JPH089169B2 - Manufacturing method of anti-skid device for automobile tire - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in order that a vehicle such as an automobile can travel safely on a road such as snow or muddy road by preventing the slip.
The present invention relates to a method for manufacturing an anti-skid device for an automobile tire, which is mainly called a rubber chain and mainly comprises a mesh rubber band.

[0002]

2. Description of the Related Art The main body of an anti-skid device for automobile tires is roughly divided into mesh rubber bands. (Form 1) Both sides of the mesh rubber band and a tightening rope shown in FIGS. 1 and 3. And the like, which are connected to each other by using connecting metal fittings, (form 2) is found in Japanese Utility Model Publication No. 61-67204.
At the end of each mesh on each side of the mesh rubber band, a rope through hole is integrally formed at the same time as the vulcanization molding, and tightening lobes are connected to this rope through hole to tighten the mesh rubber band and the mesh. There is one that is connected with attached ropes. The following method is known as a method for producing the mesh rubber band that is the main body of the above two types of anti-skid devices for automobile tires.

(Conventional method 1) For example, Japanese Patent Publication No. Sho 58-49
According to the method disclosed in Japanese Patent Publication No. 366 and Japanese Patent Publication No. 58-13337, a groove for forming a mesh is formed on the surface of the press die, and a string-like core material coated with a plastic coating material is placed in the groove. There is a manufacturing method in which a mesh is formed by turning it around in a breath mold, and then this is integrally formed by press molding. It is said that the advantage of this method is that it is difficult to fit the mesh into the mold because the mesh cannot be formed into a mesh of uniform size in the conventional method of previously knitting the mesh. ing.

(Conventional Method 2) For example, Japanese Patent Laid-Open No. 62-19
8413 March and 1 of Japanese Patent Publication No. 2-33286
As seen in the invention, a non-vulcanized rubber wire material containing a core material is fitted into a mesh groove for braid of a non-slip net body in which a preformed template is recessed, and slip prevention is performed in the mesh groove. A preforming step of braiding the net body, pressing each intersection of this non-slip net body to temporarily fix the intersection, and a non-slip net body released from the above preforming template into a vulcanizing press die. There is a manufacturing method in which the non-slip net body is recessed to be fitted into the forming mesh groove and vulcanized. The advantage of this method is that the preforming template can be configured exclusively for preparatory preparation, so that the braiding work can be performed efficiently. The preformed product has its intersections temporarily fixed, so the shape is kept so that it does not fall apart, so it can be carried or stacked, and the work of fitting it into the vulcanization mold is easy. Therefore, it is said that there are advantages such that productivity can be improved and a large number of expensive vulcanization molds are not required.

(Conventional Method 3) There are methods found in JP-A-62-90228 and JP-A-62-148250. This method is suitable for manufacturing the above-mentioned anti-skid device shown in the form 2. This manufacturing method includes a rope through hole for each of the above-mentioned reticulated rubber bands between the upper and lower vulcanization molds for forming a reticulated rubber band having rope through holes at each end of each reticulated mesh. Middle vulcanized metal integrated with an outer frame that surrounds the outside of the upper and lower vulcanizing dies through the groove formed in the upper and lower dies through the groove forming the rope through hole Use a mold to place a middle vulcanizing mold around the supporting mold for preliminarily supporting the reticulated rubber band, and braid an unvulcanized rubber string with a reinforcing core using both of them and braid it on both sides. A rope through hole at each end of each mesh and a mesh rubber band having a rope through hole are preliminarily prepared, and each intersection of the mesh is crimped and released from the support mold. Next, this mesh rubber band This is a manufacturing method in which a middle vulcanization mold is attached between the upper and lower vulcanization molds, and the vulcanization molding is performed by press fitting and heating. The merit of this method is that the mesh-like rubber band support is formed in the frame of the medium vulcanization mold through the core metal inserted into each rope through hole, so the mesh separated from the support mold. The rubber band has a characteristic that it can be maintained accurately without being deformed, so it is a highly productive manufacturing method that has been implemented effectively from the time of patent application to the present. This is the first concrete example of using the system to make preliminary preparations.

(Conventional method 4) A method disclosed in Japanese Patent Laid-Open No. 64-75209 is disclosed in which a reinforcing core material is provided in the groove of a supporting die having a mesh-shaped rubber belt supporting groove. Braided unvulcanized rubber cord to pre-prepare the mesh rubber band
Next, the vulcanization molding upper and lower molds were attached at predetermined positions on the lower heating plate on the press vulcanizer, and the bracing dies with the above-mentioned mesh rubber bands preliminarily installed at the predetermined positions in between. Then, when the press vulcanization is closed and the press vulcanizer is opened by pressurizing and heating at low pressure for a short time, the reticulated rubber band adheres and moves to the upper mold surface at high temperature. When the press vulcanizer was taken out of the press vulcanizer and the press vulcanizer was closed again, the mesh rubber band adhered to the upper mold surface was in the mesh groove formed in the lower mold. A manufacturing method in which this is vulcanized by being pressed and heated. This method does not require crimping or removing at the crossing part of the supporting mesh, and the number of steps is small, and the work of fitting the meshed rubber band in the mesh concave groove of the lower mold can be done in a short time. It is a manufacturing method with good work efficiency and high production efficiency of expensive press dies and press vulcanizers.

[0007]

However, (conventional method 1)
The manufacturing method shown in 1 is widely used as a general manufacturing method for rubber products, and no new structure is found. In this method, a length of 14 m
The work of knitting an unvulcanized rubber string of 20 m into a reticulated rubber band is difficult, requires a long working time, and the efficiency of an expensive press die and press vulcanizer is poor, which is a basic problem. . In (Conventional method 2), when the cross section of the pre-installed diagonally crossed rubber strips is crimped and then released from the support type, the cross section is crimped and the mesh becomes disjointed. However, since the reticulated rubber band made of unvulcanized rubber cord has the fate that it is freely deformed in both the length direction and the width direction as soon as it is released from the supporting mold, Even if it is placed on the top, it does not match the mesh-shaped rubber band groove recessed in the press die surface at all, and it is a very difficult task with patience to fit the meshes one by one from one end to the mesh groove There is a serious problem that forces us to. Next, (conventional method 3) is a case in which the reticulated rubber band that is also the main body of the above-mentioned non-slip device is roughly classified (mode 2).
However, there is a problem in that the product shown in (Form 1) cannot be produced. In addition, the manufacturing method shown in (Conventional method 4) is an excellent manufacturing method because of its simple preparation die and working method. Due to the fate that the volume of the mesh-shaped groove groove to be drilled on the both sides must be approximately equal to each other, there is a problem that the mesh-shaped groove groove of the preparation die cannot be deeply drilled. Therefore, as shown in FIG. 1, it is suitable for a simple mesh having a linear mesh shape, but a complex mesh shape with many bends as shown in FIG.
There is a problem in that the speed of preparation becomes slower because the bent portion of the mesh is more likely to be removed from the concave groove during the knitting operation for fitting the unvulcanized rubber cord into the shallow concave groove of the preparation die.

The object of the present invention is to improve the above-mentioned problems and to yield the main body of the above-mentioned non-slip device, which yields to (form 1) when the reticulated rubber band is roughly divided, that is, 1
Needless to say, the present invention relates to a manufacturing method for the purpose of easily and efficiently manufacturing even the complicated shape shown in FIG.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to: (a) form a mesh-like rubber band adapted to the width and circumference of a tire, for vulcanization under-molding with a mesh-like groove recessed groove Using a device in which the mold and the upper molding mold used in pair with the mold are attached and fixed so as to face the predetermined positions of the upper and lower heating plates of the press vulcanizer,
(B) First, outside the press vulcanizer, a mesh-shaped groove groove corresponding to the mesh-shaped groove groove of the above-mentioned lower molding die is made to be reinforced and is reinforced in the separately provided groove of the supporting die. An unvulcanized rubber string with a core material is woven into it and pre-clamped into a reticulated rubber band to prepare it. (C) Next, the supporting mold is turned upside down and introduced downward between the upper and lower molding dies of the press vulcanizer, and the mesh-like groove grooves of both are aligned with the upper surface of the lower molding dies. After facing each other and projecting the braided rubber band support in the support die into the reticulated groove of the lower molding die, the support die is pulled out of the press vulcanizer. (D) Next, the present invention relates to a method for manufacturing an anti-slip device for an automobile tire, in which a reticulated rubber band is integrally vulcanized by pressurizing and heating with a press vulcanizer.

The support-type mesh-shaped groove groove used in the present invention is formed deeper than the initial thickness of the unvulcanized rubber containing the reinforcing core material used therein, and the width thereof is slightly wider than the thickness. Also, in order to prevent the mesh-shaped rubber strips formed in the concave grooves of the support type from being inverted and turned downward, the important points and points of the mesh-shaped groove groove are to prevent falling. The present invention relates to a method for manufacturing an anti-skid device for an automobile tire, which uses a support die in which a holding portion for supporting an unvulcanized rubber string containing a reinforcing core material by simply pushing it with a fingertip is provided at the part. The depth of the groove is preferably the height of the intersecting portion of the unvulcanized rubber cord containing the reinforcing core material, that is, the depth is about twice the thickness, which is excellent in workability. Is to make the width of the groove at each key point of the mesh band groove slightly smaller than the thickness of the unvulcanized rubber string,
Alternatively, the purpose can be easily achieved by using a wire spring, a leaf spring, or the like.

The preparation type used in the present invention is directed downward,
The mesh-shaped rubber band which is braided and formed in the mesh-shaped groove is projected, and it is moved into the mesh-shaped groove of the lower molding die. It is a method for manufacturing an anti-skid device for an automobile tire, which achieves its purpose by using a support die which is provided at the same time and is configured such that the protrusion pin is simultaneously operated. The device for simultaneously actuating the push-out pin can be easily provided by using the pressure for closing the press vulcanizer, and may be provided in the support type or the support type loading / unloading device.

[0012] Using the support die loading / unloading device used in the present invention, which supports the support die so that it can be turned upside down and upside down, and which can be accurately placed in and out of the lower molding die surface in the press vulcanizer. It is a method of manufacturing an anti-skid device for an automobile tire that achieves its purpose. The work can be carried out efficiently because the work is carried out as it is with the support die above the loading / unloading device that is pulled out from the press vulcanizer.

[0013]

[Operation] As described above, in the ready-to-wear type of the present invention, the mesh-shaped groove groove is provided with a depth deeper than the thickness of the unvulcanized rubber string with the reinforcing core material used therein and a width slightly wider than the thickness. The following actions are obtained because the key parts are provided with a pinching part at each point, and the pin is provided on the keying part, and the support die is directed downward so that it can be accurately opposed to the lower molding die. There is. (Operation 1) In the mesh knitting work, the unvulcanized rubber cord with the reinforcing core material can be easily fitted into the groove, and the groove is deep and is clamped at various points. There is an effect that the preparation does not come out of the groove.

(Operation 2) Even if the support die is turned upside down and directed downward, there is an effect that it does not fall because the mesh rubber belt support in the concave groove is held. Therefore, there is an effect that the mesh rubber support in the support mold can be accurately opposed to the mesh band groove of the lower molding die.

(Operation 3) Since the mesh rubber band support in the support mold can be accurately opposed to and aligned with the mesh band groove of the lower molding die, the eject pin can be used to instantaneously It has the effect of transferring the mesh-like rubber band into the groove of the lower molding die.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention shown in FIG. The following is an example of an anti-skid device for an automobile tire. (First step) Natural rubber and synthetic rubber are mixed with a vulcanizing agent, a vulcanization accelerator, a reinforcing agent, and other rubber chemicals, and kneaded.
Produce a rubber compound with excellent wear resistance, weather resistance, cold resistance, strength, etc., suitable for anti-skid devices.

(Second Step) The surface of the core material having a thickness compatible with the synthetic fiber and the natural fiber is subjected to a treatment for improving the adhesion with rubber, and the reinforcing core material 13 is coated with the above rubber compound. Therefore, it is extruded using a crosshead extruder to form the unvulcanized rubber cord 14 containing the reinforcing core material.

Next, the upper molding die 16 and the lower molding die 17 shown in FIG. 4 are combined with each other in FIG. 7 (a) (b) (c) (d) (e).
As shown in the figure, the upper and lower heating plates (2
9) A device mounted and fixed so as to face a predetermined position of (30), and the support die 20 shown in FIGS. 5 and 6 are provided in (a) (b) (c) (d) (e) of FIG. The reticulated rubber band 2 is vulcanized and molded by the following procedure using the support type loading / unloading device 31 attached as shown in the figure.

(Third Step) As shown in FIG. 7A, the unvulcanized rubber cord 14 containing the reinforcing core material is provided outside the press vulcanizer 28.
Are sequentially fitted along the mesh belt groove 21 of the support die 20, and the mesh portion is braided while being lightly pressed by the fingertips at the sandwiching portion 23. It is formed by knitting into 15.

(Fourth Step) Next, as shown in FIG. 7 (b), the support mold 20 is turned upside down and introduced into the press vulcanizer 28 by the support mold loading / unloading device 31, and the lower molding mold is introduced. When the reticulated rubber band support 15 in the support die 20 is exactly opposed to the reticulated band groove 22 of 17 and the lower platen 30 of the press vulcanizer is raised and closed, as shown in FIG. As shown in the figure, the mesh-shaped rubber band support 15 formed in the mesh-shaped groove groove 21 of the support die 20 is attached to the protrusion pin 24.
And the mesh-shaped groove 2 of the lower molding die 17
It fits in 2. Next, the lower heating plate 30 of the press vulcanizer is lowered and opened, and the support mold 20 is moved into the support mold loading / unloading device 31.
When taken out of the press vulcanizer 28 by
As shown in (d), the work of charging the mesh-shaped rubber band support 15 of the lower molding die 17 is completed.

(Fifth Step) Next, in the press vulcanizer 28, as shown in FIG. 7 (e), pressure and heat are applied to carry out vulcanization molding. Within this vulcanization molding time, the above-mentioned third step, the preparation work, is performed and completed.

(Sixth step) Immediately after the vulcanization molding is completed, the press vulcanizer 28 is opened and the vulcanized network rubber band 2 is taken out from the lower molding die 17. The above-described third step, fourth step, fifth step, and sixth step are sequentially repeated to repeatedly produce the reticulated rubber band 2.

(Seventh Step) After burr-plucking the mesh rubber band 2 formed as described above, (a) When the tire 12 is mounted, each mesh on the side of the mesh rubber band 2 which is the inner side. As shown in FIG. 1, the end of the cable and the tightening rope 3 are fixed by caulking with the rope fixing metal fitting 4 at equal intervals. Both ends of the tightening rope 3 are shown in Fig. 1.
As shown in FIG. 3, a connecting rope wheel 7 and a rope connecting hook fitting 9 are provided. Since the length of the tightening rope 3 used on the inner side is about 75% of the length of the mesh rubber band 2, the mesh rubber band 2 has a squeezed shape. (B) As shown in FIG. 1, when the tire 12 is mounted, the rope threading fitting 5 is caulked and attached to the end of each mesh on the side of the mesh belt 2 on the outer side. Attach the hook 6 for the rubber ring by crimping. Attach the rope connecting hook metal fitting 9 and the rope drawing metal fitting 10 to both ends of the side as shown in FIG. Next, using a tightening rope 3 which is slightly longer than the length of the reticulated rubber band 2, one end of which is connected to the rope connecting hook fitting 9 described above.
After connecting to each of the rope fittings 5, the other end of the tightening rope 3 is passed through the rope draw fitting 10 and the slip stopper for the automobile tire shown in FIG. It becomes tool 1. The above is one example of the anti-skid device for an automobile tire of the present invention.

As shown in FIG. 2, the slip stopper 1 for an automobile tire is arranged on the tire 12, and the rope rope 7 for connecting is hooked on the rope rope 7 for connecting inside first, and the inside is attached. When both ends of the tightening rope 3 are connected, and then the outer rope pulling metal fitting 10 and the rope connecting hook metal fitting 9 are connected and the rope drawing portion 11 is strongly pulled, the outer tightening ropes The non-slip device for automobile tires is tightened and attached so as to be in close contact with the tire. Further, as shown in FIG. 2, the rubber ring 32 is hooked on the rubber ring hook metal fitting 6 previously attached and pulled. When the squeezing is applied, the tire grip of the anti-skid device for an automobile tire of the present invention is mounted.

[0025]

Since the present invention is constructed as described above, it has an excellent action and has the following effects.

Even if the mesh knitting operation is carried out quickly, there is an effect that the support does not come out from the groove of the support-type mesh-shaped band groove, so that the mesh having a complicated shape as shown in FIG. However, it can be easily and efficiently manufactured.

Since there is an effect that it is not necessary to release the braided rubber band from the bracing die once, there is no need for a device for crimping the crossing portion of the braid, and the labor for carrying it and the labor for crimping are required. do not do.

Since the reticulated rubber band is not detached from the support die and removed from the support die, the fatal deformation of the support does not occur due to the die release. Therefore, the reticulated rubber strip having a complicated shape is also obtained. Can be manufactured.

The function of allowing the support mold to face downward by reversing it while the mesh rubber band support is built in the support mold is that the mesh rubber band support in the support mold is the mesh belt recess of the lower molding die. Since it can be fitted exactly facing the groove, it is possible in this state to use the ejector pin to transfer the braided rubber band support from the support die into the meshed groove concave groove of the lower molding die. This makes it possible to carry out this preparation accurately in a short time.

[0030]

[Brief description of drawings]

FIG. 1 is a plan view showing an entire non-skid device for an automobile tire according to an embodiment of the present invention.

FIG. 2 is an elevational view showing mounting of a tire grip on the anti-skid device for an automobile tire according to FIG. 1 of the present invention.

FIG. 3 is a plan view showing the whole of an anti-skid device for an automobile tire according to an embodiment of the present invention.

FIG. 4 is a lower molding die diagram for vulcanizing and molding a reticulated rubber band according to an embodiment of the present invention. (A) is a plan view showing the whole (b) is a sectional view of a portion AA

[Fig. 5] Fig. 5 is a view showing the shape of a braided rubber band according to an embodiment of the present invention. (A) is a top view which shows the whole. (B) is sectional drawing of BB. (C) is sectional drawing of CC section.

FIG. 6 is a partial perspective view showing a state where a braided rubber band is prepared for the support die according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing steps (a) and (b) of forming a mesh rubber band according to the example of the present invention.

FIG. 8 is a process for forming a reticulated rubber band according to an embodiment of the present invention.
It is sectional drawing which shows (c) (d) (e).

[Description of sign]

 1 Anti-slip device for automobile tires 2 Reticulated rubber band 3 Rope for tightening 4 Rope fixing metal fitting 5 Rope threading metal fitting 6 Rubber ring hook metal fitting 7 Connecting rope wheel 8 Rope connecting metal fitting 9 Rope connecting hook metal fitting 10 Rope pulling metal fitting 11 Rope drawing portion 12 Tire 13 Reinforcement core material 14 Unvulcanized rubber string with reinforcement core material 15 Reticulated rubber band support 16 Upper molding die 17 Lower molding die 18 Type matching pin 19 Type matching pin hole 20 Support type 21 Mesh Band-shaped groove (support type) 22 mesh band groove (for lower molding type) 23 clamping part 24 ejector pin 25 ejector pin support plate 26 spring 27 spacing holding pin between the support type and ejector pin support plate 28 press Vulcanizing bar 29 Press vulcanizing bar upper rip plate 30 Press vulcanizing bar lower heating plate 31 Preparation type loading / unloading device 32 Rubber ring

Claims (4)

[Claims] (A) A lower molding die for vulcanization molding having a mesh-shaped groove groove for molding a mesh-shaped rubber band adapted to the width and circumference of a tire, and in combination with this Using a device in which the molding die and the press vulcanizer are fixed to the upper and lower heating plates facing each other at a predetermined position, (b) first, outside the press vulcanizer, the lower molding die Pre-sheathed to the mesh-shaped rubber band by braiding a powdered vulcanized rubber string with a reinforcing core into the groove of a separately-prepared support type with a mesh-shaped groove groove corresponding to the mesh-shaped groove groove of Prepare for preparation. (C) Next, the supporting mold is turned upside down and introduced downward between the upper and lower molding dies of the press vulcanizer, and the mesh-like groove grooves of both are aligned with the upper surface of the lower molding dies. After facing each other and projecting the mesh-shaped rubber band support in the support die into the mesh-shaped groove groove of the lower molding die, the support die is pulled out of the press vulcanizer. (D) Next, a method for manufacturing an anti-skid tool for an automobile tire, which comprises pressurizing and heating by a press vulcanizer to integrally vulcanize and form a reticulated rubber band. 2. The braided groove of the support type is formed deeper than the thickness of the unvulcanized rubber cord with a reinforcing core material used therein, and its width is slightly wider than the thickness. In addition, in order to prevent the mesh-shaped rubber band formed in the groove from falling when the support die is turned upside down, reinforcement is made at each of the important points of the mesh-shaped groove groove. 2. The method for manufacturing an anti-skid device for an automobile tire according to claim 1, wherein a support die provided with a holding portion for supporting the unvulcanized rubber cord containing a core material by simply pressing it with a fingertip is used. 3. A braiding die is directed downward, and a braided rubber band which is braided and formed in a braided groove of the bracing die is projected, and is transferred into the braided groove of the lower molding die. 2. The method for manufacturing an anti-skid device for an automobile tire according to claim 1, wherein a support type is provided in which each pin is provided at each important point of the support type and the protruding pins are simultaneously operated. 4. A support die loading / unloading device is used which supports the support die so that it can be turned upside down and upside down, and which can be accurately placed in and out of the lower molding die surface in the press vulcanizer. A method for producing the anti-skid device for an automobile tire described above.