JPH0152094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a triple-folded annular flange plate with boss portions by pressing.

A flange plate, such as a ring gear flange plate used in a gear transmission of an automatic transmission, is rotatably mounted on the inner circumference by a bearing. Since it forms a contact surface with a constant width, it has a relatively large thick boss. Conventionally, flange plates with relatively large thick bosses were manufactured by cutting, but productivity The disadvantages were that the weight of the parts was low and the weight of the parts was large.

In order to eliminate the above drawbacks, we performed burring on the inner circumferential side of the annular flat plate, and then performed triple-fold press processing to form a triple-fold thick boss part to meet the purpose of use as described above. By manufacturing an annular flange plate with a thick-walled boss, it is possible to improve productivity and significantly reduce costs, as well as reduce the weight of the parts. It is quite difficult to manufacture a product with a predetermined uniform wall thickness and a predetermined radial width, and when done using the conventional manufacturing process as shown in Figures 1 to 8, a triple layer as shown in Figure 9 Folding part tip 101
Partial shrinkage of the meat, boss part tip 10 in Figure 10
Defects were likely to occur, such as the number 2 becoming blank and the tip 103 of the boss portion shown in FIG. 11 becoming thick. Figure 1 is blanking, Figure 2 is the first drawing process, Figure 3 is the center piercing process, Figure 4 is the second drawing process, Figure 5 is the burring process, Figure 6 is the first buckling process, 7th
The figure shows a cross-sectional view of the workpiece at the end of the tip drawing process, and FIG. 8 shows a cross-sectional view of the workpiece at the end of the second buckling process.

In order to improve the above-mentioned drawbacks, the present invention has been developed by blanking a sheet metal, repeatedly drawing the center part to protrude roundly on a curved surface, and punching a center pierce, and then burring the sheet metal to form a predetermined shape and shape on the inside. A step of forming an annular sheet metal having a cylindrical protrusion of uniform length and cross-sectional outer diameter, the annular sheet metal having a continuous portion from the outer flat plate part to the inner cylindrical protrusion in the direction from the flat plate direction to the cylindrical protrusion direction. It is formed in an arcuate cross-section that gradually curves, and is further formed in an arcuate cross-section that gradually curves in the same direction at the middle part of the cylindrical protrusion, and is curved in a direction perpendicular to the flat plate part, and continues to the middle part. It is formed in a cross-sectional arc shape that gradually curves in the opposite direction (inward direction) at the tip, and the tip is narrowed to form a bending margin. The sheet metal is pressed to form a cylindrical space having a radial width equivalent to the radial width at the end of machining of the triple-fold boss portion formed by slidingly fitting a die and a punch. 3, which is installed at a predetermined position in a buckling press die that operates to compress the space in the axial direction, so that the inner cylindrical protrusion part has a predetermined wall thickness and radial width in one buckling process.
Compared to the annular flange plate with thick boss part manufactured by conventional cutting process, the process consists of forming a double-folded boss part, and improves productivity, significantly reduces cost, and reduces weight. It is possible to form the triple-fold boss part of the annular flange plate with a thick triple-fold boss part manufactured by press processing to a uniform wall thickness and radial width dimension with relatively high precision. Partial shrinkage of the meat at the tip of the folded part 3
The purpose of the present invention is to provide a method for manufacturing a triple-folded boss-shaped flange plate that can prevent defects such as uneven wall thickness at the tip of the double-folded boss and reduce the number of press processing steps. shall be.

The manufacturing method of the triple-fold boss-backed flange plate of the present invention includes blanking a sheet metal, performing multiple drawing processes to make the central part protrude roundly on a curved surface, and center pierce punching, and then burring the sheet metal. constructing to form an annular sheet metal having a cylindrical protrusion of a predetermined and uniform length and cross-sectional shape on the inside;
The annular sheet metal has an arcuate cross section that gradually curves from the flat plate direction to the cylindrical protrusion direction in a continuous portion from the outer flat plate part to the inner cylindrical protrusion part, and further curves gradually in the same direction at the middle part of the cylindrical protrusion part. The cross section is formed into an arc shape that is curved in the direction perpendicular to the flat plate part, and the cross section is formed in an arc shape that gradually curves in the opposite direction, that is, the inner direction at the distal end part that continues to the intermediate part, and the distal end becomes narrow. The cylindrical protruding portion-shaped sheet metal that has undergone the burring process is then press-formed by slidingly fitting a die and a punch. At a predetermined position of a buckling press mold that operates to form a cylindrical space having a radial width equivalent to the radial width of the boss portion when processing is completed, and to compress the cylindrical space in the axial direction. and forming the inner cylindrical protrusion into a triple-folded boss having a predetermined wall thickness and radial width by one buckling process.

Next, the present invention will be explained based on embodiments shown in the drawings.

Figures 12 to 17 show changes in the shape of the workpiece (workpiece) during the process of repeatedly pressing the sheet metal to form the annular flange plate 6 with a triple-folded boss portion, and the cross section of the workpiece at the end of each process. It is shown in the figure.

(1) A disk (first workpiece) 1 shown in FIG. 12 is formed by blanking a sheet metal into a disk shape using a press. Next, (2) the first workpiece 1 is
By drawing, the second workpiece 2 shown in FIG. 13 is formed in the shape of a truncated cone in which the continuum of each constituent surface is formed by a curved surface, with the center protruding broadly. Next, (3) the second workpiece is further subjected to a second drawing process, and the circular protrusion in the center is formed into a protrusion so that it becomes deeper and narrower.
A third workpiece 3 in the shape of a wide-brimmed hat shown in the figure is formed.
Next, (4) a center pierce punching process is performed in which the center of the flat end portion of the circular protrusion of the third workpiece 3 is punched into a circular shape of a predetermined diameter to form the fourth workpiece 4 shown in FIG. 15. Next, (5) the fourth workpiece 4 is placed in a burring press mold 70 shown in a cross-sectional view in FIG.
The circular protrusion 42 provided with the
From the outer flat plate part 51 shown in FIG. 6, the inner cylindrical protrusion 5
2 is formed in an arcuate cross-section that gradually curves from the flat plate direction to the cylindrical protrusion direction, and is further formed in an arcuate cross-section that gradually curves in the same direction at the intermediate portion 54 of the cylindrical protrusion 52. A fifth workpiece, which is curved in a direction perpendicular to the flat plate part 51, and has an arc-shaped cross section that gradually curves inward, which is the opposite direction, at a distal end 55 that is continuous with the intermediate part 54, and a distal end 56 narrows to form a bending margin. 5 is formed. Next, (6) the fifth workpiece 5 has a radial width equivalent to the radial width A at the end of machining of the triple-fold boss portion 61 formed by the die 81 and the punch 82 being slidably fitted together. While forming a cylindrical space 83, the cylindrical space 8
3 is installed in a buckling press die 80 that operates to compress it in the axial direction, and is buckled by the operations shown in FIGS. 18 to 22, resulting in the 6
A workpiece (ie, an annular flange plate with a triple-folded boss portion) 6 is formed.

Dimensions of each part of the sixth workpiece 6 and their mutual relationship in the case of this embodiment, and the fifth workpiece 5 before buckling processing
The relationship between the dimensions of each part is expressed by equations and inequalities based on the symbols of the dimensions shown in FIGS. 23 and 24.

D>X ₁ >F E>X ₂ A+B+C=Triple folded portion 3t>G D is the diameter of the starting point where the fifth workpiece 5 starts to curve from the outer flat plate portion 51 to the inner cylindrical protrusion 52;
X ₁ is the diameter of the triple-fold boss portion 61 of the sixth work 6;
X ₂ is the diameter of the center hole 62, G is its wall thickness,
t is the wall thickness dimension of the outer flat plate portion 63, A is the length of the tip portion 55 of the fifth work 5, B is the length of the intermediate portion 54,
C is the length of the portion 53, and A, B, and C each have the dimensions shown in the figure in the sixth workpiece 6 after buckling. F is the maximum outer diameter of the tip 55, E is the tip 5
It is the maximum inner diameter of 5.

Triple fold boss portion 6 of the sixth workpiece 6 after buckling processing
Key points of the shape of the fifth workpiece 5 so that the wall thickness G of 1 can be formed with high precision and uniformity, and the radial width A can also be formed with high precision 1) The shape and height of the cylindrical protrusion 52 are uniform. , 2) Tip portion 5 of cylindrical protrusion 52
4) the curvature and length of the curve of 5 are within an appropriate range; 3) the portion 53 continuous from the flat plate portion 51 to the cylindrical protrusion 52 is formed into a curved surface (the curvature is not important); ) Inside the mold at the tip 56 of the cylindrical protrusion at the start of buckling process (inside the cylindrical space 83)
That's all, the location of is appropriate.

In the above embodiment, a workpiece 5B having a shape in which a cylindrical portion 57B extending straight in the vertical direction is further formed on the tip 56 of the cylindrical protruding portion 52 of the fifth workpiece 5 at the end of the burring process is formed by burring process, as shown in FIG. - A four-fold buckling press die 90 that compresses the cylindrical protrusion 52B of the work 5B in the axial direction as shown in FIG. It is also possible to form

As described above, the manufacturing method of the annular flange plate with a triple-fold boss portion of the present invention involves blanking a sheet metal, performing multiple drawing processes to make the central portion protrude roundly on a curved surface, and center pierce punching, and then burring. performing processing to form an annular sheet metal having a cylindrical protrusion with a predetermined and uniform length and cross-sectional shape on the inside;
The annular sheet metal has an arcuate cross section that gradually curves from the flat plate direction to the cylindrical protrusion direction in a continuous portion from the outer flat plate part to the inner cylindrical protrusion part, and further curves gradually in the same direction at the middle part of the cylindrical protrusion part. The cross section is formed into an arc shape that is curved in the direction perpendicular to the flat plate part, and the cross section is formed in an arc shape that gradually curves in the opposite direction, that is, the inner direction at the distal end part that continues to the intermediate part, and the distal end becomes narrow. A triple-fold boss is formed by folding the annular sheet metal with a cylindrical protrusion after the burring process and press-forming the annular sheet metal with a cylindrical protrusion after the burring process by slidingly fitting the die and punch. A cylindrical space having a radial width equivalent to the radial width at the end of processing of the part is formed, and is installed at a predetermined position in a press die for buckling that operates to compress the cylindrical space in the axial direction. and forming the inner cylindrical protrusion into a triple-folded boss portion having a predetermined wall thickness and radial width by one buckling process, which is a process for forming the inner cylindrical protrusion into a triple-fold boss part having a predetermined wall thickness and radial width. A thick triple-fold bossed annular flange plate manufactured by press processing that can improve productivity, significantly reduce costs, and reduce weight compared to thick bossed annular flange plates. It is possible to form the triple-folded boss part with relatively high precision to uniform wall thickness and radial width dimensions, and it is possible to form the triple-folded boss part with uniform wall thickness and radial width dimensions. This has the effect that it is possible to prevent defects such as non-uniformity of the material and to reduce the number of press working steps.

[Brief explanation of drawings]

Figures 1 to 8 are process diagrams of a conventional method for manufacturing an annular flange plate with a triple-fold boss portion, and Figures 9 to 11 are half-sectional views showing defective products produced by the conventional manufacturing method.
12 to 17 are process diagrams of the method for manufacturing an annular flange plate with a triple-fold boss portion according to the present invention;
Fig. 22 is an explanatory diagram of the operation of the triple-fold buckling process, Fig. 23 is a cross-sectional view of the burring press die used in the process, Fig. 24 is a cross-sectional view of the annular flange plate with the triple-fold boss portion, 25 to 27 are explanatory diagrams of the operation of the four-fold buckling process of the annular flange plate with the four-fold boss portion. In the figure, 5...5th workpiece, 51...Outer flat plate part, 52
... Inner cylindrical protrusion, 53... Portion continuous from the outer flat plate part to the inner cylindrical protrusion, 54... Intermediate part, 55...
Tip part, 56... Tip.

Claims (1)

[Claims] 1 A sheet metal is blanked out, drawn several times to make the central part protrude round with a curved surface, and a center pierce punched out, and then burred to form a cylinder with a predetermined and uniform length and cross-sectional shape on the inside. a step of forming an annular sheet metal having a shaped protrusion, the annular sheet metal having a continuous section from the outer flat plate portion to the inner cylindrical protrusion portion gradually curving from the flat plate direction to the cylindrical protrusion direction; The cylindrical protrusion has an arcuate cross section that gradually curves in the same direction at the middle part, and is curved in a direction perpendicular to the flat plate part, and gradually inwardly in the opposite direction at the distal end part continuous to the middle part. The cylindrical protruding annular sheet metal is formed into an arcuate shape with a narrowed tip to form a bending allowance.Then, the die and punch can slide on the annular sheet metal with the cylindrical protrusion that has been subjected to the burring process. It forms a cylindrical space having a radial width equivalent to the radial width at the end of machining of the triple-fold boss portion that is fitted and press-formed, and operates to compress the cylindrical space in the axial direction. and forming the inner cylindrical protrusion into a triple-folded boss portion having a predetermined wall thickness and radial width by one buckling process. A method for manufacturing an annular flange plate with a triple-fold boss portion, characterized in that the wall thickness and radial width of the triple-fold boss portion can be ensured with high precision by one buckling process.