Introduction to the crankshaft oil plug assembly effect on crankshaft dynamic balance

Introduction to the crankshaft oil plug assembly effect on crankshaft dynamic balancing - 2019 08 - 13 and Yang ( CSR qi shuyan locomotive co. , LTD. , changzhou 213000) Abstract: the division 16 v280 crankshaft undergoes dynamic balance in the process of manufacturing process validation may be used as nonconforming product. And crankshaft oil plug for crankshaft dynamic balancing without the influence of the experimental data, this paper is completed in the assembly of the crankshaft oil plug and not assembled oil plug state of dynamic balance, provide data support for crankshaft process optimization. Key words: crankshaft, Oil plug; Summary of dynamic balance is 0 because 16 v280 crankshaft design has a lot of oil, and the oil seal require filling wall. Caused by the process of the existence of oil plug, the existing technological process of cleaning process of crankshaft repeat and storage time is too long hole caused by corrosion, and so on and so forth. To optimize the process flow is from the crankshaft dynamic balancing process. So for crankshaft oil plug in the assembly is not assembled under the two states of dynamic balance study is very necessary. 1 dynamic balance principle of rotating workpiece unbalanced centrifugal force acting on rotor bearing will cause vibration, noise and accelerate the bearing wear, seriously affect the product performance and service life. Crankshaft in the manufacturing process should be based on the dynamic balance can smooth and normal operation, if the crankshaft dynamic balance amount is too large, will cause severe vibration of the engine, affects the fatigue life of the crankshaft and related functions. Typically, the balance of the rotor including unbalance measurement and correction of two steps, balancing machine is mainly used for measuring unbalance, and the amount of unbalance correction is often with the aid of drilling machine, milling machine, electric welding machine and other auxiliary equipment. 2 question 2 is put forward. 1 the original process flow of the existing technological process is: crankshaft machining & rarr; Oil duct cleaning & rarr; Assembly oil wall and balance weight & rarr; Dynamic balance & rarr; Check & rarr; Assembly workshop assembly, diesel engine total assembly workshop of crankshaft appearance before cleaning. If this process: one is the crankshaft oil storage for a long time, may be corroded, and the assembly has been shipped before have been unable to wash to the plugging of oil, difficult to ensure cleanliness requirements; The second is the crankshaft second repeat cleaning, affect the cost of manpower and increase production. 2. Two test methods to choose at least two root of crankshaft oil duct wall before and after dynamic balance test, compare the size of the unbalance, if within the prescribed scope, can optimize the crankshaft of the existing production process. Premise is to validate the crankshaft mounted wall before and after the change of the amount of unbalance after the crankshaft dynamic balance. If the little change of unbalance ( Within the scope of the permit) , can be in machining of crankshaft dynamic balancing and inspection qualified after tu rust-proof oil, send diesel engine crankshaft assembly workshop, when diesel engine always before the assembly by the assembly workshop of crankshaft oil duct and appearance after cleaning and plugging assembly at a time. 2. Overview of 1 3 test process. Root in good condition, select 2 inspection qualified 16 v280 crankshaft, ensure the oil hole and crankshaft body surface after cleaning without impurities, lest affect dynamic balancing effect. 2. In order to guarantee the data accuracy of dynamic balance, dynamic balance machine with standard shaft into the first self correcting, to verify that the state of dynamic balance machine is normal. 3. Will not to install the main oil hole and crankshaft oblique oil hole wall, according to the requirements of process documents after assembly counterweight to wipe clean surface of shaft neck experiment, dynamic balancing and data at the same time, record the result of the experiment. 4. Will be equipped with straight oil hole and crankshaft oblique oil hole wall, again to do dynamic balance experiment, record the result of the experiment and data. 2. 4 test result analysis of two crankshaft dynamic balancing experiments, table 1 and table 2 for the experimental process containing dynamic balance contrast before and after data. Table 1 and table 2 two tables data summary after the comparative analysis shows that two crankshaft before shipped without plugging do dynamic balance to qualified after heavy again after balance ( Both ends of the crankshaft unbalance the sum is less than 80 g) within the required range 。 And then stuck to do dynamic balance on both ends of the crankshaft unbalance is about 140 g, is beyond the requirements, the sum of that outfit after blocking of crankshaft dynamic balancing unbalance will impact. After test analysis of the cause of the crankshaft dynamic balancing unbalance get bigger, about the following: 1. Crankshaft oblique oil hole wall is composed of pressing sleeve and screwed plug, oblique oil hole in the processing requirements are & phi; 48 ~φ; Within the scope of the size of 52 mm, the size of the processed basically in & phi; Individual more than 50 mm, & phi; 50 mm, while the pressure is set according to the inclined oil hole size deserve to be alone, so that it can not guarantee all the pressing sleeve size are exactly the same or small difference, in the lateral and oblique oil hole position, dynamic balance radius is big, big influence on dynamic balance. 2. Oblique oil hole when processing the request and the pressing sleeve is 55 mm, mating surface depth and practical in machining process, some grow 1 - hole depth About 2 mm, when pressing set by manual pressure, there is no guarantee that every pressing sleeve being connected to the same depth, and 16 pressing sleeve is likely to have change, relative to the crankshaft, Total weight about 2500 kg) It is difficult to guarantee the unbalance of 80 g, is also difficult to control. Three conclusions by the experiments of 16 v280 crankshaft dynamic balance quantity changes before and after the install wall with first-hand data, can the crankshaft to clean after the plugging process craftwork process adjustment provides a theoretical basis and data support. Proved that dynamic balance first, then filling blocking the process flow of temporary is not feasible, to continue to optimize. But, we have a new understanding of crankshaft dynamic balance, the more understanding of the factors influencing the dynamic balance of crankshaft, accumulated valuable data, provides data for process optimization and improvement of the follow-up support. Source: 'science and wealth'