Casting process for hydraulic main control valve blank

A casting process and main control valve technology, applied in manufacturing tools, casting molding equipment, casting molds, etc., can solve problems such as shrinkage porosity, out of tolerance, broken core, etc., to reduce the impact of dimensional changes, enter the cavity smoothly, Small washout effect

Pending Publication Date: 2014-08-06
SHANDONG CHANGLIN MACHINERY GRP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Defects such as shrinkage porosity, broken core, and size out-of-tolerance are prone to occur during production

Method used

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  • Casting process for hydraulic main control valve blank
  • Casting process for hydraulic main control valve blank

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Experimental program
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Embodiment Construction

[0025] The detailed description and technical content of the present invention are described below with the accompanying drawings, but the accompanying drawings are only provided for reference and description, and are not intended to limit the present invention.

[0026] like Figure 1-2 As shown, the blank casting process of the hydraulic main control valve includes the steps of: selecting the molding sand used in the pouring system, and the molding sand is resin sand; using resin sand to construct the sand casting cavity of the hydraulic main control valve blank; Pouring, then cooling naturally and breaking out of the finished product.

[0027] The sand casting cavity includes a main cavity and a runner, the runner communicates with the main cavity, and there are at least two thermal insulation risers 5 on the main cavity. The sprue includes a sprue 1, a runner 3, and an ingate 4, the sprue is arranged vertically, and is connected to the runner and the ingate in sequence, a...

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Abstract

The invention discloses a casting process for a hydraulic main control valve blank. The process comprises the following steps: selecting molding sand used by a pouring system, wherein the molding sand is resin sand; constructing a sand mold casting cavity of the hydraulic main control valve blank by the resin sand; pouring into the sand mold casting cavity; and breaking a mold to obtain the finished product after cooling naturally. According to the casting process, the defects that a hydraulic main control valve blank is likely to contract, a core is easily broken, the size is out of tolerance and the like in the production in the prior art are overcome. The resin sand mold can effectively alleviate the size change influence caused by the expansion and the contraction of molten iron. Meanwhile, the appearance quality of a casting is greatly improved. By virtue of bottom casting, the molten iron enters the mold cavity smoothly; the core and the mold cavity are eroded slightly; meanwhile, the turbulent flow is avoided; gas and dregs are prevented from being involved in. A heat insulation riser is used at a contraction position; the casting yield is improved from 60 percent to 72 percent.

Description

technical field [0001] The invention relates to a casting process, in particular to a blank casting process of a hydraulic main control valve. Background technique [0002] Excavators are widely used in engineering construction fields such as roads, bridges, buildings, underground engineering and emergency excavation. It is characterized by high strength and high efficiency. The control valve is its key part. Due to the high complexity of the internal oil passage of the control valve and the high oil pressure, the valve body castings are required to have high mechanical properties, compact structure and strict dimensional accuracy. At present, this Multi-way valves mainly import finished products from abroad, and there are few domestic units that can stably mass-produce and meet the quality requirements of castings. [0003] The material of the 22-ton series excavator multi-way valve is QT500-7, the mass is 82Kg, and the overall size is 365mm×265mm×165mm. The valve body is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08B22C9/22
Inventor 钟默张为哲高公如李兵泽柏建雨朱海军张学春刘璐
Owner SHANDONG CHANGLIN MACHINERY GRP
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