JP2013099817A - Method for processing fiber-reinforced composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for processing a fiber-reinforced composite material that can perform trimming and/or punching while keeping high dimensional accuracy by suppressing the generation of burrs and fuzz to a minimum without requiring processing on an end face.SOLUTION: The method for processing a molding body includes steps for: fixing the molded body comprising reinforcing fiber with a mean fiber length of 5-100 mm and thermoplastic resin; and carrying out trimming and/or punching by using cutting edges heated by a temperature kept at 50-200°C. The fixing part for the molded body performs fixing by the pressure of 0.3-100 MPa per unit area of the molded body and falls within a range of 300 mm or smaller relative to a position where the cutting edge touches the molded body.

Description

  The present invention relates to a processing method for trimming and / or punching a molded body comprising at least a reinforcing fiber having an average fiber length of 5 to 100 mm and a thermoplastic resin.

  In recent years, composite materials using carbon fibers, glass fibers, aramid fibers, and the like as reinforcing fibers have been widely used as structural materials for aircraft and the like by utilizing their high specific strength and specific rigidity. These composite materials are often molded from a prepreg, which is an intermediate product in which a reinforcing fiber is impregnated with a matrix resin, through molding / processing steps such as heating, pressing, and shaping.

  In forming and processing fiber reinforced composite materials, cutting and trimming are generally performed after shaping the shape, but the problem is that productivity becomes low and costs increase due to complicated processes. is there. As a means for solving these problems, a trimming and / or punching method using a mold has been proposed. In patent document 1, the same location is repeatedly actuated 2 to 10 times to polish the processed end surface, thereby reducing burrs remaining on the processed end surface and obtaining a molded body with high processing accuracy. However, since it is necessary to operate the punch 2 to 10 times for one processing, the processing cycle tends to be long. Further, since the fiber-reinforced composite material having high rigidity (hard) is processed, there is a problem that when the number of punch operations increases, the punch itself is easily worn and the replacement frequency increases. In Patent Document 2, by heating the mold, shaping and trimming and / or punching can be performed simultaneously, and the amount of burrs can be suppressed. It was difficult to obtain high dimensional accuracy because of heating.

  When the reinforcing fiber is a continuous fiber, the slipping force at the interface between the fiber and the resin hardly causes the fiber to fall out, and burrs, fluff, and cracks are unlikely to occur. In addition, short fibers having a reinforcing fiber of less than 5 mm have a short fiber length, so that cracks do not occur and the fibers fall off but rarely cause burr and fluff. In contrast, in the case of a reinforced fiber having a fiber length of 5 mm to 100 mm, there is a problem that burrs and fluff are generated due to the falling off of the fiber, and that when the reinforcing fiber is pulled out, pulling together with the thermoplastic resin leads to the generation of cracks. is there.

JP 2009-172753 A JP 2011-084038 A

  The present invention minimizes the occurrence of burrs and fluff in a molded article composed of at least an average fiber length of 5 to 100 mm of reinforced fibers and a thermoplastic resin, eliminates the need for end face treatment, and has high dimensional accuracy. A method for processing a fiber-reinforced composite material that can be trimmed and / or punched while maintaining the above is provided.

  In the present invention, trimming and / or punching is performed using a cutting blade heated and kept at 50 ° C. to 200 ° C. while fixing a molded body made of a reinforcing fiber having an average fiber length of 5 to 100 mm and a thermoplastic resin. A method of processing a molded body to be performed, wherein the portion for fixing the molded body is within a range of 300 mm or less based on a portion where the extraction blade contacts the molded body, and per unit area of the molded body. It achieves by the processing method of a molded object characterized by fixing with the pressure of 0.3 Mpa-100 Mpa.

  By using the processing method of the present invention, it is possible to easily obtain a molded body made of a fiber-reinforced composite material with little burrs and fluff at the end and high dimensional accuracy.

It is a schematic diagram of the typical metal mold | die in this invention. It is an example of the specific shape of the extraction blade in this invention. It is the punching shape 1 used in the Example. It is the punching shape 2 used in the Example. This is the punching / trimming shape 3 used in the example.

  The molded body used in the present invention is made of a fiber-reinforced composite material containing at least reinforcing fibers having an average fiber length of 5 to 100 mm and a thermoplastic resin. Then, the molded body is trimmed and / or punched using a cutting blade. At that time, when the molded body is installed in a mold, it suppresses the generation of burrs and the generation of fluff, and also has high accuracy and excellent productivity.

[Reinforcing fiber]
In the present invention, as the reinforcing fiber constituting the fiber-reinforced composite material, for example, inorganic fibers such as carbon fiber, glass fiber and ceramics, metal fiber such as stainless steel fiber, aramid fiber, polyester fiber, nylon fiber, etc. are used. However, it is preferably a fiber having high specific strength and specific rigidity, and carbon fiber, glass fiber, aramid fiber and the like are preferably exemplified. Among these, it is more preferable to use carbon fiber.
There is no restriction | limiting in particular as a form of the said reinforced fiber, Although a continuous fiber and / or a discontinuous fiber can be used, in this invention, the discontinuous fiber of average fiber length 5mm-100mm is at least 30 of the whole reinforced fiber. When it is volume%, the effect of the present invention, particularly the effect of reducing the generation of fluff is great, and it is also effective in preventing the fibers from falling off. The reinforcing fiber having such a fiber length is preferably 50% or more, more preferably 80% or more.
The reinforcing fiber may be subjected to a surface treatment such as a treatment with a coupling agent, a treatment with a sizing agent, or an adhesion treatment of an additive. In addition, such reinforcing fibers may be used alone or in combination of two or more.

[Thermoplastic resin]
The thermoplastic resin in the present invention is not particularly limited. For example, polyolefin such as polypropylene, polyamide such as nylon, polycarbonate, polyethylene terephthalate, polyethylene naphthalate or polyester such as polybutylene terephthalate, polylactic acid, polyacetal, polyphenylene sulfide, Poly (styrene-acrylonitrile-butadiene) copolymer (ABS resin), poly (acrylonitrile-styrene) copolymer (AS resin) or styrene resin such as high impact polystyrene (HIPS), acrylic such as polymethyl methacrylate Preferable examples are based resins. The form of the thermoplastic resin is not particularly limited. For example, a film, a nonwoven fabric, a powder, or a fibrous material can be used. However, in order to stably produce a fiber-reinforced composite material described later, a film or a powder should be used. Is preferred.

[Fiber-reinforced composite materials]
In the present invention, a molded body made of a fiber-reinforced composite material containing the reinforcing fiber having the specific length and the thermoplastic resin is processed.
Here, the amount ratio of the thermoplastic resin and the reinforcing fiber is not particularly limited, but the balance between productivity and mechanical strength is that the thermoplastic resin is 50 to 1000 volume parts with respect to 100 volume parts of the reinforcing fibers. This is preferable. The amount is more preferably 100 to 1000 parts by volume, and further preferably 150 to 500 parts by volume of the thermoplastic resin.
In the fiber reinforced composite material, within the range not impairing the object of the present invention (for example, 20 Vol% or less, preferably 10 Vol% or less of the total amount of the amount of reinforcing fiber and the amount of the thermoplastic resin, Preferably, it may contain a weather resistance stabilizer, a release agent, a resin colorant, or a mixture thereof, if necessary.

[Molded body]
The fiber-reinforced composite material used in the present invention may be composed of one sheet-like single layer, but may be a laminate of two or more layers. Here, when two or more layers are laminated, sheets having the same configuration may be used, or sheets having different configurations may be used. For example, when two layers are laminated, one layer is a sheet in which reinforcing fibers having an average fiber length of 5 mm to 100 mm are made of discontinuous fibers and do not have a specific orientation, and the other layer is The sheet is made of continuous fibers and substantially aligned in one direction.
The molded body to be processed in the present invention is preferably in the range of 0.1 mm to 4.0 mm in thickness. More preferably, it is 0.3 mm to 2.0 mm. When the thickness is less than 0.1 mm, it is substantially difficult to obtain the molded body itself. When the thickness is thicker than 4.0 mm, the extraction blade is worn quickly and there is a problem in durability.

  Although there is no restriction | limiting in particular in the manufacturing method of the said molded object, For example, it can manufacture by the method of the following [1] (impregnation) [2] (cold press). Hereinafter, what is impregnated in [1] is referred to as a prepreg, and what is molded in [2] is referred to as a cold press molded body. The processing method of the present invention can be used in the state of a prepreg, and can also be used in the state of a cold press molded body. Each process of [1] and [2] can be performed independently or can be performed continuously. Further, molding and trimming and / or punching may be performed simultaneously or individually.

[1] Impregnation step The impregnation step is a step for integrating the reinforcing fibers and the resin to give rigidity and strength as a structure. When the resin is a thermoplastic resin, the inside of the reinforcing fiber bundle or between the single yarns This is a process of impregnating (impregnating) a thermoplastic resin by applying heat and pressure to and integrating them.
Specifically, the reinforcing fibers and the thermoplastic resin are overlapped (laminated) and heated to a melting point or higher when the thermoplastic resin is crystalline, and heated to a glass transition temperature or higher when the thermoplastic resin is amorphous. As a heating method, oil, an electric heater, induction heating, steam, or the like can be used, or a combination thereof can be used. The pressurization method may be a pressurizer, for example, press with a press, press with a steel belt, press with a roller, or the like. In order to obtain a stable prepreg, it is preferable to use a press.
After completion of heating and pressurization, the temperature of the compact is cooled to a solidification temperature or lower. At this time, the pressure may or may not be applied, but in order to obtain a uniform prepreg, it is preferable to apply the pressure while cooling.
In the present invention, the prepreg does not need to be completely impregnated with a thermoplastic resin, and an impregnation rate of 50% to 100% can be used, but preferably the impregnation rate is 70% to 100%. An impregnation rate of 90% to 100% is more preferable. Here, the impregnation ratio can be obtained by setting the volume of the prepreg to 100%, obtaining the volume of air contained in the prepreg, and subtracting from the volume of the prepreg.

[2] Cold Pressing Process Since the prepreg obtained in [1] is almost flat, a process for forming a shape (molding) is required. There is a cold press as a typical forming method. The cold press is a method in which the prepreg obtained in [1] is heated to a soft state and then compressed and molded with a mold.
Specifically, the prepreg produced in [1] is heated to the softening temperature or higher. The softening temperature or higher is the melting point or higher when the thermoplastic resin used in the prepreg is crystalline, and the glass transition temperature or higher when the thermoplastic resin is an amorphous resin. As a heating method, for example, an infrared heater, a hot-air circulating heater, and induction heating can be used, but it is preferable to use an infrared heater that can make uniform heating and a rapid heating rate.
The heated prepreg is placed and placed in a mold for obtaining a desired molded body. The temperature of the mold at this time is not particularly limited as long as it is equal to or lower than the solidification temperature of the thermoplastic resin, but it is preferable to adjust the temperature in order to stabilize the molding process and to prevent the temperature of the molded body from decreasing. It is more preferable to hold in the range of 50 ° C to 180 ° C. The temperature at this time may be maintained at a constant temperature or may be raised or lowered.
Next, the mold is clamped. After completion of the mold clamping, heat exchange is performed on the prepreg disposed in the mold, and in order to sufficiently solidify, a predetermined pressure is applied and held for a certain time, for example, several seconds to several minutes. The pressure is, for example, 0.5 to 30 MPa. The prepreg is formed into a predetermined shape in a mold.
Subsequently, the mold is opened, and the cold press molded body molded from the mold can be taken out.

[Mold structure]
In the processing method of the present invention, as described above, trimming and / or punching is performed in a state where a molded body obtained by cold pressing is fixed. When fixing, it is desirable in terms of processing accuracy to place the molded body in a mold.
In order to fix the molded body, a method of fixing with a separate jig or the like not attached to the mold may be used, but the mold may have a member for fixing the molded body. preferable. A typical mold structure of the present invention is shown in FIG. 1A to 1C show punching process diagrams, and FIGS. 1D to 1F show trimming process diagrams. For example, in FIG. 1A, a molded body fixing plate (2) is provided. The specific description of FIGS. 1A to 1C and FIGS. 1D to 1F is shown in the following steps 1 to 3.

Step 1)
The molded body (5) is set in the mold. (Fig. 1 (a), (d))
Step 2)
The molded body (5) is fixed by the molded body fixing plate (2) of the upper mold and the lower mold, and the molded body (5) is fixed and extracted by the cutting blade block (3) and the molded body fixing plate (2). Scratch the trimming / punching position. (Fig. 1 (b), (e))
Step 3)
When the upper die is further lowered and the spring (1) attached to the molded body fixing plate (2) located under the extraction blade block (3) is pushed by the extraction blade block (3), the molded body The fixed plate (2) and the extraction blade block (3) are integrally lowered and trimming / punching is performed by a shearing force. (Fig. 1 (c), (f))

  With respect to the range of fixing of the molded body, when a portion where trimming and / or punching is desired to be performed when the mold is closed and a cutting blade to be trimmed and / or punched is in contact with the molded body as a reference (0 mm), The molded body is fixed by applying pressure while keeping a range within 300 mm from the reference. The fixing range can be fixed by pressing an arbitrary range within 300 mm. By fixing such a range in a planar shape, it can be processed with high accuracy. Preferably it is the range within 150 mm. Moreover, there is no restriction | limiting in particular as a lower limit of this fixed range, However, The clearance of a metal mold | die and a cutting blade becomes a lower limit substantially.

  The shape of the mold used here is not particularly limited. The material used for the mold is not particularly limited as long as it is a general steel material, but a steel material such as carbon steel, alloy steel, cemented carbide steel, etc. can be preferably used. The shape of the mold only needs to match the shape of the target molded body, and a complex shape or a flat plate shape can be used. The mold may be a mechanism capable of performing only trimming and / or punching without performing the above-described cold press molding, and may be a mechanism capable of performing both cold press molding and trimming and / or punching. Since the amount used can be reduced and the weight can be reduced, it is preferable that the trimming and / or punching can be performed.

  There are no particular restrictions on the method of fixing the periphery of the area where trimming and / or punching is desired, and pressing by the shape of the mold, pressing by the clearance of the mold, pressing by the spring, deformation of the surrounding fixing part such as urethane, etc. It is possible to use methods such as embedding materials that can be fixed and fixing using a medium such as air pressure, but in order to maintain the durability of the mold and process the molded body without scratching it It is preferable to hold it with a spring.

  The clearance between the extraction blade and the mold used in the present invention is substantially the lower limit of the fixed range, and the range is preferably 0.01 mm to 0.3 mm, and preferably 0.03 mm to 0.15 mm. More preferred. If the clearance is smaller than 0.01 mm, there is a risk that the mold and the cutting blade rub against each other or the cutting blade may damage the mold. If the clearance is larger than 0.3 mm, it is difficult to firmly fix the molded body with a mold, and there is a risk of causing burrs and fluff.

  The molded body to be fixed is divided into a desired processed molded body portion that is finally obtained after being processed, and other portions. At the time of processing, there are a case where only the processed molded body portion is fixed and a case where both the processed molded body portion and the other portions are fixed. When both are fixed, the fixing range may be the same or different. For example, when a part of a sheet-like molded body of 200 mm × 200 mm is punched into a circle having a diameter of 50 mm and processed, the fixed range of the processed molded body part is set to 0.03 to 50 mm, for example, and the other parts The fixing range can be set to 0.05 to 8 mm, for example.

[Extracting blade]
The shape of the extraction blade used in the present invention is not particularly limited, but a linear shape, a zigzag shape, or a wave shape as shown in FIG. 2 can be preferably used. Moreover, it is good also as a structure which gives a little angle to a linear cutting blade and hits a molded object. In particular, it is preferable to use a wavy shape because the load applied during trimming and / or punching can be dispersed to improve the durability of the punching blade. If the material of an extraction blade is a metal, there will be no restriction | limiting in particular, A general steel material can be used preferably. Specifically, steel materials such as carbon steel, alloy steel, and cemented carbide can be used, but heat treatment and / or nitriding treatment and / or plating treatment are performed to improve the durability of the mold. Is preferred.

  Moreover, in this invention, the temperature of the extraction blade for processing is heated and heat-retained at 50 to 200 degreeC. By using a punching blade that is heated and kept constant in a specific temperature range, the resistance of the resin during the punching process can be reduced, so that the processing stability is increased. More preferably, it is preferable to heat and keep at 80 ° C to 160 ° C. There are no particular restrictions on the heating and heat retaining method of the extraction blade, but methods such as electric heater, water, steam, oil, induction heating, etc. can be used. Among these, it is particularly preferable to use water, steam, or oil that can be kept warm for a long time at a constant temperature. By keeping the extraction blade warm, it is possible to reduce the occurrence of burrs and fluff in the molded body. Further, when the temperature of the extracted blade is constant, the stability of the process, processing, dimensions, etc. can be improved when molding and / or processing is performed for a long time.

[Molding conditions]
A prepreg or cold press molded body is disposed between the molded body fixing plates 2) (reference numeral 2 in the drawing), and the upper mold part is lowered at a speed of 10 mm / sec to 1000 mm / sec. More preferably, the clamping speed is 30 mm / sec to 300 mm / sec. When the mold clamping speed is slower than 10 mm / sec, productivity is affected, and when it is faster than 1000 mm / sec, burrs and fluff tend to be generated. Specifically, the molded body fixing plate 2) in FIG. 1 presses and fixes the molded body. Moreover, the pressure at this time is adjusted by the molded body pressing spring 1) and is 0.3 to 100 MPa with respect to the area of the molded body pressing portion. More preferably, it is 1-30 MPa. When the pressure is less than 0.3 MPa, the molded body is not sufficiently fixed, and the molded body moves during trimming and / or punching to generate burrs and fluff. When the pressure is higher than 100 MPa, the molded body is damaged by the applied pressure. There is a possibility that.

Subsequently, the punching blade block 3) is lowered and lowered together with the molded body fixing plate 2) below the punching blade block 3) in a state where pressure is applied to the molded body 5). Or perform punching. Thereafter, the upper mold part is returned to the position before processing, and the fiber-reinforced composite material is taken out. The above series of operations can be performed by using a compression device. Specifically, a press machine, an injection molding machine, etc. are mentioned. Such trimming and / or punching may be performed simultaneously with the above cold press molding, or may be performed separately from the molding.
By using the processing method of the present invention, it is possible to easily obtain a molded body made of a fiber-reinforced composite material with little burrs and fluff at the end and high dimensional accuracy. As a result, it is possible to reduce costs by reducing the number of processing steps, and to obtain a fiber-reinforced composite material with good appearance and excellent mechanical properties. It can be widely applied to (interior panels, etc.), outer panels (roof, bonnet, bumper, etc.) and the like.

[Punching]
In the processing method of the present invention, punching means drilling inside the molded body, and is used for fixing holes and designs for attaching a fiber reinforced composite material product to other parts. This is done to machine holes. Specifically, it is used as a mounting hole for bolts and nuts, and as a fitting hole for meters and switches.

[trimming]
In the processing method of the present invention, trimming means a process of scraping off unnecessary portions outside the molded body, and is performed in order to align the outer shape and dimensions of the fiber-reinforced composite material with those of the product. Specifically, this is performed in order to align the outer shape and dimensions of electronic equipment casings and automotive parts panels.

Examples are shown below, but the present invention is not limited thereto.
1) Molded body 1
While opening carbon fiber (manufactured by Toho Tenax Co., Ltd .: Tenax STS40-24KS (fiber diameter 7 μm, fiber width 10 mm)) to a width of 20 mm, the fiber length is cut to 30 mm, and the supply amount of carbon fiber is 301 g / min in a tapered tube The air was blown onto the carbon fiber in the taper tube, and the fiber bundle was partially opened to spread on the table installed at the lower part of the taper tube outlet. Further, as a matrix resin, four sheets of 125 μm thick nylon 6 (manufactured by Ube Industries: melting point 220 ° C.) are used, and the dispersed carbon fibers are sandwiched between them and hot pressed at 270 ° C. and 2 MPa to obtain a thickness of 0. An 8 mm prepreg A was produced. After this prepreg A was heated to 250 ° C. with an infrared heater, it was conveyed to a clamping device and molded with a mold set at 60 ° C. to obtain a cold press molded body B.

2) Molded body 2
While opening carbon fiber (manufactured by Toho Tenax Co., Ltd .: Tenax STS40-24KS (fiber diameter 7 μm, fiber width 10 mm)) to a width of 20 mm, the fiber length is cut to 10 mm, and the supply amount of carbon fiber is 301 g / min in a tapered tube The air was blown onto the carbon fiber in the taper tube, and the fiber bundle was partially opened to spread on the table installed at the lower part of the taper tube outlet. As the matrix resin, a polycarbonate resin (polycarbonate manufactured by Teijin Chemicals Ltd .: Panlite L-1225L, glass transition temperature 145 to 150 ° C., thermal decomposition temperature 350 ° C.) tapered to an average particle size of about 710 μm is tapered at 480 g / min. The mat was mixed with carbon fiber having an average fiber length of 10 mm and polycarbonate by being supplied into the tube and sprayed simultaneously with the carbon fiber. Four matts were laminated and hot-pressed at 300 ° C. and 2 MPa to prepare a prepreg C having a thickness of 1.6 mm. After heating this prepreg C to 300 ° C. with an infrared heater, it was conveyed to a mold clamping device and shaped with a mold set at 100 ° C. to obtain a cold press molded product D.

3) Evaluation method of burrs and fluff The molded body trimmed and / or punched into the shapes shown in FIGS. 3 to 5 was observed with a visual and magnifier (magnification 30 times), and the reinforcing fibers jumped out (fluff). ◎ (good) means that there is no tearing (burr) of the integrated fiber and resin, and a small amount (less than half of the trimmed and / or punched distance) is observed as ○ (pass), and a large amount ( What was observed was more than half of the trimmed and / or punched distance). Table 1 shows the evaluation results of burrs and fluff of the molded products obtained in the examples.

4) Dimension Measurement Method In FIG. 3, the distance (14) across the center of the punched portion, in FIG. 4 the distance across the punched portion (14), and in FIG. 5, the circle diameter (14 ) Was measured with a caliper, and the deviation between the mold dimensions (FIGS. 3, 4 and 5 is all 50 mm) and the molded body dimensions was within 1/10 mm, and ◎ (good), 1/10 mm Those that were less than 3/10 mm were evaluated as “good” (accepted), and those that could not be measured and those that were 3/10 mm or larger were evaluated as “x” (defective). Table 1 shows the evaluation results of the dimension measurements of the molded bodies obtained in the examples.

5) Evaluation of corner portion The radius of curvature of the corner portion of the molded body punched into the shape of FIG. 3 was measured with an R ruler, and the curvature radius of all four corners coincided with the curvature radius (5 mm) of the mold. (Good), the case where three or more corners coincided with less than four corners was judged as ◯ (pass), and the case where two corners or less were designated as x (defect). Of the shapes punched out in the shape of FIG. 4, the angle of the corner portion of the quadrangular portion is observed and measured with a microscope, and 90 ° ± 1 ° is defined as 良好 (good), and within 90 ° ± 5 ° Was set to ○ (pass), and other than that was set to x (defect). Table 1 shows the evaluation results of the corners of the molded bodies obtained in the examples.

[Example 1]
Prepreg A was set in a punching die and punched with a punching blade (waved blade) heated to 160 ° C. to obtain a punching sample shown in FIG. The mold clamping speed at this time was 100 mm / sec, the clearance between the punching blade and the mold was set to 0.03 mm, and the range within 10 mm was fixed for both the processed molded body part and the other parts. The pressure at this time was 25 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff at the end face of the punched part was ◎. Moreover, the dimensional accuracy and the corner radius of curvature of the punched portion were ◎.

[Example 2]
The prepreg C was set in a punching die and punched with a punching blade (waved blade) heated to 100 ° C. to obtain a punching sample shown in FIG. The mold clamping speed at this time was 150 mm / sec, the clearance between the punching blade and the mold was set to 0.03 mm, and the range within 10 mm was fixed in both the processed molded body part and the other parts. The pressure at this time was 25 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff at the end face of the punched part was ◎. Moreover, the dimensional accuracy and the corner radius of curvature of the punched portion were ◎.

[Example 3]
The formed cold press compact B was set in a set punching die and punched with a punching blade (waved blade) heated to 160 ° C. to obtain a punched sample having the shape shown in FIG. The clamping speed at this time is 100 mm / sec, the clearance between the punching blade and the mold is set to 0.03 mm, the range within 10 mm of the processed molded part is fixed, and the other part is within 4 mm Fixed the range. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff at the end face of the punched part was ◎. Moreover, the evaluation of the dimensional accuracy of the punched portion was ◎, and the evaluation of the right angle at the corner was ○.

[Example 4]
The formed cold press molded body D was set in a set punching die and punched with a punching blade (waved blade) heated to 100 ° C. to obtain a punched sample having the shape shown in FIG. The clamping speed at this time is 100 mm / sec, the clearance between the punching blade and the mold is set to 0.03 mm, the range within 10 mm of the processed molded part is fixed, and the other part is within 4 mm Fixed the range. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff at the end face of the punched part was ◎. Moreover, the evaluation of the dimensional accuracy of the punched portion was ◎, and the evaluation of the right angle at the corner was ○.

[Example 5]
The formed cold press molded body B was set in a set punching die and punched with a non-heat-retained (room temperature) punching blade (wavy blade) to obtain a punching sample having the shape shown in FIG. . The clamping speed at this time is 100 mm / sec, the clearance between the punching blade and the mold is set to 0.03 mm, the range within 10 mm of the processed molded part is fixed, and the other part is within 4 mm Fixed the range. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. Large burrs and fluff were not generated on the end face of the punched part, but the evaluation was “good” because the generation of burrs was confirmed in a part having a right angle such as a square shape. Moreover, the evaluation of the dimensional accuracy of the punched portion was “good”, and the evaluation of the right angle at the corner was “good”.

[Example 6]
The formed cold press molded body B is set in a set punching die, punched and trimmed with a punching blade (waved blade) kept at 160 ° C., and a punched and trimmed sample having the shape shown in FIG. 5 is obtained. Obtained. The mold clamping speed at this time was 100 mm / sec, the clearance between the punching blade and the mold was set to 0.03 mm, and the range within 8 mm of the processed molded body portion was fixed. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff on the end face of the punched part was ◎. Moreover, the evaluation of the dimensional accuracy of the punched portion was ◎.

[Example 7]
The formed cold press molded body D is set in a set punching die, punched and trimmed with a punched blade (waved blade) kept at 100 ° C., and a punched and trimmed sample having the shape shown in FIG. 5 is obtained. Obtained. The mold clamping speed at this time was 100 mm / sec, the clearance between the punching blade and the mold was set to 0.03 mm, and the range within 8 mm of the processed molded body portion was fixed. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. The evaluation of burr and fluff on the end face of the punched part was ◎. Moreover, the evaluation of the dimensional accuracy of the punched portion was ◎.

[Comparative Example 1]
Prepreg A was set in a punching die and punched with a punching blade (waved blade) heated to 160 ° C. to obtain a punching sample shown in FIG. The mold clamping speed at this time was 100 mm / sec, and the prepreg A was not fixed. Moreover, evaluation of the dimensional accuracy of the punched portion showed a lot of burrs, and the dimensional accuracy and corner radius of curvature of the punched portion were also evaluated as x due to the influence of burrs and fluff.

[Comparative Example 2]
The prepreg A was set in a punching die and punched with a punching blade (waved blade) at a room temperature of about 20 ° C. to obtain a punching sample shown in FIG. The mold clamping speed at this time was 100 mm / sec, the clearance between the punching blade and the mold was set to 0.03 mm, and the range within 8 mm of the processed molded body portion was fixed. The pressure at this time was 10 MPa with respect to the area of the fixed part of a molded object. The evaluation of the burrs and fluffs on the end face of the punched part was Δ because some burrs were generated. There was also a loss of fibers. Moreover, the dimensional accuracy and the corner radius of curvature of the punched part were also x due to the influence of burrs and fluff.

1. 1. Compact body holding spring 2. Molded body fixing plate 3. Extraction blade block 4. Molded body pressing range Molded body 6. 6. Clearance between extraction blade and mold 7. Tip position of extraction blade 8. Straight blade Zigzag blade 10. 10. Wavy blade Prepreg 12. 12. Dimensional distance measurement position Punching / trimming line14. Corner radius of curvature 15. Cold press compact

Claims (6)

  A molded body that is trimmed and / or punched using a cutting blade heated and kept at 50 ° C. to 200 ° C. while fixing a molded body composed of a reinforced fiber having an average fiber length of 5 to 100 mm and a thermoplastic resin. The portion for fixing the molded body is within a range of 300 mm or less based on the portion where the cutting blade contacts the molded body, and 0.3 MPa per unit area of the molded body. The processing method of a molded object characterized by fixing with the pressure of -100 Mpa.   The processing method according to claim 1, wherein the portion for fixing the formed body is within a range of 150 mm or less with respect to a portion where the extraction blade contacts the formed body.   The processing method according to claim 1, wherein fixing is performed at a pressure of 1 MPa to 30 MPa per unit area of the molded body.   The processing method according to claim 1, wherein the reinforcing fiber is carbon fiber, glass fiber, or aramid fiber.   The processing method according to any one of claims 1 to 4, wherein an abundance ratio of the fiber and the resin of the fiber-reinforced composite material is 50 to 1000 parts by volume of the thermoplastic resin with respect to 100 parts by volume of the reinforcing fiber.   The molded body is placed in a mold and trimmed and / or punched, and the clearance between the cutting blade and the mold is 0.01 mm to 0.3 mm. The processing method in any one.