Annealing of electric heating tube

Annealing of electric heating tube

1. Whether to anneal, the annealing method and temperature are in accordance with the requirements of the production order;
a. The copper tube is annealed with oxygen welding flame, the temperature is about 400℃, and the annealing color is dark red;
b. Use local annealing machines for carbon steel pipes and stainless steel pipes. The temperature of carbon steel pipe is about 500℃, and the annealing color is medium red. The temperature of the stainless steel tube is about 700℃, and the annealing color is slightly white.
2. When annealing in an electric furnace, put the pipes in the furnace evenly in layers, and not cause uneven annealing due to crowding.
Work clamp measuring tools and equipment: annealing furnace, partial annealing furnace, oxygen welding equipment.

Both ends of the electric heating tube process car

Ensure that the rod car is symmetrical after the lead-out, and the difference between the exposed lengths at both ends is not more than 2mm;
2. The length tolerance of the pipe is ±0.5mm;
3. Use a file to pour the outer burr;
4. Mainly self-inspection, and inspectors conduct random inspections.
Work clamp measuring tools and equipment: trolley and instrument lathe, white steel knife, tape measure, steel ruler.

Shrinking tube of electric heating tube process

Carefully wipe all parts of the pipe clean;
2. Pay attention to the direction of the shrinking tube, and ensure that the solid plug enters the roll first (empty-fired tubes advocate positive and negative shrinking tubes);
3. The tolerance of pipe diameter after shrinking is ±0.08mm (including the tolerance of roundness);
4. The straightness after shrinking the tube is not more than 4mm per meter;
5. For each roll adjustment, no more than 8 pieces of adjustment parts are given;
6. The inspectors sample the pipe diameter and straightness, and sample 20% of the resistance value and pipe length.
Note: After the tube is reduced, the difference between the longest and the shortest tube should not exceed 3% of the "tube length after tube reduction" required by the production order; when the tube length disparity after tube reduction is too large and irretrievable, the waste is included in the powder.
Tools and measuring tools and equipment: powder feeding machine, automatic breakdown instrument, oven, tape measure, cleaning pan, gasoline.

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