Casting system capable of eliminating detects of ZG35 valve casting and design method thereof

A casting defect, ZG35 technology, applied in casting molding equipment, casting mold, casting mold composition, etc., can solve the problems of metal material waste, complex structure, casting cracks, etc., to eliminate local cracks, improve mechanical properties, and eliminate shrinkage cavities. Effect

Pending Publication Date: 2017-09-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the structure of valve parts is complex. When using sand casting method to cast valves, if the design of the gating system and the setting of process parameters are improper, it is easy to cause defects such as cracks, shrinkage porosity, and shrinkage cavities in the castings.
The casting blank of the valve body is not allowed to have casting defects such as sand holes, cracks, shrinkage cavities and pores, and because the valve castings are all medium and large castings, metal materials cannot be wasted.

Method used

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  • Casting system capable of eliminating detects of ZG35 valve casting and design method thereof
  • Casting system capable of eliminating detects of ZG35 valve casting and design method thereof
  • Casting system capable of eliminating detects of ZG35 valve casting and design method thereof

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Embodiment Construction

[0040] Specific examples of the present invention are given below. The specific embodiments are only used to further describe the present invention in detail, and do not limit the protection scope of the claims of the present application.

[0041] Figure 1-3 It is an existing technology. The gating system in the prior art mostly adopts a multi-runner ladder type. A large arc-shaped runner and 15 inner runners are arranged at the upper and lower flanges of the valve casting, and the intention is to use the inner runner. The mouth feeds the thick flanges at the top and bottom of the casting, and achieves the purpose of sequential filling from bottom to top, but the casting system has serious cracks due to the network gating system.

[0042] Depend on figure 1 It can be seen that at this moment, the casting body is still not solidified, but the gating system has been solidified, which makes the casting body be hindered by the gating system and cause stress when it solidifies a...

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Abstract

The invention discloses a casting system capable of eliminating detects of a ZG35 valve casting and a design method thereof. The casting system comprises risers, a gating system and a chilling block. The gating system adopts a step-type gating system and comprises a sprue cup, a straight gate, a bottom layer ingate and an upper layer ingate. The sprue cup is used for pouring of molten metal liquid and connected with the straight gate. The straight gate is connected with the bottom layer ingate and the upper layer ingate. The chilling block is arranged at a hot spot at the bottom of the casting. The risers comprise the top risers and the side riser. The top risers are arranged over a flange on the top of the casting, and the side riser is arranged on the side face of a flange at the bottom of the casting. According to the casting system, the defects of shrinkage, dispersed shrinkage and cracking of the ZG35 valve casting can be effectively eliminated, the rate of finished products is increased, and mechanical performance of the ZG35 valve casting is improved.

Description

technical field [0001] The invention relates to the technical field of steel casting technology, in particular to a casting system and a design method thereof for eliminating defects of ZG35 valve castings. Background technique [0002] Casting production is a production method of molten metal forming. The process of forming metal products after molten metal enters the mold after cooling and solidification is called casting production, referred to as casting. The metal products produced are called castings. The vast majority of castings are used as blanks and need to be machined before they can become various machine parts; a few castings that meet the requirements of dimensional accuracy and surface roughness can be used directly as finished products or parts. [0003] Chen Fei and Cao Haiping mentioned in an article "Common Defects and Evaluation of Valve Appearance" that valves are prone to defects such as cracks, shrinkage cavities, and sand holes during the casting pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08B22D15/00B22D27/04
CPCB22C9/082B22C9/088B22D15/00B22D27/04
Inventor 李日宫雷张清贞
Owner HEBEI UNIV OF TECH
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