CN115287585A - Horizontal controllable atmosphere nitriding furnace - Google Patents
Horizontal controllable atmosphere nitriding furnace Download PDFInfo
- Publication number
- CN115287585A CN115287585A CN202210938173.2A CN202210938173A CN115287585A CN 115287585 A CN115287585 A CN 115287585A CN 202210938173 A CN202210938173 A CN 202210938173A CN 115287585 A CN115287585 A CN 115287585A
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- Prior art keywords
- horizontal
- furnace body
- frame
- piece
- horizontal furnace
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- 238000005121 nitriding Methods 0.000 title claims abstract description 60
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 45
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000004320 controlled atmosphere Methods 0.000 claims description 17
- 239000010425 asbestos Substances 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 11
- 229910052895 riebeckite Inorganic materials 0.000 claims description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 238000000034 method Methods 0.000 description 10
- 239000000498 cooling water Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention relates to the technical field of atmosphere nitriding furnaces, in particular to a horizontal type controllable atmosphere nitriding furnace; including horizontal furnace body, heating element, the circulative cooling pipe fitting and the material that encircle the inside wall setting of horizontal furnace body carry the piece, the material is carried the piece and is included the transport rail, two rows of work piece racks and transportation frame, every work piece rack all includes stand and a plurality of flexible clamping jaw, and flexible clamping jaw inboard is equipped with supports tight spring and cooperation piece, and one side of transportation frame still is equipped with the baffle, with closed horizontal furnace body, stand and the upside fixed connection of transportation frame, a plurality of flexible clamping jaws distribute in the both sides of stand, the one end setting of supporting tight spring is in the inboard of flexible clamping jaw, the cooperation piece sets up the other end at supporting tight spring, improve the structure of nitriding furnace, change into horizontal furnace body, and correspond to addding the material and carry the piece, utilize flexible clamping jaw cooperation stand, promote the convenience of placing of cast work piece.
Description
Technical Field
The invention relates to the technical field of atmosphere nitriding furnaces, in particular to a horizontal type controllable atmosphere nitriding furnace.
Background
In order to improve the surface performance, the workpiece is mostly required to be placed in a nitriding atmosphere, and after heating, nitriding treatment is realized, the workpiece subjected to nitriding treatment has better surface hardness and wear resistance, but the conventional nitriding furnace usually adopts a natural cooling mode, so that the cooling rate is slower;
in the existing nitriding furnace, after a workpiece is placed on a rack, a furnace body falls down from the top and is wrapped on the periphery of the rack for nitriding, in the prior art, in order to increase the cooling rate of the atmosphere nitriding furnace, a circulating cooling pipe fitting is additionally arranged in the furnace body, and after the nitriding process is finished, cold water is circulated in the circulating cooling pipe fitting to realize cooling of the nitriding furnace so as to meet the subsequent use requirements;
when the nitriding furnace is used, the nitriding furnace needs to be vertically arranged when processing a tubular workpiece, and the workpiece is easy to touch in the process of moving the furnace body downwards, so that improvement is urgently needed to improve the nitriding efficiency of the tubular workpiece.
Disclosure of Invention
The invention aims to provide a horizontal type controlled atmosphere nitriding furnace to solve the problem that the production process of machining a tubular workpiece is complex in the prior art.
In order to achieve the aim, the invention provides a horizontal controllable atmosphere nitriding furnace, which comprises a horizontal furnace body, a heating assembly, a circulating cooling pipe fitting and a material conveying piece, wherein the circulating cooling pipe fitting and the material conveying piece are arranged around the inner side wall of the horizontal furnace body;
the conveying rail is arranged at the bottom of the horizontal furnace body along the length extending direction of the horizontal furnace body, the conveying frame is arranged on the conveying rail in a moving mode, a baffle is further arranged on one side of the conveying frame to seal the horizontal furnace body, the conveying frame is arranged in two rows, the workpiece placing frames are arranged on the upper side of the conveying frame in pairs to place workpieces, the stand column is fixedly connected with the upper side of the conveying frame, the flexible clamping jaws are distributed on two sides of the stand column, one end of each abutting spring is arranged on the inner side of each flexible clamping jaw, and the matching block is arranged at the other end of each abutting spring.
The material conveying part is additionally arranged, the installation efficiency of the tubular workpiece is improved by the material conveying part, so that the workpiece is conveyed into the horizontal furnace body by the conveying rail to carry out a nitriding process, the conveying vehicle frame is matched with the workpiece placing frame to realize the placing of the workpiece, the flexible clamping jaw is matched with the abutting spring and the matching block, after the tubular workpiece is placed inside the flexible clamping jaw, the abutting spring drives the matching block to move, the abutting fixing of the tubular workpiece can be realized, the rapid placing work of the tubular workpiece is further met, after the workpiece is placed, the workpiece is conveyed into the horizontal furnace body under the movement of the conveying vehicle frame, nitrogen is firstly filled, after the nitrogen filling is completed, the heating assembly is used for heating the horizontal furnace body to carry out a nitriding process, after the nitriding process is completed, the heating is stopped, the circulating cooling pipe fitting is started, the cooling of the horizontal furnace body is realized, and then the conveying vehicle frame is conveyed out of the horizontal furnace body to complete the nitriding process of the tubular workpiece.
The material conveying piece further comprises an expansion bracket, the expansion bracket is arranged on the inner side of the horizontal furnace body, and the expansion bracket drives the transport vehicle frame to move.
The telescopic frame drives the transportation vehicle frame to move along the conveying rail.
The material conveying piece further comprises a spacer, and the spacer is arranged between the adjacent workpiece placing frames to avoid collision of the tubular workpieces.
The spacing piece is arranged on the upper side of the transport vehicle frame and between the adjacent workpiece placing frames, so that workpieces placed on the workpiece placing frames are prevented from colliding, and the workpiece deformation is caused.
The telescopic frame comprises a telescopic cylinder and a connecting block, the telescopic cylinder is arranged on the inner side of the horizontal furnace body, and the output end of the telescopic cylinder is fixedly connected with the transport vehicle frame so as to control the transport vehicle frame to move.
The telescopic cylinder is fixed on the horizontal furnace body, the output end of the telescopic cylinder is used for driving the connecting block to move, the connecting block is fixedly connected with the transport vehicle frame, and the transport vehicle frame can move after the output end of the telescopic cylinder drives the connecting block to move, so that the transport vehicle frame is conveyed into the horizontal furnace body and conveyed out of the horizontal furnace body.
Wherein, the spacer includes the asbestos cloth and settles the frame, it sets up to settle the frame the upside of transportation frame, and set up adjacently between the work piece rack, the asbestos cloth sets up settle the inboard of frame to avoid the work piece to collide.
The asbestos cloth has higher ignition point, so that when the temperature in the horizontal furnace body rises, combustion cannot occur, and meanwhile, the asbestos cloth has better flexibility, so that the adjacent protection of the workpieces on the workpiece placing rack can be realized, and the adjacent condition that the workpieces on the workpiece placing rack deform due to collision is avoided.
The horizontal type controllable atmosphere nitriding furnace further comprises an air cooling piece, wherein the air cooling piece penetrates through the horizontal type furnace body so as to transfer low-temperature nitrogen to the interior of the horizontal type furnace body.
The air cooling part is used for achieving auxiliary cooling inside the horizontal furnace body, and the inside of the horizontal furnace body is enabled to achieve uniform cooling through inputting low-temperature nitrogen, so that the cooling speed is increased in an auxiliary mode.
Wherein, air-cooled spare includes air-cooled nest of tubes and vortex fan, air-cooled nest of tubes and external pump machine intercommunication, in order to transmit low temperature nitrogen gas in the horizontal furnace body, the vortex sets up the output of air-cooled nest of tubes is in order to disturb exhaust low temperature nitrogen gas.
The air cooling pipe set inputs low-temperature nitrogen into the horizontal furnace body through an external pump machine, so that the horizontal furnace body is filled with the low-temperature nitrogen, and part of the high-temperature nitrogen is discharged out of the horizontal furnace body under the action of pressure, thereby meeting the cooling requirement of the horizontal furnace body.
According to the horizontal type controllable atmosphere nitriding furnace, on the basis of the prior art, the structure of the nitriding furnace is improved, the nitriding furnace is changed into a horizontal furnace body, the material conveying piece is correspondingly additionally arranged, and the flexible clamping jaws are matched with the upright posts to improve the placement convenience of tubular workpieces, so that the placement efficiency of the tubular workpieces is improved, and the subsequent nitriding efficiency of the workpieces is also improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic axial view of a horizontal controlled atmosphere nitriding furnace according to a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional structural view of a horizontal controlled atmosphere nitriding furnace according to a first embodiment of the invention.
FIG. 3 is a schematic axial view of a material conveying member of a first embodiment of the horizontal controlled atmosphere nitriding furnace according to the present invention.
FIG. 4 is a schematic enlarged partial structural view of a material conveying member of a first embodiment of the horizontal controlled atmosphere nitriding furnace according to the present invention.
FIG. 5 is a schematic view of the horizontal furnace body of the second embodiment of the horizontal controlled atmosphere nitriding furnace according to the present invention.
FIG. 6 is a schematic cross-sectional view of a cooling circulation pipe and a shower head of a horizontal controlled atmosphere nitriding furnace according to a third embodiment of the present invention.
101-horizontal furnace body, 102-heating assembly, 103-circulating cooling pipe fitting, 104-material conveying piece, 105-conveying rail, 106-workpiece placing rack, 107-conveying vehicle frame, 108-upright column, 109-flexible clamping jaw, 110-abutting spring, 111-matching block, 112-baffle, 113-telescopic cylinder, 114-connecting block, 115-asbestos cloth, 116-placing frame, 201-air cooling pipe group, 202-turbulent flow fan, 301-connecting pipe and 302-liquid outlet head.
Detailed Description
The first embodiment:
referring to fig. 1 to 4, fig. 1 is a schematic axial view of a horizontal controlled atmosphere nitriding furnace according to a first embodiment, fig. 2 is a schematic sectional view of the horizontal controlled atmosphere nitriding furnace according to the first embodiment, fig. 3 is a schematic axial view of a material conveying member according to the first embodiment, and fig. 4 is a schematic partially enlarged structural view of the material conveying member according to the first embodiment.
The invention provides a horizontal controllable atmosphere nitriding furnace, which comprises a horizontal furnace body 101, a heating assembly 102, a circulating cooling pipe 103 and a material conveying piece 104, wherein the circulating cooling pipe 103 and the material conveying piece 104 are arranged around the inner side wall of the horizontal furnace body 101, the material conveying piece 104 comprises a conveying rail 105, two rows of workpiece placing frames 106 and a conveying frame 107, each workpiece placing frame 106 comprises an upright post 108 and a plurality of flexible clamping jaws 109, abutting springs 110 and matching blocks 111 are arranged on the inner sides of the flexible clamping jaws 109, and the material conveying piece 104 is arranged on the inner side of the horizontal furnace body 101 and is matched with the horizontal furnace body 101;
the conveying rail 105 is arranged in the bottom of the horizontal furnace body 101 in the length extending direction of the horizontal furnace body 101, the conveying frame 107 moves on the conveying rail 105, a baffle 112 is further arranged on one side of the conveying frame 107 to seal the horizontal furnace body 101, the conveying frame is arranged on two rows of the workpiece placing frames 106 which are arranged on the upper side of the conveying frame 107 in pairs to place workpieces, the upright posts 108 are fixedly connected with the upper side of the conveying frame 107, the flexible clamping jaws 109 are distributed on two sides of the upright posts 108, one ends of the abutting springs 110 are arranged on the inner sides of the flexible clamping jaws 109, and the matching blocks 111 are arranged at the other ends of the abutting springs 110.
The material conveying part 104 is additionally arranged, the material conveying part 104 is used for improving the installation efficiency of the tubular workpiece, so that the workpiece is conveyed into the horizontal furnace body 101 through matching with the conveying rail 105 to carry out a nitriding process, the conveying frame 107 is matched with the workpiece placing frame 106 to realize the placing of the workpiece, the flexible clamping jaws 109 are matched with the abutting springs 110 and the matching blocks 111, after the tubular workpiece is placed inside the flexible clamping jaws 109, the abutting springs 110 drive the matching blocks 111 to move, so that the tubular workpiece can be abutted and fixed, the rapid placing work of the tubular workpiece is further met, after the workpiece is placed, the workpiece is conveyed into the horizontal furnace body 101 through the movement of the conveying frame 107, nitrogen is charged firstly, after the nitrogen charging is completed, the heating assembly 102 is used for heating the horizontal furnace body 101 to carry out the nitriding process, after the nitriding process is completed, the heating is stopped, the circulating cooling pipe 103 is started to realize the cooling of the horizontal furnace body 101, and then the conveying frame 107 is conveyed out of the horizontal furnace body 101 to finish the nitriding process of the pipe type workpiece.
The material conveying member 104 further includes an expansion bracket disposed inside the horizontal furnace 101, and the expansion bracket drives the transportation vehicle frame 107 to move.
The telescopic frame drives the transport carriage 107 to move along the transport rail 105.
Secondly, the material transfer member 104 further includes a spacer disposed between the adjacent work piece placing frames 106 to avoid collision of the pipe-shaped work pieces.
The spacers are arranged on the upper side of the transport carriage 107 and between the adjacent workpiece placing racks 106, so that the workpieces placed on the workpiece placing racks 106 are prevented from colliding, and the deformation of the workpieces occurs.
Then, the telescopic frame comprises a telescopic cylinder 113 and a connecting block 114, the telescopic cylinder 113 is arranged on the inner side of the horizontal furnace body 101, and the output end of the telescopic cylinder 113 is fixedly connected with the transportation frame 107 so as to control the transportation frame 107 to move.
After the telescopic cylinder 113 is fixed on the horizontal furnace body 101, the output end of the telescopic cylinder 113 is used for driving the connecting block 114 to move, the connecting block 114 is connected and fixed with the transportation frame 107, and after the output end of the telescopic cylinder 113 drives the connecting block 114 to move, the transportation frame 107 can be moved, so that the transportation frame 107 is conveyed into the horizontal furnace body 101 and conveyed out of the horizontal furnace body 101.
Finally, the spacer includes asbestos cloth 115 and arrangement frame 116, it sets up to settle frame 116 the upside of transport vehicle frame 107, and set up adjacently between the work piece rack 106, asbestos cloth 115 sets up the inboard of settling frame 116 to avoid the work piece to collide.
The second embodiment:
referring to fig. 5 on the basis of the first embodiment, fig. 5 is a schematic view of the horizontal furnace body of the second embodiment of the horizontal controlled atmosphere nitriding furnace.
The horizontal controllable atmosphere nitriding furnace further comprises an air cooling piece, wherein the air cooling piece penetrates through the horizontal furnace body 101 to transmit low-temperature nitrogen to the inside of the horizontal furnace body 101.
The air cooling part is used for achieving auxiliary cooling inside the horizontal furnace body 101, and the inside of the horizontal furnace body 101 is enabled to be uniformly cooled through inputting low-temperature nitrogen, so that the cooling speed is increased in an auxiliary mode.
The air cooling part comprises an air cooling pipe group 201 and a turbulent flow fan 202, the air cooling pipe group 201 is communicated with an external pump machine to transmit low-temperature nitrogen gas in the horizontal furnace body 101, and turbulent flow is arranged at the output end of the air cooling pipe group 201 to disturb the discharged low-temperature nitrogen gas.
The air cooling pipe set 201 inputs low-temperature nitrogen into the horizontal furnace body 101 through an external pump machine, so that the low-temperature nitrogen fills the horizontal furnace body 101, and part of the high-temperature nitrogen is discharged out of the horizontal furnace body 101 under the action of pressure, so that the cooling requirement of the horizontal furnace body 101 is met, the air cooling pipe set 201 transmits the low-temperature nitrogen, and the turbulent fan 202 disturbs the movement direction of the low-temperature nitrogen, so that the low-temperature nitrogen can be distributed in the whole horizontal furnace body 101.
The third embodiment:
referring to fig. 6 based on the first embodiment, fig. 6 is a schematic cross-sectional view of a circulation cooling pipe and a shower head of a third embodiment of a horizontal controlled atmosphere nitriding furnace.
The horizontal controllable atmosphere nitriding furnace also comprises a spray header, and the spray header is communicated with the circulating cooling pipe 103 to discharge cooling water into the horizontal furnace body 101;
the spray header comprises a connecting pipe 301 and a liquid outlet head 302, the connecting pipe 301 is communicated with the circulating cooling pipe 103 positioned on the upper side inside the horizontal furnace body 101 so as to transmit cooling water to the liquid outlet head 302, and the liquid outlet head 302 is communicated with the connecting pipe 301 so as to spray out the cooling water.
The shower head is used for spraying cooling water from the circulating cooling pipe 103, so that the internal cooling speed of the horizontal furnace body 101 is increased, the cooling water can be liquefied into mist after heat absorption and is discharged out of the horizontal furnace body 101, and when subsequent nitriding is carried out, even if a small amount of cooling water remains in the horizontal furnace body 101, the part of cooling water can be mixed with nitrogen gas in a mode of heating the nitrogen gas and is discharged out of the horizontal furnace body 101 along with the nitrogen gas.
According to the horizontal type controllable atmosphere nitriding furnace, on the basis of the prior art, the structure of the nitriding furnace is improved, the nitriding furnace is changed into a horizontal furnace body 101, the material conveying part 104 is correspondingly added, and the flexible clamping jaws 109 are matched with the upright posts 108 to improve the placing convenience of tubular workpieces, so that the placing efficiency of the tubular workpieces is improved, and the subsequent nitriding efficiency of the workpieces is also improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A horizontal controllable atmosphere nitriding furnace comprises a horizontal furnace body, a heating component and a circulating cooling pipe fitting arranged around the inner side wall of the horizontal furnace body, and is characterized in that,
the material conveying piece is arranged on the inner side of the horizontal furnace body and is matched with the horizontal furnace body;
the material conveying piece comprises a conveying rail, two rows of workpiece placing frames and a conveying frame, wherein the conveying rail is arranged along the length extending direction of the horizontal furnace body and is arranged at the bottom of the horizontal furnace body, the conveying frame is arranged on the upper side of the conveying rail and moves, a baffle is further arranged on one side of the conveying frame to seal the horizontal furnace body, and the workpiece placing frames are arranged in pairs and are arranged on the upper side of the conveying frame to place workpieces, each workpiece placing frame comprises a stand column and a plurality of flexible clamping jaws, the stand column is fixedly connected with the upper side of the conveying frame, the flexible clamping jaws are distributed on two sides of the stand column, the inner sides of the flexible clamping jaws are provided with abutting springs and matching blocks, one ends of the abutting springs are arranged on the inner sides of the flexible clamping jaws, and the matching blocks are arranged at the other ends of the abutting springs.
2. The horizontal controlled atmosphere nitriding furnace according to claim 1,
the material conveying piece further comprises an expansion bracket, the expansion bracket is arranged on the inner side of the horizontal furnace body, and the expansion bracket drives the transport vehicle frame to move.
3. The horizontal controlled atmosphere nitriding furnace according to claim 2,
the material conveying piece further comprises a spacer which is arranged between the adjacent workpiece placing frames so as to avoid collision of the tubular workpieces.
4. The horizontal controlled atmosphere nitriding furnace according to claim 3,
the telescopic frame comprises a telescopic cylinder and a connecting block, the telescopic cylinder is arranged on the inner side of the horizontal furnace body, and the output end of the telescopic cylinder is fixedly connected with the transportation vehicle frame so as to control the transportation vehicle frame to move.
5. The horizontal controlled atmosphere nitriding furnace according to claim 4,
the spacer includes the asbestos cloth and settles the frame, it sets up to settle the frame the upside of transportation frame, and set up adjacent between the work piece rack, the asbestos cloth sets up settle the inboard of frame to avoid the work piece to collide.
6. The horizontal controlled atmosphere nitriding furnace according to claim 5,
the horizontal controllable atmosphere nitriding furnace further comprises an air cooling part, wherein the air cooling part penetrates through the horizontal furnace body to transfer low-temperature nitrogen to the interior of the horizontal furnace body.
7. The horizontal controlled atmosphere nitriding furnace according to claim 6,
the air cooling part comprises an air cooling pipe group and a turbulent flow fan, the air cooling pipe group is communicated with an external pump machine to transmit low-temperature nitrogen gas into the horizontal furnace body, and the turbulent flow is arranged at the output end of the air cooling pipe group to disturb the discharged low-temperature nitrogen gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210938173.2A CN115287585A (en) | 2022-08-05 | 2022-08-05 | Horizontal controllable atmosphere nitriding furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210938173.2A CN115287585A (en) | 2022-08-05 | 2022-08-05 | Horizontal controllable atmosphere nitriding furnace |
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| CN115287585A true CN115287585A (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210938173.2A Pending CN115287585A (en) | 2022-08-05 | 2022-08-05 | Horizontal controllable atmosphere nitriding furnace |
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| CN205258583U (en) * | 2015-11-26 | 2016-05-25 | 盐城丰东特种炉业有限公司 | Gas nitriding stove equipment |
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