The electromagnetic assisted sheet metal tensile rapid forming system mainly comprises a unit body group, a forming press, a shape adjustment computer control system, a shape modifying computer control system, a forming computer control system and a CAD software system.
The unit body group is composed of a plurality of aligned cylindrical unit bodies. Since the linear stepping motor has the advantages of simple structure, high positioning accuracy, fast response speed and high sensitivity, we choose a linear stepping motor to realize the drive adjustment of each unit body. In order to prevent the unit body from causing lateral slip due to the lateral force, we have a fixed baffle around the unit body group, and can also guide the basic body adjustment. When the basic body group is shaped and modified, it is directly fixed to the frame of the press like the integral mold, guided by the guide column, driven by the hydraulic system to realize the overall movement of the basic body group to form the part. The CAD software system can draw the shape of the formed part according to the shape characteristics of the formed part, and provide data information for the shape control computer control system and the shape correction computer control system. Mode, shape and shape computer control system
According to the data information of the geometry of the shaped part provided by the CAD software system, the basic body group is adjusted and the current in the electromagnetic coil in the unit body is controlled, and the electromagnetic modification of the mold and the control press are performed. The difficulty of this technology is the development of the software module for the analysis, calculation and modification control system of the modified magnetic field.
2.2 Analysis of work process
The unit body used in electromagnetically assisted sheet metal drawing.
It mainly comprises electromagnetic coil 1, electromagnet core 2, magnetic isolation material 3, connector 4, lead 5 and the like, and each unit body is connected with a linear stepping motor through a connector. The electromagnetic assisted sheet metal stretch forming process can be generally divided into three processes of shaping, shaping and forming. Before forming, the computer controls each unit body to move to a specified position according to the CAD graphic data of the formed part, so that the envelope surface of the unit body head forms the curved shape of the formed part, which is a shaping process. After the unit body is driven to the specified position, and then another set of control circuits, the computer calculates the data of each of the energized coils by analyzing the data of the formed parts according to the shape data of the CAD of the formed parts. The electromagnetic assisted sheet metal draws the magnitude of the current in the unit body and energizes each of the electromagnetic coils to form a magnetic field required for shaping. The unit body group is then placed in a container filled with magnetic powder material powder, and the unit body is filled with magnetic material powder after being pulled out. Reuse
An equal-sized concave magnetic field is modified. It is known from Newton's third law that the excess magnetic powder on the punch is removed to form the punch required for forming, which is a modification process. The die can be a rubber bladder or a rubber soft mold filled with a high-pressure liquid, or a modified die. In turn, the modified unit group can be modified by the punch. The magnetic field at this time is only a modified magnetic field, and it cannot be used for forming. The forming also requires another clamping magnetic field with a large strength. Under the action of strong forming and clamping magnetic force, the unit body and the magnetic powder become an integral solid mold, which can be used for forming. The forming is not affected by the thickness of the forming material, and the same forming thickness as that of the conventional solid mold can be achieved.
When it is necessary to form a new part, simply cancel the clamping magnetic field. The linear stepping motor is controlled by the profile control system, and the unit body is driven to a new designated position, and then modified and clamped to become a new mold shape.
Electromagnetically assisted sheet metal deep drawing technology has been different from moldless multi-point forming technology and is a brand new technology. In the multi-point forming technology, the contact between the plate and the unit body is point contact, and the contact area is relatively small, so that indentation defects are inevitably generated in the final forming. Although the elastic pad technique is used, since the elastic pad itself is relatively soft, sometimes the sheet and the unit body are hardly deformed sufficiently, and rebound phenomenon is likely to occur. The electromagnetic assisted sheet metal stretch forming technology, for the formed part, is not a discrete unit body, but an integral mold, so that defects such as indentation and step effect can be well eliminated.
3 Conclusion
Electromagnetically assisted sheet metal tensile rapid prototyping technology is a new topic. It is a comprehensive subject in the fields of electromagnetism, mechanics, plastic forming, computer control technology, CAD/CAM and tribology. It has practical application and theoretical research significance. Electromagnetically assisted sheet metal deep drawing Shaanxi speed forming technology not only has the advantages of multi-point forming, but also has the advantages of integral mold. Not only suitable for new product development and design verification, but also for mass production. The characteristics of this mold are: short production cycle, low cost, easy to modify, and can also be used as a process verification before the production of formal steel molds. It is foreseeable that this technology will be widely used and developed in the automobile, shipbuilding and aerospace industries, and has broad application prospects, which will produce significant economic and social benefits.
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