CN2737805Y - Ion-nitriding furnace - Google Patents
Ion-nitriding furnace Download PDFInfo
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- CN2737805Y CN2737805Y CN 200420067381 CN200420067381U CN2737805Y CN 2737805 Y CN2737805 Y CN 2737805Y CN 200420067381 CN200420067381 CN 200420067381 CN 200420067381 U CN200420067381 U CN 200420067381U CN 2737805 Y CN2737805 Y CN 2737805Y
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Abstract
The utility model discloses an ion-nitriding furnace belonging to the metal thermal processing device. The nitriding furnace is composed of an arc furnace cover, a circular furnace cylinder, an arc furnace base, a quick freezing system, a cathode power transmission device and a temperature measuring equipment. The utility model is characterized in that the arc furnace cover is equipped with the quick freezing system simultaneously performing the function of homogenizing the furnace temperature, while the cathode power transmission device is accumbent below the cathode plate to bear no weight. The circular furnace cylinder makes use of the heat insulation layer composed of a water cooling layer and a vacuum layer (an air layer) to conduct heat insulation cooperating with the heat screen. The furnace base presents an arc, and the cathode power transmission device and the temperature measuring equipment are positioned on the side surface of the furnace base. The joint of the cooling water and the vacuum layer (the air layer) adopting the quick joint has the advantages of high cooling rate, excellent homogeneity of working piece temperature, energy saving, and convenient maintenance. Moreover any cooling water tube and air pipe are not needed, when the cooling water and the vacuum layer (the air layer) are suspensibly clasped with each other. The ion-nitriding furnace is especially applicable to the nitriding treatment of steel parts and the metallic surface strengthening treatment.
Description
Technical field
The utility model relates to the specific equipment of ionitriding, belongs to the Equipment for Heating Processing field.
Background technology
Ionitriding be a kind ofly can significantly improve that the steel-iron components surface abrasion resistance decreases, tired, burn into resistance to high temperature oxidation and improve the metal surface enhanced technology in workpiece life-span.It is that pending workpiece is placed in the vacuum vessel, and fill nitrogenous gas with 133～1333pa low pressure, with workpiece as negative electrode, the wall cover of vacuum vessel is established metal anode in addition as anode or in container, between anode and cathode, add hundreds of volt volts DSs, two interpolar rarefied gases are ionized, thereby produce the technological process of glow discharge.After aura is lighted, because the gas in the container is ionized, positive ion is to the workpiece motion s as negative electrode, electronics will fly to anode, just there is the successive electric current to pass through like this between anode and cathode, the ion of nitrogen and hydrogen is under the effect of high-voltage electric field, with very big energy bombardment workpiece surface, produce a large amount of heats workpiece is heated to needed temperature, the positive ion of nitrogen produces compound at workpiece surface simultaneously, the physical-chemical reaction of chemical reaction and absorption, diffusion has formed the nitride layer of high rigidity and the chemical layer of multielement faster.Be used to finish the specific equipment of this workpiece surface reinforcing process, be referred to as ion-nitriding furnace.
Existing ion-nitriding furnace has bell furnace, pit furnace and general form stove, and according to the requirement of ionitriding technology, its whole plant comprises vacuum furnace body, vacuum system, airing system and power supply system.
In order to guarantee the quality of ionitriding, require the ionitriding vacuum oven to have usually: 1. good air-tightness will reach 133～1333pa vacuum requirements to adapt in the stove.2. good insulation performance is when having 500～1000 volts volts DS, when guaranteeing that cathode leg passes body of heater and the body of heater insulation between anode and cathode.3. because the sealed insulating material heat resisting temperature of body of heater is lower, generally have only 60～90 ℃, and furnace temperature is 500～600 ℃ during nitriding, so vacuum furnace body to there be good thermal insulation.
In existing technology, most typical is the general form ion-nitriding furnace.This stove mainly is made of bottom and the cathode electricity transmission device between the cathode disc, vacuum system, airing system and the power supply system of bell, round kiln tube, flattening oven base, general body of heater.This general form ion-nitriding furnace is applicable to the workpiece of handling elongated and tubbiness, highly versatile, but also exist the some shortcomings part: 1. vacuum furnace body all adopts water-cooled, and energy loss is very big.2. speed is slow during work-piece cools, is unfavorable for handling the quality and the working efficiency of back workpiece.When 3. handling farm labourer's part, upper and lower temperature difference is big, poor temperature uniformity.4. the cathode electricity transmission device unreasonable structure poor sealing, shielding gap destruction often occur and beats the arc phenomenon.5. furnace base is a slab construction, and supporting capacity is low, and waste material is unfavorable for the gas flow circulation, the dead angle often occurs.6. airing system, vacuum system, water-cooling system and power supply system all are placed in the bottom of furnace bottom, make maintenance very inconvenient.7. water coolant links to each other by each one of rubber hose and body of heater, to withholding very inconvenience of body of heater.8. become whole anode when making the work of bell, stove tube and furnace base, need they are linked up mutually with lead.
Summary of the invention
In order to solve the deficiency on the prior art, fast, the workpiece temperature good uniformity of speed when a kind of energy-conservation, work-piece cools is provided, cathode electricity transmission device are rational in infrastructure, good airproof performance, shielding gap are not damaged, do not produce and beat arc phenomenon, supporting capacity height, save material, the furnace gas circulation is smooth and easy, maintenance is convenient, be not with when withholding body of heater any water coolant take over and during work whole furnace shell do not become the anodic ion-nitriding furnace automatically, special technical solution of the present utility model proposed:
A kind of ion-nitriding furnace, comprise bell, body of heater, furnace base and temperature measuring equipment, it is characterized in that described bell is the pair of lamina arcuate structure, vacuum motor and fan are equipped with in its top, heat exchanger and air inlet endless tube are arranged under the fan, and heat exchanger is connected with heating pipe joint with the water-cooled tube joint respectively with the air inlet endless tube; Described furnace base also is a kind of double-deck arcuate structure, and the outside is equipped with 120 ° of uniform cathode disc systems and cathode transmission system respectively in its bottom; Described body of heater is made of double-layered cylinder, and fixedly connected with ring flange in two ends up and down, and the cavity that cylinder and ring flange surround has formed thermofin; On bell ring flange side, the water-cooled tube joint is arranged, on the upper flange end face of stove tube and furnace base, the V-type groove is arranged, the O RunddichtringO is arranged in the groove; In described upper flange, also have the anode Automatic Link Establishment, can realize that by this device bell, body of heater are electrically connected with the anode of furnace base.
Described cathode disc system is made up of cathode disc and cathode support device, and described negative electrode is to be supported and by the power supply of aforesaid cathode transmission system by three 120 ° uniform adjusting bolts.
Described cathode support device is formed by regulating bolt, nut, external shroud, locating sleeve, inner shield cover, supporting seat and base, and forms the gap protection layer of specified dimension and the gas shield layer of the anti-sputter of formation between inner shield cover and supporting seat between external shroud and inner shield cover.
Described cathode transmission system comprises the negative electrode guide pin bushing that is packed on the arc-shaped base and the conductive component be made up of conductive plug, conducting rod, conducting plates and nut and be sleeved on insulation covering, metal external insulation sleeve in insulation covering on this conductive component, insulation gland, the insulation covering that plays anti-sputter effect, splash-proof casing, insulation locating sleeve, the metal, and, realize being flexible coupling by conducting plates and cathode transmission system with conductive component and firm pressing plate, hold-down nut and the firm screw together of splashproof insulating part.
Described body of heater anode Automatic Link Establishment is meant that the upper flange at two-deck oven tube and arc furnace base is provided with through hole, interior dress anode posts and spring, lower end band fitting nut, anode posts by nut be connected lead and connect, the other end that connects lead links to each other with two-deck oven tube and arc furnace base by bolts and nuts.
The thermofin that described cylinder and ring flange surround comprise water-cooled layer and vacuum layer gas cloud, also have a thermoscreen that surrounds by steel plate in the inside of vacuum layer; On described vacuum layer, there is tube stub to communicate, can realizes finding time and inflating aforementioned vacuum layer by transmodulator with transmodulator.
The thermometric assembly that described temperature measuring equipment is made up of thermopair, thermopair insulation covering and sealing-ring is contained in it in the thermocouple sheath on arc-shaped base by hold-down nut and screw and partiting thermal insulation cover and bell housing.
The utility model compared with the prior art, its technical feature difference sees the following form.Major advantage is: 1. Proper Design becomes vacuum heat-insulating layer 8, and good heat insulating can be saved the energy 12%.2. the vacuum motor pilot-gas flows, and makes the workpiece temperature good uniformity of processing, and upper and lower temperature difference is very little.3. cathode electricity transmission device 44 is rational in infrastructure, and good airproof performance is hardwares though constitute the member of air gap protective layer both sides, does not produce " beating arc " phenomenon.4. furnace base 11 is designed to arc, so the voltage endurance capability height can be saved material 50% under similarity condition.5. furnace gas circulates, and does not have the dead angle.6. be deposited on the bottommost of arc furnace base 11 owing to foul, and the endless tube 12 of bleeding is higher than the bottom, so can not enter in the vacuum pump.7. the cathode electricity transmission device 44 of body of heater, thermocouple temperature measuring apparatus and required bleed line outlet design be in the side of arc furnace base 11, so maintaining and maintenance are very convenient.8. because arc bell 4 is provided with accelerate cooling system, so speed of cooling is accelerated.9. round kiln tube 15 and lower flange place thereof are provided with a plurality of water coolant rapid-acting couplings, do not have any water pipe when withholding, convenient work.
The utility model technology and prior art performance are relatively
| Furnace binding | The furnace wall go into water temp (℃) | The furnace wall leaving water temperature(LWT) (℃) | Heating-up time (H) | Temperature uniformity |
| No thermofin | 17 | 55 | 4.5 | Bad |
| Vacuum layer (gas cloud) | 17 | 38 | 2.2 | Good |
| Remarks | Workpiece surface is long-pending identical when handling, under processing condition the same terms, adopt when heat insulation, and thermo-efficiency can improve 30%. | |||
Description of drawings
Fig. 1 is that the designed ion-nitriding furnace of the utility model is faced diagrammatic cross-section.
Fig. 2 is a utility model ion-nitriding furnace whole plant synoptic diagram.
Fig. 3 is the diagrammatic cross-section of the designed round kiln tube side structure of the utility model.
Fig. 4 is the diagrammatic cross-section of facing of arc bell.
Fig. 5 is the schematic top plan view of arc bell.
Fig. 6 is that the utility model arc furnace base structure is faced diagrammatic cross-section.
Fig. 7 is the utility model arc furnace base structure top cross-sectional view.
Fig. 8 is that Fig. 7 A-A is to view.
Fig. 9 is that Fig. 7 B-B is to view.
Figure 10 is the cross-sectional view of facing of the utility model cathode support device.
Figure 11 is the designed cathode electricity transmission device cross-sectional view of the utility model.
Figure 12 is the diagrammatic cross-section of the utility model anode Automatic Link Establishment.
Among the figure: 0, body of heater 1, centrifugal fan 2, safety valve 3, vacuum motor 4, bell 5, electro connecting pressure gauge 6, heat exchanger 7, flow deflector 8, vacuum layer 9, water-cooled layer 10, guiding ring flat-plate 11, arc furnace base 12, the endless tube 13 of bleeding, cathode support device 14, cathode disc 15, round kiln tube 16, thermoscreen 17, thermal baffle 18, air inlet endless tube 19, heat exchanger cooling water entrance tube stub 20, bell entrance of cooling water tube stub 21, bell cooling water outlet tube stub 22, hang ring 23, heating pipe joint 25, dovetail-indent 26, cathode block 29, O RunddichtringO 31, set screw 32, vacuum gas discharge valve 33, vacuum gauge 34, gusset plate 35, thermopair insulation covering III 36, thermopair insulation covering II37, thermopair insulation covering I 38, thermopair 39, hold-down nut 40, sealing-ring 41, thermopair guide pin bushing 42, partiting thermal insulation cover 43, bell housing 44, cathode electricity transmission device 45, conducting plates 46, nut 47, bolt 48, regulate bolt 49, nut 50, external shroud 51, locating sleeve 52, inner shield cover 53, supporting seat 54, chassis 55, conductive plug 56, plug insulation covering 57, pressing plate 58, friction top 59, sealing-ring 60, splash-proof casing 61, insulation locating sleeve 62, insulation covering 63 in the metal, metal external insulation sleeve 64, packing ring 65, nut 67, conducting rod 68, insulation covering 69, negative electrode guide pin bushing 70, bolt 71, insulation gland 72, power supply system 73, vacuum system 74, airing system 75, accelerate cooling system 76, anode posts 77, spring 78, nut
Embodiment
As shown in the figure.Wherein Fig. 1 is the cross-sectional view of facing of the designed ion-nitriding furnace of the utility model.It is by arc bell 4, accelerate cooling system, round kiln tube 15, arc furnace base 11 and is horizontally placed on arc furnace base 11 lateral cathode electricity transmission devices 44 and thermocouple temperature measuring apparatus is constituted.Accelerate cooling system is made up of vacuum motor 3, centrifugal fan 1, pressure safety valve 2, electro connecting pressure gauge 5, heat exchanger 6, flow deflector 7, thermal baffle 17, thermoscreen 16 and guiding ring flat-plate 10 etc.Cooling gas enters in the stove by heating pipe joint 23, air inlet endless tube 18 through vacuum valve, the centrifugal fan 1 that drives at vacuum motor 3 blows down, walk heat by thermal baffle 17 and the workpiece contact zones of handling, guiding through guiding ring flat-plate 10, between thermoscreen 16 and round kiln tube 15 inner layer steel plates, flow, again by flow deflector 7, under the blowing of centrifugal fan 1, through the cooling (taking away heat) of over-heat-exchanger 6, cool off workpiece circularly.When need make workpiece temperature even, open vacuum motor 3 and drive centrifugal fans 1, blow nitriding gas at the workpiece of handling constantly circulation up and down (consistent) with the cooling gas direction that flows, with the acting in conjunction of vacuum layer 8 under, reach good temperature homogeneity.
Fig. 2 is a utility model ion-nitriding furnace whole plant synoptic diagram.This ion-nitriding furnace whole plant be by ionitriding body of heater 0, and known vacuum acquiring system 73, airing system 74, cooling but water system 75 and power supply system 72 are constituted.
Fig. 3 is the cross-sectional view of the designed round kiln tube 15 side structure forms of the utility model.Its outside is a water-cooled layer 9, inwardly is vacuum layer (gas cloud) 8, and the inside is a thermofin 16.On the flange of the upper surface of round kiln tube 15, be provided with dovetail-indent 25,, and be provided with the T type through hole of laying the anode Automatic Link Establishment in order to installation " O " RunddichtringO 29, so that arc bell 4, round kiln tube 15, arc furnace base 11 threes are connected, become the anode of ion-nitriding furnace 0.
Fig. 4 is the elevation cross-sectional view of arc bell 4.It by vacuum motor 3, centrifugal fan 1, pressure safety valve 2, electro connecting pressure gauge 5, heat exchanger 6, flow deflector 7, heating pipe joint 23, air inlet endless tube 18, heat exchanger cooling water turnover joint 19, bell water coolant into and out of joint 20,21 with hang ring 22 etc. and form.In the technical program, bell cooling water layer structure shields to furnace sealing circle and vacuum motor sealing-ring, and flow deflector 7 plays regulation gas flow direction and the 4 thermoscreen effects of arc bell simultaneously.
Fig. 5 is the schematic top plan view of arc bell 4.Be in body of heater 0 axial location above it and be provided with vacuum motor 3, this axis also is provided with the security device-electro connecting pressure gauge 5 and the pressure safety valve 2 of system symmetrically.There are heat exchanger cooling water pipe head 19, bell water coolant import and export tube stub 20,21 and heating pipe joint 23 in arc bell top.The top of arc bell 4 be provided be mutually 120 degree hang ring 22.
Fig. 6 is the utility model arc furnace base 11 structure elevation cross-sectional view.Arc furnace base 11 the insides are provided with three cathode blocks 26.Cathode disc 14 is supported by the cathode support device 13 of the face of being placed on it, and is provided with dovetail-indent 25 on flange.Lay " O " RunddichtringO 29 in it, at the arc furnace base 11 bottommosts designs endless tube 12 of bleeding.The central design of arc furnace base 11 has vapor pipe, and the endless tube 12 of bleeding is housed in stove on it, and has retaining screw 31, stove that vacuum gas discharge valve 32 and vacuum gauge 33 are housed outward, and the web plate 34 that is connected with round kiln tube 15 is arranged on arc furnace base 11 flanges.
Fig. 7 is the utility model arc furnace base 4 structure schematic top plan view." O " RunddichtringO 29 is arranged in annular dovetail slot, and at a distance of 15 degree, design has the thermocouple temperature measuring equipment of A-A and the cathode electricity transmission device 44 of B-B respectively in the side of furnace base.Cathode electricity transmission device 44 puts in the burner hearth from the side of arc-shaped base 11, and is in the below of cathode disc 14.
Fig. 8 be Fig. 7 A-A to view, the temperature measuring equipment cross-sectional view that the utility model is designed.By side with water-cooled layer refrigerative arc furnace base 11; be connected with thermopair guide pin bushing 41; 41 li of guide pin bushings along its axis; thermopair 38 is installed in thermopair insulation covering (I) 37; thermopair insulation covering (II) 36; in the thermopair insulation covering (III) 35; insulation covering 40 is installed on it; they are put into 41 li of thermopair guide pin bushings; tighten hold-down nut 39 sealings; again partiting thermal insulation cover 42 is passed thermopair 38; be tightened in an end in thermopair guide pin bushing 41 stoves; at last bell housing 43 is passed thermopair 38 and overlap on 42 at partiting thermal insulation, form the gap protection layer by screw retention.The thermocouple lead plug need only be inserted in the stove outside, promptly finish thermometric.
Fig. 9 be Fig. 7 B-B to view, designed cathode electricity transmission device of the utility model 44 and cathode disc syndeton synoptic diagram.Cathode disc is fixed on both sides by bolt 47, nut 46, is connected with cathode electricity transmission device 44 by conducting plates 45 again.
Figure 10 is the cross-sectional view of facing of the utility model cathode support 13.It is formed by regulating bolt 48, nut 49, external shroud 50, locating sleeve 51, inner shield cover 52, supporting seat 53 and chassis 54.Regulate the height of bolt 48, nut 49 adjustable cathode dishes 14, between external shroud 50 and the inner shield cover 52, form the gap protection layer of specified dimension; Between inner shield cover 52 and the supporting seat 53 the air gap protective layer is arranged, play the splashproof effect.
Figure 11 is the designed cathode electricity transmission device of the utility model 44 diagrammatic cross-sections.In the side of passing through with water-cooled layer refrigerative arc furnace base 11; be connected with negative electrode guide pin bushing 69; along its axis insulation covering 68 by sealing-ring and its sealing is installed 69 li of negative electrode guide pin bushings; by the conducting rod 67 of sealing-ring 59 with insulation covering 68 sealings; splash-proof casing 60; insulation locating sleeve 61 and metal external insulation sleeve 63; compress by packing ring 64 with nut 65; in metal between insulation covering 62 and the metal external insulation sleeve 63; just formed a predetermined gap protective layer; just conducting plates 66 is fastened on the conducting rod 67 again; conducting plates 66 is connected with cathode disc; stretch out an end in the arc furnace base outside again by negative electrode guide pin bushing 69; insulation gland 71 is installed in it; pressing plate 57; fastening with bolt 70; conductive plug 55 is installed in termination at conducting rod 67; plug insulation covering 56; use friction top 58 fastening at last, electric current just passes through supply lead like this; conductive plug 55; conducting rod 67 and conducting plates 66 have arrived on the cathode disc 14.
Figure 12 is the diagrammatic cross-section of the utility model anode Automatic Link Establishment.Be provided with through hole at the flange of arc furnace base 11 and the upper flange of round kiln tube 15, in anode posts 76 and spring 77, lower end fitting nut 78 are housed.Anode posts is connected with the connection lead by nut 78, and the other end that is communicated with lead links to each other with arc furnace base 11 with round kiln tube 15 by screw bolt and nut.
Claims (7)
1, a kind of ion-nitriding furnace, comprise bell, body of heater, furnace base and temperature measuring equipment, it is characterized in that described bell is the pair of lamina arcuate structure, vacuum motor (3) and fan (1) are equipped with in its top, heat exchanger (6) and air inlet endless tube (18) are arranged under the fan, and heat exchanger is connected with heating pipe joint (23) with water-cooled tube joint (19) respectively with the air inlet endless tube; Described furnace base also is a kind of double-deck arcuate structure, and the outside is equipped with 120 ° of uniform cathode disc systems and cathode transmission system respectively in its bottom; Described body of heater is made of double-layered cylinder, and fixedly connected with ring flange in two ends up and down, and the cavity that cylinder and ring flange surround has formed thermofin; Water-cooled tube joint (20) is arranged on bell ring flange side, V-type groove (25) is arranged on the upper flange end face of stove tube and furnace base, O RunddichtringO (29) is arranged in the groove; In described upper flange, also have the anode Automatic Link Establishment, can realize that by this device bell, body of heater are electrically connected with the anode of furnace base.
2, ion-nitriding furnace according to claim 1, it is characterized in that described cathode disc system is made up of cathode disc (26) and cathode support device (13), described negative electrode is to be supported and by the power supply of aforementioned cathode transmission system by three 120 ° uniform adjusting bolts.
3, ion-nitriding furnace according to claim 2; it is characterized in that described cathode support device is formed by regulating bolt (48), nut (49), external shroud (50), locating sleeve (51), inner shield cover (52), supporting seat (53) and base (54), and forming the gap protection layer of specified dimension between external shroud (50) and the inner shield cover (52) and between inner shield cover (52) and supporting seat (53), forming the gas shield layer of preventing sputter.
4, ion-nitriding furnace according to claim 1 and 2, it is characterized in that described cathode transmission system comprises the negative electrode guide pin bushing (69) that is packed on the arc-shaped base (11) and by conductive plug (55), conducting rod (67), the conductive component that conducting plates (45) and nut (65) are formed and be sleeved on insulation covering (56) on this conductive component, insulation gland (71), play the insulation covering (68) of anti-sputter effect, splash-proof casing (60), insulation locating sleeve (61), insulation covering (62) in the metal, metal external insulation sleeve (63), and with conductive component and the firm pressing plate (57) together of splashproof insulating part, hold-down nut (58) and firm screw (71) are realized being flexible coupling with the cathode transmission system by conducting plates (45).
5, ion-nitriding furnace according to claim 1 and 2, it is characterized in that described body of heater anode Automatic Link Establishment is meant that the upper flange at two-deck oven tube and arc furnace base is provided with through hole, interior dress anode posts (76) and spring (77), lower end band fitting nut (78), anode posts by nut be connected lead and connect, the other end that connects lead links to each other with two-deck oven tube (15) and arc furnace base (11) by bolts and nuts.
6, ion-nitriding furnace according to claim 1, it is characterized in that thermofin that described cylinder and ring flange surround comprise water-cooled layer (9) and vacuum layer gas cloud (8), also have a thermoscreen that surrounds by steel plate (16) in the inside of vacuum layer; On described vacuum layer, there is tube stub (23) to communicate, can realizes finding time and inflating aforementioned vacuum layer by transmodulator with transmodulator.
7, ion-nitriding furnace according to claim 1, it is characterized in that the thermometric assembly that described temperature measuring equipment is made up of thermopair (38), thermopair insulation covering (35), (36), (37) and sealing-ring (40), it is contained in the thermocouple sheath (41) on the arc-shaped base (11) by hold-down nut (39) and screw and partiting thermal insulation cover (42) and bell housing (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420067381 CN2737805Y (en) | 2004-06-07 | 2004-06-07 | Ion-nitriding furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420067381 CN2737805Y (en) | 2004-06-07 | 2004-06-07 | Ion-nitriding furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2737805Y true CN2737805Y (en) | 2005-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420067381 Expired - Fee Related CN2737805Y (en) | 2004-06-07 | 2004-06-07 | Ion-nitriding furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN2737805Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104674216A (en) * | 2015-02-13 | 2015-06-03 | 深圳市华宇发真空离子技术有限公司 | Multifunctional infiltration furnace and diffusion coating and coating integrated method |
| CN105220108A (en) * | 2015-10-23 | 2016-01-06 | 西华大学 | Interactive double cathode ion surface heat treatment furnace |
| CN108677133A (en) * | 2018-07-04 | 2018-10-19 | 盐城丰东特种炉业有限公司 | A kind of the nitriding furnace rear chamber and its sealing cooling means of vacuum-pumping |
| CN111962014A (en) * | 2020-09-04 | 2020-11-20 | 湖南申亿五金标准件有限公司 | Stainless steel strengthening heat treatment process and heat treatment nitriding furnace |
-
2004
- 2004-06-07 CN CN 200420067381 patent/CN2737805Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104674216A (en) * | 2015-02-13 | 2015-06-03 | 深圳市华宇发真空离子技术有限公司 | Multifunctional infiltration furnace and diffusion coating and coating integrated method |
| CN105220108A (en) * | 2015-10-23 | 2016-01-06 | 西华大学 | Interactive double cathode ion surface heat treatment furnace |
| CN108677133A (en) * | 2018-07-04 | 2018-10-19 | 盐城丰东特种炉业有限公司 | A kind of the nitriding furnace rear chamber and its sealing cooling means of vacuum-pumping |
| CN111962014A (en) * | 2020-09-04 | 2020-11-20 | 湖南申亿五金标准件有限公司 | Stainless steel strengthening heat treatment process and heat treatment nitriding furnace |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |