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Points for processing cnc

Back to list 发布日期:19年02 月06日 Source: Jindong Metal Products Release Date: February 06, 19

First, the workpiece is overcut

the reason:

1. Spring the knife. The strength of the knife is not too long or too small, which causes the knife to spring.

2. Improper operation by the operator.

3. Uneven cutting allowance (eg 0.5 on the side of the curved surface and 0.15 on the bottom)

4. Improper cutting parameters (such as: too large tolerance, SF setting too fast, etc.)

improve:

1. Use the knife principle: can be big or small, short or long.

2. Add a corner cleaning program, leaving the remaining amount as uniform as possible (the remaining amount on the side and the bottom should be consistent).

3. Reasonably adjust the cutting parameters and round the corners with large margins.

4. Using the SF function of the machine tool, the operator fine-tunes the speed to achieve the best effect of machine tool cutting.

Second, the problem of division

the reason:

1. Inaccurate manual operation.

2. There are burrs around the mold.

3. The center rod is magnetic.

4. The four sides of the mold are not vertical.

improve:

1. Manual operation should be carefully checked repeatedly, and the division should be at the same point and the same height.

2. Use a stone or file to remove the burr around the mold, wipe it with a rag, and confirm by hand.

3. Before decentralizing the mold, demagnetize the centrifugal rod (ceramic centrifugal rod or other).

4. Calibrate and check whether the four sides of the mold are vertical (the verticality error needs to be compared with the fitter's review plan).

Third, the knife problem

the reason:

1. Inaccurate manual operation.

2. The tool is clamped incorrectly.

3. The blade on the flying knife is wrong (the flying knife itself has a certain error).

4. There is an error between the R knife, the flat knife and the flying knife.

improve:

1. Manual operation should be checked carefully repeatedly, and the knife setting should be at the same point as much as possible.

2. Use a blow gun or a rag to clean the tool when clamping.

3. When the blade on the flying knife needs to measure the shank and light bottom surface, one blade can be used.

4. Separate a tool setting procedure to avoid errors between the R knife and the flat knife.

Collision-Programming

the reason:

1. The safety height is insufficient or not set (the knife or chuck hit the workpiece during rapid feed G00).

2. The tool on the program list and the actual program tool are incorrectly written.

3. The tool length (edge length) on the program list and the actual machining depth are incorrectly written.

4. The depth Z-axis access and the actual Z-axis access on the program list are incorrectly written.

5. The coordinates are set incorrectly during programming.

improve:

1. Accurate measurement of the height of the workpiece also ensures that the safe height is above the workpiece.

2. The tool on the program list must be consistent with the actual program tool (try to use the automatic program list or the picture to show the program list).

3. Measure the actual depth of machining on the workpiece, write clearly the tool length and cutting edge length on the program list (generally the tool holder length is 2-3MM higher than the workpiece, and the cutting edge length is 0.5-1.0MM).

4. Take the actual Z-axis number on the workpiece and write it clearly on the program list. (This operation is generally written manually and checked repeatedly).

V. Collider-Operator

the reason:

1. Depth Z axis tool setting error.

2. The number of hits and operations are incorrect (such as: single-sided access without a feed radius, etc.)

3. Use the wrong knife (eg D4 knife and D10 knife for processing).

4. The program goes wrong (eg A7.NC goes A9.NC).

5. The handwheel is turned in the wrong direction during manual operation.

6. Press the wrong direction during manual rapid feed (for example: -X press + X).

improve:

1. For Z-axis tool setting, pay attention to where the tool setting is. (Bottom, top, analysis, etc.).

2. Repeat the check after the number of hits and operations are completed.

3. When setting up the tool, repeatedly check it with the program list and program before loading.

4. The program should go in order one by one.

5. When using manual operation, the operator should strengthen the proficiency of the machine.

6. In manual rapid movement, you can first raise the Z axis to the workpiece and move.

Surface accuracy

the reason:

1. The cutting parameters are unreasonable, and the surface of the workpiece surface is rough.

2. The cutting edge of the tool is not sharp.

3. The tool clamping is too long, and the cutting edge is too long.

4. Chip removal, air blowing, and oil flushing are not good.

5. Program the feed mode, (you can consider feed milling as far as possible).

6. The workpiece has burrs.

improve:

1. The cutting parameters, tolerances, allowances, and speed feed settings should be reasonable.

2. The tool requires the operator to check from time to time and change it from time to time.

3. The operator is required to clamp the tool as short as possible when setting the tool, and the blade should not be too long.

4. For the cutting of flat knife, R knife, round nose knife, the speed feed setting should be reasonable.

5. The workpiece has burrs: it is directly related to our machine tools, cutting tools, and cutting methods. So we need to understand the performance of the machine tool, and make up for the burr side.

Seven, collapse

Causes and improvements:

Feed too fast

-Slow down to a suitable feed rate

2. Feed is too fast at the start of cutting

-Slow down the feed rate at the start of cutting

3. Clamped loose (tool)

--Clamp

4. Clamped (workpiece)

--Clamp

5. Insufficient rigidity (tool)

-Use the shortest allowable knife, deepen the shank clamp, and try down milling

6. The cutting edge of the tool is too sharp

-Change the fragile cutting edge angle, once

7. Insufficient rigidity of machine tool and tool holder

--Use rigid machine tools and tool holders

Wear

Causes and improvements:

Machine speed is too fast

-Slow down, add enough coolant

Hardened material

-Use advanced tools and tool materials to increase surface treatment

3. Chip adhesion

-Change the feed rate, chip size or clean the chip with cooling oil or air gun

4. Improper feed speed (too low)

--Increase the feed speed and try down milling

5. Improper cutting angle

-Change to the appropriate cutting angle

6. The back angle of the cutter is too small

-Change to a larger back angle

Nine, destruction

Causes and improvements:

Feed too fast

-Slow down the feed rate

2. The cutting amount is too large

-Use a smaller cutting amount per edge

3. The blade length and total length are too large

--Deeper the shank clamp, use a short knife to try down milling

4. Wear too much

-Regrind in the beginning

Ten, chatter marks

Causes and improvements:

Feed and cutting speed is too fast

-Corrected feed and cutting speed

2. Insufficient rigidity (machine tool and tool holder)

-Use better machine tools and tool holders or change cutting conditions

3. Back angle is too large

-Change to a smaller rake angle and machine the blade (grind the blade once with a stone)

4. Clamped loose

--Clamp the workpiece

◆ Consider speed and feed

The relationship between the three factors of speed, feed and cutting depth is the most important factor determining the cutting effect. Improper feed and speed often lead to reduced production, poor workpiece quality, and large tool damage.

Use the low speed range for:

  • High hardness material
  • Wayward material
  • Hard-to-cut materials
  • Heavy cutting
  • Minimal tool wear
  • Longest tool life

Use high speed range for

  • Soft material
  • Better surface quality
  • Small tool outer diameter
  • Light cutting
  • Brittle parts
  • Manual operation
  • Maximum processing efficiency
  • Non-metallic materials

Use high feed for

  • Heavy and rough cutting
  • Rigid structure
  • Easy processing materials
  • Roughing tool
  • Plane cutting
  • Low tensile strength material
  • Coarse tooth milling cutter
  • Light machining, fine cutting
  • Brittle structure
  • Difficult to process
  • Small tool
  • Deep vertical groove processing
  • High tensile strength material
  • Finishing tools