JPS6046220A - Manufacture of long v-belt with cog - Google Patents

Abstract

PURPOSE:To secure formation of cog parts by a method wherein the final press curing range of a belt formed body in a sequentially forwarding process is left unvulcanized and this part is pinched between the molds having an elastic matrix to conduct a press-vulcanization provided with cog forming. CONSTITUTION:Press vulcanization is conducted by a sequentially forwarding process. In a final press-vulcanization, an elastic matrix mold having expansibility is adopted for a matrix mold having cogs to be vulcanized. In forming cogs on a belt the elastic matrix mold is expanded and contracted according to the length of the range to form the final belt cogs that is left unvulcanized and in a long belt also the precision of the cog is obtained with good excellence and the process of vulcanization is performed simply. The outside of a cylindrical drum 11 is covered with a rubber sleeve 12 and wound with unvulcanized V-cord rubber sheet 3a, 3b, 5, a rope 4, to form an unvulcanized belt formed piece 10 and then to be taken out of the drum 11. This formed piece 10 is moved in succession, pinched between the molds and vulcanized and the unvulcanized range belt of the formed piece 10 is vulcanized finally.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a long row edge cog-equipped belt.

Conventional methods for manufacturing this type of belt include, for example, the drum method, in which a rubber cog-equipped matrix is wrapped around the surface of the drum, and the belt components, including a V-core rubber sheet, are sequentially wrapped around it to form an unvulcanized belt. The method used was to mold a body, fit a cylindrical jacket onto its surface, and then vulcanize it in a vulcanization can. However, it is rare that the length of the folded belt, which involves cutting an open cog-equipped matrix into a predetermined length and winding it endlessly around the drum surface, can always be accurately divided by the cog pitch. Even if there is no particular quality problem with the shape of the cog of the belt at the joint, I have often experienced the occurrence of cog pinch displacement.

In addition, the use of low-edge V-belts for general industrial use has recently been considered, and the demand for long, narrow-edge cogged V-belts with good flexibility is increasing. Therefore, as an alternative to this, there is a press that progressively vulcanizes the unvulcanized belt molded body using a flat cog-equipped mold. Vulcanization molding method is used.

Progressive vulcanization in the press vulcanization method is performed at both ends of the press to prevent air bubbles from forming, volume overflow, and rubber leakage from the belt molded body.
The vulcanization boundary area of the molded body is brought to a semi-vulcanized state using a cooling device, and the second press vulcanization process is carried out after the progressive feeding operation following the first press vulcanization.
After the vulcanized cog part tv) molding part and the unvulcanized belt molding part need to be vulcanized in the same press, partially overlappingly.

The cog portion of this folding master mold is fitted into the cog portion located at the end of the already vulcanized belt. In general, the belt length is not necessarily divisible by the cog pitch of the mold, and continuous molding of the cog parts of the initial vulcanization zone and final vulcanization zone of an endless belt molded body is Most of the time we look at the occurrence of fractions of cogs. When this unvulcanized endless belt molded product with cog fractions is vulcanized using a mold with cogs, during final vulcanization, the cog part of the bezel does not match the cog part of the mold, so the molding is intentionally vulcanized. There remained problems that needed to be resolved, such as the cog portion of the belt being destroyed due to forced sulfurization. One way to eliminate this problem is to remove the unvulcanized endless belt, which is molded integrally with the matrix on the drum, together with the matrix, even if some fraction occurs, and vulcanize it in a separate press vulcanizer in a progressive manner. There is also a method of removing the matrix after sulfurization. In this case, the situation where the belt cog part is destroyed can be solved, but extra work is required to remove the mother molds one by one, and the heat and pressure during vulcanization make it impossible to reuse the mother molds, resulting in waste. As a result, new economic problems have arisen, such as the increased cost of belts.

This invention aims to eliminate and improve the drawbacks inherent in the above-mentioned various types of vulcanization methods.Basically, while the press vulcanization method using the progressive method is the mainstream, the final press vulcanization When the belt cog pitch part that has already been vulcanized and sent is aligned with one end of the cog pitch of the mother mold, the notch (belt cog pitch part that was vulcanized before the final press vulcanization) is aligned with the other end of the belt cog pitch. In most cases, the pitch (belt cog pitch part that is press-cured first) does not fit accurately to the cog pitch of the mother mold, but if press-curing is performed forcefully as it is, the belt cog part Concerned that the cogs would be destroyed, an elastic matrix mold with elasticity was used as the cog-equipped matrix mold for the final press vulcanization, and by vulcanizing with this, the uncured parts were removed during belt cog forming. An elastic matrix mold is used to expand and contract according to the length of the final belt cog forming area left in the sulfuric state, resulting in fairly good cog accuracy even on long belts and simplifying the vulcanization work. I was able to achieve this.

Hereinafter, a specific example of a method for manufacturing a V-vet with a long row edge cog, which is characterized in that a stretchable elastic matrix mold is used only during the press vulcanization work accompanying the final cog forming, will be described with reference to the drawings. I will explain how to use it.

First, the first step is to form a cylindrical drum (Ill) whose surface is coated with rubber Nureve (12), and on the outer circumferential surface of which is coated an unvulcanized V-core rubber sheet with a constant thickness and in which short fiber groups (2) are oriented.
) +11 and said short edge #&+21 is a cylindrical drum (11
Wrap it endlessly at right angles to the circumferential direction of 1.
Next, the lower cushion rubber sheet (3a) is wrapped with the tensile rope (4) under constant tension in a spiral shape, and then the upper cushion rubber sheet (3b) is wrapped around it.
Further, a single-core rubber sheet (5) in which the short fibers (2) are oriented perpendicularly to the circumferential direction is wrapped around the sheet, and its outer peripheral surface is covered with at least one elastic canvas (6) with rubber. Then, an endless sleeve-shaped unvulcanized belt molded body a0 whose partial perspective view is shown in FIG. 2 is formed.

Next, in the second step, as shown in FIGS. 3 and 4, the unvulcanized belt formed body Ql, which has been removed from the cylindrical drum 011, is placed between two flat plates whose center distance can be adjusted. .

- 211 (Suspended between 211, upper plate @ on the surface side of belt molded body θ0, middle plate @ on the bottom side of belt molded body 00
(e) and then the lower plate () on the downward facing surface side of the belt molded body.
are placed on each plate, and a metal mold (
251, 261, 26+, n has a mold (c) in contact with the surface side of the vl and the face is a smooth surface (support)), while a mold (28+ The above-mentioned die mold (2
5) (26+coa has raised edges (311) on both the left and right sides to prevent rubber from flowing out during vulcanization. Also, in the width direction (the edges (311) at both front and rear ends of each mold) ] 1) is equipped with a cooling device (321, more specifically, a cooling fluid supply pipe). Volume over, nubonji occurrence, pe/
l/ ) This device (2) suppresses the occurrence of outflow of the rubber constituting the molded body.

A pair of flat boos! J (2)) The belt molded body 00 suspended between f2+1 is molded with a cog surface installed in the middle (c) at two locations, on the outbound side and return side.
b) surface, the smooth surface (2
8) Die mold CI with! 5) and □ sandwich and press the belt molded body 00, and at a predetermined temperature and pressure, vulcanization progresses on the belt molded body 00 as the cog is formed, and at this time, the cog is formed and the vulcanization progresses. A cooling device (32) is used to suppress the generation of air bubbles and the phenomenon of volume overflow at the boundary between the vulcanized and unvulcanized portions of the belt molded body. The vulcanized belt molded body is sequentially fed from the vulcanization area of the metal mold, and by the action of the cooling device G21 at the rear of the vulcanized part, the belt cog part in a semi-vulcanized state is transferred to the metal mold again. After fitting into the front cog, only the semi-vulcanized part is heated and pressurized again to be vulcanized together with the next part, and this operation is repeated one after another until the final vulcanization of the belt molded body is completed. The second step is completed leaving the zone unvulcanized. (Therefore, since the vulcanization process is proceeding at the same time in the upper and lower parts of the endless belt molded body, two unvulcanized zones will remain as a result.) In the third step shown in FIG.
The process is directed to the vulcanization of the final vulcanized areas left unvulcanized in the unvulcanized belt compact. i.e.)
Ly) A metal mold (44) having a smooth surface +431 is provided on the belt clamping surface side of each of the upper plate C41) placed on the front side of the molded body 01 and the lower plate (42) placed on the bottom side.
) and protrusions (45) extending in the mold width direction at predetermined intervals.
An elastic matrix mold (equipped with 4η) that has elasticity and has a cog surface in which 1 and concave grooves (461) are arranged alternately.
The two remaining unvulcanized belt molded body portions are vulcanized at a predetermined temperature and pressure using a two-stage press vulcanizer with raised edges (not shown) on both sides for preventing rubber outflow.

The rear cog part (7a) of the final vulcanized belt vulcanized in the second step is fitted into the front cog part of the elastic matrix mold (4η), and the first vulcanized belt /L/ The leading cog part is molded into an elastic matrix mold (which fits into the rear cog part (7b) of 471, and the cog part of the belt is in a semi-vulcanized state with the cooling device 02), and the upper plate (41) is molded into the lower plate (471). The unvulcanized region of the belt molded body α0, which is represented by n plus length l+, is finally vulcanized.

In this way, the semi-vulcanized cog portion is completely vulcanized by heating and pressurizing again. Even in this invention, especially the third
In the process (see Figure 5), for most belt sizes, the length of the remaining uncured area (l) cannot be divided by the cog pitch of the matrix mold and a fraction occurs, but this matrix mold has elasticity. Since it is made of a stretched elastic body, the part of the master mold into which the remaining unvulcanized belt molding part fits can freely expand and contract, and absorb the fraction very easily.

That is, if the length of the remaining unvulcanized part 1) is short, the master mold is shrunk, and if it is long, the master mold is expanded to correspond to the length of the unvulcanized zone, and the contact part is cog-molded. Vulcanize at the same time.

The above-mentioned elastic matrix mold has a hardness of 70 to 80° (J
IS standard), 100% modulus l OOkg/cm2
Hereinafter, any material may be used as long as it satisfies the physical properties of elongation at cutting of 200φ or more, and is not necessarily limited to those made of rubber.

In the final process, the full-length molded and vulcanized body is cut into a V-shape with a constant width to form a cog (
7) Obtain a long V-belt 01' with a row edge cog in which the sections are connected.

The method for producing the belt detailed above is to press vulcanize a wide endless belt molded body with cog forming, then cut the wide nuleep-shaped molded body into rounds to create belts with multiple cogs. Although an example of manufacturing is disclosed, a wide endless belt molded body is V-cut to a predetermined width prior to vulcanization, and each independent endless belt (L/ ) molded body is formed. It is also possible to obtain a cogged VB/l/) by press vulcanizing a plurality of pieces at the same time with cog forming, and a specific example of the manufacturing method will be described below with reference to the drawings.

Note that this embodiment uses almost all of the steps disclosed in the previous embodiments, so if there are overlapping work steps, the details will be omitted and the explanation will be continued. shall be.

First, in the first step, a wide sleeve-shaped unvulcanized belt is formed by wrapping various belt constituent materials including V-core rubber sheath (11) in a laminated manner on the outer peripheral surface of the cylindrical drum a1J centered on the above-mentioned Figure 1. The molding process for the fiy l-formed body a0 is the same.At this point, in the second step, the sleeve-shaped unvulcanized belt molded body 00 is cut into rounds of a predetermined width, and then both sides of the formed body are cut using a nukiving machine. The surface is skived into an approximately inverted trapezoidal shape to form a plurality of independent endless unvulcanized V-belt molded bodies (IOA).The following third step was previously explained with reference to FIG. Basically, it is almost the same as the above, but two V-grooved pulleys (21A) (2LA) whose center distance can be adjusted as shown in Figures 7 and 8.
A plurality of unvulcanized VB/l/) molded bodies (IOA) (
IOA) is suspended at the same time, ■ Velsito molded body (LOA)
An upper plate (22A), a middle plate (23A), and a lower plate (24A) are arranged facing the front and bottom parts of Mold (25
The configuration for equipping A) (26A) (26AX27A) is the same, but the mold (25A) at this time
(27A) has a plurality of arch surfaces (28A) having smooth surfaces arranged at equal intervals in the mold width direction, each arch surface (28A) having a smooth surface.
Corresponding to A), an inverted trapezoidal groove (26A) is formed in the metal mold (26A), and the bottom of this inverted trapezoidal groove has protrusions (29A) and concave grooves (30A) at predetermined intervals. ), and a cooling device (32A) extending in the width direction of the mold, more specifically a cooling fluid supply pipe, is provided at both front and rear ends of each mold.

The endless unvulcanized V-belt molded body (LOA) is fitted and clamped in a metal mold, and a predetermined temperature and pressure are applied to sequentially perform vulcanization with cog forming, thereby curing the metal mold. The molded body (LO
The last vulcanized zone of A) is left unvulcanized for length II) before proceeding to the next step.

The next fourth step is a vulcanization operation involving cog formation of the unvulcanized Vept molded body shown in Fig. 9, but the vulcanization mold for this operation has an arched surface ( 43
A) A mold with a mold (44A) and an inverted trapezoidal groove are provided, and the bottom of the inverted trapezoidal groove is provided with a cog surface in which protrusions (45A) and concave grooves (46A) are alternately formed. The remaining uncured material was removed using a two-stage press vulcanizer equipped with an elastic matrix mold (47A) containing
/) The molded part was vulcanized with cog molding similar to that described with reference to FIG. ,) get '.

The press vulcanization process was continued using a mold without considering the existence of the cog defects, and the unvulcanized zone remaining at the end was subjected to the press vulcanization process accompanied by cog formation. By arranging a press vulcanization process using an elastic cog-equipped matrix mold that is highly elastic and whose length can correspond to the length of the unvulcanized belt molded body region, the remaining unvulcanized zone can be reduced. It is possible to easily absorb the deviation that occurs between the cog pitch of the belt and the mold cog pitch, without greatly damaging the shape of the belt cog pitch, and reducing the scrap of the elastic mother mold with cogs and the particularly complicated work. It was possible to obtain a long V-belt with a well-organized raised cog group without the need for the above.

It should be noted that the very slight deviation of the cog part of the belt obtained by the final vulcanization process obtained by the vulcanization method of the present invention compared to the other parts of the belt is due to the cog function exclusively aimed at the bending properties of the V-belt. Because of this, there was no functional defect, and even when wrapped around a small diameter pulley, it was possible to run without early abdominal cranking.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the form of an unvulcanized belt molded body, Figure 2 is a partial perspective view of an endless unvulcanized belt molded body, and Figure 3 is a press vulcanization process involving cog forming. A side view showing the process (however, only the mold part is cut away), FIG. 4 is an enlarged cross-sectional view taken along line A-A in FIG. Figure 5 is a side view showing the vulcanization process using a press vulcanizer equipped with an elastic matrix mold (only the mold part is shown cut away), and Figure 6 is a part of a V-belt with a long row edge cog. A perspective view, FIG. 7 is a diagram corresponding to FIG. 3 showing another embodiment, and FIG. 8 is a diagram corresponding to FIG.
An enlarged cross-sectional view taken along line B-B in the figure (however, the group of unvulcanized V-belt molded bodies is not shown), FIG. 9 is a diagram corresponding to FIG. 5 showing another example, and FIG. 10 is another example. FIG. 7 is a diagram corresponding to FIG. 6 obtained in Example 1. In the figure, (1) is an unvulcanized V-core rubber sheet, (4) is a tensile loaf, (5) is a top rubber sheet, (7) is a belt cog, and QO and (I OA ) are endless. Unvulcanized belt molded body, Oq. (IOA)' is a V-belt with a long row edge cog, c2
1+. (21A) is a pulley, (25+ (25A), (to)
(26A), @ (27A). f44+ (44A) is a metal mold,
A) (45A) indicates a protrusion, ■ (Tsukuda (30A)) (46A) indicates a concave groove, and (4η (47A) indicates an elastic matrix mold.

Claims (1)

[Claims] (1) A first step of forming an endless unvulcanized belt molded body by winding belt constituent materials including a V-core rubber sheet in a laminated manner around the outer peripheral surface of a forming drum, and then forming the unvulcanized belt molded body. A metal mold with a smooth surface on the front side and a metal mold with cog shapes formed at a constant pitch on the bottom side are arranged, and the endless belt molded body is sequentially placed between the pair of molds. In the plenue vulcanization process, which involves feeding and cog forming,
A second step in which the final press vulcanized region of the belt molded body being progressively fed is left unvulcanized;
The area is sandwiched between molds equipped with a metal mold with a smooth surface on the front side of the belt, and a stretchable elastic matrix with a cog shape at a constant pitch on the bottom side of the belt. A method for producing a long V-belt with cogs, characterized in that a third step of grain vulcanization accompanied by cog forming, and a V-shaped belt casing step are added after the first or third step.