JP5075713B2 - Manufacturing method for thickened press products - Google Patents

Description

  The present invention relates to a method of manufacturing a thickened press product by increasing the thickness of a rising portion rising from an inner peripheral edge of a plate-shaped main body by a press.

  2. Description of the Related Art Conventionally, for example, in a pulley piston in a continuously variable transmission of an automobile, there has been a molding method in which a rising portion such as a boss portion on an inner peripheral side or a seal groove portion on an outer peripheral side is thickened (for example, see Non-Patent Document 1) . As shown in FIG. 4, this molding method is to increase the thickness of the rising portion 32 rising from the main body portion 31 by pressing, and the mold includes a die 33, a punch 34, and a main body portion. 31, and a plate presser 36 that presses the main body 31 and the rising part 32. Here, (a) in FIG. 4 shows a state before the thickening process, (b) shows a state during the thickening process, and (c) shows a state of completion of the thickening process. As can be seen from this figure, in the process of increasing the thickness, the punch 34 that presses the rising portion 32 and the die 33 are lowered together. And the space | interval of the die | dye 33 which pinches | interposes the standup | rising part 32, and the board presser 36 spreads by this fall, and the standup | rising part 32 is thickened by this.

“Automotive Technology”, Japan Society for Automotive Technology, 1996, Vol. 50, no. 12, p. 31-37

  However, in the conventional molding method, the rising portion is inclined, and in order to make the inner peripheral surface of the rising portion a peripheral surface parallel to the axis, the inner peripheral surface is formed by post-processing. It had to be cut, cumbersome and expensive.

  The present invention has been made in order to solve the above-described conventional drawbacks, and its object is to easily and inexpensively manufacture a rising portion whose inner peripheral surface is parallel to the shaft center and is increased in thickness. An object of the present invention is to provide a method for manufacturing a thickened press product.

In order to achieve the above object, a method for manufacturing a thickened press product according to the present invention has the following configuration. That is,
The method for manufacturing a thickened press product according to the invention of claim 1 is directed to a plate-like workpiece, and an axis that faces from the main body portion toward the front and back of the main body portion inside the workpiece. A rising portion forming step of forming a rising portion that rises in a cylindrical shape on one side of the direction; and a thickening step of increasing the thickness of the rising portion. Here, in the rising portion forming process, with molding the rising portion by burring, or stop, during its molding, at the distal end portion of the tip portion of the rising portion is extended toward the axial direction The outer peripheral surface is formed parallel to the shaft center, and the outer peripheral surface base end portion of the rising portion that continues to the outer peripheral surface parallel to the shaft center at the tip portion thereof is tapered so as to spread outward toward the root side. An inclined surface inclined in a shape. And, in the thickening step, the tip side of the rising portion is crushed and placed on the proximal end side, and the sagging portion caused by the burring or squeezing at the inner peripheral surface proximal end portion of the rising portion is reduced, Alternatively, the base end portion of the rising portion is increased in thickness by extending a peripheral surface parallel to the axis of the inner peripheral surface of the rising portion toward the base end side.

According to this method for manufacturing a thickened press product, in the rising portion forming step, the tip portion of the rising portion is extended in the axial direction, and the outer peripheral surface of the tip portion is formed parallel to the axis, and The base end of the outer peripheral surface of the rising portion that follows the outer peripheral surface parallel to the axial center of the tip portion is an inclined surface that is inclined in a tapered shape so as to spread outward toward the root side. And, in the rising portion having the inclined surface, in the thickness increasing process, the tip side is crushed and placed on the base end side, so that the sagging portion of the inner peripheral surface base end portion is reduced or eliminated. The peripheral surface of the inner peripheral surface parallel to the axis extends to the base end side, whereby the base end portion of the rising portion is easily and inexpensively increased in thickness .

  A method for manufacturing a thickened press product according to a second aspect of the present invention is the method for manufacturing a thickened press product according to the first aspect, wherein the object to be processed has a hole, and the rising portion molding is performed. In the step, the rising portion is formed on the peripheral portion of the hole by the burring.

  Moreover, the manufacturing method of the thickening press product which concerns on invention of Claim 3 WHEREIN: The manufacturing method of the thickening press product of Claim 2 WHEREIN: After the said thickening process, the inner peripheral surface of the said rising part, and the said The distance from the base of the inclined surface is in the range of 1 to 1.8 times the plate thickness of the main body where the rising portion rises.

  Moreover, the manufacturing method of the thickened press product which concerns on invention of Claim 4 is a manufacturing method of the thickened press product of Claim 2 or 3, In the manufacturing method of the thickened press product, after the said thickening process, the internal peripheral surface of the said rising part And the tip of the inclined surface is in the range of 0.5 to 0.9 times the plate thickness of the main body where the rising portion rises.

According to the method for manufacturing a thickened press product according to the present invention, in the rising portion forming step, the tip portion of the rising portion is extended in the axial direction, and the outer peripheral surface of the tip portion is parallel to the axis. The tip end portion of the rising portion, which continues from the outer peripheral surface parallel to the axis, is formed as an inclined surface, and the tip end side of the rising portion is crushed in the thickening step to form the base end. crowded laid on the side, the inner peripheral surface the axis circumferential surface parallel to the by extending proximally, the rising portion whose inner peripheral surface is thickened in a parallel to the axis simply and inexpensively Can be manufactured.

  Hereinafter, the best mode for carrying out the method for manufacturing a thickened press product according to the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment of the present invention. Reference numeral 1 in the figure denotes a plate-like processing object. 2 is a thickening press product obtained by processing this workpiece 1, and this thickening press product 2 is, for example, in a clutch such as a wet multi-plate clutch attached to an automatic transmission or a torque converter, Used as a clutch piston material.

The manufacturing method of the thickened press product 2 is as follows: the inner side of the workpiece 1 with respect to the workpiece 1; one side in the direction of the axis 1b facing the front and back of the body portion 1a from the body portion 1a. 101 includes a rising portion forming step (see FIG. 2) for forming a rising portion 1c rising in a cylindrical shape, and a thickening step (see FIG. 3) for increasing the thickness of the rising portion 1c. Here, in the rising portion forming step, the rising portion 1c is formed by burring, and at the time of forming, the leading end portion 1d of the rising portion 1c extends in the direction of the axis 1b and the leading end portion 1d. And the outer peripheral surface proximal end of the rising portion 1c , which is continuous with the outer peripheral surface parallel to the axial center 1b of the distal end portion 1d, is located outward toward the root 1e. It is assumed that the inclined surface 1f is inclined in a tapered shape so as to spread. In the thickness increasing step, the leading end side of the rising portion 1c is crushed and placed on the proximal end side to reduce the sagging portion 1g generated by the burring at the proximal end portion of the inner peripheral surface of the rising portion 1c, or The base end portion 1i of the rising portion 1c is increased in thickness by extending the peripheral surface of the inner peripheral surface 1h of the rising portion 1c parallel to the axis 1b to the base end side.

  Specifically, the workpiece 1 has a hole 1j as shown in FIG. In the rising portion forming step, the rising portion 1c is formed on the peripheral portion of the hole 1j by the burring. That is, the hole 1j is a lower hole for burring.

  Specifically, the workpiece 1 is made of a metal such as steel (steel plate), and the main body 1a is formed in a disc shape, and the circular hole 1j is opened in the center. And the thickening press product 2 obtained by processing this workpiece 1 includes a main body portion 1a, and a cylindrical, thickened rising portion 1c rising from the entire inner peripheral edge of the main body portion 1a. It has a rotating body shape with the axis 1b as an axis.

  In the manufacturing method of the thickened press product 2, the first die 3 used in the rising portion molding step includes a first die 4, a knockout 5, and a first punch 6, as shown in FIG. . Here, the first die 4 presses the workpiece 1 (specifically, the main body 1a) on one side 101 (upper side) in the direction of the axis 1b. The first die 4 has a cylindrical shape, and the tip end portion of the inner peripheral surface 4a is inclined in a tapered shape so as to spread outward toward the tip end side in order to form the inclined surface 1f of the rising portion 1c. The inner peripheral inclined surface 4b is formed. The knockout 5 supports the workpiece 1 (specifically, the main body 1a) on the other side 102 (lower side) opposite to the one side 101, and has a cylindrical shape. . The 1st punch 6 presses the peripheral part of the hole 1j in the workpiece 1 from the said other side 102 (lower side). The first punch 6 has a columnar shape and is disposed inside the knockout 5, and enters the first die 4 in the process of pressing the peripheral edge of the hole 1 j in the workpiece 1.

  Therefore, in the rising portion molding process, as shown in FIG. 2, the peripheral portion of the hole 1j is pressed by the first punch 6 by using the first die 3 so that the peripheral portion is raised. The rising portion 1c is formed (burring). At this time, due to the inner peripheral inclined surface 4b of the first die 4, the rising portion 1c becomes the inclined surface 1f whose outer peripheral surface base end portion is inclined in a tapered shape. A sagging portion 1g by burring is formed at the proximal end portion of the inner peripheral surface of the rising portion 1c.

  Moreover, the 2nd metal mold | die 7 used for a thickening process is provided with the 2nd die | dye 8, the pad 9, and the 2nd punch 10 as shown in FIG. Here, the second die 8 supports the workpiece 1 (specifically, the main body 1a) on the other side 102 (lower side) opposite to the one side 101 in the axial center 1b direction. Yes, it has a cylindrical shape. The pad 9 presses the workpiece 1 on one side 101 (upper side) in the direction of the axis 1b. The pad 9 has a cylindrical shape, and the inner peripheral surface 9a has a tip end portion that presses the inclined surface 1f of the rising portion 1c, so that the tip end portion is inclined outwardly so as to spread outward. It becomes the surface 9b. The 2nd punch 10 presses the front-end | tip of the said rising part 1c in the workpiece 1 from said one side 101 (upper side). The second punch 10 has a columnar shape having a stepped portion 10a facing the other side 102 (lower side) on the peripheral surface, and is disposed inside the pad 9, and the tip of the rising portion 1c is stepped. In the process of pressing by the portion 10a, the second die 8 is entered.

  Therefore, in the thickening step, as shown in FIG. 3, by using the second die 7 and pressing the tip of the rising portion 1c with the second punch 10, the base end portion 1i of the rising portion 1c is obtained. Increase the thickness. That is, by using the second punch 10, the leading end side of the rising portion 1 c is crushed and placed on the proximal end side to reduce or eliminate the sagging portion 1 g, thereby increasing the base end portion 1 i of the rising portion 1 c. To do. At this time, most of the indentation pressure by the second punch 10 advances straight, and the material of the rising portion 1c enters the space S (see FIG. 2) formed by the sag portion 1g at the proximal end portion of the inner peripheral surface of the rising portion 1c. And increase in thickness. Here, the material of the rising portion 1c is partly dispersed by the pushing pressure and is directed to the inclined surface 1f side, but is constrained by the inner peripheral inclined surface 9b of the pad 9, thereby diffusing (flowing). As a result, the force is directed toward the space S, which is easy to flow, without causing folding defects or buckling.

  By the way, after this thickening step, the interval W1 between the inner peripheral surface 1h of the rising portion 1c and the root 1e of the inclined surface 1f is 1 to 1.8 times the plate thickness T of the main body portion 1a where the rising portion 1c rises. Is preferably in the range of 1 to 1.5 times. And after this thickness increase process, it is preferable that the space | interval W2 of the internal peripheral surface 1h of the rising part 1c and the front-end | tip 1k of the inclined surface 1f exists in the range of 0.5-0.9 times the said plate | board thickness T. In particular, it should be in the range of 0.7 to 0.9 times. However, the interval W1 and the interval W2 are not limited to these ranges.

According to the method for manufacturing the thickened press product 2, in the rising portion forming step, the tip portion 1d of the rising portion 1c is extended in the direction of the axis 1b, and the outer peripheral surface of the tip portion 1d is formed on the axis 1b. The base end of the outer peripheral surface of the rising portion 1c, which is formed in parallel and continues to the outer peripheral surface parallel to the axis 1b of the tip portion 1d, is inclined in a tapered shape so as to spread outward toward the root 1e side. The inclined surface is 1f. Then, by reducing the leading end side of the rising portion 1c having the inclined surface 1f and placing it on the base end side in the thickening step, the sagging portion 1g of the inner peripheral surface base end portion is reduced, or as eliminated, the axis circumferential surface parallel to 1b of the inner peripheral surface 1h, which extends proximally, thereby, the proximal portion 1i of the rising portion 1c, easily, and inexpensively be thickened The That is, in the rising portion molding step, the tip portion 1d of the rising portion 1c is extended in the direction of the axis 1b, and the outer peripheral surface of the tip portion 1d is formed parallel to the axis 1b, and the tip portion 1d, the outer peripheral surface proximal end of the rising portion 1c following the outer peripheral surface parallel to the shaft center 1b is an inclined surface 1f, and in the thickening process, the distal end side of the rising portion 1c is crushed and placed on the proximal end side. crowded at the inner by extending the parallel peripheral surface on the base end side in the axis 1b of the peripheral surface 1h, easy and a thickening been rising portion 1c which is parallel to the inner peripheral surface 1h the axis 1b It can be manufactured at low cost.

  Moreover, according to the manufacturing method of this thickening press product 2, since the base end part 1i of the rising part 1c is thickened, and the outer peripheral surface of the rising part 1c becomes the inclined surface 1f, it has extra meat. The rising portion 1c that is lightweight and highly rigid can be formed.

  In addition, this invention is not necessarily limited to embodiment mentioned above, A various other change is possible. For example, the thickened press product 2 may be any product as long as the rising portion 1c is thickened, not the clutch piston material.

  Further, the workpiece 1 may be made of another metal plate such as an aluminum alloy or a magnesium alloy, or may be made of a material other than the metal plate, without being made of a steel plate.

  Further, the workpiece 1 may not be a disc shape, but may be other shapes such as an elliptical plate shape, and even if it is not a flat plate shape, a convex portion or a concave portion is formed, curved or bent. You may do it.

  Moreover, although the hole 1j is opened in the workpiece 1, the hole 1j may not be provided. That is, in the rising portion forming step, the rising portion 1c may be formed by drawing instead of burring. And in this case, the bottom wall that closes the inside of the rising portion 1c with the tip may be cut between the rising portion forming step and the thickening step, or after the thickening step. The bottom wall may be left as it is without being cut.

  Further, after the production of the thickened press product 2, various post-processing such as cutting may be added to complete the product.

It is sectional drawing which shows the processing target object of one Embodiment of this invention. Similarly, it is a sectional view showing a rising portion forming step. Similarly, it is sectional drawing which shows a thickening process. It is sectional drawing which shows the thickening process by the conventional metal mold | die in steps.

DESCRIPTION OF SYMBOLS 1 Work object 1a Main body part 1b Axis center 1c Rising part 1d Tip part 1e Root 1f Inclined surface 1g Sag part 1h Inner peripheral surface 1i Base end part 1j Hole 1k Tip 101 One side 2 Thickening press product T Thickness W1 Rise Between the inner peripheral surface of the part and the base of the inclined surface W2 Distance between the inner peripheral surface of the rising part and the tip of the inclined surface

Claims (4)

For a plate-shaped workpiece, a rising portion that forms a cylindrical rising portion from the main body portion to one side in the axial direction facing the front and back of the main body portion on the inner side of the processing target object. A method for producing a thickened press product, comprising a forming step and a thickening step of increasing the thickness of the rising portion,
In the rising portion forming step, the rising portion is formed by burring or drawing, and at the time of forming, the tip portion of the rising portion is extended in the axial direction so that the outer peripheral surface of the tip portion is formed. Formed parallel to the shaft center, and the tip end portion of the outer peripheral surface base end portion of the rising portion that continues to the outer peripheral surface parallel to the shaft center is inclined in a tapered shape so as to spread outward toward the root side. Inclined surface,
In the thickness increasing step, the leading end side of the rising portion is crushed and installed on the proximal end side, and the sagging portion caused by the burring or throttling at the inner peripheral surface proximal end portion of the rising portion is reduced or eliminated. Thus, the manufacturing method of the thickening press product which thickens the base end part of the said rising part by extending the surrounding surface of the internal peripheral surface of the said rising part parallel to the said axial center to the base end side. In the manufacturing method of the thickening press product of Claim 1,
The object to be processed has a hole,
In the rising portion forming step, the rising portion is formed on the peripheral portion of the hole by the burring. In the manufacturing method of the thickening press product of Claim 2,
After the thickness increasing step, the interval between the inner peripheral surface of the rising portion and the base of the inclined surface is in the range of 1 to 1.8 times the plate thickness of the main body where the rising portion rises. Manufacturing method for press products. In the manufacturing method of the thickening press product of Claim 2 or 3,
After the thickening step, the distance between the inner peripheral surface of the rising portion and the tip of the inclined surface is in the range of 0.5 to 0.9 times the plate thickness of the main body portion where the rising portion rises. Manufacturing method for thickened press products.

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