Porous metallic beryllium deep-hole machining method

Abstract

The invention relates to a porous metallic beryllium deep-hole machining method. The porous metallic beryllium deep-hole machining method includes: adopting an eccentric fixture to mount a workpiece on a deep-hole drilling machine; performing primary drilling on a first hole and stopping upon drilling through prior to removing the workpiece; adopting a method by using a gasket to remove positioning deviation and filling equal-weighing objects into the drilling position prior to loading the workpiece into the eccentric fixture once again for primary drilling on a second hole; after four holes are primarily drilled according to above processes, performing multistage broaching and reaming according to the above processing steps. The multiple deep holes of a four-hole square brick are subjected to machining by adopting the deep-hole drilling processes including drilling (phi 20mm), multistage broaching (phi 24mm, phi 26mm, phi 28mm, phi 30mm and phi 32mm) and reaming, so that deep-hole machining of large diameter (> / =32mm) and large length diameter (50-150) upon metallic beryllium materials can be realized, machining precision of the hole after reaming can reach the level of IT7, and surface smoothness can reach Ra 0.4.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal processing, in particular to a deep hole processing method of porous metal beryllium. Background technique [0002] The machining performance of metal beryllium is mainly determined by the mechanical properties of metal beryllium, including hardness, elastic modulus, strength and plasticity, etc. All conventional machining methods can process beryllium, such as turning, milling, grinding, planing, , Boring, drilling, reaming, sawing, tapping, etc. Other processing methods such as EDM, EDM drilling, mechanical grinding and polishing, electrochemical corrosion, etc. are also suitable for machining beryllium. However, there are two problems that are difficult to solve in the machining of beryllium: 1. Due to the brittleness of beryllium and the sensitivity to notches, when machining beryllium, when the tool leaves or enters the workpiece, edge slag will appear, and even lead to Beryllium w...

AI Technical Summary

Problems solved by technology

However, there are two problems that are difficult to solve in the machining of beryllium: 1. Due to the brittleness of beryllium and the sensitivity to notches, when machining beryllium, when the tool leaves or enters the workpiece, edge slag will appear, and even lead to Beryllium workpieces are brittle under low stress; 2. Beryllium has severe tool wear and tear, and it is difficult to ensure machining accuracy. This is because beryllium machining is brittle, and high-hardness chips generate normal stress on the front of the tool and continuously impact the cutting edge. The tool is eroded, and the fine beryllium powder (including beryllium oxide) in the powder metallurgy beryllium also has a grinding effect on the tool, and the cutting edge wears quickly, which is more significant for high-speed steel tools

[0006] 2. When processing deep holes with thin walls, due to the brittle nature of beryllium materials, it is easier to squeeze the deep holes during the cutting process

[0007] 3. When drilling with a deep hole drilling machine, use the self-centering principle of the three-jaw chuck to clamp the cylindrical workpiece so that the center of the workpiece coincides with the center of the spindle of the peripheral machine tool. When the workpiece rotates, the tool makes a straight line Feed movement, so as to process a deep hole in the center of the workpiece, while the cross-section of the 4-hole square brick is square, and the center of the 4-hole is not on the geometric center of the square brick, so it cannot be directly clamped with a three-jaw chuck

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