Manufacturing apparatus and manufacturing method of multilayer molded product

Abstract

The die (31) with the mold cavity (32) and the lower punch (41) embedded in the mold cavity (32) are parallel to the fitting direction and pass through the parting surface (34) of the mold cavity (32) After dividing and sliding them, the divided divided cavities (32A, 32B) are arranged in a state along the parting surface (34), and these divided cavities (32A, 32B) are respectively filled with raw material powder , slide the die (31) and the lower punch (41) along the parting surface (34), thereby combining the split cavity (32A, 32B) into the original cavity (32), and pass the upper punch and the lower punch The head (41) compresses the raw material powder in the cavity (32) in the assembled state.

Description

technical field [0001] The present invention relates to a manufacturing device and a manufacturing method for manufacturing a multilayer molded article composed of different layers of raw material powders in powder molding. [0002] This application claims priority based on Japanese Patent Application No. 2016-159569 for which it applied on August 16, 2016, and uses the content here. Background technique [0003] In powder molding, when molding a multilayer molded product composed of different layers of raw material powders, for example, when molding a bearing whose inner peripheral part and outer peripheral part are made of metals with different materials, the The steps are as follows: make the separator interposed between the inner peripheral part and the outer peripheral part, and respectively fill the inner and outer sides with powders of different materials, and perform compression molding after removing the separator. [0004] For example, Patent Document 1 discloses,...

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Problems solved by technology

[0006] According to the device described in this patent document 1, it is better that the punch for separating the space of the die is as thin as possible, but a certain thickness is required for the strength of the metal mold. After filling the space with raw material powder in the state, lowering the punch for separation will form a thin space within the thickness range of the punch for separation, causing a part of the raw material powder filled in the center or peripheral part to collapse to the point where the punch for separation In the space created by the lowering of the head, the interface between the central part and the peripheral part cannot be molded with high precision

[0007] And, after filling the raw material powder into the space of the peripheral part, when filling the raw material powder into the space of the central part, the shoe box (shoe box) passes through the upper part of the raw material powder of the peripheral part that is filled first, so there is a gap that should be filled. The defect that the raw material powder in the central part is also filled on the upper part of the raw material powder in the peripheral part

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