How to improve the reliability of CNC machine tool

2022-08-11
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How to improve the reliability of CNC machine tools

it is well known that the reliability of domestic CNC machine tools can be greatly improved by selecting high-performance and reliable CNC systems, servo drives and high-quality supporting components in the design of machine tools. As the same type of CNC machine tools also use the same type of CNC system, the domestic machine tools have not much difference in accuracy and performance compared with imported CNC machine tools, and they also have certain advantages in after-sales service and price, but their reputation in the eyes of users is different. This is an urgent problem to be solved in front of domestic CNC machine tool manufacturers. The reasons are various, and the key is also the source, that is, the design, service and management level of domestic CNC machine tool manufacturers

the following describes how our company enhances the quality awareness of employees through reliability design in the process of designing and manufacturing multi station CNC modular machine tools, ensures product quality with work quality, improves the reliability of CNC machine tools, provides users with satisfactory and applicable products, and continues to win orders from users

1 demonstrate the feasibility of the product design scheme through process tests

the multi station CNC modular machine tool designed and manufactured by our company is a special machine tool for deep hole machining. On the basis of in-depth understanding of user needs, first of all, a process test was carried out on the key technology involved in user needs - "deep hole processing technology". Through the process test, the feasibility of the product design scheme was demonstrated to ensure that the designed products can meet user needs

2 adopt modular parts with mature technology

the structural design of multi station CNC modular machine tool adopts the modular pressure experimental machine verified by our company through mass production. The performance and basic parameters of the machine are blocky parts with certain differences, such as the CNC slide table with linear rolling guide, small drilling power head, high-precision CNC turntable, etc

3 summarize experience and lessons

analyze the quality information fed back by the previous production of modular machine tools and after-sales service, and put forward improvement requirements for problems such as machine tool protection, wiring and appearance

4 select high-quality control system and parts

select high-performance and high reliability CNC system, servo drive device, supporting functional components, electrical components and detection components for the machine tool to ensure the reliability of the machine tool

the CNC system of the machine tool adopts the powermate-d motion controller of FANUC company in Japan, which has the function of two axis control, and can also control an analog/digital spindle. The two servo axes can be configured in one channel or two channels respectively. The system has an integrated PLC, which can connect up to 16 powermate-d motion controllers through fanuci/olink serial data transmission bus. Multiple motion controllers can share a crt/mdi display. These characteristics make the distributed control system composed of the motion controller have good scalability, especially suitable for all kinds of multi position NC machine tools with different work positions

the servo drive device is equipped with fanuca series digital AC servo system. The closed-loop position detection element of high-precision CNC turntable adopts the circular grating produced by German Heidenhain company

5 correctly use the functions of CNC system

in the application of high-performance CNC system, due to incorrect parameter settings and unreasonable logic control program, CNC machine tools often leave the factory with problems, and problems are found when users use them, affecting the reputation of products. For example, when applying the pitch error compensation function of the system to correct the positioning accuracy of the NC turntable, incorrect parameter settings will make the turntable rotate and position in the same direction, but bring more and more errors; Incorrect acceleration and deceleration time constant setting will cause an impact on the machine to build a complete refining PX PTA polyester differential fiber industrial chain bed transmission mechanism

the macro function B of the application system realizes parametric programming and simplifies operation

according to the process characteristics of deep hole machining, the macro function B of the system is applied to realize parametric programming, so that users only need to modify the corresponding process parameters (total processing length, number of times occupied by grading, feed speed, feed length, etc.) on the corresponding screen when using, so that operators who do not understand NC programming can operate the machine tool. In addition, the workpiece number retrieval function of the application system enables the machine tool to select the corresponding processing program through the selection switch when processing different parts

6 carefully design the logic control program and enhance the diagnostic function

pay attention to the design of the logic control program of the NC machine tool. In addition to carefully designing the necessary logic control program and safety interlock function of the machine tool, it also applies the information function and alarm function of the system PLC, designs the necessary operation prompt and diagnostic information, and enhances the diagnostic function of the NC machine tool, It is convenient to guide the user to operate the operation panel of the friction and wear tester for introduction and maintenance

7 meticulous manufacturing and strict assessment

the company's leaders attach importance to employee education. All employees use work quality to ensure product quality, strictly abide by process specifications, and adhere to the assessment of 100h continuous operation of CNC machine tools. The speed of assessment operation is based on the productivity required by users. In the on-line debugging of CNC machine tools, it is worth exploring the demand potential of FANUC rare earth nano materials. The servo diagnosis function of CNC system can assist in checking the processing quality and assembly quality of parts of feed transmission mechanism

8 do a good job in software backup and version management of CNC machine tools

fanucpower-d motion controller is equipped with flash memory card, which can backup system parameters, PLC logic control program and part processing program. When the system fails and needs to be replaced, this backup can quickly restore the normal operation of the system. Of course, it also facilitates the mass production of CNC machine tool manufacturers and shortens the online debugging cycle

9 build good service means

prepare detailed operation and maintenance instructions to guide users in use and maintenance. Do a good job in user training and after-sales service to make users satisfied

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