The accuracy of the treatment of the bore is very high, and the dimensional precision of the fine bore can reach it8 ~ it7, and the diameter of the hole can be controlled in the accuracy of 0.01 mm. If it is very boring, the treatment accuracy can reach TT7-IT6 and the surface quality is good. For general drilling, the RA value of surface roughness is 1.6 ~ 0.8 μm. Let’s take a look at how the bore must be treated.
Boring steps and precautions
Installation of boring tools
It is very important to install the work part of the boredom tool, in particular for work adjustments that adopt the principle of eccentricity. . Installation on the same horizontal plane can ensure that several chip blades are at normal treatment and cutting angles.
Boring boring tool test
The encouragement tool is adjusted to reserve the allowance from 0.3 to 0.5 mm depending on the process manufacturing requirements, and the rugged bore margin The margin is respected.
Once the bore tool has been installed and borrowed, a test alcohol is necessary to check if the debugging of the boredom tool meets the boring requirements.
Boring
Before annoying, check carefully if the positioning reference of the tools, the part and each positioning element is stable and reliable.
What is the diameter of the initial hole to be treated with a caliper? What amount of reserved treatment allocation is calculated now?
Before the treatment of boredom, check whether the precision of repeated positioning and the dynamic precision of the balance of equipment (spindle) meet the processing and process manufacturing requirements.
During the horizontal drilling test process, the dynamic jump value of the overhang of gravity of the bore bar must be checked and the cutting parameters must be reasonably corrected to reduce the impact of the centrifugal shear vibration in the ‘machining.
The bore of the layer is reasonably allocated according to the stages of noisy boredom, semi-end boredom and fine boredom. Semi-end boredom that the result is a tool phenomenon which affects the accuracy of the adjustment of the precision bore allowance.
Difficult materials and high precision encouragement (tolerance ≤ 0.02 mm) can add fine bore treatment steps, and the boring margin is not less than 0.05 mm to avoid elastic tools on the machining surface.
During the process of alignment of the boredom tool, attention must be paid to avoid the impact of the workpiece of the boredom tool (insert and tool support) and the block of Assembly of the tool, damage to the groove of the blade and tool holder guide, causing the variation of the adjustment value of the boredom tool to modify and affect the accuracy of the hole machining.
During boredom, pay attention to the maintenance of sufficient cooling, increase the lubrication effect of the treatment part to reduce the cutting force.
Strict elimination of chips in each stage of treatment to prevent the participation of chips in secondary cut from affecting the precision of pore treatment and the quality of the surface.
During the boredom process, check the degree of wear of the tool (insert) at any time and replace it in time to ensure the quality of the hole diameter; Stage of treatment, the quality control requirements of the process must be strictly implemented and the opening of actual processing must be carefully tested and carried out.
Main boring treatment problems
Wear
During boring treatment, the tool is continuously, which is subject to wear and rupture, which reduces the dimensional precision of the treatment of holes and increases the value of surface roughness; Errors, causing differences in the diameter of the machining hole.
Changes in wear on the edge of the blade ▼
Processing error
The error in treatment for boring treatment is reflected in changes in size, shape and quality of surface after treatment of holes.
The length and diameter of the knife rod are too large or too extensive
The material with the blade does not correspond to the material of the part
Unreasonable boring dosage
Unreasonable attribution of the adjustment of the margin
The difference in the position of the initial hole causes periodic margin changes
Part materials have high rigidity or low plasticity, and the tool or the material tends to give the knife
Surface quality
The boredom of the fish scale or the wire -shaped cuts on the transformed surface is a phenomenon of common surface quality:
It is mainly caused by the lag in the supply of the tools and the rotation speed ▼
Mainly caused by rigid vibrations and boring tools wear
Adjustment errors
During the treatment of boredom, the operator must adjust the quantity of the distribution layer to be taken, and the dimensional treatment difference may occur due to inappropriate operation during the process of adjusting the ‘Distribution feeding allowance.
Measuring error
A misuse of measurement tools during and after bore and errors in measurement methods are common quality dangers in removal and treatment.
Tool measurement error
Incorrect measurement method
Analysis of typical boring quality of boring treatment problems ▼
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