JPS61279415A - Inline cutting method for round sectional continuous cast piece - Google Patents

Abstract

PURPOSE:To improve an integrated yield rate, by press cutting round sectional continuous cast piece to be shorn through upper and bottom tools, which are divided into two parts forming a combined V-shaped section, and preventing the piece from generating a burr. CONSTITUTION:An upper tool 2 and a bottom tool 3, combining upstream side divided piece tools 2a and 3a respectively with downstream side divided piece tools 2b and 3b, are constituted into edge points of V-shaped section. A press machine performs press cutting by depressing the tools 2, 3 by pressure. Next the machine, releasing successively to said cutting the divided piece tools 2b and 3a from their restriction, continues depressing the paired divided piece tools 2a and 3b, and the machine, continuously shearing a cast piece 1 by the tools 2a and 3b, cuts the cast piece 1 with no generation of a burr.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-twin cutting method for round-section continuous cast pieces to be used as Fi and M zelkova rolled materials.

(Prior Art) Conventionally, gas cutting methods have been widely used for in-line cutting of round-section continuous cast pieces of rolled wire rod materials. Another press device! ! Inline FI# with Vc is also known.

(Problems to be Solved by the Invention) The gas cutting method of the prior art inevitably causes material loss during cutting ifr, which is a factor that reduces the overall yield. Particularly in the case of holding materials such as stainless steel, eliminating or reducing the material loss associated with cutting brings about a huge waste of time.

In-line cutting by a press device for this tl-!
, - At first glance, it seems to be effective from the viewpoint of yield without causing such material loss, but in reality, the press load required for cutting is large with the normal press cutting method, and Daikichi's press There are problems that require the installation of equipment.

Furthermore, in the case of round i-sided IIA casting H, unlike square cross-section continuous slabs such as billets and slabs, in normal press cutting, material deformation occurs near the cut surface, and the shape after cutting is true. deviates from the circle. In addition, cracks occur on the cut surface. These impair the surface quality of the final rolled product. On the other hand, if these inconveniences are corrected before rolling, the overall finish retention may be reduced.

The present invention relates to in-line cutting of round section continuous cast slabs, solves the problems of the prior art described above, and reduces the pressing force 1i1i:i required for cutting at the press of round section continuous cast slabs. Excellent! A. The purpose is to provide a method that reduces the cutting result to 47 tons and minimizes material loss due to cutting.

(90 Means 1 Effects and Examples for Solving Problems) The above object is 1 according to the present invention'), d Round cross section of rolled material 2! ! Divide each slab into two parts, one on the downstream side and one on the downstream side of the L trout cross section.
2) Indentation is performed on the upper and lower tools with a combined V cross-sectional shape, and at the same time, a pair of opposing parts of the separated upper and lower tools are continuously sheared using machine J4. This can reduce the required press load during pushing and shearing, prevent material loss due to cutting, and maintain good surface quality of the product after rolling.

Hereinafter, one method of the present invention will be specifically explained with reference to the accompanying drawings.

FIG. 1A) (→→→ indicates the order of cutting steps in the method of the present invention.

! Figures a & 1 ([Refer to [], the plate cut material is a round section slow cast piece (υ) of Kurabo rolled material, and moves in the direction of arrow (4) at a slow rate of 2 m/min or less. The cutting press machine also moves in the direction of arrow (4). The same shall be transferred.

The cutting tool consists of an earthwork A (2) and a lower tool (3), and the upper process (2) is attached to the upper tool rest of the press machine at the planned cutting plane (t) of continuous casting Pt (υ) and is divided into two parts. The one-piece tool (2 hatake) and the nine downstream side split-piece tool (2b) attached to the upper clamp are divided into two parts, and both are combined to form a v*'rm-shaped cutting edge.Similarly, the lower tool (3) is also 2 pieces. The upstream split piece A (5m) attached to the split lower clamp and the downstream split piece A (5b) attached to the lower tool rest are combined to form a V-section cutting edge shape.

In order to divide the round cross-section slow f11 piece (1) by the method of the present invention, press the combined upper and lower tools (2) and (3) into the press machine from the holding position shown in Figure 1 (A). Indentation processing is performed to form the L sea urchin shown in Figure 1 (b). Next, the split piece tools (2b) and (6a) are continuously held in the cell for one day. Shearing is performed to reach the cut as shown in .

Fig. 2 shows the shape of the cut end of continuous casting H (1) subjected to the indentation shear W process of the present invention. As can be seen from the shape of this stub, the occurrence of harmful burrs and deformation near the cut M plane can be minimized. It is sufficient to remove the ingot surface set a by performing the following steps.

This cut-and-cut machining can be easily performed by machining since the groove (b) remains flat after being cut by the V-shape machining machine AK. In addition, since press shearing is performed as the final step, no material loss occurs during shearing, and the overall yield is greatly improved compared to gas Fl shearing.

In the method of the present invention, in order to minimize the required braze imt, slow fJiptFI cutting is performed after shifting from pushing to shearing under conditions where the press load in the pushing stage and the press load in the shearing stage are equal. Figure 3 shows the rolling reduction ratio of the horizontal axis and the press load (P/Po) on the vertical axis.
1 The relationship between the two is that the indentation load of a flat blade with an R shape is the load M (Xl), and the approximate 90°vo metal is (X2
), Stray according to the present invention) In the case of 90v, the indentation load is expressed as load Ji (X3), and the shearing load is expressed as Wj (1) @cx5) (1). . In other words, it is possible to control the pressing force 1t so that the press loads of the two are equal from the relationship between the pressing force 1 by the shape tool, the pressing load and the shearing load, and the press load required for breaking the continuous slab is the minimum. Therefore, compared to the conventional press cutting load, Ffrllii deresuka i! can be reduced by approximately 40%.

(Effect of the invention) According to the fJJ4 of this invention, the following effects can be obtained.

(1) For in-line push shearing of round-section continuous casting materials using a V-shaped tool! QbtFJllrK essential breath ability is 5
Approximately 40% reduction compared to normal shear loads.

(1) There is no material loss due to cutting, and the overall volume is greatly improved compared to conventional gas cutting.

I'' Also, the shape of the 9th hole near the Fl location S is good, and the 5a
lpha surface care O Machining can be easily done, so the product surface quality of the pressed parts can be improved! ! , K111. held.

[Brief explanation of the drawing]

Figure 1 shows a double-sided view of the holding shape before the first stage of carrying out the method of the present invention, and Figure 1 (b) shows the indented shape of the first stage! ! A
C) @dKJ5gJ, Fig. 1 Tf→ is a plan view of the first Tf→ in the sheared state, and Fig. 2 is a plan view of the cut 1 of the slab cut by the method of the present invention. Figure 2 (B) is its side view, and Figure 2 (C) is its end view. Figure 5 is a chart showing the relationship between press weight on the vertical axis and rolling reduction rate on the horizontal axis. Round cut 1iiij round slab, (2) *・Top tool%
(3) Φ knuckle work A = (2a85a) - Upstream split piece tool, (2b) (sb) - Downstream split piece tool, (A) 11o slab advancing direction, [8] ''' Cutting & , (a)(b) ” ” EIIJW WB-(X
l) (X2) (X5 penalty...load 1 line.

Claims (2)

[Claims] (1) A round-section continuous piece of rolled wire rod material is pressed into two parts, one on the upstream side and one on the downstream side of the cut surface, using an upper and lower tool with a combined V cross-section, and then continuously separated. An in-line cutting method for round-section continuous slabs, characterized in that shearing is performed using a pair of upper and lower split-piece tools facing each other. (2) Pushing a round section continuously cast piece of wire rod rolled material using upper and lower tools with a combined V cross-section, which are divided into two on the upstream side and downstream side of the cut surface, and the separation of the upper and lower tools. In the in-line cutting process of round cross-section continuous slabs in which shearing is performed using a pair of split piece tools, under the condition that the press load at the pushing stage and the press load at the shearing stage are equal, the process shifts from pushing to shearing and continues. An in-line cutting method for round section continuous slabs, characterized by cutting the slabs.