Machining Center Processing Seven Steps

- Sep 20, 2017 -

First, boot ready

Machine tool at each power-on or machine tool according to emergency stop reset, first back to the machine tool reference 0 bits (that is, back to 0), so that the machine tool for its subsequent operation has a benchmark position.


The workpiece must be cleaned before it can be stuck with oil, iron and dust, and the burr on the surface of the workpiece is removed with a file (or oil stone).

The high iron of the clamping machine must be smoothed and leveled by grinding the surface of the grinder. The code iron, the nut must be sturdy, can fasten the workpiece reliably, for some difficult to clamp the small workpiece can be directly clamped on the tiger; Machine Tool Workbench should be clean and clean, no iron filings, dust, oil pollution; Mat iron is generally placed in the corners of the workpiece, the span of the workpiece need to be placed in the middle of the high cushion iron.

According to the size of the drawing, use the drawing ruler to check whether the workpiece's long width and height are qualified.

When clamping the workpiece, according to the layout of the programming work instruction, we should consider avoiding the parts of the machining and the situation that the cutter head may encounter the fixture in the process.

After the workpiece is placed on the mat iron, it is necessary to pull the surface according to the drawing requirements for the workpiece datum, and to check whether the verticality is qualified for the workpiece that has been polished on six sides.

After the workpiece pull the table must tighten the nut, to prevent the clamping of the workpiece in the process of the displacement of the phenomenon; then pull the table once, to determine that the error is not very bad after clamping.

Third, the number of workpiece touch

For the clamping workpiece can be used to touch the number of the head of the processing reference 0, touch the number of the head can be photoelectric and mechanical type two. The method has two kinds of touching number and one-sided touch, and the steps are as follows:

Electro-optical static, mechanical speed 450~600rpm. Touch the number of manual moving worktable x-axis, so that touch the head of the workpiece one side, when the bump head just touches the workpiece to make the red light light, the relative coordinate value of the set point is zero; then manually move the x axis of the worktable to touch the other side of the workpiece, and when the head hits the workpiece, note the relative coordinates.

According to its relative value minus the diameter of the bump head (that is, the length of the workpiece), check the length of the workpiece to see if the drawing requirements.

Divide the relative coordinate number by 2, the value is the median value of the x axis of the workpiece, then move the center value of the worktable to the x-axis, and set the relative coordinate value of the x axis to zero, which is 0 bits on the workpiece x axis.

Carefully record the 0-bit mechanical coordinate value of the workpiece X axis in one of the g54~g59, so that the machine tool determines the 0 bits on the x axis of the workpiece. Check the correctness of the data again. The steps for the 0-bit y-axis of the workpiece are the same as the x-axis operation.

Prepare all the tools according to the programming instructions.

According to the tool data of the programming work instruction, replace the tool to be machined, let the cutter touch the height measurer on the datum plane, and set the relative coordinate value to zero when the measuring light is red. Move the tool to a safe place, manually move the tool down 50mm, and then set the relative coordinate value to zero, which is 0 bits of the z axis.

The mechanical coordinate z value of this is recorded in one of the g54~g59. This completes the 0-bit setting of the workpiece X, Y, and Z axes. Check the correctness of the data again.

One-sided touch is also the same as the above method to touch the workpiece X, on one side of the y-axis, shifting the relative coordinates of the x and Y axes of this point to the radius of the head is the 0 bits of the x and Y axes, and finally the mechanical coordinates of the x and Y axes are recorded in one of the g54~g59. Check the correctness of the data again.

Check the correctness of 0 points, move the x, Y axis to the edge of the workpiece, according to the size of the workpiece, the accuracy of the 0 point visual.

The program files are copied to the computer according to the file path of the programming job instruction.

V. Setting of processing Parameters

The setting of spindle speed in machining: n=1000xv/(3.14xD)

N: Spindle speed (rpm/min)

V: Cutting Speed (/)

D: Tool Diameter (mm)

Processing feed speed setting: F=NXMXFN

F: Feed Speed (mm/min)

M: Tool Blade number

Fn: Cutting capacity of cutters (mm/rpm)

Cutting per blade setting: FN=ZXFZ

Z: Blade Number of Cutter

Fz: Cutting capacity per blade (mm/rpm)

Six, boot processing

At the beginning of each program, you must carefully check whether the tool it is using is the tool specified on the Programming Guide. Start processing to the minimum feed speed, one-section execution, rapid positioning, cutting, into the knife must concentrate, the hand should be placed on the Stop button immediately stopped, pay attention to observe the direction of the tool movement to ensure safe access to the knife, and then slowly increase the feed speed to the appropriate, while the tool and workpiece to add coolant or cold wind.

Open roughing should not be too far from the control panel, abnormal phenomenon of timely downtime check.

After roughing the table again, make sure the workpiece is not loose. If there is a need to recalibrate and touch the number.

In the process of continuous optimization of processing parameters, to achieve the best processing effect.

Because this process is the key process, so after the workpiece processing, should measure its main size and the requirements of the drawings are consistent, if there is a problem immediately notify the shift leader or programmer to check, solve, after the self-test qualified can be removed, and must send inspectors to the special inspection.

Processing type:

Hole Processing: In the machining center before drilling must first use the central drill positioning, and then use than the size of the drawing 0.5~2mm drill bit drilling, and finally with a suitable bit finishing.

Reaming machining:

It is also necessary to use the center drill to locate the workpiece, and then to use 0 less than the size of the drawing. 5~0.3mm bit drilling, and finally with Reamer reaming, reaming machining attention to control spindle speed in 70~180rpm/min.

Boring machining:

The boring process of the workpiece should be positioned first with a central drill, and then use a bit of 1~2mm than the size of the drawing drill hole, and then with a coarse boring knife (or milling cutter) to the left side of the 0.3mm processing allowance, the final use of a preset size precision boring knife boring, the last fine boring allowance can not be less than 0.1mm.

Direct CNC (DNC) Operation:

In the DNC CNC machining before the workpiece to be installed, set a good 0-bit, set good parameters. In the computer, open the processing program to be passed to check, and then let the computer into the DNC state, and enter the correct processing program file name. In the processing machine tool Press tape key and program start key, then the machine controller appears flashing LSK words. The transmission of DNC can be carried out by pressing the return keyboard on the computer.

VII. Content and scope of self-examination of workers

The processor must see clearly the contents of the process card before processing, and know clearly the parts, shapes and drawings of the workpiece to be machined, and know the contents of the working process.

Workpiece clamping should be measured before the size of the blanks to meet the requirements of the drawings, workpiece clamping must be carefully checked if the placement and programming instructions.

After the roughing is completed, the self-test should be done in time to adjust the error data in time. Self-test content mainly for the location of the processing site size. As:

Whether the workpiece is loose, whether the workpiece is correctly divided, the size of the machining part to the Datum edge (datum point) conforms to the drawing requirement, and the position dimension between the parts of the machining area. Measure the shape ruler of the roughing after checking the position size (except for circular arcs).

Refined processing is carried out after the inspection of roughing. After finishing, the workers should check the shape and size of the machined parts: to detect the basic length and width of the machined parts of the vertical surface, and to measure the base dimensions of the machined parts of the bevel on the drawing.

The worker completes the workpiece self-inspection, confirms that the drawing and the craft request conform to the rear can remove the workpiece to send the inspector for the special inspection.

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