will be described. First, a plurality of prepregs (a sheet made of reinforcing fiber material is impregnated with a matrix resin material, etc.) The resulting laminate is cured by pressurization and heating with an autoclave (pressure kettle), and the periphery of the resulting cured product is cut (trimmed) into a predetermined shape. To do.

  Here, as a specific method for trimming the cured product, for example, a water jet process or a cutting method using an end mill is known. For example, in the case of an aircraft composite material molding, trimming is performed by water jet processing because there are many free-form surfaces for the parts that make up the wings, and the parts that make up the fuselage part have complicated cross-sectional shapes. Therefore, trimming by water jet processing is difficult, and trimming is performed using an end mill.

  By the way, since composite materials generally use two kinds of different materials, that is, a reinforcing fiber material and a matrix resin material, they are often inferior in workability compared to a single material such as metal. For example, a carbon fiber, which is a typical reinforcing fiber material, has a surface layer having hardness close to that of diamond, so that the tool is easily worn and the tool life is likely to be shortened. Also, when using a rotary tool such as an end mill, if the rotational speed is increased excessively, the matrix resin material softens or melts, causing problems such as quality degradation on the finished surface, or if the feed speed is increased, the upper and lower edges Problems such as separation of the fiber layer at the part may occur.

  Therefore, conventionally, a technique for suppressing or preventing the above-described problem by optimizing the processing conditions when cutting a composite material using a milling tool such as an end mill is known. For example, Patent Document 1 is not limited to trimming, but has excellent machining surface accuracy (finished surface quality) by optimizing the deflection accuracy, rotation speed, and feed rate of a single blade of an end mill tool. However, a technique that enables efficient cutting while disclosing the above is disclosed.

Japanese Patent No. 3377665

  However, the technique disclosed in Patent Document 1 is a technique that is substantially specialized in an air static pressure spindle, and is described as being applicable to cutting of a fibrous organic material including a composite material. However, the only material that has been verified in the examples is wood. That is, the technique disclosed in Patent Document 1 is optimized for use in cutting wood substantially by using an aerostatic spindle equipped with an end mill-like tool, and is directly applied to cutting of a composite material. It is not always possible.

  Further, as is apparent from the manufacturing process described above, a general composite material has a multilayer structure, but wood does not necessarily have a multilayer structure. Therefore, in the technique disclosed in Patent Document 1, fibers at the edge portion are used. Layer peeling cannot be effectively suppressed. Actually, in Patent Document 1, although there is a description that the “peeling” of the processed surface is large regarding the problem, there is no description about the fibrous organic material having a multilayer structure. In particular, in an aircraft, since the carbon fiber used in the composite material has high strength, even if the composite material molded product for aircraft is trimmed using the technique disclosed in Patent Document 1, high accuracy and high quality are obtained. It is difficult to obtain a composite material molded product.

  The present invention has been made to solve such a problem, and when trimming a composite material molded product using a milling tool such as an end mill, the separation of the fiber layer at the edge portion is particularly effective. An object of the present invention is to provide a trimming method that can be suppressed or prevented.

  In order to solve the above-mentioned problem, the trimming method for a composite material molded product according to the present invention is composed of a fiber-reinforced resin composite material using a milling tool that is a rotary tool having a cutting edge at least on the outer peripheral surface. A trimming method for trimming the periphery of a molded product, wherein the surface side of the periphery of the molded product is cut downward with respect to the surface by the milling tool, and then the back surface side of the periphery of the molded product is The milling tool is configured to cut upward with respect to the surface.

  According to the above configuration, when the surface side is cut downward during trimming, the milling tool cuts the composite material molded product in a direction in which the fiber layer of the molded product is pressed. Therefore, peeling of the fiber layer at the edge portion near the surface can be effectively suppressed or prevented. In addition, when the back side is cut upward after the surface is cut, the cutting direction of the milling tool is the direction to wind up from the back side toward the intermediate layer portion of the composite material molded product. Since the fiber layer is overlapped on both surfaces of the intermediate layer portion, it does not peel off like the edge portion even if a force is applied in the winding direction. Therefore, the fiber layer does not peel at the edge portion near the back surface or the intermediate layer portion.

  In addition, the ability to suppress or prevent the fiber layer from peeling off can increase trimming efficiency by increasing the feed rate (feed amount per unit time) of the milling tool as a result. Furthermore, since the increase in the feed rate also reduces the rubbing distance between the milling tool and the fiber layer, wear of the milling tool can be suppressed and the tool life can be extended.

  In the trimming method of the composite material molded product, the milling tool is cylindrical, and is an end mill tool having a cutting edge on the outer peripheral surface and a bottom blade connected to the cutting edge on a tip surface, a disk shape, A metal saw tool having a plurality of projecting blades on the outer peripheral surface, and a circular cap-shaped portion that expands at the front end side, and the bottom blade that has the cutting blade on the outer peripheral surface of the cap-shaped portion and is connected to the cutting blade. What is necessary is just the structure which is either the dovetail milling tool which has in the front end surface of a shape part.

  In the trimming method of the composite material molded article, when the milling tool is the end mill tool, the end mill tool is previously placed in a state where the end mill tool is tilted so that the front end surface is in contact with the trimmed portion of the molded article. Move to the set forward direction and cut the surface side downward with the bottom edge of the tip surface, and move in the reverse direction of the forward direction and cut the back side upward with the bottom edge Any configuration can be used.

  In the trimming method of the composite material molded article, when the milling tool is the end mill tool, the end mill tool is set in a forward direction set in advance in a state where the end mill tool is raised with respect to the surface of the molded article. In the inclined state, it is moved in the forward direction or the opposite direction, and the outer peripheral blade cuts the surface side of the molded product downward, and in the inclined direction, the forward direction or the reverse direction What is necessary is just the structure which is moved to and cuts the back surface side of the said molded article upwards with the said outer periphery blade.

  In the trimming method of the composite material molded product, when the milling tool is the metal saw tool, the metal saw tool is moved in a preset forward direction so that the surface side of the molded product faces downward. What is necessary is just the structure which is moved to the reverse direction of the said forward direction, and cuts the back surface side of the said molded product upwards while cutting.

  Further, in the trimming method of the composite material molded product, when the milling tool is the dovetail milling tool, the dovetail milling tool is arranged so that the outer peripheral edge of the cap-shaped portion abuts the molded product. While tilting, move in the forward direction set in advance to cut the surface side of the molded product downward and move in the reverse direction of the forward direction to cut the back side of the molded product upward. Any configuration may be used.

  Moreover, in the trimming method of the composite material molded product, as the dovetail milling tool, it is sufficient that a clearance angle is formed on the bottom edge of the tip surface, and a preferable shape thereof is, for example, A mortar shape in which the tip surface is recessed from the outer peripheral edge toward the center can be exemplified.

  In the trimming method of the composite material molded product, the molded product may be a component made of a fiber reinforced resin.

  Furthermore, in the present invention, the periphery of the molded article composed of the fiber reinforced resin composite material is cut with the surface side facing downward with respect to the surface, and then the back surface side is cut upward with respect to the surface. A milling tool used for trimming, having a circular cap-shaped portion whose front end is widened, and having a cutting edge on the outer peripheral surface of the cap-shaped portion and a bottom blade connected to the cutting blade. It is a dovetail milling tool provided on the tip surface of the cap-shaped portion, and further includes a milling tool having a clearance angle formed on the bottom blade of the tip surface.

  As described above, the present invention provides a trimming method capable of effectively suppressing or preventing separation of a fiber layer particularly at an edge portion when trimming a composite material molded product using an end mill. There is an effect that it is possible.

(A) is a schematic diagram which shows an example in the case of cutting down the surface side of a composite material molded object with a milling tool in the trimming method which concerns on this invention, (b) is a milling tool on the back side. It is a schematic diagram which shows an example in the case of cutting upward by (c), and (c) is a schematic diagram which shows an example in the case of cutting upward the surface side of a composite material molded object with a milling tool in the conventional trimming method. is there. (A) is a schematic diagram which shows an example in the case of cutting down the surface side of a composite material molded object with an end mill tool in the trimming method which concerns on Embodiment 1 of this invention, (b) is a back surface side. It is a schematic diagram which shows an example in the case of cutting upward. (A) is a schematic diagram which shows an example in the case of cutting down the surface side of a composite-material molded object downward with an end mill tool in the trimming method which concerns on Embodiment 2 of this invention, (b) is a back surface side. It is a schematic diagram which shows an example in the case of cutting upward. (A) is a schematic diagram which shows an example in the case of cutting down the surface side of a composite material molded object with a metal saw tool in the trimming method which concerns on Embodiment 3 of this invention, (b) is a back surface side. It is a schematic diagram which shows an example in the case of cutting upward. It is a schematic side view which shows typically an example of the structure of a dovetail milling tool used for the trimming method which concerns on Embodiment 4 of this invention. (A) is a schematic diagram which shows an example in the case of cutting down the surface side of a composite-material molding by the dovetail milling tool shown in FIG. 5, and (b) is the case of cutting back side up It is a schematic diagram which shows an example.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment 1)
The present invention is a trimming method in which when the periphery of a composite material molded product is trimmed with a milling tool, the front surface side around the composite material molded product is cut downward and the back surface side is cut upward.

[Composite material molding]
If the composite material molded product (hereinafter simply referred to as “molded product”) to be trimmed in the present invention is composed of a fiber reinforced resin composite material (hereinafter simply referred to as “composite material”), The specific configuration is not particularly limited. A typical example is a molded product having a multilayer structure in which a plurality of fiber layers are laminated. However, the present invention is not limited to this, and the fiber layer may be a single layer such as a nonwoven fabric in which short fibers are randomly entangled. It may be a layer. The composite material is formed by impregnating a reinforcing fiber material with a matrix resin material and then cured and molded. If the molded product has a multilayer structure, the composite material is configured by laminating a plurality of fiber layers made of reinforcing fiber materials. become.

  The specific kind of the reinforcing fiber material is not particularly limited, and a fiber material known in the composite material field can be suitably used. Specifically, for example, organic fibers such as polyester fibers, nylon fibers, aramid fibers, PBO (polyparaphenylene benzobisoxazole) fibers; carbon fibers, boron fibers, glass fibers, silica fibers (quartz fibers), silicon carbide Examples thereof include inorganic fibers such as (SiC) fibers. These fiber materials may be used alone, or may be used by appropriately combining a plurality of types of fiber materials. A particularly preferred example is carbon fiber.

  As long as the reinforcing fiber material constituting the molded article forms a fiber layer as described above, the specific structure of the fiber layer is not particularly limited. In the field of composite materials, sheets (or fabrics) such as braids, woven fabrics, knitted fabrics, and nonwoven fabrics composed of the fiber materials are generally used.

  The specific structure of the matrix resin material impregnated in the reinforcing fiber material is not particularly limited, and examples thereof include a resin composition containing a thermosetting resin. The specific structure of the thermosetting resin contained in the matrix resin material is not particularly limited, and a resin known in the field of composite materials can be suitably used. Specific examples include an epoxy resin, a bismaleimide resin, a vinyl ester resin, an unsaturated polyester resin, a phenol resin, and a silicone resin. These resins may be used alone or in combination of a plurality of types as appropriate. Further, the more specific chemical structure of these thermosetting resins is not particularly limited, and may be a polymer in which various known monomers are polymerized or a copolymer in which a plurality of monomers are polymerized. . Further, the average molecular weight, the structure of the main chain and the side chain, etc. are not particularly limited. Further, the resin contained in the matrix resin material may be another resin such as a thermoplastic resin.

  In addition to the resin, the matrix resin material may contain a known curing agent, curing accelerator, reinforcing material or filler other than the fiber base material, and other known additives. The specific types and compositions of these additives such as curing agents and curing accelerators are not particularly limited, and those of known types or compositions can be suitably used. Furthermore, a known thermoplastic resin may be contained in a known composition depending on the physical properties required for the molded product.

  A method of molding a molded product using the reinforcing fiber material and the matrix resin material is not particularly limited, and a known molding method can be suitably used. As a typical example, a prepreg made by impregnating a matrix resin material into a sheet made of a reinforcing fiber material to make a semi-cured state is manufactured in advance, and the prepreg is laminated so as to have a predetermined shape. And a molding method of heating and pressure curing.

  In addition, the specific configuration of the prepreg, the lamination conditions, and the various conditions such as the curing conditions (temperature, pressure, etc.) are not particularly limited, and various known conditions can be applied according to the type or use of the molded product. . The number of fiber layers contained in the molded product is not particularly limited, but is generally about 20 to 25 layers. In this case, the thickness of the molded product is, for example, about 5 mm.

  The molded product to be trimmed in the present invention is composed of the composite material described above and is not particularly limited as long as it is molded by the molding method as described above, and sports goods, industrial machines, vehicles (Cars, bicycles, etc.), aerospace and the like may be used. A particularly preferred application for applying the present invention is a component made of fiber reinforced resin. For example, aircraft parts made of fiber reinforced resin generally use fibers having higher strength than other fields, and therefore the present invention can suppress or prevent the peeling of the fiber layer at the edge portion in the manufacturing process. Can be suitably used.

[Milling tools and trimming equipment]
The milling tool used in the present invention may be a rotary tool having a plurality of cutting edges on at least the outer peripheral surface, and the “milling tool” in the present invention is used not only for various milling tools but also for lathes and the like. A cutting tool (bite) or a cutter tool rotating in a disk shape is also included.

  Examples of milling tools particularly preferably used in the present invention include end mill tools, metal saw tools, dovetail milling tools, and the like. As such a milling tool, various commercially available tools or tools standardized by industrial standards such as JIS can be suitably used. Moreover, it does not specifically limit about the material of this tool, a dimension, and other conditions, A well-known condition can be selected according to various conditions, such as a kind of molded object, a shape.

  The trimming device used in the present invention is not particularly limited, and any known multi-axis control can be used as long as trimming can be performed using a milling tool such as the above-described end mill tool, metal saw tool, dovetail milling tool or the like. A processing machine, a machining center, etc. can be used conveniently.

[Trimming method]
Next, a typical example of the trimming method according to the present invention will be specifically described with reference to FIGS. 1 (a) to 1 (c) and FIGS. 2 (a) and 2 (b).

  As shown in FIG. 1 (a), the trimming method of the molded product according to the present invention first cuts the surface 20a side around the molded product 20 downward with a milling tool, and thereafter, FIG. 1 (b). As shown in FIG. 2, the back surface 20b side around the molded product 20 is cut upward with a milling tool.

  An end mill tool, which is a typical milling tool, has a cutting edge (outer peripheral edge) on the outer peripheral surface thereof. The cutting blade may be a straight blade provided along the longitudinal direction of the end mill tool, but may be a spiral blade having a twist angle. When trimming the molded product 20 using such an end mill tool in the same manner as when processing a metal material, as shown in FIG. 1 (c), the edge (on the surface 20a side of the molded product 20) At the end portion, as indicated by an arrow D in the figure, the cutting with the cutting edge 10a of the milling tool is directed upward, and the direction in which the fiber layer 21 is wound up is increased. Thereby, as shown to the arrow P in a figure, force is applied in the direction which peels the fiber layer 21. FIG.

  On the other hand, in this invention, as shown to the arrow D of Fig.1 (a), a milling tool is used so that the cutting blade 10a may cut down with respect to the surface 20a. Thus, if the cutting edge 10a penetrates into the surface 20a of the molded product 20 by cutting downward, the fiber layer 21 is cut as shown by the arrow P in the figure. Therefore, peeling of the fiber layer 21 at the edge portion in the vicinity of the surface 20a can be effectively suppressed or prevented.

  After the front surface 20a of the molded product 20 is cut downward, the back surface 20b side is cut upward by the cutting edge 10a as in the conventional case, as indicated by an arrow D in FIG. In this case, as indicated by an arrow P in the figure, the cutting with the cutting edge 10a applies a force in the direction of winding from the back surface 20b toward the intermediate layer portion of the molded product 20. Since the fiber layer 21 is overlapped on both surfaces of the intermediate layer portion, even if a force is applied in the winding direction, the intermediate layer portion does not peel off like the edge portion. Therefore, the fiber layer 21 does not peel off at the edge portion or the intermediate layer portion near the back surface 20b.

  Thus, the ability to suppress or prevent the fiber layer 21 from peeling off can increase the feed rate (feed amount per unit time) of the milling tool as a result and improve trimming efficiency. Furthermore, since the increase in the feed rate also reduces the rubbing distance between the cutting edge 10a and the fiber layer 21, wear of the cutting edge 10a can be suppressed, and as a result, the tool life of the milling tool is extended. It becomes possible. In particular, if the reinforcing fiber material is carbon fiber, the surface layer has a hardness close to that of diamond, so that the tool life is likely to be shortened when the rubbing distance is long. However, according to the present invention, the carbon fiber reinforced composite material ( Even in the case of CFRP), a reduction in tool life can be effectively suppressed.

  A more specific example of the above trimming method will be described. In the present embodiment, for example, as shown in FIGS. 2A and 2B, an end mill tool 11 is used as a milling tool, and the end mill tool 11 is arranged along the spreading direction of the surface 20 a of the molded product 20. Trimming in the down position. In the figure, R indicates the rotation direction of the end mill tool 11, and in the present embodiment, the end mill tool 11 rotates in a clockwise direction when the tip is viewed from the root of the tool.

  The end mill tool 11 has a cylindrical shape and has an outer peripheral blade 11a (a straight blade in the example shown in FIGS. 2A and 2B) on the outer peripheral surface, and a bottom blade 11b connected to the outer peripheral blade 11a on the tip surface ( It is a known configuration possessed on the bottom surface. In the example shown in FIGS. 2 (a) and 2 (b), the outer peripheral edge 11a may be twisted to the left when the tip is on the lower side, and the bottom blade 11b is provided radially on the tip surface. However, other shapes may be used.

  The typical end mill tool 11 can include those specified in JIS B0172-4201-4205 and the like. As a more specific example, a diamond coat end mill manufactured by Mitsubishi Materials Corporation, trade name: DF-4JC. (Source: “2011-2012 General Catalog Turning Tools Milling Tools Drilling Tools”, Mitsubishi Materials Corporation).

  In the present embodiment, the end mill tool 11 is tilted and the tip surface is trimmed toward the periphery of the molded product 20, so that the bottom blade 11b (bottom blade) on the tip surface (bottom surface) is used for trimming. In FIG. 2A, as indicated by symbol G1 in the figure, the direction toward the front of the paper is the forward feed direction, and while rotating the end mill tool 11 tilted in this feed direction, The surface 20a side is cut downward with respect to the surface 20a by the blade 11b. Thereafter, as indicated by symbol G2 in FIG. 2B, the feed direction is set to the reverse direction (the direction toward the back of the paper surface), the rotation direction R remains the same as the forward direction, and the tilted end mill tool 11 is rotated and moved. However, the back surface 20b side is cut upward with respect to the front surface 20a by the bottom blade 11b of the front end surface.

  In this embodiment, the state where the end mill tool 11 is tilted is a state along the spreading direction of the surface 20a of the molded product 20, that is, a horizontal direction as shown in FIGS. 2 (a) and 2 (b). However, the present invention is not limited to this state, and any state may be used as long as the tip end surface thereof is brought into contact with the trimming portion of the molded product. Therefore, the end mill tool 11 may be in a state of falling down in the horizontal direction, or in a state of falling down slightly inclined from the horizontal direction. In other words, the state in which the end mill tool 11 is tilted can be appropriately set according to trimming conditions such as the specific shape of the bottom blade 11b and the specific shape of the peripheral end surface of the molded product 20.

(Embodiment 2)
In the first embodiment, a general end mill tool 11 is used as a milling tool, and the end mill tool 11 is tilted and trimmed by using the bottom edge 11b on the tip surface. In the second embodiment, the same applies. Although the end mill tool 11 is used, trimming is performed using the outer peripheral blade 11a in a state where the end mill tool 11 is standing without being tilted. An example of the trimming method according to the present embodiment will be specifically described with reference to FIGS.

  As shown in FIG. 3 (a), in the present embodiment, the end mill tool 11 is moved in a preset forward direction while being inclined with respect to the surface 20a of the molded product 20, and thereby the surface The 20a side is cut.

  3A shows a state in which the end face on the near side of the molded product 20 is trimmed, and the right side (block arrow G1 direction) in the figure is the forward feed direction, and the end mill tool 11 is Inclined in the forward direction. Further, the rotation direction R of the end mill tool 11 is also a clockwise direction when viewed from the root, as in the first embodiment. The end mill tool 11 is rotationally moved in the forward direction in the state where it is tilted in this way, and the surface 20a side of the molded product 20 is cut downward by the outer peripheral blade 11a.

  Further, in the present embodiment, as shown by a dotted block arrow G2 in FIG. 3A, when the surface 20a side of the molded product 20 is cut, the feed direction of the end mill tool 11 is reversed instead of the forward direction. You may make it a direction. As the feed direction of the end mill tool 11, preferred forward and reverse preferred directions can be appropriately selected according to various conditions.

  Thereafter, as shown in FIG. 3B, the feed direction remains the forward direction (block arrow G1 direction) and the rotation direction R remains the forward direction, except that the inclination direction of the end mill tool 11 is reversed. While the end mill tool 11 is rotated and moved, the back surface 20b side of the molded product 20 is cut upward by the outer peripheral blade 11a.

  Here, the feed direction of the end mill tool 11 when cutting the back surface 20b side of the molded product 20 is not necessarily limited to the forward direction, similar to the feed direction when cutting the front surface 20a side described above, As shown by a dotted block arrow G2 in FIG. As the feeding direction, a preferable forward and reverse direction can be appropriately selected according to various conditions.

  The inclination angle of the end mill tool 11 can be appropriately set according to trimming conditions such as the specific shape of the outer peripheral blade 11b and the specific shape of the peripheral end surface of the molded product 20, and is not particularly limited.

(Embodiment 3)
In the first and second embodiments, trimming is performed using a general end mill tool 11 as a milling tool, but in the third embodiment, a disc-shaped metal saw tool is used. An example of the trimming method according to the present embodiment will be specifically described with reference to FIGS. 4 (a) and 4 (b).

  As shown in FIGS. 4A and 4B, the metal saw tool 12 is disk-shaped and has a plurality of protruding blades 12a on the outer peripheral surface. Note that the number of protruding blades 12a, the protruding amount (length of the cutting edge), and the like are not particularly limited, and are appropriately set according to various conditions such as the material of the molded product 20 and the surrounding state of the molded product 20. The typical metal saw tool 12 can include those defined in JIS B0172-4112. As a more specific example, a full slot cutter (trade name: F2052 P2S90N or F2052 P3T90N, manufactured by OSG Corporation) Zigzag Blade) (Source: “Milling Tool 2011-2012” Catalog, OSG Corporation).

  At the time of trimming, as shown in FIG. 4 (a), the metal saw tool 12 is rotated and moved in the feed direction in the forward direction (the direction toward the front of the paper indicated by symbol G1 in FIG. 4 (a)). The surface 20a side of 20 is cut downward. At this time, the rotation direction R of the metal saw tool 12 is also a clockwise direction when viewed from the root, as in the first or second embodiment. Thereafter, as shown in FIG. 4B, the feed direction is set to the reverse direction (the direction toward the back of the paper surface indicated by symbol G2), the rotation direction R remains the same as the forward direction, and the metal saw tool 12 is rotated in the reverse direction. It is moved and the back surface 20b side of the molded product 20 is cut upward.

  According to the present embodiment, as in the first or second embodiment, peeling of the fiber layer 21 at the edge portion can be suppressed or prevented during trimming, trimming efficiency can be improved, and the tool life can be extended. In addition, the removal rate of the composite material can be reduced during trimming. Therefore, waste of the composite material can be reduced when the molded product 20 is manufactured. In addition, since the number of protruding blades 12a can be increased or decreased, the tool life can be extended by increasing the number of protruding blades 12a, for example, and a longer life can be achieved than the end mill tool 11. .

  In Embodiment 1 or 2, since a cylindrical milling tool is used, trimming of any of a linear shape, a convex shape, and a concave shape can be suitably handled. In the embodiment, since the disk-shaped metal saw tool 12 is used, the linear shape and the convex shape trimming can be suitably handled, but the concave shape trimming, the concave shape dimension, the steepness of the curve, etc. Depending on the situation, it may not be possible to fully respond.

(Embodiment 4)
In the first or second embodiment, a cylindrical milling tool is used, and in the third embodiment, a disk-shaped milling tool is used. However, in the fourth embodiment, the tip side is large in a shade shape. An open dovetail milling tool is used. An example of the trimming method according to the present embodiment will be specifically described with reference to FIGS. 5 and 6A and 6B.

  As shown in FIG. 5, the dovetail milling tool 13 has a circular cap-shaped portion 13 a whose front end widens, an outer peripheral blade 13 b on the outer peripheral surface of the cap-shaped portion 13 a, and the tip of the cap-shaped portion 13 a. The surface has a bottom blade 13c connected to the outer peripheral blade 13b. This outer peripheral blade may be a straight blade or a spiral blade, similar to the outer peripheral blade 11a of the end mill tool 11 of the first embodiment. Moreover, although the bottom blade 13c should just be radial, another shape may be sufficient as it. Thus, the dovetail milling tool 13 has a shape in which the end side of the end mill tool 11 is opened in a “mushroom shape”.

Here, as shown in FIG. 5, it is preferable that the front end surface of the dovetail milling tool 13 is configured in a mortar shape that is recessed from the outer peripheral edge toward the center. Further, it is preferable that a first clearance angle θ ₁ (second angle) and a second clearance angle θ ₂ (third angle) are formed on the bottom blade 13c provided on the tip surface. The specific angles of the first clearance angle θ ₁ (second angle) and the second clearance angle θ ₂ (third angle) are not particularly limited, and should be set within a suitable range according to cutting conditions and the like. Can do. Further, the second clearance angle θ ₂ (third angle) may not be present. Therefore, in the dovetail milling tool 13, it is sufficient that a clearance angle is formed on the bottom edge of the tip surface, and the specific configuration of the clearance angle is not particularly limited.

  Specific examples of the dovetail milling tool 13 include those defined in JIS B0172-4225. As a more specific example, MA Ford Mfg. Co., Inc. SERIES 50 Back Taper (Source: “MA FORD CUTTING TOOLS” 1994 catalog).

  At the time of trimming, as shown in the upper diagram of FIG. 6A, the dovetail milling tool 13 is tilted so that the outer peripheral edge of the cap-shaped portion 13a contacts the molded product 20 (around the feed direction). The surface 20a of the molded product 20 while being rotated and moved in the forward direction (the direction toward the front of the paper surface indicated by the symbol G1 in the upper diagram of FIG. 6A). Cut side down. At this time, the rotation direction R of the dovetail milling tool 13 is also a clockwise direction when viewed from the root, as in the first to third embodiments.

  Thereafter, as shown in the upper diagram of FIG. 6 (b), the feed direction is the reverse direction (the direction toward the back of the paper surface indicated by symbol G2), and the same inclined state as in the forward movement (around the feed direction) The rotation direction R remains the same as the forward direction, and the dovetail milling tool 13 is rotated in the reverse direction, and the back surface 20b side of the molded product 20 is cut upward.

  Here, as shown in the upper diagrams of FIGS. 6A and 6B, the dovetail milling tool 13 further tilts the outer peripheral edge so as to abut against the molded product 20, and further, the surface 20 a of the molded product 20. In the direction of arrow D around the normal line direction H (direction perpendicular to the surface 20a), it is slightly rotated so as to have an angle α as shown in the lower diagrams of FIGS. It is preferable. Thereby, peeling of the fiber layer 21 can be more effectively suppressed or prevented.

  The specific value of the angle α is not particularly limited. In the upper diagrams of FIGS. 6A and 6B, the direction of the arrow D is the normal vector direction (with reference to the normal H of the surface 20a of the molded product 20). If the clockwise direction (clockwise) when viewed in the direction from the bottom to the top of FIG. 6A is positive, and the negative direction when the direction of the arrow D is counterclockwise (counterclockwise), When cutting the surface 20a side, as shown in the lower diagram of FIG. 6A, the angle α is minus (α <0) (in other words, the angle α is made counterclockwise). When the rotation state is set and the back surface 20b side is cut, as shown in the lower diagram of FIG. 6B, the angle α is positive (α> 0) (in other words, the angle α is clockwise). It is sufficient to set the rotation state so that

  As described above, when the rotation of the angle α is given, even if the tip surface of the dovetail milling tool 13 is configured in a mortar shape that is slightly recessed from the outer peripheral edge toward the center, the bottom blade of the tip surface is provided. It is necessary to cut even 13c. Therefore, the tip surface of the dovetail milling tool 13 does not have to be configured in a concave mortar shape. When the feed directions G1 and G2 for trimming are not constant as shown in FIG. 6 and change (for example, when the trimming shape is a curve), the angle α = 0 with respect to the instantaneous feed direction. Even so, it is necessary to perform cutting with the bottom blade 13c on the tip surface.

  Of course, cutting is possible even in the state where the angle α = 0, but in order to more effectively suppress or prevent the peeling of the fiber layer 21, the dovetail milling tool 13 is not only inclined but also rotated at the angle α. Is preferred. As an example of the angle α, for example, α = ± 10 ° can be mentioned, but the angle α is not limited thereto, and can be set within a suitable range according to cutting conditions and the like.

  6 (a) and 6 (b) show the molding 20 and the dovetail groove for convenience of explaining the rotation direction R, the rotation state forming the angle α, and the feed direction G1 or G2 when the dovetail milling tool 13 is trimmed. The milling tool 13 is shown in a schematic positional relationship. Therefore, at the time of actual trimming, the dovetail milling tool 13 only needs to be positioned so as to satisfy the above-described condition with respect to the molded product 20, and is schematically illustrated in FIGS. 6 (a) and 6 (b). Needless to say, the positional relationship is not limited.

  According to the present embodiment, as in the first to third embodiments, peeling of the fiber layer 21 at the edge portion can be suppressed or prevented, the trimming efficiency can be improved, and the tool life can be extended. . Moreover, in the present embodiment, by using the dovetail milling tool 13, the removal rate of the composite material can be suppressed by performing trimming with the cap-shaped portion 13a, and the concave shape trimming with a relatively large radius can be performed. Can also be suitably handled.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely and suitably used in the field of trimming a molded product made of a fiber reinforced resin composite material such as CFRP.

10a Cutting edge 11 (for milling tool) End mill tool 11a Peripheral cutting edge (cutting edge on outer peripheral surface)
11b Bottom blade 12 Metal saw tool 12a Protruding blade 13 Dovetail milling tool 13a Shade 20 Composite material molded product 20a Front surface 20b Back surface 21 Fiber layer

Claims (5)

A trimming method for trimming the periphery of a molded article made of a fiber reinforced resin composite material using a milling tool that is a rotary tool having a cutting edge at least on the outer peripheral surface,
The milling tool is a cylindrical shape, and is an end mill tool having a cutting edge on the outer peripheral surface and a bottom edge connected to the cutting edge on a tip surface,
The end mill tool is moved in a forward direction set in advance in a state where its tip surface is brought into contact with the trimming portion of the molded product, and the surface around the molded product is formed by the bottom blade of the tip surface. After cutting the side down to the surface,
The end mill tool is moved in the reverse direction of the forward direction, and the back surface around the molded product is cut upward with respect to the surface by the bottom blade.
Trimming method for composite material molding. A trimming method for trimming the periphery of a molded article made of a fiber reinforced resin composite material using a milling tool that is a rotary tool having a cutting edge at least on the outer peripheral surface,
The milling tool is a cylindrical shape, and is an end mill tool having a cutting edge on the outer peripheral surface and a bottom edge connected to the cutting edge on a tip surface,
The end mill tool is moved in the forward direction or the reverse direction in a state where the end mill tool is tilted in a forward direction set in advance with respect to the surface of the molded product, and the cutting edge on the outer peripheral surface moves the After cutting the surface side around the molded product downward with respect to the surface,
The end mill tool is moved in the forward direction or the reverse direction while being inclined in the reverse direction, and the back surface around the molded product is cut upward with respect to the surface by the cutting edge of the outer peripheral surface. It is characterized by
Trimming method for composite material molding. A trimming method for trimming the periphery of a molded article made of a fiber reinforced resin composite material using a milling tool that is a rotary tool having a cutting edge at least on the outer peripheral surface,
The milling processing tool has a circular cap-shaped portion with a widened tip side, and has the cutting edge on the outer peripheral surface of the cap-shaped portion and has a bottom blade connected to the cutting blade on the tip surface of the cap-shaped portion. A dovetail milling tool,
The dovetail milling tool is in an inclined state in which the outer peripheral edge of the cap-shaped portion is in contact with the molded product, and is further viewed in the vector direction of the normal line with respect to the normal line of the surface of the molded product. While rotating in a counterclockwise direction to form an angle α, moving in a preset forward direction, cutting the surface side of the molded product downward,
While moving the dovetail milling tool in the inclined state, and further in a rotating state that forms an angle α in the clockwise direction when viewed in the vector direction of the normal line, move it in the reverse direction of the forward direction, The back side of the molded product is cut upward,
Trimming method for composite material molding. The dovetail milling tool is characterized in that a clearance angle is formed on the bottom edge of the tip surface,
A method for trimming a composite material molded product according to claim 3. The method for trimming a composite material molded product according to any one of claims 1 to 4, wherein the molded product is a part made of fiber reinforced resin.

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