Debugging and acceptance elements of the machining center
一. Machining center
The purpose of 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 according to the following steps:
Fill the lubrication point according to the requirements of the manual, fill the hydraulic oil tank with the required hydraulic oil, and turn on the air supply.
Power is supplied, and each component is powered separately or after each component is energized and tested, and then fully powered. Observe whether there is any alarm in each component, whether the manual parts are observed normally, and whether the safety devices are working. Even the various parts of the machine can be operated and moved.
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 respective foot bolts.
Commissioning, ready for a variety of testing tools, such as precision level, standard square, parallel square tube.
Fine-tuning the level of the machine tool, so that the geometric accuracy of the machine tool reaches the allowable error range, using multi-point pad support, the bed is leveled in a free state to ensure the stability of the bed after adjustment.
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.
. 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.
Check whether the setting parameters of the numerical control 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.
Check the working condition of the accessories, such as the lighting of the machine, the cooling shield, various guards, etc.
After the installation and commissioning of a machining center, due to its many functions, after installation, it can be operated automatically 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.
二. Processing center acceptance
The acceptance of the machining center is a complex inspection technology work. It includes the comprehensive performance testing of the machine, electricity, liquid and gas parts of the machine tool and the detection of static and dynamic precision 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:
Machining center geometric accuracy check.
The geometric accuracy of the machining center is the geometry error after assembly. The inspection contents are as follows:
The flatness of the workbench.
The mutual perpendicularity of each coordinate direction movement.
The parallelism of the x-axis direction to the work surface.
The parallelism of the work surface is moved in the y-axis direction.
The parallelism of the x-axis direction to the side of the upper and lower grooves of the table.
The axial movement of the spindle.
Radial runout of the spindle bore.
The parallelism of the spindle head in the z-coordinate direction to the spindle axis.
The verticality of the spindle's rotary axis to the work surface.
The 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 measured geometric accuracy. 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.
Machine tool performance acceptance
The test items specified in the General Rules for Experimental Specifications for Metal Cutting Machine Tools are as follows:
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.
Dry running vibration
Spindle rotation accuracy
Linear motion inhomogeneity