Electrochemical machining method and device for oil nozzle spray orifice of diesel motor

A diesel engine and processing method technology, applied in electrochemical machining equipment, metal processing equipment, manufacturing tools, etc., can solve the problem of difficulty in controlling the arc shape and arc radius, small arc transition radius in the nozzle hole, and abrasive particles. The problem of high cost of flow processing can achieve the effect of good spray effect, improve the flow coefficient of nozzle holes, and avoid the influence of processing accuracy.

Inactive Publication Date: 2013-08-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism of the EDM inverted cone nozzle hole is complicated, the hole wall roughness is high, and the electrode is worn out.
The processing cost of abrasive particle flow is high, and the arc transition radius of the inner mouth of the nozzle hole is small, and it is difficult to control the arc shape and arc radius

Method used

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  • Electrochemical machining method and device for oil nozzle spray orifice of diesel motor
  • Electrochemical machining method and device for oil nozzle spray orifice of diesel motor
  • Electrochemical machining method and device for oil nozzle spray orifice of diesel motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as image 3 As shown in a to 3f, this embodiment includes the following electrolytic machining steps:

[0031] 1) Pre-drilling or EDM a cylindrical or forward conical (that is, the diameter of the outer port is greater than the diameter of the inner port) through hole 61 on the injector workpiece 6;

[0032] 2) Fix the fuel injector workpiece 6 on the support frame 55, clamp the tool electrode 2 on the electrode feed mechanism 3, and move the fuel injector workpiece 6 so that the central axis of the through hole 61 on it is aligned with the center axis of the tool electrode 2. The central axes coincide, and the tool electrode 2 is moved so that its end face 23 is located above the outer opening 62 of the through hole 61 on the injector workpiece 6;

[0033] 3) Start the liquid pump 53 to inject the electrolyte 56 into the through hole 61, and the electrolyte 56 flows back from the liquid tank 52 to the electrolyte container 51 to form an electrolyte circulation. T...

Embodiment 2

[0038] The steps of the electrolytic machining method of the present embodiment are basically the same as the steps of the embodiment 1, and the difference between the two is only in the step 4), and the step 4) of the present embodiment is expressed as follows:

[0039] 4) Turn on the electrolytic machining power supply 1. The pulse width and pulse spacing of the electrolytic machining power supply 1 are kept constant during the machining process. The electrode feed mechanism 3 is controlled by the industrial computer 4 to drive the tool electrode 2 into the through hole 61, and from the outside of the through hole 61 The port 62 feeds at a constant speed towards the inner port 63, and the through hole 61 is processed through the electrolyte 56. At the same time, as the tool electrode 2 is gradually fed, the pulse amplitude gradually increases, and the pulse amplitude depends on the required hole shape. The size and size are determined by electrochemical forming rules and proc...

Embodiment 3

[0041] In this embodiment, the reverse conical spray hole 65 of the fuel injection nozzle workpiece 6 that has been processed into a reverse conical shape is polished, and the circular arc transition region 64 is processed, and the electrolytic machining is performed. Step is basically the same as the step of embodiment 1, and the difference between the two is only step 1), step 4) and step 5), and step 1), step 4) and step 5) of the present embodiment are represented as follows:

[0042] 1) Machining an inverted tapered nozzle hole 65 without a circular arc transition zone 64 on the injector workpiece 6 by electric spark method;

[0043] 4) Turn on the electrolytic machining power supply 1, the pulse width, pulse interval, and pulse amplitude of the electrolytic machining power supply 1 remain unchanged during the machining process, and the industrial computer 4 controls the electrode feeding mechanism 3 to drive the tool electrode 2 into the through hole 61, from The outer p...

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Abstract

The invention relates to an electrolytic machining method and device for the nozzle hole of a fuel injector of a diesel engine, which comprises the following steps: 1) pre-processing a cylindrical or forward tapered through hole on the workpiece of the fuel injector; The nozzle workpiece is set in an electrolyte circulation device, a tool electrode is clamped on an electrode feeding mechanism, the positive pole of an electrolytic machining power supply is connected to the nozzle workpiece, the negative pole is connected to the tool electrode, and the The electrolytic processing power supply, the electrode feeding mechanism and the liquid pump of the electrolyte circulation device are connected to an industrial computer through the drive circuit; 3) Start the liquid pump to inject the electrolyte into the through hole of the nozzle workpiece, and the electrolyte flows back from the liquid tank to the electrolysis 4) Turn on the electrolytic machining power supply, and the industrial computer controls the electrode feeding mechanism to drive the tool electrode to make a feeding movement, and at the same time controls the electrical signal parameters of the power supply, and performs electrolytic machining on the through hole until the through hole is completely closed. Processed into an inverted tapered nozzle hole with a circular arc transition zone; 5) Turn off the electrolytic machining power supply and liquid pump, and reset the tool electrode. The invention can be widely used in the processing of spray holes with various shapes.

Description

technical field [0001] The invention relates to a method and a device for processing a nozzle hole of a fuel injector of a diesel engine, in particular to a method and a device for electrolytic processing of a nozzle hole of a fuel injector of a diesel engine. Background technique [0002] Energy crisis and environmental pollution are major issues facing the world today. As an important power source currently used by humans, engines consume a lot of fuel and emit a lot of harmful gases. Therefore, it is of great significance to improve the fuel utilization rate of diesel engines and reduce harmful gas emissions. The spray effect of the fuel injection system of a diesel engine directly affects the fuel utilization rate and the emission of harmful gases. The fuel injector is the core component of the fuel injection system, and the structure and shape of its nozzle hole have a very important impact on the atomization of fuel. A large number of theoretical and experimental stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H9/10B23H3/00
Inventor 李勇胡瑞钦
Owner TSINGHUA UNIV
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