Nodular graphite cast iron crankshaft of diesel engine and its non-feedhead casting process

A technology of nodular cast iron and casting process, applied in the field of riserless casting process, can solve the problems of unstable casting quality, high worker danger, poor process operability, etc., and achieve good mechanical properties, improve economic benefits, and improve product quality. Effect

Active Publication Date: 2009-05-13
GUANGZHOU DIESEL ENGINE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The castings of the above casting process are prone to shrinkage and shrinkage defects at the root of the large riser, resulting in unstable c

Method used

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  • Nodular graphite cast iron crankshaft of diesel engine and its non-feedhead casting process
  • Nodular graphite cast iron crankshaft of diesel engine and its non-feedhead casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A riser-free casting process of a diesel engine nodular cast iron crankshaft includes the following steps:

[0044] (1) Molding steps: select dry mold sand as the molding material to fill in the casting mold cavity, and set up an L-shaped pouring system on the sand body of the dry mold sand corresponding to the main shaft and crankshaft of crankshaft 1, such as figure 1 , figure 2 As shown, and place the chilled iron 3 on the main shaft diameter part and the crankshaft diameter part of the crankshaft 1. The total weight of the chilled iron 3 is about 1530Kg. The gating system is composed of a sprue 5, a runner 6 and a plurality of internal runners 4. The sprue 5 and the cross runner 6 are connected, and a plurality of inner runners 4 are respectively arranged vertically with the cross runner 6 and respectively connected with the cross runner 6, and the sand body of the dry mold sand is also provided with 7 cold risers 3. The cross-sectional area ratio of the pouring system...

Embodiment 2

[0055] A riser-free casting process of a diesel engine nodular cast iron crankshaft includes the following steps:

[0056] (1) Mold modeling steps: select dry mold sand as the modeling material and fill it in the casting mold cavity, set up an L-type pouring system on the sand body of the dry mold sand corresponding to the main shaft and crankshaft of crankshaft 1, and The diameter of the main shaft and the diameter of the crankshaft 1 is placed with chilled iron 3. The total weight of chilled iron 3 is about 1530Kg. The gating system is composed of sprue 5, runner 6 and multiple internal runners 4, among which sprue 5 and The runner 6 is connected, and a plurality of inner runners 4 are respectively arranged vertically with the runner 6 and connected with the runner 6 respectively. The sand body of the dry mold sand is also provided with 7 cold risers 3, and the gating system is cut off. The area ratio is: A 内 : A 横 : A 直 85:160:60;

[0057] (2) Duplex smelting steps of ductile i...

Embodiment 3

[0067] A riser-free casting process of a diesel engine nodular cast iron crankshaft includes the following steps:

[0068] (1) Mold modeling steps: select dry mold sand as the modeling material and fill it in the casting mold cavity, set up an L-type pouring system on the sand body of the dry mold sand corresponding to the main shaft and crankshaft of crankshaft 1, and The diameter of the main shaft and the diameter of the crankshaft 1 is placed with chilled iron 3. The total weight of chilled iron 3 is about 1530Kg. The gating system is composed of sprue 5, runner 6 and multiple internal runners 4, among which sprue 5 and The runner 6 is connected, and a plurality of inner runners 4 are respectively arranged vertically with the runner 6 and connected with the runner 6 respectively. The sand body of the dry mold sand is also provided with 7 cold risers 3, and the gating system is cut off. The area ratio is: A 内 : A 横 : A 直 95:170:70;

[0069] (2) Duplex smelting steps of ductile i...

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Abstract

The invention discloses a diesel nodular cast iron crankshaft, which comprises the following components in mass percentage: 3.80 to 3.90 percent of w(C), 2.10 to 2.40 percent of w(Si), more than 0 and less than or equal to 0.30 percent of w(Mn), more than 0 and less than or equal to 0.060 percent of w(P), more than 0 and less than or equal to 0.020 percent of w(S), 0.60 to 0.80 percent of w(Cu), 0.20 to 0.30 percent of w(Mo), 0.020 to 0.040 percent of w(RE), 0.030 to 0.050 percent of w(Mg), and the balance being Fe. The nodular cast iron crankshaft can bear heavy load and constantly changing bending moment and torque actions, and has good mechanical property. The invention also provides a feederless casting process for the crankshaft, and cast parts produced by the casting process do not have the defect of shrinkage porosity at the root part and have reliable mechanical property and high yield.

Description

Technical field [0001] The invention relates to a diesel engine spheroidal graphite cast iron crankshaft. The spheroidal graphite cast iron crankshaft has good mechanical properties. The invention also relates to a riser-free casting process of the crankshaft. Background technique [0002] The crankshaft is one of the key components of the diesel engine, and its performance directly affects the life of the diesel engine. The crankshaft is subjected to heavy loads and constantly changing bending moments and torques during operation. The common failure modes are bending fatigue fracture and journal wear. Therefore, the crankshaft material is required to have high rigidity, fatigue strength and good wear resistance. With the development of spheroidal graphite cast iron technology, its performance is constantly improving. High-quality and cheap spheroidal iron has become one of the important materials for manufacturing crankshafts. It has convenient manufacturing, low cost, shock abs...

Claims

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Application Information

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IPC IPC(8): C22C37/10B22D25/02B22D27/00C21C7/064
Inventor 柯志敏关敏权李建辉李兆宁彭国强鲁仲华张征义
Owner GUANGZHOU DIESEL ENGINE FACTORY
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