Rare-earth powder high-pressure forming system

Abstract

The invention discloses a rare-earth powder high-pressure forming system, and belongs to the intelligent control field of powder orientating, pressing and forming. An auxiliary hydraulic system which takes a high-sensitivity controllable proportional valve assembly as a core is arranged for product mould-stripping motion control. A modern mechanology, electronics and algorithm integrated technology is combined, and motion displacement information of pistons of upper and lower hydraulic cylinders is acquired throughout the whole process; an industrial programmable controller is taken as a data central processor to judge rising displacement difference of upper and lower pistons, so that a servo motor is controlled in real time in a feed-back mode; and the servo motor drives a precision mechanical device to realize regulation on relative flow at outlets A and B of a proportional valve assembly, so that pistons of the upper and lower cylinders are guaranteed to synchronously rise, and high-density products are smoothly taken out from a concave mould.

Description

technical field [0001] The invention relates to the field of intelligent control of powder orientation and press molding, in particular to a rare earth powder high pressure molding system. Background technique [0002] As the demand for rare earth permanent magnet materials increases and the solid density of products after directional pressing needs to reach 4.2g / cm3, the current traditional magnetic pole orientation and pressing molding process can no longer meet the requirements of rare earth permanent magnet materials. [0003] Steps of traditional pole orientation, press molding process: [0004] 1. Manually add powder into the magnetic press, and sweep the powder to make it smooth; [0005] 2. The movement of the upper piston is pressed and formed, the upper piston rises, and the lower piston does not move; [0006] 3. The upper piston rises to the top, and the lower piston pushes out the first pressed molded product output, which is manually taken out; [0007] 4. E...

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Problems solved by technology

[0008] It is divided into two steps in total, and the whole product needs to be carried out in an oxygen-free environment and filled with nitrogen, and when the density of the finished product reaches 3.8g / cm3 or more, the allowable deformation of the solid product is small, and the finished product is taken out from the upper and lower molds due to Uneven pressure is easy to cause damage, and secondary processing can make the product density reach the quality requirement of 4.2g / cm3, the pressing process is complicated and the finished product density is insufficient

[0009] Under the traditional magnetic pole oriented pressing molding process, when the finished product density reaches 3.8g / cm3, the qualified rate of mold release cannot reach the ratio specified by the company, and the product has a small flatness rate, and the utilization rate of the blank in subsequent processing is reduced. Therefore, Secondary processing is necessary, nitrogen consumption rate is increased, and process time is greatly increased

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