CN105154894A - Valve bush carbonitriding thermal treatment process for high-pressure common rail - Google Patents
Valve bush carbonitriding thermal treatment process for high-pressure common rail Download PDFInfo
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- CN105154894A CN105154894A CN201510632227.2A CN201510632227A CN105154894A CN 105154894 A CN105154894 A CN 105154894A CN 201510632227 A CN201510632227 A CN 201510632227A CN 105154894 A CN105154894 A CN 105154894A
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Abstract
The invention provides a valve bush carbonitriding thermal treatment process for a high-pressure common rail. The process mainly solves the problems that an existing valve bush is poor in abrasion resistance, low in dimensional accuracy and short in service life. The process includes the steps of firstly, stress relief annealing, secondly, carbonitriding, thirdly, quenching treatment, fourthly, washing and drying, fifthly, freezing treatment and sixthly, tempering treatment. By the adoption of the valve bush carbonitriding thermal treatment process, the abrasion resistance of the valve bush is reinforced, the size accuracy of the valve bush is improved, and the service life of the valve bush is prolonged.
Description
Technical field
The present invention relates to a kind of technical field of heat treatment technology, particularly a kind of valve pocket carbonitriding thermal treatment process of high-pressure common rail.
Background technology
The valve pocket (as Fig. 1) of high-pressure common rail is the important spare part of vehicular engine fuel oil injection system, is also a consumable accessory, and it needs to change in time after use wearing and tearing.It is with the process for processing manufacture of ball bearing stee (GCr15) material and is assemblied in the oil pocket of co-rail oil injection body, plays the disposable jet amount controlling fuel oil in vehicular engine fuel oil injection system, promotes the effect of fuel oil detonation rate.Although the structure of high-pressure common rail valve pocket is relatively simple, but install under the Working environment of high pressure (more than 200MPa) due to it and work, need to have excellent wear-resistant, high temperature resistant and impact-resistant feature and the thermostability of valve pocket own dimensions and precision, therefore the many technical qualification such as reliability is high, long service life, demolition and maintenance are convenient that require valve pocket product to have.
With the component of machine that ball bearing stee (GCr15) material manufactures, that applies in bearing industry is the most general, to its effect of heat-treating mainly in order to improve the mechanical property of the aspects such as stability of its hardness and thermotolerance, wear resistance, at high operating temperatures working size and geometrical shape.The thermal treatment process route adopted now is traditional heat treatment step flow process, that is: Spheroidizing Annealing-quenching-tempering.For preventing the decarburization of component in heat treated process, some technique adds shielding gas again in heat treated stove; Also has the technique to adopt prolongation tempering time, with the existence of the component reducing ball bearing stee material residual austenite after heat treatment; The product parts manufactured with ball bearing stee (GCr15) material had, also add the process of freezing treatment in heat treated process.But the above original Technology of all thermal treatment adopted, for increase its valve pocket wear resistance, especially under hot operation state to the stability of valve pocket abrasion resistance, valve pocket size and precision and each side such as to increase the service life, all fundamentally do not solved.
Summary of the invention
For overcoming problems of the prior art, the invention provides a kind of valve pocket carbonitriding thermal treatment process of high-pressure common rail, enhancing the wear resistance of valve pocket, improve the dimensional precision of valve pocket, extend the work-ing life of valve pocket.
The present invention solves the technical scheme that its technical problem takes: the valve pocket carbonitriding thermal treatment process of this kind of high-pressure common rail, is characterized in that comprising the following steps:
Step one, stress relief annealing: the blank station device of the valve pocket of high-pressure common rail is seated in box-type furnace, is heated to 550 ± 10 DEG C with stove, be incubated 150 minutes ~ 180 minutes, after coming out of the stove, air cooling is to room temperature;
Step 2, carbonitriding: the valve sleeve blank part of the high-pressure common rail after processing through step one is put into box gas cementation nitriding furnace; Gases usedly comprise propane, ammonia and methyl alcohol, carbon potential selects 0.85%, and oozing temperature is altogether 860 ± 5 DEG C, oozes 90 minutes time altogether;
Step 3, quench treatment: put into quenching oil when the valve pocket of the high-pressure common rail after carbonitriding is cooled to 840 ± 5 DEG C with stove and cool, Quenching Oil Temperature 60 DEG C, cooling time is 20 minutes;
Step 4, cleaning and drying: the valve sleeve blank part of the high-pressure common rail after quench treatment first uses the metal cleaner solution soaking 10 minutes of 3%, metal cleaner solution temperature 70 ± 10 DEG C, use 3% Sodium Nitrite aqueous rust preventive cleaning showers 5 minutes again, Sodium Nitrite aqueous rust preventive temperature is 70 ± 10 DEG C, draining was come out of the stove after 5 minutes, air cooling 5-10 minute;
Step 5, freezing treatment: be encased in immediately in deep cooling thermostat container by the valve sleeve blank part of the high-pressure common rail cleaned up and carry out sub-zero treatment, design temperature is-130 DEG C, and freezing time is not less than 60 minutes, after taking out, air cooling is to room temperature;
Step 6, temper: the valve sleeve blank part of the high-pressure common rail after freezing treatment is placed on tempering in tempering stove, tempering temperature 260 ± 10 DEG C, tempering time 150 minutes ~ 180 minutes, after being taken out by the blank of high-pressure common rail, air cooling is to room temperature.
Further, in step one, soaking time is 160 minutes.
Further, in step 2, ammonia input speed is 4L/min, and propane input speed is 10L/min, and methyl alcohol input speed is 20L/min.
Further, in step 6, tempering time is 165 minutes.
Further, the valve pocket of described high-pressure common rail is made by GCr15 material.
Further, described station device is the processing block of open top, and the bottom of processing block is plane, bottom processing block and surrounding be engraved structure, described station device is made up of resistant to elevated temperatures stainless steel.
Further, the valve pocket tiling bulk storage of high-pressure common rail is in processing block.
To sum up, the beneficial effect of technique scheme of the present invention is as follows:
(l), because the infiltration infiltration layer transformation temperature of nitrogen reduces, therefore carbonitriding can be carried out at a lower temperature, oozes that rear austenite crystal is unlikely grows up altogether, workpiece is not easily overheated, is convenient to direct quenching, and deflection after quenching is little.
(2), because the effect of oozing of urging of nitrogen makes permeating speed increase, under identical temperature and time condition, the degree of depth of carbonitrided case is much larger than case depth.Namely under identical temperature condition, the speed of carbonitriding is far longer than the speed of carburizing, shortens the heat treated recruitment time.Though the infiltration layer of carbonitriding is comparatively thinner compared with the cementation zone of ordinary process, within the scope of 0.3mm-0.5mm, the service requirements of high-pressure common rail valve pocket can be met.
(3), due to the infiltration of nitrogen reduce the martensitic transformation temperature of infiltration layer, after causing quenching, residual austenite is more, and hardness declines to some extent.Therefore, turn increase sub-zero treatment after quenching, promote austenitic further transformation, make the retention rate of residual austenite below 3%, improve the thermostability of high-pressure common rail valve pocket size and dimension greatly.
(4), because the critical cooling velocity of the infiltration infiltration layer of nitrogen reduces, improve the hardening capacity of infiltration layer, workpiece can be hardened top layer under lower speed of cooling, and reduce quenching strain and tearing tendency.
(5), product quenches after carbonitriding, occurs nitride and nitrogenous needle type martensite, significantly can improve wear resistance and the fatigue resistance of product in infiltration layer.
Accompanying drawing explanation
Fig. 1 is the structural representation of valve pocket;
Fig. 2 is heat treatment cycle curve figure of the present invention;
Fig. 3 is the structural representation of processing block of the present invention;
Fig. 4 is charging mode schematic diagram of the present invention.
Embodiment
Be described in detail to characteristic sum principle of the present invention below in conjunction with accompanying drawing, illustrated embodiment, only for explaining the present invention, not limits protection scope of the present invention with this.
As shown in Figure 2, the carbonitriding thermal treatment process of this valve pocket mainly comprises six steps, is respectively one, stress relief annealing, and two, carbonitriding, three, quench treatment, four, cleaning and dry, five, freezing treatment, six, temper.
Concrete steps are as follows, step one, stress relief annealing: be seated in box-type furnace by the blank station device of the valve pocket of high-pressure common rail, be heated to 550 ± 10 DEG C with stove, and be incubated 150 minutes ~ 180 minutes, after coming out of the stove, air cooling is to room temperature;
Step 2, carbonitriding: the valve sleeve blank part of the high-pressure common rail after processing through step one is put into box gas cementation nitriding furnace; Gases usedly comprise propane, ammonia and methyl alcohol, carbon potential selects 0.85%, and oozing temperature is altogether 860 ± 5 DEG C, oozes 90 minutes time altogether.Infiltration layer transformation temperature reduces, and therefore carbonitriding can be carried out at a lower temperature, oozes that rear austenite crystal is unlikely grows up altogether, and workpiece is not easily overheated, is convenient to direct quenching, and deflection after quenching is little.Depth of penetration and permeating speed increase, and under identical temperature and time condition, the degree of depth of carbonitrided case is much larger than case depth.Namely under identical temperature condition, the speed of carbonitriding is far longer than the speed of carburizing, shortens the heat treated recruitment time.Though the infiltration layer of carbonitriding is comparatively thinner compared with the cementation zone of ordinary process, within the scope of 0.3mm-0.5mm, the service requirements of high-pressure common rail valve pocket can be met.
Step 3, quench treatment: put into quenching oil when the valve pocket of the high-pressure common rail after carbonitriding is cooled to 840 ± 5 DEG C with stove and cool, Quenching Oil Temperature 60 DEG C, cooling time is 20 minutes.Reduce the martensitic transformation temperature of infiltration layer, after causing quenching, residual austenite is more, and hardness declines to some extent.Therefore, turn increase sub-zero treatment after quenching, promote austenitic further transformation, make the retention rate of residual austenite below 3%, improve the thermostability of high-pressure common rail valve pocket size and precision greatly.
Step 4, cleaning and drying: the valve sleeve blank part of the high-pressure common rail after quench treatment first uses the metal cleaner solution soaking 10 minutes of 3%, then uses 3% Sodium Nitrite aqueous rust preventive cleaning showers 5 minutes, and draining was come out of the stove after 5 minutes;
Step 5, freezing treatment: be encased in immediately in deep cooling thermostat container by the valve sleeve blank part of the high-pressure common rail cleaned up and carry out sub-zero treatment, design temperature is-130 DEG C, and freezing time is not less than 60 minutes, after taking out, air cooling is to room temperature;
Step 6, temper: the valve sleeve blank part of the high-pressure common rail after freezing treatment is placed on tempering in tempering stove, tempering temperature 260 ± 10 DEG C, tempering time 150 minutes ~ 180 minutes, after being taken out by the blank of high-pressure common rail, air cooling is to room temperature.
Embodiment one, preferably, in step one, soaking time is 160 minutes.
Embodiment two, preferably, in step 2, ammonia input speed is 4L/min, and propane input speed is 10L/min, and methyl alcohol input speed is 20L/min.
Embodiment three, in preferred step 6, tempering time is 165 minutes.
Further, the valve pocket of described high-pressure common rail is made by GCr15 material.
Further, as shown in Figure 3, Figure 4, described station device is the processing block of open top, for ensureing that the bottom of processing block is plane by the homogeneity of carbonitriding, bottom processing block and surrounding be engraved structure, described station device is made up of resistant to elevated temperatures stainless steel, and the valve pocket tiling bulk storage of high-pressure common rail is in processing block.
Each process of above heat treatment step is all carried out on multipurpose furnace automation line, and by the temperature control of computer predetermined set and sequencing automatic operation, processing parameter all can be monitored from self-registering instrument.
With the high-pressure common rail valve pocket product that ball bearing stee (GCr15) material is manufactured, should reach HRC57 ~ 59 according to design requirements surface hardness, metallographic microstructure is fine acicular martensite (M)+tiny carbide (C) and a small amount of residual austenite (A ').After adopting the technical scheme of thermal treatment process of the present invention, namely the surface hardness of working control can be controlled in the scope of HRC57 ~ 59, meets design requirements completely; Through inspection to metallographic structure, its martensite is fine acicular, hidden needle-like+in the fine uniform carbide of distribution and the residual austenite of minute quantity.The effective hardness layer on high-pressure common rail valve pocket surface can be controlled in 0.3mm ~ 0.5mm, and (rule of thumb analyze, surperficial effective hardness layer is when lower than 0.3mm, and the increase of abrasion resistance value is limited; And when surperficial effective hardness layer is higher than 0.5mm, have again the possibility increasing fragility).So control within the scope of this, the stability of its thermotolerance, wear resistance, at high operating temperatures working size and geometrical shape is best effect.Further, processing by adding " tempering " fully after " sub-zero treatment ", under the microscope of 500X, check metallographic structure, its residual austenite reaches minimum degree substantially.So, the beneficial outcomes improving wear resistance and fatigue resistance can be obtained.
Above-described embodiment is only the description carried out the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; relevant technical staff in the field, to various distortion of the present invention and improvement, all should expand in the determined protection domain of claims of the present invention.
Claims (7)
1. a valve pocket carbonitriding thermal treatment process for high-pressure common rail, is characterized in that comprising the following steps:
Step one, stress relief annealing: the blank station device of the valve pocket of high-pressure common rail is seated in box-type furnace, is heated to 550 ± 10 DEG C with stove, be incubated 150 minutes ~ 180 minutes, after coming out of the stove, air cooling is to room temperature;
Step 2, carbonitriding: the valve sleeve blank part of the high-pressure common rail after processing through step one is put into box gas cementation nitriding furnace; Gases usedly comprise propane, ammonia and methyl alcohol, carbon potential selects 0.85%, and oozing temperature is altogether 860 ± 5 DEG C, oozes 90 minutes time altogether;
Step 3, quench treatment: put into quenching oil when the valve pocket of the high-pressure common rail after carbonitriding is cooled to 840 ± 5 DEG C with stove and cool, Quenching Oil Temperature 60 DEG C, cooling time is 20 minutes;
Step 4, cleaning and drying: the valve sleeve blank part of the high-pressure common rail after quench treatment first uses the metal cleaner solution soaking 10 minutes of 3%, metal cleaner solution temperature 70 ± 10 DEG C, use 3% Sodium Nitrite aqueous rust preventive cleaning showers 5 minutes again, Sodium Nitrite aqueous rust preventive temperature is 70 ± 10 DEG C, draining was come out of the stove after 5 minutes, air cooling 5-10 minute;
Step 5, freezing treatment: be encased in immediately in deep cooling thermostat container by the valve sleeve blank part of the high-pressure common rail cleaned up and carry out sub-zero treatment, design temperature is-130 DEG C, and freezing time is not less than 60 minutes, after taking out, air cooling is to room temperature;
Step 6, temper: the valve sleeve blank part of the high-pressure common rail after freezing treatment is placed on tempering in tempering stove, tempering temperature 260 ± 10 DEG C, tempering time 150 minutes ~ 180 minutes, after being taken out by the blank of high-pressure common rail, air cooling is to room temperature.
2. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 1, is characterized in that: in step one, soaking time is 160 minutes.
3. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 1, it is characterized in that: in step 2, ammonia input speed is 4L/min, propane input speed is 10L/min, and methyl alcohol input speed is 20L/min.
4. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 1, is characterized in that: in step 6, tempering time is 165 minutes.
5. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 1, is characterized in that: the valve pocket of described high-pressure common rail is made by GCr15 material.
6. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 1, it is characterized in that: described station device is the processing block of open top, the bottom of processing block is plane, bottom processing block and surrounding be engraved structure, described station device is made up of resistant to elevated temperatures stainless steel.
7. the valve pocket carbonitriding thermal treatment process of a kind of high-pressure common rail according to claim 6, is characterized in that: the valve pocket tiling bulk storage of high-pressure common rail is in processing block.
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Cited By (10)
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| CN105586565A (en) * | 2016-03-01 | 2016-05-18 | 新昌县海拓轴承有限公司 | Carbonitriding thermal treatment process for strengthening wear resistance of bearing ring |
| CN105624607A (en) * | 2016-01-21 | 2016-06-01 | 重庆金猫纺织器材有限公司 | GHJ (highly-wear-resisting black-gold steel) spinning steel collar machining technology and surface treatment solution |
| CN106191756A (en) * | 2016-08-31 | 2016-12-07 | 人本集团有限公司 | A kind of Technology for Heating Processing improving bearing ring abrasion performance |
| CN106868444A (en) * | 2017-03-29 | 2017-06-20 | 济南弘正科技有限公司 | A kind of clutch outer aggregate surface oxidation processing technique |
| CN107022674A (en) * | 2016-01-29 | 2017-08-08 | 南通宏大机电制造有限公司 | A kind of pair of output shaft magnetic powder clutch is with defeated in/out axis processing technique |
| CN107513601A (en) * | 2017-10-25 | 2017-12-26 | 苏州华丰不锈钢紧固件有限公司 | A kind of heat treatment method for effectively improving steel performance |
| CN108411093A (en) * | 2018-03-26 | 2018-08-17 | 湖南特科能热处理有限公司 | A kind of heat treatment process reducing transfer-case idle shaft gear shifting quadrant texturing |
| CN108823523A (en) * | 2018-07-12 | 2018-11-16 | 中国航发哈尔滨轴承有限公司 | A method of it is modified to taper roller surface using taper roller thermo-chemical treatment special tooling |
| CN111593179A (en) * | 2020-06-03 | 2020-08-28 | 江苏联峰实业有限公司 | Heating method of bearing steel continuous casting billet |
| CN111730292A (en) * | 2020-06-30 | 2020-10-02 | 浙江金森机械有限公司 | Efficient production process of overflow valve sleeve |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105624607A (en) * | 2016-01-21 | 2016-06-01 | 重庆金猫纺织器材有限公司 | GHJ (highly-wear-resisting black-gold steel) spinning steel collar machining technology and surface treatment solution |
| CN107022674A (en) * | 2016-01-29 | 2017-08-08 | 南通宏大机电制造有限公司 | A kind of pair of output shaft magnetic powder clutch is with defeated in/out axis processing technique |
| CN105586565A (en) * | 2016-03-01 | 2016-05-18 | 新昌县海拓轴承有限公司 | Carbonitriding thermal treatment process for strengthening wear resistance of bearing ring |
| CN106191756A (en) * | 2016-08-31 | 2016-12-07 | 人本集团有限公司 | A kind of Technology for Heating Processing improving bearing ring abrasion performance |
| CN106868444A (en) * | 2017-03-29 | 2017-06-20 | 济南弘正科技有限公司 | A kind of clutch outer aggregate surface oxidation processing technique |
| CN107513601A (en) * | 2017-10-25 | 2017-12-26 | 苏州华丰不锈钢紧固件有限公司 | A kind of heat treatment method for effectively improving steel performance |
| CN108411093A (en) * | 2018-03-26 | 2018-08-17 | 湖南特科能热处理有限公司 | A kind of heat treatment process reducing transfer-case idle shaft gear shifting quadrant texturing |
| CN108823523A (en) * | 2018-07-12 | 2018-11-16 | 中国航发哈尔滨轴承有限公司 | A method of it is modified to taper roller surface using taper roller thermo-chemical treatment special tooling |
| CN111593179A (en) * | 2020-06-03 | 2020-08-28 | 江苏联峰实业有限公司 | Heating method of bearing steel continuous casting billet |
| CN111730292A (en) * | 2020-06-30 | 2020-10-02 | 浙江金森机械有限公司 | Efficient production process of overflow valve sleeve |
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