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Metal working process
- May 25, 2018 -

Metal processing refers to the production activities of processing materials with metal characteristics composed of metal elements or metal elements. Processing methods and processes of metals include: [3]

casting

Casting: the metal is heated and melted, then poured into the model, suitable for processing complex parts.

Pouring classification

Sand mold casting: low cost, small batch, can process complex modeling, but may require a large number of post-processing procedures.

Investment casting/wax loss casting: this process has high continuity and precision and can also be used for complex molding. It can achieve perfect surface effect under the premise of relatively low processing cost and is suitable for mass production.

Injection casting: used to process complex shapes with high error. Due to the characteristics of the process itself, there is no need for post-processing after the product is formed. However, only in mass production can the advantages of low cost be shown. Die casting method: high processing cost, only in the case of mass production cost is reasonable. But the final product cost is relatively low and the error is high. Can be used in the production of thick thin wall parts. [4]

Spinning casting: ideal for processing small parts, usually used in jewelry manufacturing. Rubber models can be used to reduce the cost of processing.

Directional solidification, the machine can produce good fatigue resistance performance of the very strong heat-resistant alloy pouring into the model, and then through strict control of heating and cooling process, to eliminate any small flaws Plastic forming part of the plastic forming: refers to the forming of metal heating with to modelling, belongs to the labor-intensive production. [3]

Plastic forming

Forging: it is one of the simplest and oldest metal modeling techniques to shape metal by beating and squeezing under cold or high temperature working conditions. [3]

Tie-in: the high temperature metal billet section passes through a number of continuous cylindrical rollers, which insert metal into the mold to obtain the preset shape.

Wire drawing: the process of drawing metal strips into fine filaments using a series of drawing dies with decreasing specifications.

Extrusion: a low cost, continuous processing, solid or hollow metal forming process with the same cross section shape, capable of both high temperature operation and cold processing.

Impact extrusion: the process of processing small to medium sized parts without taper requirements. Fast production, can process all kinds of thick wall parts, low processing cost.

Powder metallurgy: a process that can be used to process ferrous or non-ferrous metal elements. This includes mixing the alloy powder and pressing the mixture into the mold. Metal particles are sintered at high temperature. This process does not require machine processing, the raw material utilization rate can reach 97%, different metal powder can be used to fill different parts of the mold.

Solid forming

Solid forming processing: refers to the use of raw materials in normal temperature conditions can be shaped metal strips, pieces and other solid form. It is labor-intensive. Processing costs can be relatively low.

Solid forming process classification

Spinning: a very common process used to produce round symmetrical parts, such as dishes, cups, and cones. During processing, the high-speed rotating metal plate is pushed close to the rotating, fixed lathe model to obtain the preset shape. This process is suitable for all kinds of mass production. [3]

Bending: an economical process used to process sheet, rod, and tubular materials of any form.

Continuous tie-forming: feed the metal sheet into the press roller to obtain the metal shape with continuous length and consistent cross section. Similar to the extrusion process, however, the wall thickness of the processing element is limited, and only a single wall thickness can be obtained. Only under the premise of mass production, the processing cost is most reasonable.

Stamping and forming: the metal sheet is pressed between the positive die and the negative die. It is used for processing hollow shape.

Punch hole: use special tools to punch and cut a certain shape on the metal sheet of the process, large and small batch production can be applicable.

Punching and cutting: it is basically similar to the punching process, except that the former USES the punching part, while the latter USES the remaining part of the metal sheet after punching and cutting.

Cut: cutting a sheet of metal by cutting it is the same as cutting paper from the best position with a pair of scissors.

Chip forming: when cutting metal, the cutting methods of chip production are collectively referred to as chip forming, including milling, drilling, lathe processing and grinding, saw and other processes.

Chip free molding: use existing metal strips or sheet metal to shape. No chip is produced. Such processes include chemical processing, corrosion, discharge machining, sand blasting, laser cutting, water jet cutting and hot cutting.

Wire drawing

Drawing wire can be made into straight, irregular, threaded, corrugated and spiral lines according to decoration needs.

Straight grain drawing refers to the machining of straight lines on the surface of aluminum plate by means of mechanical friction. Straight line wire drawing has two kinds of continuous silking and intermittent silking, continuous silking available microfiber cloth or stainless steel brush through continuous straight and level of aluminum plate surface friction (e.g., under the condition of device have by now manual skills or use the planer grinding clamp wire brush brush on the aluminum sheet mill). Change the diameter of stainless steel brush steel wire, can obtain different thickness of fine lines. Interrupted silks are usually made by processing in the machine or machine.

Preparing principle: the two groups of synthetic differential wheel rotation, the group to rapidly spinning roller, the slow rotation of the group under the conditions of the rubber roller, aluminum or aluminum alloy passed between two groups of the roller, brush an intermittent straight lines.

The striated drawing is a kind of irregular and non-obvious striated silks obtained by moving the aluminum plate from left to right and moving forward under the high-speed copper wire brush. This kind of processing, aluminum or aluminum plate surface requirements are high.

Corrugation is usually made on a brush or a striping machine. Using the axial movement of the upper set of grinding rollers, the surface of aluminum or aluminum alloy plate is brushed to obtain the wavy pattern.

Wen also called optical, is to use a cylindrical felt or nylon wheel to grind stone on the drilling machine, kerosene and polishing ointment, rotate surface of aluminum or aluminum alloy sheet mill acquired a silking. It is used for decorative processing of circular signs and small decorative dial.

Thread is to use a on the shaft with a circular, felt the small motor should be fixed on the surface of the table, edge of about 60 degree Angle with the table, in addition to be a drag plate with fixed aluminum plate pressure tea, dragging plate with one edge neat straight threads polyester film used to restrict the competition degree. Using the rotation of the felt and the straight line movement of the towing plate, the same width of the thread line on the surface of the aluminum plate is wiped out. Characteristics of plastic electroplating plastic electroplating plastic electroplating products have the characteristics of both plastic and metal. It has a small proportion, good corrosion resistance, easy forming, metallic luster and metal texture, as well as conductive, magnetic and welding properties. It can save complex machining process, save metal materials, and beautiful, decorative strong, it also increased the mechanical strength of plastic. Because the metal coating has high stability to external factors such as light and atmosphere, it can prevent plastic aging and extend the service life of plastic parts after plastic plating. With the rapid development of industry and the wide application of plastic plating, it has become one of the important means of surface decoration in plastic products. At home and abroad has been widely in ABS, pp, polysulfone, polycarbonate, nylon, phenolic glass fiber reinforced plastic, polystyrene plastics, such as the plating on the surface, especially in ABS plastic plating, the most widely used plating effect is best. [3]