Rough finish milling and milling tools for titanium alloy cavity.
A milling tool for concave cavity rough and finish milling. The concave surface of the tooling fixed on the workbench in the previous process is machined to match with the convex cavity of the cover part, and the two sides of the tooling are matched with the mounting step surfaces at both ends of the cover part to achieve accurate positioning. Tooling concave surface and plane, plane and plane intersection place root cleaning to avoid burr or sharp edge affect positioning accuracy. Using 10 M10 threaded holes on both sides of the tooling to complete the clamping and fixing of the cover parts and tooling.

The cutting tool, cutting fluid and cutting parameters of concave cavity are basically the same as those of convex cavity. The four M16 clamping holes in the previous process are easy to cause vibration damage to the tool in the process of milling, which should be paid attention to in cutting. Cutter and milling parameters and convex cavity finishing are the same.

What should be noted in the work is:

(1) A natural failure treatment must be arranged between the rough and finish machining of the concave cavity of the cover plate parts to completely release the internal stress generated by the cutting and prevent the deformation of the machining;

(2) When finishing clamping, the mating surface of the cover plate parts and the tooling should be replaced several times before and after, and the black grinding marks on all mating surfaces in the tooling should be repeatedly repaired to ensure that the mating surface of the cover plate parts and the tooling can not have obvious gaps after positioning;

(3) Clear the chips at the root and Angle of the tooling and on the matching surface to avoid damaging the cover parts and affecting the surface quality; (4) When locking screws on both sides, they should be rotated alternately and symmetrically to avoid deformation caused by clamping force as far as possible.

Finish the mounting surface

After detection and processing of the installation surface, the main reason for the flatness and surface roughness is the tool mark or machining deformation and other factors, which need to re-finish the installation surface.

Positioning datum and clamping fixed surface should be choose on both sides of the cover plate parts parallel installation step surface, first choose the finishing milling processing method, then choose the finishing grinding processing method, and finally choose the grinding processing means, and in the process of continuous detection. Reserve a machining allowance within 0.5mm in the machining process of the convex cavity to meet the accuracy requirements. After the completion of processing through the inspection of qualified cover parts.

Titanium alloy TC4 is a difficult material to process, the cover parts belong to the structure of thin wall and cavity, the actual CNC machining using the same tooling, in the design can be consistent with the overall process of the cover parts; In terms of technology, it not only solves the clamping positioning, but also can skillfully overcome the vibration of 2mm thin wall machining, avoid clamping force is too large, prevent deformation and other problems. In processing practice, rational use of tooling can reduce cost, convenient operation, save time and high efficiency.