JPH06339739A - Method for forging cut material - Google Patents

Abstract

PURPOSE:To prevent the occurrence of surface faults when a cut material is forged in the axial direction and formed in an annular forging plate. CONSTITUTION:Surface faults 21a, 21b caused on projecting and recessed parts existed on the cutting surface of a cut plate are existed on the surface of a 1st disk-like metal plate 21 that metal wire is cut in a specific length and the cut plate is formed with forging in the axial direction. In a time of forming a 2nd disk-like metal plate 31 by forging this 1st disk-like metal plate 21, the surface faults 21b of the die 33 side are upset in a recessed part 33b provided on the surface of the die 33, together the surface faults 21a of a punch 32 side are projected inside the 2nd disk like metal plate 31 with the punch 32. Therefore, because the surface faults 21a, 21b are not moved to the outer circumferential part of the 2nd disk-like metal plate 31, the surface faults are not caused on the disk-like forging plate formed from the material of this outer circumferential part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a forging method in which a metal wire or the like is cut into a predetermined length and is forged in the axial direction to form a ring.

[0002]

2. Description of the Related Art Conventionally, when manufacturing an annular product, first, a rod-shaped material such as a metal wire rod is cut into a predetermined length to make a cutting material, and this cutting material is forged in the axial direction. A widely used manufacturing method is to form a disc-shaped plate material, further forge the plate material to a shape extremely close to a ring of a finished product, and then finish the final shape by machining. The overall flow of this manufacturing method will be described with reference to FIG. 3. In the first step, a metal wire rod 1 heated by a heating device (not shown) is cut into a predetermined length by using a fixed blade 2 and a movable blade 3. Then, the cutting material 4 is obtained. Then, in the second step, the cutting material 4 is freely forged in the axial direction using the punch 22 and the die 23 to form the first disc-shaped plate 21, and then in the third step, the first disc-shaped plate 21 is formed. Punch 32 and die 33
Is further forged to form the second disc-shaped plate member 31. Further, in the fourth step, the second disc-shaped plate material 31 is forged by using the punch 42 and the die 43 to be molded into the bottomed tubular member 41 having an upward opening. The bottomed tubular member 41 comprises an annular portion 41a and a plate-like portion 41b that closes the hole of the annular portion 41a. In the next fifth step, the plate 52 is formed by using a punch 52 and a die 53. An annular forging 51 is obtained by punching out the portion 41b. Then, in the sixth step, the surface of the annular forged material 51 indicated by the imaginary line is machined to obtain the annular ring 60 as a finished product indicated by the solid line.

[0003]

However, the cutting material 4 described above is used.
Since the rod-shaped material 1 is cut using the fixed blade 2 and the movable blade 3, the cut surface 4a has irregularities. Therefore, as shown in FIG. 4, on the surface of the first disk-shaped plate material 21 obtained by forging such a cut material 4 in the axial direction, surface defects 21a and 21b due to the unevenness are formed.
Is occurring. In the forging process, the material of the portion that comes into contact with the surface of the die tends to move outward in the radial direction along the surface of the die.
In the second disk-shaped plate material 31 obtained by further forging No. 1, as shown in FIG. 5, surface defects 31 a such as unevenness due to the surface defects 21 a are likely to occur in the outer peripheral portion of the second disk-shaped plate material 31. . Therefore, in the subsequent forging process, the material of the outer peripheral portion of the second disk-shaped plate material 31 is changed to the annular forged material 51.
When the is molded, surface defects due to the unevenness 31a also occur on the surface. Therefore, in order to remove the surface defect by machining to obtain the ring 60 of the finished product, the machining allowance of machining must be increased, which increases the machining time of machining and deteriorates the yield of material. Therefore, there is a problem that the manufacturing cost becomes high.

Therefore, the present invention has been made in view of the above situation, and in the manufacturing process of forging a cut material obtained by cutting a rod-shaped material to a predetermined length to form a ring, It is an object of the present invention to provide a method for forging so that surface defects do not occur in the steel.

[0005]

In order to solve the above-mentioned problems, the forging method of the present invention is a method in which a rod-shaped raw material is cut into a predetermined length and then forged in the axial direction to form a first plate material. The first plate material is forged into the second plate material while the material of the portion of the first plate material corresponding to the cut surface of the cutting material is set in the recess provided on the surface of the die.

[0006]

The surface defect caused by the unevenness of the cut surface of the cutting material generated on the surface of the first plate material obtained by forging the cutting material in the axial direction is set in the concave portion provided on the surface of the die. Although rare, it is forged into a second plate. As a result, the material of the surface defect portion cannot move radially outward even if it is forged by being set in the recess of the die,
No surface defect due to the surface defect of the first plate material is generated in the outer peripheral portion of the second plate material. As a result, the ring-shaped forged material obtained by further forging the second plate material does not have the surface defects due to the unevenness.

[0007]

Embodiments of the present invention will be described in more detail with reference to the drawings. Further, in the following description, the same parts as those of the conventional example are denoted by the same reference numerals to simplify the description.

The cutting material forging method of the present invention is applied to a forging step of a method of manufacturing an annular ring from a cutting material obtained by cutting a rod-shaped material into a predetermined length. Since the entire flow of this annular ring manufacturing method is the same as that of the conventional example, the explanation will be given based on FIG. 3. In the first step, the metal wire rod 1 heated by a heating device (not shown) is moved with the fixed blade 2. The blade 3 is used to cut into a predetermined length to obtain a cutting material 4. Then, in the second step, the cutting material 4 is freely forged in the axial direction using the punch 22 and the die 23 to form the first disc-shaped plate 21, and then in the third step, the first disc-shaped plate 21 is formed. Further forging is performed using the punch 32 and the die 33 to form the second disc-shaped plate material 31. Further, in the fourth step, the second disc-shaped plate material 31 is forged by using the punch 42 and the die 43 to be molded into the bottomed tubular member 41 having an upward opening. The bottomed tubular member 41 comprises an annular portion 41a and a plate-like portion 41b that closes the hole of the annular portion 41a. In the next fifth step, the plate 52 is formed by using a punch 52 and a die 53. An annular forging 51 is obtained by punching out the portion 41b. Then, in the sixth step, the surface of the annular forged material 51 indicated by the imaginary line is machined to obtain the annular ring 60 as a finished product indicated by the solid line.

Next, the second forging device 30 in the third step to which the method for forging a cut material according to the present invention is applied will be described. As shown in FIG. 1, a cylindrical recess 33b is provided on the surface 33a of the die 33 of the forging device 30. The diameter of the recess 33b is equal to that of the first disc-shaped plate member 2
The size is such that the surface defect portion 21b caused by the cutting surface 4a of the cutting material 4 generated on the die side of 1 can be received therein. Since the surface defect 21b can be clearly discriminated on the surface of the first disc-shaped plate member 21 as shown in FIG. 4, it is easy to set the diameter dimension of the recess 33b. On the other hand, the depth of the recess 33b needs to be such a depth that the surface defect portion 21b can be swallowed and locked so as not to move outward in the radial direction with respect to the forging direction during forging. However, the result of the experiment is 0.
It has been found that a depth of about 5 to 1 mm is sufficient. Further, in this embodiment, since the concave portion 33b has a cylindrical shape, the vertical wall is perpendicular to the surface 33a of the die 33. However, the vertical wall is inclined up to about 45 degrees and the punch 32 is formed. You may make it spread toward the side. Further, a knockout pin 33c is attached to the die 33 so as to be able to move back and forth in the forging direction, and when the forging is completed, the second disk-shaped plate material 31 that is forged by being projected from the bottom surface of the recess 33b is removed from the recess 33b. Has been

Further, as shown in FIG. 1, the tip of the punch 32 reciprocating in the forging direction is provided with a convex portion 32c projecting toward the die 33, and the punch 32 is a first disc-shaped plate material. When forging 21, the second disk-shaped plate material 31
A concave portion 31c is formed on the surface of the.

Next, the operation of the forging device 30 in the third step will be described with reference to FIG. First, when the first disk-shaped plate member 21 is conveyed by a conveying device (not shown) so that its center coincides with the center of the die 33, the punch 32 is attached to the die 33 by a pressing mechanism (not shown). Then, the first disc-shaped plate member 21 is forged to form a second disc-shaped plate member 31. At this time, the convex portion 32
c forms a recess 31c in the surface of the second disk-shaped plate member 31 on the punch 32 side. As a result, as shown in FIG. 1, the material of the surface defect 21 a portion due to the unevenness of the cut surface of the cutting material 2 that has been generated on the surface of the first disc-shaped forging material 21 on the punch 32 side is the tip of the punch 32. The protrusions 32c of the second disk-shaped forging material 31 are pushed into the recesses 31c of the second disc-shaped forging material 31, and thus the material of the surface defect portion 21a has a radius relative to the forging direction during the forging process. Cannot move outward in the direction. Therefore, the second
The surface defect 31a generated on the surface of the disk-shaped forged material 31 on the side of the punch 32 due to the surface defect portion 21a of the first disk-shaped forged material 21 is generated only inside the recess 31c.

On the other hand, as the concave portion 31c is formed on the surface of the punch 32 side, the material of the surface of the second disc-shaped forging material 31 on the die 33 side is set in the concave portion 33b of the die 33, so that the second A convex portion 31d is formed on the surface of the disc-shaped forged material 31 on the die 33 side. At this time, the material of the surface defect 21b portion generated on the surface of the first disc-shaped forging material 21 on the die 33 side is set inside the recess 33b of the die 33 and stays in the recess 33b. Therefore, it cannot move outward in the radial direction during the forging process. Thereby, due to the surface defect 21b on the die 33 side generated in the first disc-shaped forging material 21, the surface defect 31b generated on the die 33 side of the second disc-shaped forged material 31 is the convex portion 31d. Occurs only in. That is, no surface defect occurs in the outer peripheral portion of the second disc-shaped plate material 31 that is forged in the third step.

The second disc-shaped plate material 31 forged and formed in the third step has a bottomed cylindrical forged material 41 in the fourth step.
Is forged. As shown in FIG. 2, the bottomed tubular forging material 41 includes an annular portion 41a and a plate-like portion 41b that closes the inner hole of the annular portion 41a.
Is molded from the material of the outer peripheral portion of the second disk-shaped plate member 31, and the plate-shaped portion 41b is molded from the material of the central portion of the second disk-shaped plate member 31. Therefore, as described above, since the outer peripheral portion of the second disc-shaped plate member 31 has no surface defect, the same circular ring portion 41a of the bottomed tubular member 41 molded from the material of the outer peripheral portion is the same. No surface defects occur. Then, the recess 31c of the second disk-shaped plate member 31
And surface defects 31a and 31b generated on the convex portion 31d
The surface defect caused by is caused by the plate-shaped portion 4 of the bottomed tubular member 41.
The plate-shaped portion 41b will occur on both sides of 1b.
Are punched and removed in the next fifth step. As a result, when the surface of the annular forging material 51 formed in the fifth step is cut to process the final product, the annular ring 60,
Since it is not necessary to increase the cutting allowance in order to remove surface defects as in the conventional case, the number of machining steps can be reduced and the material yield can be improved.

[0014]

According to the method for forging a cutting material of the present invention,
A cut material obtained by cutting a metal wire rod into a predetermined length is forged in the axial direction to form a first plate material, and a material of a portion of the first plate material corresponding to a cut surface portion of the cut material is formed. Since the first plate material is forged into the second plate material while being set in the concave portion provided on the flat surface of the die, the following excellent effects are obtained. That is, according to the method for forging a cutting material of the present invention, the material of the surface defect portion due to the cut surface of the cutting material of the forged first plate material is set in the recess of the die and locked. However, it cannot move radially outward due to forging. As a result, no surface defect occurs in the outer peripheral portion of the second plate member obtained by further forging the first plate member. Therefore, since no surface defect occurs in the annular forged material manufactured by using the material of the outer peripheral portion of the second plate material, in the step of finishing the annular forged material into a ring of a finished product by machining. ,
The cutting allowance can be minimized, the number of machining steps can be reduced, the material yield can be improved, and the manufacturing cost of the ring can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a method for forging a cut material according to the present invention.

FIG. 2 is a second view produced by the method for forging a cut material according to the present invention.
It is a cross-sectional view of a bottomed tubular forging material obtained by forging the disk-shaped plate material of No. 4 in the fourth step.

FIG. 3 is an explanatory view showing each step of a method for producing an annular ring from a conventional metal wire rod.

FIG. 4 is a plan view of a first disk-shaped plate material obtained by forging a cut material in the axial direction.

FIG. 5 is a sectional view showing a conventional forging method in a third step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal wire rod 2 Fixed blade 3 Moving blade 4 Cutting material 21 1st disc-shaped plate material 31 2nd disc-shaped plate material 41 Bottomed cylindrical forging material 51 Annular forging material 60 Circular ring 22 of a finished product 22 2nd process Punch 23 Second process die 32 Third process punch 33 Third process die 42 Fourth process punch 43 Fourth process die 52 Fifth process punch 53 Fifth process die

Claims (1)

[Claims] 1. A method of forging a cutting material obtained by cutting a rod-shaped material into a predetermined length, after forging the cutting material in the axial direction to form a first plate material, and then cutting the cutting material of the first plate material. A method for forging a cutting material, characterized in that the first plate material is forged into a second plate material while the material of a portion corresponding to the cutting surface is set in a recess provided on the surface of the die.