Sheet metal forming processes are those in which force is applied to a piece of sheet metal to modify its geometry rather than remove any material. The applied force stresses the metal beyond its yield strength, causing the material to plastically deform, but not to fail. By doing so, the sheet can be bent or stretched into a variety of complex shapes. Sheet metal forming processes include the following:
l Bending
l Roll forming
l Deep Drawing
l Stretch forming
Bending
Bending is a metal forming process in which a force is applied to a piece of sheet metal, causing it to bend at an angle and form the desired shape. A bending operation causes deformation along one axis, but a sequence of several different operations can be performed to create a complex part. Bent parts can be quite small, such as a bracket, such as a large enclosure or chassis.
V bending and Wipe bending
Roll forming
Roll forming, is a metal forming process in which sheet metal is progressively shaped through a series of bending operations. The process is performed on a roll forming line. Each station has a roller, referred to as a roller die, positioned on both sides of the sheet. The shape and size of the roller die may be unique to that station, or several identical roller dies may be used in different positions. The roller dies may be above and below the sheet, along the sides, at an angle, etc. the roller dies are lubricated to reduce friction between the die and the sheet, thus reducing the tool wear. Also, lubricant can allow for a higher production rate, which will also depend on the material thickness, number of roll stations, and radius of each bend. The roll forming line can also include other Sheet Metal Fabrication operations before or after the roll forming, such as punching or shearing.
Deep drawing
Deep drawing is a metal forming process in which sheet metal is stretched into the desired part shape. A tool pushes downward on the sheet metal, forcing it into a die cavity in the shape of the desired part. The tensile forces applied to the sheet cause it to plastically deform into a cup-shaped part. Deep drawn parts are characterized by a depth equal to more than half of the diameter of the part. These parts can have a variety of cross sections with straight, tapered, or even curved walls, but cylindrical or rectangular parts are most common. Deep drawing is most effective with ductile metals, such as aluminum, brass, copper, and mild steel. Examples of parts formed with deep drawing include automotive bodies and fuel tanks, cans, cups, kitchen sinks, and pots and pans
Stretch Forming
Stretch forming is a metal forming process in which a piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts. Stretch forming is performed on a stretch press, in which a piece of sheet metal is securely gripped along its edges by gripping jaws. The gripping jaws are each attached to a carriage that is pulled by pneumatic or hydraulic force to stretch the sheet. The tooling used in this process is a stretch form block, called a form die, which is a solid contoured piece against which the sheet metal will be pressed. The most common stretch presses are oriented vertically, in which the form die rests on a press table that can be raised into the sheet by a hydraulic ram. As the form die is driven into the sheet, which is gripped tightly at its edges, the tensile forces increase and the sheet plastically deforms into a new shape. Horizontal stretch presses mount the form die sideways on a stationary press table, while the gripping jaws pull the sheet horizontally around the form die
Sheet Metal Forming,Sheet Metal Forming Services,Custom Sheet Metal Forming,Precision Sheet Metal Forming Suzhou FCE precision electronics Co., LTD , https://www.fukeyifcesz.com
1 About power factor issues
The SCR phase-shift trigger classifier is a 9-stage $11 type. This rectifier transformer is graded to greatly increase the power factor, and the power factor reaches over 0.93. In 2002, our factory successfully developed the S11 type thyristor constant voltage constant current rectifier KHB3. The no-load current is 1.5A. This type of thyristor constant voltage constant current rectifier KHB3 is characterized by low temperature rise. , Low noise, high power factor, ripple factor of 2%. The high-frequency switching power supply is a power supply made of IGBT ferrite, inverter circuit. As early as 1997, our factory provided a switching power supply for Guangxi Zhonghuan Company with a current of 2500A and a voltage of 0-12V. At the time of actual use, the switching power supply was increased to 2300A. The voltage is 10.5V. At the same time, Guangxi Zhonghuan Company also has 4 ZDDKF-2500A0-12V SCR phase-shift triggers.
The current voltage and switching power supply under the same conditions, in the actual use of nearly 5 hours, the results were clearly found. The high-frequency switching power supply can save 5% electricity compared to 4 sets of 2500A thyristor phase-shifting triggers, but the deposition speed of the switching power supply is slow, and the hardness of the piston ring surface is also not as high as the thyristor phase-shift trigger. The switching power supply hardness is 800-900 HB. . The ZDDKF2500A thyristor phase-shift trigger ring surface hardness of up to 11o0HB. Later, Guangxi Zhonghuan chose ZDDKF with a step-by-step energy-saving thyristor constant-voltage constant-current rectifier KHB3.
Switching power supply and classifying thyristor constant voltage constant current rectifier KHB3 contrast, switching power supply in 2000A12V its total power and SCR phase shift trigger 2000A current is basically the same. The power factor is not much worse, and the power consumption is also equal.
2 Selection and comparison
Under the same conditions, the high-frequency switching power supply saves 5% power compared to the thyristor-class thyristor constant-voltage constant-current rectifier KHB3. However, the power supply deposition rate of the switching power supply is slow, and the surface hardness of the piston ring is also not as high as that of the thyristor phase shift trigger. Domestic authorities recommend the use of thyristor phase-shift triggers. Taiwan's Chuanglin company's piston ring manufacturers also use thyristor phase-shift triggers. German piston ring manufacturers also use thyristor commutated thyristors for constant voltage and constant current. Rectifier KHB3. German experts say that the use of switching power supply plating process is generally used in imitation gold technology, precious metals, watch industry plating. It can be seen that for the piston ring plating, thyristor phase-shift triggers should be used.
3 Using Commutated Thyristor Constant Voltage Constant Current Rectifier KHB3
In order to do a good job on the surface of the piston ring, a commutated thyristor constant voltage constant current rectifier KHB3 should be selected. The operation process is as follows: Initially, the workpiece is placed in the electroplating bath, and the reverse current is used first. In a matter of seconds, with a high-current impact, the impurities on the surface of the piston ring are peeled off. After 15 to 20 seconds of high-current impact, the surface layer quality of the piston ring is improved, and the reverse current is returned to a certain rated value. After a few seconds, the reverse current returns to zero and the forward current is applied after 10-20 seconds through the soft start. This process works well. In power supply rectification, our factory has rich experience and is equipped with various products. We can help users scientific design according to the needs of the industry's production, rational use of rectifier power, make it efficient, energy-saving, economical play a role in production.
Application of thyristor flip-flops in electroplating
Plating on the surface of the piston ring has always been a more used technology. The high-frequency switching power supply and the stepped thyristor phase-shifting trigger produced by our factory are widely used in electroplating in various industries across the country. Several technical issues are discussed. Points to note.