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A preparation method of powder metallurgy rubberized sprocket

A technology of powder metallurgy and sprockets, which is applied in the field of preparation of powder metallurgy rubber-covered sprockets, can solve the problems of reduced hardness of sprocket teeth, reduced sprocket toughness, high price, etc., and achieves satisfactory bonding strength, low cost, The effect of convenient processing

Active Publication Date: 2019-07-23
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One way to remove grease is to bake it at a temperature greater than 200°C for a long time, but it will cause the hardness of the sprocket teeth to decrease
The second method is to carry out vacuum hydrocarbon cleaning on the finished sprocket. This method can effectively remove the grease in the pores of the sprocket, but the efficiency is low and the price is expensive.
The third method is to steam the sprocket. This method can prevent grease from infiltrating into the pores of the sprocket. The disadvantage is that the toughness of the sprocket is reduced.

Method used

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  • A preparation method of powder metallurgy rubberized sprocket
  • A preparation method of powder metallurgy rubberized sprocket
  • A preparation method of powder metallurgy rubberized sprocket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Mixing: The chemical composition of the sprocket is: Fe-2.0Ni-1.0%Cu-0.8%C (mass fraction), and the ingredients are 95.6% 100 mesh water atomized iron powder, 2% carbonyl nickel powder, 1.0 % electrolytic copper powder, 0.8% graphite powder, and 0.6% powder lubricant.

[0035] 2. Forming: Mold the mixed powder at room temperature, the pressing pressure is 700MPa, and the forming density is 7.0g / cm 3 .

[0036] 3. Sintering: the sintering temperature is 1120°C, the heat preservation time is 25 minutes, and the protective atmosphere is a nitrogen-hydrogen mixed atmosphere;

[0037] 4. Densification: Put one side of the sintered sprocket flat in the flat spraying equipment, sandblast with 40-80 mesh sand grains for 40 minutes, then turn the part over and place the other side upwards, and sandblast for 40 minutes again, the whole part has a thickness of about 20-30μm surface dense layer.

[0038] 5. Shaping: After the densified sprocket is impregnated with lubricating...

Embodiment 2

[0048] 1. Mixing: The chemical composition of the sprocket is: Fe-2.0Ni-0.75%C (mass fraction), and the ingredients are 96.85% of 100 mesh water atomized iron powder, 2% of carbonyl nickel powder, and 0.75% of graphite powder , add 0.4% powder lubricant.

[0049] 2. Forming: The mixed powder is pressed in a warm mold at 70°C with a pressing pressure of 800MPa to obtain a green body with a density of 7.15g / cm3 .

[0050] 3. Sintering: The sintering temperature is 1150°C, the temperature is kept for 25 minutes, and the protective atmosphere is a nitrogen-hydrogen mixed atmosphere;

[0051] 4. Densification: Put one side of the sintered sprocket flat in the flat spraying equipment, sandblast with 40-80 mesh sand grains for 30 minutes, then turn the part over and place the other side up, and then sandblast for 30 minutes, the whole part has a thickness of about 15-25μm surface dense layer.

[0052] 5. Shaping: After the densified sprocket is impregnated with lubricating oil, it ...

Embodiment 3

[0060] 1. Mixing: The chemical composition of the sprocket is: Fe-2.0Cu-0.85%C (mass fraction), and the ingredients are 96.4% of 100 mesh water atomized iron powder, 2% of electrolytic copper powder, and 0.85% of graphite powder , add 0.75% powder lubricant.

[0061] 2. Forming: the mixed powder is pressed at room temperature, the pressing pressure is 700MPa, and the green density is 7.05g / cm 3 .

[0062] 3. Sintering: The sintering temperature is 1120°C, the heat preservation is 23min, and the protective atmosphere is a nitrogen-hydrogen mixed atmosphere;

[0063] 4. Densification: Put one side of the sintered sprocket flat in the flat spraying equipment, sandblast with 40-80 mesh sand grains for 50 minutes, then turn the part over and place the other side up, and sandblast again for 50 minutes, the whole part has a thickness of about 30-40μm surface dense layer.

[0064] 5. Shaping: After the densified sprocket is impregnated with lubricating oil, it is shaped on a 300-50...

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Abstract

The invention relates to a preparation method of an encapsulated chain wheel for powder metallurgy. The method comprises the following steps: 0-3.0% by mass of Cu, 0-3.0% by mass of Ni, 0.6%-0.9% by mass of C, 0.2%-0.8% by mass of a lubricant and the balance of Fe are mixed, forming and sintering are performed, the chain wheel is subjected to densification and then is subjected to reshaping, heat treatment, cleaning, sand blasting, encapsulation, injection molding, secondary vulcanization and machining, and the encapsulated chain wheel for powder metallurgy is obtained. By densification of the surface of the chain wheel, various kinds of grease are effectively prevented from permeating holes in a production process of powder metallurgy parts, so that all residual grease on the surfaces of the parts can be removed in a following cleaning process, adverse effects of the grease on bonding of powder metallurgy parts and rubber are avoided, the method has the characteristics of simplicity in technology and convenience in process, the problem about bonding of metal and the rubber in the encapsulation process of the chain wheel is solved better, the complicated procedure of degreasing after the grease permeates the powder metallurgy parts is avoided, the cost is low, and the mechanical properties of the product are not reduced.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a powder metallurgy rubber-covered sprocket. Background technique [0002] The variable timing system is an important part of the engine's gas distribution mechanism, which optimizes the gas distribution process of the engine. In the variable timing system, the crankshaft sprocket and the camshaft gear are connected by a timing belt or a timing chain. The advantages of the timing belt are mature technology, low cost, and low noise. The biggest disadvantage is that its life is limited and it needs to be replaced regularly. In comparison, the timing chain has high reliability, wear resistance, and long service life, but the timing chain generates vibration and noise during the transmission process, which greatly affects the NVH of the car. An effective improvement measure is to bond a layer of rubber on the crankshaft sprocket to reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/14B29C35/02B22F5/08B22F3/24C22C38/16C22C38/08B08B3/12B08B3/08
CPCB08B3/08B08B3/12B22F3/24B22F5/08B29C35/02B29C45/0053B29C45/14B29L2031/749C22C38/08C22C38/16
Inventor 秦晓冬包崇玺
Owner NBTM NEW MATERIALS GRP
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