Foundry process of multiway valve casting

A casting process and multi-way valve technology, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of hydraulic valves not working stably, large wear, valve body leakage, etc. The effect of high rate and high precision

Inactive Publication Date: 2018-02-23
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The hydraulic valve is a key component of the hydraulic system. The hydraulic valve structure and precision requirements of large excavators are very high, especially for some valves with multiple oil circuits, the temperature rises rapidly during the working process, and the temperature is too high, causing the hydraulic valve to not work stably. , and the amount of wear is large, the pressure pulsation or impact vibration of the hydraulic system will cause the valve body to leak, and it is easier to leak under the high-pressure working state with a pressure ≥ 35Mpa. The hydraulic valve body casting shrinkage cavity, shrinkage porosity, internal pores, etc. The problem is often a defect of the product, requiring higher internal structure compactness and the straightness of the main valve hole casting blank is less than 1.0mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A casting process for a multi-way valve casting, comprising the following steps:

[0019] (1) Mold making: prepare the core mold, check the mold and clean the dirt on the mold;

[0020] (2) Production of main core and small core: use molding sand to make main core and small core, and use steel material as core bone; small core and main core are assembled together by adhesive;

[0021] (3) Molding: use molding sand to make the shell mold, fill the mold with the molding sand through the core shooter, heat and solidify the molding sand at a temperature of 80-100°C, and then get the casting mold for use;

[0022] (4) Pouring: preheat the mold obtained after molding, the preheating temperature is 80-100°C, then spray heat-resistant agent on the inner surface of the preheated mold, and then cast the sprayed mold Mold heat preservation, the heat preservation temperature is 200-280°C, the heat preservation time is 10-20 minutes, and then the pouring liquid is injected into the...

Embodiment 2

[0028] A casting process for a multi-way valve casting, comprising the following steps:

[0029] (1) Mold making: prepare the core mold, check the mold and clean the dirt on the mold;

[0030] (2) Production of main core and small core: use molding sand to make main core and small core, and use steel material as core bone; small core and main core are assembled together by adhesive;

[0031] (3) Molding: use molding sand to make the shell mold, fill the mold with the molding sand through the core shooter, heat and solidify the molding sand at a temperature of 80-100°C, and then get the casting mold for use;

[0032] (4) Pouring: preheat the mold obtained after molding, the preheating temperature is 80-100°C, then spray heat-resistant agent on the inner surface of the preheated mold, and then cast the sprayed mold Mold heat preservation, the heat preservation temperature is 200-280°C, the heat preservation time is 10-20 minutes, and then the pouring liquid is injected into the...

Embodiment 3

[0039] A casting process for a multi-way valve casting, comprising the following steps:

[0040] (1) Mold making: prepare the core mold, check the mold and clean the dirt on the mold;

[0041] (2) Production of main core and small core: use molding sand to make main core and small core, and use steel material as core bone; small core and main core are assembled together by adhesive;

[0042] (3) Molding: use molding sand to make the shell mold, fill the mold with the molding sand through the core shooter, heat and solidify the molding sand at a temperature of 80-100°C, and then get the casting mold for use;

[0043] (4) Pouring: preheat the mold obtained after molding, the preheating temperature is 80-100°C, then spray heat-resistant agent on the inner surface of the preheated mold, and then cast the sprayed mold Mold heat preservation, the heat preservation temperature is 200-280°C, the heat preservation time is 10-20 minutes, and then the pouring liquid is injected into the...

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Abstract

The invention discloses a foundry process of a multiway valve casting. The foundry process comprises the steps of mold making, main core and small core making, modeling, pouring and cleaning inspecting. The main core and small core making step comprises the concrete steps of using foundry sand to make a main core and a small core; using a steel material as core bars; and assembling the main core and the small core together through a binding agent. The pouring step comprises the concrete steps of preheating a casting mold obtained after modeling, wherein the preheating temperature is 80-100 DEGC; then, spraying a heat resistant agent on the inner surface of the preheated casting mold; conducting heat preservation for the sprayed casting mold, wherein the heat preservation temperature is 200-280 DEG C, and the heat preservation time is 10-20 minutes; and finally, pouring pouring liquid into a mold cavity. By preheating and spraying of the heat resistant agent, the casting mold has strong flexibility and is not easy to break in the pouring process, and meanwhile, the uniform pouring and cooling is ensured. Thus, the obtained casting is not easy to produce shrinkage cavities, shrinkage porosity and internal porosity.

Description

technical field [0001] The invention relates to a casting process of a multi-way valve casting, which belongs to the technical field of valve body castings. Background technique [0002] A multi-way valve is a combination of more than two valve blocks to manipulate the movement of multiple actuators. Because it can combine various valves according to the requirements of different hydraulic systems, it has compact structure, simple pipeline, small pressure loss and convenient installation, so it is widely used in construction machinery, lifting and transportation machinery and other required operations. A mobile machine that moves with multiple actuators. [0003] The hydraulic valve is a key component of the hydraulic system. The hydraulic valve structure and precision requirements of large excavators are very high, especially for some valves with multiple oil circuits, the temperature rises rapidly during the working process, and the temperature is too high, causing the hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C1/02B22C9/10B22C9/24
CPCB22C3/00B22C1/02B22C9/103B22C9/24
Inventor 浦巧生管宪德朱兴明姚庆华
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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