JP5040485B2 - Disc forging manufacturing equipment - Google Patents

Description

The present invention relates to a manufacturing apparatus for disc-shaped forging.

  Conventionally, what is called rotary forging is known as a method for manufacturing a disk-shaped forged product. In order to perform rotary forging, a cylindrical billet is first placed between the upper and lower anvils for upsetting forging and formed into a low-profile column by upsetting forging. The forged product is manufactured by subjecting the forged product to peripheral forging. Next, the forging is placed between the upper and lower anvils for rotary forging, and is rotated using a small upper anvil placed above the periphery of the forging while intermittently rotating around the central axis. Forging is performed while sequentially pressing the forging in the circumferential direction. And after forging the whole periphery of a to-be-forged material, the unforged part of the center axis vicinity is pressed. Further, if necessary, the upper and lower surfaces of the forged product are reversed and the back surface is similarly pressed and forged to produce a disk-shaped forged product.

  According to this rotary forging method, the forging is repeatedly pressed and forged while intermittently rotating the forging, so that a forging having a relatively large outer diameter can be forged even with a small-capacity manufacturing apparatus. The disk-shaped forged product has few dead zones that are not trained.

Further, in Patent Document 1, the surface of a forged object is pressed / forged using a jig having unevenness, and then the forged object is pressed / forged with an upper flat anvil. A method for producing a disk-shaped forging is disclosed. According to this method, the forging time can be shortened.
JP 2001-340938 A

  However, in the above-described method using rotary forging, the number of times of pressing is necessary and it takes a long time to manufacture, and at the time of forging, the to-be-forged object is repeatedly pressed while gradually shifting a part of the periphery in the circumferential direction. Since the forging is continued, the internal strain is not evenly given on one side and the other side around the central axis of the forged product, and it is difficult to form a uniform composition of the material. There was a problem.

  Further, in the method by forging in Patent Document 1, the material in the vicinity of the central axis of the forged object is not easily given a relief direction when pressed, the material does not easily flow inside, is not easily distorted, and has unevenness. There is a time difference between the forging of the tool and the forging of the upper flat anvil, and there is a problem that it is difficult to uniformly apply the strain due to the temperature difference caused by the time difference and it is difficult to form the material composition uniformly. was there.

The present invention has been made in consideration of such circumstances, and can produce a disc-shaped forged product that can uniformly strain the entire forged product and can uniformly form the composition of the material . An object is to provide a manufacturing apparatus.

In order to achieve the above object, the present invention proposes the following means. That is, the present invention provides a disk-shaped forging by arranging a column-shaped forged object between a lower anvil and an upper anvil and forging while relatively intermittently rotating the forged object and the upper anvil. The upper anvil has a plurality of pressing surfaces that extend in a radial direction perpendicular to the central axis through the central axis of the lower anvil, and the plurality of pressing surfaces are separated from the central axis. together are radially arranged, consists of three or four pressing surface extending radially from said central axis, the angle formed between the pressing surfaces of the respective centering on the central axis, equally characterized in that it is.

According to the manufacturing apparatus for a disk-shaped forged product according to the present invention, the forged product is pressed and forged with an upper anvil having a plurality of pressing surfaces extending in a radial direction perpendicular to the central axis of the lower anvil. Therefore, this upper anvil can press well the vicinity of the central axis of the forged product. Therefore, the material in the vicinity of the central axis of the to-be-forged product is easily plastically flowed by pressing, and is easily strained. Further, the plurality of pressing surfaces are arranged to extend in one direction and the other side in the radial direction orthogonal to the central axis, and forging while simultaneously pressing a plurality of workpieces at the same time. The to-be-forged object is made to give the distortion equally to the whole. Therefore, the composition of the material of the disc-shaped forged product to be manufactured can be formed uniformly.
In addition, since the area for pressing the forged object with the upper anvil is less than that for pressing the entire forged object, a forged object having a relatively large outer diameter can be obtained even with a manufacturing apparatus with a small capacity. It becomes possible to forge. Further, by forming the pressing surface into a flat shape, there is no need for a correction or forging process for processing the surface of the manufactured disk-shaped forged product again after this forging, and the equipment cost for finishing Can be reduced and the production efficiency can be improved.
In addition, if the shape of the upper anvil is formed as small as possible in accordance with the shape of the pressing surface, the manufacturing cost and the equipment cost of the upper anvil can be reduced.
When four of the plurality of pressing surfaces are provided at equal angles radially around the central axis, the pressing surfaces against which the forged object is pressed at a time are, for example , two in the opposite direction 180 ° from the central axis. Since it is arranged in a wider range as compared with the case where the two pressing surfaces are arranged, the whole can be evenly distorted with a small number of times. Therefore, the composition of the material of the disc-shaped forged product to be manufactured can be formed uniformly, and the number of pressings is reduced, so that the time required for forging can be reduced.

  In addition, when three of the plurality of pressing surfaces are provided radially at an equal angle with the central axis as the center, four pressing surfaces are provided at an equal angle radially with the two pressing surfaces arranged in the opposite direction of 180 °. Since forging having characteristics intermediate to those obtained can be performed, forging corresponding to various applications can be performed by variously selecting these upper anvils.

Moreover, the manufacturing apparatus of the disc-shaped forged product of the present invention may be configured such that the width of the pressing surface near the central axis is narrower than the width of the end portion on the radially outer side of the pressing surface. According to this, when the upper anvil presses the forged article, the vicinity of the central axis of the forged article is likely to be given the direction of escape of the material when pressed and compressed, and the plastic flow tends to occur. Therefore, distortion is given well. In addition, since the ratio of the pressed area of the surface of the forged object is approximated as a whole between the central side in the radial direction and the outer side, the disk-shaped forging that is more evenly distorted and manufactured. The composition of the material of the product can be formed uniformly.

According to the manufacturing apparatus of the disc-shaped forging according to the present invention, it is possible to provide a strain evenly across the object forging, can be uniformly formed the composition of the material.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are longitudinal sectional views showing the main part of a disc-shaped forged product manufacturing apparatus according to an embodiment of the present invention and a reference example , and FIG. 3 shows the main part of the disc-shaped forged product manufacturing apparatus of the reference example . plan view of FIG. 4, FIG. 5 is a plan view showing an upper insole according to one embodiment of the present invention.

  In order to manufacture the disk-shaped forged product according to the present invention, first, a columnar billet is placed between upper and lower anvils for upsetting forging, and upsetting forging is performed as necessary. The outer peripheral forging is performed to produce a forged article W having a low height. And as shown in FIG. 1, this to-be-forged material W is mounted in the upper surface of the disk-shaped lower anvil 1 supported by the manufacturing apparatus for rotary forging.

  As shown in FIG. 1, the lower anvil 1 has a mortar-shaped inclined surface whose surface has a flat bottom in the vicinity of the center and which gradually inclines upward as it goes radially outward from the bottom. A shallow concave shape is formed so as to smoothly connect the bottom portion to the inclined surface. And the to-be-forged object W is mounted so that the center may come on the central axis O of this lower anvil.

Further, an upper anvil 2 is disposed above the forged object W. The upper anvil 2 has a rectangular bar shape, and its longitudinal direction extends in a direction perpendicular to the central axis O of the lower anvil 1 and is supported by the manufacturing apparatus. The upper anvil 2 of the reference example shown in FIG. 3 is formed of two pressing surfaces 2a that are continuous with the surface to be forged W. These pressing surfaces 2a are centered on the central axis O. Side and 180 ° opposite to each other. These pressing surfaces 2a are formed symmetrically with respect to the central axis O.
4 and 5, the upper anvil 2 according to the present embodiment is arranged such that a plurality of pressing surfaces 2 a are radially arranged around the central axis O at an equal angle so as to be Y-shaped or X-shaped. .

As shown in FIG. 1, these pressing surfaces 2 a are formed by a plane perpendicular to the central axis O from the vicinity of the central axis O to the vicinity of the end portion. It is formed of a plane that gradually inclines downward toward the part. And each plane is formed so that it may connect smoothly.
Moreover, as shown in FIG. 1, the shape of the longitudinal section is formed symmetrically with the shape on the surface side of the longitudinal section of the lower anvil 1. In addition, the upper anvil 2 can be intermittently rotated about the central axis O, can be reciprocated linearly in the direction of the central axis O, and can be moved close to and away from the forged object W.

  Further, as shown in FIG. 3, the upper anvil 2 is provided with side surfaces 2 b formed on a plane parallel to the central axis O on both sides in the short direction, with the upper anvil 2 sandwiched therebetween. The width dimension formed between the side surfaces 2b facing each other is narrow in the vicinity of the central axis O, and gradually increases toward the end in the longitudinal direction.

  Then, while the upper anvil 2 is intermittently rotated about the central axis O, the pressing surface 2a is moved toward and away from the forged object W, pressed, and forged. As the order of pressing, for example, as shown in FIG. 3, first, the forging W is pressed by the upper anvil 2 (solid line) arranged with the left-right direction in the drawing as the longitudinal direction, and then the upper anvil 2 Are arranged so as to be intermittently rotated so that the longitudinal direction thereof is directed in the vertical direction (two-dot chain line) in FIG. And it arrange | positions so that the longitudinal direction of the upper anvil 2 may face the direction of 45 degree | times between the above-mentioned up-down direction and the left-right direction, and it presses. Further, the upper anvil 2 is arranged and pressed so as to fill the gaps in directions other than the above-described vertical direction, horizontal direction, and 45 degree direction. In this way, pressing is repeated while intermittently rotating the upper anvil 2 to press the surface of the forged product W evenly.

  By pressing the surface of the forged product W evenly and repeating this several times, the upper and lower surfaces of the forged product W are reversed, and the back surface is similarly pressed and forged, The shape is changed into a disk shape as shown in FIG. 2 so as to be gradually crushed from the front surface side and the back surface side. And the disk-shaped forging Wa of the target shape is obtained.

According to the manufacturing method and the manufacturing apparatus of the disk-shaped forged product Wa according to this reference example , the continuous extending through the central axis O of the lower anvil 1 and extending to one side and the other side in the radial direction perpendicular to the central axis O. Since the to-be-forged object W is pressed and forged by the upper anvil 2 having the two pressing surfaces 2a, the upper anvil 2 can press the vicinity of the center axis of the to-be-forged object W satisfactorily. Therefore, the material in the vicinity of the central axis of the to-be-forged object W is easily plastically flowed by pressing, and is easily strained. Further, since the two pressing surfaces 2a are forged while uniformly pressing one side and the other side of the forged product W around the central axis at the same time, the forged product W is uniformly strained. It is designed to be forged.
And in this embodiment, when four pieces are arranged at an equal angle around the central axis O so that the shape formed by the pressing surface 2a is the X-shape, the pressing for pressing the forged object W at a time. Since the surface is radially arranged in a wider range than the above-described reference example with the central axis O as the center, forging can be performed while applying a strain more evenly in a smaller number of times. Therefore, the composition of the material of the disc-shaped forged product Wa to be manufactured can be formed uniformly, and the number of times of pressing is reduced, so that the time required for forging can be reduced as much as possible.
Further, when three pieces are arranged at an equal angle around the central axis O so that the shape formed by the pressing surface 2a becomes the Y-shape, forging having characteristics intermediate between the above-described reference example and the X-shape is performed. Therefore, forging corresponding to various uses can be performed by selecting these upper anvils 2 in various ways.

  Further, the pressing of the upper anvil 2 is sequentially performed while being arranged in a balanced manner in the circumferential direction so as to fill the gap formed by the immediately preceding pressing position and the preceding pressing position with the center axis O as the center. Therefore, the inside of the to-be-forged product W is more evenly distorted, so that the composition of the material of the disc-shaped forged product Wa to be manufactured can be uniformly formed as a whole, and the shape thereof is made circular. Can keep.

  Moreover, since the area per one time which presses the to-be-forged material W with the upper anvil 2 is small compared with pressing the whole to-be-forged material W, forging to-be-made with a comparatively large outer diameter also with a manufacturing apparatus with small capacity. The object W can be forged. In addition, by forming the pressing surface 2a as a flat surface, after this forging, there is no need for a correction or forging process for processing the surface of the manufactured disk-shaped forged product Wa to be flat again. Costs can be reduced and production efficiency can be improved.

  Moreover, since the shape of the upper anvil 2 is a square bar shape that matches the shape of the pressing surface 2a and is formed as small as possible, the manufacturing cost and equipment cost of the upper anvil 2 can be reduced.

  Moreover, since the width | variety of the central axis O vicinity of the press surface 2a is formed narrower than the width | variety of the edge part of this press surface 2a, when the upper anvil 2 presses the to-be-forged material W, this to-be-forged material W In the vicinity of the central axis O, the direction of escape of the material when pressed / compressed is likely to be given, and plastic flow tends to be easily imparted, resulting in good distortion. Moreover, since the ratio of the pressed area of the surface of the to-be-forged object W is approximated as a whole between the central side in the radial direction and the outer side, the disk-shaped forging that is more evenly distorted and manufactured. The composition of the material of the object Wa can be formed uniformly.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention .

In the present embodiment and the reference example , the pressing surface 2a of the upper anvil 2 is provided with a flat surface in the vicinity of the end portion, which gradually inclines downward toward the end portion. It is good also as changing and forming an angle and length according to the use of a shape forging. Further, the pressing surface 2a may be formed only by a flat surface orthogonal to the central axis O without providing the inclined plane. Alternatively, the pressing surface 2a may be formed in a curved surface as a convex shape without being formed as a flat surface.

It is a longitudinal cross-sectional view which shows the principal part of the manufacturing apparatus of the disk-shaped forging which concerns on one Embodiment and reference example of this invention. It is a longitudinal cross-sectional view which shows the principal part of the manufacturing apparatus of the disk-shaped forging which concerns on one Embodiment and reference example of this invention. It is a top view which shows the principal part of the manufacturing apparatus of the disk-shaped forging based on the reference example of this invention. Is a plan view showing the upper insole of the present embodiment. Is a plan view showing the upper insole of the present embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower anvil 2 Upper anvil 2a Press surface O Center axis W Forging thing Wa Disc-shaped forging

Claims (2)

This is a manufacturing apparatus for obtaining a disk-shaped forging by forging a column-shaped forging between a lower anvil and an upper anvil, and forging while rotating the forging and the upper anvil relatively intermittently. And
The upper anvil has a plurality of pressing surfaces extending in a radial direction perpendicular to the central axis through the central axis of the lower anvil,
The plurality of pressing surfaces are arranged radially from the central axis and include three or four pressing surfaces extending in a radial direction from the central axis,
An apparatus for producing a disk-shaped forged product, characterized in that angles formed between the respective pressing surfaces around the central axis are made uniform . An apparatus for producing a disk-shaped forging according to claim 1,
The disc-shaped forging manufacturing apparatus according to claim 1, wherein a width of the pressing surface in the vicinity of the central axis is formed narrower than a width of an end portion on the radially outer side of the pressing surface.

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