CN105154813A - 20CrMo servo piston heat treatment process - Google Patents

20CrMo servo piston heat treatment process Download PDF

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Publication number
CN105154813A
CN105154813A CN201510572928.1A CN201510572928A CN105154813A CN 105154813 A CN105154813 A CN 105154813A CN 201510572928 A CN201510572928 A CN 201510572928A CN 105154813 A CN105154813 A CN 105154813A
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CN
China
Prior art keywords
temperature
30min
40min
frame
sent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510572928.1A
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Chinese (zh)
Inventor
冯志刚
张笑
蔡中辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WUXI YINGBEI PRECISION BEARING CO Ltd
Original Assignee
WUXI YINGBEI PRECISION BEARING CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WUXI YINGBEI PRECISION BEARING CO Ltd filed Critical WUXI YINGBEI PRECISION BEARING CO Ltd
Priority to CN201510572928.1A priority Critical patent/CN105154813A/en
Publication of CN105154813A publication Critical patent/CN105154813A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20Carburising
    • C23C8/22Carburising of ferrous surfaces

Abstract

The invention relates to a 20CrMo servo piston heat treatment process. The heat treatment process is characterize by comprising the steps of: (1) incoming inspection; (2) clamping; (3) washing; (4) preheating; (5) strong permeation; (6) diffusion; (7) intercooling; (8) heating; (9) quenching; (10) cleaning; (11) ice cooling; (12) air cooling; (13) tempering; and (14) air cooling. The 20CrMo servo piston heat treatment process has the advantages of preferably reducing retained austenite after the heat treatment and improving the part hardness, strength, wear resistance and fatigue resistance.

Description

20CrMo servopiston thermal treatment process
Technical field
The present invention relates to a kind of 20CrMo servopiston thermal treatment process.
Background technology
At present, the high-precision servo piston of domestic production is in work-ing life, and bearing capacity aspect does not all reach requirement.And external product steady quality, long service life, but expensive.Its major cause is that the part that China produces has a large amount of residual austenites, after heat treatment so the hardness of part, intensity, wear resistance and the antifatigue limit all do not reach requirement.
I takes charge of on the basis of comprehensive thermal treatment process both at home and abroad, adopt new equipment and process, give full play to my advantage of department in heat treatment technics and in quality management and control, not only reach the production level of external hydraulic servo piston, and it is short for work-ing life fundamentally to solve hydraulic part, unstable product quality, the problem that bearing capacity does not increase.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, after a kind of thermal treatment is provided, reduce residual austenite preferably, improve the 20CrMo servopiston thermal treatment process of part hardness, intensity, wear resistance and fatigue resistance.
The object of the present invention is achieved like this:
A kind of 20CrMo servopiston thermal treatment process, is characterized in that this thermal treatment process comprises the following steps:
Step one, Incoming Quality Control
Step 2, clamping
Step 3, cleaning
Step 4, preheating
By part preheating 50 ~ 60min, part is preheated to 350 DEG C ~ 400 DEG C;
Step 5, to ooze by force
Hot cell part being delivered to multipurpose furnace is oozed by force, hot cell temperature before feeding part of multipurpose furnace is 870 DEG C ~ 880 DEG C, after entering part, temperature is reduced to 855 DEG C ~ 860 DEG C, at 855 DEG C ~ 860 DEG C insulation 30min ~ 35min, then carry out being warming up to 870 DEG C ~ 880 DEG C through the time of 20min ~ 25min, ooze by force at the temperature of 870 DEG C ~ 880 DEG C, the time of oozing is 80min ~ 90min by force, and carbonization concentration is 1.05%;
Step 6, diffusion
Spread at the temperature of 870 DEG C ~ 880 DEG C, diffusion time is 40min ~ 45min, then after the time of 30min ~ 40min is cooled to 810 DEG C ~ 820 DEG C, is incubated 40min ~ 50min, and whole process keeps carbonization concentration to be 0.85%;
Step 7, in cold
Part being sent into temperature is that the cold house of 20 DEG C ~ 25 DEG C carries out cooling 30min ~ 50min;
Step 8, heating
Part is sent into hot cell by heating, Heating temperature is 810 DEG C ~ 820 DEG C, and heat-up time is 30min ~ 40min, and carbonization concentration is 0.85% again;
Step 9, quenching
Sent in cold house by part and enter oil quenching, quenching temperature is 90 DEG C ~ 100 DEG C, and the cool time is 25min ~ 30min;
Step 10, cleaning
Step 11, ice-cold
Part is sent into and ice-coldly inwardly carries out ice-cold, the temperature of part is cooled to subzero 75 DEG C ~ subzero 80 DEG C by 90min ~ 100min, is then incubated 100min ~ 120min;
Step 12, air cooling
Take out part and cool 100min ~ 120min in atmosphere;
Step 13, tempering
Part is sent into baking oven and carry out tempering, the temperature of part is warming up to 190 DEG C ~ 200 DEG C by 30min ~ 40min, is then incubated 180min ~ 200min;
Cloth is rapid 14, air cooling
Take out part and be cooled to room temperature in atmosphere.
In step 2 clamping process; the top of part is provided with threaded hole; threaded hole inward turning is equipped with protection bolt, and the epimere of protection bolt is provided with horizontal perforation, and the top of material frame is provided with the suspension silk of lateral arrangement; hang the perforation of silk through protection bolt; be provided with multiple isolation frame in material frame, separate part by isolation frame, make between part, to keep a determining deviation; material frame arranges at most three layers from bottom to up, separates between adjacent two layers material frame with porous plate.
Compared with prior art, the invention has the beneficial effects as follows:
In the thermal treatment process of whole 20CrMo servopiston part, final carburized depth reaches 0.4mm ~ 0.8mm.By the heating process of step 8, residual austenite can be reduced by crystal grain thinning, make residual austenite by traditional 15% ~ 20% amount be reduced to amount less than 10%, thus improve thermal treatment quality, improve part hardness, intensity, wear resistance and fatigue resistance.Therefore reduce residual austenite preferably after 20CrMo servopiston thermal treatment process of the present invention has thermal treatment, improve the advantage of part hardness, intensity, wear resistance and fatigue resistance.
Accompanying drawing explanation
Fig. 1 is the clamping schematic diagram of 20CrMo servopiston part.
Wherein:
Part 1, protection bolt 2, material frame 3, suspension silk 4, porous plate 5.
Embodiment
A kind of 20CrMo servopiston thermal treatment process that the present invention relates to, this thermal treatment process comprises the following steps:
Step one, Incoming Quality Control
Whether inspection 20CrMo servopiston part (20CrMo servopiston part is hereinafter referred to as part) quantity conforms to circulating to block with delivery receipt, whether has macroscopic irregularity;
Step 2, clamping
See Fig. 1, the top of part 1 is provided with threaded hole, and threaded hole inward turning is equipped with protection bolt 2, and the epimere of protection bolt 2 is provided with horizontal perforation, and the top of material frame 3 is provided with the suspension silk 4 of lateral arrangement, hangs silk 4 and can select wire, be preferably iron wire.Hang the perforation of silk 4 through protection bolt 2, multiple isolation frame 4 is provided with in material frame 3, part 1 is separated by isolation frame 4, make to keep a determining deviation between part 1, material frame 3 arranges at most three layers from bottom to up, separate with porous plate 5 between adjacent two layers material frame 3, every stove arranges at most three layered material frames 3, and maximum batch is 600 parts;
Step 3, cleaning
Cleaned by part, cleaning process comprises: clean water, a buck, spray, oven dry;
Step 4, preheating
By part preheating 50 ~ 60min, part is preheated to 350 DEG C ~ 400 DEG C;
Step 5, to ooze by force
Hot cell part being delivered to multipurpose furnace is oozed by force, hot cell temperature before feeding part of multipurpose furnace is 870 DEG C ~ 880 DEG C, after entering part, temperature is reduced to 855 DEG C ~ 860 DEG C, at 855 DEG C ~ 860 DEG C insulation 30min ~ 35min, then carry out being warming up to 870 DEG C ~ 880 DEG C through the time of 20min ~ 25min, ooze by force at the temperature of 870 DEG C ~ 880 DEG C, the time of oozing is 80min ~ 90min by force, and carbonization concentration is 1.05%;
Step 6, diffusion
Spread at the temperature of 870 DEG C ~ 880 DEG C, diffusion time is 40min ~ 45min, then after the time of 30min ~ 40min is cooled to 810 DEG C ~ 820 DEG C, is incubated 40min ~ 50min, and whole process keeps carbonization concentration to be 0.85%;
Step 7, in cold
Part being sent into temperature is that the cold house of 20 DEG C ~ 25 DEG C carries out cooling 30min ~ 50min;
Step 8, heating
Part is sent into hot cell by heating, Heating temperature is 810 DEG C ~ 820 DEG C, and heat-up time is 30min ~ 40min, and carbonization concentration is 0.85% again;
Step 9, quenching
Sent in cold house by part and enter oil quenching, quenching temperature is 90 DEG C ~ 100 DEG C, and the cool time is 25min ~ 30min;
Step 10, cleaning
The complete part of quenching is taken out clean water, a buck, spray, oven dry successively;
Step 11, ice-cold
Part is sent into and ice-coldly inwardly carries out ice-cold, the temperature of part is cooled to subzero 75 DEG C ~ subzero 80 DEG C by 90min ~ 100min, is then incubated 100min ~ 120min;
Step 12, air cooling
Take out part and cool 100min ~ 120min in atmosphere;
Step 13, tempering
Part is sent into baking oven and carry out tempering, the temperature of part is warming up to 190 DEG C ~ 200 DEG C by 30min ~ 40min, is then incubated 180min ~ 200min;
Cloth is rapid 14, air cooling
Take out part and be cooled to room temperature in atmosphere.
In the thermal treatment process of whole 20CrMo servopiston part, final carburized depth reaches 0.4mm ~ 0.8mm.By the heating process of step 8, residual austenite can be reduced by crystal grain thinning, make residual austenite by traditional 15% ~ 20% amount be reduced to amount less than 10%, thus improve thermal treatment quality, improve part hardness, intensity, wear resistance and fatigue resistance.

Claims (2)

1. a 20CrMo servopiston thermal treatment process, is characterized in that this thermal treatment process comprises the following steps:
Step one, Incoming Quality Control
Step 2, clamping
Step 3, cleaning
Step 4, preheating
By part preheating 50 ~ 60min, part is preheated to 350 DEG C ~ 400 DEG C;
Step 5, to ooze by force
Hot cell part being delivered to multipurpose furnace is oozed by force, hot cell temperature before feeding part of multipurpose furnace is 870 DEG C ~ 880 DEG C, after entering part, temperature is reduced to 855 DEG C ~ 860 DEG C, at 855 DEG C ~ 860 DEG C insulation 30min ~ 35min, then carry out being warming up to 870 DEG C ~ 880 DEG C through the time of 20min ~ 25min, ooze by force at the temperature of 870 DEG C ~ 880 DEG C, the time of oozing is 80min ~ 90min by force, and carbonization concentration is 1.05%;
Step 6, diffusion
Spread at the temperature of 870 DEG C ~ 880 DEG C, diffusion time is 40min ~ 45min, then after the time of 30min ~ 40min is cooled to 810 DEG C ~ 820 DEG C, is incubated 40min ~ 50min, and whole process keeps carbonization concentration to be 0.85%;
Step 7, in cold
Part being sent into temperature is that the cold house of 20 DEG C ~ 25 DEG C carries out cooling 30min ~ 50min;
Step 8, heating
Part is sent into hot cell by heating, Heating temperature is 810 DEG C ~ 820 DEG C, and heat-up time is 30min ~ 40min, and carbonization concentration is 0.85% again;
Step 9, quenching
Sent in cold house by part and enter oil quenching, quenching temperature is 90 DEG C ~ 100 DEG C, and the cool time is 25min ~ 30min;
Step 10, cleaning
Step 11, ice-cold
Part is sent into and ice-coldly inwardly carries out ice-cold, the temperature of part is cooled to subzero 75 DEG C ~ subzero 80 DEG C by 90min ~ 100min, is then incubated 100min ~ 120min;
Step 12, air cooling
Take out part and cool 100min ~ 120min in atmosphere;
Step 13, tempering
Part is sent into baking oven and carry out tempering, the temperature of part is warming up to 190 DEG C ~ 200 DEG C by 30min ~ 40min, is then incubated 180min ~ 200min;
Cloth is rapid 14, air cooling
Take out part and be cooled to room temperature in atmosphere.
2. a kind of 20CrMo servopiston thermal treatment process according to claim 1, it is characterized in that in step 2 clamping process, the top of part (1) is provided with threaded hole, threaded hole inward turning is equipped with protection bolt (2), the epimere of protection bolt (2) is provided with horizontal perforation, the top of material frame (3) is provided with the suspension silk (4) of lateral arrangement, hang the perforation of silk (4) through protection bolt (2), multiple isolation frame (4) is provided with in material frame (3), part (1) is separated by isolation frame (4), make to keep a determining deviation between part (1), material frame (3) arranges at most three layers from bottom to up, separate with porous plate (5) between adjacent two layers material frame (3).
CN201510572928.1A 2015-09-10 2015-09-10 20CrMo servo piston heat treatment process Pending CN105154813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510572928.1A CN105154813A (en) 2015-09-10 2015-09-10 20CrMo servo piston heat treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510572928.1A CN105154813A (en) 2015-09-10 2015-09-10 20CrMo servo piston heat treatment process

Publications (1)

Publication Number Publication Date
CN105154813A true CN105154813A (en) 2015-12-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112322846A (en) * 2020-11-06 2021-02-05 安徽合力股份有限公司合肥铸锻厂 Clean heat treatment process for 42CrMo material high-strength bolt
CN113106380A (en) * 2021-04-07 2021-07-13 潍坊丰东热处理有限公司 Heat treatment method for metal parts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167551A1 (en) * 2000-06-21 2002-01-02 Iwatani International Corp. Sub-zero heat treatment method of steel
CN101358269A (en) * 2008-09-05 2009-02-04 潍坊潍柴零部件机械有限公司 Carburizing quenching pipeline and technique thereof
CN101660165A (en) * 2009-09-28 2010-03-03 洛阳Lyc轴承有限公司 Heat treatment process of preparing bearing roller by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel
CN101967605A (en) * 2010-11-07 2011-02-09 太原理工大学 Carbide precipitation type rare earth carburizing steel
CN102732821A (en) * 2012-07-16 2012-10-17 鑫光热处理工业(昆山)有限公司 Free-cutting steel part and manufacturing method thereof
CN203360505U (en) * 2013-07-26 2013-12-25 武汉华夏精冲技术有限公司 Heat treatment fixture for components with holes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167551A1 (en) * 2000-06-21 2002-01-02 Iwatani International Corp. Sub-zero heat treatment method of steel
CN101358269A (en) * 2008-09-05 2009-02-04 潍坊潍柴零部件机械有限公司 Carburizing quenching pipeline and technique thereof
CN101660165A (en) * 2009-09-28 2010-03-03 洛阳Lyc轴承有限公司 Heat treatment process of preparing bearing roller by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel
CN101967605A (en) * 2010-11-07 2011-02-09 太原理工大学 Carbide precipitation type rare earth carburizing steel
CN102732821A (en) * 2012-07-16 2012-10-17 鑫光热处理工业(昆山)有限公司 Free-cutting steel part and manufacturing method thereof
CN203360505U (en) * 2013-07-26 2013-12-25 武汉华夏精冲技术有限公司 Heat treatment fixture for components with holes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112322846A (en) * 2020-11-06 2021-02-05 安徽合力股份有限公司合肥铸锻厂 Clean heat treatment process for 42CrMo material high-strength bolt
CN113106380A (en) * 2021-04-07 2021-07-13 潍坊丰东热处理有限公司 Heat treatment method for metal parts

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Application publication date: 20151216