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Operation of CNC machining centers

- Mar 22, 2018 -

Operation of CNC machining centers

After every machine start or after the machine presses the emergency stop reset, the machine first returns the machine reference zero (ie, zero return), so that the machine has a reference position for its subsequent operation.

Clip the workpiece

Before the workpiece is clamped, it is necessary to clean the surfaces first, do not stick with oil, iron and dust, and use a guillotine (or stone) to remove the burrs on the surface of the workpiece.

The isobars used for the fixture must be smoothed and smoothed by grinding the surfaces. Code iron and nuts must be strong, can reliably clamp the workpiece, and some small pieces that are difficult to clamp can be directly clamped on the tiger; the machine table should be clean, no iron, dust, oil; general horn In the four corners of the workpiece, it is necessary to add equal height horns to the workpieces with too large spans.

According to the size of the drawing, use a pulling rule to check the length and width of the workpiece.

When clamping the workpiece, according to the method of setting and placing the programming instructions, it is necessary to consider avoiding the machining part and the condition that the cutter head might hit the fixture during the machining.

After the workpiece is placed on the horn, the reference surface of the workpiece must be pulled according to the drawing requirements. If the workpiece has been ground on six sides, check whether the verticality is acceptable.

After the workpiece pulls the watch to complete, must tighten the nut, in order to prevent the clamping is not firm and causes the work piece to shift the phenomenon in the processing; Pulls the table once again, confirms that the error after the clamping is not excessive.

Number of workpiece touches

For the clamped workpiece, the number of contacts can be used to set the number of touch reference points, and the touch number can be used for both photoelectric and mechanical types. There are two types of methods: mid-stroke touch and single touch touch.

Photoelectric stationary, mechanical speed 450~600rpm. Move the X-axis of the worktable to the center of the number of touch points, so that the number of touches touches the side of the workpiece. When the number of touches hits the workpiece and the red light is on, the relative coordinate value of this point is set to zero; The X-axis of the table touches the other side of the workpiece and the relative coordinates of the workpiece are recorded when the number of touches just hits the workpiece.

Based on its relative value minus the diameter of the touch head (ie, the length of the workpiece), check that the length of the workpiece meets the drawing requirements.

Divide this relative coordinate number by 2, the resulting value is the middle value of the workpiece X-axis, then move the table to the middle value on the X-axis, and set the relative coordinate value of the X-axis at this point to zero, this is the workpiece Zero on the X axis.

Carefully record the zero machine coordinate value on the X axis of the workpiece in one of G54 to G59, and let the machine determine the zero position of the workpiece on the X axis. Again carefully check the accuracy of the data. The workpiece Y axis zero setting procedure is the same as the X axis operation.

Prepare all tools according to the programming instructions

According to the tool data of the programming work instruction book, replace the tool to be processed, and let the tool touch the height measuring instrument placed on the reference plane. When the red light of the measuring instrument is on, the relative coordinate value of this point is set to zero. Die magazine micro-letter is good, worthy of attention! Move the tool to a safe place, manually move the tool 50mm downwards, and set the relative coordinate value of this point to zero again. This is the Z-axis zero position.

Record this machine coordinate Z value in one of G54~G59. This completes the zero setting of the workpiece X, Y, and Z axes. Again carefully check the accuracy of the data.

The unilateral impact number also touches the X and Y axes of one side of the workpiece according to the above method. The X, Y axis's relative coordinate value is offset by the radius of the X, Y axis, and the last point is the point. The mechanical seat marks on the X and Y axes are in one of G54~G59. Again carefully check the accuracy of the data.

Check the correctness of the zero point and move the X and Y axes to the side of the workpiece. According to the size of the workpiece, visually check the correctness of the zero point.

Copy the program file to the computer according to the file path of the programming job guide.

Processing parameter setting

Spindle speed setting during 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 rate (mm/min)

M: cutting edge number

Fn: cutting amount of tool (mm/rev)

Set the cutting amount per blade: Fn=Z×Fz

Z: The number of blades of the tool

Fz: cutting amount per blade (mm/rev)

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