JPH0444124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method that allows continuous mass production of bearing sealants.

Conventionally, as shown in Fig. 1, the method for manufacturing a bearing sealant is to place a reinforcing material core 3 in a lower mold 2 in a mold for molding a bearing sealant, and to supply synthetic rubber 4 on top of this. After the upper mold 1 was closed and the rubber was vulcanized by heating for a certain period of time, it was taken out from the molds 1 and 2 and the burrs were removed to obtain the desired bearing sealing material.

For this reason, the molding process of the core metal and the molding process of the sealant are made in separate processes, so there is a risk of defective products due to inserting the wrong core metal or forgetting to insert it.Furthermore, since each core metal is molded one by one, the mold Even if several pieces are lined up and molded at once, it is not possible to mold a large quantity continuously, resulting in high costs, and there are also drawbacks such as a large amount of loss between processes.

The present invention eliminates these drawbacks and provides a method for manufacturing a bearing sealing material that enables continuous mass production.

To explain the present invention based on the drawings, as shown in FIG. This is a manufacturing method for obtaining a sealing material, and the drawing shows the process flowing from left to right. First, a hole-drilling step A in which a belt-shaped core metal plate 5 is supplied onto the line, and a desired hole 6 such as a center hole of a bearing sealing material is continuously punched in the belt-shaped core metal plate 5; For example, an adhesive for adhering synthetic rubber to the metal core plate 5 is applied to the core metal plate 5 using an adhesive application roller 7, and then dried in an oven or the like and passed through a baking machine 8. Adhesive application step B in which drying and baking are performed; an elastic body 11 made of synthetic rubber or synthetic resin is inserted into the supply channel 9 with reference to the hole 6 provided in the metal core plate 5 coated with adhesive;
etc., and as shown in Fig. 3, the upper mold 10a
and a seal part forming step C in which desired seal parts 11a, 11b are formed by baking or shaping into a desired shape with a lower mold 10b; seal parts 11a,
As shown in FIG. 4, the core metal plate 5 having the seal portions 11a and 11b formed thereon was punched into a desired shape with a punch 13 and punched out in a punching step D1 in which burrs were also punched out at the same time. This is a method for manufacturing a bearing sealing material in which a bearing sealing material E having a desired shape is obtained by continuously combining the bending step D2 of bending the core metal plate 5a at a desired location.

As described above, the manufacturing method of the present invention includes a hole-drilling step A, an adhesive application step B,
Seal part molding process C, punching and bending process D
The present invention is characterized by a continuous combination of steps 1 and D2, and the method of action performed in the same steps does not limit the present invention. That is, in the adhesive application method, as shown in FIG. 2, the adhesive is supplied to the plate 14, and the metal core plate 5 is passed between the two rollers 7 that are in contact with the tray 14 and the adhesive has been transferred.
However, in addition to this method, any known method that ensures reliable application, such as spraying or passing through a liquid tank, may be used. I don't. The applied adhesive can be dried and baked in an oven as shown in the figure, by passing it through the baking machine 8 using an infrared heater or high-frequency heater, or by blowing hot air. There are no particular limitations on the method of baking, and any known method may be used as long as drying and baking can be performed reliably. Furthermore, the upper mold 10a and the lower mold 1
In the seal part molding process C in which the seal part is molded using 0b, an elastic body 11 made of synthetic rubber or synthetic resin for forming the seal part is introduced into the mold through the material supply channel 9 as shown in FIG. The supply method is not limited as long as a predetermined amount is supplied in a timely manner, such as by supplying pellets or by supplying a fixed amount of pellets into a mold.

Also, the punching and bending steps D1 and D2 are performed in the order of the punching step D1 and then the bending step D2, or
A bending device may be attached to the punch 13 to perform the punching step D1 and the bending step D2 at the same time. In this way, the desired bearing sealing material E is obtained through a series of steps, but the belt-shaped metal core plate 5 after being punched out is automatically wound up and discarded at the final stage of the process.

Note that even if the order of the hole-drilling step A and the adhesive application step B in the manufacturing process is reversed, the configuration of the manufacturing method of the present invention will not change.

According to the manufacturing method of the bearing sealing material of the present invention as described above, the manufacturing process is continuous, so that there is no loss between processes and the molding can be performed continuously. The metal plate 5 for core metal is heated and moved to the next molding process C, so when molding the seal parts 11a and 11b, the heat of the heated metal plate 5 for core metal is used during vulcanization of synthetic rubber etc. Since it can be used, the vulcanization time can be significantly shortened.
In addition, by replacing the punch 16 for punching in process A, the upper and lower molds in process C, and the punch and bending jig in processes D1 and D2, it is easy to continuously produce a large amount of the desired bearing sealing material. You can get it. At this time, material loss can be minimized by changing the feeding pitch of the core metal plate 5 in accordance with the size of the bearing sealing material.

Further, in order to increase the molding speed and improve productivity, it is necessary to shorten the molding time in molding process C or shorten the feeding time. To shorten the molding time, use synthetic rubber with a short vulcanization time and use the heat used for heating in the previous step, but since there is a limit to this, the molding mold for molding process C is used. A large number of reinforcing metal plates 5 are prepared and moved in a rotary manner sequentially and continuously until molding is performed for a certain period of time,
After the molding is completed, the speed can be greatly increased by rotating the molding member away from the reinforcing metal plate 5 on the opposite side and returning to the front of the molding position. Of course, in this case as well, the heat from the previous process is utilized.

As shown in FIG. 6, in the hole-drilling process of continuously making holes in the metal core plate 5, at the same time as opening the center hole 6a for the bearing sealant, a Small holes 6b for positioning are punched out at regular intervals, preferably at positions close to both edges of the metal plate 5 for the core metal, and at positions equidistant from the center hole 6a and the next center hole 6a. If this is done, the feed pitch will be accurate in the next process and subsequent steps, and the positioning during each process of molding, punching, and bending will be accurate, and molding accuracy can be improved.

In addition, as shown in FIG. 7, in the hole-drilling step A in which holes are continuously made in the metal core plate 5, when the center hole 6a for the bearing sealing material is drilled, it becomes the outer periphery of the seal and is bent. By punching out multiple radial slits 15 at the same time in the bending step D2, the bending process D2 is easy.
As shown in Fig. 8, the outer circumference of the bearing sealing material E is not bent on the same circumference, but the seal portion 11b is bent in an uneven manner, that is, in a relationship that is not on the same circumference. In addition to controlling the fitting force to the bearing, it is also possible to release the air at the short diameter concave part of the seal part 11b to avoid the inconvenience caused by the expansion of air due to the rotational heat of the bearing. You can easily control the degree. Furthermore, as shown in Figure 8, the slit 15
The control of the air can be further facilitated by providing an appropriate number of pieces extending further than the bending dimension so as not to reach the seal portion 11a provided in the center hole 6a. In this case, the outer peripheral seal portion 11b may have the same effect even if it is bent on the same circumference instead of being uneven.

As described above, according to the present invention, in the production of bearing sealing materials, a series of processes from core metal to molding are performed continuously and without interruption, so there is no loss between processes, there is no mis-insertion of core metal, This is an ideal manufacturing method that can prevent defects, eliminate time loss, increase molding time, and enable mass production.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional method of manufacturing a bearing sealant. FIG. 2 is a manufacturing process diagram showing the method for manufacturing the bearing sealing material of the present invention. FIG. 3 is a sectional view of the molding step C of the present invention. FIG. 4 is a sectional view of the punching step D1 of the present invention. FIG. 5 is a sectional view of the bending step D2 of the present invention. FIG. 6 is a plan view of a metal plate for a core metal according to an embodiment of the present invention.
FIG. 7 is a plan view of a metal plate for a core metal according to another embodiment of the present invention. FIG. 8 is a plan view of a bearing sealing material according to another embodiment of the present invention. A... Hole drilling process, B... Adhesive application process, C
... Molding process, D1... Punching process, D2... Bending process, E... Bearing sealing material, 5... Metal plate for core metal, 6... Hole, 7... Adhesive application roller, 8
...Drying, baking machine, 10...Molding mold, 11...
Elastic body, 13... punch.

Claims (1)

[Claims] 1. A method for manufacturing a sealing material for a bearing, which includes the steps of continuously drilling internal holes, radial slits, etc. in a strip-shaped metal plate for a core metal; after applying an adhesive to the metal plate for a core metal; A step of drying and baking; supplying an elastic body such as synthetic rubber or synthetic resin with reference to the hole in the metal plate for the core bar coated with adhesive, and baking or shaping it with upper and lower molds. A step of forming an inner peripheral seal portion and an outer peripheral seal portion; punching out the core metal plate on which the inner and outer peripheral seal portions are formed into a shape of a sealant, and folding an outer peripheral portion having a slit shaped like the sealant. A method for producing a sealing material for a bearing, characterized by continuously combining a step of bending to obtain a sealing material for a bearing.