What are the characteristics of the plucking process? What are the characteristics of wire drawing p

1. Anti-tension drawing is a processing method that pulls the blank in the opposite direction at the back end of the drawing die during drawing, which greatly reduces the wear of the drawing die and reduces the phenomenon of drawing wire or profile being pulled off. 2. Roll die drawing It is a production process that combines drawing and rolling, that is, replacing the traditional hole die with a hole-shaped roll, turning most of the sliding friction into rolling friction, greatly reducing the friction resistance, and realizing high-speed drawing. 3. Forced lubrication and drawing is to install a slender pressurized conduit or pressurized die at the front end of the drawing die, and with the help of the viscosity of the moving blank and lubricant during drawing, the high-viscosity lubricating oil is brought into the drawing die, forcing the lubricant to enter the die hole, and a layer of lubricating film is formed between the blank and the drawing die, thus producing a hydrodynamic effect and reducing the effect of friction.

4. Moldless drawing It is a flexible plastic processing technology that does not use traditional drawing dies and relies on the properties of metal deformation resistance with temperature change, which is a method of processing using the heating and cooling control of cold and heat sources. It solves the problems of many drawing passes, small deformation and low production efficiency in traditional drawing, but the uniformity of the finished product is poor, and the product quality is unstable. 5. Others, such as ultrasonic vibration drawing, superplastic drawing, etc., which apply ultrasonic vibration on the drawing die.

Drawing is a plastic processing method that uses external force to act on the front end of the drawn metal to pull the metal blank out of the die hole smaller than the blank section to obtain the corresponding shape and size of the product. In metal drawing or drawing, sheet metal or blank is drawn by means of a drawing punch. The punch is fed into the die and the sheet metal is formed.

Usually cylindrical or box-shaped pieces are formed by drawing or deep-drawing, such as beverage cans, barrels, butterfly pieces, and other containers and mobile phone shells of various shapes and sizes. The following is a brief introduction to the characteristics of the drawing process:

1. Application range of metal drawing production:

Metal wires, thin pipes, including some profiles can be produced by drawing processing.

Generally, hot-rolled wire rod is small in diameter. If it is less than this diameter, it will cool quickly during the rolling process, and the plastic conditions will deteriorate; At the same time, the friction between the roll and the metal increases due to the tight wrapping of the iron oxide sheet generated on the surface. Therefore, when the diameter is small, the rolling method cannot be continued, but the rolled wire rod is used as raw material, and the steel wire is obtained by the method of cold drawing many times.

Drawing products include coiled wires and thin pipes; There are also straight products, such as round, hexagonal, square profiles, profiles, and slightly thicker pipes of various cross-sectional sizes.

2. The metal drawing processing method has the following characteristics:

1) The drawing method can produce products with very large length and small diameter, and can ensure that the cross section is completely consistent along the entire length;

2) The shape and size of the drawing products are accurate, and the surface is accurate. The dimensional accuracy is plus or minus a few hundredths of a millimeter, and the surface characteristics of the surface roughness are as good as those of the aurora surface.

3) High mechanical strength of drawing products;

4) The disadvantages of the drawing method are that the processing rate of each pass is smaller, the number of pulling passes is more, and the energy consumption is larger.

1. Drawing of solid section products.

Drawn from solid cross-section blanks into wires of various specifications and shapes. Among them, the process of drawing round section wire is the simplest, which is called simple drawing process.

Second, the drawing of hollow section products.

Pipes of various specifications and shapes are drawn from hollow section blanks. There are several basic methods for pipe drawing.

1) When the coreless empty drawing is drawn, the core head is not placed inside the tube blank, and the outer diameter is reduced after passing through the mold, and the pipe wall will generally change slightly.

2) The long core rod draws the pipe with a long core skewer, and the core rod passes through the mold with the arm blank during the stretching process to achieve diameter reduction and wall reduction.

3) Short core head drawing: This method is the most widely used in pipe drawing. When drawing, the core skewer with a short core head is fixed, and the tube blank is reduced by the die hole to achieve diameter and wall reduction.

4) When the swimming core head is drawn and drawn, the force balance established by the unique shape of the core head makes it stable in the deformation zone, and forms a certain size of annular gap with the transverse hole. This method is more advanced and is very suitable for small tubes with large lengths and can be rolled into rolls.

5) The pipe jacking method will be used to put the core into the tube blank with the bottom, and the tube blank will be ejected from the die hole together with the core rod during operation, so as to process the size of the outer diameter and inner diameter of the pipe blank.

6) After the pipe blank is expanded, the diameter increases, and the wall thickness and length decrease. This method is used to produce large diameter tubes from small diameter tube blanks to relieve the constraint of not being able to produce large diameter tube blanks.

The drawing process is generally carried out in a cold state, but for some metal materials with high strength and poor plasticity at room temperature, such as some steel grades and plating, molybdenum, tungsten, etc., warm drawing or hot drawing is used.

Cold drawing is a processing technology of materials, for metal materials, cold drawing refers to the drawing of materials at room temperature in order to achieve a certain shape and certain mechanical properties. Compared with hot forming, cold-drawn products have the advantages of high dimensional accuracy and good surface finish.

Cold drawing is the most common drawing method used in the production of metal wire and wire.

Ultrasonic machining has the following characteristics:

1) It is mainly suitable for processing all kinds of non-conductive hard and brittle materials, such as ceramics, glass, quartz, gemstones, agate, diamond, etc. Electrically conductive cemented carbide and hardened steel can also be processed, but the efficiency is very low.

2) Because the relative movement between the tool and the workpiece is relatively simple in the processing process, it is easy to process the inner surface and forming surface of various complex shapes. With the hollow shape tool, it is also possible to realize nesting in various shapes.

3) In the process of processing, the macroscopic force of the tool on the processed material is small, the cutting heat is smaller, and there will be no deformation and surface burns, so it is especially suitable for processing some thin-walled, narrow-slit and low-stiffness parts that cannot withstand greater mechanical stress.

4) Because the crushing of the material depends on the direct action of the abrasive, the hardness of the tool material can be lower than the hardness of the processed material, and the hardness of the abrasive should generally be higher than that of the processed material. Medium carbon steel and a variety of formed tubes and wires are often used as tools.

At present, in various industrial sectors, ultrasonic machining is mainly used for hole processing, nesting, cutting, engraving and grinding of diamond drawing dies of hard and brittle materials. Figure 5-47 shows an example of an ultrasonic machining application. However, the area of ultrasonic machining is small, and the wear of the tool head is large, so productivity is low.

Generally, the hole diameter range of ultrasonic machining is about, and the depth can reach more than 100mm, and the size error of the processed hole is less than (.

Figure 5-47 Example of ultrasonic machining application.