There is probably a machining center in our workshop. as much as possible. So, how can we judge the accuracy of a machining center? Let’s talk about 4 aspects below.
1. Positioning central vertical machining samples:
The sample must be located in the middle of the X race and placed along the Y and Z axes at appropriate positions adapted to the positioning of the sample and lighting and tool lengths. When there are specific requirements for the positioning position of the sample, it must be stipulated in the agreement between the manufacturer and the user.
2. Specimens fixing:
The sample should be easily installed on special lights to obtain maximum stability of the tool and the lighting. The mounting surfaces of lighting and samples must be straight.
The parallelism between the mounting surface of the sample and the tightening surface of the luminaire must be checked. Appropriate tightening methods should be used so that the tool can penetrate and make the entire length of the central hole. It is recommended to use counterparties to repair the sample to avoid interference between the tool and the screw. The total height of the sample depends on the selected fixed method.
3. Materials, tools and sample cutting:
The materials, cutting tools and sample cutting parameters are selected according to the agreement between the manufacturer and the user, and must be saved.
1) The cutting speed: the cast iron parts are approximately 50 m / min; Aluminum parts are around 300 m / min.
2) Power supply: approximately (0.05 ~ 0.10) mm / braid.
3) Cutting depth: The radial cutting depth of all the grinding processes must be 0.2 mm.
4. Sample size:
If the sample is cut several times, the external dimensions are reduced and the openings are increased. Precision of the machining center. The samples can be used several times in cutting tests, and their specifications must be kept at less than 10% of the characteristic size given in this standard. When the test part is used again, a thin layer cut should be performed before performing a new fine cutting test to clean all the surfaces, then test.
I guess you will encounter another problem when using the machining center. Have we bought parallel goods?
The precision of machining of the parts in the machining center is generally due to the fact that the power dynamics between each tree is not adjusted according to the error during installation and adjustment, or chains transmission of each tree of the modification of the machine tool after use (such as as screws and no thread. It can be resolved by the readjustment and the modification of the amount of compensation for differences.
When the dynamic monitoring error is too large and the alarm is called, you can check if the speed of the Servo engine is too high; The output lock and the gain potentiometer are good;
If the machining accuracy is poor when the tooltip exceeds movement, the acceleration and deceleration time may be too short, which can prolong the speed change time; The lead screw is loose or the rigidity is too bad, which can reduce the position appropriately. . A clarification of positioning of the mediocre axis or poor compensation for the screw space will cause roundness errors during the passage of the quadrant.
It turns out that there is so much knowledge of the precision of the tool-machine.
But there is another saying among people: high precision is guaranteed by people. It is said that machine tools with the greatest precision of treatment in the world are calibrated by people. According to this declaration, it is possible to use relatively less precise parts to assemble machine tools with incredible machining precision.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
