| Home>Bearing knowledge>Use of plasma nitriding skills in crankshaft production (2) |
The use of plasma nitriding skills in crankshaft production (2)
Source: Bearing network time: 2018-05-01
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
1, high temperature steam plus scavenger scrub and then add high temperature steam rinse brush, 2, active remover to remove, 3, gasoline wipe.
The third method is a workaround when production conditions are not available; it is only suitable for small-scale removal.
2. The nitriding process ion nitriding process parameters are usually:
Uniform heating rate 100 ° C / hour, holding temperature: 540 ~ 580 ° C, holding time: 6 ~ 8 hours. Ion soft nitriding process parameters are usually: uniform heating rate 100 ° C / hour, holding temperature: 540 ~ 570 ° C Between, the holding time: 3 to 4 hours.
Third, the quality control in the process of crankshaft nitriding 1. The quality of the removal and removal will directly affect the handling quality of the crankshaft and the extended disposal cycle.
If the crankshaft is dirty, it will greatly extend the arcing cycle; a certain manufacturer will extend to more than 12 hours due to the unclear arcing of the crankshaft. The surface of the crankshaft after disposal has many carbon blacks attached; it affects both the appearance of the product and the quality of the product. After the improved cleaning process; the arcing time is greatly shortened; the disposal quality is also greatly improved. According to our experience in handling the channel plate on the diesel oil pump of Dongfeng Automobile Pump Factory; the external hygiene is easy to form a continuous layer of compound with a relatively uniform thickness. On the contrary, it is not easy to form a compound layer with uniform and uniform thickness. While ion nitriding, the compound layer has a greater contribution to hardness, wear resistance and fatigue resistance.
We believe that this is primarily because the carbon black formed by the unclean appearance exists as free carbon; it affects the activation of the exterior of the part; it prevents nitriding.
2. The device ion nitriding has many advantages compared with the traditional nitriding process; however, because of the particularity of its vacuum discharge, it has brought a big disadvantage. The fading fading is indeed the edge of the blade. It is because the shape of the external appearance of the part will affect the dispersion of the external current density; power saving; provincial data; energy consumption. Tiger èŠªè— å»´ å»´ å»´ å»´ 鹊.
Parts that pass ion-nitriding; their appearance is high; the functions of fatigue resistance and wear reduction are improved.
Fourth, the current state of the ion nitriding process of the crankshaft is similar to the disposal of other nitriding parts; the ion nitriding process of the crankshaft is usually carried out by blowing, squeezing, squeezing and blowing for 4 periods; including the furnace; roughly taking 18 Hours. Different manufacturers have slightly different ion nitriding processes.
About deformation; only aging treatment is good (about 2 to 4 hours); even warming can ensure the deformation is better than the 徊裼 У У У 嶂嵯蛱 悴 3 3 3 3 3 3.
Regarding soft nitriding; Dalian diesel engine plant adopts ammonia gas plus acetone method; the heat preservation time is about 5 hours, according to the fact that ion soft nitriding is slightly larger than nitriding deformation; according to our disposal of channel plate and drive ring at Dongfeng Automobile Manufacturing Plant The experience: the choice of ammonia and propane gas for ion soft nitriding treatment; process process is more simple control.
Compared with the high-power pulse power supply developed by me; the uniform power has been above 120A; the demand for nitriding of 150KW furnace body has been satisfied. The new pulse power supply has better stability and reliability than the power supply. Because the current limiting resistor is omitted; only one item can save about 20%; plus other characteristics of the pulse power supply; under certain conditions; the power saving can be up to 50%. The pulse power supply is selected; the arcing time is shortened; The oil hole can be blocked, so that the auxiliary furnace is shortened at the same time; the power supply operation is simple; easy to control.
V. Conclusion The ion nitridation process on the crankshaft product is relatively advanced in skill; the nitriding quality is superior to the traditional gas nitriding; some problems found in the process of equipment use are also briefly explained and processed; The successful development of the pulse power supply has shortened the auxiliary furnace time; the arc cleaning time is shortened; the energy is saved; many advantages of the ion nitriding process will be known to more and more crankshaft manufacturers. I would like to work with the crankshaft manufacturers; Improve equipment and processes; we should do our best to improve the quality of crankshaft products.
Recommend to friends comments close window
| Bearing related knowledge |
| Four key points for correct force application when assembling and disassembling fag bearings Analysis of the characteristics of the raceway noise of NSK bearings PVD skills in the bearing profession use motor bearing overheating reasons and disposal methods Common terms and definitions of bearings (13) |
This article links to http://
Please indicate China Bearing Network http://
Previous: Common terms for bearings (2)
Next: Power, transmission system, abnormal noise, personal identification
used for machinery , automobile , bicycle ,furniture and components for other machines.
Cold Drawn Seamless Mechanical Tube (CDS) is a cold drawn 1020 steel tube. Produced from piercing hot rolled bar stock, the cold drawing process increases the tube's physical properties reducing the cost of machine time. Cold drawn seamless tubing provides a better uniformed OD and ID, enhanced machinability, increased strength, and tighter tolerances compared to hot finish seamless products.
Benefits of Cold Drawn Seamless Mechanical Tube:
Mechanical Tube
C45 bicycle part and auto part steel pipe
Liaocheng Xinglong Seamless Tube Manufacturing Co., Ltd. , https://www.lcxlpipe.com