JPH0659658B2 - Synthetic resin C-shaped ring and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a synthetic resin C-shaped ring used for an inner member of a tire chain, for example, and a manufacturing method thereof.

[Conventional technology]

BACKGROUND OF THE INVENTION Conventionally, as a tire chain used for traveling while being mounted on a tire of an automobile in the event of snow, freezing, etc., an inner chain located inside the tire, an outer chain located outside the tire, and an inside chain It was formed by a plurality of cross chains connected between the chain and the outer chain.

[Problems to be Solved by the Invention]

However, this tire chain has been mounted by putting the arm in the fender by jacking up the tire chain so that it can be mounted on the tire, or by laying the tire chain on the road surface and moving the automobile. Therefore, this conventional product is very troublesome to mount in a cold region, requires a long time, and is heavy, and it is inconvenient to move and transport.

Therefore, the present invention is an inner member that is easy to mount on a tire, has a high mechanical strength such as tensile strength, compressive strength (bending strength), etc., and is structurally robust, and is suitable for mass production and inexpensive. It is an object of the present invention to provide a synthetic resin C-shaped ring and the like and a method for manufacturing the C-shaped ring.

[Means for Solving the Problems]

Therefore, the present invention has been made to solve the above problems, and is a synthetic resin C-shaped ring for molding a ring body having an opening made of synthetic resin, and is made of an inorganic fiber such as glass fiber or carbon fiber. The first fibrous material obtained by cutting the cloth made of C into a substantially C-shape in a plane is arranged in almost the entire inside of the ring body on the top side facing the opening, and the cloth made of inorganic fibers is cut into a plane rectangular shape. A means of concentrically stacking and interposing the second fibrous material inside the ring body on the opening side with respect to the first fibrous material is adopted.

Further, the method invention as the related invention is such that the first fibrous material obtained by cutting inorganic fibers such as glass fiber and carbon fiber into a plane C shape and impregnated with a synthetic resin is formed on the top side of the mold. In the formwork by arranging and combining the second fibrous material arranged in the majority and cutting the cloth made of inorganic fibers into a flat rectangular shape concentrically on the opening side with respect to the first fibrous material. And the first and second fibrous materials are stretched, so that the fibrous material and the synthetic resin are made to conform to each other to bond the fibers of the first and second fibrous materials to each other. And a step of injecting a synthetic resin into the frame and then heating and molding while applying pressure.

[Action]

A plurality of fibrous materials impregnated with synthetic resin are set in a mold, and the fibers are stretched and blended to increase the adhesive strength of the synthetic resin, thereby strengthening the bond between the fibers, and the synthetic resin. After injection, pressurize and heat.

〔Example〕

 Hereinafter, the details of each invention will be described with reference to the drawings.

First, the present invention will be described together with related inventions as an example of an inner member of a tire chain as a ring body.

Reference numeral 1 denotes an inner member made of synthetic resin 2 and molded into a substantially C-shape in a plane. Examples of the synthetic resin 2 include thermosetting resins such as unsaturated polyester, urea resin, melamine resin, phenol resin, and epoxy resin, or polypropylene,
Thermoplastic materials such as polycarbonate and ABS resin are used, and the following examples are merely examples, and the present invention is not limited thereto.

Reference numeral 3 is a fibrous material. In order to make the structure of the inner member 1 as a ring body strong, the fibrous material 3 is made of, for example, an inorganic fiber such as glass fiber or carbon fiber. Moreover, as the fibrous material 3, for example, a first fibrous material 3A obtained by cutting a glass cloth having a basis weight of about 600 into a substantially C-shaped plane (meaning a substantially semi-circular shape), and a glass cloth cut into a substantially rectangular plane. A third fiber made of long fibers is concentrically combined inside the inner member 1 as a ring body to be molded with the above-mentioned second fibrous material 3B, and several sheets are appropriately laminated on the front and back sides, and in the middle. Form 3C is interposed.

Of these, the fibrous material 3A that is cut into a substantially C-shape in plan view
Is the lower half of the inner member 1 as a ring body to be molded as shown in FIG. Most of the inside of the section side is interposed. Then, the first fibrous material 3A has an apex when the same tensile force F is applied in the direction of opening the opening 1a of the inner member 1 as the ring body as indicated by arrows a, b, c and d. The side (lower side in FIG. 1) is stressed about twice as much as the side facing the opening 1a, so that only the long fibers extending in the circumferential direction substantially in the middle are interposed. 3rd fibrous material 3
Since C alone does not provide sufficient bonding strength between the fibers 3a in the radial direction, it is used to further strengthen the structure.

At this time, as shown in FIG. 6 (a), the first fibrous material 3A has a tensile strength and, in addition to the compressive strength of the inner member 1 as a ring body structure, the fiber of the fibrous material 3A is increased. 3a
It is preferable to use one that is cut so that its direction is approximately ± 45 ° with respect to the center line 1 of the ring body. Further, since the stress against the tensile force is smaller on the side of the opening 1a than on the top of the inner member 1, even if no fibrous material is interposed as a reinforcing material in the upper half, for example, only the synthetic resin 2 is used. Even if it is molded, it is structurally durable. However, in order to make the structure of the mounting hole 1b for connecting the connecting metal fittings 4a of the cross chain 4 against pulling in the radial direction, etc., as shown in FIG. The objects 3B, 3B; 3B, 3B are arranged around the mounting hole 1b of the opening 1a at appropriate intervals.

As shown in FIG. 6 (b), this fibrous material 3B has glass cloths aligned so that the fibers of the fibers are oriented in a direction parallel and orthogonal to the center line 1, and the length is 25 mm × width 60 mm.
Those that are cut to a certain degree are used.

In the figure, 5 is a tire for mounting the tire chain 6.

The configuration of one embodiment of the specified invention of the present application is as described above, and its operation will be described below together with the invention of the method as the related invention.

First, in order to mount the inner member 1 as the specified invention on the tire 5 together with the tire chain 6, the arm is put in the fender and it is mounted on the tire 5 as in the conventional case.

Next, the outline of the related invention in the case of manufacturing the inner member 1 as the specified invention of the present application will be described. First, as the first step, the fibrous material 3 impregnated with the synthetic resin 2 is desired as a reinforcing material in the mold 7. Lay to the thickness of. In this case, as the synthetic resin 2, for example, a thermosetting synthetic resin such as an unsaturated polyester resin, a urea resin, an epoxy resin, or a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, ABS resin is used. This is an example, and the present invention is not limited to this.

Further, as the fibrous material 3 as a reinforcing material, for example, an inorganic fiber such as glass fiber or carbon fiber is used in order to strengthen the structure of the inner member 1 as a ring body.
Moreover, as the fibrous material 3, for example, a basis weight 600
A glass cloth made of approximately glass fibers is cut into a substantially C-shape (meaning a substantially semi-arcuate shape) in a plane, and a first fibrous material 3A is provided in substantially the entire inner portion of the inner member 1 on the top side. , A second fibrous material 3B obtained by cutting a glass cloth into a substantially rectangular shape, concentrically combined with each other in the form 7, and in the middle thereof, a long third fibrous material 3C extending substantially entirely in the circumferential direction. These are used by concentrically combining through the above and by laminating a suitable number of sheets on the front and back sides (see FIGS. 6 (a), 6 (b), 9 and 10).

Among them, the first fibrous material 3A having a substantially C-shaped plane, which is laminated on the front and back of the C-shaped ring, extends substantially entirely in the circumferential direction as shown in FIG. 1 and FIG. The opening 1 serving as a reinforcing material for substantially the majority of the inner member 1 as a ring body to be molded in cooperation with the third fibrous material 3C located at
In order to make the structure stronger than a, tensile strength and compressive strength (in the following examples, the bending strength for measuring the pressure resistance by pressurizing the inner member 1 as a product in a substantially C-shape in a direction in which the opening 1a is narrowed) The same as the above) and the like, the structure is toughened by using the fiber 3a aligned and cut so that the direction of the fiber 3a is approximately ± 45 ° with respect to the center line 1 of the formwork 7. Therefore, it is preferable [see FIGS. 6 (a), 6 (b) and 9]. Further, the substantially rectangular fibrous material 3B, which is arranged substantially concentrically and at appropriate intervals with respect to the first substantially C-shaped fibrous material 3A, is in a direction parallel and orthogonal to the center line 1. The glass cloth is aligned so that the direction of the fiber 3a faces the
A piece cut into a substantially rectangular shape having a size of about 5 mm × width 60 mm is used. Further, glass fiber is used as the long third fibrous material 3C.

To impregnate the first and second fibrous substances 3A and 3B with the synthetic resin, a synthetic resin liquid is applied using a brush, or a glass cloth as an inorganic fiber is placed in a treatment tank containing the synthetic resin 2. Soak.

For the third fibrous material 3C made of long fibers, the synthetic resin 2 is impregnated by these methods, and then glass fibers as long fibers are inserted into the impregnating roller die to obtain an excess amount more than necessary. The one obtained by removing the synthetic resin 2 is used.

Further, in the form 7, the first and second fibrous materials 3A, 3
To lay B together concentrically, as shown in FIG. 9, a plane annular shape in the lower mold 7b of the mold 7 is formed so as to form the opening 1a of the inner member 1 as the ring body to be molded. The substantially rectangular fibrous substances 3B, 3B; 3B, 3B are arranged at equal intervals on the left and right sides of the center line ₁ in the concave portion 7b ₁ of the concave portion 7b ₁ and the substantially C-shaped fibrous substance 3A is arranged on the center line. As a reference, almost all of them are arranged in the recess 7b ₁ symmetrically. This is because, as described above, the tensile strength at the top of the inner member 1 as a ring body needs to be about twice as large as that near the opening 1a. This is because the strength of No. 3 cannot be sufficiently exerted, and the bonding strength between the fibers 3a cannot be made sufficient only by the fibrous material 3C made of long fibers extending substantially entirely in the circumferential direction.

Moreover, if the distance between the second fibrous substances 3B, 3B from the end of the opening 1a of the inner member 1 as a ring body is adjusted to be wide or narrow, the connecting metal fitting 4a for mounting the cross chain 4
The pitch of the mounting holes 1b for inserting can be adjusted to be wide or narrow.

Next, as a second step, first, the first and second lower fibrous substances 3A; 3B, 3B, 3B, and 3B of the 3B are stretched to extend the fiber structure to extend the fiber structure. 3a is made to fit, and the adhesive bonding force between the synthetic resins 2 pre-impregnated into the fibers 3a is increased, so that the fibers 3a of the fibrous material 3 are uniformly arranged and firmly bonded.

By the way, in the first step, fibrous materials 3A; 3B, which are concentrically arranged in almost all of the recess 7b ₁ of the mold 7,
3B; 3B and 3B are each formed by applying the synthetic resin 2 as an adhesive using a single brush, and a plurality of sheets are sequentially laminated. The number of laminated sheets is substantially rectangular fibrous material 3B. , 3B; 3B, 3B are located at the installation positions of the mounting holes 1b of the connecting metal fittings 4a of the cross chain 4, so two pieces are provided on the back surface side in order to improve tensile strength, compression strength, etc. The planar substantially C-shaped fibrous material 3A occupying the portion is a fibrous material 3C extending in the circumferential direction located in the intermediate layer.
In addition to the strength of No. 3 and the peculiarity of the product as a ring structure, three sheets are laminated on the back side to make the structure more robust.

That is, in this step, the fibrous material 3A; 3B, 3
B: When laminating 3B and 3B, the fibrous material 3A is rolled by a roller until the synthetic resin 2 as an adhesive becomes transparent.
3B, 3B; 3B, 3B can be squeezed to strengthen the mutual adhesive force between the synthetic resins 2 as an adhesive as described above, and the fibrous materials 3A, 3B, 3B; 3B, 3B When the tire 3 is attached to the tire 5 by strengthening the mutual connection between the fibers 3a, 3a by stretching and blending the fibers 3a, 3a, the tire 5 is subjected to tensile force due to centrifugal force, a load of an automobile or the like, or a road surface. The tensile strength and compressive strength (bending strength) are strengthened in response to the compression from.

This process is repeated several times as needed to increase these various strengths.

Next, in the third step, the fibrous material 3C made of long fibers is laminated on the upper surface of the fibrous material 3A; 3B, 3B; 3B, 3B on the back surface side. For this purpose, for example, 4400 tex × 4 combined yarns × 16 wraps of fibers dipped in a synthetic resin treatment tank are wound into the form frame 7 to apply tension, and then scissors are used in the form frame 7 to obtain the desired tension. The fibrous material 3C having a predetermined length may be formed by cutting the fibrous material 3C to the dimension of, and the fibrous material 3C may be substantially entirely interposed in the mold 7.

Then, as a fourth step, similar to the first step, the fibrous material 3A; 3B, 3B: 3B, 3B on the back surface side has the same shape and the same number of fibrous materials 3A; 3B, 3B on the front surface side. : 3
B and 3B are placed and stacked. Then, after injecting the required synthetic resin 2 that constitutes the inner member 1, the upper mold 7a as a lid is placed and set on the lower mold 7b.

Then, while applying a pressure according to the characteristics of the synthetic resin 2 to be used into the mold frame 7 to pressurize it, it is heated at a predetermined temperature for a predetermined time.

Further, as a fifth step, the upper mold 7a is opened to release the inner member 1 as a semi-molded product, and then the burrs formed on the outer periphery of the inner member 1 are removed, and the connecting fitting 4a of the cross chain 4 is removed.
A mounting hole 1b for mounting is opened, and then the opening 1a is trimmed to obtain a product.

(Example I) As the fibrous material 3, a plain weave (600 g /
A glass cloth of about m ³ ) with the eye direction as shown in Fig. 6 (a)
Fibers 3 toward the direction of ± 45 ° with respect to the center line 1
A first fibrous material 3A having a substantially planar C-shape that is cut by inclining the direction of a is used, three on the front surface side and three on the back surface side, for a total of six front and back surfaces, and FIG. As shown in the figure, a glass cloth that is parallel and orthogonal to the center line 1 is cut to form second fibrous substances 3B, 3B that are substantially rectangular and have a size of about 25 mm in length and 60 mm in width with respect to the center line 1. In the mold 7, an intermediate layer between the fibrous material 3A, which is cut into a substantially C-shaped plane on the front and back, and the fibrous material 3B, which is cut into a substantially rectangular shape, is used. A glass fiber, which is a long fiber in which 4400 tex × 4 united yarns are wound in the circumferential direction for about 16 rounds, is used. Then, as a synthetic resin, a thermosetting unsaturated polyester resin [for example, Polymer RTJ161 (trade name); manufactured by Takeda Pharmaceutical Co., Ltd.] is mixed with a curing agent in an amount of about 0.7 wt%.

That is, as shown in FIG. 1, FIG. 9 and FIG. 10, the fibrous material 3A cut into a substantially C-shaped plane is formed on the front surface side and the back surface side of the mold frame 7 so that the center line 1 is formed on almost all of the top side. Based on the above, three sheets are arranged at predetermined positions, a total of six sheets on the front and back sides. For this, first, unsaturated polyester resin is added to the fiber weight by about 30%.
First and second fibrous material 3 impregnated with about 3 weight percent
A; 3B, 3B: 3B, 3B are placed in the lower mold 7b and rolled using a roller to stretch the respective fibers 3a to bond the unsaturated polyester resins to each other as an adhesive, and the upper and lower layers. Fibrous material 3A; 3B, 3
B: The fibers 3a of 3B and 3B are strongly bonded to each other, and the three fibrous substances 3A on the back side are sequentially laminated at predetermined positions in the mold 7. Next, the fibrous material 3C as long fibers is replaced with the first and second fibrous materials 3A on the back surface side; 3B, 3B: 3B, 3
B is laminated almost entirely in the circumferential direction on the upper surface of B, and the first and second fibrous materials 3A;
3B: 3B, 3B on the back side of the fibrous material 3A; 3B, 3
B: By laminating in correspondence with 3B and 3B, the fibrous material 3C as long fibers extending in the circumferential direction is laminated in a sandwich shape to increase the tensile strength and the compressive strength and make the structure strong.

Then, after injecting the unsaturated polyester resin into the lower mold 7b until saturation is reached, the upper mold 7a is covered on the lower mold 7b. After that, while applying a pressure of about 30 kgf / cm ² and pressurizing the inside of the mold 7, heating in a temperature range of 50 to 60 ° C. for about 1 hour as a curing time, a synthetic resin-made substantially C-shaped product To obtain the inner member 1.

(Example II) In this example, instead of using the thermosetting unsaturated polyester resin in Example I as the synthetic resin, polypropylene which is a thermoplastic resin is used as an adhesive, and the mold is used. It is used as a synthetic resin to be injected into the resin 7, but this is an example of a thermoplastic synthetic resin and is not limited to this.

The glass fiber is used as the fibrous material 3 to form a substantially flat surface C.
As for the first fibrous material 3A and the substantially rectangular second fibrous material 3B that are cut in the shape of a letter, the same shape and the same number of the same materials as in Example I are used and the fibrous material 3 is used.
The same thing is used for the fibrous material 3C as a long fiber arranged between A and the fibrous material 3B.

Moreover, the fibrous material 3A; 3B, 3B: 3B into the mold 7
The sequence procedure of 3B follows the same conditions as the above example. Then, after injecting polypropylene, which should form the inner member 1 in the mold 7, pressurize about 70,000 kgf / cm ^{2 and}
The inner member 1'as a product was obtained by releasing the mold after heating at a temperature of ~ 210 ° C and then leaving it for a predetermined time.

The products obtained from Examples I and II were molded into substantially the same shape by using only the unsaturated polyester as the synthetic resin and the polypropylene without using the fibrous material 3 as the reinforcing member using the inner members 1 and 1 '. The following Table (I) was obtained by measuring the physical properties of the conventional inner member.

From Table (I) above, for the inner member 1 of Example I,
Tensile strength (bending strength) is 60 (kgf / mm ² ), compression strength (bending strength) is 60 (kgf / m ² ), and the mounting hole 1b for the fitting 4a of the cross chain 4 at the end of the opening 1a is The tear resistance is 350 (kgf / mm ² ), whereas the conventional inner member molded in the same shape as the synthetic resin 2 using only the unsaturated polyester resin of Example I has a tensile strength of 20. (Kgf), the tear resistance of the mounting hole 1b is less than half, 110 (kgf), and the compressive strength is 7 (kgf / mm ² ).

Therefore, regarding the tensile strength and the tear resistance of the mounting hole 1b, the tensile strength of Example I is 7.
5 times, the tear resistance of the mounting hole 1b is about three times as large, and the compressive strength of Example I is about 9 as compared with the conventional inner member molded only from unsaturated polyester resin. It is so big that it doubles.

Also, the inner member 1 'of Example II, the tensile strength is 40 (kgf), compressive strength 15 (kgf / mm ^2), the strength of the mounting hole is 250 (kgf). On the other hand, the conventional inner member molded in the same shape with polypropylene has a tensile strength of 15 (kgf), a compressive strength of 5 (kgf / mm ² ), and a mounting hole 1b.
The tear resistance is 80 (kgf).

Therefore, when the inner members 1, 1'of Examples I and II as tire chains 6 are attached to the tire 5, the inner members 1, 1'are subject to centrifugal force, sudden start, sudden stop,
An inner member as a ring body having a large physical property such as a tensile strength, a compressive strength, and a tear resistance of the mounting hole 1b of the connecting metal fitting to the cross chain 4 when the vehicle receives a tensile force or a load of an automobile. 1,1 'is obtained.

In each of the above examples, the fibrous material 3A having a substantially C-shaped plane is provided.
And the substantially rectangular fibrous material 3B through the fibrous material 3C having long fibers as an intermediate layer, the inner member 1 as a ring body,
A sandwich structure in which the inside of 1'is arranged on both the front and back sides has a fibrous material 3A, 3 in which the directions of the meshes 3a of the fibers are different.
B and 3C are within the scope of the present invention even if they are disposed on either the front surface or the back surface of the inner member 1, 1 '.

Further, in the above embodiment, the inner member 1, 1'is formed by combining three kinds of the first, second and third fibrous substances 3A, 3B, 3C. 3B, 3
It is also possible to select any one of the meshes of the mesh 3a of C and stack it over the entire surface of the substantially C-shaped inner member 1, 1 ', or to alternately form the fibrous material having meshes of ± 45 ° and orthogonal to each other. By laminating the structure of the inner member 1, 1 ', the tensile strength, compressive strength, tear resistance of the mounting hole,
It goes without saying that the structure can be robust.

〔The invention's effect〕

As described above, according to the present invention, a synthetic resin for an inner member, which is easy to mount on a tire, has high mechanical strength such as tensile strength and compression strength, is structurally robust, and is suitable for mass production and is inexpensive A ring body made of metal is obtained.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line I--I of FIG. 1, FIG. 3 is a sectional view taken along the line II--II of FIG. 1, and FIG. FIG. 5 is a side view showing the state, FIG. 5 is a front view showing the same use state, and FIG. 6 shows the fibrous material constituting the present embodiment. Among these, (a) is the top facing the opening. Plan view of the substantially C-shaped fibrous material disposed on the side of the opening, (b) is a plan view of the substantially rectangular fibrous material disposed on the side of the opening, and FIG. 7 is used for the present invention. 8 is a plan view showing a state in which a fibrous material is laid inside the mold, and FIG. 10 is a mold. FIG. 3 is a cross-sectional view of a state in which fibrous substances are arranged on both front and back surfaces inside and inner members are arranged. DESCRIPTION OF SYMBOLS 1 ... Inner member, 1a ... Opening part, 2 ... Synthetic resin, 3A ... 1st fibrous material, 3B ... 2nd fibrous material, 3C ... 3rd fibrous material, 7 ... ... Formwork, 7a ... upper mold, 7b ... lower mold.

Claims (9)

[Claims] 1. A synthetic resin C-shaped ring for molding a ring body having an opening made of synthetic resin, wherein a cloth made of inorganic fibers such as glass fibers and carbon fibers is cut into a substantially C-shaped plane. The first fibrous material is the first fibrous material in which the fibrous material of No. 1 is arranged in substantially the entire inside of the ring body on the top side facing the opening and a cloth made of an inorganic fiber is cut into a flat rectangular shape. A C-shaped ring made of synthetic resin, which is concentrically laminated and interposed inside the ring body on the opening side with respect to the object. 2. The first fibrous substance and the second fibrous substance are intervened by a third fibrous substance made of long fibers extending substantially entirely in the inner peripheral direction of the ring body. The synthetic resin C-shaped ring according to claim 1, wherein a suitable number of sheets are laminated on the front and back sides and molded. 3. The first fibrous material is cut and arranged so that the orientation of the fibers is approximately ± 45 ° with respect to the center line of the ring body, and the second fibrous material is arranged. The synthetic resin C-shaped ring according to claim 1, wherein the objects have fibers oriented in a direction parallel to and perpendicular to the center line of the ring body. 4. The synthetic resin C-shaped ring according to claim 1, wherein the synthetic resin is a thermoplastic synthetic resin. 5. The synthetic resin C-shaped ring according to claim 1, wherein the synthetic resin is a thermosetting synthetic resin. 6. Inorganic fibers such as glass fibers and carbon fibers are cut into a plane C shape, and a first fibrous material impregnated with a synthetic resin is arranged on almost the entire top side of the mold. A step of laying in a form by arranging a second fibrous material obtained by cutting a cloth made of inorganic fibers into a flat rectangular shape and concentrically arranging the second fibrous material on the opening side with respect to the first fibrous material. By stretching the first and second fibrous materials,
A step of allowing the fibrous material and the synthetic resin to conform to each other and bonding the fibers of the first and second fibrous materials to each other; and A method of manufacturing a synthetic resin C-shaped ring, which comprises the steps of: 7. A first fibrous substance and a second fibrous substance are appropriately interposed with a third fibrous substance, which is a long fiber extending substantially entirely in the circumferential direction of the ring body, in the middle. The method for producing a synthetic resin C-shaped ring according to claim 6, wherein a plurality of sheets are laminated on the front and back sides and molded. 8. The method for producing a synthetic resin C-shaped ring according to claim 6, wherein the synthetic resin is a thermoplastic synthetic resin. 9. The method for producing a synthetic resin C-shaped ring according to claim 6, wherein the synthetic resin is a thermosetting synthetic resin.