CN110438440A - A kind of glow discharge nitriding duplex surface modification processing method - Google Patents
A kind of glow discharge nitriding duplex surface modification processing method Download PDFInfo
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- CN110438440A CN110438440A CN201910814136.9A CN201910814136A CN110438440A CN 110438440 A CN110438440 A CN 110438440A CN 201910814136 A CN201910814136 A CN 201910814136A CN 110438440 A CN110438440 A CN 110438440A
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- glow discharge
- nitriding
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C8/00—Solid 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
- C23C8/06—Solid 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
- C23C8/36—Solid 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 using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of glow discharge nitriding duplex surface modification processing methods, comprise the following methods: a, carry out cutting processing, cutting processing selection laser cutting to steel first, and be processed by shot blasting to surface；Workpiece after cutting is carried out high-temperature heating treatment by b；Plate after heat treatment is sent into vacuum drying oven and carries out Nitrizing Treatment by c；D carries out normalizing to the plate after the completion of nitriding and tempering is processed, then naturally cool to room temperature, completes processing.The invention patent permeating speed is fast, without special heating and heat-preserving equipment, and can obtain uniform Temperature Distribution, heating efficiency can be improved twice or more compared with indirect heating manner, reach energy-saving effect, processing cost can be substantially reduced, nitriding structure is easily controllable, by adjusting nitrogen, oxygen, hydrogen and the ratio of other atmosphere, can freely modulating compound layer composition, to obtain expected mechanical performance, adaptation range is extensive, and pollution waste is less, it is more environmentally friendly.
Description
Technical field
The present invention relates to glow discharge nitriding technical field, especially a kind of glow discharge nitriding duplex surface modification processing method.
Background technique
Glow discharge nitriding is in the nitrogen containing atmosphere of low vacuum, and using furnace body as anode, processed workpiece is cathode, in anode and cathode
Between add the DC voltages of hundreds of volts, be allowed to generate the chemical heat treatment process that glow discharge carries out Nitrizing Treatment.Glow discharge nitriding
There are many titles, such as ionic nitriding, glow discharge nitriding, ion bombardment nitriding, plasma nitridation.
Glow discharge nitriding is carried out in vacuum chamber, and workpiece connects the cathode of high-voltage DC power supply, singly connects anode in vacuum.It will
After the vacuum degree of vacuum chamber is extracted into 10Pa, it is filled with the mixed gas of a small amount of nitrogen or hydrogen, nitrogen.When voltage is adjusted to 400-
When 800V, nitrogen ionizes and resolves into Nitrogen ion, hydrogen ion and electronics, and generates glow discharge phenomenon in workpiece surface.Cation
Accelerated bombardment workpiece surface by electric field action, workpiece is made to be warming up to nitriding temperature.Nitrogen ion obtains electronics, reduction in steel piece surface
Steel piece surface is penetrated at nitrogen-atoms and is internally spread, and nitriding layer is formed.Glow discharge nitriding processing technique efficiency traditional at present
It is lower, and treated that steel flatness is poor, for above problem, herein it is proposed that a kind of glow discharge nitriding composite table
Face modification processing method.
Summary of the invention
The present invention is to solve above-mentioned phenomenon, using the technical solution of following modification, a kind of glow discharge nitriding duplex surface modification
Processing method comprises the following methods that a carries out cutting processing to steel first, and cutting processing selection is cut by laser, and right
Surface is processed by shot blasting；
Workpiece after cutting is carried out high-temperature heating treatment by b；
Plate after heat treatment is sent into vacuum drying oven and carries out Nitrizing Treatment by c；
D carries out normalizing to the plate after the completion of nitriding and tempering is processed, then naturally cool to room temperature, completes processing.
As a kind of preferred embodiment of the invention, in step a, cutting includes the following steps, using finite element analysis
Software creates workpiece numerical simulator using CAD or UG modeling；The wavelength of the laser of the laser control system output
It is 12.4 μm -32.6 μm, power 80W-420W, frequency 180MHz, the distance between laser output unit and workbench
For 0cm-45cm.
As a kind of preferred embodiment of the invention, heating process includes the following steps in step b, in auxiliary oven
It is heated, temperature is controlled at 1000-1200 DEG C, and reduction period needs to reinforce deoxidation operation, and it is 98% that purity is added into furnace
V, the alloying element of W, Mo, Cr carries out fash, burr, riser at removing surface removal die joint and core print after the completion of heating
Trace is cut off, is then surface-treated.
As a kind of preferred embodiment of the invention, in step c, using nitrogen, oxygen, hydrogen gas mixture, nitrogen
Flow with hydrogen is respectively 180ml/min and 720ml/min, and oxygen is set as 50ml/min, and gas pressure is maintained at 500Pa,
Temperature is 650 DEG C, time 1.8h.
As present invention further optimization mode, in step c, the vacuum drying oven holding stage current density is 0.5-
5mA/cm2, voltage 600-700V.
As a kind of preferred embodiment of the invention, in step d, the normalizing process carries out Ovshinsky within the scope of room temperature
Bodyization processing, is then kept the temperature, and soaking time is determined according to part effective thickness；Workpiece after heat preservation is quickly put into flowing
Water based suspension hardening media in it is cooling, then take out stop in air, above-mentioned cooling and holding process be repeated several times；Just
Fire: it puts the workpiece in resistance furnace, is kept the temperature under normalizing temperature；It is cooling: the workpiece after normalizing being taken out, is cooled in air
Room temperature.
As a kind of preferred embodiment of the invention, the tempering process includes hereinafter, firstly, reaching in tempering heating
Start vaccum-pumping equipment before 200 DEG C to tempering stove evacuation, removes air；Secondly, filling indifferent gas when furnace temperature rises to 200 DEG C
Then body starts circulating fan heating tempering into flue, need to guarantee that inert gas pressure is greater than atmospheric pressure in furnace in the process
Power, and keep stable；Finally, bleeding off the inert gas of heat after tempering, then filling with inert gas argon gas is cooled to 400 DEG C
When, workpiece is come out of the stove air-cooled.
Compared with prior art: the invention patent permeating speed is fast, since the gas ionized is utilized in ionitriding
The sputtering of body acts on, thus shortens the processing time with can dramatically, and energy consumption is few, since ionitriding is straight using glow discharge
It connects and workpiece is heated, without special heating and heat-preserving equipment, and uniform Temperature Distribution can be obtained, add with indirect
Hot mode can be improved twice or more compared to heating efficiency, reaches energy-saving effect, can substantially reduce processing cost, nitriding structure is easy to
Control, by adjust nitrogen, oxygen, hydrogen and other atmosphere ratio, can freely modulating compound layer composition, to obtain expection
Mechanical performance, adaptation range is extensive, and it is less to pollute waste, more environmentally friendly.
Specific embodiment
Below in conjunction in the embodiment of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
The present invention provides a kind of technical solution: a kind of glow discharge nitriding duplex surface modification processing method, including following methods
Step, a carry out cutting processing, cutting processing selection laser cutting to steel first, and are processed by shot blasting to surface；
Workpiece after cutting is carried out high-temperature heating treatment by b；
Plate after heat treatment is sent into vacuum drying oven and carries out Nitrizing Treatment by c；
D carries out normalizing to the plate after the completion of nitriding and tempering is processed, then naturally cool to room temperature, completes processing.
In step a, cutting includes the following steps, using finite element analysis software, creates work using CAD or UG modeling
Part numerical simulator；The wavelength of the laser of the laser control system output is 12.4 μm -32.6 μm, power 80W-
420W, frequency 180MHz, the distance between laser output unit and workbench are 0cm-45cm.
Heating process includes the following steps in step b, is heated in auxiliary oven, and temperature is controlled in 1000-1200
DEG C, reduction period needs to reinforce deoxidation operation, and the alloying element of V, W, Mo, Cr that purity is 98% are added into furnace, and heating is completed
The fash at removing surface removal die joint and core print, burr, riser are carried out afterwards and cuts off trace, are then surface-treated.
In step c, using nitrogen, oxygen, hydrogen gas mixture, the flow of nitrogen and hydrogen be respectively 180ml/min and
720ml/min, oxygen are set as 50ml/min, and gas pressure is maintained at 500Pa, and temperature is 650 DEG C, time 1.8h.
In step c, the vacuum drying oven holding stage current density is 0.5-5mA/cm2, voltage 600-700V.
In step d, the normalizing process carries out austenitizing processing within the scope of room temperature, is then kept the temperature, when heat preservation
Between according to part effective thickness determine；Workpiece after heat preservation is quickly put into cooling in flowing water base suspension hardening media,
It then takes out stop in air, above-mentioned cooling and holding process is repeated several times；Normalizing: putting the workpiece in resistance furnace, just
It is kept the temperature at fiery temperature；It is cooling: the workpiece after normalizing being taken out, is cooled to room temperature in air.
The tempering process includes hereinafter, firstly, starting vaccum-pumping equipment is to tempering furnace before tempering heating reaches 200 DEG C
It vacuumizes, removes air；Secondly, when furnace temperature rises to 200 DEG C then filling with inert gas starts circulating fan heating into flue
Tempering needs to guarantee that in the process inert gas pressure is greater than atmospheric pressure in furnace, and keeps stable；Finally, tempering terminates
The inert gas of heat is bled off afterwards, then when filling with inert gas argon gas is cooled to 400 DEG C, workpiece is come out of the stove air-cooled.
Method data form of the invention is as follows: table 1
| Steel | Processing is time-consuming | Elongation | Tensile strength | Product hardness |
| 10m2 | 8-12h | 62% | ≧535MPa | 98HRB |
Traditional method table is as follows: table 2
| Steel | Processing is time-consuming | Elongation | Tensile strength | Product hardness |
| 10m2 | 10-18h | 57% | ≧510MPa | 92HRB |
To sum up, the invention patent permeating speed is fast, since the sputtering that the gas ionized is utilized in ionitriding is made
With, thus with can dramatically shorten processing the time, energy consumption is few, due to ionitriding using glow discharge directly to workpiece into
Row heating without special heating and heat-preserving equipment, and can obtain uniform Temperature Distribution, compared with indirect heating manner
Heating efficiency can be improved twice or more, reach energy-saving effect, can substantially reduce processing cost, and nitriding structure is easily controllable, passes through
Adjust nitrogen, oxygen, hydrogen and other atmosphere ratio, can freely modulating compound layer composition, to obtain expected mechanicalness
Can, adaptation range is extensive, and pollution waste is less, more environmentally friendly.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from spirit of the invention or
In the case where essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention
It is interior.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of glow discharge nitriding duplex surface modification processing method, comprises the following methods, it is characterised in that: a, first to steel
Material carries out cutting processing, cutting processing selection laser cutting, and is processed by shot blasting to surface；
Workpiece after cutting is carried out high-temperature heating treatment by b；
Plate after heat treatment is sent into vacuum drying oven and carries out Nitrizing Treatment by c；
D carries out normalizing to the plate after the completion of nitriding and tempering is processed, then naturally cool to room temperature, completes processing.
2. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that in step a,
Cutting includes the following steps, using finite element analysis software, creates workpiece numerical simulator using CAD or UG modeling；
The wavelength of the laser of the laser control system output is 12.4 μm -32.6 μm, power 80W-420W, frequency 180MHz,
The distance between laser output unit and workbench are 0cm-45cm.
3. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that in step b
Heating process includes the following steps, is heated in auxiliary oven, and at 1000-1200 DEG C, reduction period needs to add for temperature control
The alloying element of V, W, Mo, Cr that purity is 98% are added into furnace, carries out removing surface after the completion of heating and goes for strong deoxidation operation
Except fash, burr, the riser at die joint and core print cut off trace, then it is surface-treated.
4. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that in step c,
Using nitrogen, oxygen, hydrogen gas mixture, the flow of nitrogen and hydrogen is respectively 180ml/min and 720ml/min, and oxygen is set
For 50ml/min, gas pressure is maintained at 500Pa, and temperature is 650 DEG C, time 1.8h.
5. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that in step c,
The vacuum drying oven holding stage current density is 0.5-5mA/cm2, voltage 600-700V.
6. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that in step d,
The normalizing process carries out austenitizing processing within the scope of room temperature, is then kept the temperature, soaking time is effectively thick according to part
Degree determines；Workpiece after heat preservation is quickly put into cooling in flowing water base suspension hardening media, then takes out and rests on sky
In gas, above-mentioned cooling and holding process is repeated several times；Normalizing: putting the workpiece in resistance furnace, keeps the temperature under normalizing temperature；It is cold
But: the workpiece after normalizing being taken out, is cooled to room temperature in air.
7. a kind of glow discharge nitriding duplex surface modification processing method according to claim 1, which is characterized in that the tempering
Process includes hereinafter, firstly, starting vaccum-pumping equipment removes air to tempering stove evacuation before tempering heating reaches 200 DEG C；
Secondly, when furnace temperature rises to 200 DEG C then filling with inert gas starts circulating fan heating tempering, needs in the process into flue
Guarantee that inert gas pressure is greater than atmospheric pressure in furnace, and keeps stable；Finally, bleeding off the indifferent gas of heat after tempering
Body, then when filling with inert gas argon gas is cooled to 400 DEG C, workpiece is come out of the stove air-cooled.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111058530A (en) * | 2019-12-30 | 2020-04-24 | 广州梅隆金属制品有限公司 | Stainless steel structural member and machining process thereof |
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| CN1556243A (en) * | 2004-01-09 | 2004-12-22 | 重庆大学 | Air ion cxygen nitrogen coinfiltration technology of ferrous metal |
| CN104313257A (en) * | 2014-10-31 | 2015-01-28 | 昆山尤特威热处理有限公司 | Modified tempering furnace and tempering method |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN107794532A (en) * | 2017-11-10 | 2018-03-13 | 徐州华瑞机械锻造有限公司 | A kind of heat treatment method of gear |
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2019
- 2019-08-30 CN CN201910814136.9A patent/CN110438440A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556243A (en) * | 2004-01-09 | 2004-12-22 | 重庆大学 | Air ion cxygen nitrogen coinfiltration technology of ferrous metal |
| CN104313257A (en) * | 2014-10-31 | 2015-01-28 | 昆山尤特威热处理有限公司 | Modified tempering furnace and tempering method |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN107794532A (en) * | 2017-11-10 | 2018-03-13 | 徐州华瑞机械锻造有限公司 | A kind of heat treatment method of gear |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111058530A (en) * | 2019-12-30 | 2020-04-24 | 广州梅隆金属制品有限公司 | Stainless steel structural member and machining process thereof |
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