The cold heading process is a forging and forming method that uses a cold heading machine to thicken the top of the bar or wire at room temperature. The cold heading machine can sequentially complete cutting, heading, accumulation, forming, and chamfering. , rolling, reducing and trimming processes, the bar is automatically fed to a certain length by the feeding mechanism, the cutting mechanism cuts it into blanks, and then is sent to the accumulation, pressing and punching stations in sequence by the clamp conveying mechanism for forming. . It is mainly used to make parts such as bolts, nuts, nails, rivets and steel balls. The forging blank material can be copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy. The following is a brief introduction to the advantages of multi-station cold heading machine equipment:
1. Structural characteristics of multi-station cold heading machine
(1) Crankshaft, machine body and impact connection The connections of the rods are all made of highly wear-resistant alloy copper tiles, which have large bearing capacity and long service life.
(2) The machine body is cast from ductile iron with added alloy, which has high tensile strength and good wear resistance.
(3) Using a two-stage gear transmission system, the transmission efficiency is high and the transmission torque is large.
(4) Equipped with pneumatic clutch brake to reduce motor power and energy consumption.
(5) The cutting system uses a guide plate to drive the cutting rod. The guide plate reciprocates and the cutting force is transmitted linearly. The force is large, stable and has good dynamic balance.
(6) The multi-station cold heading machine uses open and close clamps to transfer workpieces, and the clamping system can be flipped or translated to facilitate the arrangement of the molding process.
(7) Equipped with a variable frequency speed regulating device, which can adjust the speed steplessly within a certain range.
(8) Equipped with fault detectors and safety protection devices, the equipment will automatically shut down when it fails, giving maximum protection to the equipment and tools.
(9) The feeding box is equipped with a thrust device to improve the feeding accuracy.
(10) The oil circuit design of the lubrication system is simple and efficient, which can effectively protect the punch rod and workpiece on the basis of ensuring circulation filtration.
2. Process characteristics of multi-station cold heading machine
(1) Apply a certain pressure to the metal blank at room temperature to cause plastic deformation in the mold cavity. Molding to specified shapes and sizes.
(2) It has good surface quality and high dimensional accuracy.
(3) The cold heading process is suitable for large batches of fasteners of various specifications.
3. Selection of raw materials for multi-station cold heading machine
(1) The cold heading machine is mainly manufactured based on the theory of metal plastic transformation, and when selecting metal The materials are also of very high quality and have very strict standards, especially for the chemical composition and mechanical properties of rivet steel.
(2) The cold heading machine has good surface quality and very high dimensional accuracy during production. It has good cold work hardening during the upsetting process, so it can maintain good The amount of deformation will not be too large, thereby reducing cracking and other phenomena in the workpiece.
IV. Selection of special cold heading oil for multi-station cold heading machines
(1) It has excellent extreme pressure lubrication properties, high temperature resistance, extreme pressure anti-wear properties, and anti-wear properties. Rust resistance and high temperature oxidation resistance and stability. It improves the accuracy and smoothness of processed parts, prevents mold sintering, meets multi-station molding of standard and non-standard parts, and is fully capable of cold heading stainless steel workpieces.
(2) It can reduce oil fumes and "drifting fog" to a minimum, and meet the strict requirements of nuts with strong shrinkage molds.
(3) It has good performance on workpieces with relatively large variation, such as the forming process of hollow and high-strength bolts, sleeves, stainless steel hollow and semi-hollow rivets, etc.
(4) It can effectively protect punch rods and molds and extend their service life.
(5) The heat dissipation effect is good, which avoids excessive local temperature of the workpiece and mold during the cold forming process.
(6) It has good high temperature resistance and is not easy to produce sludge. Low odor and smoke, protecting the operating environment.
(7) It has certain rust resistance and can meet the rust prevention requirements between processes.
(8) It can meet the demanding requirements of cold heading stainless steel forming and large-variation carbon steel forming.