What are the factors that affect the roundness of CNC lathes?

In practice, there are generally only two factors;

1.The spindle is misaligned with the tailstock (this is the most direct and common factor).

2.If it is a large workpiece, such as a lathe of the CKA61250*12*60 series, the front center hole must be pressed against the front center hole with the front center, otherwise the finished product will be flattened. (That is, it has to be clamped tightly, and the workpiece must not move).

Other small reasons are the deformation of the turning tool when heated. (Not much impact).

Too much tailstock pressure (for slender shafts).

And the rest, for example, rotational speed, feed, and so on, are theoretical; In practice, it is negligible;

1: Runout when the spindle of the lathe spindle rotates.

2: Workpiece clamping.

3: The locking degree of the tool holder.

4: The size of the feed amount.

5: The speed of the spindle.

There are many reasons for this: bad spindle bearing, tool wear, broken tailstock tip bearing.

There are actually many factors that affect the roundness deviation, and I don't know much about it, so let's talk about it.

The reason for the machine tool, the rigidity of the machine tool, the level, the accuracy of the individual feed axes, the sluggishness of the system.

Improper process arrangement, feed speed and linear speed are too high, which affects the stability of the machine tool, and the finishing margin is slightly larger.

For the problem of tool selection, a sharp tool should be selected, and the cutter holder should be preferably made of solid alloy.

The workpiece has a taper, and the roughness is unqualified.

I know a little bit about it.,I hope there's something that can help you.,If you click here.。

The various factors that affect the accuracy and performance of instrumentation are:

1.The force value sensor of the instrument, because the quality of the sensor determines the accuracy and force measurement stability of the testing machine.

2.The ball screw, the component that drives the movement of the sensor, because if there is a gap in the screw, the test data made in the future will directly affect the maximum deformation and elongation after break.

3.The transmission system of instrumentation, the transmission system of the tensile machine on the market now uses a reducer, and some use ordinary belts, the main drawbacks of these two transmission methods: the former needs to add lubricating oil regularly, and the latter can not ensure the synchronization of the transmission to affect the test results.

4.The power source (motor) of the electronic tensile testing machine is also called the motor, and now some tensile machines on the market use ordinary three-phase motors or frequency conversion motors, which are controlled by analog signals, and the control response is slow and the positioning is not accurate.

5.The measurement and control system of electronic tensile test equipment (that is, software and hardware), most of the measurement and control systems of tensile machines on the market now use 8-bit single-chip microcomputer control, which has a low sampling rate and poor anti-interference ability.

There are many positive factors, mainly divided into internal factors and external factors, internal factors mainly refer to a, the accuracy of the machine tool itself, including the strength of the bed material, the accuracy of the screw and nut, the accuracy of the servo motor, the accuracy of the detection device and whether there is a placement level during installation, etc.; b. The way of workpiece clamping will also affect the machining accuracy; c. The machining path has a great impact on the deformation and accuracy of the workpiece; d. The skill level of the operator.

The external factors are mainly a, the temperature and air pressure of the environment where the machine tool is located, etc.; b. Is there any large machinery operating nearby that causes a large vibration?

The above is purely a personal opinion......

If the accuracy of the machine tool itself is not considered, the following points have a greater impact.

1. Clamping of the workpiece.

2. Deformation of the workpiece during processing.

3. Knives.

Machine stability, materials, tools, coolant, operators, etc.

Summary. When turning the workpiece, the roundness does not meet the requirements, and what are the reasons for it from the machine tool.

When turning the workpiece, the roundness does not meet the requirements, and what are the reasons for it from the machine tool.

When turning the workpiece, the roundness does not meet the requirements, and what are the reasons for it from the machine tool.

Based on what you have learned, please talk about how to unremittingly promote the construction of 'intrinsic safety'.

1. The gap between the front and rear bearings of the spindle is too large, and the roundness of the 2.

It was not tightened, it was not found properly, and the material was not well quenched. Tool wear.

A strange incident has happened in the past few days, and the outer diameter is always the same after every boot. If you don't reboot there is no problem, what kind of fault is this?

The roundness of the spindle is not good, will the product that comes out of the car be good?

Summary. 2.Problems with the workpiece you are machining.

Is it that you have clamped the workpiece to be processed too hard? Or there is no clamping. The force used was too great to flatten the workpiece.

You look like all the workpieces are on the car. = Take the workpiece down after you finish machining. And he was deformed.

If the force is too small, not only will this happen. Also, you need to pay attention to the temperature of the workpiece during machining. Control the temperature carefully.

When you need to cool down, boil the water. Excessive temperature can also deform the machined workpiece. Produces elliptical.

How about the spindle of the lathe, so that the workpiece turned out of the roundness error.

The workpiece processed by the lathe has a roundness error, what is the influence?

Okay, dear, here is some information for you.

1.It's the fault of your lathe. You carefully inspect the gap between a small pallet and a medium pallet and a large pallet.

The guide rail surface has a dirty east and a beautiful west. It will lift the pallet board. Eat the knife at once and don't eat the knife at the same time.

This way the workpiece is elliptical.

2.Problems with the workpiece you are machining. Is it that you have clamped the workpiece to be processed too hard?

Or there is no clamping. The only force used was too big to flatten the workpiece. You look like all the workpieces are on the car.

= Take the workpiece down after you finish machining. And he was deformed. If the force is too small, not only will this happen.

Also, you need to pay attention to the temperature of the workpiece during machining. Control the temperature carefully. When you need to cool down, boil the water.

Excessive temperature can also deform the machined workpiece. Produces elliptical.

3.Note: Lu is righteously meaning your turning knife. If the knife doesn't work, it must be sharpened again. Excessive wear of the turning tool should be avoided. If the turning tool is excessively worn. He Bureau Kai is not working in the car. It's a forcible feed. Do you want to be able not to be elliptical?

If it helps you, please give a thumbs up, thank you.

If the accuracy of the machine tool itself is not considered, the following points have a greater impact.

1. Clamping of the workpiece.

2. Deformation of the workpiece during processing.

3. Knives.

It depends on how advanced it is, and the domestic ones can also achieve straightness and repeated positioning accuracy, but even if the accuracy of the CNC machine tool is not high, the error can be eliminated through CNC compensation in the processing process to achieve the required machining accuracy.