A Drilling Method for Composite Metal Inclined Hole
A technology of composite materials and composite material layers, which is applied in the field of high-precision and low-cost drilling of multi-material composite oblique holes, can solve the problems of tapping and eccentricity, avoid verticality difference, and improve uneven force Effect
Active Publication Date: 2018-12-21
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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Problems solved by technology
[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a high-precision and low-cost method for drilling inclined holes in metal composite materials, so as to solve the problem of "cutting the knife" existing in the drilling of inclined holes in metal composite materials. " and tapping eccentricity and other issues
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[0051] The drilling steps are as follows:
[0052] (1) Positioning and clamping:
[0053]Place the universal turntable on the machine tool workbench and align it, clamp the universal turntable, install the workpiece on the universal turntable, and position and clamp, such as figure 2 shown. After clamping, turn the universal turntable until the axis of the inclined hole to be drilled is perpendicular to the machine table, such as image 3 shown;
[0054] (2) Spiral milling an oblique hole with a diameter of B on the workpiece, where B is φ12.3;
[0055] Specifically: use a φ8 end mill to mill an inclined hole with a diameter of φ12.3, milling to the composite material layer, the spindle speed is 1500rev / min, the feed rate is 60mm / min, and the milling depth is 15mm (one side of the long side of the hole The depth from the highest point to the bottom of the hole), such as Figure 4 shown.
[0056] (3) On the basis of the φ12.3 inclined hole, coaxial with the φ12.3 incline...
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A metal inclined hole drilling method of composite materials comprises the following eight steps: 1, positioning and tightly clamping; 2, performing helical milling to obtain an inclined hole with the diameter being 12.3; 3, drilling to obtain a through hole with the diameter being 9.3; 4, drilling to obtain an M16 thread bottom hole; 5, boring to obtain a counterbore hole with the diameter being 17.4; 6, tapping by using a machine tool to obtain an M16*2 thread; 7, manually tapping to obtain an M16*2 thread; 8, disassembling the tooling after completion of machining. Aiming at the common typical characteristic of aerospace products, namely the connecting inclined hole, the method solves the problems that cutter relieving is easy to occur in the metal inclined hole machining of composite materials, the machining precision is low and the drilling jig dependence is high, provides an effective solution for the inclined hole drilling of a special shaped housing on which the drilling jig cannot be mounted, and further has a practical reference value in the field of metal inclined hole machining of composite materials.
Description
technical field [0001] The invention belongs to the technical field of cutting metal composite materials, and more specifically relates to a high-precision and low-cost drilling method for multi-material composite oblique holes. Background technique [0002] Aerospace products mostly adopt a double-layer structure of composite metal. The outer layer of heat-resistant composite material has high hardness and cannot be immersed in water. The inner layer of metal material has a lower hardness, which is easy to generate chips and scratch the composite material. All sections are connected by inclined holes, and when the inclined holes are drilled, because the axis is not perpendicular to the drilling plane, when drilling materials with high hardness (such as the outer layer of heat-resistant composite materials for aerospace products), it is very easy to cause the drill bit to fail when drilling. Deviated from the axis, causing the verticality of the hole to be out of tolerance, ...
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 凌丽张翀耿琼闫卫东叶正茂刘继菲裴天河
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH