JPS5838241B2 - Finishing universal rolling method for steel sheet piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a finishing universal rolling method for the purpose of improving the dimensional accuracy of finished product dimensions, particularly hole widths, in the finish bending rolling process of steel sheet piles.

In general, in the rolling of steel sheet piles, for example, in the rolling and shaping of straight steel sheet piles, as shown in Figure 1, grooves are carved on double or triple rolls, and one pass or several passes are sequentially performed for each hole. It is then passed through 11 to 13 hole-shaped rolls to form a gift.

That is, using the rough shaped steel piece shown in FIG. 2a or the bloomed steel piece shown in FIG. Bending is usually performed using K2 and Kl hole shapes.

However, machining with hole types K-2 and K-1 is
Since bending is performed by applying force from above and below and causing the rolled material to slide over the roll hole surface, it has the following practical disadvantages.

Since bending and rolling is performed by applying force only from above and below, the friction between the roll hole die and the rolled material varies due to differences in lubrication conditions, and due to fluctuations in frictional resistance, the center line length of the pawl portion changes. Due to rolling, where it is impossible to control the hole width by applying the tip of the toe to the roll hole die, a difference in the width of the left and right holes occurs due to the misalignment of the biting position.

This deviation in the biting position is usually corrected by guide adjustment, which takes time and causes many problems in terms of efficiency and quality stability.

In addition, a decrease in yield and processing costs due to deviations from product tolerances caused by variations in hole width are also a cause of high costs.

In order to eliminate these drawbacks, the present invention adopts the universal method for the final finishing hole type K-1, and controls the hole width by etching the tip of the bulb and claw with a vertical roll, thereby achieving high dimensional accuracy. The purpose of this invention is to provide a universal finishing rolling method for steel sheet piles that enables rolling of finished products.

The present invention will be specifically described below based on embodiments shown in the drawings.

In K-13 to K-21, rolling is performed by the same or other rolling method as the conventional method.

The rolling situation corresponding to K-3 is shown in FIG. 3, the rolling situation corresponding to K-2 is shown in FIG. 4, and the rolling situation corresponding to K-1 is shown in FIG.

Reference numerals 1 and 2.3 in each figure represent the products at each rolling stage.

K-1 is normally bent and rolled using only upper and lower horizontal rolls, but in the present invention, a universal rolling method is applied.

Moreover, the vertical roll 8 in this case has a flange part 9 on its body that protrudes between the horizontal rolls 6 and 7, as shown in FIG. However, the portion where the ball tip 5 and the claw tip 4 of the steel sheet pile come into contact has a hole width C exactly corresponding to the fitting gap required for the steel sheet pile.

That is, in other words, the major point of the vertical roll 8 is that it functions as a hole width regulation in the universal rolling.

Therefore, in actual rolling, K-13 to Kl are rolled by the same rolling method as in the conventional example or by other rolling methods, and the tip of the toe is edged with 8 vertical rolls to regulate the hole width.
The centerline length l1 of the K-3 claw part of the intermediate product 1 in FIG. 3 is designed to be longer than that in the conventional embodiment by the amount of etching of the tip of the claw by 8 vertical rolls.

Similarly, the center line length l2 of the K-2 claw of the intermediate precept 2 in Fig. 4
Similarly, the toe is designed to be longer than the conventional embodiment by the amount of edging of the toe.

Since the ball tip 5 and the toe 4 are in contact with the vertical roll 8 of the universal roll shown in FIG. 5, the hole width C has a constant value over the entire length of the steel sheet pile.

By applying the above rolling method, the dimensional accuracy of the hole width of the steel sheet pile joint can be greatly improved.

Incidentally, when comparing the method of the present invention and the conventional method regarding the hole width dimension, the hole width variation of the conventional method is σ = 1.3 mm, whereas the variation of the hole width of the method of the present invention is σ = 0. 5 mm, a remarkable improvement.

As described above, according to the present invention, rolling efficiency, yield, and quality can be significantly improved, but such effects are not limited to straight steel sheet piles, but also to hole width regulations for U-shaped and Z-shaped steel sheet piles. is also available, and its scope of application is extremely wide.

[Brief explanation of drawings]

Fig. 1 is a conventional rolling method for straight steel sheet piles, Fig. 2 is a front view showing rough shaped steel slabs a and bloom steel slabs b used in the rolling method shown in Fig. 1, and Fig. 3 corresponds to K-3. 4 shows a rolling situation corresponding to K-2, and FIG. 5 shows a rolling situation according to the present invention corresponding to K-1. 1...K-3 rolled material, 5...K-2 rolled material, 3...
・K-1 rolled material, 4... Toe of straight steel sheet pile, 5...
・Ball tip of straight steel sheet pile, 6... Universal mill upper water roll, 7... Universal mill lower water roll, 8... Universal mill left/right vertical roll.

Claims (1)

[Claims] 1. A flange corresponding to the hole width of the steel sheet pile joint in the horizontal roll is provided on the body of the vertical roll, and the finish rolling of the steel sheet pile is performed with the flange of the vertical roll and the tip and toe of the steel sheet pile joint in the horizontal roll in contact with each other. A finishing universal rolling method for steel sheet piles, which is characterized by universal rolling.