Factors to be considered while selecting an herf process. Explosive forming free download as powerpoint presentation. Explosive hydroforming can efficiently form large parts up to. There are numerous applications for customers in both the automotive and the nonautomotive sectors. Detonation of the explosive forces the workpiece to assume the shape of the tool. Oct 25, 2016 advantages o it can simulate a variety of other conventional metal forming techniques such as stamp or pressforming and spinforming in a single operation. Explosive forming is a process in which forces produced by an explosion are used to shape a workpiece. Rubber forming is used in the aircraft industry to produce sheet metal components. The characteristics of this process are similar to those of explosive forming. Explosives are also used to compact or consolidate metal powders into near net shapes.
Hydroforming techniques seminar report, ppt, pdf for. Jul 24, 2015 numerical simulations of the hydroforming process of tial clad tshapes were conducted by using finite element analysis software. Applications and capabilities of explosive forming request pdf. Explosive hydroforming, also known as herf high energy rate forming or exploform, is a striking alternative to the more traditional process of metal hydroforming. This technique uses the energy generated by an explosive detonation to form the metal work piece.
The capacitor is charged through a charging circuit. Processes syllabus introduction to advanced forming process, high energy rate forming process explosive, electrohydraulic, magnetic pulse forming. So, these are number one underwater explosions, number two underwater spark discharge which is also called electro hydraulic techniques, then pneumatic. Stretch forming, hydro forming, spinning are some of such processes. Conclusion hydroforming is an innovative forming process hydroforming is becoming more popular i. This presentation will focus on the different uses and methods of explosive forming in the aerospace as well as automotive industry. Explosive forming is an ideal process for producing low volumes of very large metal part with low tooling costs. This process can deliver a great deal of flexibility in the metal forming process. Explosive hydro forming is a metal forming technique that uses the energy generated by an explosive detonation to form the metal work piece. The pressure of this shock wave is sufficient to form metal sheet. Pdf simulation and experimental work on manufacturing. Explosive forming can be used to easily produce difficulttomanufacture components. Shell hydroforming process is used to form water tanks, lpg tanks, large building decorative objects, pressure vessel heads and largesize elbow joints with a single layer or double layers as shown in fig.
The major difference, however, is that a chemical explosive is replaced by a capacitor bank, which stores the electrical. Hydroforming is a unique forming process that uses a rubber diaphragm or bladder as a universal female for all drawn parts. Explosive forming is a broad term covering many process variations. By this process, tubes are formed into different shapes. It can be used on materials for which a press setup would be prohibitively large or require an unreasonably high pressure, and is generally much cheaper than building a large enough and sufficiently highpressure press.
Simulation and experimental work on manufacturing torispherical heads in explosive hydro forming process. Jun 04, 2018 explosive forming process, explosive forming process ppt, explosive forming process in hindi, explosive forming process animation, explosive forming 2018, explosive forming titanium, explosive forming. Explosive forming has a long cycle time and is suitable for low quantity production of large, unique parts. Explosive forming definition of explosive forming by the. Stretching of a sheet metal, by holding its ends or edges and bending it over a form block. Rubber forming of sheet metal manufacturing process. Explosive forming, however, is not necessarily a replacement for conventional metal forming techniques. Figure 1 shows the six steps of the hydro forming process. Internal highpressure forming hydroforming is a methodology for the manufacture of hollow metal components a process that. Explosive forming is a metalworking technique in which an explosive charge is used instead of.
Also explore the seminar topics paper on hydroforming techniques with abstract or. Armour 34 provides detailed information on handling, spill cleanup. Stretching of a sheet metal, by holding its ends or edges and bending it over a form block, simultaneously is called stretch forming. Explosive forming process high energy rate forming process. The major difference, however, is that a chemical explosive is replaced by a capacitor bank, which stores the electrical energy. Most deep drawn parts are usually drawn in a single operation. Explosive forming is the forming of sheet metal using explosive materials using large amounts of energy over a very short time.
Explosive hydroforming can efficiently form large parts up to 14 square or 10 in diameter. Sometimes called explosive hydroforming, a workpiece and explosive is placed in a tank of water. Explore hydroforming techniques with free download of seminar report and ppt in pdf and doc format. A finite element model was developed and verified with experimental tests for the. Hydroforming is categorized as a cold forming process. Developments in sheet hydroforming for complex industrial. The hydromechanical deep drawing process has been developed as the radial hydromechanical deep drawing hydrorim process figure 4b.
Figure 1 shows the six steps of the hydroforming process. Numerical analysis of shock wave propagation and al5083. Forming a square section from a round tube in the socalled highpressure process is analysed and then it is shown how some of the process limits in this process can be overcome in a sequential forming process. Explosive forming is best described as a these shortrun applications are the short lead process in which metal parts are formed by the times required and minimum expenditures for high pressures resulting from the detonation of tooling. This process can deliver a great deal of flexibility in the metalforming process. Hydroforming techniques seminar report, ppt, pdf for mechanical. For large parts, explosive hydroforming can generate the forming pressure by. Mechanical properties imparted to the material as a result of the explosive forming process are similar. Forming with hydrostatic pressure hydro mechanical and hydro forming process. Low cost tooling makes setup for rubber forming inexpensive. There are a great variety of sheet metal forming methods, mainly using shear and tensile forces in the operation. Simulation and experimental work on manufacturing torispherical heads in explosive hydroforming process article pdf available in international journal of physical sciences 78 february 2012.
High velocity forming hvf refers to a unique set of methods which are used for metal forming and utilizes a concept which is basically different from that used in conventional forming techniques. Explosive forming process high energy rate forming. Unit iv sheet metal process typical shearing operations 1. The pressure over rubber membrane is controlled through out. The results indicated that tial clad tubes could be. Introduction to explosives and propellants part of the text from parti of this chapter has been presented. Progressive forming rubber hydroforming bending and contouring. This manufacturing process is useful for the production of small quantities of parts. Advantages o it can simulate a variety of other conventional metal forming techniques such as stamp or pressforming and spinforming in a single operation. Numerical analysis of shock wave propagation and al5083 sheet. Investigation of the electrohydraulic forming process. Electrohydraulic forming is a type of metal forming in which an electric arc discharge in liquid is used to convert electrical energy to mechanical energy and change the shape of the workpiece. For large parts, explosive hydroforming can generate the forming pressure by simply exploding a charge above the part complete with evacuated mold which is immersed in a pool of water. As the name itself hints, hvf or high velocity forming refers to a set of techniques which are used for metal forming.
Internal highpressure forming hydroforming is a methodology for the manufacture of hollow metal components a process that has grown enormously since the mid1990s. Explosive hydroforming explosive hydroforming is a metal forming technique that uses the energy generated by an explosive detonation to form the metal work piece. Process the rapid change in explosive in to gas produce a shock wave. Explosive forming 1 unconfined type or stand off technique. This process can deliver a great deal of flexibility in. Explosive hydro forming process in accordance with the universities and university college act 1971 and the constitution of the universiti putra malaysia p. It is a process of particular interest to the automotive industry. Tube hydroforming is one of the most popular unconventional metal forming processes which is widely used to form various tubular components. These simulations were used to optimize process parameters such as internal pressure, feed distance, and friction coefficient.
It can form complex parts that would otherwise require several punched and welded pieces. For large parts, explosive hydroforming can generate the forming pressure by simply exploding a charge above the part complete with evacuated mold which is. A capacitor bank delivers a pulse of high current across two electrodes, which are positioned a short distance apart while submerged in a fluid water. The flow of explosive materials from the from the rest of the. The ability to quickly prototype a unitized figure 4. Mechanical properties imparted to the material as a result of the explosive forming process are similar to mechanical properties imparted to work manufactured by other forming processes. This includes the methods of explosive forming, electrohydraulic. Explosive hydroforming is a metal forming technique that uses the energy generated by an explosive detonation to form the metal work piece. This paper presents an investigation on high energy rate micro forming hermf of a thin aluminum foil using a high velocity forming hvf technique. Parts are drawn into the rubber and produced through displacement pressure. Hydroforming process, sheet hydroforming, shell hydroforming, tube hydroforming. Simulation and experimental work on manufacturing torispherical heads in explosive hydroforming process. Sometimes called explosive hydroforming, a workpiece and explosive is placed in a tank of.
It is used for the manufacture of geometrically highly complex hollow bodies from tubular parts. Sheet metal operations other sheet metal forming processes. Hydro forming processes hydroforming processes are classified mainly in to 3 types as described below. This allows us to make less costly tooling with shorter leadtimes.
Hydroforming simulation and experiment of clad tshapes. Several solvents commonly used in the laboratory can form explosive reaction products through a relatively slow oxidation process in the presence of atmospheric oxygen. Jan 01, 20 conclusion hydroforming is an innovative forming process hydroforming is becoming more popular i. Subsequently, hydroforming experiments were conducted based on these simulations. The process to form sheet metal parts by using hydraulic parts to form the required shapes. The explosive metal forming process this technique uses the energy generated by an explosive detonation to form the metal work piece. Numerical simulations of the hydroforming process of tial clad tshapes were conducted by using finite element analysis software. The tooling can be much cheaper than what would be required for any presstype process.
One of these new processes is tube hydroforming and although the development of this process for the automotive industries is relative new, many process variables have been studied, including. The hydro forming is a costeffective way of shaping. Explosive forming is a metalworking technique in which an explosive charge is used instead of a punch or press. Also explore the seminar topics paper on hydroforming techniques with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020.
The process has become popular for the manufacture of aluminium. A model for deformation in high energy rate micro forming. Progressive forming rubber hydroforming bending and contouring spinning processes explosive forming shearing and blanking stretch forming deep drawing. These techniques could include methods such as explosive forming. The forming process starts by placing a blank on the blank holder. One of these new processes is tube hydroforming and although the development of this process for the automotive industries is relative new, many. The explosive energy replaces the male part of the tool that is used in regular forming processes. Explosive forming is the forming of sheet metal using explosive.
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