KR101667645B1

KR101667645B1 - method for chamfering metal components

Info

Publication number: KR101667645B1
Application number: KR1020150092958A
Authority: KR
Inventors: 진성필; 김지원
Original assignee: (주) 엠에스텍
Priority date: 2015-06-30
Filing date: 2015-06-30
Publication date: 2016-10-20

Abstract

According to the present invention, a method for chamfering a metal component comprises: a half-piercing step of punching a metal material using a first punch in a first direction without penetrating the metal material; a chamfering step of forging a round chamfer formed by punching of the first punch using a second punch having a punching width wider than a punching width of the first punch in the first direction; and a full-piercing step of punching the metal material using a third punch having a punching width narrower than the punching width of the second punch and wider than the punching width of the first punch while passing a forged chamfer surface in a second direction opposite to the first direction to penetrate the metal material.

Description

[0001] METHOD FOR CHAMFERING METAL COMPONENTS [0002]

TECHNICAL FIELD The present invention relates to a metal part processing technique, and more particularly, to a chamfering method for a metal part.

As the chamfering is performed on the corner portion of the metal part, the corner portion of the metal part is subjected to the force by the chamfer punch. As a result, there is a high possibility that the dimension of the side portion of the metal part after the chamfering process is changed, and the possibility of a burr is also high.

1 is a view showing a process in which milling bur is generated by a conventional chamfering method.

FIG. 1 (a) shows burrs formed under the metal plate by punching (piercing, blanking, etc.) against the metal plate. Fig. 1 (b) conceptually shows that a chamfering process is performed to remove burrs generated in Fig. 1 (a). Fig. 1 (c) shows that milling bur has been formed in the lower part of the metal sheet by the chamfering in Fig. 1 (b).

Korean Patent Publication No. 10-2013-0134435

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a chamfering method for a metal part that can prevent the occurrence of milling burrs after chamfering after punching.

The technical objects to be achieved by the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

According to an aspect of the present invention, there is provided a method of machining a metal part chamfer according to an embodiment of the present invention includes: a half-piercing step in which a metal material is not passed through a first punch in a first direction; A chamfering step of forging a round chamfer formed by punching the first punch with a second punch having a punch width larger than a punch width of the first punch in the first direction; And a third punch having a punch width smaller than a punch width of the second punch and wider than a punch width of the first punch in a second direction opposite to the first direction, Piercing step to pass through the piercing step.

The half-piercing may be up-piercing under the metal material, and the full-piercing may be down-piercing on the top of the metal material. And, in some cases, the opposite.

The die used in the chamfering step may have a shape in which the metal material protruding in the second direction is accommodated by the half-piercing.

According to another aspect of the present invention, there is provided a method for machining a metal part chamfer, comprising: passing a metal material along a line for forming at least a part of an outline of a metal part in a first direction with a first punch A half-piercing step to avoid touching; Chamfering a round chamfer formed by punching the first punch with a second punch in the first direction; And a full-piercing step, in a second direction opposite to the first direction, with a third punch, to pass through the metal material while passing through the forged chamfer.

According to the method for machining a metal part chamfer according to the present invention, unlike the conventional chamfering, it is possible to prevent the occurrence of the milling burr due to chamfering.

According to the method for machining a metal part chamfer according to the present invention, it is possible to manufacture a part having a clean cut surface without occurrence of burrs, and it is possible to prevent a safety accident caused by burrs.

1 is a view showing a process in which milling bur is generated by a conventional chamfering method.
2 is a flowchart showing an example of a chamfering method of a metal part according to the present invention.
FIG. 3 is a view showing an example in which a chamfering method of a metal part according to the present invention shown in FIG. 2 is performed.
Fig. 4 shows examples of the shape of a die used in a chamfering method of a metal part according to the present invention.
5 is a view illustrating a process of machining a chamfer of a metal part according to another embodiment of the present invention.

For a better understanding of the present invention, its operational advantages and features, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which form a preferred embodiment of the invention, and the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a flowchart showing an example of a chamfering method of a metal part according to the present invention. FIG. 3 is a view showing an example in which a chamfering method of a metal part according to the present invention shown in FIG. 2 is performed.

First, half-piercing is performed in a first direction so as not to pass through a metal material with a first punch (S100). At this time, the first direction may be the downward direction of the metal material. That is, the half-piercing can be up-piercing, which punches with a punch under the metal material.

Meanwhile, in another embodiment of the present invention, the first direction may be the upper direction of the metal material. In this case, the half-piercing may be down-piercing, which is punched over the top of the metal material. The second direction to be looked forward is the opposite direction to the first direction. That is, when the first direction is above the metal plate, the second direction is below the metal plate, and when the first direction is below the metal plate, the second direction is above the metal plate.

Figure 3 (a) shows that the half-piercing is performed. Referring to FIG. 3A, it can be seen that half-piercing of the punch width W1 is performed by punching in the downward direction of the metal plate. Then, the metal plate is pushed up, some cut surfaces are formed, and a pressed surface (i.e., round chamfer) having a curvature R1 is formed at a portion where cutting is started.

And a second chamfering step of chamfering a round chamfer formed by punching the first punch with a second punch having a punch width larger than a punch width of the first punch in the first direction after the half piercing is performed, ) Is performed. The number of forging operations may be one or two or more times.

FIG. 3 (b) shows that the chamfering is performed, and FIG. 3 (c) shows the result of performing the chamfering. 3 (b) and 3 (c), a round punch formed by the half-piercing is forged with a first punch having a punch width W2 wider than the punch width W1 of the first punch, C1) is formed.

A third punch having a punch width smaller than a punch width of the second punch and wider than a punch width of the first punch in a second direction opposite to the first direction after the chamfering is performed, Full-piercing is performed to pass through the metal material as it passes through the chamfered surface.

Fig. 3 (c) shows that full-piercing is performed in the state in which the chamfering is performed, and Fig. 3 (d) shows the result in which the full-piercing is performed. Referring to Figures 3 (c) and 3 (d), it can be seen that full-piercing is performed with a third punch having a punch width W3 passing through the forged chamfer surface C1 after chamfering has been performed .

In the lower part of the metal material, a part of the forged chamfer surface is removed by piercing so that the final chamfer surface (C1 ') remains do. At this time, no burr is generated on the final chamfer surface because the strength of the structure near the chamfer surface C1 is increased by at least one forging process in the chamfering process.

On the other hand, as shown in Fig. 3, the pulling width W3 in the full-piercing is narrower than the pulling width W2 in the chamfering but wider than the pulling width W1 in the half-piercing. And, the pulling width W3 in the full-piercing is preferably covered by the half-pierced and chamfered portions of the metal material.

Fig. 4 shows examples of the shape of a die used in a chamfering method of a metal part according to the present invention.

Referring to FIG. 4 (a), it can be seen that a planar die can be used in the half-piercing operation in the downward direction of the metal material, considering the portion where the metal material is pushed up. On the other hand, since the punch does not completely pass through the metal material during the half-piercing, there is no need for a knock-out structure for removing scrap from the top.

Referring to FIG. 4 (b), it can be seen that when the chamfering in the downward direction of the metal material is performed, the die may be in a planar shape considering a portion where the metal material is pushed up.

Referring to FIG. 4C, when the chamfering in the downward direction of the metal material is performed, it can be seen that the die may be in the form of a groove provided with a portion where the metal material is pushed up. That is, the die used in the chamfer may have a groove in which a metal material protruding above the metal material is received by half-piercing. On the other hand, although not shown in the drawing, the die used for chamfering may have a planar shape in which the metal material contacts the pushed-up portion.

Referring to FIG. 4 (d), it can be seen that in the full-piercing step, a planar die can be used, taking into account the extent to which the punch passes. Although not shown in the drawings, the full-piercing die may have a green-out structure for discharging scrap to the die underneath.

5 is a view illustrating a process of machining a chamfer of a metal part according to another embodiment of the present invention. For reference, the chamfering may be performed during the notching process. However, the scope of the present invention is not limited thereto.

Figure 5 (a) is a side view of the metal part in a first direction (i.e., in a downward direction of the metal material), in which a first punch is engaged so as not to pass through the metal material along a line to form at least a part of the outline of the metal part Indicating that half-piercing has been performed. Then, at the start of the cutting of the metal material, a round chamfer of curvature R3 is formed, and the metal material is pushed up.

Fig. 5 (b) shows that chamfering is performed for forging the round chamfer formed by punching the first punch with the second punch in the first direction. Then, the round chamfer formed by the half-piercing is forged with a chamfer surface C2 of a straight section.

Fig. 5 (c) shows a full-piercing process in which a third punch, in a second direction opposite to the first direction, punches through the metal material through the forged chamfered surface c2, ) Is performed. Referring to FIG. 5 (c), it can be seen that a portion of the forged chamfer surface C2 is removed and the remaining portion C2 'remains at the bottom of the metal material. Also, since the structure near the chamfered surface C2 is strengthened by forging in Fig. 5 (b), it can be seen that burrs do not occur even if full-piercing is performed. A round chamfer of curvature R4 is formed in the portion of the metal material at which cutting is started by pull-piercing. That is, burrs may not be generated in the outline of the metal parts processed by the chamfering method of the metal part shown in Fig.

The die structure according to each process described with reference to FIG. 4 can be similarly applied to the example of FIG. It will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

R1, R2, R3, R4: radius of curvature W1, W2, W3:
C1, C1 ', C2, C2': chamfer faces

Claims

A half-piercing step in which, in the first direction, the first punch does not pass through the metal material;
A chamfering step of forging a round chamfer formed by punching the first punch with a second punch having a punch width larger than a punch width of the first punch in the first direction; And
A third punch having a punch width smaller than a punch width of the second punch and wider than a punch width of the first punch in a second direction opposite to the first direction, Piercing a metal part to be machined to pass through.

The method of claim 1, wherein the half-
Up-piercing under the metal material,
The full-
Characterized in that it is a down-piercing applied above the metal material.

The method of claim 1, wherein the half-
Down-piercing on the top of the metal material,
The full-
Wherein the metal material is an up-piercing under the metal material.

2. The method of claim 1, wherein the die used in the chamfering step comprises:
Wherein the metal material protruding in the second direction is received by the half-piercing.

Half-piercing step in a first direction, in a first punch, so as not to pass through a metal material along a line forming at least part of the outline of the metal part;
Chamfering a round chamfer formed by punching the first punch with a second punch in the first direction; And
A full-piercing step of punching a metal material through a forged machined chamfer with a third punch in a second direction opposite to the first direction; .