CN106594231A - Worm wheel jack - Google Patents

Worm wheel jack Download PDF

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Publication number
CN106594231A
CN106594231A CN201611177383.5A CN201611177383A CN106594231A CN 106594231 A CN106594231 A CN 106594231A CN 201611177383 A CN201611177383 A CN 201611177383A CN 106594231 A CN106594231 A CN 106594231A
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CN
China
Prior art keywords
worm
worm screw
gear
incubated
carburizing
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Application number
CN201611177383.5A
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Chinese (zh)
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CN106594231B (en
Inventor
唐坤瑞
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TA TA TECHNOLOGY (NINGGUO) Co Ltd
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TA TA TECHNOLOGY (NINGGUO) Co Ltd
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Priority to CN201611177383.5A priority Critical patent/CN106594231B/en
Publication of CN106594231A publication Critical patent/CN106594231A/en
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Publication of CN106594231B publication Critical patent/CN106594231B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • 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
    • C23C8/20—Carburising
    • 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
    • C23C8/24—Nitriding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/18—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through worm gearings

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a worm wheel jack. The worm wheel jack uses a worm wheel and a worm rod as power transmission parts. The worm wheel jack uses the treated worm wheel and worm rod as the transmission parts, so that the loading capacity of a traditional worm wheel jack is greatly improved.

Description

A kind of worm-gear type jack
Technical field
The present invention relates to jack field, more particularly to a kind of worm-gear type jack.
Background technology
Jack be one kind rigid top lift part as equipment, pushed up in stroke by top bracket or bottom claw Rise the light little crane gear of weight.Existing worm-gear type jack structure is although fairly simple, but, its existing snail for adopting Wheel is untreated with worm screw, and the long-term power-transmitting part for being used for jack is used, and damage easily occurs, cause jack without Method is continuing with, also, existing worm and gear, used as the power-transmitting part of jack, range of application is narrow, supported weight compared with Little, work efficiency is slower, rise it is slow, under slow down.
The content of the invention
It is an object of the invention to provide a kind of worm-gear type jack, is achieved through the following technical solutions：
A kind of worm-gear type jack, by worm gear, worm screw as power-transmitting part, the worm screw through Carburization Treatment, the snail Wheel is through Nitrizing Treatment.
Further, equivalent friction angle of the lead angle of described worm screw less than engagement wheel between cog.
Further, the worm screw through Carburization Treatment, processing method includes：
A. worm screw entirety Carburization Treatment:Worm screw is placed in into temperature to be incubated in 900-920 DEG C, the carburizing medium A that carbon potential is 1.4% 4 hours, 30min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in into temperature for 900-920 DEG C, the carburizing that carbon potential is 1.0% 2 hours are incubated in medium B, 15min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in into temperature for 900-920 DEG C, carbon potential To be incubated 1 hour in 0.8% carburizing medium C, 10min is incubated at being subsequently placed in 960 DEG C, then carries out slow cooling, temperature retention time For 60min；Described carburizing medium A is methanol and propane, and described carburizing medium B is methanol, and the carburizing medium C is third Alkane；
B. worm screw integrally micro carburizing and quenching process：Carbon potential is 0.62-0.68% in stove when micro carburizing and quenching is processed, during quenching Between be 90-98min, hardening heat be 860-870 DEG C, depth of hardening is 1.25mm, then worm screw is placed on into 120-130 DEG C Lower insulation 4 hours, is cooled to room temperature.The present invention can greatly improve worm screw face to the Carburization Treatment that worm screw is carried out Concentration of carbon, and carbon content distribution is uniform, and carburizing thickness is uniform, so as to greatly improve worm screw face macrohardness and Case hardness, and the residual stress in worm screw can also be eliminated, greatly improve the service life of worm screw, experimental result table Bright, the macroscopic thickness of the worm screw after present invention process is 0.80-1.1mm, and the hardness at 0.15mm is more than 780HV.
Further, through Nitrizing Treatment, processing method includes the worm gear：
A. by worm gear at 155-168 DEG C isothermal holding 2 hours, be subsequently cooled to room temperature；
B. the worm gear to processing in step a carries out Nitrizing Treatment, and worm gear is placed into into the sodium carbonate liquor that mass concentration is 0.25% Middle immersion 30min, then filters, and is washed using 90 DEG C of clear water, and then drying carries out surface and uniformly beat using 500 mesh sand paper again Mill, then worm gear is placed in nitriding furnace, air in nitriding furnace is excluded totally, nitrogen and ammonia are passed through, nitriding furnace is carried out to add Heat, the resolution ratio of ammonia is controlled between 12-15%, to be kept for 6 hours, and in-furnace temperature is maintained between 550-625 DEG C, then Worm gear is cooled down, makes furnace temperature be reduced to 130-135 DEG C, be incubated 40min, then take out worm gear, you can.The present invention is to worm gear Nitrizing Treatment is carried out, the tooth face hardness of worm gear is not only increased, and teeth groove also obtains Nitrizing Treatment simultaneously, becomes after worm gear nitriding Shape is minimum, and can also eliminate the residual stress in worm gear, greatly improves the service life of worm gear.
Further, described nitrogen and ammonia are passed through volume ratio for 2:3.
Beneficial effects of the present invention：Worm-gear type jack of the present invention using treated worm and gear as drive disk assembly, The lifting capacity of existing worm-gear type jack is greatly improved, the present invention enters by carrying out Carburization Treatment to worm screw to worm gear Row Nitrizing Treatment, can greatly improve that existing worm and gear jack transmission efficiency is relatively low, more serious problem of wearing and tearing, this The bright process by worm and gear so that its relative sliding velocity is greatly reduced, is substantially reduced tooth surface abrasion, thermal diffusivity It is greatly improved, compared to the worm and gear that existing worm-gear type jack adopts specification of the same race, worm-gear type of the present invention thousand The maximum working pressure (MWP) on jin top improves more than 15%.
Specific embodiment
Embodiment 1
A kind of worm-gear type jack, by worm gear, worm screw as power-transmitting part, the worm screw through Carburization Treatment, the snail Wheel is through Nitrizing Treatment.
Equivalent friction angle of the lead angle of described worm screw less than engagement wheel between cog.
The worm screw includes through Carburization Treatment, processing method：
A. worm screw entirety Carburization Treatment:Worm screw is placed in into insulation 4 in the carburizing medium A that temperature is 900 DEG C, carbon potential is 1.4% little When, 30min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in the carburizing medium B that temperature is 900 DEG C, carbon potential is 1.0% Insulation 2 hours, be incubated 15min at being subsequently placed in 960 DEG C, then by worm screw be placed in temperature be 900 DEG C, carbon potential be 0.8% to ooze 1 hour is incubated in carbon medium C, 10min is incubated at being subsequently placed in 960 DEG C, then carry out slow cooling, temperature retention time is 60min；It is described Carburizing medium A be methanol and propane, described carburizing medium B is methanol, and the carburizing medium C is propane；
B. worm screw integrally micro carburizing and quenching process：Carbon potential is 0.62% in stove when micro carburizing and quenching is processed, and the cool time is 90min, hardening heat is 860 DEG C, and depth of hardening is 1.25mm, and at then worm screw being placed on into 120 DEG C 4 hours are incubated, then It is cooled to room temperature.
The worm gear includes through Nitrizing Treatment, processing method：
A. by worm gear at 155 DEG C isothermal holding 2 hours, be subsequently cooled to room temperature；
B. the worm gear to processing in step a carries out Nitrizing Treatment, and worm gear is placed into into the sodium carbonate liquor that mass concentration is 0.25% Middle immersion 30min, then filters, and is washed using 90 DEG C of clear water, and then drying carries out surface and uniformly beat using 500 mesh sand paper again Mill, then worm gear is placed in nitriding furnace, air in nitriding furnace is excluded totally, nitrogen and ammonia are passed through, nitriding furnace is carried out to add Heat, the resolution ratio of ammonia is controlled between 12%, to be kept for 6 hours, and in-furnace temperature is maintained between 550 DEG C, and then worm gear is entered Row cooling, makes furnace temperature be reduced to 130 DEG C, is incubated 40min, then takes out worm gear, you can.
Described nitrogen and ammonia is passed through volume ratio for 2:3.
Embodiment 2
A kind of worm-gear type jack, by worm gear, worm screw as power-transmitting part, the worm screw through Carburization Treatment, the snail Wheel is through Nitrizing Treatment.
Equivalent friction angle of the lead angle of described worm screw less than engagement wheel between cog.
The worm screw includes through Carburization Treatment, processing method：
A. worm screw entirety Carburization Treatment:Worm screw is placed in into insulation 4 in the carburizing medium A that temperature is 920 DEG C, carbon potential is 1.4% little When, 30min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in the carburizing medium B that temperature is 920 DEG C, carbon potential is 1.0% Insulation 2 hours, be incubated 15min at being subsequently placed in 960 DEG C, then by worm screw be placed in temperature be 920 DEG C, carbon potential be 0.8% to ooze 1 hour is incubated in carbon medium C, 10min is incubated at being subsequently placed in 960 DEG C, then carry out slow cooling, temperature retention time is 60min；It is described Carburizing medium A be methanol and propane, described carburizing medium B is methanol, and the carburizing medium C is propane；
B. worm screw integrally micro carburizing and quenching process：Carbon potential is 0.68% in stove when micro carburizing and quenching is processed, and the cool time is 98min, hardening heat is 870 DEG C, and depth of hardening is 1.25mm, and at then worm screw being placed on into 130 DEG C 4 hours are incubated, then It is cooled to room temperature.
The worm gear includes through Nitrizing Treatment, processing method：
A. by worm gear at 168 DEG C isothermal holding 2 hours, be subsequently cooled to room temperature；
B. the worm gear to processing in step a carries out Nitrizing Treatment, and worm gear is placed into into the sodium carbonate liquor that mass concentration is 0.25% Middle immersion 30min, then filters, and is washed using 90 DEG C of clear water, and then drying carries out surface and uniformly beat using 500 mesh sand paper again Mill, then worm gear is placed in nitriding furnace, air in nitriding furnace is excluded totally, nitrogen and ammonia are passed through, nitriding furnace is carried out to add Heat, the resolution ratio of ammonia is controlled between 15%, to be kept for 6 hours, and in-furnace temperature is maintained between 625 DEG C, and then worm gear is entered Row cooling, makes furnace temperature be reduced to 135 DEG C, is incubated 40min, then takes out worm gear, you can.
Described nitrogen and ammonia is passed through volume ratio for 2:3.
Embodiment 3
A kind of worm-gear type jack, by worm gear, worm screw as power-transmitting part, the worm screw through Carburization Treatment, the snail Wheel is through Nitrizing Treatment.
Equivalent friction angle of the lead angle of described worm screw less than engagement wheel between cog.
The worm screw includes through Carburization Treatment, processing method：
A. worm screw entirety Carburization Treatment:Worm screw is placed in into insulation 4 in the carburizing medium A that temperature is 910 DEG C, carbon potential is 1.4% little When, 30min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in the carburizing medium B that temperature is 910 DEG C, carbon potential is 1.0% Insulation 2 hours, be incubated 15min at being subsequently placed in 960 DEG C, then by worm screw be placed in temperature be 910 DEG C, carbon potential be 0.8% to ooze 1 hour is incubated in carbon medium C, 10min is incubated at being subsequently placed in 960 DEG C, then carry out slow cooling, temperature retention time is 60min；It is described Carburizing medium A be methanol and propane, described carburizing medium B is methanol, and the carburizing medium C is propane；
B. worm screw integrally micro carburizing and quenching process：Carbon potential is 0.64% in stove when micro carburizing and quenching is processed, and the cool time is 95min, hardening heat is 868 DEG C, and depth of hardening is 1.25mm, and at then worm screw being placed on into 124 DEG C 4 hours are incubated, then It is cooled to room temperature.
The worm gear includes through Nitrizing Treatment, processing method：
A. by worm gear at 162 DEG C isothermal holding 2 hours, be subsequently cooled to room temperature；
B. the worm gear to processing in step a carries out Nitrizing Treatment, and worm gear is placed into into the sodium carbonate liquor that mass concentration is 0.25% Middle immersion 30min, then filters, and is washed using 90 DEG C of clear water, and then drying carries out surface and uniformly beat using 500 mesh sand paper again Mill, then worm gear is placed in nitriding furnace, air in nitriding furnace is excluded totally, nitrogen and ammonia are passed through, nitriding furnace is carried out to add Heat, the resolution ratio of ammonia is controlled between 13%, to be kept for 6 hours, and in-furnace temperature is maintained between 578 DEG C, and then worm gear is entered Row cooling, makes furnace temperature be reduced to 133 DEG C, is incubated 40min, then takes out worm gear, you can.
Described nitrogen and ammonia is passed through volume ratio for 2:3.
Jing is tested：Compared to the worm and gear that existing worm-gear type jack adopts specification of the same race, worm-gear type of the present invention thousand The maximum working pressure (MWP) on jin top improves more than 15%, and normal working life improves more than 2 times.

Claims (5)

1. a kind of worm-gear type jack, it is characterised in that by worm gear, worm screw as power-transmitting part, the worm screw is through oozing Carbon process, the worm gear is through Nitrizing Treatment.
2. a kind of worm-gear type jack according to claim 1, it is characterised in that the lead angle of described worm screw is less than nibbling Close the equivalent friction angle of wheel between cog.
3. a kind of worm-gear type jack according to claim 2, it is characterised in that the worm screw is through Carburization Treatment, place Reason method includes：
A. worm screw entirety Carburization Treatment:Worm screw is placed in into temperature to be incubated in 900-920 DEG C, the carburizing medium A that carbon potential is 1.4% 4 hours, 30min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in into temperature for 900-920 DEG C, the carburizing that carbon potential is 1.0% 2 hours are incubated in medium B, 15min is incubated at being subsequently placed in 960 DEG C, then worm screw is placed in into temperature for 900-920 DEG C, carbon potential To be incubated 1 hour in 0.8% carburizing medium C, 10min is incubated at being subsequently placed in 960 DEG C, then carries out slow cooling, temperature retention time For 60min；Described carburizing medium A is methanol and propane, and described carburizing medium B is methanol, and the carburizing medium C is third Alkane；
B. worm screw integrally micro carburizing and quenching process：Carbon potential is 0.62-0.68% in stove when micro carburizing and quenching is processed, during quenching Between be 90-98min, hardening heat be 860-870 DEG C, depth of hardening is 1.25mm, then worm screw is placed on into 120-130 DEG C Lower insulation 4 hours, is cooled to room temperature.
4. a kind of worm-gear type jack according to claim 1, it is characterised in that the worm gear is through Nitrizing Treatment, place Reason method includes：
A. by worm gear at 155-168 DEG C isothermal holding 2 hours, be subsequently cooled to room temperature；
B. the worm gear to processing in step a carries out Nitrizing Treatment, and worm gear is placed into into the sodium carbonate liquor that mass concentration is 0.25% Middle immersion 30min, then filters, and is washed using 90 DEG C of clear water, and then drying carries out surface and uniformly beat using 500 mesh sand paper again Mill, then worm gear is placed in nitriding furnace, air in nitriding furnace is excluded totally, nitrogen and ammonia are passed through, nitriding furnace is carried out to add Heat, the resolution ratio of ammonia is controlled between 12-15%, to be kept for 6 hours, and in-furnace temperature is maintained between 550-625 DEG C, then Worm gear is cooled down, makes furnace temperature be reduced to 130-135 DEG C, be incubated 40min, then take out worm gear, you can.
5. a kind of worm-gear type jack according to claim 2, it is characterised in that described nitrogen and ammonia is passed through volume Than for 2:3.
CN201611177383.5A 2016-12-19 2016-12-19 A kind of worm-gear type jack Expired - Fee Related CN106594231B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611177383.5A CN106594231B (en) 2016-12-19 2016-12-19 A kind of worm-gear type jack

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Application Number Priority Date Filing Date Title
CN201611177383.5A CN106594231B (en) 2016-12-19 2016-12-19 A kind of worm-gear type jack

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CN106594231A true CN106594231A (en) 2017-04-26
CN106594231B CN106594231B (en) 2019-04-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110004401A (en) * 2018-01-04 2019-07-12 中车齐齐哈尔车辆有限公司 Metalwork Nitrizing Treatment method and nitriding metalwork

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102676983A (en) * 2011-03-11 2012-09-19 青岛德盛机械制造有限公司 Carburization processing method
CN102936645A (en) * 2012-10-19 2013-02-20 洛阳高登回转支承有限公司 Worm heat treatment process
CN103590050A (en) * 2013-11-29 2014-02-19 重庆清平机械厂 Carburizing and quenching method for worm part
CN105714240A (en) * 2014-12-04 2016-06-29 重庆旭新悦数控机械有限公司 Nitridation process for worm gear
CN106086769A (en) * 2016-06-20 2016-11-09 南通三荣实业有限公司 A kind of Carburization Treatment method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102676983A (en) * 2011-03-11 2012-09-19 青岛德盛机械制造有限公司 Carburization processing method
CN102936645A (en) * 2012-10-19 2013-02-20 洛阳高登回转支承有限公司 Worm heat treatment process
CN103590050A (en) * 2013-11-29 2014-02-19 重庆清平机械厂 Carburizing and quenching method for worm part
CN105714240A (en) * 2014-12-04 2016-06-29 重庆旭新悦数控机械有限公司 Nitridation process for worm gear
CN106086769A (en) * 2016-06-20 2016-11-09 南通三荣实业有限公司 A kind of Carburization Treatment method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110004401A (en) * 2018-01-04 2019-07-12 中车齐齐哈尔车辆有限公司 Metalwork Nitrizing Treatment method and nitriding metalwork

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