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, to achieve the effect of enhancing air permeability and heat dissipation, high rigidity, and strengthening the inoculation process

Active Publication Date: 2010-10-13
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 casting quality and high rejection rate, and the process operation Poor safety, high risk for workers, large space occupation, long production cycle

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A riser-free casting process for a diesel engine nodular cast iron crankshaft, comprising the steps of:

[0046] (1) Mold molding step: choose 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 the crankshaft of the crankshaft 1, such as figure 1 , figure 2 As shown, and the cold iron 3 is placed on the main shaft diameter part and the crankshaft diameter part of the crankshaft 1, the total weight of the cold iron 3 is about 1530Kg, and the pouring system is composed of a sprue 5, a runner 6 and a plurality of ingates 4, wherein The sprue 5 is connected to the runner 6, and a plurality of ingates 4 are arranged vertically to the runner 6 and respectively connected to the runner 6. There are also 7 cold risers on the sand body of the dry mold sand 3. The cross-sectional area ratio of the pouring system is: A 内 :A 横 :A 直 80:150:50; ...

Embodiment 2

[0057] A riser-free casting process for a diesel engine nodular cast iron crankshaft, comprising the steps of:

[0058] (1) Mold molding step: choose dry mold sand as the molding material and fill it in the casting mold cavity, set up an L-shaped pouring system on the sand body of the dry mold sand that is arranged at a position corresponding to the main shaft and the crankshaft of the crankshaft 1, and The main shaft diameter part and the crankshaft diameter part of the crankshaft 1 place the cold iron 3, and the total weight of the cold iron 3 is about 1530Kg. The runner 6 is connected, and a plurality of inrunners 4 are vertically arranged with the runner 6 respectively, and are respectively connected with the runner 6. There are also 7 cold risers 3 on the sand body of the dry mold sand, and the pouring system cuts The area ratio is: A 内 :A 横 :A 直 It is 85:160:60;

[0059] (2) Duplex smelting steps of ductile iron:

[0060] (2) Put pig iron, waste nodular cast iron an...

Embodiment 3

[0069] A riser-free casting process for a diesel engine nodular cast iron crankshaft, comprising the steps of:

[0070] (1) Mold molding step: choose dry mold sand as the molding material and fill it in the casting mold cavity, set up an L-shaped pouring system on the sand body of the dry mold sand that is arranged at a position corresponding to the main shaft and the crankshaft of the crankshaft 1, and The main shaft diameter part and the crankshaft diameter part of the crankshaft 1 place the cold iron 3, and the total weight of the cold iron 3 is about 1530Kg. The runner 6 is connected, and a plurality of inrunners 4 are vertically arranged with the runner 6 respectively, and are respectively connected with the runner 6. There are also 7 cold risers 3 on the sand body of the dry mold sand, and the pouring system cuts The area ratio is: A 内 :A 横 :A 直 It is 95:170:70;

[0071] (2) Duplex smelting steps of ductile iron:

[0072] (2a) Put pig iron, waste nodular cast iron a...

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PUM

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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 nodular cast iron crankshaft of a diesel engine. The nodular cast iron crankshaft has good mechanical properties. The invention also relates to a riserless 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 ductile iron technology, its performance is also constantly improving. High-quality and cheap ductile iron has become one of the important materials for manufacturing crankshafts. It has the advantages of convenient manufacture, low cost, shock absorption, wear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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