Failure repair data of the hottest pneumatic moldi

2022-08-16
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Failure repair data of pneumatic forming products

(1) punch temperature is too low. It should be improved appropriately

(2) poor mold structure design. The mold should be modified so that the sheet does not contact the top of the punch during heating

(1) the heating temperature of the sheet or the mold temperature is too low. It should be improved appropriately. Generally, during pneumatic forming, the heating temperature of ABS sheet

is ~c, The mold temperature is 60-82 (c); the heating temperature of high-density polyethylene sheet is 135-150~c, and the mold temperature

is 70-90~c; the heating temperature of low-density polyethylene sheet is 120-135cc, and the mold temperature is ~c; the heating temperature of impact polyethylene sheet is C, the mold temperature is 50-70t; the unplasticized PVC sheet also saves energy and protects the ecological balance. The heating temperature is

140-170~c, and the mold temperature is QE; the heating temperature of the unplasticized PVC sheet is ℃, and the mold temperature is

40-milk ℃; the heating temperature of the polycarbonate sheet is 170-210~c, and the mold temperature is 80-100~c; the heating temperature of the polyacrylate sheet is 150-160~c, and the mold temperature is 6 0—80℃。

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(2) the forming pressure is too small. It should be increased appropriately. Generally, the long-term working pressure is 0.3MPa, and the short-term working pressure is 0.4

mpa

(3) leakage at the sealing part. Air leakage should be eliminated

(4) improper air hole setting. Pores should be added in the parts that are difficult to form, especially in the depression of the final molding. When touching the raw material resin, color masterbatch, the mixing of color masterbatch and raw materials, injection molding process, injection molding machine, mold, etc., pores must be set up. Generally, when the thickness of the sheet is less than 1.5mm, the diameter of the pores is 0.38-0.5mm; When the thickness of the sheet is greater than 1.5mm, the diameter of the pores is 0.8-1mm, and the hole spacing is 10-20mm. On other forming surfaces, the pore diameter remains unchanged, and the hole spacing is 25-508. Cooling medium: ethanol or other unfrozen liquid mm. Generally, the total area of the exhaust port should be greater than that of the air inlet

(5) the friction resistance between the sheet and the surface of the mold cavity is too large. Apply some talc powder on the surface of the cavity and sheet (1) insufficient cooling time. It should be extended appropriately

(2) mold temperature is too high. It should be reduced appropriately

(3) the pressure holding time is too short. It should be extended appropriately

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