Optimization Analysis of the Configuration Technology of a Cylinder Head Bolt

For long bolts with acceptable strength, the assembly torque used at that time may lengthen or even twist the bolts in the case of the torque coefficient distribution measured by the test. Due to the manual application of torque, the assembler will stop tightening when the bolt torque reaches its maximum and no longer increases, so that no twisting occurs. Manual torque angle method tightening process, process parameter estimation Because there is no torque/corner tightening machine at that time, try to use manual torque angle method to tighten, that is, first use a fixed torque wrench to tighten the bolt to a certain starting torque, and then use a wrench to turn the bolt An angle. According to the preliminary test at the assembly site, the angle A of the assembler to pull the wrench every time is about 80. If the bolt is tightened near the yielding zone, the average starting torque To of the bolt is: To=Tr-(A-10 R' = 166-70x0.88 = 104 Nm. Field test In order to measure the effect of manual torque angle tightening, the artificial torque angle method is initially set to loNm to about 80, the angle of the wrench, the final torque of the bolt, the elongation after assembly and the axial force. The test was carried out. The specific tightening process was as follows: first tighten the bolts with a fixed torque wrench with a value of 100 Nm, and then pull the bolts once with a high torque wrench (about 80). The torque and angle were measured by a BoschTAM200 Torque Angle Tester. The bolt elongation and axial preload were measured by a Raymondro 34 Bolt Length Gauge. It can be seen from the test results that the average torque of the artificial torque angle method - 10N.m to 80 or so after tightening the bolt is slightly larger than the average yield torque (16N.m), and the average axial force is slightly larger than the minimum yield axial force (76.2kN); The average axial force of the bolt after tightening is smaller than the manual torque angle method, but the standard deviation is large. The measured range of manual control angle is 69-890, and the statistical result is 80±15. In order to facilitate the positioning of the fitter's work habits, the corner is set at 750 士150. Taking into account the large deviation of the manual control angle, in order to avoid the elongation of the bolt, the average starting torque is reduced to 90Nm, and the starting torque is set to 90 ± 10Nm according to the precision of the fixed torque wrench. EQ6102 cylinder head bolt elongation analysis and assembly process improvement fixed torque wrench. The above analysis shows that the artificial torque cornering process from 0N.m to 75°150 in 90 can ensure the axial force required for the engine to seal and ensure that the bolt is not elongated or broken.

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