Permanent-magnetism wet pressure bottom-jacking type forming hydraulic press

Abstract

The invention discloses a permanent-magnetism wet pressure bottom-jacking type forming hydraulic press, which is used for solving the problems of long forming time, low efficiency, poor consistency of green bodies, large deviation and poor quality in the conventional permanent-magnetism wet pressure forming hydraulic press. The permanent-magnetism wet pressure bottom-jacking type forming hydraulic press comprises a pressure-bearing oil cylinder, a top-entering oil cylinder and a mold, wherein the mold is arranged between the pressure-bearing oil cylinder and the top-entering oil cylinder, the pressure-bearing oil cylinder is positioned above the mold, and the top-entering oil cylinder is positioned below the mold. During the wet pressure forming process, the pressure-bearing oil cylinder does not move, the top-entering oil cylinder moves upwards, so that the wet pressure forming process is finished, and the permanent-magnetism wet pressure bottom-jacking type forming hydraulic press has the characteristics of short forming time, high efficiency, good consistency of green bodies, small deviation and high quality.

Description

technical field [0001] The invention belongs to the field of permanent magnet wet pressing forming, and in particular relates to a permanent magnet wet pressing top forming hydraulic press. Background technique [0002] my country has become a major producer of magnetic materials, and its output has accounted for more than 60% of the world. There are currently more than 300 permanent magnet manufacturers in China. The production of ferrite permanent magnet materials includes the preparation of aqueous slurry, wet pressing, sintering, Grinding, sorting, and packaging are several major processes, among which wet pressing is the key process, and its investment accounts for more than half of the entire production line. The quality of the forming press is directly related to the performance, efficiency and benefits of the green body. Therefore, wet pressing Forming presses have attracted much attention from manufacturers. In the early 1990s, relevant large-scale enterprises introdu...

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Problems solved by technology

[0003] However, when the cavity is floated and pressed down, the water-containing slurry and material particles move downward, while the water moves upward and is squeezed out. The direction of water and the direction of movement of material particles are just opposite. In addition, when the magnetic tile-shaped green body is formed, the surface of the outer arc reaches the density first, and the moisture is passed through the high-density layer of the outer arc. In addition to the long molding time, the more important thing is that when the moisture forcibly passes through the outer arc, it is easy to cause defects such as cracks in the blank , so that the quality of the green body is poor

[0004] At the same time, due to the floating cavity, it is difficult to accurately control the filling height of the slurry in the cavity, and the formed green body has a large thickness deviation and poor consistency

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