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the cnc laser: accuracy and repeatability are among its outstanding values; smoother travel and controlled acceleration and deceleration need to be developed.

by:QUESTT     2020-07-09
The operation of the CNC laser is the same as that of any other CNC system, with a few exceptions.
Material, thickness and operations to be carried out (
Cutting, welding, marking, etc)
In order to program the correct feed speed and power, it must be considered (
Current, frequency and pulse rate)of the laser.
The laser must also focus and determine the tool length offset before starting the program.
Programming is similar to programming in other systems.
The program includes commands such as turning off and turning on the laser, turning off and turning on the gas.
The size, hole position, etc. are then converted into a language that the computer can understand.
The program is entered into CNC and stored.
The operator places the workpiece of the laser in the fixture, selects the program, and starts the operation.
The advantages of CNC laser choose CNC laser for many reasons.
By implementing fixtures to protect parts and programs, parts can be completely repeated over and over again.
This ensures the production of parts of the same quality, whether heat treatment, cutting or marking.
The process is also efficient.
Since the laser is run by the program, the operator has time to perform other tasks.
When a piece is being baked, the operator can prepare the next piece.
After the process is completed, the operator removes the finished part, locks the next piece to be laser in the fixture, starts the program, verifies the quality of the previous piece, and prepares the next article for lasing.
Repeating this program can save time and money.
The CNC laser provides continuous travel speed when tracking the line.
This constant rate produces a more uniform weld.
However, the accuracy of the CNC laser is perhaps the most impressive feature of it.
CNC laser can produce the number of final parts that are accurate to less than 0.
001 of programming size.
This level of precision provides an opportunity for major improvements in many industry areas.
One of the areas is mold manufacturing. Laser-
Laminated molds are produced by using a fixed fixture, several pieces of metal and a program.
The hole positions cut on each plate are exactly the same.
After cutting all the parts, align the plate by pushing the pin into the laser hole.
These plates are combined to form a mold section.
The parts cut from the board are aligned in a similar way and placed on the mold shoe according to the position of the mold cavity.
This piece becomes a punch card.
As shown in Figure 1, an example of a laser laminated mold.
The tight fit between the punch and the mold, as well as the same size for each cut, produces a high quality product. The laser-
Laminated molds also have certain cost advantages. By using cold-rolled steel (about 30^/lb)
Replace tool steel (about $5. 50/lb)for the back-
You can achieve great savings.
Figure 2 shows the status of the punching board after stamping 3000 pcs.
The first two boards are 0. 125 tool steel;
Six spare plates are cold. rolled steel.
Due to the cutting effect of laser heating-
Handle edge edges and no subsequent heat treatment is required.
Smooth and precise cutting also eliminates the grinding process, which is one of the main costs of traditional mold manufacturing.
All in all, laser-
The cost of laminated molds is about 1 out of 4 of the price of similar toolssteel die. Built-
CNC with various built-in functions
In the function of simplifying cumbersome operations.
One of them is the \"convert\" function that can zoom in or out the size of the programming piece.
This conversion can be done by simply inserting a statement.
Generating the same result on a system without this feature requires modifying the entire program.
Another time-saving feature is to select between absolute and incremental inputs.
The absolute input is based on X-Y-
Z coordinate system. An origin (0,0,0)
Selected, all points are interpreted as absolute coordinates relative to that origin.
Incremental input is also based on X-Y-
Z coordinate system.
All entries are interpreted as moving commands at the same distance as programming from the current location instead of the absolute point.
Table 1 compares commands that must be programmed in each type of input in order to achieve the same result.
In some cases, using absolute input will prove to be more accurate.
For example, suppose the CNC is read-only to pick up a few parts per thousand (0. 001).
Four circles will be cut out, and the center of the circle is located (1. 00,0), (1. 1004,0), (2. 2008,0)and (2. 3010,0).
Assuming both programs start at the origin, table 2 uses figure 3 to show the steps in each program to reach the center of each circle.
An error of 0.
001 was detected in the incremental process.
If this part needs 51 holes at 0.
1004, the absolute system will be (6. 020,0).
Place the last hole with the same instruction of the incremental system (6. 000,0).
This error of 0.
020 may have bad results.
In some cases, incremental input is time efficient and produces accurate results.
For example, suppose a customer orders a part with eight squares, each of which is 0. 200 apart.
A loop can be built to cut the square and move (0. 200,0).
If the loop is executed eight times, the program is completed.
This program would be much longer if absolute systems were used.
In other cases, incremental input will be an alternative to saving time.
For these reasons, both can be used by CNC programmers.
With the development of research and development, possible improvements will always bring improvements to new products, CNC laser is like this.
As a \"top priority\", the two major revisions stand out.
For many operations, smooth travel that does not stop or slow down at the end of the programming radius or line is necessary.
When programmed to a point, a, the CNC laser on the market today will reach this point, stop, and then turn off the laser.
Before it turned off, the laser stayed at point A for a short time.
This is especially harmful in welding and marking, as lasers tend to burn through the material.
Ideally, the laser should go to point a, reach point A, and stop and close at the same time.
When doing the first cut in the material, occasionally a stay is required.
However, housing should be the choice of programmers.
Since the thickness of a particular part may vary, it may be necessary to accelerate or slow down for cutting with reduced or increased thickness.
For example, using today\'s CNC, as shown in figure 4, it is almost impossible to produce high quality cutting on wedges.
The development of such options and other options will expand the market for lasers by increasing the use of lasers and improving their current applications.
For information about Morton metal process, cycle e3.
Table: Comparison of programming values, absolute input, and incremental input.
Table: the movement required to reach the center of all circles. Photo: 1.
Example of laserlaminated die. Photo: 2.
Condition of punching pressure plate after stamping 3000 pcs. Photo: 3.
The position of the center of the circle, and the distance between them. Photo: 4.
Schematic, good deceleration
Wedge cutting quality.
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