First, the need for CNC equipment commissioning and acceptance
CNC machine tools is the foundation of modern manufacturing technology and equipment, with extensive use of CNC machine tools and the popular acceptance of the machine work more and more attention, but many users on the acceptance of CNC machine tools, there are still deviations. The main purpose of testing the new machine is to determine whether the operator Taiwan Jichuang its technical specifications, determine whether the predetermined objectives Jichuang precision machining of parts. In many cases, acceptance of the new machine through a representative of the typical processing of the decision machine parts can be passed acceptance. When the machine is used for special processing of a particular part, this inspection is acceptable. But for more versatile CNC machine tools, cutting parts of the test methods that may not provide clear enough information to accurately determine the overall accuracy of machine tools Branch Pu targets. Only through the geometric accuracy of machine tools and positioning accuracy can be tested, to reflect the manufacture of precision machine itself. In both the accuracy on the basis of inspection, and then the parts processing tests, in order to assess the machining performance. Placed in the production line for the new machine, need to process capability and production by the beat of the examination to judge the machine's ability to work. However, the actual inspection work in the sphere grinding machine, users tend to have a lot of acceptance in the new machine when Du Jing Du ignore the Jianyan of machine tools, Ta Men for the new machine in the factory when Zuoguo survey before installing a simple adjustment to use of the Site Machine level, as long as the trial processing components have passed the test on that machine through acceptance. These users tend to ignore the following aspects:
1, the new machine arrived at the scene by transport links, because the vibration during transport and deformation, the level of benchmark tests with the state of the factory has been completely different, this time with geometric precision machine tool inspection accuracy at the factory bias.
2, even excluding the impact of transport links, the machine will adjust the level of geometric accuracy of the related projects have an impact.
3, the location accuracy of the detection devices such as encoders, grating is mounted directly on the machine screw and bed body, the geometric precision of the adjustment will have some impact on its.
4, obtained by the position accuracy test bias, but also directly by software error compensation of CNC machine tools to adjust in a timely manner, thereby improving the positioning accuracy of machine tools.
5, pressure, temperature, humidity and other external conditions change, will impact on the location accuracy.
6, obtained by the position accuracy test bias, but also directly by software error compensation of CNC machine tools to adjust in a timely manner, thereby improving the positioning accuracy of machine tools.
Only used when testing new machine tools machining parts precision evaluation test method to determine the overall sphere Mochuang quality of the machine, and as the sole criterion Yanshou is not enough to be on the geometric accuracy of machine tools, and working precision for location accuracy comprehensive examination, the only way to ensure that the machine performance, otherwise it will affect the installation and use, resulting in large economic losses.
CNC machine tools to reach users in the side to complete the initial acceptance of debugging, the debugging does not mean the complete end. In the actual production enterprises, often using such a device management method: After installation, the device production process, only the accuracy of processing equipment can not wait until the initial request only when the corresponding debugging downtime. So many companies can not accept the loss of such a suspension, so in their daily work can also be in accordance with the "six degrees of freedom measurement of rapid machine tool error assessment" approach to solve this problem, a significant reduction in test time, ahead of such a small shop can also control the processing process, ultimately leading to zero-failure, and less reliance on ex post checks.
Six degree of freedom measurement of rapid machine tool error assessment methods is to measure the system after an installation, which can measure the accuracy of CNC machine project of six errors, the accuracy with the traditional single-item measurement methods, can greatly shorten the instrument alignment, detection time.
Second, CNC equipment, commissioning and acceptance process
On the acceptance process, the acceptance of CNC machine tools can be divided into two areas:
1, at the manufacturer factory pre-acceptance
The purpose of pre-acceptance inspection is to verify the processing machine can meet the quality and productivity of the user to check information provided by suppliers, spare parts. Its main work includes:
(1) test whether the main parts of machine tools manufactured in accordance with contract requirements.
(2) whether the parameters of the machine to the contract requirements.
(3) test geometry and machine tool positioning accuracy is satisfactory.
(4) The machine is correct for each operation.
(5) part of the contract does not require inspection, if found unsatisfactory Department will propose to the manufacturer for timely improvements.
(6) of the specimen for processing, check whether the required precision.
(7) to do pre-inspection records, including precision tests and requirements for improvement, signed by the manufacturer.
If the pre-acceptance through, it means that the user agrees to the machine tool manufacturers shipped to the user, when the goods arrive at the user, the user will pay most of the amount of the equipment. Therefore, the pre-acceptance is a very important step, not be ignored.
2, in the procurement of equipment side of the final acceptance
Mainly based on the final acceptance certificate on the machine tool factory acceptance criteria specified and the user can provide the actual means of detection, determination of the indicators on the machine certificate. Test results as the original data stored in the machine technology file, for future maintenance of the technical indicators are based.
Whether pre-acceptance or final acceptance, according to GB 9061-1988 "Metal Cutting Machine Tool General" provisions of the standard, testing and acceptance should include the following:
(2) accessories and tool inspection
(3) Test parameters
(4) empty the machine running test
(5) the load test machine
(6) Accuracy of machine tools
(7) experimental work machine
(8) life test machine
Third, the numerical control equipment, commissioning and acceptance of common standards
Commissioning and acceptance of CNC machine tools should follow certain norms, standards of CNC machine tools have a lot of acceptance, usually can be divided into two categories according to their nature, and general class standards and product class standard.
1, General Class Standard
Such standards require that the CNC machine commissioning and acceptance testing methods, the use of measurement tools, the relevant definition of tolerance, machine design, manufacturing, acceptance of the basic requirements. If our standard GB / T 17421.1-1998 "Test code for machine tools Part 1 in the no-load conditions, spherical grinding or finishing Geometric accuracy of machines", GB / T 17421.2-2000 "Test code for machine tools Part 2 positioning numerically controlled axes Repeat positioning accuracy and precision of the determination ", GB / T 17421.4-2003" Test code for machine tools CNC Part 4 round test. " These standards equivalent to ISO 230 standard.
2, the product class standard
Such standards require specific types of machine tool geometric precision and accuracy of test methods, and machine tool manufacturing, and commissioning and acceptance of specific requirements. If China JB / T 8801-1998 "processing center technical conditions", JB / T 8771.1-1998 "Test conditions for machining centers Part 1 first horizontal spindle and with Geometric tests for machines (horizontal Z-axis)", GB / T 18400.6-2001 "Test conditions for machining centers Part 6 feed rate, speed, and interpolation accuracy test" and so on. Specific types of machine tools and related contract shall be referred to the Chinese and foreign standards specific debugging acceptance.
Of course, the actual acceptance process, procurement of equipment, there are many parties in accordance with the standards of the German VDI/DGQ3441 or Japan JIS B6201, JIS B6336, JIS B6338 standard or international standard ISO 230. No matter what kind of criteria need to be very note that different standards of "accuracy" is defined very different acceptance criteria must be cognizant of the accuracy of the various definitions of indicators and calculation methods.
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