1 With the rapid development of the coal industry, coal mine excavation equipment is also facing low fires. Although carburizing and quenching can make the tooth surface reach a high level of contact fatigue, a speed, heavy load, and at the same time its transmission parts, strength High bending strength and good wear resistance, but the requirements of heat treatment weeks such as gear shafts are also increasing. In order to ensure long life of heavy-duty gear shafts and large quenching distortions, the industrialized countries in the world are producing large products; they often work under relatively heavy loads without early failure, and must harden the tooth surfaces so that the tooth surfaces are good The flexural strength of the contact fatigue strength with high abrasion resistance and the sufficient strength and toughness of the heart.
In the world's most advanced industrialized countries, the heavy-duty heavy-duty gear shafts are made of alloy steel, and the tooth surfaces are hardened. Heavy Machinery Group Co., Ltd. cooperated with Hassfield USA and India Co., Ltd. to produce a 2800 excavator drive mechanism for the Pingshuo open-pit coal mine. 1. There is a kind of gear shaft with a modulus of 33.8. Only the company adopts only 2 steels, namely the United States imports 1514340 steel. Equivalent to China 40, State 2, and its chemical composition, such as the size of the part of the technical requirements of the matrix excavator large modulus gear shaft along the tooth groove intermediate frequency quenching Zhang Guoli Zhang Weidong China Heavy Machinery Group Guo Feng Jiang Wenjie Heilongjiang Qiqihar 161042 modulo overloaded Gear shaft gradually began to use induction hardening, quenching method and characteristics 3. Along the tooth surface medium frequency quenching only hardening tooth surface, the hardened layer is broken at the tooth root, although the tooth surface contact fatigue strength is high, but the bending resistance of the teeth The strength is very low and it is easy to break teeth at the tooth roots. Along the tooth groove, the entire tooth profile of the intermediate frequency quenching is evenly hardened. The tooth surface has good contact fatigue strength and very high bending strength. The tooth surface hardness is HRC, 5, and the deep tooth profile of the hardened layer is evenly distributed.
The large modulus gear shaft of the excavator is supplied directly by the company only. It has realized localization at an early date and has carried out technical research for the group company. It has achieved good results and has achieved only the technical requirements of the company.
I 1 Heavy-duty gear shaft tooth surface hardening Hardened gear shaft is divided into soft tooth surface hard tooth surface and hard name tooth surface according to its working conditions, tooth surface hardness range 2 tooth surface hardness range around 23 heavy load gear shaft two inches Two 81 yo!
Due to the poor working conditions, soft stomach and medium hard tooth surfaces are far below the performance required for heavy gear shafts. Therefore, large modulus heavy-duty gear shafts often use surface hardening and carburizing quenching heat treatment methods to strengthen the tooth surface. Induction heating surface quenching I3 large modulus heavy duty gear shaft quenching method and characteristics K fire method contact fatigue bending fatigue cycle quenching cost labor intensity strength deformation `Great. Long, high-edge teeth, medium-frequency quenching, high, low, short, short, and high teeth along the quenching height, height, small, and short; if the two measurements of the armature current of the two-wheel motor are not much different, the two shunts need to be removed at the same time. Inspection, if it is true, you must replace the two shunts at the same time.
Il Here's a simple way to verify the diverter. Find a new standard diverter, connect it in series with the diverter to be tested, pass a constant DC current, and measure the voltage at the measuring terminal of the diverter with millivolts. If people's currents are added, the measured voltage values ​​will differ by about one, indicating that the diverter's detection error to be tested is too large to be used.
Along the tooth flank and the tooth groove along the intermediate frequency quench hardened layer 2. Therefore, along the tooth groove intermediate frequency quenching is a good way to harden the tooth surface. Under the condition of ensuring the normal service life of the heavy-duty heavy-duty gear shaft, it is economical and reasonable to use the intermediate frequency quench hardened tooth surface along the tooth groove.
The Pinghu equipment uses the Taiwan 2633000 CNC gear quenching machine imported from Germany, 64,103 companies, which has a power of 120kW and a frequency of 810kHz and uses a SCR inverter. The machine tool solves the problem that the uniform motion causes the ends of the tooth groove to be quenched and not lit due to the quenching temperature being too low, or the common quenching machine tool due to the heating temperature quenching cracking is commonly asked, and the quenching start position is designed to have a short pause. Segments, and fast segments at the end of the quench.
2.2 Sensor Design The low level of sensor design and fabrication is critical to the quality of tooth-to-tooth quenching along the tooth gap. According to the tooth profile calculation method described in the literature 1, the shape structure introduced in the literature 2 and combined with the design and manufacturing method 3 of the sensor introduced by the company named Germany, the induction is determined according to the effect of heating and cooling of the gear shaft groove and tooth surface. The gap between the gear and the gear teeth is designed as a special sensor with a modulus of 33.8. The water sprayer uses 4 conclusions after more than 4 years of experiments to prove that whether it is a running electric wheel car or an overhauled electric wheel car, the diverter is treated by the above two methods and the power system caused by the diverter detection error. The phenomenon of dynamic soft failure no longer appears, to ensure the safety of students; production. Mouth more than 31 mouth water hole form. And with the adjacent cooling tower. Chess defeated 33.8 gear shaft along the groove by tooth quenching, å™± should be tooth-shaped field 3. Sensuality test piece steel used, 5 atmospheric cast. Ingredients 4.
1 Test piece 妗 Post-creation mechanical properties 5 According to the number of chess pieces 33.8 Gear shaft meshing characteristics plus 1 Workpiece ratio of 1 test piece, mouth, public net production of PAC poly B drunk water based quenching; 33.8 dedicated sensor Ya! Quenching machine tool on the 33, the gear shaft was made several times along the groove in the quenching test, set the most accompanied by the loss of the solution through the solution to check the quenching hardness and quenched Niduo have reached, 4 closed large Process, 1 heat quenching Qisaki, between the various parts of the gums should be selected properly. Guarantee tooth bottom. The tooth surface and tip are evenly heated. Therefore, the hardness after quenching and quenching with a deep and even uniformity are almost non-existent.
Bao, the time heating after the explosion of 7 trials, pieces, the fire of the low-lying film that is quenched so that the critical point of the embarrassing, especially 4,3 have different ways of parliament is also very little for the 40012, this phosphor alloy Steel contains more homes. In order to make the total Yuan more full of water in the Austenitic Wolfberry to ensure hardenability, high degree of quenching, but the net attention not to make the quenching sister is too high so tune induction! 1 movement speed. The Austenite is sufficiently austenitized, and not igniting the product is a closed hydrocarbon test that guarantees the suspicion of the bonfire. It is proved that the mobile tanned school can achieve the best quenching at around 32,1. effect. In addition, increase the preheating before quenching. Not only can increase the depth of heat. , Effectively inverting the depth of antiquities; also å€ å€ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ å›å¨´æ‘¹ 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 禅 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
At the same time, due to the use of multi-row holes in the plant, water appliances. To make the tooth surface cool for a long time, prompting the change of the residual coder body to progressive martensite. Thus obtained from the quench hard, 2.5.3 original simmered flaming according to the data 4 mediation 3 fine proud, uniform grain distribution in the iron body in the brewing sister woven, in induction heating, can be lower, under Degenerates into austenite and homogenizes faster. However, the spherules of spherules have a detrimental effect on induction hardening. When heated in the sense position. There are enough, chemical, and austenite. Must use a higher degree of quenching. This will lead to grain coarsening and martensite formation after the fire. And there are more residual austenite, resulting in surface hardness, low and more so. In the heat treatment process before quenching, the base fabric should be prepared so that it can obtain uniform and fine Seiko's sister-in-law and make full preparations for weaving.
3 Conclusions: The trials and the quenching of enamel shall be based on technical requirements. Hardened calendar hardness! Fluctuations around the curve 5. Induction and gear teeth between the soft parts 6. After the test piece quenched! Good quenching process failures and test results are listed in 6, test pieces quenched and fire-retarded low-power photographs 73 2.5 Results analysis 2.5. Total blackness and general induction heating. The conditions for the heat transfer of each person in the Rotary Hills are uneven. That is, the heating effect of the tooth top is excellent and the cooling effect is not as good as the tooth root. In addition, the two teeth of the near-toothed lang, the cause of the tooth roots and the dome but caused the magnetic flux concentration. Therefore, the use of induced seizures should enable the scores of dynasty hunters to increase by 1 from the top arbitrarily determined tooth roots, and the design and production level of the low lev- els should have a significant effect on the number of heavy worm gears along the tooth gingival quenching shield. The game fully considers the sensed nose station structure, the carcass structure sensor and the gear tooth, and between the various parts of the Euro 2 choose the appropriate degree of quenching so that the Nyday is relatively austenitized and the grain is not coarsened. To ensure the quenching, the degree of quenching the matrix of the quenching house is a small failure of the telluride, and the grains are evenly distributed in the iron wire body. The best micro structure can be increased by the preheating before the quenching, and (3) using multiple rows. The strong water spray of the hole can make austenite fully change to Shih Shu. In order to lift off the degree of quenching along the tooth gap.
6 The use of an ortho-derivative can effectively prevent the adjoining teeth from tempering along the indentation in the tooth groove to temper 7 in the induction design. Quench failed to choose the right circumstances. The use of along the trochlear trembling quenching and filling can produce a high set of hard teeth and Zuoren shaft, Cowen, 1 Sun Yiwu along the ditch climbing Taotao fire, temple, set up the lotus leaves and leaves gold and hot Dunao.
2 Outer Wu Da, number 4 Qugou single track, fire, should be set at 0. Full, 1st, sensational pressure anatomy dissertation. 992.
4 Alloy 1 hand, hold the metal work out 茇 Du. Mouth for this, should be the nose structure. Dental magnet structure and induction and rotation
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