Numerical control processing method for aluminum alloy high-precision flat bottom hanging hole

Abstract

The invention discloses a numerical control processing method for an aluminum alloy high-precision flat bottom hanging hole. The numerical control processing method comprises the following steps thatS1 part clamping is carried out; S2 initial hole processing is carried out, wherein S21 the diameter of a processed initial hole is determined to be phiF, the diameter of a final hole is phi, and thediameter of the final hole and the diameter of the initial hole meet the condition that the difference between phi and phiF is larger than or equal to 1 mm, and the initial hole is coaxial with the final hole, S22 a hole milling tool is selected as an initial hole processing tool, a hole milling manner is adopted for initial hole processing, the hole milling tool bottom tooth radius R is consistent with the hole bottom angle diameter phiR, and the length to diameter ratio of the hole milling tool is smaller than 4:1, and S23 machining is carried out and specifically refers to the condition that spiral tool feeding sequence milling processing is adopted, the spiral tool feeding trajectory diameter is larger than D / 4, part axial layering processing is carried out, the axial machining depth meets the condition that LG is equal to LH, in the formula, the D is the hole milling tool diameter, the LG is the axial machining depth of the initial hole, and the LH is the depth of the final hole;step S3 boring processing is carried out; and step S4 root bottom angle processing is carried out, and processing is carried out. The numerical control processing method can effectively improve the processing quality and efficiency of the flat bottom hanging hole.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a numerical control processing method for high-precision flat-bottomed hanging holes of aluminum alloys. Background technique [0002] With the development of aviation technology, the requirements for the new generation of aviation equipment are getting higher and higher. The flat-bottomed hanging holes are arranged on the shell of the launcher, which affects the suspension accuracy of the missile launcher. The flat-bottomed hanging hole is composed of a cylindrical groove, which is located on the outline of the part. It is a blind hole. The bottom surface of the cylindrical groove is a plane, and the cylindrical surface and the bottom plane are smoothly transitioned by the bottom angle R. The standard tolerance grade is between IT6 and IT11. It is usually required that the hanging hole has high processing accuracy, and it is necessary to ensure that the shape and ...

AI Technical Summary

Problems solved by technology

[0003] Generally, the precision holes above H9 are processed by drilling and reaming, but the precision and diameter of the holes processed by this type of hole making method are determined by the precision and diameter of the reamer. The maximum diameter of the general reamer is only 18mm. The highest is H7, which cannot fully meet the accuracy requirements of flat-bottomed hanging holes, and because both the reamer and the reamer must consider the guiding problem, it is impossible to make blind holes such as flat-bottomed holes

[0004] The cylindrical countersink can be used to process flat-bottomed holes. The principle of countersinking is basically the same as that of drilling. The main problem is that the vibration caused by the large cutting force of the tool makes the surface quality of the countersinking machine poor and cannot meet the requirements of precision holes.

[0005] There is no clear processing method for this type of high-precision flat-bottomed hole. It relies too much on engineering experience and on-site operation, and lacks a scientific and standardized method, which leads to poor processing accuracy and low efficiency.

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