JP3685828B2 - Low-edge V-belt V-shaped cutting device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a V-shaped cutting device for a low edge V-belt.
[0002]
[Prior art]
In general, the low edge V-belt has a large friction coefficient and is capable of high transmission, and is characterized by a long belt life due to special processing of rubber. Therefore, in recent years, the range of use as an automobile belt has been expanded.
[0003]
Conventionally, there is a technique shown below as an apparatus for cutting a side surface of a low edge V-belt into a V shape.
[0004]
(A) Reverse forming into a cylindrical sleeve (meaning that the front and back of the belt are reversed, because the V belt is narrower on the back side, so it is easier to cut from the back side, the same applies hereinafter) After vulcanization, this is inserted into and fixed to a roll, and while the molded body is rotated, a polishing wheel or a polishing plate made of a group of grindstones having a V-shaped cross section is pressed on the roll, and the molded body is pressed. There is an apparatus for manufacturing a plurality of low edge V belts at the same time by polishing V-shaped grooves on the surface and then cutting the molded body at the V-shaped groove portions. There are U.S. Pat. No. 3,818,576 and JP-A-2-89628 as similar conventional techniques.
[0005]
(B) A belt obtained by reverse molding and vulcanizing into a cylindrical sleeve shape is first cut into a square or rectangular cross section with the width of the V-belt to be manufactured, and the belt is run over the two pulleys while running over the belt. Japanese Patent Application Laid-Open No. 62-253436 discloses a device for cutting a side surface of a belt into a V shape by pressing a pair of milling cutters having different rotation shafts from both sides to the side surface of the belt. It is disclosed.
[0006]
In general, the V-shaped cutting device for the low edge V-belt is circulated by passing the belt over a roll in the same manner as the conventional V-shaped cutting device for the low-edge V-belt described in (A) and (B) above. A belt traveling portion to be cut, a belt processing portion for cutting a side surface of the belt into a V shape, a relative feed between the belt processing portion and the belt traveling portion, and a cutter of the belt processing portion and a belt of the belt traveling portion; It is comprised from the reciprocating movement mechanism which contacts.
[0007]
[Problems to be solved by the invention]
The conventional techniques introduced above have the following disadvantages.
[0008]
(1) In the low edge V-belt manufacturing method shown in (A) of the above-mentioned prior art, heat is generated in the process of grinding the V-shaped groove with a polishing wheel or the like, and the temperature of the sleeve-like belt surface is 100 ° C. or higher. Also reach. For this reason, the intermolecular bond of the rubber on the belt surface is cut to cause vulcanization reversion, which causes a disadvantage that the rubber layer on the belt surface becomes sticky. Further, since the polishing wheel or the like is pressed against the belt surface, the belt surface is deformed by a large strain, and it becomes difficult to grind an accurate V-shaped groove. Furthermore, there is a disadvantage that the material and particle size of the polishing part such as the polishing wheel must be selected and replaced each time depending on the hardness of the sleeve-like belt.
[0009]
(2) In the low-edge V-belt manufacturing apparatus shown in (B) of the above-mentioned prior art, the belts are cut into V-shapes by a milling cutter one by one. However, since the cutter is brought into contact with the belt suspended between the two pulleys from both sides and cut, it is difficult to position the belt due to the escape of the belt and the position of the cutter with respect to the belt is difficult to stabilize. For this reason, it becomes difficult to cut both side surfaces of the belt into an accurate V shape. Although a guide roll for fixing the belt is provided in the vicinity of the cut, it is difficult to fix the position of the belt to withstand the pressing force of the cutter, and the belt is troublesome to attach. Further, since the cutters having different rotating shafts and drive motors are separately pressed from both side surfaces of the belt, it is difficult to make the V-shaped inclinations of the belts coincide.
[0010]
As described in (1) and (2) above, when the V-shape of the low-edge V-belt is not accurate, when the V-belt is attached to the pulley groove, the direction of the V-belt on the pulley changes to radicals. It causes fluctuations in vibration during driving of the V-belt and driving torque transmitted by the belt.
[0011]
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide an apparatus for easily and accurately cutting a side surface of a low edge V belt into a V shape.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a V-shaped cutting device for a low-edge V-belt according to the present invention comprises (1) a belt traveling unit that circulates a belt over a roll (including pulleys), and a cutter. The belt processing part that cuts the side surface of the belt into a V shape, and a relative feed may be provided between the belt processing part and the belt traveling part in order to bring the cutter of the belt processing part into contact with the belt of the belt traveling part. In a V-shaped cutting device for a low-edge V-belt that is provided with a reciprocating mechanism, the cutter of the belt processing portion is set to a true rake angle (an angle formed by a rake surface with respect to a plane perpendicular to the rotation direction of the blade edge). In the embodiment according to the present invention, the angle B shown in FIG.3 (c), which is the same hereinafter), is positive, and a right rake angle (fly When viewed from the axial direction of the cutter, it means the angle formed by the blade edge with respect to the radial direction passing through the outer peripheral edge of the blade edge, and in the embodiment according to the present invention, it means the angle A shown in FIG. The same applies hereinafter) is a minus milling cutter. (2) In addition, the belt processing portion is configured so that the inclination angle of the cone formed by the cutting edge by rotation (which means the angle C shown in FIG. 3B in the embodiment of the present invention) is set on the side surface of the belt. The two milling cutters that are made to coincide with the inclination angle (the angle formed between the base and the hypotenuse of the trapezoidal cross section of the V-belt) cut in a V shape are provided in parallel on the same axis so that the cutting edges face each other, The milling cutter and the belt of the belt running unit are arranged so as to contact each other on the roll of the belt running unit.
[0014]
(3) As described in claim 2, a guide roll for determining a position of a belt traveling on the roll may be provided in the belt traveling portion.
[0015]
(4) As described in claim 3, the reciprocating mechanism may have a structure in which a cam and a follower are combined.
[0016]
[Action]
The low-edge V-belt V-shaped cutting device of the present invention having the above-described configuration has the following effects.
[0017]
(1) Since the right-angle rake angle of the milling cutter equipped in the V-shaped cutting device of the present invention is negative, cutting is performed by sequentially contacting the cutting target belt from the root of the blade tip to the tip. Cutting is similar to drawing. For this reason, when cutting an elastic body such as rubber, the cutting resistance is smaller than when the right angle rake angle is positive, and there is no adverse effect that the belt escapes and the V shape is distorted or burrs occur at the cutting end. On the other hand, since the true rake angle is positive, the cutting edge can be sharp and the cutting surface can be smoothed.
[0018]
Further , according to the V-shaped cutting device for the low-edge V-belt of the present invention , a pair of milling cutters in which the inclination angle of the cone formed by rotating the blade edge is the same as the inclination angle for cutting the side surface of the belt into a V-shape. Are provided on the same axis so that the cutting edges face each other, so that if the space is adjusted so that the space between the pair of milling cutters has the same shape as the cross section of the V belt, By pressing the running belt and the pair of milling cutters so that the belt is sandwiched between the milling cutters, the side surface of the belt can be cut into a V shape easily and accurately. In addition, since the pair of milling cutters are provided in parallel and coaxially with a fixed interval, it is possible to avoid the difficulty of adjusting the V-shaped inclination as in the device described in the prior art (B). Further, when the belt is running on the roll, the two milling cutters and the roll are pressed so as to sandwich the belt, so that the belt can be prevented from escaping and the accuracy of the V-shaped cut can be promoted. .
[0019]
(2) According to the V-shaped cut device for the low-edge V-belt according to the second aspect, since the belt running portion is provided with the guide roll in addition to the roll, the position of the belt passing on the roll is accurately determined. Can do. This contributes to accurately determining the relative position of the belt processing portion and the belt traveling on the roll when the belt processing portion is pressed against the belt on the roll and the belt is V-shaped. This increases the accuracy of cutting the side of the belt into a V shape.
[0020]
(3) According to the V-shaped cutting device for the low edge V-belt according to claim 3 , since the reciprocating mechanism is a combination of a follower and a cam, the cutter of the belt processing unit and the belt running The stroke for contacting and separating the belt running on the roll of the part is accurate and reliable, and the accuracy of the V-shaped cut on the side surface of the belt can be further promoted.
[0021]
【Example】
Hereinafter, an embodiment embodying a V-shaped cutting device for a low edge V belt according to the present invention will be described with reference to the drawings. A side view showing an outline of the configuration of the present apparatus is shown in FIG. 1, and a front view is shown in FIG.
[0022]
The belt X having a square cross section before being processed into a low edge V belt by this apparatus is generally manufactured as follows. First, rubber, polyurethane or the like is reverse molded into a cylindrical sleeve shape and vulcanized. After that, this cylindrical sleeve-shaped belt is cut at the maximum width of the V-belt for manufacturing, and the belt X having a square or rectangular cross section is formed. The belt X having such a square cross section is processed into a low edge V belt X ′ (see FIG. 4) by this apparatus.
[0023]
This apparatus includes a belt traveling unit 1 including a contact roll 6, a tension roll 7, a guide roll 8 and the like, a belt processing unit 2 including a milling cutter 5 and a motor 11, and a reciprocating movement including a cam 9, a follower 10 and the like. The mechanism 3 is configured. Each part will be described below.
[0024]
(1) Belt running portion As shown in FIGS. 1 and 2, the belt running portion 1 is provided with a contact roll 6 and a tension roll 7, and further provided with two guide rolls 8 therebetween. The tension roll 7 was provided so as to be movable to the left and right of the drawing. Therefore, when the belt X is attached to the belt traveling unit 1, the tension roll 7 is first moved to the left (indicated by the phantom line in FIG. 1), and the belt X is bridged between the contact roll 6 and the tension roll 8. Thereafter, the tension roll 7 is moved to the right, and a predetermined tension is applied to the belt X. At this time, the position of the belt X on the contact roll 6 can be determined by fitting the belt X into the concave groove 13 (see FIG. 2) provided on the roll surface of the guide roll 8. In this state, the attached belt X can be run by rotating the contact roll 6 with a motor (not shown).
[0025]
(2) Belt processing portion As shown in FIGS. 1 and 2, the belt processing portion 2 has a pair of milling cutters 5 provided in parallel on the same axis, and a belt 12 is bridged between the shaft and the motor 11. By transmitting the rotation to the milling cutter 5, the milling cutter 5 is rotatably arranged.
[0026]
As shown in FIG. 3, the milling cutter 5 provided in the belt processing portion 2 has a disk shape whose cross section is V-shaped at the end thereof (see (b)), and has an outer periphery for attaching a plurality of cutting edge plates 14. A concave portion 16 and a convex portion 15 are repeatedly formed in the portion (see (a)). The cutting edge plate 14 is joined in the rotational direction of the milling cutter 5 in the side wall of the convex portion 15. The blade edge plate 14 is a triangular flat plate whose apex angle is close to the V-shaped angle of the cross section of the milling cutter 5, the apex angle is directed to the disk-shaped outer peripheral portion, parallel to the radial direction, and the milling cutter 5. Are joined so as to have a predetermined angle B with respect to a plane perpendicular to the tangential direction of the rotation trajectory and passing through the rotation axis (see (c)). For this reason, one side of the triangular cutting edge plate 14 forms the cutting edge 18. Further, as derived from the above-described configuration, the right rake angle A is negative (see (a)) and the true rake angle B is positive. Now, the milling cutter 5 shown in FIG. 3 has 12 blades, a milling diameter of about 90 mm, a cutting edge 18 length of about 15 mm, a right-angle rake angle A of about −5 °, and a true rake angle B of about 40. The thickness of the blade edge plate 14 is about 2 mm, and the apex angle of the triangle formed by the blade edge plate 14 is about 38 °. Note that the blade tip 18 and thus the life of the milling cutter 5 can be extended by applying diamond coating, titanium coating, or the like to the blade tip plate 14.
[0027]
Further, since the milling cutter 5 is pressed against the belt X on the contact roll 6 in a state where the rotation axis of the milling cutter 5 and the rotation axis of the contact roll 6 are parallel, the cutting edge 18 is formed by the rotation of the milling cutter 5. The conical inclination angle C (see FIG. 3B) is the inclination angle of the V-shaped side surface of the low edge V-belt. Therefore, an arbitrary V-shaped low edge V-belt can be manufactured by changing the inclination angle C of the blade edge 18. The pair of milling cutters 5 are fixed coaxially so that the distance between the tips of the cutting edges 18 is the same as the length of the bottom side of the trapezoidal cross section of the low edge V-belt and the side surfaces of the milling cutters 5 with the cutting edges 18 face each other. With the above configuration, the space between the pair of milling cutters 5 becomes equal to the cross-sectional shape of the low edge V belt. On the other hand, the belt processing unit 2 is disposed at a position where a plane passing through the center line of the belt X and a symmetry plane of the pair of milling cutters 5 coincide with each other, and the rotation axis of the milling cutter 5 and the rotation axis of the contact roll 6 are Always match.
[0028]
(3) Reciprocating mechanism As shown in FIGS. 1 and 2, the belt processing unit 2 is moved closer to the belt X attached to the belt traveling unit 1 (meaning movement in the right direction in FIG. 1). The state after the movement is indicated by a virtual line) and the function of separating (meaning the movement in the left direction in FIG. 1) is achieved by combining the follower 10 and the cam 9 connected to the belt processing unit 2. doing. In other words, by rotating the eccentric cam 9 about the rotation shaft 9a, the belt machining unit 2 can be reciprocated with a stroke twice the eccentric distance. The control of the position of the belt processing portion 2 by the cam 9 is more accurate than the control by, for example, a hydraulic cylinder, and this apparatus can maintain a clearance of 0.03 mm with respect to the surface of the contact roll 6. In the prior art, in order to prevent damage to the cutting edge 18 of the milling cutter 5, it is necessary to cover the surface of the contact roll 6 with a urethane sleeve or the like, and the V-shaped cutting produces a shallow reject. It was necessary to grind to V shape. On the other hand, in this apparatus, such an adverse effect, that is, the addition of a urethane sleeve or the like is not necessary. Such a reciprocating mechanism is not limited to the above-described embodiment, and a cam 9 is provided in the belt processing unit 2, and the belt processing unit 2 is fixed and a cam or a follower is connected to the belt traveling unit 1. Thus, a reciprocating motion can be given to the belt traveling unit 1.
[0029]
(4) V-cut procedure As described above, the contact roll 6 and the tension roll 7 are moved with the tension roll 7 of the belt running unit 1 shown in FIG. Put belt X in between. Thereafter, the position of the belt X is adjusted while moving the tension roll 7 in the right direction on the paper surface, and the belt X is fitted into the concave groove 13 provided on the surface of the guide roll 8. Thereby, a predetermined tension can be applied to the belt X, and the position on the contact roll 6 can be determined. Next, while rotating the milling cutter 5 of the belt processing unit 2, the eccentric cam 9 of the reciprocating movement mechanism 3 is rotated, and the follower 10 connected to the belt processing unit 2 is moved in the right direction of the drawing, thereby making contact The belt processing unit 2 is brought close to the belt X running on the roll 6. Then, as shown in FIG. 4, the milling cutter 5 is pressed against the belt X traveling on the contact roll 6 so as to be sandwiched between the pair of milling cutters 5, and the side surface of the belt X is cut into a V shape.
[0030]
【The invention's effect】
As is apparent from the above description, the low-edge V-belt V-shaped cutting device according to the present invention has the following effects.
[0031]
(1) Since the right-angle rake angle of the milling cutter equipped in the V-shaped cutting device of the present invention is negative, cutting is performed by sequentially contacting the cutting target belt from the root of the blade tip to the tip. Cutting is similar to drawing. For this reason, when cutting an elastic body such as rubber, the cutting resistance is smaller than when the right angle rake angle is positive, and there is no adverse effect that the belt escapes and the V shape is distorted or burrs occur at the cutting end. On the other hand, since the true rake angle is positive, the cutting edge can be sharp and the cutting surface can be smoothed. For this reason, it is possible to produce a high-quality low-edge V-belt having an accurate V-shaped cross section and a smooth surface. Such a high-quality low-edge V-belt effectively exhibits a wedge effect that transmits a pushing force in the lateral direction by an oblique slope, so that high transmission is possible.
[0032]
(2) Further, according to the V-shaped cutting device for the low-edge V-belt of the present invention, since the pair of milling cutters are coaxially fixed in parallel, the space between the pair of milling cutters is the V-belt. If the interval is adjusted so that it has the same shape as the cross section of the above, it is easy to press the running belt and the pair of milling cutters so that the belt is sandwiched between the pair of milling cutters. And the side of the belt can be accurately cut into a V shape. Further, it is possible to avoid the difficulty of adjusting the V-shaped inclination as in the device described in the prior art (B). Further, when the belt is traveling on the roll, the two milling cutters and the roll are pressed against each other so as to sandwich the belt, so that the belt can be prevented from escaping. This makes it possible to produce a high-quality low-edge V-belt and improve the yield of products that meet the standards.
[0033]
(3) According to the low-edge V-belt V-shaped cutting device of the second aspect, the position of the belt on the roll can be accurately determined by the guide roll provided in the belt running portion. As a result, the relative position between the belt processing portion and the belt traveling on the roll can be accurately determined, and the accuracy of cutting the side surface of the belt into a V shape is increased. Therefore, it is possible to further contribute to the same effect as described in the above (1), that is, higher quality such that the V-shaped cross-sectional shape of the low edge V belt is uniform and accurate.
[0034]
(4) According to the low-edge V-belt V-shaped cutting device of the third aspect, in the reciprocating mechanism, the milling cutter of the belt processing unit and the roll of the belt running unit are combined by a combination of a follower and a cam. Since the stroke that presses and separates the belt running on the belt is performed, the positioning of the stroke is reliable, the cutting edge of the milling cutter touches the roll surface and is damaged, and there is a difference in the range of cutting to V shape Can be prevented. For this reason as well, it is possible to improve the quality of the low-edge V-belt as in the above-described effect.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a V-shaped cutting device for a low edge V belt according to an embodiment of the present invention.
2 is a plan view showing a schematic configuration of a V-shaped cutting device for the low edge V-belt of FIG. 1; FIG.
3 shows a milling cutter equipped in the V-shaped cutting device for the low-edge V-belt of FIG. 1, FIG. 3 (a) is a side view, FIG. 3 (b) is a front view, and FIG. 3 (c) is a plan view. FIG.
4 is an explanatory diagram showing a portion for cutting a belt by a V-shaped cutting device for a low edge V belt in FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt running part 2 Belt processing part 3 Reciprocating movement mechanism X Belt X 'Low edge V belt 5 Milling cutter 6 Contact roll 7 Tension roll 8 Guide roll 9 Cam 9a Rotating shaft 10 Follower 11 Motor 12 Belt 13 Groove 14 Cutting edge plate 15 Convex Part 16 Concave part 18 Cutting edge

Claims (3)

A belt traveling unit that circulates the belt over a roll, a belt processing unit that is equipped with a cutter and cuts the side surface of the belt into a V shape, and a cutter of the belt processing unit and the belt of the belt traveling unit are brought into contact with each other. Therefore, in the V-shaped cut device of the low edge V-belt in which a reciprocating mechanism capable of providing a relative feed is provided between the belt processing unit and the belt traveling unit,
The cutter of the belt processing part is a milling cutter in which the true rake angle is plus and the right angle rake angle is minus ,
The belt processing section is configured so that the two inclined milling cutters having the cone inclined angle formed by the cutting edge coincide with the inclination angle that cuts the side surface of the belt into a V shape are coaxially arranged so that the blade edges face each other. Provided in parallel so that the milling cutter of the belt processing unit and the belt of the belt traveling unit are in contact with each other on the roll of the belt traveling unit.
A V-shaped cutting device for low edge V belts. The V-shaped cut device for a low-edge V-belt according to claim 1, wherein a guide roll for determining a position of a belt traveling on the roll is provided in the belt traveling section . 3. The V-cut device for a low-edge V-belt according to claim 1, wherein the reciprocating mechanism has a structure in which a cam and a follower are combined .

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