RU1798051C - Method of machining blanks - Google Patents

Abstract

Usage: processing of materials by cutting, the manufacture of blanks and parts from sheet metal on milling machines. SUMMARY OF THE INVENTION: A cutting plan is made in which blanks with a step are placed on the sheet in an optimal manner without leaving a cut allowance. Then blanks are milled around the perimeter, first in a checkerboard pattern on one side, then the rest on the other. When milling, blanks on each side are machined on the plane of the ledges. The thickness of the sheet, the diameter of the cutter and the width of the milling are related by a certain ratio. 5 ill.

Description

The invention relates to the processing of materials by cutting and can be used in the manufacture of billets and parts from rolled plates on CNC milling machines in machine-tool and instrument-making enterprises under conditions of single and serial production.

The aim of the invention is to increase the productivity of the process by eliminating the subsequent refinement of the workpieces with a ledge along the entire perimeter and increasing the utilization of the material due to the order of separation of the workpieces from each other.

In FIG. 1 shows a plan for cutting in the manufacture of blanks by the proposed method: in FIG. 2 - the same, after milling the plane of the ledges from the first side; in FIG. 3 - the same, from the second side; in FIG. 4 is a section A-D in FIG. 2; in FIG. 5 is a section BB in FIG. 3.

To implement the method, a cutting plan is first drawn up, where the workpieces are placed in an optimal way, but without leaving an allowance for cutting, and alternating them alternately with a step up (part a) and a step down (part b) in FIG. 1, for example, in a checkerboard pattern. Then, plate rolling — plate 1 with prepared base sides 2 and 3 (Fig. 2) —is installed and fixed on the table of the CNC machine and milled according to the program of the plane of the ledges of those workpieces that are arranged with a ledge upward. After processing all the blanks, the plate 1 is turned over and mounted on the same base sides 2 and 3, and then the plane of the ledges of the remaining blanks are milled, which after the plate is turned upside down (Fig. 3).

In FIG. 4 and 5 it is seen that for the implementation of the method it is necessary that the following conditions are met:

h H / 2, (1)

ate

t

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00

about eating

10

fifteen

, (2)

B ЈН / 2, (3)

Condition (1) is a requirement for the geometric dimensions of the workpiece to be manufactured; word (2) is a restriction on the choice of the diameter of the cutter during the implementation of the method, and mustache (3) is necessary so that the preparations, after processing the plate, are separated from each other from two torons.

A particular case of cutting from a sheet is cutting from a strip. Then, for the implementation of the method, the workpieces must have stupas at least along the mating sides on the plan. ..:.

Example. The blanks for round lids are made of a plate with a thickness of:) mm, the outer diameter of the blank D: 00 mm, the step height h 25 mm, width. ledge with "30 mm. . //.

From the condition of the highest productivity, 20, and also taking into account condition (2), the diameter of the cutter is chosen, for example, d.24.MM. A cutting plan is made, where the workpieces are arranged alternately with a step up and a step down without leaving jumpers; Then the planes of the steps are milled with a milling width of 22 mm,; ,

Using the proposed method

manufacturing of blanks provides

Compared with the known following advantages:::. . /. -

reduction of material waste due to the exclusion of jumpers for cutting;

Reduce the complexity of open, i.e. it is possible to use a more rigid cutter during cutting;.:

®

25

thirty

35

10

fifteen

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twenty

25

thirty

35

reducing the complexity of subsequent processing of the part due to the combination of cutting and preliminary processing of the step of the part;

Implementation of the method in the manufacture of blanks for a large class of parts such as hatches, covers, flanges, etc. will give a significant economic effect in the national economy.

Formula of the invention

A method of manufacturing billets, in which they plan the arrangement of billets on a sheet of rolled metal and mill them around the perimeter to separate one from the other, bending and so that, in order to increase the productivity of the process by eliminating the subsequent refinement of the billets with a step around the entire perimeter and increasing the utilization of the material due to the order of separation of the blanks from one another, the latter are milled in two stages, first in a checkerboard pattern on one side of the sheet, and then the rest on the other, while planes of ledges are machined on the blanks of each side, and the thickness of the sheet, the diameter of the cutter and the width of the milling are selected from

.CONDITIONS. . ...:

h bn / 2,:

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In N / 2 /: where h is the height of the ledge; H-sheet thickness; d-diameter of the cutter; c-width of the ledge; In milling width.

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