KR-20260062498-A - Forming apparatus of metallic material for vehicle capable of spring back compensation and forming method thereof

KR20260062498AKR 20260062498 AKR20260062498 AKR 20260062498AKR-20260062498-A

Abstract

The present invention relates to a metal material forming apparatus and forming method for automobiles capable of springback correction, comprising: a lower mold having a seating portion formed thereon for a front side rear member pre-formed by a press; at least one pair of forming surface processing control units installed on both sides of the lower mold so as to be movable in a direction close to or apart from the seating portion, wherein the forming surface processing control units press both sides of the seat cross member seated on the seating portion, and wherein the pressing position for pressing both sides of the front side rear member is variable; an upper mold installed on the upper part of the lower mold so as to be movable vertically, which presses the central region of the front side rear member seated on the seating portion while simultaneously pressing the forming surface processing control units in a direction close to the seating portion; and a control unit for controlling the operation of the upper mold and the forming surface processing control units; a material characteristic measurement step for measuring the material characteristics of a front side rear member pre-formed by a press; and based on the material characteristics of the seat cross member measured in the material characteristic measurement step, the front side rear member A first forming error correction step for predicting the forming pressure and forming conditions of a metal material forming device for an automobile to be formed; a first press forming step for feeding the front side rear member into the metal material forming device for an automobile and forming the front side rear member first at the forming pressure and forming conditions predicted in the first forming error correction step; a product shape detection step for detecting the shape of the front side rear member formed through the first press forming step; a second forming error correction step for analyzing the shape of the front side rear member detected in the product shape detection step to determine the amount and type of springback displacement and predicting the forming pressure and forming conditions of the metal material forming device for an automobile according to the determined amount and type of springback displacement; and a second press forming step for re-feeding the front side rear member into the metal material forming device for an automobile and forming the front side rear member second at the forming pressure and forming conditions of the metal material forming device for an automobile predicted in the second forming error correction step. It is made of a metal material forming method for automobiles. According to the present invention as described above, the defect rate of the finally manufactured front side rear member can be significantly reduced by predicting the forming pressure and forming conditions of a metal material forming device for automobiles based on the material characteristics, springback displacement amount, and type of the front side rear member formed from an ultra-high-strength steel plate through a press, and correcting the springback displacement amount.

Inventors

이상구
남성우
이정흠
김대인

Assignees

대우공업 (주)

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (4)

A lower mold having a seating portion formed therein on which a front side rear member, pre-formed through a press, is seated; At least one pair of molding surface processing control parts installed on both sides of the lower mold so as to be movable in a direction close to or apart from the seating portion, and pressing both sides of the front side rear member seated on the seating portion, wherein the pressing position for pressing both sides of the front side rear member is variable; An upper mold installed so as to be vertically movable on the upper part of the lower mold, and simultaneously pressing the central area of the front side rear member seated on the seating portion and pressing the molding surface processing control portion in a direction approaching the seating portion; An automotive metal material forming device capable of springback correction, characterized by including a control unit for controlling the operation of the upper mold and the forming surface processing control unit.
In paragraph 1, The molding surface processing control part At least one pair of movable plates installed on both sides of the lower mold so as to be movable in a direction close to or farther from the seating portion; An operating cam having a block shape with open inner and outer sides, fixedly installed on the upper part of the movable plate, and which moves the movable plate in a direction close to the seating portion when one side is pressed by an upper mold; A molding cam that extends from one inner side of the operating cam toward the seating portion, and when the movable plate moves toward the seating portion, the extended inner end presses against one side of the side of the front side rear member; A driving means for adjusting the position of the inner end of the forming cam, which is installed on one side of the moving plate and connected to one side of the forming cam, and which moves the forming cam in a direction close to or farther away from the seating portion to press one side of the side of the front side rear member; A metal material forming apparatus for automobiles capable of springback correction, characterized by including an elastic member interposed between the inner end of the movable plate and the outer end of the seating portion, which applies an elastic force to cause the movable plate to return to a direction separated from the seating portion when the pressing force of the upper mold is released.
In paragraph 1, The above forming cam is A plurality of air supply channels are formed at regular intervals along the width direction to spray heated air through an inner end, and an installation space is further formed on one side of the inner end to communicate with the plurality of air supply channels along the width direction, A pressurizing block having a block shape corresponding to the above-mentioned installation space, wherein the upper and lower surfaces are slidably coupled in an inward or outward direction to one side of the inner surface of a corresponding molding cam, and a space is formed inside, wherein a plurality of first outlet holes communicating with the plurality of air supply passages and the space are formed on one side of the outer end, and a plurality of second outlet holes communicating with the space are formed on one side of the inner end; An elastic member having both ends fixedly coupled between the outer end of the pressure block and one side of the inner surface of the molding cam in which the installation space is formed; A metal material forming device for automobiles capable of springback correction, further comprising a pressure induction unit including a rotating shaft rotatably installed on both opposing inner sides in the width direction of the pressure block in which the space is formed, arranged along the width direction of the space, a plurality of rotating blades formed as plate-shaped members protruding radially on one side of the outer surface of the rotating shaft corresponding to the plurality of first outlet holes, and a plurality of weight bodies eccentrically coupled to the other side of the outer surface of the rotating shaft arranged between the plurality of rotating blades.
A material property measurement step for measuring the material properties of a front side rear member pre-formed through a press; A first forming error correction step for predicting the forming pressure and forming conditions of a metal material forming device for an automobile to form the front side rear member based on the material characteristics of the front side rear member measured in the above material characteristic measurement step; A first press forming step of feeding the above-mentioned seat cross member into the above-mentioned metal material forming device for automobiles and first forming the above-mentioned front side rear member with the forming pressure and forming conditions predicted in the first forming error correction step; A product shape detection step for detecting the shape of a front side rear member formed through the above first press forming step; A second forming error correction step for analyzing the shape of the front side rear member detected in the product shape detection step to determine the amount and type of springback displacement, and predicting the forming pressure and forming conditions of the metal material forming device for automobiles according to the determined amount and type of springback displacement; A method for forming a metal material for an automobile capable of springback correction, characterized by including a second press forming step in which the front side rear member is reintroduced into the metal material forming device for an automobile and the front side rear member is secondarily formed according to the forming pressure and forming conditions of the metal material forming device for an automobile predicted in the second forming error correction step.

Description

Forming apparatus of metallic material for vehicle capable of spring back compensation and forming method thereof The present invention relates to a forming apparatus and a forming method for metal materials for automobiles, and more specifically, to a forming apparatus and a forming method for metal materials for automobiles capable of springback correction, which can significantly reduce the defect rate of the finally manufactured front side rear member by predicting the forming pressure and forming conditions of the metal material forming apparatus for automobiles based on the material characteristics, springback displacement amount, and type of the front side rear member formed from an ultra-high-strength steel plate through a press, and correcting the springback displacement amount. Recently produced automobiles are becoming more intelligent for the convenience of drivers and passengers, and the adoption of convenience features is accelerating. Along with this, the application of safety devices to further enhance passenger safety is also increasing. In this context, the vehicle body frame is the most critical element for ensuring passenger safety, and it is manufactured in various forms and structures. In particular, ultra-high-strength steel plates with a tensile strength of 1.2 GPa to 1.5 GPa are being actively applied to side sill members, seat cross members, front side members, and door impact members, which require structural and crash stability within the vehicle body frame, in order to improve the safety performance and reduce weight of the vehicle. Meanwhile, the front side member (Seat cross member) of the vehicle body frame is positioned on both sides of the front of the vehicle, that is, on both sides of the engine, and supports the front of the vehicle body to absorb impact during frontal and side collisions while maintaining rigidity, thereby protecting the engine located inside and enhancing the safety of the occupants. It includes a front side front member positioned at the front and a front side rear member positioned behind the front side front member, and is a very important element directly related to safety in the event of an accident. These seat cross members are typically formed using a press, but press forming imposes many limitations on the shape of the product to be formed, the thickness of the material, and the forming process, such as with ultra-high-strength steel sheets. In other words, when manufacturing a front side member (seat cross member) by press forming an ultra-high-strength steel plate with a tensile strength of 1.2 GPa to 1.5 GPa, excessive spring back occurs, making shape control difficult and frequently resulting in forming defects. In particular, in the case of conventional press forming devices for forming front side members as described above, there was a problem in that even if springback occurred after forming the front side member, it was not possible to correct it or change the forming conditions of the press according to the degree of deformation of the springback. Therefore, there is an urgent need for a device and method capable of compensating for springback even if it occurs after forming the front side member, or changing the forming conditions of the press according to the degree of deformation of the springback. FIG. 1 is a perspective view of a front side rear member for an automobile formed through a metal material forming device for an automobile according to an embodiment of the present invention. FIG. 2 is a drawing for explaining the springback occurrence area of a front side rear member for an automobile, FIG. 3 is a schematic diagram for explaining a metal material forming device for an automobile according to one embodiment of the present invention, FIG. 4 is a perspective view of a molding surface processing control unit according to one embodiment of the present invention, FIGS. 5a to 5c are drawings for explaining the operation of a metal material forming device for an automobile according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a forming cam according to another embodiment of the present invention, FIG. 7 is a schematic perspective view of a pressure induction unit according to another embodiment of the present invention, FIGS. 8a and 8b are drawings for explaining the operation of a forming cam according to another embodiment of the present invention, FIG. 9 is a flowchart illustrating a method for forming a metal material for an automobile according to an embodiment of the present invention. The present invention will be described in more detail below with reference to the drawings. It should be noted that identical components in the drawings are indicated by the same reference numerals wherever possible. Furthermore, detailed descriptions of known functions and configurations that could unnecessarily obscure the essence of the invention are omitted. FIG. 1 is a perspective view of a