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Method for casting copper alloy butterfly valve plate

A technology of copper alloy and disc valve, which is applied in the field of valve plate casting, can solve problems such as uneven wall thickness, insecure quality, and imperfect technology

Active Publication Date: 2014-07-02
浙江元鼎船舶设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are three domestic casting processes for copper alloy disc valve plates: horizontal casting: simple operation and uneven wall thickness, so the quality is absolutely not guaranteed; oblique casting: the quality will be improved compared with horizontal casting, but only 30% can be solved quality problems; vertical pouring: the best quality, some factories also use it, but the process is not very perfect, there are many deficiencies, mainly manifested as shrinkage porosity and slag holes

Method used

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  • Method for casting copper alloy butterfly valve plate
  • Method for casting copper alloy butterfly valve plate
  • Method for casting copper alloy butterfly valve plate

Examples

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Embodiment

[0033]Embodiment: The copper alloy disc valve plate casting method of this example, the pouring weight of this piece is 800KG, and the pouring temperature is 1165-1170°C, such as figure 1 , whose steps are:

[0034] a. Castings are molded by resin sand real sample wood mold, such as figure 2 , image 3 Place the mud core 2 in the sand box 1, the lower end of the mud core is provided with the first cold iron 26, the second cold iron 27, the middle part of the mud core is distributed with the third cold iron 28, the fourth cold iron 29, the mud core The upper end of is provided with the fifth cold iron 30, and all cold irons are separated in half, stays 3mm interval in the middle, puts chrome ore at the interval after the two half cold irons are closed. The inner ring of the cavity of the sand box is provided with a slag collection groove 24 and an exhaust groove 25. The mud core is suspended by two T-shaped mud core heads 3. The mud core forms the shape of the inner wall of...

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Abstract

The invention relates to a method for casting a valve plate, and particularly relates to a method for casting a copper alloy butterfly valve plate, aiming at mainly solving the technical problems of shrinkage porosity and slag eye generation when vertical casting of the copper alloy butterfly valve plate is adopted in the prior art. The method comprises the following steps: firstly, plugging a graphite drawing plug for preparation, pouring copper water in a baffle-type pouring cup, then pulling the plug so that copper water enters a mold cavity of a casting body through a gate sprue, a U-shaped gate sprue base, a steel plate filter screen, a ceramic filter screen, a transverse sprue and a flow gate, turning a pouring ladle to a dead head sprue when the copper liquid flows to a position higher than the casting body by 80mm, covering with a heat preservation exothermal agent immediately after casting, loosening screws 10 hours after the casting to release part stress, and opening the box 20 hours after the casting to obtain the copper alloy butterfly valve plate.

Description

technical field [0001] The invention relates to a casting method for a valve plate, in particular to a casting method for a copper alloy disc valve plate. Background technique [0002] The application field of copper alloy butterfly valve plate is very broad, mainly used in shipbuilding, oil and gas pipeline engineering, etc., but the quality of the product is not optimistic, mainly for the failure of pressure test, large deviation of wall thickness, many casting defects, etc. These The faults have not been completely improved, and the only customers with high requirements are Enai imported from abroad. Copper alloy butterfly valve plate casting technology is difficult, first: this product is a thin-walled part; second: the wall thickness difference of the product is relatively large, and fourth: this casting is a typical special-shaped thin-walled part. There are three domestic casting processes for copper alloy disc valve plates: horizontal casting: simple operation and u...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22C9/08B22C9/10B22D1/00
Inventor 彭祥龙傅建良
Owner 浙江元鼎船舶设备有限公司
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