JPH03142044A - Production of rolled deformed bar - Google Patents

Abstract

PURPOSE:To efficiently produce high quality deformed bars having various sizes and strengths at low cost by making an interval and arranged angle of both rolls adjustable at the time of rolling the deformed bar by using a groove roll and a flat roll. CONSTITUTION:By assembling the groove roll 1 having a groove 6 projecting flanges 3 on both sides and the flat roll 2, a mold 12 is formed and the interval between the flat roll 2 and groove roll 1, is vertically shifted with oil pressure so as to be changeable. Further, both rolls 1, 2 are connected with a housing 5 rotatably through the shafts 4, and the flat roll 2 can be made to rotate the circumference of the groove roll 1 from right above position to right side position at 90 deg. angle. In this constitution, molten metal 10 is continuously poured into the groove 6 of the rotating groove roll 1 from a nozzle 8 in the tundish 7 and solidified in the mold 12 to cast the deformed shape 14 at rolling reduction point (c). Then, the ratio t/x of thickness (t) at the thick part and thickness (x) at the thin part in the mold 12 having a projected shape cross section can be optionally set by changing a rolls interval and an arranged angle of both rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing rolled deformed strips used for contacts, terminals, connectors, lead frames, etc. of electrical or electronic equipment.

[Conventional technology and its problems]

As the cross-sectional views of the irregularly shaped strips are shown in Figure 1 A to C, there are irregularly shaped stripes with one thick wall in the shape of a chevron (Figure A), irregular shaped strips with a double chevron shape (with the same opening), This is a strip with a shape such as a shaped strip (Figure C). Also, its dimensions are as shown in Figure 1A, where the thickness of the thick part is a, the thickness of the thin part is thick, and the width of the part is 20w + the total width of w is 40m-, and a = 1.0 to 3. ．． OmmSb −
The thickness ranges from 0.3 to 1.0 Llll, and the ratio a/b of thick and thin parts is 3.0 as shown in Table 1.
．． There are three main types: 4 and 0.50.

Table 1: The strength of irregularly shaped strips is usually 30 to 40 kgf/ in the case of pure copper.
- is used, and this is the strength obtained by processing a fully annealed material to reduce the area by 20 to 66%, as shown in the processing strengthening curve in Fig. 2.

In addition, deformed strips were manufactured by cutting or mill-rolling a flat plate, but the former involves a lot of material loss due to cutting, and the latter requires slow processing speed, both of which increase manufacturing costs. there were.

For this reason, it has been proposed to apply the twin-roll casting method, in which molten metal is injected between a pair of cooling rolls placed at a predetermined distance, solidified and rolled, to the production of irregularly shaped strips. It was done. According to this method, there is little material loss and high-speed manufacturing is possible, but it has the drawbacks of poor dimensional accuracy and low strength. Furthermore, this method is not suitable for producing small quantities of irregularly shaped strips of various sizes.

In other words, the twin roll casting method consists of a cooling roll (hereinafter abbreviated as "groove roll") 1 provided with grooves 6 and a flat surface, as shown in FIG. Each collar part 3 of the cooling roll (hereinafter abbreviated as flat roll) 2
．． In this manufacturing method, a mold 12 is formed in the gap between the pair of cooling rolls 13 which are placed in close contact with each other and fixed horizontally, and the molten metal 10 is injected into the entire mold 12 at once. According to this method, since the molten metal 10 is injected into the entire mold 12 at once, the obtained irregularly shaped strip 14 is of poor quality because solidification of thick parts is delayed, and the produced irregular shaped strip 14 is of poor quality. The cross-sectional shape of is limited to one type depending on the dimensions of the cooling roll used, and when manufacturing irregular strips with different cross-sectional shapes, it is necessary to replace the cooling roll with one of a different size, which reduces manufacturing costs. There were problems in that it was bulky and had poor productivity.

[Means and effects for solving the problem] The present invention was made as a result of intensive research in view of the above situation, and its purpose is to efficiently reduce high quality irregularly shaped strips of various sizes and strengths. Our goal is to provide a method for manufacturing products.

That is, the present invention provides a deformed strip having at least one thick wall portion in a thin wall portion, by injecting molten metal between a pair of cooling rolls,
This is cast by a twin-roll casting method in which it is solidified and rolled, and the cast deformed strip is rolled so that the thickness of the thick part is a,
In a method for manufacturing a rolled deformed strip having a predetermined dimension with a thin wall thickness b, the twin roll casting method is performed by providing at least one groove in one of the cooling rolls of the pair of cooling rolls, and A casting variant in which the interval and arrangement angle are variable, molten metal is injected into the grooves of a cooling roll having grooves, the injection position is variable, and further solidified and rolled between the pair of cooling rolls. Cool the pair so that the ratio t/X of the thickness L of the thick part and the thickness X of the thin part of the strip becomes the same as the ratio a/b of the thickness of the thick part and thin part of the rolled deformed strip. This method is characterized by adjusting the distance between the rolls and adjusting the arrangement angle of the pair of cooling rolls and/or the molten metal injection position so that the amount of solidification in the thick and thin parts is balanced.

In the method of the present invention, at least one groove is provided on the periphery of one of a pair of cooling rolls, molten metal is injected into a mold formed in the gap between the pair of cooling rolls, and the molten metal is solidified and rolled. At least, a method for manufacturing a deformed strip having at least one thick wall portion in a thin wall portion, wherein the dimensions of the thin wall portion of the deformed strip obtained by varying the interval between a pair of cooling rolls can be arbitrarily changed. In addition, the molten metal is injected through the grooves provided in the cooling roll to advance the solidification of the molten metal in the grooves that become the thick-walled parts, and the arrangement angle of the pair of cooling rolls and the injection position of the molten metal are controlled. By making the distance from the injection point of the molten metal to the rolling point variable, the amount of solidification of the molten metal passing through the groove can be arbitrarily advanced, thereby achieving high quality and reducing the thickness of the thick part. to the thickness X of the thin walled portion, t /
b is the ratio t/ of the thickness of the thick part and thin part of the cast deformed strip;
This is a method of rolling into rolled deformed strips equal to X.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the twin roll casting method of the present invention will be specifically described below with reference to the drawings.

FIG. 3A is a side view showing an example of an apparatus for carrying out the method of the present invention, and the opening in the figure is a cross section at rolling point C in FIG. In Figure A, numeral 5 is a tundish for injecting molten metal, and 5 is a housing for changing the arrangement angle of a pair of cooling rolls.

This device is composed of a grooved roll 1 and a flat roll 2,
Flanges 3 are provided protruding from both sides of the grooved roll 1, and these flanges 3 form a mold 12 in contact with the side surface of the flat roll 2, and serve to prevent molten metal from leaking. . Further, flanges 13 having a smaller diameter than the flat roll 2 are provided on both sides of the flat roll 2, but the flanges 13 serve only to reinforce the flat roll. The flat roll 2 can be moved up and down by hydraulic pressure so that the distance between it and the grooved roll can be changed freely, and the grooved roll 1 and the flat roll 2 are rotatably connected by a housing 5 via their shaft portion 4. The thousand rolls 2 are so designed that they can rotate 90' around the grooved rolls 1 from directly above them to directly beside them.

In order to produce a cast deformed strip, the outer periphery of the nozzle 8 at the tip of the tundish 7 is placed in the groove 6 above the groove roll 1 so as to be in slidable contact with the inner periphery of the groove 6. The molten metal 10 in 9 is supplied into the tundish dish 7 by adjusting the amount of molten metal 10 coming out with a stopper 11, and the molten metal 10 is passed from the nozzle 8 at the tip of the tundish dish 7 into the groove 6 of the rotating grooved roll 1. The molten metal IO is supplied through the groove 6 to the entire inside of the mold 12 formed by the grooved roll 1, the collar 3 on the outer periphery of the grooved roll, and the flat roll 2, and is solidified at the reduction point C. It is cast into a deformed strip 14 and wound around a coiler 15.

In the above, the ratio t/x of the thickness L of the thick part and the thickness X of the thin part of the mold 12 having a convex cross section formed by the groove roll l and the flat roll 2 is the ratio t/x of the thickness X of the thin part to the thickness X of the thin part. It can be set arbitrarily by changing the interval between the rolls 1.2. Further, the length of the groove 6 from the injection point a of the molten metal to the rolling point C can be arbitrarily set by rotating the housing 5 and changing the arrangement angle of the twin rolls, or by moving the injection point a. Can be done.

Defects such as cracks or bends that occur in cast deformed strips can be solved by increasing the distance between the injection point and the reduction point, that is, by increasing θ, or by moving the injection point away from the reduction point as the thickness X of the thin section decreases. This is prevented by balancing the solidification thickness. Furthermore, the above-mentioned cast deformed strip is manufactured into a rolled deformed strip with a thickness ratio of a/b between the thick part and the thin part by subjecting it to a rolling process such as groove rolling. Since the ratio a/b of the thickness of the thick part and the thin part is the same as the ratio t/x of the thickness of the thick part and thin part of the cast deformed strip, Therefore, high quality rolled deformed strips without cracks, bends, etc. are manufactured.

〔Example〕

The present invention will be explained in detail below using examples.

Example 1 A pure copper deformed strip was manufactured using the twin roll casting apparatus shown in FIG.

The groove roll 1 has an outer dimension of 300 m + φ x 80 il II 11
A groove 6 with a depth of 5.0 am and a width of 40III11 is formed on the peripheral edge at '.
, and one collar 3 of 352 ornamental diameter x 34.3 ma+' is attached on each side concentrically with the groove roll 1,
Also, the flat roll 2 has an outer dimension of 300fflIlφ×8orI
mw, 240naaφX34.5mm' tsuba 1 on both sides
3 are attached one by one concentrically with the flat roll 2, and the shape of the rolling point C of the mold 12 formed by bringing the collar 3 of the grooved roll 1 into contact with each side of the flat roll 2 is as follows. ,
As shown in the opening of FIG. 3, it has a convex cross-sectional shape with a crest of 50xm++L x 40mm' in the center of the thin part of xwa' x 80m'.

In the above, the thickness X of the thin portion can be arbitrarily set by changing the interval between the pair of cooling rolls.

In manufacturing pure copper deformed strips using such an apparatus, pure copper is melted in an electric furnace with a capacity of 500 kg and heated to 1150C, and then the molten copper 10 is tapped into the tandem dish 7 by operating the stopper 11. This molten copper 10 is passed through the nozzle 8 at the tip of the kundish 7 to the groove 6 of the groove roll 1.
The molten Mj4io is quantitatively injected into the mold 12 formed by the grooved roll 1, the grooved roll collar 3, and the flat roll 2, solidified, and rolled at the reduction point to form an irregular shape with a convex cross section. Article 14 was produced.

In the above process, the distance between the grooved roll 1 and the flat roll 2, that is, the thickness of the thin part, was changed to 2.50.1.68.1 mm, 32 mm, and t/x was changed to 3.0.4 mm, 0.4 mm. 5.0
Three types of cast deformed strips were cast according to the casting conditions shown in Table 2.

2. The three types of cast deformed strips obtained by surface removal were subjected to rough rolling and finish rolling with grooved rolls, with Ar
Intermediate annealing in an atmosphere was performed to produce rolled deformed strips having predetermined strength and dimensions.

In the above, the thickness of the rough-rolled material subjected to intermediate annealing was determined by calculating from the work strengthening curve of the annealed material shown in Figure 2 determined in advance so as to obtain the specified strength after finish rolling. . The results are shown in Table 3.

As is clear from Table 3, for each of the rolled deformed strips with a ratio a/b of the thickness of the thick part and thin part of 3.0.4.0.5.0, the strength of various dimensions is 30. or 40kgf/
A rolled deformed strip between the two was obtained.

〔effect〕

As described above, according to the method of the present invention, it is possible to efficiently produce rolled deformed strips having various shapes and strengths, and it has a significant industrial effect.

[Brief explanation of the drawing]

Figures 1A to 3C are cross-sectional views showing examples of deformed strips, Figure 2 is a view showing the processing strengthening curve of pure copper annealed material, and Figure 3A and 3B are side views showing an example of a device for carrying out the method of the present invention. and cross-sectional explanatory diagram,
FIG. 4A is a side and cross-sectional explanatory view of a device used in a conventional manufacturing method. l~groove roll, 2~flat roll, 3.13~tsuba, 4~shaft,
5 - housing, 6 - groove.

Claims (1)

[Claims] A deformed strip having at least one thick wall portion in a thin wall portion is cast by a twin roll casting method in which molten metal is injected between a pair of cooling rolls, solidified and rolled, and the cast deformed strip is cast. In a method for manufacturing a rolled deformed strip of predetermined dimensions, with a thick part having a thickness a and a thin part having a thickness b, the twin roll casting method is applied to at least one cooling roll of a pair of cooling rolls. one groove is provided, the interval and arrangement angle between the pair of cooling rolls are variable, the molten metal is injected into the groove of the cooling roll having grooves, and the injection position is variable; The thickness of the thick part and the thickness of the thin part of the cast deformed strip solidified and rolled between the cooling rolls of
The interval between the pair of cooling rolls is adjusted so that the ratio t/x of the thickness of the rolled deformed strip is the same as the ratio a/b of the thickness of the thick part and the thin part, and the amount of solidification of the thick part and the thin part is 1. A method for manufacturing a rolled deformed strip, the method comprising: adjusting the arrangement angle of a pair of cooling rolls and/or the molten metal injection position so as to maintain a balance between the two.