With the rapid development of science and technology, the use of metal stamping parts in various industries is increasingly broad, and the requirements for product quality and size are increasingly harsh. The ancient processing technology of a few products once could not meet the requirements. In the process of stretching, due to the anisotropy of the material, the thickness is not symmetrical and the positioning is not accurate or the deep drawing die gap is not symmetrical, the top of the drawn stamping parts will not be neat. On the end requirements of flush, beautiful parts on the need to supplement the cutting process. In the past, simple edging processing skills (flying edge of a simple mold or cutting edge on a lathe or a spinning machine) could not meet the requirements of the officials, and the work was low obedience. With high precision rotary cutting die can achieve the desired effect.
Hardware mold in the past few years have not introduced the process of die-inside rotary cutting, ordinary continuous drawing mold is direct blanking or two rotary cutting processing. Direct blanking has low requirements on the mouth of the product, and the length and size can not reach the precision of rotary cutting. Second rotary cutting processing and manpower consumption, power is not high. In recent years, the development of hardware mold processing equipment and planning process is very fast. Many continuous drawing molds choose the die internal rotary cutting process.
Now let’s analyze in detail how to change the internal rotary cutting of the die:
- It is necessary to leave a free step in front of the blanking step before continuous drawing of the die, because there is enough space to meet the needs of changing rotary cutting. Ordinary small products, thin products demand about 60*60 insert orientation, large products, or products with thick tensile data, the demand space is a little larger. Ordinary continuous drawing die plan to leave a free step before blanking.
- Due to the die cutting demand walk slider, the distance to meet the demand, so to meet the template height, ordinary die height to more than 280, not enough to increase the foot pad.
- The very link in die rotary cutting is to ensure the balance of the rotary cutting process, the bottom of the slider needs to meet the spring force, can choose nitrogen spring.
- Die-inside rotary cutting and single process rotary cutting similar, is the exercise of the center of the die and the slider around and around sliding to achieve the purpose of rotary cutting, but the continuous stretching die space is small, but also to synchronize with all the mold, so the slider to small, but also to high precision, less distance, ordinary 5-10 mm is necessary to complete all rotary cutting action, in order to ensure that the mouth of rotary cutting is flat, We plan that the slider should be precise, the gap should not be too large, and the needle can be inlaid around the mold center, so as to slide smoothly and the slider is not simple to wear.
- Die-inside rotary cutting has another difficulty, that is, the positioning center on the rotary cutting punch. Single punching die is to put the positioning center into the product by hand, and then into the mold, and then remove the positioning center after stamping, but die-inside rotary cutting can not be manually put the positioning center.
