Multifunctional micro metering hole electric spark machining clamp

Abstract

The invention discloses a multifunctional micro metering hole electric spark machining clamp. The multifunctional micro metering hole electric spark machining clamp comprises a base, a clamping blockI and a clamping block II, wherein the center of the base is provided with a variable diameter hole, and the diameter of an upper hole is smaller than the diameter of a lower hole in the variable diameter hole; a positioning shaft I is arranged at the bottom of the clamping block I, the diameter of the positioning shaft I is matched with the diameter of the upper hole, an eccentric sliding valve mounting groove is formed in the upper part of the clamping block I, and a to-be-machined sliding valve is arranged in the sliding valve mounting groove; a positioning shaft II is arranged at the bottom of the clamping block II, the diameter of the positioning shaft II is matched with the diameter of the upper hole, an eccentric valve block mounting groove is formed in the upper part of the clamping block I, and a to-be-machined valve block is arranged in the valve block mounting groove; when the clamp is used for machining the sliding valve, the clamping block I is arranged on the base, and the sliding valve is arranged into the clamping block I; and when the valve block is machined, the clamping block II is arranged on the base, and the valve block is arranged in the clamping block II. The multifunctional micro metering hole electric spark machining clamp has the advantages that the clamp assembly is simple in structure, clamping of an operator is fast, the manufacturability is high,the machining freedom degree of a part is reasonably limited, and the size precision of the pat is guaranteed easily.

Description

Technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a multifunctional micro-metering hole electric spark machining fixture. Background technique [0002] The new generation of armored assault equipment power system represented by the four-generation tank high power density and amphibious high-speed diesel engine is the core of my country’s future army weapons and equipment. It has high power density, high global mobility, large flow, and ultra-short fuel injection duration. Typical characteristics. With the gradual improvement of my country's army equipment level, it is an inevitable demand for the new generation of armored assault equipment power system to choose high-pressure common rail fuel supply system. The important indicator that affects the performance of the injector in this system is the response time of the core key component spool valve assembly to the solenoid valve. The solenoid valve cannot directly control ...

AI Technical Summary

Problems solved by technology

There are many defects in the drilling technology of ordinary high-speed drilling machines: 1. Microholes are processed before heat treatment, and the microholes are easy to change after heat treatment, and the amount of change is not fixed; 2. Low processing accuracy and poor dimensional consistency; 3. High-speed drilling generally processes microhole diameters Between φ0.15mm~φ0.50mm, the drill bit is thin and easy to break

The second processing technology has the advantages of strong consistency of micropores, but the disadvantages are: 1. Micropores are processed before heat treatment, and the micropores are easy to change after heat treatment, and the amount of change is not fixed; 2. High-frequency ultrasonic vibration produces mechanical processing stress, which affects The accuracy of the machine tool workbench is affected by the resilience of ultrasonic vibration. The drill bit is easy to break. The price of each drill bit used in this process is 1200 yuan, and the production cost is high.

[0010] 1. Adapt to a single product: by image 3 As shown, the existing clamping structure of the machine tool is only for one part of the needle valve body, and the processed product type is single; there is no interchangeable clamping tool, which cannot meet the processing needs of other types of parts different from the needle valve body structure

[0011] 2. The stability of processing quality is poor, and the coincidence between the microhole of the part and the machining center of the electrode wire is poor: the positioning element of the machine tool fixture is a φ5.5 (+0.01 / 0) mm mandrel (hereinafter referred to as the mandrel), and the center hole of the needle valve body is the positioning reference , the size is between φ5.6mm~φ5.9mm

The gap between the mandrel and the mandrel is uncertain due to the large dispersion of the positioning dimension of the part. The positioning reference error during processing causes the center of the middle hole to deviate from the center of the guide electrode wire. The distance between the wire centers is different, and the discharge time and pulse voltage are slightly different, which makes the nozzle hole size out of tolerance, the nozzle holes are unevenly distributed, and the angle is out of tolerance

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