The emergence of any thing and product is because it has advantages that other things cannot match, so the internal high pressure is no exception. Here we will introduce it in detail, and follow Xiaobian to learn about it. Hope to help everyone.

In the molding stage, increasingInternal high pressureMake the transition R angle completely fit the mold cavity, and the workpiece is completed. Cracking pressure The cracking pressure of the tube blank. Molding pressure is the pressure required to ensure that the part is fully formed in the later molding stage. The selection basis of axial feed force axial propulsion cylinder is determined by three parts: the force to ensure the plastic deformation of the tube blank, the high pressure reaction force and friction force of the punch. The clamping force is the force required for the molding process and is the main basis for selecting a hydraulic press. The internal high-pressure filling volume determines an important parameter of the horizontal cylinder stroke. Due to the influence of the loading path and friction, the feed cannot be completely sent to the forming area, and the wall thickness of the forming area should be reduced. The actual dosage is usually 60% ~ 80% of the ideal dosage. 1). The internal high-pressure molding process can reduce development and manufacturing costs, reduce body weight, and improve material utilization. Internal high-pressure forming parts usually only require one set of molds, while sheet metal stamping often requires three or more processes, and mold development and subsequent manufacturing costs will greatly increase. The number of processes is reduced, and the waste of processes is correspondingly reduced. In the case of meeting the requirements of the parts, the hollow parts formed by internal high pressure molding can reduce the weight by 20% ~ 30% and the material utilization rate can be increased by 30% to 50% compared with the stamping welding assembly.

The internal high-pressure forming process can improve the machining accuracy of parts and the safety performance of the car body. For parts with complex shapes, internal high-pressure molding can achieve one-time molding, avoiding the cumulative error of parts in the multi-process processing process, thereby improving the accuracy of parts. Internal high pressure is a cold working process. The strength of the part can be greatly improved by work hardening during the deformation process, and the integrity of the original tube blank is good, and its overall rigidity can be guaranteed. Body safe. Due to the large pressure required for internal high-pressure molding, the tonnage required for the clamping press is also large, usually above 3500t. The high-voltage generation source and electrical control system are more complex, and the equipment manufacturing cost is also high. In addition, since the molding quality and wall thickness distribution of the parts are closely related to the loading path, the R & D and trial production costs are relatively high. These factors, to some extent, limitInternal high pressureThe development and promotion of molding process.

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