Lubricating oil is a prerequisite for the normal operation of multi-station cold heading machine

Lubricating oil is a prerequisite for the normal operation of multi-station cold heading machine

Multi-station cold heading machine is a kind of efficient automatic processing equipment with wide performance and diverse process. The main slider parts (including male mold seat, sun top) and ejection mechanism (including cam, swing frame, ejection rod, etc.) in the cold heading machine must be filled with lubricating oil with appropriate viscosity for lubrication during use. The general use of lubrication pump pipe jet refueling.

1. Lubricating oil condition is an important cause of cold heading machine damage

Water pollution is a major form of pollution of lubricating oil. According to statistics, when the moisture content in the oil reaches 0.05%, the service life of the cold heading machine parts will be reduced by 50%. A trace amount of water may be dissolved in the oil, the specific amount of which depends on the type of base oil and the composition of the additive. For most lubricants, the maximum dissolved amount is generally about 400 ~ 600PPm. Whether it is a trace amount of water dissolved in the oil or the water existing in a free state, it will cause damage to the lubricating oil.

For the multi-station cold heading machine, the particles with relatively large hardness, such as the abrasive particles produced by the wear of the machine parts, are the most harmful. Moreover, a large number of particles, regardless of hardness, are fatal to the cam and the positive top die; another effect of solid impurity particles is the influence on the life of the lubricating oil itself, and the metal particles often become the catalyst, which can accelerate the aging of lubricating oil products.

Therefore, in the maintenance test of lubricating oil, the amount of water and metal particles is an important indicator of the quality of lubricating oil. In the storage of lubricating oil, should avoid water or other impurities on the oil pollution. Lubricating oil plays a key role in the long-term safe operation of the cold heading machine. In the workshop, attention should be paid to the storage of lubricating oil, the method of adding and the inspection of the quality of lubricating oil.

In the early days, many cold heading machines had the problem of oil leakage, and the maintenance personnel did not know enough about the impact of low oil level. When the oil level in the oil tank was low, it was not handled in time, resulting in insufficient local lubricating oil flow and fatigue friction damage of the parts. Generally, when the lubricating oil temperature reaches 75 ℃, the viscosity of the lubricating oil is already very low. In addition, the viscosity of the lubricating oil will change to varying degrees after long-term use. At this time, the viscosity of the lubricating oil cannot meet the requirements. The required oil film is formed on the surface of the parts. If it runs at a high oil temperature for a long time, the surface of the parts and the cam will be damaged. Some synthetic lubricants produce obvious bubbles after operation, which is not conducive to the formation of oil film, which may cause damage to mechanical parts and accelerate pitting and tooth breakage of mechanical parts or gears and racks. This must be paid attention to when purchasing.

2. Lubricating oil quality and on-site maintenance

To ensure the normal and reliable lubrication of lubricating oil is one of the important conditions to ensure the normal operation of the cold heading machine. The daily analysis of oil products should determine the kinematic viscosity, moisture, flash point, freezing point, pour point, sulfur content, density, acid value, chroma, residual carbon, ash, calorific value, total sediment, mechanical impurities, insoluble matter, water separation, foam characteristics, dropping point and other performance indicators of lubricating oil, so as to determine whether the lubricating oil needs to be replaced. Oil analysis should focus on the following points:

① Whether there are water droplets or emulsion; ② Check the viscosity. Compared with the normal value, the difference of viscosity is 20% higher or 15% lower, indicating that the oil has failed. If the insoluble matter exceeds 0.2%, it should be replaced with new oil or filtered.

After the lubricating oil reaches the theoretical service life specified by the manufacturer, the oil should be tested regularly and filtered. According to experience, if the main indicators such as moisture, emulsion, insoluble content and viscosity have not reached the replacement requirements, the lubricating oil can continue to be used.

Judging the fault location By detecting the metal composition in the lubricating oil, it can be judged that the metal comes from gears, parts or bearings. If the chromium content in the collected metal is high (high chromium content in bearing steel), it means that the bearing is seriously worn. If it continues to be used, gears and parts may be damaged due to changes in the parallelism between the shafts. The machine should be stopped immediately to replace the bearing. On the contrary, if the chromium content is low, it means that the metal comes from the gear and the parts are worn. If the gear has no obvious signs of damage, it can continue to be used.

Pay attention to on-site maintenance, observe the oil temperature and oil pressure of lubricating oil through background monitoring, compare the display value conditions between different units of the same type, and stop the machine for inspection in time if any abnormality is found. If the oil level is low, timely oil replenishment shall be carried out. If there is a filter element blockage failure, check in time; Check whether the pipeline is unblocked when the oil pressure is low; Ensure that the oil quality, oil temperature, oil pressure, oil pressure, oil pressure, oil pressure, oil pressure, oil pressure, oil level, oil level, oil level, oil.