Screw and powder injection molding method thereof

A technology of injection molding and powder, which is applied in the direction of engine components, other manufacturing equipment/tools, turbines, etc., can solve the problems of high processing costs, tool wear, poor finish, etc., and achieve simplified processing procedures, reduced steps, and low porosity Effect

Active Publication Date: 2015-01-28
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The screw of household oil press is the key technology of oil press. The screw is generally made of food-grade stainless steel 304, which is composed of a power input outer hexagonal and a helical part: the helical part includes Feeding, extrusion, oil extraction, slag discharge and other variable diameter components; screw generally has two processing methods, one is turning, milling, this method is slow, the tool wears seriously, the finish is poor, and the screw and guide rail of the machine tool are seriously damaged. ; Two, screw whirlwind milling and hydraulic whirlwind milling processing technology, the investment of this equipment is large, and the processing cost is relatively high

Method used

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  • Screw and powder injection molding method thereof
  • Screw and powder injection molding method thereof
  • Screw and powder injection molding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Mix 100 parts of carbonyl iron powder with a particle size of 20 μm and 200 parts of binder to form a homogeneous feed. The binder is composed of 50 parts of paraffin wax and 50 parts of low-density polyethylene.

[0059] (2) An insert is preset inside the mold of the injection molding machine, and the mold temperature is 30°C; the mixed feed is put into the injection molding machine for injection molding to obtain an injection molded blank; the injection temperature is 150°C, and the injection pressure is 5Mpa.

[0060] (3) Put the injection molding blank in the furnace, heat at 200°C for 1 hour, and dewax;

[0061] (4) Under the protective atmosphere of hydrogen, pre-fire the dewaxed injection molded billet. The pre-fired temperature is 200°C for 180min, 300°C for 120min, and 600°C for 100min to remove the remaining bond in the injection molded billet. agent components; then raise the temperature to 1000°C, keep it warm for 2 hours, and pre-fire to obtain a calcin...

Embodiment 2

[0064] (1) Mix 100 parts of carbonyl nickel powder with a particle size of 10 μm and 150 parts of binder to form a homogeneous feed. The binder consists of 20 parts of polypropylene, 10 parts of paraffin wax, 68 parts of carnauba wax, 1 part stearic acid.

[0065] (2) An insert is preset inside the mold of the injection molding machine, and the mold temperature is 50°C; put the mixed feed into the injection molding machine for injection molding to obtain an injection molded blank; the injection temperature is 180°C, and the injection pressure is 15Mpa.

[0066] (3) Put the injection molding blank in the furnace, heat it to 170°C, keep it for 1 hour, and dewax it;

[0067] (4) Under an argon protective atmosphere, pre-burn the dewaxed injection molded billets at 250°C for 60 minutes; (2) 400°C for 80 minutes; (3) 700°C for 100 minutes to remove the injection molding The remainder of the binder component in the billet; then the temperature is raised to 900°C, kept for 2 hours, ...

Embodiment 3

[0070] (1) Mix 100 parts of carbonyl tungsten powder powder with a particle size of 1 μm and 100 parts of binder to form a homogeneous feed. The binder consists of 10 parts of ethylene-vinyl acetate copolymer, 79 parts of paraffin, and 10 parts of Brazilian Palm wax, 1 part stearic acid.

[0071] (2) An insert is preset inside the mold of the injection molding machine, and the mold temperature is 80°C; put the mixed feed into the injection molding machine for injection molding to obtain an injection molded blank; the injection temperature is 200°C, and the injection pressure is 35Mpa.

[0072] (3) Put the injection molding blank in the furnace, heat it to 170°C, keep it for 10 hours, and dewax it;

[0073] (4) Under the protective atmosphere of argon, pre-fire the dewaxed injection molded billet. The pre-fired temperature is 300 ° C for 30 minutes; 500 ° C for 60 min; Binder components;

[0074] (5) Under an argon protective atmosphere, sinter the pre-sintered billet at 2200...

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Abstract

The invention discloses a screw and a powder injection molding method thereof. The method includes the steps of firstly, mixing powder metal materials and binder with the mass ratio being 100:20-200 to form homogeneous feeding materials; secondly, placing the feeding materials into an injection molding machine to perform injection molding so as to obtain injection molding blanks; thirdly, dewaxing; fourthly, pre-sintering at the temperature of 200-800 DEG C to obtain pre-sintered blanks; fifthly, rising the temperature to 1000-2500 DEG C to sinter the pre-sintered blanks for 1-10 hours under a protective atmosphere to obtain screws. The method has the advantages that the binder is added into metal materials for mixing, the metal materials can form the injection molding blanks through injection molding, the binder is completely discharged by dewaxing and pre-sintering, the screws formed by high-temperature sintering, porosity of the screws is reduced greatly, machining procedures are reduced, production efficiency is increased, and the products after injection molding are good in consistency and repeatability.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a powder injection molding method for a screw, in particular to a powder injection molding method for an oil press screw and screw parts. Background technique [0002] The hazards of waste oil, hog oil, saliva oil, fake oil, poisonous oil, and expired oil are self-evident. Although the state has severely cracked down on them, they are still banned repeatedly. People talk about "oil" and change color, but there is no way to avoid it , People are still not sure whether the oil they eat every day is really healthy. In recent years, the household small-scale oil presses launched in the market can solve the problem of oil sanitation. The oil presses generally use screw extrusion presses, which can press peanuts, soybeans, rapeseeds, cottonseeds, oil sunflowers, sesame seeds, and tea seeds. , Tung seeds, castor, almonds, flaxseeds, safflower oilseeds, evening primrose se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F5/00
Inventor 杨桂生姚晨光李万里
Owner HEFEI GENIUS NEW MATERIALS
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