JP2009279611A - Method for manufacturing cylindrical ring member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To actualize a manufacturing method for obtaining a cylindrical ring member having a desired axial-direction size so that a ring-shaped bearing ring material can be manufactured inexpensively, the ring-shaped bearing ring material being material for manufacturing, for example, an inner ring and an outer ring constituting a radial ball bearing. <P>SOLUTION: An intermediate material is prepared in which both axial-direction end parts of a first and a second cylinder parts 14 and 12 are coupled to each other with a coupling part 17, and in such a state that the position of the one end face of both axial-direction end faces of both cylinder parts 14 and 12 is regulated to a prescribed position, the other end face is pressurized with punches 25 and 28. Then, the axial-direction sizes of both cylinder parts 14 and 12 are regulated to respective prescribed values. Excess metal generated as a result is released diametrically. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The method for manufacturing a cylindrical ring according to the present invention is used for, for example, manufacturing a ring-shaped race ring material, which is a material for constructing an inner ring and an outer ring constituting a radial ball bearing, at a low cost.
In addition, radial ball bearings incorporating inner and outer rings made of such ring-shaped raceway materials are, for example, electric motors incorporated into various household electrical products such as electric vacuum cleaners and ventilation fans, or various auxiliary equipments for automobiles, etc. It is used for parts that do not require a high degree of rotational accuracy, such as the rotation support part. However, it can also be used to make inner and outer rings that can be used for applications requiring higher rotational accuracy by improving the accuracy of the processing apparatus.

  A radial ball bearing 1 as shown in FIG. 9 is incorporated in a rotation support portion of various rotating devices. This radial ball bearing 1 is of a single-row deep groove type, and has a plurality of balls 4, 4 installed between an outer ring 2 and an inner ring 3 arranged concentrically with each other. Of these, a deep groove type outer ring raceway 5 is formed on the axially intermediate portion of the inner peripheral surface of the outer ring 2, and a deep groove type inner ring raceway 6 is formed on the entire outer periphery of the inner ring 3. is doing. The balls 4 and 4 are arranged so as to roll between the outer ring raceway 5 and the inner ring raceway 6 while being held by a cage 7. With this configuration, the outer ring 2 and the inner ring 3 can be freely rotated relative to each other.

  For example, methods described in Patent Documents 1 and 2 are known as methods for producing the race rings such as the outer ring 2 and the inner ring 3 constituting the radial ball bearing 1 as described above at low cost. The methods described in both of these patent documents perform plastic working on a cylindrical billet obtained by cutting a long material made by rolling or the like to obtain one or a pair of cylindrical rings. A rolling process, a cutting process, a grinding process, and a heat treatment are performed on the cylindrical ring to form the raceway. For example, FIG. 10 shows an example of a method of obtaining a pair of cylindrical rings from one billet 8 considered prior to the present invention.

  In this method, a small diameter as shown in (B) is obtained by performing an upsetting process that crushes the billet 8 in the axial direction in a state where the outer diameter of the lower end of the billet 8 shown in (A) is constrained. A first intermediate material 11 composed of a portion 9 and a large diameter portion 10 is formed. Next, a forward extrusion process is performed on the small-diameter portion 9 and the small-diameter portion 9 is processed into a small-diameter second cylindrical portion 12 to obtain the second intermediate material 13 shown in FIG. Next, the large-diameter portion 10 is subjected to a backward extrusion process, and the large-diameter portion 10 is processed into a large-diameter first cylindrical portion 14 to obtain the third intermediate material 15 shown in FIG. Since all of the processes of (A) → (D) in FIG. 10 can be performed by cold forging, it is possible to ensure accuracy with respect to the radial dimension. However, since the axial lengths of the first and second cylindrical portions 14 and 12 are not particularly restricted, sufficient accuracy cannot be ensured.

On the other hand, in the case of making the raceway from the third intermediate material 15 as described above, the shape accuracy of the cylindrical ring produced by the plastic working is reduced in order to reduce the machining allowance at the time of the grinding process and to reduce the machining cost. It is preferable to make the dimensional accuracy as good as possible. For example, Patent Document 1 describes a method of letting surplus generated with plastic processing escape to the bottom of a bottomed cylindrical intermediate material, and finally punching out the bottom together with the surplus to form a cylindrical ring. . According to the invention described in Patent Document 1 as described above, the inner diameter and the outer diameter can be processed with high accuracy as in the case of the processing method shown in FIG. 10 described above, but the axial dimension is finished with high accuracy. I don't consider things. For this reason, there is a possibility that it takes extra time to remove the excess axial length by turning or the like. In order to adjust the axial dimension to an appropriate value by plastic working that can be performed in a shorter time than turning, the inner and outer diameters of the cylindrical ring are constrained in a later step, and this cylindrical ring is compressed from both axial end faces. It is also possible to adjust the height. However, since the volume of the cylindrical ring has not been adjusted in the previous step so as to obtain a desired axial dimension, there is no escape space for surplus generated by adjusting the axial dimension, and the desired dimension is eliminated. I can't get it.
In addition, there is Patent Document 3 as a publication describing the technology related to the present invention.

JP 2000-94080 A Japanese Patent No. 3720564 JP 2006-90407 A

  In view of the circumstances as described above, the present invention has a desired axial dimension so that, for example, a ring-shaped race ring material, which is a material for producing an inner ring and an outer ring constituting a radial ball bearing, can be produced at low cost. The present invention has been invented to realize a manufacturing method capable of obtaining a cylindrical ring member.

The manufacturing method of the cylindrical ring member of the present invention includes a first cylindrical portion made in the process of manufacturing a pair of cylindrical ring members having different diameters from a single material, and an axial direction from the first cylindrical portion. The second cylindrical portion, which is disposed concentrically with the first cylindrical portion at a position distant from the first cylindrical portion, and the axial ends of the first and second cylindrical portions are connected to each other. , With respect to the intermediate material provided with a connecting portion that exists in a direction perpendicular to the central axes of the first and second cylindrical portions, the axial direction of at least one of the first and second cylindrical portions The dimension is regulated to a predetermined dimension.
The manufacturing method of the cylindrical ring member of the present invention as described above is such that the position of one end surface of the two axial end surfaces of the cylindrical portion whose axial dimension should be restricted to a predetermined dimension is restricted to a predetermined position. The end face is pressed by a punch to a position separated from the predetermined position in the axial direction by the predetermined dimension. Then, the resulting surplus is released in the radial direction.

When such a method for producing a cylindrical ring member of the present invention is carried out, the one cylindrical portion is set as the second cylindrical portion, for example, as in the invention described in claims 2 to 4.
In the case of the invention described in claim 2, before separating the second cylindrical portion and the first cylindrical portion, it is opposite to the connecting portion in both axial end surfaces of the second cylindrical portion. The axial position of the side end face is restricted to a predetermined position. Further, the end surface on the connecting portion side of the second cylindrical portion is pressed by a punch while the inner and outer peripheral surfaces of the second cylindrical portion are constrained so as not to be displaced in the radial direction. Then, the excess meat is allowed to escape radially outward toward the connecting portion.

  In the case of the invention described in claim 3, the end portion on the side of the connecting portion among both end portions of the second cylindrical portion is closed by the bottom plate portion. Then, before separating the second cylindrical portion and the first cylindrical portion, the axial position of the end surface opposite to the connecting portion is restricted to a predetermined position among both axial end surfaces of the second cylindrical portion. To do. In addition, with the inner and outer peripheral surfaces of the second cylindrical portion restrained so as not to be displaced in the radial direction, the end surface on the connecting portion side of the second cylindrical portion is pressed by a ring punch. Then, the surplus meat is allowed to escape radially outward and inward toward the connecting portion and the bottom plate portion.

  Furthermore, in the case of the invention described in claim 4, it is assumed that the end portion on the side of the connecting portion is open among both end portions of the second cylindrical portion. Then, before separating the second cylindrical portion and the first cylindrical portion, the axial position of the end surface opposite to the connecting portion is restricted to a predetermined position among both axial end surfaces of the second cylindrical portion. To do. Further, the end surface of the second cylindrical portion on the connecting portion side is pressed by a punch while the outer peripheral surface of the second cylindrical portion is constrained so as not to be displaced radially outward. Then, the surplus is allowed to escape radially inward of the second cylindrical portion.

Or when implementing the manufacturing method of the cylindrical ring member of this invention which was mentioned above, said one cylindrical part is made into the 1st cylindrical part like the invention described in Claims 5-6, for example.
In the case of the invention described in claim 5, the axial position of the end face on the connecting part side is restricted to a predetermined position among the axial end faces of the first cylindrical part. Further, with the inner and outer peripheral surfaces of the first cylindrical portion being constrained so as not to be displaced in the radial direction, the end surface opposite to the connecting portion of the first cylindrical portion is pressed with a punch. Then, the surplus material is allowed to escape radially inward toward the connecting portion.

  In the case of the invention described in claim 6, the axial position of the end face on the connecting part side is restricted to a predetermined position among the both axial end faces of the first cylindrical part. Further, the end surface of the first cylindrical portion opposite to the connecting portion is pressed with a punch while the outer peripheral surface of the first cylindrical portion is constrained so as not to be displaced radially outward. Then, the excess meat is allowed to escape radially inward of the first cylindrical portion.

When the present invention is carried out, preferably, as in the invention described in claim 7, the axial dimension of the second cylindrical portion is restricted to a predetermined size, and at the same time, the axial end surface of the second cylindrical portion is A curved surface having an arc cross section is formed over the entire circumference on the inner periphery.
Alternatively, as in the invention described in claim 8, the axial dimension of the first cylindrical portion is restricted to a predetermined size, and at the same time, a curved surface having an arc-shaped cross section is entirely formed on the outer peripheral edge of the axial end surface of the first cylindrical portion. Form around the circumference.

  According to the manufacturing method of the cylindrical ring member of the present invention configured as described above, for example, a ring-shaped bearing ring material, which is a material for manufacturing an inner ring and an outer ring constituting a radial ball bearing, can be manufactured at low cost. A cylindrical ring member having a desired axial dimension can be obtained. In the case of the present invention, a pair of cylindrical ring members having different diameters, which are processed into an inner ring and an outer ring, respectively, are made from a single material. Compared with the method of making one cylindrical ring from one material, the ratio of scrap per cylindrical ring can be reduced, and the cost can be reduced by improving the material yield.

[First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1, 3, and 6-8. In the case of this example, for example, after restricting the axial dimension of the second cylindrical part 12 constituting the third intermediate material 15 made by the method shown in FIG. 10 to a desired value, the second cylindrical part 12 is The first cylindrical portion 14 is separated from the first cylindrical portion 14, and before and after the separation operation, the axial dimension of the first cylindrical portion 14 is regulated to a desired value. Since the manufacturing method and the shape of the third intermediate material 15 are as described above with reference to FIG. 10, redundant description will be omitted, and the following description will be made in order of steps with a focus on the features of this example. Further, the vertical direction is represented by the vertical direction in FIG. 1, which coincides with the vertical direction during processing.

"First step"
In this first step, first, as shown in FIG. 1A, the third intermediate material 15 is placed on a die 16 having a stepped cylindrical surface on the inner peripheral surface without any radial gap (outside in the radial direction). (With the displacement to the direction blocked). In this state, the lower surface of the connecting portion 17 that connects the first and second cylindrical portions 14 and 12 constituting the third intermediate material 15 is provided at the stepped surface provided in the intermediate portion in the axial direction of the die 16. 18 is placed without any gap (in a state in which downward displacement is prevented). Further, a cylindrical mandrel 19 and a cylindrical counter ring 20 are inserted into the lower half inner diameter side of the die 16 from below. Of these, the front end surface (upper end surface) of the mandrel 19 is slightly placed on the lower surface of the bottom plate portion 21 that continuously extends radially inward from the connecting portion 17 and closes the upper end opening of the second cylindrical portion 12. Adjacent to each other through the gap.

  At the upper end of the mandrel 19, there is a small-diameter portion 22 that can be inserted into the second cylindrical portion 12 without a gap (in a state in which the second cylindrical portion 12 is prevented from being displaced radially inward), A large-diameter portion 23 having an outer diameter larger than the inner diameter of the second cylindrical portion 12 but smaller than the outer diameter of the second cylindrical portion 12, and an upper end of the large-diameter portion 23 and a lower end portion of the small-diameter portion 22 are continuously connected. The curved surface portion 24 having a circular arc shape such as a quarter arc is formed. Then, the curved surface portion 24 is brought into contact with or opposed to a portion near the inner diameter of the lower end surface of the second cylindrical portion 12. Further, the upper end surface of the counter ring 20 is disposed around the large diameter portion 23 of the mandrel 19. The height position of the upper end surface of the counter ring 20 is made to coincide with the height position of the upper end of the large diameter portion 23 (the lower end portion of the curved surface portion 24). Therefore, the upper end surface of the counter ring 20 abuts or is close to the outer diameter portion of the lower end surface of the second cylindrical portion 12.

  In the first step, the third intermediate material 15 is fitted into the die 16 having the shape as described above, and the mandrel 19 and the counter ring 20 as described above are brought into contact with the lower end surface of the second cylindrical portion 12. Alternatively, the upper end surface of the second cylindrical portion 12 is pressed downward by the punch 25 in a state of being opposed to each other. The punch 25 has a cylindrical shape at least at the tip (in the example shown in the figure), and is formed with a ridge 26 on the inner peripheral edge of the lower end surface over the entire circumference. The outer peripheral surface of the ridge 26 is a curved surface having a circular cross section, and is smoothly connected to the outer diameter portion of the lower end surface. Such a punch 25 is lowered in a state of being fixed to a ram of a press machine, and a portion corresponding to the upper end surface of the second cylindrical portion 12 at the radial intermediate portion of the upper surface of the third intermediate material 15 is lowered. Press strongly. The lowering amount of the punch 25 is set until the distance between the outer diameter portion of the lower end surface of the punch 25 and the upper end surface of the counter ring 20 reaches a desired length.

  If the punch 25 is lowered by the above-mentioned descending amount and the portion corresponding to the upper end surface of the second cylindrical portion 12 is strongly pressed downward at the radial intermediate portion of the upper surface of the third intermediate material 15, the second cylinder The axial length (vertical height) of the portion closer to the outer diameter of the portion 12 becomes the desired length (the axial dimension is reduced). The surplus extruded as the axial length of the second cylindrical portion 12 shrinks escapes to the connecting portion 17 and the bottom plate portion 21. At the same time, a chamfered portion (curved surface portion) having an arcuate cross section is formed at a portion corresponding to the continuous portion between the both axial end surfaces of the second cylindrical portion 12 and the inner peripheral surface.

"Second step"
In the second step, the axial length of the first cylindrical portion 14 is restricted to a predetermined size, and at the same time, a cross-sectional circle is formed on the continuous portion between the lower end portion of the outer peripheral surface of the first cylindrical portion 14 and the lower end surface in the axial direction. An arc-shaped chamfered portion (curved surface portion) is formed, and the bottom plate portion 21 is further punched out. For this purpose, as shown in FIG. 1B, the intermediate material A processed in the first step described above is transferred to another die 16a. The shape of the die 16a is substantially the same as that of the die 16 used in the first step described above. However, in the case of the die 16a used in the second step, a curved surface portion 27 having a circular cross section is formed in a continuous portion between the upper half portion of the inner peripheral surface and the outer peripheral edge portion of the step surface 18a. .

  In this step, the intermediate material A is set on the die 16a, and then a forming punch 28 and a punching punch 29 are inserted into the die 16a from above. Of these, the forming punch 28 is annular and is lowered while being fixed to a ram of a press machine, and strongly presses the upper end surface of the first cylindrical portion 14 of the intermediate material A toward the step surface 18a. Such a lowering amount of the forming punch 28 is set until the distance between the lower end surface of the forming punch 28 and the stepped surface 18a reaches a desired length. That is, by lowering the molding punch 28 by a desired amount, the axial length of the first cylindrical portion 14 is regulated to a desired length, and the resulting surplus is in the radial direction of the first cylindrical portion 14. Move inward. That is, the inner peripheral surface of the first cylindrical portion 14 is expanded radially inward. At the same time, a chamfered portion (curved surface portion) whose cross-sectional shape is an arc shape is formed in a continuous portion between the outer peripheral surface and the lower end surface of the first cylindrical portion 14. The punching punch 29 is formed by inserting the forming punch 28 in the vertical direction, and punches the bottom plate portion 21. In this punching process, the lower end surface of the second cylindrical portion 12 is supported by the upper end surface of the cylindrical counter ring 30 to prevent the deformation of the second cylindrical portion 12.

"Third process"
In this third step, as shown in FIG. 1C, the die 31 and the counter ring 32, which are each cylindrical and concentrically combined with each other with no gap, are processed in the second step described above. The lower surface of the connecting portion 17 of the intermediate material B is supported. Then, from this state, a punch 33 having an outer diameter matching the outer diameter of the second cylindrical portion 12 is inserted into the die 31 from above. The second cylindrical portion 12 is punched out by the outer peripheral edge of the lower end surface of the punch 33 and the inner peripheral edge of the upper end surface of the counter ring 32. Since the second cylindrical portion 12 is processed into a desired length in the first step described above, it is used as a ring-shaped raceway material for inner ring processing as it is.

"Fourth process"
The remaining intermediate material C from which the second cylindrical portion 12 has been separated in the third step described above is turned upside down and fed to the fourth step, and in this fourth step, the end of the first cylindrical portion 14 {FIG. (C) lower end portion, (D) upper end portion}. That is, as shown in FIG. 1D, while the intermediate material C is fitted in the die 34 and supported by the counter punch 35, the punch 36 is pushed into the inner diameter side of the first cylindrical portion 14, The connecting portion 17 is moved (handled) while being crushed from the top to the bottom of FIG. At this time, the shape of the portion of the inner peripheral surface of the die 34 continuing from the upper end surface of the counter punch 35 is transferred to the outer peripheral surface end portion of the first cylindrical portion 14. As a result, in combination with the second step, a chamfered portion (curved surface portion) having an arcuate cross section is formed at each continuous portion of the outer peripheral surface both ends and the axial end surfaces of the first cylindrical portion 14.

"Fifth process"
In the fifth step, the flange portion 37 remaining at the lower end portion of the intermediate material D obtained in the fourth step is punched and removed. For this purpose, as shown in FIG. 1E, the intermediate material D is transferred to a punching die 38 provided with a knockout ring 40, and the flange 37 is punched by a punching punch 39. Thereafter, the knockout ring 40 is raised and the remaining first cylindrical portion 14 is taken out from the punching die 38. Since the first cylindrical portion 14 is processed into a desired length in the second step described above, the first cylindrical portion 14 is a ring-shaped raceway material for outer ring processing.

[Second Example of Embodiment]
FIG. 2 shows a second example of an embodiment of the present invention corresponding to claims 1, 2, and 6-8. Even in the case of this example, it will be described below in the order of steps.
"First step"
First, as shown in (A), the bottom plate portion 21 constituting the third intermediate material 15 as shown in (D) of FIG. 10 is punched and removed. The connecting portion 17 that connects the first and second cylindrical portions 14 and 12 is left as it is.

"Second step"
The intermediate material composed of the first and second cylindrical portions 14 and 12 and the connecting portion 17 as described above is formed by the die shown in FIG. 1B as shown in FIG. It fits in the same die 16b as 16a, and supports the front end surface (lower end surface) of the second cylindrical portion 12 by a counter ring 30a similar to the counter ring 30 shown in FIG. Then, in this state, the second cylindrical portion 12 is pressed in the axial direction by the punch 41, and the axial dimension of the second cylindrical portion 12 is allowed to escape radially outward toward the connecting portion 17. Is regulated to a desired value.

  The punch 41 includes the punch 25 shown in FIG. 1A described above as a solid body, and has a core portion 42 that can be inserted into the second cylindrical portion 12 without a gap at the center of the tip surface. The punch 41 inserts the core portion 42 into the second cylindrical portion 12 to prevent the inner diameter of the second cylindrical portion 12 from expanding, and the tip end surface (upper end surface) of the counter ring 30a. The axial dimension of the second cylindrical portion 12 is set to a predetermined value. At this time, surplus material pushed out from between the punch 41 and the counter ring 30 a moves to the connecting portion 17.

"Third process"
If the axial dimension of the second cylindrical portion 12 is set to a predetermined value, then, as shown in FIG. 2C, the first cylindrical portion is similar to the case of FIG. 14 is pressed in the axial direction so that the axial dimension of the first cylindrical portion 14 is set to a desired value, and the surplus wall is moved to the inner diameter side of the first cylindrical portion 14. The inner peripheral surface is inflated radially inward.
"4th-6th process"
Next, as in (C) → (D) → (E) of FIG. 1 described above, as shown in FIG. 2 (D) → (E) → (F), the separation of the second cylindrical portion 12 → Handling of the inner diameter surface of the first cylindrical portion 14 → punching of the flange portion is performed to obtain ring-shaped raceway materials for processing inner and outer rings each having a desired axial dimension.
In the case of this example as well, an end face of a ring-shaped raceway ring material for inner and outer ring machining is provided by providing a receiving part having a circular cross section in a part of a die (punch, die) used in each process. A chamfered portion having an arc shape in cross section is formed at the peripheral edge.

[Third example of embodiment]
FIG. 3 shows a third example of the embodiment of the invention corresponding to claims 1, 4, 5, 7 and 8. Even in the case of this example, it will be described below in the order of steps.
"First step"
First, as in the second example of the embodiment described above, as shown in (A), the bottom plate portion 21 constituting the third intermediate material 15 as shown in FIG. 10 (D) is punched and removed. The connecting portion 17 that connects the first and second cylindrical portions 14 and 12 is left as it is.

"Second step"
Next, as shown in (B), while the intermediate material is fitted in the die 16c, the tip end of the punch 25a is suppressed while suppressing the tip end surface (lower end surface) of the second cylindrical portion 12 by the mandrel 19a and the counter ring 20a. The base end surface (upper end surface) of the second cylindrical portion 12 is pressed by the surface (lower end surface), and the axial length of the second cylindrical portion 12 is set to a predetermined value. The surplus wall is moved to the inner diameter side of the second cylindrical portion 12 and the inner peripheral surface of the second cylindrical portion 12 is expanded radially inward. At the same time, a curved surface having a circular cross section is formed over the entire circumference at a continuous portion between the inner peripheral surface of the second cylindrical portion 12 and both end surfaces in the axial direction.

"Third process"
Next, as shown in (C), the shaving punch 43 is pushed into the second cylindrical portion 12 while suppressing the outer peripheral surface and the lower surface of the intermediate material with the die 16d and the counter ring 20b. Scrap off surplus meat on the inner surface. Further, with the inner peripheral surface of the first cylindrical portion 14 held by a cylindrical mandrel 44, the tip surface (upper end surface) of the first cylindrical portion 14 is pressed by a ring punch 45, and the first cylinder The axial length of the portion 14 is set to a predetermined value. At this time, the surplus is released toward the inner diameter side toward the connecting portion 17. For this purpose, a gap is provided between the upper surface of the connecting portion 17 and the lower end surface of the mandrel 44 so as to receive the surplus.

"4th-6th process"
Next, as in (C) → (D) → (E) of FIG. 1 described above, as shown in FIG. 3 (D) → (E) → (F), separation of the second cylindrical portion 12 → Handling of the inner diameter surface of the first cylindrical portion 14 → punching of the flange portion is performed to obtain ring-shaped raceway materials for processing inner and outer rings each having a desired axial dimension.
In the case of this example as well, an end face of a ring-shaped raceway ring material for inner and outer ring machining is provided by providing a receiving part having a circular cross section in a part of a die (punch, die) used in each process. A chamfered portion having an arc shape in cross section is formed at the peripheral edge.

[Fourth Example of Embodiment]
FIG. 4 shows a fourth example of the embodiment of the invention corresponding to claims 1, 2, 5, 7 and 8. Even in the case of this example, it will be described below in the order of steps.
"First step"
First, as shown in (A), the third intermediate material 15 as shown in (D) of FIG. 10 is replaced with a stepped cylindrical die similar to the case of the first example of the embodiment described above. The cylindrical mandrel 19 and the cylindrical counter ring 20 are inserted from below into the lower half inner diameter side of the die 16. Then, as in the case of the third example described above, the second cylindrical portion 12 is pressed in the axial direction between the lower end surface of the punch 25a which is a solid body and the upper end surfaces of the mandrel 19 and the counter ring 20, The axial dimension of the second cylindrical portion 12 is set to a predetermined value. At this time, the bottom plate portion 21 of the third intermediate material 15 is also crushed between the mandrel 19 and the punch 25a. Then, the surplus generated as the bottom plate portion 21 and the second cylindrical portion 12 are crushed escapes outward in the radial direction toward the connecting portion 17. At the same time, the mandrel 19 and the punch 25a form a curved surface having a circular cross section at the continuous portion between the axial end surfaces of the second cylindrical portion 12 and the inner peripheral surface.

"Second to third steps"
Next, in the second step, as shown in (B), the bottom plate portion 21 which is crushed and thinned between the mandrel 19 and the punch 25a is punched and removed, and then as shown in (C). The second cylindrical portion 12 is separated from the first cylindrical portion 14 and the connecting portion 17. At this time, a curved surface having a circular cross section can be formed in a continuous portion between the axial end surface (lower end surface) and the outer peripheral surface of the first cylindrical portion 14.

"Fourth process"
Next, in order to restrict the axial dimension of the first cylindrical part 14 separated from the second cylindrical part 12 to a predetermined dimension, as shown in FIG. Press from both sides. In this operation, the first cylindrical portion 14 with the connecting portion 17 being joined is fitted into the die 46, and the connecting portion 17 is placed in the back so as to be internally fitted. The first cylindrical portion 14 and the connecting portion 17 are supported by the counter punch 47, and the first cylindrical portion 14 is moved to the counter by the ring punch 49 while the mandrel 48 is inserted into the first cylindrical portion 14. This is performed by pressing the punch 47 to a predetermined length. The excess meat is released toward the inner diameter side toward the connecting portion 17. For this reason, a gap for receiving the surplus space is interposed between the upper surface of the connecting portion 17 and the front end surface (lower end surface) of the mandrel 48. Further, when the axial dimension of the first cylindrical portion 14 is regulated in this way, a curved surface having a circular arc cross section is formed at a continuous portion between one end portion (lower end portion) and the outer peripheral surface of the first cylindrical portion 14. Forming part.
If it is not possible to secure the connecting portion 17 from which the surplus is allowed to escape, the first cylindrical portion 14 is compressed in the axial direction without restricting a part of the inner diameter or the outer diameter of the first cylindrical portion 14. However, it is also possible to escape the surplus meat to this non-restrained part.

"Fifth to sixth steps"
Next, as shown in (E) → (F) of FIG. 4, the inner diameter surface of the first cylindrical portion 14 is handled → the punched portion is punched, and each of the inner and outer rings has a desired axial dimension. Get the ring-shaped raceway material. However, when the inner diameter of the first cylindrical portion 14 is finished in the fourth step described above, the fifth step shown in FIG. In the sixth step, a curved surface portion having an arcuate cross section can be formed in a continuous portion between the lower end surface and the outer peripheral surface of the first cylindrical portion 14. When the inner diameter of the first cylindrical portion 14 is finished in the fourth step, the metal material to be punched in the sixth step does not include the connecting portion 17 minutes. Only surplus resulting from the adjustment.

[Fifth Example of Embodiment]
FIG. 5 shows a fifth example of the embodiment of the invention corresponding to claims 1, 3 and 6 to 8. In the case of this example, with respect to the first example shown in FIG. 1 described above, the step of punching the bottom plate portion 21, the step of separating the first and second cylindrical portions 14, 12, The process of regulating the axial dimension to a predetermined dimension is changed. That is, in the case of this example, in FIG. 5A, the axial dimension of the second cylindrical portion 12 is determined in the same manner as in the first step of the first example shown in FIG. In addition to restricting the size, a curved surface portion is formed in a portion corresponding to a continuous portion between the axial end surfaces of the second cylindrical portion 12 and the inner peripheral surface.

  Thereafter, as shown in FIG. 5 (B), the bottom plate portion 21 is punched, and at the same time, a curved surface portion is formed in a continuous portion between one axial end surface (lower end surface) and the outer peripheral surface of the first cylindrical portion 14. Then, as shown in FIG. 5C, the first and second cylindrical portions 14 and 12 are separated. After that, as shown in FIG. 5D, the axial dimension of the first cylindrical portion 14 is regulated to a predetermined dimension in the same manner as the third step of the embodiment described above, As shown in E) → (F), handling of the inner diameter surface of the first cylindrical portion 14 → punching of the flange portion, and ring-shaped raceway materials for processing inner and outer rings each having a desired axial dimension Get. During the handling process of the inner diameter surface of the first cylindrical portion 14, the curved surface portion is formed in a continuous portion between the axial end surface {the upper end surface of (D), the lower end surface of (E)} and the outer peripheral surface of the first cylindrical portion 14. Form.

[Sixth Example of Embodiment]
FIG. 6 shows a sixth example of an embodiment of the present invention corresponding to claims 1, 4 and 6 to 8. In the case of this example, first, at the same time as the first step shown in FIG. 6A, the bottom plate portion 21 of the third intermediate material 15 is punched out, and at the same time, the outer peripheral surface of the first cylindrical portion 14 and the connecting portion 17. A curved surface portion is formed in a continuous portion with the axial end surface on the side.

  Next, in the second step shown in FIG. 6B, the second cylindrical portion 12 is pressed (compressed) to a predetermined dimension in the axial direction, and the axial dimension of the second cylindrical portion 12 is regulated to the predetermined dimension. At the same time, a curved surface portion is formed at a continuous portion between the axial end surfaces of the second cylindrical portion 12 and the inner peripheral surface. The surplus wall escapes to the inner diameter side of the second cylindrical portion 12 and causes the inner peripheral surface of the second cylindrical portion 12 to expand radially inward.

Next, in the third step shown in FIG. 6C, the first cylindrical portion 14 is pressed (compressed) to a predetermined dimension in the axial direction, and the axial dimension of the first cylindrical portion 14 is set to the predetermined dimension. Simultaneously with the restriction, a curved surface portion is formed in a continuous portion of the first cylindrical portion 14 on the opposite side of the connecting portion 17 and the one axial end surface and the outer peripheral surface. The surplus wall escapes to the inner diameter side of the first cylindrical portion 14 and causes the inner peripheral surface of the first cylindrical portion 14 to swell radially inward. In this step, it is also possible to form a curved surface portion at a continuous portion between the axial end surface {the lower end surface of (C)} and the inner peripheral surface of the second cylindrical portion 12.
Thereafter, as shown in FIG. 6D, after the first and second cylindrical portions 14 and 12 are separated from each other, as shown in FIG. The excess of the inner peripheral surface of the second cylindrical portion 12 is handled, and the resulting collar portion is punched and removed. Next, as shown in (D) → (E) of FIG. 6, the connecting portion is handled, and the resulting flange portion 37 is punched and removed. At the time of punching and removal of the flange portion 37, a curved surface portion is formed in a continuous portion of the first cylindrical portion 14 between the other axial end surface (the lower end surface in FIG. 6E) and the outer peripheral surface.

[Seventh to eighth examples of the embodiment]
When practicing the present invention, the difference in diameter between the first and second cylindrical portions 14 and 12 is large. Therefore, the radial direction of the connecting portion 17 that connects the axial ends of both the cylindrical portions 14 and 12. When the dimension is large, as shown in FIG. 7 or FIG. 8, when the axial dimension of any one of the cylindrical parts 14 and 12 is restricted to a predetermined dimension, the extra space is allowed to escape to the connecting part 17. Can be configured.
First, in the example shown in FIG. 7, the connecting portion 17 remaining at the end of the first cylindrical portion 14 is elastically suppressed by the mandrel 50 and is pressed toward the lower mandrel 48 a by the ring punch 49. Then, the excess meat is allowed to escape toward the concave portion 51 provided at the center of the upper surface of the lower mandrel 48a.
Further, in the example shown in FIG. 8, the surplus generated as a result of the first cylindrical portion 14 being crushed in the axial direction in the concave portion 51 a formed near the inner diameter of the step surface 18 a of the die 16 e is released.

The manufacturing method of the cylindrical ring member of the present invention is not limited to the inner ring and the outer ring constituting the radial ball bearing, but includes the outer ring and the inner ring constituting various rolling bearings such as a cylindrical roller bearing, a tapered roller bearing, and a self-aligning roller bearing. It can be used for processing cylindrical ring members for manufacturing at low cost.
In addition, as a plastic working for producing an intermediate material (third intermediate material 15) having a pair of cylindrical ring members having different diameters from a single material, which is used when the present invention is carried out, there is a thermal process. Either cold forging or cold forging can be employed. Among them, the method described in Patent Document 2 can be adopted as an example of hot forging, and the method shown in FIG. 10 can be adopted as an example of cold forging. However, cold forging is preferable from the viewpoint of securing dimensional accuracy and suppressing the generation of a decarburized layer to reduce the machining allowance at the time of cutting.

Sectional drawing which shows the 1st example of embodiment of this invention in process order. Sectional drawing which shows the 2nd example in order of a process. Sectional drawing which shows the 3rd example in order of a process. Sectional drawing which shows the 4th example in order of a process. Sectional drawing which shows the 5th example in order of a process. Sectional drawing which shows the 6th example in order of a process. The figure equivalent to (D) of Drawing 4 showing the 1st example of another structure for letting out surplus meat. The figure equivalent to (C) of Drawing 3 showing the 2nd example. The partial cut perspective view which shows an example of the rolling bearing incorporating the outer ring | wheel and inner ring | wheel produced with the cylindrical ring member used as the object of the manufacturing method of this invention. Sectional drawing which shows an example of the process of forming an intermediate raw material prior to the process used as the characteristic of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radial ball bearing 2 Outer ring 3 Inner ring 4 Ball 5 Outer ring raceway 6 Inner ring raceway 7 Cage 8 Billet 9 Small diameter part 10 Large diameter part 11 First intermediate material 12 Second cylindrical part 13 Second intermediate material 14 First cylindrical part 15 First Three intermediate materials 16, 16a, 16b, 16c, 16d, 16e Dies 17 Connecting portion 18, 18a Step surface 19, 19a Mandrel 20, 20a, 20b Counter ring 21 Bottom plate portion 22 Small diameter portion 23 Large diameter portion 24 Curved surface portion 25, 25a Punch 26 Projection 27 Curved portion 28 Molding punch 29 Punch punch 30, 30a Counter ring 31 Die 32 Counter ring 33 Punch 34 Die 35 Counter punch 36 Punch 37 Hook 38 Punch die 39 Punch 40 Knockout ring 41 Punch 42 Core part 43 Chez Bobing punch 44 Mandrel 45 Ring punch 46 Dies 47 Counter punch 48, 48a Mandrel 49 Ring punch 50 Mandrel 51, 51a Recess

Claims (8)

  A first cylindrical portion made in the process of making a pair of cylindrical ring members having different diameters from a single material, and concentric with the first cylindrical portion at a position axially deviated from the first cylindrical portion. The center of these 1st and 2nd cylindrical parts which connect the axial direction edge part of these 2nd cylindrical parts with the 2nd cylindrical part smaller diameter than this 1st cylindrical part arrange | positioned in these A cylindrical ring member that restricts the axial dimension of at least one of the first and second cylindrical parts to a predetermined dimension with respect to an intermediate material provided with a connecting part that exists in a direction perpendicular to the axis. In the manufacturing method, the other end surface is controlled from the predetermined position by the punch while the position of one end surface of the both axial end surfaces of the cylindrical portion to be controlled to a predetermined size is restricted to the predetermined position. Press to the axially separated position by the predetermined dimension, and as a result Releasing the excess thickness Flip was radially manufacturing method of a cylindrical ring member.   One cylindrical part is the second cylindrical part, and before separating the second cylindrical part and the first cylindrical part, of the end faces on the opposite side of the connecting part among the axial end faces of the second cylindrical part. While restricting the axial position to a predetermined position and constraining the inner and outer peripheral surfaces of the second cylindrical portion so as not to be displaced in the radial direction, the end surface on the connecting portion side of the second cylindrical portion is pressed with a punch. The manufacturing method of the cylindrical ring member according to claim 1, wherein the surplus is allowed to escape radially outward toward the connecting portion.   One cylindrical part is the second cylindrical part, and the end part on the connecting part side is closed by the bottom plate part among both end parts of the second cylindrical part, and the second cylindrical part, the first cylindrical part, Before separating the second cylindrical portion, the axial position of the end surface on the opposite side of the connecting portion of the second cylindrical portion is restricted to a predetermined position, and both the inner and outer peripheral surfaces of the second cylindrical portion are set to have a diameter. In a state of being restrained so as not to be displaced in the direction, the end surface of the second cylindrical portion on the connecting portion side is pressed by a ring punch, and the surplus is directed radially outward and inward toward the connecting portion and the bottom plate portion. The manufacturing method of the cylindrical ring member of Claim 1 which escapes.   One cylindrical part is the second cylindrical part, and the end part on the connecting part side is open among both ends of the second cylindrical part, and before the second cylindrical part and the first cylindrical part are separated from each other In addition, the axial position of the end surface on the opposite side of the connecting portion among the both axial end surfaces of the second cylindrical portion is restricted to a predetermined position, and the outer peripheral surface of the second cylindrical portion is not displaced radially outward. 2. The cylindrical ring member according to claim 1, wherein the end surface on the connecting portion side of the second cylindrical portion is pressed by a punch in a state where the second cylindrical portion is constrained, and the surplus is allowed to escape radially inward of the second cylindrical portion. Manufacturing method.   One cylindrical part is the first cylindrical part, and the axial position of the end face on the connecting part side is restricted to a predetermined position among the axially opposite end faces of the first cylindrical part. In a state where the peripheral surface is constrained so as not to be displaced in the radial direction, the end surface on the opposite side of the connecting portion of the first cylindrical portion is pressed with a punch, and the surplus is released radially inward toward the connecting portion. Item 2. A method for producing a cylindrical ring member according to Item 1.   One cylindrical part is the first cylindrical part, and the axial position of the end face on the connecting part side is restricted to a predetermined position among both axial end faces of the first cylindrical part, and the outer peripheral surface of the first cylindrical part In a state where it is constrained so as not to be displaced radially outward, the end surface on the opposite side to the connecting portion of the first cylindrical portion is pressed with a punch, and the surplus is allowed to escape radially inward of the first cylindrical portion. The manufacturing method of the cylindrical ring member of Claim 1.   The axial dimension of the second cylindrical part is restricted to a predetermined dimension, and at the same time, a curved surface having an arc-shaped cross section is formed over the entire circumference on the inner peripheral edge of the axial end surface of the second cylindrical part. The manufacturing method of the cylindrical ring member described in any one of Claims 1.   The axial dimension of the first cylindrical part is regulated to a predetermined dimension, and at the same time, a curved surface having an arcuate cross section is formed over the entire circumference on the outer peripheral edge of the axial end surface of the first cylindrical part. The manufacturing method of the cylindrical ring member described in any one of Claims 1.

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