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Integrated type cast steel piston and manufacturing method thereof

A manufacturing method and integrated technology, applied in the direction of pistons, manufacturing tools, furnace types, etc., can solve the problems of many manufacturing processes, expensive equipment, low production efficiency and pass rate, etc., to simplify the production process, reduce production costs, improve The effect of production efficiency

Active Publication Date: 2013-03-20
湖南江滨机器(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing process of the piston adopts forging, stamping, special mechanical processing of the annular cavity, and special equipment for the installation of the ring cover. The manufacturing process is complicated, the manufacturing process is many, the energy consumption is high, and the cost is too high
[0004] Another existing method for manufacturing integral pistons is to forge the piston body and piston ring body blanks separately, and form a welded forged steel integral piston with a closed internal cooling oil chamber through laser welding. The complete set of laser welding equipment is expensive, and the butt welding At present, the non-destructive inspection of seam can only be carried out by industrial CT, and the industrial CT equipment is also very expensive. The piston manufacturing process of this structure is complicated, the cost is too high, the production efficiency and pass rate are low, and it is not suitable for large-scale production.

Method used

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  • Integrated type cast steel piston and manufacturing method thereof
  • Integrated type cast steel piston and manufacturing method thereof
  • Integrated type cast steel piston and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The present invention also provides a casting method of an integral cast steel piston, the method comprising the following steps:

[0036] the s 1 , Casting piston blanks, casting ring-shaped weight-reducing cavity, surface-window-type weight-reducing area, pin hole, closed cooling cavity, cooling oil outlet and cooling oil inlet;

[0037] the s 2 1. Carry out heat treatment to described piston blank, the process of its heat treatment comprises the following steps:

[0038] the s 21 , Annealing, heating temperature 860°C ± 10°C, heat preservation for 2 hours to 3 hours, cooling in the furnace to 200°C and then air cooling;

[0039] the s 22 , Quenching: Heating temperature 850°C±10°C, keep warm for 2 hours to 3 hours and then oil cool;

[0040] the s 23 , Tempering: heating temperature 580°C±20°C, heat preservation for 3 hours to 4 hours and then water cooling;

[0041] the s 24 , Stress relief aging: heating temperature 250 ℃ ± 10 ℃, heat preservation for 3 hou...

Embodiment 2

[0045] A method for casting an integral cast steel piston, the method comprising the following steps:

[0046] the s 1 , Casting piston blanks, casting ring-shaped weight-reducing cavity, surface-window-type weight-reducing area, pin hole, closed cooling cavity, cooling oil outlet and cooling oil inlet;

[0047] the s 2 1. Carry out heat treatment to described piston blank, the process of its heat treatment comprises the following steps:

[0048] the s 21 , Annealing, heating temperature 865 ° C, heat preservation for 2 hours and 30 minutes, cooling to 200 ° C in the furnace and then air cooling;

[0049] the s 22 , Quenching: heating temperature 855 ℃, heat preservation for 2 hours and 30 minutes and then oil cooling;

[0050] the s 23 , Tempering: heating temperature 590 ℃, heat preservation for 3 hours and 30 minutes and then water cooling;

[0051] the s 24 , Stress relief aging: heating temperature 255 ℃, heat preservation for 3 hours and 30 minutes and then air c...

Embodiment 3

[0055] A method for casting an integral cast steel piston, the steps comprising:

[0056] the s 1 , Casting piston blanks, casting window-type weight-reducing areas, pin holes, closed cooling chambers, cooling oil outlets and cooling oil inlets;

[0057] the s 2 1. Carry out heat treatment to described piston blank, the process of its heat treatment comprises the following steps:

[0058] the s 21 , Annealing, heating temperature 860°C ± 10°C, heat preservation for 2 hours to 3 hours, cooling in the furnace to 200°C and then air cooling;

[0059] the s 22 , Quenching: Heating temperature 850°C±10°C, keep warm for 2 hours to 3 hours and then oil cool;

[0060] the s 23 , Tempering: heating temperature 580°C±20°C, heat preservation for 3 hours to 4 hours and then water cooling;

[0061] the s 24 , Stress relief aging: heating temperature 250 ℃ ± 10 ℃, heat preservation for 3 hours to 4 hours and then air cooling.

[0062] the s 3 1. Machining a combustion chamber pit, ...

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Abstract

The invention discloses an integrated type cast steel piston, wherein a side window type weight losing area is arranged in a piston skirt part; the weight of the integrated type cast steel piston is decreased by more than 15% to 20%; in such a way, the weight of the integrated type cast steel piston is enabled to approach the weight of an aluminum alloy piston of the same type; and therefore, the requirement on the light weight of an engine is met. The invention also discloses a manufacturing method of the integrated type cast steel piston, wherein the method mainly comprises the following steps: casting a piston blank, and casting out the side window type weight losing area, a pin hole, a sealed cooling cavity, a cooling oil outlet and a cooling oil inlet; performing heat treatment on the piston blank; processing out a combustion chamber concave pit, a piston head, the piston skirt part and an annular groove area in the piston blank which undergoes the heat treatment; and performing overall phosphating on the piston. With the adoption of the method provided by the invention, the production technology of the integrated type cast steel piston is simplified, the production efficiency is improved, and the production cost is simultaneously lowered.

Description

technical field [0001] The invention belongs to the field of piston manufacturing, in particular to an integral cast steel piston and a manufacturing method thereof. Background technique [0002] Piston is the key part of the engine, it has been working under the conditions of high temperature, high load and poor lubrication for a long time, and bears the periodic mechanical load and thermal load. The focus of research on diesel engine design. Whether the piston design is reasonable or not directly affects the power, economy, reliability and service life of the engine. [0003] At present, the existing method for manufacturing integral pistons is to forge the piston blank as a whole, machine the annular cavity, and use two punched ring covers to seal the annular cavity to form a closed internal cooling oil cavity. The manufacturing process of the piston adopts forging, stamping, special mechanical processing of the annular cavity, and special equipment for the installation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/00F02F3/16C21D9/00
Inventor 张轶刘德怀代凌峰
Owner 湖南江滨机器(集团)有限责任公司
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