SU1607992A1 - Method of producing roll-formed billets - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to the technology of making stiffeners. The purpose of the invention is to reduce the consumption of materials and labor intensity of manufacture. Two blanks with curved end sections are cut out of the sheet or profile. The radii of curvature for the inner and outer contour of the end sections are chosen to be the same. The length of the end sections is chosen in the range of 0.6-2.5 heights of the bent blanks. After cutting, the workpieces are bent in the middle part, as a result of which all the workpieces without lengths of ends after bending into waste are obtained with a given curvature shape. When cutting in this way, one is needed once to separate one piece, for example, from a sheet, which completely eliminates the consumption of metal for trimming, for allowance. 5 il.

Description

The invention relates to the processing of metals by pressure, in particular, to the technology of making stiffeners.

The purpose of the invention is to reduce the consumption of materials and labor intensity of manufacture.

FIG. 1 shows the cutting of the sheet under the bent workpiece; in fig. 2 - the same for the I-beam profile; in fig. 3 - the same, when the workpiece is cut immediately curvilinear; in fig. 4 - the same, when the blank is cut off at the ends by a curvilinear one, and in the middle part - by a straight line; in fig. 5 is the same when the end sections are cut with the same radius of rounding of the inner and outer contours.

When cutting, for example, from a sheet immediately of a billet of a curvilinear form (Fig. 3), the utilization rate of the metal is small, the amount of allowance for underbore is high, i.e., waste (/ ohh) is large. Items 1-3 show the cut blanks.

When cutting lotovki with curvilinear end sections on the length / g and straight linear part (Fig. 4), which

then it is bent to the radius R "" - the radius of the inner curvature, it is obtained by curvilinear a workpiece with k - the outer radius of curvature. However, when cutting blanks with gas, two cuts go along the entire length of the part parallel to each other in the ras-. standing from each other, equal to LL. Two cuts in the separation of one piece in two times reduce productivity.

When cutting, for example, two blanks

1 and 2 (fig. I, 2, and 5) for stiffeners with height (I) from a sheet (fig. 1 and 5) or from a profile (fig. 2), the ends of the workpieces at length / podg, which are usually not bent, are immediately curvilinear. with the same radius of curvature of the inner () and outer contours (R "), i.e.

.. Prts such cutting to separate one workpiece need one cut. At a specified radius, the strips are joined in construction, for example, to the vessel plating.

After cutting the cut strips I and

2 (FIGS. I and 2), the middle part of the workpiece is bended, whilst everything is completely finished, usually including foot bent pieces (L

O5 O

with

WITH

Yu

They are given a given shape of a crissine without lengths of ends after bending to waste. The quantity / iad is chosen in the range of 0.6-2.5 / i where A is the height of the bent workpiece.

Example. In the six columns, the semi-submersible floating drilling rig has 334 ring ribs of 15X200 mm diameter of 4500 mm. Each stiffener consists of six branches, and at each end of the branch there is a technological allowance of 400 mm due to the inability to bend the ends ...

According to the proposed method, each stiffener is made of two branches with the cut-out of fig. 1 or 4 and 5. Moreover, the cutting radius at the ends of the branches at a length / half 400 mm is Rm 2250-200 2050 mm. Bending is carried out on the ring

bending machine. After bending, a fully prepared AFi.-i semi-open finish is obtained: 1 finger. stiffeners without allowances for bending.

Claims (1)

Invention Formula A method of manufacturing bent blanks by cutting a blank with a curved shape of the end sections and then bending it to an edge, characterized in that, in order to save material and reduce labor intensity when cutting a blank with a curved shape of the end sections, the latter are performed with the same radius of curvature of the outer and inner contours equal to the radius of the finished product, while the length of the end sections is chosen equal to 0.6-2.5 height of the bent workpiece. under Schig.1 IG Phage.