JP3282211B2 - Method for manufacturing metal ring body having shape change portion on outer periphery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal ring having a shape-change portion on its outer periphery, and more particularly to a technique for forming a metal ring-shaped material by rolling it between two forming rolls. It is.

[0002]

2. Description of the Related Art As an example of a method for manufacturing a metal ring used in a gas turbine engine, there is a technique described in Japanese Patent Publication No. 62-2889. The method of manufacturing the metal ring is to manufacture a nickel or cobalt-based metal ring by cold rolling using a plurality of pairs of roll dies. In the first rolling step, the material is mainly increased in the axial direction. The ring diameter is mainly increased by rolling with several pairs of roll dies. As shown in FIGS. 4 and 5, the concept of the method is such that the upper die and the lower die perform rolling while completely enclosing the cross section of the rolling ring. (1) With these techniques, the rolled metal ring can be manufactured to a tight tolerance without any subsequent machining or hot working, achieving a tolerance limit of ± 0.002 inches. (2) It is effective to perform a part of rolling at an early stage at an early stage and to quickly determine an axial shape early in a rolling operation. And so on.

[0003]

However, when examining a method of manufacturing such a metal ring, when rolling AMS5754 material used for a metal ring for a gas turbine engine, desired dimensional accuracy (tolerance) is obtained. In order to obtain, for example, 17 or more pairs of roll dies are required, the production cost of the roll dies increases, the labor for replacing the roll dies,
It has been found that there are still many problems to be improved in terms of elongation of the cold rolling process, increase in production costs in small-quantity production, and the like.

[0004] The present invention has been made in view of these problems, and achieves the following objects. (1) To efficiently manufacture a metal ring having a remarkable shape change portion on the outer periphery. (2) Significantly reduce the log of forming rolls to about two or three, thereby reducing labor and cost associated with manufacturing and handling forming rolls. (3) To improve the quality of the metal ring body.

[0005]

Means for solving these problems are proposed as means for solving these problems. The method of manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 1 is a method for forming a metal ring-shaped material having an inner diameter smaller than a desired dimension and an axial cross-sectional area larger than a desired cross-sectional area with an outer forming roll and an inner circumferential form. by feeding between the rolls, a method for producing a metal ring body having a shape changing portion to the outer periphery by rolling the ring body in a state in which with a gap between the axial end portions of the forming rolls, the bottom
Inner and outer forming rollers with flat supporting grooves
The metal ring-shaped material is fed between the metal ring-shaped material and an initial annular concave portion whose thickness in the radial direction is partially reduced on the outer peripheral surface of the metal ring-shaped material. There rows molded to the outer diameter and axial dimension smaller inner diameter than the desired shape is increased by increasing the axial dimension by applying a bi-directional compressive force, after the forming step of the ring body
To the process of finishing to the desired shape by machining
I am trying to be . According to a second aspect of the present invention, there is provided a method of manufacturing a metal ring body having a shape changing portion on an outer periphery, wherein a means for forming until one of an inner diameter, an outer diameter, and an axial dimension is close to a desired dimension is provided. To the manufacturing method. In the method for manufacturing a metal ring having a shape change portion on the outer periphery according to claim 3 , the means for providing the shape change portion on the outer periphery while suppressing the occurrence of the shape change on the inner periphery is described in claim 1 or 2 . The method is added to the method for manufacturing such a metal ring body. Method for producing a metal ring member on the outer periphery of the claim 4 having a shape changing unit, after the forming step of the ring body, means the step of dividing the ring body in the middle of the axial direction is added, claims 1 to 3 The method is added to the method for manufacturing a metal ring according to any one of the above. Claim
5. The method according to claim 5 , wherein the initial annular concave portion is formed at a central portion in the axial direction, wherein the metal ring body according to any one of claims 1 to 4. To the manufacturing method. Method for producing a metal ring body having a shape changing portion to the outer periphery according to claim 6, the metal ring member formed by the molding process, a means which is symmetrical in the axial direction, one of claims 1-5 one The method is added to the method for manufacturing a metal ring according to the above item . Method for producing a metal ring member on the outer periphery of the claim 7 having a shape-changing portion, while restraining the axial movement of the metal ring like material, means for forming an initial annular recess, claims 1-6
The method is added to the method for manufacturing a metal ring according to any one of the above. The method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 8 is such that the annular convex portion of the outer peripheral forming roll is engaged with the initial annular concave portion of the ring body to reduce the axial displacement of the ring body. The means for suppressing is defined in claim 1 to claim 7.
The method is added to the method for manufacturing a metal ring according to any one of the above. According to a ninth aspect of the present invention, in the method for manufacturing a metal ring body having a shape change portion on the outer circumference, after the middle-stage forming step, the inner circumferential surface is formed while the axial movement of the inner circumference of the ring body is free. Means according to any one of claims 1 to 8
The method is added to the method for manufacturing a metal ring according to any one of the above. A method of manufacturing a metal ring having a shape change portion on the outer periphery according to claim 10 is a method for manufacturing a metal ring in a state where the axial movement of the ring is restricted by a contact point between an inner peripheral surface of the ring and an inner peripheral forming roll. Means for forming the peripheral surface is added to the method for manufacturing a metal ring according to any one of claims 1 to 9 . The method for manufacturing a metal ring body having a shape-change portion on the outer periphery according to claim 11 includes means for forming a tapered surface having a larger diameter at an axial end portion on the inner peripheral surface . The method is added to the method for manufacturing a metal ring body according to the first aspect . The method of manufacturing a metal ring body having a shape-change portion on the outer periphery according to claim 12 includes the step of forming a tapered surface with a reduced diameter at the axial end on the inner peripheral surface . The method is added to the method for manufacturing a metal ring body according to the first aspect . The method for manufacturing a metal ring body having a shape-change portion on the outer periphery according to claim 13 includes a method in which compression molding is performed by cold rolling, and the method for manufacturing a metal ring body according to any one of claims 1 to 12. To be added. Claim 1
The method for manufacturing a metal ring body having a shape-change portion on the outer periphery according to claim 4 , wherein the means used also as the inner circumferential forming roll after the middle-stage forming step is the method for manufacturing a metal ring body according to any one of claims 1 to 13 . It is added to the manufacturing method. The method for manufacturing a metal ring having a shape-changing portion on the outer periphery according to claim 15 is characterized in that the metal ring is a hard material such as a component for a combustor of a gas turbine .
The method is added to the method for manufacturing a metal ring body according to the first aspect . A method for manufacturing a metal ring having a shape-changing portion on the outer periphery according to claim 16 , wherein the means for adding an intermediate annealing step during forming is a method for manufacturing a metal ring according to any one of claims 1 to 15. To be added. Claim
The method for manufacturing a metal ring body having a shape-changing portion on the outer periphery according to claim 17 , wherein the means for forming the shape-changing portion near both ends in the axial direction is a method of manufacturing the metal ring body according to any one of claims 1 to 16 . It is added to the manufacturing method. The method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 18 is a method according to any one of claims 1 to 17, wherein the shape change portion is formed near a position where the initial annular concave portion is formed. The method is added to the method for manufacturing such a metal ring body. Claim
Method for producing a metal ring body having a shape changing portion to the outer periphery of the 19, the step of detecting a diameter of the ring body at the end of the molding step, the metal ring body according to any one of claims 1 to 18 To the manufacturing method.

[0006]

In the manufacturing method according to the first aspect, when the ring is rolled, the axial dimension increases with an increase in the amount of compression, and the inner diameter increases because the gap is formed between the two forming rolls. As a result, the axial cross-sectional area is reduced. When the initial annular recess is first formed on the outer peripheral surface of the metal ring-shaped material and the compression is continued, the metal material divided by the initial annular recess is distributed to both sides in the axial direction. When the compressive force in the axial direction and the compressive force in both the radial direction are applied to the initial annular concave portion, the distributed material is further distributed in the axial direction by the compression in both the radial directions, and has a shape change portion on the outer periphery. A ring body is formed. Machining
By forming to the state where the margin has been left,
The flexibility of the shape and dimensions is increased and the formability is enhanced.
When unnecessary parts are removed by adding mechanical processing
In both cases, finishing work is enhanced. According to the manufacturing method of the second aspect, in addition to the operation of the first aspect, the limit of molding is managed by one of the inner diameter, the outer diameter, and the axial dimension,
In places that are out of the desired shape and dimensions,
Processing by a method other than molding is performed. According to the manufacturing method of the third aspect , in addition to the effect of the first or second aspect , the occurrence of a change in the shape of the inner peripheral portion during molding is suppressed, so that the metal material corresponding to the plastic deformation caused by the compression is reduced. It becomes easy to shift to the shape change portion of the portion and both ends of the shaft. According to the manufacturing method of the fourth aspect , in addition to the operation of the first to third aspects, by cutting out from the portion of the initial annular concave portion formed at the beginning of the forming step, two metals are formed in a series of forming steps. A ring body is obtained. According to the manufacturing method of the fifth aspect , in addition to the operation of the first to fourth aspects, the initial annular concave portion is formed at the central portion in the axial direction.
The occurrence of a phenomenon in which the ring body is displaced in the axial direction during molding is suppressed, and the metal material is distributed in the axial direction almost equally. Claim
According to the manufacturing method of the sixth aspect , in addition to the functions of the first to fifth aspects , two metal ring bodies having the same shape are formed by a single forming step, and in this case, material distribution in the axial direction during the forming step. And the compressive force is evenly distributed on both sides of the axial center. If it is the manufacturing method according to claim 7, in addition to the effects of claims 1 to 6, a desired position of the metal ring-shaped material, the initial annular recess is formed, the position of the initial annular recess portion is then Is a reference for forming the annular concave portion. According to the manufacturing method of the eighth aspect , in addition to the effects of the first to seventh aspects , the tip of the annular convex portion of the subsequent outer peripheral forming roll engages with the initial annular concave portion formed by the outer peripheral forming roll. Thus, the forming is continued without causing the ring body to shift in the axial direction, and the depth and the width of the initial annular concave portion are increased. According to the manufacturing method of claim 9 , in addition to the effects of claims 1 to 8 ,
The transfer of the material caused by the radial compression in the molding process after the middle-stage molding process is performed smoothly in the vicinity of the inner peripheral surface, thereby facilitating the molding of the inner peripheral surface. According to the manufacturing method of the tenth aspect, in addition to the functions of the first to ninth aspects, the contact surface of the inner peripheral forming roll is engaged with the inner peripheral surface of the ring body, so that the axial direction of the ring body The movement is suppressed, and the occurrence of the phenomenon that the entire ring body is shifted in the axial direction is suppressed. If it is the manufacturing method according to claim 11, claim 1
In addition to the operation of the above, the formation of a tapered surface with a large diameter at the end on the inner periphery makes it easier for the metal material to move outward in the radial direction, and the formability of the shape change portion on the outer periphery near the end is improved. Is improved. According to the manufacturing method of the twelfth aspect , in addition to the effects of the first to eleventh aspects, by forming a tapered surface having a small diameter at the end portion on the inner periphery, the metal material in the vicinity of the axial center portion is reduced It is easy to move outward, and the formability of the shape change portion on the outer peripheral surface near the center in the axial direction is improved. According to the manufacturing method of claim 13 , in addition to the effects of claims 1 to 12 , the transformation of the metal structure is suppressed by performing the entire forming step by compression molding by cold rolling, and the uniform metal ring is formed. Is molded. The manufacturing method according to claim 14 is the claim.
In addition to the effects of 1 to 13, the number of entire forming rolls can be reduced by also using the inner circumferential forming rolls. Claim
According to the manufacturing method of the fifteenth aspect , in addition to the effects of the first to fourteenth aspects, the applicability to hard materials such as combustor components is enhanced. According to the manufacturing method of claim 16 ,
In addition to the effects of Nos. 1 to 15 , when the structure is hardened by molding, the structure is returned to a structure before rolling that does not cause transformation by annealing. The hardened portion of the metal structure is eliminated by the intermediate annealing, and the subsequent forming process is facilitated by the disappearance of the hardened portion. According to the manufacturing method of the seventeenth aspect , in addition to the effects of the first to sixteenth aspects , the material is distributed to the axial end by the formation and expansion of the annular recess near the center in the axial direction. It is. Claim 1
According to the manufacturing method of the eighth aspect , in addition to the effects of the first to seventeenth aspects , when the annular concave portion is formed near the center in the axial direction, the metal material moved to both sides thereof is used to change the shape in the subsequent process. The portion is formed, and the moldability near the position where the annular concave portion is formed is improved. According to the manufacturing method of the nineteenth aspect , in addition to the effects of the first to eighteenth aspects , the forming limit of the ring body is managed by detecting the diameter.

[0007]

1 to 6 show a first example of a manufacturing process of a method for manufacturing a metal ring having a shape change portion on the outer periphery according to the present invention.
It shows an embodiment. In each of these figures, reference numeral 1 denotes a metal ring-shaped material (ring), 2 denotes an initial formed body (ring), 3 denotes an intermediate formed body (ring), 4 denotes a final formed body (ring), 5 Is a finished ring body, 11 is a rough forming roll for outer circumference (outer forming roll), 12 is an intermediate forming roll for outer circumference (outer forming roll), 13 is a finish forming roll for outer circumference (outer forming roll), 21 is a rough forming roll for inner circumference. A forming roll (inner peripheral forming roll), 22 is an inner peripheral intermediate forming roll (inner peripheral forming roll), and 23 is an inner peripheral finishing forming roll (inner peripheral forming roll).

[Metal Ring Material] The metal ring material 1 is made of, for example, the above-mentioned AM5754 material, and as shown in FIG. 1, an axial cross section having an outer diameter of 381 mm, an inner diameter of 355 mm, and an axial dimension of 48 mm. Those having a rectangular shape are applied. The metal ring-shaped material 1 has a smaller inner diameter and a larger axial cross-sectional area than the final molded body 4 and the completed ring body 5 indicated by the solid line and the broken line in FIG.

[Outline of Manufacturing Process] Metal ring body having a shape-change portion on the outer periphery (final molded body 4 or completed ring body 5)
In the manufacturing process, the metal ring-shaped material 1 is fed between a pair of forming rolls (an outer peripheral rough forming roll 11 and an inner peripheral rough forming roll 21) shown in FIG. The initial forming step and the initial formed body (ring body) 2 obtained in the initial forming step are fed between a pair of forming rolls (an outer peripheral intermediate forming roll 12 and an inner peripheral intermediate forming roll 22) shown in FIG. The intermediate forming step (ring body) 3 obtained in the middle-stage forming step of compressing the intermediate forming body and the intermediate forming body (ring body)
3 and a mechanical finishing step of removing the excess portion of the final molded body 4 obtained in the final molding step. As shown in FIG. 6, forming by rolling and mechanical finishing are performed.

In the forming step using each forming roll, the object to be formed in the first embodiment is hard, for example, A
Since it is M5754 material, it is carried out by cold rolling so as not to cause transformation of the metal structure, and a plurality of intermediate annealing steps are inserted in the middle of the forming process to eliminate the hardened portion of the metal structure. Thus, the subsequent moldability is improved.

[Forming Roll Applied to the Implementation of the Method] In the case of carrying out a method of manufacturing a metal ring body having a shape changing portion on the outer periphery, for example, three pairs of forming rolls shown in FIGS. 2 to 4 are applied. You.

As shown in FIG. 2, the outer peripheral rough forming roll (outer peripheral forming roll) 11 has an annular convex portion 11a located at the center in the axial direction and forming cavities 11b on both sides in the axial direction. , And tapered surfaces 11c located on both sides of the annular convex portion 11a.
a is set so as to have a cylindrical surface parallel to the axial direction.

As shown in FIG. 3, even in the outer peripheral intermediate forming roll (outer peripheral forming roll) 12, the annular convex portion 12a located at the center in the axial direction and the forming cavities 12b on both axial sides are formed. The annular convex portion 12a is formed into a two-step mountain shape, and the molded cavity 12b is formed.
, An outer peripheral forming portion 12c and an edge forming portion 12d are arranged.

As shown in FIG. 4, even the outer peripheral finish forming roll (outer peripheral forming roll) 13 has an annular convex portion 13a located at the center in the axial direction, and forming cavities 13b on both axial sides. Outer peripheral forming part 13c and edge forming part 13
d is arranged, and the width dimension (axial dimension) of the annular convex portion 13a is set to be larger than the annular convex portion 12a of the outer peripheral intermediate forming roll 12.

As shown in FIG. 2, the inner circumferential rough forming roll (inner circumferential forming roll) 21 is formed with a support groove 21a having a flat bottom.

As shown in FIG. 3, the inner peripheral intermediate forming roll (inner peripheral forming roll) 22 is symmetrical in the axial direction and has a recessed central portion (reduced radius). Is formed.

The inner peripheral finish forming roll (inner peripheral forming roll) 23 also has a tapered forming surface 23a which is symmetrical in the axial direction and has a concave central portion as shown in FIG. However, the inner peripheral intermediate forming roll 22 shown in FIG.
, That is, they can be shared.

[Initial molding step] In the initial molding step, FIG.
As shown in the figure, the forming is performed in a state where the metal ring-shaped material 1 is fed between the outer peripheral rough forming roll 11 and the inner peripheral rough forming roll 21. For example, 50 times to 500 times
The initial compact 2 shown in FIG. 3 is obtained by repeating the rolling three times, preferably about 300 times.

As shown in FIG. 2, a metal ring-shaped material 1
The contact pressure between the outer peripheral surface of the metal ring-shaped material 1 and the annular convex portion 11a of the outer peripheral rough forming roll 11 is adjusted in a state where the inner peripheral portion is engaged with the support groove 21a of the inner peripheral rough forming roll 21. When it is raised, an initial annular concave portion 2a indicated by a chain line in FIG. 2 is formed. In this case, the axial displacement of the metal ring-shaped material 1 is suppressed by the support groove 21a, so that the metal ring-shaped material 1 is initially located at a desired position on the outer peripheral surface of the metal ring-shaped material 1, that is, in the center in FIG. An annular recess 2a is formed.

When the formation of the initial annular concave portion 2a proceeds, plastic deformation occurs in a portion where the contact pressure is high, and the support groove 2a is formed.
Since the bottom surface of 1a is cylindrical, the metal material is transferred and distributed mainly in the direction orthogonal to the contact surface of the outer peripheral rough forming roll 11 with the annular convex portion 11a. In addition, since a gap is formed between the two forming rolls 11.21 and the metal ring-shaped material 1 is allowed to expand and deform in the axial direction, the metal ring-shaped material 1
In the axial direction and the inner diameter of the steel sheet tend to increase and the sectional area in the axial direction gradually decreases.

As described above, when the formation of the initial annular concave portion 2a on the outer peripheral portion of the metal ring-shaped material 1 is continued, an equal amount of material is distributed on both sides in the axial direction, and the initial annular forming process is formed. In the initial compact 2, as shown in FIG. 3, a large amount of material distribution (transfer of metal material) is performed on both sides of the initial annular concave portion 2a and near the outer peripheral portion.

[Mid-term molding step] In the middle-term molding step, FIG.
As shown in the figure, the initial molded body 2 obtained in the initial molding step
Is formed between the outer peripheral intermediate forming roll 12 and the inner peripheral intermediate forming roll 22. For example, the intermediate formed body 3 shown in FIG. 4 is obtained by repeating the rolling of 50 to 500 times, preferably about 300 times.

As shown in FIG. 3, the inner peripheral portion of the initial compact 2 is tapered to a tapered forming surface 22a of an intermediate forming roll 22 for the inner periphery.
And the initial annular recess 2a of the initial compact 2
In the state where the annular convex portion 12a of the outer peripheral intermediate forming roll 12 is engaged with the outer peripheral intermediate forming roll 12 and the inner peripheral intermediate forming roll 22, the forming of the initial molded body 2 is advanced. Plastic deformation occurs in places where the contact pressure is high, such as a contact portion between 12a and the initial annular concave portion 2a and a contact portion between the tapered forming surface 22a and the inner peripheral portion of the initial formed body 2,
The molded ring body is guided to a state where the cross-sectional shape in the axial direction is curved.

If the forming step is performed in a state where the annular convex portion 12a is engaged with the initial annular concave portion 2a, the movement of the initial molded body 2 in the axial direction is prevented, so that the inner peripheral portion is formed on the tapered molding surface 22a. Even in the case where a tapered surface is formed by contact, the occurrence of displacement is suppressed, and material distribution in the axial direction is performed smoothly and uniformly.

Since a gap is formed between the outer peripheral intermediate forming roll 12 and the inner peripheral intermediate forming roll 22 even during the formation of the ring body in the middle-stage forming step, the annular convex portion 1 is formed.
2a, the initial annular recess 2a is gradually enlarged.
In the case of the middle annular concave portion 3a shown in (1), the metal material is distributed in the axial direction by radial compression.

In the middle-stage forming step, the outer peripheral portion of the ring body is formed by the middle annular recess 3a by the annular projection 12a.
Are formed, and the outer peripheral forming portion 12c and the edge forming portion 12d form the thick-walled formation changing portions 3b and 3c which are portions where the shape changes drastically. The inner peripheral portion of the ring body is formed into a tapered surface 3d by the tapered forming surface 22a. Therefore, as the forming proceeds, the metal material moves from the inner circumference to the outer circumference and from the center to the axial end.

In the middle-stage forming step, at the outer peripheral portion of the ring body, the annular convex portion 1 of the outer peripheral intermediate forming roll 12 is formed.
2a is compression-molded in a state where it is engaged with the initial annular concave portion 2a, and compression molding by the outer peripheral molded portion 12b is added as the molding proceeds, thereby expanding and deepening the initial annular concave portion 2a in the axial direction. The effect of distributing the material by equal amounts to both sides of the initial annular concave portion 2a occurs.

In the inner peripheral portion of the ring body, the tapered forming surface 22a of the inner peripheral intermediate forming roll 22 forms
When the tapered surface 3d is provided on the inner peripheral portion of the initial molded body 2, the inner peripheral portion of the initial molded body 2 is supported by the tapered molding surface 22a, and the degree of shape change in the inner peripheral portion is suppressed. Fig. 2 shows a tendency that the material distribution in the outer peripheral portion becomes relatively large.

[Final molding step] In the final molding step, FIG.
As shown in (1), molding is performed in a state where the intermediate molded body (ring body) 3 obtained in the middle-stage molding step is fed between the outer peripheral finish forming roll 13 and the inner peripheral finish forming roll 23. For example, the intermediate formed body 3 shown in FIG. 4 is obtained by repeating the rolling of 50 to 500 times, preferably about 300 times.

The annular convex portion 13 of the outer peripheral finish forming roll 13
a into the middle annular concave portion 3 a of the intermediate molded body 3, and the tapered forming surface 23 of the inner peripheral finish forming roll 23.
When the forming step is performed in a state where the a and the tapered surfaces 3d of the intermediate molded body 3 are engaged with each other, the axial movement of the intermediate molded body 3 is suppressed, and the subsequent molding accuracy is improved.

The forming of the inner peripheral portion of the ring body in the final forming step is performed by the forming rolls 22 and 23 shown in FIGS.
Since the tapered forming surfaces 22a and 23a have the same shape, the shape change of the inner peripheral portion is suppressed, and the outer peripheral portion is mainly formed.

The annular convex portion 13 of the outer peripheral finish forming roll 13
a, forming a final annular concave portion 4a in a state in which the middle annular concave portion 3a of the intermediate molded body 3 is further expanded in the axial direction, and a shape changing portion 4c in a state of protruding outward in a radial direction by the outer peripheral molded portion 13c. Thin-walled shape changing portion 4 located outside
d is formed.

The molding limit in the final molding step is shown in FIG.
As shown in FIG. 5, the process is continued until the desired shape and the desired size are obtained. However, as shown in FIG. 5, the gap G is left between the two forming rolls 13 and 23 in the radial direction. The amount of plastic deformation caused by the compression of the material is released in the axial direction, and consideration is given to smooth material distribution.

It is effective to measure the dimensions (particularly the inner diameter) of each part of the ring body during the final molding step and stop the molding when the dimensions approach the desired dimensions. In detail, the dimensions of the respective parts are set such that the inner diameter of the final compact 4 is slightly smaller, the outer diameter is slightly larger, and the axial dimension is slightly larger in consideration of the cutting allowance in the next machining finishing step. One is managed so that it becomes an approximate size.

In the examples shown in FIGS. 3 to 5, the inner peripheral portion of the ring body is hardly newly formed during the final forming step, so that the shape change portions 4b and 4 are formed by radial compression.
transfer of the metal material to form c and the final annular recess 4
Forming for smoothing the material transfer in the axial direction by reducing the thickness of the portion "a" to the vicinity of the required dimension is smoothly performed.

[Machine Finishing Step] As shown by the solid line and the broken line in FIG. 6, the final molded body 4 has a surplus portion removed by machining such as cutting and polishing. The final molded body 4 is molded by a series of molding steps up to the shape shown by the solid line in FIG. 6, but leaves a surplus portion (cutting allowance) represented by the difference between the solid line and the broken line in FIG. Therefore, X-
The completed ring body 5 can be obtained by machining with the Y-line separated into two ring bodies, or by cutting or polishing the excess portion by machining to separate the two ring bodies.

The surplus portion, which is the limit for forming the completed ring body 5, is set so as to reduce the machining allowance by machining. However, in order to improve machining accuracy and production efficiency, for example, 30 to 60%, Desirably, it is set to about 40%.

Then, through a series of forming steps and machining finishing steps shown in FIGS. 1 to 6, two metal rings 5 of the same shape are separated from the original one metal ring-shaped material 1.
In the case of manufacturing, it is necessary to form the initial annular concave portion 2a at an accurate position in the center in the axial direction in the initial forming step, which affects the material distribution thereafter, and causes excess material during machining. Determine the amount.

[Second Embodiment] FIG. 7 shows the steps of a second embodiment in which a metal ring body having a shape change portion on the outer periphery is manufactured using two pairs of forming rolls.

In this manufacturing process, the forming is advanced as shown in (a) to (g). The outer forming rough forming roll 11 and the inner forming rough forming roll 2 shown in (c) are used.
The finish forming roll 13 for the outer periphery and the finish forming roll 23 for the inner periphery shown in (f) are used, and the part corresponding to the intermediate forming roll is also used by the finish forming roll 13.23.

In the step of forming a ring body shown in (a) to (g), a gap is left in a pair of forming rolls so as to allow the ring body to expand in the axial direction during forming. This is performed according to the examples shown in FIGS.

As shown in FIG. 7 (g), the final molded body 4 has a thick-walled shape changing portion 4b near the center, and a large elongation is given to the axial end. The thin shape change portion 4c is formed.

[Other Embodiments] In the present invention, the following embodiments can be adopted. A tapered surface with a reduced diameter at the axial end is formed on the inner peripheral surface of the ring body. Forming a cylindrical inner peripheral surface on a ring body. In the above item, a shape changing portion is formed on an outer peripheral surface at an arbitrary position such as an axial end portion or a central portion. The shape change portion is a thick portion or a portion where the shape change is severe, and the number thereof is arbitrary.

[0044]

According to the method for manufacturing a metal ring having a shape change portion on the outer periphery according to the first aspect, the following effects can be obtained. (1) The ring body is fed between the outer peripheral forming roll and the inner peripheral forming roll, and is rolled with a gap between the axial ends of the two forming rolls, so that a shaft generated by radial compression. The transfer of the metal material in the direction can be made smooth, and the forming accuracy of the shape change portion can be improved. (2) By forming the initial annular concave portion on the outer peripheral surface of the metal ring-shaped material, the metal material can be distributed in a desired amount on both sides in the axial direction, and the subsequent molding can be performed smoothly. (3) As described above, the number of forming rolls can be reduced, and the labor and manufacturing cost during manufacturing can be significantly reduced. (4) The ring body after the forming process is finished by machining
Insufficient precision when forming by rolling
Manufacturing a ring with high accuracy.
Can be. (5) Combine rolling and machining
And complement each other's weaknesses and take advantage of their strengths
The desired ring body in a shorter time compared to the prior art example
Can be manufactured. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 2, the limit of forming by the forming roll is controlled by one of the inner diameter and the outer diameter and the axial dimension, and one of the dimensions is within the control range. It is possible to prevent the occurrence of defective products due to the deviation from the range, and to improve the workability thereafter. Claim 3
According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the above, the following effects can be obtained. (1) By giving a shape change portion to the outer periphery while suppressing the change in the shape of the inner periphery, the transition of the metal material caused by compression during molding is concentrated on the outer periphery, and the molding of the outer periphery is smooth. Can be performed. (2) By reducing the change in the shape of the inner peripheral portion during molding, it is possible to easily grasp the progress of molding. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the fourth aspect , by dividing the final molded body into two, two ring bodies can be easily obtained, and manufacturing efficiency can be improved. And so on. Claim
According to the method for manufacturing a metal ring body having a shape changing portion on the outer periphery according to the fifth aspect , the following effects are obtained. (1) By forming the initial annular concave portion at the central portion in the axial direction, it is possible to prevent the occurrence of axial displacement of the ring body without being affected by the shape of the inner peripheral portion. (2) The distribution of the metal material in the axial direction after the initial annular concave portion is formed can be equally divided. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 6 , the following effects can be obtained. (1) Since the metal ring body is symmetrical in the axial direction, two ring bodies having the same shape or a ring body symmetrical in the axial direction can be obtained by a single molding step. (2) The distribution of the metal material from the central annular recess toward both ends in the axial direction is made uniform, so that the shape change portion can be formed smoothly. According to the method of manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 7 , by forming the initial annular concave portion in a state where the axial movement of the metal ring-shaped material is restrained, it is possible to achieve a desired axial direction. In this position, the initial annular concave portion is accurately formed, and the subsequent molding process can be performed with high accuracy based on the initial annular concave portion. Claim
According to the method for manufacturing a metal ring body having a shape changing portion on the outer periphery according to No. 8 , the following effects can be obtained. (1) By engaging the tip of the outer peripheral forming roll with the initial annular concave portion, the dimensional accuracy of the initial annular concave portion can be transferred to the subsequent forming process while preventing occurrence of axial displacement of the initial molded body. , High-precision molding can be performed. (2) By preventing the occurrence of axial displacement in the outer peripheral portion, the workability of forming the outer peripheral portion can be enhanced, and the arbitrary shape can be imparted. According to the method of manufacturing a metal ring having a shape changing portion on the outer periphery according to the ninth aspect , the following effects can be obtained. (1) When the inner peripheral portion is formed while the axial movement of the inner peripheral portion of the ring body is free, the transition of the metal material caused by radial compression is smoothly performed in the vicinity of the inner peripheral surface. In addition, the formability of the outer peripheral portion can be improved. (2) As described above, the formability of the ring body having a large change in the shape in the axial direction can be improved. According to the method of manufacturing a metal ring having a shape change portion on the outer periphery according to claim 10 , the outer peripheral portion is restrained in the axial direction of the ring by a contact point between the inner peripheral portion of the ring and the inner peripheral forming roll. The formation of the portion is performed, and there is an effect that a high-precision molding can be performed at a desired position on the outer peripheral portion. Claim 11
According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the above, the following effects can be obtained. (1) The tapered surface formed on the inner peripheral portion of the ring body is
When the diameter of the axial end portion is increased, the axial movement of the ring body is suppressed by engagement with the inner peripheral forming roll, and the forming accuracy of the outer peripheral portion can be increased. (2) By the above, the shape of the inner peripheral portion is simplified to facilitate the transfer of the metal material in the radially outward direction near the end portion,
The formability of the shape change portion on the outer peripheral portion can be improved. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 12 , the following effects can be obtained. (1) The tapered surface formed on the inner peripheral portion of the ring body is
When the diameter of the axial end portion is reduced, the axial movement of the ring body is suppressed by engagement with the inner peripheral forming roll, and the forming accuracy of the outer peripheral portion can be improved. (2) As described above, the transfer of the metal material to the radially outward direction in the vicinity of the central portion in the axial direction can be facilitated, and the formability of the shape change portion located in the vicinity of the central portion can be improved. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 13 , compression molding is performed by cold rolling, thereby suppressing transformation of a metal structure and forming a uniform metal ring. It has effects such as being able to do. According to the method for manufacturing a metal ring having a shape-change portion on the outer periphery according to claim 14 , the number of forming rolls to be used can be reduced by using the inner circumferential forming rolls after the middle-stage forming step. To play. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 15 , the following effects can be obtained. (1) The applicability to hard materials such as components for gas turbine combustors can be improved. (2) As described above, the applicable range of the manufacturing method can be expanded. According to the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 16 , even if the structure is hardened by the forming, the ring body is subjected to intermediate annealing during forming, before rolling. By returning to the structure, the hardened portion of the metal structure is eliminated, and the following effects can be obtained, such as improving the moldability. According to the method of manufacturing a metal ring body having a shape change portion on the outer periphery according to claim 17 , the metal material can be shifted to the axial end by enlarging the annular concave portion, and formability can be improved. . Claim
According to the method of manufacturing a metal ring body having a shape change portion on the outer periphery according to 18 , since the metal material moves to both sides when the annular shape recess is formed, the formation of the shape change portion near the position where the annular shape recess is formed Performance can be improved. Claim 1
According to the method of manufacturing a metal ring having a shape change portion on the outer periphery according to No. 9 , by controlling the forming limit of the ring by detecting the diameter dimension, the occurrence of a surplus portion is suppressed, and This has the effect of improving the workability of removing excess portions in the process.

[Brief description of the drawings]

FIG. 1 is a front sectional view in which a part of a metal ring-shaped material applied to a first embodiment of a method of manufacturing a metal ring body having a shape change portion on an outer periphery according to the present invention is omitted.

FIG. 2 is a front cross-sectional view, partially omitted, showing an implementation state of an initial forming step in the first embodiment of the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the present invention.

FIG. 3 is a front sectional view, partially omitted, showing the state of execution of a middle-stage forming step in the first embodiment of the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the present invention.

FIG. 4 is a front sectional view, partially omitted, showing the state of execution of a final molding step in the first embodiment of the method for manufacturing a metal ring body having a shape change portion on the outer periphery according to the present invention.

FIG. 5 is a front sectional view, partially omitted, showing a final molded body after the step of FIG. 4;

6 is a front cross-sectional view of the final molded body and the completed ring body after the process of FIG. 5, with some parts omitted.

FIG. 7 is a front cross-sectional view of a second embodiment of a method of manufacturing a metal ring body having a shape change portion on an outer periphery according to the present invention, in which a part of the process status is omitted, showing a state of implementation of each step;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal ring-shaped material (ring body) 2 Initial molded body (ring body) 2a Initial annular recessed part 3 Intermediate molded body (ring body) 3a Middle annular recessed part 3b / 3c shape change part 3d Tapered surface 4 Final molded body ( Ring body) 4a Final annular concave portion 4b, 4c Shape change portion 4d Tapered surface 5 Finished ring body 11 Outer rough forming roll (outer circumferential forming roll) 11a Annular convex portion 11b Forming cavity 11c Tapered surface 12 Outer circumferential intermediate forming roll (outer circumference) Forming roll) 12a Annular convex portion 12b Forming cavity 12c Outer peripheral forming portion 12d Edge forming portion 13 Finish forming roll for outer periphery (peripheral forming roll) 13a Annular convex portion 13b Forming cavity 13c Outer forming portion 13d Edge forming portion 21 For inner periphery Rough forming roll (inner circumference forming roll) 21a Support groove 22 Inner circumference intermediate forming roll (inner circumference forming roll) 22a Tapered forming surface 23 Finish forming roll for inner circumference (inner forming roll) 23a Tapered forming surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-216229 (JP, A) JP-A-51-62177 (JP, A) JP-A-62-97735 (JP, A) JP-A-63-1987 72442 (JP, A) JP-A-2-34201 (JP, A) JP-A-62-227540 (JP, A) JP-A-53-18462 (JP, A) JP-B-58-31256 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B21H 1/06

Claims (19)

(57) [Claims] 1. A metal ring-shaped material having an inner diameter smaller than a desired dimension and an axial cross-sectional area larger than a desired cross-sectional area is fed between an outer forming roll and an inner forming roll, and axial ends of both forming rolls are formed. A method of manufacturing a metal ring body having a shape change portion on the outer periphery by rolling the ring body with a gap between the parts , wherein the bottom has a flat support groove.
Between the inner and outer forming rolls
Feeding the ring-shaped raw material, forming an initial annular concave portion with a partially reduced radial thickness on the outer peripheral surface of the metal ring-shaped material, applying compressive force in both radial directions to the initial annular concave portion There rows molded to the outer diameter and axial dimension smaller inner diameter than the desired shape is increased by increasing the axial dimension, after the molding process of the ring body, Tokoro by machining
A method of manufacturing a metal ring having a shape-change portion on an outer periphery, characterized by adding a step of finishing to a desired shape . 2. The method according to claim 1, wherein the forming is performed until one of the inner diameter, the outer diameter, and the axial dimension is close to a desired dimension. 3. A shape changing portion is provided on an outer peripheral portion while suppressing occurrence of a shape change on an inner peripheral portion.
3. The method for producing a metal ring having a shape-change portion on the outer periphery according to 1 or 2 . 4. A after the forming step of the ring body, the shape changing portion to the outer periphery of any one of claims 1 to 3, the step of dividing the ring body in the middle of the axial direction, characterized in that it is added Manufacturing method of metal ring body having. 5. The initial annular recess are provided methods for producing the metal ring member on the outer periphery of any one of claims 1 to 4 having a shape changing unit which is characterized by being formed in a central portion in the axial direction. 6. A metal ring body formed by a forming step is symmetrical in an axial direction.
The method for producing a metal ring having a shape-change portion on the outer periphery according to any one of claims 1 to 5 . In a state where 7. detained axial movement of the metal ring-shaped material, the shape changing portion to the outer periphery of any one of claims 1 to 6, characterized in that to form the initial annular recess Manufacturing method of metal ring body having. 8. The ring according to claim 1, wherein the annular convex portion of the outer peripheral forming roll is engaged with the initial annular concave portion of the ring body to suppress the axial deviation of the ring body . one
A method for producing a metal ring body having a shape-changing portion on the outer periphery according to the above item . 9. The medium-term molding process after, while the free axial movement of the inner peripheral side of the ring member, one of the claims 1 to 10, characterized by performing molding of the inner peripheral surface one
A method for producing a metal ring body having a shape-changing portion on the outer periphery according to the above item . 10. The inner peripheral surface is formed while the axial movement of the ring body is restrained by a contact point between the inner peripheral surface of the ring body and the inner peripheral forming roll.
The method for producing a metal ring having a shape-change portion on the outer periphery according to any one of claims 1 to 9 . 11. A tapered surface having a large diameter at an axial end portion is formed on an inner peripheral surface .
The method for producing a metal ring having a shape-changed portion on the outer periphery according to any one of claims 10 to 10 . 12. A tapered surface having a reduced diameter at an end in the axial direction is formed on an inner peripheral surface .
12. The method for manufacturing a metal ring body having a shape change portion on an outer periphery according to any one of items 11 to 11 . 13. The method for producing a metal ring body having a shape changing portion to the outer periphery of any one of claims 1 to 12, the compression molding is characterized in that is made by cold rolling. 14. The method of claim inner peripheral forming roll in metaphase forming process after it, characterized in that it is combined 1-13 Noi
The method for manufacturing a metal ring body having a shape change portion on an outer periphery according to any one of the preceding claims. 15. The metal ring body is a hard material such as a component for a combustor of a gas turbine .
15. The method for producing a metal ring body having a shape-change portion on the outer periphery according to any one of items 14 to 14 . 16. A method of manufacturing a metal ring body having a shape changing portion to the outer periphery of any one of claims 1 to 15, characterized in that the addition of intermediate annealing step during molding. 17. A shape changing portion, the axially opposite end portions the metal ring body having a shape changing portion to the outer periphery of any one <br/> of claims 1 to 16, characterized in that formed in the vicinity Production method. The 18. The shape changing part, according to claim 1 to 17, characterized in that formed in the vicinity formation position of the initial annular recess Neu
The method for manufacturing a metal ring body having a shape change portion on an outer periphery according to any one of the preceding claims. 19. Metal ring having a shape changing portion to the outer periphery of any one of claims 1 to 18, characterized in that the step of detecting the diameter of the ring body at the end of the molding step is added How to make the body.