JPH06226394A - Method and device for thick forming of annular body - Google Patents

Abstract

PURPOSE:To provide a method and device, for thick forming of annular body, which is capable of forming an annular body whose thickness is thick and especially whose outer and inner circumferential surfaces are smooth. CONSTITUTION:On the inner circumference of a hole 11A in a die 11, a tapered surface 11B is formed which is gradually smaller in diameter along the approaching direction A of a punch 12 against the die 11; and on the outer circumference of the tip end 12A of the punch 12, a tapered surface 12B is formed which is gradually smaller in diameter along the approaching direction A of the punch 12 against the die 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for thickening the thickness of an annular body such as a washer.

[0002]

2. Description of the Related Art Conventionally, for example, a washer W which is serrated and fitted to a serration portion 1A of a suspension mount bolt 1 of an automobile as shown in FIG. 10 has been stamped and formed from a thick steel plate.

The suspension mount bolt 1 is for mounting the sub-claim 2 on the axle side at a fixed position of the vehicle body 4 via the elastic body 3, a nut 5 is screwed to the tip thereof, and the outer peripheral edge portion of the washer W is attached. Is welded to the car body 4.

[0004]

By the way, since the above-mentioned conventional washer W is stamped and formed from a thick plate, each of the inner peripheral surface and the outer peripheral surface of the washer has a sheared surface with less unevenness peculiar to the punched molding. A rough fracture surface with unevenness is generated. That is, with respect to the thick plate between the die for punching and the punch, first, the edge portion of the punch that shear-forms the inner peripheral surface of the washer W bites into the front surface side of the thick plate, and A die for shearing the outer peripheral surface bites into the back side of the thick plate. After that, the thick plate is gradually sheared as the punch descends, and cracks grow at the inner peripheral surface of the washer W on the rear surface side of the thick plate and the outer peripheral surface of the washer on the front surface side of the thick plate. As a result, they are fractured, resulting in a severely uneven fracture surface. Further, each of the inner peripheral surface portion (shear surface) on the front surface side of the washer W and the outer peripheral surface portion (shear surface) on the rear surface side of the washer W is drooped by pulling when the punch and the die bite. Occurs.

When, for example, the serration portion 1A of the suspension mount bolt 1 described above is fitted to the inner peripheral surface of the washer W, the portion of the inner peripheral surface (shear) on the surface side of the washer W is substantially Since there is a possibility that only the surface) will be fitted by serration, it is necessary to position the portion (shear surface) of the inner peripheral surface on the front surface side of the washer W in the upper part of FIG. 10 in order to obtain the fitting strength. . On the other hand, when the edge portion of the outer peripheral surface of the washer W is welded to the vehicle body 4, in order to improve the aimability of the welding torch, the portion (shear section) of the outer peripheral surface on the back surface side of the washer W is shown in FIG.
It must be located in the lower part of the inside. Thus, the directionality is required for the washer W to be assembled, and the worker must confirm the direction every time the assembly is performed, and the workability of the assembly is poor.

Further, due to sagging on the inner peripheral surface on the front surface side of the washer W and the outer peripheral surface on the rear surface side, contact failure between the washer W and the head of the bolt 1 and the washer W and the vehicle body 4 are caused. There is a problem that poor contact and welding defects are likely to occur.

An object of the present invention is to solve the above-mentioned conventional problems, and to increase the thickness of an annular body, and particularly to form an annular body having a thick outer peripheral surface and an inner peripheral surface. To provide a device.

[0008]

In the thickening and forming method for an annular body according to the first aspect of the present invention, at least a part of the inner diameter of the hole portion of the die or the outer diameter of the tip portion of the punch is the above-mentioned. It is set to be gradually smaller along the approaching direction of the punch with respect to the die, the annular body to be molded having a hole in the center is fitted into the hole portion of the die, and the tip of the punch is located at the center of the annular body. After being fitted into the hole, the punch is moved in the direction close to the die to press and move the annular body in the hole of the die, whereby the inner peripheral surface of the hole of the die and the punch. The outer peripheral surface of the tip portion is compressed between the outer peripheral surface and the inner peripheral surface of the annular body to increase the thickness.

In the thickening and forming method for an annular body according to the second aspect of the present invention, the inner diameter of the hole portion of the die is the same along the axial direction thereof, and at least a part of the outer diameter of the tip portion of the punch is used. , Is gradually set smaller along the approaching direction of the punch with respect to the die, and an annular body to be molded having a hole in the center is supported on the lower mold in the hole of the die, and the tip of the punch is After fitting into the hole in the center of the annular body, the punch is moved in the direction close to the die to press and move the tip end portion of the punch into the hole of the annular body. The outer peripheral surface and the inner peripheral surface of the annular body are compressed by the inner peripheral surface of the portion and the outer peripheral surface of the tip portion of the punch to increase the thickness.

In the thickening and molding apparatus for a ring-shaped body according to the first embodiment of the present invention, a die having a hole portion into which the ring-shaped body to be molded can be fitted and a tip portion can be fitted into the hole portion of the ring-shaped body. A punch is provided so as to be relatively movable toward and away from each other, and at least a part of the inner diameter of the hole portion of the die or the outer diameter of the tip portion of the punch is arranged along the approach direction of the punch with respect to the die. The feature is that it is set to be gradually smaller.

In the thickening and shaping apparatus for a ring-shaped body according to the second aspect of the present invention, a die having a hole portion into which the ring-shaped body to be molded can be fitted and a tip portion can be fitted into the hole portion of the ring-shaped body. A punch and a punch are provided so as to be relatively movable toward and away from each other, the inner diameter of the hole portion of the die is made the same diameter along the axial direction thereof, and at least a part of the outer diameter of the tip portion of the punch is set to the die. It is characterized in that a lower die for supporting the annular body is provided in the hole of the die, the lower die being set to be gradually smaller along the approaching direction of the punch.

[0012]

According to the present invention, at least one of the inner diameter of the die and the outer diameter of the punch is set to be gradually smaller along the approach direction of the punch to the die, and the annular body is pressure-molded by using the die and the punch. The annular body is formed while increasing its thickness, and in particular, the outer peripheral surface and the inner peripheral surface thereof are smoothly formed. As a result, it is possible to form an annular body having a large wall thickness and high dimensional accuracy from a thin annular body material.

[0013]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 to FIG. 3 are views for explaining the first embodiment of the present invention.

In FIG. 1, 11 is a die fixed at a fixed position, 12 is a punch attached to a retainer 13 which can move up and down, and the punch 12 is in the direction of arrow A (die 11
By lowering the punch 12 in the direction close to the punch 12), the annular washer material W ₀ is thickly formed in the hole 11A of the die 11 as described later. The washer material W ₀ is stamped and formed from a steel plate.

On the inner peripheral surface of the hole portion 11A of the die 11, the tapered surface 1 in which the inner diameter D ₁ -1 gradually decreases from the upper side to the lower side in the range of the substantially upper half thereof.
1B is formed, and a straight surface 11C having the same inner diameter D _1-2 is formed in a range of a substantially lower half thereof. On the other hand, the tip portion 12A of the punch 12 have been a small diameter, on the outer peripheral surface of the lower side of the distal end portion 12A, the tapered surface 12B of the outer diameter D ₂ -1 becomes gradually smaller as direction from top to bottom forming Has been done. Also, the tapered surface 12
The outer peripheral surface on the upper side of B is a straight surface 1 having the same outer diameter D ₂ -2.
It has become 2C, further enlarged diameter portion 12D whose diameter increases to the outer diameter D ₃ is provided on its upper side.

Inner diameter D _{1 at the} upper end of the hole 11A of the die 11
1 is larger than the outer diameter of the washer material W _0, also the outer diameter D ₂ -1 protrusions 12A the lower end of the punch 12 is a washer material W
It is set smaller than the center hole W ₀ -A of the inner diameter of _0. In addition, the inner diameter D _{1-2 of the} die 11 and the punch 12
The outer diameter D ₂ -2 of the front end portion 12A is set to a size corresponding to the outer diameter and the inner diameter of the washer material W ₀ after thickening. Further, each of the outer diameter D ₃ of the punch 12 and the outer diameter of the lower mold 14, which will be described later, is set to a size that fits into the straight surface 11C of the die 11. Also,
Reference numeral 14 is a pipe-shaped lower die which is vertically movable in the die 11, and 15 is a rod for moving the lower die 14 up and down.

In forming the washer material W ₀ , however, as shown in FIG. 1, the washer material W ₀ is fitted into the hole 11A of the die 11 and then the punch 12 is lowered to move the tip end thereof. The lower end of 12A is fitted into the hole W ₀ -A of the washer material W ₀ .

Thereafter, the punch 12 is further lowered, and the lower die 14 is accordingly lowered to press-form the washer material W ₀ as shown in FIGS. 2 and 3. That is, the outer peripheral surface of the washer material W ₀ is
While it is forcedly passed through the tapered surface 11B of the die 11, it is gradually pressed in the diameter reducing direction, and the inner peripheral surface of the washer material W ₀ has a taper of the tip portion 12A of the punch 12 therein. While the surface 12B is forcibly passing through, the pressure is gradually applied in the radial direction. These results, so that the wall thickness H ₀ of the washer material W ₀ is gradually thickened. Then, at the final stage shown in FIG. 3, the outer peripheral surface of the washer material W ₀ is fitted into the straight surface 11C of the die 11,
Further, the straight surface 12C of the tip portion 12A of the punch 12 is fitted into the inner peripheral surface thereof, and the washer material W ₀ is pressed between the lower die 14 and the expanded diameter portion 12D of the punch 12 to increase the wall thickness. The washer W _{1 of} H ₁ is completed. The lower mold 14 is
The range of movement is regulated so that the position shown in FIG. 3 is the limit position for downward movement. Washer W ₁ after molding
Is discharged upward by the upward return of the punch 12 and the lower mold 14.

By the way, since the washer W ₁ is formed while being thickened by the pressure applied from both the outer peripheral surface and the inner peripheral surface, the outer peripheral surface and the inner peripheral surface are made smooth, and the washer is also formed. The dimensional accuracy of W ₁ will be improved. Also, washers W ₁
Since it is molded and processed, it can be molded with a low distortion by a comparatively small processing force.

These results, for example, the washer W ₁
Is used as the washer W of FIG. 10 described above,
The entire smooth inner peripheral surface of the washer W ₁ is securely serrated with the serration portion 1A of the suspension bolt 1 so that the coupling strength between them is significantly increased, and the washer W is attached to the head of the bolt 1 and the vehicle body 4. Also, the washer W and the vehicle body 4 can be reliably welded by making sure surface contact with each other. Further, the washer W ₁ has no direction in assembling, and the assembling workability is improved. in addition,
For shaping the washer W ₁ thick from the washer material W ₀ thin, can be inexpensively molded washer W ₁ of a predetermined thickness by effectively utilizing the steel thin scraps. For example, a washer material W _{0 having} a plate thickness of 8 mm could be formed into a washer W ₁ having a plate thickness of 10 mm.

FIG. 4 is a diagram for explaining the second embodiment of the present invention.

In the case of this embodiment, the tip portion 12 of the punch 12 is
A is a straight surface 12E of the slightly smaller same outer diameter D ₂ -3 than the inner diameter of the hole W ₀ -A washer material W _0. The lower end of the tip portion 12A is a tapered surface for guiding when the protrusion 12A is fitted into the hole W ₀ -A of the washer material W ₀ . Then, the washer material W
_As shown in FIG. 4, ₀ is lowered while being pressed by the step portion 12D of the punch 12, and when the outer peripheral surface of the washer material W ₀ is forcibly passed through the tapered surface 11B of the die 11. The outer peripheral surface is gradually pressed in the radial direction. At this time, the inner peripheral surface of the washer material W ₀ is deformed by reducing its diameter, but the diameter reduction is suppressed to a predetermined value or less by the straight surface 12E of the punch 12, and as a result, the washer material W ₀ is thickened. It will be. Thus, in the case of this example, the washer material W ₀ is centripetally pressed from the outer peripheral surface side thereof.

FIG. 5 is a diagram for explaining the third embodiment of the present invention.

In the case of this embodiment, the hole 11A of the die 11 is used.
The inner peripheral surface of, and is a straight surface 11D of slightly larger outer diameter D ₁ -3 than the outer diameter of the washer material W _0. Therefore, when the tapered surface 12B of the punch 12 the washer material W ₀ of the hole W ₀ within -A by lowering the punch 12 is forcibly passed through the inner peripheral surface thereof is pressurized in diameter direction, when the The diameter-expanded deformation of the outer peripheral surface of the washer material W ₀ caused by the straight surface 11D of the die 11 is suppressed below a predetermined value. As a result, the washer material W ₀ is thickened. Thus, in the case of this example, the washer material W ₀ is centrifugally pressed from its inner peripheral surface side.

6 and 7 are views for explaining the fourth embodiment of the present invention. In this embodiment, a round chamfered mold portion 12F is provided on the step portion 12D of the punch 12 in the embodiment of FIG. 4 described above. Therefore, when the washer material W ₀ is thickened, a part of the increased thickness escapes into the mold portion 12F, and the washer W ₂ having a particularly thick outer peripheral edge portion as shown in FIG. Can be manufactured.

8 and 9 are views for explaining the fifth embodiment of the present invention. In this embodiment, a round chamfered mold portion 14A is provided on the inner peripheral edge of the lower mold 14 in the embodiment shown in FIG. Therefore, when the washer material W ₀ is thickly formed, a part of the increased thickness escapes to the mold portion 14A, and a washer W ₃ having a particularly thick inner lower peripheral edge portion as shown in FIG. 9 is formed. Can be manufactured.

According to the present invention, it is possible to increase the thickness of various deformed washers having various plane shapes or various annular bodies other than the washer according to the shapes of the die 11 and the punch 12. Further, the material of the annular body can be thick-formed into various shapes, and for example, the annular material can be thick-formed into a rectangular frame-shaped annular body. Further, the annular body after the thickening molding may be pushed out below the die 11 and discharged.

Further, when the inner peripheral surface of the hole portion 11A of the die 11 is the straight surface 11D as in the embodiments of FIGS. 5 and 8 described above, the washer material W ₀ is prevented from falling. Although the lower die 14 for supporting is required, when the tapered surface 11B is formed on the inner peripheral surface of the hole portion 11A of the die 11 as in the embodiment of FIGS. 1 to 3, 4 and 6, It is not necessary to prevent the washer material W ₀ from falling by the lower mold 14. Therefore, in the case of the latter embodiment, the lower mold 14 is not particularly required unless the lower surface of the washer material W ₀ is required to be molded. When the lower die 14 is provided, the lower die 14 is fixed at a fixed position in the hole 11A of the die 11 in any of the embodiments. In this case, the lower die 14 is fixed at a position where it comes into pressure contact with the lower surface of the washer material W ₀ when the punch 12 is at the lower limit position, that is, when the thickening forming of the washer material W ₀ is completed.

The tapered surfaces 11B and 12B are
Hole 11A of die 11 and tip 12 of punch 12
It may be formed on at least part of A.

[0031]

As described above, according to the present invention, at least one of the inner diameter of the die and the outer diameter of the punch is set to be gradually smaller along the approaching direction of the punch with respect to the die,
Since the annular body is pressure-molded by using the die and the punch, the annular body can be molded while increasing its thickness, and in particular, the outer peripheral surface and the inner peripheral surface thereof can be smoothly molded. As a result,
An annular body having a large wall thickness and high dimensional accuracy can be formed from a thin annular body material.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of essential parts of a device according to a first embodiment of the present invention at an initial stage of a molding operation.

FIG. 2 is a vertical cross-sectional view of a main part of the device shown in FIG. 1 in the middle of the molding operation stage.

FIG. 3 is a vertical cross-sectional view of the main parts of the apparatus shown in FIG. 1 at the end of the molding operation stage.

FIG. 4 is a vertical cross-sectional view of a main part showing a device according to a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of an essential part showing a device according to a third embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a main part showing a device according to a fourth embodiment of the present invention.

7 is a cross-sectional view of a washer manufactured by the apparatus of FIG.

FIG. 8 is a vertical cross-sectional view of a main part showing a device according to a fifth embodiment of the present invention.

9 is a cross-sectional view of a washer manufactured by the apparatus of FIG.

FIG. 10 is an explanatory diagram of a washer provided on a suspension mount bolt of an automobile.

[Explanation of symbols]

11 Die 11A Hole 11B Tapered Surface 11C Straight Surface 12 Punch 12A Tip 12B Tapered Surface 12C Straight Surface 12D Step 13 Retainer 14 Lower Die 15 Rod W ₀ Washer Material W _0- A Hole W ₁ Washer

Claims (4)

[Claims] 1. At least a part of the inner diameter of the hole of the die or the outer diameter of the tip of the punch is set to be gradually smaller along the approaching direction of the punch with respect to the die, and the hole is formed at the center. The annular body to be molded having is fitted into the hole of the die, and the tip of the punch is fitted into the hole in the center of the annular body, and then the punch is moved in the direction close to the die. By pressing and moving the annular body in the hole portion of the die, the inner peripheral surface of the hole portion of the die and the outer peripheral surface of the tip portion of the punch between the outer peripheral surface and the inner peripheral surface of the annular body. A method for increasing the thickness of an annular body, characterized by compressing a space to perform an increase in thickness. 2. The inner diameter of the hole of the die is made the same along the axial direction thereof, and at least a part of the outer diameter of the tip of the punch is gradually reduced along the approaching direction of the punch with respect to the die. It is set, the annular body to be molded having a hole in the center is supported on the lower mold in the hole of the die, and the tip of the punch is fitted into the hole in the center of the annular body, By moving the punch in the direction close to the die to press and move the tip of the punch into the hole of the annular body, the inner peripheral surface of the hole of the die and the outer peripheral surface of the tip of the punch. A method for increasing the thickness of an annular body, comprising compressing between an outer peripheral surface and an inner peripheral surface of the annular body to increase the thickness. 3. A die having a hole into which an annular body to be molded can be fitted, and a punch whose tip can be fitted into the hole of the annular body are provided so as to be relatively movable toward and away from each other. At least a part of the inner diameter of the hole portion of the die or the outer diameter of the tip portion of the punch is set to be gradually smaller along the approaching direction of the punch with respect to the die. Thick molding equipment. 4. A die having a hole portion into which a ring-shaped body to be molded can be fitted, and a punch whose tip portion can fit into the hole portion of the ring-shaped member are provided so as to be relatively movable toward and away from each other. The inner diameter of the hole portion of the die is made the same diameter along the axial direction thereof, and at least a part of the outer diameter of the tip portion of the punch is set to be gradually smaller along the approach direction of the punch with respect to the die, An apparatus for thickening and molding a ring-shaped body, comprising a lower die for supporting the ring-shaped body inside the hole of the.