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Method for preparing iron mold sand-lined castings without rat tail defects

A technology for covering sand and defects in iron molds is applied in the field of preparing castings without rat tail defects, which can solve problems such as cracking and rat tail defects in castings.

Active Publication Date: 2014-09-03
齐齐哈尔英格机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the sand layer cracks when the molten metal rises to a certain height on the facade of a large iron mold in the existing technology, which leads to the problem of rat tail defects in castings, and provides a method for preparing iron molds without rat tail defects. Method for sand-covered castings

Method used

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  • Method for preparing iron mold sand-lined castings without rat tail defects
  • Method for preparing iron mold sand-lined castings without rat tail defects
  • Method for preparing iron mold sand-lined castings without rat tail defects

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specific Embodiment approach 1

[0017] Specific embodiment one: the method for preparing sand-coated iron mold castings without rat tail defects, specifically prepared according to the following steps:

[0018] 1. Set vertical grooves on the iron-shaped facade with a height of more than 40mm. The distance between the grooves is 25mm~30mm. The length of the lower bottom is 15mm~20mm, and the height is 3mm~4mm;

[0019] 2. Heat the pattern plate to 180°C~220°C, then fit the iron pattern with a temperature of 200°C~220°C onto the pattern plate, and send it to the sand shooting station to prepare for sand shooting;

[0020] 3. Align the sand-shooting hole of the sand-shooting head with the iron-shaped sand-shooting hole and press them tightly together to shoot the sand. The sand-shooting time is controlled to be 3s~5s / time;

[0021] 4. Move the iron mold and mold plate after sand shooting to the mold opening and closing station for curing. The curing time is controlled to be 1min~3min. When the coated sand turn...

specific Embodiment approach 2

[0024] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the length of the upper base is 32 mm to 38 mm, the length of the lower base is 16 mm to 19 mm, and the height is 3.2 mm to 3.8 mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, the length of the upper base is 35 mm, and the length of the lower base is 18 mm. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing iron mold sand-lined castings without rat tail defects, relating to a method for preparing castings without rat tail defects. The invention is designed for solving the problem that in the existing processes, castings have rat tail defects due to the occurrence of a cracking phenomenon on a larger vertical face of an iron mold when a sand layer rises to a certain height in a molten metal. The method comprises the following steps of: 1, improving the vertical face of an iron mold; 2, attaching the iron mold to a mold plate; 3, carrying out sand ejecting; 4, carrying out curing and die sinking; and 5, pouring molten iron. The vertical face of a casting prepared by using the method disclosed by the invention has no rat tail defects. The method disclosed by the invention is used for preparing iron mold sand-lined castings without rat tail defects.

Description

technical field [0001] The present invention relates to a method of producing castings free of rat tail defects. Background technique [0002] Sand-covered iron casting refers to a casting process in which a thin layer of sand is covered in the inner cavity of a metal mold (iron mold) to form a mold. During the pouring process of this process, due to the difference in heat transfer speed between the molding sand and the iron mold, the sand layer will expand and crack due to heat conduction problems. In most cases, this situation is not obvious because the pouring speed is greater than the heat transfer speed, but the larger facade sand layer will crack when the molten metal rises to a certain height, and the casting will produce similar Rat tail defect. Contents of the invention [0003] The invention aims to solve the problem that the sand layer cracks when the molten metal rises to a certain height in the existing technology on the facade with a large iron mold, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/06
Inventor 王德军
Owner 齐齐哈尔英格机械有限公司
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