JPH0620747B2 - Vulcanizing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vulcanizing apparatus for producing a high-precision rubber roller used in an electrophotographic copying machine or the like.

[Conventional technology]

Generally, when molding a rubber roller, as shown in FIG.
Forming a pair of two pieces, each of which is composed of a lower mold 3a and an upper mold 3b (the mating surface is hidden and invisible) and each of which has a semi-cylindrical roller-forming recess 1 and a shaft-fixing recess 2 on the mating surface. The mold 3 is used. Then, the shaft-shaped core metal member 4 is attached to the lower mold 3a in a state where both ends thereof are positioned in the shaft body fixing recesses 2 and the lower mold 3 is
The lower surface of the upper mold 3b is matched with the upper surface of a, and in that state, in the space formed by the outer peripheral surface of the core metal member 4 and the inner peripheral surface of the roller forming recess 1 of the molding die 3, A cylindrical rubber roller is formed on the outer circumference of the core metal member 4 by press-fitting unvulcanized rubber in a heated state.

[Problems to be solved by the invention]

However, since the molding die 3 is divided into upper and lower halves, burrs are generated on the outer peripheral surface of the rubber roller to be formed at a portion corresponding to the mating surface of the lower die 3a and the upper die 3b. Due to the occurrence of the burrs, there is a problem that the portion is not formed into a predetermined curved surface, and correction by polishing or the like is required after the molding. Further, in the method using the mold 3, the temperature of the unvulcanized rubber is set to about 100 ° C. and the temperature of the mold 3 is increased in order to easily fill the unvulcanized rubber into the molding die 3. Is heated to about 160 ° C. As described above, since the molding is performed in a state where the molding die 3 is at a high temperature, the expansion pressure of the unvulcanized rubber becomes small, and the surface of the rubber roller to be molded has waviness (wavy unevenness) due to contraction or the like. As a result, there is a problem in that it is necessary to correct the portion in which the undulation occurs by polishing or the like. Therefore, the inventors of the present invention have invented a mold for manufacturing a high-precision rubber roller that does not cause burrs and undulations, and have already filed an application (Japanese Patent Application No. 63-70344). That is, this mold is as shown in FIG. 4, and has a cylindrical molding mold 5.
Is provided with an injection lid 7 with an injection hole 6 at one end thereof, and an air escape lid 9 with an air escape hole 8 is provided at the other end thereof, which are provided on the facing surfaces of the injection lid 7 and the air escape lid 9, respectively. By fitting both ends of the cored bar member 4 into the recesses, the cored bar member 4 is fixed in the molding die 5. Further, closing lids 10 and 11 are further provided outside the injection lid 7 and the air escape lid 9 so that the injection hole 6 and the air escape hole 8 can be closed.
Therefore, there is no mating surface on the molding die 5, and burrs do not occur on the formed rubber roller. Further, the temperature of the molding die 5 is set to a low temperature, and in that state, the space formed between the inner peripheral surface of the molding die 5 and the outer peripheral surface of the core metal member 4 is not yet exposed in the space. After press-fitting vulcanized rubber, mold 5
It becomes possible to mold the rubber roller by closing both ends with the closing lids 10 and 11 and heating the unvulcanized rubber together with the mold. Therefore, at the time of heating, the rubber roller expands, and the expansion pressure generated by the expansion is sufficiently applied to the inner peripheral surface of the hole of the molding die 5, so that a highly accurate rubber roller without waviness can be obtained. Is.

However, in the above mold, both ends of the mold are fixed by a press 12 as shown in FIG. 5 to maintain the closed state,
In that state, the mold is put into the heating furnace together with the pressurizer 12 for heating, so that the whole is bulky, a special carrying device is required, and a large heating furnace is required. I have a problem. Further, since the work of attaching the mold to the pressurizing machine 12 is complicated, there is a problem that it takes a long time to manufacture.

The present invention has been made in view of such circumstances, and an object thereof is to provide a vulcanizing apparatus that can be easily transported, can reduce the size of a heating furnace, and can significantly reduce the manufacturing time. .

[Means for solving problems]

In order to achieve the above object, the vulcanizing apparatus of the present invention,
A cylindrical molding die whose one end side is formed in an engaged portion for mounting a crimp type one-touch metal fitting, and a mounting means for coaxially mounting a shaft-shaped core metal member in the hole of the molding die, A crimp type one-touch metal fitting that is detachably attached to the engaged portion of the molding die and can close one end of the hole portion,
It has a ventilation hole that is attached to the other end of the molding die and connects the space formed between the inner peripheral surface of the hole and the outer peripheral surface of the core metal member to the outside, and the other end side is a crimp type one-touch. A lower die formed on an engaged portion for attaching a metal fitting and a crimp type one-touch metal fitting detachably attached to the engaged portion of the lower die and capable of closing the vent hole are adopted.

[Action]

That is, the present invention does not maintain the closed state of the molding die by fixing both ends with a pressure machine, but closes the molding die with a crimp type one-touch metal fitting and uses the crimping force of the one-touch metal fitting itself. It is designed to maintain a closed state. Therefore, it is not necessary to put the pressurizer into the heating furnace together with the mold, which facilitates transportation and enables the heating furnace to be significantly downsized. Further, since the crimp type one-touch metal fitting can be attached by one-touch, the work is facilitated and the work time can be greatly shortened.

Next, a detailed description will be given based on an embodiment of the present invention.

〔Example〕

FIG. 1 shows an embodiment of the present invention. That is, in the figure, 15 is a cylindrical molding die in which the outer circumferences on both end sides are formed to have a small diameter, and the inner peripheral surface of the rubber roller forming hole 16 provided along the central axis is finished to be a mirror surface, On the surface, a plurality of ring-shaped fins 17 are arranged in parallel along the circumference at regular intervals in the axial direction. The small-diameter portion 18 on the one end side is formed as an engaged portion for attaching the crimp type one-touch fitting 19 and the outer peripheral surface of the small-diameter portion 20 on the other end side is formed as a screw portion. Reference numeral 21 denotes a grooved carrying ring provided along both sides of the molding die 15 along the circumference.
Reference numeral 2 denotes a core metal member for supporting the rubber roller, which is disposed in the rubber roller forming hole 16. The cored bar member 22 is arranged coaxially with the rubber roller forming hole 16 by fixing one end to the attachment / detachment fitting 19 and the other end to the lower mold 23. More specifically, the lower die 23 is made of a cap-shaped body having a screw hole 24 formed at one end thereof so that the screw hole 24 can be fitted to the small diameter portion 20 of the molding die 15. At the center of the bottom portion, a fitting recess 25 is provided, in which air bleeding grooves 25a are provided on the peripheral surface at regular intervals along the circumference, and a small diameter air vent hole 26 is provided from the center of the bottom of the fitting recess 25 to the other end. Has been drilled. Then, by screwing the screw hole 24 into the small-diameter portion 20, the screw hole 24 is attached to the other end of the molding die 15, and in that state,
By fitting the other end of the cored bar member 22 into the fitting recess 25, the other end of the cored bar member 22 is inserted into the rubber roller forming hole 16
It is positioned at the center of. The outer peripheral surface of the lower die 23 on the other end side is formed as an engaged portion for attaching a crimp type one-touch metal fitting 27. By attaching the cap-shaped one-touch metal fitting 27 to this engaged portion, The other end of the air vent hole 26 of the mold 23 can be closed.
The one-touch metal fitting 19 attached to the small-diameter portion 18 on one end side of the molding die 15 is made of a cap-shaped body,
As shown in FIG. 1, from the cap-shaped bottom side toward the opening side, the spring material 28, the plate-shaped spring receiving portion 29 provided with a protrusion 29a at the center of the other end surface, and the ring-shaped core metal receiving portion. 30 are arranged in order. Then, by inserting one end of the cored bar member 22 into the center hole 30a of the cored bar receiver 30, one end of the cored bar member 22 is positioned at the center of the rubber roller forming hole 16, and in this state, the elasticity of the spring member 28 is increased. The core metal member 22 is positioned by the projection 29a of the spring receiving portion 29 so as not to shift. The one-touch metal fittings 19 and 27 are composed of known crimp-type metal fittings so that they can be attached / detached to / from the engaged portion by a one-touch operation. It has an airtight structure that does not occur.

In this configuration, first, the lower mold 23 is attached to the other end side of the molding die 15, and the molding die 15 is erected so as to be below the lower mold 23 side. Next, the core metal member 22 having the outer peripheral surface coated with the adhesive is inserted into the rubber roller forming hole 16 from one end (upper end) side of the molding die 15, and the other end (lower end) portion is fitted into the fitting recess of the lower die 23. 25. Next, the molding die 15 together with the cored bar member 22 is
At a temperature of up to 30 ° C., in that state, unvulcanized rubber heated to a temperature of 100 ° C. in a heat-retaining pot (not shown) of the rubber injecting machine is opened from one end side opening of the molding die 15 to a rubber roller forming hole. It is pressed into the air portion formed between the inner peripheral surface of 16 and the outer peripheral surface of the cored bar member 22. As a result, the unvulcanized rubber is filled in the air portion while being cooled by the low temperature of the molding die 15, and pushes air into the space portion through the air bleed groove 25a and the air bleed hole 26 to the outside. On this occasion,
The unvulcanized rubber excessively supplied is also pushed out to the outside together with the air. Further, the action of the fins 17 formed on the outer peripheral surface of the molding die 15 cools the unvulcanized rubber. Next, a one-touch metal fitting 27 is attached to the other end of the lower mold 23 to close the air vent hole 26 of the lower mold 23, and then one end of the cored bar member 22 is inserted into the center hole 30a of the cored bar receiver 30. , One-touch metal fitting 1 at one end of the molding die 15
9 is attached to close one end of the rubber roller forming hole 16. Then, a plurality of such molds are prepared, and these molds are rolled into a hot air drying furnace 32 having a multi-stage inclined path 31 formed therein as shown in FIG. The unvulcanized rubber is heated and vulcanized with. As a result, the molding die 15
Since the inside is in a sealed state, the expansion pressure caused by the expansion of the unvulcanized rubber due to heating remains unchanged, and the rubber roller forming hole 16
Is applied to the inner peripheral surface of, and the repulsive force causes the surface of the molded body to
It is formed into a uniform curved surface corresponding to the inner peripheral surface of the rubber roller forming hole 16. Then, the formed molded body is used as the core metal member 22.
At the same time, the rubber roller formed on the outer peripheral surface of the cored bar member 22 can be obtained by taking it out from the molding die 15 and cooling it. At this time, since the rubber roller is adhered to the outer peripheral surface of the cored bar member 22 with an adhesive,
Can be easily taken out from the molding die 15. Further, the obtained rubber roller is a good one having no surface burrs or the like. In the above case, the untreated mold 33 is adapted to be put into the hot air drying oven 32 through the inlet 34 on the upper side of the hot air drying oven 32.
The mold 33, which has entered the hot air drying furnace 32, moves upward in a state in which the groove portion of the transfer ring 21 is engaged with two rail portions (not shown) provided on the upper surface of the inclined path 31. It is sequentially transferred from the slope 31 to the lower slope 31. And
The treated mold 33 is taken out from the take-out port 35 on the lower side of the hot air drying furnace 32.

As described above, according to the present invention, since the mold 33 can be moved by rolling, it becomes easy to carry and
Since a large pressurizer is not required, the hot air drying oven 32 can be small. Further, in addition to being easy to carry, the crimp type one-touch metal fittings 19 and 27 can be attached by one-touch, so that the working time can be greatly shortened (the die shown in FIG. 4 was used. In the case of 77 minutes, in the case of using this mold, it was 45 minutes). Further, since the integrally formed molding die 15 provided with the rubber roller forming hole 16 is used, burrs are eliminated in the formed rubber roller, and the unvulcanized rubber is heated at the time of heating after press-fitting the unvulcanized rubber. The expansion pressure is sufficiently applied to the inner peripheral surface of the rubber roller forming hole 16, and a highly accurate rubber roller free from deformation such as waviness can be obtained. As a result, correction work and the like after forming the rubber roller are unnecessary.

〔The invention's effect〕

As described above, according to the vulcanizing apparatus of the present invention, it becomes easy to carry, the heating furnace can be downsized, and the manufacturing time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view for explaining a state in which unvulcanized rubber is heated and vulcanized in a hot air drying furnace, and FIG. 3 is a perspective view of a conventional example. FIG. 4 is a longitudinal sectional view of another conventional example, and FIG. 5 is an explanatory view showing a state in which it is attached to a pressure device. 15 ... Molding die, 16 ... Rubber roller forming hole, 18,
20 …… Small diameter part, 19,27 …… One-touch metal fittings, 22
...... Core metal member, 23 ...... Lower mold, 24 ...... Screw hole, 25 ...
… Mating recess, 25a …… Air vent groove, 26 …… Air vent hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 31:32 4F

Claims (1)

[Claims] 1. A cylindrical molding die having one end side formed in an engaged portion for mounting a crimp type one-touch metal fitting, and a shaft-shaped core metal member coaxially mounted in a hole portion of the molding die. Attachment means, a crimp type one-touch metal fitting that is detachably attached to the engaged portion of the molding die and can close one end of the hole portion, and an inner circumference of the hole portion that is attached to the other end of the molding die. A lower mold having a ventilation hole that communicates the space formed between the surface and the outer peripheral surface of the core metal member with the outside, and the other end side formed in the engaged portion for mounting the crimp type one-touch metal fitting, A vulcanizing device, comprising: a crimp type one-touch metal fitting that is detachably attached to the engaged portion of the lower mold and that can close the vent hole.