Views: 0 Author: Site Editor Publish Time: 2022-06-20 Origin: Site
Ø aracy of the aperture
Ø Boring process pay attention to keep cooling fully, increase the lubrication effect of machining parts to reduce the cutting force
Ø Chip removal is strictly carried out in each machining step to prevent chip participation in secondary cutting from affecting aperture machining accuracy and surface quality
Ø Boring process at any time check the tool (blade) wear degree, timely replacement to ensure the quality of aperture processing; The process of fine boring is strictly prohibited to replace the blade to prevent errors; After each step of processing must strictly implement the process quality control requirements, carefully detect the actual processing aperture and make a good record, easy to analyze, adjust and perfect boring processing
1. Boring machining main problems
1） Tool wear
In boring machining, continuous cutting tool, easy to appear wear and damage phenomenon, reduce the dimensional precision of hole machining, so that the surface roughness value increases; At the same time, the calibration of fine-tuning feed unit is abnormal, which leads to adjustment error and machining aperture deviation and even product quality failure.
P1：Blade wear changes
2） The machining error
The machining error of boring is reflected in the change of size, shape and surface quality of the hole after machining. The main influencing factors are as follows:
（1）The length to diameter ratio of the cutter rod is too large or the overhang is too long;
（2） The blade material does not match the workpiece material;
（3） the amount of boring is unreasonable;
（4）Unreasonable allocation of allowance adjustment;
（5） The offset of the initial hole leads to periodic change of allowance;
（6）the workpiece material is high rigidity or low plasticity, the tool or material is let the knife trend.
3）The surface quality
Boring has been processed surface fish scale or thread cut, is the more common surface quality phenomenon:
Mainly because of the tool feed and speed mismatch
Mainly due to boring machining rigid vibration and tool wear
4）Adjust the mistakes
In boring machining, due to the need for operators to adjust the amount of tool distribution layer, in the process of adjustment and distribution of feed margin due to improper operation is easy to cause machining dimensional accuracy deviation.
Improper use of measuring tools and wrong measuring methods in the process of boring and post-processing are common quality hazards in boring.
（1） Measurement tool error;
（2） Incorrect measurement method.
2. Influence factors of inner hole turning and processing optimization measures
The inner hole turning is also called boring, which is used to enlarge the inner hole of the workpiece or process the inner surface of the hollow workpiece by turning method. It can be processed by most of the outer circle turning process methods. In cylindrical turning, the length of the workpiece and the size of the tool bar selected do not affect the tool overhang, so it can withstand the cutting force generated during machining. Boring and hole turning, hole depth determines the suspension, therefore, the aperture and length of the parts of the tool selection has a great limit, so we must integrate the factors to optimize the processing scheme.
3. General rules for machining inner holes
1） minimize the tool overhang and choose the tool size as large as possible, in order to obtain the highest processing accuracy and stability.
2）Due to the space limitation of the aperture of machining parts, the choice of tool size will also be limited, and the chip removal and radial movement must be taken into account when machining.
3） In order to ensure the stability of the inner hole processing, the correct inner hole turning tool should be selected and correctly applied and clamped to reduce the tool deformation and minimize the vibration to ensure the processing quality of the inner hole.
In the inner hole cutting cutting force is also an important factor to be reckoned with, for a given inner hole cutting conditions (shape, size, way of clamping workpiece, etc.), the size and direction of the cutting force is inhibition of inner hole cutting vibration, improve the quality of machining, the important factors when cutting tool in cutting, tangential and radial cutting force cutting force make the tool produces deflection phenomenon, Slowly moving the tool away from the workpiece causes the cutting force to deflect. The tangential force will attempt to force down the tool and move it away from the centerline, reducing the tool's back Angle. When the diameter of the turning hole is small, the back Angle should be large enough to avoid interference between the tool and the hole wall.
During machining, radial and tangential cutting forces lead to deflection of the inner hole tool, which usually requires mandatory cutting edge compensation and tool vibration protection. When radial deviation occurs, the cutting depth and chip thickness should be reduced.