Alloy Bushing The alloy bushing must be preheated during the start of production to prevent the sudden emergence of tuft cracks in the cold alloy bushing when the stainless steel bushing encounters hot molten metal. The more complex alloy shaft Set can be used torch, liquefied petroleum gas, good conditions with the mold temperature machine, the relatively simple alloy sleeve can be preheated by slow injection.
A: Maintenance of alloy bushings:
1. It is very troublesome to clean the parting surface of the alloy shaft sleeve. It is also easy to neglect the DU boundary lubricating sleeve. If the boss starts high and buys a good alloy sleeve, then it seems easy to work Much more, if the quality of the alloy bushing is poor, there will inevitably be flash or dirt on the parting surface of the alloy bushing during production. Operators should always clean these parts and equip them with a small blade at any time.
2. If the alloy bushing is equipped with neutron control, be careful not to forbid the connection of the signal cable between the die casting machine and the alloy bushing. The reason is very clear. In daily production, it is hard to avoid water on the signal cable or Is the joint bandage easy to break, resulting in short circuit with the machine, if the gear pump dedicated bushing signal error, ranging from automatic alarm delay time, weight signal disturbance, the top of the alloy sleeve bad. Cause unnecessary loss. Travel switch pay attention to waterproof.
Two: alloy sleeve material selection:
Should have good corrosion resistance, low prices, sources enough. After the formation of gelatinous deposits by oxidation, corrosion of the bearing material. Bearings and alloy bushings commonly used materials are divided into two categories of metal materials and non-metallic materials ordinary gray cast iron, wear-resistant cast iron, ductile iron for low speed light load, or open transmission alloy bushing mechanism: ZCuPb30 casting or sintering Attached to the inner surface of the steel backing bearing a pair of metal, good anti-cementing performance ZCuSn10-l anti-friction and wear resistance are good, the best bearing materials, high speed heavy load Such materials hardness and strength higher than the Babbitt, corrosion-resistant , But running poor, matching the journal requires a higher hardness and finish, suitable for medium speed heavy load.
Should have sufficient compressive strength, fatigue resistance and the ability to withstand shocks. Alloy sleeve alloy thickness (0.013-0.13) mm. Good adhesion. When the load is large, high speed, the alloy sleeve clearance is too small, the surface finish is not high, poor lubrication, we should carefully select the material match to prevent the adhesion of friction wear a glue. Has the ability to adapt and contain foreign objects. Materials with low hardness, good plasticity and low modulus of elasticity have good adaptability and ability to contain foreign materials.