JPH07110387B2 - Method for forming groove for fitting seal ring from cup-shaped body with steel plate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for forming a seal ring fitting groove from a flanged cup-shaped body made of a steel plate, and a component obtained by the method is, for example, a primary cylinder. used.

[Prior Art] Conventionally, a component of a primary cylinder having a groove for fitting a seal ring of this type has generally been manufactured by die casting.

[Problems to be Solved by the Invention] According to the die casting, the thickness of the member becomes thick to obtain a predetermined strength, and the equipment becomes complicated.
There was a problem that increased the cost.

The present invention has been made in view of such circumstances, and a cup-shaped body with a collar made of a steel plate is prepared, and a seal ring fitting groove can be formed from the cup-shaped body with a collar, and the manufacturing is performed. The purpose is to simplify the equipment, obtain a sufficient strength with a thin wall, and consequently reduce the cost.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention fixes a cup-shaped body with a collar made of a steel plate between upper and lower molds of a mold device, and further fixes the collar together with the mold device. Forming a seal ring fitting groove on the outer periphery of the collar portion by pressing and biting the annular convex portion of the rolling roller onto the outer peripheral surface of the collar portion in a state in which the attached cup-shaped body is rotated about its center line. Is characterized by.

[Operation] According to the present invention, a cup-shaped body with a collar made of a steel plate is prepared, and as a result of processing the cup-shaped body, it is possible to obtain sufficient strength even if the material is thin. .

Further, since the flange portion of the flanged cup-shaped body is formed by rolling to form the seal ring fitting groove, the manufacturing equipment is simplified and the cost is reduced.

Further, since the seal ring fitting groove is formed by rolling, workability and groove strength are improved.

[Example] FIGS. 1 (I) to (IV) show an example of forming a cup-shaped body 64 with a collar from a circular steel plate A, and FIG. 1 (V-1).
(V-2) shows a manufacturing process of the embodiment of the present invention in which the seal ring fitting groove 65 is formed from the flanged cup-shaped body 64 made of a steel plate. Since each process is symmetrical, only the right half is shown.

FIG. 1 (I) shows a state in which a circular steel plate A having a predetermined diameter D is obtained by press working as a raw material. First to fourth mold devices sequentially used for forming the circular steel plate A
1,2,3, and 4, and processing rollers 7,8, rolling roller 9
Is configured as follows.

That is, the first mold device 1 shown in FIG. 1 (II) is for squeezing processing and includes upper molds 20A and 20B and a lower mold 21. Upper mold 20A
Has a cylindrical shape, and the lower portion 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. In the second mold device 2,
Almost the same size as the convex portion 24 and the tapered surface 25 of the first mold device 1
A convex portion 27 and a tapered surface 28 having the same shape are formed. Second
One of the pressure rollers 7 attached to the mold apparatus 2 is cone-shaped and has a length from the center of the convex portion 27 to the outer peripheral portion such that its large diameter side is the outer peripheral side of the convex portion 27. , Convex 27
It is arranged in one position on the top so that it can move vertically. 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 left-right direction. There is. The pressure roller 8 includes 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.
Are formed.

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 37
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), and the lower peripheral portion of the convex portion 39 has substantially the same inclination as the tapered surface 28 shown in (III). A horizontal surface 41 is formed via a tapered surface 40 having a length shorter than that of the tapered surface 28. Further, a taper surface 42 and a horizontal surface 43 that face parallel to the taper surface 40 and the horizontal surface 41 of the lower mold 37 are formed on the lower outer periphery of the upper mold 36.

The fourth mold device 4 shown in FIG. 1 (V-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 fourth mold device 4 has a rotation center line 52 extending in the vertical direction, and is arranged at one side portion of the fourth mold device 5 so as to be horizontally movable. ing. On the outer periphery of the rolling roller 9, with the fourth mold device 4 closed as shown in the drawing, an annular convex portion 53 which can be fitted from the outside of the annular concave portion 51 between the upper and lower metallic molds with a certain vertical gap. Is formed,
Moreover, annular restriction surfaces 54, 54 are formed above and below the base of the annular convex portion 53.

Next, a method of forming the cup-shaped body 64 with a collar from the circular steel plate A and then forming the seal ring fitting groove 65 in the collar portion 63 from the cup-shaped body 64 with a collar will be described with the above configuration.

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 molds 20A and 20B are 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 dies 20A and 20B by the convex portion 24 of the lower die 21, and the peripheral edge portion of the circular steel sheet A is lowered by the tapered surface 23 of the upper die 20A. Is pressed against the taper surface 25 of
As a result, a so-called flanged cup-shaped body 64 is formed in which the cup portion 62 is located at the center and the brim portion 63 that projects obliquely downward is located on 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 62, 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. During this rotation, the pressure roller 7 has a cup-shaped body 64 with a collar.
While exerting the effect of shaping the cup portion 62 of the, the pressure roller 8 work hardens the surface of the collar portion 63 of the cup-shaped body 64 with a collar except the peripheral portion 61, so that the hardness of the cup-shaped body 64 with a collar is increased. improves.

The brim-shaped cup-shaped body 64 whose shaping and surface hardness have been improved as described above is then transferred to the third mold device 3 shown in FIG. 1 (IV). In this step, by driving the upper mold 36 downward while the cup portion 62 of the cup-shaped body 64 with a collar is fitted to the convex portion 39 of the lower mold 37,
The outer peripheral side of the brim portion 63 is pressed against the horizontal surface 41 of the lower mold 37 and bent horizontally.

The cup-shaped body 64 with a collar which has undergone the above steps is finally transferred to the fourth mold device 4 shown in FIG. 1 (V-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.
51 The lower edge of the brim 63 fits into the peripheral edge 61, and the upper and lower molds 44, 4
In a state where the collared cup-shaped body 64 is completely sandwiched and fixed between the five, the fourth mold device 4 is rotationally driven together with the collared cup-shaped body 64 at the common center line 46, and the rolling roller is 9 is horizontally driven in the direction of arrow E, and its annular projection
53 is pressed against the outer peripheral surface of the thick portion 61 of the collar portion 63, and the rolling roller 9 rotates. At this time, the peripheral portion of the brim portion 63
61 is in a state of being completely fixed in the mold with a constant gap in the axial direction of the cup-shaped body 64 with a collar (vertical direction), that is, maintaining the depth of the annular recess 51 in the figure, Moreover, the first
As shown in FIG. (V-2), the rolling roller 9 is further driven by a predetermined amount in the direction of the arrow E, so that the peripheral edge portion 61 spreads in the vertical direction between the annular recess 51 and the horizontal surface 49 and becomes constant. It becomes wider and the annular convex portion 53 of the rolling roller 9 bites into the wide portion, and the seal ring fitting groove is formed on the outer periphery of the collar portion 63
65 is formed. At that time, the outer shape d of both side walls of the seal ring fitting groove 65, that is, the rim portion {see FIG. 2 (I)} 66 is restricted by the upper and lower annular restriction surfaces 54, 54 of the annular convex portion 53.

Since the peripheral edge portion 61 of the collar portion 63 is not subjected to the surface hardening treatment of FIG. 1 (III), the molding of the seal ring fitting groove 65 is easily performed.

FIG. 2 (I) is an enlarged view of the seal ring (O-ring) fitting groove 65 formed as described above. Such groove 65
Although has a rectangular cross section, it can be formed in a hemispherical shape as shown in FIG. 2 (II), for example. Although the rim portion 66 shown in FIG. 2 (I) is offset to one side of the collar portion 63, for example, as shown in FIG. 2 (III), the collar portion 6 is formed.
It may be formed so as to project symmetrically on both sides of 6.

Further, the manufactured parts described in the above embodiments are used, for example, as constituent parts of a primary cylinder.

[Effects of the Invention] As described above, according to the present invention, a cup-shaped body with a collar made of a steel plate is prepared, and the cup-shaped body is processed. As a result, the thickness of the plate is thinner than that produced by die casting. Even if it has sufficient strength, it can be provided.

Further, according to the present invention, since the brim portion of the cup-shaped body with a collar made of a steel plate is formed by the rolling forming, the manufacturing equipment can be simplified and the cost can be reduced.

Further, since the seal ring fitting groove is formed by rolling, it is possible to improve workability and groove strength.

[Brief description of drawings]

1 (I) to (V-2) are views of an embodiment showing the manufacturing process of the present invention, and FIGS. 2 (I) to (III) are enlarged views of the seal ring fitting groove portion. A …… Circular steel plate 4 …… Mold device 9 …… Rolling roller 44 …… Upper mold (upper mold) 45 …… Lower mold (lower mold) 46 …… Center line 62 …… Cup part 63 …… Collar part 64 …… Cup-shaped body with a collar 65 …… Seal ring fitting groove

Claims (1)

[Claims] 1. A plate-like cup-shaped body made of a steel plate is clamped and fixed between upper and lower molds of a mold apparatus, and the cup-shaped body with flanges is rotated together with the mold apparatus about its center line. A ring-shaped cup-shaped body made of a steel plate, characterized in that a ring for fitting a seal ring is formed on the outer periphery of the collar portion by pressing and biting the annular protrusion of the rolling roller against the outer peripheral surface of the collar portion. A method of forming a combined groove.