Surface hardening treatment method for large-power low-speed diesel engine piston bar

A hardening treatment and piston rod technology, which is applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of uneven heating in induction hardening, large deformation in flame quenching, and high energy consumption.

Active Publication Date: 2008-03-26
DALIAN MARINE DIESEL
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of flame quenching with relatively large deformation, large energy consumption, or uneven local heating of induction

Method used

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  • Surface hardening treatment method for large-power low-speed diesel engine piston bar

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Experimental program
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Effect test

Embodiment 1

[0006] Embodiment 1, a surface hardening treatment method and inductor of a high-power low-speed diesel engine piston rod of the present invention are specifically realized through the following technical solutions:

[0007] 1. Production of the sensor:

[0008] The sensor adopts Φ30 red copper rod, which is composed of two semicircular parts on the left and right. The inside is a hollow channel connected with the water inlet pipe 1 and the water outlet pipe 11. A decompression distribution baffle 5 is installed on the two water inlet pipes of the sensor to spray water. The position of the hole 6 is set at the lower edge of the inner side of the sensor and drilled at a position 45° inward to form a continuous distribution of water spray holes. The diameter of the water spray holes is Φ1.5mm and the spacing is 4mm. Simultaneously, the front parts of the two half inductors are drilled at 45° incline to the joint site near the water spray hole 8 at the joint site to ensure that t...

Embodiment 2

[0014] A surface hardening treatment method for a piston rod of a high-power low-speed diesel engine of the present invention, taking the external diameter of a low-speed marine diesel engine 50MC as an example of a piston rod of 200 mm, (1) continuous heating: the piston rod is vertically arranged on a rotatable chassis of the base , the upper center positioning hole is set under the top cone of the frame; the sensor is installed around the lower end of the piston rod. up to 920°C; (2) Cooling: use circulating water as the cooling medium, when the heating temperature of the piston rod reaches 920°C, the cooling water in the sensor is continuously sprayed to the surface of the heated piston rod through the water spray hole for cooling and quenching (3) Tempering: put the piston rod into the tempering furnace for tempering heating, the tempering temperature is 240°C for 4 hours, and then air-cooled. Whether it is the hardness of the surface, the depth of the hardened layer, or ...

Embodiment 3

[0016] A kind of surface hardening treatment method of piston rod of high-power low-speed diesel engine of the present invention, take the piston rod of 70MC of low-speed marine diesel engine as an example, (1) continuous heating: install inductor, inductor walking speed 140mm / min , the piston rod rotates at a speed of 50rad / min, and the temperature of the piston rod is continuously heated to 930°C; (2) Cooling: using circulating water as the cooling medium, when the heating temperature of the piston rod reaches 930°C, it is continuously sprayed for cooling; (3) Tempering: Tempering temperature is 230°C, time is 4 hours, air cooling. Whether it is the hardness of the surface, the depth of the hardened layer, or the structure, it can fully meet the requirements of the drawing and process.

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Abstract

The surface hardening treatment process for piston rod of great power low speed diesel engine includes continuous surface heating to 900-940 deg.c in an intermediate frequency inducing heater of the quenching apparatus, quenching through spraying water, tempering through heating to 200-270 deg.c, and rotating the piston rod while heating in the inducing heater and spraying water. The present invention has high quenching efficiency, environment friendship, homogeneous heating and quenching, and capacity of reaching required surface hardness, quench hardened layer depth and micro structure.

Description

[0001] Technical field: The present invention relates to a method for induction heating and quenching of the surface of a piston rod of a high-power low-speed marine diesel engine. Background technique: [0002] The piston rod is a key component of a low-speed diesel engine. During the operation of the diesel engine, its upper end moves in the cylinder, and the lower end is connected with the connecting rod. The working conditions require the surface of the piston rod to have high hardness and wear resistance. Therefore, surface hardening treatment is performed. The traditional process method is flame heating and quenching, which wastes energy and causes great deformation of the piston rod, which makes it difficult for subsequent processing. If induction heating and quenching is selected, according to the existing treatment methods and existing sensors, it cannot be directly used for large workpieces such as piston rods of high-power low-speed marine diesel engines with a diam...

Claims

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Application Information

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IPC IPC(8): C21D1/10C21D1/667C21D9/00C21D11/00
CPCY02P10/25
Inventor 宋奎元卢春玲杨德睿王金来
Owner DALIAN MARINE DIESEL
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