JP2000246529A - Cutter for belt cutting and manufacture of transmission belt using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily set a V-grooved pitch by changing a spacer and to improve the generality of a disc-shaped cutter by assembling a plurality of disc cutters having cutting parts arranged at prescribed intervals along the circumferential direction into an incorporation boss part via spacers and fixing them mechanically. SOLUTION: A cutter 12 for belt cutting is arranged in a drive roll 10 side or a driven roll 11 side, and a plurality of V-grooves on the surface of a traveling vulcanized sleeve 8 are polished at a time. This cutter 12 is so formed that disc cutters 15 having V-cross sectional cutting parts arranged at prescribed intervals along the circumferential direction are assembled into the shaft 17 of an incorporation boss 16 via cylindrical spacers 18, and these are mechanically fixed by a bolt 19. This constitution can arbitrarily set the pitches of the V-grooved parts by changing the spacers 18 interposed between the disc cutters 15. The assembling of the disk cutters 5 and the spacers 18 can economically machine the V-grooved parts of different pitches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for cutting a belt and a method of manufacturing a power transmission belt using the same, and more particularly, to changing a pitch of a V-groove by replacing a spacer interposed between the disc-shaped cutters. The present invention relates to a belt cutting blade that can be set arbitrarily and can process several types of V-groove portions with the same type of disk-shaped blade, and a method of manufacturing a power transmission belt using the same.

[0002]

2. Description of the Related Art A conventional V-ribbed belt is obtained by vulcanizing a reverse molded body obtained by laminating a canvas, an upper rubber layer, a tensile member, and a lower rubber layer on a mandrel as shown in Japanese Patent Publication No. 52-17552. The resulting vulcanized sleeve has been manufactured by a grinder method in which a plurality of V-shaped grooves are ground by a grinding wheel in which a cylindrical surface portion and a portion having a plurality of V-shaped grooves are connected and integrated.

[0003] Recently, a long V-ribbed belt is run by hanging a vulcanized belt sleeve on a driving roll and a driven roll, and polishing the surface of the running belt sleeve into a V-groove shape by a grinding wheel. Being manufactured. The grinding wheel used here has a polishing portion that relatively extends in the circumferential direction between slits that extend in the width direction at regular intervals in the circumferential direction. This polished portion had convex portions having a triangular cross section along the width direction at regular intervals, and diamonds were mounted on the surface thereof.

However, in the conventional grinding wheel, since the length of the polished portion along the circumferential direction is large, when the belt sleeve is processed, a large amount of heat is generated in the sleeve, vulcanization returns, and the processing is performed with high precision. However, there has been a problem that power consumption during processing is increased.

[0005] For this reason, cutting tools have recently been reviewed together with grinding wheels having diamonds mounted thereon. This blade is a disk-shaped blade having cutting portions arranged at predetermined intervals along the circumferential direction and fixed to a flange portion for pitch adjustment, and the flange portion of each disk-shaped blade is attached to a rotating shaft of a processing machine. The pitch of each disk-shaped blade was adjusted by inserting and fixing.

[0006]

However, when a conventional knife having a flange portion for pitch adjustment is used, each of the knifes is made to be dedicated to various kinds, so that the pitch of the knife having the same shape with the flange portion is required. If the difference is at least 0.5 mm, there is a problem that the pitches of the plurality of ground V-shaped portions are also different. In addition, even if the blades of the same pitch have different shapes of the blade edges, the blades cannot be used. Therefore, even for a small number of products, it is necessary to prepare a blade-equipped blade that matches the pitch of the V-shaped groove.

The present invention has been made in view of the above-mentioned situation, and is intended to cope with this situation. The pitch of the V-shaped groove can be arbitrarily set by replacing the spacer interposed between the disk-shaped blades. The present invention provides a belt-cutting blade capable of economically processing several types of V-groove portions with the disk-shaped blade, and a power transmission belt using the same.

[0008]

That is, according to the first aspect of the present invention, a cylindrical vulcanization sleeve in which a core wire is embedded in a rubber layer is hung on a driving roll and a driven roll to a predetermined tension. A belt cutting tool, which is made to run under a running surface and abut the running vulcanizing sleeve to simultaneously cut a plurality of V-groove portions on the surface of the vulcanizing sleeve, at a predetermined interval along the circumferential direction. A plurality of disk-shaped blades with cutting parts arranged therein are assembled and combined with the boss part via spacers, and these are mechanically fixed on a belt cutting blade, and do not have a conventional flange part disk Since a blade is used, the pitch of the V-shaped groove can be set arbitrarily by replacing a spacer interposed between the disk-shaped blades. In addition, since one set of disc-shaped blades can be used in combination with other spacers having different widths and V-groove portions having different pitches can be machined, one set of disc-shaped blades can be effectively used, and economical. It is possible to perform cutting work.

According to the second aspect of the present invention, at least one cylindrical vulcanization sleeve having a core wire embedded in a rubber layer is provided.
A roll is attached or hung on one roll to run under a predetermined tension, and further, the running vulcanization sleeve is brought into contact with a cutting tool for belt cutting attached to a processing machine to form a plurality of V-grooves on the surface of the vulcanization sleeve. In the method for manufacturing a V-ribbed belt, the plurality of disc-shaped blades having cutting portions arranged at predetermined intervals along a circumferential direction are incorporated as the above-mentioned blades for belt cutting, and the spacers are mounted on the boss portion. Through a combination of these and mechanically fixing these
In the method for manufacturing a ribbed belt, the pitch of the V-groove portion can be arbitrarily set by replacing the spacer interposed between the disk-shaped blades in the same manner as in the invention according to claim 1, so that one disk-shaped blade can be formed. Thus, the machining of V-shaped grooves having several pitches can be performed economically.

[0010]

FIG. 1 is a partial sectional view of a belt sleeve used in the present invention. A tension layer 3 in which one or a plurality of cover canvases 2 are wound around a cylindrical forming drum 1 is shown. A cushion rubber layer 4, a core wire 5 made of a spirally wound rope embedded in the cushion rubber layer 4, and a compression rubber layer 6 are sequentially laminated. This laminate is vulcanized to form a vulcanized sleeve 7.

The compressed rubber layer 6 is made of chloroprene, hydrogenated nitrile rubber, chlorosulfonated polyethylene rubber,
Rubbers selected from fluororubbers and ethylene-alpha-olefin elastomers are used. Among them, ethylene-alpha-olefin elastomers such as ethylene-propylene rubber (EPR) or ethylene-propylene-diene rubber (EPDM) are used. It is preferable because it has excellent heat resistance and cold resistance and is a relatively inexpensive polymer.

A typical example of the above-mentioned ethylene-alpha-olefin elastomer is EPDM, which is a rubber comprising an ethylene-propylene-diene monomer. Examples of diene monomers include dicyclopentadiene, methylene norbornene, ethylidene norbornene, 1,4-hexadiene, cyclooctadiene, and the like. Also, ethylene-propylene rubber (EPR) can be used.

For crosslinking of the rubber, an organic peroxide is used. For example, dicumyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, benzoyl peroxide, 1,3-bis (t -Butylperoxyisopropyl) benzene, 2,5-dimethyl-
2,5-di (t-butylperoxy) hexyne-3,
2,5-dimethyl-2,5- (benzoylperoxy)
Hexane, 2,5-dimethyl-2,5-mono (t-butylperoxy) hexane and the like can be mentioned. This organic peroxide is used alone or as a mixture in the range of 0.005 to 0.02 mol g per 100 g of the ethylene-alpha-olefin elastomer.

[0014] By blending a crosslinking aid (co-agent), the degree of crosslinking can be increased to prevent problems such as adhesive wear. Examples of the crosslinking aid include TIAC, TAC, 1,2 polybutadiene, metal salts of unsaturated carboxylic acids, oximes, guanidine, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, NN′-m- It is usually used for peroxide crosslinking such as phenylene bismaleimide and sulfur. And, if necessary, carbon black, reinforcing agents such as silica, fillers such as calcium carbonate and talc, plasticizers, stabilizers, processing aids, and ordinary rubber compounds such as coloring agents. What is used is used.

Short fibers made of nylon 6, nylon 66, polyester, cotton, and aramid are mixed into the compressed rubber layer 4 to improve the lateral pressure resistance of the compressed rubber layer 4 and to be in contact with the pulley. The short fibers protrude from the surface of the compressed rubber layer 4 to reduce the friction coefficient of the compressed rubber layer 4 and reduce noise during belt running. Of these staple fibers, aramid staple fibers having rigidity, strength and abrasion resistance are most effective.

In order for the aramid short fiber to sufficiently exhibit the above-mentioned effects, the fiber length of the aramid fiber should be 1 to 20.
mm, the amount of addition is 1 to 3 with respect to 100 parts by weight of rubber.
0 parts by weight. The aramid fiber is an aramid having an aromatic ring in its molecular structure, such as, for example, Conex, Nomex, Kevlar, Technora, Twaron and the like.

If the amount of the aramid short fiber is less than 1 part by weight, the rubber of the compressed rubber layer 4 tends to stick and wear, and if it exceeds 30 parts by weight, the short fiber will be reduced. It is not evenly dispersed in rubber. However, the addition of this aramid short fiber is not essential, and may be the one to which short fibers made of other materials are added.

The compressed rubber layer 4 has an ethylene-alpha-olefin elastomer and a fiber diameter of 1.0 μm or less, preferably 0.05 to 500 parts by weight, based on 100 parts by weight of an ethylene-alpha-olefin elastomer as a matrix rubber. The fiber may contain 1 to 50 parts by weight, preferably 5 to 25 parts by weight of a short fiber reinforced rubber grafted with 0.8 µm short fibers. If the blending amount of the short microfiber reinforced rubber is less than 1 part by weight, abrasion resistance is not sufficient, and if it exceeds 50 parts by weight, elongation of the rubber composition is reduced, and heat resistance and bending resistance are reduced.

As shown in FIG. 2, the vulcanizing sleeve 8 is run under a predetermined tension between the driving roll 10 and the driven roll 11 so that the compressed rubber layer 6 is located on the front side, and runs.
The running speed of the vulcanizing sleeve 8 is not particularly limited.

Further, the blade cutting blade 12 according to the present invention mounted on the processing machine is disposed on the driving roll 10 or the driven roll 11 side, and is moved so as to abut the vulcanizing sleeve 8 during traveling to perform vulcanization. 3 to 100 on the surface of the sulfur sleeve 8
The plurality of V-groove portions 9 are polished at a time. The rotation direction of the belt cutting blade 12 may be the same as or opposite to that of the vulcanization sleeve 8. The rotation speed of the blade 12 is 400 to 2,000 rpm.

The cutting tool 12 for belt cutting used here
As shown in FIGS. 3 to 5, a disk-shaped blade 15 having a V-shaped cross section 14 disposed at predetermined intervals along the circumferential direction is assembled, and a cylindrical boss 16 is mounted on a shaft 17 of a boss 16. These are assembled via spacers 18 and are mechanically fixed by bolts 19. At the same time, each of the disk-shaped blades 15 is inserted into a locking pin 20 such as a bolt or a pin inserted into the assembling boss portion 16 or the spacer 18 and overlapped with each other.
There is also a method of positioning with the positioning holes 19 provided in the above.
Further, when a plurality of disc-shaped blades 15 are overlapped and the cutting portion 14 at the tip end of the blades is aligned in the circumferential direction, that is, in the case of so-called offset, a plurality of positioning holes 21 can be provided in the circumferential direction.

The spacer 18 is fitted onto the shaft 17 of the assembly boss 16 without play, and the disk-shaped blade 15
The interval is adjusted. This is made of a hard material such as a metal, a synthetic resin, and a ceramic material.

Hereinafter, a method of manufacturing a V-ribbed belt using the blade of the present invention will be described. First, the vulcanizing sleeve 8 used in the method for manufacturing a V-ribbed belt of the present invention.
The cover canvas 2 is made of a plain woven fabric made of cotton yarn for both the warp and the weft, and one ply of a rubber elastic stretch fabric of a wide-angle canvas having a crossing angle of about 110 ° is used. The cushion rubber 4 is made of chloroprene rubber. A cord made of polyester fiber is used as the wire 5, a chloroprene rubber is used as the compression rubber layer 6, 8 vol% of nylon fiber having a length of 6 mm and a length of 3
A 3 mm-% aramid fiber cut yarn of 3 mm was arranged in the width direction of the sleeve and mixed. The method for manufacturing the vulcanized sleeve 8 is obtained by reverse molding as shown in FIG.

As shown in FIG. 2, the vulcanizing sleeve 8 is hung on a driving roll 10 and a driven roll 11 under a predetermined tension and allowed to run, and simultaneously, N pieces of 16 mm thick disk-shaped blades are mounted on a 7 mm thick blade. The blade cutting blade 12 with the spacer 18 interposed therebetween is moved in the opposite direction to the vulcanizing sleeve 8 by 1,800 rpm.
After rotating m times, the vulcanization sleeve 8 was brought into contact with the vulcanization sleeve 8, and a plurality of V-groove portions 9 were polished on the surface at once. The depth of the groove portion 9 was about 10 mm, and the polishing time (the time from when the blade 12 came into contact with the belt surface until the entire circumference was cut) was about 2 minutes.

As shown in FIG. 6, a V-ribbed belt 25 obtained by cutting a cut sleeve into a predetermined width is formed by bonding a cord 26 made of a polyester fiber cord to the adhesive rubber layer 2.
7 and a compressed rubber layer 2 which is an elastic layer underneath.
Eight. The compression rubber layer 28 is provided with a plurality of ribs 29 having a substantially triangular cross section and extending in the longitudinal direction of the belt.

In the present invention, as shown in FIG. 7, the low-edge banded belt 30 can also be manufactured by cutting a vulcanized sleeve in the same manner as in the above method. When cutting this belt, unlike the above-described V-ribbed belt 25, it is necessary to cut the V-groove portion 9 beyond the position of the core wire 26. The belt 30 has an adhesive rubber layer 27 including a cord 26 made of a cord made of polyester fiber and aramid fiber, and a compression rubber layer 28 as an elastic layer below the adhesive rubber layer 27. With canvas. The compressed rubber layer 28 is provided with a plurality of V-shaped grooves 9 having a substantially triangular cross section and extending in the longitudinal direction of the belt. The tip of the V-shaped groove 9 extends beyond the position of the core wire 26.

[0027]

As described above, according to the first aspect of the present invention, a cylindrical vulcanization sleeve having a core wire embedded in a rubber layer is suspended on a driving roll and a driven roll under a predetermined tension. It is a belt cutting blade that can run and abut a running vulcanization sleeve to simultaneously cut a plurality of V-groove portions on the surface of the vulcanization sleeve, and at predetermined intervals along the circumferential direction. A plurality of disk-shaped blades with cutting parts arranged are combined with a boss part via a spacer, and these are mechanically fixed to a belt-cutting blade, and a conventional disk-shaped blade without a flange part is used. For use, the pitch of the V-groove portion can be arbitrarily set by replacing the spacer interposed between the disc-shaped blades, and the pitch of the V-groove portion having a different pitch can be set by combining the disc-shaped blade with the spacer. It is possible to perform the factory economically.

According to a second aspect of the present invention, there is provided a method of manufacturing a V-ribbed belt, wherein a plurality of V-groove portions are simultaneously cut on the surface of a vulcanized sleeve by using the cutting tool for belt cutting according to the first aspect. The pitch of the V-groove portion can be arbitrarily set by replacing the spacer interposed between the disk-shaped blades as in the first aspect of the invention, and combining the same type of disk-shaped blade and the spacer. This has the effect that V-shaped grooves having different pitches can be processed economically.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a belt sleeve used in the present invention.

FIG. 2 is a front view showing a state in which a vulcanization sleeve is being ground by a blade for belt grinding.

FIG. 3 is a partial sectional view of a blade for belt grinding according to the present invention.

FIG. 4 is a plan view of a disk-shaped cutting tool for belt grinding used in FIG. 3;

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a partially enlarged view of a V-ribbed belt obtained by the method of the present invention.

FIG. 7 is a sectional view of a low edge banded belt obtained by the method of the present invention.

[Explanation of symbols]

 Reference Signs List 8 vulcanization sleeve 9 V-groove portion 10 drive roll 11 driven roll 12 blade for blade cutting 14 cutting portion 15 disk-shaped blade 16 built-in boss 18 spacer

Continued on the front page (72) Inventor Mitsuo Funabashi 4-1-1, Hamazoe-dori, Nagata-ku, Kobe Mitsusei Belt Co., Ltd. F-term (reference) 3C022 AA02 AA03 AA07 AA10 BB02 EE02 EE07 EE13 EE17 JJ00 JJ18

Claims (2)

[Claims] A cylindrical vulcanization sleeve having a core layer embedded in a rubber layer is run on a driving roll and a driven roll under a predetermined tension, and is brought into contact with the running vulcanization sleeve. A plurality of V-shaped grooves are simultaneously cut on the surface of the vulcanization sleeve, and a plurality of disk-shaped blades having cutting portions arranged at predetermined intervals along the circumferential direction are incorporated in the blade cutting blade. A cutting tool for belt cutting, wherein the boss is combined with a spacer via a spacer, and these are mechanically fixed. 2. A vulcanization sleeve having a rubber core in which a core wire is embedded is mounted or hung on at least one roll and run under a predetermined tension, and further processed into a running vulcanization sleeve. In a method for manufacturing a power transmission belt obtained by simultaneously cutting a plurality of V-groove-shaped portions on the surface of a vulcanized sleeve by bringing a blade for belt cutting into contact with a cutting machine, the above-mentioned circular blade is used as the above-mentioned blade for cutting. A power transmission belt characterized in that a plurality of disc-shaped blades having cutting portions arranged at predetermined intervals along a circumferential direction are combined with a boss portion via a spacer, and those which are mechanically fixed are used. Production method.