Lost-wax Casting Of Titanium Alloy Lock Tongue
The lock tongue is a key component of a lock, its main function being to insert into the latch to lock doors, cabinets, etc., ensuring security. It needs to possess certain strength, hardness, and wear resistance to resist external damage and wear during daily use. Simultaneously, the shape and dimensional precision of the lock tongue are required to ensure a precise fit with the latch, guaranteeing the normal operation of the lock.
Analysis of the Functional and Characteristic Requirements of the Lock Tongue
The lock tongue is a key component of a lock, its main function being to insert into the latch to lock doors, cabinets, etc., ensuring security. It needs to possess certain strength, hardness, and wear resistance to resist external damage and wear during daily use. Simultaneously, the shape and dimensional precision of the lock tongue are required to ensure a precise fit with the latch, guaranteeing the normal operation of the lock.
Analysis of the Selection of Titanium Alloy Material
Strength and Hardness
Titanium alloy possesses high strength and good hardness, meeting the requirements for the lock tongue to withstand external forces during use. It is not easily deformed or damaged, improving the durability and security of the lock.
Corrosion Resistance
Titanium alloy has excellent corrosion resistance, resisting the effects of humidity, oxidation, and other environmental factors, extending the service life of the lock tongue. It is particularly suitable for harsh environments, such as outdoor or humid locations.
Lightweight
Compared to traditional steel materials, titanium alloy has a lower density and is lighter. This provides a better user experience for locks where weight is a concern, such as portable locks or locks requiring frequent operation.
Application Analysis of Lost-Wafer Casting Process
High-Precision Molding
Lost-wafer casting can achieve high-precision molding of complex shapes, meeting the complex geometric shapes and dimensional accuracy requirements of lock tongues. By creating precise wax models, it is ensured that the cast lock tongue has small dimensional tolerances and high precision in its fit with the latch.
Good Surface Quality
The lock tongue obtained by lost-wafer casting has a high surface finish, reducing the workload of subsequent processing. Good surface quality not only improves the appearance of the lock tongue but also reduces friction with the latch, improving the smoothness of lock operation.
High Material Utilization
The lost-wafer casting process can create wax models according to the actual shape of the lock tongue, reducing material waste, improving material utilization, and lowering production costs. Furthermore, for relatively expensive materials like titanium alloys, improving utilization has significant economic implications.
Production Process Analysis of Lost-Wafer Casting of Titanium Alloy Lock Tongues
Wax Model Making: Based on the lock tongue design drawings, precise wax models are made. Methods such as injection molding can be used to ensure the dimensional accuracy and surface quality of the wax models.
Module Assembly: The prepared wax models are assembled into modules. Gates and risers are typically added to the modules to facilitate the injection and venting of molten titanium alloy.
Shell Fabrication: The modules are immersed in a special refractory coating, then sprinkled with refractory sand. This process is repeated multiple times to form a shell of a certain thickness. The shell requires drying and firing to improve its strength and permeability.
Melting and Casting: The titanium alloy raw material is melted in a vacuum induction furnace. After reaching the appropriate temperature and composition, the molten titanium alloy is poured into the shell. During casting, the casting speed and temperature must be carefully controlled to ensure the molten titanium alloy completely fills the shell, avoiding defects such as porosity and shrinkage.
Shell Removal and Cleaning: After the molten titanium alloy cools and solidifies, the shell is removed, yielding the latch blank. The blank is then cleaned to remove excess parts such as gates and risers.
Post-treatment: The latch blank undergoes heat treatment to improve its mechanical properties. Surface treatments, such as polishing and electroplating, can also be performed to improve the surface quality and corrosion resistance of the latch.
Inspection and Packaging: The latch is inspected for dimensional accuracy, surface quality, and mechanical properties. Once qualified, it is packaged and stored for sale.
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