The knowledge of the machining center is complete.

The machining center integrates oil, gas, electricity and numerical control. It can realize the clamping of complex parts such as various discs, plates, shells, cams and molds. It can complete drilling, milling, boring, expanding and reaming. Rigid tapping and other processes, so it is the ideal equipment for high-precision machining. This article will share the skills of the machining center from the following aspects:

? How is the machining center facing the knife?

? How does the machining center produce and process deformable parts?

? Why should the machining center tool be passivated?

? How does the machining center reduce the surface roughness of the workpiece?

? What should I do after the machining center has finished working?

How is the machining center facing the knife?

1. Return to zero (return to machine origin)

Before turning the tool, be sure to perform zero return (return to the machine origin) to clear the coordinate data of the last operation. Note that the X, Y, and Z axes all need to be zeroed back.

2. Spindle forward rotation

In the "MDI" mode, the spindle is rotated forward by entering the command code and the medium rotation speed is maintained. Then change to the "handwheel" mode and operate the machine movement by switching the adjustment rate.

3.X to the knife

Use the tool to gently touch the right side of the workpiece to clear the relative coordinates of the machine; lift the tool in the Z direction, then move the tool to the left side of the workpiece, move the tool and workpiece along the Z down to the same height. Gently touch, lift the tool, write down the X value of the machine's relative coordinates, move the tool to half of the relative coordinate X, write down the X value of the machine's absolute coordinates, and press (INPUT) the input coordinate system. .

4.Y to the knife

Use the tool to gently touch the front of the workpiece to clear the relative coordinates of the machine; lift the tool in the Z direction, then move the tool to the back of the workpiece, move the tool and workpiece along the Z down to the same height. Gently touch, lift the tool, record the Y value of the machine's relative coordinates, move the tool to half of the relative coordinate Y, write down the Y value of the machine's absolute coordinates, and press (INPUT) the input coordinate system. .

5.Z to the knife

Move the tool to the surface of the workpiece to the Z-zero point, slowly move the tool to the top surface of the workpiece, record the Z-direction value in the coordinate system of the machine at this time, and press (INPUT) input. It can be in the coordinate system.

6. Spindle stop

First stop the spindle and move the spindle to the appropriate position to retrieve the machining program for formal machining.

How does the machining center produce and process deformable parts?

For parts with lighter weight, poor rigidity and weak strength, the parts are subject to heat and deformation during processing, and the high scrap rate results in a significant increase in cost. For such parts we must first understand the reasons for the deformation:

Force deformation:

Such parts are thin, and under the action of the clamping force, the thickness and thickness of the parts are likely to be different during the machining and cutting process, and the elasticity is poor, and the shape of the parts is difficult to recover by itself.

Heat deformation:

The workpiece is light and thin, and the workpiece is thermally deformed due to the radial force during the cutting process, so that the size of the workpiece is not accurate.

Vibration deformation:

Under the action of radial cutting force, the parts are prone to vibration and deformation, which affect the dimensional accuracy, shape, positional accuracy and surface roughness of the workpiece.

Processing method for easily deformable parts:

The easily deformable parts represented by thin-walled parts can be cut by high-speed machining with small feed rate and large cutting speed to reduce the cutting force of the workpiece during machining, and at the same time, most of the cutting heat is flying away from the workpiece at high speed. Take away, which in turn reduces the temperature of the workpiece and reduces the thermal deformation of the workpiece.

â–² thin wall parts

Why should the machining center tool be passivated?

CNC tools are not as fast as possible. Why do you need to passivate? In fact, tool passivation is not a literal understanding of the word, but a way to improve tool life. Improve tool quality through processes such as leveling, polishing, and deburring. This is actually a normal process before the coating is finished after the grinding.

â–² tool passivation contrast

The tool will be sharpened by a grinding wheel before the finished product, but the sharpening will result in different levels of micro-notch. The machining center can perform high-speed cutting while the micro-notch can be easily expanded to accelerate tool wear and damage. In modern cutting technology, the stability and precision of the tool are strictly required. Therefore, the CNC tool must pass the passivation treatment before the coating to ensure the firmness and service life of the coating. The benefits of tool passivation are:

1. Resistance to physical wear of the tool

During the cutting process, the surface of the tool will be gradually worn out by the workpiece. During the cutting process, the cutting edge is prone to plastic deformation under high temperature and high pressure. The passivation of the tool helps the tool to increase rigidity and avoid premature loss of cutting performance.

2. Maintain the smoothness of the workpiece

A burr on the edge of the tool can cause the tool to wear and the surface of the machined workpiece can become rough. After passivation, the cutting edge of the tool becomes very smooth, the chipping phenomenon is reduced accordingly, and the surface finish of the workpiece is also improved.

3. Convenient groove chip removal

Polishing the tool groove improves surface quality and chip removal performance. The flatter and smoother the groove surface, the better the chip removal, enabling more consistent cutting. After the passivation and polishing of the CNC tool in the machining center, many small holes will be left on the surface. These holes can absorb more cutting fluid during processing, which greatly reduces the heat generated during cutting, which greatly improves the cutting process. speed.

How does the machining center reduce the surface roughness of the workpiece?

The rough surface of the part is one of the common problems in CNC machining centers, which directly reflects the quality of the machining. How to control the surface roughness of the part processing, we must first deeply analyze the reasons for the surface roughness, including: the knife marks caused during the milling process; the heat deformation or deformation caused by the cutting separation; the tool and the machined surface Friction between.

When the surface roughness of the workpiece is selected, it should meet the requirements of the surface function of the part and economic rationality. Under the premise of satisfying the cutting function, a larger surface roughness reference value should be selected as much as possible to reduce the production cost. As the executor of the cutting center, the tool should pay attention to daily maintenance and timely grinding to avoid the surface roughness caused by the blunt tool being unqualified.

What should I do after the machining center has finished working?

The processing procedure of the traditional machine tool in the machining center is generally the same. The main difference is that the machining center completes all the cutting processes through one-time clamping and continuous automatic machining. Therefore, the machining center has to carry out some after the CNC machining. Work after the retreat."

1. Carry out the cleaning process. After the machining center completes the cutting task, it is necessary to remove the chips and wipe the machine in time, and keep the machine and the environment clean.

2. For the inspection and replacement of the accessories, first check the oil wiper on the guide rails and replace them if they are worn out. Check the status of lubricating oil and coolant. If turbidity occurs, it should be replaced in time. It should be added below the scale water level.

3. The shutdown program should be standardized, and the power supply and total power supply on the machine operation panel should be turned off in turn. In the absence of special circumstances and special requirements, the principle of zero return, manual, jog, and automatic should be followed. The machining center should also run at low speed, medium speed and high speed. The low-speed and medium-speed running time must not be less than 2-3 minutes without abnormality before starting work.

4. Standard operation, can not beat, correct, and correct the workpiece on the chuck, the top, must confirm that the workpiece and the tool are clamped before proceeding to the next step. The fuses and safety guards on the machine must not be disassembled and moved at will. The most efficient processing is in fact the safe processing. The operation of the machining center as an efficient processing equipment must be properly regulated. This is not only the maintenance of the current completed process, but also the preparation for the next start.

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