WO2007061004A1

WO2007061004A1 - Cutter of glass fiber strand

Info

Publication number: WO2007061004A1
Application number: PCT/JP2006/323348
Authority: WO
Inventors: Hideyuki Nakamura; Atsushi Furuta
Original assignee: Ocv Intellectual Capital, Llc
Priority date: 2005-11-22
Filing date: 2006-11-22
Publication date: 2007-05-31
Also published as: JP2007137750A; JP4965850B2

Abstract

A cutter of glass fiber strand for enhancing productivity of chopped strand by reducing abrasion of a cutter roll by a cutting edge at the bottom of a slit thereby prolonging the lifetime of the cutter roll. The cutter of glass fiber strand comprises a rotary receiving roll, and a cutter roll having a large number of cutting edges arranged in the axial direction while spaced apart radially with their lower ends being inserted into the slit at a cutting edge receiving portion, and cuts a glass fiber strand fed between both rolls by means of the cutting edges. The cutting edge receiving portion of the cutter roll is formed of a fixed cutting edge receiving portion substantially integrated with the shaft portion, and a tubular cutting edge receiving portion secured removably to the fixed cutting edge receiving portion. Rings made of a material harder than that at the cutting edge receiving portion of the cutter roll are provided at the opposite ends of the cutting edge receiving portion and between the fixed cutting edge receiving portion and the tubular cutting edge receiving portion, and cutting load of the cutting edge is substantially supported on the rings by making the lower end of the cutting edge contact and engage with the rings.

Description

Specification

Glass fiber strand cutting equipment

Technical field

The present invention relates to a glass fiber strand cutting device, and more particularly to a cutting device for producing chopped strands from glass fiber strands.

Background art

Conventionally, when producing chopped strands by cutting glass fiber strands, a cutter roll having a large number of cutting blades radially provided on the outer periphery of a rotating body and urethane rubber or the like attached to the outer periphery. A cutting device is used in which the glass fiber strand is sandwiched between both rolls and rotated by the cutting blade while being pressed against the rolls. An example of such a cutting device is disclosed in Patent Documents 1 to 3.

That is, as shown in FIG. 9, the cutter roll 1 includes a main body portion 8 to which the cutting blade 4 is attached, reduced diameter boss portions 14 formed on both sides thereof, and bearing portions 15 on both sides thereof. And a shaft portion 16 for fixing a pulley for transmitting rotational force. A large number of slit grooves 10 are formed in the outer periphery of the main body 8 at predetermined intervals in the radial direction, as shown in FIG. The lower end is inserted. Thereby, the cutter roll 1 in which the cutting edges 4 are erected radially at a predetermined interval on the outer periphery of the main body portion 8 is obtained.

FIG. 11 shows an enlarged cross-sectional view of the attachment portion of the cutting blade 4 attached to the cutter roll 1 in this way, and all the cutting blades are attached in the same manner. The cutting edge 4 has substantially the same length as the main body, and its thickness is as thin as about 0.4 to 1 mm, for example. When the thickness of the cutting edge is so thin, a slit groove 10 having a width wider than the thickness of the cutting edge is formed as shown in Fig. 11, and a spacer 9 is inserted between the groove and the cutting edge. The cutting blade is fixed so that it does not wobble in the groove.

[0005] The cutting blade 4 inserted in the slit groove 10 is fixed by locking the blade presser 11 fitted to the boss portions 14 on both sides of the main body 8 to the main body 8 as shown in FIG. Is called. That is, although not shown, for example, an annular protrusion is provided on the inner periphery of the blade holder 11. Then, with the recesses formed at both ends of the cutting blade and the spacer being engaged with the protruding portion, the cutting blade 4 is fixed to the body portion 8 by, for example, bolts 22 to fix the cutting blade 4 to the body. Fixed to part 8 in its longitudinal and radial directions. The distance between the cutting edge 4 of the cutter roll 1 and the receiving roll 2 is set such that the tip of the cutting edge 4 slightly presses the surface of the receiving roll 2 as shown in FIG.

Furthermore, between the cutting blades of the cutter roll, a wire rod 27 is stretched so as to be able to move inertially in the radial direction of the cutter roll 1 as shown in FIGS. 9 and 10. By this movement of the wire rod, the chopped strands 13 between the cutting blades are ejected outward and eliminated.

[0007] In such a cutter roll, the hardness of the cutting edge is, for example, 800H,

V

The surface hardness of the blade holder is about 400 to 500H, and the slit groove into which the cutting blade is inserted

V

The part has a hardness of, for example, about 200H due to workability. Meanwhile, glass fiber strand

V

When the blade 29 is cut, the cutting blade 4 is pressed toward the center of the cutter roll 1 by the receiving roll 2, so that a cutting load is applied to the cutting blade attached to the slit groove of the main body. This cutting load is substantially supported by the bottom of the slit groove with which the lower end of the cutting blade is in contact engagement. At that time, a constant amount of cutting load is not continuously applied to the bottom of the slit groove, but the load is applied only at the time of cutting. Therefore, the load is applied at each cutting, that is, at each rotation of the cutter roll. The load of is repeated.

[0008] Therefore, the bottom of the slit groove having a hardness lower than that of the cutting edge is worn by the lower end of the hard cutting edge, and the wear amount of the groove bottom increases with the operating time of the cutting device. The shaded portion 24 in FIG. 11 is this worn portion. When the wear amount at the bottom of the groove increases, the cutting blade is inserted deeply into the slit groove by this amount of wear, so when the wire is stretched between the cutting blade and the cutting blade as described above In this case, the distance between the tip of the cutting blade and the wire is increased accordingly. When the wire moves away from the cutting blade in this way, the movable range of the wire expands, so that the wire contacts the cutting blade and damages the cutting blade, and the pressing force of the wire against the urethane rubber receiving roll increases. For this reason, the wire rod damages the receiving roll.

[0009] In addition, since the gap between the wire rod and the cutting edge is widened, the cut glass fiber strand (chopped strand) is likely to be clogged in the gap. By adjusting the position of the wire rod, It is possible to make the distance from the blade appropriate. Since the production of chopped strands must be interrupted and the force utter roll must be removed from the cutting device and adjusted, work efficiency is reduced.

[0010] In addition, since the cutting load of the cutting blade is not uniform in the length direction, the amount of wear of the slit groove is not uniform in the length direction. As a result, the cutting load of the cutting blade is reduced in the portion with a large amount of wear compared with the portion with a small amount of wear, so that the glass fiber strand may be uncut or unsatisfactory. When the cutting failure is caused in this way, the frequency of monofilament generation is increased because the bundle of chopped strands is broken, and the bulk of the chopped strands is increased and clogging occurs during the cutting process. Furthermore, variation in the cutting load in the length direction of the cutting edge may cause damage to the cutting edge (blade breakage or chipping) at locations where the cutting load is large.

[0011] In such a case, conventionally, the cutting operation was performed by increasing the contact pressure between the receiving roll and the cutter roll, that is, increasing the cutting load. This measure can eliminate short-time cutting defects. The contact pressure becomes excessive, so it cannot withstand long-term use. Furthermore, if the contact pressure is excessive, the amount of wear per hour of the urethane rubber receiving roll will increase, leading to poor cutting of the glass fiber strands at an early stage and an increase in the amount of wear on the cutting edge. .

[0012] Note that if the hardness of the slit groove is increased by using a hard material for the blade receiver of the cutter roll body, the wear of the groove bottom due to the cutting blade can be reduced. If the hardness is increased, the slit groove formation force becomes difficult, so the material is required to have a practical hardness that allows the slit groove to be formed economically, and the hardness cannot be increased unnecessarily. is there.

[0013] As described above, the conventional glass fiber strand cutting device has a large amount of wear per hour due to the cutting blade at the slit groove bottom of the cutter roll, and the wear is not in the longitudinal direction (axial direction) of the cutter roll. Because it is uniform and the damage to the receiving roll is large, the cutter roll and the receiving roll are replaced when the amount of wear or damage reaches a certain level to prevent defective cutting. Therefore, the cutter roll and the receiving roll are frequently replaced, and there is a problem that the work efficiency is lowered due to the interruption of the work at the time of replacement, and the productivity is remarkably lowered. [0014] Further, such frequent replacement has caused an increase in the cost of manufacturing and processing the cutter roll and the receiving roll, as well as a decrease in productivity.

[0015] Patent Document 1: Japanese Patent Publication No.57-16936

Patent Document 2: Japanese Utility Model Publication No. 60-26092

Patent Document 3: Japanese Utility Model Publication No. 6-61938

Disclosure of the invention

Problems to be solved by the invention

[0016] An object of the present invention is to provide a glass fiber strand cutting device that can reduce the amount of wear at the slit groove bottom of the cutter roll to increase the life of the cutter roll and produce chopped strands with high productivity.

Means for solving the problem

[0017] In order to achieve the above object, the glass fiber strand cutting device of the present invention comprises a rotating receiving roll and a plurality of cutting blades radially spaced around the periphery and arranged in the axial direction. The cutting blade is mounted by inserting a lower end portion into a slit groove formed on the outer periphery of the blade receiving portion of the cutter roll, and is rotated by pressing the cutter roll against the receiving roll. A glass fiber strand cutting device for cutting the glass fiber strand sent between the cutting blade and the blade receiving portion of the cutter roll, wherein the blade receiving portion of the cutter roll is substantially integrated with the shaft portion; A cylindrical blade receiving portion fixed to the shaft portion on both sides or one side of the fixed blade receiving portion in a detachable manner, and a cutter roll between both ends of the blade receiving portion and between the fixed blade receiving portion and the cylindrical blade receiving portion. Blade holder Is provided with a harder material of the-ring, characterized in that the lower end of the cutting edge is engaged in contact engagement on the ring to substantially support the cutting load weight of the cutting blade in the ring.

[0018] In the glass fiber strand cutting device of the present invention, the length of the cutting blade held by the cutter roll blade receiving portion and the ring is held by the ring of (a) and (a). When the total width of the portion is (b), the ratio of (b) to (a) is preferably 5 to 50%.

[0019] Further, it is preferable that the hardness of the ring is equal to or softer than the hardness of the cutting blade. The cutting blade is parallel to the outer periphery of the blade receiving portion of the cutter roll and the rotation axis of the cutter roll. It is preferable to be installed in. In a preferred embodiment of the glass fiber strand cutting device of the present invention, the cut glass fiber strand is inserted between the cutting blades radially disposed on the outer periphery of the blade receiving portion of the cutter roll. A discharging means is provided for removing from between the cutting blades. The discharge means is preferably a wire rod elastically stretched between the cutting blades in parallel with the cutting blade, or a thin plate laid between the cutting blades in parallel with the cutting blade.

The invention's effect

[0021] As described above, the glass fiber strand cutting device of the present invention includes a fixed blade receiving portion in which the blade receiving portion of the cutter roll is substantially integrated with the shaft portion, and both sides of the fixed blade receiving portion. Or a blade receiving portion of a cutter roll between both ends of the blade receiving portion and the fixed blade receiving portion and the cylindrical blade receiving portion. Since a ring made of a harder material is provided and the lower end of the cutting blade attached to the slit groove of the blade receiving portion is engaged with the ring, the cutting load of the cutting blade is substantially supported by the ring. The wear due to the cutting edge of the slit groove of the blade receiving portion can be reduced. As a result, the life of the cutter roll can be extended and the replacement frequency of the cutter roll can be reduced, so that the productivity of the chopped strand can be improved and the manufacturing cost of the cutter roll can be reduced.

[0022] Furthermore, since only the worn ring needs to be replaced, the blade receiving portion of the cutter roll can be used repeatedly until damage occurs. Furthermore, since the blade receiving part is composed of a fixed blade receiving part and a detachable cylindrical blade receiving part, a seamless lathe or ring is provided between the fixed blade receiving part and the cylindrical blade receiving part to Since it can be supported, the cutting edge of the cutting blade can be reduced, and the ring can be easily replaced. When only the cylindrical blade receiving portion is damaged, this portion can be replaced.

[0023] Further, since the wear of the blade receiving portion of the cutter roll can be reduced as described above, the variation of the cutting edge of the cutting blade with respect to the chopped strand discharging means provided between the receiving roll and the cutting blade can be reduced. This makes it possible to keep the cutting load of the cutting blade constant without having to increase the contact pressure against the receiving roll in response to the wear of the blade receiving portion as in the past, and to stabilize high-quality chopped strands. Can be manufactured. It can also prevent clogging in the discharge means. In addition, since the wear of the cutter roll blade holder is reduced, damage to the receiving roll is reduced and the service life is extended. Compared with less, it can improve productivity.

[0024] Further, according to the glass fiber strand cutting device of the present invention, the lower end portion of the cutting blade is supported by the rings arranged at a plurality of locations of the cutter roll blade receiving portion, and the length of the cutting blade at that time is supported. By supporting 5 to 50% of the direction with a ring, the cutting blade can be stably made uniform in the holding direction, and the contact pressure to the receiving roll can be made uniform, so that the glass fiber strand can be cut stably. In addition, by forming the ring with a material that is the same as or softer than the hardness of the cutting blade, wear of the ring can be suppressed while preventing damage to the cutting blade. In addition, by providing a cutting blade parallel to the rotation axis of the cutter roll, the cut surface of the resulting chopped strand is finished cleanly, which improves the handling of the chopped strand and improves the shape retention. Therefore, for example, it is possible to reduce the rate of scattering in the piping during air transportation.

Furthermore, according to the glass fiber strand cutting device of the present invention, the chopped strands cut between the cutting blades are disposed between the cutting blades radially disposed on the outer peripheral surface of the blade receiving portion of the cutter roll. By providing the discharging means for eliminating, it is possible to prevent the chopped strands from being clogged between the cutting edges. In particular, the chopped strand can be reliably removed from between the cutting blades by elastically stretching the wire rod between the adjacent cutting blades in parallel with the cutting blade as the discharging means.

FIG. 1 is a schematic cross-sectional view of a cutter roll according to a preferred embodiment of the present invention.

FIG. 2 is a front view of a shaft portion of the cutter roll of FIG.

FIG. 3 is a cross-sectional view taken along the line AA in FIG.

[FIG. 4] (a) is a side view of the cylindrical blade receiving portion of FIG. 1, and (b) is a cross-sectional view of the BB portion of (a).

[FIG. 5] (a) is a side view of the ring of FIG. 1, and (b) is a cross-sectional view of the CC section of (a).

FIG. 6 is a schematic front view of the holding plate of FIG.

FIG. 7 is an enlarged view of a part of FIG.

FIG. 8 is a partially enlarged sectional view of the cutter roll of FIG.

FIG. 9 is a partial sectional view of a conventional cutter roll.

FIG. 10 is a partially enlarged view of a cutting part of the cutting device. 11] An enlarged cross-sectional view of the cutting blade mounting portion of the cutting device _c

Explanation of symbols

[0027] 1: Cutter roll 2: Receiving roll

3: Shaft part 4: Cutting edge

5: Fixed blade receiver 6: Ring

7: Cylindrical blade receiving part 8: Body part

9: Spacer 10: Slit groove

11: Blade holder 12: Holding plate

13 14: Boss

15: Bearing 16: Shaft

17: Pulley 18: Screw hole

19: Bonole screw 20: Screw hole

20 ': Bolt hole 21, 22: Bonoret

23: Slit 24: Shadow

25: Cut 26: Bonoret

27: Wire rod 28: Annular protrusion

29: Glass fiber strand

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a preferred embodiment of a glass fiber strand cutting device of the present invention (hereinafter referred to as the present cutting device) will be described with reference to the drawings. However, the following drawings are illustrated for facilitating the understanding of the present invention, and the present invention is not limited thereto. Note that parts that are substantially the same as those of the conventional glass fiber strand cutting device shown in FIGS. 9 to 11 are denoted by the same reference numerals and description thereof may be omitted.

[0029] The present cutting apparatus includes a cutter roll and a receiving roll in which a plurality of cutting blades are radially spaced on the outer periphery, and the cutter roll and the receiving roll are respectively connected to the respective rotating shafts. Are installed in parallel, the distance between both rolls is adjusted, the cutting edge of the cutter roll is pressed against the receiving roll and rotated, and the glass fiber strand sent between these rolls (hereinafter also referred to as the strand). Chopped strand by cutting with the cutting blade. Can be manufactured. This basic configuration is substantially the same as the conventional cutting apparatus shown in FIGS.

[0030] In the present cutting device, the receiving roll is a cylindrical roll having substantially the same width as the cutting edge, and the outer peripheral surface is formed of a tough material having softness and moderate elasticity that does not damage the cutting edge. Has been. As this material, for example, urethane rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber and the like can be preferably used. Among these, urethane rubber is excellent in terms of toughness and elasticity.

Next, the cutter roll will be described with reference to the drawings. FIG. 1 is a schematic view of a cross section of a typical cutter roll 1 in the present invention, and FIG. 2 is a front view of a shaft portion 3 of the cutter roll 1. In this example, the blade receiving part of the cutter roll 1 includes a fixed blade receiving part 5 integrated with the shaft part 3 as shown in FIG. 1, and cylindrical blade receiving parts 7 provided on both sides of the fixed blade receiving part. Is formed by. Therefore, in the following description, the blade receiving portion refers to both the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7 collectively.

[0032] In the cutter roll 1 of this example, after the ring 6 is fitted to the shaft portions 3 on both sides of the fixed blade receiving portion 5, the cylindrical blade receiving portion 7 is detachably attached to the outer shaft portion 3, Further, a ring 6 is provided on the outside of the cylindrical blade receiving portion 7 so as to be fitted to the shaft portion 3, and the lower end of the fixed blade receiving portion 5 and the cutting blade 4 held by the cylindrical blade receiving portion 7 is in contact with the ring 6. The ring 6 is configured to support the cutting load applied to the cutting blade 4 by being engaged.

Next, main components of the cutter roll 1 will be described with reference to the drawings.

As shown in FIG. 2, the shaft portion 3 has the fixed blade receiving portion 5 in the center, and is provided with a portion for attaching the cylindrical blade receiving portion 7 and the ring 6 on both sides thereof, and further at the tip of the shaft portion. It has a boss part 14 and a bearing part 15 for rotatably supporting the cutter roll 1, and one of the bearing parts 15 is provided with a shaft 16 for attaching a pre-17 (see FIG. 1). Yes. The fixed blade receiving portion 5 of this example is formed integrally with the shaft portion 3 by, for example, cutting one steel material, but the sleeve-like fixed blade receiving portion is welded and shrink-fitted to the shaft portion 3. Alternatively, they may be fixed and integrated by bonding or the like. In the present invention, the fixed blade receiving portion substantially integrated with the shaft portion means that such a fixed blade receiving portion is also included.

FIG. 3 is a cross-sectional view of the shaft 3 taken along the line AA in FIG. Fixed blade holder as shown in Fig. 3. A large number of slit grooves 10 for attaching the cutting blade 4 are radially formed in the outer peripheral portion of the portion 5 in parallel with the longitudinal direction of the blade receiving portion at equal intervals. In this case, the slit groove 10 can be formed so that the cutting edge 4 can be mounted at a predetermined angle with respect to the rotation axis of the cutter roll, but normally, the force chopping roll is used to cleanly cut the cut surface of the chopped strand. It is preferable to install it in parallel with the rotation axis. The width of the slit groove 10 is appropriately determined according to the thickness of the cutting edge 4. However, when the thickness of the cutting edge 4 is thin, it becomes difficult to form the slit groove 10, so the slit groove 10 is formed with a width wider than the thickness of the cutting edge 4, and the cutting edge 4 and the slit groove 10 It is preferable to insert the spacer 9 between them (see Fig. 11).

Further, the interval between the slit grooves 10 is determined so as to be the length of the chopped strand to be cut by the interval force of the cutting edge of the cutting blade 4 attached to the slit groove 10. Therefore, when a long chopped strand is cut, the interval between the slit grooves 10 is widened. The depth of the slit groove 10 varies depending on the height of the cutting blade 4 and is not limited, but is usually about half the height of the cutting blade.

It should be noted that a screw hole 18 for fixing the ring 6 fitted to the shaft portion 3 and the cylindrical blade receiving portion 7 to the fixed blade receiving portion 5 with a bolt 21 is provided on the side portion of the fixed blade receiving portion 5. 2 and 3 are provided.

FIG. 4 shows a typical cylindrical blade receiving portion 7, (a) is a side view thereof, and (b) is a cross-sectional view of the BB portion of (a). In this example, the cylindrical blade receiving portions 7 provided on both sides of the fixed blade receiving portion 5 are the same, and each cylindrical blade receiving portion 7 has substantially the same outer diameter and shaft portion 3 as the fixed blade receiving portion 5 described above. It has an inner diameter that can be fitted with accurate accuracy. The length dimension of the cylindrical blade receiving portion 7 is determined so that a predetermined blade receiving portion can be obtained with the fixed blade receiving portion 5. The ratio of the fixed blade receiving part 5 and the cylindrical blade receiving part 7 in the blade receiving part is not specified. It is preferable to support in a balanced manner. However, when the cutting load at the center portion of the cutter roll 1 is relatively large, the length of the fixed blade receiving portion 5 is shortened so that the interval between the rings 6 arranged on both sides of the fixed blade receiving portion 5 is reduced. By narrowing, it is possible to cope with a large cutting load at the center of the cutting edge 4.

[0038] As shown in Fig. 4 (a), the outer periphery of the cylindrical blade receiving portion 7 is also slit in the same manner as the fixed blade receiving portion 5. A groove 10 is formed. Specifications such as the interval and depth of the slit groove 10 are substantially the same as those of the slit groove of the fixed blade receiving portion 5 described above. By making the slit groove specifications of both blade receiving parts the same, aligning both slit grooves and fitting the cylindrical blade receiving part 7 to the shaft part 3, each slit groove of the cylindrical blade receiving part 7 becomes a fixed blade. Since they correspond to the slit portions of the receiving portion 5, the slit grooves of the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7 are apparently continuous, and a slit groove into which the cutting blade 4 can be inserted is obtained. In this state, the cylindrical blade receiving portion 7 is fixed to the fixed blade receiving portion 5. For example, as shown in FIG. 4, the fixing means is formed in the cylindrical portion of the cylindrical blade receiving portion 7 by penetrating in the cylindrical axis direction from the side end surface to form two bolt holes 19, and if necessary, the cylindrical blade receiving portion 7 Can be obtained by finely adjusting the fixed blade receiving part 5 and fixing with a bolt. The fixing of the cylindrical blade receiving portion 7 will be described later. Further, for example, four screw holes 20 are provided around the cylinder at the end of the cylindrical blade receiving portion 7 opposite to the fixed blade receiving portion 5. These screw holes 20 are used to fix the ring 6 disposed on the outside of the cylindrical blade receiving portion 7, a holding plate 12 described later, and the like to the cylindrical blade receiving portion 7 with bolts 22.

[0039] The material of the cylindrical blade receiving portion 7 is usually the same as that of the fixed blade receiving portion 5 due to the retention of the cutting blade 4 and the workability of the slit groove 10, but is not limited thereto.

Next, the ring 6 will be described with reference to FIG. (A) in FIG. 5 is a side view of the ring 6, and (b) is a cross-sectional view taken along the CC section of (a). In this example, the two rings provided between the fixed blade receiving part 5 and the cylindrical blade receiving part 7 and the two rings provided outside the cylindrical blade receiving part 7 (end part of the blade receiving part) have the same dimensions. (Shape). FIG. 5 shows a ring provided outside the cylindrical blade receiving portion 7 as a representative of these.

[0041] Each ring 6 of the cutter roll 1 in the present cutting apparatus has a donut shape having an inner diameter substantially the same as the outer diameter of the shaft portion 3, and the outer peripheral surface thereof is a bottom surface of the slit groove 10 of the blade receiving portion. Designed to be the same or slightly higher than the bottom. The outer peripheral surface may be either a smooth surface or a shallow groove surface that can receive the lower end of the cutting blade attached to the slit groove of the blade receiving portion. The lower end of the cutting blade 4 attached to the slit groove 10 is supported by contact engagement with the bottom surface of the slit groove 10 as described above in the conventional cutting device. The Thereby, the lower end of the cutting blade 4 does not substantially contact the bottom surface of each slit groove 10 of the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7, so that the strand cutting Sometimes all or most of the load applied to the cutting edge 4 is supported by the ring 6.

[0042] The width of the ring 6 is not limited, but is typically about 3 to 35 mm. If the width of the ring 6 is too small, the cutting load of the cutting edge is concentrated as will be described later, so that the ring 6 is likely to be worn and the cutting edge may be damaged. On the other hand, if the width of the ring 6 is too large, the cutting edge at the time of cutting in the ring 6 part is not stable because the lower end is in contact with the ring 6 and it is difficult to cut the strand well. Otherwise, the cutting blade may be damaged by force. In FIG. 5 (a), reference numeral 26 denotes a bolt hole for fixing the ring 6. In the ring 6 provided between the fixed blade receiving portion and the cylindrical blade receiving portion, this bolt hole is provided corresponding to the bolt hole 19 (see FIG. 4) of the cylindrical blade receiving portion 7.

In the present cutting apparatus, a plurality of rings 6 are provided in the longitudinal direction of the blade receiving portion of the cutter roll 1 as described above. In this example, as shown in FIG. 1, a total of four rings 6 are provided between the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7 and outside the cylindrical blade receiving portion 7 at almost equal intervals. The number of rings 6 is not limited to this. For example, when the length of the cutting blade is short, although not shown, a cylindrical blade receiving portion is fitted on only one side of the fixed blade receiving portion to form a blade receiving portion, and the ring is fixed between the two blade receiving portions. Provided on the outer side of each of the blade receiving part and the cylindrical blade receiving part (end part of the blade receiving part), the lower end of the cutting blade held by the blade receiving part can be supported by three rings.

[0044] In the present cutting apparatus, it is preferable that all the rings 6 mounted on the cutter roll are seamless donut-shaped rings as shown in FIGS. 5 (a) and 5 (b). Such an integrated ring has excellent manufacturing characteristics and can avoid receiving a cutting edge at the joint. However, it is not limited to this, but at least a part of the ring attached to the cutter roll may be formed into a donut shape in accordance with, for example, two semicircular rings attached to the cutter roll (not shown). Good. Because these separable rings have seams

When the lower end of the cutting edge is received at the joint portion, the incidence of cutting edge damage (blade breakage) may be higher than that of the one-piece ring.

[0045] By thus providing a plurality of rings 6 spaced apart in the longitudinal direction of the blade receiving portion, the lower end of the cutting blade 4 held by the blade receiving portion is supported at a plurality of locations separated in the longitudinal direction. If you use a seamless donut-shaped ring 6, all cutting edges Can be supported on the outer periphery of the ring 6 on average.

In this cutting apparatus, the ring 6 is formed of a material harder than the material of the blade receiving portion of the cutter roll 1. The cutting blade 4 is made of a hard material with a hardness of about 800H, for example.

V

As the material of the cutter roll 1, for example, a precision steel layer of the slit groove 10, such as carbon steel for machine structure “S45C” is preferably used. The hardness of the blade receiving portion made of strong carbon steel is about 400-500H as described above, but the slit groove 10 into which the cutting blade 4 is inserted 10

V

The hardness of the part decreases because it is formed in the inner center of the blade receiving part, and is usually around 200H.

V

[0047] This cutting device substantially supports the lower end of the cutting blade 4 with a hard material ring 6, and reduces the wear of the bottom of the slit groove 10 by the cutting blade 4 as a material of the ring 6. The material used is harder than the blade holder. The hardness of the ring 6 may vary depending on the hardness of the cutting blade 4. Specifically, for example, a material having a hardness of about 500 to 900H is preferred 700 to 800H

V

A degree of hardness is more preferred. Examples of the material of the ring 6 that can achieve such hardness are

V

Examples thereof include carbon steel for machine structural use, chromium molybdenum steel, manganese steel, manganese chromium steel, and the like. Among these, chromium molybdenum steel SCM3 can be preferably used. In addition, the steel material may be surface treated or quenched.

[0048] In the cutter roll 1 of the present cutting apparatus, wear due to the cutting blade 4 of the ring 6 can be reduced as the hardness of the ring 6 increases, but the hardness of the ring 6 becomes extremely larger than the hardness of the cutting blade 4. This is preferable because the cutting blade 4 may be damaged or worn. Therefore, the hardness of the ring 6 is preferably the same as or slightly lower than that of the cutting edge 4.

[0049] Further, in the case where a plurality of lower ends of the cutting blade 4 are supported by the ring 6, the ratio of the portion supported by the ring 6 is the ratio of the blade receiving portion and the portion of the cutting blade 4 held by the ring. 5 to 50% of the length dimension is preferred, and 10 to 30% is more preferred. This is described in detail according to Fig. 1. When the length of the part of the cutting blade 4 held by the blade holder of the cutter roll 1 and the ring is a, and the total width of the part supported by the four rings 6 of a is b, a The ratio of b to is preferably 5-50%. b is the total width (b = bl + b2 + b3 + b4) when the widths of the four rings 6 are bl, b2, b3, and b4, respectively. If the ratio of b to a is less than 5%, the ring 6 receives the cutting load of the cutting blade 4 intensively. As a result, the wear amount of the cutting blade 4 may increase and the ring 6 and the cutting blade 4 may be damaged. In addition, when the ratio of b to a is 50% or more, the ratio of the cutting edge 4 held by the slit groove 10 of the blade receiving portion 3 becomes small, and more than half of the cutting edge 4 is not held by the slit groove 10. Therefore, the holding of the cutting blade 4 may become unstable, and good cutting may not be obtained. Although bl, b2, b3, and b4 are preferably the same or substantially the same, they may be different as long as the cutting blade can be stably supported.

[0050] In the present cutting apparatus, as shown in FIG. 1, a discharging means for removing chopped strands cut by the cutting blade 4 of the cutter roll 1 from between the cutting blades 4 is attached to the blade receiving portion. It is preferably provided between the blades 4. This type of discharge means is basically the same as that known for a single roll of glass fiber strands. As the discharging means, the wire rod 27 stretched in parallel with the cutting blade 4 between the separated cutting blades as in this example, (a) chopped strands that are cut using elastic force can be reliably This is preferable in that it can be eliminated from between the cutting blades, (b) it is a wire rod, is lightweight and can be less affected by centrifugal force, and (c) can be easily mounted on the cutter roll 1. However, the present invention is not limited thereto, and may be a thin plate as disclosed in Patent Document 2, for example.

[0051] The wire rod 27 is preferably a steel wire, particularly a piano wire, which is preferably an elastic material having a high tensile strength and a high tensile strength. Steel wire can be used as a single wire or as a stranded wire made by twisting multiple fine wires. Further, a force that normally stretches one wire rod 27 between the cutting edges 4, for example, when the distance between the cutting edges 4 is large, two or more may be provided as necessary.

In this example, the wire rod 27 can be stretched by the holding plate 12 shown in FIG. The holding plate 12 is made of an elastic plate material or a donut-shaped plate cut out from a spring steel plate, and slits 23 are formed on the outer peripheral portion corresponding to the number of cutting blades 4 attached to the blade receiving portion. A notch 25 for attaching the wire rod 27 is provided in the peripheral portion near the outer periphery between the two. Bolt holes 20 ′ (four in this example) are formed in a portion close to the inner periphery. FIG. 7 is a partially enlarged view of FIG. 6, and the state of the slit 23 and the cut 25 can be understood in detail. After the holding plate 12 is attached to the outside of the blade holders 11 on both sides, the wire rod 27 can be stretched by engaging both ends of the wire rod 27 with the notches 25 of the holding plate 12. In other words, it is arranged on the blade receiving part. The wire rod 27 can be stretched between the cutting edges 4 by using the elasticity of the holding plate 12 slightly outside the cutting edge of the cutting edge 4. Note that the method of locking the wire 27 to the holding plate 12 can be changed as appropriate.

[0053] If slits 23 (see Fig. 7) are formed on both sides of the notch 25 as in this example, the portions separated by the slits 23 on both sides function as spring pieces. The spring action on the stretched wire rod 27 can be made stronger, and each wire rod 27 can easily operate by changing its tension separately. Further, the tension of the wire rod 27 stretched on the holding plate 12 can be adjusted as needed for each wire rod or by changing the distance between the holding plates 12 as necessary. Powerful adjustment is also possible by known methods.

[0054] The wire stretched between the cutting edges as described above normally stands by slightly outside the tip of the cutting edge, but when pressed against the receiving roll as the cutter roll rotates, At the same time, it is pushed in between the cutting blades, and at the same time, both ends of the wire are drawn toward the center of the wire, so the holding plate crawls inward. When the wire is released away from the receiving roll, the wire pushed between the cutting blades moves in the radial direction of the cutter roll due to the elasticity of the holding plate and returns to the original position. Bounce the chopped strand between the cutting blades outward and discharge.

[0055] The cutter roll 1 in the present cutting apparatus can be obtained by the following procedure. That is, as shown in FIG. 8, the ring 6 is fitted to the shaft portions 3 on both sides of the fixed blade receiving portion 5 which is substantially integrated with the shaft portion 3, and the cylindrical blade receiving portion 7 is then fitted to the outside thereof. The bolt 21 is passed through the bolt hole 19 provided in the cylindrical blade receiving part 7 and the bolt hole 26 provided in the ring 6 and screwed into the screw hole 18 (see FIG. 3) of the fixed blade receiving part 5. Secure 6 and cylindrical blade receiving part 7 to fixed blade receiving part 5. At that time, the slit groove formed on the outer periphery of the fixed blade receiving portion 5 and the slit groove of the cylindrical blade receiving portion 7 are aligned. As a result, the cylindrical blade receiving portion 7 is fixed in the circumferential direction and the axial direction of the shaft portion 3, and the ring 6 is sandwiched and fixed between the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7, and the fixed blade receiving portion 5 and Each slit groove formed on the outer peripheral surface of the cylindrical blade receiving portion 7 forms an apparently continuous slit groove.

[0056] Next, after the ring 6 is fitted to the shaft portion 3 on the outside of the cylindrical blade receiving portion 7 fixed to the shaft portion 3, the lower end portion of the cutting blade 4 is inserted into the slit groove, and further required. Accordingly, insert a spacer 9 between the slit groove and the cutting blade 4 and attach the cutting blade 4 to the blade receiving portion of the cutter roll 1. Next, the blade retainer 11 is fitted to the boss portion 14 of the cutter roll 1, and the end of the cutting blade 4 is fixed by the blade retainer 11. That is, an annular projecting portion 28 is provided on the inner peripheral portion of the blade presser 11, and recesses that engage with the annular projecting portion 28 are provided on both ends of the cutting blade 4 and the spacer 9. By engaging the projection and the recess, the cutting blade 4 and the spacer 9 are locked so as not to be separated from the slit groove of the blade receiving portion. Further, the holding plate 12 is applied to the outer side of the blade retainer 1 1, and in this state, the borerole 22 is passed through the blade retainer 11 and the borerole hole 26 of the ring 6 (see FIG. 5 (a)), and the screw of the cylindrical blade receiving part 7. Screw into hole 20 (see Fig. 4).

Accordingly, the cutting blade 4 and the spacer 9 are fixed in the longitudinal direction and the radial direction of the blade receiving portion.

The lower end of the cutting blade 4 is in contact with the two rings 6 provided between the fixed blade receiving portion 5 and the cylindrical blade receiving portion 7 and the two rings 6 provided outside the cylindrical blade receiving portion 7. The cutting edge 4 is supported by these rings 6. The wire rod 27 that is a discharging means of the chopped strand is attached to the holding plate 12 fixed with bolts 22.

Example

[0058] With the three types of cutter rolls of Example 1, Example 2 and Example 3 and a receiving roll made of urethane rubber, five cutting devices were prepared for each cutter roll, and glass fiber strands (average fiber diameter 10 0 A bundle of 1000 μm Ε glass filaments) is continuously cut using these cutting devices under the same cutting conditions (peripheral speed of the cutter roll: 500 m / min), and a chopped strand of about 3 mm is obtained. Manufactured.

[0059] In the experiment, the production of chopped strands was performed 19 times (total 95 times) for 8 hours with 5 cutting devices for each cutter roll. During this period, the cutter roll and the receiving roll were observed. The frequency of damage (blade breakage) of the cutting blade and the replacement frequency of the receiving roll were investigated. The frequency of blade breakage is the total number of blade breaks that occurred during a total of 95 cuttings, and the replacement frequency of the receiving roll is the total number of replacements during the above cutting.

[0060] The cutter roll of Example 1 has a conventional structure having no ring at the blade receiving portion, and the cutter rolls of Examples 2 and 3 have substantially the same basic structure as the cutter roll shown in FIG. In the cutter rolls of Example 2 and Example 3, the two rings provided at both ends of the blade receiving portion are both a seamless integral type, but both sides of the fixed blade receiving portion (the fixed blade receiving portion and the cylindrical blade receiving portion and The two central rings provided in the middle of the In contrast, Example 3 used a seamless, integral ring. The results are shown in Table 1. In Table 1, Example 1 is a comparative example, and Examples 2 and 3 are examples.

[0061] All other conditions except the above structure of the cutter roll are the same, the hardness of the cutting blade is 800H, and the hardness of the blade receiving portion of the cutter roll (slit groove portion into which the cutting blade is inserted) is 2

V

00H and ring hardness 700H were used.

V V

[0062] [Table 1]

(Remarks)

a: The part attached to the blade receiving part of the cutting blade

b: Total width of the part supported by the ring

[0063] As shown in Table 1, with the conventional cutter roll of Example 1 (comparative example), blade breakage occurred 37 times (blade breakage rate: 38 · 9%) during 95 times of cutting, and the receiving roll was 57 Replacement was necessary. On the other hand, in Example 2 (Example) in which the cutting blade is supported by two integral types arranged at both ends and two separate types arranged in the center, the number of times the blade breaks is 12 (blade breaking rate: 12). 6%), the frequency of receiving roll replacement decreased to 19 times, and both decreased to 1/3 of Example 1.

[0064] In addition, in Example 3 (Example) using a single ring with no joint between the above two rings arranged in the center, blade breakage was improved once (blade breakage rate: 1.1%) We were able to.

Industrial applicability

[0065] Since the present invention can reduce wear and damage to the receiving roll due to the blade receiving portion of the cutter roll, the replacement frequency of the cutter roll and receiving roll can be reduced, and high quality chopped strands can be produced with high productivity. Applicable to manufacture. It should be noted that the Japanese patent application 2005-337627 filed on November 22, 2005, Akita Ida, the entire contents of the claims, drawings and abstract are cited here, and the description of the present invention is disclosed. It is included as an indication.

Claims

The scope of the claims

[1] A rotating receiving roll and a cutter roll in which a large number of cutting blades are radially spaced around the periphery and are arranged in the axial direction. The cutting blade is formed on the outer periphery of the blade receiving portion of the cutter roll. Glass fiber strand cutting, which is attached by inserting a lower end portion into a slit groove, rotates the cutter roll in pressure contact with the receiving roll, and cuts the glass fiber strand sent between both rolls with the cutting blade. The blade holder of the cutter roll is a fixed blade receiver that is substantially integral with the shaft, and a cylinder that is detachably fixed to both or one side of the fixed blade receiver. A ring made of a material harder than the blade holder of the cutter roll is provided between the both ends of the blade receiver and the fixed blade receiver and the cylindrical blade receiver. Contact the ring Cutting apparatus for a glass fiber strand, characterized in that is engaged to substantially support the cutting load of the cutting edge in the ring.

[2] The cutter roll blade receiving portion is formed of a fixed blade receiving portion that is substantially integrated with the shaft portion, and cylindrical blade receiving portions that are detachably provided on both sides of the fixed blade receiving portion. 2. The glass fiber strand cutting device according to claim 1, wherein the glass fiber strand cutting device is disposed between the fixed blade receiving portion and the cylindrical blade receiving portion and at an end of each cylindrical blade receiving portion opposite to the fixed blade receiving portion.

3. The glass fiber strand cutting device according to claim 2, wherein all of the rings are seamless donut-shaped rings.

[4] The length of the portion of the cutting blade held by the cutter roll blade receiving portion and the ring is (a), and the total width of the portion held by the ring of (a) is (b). The glass fiber strand cutting device according to claim 1, 2 or 3, wherein the ratio of (b) to (a) is 5 to 50%.

5. The glass fiber strand cutting device according to any one of claims 1 to 4, wherein the hardness of the ring is the same as or softer than the hardness of the cutting edge.

6. The glass fiber strand cutting device according to any one of claims 1 to 5, wherein the cutting blade is provided on an outer periphery of a blade receiving portion of the cutter roll in parallel with a rotation axis of the cutter roll.

[7] A discharge means for removing the cut glass fiber strand from between the cutting blades is provided between the cutting blades radially disposed on the outer periphery of the blade receiving portion of the cutter roll. Item 6. A fiberglass strand cutting device according to any one of Items 1 to 6. The discharge means is a wire rod elastically stretched in parallel with the cutting blade between the cutting blades, or a thin plate laid in parallel with the cutting blade between the cutting blades. The glass fiber strand cutting device according to claim 1.