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Manufacturing method of sand core

A production method and sand core technology, which are applied in the directions of cores, manufacturing tools, casting and molding equipment, etc., can solve problems such as unsatisfactory effect and economy, and achieve the effects of strong heat storage capacity, avoidance of shrinkage porosity, and fast heat conduction.

Inactive Publication Date: 2019-11-12
CHONGQING HONGQI CYLINDER HEAD MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect and economy of the above two methods are not ideal under the production process conditions of our company.

Method used

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  • Manufacturing method of sand core
  • Manufacturing method of sand core
  • Manufacturing method of sand core

Examples

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Embodiment Construction

[0025] The core of this specific embodiment is to provide a sand core manufacturing method, which can avoid shrinkage around the cylinder head bolt holes and solve the current problems in this field.

[0026] Hereinafter, an embodiment will be described with reference to the drawings. In addition, the examples shown below do not limit the content of the invention described in the claims in any way. In addition, all the contents of the configurations shown in the following embodiments are not limited to be essential to the solution of the invention described in the claims.

[0027] The sand core manufacturing method provided in this specific embodiment includes step a): using chromite-coated sand to make a local sand core 1 in a region prone to shrinkage and porosity. Chromite has the characteristics of fast heat conduction and strong heat storage capacity. This method uses chromite sand to make sand cores that are prone to shrinkage, and obtains local sand cores 1, so that th...

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Abstract

The invention discloses a manufacturing method of a sand core. The manufacturing method comprises the step of (a) manufacturing a local sand core of an easy shrinkage area by adopting chromite coatedsand. Chromite has the characteristics of rapidity in heat conduction, high heat storage capacity and the like. According to the method, the sand core of the easy shrinkage area is manufactured by adopting chromite sand, the local sand core is obtained, and therefore, the shrinkage porosity around a bolt hole, which is made of the sand core, of a cylinder cover is avoided. Therefore, according tothe manufacturing method of the sand core, the shrinkage porosity around the bolt hole of the cylinder cover can be avoided, and the problem of the field at the present stage is solved.

Description

technical field [0001] The invention relates to the field of cylinder head manufacture, and more specifically, relates to a method for manufacturing a sand core of an engine cylinder head waterway sand core. Background technique [0002] At present, the casting cylinder head of our company is usually in the shape of iron mold covered with sand, and the flat casting and vertical pouring process, but the produced cylinder head is prone to shrinkage defects, especially around the bolt holes of the cylinder head. [0003] The shrinkage of the cylinder head is directly related to the sand core of the cylinder head. As far as the existing technology is concerned, there are two main methods to eliminate the shrinkage: one is to use risers to increase hot molten iron on the parts that are prone to shrinkage. The other is to use cold iron to quench the molten iron in the parts that are prone to shrinkage, so that the temperature of the molten iron at this place is consistent with the...

Claims

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Application Information

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IPC IPC(8): B22C9/10
CPCB22C9/103
Inventor 黄党怀邓浩张夏陈大元陈龙
Owner CHONGQING HONGQI CYLINDER HEAD MFG
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