A multi-dimensional angle, double-layer composite injection hole drilling jig for the needle valve body of the fuel injector

Abstract

The invention relates to the technical field of drilling auxiliary equipment, in particular to a multidimensional-angle and dual-layer composite spray hole drilling clamp of a needle valve body of anoil nozzle. The clamp comprises a bottom plate and a locating core shaft. A locating disc, an indexing ratchet wheel, a locating bush and a workpiece are sequentially connected to the locating core shaft. The bottom plate is fixedly connected with a front-layer spray hole locating block, a rear-layer spray hole locating block and a stand column. The front-layer spray hole locating block is in contact with the locating disc. The indexing ratchet wheel and the locating core shaft are fixed through a sliding block. The locating disc and the indexing ratchet wheel are fixed through a pin. The indexing ratchet wheel is provided with a clamp groove. The clamp groove of the indexing ratchet wheel and a paw clamp groove are combined together. According to the clamp, the problems that due to clamping in branch operation and of multiple times, product consistency is poor, and production efficiency is low are solved; and precise machining of 10 spray holes distributed in a multidimensional-angleand dual-layer manner is completed through one-time clamping to the needle valve body.

Description

technical field [0001] The invention relates to the technical field of drilling processing auxiliary equipment, in particular to a multi-dimensional angle and double-layer composite injection hole drilling fixture for a needle valve body of an oil injection nozzle. Background technique [0002] The fuel injection nozzle assembly is a paired part of the needle valve body and the needle valve. It is one of the key and precision assembly parts of the fuel injection system of the diesel engine. Its performance index directly affects the fuel consumption rate, emission index and reliability of the diesel engine. The geometric dimension of the nozzle hole of the needle valve body of the nozzle pair and the technical index of shape and position tolerance are the key elements of product design. The diameter tolerance of the nozzle hole is 0.005mm, and the tolerance of the nozzle angle is ±1°. Quality, spray oil beam shape and other key points. With the improvement of human awarenes...

AI Technical Summary

Problems solved by technology

[0003] In the process of product research and development and production, EDM or micro-hole high-speed drilling is mostly used for nozzle hole processing. EDM technology can guarantee the geometric shape and technical index requirements of the product, but most of the equipment is imported from abroad. Expensive, high manufacturing cost, low production efficiency

Most of the fuel injection system industry adopts high-speed drilling technology. In order to meet product structure and production requirements, sub-processes and multiple sets of fixtures are generally used to process nozzle holes with different angles and different apertures, resulting in long production cycle, fixture adjustment time, and long process flow. Low efficiency and high manufacturing cost

[0004] During the development and development of the new multi-dimensional angle, double-layer injection nozzle assembly for the ND5 diesel engine, the high-speed drilling process was adopted, and the injection holes of different angles and apertures were processed in different procedures and with multiple sets of fixtures. Multiple clamping of workpieces and sub-process processing will greatly affect product performance, consistency of technical indicators, and quality stability. The product qualification rate is low. Large differences in technical indicators, unstable performance of the whole machine, and long production cycle, fixture adjustment time, long process flow, low production efficiency and high manufacturing cost

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