Preparation method for hollow sand core, production mould for same and production device for same
A kind of hollow sand core, technology of production device
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[0029] In a typical embodiment of the present invention, a method for preparing a hollow sand core is provided, comprising the following steps: A. placing a retractable air bag 12 matching the shape of the inner wall of the hollow sand core 111 in the preparation of the hollow sand core; In the inner cavity of the mold core box 11 for the core, the retractable airbag 12 is inflated for the first time to form the first inflated state. In the first inflated state, the outer surface of the expandable airbag 12 and the inner surface of the mold core box 11 A sand filling part is formed between the cavity surfaces; B. Filling the sand filling part with core sand; C. Forming and solidifying the core sand to form a hollow sand core; D. Pumping the expandable airbag 12 to form a contracted state , and take out the expandable air bag 12; E. Open the mold core box 11 to obtain a hollow sand core 111.
[0030] The preparation method of the hollow sand core provided by the present inventi...
Embodiment 1
[0047] Preparation device: such as Figure 1 to Figure 2 As shown, the preparation device includes a core box 11 and an air bag 12. The air bag 12 has an inflatable nozzle 13 positioned at the core head position of a hollow sand core 111. The inflatable nozzle 13 is fixed on the core box 11 by a positioning device 18. The inflatable nozzle 13 is connected to the core Sand filling holes 110 are formed between the boxes 11 . The production device further includes a vacuum pump 17, an air compressor 16, and a three-way valve 15, wherein the first end of the three-way valve 15 is connected to the air extraction device 17, the second end is connected to the inflation device 16, and the third section is 14 links to each other with the inflation nozzle 13 of air bag.
[0048] Process steps:
[0049] 1. Make a core box according to the shape and size of the sand core to be prepared, as shown in 11.
[0050] 2. According to the shape of the sand core to be made, the inflatable rubbe...
Embodiment 2
[0058] Production equipment: such as Figure 1 to Figure 2 As shown, the production device includes a core box 11 and an air bag 12. The air bag 12 has an inflatable nozzle 13 positioned at the core head position of a hollow sand core 111. The inflatable nozzle 13 is fixed on the core box 11 by a positioning device 18. The inflatable nozzle 13 is connected to the core Sand filling holes 110 are formed between the boxes 11 . The production device further includes a vacuum pump 17, an air compressor 16, and a three-way valve 15, wherein the first end of the three-way valve 15 is connected to the air extraction device 17, the second end is connected to the inflation device 16, and the third section is 14 links to each other with the inflation nozzle 13 of air bag.
[0059] Process steps:
[0060] 1. Make a core box according to the shape and size of the sand core to be prepared, as shown in 11.
[0061] 2. According to the shape of the sand core to be made, the inflatable rubb...
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