JPS5935846A - Method and device for manufacturing ring-like parts - Google Patents

Abstract

PURPOSE:To manufacture ring-like parts having a good yield and high dimension precision of the inside circumferential face, by a utilizing extrusion and ironing instead of conventional machining, when manufacturing the ring-like parts having an outward flange on both ends. CONSTITUTION:First of all, a material to be worked such as steel, etc. is upsetted to a shape being similar to the outside circumference of desired ring-like parts. The material after upsetting is worked to ring-like parts having a flange part 4 whose one end part has a bottom part 2 and also which projects in the diameter expanding direction extending over the overall length round the circumference of the other end part 3. In this regard, the connecting part of the bottom part 2 and the ring part 5 is curved, and the bottom part 2 is made comparatively thin. Subsequently, the bottom part 2 is punched by leaving a projecting part 6 in the diameter contracting direction extending over the overall length in the circumferential direction. The formed projecting part 6 is ironed by applying a load so as to be deformed in the diameter expanding direction extending over the overall length in the circumferential direction, a flange part 8 is formed extending over the overall length in the circumferential direction, on the one end part 1, too, and ring-like parts being a final product are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a ring-shaped part having flanges protruding in the diametrical direction over the entire length in the circumferential direction, so-called outward 7 flange at both ends, and especially an ironing step when carrying out the method. The invention relates to devices used in

Conventionally, the above-mentioned ring-shaped parts have been manufactured by the procedure shown in FIG. In short, the material to be processed is swaged [Fig. 1 (a)], then extruded into a ring shape having a bottom 2 at one end 1 [Fig. 1 (b)], and then,
The bottom part 2 is punched out to obtain a ring-shaped part whose inner diameter and outer diameter are uniform in the axial direction [FIG. 1 (c)], and then both ends 1.3 of the ring-shaped part are punched. In order to form a flange, the outer circumferential surface other than the two end portions 1.3 is cut (see FIG. 1).

However, with this method, there is a lot of rice used as the punching material;
Moreover, there was a problem that the yield rate was poor due to large cutting allowances. Further, in addition to forming both ends into a flange shape, when the outer circumferential shape is made to be more complicated, the cutting process is time-consuming.

The present invention has been made in view of this point, and an object of the present invention is to provide a method for manufacturing the above-mentioned ring-shaped component with high yield. In order to achieve this object, the method of the present invention is characterized in that the ring-shaped part is manufactured by using extrusion and ironing instead of cutting. Along with this, the present inventors propose an apparatus to be used in the ironing process.

Embodiments of the present invention will be described based on the drawings.

FIG. 2(a) to 2) show the procedure of one embodiment, and should be understood in contrast to FIG. 1(a) to ←).

The first step is the swaging step, in which the material to be processed, such as steel, is processed into a cylindrical shape, that is, a shape similar to the outer peripheral shape of the ring-shaped part [Figure 2 (a)].

The second step is an extrusion step. [ Figure 2 (b)].

That is, in this extrusion process, parts other than one end 1 are processed into a product shape. Here, at the one end portion, an R is attached to the connecting portion between the bottom portion 2 and the ring portion 5,
The wall thickness in the bottom part 2 is made relatively thin. In this case, B
・This is to make the meat flow easily in the fourth step of the acupuncture process.

The third process is a punching process. Here, the bottom formed in the second step is punched out leaving a protrusion 6 that protrudes in the diameter reduction direction over the entire length in the circumferential direction [FIG. 2 (c)].

In addition, in the figure, 7 is a punched piece.

The fourth step is the laddering step. Here, in order to deform the protrusion 6 formed in the third step in the diametrical direction over the entire length in the dark direction, a load of 10 is applied in the same direction.
Iron it [Figure 2]. That is, in this ironing step, a flange portion 8 protruding in the diametrically expanding direction over the entire length of the Oifi portion 1 is formed, and a ring-shaped component as a final product is obtained.

The ironing device used in this process is shown in FIG. 3 together with the material to be strained, and the ironing device will be explained below. This device is mainly composed of a die and a cutting punch, and the die consists of a lower die 9 and a movable die 10 positioned above the lower die 9, and each die 9 and 10 are arranged coaxially to form a hole. It has portions 11 and 12, respectively. Then, the workpiece (that is, the ring-shaped component that has undergone the first to third steps) 13 is placed on the mounting portion 9a of the lower die 9 and set in the holes 11 and 12.

In this case, the work 13 and each die 9°10 are
3. On the outer periphery of the workpiece 13, a relief part 10a is formed in the movable die 10 at a position corresponding to one end 1 of the workpiece 13. do not have. That is, a relief portion 10a is provided when the shape of one end portion 1 of the workpiece 13 changes outward in the horizontal direction when the protrusion 6 is squeezed by the operation of the squeeze punch. The thickness of the relief portion 10a is made approximately the same as the size of the flange portion 8 to be formed. A knockout bin 14 located inside the lower die 9 and below the workpiece 13 is movable up and down, and is used to take out the workpiece 13 after ironing. The movable die 10 is horizontally movable, and the rod 15
is installed. Reference numeral 16 denotes a stopper, which is present on the outer periphery of each of the dies 9 and 10 to restrict horizontal movement of the movable die 10 during operation, and is movable up and down. Further, 17 is a reinforcement link. On the other hand,
The straining punch 18 has a straining portion 18a′ft at its tip, and the straining portion 18a is positioned coaxially with the workpiece 13 set in the hole portion 10.11 so that it can be freely inserted into and removed from the workpiece 13. . The aspects of the squeezing part 18a are as follows:
Its maximum diameter matches the inner diameter of the product. In this example,
The tip portion has a minimum diameter, the rear end portion has a maximum diameter, and is curved outward in the radial direction. f, 18b
At the bottom dead center of the ironing punch 18, the lower surface of the presser portion 18 matches the upper surface of the relief portion 10a, which restricts the deformation of the workpiece 13 from escaping toward the ground. The actual squeezing work is carried out as follows. That is, when the straining punch 18 moves up and down to insert and remove the workpiece 13, the straining portion 18a
Among them, the portion 1 of the workpiece 13 having a larger diameter than the inner diameter of the protrusion 6 is brought into contact with the inner circumferential surface of the protrusion 6, so that the so-called
Exhibits a strained state. As described in (1) above, in the part corresponding to the protrusion 6, the workpiece 1 in the vertical direction
3 is regulated and only the horizontally outward escape portion 10a is provided, so if the above-mentioned condition is continued for a predetermined period of time, a flange will also be formed at one end 11 of the workpiece 13. Become. Moreover, the squeezing part 18a
Since the maximum diameter of the ring portion 5 matches the inner diameter of the ring portion 5, the inner diameter of the ring-shaped component is the same at any position in the axial direction. In this way, the desired final product, a ring-shaped part, ie, a ring-shaped part having outward flanges at both ends, is obtained.

In the embodiment, an example was given in which the work 13 was positioned below the partial metal having the other end 3, that is, the flange 4, and set in the holes 11 and 12 of the die.
That is, the portion having the protrusion 6 may be positioned below.

Further, since the flange portion 8 is formed based on the deformation of the protrusion 6, the volume occupied by the protrusion 6 is the same, so the flange portion 8 has a larger diameter than the diameter of the protrusion 6. The protrusion length of the portion 8 is smaller than that of the protrusion 6, or the convergence thereof is smaller than the width of the protrusion 6 in the axial direction.

Therefore, in consideration of this point, it is preferable to set the amount of the protrusion 6 to be left in the third step and the bottom dead center of the ironing punch 18 in the fourth step.

Further, the present invention is also effective when forming convex portions 19 on the outer circumferential surface of a ring-shaped component other than at both ends thereof. That is, in the second step, a protrusion is formed on the inner circumferential surface corresponding to the outer circumferential surface on which the protrusion is to be formed,
If a die having a relief part at a position corresponding to the convex part 19 is used in the fourth step, a ring-shaped part that also has the convex part 19 can be obtained without relying on cutting. This can also be achieved by using a die having recesses corresponding to the projections 19 in the second extrusion step. FIG. 4 shows an example of a product obtained in this way.

According to the present invention, in the third step, the punching step,
Since the protrusions remain, the amount of punched material can be reduced, and since no cutting process is required and there is no cutting allowance, the yield is improved. Furthermore, when it is desired to manufacture a ring-shaped part having outward flanges at both ends as in the present invention, it is possible to perform extrusion processing to form a 7-flange at the other end in the extrusion process using the conventional method. In this case, it was necessary to subsequently integrate a separate flange-shaped member that should be present at one end.
According to the present invention, these problems are solved, so that the flange can be formed in the extrusion process.

Furthermore, the fourth step, which is the ironing step, also improves the dimensional accuracy of the inner circumferential surface of the -C,') ring-shaped component.

[Brief explanation of drawings]

Figure 1 is a diagram showing the procedure of the conventional method, Figure 2 is a diagram showing the procedure of the present invention method, Figure 3 is a diagram showing the ironing device used in the fourth step of the present invention method together with the workpiece, The figure does not show other examples of ring-shaped parts obtained by the method of the present invention. 1...One end part 9.10-...Die 2...Bottom part ioa...Escape part 3...Other end part
11, 12... Hole portion 4.8... Flange portion
18... Shigoki Punch 6... Protrusion
18a...-Stringing Department Patent Applicant Toyota Motor Corporation

Claims (2)

[Claims] (1) A method for manufacturing a ring-shaped part having outward flanges at both ends, including a first step of swaging the material to be processed, and forming the material after the first step into a ring shape having a bottom at one end, and , a second step of extruding the other end into a flange shape that protrudes in the diameter expanding direction over the entire length in the circumferential direction; a third step of punching, leaving a portion of the material remaining, and a fourth step of squeezing the protrusion of the material after the third step to deform it into a flange shape that protrudes in the diametrical direction over the entire length in the circumferential direction. 1S manufacturing method for ring-shaped parts characterized by: (2) A ring-shaped component is present, which has a protrusion at one end that protrudes in the diameter-reducing direction over the entire length in the circumferential direction, and a flange portion at the other end that protrudes in the diameter-expanding direction over the entire length in the circumferential direction. The ring-shaped part has a hole in which the protrusion of the ring-shaped part is held back to form a flange part that protrudes in the diametrical direction over the entire length in the dark rotation direction. The gouer is located on the same axis as the ring-shaped part held by the die and can be freely inserted into and removed from the ring-shaped part, and has a maximum diameter on the same plane as the inner diameter of the ring-shaped part. An ironing punch for a ring-shaped part, comprising: an ironing punch having an ironing part at its tip;