(1) Causes

The design value of reamer's outer diameter is too large or the cutting edge of reamer has burrs; cutting speed is too high; feed quantity is inappropriate or machining allowance is too large; the main deviation angle of reamer is too large; reamer bends; chips are adhered to the reamer edge; cutting edge sway is too bad when grinding; cutting fluid selection is inappropriate; oil stain on the surface of the cone shank is not cleaned or there is bump on the cone surface when reamer is installed; flat of the cone shank Conical interference of taper shank after tail offset loading into machine tool spindle; bending of spindle or loose or damaged bearing of spindle; inflexible floating of reamer; uneven force exerted by both hands when different axes and reaming holes of workpiece make reamer sway left and right.

(2) Solutions

Reduce the reamer's outer diameter appropriately according to the specific conditions; reduce cutting speed; adjust feed or reduce machining allowance appropriately; reduce the main deflection angle appropriately; straighten or scrap the unusable reamer that bends; carefully dress it up to the qualified level with oilstone; control the swing error within the allowable range; select the cutting fluid with better cooling performance; before installing reamer, the reamer's taper shank and the machine tool's spindle taper hole must be inside. Oil stain is wiped off, oil stone is used to polish the conical surface where there is bump; flat tail of reamer is polished; spindle bearing is adjusted or replaced; floating chuck is adjusted and coaxiality is adjusted; proper operation is paid attention to.

(1) Causes

The design value of reamer outer diameter size is small; cutting speed is too low; feed is too large; main deviation angle of reamer is too small; cutting fluid selection is not appropriate; the wear part of reamer is not worn off during grinding, and the elastic recovery reduces the aperture; when reaming steel parts, the surplus is too large or the reamer is not sharp, it is easy to produce elastic recovery, which reduces the aperture and the inner hole is not round and the aperture is not qualified.

(2) Solutions

Change reamer outer diameter size; properly increase cutting speed; properly reduce feed; properly increase main deviation angle; select oil cutting fluid with good lubrication performance; regularly exchange reamers and grind reamer cutting parts correctly; when designing reamer size, the above factors should be taken into account, or the actual value should be taken according to the actual situation; for experimental cutting, appropriate allowance should be taken to sharpen reamer.

(1) Causes

Reamer is too long, rigid enough, vibration occurs when reaming; reamer main deflection angle is too small; reamer cutting edge band is narrow; reamer allowance is too large; there are notches and crossholes on the surface of inner hole; there are sand holes and air holes on the surface of the hole; spindle bearing is loose, there is no guide sleeve, or the clearance between reamer and guide sleeve is too large, and the workpiece deforms after unloading due to the clamping of thin-walled workpiece.

(2) Solutions

Reamers with insufficient rigidity can adopt reamers with unequal pitch, and the installation of reamers should adopt rigid connection to increase the main deviation angle; qualified reamers should be selected to control the tolerance of hole position in the pre-processing process; unequal pitch reamers should be adopted to adopt longer and more precise guide sleeves; qualified blanks should be selected; when reamers with equal pitch are used to ream more precise holes, the clearance of machine tool spindle should be adjusted. The mating clearance of the guide sleeve should be higher or appropriate clamping method should be adopted to reduce the clamping force.

(1) Causes

Excessive reaming allowance, too large reamer cutting back angle, too wide reaming edge band, too large air hole, sand hole and spindle swing difference on workpiece surface.

(2) Solutions

Reduce reaming allowance; reduce the back angle of cutting part; grinding edge width; select qualified blanks; adjust machine tool spindle.

(1) Causes

Excessive cutting speed; inappropriate choice of cutting fluid; too large main deviation angle of reamer, reamer cutting edge is not on the same circumference; too large reamer allowance; reamer allowance is uneven or too small, local surface is not reamed; reamer cutting part swing error, edge is not sharp, surface rough; reamer cutting edge band is too wide; reamer chip removal is not smooth; reamer excessive wear; reamer collision, edge retention There are burrs or breaks; there are chip tumors on the edge; due to material relations, it is not suitable for reamers with zero or negative front angles.

(2) Solutions

Reduce cutting speed; Choose cutting fluid according to processing material; Appropriately reduce the main deviation angle and sharpen the cutting edge correctly; Appropriately reduce the reaming allowance; Improve the accuracy and quality of reaming front and bottom hole or increase reaming allowance; Select qualified reamer; Grind blade width; Reduce the number of reamer teeth according to specific circumstances, increase the space of chip groove or adopt reamer with inclination angle of edge to remove chips. Successful; regular replacement of reamers, grinding area when grinding; reamers in the grinding, use and transportation process, should take protective measures to avoid bruising; for the damaged reamers, the use of special fine tar will be bruised reamer repair, or replacement reamer; with tar to qualified, using front angle 5 - 10 reamer.

(1) Causes

Reamer material is not suitable; reamer burns in grinding; cutting fluid selection is not appropriate, cutting fluid can not flow smoothly, cutting location and surface roughness after reamer grinding are too high.

(2) Solutions

Carbide reamer or coated reamer can be used to select reamer materials according to processing materials; cutting parameters should be strictly controlled to avoid burns; cutting fluids should be selected correctly according to processing materials; chips in chip grooves should be removed frequently, and enough pressure cutting fluid should be used to meet the requirements after finishing or grinding.

(1) Causes

Wear of guide sleeve; too far from the workpiece at the bottom of guide sleeve; short length of guide sleeve, poor accuracy and loosening of spindle bearing.

(2) Solutions

Regular replacement of guide sleeve; lengthening guide sleeve to improve the matching accuracy between guide sleeve and reamer clearance; timely maintenance of machine tools, adjustment of spindle bearing clearance.

(1) Causes

Reaming hole allowance is too large; workpiece material hardness is too high; cutting edge swing difference is too large, cutting load is not uniform; reamer main deviation angle is too small, so that cutting width increases; reaming deep hole or blind hole, too much chips, and not timely clearance and grinding tool teeth have been grinded.

(2) Solutions

Modify the pre-processed aperture size; reduce material hardness or change to negative front angle reamer or carbide reamer; control the swing difference within the eligible range; increase the main deflection angle; pay attention to timely removal of chips or the use of inclined edge reamer; pay attention to grinding quality.

(1) Causes

Excessive reaming allowance, inappropriate distribution of rough and fine reaming allowance and selection of cutting parameters when reaming taper hole, small chip space of reamer teeth and chip blockage.

(2) Solutions

Modify the pre-machined aperture size, modify the allowance allocation, select the cutting parameters reasonably, reduce the number of reamer teeth, increase the chip space or grind the clearance of the cutter teeth.

(1) Causes

Drilling hole deviation before reaming hole, especially when the hole diameter is small, can not correct the original bending because of the poor rigidity of reamer; the main deviation angle of reamer is too large; the poor guidance makes reamer easily deviate from the direction in reaming; the chamfer of cutting part is too large; the reamer displaces at the gap in the middle of discontinuous hole; when reaming hole, too much force is exerted in one direction, forcing reamer to deviate to one end, which destroys the reamer. Verticality of reaming hole.

(2) Solutions

Increase the reaming or boring process correction hole; reduce the main deviation angle; adjust the appropriate reamer; replace the reamer with the guide part or lengthen the cutting part; pay attention to the correct operation.