company news about Die design for stamping molds

I. Summary of Pressing Mold Design Content

    This paper covers the concept, characteristics, applications, basic processes and mold types of stamping. It analyzes the current situation and development direction of stamping technology, including forming theory, mold design and manufacturing, equipment automation, standardization, etc. At the same time, a process analysis was conducted for a specific part (material H62, thickness 4mm, medium batch production), and the progressive stamping process was determined. The layout design, calculation of stamping force and pressure center, and calculation of the size of the cutting edge of the punch and die were completed for the mold design. It also included the processing technology of mold parts and the verification of the press machine.

 1.Key points of the stamping foundation

        Pressing is a manufacturing technique that uses a press machine and molds to apply pressure to materials, causing them to separate or undergo plastic deformation to obtain the shape of parts. The common forms are cold pressing or sheet metal pressing. It has significant advantages, including high production efficiency, with ordinary presses capable of performing dozens of operations per minute, and high-speed presses capable of hundreds or even thousands of operations per minute; stable quality, as the molds can ensure dimensional accuracy and shape, without damaging the surface and have a long lifespan; it can process a wide range of sizes and complex shapes of parts, with excellent strength and rigidity, and can also save materials and energy. However, pressing relies on specialized molds, and complex parts require multiple sets of molds. Pressing is widely used in industries such as automobiles and electronics, and the basic processes cover separation, forming, and combination. The molds are divided into various types according to the nature of the process and the combination method, and are composed of upper and lower molds.

  2.Development Trends of Pressing Technology

        In the field of stamping forming theory and technology, finite element simulation technology is used to predict processes and optimize designs. New processes such as precision stamping and soft mold forming are constantly emerging. The design and manufacturing of stamping dies are developing towards efficiency, high precision, long service life, and multi-station directions. Modern progressive dies can have more than 50 stations, with a stroke accuracy of 2 micrometers. Simple stamping die technology is also developing simultaneously. Stamping equipment is evolving towards multi-station, multi-functional, high-speed, and numerical control. Flexible manufacturing units and systems achieve unmanned production. In terms of standardization and specialized production, the standardization level in foreign countries reaches 70%-80%, while in China it is approximately 40% or less. The level of standard components needs to be further improved.

3. Practical Application of Part Processing and Mold Design

       Taking a medium-batch production part made of H62 brass with a thickness of 4mm as an example, after process analysis, after adjusting some dimensions, ordinary punching can meet the requirements of precision and surface roughness. The progressive punching process is the most suitable. In the mold design calculation, the utilization rate of the straight row layout material is 65.39%. The punching force, pressure center are determined, and the JD21-80 press machine is selected. The cutting edges of the concave and convex dies are designed according to different benchmarks for blanking and punching. The key parts of the mold, such as the concave die, convex die, and stripper plate, have clear dimensions and materials to ensure the requirements of strength and stiffness.