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Seven steps for operating CNC machining center

1. Preparation before startup

When the CNC machining center is started or reset after pressing the emergency stop, first return to the reference zero position of the CNC machining center,Only in this way can we ensure that the operation of the CNC machining center has a datum position.

2. Clamping workpiece

The surface of the workpiece must be cleaned before clamping to keep it smooth and flat without oil stain. And remove the burrs on the surface of the workpiece with a file or oilstone.

The pad iron used for clamping must often be ground smooth processing, so that its surface is smooth, level off.  The weights and nuts must be strong enough to grip the work reliably.  CNC machining center worktables should be kept clean.  No iron filings, dust and oil stains.  The pad iron is generally placed in the four corners of the workpiece, and the workpiece with a large span needs to be placed in the middle of the high pad iron.

Use a ruler to measure the length, width and height of the workpiece and compare them with the dimensions on the drawing.  Confirm conformity.

When clamping the workpiece, it should be placed according to the clamping method of the programming operation instruction, so as to avoid the parts that need to be processed and the tool head touching the fixture during processing.

After the workpiece is placed on the pad iron, it is necessary to pull the workpiece datum according to the drawing requirements, and verify the verticality of the workpiece for six surfaces that have been ground.

After the workpiece calibration must be tightened nut, in order to prevent the workpiece because the clamping is not firm enough to shift phenomenon in processing, confirm the workpiece clamping error does not exceed the range.

3. Find the zero of the workpiece

The clamping workpiece can use touch point sensor to determine the processing reference zero.  The touch point sensor can be of both photoelectric and mechanical type.

4. Prepare all cutting tools according to programming instruction

According to the tool data in the programming instruction, replace the tool that needs to be used.  Let the cutter touch the height gauge placed on the datum and set the relative coordinate of the point to zero when the gauge is red.  Find the zeros of the three axes according to the correct method.

5. Setting of machining parameters

Setting of spindle speed in machining：N=1000*V/（3.14*D）

N: Spindle speed（rpm/min）

V：cutting speed（m/min）

D：Tool diameter（mm）

Feed rate setting for machining：F=N*M*Fn

F：Feed speed（mm/min）

M：Cutter blade number

Fn：The amount of cutting by a tool

Cutting amount per blade setting：Fn=Z*Fz

Z：The number of blade of the knife

Fz：The amount of cutting per blade of a tool

6. Start the machine for processing

At the beginning of each procedure all cutting tools must be carefully checked to see if they meet the machining requirements.  At the beginning of processing to adjust the feed speed to the minimum, fast positioning, falling knife, feeding must concentrate, hand should be placed on the stop button to ensure that there is a problem can immediately stop, pay attention to observe the direction of the movement of the tool to ensure safe feeding, and then slowly increase the feed speed to the appropriate speed.  The tool and workpiece should be cooled at the same time.

7. Contents and scope of worker self-inspection

Before processing must first understand the workpiece needs to be processed parts, shapes, drawings of each size and also know the process of processing content.

Before the workpiece is clamped, the blank size must be measured to see whether it meets the requirements of the drawing. When the workpiece is clamped, the correct position must be carefully checked.

In the rough machining should be timely self-inspection, in order to have the error of the data timely adjustment.  Self-check content is mainly for the position and size of the machining parts.  Such as whether the workpiece is loose, whether the workpiece is correctly divided, processing parts to the reference edge or reference point size is in line with the requirements of the drawings.  The position size of the machining parts to each other.  Rough shape should be measured after checking position dimensions.

After the operator completes the self-inspection of the workpiece, the workpiece can be removed and sent to the inspector for special inspection only after confirming that the workpiece meets the requirements of the drawing.

Working principle and precautions for the lubrication system of machining center?

The lubrication system is an important system device for transporting hydraulic oil on the surface of various parts to reduce liquid friction and working resistance. It is an important device on the equipment of the CNC machining center. What requirements should the lubrication system of the machining center meet?

The working principle of the machining center lubrication system is simple, that is, the flow of compressed air in the pipeline, driving the lubricating oil along the inner wall of the pipeline continuous flow, the oil and gas mixture and transport to the machining center spindle part and screw and other parts need lubrication.

What requirements should the lubrication system of the machining center meet:

1, environmental protection, no pollution.  Ensure that there is no oil pollution and fog, the surrounding environment is not polluted;

2. Accurate oil supply.  Can be increased by regulating valve, oil according to different needs to transport to the spindle and screw lubrication points;
3. There is no problem of difficult atomization of high viscosity lubricating oil; Suitable for any oil;
4. Automatic detection and monitoring.  Can detect whether the lubricating oil is normal, if poor lubrication, can alarm stop, avoid abnormal operation of equipment;
5. Especially suitable for the rolling bearing of the spindle, with a certain air cooling effect, can reduce the running temperature of the bearing, thus prolonging the service life of the spindle;
6. Low fuel consumption and cost saving.

When the user selects the lubricating oil for the CNC machining center lubrication system, it is best to choose the lubricating oil with high purity and less impurities, and to clean the filter regularly to avoid unnecessary trouble caused by blockage and ensure that the system works in a safe state.

We have a professional technical team, Our machines have CE certification and are exported to many countries with reliable quality. if you want to know more, please contact us. Tsinfa company will be your best choice