Papers by Keyword: Drawing Die

Abstract: The main motivation in stamping die industry and academia is panel quality and formability issues rather than the weight and cost of the die. A product should be designed according to the loads that it can be faced in service condition. But somehow this rule is not valid for stamping die design since the minimum distance between the ribs is based on the standards and location and pattern of the ribs which are depending primarily on the company experience. In this work, an auto panel drawing die design is investigated numerically whether it is overdesigned or not. The loads on the die surfaces are calculated by numerical methods. When a panel is drawn between upper and lower die, the contact pressure (CP) occurs on the interface surfaces due to this interaction. Since CP is a vital parameter and it is almost impossible to measure it by experimental methods, it is validated by two different numerical codes. The CP values obtained from Autoform^® quasi-static solution are compared with Abaqus^® transient forming analysis solution. Topology optimization is applied on the lower die by using the estimated CP loads. Von-Mises stress, elastic deformation and volume are compared between current and optimized die geometry. Panel thickness variation is also investigated in longitudinal and transverse directions.

Abstract: In this paper, the drawing die of cemented carbide WC-Co (Wolfram Carbide-Cobalt) was taken as the substrate which was preprocessed by Murakami solution and aqua regia. DCS (Direct Current Magnetron Sputtering) was adopted to sputter the Nb interlayer in the bore of the drawing die. By using EACVD (Electron Assisted Chemical Vapor Deposition), micro-nanocomposite coating was deposited. Then, specimens were characterized through methods like SEM (scanning electron microscope) and Raman etc. Results indicated that the drawing die showed very smooth coating surface and a compact, uniform structure; the grain size < 50 nm and surface roughness < 10 nm. It can be inferred from the indentation experiment that there was satisfactory adhesion force between coating and the substrate. So, the drawing die can satisfy the working requirement of drawing wires.

Abstract: In the field of mechanical installation and repairing, drawing devices are often used to disassemble or push up components of various types of axie and set. Differential thread usually consists of two sets of threads, which differ in the aspect of side pitch, the movement distance of differential thread when it runs a circle should be the deviation of the two spiral side pitches. Through the application of differential thread, it enables us to make changes in the transmission of these two screw pairs making relative movement. Based on this principle, when it is made into the application of manual drawing device, it optimized structure of drawing device, receiving a better result.

Abstract: Automobile panels have the characteristics of thin material,complex shape,large structure and size and high-quality requirements on surface,so the workblank deformation is also very complicated in the process of forming, and it is vulnerable to forming defects such as wrinkling and cracking and so forth. Based on Dynaform, a method of parameterized design for automobile panels is discussed here, which includes the designs of stamping direction, addendum surface, binder surface and draw bead. The simulation and analysis on forming process of automobile panels provides a basis for completing modular surface design. Obviously, the results show that the simulation on forming process of automobile panels by Dynaform software shortens the mold development time and mold tryout cycle and lowers cost.

Abstract: Drawing devices, as an important auxiliary equipment, nowadays widely applied in areas such as mechanical installation, machinery manufacturing, machinery repair, but still have problems to fit into the workpiece of larger size and of difform shape. The article presents a new kind of drawing device with a novel drawing die,which not only well solve the problem mentioned but also greatly improve the use efficiency and the use value by analyzing the existing deficiency in drawing devices.

Abstract: According to characters of auto covering parts such as large size, thin thickness, complexity in shape, low degree of standardization and expressed by model, etc. This paper put forward the drawing die design process of auto covering parts based on NX software. The assembly drawing of the auto covering part drawing die was shown in detail. In accordance to the mold design process, the digitized model was parametrically designed. The competitiveness of the auto covering part mold manufacturing enterprises was significantly improved with the application of 3D mold dynamic simulation s and automatic forming line simulation.

Abstract: The cold-roll-formed profiles usually defects such as bow, camber, twist, edge wave, corner buckling as well as edge cracking, and splitting. Straightening is used as the later part of working procedure in order to eliminate these defects and improve the quality of the final profile. A drawing straightening machine is designed to achieve the purposes of the U-shaped steel straightening. In the design coefficient of friction, forming speed, roll speed, methods to minimize defects.

Abstract: Taking a company’s automotive panel drawing die as an example, this paper numerically simulates the process of drawing forming based on finite element analysis (FEA) software ANSYS, the design rationality of die structure is analyzed combining distribution characteristics of stress and strain, the paper also proposes feasible improvment measures according simulation analysis to optimize the structure of drawing die. The study result shows that analysis results based on ANSYS can forecast defect and failure regions in the forming process of automotive panel drawing die, optimize the design of drawing die, prolong the die life effectively, and reduce production cost.

Abstract: In this article, a drawing die is researched in order to obtain the dynamic load and stress distributions and determine the potential fatigue location in it. The stress fields of the drawing die in the drawing process and their changing rules were studied through finite element method. The dynamic simulation of stress changing state has been realized, and the potential fatigue locations in the die were also determined. Based on the conclusion, the cavity die was divided into the substrate part and the wear-resistant part according to the stress distribution. Fatigue life estimations were made on the homogeneous die and the die with bi-materials. The example showed that bi-materials design can increase the service life while greatly reduces the cost of die material. The conclusions drawn conform to reality and have realistic significance.

Abstract: The temperature distribution on interior hole surfaces of drawing dies in HFCVD reaction was analyzed by combining the FEM simulation and related measurements. The analysis showed a parabolic tendency of elevating substrate temperatures and a moderating tendency of corresponding temperature gradients while enlarging hot-filament radius. The optimization of the hot-filament radius for a sized drawing die to achieve a comfortable substrate temperature distribution for depositing superior diamond films was conducted and safely supported by related experiments. SEM was used to observe the morphology of diamond films. The simulation is of practical significance for improving the deposition of diamond films in HFCVD reaction.