There are many factors that affect the life of the mold. The materials used in the mold and the heat treatment process, the hardness of the wire, the foot and method of the machine itself, and so on. Wallboard nails mainly derive profits by quality and quantity. Therefore, it is better to use a better one when purchasing the mold to reduce the number of mold replacements and reduce the defective rate. The wire is made of phosphating annealed wire as much as possible. Although the raw wire reduces the cost of the wire, it affects the life of the die. And the quality of the silk is not easy to control, it is best not to use. The stability of the machine is mainly reflected in the movement gap between the machine and the stability of the die when it is up and down. In addition, the mechanic's operation method is a crucial factor affecting the life of the wallboard nail production mold.
The abnormal damage forms of the mold are mainly explosion modes and punctured or strip-shaped ruptures. The main reason for the explosion mode is that the gap between the die and the die or the punch pin is negative (that is, the machine can hear and feel a punch and the punch and the die directly impact when the machine is running empty). In addition, frequent short materials/collisions and strips can also cause mold bursts. The dot-like and strip-shaped ruptures are caused by the wire being scratched by the edges when entering the mold (that is, the wire does not directly enter the die hole during the die-cutting) or the punch needle is not centered on the positive die-casting center. This situation is mainly to adjust the position of the scissors before the mold is molded, the dwell time and the flatness of the front end of the wire and the adjusting screws. A good model should withstand a million or so impacts under normal use.
The damage of a die is similar to that of a die. I won't say much here. There are usually three types of damage to the needle: wear, broken needles and missing corners. There are several reasons for wear and tear: the quality of the punch needle, the stability of the machine, and the operation (poor or poorly calibrated). The causes of broken needles are generally short materials, bumps, strips, broken punches, bursts, punching, molds, wire punching or die, and machine failure. The missing corner is caused by poor punching, no adjustment of the screw and poor stability of the machine. It can be seen from the above that there are only three points of mold quality, machine stability and operation that really determine the life of the needle. Regardless of the quality of the mold, the instability of the machine is mainly manifested in the main part, that is, the excessive movement of the crankshaft/link/main slide and the instability of the upper and lower dies. (The spring machine has a second shot and is slightly different from other models. If the hook button connected to the upper and lower cams and the gear shaft is worn, the life of the needle will drop sharply.) The first thing to do is to troubleshoot the machine, adjust the gaps and the stability of the die seat, and then the fit of the mold and the moving parts of the machine.
The practitioners at the beginning know that one punch is formed before the second punch, so a die-forming such as bad will directly affect the life of the punch. The main defects of one punching are as follows: one flushing feed is not smooth, one punching is insufficient, and one punching type and angle are bad. One of the rush feeds does not have three aspects: 1. The wire diameter and the gap of the punching hole are small (whether there is a burr at the front end of the wire); 2. Whether the wire staying position is right for a punching hole (the wire needs to be straightened and dip) Should be stable); 3, the retention time of the scissors at the mold is appropriate. The amount of punching and contracting is mainly reflected in the specification of the wire diameter of 2.65. Among the wall nails of various specifications, the 2.65 wire diameter is the most difficult to manufacture, because its forging ratio is the largest, so the amount of expansion and contraction The requirements are also the highest. The ideal amount of punching and contraction should be no less than 12 mm (the other large diameters can be slightly smaller). The angle of a die is determined by the R angle of the die, and is generally about 127 plus or minus 2 degrees (a small value is taken when the R angle is large).
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