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Common problems of CNC deep hole processing

  • Author:kerry
  • Release on:2022-01-07

The problems that are easy to appear in the process of CNC machining of deep holes need to be vigilant, and the production and processing are required to be carefully compared with the drawings, and they are qualified within reasonable parameter values. Deep hole processing is prone to the following problems:
1. The aperture is enlarged and the error is large
The design value of the outer diameter of the reamer is too large or the cutting edge of the reaming has burrs; the cutting speed is too high; the feed rate is improper or the machining allowance is too large; the main deflection angle of the reamer is too large; the reamer is bent; Attached swarf tumor;
2. The aperture is reduced
The design value of the outer diameter of the reamer is too small; the cutting speed is too low; the feed rate is too large; the main deflection angle of the reamer is too small; the cutting fluid is not suitable; Reducing: When reaming steel parts, the margin is too large or the reamer is not sharp, which is easy to produce elastic recovery, so that the hole diameter is reduced and the inner hole is not round, and the hole diameter is unqualified.
3. The reamed inner hole is not round
The reamer is too long and the rigidity is insufficient, and vibration occurs during reaming; the main deflection angle of the reamer is too small; the cutting edge band of the reaming is narrow; the reaming allowance is not the same; The spindle bearing is loose, there is no guide sleeve, or the clearance between the reamer and the guide sleeve is too large, or the thin-walled workpiece is clamped too tightly, and the workpiece is deformed after removal.

the solution:
1. Appropriately reduce the outer diameter of the reamer according to the specific situation; reduce the cutting speed; appropriately adjust the feed rate or reduce the machining allowance; appropriately reduce the entering angle; straighten or scrap the bent unusable reamer; use oilstone carefully Trim to the standard; control the swing error within the allowable range; choose a cutting fluid with better cooling performance; before installing the reamer, clean the oil on the taper shank of the reamer and the taper hole of the machine tool spindle, and repair the bumps on the taper surface with oil stone Light; grind the flat tail of the reamer; adjust or replace the spindle bearing; re-adjust the floating chuck and adjust the coaxiality; pay attention to correct operation.
2. Change the outer diameter of the reamer; appropriately increase the cutting speed; appropriately reduce the feed rate; appropriately increase the entering angle; select oily cutting fluid with good lubrication performance; exchange reamer regularly and sharpen the cutting part of the reamer correctly; When designing the size of the reamer, the above factors should be considered, or the value should be selected according to the actual situation; for experimental cutting, take an appropriate margin and sharpen the reamer.
3. Reamers with unequal pitch can be used for reamers with insufficient rigidity. The installation of the reamer should be rigidly connected to increase the entering angle; use qualified reamer to control the hole position tolerance of the pre-processing process; use unequal Pitch reamer adopts longer and more precise guide sleeve; select qualified blanks; when using equal pitch reamer to ream more precise holes, the clearance of the machine spindle should be adjusted, and the matching gap of the guide sleeve should be required to be higher or Use proper clamping method to reduce clamping force.

As a modern manufacturer of precision mechanical parts, xy-global takes die-casting and CNC processing as its core processes, has physical factories, testing equipment, and integrates supporting manufacturing resources such as rapid prototyping, molds, and post-processing to provide customers with rapid proofing, Small and medium-sized batch production and trial assembly, truly a one-stop service that saves effort and effort; the company has Taiwan imported computer gongs, milling machines, lathes, grinders and other precision machining equipment, as well as a technical team with non-standard production experience.