GB/T 23567.2-2018 English PDFUS$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 23567.2-2018: Reliability evaluation for numerical control machine tools -- Part 2: Machining centres Status: Valid
Basic dataStandard ID: GB/T 23567.2-2018 (GB/T23567.2-2018)Description (Translated English): Reliability evaluation for numerical control machine tools -- Part 2: Machining centres Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J50 Classification of International Standard: 25.040.20 Word Count Estimation: 18,194 Date of Issue: 2018-05-14 Date of Implementation: 2019-02-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 23567.2-2018: Reliability evaluation for numerical control machine tools -- Part 2: Machining centres---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Reliability evaluation for numerical control machine tools--Part 2. Machining centres ICS 25.040.20 J50 National Standards of People's Republic of China CNC machine tool reliability assessment Part 2. Machining Center Part 2. Machiningcentres Published on.2018-07-13 Implementation of.2019-02-01 State market supervision and administration China National Standardization Administration issued ContentForeword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test method 3 5 Test requirements 4 6 Test method 5 7 Data collection and recording 7 8 Reliability Assessment 7 Appendix A (informative) Reliability Test Record 9 Appendix B (normative appendix) Reliability factor k and number of failures rs 14ForewordGB/T 23567 "Reliability Evaluation of CNC Machine Tools" is divided into the following eight parts. --- Part 1. General; --- Part 2. Machining Center; --- Part 3. CNC lathes and turning centers; --- Part 4. CNC milling machine; ---Part 5. CNC grinding machine; ---Part 6. CNC gear processing machine; ---Part 7. Five-axis linkage machine tool; --- Part 8. Composite processing machine tools. This part is the second part of GB/T 23567. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part was proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Metal Cutting Machines (SAC/TC22). This section drafted by. National Machine Tool Quality Supervision and Inspection Center, Tsinghua University. Drafters of this section. Zhao Qinzhi, Wang Liping, Zhang Wei, Guan Duanyang, Wang Junjian, Chen Ruyan, Li Shulin. CNC machine tool reliability assessment Part 2. Machining Center1 ScopeThis part of GB/T 23567 stipulates that the machining center (hereinafter referred to as the machine tool) is performing reliability verification, measurement, identification and evaluation. Timed test methods, test requirements, test methods, data collection and recording, reliability assessment. This section applies to the reliability verification, measurement, identification and assessment of the machining center products.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 2900.13-2008 Electrotechnical terminology credibility and service quality GB 5226.1-2008 Mechanical electrical safety machinery and electrical equipment - Part 1. General technical conditions GB/T 6477-2008 Metal cutting machine terminology GB/T 18400.1-2010 Inspection conditions for machining centers - Part 1. Geometrical inspection of machine tools with horizontal and additional spindle heads (horizontal Z axis) GB/T 18400.2-2010 Inspection conditions for machining centers - Part 2. Universal or heads Geometric accuracy test (vertical Z axis) GB/T 18400.4-2010 Inspection conditions for machining centers - Part 4. Alignment accuracy and repetitive positioning of linear and rotary axes Degree test GB/T 18400.7-2010 Inspection conditions for machining centers - Part 7. Accuracy testing of finished specimens GB 18568-2001 Processing center safety protection technical conditions GB/T 20957.1-2007 Inspection conditions for precision machining centers - Part 1 Test (horizontal Z axis) GB/T 20957.2-2007 Precision machining centres - Test conditions - Part 2. Vertical or universal spindle heads with vertical main rotary Machine geometry accuracy test (vertical Z axis) GB/T 20957.4-2007 Inspection conditions for precision machining centers - Part 4. Positioning accuracy and repeatability of linear and rotary axes Bit accuracy test GB/T 20957.7-2007 Inspection conditions for precision machining centers - Part 7 GB/T 21012-2007 Precision Machining Center Technical Conditions GB/T 23567.1-2009 Reliability assessment for CNC machine tools - Part 1. General JB/T 8801-2017 Processing Center Technical Conditions JB/T 10793.1-2007 High-precision machining centers - Part 1. Accuracy testing for horizontal machine tools JB/T 10793.2-2007 High-precision machining centers - Part 2. Accuracy testing of vertical machine tools JB/T 10793.3-2017 High-precision machining center Part 3. Technical conditions3 Terms and definitionsGB/T 2900.13-2008, GB/T 6477-2008, GB/T 23567.1-2009 and the following terms and definitions apply to this file. For ease of use, some of the terms and definitions in GB/T 2900.13-2008 and GB/T 6477-2008 are repeated below. 3.1 Machining center machiningcenters, NCmachinetoolswithautomatictoolchanger It is a CNC machine tool. The spindle is usually horizontal or vertical and has two or more machining methods (such as milling, boring, Drilling), through the machining program, automatic tool change from a magazine or similar storage unit. The machine can also be artificial within a certain range. control. [GB/T 6477-2008, definition 2.1.28] 3.2 Failure failure The ability of the product to complete the required function is interrupted. Note 1. After failure, the product is in a fault state. Note 2. The difference between “failure” and “fault” is that the failure is an event and the failure is a state. Note 3. The “failure” defined here does not apply to products consisting only of software. [GB/T 2900.13-2008, definition 191-04-01] 3.3 Design failure designfault Failure caused by improper product design. [GB/T 2900.13-2008, definition 191-05-09] 3.4 Manufacturing fault manufacturingfault Failure due to failure to manufacture the product in accordance with the design or specified process. [GB/T 2900.13-2008, definition 191-05-10] 3.5 Intermittent fault Appears for a limited period of time, and subsequent failure of the product to restore the required function without any repairs. Note. This type of fault is often reproduced. [GB/T 2900.13-2008, definition 191-05-17] 3.6 Failure mode faultmode One of the possible states of a faulty product for a given requested function. [GB/T 2900.13-2008, definition 191-05-22] 3.7 Fault recognition faultrecognition Identify faulty events. [GB/T 2900.13-2008, definition 191-07-20] 3.8 Failure cause failurecause Factors that cause failure during design, manufacture, or use. [GB/T 2900.13-2008, definition 191-04-17] 3.9 Failure mechanism failuremechanism A physical, chemical, or other process that causes failure. [GB/T 2900.13-2008, definition 191-04-18] 3.10 Conformity test compliance test A test indicating whether a certain characteristic or a certain property of a product meets the stated requirements. [GB/T 2900.13-2008, definition 191-14-02] 3.11 Simulation field test simulationfieldtest Compliance tests or test tests performed under specified and controlled conditions (with or without simulating actual field conditions). Note. Rewrite GB/T 2900.13-2008, definition 191-14-04. 3.12 Tracking statistics field test trackingofstatisticalfieldtest Compliance testing or testing conducted by tracking and statistical methods at the user site where work, environment, maintenance and measurement conditions are recorded Test. Note. Rewrite GB/T 2900.13-2008, define 191-14-05. 3.13 Quick test quicktest In order to shorten the controllability test process, under the working mechanism of the machine tool and the safety margin, the applied load level exceeds the normal work of the machine tool. Do a horizontal test.4 test method4.1 Test plan 4.1.1 Test selection The machine reliability test method, the simulation field test and the tracking and field test are optional. 4.1.2 Simulation field test For newly developed and newer machine tools, a simulated field test with no replacement timing censoring test should be used. Simulated field test Should be a continuous reliability test. 4.1.3 Tracking Statistics Field Test For mass-produced machine tools, time-crunting or fixed-crunch tracking statistical field tests should be used. 4.1.4 Retesting If the test is stopped midway through various reasons, the test should be repeated. 4.2 Timing Censoring Test Time 4.2.1 Simulated field test in a fast mode, the cumulative test time of each sample machine is T≥200h. Note. For non-quick tests, the cut-off time can be determined based on the machine's daily work shift and the purpose of the test. 4.2.2 The tracking and statistical field test is adopted, and the cumulative test time of each sample machine is T≥2000h. 4.3 Censoring test The requirements for the end of the test using the censored method are in accordance with relevant regulations.5 Test requirements5.1 Test environment Room temperature. 5.2 Pre-test 5.2.1 Before the test, the machine tool shall be pre-inspected according to the requirements of the instruction manual or technical documents. After the machine has passed the pre-inspection, it can be carried out. Rely on sex test. 5.2.2 Prior to the test, special handling of any quality aspects of the machine tool is not permitted. 5.3 Test equipment and instruments 5.3.1 The reliability test device used shall be safe and reliable and shall meet the test requirements. 5.3.2 The measuring instrument used shall be calibrated and within the calibration period. 5.4 Simulated field test 5.4.1 The actual working conditions of the machine tool should be simulated as much as possible. 5.4.2 The lubrication, cooling and other systems of the machine tool should be in normal working condition. 5.4.3 The test device should be placed in the middle of the workbench as much as possible and should be firm and reliable. 5.4.4 The toolies with the heaviest, longest and largest diameters should be installed in the tool magazine. 5.4.5 The test load spectrum and working condition spectrum shall be prepared according to the characteristics of the test machine. 5.4.6 When using a rapid test, the working principle of the machine tool, as well as the failure and failure mechanism should not be changed. 5.5 Tracking Statistics Field Test 5.5.1 The operating conditions of the machine tool shall be representative and conform to the product design or specification. 5.5.2 The selected prototype should be as similar as possible under similar operating conditions. 5.5.3 The machine tool shall be subjected to an early failure screening test. 5.5.4 All test machines shall have identification numbers. 5.6 Preventive maintenance Normal preventive maintenance (if necessary replacement, adjustment, lubrication, etc.) is permitted during the test. 5.7 Failure Determination and Counting Principles 5.7.1 The principle of fault determination shall be in accordance with 4.1 of GB/T 23567.1-2009. 5.7.2 The counting principle of faults shall be in accordance with 4.2 of GB/T 23567.1-2009. 5.8 Sampling 5.8.1 The sampling principle shall be in accordance with 5.1 of GB/T 23567.1-2009. 5.8.2 The number of samples is randomly sampled in the product according to the sampling principle. The number of samples is as specified in Table 1. Table 1 The sampling quantity unit is Taiwan Test method Number of samples New product batch product Simulated field test ≥1 ≥2 Field tracking statistical test - Batch products ≤ 50, 5 (less than 5 by the number of units) Batch products >50, for 10 or 5% of annual production, but no more than 206 Test methods6.1 Simulated field test 6.1.1 Test content The test contents of the machine tool simulation field test are shown in Table 2. Table 2 List of machine tool simulation field test Serial number test project test time test description 1 Dry running pre-run test ≥ 24h Dry running simulation test to eliminate early failure 6.1.2.1 2 X-axis loading test ≥ 40h Analog X-axis feed motion (such as milling) loading test 6.1.2.2 3 Y-axis loading test ≥ 40h Simulated Y-axis feed motion (such as milling) loading test 6.1.2.2 4 Z-axis loading test ≥ 40h Simulated Z-axis feed motion (eg drilling) loading test 6.1.2.2 5 Spindle system static stiffness test is used to analyze the reliability of manufacturing and assembly process 6.1.2.3 6 Spindle torque and power loading test ≥ 48h Analog spindle torque and power loading test 6.1.2.4 7 Typical test piece cutting test to verify the accuracy of machining accuracy 6.1.2.5 8 Enhanced air running test ≥24h Mainly assessing tool change action, fast linear motion and spindle height Reliability of speed swing, cooling, chip removal, etc. 6.1.2.69 Safety and reliability testMainly assess safety protection devices, hydraulic clamping devices, limits Reliability of position limiting device 6.1.2.7 10 Machine tool accuracy inspection and inspection The accuracy change of each test stage is 6.1.2.8 6.1.2 Test procedure 6.1.2.1 Dry running test 6.1.2.1.1 CNC machine program according to GB/T 21012-2007, JB/T 8801-2017, JB/T 10793.3-2017 or enterprise Conduct a dry run test. 6.1.2.1.2 The test time for the dry running of the machine tool shall be at least 24h. 6.1.2.1.3 During the test, the coolant should be turned on. 6.1.2.2 Axis loading test 6.1.2.2.1 Under the simulated working state, load tests are performed on the machine X axis, Y axis and Z axis respectively. 6.1.2.2.2 The loading force, loading time and loading frequency shall be in accordance with the provisions of the load spectrum. 6.1.2.2.3 Operating parameters such as spindle speed and feed rate shall be as specified in the operating spectrum. 6.1.2.2.4 The loading time for each axis shall be at least 40h. 6.1.2.3 Static stiffness test of spindle system 6.1.2.3.1 After each axis is loaded, the static stiffness test of the spindle system is carried out. 6.1.2.3.2 Under the simulated working condition, the static stiffness loading test shall be carried out on the machine tool spindle in the three directions of X, Y and Z respectively (see Figure 1). 6.1.2.3.3 The loading force shall not exceed the maximum load specified in the design. 6.1.2.3.4 The loading force in each direction shall be loaded in three gears (light load, medium load, heavy load), and the loading force of each gear shall be repeated three times. 6.1.2.3.5 Record the elastic displacement values of the main shaft in the X-axis, Y-axis and Z-axis directions, draw the corresponding elastic displacement curve, and calculate the main The static stiffness of the shaft at maximum static load. a) X, Y direction b) Z direction Figure 1 Static stiffness test of the spindle system 6.1.2.4 Spindle torque and power loading test 6.1.2.4.1 In the simulated working state, the torque loading test is carried out under the low speed operation of the machine; the power loading is performed under the high speed operation of the machine tool. test. 6.1.2.4.2 Loading force, loading time and loading frequency shall be as specified in the load spectrum. 6.1.2.4.3 Operating parameters such as spindle speed shall be as specified in the operating spectrum. 6.1.2.4.4 Torque loading and power loading time shall be at least 24h respectively. 6.1.2.5 Typical test piece cutting test 6.1.2.5.1 Test piece cutting test. The general machining center shall be in accordance with the provisions of GB/T 18400.7-2010, and the precision machining center shall be in accordance with GB/T 20957.7- According to the regulations of.2007, the high-precision machining center is in accordance with JB/T 10793.1-2007 or JB/T 10793.2-2007, or according to enterprise standards. According to the provisions of the technical specifications, the precision test of the typical test piece is performed on the prototype. 6.1.2.5.2 The number of processed test pieces shall be determined by the tester and the manufacturer in consultation. 6.1.2.6 Enhanced air run test 6.1.2.6.1 Intensify measures based on the content of the dry run test, the setting of the NC program shall include. the spindle adopts medium speed and high speed Turn, increase the rapid movement of components and the high-speed running time of the spindle, increase the injection volume of the cooling liquid, increase the simulated cutting motion, and so on. 6.1.2.6.2 The idle test acceleration test time shall be at least 24h. 6.1.2.7 Safety test 6.1.2.7.1 Carry out relevant safety tests in accordance with the provisions of GB 5226.1-2008 and GB 18568-2001. Generally should include safety equipment Tests such as setting, interlocking devices, control devices, moving parts, tool magazines, automatic exchange devices, and chip removal devices. 6.1.2.7.2 The number of machine tool safety tests shall be at least 20 times, and the functional safety test shall be at least 10 times. The regulations are carried out. 6.1.2.8 Machine tool accuracy test 6.1.2.8.1 Geometric accuracy, positioning accuracy and repeat positioning shall be performed before the test, after each loading test phase, and after the end of the test. Accuracy test. 6.1.2.8.2 Geometric accuracy test. Ordinary machining center according to GB/T 18400.1-2010 or GB/T 18400.2-2010, precision According to GB/T 20957.1-2007 or GB/T 20957.2-2007, the high-precision machining center is according to JB/T 10793.1- The provisions of.2007 or JB/T 10793.2-2007, or according to the standards of enterprises and technical specifications. 6.1.2.8.3 Positioning accuracy and repeat positioning accuracy test. Ordinary machining center according to GB/T 18400.4-2010, precision machining According to the provisions of GB/T 20957.4-2007, the high-precision machining center is in accordance with JB/T 10793.1-2007 or JB/T 10793.2-2007. Set, or according to corporate standards, technical specifications. 6.2 Tracking Statistics Field Test 6.2.1 Generally, on-site tracking should be carried out when the product is put into use. 6.2.2 After the test is stopped, the performance of the prototype and the main safety functions shall be checked.7 Data collection and recording7.1 Simulation field test 7.1.1 The operation of the machine should be checked at any time during the test and recorded (see Table A.1 in Appendix A). Records should be accurate, where changes are made Wherever, there should be a record of the person’s signature and a reason. 7.1.2 In the event of a fault, immediately stop the inspection, the inspector immediately records each fault and fills in the “fault record form” (see Table A.2) and the “Reliability Test Report” (see A.3). 7.1.3 During the test, the replacement of consumables and accessories that have reached the end of their life is not counted, but should be recorded. 7.2 Tracking statistics field test 7.2.1 Machine reliability field tracking test should have at least 2 data collection points. 7.2.2 Data collection may be performed by the tester or the organization user. When collecting data by users, the user should be trained to make the user clear Meaning of meaning, master the method of fault recording, and provide the user with the fault record table and fault analysis report of the machine tool. 7.2.3 The tester should regularly visit the user's site to understand the situation and provide guidance on specific issues, and should record and report the user on a regular or one-time basis. Responsible for recycling and responsible for saving.8 Reliability assessment8.1 Mean Time Between Failure MTBF Estimation 8.1.1 Mean time betw......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 23567.2-2018_English be delivered?Answer: Upon your order, we will start to translate GB/T 23567.2-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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