Material stretching and thinning method

The invention relates to the technical field of stamping shaping machining, in particular to a material stretching and thinning method. According to the method, firstly, the concave pit in the corresponding shape is machined in a stamping thinning mode, the concave pit can generate a downward stretching thinning effect on a workpiece in the stamping process, in this way, the stamping thinning mode can stretch a material in the lateral direction while stamping is conducted in the forward direction, and therefore the flowing ductility of the material is greatly improved, and stretching thinning of the material is facilitated. And meanwhile, the stretching and thinning mode does not need too large stamping pressure, so that the machining difficulty is effectively reduced. 本发明涉及冲压塑形加工技术领域，具体是一种材料拉伸变薄方法。本发明首先通过冲压变薄的方式加工出对应形状的凹坑，凹坑在冲压的过程会对工件产生向下的拉伸变薄作用，这样冲压变薄方式在正向冲压的同时，又可以侧向拉伸材料，从而极大的提高了材料的流动延展性，有利于使材料拉伸变薄。同时这种拉伸变薄的方式，不需要过大的冲压压力，进而有效的降低了加工的难度。