SU1255230A1 - Method of deburring rolled stock billets - Google Patents

Description

1255230

The invention relates to rolling production and can be used in the finishing of billets of carbon and alloyed steels, intended for processing at the section rolling mills.

The aim of the invention is to reduce metal removal at the maximum removal of defects and increase the yield.

Figure 1 shows a blank with convex edges (cross section) and a defective layer that is untreated during stripping from the upper face; Fig. 2 shows the same, a blank with flat edges; 3 - blank with concave faces.

When removing surface defects using an abrasive blade or fire stripping from each face of the workpiece 1, the surface layer of metal 2 is removed, bounded by a line in the cross section that is richly located relative to the surface of the workpiece that passes through the center and the middle and crosses the face in points A and B, separated from the edges at a distance I of 1.0-2, OR, where R is the radius of rounding of the edges.

In the embodiment shown in FIG. 1 ,, section of the removable layer 2 is bounded on the lower side by a straight line segment AB. I.

For billet with flat edges

(i «r.2) the removable layer in ce4eHfra limits the curve, which in a particular case can be an arc of a circle,. Also the arc of a circle is the line bounding the section of the layer for the workpiece (Fig. 3). I

Choosing the distance I from the edges to

the points of intersection of the lower boundary of the layer being removed with the surface rpaim equal to 1.0 + 2, OR, are caused by the following considerations.

At 7 R, a layer of metal is removed, a significant part of which is free from defects, while partially removing the mefall from the rounded corners of the workpiece, which leads to a decrease in the yield. At I –2R, a part of the defects located near the ribs is not removed during the stripping, and when the billet is further rolled into the metal, defects appear that must be removed in the finished variety, which also reduces the yield of fine,

five

0

Approx. To test the proposed stripping method, 4 blanks per square 100 mm, length 4 m with a radius of rounding of the edges of 15 mm and an average weight of billets 318 kg were rolled from 4L5MFS steel ingots. Due to the specificity of rolling on the blooming, the two opposite faces of the blanks have a tightness with a deflection of about 2 mm, the other two faces are flat.

Blots rolled on the blooming are trimmed on abrasive grinding machines. After control, the first ten blanks were cleaned in a known manner by selective stripping at the locations of defects. The remaining fifty blanks are divided into 5 batches of 10 blanks each and are cleaned only in the middle of the faces over the entire length with different sizes: 0.6R (9 mm); 1, OR (15 mm); I, 6R (24 mm); 2R (30 mm) and 2.4R (36 mm), and the convex and flat edges are brushed separately with different machine settings. After rolling, each batch is weighed and the amount of scrap removed is determined. Peeled blanks are rolled on mill 250 for 520mm rods,

0 5 m long at the same heating temperature. In the rolling process, the process trim is selected and weighed, and it tends to ensure that the process trim is the same for all batches. Laminated rods to each batch are monitored for the presence of surface defects, defective rods are either, or are subjected to correction with the removal of defects, or are over, they are cut to a smaller size depending on the depth of the defects. After checking and finishing each batch of suitable bars are weighed, the value of

 waste after rolling and the total yield of steel dp batch.

The test results are shown in the table (the amount of waste is specified in terms of steel ton).

five

50

It follows from the table that when using the proposed method with the condition E and l30R there are no defects on the rolled bars, however, at 0.6R, the part of good methane, w 1a5 contained in the marginal zones of the layer being removed, reduces the yield of good.

3 12552304

If I 2R is removed, incomplete removal of the metal by the cleaning of the preform of the affected layer occurs more than by using a known layer, however, in this case, the results show that the volume decreases with a further 5higher yield of finished rods that, after the rolling of a billet, da rods sings in general, a greater yield of good, is emitted during the stripping of the billet in a known way.

When stripping with the parameters I remove the metal in the cleaned layer at

 The 2.4R yield is reduced in O {, OE, where R is the radius of the comparison with the known method, and the edges of the workpiece.

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there is

57.6 39.6

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Not

Not

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12.2

71.2

92.9

85.8 67.7

91.4 93.2

27

13.2 .7.2

28.3 28.4 28.2

Separate there are defects

3.1 12.4 12.5

there is

16.3 14.8 14.9

58.4 66.5 81.4

94.2 93.4 91.9

Editor G. Volkova

Compiled by O, Rum ntseva T (2hred L. Serdyukova

Order 4745 / 9Tire to 518Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Raushsk nab. 113035, Moscow

Production and printing company, Uzhgorod, st. Project, 4

fiyo.Z

Cor) rector A.Zimokosov

Claims (1)

METHOD FOR CLEANING LOGGING PROCESSES, including the removal of a surface layer of metal affected by defects, characterized in that, in order to reduce metal removal at the maximum removal of Defects and increase the yield, a metal layer is removed from each face of the workpieces, the cross section of which is limited on the lower side by a curved line, located symmetrically relative to the plane passing through the center and middle of the face of the workpiece and crossing the face at points spaced from the ribs at a distance equal to 1.0 + 2.0R, where R is the radius of curvature of the ribs. figure 1