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A high-density non-magnetic balance block and its powder metallurgy preparation method and application

A technology of powder metallurgy and magnetic balance, applied in the direction of mechanical equipment, liquid variable displacement machinery, variable displacement pump components, etc., can solve the problem of high density and full density, high alloy elements or carbon content, which are difficult to meet Production needs and other issues, to achieve the effect of low cost, excellent performance, and good prospects for industrialized production

Active Publication Date: 2015-10-28
GUANGDONG YUEHAI HUAJIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the size of the motor continues to decrease, the size of the balance weight is also reduced, which puts forward new requirements for the size of the material. Generally, the non-magnetic steel products produced by precision casting have poor material uniformity, poor surface quality of castings and production Low efficiency, it is difficult to meet the production needs of large quantities of low cost and pollution-free
A certain degree of research has been carried out on the non-magnetic balance weight of compressors at home and abroad. Among them, the invention patent ZL102517520A-a non-magnetic compressor motor balance weight is made by powder metallurgy, but the composition of the material is too complicated and there are many alloy components. ; Invention patent ZL102528040A-compressor balance block powder metallurgy production process, although it is also produced by powder metallurgy, but the alloy elements or carbon content are too high, it is difficult to obtain high density and full density by traditional pressing methods, especially up to 7.6~7.8g / cm 3 density of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of high-density non-magnetic balance weight for compressors

[0035] Mix Fe, Mn, and C powders in proportion and smelt them under vacuum. 2 Pre-alloyed Fe-16Mn-0.1C oval powder is made by gas atomization, the powder particle size is less than 147μm, and the powder fluidity is 25s / 50g. Among them, Fe-16Mn-0.1C means that the manganese content in the pre-alloy is 16wt%, the carbon content is 0.1wt%, and the rest is iron.

[0036] WC powder with a particle size of 5-20 μm was mixed with Fe-16Mn-0.1C powder, the mass ratio of Fe-16Mn-0.1C to WC was 94:6, and mixed by mechanical ball milling for 30 minutes. Then add a lithium stearate lubricant with a mass fraction of 0.3 wt%, and mix in a V-type blender for 90 minutes. After the powder is mixed evenly, the mixed powder is pressed at a high speed of 3.0m / s to obtain a density of 7.59g / cm 3 of compacts. The balance block compact is passed through a mesh belt furnace under the protective atmosphere o...

Embodiment 2

[0037] Example 2: Preparation of high-density non-magnetic balance weight for compressors

[0038] Mix Fe, Mn, and C powders in proportion and smelt them under vacuum. 2 Pre-alloyed Fe-12Mn-0.5C oval powder is made by gas atomization, the powder particle size is less than 147μm, and the powder fluidity is 30s / 50g. Among them, Fe-12Mn-0.5C means that the manganese content is 12wt%, the carbon content is 0.5wt%, and the rest is iron.

[0039] WC powder with a particle size of 5-20 μm was mixed with Fe-12Mn-0.5C powder, the mass ratio of Fe-12Mn-0.5C to WC was 97:3, and mixed by mechanical ball milling for 30 minutes. Then add a lithium stearate lubricant with a mass fraction of 0.4 wt%, and mix in a V-type blender for 90 minutes. After the powder is mixed evenly, the mixed powder is pressed at a high speed of 8.0m / s to obtain a density of 7.77g / cm 3 of compacts. The balance block compact is passed through a mesh belt furnace under the protective atmosphere of decomposed ammo...

Embodiment 3

[0040] Example 3: Preparation of high-density non-magnetic balance weight for compressors

[0041] Mix Fe, Mn, and C powders in proportion and smelt them under vacuum. 2 Pre-alloyed Fe-14Mn-0.3C oval powder is made by gas atomization, the powder particle size is less than 147μm, and the powder fluidity is 28s / 50g. Among them, Fe-14Mn-0.3C means that the manganese content is 14wt%, the carbon content is 0.3wt%, and the rest is iron.

[0042] WC powder with a particle size of 5-20 μm was mixed with Fe-14Mn-0.3C powder, the mass ratio of Fe-14Mn-0.3C to WC was 92:8, and mixed by mechanical ball milling for 30 minutes. Then add a lithium stearate lubricant with a mass fraction of 0.5 wt%, and mix in a V-type blender for 90 minutes. After the powder is mixed evenly, the mixed powder is pressed at a high speed of 6.0m / s to obtain a density of 7.75g / cm 3 of compacts. The balance block compact is passed through a mesh belt furnace under the protective atmosphere of decomposed ammo...

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Abstract

The invention belongs to the technical field of powder metallurgy, and discloses a high-density non-magnetic balance block as well as a powder metallurgy preparation method and an application thereof. The powder metallurgy preparation method comprises the following steps: pressing Fe-Mn-C prealloy and WC at a high speed, and carrying out high temperature sintering, thus obtaining the high-density non-magnetic balance block. The powder metallurgy preparation method has the advantages that the high performance is realized by using the WC for enhancing the Fe-Mn-C prealloy, the problem of poor compressibility caused by addition of the enhancing particles WC is solved by adopting a high-speed pressing and forming technology, so that the alloy material with the high density and excellent performance is obtained, the high performance is realized under the condition that the non-magnetic balance block comprises relatively few components, and the density of the non-magnetic balance block reaches 7.6-7.8g / cm<3>. The powder metallurgy preparation method disclosed by the invention is simple in process, short in technological process, low in cost, good in practicability, fast in forming, high in production efficiency, adopts near-net forming and has good industrial production prospect.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a high-density non-magnetic balance weight and a powder metallurgy preparation method and application thereof. Background technique [0002] The balance weight in the compressor plays an important role in maintaining the stable state of the crankshaft when it rotates at high speed. The quality of each part of the object is different. Under static and low-speed rotation, the uneven quality will affect the stability of the object's rotation. The higher the speed, the greater the vibration. The balance block protects the smooth operation of the motor. At present, some crankshaft balance weights are integrated with the crankshaft during forging or casting. Some are screwed on the crankshaft with bolts. When the installation space is not enough, the bolt fastening method is often used. When the balance weight is in use, magnetization or magnetic field cannot occur in the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/12F04B39/00
Inventor 肖志瑜陆宇衡刘潇温利平
Owner GUANGDONG YUEHAI HUAJIN TECH CO LTD
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