CNC machine tool machining center adjustment test - Database & Sql Blog Articles

Programmable Package SG-8018CA(SG7050C) 0.67M~170M

Test probe P100-B can be customized for other specifications

one. Commissioning of CNC machine tool machining center The purpose of CNC machine tool debugging is to check whether the machine tool installation is stable, and whether the transmission, operation, control and other systems are normal and sensitive.

Try to run the test as follows:

â—† Add a lubrication point according to the requirements of the manual, fill the hydraulic oil tank with the required hydraulic oil, and turn on the air source.

â—†Power-on, each component is powered separately or after each component is energized and tested, and then fully powered. Observe whether each component has an alarm, whether the manual parts are observed normally, and whether each safety device is functioning. Even the various parts of the machine can be operated and moved.

â—† Grouting, after the initial operation of the machine tool, coarsely adjust the geometrical accuracy of the machine tool, and adjust the relative position of the main moving parts and the main unit that have been disassembled. The robot, the tool magazine, the exchange workbench, the position, etc. After these tasks are completed, the anchor bolts of the main engine and each accessory can be filled with quick-drying cement to fill the reserved holes of the surrounding bolts.

â—† Debug, prepare various testing tools, such as precision level, standard square ruler, parallel square tube, etc.

â—† Finely adjust the level of the machine tool so that the geometrical accuracy of the machine tool reaches the allowable error range. The multi-point pad support is used to adjust the bed to a level in a free state to ensure the stability of the bed after adjustment.

â—†Adjust the position of the manipulator relative to the main shaft by manual operation, and use the adjustment mandrel. When installing the maximum weight tool holder, it is necessary to perform automatic exchange of the tool magazine to the spindle position multiple times to ensure accuracy and no impact.

â—† Move the workbench to the exchange position, adjust the relative position of the pallet station and the exchange workbench, achieve the smooth work of the automatic exchange of the workbench, install the maximum load of the workbench, and perform multiple exchanges.

â—† Check whether the setting parameters of the CNC system and the programmable controller plc device meet the specified data in the random data, and then test the main operation functions, safety measures, and execution of common instructions.

â—† Check the working condition of the accessories, such as the lighting of the machine tool, the cooling shield, and various guard plates.

After the installation and commissioning of a machining center, due to its many functions, after installation, it can be automatically operated under a certain load for a long time, and the function of the machine tool is comprehensive and stable. The running time can be continuously operated for 2 to 3 days every day for 8 hours or continuously for 1 to 2 days every 24 hours. The continuous operation can use the test program.
two. The acceptance of the CNC machining center is the acceptance of a complex inspection technology. It includes the comprehensive performance test of the machine, electricity, liquid and gas parts of the machine tool and the static and dynamic precision detection of the machine tool. There is a special institution in China, namely the National Machine Tool Product Quality Testing Center. The user's acceptance work can be carried out according to the agency's acceptance method, or the above agencies can be invited to accept. Mainly concentrated in two aspects:

1. Machining center geometric accuracy check

The geometric accuracy of the machining center is the geometry error after assembly. The inspection contents are as follows:

o Flatness of the workbench

o The mutual perpendicularity of each coordinate direction

o Parallelism of the old work surface in the X-axis direction

o The parallelism of the old work surface in the Y-axis direction

o Parallelism of the X-axis direction to the side of the upper and lower grooves of the table

o Axial tilting of the spindle

o Radial runout of the spindle hole

o The parallelism of the spindle head in the Z coordinate direction to the spindle axis

o Verticality of the spindle rotary axis to the work surface

o Straightness of the headstock moving in the Z coordinate direction

Commonly used testing tools are: precision level, square, precision square box, flat ruler, parallel light pipe, dial gauge or micrometer, high precision spindle mandrel and rigid dial indicator. Each geometric accuracy is tested in accordance with the acceptance criteria of the machining center. Note: The level of the inspection tool must be one level higher than the geometric accuracy measured. At the same time, it must be carried out in a state where the machine is slightly warmed up. After the machine is energized, the spindle is rotated at a medium speed for 15 minutes before testing.

2. Machine performance acceptance

The test items specified in the General Rules for Experimental Specifications for Metal Cutting Machine Tools are as follows:

Pilot projects

Reliability, dry running, vibration, thermal deformation, static stiffness

Vibration resistance cutting noise excitation positioning accuracy

Spindle rotation precision linear motion unevenness machining accuracy



High-precision testing instruments are required for comprehensive performance testing of machine tools. In the specific machine tool acceptance, the acceptance content can be carried out according to machine tool factory standards and industry standards.

Machining center operation points

As a skilled operator, it is necessary to understand the requirements of the machined parts, the process route, and the machine characteristics before operating the machine to complete various machining tasks. Therefore, sort out several operational points for reference:

â—† In order to simplify positioning and safety, each positioning surface of the fixture should have an accurate coordinate size with respect to the machining origin of the machining center.

â—†To ensure the consistency of the part mounting orientation and the selected workpiece coordinate system and machine coordinate system in the programming, and orientation installation.

â—† It can be disassembled in a short time and changed into a fixture suitable for new workpieces. Since the auxiliary time of the machining center has been compressed to a short extent, the loading and unloading of the supporting jig cannot take up too much time.

â—† The fixture should have as few components as possible and high stiffness.

â—† The fixture should be as open as possible. The position of the clamping element can be low or low, and the mounting fixture cannot interfere with the tool path of the step.

â—† It is guaranteed that the processing content of the workpiece is completed within the stroke range of the spindle.

â—† For machining centers with interactive worktables, the fixture design must prevent space interference between the fixture and the machine tool due to movement, lifting, lowering, and rotation of the table.

â—† Try to complete all processing contents in one setup. When it is necessary to change the clamping point, special care must be taken not to damage the positioning accuracy due to the replacement of the clamping point, if necessary in the process documentation.

◆The bottom surface of the fixture is in contact with the workbench. The flatness of the bottom surface of the fixture must be within 0.01-0.02mm, and the surface roughness is not greater than Ra3.2μm.