7 steps to operate CNC machining center

1. Startup preparation

 

After each startup or emergency stop reset of the machine tool, please return to the reference zero position (i.e., return to zero) so the machine tool has a reference position for its subsequent operation.

 

2. Clamping workpieworkpiecere the workpieworkpiecemped, the surfaces shall be cleaned first, without oil, dirt, iron chips, and dust, and the burrs on the workpieworkpiecee shall be removed with a file (or oilstone). CNC machining part

 

The high-speed rail for clamping must be ground smooth and flat by a grinding machine. The block iron and nut must be firm and can clamp the workpieworkpiecely. Some small workpieworkpiecesre that are difficult to clamp can be directly clamped on the tiger. The working table of the machine tool should be clean and free of iron chips, dust, and oil stains. The pad iron is generally placed at the four corners of the workpieworkpieceorkpieworkpiecesoo a large span, so it is necessary to add the high pad iron in the middle. CNC milling part

 

Check whether the length, width, and height of the workpieworkpiecesalified by using the pull rule according to the size of the drawing.

 

When clamping the workpieworkpieceding to the clamping and placement mode of the programming operation instruction, avoiding the processing parts and the situation in which the cutter head may encounter the clamp during the processing is necessary. CNC machined 

 

After the workpieworkpiececed on the sizing block, the reference surface of the workpieworkpiecebe drawn according to the requirements of the drawing, and the perpendicularity of the workpieworkpieceas been ground on six sides shall be checked to see whether it is qualified.

 

After the completion of the work-workpiece, the nut must be tightened to prevent the work-piworkpiecehifting during the processing due to the insecure clamping; pull the work-piworkpieceto make sure that the error is not more than the error after the clamping.

 

3. Collision number of workpieces: The clamped workpiece number of bumps can be used to determine the reference zero position for machining, and the number of bumps can be either photoelectric or mechanical. There are two kinds of methods: middle collision number and single collision number. The steps of the middle collision number are as follows:

 

Photoelectric static, mechanical speed 450 ~ 600rpm. Manually move the x-axis of the worktable to make the colliding head touch one side of the workpiece. The colliding head touches the workpieworkpiecee. The red light is on, and the relative coordinate value of this point is zero. Then, manually move the x-axis of the worktable to make the colliding head touch the other side of the workpieworkpiecethe colliding head touches the workpieworkpieced the relative coordinate at this time.

 

According to the relative value minus the diameter of the collision head (i.e., the length of the workpieworkpiecek), the workpieworkpiecethe requirements of the drawing.

 

Divide this relative coordinate number by 2, and the resulting value is the middle value of the x-axis of the workpieworkpiecemove the worktable to the middle value of the x-axis, and set the relative coordinate value of this X-axis to zero, which is the zero position of the x-axis of the workpieworkpieceefully record the mechanical coordinate value of the zero position on the x-axis of the workpieworkpiece of G54-G59, and let the machine tool determine the zero position on the x-axis of the workpieworkpiece the correctness of the data carefully again. The procedure for setting the zero position of the Y-axis of the workpieworkpiece is the same as that of the X-axis

 

4. Prepare all tools according to the programming operation instruction

 

According to the tool data in the programming operation instruction, replace the tool to be processed, let the tool touch the height measuring device placed on the reference plane, and set the relative coordinate value of this point to zero when the red light of the measuring device is on. Mold Man magazine WeChat is excellent and worthy of attention! Move the tool to a safe place, manually move the tool down 50mm, and set the relative coordinate value of this point to zero again, which is the zero position of the Z axis.

 

Record the mechanical coordinate Z value of this point in one of G54-G59. This completes the zero setting of X, y and Z axes of the workpieworkpiece the correctness of the data carefully again.

 

The one-sided collision number also touches one side of the x-axis and Y-axis of the workpiece, according to the above method. Offset the relative coordinate value of the x-axis and Y-axis of this point to the radius of the collision number head, which is the zero position of the x-axis and y-axis. Finally, record the mechanical coordinates of the x-axis and Y-axis of a point in one of G54-G59. Again, check the correctness of the data carefully.

 

Check the correctness of the zero point, move the X and Y axes to the side suspension of the workpieworkpieceisually check the correctness of the zero point according to the size of the workpieworkpiecey the program file to the computer according to the file path of the programming operation instruction.

 

5. Setting of processing 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 speed setting of machining: F = n × m × FN

 

F: feed speed (mm/min)

 

M: number of cutting edges

 

FN: cutting amount of tool (mm/revolution)

 

Cutting amount setting of each edge: FN = Z × FZ

 

Z: number of blades of the tool

 

FZ: cutting amount of each edge of the tool (mm/revolution)

 

6. Start up processing

 

At the beginning of each program, it is necessary to carefully check whether the tool used is the one specified in the instruction book. At the beginning of machining, the feed speed shall be adjusted to the minimum and carried out in a single section. When positioning, dropping, and feeding rapidly, it shall be concentrated. If there is a problem with the stop key, stop immediately. Pay attention to observing the moving direction of the cutter to ensure safe feeding, and then slowly increase the feed speed to the appropriate level. At the same time, add coolant or cold air to the cutter, and workpieworkpiece rough machining shall not be too far away from the control panel, and the machine shall be stopped for inspection in case of any abnormality.

 

After roughening, pull the meter again to ensure the workpieworkpiece is loose. If any, it must be recalibrated and touched.

 

The processing parameters are constantly optimized to achieve the best processing effect.

 

Since this process is critical, after the workpieworkpiececessed, the primary dimension value shall be measured to see whether it is consistent with the drawing requirements. If there is any problem, immediately inform the team leader or programmer on duty to check and solve it. It can be removed after passing the self-inspection and must be sent to the inspector for special inspection.

 

Processing type: hole processing: before drilling on the processing center, the center drill must be used for positioning, then the drill bit 0.5 ~ 2mm smaller than the drawing size shall be used for drilling, and finally, the appropriate drill bit shall be used for finishing.

 

Reaming processing: to ream the workpieworkpiece, use the center drill for positioning, then use the drill bit 0.5 ~ 0.3mm smaller than the drawing size to drill, and finally, use the reamer to ream the hole. Pay attention to controlling the spindle speed within 70 ~ 180rpm / min during reaming.

 

Tedious processing: for the tedious processing of workpieworkpieces, use the center drill to locate, then use the drill bit, which is 1-2mm smaller than the drawing size, and then use the coarse boring cutter (or milling cutter) to process to the left side with only about 0.3mm machining allowance, and finally use the fine boring cutter with pre-adjusted size to finish boring, and the last acceptable boring allowance shall not be less than 0.1mm.

 

Direct numerical control (DNC) operation: before DNC numerical control processing, the workpieworkpiecebe is clamped, the zero position shall be set, and the parameters shall be set. Open the processing program to be transferred to the computer for inspection, then let the computer enter the DNC state and input the file name of the correct processing program. Daren micro signal: mujuren presses the taped key, and the program starts the key on the machine tool, and the word LSK flashes on the machine tool controller. Press the enter keyboard on the computer to process the DNC data transmission.

 

7. Contents and scope self-inspectionion

 

Before processing, the processor must see the contents of the process card, clearly know the parts to be processed, the shapes and dimensions of the drawings, and see the processing contents of the nfollowingprocess.

 

Before workpieworkpieceng, measure whether the blank size meets the drawing requirements, and check whether the placement of workpieworkpiecesistent is consistent with the programming operation instructions.

 

Self-inspection shall be carried out after rough machining to adjust the data for errors in time. Self-inspection content is mainly about the position and size of processing parts. For example, the position dimension between the processing parts, whether the workpiece is divided correctly, whether the dimension from the processing part to the reference edge (reference point) meets the drawing requirement, and the position dimension between the processing parts. After checking the position and dimension, measure the rough machined shape ruler (excluding arc).

 

Finish machining can only be carried out after rough machining and self-inspection. After finishing, the workers shall conduct self-inspection on the shape and size of the processed parts: inspect the basic length and width of the processed parts of the vertical surface and measure the base point size marked on the drawing for the processed parts of the inclined surface.

 

The workers can remove the workpiece and send it to the inspector for special inspection after completing the self-inspection of the workpiece, confirming that it conforms with the drawings and process requirements.

 

CNC Milled Aluminum	Aluminum Machining Parts	Axis Machining
CNC Milled Parts	Aluminum CNC Parts	Machining
CNC Milling Accessories	CNC Turning Parts	China CNC Machining Parts Manufacturer