JPH07117107B2 - Bearing sealant and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bearing sealant that enables mass production of a bearing sealant and a method for manufacturing the same.

[Conventional technology]

Conventionally, a method for manufacturing a bearing sealant is as shown in FIG. 7, in which a metal mold 8 for reinforcing material is placed on a lower die C4 in a die for molding the bearing sealant, and a synthetic metal is placed thereon. After supplying the rubber 9, closing the upper mold C3 and heating for a certain period of time to vulcanize the rubber, remove it from the molds C3, C4 and remove the burr 10.
The desired bearing sealant was obtained.

Therefore, the molding process of the core metal and the molding process of the sealing material for the bearing are made in completely different processes, so there was an invention of a defective product due to a mistake in the type of core metal, forgetting to put it in, misalignment, feeding by stacking two sheets, etc. Moreover, since it is molded one by one, even if several molds are lined up and molded at the same time, a large amount cannot be molded.Moreover, there is a lot of loss between processes and the product is not well released. There are many drawbacks such as the work of taking 10 is also laborious, complete automation is difficult, and the cost is high.

[Problems to be solved by the invention]

The present invention eliminates these drawbacks, enables continuous molding, and provides a bearing sealant characterized by obtaining a bearing sealant in large quantities and at low cost, and a method for producing the same.

[Means for solving problems]

The present invention will be described with reference to the drawings. As shown in FIG. 2, the present invention uses a strip-shaped or flat-shaped substrate, vulcanized fiber A (paper made from cotton, hemp, wood pulp, etc. as a raw material) in a zinc chloride solution. Immersion, make the surface sticky, stack several sheets, roll them, stack them, and press bond them to a plate with good mechanical strength, dimensional stability, and heat resistance), A perforating step of forming a predetermined hole 2 for providing a seal lip portion; as shown in FIG. 1, with the hole 2 as a reference, the upper mold C1 and the lower mold C2 vulcanize the base material.
A step of baking or shaping an elastic body B such as synthetic rubber or synthetic resin into a predetermined shape on the fiber A through an adhesive to provide a desired seal lip portion 1; As shown in FIG. 3, it is punched into a desired circular shape by a cutting device 4 such as a punch or a cutter, and as shown in FIG. 4, a process for obtaining a desired bearing sealant D in which a seal lip portion 1 is provided on an inner peripheral portion is combined. The manufacturing method of the bearing sealing material, which is combined, and the vulcanized fiber as the base material are used as a ring-shaped reinforcing core material, and the desired seal is integrally formed on the inner peripheral portion with an elastic body such as synthetic rubber or synthetic resin. The bearing sealing material is characterized in that a lip portion is provided.

As described above, the manufacturing method of the present invention is characterized by a combination of a hole punching process, a seal lip part molding process, and a punching process via the vulcanized fiber of the reinforcing core material. The method is not a limitation of the present invention. That is, in the drilling step, as shown in FIG.
Or it is not particularly limited whether to open continuously. Also,
In the seal lip part molding process, adhesive is applied in advance, but this application method is either a method of passing a vulcanized fiber board between two rollers coated with adhesive, or brushing or spraying the adhesive. There is no particular limitation as long as it is a method that ensures the application by any other known method such as the application by the above method or the method of applying through a liquid tank.
Of course, the method for drying and baking the adhesive is to dry it in an oven or to pass it through a baking device, using an infrared heater or a high-frequency heater, or by blowing hot air to dry and baking it. The above method may be any method as long as the drying and baking are surely performed by a known method, and there is no particular limitation. Further, even in the seal lip portion molding step in which the upper die C1 and the lower die C2 are used for molding, the elastic body B such as synthetic rubber or synthetic resin for forming the seal lip portion 1 is shown in FIG. The material can be supplied into the molds C1 and C2 through the various material supply paths 4, or a fixed amount of pellets and plate-like material can be supplied into the mold, so long as a predetermined amount is supplied in a timely manner. Is not limited. As shown in FIG. 1, unnecessary elastic material is formed as a burr 3 at a position not necessary for constructing the bearing sealing material, and is punched into a desired shape by a cutting device 4 such as a punch or a cutter. Removed along with unnecessary parts.

In addition, as shown in Fig. 5, the vulcanized core material for reinforcement
In the process of drilling holes in the fiber A, at the same time as opening the hole 2 for providing the seal lip portion of the bearing sealant, at a position that does not interfere with obtaining the bearing sealant, preferably at a position near both edges of the vulcanized fiber A. By punching the guide holes 6 for positioning at a constant interval at positions where the hole 2 and the next hole 2 are located at the same position, the feed pitch will be accurate in the case of continuous molding after the next process. Next to
In the case of molding each sheet, the positioning in each step such as molding and punching becomes accurate, and the molding accuracy can be improved.

[Action]

Since the present invention uses a vulcanized fiber for the reinforcing core material, the hole making process is much easier than the conventional method of punching a metal plate and easy to punch, so it can be used with simple equipment. . Also, since the material retains elasticity with a spring effect and is resilient to deformation and can be easily deformed, the work is very smooth, the flow to the next process is good and the work time is shortened. Since there is no concern about deformation (particularly bending) during the process, a continuous molding method is also possible.

Furthermore, since a plate or strip-shaped reinforcing core material is formed with an elastic body having a seal lip portion, it is easy to release from the molds C1 and C2, and the unnecessary parts are attached to the molds C1 and C2. It is particularly advantageous for continuous work since it is not present.

In addition, deburring, which has traditionally been the most troublesome work,
As described above, when the bearing sealing material is punched out by a cutting device such as a punch, it is removed together with the unnecessary reinforcing core material, so the work for deburring is unnecessary and There are no conventional inconveniences such as the bending failure of the core metal and the damage of the seal lip portion, and a good product can be safely and quickly manufactured. Naturally, the vulcanized fiber used in the present invention has heat resistance, and no problem occurs in the heating step (for vulcanization or supply of molten resin) during use.

In addition, the vulcanized fiber is easy and reliable to attach an adhesive, and also adheres well to an elastic body such as synthetic rubber or synthetic resin to ensure reliable adhesion. If necessary, the surface can be easily roughened so that the adhesive strength can be increased easily.

Further, since the bearing sealing material of the present invention uses the vulcanized fiber having elastic strength in the core material portion, it is easily deformed and recovered when the bearing sealing material is fitted into the bearing. Therefore, it is easy to push in, the inconvenience that the metal cored bar is bent and deformed and becomes defective, the fitting work is very easy, and the working time can be shortened.

Further, after molding the elastic body B having the seal lip portion 1 into the vulcanized fiber A and then punching the same, by providing a plurality of protrusions 7 on the outer peripheral portion of the bearing sealing material D as shown in FIG. Can be more easily fitted, and the desired degree of fitting can be freely obtained by changing the shape of the protruding portion 7. Further, by forming an air inlet and outlet (in this case, the protruding portion 7 It is also possible to prevent an increase in internal pressure. The material also has physical strength such as heat resistance, water resistance, chemical resistance, and weather resistance, so it satisfies the conditions that it can withstand use under severe conditions such as bearings.

〔The invention's effect〕

As described above, according to the present invention, the bearing sealing material, which has been very troublesome in the past, can be molded easily, reliably and quickly, and a series of steps from the core material to the molding can be continuously performed. It is also possible to mass-produce, and it also prevents the loss due to the process, the mistake of inserting the core metal, the defect due to improper input, etc., and the time loss is small, which can contribute to the speedup of the molding time. Moreover, the obtained bearing sealing material is
It is an ideal sealing material for bearings and its manufacturing method because it is highly elastic, easy to fit in bearings, has physical strength, and easy to apply to miniature bearings.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a molding step of the bearing sealing material of the present invention. FIG. 2 is a plan view showing a drilling process of the present invention. FIG. 3 is a sectional view showing the punching process of the present invention.
FIG. 4 is a sectional view of the bearing sealing material of the present invention. FIG. 5 is a plan view of a vulcanized fiber according to an embodiment of the present invention. FIG. 6 is a perspective view of a bearing sealing material according to another embodiment of the present invention. FIG. 7 is a sectional view showing a conventional method for manufacturing a bearing sealant. A: Vulcanized fiber, B: Elastic body, C1
…… Upper die, C2 …… Lower die, D …… Bearing sealant 1 …… Seal lip part 2 …… Hole 3 …… Burr 4 ……
Material supply path, 5 ... Cutting device, 6 ... Guide hole, 7 ...
Protrusion

Claims (2)

[Claims] 1. A bearing sealing material comprising a ring-shaped vulcanized fiber as a reinforcing core material, and a seal lip portion made of an elastic body provided on an inner peripheral portion of the reinforcing core material. 2. A step of forming a large number of desired holes in a strip-shaped or flat-plate-shaped vulcanized fiber; and an elastic body such as synthetic rubber or synthetic resin or the like, with an adhesive agent, into the holes based on the predetermined holes. And forming a desired seal lip portion; a step of punching the vulcanized fiber having the seal lip portion into a circular shape to obtain a plurality of sealing materials for bearings; Of manufacturing a sealed bearing sealant.