JP4978318B2 - Method for manufacturing shell needle bearing with seal ring - Google Patents

Description

The present invention relates to a method for manufacturing a shell-type needle bearing with a seal ring.

  Conventionally, many slide bearings (bushes) are used in automatic transmissions, but shell type needle bearings are being substituted for measures against seizure of bushes and lower torque.

  Shell-type needle bearings include those with a reduced profile with a bearing cross-section height of 1.5 to 2.5 mm, and those with a seal ring so that the amount of lubricant penetrating oil is the same level as the bush. It is known (for example, see Patent Documents 1 to 3).

  Specifically, the shell-type needle bearing 100 shown in FIG. 21 includes a shell (ringed outer ring) 101, a cage 102, and a plurality of needles 103, and has a bearing cross-sectional height of about 1.5 mm and 17 to 33 mm. It has a shaft diameter. 22 includes a seal ring 114 that has a cross-sectional height of about 2 mm and controls the amount of penetrating oil, in addition to the shell 111, the cage 112, and the plurality of needles 113. It has a bearing section height of 3 to 3.5 mm and a shaft diameter of 13 to 43 mm.

The seal ring 114 of the shell-type needle bearing 110 shown in FIG. 22 has been subjected to a cutting process, and is subjected to a heat treatment after the cutting process in order to prevent wear due to contact with a counterpart member or the like.
JP-A-6-294418 JP 2000-291669 A Japanese Utility Model Publication No.6-23776

  Incidentally, in the shell type needle bearing 100 shown in FIG. 21, it is required to control the amount of the penetrating oil. On the other hand, in the shell type needle bearing 110 shown in FIG. There is a problem that required accuracy such as inner ring roundness and inner diameter dimension tolerance cannot be obtained.

The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a method for manufacturing a shell-type needle bearing with a seal ring that has good dimensional accuracy and can control the amount of oil penetrating. It is to provide.

(1) a shell having a raceway surface on an inner peripheral surface or an outer peripheral surface and flange portions on both ends;
A cage having a plurality of pockets in the circumferential direction;
A plurality of needles held in each of the pockets so as to be freely rollable along the raceway surface;
A cylindrical seal ring provided between the end face of the retainer and the flange portion inside or outside the shell;
A method for producing a shell-type needle roller bearing with a seal ring comprising:
The seal ring constitutes a floating seal,
The sealing ring molding step
A punching step of punching and forming a circular hole in a part of a metal plate as a material;
A burring process for forming a cylindrical portion by bending the circumference of the circular hole at right angles to the metal plate and over the entire circumference,
The cylindrical portion is compressed in the axial direction in a state where the outer peripheral surface of the cylindrical portion is constrained and at least a part of the inner peripheral surface is not constrained in the axial direction, and the outer diameter and the axial dimension of the cylindrical portion are predetermined. A dimensional regulation process that regulates the value and bulges the surplus radially inward to form a first intermediate cylindrical material;
By pushing a handling punch having an appropriate outer diameter into the inner diameter side of the first intermediate cylindrical material from one end side in the axial direction, surplus thickness present on the inner peripheral surface portion of the first intermediate cylindrical material is axially removed. Collecting on the other end side, having a surplus flange portion in the shape of an inward flange on the inner peripheral surface of the other end in the axial direction, a handling step to be a second intermediate cylindrical material,
By inserting a punching punch having an appropriate outer diameter inside the second intermediate cylindrical material, a surplus removal step for removing the surplus brim portion and making it a high-accuracy ring,
At any timing after the burring step, the cylindrical part or any intermediate cylindrical material made from the cylindrical part or the high-accuracy ring is separated from the metal plate, and a separation process;
A method for producing a shell-type needle bearing with a seal ring, comprising :

(2) The metal plate that is the material of the seal ring is a long metal plate drawn from the coil,
This metal plate is sent sequentially with the progress of the processing work of the seal ring without being cut over the entire width,
In the detaching step, the cylindrical portion or any intermediate cylindrical material made from the cylindrical portion is separated from the metal plate, and the metal plate is changed from the metal plate to a part of the metal plate in the detaching step. The cylindrical portion or any intermediate cylindrical material that has been subjected to predetermined processing in a state where the second circular hole is cut out, and after finishing the predetermined processing, the second circular hole is again formed. Push it inward and send it to the next processing step with the metal plate,
The manufacturing method of the shell type needle bearing with a seal ring of Claim 1 characterized by the above-mentioned.
(3) The method for manufacturing a shell-type needle bearing with a seal ring according to (1), wherein the seal ring is not heat-treated after the molding step .

(4) The method for manufacturing a shell type needle bearing with a seal ring according to (1), wherein the seal ring is subjected to an abrasion resistance treatment after the forming step .

(5) The method for manufacturing a shell type needle bearing with a seal ring according to any one of (1) to (4) , wherein the cage is a resin cage.

According to the manufacturing method of the shell type needle bearing with a seal ring of the present invention, the seal ring is molded by the molding step (1), so that a good dimensional accuracy can be obtained in the seal ring and contact with the mating member. Wear due to can be prevented. In addition, since the seal ring is provided, the amount of penetrating oil can be controlled. Further, since the seal ring is a floating seal, the torque can be reduced as compared with the contact seal.

  In addition, since the seal ring is not subjected to heat treatment after being formed by press working, the cost can be reduced.

  Furthermore, since the seal ring is molded by press work and is subjected to wear resistance, wear of the seal ring due to sliding contact with the flange portion provided at the end of the shell can be prevented. In addition, if the nitriding treatment is performed at a low temperature as the wear resistance treatment, the wear resistance can be improved while preventing the seal ring from being deformed due to the wear resistance treatment, and a thin seal ring is manufactured with high accuracy. be able to.

  Further, by using a cage made of resin as a cage, it is possible to easily and inexpensively produce a thin-walled cage, in which it is difficult to form a pocket with a metal cage, in particular, to process a nail for holding a needle. .

  Hereinafter, a shell type needle bearing with a seal ring according to an embodiment of the present invention will be described in detail with reference to the drawings.

  The shell type needle bearing 30 with seal ring is disposed between the gear trains in the automatic transmission, between the gear shaft and the housing, or on the side of the oil pump gear. As shown in FIG. 1, the shell type needle bearing 30 includes a shell (a flanged outer ring) 31, a cage 32, a plurality of needles 33, and a cylindrical seal ring 34. Or an inner ring member) is rotatably supported.

  The shell 31 has a raceway surface 31a on the inner peripheral surface and inward flange portions 31b and 31c on both ends. The cage 32 has a plurality of pockets 32a in the circumferential direction.

  Here, when the cage 32 is made of metal, it is made of steel such as SPCC, S10C, AISI-1010, SCM415, SK5, SUJ2, and is processed by welding cage, press cage, or machining. The cage 32 may be subjected to conventional carbonitriding or salt bath soft nitriding (tuftride) heat treatment. However, the cage 32 has a thin plate thickness and is applied to a needle bearing having a shaft diameter of 40 mm or more. In this case, there is a possibility that the needle 33 may sink between the raceway surface 31 a and the outer diameter surface of the cage 32 due to the heat treatment deformation of the cage 32. For this reason, in order to suppress such heat treatment deformation, the cage 32 employs tuftride SQ (single quench) processing, NV nitriding processing, or the like.

  When the cage 32 is made of resin, polyamide 46, polyamide 66, PPS (polyphenylene sulfide), or the like can be applied. The polyamide 46 can be used continuously in an environment of 150 ° C., and can be used up to about 170 ° C. instantaneously. Polyamide 66 can be used up to about 120 ° C., and PPS can be used up to 200 ° C. Moreover, 20-30% of glass fibers are mixed in each resin material for strength improvement.

  When the cross-sectional height of the shell needle bearing 30 is about 1.5 to 2.5 mm, the thickness of the cage is also 1 mm or less. By molding such a thin cage with resin, a claw for holding a pocket or a needle can be easily formed as compared with a metal cage.

  For example, in the resin cage 32 having an inner diameter of 45 mm, roundness is required. In order to manufacture such a high-precision resin cage, it is effective to anneal the cage after injection molding.

  The needle 33 is rotatably held in each pocket 32a of the retainer 32 so as to be freely rollable along the raceway surface 31a of the shell 31, and both ends thereof are crowned. Yes.

  The seal ring 34 is made of steel such as SPCC, SPCE, SUJ2, and is provided between the end surface 32b of the cage 32 and the inward flange portion 31b on the inner side of the shell 31 on the downstream side of the flow of the lubricating oil. The amount of lubricating oil that passes through the needle bearing 30 is regulated. The seal ring 34 may be made of a non-ferrous metal such as copper, a copper-based alloy, aluminum, or an aluminum-based alloy as necessary. The seal ring 34 is preferably SPCC or SPCE when the following processing method as in the present embodiment is used. Further, the seal ring 34 is a floating seal having an outer diameter slightly larger than the outer diameter of the shaft and slightly smaller than the inner diameter of the shell 31.

  The shell needle bearing 30 has a bearing cross-sectional height of 1.0 to 3.5 mm, preferably 1.5 to 2.5 mm, more preferably 1.5 to 2.0 mm, and a shaft diameter of 100 mm or less. The seal ring 34 disposed in the shell 31 with the thinned configuration also has a cross-sectional height of 0.8 to 1.8 mm. The seal ring 34 having such dimensions and shape is molded by press working (in this embodiment, a dimension regulating process, a punching process, a re-pulling process described later) or a cold rolling process, and is formed by work hardening. Since the surface hardness is improved, it can be manufactured without performing heat treatment (quenching and tempering treatment) in a subsequent process, and has good dimensional accuracy that does not cause deformation due to heat treatment. Moreover, you may make it perform abrasion-proof processing, such as a nitriding process, as needed, such as the conditions in which the shell type needle bearing 30 is used.

  Specifically, the seal ring 34 is formed by the following processing method, for example.

[Processing method of the first example]
In the case of this processing method, first, as shown in FIG. 2A, a metal plate 1 such as a mild steel plate or a stainless steel plate, which is a material, is subjected to piercing, and shown in FIG. Thus, a first preliminary intermediate material 3 having a circular hole 2 is obtained. Next, the first preliminary intermediate material 3 is subjected to a burring process in which the periphery of the circular hole 2 is bent over the entire circumference at right angles to the metal plate 1 as shown in FIG. The second preliminary intermediate material 5 having the cylindrical portion 4 is used. The volume of the cylindrical portion 4, particularly the axial length, is larger than the volume of the seal ring to be manufactured, particularly the axial length.

  The cylindrical portion 4 of the second preliminary intermediate material 5 is subjected to plastic working in a subsequent dimension regulating step, and this cylindrical portion 4 is converted into the first intermediate cylindrical material 6 shown in FIG. And In the dimension regulating step, the outer peripheral surface of the cylindrical portion 4 is constrained by a mold (not shown) having a cylindrical inner peripheral surface having a predetermined inner diameter, and the inner peripheral surface of the cylindrical portion 4 is not constrained. In the state, between a pair of flat surfaces that are arranged concentrically and move in the axial direction (for example, a receiving step formed on the inner peripheral surface of the end of the mold and a pressing mold fitted in the mold) The cylindrical portion 4 is pressed (compressed in the axial direction while being plastically deformed) to a desired dimension, that is, the axial dimension of the seal ring to be obtained. With the plastic deformation that is compressed in the axial direction in this way, the outer diameter and axial dimension of the cylindrical portion 4 are regulated to predetermined values, and the surplus wall bulges inward in the radial direction. The first intermediate cylindrical material 6 is obtained. The inner diameter of the first intermediate cylindrical material 6 is smaller than the inner diameter of the seal ring to be obtained.

  In the case of the embodiment shown in FIG. 2, as shown in FIG. 2E, after the first intermediate cylindrical material 6 is formed, a separation step is performed, and the first intermediate cylindrical material 6 is formed. Is separated from the metal plate 1. This separation step is performed by punching using a press machine.

  In this manner, the first intermediate cylindrical material 6 separated from the metal plate 1 is subsequently subjected to a handling process that expands the inner diameter dimension to an appropriate value (the inner diameter dimension of the seal ring to be obtained). In this handling process, the outer peripheral surface of the first intermediate cylindrical material 6 is restrained so that the outer diameter does not expand, while being appropriate (to be obtained) on the inner diameter side of the first intermediate cylindrical material 6. A handling punch having an outer diameter dimension (corresponding to the inner diameter dimension of the seal ring) is pushed in from one axial end side (upper side of (F) in FIG. 2). By pushing the handling punch in such a manner, the surplus thickness present on the inner peripheral surface portion of the first intermediate cylindrical material 6 is collected on the other axial end side {lower side of (F) in FIG. 2}. As shown in (F), a second intermediate cylindrical material 8 having an inward flange-shaped surplus flange portion 7 on the inner peripheral surface of the other axial end portion is provided.

  This second intermediate cylindrical material 8 is sent to the next surplus removal process to remove the surplus rib portion 7. In this surplus thickness removing step, by inserting a punching punch having an appropriate outer diameter dimension (corresponding to the inner diameter dimension of the seal ring to be obtained) inside the second intermediate cylindrical material 8, 7 is removed to obtain a seal ring 34 as shown in FIG.

  The processing operation of the seal ring 34 can be completed at the stage shown in FIG. 2G, but at the stage shown in FIG. 2G, the inner diameter of the inner peripheral surface of the seal ring 34 or If it is difficult to make the properties as desired, as shown in FIG. 2H, the inner peripheral surface of the seal ring 34 may be rubbed with a handling jig and re-handled.

  In any case, the obtained seal ring 34 is sent to a process different from the present invention in which the seal ring 34 is subjected to predetermined processing. In this way, the seal ring 34, which is sent to another process, has an outer diameter, an axial dimension, and an inner diameter dimension regulated to appropriate values, so there is no need to scrape the axial end by turning or the like. . In addition, it is not necessary to perform processing that requires a large processing force such as extrusion processing, and the manufacturing cost of the seal ring 34 can be kept low.

  In the first example of the processing method, the seal ring 34 in which the inner diameter, the outer diameter, and the axial dimension are regulated to appropriate values can be industrially mass-produced, and can be configured at low cost, and the operation cost can be reduced. Can be made with a processing device that does not bulk up. In other words, the obtained seal ring 34 is controlled to have an outer diameter and an axial dimension in the dimension regulating process, and an inner diameter dimension is adjusted to an appropriate value by the handling process and the surplus removal process. Thus, a highly accurate cylindrical seal ring 34 in which each of these dimensions is set to an appropriate value can be obtained without scraping.

[Processing method of the second example]
3-7 has shown the processing method of the 2nd example. In the case of this example, the metal plate 1 is processed into the seal ring 34 by sequentially performing the steps shown in FIGS. This process is substantially the same as in the case of the processing method of the first example. Also in the case of this example, the re-handling process as shown in FIG. The feature of this example is that the metal plate 1 is a long sheet that is fed from an uncoiler (not shown) and wound around a recoiler (not shown), and is shown in FIGS. The point is that the process can be carried out in order. That is, the long metal plate 1 is intermittently fed in synchronization with the progress of the processing at a pitch (interval / pitch = integer) corresponding to the interval between adjacent processing devices for performing each process. However, the steps shown in FIGS. 3A to 3G are sequentially performed.

  Therefore, in the case of this example, the seal ring 34 is cut without cutting the long metal plate 1 over the entire width in any of the steps shown in FIGS. Sequentially send as processing progresses. Then, a second circular hole 10 larger than the circular hole 2 shown in FIG. 3B is formed on the long metal plate 1 drawn out from the uncoiler by the cutting step shown in FIG. Even in the formed state, the width dimension of the metal plate 1 is secured so that both ends in the width direction of the metal plate 1 remain connected to each other (“width dimension> diameter of the second circular hole 10”). To do). And the predetermined | prescribed process was given to the 1st intermediate | middle cylindrical raw material 6 (and the 2nd middle ring cylindrical raw material 8 produced by the following processes) punched out from the inside of the said 2nd circular hole 10 at the said isolation | separation process. Then, after fitting back into the second circular hole 10 again, the metal plate 1 is fed into a processing apparatus that performs the next step as the metal plate 1 is fed. 3A to 3G is the same as the process shown in FIG. 2A to FIG. 2G as described above, and therefore, redundant description is omitted. In the following, the description will be focused on the point that the above-described fitting back can be performed so that the process shown in FIGS.

  The separation process and the fitting back process shown in FIG. 3E are performed by the processing apparatus shown in FIG. In the processing apparatus shown in FIG. 4, the metal plate 1 is restrained between the upper surface of the cylindrical die 14 and the lower surface of the restraining die 12 that moves up and down in the state of being given downward elasticity. 13, the first intermediate cylindrical material 6 is pushed into the die 14, and the first intermediate cylindrical material 6 is separated from the metal plate 1. Further, a push-back die 15 provided with an upward elastic force is provided on the inner diameter side of the die 14 so that an upward elastic force can be applied to the first intermediate cylindrical material 6. However, the push-back die 15 is retracted downward when the punch 13 is lowered based on the abutment between the abutting block 16 provided at the center of the upper surface and the lower end surface of the punch 13.

  3 using the machining apparatus as shown in FIG. 4 is performed in the order shown in FIGS. 5A to 5C. First, as shown in FIG. 5A, the first intermediate cylindrical material 6 that is still coupled to the metal plate 1 is fitted into the upper end of the die 14. Next, together with the ram 17 constituting the processing machine, the holding die 12 and the punch 13 are lowered, and the lower surface of the holding die 12 and the upper surface of the die 14 are moved as shown in FIG. The first intermediate cylindrical material 6 is pushed into the die 14 by the punch 13 while holding the metal plate 1 in between. As a result, the first intermediate cylindrical material 6 is separated from the metal plate 1, and at the same time, the second circular hole 10 is formed in the metal plate 1. After the separation, when the holding die 12 and the punch 13 are raised together with the ram 17, the push-back die 15 that has been pushed down by the punch 13 is lowered as shown in FIG. To rise. As a result, the first intermediate cylindrical material 6 is pushed into the second circular hole 10 by the push-back die 15 and is held inside the second circular hole 10. Therefore, by moving the metal plate 1, the first intermediate cylindrical material 6 is sent to the next handling process and the returning process shown in FIG.

  The handling process and the fitting back process shown in FIG. 3F are performed by the processing apparatus shown in FIG. In the processing apparatus shown in FIG. 6, the metal plate 1 is restrained between the upper surface of the receiving die 18 provided with upward elasticity and the lower surface of the cylindrical handling die 20 that moves up and down. The first intermediate cylindrical material 6 is pushed into the handling die 20 by 19. The ring punch 19 is provided on the inner diameter side of the receiving die 18 so as to be able to move up and down independently of the receiving die 18 and with an upward elasticity. Further, on the inner diameter side of the ring punch 19, a handling punch 21 for fixing the second intermediate cylindrical material 8 by handling the inner peripheral surface of the first intermediate cylindrical material 6 is fixed. The ring punch 19 is installed to be movable up and down around the handling punch 21, but the maximum rising amount is limited by the engagement between the inner peripheral surface of the ring punch 19 and the outer peripheral surface of the handling punch 21. Specifically, as shown in FIG. 6 and FIG. 7 (A), the maximum rising amount is such that the upper edge of the ring punch 19 is the receiving die when the receiving die 18 is most elevated. 18 is positioned slightly below the upper surface. Further, on the inner diameter side of the die 20, a push-back die 22 provided with downward elasticity is provided.

  The handling process and the fitting back process shown in FIG. 3 (F) using the processing apparatus as shown in FIG. 6 are performed in the order shown in FIG. 7 (A) → (C). First, as shown in FIG. 7A, the first intermediate cylindrical material 6 held inside the second circular hole 10 is fitted inside the upper end of the receiving mold 18, The lower end surface is abutted against the upper end edge of the ring punch 19. Next, as shown in FIG. 7B, the handling die 20 and the push-back die 22 are lowered together with the ram 23 constituting the processing machine, and the metal plate 1 is formed on the lower surface of the handling die 20. Is pushed down, the first intermediate cylindrical material 6 is extracted upward from the second circular hole 10, and is fed into the inner diameter side of the handling die 20 by the ring punch 19. As the handling die 20 is further lowered along with the ram 23, the handling punch 21 is moved to the inner diameter side of the first intermediate cylindrical material 6 fed to the inner diameter side of the handling die 20 in this way. Pushed in. As a result, the inner diameter of the first intermediate cylindrical material 6 is restricted to a predetermined size, and the surplus portion is collected at the upper end portion of the inner peripheral surface, and the surplus rib portion 7 {FIG. (F)} is formed as the second intermediate cylindrical material 8. After the second intermediate cylindrical material 8 is formed in this way, when the handling die 20 is lifted together with the ram 23, the metal plate 1 pushed down by the handling die 20 is lowered. At the same time as the mold 18 is raised, the push-back mold 22 is lowered with respect to the handling die 20. At this time, the push-back die 22 presses the surplus rib portion 7 {see FIG. 3F) just formed on the inner peripheral surface of the upper end portion of the second intermediate cylindrical material 8 downward. The second intermediate cylindrical material 8 is pushed into the second circular hole 10 and is held inside the second circular hole 10.

  Therefore, by moving the metal plate 1, the second intermediate cylindrical material 8 is sent to the next surplus removal process and the return process shown in FIG. If the re-handling process shown in FIG. 2H is performed after the surplus removing process shown in FIG. 3G, the seal ring obtained by the surplus removing process is performed. A returning step of pushing 34 into the second circular hole 10 of the metal plate 1 is performed. On the other hand, if the seal ring 34 obtained in the surplus removal process is sent to a process for performing a predetermined process on the seal ring 34, which is different from the present invention, the return process is omitted. It is also possible to {take out the seal ring 34 separated from the metal plate in FIG. 3G as it is}.

  In the case of this example configured as described above, in addition to the operations and effects obtained by the first example, it can be manufactured by a continuous processing apparatus that can be industrially mass-produced and that does not increase operating costs. You can get the action and effect. That is, in the case of this example, a long metal plate 1 sent out from an uncoiler and wound up by a recoiler is used as the metal plate 1, and the metal plate 1 is separated from the metal plate 1 in accordance with a separation step and is predetermined. Since the processed first and second cylindrical intermediate materials 6 and 8 are pushed into the second circular hole 10 of the metal plate 1 again, the intermediate materials 6 and 8 are inserted into the metal plate 1. At the same time, it can be sent to the next processing step. That is, compared with transfer processing, the capital investment is low, and the processing efficiency is good (the processing cycle is short), so that progressive processing can be performed. For this reason, the lowering cost of the seal ring 34 can be further reduced.

[Processing method of the third example]
FIG. 8 shows a processing method of the third example. In the case of this example, there is a direction in which the second cylindrical intermediate material 8 is extracted from the second circular hole 10 of the metal plate 1 and fitted again in the handling step and the fitting back step shown in FIG. The metal plate 1 is upside down from the case of the processing method of the second example described above. It goes without saying that the configuration of the processing apparatus shown in FIGS. About the structure of another part, since it is the same as that of the processing method of the 2nd example mentioned above, the overlapping description is abbreviate | omitted.

[Fourth Example Processing Method]
FIG. 9 shows a processing method of the fourth example. In the case of this example, the detaching step and the returning step shown in FIG. 9D are set after the burring step shown in FIG. About the structure of another part, since it is the same as that of the processing method of the 2nd example mentioned above, the overlapping description is abbreviate | omitted. In short, when carrying out the present invention, the separation step can be set at an arbitrary timing after the burring step, taking into consideration the ease of the processing operation, ensuring the processing accuracy, and the like.

  As described above, the shell type needle roller bearing 30 with a seal ring according to the present embodiment is formed by press working the seal ring 34 so that a good dimensional accuracy can be obtained in the seal ring 34, and the contact with the mating member. Wear can be prevented. Further, by having the seal ring 34, the amount of penetrating oil can be controlled. Furthermore, since the seal ring 34 is a floating seal, torque can be reduced compared to the contact seal. The seal ring 34 is more preferably 1.0 to 2.5 mm in bearing cross-sectional height, which can reduce the thickness.

  In particular, since the seal ring 34 is not subjected to heat treatment after being formed by press working, the cost can be reduced.

[Fifth Example Processing Method]
In the processing method of the seal ring of this example, first, a long metal plate drawn out from an uncoiler is punched into a circle by a press or the like to form a metal plate 1 as shown in FIG. .

  Next, as a first step, by punching the central portion of the metal plate 1 by punching using a press or the like, the first annular intermediate preliminary material 3 as shown in the upper part of FIG. To do. The disc-like scrap 51 shown in the lower part of FIG. 10B generated as a result of the punching is discarded or used as a material for making a smaller diameter seal ring.

  As a second step, the first preliminary intermediate material 3 is subjected to a burring process in which a portion near the inner diameter of the first preliminary intermediate material 3 is bent at right angles to the axial direction. In the burring process, as is widely known in the field of metal processing, this first preliminary intermediate material 3 is held in a state where the outer diameter portion of the first preliminary intermediate material 3 is clamped from both sides in the axial direction by a pair of holding dies. This is done by pushing a punch die into the inner diameter portion of the preliminary intermediate material 3. By the burring process performed in this manner, a cylindrical portion 4 and an outward flange portion 9 bent radially outward from one axial end portion of the cylindrical portion 4 as shown in FIG. 10C are provided. The second preliminary intermediate material 5 is L-shaped in cross section and has an annular shape as a whole. According to the processing method of the seal ring of the present invention, a high-precision thin ring is made from the cylindrical portion 4 of the second preliminary intermediate material 5. On the other hand, the portion of the outward flange 9 that is present radially outward from the outer peripheral surface of the cylindrical portion 4 is an annular scrap 52 {FIG. D) Refer to the lower section} and discard.

  Next, the second preliminary intermediate material 5 is punched by pressing or the like in the subsequent third step, and the outward flange 9 is removed, as shown in the upper part of FIG. A cylindrical first intermediate cylindrical material 6 is used. The outer diameter of the first intermediate cylindrical material 6 coincides with the outer diameter of the seal ring 34 to be manufactured.

  The first intermediate cylindrical material 6 obtained in this way is subjected to cold rolling in the subsequent fourth step. Then, by the plastic working by the cold rolling process, the inner and outer diameters and the cross-sectional shape of the first intermediate cylindrical material 6 are adjusted, and the required shape accuracy and dimensional accuracy as shown in FIG. The seal ring 34 is provided. The cold rolling process for processing the first intermediate cylindrical material 6 into the seal ring 34 will be described in detail with reference to FIGS.

  The first intermediate cylindrical material 6 is fitted and supported by an annular die 40. The die 40 has both inner and outer peripheral surfaces that are concentric cylindrical surfaces, and a plurality of support rollers (not shown) in which each outer peripheral surface is in rolling contact with the outer peripheral surface of the die 40 (in the radial direction). It is supported only for rotation (with displacement prevented). The die 40 has an inner diameter that matches the outer diameter of the seal ring 34 (and the first intermediate cylindrical material 6) to be manufactured. During the fourth step, the first intermediate cylindrical material 6 is held on the inner peripheral surface of the die 40. In this state, the first intermediate cylindrical material 6 is pressed by the pressing roller 41 toward the inner peripheral surface of the die 40 in the direction of the arrow in FIG.

  On the outer peripheral surface of the intermediate portion of the pressing roller 41, a concave groove 42 is formed over the entire periphery in a portion aligned with the first intermediate cylindrical material 6. The cross-sectional shape of the concave groove 42 is rectangular, and the width dimension in the axial direction coincides with the width dimension of the seal ring 34 to be formed. The depth of the concave groove 42 in the radial direction of the pressing roller 41 is set to be equal to or less than the thickness dimension of the seal ring 34 to be formed. When the first intermediate cylindrical material 6 is processed into the seal ring 34, such a pressing roller 41 is pressed against the inner peripheral surface of the die 40 while rotating. A part of the first intermediate cylindrical material 6 in the circumferential direction is strongly suppressed between the inner peripheral surface of the die 40 and the inner surface of the concave groove 42.

  As the pressing roller 41 is pressed, the die 40 supports the pressing force of the pressing roller 41 while rotating in the same direction as the rotation direction of the pressing roller 41. The first intermediate cylindrical material 6 also rotates with the die 40. Therefore, a portion of the first intermediate cylindrical material 6 that is strongly suppressed between the inner peripheral surface of the die 40 and the inner surface of the concave groove 42 continuously changes in the circumferential direction. As a result, the cross-sectional shape of the first intermediate cylindrical material 6 changes as shown in FIGS. 13A to 13B over the entire circumference. That is, the first intermediate cylindrical material 6 is plastically deformed so that the cross-sectional shape of the first intermediate cylindrical material 6 matches the inner peripheral surface of the die 40 and the inner surface of the concave groove 42, thereby forming the seal ring 34. That is, at the time of the fourth step performed using the die 40 and the pressing roller 41, the shape of the inner diameter and the inner peripheral surface is not changed without changing the outer diameter and the outer peripheral shape of the first intermediate cylindrical material 6. And the seal ring 34 is processed.

According to the sealing ring processing method of this example configured as described above, the following first to fourth steps are provided.
“First step”: An annular first preliminary intermediate material 3 is formed by punching a metal plate.
“Second step”: By performing burring processing in which a portion near the inner diameter of the first preliminary intermediate material 3 is bent at right angles to the axial direction, the cylindrical portion 4 and one axial end portion of the cylindrical portion 4 are radially outward. A second preliminary intermediate material 5 having an L-shaped section and an annular shape as a whole is provided with an outward flange 9 bent in the direction.
“Third step”: The outwardly facing flange portion 9 of the second preliminary intermediate material 5 is removed to obtain a cylindrical first intermediate cylindrical material 6.
“Fourth step”: The inner and outer diameters and the cross-sectional shape of the first intermediate cylindrical material 6 are adjusted by cold rolling to obtain a seal ring 34 having the required shape accuracy and dimensional accuracy. The shape accuracy includes not only the accuracy related to the cross-sectional shape but also the accuracy related to the entire shape such as roundness.

  As a result, the seal ring 34, which is a high-accuracy thin-walled ring that is thin and needs to have sufficient inner and outer diameter dimensions and cross-sectional shape accuracy, can be manufactured at low cost. That is, in the case of this example, if the thickness of the metal plate to be the metal plate 1 is selected according to the radial thickness of the seal ring 34 to be manufactured, the thin seal ring 34 is also necessary with respect to the thickness dimension. While ensuring the accuracy, in other words, the accuracy of the inner and outer diameters can be sufficiently ensured, and a high-precision thin ring with good shape accuracy can be produced. In particular, since the cold rolling process for processing the first intermediate cylindrical material 6 into the seal ring 34 is performed using the die 40 and the pressing roller 41 as described above, excellent shape accuracy and dimensional accuracy are achieved. The seal ring 34 having it can be manufactured efficiently.

  In the fourth step, the first intermediate cylindrical material 6 is held on the inner peripheral surface of the annular die 40. In this state, the pressing roller 41 presses the inner peripheral surface of the first intermediate cylindrical material 6 toward the inner peripheral surface of the die 40. Preferably, in the third step, the first intermediate cylindrical material 6 having an outer diameter that matches the outer diameter of the completed seal ring 34 is formed. Thereafter, in the fourth step, the outer diameter of the first intermediate cylindrical material 6 is not changed, and the inner diameter and the shape of the inner peripheral surface are changed. Thereby, the seal ring 34 having excellent shape accuracy and dimensional accuracy can be efficiently manufactured.

[Sixth Example Processing Method]
14-16 has shown the processing method of the 6th example. In the case of the fifth example described above, the four corners of the cross-sectional shape of the seal ring 34 obtained (both axial end edges of the inner and outer peripheral surfaces) were pointed (the radius of curvature of the cross-sectional shape of the portion was extremely small). On the other hand, in the case of this example, it is intended that the four corners of the cross-sectional shape be convex arc surfaces (form corner R). With respect to the corners R at both ends in the axial direction of the inner peripheral edge, even in the above-described processing method of the fifth example, if the corner R is provided at the bottom corner of the concave groove 42 formed on the outer peripheral surface of the pressing roller 41 (bottom corner) (If the cross-sectional shape is a concave arc surface). On the other hand, if the corners R at both ends in the axial direction of the outer peripheral surface are formed only by the shape of the inner peripheral surface of the die, the completed seal ring cannot be taken out from the inner peripheral surface of the die.

  In view of such circumstances, the processing method of this example can take out the seal ring 34 in which the corners R are formed not only in the axial end edges of the inner peripheral surface but also in the axial end edges of the outer peripheral surface from the die 40a. This is intended to realize a processing method. In FIG. 14 showing the manufacturing method of this example, (A) to (C) are the same as (A) to (C) of FIG. 10 showing the processing method of the fifth example described above. 14E is the same as FIG. 10D except that a corner R portion 11 described below is formed in part. The feature of this example is that the preliminary processing step shown in FIG. 14D is provided and the shape of the inner peripheral surface of the die 40a used in the cold rolling process performed in (F) is devised. Therefore, overlapping illustrations and descriptions relating to parts similar to those of the above-described fifth example processing method will be omitted or simplified, and the following description will focus on parts that are different from the fifth example processing method.

  In the case of the processing method of the sixth example considered with the above-mentioned intention, it is shown in FIG. 15 at one end edge of the outer peripheral surface of the first intermediate cylindrical material 6 shown in the upper part of FIG. Such a corner R portion 11 is formed. The step of forming the corner R portion 11 may be performed before the first intermediate cylindrical material 6a is set on the inner peripheral surface of the die 40a shown in FIG. 16 (internally fitted into the annular die 40a). That is, the process may be performed between (B) and (C) in FIG. 14, between (C) and (E), and between (E) and (F). In the case of this example, before the second preliminary intermediate material 5 shown in (C) is processed into the first intermediate cylindrical material 6 shown in (E), in FIG. The corner R portion 11 as shown in FIG. Such a corner R portion 11 is formed in a state in which the cylindrical portion 4 is externally fitted to a cylindrical core, with the outer peripheral surface tip edge of the cylindrical portion 4 having a concave arc surface shape on the tip surface. This is performed by pressing an annular pressing die formed over the entire circumference of the pressing surface and plastically deforming the front edge of the outer circumferential surface.

  In the preliminary processing step performed in this way, the third preliminary intermediate material 5A shown in FIG. 14D in which the corner R portion 11 is formed at the peripheral edge of the outer peripheral surface of the cylindrical portion 4 is described above. As in the case of the fifth example, a punching process such as a press process is performed. And the outward eaves part 9 is removed and it is set as the cylindrical 1st intermediate | middle cylindrical raw material 6 as shown to the upper stage part of (E) of FIG. The corner R portion is provided at one end edge in the axial direction of the outer peripheral surface among both end portions in the axial direction of both the inner and outer peripheral surfaces of the first intermediate cylindrical material 6. In contrast, the other axial end edge of the outer peripheral surface and the both axial end edges of the inner peripheral surface remain pointed. Therefore, when the inner and outer diameters and the cross-sectional shape of the first intermediate cylindrical material 6 are adjusted in the fourth step shown in FIGS. Corner R portions are formed at both end edges in the axial direction of the peripheral surface. Then, the seal ring 34 has corner R portions formed at the four corners of the cross-sectional shape, and has the required shape accuracy and dimensional accuracy.

  In order to obtain such a seal ring 34, as shown in FIG. 16, the inner peripheral surface of the annular die 40a used in the fourth step has a large diameter portion 43 and a small diameter portion which are concentric cylindrical surfaces. 44 is a stepped cylindrical surface made continuous by a step 45. Further, the step portion 45 is a concave arc surface whose cross-sectional shape is a quarter arc. Further, the bottom axial end corners of the concave groove 42a formed on the outer peripheral surface of the pressing roller 41a are also concave arc surfaces having a quarter arc shape in cross section. About the structure of the other part regarding a cold rolling processing apparatus, it is the same as that of the processing method of the 5th example mentioned above.

  In the case of this example, the first intermediate cylindrical material 6 is provided on the die 40a, and the first intermediate cylindrical material 6 is provided on the stepped portion 45 that is the concave arc surface provided on the inner peripheral surface of the die 40a. It fits in the state where the other axial end edge (pointed edge) of the outer peripheral surface of 6 is opposed. As in the fifth example described above, the first intermediate cylindrical material 6 is pressed against the inner peripheral surface of the die 40a by the pressing roller 41a. As a result of this pressing, the cross-sectional shape of the first intermediate cylindrical material 6 changes as shown in FIGS. 16A to 16B over the entire circumference. That is, the first intermediate cylindrical material 6 is plastically deformed so that the cross-sectional shape of the first intermediate cylindrical material 6 matches the inner peripheral surface of the die 40 a and the inner surface of the concave groove 42, thereby forming the seal ring 34. At this time, the shape of the concave arc surface constituting the corners in the bottom axial direction of the concave groove 42 is at both edges of the inner peripheral surface of the first intermediate cylindrical material 6, and the shape of the step 45 is the first. It is transferred to the other axial end edge of the outer peripheral surface of the intermediate cylindrical material 6 respectively. Since the corner R portion 11 is originally formed at one end edge in the axial direction of the outer peripheral surface of the first intermediate cylindrical material 6, both inner and outer circumferences of the seal ring 34 obtained as a result of the fourth step. Corner R portions each having a quarter arc shape in cross section are formed at both axial end edges of the surface.

  According to the seal ring processing method of the present example configured as described above, the corner R portions (convex arc shape) each having a quarter arc shape in cross section at both axial end edges of the inner and outer peripheral surfaces. The high-quality seal ring 34 having the above-mentioned structure can be efficiently manufactured by an industrial method. That is, if the corner R portions are formed at both axial end edges of both the inner and outer peripheral surfaces, machining such as turning and grinding is performed on the seal ring 34 manufactured by the processing method of the fifth example described above. But you can make it. However, in the method of forming the corner R portion by such machining, the machining cost increases, and the obtained seal ring, and thus various mechanical devices such as an automobile transmission incorporating this seal ring are installed. The increase in cost is inevitable. On the other hand, according to the processing method of this example, after the first step, before the fourth step, that is, between the first step and the second step, the second step and the third step. An intermediate material (any one of the first preliminary intermediate material 3 to the first intermediate cylindrical material 6) between the processes or between the third process and the fourth process. ) Is subjected to pre-formation so that the cross-sectional shape of at least one end edge of the outer peripheral surface edge is, for example, a quarter-arc-shaped convex arc shape. The seal ring 34 can be manufactured efficiently.

[Seventh Example Processing Method]
Next, a description will be given of a seventh example processing method for performing an abrasion resistance treatment on the seal ring. The seal ring 34 processed by the processing methods of the first to sixth examples is not subjected to heat treatment or the like after press forming in order to avoid deformation caused by heat treatment such as quenching or tempering, and processes the metal plate. Work hardening (work hardening by press working in the processing methods of the first to fourth examples, work hardening by cold rolling work in addition to press working in the processing methods of the fifth and sixth examples) is expected. . Even in the case of work hardening, since the seal ring 34 constitutes a floating seal, there is no problem in normal use. However, when the shell type needle bearing 30 is used under severe conditions, it is desirable that the seal ring 34 be subjected to wear resistance.

  As the wear-resistant treatment, a processing method that does not cause deformation due to the wear-resistant treatment is desirable in order to finish the thin seal ring 34 with the required shape accuracy and dimensional accuracy. Specifically, a nitriding treatment that can be performed at a low temperature is conceivable. The nitriding treatment includes, for example, gas nitriding, salt bath nitriding, ion nitriding and the like, and an Nv nitriding process (trademark of Air Water Co., Ltd.) that can be treated at a relatively low temperature is preferable.

  In the Nv nitriding process, for example, the seal ring 34 formed into a cylindrical shape by any one of the processing methods of the first to sixth examples is first subjected to a fluorination treatment using a fluorine-based gas such as NF3. A gas nitriding process is performed to form a nitride layer on the surface of the seal ring 34. By the fluorination treatment, Cr oxide on the surface of the material to be treated that inhibits nitriding is removed, and a fluorinated layer that activates the surface of the material to be treated is formed. Thereby, even if nitriding is performed at a low temperature of about 400 ° C., a relatively uniform nitride layer is formed. As described above, since both the fluorination treatment and the nitridation treatment are performed at a low temperature, the seal ring 34 is not deformed, and the high dimensional accuracy and shape processed by the processing methods of the first to sixth examples are maintained. A highly accurate seal ring 34 can be manufactured. As described above, by performing the Nv nitriding process on the seal ring 34, a nitride layer having a surface hardness of Hv 400 or more and a thickness of 5 to 20 μm is formed, and deformation of the seal ring 34 due to wear resistance treatment is prevented. Abrasion resistance can be improved.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  In this embodiment, the outer ring shell 31 having the raceway surface 31a on the inner peripheral surface and the inward flange portions 31b and 31c on both ends is used. Each inner ring shell may be used. In this case, the seal ring is provided outside the shell and between the end face of the cage and the outward flange portion.

  Next, using a shell type needle bearing with a seal ring of the present invention and a conventional sliding bearing (bush), a comparative test was performed with respect to dynamic torque and penetrating oil amount. The comparative test of dynamic torque was performed with a bearing cross-section height of 1.5 mm for both bearings and a test load of 500N. In addition, in the comparative test of the amount of penetrating oil, both the height of the cross section of the bearing is 1.5 mm and the upper limit of the clearance between the seal ring and the shaft is 0.06 mm and the upper limit of the clearance is 0.08 mm. The bushing was used, the shaft rotation speed was 0 to 3000 rpm, the lubricating oil was JWS3309 (manufactured by Exxon Mobile), the hydraulic pressure was 30 kPa, and the oil temperature was about 80 ° C. FIG. 17 shows the measurement result of the dynamic torque, and FIG. 18 shows the measurement result of the penetrating oil amount.

  As shown in FIG. 17, in the dynamic torque comparison test, it can be seen that the torque can be reduced by using a shell type needle bearing. In particular, it is confirmed that the torque reduction effect is large in a low speed region where fuel efficiency is poor.

  Further, as shown in FIG. 18, in the comparison test of the amount of penetrating oil, the amount of penetrating oil of the shell type needle bearing having a gap of 0.06 mm is the maximum compared to the amount of penetrating oil of the bush having a gap of 0.08 mm. It is only about 4 mL high and can limit the through flow rate to the same extent as the bush.

  Next, using a material mixed with 25% glass fiber in polyamide 46 that can be used at high temperatures and easy to manufacture, a resin cage having an inner diameter of 45 mm is injection-molded while changing the molding conditions. The outer diameter roundness with and without annealing treatment was compared. FIG. 19 shows the result.

  In the test, four types of resin cages with different conditions were molded, and one type of molded product was annealed. The annealing treatment was performed by inserting a 45.22 mm annealing shaft into the inner diameter of the resin cage and holding at 170 ° C. for 3 hours. Roundness is measured using a tool microscope and measuring the outer diameters of the resin side cages (10 for each cage without annealing treatment and 20 for cages with annealing treatment) on the gate side and ejector side, respectively. The average value was obtained.

  As shown in FIG. 19, the resin cages that were not annealed were found to be out of tolerance (± 0.1 mm), although there were some differences depending on the molding conditions. On the other hand, all the resin cages subjected to the annealing treatment are within the tolerance, and it can be seen that the annealing treatment is effective in improving the roundness.

  Next, a test was conducted on warpage deformation when three wear resistance treatments of tuftride (salt bath nitriding), NV nitriding, and NV nitriding (no oxide film) were performed. FIG. 20 shows the amount of warpage in these processes. As a result, it can be seen that the amount of warpage of all products is within the standard range even when any of NV nitridation, NV nitridation (no oxide film), and Alcoa VG7 is performed.

It is sectional drawing of the shell type needle bearing with a seal ring which concerns on one Embodiment of this invention. It is sectional drawing which shows the manufacturing process of the 1st example of a seal ring, (A) is a raw material metal plate, (B) is the inside diameter removal, (C) is a burring, (D) is compression molding, (E ) Shows the cylindrical part cut, (F) shows the inner diameter ironing, (G) shows the surplus cut, and (H) shows the re-ironing. It is sectional drawing which shows the manufacturing process of the 2nd example of a seal ring, (A) is a coil preform | base_material, (B) is the inside diameter removal, (C) is a burring, (D) is compression molding, (E ) Shows the cylindrical part cut, (F) shows the inner diameter ironing, and (G) shows the surplus cut. In a 2nd example, it is sectional drawing of the press apparatus used for a cutting-off process and the subsequent fitting back process. It is sectional drawing which shows a cutting-off process and the subsequent fitting-back process in order of progress of a process, (A) is a state figure before a process, (B) is a state figure during a process, (C) is a ring of a coil base material. It is a state diagram returned to the original state. In a 2nd example, it is sectional drawing of the press apparatus used for a handling process and the subsequent fitting back process. It is sectional drawing which shows a handling process and the subsequent fitting back process in order of a process progress, (A) is a state figure before a process, (B) is a state figure during a process, (C) is a ring of a coil base material. It is a state diagram returned to the original state. It is sectional drawing which shows the manufacturing process of the 3rd example of a seal ring, (A) is a coil preform | base_material, (B) is the inside diameter removal, (C) is a burring, (D) is compression molding, (E ) Shows the cylindrical part cut, (F) shows the inner diameter ironing, and (G) shows the surplus cut. It is sectional drawing which shows the manufacturing process of the 4th example of a seal ring, (A) is a coil preform | base_material, (B) is the inside diameter removal, (C) is a burring, (D) is compression molding, (E ) Shows the cylindrical part cut, (F) shows the inner diameter ironing, and (G) shows the surplus cut. It is sectional drawing which shows the manufacturing process of the 5th example of a seal ring, (A) is a raw material metal plate, (B) is the inside diameter removal, (C) is a burring, (D) is a cylindrical part cut, (E) shows cold rolling. It is a side view which shows the implementation condition of a cold rolling process. It is XII-XII sectional drawing of FIG. (A) is a state before the start of the cold rolling process, and (B) is an enlarged view of a portion XIII in FIG. 12 showing a state after the processing. It is sectional drawing which shows the manufacturing process of the 6th example of a seal ring, (A) is a raw metal plate, (B) is an inside diameter removal, (C) is a burring, (D) is corner R part formation, (E) shows the cylindrical part cut, and (F) shows cold rolling. The It is the XV part enlarged view of (D) of FIG. FIG. 14A is an enlarged view similar to FIG. 13 showing a state before the start of cold rolling, and FIG. It is a graph which shows the measurement result of the dynamic torque of a shell type needle bearing and a bush. It is a graph which shows the measurement result of the penetration oil quantity of a shell type needle bearing and a bush. It is a graph which compares and shows the outer-diameter roundness of a holder | retainer by molding conditions and the presence or absence of annealing treatment. It is a graph which shows the curvature amount of the seal ring by abrasion resistance processing. It is sectional drawing which shows the conventional shell type needle bearing. It is sectional drawing which shows the other conventional shell type needle bearing which has a seal ring by which it machined.

Explanation of symbols

30 Shell type needle bearing with seal ring 31 Shell 31a Raceway surface 31b, 31c Inward flange portion (flange portion) 32 Retainer 32a Pocket 32b End surface 33 of retainer Needle 34 Seal ring

Claims (5)

A shell having a raceway surface on an inner peripheral surface or an outer peripheral surface and flange portions on both ends;
A cage having a plurality of pockets in the circumferential direction;
A plurality of needles held in each of the pockets so as to be freely rollable along the raceway surface;
A cylindrical seal ring provided between the end face of the retainer and the flange portion inside or outside the shell;
A method for producing a shell-type needle roller bearing with a seal ring comprising:
The seal ring constitutes a floating seal,
The sealing ring molding step
A punching step of punching and forming a circular hole in a part of a metal plate as a material;
A burring process for forming a cylindrical portion by bending the circumference of the circular hole at right angles to the metal plate and over the entire circumference,
The cylindrical portion is compressed in the axial direction in a state where the outer peripheral surface of the cylindrical portion is constrained and at least a part of the inner peripheral surface is not constrained in the axial direction, and the outer diameter and the axial dimension of the cylindrical portion are predetermined. A dimensional regulation process that regulates the value and bulges the surplus radially inward to form a first intermediate cylindrical material;
By pushing a handling punch having an appropriate outer diameter into the inner diameter side of the first intermediate cylindrical material from one end side in the axial direction, surplus thickness present on the inner peripheral surface portion of the first intermediate cylindrical material is axially removed. Collecting on the other end side, having a surplus flange portion in the shape of an inward flange on the inner peripheral surface of the other end in the axial direction, a handling step to be a second intermediate cylindrical material,
By inserting a punching punch having an appropriate outer diameter inside the second intermediate cylindrical material, a surplus removal step for removing the surplus brim portion and making it a high-accuracy ring,
At any timing after the burring step, the cylindrical part or any intermediate cylindrical material made from the cylindrical part or the high-accuracy ring is separated from the metal plate, and a separation process;
A method for producing a shell-type needle bearing with a seal ring, comprising :   The metal plate that is the material of the seal ring is a long metal plate drawn from the coil,
  This metal plate is sent sequentially with the progress of the processing work of the seal ring without being cut over the entire width,
  In the detaching step, the cylindrical portion or any intermediate cylindrical material made from the cylindrical portion is separated from the metal plate, and the metal plate is changed from the metal plate to a part of the metal plate in the detaching step. The cylindrical portion or any intermediate cylindrical material that has been subjected to predetermined processing in a state where the second circular hole is cut out, and after finishing the predetermined processing, the second circular hole is again formed. Push it inward and send it to the next processing step with the metal plate,
The manufacturing method of the shell type needle bearing with a seal ring of Claim 1 characterized by the above-mentioned. The method of manufacturing a shell type needle bearing with a seal ring according to claim 1, wherein the seal ring is not heat-treated after the forming step . The method of manufacturing a shell type needle bearing with a seal ring according to claim 1, wherein the seal ring is subjected to wear resistance treatment after the forming step . The method for manufacturing a shell type needle bearing with a seal ring according to any one of claims 1 to 4 , wherein the cage is a resin cage.

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