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Casting technology for three-stage planetary frame of ocean platform climbing machine

A three-stage planetary and ocean platform technology, applied in the field of metal casting, can solve problems such as high dimensional accuracy, high surface quality requirements, high smelting process and operation difficulty, and difficulty in ensuring the internal quality of castings, achieving good fluidity and improving dimensional stability. Performance and mechanical properties, the effect of improving internal quality

Active Publication Date: 2014-12-03
CHANGSHU HONGQIAO CAST STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the analysis of technical requirements, materials, and structural characteristics, the production of planetary carriers mainly has the following difficulties: castings are high-strength structural steel, and the smelting process and operation are very difficult; fatal defects such as cracks, pores, and sand holes are prone to occur during the casting process; internal quality of castings It is difficult to guarantee; the material is medium-carbon high-strength alloy steel, and the heat treatment process is very critical; the requirements for dimensional accuracy and surface quality are high

Method used

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  • Casting technology for three-stage planetary frame of ocean platform climbing machine
  • Casting technology for three-stage planetary frame of ocean platform climbing machine
  • Casting technology for three-stage planetary frame of ocean platform climbing machine

Examples

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Effect test

Embodiment 1

[0034] A casting process for a three-stage planetary frame of an offshore platform climber, the material of the casting of the three-stage planetary frame of the offshore platform climber is ZG35Gr1Mo, and the processing steps include:

[0035] (a) Molten steel smelting: putting the ZG35Gr1Mo material into an electric arc furnace to smelt into molten steel;

[0036] (b) Casting process: resin sand molding, casting 2 pieces at the same time in one box;

[0037] Set up the pouring system, install the riser, and place the cold iron according to the above steps, and pour molten steel through the pouring system in a vertical pouring manner. At 1 / 2 of the height of the mouth, add 3kg of vermiculite into each riser. After the pouring is completed, the casting is kept in the sand mold for 48 hours, and then the riser is separated by air after sand cleaning. Casting gross weight 500×2kg;

[0038] (c) Normalizing + tempering pretreatment: Put the castings prepared above into a heating...

Embodiment 2

[0041] A casting process for a three-stage planetary frame of an offshore platform climber, the material of the casting of the three-stage planetary frame of the offshore platform climber is ZG35Gr1Mo, and the processing steps include:

[0042] (a) Molten steel smelting: putting the ZG35Gr1Mo material into an electric arc furnace to smelt into molten steel;

[0043] (b) Casting process: resin sand molding, casting 2 pieces at the same time in one box;

[0044] Set up the pouring system, install the riser, and place the cold iron according to the above steps, and pour molten steel through the pouring system in a vertical pouring manner. At 2 / 3 of the height of the mouth, add 3kg of coal ash into each riser. After the pouring is completed, the casting is kept in the sand mold for 48 hours, and then the riser is separated by air after sand cleaning. Casting gross weight 500×2kg;

[0045] (c) Normalizing + tempering pretreatment: Put the castings prepared above into a heating fu...

Embodiment 3

[0048] A casting process for a three-stage planetary frame of an offshore platform climber, the material of the casting of the three-stage planetary frame of the offshore platform climber is ZG35Gr1Mo, and the processing steps include:

[0049] (a) Molten steel smelting: putting the ZG35Gr1Mo material into an electric arc furnace to smelt into molten steel;

[0050] (b) Casting process: resin sand molding, casting 2 pieces at the same time in one box;

[0051] Set up the pouring system, install the riser, and place the cold iron according to the above steps, and pour molten steel through the pouring system in a vertical pouring manner. At 1 / 2 of the height of the mouth, add 3kg of coal ash into each riser. After the pouring is completed, the casting is kept in the sand mold for 48 hours, and then the riser is separated by air after sand cleaning. Casting gross weight 500×2kg;

[0052] (c) Normalizing + tempering pretreatment: Put the castings prepared above into a heating fu...

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Abstract

The invention discloses a casting technology for a three-stage planetary frame of an ocean platform climbing machine. A three-stage planetary frame casting of the ocean platform climbing machine is obtained by performing an integrated casting forming technology and thermal treatment on a ZG35Gr1Mo material. The casting technology comprises the following processing steps: (a) molten liquid smelting; (b) casting process: forming two deadheads and four attaches, placing chill blocks, wherein the attaches are connected with the roots of the deadheads and are arranged at the top ends of vertical columns of the casting; the chill blocks comprise four #2 molded chill blocks, two #1 molded chill blocks and two #3 outer chill blocks which are respectively arranged at the thickest parts at the lower parts of the vertical columns and the thickest parts on the end faces of the bottoms; (c) normalization and tempering pretreatment; (d) tempering thermal treatment. Due to the mode, by reasonable arrangement of the deadheads, the attaches and the chill blocks, the internal quality, the size precision and the mechanical performance of the casting can be improved; meanwhile, the use amount of molten steel can be reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of metal casting, in particular to a casting process for a three-stage planet carrier of an offshore platform climbing machine. Background technique [0002] Due to the advantages of light weight, strong load capacity and high efficiency, planetary gear transmission is widely used in various industrial fields. As one of the key parts in planetary gear transmission, the planetary carrier has a great influence on the contact stress distribution generated by gear meshing due to its deformation, so the planetary carrier should have sufficient static strength and certain rigidity. From the analysis of technical requirements, materials, and structural characteristics, the production of planetary frames mainly has the following difficulties: castings are high-strength structural steel, and the smelting process and operation are very difficult; fatal defects such as cracks, pores, and sand holes are prone to occur d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/08C21D9/00
Inventor 陈学忠张明均
Owner CHANGSHU HONGQIAO CAST STEEL CO LTD
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