Combined mold

A composite mold and mold body technology, applied in the field of composite molds, can solve the problems that are not conducive to controlling the dimensional accuracy and surface quality of the blank, affect the dimensional accuracy and surface quality of the blank, increase the grinding amount of the blank product, etc., and meet the requirements of ensuring smoothness. , Improve surface quality, small deformation effect

CN103846435AActive Publication Date: 2014-06-11SANVAC BEIJING MAGNETICS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-06-11

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Abstract

The invention discloses a combined mold which comprises a mold body, an upper pressing head and a lower pressing head, and is characterized in that the mold body adopts an integrated structure; the inner sides and the outer sides of the mold body, the upper pressing head and the lower pressing head are made of different materials; particularly, the outer sides of the mold body, the upper pressing head and the lower pressing head are made of a magnetism-conductive material, and the inner sides of the mold body, the upper pressing head and the lower pressing head are made of a graphite material. Due to the adoption of high-intensity graphite, the service life of the mold is obviously prolonged, and the forming qualification rate of a permanent magnet material blank product can be increased; the surface precision and the smoothness requirement of the blank product are improved, and the pressing cost is lowered.
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Description

technical field

[0001] The invention relates to a composite mold, in particular to a composite mold used in the compression molding process of permanent magnet materials. Background technique

[0002] In the production process of permanent magnet materials produced by powder metallurgy process, it generally includes powder making-pressing-sintering and other processes. In order to obtain the permanent magnetism of the product, it is necessary to put the micro powder in the mold and press the magnetic field orientation to obtain a compact product. In this process, the molding die has an important influence on the molding quality of the compact product and the magnetic properties of the final magnet.

[0003] At present, the vertical magnetic field orientation molding press is generally used, that is, the orientation direction of the magnetic field is perpendicular to the pressing direction. The electromagnet is fixed on the operating platform of the press, and the two sets of...

Examples

Embodiment 1

[0035] Figure 2A , 2B , 2C is a structural schematic diagram of a mold for pressing a block-shaped product, as shown in the figure, 1 is a mold cavity, 2 is a graphite material layer, and 3 is a magnetically conductive material layer. The mold body is composed of an outer magnetic material layer and an inner 5mm thick graphite material layer, and the upper and lower indenters are also composed of magnetic material and graphite material, and the thickness of the graphite material layer in contact with the pressed powder is also 5mm. The friction coefficient of the graphite material layer ranges from 0.04 to 0.1, and the thermal expansion coefficient ranges from (0.5 to 3)*10 -6 K -1 , the Mohs intensity value ranges from 1 to 3, and the smoothness value ranges from >0.4. Pour the NdFeB micropowder into the cavity of the mold, then carry out the mold clamping orientation, then the upper and lower block-shaped product pressure heads enter the mold cavity for bidirectional pre...

Embodiment 2

[0041] Figure 3A , 3B , 3C is a structural schematic diagram of a mold for pressing a cylindrical product, as shown in the figure, 1 is a mold cavity, 2 is a graphite material layer, and 3 is a magnetically conductive material layer. The mold body is composed of an outer magnetic material layer and an inner 10mm thick graphite material layer, and the upper and lower indenters are also composed of magnetic material and graphite material, and the thickness of the graphite material layer in contact with the pressed powder is also 10mm. The friction coefficient of the graphite material layer ranges from 0.04 to 0.1, and the thermal expansion coefficient ranges from (0.5 to 3)*10 -6 K -1, the Mohs intensity value ranges from 1 to 3, and the smoothness value ranges from >0.4. Pour the NdFeB micropowder into the cavity of the mold, then carry out the mold clamping orientation, then the upper and lower block-shaped product pressure heads enter the mold cavity for bidirectional pre...

Embodiment 3

[0047] Figure 4A , 4B , 4C is a structural schematic diagram of a mold for pressing trapezoidal products, as shown in the figure, 1 is a mold cavity, 2 is a graphite material layer, and 3 is a magnetically conductive material layer. The mold body is composed of an outer magnetic material layer and an inner 30mm thick graphite material layer, and the upper and lower indenters are also composed of magnetic material and graphite material, and the thickness of the graphite material layer in contact with the pressed powder is also 30mm. The friction coefficient of the graphite material layer ranges from 0.04 to 0.1, and the thermal expansion coefficient ranges from (0.5 to 3)*10 -6 K -1 , the Mohs intensity value ranges from 1 to 3, and the smoothness value ranges from >0.4. Pour the NdFeB micropowder into the cavity of the mold, then carry out the mold clamping orientation, then the upper and lower block-shaped product pressure heads enter the mold cavity for bidirectional pre...