Wrinkling during the stamping production of Petrol Car will lead to the scrapping of Roewe Car parts, which not only increases manufacturing costs, but also causes waste of raw materials, which requires analysis and control.
1. The reason is
① The blank holder force is not enough and the gap between the blank holder surfaces is inappropriate, resulting in the problem of "tight and loose".
② There is too much lubricating oil, the machine is brushed too frequently, or the brushing position is improper.
③The test punch blank is too soft, the material strength is low, and the blank size is too small to press the material.
④The positioning of the blank is unstable, resulting in local pressing, inappropriate shape of the pressing surface, and uneven feeding.
⑤The stamping direction of Petrol Car is improper.
2. Measures to control wrinkles
① Check the status of wrinkles. When wrinkles appear evenly around Roewe Car parts, it should be judged that the extrusion force is insufficient and can be eliminated by gradually increasing the extrusion force. When drawing conical and hemispherical Roewe Car parts, it is necessary to increase the tensile stress on the inner diameter of the plate by adding draw beads to eliminate wrinkles. Adopt the principle of "tight inside and loose outside" to eliminate the problem of "loose inside and tight outside".
② For lubricating oil, system oil brushing should be carried out in accordance with the operating procedures to ensure the correct amount and position of oil brushing to avoid causing wrinkles.
③ Without affecting the requirements of the entire vehicle, replace the materials of Roewe Car parts with blanks that are too soft to ensure the quality of Roewe Car parts and avoid wrinkles.
④ Improve the positioning and add a pre-bending process if necessary to ensure that the sheet will not deviate when stamping Roewe Car parts. Modify the shape of the pressing surface to ensure the quality of Roewe Car parts and avoid uneven feeding due to the fixed shape of the pressing surface.
⑤ In view of the improper stamping direction of Petrol Car, simulation software should be used to analyze the stamping process of Petrol Car in the early stage of design to ensure the stamping direction of Roewe Car parts. When the quality of Roewe Car parts is high, the mold needs to be redeveloped and the stamping direction of Petrol Car needs to be adjusted.
Chongqing Yuntu Automobile Trading Co., Ltd.
