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Machining method of diesel engine valve blank

A processing method, diesel engine technology, applied in the field of valve processing, can solve the problems of failure to meet the design requirements, low valve fatigue strength, increased raw material consumption, etc., to achieve the effect of improving the strengthening effect, shortening the production cycle, and reducing the manufacturing cost

Active Publication Date: 2020-02-21
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the traditional processing method are: due to the need for rough turning of the forging blank, the consumption of raw materials is increased, the processing procedures are many, the forging blank is subjected to solution treatment after annealing, and the energy consumption is high
In addition, mechanical rolling is used for strengthening treatment, and the depth of the strengthening layer of the cone surface of the valve disc does not exceed 3.2mm, which does not meet the design requirements
In summary, the traditional processing method consumes more raw materials and costs more, has many processing steps, long production cycle, low fatigue strength of the valve, poor reliability and short service life

Method used

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  • Machining method of diesel engine valve blank
  • Machining method of diesel engine valve blank
  • Machining method of diesel engine valve blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one, a kind of processing method of diesel engine valve blank, it comprises the following steps:

[0026] S1, hot heading forming, see figure 1 Firstly, the Nimonic80A bar with a diameter of 21mm is upset into the valve rough blank 5 on the electric heating upsetting machine, and then the valve rough blank 5 is put into the hot forging die and forged into a forging blank, so that the valve disc is formed.

[0027] S2, heat treatment, because Nimonic80A is an austenitic material, during the air cooling and annealing process after upsetting, the forging blank has no structural transformation, no large structural stress, and small thermal stress, so the post-forging annealing process of the blank is omitted Solid solution is directly carried out, and the waste heat after forging is used to directly carry out solid solution treatment, which reduces energy consumption and production cost. That is, after the hot forging is finished, the forging blank with a temper...

Embodiment 2

[0033] Embodiment two, a kind of processing method of diesel engine valve blank, it comprises the following steps:

[0034] S1, hot upsetting forming. Firstly, the Nimonic80A bar with a diameter of 35mm is upset on the electric heating upsetting machine to form a valve blank, and then the valve blank is put into a hot forging die for forging to form a forging blank, so that the valve disc is formed.

[0035] S2, heat treatment, after the hot forging, put the forging blank with a temperature of 1027°C into a high-temperature furnace for solution treatment, keep it at a temperature of 1060°C for 2 hours, and cool it to room temperature with water. Then put it into a medium-temperature furnace for aging treatment, keep it warm for 12 hours at a temperature of 780°C, and then come out of the furnace.

[0036] S3, deformation strengthening, aging treatment, put the forging blank into the deformation strengthening mold within 5s after being released from the furnace, and then use 16...

Embodiment 3

[0038] Embodiment three, a kind of processing method of diesel engine valve blank, it comprises the following steps:

[0039]S1, hot upsetting forming. Firstly, the Nimonic80A bar with a diameter of 29mm is upset on the electric heating upsetting machine to form a valve blank, and then the valve blank is put into a hot forging die for forging to form a forging blank, so that the valve disc is formed.

[0040] S2, heat treatment, put the forging blank with a temperature of 1037°C into a high-temperature furnace for solution treatment, keep it at a temperature of 1040°C for 3.5 hours, and cool it to room temperature with water. Then put it into a medium-temperature furnace for aging treatment, keep it warm for 11.5 hours at a temperature of 750°C, and then come out of the furnace.

[0041] S3, deformation strengthening, aging treatment, put the forging blank into the deformation strengthening mold within 4s after being released from the furnace, and then forge it once with a pre...

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Abstract

The invention discloses a manufacturing method of a diesel engine valve blank. The manufacturing method comprises the following steps of S1, hot upsetting forming, specifically, conducting upsetting on a bar on an electric upset forging machine to form a rough blank and conducting forging and pressing in a die to form a forging blank; S2, heat treatment, specifically, feeding the forging blank into a high-temperature furnace to be subjected to solution treatment immediately after completion of forging and pressing, conducting water cooling to the indoor temperature, conducting heat preservation and aging treatment at 750-780 DEG C for 10-12 h and then discharging the forging blank from the furnace; and S3, deformation strengthening, specifically, feeding the forging blank into a deformation strengthening die within 3-5 s after aging treatment and furnace discharge, conducting forging and pressing at pressure of 6500-17000 KN for 1-3 times, conducting oil cooling on the forging blank tothe indoor temperature to obtain the diesel engine valve blank. Through the manufacturing method, the requirement for the performance of the valve blank can be met, the service life of the valve blank can be prolonged, the production procedures can be reduced, the consumption and production cost of a raw material can be reduced, and the production cycle can be shortened.

Description

technical field [0001] The invention relates to valve processing, in particular to a processing method for a diesel engine valve blank. Background technique [0002] The valve is one of the key moving parts of the heart of the diesel engine, and it is also its basic and vulnerable parts. As the "heart" moving part, it is the key moving part that determines the performance and reliability of the diesel engine. As a basic part, it plays a very important role in the maintenance cycle and service life of the diesel engine. If the valve fails during the service life, it will directly cause serious consequences such as deformation or even damage of the cylinder, piston, supercharger and other components on the diesel engine, which will cause huge economic losses to the user. [0003] Since the valve is a consumable part and is located in the "heart", the diesel engine needs to be disassembled to replace it, which is labor-intensive and time-consuming. If the valve breaks down d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 明国建刘承建张贵虎何晓飞
Owner CHONGQING YUEJIN MACHINERY
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