Trouble shooting and elimination method of CNC cylindrical grinder:
At present, China's CNC machine tools developed from 50s to now have 40 years of history, with electronic technology, computer technology, automatic control, precision measurement technology to improve and progress, status of CNC machine tools in the machine manufacturing industry has shown strong advantage. The numerical control machine tool CNC cylindrical grinding machine solves the problem of complex shape and high precision, which meets the requirements of large batch, high precision, stable product quality and high production efficiency. To improve the working conditions and labor intensity of workers.
CNC cylindrical grinder and common fault removal methods, CNC cylindrical grinder grinding chatter flake grain, appear twill, end surface cylindrical grinder external cylindrical grinding, appear vibration surface, grinding CNC high speed angularapproachcylindrical cylindrical, vibration lines (flake pattern, workpiece surface twill, spiral) problem, spiral) problem.
The main cause of the problem:
(1) diamond knife seat fixed with surface contact is not good;
(2) the spindle clearance of the grinding wheel is too large;
(3) grinding head, grinding wheel speed parameter, the improper choice of dressing speed;
(4) the choice of the type of the grinding wheel and the workpiece material is not matching.
(1) re scraping diamond cutter fixing seat, the combination of good, good fastening, with the diamond knife head, move, should not exceed 0.01mm, and should consider factors such as whether the sharp diamond knife;
(2) clearance pressure grinding wheel spindle (including radial and axial) should be within the prescribed range (range: 0.027 ~ 0.03mm, axial radial: 0.02mm), at the same time to consider the general control in the static pressure (15kg ~ 18kg / C M), dynamic pressure is established, the fuel injection hole.
What are the common faults of the cylindrical grinder, the following M131W universal grinder as an example:
First, the cause of the surface of the workpiece grinding machine grinding causes:
1, grinding wheel static balance.
2, the hardness of the grinding wheel is too high or the viscosity of the grinding wheel is uneven, the grinding wheel becomes blunt, and the friction of the workpiece increases, so that the periodic vibration of the workpiece is increased.
3, grinding wheel spindle wear, with the clearance of the spindle in the rotation of the float, so that the wheel imbalance, vibration.
4, wheel flange and wheel spindle taper cone end with poor contact caused by grinding wheel.
5, grinding wheel motor vibration, the transmission belt is too tight, loose or inconsistent length of vibration.
6, grinding wheel motor balance difference.
7, the workpiece center hole and the top contact bad.
8, the top of the workpiece is not appropriate, the rotation of the workpiece is not uniform tight, too loose to reduce the rigidity of the system.
Two, the surface of the workpiece grinding machine spiral:
The main reason is that the generatrix of the grinding wheel is bad, and there are concave and convex phenomenon, so that the surface of the grinding wheel and the workpiece is only part of the contact:
1, the machine tool table longitudinal velocity and workpiece rotation speed is too high.
2, the grinding wheel axis and the machine tool table rail is not parallel.
3, the machine tool table rail lubrication oil pressure, and too much, resulting in the table floating.
4, grinding, edge chamfering.
5, the grinding wheel, uneven cooling and.
6, the horizontal feed is too large.
7, grinding wheel dressing.
8, tail frame sleeve and the top cone with bad.
9, the machine tool worktable moves crawling.
Reason three, cylindrical grinder workpiece when the workpiece surface is suddenly galling traces, is mainly due to the coarse granularity of grinding particle shedding, clamp is formed between the grinding wheel and workpiece:
1, coarse grinding remains in fine grinding without abrasion.
2, the cooling fluid in the presence of abrasive particles.
3, material toughness is too large.
4, the coarse grain grinding wheel in the first dressing good wear off.
5, the grinding wheel is too soft.
6, the grinding wheel is not well trimmed, there are convex abrasive particles in the grinding of abrasive particles broken or fall off.
Four, cylindrical grinder workpiece surface with fine stucco traces, the main reason is the fine-grained grinding particle broken or off is formed between the grinding wheel and workpiece:
1, the grinding wheel is too soft.
2, grinding wheel wear toughness and toughness of the workpiece material inappropriate.
3, the cooling liquid is clean, resulting in or out of the coolant in the fine particles of abrasive block extrusion roll between the grinding wheel and the workpiece caused by.
Five, surface grinder workpiece with scale shaped rough surface is mainly due to the surface of the wheel cutting edge is not sharp, eating live in grinding phenomenon occurred.
1, grinding wheel surface is blocked.
2, grinding wheel not repair the circle.
3, the wheel dressing is not sharp enough.
4, dresser without fastening or diamond without welding, caused by vibration in the grinding wheels.
5, diamond taper shank stretched out too long, the impact of rigidity, in the grinding wheel caused by beating.
Six, the main causes of the workpiece surface burns when the external cylindrical grinding machine:
1, the grinding wheel is too blunt.
2, improper choice of grinding dosage.
3, the cooling conditions of the workpiece is poor.
4, excellent organization on the mountain, tight, or grinding wheel size too small is not sharp.
5, the amount of feed is too large.
Seven, cylindrical grinding machine workpiece surface super cylinder;
1, the center hole is not good, the hole has stolen goods.
In 2, the top top top hole is not tight, spindle bearing clearance is too large, due to swing grinding.
3, the wheel spindle and the bearing clearance.
4, the workpiece stiffness is poor, blank shape error.
5, the workpiece is not balanced.
6, with chuck clamping cylindrical grinding spindle, large radial runout.
Eight, the surface of the workpiece grinding machine taper:
1, machine bench scale is not adjusted.
2, due to the workpiece and machine tool elastic deformation and make the machine tool precision change.
3, the workpiece rotation axis and the machine tool table movement direction is not parallel.
4, the machine tool table rail float.
5, headstock and tailstock center line thimble coaxial tolerance.
6, the central support block adjustment improper.
7, the workpiece stiffness, elastic deformation.
Nine, the external cylindrical grinding machine workpiece surface of the end of the runout is too large for the following reasons:
1, the amount of feed is too large, the knife back too fast.
2, the top of the workpiece is too tight or too loose.
3, the grinding wheel spindle axial movement.
4, spindle thrust bearing clearance.
5. The center line of the grinding wheel spindle is not parallel to the motion direction of the machine table.
6, grinding wheel and workpiece contact area, grinding pressure.
Ten, cylindrical grinding machine cylindrical workpiece to produce the difference between the drum or saddle:
1, machine tool installation level changes.
2, the workpiece stiffness is poor, the grinding knife.
3, the central frame adjustment is not in place.
4, the long axis of grinding peaked too tight, the bending deformation of the workpiece.
5, the surface of the grinding wheel is not sharp.