CN212316227U - QPQ low temperature direct current electric field nitriding device - Google Patents
QPQ low temperature direct current electric field nitriding device Download PDFInfo
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- CN212316227U CN212316227U CN202020932734.4U CN202020932734U CN212316227U CN 212316227 U CN212316227 U CN 212316227U CN 202020932734 U CN202020932734 U CN 202020932734U CN 212316227 U CN212316227 U CN 212316227U
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Abstract
The utility model discloses a QPQ low temperature direct current electric field nitriding device, including the furnace body that has reaction space, with the direct current electric field and the control system of reaction space intercommunication, direct current electric field includes the power and connects the power with reaction space's first wire and second wire, the one end of first wire with the positive pole of power is connected, and the other end is fixed with work piece formula appearance piece, the one end of second wire with the negative pole of power is connected, and the other end is fixed with the carbon-point, the during operation, pack partial salt bath base liquid in the reaction space, work piece formula appearance piece reaches the carbon-point soaks and locates in the salt bath base liquid. Compared with the prior art, the utility model provides a QPQ low temperature direct current electric field nitriding device more is favorable to the absorption of nitrogen atom for the formation of nitriding layer can show and shorten the nitriding time, can effectively restrain the passive tempering of work piece simultaneously, does not have the influence to base material's obdurability.
Description
Technical Field
The utility model relates to a metal surface chemical heat treatment technical field, concretely relates to QPQ low temperature direct current electric field nitriding device.
Background
The QPQ (Quench-Polish-Quench) technology is a metal surface modification technology used for improving the hardness, the wear resistance and the corrosion resistance of steel, and the main procedures are salt bath nitriding (salt bath nitrocarburizing) and salt bath oxidizing. The salt bath nitriding temperature is higher when the conventional QPQ technology is used for treatment, and is usually more than 500 ℃.
The high-temperature salt bath can cause that the hardness of the core of some carbon steel or alloy steel with low tempering or hardening and tempering temperature is reduced after QPQ treatment, and further the overall performance of parts can be influenced, particularly for some parts with low tempering temperature, salt bath tempering is caused by the high-temperature salt bath, and the toughness of machine body materials is influenced.
If the infiltration layer obtained by the QPQ process under the low-temperature condition is extremely thin, the requirements of parts requiring high hardness and high wear resistance cannot be met; and the thickness of a permeable layer can be improved by adopting long-time low-temperature nitriding, but the permeable layer is loosened, the efficiency is low, and the cost is greatly improved.
Therefore, there is a need to provide a QPQ low-temperature dc electric field nitriding apparatus which is more favorable for adsorption of nitrogen atoms, accelerates formation of a nitrided layer, can significantly shorten the nitriding time, can effectively suppress passive tempering of a workpiece, and has no influence on toughness of a base material, to solve the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a more be favorable to the absorption of nitrogen atom for the formation of nitriding layer can show and shorten the nitriding time, can effectively restrain the passive tempering of work piece simultaneously, does not have the QPQ low temperature direct current electric field nitriding device of influence to base material's obdurability.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a QPQ low temperature direct current electric field nitriding device, including the furnace body that has reaction space, with the direct current electric field and the control system of reaction space intercommunication, direct current electric field includes the power and connects the power with reaction space's first wire and second wire, the one end of first wire with the positive pole of power is connected, and the other end is fixed with work piece formula appearance piece, the one end of second wire with the negative pole of power is connected, and the other end is fixed with the carbon-point, and during operation, pack partial salt bath base liquid in the reaction space, work piece formula appearance piece reaches the carbon-point soaks and locates in the salt bath base liquid.
Preferably, the control system comprises a temperature control box, a thermocouple arranged in the reaction space and communicated with the temperature control box, an automatic timer connected with the temperature control box and an automatic alarm connected with the automatic timer.
Preferably, the volume ratio of the salt bath base liquid to the reaction space is maintained between 2/3 and 3/4.
Preferably, the furnace body comprises a body part enclosing the reaction space, a resistance wire fixedly connected with the body part and arranged in the reaction space, and a heat insulation layer arranged between the body part and the resistance wire, wherein at least part of the resistance wire is immersed in the salt bath base solution.
Preferably, the surfaces of the resistance wires and the surface of the heat insulation layer close to one side of the reaction space are coated with an anticorrosive coating.
Preferably, the heat insulation layer is a fireproof brick.
Preferably, the dc electric field further includes an insulating support rod disposed between the first conductive line and the second conductive line, and the insulating support rod is made of ceramic.
In summary, compared with the prior art, the utility model provides a QPQ low temperature direct current electric field nitriding apparatus, through setting up direct current electric field and control system, through control system control the temperature of salt bath base liquid in the reaction space, guarantee that the work piece is in the low temperature nitriding environment, avoid some tempering or the low carbon steel or alloy steel of quenching and tempering temperature to reduce in the back core hardness of handling, guaranteed substrate material's obdurability; meanwhile, under the condition of electrification, the concentration of active nitrogen atoms around the workpiece can be greatly increased, so that the nitriding speed is accelerated, and the thickness of a nitriding layer is increased; through increase between first wire with the second wire insulating support rod utilizes insulating support rod keeps apart first wire with the second wire, has avoided the contact of two wires, has promoted the security of QPQ low temperature direct current electric field nitriding device.
Drawings
Fig. 1 is a schematic plan structure diagram of a QPQ low-temperature direct-current electric field nitriding apparatus provided by the present invention;
figure 2 this adoption utility model provides a QPQ low temperature direct current electric field nitriding process flow chart of device.
In the figure, a 100 QPQ low-temperature direct current electric field nitriding device; 10. a furnace body; 11. a body portion; 12. a resistance wire; 13. a thermal insulation layer; 20. a direct current electric field; 21. a power source; 22. a first conductive line; 23. a second conductive line; 24. an insulating support rod; 30. a control system; 31. a temperature control box; 32. a thermocouple; 101. a reaction space; 102. a workpiece type sample block; 103. a carbon rod.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. The following experimental examples and examples are intended to further illustrate but not limit the invention.
Referring to fig. 1 and fig. 2, the present invention provides a QPQ low-temperature dc electric field nitriding apparatus 100. The QPQ low-temperature dc electric field nitriding apparatus 100 includes a furnace body 10 having a reaction space 101, a dc electric field 20 communicating with the reaction space 101, and a control system 30. The temperature of the salt bath base liquid in the reaction space 101 is controlled by the control system 30, the workpiece is ensured to be in a low-temperature nitriding environment, the hardness of the center of the processed carbon steel or alloy steel with low tempering or hardening and tempering temperature is prevented from being reduced, the toughness of the base material is ensured, and meanwhile, the nitriding efficiency of the device is increased by the direct current electric field 20, and the thickness and hardness of the surface diffusion layer of the workpiece are increased.
Specifically, the furnace body 10 includes a body 11 enclosing the reaction space 101, a resistance wire 12 fixedly connected to the body 11 and disposed in the reaction space 101, and a heat insulating layer 13 disposed between the body 11 and the resistance wire 12. Wherein, the resistance wire 12 is at least partially immersed in the salt bath base solution.
Preferably, in order to prolong the service life of the furnace body 10, the surfaces of the resistance wires 12 and the surface of the heat-insulating layer 13 close to the reaction space 101 are coated with anticorrosive coatings. Specifically, in the present embodiment, the heat insulating layer 13 is a fireproof brick.
The dc electric field 20 includes a power source 21, a first conductive wire 22 and a second conductive wire 23 connecting the power source 21 and the reaction space 101, and an insulating support rod 24 disposed between the first conductive wire 22 and the second conductive wire 23.
One end of the first wire 22 is connected to the anode of the power supply 21, and the other end is fixed with a workpiece pattern block 102. One end of the second wire 23 is connected to the cathode of the power supply 21, and the other end is fixed to a carbon rod 103. During work, the reaction space 101 is filled with partial salt bath base liquid, and the workpiece type sample block 102 and the carbon rod 103 are immersed in the salt bath base liquid. The principle of the direct current electric field 20 for promoting nitriding is as follows:
there are three basic processes in the QPQ nitridation process, namely decomposition, adsorption and diffusion of active nitrogen atoms. The generation formula of the active nitrogen atom depends on the decomposition of CNO-anion in salt bath, namely the following two reactions:
when the power is turned on, the workpiece pattern block 102 is connected to the positive electrode of the power supply 21, and CNO ions in the salt bath base solution are attracted by positive charges and approach the workpiece pattern block 102, so that a large number of CNO ions are present around the workpiece pattern block 102 and have a higher concentration than those around the workpiece when the power is not turned on. Therefore, when CNO-ions are subjected to decomposition reaction, the concentration of active nitrogen atoms around the electrified workpiece pattern sample block 102 is also increased, so that the nitriding speed is higher, and a permeated layer is thicker.
However, when the voltage is too high (more than 7V), the workpiece pattern block 102 may attract more CNO-ions to approach, and even some CNO-ions may attach to the surface of the workpiece pattern block 102, when the CNO-ions are decomposed, a large amount of active nitrogen atoms around the workpiece pattern block 102 may be accumulated to form a high nitrogen potential, and although the diffusion layer is thick in a short time, the surface may be severely loosened due to the too high content of nitrogen in the compound layer.
Similarly, O2-ions in the salt bath are attracted by positive charges and approach or attach to the surface of the workpiece pattern sample block 102, and at this time, iron atoms diffuse from the compound layer to the surface to form Fe3O4, which also causes redistribution of internal nitrogen atoms, is more favorable for adsorption of nitrogen atoms, accelerates formation of a nitriding layer, and further achieves a catalytic effect. Meanwhile, at the low temperature of 450 ℃, the CNO-ions are decomposed very slowly only by heat, and under the action of the direct current electric field 20, additional energy is provided for the decomposition of the CNO-ions, so that the CNO-ions are decomposed at a higher speed, and the active nitrogen atom concentration is higher.
Specifically, in the present embodiment, the penetration layer can reach 18um, which is 7.5 times the thickness of the penetration layer without the dc electric field 20, and 17 hours is required to reach 18um without the dc electric field 20. Meanwhile, after a 5V direct current electric field is introduced for acting for 2 hours at the low temperature of 450 ℃, the surface hardness of the workpiece type sample block 102 reaches 813HV, which is 1.3 times higher than that of the QPQ process when the power is not supplied.
Specifically, in this embodiment, the insulating support rod 24 is made of ceramic, and the insulating support rod 24 is used to isolate the first conducting wire 22 from the second conducting wire 23, so as to avoid contact between the two conducting wires, and improve the safety of the QPQ low-temperature dc electric field nitriding apparatus 100.
Preferably, in order to further improve the safety of the apparatus and also to facilitate the control of the temperature of the salt bath base liquid, in the present embodiment, the volume ratio of the salt bath base liquid to the reaction space 101 is maintained between 2/3 and 3/4.
The control system 30 includes a temperature control box 31, a thermocouple 32 disposed in the reaction space 101 and communicated with the temperature control box 31, an automatic timer (not shown) connected to the temperature control box 31, and an automatic alarm (not shown) connected to the automatic timer.
The temperature control box 31 is connected with the resistance wire 12 and used for adjusting the current of the resistance wire 12, so that the purpose of controlling the temperature of the salt bath base liquid is achieved. The thermocouple 32 is used for sensing the temperature of the salt bath base liquid and transmitting the real-time temperature information of the salt bath base liquid to the temperature control box 31.
The automatic timer is used for controlling the reaction time of the book searching workpiece type sample block 102, and when the reaction time is over, the automatic alarm gives an alarm to remind a worker to replace the workpiece type sample block 102.
The utility model provides a QPQ low temperature direct current electric field nitriding device 100's work flow as follows:
step S10, preheating, namely preheating the workpiece pattern sample block 102 at the temperature of 400 ℃ until the surface of the workpiece pattern sample block is yellow or purple;
s20, nitriding, namely putting the preheated workpiece type sample block 102 into a direct-current electric field salt bath nitriding furnace, and adjusting voltage at the same time, wherein the anode of a direct-current electric field 20 is a workpiece, the cathode of the direct-current electric field is a carbon rod, the anode and the cathode are not in contact with each other, and the temperature in the direct-current electric field salt bath nitriding furnace is not higher than 500 ℃;
and step S30, oxidizing and polishing, namely rinsing the oxidized workpiece with clean water and then mechanically polishing.
Compared with the prior art, the utility model provides a QPQ low temperature direct current electric field nitriding device through setting up direct current electric field reaches control system, through control system control the temperature of salt bath base liquid in the reaction space, guarantees that the work piece is in the low temperature nitriding environment, avoids some tempering or the low carbon steel or alloy steel of quenching and tempering temperature to reduce at the back core hardness of handling, has guaranteed substrate material's strong toughness; meanwhile, under the condition of electrification, the concentration of active nitrogen atoms around the workpiece can be greatly increased, so that the nitriding speed is accelerated, and the thickness of a nitriding layer is increased; through increase between first wire with the second wire insulating support rod utilizes insulating support rod keeps apart first wire with the second wire, has avoided the contact of two wires, has promoted the security of QPQ low temperature direct current electric field nitriding device.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should be construed as the scope of the present invention.
Claims (7)
1. The utility model provides a QPQ low temperature direct current electric field nitriding device, its characterized in that, including the furnace body that has reaction space, with the direct current electric field and the control system of reaction space intercommunication, direct current electric field includes the power and connects the power with reaction space's first wire and second wire, the one end of first wire with the positive pole of power is connected, and the other end is fixed with work piece formula appearance piece, the one end of second wire with the negative pole of power is connected, and the other end is fixed with the carbon-point, and during operation, pack partial salt bath base liquid in the reaction space, work piece formula appearance piece reaches the carbon-point soaks and locates in the salt bath base liquid.
2. The QPQ low-temperature direct-current electric field nitriding device according to claim 1, wherein the control system comprises a temperature control box, a thermocouple arranged in the reaction space and communicated with the temperature control box, an automatic timer connected with the temperature control box and an automatic alarm connected with the automatic timer.
3. The QPQ low-temperature direct current electric field nitriding device according to claim 1, wherein the volume ratio of the salt bath base solution to the reaction space is maintained between 2/3 and 3/4.
4. The QPQ low-temperature direct-current electric field nitriding device according to claim 2, wherein the furnace body comprises a body portion surrounding the reaction space, a resistance wire fixedly connected with the body portion and arranged in the reaction space, and a heat insulation layer arranged between the body portion and the resistance wire, wherein the resistance wire is at least partially immersed in the salt bath base solution.
5. The QPQ low-temperature direct current electric field nitriding device according to claim 4, wherein the surfaces of the resistance wires and the surface of the heat insulation layer on the side close to the reaction space are coated with an anticorrosive coating.
6. The QPQ low-temperature direct current electric field nitriding device according to claim 5, wherein the thermal insulation layer is a fireproof brick.
7. The QPQ low-temperature direct current electric field nitriding device of claim 1, wherein the direct current electric field further comprises an insulating support rod arranged between the first conducting wire and the second conducting wire, and the insulating support rod is made of ceramic.
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| CN202020932734.4U CN212316227U (en) | 2020-05-28 | 2020-05-28 | QPQ low temperature direct current electric field nitriding device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455310A (en) * | 2020-05-28 | 2020-07-28 | 湖南申亿五金标准件有限公司 | QPQ low-temperature direct-current electric field nitriding process and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455310A (en) * | 2020-05-28 | 2020-07-28 | 湖南申亿五金标准件有限公司 | QPQ low-temperature direct-current electric field nitriding process and device |
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Address after: 410000 room 406, building 10, phase IV, No. 188, Huanbao Middle Road, Yuhua District, Changsha City, Hunan Province Patentee after: Hunan Shenyi precision parts Co.,Ltd. Address before: 410000 room 406, building 10, phase IV, No. 188, Huanbao Middle Road, Yuhua District, Changsha City, Hunan Province Patentee before: Hunan Shenyi Hardware Standard Parts Co.,Ltd. |
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