JP3132080B2 - Forging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging method, and more particularly to a method for accurately removing burrs from a forged product.

[0002]

2. Description of the Related Art In an automatic transfer forging machine, a roughly forged product roughly formed by a rough forging die is conveyed to a finish forging die by a transfer device, and after the finish forging by the finish forging die, further deburring by a transfer device. The product is conveyed to a mold, and the product and burrs are cut and separated by the deburring mold. The deburring die is provided with an entry guide for regulating the burr portion of the finished forged product from the outer peripheral direction so that the finished forged product can be set at the processing position.

[0003]

However, in the conventional forging method described above, when the removal of the finished forged product from the finished forging die is not smooth, the forged product may have a phase shift or inclination. When the forged product has a phase shift or inclination, the forged product is transported as it is to the deburring die by the transfer device. Here, as described above, the finished forged product is set in the deburring die in a state where the burr portion is regulated from the outer peripheral direction by the entry guide. Or, the center deviation cannot be corrected. If deburring is performed in this state, a part of the product other than the burr portion is also cut, and a product defect occurs. In addition, even if the clamp portion of the forged product is insufficiently formed and the forged product is shifted in phase or tilted during transportation, the same problem as described above occurs.

The technical problem of the present invention is to form a pin which engages with a positioning hole of a deburring die in a burr portion of a forged product, so that the forged product can be set with no deviation from the deburring die. In this manner, the deburring is performed normally to reduce the occurrence of defective products.

The above-mentioned problems are solved by a forging method having the following steps. That is, in the forging method according to the present invention, a step of roughly forming a material by a rough forging die including a concave portion formed so that material is accumulated in a burr forming portion, and a material inflow passage communicating the concave portion and the product forming portion. A step of finish-forming a coarsely-forged product that has already been roughly formed by a finish-forging die having a portion for forming a pin at a position corresponding to the concave portion of the rough-forging die. Setting the finished forged product in a deburring die while engaging the positioning hole of the deburring die, and performing deburring.

[0005]

According to the present invention, when the forged material is roughly formed by the rough forging die, excess material is accumulated in the concave portion through the material inflow passage of the rough forging die. It is formed. Next, when the rough forged product is finish-formed by the finish forging die, the material pool of the burr portion is formed into a pin shape by a pin forming portion. When the finished forged product is set in the deburring die, the pin portion of the finished forged product is engaged with the positioning hole of the deburring die.
As a result, the finished forged product is positioned with no deviation from the deburring die, and the deburring is performed normally.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows the main parts (A), (B) and (D) of the rough forged product 2 formed by the rough forging die 4 and the rough forging die 4.
(C) is shown. The rough forging die 4 is shown in FIG.
As shown in FIG. 3C, the upper mold 4a and the lower mold 4b are formed, and a product forming part is formed inside when the two molds 4a and 4b are engaged with each other, and an outer burr is formed around the product forming part. A part is formed. The planar shape of the outer burr forming part is a triangular shape with a chamfered vertex, and the outer burr forming surface 4c of the lower mold 4b forming the outer burr forming part corresponds to the inside of each side of the triangle. Are provided with three concave portions 4d. A material inflow groove 4e is formed between the recess 4d and the product molding.

When the material is formed by the rough forging die 4, the material is partially shaped as shown in a sectional view (D) until the upper die 4a engages the lower die 4b in one cycle of pressing. , And is shaped into the shape shown in the sectional view (B). In this rough forming step, excess material flows through the material inflow groove 4e and accumulates in the recess 4d.
In c, three material pools 2d are formed.

FIG. 1 shows a plan view (A) and a cross-sectional view (B) of a finished forged product 6 obtained by forming the above-mentioned rough forged product 2 by a finishing forging die. The finish forging die (not shown) is composed of an upper die and a lower die, and a product forming part is formed inside the two parts in an engaged state, and an outer burr forming part is formed around the product forming part. You. Further, on the outer burr forming surface of the lower die forming the outer burr forming portion, a pin forming portion for forming a tapered pin at a position corresponding to the concave portion 4d of the lower die 4b of the rough forging die 4 is formed. ing. When the rough forged product 2 is finish-formed by the finish forging die, a finished forged product 6 having a product portion 6a and an outer burr portion 6c is obtained. Here, the material pool 2d formed in the outer burr portion 2c of the rough forging 2 is pressed and formed by the pin forming portion of the finish forging die.
A tapered pin 6d having a taper is formed at three places on the outer burr portion 6c of the finished forged product 6.

FIG. 3 is a plan view (A) and BB of a deburring die 10 for performing deburring on the finished forged product 6.
A sectional view (B) is shown. The two-dot chain line indicates the finished forged product 6 set in the deburring die 10.
In the center of the deburring die 10, the product part 6 of the finished forged product 6
An opening 10a having a shape equal to the contour of a is formed, and a cutting edge is provided at an edge portion of the opening 10a. Further, the deburring die 10 is provided with an entry guide 10e that regulates the corners 6e of the outer burr portion 6c of the finished forged product 6 from three locations in the outer peripheral direction. As a result, the finished forged product 6 is set in a state where it is positioned to a certain extent with respect to the deburring die 10.

Further, in the deburring die 10, positioning holes 10d which can be engaged with the tapered pins 6d are formed at positions corresponding to the three tapered pins 6d of the finished forged product 6. Thus, even if the finished forged product 6 is slightly displaced from the deburring die 10, the finishing process is performed in a process in which the tapered pin 6 d of the finished forged product 6 and the positioning hole 10 d of the deburring die 10 are engaged. The forged product 6 is reliably set with no phase shift or center shift with respect to the deburring die 10.

When the finished forged product 6 is set in the deburring die 10, the stripper 12 descends from above as shown in FIG. 4 (B), and the tip 12a of the stripper 12 becomes the outer burr portion of the finished forged product 6. 6c. As a result, the outer burr portion 6c of the finished forged product 6 becomes stripper 1
2 between the tip 12a and the deburring die 10. Then, in this state, the deburring punch 14 descends inside the stripper 12 and contacts the upper surface of the product part 6a of the finished forged product 6. Here, the deburring punch 14
Has an outer diameter that can be inserted into the opening 10a of the deburring die 10 with a predetermined clearance. Therefore, the deburring punch 14 further descends after contacting the upper surface of the product part 6a, and presses the product part 6a into the opening 10a. In this process, the outer burr portion 6c and the product portion 6a of the finished forged product 6 are combined with the cutting blade of the burr removing die 10 and the burr removing punch 14 as shown in FIG.
It is divided between and.

[0012]

According to the present invention, since the finished forged product is positioned without deviating from the deburring die and the deburring is performed normally, the occurrence of defective products is reduced. Further, since the finished forged product can be easily set in the hollow die, the mobility does not decrease.

[Brief description of the drawings]

FIG. 1 is a plan view and a cross-sectional view of a forged product that is finish-formed by a finish forging die.

FIG. 2 is a plan view and a cross-sectional view showing a main part of a forged product roughly formed by a rough forging die and a part of the rough forging die.

FIG. 3 is a plan view and a sectional view of a deburring die.

FIG. 4 is a cross-sectional view illustrating a deburring step of a finished forged product.

[Explanation of symbols]

 Reference Signs List 2 rough forged product 2d material pool 4 rough forging die 4d recess 4e material inflow groove (material inflow passage) 6 finished forged product 6d taper pin (pin) 10 deburring die 10d positioning hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-167049 (JP, A) JP-A-1-180743 (JP, A) JP-A-61-78527 (JP, A) JP-A-62 104643 (JP, A) JP-A-2-59136 (JP, A) JP-A-63-189449 (JP, U) JP-A-1-177035 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00

Claims (1)

(57) [Claims] A step of roughly forming a material by using a rough forging die having a concave portion formed so that a material is stored in a burr forming portion, and a material inflow passage communicating the concave portion with the product forming portion; A step of finish-forming a coarsely forged product that has already been roughly formed by a finish forging die having a part for forming a pin at a position corresponding to the concave portion of the mold, and positioning of a pin of the finished forged product by a deburring die. Setting the finished forged product in a deburring die while engaging the holes, and performing deburring.