Layered manufacturing method, layered manufacturing device, and program

Abstract

To provide a lamination-molding method, a lamination-molding device and a program, which enable targeting molding without causing meandering even when using filaments containing twisted continuous reinforcing fiber bundles.SOLUTION: There is provided a lamination-molding method in which a molded object is manufactured by the fused deposition molding using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforcing fiber bundle with resin. The lamination-molding method has a molding step of: feeding the fiber-reinforced resin filament to a head unit 15; heating and melting a fed fiber-reinforced resin filament 11 in the head unit 15; and discharging a melted molding material from a nozzle 15a of the head unit 15 while relatively displacing the head unit 15 and a molding table 17. A speed ratio Vh / Vf between a head speed Vh of the head unit 15 and the molding table 17 in the molding step and a feeding speed Vf of the fiber-reinforced resin filament 11 fed to the head unit 15 is made larger than 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an additive manufacturing method, an additive manufacturing apparatus, and a program. [Background technology]

[0002] Fused Deposition Molding (FDM) is a known method of manufacturing in which a filament, which is the material used for manufacturing, is fed to a head, heated and melted in the head, extruded from a nozzle, and layered on a manufacturing table to form a desired shape. Another proposed FDM additive manufacturing method uses a fiber-reinforced resin filament, which is made by impregnating a twisted continuous reinforcing fiber bundle with resin (Patent Document 1). This method can improve the strength of the molded object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 182675 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when using continuous fiber reinforced resin filaments to create (print) an object, the continuous reinforced fibers in the filament can cause the melted modeling material to meander and prevent it from being printed in a straight line. This can prevent the modeling material from being ejected along the intended path, resulting in voids in the layered object and a loss of strength.

[0005] Therefore, the present invention aims to provide an additive manufacturing method, additive manufacturing device, and program that can produce the desired shape without causing meandering, even when using filaments containing twisted continuous reinforcing fiber bundles. [Means for solving the problem]

[0006] The present invention comprises the following configurations. (1) An additive manufacturing method for producing a shaped object by fused deposition modeling using fiber-reinforced resin filaments obtained by impregnating and twisting continuous reinforced fiber bundles with resin, a modeling process in which the fiber reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber reinforced resin filament is ejected from a nozzle of the head section while moving the head section and a modeling table relative to each other; a speed ratio Vh / Vf between a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, and a feed speed Vf of the fiber reinforced resin filament fed to the head unit, being greater than 1; Additive manufacturing methods. (2) An additive manufacturing device that produces a shaped object by fused deposition modeling using fiber-reinforced resin filaments that are formed by impregnating a continuous reinforced fiber bundle with a resin and twisting the fiber, a filament feeding unit that feeds the fiber reinforced resin filament; a head unit that thermally melts the fed fiber-reinforced resin filament and ejects the molten modeling material from a nozzle; a modeling table having a modeling surface and disposed opposite the head unit; a control unit that discharges the molding material from the head unit while moving the head unit and the modeling table relative to each other; Equipped with the control unit sets a head speed Vh, which is a relative speed between the head unit and the modeling table, to be greater than a feed speed Vf of the fiber reinforced resin filament fed to the head unit. Additive manufacturing equipment. (3) A program for realizing an additive manufacturing function for producing a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a continuous reinforced fiber bundle with resin and giving it a twist, On the computer, a function of a modeling process in which the fiber-reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber-reinforced resin filament is ejected from a nozzle of the head section while the head section and a modeling table are moved relative to each other; A program for realizing the function of making the head speed Vh, which is the relative speed between the head unit and the modeling table in the modeling process, greater than the feed speed Vf of the fiber reinforced resin filament fed to the head. [Effects of the Invention]

[0007] According to the present invention, even when filaments containing twisted continuous reinforcing fiber bundles are used, it is possible to form the desired shape without causing meandering. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of an FDM-type additive manufacturing device. [Figure 2] FIG. 2 is a schematic perspective view of a fiber-reinforced resin filament. [Figure 3] FIG. 3 is an explanatory diagram schematically showing a fiber bundle in which twisting is imparted within the filaments. [Figure 4] FIG. 4 is a side development view of the filament shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The additive manufacturing device shown here is a device that creates objects by fused deposition modeling, and uses fiber-reinforced resin filaments, which are made by impregnating twisted continuous reinforcing fiber bundles with resin, as the manufacturing material.

[0010] <Configuration of additive manufacturing equipment> FIG. 1 is a schematic diagram of an FDM-type additive manufacturing apparatus 100. The additive manufacturing apparatus 100 includes a filament feeder 13 that feeds a fiber reinforced resin filament (hereinafter also referred to as a filament) 11, a head unit 15, a modeling table 17, a molding driver 19, and a controller 21.

[0011] The filament feeding unit 13 includes a pair of drive rollers 13a that sandwich the filament 11, and a drive unit (not shown) such as a motor that rotates and drives at least one of the drive rollers 13a. The head unit 15 has a heating unit (not shown) that thermally melts the fed filament 11, and a nozzle 15a that ejects the molding material melted by the heating unit. Although not shown, the head unit 15 may also be provided with a cutting unit such as a cutter or laser cutting device that cuts the reinforcing fibers contained in the filament 11.

[0012] The modeling table 17 is disposed opposite the nozzle 15a of the head unit 15, and has a modeling surface 17a on which models are stacked. The forming driver 19 moves the head unit 15 and the modeling table 17 relative to each other, and forms the modeling material ejected from the nozzle 15a of the head unit 15 along a desired path. For example, the forming driver 19 may be configured to include a two-axis drive mechanism that moves the head unit 15 within the plane of the modeling surface 17a of the modeling table 17, and an elevation mechanism that adjusts the stacking height by driving the modeling table 17 up and down.

[0013] The control unit 21 has the function of controlling the feeding of the filament by the filament feeding unit 13 and the relative movement of the head unit 15 by the molding drive unit 19, as well as the function of controlling the other units overall. A program that controls the units including the filament feeding unit 13 and the molding drive unit 19 is input to the control unit 21, and by executing the program, an object of a desired shape is additively manufactured. This control unit 21 is composed of a computer that includes a processor such as a CPU, memories such as ROM and RAM, and storage such as a hard disk drive HDD and a solid state drive SSD.

[0014] <Fiber reinforced resin strand> FIG. 2 is a schematic perspective view of the fiber-reinforced resin filament 11. As shown in FIG. The filament 11 is a continuous linear resin material containing reinforcing fibers, which is used as a shaping material for producing a shaped object. The filament 11 has a substrate 31 containing a thermoplastic resin and one or more fiber bundles 33 disposed in the substrate 31 and extending continuously in the axial direction Ax. The fiber bundles 33 are formed by twisting a large number of reinforcing fibers together and bundling them together, and are arranged in a spiral shape by being twisted along the central axis of the filament 11.

[0015] Organic fibers such as polyethylene fiber, aramid fiber, and Zylon fiber, and inorganic fibers such as boron fiber, glass fiber, carbon fiber, metal fiber, and rock fiber can be used as the reinforcing fibers of the fiber bundles 33 that make up the filament 11. Surface-treated fibers can be used as the reinforcing fibers to improve the adhesive strength between the resin and the fibers.

[0016] Examples of the thermoplastic resin contained in the substrate 31 include polyolefin resins such as polypropylene or polyethylene, acrylonitrile-butadiene-styrene resin, polystyrene resin, polyester resins such as polyethylene terephthalate, polybutylene terephthalate or polylactic acid, polyamide resins, aromatic polyamide resins, polyetherimide, polyallyl imide, polyarylate, polyether ether ketone, polyaryl ether ketone, polybenzimidazole, polyethersulfone, polysulfone, polyvinylidene fluoride resin, liquid crystal polymer, polycarbonate resin, polyacetal, and polyphenylene sulfide.

[0017] These thermoplastic resins may be used alone, or may be blends of multiple resins to improve the heat resistance, heat distortion temperature, heat aging, tensile properties, bending properties, creep properties, compression properties, fatigue properties, impact properties, and sliding properties of the thermoplastic resin. Examples of thermoplastic resins include polyether ether ketone resin (PEEK) / polytetrafluoroethylene (PTFE) and PEEK / polybenzimidazole (PBI). Furthermore, the thermoplastic resin may contain short fibers such as carbon fiber and glass fiber, talc, or the like.

[0018] The durability of the molded object may be improved by adding to the thermoplastic resin antioxidants such as phenols, thioethers, and phosphites, ultraviolet absorbers such as benzotriazoles or triazines, and metal deactivators such as hydrazides or amides.

[0019] Adding a plasticizer such as a phthalic acid-based or polyester-based plasticizer to a thermoplastic resin improves flexibility, thereby improving the molding accuracy during molding and the flexibility of the molded object.

[0020] Adding halogen-based, phosphate-based, inorganic, or intumescent flame retardants to thermoplastic resins can improve the flame retardancy of the resulting object.

[0021] Adding a core material such as a phosphate ester metal salt or sorbitol to a thermoplastic resin can control thermal expansion during molding, thereby improving molding accuracy.

[0022] Adding a permanent antistatic agent such as a nonionic, anionic, or cationic agent to a thermoplastic resin can improve the antistatic properties of the molded object.

[0023] By adding a hydrocarbon-based, metal soap-based or other lubricant to the thermoplastic resin to improve the lubricity of the continuous fiber reinforced strand, the strand can be smoothly fed out during molding.

[0024] <Head relative speed and filament feed speed> In the additive manufacturing device 100 having this configuration, the control unit 21 feeds the filament 11 to the head unit 15, and the fed filament 11 is thermally melted in the head unit 15. Then, a modeling process is performed in which the melted modeling material is ejected from the nozzle 15a of the head unit 15 while moving the head unit 15 and the modeling table 17 relative to each other. At this time, the control unit 21 sets the head speed Vh, which is the relative speed between the head unit 15 and the modeling table 17 within the plane of the modeling surface 17a of the modeling table 17, to be greater than the feed speed Vf of the filament 11 fed to the head unit 15, and sets the speed ratio Vh / Vf between the head speed Vh and the feed speed Vf to be greater than 1.

[0025] Here, the head speed Vh is the moving speed of the head unit 15 when the head unit 15 moves within the plane of the printing surface 17a while the printing surface 17a is fixed, but when the head unit 15 and the printing table 17 are moved in cooperation with each other, it is the relative speed between the printing table 17 and the head unit 15. For example, in the case of a printing format in which the head unit 15 is fixed and the printing table 17 moves, the head speed Vh is the relative speed of the printing table 17 with respect to the head unit 15.

[0026] By making the speed ratio Vh / Vf greater than 1, excessive supply of the fiber bundles 33 contained in the filament 11 is suppressed, and the molding material M that is discharged by heating and melting the filament 11 from the nozzle 15a of the head unit 15 is less likely to meander. As a result, molding can be performed according to the set path, preventing the formation of unintended voids in the molded object and suppressing a decrease in the strength of the molded object.

[0027] Furthermore, in the additive manufacturing method for a molded object, by making the speed ratio Vh / Vf greater than 1 and satisfying the additional condition described below, molding can be performed without breaking or damaging (fluffing) the reinforcing fibers in the discharged molding material M. This suppresses fiber breakage and damage (fluffing) in the molded object, and more reliably prevents a decrease in the strength of the molded object.

[0028] The conditions for the speed ratio Vh / Vf will be explained in more detail below. Fig. 3 is an explanatory diagram showing a fiber bundle in which twisting is imparted within the filaments, and Fig. 4 is a development view of the side of the filaments shown in Fig. 3. When the fiber bundle is arranged parallel to the central axis of the filament, the length of the filament is equal to the length of the fiber bundle. However, when the fiber bundle is arranged spirally along the central axis of the filament, the length Lftw of the fiber bundle spirally wound at a position of radius R from the filament center O is longer than the length Ltw of the filament, for the length Ltw of the filament per twist pitch of the fiber bundle. In other words, the length Lftw of the fiber bundle for the length Ltw of the filament per twist pitch can be expressed by equation (1) using the radius R of the filament in accordance with the twist angle α. Lftw=√{Ltw 2 +(2πR) 2} ...Equation (1)

[0029] Furthermore, during modeling, a tensile force may act on the fiber bundle due to solidification of the modeling material M after it is discharged from the nozzle 15a. In this case, the length of the fiber bundle in the filament during modeling is the sum of the original fiber bundle length Lftw and the value εLftw (the deformation length ΔLftw due to tension of the fiber bundle in the filament per twist pitch), which is obtained by multiplying the original fiber bundle length Lftw by the strain ε at the time of breakage of the reinforcing fiber. In other words, the length of the fiber bundle during modeling is the length obtained by multiplying the filament length Ltw by the parameter N shown in equation (2). N=(ΔLftw + Lftw) / Ltw...Equation (2)

[0030] Here, the deformation length ΔLftw is determined from a table or a relational expression that is experimentally or analytically determined in advance from the relationship between the head speed Vh and the filament feed speed Vf. Note that the limit value of the deformation length ΔLftw due to tension may be determined in advance by measuring the elongation until breakage of only the fiber in a tensile test or the like, and using the deformation amount until breakage.

[0031] When the length of the filament is equal to the length of the fiber bundles in the filament, it is desirable to make the head speed Vh and the filament feed speed Vf equal during modeling so that the supply and discharge rates of the modeling material are balanced. However, when the length of the fiber bundles in the filament is longer than the length of the filament, as described above, making the head speed Vh and the filament feed speed Vf equal results in excess fiber bundles in the modeling material that is heated, melted, and discharged from the nozzle of the head unit 15, and this excess fiber bundle causes the path to meander.

[0032] Therefore, by making the speed ratio Vh / Vf between the head speed Vh and the filament feed speed Vf greater than 1, the supply amount of fiber bundles in the molding material M that is heated, melted, and extruded from the nozzle 15a relative to the head speed Vh becomes appropriate, and meandering of the molding path is suppressed.

[0033] Furthermore, by setting the experimentally obtained parameter K shown in formula (3) in the range of 0.985 to 1.030, the heated, melted, and discharged molding material does not meander, and the fiber bundles in the discharged molding material can be molded without breaking. As a result, fiber breakage in the molded object is suppressed, and the strength of the molded object can be improved. K=(Vh / Vf) / {(ΔLftw + Lftw) / Ltw}...Equation (3) The range of the parameter K is preferably 0.990 or more, more preferably 1.000 or more, and is preferably 1.028 or less, more preferably 1.020 or less. The optimum value of the parameter K is 1.

[0034] The speed ratio Vh / Vf is preferably equal to or less than the parameter N in formula (2). In other words, by satisfying formula (4), the difference between the length of the filament and the length of the fiber bundle can be set according to the speed ratio Vh / Vf, thereby optimizing the supply amount of the fiber bundle. Vh / Vf ≦ (ΔLftw + Lftw) / Ltw...Equation (4)

[0035] Furthermore, by making the speed ratio Vh / Vf greater than 1 and setting the parameter K within the above range, the molding material that is heated, melted, and discharged from the nozzle 15a of the head unit 15 does not meander, and molding can be performed without causing damage (fluffing, breakage) to the fiber bundles in the discharged molding material. As a result, fiber damage (fluffing) in the molded object can also be suppressed, and the strength of the molded object is synergistically improved. [Example]

[0036] Table 1 shows the results of modeling using the additive manufacturing device 100 shown in FIG. 1 using filaments with the following properties. (Test conditions) ·filament Fiber bundle reinforcement fiber: 1K carbon fiber Base material: Polyamide resin Filament diameter 0.288mm Twist angle: 2° Filament length per twist pitch Ltw: 25.939mm Fiber bundle length per twist pitch Lftw: 25.954mm Strain at break of reinforcing fiber ε: 0.015 Deformation length due to tension of fiber bundle in filament per twist pitch ΔLftw: 0.389 mm

[0037] [Table 1]

[0038] In Test Examples 1 to 6, the head speed Vh was kept constant when the modeling table was fixed and the head was moved, while the filament feed speed Vf was varied. Under each condition, the presence or absence of meandering, fiber fuzzing, and fiber breakage when the modeling material was modeled into a linear shape was confirmed. The printability was also graded, with a "◎" indicating a good level, a "○" indicating a level with no practical problems, and an "×" indicating a level where at least one of meandering, fuzzing, and fiber breakage occurred after ejection.

[0039] In Test Example 1, the head speed Vh was 5.0 mm / s and the feed speed Vf was 4.98 m / s. In this case, the speed ratio Vh / Vf was 1.005, which is greater than 1. The speed ratio Vh / Vf was also equal to or less than the parameter N in equation (2). The parameter K was 0.989, which was within the aforementioned range of 0.985 to 1.030. Under the conditions of Test Example 1, when linear printing was performed to form the shaping material into a straight line, there was no meandering of the shaping path, and the printability was good.

[0040] In Test Example 2, the feeding speed Vf was reduced to 4.95 mm / s, and the speed ratio Vh / Vf was set to 1.010. This speed ratio Vh / Vf was equal to or less than the parameter N. The parameter K was 0.994. Under the conditions of Test Example 2, similar to Test Example 1, no meandering occurred during linear printing, and good printability was obtained.

[0041] In Test Example 3, the feeding speed Vf was reduced to 4.85 mm / s, and the speed ratio Vh / Vf was set to 1.031. This speed ratio Vh / Vf was greater than the parameter N. The parameter K was 1.015. Under the conditions of Test Example 3, no meandering occurred during linear printing, but the printability was lower than in Test Examples 1 and 2, but this result was not a problem in practical use.

[0042] In Test Example 4, the feeding speed Vf was reduced to 4.80 mm / s, and the speed ratio Vh / Vf was set to 1.042. This speed ratio Vh / Vh was greater than the parameter N. The parameter K was 1.026. Under the conditions of Test Example 4, no meandering occurred during linear printing, but some fiber fluffing occurred. The printability was the same as in Test Example 3, and the results were satisfactory for practical use.

[0043] In Test Example 5, the feeding speed Vf was reduced to 4.75 mm / s, and the speed ratio Vh / Vf was set to 1.053. This speed ratio Vh / Vh was greater than the parameter N. In addition, the parameter K was 1.036, which was outside the aforementioned range of 0.985 or more and 1.030 or less. Under the conditions of Test Example 5, fiber breakage occurred, resulting in a decrease in printability.

[0044] In Test Example 6, the feed speed Vf was set to 5.0 mm / s, the same as the head speed Vh, and the speed ratio Vh / Vf was set to 1.000. This speed ratio Vh / Vh was less than or equal to parameter N. Parameter K was 0.984, which was outside the aforementioned range of 0.985 to 1.030. Under the conditions of Test Example 6, meandering occurred during linear printing, resulting in poor printability.

[0045] From the above results, it was found that meandering during linear printing was suppressed when the speed ratio Vh / Vf was 1 or more, and that printability was improved when the speed ratio Vh / Vf was equal to or less than parameter N. Furthermore, by setting parameter K in the range of 0.985 to 1.030, it was possible to prevent fiber fuzzing and fiber breakage.

[0046] As such, the present invention is not limited to the above-described embodiments, and the present invention also contemplates the mutual combination of the various components of the embodiments, as well as modifications and applications by those skilled in the art based on the description in the specification and well-known techniques, and these modifications and applications are included in the scope of protection sought.

[0047] As described above, the present specification discloses the following: (1) An additive manufacturing method for producing a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, a modeling process in which the fiber reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber reinforced resin filament is ejected from a nozzle of the head section while moving the head section and a modeling table relative to each other; a speed ratio Vh / Vf between a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, and a feed speed Vf of the fiber reinforced resin filament fed to the head unit, being greater than 1; Additive manufacturing methods. According to this additive manufacturing method, the filament is heated and melted and ejected from the nozzle of the head, and the molding material does not meander, allowing the molding to follow the set path. As a result, the formation of voids in the molded object can be suppressed, improving the strength of the molded object.

[0048] (2) The speed ratio Vh / Vf is 0.985≦(Vh / Vf) / {(ΔLftw + Lftw) / Ltw}≦1.030 The additive manufacturing method according to (1), wherein the following relationship is satisfied. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: Fiber bundle length in fiber-reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of fiber bundles in fiber-reinforced resin filaments per twist pitch This additive manufacturing method prevents the heated, melted, and discharged molding material from meandering, and allows for molding without breaking the fiber bundles in the discharged molding material, thereby suppressing fiber breakage in the molded object and improving the strength of the molded object.

[0049] (3) The speed ratio Vh / Vf is Vh / Vf ≦ (ΔLftw + Lftw) / Ltw The additive manufacturing method according to (1) or (2), which satisfies the relationship: Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: Fiber bundle length in fiber-reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of fiber bundles in fiber-reinforced resin filaments per twist pitch According to this layered manufacturing method, the amount of fiber bundle supplied can be further optimized.

[0050] (4) An additive manufacturing device that produces a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, a filament feeding unit that feeds the fiber reinforced resin filament; a head unit that thermally melts the fed fiber-reinforced resin filament and ejects the molten modeling material from a nozzle; a modeling table having a modeling surface and disposed opposite the head unit; a control unit that discharges the molding material from the head unit while moving the head unit and the modeling table relative to each other; Equipped with the control unit sets a head speed Vh, which is a relative speed between the head unit and the modeling table, to be greater than a feed speed Vf of the fiber reinforced resin filament fed to the head unit. Additive manufacturing equipment. With this additive manufacturing device, the control unit adjusts the head speed and filament feed speed, so that the filament is heated and melted and discharged from the nozzle of the head, and the modeling material does not meander, allowing the model to be manufactured along the set path. As a result, the generation of voids in the model can be suppressed, improving the strength of the model.

[0051] (5) A program for realizing an additive manufacturing function for producing a molded object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, On the computer, a function of a modeling process in which the fiber-reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber-reinforced resin filament is ejected from a nozzle of the head section while the head section and a modeling table are moved relative to each other; A program for realizing the function of making the head speed Vh, which is the relative speed between the head unit and the modeling table in the modeling process, greater than the feed speed Vf of the fiber-reinforced resin filament fed to the head unit. According to this program, the filament is heated and melted from the nozzle of the head, and the modeling material is discharged without meandering, allowing the model to be modeled along the set path. As a result, the generation of voids in the model can be suppressed, improving the strength of the model. [Explanation of symbols]

[0052] 11 filaments 13 Filament feeding section 15 Head 15a nozzle 17 Modeling Table 19 Forming drive unit 21 Control section 31 Base material 33 Fiber bundle 100 Additive manufacturing equipment

Claims

1. An additive manufacturing method for producing a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, comprising: a modeling process in which the fiber reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber reinforced resin filament is ejected from a nozzle of the head section while moving the head section and a modeling table relative to each other; a speed ratio Vh / Vf between a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, and a feed speed Vf of the fiber reinforced resin filament fed to the head unit, is set to be greater than 1; The speed ratio Vh / Vf is 0.985≦(Vh / Vf) / {(ΔLftw + Lftw) / Ltw}≦1.030 Satisfy the relationship between Additive manufacturing methods. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

2. An additive manufacturing method for producing a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, comprising: a modeling process in which the fiber reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber reinforced resin filament is ejected from a nozzle of the head section while moving the head section and a modeling table relative to each other; a speed ratio Vh / Vf between a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, and a feed speed Vf of the fiber reinforced resin filament fed to the head unit, is set to be greater than 1; The speed ratio Vh / Vf is Vh / Vf ≦ (ΔLftw + Lftw) / Ltw Satisfy the relationship between Additive manufacturing methods. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

3. An additive manufacturing apparatus that produces a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, a filament feeding unit that feeds the fiber reinforced resin filament; a head unit that thermally melts the fed fiber-reinforced resin filament and ejects the molten modeling material from a nozzle; a modeling table having a modeling surface and disposed opposite the head unit; a control unit that discharges the molding material from the head unit while moving the head unit and the molding table relative to each other; Equipped with the control unit sets a head speed Vh, which is a relative speed between the head unit and the modeling table, to be greater than a feed speed Vf of the fiber reinforced resin filament fed to the head unit; The speed ratio Vh / Vf is 0.985≦(Vh / Vf) / {(ΔLftw + Lftw) / Ltw}≦1.030 Satisfy the relationship between Additive manufacturing equipment. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

4. An additive manufacturing apparatus that produces a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, a filament feeding unit that feeds the fiber reinforced resin filament; a head unit that thermally melts the fed fiber-reinforced resin filament and ejects the molten modeling material from a nozzle; a modeling table having a modeling surface and disposed opposite the head unit; a control unit that discharges the molding material from the head unit while moving the head unit and the molding table relative to each other; Equipped with the control unit sets a head speed Vh, which is a relative speed between the head unit and the modeling table, to be greater than a feed speed Vf of the fiber reinforced resin filament fed to the head unit; The speed ratio Vh / Vf is Vh / Vf ≦ (ΔLftw + Lftw) / Ltw Satisfy the relationship between Additive manufacturing equipment. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

5. A program for realizing an additive manufacturing function for producing a shaped object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with a resin, On the computer, a function of a modeling process in which the fiber-reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber-reinforced resin filament is ejected from a nozzle of the head section while the head section and a modeling table are moved relative to each other; a function of making a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, larger than a feed speed Vf of the fiber reinforced resin filament fed to the head unit; The speed ratio Vh / Vf is 0.985≦(Vh / Vf) / {(ΔLftw + Lftw) / Ltw}≦1.030 A function that satisfies the relationship A program to achieve this. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

6. A program for realizing an additive manufacturing function for producing a molded object by fused deposition modeling using a fiber-reinforced resin filament obtained by impregnating a twisted continuous reinforced fiber bundle with resin, On the computer, a function of a modeling process in which the fiber-reinforced resin filament is fed to a head section, and a modeling material obtained by thermally melting the fed fiber-reinforced resin filament is ejected from a nozzle of the head section while the head section and a modeling table are moved relative to each other; a function of making a head speed Vh, which is a relative speed between the head unit and the modeling table in the modeling process, larger than a feed speed Vf of the fiber reinforced resin filament fed to the head unit; The speed ratio Vh / Vf is Vh / Vf ≦ (ΔLftw + Lftw) / Ltw A function that satisfies the relationship A program to achieve this. Ltw: Length of fiber reinforced resin filament per twist pitch Lftw: fiber bundle length in fiber reinforced resin filament per twist pitch ΔLftw: Deformation length due to tension of the fiber bundle in the fiber reinforced resin filament per twist pitch ε: Strain at the time of fracture of reinforcing fiber

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