Hollow body molding method
A molding method and hollow body technology, which can be applied to hollow objects, other household appliances, household appliances, etc., can solve problems affecting the performance of fuel tanks, and achieve the effects of compact structure, silt elimination, and ingenious overall structural design
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Embodiment 1
[0042] Embodiment 1: see Figure 1-Figure 8 , a method for forming a hollow body, said method comprising the steps of:
[0043] 1) Parison extrusion;
[0044] 2) Expansion of the parison to eliminate the oblique downward stretching of the folds at the bottom of the parison,
[0045] 3) Preforming, applying clamping force in the mold clamping direction to realize pre-stretching of the parison in the mold clamping direction,
[0046] 4) Built-in components;
[0047] 5) Final shape.
[0048] The step 1) Extrude the parison, specifically as follows: 11) Cutting two pieces of parison, 12) Move the mold transfer shuttle car to the lower part of the blanking die to wait for material, at this time, the two pieces of parison are just located on the two sides and a half In the middle position between the mold and the preformed formwork, an expansion device is respectively provided on the bottom plates on both sides of the preformed formwork.
[0049] The step 2) parison expansion, ...
Embodiment 2
[0064] Example 2: see Figure 2-Figure 3 , an expansion device in the molding of a hollow box, an expansion device 4 is provided on both sides of the preformed template, and the expansion device 4 includes a W-shaped connecting rod 6, a driving cylinder 7, a V-shaped gripper 5, and a material clamping Cylinder 10, limit rod 9 and reset cylinder 8, the two sides of the W connecting rod 6 are respectively connected to the V-shaped gripper 5 through the clamping cylinder 10, the driving cylinder 7 is arranged above the reset cylinder, and the entire expansion device is fixed On the bottom plate of the preformed formwork, and through the structural design of the W-shaped connecting rod, it is guaranteed that it will not interfere with the closing of the mold. There are two expansion devices, which are located on both sides of the preformed formwork. In the expansion device, the W-shaped connecting rod The opening of W is variable. When the opening becomes larger, that is, W become...
Embodiment 3
[0065] Embodiment 3: see Figure 2-Figure 3 , as an improvement of the present invention, the V-shaped gripper 5 includes a handle 51 and a clamping portion 52, the two handles 51 and the clamping portion 52 are V-shaped as a whole, and the opening angle between the V-shaped grippers can be Adjustment, in order to prevent the parison from slipping after being clamped, the gripper should be provided with a larger contact area with the parison, and the handle is provided with anti-skid pits, in order to prevent the parison from sticking to the V-shaped On the handle, the surface of the handle is coated with polytetrafluoroethylene non-stick material or similar non-stick material. The expansion of the two parisons by the V-shaped clamp on the expansion device is not a simple plane stretching, but a three-dimensional stretching in space that can imitate the movement of the arm. On the one hand, it can provide an oblique downward pulling force to eliminate the wrinkles at the bott...
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