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Preparation method of hollow-structure metal or ceramic part

A technology for parts and metals, applied in the field of co-injection molding, can solve the problems of not using hollow parts and process complexity, and achieve the effects of short production cycle, cost reduction and product cost reduction

Inactive Publication Date: 2012-02-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the process, it has not been applied to the preparation of hollow parts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A 17-4PH stainless steel hollow sphere with a wall thickness of 3 mm and a diameter of 20 mm was prepared.

[0031] Take 17-4PH stainless steel iron powder as the shell raw material powder, the binder is composed of 10% vegetable oil, 30% high-density polyethylene, 60% paraffin, the volume ratio of the powder and the binder is 65:35, the powder and the binder The agent is mixed in the mixer, the mixing temperature is 100°C, and prepared as a feed. The inner core is made of paraffin wax, and it is co-injected on a co-injection molding machine. First, the inner core is injected, the injection temperature is 6 °C, and the injection pressure is 40MPa. , the injection speed is 30g / s. After forming, the mold temperature is cooled to 20-30°C for demoulding, and the inner core is obtained. The inner core is transferred to the second cavity for injection and feeding. The injection temperature is 130°C and the injection pressure is It is 60MPa, the injection speed is 30g / s, and t...

Embodiment 2

[0033] Prepare a Ti-6V-4V hollow part with a wall thickness of 6mm and a diameter of 20mm.

[0034]Take the atomized Ti6Al4V powder, the binder is composed of 15% vegetable oil, 35% polypropylene, 30% paraffin, and 20% polymethyl methacrylate, mix the uniformly mixed powder and binder in the previous step on the mixer , the powder volume ratio is 40%, the mixing temperature is 180 ° C, and then extruded and granulated on the extruder to make the feed more uniform, and prepare a shell feed. The core fluid is made of 50% high-density polyethylene and 50 The mixture of % paraffin, the feed is co-injected on a co-injection molding machine, the injection temperature of the inner core is 180 °C, the injection pressure is 100 MPa, the injection speed is 60 g / s, and the mold temperature is 50 °C; the shell injection temperature is 220 °C, and the injection The pressure is 120MPa, the injection speed is 70g / s, and the mold temperature is 55°C to obtain an injection blank. The obtained...

Embodiment 3

[0036] Prepare α-Al with a wall thickness of 1mm and a diameter of 20mm 2 o 3 Ceramic hollow parts.

[0037] Take α-Al 2 o 3 Ceramic powder is the shell material, and the binder consists of 10% stearic acid, 20% high-density polyethylene, and 70% polyethylene glycol. The powder and binder are mixed on a mixer, and the powder volume ratio is 50%. The kneading temperature is 150°C, and the shell feed is prepared. The inner core material is a mixture of 30% NaCl, 30% KCl, 5% stearic acid, and 25% high-density polyethylene, which is injection molded on a co-injection molding machine. The core injection temperature is 110°C, the injection pressure is 100MPa, and the injection speed is 70g / s. After forming, the mold temperature is cooled to 30°C to open the mold. The shell injection temperature is 150°C, the injection pressure is 80MPa, and the injection speed is 55g / s s, the mold temperature is 40°C to obtain the injection blank. Degrease the obtained injection body in dichlor...

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Abstract

The invention relates to a preparation method of a hollow-structure metal or ceramic part, which comprises the following steps: selecting metal or ceramic powder as the raw material, mixing, and granulating to obtain a feed material; selecting a core material; injecting the core material into a die by co-injection molding to obtain a core in hollow shape, and injecting the metal or ceramic feed material to be completely coated on the core, thereby obtaining a green body; and carrying out solvent extraction and heating on the green body to remove the adhesive and core, and sintering to obtain the hollow-structure product. The invention implements one-step molding of the hollow metal or ceramic part; from the raw material to the product, the production cycle is short, and the automation degree of equipment is high, thereby greatly enhancing the efficiency and forming a randomly complex and completely hollow die cavity; and thus, the invention can be used for preparing a completely hollow part with no joint, greatly lowers the cost of the product, and is especially suitable for preparing hollow metal and ceramic parts.

Description

technical field [0001] The invention discloses a technical method for preparing hollow metal or ceramic parts, and belongs to the technical field of co-injection molding preparation. Background technique [0002] With the development of the national economy and the demand for energy saving and emission reduction, the lightweight and multifunctional parts have become a research hotspot. Hollow metal and ceramic parts can not only reduce the weight of structural materials, but also have the advantages of economy, environmental protection, and resource conservation. Functionally, they can also meet the needs of functional parts such as electrostatic shielding and magnetic shielding. more and more applications. [0003] Traditional methods for manufacturing hollow metal parts mainly include: (1) machining methods such as drilling, forging, and assembly; (2) liquid forming methods such as investment casting and gas-assisted forming; (3) ion cladding, spray deposition , powder f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622B22F3/115B22F5/10B28B1/24
Inventor 何浩李益民刘攀
Owner CENT SOUTH UNIV
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