SU1009645A1 - Method of milling large-size parts in nc machine tool - Google Patents

Abstract

METHOD OF MILLING OF LARGE-SIZE DETAILS ON CNC MACHINES, including milling of the reference plane, processing of an engraving and cutting the part along the contour, different from that | that, in order to improve the quality of processing, after the base plane is milled from the latter side, the groove is milled along the contour corresponding to it. the contour of the finished part, after which the part is installed; to the reference plane for machining the engraving and cutting the part along the contour.

Description

SO O) O

The invention relates to the field of metal cutting and can be used in the processing of large parts, such as panels, on CNC machines using to attach a universal vacuum table.

Methods are known for milling large-sized parts on CNC machines, including milling the base plane, engraving processing and cutting the part along the contour tl.

The disadvantages of these methods are the presence of manual work on processing the contour of the part after removal from the machine (cutting with a special tool and manual cleaning with the help of a mechanized tool from burrs and nicks) and the poor quality of its processing due to the presence of an underestimation of the contour.

The purpose of the invention is to improve the quality of processing.

To this end, using the described method, which includes milling the base plane, engraving processing, and cutting the part along the contour, after milling the base plane from the latter, the groove is milled along the contour corresponding to the contour of the finished part, after which the part is inverted to process the engraving and cutting out the details along the contour.

FIG. 1 shows a blank with a groove along the contour of the part; in fig. 2 is a section A-A in FIG. one ; in fig. 3 billet on the operation of cutting the part along the contour.

According to the described method, the milling of the contour of the part 1 axis ets in two steps on a machine with software control from two sides.

After mounting and fastening the parts on the vacuum table 2 of the machine, they carry out finishing milling of the reference plane 3. Then, groove i is worked around the perimeter of the part on the contour corresponding to the contour of the finished part. Base holes are machined 5.

The depth and width of the groove are determined by the design-technological characteristic of the particular part and are decisive in the choice of speed, cutting and working tool feed.

The depth of the groove must satisfy the condition

hTrt + Hz + G2 + 1,

where t is the minimum distance between the end of the cutter and the plane of the vacuum table, which guarantees the vacuum table from damage;

 cutting radius

edges on the face of the cutter, respectively, in each method of milling the contour;

E - the amount of overlap between the work moves.

After the slot is formed around the perimeter of the part, the part is reinstalled (180 ° turn) with the fixing on the basic holes 5 and fastening it on the universal vacuum table. In this case, the channels of those cells of the vacuum table that fall into the zone of the part contour (machined groove} are covered with rubber plugs. The preparation of the vacuum table is carried out before milling each fixed part behind the machine and is performed once for the whole batch of parts launching. Then The milling of the part engraving and the second method of milling the part along the contour are made. After the second part milling along the contour, the part is completely separated from the technological allowance 6.,

Thus, the proposed method of milling large-sized parts on CNC machines provides complete automation of cutting parts along the contour, eliminates the manual work of cutting and stripping the contour of the part and significantly improves the quality of processing the contour of the part.

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Claims (1)

METHOD FOR MILLING LARGE DIMENSIONS ON CNC MACHINES, including milling the base plane, engraving and cutting the part along the contour, characterized in that, in order to improve the quality of processing, after milling the base plane from the side, the groove is milled along the contour corresponding to the contour of the finished machined parts, after which the part is set <to the base plane for engraving and cutting the part along the Contour. 1009645. 2