US20060144118A1 - Method for manufacturing disk member - Google Patents
Method for manufacturing disk member Download PDFInfo
- Publication number
- US20060144118A1 US20060144118A1 US10/547,154 US54715404A US2006144118A1 US 20060144118 A1 US20060144118 A1 US 20060144118A1 US 54715404 A US54715404 A US 54715404A US 2006144118 A1 US2006144118 A1 US 2006144118A1
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- United States
- Prior art keywords
- boss
- burring
- die
- disk member
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 238000004519 manufacturing process Methods 0.000 title claims description 48
- 238000000034 method Methods 0.000 title abstract description 3
- 238000003825 pressing Methods 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims description 31
- 238000005242 forging Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 239000012467 final product Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000007788 roughening Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 230000003028 elevating effect Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B27/1036—Component parts, details, e.g. sealings, lubrication
- F04B27/1054—Actuating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/32—Making machine elements wheels; discs discs, e.g. disc wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/0804—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B27/0821—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block component parts, details, e.g. valves, sealings, lubrication
- F04B27/086—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block component parts, details, e.g. valves, sealings, lubrication swash plate
Definitions
- the present invention relates to a method of manufacturing a disk member, and more particularly, to a method of manufacturing a disk member which is preferred for use as a swash plate of a swash plate compressor, for example.
- a method of manufacturing a disk member which is used for a swash plate of a swash plate compressor is known in the art (see patent literature 1, for example).
- a disk member 1 is manufactured by manufacturing steps shown in FIG. 4 . Specifically, a through-opening Wa is initially formed through the center of a plate-shaped raw material W in the form of a disk, as shown in FIG. 4 ( a ). A burring operation is then applied to the margin of the through-opening Wa to cause the margin to rise upward to its feet to shape a burring area Wb in the form of a truncated cone, as shown in FIG. 4 ( b ).
- a punch 4 is then passed through the inside of the burring area Wb, as shown in FIG. 5 , and the burring area Wb is strongly compressed from above and from below in the axial direction between an upper die 5 and a lower die 6 , thus causing a plastic deformation of the burring area around the through-opening Wa to form a boss WB having a greater wall thickness than the original wall thickness t of the plate-shaped raw material W (see FIGS. 4 ( c ) and 5 ).
- This operation also forms a body WA extending radially outward and continuing from the boss WB.
- This step is referred to as a “swaging step” in the art.
- the boss WB has a top surface WB′ which is swollen upwardly of the upper surface of the original plate-shaped raw material W and a bottom surface WB′′ which is slightly raised relative to the lower surface of the original plate-shaped raw material W.
- a pair of upper and lower press dies are used to shape the margin of the boss WB by a finishing operation, thus manufacturing the disk member 1 as a final product (see FIG. 4 ( d )).
- Patent literature 1 Japanese Laid-Open Patent Application No. 2002-239663.
- the pressing surface (lower surface) of the upper die 5 is formed with an annular recess 5 A which is to be filled by a top portion of the burring area Wb while the pressing surface (upper surface) of the lower die 6 is formed with an annular projection 6 A which is to pound up a bottom portion of the burring area Wb.
- the distal end (top end) of the burring area Wb is placed into the annular recess 5 A of the upper die 5 while the base (bottom end) of the burring area Wb is supported by the annular projection 6 A of the lower die 6 , and under this condition, the upper die 5 is lowered to cause a plastic deformation of the burring area Wb between the annular recess 5 A of the upper die 5 and the annular projection 6 A as well as an inwardly adjacent annular recess 6 B of the lower die 6 to fill therebetween.
- the burring area Wb is in the form of a truncated cone which is tapered upwardly and that the shaping process takes place in a manner such that the boss WB assumes a position subsequent to the swaging step which is raised upwardly of the upper surface of the original plate-shaped raw material W ( FIG. 4 ( d )).
- the boss is formed so as to project above the body in the same direction as the direction in which the burring area is caused to rise to its feet.
- the burring area Wb moves more easily in the radially outward direction than into the annular recess 5 A of the upper die 5 (see FIG. 5 ), and it is found that this explains for a failure of filling the annular recess 5 A of the upper die 5 up to its corner 5 A′ during the plastic deformation of the burring area Wb.
- the present invention relates to a method of manufacturing a disk member comprising a piercing step of forming a through-opening centrally through a plate-shaped raw material, a burring step of causing the margin of through-opening of the plate-shaped raw material to rise to its feet toward one side thereof to form a substantially cylindrical burring area, and a forging step of causing the burring area to undergo a plastic deformation to form a cylindrical boss and a disk-shaped body which is located outwardly of the boss; in which at least one end of the cylindrical boss is formed to project beyond the end face of the body which is located on the opposite side from the direction in which the burring area is caused to rise to its feet.
- one end of the cylindrical boss is formed so as to project in the opposite direction from the direction in which the burring area is caused to rise to its feet, and accordingly the burring area which undergoes a plastic deformation is less susceptible to a movement in the radially outward direction.
- FIG. 1 (a) is a view of a manufacturing step of a first embodiment according to the present invention; (b) is a view of a manufacturing step which follows (a); (c) is a view of a manufacturing step which follows (b); and (d) is a view of a manufacturing step which follows (c);
- FIG. 2 is a cross section of an upper die, a lower die and a plate-shaped raw material which are used in the manufacturing step shown in FIG. 1 (c);
- FIG. 3 is a cross section of a disk member which is completed as a final product by the manufacturing steps shown in FIG. 1 ;
- FIG. 4 (a) is a view of a manufacturing step used in the prior art; (b) is a view of a manufacturing step which follows (a); (c) is a view of a manufacturing step which follows (b); and (d) is a view of a manufacturing step which follows (c);
- FIG. 5 is a cross section of an upper die, a lower die and a plate-shaped raw material used in the step shown in FIG. 4 ( c );
- FIG. 6 is a cross section, to an enlarged scale, of an essential part of a disk member 1 manufactured according to the prior art
- FIG. 7 (a) is a view of a manufacturing step according to a second embodiment of the present invention. and (b) is a view of a manufacturing step which follows (a);
- FIG. 8 is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown in FIG. 7 ;
- FIG. 9 (a) is a view of a manufacturing step according to a third embodiment of the present invention. and (b) is a view of a manufacturing step which follows (a);
- FIG. 10 is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown in FIG. 9 ;
- FIG. 11 (a) is a view showing an manufacturing step according to a fourth embodiment of the present invention, and (b) is a view of a manufacturing step which follows (a);
- FIG. 12 is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown in FIG. 11 ;
- FIG. 13 is a cross section of an essential part of a disk member manufactured by another embodiment of the present invention.
- FIG. 14 is a cross section of an essential part of a disk member manufactured according to a further embodiment of the present invention.
- FIG. 1 shows steps for manufacturing a disk member 1 in accordance with the present invention.
- the disk member 1 as a final product manufactured according to the present embodiment will be described first.
- the disk member 1 of the present embodiment is intended to be used as a swash plate of a swash plate compressor.
- the disk member 1 comprises a centrally located, substantially cylindrical boss 1 B having an increased wall thickness, and a disk-shaped body 1 A continuing from the boss 1 B and extending radially outward.
- the boss 1 B has a wall thickness t 1 (axial size) which is greater than the wall thickness t 2 of the body 1 A or the sheet thickness T of the original plate-shaped raw material W shown in FIG. 1 .
- a lower surface 1 a which represents a lower end of the boss 1 B projects downwardly beyond the lower surface 1 b of the body 1 A.
- the boss 1 B is centrally formed with a vertically extending through-opening 1 F.
- the boss 1 B has a size difference between an external diameter and an internal diameter of the lower surface 1 a or a radial size t 3 , which is chosen substantially equal to the wall thickness t 1 of the boss 1 B.
- the lower surface 1 a of the boss 1 B projects downwardly beyond the lower surface of the original plate-shaped raw material W or the lower surface 1 b of the body 1 A.
- a boundary 1 C between the lower surface 1 b of the body 1 A and the boss 1 B is shaped to be arcuate in section.
- a boundary 1 D between the top surface 1 d of the body 1 A and the top surface 1 e of the boss 1 B is shaped to be a shallow annular recess.
- the disk member 1 is intended to be used as a swash plate of a swash plate compressor, and an attachment is fitted into the through-opening 1 F in the boss 1 B while either top surface 1 d or lower surface 1 b of the body 1 A is disposed in sliding contact with a semi-spherical shoe.
- a plate-shaped raw material W which is cut into a circular form is provided, as shown in FIG. 1 ( a ).
- the plate-shaped raw material W has an external diameter D′ and a sheet thickness T which are chosen to be equal to the external diameter D of the body 1 A of the disk member 1 as a final product shown in FIG. 3 and the wall thickness t 2 of the body 1 A.
- An inexpensive hot rolled steel sheet such as S45C, for example, is preferred for the plate-shaped raw material W.
- a through-opening Wa having a required internal diameter is pierced centrally in the plate-shaped raw material W ( FIG. 1 ( a )).
- the through-opening Wa is circular in configuration, and has a center which coincides with the center of the plate-shaped raw material W.
- the piercing step which forms the through-opening Wa in the plate-shaped raw material W may take place by a laser cutting operation or a press stamping operation, but the press stamping operation is preferred for purpose of mass production.
- this burring step takes place by using a die, not shown, having a guide opening of a greater diameter than the diameter of the through-opening Wa of the plate-shaped raw material W and disposed thereabove and an elevatable rod-shaped punch, not shown, which is disposed below the through-opening Wa in the plate-shaped raw material W.
- a die not shown
- an elevatable rod-shaped punch not shown
- the entire circumferential area of the margin of the through-opening Wa is caused to rise to its feet upwardly, as shown in FIG. 1 ( b ), thus forming a sleeve-shaped burring area Wb in the form of a truncated cone which is tapered upwardly and a body 1 A which is disposed radially outward thereof.
- the inner periphery Wb′ of the burring area Wb has an internal diameter which is on the order of twice the internal diameter of the original through-opening Wa.
- the inner periphery of the burring area Wb has a top end which is tapered, gradually decreasing the diameter.
- an arrangement is made so that at the end of the burring step, the internal diameter D 1 at the top end of the inner periphery Wb′ coincides with the internal diameter of a through-opening 1 F in the boss 1 B of the disk member 1 as a final product.
- cracks in the folded portions can be prevented from occurring by merely applying a lubricant to the die or the punch or directly applying a lubricant to the margin of the through-opening Wa.
- the margin of the through-opening Wa may be softened as by annealing prior to the burring step.
- the operation transfers to a swaging (forging) operation.
- the swaging (forging) step takes place by using an upper die 5 and a lower die 6 which have their pressing surfaces disposed in opposing relationship and a punch 4 which is passed through the burring area Wb to support it, as shown in FIG. 2 .
- the inner periphery Wb′ of the burring area Wb is supported by the punch 4 , and under this condition, the lower die 6 is fixed at a given elevation while the upper die 5 is lowered by elevating means, not shown.
- the cross-sectional configurations of the pressing surfaces of the upper die 5 and the lower die 6 used in the present embodiment are formed in a manner opposite to the conventional arrangement.
- the pressing surface (lower surface) of the upper die 5 is formed with an annular projection 5 A which bulges toward the lower die 6 located therebelow, whereby an annular recess 5 B is formed at a location adjacent to and located inwardly thereof.
- the annular projection 5 A has a diameter which is slightly less than the external diameter of the top end of the burring area Wb.
- the pressing surface (top surface) of the lower die 6 is formed with an annular recess 6 A.
- the annular recess 6 A has an internal diameter which is slightly greater than the external diameter of bottom end portion Wb′′ which represents the base of the burring area Wb′.
- the annular projection 5 A on the upper die 5 abuts against the top end of the burring area Wb while the plate-shaped raw material W is supported by the pressing surface (top surface) of the lower die 6 , and further compresses the burring area Wb downward. At this time, the burring area Wb is supported from the inside by the punch 4 .
- the cross-sectional configurations of the pressing surfaces of the upper die 5 and the lower die 6 of the present embodiment are chosen to be opposite from those in a conventional arrangement, there is no displacement of the burring area Wb radially outward as the upper die 5 is lowered to cause a plastic deformation of the burring area Wb, allowing the annular recess 6 A in the lower die 6 to be easily filled ( FIG. 2 ). In addition, the top end of the burring area Wb is easily filled into the annular recess 5 B in the upper die 5 .
- a cylindrical boss 1 B having a lower surface 1 a and an upper surface 1 e which are annular flat surfaces disposed orthogonal to the axis and a body 1 A which is disposed outwardly thereof, and the boss 1 B is formed projecting beyond the lower surface of the plate-shaped raw material W (or the lower surface of the body 1 A).
- the lower surface 1 a of the boss 1 B which represents the bottom end is formed so as to project downwardly beyond the lower surface 1 b of the body 1 A, which is disposed on the opposite side from the direction in which the burring area Wb is caused to rise to its feet, while the upper surface 1 e is formed so as to be recessed below the upper surface 1 d of the body 1 A.
- a boundary region 1 D which is formed by a shallow annular groove conforming to the cross-sectional configuration of the annular projection 5 A of the upper die 5 is formed at a location adjacent to and outward of the upper surface 1 e of the boss 1 B.
- an arcuate boundary region 1 C which conforms to the cross-sectional configuration of the edge of the annular recess 6 A of the lower die 6 is formed at a boundary between the lower surface 1 a of the boss 1 B and the body 1 A which is disposed outwardly thereof. Because the inner periphery of the boss 1 B is supported by the punch 4 , a through-opening 1 F is shaped which has a uniform internal diameter over the entire axial extent thereof. Finally, the boss 1 B has a wall thickness t 1 , which is greater than the wall thickness t 2 of the body 1 A.
- the plate-shaped raw material W is shaped into substantially the same configuration as the disk member 1 as a final product which is shown in FIG. 3 . It is to be noted that during the swaging step, the outer peripheral surface and the upper and the lower surface of the body 1 A may be supported by necessary support means which are disposed in a surrounding relationship so as to constrain the outer peripheral surface of the body 1 A.
- the boss 1 B may also be formed by utilizing the upper die 5 , the lower die 6 and the burring area Wb which are disposed in an inverted manner from the illustration of FIG. 2 . If the swaging operation takes place under this condition, it is possible to form the boss 1 B having one axial end which projects in a direction opposite from the direction in which the burring area Wb is caused to rise to its feet.
- the operation transfers to a finishing step.
- the finishing step press operations are applied to portions adjacent to and outward of the boss 1 B in a concentrated manner using metal molds, not shown, and when the finishing step is completed, the boundary region 1 C is shaped to be more strongly arcuate in section to form an annular groove having a shallow depth which surrounds the boss 1 B, as shown in FIG. 1 ( d ), and thus the disk member 1 is shaped so as to be equivalent to a completed product shown in FIG. 3 .
- the finishing step can be omitted.
- the lower surface 1 b and the upper surface 1 d of the body 1 A of the disk member 1 which provide sliding surfaces with respect to a semi-spherical shoe or a piston are subject to a surface roughening, and the disk member 1 is chamfered at required locations and a surface coating is applied as required to complete the disk member 1 as the final product ( FIG. 3 ).
- the upper die 5 and the lower die 6 which are used in the swaging operation shown in FIGS. 1 ( c ) and 2 are formed in the manner mentioned above, and the upper die 5 is lowered for operation. Accordingly, during a plastic deformation of the burring area Wb which occurs between the annular projection 5 A of the upper die 5 and the annular recess 6 A of the lower die 6 , the burring area Wb is less susceptible to a movement in the radially outward direction, and accordingly, the burring area which undergoes a plastic deformation is completely filled into the annular recess 5 B of the upper die 5 and the annular recess 6 A of the lower die 6 .
- the lower surface 1 a of the boss 1 B which represents the bottom end is formed so as to project below the lower surface 1 b of the body 1 A.
- the lower surface 1 a of the boss 1 B which is located on the opposite side from the direction in which the burring area Wb is caused to rise to its feet is formed so as to project beyond the lower surface 1 b of the body 1 A which is located outwardly thereof.
- FIG. 7 shows a second embodiment of the present invention.
- the cross-sectional configurations of the pressing surfaces of the upper die 5 and the lower die 6 used in the swaging step as shown in FIG. 7 ( a ) are changed, whereby the cross-sectional configurations of the boss 1 B and associated parts are different from those of the first embodiment shown in FIG. 1 ( c ). Since the piercing step for the plate-shaped raw material W and the subsequent burring step remain the same as in the first embodiment, related Figures and corresponding description are omitted.
- the upper die 5 , the lower die 6 and the punch 4 which are similar to those shown in FIG. 2 are used to compress the burring area Wb in the axial direction to form the boss 1 B.
- the lower surface 1 a of the boss 1 B which represents the bottom end is formed so as to project below the body 1 A, thus on the opposite side from the direction in which the burring area Wb is caused to rise to its feet ( FIG. 7 ( a )).
- the upper surface 1 e of the boss 1 B is recessed below the upper surface 1 d of the body 1 A.
- the swaging step also shapes the through-opening 1 F.
- the upper boundary region 1 D is shaped so as to be gently tapered
- the lower boundary region 1 C is also shaped to be tapered.
- finishing steps takes place in the similar manner as in the first embodiment to shape the junction between the boundary region 1 C and a lower surface 1 b into an arcuate configuration ( FIG. 7 ( b )).
- a chamferring, a surface roughening, and a coating are applied at required locations in the similar manner as in the first embodiment to complete the steps of manufacturing the disk member 1 as a final product ( FIG. 8 ).
- the second embodiment described above is capable of achieving a similar functioning and effects as in the first embodiment.
- FIG. 9 shows a third embodiment of the present invention.
- the boss 1 B and associated parts have different cross-sectional configurations from those in the first embodiment shown in FIG. 1 ( c ).
- the piercing step and the burring step which take place with respect to the plate-shaped raw material W remain unchanged from the first embodiment, and therefore will not be described.
- the burring area Wb is compressed axially to form the boss 1 B ( FIG. 9 ( a )).
- the boss 1 B has an upper surface 1 e which is coplanar with an upper surface 1 d of the body 1 A and a lower surface 1 a which projects downwardly of the lower surface 1 b of the body 1 A on the opposite side from the direction in which the burring area Wb is caused to rise to its feet. Accordingly, a through-opening 1 F is shaped during the swaging step, and a lower boundary region 1 C is shaped to be tapered.
- a finishing step takes place in the similar manner as in the first embodiment, shaping a junction between the boundary region 1 C and a lower surface 1 b into an arcuate configuration ( FIG. 9 ( b )).
- a boundary region 1 D is formed which comprises an annular groove having a shallow depth and representing a boundary between the upper surface 1 e of the boss 1 B and the upper surface 1 d of the body 1 A.
- a chamferring, a surface roughening and a coating are applied at required locations in the similar manner as in the first embodiment, completing the steps of manufacturing the disk member 1 as a final product ( FIG. 10 ).
- the third embodiment is capable of achieving a similar functioning and effects as in the first embodiment.
- FIG. 11 shows a fourth embodiment of the present invention.
- the boss 1 B and associated parts have cross-sectional configurations which are different from those shown in the first embodiment illustrated in FIG. 1 ( c ).
- the piercing step and the burring step which take place with respect to the plate-shaped raw material W remain unchanged from the first embodiment, and therefore will not be described.
- an upper die 5 which is similar to a conventional one shown in FIG. 5
- a lower die 6 and a punch 4 which are identical with those shown in FIG. 2 are used to compress the burring area Wb axially to form a boss 1 B ( FIG. 11 ( a )).
- the swaging step shapes a through-opening 1 F and shapes an upper boundary region 1 D into an arcuate configuration as viewed in section, and also shapes a lower boundary region 1 C to be arcuate in section.
- a chamferring, a surface roughening and a coating are then applied to required locations in the similar manner as in the first embodiment to complete the steps of manufacturing the disk member 1 as a final product ( FIG. 12 ).
- the fourth embodiment is capable of achieving a similar functioning and effects as in the first embodiment.
- FIGS. 13 and 14 show disk members 1 having different cross-sectional configurations which are manufactured according to other embodiments of the present invention.
- an upper boundary region 1 D has a cross-sectional configuration which is arcuate in the similar manner as in the first embodiment while a lower boundary region 1 C is shaped to be tapered.
- the arrangement is identical with the disk member 1 of the first embodiment, and disk member 1 is manufactured by similar manufacturing steps as used in the first embodiment.
- the both boundary regions 1 C and 1 D of the disk member 1 are arcuate in section.
- the arrangement is similar to the disk member 1 of the first embodiment shown in FIG. 3 , and the disk member 1 is manufactured by similar manufacturing steps as used in the first embodiment.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
“MEANS TO SOLVE” A burring area Wb is axially compressed from above and from below between an upper die 5 and a lower die 6 to undergo a plastic deformation, thereby forming a cylindrical boss 1B. A pressing surface of the lower die 6 is formed with an annular recess 6A, whereby the burring area Wb is less susceptible to move radially outward in the process of plastic deformation. Accordingly, a base (a bottom portion) of the burring area Wb fills the annular recess 6A without leaving any space.
“EFFECT” A cylindrical boss 1B having no hiatus in its axial end can be formed.
Description
- The present invention relates to a method of manufacturing a disk member, and more particularly, to a method of manufacturing a disk member which is preferred for use as a swash plate of a swash plate compressor, for example.
- A method of manufacturing a disk member which is used for a swash plate of a swash plate compressor is known in the art (see
patent literature 1, for example). - According to the
patent literature 1, adisk member 1 is manufactured by manufacturing steps shown inFIG. 4 . Specifically, a through-opening Wa is initially formed through the center of a plate-shaped raw material W in the form of a disk, as shown inFIG. 4 (a). A burring operation is then applied to the margin of the through-opening Wa to cause the margin to rise upward to its feet to shape a burring area Wb in the form of a truncated cone, as shown inFIG. 4 (b). - A
punch 4 is then passed through the inside of the burring area Wb, as shown inFIG. 5 , and the burring area Wb is strongly compressed from above and from below in the axial direction between anupper die 5 and alower die 6, thus causing a plastic deformation of the burring area around the through-opening Wa to form a boss WB having a greater wall thickness than the original wall thickness t of the plate-shaped raw material W (see FIGS. 4 (c) and 5). This operation also forms a body WA extending radially outward and continuing from the boss WB. This step is referred to as a “swaging step” in the art. Thus, according to the prior art, the boss WB has a top surface WB′ which is swollen upwardly of the upper surface of the original plate-shaped raw material W and a bottom surface WB″ which is slightly raised relative to the lower surface of the original plate-shaped raw material W. - Subsequent to the swaging step, a pair of upper and lower press dies are used to shape the margin of the boss WB by a finishing operation, thus manufacturing the
disk member 1 as a final product (seeFIG. 4 (d)). - Patent literature 1: Japanese Laid-Open Patent Application No. 2002-239663.
- With the manufacturing method of the prior art as mentioned above, there is a disadvantage that when the swaging step illustrated in FIGS. 4 (c) and 5 is completed, a hiatus is likely to occur around the outer periphery of the top end of the boss WB, as indicated by X in
FIG. 6 . - An investigation by the inventor of the present Application revealed that such hiatus of the boss WB is caused by a mechanism as mentioned below. Specifically, in the prior art practice, the pressing surface (lower surface) of the
upper die 5 is formed with anannular recess 5A which is to be filled by a top portion of the burring area Wb while the pressing surface (upper surface) of thelower die 6 is formed with anannular projection 6A which is to pound up a bottom portion of the burring area Wb. - The distal end (top end) of the burring area Wb is placed into the
annular recess 5A of theupper die 5 while the base (bottom end) of the burring area Wb is supported by theannular projection 6A of thelower die 6, and under this condition, theupper die 5 is lowered to cause a plastic deformation of the burring area Wb between theannular recess 5A of theupper die 5 and theannular projection 6A as well as an inwardly adjacentannular recess 6B of thelower die 6 to fill therebetween. - It is to be noted that during this process, the burring area Wb is in the form of a truncated cone which is tapered upwardly and that the shaping process takes place in a manner such that the boss WB assumes a position subsequent to the swaging step which is raised upwardly of the upper surface of the original plate-shaped raw material W (
FIG. 4 (d)). In other words, the boss is formed so as to project above the body in the same direction as the direction in which the burring area is caused to rise to its feet. Accordingly, during the plastic deformation as the burring area Wb is compressed from above and from below by theupper die 5 and thelower die 6, the burring area Wb moves more easily in the radially outward direction than into theannular recess 5A of the upper die 5 (seeFIG. 5 ), and it is found that this explains for a failure of filling theannular recess 5A of theupper die 5 up to itscorner 5A′ during the plastic deformation of the burring area Wb. - An issue that a hiatus as indicated by X in
FIG. 6 is likely to occur around the outer periphery of the top end of the boss WB when manufactured according to the prior art manufacturing method due to the described cause has been pointed out in the art. - It is then an object of the present invention to provide a method of manufacturing a disk member which is free from a hiatus around a boss.
- Specifically, the present invention relates to a method of manufacturing a disk member comprising a piercing step of forming a through-opening centrally through a plate-shaped raw material, a burring step of causing the margin of through-opening of the plate-shaped raw material to rise to its feet toward one side thereof to form a substantially cylindrical burring area, and a forging step of causing the burring area to undergo a plastic deformation to form a cylindrical boss and a disk-shaped body which is located outwardly of the boss; in which at least one end of the cylindrical boss is formed to project beyond the end face of the body which is located on the opposite side from the direction in which the burring area is caused to rise to its feet.
- With the manufacturing method mentioned above, one end of the cylindrical boss is formed so as to project in the opposite direction from the direction in which the burring area is caused to rise to its feet, and accordingly the burring area which undergoes a plastic deformation is less susceptible to a movement in the radially outward direction.
- Accordingly, during the manufacture of a disk member, the occurrence of a hiatus of the boss can be prevented.
- “
FIG. 1 ” (a) is a view of a manufacturing step of a first embodiment according to the present invention; (b) is a view of a manufacturing step which follows (a); (c) is a view of a manufacturing step which follows (b); and (d) is a view of a manufacturing step which follows (c); - “
FIG. 2 ” is a cross section of an upper die, a lower die and a plate-shaped raw material which are used in the manufacturing step shown inFIG. 1 (c); - “
FIG. 3 ” is a cross section of a disk member which is completed as a final product by the manufacturing steps shown inFIG. 1 ; - “
FIG. 4 ” (a) is a view of a manufacturing step used in the prior art; (b) is a view of a manufacturing step which follows (a); (c) is a view of a manufacturing step which follows (b); and (d) is a view of a manufacturing step which follows (c); - “
FIG. 5 ” is a cross section of an upper die, a lower die and a plate-shaped raw material used in the step shown inFIG. 4 (c); - “
FIG. 6 ” is a cross section, to an enlarged scale, of an essential part of adisk member 1 manufactured according to the prior art; - “
FIG. 7 ” (a) is a view of a manufacturing step according to a second embodiment of the present invention; and (b) is a view of a manufacturing step which follows (a); - “
FIG. 8 ” is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown inFIG. 7 ; - “
FIG. 9 ” (a) is a view of a manufacturing step according to a third embodiment of the present invention; and (b) is a view of a manufacturing step which follows (a); - “
FIG. 10 ” is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown inFIG. 9 ; - “
FIG. 11 ” (a) is a view showing an manufacturing step according to a fourth embodiment of the present invention, and (b) is a view of a manufacturing step which follows (a); - “
FIG. 12 ” is a cross section, to an enlarged scale, of an essential part of a disk member manufactured by the manufacturing steps shown inFIG. 11 ; - “
FIG. 13 ” is a cross section of an essential part of a disk member manufactured by another embodiment of the present invention; and - “
FIG. 14 ” is a cross section of an essential part of a disk member manufactured according to a further embodiment of the present invention. -
-
- 1 . . . disk member
- 1A . . . body
- 1B . . . boss
- 1 a . . . lower surface of
boss 1 B - 1 b . . . lower surface of
body 1A - 5 . . . upper die (first die)
- 5A . . . annular projection
- 5B . . . annular recess
- 6 . . . lower die (second die)
- 6A . . . annular recess
- W . . . plate-shaped raw material
- Wa . . . through-opening
- Wb . . . burring area
- Referring to the drawings, several embodiments of the present invention will now be described.
FIG. 1 shows steps for manufacturing adisk member 1 in accordance with the present invention. - Before describing the manufacturing steps of the present embodiment with reference to
FIG. 1 , thedisk member 1 as a final product manufactured according to the present embodiment will be described first. Thedisk member 1 of the present embodiment is intended to be used as a swash plate of a swash plate compressor. Specifically, as shown inFIG. 3 , thedisk member 1 comprises a centrally located, substantiallycylindrical boss 1B having an increased wall thickness, and a disk-shaped body 1A continuing from theboss 1B and extending radially outward. Theboss 1B has a wall thickness t1 (axial size) which is greater than the wall thickness t2 of thebody 1A or the sheet thickness T of the original plate-shaped raw material W shown inFIG. 1 . Alower surface 1 a which represents a lower end of theboss 1B projects downwardly beyond thelower surface 1 b of thebody 1A. Theboss 1B is centrally formed with a vertically extending through-opening 1F. - The
boss 1B has a size difference between an external diameter and an internal diameter of thelower surface 1 a or a radial size t3, which is chosen substantially equal to the wall thickness t1 of theboss 1B. Thelower surface 1 a of theboss 1B projects downwardly beyond the lower surface of the original plate-shaped raw material W or thelower surface 1 b of thebody 1A. - A
boundary 1C between thelower surface 1 b of thebody 1A and theboss 1B is shaped to be arcuate in section. On the other hand, aboundary 1D between thetop surface 1 d of thebody 1A and thetop surface 1 e of theboss 1B is shaped to be a shallow annular recess. - As mentioned previously, the
disk member 1 is intended to be used as a swash plate of a swash plate compressor, and an attachment is fitted into the through-opening 1F in theboss 1B while eithertop surface 1 d orlower surface 1 b of thebody 1A is disposed in sliding contact with a semi-spherical shoe. - The steps of manufacturing the
disk member 1 according to the present embodiment will be described with reference toFIG. 1 . - Initially, a plate-shaped raw material W which is cut into a circular form is provided, as shown in
FIG. 1 (a). The plate-shaped raw material W has an external diameter D′ and a sheet thickness T which are chosen to be equal to the external diameter D of thebody 1A of thedisk member 1 as a final product shown inFIG. 3 and the wall thickness t2 of thebody 1A. An inexpensive hot rolled steel sheet such as S45C, for example, is preferred for the plate-shaped raw material W. - A through-opening Wa having a required internal diameter is pierced centrally in the plate-shaped raw material W (
FIG. 1 (a)). The through-opening Wa is circular in configuration, and has a center which coincides with the center of the plate-shaped raw material W. The piercing step which forms the through-opening Wa in the plate-shaped raw material W may take place by a laser cutting operation or a press stamping operation, but the press stamping operation is preferred for purpose of mass production. - When the piercing step of the plate-shaped raw material W is completed, the operation transfers then to a burring step shown in
FIG. 1 (b). In the similar manner as in the conventional arrangement, this burring step takes place by using a die, not shown, having a guide opening of a greater diameter than the diameter of the through-opening Wa of the plate-shaped raw material W and disposed thereabove and an elevatable rod-shaped punch, not shown, which is disposed below the through-opening Wa in the plate-shaped raw material W. Thus, by driving the punch which is disposed below into and out of the guide opening in the die, the margin of the through-opening Wa is gradually folded upwardly of the plate-shaped raw material W toward the guide opening in the die. - When the burring step is completed, the entire circumferential area of the margin of the through-opening Wa is caused to rise to its feet upwardly, as shown in
FIG. 1 (b), thus forming a sleeve-shaped burring area Wb in the form of a truncated cone which is tapered upwardly and abody 1A which is disposed radially outward thereof. - At the end of the burring step, the inner periphery Wb′ of the burring area Wb has an internal diameter which is on the order of twice the internal diameter of the original through-opening Wa. The inner periphery of the burring area Wb has a top end which is tapered, gradually decreasing the diameter. In the present embodiment, an arrangement is made so that at the end of the burring step, the internal diameter D1 at the top end of the inner periphery Wb′ coincides with the internal diameter of a through-
opening 1F in theboss 1B of thedisk member 1 as a final product. - It is to be noted that during the burring step, cracks in the folded portions can be prevented from occurring by merely applying a lubricant to the die or the punch or directly applying a lubricant to the margin of the through-opening Wa. Alternatively, the margin of the through-opening Wa may be softened as by annealing prior to the burring step.
- When the burring step is completed, the operation transfers to a swaging (forging) operation.
- The swaging (forging) step takes place by using an
upper die 5 and alower die 6 which have their pressing surfaces disposed in opposing relationship and apunch 4 which is passed through the burring area Wb to support it, as shown inFIG. 2 . Specifically, the inner periphery Wb′ of the burring area Wb is supported by thepunch 4, and under this condition, thelower die 6 is fixed at a given elevation while theupper die 5 is lowered by elevating means, not shown. - It is to be noted that the cross-sectional configurations of the pressing surfaces of the
upper die 5 and thelower die 6 used in the present embodiment are formed in a manner opposite to the conventional arrangement. Specifically, the pressing surface (lower surface) of theupper die 5 is formed with anannular projection 5A which bulges toward thelower die 6 located therebelow, whereby anannular recess 5B is formed at a location adjacent to and located inwardly thereof. Theannular projection 5A has a diameter which is slightly less than the external diameter of the top end of the burring area Wb. On the other hand, the pressing surface (top surface) of thelower die 6 is formed with anannular recess 6A. Theannular recess 6A has an internal diameter which is slightly greater than the external diameter of bottom end portion Wb″ which represents the base of the burring area Wb′. - Accordingly, as the
upper die 5 is lowered by elevating means, theannular projection 5A on theupper die 5 abuts against the top end of the burring area Wb while the plate-shaped raw material W is supported by the pressing surface (top surface) of thelower die 6, and further compresses the burring area Wb downward. At this time, the burring area Wb is supported from the inside by thepunch 4. - In this manner, by compressing the burring area Wb in the axial direction from above and from below in a concentrated manner by the
upper die 5 and thelower die 6 to cause a plastic deformation of the burring area Wb while maintaining the internal diameter of the burring area Wb around the inner periphery of the top end thereof, theboss 1B having an increased wall thickness is formed (FIG. 1 (c)). - Since the cross-sectional configurations of the pressing surfaces of the
upper die 5 and thelower die 6 of the present embodiment are chosen to be opposite from those in a conventional arrangement, there is no displacement of the burring area Wb radially outward as theupper die 5 is lowered to cause a plastic deformation of the burring area Wb, allowing theannular recess 6A in thelower die 6 to be easily filled (FIG. 2 ). In addition, the top end of the burring area Wb is easily filled into theannular recess 5B in theupper die 5. - When the swaging step is completed in this manner, there are formed a
cylindrical boss 1B having alower surface 1 a and anupper surface 1 e which are annular flat surfaces disposed orthogonal to the axis and abody 1A which is disposed outwardly thereof, and theboss 1B is formed projecting beyond the lower surface of the plate-shaped raw material W (or the lower surface of thebody 1A). - More specifically, the
lower surface 1 a of theboss 1B which represents the bottom end is formed so as to project downwardly beyond thelower surface 1 b of thebody 1A, which is disposed on the opposite side from the direction in which the burring area Wb is caused to rise to its feet, while theupper surface 1 e is formed so as to be recessed below theupper surface 1 d of thebody 1A. Aboundary region 1D which is formed by a shallow annular groove conforming to the cross-sectional configuration of theannular projection 5A of theupper die 5 is formed at a location adjacent to and outward of theupper surface 1 e of theboss 1B. In addition, anarcuate boundary region 1C which conforms to the cross-sectional configuration of the edge of theannular recess 6A of thelower die 6 is formed at a boundary between thelower surface 1 a of theboss 1B and thebody 1A which is disposed outwardly thereof. Because the inner periphery of theboss 1B is supported by thepunch 4, a through-opening 1F is shaped which has a uniform internal diameter over the entire axial extent thereof. Finally, theboss 1B has a wall thickness t1, which is greater than the wall thickness t2 of thebody 1A. - When the swaging step shown in FIGS. 1 (c) and 2 has been completed, the plate-shaped raw material W is shaped into substantially the same configuration as the
disk member 1 as a final product which is shown inFIG. 3 . It is to be noted that during the swaging step, the outer peripheral surface and the upper and the lower surface of thebody 1A may be supported by necessary support means which are disposed in a surrounding relationship so as to constrain the outer peripheral surface of thebody 1A. - It is to be noted that the
boss 1B may also be formed by utilizing theupper die 5, thelower die 6 and the burring area Wb which are disposed in an inverted manner from the illustration ofFIG. 2 . If the swaging operation takes place under this condition, it is possible to form theboss 1B having one axial end which projects in a direction opposite from the direction in which the burring area Wb is caused to rise to its feet. - When the swaging step has been completed, the operation then transfers to a finishing step. During the finishing step, press operations are applied to portions adjacent to and outward of the
boss 1B in a concentrated manner using metal molds, not shown, and when the finishing step is completed, theboundary region 1C is shaped to be more strongly arcuate in section to form an annular groove having a shallow depth which surrounds theboss 1B, as shown inFIG. 1 (d), and thus thedisk member 1 is shaped so as to be equivalent to a completed product shown inFIG. 3 . - If the described swaging step is performed using the
upper die 5 and thelower die 6 which are provided with finishing configurations, the finishing step can be omitted. - Subsequently, the
lower surface 1 b and theupper surface 1 d of thebody 1A of thedisk member 1 which provide sliding surfaces with respect to a semi-spherical shoe or a piston are subject to a surface roughening, and thedisk member 1 is chamfered at required locations and a surface coating is applied as required to complete thedisk member 1 as the final product (FIG. 3 ). - As mentioned above, in the present embodiment, the
upper die 5 and thelower die 6 which are used in the swaging operation shown in FIGS. 1 (c) and 2 are formed in the manner mentioned above, and theupper die 5 is lowered for operation. Accordingly, during a plastic deformation of the burring area Wb which occurs between theannular projection 5A of theupper die 5 and theannular recess 6A of thelower die 6, the burring area Wb is less susceptible to a movement in the radially outward direction, and accordingly, the burring area which undergoes a plastic deformation is completely filled into theannular recess 5B of theupper die 5 and theannular recess 6A of thelower die 6. Thelower surface 1 a of theboss 1B which represents the bottom end is formed so as to project below thelower surface 1 b of thebody 1A. Thus, thelower surface 1 a of theboss 1B which is located on the opposite side from the direction in which the burring area Wb is caused to rise to its feet is formed so as to project beyond thelower surface 1 b of thebody 1A which is located outwardly thereof. - Accordingly, the occurrence of a hiatus in the outer periphery of the
boss 1B as experienced in the prior art can be prevented, allowing a method of manufacturing adisk member 1 to be provided which is capable of preventing the occurrence of defective products as compared with the prior art. -
FIG. 7 shows a second embodiment of the present invention. In the second embodiment, the cross-sectional configurations of the pressing surfaces of theupper die 5 and thelower die 6 used in the swaging step as shown inFIG. 7 (a) are changed, whereby the cross-sectional configurations of theboss 1B and associated parts are different from those of the first embodiment shown inFIG. 1 (c). Since the piercing step for the plate-shaped raw material W and the subsequent burring step remain the same as in the first embodiment, related Figures and corresponding description are omitted. - In the second embodiment, subsequent to the completion of the burring step, the
upper die 5, thelower die 6 and thepunch 4 which are similar to those shown inFIG. 2 are used to compress the burring area Wb in the axial direction to form theboss 1B. Thelower surface 1 a of theboss 1B which represents the bottom end is formed so as to project below thebody 1A, thus on the opposite side from the direction in which the burring area Wb is caused to rise to its feet (FIG. 7 (a)). On the other hand, theupper surface 1 e of theboss 1B is recessed below theupper surface 1 d of thebody 1A. The swaging step also shapes the through-opening 1F. In this embodiment, theupper boundary region 1D is shaped so as to be gently tapered, and thelower boundary region 1C is also shaped to be tapered. - Subsequently, the finishing steps takes place in the similar manner as in the first embodiment to shape the junction between the
boundary region 1C and alower surface 1 b into an arcuate configuration (FIG. 7 (b)). - Finally, a chamferring, a surface roughening, and a coating are applied at required locations in the similar manner as in the first embodiment to complete the steps of manufacturing the
disk member 1 as a final product (FIG. 8 ). - The second embodiment described above is capable of achieving a similar functioning and effects as in the first embodiment.
-
FIG. 9 shows a third embodiment of the present invention. In the third embodiment, by changing the cross-sectional configurations of the pressing surfaces of theupper die 5 and thelower die 6 shown inFIG. 9 (a) which illustrates the swaging step, theboss 1B and associated parts have different cross-sectional configurations from those in the first embodiment shown inFIG. 1 (c). The piercing step and the burring step which take place with respect to the plate-shaped raw material W remain unchanged from the first embodiment, and therefore will not be described. - In the third embodiment, subsequent to the completion of the burring step, using an upper die, not shown, having a pressing surface (lower surface) which is an entirely flat surface, a
lower die 6 and apunch 4 which are similar to those shown inFIG. 2 , the burring area Wb is compressed axially to form theboss 1B (FIG. 9 (a)). Theboss 1B has anupper surface 1 e which is coplanar with anupper surface 1 d of thebody 1A and alower surface 1 a which projects downwardly of thelower surface 1 b of thebody 1A on the opposite side from the direction in which the burring area Wb is caused to rise to its feet. Accordingly, a through-opening 1F is shaped during the swaging step, and alower boundary region 1C is shaped to be tapered. - Subsequently, a finishing step takes place in the similar manner as in the first embodiment, shaping a junction between the
boundary region 1C and alower surface 1 b into an arcuate configuration (FIG. 9 (b)). At the same time, aboundary region 1D is formed which comprises an annular groove having a shallow depth and representing a boundary between theupper surface 1 e of theboss 1B and theupper surface 1 d of thebody 1A. Finally, a chamferring, a surface roughening and a coating are applied at required locations in the similar manner as in the first embodiment, completing the steps of manufacturing thedisk member 1 as a final product (FIG. 10 ). - Again, the third embodiment is capable of achieving a similar functioning and effects as in the first embodiment.
-
FIG. 11 shows a fourth embodiment of the present invention. In the fourth embodiment, by changing the cross-sectional configurations of pressing surfaces of anupper die 5 and alower die 6 used in the swaging step shown inFIG. 11 (a), theboss 1B and associated parts have cross-sectional configurations which are different from those shown in the first embodiment illustrated inFIG. 1 (c). The piercing step and the burring step which take place with respect to the plate-shaped raw material W remain unchanged from the first embodiment, and therefore will not be described. - In the fourth embodiment, upon completion of the burring step, an
upper die 5 which is similar to a conventional one shown inFIG. 5 , and alower die 6 and apunch 4 which are identical with those shown inFIG. 2 are used to compress the burring area Wb axially to form aboss 1B (FIG. 11 (a)). - When the swaging step is completed, the
upper surface 1 e of theboss 1B is shaped to bulge above theupper surface 1 d of thebody 1A while thelower surface 1 b of theboss 1B is shaped to project downwardly of thelower surface 1 b of thebody 1A on the opposite side from the direction in which the burring area Wb is caused to rise to its feet. In addition, the swaging step shapes a through-opening 1F and shapes anupper boundary region 1D into an arcuate configuration as viewed in section, and also shapes alower boundary region 1C to be arcuate in section. - Subsequently, a finishing step takes place in the similar manner as in the first embodiment, shaping both
boundary regions FIG. 11 (b)). - A chamferring, a surface roughening and a coating are then applied to required locations in the similar manner as in the first embodiment to complete the steps of manufacturing the
disk member 1 as a final product (FIG. 12 ). Again, the fourth embodiment is capable of achieving a similar functioning and effects as in the first embodiment. -
FIGS. 13 and 14 show disk members 1 having different cross-sectional configurations which are manufactured according to other embodiments of the present invention. - In the
disk member 1 shown inFIG. 13 , anupper boundary region 1D has a cross-sectional configuration which is arcuate in the similar manner as in the first embodiment while alower boundary region 1C is shaped to be tapered. In other respects, the arrangement is identical with thedisk member 1 of the first embodiment, anddisk member 1 is manufactured by similar manufacturing steps as used in the first embodiment. - In the
disk member 1 shown inFIG. 14 , the bothboundary regions disk member 1 are arcuate in section. In other respects, the arrangement is similar to thedisk member 1 of the first embodiment shown inFIG. 3 , and thedisk member 1 is manufactured by similar manufacturing steps as used in the first embodiment. - When manufacturing the
disk members 1 shown inFIGS. 13 and 14 , there are obtained a similar functioning and effects as in the first embodiment. - As described above, in accordance with the present invention, there is obtained an effect that the occurrence of a hiatus in a boss of a disk member can be prevented.
Claims (6)
1. A method of manufacturing a disk member comprising a piercing step of forming a through-opening centrally in a plate-shaped raw material, a burring step of causing the margin of the through-opening in the plate-shaped raw material to rise to its feet to one side of the plate-shaped raw material to form a substantially cylindrical burring area, and a forging step of causing the burring area to undergo a plastic deformation to form a cylindrical boss and a disk-shaped body which is located on the outside of the boss;
in which at least one end of the cylindrical boss is caused to project beyond an end face of the body which is disposed on the opposite side from the direction in which the burring area is caused to rise to its feet.
2. A method of manufacturing a disk member according to claim 1 in which the burring area is caused to undergo a plastic deformation by being compressed axially by a pressing surface of a first die and a pressing surface of a second die while the burring area is supported on the inside by a punch, thereby causing a base of the burring area to be filled into an annular recess formed in the pressing surface of the second die and thus forming the boss and the body.
3. A method of manufacturing a disk member according to claim 2 in which the pressing surface of the first die is formed with an annular projection which bulges toward the second die and the first die is moved toward the second die to bring the annular projection on the first die into abutment against the distal end of the burring area, thereby forming the boss by axially compressing the burring area between the pressing surface of the first die and the pressing surface of the second die.
4. A method of manufacturing a disk member according to claim 3 in which the boss is formed to have a wall thickness which is greater than the wall thickness of the body and the end of the boss which is disposed on the same side as the direction in which the burring area is caused to rise to its feet is formed so as to be recessed below the end face of the body which is located adjacent to and outward of the boss.
5. A method of manufacturing a disk member according to claim 3 in which the boss is formed to have a wall thickness which is greater than the wall thickness of the body and the end of the boss which is disposed on the same side as the direction in which the burring area is caused to rise to its feet is formed to be coplanar with the end face of the body which is located adjacent to and outward of the boss.
6. A method of manufacturing a disk member according to claim 3 in which the boss is formed to have a wall thickness which is greater than the wall thickness of the body and the end of the boss which is disposed on the same side as the direction in which the burring area is caused to rise to its feet is formed to project beyond the end face of the body which is located adjacent to and outward of the boss.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2003-169855 | 2003-06-13 | ||
JP2003169855A JP3617519B2 (en) | 2003-06-13 | 2003-06-13 | Manufacturing method of disk member |
PCT/JP2004/007358 WO2004110668A1 (en) | 2003-06-13 | 2004-05-28 | Method of manufacturing disk member |
Publications (1)
Publication Number | Publication Date |
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US20060144118A1 true US20060144118A1 (en) | 2006-07-06 |
Family
ID=33549389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/547,154 Abandoned US20060144118A1 (en) | 2003-06-13 | 2004-05-28 | Method for manufacturing disk member |
Country Status (5)
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US (1) | US20060144118A1 (en) |
JP (1) | JP3617519B2 (en) |
KR (1) | KR100647512B1 (en) |
HU (1) | HU229111B1 (en) |
WO (1) | WO2004110668A1 (en) |
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US20050284203A1 (en) * | 2004-06-24 | 2005-12-29 | Kato Seisakusho Co., Ltd. | Pressed work and manufacturing method thereof |
US20090282885A1 (en) * | 2008-05-16 | 2009-11-19 | Masakazu Ooka | Method of forming spring washer blind-holes into a piston for an automobile transmission |
US20140215821A1 (en) * | 2008-03-03 | 2014-08-07 | Ntn Corporation | Swash plate of a swash plate type compressor and the swash plate type compressor |
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JP4328372B2 (en) * | 2007-09-07 | 2009-09-09 | 株式会社ピーエヌ | Core metal manufacturing method, core metal and injection gear |
US8424407B2 (en) | 2009-05-20 | 2013-04-23 | Kabushiki Kaisha Pn | Core metal and injection gear, and process for manufacturing core metal |
KR101433675B1 (en) | 2013-11-07 | 2014-08-27 | 한국기계연구원 | The cold forging mold for manufacturing under driver brake piston |
JP6849212B2 (en) * | 2016-11-24 | 2021-03-24 | 株式会社カネミツ | Manufacturing method of metal parts |
JP6284666B1 (en) * | 2017-03-17 | 2018-02-28 | 日新製鋼株式会社 | Manufacturing method of hard disk spacer parts |
JP2019042774A (en) * | 2017-09-04 | 2019-03-22 | 株式会社ナカヒョウ | Manufacturing method of press molding |
JP7230828B2 (en) * | 2017-12-28 | 2023-03-01 | 日本製鉄株式会社 | Press molding method for annular parts |
CN111482514A (en) * | 2020-03-25 | 2020-08-04 | 宣城军焊焊接科技有限公司 | Stamping die capable of being manually operated |
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JP2002239663A (en) * | 2001-02-21 | 2002-08-27 | Taiho Kogyo Co Ltd | Disk member and its forming method |
-
2003
- 2003-06-13 JP JP2003169855A patent/JP3617519B2/en not_active Expired - Fee Related
-
2004
- 2004-05-28 HU HU0600112A patent/HU229111B1/en not_active IP Right Cessation
- 2004-05-28 KR KR1020057018125A patent/KR100647512B1/en active IP Right Grant
- 2004-05-28 US US10/547,154 patent/US20060144118A1/en not_active Abandoned
- 2004-05-28 WO PCT/JP2004/007358 patent/WO2004110668A1/en active Application Filing
Patent Citations (6)
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US2373901A (en) * | 1940-11-09 | 1945-04-17 | Chrysler Corp | Boss forming process |
US4270255A (en) * | 1979-03-26 | 1981-06-02 | Borg-Warner Corporation | Method of manufacturing a swash plate assembly |
US4545231A (en) * | 1982-08-16 | 1985-10-08 | Grove Valve & Regulator Company | Method of manufacturing a weld neck flange |
US4860567A (en) * | 1987-12-21 | 1989-08-29 | United Technologies Corporation | Ring forging process |
US5842580A (en) * | 1997-04-21 | 1998-12-01 | Sung Young Metal Works Co., Ltd. | Method of producing socket plate for wobble plate compressors |
US6438834B1 (en) * | 1999-09-21 | 2002-08-27 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Method of making a swash plate type compressor piston whose head portion is formed by pore-free die-casting |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050284203A1 (en) * | 2004-06-24 | 2005-12-29 | Kato Seisakusho Co., Ltd. | Pressed work and manufacturing method thereof |
US20140215821A1 (en) * | 2008-03-03 | 2014-08-07 | Ntn Corporation | Swash plate of a swash plate type compressor and the swash plate type compressor |
US9808894B2 (en) * | 2008-03-03 | 2017-11-07 | Ntn Corporation | Swash plate of a swash plate type compressor and the swash plate type compressor |
US20090282885A1 (en) * | 2008-05-16 | 2009-11-19 | Masakazu Ooka | Method of forming spring washer blind-holes into a piston for an automobile transmission |
US7823432B2 (en) * | 2008-05-16 | 2010-11-02 | Ibaraki Steel Center Co., Ltd. | Method of forming spring washer blind-holes into a piston for an automobile transmission |
Also Published As
Publication number | Publication date |
---|---|
WO2004110668A1 (en) | 2004-12-23 |
KR20050107818A (en) | 2005-11-15 |
JP3617519B2 (en) | 2005-02-09 |
JP2005000977A (en) | 2005-01-06 |
HU229111B1 (en) | 2013-08-28 |
HUP0600112A2 (en) | 2007-07-30 |
KR100647512B1 (en) | 2006-11-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TAIHO KOGYO CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAKATA, TAKASHI;REEL/FRAME:017588/0175 Effective date: 20050801 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |