There are many die holes, reaming holes common problems and their solutions, neat!
In the reaming process, there are often many problems such as poor hole diameter and high inner surface roughness. The following summarizes the ten major problems and solutions for reaming - 1. The aperture increases and the error is large Reamer outside diameter size design value is too large or the burr edge burr; cutting speed is too high; improper feed or machining allowance; reamer angle is too large; reamer bending; Reamer blade adhesion Swarf; sharpening of the reamer edge when the sharpening is exceeded; the cutting fluid is not suitable; the oil on the surface of the taper shank has not been wiped cleanly or the taper surface has been punctured when the reamer is installed; the taper shank is offset into the spindle of the machine tool Taper shank cone interference; spindle bending or spindle bearing too loose or damaged; reamer floating is not flexible; and different parts of the workpiece; hand reaming force uneven when the two hands, so that the reamer left and right shaking. solution: According to the specific circumstances, reduce the outer diameter of the reamer properly; reduce the cutting speed; properly adjust the feed or reduce the machining allowance; properly reduce the main angle; straighten or scrap the reamer that can't be used for bending; carefully trim the oilstone to Qualified; control of the swing within the allowable range; choose better cooling fluid; reamer must be before the installation of the reamer CNC cncdar taper shank and the taper of the machine spindle cone internal oil wipe, cone with a bump Polishing light with whetstone; grinding reamer flat tail; adjusting or replacing the spindle bearing; readjust the floating chuck head and adjust the coaxiality; note the correct operation. 2. Aperture reduction Reamer outside diameter size design value is too small; cutting speed is too low; feedrate is too large; reamer declination angle is too small; cutting fluid selection is not appropriate; sharpening wear part of the reamer is not worn, elastic recovery makes the aperture Shrinking; When the hinge steel, the excess is too large or the reamer is not sharp, easy to produce elastic recovery, so that the aperture is reduced; the hole is not round, the aperture is not qualified. solution: Replacing the outer diameter of the reamer; Appropriately increasing the cutting speed; Properly reducing the feed rate; Increasing the main declination angle properly; Selecting an oil-based cutting fluid with good lubricating properties; Interchanging the reamer regularly, correcting the cutting part of the reamer; Designing the joint When the size of the knife, the above factors should be considered, or value based on the actual situation; for experimental cutting, take the appropriate margin, the sharpening of the reamer. 3. The inner hole of the hinge is not round Reamer is too long, lack of rigidity, vibration occurs when reaming; reamer angle is too small; reamer blade is narrow; reaming margin is offset; notch, cross hole on the surface of the inner hole; hole on the surface of the hole, air hole; spindle The bearing is loose, there is no guide sleeve, or the gap between the reamer and the guide sleeve is too large; because the thin-walled workpiece is clamped too tightly, the workpiece is deformed after unloading. solution: The reamer with insufficient rigidity may use a reamer that is not equal in pitch; the installation of the reamer shall adopt a rigid connection to increase the primary declination angle; the qualified reamer shall be used to control the hole position tolerance of the pre-machining process; unequal pitch Reamers, using longer, more precise guide sleeves; select qualified blanks; when using equal-pitch reamers to ream more precise holes, the spindle clearance of the machine tool should be adjusted, and the matching clearance of the guide sleeves should be high; The clamping method reduces the clamping force. 4. The inner surface of the hole has obvious facets The reaming hole is too large; the reamer cutting part is too large; the reamer blade is too wide; the surface of the workpiece has air holes and trachoma; the spindle has a large swing. solution: Reducing the amount of reaming hole; reducing the back angle of the cutting part; trimming the width of the land area; selecting the qualified blank; adjusting the spindle of the machine tool. 5. Inner hole surface roughness value is high The cutting speed is too high; the cutting fluid is not suitable; the main yaw angle of the reamer is too large; the cutting edge of the reamer is not on the same circumference; the remaining amount of the reamer hole is too large; the remaining amount of the reamer hole is uneven or too small, and the local surface is not hinged; The reamer cutting part has poor oscillating differential, sharp edges, and rough surface; the reamer blade is too wide; the chipping is not smooth during reaming; the reamer is excessively worn; the reamer is nicked, leaving burrs or chipping at the edge; There are built-up edge on the cutting edge; due to material relationship, it is not suitable for reamer with zero or negative rake angle. solution: Reduce the cutting speed; select the cutting fluid according to the machining material; properly reduce the main declination angle, correctly sharpen the cutting edge of the reamer; properly reduce the reaming hole allowance; improve the position precision and quality of the bottom hole before the reaming hole or increase the reaming hole allowance; The use of qualified reamer; grinding edge zone width; reduce the number of reamer teeth according to the specific circumstances, increase the chip flutes space or CNC WeChat public number cncdar with a blade angle reamer, so that smooth chip removal; regular replacement reamer, Grinding the grinding zone when sharpening; Reamer should take protective measures to avoid bruising during sharpening, use and transportation; To hurt the reamer, apply ultrafine oil stone will hit the reamer Repair, or replace the reamer; use whetstone to be qualified, using a reamer with a rake angle of 5° to 10°. 6. The service life of the reamer is low The reamer material is not suitable; the reamer burns when sharpened; the cutting fluid is not properly selected and the cutting fluid does not flow smoothly; the surface roughness of the reamer after sharpening is too high. solution: According to the processing material selection reamer material, carbide reamer or coated reamer can be used; sharp cutting cutting amount is strictly controlled to avoid burns; the cutting fluid is correctly selected according to the processing material; the chips in the chip groove are often removed, and sufficient pressure is used The cutting fluid is refined or ground to meet the requirements. 7. The position accuracy of the hole of the hinged hole is very poor The guide sleeve wears; the bottom of the guide sleeve is too far from the workpiece; the guide sleeve has a short length and poor accuracy; the spindle bearing is loose. solution: Replace the guide sleeve regularly; lengthen the guide sleeve to improve the matching accuracy between the guide sleeve and the reamer clearance; timely repair the machine tool and adjust the bearing clearance of the main shaft. 8. Reamer blade chipping blade Reaming hole excess; workpiece material hardness is too high; cutting edge deviation is too large, uneven cutting load; reamer angle is too small, so that the cutting width increases; hinge deep hole or blind hole, too many chips It has not been cleared in time; the teeth have been worn out during sharpening. solution: Modify the pre-machined aperture size; reduce the hardness of the material or use a negative reamer or carbide reamer; control the deviation within the qualified range; increase the main angle; note the timely removal of chips or the use of a bladed reamer Pay attention to sharpening quality. 9. The reamer shank is broken Reaming allowance is too large; Reaming taper hole, roughing reaming allowances and cutting amount selection are not suitable; Reamer knife teeth space is small, chip jamming. solution: Modify the pre-machined aperture size; modify the margin allocation, and reasonably select the cutting amount; reduce the number of reaming cutters, increase the chip space or remove the tooth gap. 10. The centerline of the reaming hole is not straight Boring deflection before reaming, especially when the hole diameter is small, the reamer is not rigid enough to correct the original bending; the reamer has a large declination angle; poor guiding causes the reamer to easily deviate in the reaming. Direction; cutting part of the inverted cone is too large; reamer in the gap in the gap between the displacement of the hole; hand reaming, the force in one direction is too large, forcing the reamer to deflect to one end, destroying the perpendicularity of the reaming hole. solution: Increase hole expansion or boring process correction hole; reduce the main angle; adjust the appropriate reamer; replace the reamer with a guide part or lengthened cutting part; pay attention to correct operation. Noround Bath Mat,Large Bath Mat,Best Bath Mat,Slip Shower Mats Shenzhen Molding & Forming Industries Co.,ltd , https://www.mfi-cn.com