If the common general machining centers and long-term CNC lathes are not updated, and only new CNC lathes are purchased, it will increase the cost of machinery and equipment at many manufacturers. Therefore, it is the only way for manufacturers to carry out the renewal and transformation of CNC machine tools for general machining centers and long-term CNC lathes.
Because the development of CNC machine tool upgrades is complicated and chaotic for manufacturers of retrofits, but how to carry out quality management on the retrofitted CNC lathes has always been a difficult problem that people must discuss. Let me talk about how to carry out the retrofit of CNC Lathe quality management.
The CNC machine tool update and transformation of the general machining center is divided into the new phone update and the second mobile phone update. The new phone update is the general machining center or general milling machine (refer to the CNC lathe with only the bedroom bed box and the vertical and horizontal slide rails) In accordance with its regulations, manufacturers of renewal and transformation carry out renewal and transformation of CNC machine tools. Second, the mobile phone update means that the customer will renovate the general machining center or CNC lathe that has already been applied and carry out the CNC machine tool update. Among them, the second mobile phone update includes the maintenance of CNC lathes and the customer's second mobile phone components. Here again, the quality control measures, main reference points and the entire inspection process of the CNC lathe at the mechanical equipment level will be discussed.
1 The new mobile phone update and transformation and the second mobile phone repair CNC lathe update and transformation must go through the same update and transformation
(1) Removal of X-axis, Z-axis screw, rolling bearing, and motor.
(2) Lift the electric tool post and spindle bearing servo motor.
(3) Lift the radial motor drive equipment, limit switches that limit the operation overtravel, modify the soft starter (customer must) and part of the electrical equipment required for production, processing and safety.
(4) X-axis and Z-axis ball screw on both sides of the supporting plate surface scraping, ball screw auxiliary fixing bracket and bed saddle matching, bed body and bed saddle slide rail pair matching.
(5) It is necessary to upgrade the safety protection equipment, such as the protective cover of the ball screw in each direction, the safety guard door, and the safety device of the limit switch.
2 The difference between the new mobile phone update and the second mobile phone repair CNC lathe update
(1) The part of the main shaft bearing and the lathe tool post that has not been modified for the new mobile phone has not been modified. The part of the main shaft bearing and the part of the lathe tool post does not need to be updated.
(2) Two mobile phone repair CNC lathes have been damaged due to long-term application. In order to ensure that they can be used again for a long time without deformation after maintenance, they must go through the heat treatment process, and then grind the slide, and ensure that the slide Rail strength ≥ HRC47.
(3) Second mobile phone repair CNC lathe should be based on customer must be part of the main shaft bearing and lathe tool holder part of the renovation and adjustment.
3. New mobile phone update and maintenance The precision test of the CNC lathe update and reform is the key new item of the test. The precision test implements JB / T8324.1-1996 "Simple CNC Machine Tool Horizontal Lathe Precision".
4 The precision and quality management of the new CNC lathe update and transformation are as follows
(1) Scraping detection. The new CNC lathe has been renovated and has undergone scraping of the supporting plates on both sides of the X-axis and Z-axis ball screws, scraping of the ball screw auxiliary fixing bracket and bed saddle, and bed body and bed saddle rail pair. Wait. A part of the spindle bearing of the CNC lathe and the tool holder of the lathe are not disassembled. The detection methods are as follows: coloring with mutually matching surfaces, fusion with mutually matching surfaces, and relative friction, and then performing shovel scratch level testing on the shoveling surface, and testing the fusion level with a micrometer at the joint, scraping research The point should not be less than 6 points / 25 * 25mm, 0.03mm micrometer plug at the junction, do not enter.
(2) Flatness detection of ball screw and slide rail: When assembling the ball screw on the assembly line, the flatness of the ball screw and slide rail must be ≤0.02mm.
(3) The parallelism of the slide rail in the vertical plan of the G1 item of precision testing (only convex) should be carried out by the general lathe manufacturers to ensure that the lazy government focuses on testing new items.
(4) The precision of G4, G5 and G6 part of the spindle bearings in precision testing should also be carried out by general lathe manufacturers to ensure that new items are the top priority of lazy government.
(5) The two top-level equal height to width ratios of the G11 bedroom bed and the lathe tool holder are carried out by general lathe manufacturers to ensure that the lazy government renews and reforms the construction of key manufacturers' quality management projects.
5Precision testing of customer repair CNC lathes' renewal and transformationBecause the grinding slide has been carried out, the reference point has changed, so all new projects in the precision testing must be tested, and the operation should be strictly carried out to ensure the performance of the renewal and transformation index.
6 Maintenance of CNC lathes and other new quality key points of reference
(1) Rust check: each horizontal and vertical slide rail surface, main shaft bearing, main shaft bearing flange, hollow sleeve of lathe tool holder.
(2) Anti-corrosion treatment measures must be adopted for the exposed non-paint surface. For example, after cleaning and cleaning, use anti-rust treatment to check: the scraping surface, ball screw and rolling bearing must be clean and tidy before the assembly line is launched. Red powder, iron shaving and other dirty chemicals are produced; there is no dust and dirt on the inside of the switch box and the inside of the protective cover.
(3) Leakage inspection: the spindle bearings and transmission gears of the machine tools for maintenance and repair of CNC lathes must be kept moisturized, and the radial ball screws and rolling bearings for maintenance and repair of CNC lathes and new CNC lathes must be moisturized. Refrigeration equipment, and at the interface between the left and right humidification and refrigeration, there must be no water leakage at the oil, water storage tank, etc.
(4) Numerical control lathe noise, temperature, speed ratio, aviation parts transfer experiment:
①The main shaft bearing continues to rotate the aviation parts for 4 minutes at various speed ratios, in which the maximum speed ratio running time is not less than 2 hours. The empty operation time of the whole equipment is ≥16h, and the simulation of empty operation experiments is carried out on the milling of circular systems such as arcs, external threads, internal holes, internal holes and other milling systems.
②After the temperature of the spindle bearing of the machine tool is stable, measure the temperature of the rolling bearing and the temperature roller bearing: temperature ≤70 ℃, temperature ≤40 ℃; rolling bearing: temperature ≤60 ℃, temperature ≤30 ℃.
③ The noise sound pressure level of the CNC lathe is ≤83dB (A) under the standard of aviation parts, and the CNC lathe has all the normal barking and impact sounds. The fitness movements of the axes in each axis should be stable without significant vibration, shaking and crawling.
â‘£Continuous flight parts transfer experiment of CNC lathes No problem during the continuous flight parts transfer time, reliable operation and stable.
(5) Renovation and replacement of customer's replacement parts (including part of the maintenance of CNC lathes): Because there are many new projects for the replacement and replacement of CNC lathes, the key is to replace and replace the machine tool spindle bearings, radial ball screws, and radial motors , Radial rolling bearings and system software.
â‘ Removal of the machine tool spindle bearing: Because the replacement of the machine tool spindle bearing is to ensure the precision of the production and processing of the inner hole and the inner hole, it is necessary to give priority to the detection of the noise of the spindle bearing after removing the rolling bearing. The noise sound pressure level cannot exceed 83dB (A), and then the precision of production and processing is carried out, and the roughness of the steel parts produced and processed is tested.
â‘¡Detection and replacement of radial ball screw detection: the precision of each part is detected to ensure that within the required range, the operation of the treadmill can achieve radial operation without any normal impact sound and noise. Disassembly and replacement of radial motors: Because other new projects have not been renovated, the test only detects the noise of the running machine, and the radial operation can be all normal impact sounds and noises. Check the radial reverse direction gap to prevent the reverse direction error caused by the assembly line in the assembly line does not meet the requirements.
â‘¢Removal and replacement of radial rolling bearings: For the condition of removal and replacement of radial rolling bearings, it is necessary to ensure that the radial reverse direction error is specified, and check all normal noises.
â‘£Detection and replacement system software detection: The condition of the replacement and replacement system software only detects the function of the system software, detects whether the system software has an alarm condition, and additionally checks whether the trial run external thread is normal (for CNC lathes with servo motors) .
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