CN107217226A - The nitriding processing technology of sewing-machine foot part - Google Patents
The nitriding processing technology of sewing-machine foot part Download PDFInfo
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- CN107217226A CN107217226A CN201710372361.2A CN201710372361A CN107217226A CN 107217226 A CN107217226 A CN 107217226A CN 201710372361 A CN201710372361 A CN 201710372361A CN 107217226 A CN107217226 A CN 107217226A
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- sewing
- nitriding
- foot part
- machine foot
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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
- C23C8/02—Pretreatment of the material to be coated
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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
- C23C8/08—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 only one element being applied
- C23C8/10—Oxidising
- C23C8/12—Oxidising using elemental oxygen or ozone
- C23C8/14—Oxidising of ferrous surfaces
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses a kind of nitriding processing technology of sewing-machine foot part, including pretreatment process, deairing step, pre-oxidize process, nitriding process and refrigerating work procedure, particularly the processing technology has carried out pre-oxidation process before nitriding process, and rationally control the temperature and time of oxidizing process, so as to generate layer oxide film in workpiece surface, the oxide-film has very strong adsorptivity to nitride, significantly improve the nitrogen content of workpiece surface, increase the nitrogen concentration gradients of workpiece surface, and then nitrogen-atoms is improved to the diffusion velocity of sewing-machine foot part matrix, improve the performances such as the endurance life and wearability on presser feet part surface, extend the service life of presser feet part；In addition, the present invention is cleaned to sewing-machine foot part using supersonic wave cleaning machine in the pretreatment process stage, to remove the greasy dirt on sewing-machine foot part surface, enables to sewing-machine foot part surface to be easier adsorption activity nitrogen-atoms in Nitrizing Treatment.
Description
Technical field
The present invention relates to metal surface technical field of heat treatment, a kind of nitriding processing work of sewing-machine foot part is specifically provided
Skill.
Background technology
Nitriding, the superficial layer for being directed to steel penetrates into the process of nitrogen-atoms.The purpose is to improve the hardness of superficial layer with it is wear-resisting
Property and improve fatigue strength, corrosion resistance etc..
At present, when carrying out gas nitriding heat treatment to material for 56CrNiMoV7 sewing-machine foot part surface, due to
Workpiece casting, without modifier treatment before nitriding, and workpiece hardness is relatively low, and work is processed according to conventional nitriding in short-term
Skill, easily causes that presser feet part case hardness is low, and deep layer depth is shallower, it is impossible to reach high precision technology requirement.
In view of this, it is special to propose the present invention.
The content of the invention
In order to overcome drawbacks described above, the invention provides a kind of nitriding processing technology of sewing-machine foot part, it, which is designed, closes
Reason, it is easy to operate, accelerate nitriding speed, and improve the endurance life and wearability performance of workpiece surface.
The technical scheme that is used to solve its technical problem of the present invention is：A kind of nitriding processing of sewing-machine foot part
Technique, including following procedure of processing：
(1) pretreatment process；Sewing-machine foot part is placed in supersonic wave cleaning machine and cleaned, to remove sewing machine pressure
Greasy dirt on heel piece surface；Then according still further to requirement is shelved, the sewing-machine foot part after cleaning is shelved and nitriding furnace is hung in
It is interior；
(2) deairing step；Check nitriding furnace bell cover it is errorless after, nitriding furnace is heated up, in temperature-rise period
Nitrogen is passed through, to drain the air in nitriding furnace, and controls furnace pressure to be 0.01~0.02Pa simultaneously；
(3) process is pre-oxidized；After the furnace temperature in nitriding furnace is raised to 250~300 DEG C, 1h is incubated；Then nitrogen is turned off
Valve, opens bell so that sewing-machine foot part exposes and leaked in air, now, by the oxygen and furnace temperature in air to sewing
Machine presser feet part carries out 10~20min pre-oxidation treatment；
Pre-oxidation treatment covers bell after terminating, open nitrogen valve, while continue nitriding furnace be warming up to 400~
450 DEG C, it is incubated 1h；
(4) nitriding process；Furnace temperature in nitriding furnace is continuously heating to 500~520 DEG C, closes nitrogen valve and opens ammonia
Air valve, carries out the strong of glow discharge nitriding and oozes process, the resolution ratio of ammonia is set during this as 30~40%, nitriding time is 2
~3h；Ooze after end by force, insulation 30h is diffused；
(5) refrigerating work procedure；After diffusion terminates, open air blower to cool to nitriding furnace, treat the furnace temperature in nitriding furnace
When slow cooling is to 150 DEG C, closes ammonia valve and open nitrogen valve simultaneously；When the furnace temperature slow cooling in nitriding furnace is to 100 DEG C,
Nitrogen valve is closed, the sewing-machine foot part after bell, Nitrizing Treatment is opened and comes out of the stove.
As a further improvement on the present invention, the nitriding furnace uses well formula nitriding furnace.
As a further improvement on the present invention, in above-mentioned steps (2), step (3) and step (5), it is passed through nitrogen
Flow all may be set to 1m3/h。
As a further improvement on the present invention, in above-mentioned steps (4), the flow set for being passed through ammonia is 1.5m3/h。
As a further improvement on the present invention, nitrided case depth of the sewing-machine foot part after Nitrizing Treatment is
0.2mm, superficial hardness number is 670~690HV.
The beneficial effects of the invention are as follows：Compared to conventional nitriding processing technology, nitriding processing technology of the present invention
With advantages below：1. rationally, the processing technology has carried out a pre-oxidation to Design Processing of the present invention before nitriding process
Process, and the rationally temperature and time of control oxidizing process, so as to generate layer oxide film in workpiece surface, the oxide-film has
Very high surface free energy, there is very strong adsorptivity to nitride, significantly improves the nitrogen content of workpiece surface, increases workpiece
The nitrogen concentration gradients on surface, form high concentration difference, and then improve diffusion speed of the nitrogen-atoms to sewing-machine foot part matrix
Spend (improving nitriding speed), improve the performances such as the endurance life and wearability on presser feet part surface, extend presser feet part
Service life；In addition, the setting of the pre-oxidation process stages not only saves modifier treatment process before existing nitriding, and
Without adding any auxiliary equipment during oxidation processes, oxide isolation is air, and then greatly reduces production cost.2. it is of the invention
In the pretreatment process stage, sewing-machine foot part is cleaned using supersonic wave cleaning machine, to remove sewing-machine foot part table
Greasy dirt on face；Ultrasonic cleaning technology is a kind of complicated physics, chemical action process, enables to sewing-machine foot part table
Face is easier adsorption activity nitrogen-atoms in Nitrizing Treatment.3. the present invention uses well formula nitriding furnace, and the well formula nitriding furnace is also matched somebody with somebody
It is equipped with a PLC accurately to control temperature, time, gas flow of nitriding processing technology etc., and then effective ensure that adds
Work precision, improves the crudy of workpiece.
Brief description of the drawings
Fig. 1 is the process chart of the nitriding processing technology of sewing-machine foot part of the present invention；
Fig. 2 be the gained Nitrizing Treatment of the embodiment of the present invention 1 after sewing-machine foot part 100 × metallograph；
Fig. 3 be the gained Nitrizing Treatment of the embodiment of the present invention 1 after sewing-machine foot part 500 × metallograph.
Embodiment
The present invention is described in further details with reference to specific embodiment, but the invention is not restricted to these implementations
Example.
The invention discloses a kind of nitriding processing technology of sewing-machine foot part, the Design Processing is reasonable, easy to operate,
Nitriding speed is accelerated, and improves the endurance life and wearability performance of workpiece surface.It is described as follows：
Embodiment 1：
A kind of nitriding processing technology of sewing-machine foot part, including following procedure of processing：
(1) pretreatment process；Material is placed in supersonic wave cleaning machine for 56CrNiMoV7 sewing-machine foot part and carried out
Cleaning, to remove the greasy dirt on sewing-machine foot part surface；Then according still further to requirement is shelved, by the sewing-machine foot part after cleaning
Shelve and hang in model RN-75-6 well formula nitriding furnace；
(2) deairing step；Check nitriding furnace bell cover it is errorless after, nitriding furnace is heated up, in temperature-rise period
The nitrogen that purity is more than 99.99% is passed through, to drain the air in nitriding furnace, the flow set of nitrogen is 1m3/ h, and simultaneously
It is 0.01Pa to control furnace pressure；
(3) process is pre-oxidized；After the furnace temperature in nitriding furnace is raised to 300 DEG C, 1h is incubated, to ensure sewing-machine foot part
Temperature also reaches 300 DEG C；Then nitrogen valve is turned off, bell is opened so that sewing-machine foot part exposes and leaked in air, this
When, 20min pre-oxidation treatment is carried out to sewing-machine foot part by the oxygen and furnace temperature in air；After pre-oxidation treatment terminates
Bell is covered, opening nitrogen valve, (flow set of nitrogen is 1m3/ h), while continue that nitriding furnace is carried out to be warming up to 450 DEG C,
It is incubated 1h；
(4) nitriding process；Furnace temperature in nitriding furnace is continuously heating to 520 DEG C, closes nitrogen valve and opens ammonia valve
(ammonia purity is more than 99.99%), carries out the strong of glow discharge nitriding and oozes process, the flow of ammonia is set during this as 1.5m3/
H, the resolution ratio of ammonia is 35%, and nitriding time is 2h；Ooze after end by force, insulation 30h is diffused；
(5) refrigerating work procedure；After diffusion terminates, open air blower to cool to nitriding furnace, treat the furnace temperature in nitriding furnace
When slow cooling is to 150 DEG C, (flow set of nitrogen is 1m for closing ammonia valve and simultaneously opening nitrogen valve3/h)；Work as nitriding furnace
When interior furnace temperature slow cooling is to 100 DEG C, nitrogen valve is closed, the sewing-machine foot part after bell, Nitrizing Treatment is opened and comes out of the stove.
Metallographic Analysis is carried out to the sewing-machine foot part after the gained Nitrizing Treatment of embodiment 1, show that nitrided case depth is
0.2mm, meets 56CrNiMoV7 steel nitrided case depth for " 0.1~0.2mm " technical requirements.
Embodiment 2：
A kind of nitriding processing technology of sewing-machine foot part, including following procedure of processing：
(1) pretreatment process；Material is placed in supersonic wave cleaning machine for 56CrNiMoV7 sewing-machine foot part and carried out
Cleaning, to remove the greasy dirt on sewing-machine foot part surface；Then according still further to requirement is shelved, by the sewing-machine foot part after cleaning
Shelve and hang in model RN-75-6 well formula nitriding furnace；
(2) deairing step；Check nitriding furnace bell cover it is errorless after, nitriding furnace is heated up, in temperature-rise period
The nitrogen that purity is more than 99.99% is passed through, to drain the air in nitriding furnace, the flow set of nitrogen is 1m3/ h, and simultaneously
It is 0.02Pa to control furnace pressure；
(3) process is pre-oxidized；After the furnace temperature in nitriding furnace is raised to 300 DEG C, 1h is incubated, to ensure sewing-machine foot part
Temperature also reaches 300 DEG C；Then nitrogen valve is turned off, bell is opened so that sewing-machine foot part exposes and leaked in air, this
When, 15min pre-oxidation treatment is carried out to sewing-machine foot part by the oxygen and furnace temperature in air；After pre-oxidation treatment terminates
Bell is covered, opening nitrogen valve, (flow set of nitrogen is 1m3/ h), while continue that nitriding furnace is carried out to be warming up to 430 DEG C,
It is incubated 1h；
(4) nitriding process；Furnace temperature in nitriding furnace is continuously heating to 510 DEG C, closes nitrogen valve and opens ammonia valve
(ammonia purity is more than 99.99%), carries out the strong of glow discharge nitriding and oozes process, the flow of ammonia is set during this as 1.5m3/
H, the resolution ratio of ammonia is 33%, and nitriding time is 2.5h；Ooze after end by force, insulation 30h is diffused；
(5) refrigerating work procedure；After diffusion terminates, open air blower to cool to nitriding furnace, treat the furnace temperature in nitriding furnace
When slow cooling is to 150 DEG C, (flow set of nitrogen is 1m for closing ammonia valve and simultaneously opening nitrogen valve3/h)；Work as nitriding furnace
When interior furnace temperature slow cooling is to 100 DEG C, nitrogen valve is closed, the sewing-machine foot part after bell, Nitrizing Treatment is opened and comes out of the stove.
Metallographic Analysis is carried out to the sewing-machine foot part after the gained Nitrizing Treatment of embodiment 2, show that nitrided case depth is
0.19mm, meets 56CrNiMoV7 steel nitrided case depth for " 0.1~0.2mm " technical requirements.
Embodiment 3：
A kind of nitriding processing technology of sewing-machine foot part, including following procedure of processing：
(1) pretreatment process；Material is placed in supersonic wave cleaning machine for 56CrNiMoV7 sewing-machine foot part and carried out
Cleaning, to remove the greasy dirt on sewing-machine foot part surface；Then according still further to requirement is shelved, by the sewing-machine foot part after cleaning
Shelve and hang in model RN-75-6 well formula nitriding furnace；
(2) deairing step；Check nitriding furnace bell cover it is errorless after, nitriding furnace is heated up, in temperature-rise period
The nitrogen that purity is more than 99.99% is passed through, to drain the air in nitriding furnace, the flow set of nitrogen is 1m3/ h, and simultaneously
It is 0.01Pa to control furnace pressure；
(3) process is pre-oxidized；After the furnace temperature in nitriding furnace is raised to 280 DEG C, 1h is incubated, to ensure sewing-machine foot part
Temperature also reaches 280 DEG C；Then nitrogen valve is turned off, bell is opened so that sewing-machine foot part exposes and leaked in air, this
When, 20min pre-oxidation treatment is carried out to sewing-machine foot part by the oxygen and furnace temperature in air；After pre-oxidation treatment terminates
Bell is covered, opening nitrogen valve, (flow set of nitrogen is 1m3/ h), while continue that nitriding furnace is carried out to be warming up to 440 DEG C,
It is incubated 1h；
(4) nitriding process；Furnace temperature in nitriding furnace is continuously heating to 520 DEG C, closes nitrogen valve and opens ammonia valve
(ammonia purity is more than 99.99%), carries out the strong of glow discharge nitriding and oozes process, the flow of ammonia is set during this as 1.5m3/
H, the resolution ratio of ammonia is 37%, and nitriding time is 3h；Ooze after end by force, insulation 30h is diffused；
(5) refrigerating work procedure；After diffusion terminates, open air blower to cool to nitriding furnace, treat the furnace temperature in nitriding furnace
When slow cooling is to 150 DEG C, (flow set of nitrogen is 1m for closing ammonia valve and simultaneously opening nitrogen valve3/h)；Work as nitriding furnace
When interior furnace temperature slow cooling is to 100 DEG C, nitrogen valve is closed, the sewing-machine foot part after bell, Nitrizing Treatment is opened and comes out of the stove.
Metallographic Analysis is carried out to the sewing-machine foot part after the gained Nitrizing Treatment of embodiment 3, show that nitrided case depth is
0.2mm, meets 56CrNiMoV7 steel nitrided case depth for " 0.1~0.2mm " technical requirements.
In addition, according to professional standard, entering respectively to the sewing-machine foot part after the gained Nitrizing Treatment of above-described embodiment 1~3
Row case hardness is detected.Wherein, the technical parameter of case hardness detection is：Instrument number：HV-1000；Test force：5000Kgf；Power
Retention time 10s.Test result is as shown in table 1：
Table 1：The superficial hardness number of sewing-machine foot part after the gained Nitrizing Treatment of the embodiment of the present invention 1~3
It can be seen in table 1 that the superficial hardness number of the sewing-machine foot part after the gained Nitrizing Treatment of the embodiment of the present invention 1~3,
56CrNiMoV7 steel surfaces hardness is all met for " 670~770HV " technical requirements.
In summary, the present invention with the addition of by carrying out technological innovation to nitriding processing technology before nitriding process
One pre-oxidation process, and the rationally temperature and time of control oxidizing process, not only increase nitriding speed, improve workpiece surface
Endurance life and the performance such as wearability；Production cost is also greatly reduced, is implemented beneficial to production.
Above-mentioned lifted embodiment only to the composition and effect that illustrate the present invention, not thereby carrys out to arrest the special of the limit present invention
Sharp scope, thus such as the change of all equivalent structures and do not depart from the present invention similar modification, be under the jurisdiction of the present invention patent
Category.
Claims (5)
1. a kind of nitriding processing technology of sewing-machine foot part, it is characterised in that：Including following procedure of processing：
(1) pretreatment process；Sewing-machine foot part is placed in supersonic wave cleaning machine and cleaned, to remove sewing-machine foot part
Greasy dirt on surface；Then according still further to requirement is shelved, the sewing-machine foot part after cleaning is shelved and hung in nitriding furnace；
(2) deairing step；Check nitriding furnace bell cover it is errorless after, nitriding furnace is heated up, is passed through in temperature-rise period
Nitrogen, to drain the air in nitriding furnace, and controls furnace pressure to be 0.01~0.02Pa simultaneously；
(3) process is pre-oxidized；After the furnace temperature in nitriding furnace is raised to 250~300 DEG C, 1h is incubated；Then nitrogen valve is turned off,
Open bell so that sewing-machine foot part exposes and leaked in air, now, by the oxygen and furnace temperature in air to sewing-machine foot
Part carries out 10~20min pre-oxidation treatment；
Pre-oxidation treatment covers bell after terminating, open nitrogen valve, while continuing that nitriding furnace is carried out to be warming up to 400~450
DEG C, it is incubated 1h；
(4) nitriding process；Furnace temperature in nitriding furnace is continuously heating to 500~520 DEG C, closes nitrogen valve and opens ammonia valve
Door, carries out the strong of glow discharge nitriding and oozes process, the resolution ratio of ammonia is set during this as 30~40%, nitriding time is 2~3h；
Ooze after end by force, insulation 30h is diffused；
(5) refrigerating work procedure；After diffusion terminates, open air blower to cool to nitriding furnace, treat the furnace temperature slow cooling in nitriding furnace
During to 150 DEG C, close ammonia valve and open nitrogen valve simultaneously；When the furnace temperature slow cooling in nitriding furnace is to 100 DEG C, close
Nitrogen valve, opens the sewing-machine foot part after bell, Nitrizing Treatment and comes out of the stove.
2. the nitriding processing technology of sewing-machine foot part according to claim 1, it is characterised in that：The nitriding furnace is used
Well formula nitriding furnace.
3. the nitriding processing technology of sewing-machine foot part according to claim 1, it is characterised in that：Above-mentioned steps (2),
In step (3) and step (5), the flow for being passed through nitrogen all may be set to 1m3/h。
4. the nitriding processing technology of sewing-machine foot part according to claim 1, it is characterised in that：In above-mentioned steps (4)
In, the flow set for being passed through ammonia is 1.5m3/h。
5. according to the nitriding processing technology of sewing-machine foot part according to any one of claims 1 to 4, it is characterised in that：Institute
Nitrided case depth of the sewing-machine foot part after Nitrizing Treatment is stated for 0.2mm, superficial hardness number is 670~690HV.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710372361.2A CN107217226A (en) | 2017-05-24 | 2017-05-24 | The nitriding processing technology of sewing-machine foot part |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710372361.2A CN107217226A (en) | 2017-05-24 | 2017-05-24 | The nitriding processing technology of sewing-machine foot part |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0228380A (en) * | 1988-06-15 | 1990-01-30 | Seiko Instr Inc | Manufacture of semiconductor nonvolatile memory |
| CN105385981A (en) * | 2015-12-10 | 2016-03-09 | 常州天山重工机械有限公司 | Thermal treatment process for effectively controlling nitrides of gear material |
| CN105586564A (en) * | 2015-12-25 | 2016-05-18 | 上海人本集团有限公司 | Cooling process for nitriding steel nitrogen treatment |
-
2017
- 2017-05-24 CN CN201710372361.2A patent/CN107217226A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0228380A (en) * | 1988-06-15 | 1990-01-30 | Seiko Instr Inc | Manufacture of semiconductor nonvolatile memory |
| CN105385981A (en) * | 2015-12-10 | 2016-03-09 | 常州天山重工机械有限公司 | Thermal treatment process for effectively controlling nitrides of gear material |
| CN105586564A (en) * | 2015-12-25 | 2016-05-18 | 上海人本集团有限公司 | Cooling process for nitriding steel nitrogen treatment |
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