Strap Grain Titanium Alloy Wax Casting

1. Mold design and manufacturing: Based on the design drawings of the watch strap particles, use CAD/CAM technology to design the mold. Then, mechanical processing, electrical discharge machining and other methods are used to manufacture the mold, ensuring the dimensional accuracy and surface quality of the mold.

2. Wax mold injection: Heat the wax material to a molten state, inject the wax material into the mold through an injection machine, cool it down, and then remove the wax mold. The size and shape of the wax pattern should be consistent with the design requirements of the watch strap grain, and the surface should be smooth and defect free.

3. Wax pattern combination: Combine individual wax patterns into wax patterns by welding or bonding, while installing sprue and riser systems. The design of wax molds should take into account the flow and filling of the molten metal to ensure the quality of the castings.

1. Coating surface layer: Immerse the wax mold assembly into a specially designed coating to evenly coat the surface of the wax mold with a layer of coating. Coatings are generally composed of refractory materials (such as zircon sand, corundum sand, etc.) and binders (such as water glass, silica sol, etc.). After coating, sprinkle a layer of fine sand on the surface of the wax mold and then dry it.

2. Coating and hanging the back layer: Repeat the operation of coating and hanging the surface layer, apply multiple layers of back layer paint and sand to increase the strength and thickness of the shell. The particle size of the backing coating can gradually increase to reduce costs.

3. Dewaxing: Place the shell into a steam dewaxing kettle or hot water to melt the wax mold and flow out of the shell, forming a cavity. The dewaxing process should be thorough to ensure that there is no residual wax inside the shell.

4. Roasting: Place the dewaxed shell into a roasting furnace for high-temperature roasting to remove moisture, organic matter, and impurities from the shell, thereby improving its strength and fire resistance. The calcination temperature is generally between 900-1100 ℃, and the calcination time depends on the size and thickness of the shell.

1. Titanium alloy melting: Place titanium alloy raw materials into a vacuum induction furnace or a non consumable electrode arc furnace for melting. During the melting process, the vacuum degree, temperature, and melting time inside the furnace should be strictly controlled to ensure that the chemical composition and quality of the titanium alloy meet the requirements.

2. Pouring: Pour the melted titanium alloy liquid into the mold shell at a certain temperature and pressure. The pouring process should be fast and smooth, avoiding splashing and oxidation of the molten metal. At the same time, the pouring speed and pouring volume should be controlled to ensure the quality of the castings.

1. Sand cleaning: Cool the poured casting to room temperature to remove the mold shell and sand particles. Mechanical sand cleaning, chemical sand cleaning and other methods can be used for sand cleaning.

2. Cutting sprues and risers: Use cutting equipment to cut off the sprues and risers on the casting, then polish and trim them to make the surface of the casting flat and smooth.

3. Heat treatment: According to the composition and performance requirements of titanium alloy, the castings are subjected to heat treatment, such as annealing, quenching, aging, etc., to improve the strength, hardness, and toughness of the castings.

4. Surface treatment: Surface treatment of castings, such as polishing, sandblasting, electroplating, anodizing, etc., to improve the appearance quality and corrosion resistance of castings.

1. Titanium alloy raw materials: Select reliable titanium alloy raw materials, strictly inspect the chemical composition, purity, particle size, etc. of the raw materials to ensure that they meet the design requirements.

2. Wax and coatings: The melting point, hardness, shrinkage rate and other properties of wax should meet the process requirements, while the fire resistance, bonding strength, breathability and other indicators of coatings should meet the needs of shell production.

1. Wax mold production: Control the dimensional accuracy, surface quality, and assembly accuracy of the wax mold to avoid defects such as deformation, cracks, and bubbles.

2. Shell production: Strictly control the coating process, drying time, baking temperature, and time parameters of the shell to ensure its strength, breathability, and dimensional accuracy.

3. Smelting and pouring: Monitor parameters such as temperature, vacuum degree, and chemical composition during the smelting process, control pouring temperature, speed, and pressure, and prevent defects such as porosity, slag inclusion, and shrinkage in castings.

1. Dimensional inspection: Use measuring tools (such as calipers, micrometers, coordinate measuring instruments, etc.) to measure the dimensions of castings to ensure they meet design requirements.

2. Appearance inspection: By visual inspection or microscopic observation, check the surface quality of the casting for defects such as cracks, sand holes, pores, oxide scales, etc.

3. Performance testing: Conduct mechanical property tests (such as tensile testing, hardness testing, etc.) and metallographic analysis on castings to evaluate their performance and quality.