Before forming the titanium plate, it is necessary to cut the material. Titanium plate blanking also uses conventional sawing, milling, punching and shearing methods. Because of the high strength of the titanium plate, it is different from the aluminum alloy blanking.
Band saw. The band saw has high processing efficiency and convenient production preparation, but it is not suitable for processing too thin materials. It is often used to cut titanium plates with a thickness of more than 3 mm. This method does not produce edge cracks. Its disadvantage is that it has burrs and must be polished after cutting. At present, more processes are used for trimming, trimming and trimming.
Band saw cutting can be divided into three categories: friction type, semi-friction type and ordinary band saw. Due to the high linear velocity during friction band saw work, violent friction occurs between the saw blade and the workpiece, and the temperature in the cutting zone is high, thus reducing the cutting resistance of the material, improving the workability, and high efficiency.
The band for sawing titanium should be a rigid structure with sufficient power to maintain a constant speed during sawing; it should be able to feed automatically, tension the band saw and provide sufficient coolant. With the usual high-speed steel band saw, the cutting edge can be maintained and stable results can be obtained. A blade with a tungsten carbide blade is used to cut particularly thick materials, which can reduce the height of burrs and the depth affected by heat.
Milling. Use a milling cutter to cut a stack of titanium plates to the desired shape, and move the milling head along the milling template, or use a large CNC sheet metal milling machine to automatically mill. For stretched edges such as concave curves or flanging, polish the waist before forming to prevent cracks.
Shear. Manufacture straight-line wool or parts, which can be cut on the gantry shearing machine. If using an ordinary shearing machine, carefully check whether the equipment can cut the titanium plate. Titanium alloy plates with a thickness of less than 35 mm can cut the required size under the production conditions. If necessary measures are taken to avoid slipping during shearing, thicker plates can also be sheared. To prevent skidding, a larger clamping pressure is required. On the edge of the sheared titanium plate, especially for thicker titanium plates, the straight line deviation is 0.25-0.50 mm. This deviation is usually caused by the insufficient rigidity of the cutting edge. Switching to a thicker cutting edge sometimes overcomes this defect. If the material blocking device is modified, and the technology of digital display and fine adjustment is used, the cutting accuracy can also be improved. The crack depth of the edge of the titanium plate does not exceed 0.4 mm, which can be removed by grinding and filing. If shearing will cause cracks in key parts of the part, the cutting method such as band saw should be considered. When cutting with a gantry shear, the minimum gap between the single sides of the scissors is 2-3% of the thickness of the material, the shear angle is 75 degrees-85 degrees, the back angle is 2 degrees-3 degrees, and the angle of inclination of the blade on the inclined cutting machine 2 degrees-5 degrees.
Titanium plate can also be loaded with ordinary rolling shear equipment. Circular shears can cut contour lines with a large radius of curvature (minimum radius is about 250 mm). This method is used for titanium plates with a thickness below 2.5 mm F. The current vibrating shearing machine is 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 allowance of more than 0.25 mm. For thin materials (thickness <0.8 mm), when the number is not large, you can also use the lever type manual shear or manually cut the material.
Die-cutting. Generally, the wool of the desired shape is punched out on the punching machine at a time. Usually for wool with simple shapes, the maximum cutting thickness is about 3 mm. The blanking die of the titanium plate should have sufficient rigidity, and the guide post can be used to maintain the accurate relative position of the upper and lower dies. When manufacturing various flat parts or various shapes of wool, the minimum size of the punching of the titanium plate and the minimum radius of the joining edge of the punched parts should meet the requirements.
In addition, it can also be blanked with a punching and shearing machine. During processing, the crescent-shaped cut is punched out with a small die according to the template and connected to cut out the burr of the part, and then the key edge is trimmed. Not very 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.