What is the difference between clamping force and clamping force?

The clamping device of elbow-bar injection molding machine is a device that uses elbow-bar mechanism to prestress the clamping system and then lock the mold. When the injection molding machine closes the mold, the closing cylinder pushes the moving template forward through the toggle mechanism. When the parting surface of the mold just touches, but the elbow mechanism has not been arranged in a line, the moving template will be affected by deformation resistance. When the working oil of the mold clamping cylinder continues to be pressurized to overcome the deformation resistance of the system, the elbows can be arranged in a row to form a mold clamping force that is not expanded by the molten plastic in the mold cavity. After clamping, due to the expansion force of molten plastic in the mold cavity, the clamping structure of the injection molding machine follows Hooke's law, and its clamping force is Pcm=Z E Fp DLp/ Lp, where Pcm- clamping force Z- elastic modulus FP of tie rod material-cross-sectional area DLP of tie rod-length of deformed part of tie rod for the same injection molding machine mechanism, because Z, L. for the same clamping mechanism, The enlarged clamping cylinder will produce greater deformation DLp on the same pull rod through the elbow joint force amplification, thus making the clamping mechanism form greater prestress. At present, many domestic injection molding machine manufacturers adopt the clamping force as the specification parameter of injection molding machine. Therefore, driven by economic benefits, some plastic machine suppliers increase the clamping force by adding clamping cylinders to small joint machines. This practice gives people the illusion of "big clamping force and low price" and deceives users to buy their machines. Originally, each tonnage of injection molding machine has undergone strict force calculation and has the most reasonable structural configuration (including the relationship between mold size and injection quantity). However, this immoral practice simply does not consider the bearing capacity of the joint copper sleeve, steel sleeve and pull rod after the clamping force of the small joint machine is increased. This irresponsible practice will make the copper sleeve and steel sleeve of the joint wear or even the pull rod break in a short time, which will seriously affect the service life of the injection molding machine, regardless of the immediate interests of users. According to this practice, the formula for calculating the clamping force of a 2000T machine with a capacity of 3000T can be easily obtained as follows: clamping force F(TON) F=Am*Pv/ 1000 F: clamping force TON Am: cavity projection area CM2 Pv: filling pressure KG/CM2 (the filling pressure of general plastic materials is150-350kg).