Summary of titanium plate blanking method!
The titanium plate shall be cut before forming. The conventional sawing, milling, shearing and punching methods are also used for cutting titanium plates. Titanium plate is different from aluminum alloy blanking due to its high strength.
1. Sawing.
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 3mm. This method does not produce edge cracks, and its disadvantage is burr, which must be polished after blanking. At present, most of them are used in such processes as trimming, trimming and end cutting.
Band saw cutting can be divided into three categories: friction, semi friction and ordinary band saws. Because of the high linear speed, the friction band saw has severe friction between the saw blade and the workpiece, and the temperature in the cutting area is very high, which reduces the cutting resistance of materials, improves the machinability, and has high efficiency.
The band used for titanium sawing shall be of rigid structure with enough power to maintain a constant speed during sawing; It shall be able to feed automatically, tension the band saw and provide sufficient coolant. The blade can be maintained and stable results can be obtained by using a conventional high-speed steel band saw. Saw blade with tungsten carbide blade is used for sawing particularly thick materials, which can reduce the height of burr and the depth affected by heat.
2. Milling.
Use a milling cutter to mill a stack of titanium plates to the required shape, and the milling head moves along the milling template, or use a large CNC sheet metal milling machine to automatically mill. The stretched edges such as concave curve or flanging shall be polished before forming to prevent cracks.
3. Cut.
Blanks or parts with linear shape can be cut on the gantry shear. If ordinary shears are used, carefully check whether the equipment can cut titanium plates. Titanium alloy plates with a thickness of less than 35mm can be sheared to the required size under production conditions. If necessary measures are taken to avoid slipping during shearing, thicker plates can also be sheared. To prevent slipping, a large clamping pressure is required. On the edge of the titanium plate being sheared, especially for the thicker titanium plate, the straight-line deviation is 0.25-0.50mm, which is usually caused by insufficient rigidity of the shear blade. This defect can sometimes be overcome by using thicker cutting edges. If the blocking device is modified, and digital display, fine adjustment and other technologies are adopted, the blanking accuracy can also be improved. The depth of the titanium plate edge crack is not more than 0.4 mm, which can be removed by grinding wheel and filing. If shearing will cause cracks in key parts of parts, cutting methods such as band saw shall be considered. When the gantry shear is used for blanking, the small gap between one side of the shear is 2-3% of the material thickness, the shear angle is 75 ° - 85 °, the back angle is 2 ° - 3 °, and the inclination angle of the upper blade of the diagonal shear is 2 ° - 5 °.
The titanium plate can also be cut with ordinary rolling shear equipment. The circular shear can cut contour lines with large curvature radius (smaller radius is about 250mm). This method is used for titanium plates with a thickness of F less than 2.5mm. The current vibrating shearing machine is only suitable for cutting titanium plates with a thickness of about 2mm. The edges of the sheared rough materials must be filed or ground, leaving a filing allowance of more than 0.25mm. For thin materials (thickness<0.8mm), lever type manual shear or hand shear can also be used when the quantity is small.
4. Punching.
Generally, the required shape of the blank is cut on a punch. Generally, for wool with simple shape, the larger blanking thickness is about 3mm. The titanium plate blanking die shall be rigid enough, and the upper and lower dies shall be kept in accurate relative positions with guide posts. When manufacturing various flat parts or blanks of various shapes, the smaller size of titanium plate punching and the smaller radius of the connecting edge of the punching parts should meet the requirements.
In addition, blanking can also be done with a punching and shearing machine. During processing, crescent shaped notches are punched out with a small die according to the sample plate and connected to each other, so as to cut out the burrs of the parts, and then trim the edges. The edge quality and accuracy are not as good as those of the punching die, and the efficiency is not high. The advantage of punching and shearing processing is that the production preparation cycle is short, and it is often used in small batch production.
