Method for feeding neodymium iron boron magnetic powder into die for pressing in layered mode

A technology of neodymium iron boron and magnetic powder, which is applied in the field of compression molding of neodymium iron boron magnetic powder, which can solve the problems of uniform magnet density, large margin for pressed products, inconsistent product density, etc., and achieve uniform density and consistent magnetic properties Good, the effect of reducing production costs

Active Publication Date: 2014-11-05
NINGBO KETIAN MAGNET CO LTD +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem of inconsistency in product density and large margin reserved for pressed products in the compression molding of NdFeB magnetic powder, and proposes a method for evenly distributing NdFeB in the mold cavity to solve the problem of uniform density of magnets

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for feeding neodymium iron boron magnetic powder into die for pressing in layered mode
  • Method for feeding neodymium iron boron magnetic powder into die for pressing in layered mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 , figure 2 As shown in the figure, to press a NdFeB magnet product of a certain specification, the cavity size is designed to be 20.5mm (length) × 65.5mm (width) × 83.85mm (depth). According to the ratio of the cross-sectional area of ​​the rectangular mold cavity 6 to the depth of the mold cavity, the number of layered feeding layers and the depth of each layer of feeding material are calculated, and the feeding hopper 4 is placed on the horizontal guide rail 1 on the mold cavity 6, controlled by PLC The feeder 12 controls the feeding process as follows: the lower oil cylinder 9 drives the magnetic scale 10 to move upward, and pushes the lower pressure head 8 to rise. When the measured value of the magnetic scale 10 reaches the preset value, that is, when the height of the upper cavity of the mold cavity 6 reaches 22mm , the lower oil cylinder 9 stops moving, and the reciprocating cylinder 5 is commanded to move, driving the feeding hopper 4 to move ...

Embodiment 2

[0021] For pressing NdFeB magnet products of a certain specification, the cavity size is designed to be 58.6mm (length) × 52.3mm (width) × 84.48mm (depth). According to the ratio of the cross-sectional area of ​​the rectangular mold cavity 6 to the depth of the mold cavity, the number of layered feeding layers and the depth of each layer of feeding material are calculated, and the feeding hopper 4 is placed on the horizontal guide rail 1 on the mold cavity 6, controlled by PLC The feeder 12 controls the feeding process as follows: the lower oil cylinder 9 drives the magnetic scale 10 to move upward, and pushes the lower pressure head 8 to rise. When the measured value of the magnetic scale 10 reaches the preset value, that is, when the height of the upper cavity of the mold cavity 6 reaches 30mm , the lower oil cylinder 9 stops moving, and the reciprocating cylinder 5 is commanded to move, driving the feeding hopper 4 to move forward along the guide rail 1. When the feeding cha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for feeding neodymium iron boron magnetic powder into a die for pressing in a layered mode. The method comprises the following steps that: the number of feeding layers and the feeding depth of each layer are calculated; the weighed magnetic powder is put into a feeding hopper arranged on a horizontal guide rail; a magnetic scale moves upwards and measures a preset value of a first layer, the feeding hopper moves forwards to the upper part of a die cavity along a horizontal guide plate, feeds and fills the die cavity and moves backwards to scrape the magnetic powder on the surface of the die cavity; and the magnetic scale moves downwards to a second layer and stops descending, the feeding hopper performs feeding and scraping for the second time, and the process is repeated until the final layer is fed and the magnetic powder is scraped. By a layered feeding and scraping method, the powder in the die cavity is uniformly filled, a magnetic steel product formed by pressing has a regular shape and is high in dimensional accuracy, reserved machining allowance can be reduced, and production cost is reduced; and the magnetic steel product formed by pressing has uniform density, and is high in magnetic property consistency after being magnetized.

Description

technical field [0001] The invention relates to a molding method of neodymium-iron-boron magnetic powder, in particular to a layered feeding method for magnetic powder into a mold cavity. Background technique [0002] Most NdFeB magnets are molded by magnetic powder in the mold cavity. Due to the small size, high viscosity and poor fluidity of NdFeB magnetic powder, when it is poured into the mold cavity, it will naturally accumulate into an "arch pile" phenomenon, which is difficult to flatten. The corners will increase the porosity of the magnetic powder in the mold cavity, uneven distribution in the mold cavity, inconsistent product density after pressing, a large processing allowance for the pressed product, and inconsistent magnetic orientation of the product, which will affect the performance of the magnet. [0003] CN102489701A In the automatic magnetic powder powder molding press, a quantitative feeding device is proposed, and the feeding plate under the liner of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): B22F3/02
Inventor王育平叶孟林
OwnerNINGBO KETIAN MAGNET CO LTD