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KR-20260067481-A - SYSTEM AND METHOD FOR MANUFACTURING A TRAILING ARM TO WHICH A CRACK PREVENTION METHOD IS APPLIED

KR20260067481AKR 20260067481 AKR20260067481 AKR 20260067481AKR-20260067481-A

Abstract

The present invention relates to a system and method for manufacturing a trailing arm with a crack prevention method, comprising: a primary piercing section for piercing a fillet hole in a material for a trailing arm; a foam molding section for foam molding the material for a trailing arm; a secondary piercing section for piercing a fillet hole a second time; an end mill cutting section for cutting the inner surface of the secondary pierced fillet hole; and a burring section for forming a flange by burring the processed surface of the fillet hole in one direction.

Inventors

  • 이재우

Assignees

  • 서진산업 주식회사

Dates

Publication Date
20260513
Application Date
20241105

Claims (6)

  1. In a trailing arm manufacturing system with a crack prevention method applied to a spin end mill press die, A primary piercing section (110) for piercing a fillet hole in a material for a trailing arm; A foam forming section (120) for foam forming the material for the trailing arm in which the fillet hole is pierced; A secondary piercing process (130) for secondary piercing the fillet hole of the foam-molded material for the trailing arm; An end mill cutting advance section (140) for cutting the inner surface of the fillet hole that has been pierced twice; and A trailing arm manufacturing system for preventing crack formation, characterized by including a burring process section (150) that forms a flange having a preset height by burring the processing surface of the fillet hole, which has one side cut, in one direction.
  2. In Article 1, A trailing arm manufacturing system with a crack prevention method, characterized in that the second piercing section (130) performs a second piercing larger than the diameter of the fillet hole formed through the first piercing section (110), while leaving a buffer area with a diameter smaller than a preset reference diameter.
  3. In Article 2, The above end mill cutting progress section (140) is, A rack gear module (141) installed vertically on the lower die of the spin end mill press mold; A pinion gear module (142) that is installed on the upper die of the spin end mill press mold and is engaged with the rack gear module (141) to rotate in a vertical direction during the vertical movement of the upper die; A direction change gear module (143) installed to be rotatable in the upper die of the spin end mill press mold and engaged with the pinion gear to rotate in the horizontal direction when the pinion gear rotates in the vertical direction; and The end mill means (144) is installed to be rotatable in a horizontal direction in the upper die of the spin end mill press mold and is engaged with the direction change gear module (143) to rotate in correspondence with the rotation of the direction change gear module (143) to cut the inner surface of the fillet hole; A trailing arm manufacturing system with a crack prevention method, characterized in that the vertical movement of the upper die of the spin end mill press mold is converted into the rotational movement of the end mill means (144) to proceed with end mill processing.
  4. In Paragraph 3, A trailing arm manufacturing system with a crack prevention method, characterized in that the above end mill means (144) cuts the clearance area through rotational movement during the vertical movement of the upper die of the spin end mill press mold so that the diameter of the fillet hole reaches the reference diameter.
  5. In Article 2, A trailing arm manufacturing system for preventing crack formation, characterized in that the above clearance area has a diameter 0.4 to 0.6 phi smaller than the above reference diameter.
  6. In a method for manufacturing a trailing arm with a crack prevention method applied to a spin end mill press mold, A step of first piercing a fillet hole in the trailing arm material through the first piercing process section; A step of foam-forming the material for the trailing arm, in which the fillet hole is pierced, through a foam-forming process section; A step of secondarily piercing the fillet hole of the foam-molded material for the trailing arm through a second piercing process section; A step of machining the inner surface of the secondary pierced fillet hole through an end mill cutting advance section; and A method for manufacturing a trailing arm with a crack prevention method, characterized by including the step of forming a flange having a preset height by burring the processing surface of the fillet hole, which has one side cut, in one direction through a burring process.

Description

System and Method for Manufacturing a Trailing Arm with a Crack Prevention Method The present invention relates to a system and method for manufacturing a trailing arm with a crack prevention method. More specifically, it relates to a system and method for manufacturing a trailing arm with a crack prevention method that converts the vertical motion of a press mold into rotational motion using a press mold and a tapping driver, thereby removing all fracture surfaces through end mill cutting after piercing, so that a good product without cracks is produced during burring forming. Generally, for vehicle trailing arm components, piercing is performed prior to burring, followed by the formation of a flange through burring. For example, to produce a trailing arm component, fillet holes are first pierced in the material for the trailing arm, and the thickness reduction rate is lowered through foam molding. Subsequently, additional piercing with a larger diameter is performed, and the flange is formed through burring. At this time, due to the high tensile force of the trailing arm component during the burring forming process, cracks intermittently occur on the fracture surface, frequently resulting in the product being scrapped. In particular, as the material and thickness of the trailing arm are changed to reduce component weight, the rate of defective products caused by cracking is currently very high using conventional methods. Figure 1 is a drawing showing a fracture surface crack that occurs during a conventional trailing arm forming process. FIG. 2 is a schematic diagram showing the overall configuration of a trailing arm manufacturing system (100) with a crack prevention method according to one embodiment of the present invention. FIG. 3 is a schematic diagram showing the overall configuration of a spin end mill press mold to which an end mill cutting progressing section (140) according to one embodiment of the present invention is applied. FIG. 4 is a flowchart showing a method for manufacturing a trailing arm with a crack prevention method applied to a spin end mill press mold according to one embodiment of the present invention in a series of sequences. Hereinafter, specific details for implementing the present invention will be described in detail with reference to the attached drawings. However, in the following description, specific descriptions regarding widely known functions or configurations will be omitted if there is a risk that the gist of the present invention may be unnecessarily obscured. In the attached drawings, identical or corresponding components are given the same reference numerals. Additionally, in the description of the following embodiments, the description of identical or corresponding components may be omitted. However, even if a description of a component is omitted, it is not intended that such component is not included in any embodiment. The advantages and features of the invented embodiments and the methods for achieving them will become clear by referring to the embodiments described below together with the accompanying drawings. However, the present invention is not limited to the embodiments described below but can be implemented in various different forms, and these embodiments are provided merely to make the present invention complete and to fully inform a person skilled in the art of the scope of the invention. The terms used in this specification will be briefly explained, and the invented embodiments will be described in detail. The terms used in this specification have been selected to be as generally used as possible, taking into account their functions in the present invention; however, these terms may vary depending on the intent of those skilled in the relevant field, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in this invention should be defined not merely by their names, but based on the meanings they possess and the content of the invention as a whole. In this specification, singular expressions include plural expressions unless the context clearly specifies them as singular. Additionally, plural expressions include singular expressions unless the context clearly specifies them as plural. Throughout the specification, when a part is described as including a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Figure 1 is a diagram showing a fracture surface crack that occurs during a conventional trailing arm forming process. Looking at Figure 1, in order to produce a trailing arm part, a fillet hole is first pierced in the material for the trailing arm, and after reducing the thickness reduction rate through foam molding, an additional pierc