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Accuracy error adjustment of reducer and other transmission equipment
Hits:470         Date:2020-07-28
The adjustment of transmission equipment such as reducer mainly lies in the selection of suitable matching methods between parts to make the equipment have reasonable working accuracy and normal working functions.
From a general point of view, the adjustment of mechanical equipment cannot be carried out only after the parts are assembled. It is necessary to consider the handling of this problem when analyzing equipment failures and determining the repair of related parts.
Accuracy of transmission equipment such as reducer: Mainly manifested as the rotation accuracy of the spindle, the guiding accuracy of the guide rail and the transmission accuracy of the transmission chain.
The error source of equipment accuracy of worm gear reducer
1. The main error source of the rotation accuracy of the reducer spindle
Spindle rotation accuracy refers to the radial runout, end face circular runout and axial runout of the front end of the spindle. The main error sources of the spindle rotation accuracy are as follows.
The machining error of the spindle:
(1) There is a coaxiality error between the two journals on the main shaft.
(2) The conical hole of the spindle has a coaxiality error relative to the journal.
(3) The journal has roundness errors.
(4) There is a perpendicularity error between the axial positioning surface of the bearing and the spindle axis.
Bearing machining error:
(1) Sliding bearings have internal and external roundness errors and coaxiality errors; there are coaxiality errors between the front and rear bearings; there are dimensional errors between the bearing hole and the journal.
(2) There are dimensional errors and roundness errors between the rolling elements of rolling bearings; the inner circular hole is eccentric relative to the raceway; the inner circular raceway has roundness errors; there is a coaxiality error between the front and rear bearings.
Machining error and assembly quality of matching parts:
(1) The bearing hole on the gear reducer case body has roundness error; there is a size error when it is matched with the bearing ring; there is a perpendicularity error between the axial positioning end face and the center axis of the hole.
(2) The nut for locking and adjusting the bearing gap on the reducer main shaft has an end face flatness error; there is a perpendicularity error between the nut end face and the thread center axis; there is a connection error between the threads.
(3) There is a parallelism error on both ends of the bearing bush spacer.
(4) During assembly, whether the bearing clearance adjustment is appropriate will directly affect the spindle rotation accuracy.
2. The main error source of the transmission accuracy of the reducer transmission chain
Transmission accuracy refers to the degree of influence of the accuracy of each link in the transmission chain on the accuracy and uniformity of the movement of the terminal actuator.
The transmission chain in general mechanical equipment is composed of gears and gears, gears and racks, worm gears and worms, lead screws and nuts. In the entire transmission chain, the transmission error is transmitted from the power input link to the terminal actuator, and is accumulated according to the transmission ratio. The transmission accuracy of the transmission chain has a significant effect on the machining error of the thread processing on the lathe and the gear hobbing machine.
In the process of equipment maintenance, the common error sources of transmission accuracy are:
(1) The error of the transmission parts has a major influence on the transmission accuracy of the equipment.
(2) The error of the matching parts and the assembly quality have a significant impact on the transmission accuracy.
(3) During work, the transmission parts will inevitably cause deformation due to heat and force, which will also have a certain impact on the transmission accuracy of the transmission chain.
3. The main source of error in guide rail accuracy
The guiding accuracy of the guide rail refers to the accuracy of the movement track formed when the moving parts of the mechanical equipment move along the guide rail. In addition to the type, combination and size of the guide rail selected in the design, the main factors that affect the accuracy of the guide rail guidance are:
(1) Affected by the geometric accuracy of the guide rail.
(2) Affected by the proper clearance of the guide rail.
(3) Affected by the rigidity of the guide rail.
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