Fracture of tinplate during drawing can be caused by several factors. Some of the most common causes are:

1. Unsuitable material: If the tinplate used is not of adequate thickness, ductility or temper for drawing, it may fracture during the process.
2. Die design: An incorrect or worn die design can generate excessive stresses in the tinplate, causing fractures. Make sure that the die design is suitable for drawing and that the parts are in good condition.
3. Insufficient lubrication: Lack of adequate lubrication during the drawing process can increase friction and stresses in the tinplate, which can lead to fractures. Be sure to use the right amount of lubricant for the process.
4. Drawing speed: If the drawing speed is too high, it can generate excessive stresses in the tinplate, which can lead to fractures. Adjust the drawing speed to avoid this problem.
5. Tinplate inhomogeneity: If the tinplate has variations in thickness, composition or mechanical properties, it may be more prone to fracture during drawing. Make sure to use high quality and homogeneous tinplate.

To solve these problems, it is important to identify the exact cause of the fracture and take appropriate measures to correct it. This may include changing material, adjusting die design, improving lubrication, adjusting drawing speed or improving tinplate quality.

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