The shrinking machine utilizes hydraulic technology to feed the portion of round steel, threaded steel, etc., that needs to be reduced in diameter into a special mold for cold shrinking and forming. The density of the steel in the reduced portion can be greatly increased, thereby improving the material's compressive strength. Plasticity and impact toughness are not reduced, ensuring consistent strength between the threaded portion and the rod body. This solves the drawback of reduced compressive strength and impact toughness caused by lathe stripping. It is an ideal machine for producing large-diameter round steel, anchor bolts, double-ended building bolts, high-speed bridge bolts, and mining anchor bolts, anchor bolts, and long-rod bolts. This equipment can compress the material to the thread diameter in one pass, increasing the material's density and length, and improving the tensile strength of the anchor bolts. It is a replacement product for lathe stripping.
Structure and Performance of the Shrinking Machine:
1. Machine Body: The machine body is constructed by welding a frame of channel steel. Steel plates are then welded to the bottom and sides, forming an oil tank at one end and housing the electrical control box and hydraulic components at the other. The frame cover is welded to the frame using a middle plate, forming the machine body. 2. Clamping Part: The clamping part is located on the right end cover of the machine body. It consists of an external hydraulic cylinder and clamping device. The hydraulic cylinder uses pulling force to clamp the workpiece material, and pushing force to release it.
3. Feed Box: The feed box is located on the cover at one end of the machine body's oil tank. It contains a hydraulic cylinder. A carbide mold is mounted at the front end of the cylinder. An automatic water or oil filling device, filled with oil or water, is installed above the front of the mold.
4. Guide Shaft: Two parallel guide shafts are located between the clamping box and the feed box. The carbide mold at the front end of the feed box cylinder, supported by the guide sleeve, is pushed forward and pulled back by the cylinder to complete the diameter reduction.
5. Hydraulics: An electric motor drives a gear pump, which controls two cylinders through control valves and other components. One cylinder controls the clamping device to complete the clamping and releasing actions. The other cylinder controls the pushing and pulling back of the carbide mold to complete the diameter reduction.
6. Electrical Control Box: The electrical control box is the command center of the entire machine. Utilizing advanced PLC technology, it inputs various instructions into the electrical control (computer). It controls the hydraulic system to clamp the workpiece, advance it for diameter reduction, withdraw it from the mold, and release the workpiece (and applies lubricant during diameter reduction at the appropriate time).
7. Cooling Fan: Installed on the lower side of the feed box, it cools the temperature of the hydraulic oil in the hydraulic system, stabilizes the working state of the hydraulic system, and prevents the problem of insufficient hydraulic pump pressure due to excessively high oil temperature.
