Knowledge of processing metal stamping parts
Processing metal stamping parts is one of the important processes in the production of hardware manufacturing enterprises, which includes punching, cutting, blanking and bending. The processing quality of stamping parts directly affects the performance of products. In the production of metal stamping parts, mold method and process method are mainly used for processing. The following are introduced respectively:
1. Mold method;
(1) Type of mold;
According to different uses, it can be divided into general, special and combined types.
(2) Die structure;
According to the different nature of work, it can be divided into two types: integral type and combined type. The combined type is composed of several stamping dies; Consisting of an integral die and the convex and concave parts of one or more parts; integral; There is also a semi assembled stamping processing equipment between the two.
Single stage and multi-stage stamping dies are commonly used. Single stage stamping forgings have higher precision, but their size range is narrow; The precision of two-stage punching forgings is low, but the size range is wide.
(3) Blanking clearance;
In order to ensure the normal deformation of metal materials and obtain the necessary strength and stiffness, a certain clearance value should be guaranteed. When the hardness of the material is high, the gap value should be larger when the tensile ratio and brittleness are large; When the hardness is low, a smaller clearance value should be used.
(4) Convex and concave shape;
In order to facilitate blanking and improve work efficiency, workpieces are often made into blanks of various convex and concave shapes or rough and fine datum planes, such as cylindrical, conical, cylindrical, cone table blanks for deep drawing; Ring, square ring, rectangular strip or square column precision datum planes used for forming
(5) Clamping method;
A variety of clamping tools with different structures can be selected according to the shape, material and production efficiency of the punched parts. The commonly used clamping tools are fixed distance pressing plate and adjustable wrench The advantage of the fixed distance pressing plate is that the position can be adjusted with high accuracy; The advantage of the adjustable wrench is that it is convenient to replace tools with different sizes.
(6) Removal device;
In order to prevent damage or affect work efficiency due to external force, a safe and reliable removal device must be provided. Common removal tools include hydraulic pliers and pneumatic pliers.
The production of metal stamping processing plants is to use presses and molds to exert external forces on plates, strips, pipes and profiles to make them plastic deformation or separation, so as to obtain workpieces of required shape and size. This is stamping processing. The three indispensable things in stamping processing are metal materials, molds and presses.
According to the deformation characteristics of materials, stamping processes can be divided into two categories: separation and plastic deformation.
The separation process means that under the action of external force, the stress in the deformed part of the metal material exceeds the strength limit of the metal material itself and the sheet metal breaks to separate it. Plastic deformation refers to that: under the action of external force, the stress in the deformed part of the metal material exceeds the yield limit of the material itself, but when the strength limit is not reached, only plastic deformation will occur to obtain a certain shape and size.
In stamping processing, stamping deformation can also be divided into five types: three-dimensional pressing, bending, calendering, forming and blanking.
Stamping solid pressing deformation: it is to redistribute the volume and transfer the metal material to change the blank shape or height thickness. Bending deformation: it is to deform the flat material into bending parts, so as to further change the shape of bending parts. There are bends, curls, twists, etc. Calendering deformation: it is to press the flat blank into the desired hollow part, which can also further change the size of the hollow part. Forming deformation: it is to change the shape of the workpiece or blank by using local deformation of various properties. The forming deformation includes undulating forming, flanging, necking, protruding belly, rolling and shaping. Blanking deformation: It refers to the separation of parts of metal materials from other parts without sealing or sealing. Such methods include blanking, punching, trimming, cutting, sectioning, cutting, etc.
Balford progressive die stamping, deep drawing parts manufacturer