With the development of NC stamping equipment, sheet metal stamping process is developing in a diversified direction. The punching-shearing composite process has opened up a new field, which is especially suitable for meeting the flexible requirements of small and medium batches. Punching-shearing composite process is a process that can obtain high surface roughness and high precision by one stamping stroke. It is widely used in aviation, aerospace, automobile, machinery, shipbuilding, household appliances and so on. Following is a brief introduction to the manufacturing process of stamping hardware workpiece in Baida Borun Petrochemical Company.
Stamping parts
I. Design of Stamping Parts
(1) The results of the design and implementation of stamping parts are three-dimensional entities with related concepts such as color, material, hardness, shape, size, location, related parts, manufacturing process and so on.
(2) The emergence of computer technology directly starts with the concept of three-dimensional design, which can more intuitively and accurately express all the geometric parameters of the design concept, and the whole design process can be fully discussed on the three-dimensional model.
(3) Computer technology can help stamping engineers rationalize the design process from the viewpoint of design and manufacturing, and gradually create stamping parts from the generation of sheet metal and the completion of each process.
(4) It can be seen as a virtual environment for stamping parts. Engineers can design and assemble parts directly on the computer screen. The virtual manufacturing process is almost the same as the real one.
(5) After the design of a single stamping part is completed, the three-dimensional models of multiple parts can be simulated and assembled, thus greatly shortening the design and cycle.
2. Deployment of stamping parts
After the design of stamping parts is completed, in order to facilitate manufacturing, it must be converted into an expansion drawing to determine the size of the required sheet and the shape of the sheet. (1) Computer-aided design has a small amount of operation, and the development process is completely controlled by computer.
(2) Computer aided design (CAD) has high efficiency and avoids errors that are easy to make for engineers when deploying.
(3) Computer-aided design (CAD) has high precision, and the unfolding data are completely computed by computer, thus avoiding the large grain cost of materials.
3. Selection of Stamping Oil Products
Stamping oil plays a key role in the stamping process. Good cooling performance and extreme pressure and anti-wear performance have made a qualitative leap in improving the service life of the die and the accuracy of the workpiece. Matching should be made according to the material of the workpiece.
(1) When choosing punching oil for carbon steel sheet, the better viscosity should be determined according to the process difficulty and degreasing conditions.
(2) Because of chemical reactions with chlorine additives, attention should be paid to the possibility of white rust in chlorine-type stamping oil for galvanized steel sheets when choosing stamping oil, while the rust problem can be avoided by using Yida Borun sulfur-type stamping oil, but the degreasing should be done as soon as possible after stamping.
(3) Stainless steel is a kind of material which is easy to harden. It is required to use drawing oil with high film strength and good sintering resistance. Pressing oil containing sulfur and chlorine compound additives is generally used to ensure extreme pressure performance and avoid burrs and cracks on the workpiece.
IV. Blanking of Stamping Plate
(1) Cutting of shear machine is to use the shear machine to cut out the shape, length and width of the unfolding drawing. If there is punching and cutting angle, then turn the punch press to combine with punching and cutting angle forming of the die.
(2) The blanking of punch is to punch the flat plate structure with the parts unfolded by the punch in one or more steps. Its advantage is short time-consuming and high efficiency, which is often used in batch manufacturing.
(3) NC programming is the first step in NC blanking. The unfolding drawings are compiled into identifiable contents of NC machine tools, so that they can be stamped out step by step according to these contents.
(4) Laser blanking is the use of laser cutting method, in a plate to cut out the shape of its plate structure.
5. Blanking of Machine Tool Plates
In order to meet the requirements of each process, the corresponding die is needed to complete the operation, such as the punch die, the tear forming die and so on.
6. Tapping and riveting of plate parts
Flanging is to draw a slightly larger hole into a smaller base hole and tap on it. This will increase the strength and avoid slippery teeth. Pressure riveting studs, riveting nuts, riveting screw and so on are often used in riveting. The riveting method is usually completed by punching machine or hydraulic riveting machine, which is riveted to the stamping parts.
7. Stereo Bending of Plates
Bending is a part that bends a flat plate into a body. It needs a bending machine and a corresponding bending die to complete the operation. It also has a certain order of bending, its principle is that the next knife does not interfere with the first fold, will interfere with the back fold.
VIII. Surface Treatment of Workpieces
Surface treatment generally includes phosphating skin film, electroplating multicolor zinc, chromate, baking paint, oxidation and so on. Phosphating coating is generally used for cold rolled sheets and electrolytic sheets. Its main function is to prevent oxidation by coating a protective film on the surface of the sheets; cold rolled sheets are generally used for electroplating multicolor zinc; chromate and oxidation are generally used for surface treatment of aluminium sheets and aluminium profiles.
Above is the manufacturing process of metal stamping parts. Precision metal stamping technology needs to know the parameters of machine tools and machine tools sufficiently. According to the process characteristics of CNC punch, a comprehensive analysis is made to make CNC punch get reasonable application and full play. Yida Borun is the largest production base of high-end metal processing oil in China. The independently developed stamping oil products have excellent extreme pressure and anti-wear properties.
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