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A process for preventing local weak sand mold from crushing in core assembly

A process method, sand mold technology, applied in the direction of core, casting mold, casting mold composition, etc., can solve problems such as poor metal structure, affecting core positioning accuracy, sand mold crushing, etc., to improve positioning accuracy and accuracy, The effect of eliminating the risk of crushing and solving the difficulty of assembly

Active Publication Date: 2015-09-09
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the part structure, shape and casting process design, there will be weak areas in the sand mold of the outer mold. The strength of these parts formed by the sand is not enough to bear the weight of the core, and the sand mold is crushed during the assembly of the box core. At the same time, the molding sand in the weak part will collapse in advance due to the influence of high temperature molten iron during the pouring process. This technical problem has a great impact on casting production and product quality
The usual method is to use materials with higher compressive strength, such as metal chilled iron, refractory bricks, etc., to be placed on the corresponding parts of the outer mold sand mold. Defective metal structure
[0003] So far, there is no way to overcome the above drawbacks

Method used

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  • A process for preventing local weak sand mold from crushing in core assembly
  • A process for preventing local weak sand mold from crushing in core assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A kind of process method that prevents local weak sand mold from collapsing in core assembly, such as figure 2 Shown: the method includes the following steps:

[0022] a. In the mold making stage, install positioning pins on the corresponding parts of the outer mold, and the positioning pins are metal pins of Φ3-5mm;

[0023] b. Make the metal support rod 2 weldment, the shape of the end is consistent with the appearance of the casting, drill a Φ3.5-5.5mm hole in the center, and weld some auxiliary support devices on the lower part of the support rod 2. The auxiliary support devices are in the place The lower part of the support rod 2 is welded with round steel, and the rib structure is welded between the round steel and the support rod. The number and shape of the auxiliary support devices are determined according to the shape of the corresponding area of ​​the casting and the weight of the core;

[0024] c. During the molding process, insert the above-...

Embodiment 2

[0026] Embodiment two: a kind of technological method that prevents local weak sand mold from collapsing in core assembly, such as figure 1 Shown: the method includes the following steps:

[0027] a. In the mold making stage, install positioning pins on the corresponding parts of the outer mold 1, and the positioning pins are metal pins of Φ3-5mm;

[0028] b. Make metal support rod welding parts, the shape of the end is consistent with the appearance of the casting, the center drills a Φ3.5-5.5mm hole, and welds some auxiliary support devices on the lower part of the support rod. The auxiliary support device is on the support The lower part of the rod 2 is welded with round steel, and the rib structure is welded between the round steel and the support rod. The number and shape of auxiliary support devices are determined according to the shape of the corresponding area of ​​the casting and the weight of the core;

[0029] c. During the molding process, insert the prepared meta...

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Abstract

The invention relates to a positioning and supporting method for weak sand core and sand mold in a sand mold cast core assembly, in particular to a process method for preventing crushing of a local weak sand mold in core assembly. The method comprises the following steps: mounting a positioning pin on a corresponding part of an outer mold at a mold manufacturing stage; manufacturing a metal supporting rod welding part; inserting the manufactured metal supporting rod to the positioning pin of the outer mold in a molding process, drawing and burying the supporting rod in the sand mold; during core assembly, nailing a core support with an iron nail for positioning in a pin hole of the metal supporting rod, wherein the manufacturing depth of the corresponding part of the core is 3-5 mm, the diameter is slightly greater than that of a positioning pit on the outer circle of the core support, and the core is supported according to the position. The process method is unique, guarantees the accuracy of core assembly and positioning, eliminates the crushing risk which probably occurs in the assembly and casting processes, improves the product quality and simplifies the operation.

Description

technical field [0001] The invention relates to a method for positioning and supporting weak sand cores and sand molds during the assembly process of sand mold cores, in particular to a process for preventing local weak sand molds from collapsing during core assembly. Background technique [0002] Castings with complex shapes and structures such as machine tools, internal combustion engines, and compressors are produced by sand casting technology, and the local structure is relatively thin. In the casting process design, the appearance and internal structure need to be formed through the assembly of the outer mold and the core. The sub needs to be supported and positioned by the core support. Due to the part structure, shape and casting process design, there will be weak areas in the sand mold of the outer mold. The strength of these parts formed by the sand is not enough to bear the weight of the core, and the sand mold is crushed during the assembly of the box core. At th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10
Inventor 周文军徐国强林艳茹陈洪涛张俊勇安少妮马秉平李艳琴
Owner KOCEL EQUIP
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