Technology for manufacturing diesel engine cast steel intermediate

A technology for intermediates and diesel engines, which is used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of shrinkage cavities and shrinkage porosity in casting intermediates, easy to generate thermal cracks, not enough environmental protection and economical, and shorten the trial production. effect of cycle, increased strength and stiffness, and improved product surface quality

Inactive Publication Date: 2018-12-04
全椒县全动机械有限公司
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Problems solved by technology

In the existing manufacturing process of diesel engine cast steel intermediates, the intermediate castings are prone to large shrinkage stress and thermal cracks during the solidification process. Some manufacturing processes of diesel engine cast steel intermediates adopt control of molten steel pouring temperature and increase The overall concession is used to reduce the shrinkage stress and reduce the occurren

Method used

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  • Technology for manufacturing diesel engine cast steel intermediate

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Example Embodiment

[0032] In order to make the technical means, the purpose and the effect of the invention easy to understand, the invention will be further explained below in conjunction with specific embodiments.

[0033] A manufacturing process of a diesel engine cast steel intermediate includes the following steps:

[0034] Step 1: Mold manufacturing

[0035] According to the design drawing of the cast steel intermediate drawn in CAM technology, the core box, molding sand and sand core are manufactured according to the design drawing, and then the core box, molding sand and sand core are assembled to form a mold;

[0036] Step 2: Melting and pouring

[0037] Put the cast steel material into the electric arc furnace for smelting process to make a metal liquid, then slowly pour the metal liquid into the mold for 20 minutes, then fast pouring for 20 minutes, when the metal liquid reaches the upper riser, slowly pouring again for 10 minutes. Casting, water cooling is performed after casting, melting tre...

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Abstract

The invention provides a technology for manufacturing a diesel engine cast steel intermediate. The technology comprises the following steps: die manufacturing, smelting and pouring, demolding and shaking treatment, trimming, surface polishing treatment, heat treatment, rough milling processing and rough grinding processing, and finishing milling processing and finish grinding processing. The heattreatment can improve the physical properties of the cast steel intermediate, so the strength and the rigidity of the cast steel intermediate are improved, and the cast steel intermediate is not easily deformed, and has no shrinkage stress or hot cracks. Compared with the traditional cast steel intermediate processing technologies, the manufacturing technology of the invention has the advantages of avoiding of using a large amount of water, simple and easily implemented process, effective improvement of the product quality, shortening of the trial production cycle, saving of the production cost, and realization of improvement of the surface quality of the product and ensuring of no flaws on the surface of an intermediate blank through removing molding sands and excess metals residual on the intermediate blank by shaking treatment.

Description

technical field [0001] The invention relates to the field of diesel engine manufacturing, in particular to a manufacturing process for a diesel engine cast steel intermediate. Background technique [0002] Diesel engine cast steel intermediate is one of the key components of marine low-speed and high-power diesel engines. In the existing manufacturing process of diesel engine cast steel intermediates, the intermediate castings are prone to large shrinkage stress and hot cracks during the solidification process. Some manufacturing processes of diesel engine cast steel intermediates adopt control of molten steel pouring temperature and increase The overall concession is used to reduce the shrinkage stress and reduce the occurrence of cracks. However, due to the late solidification of the hot joints of the intermediate castings, the casting intermediates are still prone to shrinkage cavities and shrinkage porosity, forming crack sources. At the same time, some cast steel interm...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22D31/00C21D1/00
Inventor 尤建国
Owner 全椒县全动机械有限公司
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