CN104195503B - Horizontal high-pressure air quenching backfire nitrogenizes multi-purpose vacuum stove - Google Patents
Horizontal high-pressure air quenching backfire nitrogenizes multi-purpose vacuum stove Download PDFInfo
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- CN104195503B CN104195503B CN201410223175.9A CN201410223175A CN104195503B CN 104195503 B CN104195503 B CN 104195503B CN 201410223175 A CN201410223175 A CN 201410223175A CN 104195503 B CN104195503 B CN 104195503B
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Abstract
Multi-purpose vacuum stove is nitrogenized the invention discloses a kind of horizontal high-pressure air quenching backfire, is related to metal vacuum Field of Heat-treatment；Including vacuum furnace main body, heating chamber, air cooling system, vacuum pump set, air supply system, electric control system, the heating chamber includes heating element heater, cylinder, protecgulum, bonnet, the protecgulum, after cover and be provided with air guide hole, and drive dodge gate to open and close air guide hole by cylinder, it is ensured that be tempered, during air quenching during the circulating and nitrogenize of cooling gas heating chamber closed structure；The heating and cooling rate that are brought instant invention overcomes existing nitriding furnace using nitride metal tank are slow, the low deficiency of atmosphere pressures, and possess the use condition of high pressure high flow rate quenching and tempering, simple in construction and practicality, is truly realized the use requirement of multi-purpose vacuum stove.
Description
Technical field
The present invention relates to vacuum drying oven field, and in particular to a kind of horizontal high-pressure air quenching backfire nitrogenizes vacuum drying oven.
Background technology
The external-heat gas nitriding furnace that the current country is used, has the following disadvantages：(1) thermal energy consumption is big：Nitriding will be needed
Part be placed on the nitriding tank of heat-resisting steel making, heated in shaft furnace, nitriding tank is light then one, 200 kilograms, weight then five, 600
Kilogram, or it is heavier, thermal energy consumption is very big.(2) cool slow：Due to being indirectly heat, slowly, cooling is also slow for the heating of nitriding part.For
Increase cooling rate, have propose retort is air-cooled, what is had increases air cooling system on body of heater, but still it is very slow to cool.(3) nitriding
Atmosphere pressures are low：Nitriding atmosphere pressure is low in tank, generally only tens millimeters of oils column, and atmosphere pressures are not high, greatly affected
Nitriding speed and quality.(4) air intake structure is unreasonable：One breather pipe of insertion, will to tank bottom above nitriding tank for most of stoves
Ammonia is flowed in tank from tank bottom, from gas outlet discharge.It is well known that under nitriding temperature, steel pipe promotes the decomposition of ammonia, fresh
Ammonia from the air inlet mouth of pipe flow to the outlet mouth of pipe when, part ammonia be decomposed into without activity nitrogen and hydrogen.And ooze
Nitrogen process, is the activated nitrogen atom that fresh ammonia is decomposited on ferrous metal surface, and immediately in adsorption and infiltration.Cause
This, this ventilation device is undesirable.(5) it is unfavorable for diffusion：To eliminate the brittlement phase layer of nitriding layer surface（Nitride layer, white layer）, adopt
With the diffusion technique under the conditions of high de-agglomeration rate, however, under nitriding temperature, it is difficult to accomplish there is no activated nitrogen atom to deposit in atmosphere
Therefore, it is being unfavorable for the progress of diffusion process.
The content of the invention
In order to overcome the shortcomings of existing external-heat gas nitriding furnace, the invention provides a kind of horizontal high-pressure air quenching backfire nitrogen
Change multi-purpose vacuum stove.
Technical scheme is specific as follows：
A kind of horizontal high-pressure air quenching backfire nitrogenizes the multi-purpose vacuum stove type of furnace, including vacuum furnace main body, heating chamber, air-cooled system
System, vacuum pump set, air supply system, electric control system, the heating chamber include heating element heater (1), cylinder (2), protecgulum (3),
Bonnet (4), the heating element heater (1) constitutes drum by 18 graphite rods by connecting plate, and the mode of connection is triangle, cylinder
Body (2) heat screen includes compound hard felt, graphite soft felt, ceramic fiber blanket and stainless steel panel, protecgulum (3) and bonnet (4) by every
Thermosphere is constituted, and air guide hole is provided with the middle part of protecgulum (3) and bonnet (4).Using the structure of vacuum furnace, directly heat
Part, energy- and time-economizing, heating and cooling are fast.
Wherein, cylinder (2) heat screen is combined hard felt, the thick soft felts of four layers of 10mm, the thick fibres of four layers of 10mm including one layer of 40mm thickness
Tie up felt and the thick backplates of 2mm.
Wherein, the preceding dodge gate (5) is connected by cylinder by axle (11) with small door (13), below preceding dodge gate (5)
Support member is installed（12）, positioned by support member, it is ensured that switch is flexibly accurate.Flexible by cylinder controls small door
(13) open and close, small door (13) carries out nitrogen treatment when closing, and the processing of horizontal high voltage quenching and tempering is entered during unlatching.
Wherein, the rear dodge gate (6) is connected by cylinder by axle (18) with small door (14), below rear dodge gate (6)
Support member is installed（15）, positioned by support member, it is ensured that switch is flexibly accurate.Flexible by cylinder controls small door
(14) open and close, small door (14) carries out nitrogen treatment when closing, and the processing of horizontal high voltage quenching and tempering is entered during unlatching.
Technical scheme：The air cooling system includes radiator (7), kuppe (8), impeller (9), water-cooled machine
(10), radiator support plate (16), door (17), the radiator (7) are fixed by radiator support plate (16), radiator support plate
(16) it is welded on below inboard wall of furnace body, water-cooled machine (10) and impeller (9) are by shaft hole matching, in water-cooled machine (10) axle front end
Door (17) is installed fixed, radiator (7) is bolted with kuppe (8).The present invention can about 20 minutes by part from
Nitriding temperature is as cold as less than 100 DEG C, improves the performance of infiltration layer, reduces the friable tissues of infiltration layer, it is to avoid produce temper brittleness phenomenon
Ammonia is discharged by waste gas after A air inlets, nitridation via at B during the nitridation, is realized using internal heat type vacuum equipment
High pressure（1~5bar）Gas nitriding.
Vacuum pump set of the present invention includes ZJ-600 lobe pumps, H-150 slide valve pumps and mounted in the vacuum evacuated on pipeline
Pass through joint seal of flanges between flapper valve, valve for pressure difference, flexible connecting member, each part of vacuum pump set.
The air supply system of the present invention includes nitrogen air supply system and ammonia air supply system is constituted.
The temperature programmable sequence that the electric control system of the present invention is made up of pressure regulator, controllable silicon and microprocessor is controlled
System and the mechanical action programmable control system two parts being made up of PLC and each executive component constitute nitrogen air supply system and ammonia
Air supply system is constituted, and automated procedures operation can be achieved, and have manual operation function concurrently.
The present invention has advantages below：(1) part is directly heated, energy- and time-economizing, heating and cooling are fast；(2) high insulating effect；
(3) cool down fast；(4）Cold pipe air inlet：Ammonia directly enters waste gas after air inlet at heating chamber, A, nitridation by room temperature and discharged via at B；
(5) dual system is beneficial to diffusion process：Can be 4 × 10-lUnder Pa vacuum states, heating, purification piece surface；Using inflation system,
Nitriding is carried out under 0.1~0.5MPa ammonia pressures；4 × 10-lProcessing is diffused under Pa vacuum states；(6) technology controlling and process
Simply：It all can automatically carry out, also be manually operable by the program of setting；(7) multi-use：The stove can be used for nitriding, high pressure
Air quenching, tempering, process annealing etc.；（8）Vacuum system has following effect：One is the pre- air taken out in stove, and shortening is passed through ammonia
Time, prevent part from aoxidizing；Under two are vacuum state, piece surface is purified, oxidation film layer is removed, is conducive to absorption and interface anti-
Should；Three be that can be diffused processing, reduces the fragility of high concentration superficial layer, fire-fighting nitride layer, white layer；(9) high pressure inflation/deflation structure:
Country's gas nitriding furnace pressure is about 200mm water columns at present, and this is mainly restricted by furnace binding.Vacuum high-pressure nitriding furnace uses water
Cooling furnace wall, pressing force structure of container design furnace shell, furnace gas pressure can reach O.Ol~O.6MPa, than general gas flow nitriding furnace
Furnace pressure improves 50~500 times.Body of heater be provided with reliably fill, Bleed-Air Control System;(10) pulsation airing form:By certain
In the cycle, furnace atmosphere pressure is fluctuated within the specific limits, quality layer can be improved.By the filling of control valve, deflating reaches
This purpose.Be passed through the ammonia in stove, directly inputted by ammonia tank, tank pressure is maintained at 0.8~1.2MPa, meet furnace pressure O.l~
O.5MPa requirement.Ammonia pressure of the pressure-control valve only in stove is just opened when exceeding the upper limit of pressure valve setting, once
Furnace pressure is less than controlling value, and valve is closed immediately.Therefore, no matter stove size, ammonia consumption is all little.Because discharge capacity is small,
Heat loss is also little.The gas of discharge is passed through water tank（Become ammoniacal liquor）After discharge, greatly reduce the pollution to environment.
Brief description of the drawings
Fig. 1 is the structural representation that horizontal high-pressure air quenching backfire of the present invention nitrogenizes multi-purpose vacuum stove.
In figure：1st, heating element heater；2nd, cylinder；3rd, protecgulum；4th, bonnet；5th, preceding dodge gate；6th, rear dodge gate；7th, radiator；
8th, kuppe；9th, impeller；10th, water-cooled machine；11st, axle；12nd, support member；13rd, small door；14th, small door；15th, support member；16、
Radiator support plate；17th, door；18th, axle.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
The present invention includes vacuum furnace main body, heating chamber, air cooling system, vacuum pump set, air supply system, electric control system,
Wait not enough slowly for the heating, cooling speed that traditional nitriding furnace is brought using nitridation jar structure, nitridation workpiece is directly placed
In heating chamber.
The heating chamber includes heating element heater (1), cylinder (2), protecgulum (3), bonnet (4), and the heating element heater (1) is by 18
Root graphite rod constitutes drum by connecting plate, and the mode of connection is triangle, and cylinder (2) heat screen includes compound hard felt, stone
The soft felt of ink, ceramic fiber blanket and stainless steel panel, protecgulum (3) and bonnet (4) are made up of thermal insulation layer, in protecgulum (3) and bonnet (4)
Middle part be provided with air guide hole.
Wherein, cylinder (2) heat screen is combined hard felt, the thick soft felts of four layers of 10mm, the thick fibres of four layers of 10mm including one layer of 40mm thickness
Tie up felt and the thick backplates of 2mm.
Wherein, the preceding dodge gate (5) is connected by cylinder by axle (11) with small door (13), below preceding dodge gate (5)
Support member is installed（12）.
Wherein, the rear dodge gate (6) is connected by cylinder by axle (18) with small door (14), below rear dodge gate (6)
Support member is installed（15）
Air guide hole before and after being closed during nitrogen treatment is carried out, makes heating chamber formation confined space, by wherein 18 Homogeneous Circulars
The heating element heater (1 of arrangement）Directly heat, it is ensured that programming rate is fast and temperature uniformity is good.Charging basket, work are removed in other heating chamber
Other metal structures are not present outside part, ammonia directly enters air inlet at heating chamber, A by room temperature, all effectively reduce ammonia with work
Decomposition before nitriding reaction occurs for part.Ensure the activated nitrogen atom that fresh ammonia is decomposited on workpiece metal surface, and immediately
In adsorption and infiltration.
Air cooling system of the present invention includes radiator (7), kuppe (8), impeller (9), water-cooled machine (10), radiator
Support plate (16), door (17), the radiator (7) are fixed by radiator support plate (16), and radiator support plate (16) is welded on
Below inboard wall of furnace body, by shaft hole matching, door is installed in water-cooled machine (10) axle front end with impeller (9) for water-cooled machine (10)
(17) fixed, radiator (7) is bolted with kuppe (8).Air cooling system can about 20 minutes by part from nitriding temperature
Degree is as cold as less than 100 DEG C, improves the performance of infiltration layer, reduces the friable tissues of infiltration layer, it is to avoid produce temper brittleness phenomenon.Also can be right
Workpiece carries out high pressure gas quenching, tempering, annealing, and wherein air quenching pressure can reach 6bar, be truly realized the knot of multi-use
Structure requirement.
Above by reference to embodiment, the present invention is described.But it will be understood by those skilled in the art that can also be upper
State and a variety of conversion or replacement are carried out to it on the basis of embodiment.Therefore, the protection model of the invention being defined by the claims
Enclose, it not only includes the mode described in above-described embodiment, also cover various modifications, conversion and equivalent way.
Claims (2)
1. a kind of horizontal high-pressure air quenching backfire nitrogenizes multi-purpose vacuum stove, including vacuum furnace main body, heating chamber, air cooling system, vacuum
Unit, air supply system, electric control system, it is characterised in that：The heating chamber includes heating element heater (1), cylinder (2), protecgulum
(3), bonnet (4), the heating element heater (1) constitutes drum by 18 graphite rods by connecting plate, and the mode of connection is triangle
Shape, cylinder (2) heat screen includes compound hard felt, graphite soft felt, ceramic fiber blanket and stainless steel panel, protecgulum (3) and bonnet (4)
It is made up of thermal insulation layer, air guide hole is provided with the middle part of protecgulum (3) and bonnet (4)；Preceding dodge gate (5) passes through axle by cylinder
(11) it is connected with small door (13), support member (12) is installed below preceding dodge gate (5)；Dodge gate (6) passes through axle by cylinder afterwards
(18) it is connected with small door (14), support member (15) is installed below rear dodge gate (6)；
The air cooling system include radiator (7), kuppe (8), impeller (9), water-cooled machine (10), radiator support plate (16),
Door (17), the radiator (7) is fixed by radiator support plate (16), and radiator support plate (16) is welded under inboard wall of furnace body
Side, water-cooled machine (10) by shaft hole matching, is installed door (17) in water-cooled machine (10) axle front end and fixed, dissipate with impeller (9)
Hot device (7) is bolted with kuppe (8).
2. a kind of horizontal high-pressure air quenching backfire nitridation multi-purpose vacuum stove according to claim 1, it is characterised in that：Cylinder
(2) heat screen includes one layer of compound hard felt of 40mm thickness, the thick soft felts of four layers of 10mm, four layers of 10mm thick fibers felt and the thick backplates of 2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410223175.9A CN104195503B (en) | 2014-05-25 | 2014-05-25 | Horizontal high-pressure air quenching backfire nitrogenizes multi-purpose vacuum stove |
Applications Claiming Priority (1)
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| CN201410223175.9A CN104195503B (en) | 2014-05-25 | 2014-05-25 | Horizontal high-pressure air quenching backfire nitrogenizes multi-purpose vacuum stove |
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| CN104195503A CN104195503A (en) | 2014-12-10 |
| CN104195503B true CN104195503B (en) | 2017-10-20 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104651568B (en) * | 2015-02-12 | 2016-09-07 | 浙江省长兴精工电炉制造有限公司 | The program control tempering furnace of atmosphere protection in high precision |
| CN105033399A (en) * | 2015-06-26 | 2015-11-11 | 郑英 | Protective gas heat treatment tank sealing structure capable of resisting cold and hot deformation through vacuumization |
| CN105618884A (en) * | 2016-02-26 | 2016-06-01 | 沈阳广泰真空科技有限公司 | Horizontal type vacuum furnace for diamond particle brazing |
| CN107641783A (en) * | 2017-08-31 | 2018-01-30 | 安徽信息工程学院 | Magnetic material nitridation device |
| CN110157882A (en) * | 2019-06-11 | 2019-08-23 | 上海富驰高科技股份有限公司 | A kind of stainless steel aging of middle temperature heat treatment method and its vacuum drying oven |
| CN110952061A (en) * | 2019-12-16 | 2020-04-03 | 上海始金新材料科技有限公司 | Horizontal oxynitriding furnace |
| CN110951952A (en) * | 2019-12-18 | 2020-04-03 | 上海始金新材料科技有限公司 | Vacuum water quenching equipment |
| CN111397361A (en) * | 2020-03-31 | 2020-07-10 | 北京机电研究所有限公司 | Furnace structure of vacuum hydrogen furnace with air cooling function |
| CN112853072A (en) * | 2020-12-31 | 2021-05-28 | 江苏华苏工业炉制造有限公司 | Horizontal multizone heating high vacuum tempering furnace of square single chamber |
| CN114540746B (en) * | 2021-11-01 | 2023-06-27 | 杭州永磁集团有限公司 | Special vacuum rotary nitriding furnace for rare earth nitride |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6533991B1 (en) * | 2000-06-20 | 2003-03-18 | Ipsen International, Inc. | Cooling gas injection nozzle for a vacuum heat treating furnace |
| KR100591355B1 (en) * | 2002-03-25 | 2006-06-19 | 히로히사 타니구치 | Hot gas quenching devices and hot gas heat treating method |
| CN101319271A (en) * | 2008-07-18 | 2008-12-10 | 沈阳恒进真空科技有限公司 | Nozzle cooling vacuum gas quenching furnace capable of convection heating |
| CN201772726U (en) * | 2010-05-06 | 2011-03-23 | 湖南省宏元稀有金属材料有限公司 | Dedicated high-temperature and high-vacuum sintering furnace for VN alloy production |
| CN204080088U (en) * | 2014-05-25 | 2015-01-07 | 北京华翔电炉技术有限责任公司 | Horizontal high-pressure air quenching backfire nitrogenize multi-purpose vacuum stove |
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