Analysis and improvement of the radial runout of the reverse gear gear hobbing

The Jetta reverse gear is produced at the Chongqing Machine Tool Plant with a difference of 0.014mm. After the cumulative tolerance of the weekly section is 0. The liquid level is closed, the valve is closed and the impregnation tank is inflated, so that the pressure reaches the opening of the valve infiltration agent and returns to the storage glue. The tank is to the specified liquid level; the inspection parts are all visually inspected, and the 5% mass to 10% is used to check the leakage rate of the workpiece with a helium mass spectrometer (the detection standard is 106 Pa.m3/s). The impregnation all meets the standard requirements.
Precautions 6.1 The vacuum, pressurization pressure and dwell time of the impregnation tank must be ensured during the infiltration production.
6.2 Maintenance of infiltration agent a. Check the viscosity and stability of the infiltration agent once a week, and continue to produce within the specified index; the infiltration agent cannot be used in an oxygen-rich or pure oxygen system; the infiltration agent cannot It is used to seal Cl2 or strong oxidizing medium; the infiltrant is contraindicated by copper ions; the infiltrant is forbidden to carry oil. If a small amount of oil enters the glue, if the indicators of the glue are within the specified range, they can still be used; if the amount of oil with the glue is accumulated so that the indicators are out of the specified range, the glue is scrapped; Water and electrolytes should be avoided in human rubber; if metal powder and metal scrap are used, they should be cleaned regularly; the workpiece must be cleaned before impregnation.
6.3 curing considers the heat transfer speed of the heated parts. The effective curing time should be no less than 20min from the temperature of the entire part. The curing water should be ion exchanged water and adjusted to a pH of 5 ~ 7 with glacial acetic acid. black. According to the amount of production, the curing solution should be replaced every 1~2 shifts.
(Responsible editor Li Xiang) The manuscript was received on December 9, 1999.
In January 1999, the radial runout tolerance of the reverse gear ring gear and the accumulated tolerance of the weekly joint were unstable, and the individual tolerances reached 0.02 mm. After nearly half a month of analysis and adjustment, the quality problem was solved. . The reasons for the problem, the process of the solution and the method of improvement are described.
Cutting Technology Requirements 2 Cutting Gear Clamping As shown in the figure, adjust the center of the complete fixture to coincide with the center of rotation of the table, and fasten it to the table with T-screws. In order to strengthen the rigidity, the top of the mandrel is supported by a tip. The reverse gear is centered on the pull rod at /19mm, and the pull rod is guided by the guide seat hole. The large end face of the gear is supported on the guide seat, and the pull rod is pressed against the gear through the clamp seat.
The main inspection items and improvement measures for the solution of the ring gear radial runout are listed in Table 1.
Analysis and improvement of the cause of the radial runout of the ring gear a. There are many factors affecting the radial runout of the ring gear. The main cause of the overrun is the wear of the two centering diameters (D19mm and D22mm) of the tie rod, resulting in the drawbar Tightening at different positions, the radial runout of the cut gear ring is unstable, and the individual is out of tolerance.
Table 1 Inspection items and improvement measures Check item status improvement measures Pull rod radial runout mm centering diameter wear; guide seat and table different axis mm journal, make the fit clearance <0.01mm; adjust the base so that the guide seat is full radial 1 moving tolerance <0. hole and tie rod clearance mm positioning diameter wear to 18.96rnm, gap increase to replace the new tie rod, control gear D19mm hole size, so that the fit clearance <0. clamping cover force end face full jump clamping seat Clamping at different angles, the radial runout of the tie rod re-grinds the end face of the clamping seat, improving the precision of the pull rod. The end face of the force end is fully jumped. The top end and the coaxiality of the worktable are close to the tie rod and do not resist the radial runout of the pull rod. (Describe the better coaxiality) Reverse gear small end face full jump individual parts end face full jump perfect process, control small end face full runout tolerance <0. Workbench worm gear clearance adjustment thickening worm, reduce clearance b. The reverse gear is pressed by the end face of the tie rod clamping seat, there is no floating link, and the tie rod is slender, so the contact surfaces required to bear the force are parallel and perpendicular to the axis of the table. For example, the end face of the clamping seat, the small end face of the gear, and the end face of the guiding seat should have higher requirements, and the higher the distance from the gear bearing end face, the more obvious the deformation of the tie rod is affected, and the requirement should be higher. Therefore, the full runout tolerance of the end face of the clamping seat is required. 5mm, gear small end face full runout tolerance <0.025mm. Under the tension, the change of each contact surface causes the tie rod to deform as shown.
Automobile technology Jinbei light brake engine repair and adjustment Dagang Oilfield Group Automotive Technology Service Center Zhou Xigang 5L and other series of models, the main engines used are CA488, 491Q (4Y), 492Q, SY492Q, 1RZ and 2RZ models. The common maintenance and adjustment data for the main engine models are introduced. TopicWords: Lightbus, Engine, Service Keywords: Light passenger car engine repair 4Y engine manufacturing technology to produce new models, reaching the international advanced level in the 1980s, is the most common one of the Jinbei light passenger car optional domestic engine.
5 models.
The original engine used in the new Haice light passenger car is the most common in the Jinbei sea lion light passenger car newly introduced by FAW Jinbei Automobile Company.
2 Maintenance and adjustment data for various engines Table 1 lists the maintenance and adjustment data for various engines.
At present, the appearance of the SY6474 and SY6475, which have been put on the market, is almost the same, but the actual engine models are not the same, so that the engines of various models are easily confused during maintenance. In order to facilitate the reasonable use, correct maintenance and repair of the Jinbei light passenger car, the common maintenance and adjustment data of the main model engines used in the Jinbei light passenger car are compiled and compiled for the majority of users.
The engines used in the Jinbei light passenger car mainly include the characteristics of CA488 and 1 various engines. a. CA488 gasoline engine is the engine manufacturing technology introduced by Chrysler Corporation of the United States. It adopts a variety of advanced structure models and is a light cargo (customer) of FAW Group. One of the important power models for cars and cars.
Quantity, the rod centering diameter mm is changed to 019:8 >19+r21mm inner hole size quality control in 019 a series of improvements and fixture adjustment, eliminating the fluctuation of the radial runout instability of the reverse gear ring gear, improved The quality after cutting the teeth.
(Responsible editor Li Xiang) The radial runout of the ring gear directly affects the tolerance of the gear circumference, while the tolerance of the circumference has little effect on the radial runout of the ring gear. With the solution of the radial runout of the ring gear, the tolerance of the circumference is also solved. The worm gear clearance of the table has an influence on the tolerance of the circumference, and has little effect on the radial runout of the ring gear.
The inner hole size of the reverse gear is 019. The original fitting size is D19: g8mm, and the maximum matching clearance is 0.041mm. The maximum radial runout tolerance of the tie rod is 0. 082mm. The overlap effect of the tie rod in the guide seat clearance is greater than the cutting rear diameter. To the beating tolerance.
063mm; therefore, according to the original figure, the inner rod of the pull rod and the reverse gear can be manufactured. If the size is not controlled, the radial runout error may occur. In order to improve the positioning accuracy of the inner hole of the reverse gear, improve the cutting quality

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