In view of the problem of insufficient lubrication of the used round tube forming machines flying saw saw car, we have 4 methods to improve it. These four methods are based on the improvement of the oil injection system, the improvement of the selection of gear and rack materials, the improvement of the selection of lubricants, and the improvement of the daily maintenance of the lubrication mechanism.

Improvement of gear and rack material selection

At present, the material of gears and racks is mostly 45 steel, which is high-quality carbon structural steel, which is easy to cut, but has low surface hardness and is not wear-resistant; while Cr in 40Cr steel can improve the quenching of steel during heat treatment. The mechanical properties such as strength, hardness and impact toughness of 40Cr after quenching (or quenching and tempering) are obviously higher than those of 45 steel. Normalizing can promote the spheroidization of the 40Cr steel structure and improve the cutting performance of the blank. When the hardness is 174-229HBW, the relative machinability is 60%. Tempered at 550～570℃, 40Cr steel has the best comprehensive mechanical properties. After quenching and tempering and high-frequency surface quenching, 40Cr steel can be used to manufacture parts with high surface hardness and good wear resistance without impact. 40Cr steel has good low temperature impact toughness and low notch sensitivity, and has good comprehensive mechanical properties. Although the market price of 40Cr steel is slightly higher than that of 45 steel, considering the reliability of equipment and the comprehensive benefits of production, the author selects 40Cr steel as the material for making gears and racks of flying saws.

Improved lubricant selection

The selection principle of lubricant should refer to the performance of lubricating material, load size and load characteristics, moving speed, working temperature, surrounding environment, structural characteristics and lubrication method of friction pair. After the technical improvement, the material of the gear and rack of the flying saw is 40Cr. The lubrication of gears and racks is by spraying lubricating oil.

Based on the above factors, industrial gear oil 220 is selected as the lubricant for the technical improvement of the used round tube forming machines. Industrial gear oil 220 has a kinematic viscosity of 189-242mm2/s (40°C), which not only has good anti-wear, load-resistant performance and suitable viscosity, but also has good thermal oxidation stability, anti-foaming, water separation performance and anti-corrosion properties. The rust performance can prevent tooth surface wear, abrasion, sintering and prolong its service life and improve the transmission power efficiency. The lubricant is fully capable of lubricating the friction surface between the gear and rack of the saw car.

Improvement of daily maintenance of lubricating mechanism

The lubrication mechanism provides good lubrication for the saw car. In order to make the lubrication mechanism work smoothly and reliably, daily maintenance and maintenance should be done well.

(1) Maintenance of gear oil pump. The gear pump should be inspected and maintained frequently during use. Care should be taken during disassembly and inspection of the gear pump to avoid damage to the equipment parts, and each part should be preserved and kept clean; the dismantled parts should be inspected in detail , Do non-destructive testing of the gear, no cracks are allowed, the conicity of the journal is qualified, the surface must not have scratches, and the end cover, bracket, and pump body must not have obvious defects; adjust the end face of the gear and the end cover and bracket during assembly. (adjusted by changing the thickness of the sealing gasket between the end cover, the bracket and the pump body); when tightening the end cover bolts, the applied force is symmetrical and even, and the rotor is moved while tightening. When it does not move, the bolts should be loosened and tightened; when adding packing or oil seal, the rotor should be moved while tightening the gland, and it should not be too tight.

(2) Maintenance of electrical appliances and lines. Always check whether the power cord, internal wiring, plug and switch are in good condition, whether the insulation resistance is normal, whether the brush tail seat is loose, the commutator and the brush are in good contact, whether there is an open circuit in the armature winding and stator winding, bearings and rotating parts. damaged, etc.

(3) Maintenance of the oil filling pipeline. The oil injection pipeline used in this technical improvement is 6mm×0.8mm copper tube. The copper tube is hard in texture, not easy to corrode, and resistant to high temperature and high pressure, and can be used in a variety of environments. In the daily production process, the lubricating device should be checked frequently for running, running, dripping and leaking. Once any bad condition is found, it should be repaired or replaced in time. The oil level of the oil storage box should be checked regularly, and the corresponding grade of lubricating oil should be filled if necessary.

Use these 4 methods to improve the lubrication mechanism of the used round tube forming machines flying saw, effectively solve the problem of insufficient lubrication of the used round pipe forming machine flying saw and saw car, and do a good job in mechanical equipment maintenance at the same time.