WO1999047291A1 - Method of manufacturing sheet metal product having groove in inner circumferential end surface thereof - Google Patents

Abstract

A method of manufacturing a sheet metal product having a groove in an inner circumferential end surface thereof, capable of forming a groove in an inner circumferential end surface of a sheet metal work without using a cutting process; rendering it unnecessary to remove chips filled in such a groove; eliminating the possibility that the chips deteriorate the working environment; and improving the smoothness of a bottom and side surfaces of such a groove. The gist of this method resides in that a groove is formed in an inner circumferential end surface of an opening-carrying sheet metal product by moving an inner grooving mold, which is provided in the opening, in the diametrically outward direction of the work and thereby pressing a groove molding surface of the inner mold against the inner circumferential end surface, i.e. the circumferential surface of the opening as the work is turned in a predetermined position around the axis of the opening. According to this method, a groove can be provided in an inner circumferential end surface of a sheet metal product without using a cutting process.

Description

 Description Method of manufacturing sheet metal products with grooves on the inner peripheral end face

 The present invention relates to a method for manufacturing a sheet metal product having a groove on an inner peripheral end face. Specific examples of the sheet metal product manufactured by the present invention include a disk-shaped part for forming a fluid chamber filled with a fluid used in a transmission of an automobile. .

Background art

 Conventionally, when manufacturing a sheet metal product with a groove on the inner peripheral end surface by forming a groove extending in the circumferential direction on the inner peripheral end surface of a sheet metal work having an opening, cutting processing was often used. . However, when cutting is performed, not only does the work of removing the cutting powder clogging the grooves during and after cutting become troublesome, but also the working environment is deteriorated by the cutting powder and the like. However, there is a problem that it is difficult to improve the surface smoothness of the groove bottom surface and the groove wall surfaces on both sides of the groove bottom surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to form a groove on the inner peripheral end surface of a sheet metal work without cutting. It is not necessary to perform work to remove the cutting powder clogged in the work, and the working environment is deteriorated due to the cutting powder. An object of the present invention is to provide a method of manufacturing a sheet metal product having a groove on an inner peripheral end surface capable of improving the surface smoothness of a groove bottom surface and a groove wall surface without leaving room for fogging. Disclosure of the invention

 In order to achieve the above object, a method for manufacturing a sheet metal product having a groove on an inner peripheral end face according to the present invention includes the steps of: rotating a sheet metal work having an opening at a fixed position around the axis of the opening; By moving the grooving inner die provided in the opening radially outward of the work, the grooving molding surface of the grooving inner die is moved to the inner peripheral surface of the opening. It presses against the end surface to form a groove on the inner peripheral end surface.

 According to this method, a groove can be provided on the inner peripheral end face of the sheet metal product without cutting.

 At this time, the outer die for grooving is moved radially inward on the outer peripheral end face while rotating the circular sheet metal work, so that the outer die for grooving is grooved. A method in which a molding surface is pressed against the outer peripheral end surface to form a groove therein is disclosed, for example, in Japanese Patent Publication No. 5-81339.

However, as a method of forming a groove in the inner peripheral end surface of the sheet metal work, the above-described method of cutting has been conventionally performed. As in the present invention, the sheet metal work is not used. While rotating, insert the inner grooved die set in the opening of the According to the present invention, a method of forming a groove by pressing the groove forming surface of the inner groove forming die against the inner peripheral end surface, which is the peripheral surface of the opening, by moving the groove toward the inner side. It was originally proposed. In addition, in the case where some processing is performed on a sheet metal work using a mold, at present, means for moving the outer mold arranged outside the work with respect to the workpiece is a common means. There. Therefore, as in the present invention, the groove is formed on the inner peripheral end face by adopting a method of moving the inner groove forming die radially outward in the opening of the rotating sheet metal work. The method of manufacturing a sheet metal product having the above does not coincide with the method of forming grooves on the outer peripheral end surface disclosed in the above-mentioned Japanese Patent Publication No. 5-813339.

 The manufacturing method according to the present invention can be carried out regardless of the thickness of the work made of sheet metal. That is, when the work is thick enough to form a groove as it is, a groove can be formed directly on the inner peripheral end face. On the other hand, when the work is too thin to form a groove until then, a thickening step for thickening the peripheral portion of the opening of the work is performed. Thus, the production method of the present invention can be performed. The thickening step in this case may be performed prior to the above-described groove forming step (grooving step), or the thickening step may be performed simultaneously with the groove forming step.

Have a groove on the inner peripheral end face by performing the thickening process and the grooving process When manufacturing sheet metal products, in both the thickening process and the grooving process, it is necessary to adopt a method of moving the inner mold placed in the opening of the work outward in the radial direction of the work. Desirable. In this case, the inner mold used in the thickening step is an inner mold for thickening having a molding surface for thickening, and the inner mold used in the grooving step is provided with the molding surface for grooving described above. It is an inner mold for grooving. The thickening process and the grooving process performed by moving the inner die to the outside of the work in the radial direction of the work are performed for the same reasons as described above, and the above-mentioned Tokuho 5 — 8 1 3 3 9 It is not intended to be in line with the method of grooving the outer peripheral end surface disclosed in the gazette.

 In the manufacturing method according to the present invention, it is preferable that the inner groove forming die is rotationally driven in synchronization with the work.

 This method improves the surface smoothness of the inner surface of the groove formed by the grooved molding surface (for example, the groove bottom surface and the groove wall surfaces on both sides thereof). In particular, when the grooving inner die is rotated in synchronization with the above-mentioned work so that the grooving molding surface of the grooving inner die does not slip on the inner peripheral end surface of the work, the work is increased. The inner surface of the groove formed by the groove forming surface is roughened by friction with the groove forming surface because the groove forming surface of the groove inner mold does not rub against the inner peripheral end surface of the groove. It is unlikely that the surface smoothness will be reduced.

The shape of the groove provided on the inner peripheral end face of the sheet metal product manufactured according to the present invention may be V-shaped, U-shaped, or square. Or an arc shape. Like these rectangular grooves, grooves having a groove bottom concentric with the axis of the work opening and groove walls on both sides of the groove bottom are formed in the opening of the obtained sheet metal product. It can be suitably used to hold a seal ring for liquid-tightly sealing a gap between the inserted shaft and the sheet metal product externally fitted to the shaft. Further, the arc-shaped groove holds a large number of balls that slidably connect the inner member provided at the opening and the outer member formed by the sheet metal product. When such a configuration is adopted, the inner member and the outer member are slidably connected without using a separate ball bearing. You. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a partially cutaway front view showing a preparation stage for an embodiment of the manufacturing method according to the present invention.

 FIG. 2 is a partially broken front view showing a groove forming step in the embodiment of the manufacturing method according to the present invention.

 FIG. 3 is a partial cross-sectional view showing a preliminary thickening step in the embodiment of the manufacturing method according to the present invention.

 FIG. 4 is a partial cross-sectional view showing the thickening step in the embodiment of the manufacturing method according to the present invention.

FIG. 5 shows a preliminary groove for an embodiment of the manufacturing method according to the present invention. It is a fragmentary sectional view showing an attaching process.

 FIG. 6 is a partial cross-sectional view showing the groove forming step in the embodiment of the manufacturing method according to the present invention.

 FIG. 7 is an explanatory view showing the shape of the periphery of the opening in each step of the sheet metal work that has undergone the thickening step and the grooving step.

 FIG. 8 is a partial cross-sectional view illustrating the shape of the groove.

 FIG. 9 is a partial cross-sectional view illustrating a sheet metal product obtained by the manufacturing method of the present invention.

FIG. 10 is a partial cross-sectional view illustrating another sheet metal product obtained by the manufacturing method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION An embodiment will be described with reference to FIG. 1 and FIG. In the figure, a work holding member 1 is composed of a rotary mounting table 12 around which a drive belt 11 is wound and a presser table 13 disposed opposite to the rotary mounting table 12. The work W made of sheet metal is held between the rotary mounting table 12 and the presser table 13 and held at a fixed position. The work W as a starting material is circular, has a circular opening 81 in the center thereof, and the inner peripheral end surface 82 is formed by the peripheral surface of the opening 81. The inner peripheral end surface 82 is a target portion for grooving. Then, when the rotary mounting table 1 2 of the work holding member 1 is driven to rotate, the work W is pressed against the rotary mounting table 1 2 by the presser table 1 3, and Rotate at a fixed position around the axis of the opening 81.

 The grooved inner die 2 is a ring-shaped grooved surface 2

1 and is located in the opening 81 of Work W. The inner mold 2 for grooving is a slide drive mechanism including a cam plate 31 and a movable base 32 that is slid horizontally by the rotation of the cam plate 31. 3 and is connected to the rotary drive shaft 33 as well as being mounted on the movable table 32. The rotary drive shaft 33 has a fixed position with respect to the movable table 32 of the slide mechanism 3, and the rotation axis R of the slide drive shaft 33 corresponds to the grooved molding surface 2 of the grooved inner die 2.

Coincides with the 1 axis. Therefore, when a rotational force is transmitted to the rotary drive shaft 33, the groove forming inner die 2 rotates together with the rotary drive shaft 33, and when the cam plate 31 rotates, the movable base 32 is moved together with the movable base 32. Grooving inner die 2 slides in the horizontal direction and moves. In addition, it is possible to simultaneously rotate and move the inner groove forming die 2 in the lateral direction.

 Rotating the rotation drive shaft 33 while rotating the work W held by the work holding member 1 in the preparation stage of FIG. 1 together with the work holding member 1 around the axis of the opening 81 at a fixed position, Cam plate at the same time

3 When the 1 is rotated, the grooved inner die 2 arranged in the opening 8 1 of the work W is slid horizontally as indicated by the arrow M in Fig. 2 while rotating. Move radially outward of W. Due to such movement of the inner mold 2 for grooving, the molding surface 2 for grooving is formed.

1 is the inner peripheral end face 8 2 which is the peripheral face of the opening 8 1 as shown in FIG. When pressed, the groove forming surface 21 bites into the inner peripheral end surface 82 corresponding to the pressing force at that time, and a groove is formed in the inner peripheral end surface 82.

 The process described above is a grooving process, and FIG. 9 shows an example of a sheet metal product obtained through the grooving process. In the sheet metal product S1 in the same figure, a portion indicated by reference numeral 83 is a groove formed by passing through the above-mentioned groove forming step. The groove 83 has a ring shape extending in the circumferential direction of the inner peripheral end face 82 of the opening 81.

 When performing the above-mentioned grooving process, when the grooving molding surface 21 of the grooving inner die 2 is pressed against the inner peripheral end surface 82 of the work W, the two are rotated without slipping. It is desirable to have. For this purpose, the groove forming inner mold 2 may be rotated and driven in synchronization with the work W. Preferably, the peripheral speed of the groove forming surface 21 and the inner circumferential end face 8 2 of the work W are preferably set. It is preferable that the inner groove forming die 2 is rotated in synchronization with the work W so that the peripheral speed of the groove 2 becomes the same. As described above, when the groove 83 is formed so that the groove forming surface 21 and the inner peripheral end surface 82 of the work W do not slip, the inner surface (surface) of the groove 83 is formed. The smoothness is improved. Therefore, when the seal ring is held in the groove 83, high adhesion is secured between the seal ring and the inner surface of the groove 83.

Another embodiment will be described with reference to FIGS. 3 to 6 and FIG. In this embodiment, FIG. 3 is a two-dot chain line, and FIG. 7 is a one-dot chain line. The thickening process for increasing the thickness of the periphery of the opening 81 of the sheet metal work W as the starting material shown, and the grooving process according to the above are performed in this order. . The thickening step is performed, for example, when the work W as a starting material is thin and it is difficult to form the groove 83 of the inner peripheral end face 82 until then. Therefore, by performing such a thickening process, it is possible to manufacture a sheet metal product having the groove 83 on the inner peripheral end face 82 even if the thin work W is used as a starting material. The benefits of being able to

 The thickening process in the figure is divided into the preliminary thickening process shown in Fig. 3 and the actual thickening process shown in Fig. 4.

 In the preparation stage of the preliminary thickening process in FIG. 3, a circular work W indicated by a virtual line is clamped by the work clamping member 1A. The work holding member 1A has a rotary mounting table 12A that is driven to rotate, and a presser table 13A that is provided to face the rotary mounting table 12A. Is held between the rotary mounting table 12 A and the presser table 13 A and held at a fixed position. Then, when the rotary mounting table 12 A is driven to rotate, the work W is pressed against the rotary mounting table 12 A by the presser table 13 A, and the circumference of the axial line of the opening 81 is maintained. In addition, it rotates in a fixed position. The rotating mounting table 12A and the presser table 13A are provided with tapered surfaces 14 and 15 that extend inward.

4A is an inner mold for preliminary thickening. This inner mold for preliminary thickening 4 A has a ring-shaped recessed pre-thickened molding surface 41 A, and is arranged in the opening 81 of the work W at the preparation stage. The inner mold 4A for thickening the pre-thickness can be slid and moved in the lateral direction by the action of the slide drive mechanism 3 similar to that described with reference to FIGS. 1 and 2. In addition to this, it is possible to rotate around the axis of the pre-thickened molding surface 41A. In addition, it is possible to simultaneously rotate and move the inner mold 4A for preliminary thickening in the lateral direction.

 As shown in Fig. 3, the work W held by the work holding member 1A and the work holding member 1 are rotated at a fixed position around the axis of the opening 81 along with the work holding member 1, and the pre-thickening inner die 4 is rotated. When A is laterally slid as indicated by an arrow M1 and moved outward in the radial direction of the work W, the pre-thickened molding surface 41A is formed in the opening 81 of the work W. Press the periphery. As a result, the peripheral portion of the opening 81 of the work W is pushed radially outward as shown in the figure, and accordingly, the peripheral portion of the opening 81 is formed into a pre-thickened molding surface. The bulge bulges into a shape that fills the space between 41 A and the taper surfaces 14 and 15 described above, and the peripheral edge of the opening 81 is preliminarily thickened. In the pre-thickening process shown in the figure, the inner peripheral end of the pre-thickened portion (pre-thick portion) 84 has a relatively long shape and protrudes inward.

Work W that has passed through the pre-thickening process is thickened in the thickening process shown in Fig. 4. In the preparation stage of this thickening process, The work W that has passed through the process is clamped by the work clamping member 1B. The work holding member 1B has the same structure as the work holding member 1A described in FIG. The slope of the taper surfaces 16 and 17 is greater than the slope of the taper surfaces 14 and 15 described in Fig. 3. The thickened inner mold 4B has the same structure as the preliminary thickened inner mold 4A described with reference to FIG. 3, but has a recessed actual thickness formed in a ring shape. The concave depth of the thickening molding surface 41B is smaller than that of the preliminary thickening molding surface 41A described in FIG.

 In the preparation stage of the inner mold 4B for thickening, the work W is arranged in the opening. This inner mold 4B for thickening can be slid and moved in the lateral direction by the action of the slide drive mechanism 3 similar to that described in FIGS. 1 and 2. As well as being able to rotate around the axis of the thickened molding surface 41B. In addition, it is possible to rotate the inner mold 4B for thickening and to move the inner mold 4B in the lateral direction at the same time.

As shown in Fig. 4, the work W held by the work holding member 1B and the work holding member 1 are rotated at a fixed position around the opening axis while the work holding member 1 is rotated. As shown by arrow M2, when the workpiece is slid in the lateral direction and moved outward in the radial direction of the work W, the thickened molding surface 41B is the extra thick wall which is the periphery of the opening. Department 8 4 (see FIG. 3), so that the preliminary thickened portion 84 forms a space between the thickened molding surface 41 B and the taper surfaces 16 and 17 described above. It swells to fill the shape and the thickness is increased. In the illustrated thickening process, the cross-sectional shape of the thickened portion (the thickened portion) 85 is close to a regular polygon.

 If the thickening step is divided into the preliminary thickening step and the main thickening step as described above, there is an advantage that buckling at the peripheral portion of the opening 81 is less likely to occur.

 Although the grooving process is divided into the preliminary grooving process shown in Fig. 5 and the main grooving process shown in Fig. 6, each grooving process is basically the same as that described in Figs. 1 and 2. It is performed through the same procedure as the attaching process.

In the preparation stage of the preliminary grooving process shown in FIG. 5, the work W having undergone the thickening process described with reference to FIG. 4 is clamped by the work clamping member 1C. The work holding member 1C has a rotary mounting table 12C that is driven to rotate, and a presser table 13C that is provided to face the rotary mounting table 12C. The rotary mounting table 12 C and the presser table 13 C are sandwiched and held at a fixed position. Then, when the rotary mounting table 12C is driven to rotate, the work W is pressed against the rotary mounting table 12C by the presser table 13C, and its opening (the thick wall as described in FIG. 4). (The opening surrounded by the part 85) rotates in a fixed position around the axis. In addition, the rotating mounting table 12 C and the presser table 13 C have inwardly extending taper surfaces 18, 1 9 Is provided.

 4 C is an inner mold for preliminary grooving. The pre-grooving inner mold 4 C has a pre-grooving molding surface 41 C having a ring shape and a substantially semicircular cross section, and is provided in the opening of the work W in the preparation stage. Have been. The inner groove 4C for preliminary grooving can be moved by sliding in the lateral direction by the action of the slide drive mechanism 3 similar to that described with reference to FIGS. 1 and 2. As a result, the pre-grooving molding surface 41 C can be rotated around the axis. It is also possible to rotate the inner groove 4C for preliminary grooving and to move it in the lateral direction at the same time.

 The work W held by the work holding member 1C as shown in FIG. 5 is opened together with the work holding member 1 (the opening surrounded by the thick portion 85 described in FIG. 4). ), While rotating it at a fixed position around the axis of 予 備, slide the inner groove 4C for pre-grooving in the lateral direction as indicated by the arrow M3 so that it moves radially outward of the work W. When it is moved, the preformed groove forming surface 41C pushes the thick wall portion 85 (see Fig. 4), which is the inner peripheral end surface of the work W, radially outward. As a result, the pre-grooving molding surface 41 C of the work W bites into the main thick portion 85, and the pre-groove 86 is formed in the main thick portion 85.

Work W that has undergone the preliminary grooving process is fully grooved in the grooving process shown in Fig. 6. In the preparation stage of the grooving process, the work W having undergone the preliminary grooving process is held by the work holding member 1D. . The work holding member 1D has the same structure as the work holding member 1C described in FIG. 5, but the rotary mounting table 12D and the presser base 13D have the same structure as that of FIG. Instead of the taper surfaces 18 and 19 described, groove forming surfaces 18D and 19D are provided. These groove forming surfaces 18D and 19D are useful for finishing the shape of the groove outer surface with high accuracy. The inner groove forming die 4D has the same structure as the pre-thickened inner die 4A described in FIG. 5, but has a ring-shaped forming surface 4 1. It differs from that of Fig. 5 in that the shape of D is almost square. In the preparation stage of the inner grooved die 4D, the work W is provided in the opening (the opening surrounded by the spare groove 86 described in FIG. 5). This inner groove forming die 4D can be slid and moved in the lateral direction by the action of the slide drive mechanism 3 similar to that described with reference to FIGS. 1 and 2. In addition, it is possible to rotate around the axis of the groove forming surface 41D. In addition, it is possible to simultaneously rotate and move the inner groove forming die 4B in the lateral direction.

As shown in FIG. 6, the work W held by the work holding member 1D as shown in FIG. 6 and the work holding member 1 are fixed around the axis of the opening (the opening surrounded by the spare groove 86 described in FIG. 5). While rotating the inner groove 4D, slide it in the horizontal direction as indicated by arrow M4 and move it outward in the radial direction of the work W. Forming surface 4 ID presses the pre-grooved inner peripheral end face of work W, and thereby the actual groove is formed on the inner peripheral end face.o

 As shown in FIG. 7, the groove 83 formed on the inner peripheral end surface of the sheet metal product S 2 manufactured through the above-described thickening step and groove forming step is concentric with the axis of the opening 81. And a groove bottom surface 8 3a on both sides of the groove bottom surface 8 3a. With this shape of the groove, the gap between the shaft (not shown) passed through the opening of the sheet metal product S2 and the sheet metal product S2 fitted to the shaft is liquid-tight. Thus, it is possible to suitably hold the seal ring for sealing the seal. When the groove 83 is used for such a purpose, the peripheral speed of the groove forming surface 41D and the inner circumference of the work W are required when performing the above-described groove forming step, particularly, when performing the main groove forming step. It is desirable to keep the peripheral speed of the end face the same so that they do not slip. By doing so, the smoothness of the inner surface (surface) of the groove 83 is improved, and when the seal ring is held, the gap between the seal ring and the inner surface of the groove 83 is increased. High adhesion is ensured. In FIG. 7, the work W made of sheet metal as a starting material is represented by a one-point line, the work W which has been preliminarily thickened is represented by a two-dot chain line, and the thickened work W is shown. W is represented by a dashed line, and the pre-grooved work W is represented by a three-dot chain line.

FIG. 8 shows a sheet metal product S3 in which the peripheral portion of the opening of the work is made uneven in the thickness increasing step and a groove 83 is formed therein. Ma Fig. 10 shows a sheet metal product S4 in which the peripheral portion of the opening of the work was made uneven in the thickening process to form a groove 83 and a groove 86 on the outer peripheral surface. Is shown. The groove 86 on the outer peripheral surface is not formed by the method of the present invention. Industrial applicability

 As described above, according to the method for manufacturing a sheet metal product having a groove on the inner peripheral end face according to the present invention, a sheet metal product having a groove on the inner peripheral end face can be manufactured without using cutting. It becomes. Furthermore, since the groove bottom surface and the groove wall surface have high surface smoothness, the sheet metal product manufactured according to the present invention uses the groove on the inner peripheral end surface as a holding groove for the seal ring or holds the ball. It can be used as a groove.

Claims

The scope of the claims  1. While rotating a sheet metal work having an opening in a fixed position around the axis of the opening, the inner mold for grooving provided in the opening is moved radially outward of the work. The groove is formed on the inner peripheral end surface by pressing a groove forming surface of the inner groove for forming the groove on the inner peripheral end surface which is the peripheral surface of the opening. Manufacturing method of sheet metal products.  2. The method for manufacturing a sheet metal product having a groove on an inner peripheral end face according to claim 1, wherein the inner groove forming die is rotated in synchronization with the work.  3. The groove formed on the inner peripheral end face according to claim 1, wherein the groove formed on the inner peripheral end face has a groove bottom surface concentric with the axis of the opening and groove wall surfaces on both sides of the groove bottom surface. Manufacturing method of sheet metal products o  4. The groove formed on the inner peripheral end surface according to claim 2, wherein the groove formed on the inner peripheral end surface has a groove bottom surface concentric with the axis of the opening and groove wall surfaces on both sides of the groove bottom surface. The method of manufacturing sheet metal products. 5. A thickening step of thickening the periphery of the opening of the sheet metal work having the opening, and disposing the work inside the opening while rotating the work around the axis of the opening in a fixed position. By moving the groove forming die radially outward of the work, the groove forming surface of the groove forming inner die is moved to the inner peripheral end surface which is the peripheral surface of the opening. And forming a groove on the inner peripheral end face by pressing. A method for manufacturing a sheet metal product having a groove on the inner peripheral end face.  6. In the thickening step, the inner mold for thickening, which is provided in the opening of the work, is moved outward in the radial direction of the work to increase the thickness of the inner mold. 6. The method for producing a sheet metal product having a groove on the inner peripheral end face according to claim 5, wherein the molding is performed by pressing a molding surface against a peripheral edge of the opening.  7. The method for manufacturing a sheet metal product having a groove on an inner peripheral end face thereof according to claim 5, wherein the inner groove forming die is rotated in synchronization with the work.  8. The method for manufacturing a sheet metal product having a groove on an inner peripheral end face according to claim 6, wherein the inner groove forming die is rotated in synchronization with the work.  9. The groove formed on the inner peripheral end surface according to claim 5, wherein the groove formed on the inner peripheral end surface has a groove bottom surface concentric with the axis of the opening and groove wall surfaces on both sides of the groove bottom surface. Manufacturing method for sheet metal products  10. The inner peripheral end surface according to claim 6, wherein the groove formed on the inner peripheral end surface has a groove bottom surface concentric with the axis of the opening and groove wall surfaces on both sides of the groove bottom surface. Of manufacturing a sheet metal product having a groove in its surface.