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A method for preparing formwork with controllable heat dissipation conditions

A mold shell and condition technology, applied in the fields of investment casting and precision casting, can solve problems such as the control of local heat dissipation conditions that cannot be cast, and achieve the effect of simple and convenient operation.

Active Publication Date: 2022-05-06
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current mold shell preparation method cannot realize the control of the local heat dissipation conditions of the casting

Method used

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  • A method for preparing formwork with controllable heat dissipation conditions
  • A method for preparing formwork with controllable heat dissipation conditions
  • A method for preparing formwork with controllable heat dissipation conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The method for preparing a formwork with controllable heat dissipation conditions in this embodiment, the steps are as follows:

[0046] Step 1: Prepare a wax model; as figure 1 shown;

[0047] Step 2: Prepare the slurry and sand materials required for the formwork, and complete the preparation of the first three layers of formwork (n represents the number of layers of the final formwork, n=7), such as figure 2 Shown; prepare the hollow part in the 4th layer;

[0048] Step 3: At the position where the heat dissipation condition needs to be adjusted, stick a profiling wax block 2 corresponding to the adjusted position, the upper end of the profiling wax block 2 has a drainage tube 1, and the opening direction of the drainage tube 1 is consistent with the mold shell preparation The dewaxing direction of the wax block 2 in the process is consistent (so that the wax block is removed), such as image 3 shown;

[0049] The drainage tube extends beyond the design position...

Embodiment 2

[0059] The method for preparing a formwork with controllable heat dissipation conditions in this embodiment, the steps are as follows:

[0060] Step 1: Prepare a wax model;

[0061] Step 2: Prepare the slurry and sand required for the formwork, and complete the preparation of the first 4 layers of formwork (n represents the number of layers of the final formwork, n=8); prepare the hollow part on the fifth layer;

[0062] Step 3: At the position where the cooling conditions need to be adjusted, paste a profiling foam block of the corresponding shape to the adjusted position. The upper end of the profiling foam block has a drainage tube, and the foam block does not need to be removed through the drainage tube. The shell pre-baking stage is completely roasted, and the drainage tube is used for vacuuming or filling with materials with different thermal conductivity from the mold shell after the mold shell is prepared. There is no special requirement for the opening direction.

[...

Embodiment 3

[0072] The method for preparing a formwork with controllable heat dissipation conditions in this embodiment, the steps are as follows:

[0073] Step 1: Prepare a wax model;

[0074] Step 2: prepare the slurry and sand material required for the formwork, and complete the preparation of the first 4 layers of formwork (the number of layers of the final formwork, n=7); prepare the hollow part on the fifth layer;

[0075] Step 3: At the position where the heat dissipation condition needs to be adjusted, paste a copy wax block corresponding to the adjusted position, the upper end of the copy wax block has a drainage tube, and the opening direction of the drainage tube is consistent with the mold shell preparation process The dewaxing direction of the wax block in the tube is consistent (the direction of the opening of the drainage tube is consistent with the direction of gravity, so that the wax block can be removed);

[0076] The drainage tube extends beyond the design position of...

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Abstract

The invention discloses a method for preparing a formwork with controllable heat dissipation conditions. On the part of the formwork that needs to be adjusted for heat dissipation conditions, a profiling low-ignition substance of a shape corresponding to the adjusted position is pasted. The upper end of the profiling low-ignition substance has a There is a drainage tube; after the mold shell is prepared, the profiling low-flammability substance is removed to form a corresponding hollow part, and the hollow part is vacuumed or filled with materials with different thermal conductivity through the drainage tube to control the thermal conductivity of the corresponding position. The invention is simple and convenient to operate. For the thin-walled area of ​​the casting, the heat transfer coefficient can be small and the heat dissipation slow, so as to ensure that the casting is not under-cast and columnar crystals caused by temperature gradients are not generated. For the relatively thick part of the casting and the area where the hot joint is prominent, the heat transfer coefficient can be made large and the heat dissipation can be fast, so as to avoid the looseness of the casting at this place.

Description

technical field [0001] The invention belongs to the fields of precision casting and investment casting, and in particular relates to a mold shell preparation method with controllable heat dissipation conditions. Background technique [0002] In the field of investment precision casting, mold shell preparation is one of the key processes in casting molding in precision casting, and the quality of the mold shell determines the quality of the casting to a certain extent. As a cavity for receiving high-temperature molten metal in investment precision casting, the mold shell not only determines the size of the casting, but also has a great influence on the metallurgical quality of the casting. [0003] The current method of preparing the mold shell is to prepare the mold shell evenly. The overall thickness of the mold shell is obtained by dipping the wax mold with slurry and sanding, but this uniform overall thickness of the mold shell cannot meet the heat dissipation requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C9/12B22D27/04
CPCB22C9/04B22C9/12B22D27/04
Inventor 郑行蒋明喻石亚侯正乾金天文雷四雄王玉雷张霞李静陈婷婷游银根
Owner CHINA HANGFA SOUTH IND CO LTD
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