JP4833003B2 - Method for manufacturing core metal for sealing plate for bearing, core metal, and sealing plate for bearing - Google Patents

Description

  The present invention relates to a method for manufacturing a cored bar for a bearing sealing plate to be mounted on a rolling bearing, a cored bar, and a bearing sealing plate.

  Conventionally, as a sealing plate for a bearing to be mounted on a rolling bearing, a metal core formed by pressing a steel plate with a die into a ring shape (C shape or O shape) has been used. As shown in FIG. 28, the conventional core metal manufacturing method manufactures a ring-shaped core metal 103 by sandwiching a steel plate 102 between an upper mold 101a and a lower mold 101b of a mold and punching it by press working. Yes.

  The steel plate 102 after punching the core metal 103 has end portions 102a and 102b that are discarded as scrap. Therefore, the manufacture of the core metal 103 has a problem that the material cost of the punched scraps after punching by press working is increased and the manufacturing cost is increased. Moreover, since the edge parts 102a and 102b are steel plates, there is also a problem of contaminating the natural environment when discarded as scrap.

  Further, in the above-described manufacturing method, the core metal 103 is manufactured by punching the steel plate 102, and therefore the fiber flow (flow of material fibers) of the core metal 103 becomes uneven on the circumference. For this reason, when the metal core 103 is bent into a desired shape by press processing, the spring back may become non-uniform on the circumference, and the core metal warpage and the dimensional stability of the outer diameter bent part may be deteriorated. Further, when the core metal 103 is covered with a rubber film, for example, and used as a bearing sealing plate, the bearing sealing plate may deteriorate in dimensional accuracy, and may not be fixed at a desired position in the bearing. is there. Therefore, the force (tightening force) that the rubber film of the bearing sealing plate hits the bearing may fluctuate, and the sealing plate for the bearing may not be able to maintain the sealing performance. This causes premature wear of the rubber film and leakage of grease in the bearing, which reduces the life of the bearing. In particular, cores with a narrow design space (cores with a narrow width relative to the diameter) have poor rigidity, and when bent into a desired shape by pressing, the effect of fiber flow is more prominent. It is easy to cause variation in dimensions (warping, bending, height, etc.), and the dimensional accuracy may deteriorate.

  Furthermore, when a high hardness specification is required for the bearing sealing plate, the core bar is processed to further increase the hardness after punching by pressing. For this reason, the man-hours for manufacturing the core metal increase, and the manufacturing cost of the bearing sealing plate increases. In addition, a method is known in which a steel strip having a high hardness is used for the steel plate, and the hardness of the sealing plate for the bearing is increased by punching it out by press working. However, in this method, the punching die has a short life, which increases the cost of the die and increases the manufacturing cost of the bearing sealing plate.

  In order to reduce the amount of steel sheet used, a method of manufacturing a cored bar by cutting a spirally wound steel sheet and welding the cut surface is known (for example, see Patent Document 1 below). This method can reduce the manufacturing cost because the cored bar can be manufactured without producing steel plate scraps. However, since this method wraps around the core on the inner diameter side of the steel sheet, the volume on the outer diameter side of the steel sheet decreases, the radial and thickness dimensions of the core metal become unstable, and the thickness direction Therefore, the sheet steel is bent in the thickness direction, and the thin steel plate cannot be accurately formed into a ring shape. Therefore, the core metal manufactured by this method may deteriorate the dimensional accuracy of the outer diameter portion. Moreover, when the metal core manufactured by this method is covered with, for example, a rubber film and used as a bearing sealing plate, the bearing sealing plate may have poor dimensional accuracy.

  Further, conventionally, a bearing sealing plate (hereinafter referred to as a sealing plate) in which a core metal (hereinafter referred to as an L-shaped core metal) formed by bending an outer diameter portion of a core metal and having a substantially L-shaped cross section is covered with a rubber film. Are known. FIGS. 29A and 29B show how such a sealing plate is press-fitted into the bearing groove. The sealing plate 106 includes an L-shaped cored bar 104 obtained by bending the outer diameter of a cored bar manufactured by a conventional cored bar manufacturing method, and a rubber film 105 that covers the L-shaped cored bar 104. The bearing 110 includes a bearing outer ring 111 and a bearing inner ring 112, and a bearing groove 113 into which the sealing plate 106 is press-fitted is provided between the bearing outer ring 111 and the bearing inner ring 112. Since the core metal is punched from the steel plate by press working, burrs and sagging may occur on the cut surface 104a, and the cut surface 104a may become sharp. Note that the L-shaped cored bar can also be manufactured by simultaneously punching and bending a steel sheet sandwiched between cored molds by pressing with one stroke.

  When the sealing plate 106 is press-fitted into the bearing groove 113 of the bearing 110 and is in a pressure load state, when the cut surface 104a of the L-shaped cored bar 104 becomes sharp, the cut surface 104a is formed between the cut surface 104a and the bearing outer ring 111. The outer diameter lip 105b sandwiched between the end surfaces 111a may be broken. Therefore, when the sealing plate 106 is press-fitted into the bearing groove 113, the sealing plate 106 is displaced from a desired position. Therefore, the inner diameter lip 105a of the rubber film 105 that is in close contact with the bearing inner ring 112 is also displaced from the desired position. The tightening allowance varies, and this changes the tension. When the tightening force decreases, the sealing performance decreases, and dust or the like enters the bearing. Further, when the tightening force is increased, the bearing life is likely to be reduced due to the early wear of the inner lip 105a and the increase in bearing heat generation.

  Moreover, in the molding process of the L-shaped cored bar 104, a method of flattening the cut surface 104a by making the punching and bending processes separate processes is known. However, this method requires a plurality of steps and decreases the productivity, so that the manufacturing cost of the cored bar increases and the manufacturing cost of the bearing sealing plate increases.

  By the way, conventionally, a flat ring making machine for forming a steel sheet having a thickness of 1.5 mm or more into a ring shape is known. 30 (a) (b) (c) and FIG. 31 show a method of forming a ring-shaped steel plate using a flat ring making machine. FIG. 30A shows a state where the tip of the steel plate 126 bent into a ring shape is positioned on the cutting blade 125, and FIG. 30B shows the tip of the steel plate 126 of the guide roll 122 and the core metal roll 123. 30 (c) shows a state in which the steel plate 126 is cut by the cutting blade 125 and the cutting blade 127. FIG. This flat ring making machine extrudes a steel plate 126 from a feed roll (not shown), and the extruded steel plate 126 receives grooves 131 and 141 provided in a guide roll 122 and a core metal roll 123 in the width direction. Then, it is pressed against the bending roll 124 and formed into a ring shape. The steel sheet formed into a ring shape is formed into an O-shape by welding the cut surfaces after being cut by the cutting blade 125 and the cutting blade 127 by the length of one turn. The cutting blade 125 and the cutting blade 127 are movable blades, respectively, but are not limited thereto, and one of them may be a fixed blade.

  In the above forming method, as shown in FIG. 31, the grooves 131 and 141 provided in the guide roll 122 and the cored bar roll 123 only restrain the steel plate 126 in the width direction and not in the thickness direction. . Therefore, since the steel plate formed into a ring shape is deformed in the thickness direction, there is a problem that the dimension in the thickness direction becomes non-uniform and the shape is not stable. For this reason, when the steel plate formed into the ring shape is covered with a rubber film and used as a sealing plate for a bearing, for example, the shape of the sealing plate for the bearing is not stable. It is difficult to fix in the position. As a result, the sealability of the bearing may not be maintained, dust may enter the bearing, the rubber film of the bearing sealing plate will wear quickly, and grease leakage may occur in the bearing, resulting in a shorter bearing life. It tends to decrease.

Even when a steel plate formed into a ring shape is used as a sealing plate for a bearing without being covered with a rubber film, the shape of the sealing plate for a bearing is not stable, so it should be fixed at a desired position in the bearing. Is difficult. For example, when this bearing sealing plate is used as a non-contact type bearing sealing plate (labyrinth seal) in which a minute gap is provided between the bearing and the bearing sealing plate, the bearing sealing plate is placed at a desired position. It is difficult to fix to. Therefore, the gap between the bearing and the bearing sealing plate may fluctuate, and the sealability of the bearing may not be maintained.
Japanese Examined Patent Publication No. 4-52167

  The present invention has been made to solve the above-described problems, and can reduce the manufacturing cost, and can produce a metal core for a sealing plate for a bearing that has good dimensional accuracy and can maintain hermeticity. It is an object to provide a method, a metal core, and a bearing sealing plate.

In order to achieve the above object, the invention of claim 1 is a method of manufacturing a metal core for a bearing sealing plate that is formed into a ring shape by pressing a long steel plate against a bending roll. While extruding in the long direction, press one end of the sheet steel in the width direction against the bending roll, so that the sheet steel is arcuate so that one end in the width direction becomes the outer diameter and the other end in the width direction becomes the inner diameter. A ring processing step of bending the ring, and a forming step of forming a ring-shaped metal core by cutting the thin steel plate curved in an arc shape by the ring processing step. A guide roll that guides one end in the width direction of the thin steel plate, disposed in the passage until the steel plate presses against the bending roll, and a core that opposes this guide roll and corrects the other end in the width direction of the thin steel plate With the gold roll, the thin steel plate is sandwiched from both sides in the width direction, and by inserting the thin steel plate into the grooves provided in each of the guide roll, the core metal roll, and the bending roll, the width direction of the thin steel plate and While correcting the dimensional change in the thickness direction, the thin steel plate is bent, and in the forming step, the opening of the cut thin steel plate is welded by laser welding to form a ring-shaped cored bar. .

According to a second aspect of the present invention, in the method for manufacturing a core for a bearing sealing plate according to the first aspect, after the forming step, the outer diameter portion and / or the inner diameter portion of the ring-shaped core bar are pressed. This further includes a pressing process for forming .

Invention of Claim 3 is the metal core manufactured by the metal core manufacturing method of the sealing plate for bearings as described in any one of Claim 1 or 2.

Invention of Claim 4 is a sealing plate for bearings provided with the ring-shaped metal core manufactured by the manufacturing method of the metal core of the sealing plate for bearings as described in any one of Claim 1 or 2 .

The invention according to claim 5 is a bearing seal formed by covering a ring-shaped cored bar manufactured by the cored bar manufacturing method for a bearing sealing plate according to any one of claims 1 or 2 with an elastic body. It is a board .

  According to the first aspect of the present invention, the ring-shaped cored bar is manufactured by pressing the thin steel plate against the bending roll so as to be bent into an arc shape, and then cutting. Occasionally, punching waste is not generated, the amount of the thin steel plate used as the material of the ring-shaped core metal can be reduced, and the core bar manufacturing cost of the bearing sealing plate can be reduced.

Also, since the thin steel plate is curved in a ring shape so that one end in the width direction of the thin steel plate has an outer diameter and the other end in the width direction has an inner diameter, the fiber flow of the ring-shaped cored bar is in the circumferential direction, Concentric fiber flow is uniform. For this reason, when a ring-shaped metal core is pressed, the deformed state on the circumference becomes uniform, so a metal core for a bearing sealing plate with a high accuracy that stabilizes the metal core warp and the outer diameter bend dimensions can be obtained. Can be manufactured. In addition, since the thin steel plate is bent while correcting the dimensional change in the width direction and the thickness direction of the thin steel plate, the thin steel plate can be bent into a ring shape with high dimensional accuracy. A mandrel can be manufactured.

According to the invention of claim 2, since the outer diameter portion of the ring-shaped cored bar is not a cut surface as in the prior art, the outer diameter portion is not sharp but flat, and even if the outer diameter portion is pressed, The diameter is difficult to sharpen. Therefore, when the ring-shaped metal core whose outer diameter portion is press-processed is used for a bearing sealing plate covered with a rubber film, the metal core can be prevented from breaking the rubber film and the sealing performance can be maintained.

According to the invention of claim 3, the same effect as that of the invention of claim 1 or 2 can be obtained.

According to the invention of claim 4, the same effect as that of the invention of claim 1 or 2 can be obtained.

According to the invention of claim 5, since the outer diameter portion of the ring-shaped cored bar is not a cut surface as in the prior art, even if the ring-shaped cored bar is covered with an elastic body, It is possible to prevent the diameter portion from breaking the rubber film.

(First embodiment)
Hereinafter, a method for manufacturing a metal core for a bearing sealing plate according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. 1, 2, and 3 sequentially show steps until the thin steel plate 6 is extruded and bent into a ring shape (arc shape). The ring-shaped cored bar referred to in this specification includes an O-shaped cored bar and a C-shaped cored bar. In this embodiment, a method for manufacturing an O-shaped cored bar will be described.

  The flat ring making machine 1 extrudes a long steel plate (hereinafter referred to as a thin steel plate) having a thickness of 0.1 to 1.5 mm extruded from a feed roll (not shown) in the longitudinal direction. A wire guide 7 for guiding, a guide roll 2 for guiding one side in the width direction of the thin steel plate 6, a core roll 3 for correcting the other side in the width direction of the thin steel plate 6, and a bending roll 4 against which the thin steel plate 6 is pressed. And a cutting blade 5 for cutting the thin steel plate 6.

  The core metal roll 3 faces the guide roll 2, and the guide roll 2 and the core metal roll 3 sandwich the thin steel plate 6 in the width direction in the passage until the thin steel plate 6 is pressed against the bending roll 4. It is arranged. The guide roll 2, the core metal roll 3, and the bending roll 4 are provided with grooves 21, 31, and 41 through which the thin steel plates 6 are fitted, respectively. The cutting blade 5 and the cutting blade 5a are cut by sandwiching the thin steel plate 6. In FIG. 1B, the groove depth dimension x of the grooves 21, 31, 41 is the dimension of the pressing amount in the thickness direction of the thin steel plate 6. As the material of the thin steel plate 6, for example, SECC, SECC-P, SPCC, SK5, SUS430, SUS304, SPTFS, or the like is used. Note that the guide roll 2 and the core metal roll 3 may be arranged in any number in the passage of the thin steel plate 6. Moreover, the bending roll 4 may be arrange | positioned by arbitrary numbers in the arbitrary positions where the thin steel plate 6 presses. Further, the cutting blade 5 and the cutting blade 5a are movable blades, respectively, but are not limited thereto, and one of them may be a fixed blade.

  As shown in FIGS. 1 and 4A, the thin steel plate 6 is sandwiched from both sides in the width direction by the guide roll 2 and the cored bar roll 3 when pushed out from the feed roll in the longitudinal direction, and the groove 21, 31 and 41 are inserted, one end in the width direction of the thin steel plate 6 presses against the bending roll 4, and one end in the width direction of the thin steel plate 6 becomes the outer diameter 6b, and the other end in the width direction is bent into a ring shape having the inner diameter 6c. . At this time, since the thin steel plate 6 is sandwiched by the guide roll 2 and the core metal roll 3 from both sides in the width direction, the dimensional change in the width direction is corrected. Further, since the thin steel plate 6 is inserted into the grooves 21, 31, 41, the dimensional change in the thickness direction is corrected. Further, when the thin steel plate 6 is pushed out from the feed roll, the tip 6a of the thin steel plate 6 passes between the guide roll 2 and the core metal roll 3 as shown in FIG. 2 and FIG. 4 (b). .

  Further, when the thin steel plate 6 is pushed out, as shown in FIG. 3 and FIG. 4C, the front end portion 6 a of the thin steel plate 6 goes around the cutting blade 5. At this time, the cutting blade 5 and the cutting blade 5a cut the thin steel plate 6 to form a ring-shaped thin steel plate 8 as shown in FIG. By welding the cut surface 8a of the ring-shaped thin steel plate 8, the cored bar 9 shown in FIG. 6 is manufactured. As a specific example, when the groove height dimension of the grooves 21, 31, 41 is 0.4 mm and the groove depth dimension x is 2 mm, the flat ring making machine 1 has a width W of the thin steel plate 6 of 5 mm, A thin steel plate 6 having a thickness t of 0.4 mm was supplied, and a metal core 9 having a diameter ΦD of 30 mm of the thin steel plate 6 formed into a ring shape was manufactured. In addition, when the cut surface 8a of the thin steel plate 8 is welded by mash seam welding or butt welding, an excessive portion may be formed in the width direction and the thickness direction of the cut surface 8a. Sometimes it has to be removed by doing. On the other hand, when the cut surface 8a of the thin steel plate 8 is welded by laser welding, it can be melted and welded without changing the dimensions of the cut surface 8a, so that there are excess portions in the width direction and the thickness direction of the cut surface 8a. There is nothing you can do. Therefore, processing such as polishing and pressing after welding is not necessary, and the manufacturing cost of the cored bar 9 can be reduced. Therefore, laser welding is preferable for welding the cut surface 8a.

  In the manufacturing method described above, punching scraps of the thin steel plate 6 are not produced at the time of manufacturing as in the conventional method, so that the amount of the thin steel plate 6 used as a material can be reduced as compared with the conventional manufacturing method. Therefore, the manufacturing cost of the cored bar 9 can be reduced, and the manufacturing cost of the bearing sealing plate using the cored bar 9 can be reduced. In addition, compared with the conventional manufacturing cost, the manufacturing cost of the sealing plate for bearings which uses the core metal 9 and the core metal 9 as the steel plate with high material cost, for example, SUS material, copper, etc., is used as the thin steel plate 6. It can be greatly reduced.

  Further, by pressing one end in the width direction of the thin steel plate 6 against the bending roll 4, the thin steel plate 6 is ring-shaped so that one end in the width direction of the thin steel plate 6 has an outer diameter 6b and the other end in the width direction has an inner diameter 6c. The metal core 9 is manufactured by curving into a shape, cutting, and welding. Therefore, the fiber flow of the cored bar 9 is in the circumferential direction, and the fiber flow on the concentric circle is uniform. Therefore, even when the core bar 9 is pressed, the circumferential deformation state is uniform, so that the dimensional accuracy of the core bar warp and the outer diameter bend is stable, and the bearing sealing plate is accurate. A cored bar can be manufactured, and the sealing plate for bearings using the cored bar 9 can maintain sealing performance. Further, even when a thin steel plate 6 having a low strength such as a narrow width is used as a material, the same effect as described above can be obtained. The accuracy of the dimensions (warp, bend, height, etc.) is stable.

  The extruded thin steel plate 6 is sandwiched between the guide roll 2 and the core metal roll 3 from both sides in the width direction, and the grooves 21, 31, 41 are inserted to correct the dimensional change in the width direction and the thickness direction. Then, it is pressed against the bending roll 4 and bent into a ring shape. Therefore, since the thin steel plate 6 is curved into a ring shape while correcting the bending in the width direction and the thickness direction, the cored bar 9 with good dimensional accuracy can be manufactured. In the above manufacturing method, the diameter size of the cored bar 9 to be manufactured is determined by the moving amount of the bending roll 4. Therefore, when manufacturing the cored bar 9 with the same cored bar width and different diameter sizes, the guide roll 2, the cored bar roll 3 and the bending roll 4 can be reused, and the manufacturing cost of the cored bar 9 can be reduced. While being able to reduce, the manufacturing cost of the sealing plate for bearings which uses the metal core 9 can be reduced.

Moreover, in order to process into the ring shape, correcting the dimensional change of the thin steel plate 6 in the width direction and the thickness direction, the pressing amount x for correcting the thickness direction of the thin steel plate 6 must be considered. Therefore, the relationship between the pressing amount x and the thickness t and width W of the thin steel plate 6 is preferably in the range of t ≦ x <0.5W. Moreover, the dimension of the groove height of the grooves 21, 31, 41 is substantially equal to the thickness t. Moreover, the processing range of the thin steel plate 6 in the manufacturing method satisfies the following conditional expressions (1), (2), and (3), respectively. These conditions are not limited to the case where the O-shaped cored bar 9 is manufactured, but are satisfied even when a ring-shaped cored bar such as a C-shaped core is manufactured. The thickness t is preferably 0.1 to 0.6 mm.
(1) ΦD / W = 4.0 to 20.0
(2) W / t = 1.0-23.0
(3) t = 0.1 to 1.5 (unit: mm)

  Further, when manufacturing a cored bar 9 having a large curvature, a wide width dimension, and a high precision in thickness dimension, when the sheet steel plate 6 is supplied to the flat ring making machine 1 and bent into a ring shape, the sheet steel plate 6 may be stretched to reduce the thickness, and the inner diameter portion of the thin steel plate 6 may be compressed to increase the thickness. Therefore, by using the thin steel plate 6 in which the amount of change in the thickness of the inner diameter portion and the outer diameter portion is anticipated, that is, the thin steel plate 6 having a thick outer diameter portion, a thin inner diameter portion, and a trapezoidal cross section, the thickness is increased. A uniform core metal 9 with good dimensional accuracy can be manufactured. Specifically, a thin steel plate 6 having an outer diameter of 0.43 mm, an inner diameter of 0.37 mm, and W of 5.0 mm is supplied to the flat ring making machine 1, and ΦD is 30 mm and W is 5 A uniform cored bar 9 having a thickness of 0.0 mm and t of 0.4 mm was manufactured.

  Next, a modified example in which processing is further performed based on the cored bar 9 manufactured by the above-described manufacturing method will be described with reference to FIGS. As shown in FIG. 7, the cored bar 10 is formed in a burial shape by bending the inner diameter portion 10 a by press working and then punching by press working. Therefore, the outer diameter part of the cored bar 10 is not processed and is not a cut surface, so it is not sharp but flat. As shown in FIG. 8, the core metal 11 is formed into a substantially L-shaped cross section by bending the outer diameter portion 11a by press working. However, since the outer diameter portion 11a is not a cut surface, it is not sharp but flat. As shown in FIG. 9, the cored bar 12 is formed in a burial shape by bending the inner diameter portion 12b by press working and then punching it by press working. The outer diameter portion 12a is formed into a substantially L-shaped cross section by being bent by press working. For this reason, the inner diameter portion 12b is sharp because it is a cut surface, but the outer diameter portion 12a is not sharp but flat because it is not a cut surface. Further, since each of the core bars 10, 11, and 12 is formed into a ring shape by pressing a thin steel plate against a bending roll, punching is performed by pressing using a conventional core metal mold. Absent. Accordingly, the outer diameter portions of the respective core bars 10, 11 and 12 are not punched by press working, and are not cut surfaces and are not sharp but flat. It is hard to become a sharp shape.

  Further, even when the cored bar 9 is pressed or pulled, the outer diameter part of the molded cored bar is not sharp but flat, even when it is molded other than the shape of the cored bar 10, 11, 12 Unless the outer diameter portion is punched by press working or the like, there is almost no sharp shape. In addition, when a core metal is formed in which the shape of the outer diameter portion and the inner diameter portion of each core metal 10, 11, 12 is reversed, the inner diameter portion of this core metal is not punched by press work. Since the inner diameter portion is not a cut surface, the inner diameter portion is not sharp but flat, and even when bent by pressing, it is difficult to form a sharp shape. Therefore, the same effect as described above can be obtained except that the flat end surface becomes the inner diameter portion. Each core metal 10, 11, and 12 can also be manufactured by sandwiching the above-described core metal 9 in a mold and simultaneously performing punching and bending by pressing by one stroke.

  Next, a bearing sealing plate using the cored bar manufactured by the manufacturing method described above will be described with reference to FIGS. 10 to 13. As shown in FIG. 10, the bearing sealing plate 97 is obtained by covering the core metal 9 with a rubber film 13 (elastic body). As shown in FIG. 11, the bearing sealing plate 98 is obtained by covering the cored bar 10 with a rubber film 14. As shown in FIG. 12, the bearing sealing plate 90 is obtained by covering the core metal 11 with a rubber film 15. As shown in FIG. 13, the bearing sealing plate 99 is formed by covering the cored bar 12 with a rubber film 16.

  Next, a state in which the bearing sealing plate 90 is press-fitted into the bearing will be described with reference to FIGS. 14 and 15. As shown in FIG. 14A, the bearing 50 includes a bearing outer ring 51 and a bearing inner ring 52, and a bearing groove 53 into which a bearing sealing plate 90 is press-fitted is provided between the bearing outer ring 51 and the bearing inner ring 52. Is provided. The bearing 50 is filled with grease (not shown) as a lubricant.

  When the bearing sealing plate 90 is press-fitted into the bearing groove 53 by pressing with a machine or the like, the outer diameter lip 15a of the rubber film 15 is inserted into the bearing groove 53 in the bearing sealing plate 90 as shown in FIG. The bearing 50 is sealed by being fitted and the inner diameter lip 15 b of the rubber film 15 being in close contact with the bearing inner ring 52. At this time, in the bearing sealing plate 90, the outer diameter portion 11a of the core metal 11 is hardly sharpened as compared with the conventional bearing sealing plate. Therefore, as shown in FIG. 15, the outer diameter portion 11 a of the core metal 11 hardly breaks the rubber film portion 15 c sandwiched between the end surface 51 a of the bearing outer ring 51 and the outer diameter portion 11 a of the core metal 11. . Further, when the bearing sealing plate 90 is press-fitted into the bearing groove 53, the bearing sealing plate 90 can be fixed at a desired position, so that the inner diameter lip 15b of the rubber film 15 in close contact with the bearing inner ring 52 is also at a desired position. Since there is no fluctuation in the tightening allowance of the inner diameter lip 15b, there is no fluctuation in tension. Therefore, even when the bearing sealing plate 90 is used in a pressure load state such as press-fitting into the bearing groove 53, the outer diameter portion 11a of the core metal 11 hardly breaks the rubber film portion 15c. The sealing performance of the sealing plate 90 can be maintained, dust and the like can be prevented from entering the bearing 50, and leakage of grease inside the bearing 50 can be prevented.

  Although an example in which the bearing sealing plate 90 is press-fitted into the bearing groove 53 of the bearing 50 has been shown, the present invention is not limited thereto, and the bearing sealing plates 97, 98, 99 are press-fitted into the bearing groove 53 of the bearing 50. Even so, since the outer diameter portions of the cores 9, 10, 12 used for the bearing sealing plates 97, 98, 99 are not sharp, the rubber films 13, 14, 16 are not broken. Sealability can be maintained. Therefore, dust and the like can be prevented from entering the bearing 50, and leakage of grease inside the bearing 50 can be prevented.

  Next, a further modification of the bearing sealing plate using the core bar manufactured by the above-described manufacturing method will be described with reference to FIGS. 16 to 18. As shown in FIG. 16, the bearing sealing plate 91 is composed of a cored bar 9 and an O-shaped rubber piece 71, and presses the cored bar 9 and the rubber piece 71 into the bearing groove 53 in order, thereby Is pressed into the bearing groove 53 by the elastic force of the rubber piece 71 and fixed. Since the core metal 9 has a stable outer diameter end face dimension, there is almost no variation in the minute gap between the inner diameter part of the core metal 9 and the outer diameter surface of the bearing inner ring 52, so that stable sealing performance is maintained. Can do. As shown in FIG. 17, the bearing sealing plate 92 includes a cored bar 9 and a rubber piece 72. By pressing the rubber piece 72 and the cored bar 9 into the bearing groove 53 in order, the elastic force of the rubber piece 72 is used. The metal core 9 is pressed and fixed in the recess 53 a of the bearing groove 53. Since the core 9 has a stable outer diameter end face dimension, the same effect as described above can be obtained and a stable sealing performance can be maintained. As shown in FIG. 18, the bearing sealing plate 93 includes a cored bar 10 and a rubber piece 73. By pressing the rubber piece 73 and the cored bar 10 into the bearing groove 53 in order, the elastic force of the rubber piece 73 is used. The cored bar 10 is pressed and fixed in the recess 53 a of the bearing groove 53. Moreover, since the dimension of the end surface of an outer diameter part is stable, the core metal 10 can acquire the effect similar to the above, and can maintain the stable sealing performance. Therefore, when the bearing sealing plates 91, 92, 93 are press-fitted into the bearing groove 53, dust and the like can be prevented from entering the bearing 50 and leakage of grease inside the bearing 50 can be prevented. Instead of the rubber pieces 71, 72, 73, a retaining ring having an elastic force may be used.

  Next, a further modification of the bearing sealing plate using the core bar manufactured by the manufacturing method described above will be described with reference to FIGS. 19 to 22. The bearing sealing plate 94 is composed of a core metal 11 as shown in FIG. Since the core metal 11 is fitted into the bearing groove 53, the outer diameter portion of the core metal 11 is in close contact with the bearing outer ring 51, and the inner diameter portion faces the bearing inner ring 52 with a minute gap to form a labyrinth seal. Sealability can be maintained. As shown in FIG. 20, the bearing sealing plate 95 is composed of a core metal 12. Since the core metal 12 is fitted into the bearing groove 53, the outer diameter portion of the core metal 12 is in close contact with the bearing outer ring 51, and the inner diameter portion faces the bearing inner ring 52 with a minute gap to form a labyrinth seal. Sealability can be maintained.

  As shown in FIG. 21, the bearing sealing plate 96 is composed of a core bar 17 having a substantially L-shaped cross section. FIG. 22 shows a state in which the metal core 17 is press-fitted into the bearing groove 53, a state before the metal core 17b indicated by a dotted line is press-fitted into the bearing groove 53, and a metal core 17a indicated by a solid line is the bearing. The state after press-fitting into the groove 53 is shown. As shown in FIG. 22, the core metal 17 is press-fitted into the bearing groove 53 while pressing the outer diameter portion of the core metal 17 against the bearing outer ring 51, so that the outer diameter portion of the core metal 17 is directed toward the bearing inner ring 52. The bent portion 17c of the cored bar 17 is expanded with the bending. Therefore, the outer diameter portion of the core metal 17 is in close contact with the bearing outer ring 51, and the inner diameter portion of the core metal 17 is opposed to the bearing inner ring 52 with a minute gap to form a labyrinth seal, so that the sealing performance can be maintained. . Therefore, when the bearing sealing plates 94, 95, and 96 are fitted in the bearing grooves 53, dust and the like can be prevented from entering the bearing 50, and leakage of grease inside the bearing 50 can be prevented.

  Even when the bearing sealing plates 90 to 99 are used as non-contact type bearing sealing plates (labyrinth seals), the eccentricity of the cores constituting the bearing sealing plates 90 to 99 is suppressed. Therefore, the dimension of the minute gap between the inner diameter portion of the bearing sealing plates 90 to 99 and the bearing inner ring 52 is stabilized. Further, since the outer diameter portion of the cored bar of the bearing sealing plates 90 to 99 is not sharp, the rubber film or the rubber piece covering the cored bar is hardly broken. Therefore, the sealing plates 90 to 99 for bearings can maintain the sealing performance of the bearings.

(Second Embodiment)
Next, a method for manufacturing a metal core for a bearing sealing plate according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, a case where a C-shaped cored bar is used as a ring-shaped cored bar will be described. As shown in FIG. 23, the cored bar 81 is manufactured by not welding the cut surface of the ring-shaped thin steel plate 8 in the cored bar manufacturing method shown in the first embodiment. The same effect as the cored bar 9 shown in the embodiment can be obtained.

  As shown in FIG. 24, the cored bar 82 is formed in a burial shape by bending the inner diameter part 82a by press working and then punching it by press working. As shown in FIG. 25, the metal core 83 is formed in a substantially L-shaped cross section by bending the outer diameter portion 83a by press working. As shown in FIG. 26, the cored bar 84 is formed by bending the outer diameter portion 84a by press working, thereby forming the outer diameter portion 84a into a substantially L-shaped cross section, and further bending the inner diameter portion 84b by pressing. By punching by processing, the inner diameter portion 84b is formed into a burr shape. Since each of the core bars 82, 83, and 84 is formed into a ring shape by pressing a thin steel plate against a bending roll, punching is not performed by pressing using a conventional mold. Moreover, none of the outer diameter portions of the core bars 82, 83, and 84 is punched by press working. Accordingly, the outer diameter portion of each of the core bars 82, 83, and 84 is not a cut surface, but is not sharp but flat, and even when bent by press working, it is difficult to have a sharp shape.

  Even when the cored bar 81 is pressed or pulled, the outer diameter part of the molded cored bar is not sharp but flat, even when it is molded in a shape other than those shown in the cored bars 82, 83, 84. For this reason, unless the outer diameter portion is punched by press working or the like, it is difficult to form a sharp shape. Moreover, when the core metal whose outer diameter part shape and the inner diameter part shape of each of the core bars 82, 83, 84 are reversed is formed, the inner diameter part of the molded core bar is not punched by press working. Therefore, since the inner diameter portion is not a cut surface, it is not sharp but flat, and even when bent by press working, it is difficult to form a sharp shape. Therefore, the same effect as described above can be obtained except that the flat end surface becomes the inner diameter portion. In addition, each cored bar 82, 83, 84 can also be manufactured by sandwiching the cored bar 81 manufactured by the above manufacturing method into a cored metal mold, and simultaneously performing punching and bending by pressing by one stroke. .

  Moreover, although the metal cores 81-84 manufactured by the manufacturing method mentioned above showed what does not weld a cut surface, it is not restricted to this, For example, as shown in FIG. 27, a part 85a of a cut surface is welded. The cored bar 85 may be used. Further, the core bars 81 to 85 may be used as core bars constituting the bearing sealing plates 90 to 99.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, a steel plate (thin steel plate) having a thickness of 0.1 to 1.5 mm is used as a material. However, the present invention is not limited thereto, and a hard steel plate having a thickness of 0.1 to 1.5 mm is used. It may be used as a material. In this case, since it is not necessary to perform the process of increasing the hardness after punching the core metal as in the prior art, it is possible to reduce the man-hours for manufacturing the hard steel core metal. Further, since the hard steel is not punched as in the prior art, the life of the punching die is not shortened and the cost of the punching die is not required. Therefore, the manufacturing cost of the hard steel cored bar can be reduced, and the manufacturing cost of the bearing sealing plate using the hard steel cored bar can be reduced.

  Moreover, although the metal core 11 formed into a substantially L-shaped cross section by bending the outer diameter portion by press working is shown, the present invention is not limited to this. For example, the flat ring making machine 1 has a desired shape in advance. For example, by using a thin steel plate having a substantially L-shaped cross section as a material, forming this thin steel plate into a ring shape, cutting it, and then welding the cut surface to produce a core bar having a substantially L-shaped cross section. May be. In this case, since it is not necessary to bend the outer diameter part of the manufactured core metal by pressing, the manufacturing cost of the core metal having a substantially L-shaped cross section can be reduced, and for the bearing using this core metal The manufacturing cost of the sealing plate can be reduced.

(A) is the inclination figure of the bending process part of the flat ring making machine which concerns on the 1st Embodiment of this invention, (b) is the sectional view on the AA 'line of (a). (A) is the inclination figure of the bending process part of the said flat ring making machine, (b) is the BB 'sectional view taken on the line of (a). The inclination figure of the bending process part when the thin steel plate of the said flat ring making machine rolls. (A) (b) (c) is a figure which shows the manufacturing process of the ring by the said flat ring making machine, respectively. The external view before welding of the metal core manufactured with the said flat ring making machine. (A) is the external view after welding of the O-shaped cored bar manufactured with the said flat ring making machine, (b) is CC 'sectional view taken on the line of (a). (A) is the external view which pressed the inner diameter side of the said metal core, (b) is DD 'sectional view taken on the line of (a). (A) is the external view which pressed the outer-diameter side of the said metal core, (b) is the EE 'sectional view taken on the line of (a). (A) is the external view which pressed the outer-diameter side and inner-diameter side of the said metal core, (b) is FF 'sectional view taken on the line of (a). Sectional drawing equivalent to the CC 'line cross section of FIG. 6 of the sealing plate for bearings which covered the metal core shown in FIG. 6 with the rubber film. Sectional drawing equivalent to the DD 'line cross section of FIG. 7 of the sealing plate for bearings which covered the metal core shown in FIG. 7 with the rubber film. Sectional drawing equivalent to the EE 'line cross section of FIG. 8 of the sealing plate for bearings which covered the metal core shown in FIG. 8 with the rubber film. Sectional drawing equivalent to the FF 'line cross section of FIG. 9 of the sealing plate for bearings which covered the metal core shown in FIG. 9 with the rubber film. (A) is sectional drawing before press-fitting the sealing plate for bearings shown in FIG. 12 in a bearing groove, (b) is sectional drawing after press-fitting the sealing plate in a bearing groove. Sectional drawing which shows the state after press-fitting of the said sealing board. Sectional drawing after press-fitting the metal core shown in FIG. 6 in a bearing groove as a sealing plate for bearings. Sectional drawing which shows the further modification after pressing the said sealing plate in a bearing groove. Sectional drawing after pressing the core metal shown in FIG. 7 into a bearing groove as a sealing plate for bearings. FIG. 9 is a cross-sectional view after the cored bar shown in FIG. 8 is press-fitted into a bearing groove as a bearing sealing plate. FIG. 10 is a cross-sectional view after the cored bar shown in FIG. 9 is press-fitted into a bearing groove as a bearing sealing plate. Sectional drawing which shows the further modification after pressing the said sealing plate in a bearing groove. Sectional drawing which shows the detail of the change of the said sealing board at the time of press-fitting the said sealing board in a bearing groove. (A) is an external view of the C-shaped cored bar which concerns on the 2nd Embodiment of this invention, (b) is the GG 'sectional view taken on the line of (a). (A) is the external view which pressed the inner diameter side of the said metal core, (b) is the HH 'sectional view taken on the line of (a). (A) is the external view which pressed the outer-diameter side of the said metal core, (b) is the II 'sectional view taken on the line of (a). (A) is the external view which pressed the outer-diameter side and inner-diameter side of the said metal core, (b) is the JJ 'sectional view taken on the line of (a). The external view after welding a part of opening part of the said metal core. The figure which shows the manufacturing process of the conventional metal core. (A) is sectional drawing before press-fitting the sealing plate for bearings which covered the conventional metal core with the rubber film in a bearing groove, (b) is sectional drawing after crimping the sealing plate to a bearing groove. (A) (b) (c) is a figure which shows the manufacturing process of the ring by the conventional flat ring making machine, respectively. KK 'sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat ring making machine 2 Guide roll 3 Core metal roll 4 Bending roll 5 Cutting blade 6 Sheet steel 7 Wire guide 8 Ring-shaped sheet steel 9 O-shaped core (ring-shaped core)
21 groove 31 groove 41 groove 81 C-shaped cored bar (ring-shaped cored bar)

Claims (5)

A method of manufacturing a metal core of a sealing plate for a bearing formed into a ring shape by pressing a long steel plate against a bending roll,
While extruding the thin steel plate in the longitudinal direction, the one end in the width direction of the thin steel plate is pressed against the bending roll, so that one end in the width direction of the thin steel plate becomes the outer diameter and the other end in the width direction becomes the inner diameter. A ring processing step for bending the
Forming the ring-shaped cored bar by cutting the thin steel plate curved in an arc shape by the ring processing step ,
In the ring processing step, a guide roll that is disposed in a passage until the thin steel plate is pressed against the bending roll, guides one end in the width direction of the thin steel plate, and faces the guide roll in the width direction of the thin steel plate. By sandwiching the thin steel plate from both sides in the width direction with the core metal roll that corrects the other end side, by inserting the thin steel plate into the grooves provided in each of the guide roll, the core metal roll, and the bending roll, While correcting the dimensional change in the width direction and the thickness direction of the thin steel plate, bending the thin steel plate,
The method for producing a core metal for a sealing plate for a bearing according to claim 1, wherein, in the forming step, a ring-shaped metal core is formed by welding an opening of the cut sheet steel plate by laser welding . The bearing sealing according to claim 1, further comprising a pressing step of pressing the outer diameter portion and / or the inner diameter portion of the ring-shaped cored bar after the forming step. A method for manufacturing a metal core of a plate. A cored bar manufactured by the cored bar manufacturing method for a bearing sealing plate according to claim 1 . A bearing sealing plate comprising a ring-shaped cored bar manufactured by the method for manufacturing a cored bar for a bearing sealing plate according to claim 1 . A ring-shaped cored bar manufactured by the method for manufacturing a cored bar for a bearing sealing plate according to claim 1 or 2 is covered with an elastic body .

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