JPS58102659A - Grinding method of endless transmission belt and its apparatus - Google Patents

Abstract

PURPOSE:To prevent the side face tensile member from becoming rugged improve accuracy of belt angle, and increase smoothness of the side face in such a way that frictional sliding sides of a V-belt is polished with a high speed rotary grinding stone. CONSTITUTION:A belt 9 to be polished is attached to a holder 12, and a grinding stone 18 is set to orthogonally cross the belt 9. A handle 30 is turned, a nut 25 on a screw rod 24 is slid on the rod 24, and the grinding stone 18 which is operationally joined with the nut 25 is moved, so that the grinding stone can be positioned. Grinding angle of the grinding stone 18 to the belt 9 is determined in response to selected angles of a pointer 28 and an angle plate 29 with a fixing means 27, and the endless transmission belt is ground by rotationally driving the holder 12 and the grinding stone 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endless power transmission belt, specifically, a low-speed transmission belt.
The present invention relates to a belt polishing method and apparatus.

Low edge tie-fV belts (endless power transmission belts) are usually molded and vulcanized as a cylindrical belt, then cut into rings, and polished on the sides to produce the final belt product.

During round cutting, the belt cylindrical body is cut into dimensions close to those of the final belt product, but the V-shaped angle of the belt and the roughness and irregularities of the exposed tensile material on the cut surface become uneven. Is it unavoidable? It is finished into a product after undergoing post-grinding M1f. Although this polishing process has been carried out in the past, it is very difficult to make the smoothness and friction coefficient of the transmission side surface of the belt constant over the entire belt.

Therefore, in the present invention, the frictional sliding 111 of the V-belt
By polishing m with a high-speed rotating grindstone, it is possible to prevent paralysis of the side tension members, improve the accuracy of the belt angle on the sides, and increase the smoothness of the sides. In the case of a belt made by mixing short fibers, a method for polishing an endless power transmission belt that can make the fiber length of the short fibers exposed on the side surface of the belt uniform in each part of the side surface and constant the coefficient of friction a in each part. We are also trying to provide equipment.

According to the first aspect of the present invention, when the side surface of the endless power transmission belt is polished with a rotating grindstone, the grain size is #60 to $20.
Using a grindstone in the range of , the grindstone is arranged so that the belt (K) is approximately perpendicular to the grindstone, and the surface to be polished of the belt and the grindstone are in line contact.
and the speed ratio V9/ of the speed V of the polished surface of the belt and the circumferential speed vI of the polished surface of the grindstone is 0.002 to 0.2.
The above object can be achieved by performing polishing by rotating the belt and the grindstone so that they move in opposite directions at the one point of contact within the range of .

According to a second aspect of the present invention, there is provided a holder that positions and holds an endless transmission belt in a circular manner and is rotationally driven, and a holder that is configured to polish the polished side surface of the circular belt held by the holder. at least one rotary grindstone arranged substantially perpendicularly and operatively connected to a rotary drive means; means for adjusting the polishing angle of the rotary grindstone with the drive means with respect to the belt polishing WJK; and a belt to be polished. The above object can be achieved by configuring a belt polishing device with a grindstone positioning means for moving the grindstone in the radial direction of the belt according to the diameter of the belt.

Hereinafter, the method and apparatus for polishing an endless power transmission belt according to the present invention will be described in detail with reference to a preferred embodiment shown in the attached FIG. 1iiK.

Figure 1 shows a cross section of the low edge type V belt (endless power transmission belt) to be manufactured, where 1 is the upper fabric, 2 is the tension part, 3 is the cushion part, 4 is the tensile body, 5 is the compression part, 6 is the lower cloth, and 7 is the polished side surface.

In the tension section 2 and the compression section 3, short fibers may be mixed in roundings for reinforcing the rigidity in the transverse direction of the belt. The tensile member 4 is exposed on the surface of the polished side surface 7. In some cases, the lower cloth 6 may not be applied.

Figure 11g2 is an explanatory diagram of belt polishing, 8 is a grindstone,
7 is the surface of the belt 9 to be polished. The grindstone 8 rotates at vl in the direction of the hour hand in the drawing, and the belt 9 is rotated and transferred to the right in the drawing, and both of them are at point P at 11i! contact,
They are rotating in opposite directions at the contact point P.

The grain size of the grindstone used is in the range of s#60 to #20.

If it deviates from this range, a belt polishing surface that is not suitable for the intended purpose will be obtained.

Further, the rotational speed V of the grindstone is set to 500 to 2500 m/-, and the speed V of the polished surface of the belt is extremely small compared to vl, that is, the speed ratio vt/v of both is 0.002.
-0.2. The reason for doing this is that when using a grindstone with a grain size in the above range, it is most effective to keep the rotational speed of v within the above range, and the speed ratio v
When R/ is less than 0.002, the polishing efficiency decreases, and when R/ increases more than 0.2, uniform polishing becomes impossible.
This is because it is not preferable because a good surface cannot be obtained and heat generation during polishing becomes large.

As shown in the front view of FIG. 3 and the side view of FIG. A driven belt holder 12 is provided. This holder has a circular groove 13 in which the belt 9 is attached, and a fifth
As shown in the figure, hold down the belt 9 at the required locations using the presser 14.
It can be fixedly supported. Further, the holder can be attached to and detached from the transmission shaft 11, and the holder is selected and used according to the diameter of the belt to be polished. In Fig. 4, the holder for storing a large-diameter belt is shown in solid lines, and the holder for storing a small-diameter belt is partially shown in chain lines. Sliding piece 16 from the back side?
It is of a type that stops at 17, but any type may be used. The groove "3" of the holder 12 is the sixth
As shown in a partially enlarged view in the figure, the polishing PJJ surface 7 of the belt is formed to be inclined with an angle that is half of the r angle α.

A grinding wheel 18 is disposed substantially perpendicular to the belt 9 so as to be in line contact with the side surface 7 to be polished of the belt 9 mounted in the groove 13 of the holder 12 as described with reference to FIG. 2, and is shown enlarged in FIG. 6. The polishing surface of the grindstone 18 is inclined at a 40 angle like the groove 13 of the holder 12 for polishing. Although two grindstones 18 are provided facing each other in the 31st gJ, at least one may be provided, one of which may be a rotatable roller, or two or more grindstones may be provided.

Grinding wheel 18 is attached to air motor 190 rotor shaft 20, and motor 19 is connected via hose 21 to a source of pressurized air (not shown). The motor 19 has a rotatable shaft 22
This shaft 22 is pivoted by an IA member 23, which is attached to a mounting bracket 26 secured to a nut 25 on a threaded rod 24 which is carried in a suitable bearing. The member 23 is provided with means 27 for fixing the rotating shaft 22 and a pointer 28 indicating the rotation angle of the grindstone.
Corresponding to the pointer 28, the rotating shaft 22 has an angle [1] indicating the rotation angle.
129 is attached to it. The threaded rod 24 is threaded in opposite directions at corresponding portions so that the grindstones 18 disposed opposite to each other can be moved toward or away from each other. By rotating both grindstones 18, both grindstones 18 can be adapted to the belt diameter. To change the polishing angle of the grindstone 18 with respect to the belt (see Fig. 6), loosen the fixing means 27, rotate the rotating shaft 22 while watching the angle plate 29 and pointer 28, and then rotate it again by the fixing means 27 at the desired angle. Fix the shaft 22.

Next, the n! i & [A brief explanation.

First, attach the polishing belt 18 to the hole/-12, and
The position of the grindstone 18 is determined so as to be orthogonal to the grindstone 18. This rotates the handle 30 and tightens the nut 25 on the threaded rod 24.
This is done by sliding the grinding wheel 18 on the keyaki 24 and moving the grinding wheel 18 which is operatively connected to the nut. After positioning the grindstone 18, the pointer 28 and angle plate 29 are fixed by the fixing means 27.
Depending on the selected angle of the grinding wheel (bell) K, the inclination (polishing)
Determine the angle. Since preparation for polishing is now complete, the belt is polished by rotating the holder 12 and the grindstone 18 by their respective driving means so as to satisfy the various conditions as specifically explained with reference to FIG. This makes it possible to produce an excellent belt that meets the intended purpose as stated at the beginning of the specification.

7 and 8 show other polishing methods.

In the example of FIG. 7, the tension/f-
A belt 9 to be polished is stretched between the belts 931, and a V-shaped grindstone 32 is disposed in the middle for polishing. No'731 K applies tension F, and belt 94C has lθ~200t on the polished surface.
The rotation speed of the grindstone is V3, and the feed speed of the belt is V!, except that the tension (as F/2) is applied. , the grain size of the grindstone, etc. operate in the same manner as previously explained. @7b As shown in the cross section in figure 7b, the belt 9 is attached to the V-groove 33 of the V-shaped grindstone 32.
Inside, both polished sides are polished at the same time.

The example shown in Figure 8 is almost the same as that shown in Figure 7, but
The example in Fig. 7 is that the belt 9 is reversed and becomes f-1J31.
The only difference is that the V-shaped grinding wheel 32 is accordingly arranged on the opposite side of the belt from FIG. Even with such a configuration, a V-belt with excellent characteristics can be manufactured by polishing under the roughness described with reference to FIG.

As is clear from the above description, the present invention also provides many advantages as described below.

11) The vI1 surface of the V-belt has cloth and tensile material exposed on the surface, and is used by engaging with the V-diameter. One of the reasons why belt performance and durability are impaired during use is
Belt dimensions, particularly width and angular accuracy, may vary within a single belt. According to the present invention, the side-exposed tensile material and the fabric can be popped out and peeled off. The angular accuracy can be increased by one belt width without causing problems.

12) In the present invention, the grindstone and the belt polishing surface are in line contact, vl >> Vt, v and V,
Due to the three factors that the directions of are opposite to each other, the side-exposed tensile members become extremely short fibers and scatter at the contact portion with the grindstone during polishing. Since the tensile body is only cut short at the part where it comes in contact with the grindstone, the effect on the inside of the tensile body is very small. As a result, the polished surface of the belt can be polished smoothly and with excellent performance.

3) When short fibers are mixed in the compressed and tensioned parts of the belt, an appropriate and uniform coefficient of friction can be imparted to the side surfaces of the belt by adjusting the grain size of the grindstone used.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the belt to be manufactured, Fig. 2 is a front view (a) and side view (b) for explaining the method of the present invention, and Figs. 3 and 4 are respectively of the polishing apparatus of the present invention. Front view and side view, Fig. 5 is a partial front view showing the method of fixing to a belt holder, Fig. 64 is a partial TFR side view 1 showing the arrangement of the holder and grindstone during polishing, Figs. 714 and 8 FIG. 3 is a plan view showing another belt polishing method. Code 1: Upper cloth, 2: Tension portion, 3: Cushion portion, 4: Tensile member, 5: Compression portion, 6: Lower cloth, 7
... Polishing side surface, 8 ... Grindstone, 9 ... Belt, 10
... Fixed base, 11... Transmission wheel, 12... Holder, 13... Groove, 14... Holder, 15... Long hole,
16... Piece, 17... Zelto nut, 18...
Grindstone, 19... Air motor, 20... Rotor shaft, 2
1... Hose, 22... Shaft, 23... Member, 24
... Threaded rod, 25... Nut, 26... Placket, 27... Fixing means, 28... Pointer, 29...
Angle plate, 30... No angler, 31... Tension pulley, 32... V-shaped grindstone, 33-Vile Patent applicant Yokohama Im Co., Ltd. Makoto 3 Figure vi J4 Zuka 6 Figure 2

Claims (1)

[Scope of Claims] -1) When polishing the side surface of the endless power transmission belt with a rotating grindstone, a grindstone with a grain size in the range of #60 to #20 is used, and the grindstone is arranged so as to be substantially perpendicular to the belt. The surface to be polished and the grinding wheel are brought into line contact, and the pre-polishing speed v1 of the grinding wheel is in the range of 500 to 2500 m/wig, and the speed of the surface to be polished V of the belt and the circumferential speed V of the polishing surface of the grinding wheel are Polishing of an endless power transmission belt, characterized in that the polishing is carried out by rotating the belt and the grindstone so that they move in opposite directions at the contact point at a speed ratio V2/vI of 0.002-=0.2J). Method. 2) A holder which is rotatably driven while holding the endless transmission belt in a circular position, and a holder which is arranged substantially perpendicular to the polished side surface so as to polish the polished side surface of the circular belt held by the holder. , at least one rotary grindstone operatively connected to a rotary drive means, means for adjusting the polishing angle of the rotary whetstone with the drive means relative to the belt polishing surface, and according to the diameter of the belt to be polished. A grinding device for an endless power transmission belt, comprising a grindstone positioning means for moving the grindstone in the radial direction of the belt.