JPS62199319A - Manufacture of v ribbed belt - Google Patents

Abstract

PURPOSE:To enable the manufacture of a quality V ribbed belt having high precision forming and a low coefficient of friction by cutting to form multi- striped V shaped grooves at a time with the use of a rotating grinder having, in an integrated form, a milling edge at the tip and a grinding abrasive grained face on the side. CONSTITUTION:When multi-striped V shaped grooves 2, 2 are formed on the outer perimeter of a cylindrical elementary form 1 for forming a V ribbed belt made of elastomer with the method previously known, a rotating grinder 5 having, in an integrated form, a milling edge 3 for cutting the bottoms of V grooves 2 at the tip of a radial blade and a grinding abrasive grained face 4 for the side of V grooves on the side is used. Thus, the bottom top part of the V grooves 2 is cut with the milling edge 3 and formed in a sharp form and also the side is ground with a remarkably small amount of friction as the part previously cut and opened is ground. In either case, heating is low and the occurrence of formative error is few. The blade-edge of this rotating grinder 5 can also be so arranged that the milling edges 3 at the tip and the grinding abrasive grained faces on the side are alternately placed, thus making possible the manufacture of the quality V ribbed belt.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for manufacturing a ribbed belt,
This invention relates to an improvement in a method of manufacturing a V-ribbed belt by cutting out and forming grooves.

[Conventional technology]

Conventionally, when manufacturing a V-ribbed belt with a plurality of grooves parallel to each other on the inner peripheral surface of the belt, a large number of grooves are cut and formed in parallel on the outer surface of a cylindrical mold made of elastomer material, and then A processed cylindrical blank is cut into a ring shape with a predetermined center line, and the cut is inverted to form a product.

In this cutting process, conventionally, the rough shape of the groove is first formed using a rough finishing grinder, and then the bottom and side surfaces of the groove are finished using a finishing grinder.

The reason why grooves are shaped using this two-step process is that when forming grooves using only a finish grinder, grinding takes time due to the fineness of the abrasive grains, and the heat generated during this process melts the elastomer material. This causes clogging, and on the other hand, it is impossible to precisely finish the V-groove using only a rough-finishing grinder, and in particular, the shape of the top of the V-groove with a small radius of curvature cannot be finished, which is a problem in terms of the functionality of the V-ribbed belt. This is because

(Problems with conventional technology) However, even if the cutting is divided into two stages, each cutting process generates some amount of heat, which causes thermal expansion of the grinding machine and the material to be cut, and these factors synergize. This causes finishing dimensional errors such as rib pitch misalignment and rib crest misalignment, and the grinding machine is also subject to heavy wear, so it must be replaced relatively frequently, and when this replacement occurs, shape errors with the previously used grinding machine may occur. There was a problem in that manufacturing management was extremely troublesome as adjustments were needed to take this into account.

In particular, when a flexible elastomer is used in the belt compression section, the above-mentioned drawbacks become noticeable.

[Problems solved by the invention]

In view of the above-mentioned problems, this invention eliminates the hassle of cutting in a two-step process, allows manufacturing of ribbed belts in only one cutting process, and eliminates most of the heat generation during cutting and molding errors caused by this. The purpose of this invention is to provide a method for manufacturing a V-ribbed belt that does not require the following steps.

[Technology to solve problems]

That is, in the method for manufacturing a V-ribbed belt of the present invention, in cutting and forming a multi-striped groove on the surface of a V-ribbed belt forming mold formed into a cylindrical shape from an elastomer material, a milling blade is used as a cutting blade at the bottom of the groove; Further, the present invention is characterized in that (1) multiple grooves are simultaneously cut and formed using a rotary grinder having an integral abrasive grinding surface for grinding groove side surfaces.

〔Example〕

Next, the present invention will be explained with reference to examples.

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is a side view of a rotary grinding machine used to carry out the method of the present invention.

In the method for manufacturing a V-ribbed belt of the present invention, as shown in FIG. 1, in cutting and forming multiple grooves 2 on the outer periphery of a cylindrical mold 1 for molding a V-ribbed belt made of an elastomer material, As shown in FIG. 2, a rotary grinding machine 5 having a milling cutter 3 as a blade for cutting out the shape of the bottom of the V-groove 2 and an abrasive grain grinding surface 4 for grinding the side surface of the V-groove is used to simultaneously cut multiple V-grooves. n2...2 is formed by cutting (configuration).

In addition, when the rotary grinder 5 is applied to the cylindrical outer circumference V4
2... Since the method of cutting 2 is the same as the conventional grinding method, detailed explanation will be omitted.

In the above embodiment, the shape of the rotary grinder 5 is such that the milling blades 3 are integrally provided on the outer edge of a radial blade body provided with an abrasive grinding surface for grinding on the V-groove side surface. Instead, as shown in FIG. 3, there is a rotary grinding machine 5 formed by alternately radially arranging blades 4 whose side surface is a grinding abrasive surface and blades whose tip is a milling blade 3. may also be used.

Which of the rotary grinding machines 5 to use is selected depending on the degree of hardness or softness of the material of the V-ribbed belt to be formed, the type of reinforcing fibers mixed in, the depth and width of the V-groove to be formed, etc. be done.

Further, it is desirable that the distance between the radial outer circumferential edge 4'' of the grinding abrasive grain surface 4 and the envelope outer circumferential edge 3'' formed by the tip edge of the milling blade is approximately 0.31 or less.

The reason for this is as shown in FIG.
The shape of the grooves 2...2 is such that when meshing with the pulley 7, the V-groove 2 is made deeper with respect to the peak part 7A of the boob to improve transmission efficiency, and the created gap H produces a wedge effect. This is because this gap is usually approximately 0.31 or less.

[Operation] When cutting and forming the V grooves 2...2 of the V-ribbed belt according to the present invention, if the rotating rotary grinder 5 is applied to the cylindrical outer mold 1, the grooves are first cut with the milling blades 3...3. begins to be cut out, and then the V-groove side surface is cut open by the grinding abrasive grain surface 4, and cutting is completed when the rotary grinder 5 cuts to a predetermined depth.

At this time, the bottom and top portions of the grooves 2 . At the same time, when forming the groove side surface by grinding, the part cut out in advance by the milling cutter 3 is widened by grinding, so the amount of friction is significantly reduced compared to forming the groove from the beginning by grinding. , heat generation due to grinding is also reduced.

Therefore, the overall amount of heat generated during grinding is extremely small, and the occurrence of shape errors due to heat is reduced.

By the way, when we compared the amount of heat generated when V-grooves 2...2 were cut out using the method of the present invention with that of the conventional two-step grinding method, we obtained the results shown in Figure 7, which proves that the method of the present invention is superior. found.

Furthermore, according to the present invention, the V-groove can be formed with good precision due to the low heat generation temperature during groove forming, and the radius of curvature r of the groove tops of 1112...2 can be adjusted precisely as shown in FIG. As a result, it was found that the belt transmission capacity, as shown in FIG. 7, and the friction coefficient of the belt, as shown in FIG. 8, were also improved.

The heald transmission capacity shown in FIG. 7 is based on the case where pulleys each having a diameter of 100φ11 are used as the driving pulley and the driven pulley, a dead load of 45 kgf is applied to the driven pulley, and the driven pulley is rotated at 3500 rpm.

Furthermore, the coefficient of friction of the belt shown in FIG. 8 is as shown in FIG.
Hang it on the drive pulley P of @, hang it vertically downward, attach a 1.75 kg weight W to the hanging end,
The friction coefficient detected by the load cell during rotation at 3 rpm was measured.

〔effect〕

As explained above, when cutting and forming multiple V grooves, this invention finishes forming the groove bottom with a milling blade and the groove sides with a grinding surface at the same time, so forming the V4 can be done in just one grinding process. In addition to reducing the number of molding steps, since the amount of heat generated is small, molding errors due to heat will not occur, and molding accuracy can be improved despite the small number of steps, resulting in improvements in transmission capacity and friction coefficient. It is possible to produce high-quality V-ribbed belts at low cost.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention, FIG. 2 is a side view of a rotary grinding machine used for carrying out the method of the present invention, FIG. 3 is a side view of another rotary grinding machine, and FIG. 4 is a side view of another rotary grinding machine. ■A cross-sectional view showing the meshing state between the ribbed belt and the pulley; FIG. 5 is a graph showing data on the grinding state by the method of the present invention; FIG. 7 and 8 are graphs showing the performance of the ribbed belt obtained by the method of the present invention, and FIG. 9 is an explanatory diagram of the test equipment used to obtain the data shown in FIG. 4ゞFIA am'': ?W*N咋1 γ/IJfJ γ21 ,'knee 噸t 3m 7A (7°-99shidoor 75m / 2 3 4 5 15 (ω→Rjf
・7 H4 lap 6WJ γ7fl O, / 0. ;> σ, 36・46.5 t), 6
θ, 72〉 Riff Groove 7 #Shoji mki 1 γ1 Flea Aro 1
fB ==>;Sl encounter skin

Claims (4)

[Claims] (1) When cutting and forming multiple V grooves on the surface of the mold for forming a V-ribbed belt formed into a cylindrical shape from an elastomer material, a milling blade is used as a cutting blade for the bottom of the V groove, and a grinder is used for grinding the sides of the V groove. A method for manufacturing a V-ribbed belt, characterized by cutting and forming multiple V-grooves at one time using a rotary grinder having an integral grain-grinding surface. (2) The method for manufacturing a V-ribbed belt according to claim 1, which uses a rotary grinder having a radial blade whose side surface is an abrasive grain surface and whose tip is a milling blade. (3) The V-ribbed belt according to claim 1, which uses a rotary grinder in which blades whose side surfaces are abrasive grain surfaces and blades whose tips are milling blades are alternately arranged radially. manufacturing method. (4) The distance between the envelope edge of the radial outer circumferential edge of the grinding abrasive grain surface and the envelope outer circumferential edge formed by the tip edge of the milling blade is 0.3 mm.
A method for manufacturing a V-ribbed belt according to claim 1, 2, or 3 below.