JPH01138032A - Method and device for manufacturing deformed sectional bar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus and method for manufacturing a strip of irregular cross section in which portions having different thicknesses in the width direction are formed continuously in the longitudinal direction by a tentering rolling method. It is something.

[Conventional technology]

Currently, as shown in Fig. 2, there are no methods of rolling forming irregular cross-sectional strips (8) with different thicknesses in the width direction, such as a convex portion (10) formed on one side of the center section of the strip. , the axis of the rolling roll is arranged to face the longitudinal direction of the strip to be rolled, and the convex portion ( A concave groove corresponding to 10) is formed, and the strip to be rolled is intermittently supplied in the axial direction of the roll in the gap between the fixed lower die and the rolling roll, and the rolling surface other than the groove of the rolling roll and the fixed lower die are intermittently supplied. There is a method of rolling a rolled strip in the width direction to produce a strip of irregular cross section (8) shown in FIG.

There are actually two types of equipment for performing the above-mentioned rolling, depending on the shape of the fixed lower die.

First, a fixed lower mold (1
A rolling roll (3) having the above-mentioned groove (4) using 1a)
A method for manufacturing a strip of irregular cross-section by rolling the strip at right angles to the feeding direction of the strip to be rolled (1a) over a distance (Y) at least equal to the width (X) of the strip (1a); ), the rolling roll (3) is rolled into a strip to be rolled (1b) by using a fixed lower mold (llb) having a flat surface (6a) in the center and arcuate concave surfaces (6b) on both sides. The strip (1b) is reciprocated by rolling a distance (Z) less than the width (X) of the strip (1b) at right angles to the feeding direction of (2) and the arcuate concave surface (6b) of a fixed lower die (llb) to repeatedly press and roll to produce a strip of irregular cross section. Comparing the two, the latter has a shorter rolling distance, which allows the rolling rolls to roll at higher speeds, and enables the production of irregular cross-section strips with higher efficiency, so it has high industrial utility value.

[Problem that the invention seeks to solve]

In recent years, with the development of electronic and electrical equipment, there has been a demand for irregular cross-section strips with particularly excellent dimensional accuracy. It is well known that the thickness obtained during rolling is determined not by the geometric dimensions of the roll gap, but by the relationship between the so-called mill rigidity of the rolling mill and the rolling load, since the roll cap opens due to the rolling load. It is about.

The same applies to the above method, and the thickness distribution in the width direction of the material is obtained as the sum of the increases in the gap due to the rolling load at each rolling position. However, in order to obtain irregular cross-sectional strips with excellent dimensional accuracy, it is necessary to make the mill rigidity infinite by hydraulic control or to provide a geometric gap that takes into account the increase in roll gap due to rolling load. Conventionally, in order to adjust the amount of change in the gap, the shape of the rolling roll or the fixed lower mold was raised by the amount of change, or the combination of the curvatures of the circular arc portions of the rolling roll and the fixed lower mold was changed. However, if the material and dimensions of the material change, the amount of change in the gap due to the rolling load also changes, so there is a problem in that new rolling rolls and fixed lower molds must be manufactured each time.

[Means for solving problems]

The present invention was made in order to solve the above-mentioned problem, and has developed a method and apparatus that can efficiently manufacture irregular cross-sectional strips with excellent dimensional accuracy.

That is, in the manufacturing method of the present invention, a fixed lower mold having a flat central part and arcuate concave surfaces on both sides, and a rolling roll that reciprocates above the fixed lower mold are provided with a rolling part of the rolling roll. In a method of manufacturing irregular cross-sectional strips with different thicknesses in the width direction by supplying a strip in a direction perpendicular to the rolling direction and rolling the strip in the rolling direction of a rolling roll, rolling of a flat surface of a fixed lower mold is performed. The manufacturing apparatus of the present invention is characterized by rolling by changing the length and width in the direction, and the manufacturing apparatus of the present invention includes a fixed lower mold having a flat central part and arcuate concave surfaces on both sides, and the fixed lower mold. A rolling roll that reciprocates is provided above, and a strip is supplied into the gap between the fixed lower die and the rolling roll in a direction perpendicular to the rolling direction of the rolling roll, and the strip is fed in the rolling direction of the rolling roll. An apparatus for manufacturing irregular cross-sectional strips with different thicknesses in the width direction by rolling, characterized in that the central part of the fixed lower mold is divided into two parts in the rolling direction, and a spacer with a flat top surface is provided in the gap between them. It is.

[For production]

The reason why the length of the flat central part of the fixed lower die in the rolling direction is made variable is to arbitrarily adjust the amount of cap between the arcuate concave surface of the fixed lower die and the rolling surface of the rolling roll.

With this configuration, as mentioned above, the thickness dimension formed by tentering rolling is the same as the initial setting gap between the rolling roll and the fixed lower die, that is, the geometrically obtained gap during actual processing. The gap is obtained by adding the variation in the gap determined by the rolling load and the mill rigidity of the rolling mill, so if you know the variation in the gap due to the rolling load, you can create a geometric gap that takes this variation into account. can be given to the gap between the arc-shaped concave surface of the fixed lower mold and the rolling surface of the rolling roll, and the gap at each rolling position of the rolling roll is kept constant during processing, so that the irregular cross-section strip that is rolled is The dimensional accuracy of the thickness of both ends can be made excellent.

In this processing method, the rolling load on the strip to be rolled increases from the center of rolling of the rolling rolls toward both ends of the fixed lower die where the concave surface is formed, so the initial gap is set toward the ends. It should be set to be narrow.

In addition, in this apparatus, when the length of the flat part of the fixed lower mold in the rolling direction is lengthened, the above-mentioned gap widens, and when it is shortened, it becomes narrower.

This tendency becomes more pronounced toward both ends of the rolled strip in the width direction.

〔Example〕

Next, the present invention will be explained by examples.

When manufacturing the irregular cross-section strip (8) shown in FIG.
) has an axis (A) in the feeding direction of the strip to be rolled (1), as shown in Fig. 1, in order to roll only both ends without rolling. A concave groove (4) corresponding to the convex shape of the cross section of the irregular cross-section strip is formed on the lower surface of the rolling roll (3) having a rolling surface (2) of a circular arc curve.
A spacer (5) with a flat upper surface and a thickness f' shown by a broken line is formed below the rolling roll (3) (in the direction of the axis (A)).
) is connected to both sides of the spacer (5°), the upper surface of the connecting part side is a flat surface (6a), and the outer side is a simple arc-shaped concave surface (6a).
Copper strips and brass strips were rolled using an apparatus equipped with a divided fixed lower mold (7H7) formed with 6b). At this time, the rolling surface (2) of the rolling roll (3) and the concave surface (
Calculate the amount of change in the gap in step 6b), change the initial gap by the amount of change, and set the rolling roll (3) and the split fixed lower mold (7) to the initial gap m (d) that matches these copper strips and brass strips. ) and the concave surface (6b) was set. This adjustment of the gap was carried out by using a spacer (5) having a different thickness from the original spacer (5'), that is, by changing the thickness of the spacer (from 1' to l).

Under these conditions, copper strips and brass strips were fed in the axial direction of the rolling rolls (3) and rolled for tentering, and the irregular cross-section strips (8) shown in Fig. 2 were continuously manufactured, and the results were good. A product with excellent dimensional accuracy was obtained.

In addition, due to changes in the length of the flat part of the assembled fixed lower mold (9) including the thickness of the spacer (changed from L' to 1 in Figure 1), rolling from the rolling center of the rolling roll (3) 50 in the direction
．． The position showed a change in thickness of about 1720 times the change in length.

〔Effect of the invention〕

As described above, according to the present invention, the roll gap cannot actually be directly detected using the method of increasing the mill rigidity to infinity using hydraulic control as described above as a method for improving dimensional accuracy. The industrial limit is about twice that. Although this level of improvement is possible, the hydraulic control system becomes quite expensive. In addition, in the method of changing the shape of the circular arc part of the rolling roll or fixed lower die, each must be manufactured depending on the material of the material and the size of the product.
Although it is cheaper than the above hydraulic type, it is more expensive. -6 According to the present invention, a set of rolling rolls, a fixed lower mold of the split mold, and a plate (i.e., a spacer) inserted between the fixed lower mold of the split mold
By preparing several sheets and using them in combination, the length of the flat portion can be varied over a wide range.

Therefore, it has the advantage of being cheaper and can be used over a wide range, and has significant industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a modified cross-sectional strip, and FIGS. 3(A) and 3(B) are front views showing a conventional example. 1, la, lb...Rolled strip 2...Rolling surface 3...Rolling roll 4...Concave groove 5.5°...Spacer 6a...Flat surface 6b...Concave surface 7 ...Divided fixed lower mold 8...Irregular cross-section strip 9...Assembled fixed lower mold 10...Convex portions 11a, llb...Fixed lower mold A...Axis line

Claims (2)

[Claims] (1) A fixed lower mold having a flat central part and arcuate concave surfaces on both sides, and a rolling roll that reciprocates above the fixed lower mold, with a gap perpendicular to the rolling direction of the rolling roll. In a method of manufacturing irregular cross-sectional strips with different thicknesses in the width direction by supplying a strip in the rolling direction of a rolling roll and rolling the strip in the rolling direction of a rolling roll, the length of the flat surface of the fixed lower mold in the rolling direction 1. A method for manufacturing a strip of irregular cross-section, characterized by rolling the strip while changing the . (2) A fixed lower mold with a flat central part and arc-shaped concave surfaces on both sides, and a rolling roll that reciprocates above the fixed lower mold are installed, and the rolling roll is placed in the gap between the fixed lower mold and the rolling rolls. In an apparatus that supplies strips in a direction perpendicular to the rolling direction of the rolls and rolls the strips in the rolling direction of the rolling rolls to produce irregular cross-section strips with different thicknesses in the width direction, a fixed lower mold is used. 1. An apparatus for producing irregular cross-section strips, characterized in that the central portion is divided into two in the rolling direction, and a spacer with a flat top surface is provided in the gap between the two.