Integral cast aluminum cradle type five-axis swinging frame and manufacturing method thereof

Abstract

Provided is an integral cast aluminum cradle type five-axis swinging frame. The integral cast aluminum cradle type five-axis swinging frame is characterized in that the swinging frame is made of cast aluminum alloy 7075; as for the mechanical properties, sigma b is 530 Mpa, sigma 0.2 is 460 Mpa, and sigma 5 is 8%; axial holes d of two shafts A are coaxial with the planeness being within 0.01 mm; and the planeness of the mounting plane a of a C-axis motor and the planeness of the mounting plane b of an A-axis motor are 0.005 mm. The integral cast aluminum cradle type five-axis swinging frame is formed through integral casting and machining. A manufacturing method comprises the steps that the alloy is smelted and poured, and the swinging frame is subjected to casting, thermal treatment and integral machining. As for applied clamps, the integral cast aluminum cradle type five-axis swinging frame is characterized in that lengthening jack catches are manufactured and combined to claws of a four-claw square chuck through flat keys and screws, so that the lengthening jack catches are lengthened to be equal to the internal diameter of a horizontal axle hole of the swinging frame, and the jacking end faces of the lengthening jack catches are trimmed according to the diameter of a machined axial hole. A cast iron swinging frame is 205 Kg heavy while the cast aluminum swinging frame is only 75 Kg heavy, that is, the overall weight is reduced by 130 Kg. The A-axis acceleration of a cast iron swinging table is 7 rad / s<2> while the acceleration of the cast aluminum swinging frame applied to an intelligent multi-axis vertical machining center is 18 rad / s<2>. The speed gain of the cast aluminum swinging frame can also be doubled. The acceleration and response speed of a machine tool are remarkably improved.

Description

technical field [0001] The invention relates to metal material processing, a cast aluminum manufacturing method of integral casting and processing of a swing frame of machine tool structural parts, a cradle-type five-axis swing frame of integral cast aluminum and a manufacturing method thereof. Background technique [0002] Most of the existing machine tool structures are made of gray cast iron, which has high strength and good wear resistance, but has a large tendency of whitening and poor casting performance, and artificial aging treatment is required. It is used for important castings in machinery manufacturing, such as bed guide rails, lathes, punches and bed with large force, spindle box gears, etc.; it can also be used as high-pressure oil cylinders, pump bodies, valve bodies, etc., as well as upsetting dies, cold stamping dies and Parts that require surface hardening. At the same time, the density of gray cast iron HT300 is 7300kg / m3. Compared with cast aluminum (707...

AI Technical Summary

Problems solved by technology

[0003] The difficulty of casting ornaments lies in: the material of the swing frame is cast aluminum instead of cast iron, and the material of the ornaments is aluminum 7075 alloy, which is a high-strength alloy for aviation use, with a higher magnesium content of 2.1-2.9%, complex composition and complex smelting process

The alloy has a wide solidification temperature range of 477-635°C, and solidifies in a mushy state during the solidification process. The casting is not easy to feed and shrink, and it is not easy to obtain dense castings

The structural characteristics of castings are wall thickness, more than 100mm, and large outline size, that is, the swing frame is a thick and large structural part. With such a structure, it is not easy to obtain dense castings

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