Metal mold gravity casting method

A technology of gravity casting and metal molds, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of casting risers and large machining allowances, slow filling speed, waste of materials, etc., and improve metal utilization The effect of reducing the machining allowance and improving the feeding effect

Inactive Publication Date: 2016-06-29
QINGDAO TAIWEI MACHINE TOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid metal is cast under the action of gravity, and the filling speed is slow, which can reduce the defects of air entrainment, but complex thin-walled castings will have insufficient pouring defects
The metal liquid naturally cools and shrinks in the mold, the structure of the casting is not fine and dense, and even shrinkage cavities and shrinkage defects appear, and the riser and machining allowance of the casting are large, which wastes materials
Taking the gravity casting production of electric bicycles and motorcycle wheels as an example, center casting is adopted, the center riser of the wheel hub is high, and the riser feeding is set on the edge of the wheel hub, so that the amount of molten aluminum casting is more than 1.5 times the actual casting demand, and the metal utilization low rate

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0010] Taking the gravity casting production of aluminum alloy wheels as an example, the specific implementation of a metal mold gravity casting method provided by the present invention is described in detail.

[0011] (1) After the metal mold is closed, the molten metal is gravity-cast into the mold, and the liquid level of the molten metal cannot exceed the minimum necking position of the sprue cup after casting.

[0012] (2) After the gravity casting is completed, the extrusion rod is used to squeeze the mold cavity vertically downward at the position of the sprue cup. After the extruding rod extends into the mold cavity, it maintains a constant extruding force until it can no longer move downward. The diameter of the lower end of the extruding rod is the same as the minimum constriction of the sprue cup 3, and the diameter of the middle end becomes larger, which is the same as the inner shape of the sprue cup, limiting the extent to which the extruding rod can extend into ...

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Abstract

The invention provides a metal mold gravity casting method. After molten metal is poured into a metal mold under gravity, an extrusion rod is used at the position of a mould pouring cup to carry out vertical downward extrusion on a mould cavity, and molten metal solidifies, flows and takes shape under pressure. Solidified metal is subjected to plastic deformation under pressure, so that a casting is free of defects, such as shrinkage cavity and shrinkage porosity, and is fine in structure. Mechanical properties are improved, risers and machining allowance are reduced, and metal utilizing rate is high.

Description

technical field [0001] The invention belongs to the field of metal mold gravity casting, and in particular relates to a casting method combining metal mold gravity casting and extrusion. Background technique [0002] Gravity casting refers to the process of injecting molten metal into the mold under the gravity of the earth. In a narrow sense, it mainly refers to metal mold casting, which is mainly used to produce medium and small castings of non-ferrous metals. The liquid metal is cast under the action of gravity, and the filling speed is slow, which can reduce the defects of air entrainment, but complex thin-walled castings will have insufficient pouring defects. The metal liquid naturally cools and shrinks in the mold, the structure of the casting is not fine and dense, and even shrinkage cavity shrinkage defects appear, and the riser and machining allowance of the casting are large, which wastes materials. Taking the gravity casting production of electric bicycles and m...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B22D27/11B22C9/06
Inventor秦海鹏
OwnerQINGDAO TAIWEI MACHINE TOOL