JP3231876B2 - Glass roving cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass roving cutter for cutting a glass roving, and more particularly to a glass roving cutter suitably used for an apparatus for producing a sheet-like molding material by mixing the cut glass roving with a resin component or the like. It is.

[0002]

2. Description of the Related Art In recent years, in order to improve the working environment, the conventional hand lay-up and spray-up molding methods have been changed to press molding methods using thin SMC (sheet molding compound) and thick TMC (thick molding compound). And it is transitioning rapidly. These SMC, T
Provided by the present applicant is an apparatus for producing a kneaded material by mixing glass fiber with a liquid material such as a resin to produce MC, and covering the kneaded material with a resin film to produce a sheet-like FRP molding material. are doing. (Special Publication No. 52-1790
3)

[0003] The apparatus for producing the sheet-like molding material is as follows.
As shown in FIG. 7, glass roving A is continuously supplied between the cutter roll 1 having the cutter blade 3 and the rubber roll 2, and the cutter roll 1 and the rubber roll 2 are rotated. The cutter roving A is cut into chops of about 1 ″ to obtain a glass fiber A ′. This cut glass fiber A '
Is supplied to the lower impregnating rollers 4 and 4 ′ to impregnate the liquid material B composed of a resin component and the like, and the impregnated kneaded material is scraped off by the scraping rollers 6 and 6 ′ and transferred to the transport conveyor 7. The sheet is supplied, and the upper and lower surfaces are covered with resin sheets C and C ′ to form a sheet-shaped product.

[0004] In the glass roving cutter used in the apparatus for manufacturing the sheet-like molding material, as shown in FIG. 8, when cutting the glass roving A, the cut glass fiber A 'is cut by the adjacent blades 3a and 3b. , 3b and 3
c,... are easily trapped, and the glass fiber A ′ is trapped in an arcuate shape as shown in the figure. As described above, when a large number of glass fibers A 'drop at once, there is a problem that the content and impregnation of glass in the kneaded material (finally, product) become uneven.

In order to solve the above problem, the present applicant has previously provided a glass roving cutter disclosed in Japanese Patent Laid-Open No. 1-171943. The above glass roving cutter,
As shown in FIG. 9, a movable spacer 9 is arranged at an intermediate position between adjacent cutter blades 3a ', 3b',.
Rotate, these movable spacers 9 slide up and down as shown in FIGS. 10 (A) and 10 (B) by centrifugal force or pressing force from the rubber roll 2 which comes into contact with the rubber roll 2 disposed oppositely. , Between the adjacent cutter blades 3a ', 3b',... Is prevented from accumulating.

[0006]

However, in the above-mentioned glass roving cutter, since the movable spacer 9 is slidably mounted in the spacer mounting groove 10, the movable spacer 9 is necessarily provided between the movable spacer 9 and the spacer mounting groove 10. Gaps occur. Cutting powder or glass fiber A 'is likely to be clogged in this gap, and the movable spacer 9 may not slide. When the movable spacer 9 cannot move as described above,
Glass fibers A 'accumulate between the adjacent cutter blades 3a', 3b ', .... Therefore, the glass roving cutter has to be disassembled and maintained, which is extremely difficult and delays the production of the sheet molding material.

Further, since the wall surfaces of the spacer 9 and the spacer mounting groove 10 are formed of metal, the sliding of the spacer 9 generates metal powder, and the metal powder is mixed with the glass fiber A 'in the liquid material. There is a disadvantage that the product is impregnated with B and causes black stains on the product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a spacer is provided between adjacent cutter blades so as to protrude from the surface of a cutter roll, so that cut glass fibers accumulate between adjacent cutter blades. And to enable continuous cutting of the glass roving.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cutter roll in which a plurality of cutter blades are arranged on an outer circumferential surface of a cutter roll at a predetermined interval in the circumferential direction and are adjacent to each other in the circumferential direction. A spacer protruding from the surface of the cutter roll is provided between the cutter blades, and the spacer is fixed to the cutter roll, and the length of the spacer protruding from the surface of the cutter roll is determined by the length of the cutter blade. The present invention provides a glass roving cutter characterized in that the length is set shorter than the length of protrusion from the cutter roll surface.

On the outer circumferential surface of the cutter roll, spacer mounting grooves are provided at intervals in the circumferential direction and extended in the axial direction so as to be recessed, and the spacers are closely fitted and fixed in the spacer mounting grooves. . Alternatively, the spacer is provided on the outer peripheral surface of the cutter roll by integrally forming protrusions that are spaced apart in the circumferential direction and extend in the axial direction.

The spacer preferably has a rectangular, semi-annular or mountain-shaped cross section at a portion protruding from the outer peripheral surface of the cutter roll.

Generally, a plurality of cutter blades projecting from the surface of the cutter roll are provided at intervals of 1 inch (25.4 mm). In that case, the width of the spacer is 4-6.
mm, and the projecting length of the spacer from the surface of the cutter roll is 0.01 mm or shorter than the tip of the cutter blade protruding outside from the cutter roll, and the spacer is projected from the center position of the adjacent cutter blade. Good to be. The projecting length of the spacer from the cutter roll is more preferably about 程度 of the projecting length of the cutter blade projecting from the surface of the cutter roll.

[0013]

According to the glass roving cutter of the present invention, a spacer for preventing clogging of the cut glass roving is formed integrally with or separately from the cutter roll, and the spacer is formed from the protrusion length of the cutter blade protruding from the surface of the cutter roll. Projected with a short length. Therefore, the glass roving can be reliably cut, and the cut glass roving can be reliably prevented from contacting the spacer projecting in a fixed state and accumulating between the adjacent cutter blades.

Further, since the spacer is projected to the cutter roll in a fixed state, the spacer and the cutter roll are not rubbed to generate metal powder or the like. There is no dirt on the surface. The glass roving cutter according to the present invention can be applied to cutting other roving fibers, for example, carbon fibers.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. The glass roving cutter 15 includes an annular cutter roll 16 and a rubber roll 32 shown in FIG.
(Shown in FIG. 4).

The cutter roll 16 of the first embodiment is shown in FIG.
As shown in (1), cutter blades 17 are provided on the outer peripheral surface at equal pitches in the circumferential direction, and a spacer 18 is projected at an intermediate position between these adjacent cutter blades 17.

More specifically, as shown in FIG. 2, long cutter blade mounting grooves 20 are formed on the outer peripheral surface of the cutter roll 16 at equal pitches in the circumferential direction, extending to near both ends in the axial direction. The cutter blade 17 is fixed to the cutter blade mounting groove 20 via a cutter blade embedding plate 21 so that the blade edge side protrudes from the outer peripheral surface of the cutter roll 16. Further, at the center position between the adjacent cutter blade mounting grooves 20, spacer mounting grooves 23 are bored over the entire length of the cutter roll 16 in the axial direction, and the spacers 18 are radially inserted into these spacer mounting grooves 23. Attached.

The spacer 18 has a rectangular cross section projecting from the surface of the cutter roll 16.
As shown in FIG. 3, a step 18a is formed by cutting off both ends in the axial direction by one step. Meanwhile, cutter roll 1
A holding plate 25 integrally formed with an annular holding portion 25a bent to the outer peripheral end portion is fixed to both end surfaces of the roll portion 6 with screws (not shown). At this time, the spacer 18
Is tightly fitted in the spacer mounting groove 23 of the cutter roll 16, and the stepped portion 18 a of the spacer 18 is clamped and fixed between the holding portion 25 a and the bottom surface of the spacer mounting groove 23. Depth and spacer 1
8, the thickness of the step 18a is set.

In the above-mentioned fixed state, the upper end of the spacer 18 protrudes from the surface of the cutter roll 16 by about 1/3 of the length of the cutter blade 17 protruding outside. However, the projecting length of the spacer 18 is not limited to this, and may be any length as long as it is longer than 0.01 mm and shorter than the projecting length from the surface of the cutter roll 16 to the cutting edge of the cutter blade 17. And the width of the spacer 18 is 4-6.
mm. Therefore, when the glass fiber A ′ obtained by cutting the glass roving A is about to be clogged between the glass blades 17, the glass fiber A ′ is interposed between the glass blades 17 because the spacer 18 prevents the glass fiber A ′ from entering. There is no accumulation. Also, the spacer 18
Is fixed to the spacer mounting groove 23 of the cutter roll 16 in a closely fitted state, so that there is no clogging of cutting powder or the like between the spacer 18 and the spacer mounting groove 23.

Glass roving cutter 15 having the above structure
Is suitably used for the impregnating device of the sheet-shaped molding material manufacturing device shown in FIG. 4, and the operation steps of the impregnating device will be described next. It should be noted that the same devices as those of the conventional device shown in FIG.

In the above-mentioned apparatus, the cutter roll 16 is rotatably mounted on the upper end of the frame 30, and the cutter roll 16 is rotated by the motor 31 so that the opposing rubber roller 3 is rotated.
The glass roving A descending between 2 is continuously cut to a predetermined length. In this embodiment, the cutter roll 16 has a diameter of 261 mm and is rotated at 150 rpm. The cutter blade 16 is attached to the cutter roll 16 at an interval of 1 inch (25.4 mm). And the glass roving A to be cut is Tex
(g / km) 4630 is used.

The cut glass fiber A 'is dropped onto the impregnating rollers 4, 4' arranged below, and the impregnating rollers 4, 4 'are rotated inward by a motor 33 or the like. Liquid material supply pipes 5 are disposed on the upper surfaces of the liquid substances 4 and 4 '.
Is spread on the surfaces of the impregnating rollers 4, 4 '. Therefore, the glass fiber is impregnated with the liquid material B when passing through the gap between the impregnating rollers 4, 4 ', and the impregnated kneaded material moves downward along the surfaces of the rollers 4, 4'.

Below the impregnating rollers 4, 4 ', scraping rollers 6, 6' are arranged, respectively, and these rollers 6, 6 'are driven by motors 34, 35 on the upper impregnating rollers 4, 4'.
It rotates at high speed in the same direction as 4 '. The kneaded material moving along the surface of the impregnating rollers 4, 4 'is scraped off by the scraping rollers 6, 6' and dropped on the lower film C to be supplied downward.

The lower film C is supplied from a lower film unwinder 36 directly below the scraping rollers 6, 6 'via a guide roller 37, while an upper film unwinder 38 supplies a guide roller 39. To supply the upper film C ′ so as to cover the upper surface of the kneaded material on the lower film C,
Manufactures sheet-like molding materials coated on films C and C ′.

FIG. 5 shows a spacer 18 'of the second embodiment. In the second embodiment, cutter blade mounting grooves are provided at a predetermined pitch on the cutter roll 16', and the cutter blades are inserted into these cutter mounting grooves by the first blade. It is attached in the same manner as in the embodiment. A spacer 18 'is integrally protruded in the axial direction at a central position between the cutter blade mounting grooves, and the spacer 18' has a rectangular cross section at a portion protruding from the cutter roll 16 '. . The configuration is the same as that of the first embodiment except that the pressing portion 25 for the spacer is not required, and the same effects as those of the first embodiment can be obtained. Therefore, detailed description is omitted.

The spacers 18 and 18 'of the first and second embodiments have a half sectional shape of a portion projecting from the surface of the cutter rolls 16 and 16' as shown in FIG. It may be a ring shape. In addition, as shown in FIG. 6B, a mountain shape that becomes thinner toward the upper end may be used.

[0027]

As is apparent from the above description, in the glass roving cutter of the present invention, the spacer for preventing the accumulation of the cut glass roving is provided integrally with or separately from the cutter roll, and the surface of the cutter roll is provided. The protruding length is shorter than the protruding length of the protruding cutter blade. Therefore, the cutter blade can surely contact the glass roving and cut. Further, since the spacer is fixed and protrudes from the cutter roll, no inconvenience such as clogging of the glass fiber between the spacer and the spacer mounting groove for mounting the spacer does not occur.

Further, since the spacer prevents the cut glass roving from entering, the cut glass roving does not accumulate between the adjacent glass blades. Therefore, it is possible to prevent the glass rovings from being accumulated between the cutter blades and to be hardened and dropped at one time, and it is possible to eliminate unevenness in the glass content and impregnation in the sheet molding material to be manufactured. In addition, since the spacer is fixedly attached to the cutter roll, no metal powder is generated, so that the product of the sheet-shaped molding material is not stained by the metal powder.

[Brief description of the drawings]

FIG. 1 is a plan view showing a glass roving cutter of the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of FIG.

FIG. 3 is a sectional view showing a fixed state of the spacer shown in FIG. 2;

FIG. 4 is a front view showing a sheet-shaped molding material manufacturing apparatus provided with a glass roving cutter.

FIG. 5 is a sectional view showing a spacer according to a second embodiment.

FIGS. 6A and 6B are partially enlarged views showing a modification of the shape of the spacer.

FIG. 7 is a schematic view showing a conventional sheet-shaped molding material manufacturing apparatus.

FIG. 8 is a schematic view showing a problem of a conventional glass roving cutter.

FIG. 9 is a partially enlarged view showing another conventional example of a glass roving cutter.

FIGS. 10A and 10B are partial cross-sectional views showing an operation state of the glass roving cutter shown in FIG. 8;

[Explanation of symbols]

 15 Glass Roving Cutter 16 Cutter Roll 17 Cutter Blade 18 Spacer 18a Step 23 Spacer Mounting Groove 25 Holding Plate 32 Rubber Roll A Glass Roving A 'Cut Glass Roving

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI // B29K 105: 08 B29K 105: 08 (58) Investigated field (Int.Cl. ⁷ , DB name) B29B 9/00-9 / 16 B02C 18/00-18/44 B26D 1/00-1/62 C03B 37/00-37/16 D01G 1/00-1/10

Claims (1)

(57) [Claims] A cutter blade is provided on an outer peripheral surface of a cutter roll at a predetermined interval in a circumferential direction and is juxtaposed in an axial direction, and a spacer protruding from a surface of the cutter roll is provided between these circumferentially adjacent cutter blades. The spacer is fixed to the cutter roll, and the length of the spacer protruding from the surface of the cutter roll is set shorter than the length of the cutter blade protruding from the surface of the cutter roll. A glass roving cutter characterized by the following.