Pouring process of vermicular graphite cast iron engine cylinder head

An engine cylinder head and process technology, applied in manufacturing tools, metal processing equipment, coatings, etc., can solve the problems of low dimensional accuracy of cylinder head blanks, easy deformation of castings, affecting cylinder head strength, etc., and achieve low thermal stress. , reduce deformation, good effect of thermal fatigue resistance

Inactive Publication Date: 2016-11-09
CHONGQING HONGQI CYLINDER HEAD MFG
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since the existing molds are mostly sand molds with weak rigidity, the castings are prone to deformation during pouring, resulting in low dimensional accuracy and insufficient compactness of the cylinder head blank, which in turn affects the strength of the cylinder head

Method used

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Embodiment Construction

[0019] The present invention is described in further detail below by way of specific implementation, and the concrete steps of this vermicular iron engine cylinder head pouring process are:

[0020] Step 1: Clamping and preheating the mold. The mold has a shape suitable for the inner contour of the iron sand box. Assemble the iron sand box and the mold and leave a gap in the middle to form a sand-covered cavity. The thickness of the sand-covered cavity is controlled at 3-8mm. , Use natural gas stove to heat iron sand box and mold for preheating, the temperature should be controlled at 180-250°C;

[0021] Step 2, add sand and harden: inject coated sand into the sand-coated cavity described in step 1, use a special sand-coating machine for the sand-shooting process, heat and dry the coated sand to harden and form a film, and form coated sand layer, the heating temperature should be controlled at 150-200°C.

[0022] Step 3, paint: Separate the mold and iron sand box after the co...

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Abstract

The invention relates to the technical field of metal casting, in particular to a pouring process of a vermicular graphite cast iron engine cylinder head. The pouring process comprises the following steps: assembling die for preheating, adding sand for hardening, coating, assembling a box, preparing pouring liquid, pouring, and taking an obtained casting. Compared with the prior art, the pouring process has the advantages that an iron sand box sand coating process is applied to casting of the vermicular graphite cast iron engine cylinder head, and as a rigid sand mold shell is obtained through sand-coating casting of the iron sand box, the overall strength of the sand mold is high to avoid deformation, deformation in the pouring process of the casting is reduced, the positioning is reliable, the precision is high, and the casting is more easily to demould.

Description

technical field [0001] The invention relates to the technical field of metal casting, in particular to a pouring process for vermicular iron engine cylinder heads. Background technique [0002] Vermicular cast iron, referred to as vermicular iron, means that the cast iron liquid has been treated with vermicularization so that the graphite in it is in the shape of worms and a small amount of pellets. If the vermicular treatment is excessive, the vermicular cast iron becomes nodular cast iron, and if the vermicularization is insufficient, it becomes gray cast iron. Since the shape of vermicular graphite is between flake and spherical, the mechanical properties of vermicular graphite iron are between gray cast iron and nodular cast iron, and its casting performance, vibration damping and thermal conductivity are better than that of nodular cast iron, which is different from that of gray cast iron. Similar to cast iron. Since vermicular graphite cast iron has the properties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22B22C3/00
CPCB22C9/02B22C3/00B22C9/22
Inventor 黄党怀
Owner CHONGQING HONGQI CYLINDER HEAD MFG
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