NEWS

LOCATION :
The blanking method of titanium plate stamping process
2024-10-09

The titanium products should be blanked before forming. Titanium plate blanking is also the use of conventional punching, cutting, milling and sawing and other methods. Because of the large mechanical strength of  titanium plate, the blanking methods is different with the aluminum alloy blanking.

1, shearing 

Manufacturing linear shape of the blank or parts can be cut on the gantry shears. If using a conventional shears, carefully check whether the titanium plates can be cut by the equipment. Titanium alloy plate with thickness under 35 mm has been able to cut out the required size under production conditions. Thicker sheets can also be sheared if necessary measures are taken to avoid slipping during shearing. To prevent skidding, greater clamping pressure is required. On the edge of the cut titanium plate, especially for the thicker titanium plate, the linear deviation is 0.25 -- 0.50 mm, this deviation is usually caused by the lack of rigidity of the cutting edge. This defect can sometimes be overcome by using a thicker cutting edge. If the modification of the retaining device and the use of digital display, fine-tuning and other technologies, it can also improve the accuracy of the cutting. The edge crack depth of titanium plate shall not exceed 0.4mm, which can be removed by grinding and filing with grinding wheel. If the cracks occur in the key part, the cutting method such as band saw should be considered. When using the gantry shears to cut the material, the minimum clearance between one side of the scissors is 2-3% of the material thickness, the shear Angle is 75-85 degrees, the back angle is 2-3 degrees, and the inclination Angle of the blade on the oblique-blade shears is 2-5 degrees. Titanium plate can also be applied on the ordinary rolling shear equipment. Circular shear contours with a large tangential radius of curvature (minimum radius approx. 250 mm). This method is used for titanium plates with a thickness of F less than 2.5 mm. At present, the vibration shears are only suitable for cutting titanium plates with a thickness of 2 mm or so. The edge of the blank sheared must be filed or ground, leaving a filing allowance of more than 0.25 mm. For thin material (thickness < 0.8mm), when the quantity is not large, can also be cut by hand with lever or hand cut. 

2, Punching

Generally the blank is punched to cut the desired shape. Usually for blank of simple shape, the maximum blanking thickness is about 3 mm. The cutting die of titanium plate should be rigid enough to keep the upper and lower die in exact relative positions with guide posts. When manufacturing all kinds of flat parts or all kinds of shapes of blank, the minimum size of titanium plate punching hole and the minimum radius of punching part's connecting edge shall meet the requirements. In addition, punching and shearing machine can also be used to blanking. During processing, small punching die is used to punch out the crescent cut and connect it, so as to cut out the parts burrs and then the edge is repaired. But its edge quality and accuracy are not as good as punching die blanking and efficiency is not high. The advantage of punching and shearing processing is that the production preparation cycle is short, and it is often used for small batch production.

3, Band saw 

The advantage of band saw processing efficiency is high with convenient production preparation, but not suitable for processing too thin material. It is often used for cutting the thickness of more than 3 mm titanium plate. This method does not produce edge cracks. The material must be polished because of the burr as its disadvantage. At present, it is mainly used for trimming, trimming and cutting. Band saw cutting can be divided into three categories: frictional type, semi-frictional type and common band saw. Due to the high linear velocity, violent friction occurs between the blade and the workpiece during the friction-type band saw operation, and the temperature in the cutting area is very high, which reduce the cutting resistance of the material and improve the machinability and high efficiency. The band used for titanium saw should be rigid and have enough power to maintain a constant speed when cutting. It is able to automatically feed, tensioned band saw and provide adequate coolant. With the usual high speed steel band saw the edge is maintained and the result is stable. Tungsten carbide blades are used to cut exceptionally thick materials, reducing burr height and depth under heat. 

4, Milling 

With a milling cutter to cut a stack of titanium plate to the desired shape, milling head along the milling template movement or with large CNC sheet metal milling machine automatic milling. For concave curves or flanged edges under tension, polish in front of forming waist to prevent cracks.