JP2523023B2 - Method for manufacturing sheet metal parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sheet metal part of a primary cylinder used in an automatic transmission of an automobile, a hydraulic fluid chamber forming member in a continuously variable transmission, a piston and other parts. Manufacturing method.

[Prior Art] Conventionally, a component such as a primary cylinder of this type is generally manufactured by die casting.

[Problems to be Solved by the Invention] When a relatively complicated component having a seal ring fitting groove on its outer peripheral surface is manufactured by die casting, such as a primary cylinder, it is large and complicated like a die casting machine. There is a problem that not only equipment is required, but also the manufacturing cost of the mold itself is high, which causes an increase in the cost of the product (part).

The present invention has been made in view of the above circumstances, using a circular steel plate as a raw material, a predetermined shape using a simple manufacturing equipment, a sheet metal part that can be produced at low cost with good productivity It is intended to provide a manufacturing method.

[Means for Solving the Problems] In order to achieve the above object, in the method for manufacturing a sheet-metal component according to the first aspect of the present invention, the components are fitted into each other with an annular space substantially corresponding to the thickness of the circular steel plate. The pair of mold devices including a pair of squeezing dies that have circular recesses and protrusions, and have outer surfaces of the recesses and protrusions that extend outward from the mold center line and that face each other in parallel. The step of drawing the central portion of the circular steel plate with the mold and forming a brim portion on the periphery thereof to form a cup-shaped body with a collar, and the plate thickness of each portion of the cup-shaped body with a collar are substantially equivalent to By having the concave portion and the convex portion of the pair of molds having the concave portion and the convex portion which are fitted to each other while maintaining the annular space, the concave portion and the convex portion of the pair of molds are fitted to each other, the brim portion of the cup-shaped body The edge of the pair of molds A step of bending to one side to form an annular bent piece, one mold having an annular recess into which the annular bent piece of the collar-shaped cup-shaped body is fitted, and a cup portion of the collar-shaped cup-shaped body Between the two molds of the mold device including the other mold having a horizontal surface that horizontally supports the convex portion and the collar portion that are fitted in the annular bending piece fitted in the annular concave portion of the one mold. In a state where the cup-shaped body with a collar is completely sandwiched in a state of being constrained in the laying direction and the center direction of the cup-shaped body with a cup, the cup-shaped body with a collar is rotated around the center line together with the mold device, And a step of pressing the annular convex portion of the rolling roller against the outer peripheral surface of the annular bent piece and biting the annular convex portion to form a seal ring fitting groove on the outer periphery of the collar portion.

Further, the method for manufacturing a sheet metal component according to the second aspect of the present invention has flat surfaces facing each other, and an annular gap substantially corresponding to the thickness of the circular steel plate is provided at a position corresponding to the peripheral edge of the circular steel plate. A step of bending the peripheral edge portion of the circular steel plate to one side of the pair of molds by a mold device composed of a pair of molds so as to be fitted to each other to form an annular bent piece; Between the two dies of a mold device having a pair of dies having annular recesses into which the annular folds of the circular steel plate are fitted, and the annular fold of one of the dies. While completely sandwiching the circular steel plate in a state of being fitted in the annular recess and constrained in the axial direction and the central direction of the circular steel plate, in a state in which the circular steel plate is rotated around its center line together with the die device, On the outer peripheral surface of the annular bending piece, attach the annular protrusion of the rolling roller. Discipline, and by bite into those with and forming a seal ring fitting groove on the outer periphery of the circular steel plate.

[Operation] According to the first and second inventions, a circular steel plate is used as a raw material, and a circular steel plate as the raw material is pressed by a pair of molds in a mold device and pressed, and a peripheral surface of the raw material is pressed. On the other hand, it is possible to manufacture a component having a predetermined shape by all the cold working means of rolling, which presses the rolling roller. As a result, compared to the conventional die casting, the manufacturing equipment is simpler, and the pair of molds in the mold device may be simple in shape, which can reduce the mold manufacturing cost, the primer cylinder, etc. It is possible to reduce the manufacturing cost of these parts. Further, since it is formed by rolling the cup-shaped body with the groove for fitting the seal ring or the thick portion formed on the peripheral portion of the circular steel plate, the workability can be improved and the strength and accuracy are excellent. A groove is obtained.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 (I) to (VI) relate to claim 1 of the present invention,
It is a first embodiment showing a manufacturing process of a so-called cup type primary cylinder. Since each process is symmetrical, only the right half is shown.

FIG. 1 (I) shows a state where a circular steel plate A having a predetermined diameter D as a material is obtained by press working. The first to fifth mold devices 1, 2, 3, 4, and 5, which are sequentially used for forming the circular steel plate A, the pressure rollers 7, 8, and the rolling roller 9 are configured as follows.

That is, the first mold device 1 shown in FIG. 1 (II) is for squeezing work and comprises upper molds 20A, 20B and a lower mold 21. Upper mold 20A
Is cylindrical, and the lower part thereof is formed into a tapered surface 23 that is inclined downward from the mold center line 22 toward the outside. Further, the upper mold 20B has a function of a pressing mold, and is arranged inside the upper mold 20A. The lower die 21 has a convex portion 24 having a circular cross-section that can be fitted into the upper die 20A while maintaining an annular distance substantially corresponding to the thickness of the circular steel plate A, and the lower portion of the outer periphery of the convex portion 24 causes the upper die 20A to have the above-mentioned shape. The taper surface 23 is provided in parallel with the taper surface 23.

The second mold device 2 shown in FIG. 1 (III) has a rotation center line 26 extending in the vertical direction. The second mold device 2 is formed with a convex part 27 and a tapered surface 28 that are substantially the same size and shape as the convex part 24 and the tapered surface 25 of the first mold device 1.
One of the pressure rollers 7 attached to the second mold device 2 is cone-shaped, and the length of the pressure roller 7 extending from the central portion of the convex portion 27 to the outer peripheral portion is such that the large path side thereof is the outer peripheral portion side of the convex portion 27. so,
It is arranged at one place on the convex portion 27 so as to be vertically movable. The lower portion 29 of the roller pressing surface is held in parallel with the upper surface 30 of the convex portion, so that the rotation center line 31 of the pressing roller 7 is inclined by that amount. The other pressure roller 8 attached to the second mold device 2 has a rotation center line 32 extending in the vertical direction, and is arranged on one side of the second mold device 2 so as to be movable in the horizontal direction. There is. The pressure roller 8 has a pressure surface 34 parallel to the peripheral surface 33 of the convex portion 27 and a pressure surface 35 parallel to the tapered surface 28.

The third mold device 3 shown in FIG. 1 (IV) comprises upper molds 36A and 36B and a lower mold 37. The upper die 36A has a cylindrical shape, and the upper die 36B arranged therein has a function of a pressing die. Lower mold 3
7 is provided with a convex portion 39 which can be fitted into the upper mold 36A with an annular space substantially corresponding to the thickness of the circular steel plate A being maintained. The height and diameter of the convex portion 39 are substantially the same as those of the convex portion 27 shown in (III).
A horizontal surface 41 is formed via a tapered surface 40 that has substantially the same inclination as that of the tapered surface 28 and has a shorter length than the tapered surface 28. Further, a taper surface 42 and a horizontal surface 43 facing in parallel to the taper surface 40 and the horizontal surface 41 of the lower mold 37 are formed on the lower peripheral portion of the upper mold 36A.

The fourth mold device 4 shown in FIG. 1 (V) is composed of an upper mold 10 and a lower mold.
It consists of 11A and 11B. The lower mold 11A is provided with a projection 12, a tapered surface 13 and a horizontal surface 14 which are substantially the same as those of the lower mold 37 shown in (IV), and the lower mold 11B is formed between the upper mold 10 and the thickness of the material steel plate. It is fitted to the outer peripheral portion of the lower mold 11A with an annular gap G substantially corresponding to the above. Further, the upper mold 10, the convex portion 12,
The pressing surface 15 is provided along the tapered surface 13 and the horizontal surface 14.

The fifth mold device 5 shown in FIG. 1 (VI-1) is composed of an upper mold 44 and a lower mold 45, and has a rotation center line 46 extending in the vertical direction. The lower mold 45 is provided with a convex portion 47, a tapered surface 48 and a horizontal surface 49 which are substantially the same as those of the lower mold 37 shown in (IV). Further, the upper mold 44 is provided with a pressing surface 50 along the convex portion 47, the tapered surface 48 and the horizontal surface 49, and an annular recess 51 formed around the rotation center line 46 on the outer peripheral portion of the pressing surface 50. There is. The rolling roller 9 attached to the fifth mold device 5 has a rotation center line 52 extending in the vertical direction,
It is arranged on one side of the so as to be horizontally movable.
On the outer periphery of the rolling roller 9, in a state where the fifth die device 5 is closed as shown in the drawing, an annular convex portion 53 that can be fitted from the outer side of the annular concave portion 51 between the upper and lower metallic molds with a certain vertical gap. Are formed, and annular restriction surfaces 54, 54 are formed above and below the base of the annular convex portion 53.

Next, a method of manufacturing a so-called cup-shaped primary cylinder with the above configuration will be described.

First, the circular steel plate A shown in FIG. 1 (I) is shown in FIG. 1 (II).
Is set concentrically on the lower mold 21 of the first mold device 1 shown in FIG. 1, and then the upper mold 20 is driven downward to undergo drawing. That is, in this step, the central portion of the circular steel sheet A is narrowed down into the upper die 20 by the convex portion 24 of the lower die 21, and the peripheral edge portion of the circular steel sheet A is tapered by the tapered surface 23 of the upper die 20A. A so-called brim-shaped cup-like body 64 is formed, which is pressed against the surface 25 and thus has a cup portion 62 at the center and a brim portion 63 projecting obliquely downward at the periphery thereof.

Cup-shaped body 64 with a collar formed as described above
Is then transferred to the second mold device 2 as shown in FIG. 1 (III), the cup portion 62 is fitted on the convex portion 27, and the stoop portion 63 is supported on the tapered surface 28. . The pressure roller 7 is pressed against the upper surface of the cup portion 62, the pressure surface 34 of the other pressure roller 8 is pressed against the outer peripheral surface of the cup portion 63, and the pressure surface 35 is pressed against the surface of the flange portion 63 excluding the peripheral edge portion 61. In this state, the second mold device 2 is rotationally driven together with the flanged cup-shaped body 64 at their common center line 26. At the time of this rotation, one pressure roller 7 remains in the initial pressed state against the upper surface of the cup portion 62 of the cup-shaped body 64 with a collar, and while exerting the action of shaping the cup portion 62, The other pressure roller 8 repeatedly applies a load to the collar portion 63 of the collared cup-shaped body 64 excluding the peripheral edge portion 61, whereby the surface of the collar portion 63 is work-hardened to form a collared portion. The hardness of the cup-shaped body 64 is slightly improved.

The cup-shaped body 64 with a collar having improved shaping and surface hardness as described above is then formed into the third shape shown in FIG. 1 (IV).
It can be transferred to the mold device 3. In this step, the upper die 36 is driven downward with the cup portion 62 of the cup-shaped body 64 with a collar fitted in the convex portion 39 of the lower die 37, so that the outer peripheral side of the collar portion 63 is lowered. It is pressed against the horizontal surface 41 of the mold 37 and bent horizontally.

Thereafter, the cup-shaped body 64 with the collar is transferred to the fourth mold device 4 shown in FIG. 1 (V). Here, the cup portion 62 of the flanged cup-shaped body 64 is fitted to the convex portion 12 of the lower mold 11A, and the stirrup portion 63 is supported by the tapered surface 13 and the horizontal surface 14 to hold the pressing surface 15 of the upper mold 10. As a result, the cup-shaped body 64 with a collar is fixed. At this time, the peripheral edge portion 61 of the collar portion 63 projects on the outer periphery of the lower mold 11A. Next, lower mold
By driving 11B upward, the peripheral portion 61 is bent upward at a right angle to form an annular bent piece.

The cup-shaped body 64 with a collar which has undergone the above steps is finally transferred to the fifth mold device 5 shown in FIG. 1 (VI-1). In this step, first, the convex portion 47 of the lower mold 45 is fitted with the cup portion 62 of the cup-shaped body 64 with a collar, and the annular concave portion of the upper mold 44 is fitted.
The peripheral portion of the brim portion 63, that is, the annular bending piece 61 is set in the 51,
When the cup-shaped body 64 with a collar is completely sandwiched between the upper and lower molds 44, 45, the fifth mold unit 5 is a cup-shaped body with a collar.
The rolling roller 9 is rotationally driven together with 64 on the common center line 46, and the rolling roller 9 is horizontally driven in the direction of arrow E so that the annular convex portion 53 is pressed against the outer peripheral surface including the annular bending piece 61 of the collar portion 63. Then, the rolling roller 9 rotates (follows). At this time, the annular bending piece 61 is accommodated in the annular recess 51 and is restrained in the axial direction and the central direction of the cup-shaped body 64 with a collar, and as shown in FIG. 1 (VI-2), When the rolling roller 9 is further driven by a predetermined amount in the direction of arrow E, the peripheral edge portion 61 of the collar portion 63 has an annular recess 51 and a horizontal surface 49.
The ring-shaped convex portion 53 of the rolling roller 9 bites into the peripheral edge portion 61 of the seal roller, and as a result, the seal ring fitting groove 65 is formed on the outer periphery of the collar portion 63. Further, at that time, both side walls of the seal ring fitting groove 65, that is, the rim portion (see FIG. 2 (I)) are formed by the upper and lower annular restriction surfaces 54, 54 of the annular convex portion 53.
The outer diameter d of 66 is regulated.

Since the peripheral portion 61 of the collar portion 63 is not subjected to the hardening treatment shown in FIG. 1 (III), the bending work shown in FIG. 1 (V) and the rolling work shown in FIG. 1 (VI-2) can be easily performed. Be seen.

FIG. 2 (I) is an enlarged view of the seal ring fitting groove 65 formed as described above. Although the groove 65 has a rectangular cross section, it can be formed in a hemispherical shape as shown in FIG. 2 (II), for example. Also, FIG. 2 (I)
Although the rim portion 66 shown in FIG. 1 is offset to one side of the collar portion 63, it may be formed so as to project symmetrically on both sides of the collar portion as shown in FIG. 2 (III).

3 (I) to (VI) relate to claim 2 of the present invention,
It is an embodiment showing a manufacturing process of a so-called disk type primary cylinder.

The process of FIG. 3 (I) is the same as that described in FIG. 1 (I). First mold device 70 shown in FIG. 3 (II)
Has a lower die 72 having a rotation center line 71 extending in the vertical direction, and a material receiving surface 73 made of a flat horizontal surface is formed on the upper surface of the lower die 72. The pressure roller 7 described in FIG. 1 (III) is provided below the upper mold 74 of the first mold device 70.

The second mold device 80 shown in FIG. 3 (III) is composed of an upper mold 81 and lower molds 82A, 82B, and the upper mold 81 and the lower mold 82A face each other at their flat surfaces 83, 84, and The die 82B maintains an annular gap G between the upper die 81 and the upper die 81, which corresponds to the thickness of the material steel plate, and
It is fitted around the outer circumference of 82A.

A third mold device 90 shown in FIG. 3 (IV-1) is composed of an upper mold 93 and a lower mold 94 which are opposed to each other at their flat surfaces 91, 92,
It has a rotation center line 95 extending in the vertical direction. Here, the annular recess 51 described with reference to FIG. 1 (VI-1) is formed in the lower portion on the outer peripheral side of the upper die 93, and the side portion of the third mold device 90 is provided with the annular recess 51 shown in FIG. The rolling roller 9 described in 1) is arranged.

On the other hand, a punching device 75 is shown in FIG.
The punching device 75 has a punching hole 77 at the center of the material support base 76, and a punch 78 that can be fitted into the punching hole 77 from above is arranged, and the material pressing member is provided on the outer periphery of the punch 78. 79
Is provided.

Further, FIG. 3 (VI) shows the burring device 81. The burring device 81 includes a material support base 82 and a material presser 83 arranged above the material support base 82.
A burring rod 84 that is driven in the vertical direction is arranged in the central portion of the.

Next, a method of manufacturing a so-called disk-type primary cylinder with the above configuration will be described.

First, as shown in FIG. 3 (II), the circular steel plate A as a material shown in FIG. 3 (I) is concentrically set on the lower mold 72 of the first mold device 70, and then the upper mold. By driving the mold 74 downward, the pressure roller 7 is pressed onto the surface of the circular steel plate A from the center side to the vicinity of the peripheral edge.

Thereafter, the lower mold 72 of the first mold device 70 is rotationally driven together with the circular steel plate A at their common center line 71. As a result, the pressure roller 7 rotates (follows), and the repeated load of the pressure roller 7 is applied to almost the entire surface of the circular steel plate A except for the peripheral edge portion 61, whereby the peripheral edge portion 61 of the circular steel plate A is removed. The hardness of the surface of the part is improved.

Thereafter, the circular steel plate A is transferred to the third mold device 80 shown in FIG. 3 (III). Here, the circular steel plate A is held between the upper die 81 and the lower die 82A concentrically with them. At this time, the peripheral edge portion 61 of the circular steel plate A projects on the outer periphery of the lower mold 82A. Then, by driving the lower mold 82B upward, the peripheral edge portion 61 is bent upward at a right angle to form an annular bent piece.

After the above steps, as shown in FIG. 3 (IV-1), the circular steel plate A is concentrically held between the upper die 93 and the lower die 94 of the third die 90, and the annular bending piece 61 is housed in the annular recess 51. Then, the third mold device 90 is rotationally driven together with the circular steel plate A at the common center line 95, and the rolling roller 9 is horizontally driven in the direction of the arrow E so that the annular convex portion 53 of the circular steel plate A is annular. It is pressed against the outer peripheral surface including the bent piece 61, and the rolling roller 9 rotates (follows). At this time, the annular bending piece
61 is accommodated in the annular recess 51 and is restrained in the axial direction (vertical direction) and center direction of the circular steel plate A, and as shown in FIG. 3 (IV-2), the rolling roller 9 has an arrow mark. When the circular steel plate A is further driven by a predetermined amount in the E direction, the peripheral edge portion 61 of the circular steel plate A is pressed between the annular recess 51 and the flat surface 92,
The annular convex portion 53 of the rolling roller 9 bites into the peripheral edge portion 61, and as a result, a seal ring fitting groove 65 is formed on the outer periphery of the circular steel plate A. At that time, the seal ring fitting groove 65 is formed by the annular restricting surfaces 54, 54 located above and below the annular convex portion 53.
Outer diameter d of both side walls of the rim, that is, the rim portion (see FIG. 2 (I))
Is regulated.

The circular steel plate A subjected to the above processing is then set on the support base 76 of the punching device 75 shown in FIG.
Fixed by 79. Then, by lowering the punch 78,
The central portion of the circular steel plate A is punched out to form the shaft hole 85.

The circular perforated plate A that has undergone the above steps is finally shown in FIG. 3 (VI).
Is sent to the burring device 81 shown in FIG. After that, the rod 84 is driven to rise, so that the periphery of the shaft hole 85 is pushed up, so that a predetermined disk-shaped primary cylinder having the boss portion 86 in the central portion is formed.

Since the peripheral portion 61 of the collar portion 63 is not subjected to the hardening treatment of FIG. 3 (II), the bending work of FIG. 3 (III) and the rolling work of FIG. 3 (IV-2) are easy. To be done.

[Effects of the Invention] Since the present invention is configured as described above, the following effects are achieved.

According to the first and second aspects of the invention, a circular steel plate is used as a raw material, and the circular steel plate as the raw material is clamped by a pair of molds in a mold device to press it. Since the parts having a predetermined shape can be manufactured by all the cold working means of the rolling process of pressing the rolling roller against the outer peripheral surface of the material, the manufacturing facility is simpler than that of the conventional die casting. At the same time, the pair of molds in the mold device may be simple in shape, the mold manufacturing cost can be reduced, and the manufacturing cost of parts such as the primary cylinder can be reduced. In particular, since it is formed by rolling the cup-shaped body with the groove for fitting the seal ring or the thick portion formed on the peripheral portion of the circular steel plate, it is possible to improve the workability and to improve the strength and accuracy. Also, excellent grooves can be obtained, and the sealing performance can be secured when the parts are used.

In addition, it is easy to press the pressure roller on the surface of the cup-shaped body with a collar or the circular steel plate before forming the groove for fitting the seal ring on the peripheral portion thereof. Since the diameter can be increased, sufficient strength can be imparted to both cup-shaped and disk-shaped components even if the thickness of the circular steel sheet used as the material is thin.

[Brief description of drawings]

1 (I) to (VI-2) are a first embodiment showing a manufacturing process of a primary cylinder according to claim 1, and FIG. 2 (I).
3 to (III) are enlarged views of the seal ring fitting groove portion, and FIGS. 3 (I) to (VI) are embodiments showing the manufacturing process of the primary cylinder according to claim 2. A …… Circular steel plate 1,2,3,4,70 …… Molding device 7,8 …… Pressing roller 9 …… Rolling roller 26,46,71,95 …… Center line 51 …… Annular recess 61 …… Annular bent piece 62 …… Cup portion 63 …… Collar portion 64 …… Cup-shaped body with collar 65 …… Seal ring fitting groove

Claims (2)

(57) [Claims] 1. A circular recess and a protrusion are fitted into each other while maintaining an annular distance substantially corresponding to the thickness of the circular steel plate, and the recess and the protrusion extend outward from the center line of the mold on the outer periphery of the recess and the protrusion. , A central portion of the circular steel plate is drawn by the pair of molds of a mold device having a pair of squeezing dies having surfaces facing each other in parallel, and a collar portion is formed on the peripheral edge of the circular steel sheet, and a collar is formed. A step of forming into a cup-shaped body, and a mold device including a pair of molds having a concave portion and a convex portion that are fitted into each other with an annular interval substantially corresponding to the plate thickness of each portion of the cup-shaped body with flanges A step of bending the peripheral edge portion of the flange portion of the cup-shaped body to one side of the pair of molds by fitting the concave portion and the convex portion of the pair of molds into each other to form an annular bent piece; An annular bend of the cup-shaped body with the brim Between the two molds of the mold device comprising one mold having an annular recess into which is fitted and the other mold having a horizontal surface for horizontally supporting the convex part and the flange part fitted into the cup portion of the cup-shaped body with a collar. , The annular bending piece is fitted in the annular recess of one mold and is constrained in the axial direction and the central direction of the cup-shaped body with the collar, and the cup-shaped body with the collar is completely sandwiched, and While the cup-shaped body with a collar is rotated around the center line together with the mold device, the annular projection of the rolling roller is pressed against the outer peripheral surface of the annular bent piece, and the seal ring is applied to the outer periphery of the collar portion. And a step of forming a fitting groove. 2. It has flat surfaces opposed to each other, and is fitted to each other at a location corresponding to the peripheral edge of a circular steel sheet with an annular gap substantially corresponding to the thickness of the circular steel sheet being maintained. A step of bending the peripheral edge portion of the circular steel plate to one side of the pair of molds by a mold device composed of a pair of molds to form an annular bent piece, and the annular bent piece of the circular steel plate is fitted. Between the two molds of a mold device having a pair of molds having annular recesses and facing each other, the annular bending piece is fitted in the annular recess of one mold, and the shaft of the circular steel plate is inserted. The circular steel plate is completely sandwiched in a state of being constrained in the longitudinal direction and the central direction, and then the circular steel plate is rotated around its center line together with the die device, and the rolling roller is formed on the outer peripheral surface of the annular bending piece. By pressing the annular convex part of Method for producing a sheet metal part, characterized in that a step of forming an outer peripheral seal ring fitting groove of a circular steel plate.