Correcting the Gollin column: How to correct the Gollin column of an injection molding machine
Release time:
2020-09-14 17:56
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Goliath columns are rod-like components installed on machinery or buildings, playing a traction role. The principle is to balance the sliding of the template and withstand the tension caused by clamping. It is an important component in the injection molding machine industry. In the clamping mechanism, the performance of the Goliath column directly affects the rigidity and stability of the system. Only by improving the structural characteristics of the Goliath column can the rigidity and stability of the system be effectively improved. High-quality Goliath columns are used on disc injection molding machines. The product is designed to withstand enormous clamping forces, prevent flashing of injection or die-casting products, and ensure reliable mold closing. Goliath column design: Before designing clamping columns and Goliath columns, the diameter of the Goliath column is usually specified in the specification table parameters or general drawings, so only its strength, fatigue strength, and thread strength need to be checked. Goliath column usage environment: Short operating cycles, especially for injection molding machines. The products produced can reach 10 seconds each time. It withstands clamping force for a long time and repeats stretching actions.
The analysis of the reasons for the breakage of the Goliath column is mainly as follows: Fatigue failure, temperature strain, and failure caused by instantaneous impact stress can lead to fracture, fracture caused by overload, and fracture caused by composite strain. 1. Fatigue damage. The working process of the injection molding machine is a process of alternating stress, so any factor that causes stress concentration may lead to fatigue damage. Such as: 1) Steps with large changes in shaft diameter. 2) The transition part does not have rounded corners, undercuts, etc. 3) Surface scratches or processing threads accidentally damage the surface of the polished shaft. 4) The surface roughness of the thread is too large. 5) The thread is compressed for a long time, and the surface is damaged due to insufficient surface strength (at the mold adjusting nut). 6) Improper heat treatment of the thread surface will cause stress concentration. 7) Material defects. 2. Fracture caused by temperature strain: If the lengths of the four Goliath columns are different, the thermal stress caused by the rapid increase or decrease of the temperature of the longer Goliath column will be constrained by the other three Goliath columns and will be in a statically indeterminate state, which will lead to the fracture of the Goliath column. 3. Damage caused by instantaneous impact stress: Since the Goliath column type can only release the clamping force before opening the mold, 1) Instantaneous impact during mold opening will cause machine vibration and damage to the Goliath column and other parts. 2) Because the entire clamping part (including the mold) is under stress for a long time, it will cause premature fatigue failure of the parts. 4. If the mold is not flat due to composite strain, the comprehensive error of the Goliath column length (hinge), bearing seat height, and Goliath column length is too large. After straightening the Goliath column, the force on both sides will be uneven. Then 1) cause the rear template to swing, the tie rod to bend, and under the action of bending stress and tensile stress, the Goliath column is easily broken. 2) If the product splashes water, inexperienced operators will further increase the clamping force, which will cause the Goliath column to break, and the mold will deform due to overload.
For the adjustment of the Goliath column, if you adjust it yourself, a suitable mold is usually installed on the machine. After locking, use a dial indicator to measure the distance between the four columns, and then open the mold to adjust the nut on the top plate to achieve adjustment, but this method is suitable for overhaul. Second-hand machines will have some error traces.
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Dongguan Zhanwang Machinery Co., Ltd. is a manufacturer and supplier of various precision mechanical parts, including rubber and plastic machinery parts, pneumatic and hydraulic machinery parts, precision shafts, piston rods, standard chrome-plated bars, guide columns, uprights, guide pillars, rollers, etc. We provide surface treatments such as super mirror polishing, hard chrome plating for different specifications of precision mechanical parts and various molds. We also offer additional surface treatments such as tempering, medium and high-frequency quenching, nitriding, and blackening for mechanical parts. Our factory is equipped with large CNC lathes, ordinary lathes, external cylindrical grinders, centerless grinders, and milling machines, enabling us to process and manufacture various special mechanical parts. We offer free pick-up and delivery with competitive Price.
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