CN103537666A - Powder metallurgy oil pump rotor and manufacturing method thereof - Google Patents

Abstract

The invention discloses a powder metallurgy oil pump rotor. The powder metallurgy oil pump rotor is characterized by being manufactured from, by weight, 21-23 parts of Ni, 1-2 parts of graphite powder, 1-2 parts of Cu, 4-5 parts of Mo, 2-3 parts of manganese sulfide, 5-6 parts of Mo, 83-86 parts of iron powder and 2-3 parts of auxiliaries. According to the raw materials of the rotor, the graphite is added, and therefore abrasion resistance and lubricity of the rotor are improved, the manufactured rotor is compact in organization, good in microstructure, very few in pore, and excellent in structural rigidity, hardness, fatigue resistance and tensile strength performance; besides, due to the fact that mold pressing is adopted, equipment is simplified, and production cost is reduced.

Description

A kind of powder metallurgy rotor of engine oil pump and preparation method thereof

Technical field

The present invention relates to field of powder metallurgy, particularly a kind of powder metallurgy rotor of engine oil pump and preparation method thereof.

Background technology

Rotor-type oil pump is comprised of housing, internal rotor, outer rotor and pump cover etc.Internal rotor is fixed on armature spindle with key or pin, by crankshaft toothed wheel, is directly or indirectly driven, and the eccentric throw at internal rotor and outer rotor center is e, and internal rotor drives outer rotor to rotate in the same direction together.The internal rotor of general rotor-type oil pump has 4 or 4 above double wedges, many one of the tappet number of the recessed gear ratio internal rotor of outer rotor, the nonsynchronous in the same way rotation of inner and outer Rotator like this.The gabarit pattern curve of rotor is trochoid.When rotor tooth form tooth Profile Design must make rotor forward any angle to, on the profile of tooth profile of each tooth of inner and outer Rotator, total energy becomes mutually some contact.Between inner and outer Rotator, form like this 4 working chambers, along with the rotation of rotor, the volume of these 4 working chambers is constantly to change.A side cavity at oil input channel, because rotor is thrown off engagement, volume increases gradually, produces vacuum, machine oil is inhaled into, rotor continues rotation, and machine oil is brought to a side of oil road, at this moment, rotor just in time enters engagement, this cavity volume is reduced, and oil pressure raises, and machine oil is extruded and goes out through oil road force feed between cog.Like this, along with the continuous rotation of rotor, machine oil is just constantly inhaled into and extrudes.

Powder metallurgy be produce metal dust or with metal dust (or mixture of metal dust and non-metal powder) as raw material, through being shaped and sintering, produce the industrial technology of metal material, composite and all kinds goods.At present, PM technique has been widely used in the fields such as traffic, machinery, electronics, Aero-Space, weapons, biology, new forms of energy, information and nuclear industry, becomes one of branch of tool development vitality in new material science.That PM technique possesses is significantly energy-conservation, economize material, excellent performance, Product Precision is high and the series of advantages such as good stability, is very suitable for producing in enormous quantities.In addition, part material and the also available PM technique manufacture of complex parts that with conventional cast method and machining process, cannot prepare, thereby enjoy the attention of industrial quarters.Powder metallurgy structural part product material composition is not limited by melting, both can add alloying component, can add other structural constituent yet, and adjusts as requested in sizable scope, and then can reach the effect of mating with steel part in mechanical property.

Powder metallurgy mechanization degree is high, can reduce personnel, can raise the efficiency again, so that cost-saving.PM technique can replace traditional manufacturing process, for the vast traditional forms of enterprises cost-saving.

So study the formula of the powder metallurgy of various components of machine, adapt to different needs, have great importance.

The profile of tooth of existing internal rotor is sharper, and the top of its tooth is very narrow, and in use procedure, easily wearing and tearing, cause engine failure.So the invention provides a kind of method that adopts powder metallurgical technique to manufacture inside and outside rotor in oil pump, the inside and outside rotor in oil pump that the method is produced has higher tooth portion intensity, long service life, and process time is short, and cost is low.

Summary of the invention

The object of this invention is to provide that a kind of intensity is large, the powder metallurgy automobile rotor of engine oil pump of long service life and preparation method thereof.

In order to realize object of the present invention, the present invention passes through following scheme implementation:

A rotor of engine oil pump, is made by the raw material of following weight portion: nickel 21-23, graphite powder 1-2, copper 1-2, molybdenum 4-5, manganese sulfide 2-3, Mo5-6, iron powder 83-86, auxiliary agent 2-3;

Described auxiliary agent is made by the raw material of following weight portion: iron powder 30-34, bamboo charcoal 3-5, citric acid 2-3, nano titanium oxide 1-2, Silane coupling agent KH550 1-2, tri-iron tetroxide 3-4, potassium dihydrogen phosphate 1-2, zinc stearate 2-3, N220 carbon black 1-2, MTMS 1-2; Preparation method mixes iron powder, bamboo charcoal, tri-iron tetroxide, potassium dihydrogen phosphate, N220 carbon black, grind to form 200-300 order powder, then add MTMS to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.

Powder metallurgy rotor of engine oil pump of the present invention, by following concrete steps, made:

(1) nickel, copper, molybdenum, Mo, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 5-8Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-650 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 52-56 ℃, after mixing and stirring 60-90 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 2-3 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; Then, then be cooled to 725-750 ℃ with 10-12 ℃/min of speed, be incubated after 1-2 hour, then to be cooled to 320-340 ℃ with 8-10 ℃/min of speed again, be incubated after 2-3 hour, in air, slow cooling is to room temperature.

In raw material of the present invention, increase graphite, increased wearability and the lubricity of rotor, the rotor dense structure of manufacture, microstructure is good, and seldom, the rigidity of structure, hardness, fatigue performance, tensile strength properties are good for hole; And owing to having adopted mold pressing, make simplified equipment, reduced production cost.

Specific embodiments

Below by instantiation, the present invention is described in detail.

A rotor of engine oil pump, is made by the raw material of following weight portion: nickel 21-23, graphite powder 1-2, copper 1-2, molybdenum 4-5, manganese sulfide 2-3, Mo5-6, iron powder 83-86, auxiliary agent 2-3;

Described auxiliary agent by following weight portion (kilogram) raw material make: iron powder 30, bamboo charcoal 3, citric acid 2, nano titanium oxide 1, Silane coupling agent KH550 1, tri-iron tetroxide 3, potassium dihydrogen phosphate 1, zinc stearate 2, N220 carbon black 1, MTMS 1; Preparation method mixes iron powder, bamboo charcoal, tri-iron tetroxide, potassium dihydrogen phosphate, N220 carbon black, grind to form 200-300 order powder, then add MTMS to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.

Powder metallurgy rotor of engine oil pump of the present invention, by following concrete steps, made:

(1) nickel, copper, molybdenum, Mo, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 5-8Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-650 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 52-56 ℃, after mixing and stirring 60-90 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 2-3 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; Then, then be cooled to 725-750 ℃ with 10-12 ℃/min of speed, be incubated after 1-2 hour, then to be cooled to 320-340 ℃ with 8-10 ℃/min of speed again, be incubated after 2-3 hour, in air, slow cooling is to room temperature.

Through detection, hardness of the present invention: HRC55; Tensile strength: 1060MPa.

Claims (2)

1. a powder metallurgy rotor of engine oil pump, is characterized in that, by the raw material of following weight portion, is made: nickel 21-23, graphite powder 1-2, copper 1-2, molybdenum 4-5, manganese sulfide 2-3, Mo5-6, iron powder 83-86, auxiliary agent 2-3;

Described auxiliary agent is made by the raw material of following weight portion: iron powder 30-34, bamboo charcoal 3-5, citric acid 2-3, nano titanium oxide 1-2, Silane coupling agent KH550 1-2, tri-iron tetroxide 3-4, potassium dihydrogen phosphate 1-2, zinc stearate 2-3, N220 carbon black 1-2, MTMS 1-2; Preparation method mixes iron powder, bamboo charcoal, tri-iron tetroxide, potassium dihydrogen phosphate, N220 carbon black, grind to form 200-300 order powder, then add MTMS to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.

2. powder metallurgy rotor of engine oil pump according to claim 1, is characterized in that, by following concrete steps, is made:

(1) nickel, copper, molybdenum, Mo, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 5-8Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-650 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 52-56 ℃, after mixing and stirring 60-90 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 2-3 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; Then, then be cooled to 725-750 ℃ with 10-12 ℃/min of speed, be incubated after 1-2 hour, then to be cooled to 320-340 ℃ with 8-10 ℃/min of speed again, be incubated after 2-3 hour, in air, slow cooling is to room temperature.