Reaming top ten problems and top ten solutions, too valuable!

In the reaming process, there are often many problems such as poor hole diameter and high surface roughness of the inner hole. Here is a summary of the top ten reaming problems and solutions!

Causes of the problem

Increased hole diameter and large errors
Reamer outside diameter size design value is large or reamer edge burr; cutting speed is too high; improper feed or machining allowance is too large; reamer main offset angle is too large; reamer bending; reamer edge with chip tumor adhering; reamer edge swing during sharpening is super poor; cutting fluid selection is not appropriate; installation of reamer tapered shank surface oil is not wiped clean or tapered surface has bump injury; tapered shank flat tail offset into the machine tool spindle after the tapered shank cone interference. The spindle is bent or the spindle bearing is too loose or damaged; the reamer floats inflexibly; it does not have the same axis as the workpiece; the reamer shakes from side to side due to uneven force of both hands when reaming by hand.

Hole diameter reduction
Reamer outer diameter size design value is small; cutting speed is too low; feed is too large; reamer main deviation angle is too small; cutting fluid selection is not appropriate; sharpening reamer wear part is not worn out, elastic recovery to reduce the hole diameter; reaming steel parts, the margin is too large or reamer is not sharp, easy to produce elastic recovery to reduce the hole diameter; inner hole is not round, hole diameter is not qualified.

The reamed bore is not round
The reamer is too long and not rigid enough to produce vibration when reaming; the main offset angle of the reamer is too small; the reamer edge band is narrow; the reaming allowance is partial; there are gaps and cross holes on the inner hole surface; there are sand holes and air holes on the hole surface; the spindle bearing is loose and there is no guide sleeve, or the clearance between the reamer and the guide sleeve is too large; the workpiece is deformed after unloading because the thin-walled workpiece is clamped too tightly.

The inner surface of the hole has obvious angular surface
Excessive reaming allowance; excessive rear angle of the cutting part of the reamer; excessively wide reamer edge band; air holes and sand eyes on the surface of the workpiece; excessive spindle swing.

High surface roughness value of the inner hole
Excessive cutting speed; inappropriate cutting fluid selection; reamer main offset angle is too large, reamer edge is not on the same circumference; reaming allowance is too large; reaming allowance is uneven or too small, local surface is not reamed; reamer cutting part swing is too poor, the edge is not sharp, the surface is rough; reamer edge band is too wide; poor chip removal during reaming; excessive reamer wear; reamer bruising, burr or chipping on the edge; chip tumor on the edge; due to Due to the material, the reamer is not suitable for zero degree front angle or negative front angle reamer.

Low reamer life
Unsuitable reamer material; reamer burns during sharpening; unsuitable choice of cutting fluid, cutting fluid does not flow smoothly at the cutting place; too high surface roughness value after reamer sharpening

Reamed hole position accuracy is too poor
Wear of the guide sleeve; the bottom end of the guide sleeve is too far from the workpiece; the length of the guide sleeve is short and the precision is poor; the spindle bearing is loose.

Reamer teeth chipping
Reaming allowance is too large; workpiece material hardness is too high; cutting edge swing is too large, cutting load is not uniform; reamer main deviation angle is too small, so that the cutting width increases; reaming deep holes or blind holes, too many chips, and not in time to remove; sharpening when the teeth have been worn crack.

Reamer shank breakage
The reaming allowance is too large; when reaming a tapered hole, the coarse and fine reaming allowance distribution and cutting amount are not properly selected; the chip space of the reamer teeth is small and the chips are blocked.

The centerline of the hole is not straight after reaming
Reaming before the hole is skewed, especially when the hole diameter is small, due to poor reamer rigidity, can not correct the original curvature; reamer main deflection angle is too large; poor guidance, so that the reamer in reaming easy to deviate from the direction; cutting part of the inverted cone is too large; reamer in the middle of the interrupted hole gap displacement; hand reaming, in a direction of excessive force, forcing the reamer to one end of the deflection, destroying the verticality of the reamed hole.

Solution measures

Increased hole diameter and large error
According to the specific situation to properly reduce the reamer outside diameter; reduce the cutting speed; properly adjust the feed or reduce the machining allowance; properly reduce the main deflection angle; straighten or scrap the bent reamer can not be used; carefully trimmed with oil stone to qualified; control the swing difference in the allowable range; choose a better cooling performance of the cutting fluid; reamer must be installed before the reamer taper shank and machine tool spindle taper hole internal oil wipe clean, the taper surface has a bump with oil Before installing the reamer, clean the oil from the reamer taper shank and the taper hole of the machine tool.

Hole diameter reduction
Replace the reamer outer diameter size; appropriately increase the cutting speed; appropriately reduce the feed amount; appropriately increase the main offset angle; choose an oil-based cutting fluid with good lubrication performance; regularly interchange reamers and properly sharpen the cutting part of the reamer; when designing the reamer size, consider the above factors or take the value according to the actual situation; make experimental cutting, take the appropriate margin and sharpen the reamer.

Reamed bore is not round
rigid reamer can be used unequal pitch reamer, reamer installation should be rigid coupling, increase the main offset angle; use qualified reamer, control the hole position tolerance of the pre-processing process; use unequal pitch reamer, use a longer, more precise guide sleeve; use qualified blank; use equal pitch reamer reaming more precise hole, the machine tool spindle clearance should be adjusted, the guide sleeve should require a higher fit clearance The clamping force should be reduced by using the appropriate clamping method.

The inner surface of the hole has obvious angular surface
Reduce the reaming allowance; reduce the back angle of the cutting part; resharpen the width of the edge band; select a qualified blank; adjust the machine tool spindle.

High value of surface roughness of the inner hole
Reduce the cutting speed; select the cutting fluid according to the processed material; reduce the main deviation angle appropriately and sharpen the reamer edge correctly; reduce the reaming allowance appropriately; improve the accuracy and quality of the bottom hole position before reaming or increase the reaming allowance; select a qualified reamer; resharpen the width of the cutting edge; reduce the number of reamer teeth according to the specific situation, increase the space of the chip tank or use a reamer with an edge inclination angle to make chip removal smoothly; replace the reamer regularly and grind away the grinding area when sharpening. The reamer should be sharpened, used and transported to take protective measures to avoid bruising; for reamers that have been bruised, the bruised reamer should be repaired with a special fine oil stone or replaced; the reamer should be trimmed with an oil stone until it is qualified and a reamer with a front angle of 5° to 10° should be used.

Reamers with low service life
Select reamer material according to the processing material, carbide reamer or coated reamer can be used; strictly control the cutting amount of sharpening to avoid burns; often choose the correct cutting fluid according to the processing material; often remove the chips in the chip groove, use sufficient pressure cutting fluid, after fine grinding or grinding to meet the requirements.

Reamed out hole position accuracy exceeds poor
Regularly replace the guide sleeve; lengthen the guide sleeve to improve the accuracy of the fit between the guide sleeve and the reamer gap; promptly repair the machine tool and adjust the spindle bearing clearance.

Reamer teeth chipping
Modify the size of the pre-processed hole; reduce the hardness of the material or change to a negative front angle reamer or carbide reamer; control the swing difference within the qualified range; increase the main offset angle; pay attention to timely chip removal or use a reamer with edge inclination; pay attention to the quality of sharpening.

Reamer shank breakage
Modify the pre-processed hole size; modify the allowance distribution and choose the cutting amount reasonably; reduce the number of reamer teeth, increase the chip space or grind off one tooth from the gap of the tool teeth.

The centerline of the hole after reaming is not straight
Increase the reaming or boring process to correct the hole; reduce the main deviation angle; adjust the appropriate reamer; change the reamer with guided part or longer cutting part; pay attention to the correct operation.