Spot inspection management of maintenance and maintenance of CNC machine tools

Posted by Luo Bin on February 5th, 2020

As the CNC machine tool integrates mechanical, electrical, hydraulic, gas and other technologies, its maintenance should be managed scientifically and the corresponding rules and regulations should be formulated purposefully. The hidden troubles found in the maintenance process should be cleared in time to avoid downtime for repair, so as to prolong the average fault-free time of the equipment and increase the utilization rate of the machine tool. Spot inspection is an effective way to maintain CNC machine tools. 

Equipment maintenance based on spot inspection. It is a kind of spot inspection management system developed by Japan on the basis of introducing the preventive maintenance system of the United States. Spot inspection is to carry out fixed-point and regular inspection and maintenance of the equipment in accordance with the provisions of the relevant maintenance documents. Its advantage is that it can eliminate the emergence of the following and the deterioration of performance in the bud and prevent overrepair or underrepair, but the disadvantage is that the workload of regular spot inspection is heavy. This modern maintenance management system, which takes spot inspection as the core in the equipment operation stage, can achieve the purpose of reducing the failure rate and maintenance cost and improving the maintenance efficiency. 

The equipment point verification and repair system of Japan was introduced in the early 1980s, which organically organized the equipment operators, maintenance personnel and technical management personnel. in accordance with the prescribed inspection standards and technical requirements, the parts where the equipment may have problems are inspected, maintained and managed in a fixed, fixed, quantitative, regular and regular manner, so as to ensure the continuous and stable operation of the equipment and promote the development of production and the improvement of operation efficiency. 

The spot inspection of CNC machine tools is the basis of condition monitoring and fault diagnosis, which mainly includes the following contents: 

The main contents are as follows: (1) the fixed point first determines how many maintenance points a CNC machine tool has, analyzes the equipment scientifically, and finds out the location where the fault may occur. As long as you "keep an eye on" these maintenance points, if there is a fault, you will find it in time. 

(2) Calibration should set standards for each maintenance point one by one, such as clearance, temperature, pressure, flow, tightness, etc., there should be a clear quantitative standard, as long as it does not exceed the prescribed standard, it will not be regarded as a fault. 

(3) how often should the inspection be carried out on a regular basis, and the inspection period should be determined.Some points may be checked several times per shift, and some may be checked once a month or several months. it should be determined according to the specific situation. 

(4) to determine which items to check at each maintenance point should also be clearly defined. One or several items may be checked at each point. 

(5) who shall carry out the inspection, whether it is the operator, maintenance personnel or technical personnel, shall be carried out to the person according to the inspection location and technical precision requirements. 

(6) there should also be regulations on how to check the method, whether to observe manually or to measure with instruments, and whether to use ordinary instruments or precision instruments. 

(7) the environment and steps of inspection should be stipulated, whether it is to be inspected in production operation or shutdown inspection, whether to disintegrate inspection or not to disintegrate inspection. 

(8) record inspection should be recorded in detail and filled in clearly in accordance with the prescribed format.To fill in the inspection data and the difference between the inspection data and the prescribed standards, judgment impressions and processing opinions, the examiner should sign and indicate the inspection time. 

(9) those that can be processed and adjusted in the middle of processing and inspection shall be processed and adjusted in time, and the results of the processing shall be recorded by the person. If you do not have the ability or conditions to handle it, you should report to the relevant personnel in time and arrange for it to be dealt with.However, anyone should fill in the processing record at any time. 

(10) the analysis, inspection records and processing records should be analyzed systematically on a regular basis to find out the weak "maintenance points", that is, the points with high failure rate or links with large losses, put forward suggestions and submit them to the designers to improve the design. 

The point inspection of CNC machine tools can be divided into two levels: daily point inspection and full-time point pick-up. The daily spot inspection is responsible for the spot inspection of the general parts of the machine tool. Generally, when the cnc turning parts reaches a relatively long time, it is necessary to deal with and check the faults occurred in the operation of the machine tool, which is carried out by the machine tool operator. The full-time spot inspection is responsible for the key point inspection, equipment condition monitoring and array diagnosis of the silver parts and important parts of the machine tool, making the spot inspection plan and making a good diagnosis record. analyze the maintenance results and put forward suggestions for improving equipment maintenance management, which are carried out by full-time maintenance personnel. 

As a working system, the spot inspection of CNC machine tools must be carried out conscientiously and persevere in order to ensure the normal operation of the machine tools. 

From the point of view of the requirements and contents of the spot inspection, the spot inspection can be divided into three levels: full-time spot inspection, daily spot inspection and production point inspection, and the schematic diagram of the maintenance process of CNC machine tools. 


1. Full-time spot inspection. 

Responsible for the key parts and important parts of the machine tool according to the cycle to carry out key point inspection and standby condition monitoring and fault diagnosis fixed-point inspection plan, make diagnostic records, analyze maintenance results, and put forward suggestions to improve equipment maintenance and management. 

2. Daily spot inspection. 

Responsible for spot inspection of the general parts of the machine tool, handling and checking the faults occurred during the operation of the machine tool. 

3. Production spot inspection. 

Responsible for spot inspection of CNC machine tools in operation, and responsible for lubrication, fastening and other work. 

As a working system, spot inspection must be carried out conscientiously and persevere, so as to ensure the normal operation of CNC machine tools.