Shantou Film Blowing Machine tells you what are the reasons and maintenance methods for the damage of the tie rod of the convenient bag film blowing machine?

Shantou Film Blowing Machineshare:

Convenient bag blown film machineWhat are the reasons for tie rod damage and maintenance methods? (1) Reasons for tie rod damage The four tie rods in the mold clamping device are fixed on the template frame at both ends by nuts, and the template for clamping the forming mold is on the tie rod shaft on the four tie rods. Sliding, so that the tie rod is subjected to both axial tension and radial force of the mold when it works, and at the same time, the template slides on it. Stretched like this for a long time

Convenient bag blown film machineWhat are the reasons for damage to the tie rod and how to repair it?

(1) Reasons for damage to the tie rod

The four tie rods in the mold clamping device are fixed on the template frame at both ends by nuts, and the template with the clamping forming mold on the four tie rods slides on the tie rod shaft, so that the tie rods are subjected to both axial tension and the diameter of the mold during operation. At the same time, the template must slide on it. In this way, under long-term tension, radial force and friction, the tie rod will experience wear on the working surface, the shaft will bend and deform, or even break. (2) Repair method after tie rod is damaged

The damage of the tie rod is mostly manifested as the severe wear of the working surface, followed by the fracture at the junction of the tie rod shaft diameter change.

①Repair method when the tie rod is severely worn

a. Remove the tie rod and straighten the bent section.

b. Grind the center holes at both ends of the tie rod shaft.

c. The working surface of fine turning rod wears until it sees a circle. The working surface roughness R. should not be greater than l·6cm, and the tolerance of coaxiality and roundness is o·oZmm.

d. The working surface is plated with hard chromium. After hard chromium plating, the diameter of the tie rod should be larger than the diameter of the original drawing, leaving the amount of fine grinding or polishing.

e. Fine grinding or polishing the working surface of the chromium layer, according to the H7/f8 precision tolerance and the movable template hole, the roughness of the working surface is R. Should not be greater than. "Spell m.

②Repair method of tie rod fracture

a. Use 45 high-quality carbon structural steel or 40Cr alloy structural steel for blanking, the diameter should be 4~6mm larger than the original diameter, and the length should be 30mm longer than the original shaft.

b. The end face of the fracture of the long shaft of the original pull rod is flat, the drilled bamboo shoot is 15mm, and the depth is 20mm. The short shaft is flat end face of the new material, and the shaft of rnm and length is 18mm in the end face. The hole and the shaft (pointing to the 15mm position) press HS /k7 Cooperate with precision processing, the bevel weld is poured out at the welding place of the two parts.

c. The two parts are assembled together at 15mm, aligning the coaxiality, and welding (pay attention to the cooling of the original working surface of the tie rod to prevent the chromium layer from falling off).

d Annealing treatment to eliminate welding stress.

e. The end face of the welding shaft of the car is flat, and the center hole is drilled.

f. Align with the original working surface of the tie rod as the reference, and turn the new welded shaft end to the original size of the original drawing.

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