How many methods are commonly used for cutting?

Before the titanium plate is processed into shape, the material must be cut first. Titanium plate blanking also adopts conventional sawing, milling, punching and shearing methods. Due to the high strength of Ultra-Thin Titanium Alloy Sheet, it is different from aluminum alloy blanking.

Band saw. Band saw processing efficiency is high, production preparation is convenient, but it is not suitable for processing too thin materials. It is often used for cutting titanium plates with a thickness of more than 3 mm. This method does not produce edge cracks. The disadvantage is that there are burrs, which must be polished after cutting. At present, it is mostly used for trimming, trimming and end trimming processes.

Band saw cutting can be divided into three categories: friction type, semi-friction type and ordinary band saw. When the friction band saw is working, due to the high linear speed, severe friction occurs between the saw blade and the workpiece, and the temperature in the cutting zone is very high, thus reducing the cutting resistance of the material, improving the machinability and high efficiency.

The belt used for sawing titanium should have a rigid structure and have enough power to maintain a constant speed during sawing; it should be able to feed automatically, tension the band saw and provide sufficient coolant. With ordinary high-speed steel band saws, the edge can be maintained and stable results can be obtained. Saw blades with tungsten carbide blades are used for cutting particularly thick materials, which can reduce the height of burrs and the depth affected by heat.

Milling. Use a milling cutter to mill a stack of Grade 5 Ti-6Al-4V Titanium Sheets to the desired shape, and the milling head moves along the milling template, or use a large CNC sheet metal milling machine for automatic milling. For stretched edges such as concave curves or flanging, the waist is polished before forming to prevent cracks.

Cut. Manufacturing straight-line shape wool or parts can be cut on the gantry shearing machine. If an ordinary shearing machine is used, carefully check whether the equipment can shear the titanium plate. Titanium alloy plates with a thickness of less than 35 mm can already be cut to the required size under production conditions. If necessary measures are taken to avoid slipping during cutting, thicker plates can also be cut. In order to prevent slippage, a higher clamping pressure is required. On the edge of the sheared titanium plate, especially for thicker titanium plates, the linear deviation is 0.25-0.50 mm. This deviation is usually caused by insufficient shear blade rigidity. Switching to a thicker blade can sometimes overcome this defect. If you modify the stopper device, and use digital display, fine-tuning and other technologies, the cutting accuracy can also be improved. The crack depth on the edge of the titanium plate does not exceed 0.4 mm, which can be removed by grinding wheel grinding and filing. If the shearing will cause cracks in the key parts of the part, a cutting method such as a band saw should be considered. When cutting materials with gantry shears, the minimum gap between the single sides of the scissors is 2-3% of the material thickness, the cutting angle is 75°-85°, the relief angle is 2°-3°, and the inclination angle of the blade on the oblique blade shearing bed is 2 degrees-5 degrees.

Ordinary rolling shear equipment can also be used for cutting. Circular shears can cut contour lines with a large radius of curvature (the minimum radius is about 250 mm). This method is used for titanium plates with a thickness of less than 2.5 mm. The current vibrating shears are only suitable for cutting titanium plates with a thickness of about 2 mm, and the edges of the cut wool must be filed or ground, leaving a file repair margin of more than 0.25 mm. For thin materials (thickness <0.8 mm), when the quantity is not large, you can also use lever type manual shears or hand-cut materials.

Die cut. Generally, the wool material of the required shape is punched out on the punching machine at one time. Generally, for wool with a simple shape, the maximum blanking thickness is about 3 mm. The titanium plate blanking die should have sufficient rigidity, and the upper and lower die should be kept in an accurate relative position with guide posts. When manufacturing various flat parts or various shapes of wool, the minimum size of the punching hole of the titanium plate and the minimum radius of the connecting edge of the punching parts should meet the requirements.

In addition, you can also use a punching and shearing machine to cut the material. When processing pure titanium plates, use a small die to punch out crescent-shaped incisions according to the template and connect them, so as to cut out the burrs of the parts, and then repair the key edges. The edge quality and accuracy are not as good as the die. Blanking is not efficient. The advantage of punching and shearing processing is that the production preparation cycle is short, and it is often used for small batch production.