KR-20260062502-A - Press forming apparatus of door impact member for vehicle and press forming method thereof

KR20260062502AKR 20260062502 AKR20260062502 AKR 20260062502AKR-20260062502-A

Abstract

The present invention relates to a forming apparatus and method for a metal material for automobiles capable of correcting forming errors, comprising: a lower mold having a seating portion formed thereon for a door impact 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 pressing position for pressing the two sides of the door impact member seated on the seating portion is variable; an upper mold installed on the upper part of the lower mold so as to be movable vertically, which presses the central area of the door impact 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 seat cross member pre-formed by a press; and based on the material characteristics of the door impact member measured in the material characteristic measurement step, the door impact 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 a member; a first press forming step for feeding the door impact member into the metal material forming device for an automobile and forming the door impact 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 door impact member formed through the first press forming step; a second forming error correction step for analyzing the shape of the door impact 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 door impact member into the metal material forming device for an automobile and forming the door impact 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 method for forming a metal material for automobiles that includes. According to the present invention as described above, the defect rate of the finally manufactured door impact 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 door impact member formed from an ultra-high-strength steel plate through a press, and correcting the forming error.

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 thereon for a door impact member pre-formed through a press; At least one pair of molding surface processing control parts are 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 press both sides of the door impact member seated on the seating portion, wherein the pressing position for pressing both sides of the door impact 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 door impact member seated on the seated portion and pressing the molding surface processing control portion in a direction approaching the seated portion; A forming device for a metal material for an automobile capable of correcting forming errors, 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 door impact 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 door impact member; A forming device for a metal material for an automobile capable of correcting forming errors, characterized by including an elastic member interposed between the inner end of the moving plate and the outer end of the seating portion, which applies an elastic force so that the moving plate returns 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 forming device for a metal material for an automobile capable of correcting forming errors, further comprising a pressurizing guide including a rotating shaft rotatably installed on both opposing inner sides in the width direction of the pressurizing 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 characteristic measurement step for measuring the material characteristics of a door impact member pre-formed through a press; A first forming error correction step for predicting the forming pressure and forming conditions of an automobile metal material forming device for forming the door impact member based on the material characteristics of the door impact member measured in the above material characteristic measurement step; A first press forming step of feeding the door impact member into a press forming device and first forming the door impact 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 door impact member formed through the above first press forming step; A second forming error correction step for analyzing the shape of the door impact 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 correcting forming errors, characterized by including a second press forming step in which the door impact member is reintroduced into the metal material forming device for an automobile and the door impact 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

Press forming apparatus of door impact member for vehicle and press forming method thereof capable of correcting forming errors 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 correcting forming errors, which can significantly reduce the defect rate of the finally manufactured door impact member by predicting the forming pressure and forming conditions of the metal material forming apparatus based on the material characteristics, springback displacement amount, and type of the door impact member formed from an ultra-high-strength steel plate through a press, and correcting the forming error. 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 in the vehicle body frame, in order to improve the safety performance and reduce weight of the vehicle. Meanwhile, the seat cross member within the vehicle body frame is installed along the longitudinal direction of the body between the outer and inner panels of the side door. It functions to protect occupants by absorbing and mitigating impact during a side collision and preventing the door from entering the cabin, making it a critical element directly related to safety in the event of an accident. These door impact members (seat cross members) are typically formed using a press; however, press forming entails many limitations regarding the shape of the product to be formed, the thickness of the material, and the forming process for materials such as ultra-high-strength steel. In other words, when manufacturing a 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 causing frequent forming defects. In particular, in the case of conventional press forming devices for forming seat cross members as described above, there was a problem in that it was not possible to compensate for springback even if it occurred after forming the door impact member, or to change the forming conditions of the press according to the degree of deformation of the springback. Therefore, there is an urgent need for a press forming device and a forming method capable of compensating for springback even if it occurs after forming the door impact 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 an automobile door impact member formed through an automobile metal material forming device according to one embodiment of the present invention. FIG. 2 is a drawing for explaining the springback occurrence area of an automobile door impact member, 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 an automobile door impact member formed through an automobile metal material forming device according to one embodiment of the present invention, and FIG. 2 is a drawing for explaining the springback occurrence area of