Introduction of Progressive Die Roll Feeding Device

1. The characteristics of the roller feeder 　　The roller feeder has been used as an accessory of the stamping machine and is a widely used one in various feeders. This kind of feeding device has high feeding accuracy. At present, even at a high-speed punching speed of 600 times/min, the feeding error is only within ±0.02mm. If used in conjunction with guide pins, the feeding accuracy can reach ±0.01mm.　　The feeding device relies on the friction between the roller and the blank to feed the material, and the contact area between them is large, it will not crush the material, and can play the role of straightening the material. The roller feeding device has good versatility. Within a certain range, regardless of the width or thickness of the material, it can be used only by adjusting the feeding mechanism to match the mold.　　Roll feeding devices are divided into single-roller and double-roller types. The single-roller type is suitable for progressive stamping with a thickness of more than 0.15mm, and the double-roller type can be used for progressive stamping with a thickness of less than 0.15mm. 2. The mechanism and characteristics of the roller feeding device The operating principle and structure of the roller feeding device can be briefly described as follows: 　　① The driving mechanism and the adjustment of the feeding length are currently more commonly used to install an eccentricity at the end of the crankshaft of the punching machine. The disk is driven by the pull rod to make a linear reciprocating motion to drive the rollers to make a rotary motion. The adjustment of the feeding length is realized by the movement of the pull rod on the mandrel of the eccentric disc. ② Intermittent motion mechanism The roller feeding device shown in Figure 6.5.3, when the crankshaft of the punch press rotates, the reciprocating motion of the pull rod drives the rocker arm of the cross joint to swing, and the one-way intermittent motion mechanism drives the feeding roller through the connecting shaft to achieve intermittent feeding. Rotational movement. This kind of one-way intermittent feeding mainly uses the one-way meshing performance of the overrunning clutch to make the roller rotate in one direction and drive the material forward. ③ Roller The roller is a part that directly contacts the material. It has two types: solid roller and hollow roller. For the case of small feeding distance and low speed, the roller can be made solid; when the feeding distance is large, the feeding distance is large. When the speed is high, the rollers generally adopt a hollow structure, which is light in weight and has a small rotational inertia, and can be stopped immediately to ensure the feeding accuracy.　　④ When using multi-station progressive stamping, the mold is designed with guide pins and materials to ensure the positioning accuracy of the material. When the guide pin is working, if the material is under the constraint of the roller, it is impossible to guide the material, resulting in damage to the mold or punching out of scrap parts. Therefore, the roller must be lifted during stamping to ensure that the material is not constrained by the roller and is in a free state, which is beneficial to the guide pin to guide the material. Use relax adjusters, relax brackets and other elements to achieve roll lifting. Figure 6.5.5 is a schematic diagram of the lifting roller. In the figure, when the push rod or the plate cam moves downward with the punch slide block, the relaxation bracket is pushed to swing around the fulcrum O, so that the roller is lifted and the material is released. The function of the material pressing spring is to ensure that there is sufficient friction between the upper and lower rollers and the material to realize the feeding movement of the material.　　⑤ Braking and transmission 　　During the feeding process, due to the inertia of the rollers and the transmission system, if the rollers cannot be stopped and kept in a static state immediately, the feeding accuracy will be reduced. In order to absorb this part of the energy, a brake is generally installed on the end of the roller or on the shaft. In the high-speed roller feeding device, the brake is composed of a brake disc, a brake spring and a brake pad.　　 The driving roller and the driven roller are mostly driven by gears. The outer diameter of the roller should be designed to be the same as the pitch circle of the gear.