Metal Stamping Process Requirements

  • Metal Stamping Parts materials and choices
    The performance of stamping materials is closely related to stamping production, which directly affects stamping process design, stamping part quality and product replacement, and also affects the organization of balanced production and the part of stamping production costs.
    When selecting the material of the stamped part, it is necessary to consider both the service performance and the requirements of stamping processing and subsequent process performance. The basic requirements of the stamping process are as follows.
    1. Good stamping performance.
    For stretching, bending, poor punching, convex hulls and other forming processes, the material should have good stamping properties, that is, good fracture resistance, good mold adhesion and formability, otherwise the product is easily deformed, cracked, etc. Mold repair is difficult. For the separation process, the material is required to have a certain plasticity.
    2. High surface quality.
    The surface of the material should be smooth and free of defects. Materials with good surface quality are not easy to crack and scratch the mold, and the surface quality of the parts is also good.
    3. Material thickness tolerances should conform to national standards.
    Since a certain mold clearance is only suitable for a certain thickness range of material, if the material thickness tolerance is too large, it will directly affect the quality of the part and may also lead to waste. In the correction of bending, forming and other processes, damage to the mold or press due to excessive thickness deviations may occur.
    Stamping materials and choices
    1.Commonly used stamping materials
    The most common materials used in stamping production are metallic materials (including ferrous and non-ferrous metals), but sometimes non-metallic materials are also used. Among them, ferrous metals mainly include ordinary carbon structural steel, high-quality carbon structural steel, alloy structural steel, carbon non-ferrous metals mainly include pure copper, brass, bronze, aluminum, etc .; non-metal materials include cardboard, expansion boards, rubber plates, Plastic board, fiberboard and mica.
    Sheet metal can be used for the production of engineering molds, and strips (rolls) can be used for the production of continuous molds, as well as the production of engineering molds. The supply state of metal materials for stamping is usually sheets and strips of various specifications. Sheet metal dimensions can be cut into strips according to the layout size, which can be used for stamping large parts, and for stamping small and medium parts. The strip material (also known as coil) has various sizes and widths, and the unrolled length can reach tens of meters. It is supplied in a coil shape and is suitable for automatic feeding of continuous mold batch production.
    For the grades, specifications and performance of various materials, you can refer to the relevant manuals and standards.
    2. Reasonable selection of stamping materials.
    The selection of stamping materials should consider the requirements of stamped parts, stamping process requirements and economy.
    (1) Reasonably select according to the requirements of stamping parts.
    Therefore, according to the use conditions of the stamping parts, the replacement material should meet the corresponding requirements of strength, stiffness, allowance, corrosion resistance and heat resistance.
    (2) Reasonably select materials according to the requirements of the stamping process.
    For any kind of stamping parts, the substitute material should be able to form a qualified product stably according to the requirements of the stamping process. This is the most basic and important material selection requirement. Therefore, the following methods can be used to select materials reasonably.
    (1) Test. According to past production experience and possible conditions, select several plates that can basically meet the requirements of stamping parts for blanking. Finally, choose products that have no cracks or wrinkles and low scrap rates. This method is more intuitive, but blind fractures.
    (2) Analysis and comparison. Based on the analysis of stamping deformation performance, the maximum deformation degree in the stamping process is compared with the allowable limit deformation degree of sheet metal stamping forming performance, and a sheet metal suitable for the stamping process requirements of such parts is selected.
    In the domestic plate, the thick plate (t> 4mm) is a hot-rolled plate, and the thin plate (t <4mm) is a cold-rolled plate (also a hot-rolled plate). In addition, steel plates of the same brand or same thickness, and cold-rolled and hot-rolled point. ). Compared with hot-rolled sheet, cold-rolled sheet is accurate in size and small in deviation.
    (Note: t usually represents the thickness of the mold, such as the thickness of the template, and the thickness of the material can be represented by T.)
    (3) Choose reasonably according to economic requirements.
    The selected materials should be adjusted on the premise of meeting the performance requirements and stamping process requirements with low, convenient sources and good economics to reduce the cost of stamped parts.