JP3583566B2 - Vulcanization method for rubber products - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to, for example, a method of vulcanizing automobile anti-vibration rubber, industrial small rubber products, or other rubber products. In particular, the rubber is injected into a cavity in a predetermined mold, and then heat and pressure are reduced. The present invention relates to a method for vulcanizing a rubber product which is vulcanized for a predetermined time.
[0002]
[Prior art]
In general, as a vulcanizing method of rubber products, for example, a method of injecting a rubber material into a single mold and applying heat and pressure until the end of the vulcanization and holding the rubber material for a certain period of time is widely used.
[0003]
However, when the time required for vulcanization is long, the rotation rate of a press device for applying heat and pressure is reduced, which leads to an increase in manufacturing costs.
[0004]
Therefore, in order to increase the productivity, as shown in FIG. 8, for example, when a rubber material is injected into the mold 102 at an injection station 101 provided at an appropriate portion of the turntable 100, the mold 102 is transferred to the turntable 100. A rotary type in which the turntable 100 is rotated by an appropriate amount of angle (pitch) every time when it is mounted and sent out is developed.
[0005]
In this rotary type, the rubber products in the mold 102 that are successively sent out go through a predetermined heating / pressing step and the like, and finally, in the disassembling / removing station, the rubber products are removed from the mold 102 on the turntable 100. They are taken out sequentially.
[0006]
[Problems to be solved by the invention]
However, in such a rotary type, the vulcanization time is restricted (limited) by the number of divisions (pitch) of the turntable and the cycle time required to feed out one pitch, and cannot be freely changed and adjusted. Varying the initially set vulcanization time is difficult in practice.
[0007]
That is, in such a configuration, it is actually impossible to shorten the vulcanization time while securing a predetermined (per unit time) production amount. You must save the hourly production.
[0008]
Also, when the vulcanization time is longer than a certain cycle time, the number of divisions (pitch) of the turntable inevitably increases, and the radius of the turntable also increases accordingly. This will require a large amount of money, which will increase capital investment costs.
[0009]
Further, in order to continue the pressurization and heating of the mold in each unit of the turntable, both the pressurizing device and the heating device must be installed in the appropriate units corresponding thereto, respectively. Driving (operation) cost is also large.
[0010]
In view of the above circumstances, the present invention can significantly reduce capital investment and operation (electric power) costs of a press device and the like required to secure a predetermined production amount, and reduce installation space by half compared to the conventional case. It is an object of the present invention to provide a method for vulcanizing a rubber product which can be suppressed to the following and can freely change the extension / reduction of the vulcanization time.
[0011]
[Means for Solving the Problems]
That is, the invention according to claim 1 is a method for vulcanizing a rubber product, comprising injecting a rubber material into a cavity in a predetermined metal mold, and then applying heat and pressure for a predetermined time to vulcanize the rubber product. Each time a rubber material is injected into the mold set inside the injection device, the injected mold is sequentially injected into a pressurizing / heating device provided inside the injection device or outside the injection device. By stacking multiple in series and applying pressure to the injected rubber material using the own weight of the mold and external pressure in the pressurizing and heating device, heating and keeping the stacked molds warm Accelerates and advances the vulcanization of the rubber in the mold, applies pressure by a pressurizing cylinder in the direction of stacking in series, attaches a pair of holders to the grooves provided on both sides of the mold, the pressure assist, in the next mold Each of the injection operation of the arm material, in which we removed from a plurality of said mold portions stacked long ones vulcanization elapsed time on the series of molds are stacked. Further, in the invention according to claim 2, in the pressurizing / heating device, a heater is fixed to one side via a heat insulating plate, and a heater provided on the other side of the heat insulating plate is movably provided by a pressurizing cylinder. It is configured such that a plurality of molds are stacked between heaters. Further, in the invention according to claim 3, the pressurizing / heating device is provided outside the injection device, and the injection operation and the vulcanization operation are partially performed simultaneously.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a vulcanizing apparatus used in the method for vulcanizing a rubber product according to the present invention. In this embodiment, in order to make the explanation easy to understand, the vulcanizing method is described before the method for vulcanizing a rubber product. The description starts with the sulfurizing device.
[0013]
The vulcanizing apparatus 1 according to the present embodiment includes a pressurizing cylinder 3 for applying a predetermined pressure to a plurality of (always four in this embodiment) metal molds (hereinafter abbreviated as mold 2). A plurality of heaters 4 for heating these molds 2 to an appropriate temperature under the pressurizing condition are provided. In FIG. 1, reference numeral 5 denotes a heat insulating plate.
[0014]
Further, in this embodiment, among the molds 2 into which the rubber material has been injected, the injection time of the mold 2 is shortest (in order of 1, 2, 3, 4 ; the indications on the drawing are M1, M2, M3, M4). in the) are those in series arranged ahead from the top, also they are processed in advance before the separately provided unillustrated injection device the injection of the rubber material and the vulcanizing apparatus.
[0015]
Further, the vulcanizing apparatus is provided with a pair of right and left holders 6 shown in FIG. 2, and the pressing force is supplementarily increased from the side using the holders 6. Therefore, the mold 2 has grooves on both sides into which the arms of the holder 6 enter.
[0016]
It should be noted that if the mold used here has the same outer dimensions, there is no problem even if the cavity dimensions are of course different. Therefore, production systems of different sizes can be performed.
[0017]
Next, a method for vulcanizing a rubber product according to the present invention will be described with reference to a vulcanizing apparatus according to the previous embodiment.
In the vulcanization method of this embodiment, vulcanization is performed outside of the injection machine, and comprises a first step S1 to a sixth step S6. That is, in the vulcanization method of this embodiment, when the rubber material is injected toward the mold 2 set in the injection machine, the entire mold 2 is taken out from the injection device and set in a predetermined portion in the vulcanization device 1 sequentially from below. I will do it. Here, the first mold 2 will be described from the point where four molds (numbers 1 to 4) have already been injected and set in the vulcanizing apparatus.
[0018]
In the first step S1 of this embodiment, as shown in FIG. 3, four molds 2 are arranged in series in a vulcanizing apparatus 1.
That is, in FIG. 1, four molds 2 are set in series in the up-down direction, and the upper surfaces of the four molds are mounted on an appropriate fixed portion (provided in a stationary state) via a heater 4 and a heat insulating plate 5. Abut. The lowermost lower surface is in contact with the pressurizing cylinder 3 via the same heater 4 and heat insulating plate 5.
[0019]
In this embodiment, for example, as shown in FIG. 2, three molds 2 to 4 of the molds 2 are clamped by the holder 6, and these molds 2 are simultaneously pressed in series. . In this embodiment, the heaters are heated not only vertically but also simultaneously by other heaters provided at least at four positions in the front, rear, left and right directions (not shown).
[0020]
Next, in a second step S2, these molds 2 are heated and pressurized for vulcanization. The heating and pressurizing time is the time from mounting to the vulcanizing apparatus to removal, that is, four molds. This is the time required to mount the mold 2. After the vulcanization, the pressurizing operation of the pressurizing cylinder 3 and the heater 4 is stopped, and the holding operation by the holder 6 is stopped.
[0021]
Next, in a third step S3, after the pressurizing operation is stopped, as shown in FIG. 3, the mold 2 having the longest vulcanization elapsed time, that is, the mold 1 (M1 in the drawing) is removed from the vulcanization apparatus.
[0022]
Next, in a fourth step S4, if it is confirmed that the after vulcanization time has elapsed for the mold (No. 1) 2 removed from the vulcanizing apparatus, the rubber product is removed from the mold 2.
[0023]
Further, in a fifth step S5, an appropriate release agent is applied to the mold of the mold (having the number 1) 2 after the product is taken out, and is set in an injection machine to inject the rubber material into the mold.
[0024]
In the sixth step S6, the mold (number 1) into which the rubber material has been injected in this manner is taken out of the injection machine, and a plurality of molds 2 arranged in series in a vulcanizing apparatus as shown in FIG. Insert and set at the bottom of.
[0025]
When the mold (No. 1) 2 is set in this way, as shown in FIG. 4, the holder 6 is replaced to clamp the mold (No. 3, 4, 1) 2, and the same operation is performed again from the second step S2. Steps are repeated.
[0026]
In this embodiment, four molds 2 are used for convenience and are repeatedly used. In addition, for example, as shown in FIG. 6, five or more molds (in this case, 8), and the injection operation and the vulcanization operation may be partially performed simultaneously.
[0027]
In addition to the stacking vulcanization operation outside the injection machine as in this embodiment, for example, as shown in FIG. Whether to stack from the side or from above depends on whether the injection nozzle 71 is arranged above or below, but the basic principle is the same.
[0028]
Further, in these embodiments, the molds 2 are stacked in the up-down direction for easy understanding of the description. However, it is also possible to apply the mold 2 in the horizontal direction by turning the mold 2 down by 90 degrees.
[0029]
In these examples, the time required for vulcanization is the minimum vulcanization time during which the molds are stacked.
[0030]
Conversely, when a long time is required for vulcanization, if the after-vulcanization time in the fourth step S4 is as long as necessary, the vulcanization time can be easily extended.
[0031]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained according to the pressurizing / heating method in which the molds are arranged in series, as compared with the conventional method of individually pressing and heating the molds.
(1) Significant reduction in capital investment costs for the press part or turntable part required for pressurization and heating;
(2) In addition, the power for operating the press device can be greatly reduced,
(3) The installation space is about half that of the conventional one,
(4) Being able to flexibly respond to changes in vulcanization time.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a vulcanizing apparatus used in a method for vulcanizing a rubber product according to the present invention.
FIG. 2 is an explanatory view of the same.
FIG. 3 is an explanatory view of the same.
FIG. 4 is an explanatory view of the same.
FIG. 5 is a flowchart showing a method for vulcanizing a rubber product according to the present invention.
FIG. 6 is an explanatory diagram showing a method for vulcanizing another rubber product according to the present invention.
FIG. 7 is an explanatory view showing a method for vulcanizing still another rubber product according to the present invention.
FIG. 8 is an explanatory view showing a conventional example.
[Explanation of symbols]
1 Vulcanizer 2 Mold (die)
3 Pressing cylinder 4 Heater 6 Holder

Claims (3)

After injecting the rubber material into the cavity in a predetermined metal mold, a method of vulcanizing a rubber product to be vulcanized by applying heat and pressure for a predetermined vulcanization time,
Inject the rubber material into the mold set inside the injection device every time,
A plurality of molds after this injection are stacked in series in the order of injection into a pressurizing / heating device provided inside the injection device or outside the injection device,
In the pressurizing and heating device, pressure is applied to the injected rubber material using the weight of the mold and external pressure, and the stacked molds are heated and kept warm to apply the rubber in the mold. Promotes and advances sulfuric acid,
In the direction of stacking in series, pressurizing force is applied by a pressurizing cylinder, and a pair of holders are attached to the grooves provided on both sides of the mold to assist the pressing force on multiple molds.
Each time the rubber material is injected in the next mold, a mold having a long vulcanization elapsed time among the stacked molds is removed from the plurality of mold parts stacked in series. Vulcanization method for rubber products. In the pressurizing / heating device, a heater is fixed on one side via a heat insulating plate, and a heater provided on the heat insulating plate is movably provided by a pressing cylinder on the other side, and a plurality of molds are stacked between the two heaters. The method for vulcanizing a rubber product according to claim 1, wherein the method is configured. The vulcanizing method for a rubber product according to claim 1 or 2, wherein the pressurizing / heating device is provided outside the injection device, and the injection operation and the vulcanization operation are partially performed simultaneously. .

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