CN103252498B - A kind of preparation method of valve seat powder metallurgy - Google Patents
A kind of preparation method of valve seat powder metallurgy Download PDFInfo
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Abstract
The preparation method who the invention discloses a kind of valve seat powder metallurgy, it comprises the following steps: described valve seat be by the raw material of following weight percentage make modified additive, the 10-20% of silicon, the 1-2% of chromium, the 0.3-0.4% of graphite powder, the 0.1-0.2% of vanadium, the 0.6-0.8% of manganese sulfide, the 0.2-0.3% of carbon, the 0.2-0.4% of nickel, the 0.2-0.3% of 0.4-0.6% copper, all the other are iron, the present invention is by the modified additive adding, superfines is provided in mixed material, this superfines can be filled between oarse-grained gap, thereby improve the apparent density of compound, the new modified auxiliary agent obtaining by auxiliary agents such as silane couplers, every physical characteristics such as the wearability of goods are further improved, wherein plastic of poly vinyl acetate and atoleine add in modified additive as lubricant, strengthen this modified additive in the effect of mixing compacting, under equal pressing pressure, significantly improve powder metallurgy structural part compact strength, raw material particle combining form and pore shape are changed, the generation that has solved crackle from root.
Description
Technical field
The present invention relates generally to a kind of preparation method of valve seat powder metallurgy, belongs to casting field.
Background technology
Along with the economic development of China, powder metallurgy structure purposes is more and more wider. Powder metallurgy, as a kind of near-net-shape technology, has very large economic advantages in the time of the part that the batches such as production structure part are large, dimensional accuracy is high, processing charges are high. But there is a weakness in powder metallurgy structural part: product compact strength before sintering is not very low, causes easily occurring in moulding and handling process crackle, and cannot in manufacture process, find out. This if vehicle key position part is fatal defect, has caused powder metallurgy structural part can only be applied on medium to low-risk stressed member in some application, and the scope of application is limited by very large.
Powder metallurgy structural part intensity is affected by three aspects: factor mainly: the one, and material composition, the 2nd, product density, the 3rd, whether product there is crackle in moulding and handling process. Material composition affects manufacturing cost, and product density is very large on forming bench and mould loss impact, and crackle is mainly subject to pressed compact intensity effect, and is difficult to find out.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, and a kind of preparation method of valve seat powder metallurgy is provided.
The present invention is achieved by the following technical solutions:
A preparation method for valve seat powder metallurgy, it comprises the following steps:
(1) batching: described valve seat is to be made up of the raw material of following weight percentage:
The copper of the silicon of the graphite powder of the manganese sulfide of the nickel of 0.4-0.6%, the carbon of 0.2-0.3%, 0.2-0.4%, the vanadium of 0.2-0.3%, 0.6-0.8%, the chromium of 0.1-0.2%, 0.3-0.4%, the modified additive of 1-2%, 10-20%, all the other are iron;
Described modified additive is to be made up of the raw material of following weight parts:
Nanometer feldspar in powder 90-100, calcium hydroxide 30-40, stearic acid 30-40, cumyl peroxide 6-8, plastic of poly vinyl acetate 8-10, sorbitan monooleate 2-4, AEO 2-3, atoleine 3-4, vinyl three ('beta '-methoxy ethyoxyl) silane 0.8-1, water are appropriate;
The preparation method of described modified additive comprises the following steps:
A, by the water of the quality such as the calcium hydroxide of above-mentioned weight portion joins, agitating heating 20-30 minute at 90-110 DEG C, obtains calcium hydroxide aqueous solution;
B, the stearic acid of above-mentioned weight portion is heated to 60-70 DEG C, add sorbitan monooleate, the AEO of above-mentioned weight portion, rising temperature is as for 80-85 DEG C, constant temperature stirs 1-2 hour, under stirring condition, be slowly added into above-mentioned calcium hydroxide aqueous solution, after interpolation, continue to stir 1-2 hour, obtain mixed liquor;
C, the nanometer feldspar in powder particle of above-mentioned weight portion is distributed in water, obtains the suspension containing nanometer feldspar in powder;
D, above-mentioned containing adding cumyl peroxide, plastic of poly vinyl acetate, the atoleine of above-mentioned weight portion to stir 40-50 minute under the speed of 500-600 rev/min in the suspension of nanometer feldspar in powder, add again vinyl three ('beta '-methoxy ethyoxyl) silane of above-mentioned weight portion and the mixed liquor that step B obtains, high speed 1800-2000 rev/min is stirred 20-30 minute, dry, grind into superfines, obtain described modified additive.
(2) compacting: the copper of above-mentioned weight portion, iron, modified additive are pre-mixed, then add the each raw material of residue to mix, suppress 3-4 minute under the pressure of 600-1000MPa, make the blank of colding pressing;
(3) sintering: be that nitrogen hydrogen volume compares under the condition for 1:3-4 in sintering atmosphere, the above-mentioned blank of colding pressing is carried out to sintering under the pressure of 1-5MPa, temperature schedule is: first pre-burning 20-30 minute at 800-900 DEG C, be constant temperature sintering 1-2 hour at 900-1200 DEG C in temperature again, and then cooling to normal temperature with the Speed Reduction temperature of 4-6 DEG C/point, obtain blank;
(4) shaping: the blank after sintering is carried out to shaping with shaping mould to it, obtain semi-finished product;
(5) heat treatment: above-mentioned semi-finished product are incubated to 1-3 hour at 860-880 DEG C, then enter oil groove and quench, oil temperature is 45-55 DEG C;
(6) cold treatment: the semi-finished product after heat treatment are left standstill to 18-20 hour, cold treatment 60-80 minute under the environment of put into-50--60 DEG C at normal temperatures;
(7) tempering: the semi-finished product after cold treatment are sent into tempering furnace tempering 1-2 hour, temperature 200-250 DEG C, insulation 1-2 hour;
(8) carbo-nitriding: the Cymag that is 2-3:1-2:1 by weight ratio, sodium carbonate, sodium chloride mix, at 800-900 DEG C, heating melts, and then reduces the temperature to 700-750 DEG C, the semi-finished product after above-mentioned tempering is put into dipping 40-60 minute;
(9) oil cooling: the semi-finished product after above-mentioned carbo-nitriding are put into 32# normal temperature machine oil, be dipped into 1-2 hour, taking-up drains, and obtains described valve seat.
In every liter of described Phosphating Solution solution, contained raw material weight (g) is:
Trbasic zinc phosphate 60-70, manganese phosphate 50-60, calcium phosphate 10-15, sulfuration mangaic acid nickel 3-6, tartaric acid 2-4.
Advantage of the present invention is:
The present invention is by the modified additive adding, superfines is provided in mixed material, this superfines can be filled between oarse-grained gap, thereby improve the apparent density of compound, and the main component of this superfines is nanometer feldspar in powder and calcium stearate, pass through silane coupler, the new modified auxiliary agent that the auxiliary agents such as cumyl peroxide obtain, every physical characteristics such as the wearability of goods are further improved, wherein plastic of poly vinyl acetate and atoleine add in modified additive as lubricant, strengthen this modified additive in the effect of mixing compacting, under equal pressing pressure, significantly improve powder metallurgy structural part compact strength, raw material particle combining form and pore shape are changed, the generation that has solved crackle from root.
Detailed description of the invention
Embodiment 1
A preparation method for valve seat powder metallurgy, it comprises the following steps:
(1) batching: described valve seat is to be made up of the raw material of following weight percentage:
0.6% nickel, 0.3% carbon, 0.4% manganese sulfide, 0.3% vanadium, 0.8% graphite powder, 0.2% chromium, 0.4% silicon, 2% modified additive, 20% copper, all the other are iron;
Described modified additive is to be made up of the raw material of following weight parts:
Nanometer feldspar in powder 100, calcium hydroxide 40, stearic acid 40, cumyl peroxide 8, plastic of poly vinyl acetate 10, sorbitan monooleate 4, AEO 3, atoleine 4, vinyl three ('beta '-methoxy ethyoxyl) silane 0.8, water are appropriate;
The preparation method of described modified additive comprises the following steps:
A, by the water of the quality such as the calcium hydroxide of above-mentioned weight portion joins, agitating heating 20-30 minute at 110 DEG C, obtains calcium hydroxide aqueous solution;
B, the stearic acid of above-mentioned weight portion is heated to 70 DEG C, add sorbitan monooleate, the AEO of above-mentioned weight portion, rising temperature is as for 85 DEG C, constant temperature stirs 2 hours, under stirring condition, be slowly added into above-mentioned calcium hydroxide aqueous solution, after interpolation, continue to stir 2 hours, obtain mixed liquor;
C, the nanometer feldspar in powder particle of above-mentioned weight portion is distributed in water, obtains the suspension containing nanometer feldspar in powder;
D, above-mentioned containing adding cumyl peroxide, plastic of poly vinyl acetate, the atoleine of above-mentioned weight portion to stir under the speed of 600 revs/min 50 minutes in the suspension of nanometer feldspar in powder, add again vinyl three ('beta '-methoxy ethyoxyl) silane of above-mentioned weight portion and the mixed liquor that step B obtains, 2000 revs/min are stirred 30 minutes at a high speed, dry, grind into superfines, obtain described modified additive.
(2) compacting: the copper of above-mentioned weight portion, iron, modified additive are pre-mixed, then add the each raw material of residue to mix, suppress under the pressure of 1000MPa 4 minutes, make the blank of colding pressing;
(3) sintering: be that nitrogen hydrogen volume compares under the condition for 1:4 in sintering atmosphere, the above-mentioned blank of colding pressing is carried out to sintering under the pressure of 5MPa, temperature schedule is: first pre-burning 30 minutes at 900 DEG C, be constant temperature sintering 2 hours at 1200 DEG C in temperature again, and then cooling to normal temperature with the Speed Reduction temperature of 6 DEG C/point, obtain blank;
(4) shaping: the blank after sintering is carried out to shaping with shaping mould to it, obtain semi-finished product;
(5) heat treatment: above-mentioned semi-finished product are incubated to 3 hours at 880 DEG C, then enter oil groove and quench, oil temperature is 55 DEG C;
(6) cold treatment: the semi-finished product after heat treatment are left standstill to 20 hours at normal temperatures, put under the environment of-60 DEG C cold treatment 80 minutes;
(7) tempering: the semi-finished product after cold treatment are sent into tempering furnace tempering 1-2 hour, and 250 DEG C of temperatures, are incubated 2 hours;
(8) carbo-nitriding: the Cymag that is 3:2:1 by weight ratio, sodium carbonate, sodium chloride mix, at 800-900 DEG C, heating melts, and then reduces the temperature to 700-750 DEG C, and the semi-finished product after above-mentioned tempering are put into, and floods 60 minutes;
(9) oil cooling: the semi-finished product after above-mentioned carbo-nitriding are put into 32# normal temperature machine oil, be dipped into 2 hours, taking-up drains, and obtains described valve seat.
Performance test:
Ultimate tensile strength intensity σ b (MPa): 817
Yield strength σ s (MPa): 512
Percentage elongation δ 5 (%): 16.6
Contraction percentage of area ψ (%): 40.
Claims (1)
1. a preparation method for valve seat powder metallurgy, is characterized in that it comprises the following steps: (1) batching: described valve seat is to be made up of the raw material of following weight percentage: the copper of the silicon of the graphite powder of the manganese sulfide of the nickel of 0.4-0.6%, the carbon of 0.2-0.3%, 0.2-0.4%, the vanadium of 0.2-0.3%, 0.6-0.8%, the chromium of 0.1-0.2%, 0.3-0.4%, the modified additive of 1-2%, 10-20%, all the other are iron; Described modified additive is to be made up of the raw material of following weight parts: nanometer feldspar in powder 90-100, calcium hydroxide 30-40, stearic acid 30-40, cumyl peroxide 6-8, plastic of poly vinyl acetate 8-10, sorbitan monooleate 2-4, AEO 2-3, atoleine 3-4, vinyl three ('beta '-methoxy ethyoxyl) silane 0.8-1, water are appropriate; The preparation method of described modified additive comprises the following steps: A, by the water of the quality such as the calcium hydroxide of above-mentioned weight portion joins, and agitating heating 20-30 minute at 90-110 DEG C, obtains calcium hydroxide aqueous solution; B, the stearic acid of above-mentioned weight portion is heated to 60-70 DEG C, add sorbitan monooleate, the AEO of above-mentioned weight portion, rising temperature is as for 80-85 DEG C, constant temperature stirs 1-2 hour, under stirring condition, be slowly added into above-mentioned calcium hydroxide aqueous solution, after interpolation, continue to stir 1-2 hour, obtain mixed liquor; C, the nanometer feldspar in powder particle of above-mentioned weight portion is distributed in water, obtains the suspension containing nanometer feldspar in powder; D, above-mentioned containing adding cumyl peroxide, plastic of poly vinyl acetate, the atoleine of above-mentioned weight portion to stir 40-50 minute under the speed of 500-600 rev/min in the suspension of nanometer feldspar in powder, add again vinyl three ('beta '-methoxy ethyoxyl) silane of above-mentioned weight portion and the mixed liquor that step B obtains, high speed 1800-2000 rev/min is stirred 20-30 minute, dry, grind into superfines, obtain described modified additive; (2) compacting: the copper of above-mentioned weight portion, iron, modified additive are pre-mixed, then add the each raw material of residue to mix, suppress 3-4 minute under the pressure of 600-1000MPa, make the blank of colding pressing; (3) sintering: be that nitrogen hydrogen volume compares under the condition for 1:3-4 in sintering atmosphere, the above-mentioned blank of colding pressing is carried out to sintering under the pressure of 1-5MPa, temperature schedule is: first pre-burning 20-30 minute at 800-900 DEG C, be constant temperature sintering 1-2 hour at 900-1200 DEG C in temperature again, and then be cooled to normal temperature with the Speed Reduction temperature of 4-6 DEG C/point, obtain blank; (4) shaping: the blank after sintering is carried out to shaping with shaping mould to it, obtain semi-finished product; (5) heat treatment: above-mentioned semi-finished product are incubated to 1-3 hour at 860-880 DEG C, then enter oil groove and quench, oil temperature is 45-55 DEG C; (6) cold treatment: the semi-finished product after heat treatment are left standstill to 18-20 hour, cold treatment 60-80 minute under the environment of put into-50--60 DEG C at normal temperatures; (7) tempering: the semi-finished product after cold treatment are sent into tempering furnace tempering 1-2 hour, temperature 200-250 DEG C, insulation 1-2 hour; (8) carbo-nitriding: the Cymag that is 2-3:1-2:1 by weight ratio, sodium carbonate, sodium chloride mix, at 800-900 DEG C, heating melts, and then reduces the temperature to 700-750 DEG C, the semi-finished product after above-mentioned tempering is put into dipping 40-60 minute; (9) oil cooling: the semi-finished product after above-mentioned carbo-nitriding are put into 32# normal temperature machine oil, be dipped into 1-2 hour, taking-up drains, and obtains described valve seat.
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| CN103556056B (en) * | 2013-09-24 | 2015-09-30 | 宁波宁江粉末冶金有限公司 | Electric control vibration damper valve seat of vehicle |
| CN103567433A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder metallurgy valve seat and preparation method thereof |
| CN103572163A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder-metallurgy valve seat insert and preparation method thereof |
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| CN103540854B (en) * | 2013-10-11 | 2016-08-17 | 芜湖市鸿坤汽车零部件有限公司 | A kind of sintered metal powder bearing steel and preparation method thereof |
| CN104087858B (en) * | 2014-08-01 | 2016-08-24 | 宁国市南方耐磨材料有限公司 | A kind of ball mill steel ball |
| CN104162671A (en) * | 2014-08-26 | 2014-11-26 | 无锡柯马机械有限公司 | Powder post-processing method adopted in powder metallurgy technology |
| CN105586535B (en) * | 2015-12-28 | 2017-12-08 | 仪征市昌达粉末冶金制品有限公司 | Without cobalt-alloy material powder metallurgy valve seat and its preparation method and application |
| CN111515388A (en) * | 2020-05-06 | 2020-08-11 | 合肥波林新材料股份有限公司 | Hydraulic motor cushion block and preparation method thereof |
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