KR102360563B1 - Shaping method for beam of vehicle - Google Patents

Abstract

Disclosed is a method for forming beams which can efficiently manufacture precise beams suitable for small quantity batch production while minimizing work hardening of a material and maintaining mechanical properties. According to one embodiment of the present invention, the method for forming beams forms a material supplied as a continuous coil plate into a formed beam of a prescribed cross sectional shape and comprises: a drawing process of drawing the material into a prescribed forming cross sectional shape by pulling the material in a process direction through the gap between a lower drawing mold and an upper drawing mold combined in front while the front end of the material is clamped by a rear sliding clamper; a hammering process in which a left and a right hammer mold above hammer both corner portions of the forming cross section of the material moving along a hammer die provided behind the drawing process to control the spring-back of an upper corner portion of the forming cross section of the material; and a calibration process of increasing the degree of quality and securing the straightness of the beam while maintaining the forming cross sectional shape of the material while the material is pulled in the process direction through a lower calibration mold and an upper calibration mold combined behind the hammering process.

Description

A method of forming beams {SHAPING METHOD FOR BEAM OF VEHICLE}

The present invention relates to a method for forming beams, and more particularly, a high-tensile plate material that passes through a minimum forming process of a drawing process, a hammering process, and a straightening process by a sliding clamper. It relates to a method of forming beams to be manufactured.

Recently, as a key technology that depends on the survival of the future automobile industry, automobile makers are focusing on developing eco-friendly vehicles to achieve environmental and fuel economy regulations.

Examples of future vehicle technologies include an electric vehicle (EV) that uses electric energy, a hydrogen fueled cell vehicle (hydrogen fueled cell vehicle), and a hybrid electric vehicle (HEV).

The eco-friendly vehicle as described above requires the weight reduction of the vehicle body, and the use of high-tensile steel sheet is increasing for the weight reduction of the vehicle body.

Beams of a certain cross-sectional shape using such high-tensile steel sheets, especially beams such as bumper beams or side sills for car bodies, are manufactured through a forming process such as roll forming. will affect a lot.

The roll forming method is a processing method that sequentially forms a high-tensile steel sheet by passing it between the forming rollers of a continuous roll set. It is a molding method suitable for mass production of small types.

However, this roll forming method requires a large process area with a length of 30M ~ 80M depending on the material or cross-sectional shape of the product to be formed, and requires a large initial investment cost due to the large and complex equipment, and difficulties in management and maintenance. It has the disadvantage of low economic feasibility.

In addition, the roll forming method has a structure in which a lot of surface contact is inevitable due to molding by multi-stage forming rollers, and the material subjected to stress due to such a large number of surface contact has a higher elastic limit or yield point than the original material, so that plastic deformation is not possible. The mechanical properties are lost due to work hardening, which is difficult to occur and has a hard property, so there is a disadvantage that causes product defects such as cracks or fractures during processing by plastic deformation in the subsequent process.

Matters described in this background section are prepared to enhance understanding of the background of the invention, and may include matters that are not already known to those of ordinary skill in the art to which this technology belongs.

An embodiment of the present invention minimizes work hardening of the material and maintains mechanical properties by allowing the high-tensile coil plate to undergo a minimized forming process consisting of a drawing process, a hammering process, and a straightening process by a sliding clamper. An object of the present invention is to provide a method of forming beams that enables efficient production of beams suitable for production.

In one or more embodiments of the present invention, in the beam forming method for forming a material supplied as a continuous coil plate into a forming beam having a constant cross-sectional shape, the material is in a state in which the tip is clamped by a sliding clamper at the rear. , a pultrusion process of pulling in the process direction through between the lower pultrusion mold and the upper pultrusion die molded in the front to form a constant forming cross-sectional shape; The upper left and right hammer molds operate hammering against both corners on the forming cross-section of the material moving along the hammer die configured at the rear of the drawing process to provide spring back of the upper corners on the forming cross-section of the material. controlling hammering process; and a straightening process of increasing the quality and securing the straightness of the beam while maintaining the forming cross-sectional shape of the material while being pulled in the process direction through the lower straightening mold and the upper straightening mold combined at the rear of the hammering process A method of forming beams may be provided.

The lower drawing mold may be installed at the lower portion of the drawing process, and a lower molding surface may be formed in the center of the upper surface including a protrusion having a shape of a final molding cross-section in a flat cross-section along the process direction.

The upper drawing mold is installed on the upper part of the drawing process, and an upper molding surface including a groove portion having a shape of a final molding cross-section in a flat cross-section corresponding to the lower molding surface may be formed in the center of the lower surface.

The hammer die is disposed in the process direction at the rear of the drawing process, and a support surface having the same shape as the molding cross-section of the material may be formed in the center of the upper surface.

The left and right hammer molds may each be hammered with respect to both edge portions of the material on the hammer die with the same cycle of front and rear force.

The lower orthodontic mold is installed at the lower part of the straightening process, and a lower orthodontic molding surface made of a protrusion having a shape of a final molding cross-section may be formed in the center of the upper surface along the process direction.

The upper orthodontic mold is installed in the upper part of the orthodontic process, and an upper orthodontic molding surface comprising a groove portion having a shape of a final molding cross-section corresponding to the lower orthodontic molding surface may be formed in the center of the lower surface.

The pressing force of the upper straightening mold with respect to the lower straightening mold in the straightening process may be set to be smaller than the pressing force of the upper drawing mold with respect to the lower drawing mold of the drawing process.

It may further include a cutting process of cutting into beams of a certain length by operating a cutting blade with respect to the material passing through the cutting die while being pulled in the process direction from the rear of the straightening process.

The material may be made of a high-tensile aluminum plate, and may be made of a high-tensile steel plate.

The embodiment of the present invention is a minimized molding process consisting of a drawing process, a hammering process, and a straightening process, and it is possible to precisely mold while maintaining mechanical properties by minimizing work hardening of the material. It is efficient in the production of shaped beams suitable for production.

An embodiment of the present invention is a cold forming method using sliding friction, and it is possible to efficiently form the required cross section without impairing the mechanical properties of the material due to external force during forming, thereby stabilizing the quality of the post process.

In the embodiment of the present invention, the length of the process line is shorter than that of the existing roll forming equipment, and thus the area occupied by this is small, so the incidental cost is low, and maintenance and management are easy.

The embodiment of the present invention can be produced by changing the cross-sectional shape only by replacing each mold in the drawing process, the hammering process, and the straightening process, which is advantageous for small-volume, multi-variety production.

In the embodiment of the present invention, since the molding process is minimized and formed, an immediate response to the cross-sectional quality is possible, and quality improvement can be expected by stabilizing the quality.

The embodiment of the present invention can increase productivity because the cross-section forming speed is faster than that of the conventional roll forming method.

1 is a block diagram of a process according to a method of forming beams according to an embodiment of the present invention.
2 is a conceptual diagram of a process according to a method of forming beams according to an embodiment of the present invention.
3 is a cross-sectional view of a mold in a drawing process applied to a method for forming beams according to an embodiment of the present invention.
4 is a cross-sectional view of a mold of a hammering process applied to a method of forming beams according to an embodiment of the present invention.
5 is a cross-sectional view of a mold in a calibration process applied to a method for forming beams according to an embodiment of the present invention.
6 is a cross-sectional view of a mold in a cutting process applied to a method of forming beams according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of description, and in order to clearly explain the embodiment of the present invention, parts irrelevant to the description will be omitted.

1 is a block diagram of a process according to a method of forming beams according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a process according to a method of forming beams according to an embodiment of the present invention.

1 and 2, the forming method of beams according to an embodiment of the present invention uses a continuous coil plate, in particular, a high-tensile steel plate or a high-tensile aluminum plate as a material (1), a drawing process, a hammering process, and a calibration process Through three forming processes consisting of

The forming method of beams according to an embodiment of the present invention is a material (1) supplied as a continuous coil plate through a drawing process (S1), a hammering process (S2), a straightening process (S3), and a cutting process (S4) to form beams having a shape of a certain forming cross-section.

Here, the material 1 may be made of a high-tensile aluminum sheet or a high-tensile steel sheet, but is not necessarily limited thereto. In general press forming or roll forming, a material having poor formability may be applied.

The drawing process (S1) is performed by the lower drawing mold 11 and the upper drawing die 13 combined in the front.

That is, the material 1 is pulled in the process direction through between the combined lower drawing mold 11 and the upper drawing die 13 with the tip clamped by the sliding clamper 3 at the rear in the process direction to have a constant forming cross-sectional shape. pultrusion molded with

3 is a cross-sectional view of a mold in a drawing process applied to a method for forming beams according to an embodiment of the present invention.

Referring to FIG. 3, the lower drawing mold 11 is installed at the lower part of the drawing process S1, and in the center of the upper surface along the process direction, the lower molding surface F11 consisting of a protrusion having the shape of the final molding cross-section in the flat section is is formed

In addition, the upper drawing mold 13 is installed in the upper part of the drawing process S1, and in the center of the lower surface, corresponding to the lower molding surface F11, the upper molding surface F13 consisting of a groove having the shape of the final molding cross-section in a flat cross-section. this is formed

In this drawing process, the shape can be realized by vibrating the mold in the process of passing the material 1 between the lower drawing die 11 and the upper drawing die 13, and at the same time, each drawing die 11 and 13 and the material ( 1) By minimizing the friction between them, the generation of frictional heat and wear of the mold can be minimized.

In addition, the drawing molds 11 and 13 should be designed to shape the final cross-sectional shape of the molding target by progressively advancing the material 1, and to express the stretch molding effect of the material 1 Also, it is designed in consideration of springback and elongation according to the characteristics of the material.

On the other hand, in order to secure the durability of the drawing molds 11 and 13, a heat treatment method according to the material 1 is performed, and the lower molding surface F11 and the upper molding surface F13 to secure the roughness of the mold surface. A special surface coating can be applied to

The hammering process (S2) is performed by a hammer die 21 configured at the rear of the drawing process S1, and left and right hammer molds 23 and 25 configured on both upper sides of the hammer die 21. proceeds

That is, the upper left and right hammer molds 23 and 25 move forward and backward with respect to both corners on the molding cross-section of the material 1 moving along the hammer die 21 and perform hammering molding to form the material (1) Controls the spring back of the upper edge on the molding cross-section of

4 is a cross-sectional view of a mold of a hammering process applied to a method of forming beams according to an embodiment of the present invention.

4, the hammer die 21 is disposed and installed in the process direction at the rear of the drawing process S1, and a support surface F21 having the same shape as the molding cross-section of the material 1 is formed in the center of the upper surface. do.

In addition, the left and right hammer molds 23 and 25 are each configured to hammer against both side corners of the material 1 on the hammer die 21 with the same cycle of front and rear force.

The hammer die 21 and both sides of the hammer molds 23 and 25 are non-uniform springs of the bent part formed by the material 1 passing through the lower drawing die 11 and the upper drawing die 13 of the drawing process S1. It controls the bag to ensure the reproducibility of the product.

On the other hand, the hammer die 21 and both sides of the hammer molds 23 and 25 are selected as materials with high toughness in order to prevent them from being damaged by periodic vibration, and toughness can be secured through appropriate heat treatment.

The straightening process (S3) proceeds through the lower orthodontic mold 31 and the upper straightening mold 33 combined at the rear of the hammering process (S2).

That is, while maintaining the forming cross-sectional shape of the material 1 as it is pulled in the process direction through the lower straightening mold 31 and the upper straightening mold 33 combined at the rear of the hammering process (S2), the degree of quality is increased and molding It ensures the straightness of the beams.

5 is a cross-sectional view of a mold in a calibration process applied to a method for forming beams according to an embodiment of the present invention.

Referring to Figure 5, the lower orthodontic mold 31 is installed at the lower portion of the orthodontic process (S3), the lower orthodontic molding surface (F31) consisting of a protrusion of the shape of the final molding cross-section along the process direction is formed in the center of the upper surface. .

In addition, the upper orthodontic mold 33 is installed in the upper part of the orthodontic process (S3), and the upper orthodontic molding surface (F33) made of a groove in the shape of the final molding cross-section corresponding to the lower orthodontic molding surface (F31) in the center of the lower surface this is formed

Here, the pressing force of the upper drawing die 13 with respect to the lower drawing die 11 of the drawing process (S1) is about 23 tons when using an ultra-high rigidity plate of 1 GPa as a material. At this time, the The pressing force of the upper orthodontic mold 33 with respect to the lower orthodontic mold 31 of the orthodontic process (S3) may provide a load of about 18 tons, but may be adjusted according to the material.

However, the pressing force of the upper straightening mold 33 against the lower straightening mold 31 in the straightening process (S3) is the pressing force of the upper drawing mold 13 with respect to the lower drawing mold 11 in the drawing process (S1). It must be set smaller than that to prevent abnormal deformation of the product.

This calibration process (S3) increases the degree of quality while maintaining the molded cross-sectional shape, and secures the straightness of the product.

The cutting process (S4) is performed by moving the cutting blade 43 with respect to the material 1 passing through the cutting die 41 while being pulled in the process direction from the rear of the straightening process S3 to cut it into beams of a certain length. do.

6 is a cross-sectional view of a mold in a cutting process applied to a method of forming beams according to an embodiment of the present invention.

Referring to FIG. 6 , it proceeds by a cutting blade 43 configured to ascend and descend between the front and rear cutting dies 41 .

That is, it is configured to cut the material 1 to a predetermined length while the cutting blade 43 descends with respect to the material 1 passing through the cutting die 41 along the process direction.

As described above, the method for forming beams according to an embodiment of the present invention is a minimized forming process consisting of a drawing process (S1), a hammering process (S2), and a straightening process (S3) to work harden the material (1). By minimizing it, it becomes possible to precisely mold while maintaining mechanical properties. In addition, since the molding process is minimized, it is possible to efficiently manufacture beams suitable for small quantity production of various types.

In addition, the forming process by the forming method of beams according to an embodiment of the present invention is a cold forming method using sliding friction, and the required cross section is efficiently formed without impairing the mechanical properties of the material 1 due to external force during forming. This enables the quality stabilization of post-processing and at the same time has the effect of reducing the manufacturing cost.

In addition, the forming method of beams according to an embodiment of the present invention has a shorter length of the process line compared to the conventional roll forming equipment, and thus the area occupied by this is small, so the incidental cost is low, and maintenance and management are easy.

In addition, the forming method of beams according to an embodiment of the present invention is easy to produce by changing the cross-sectional shape only by replacing each mold in the drawing process 10, hammering process (S2), and correction process (S3). advantageous to

In addition, since the forming method of beams according to the embodiment of the present invention is formed by minimizing the forming process, it is possible to immediately respond to the cross-sectional quality, and thereby, quality stabilization and quality improvement can be expected.

In addition, the forming method of beams according to an embodiment of the present invention can increase productivity because the cross-section forming speed is faster than that of the conventional roll forming method.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and it can be easily changed by a person skilled in the art from the embodiment of the present invention to equivalent Including all changes to the extent recognized as being

1: Material
3: Sliding clamper
S1: drawing process
S2: Hammering process
S3: Calibration process
S4: Cutting process
11: Lower drawing mold
13: upper drawing mold
21; hammer die
23,25; Left and right hammer mold
31: lower straightening mold
33: upper straightening mold
41: cutting die
43: cutting blade

Claims (20)

In order to shape the material supplied as a continuous coil plate into a forming beam of a constant cross-sectional shape, the material is clamped at the tip by the sliding clamper at the rear, and the process is performed between the lower drawing mold and the upper drawing mold combined in the front The upper left and right hammer molds are hammered for the pultrusion process of pulling in the direction and pultrusion forming into a predetermined cross-sectional shape, and the upper left and right hammer molds for both corners on the forming cross-section of the material moving along the hammer die configured at the rear of the pultrusion process A hammering process that operates to control the spring back of the upper edge on the forming section of the material, and the lower orthodontic mold and the upper straightening mold combined in the rear of the hammering process are pulled in the process direction through the forming section of the material In the forming method of beams, including a calibration process of increasing the degree of quality while maintaining the shape and securing the straightness of the beams,
The hammer die is disposed in the process direction at the rear of the drawing process, and a support surface having the same shape as the molding cross-section of the material is formed in the center of the upper surface,
The left and right hammer molds are each a forming method of beams for hammering with respect to both sides of the edge of the material on the hammer die with the same cycle of front and rear force. According to claim 1,
The lower drawing mold is
A method of forming beams, which is installed at the lower part of the drawing process and has a lower forming surface comprising a protrusion in the shape of a final forming cross-section in a flat cross-section along the process direction in the center of the upper surface. 3. The method of claim 2,
The upper drawing mold is
A method of forming beams that is installed on the upper part of the drawing process, and an upper molding surface comprising a groove portion having a shape of a final molding cross-section in a flat cross-section corresponding to the lower molding surface is formed in the center of the lower surface. delete delete According to claim 1,
The lower orthodontic mold is
A method of forming beams that is installed in the lower part of the straightening process, and that a lower straightening molding surface is formed in the center of the upper surface along with a protrusion having the shape of the final molding cross-section along the process direction. 7. The method of claim 6,
The upper orthodontic mold is
A method of forming beams that is installed in the upper part of the straightening process and has an upper straightening molding surface comprising a groove part having a shape of a final molding cross-section corresponding to the lower straightening molding surface in the center of the lower surface. According to claim 1,
The pressing force of the upper straightening mold with respect to the lower straightening mold in the straightening process is set to be smaller than the pressing force of the upper straightening mold with respect to the lower drawing mold of the drawing process. According to claim 1,
The forming method of beams further comprising a cutting step of cutting into beams of a certain length by operating a cutting blade with respect to the material passing through the cutting die while being pulled in the process direction from the rear of the straightening step. According to claim 1,
The material is
A method of forming beams made of high-tensile aluminum sheet. According to claim 1,
The material is
A method of forming beams made of high-tensile steel sheet. delete delete delete delete delete delete delete delete delete

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