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A high-density non-magnetic steel balance weight part and its preparation method

A technology of balance block and non-magnetic steel, applied in the field of powder metallurgy, can solve the problems of unsuitability for industrial production, low sintered blank density, limited product size, etc., and achieves the effects of good practicability, simple process and low cost

Active Publication Date: 2018-02-27
GUANGDONG YUEHAI HUAJIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the invention patent CN102528040 is manufactured by powder metallurgy, but it cannot ensure that the sintered product is non-magnetic, and the density of the sintered billet is low, which cannot meet the requirements of manufacturers with higher quality requirements; although the invention patent CN103834847 A uses powder metallurgy method, and adopts high-speed pressing process, but the size of the prepared product is limited, and the cost is high, so it is not suitable for industrial production

Method used

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  • A high-density non-magnetic steel balance weight part and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] (1) According to mass percentage, weigh 8% WC powder (particle size 50-100μm, C mass fraction is 7%), 10% phosphor copper powder (particle size is 5-20μm, P mass fraction is 8%), 20% Electrolytic pure copper powder (5-10 μm), 1% lithium stearate lubricant, and the rest Fe-26Mn-0.5C pre-alloyed powder (particle size 10-60 μm), and mixed in a V-shaped mixer for 60 minutes, Obtain a homogeneously mixed powder;

[0034] In the Fe-26Mn-0.5C pre-alloyed powder, according to the mass percentage, manganese is 30%, carbon is 0.5%, and the rest is iron. Regular shape powder, powder particle size less than 60μm, oxygen content 1.5wt%, powder fluidity 25s / 50g;

[0035] (2) Form the obtained mixed powder on a 100t hydraulic press with a pressure of 700Mpa to obtain a density of 6.46 g / cm 3 The balance weight parts are compacted;

[0036] (3) Under the protection of the decomposed ammonia atmosphere, the compacted parts of the balance block were sintered in a mesh belt furnace at ...

Embodiment 2

[0038] (1) According to mass percentage, weigh 10% WC powder (particle size 50-100 μm, C mass fraction is 7%), 10% phosphor copper powder (particle size 5-20 μm, P mass fraction is 8%), 25% electrolytic Pure copper powder (5-10 μm), 1% lithium stearate lubricant, the rest is Fe-24Mn-0.3C pre-alloyed powder (particle size 10-60 μm), and mixed in a V-type mixer for 85 minutes, Obtain a homogeneously mixed powder;

[0039] In the Fe-24Mn-0.3C pre-alloyed powder, by mass percentage, manganese is 28%, carbon is 0.3%, and the rest is iron. After smelting, it is made into pre-alloyed Fe-24Mn-0.3C by water atomization. Regular shape powder, powder particle size less than 60μm, oxygen content 1wt%, powder fluidity 30s / 50g;

[0040] (2) Form the obtained mixed powder on a 100t hydraulic press with a pressure of 800Mpa to obtain a density of 6.66 g / cm 3 The balance weight parts are compacted;

[0041] (3) Under the protection of the decomposed ammonia atmosphere, the compacted parts o...

Embodiment 3

[0043] (1) According to mass percentage, weigh 6% WC powder (particle size 50-100μm, C mass fraction is 7%), 10% phosphor copper powder (particle size 5-20μm, P mass fraction is 8%), 15% electrolytic Pure copper powder (5-10 μm), 1% lithium stearate lubricant, and the rest are Fe-20Mn-0.1C pre-alloyed powder (particle size 10-60 μm), and mixed in a V-type blender for 90 minutes to obtain Mixed powder evenly;

[0044] In the Fe-20Mn-0.1C pre-alloyed powder, by mass percentage, manganese is 26%, carbon is 0.1%, and the rest is iron. After smelting, it is made into pre-alloyed Fe-20Mn-0.1C irregular Shaped powder, the powder particle size is less than 60μm, the oxygen content is 2wt%, and the powder fluidity is 28s / 50g;

[0045] (2) Form the obtained mixed powder on a 100t hydraulic press with a pressure of 850Mpa to obtain a density of 6.7g / cm 3 The balance parts compact;

[0046] (3) Under the protection of the decomposed ammonia atmosphere, the compact of the balance block ...

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Abstract

The invention discloses a high-density non-magnetic steel balance weight part and a preparation method thereof. In terms of mass percentage, the raw materials of the high-density non-magnetic steel balance weight parts include the following components: WC powder 6‑10%, phosphor bronze powder 10%, electrolytic pure copper powder 15‑25%, lithium stearate lubricant 1 %, the rest is Fe-Mn-C pre-alloyed powder. The preparation method of the high-density non-magnetic steel balance weight part includes the following steps: (1) Weighing each component according to the mass percentage and mixing them uniformly in a mixer; (2) Compressing the uniformly mixed mixed powder; (3) High temperature sintering. The preparation method of the invention has the advantages of simple process, controllable cost, near-net shape and controllable dimensional change, and high-density non-magnetic steel balance weight parts with a density of 7.7-7.9g / cm3 can be prepared.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a high-density non-magnetic steel balance weight part and a preparation method thereof. Background technique [0002] The balance weight part is an important part of the motor rotor in the compressor. The balance weight can maintain the stable state of the crankshaft during high-speed rotation, and play the role of balance, shock absorption and noise reduction. At present, there are two installation methods of the balance weight, one is to adopt forging or casting method to be integrated with the crankshaft when producing the crankshaft, and the other is to screw on the crankshaft with bolts. Generally, in order to save space, the latter method is often used. Since the motor will generate a magnetic field around it when it is running, in order to prevent the balance weight installed around it from being magnetized, generating magnetic force and causing power loss, we ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/02C22C32/00C22C38/16C22C38/04C22C33/02B22F1/00B22F3/10
CPCC22C30/02C22C32/0052C22C33/0207C22C38/04C22C38/16B22F3/1007B22F2999/00B22F1/10B22F2201/016
Inventor 肖志瑜贾善权关航健朱权利
Owner GUANGDONG YUEHAI HUAJIN TECH CO LTD
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