High-density non-magnetic steel counterweight part and manufacturing method thereof

Abstract

The invention discloses a high-density non-magnetic steel counterweight part and a manufacturing method of the high-density non-magnetic steel counterweight part. The high-density non-magnetic steel counterweight part comprises, by mass percentage, 6-10% of WC powder, 10% of phosphor copper powder, 15-25% of electrolytic pure copper powder, 1% of a stearic acid lithium lubricant and the balance Fe-Mn-C prealloyed powder. The manufacturing method of the high-density non-magnetic steel counterweight part includes the following steps that (1), the components are weighed according to the mass percentage and uniformly mixed in a mixing machine; (2), the mixed powder uniformly mixed is pressed and formed; and (3), high temperature sintering is performed. The manufacturing method is simple in process, controllable in cost, near-net formed and controllable in dimensional change, and the high-density non-magnetic steel counterweight part with the density of 7.7-7.9 g / cm<3> is manufactured.

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 ...

Examples

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 6.7 g / cm 3 The balance parts compact;

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

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 ...

Examples

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 6.7 g / cm 3 The balance parts compact;

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