A kind of gel ultrasonic vibration forming method of metal parts

A technology of ultrasonic vibration and components, which is applied in the field of metal powder forming, can solve the problems of high requirements, and achieve the effect of increasing solid content, increasing bulk density and eliminating air bubbles

Inactive Publication Date: 2015-08-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The retrieved patent number is CN201010541941.8, which provides a method of centrifugal casting fiber reinforced composite pipe jacking, which uses centrifugal casting method to form the jacking pipe, but the requirements for molds and equipment are relatively high, so it is necessary to develop suitable Low-cost process for industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Implementation Example 1: Titanium products formed by gel ultrasonic vibration.

[0015] 1. Mix 90ml hydroxyethyl methacrylate and 270ml toluene, add 0.03g benzoyl peroxide;

[0016] 2. Add titanium hydride powder with an average particle size of 5 μm into the premix, then add 3.6ml of oleic acid and 3.6ml of polyethylene glycol-400, and stir evenly to obtain a stable slurry;

[0017] 3. Add 3.6ml of dimethylaniline, stir quickly and evenly, inject into the ultrasonic vibration mold, and vibrate continuously at 20KHz for 5 minutes;

[0018] 4. After the shaking, take out the green body from the mold, and dry it in an electric blast drying oven at 70°C for 1 hour. The finally obtained green body has no pore defects and has a solid content of 54vol.%.

Embodiment 2

[0019] Implementation example 2: gel ultrasonic vibration forming stainless steel products.

[0020] 1. Mix 158ml hydroxyethyl methacrylate and 40ml toluene, add 1.7g benzoyl peroxide;

[0021] 2. Add stainless steel powder with an average particle size of 20 μm to the premix, then add 1.98ml oleic acid and 0.99ml polyethylene glycol-400, and stir evenly to obtain a stable slurry;

[0022] 3. Add 1.98ml of dimethylaniline, stir quickly and evenly, inject it into the ultrasonic vibration mold, and vibrate continuously at 25KHz for 30 minutes;

[0023] 4. After the shaking, take out the green body from the mold, and dry it in an electric blast drying oven at 100°C for 5 hours. The finally obtained green body has no pore defects and has a solid content of 55vol.%.

Embodiment 3

[0024] Implementation example 3: Gel ultrasonic vibration forming YG8 cemented carbide products.

[0025] 1. Mix 120ml hydroxyethyl methacrylate and 120ml toluene, add 0.17g benzoyl peroxide;

[0026] 2. Add YG8 cemented carbide powder with an average particle size of 3.4 μm to the premix, then add 0.168ml oleic acid and 0.108ml polyethylene glycol-400, and stir evenly to obtain a stable slurry;

[0027] 3. Add 0.168ml of dimethylaniline, stir quickly and evenly, inject into the ultrasonic vibration mold, and vibrate continuously at 40KHz for 15 minutes;

[0028] 4. After the shaking, take out the green body from the mold, and dry it in an electric blast drying oven at 80°C for 3 hours. The finally obtained green body has no pore defects and has a solid content of 57vol.%.

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PUM

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Abstract

The invention discloses a gel ultrasonic concussion forming method for metal parts and belongs to the field of metal part preparation in powder metallurgy production process. The method includes the steps that metal powder is suspended in premixed liquid of hydroxyethyl methylacrylate and methylbenzene to obtain high-concentration suspension slurry, and the slurry is poured into a mould to be subject to ultrasonic concussion, wherein the premixed liquid has a certain concentration, and an initiating agent is dissolved in the premixed liquid; curing time is controlled through adjusting the adding quantity of a catalyst in the slurry so that a curing reaction can be completed in the concussion process after a certain time; the viscosity of the slurry is controlled through adding the appropriate amount of macromolecular plasticizer, wherein the problems of uneven density and composition segregation caused by concussion are solved. The method can overcome the defects that a common gel-casting formed product is high in porosity and low in strength, improve solid content of the common gel-casting formed product greatly and prepare high-density and high-strength metal products, and is especially suitable for preparing the metal parts which are difficult to machine, such as cemented carbide and high-melting-point alloy.

Description

technical field [0001] The invention relates to a metal powder forming technology, which belongs to the field of metal parts preparation in the powder metallurgy production process, and in particular provides a low-cost and high-reliability near-net shape preparation technology for parts. technical background [0002] Gel injection molding technology was originally proposed to solve the problem of near-net-size forming of complex-shaped parts. This forming method has outstanding advantages such as simple equipment, easy forming of complex-shaped parts, strong usability, and easy debinding. As a result, it has received great attention from academia and industry at home and abroad. [0003] Gel injection molding belongs to slurry molding, which has defects such as high porosity and low green body strength. At present, the centrifugal method is mainly used to improve it. The retrieved patent number is CN201010541941.8, which provides a method of centrifugal casting fiber reinf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 徐晓娟杨春雷段启凯章彦娴梁毅郭志猛叶青张欣悦
Owner UNIV OF SCI & TECH BEIJING
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