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Large-scale thin-wall valve body lost foam casting process

A lost foam casting and thin-walled technology, which is applied in the manufacture of tools, casting molding equipment, casting molds, etc., can solve the problems of large thin-walled valve body lost foam casting deformation, etc., to avoid deformation, increase rigidity, and reduce scrap rate Effect

Inactive Publication Date: 2012-10-10
SHANXI MOFAN MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a large thin-walled valve body lost foam casting process, which can effectively overcome the technical problem of large thin-walled valve body lost foam casting deformation

Method used

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  • Large-scale thin-wall valve body lost foam casting process

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] A large thin-walled valve body lost foam casting process, which includes the following steps:

[0020] (1) Pre-expand polystyrene beads, pre-expand the beads of specifications P-S under the conditions of air pressure of 0.4MPa, steam temperature of 85°C, and foaming density of 24g / L;

[0021] ⑵Mature the polystyrene beads, keep the area of ​​the curing warehouse ventilated, and the curing time is 4 hours;

[0022] ⑶White mold forming, preheat the mold to 50°C, keep mold clamping, feeding, and steam pressure at 0.04MPa, and control the time at 70s. When designing the model, add cross ribs 5 in the flange hole, arrange vertically and horizontally, and prevent deformation The square section of the rib is 30mm×30mm;

[0023] ⑷White mold drying, drying the white mold at a temperature of 50°C;

[0024] (5) white mold combination, in the white mold square cavity after forming, make T-shaped rib 4 and I-shaped rib 1 with polystyrene foam material, the length of described T-sh...

Embodiment 2

[0032] A large thin-walled valve body lost foam casting process, which includes the following steps:

[0033] (1) Pre-expand polystyrene beads, pre-expand the beads of specifications P-S under the conditions of air pressure of 0.6MPa, steam temperature of 100°C, and foaming density of 26g / L;

[0034] ⑵Mature the polystyrene beads, keep the area of ​​the curing warehouse ventilated, and the curing time is 6 hours;

[0035] ⑶White mold forming, preheat the mold to 70°C, keep mold clamping, feeding, and steam pressure at 0.6MPa, and control the time at 120s. When designing the model, add cross ribs 5 in the flange hole, arrange vertically and horizontally, and prevent deformation The square section of the rib is 30mm×30mm;

[0036] (4) Drying of the white mold, drying the white mold at a temperature of 55°C;

[0037] (5) white mold combination, in the white mold square cavity after forming, make T-shaped rib 4 and I-shaped rib 1 with polystyrene foam material, the length of des...

Embodiment 3

[0045] A large thin-walled valve body lost foam casting process, which includes the following steps:

[0046] ⑴Pre-expand polystyrene beads, pre-expand the beads of specifications P-S under the conditions of air pressure of 0.5MPa, steam temperature of 90°C, and foaming density of 25g / L;

[0047] ⑵Mature the polystyrene beads, keep the area of ​​the curing warehouse ventilated, and the curing time is 5 hours;

[0048] ⑶White mold forming, preheat the mold to 60°C, keep mold clamping, feeding, and steam pressure at 0.3MPa, and control the time at 90s. When designing the model, add cross ribs 5 in the flange hole, arrange vertically and horizontally, and prevent deformation The square section of the rib is 30mm×30mm;

[0049] (4) Drying of the white mold, drying the white mold at a temperature of 52°C;

[0050](5) white mold combination, in the white mold square cavity after forming, make T-shaped rib 4 and I-shaped rib 1 with polystyrene foam material, the length of described...

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Abstract

The invention relates to a large-scale thin-wall valve body lost foam casting process, comprising the following steps of: (1) pre-foaming polystyrene beads; (2) curing the polystyrene beads; (3) moulding a white mould; (4) drying the white mould; (5) assembling the white mould; (6) brushing lost foam casting fireproof coating on the surface of the obtained white mould; (7) drying the white mould coated with the coating; (8) burying a box and compacting; (9) pouring molten iron; (10) insulating heat after pouring is finished, and then opening the box; and (11) cleaning off redundant anti-deformation ribs, and polishing and levelling by adopting a grinding wheel to obtain a thin-wall valve body. According to the process disclosed by the invention, when the white mould of the valve body is moulded, a cross-shaped rib which can prevent a round hole from deforming is additionally arranged in a flange hole, stiffness of the white mould is increased, deformation can be prevented; a T-shaped rib, an I-shaped rib and a diagonal tie rib are additionally arranged in an inner cavity of a square hole after assembling and adhesive bonding, an anti-deformation rib for a square opening is additionally arranged outside the square opening, and therefore deformation of the white mould after assembling is effectively overcome. When a casting is cleaned, the anti-deformation ribs inside and outside are removed, thus deformation of a workpiece is avoided and rejection rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of lost foam casting technology, and in particular relates to a large thin-walled valve body lost foam casting technology. Background technique [0002] The valve body is a thin-walled shell-shaped casting. The overall dimensions are 800mm×400mm×800mm in length×width×height. There is also a φ560mm flange hole on the large surface, and the total wall thickness is 12mm. In the past, sand casting was generally used. Wooden molds and core boxes need to be made, which consumes a lot of wood, and cores need to be made during modeling. The process is complicated, the wall thickness is not easy to guarantee, the scrap rate is high, and the production efficiency is low; Only need to use polystyrene foam beads, foam molding, make lost foam model, after combined bonding, brush refractory paint on the surface, dry, bury the box with dry sand, pour under negative pressure, and lose foam gasification However, because the...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 郭志刚吴昊靳文虎贾小俊杨丽
Owner SHANXI MOFAN MACHINERY MFG
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