Roll Forming Machines is a kind of high-performance forging equipment that can cut and plasticize the coil, and can produce hundreds of bolts per minute. According to the different structure of forging die, can produce a variety of parts and screw blanks. This paper describes the structure and characteristics of the equipment, which is indispensable in the process of bolt making, and introduces the latest function and development trend of the Roll Forming Machines. In recent years, in the molding process worthy of special attention to the two aspects of technology: First, replace the preparation process and improve the operating rate of technology; Second, high-precision molding technology.
1. The production of bolt blank
Bolts are mainly made of top upsetting machine or bolt forming machine. The nut blank is mainly made of nut forming machine. Simple shape of the bolt blank through the two processes upsetting can be processed, hexagonal bolts and hex bolts through the 3-4 process upsetting can be processed. The production of nut blanks was mainly cut prior to the 1950s and is now available in 4 to 5 steps upsetting.
2. Roll Forming Machines
The Roll Forming Machines is a kind of horizontal press, which is mainly driven by crank mechanism. The Roll Forming Machines cut the incoming material, i.e., the coil or bar, into a predetermined length, and then the blank was sandwiched between a fixed forging die (female mold) and a moving die (male mold) for molding. It is mainly used for bolts, rivets and parts of the cold upsetting and hot upsetting.
3. The construction of the Roll Forming Machines
The Roll Forming Machines is composed of a transmission device, a feeding device, a shearing device, a forging device, a pushing device, and a handling device.
The main transmission device to the main generator, the power transmission to the transmission mechanism. It is regularly driven by pneumatic clutch gears and cams.
The feeding device is composed of a straightening machine, a conveying roller and a feeding driving device. The feeding machine is used to straighten the curved coil material; the conveying roller is used for feeding the wire into the roll; the feeding driving device is used for adjusting the conveying stroke of the wire, and the conveying length of the wire reaches the prescribed requirement by the transmission drive.
The shearing device is a device that cuts the wire into a prescribed length. It is provided with a stopper for controlling the conveyed material to stop at a prescribed position; and a push-out machine for pushing the cut wire from the shearing machine.
The forging device turns the rotary motion into a reciprocating motion through the crankshaft, thereby driving the plunger holding the male mold.
The push-out device is composed of a KO on a female mold side on which a molded blank is pushed out from a forging die and a PKO on a male mold side.
The handling device is a device for conveying the blank to the next process. The nut forming machine is equipped with a rotating chuck capable of reversing the molding direction of the male mold and the female mold by 180 °. In addition, the bolt forming machine is equipped with an open cam and a timing switch to hold the manipulator.
The drive system of the Roll Forming Machines drives the entire system with a main generator. Each organization can work according to the set time.